JP2854606B2 - Thermal switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal switch attached to a ceiling or a wall and detecting infrared radiation radiated from a heat source such as a human body by a pyroelectric infrared sensor.

[Related Art] In general, a thermal switch of this type includes a sensor unit radiated from a human body and a control unit that controls a load on / off when a human body is detected by the sensor unit, which are housed in the same housing. I have.

[Problem to be Solved by the Invention] In a conventional thermal switch, a sensor unit and a control unit in a housing are integrally formed, and, for example, when the range of a detection area is changed, only the sensor unit is separately replaced. However, there is a problem that the entire unit including the control unit must be replaced.

The present invention has been provided in view of the above points,
At least the main part including the sensor unit is unitized,
It is an object of the present invention to provide a thermal switch capable of promptly responding to a purpose such as a change in specifications.

[Means for Solving the Problems] The present invention relates to a sensor unit including a heat ray sensor for detecting a heat ray radiated from a human body and a lens for condensing a heat ray in a predetermined detection area onto the heat ray sensor; And a control unit for controlling the load to be turned on / off in response to the above signal, and at least the sensor unit is detachably attached to the thermal switch body.

Further, the sensor section can be freely connected to the control section via a connector.

Further, the sensor unit can be freely connected to the control unit by a plug-in system.

[Operation] According to the above configuration, the sensor unit including the heat ray sensor and the lens is detachably attached to the thermal switch main body, so that the sensor unit can be replaced according to the purpose of use of the thermal switch. ing.

In addition, the sensor unit can be freely connected to the control unit as a connector type or a plug-in type.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the thermal switch A, and FIG. 2 is an exploded perspective view of the sensor section B. As shown in FIG. 2, the sensor section B includes a substantially cylindrical rotating frame 1, a lens 2 composed of 12 divided spherical Fresnel lenses, and a dome-shaped rotating frame 3. An opening 4 for projecting the lens 2 is opened on the lower surface of the rotating frame 1, and four projections 5 are provided on the upper peripheral end surface. Opposing projections 6 and 7 are provided on the inner peripheral surface, and one projection 6 has a groove 6.
a is recessed in the vertical direction. Opposing projections 8 and 9 are integrally provided on the upper peripheral end surface of the lens 2, and one projection 8 has a rib 8 a formed on an outer surface. A concave portion 10 is formed in the lower peripheral end surface of the rotating frame 3 in which a printed circuit board on which a pyroelectric element and the like are mounted is disposed.

Here, the rib 6a of the lens 2 is inserted into the groove 6a of the projection 6 of the rotating frame 1.
After inserting the rotation frame 1 with the lens 2 along
The assembly is completed by press-fitting the projections 5 of the rotating frame 1 into the concave portions 10 of FIG. At this time, the outer surface of the projection 9 of the lens 2 comes into contact with the inner surface of the projection 7 of the rotating frame 1. Then, the projections 8 and 9 of the lens 2 are pressed against the lower peripheral end surface of the rotating frame 3 so that the projections 8 and 9 of the lens 2 do not protrude from the upper surfaces of the projections 6 and 7 of the rotating frame 1.

As shown in FIG. 1, a pyroelectric element 11
Printed circuit board 12 on which boss 14 is mounted
Fixed at 13. Sensor part B is the opening of body 15
The body of the control unit C is
15 is fixed to the body with tapping screw 17.
The sensor portion B is urged by the holding metal fitting 18 fixed to 15 and arranged. In other words, the sensor portion B is positioned on the body 15 by the holding member 18, and is rotatably mounted. A printed circuit board 19 for power control is fixed to the body 15 with a tapping screw 20, and a window hole of the rotating frame 3 of the sensor unit B is provided.
3a (FIG. 2) and a lead wire 21a from the printed circuit board 12 and a printed circuit board 19 on which a power control circuit is mounted.
Can be freely connected to the lead wire 21b by connectors 41a and 41b. That is, the sensor section B and the control section C are freely connectable via the connectors 41a and 41b, and the sensor section B having the changed lens characteristics with respect to the control section C is easily used when the range of the detection area or the like is changed. It can be changed according to the purpose.

Further, a lead wire 22 from the printed circuit board 19 is connected to a terminal portion 24 provided on the cover 23. The cover 23 is fixed to the body 15 by assembly screws 25. Terminal part 24 is a terminal screw
24a and a terminal board 24b. An insulating wall 26 is integrally formed between and on both sides of the terminal screw 24a, and the insulating wall 26 is insulated by a pressing plate 27 thereon. Further, a decorative plate 28 is mounted on the lower surface of the body 15.

That is, as shown in FIG. 7, a lead wire 21b with a connector 41b is put out from the printed circuit board 19 fixed to the body 15, and the sensor section B is mounted in this state. The electrical connection is completed by taking out the lead wire 21a having the connector 41a from the window hole 3a and connecting the connectors 41a and 41b. Finally, the decorative plate 28 is attached and the process is completed.

When a heat ray is incident on the pyroelectric element 11 through the lens 2 protruding from the rotating frame 1 of the sensor section B, a detection output is obtained only when the heat dose changes, and the lens 2 is moved by 15 ° in all directions as described later. The detection range can be adjusted step by step. The detection output obtained when a heat ray is received is taken out from the terminal section 24 to the outside.

As shown in FIG. 5, a mounting bracket 29 is provided on the upper surface of the cover 23.
Are mounted rotatably, one end of a return spring 30 is engaged with the upper part of the mounting bracket 29, and the other end of the return spring 30 is a cover.
It is locked on the upper surface of 23 and urges in the direction in which the mounting bracket 29 stands. A long hole (not shown) through which the bolt 31 is inserted is formed in the mounting bracket 29. As shown in FIG. 1, the body 15 has an insertion hole through which the bolt 31 is inserted.
32, a bolt 31 is inserted through the insertion hole 32 and the long hole of the mounting bracket 29, and a nut 33 is screwed to the tip of the bolt 31 as shown in FIG. The nut 33 has a rectangular shape, and its peripheral edge is brought into contact with the mounting bracket 29 so as to be prevented from rotating.

As shown in FIG. 5, a mounting hole 35 is formed in the ceiling material 34, and the upper part of the thermal switch A is mounted in a state where the bolt 31 is loosened.
After being inserted into 35, the bolt 31 is tightened, the mounting bracket 29 is lowered onto the upper surface of the ceiling material 34, and the flange 15a of the body 15 is
To the lower surface of the ceiling material 34, and the mounting bracket 29 and the flange 15a
The thermal switch A is attached with the ceiling material 34 held therebetween.

Next, a rotation mechanism of the sensor unit B will be described. As shown in FIG. 1 and FIG.
A protrusion 36 is provided at the center of the upper part of the holding member 18, and the protrusion 36 is located in a hole 37 formed in the center piece 18 a of the holding member 18. In other words, the rotation range (angle) of the sensor unit B is limited by the fact that the projection 36 is located in the hole 37. In addition, holes 18b through which tapping screws 17 are inserted are formed on both sides of the holding member 18. A projection 38 formed on the side of the rotating frame 3 is a guide groove formed on the body 15.
When the sensor part B is arranged on the body 15, the protrusion 38 is inserted into the guide groove.
The positioning is performed by inserting along 39. Furthermore,
A plurality of ring-shaped ribs 40 are provided around the projection 36 of the rotating frame 3 in a radial direction. The rib 40 performs a click action when rotating the sensor portion B with respect to the body 15 along a vertical surface. Therefore, when the necessary area is set after the heat-sensitive switch A is set, a click action function can be provided by operating the rotary frame 3, and the diameter of the hole 37 of the presser fitting 18 is adjusted by the rib 40 of the rotary frame 3. Centering (middle) can be performed by making the diameter equal to the diameter at one point. In addition, the sensor unit is mainly designed for ceiling mounting, so it can provide a compact and clean design, and the sensor unit B can be rotated 15 degrees in all directions. The restriction is reduced.

Next, the structures of the lens 2 and the pyroelectric element 11 of the sensor section B will be described. In this embodiment, basically, four pyroelectric elements 11 are used, and a dome-shaped Fresnel lens having a small aberration is used as the lens 2 for focusing infrared rays. The lens 2 is made of, for example, a synthetic resin (for example, high-density polyethylene) through which heat rays can easily pass, and the pyroelectric element 11 as an infrared sensor is arranged near the center of the lens 2 as a spherical body. . Therefore, since the pyroelectric element 11 does not come into contact with the external airflow, the pyroelectric element 11 can be detected without error even if a difference occurs in the temperature distribution due to the disturbance of the external airflow.

As shown in FIG. 2, the lens 2 has 12 lens portions 2a, 2
b, and the optical axis of each of the lens sections 2a and 2b is set radially with the pyroelectric element 11 as the center. Here, the concave and convex surface of the lens 2 is formed on the inner peripheral surface side, so that reflection on the outer peripheral surface is reduced to prevent a decrease in transmission efficiency. The center of the lens 2 is the intersection of the lens 2 with a normal line set at the center of the light receiving surface of the pyroelectric element 11, and the lens portions 2a and 2b are formed around this center. That is,
The lens portions 2a and 2b are composed of four lens portions 2a each having the vicinity of the center divided at 90 ° intervals in the circumferential direction and eight lens portions 2b divided at 45 ° intervals around the outer periphery of the lens portion 2a. ing.

8 and 9 show another embodiment, in which a sensor portion B is shown.
And the control unit C are connected in a plug-in manner. A socket 42 is provided on the printed circuit board 19 of the control section C, and a lead section 43 is protruded from the back of the sensor section B. When the sensor section B is mounted on the control section C, the lead section 43 is connected to the socket 42. To obtain an electrical connection.

FIG. 10 shows the unit body 44 formed by integrating the sensor unit B and the control unit C. In this case, the unit body is attached to the base 45 attached to the ceiling surface, etc.
44 is attached, and then covered with a cover 46. In this case, the unit main body 44 including the sensor section B and the control section C can be retrofitted. When a large number of the thermal switches are mounted, a wide area can be automatically detected, for example, lighting equipment can be turned on and off, and the system can be expanded.

FIG. 11 shows a circuit of the control section C. Terminals T ₁ and T ₂ are connected to external lines, and terminals T _{3 to} T ₅ are connected to the sensor section B. Normally diode bridge DB ₁ , transistor Tr ₁
The power is supplied to the sensor unit B via. When the sensor unit B detects the human body, the terminal T ₄ becomes L level, and turned on the Zener diode ZD _1, the voltage determined by the zener voltage is output between terminals T _1, T _2, in later-described controller 52 side Received.

When the above-described heat-sensitive switch A is used for blinking control of the lighting apparatus 50, for example, as shown in FIG. It is connected to a controller 52 installed on a wall or the like via a signal line 51. The controller 52 has a control line 53
And a lighting device 50 via a power supply line 54. That is, in the present embodiment, the controller 52 which is a control unit for directly controlling the lighting equipment as a load is configured separately from the thermal switch A, and the thermal switch A simply outputs a human detection signal. The signal is sent to the controller 52, and the controller 52 receives the signal from the thermal switch A and controls the lighting device 50 to blink. FIG. 13 shows a case where the thermal switch A is installed in each room.

By the way, if the load is a lighting fixture, it may be desirable to turn on or turn off the lights continuously regardless of whether a person enters or exits the detection area. The controller 52 is provided with a function capable of setting a mode such as continuous light-off.

[Effects of the Invention] As described above, the present invention provides a heat ray sensor for detecting a heat ray radiated from a human body, and a sensor unit including a lens for condensing the heat ray in a predetermined detection area on the heat ray sensor,
And a control unit that controls the load on and off in response to a signal from the sensor unit, and at least the sensor unit is detachably attached to the thermal switch body. By changing the detection range, it is possible to easily change the detection range according to the purpose by changing the detection range.

In addition, the sensor section can be freely connected to the control section as a connector type or plug-in type, so the sensor section can be changed as necessary, so that the detection range can be changed easily according to the purpose It has the effect that can be done.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of a sensor unit of the above, FIG.
4 (a) and 4 (b) are a broken down view and a plan view of the same.
FIG. 5 is a sectional view showing the same mounting state, FIG. 6 is a bottom view showing the same, FIG. 7 is a drawing showing the same mounting state, FIG. FIGS. 10 (a) and 10 (b) are sectional views and bottom views of still another embodiment, FIG. 11 is a circuit diagram of a control unit of the above embodiment, and FIG. FIG. 13 is a system configuration diagram, and FIG. A is a thermal switch, B is a sensor unit, C is a control unit, 41a,
41b is a connector.

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G01V 9/04 G01J 1/02 G08B 13/00 H01H 37/00 H02J 13/00 H03K 17/78

Claims (3)

(57) [Claims] 1. A sensor unit comprising a heat ray sensor for detecting a heat ray radiated from a human body, a lens for condensing a heat ray in a predetermined detection area on the heat ray sensor, and a load on / off in response to a signal from the sensor section. And a control unit for controlling the thermal switch, wherein at least a sensor unit is detachably attached to the thermal switch body. 2. The thermal switch according to claim 1, wherein the sensor section is freely connectable to the control section via a connector. 3. The thermal switch according to claim 1, wherein the sensor unit is freely connectable to the control unit by a plug-in system.