JP2022169752A - Fire alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm device in which screws for fixing a mounting plate do not influence a machine main body.

SOLUTION: An alarm device having a mounting surface (a mounting base 501) facing an installation surface 5900 of an installation object, includes: housing means (a casing 502) for housing detection means (a detection unit cover 503, a detection space 534, a part of a detection part main body 504, a light emission unit 552, and a light reception unit 553) for detecting smoke contained in gas; and a first inflow open 523 to inside of which gas is made to flow. The detection means detects smoke contained in gas that has flown into the detection space 534 defined by partitioning of the outer side as a first inflow opening side with a second inflow opening. A dimension in a direction substantially orthogonal to the mounting surface in the first inflow opening is smaller than that in the direction substantially orthogonal to the mounting surface in the second inflow opening. Guiding means (a back casing 521) is provided that makes gas from outside flow into the detection space substantially along the direction of the mounting surface sequentially through the first and second inflow openings by using an internal space within the casing as a channel.

SELECTED DRAWING: Figure 33

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to an equipment mounting structure and its mounting plate to be mounted on the wall surface or ceiling surface of a building, an alarm for detecting an abnormality such as a fire and issuing an alarm, a fire alarm, an alarm device, and a method for manufacturing the same.

This application is Japanese Patent Application No. 2015-211508 filed on October 28, 2015, Japanese Patent Application No. 2015-224619 filed on November 17, 2015, November 2015 Japanese Patent Application No. 2015-215527 filed on December 2, 2015, Japanese Patent Application No. 2015-234562 filed on December 1, 2015, and Japanese Patent Application filed on April 22, 2016 which claims the benefit of Japanese Patent Application No. 2016-086052, which is incorporated herein by reference in its entirety.

2. Description of the Related Art In equipment to be installed on a building surface such as a wall surface or a ceiling surface, the equipment body may be fixed by a mounting plate. Such devices include, for example, fire alarms and gas alarms. A fire alarm uses a sensor to detect smoke, heat, or flame caused by a fire, and issues an alarm by sound, light, or the like when a fire is detected.

One surface of the mounting plate abuts against the installation surface of the building and serves as a surface to be fixed, and the other surface serves as a surface to which the device body can be fixed. When attaching the device body to the installation surface, first, the mounting plate is screwed and fixed to the installation surface, and the device body is attached and fixed to the fixed mounting plate. As a device mounting structure composed of a mounting plate and a device body, for example, there is a structure as described in Patent Document 1.

A speaker for emitting sound is provided in the housing of the fire alarm. The speaker will issue an alarm when a fire is detected. The speaker is fixed in the housing, and an acoustic hole is formed in the front part of the housing at a position facing the speaker. Sound from the speaker is propagated to the front side of the housing through the acoustic holes. As such a fire alarm, for example, there is one as described in Patent Document 2.

For fire alarms that are mainly installed in homes, the main front panel of the housing is designed to facilitate operations such as turning on the power for the first time, periodic operation tests, and stopping the alarm when an alarm is triggered. An operating button is provided. By pressing the operation button, the push button switch inside the fire alarm can be pressed and various operations can be performed. Further, the operation button may be provided with an attachment portion for a drawstring. When the fire alarm is installed at a high place, the operation button can be operated by attaching a pull cord to the operation button and pulling the pull cord. As a fire alarm equipped with such an operation button, there is, for example, one disclosed in Patent Document 3.

A fire alarm is installed on an installation surface such as a wall surface or a ceiling surface of a building, detects smoke caused by a fire with a sensor unit, and issues an alarm by sound or light when a fire is detected. Smoke detection in a fire alarm is performed by a smoke detecting section having a light-emitting section and a light-receiving section. The light receiving section is arranged in the smoke detection section so that the light from the light emitting section is not directly incident thereon. When smoke enters the smoke detection section, part of the light from the light emitting section is scattered by the smoke, and the presence of smoke can be detected by receiving this scattered light at the light receiving section. Since the smoke detector detects smoke based on the principle described above, it is necessary to prevent light from entering the smoke detector from the outside. Therefore, a smoke detector cover is provided to cover the area of the smoke detector. The smoke detector cover is provided with a plurality of wall portions rising from the base along the circumferential direction. This wall portion shields light from the outside and prevents it from entering the light receiving portion. As a fire alarm device having such a smoke detector cover, there is, for example, one disclosed in Patent Document 4.

Further, conventionally, a photoelectric smoke detector has been proposed that is installed on the installation surface of a monitoring area and detects smoke in the monitoring area to issue an alarm (for example, Patent Document 5). Such a conventional photoelectric smoke sensor generally includes a light emitting element, a light receiving element, a light receiving lens, a detection unit body, and a smoke detection unit, and is separated from the light emitting element by the detection unit main body and the smoke detection unit. The light-receiving lens collects the scattered light in the smoke detection part based on the light emitted into the detection space, and the light-receiving element receives the collected light. It detected the smoke that flowed into the reactor and issued an alarm. Here, when assembling such a photoelectric smoke sensor, first, the light-emitting element and the light-receiving element are attached to the mounting mechanism provided in the main body of the detection part (such as a hole having a shape corresponding to the light-emitting element and the light-receiving element). ) to fix the optical axis of the light emitting element and the light receiving element.In this state, after inserting the connection wire (leg) of the light emitting element and the light receiving element into the through hole of the board, solder the connection line to the board. and implemented.

JP 2007-47896 A JP 2012-14742 A JP 2007-122414 A JP 2011-248545 A JP 2010-39935 A

When the mounting plate is screwed to the installation surface, the screw heads are exposed on the front side of the mounting plate, that is, on the mounting side of the device body. When the device body is attached to the mounting plate, if the head of the screw hits the device body, the device body may be damaged. For example, in a device body in which a battery is mounted, the battery may be damaged by the head of a screw colliding with the battery. In addition to this, there is a possibility that the head of the screw may damage the wiring or the like of the device body. In particular, when the device body is made thinner, there is less space in the device body, so the screw heads exposed from the mounting plate are more likely to affect the device body.

A fire alarm is required to have a sound level of a predetermined level or higher from a speaker. That is, although the sound pressure of the speaker must be above a predetermined level, the diameter of the speaker that can be mounted is limited due to the miniaturization of the housing. Therefore, it is desired to increase the sound pressure while keeping the diameter of the speaker as it is.

In order to facilitate operation of the operation button, it is desirable to increase the size of the operation button. However, if the operation button is enlarged, the structure for the pressing operation and the return operation to the original position becomes complicated, the number of parts of the operation button increases, or the shape of the operation button itself becomes complicated. was becoming Due to the complicated structure of the operation button, variation in the pressing operation due to part tolerance may occur.

Downsizing is required for fire alarms. Since the wall of the smoke detector cover is formed to have a substantially V-shaped cross section in order to improve the light shielding property, the size in the radial direction is relatively large, which is a factor hindering the downsizing of the fire alarm. rice field.
In addition, the fire alarm is provided with a speaker for issuing a sound, and if this speaker overlaps the smoke detector cover in the thickness direction of the housing, sufficient sound pressure cannot be obtained from the speaker. Since there is a possibility that they may disappear, it is necessary to arrange them so that they do not overlap. As fire alarms have been miniaturized and housings have become smaller, it has become difficult to arrange them so that they do not overlap.

However, in the mounting method as described above, since it is necessary to insert the connecting wires of the light emitting element and the light receiving element into the through holes of the substrate at the same time, the insertion work is difficult, and the mounting of the light emitting element and the light receiving element is troublesome. was required. Moreover, since a mounting mechanism for attaching the light-emitting element and the light-receiving element to the detection unit main body is required, the mechanism of the detection unit main body becomes complicated, which is not preferable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device mounting structure and a mounting plate capable of preventing the screws for fixing the mounting plate from affecting the device body.
Further, the present invention has been made in view of the above-mentioned problems, and provides an alarm device that can increase the sound pressure of a speaker installed in a housing, save space for installing the speaker, and can be securely fixed. intended to
Another object of the present invention is to provide an alarm device which has a simple structure and can perform a pressing operation and a returning operation to the original position without variation.
Another object of the present invention is to provide a fire alarm in which the smoke detection section is miniaturized and the smoke detection section cover can be arranged so as not to overlap the speaker or the like in the housing. and
In addition, the present invention has been made in view of the above problems, and can simplify the mounting work of the detection means (corresponding to the light emitting element and the light receiving element), and the mechanism of the covering means (corresponding to the main body of the detection part). It is an object of the present invention to provide an alarm device and a manufacturing method thereof that can simplify the

In order to solve the above problems, the alarm device according to claim 1 is an alarm device that is attached to an installation surface of an installation object, has a mounting surface that faces the installation surface, and is contained in gas. a detection means for detecting smoke that is being emitted; and an accommodation means for accommodating the detection means, wherein the accommodation means is a first inflow opening extending in a direction along the mounting surface, a first inlet opening for allowing the gas to flow into the interior of the containment means, the detection means having a detection space and adapted to detect the smoke present in the detection space; A distance from the mounting surface to the detection space along a direction orthogonal to the mounting surface, and the distance to the farthest point from the mounting surface in the detection space is the distance from the mounting surface. The distance from the mounting surface to the first inflow opening along the direction perpendicular to the mounting surface is set to be shorter than the distance to the closest point of the first inflow opening to the mounting surface. The detection space is provided closer to the mounting surface than the first inflow opening so that no part of the detection space is located in the first inflow opening.

It is the perspective view seen from the front side of the fire alarm of this Embodiment 1. FIG. It is the perspective view seen from the back side of the fire alarm. It is a rear view of an alarm main body. It is a front view of a mounting plate. It is a perspective view of a screw and a mounting plate that are tightened to the installation surface. It is a longitudinal section of a fire alarm. FIG. 10 is a front view of the fire alarm in Embodiment 2-1; FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7; FIG. 8 is a cross-sectional view taken along the line BB of FIG. 7; It is a front view of a board|substrate part. It is a front view of the board|substrate part which attached the speaker. FIG. 12 is a cross-sectional view taken along the line AA of FIG. 11; FIG. 10 is a front view of a substrate portion used in the fire alarm of Embodiment 2-2; FIG. 11 is a front view of a substrate portion used in the fire alarm of Embodiment 2-3; It is a front view of the fire alarm in this Embodiment 3. FIG. FIG. 16 is a cross-sectional view taken along line AA of FIG. 15; It is a front view of an operation button. It is a side view of an operation button. FIG. 18 is a cross-sectional view taken along line AA of FIG. 17; It is the perspective view which looked at the operation button from the back side. It is a perspective view from the back side of a fire alarm. FIG. 22 is an enlarged view of the vicinity of the rear extension portion in FIG. 21; 16 is an enlarged view of the lower part of the housing in the BB section of FIG. 15. FIG. 17 is an enlarged cross-sectional view of the lower part of the housing when the operation button is pressed from the state of FIG. 16; FIG. It is the perspective view seen from the front side of the fire alarm in this Embodiment 4. FIG. It is a longitudinal section of a fire alarm. FIG. 10 is a perspective view of a substrate portion having a smoke detection portion; It is a cross-sectional view showing the inside of the smoke detector. 29 is an enlarged view of a range in which the detection position of the sensor part and the light shielding wall part directly face each other in FIG. 28; FIG. FIG. 11 is a perspective view of an alarm device according to Embodiment 5; It is a bottom view of an alarm device. It is a side view of an alarm device. FIG. 32 is a cross-sectional view taken along line AA of FIG. 31; It is an exploded perspective view of the alarm device seen from below. It is an exploded perspective view of the alarm device seen from above. It is a bottom view of a mounting base. 4 is a plan view of the mounting base; FIG. It is a bottom view of a back case. It is a top view of a back case. It is a front view of a back case. It is a top view of a front case. It is a front view of a front case. It is a bottom view of a detection part cover. FIG. 4 is a front view of the detection unit cover with the insect screen omitted; It is a bottom view of a detection part main body. It is a top view of a detection part main body. It is a front view of a detection part main body. It is a bottom view of a circuit part. It is a top view of a circuit part. It is a front view of a circuit part. It is an expansion perspective view of a detection part main body. FIG. 33 is a cross-sectional view taken along line BB of FIG. 32; FIG. 53 is a cross-sectional view taken along line CC of FIG. 52; It is a perspective view of a circuit board. It is a sectional view showing a circuit board and a jig for mounting. It is a perspective view which shows the jig|tool for mounting of an initial state. FIG. 3 is a perspective view showing a mounting jig in which a light emitting section, a light receiving section, and a shield are arranged; FIG. 3 is a perspective view showing a mounting jig on which a circuit board is placed; It is a perspective view which shows the jig|tool for mounting which made the upper cover closed.

[Embodiment 1]
Embodiment 1 of the present invention will be described in detail with reference to the drawings. In the first embodiment, it is assumed that the device attached to the installation surface is a fire alarm. FIG. 1 shows a perspective view of the fire alarm device in Embodiment 1 as seen from the front side, and FIG. 2 shows a perspective view of the fire alarm device as seen from the rear side. The fire alarm of Embodiment 1 has an alarm main body 1 that detects the occurrence of a fire and issues an alarm, and a mounting plate 2 that mounts the alarm main body 1 on an installation surface.

The alarm main body 1 has a housing 10 having therein a sensor for detecting smoke and the like. The housing 10 has a smoke inlet 12 on its side surface, through which smoke is introduced into the housing 10 and detected by a sensor.

The housing 10 has a front surface 11 facing the inside of the room. The front surface 11 has operation buttons 13 for performing various operations and an acoustic hole for emitting sound from a speaker provided inside the housing 10. 14 are provided.

The mounting plate 2 is provided on the rear side of the alarm body 1 and can fix the alarm body 1 . The installation surface to which the mounting plate 2 is fixed is the wall surface of the house in the first embodiment. After the mounting plate 2 is fixed to the vertical installation surface, the alarm main body 1 is attached and fixed to the mounting plate 2 .

The mounting plate 2 has an alarm fixing surface portion 20 formed in a substantially ring shape with a hole in the center. An upper projecting portion 21 is formed at the upper end portion of the alarm fixing surface portion 20 . The upper projecting portion 21 is used when there is a place to be hooked on the installation surface in advance, but is not used in the first embodiment. A groove-like notch is formed in the base portion of the upper projecting portion 21, and when the upper projecting portion 21 is not used, it can be easily broken off and removed.

FIG. 3 shows a rear view of the alarm main body 1. As shown in FIG. A battery housing portion 16 is formed in the upper portion of the back surface of the alarm body 1, and a battery 17 is housed therein. The battery housing portion 16 is formed in a recessed shape that opens to the rear side, and the opening is not covered with a lid. As a result, the housing 10 is thinned by the thickness of the lid. Mounting plate fixing portions 15 are formed at three positions in the circumferential direction on the rear surface of the alarm body 1 . The mounting plate fixing portion 15 is formed so as to be rotationally locked to the mounting plate 2 .

The structure of the mounting plate 2 will be explained in more detail. FIG. 4 shows a front view of the mounting plate 2. As shown in FIG. The alarm device fixing surface portion 20 of the mounting plate 2 is formed with claw-like locking pieces 24 at three locations along the circumferential direction. The locking piece portion 24 is formed at a position corresponding to the mounting plate fixing portion 15 formed on the back portion of the alarm main body 1, and can be rotationally locked.

Further, the alarm device fixing surface portion 20 is provided with a plurality of screw hole portions 22 through which screws for fixing the mounting plate 2 to the installation surface can be inserted. In the first embodiment, of the plurality of screw holes 22, the screw hole 22 located in the upper 12 o'clock direction is used, so this screw hole 22 will be described below.

The screw hole portion 22 has a large diameter at the lower portion and a small diameter at the upper portion, and has a gourd-like shape in which these are continuous. A rising portion 23 rising from the alarm fixing surface portion 20 is formed around the screw hole portion 22 so as to surround the screw hole portion 22 . The rising portion 23 is formed to have a substantially elliptical shape when viewed from the front.

FIG. 5 shows a perspective view of the screws 30 and the mounting plate 2 that are tightened to the installation surface. The screw 30 is pre-tightened to a certain position with respect to the installation surface. At this time, the head 31 of the screw 30 is floating from the installation surface.

The screw hole portion 22 of the mounting plate 2 is formed to have a diameter that allows the head portion 31 of the screw 30 to be inserted through the large-diameter lower portion thereof. Therefore, the screw 30 can be inserted through the lower portion of the screw hole portion 22 and the screw 30 can be passed through the front side of the mounting plate 2 . By sliding the mounting plate 2 downward from this state, the screw 30 is positioned at the small diameter portion above the screw hole portion 22 . Since the small diameter portion of the screw hole portion 22 is larger than the diameter of the screw 30 and smaller than the diameter of the head portion 31, the screw 30 can be further tightened by positioning the screw 30 in the small diameter portion of the screw hole portion 22. As a result, the head 31 of the screw 30 can be brought into pressure contact with the peripheral edge of the screw hole 22 , and the mounting plate 2 can be fixed to the installation surface by the screw 30 .

At this time, the screw 30 is tightened to a position where the head 31 of the screw 30 does not protrude beyond the surrounding rising portion 23 . That is, the screw 30 is tightened until the head portion 31 is completely hidden by the rising portion 23 when the mounting plate 2 is viewed from the side. In this way, the rising portion 23 can also be used as a guide for how deep the screw 30 is to be tightened.

FIG. 6 shows a longitudinal sectional view of the fire alarm. A screw 30 is also shown in this figure. When the mounting plate 2 is fixed to the installation surface with the screw 30 , the head 31 of the screw 30 does not exceed the height of the rising portion 23 formed around the screw hole portion 22 . That is, the height of the rising portion 23 is set so that the head portion 31 of the screw 30 does not protrude further toward the front side than the rising portion 23 .

A screw hole 22 for fixing the screw 30 is positioned above the mounting plate 2, and the battery 17 accommodated in the battery compartment 16 of the alarm body 1 and the head 31 of the screw 30 face each other. Here, around the head 31 of the screw 30 is formed a rising portion 23 having a height that does not allow the head 31 to protrude, so that the battery 17 does not come into contact with the head 31 of the screw 30. can be made That is, the head 31 of the screw 30 exposed from the mounting plate 2 to the front side can be prevented from affecting the alarm body 1 .

Although the first embodiment of the present invention has been described above, the application of the present invention is not limited to the first embodiment, and can be applied in various ways within the scope of its technical ideas. For example, in Embodiment 1, the height of the rising portion 23 is approximately the same as the projection height of the head portion 31 of the screw 30, but the rising portion 23 may be higher than the projection height of the head portion 31. , may be formed higher to the extent that it does not interfere with the alarm body 1 . Further, the positions and the number of the screw holes 22 and the rising portions 23 are not limited to those of the first embodiment, and can be appropriately arranged as necessary. Furthermore, although the installation surface is a wall surface in the first embodiment, it may be a ceiling surface. Also, although the device is a fire alarm in the first embodiment, it may be another type of device such as a gas alarm.

[Embodiment 2]
Next, embodiments 2-1 to 2-3 of the present invention will be described in detail with reference to the drawings. Embodiments 2-1 to 2-3 will be described assuming that the alarm is a fire alarm. FIG. 7 shows a front view of the fire alarm in Embodiment 2-1. The fire alarm device of Embodiment 2-1 has an alarm body 201 that detects the occurrence of a fire and issues an alarm.

The alarm main body 201 has a housing 210 having a sensor for detecting smoke and the like inside. The housing 210 has a smoke inlet on a side surface, through which smoke is introduced into the housing 210 and detected by an internal sensor.

The housing 210 has a front portion 211 facing the room side, and the front portion 211 has operation buttons 214 for performing various operations and a speaker 217 provided inside the housing 210 for emitting sound. of acoustic holes 215 are provided.

FIG. 8 shows a cross-sectional view taken along line AA of FIG. A battery housing portion 218 is formed in the upper portion of the rear surface of the alarm main body 201, and a battery 219 is housed therein. The battery housing portion 218 is formed in a concave shape that opens to the rear side, and the opening is not covered. As a result, the housing 210 is thinned by the thickness of the lid.

A substrate portion 216 is disposed inside the housing 210, and the substrate portion 216 is provided with a smoke detection portion 216a for detecting smoke flowing in from the smoke inlet. Although not shown in FIG. 8, a speaker 217 is attached and fixed to the substrate portion 216 .

FIG. 9 shows a cross-sectional view taken along line BB of FIG. As shown in this figure, in the hollow portion formed inside the housing 210, the substrate portion 216 is arranged at a substantially central position in the thickness direction, and the front surface 217a of the speaker 217 fixed to the substrate portion 216 is an acoustic hole. 215. A space is formed between the substrate portion 216 and the rear surface portion 212 of the housing 210 on the rear surface side of the substrate portion 216 . A region of the rear surface portion 212 of the housing 210 that forms this space portion does not have a hole or the like and is closed.

FIG. 10 shows a front view of the substrate portion 216. As shown in FIG. As shown in this figure, the substrate part 216 has a substantially circular shape with a part missing, and a sensor 216b for detecting smoke is arranged in the central part. A speaker fixing portion 220 is formed on the periphery of the substrate portion 216, and the speaker 217 is fixed here.

The speaker fixing portion 220 has a substantially circular rising portion 221 with a part missing, and the speaker 217 can be arranged inside the rising portion 221 . The inside of the rising portion 221 serves as a base surface portion 222 that constitutes a part of the substrate portion 216 and faces the rear surface of the speaker 2217 . A through portion 226 consisting of a plurality of small holes is formed in the base surface portion 222 .

A substantially T-shaped fixing locking piece 223 is provided on one side of the speaker fixing portion 220 . The fixed locking piece portion 223 is integral with the base plate portion 216 and cannot move relative to the base plate portion 216 . A moving locking piece portion 224 that can move in a predetermined direction with respect to the base plate portion 216 is provided on one side of the speaker fixing portion 220 facing the fixed locking piece portion 223 . The fixed locking piece portion 223 and the moving locking piece portion 224 are arranged so as to face each other in the diameter direction of the speaker 217 fixed to the speaker fixing portion 2220 .

The movable locking piece portion 224 is formed at the tip of an elastic piece 225 that is cantilevered on the base plate portion 216 . The elastic piece 225 is cantilevered on the outer peripheral portion of the base portion 222 , so that the elastic piece 225 can be elastically deformed in the thickness direction of the substrate portion 216 . Thereby, the moving locking piece portion 224 can move in the thickness direction with respect to the base plate portion 216 .

11 shows a front view of the substrate portion 216 to which the speaker 217 is attached, and FIG. 12 shows a cross-sectional view taken along line AA of FIG. 11. As shown in FIG. The speaker 217 has a speaker body 217c having a substantially circular shape, and has a pair of ears 217d that are diametrically opposed to each other on the outer circumference of the speaker body 217c. An engaging concave portion 217e for engaging the fixed engaging piece portion 223 or the moving engaging piece portion 224 is formed in the ear portion 217d.

When attaching the speaker 217 to the speaker fixing portion 220, first, with one ear portion 217d side floating from the base surface portion 222, the locking recess 217e formed in the other ear portion 217d of the speaker 217 is fixed. The locking piece 223 is locked. Thereafter, when one ear portion 217d is pressed against the moving locking piece portion 224, the elastic piece 225 is elastically deformed, and the moving locking piece portion 224 is locked to the other ear portion 217d. As a result, the speaker 217 is locked to the speaker fixing portion 220 at two diametrically opposed locations, and the speaker 217 can be stably held on the substrate portion 216 .

Since the speaker 217 is elastically locked and fixed to the substrate portion 216 at the ear portions 217d opposed in the diametrical direction, it is possible to suppress changes in the fixed state of the speaker 217 due to environmental changes such as temperature and humidity. be able to. Further, the speaker 217 is locked and fixed so as to be sandwiched between the fixed locking piece portion 223 and the moving locking piece portion 224, and the locking position is an ear portion 217d formed protruding from the outer circumference of the speaker 217. Therefore, deformation of the speaker main body 217c can be prevented, and reduction in sound pressure can be prevented.

As shown in FIG. 9 , the speaker 217 has a front surface 217 a that vibrates and emits sound facing the front side of the substrate portion 216 , and a back surface portion 217 b that faces the base surface portion 222 . Since a small hole-shaped through portion 226 is formed in the base surface portion 222 , the rear surface 217 b of the speaker 217 is formed between the substrate portion 216 and the rear surface portion 212 of the housing 210 via the through portion 226 . facing the open space.

When the speaker 217 emits sound, the front 217a side vibrates to generate sound, which is propagated to the outside through the acoustic holes 215 of the housing 210. FIG. On the other hand, the vibration on the front surface 217a side of the speaker 217 spreads to the entire speaker 217, so that the sound is transmitted to the rear surface 217b side of the speaker 217 as well. The sound resonates in the space on the rear surface portion 212 side of the housing 210 through the through portion 226 formed in the base surface portion 222 and propagates to the outside.

The effect of sound resonance on the rear surface 217b side of the speaker 217 varies depending on the diameter of the speaker 217, the volume and shape of the space on the rear surface portion 212 side of the housing 210, the area of the through portion 226, and the like. In Embodiment 2-1, since the through portion 226 is formed of a plurality of small holes, the area of the through portion 226 can be adjusted so as to maximize the effect of resonance.

Specifically, many small holes are formed in the base surface portion 222 in advance, and in a state in which all parts of the fire alarm are assembled, sound is emitted from the speaker 217 and the sound pressure is measured. Next, a part of the small hole formed in the base surface portion 222 is closed with resin or the like, and sound is emitted from the speaker 217 again to measure the sound pressure. By repeating this, the number of small holes with the highest sound pressure is set as the number of small holes in the actual product. When manufacturing an actual product, a step of blocking some of the pre-formed small holes in the substrate portion 216 is added so that the set number of small holes is obtained. This makes it possible to manufacture a fire alarm in which the sound pressure from the speaker 217 is maximized. The number of small holes may be adjusted individually or may be set for each production lot. Alternatively, the through portions 226 may be formed by the same number of small holes without performing this adjustment.

In this way, the through portion 226 communicating with the space formed between the substrate portion 216 and the rear surface portion 212 of the housing 210 is formed in the base surface portion 222 facing the rear surface portion 217b of the speaker 217. The sound pressure from 217 can be increased. That is, even if the diameter of the speaker 217 is made small, a predetermined sound pressure can be achieved, so that the size of the housing 210 can be reduced.

In addition, since the penetrating portion 226 is formed of a plurality of small holes, the sound pressure of the speaker 217 can be maximized by adjusting the number of small holes. Insects and the like can also be prevented from entering the portion 216a.

Next, Embodiment 2-2 of the present invention will be described. FIG. 13 shows a front view of the substrate portion 230 used in the fire alarm of Embodiment 2-2. Since Embodiment 2-2 is the same as Embodiment 2-1 except for the speaker fixing portion 231 provided on the substrate portion 230, only the speaker fixing portion 231 will be described.

The speaker fixing portion 231 has a rising portion 232 rising from the substrate portion 230 on the outer peripheral portion thereof, and the inner region thereof serves as a base surface portion 233 forming a part of the substrate portion 230 . A fixed locking piece portion 234 is formed on one side of the base surface portion 233 . Two slits 237 are formed on the side of the base surface 233 opposite to the side on which the fixed locking piece 234 is formed. The two slit portions 237 are formed parallel to each other and have arcuate portions with different diameters. As a result, elastic pieces 236 that are elastically deformable in the thickness direction of the substrate portion 230 are formed on the base portion 233 .

A moving locking piece portion 235 is formed at the tip of the elastic piece 236 so as to face the fixed locking piece portion 234 in the diameter direction of the speaker 217 . The elastic piece 236 of Embodiment 2-2 is the same as Embodiment 2-1 in that it is cantilevered on the substrate portion 30, but the slit portion 237 forming the elastic piece 236 is Since the elastic piece 236 reaches a position beyond the center of the base surface portion 233, the amount of deformation of the elastic piece 236 is larger than in the case of Embodiment 2-1. Therefore, when the speaker 217 is attached to the speaker fixing portion 231, the moving locking piece portion 235 can be easily locked to the locking concave portion 217e of the speaker 217, thereby facilitating the mounting work.

In addition, the slit portion 237 formed in the base surface portion 233 also functions as a through portion that allows the back surface 217b of the speaker 217 and the space portion formed on the rear surface portion 212 side of the housing 210 to communicate with each other. Therefore, the effect of increasing the sound pressure from the speaker 217 can also be obtained in the same manner as in the embodiment 2-1.

Next, Embodiment 2-3 of the present invention will be described. FIG. 14 shows a front view of a substrate portion 240 used in the fire alarm of Embodiment 2-3. Since Embodiment 2-3 also has the same configuration as Embodiment 2-1 except for the speaker fixing portion 241 provided on the substrate portion 240, only the speaker fixing portion 241 will be described.

The speaker fixing portion 241 has a rising portion 242 rising from the substrate portion 240 on the outer peripheral portion, and the area inside the rising portion 242 serves as a base surface portion 243 forming part of the substrate portion 240 . A fixed locking piece portion 244 is formed on one side of the base surface portion 243 . A moving locking piece portion 245 is formed on the opposite side of the base surface portion 243 to the side where the fixed locking piece portion 244 is formed. The moving locking piece portion 245 is formed in an island-shaped portion 246 which is connected to the substrate portion 240 by a bridge portion 247 having a small diameter.

Since the island-shaped portion 246 is connected to the substrate portion 240 by a bridge portion 247 having a small diameter, the island-shaped portion 246 is elastic with respect to the substrate portion 240 in its plane direction, specifically, in the direction away from the opposing fixed locking piece portion 244 . can be moved freely. This allows the moving locking piece 245 to move. When the speaker 217 is attached to the speaker fixing portion 241 , the speaker 217 , whose locking concave portion 217 e on one side is locked to the fixed locking piece portion 244 , moves on the island-shaped portion 246 due to the elastic deformation of the bridge portion 247 . By doing so, the other locking concave portion 217e can be locked to the moving locking piece portion 245. As shown in FIG.

A gap portion 248 is formed between the island portion 246 and the substrate portion 240 . Of these, the clearance 248 formed on the central position side of the base surface 243 of the island-shaped portion 246 is arranged in the base surface 243, so that it is formed on the rear surface 217b of the speaker 217 and the rear surface 212 of the housing 210. It also functions as a penetrating part that communicates with the space part. Therefore, the effect of increasing the sound pressure from the speaker 217 can also be obtained in the same manner as in the embodiment 2-1.

Although Embodiments 2-1 to 2-3 of the present invention have been described above, the application of the present invention is not limited to Embodiments 2-1 to 2-3, and can be applied in various ways within the scope of the technical idea. can be For example, in Embodiments 2-1 to 2-3 described above, the speaker fixing portion 220 has one fixed locking piece portion 223 and one moving locking piece portion 224, which are arranged to face each other. However, three or more locking pieces may be arranged at a plurality of positions in the circumferential direction of the speaker 217 . In this case, at least one locking piece portion can be a movable locking piece portion, and the other locking piece portions can be fixed locking piece portions.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. In the third embodiment, the alarm is assumed to be a fire alarm. FIG. 15 shows a front view of the fire alarm in Embodiment 3. As shown in FIG. The fire alarm device of Embodiment 3 has an alarm body 301 that detects the occurrence of a fire and issues an alarm.

The alarm main body 301 has a housing 310 that has therein a sensor for detecting smoke and the like. The housing 310 has a smoke inlet on the side, guides smoke into the housing 310 through the smoke inlet, and detects the smoke with a sensor.

The housing 310 has a front surface 311 facing the inside of the room. The front surface 311 has operation buttons 313 for performing various operations, and an acoustic hole for emitting sound from a speaker provided inside the housing 310. 314 are provided. The housing 310 is formed with an opening 310a for arranging the operation button 313 and exposing it to the front side.

When starting to use the fire alarm, the power can be turned on by pressing the operation button 313 first. When powered on, the fire alarm begins sensing fire. Further, after the power is turned on, the sensor can be tested by pressing the operation button 313 under normal conditions. Normal tests can also be performed for dead batteries, replacement deadline messages, and speaker disconnection. Furthermore, when a fire is detected by a sensor and an alarm is issued, the alarm can be stopped by pressing the operation button 313 . In this way, the operation button 313 can cause the fire alarm to perform different operations depending on the situation by one pressing operation.

FIG. 16 shows a cross-sectional view taken along line AA of FIG. As shown in this figure, a battery housing portion 316 is formed in the upper portion of the rear surface of the alarm main body 301, and a battery 317 is housed therein. The battery housing portion 316 is formed in a recessed shape that opens to the back side, and the opening is not covered. As a result, the housing 310 is thinned by the thickness of the lid.

The operation button 313 has an operation section 320 exposed from the opening 310 a of the housing 310 . The operation unit 320 is substantially flush with the front surface 311 of the housing 310 , and can be operated by pressing the operation unit 320 toward the back side of the housing 310 . A switch 318 is arranged in the housing 310 so as to face the operation portion 320 of the operation button 313, and the switch 318 is pressed as the operation button 313 is pressed. By pressing the switch 318 , the fire alarm can detect the pressing operation of the operation button 313 .

A configuration of the operation button 313 will be described in more detail. 17 is a front view of the operation button 313, FIG. 18 is a side view of the operation button 313, FIG. 19 is a cross-sectional view of FIG. 17 along line AA, and FIG. , respectively. The operation button 313 includes an operation portion 320 formed in a generally elliptical shape when viewed from the front and elongated in the vertical direction, and a pair of two outwardly extending portions 321 hanging downward from the lower end portion, which is one end portion of the operation portion 320 . , an elastic piece 323 hanging downward from the lower end of the operating portion 320 between the outwardly extending portions 321, and a rearwardly extending portion 325 extending from the operating portion 320 toward the rear side. The two outwardly extending portions 321 and the rearwardly extending portion 325 are integrated to form a substantially U-shaped cross section that opens downward.

Rotating shaft portions 322 projecting sideways are formed on the outward surfaces of the outwardly extending portions 321 . The rotating shaft portion 322 is rotatably locked to the bearing portion 310 b of the housing 310 . As a result, the operation button 313 can rotate about the rotating shaft portion 322 in a direction of tilting toward the rear side.

As shown in FIG. 19, the elastic piece 323 is formed in a thin plate shape, and is elastically deformable along the pressing direction of the operating portion 320 . A locking portion 324 is formed at the tip of the elastic piece 323 so as to protrude toward the front side. The locking portion 324 is locked to a locking receiving portion 310c formed near the lower end portion of the inner surface of the housing 310, as shown in FIG. In this locked state, the elastic piece 323 is slightly urged in the direction in which the operation button 313 returns from being pressed, that is, toward the front side of the alarm body 301 .

The operation button 313 has an edge portion 328 around the operation portion 320 . Further, the housing 310 has a stepped portion 310d at the edge of the opening 310a, and the edge 328 of the operation button 313 contacts the stepped portion 310d from the rear side. As described above, the operation button 313 is urged toward the front side of the alarm body 301 by the elastic piece 323, so that the edge 328 of the operation button 313 is pressed against the stepped portion 310d of the housing 310. It has become. This prevents the operation button 313 from wobbling or falling off due to unexpected force.

The elastic piece 323 is originally urged in the direction in which the operation button 313 returns. Since it is locked to the body 310, it elastically deforms so as to warp toward the back side, and urges the operation button 313 in the return direction with a stronger force.

As shown in FIG. 20, the rear extending portion 325 is formed with a lateral slit portion 326 in the vicinity of the rear end thereof. FIG. 21 shows a perspective view from the rear side of the fire alarm. As shown in this figure, the rear extension portion 325 of the operation button 313 is exposed on the rear side of the housing 310 .

FIG. 22 shows an enlarged view of the vicinity of the rear extension portion 325 in FIG. 21. As shown in FIG. This figure shows a state in which the drawstring 330 is attached to the rear extension portion 325 . The tip of the drawstring 330 can be passed through the slit 326 . A knot is formed at the tip of the drawstring 330, and the width of the slit portion 326 is set to be larger than the diameter of the drawstring 330 and smaller than the diameter of the knot. For this reason, a knot is formed in advance at the tip of the drawstring 330, a portion of the drawstring 330 opposite to the tip side of the knot is inserted into the slit portion 326, and the drawstring 330 is pulled downward. The drawstring 330 can be easily attached to the operation button 313 . Since the slit portion 326 to which the drawstring 330 is attached is formed on the upper rear side with respect to the rotation shaft portion 322, by pulling the drawstring 330 downward, the operation button 313 can be pulled back with the rotation shaft portion 322 as the center. It can be rotated in a direction of tilting to the side.

Since the slit portion 326 is formed near the rear end of the rearwardly extending portion 325, the width of the rear end portion 325a between the slit portion 326 and the rear end of the rearwardly extending portion 325 is reduced. there is Therefore, the rear end portion 325a of the rear extension portion 325 can be deformed in the direction of widening the width of the slit portion 326. As shown in FIG.

When a large force is applied to the drawstring 330 and the force is transmitted to the operation button 313 as it is, the operation button 313 and the housing 310 may be damaged. Since the slit part 326 is deformable in the direction of widening the width, when a large downward force is applied to the drawstring 330, the knot expands the slit part 326 and comes off as it is. A large force can be prevented from being applied to the operation unit 320 . The magnitude of the force for removing the knot of the drawstring 330 from the slit portion 326 can be appropriately set according to the strength of the operation button 313 and the housing 310, but in the third embodiment, it is about 8 to 10 kg.

FIG. 23 shows an enlarged view of the lower portion of the housing 310 in the BB section of FIG. As shown in this figure, a housing 310 has a U-shaped bearing portion 310b that opens upward. It's becoming

FIG. 24 shows an enlarged cross-sectional view of the lower portion of the housing 310 when the operation button 313 is pressed from the state shown in FIG. Since the operation button 313 is rotatable around the rotating shaft portion 322 positioned below, as shown in FIG. Then, the operation unit 320 presses the switch 318 inside the housing 310 . At this time, as described above, the elastic piece 323 of the operation button 313 urges the operation button 313 in the return direction by engaging the engagement portion 324 with the engagement receiving portion 310c of the housing 310. However, from this state, it is elastically deformed so as to further urge the operation button 313 in the return direction. Therefore, when the operation unit 320 is released, the operation button 313 can return to its original position. It should be noted that the operation button 313 operates in the same manner when the pull string 330 is attached to the rear extension portion 325 and the pull string 330 is pulled.

In this way, the housing 310 having the bearing portion 310b and the operation button 313 which is integrated as a whole and has the rotating shaft portion 322 constitute the push button, so that the pressing operation and the returning operation can be performed with a simple structure. can. In addition, since the number of parts is small, variation in pressing operation due to part tolerance can be suppressed.

Further, since the rotation shaft portion 322 serving as the rotation center of the operation button 313 is formed in the outwardly extending portion 321 below the operation portion 320 to be pressed, the pressing depth of the operation portion 320 can be sufficiently increased. can be secured. In particular, since the operating portion 320 has a substantially elliptical shape that is long in the vertical direction, it is possible to increase the distance from the rotating shaft portion 322 and increase the pressing depth.

In addition, an elastic piece 323 having a locking portion 324 at its tip is formed below the operation button 313, and the locking portion 324 is locked to the housing 310. Therefore, when the operation portion 320 is pressed, , the elastic piece 323 is elastically deformed to urge the operation button 313 in the returning direction. Further, the elastic piece 323 urges the operation button 313 in the return direction with the locking portion 324 locked to the housing 310 , and the edge portion 328 of the operation button 313 contacts the stepped portion 310 d of the housing 310 . Since it abuts from the side, it is possible to prevent the operation button 313 from wobbling or coming off the housing 310 .

Although Embodiment 3 of the present invention has been described above, application of the present invention is not limited to Embodiment 3, and can be applied in various ways within the scope of its technical ideas. For example, the position, size, and shape of the operation button 313 on the alarm body 301 are not limited to those of the third embodiment. In Embodiment 3, the operation button 313 has a shape elongated in the vertical direction, but may have a shape elongated in the horizontal direction, or may have a circular shape, a rectangular shape, or the like. Also, the position of the rotation shaft portion 322 of the operation button 313 is not limited to the lower end portion, and may be the upper end portion, the left and right ends, or the like. Furthermore, in Embodiment 3, the alarm is a fire alarm, but other types of alarm such as a gas alarm may be used.

[Embodiment 4]
Finally, Embodiment 4 of the present invention will be described in detail with reference to the drawings. FIG. 25 shows a perspective view of the fire alarm device according to Embodiment 4 as seen from the front side. The fire alarm of Embodiment 4 has an alarm main body 401 that detects the occurrence of a fire and issues an alarm, and a mounting plate 402 that mounts the alarm main body 401 on an installation surface.

The alarm main body 401 has a housing 410 that has therein a sensor for detecting smoke and the like. The housing 410 has a smoke inlet 412 on its side surface, through which smoke is introduced into the housing 410 and detected by a sensor.

The housing 410 has a front surface 411 facing the inside of the room. The front surface 411 has operation buttons 413 for performing various operations and an acoustic hole for emitting sound from a speaker provided inside the housing 410. 414 are provided.

The mounting plate 402 is provided on the back side of the alarm body 401 and can fix the alarm body 401 . The installation surface to which the mounting plate 402 is fixed is the wall surface of the house in the fourth embodiment. However, the installation surface may be another surface such as the ceiling surface of a house. After the mounting plate 402 is fixed to the vertical installation surface, the alarm main body 401 is mounted and fixed to the mounting plate 402 .

FIG. 26 shows a longitudinal sectional view of the fire alarm. The mounting plate 402 has a screw hole portion 421 and is fixed to the installation surface by a screw 22 inserted through the screw hole portion 421 . The mounting plate 402 also has an alarm fixing surface portion 420 for fixing the back side of the alarm main body 401 . The alarm main body 401 is locked and fixed to the alarm fixing surface portion 420 .

The alarm main body 401 has a battery housing portion 416 in the upper portion of the housing 410, and a battery 417 is housed in the battery housing portion 416. As shown in FIG. Further, inside the housing 410, a smoke detector 430 for detecting smoke that has flowed in from the smoke inlet 412 is arranged. The smoke detection section 430 is provided on a substrate section 432 housed in the housing 410, and has a smoke detection region 431 for blocking light from the outside and detecting intruding smoke. It has a smoke detector cover 433 for covering.

FIG. 27 shows a perspective view of a substrate portion 432 having a smoke detection portion 430. As shown in FIG. As shown in this figure, the substrate portion 432 has a substantially circular shape with a part missing, and is provided so as to cover the central portion thereof with the smoke detection portion cover 433 . The top surface of the smoke detector cover 433 is a circular base 440 . A net member 434 for preventing insects and the like from entering the smoke detection area 431 is provided on the outer peripheral surface portion of the smoke detection section cover 433 . In addition, a speaker housing portion 432a for housing and fixing the speaker 418 is formed in the peripheral portion of the substrate portion 432. As shown in FIG.

FIG. 28 shows a cross-sectional view showing the inside of the smoke detector 430. As shown in FIG. A plurality of light shielding wall portions 441 are erected from the base portion 440 toward the substrate portion 432 of the smoke detector cover 433 . As shown in this figure, the light shielding wall portion 441 of the smoke detection section cover 433 has a single plate shape extending in one direction. Surrounding. The extending direction of the light blocking wall portion 441 faces both the circumferential direction and the radial direction of the smoke detection area 431 . A gap is provided between the light shielding wall portions 441 so that smoke can enter the smoke detection area 431 . On the other hand, one end portion 441a of the light shielding wall portion 441 and the other end portion 441b of the adjacent light shielding wall portion 441 are arranged so as to overlap each other in the circumferential direction.

An arc-shaped surface portion 441 c forming the outer peripheral surface of the smoke detection area 431 is formed on the outer peripheral surface of one end portion 441 a of the light shielding wall portion 441 . The plurality of light shielding wall portions 441 form an intermittent circumferential surface on the arcuate surface portion 441c. A net member 434 is arranged and fixed so as to form the outer peripheral surface of the smoke detector cover 433 along the arcuate surface portion 441c.

A light emitting part 435 and a sensor part 436 are arranged on an installation base part 437 inside the smoke detection area 431 . The light-emitting part 435 is composed of a laser diode, an infrared LED, or the like that can emit light, and is arranged so as to face the center upper side of the smoke detection area 431 . The sensor unit 436 is arranged on the opposite side across the center of the smoke detection area 431 and faces the center upper side of the smoke detection area 431 . The sensor unit 436 is composed of a photodiode or the like capable of detecting light incident on the detection position 436a.

Since the light emitted from the light emitting section 435 is emitted obliquely upward from the sensor section 436, the sensor section 436 normally does not detect the light. On the other hand, when smoke enters the smoke detection area 431 , the light from the light emitting section 435 is scattered by the smoke, and part of the light enters the detection position 436 a of the sensor section 436 . This allows the sensor unit 436 to sense light and detect the presence of smoke.

The smoke detection area 431 is surrounded by the light shielding wall 441 so that light from the outside cannot enter, and the light shielding wall 441 is made of a material that hardly reflects light. ing. However, since the light shielding wall portion 441 facing the light emitting portion 435 directly receives the strong light from the light emitting portion 435, part of the light is reflected. When the reflected light enters the sensor section 436, there is a possibility that the sensor section 436 detects light even though there is no smoke. In order to prevent this, an uneven surface portion 441 d is formed on the inner peripheral surface of the light shielding wall portion 441 that receives the light from the light emitting portion 435 . When light is reflected by the uneven surface portion 441d, the light is scattered by the unevenness, so that the amount of reflected light incident on the detection position 436a of the sensor portion 436 is reduced, and malfunction can be prevented.

FIG. 29 shows an enlarged view near the smoke detection area 431 in FIG. Of the lines radially extending from the detection position 436a of the sensor portion 436, the line passing through the other end portion 441b of the light shielding wall portion 441 is located on the outer peripheral side of the other end portion 441b of the light shielding wall portion 441. It intersects with the one end portion 441a. For example, the dashed line R1 passes through the other end portion 441b of the light shielding wall portion 441 and extends over the one end portion 441a of the adjacent light shielding wall portion 441 . The same applies to dashed lines R2 and R3. Furthermore, the same applies to the light shielding wall portions 441 other than those indicated by the dashed lines R1 to R3. In other words, one of the light shielding wall portions 441 is always positioned on the radiation centered on the detection position 436 a of the sensor portion 436 . In this way, the light shielding wall portion 441 is arranged so that light entering the smoke detection region 431 from the outside does not directly reach the detection position 436 a of the sensor portion 436 .

As described above, the light shielding wall portions 441 are arranged so as to overlap each other in the radial direction so that one of the light shielding wall portions 441 is positioned on the radiation centered on the detection position 436a of the sensor portion 436. , external light passing through the gaps between the light shielding walls 441 does not directly reach the detection position 436a of the sensor section 436, and the sensor section 436 detects only scattered light from the light emitting section 435. As a result, it is possible to reliably prevent malfunction of the sensor section 436 due to external light. In addition, the light blocking wall portion 441 can block external light from entering not only the detection position 436 a of the sensor portion 436 but also the central region of the smoke detection region 431 . In the smoke detection area 431, when external light enters the area between the light emitting section 435 and the sensor section 436, it is scattered by low-concentration smoke or the like, and the light is not directly incident on the detection position 436a of the sensor section 436. However, since the light shielding wall 441 prevents external light from entering the center area of the smoke detection area 431, the malfunction can be prevented.

The light blocking wall portion 441 has a single plate shape extending in one direction, and by minimizing the overlapping of the light blocking wall portions 441 in the radial direction, the diameter of the smoke detector cover 433 can be reduced. can. In FIG. 28, the speaker 418 housed in the speaker housing portion 432a is indicated by a dashed line. Therefore, the sound from the speaker 418 is not blocked by the light shielding wall portion 441, and sufficient sound pressure can be ensured at the time of the alarm. In addition, since the diameter of the smoke detector cover 433 can be reduced, the size of the alarm body 401 can be reduced.

Although the fourth embodiment of the present invention has been described above, application of the present invention is not limited to the fourth embodiment, and can be applied in various ways within the scope of its technical ideas.

[Embodiment 5]
(Basic Concept of Embodiment 5)
First, the basic concept of Embodiment 5 will be explained. Embodiment 5 generally relates to an alarm device that is attached to an installation surface of an object to be installed, and that has a mounting surface facing the installation surface. Here, the "alarm device" is a device that issues an alarm, specifically, a device that issues an alarm about a substance to be detected contained in the gas in the monitored area. and fire alarms (smoke alarms). A “monitoring area” is an area to be monitored, and more specifically, an area in which an alarm device is installed. It is a concept that includes Further, the "installation object" is an object on which the alarm device is installed, and includes, for example, a ceiling, a wall, etc. within the monitoring area. In addition, the “installation surface” is the surface of the installation object on which the alarm device is installed, and for example, the surface of the ceiling on the monitoring area side (i.e., the lower surface of the ceiling), the surface of the wall on the monitoring area side (i.e., , the indoor side of the wall) and the like. Further, the "mounting surface" is a surface provided in the alarm device, and more specifically, a surface to be mounted on the installation surface while facing the installation surface. Further, the term "substance to be detected" is a substance to be detected, specifically, a substance contained in gas, and is a concept including, for example, carbon monoxide in gas, smoke, and the like.

In the following Embodiment 5, the "substance to be detected" is "smoke", the "alarm device" is a "fire alarm (smoke alarm)" that gives an alarm based on scattered light due to smoke, and the "monitoring area ' is a 'room as an area within a house'. In addition, as described above, the "installation object" includes a "ceiling" or a "wall". The case where the "object" is a "wall" will also be properly explained.

(Constitution)
First, the configuration of the alarm device according to Embodiment 5 will be described. 30 is a perspective view of an alarm device according to Embodiment 5, FIG. 31 is a bottom view of the alarm device, FIG. 32 is a side view of the alarm device, and FIG. 34 is an exploded perspective view of the alarm device seen from below, and FIG. 35 is an exploded perspective view of the alarm device seen from above. In the following description, the XYZ directions shown in each drawing are directions orthogonal to each other. Specifically, the Z direction is the vertical direction (that is, the direction in which gravity acts). Assuming that the Y direction is a horizontal direction orthogonal to the vertical direction, for example, the Z direction is called the height direction, the +Z direction is called the upper side (plane), and the −Z direction is called the lower side (bottom surface). explain. In addition, the term "XYZ direction" below is a convenient expression for describing the relative positional relationship (or direction) of each component in the illustrated alarm device 5100. With the central position of the detection space 534 of the case 502 in FIG. 33 as a reference, the direction away from the detection space 534 will be referred to as "outside" and the direction approaching the detection space 534 will be referred to as "inside" in the following description.

The alarm device 5100 shown in these figures is alarm means for detecting smoke, which is a substance to be detected contained in gas, and giving an alarm. Specifically, as shown in FIG. An installation surface 5900 that is the lower (−Z direction) surface (that is, the lower surface), or an installation surface (not shown) that is the surface of the wall of the monitoring area on the monitoring area side (that is, the indoor side of the wall) (hereinafter referred to as Specifically, it includes a mounting base 501, a case 502, a detection unit cover 503 in FIG. In the following description, the installation surface 5900 extends in the direction along the XY plane (that is, the horizontal direction), and the "wall installation surface" (not shown) extends in the direction that is perpendicular to the installation surface 5900 (that is, the vertical direction). A case where is spread to . Below, after explaining the structure of the whole alarm device 5100, the detail of each structure is demonstrated.

(Configuration - Mounting base)
First, FIG. 36 is a bottom view of the mounting base, and FIG. 37 is a plan view of the mounting base. The mounting base 501 shown in FIG. 32 is mounting means for mounting the case 502 to the installation surface 5900 or the "wall installation surface" (not shown). More specifically, it comprises a mounting hook 511 and a body portion 512 shown in FIG.

(Configuration - mounting base - mounting hook)
The mounting hook 511 in FIG. 36 is for mounting (that is, installing) the mounting base 501 on the mounting surface 5900 or a “wall mounting surface” (not shown), and specifically, it protrudes from the main body portion 512 . It is a protruding piece and has, for example, a screw hole 5111 . The screw hole 5111 is a hole through which a mounting screw (not shown) for mounting the mounting base 501 is inserted. Then, by continuously inserting mounting screws through the screw holes 5111 and the mounting surface 5900 or the "wall mounting surface" (not shown), the mounting base 501 is mounted on the mounting surface 5900 or the "wall mounting surface" (not shown). can be attached to the

(Configuration - Mounting base - Main unit)
A main body portion 512 in FIG. 36 is the main body of the mounting base 501, and is, for example, widened in the direction along the XY plane and has a disc shape with a predetermined diameter, and is integrally formed with the mounting hook 511. More specifically, it has a case-side facing surface 512A and an installation-surface-side facing surface 512B in FIG. The case-side facing surface 512A in FIG. 36 is a surface to which the case 502 is attached facing the case 502 as shown in FIG. It is an attachment surface to be attached to the installation surface 5900 (that is, an attachment surface that spreads in the direction along the XY plane). In addition, the main body portion 512 includes a screw hole 5121 and an engaging portion 5122 as shown in FIG. The screw hole 5121 is a hole through which a mounting screw (not shown) for mounting the mounting base 501 on the installation surface 5900 is inserted. The mounting base 501 can be attached to the installation surface 5900 by continuously inserting the installation screws through the insertion holes 121 and the installation surface 5900 . The engaging portion 5122 is attachment means for attaching the case 502 of FIG. 32, and specifically engages with the engaging portion 5214 of the back case 521 of FIG. 35, which will be described later. The outer diameter of the main body portion 512 can be set arbitrarily. explain.

(configuration - case)
Next, the case 502 in FIG. 32 is housing means for housing the detection unit cover 503, the detection unit main body 504, and the circuit unit 505 (hereinafter, objects to be housed) in FIG. More specifically, it comprises a back case 521 and a front case 522 shown in FIG.

(Configuration - case - back case)
38 is a bottom view of the back case, FIG. 39 is a plan view of the back case, and FIG. 40 is a front view of the back case. As shown in FIG. 34, the rear case 521 in each of these figures is the first housing means for housing the "object to be housed" from the side of the mounting base 501 (that is, the upper side (+Z direction)), and is coupled with the front case 522. As a result, a gap is formed as an external inflow opening 523 described later in FIG. 32 with the front case 522 . In addition, the back case 521 is an external guiding means for guiding gas moving outside the case 502 of FIG. 33 (including gas moving along the installation surface 5900) to the inside of the case 502, and It is an internal guiding means for guiding the gas moving inside the case 502 to a detection space 534 which will be described later.

The back case 521 shown in FIGS. 38 to 40, for example, spreads in the direction along the XY plane and has a disc shape with a diameter larger than that of the mounting base 501 ("back case 521 It is made of resin integrally formed as a whole, and more specifically, it has a back case side facing wall 5211 and a back case side outer peripheral wall 5212 . The back case side facing wall 5211 in FIG. 33 forms a portion of the back case 521 that widens in the direction along the XY plane. Prepare. The guide concave portion 5211a is guide means for guiding the gas to the detection space 534 of FIG. 33, and the details thereof will be described later. In addition, the back case side outer peripheral wall 5212 is a first outer wall forming a portion (outer wall) extending in the height direction (Z direction) of the back case side 521, and , and extends downward (-Z direction).

Further, the back case 521 in FIG. The product cases 5611 to 5616, short fins 5621 to 5623, long fins 5631 and 5632, prevention pieces 5641 and 5642, and ribs 5651 to 5659" are collectively referred to as "inner members of the back case 521"). First, the component cases 5611 to 5616 are storage means for storing the components that constitute the alarm device 5100. More specifically, the component cases 5611 to 5616 are storage means for partitioning the component storage space that is the space for storing the components. It has walls. The component cases 5611 to 5616 (specifically, the housing walls of the component cases 5611 to 5616) are guide means for guiding the gas to the detection space 534 in FIG. , and the location of the components. Short fins 5621-5623 are guiding means for guiding gas to detection space 534 in FIG. Long fins 5631 and 5632 are guide means for guiding gas to detection space 534 in FIG. is also sufficiently long. In addition, the prevention pieces 5641 and 5642 are guiding means for guiding the gas to the detection space 534 in FIG. is a preventive means for preventing intrusion into the detection space 534 of FIG. Ribs 5651 to 5659 in FIG. 38 are guiding means for guiding the gas to the detection space 534, reinforcing means for reinforcing the back case 521, and between the front case 522 and the back case 521 in FIG. 32 (that is, the width of the external inflow opening 523 in FIG. 32). Specifically, the external inflow opening 523 and the case 502 in FIG. , and is provided, for example, on the back case side facing wall 5211 . The “width of the external inflow opening 523” indicates the distance from the upper end to the lower end of the external inflow opening 523. As shown in FIG. Further, in the following description, when there is no need to distinguish between the ribs 5651 to 5659, they will be collectively referred to as the "rib 565", and the details of the "internal member of the back case 521" will be described later.

(Configuration - Case - Front Case)
41 is a plan view of the front case, and FIG. 42 is a front view of the front case. As shown in FIG. 34, the front case 522 in each of these figures accommodates the "accommodated object" from the side opposite to the mounting base 501 side (that is, the lower side (+Z direction)) across the "accommodated object". Specifically, it forms a gap as an external inflow opening 523 in FIG. Here, the "external inflow opening" 23 is an inflow means for allowing the gas outside the case 502 to flow into the inside of the case 502. In particular, the gas moving along the installation surface 5900 outside the case 502 is introduced into the case. It is a first inflow opening for flowing into the inside of the case 502, and is a gap formed between the back case 521 and the front case 522 of the case 502 so as to extend in the direction along the XY plane. The width of the external inflow opening 523 can be arbitrarily set in consideration of the prevention of dust, ambient light, or the entry of the user's finger, the impression given to the user by the appearance of the alarm device 5100, and the like. In the following description, it is assumed that the distance is set to 3 to 5 (mm), for example. The front case 522 is external guide means for guiding gas moving outside the case 502 in FIG. 33 (including gas moving along the installation surface 5900) to the inside of the case 502.

The front case 522 shown in FIGS. 41 and 42, for example, spreads in the direction along the XY plane and has a disc shape with a diameter larger than that of the back case 521, and is integrally formed as a whole. More specifically, it includes a front case side exposed wall 5221 and a front case side outer peripheral wall 5222 . First, the front case-side exposed wall 5221 forms a portion of the front case 522 that spreads in the direction along the XY plane, that is, it is exposed so as to be mainly visually recognized by the user. 33 is a second outer wall forming a portion (outer wall) extending in the height direction (Z direction) of the front case 522, and is the outer edge of the front case side exposed wall 5221. It extends upward (+Z direction) while spreading outward from the part.

Further, the front case 522 of FIG. 35 more specifically includes a push button 5223, a screw boss 5224, and a support portion 5225. First, the push button 5223 is an operating means for operating the alarm device 5100, and more specifically, it is used to push a switch 5555 of the circuit section 505 (described later in FIG. 34) from the outside of the front case 522. Also, the screw boss 5224 in FIG. 35 is positioned to determine the relative positional relationship in the height direction (Z direction) between the front case 522 and the back case 521 (that is, the width of the external inflow opening 523 in FIG. 32). It is a determining means and also a fixing means for fixing the front case 522 and the back case 521 of FIG. 35 to each other. For example, it has a predetermined screw hole and has a columnar shape standing in the height direction (Z direction). Further, the support portion 5225 is support means for supporting the detection portion main body 504. More specifically, a plurality of support portions 5225 are provided on the upper (+Z) surface of the front case side exposed wall 5221 on the side of the front case side outer peripheral wall 5222 side. It is a projecting piece.

(Construction - detector cover)
Next, FIG. 43 is a bottom view of the detector cover, and FIG. 44 is a front view of the detector cover with the insect screen omitted. The detector cover 503 in each of these figures is for detecting smoke using scattered light. Specifically, it partitions the detection space 534 in FIG. (+Z). Note that the detection unit cover 503, the detection space 534, a part of the detection unit main body 504, a light emitting unit 552, and a light receiving unit 553, which will be described later, correspond to the detection means. As shown in FIG. 34, the detector cover 503 has a cylindrical shape with one opening closed, and more specifically includes a ceiling plate 531 , a labyrinth 532 and an insect screen 533 . Here, the “detection space” 534 in FIG. 33 is the space in which smoke is detected. The ceiling plate 531 in FIG. 34 covers the detection space 534. Specifically, the ceiling plate 531 is formed in a disk shape with a diameter smaller than that of the case 502, and the labyrinth 532 is integrated with the lower (−Z direction) surface. is formed The labyrinth 532 is a partition wall that partitions the detection space 534. Specifically, it prevents disturbance light from entering the detection space 534. For example, as shown in FIG. are provided in plurality along the By configuring in this manner, internal inlet openings 535 are formed between adjacent labyrinths 532 . Here, the “internal inflow opening” 535 is a second inflow opening that allows gas to flow into the detection space 534 and is formed as a gap between the labyrinths 532 . In the following, when each of the plurality of internal inflow openings 535 is to be distinguished, alphabetic characters such as "a" and "b" are attached to the symbol "535", for example, symbol "535a" and symbol "535b". , and when not distinguishing between the plurality of internal inflow openings 535, the reference numeral "535" is used for description (the same applies to the labyrinth 532). Returning to FIG. 34, the insect screen 533 is an insect control means that allows outside air to enter the detection space 534 through the small holes of the insect screen 533, while preventing insects from entering the detection space 534. The labyrinth 532 is formed in an annular shape surrounding the outer periphery, and has a large number of small holes on its side surfaces that are of a size that makes it difficult for insects to enter.

(Construction - detection unit body)
Next, FIG. 45 is a bottom view of the detection section main body, FIG. 46 is a plan view of the detection section main body, and FIG. 47 is a front view of the detection section main body. 33, the detector body 504 in each of these figures is arrangement means for arranging the detector cover 503, and partition means for partitioning the detection space 534 together with the detector cover 503. As shown in FIG. Further, the detecting portion main body 504 is covering means for covering the circuit board 551 , and is a covering means in which the detecting portion cover 503 is arranged on the side opposite to the circuit board 551 with the detecting portion main body 504 interposed therebetween. Specifically, after shielding the gas that has flowed into the case 502 from the external inflow opening 523 from entering between the detector main body 504 and the front case 522, the flow path of the gas is blocked between the back case 521 and the back case 521. to form. The detector main body 504 extends, for example, in the direction along the XY plane from the detector cover 503 side in FIG. has a large diameter and is slightly smaller in diameter than the front case 522, and has a partially notched disk shape, and a part of the inner side faces downward (-Z direction ) to the upper side (+Z direction), and is integrally made of resin as a whole. Note that "slightly smaller in diameter than the front case 522" means that the diameter of the detection unit main body 504 is such that the detection main body side end 5400a abuts the front case side end 5222a from the inside as shown in FIG. (or close). The “detection main body side end portion” 5400a is the outer edge of the detection main body 504 and the edge on the external inflow opening 523 side.

More specifically, the detection unit main body 504 of FIG. Prepare. The flange portion 541 is a portion of the detecting portion main body 504 that spreads outward in the direction along the XY plane, and includes the positioning concave portion 411 . The positioning recesses 411 are positioning means for positioning the ribs 565 of the back case 521 with respect to the detector main body 504. Specifically, a plurality of the positioning recesses 411 are provided on the outer edge of the flange portion 541. It is recessed from (+Z side) downward (-Z side). In addition, the inclined portion 542 is a portion continuous from the flange portion 541, and in order to provide the detection space 534 in FIG. ) is inclined upward (+Z direction). In addition, the raised portion 543 is a portion where the detection portion cover 503 is provided, is located above the flange portion 541 (in the +Z direction), continues from the inclined portion 542, and spreads in the direction along the XY plane. This is the part where An arrangement recess 5431 shown in FIG. 35 is formed on the upper (+Z direction) surface of the raised portion 543 . This placement recess 5431 is a portion where the detection section cover 503 is placed, and more specifically, is a circular recess having a diameter corresponding to the outer diameter of the detection section cover 503 . Further, the detector main body notch portion 544 is a portion cut out in a shape corresponding to the outer shape of the component case 5616 to be described later for providing the alarm device 5100 with the component case 5616 . Moreover, in order to accommodate a speaker (not shown) between the detection unit main body 504 and the front case 522, the speaker accommodation unit 545 is arranged from the bottom (-Z direction) to the upper side so as to correspond to the external shape of the speaker to be accommodated. It is a portion that protrudes toward (+Z direction). Note that the speaker is output means for outputting an alarm based on the amount of reflected light received by the light receiving unit 553 . The specific form of the sound output from the speaker is arbitrary, and it is possible to output a synthesized sound generated as necessary, a pre-recorded sound, an alarm sound, or the like. Further, the element cover 546 covers the light emitting portion 552 and the light receiving portion 553 described later in the circuit portion 505 from the upper side (+Z direction) to prevent dust from accumulating on the light emitting portion 552 and the light receiving portion 553. , is formed integrally with the placement recess 5431 near the center of the placement recess 5431 in the raised portion 543 . Details of the flange portion 541 and the speaker housing portion 545 will be described later.

(Structure - Circuit part)
Next, FIG. 48 is a bottom view of the circuit portion, FIG. 49 is a plan view of the circuit portion, and FIG. 50 is a front view of the circuit portion. The circuit portion 505 in each of these figures is circuit means forming an electric circuit for giving an alarm. CN1 is provided. The circuit board 551 is a mounting means on which each element of the alarm device 5100 is mounted, and in particular, is a board on which the light emitting section 552 and the light receiving section 553 are mounted. Specifically, the upper (+Z direction) mounting surface (hereinafter referred to as the upper mounting surface) or the lower (−Z direction) mounting surface (hereinafter referred to as the lower mounting surface) so that each element is mounted using solder or the like, through holes and the through holes are provided at predetermined positions. are provided with terminals surrounding the . Specifically, as shown in FIG. 33, the light emitting unit 552 is mounted on the upper mounting surface of the circuit board 551 so as to emit light toward the detection space 534 provided above (in the +Z direction) the light emitting unit 552. device, for example a light emitting diode. The light-receiving unit 553 is light-receiving means for receiving scattered light generated by the light emitted by the light-emitting unit 552 being scattered by smoke particles. A device, such as a photodiode, mounted on the upper mounting surface of the circuit board 551 so as to receive light from the provided detection space 534 . A shield 554 in FIG. 50 is shielding means for electromagnetically shielding the light receiving section 553, and is support means for supporting the light receiving section 553 with respect to the circuit board 551. Specifically, the circuit board 551 A conductive element mounted on the upper mounting surface of the is made of metal, for example. A switch 555 in FIG. 48 is an operating means for operating the alarm device 5100, and more specifically, is an element mounted on the lower mounting surface of the circuit board 551, and is, for example, a push switch. The power connector CN1 in FIG. 49 is a supply means for supplying a power supply voltage to the alarm device 5100. Specifically, it is for supplying a power supply voltage from a battery (not shown) as a power supply. are mounted on the upper mounting surface of the circuit board 551 .

(Composition - Details)
Next, the configuration of the alarm device 5100 according to Embodiment 5 will be described in more detail. Specifically, the configurations of the detection unit main body 504, the circuit board 551, and the front case 522 will be described in detail.

(Configuration - Details - Main body of detection unit)
First, the details of the flange portion 541, the battery holding spring 548, and the speaker housing portion 545 in the detection portion main body 504 will be described. FIG. 51 is an enlarged perspective view of the detector main body 504. FIG.

(Structure - Details - Detector Main Body - Flange)
The flange portion 541 is a flange for promoting the inflow of gas into the detection space 534 and is a flange integrally formed on the outer edge portion of the detection portion main body 504 . Specifically, as shown in FIG. 33, the flange portion 541 extends to a position where it abuts against the inner peripheral surface of the front case 522. The gap with the inner peripheral surface of 522 is sealed. As a result, it is possible to prevent smoke from entering the space between the detection unit main body 504 and the front case 522 from the external inflow opening 523 through the gap, and the amount of smoke flowing into the detection space 534 can be prevented. can be increased. The thickness and material of the flange portion 541 are arbitrary, and in the fifth embodiment, the flange portion 541 is formed of the same thickness and the same material (resin) as the other portions of the detection portion main body 504 .

(Configuration - Details - Detector Main Body - Battery Retaining Spring)
The battery holding spring 548 is a power urging means for urging and holding a power supply section that supplies power to the alarm device 5100 , and is a power urging means integrally formed with the detection section main body 504 . Specifically, as shown in the figure, the battery holding springs 548 are arranged along the edges of the detection section main body notch 544 on the lower side (−Z direction) of the detection section main body 504 at predetermined intervals. It is formed in two places. Here, the battery holding spring 548 has a substantially U-shape that protrudes downward (−Z direction) from the arrangement location, is bent outward (−X direction), and then protrudes upward (+Z direction). , and is configured in a shape capable of urging the power supply section outward (−X direction) from the notch 544 of the main body of the detection section. Note that the space between the base and tip of the battery holding spring 548 will be referred to as a “biasing space” 549 in the following description.

Here, as shown in FIGS. 34, 35, and 38, the component case 5616 of the back case 521 is notched downward (-Z direction) at a position corresponding to the battery holding spring 548. There are two component case cutouts 5617 that are flush with each other. Note that this component case notch 5617 is not provided through in the height direction (Z direction), but is a notch of about half the height of the component case 5616 . A portion of the component case 5616 above the component case notch 5617 (in the +Z direction) is hereinafter referred to as a “stopper portion” 5618 .

When the back case 521 and the detector main body 504 are combined, the battery holding spring 548 is inserted into the component case notch 5617, and the stopper portion 5618 is interposed inside the biasing space 549 of the battery holding spring 548. do. By interposing the stopper portion 5618 inside the urging space 549 in this way, the stopper portion 5618 restricts the bending of the battery retaining spring 548 inward (+X direction). It is possible to prevent plastic deformation due to excessive bending of 548 . As described above, in the fifth embodiment, the battery holding spring 548 is not provided integrally with the stopper portion 5618 in the back case 521 , but is provided in the detector main body 504 separated from the back case 521 . Therefore, compared to the case where the battery holding spring 548 is provided in the component case 5616 of the back case 521, the tip position (the position of the end in the -X direction) of the battery holding spring 548 can be held inward (+X direction). Component case 5616 can be made smaller. By reducing the size of the component case 5616, which is a component that obstructs the airflow to the detection space 534, the airflow to the detection space 534 can be increased and the detection accuracy can be improved. In addition, by forming a part such as the battery holding spring 548 that always receives stress from the battery when the battery is housed in the detection unit main body 504 that cannot be visually recognized from the outside, the battery holding spring 548 is formed in the case 502 . It is possible to prevent poor appearance due to deformation due to the stress.

(Structure - Details - Detector main body - Speaker housing)
The speaker housing portion 545 is housing means for housing a speaker for outputting an alarm, and is housing means formed integrally with the detection portion main body 504 . The speaker housing portion 545 is a plate-shaped member formed at a position corresponding to the speaker in the detection portion main body 504 and protruding downward (-Z direction). It is an annular member. Here, "slightly larger" means any size as long as it can accommodate at least the speaker. Any size is acceptable. Here, as shown in FIG. 50, a plurality of speaker holes are formed at the position where the speaker housing portion 545 is formed in the detector main body 504, and the alarm sound emitted from the speaker is transmitted through the speaker holes. It is designed to flow upward (+Z direction) as well.

(Configuration - Details - Arrangement recess)
Next, the details around the placement recess 5431 in the detector main body 504 will be described. 52 is a cross-sectional view along line BB of FIG. 32, and FIG. 53 is a cross-sectional view along line CC of FIG. As shown in FIGS. 52 and 53 and FIGS. 45 to 47 described above, the upper surface (the surface on the +Z side) of the detection unit main body 504 generally includes a light emitting recess 5432, a light receiving recess 5433, A groove portion 5434 and an outer edge wall 5435 are provided, and as shown in FIG. is provided with a light shielding frame portion 5438 . In FIG. 53, the optical axis of the light-emitting portion 552 is indicated by a one-dot chain line, and the optical axis of the light-receiving portion 553 is indicated by a two-dot chain line.

(Structure-Details-Arrangement concave portion-Light emitting concave portion)
The light-emitting recess 5432 is detection accuracy reduction suppression means for suppressing deterioration in detection accuracy due to dust being positioned on the optical axis of the light-emitting section 552 . Specifically, the light emitting recess portion 5432 is a recess integrally formed with the placement recess portion 5431 at a position closer to the light emitting portion 552 than the center of the placement recess portion 5431. In Embodiment 5, as shown in FIG. 53, the recess has a trapezoidal cross-sectional view with an inclined surface on the outermost surface.

Here, a light emitting hole 5436 penetrating through the detecting portion main body 504 is formed in this inclined portion. The light emitting hole 5436 is a hole for introducing light from the light emitting section 552 into the detection space 534 through the detection section main body 504 . Specifically, it is a hole provided on the optical axis of the light emitting portion 552 in the light emitting recess portion 5432 and is formed so as to penetrate the slope of the light emitting recess portion 5432 . The size and shape of the diameter of the light emitting hole 5436 are arbitrary as long as the light from the light emitting unit 552 can be introduced into the detection space 534. Appropriate size and shape can be determined by, for example.

Returning to the description of the light emitting recess portion 5432, by providing the light emitting recess portion 5432 in this way and recessing the position inside the light emitting hole 5436 (the right side in FIG. Even if dust accumulates to some extent, the accumulated dust will not be positioned on the optical axis until the accumulated dust reaches the height of the light emitting hole 5436 . Therefore, it is possible to prevent a decrease in detection accuracy caused by dust being positioned on the optical axis of the light emitting unit 552 . Here, it is preferable that the depth of the light emitting depression 5432 is as deep as possible in order to prevent deterioration of detection accuracy due to accumulation of dust. That is, if the light emitting recess 5432 is shallow, even if dust accumulates slightly on the bottom surface of the light emitting recess 5432, the dust will be positioned on the optical axis of the light emitting part 552, and the light will be reflected by the dust. However, by deepening the light emitting recess 5432 to allow a large amount of dust to accumulate, such a situation can be prevented. However, if it is too deep, the overall thickness of the detector main body 504 will increase, and the overall size of the alarm device 5100 will increase, which is not preferable. In addition, in this fifth embodiment, a recess having a depth of about 3 mm is presented.

(Structure-Details-Arrangement concave portion-Light receiving concave portion)
The light-receiving recess 5433 is detection accuracy reduction suppressing means for suppressing deterioration in detection accuracy caused by dust being positioned on the optical axis of the light-receiving unit 553 . Specifically, the light-receiving recess 5433 is a recess integrally formed with the arrangement recess 5431 at a position closer to the light-receiving part 553 than the center of the arrangement recess 5431, and may have any specific shape. In Embodiment 5, as shown in FIG. 50, the recess has a trapezoidal cross-sectional view with the outermost surface being a slope.

Here, a light receiving hole 5437 is formed in this inclined portion. This light receiving hole 5437 is a hole for introducing light from the detection space 534 to the light receiving section 553 through the detection section main body 504 . Specifically, it is a hole provided on the optical axis of the light receiving portion 553 in the light receiving recess portion 5433 and is formed so as to penetrate the slope of the light receiving recess portion 5433 . The size and shape of the diameter of the light receiving hole 5437 are arbitrary as long as light can be introduced into the light receiving section 553. (reference numeral omitted) may be formed in the same size and shape.

Returning to the description of the light-receiving recess 5433, the light-receiving recess 5433 is provided in this way, and by recessing the position inside the light-receiving hole 5437 (left side in FIG. Even if dust accumulates to some extent, the accumulated dust will not be positioned on the optical axis until the accumulated dust reaches the height of the light receiving hole 5437 . Therefore, it is possible to prevent a decrease in detection accuracy caused by dust being positioned on the optical axis of the light receiving unit 553 . Here, the depth of the light-receiving recess 5433 is preferably as deep as the light-receiving recess 5432 described above in order to prevent deterioration in detection accuracy due to accumulation of dust. In addition, in this fifth embodiment, a recess having a depth of about 3 mm is presented.

(Structure - Details - Arrangement recess - Groove)
The groove portion 5434 is formed around the light emitting hole 5436 and the light receiving hole 5437 on the surface of the detection portion main body 504 facing the detection space 534, and is a groove recessed toward the side opposite to the detection space 534. be. Specifically, the groove portion 5434 is a groove integrally formed with the placement recess portion 5431 so as to cover the periphery of the light emitting recess portion 5432 and the light receiving recess portion 5433. This is the portion that is one step lower toward the side opposite to the detection space 534 (that is, the bottom side). By providing the groove portion 5434 which is one step lower in the arrangement recess portion 5431 in this way, dust that has entered the detection space 534 accumulates in the groove portion 5434, so that the dust is not piled high on the surface of the element cover 546. can be prevented. Therefore, it is possible to prevent the accumulation of dust from being positioned on the optical axis of the light emitting unit 552 and the light receiving unit 553, thereby preventing the detection accuracy from deteriorating. Note that the depth of the groove portion 5434 is arbitrary, but may be, for example, about 1 mm to 2 mm.

(Structure - Details - Arrangement recess - Outer edge wall)
The outer edge wall 5435 is a wall portion raised from the detection portion main body 504 toward the detection space 534 side around the light emitting recess portion 5432 and the light receiving recess portion 5433 on the detection space 534 side surface of the detection portion main body 504 . . Specifically, the outer edge wall 5435 is a resin wall provided on the surface of the groove portion 5434, and along the outer edge of the light emitting recess portion 5432 and the light receiving recess portion 5433 on the mounting surface side (that is, the upper surface side). It is a formed wall. The thickness of the outer edge wall 5435 is arbitrary as long as sufficient strength can be maintained, but in the fifth embodiment, it exhibits a plate-like body with a thickness of about 1 mm. In addition, the height of the outer edge wall 5435 is arbitrary as long as it does not interfere with the optical axis. It does not matter if they are formed.

By providing the outer edge wall 5435 in this way, the outer edge wall 5435 is positioned between the light emitting portion 552 and the light receiving portion 553 as shown in FIG. It is possible to prevent erroneous detection. In addition, the outer edge wall 5435 can prevent dust accumulated in the groove portion 5434 from falling to the light emitting portion 552 and the light receiving portion 553 through the light emitting hole 5436 and the light receiving hole 5437. It is possible to prevent the detection accuracy from deteriorating due to accumulation of dust on the surface of the sensor. Furthermore, dust accumulated in the groove portion 5434 can be prevented from falling from the groove portion 5434 and accumulating on the bottom surface of the light emitting recess portion 5432 or the light receiving recess portion 5433 . It is possible to prevent the deterioration of the detection accuracy caused by the dust accumulated on the bottom surface of the light emitting unit 552 and the light receiving unit 553 being positioned on the optical axis.

(Configuration - Details - Arrangement recess - Light shielding frame)
The light shielding frame portion 5438 is light shielding means formed around the light emitting hole 5436 or the light receiving hole 5437 on the surface of the detection unit main body 504 facing the circuit board 551, and is arranged so as to rise toward the board. , light shielding means for covering the periphery of the light emitting portion 552 and the light receiving portion 553 . Specifically, the light-shielding frame portion 5438 is a frame-shaped body having an open bottom surface, and is formed so as to protrude downward from the bottom surface (the surface in the −Z direction) of the detection portion main body 504 . When the detector main body 504 and the circuit board 551 are combined, the light emitting part 552 and the light receiving part 553 attached to the circuit board 551 are accommodated inside the light shielding frame part 5438, and the light emitting part 552 and the light receiving part 553 It is arranged so as to cover the front, rear, left, and right of the portion 553 .

In this way, by covering the light-emitting portion 552 and the light-receiving portion 553 with the light-shielding frame portion 5438, detection is performed from the light-emitting portion 552 to the light-receiving portion 553 without going through the detection space 534 (that is, by going around below the detection portion main body 504). It is possible to prevent the light from reaching and allow the light to pass through the correct route (the route from which the light from the light emitting part 552 reaches the light receiving part 553 sequentially through the light emitting hole 5436, the detection space 534, and the light receiving hole 5437), False detection can be prevented. In Embodiment 5, the light-shielding frame portion 5438 has a shape that covers both the light-emitting portion 552 and the light-receiving portion 553. However, the shape is not limited to this, and may have a shape that covers only one of them.

(Configuration - Details - Circuit board)
Next, details of the circuit board 551 will be described. 54 is a perspective view of the circuit board 551. FIG. As shown in FIG. 54, the circuit board 551 generally includes a light emitting portion 552, a light receiving portion 553, a shield 554, and a board hole 556. As shown in FIG.

First, the light emitting portion 552 is a light emitting means (light emitting side detecting means) that emits light to the detection space 534, and is a light projecting means that projects light in the direction toward the mounting surface of the alarm device 5100. It is formed as a light-emitting diode, and is mounted on the circuit board 551 with two connection lines (legs) bent at a predetermined angle, thereby determining an optical axis at a predetermined angle.

Further, the light receiving section 553 is a light receiving means for receiving the reflected light of the light projected from the light emitting section 552 into the detection space 534, and determines whether or not the substance to be detected is contained based on the light quantity of the received light. It is a light receiving means (light receiving side detection means) for detecting whether or not, is formed as a known photodiode, and is integrally formed with the shield 554 .

The shield 554 is a noise prevention means for preventing noise from entering the light receiving section 553, and is integrally formed with the light receiving section 553 so that the light receiving section 553 faces in a predetermined direction. It is a noise prevention means for determining the axis. Specifically, the shield 554 is arranged on the upper side (+Z direction) of the circuit board 551 so as to face the light emitting section 552, and the bottom surface of the shield 554 is parallel to the circuit board 551. The surface of 554 facing the light emitting unit 552 is an inclined surface (the surface on which the light receiving unit 553 is mounted) inclined by a predetermined angle from the vertical, and the bottom surface and the inclined surface form an acute angle. That is, when the shield 554 is mounted on the circuit board 551 , the optical axis of the light receiving section 553 is determined by the shape of the shield 554 .

Further, the board hole 556 is a hole provided at a position corresponding to the bent portion of the light emitting section 552, through which an optical axis adjustment pin 5701 for determining the mounting angle of the light emitting section 552 with respect to the circuit board 551 is inserted. possible holes. Specifically, the substrate hole 556 is a hole formed on the light receiving unit 553 side from the attachment position of the connection line of the light emitting unit 552, and the shape and diameter of this hole are as long as the optical axis adjustment pin 5701 can be inserted. Although arbitrary, in the fifth embodiment, the holes are circular with a diameter of about 5 mm. Here, the “optical axis adjustment pin” 5701 is an angle determining tool used when determining the mounting angle of the light emitting unit 552 with respect to the circuit board 551, and is a concept including, for example, any rod-shaped jig. Since the surface of the light emitting portion 552 facing the substrate hole 556 is curved, the tip of the optical axis adjustment pin 5701 should be a concave surface having a shape corresponding to the curved surface so that the light emitting portion 552 can be easily held. is preferred.

(Composition - Details - Front case)
Next, details of the front case 522 will be described. Here, the upper surface (surface on the +Z direction side) of the front case 522 is formed with a closing protrusion 5226 (see FIGS. 35 and 41) that protrudes upward (+Z direction). The blocking protrusion 5226 is a blocking means for blocking the substrate hole 556 with the light emitting section 552 , the light receiving section 553 and the detection section main body 504 accommodated, and a support means capable of supporting the light emitting section 552 . Specifically, the blocking protrusion 5226 is provided at a position corresponding to the board hole 556 of the circuit board 551 in the front case 522 (position directly below the board hole 556 (−Z direction)). It is a projection having a diameter that allows it to be inserted into. Here, the term “insertable” means having an outer diameter smaller than the inner diameter of the substrate hole 556 , but the outer diameter is preferably close to the inner diameter of the substrate hole 556 . By closing the board hole 556 with the blocking protrusion 5226 in this way, it is possible to prevent the light from the light emitting part 552 from passing through the board hole 556 and going around below the circuit board 551 (in the −Z direction). 553 can reduce the possibility of erroneously detecting the generation of smoke due to the reflected light. Furthermore, when visible light is used as the light of the light emitting part 552 , it is possible to prevent the visible light from entering the front case 522 through the substrate hole 556 , thereby preventing appearance defects.

Here, the height (length in the Z direction) of the blocking protrusion 5226 is at least such a length that the tip of the blocking protrusion 5226 can be inserted through the board hole 556 when the circuit board 551 is installed in the front case 522 . The length is arbitrary as long as it has a length, but it is more preferable that the length is enough to support the light emitting portion 552 . The phrase “capable of supporting the light emitting unit 552” means that the connection line of the light emitting unit 552 can be prevented from being bent when the light emitting unit 552 is subjected to an impact or the like by supporting the light emitting unit 552. For example, since the tip of the blocking projection 5226 interferes with the light emitting part 552, the light emitting part 552 is fixedly supported, or the tip of the blocking projection 5226 does not interfere with the light emitting part 552, so that the light emitting part 552 Positioning slightly downward (−Z direction) prevents bending of the light emitting portion 552 beyond the allowable range. Note that the tip shape of the closing protrusion 5226 is arbitrary, and for example, it may have a concave shape corresponding to the curved surface shape so as to easily support the light emitting portion 552 having a curved surface shape.

(Mounting method for circuit board)
Next, a mounting method for mounting the light emitting portion 552, the light receiving portion 553, and the shield 554 on the circuit board 551 according to the fifth embodiment will be described.

First, the configuration of the mounting jig 5700 used in the mounting method will be briefly described. FIG. 55 is a cross-sectional view showing the circuit board 551 and the mounting jig 5700. As shown in FIG. As shown in FIG. 55, the mounting jig 5700 includes a base 5710 and an upper lid 5720, and is configured such that a circuit board 551 can be interposed between the base 5710 and the upper lid 5720. As shown in FIG.

First, the configuration of the base 5710 will be described. The base 5710 has a light emitter pocket 5711 and a light receiver pocket 5712 .

The light-emitting portion pocket 5711 is a concave portion having a size and a shape capable of accommodating the light-emitting portion 552. When the light-emitting portion 552 is accommodated in the light-emitting portion pocket 5711, the positional relationship between the light-emitting portion 552 and the circuit board 551 is This is the positional relationship when the light emitting section 552 is finally mounted on the circuit board 551 . Here, the bottom surface (+Z direction end surface) of the light emitting portion pocket 5711 has a slope shape with an angle corresponding to the bending angle of the connection line of the light emitting portion 552 (angle parallel to the optical axis of the light emitting portion 552). . The reason for having such a slope shape will be described later.

Further, the light receiving portion pocket 5712 is a concave portion having a size and a shape capable of accommodating the shield 554 integrally formed with the light receiving portion 553. When the light receiving portion pocket 5712 accommodates the light receiving portion 553 (and the shield 554) , the positional relationship between the light receiving portion 553 and the circuit board 551 is the positional relationship when the light receiving portion 553 is finally mounted on the circuit board 551 . Here, the bottom surface (+Z direction end surface) of the light receiving portion pocket 5712 has a slope shape with an angle corresponding to the angle of inclination of the shield 554 . The reason for having such a slope shape will be described later.

Here, the light receiving portion 553 is pressed against the circuit board 551 while the light receiving portion 553 is accommodated in the light receiving portion pocket 5712 . Specifically, the base 5710 is provided with an urging hole 5716. A slide member 5713 is housed in the urging hole 5716 so as to be slidable up and down. It is formed at the -Z direction end of 5713 . A spring 5714 is arranged on the bottom surface (+Z direction end face) of the biasing hole 5716 to bias the slide member 5713 in the direction (−Z direction) toward the circuit board 551. The light-receiving part 553 accommodated in the inner pocket 5712 is pressed against the circuit board 551 . The specific method of pressing the light receiving portion 553 against the circuit board 551 is not limited to this, and for example, an elastic member such as rubber may be applied instead of the spring 5714 described above.

Next, the configuration of the upper lid 5720 will be described. The upper lid 5720 is attached to the base 5710 as a whole so as to be rotatable with one end as a base point. A plane-shaped exposure hole 5721 slightly smaller than the circuit board 551 is provided in the central portion of the upper lid 5720 in plan view. The vicinity of the center of 551 (the portion including the above-described light emitting portion pocket 5711 and light receiving portion pocket 5712) is exposed to the outside (see FIG. 59, which will be described later), and the outer edge portion of circuit board 551 is held down and fixed by upper lid 5720. .

A mounting method using the mounting jig 5700 as described above will be described below. FIG. 56 is a perspective view showing the mounting jig 5700 in the initial state. In this state, the upper lid 5720 is open. FIG. 57 is a perspective view showing the mounting jig 5700 in which the light emitting portion 552, the light receiving portion 553, and the shield 554 are arranged on the mounting jig 5700. FIG. Thus, first, the light emitter 552 is accommodated inside the light emitter pocket 5711 , and the shield 554 (the shield 554 integrally formed with the light receiver 553 ) is accommodated inside the light receiver pocket 5712 . Here, the light-emitting portion 552 is housed in a state in which the connection line of the light-emitting portion 552 is bent at a predetermined angle using another known jig (forming jig or the like) in advance. As described above, the bottom surface (+Z direction end surface) of the light emitting pocket 5711 is sloped, and when the light emitting part 552 is housed, the light emitting part 552 is arranged at a predetermined angle. Since the angle of the slope of the bottom surface (+Z direction end surface) corresponds to the bending angle of the connecting line, the connecting line of the light emitting section 552 is arranged along the vertical direction when the light emitting section 552 is accommodated. In addition, the +Z direction end of the shield 554 has a sloped shape as described above, and the bottom surface (+Z direction end face) of the light receiving portion pocket 5712 also has a sloped shape corresponding to this shape, so that the shield 554 can be accommodated. When this is done, the end face of the shield 554 on the side of the circuit board 551 (the end face in the −Z direction) becomes horizontal along the circuit board 551 .

Subsequently, the circuit board 551 is placed on the base 5710 of the mounting jig 5700 (the light emitting unit 552 and the light receiving unit 553 for detecting whether or not the gas flowing into the detection space 534 contains the substance to be detected are mounting step of mounting the element at a predetermined angle to the circuit board 551 on which the element can be mounted). FIG. 58 is a perspective view showing the mounting jig 5700 on which the circuit board 551 is placed. Here, the mounting jig 5700 is formed with positioning projections 5715 , and the circuit board 551 is placed so that the positioning projections 5715 penetrate through the positioning holes 557 formed in the circuit board 551 . Thus, the position of the circuit board 551 with respect to the base 5710 can be uniquely determined. At this time, connection wires of the light emitting portion 552 , the shield 554 and the light receiving portion 553 are inserted through the through holes provided in the circuit board 551 .

Subsequently, the circuit board 551 is fixed by closing the upper lid 5720 . FIG. 59 is a perspective view showing the mounting jig 5700 with the upper lid 5720 closed. In order to further prevent the circuit board 551 from moving, the upper lid 5720 may be held down with a known pin or the like.

Finally, in the state shown in FIG. 59, the light-emitting portion 552, the light-receiving portion 553, and the shield 554 are electrically mounted on the circuit board 551 (the light-emitting portion 552 and the light-receiving portion 553 attached to the circuit board 551 in the mounting step are mounted). is electrically mounted on the circuit board 551 while maintaining a predetermined angle (angle at the time of attachment). As shown in the drawing, a portion of the circuit board 551 is exposed through the exposure hole 5721 of the upper lid 5720, so that even when the upper lid 5720 is closed, soldering or the like can be performed directly on the circuit board 551. Specifically, first, an optical axis adjustment pin 5701 (see FIG. 55) is inserted into a board hole 556 provided in the circuit board 551, and the light emitting part 552 is pressed against the +Z direction end face of the light emitting part pocket 5711 and fixed. In this state, the connection line of the light emitting part 552 protruding from the through hole of the circuit board 551 is soldered to the circuit board 551 for mounting. In this manner, the light emitting portion 552 is obliquely pressed inside the light emitting portion pocket 5711 by the pressing force of the optical axis adjustment pin 5701, so that the installation position and angle are uniquely determined. Subsequently, the connection line of the light receiving section 553 projecting from the through hole of the circuit board 551 is soldered to the circuit board 551 for mounting. Note that the installation position and angle of the light receiving unit 553 are uniquely determined by pressing the light receiving unit 553 against the circuit board 551 with the biasing force in the -Z direction as described above.

The description of the mounting method for mounting the light-emitting portion 552, the light-receiving portion 553, and the shield 554 on the circuit board 551 is completed. Then, the detection unit main body 504 interposed between the circuit substrate 551 and the detection space 534 is installed so as to cover the circuit substrate 551 and the light emitting unit 552 and the light receiving unit 553 mounted on the circuit substrate 551 (covering means installation step (see FIG. 35, etc.), and by storing each component between the cases 502, the alarm device 5100 can be manufactured.

(Effect of Embodiment 5)
As described above, according to the fifth embodiment, the detection unit body 504 does not interfere with the circuit board 551, the light emitting unit 552, and the light receiving unit 553. After that, the work of covering the detection unit main body 504 with the circuit board 551 and simultaneously inserting the connection wires of the light emitting unit 552 and the light receiving unit 553 into the through holes of the circuit board 551 can be omitted, and the light emitting unit 552 and the light receiving unit 553 are mounted. In addition to simplifying the work, it is no longer necessary to provide a mechanism for attaching the light-emitting portion 552 and the light-receiving portion 553 to the detection portion main body 504, and the mechanism of the detection portion main body 504 is simplified, thereby improving the productivity of the alarm device 5100. can be improved.

Further, since the detecting means includes the light receiving portion 553 and the shield 554 is integrally formed with the light receiving portion 553, the work of mounting the light receiving portion 553 and the shield 554 can be simplified, It is no longer necessary to provide a mechanism for attaching the 553 and the shield 554 to the detection unit main body 504, so that the mechanism of the detection unit main body 504 can be simplified and the productivity of the alarm device 5100 can be improved.

In addition, since the outer edge of the detector main body 504 is provided with the flange portion 541 for promoting the inflow of gas into the detection space 534, the amount of gas flowing into the detection space 534 can be increased, and the detection accuracy can be improved. It becomes possible.

In addition, since the battery holding spring 548 to which the stress from the power source always acts is integrally formed with the detection unit main body 504, which is invisible from the outside, it is less likely to be provided in a mechanism visible from the outside like the case 502. Therefore, the deformation caused by the stress becomes inconspicuous, and the poor appearance can be prevented.

Further, since the speaker housing portion 545 for housing the speaker connected to the circuit board 551 is formed integrally with the detection portion main body 504, the output means can be arranged on the same side as the circuit board 551 in the detection portion main body 504, and the speaker can be mounted. The productivity of the alarm device 5100 can be improved by simplifying the connection to the circuit board 551 .

Further, since the circuit board 551 is provided with a board hole 556 through which the optical axis adjusting pin 5701 can be inserted, the mounting angle of the light emitting part 552 can be adjusted by an extremely easy method of inserting the optical axis adjusting pin 5701 and holding down the light emitting part 552 . It can be determined easily, and the productivity of the alarm device 5100 can be improved.

In addition, since the case 502 is provided with the blocking protrusion 5226 that closes the board hole 556, it is possible to prevent erroneous detection due to the light from the light emitting part 552 coming around from the board hole 556 and being received by the light receiving part 553. It is possible to improve detection accuracy.

In addition, since the blocking projection 5226 can support the light emitting portion 552, it is possible to prevent the angle of the light emitting portion 552 from changing when an external force is applied to the light emitting portion 552 for some reason, thereby degrading the detection accuracy. can be prevented.

Further, since the detection portion main body 504 includes the light emitting hole 5436 and the light receiving hole 5437, the circuit board 551 is covered with the detecting portion main body 504 to prevent dust from accumulating on the circuit board 551. The optical axis of the light emitting portion 552 and the light receiving portion 553 can be prevented by the 5437 .

In addition, since the groove 5434 recessed toward the opposite side of the detection space 534 is provided around the light emitting hole 5436 and the light receiving hole 5437 , the dust accumulates in the groove 5434 so that the dust rises above the detection unit main body 504 . Dust accumulated around the light emitting hole 5436 or the light receiving hole 5437 in the detection unit main body 504 is positioned on the light emitting axis or the light receiving axis, thereby degrading the detection accuracy. can be prevented.

In addition, since the light-shielding frame portion 435 is provided so as to rise around the light-emitting hole 5436 or the light-receiving hole 5437 and covers the light-emitting portion 552 or the light-receiving portion 553, the light from the light-emitting portion 552 is blocked by the detection space 534. In addition to preventing erroneous detection due to direct light being received by the light receiving portion 553 without passing through the light receiving portion 553, dust accumulated in the detection portion main body 504 is discharged from the detection portion main body 504 through the light emitting hole 5436 and the light receiving hole 5437 to the light emitting portion. It is possible to prevent a situation in which detection accuracy is lowered by falling on the surface of the light emitting unit 552 or the light receiving unit 553 and accumulating on the surface of the light emitting unit 552 or the light receiving unit 553 .

In addition, since the light emitting portion 552 and the light receiving portion 553 are attached to the circuit board 551 and electrically mounted, the detecting portion main body 504 is installed. Therefore, it is possible to omit the operation of covering the detection unit main body 504 with the circuit board 551 and simultaneously inserting the connection wires of the light emitting unit 552 and the light receiving unit 553 into the through holes of the circuit board 551, and mounting work of the light emitting unit 552 and the light receiving unit 553. can be simplified, and there is no need to provide a mechanism for attaching the light emitting unit 552 and the light receiving unit 553 to the detection unit main body 504, and the mechanism of the detection unit main body 504 is simplified to improve the productivity of the alarm device 5100. It becomes possible to

(Modification of Embodiment 5)
The fifth embodiment according to the present invention has been described above, but the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical ideas of each invention described in the claims. can be done. Such modifications will be described below.

(Problem to be solved and effect of invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the contents described above, and may differ depending on the details of the implementation environment and configuration of the invention. or only part of the effects described above.

(Regarding decentralization and integration)
Moreover, the configuration described above is functionally conceptual, and does not necessarily have to be physically configured as illustrated. That is, the specific form of distribution or integration of each part is not limited to the illustrated one, and all or part of them can be functionally or physically distributed or integrated in arbitrary units. For example, the case 502 and the mounting base 501 of the alarm device 5100 may be configured integrally, and this integral configuration may be directly attached to the installation surface of the monitoring area.

(Regarding the optical axis adjustment pin)
In the fifth embodiment, the optical axis adjusting pin 5701 is inserted into the substrate hole 556 to fix the light emitting portion 552, and in the fixed state, soldering is performed, and then the optical axis adjusting pin 5701 is removed. Alternatively, the optical axis adjustment pin 5701 may be adhered to the circuit board 551 by a known method.

(Regarding the mounting jig)
In the fifth embodiment, the mounting jig 5700 has a structure in which the upper cover 5720 is rotatably attached to the base 5710 and the circuit board 551 is sandwiched between the base 5710 and the upper cover 5720. However, the circuit board 551 can be fixed. For example, the upper lid 5720 may be omitted, a member (such as a hook) capable of fixing the circuit board 551 to the base 5710 may be provided, or the circuit board 551 may be attached to the base 5710. Alternatively, the circuit board 551 may be fixed by being fitted into the base 5710 .

[Appendix]
The device mounting structure according to appendix 1 is a device mounting structure in which a device body is mounted to an installation surface by means of a mounting plate, wherein the mounting plate has screw holes through which screws are inserted for fixing to the installation surface. A raised portion having a height equal to or higher than the head of the screw is formed around the screw hole.
The device mounting structure according to Appendix 2 is the device mounting structure according to Appendix 1, wherein the mounting plate has a device fixing surface for fixing the device main body, and the device main body is engaged with the device fixing surface. It is characterized in that the locking piece portion and the screw hole portion are formed, and the rising portion is formed so as to rise from the device fixing surface portion.
The device mounting structure according to Appendix 3 is the device mounting structure according to Appendix 1 or 2, wherein the device body has a battery housing section for housing a battery, the battery housing section is open toward the mounting plate, and the The screw hole is formed at a position facing the battery housing.
The device mounting structure according to Appendix 4 is the device mounting structure according to any one of Appendixes 1 to 3, wherein the device body is a fire alarm that detects the occurrence of a fire and issues an alarm.
The mounting plate according to Supplementary Note 5 is a mounting plate for mounting a device main body to an installation surface, wherein the mounting plate has a screw hole portion through which a screw for fixing to the installation surface is inserted, and the screw is inserted into the mounting plate. A raised portion having a height equal to or higher than the head of the screw is formed around the hole.
The mounting plate according to appendix 6 is the mounting plate according to appendix 5, wherein the mounting plate has a device fixing surface portion for fixing the device main body, and the device fixing surface portion has a locking portion for locking the device main body. A piece portion and the screw hole portion are formed, and the rising portion is formed so as to rise from the device fixing surface portion.
The alarm device according to appendix 7 is an alarm device having a speaker that emits sound from the front inside a housing, wherein the housing has a substrate part having a speaker fixing part for fixing the speaker, and the housing An acoustic hole is formed at a position facing the front surface of the speaker, and the speaker fixing portion includes a base surface portion facing the back surface of the speaker and an engaging portion that is engaged with the peripheral portion of the speaker. and the base portion has one or more penetrations.
The alarm device according to appendix 8 is the alarm device according to appendix 7, wherein the substrate portion is housed in the hollow interior of the housing, and a space is formed between the substrate portion and the rear surface portion of the housing. and the space is closed at least on the rear surface side of the housing.
The alarm device according to appendix 9 is the alarm device according to appendix 7 or 8, wherein the locking portion comprises a plurality of locking pieces provided along the circumferential direction of the speaker formed in a substantially circular shape. Characterized by
The alarm device according to appendix 10 is the alarm device according to appendix 7 or 8, wherein the locking portion comprises a pair of locking pieces that are formed in a substantially circular shape and face each other in a diametrical direction of the speaker. Characterized by
The alarm device according to appendix 11 is the alarm device according to appendix 9 or 10, wherein the locking piece portion includes a fixed locking piece portion fixed to the substrate portion and an elastically movable relative to the substrate portion. and a moving locking piece.
The alarm device according to appendix 12 is characterized in that, in the alarm device according to appendix 11, the moving locking piece portion is formed as an elastic piece that is cantilevered on the base surface portion.
The alarm device according to appendix 13 is characterized in that, in the alarm device according to any one of appendices 7 to 12, the penetrating portion comprises a plurality of small holes formed in the base surface portion.
The alarm device according to appendix 14 is the alarm device according to appendix 11, wherein the moving locking piece portion is elastically deformable by two slit portions extending from one end of the base surface portion to at least a position exceeding the center of the base surface portion. It is characterized in that it is formed in an elastic piece having a shape, and the slit portion serves as the through portion.
The alarm device according to appendix 15 is the alarm device according to appendix 11, wherein the movable locking piece portion is formed in an island-shaped portion connected to the substrate portion by a narrow-diameter bridge portion. A gap between the island-shaped portion and the base surface portion is the penetrating portion.
The alarm device according to appendix 16 is an alarm device having a housing and an operation button provided in the housing and capable of pressing and returning operations, wherein the operation button has a rotating shaft portion on an outer peripheral portion, and The housing has an opening for receiving the operation button, and a bearing for holding the rotating shaft at the edge of the opening, and the operation button returns to the housing. It is characterized by having a locking portion that is locked in a state of being biased in the operating direction.
The alarm device according to appendix 17 is the alarm device according to appendix 16, wherein the operation button is provided with the rotating shaft portion near one end, and is long from the one end where the rotating shaft portion is provided toward the other end. It is characterized by having a shape.
The alarm device according to appendix 18 is the alarm device according to appendix 16 or 17, wherein the operation button includes an operation portion exposed from the opening and an outwardly extending portion extending outward from one end of the operation portion. and a portion, and the rotating shaft portion is provided in the outwardly extending portion.
The alarm device according to appendix 19 is the alarm device according to appendix 18, wherein the operation button extends in the same direction as the outwardly extending portion from one end portion of the operating portion and is parallel to the outwardly extending portion. An elastic piece is provided, and the locking portion is formed at the tip of the elastic piece.
The alarm device according to attachment 20 is the alarm device according to any one of attachments 16 to 19, wherein the operation button has a rearwardly extending portion extending rearward, and the rearwardly extending portion is pulled. It has a slit through which the string is inserted, and the slit is deformable in a direction in which the width increases.
The fire alarm according to appendix 21 is a fire alarm having a smoke detection part in a housing, wherein the smoke detection part is provided with a smoke detection part cover so as to surround a smoke detection area in which the sensor part is arranged, The smoke detection section cover has a plurality of light shielding walls along the circumferential direction, the light shielding walls having a single plate shape, and the adjacent light shielding walls communicating between the inside and outside of the smoke detection area. A gap is formed, and the light shielding wall portions are arranged so as to overlap each other in the radial direction so that one of the light shielding wall portions is positioned on the radiation centered on the detection position of the sensor portion. It is characterized by
The fire alarm according to appendix 22 is the fire alarm according to appendix 21, wherein the light shielding wall portion is inclined radially along the circumferential direction of the smoke detection area from the base of the smoke detection section cover. It is characterized by being placed and erected in the
The fire alarm according to appendix 23 is characterized in that, in the fire alarm according to appendix 21 or 22, the light shielding wall portion has an arcuate surface portion forming an outer peripheral surface of the smoke detection area.
The fire alarm according to appendix 24 is the fire alarm according to any one of appendices 21 to 23, wherein a light emitting unit is arranged in the smoke detection area, and at least the light from the light emitting unit is emitted from the light shielding wall. The light-receiving surface is characterized by having an uneven shape.
The alarm device according to appendix 25 includes a substrate on which an element can be mounted, and detection means electrically mounted on the substrate, and detects whether or not the gas flowing into the detection space contains the substance to be detected. and covering means arranged to cover the substrate and the detecting means without interfering with the detecting means, the covering means being interposed between the substrate and the detecting space. and a covering means.
The alarm device according to appendix 26 is the alarm device according to appendix 25, wherein the detection means includes light receiving means for detecting whether or not a substance to be detected is contained based on the amount of light received, The alarm device is noise prevention means for preventing noise to the light receiving means, and is fixed to the light receiving means so that the light receiving means faces a predetermined direction, thereby preventing the optical axis of the light receiving means from A deterministic noise prevention means is provided.
The alarm device according to appendix 27 is the alarm device according to appendix 25 or 26, wherein the flange for promoting the inflow of the gas into the detection space is integrally formed on the outer edge of the covering means. Equipped with a flange.
The alarm device according to Supplementary Note 28 is, in the alarm device according to any one of Supplementary Notes 25 to 27, power urging means for energizing and holding a power supply unit that supplies power to the alarm device. and power biasing means integrally formed with the covering means.
The alarm device according to appendix 29 is, in the alarm device according to any one of appendices 25 to 28, housing means for housing output means for outputting an alarm, wherein the housing means is formed integrally with the covering means. Prepare.
The alarm device according to appendix 30 is the alarm device according to any one of appendices 25 to 29, wherein the detection means is light emitting means for emitting light to the detection space, Equipped with a light emitting means arranged in a state of being bent in a predetermined direction,
The substrate has a substrate hole provided at a position corresponding to the bent portion of the light emitting means, the substrate hole allowing insertion of an angle determination tool for determining the mounting angle of the light emitting means with respect to the substrate. .
The alarm device according to appendix 31 is, in the alarm device according to appendix 30, housing means for housing the detecting means and the covering means, wherein the board is mounted in a state where the detecting means and the covering means are accommodated A containment means having closure means for closing the aperture is provided.
The alarm device according to appendix 32 is the alarm device according to appendix 31, wherein the blocking means is support means capable of supporting the detection means.
The alarm device according to appendix 33 is the alarm device according to any one of appendices 25 to 32, wherein the detection means includes light-emitting side detection means that emits light into the detection space, and light intensity of the received light. light-receiving side detection means for detecting whether or not the substance to be detected is contained in the gas flowing into the detection space according to the and a light-receiving hole for introducing reflected light from the detection space through the covering means to the light-receiving side detection means.
The alarm device according to appendix 34 is the alarm device according to appendix 33, wherein the groove is formed around the light-emitting hole or the light-receiving hole on a surface of the covering means facing the detection space, It has a groove recessed toward the side opposite to the detection space.
The alarm device according to appendix 35 is, in the alarm device according to appendix 33 or 34, light shielding means formed around the light emitting hole or the light receiving hole on the surface of the covering means facing the substrate, and a light shielding means arranged so as to rise toward the substrate and covering the periphery of the light emitting side detecting means or the light receiving side detecting means.
The method for manufacturing an alarm device according to appendix 36 includes mounting the detection means for detecting whether or not the gas flowing into the detection space contains the substance to be detected at a predetermined angle with respect to the substrate on which the element can be mounted. a mounting step of electrically mounting the detecting means attached to the substrate in the mounting step to the substrate while maintaining the predetermined angle; and a covering means installation step of installing covering means interposed between the substrate and the detection space so as to cover the mounted detection means.

[Effect of supplementary notes]
According to the invention according to Supplementary Note 1, even if an object approaches the head of the screw from the front, it is possible to prevent the object from contacting the head of the screw by coming into contact with the rising portion.
Also, it is possible to prevent the head of the screw of the mounting plate from affecting its front side. In addition, the rising portion can be used as a guide for the depth of screw tightening, and appropriate tightening depth and strength can be achieved according to the thickness of the mounting plate. can be reliably fixed to the installation surface.
According to the invention according to Supplementary Note 2, even if the mounting plate side of the device body approaches the head of the screw, it abuts the rising portion and does not abut the head of the screw, so the screw affects the device body. can be prevented.
According to the invention according to Supplementary Note 3, even if the battery approaches the head of the screw, the screw contacts the rising portion and does not contact the screw head, thereby preventing the battery from being affected by the screw.
According to the invention according to Supplementary Note 4, in the fire alarm, it is possible to prevent the head of the screw from affecting the alarm main body.
According to the invention of Supplementary Note 5, even if the device main body approaches the screw head from the front, it abuts the rising portion and does not abut the screw head, so the screw head does not affect the device main body. can be prevented.
In addition, it is possible to prevent the head of the screw of the mounting plate from affecting the main body of the device. In addition, the rising portion can be used as a guide for the depth of screw tightening, and appropriate tightening depth and strength can be achieved according to the thickness of the mounting plate. can be reliably fixed to the installation surface.
According to the invention according to appendix 6, even if the mounting plate side of the device body approaches the head of the screw, it abuts the rising portion and does not abut the head of the screw, so the screw affects the device body. can be prevented.
According to the invention according to Supplementary Note 7, part of the sound generated by the vibration on the front side of the speaker can be transmitted to the back side of the speaker through the penetrating portion, and can be efficiently resonated in the housing, and the sound pressure can be reduced. can be improved.
Further, by resonating part of the sound from the speaker within the housing, the sound pressure from the speaker can be improved. As a result, even a speaker with a small diameter can obtain a predetermined sound pressure or more, so that the size of the housing can be reduced.
According to the invention of Supplementary Note 8, a closed space is formed between the substrate portion and the rear surface portion of the housing, and the sound from the speaker guided through the through portion can more easily resonate. Further improvement in pressure can be achieved.
According to the invention according to Supplementary Note 9, since the speaker is locked and fixed by the locking piece portion at a plurality of positions in the circumferential direction, the speaker can be stably fixed to the substrate portion. can be suppressed from changing the fixed state of
According to the invention according to appendix 10, since the speaker is locked and fixed so as to be sandwiched between the pair of locking pieces from both sides, the speaker can be stably fixed to the substrate and is resistant to environmental changes such as temperature and humidity. Therefore, it is possible to suppress a change in the fixed state of the speaker.
According to the invention according to Supplementary Note 11, after one end of the speaker is locked to the fixed locking piece, the other end of the speaker can be easily locked and fixed to the movable locking piece. can facilitate the fixing work.
According to the invention according to supplementary note 12, the moving locking piece can be elastically movable with a simple structure.
According to the thirteenth aspect of the present invention, it is possible to prevent insects from entering through the penetrating portion, and by blocking some of the small holes, it is possible to optimize the improvement of the sound pressure of the speaker.
According to the invention of Supplementary Note 14, the amount of deformation of the elastic piece can be increased, and locking and fixing of the speaker can be facilitated. can be simplified.
According to the invention according to Supplementary Note 15, it is possible to elastically move the moving locking piece with a simple structure, and since the gap serves as a through portion, there is no need to form a separate through portion, which simplifies the structure. can.
According to the invention of Supplementary Note 16, the operation button can be pressed so as to be tilted about the rotation shaft, and the locking portion is biased against the housing in the direction of the return movement of the operation button. The operation button can be securely fixed to the housing.
Further, the operation button can be pressed and returned with a simple structure, and since the number of parts is small, variation in pressing operation due to part tolerance can be suppressed.
According to the invention according to Supplementary Note 17, it is possible to increase the distance between the portion to be pressed and the rotating shaft portion, and to ensure a sufficient pressing depth of the operation button.
According to the eighteenth aspect of the present invention, the rotating shaft can be further separated from the operation part, and the pressing depth of the operation button can be increased.
According to the invention according to Supplementary Note 19, the operation button can be reliably operated in the return direction by elastic deformation of the elastic piece accompanying pressing of the operation button.
According to the invention according to Supplementary Note 20, when a pull cord is provided in the slit portion, when a large force is applied to the pull cord, the slit portion is deformed and the pull cord is pulled out. can be prevented from joining.
According to the invention according to Supplementary Note 21, it is possible to prevent external light from directly entering the sensor section while minimizing the diameter of the smoke detection section cover.
In addition, the smoke detector can be miniaturized while maintaining the light shielding function from external light, and the smoke detector cover can be arranged so as not to overlap with the speaker or the like in the miniaturized housing.
According to the invention according to Supplementary Note 22, it is possible to arrange adjacent light shielding wall portions so as to overlap each other in the radial direction while providing a gap between the light shielding wall portions.
According to the invention according to Supplementary Note 23, a discontinuous circumferential surface can be formed on the outer peripheral side of the light shielding wall portion, and the net member can be arranged on the outer peripheral side.
According to the invention according to Supplementary Note 24, the light from the light emitting section is scattered by the uneven shape of the light shielding wall, so that the reflected light from the light emitting section that enters the sensor section is reduced. Malfunction can be prevented.
According to the alarm device described in appendix 25, since the covering means does not interfere with the substrate and the detecting means, after all the detecting means are set on the covering means, the substrate is placed over the covering means and the through holes of the substrate are inserted. It is possible to omit the work of simultaneously inserting the connection wires of the detection means, simplify the mounting work of the detection means, and eliminate the need to provide the covering means with a mechanism for attaching the detection means, thereby eliminating the need to provide the covering means. can be simplified to improve the productivity of the alarm device.
According to the alarm device described in appendix 26, the detecting means includes the light receiving means, and the noise prevention means is integrally formed with the light receiving means. Furthermore, it is not necessary to provide the covering means with a mechanism for attaching the light receiving means and the noise preventing means to the covering means, and the mechanism of the covering means can be simplified to improve the productivity of the alarm device.
According to the alarm device described in appendix 27, since the outer edge of the covering means is provided with a flange for promoting the inflow of gas into the detection space, the amount of gas flowing into the detection space can be increased, and the detection accuracy can be improved. It is possible to
According to the alarm device described in appendix 28, the power supply urging means to which the stress from the power supply always acts is integrally formed with the covering means that is invisible from the outside, so that it is visible from the outside like the housing means. Deformation due to the stress becomes less conspicuous compared to the case of providing it in the mechanism, and it is possible to prevent appearance defects.
According to the alarm device described in Supplementary Note 29, since the housing means for housing the output means connected to the substrate is formed integrally with the covering means, the output means can be arranged on the same surface side of the substrate as the covering means. It is possible to simplify the connection to the substrate of the alarm device and improve the productivity of the alarm device.
According to the alarm device described in appendix 30, since the substrate is provided with the substrate hole through which the angle determining device can be inserted, the attachment angle of the light emitting means can be adjusted by an extremely easy method of inserting the angle determining device and holding down the light emitting means. It can be determined easily, and the productivity of the alarm device can be improved.
According to the alarm device described in appendix 31, since the accommodating means is provided with the closing means for closing the board hole, it is possible to prevent erroneous detection due to light from the light emitting means going around the board hole and being received by the light receiving means. It is possible to improve the detection accuracy.
According to the alarm device described in appendix 32, since the blocking means can support the detection means, when an external force is applied to the detection means for some reason, the angle of the detection means changes and the detection accuracy decreases. It is possible to prevent it from happening.
According to the alarm device described in appendix 33, since the covering means has the light emitting hole and the light receiving hole, the light emitting hole and the light receiving hole emit light while the board is covered with the covering means to prevent dust from accumulating on the board. It is possible to adopt a configuration in which the optical axes of the side detection means and the light receiving side detection means are not obstructed.
According to the alarm device described in appendix 34, since the grooves recessed toward the opposite side of the detection space are provided around the light emitting hole and the light receiving hole, the dust accumulates in the grooves, thereby preventing dust from reaching the top of the covering means. It is possible to prevent the dust accumulated around the light emitting hole or the light receiving hole in the covering means from being positioned on the light emitting axis or the light receiving axis, thereby preventing the deterioration of the detection accuracy. can.
According to the alarm device described in Supplementary Note 35, since the light shielding means is arranged so as to rise around the light emitting hole or the light receiving hole and covers the periphery of the light emitting side detecting means or the light receiving side detecting means, the light emitting side detecting means It is possible to prevent erroneous detection due to the light from the light being directly received by the light-receiving side detection means without passing through the detection space, and dust accumulated in the covering means can be transferred from the covering means through the light emitting hole and the light receiving hole. It is possible to prevent a situation in which the detection accuracy is lowered by dropping into the light emitting side detecting means or the light receiving side detecting means and accumulating on the surface of the light emitting side detecting means or the light receiving side detecting means.
According to the method of manufacturing an alarm device described in Supplementary Note 36, since the detecting means is attached to the substrate and electrically mounted, and then the covering means is installed, all the detecting means are set on the covering means before covering. It is possible to omit the operation of covering the means with a substrate and simultaneously inserting the connecting wires of the detection means into the through-holes of the substrate, simplifying the work of mounting the detection means, and covering the mechanism for mounting the detection means. It becomes possible to simplify the mechanism of the covering means and improve the productivity of the alarm device.

[Embodiment 1]
1 alarm main body 2 mounting plate 10 housing 11 front surface 12 smoke inlet 13 operation button 14 sound hole 15 mounting plate fixing portion 16 battery housing portion 17 battery 20 alarm fixing surface portion 21 upper projecting portion 22 screw hole portion 22a insertion portion 22b Sliding portion 23 Rising portion 24 Locking piece portion 30 Screw 31 Head [Embodiments 2-1 to 2-3]
201 alarm main body 210 housing 211 front surface 212 rear surface 214 operation button 215 sound hole 216 substrate 217 speaker 217c speaker main body 217d ear 217e locking recess 218 battery housing 219 battery 220 speaker fixing portion 221 rising portion 222 base portion 223 Fixed locking piece 224 Moving locking piece 225 Elastic piece 226 Penetrating part 230 Board part 231 Speaker fixing part 232 Rising part 233 Base part 234 Fixed locking piece 235 Moving locking piece 236 Elastic piece 237 Slit part 240 Board portion 241 Speaker fixing portion 242 Rising portion 243 Base surface portion 244 Fixed locking piece portion 245 Moving locking piece portion 246 Island-shaped portion 247 Bridge portion 248 Gap portion [Embodiment 3]
301 alarm body 302 mounting plate 310 housing 310a opening 310b bearing 310c lock receiving portion 310d stepped portion 311 front surface 312 smoke inlet 313 operation button 314 sound hole 320 operation portion 321 outwardly extending portion 322 rotating shaft portion 323 Elastic piece 324 Locking portion 325 Rear extending portion 326 Slit portion 328 Edge [Embodiment 4]
401 alarm main body 402 mounting plate 410 housing 411 front surface 412 smoke inlet 413 operation button 414 sound hole 416 battery compartment 417 battery 418 speaker 430 smoke detection section 431 smoke detection area 432 substrate section 433 smoke detection section cover 434 net member 435 Light-emitting portion 436 Sensor portion 436a Detection position 437 Installation base portion 440 Base portion 441 Light-shielding wall portion 441c Arc-shaped surface portion 441d Concavo-convex surface portion [Embodiment 5]
501 mounting base 502 case 503 detection unit cover 504 detection unit main body 505 circuit unit 511 mounting hook 512 main unit 512A case side facing surface 512B installation surface side facing surface 521 rear case 522 front case 523 external inflow opening 531 ceiling plate 532 labyrinth 532d labyrinth 532e Labyrinth 533 Insect screen 534 Detection space 535 Internal inflow opening 535a Internal inflow opening 535b Internal inflow opening 535c Internal inflow opening 535d Internal inflow opening 535e Internal inflow opening 541 Flange 542 Inclined portion 543 Protuberance 544 Notch 545 Speaker Storage portion 546 Element cover 547 Insertion hole 548 Battery holding spring 549 Biasing space 551 Circuit board 552 Light emitting portion 553 Light receiving portion 554 Shield 555 Switch 556 Board hole 557 Positioning hole 565 Rib 5100 Alarm device 5111 Screw hole 5121 Screw hole 5122 Engagement Part 5211 Back case side facing wall 5211a Guide recess 5211b Opposing surface 5212 Back case side outer peripheral wall 5212a Back case side end 5213a Slit 5213b Slit 5214 Engaging part 5221 Front case side exposed wall 5222 Front case side outer peripheral wall 5222a Front case side end Part 5223 Push Button 5224 Screw Boss 5225 Supporting Part 5226 Blocking Protrusion 5400a Detecting Part Main Body Side End 5411 Positioning Recess 5431 Arrangement Recess 5432 Light Emitting Recess 5433 Light Receiving Recess 5434 Groove 5435 Outer Edge Wall 5436 Light Emitting Hole 5437 Light Receiving Hole 5438 Light Shielding Frame 5561 Component case 55612 Component case 55613 Component case 55613a Fixing screw 55613b Insertion hole 55614 Component case 55614a Fixing screw 55614b Insertion hole 55615 Component case 55616 Component case 55616a Outer housing wall 65616b Inner housing wall 51 Notch 5617 Component case Stopper portion 55621 Short fin 55622 Short fin 55623 Short fin 55631 Long fin 55632 Long fin 55641 Prevention piece 55642 Prevention piece 55651 Rib 55652 Rib 55653 Rib 55654 Rib 55655 Rib 55656 Rib 55657 Rib 55658 Rib 55659 Rib 5700 Mounting jig 5701 Optical axis adjustment pin 5710 Base 5711 Light-emitting pocket 5712 Light-receiving pocket 5713 Slide member 5714 Spring 5715 Exposure lid 72 Upper hole 5716 Biasing Hole 5900 Installation surface Ar1 area Ar2 area Ar3 area CN1 power supply connector F1 arrow F2 arrow F3 arrow F4 arrow F5 arrow F21 arrow F22 arrow P1 external stagnation point P2 internal stagnation point

Claims (4)

An alarm device attached to an installation surface of an installation object, the alarm device having a mounting surface facing the installation surface,
detection means for detecting smoke contained in the gas;
housing means for housing the detection means;
a circuit board for electrical operation of at least the detection means;
The accommodation means has a first inflow opening for allowing the gas to flow into the interior of the accommodation means along the direction of the mounting surface,
The detection means has a detection space defined by a second inflow opening on the outside, which is the side of the first inflow opening, and is configured to detect the smoke contained in the gas that has flowed into the detection space. the dimension of the first inflow opening in a direction substantially orthogonal to the mounting surface is smaller than the dimension of the second inflow opening in a direction substantially orthogonal to the mounting surface,
An internal space having a cross section sandwiched between the mounting surface side and the opposite side of the mounting surface in a direction substantially orthogonal to the mounting surface is formed inside the accommodating means, and the internal space is used as a flow path for the first flow path. guide means for causing the gas from the outside to flow into the detection space substantially along the direction of the mounting surface through the first inflow opening and the second inflow opening in sequence;
The circuit board is accommodated inside the accommodation means and on the opposite side of the installation surface than the flow path,
alarm device. An alarm device attached to an installation surface of an installation object, the alarm device having a mounting surface facing the installation surface,
detection means for detecting smoke contained in the gas;
housing means for housing the detection means;
a circuit board for electrical operation of at least the detection means;
The accommodation means has a first inflow opening for allowing the gas to flow into the interior of the accommodation means along the direction of the mounting surface,
The detection means has a detection space defined by a second inflow opening on the outside, which is the side of the first inflow opening, and is configured to detect the smoke contained in the gas that has flowed into the detection space. has been
An internal space having a cross section sandwiched between the mounting surface side and the opposite side of the mounting surface in a direction substantially orthogonal to the mounting surface is formed inside the accommodating means, and the internal space is used as a flow path for the first flow path. guide means for causing the gas from the outside to flow into the detection space substantially along the direction of the mounting surface through the first inflow opening and the second inflow opening in sequence;
The circuit board is housed inside the housing means and on the opposite side of the installation surface than the flow path,
The internal space is provided with a portion on the first inflow opening side in which a cross section in a direction substantially perpendicular to the mounting surface is larger than the second inflow opening side,
alarm device. An alarm device attached to an installation surface of an installation object, the alarm device having a mounting surface facing the installation surface,
detection means for detecting smoke contained in the gas;
housing means for housing the detection means;
a circuit board for electrical operation of at least the detection means;
The accommodation means has a first inflow opening for allowing the gas to flow into the interior of the accommodation means along the direction of the mounting surface,
The detection means has a detection space defined by a second inflow opening on the outside, which is the side of the first inflow opening, and is configured to detect the smoke contained in the gas that has flowed into the detection space. has been
An internal space having a cross section sandwiched between the mounting surface side and the opposite side of the mounting surface in a direction substantially orthogonal to the mounting surface is formed inside the accommodating means, and the internal space is used as a flow path for the first flow path. guide means for causing the gas from the outside to flow into the detection space substantially along the direction of the mounting surface through the first inflow opening and the second inflow opening in sequence;
The circuit board is housed inside the housing means and on the opposite side of the installation surface than the flow path,
The internal space is provided with a portion in which a cross section in a direction substantially perpendicular to the mounting surface gradually decreases from the first inflow opening toward the second inflow opening,
alarm device. An alarm device attached to an installation surface of an installation object, the alarm device having a mounting surface facing the installation surface,
detection means for detecting smoke contained in the gas;
housing means for housing the detection means;
a circuit board for electrical operation of at least the detection means;
The accommodation means has a first inflow opening for allowing the gas to flow into the interior of the accommodation means along the direction of the mounting surface,
The detection means has a detection space defined by a second inflow opening on the outside, which is the side of the first inflow opening, and is configured to detect the smoke contained in the gas that has flowed into the detection space. has been
An internal space having a cross section sandwiched between the mounting surface side and the opposite side of the mounting surface in a direction substantially orthogonal to the mounting surface is formed inside the accommodating means, and the internal space is used as a flow path for the first flow path. guide means for causing the gas from the outside to flow into the detection space substantially along the direction of the mounting surface through the first inflow opening and the second inflow opening in sequence;
The circuit board is housed inside the housing means and on the opposite side of the installation surface than the flow path,
The detection space is positioned closer to the mounting surface than the first inflow opening in a direction substantially orthogonal to the mounting surface.
alarm device.

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