JP2001188275A - Stop device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop device for a camera which is advantageous in cost and space by making a stop member, having one surface fitted with a filter plate so that a circular opening part is covered, suitably operate in a stop chamber. SOLUTION: The stop chamber which stores stop members 4 and 5 is formed between a 1st stop base plate 1 and a 2nd stop base plate 2 and a shutter chamber which stores shutter blades 7 and 8 is formed between the 2nd stop base plate and a shutter base plate 3. The 1st stop base plate 1 and shutter base plate 3 have circular opening parts 1a and 3a restricting an optical path of photography with a maximum diameter. The 2nd stop base plate 2 has an arcuate cut part 2a formed and part of it faces the opening parts 1a and 3a. The filter plate 6 is fitted to the circular opening part 5a of the stop member 5 and operates always in the state of facing the cut part 2a or in the cut part 2a, so its surface is never scratched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm apparatus for a camera in which an aperture having a smaller diameter than an exposure aperture for regulating the maximum aperture is selectively made to enter a photographic optical path by a diaphragm member. About.

[0002]

2. Description of the Related Art As is well known, camera diaphragm devices include:
There are two main types. One is to change the size of the aperture opening by a plurality of blades, the other is to one or more aperture members,
Each of the openings has a smaller diameter than the opening for exposure, and the opening having a smaller diameter is selectively made to face the opening for exposure. Although the former diaphragm device has an advantage that the diaphragm aperture can be continuously changed, it is difficult to obtain an aperture hole having a good roundness evenly, and particularly, an aperture having a small diameter is obtained. There is a drawback in that it is very difficult to manufacture. In addition, the latter diaphragm device has an advantage that a very good circular aperture can be obtained, but has a drawback that it is substantially impossible to obtain a large number of diaphragm apertures.

Meanwhile, with the miniaturization and cost reduction of cameras, recently, a lens having a small aperture and a large brightness has been adopted, and a lens having a diameter of 10 mm or less has not become uncommon. Therefore, in such cameras, the former type of diaphragm device has been avoided, and the latter type of diaphragm type, which can easily obtain a small and highly circular aperture stop, has come to be used frequently. However, as described above, the latter type of aperture device has a disadvantageous configuration for obtaining aperture apertures in multiple stages. Therefore, a configuration example in which a filter (ND filter) is used in addition to the above-described aperture member to make up for this point is disclosed in JP-A-11-109440.
No., published in Japanese Unexamined Patent Publication No. On the other hand, the diameter of the opening cannot be reduced without limit because diffraction occurs.
For this reason, it is known that, from a stop aperture having a certain diameter, the aperture is covered with a filter instead of reducing the diameter of the aperture.

[0004]

SUMMARY OF THE INVENTION The present invention belongs to the latter type, and relates to a diaphragm device for a camera provided with a diaphragm member having a filter plate attached to an opening. By the way, since recent filters are made of synthetic resin, the surface is very easily damaged. Therefore, it is required to prevent the surface of the filter plate from contacting other members during the operation of the throttle member. Therefore, an example of the configuration of the throttle member that can meet such a demand is shown as a filter member 35 in FIG. 19 of the above-mentioned publication.

However, as described above, since the lens has become smaller in diameter, it is necessary to make the aperture member itself smaller. Therefore, it is preferable that the aperture member for attaching the filter plate has a simple shape that is easy to manufacture as much as possible, and it is preferable that the operation when attaching the filter plate with an adhesive can be easily performed. like this,
From the viewpoint, the filter member 35 in the above publication is
Is excellent as a structure that does not damage the filter plate 35B, but has room for improvement in cost. Also, the aperture chamber for accommodating the aperture member is required to make the dimension in the optical axis direction as small as possible, especially when the aperture chamber is arranged adjacent to the shutter. Therefore, there is a problem in that the above dimensions must be increased. This problem cannot be ignored especially when a plurality of aperture members to which the filter plate is attached are provided.

The present invention has been made in order to solve such a problem, and an object of the present invention is that even if a filter plate is attached to an opening of a diaphragm member, the filter plate may be damaged. An object of the present invention is to provide an aperture device for a camera which is advantageous in terms of cost and space in that the size of the aperture chamber in the optical axis direction does not need to be increased.

[0007]

In order to achieve the above-mentioned object, an aperture device for a camera according to the present invention includes at least one aperture member in an aperture chamber formed between a first ground plate and a second ground plate. Are mounted so as to be capable of reciprocating operation. An exposure opening for restricting a photographing optical path having a maximum diameter is formed in the first base plate, and a cutout portion of an opening larger than the exposure opening is formed in the second base plate. Part and the exposure opening are formed so as to face each other, and the aperture member has an opening in the exposure opening that can be exposed to the imaging optical path, and at least one aperture The member has an optical filter plate attached to the surface on the side of the notch so as to close the opening, and the optical filter plate is always opposed to the opening of the notch, and can be operated even in the notch. To

In the camera diaphragm apparatus of the present invention, at least one diaphragm member is provided in a second diaphragm chamber formed by attaching a third ground plate to the first ground plate on a side opposite to the second ground plate. A reciprocating operation is provided, and a notch portion of an opening larger than the opening for exposure is formed on the third base plate such that a part of the opening is opposed to the opening for exposure, and a second diaphragm chamber is provided. An aperture is formed in the aperture member disposed in the imaging optical path, and at least one aperture member has a surface on the notch side of the third base plate so as to close the aperture. The optical filter plate may be attached to the optical filter, and the optical filter plate may always face the opening of the cutout, and may be operated in the cutout.

In the camera diaphragm device of the present invention, at least one diaphragm member is provided in a second diaphragm chamber formed by attaching a third ground plate to the second ground plate on a side opposite to the first ground plate. It is attached so as to be able to reciprocate, the third base plate is formed with an opening equal to or larger than the opening for exposure at a position facing the opening for exposure,
The aperture member disposed in the second aperture chamber is formed with an opening that can face the photographing optical path, and at least one aperture member covers the second aperture so as to close the opening.
An optical filter plate may be attached to the surface of the base plate on the side of the notch, and the optical filter plate may always face the opening of the notch, and may be operated in the notch.

In the camera diaphragm device of the present invention, at least one diaphragm member is provided in a second diaphragm chamber formed by attaching a third ground plate to the second ground plate on a side opposite to the first ground plate. A reciprocating operation is provided, and a notch portion of an opening larger than the opening for exposure is formed on the third base plate such that a part of the opening is opposed to the opening for exposure, and a second diaphragm chamber is provided. An aperture is formed in the aperture member disposed in the imaging optical path, and at least one aperture member has a surface on the notch side of the third base plate so as to close the aperture. The optical filter plate may be attached to the optical filter, and the optical filter plate may always face the opening of the cutout, and may be operated in the cutout.

Further, in the aperture device for a camera according to the present invention, at least one shutter blade can reciprocate in a shutter chamber formed between one of the base plates and the shutter base plate outside the stop chamber. The exposure opening is formed in one of the first base plate and the shutter base plate, and the other is the same as the exposure opening at a position facing the exposure opening. An opening larger than that may be formed, and the unit may be formed together with the shutter.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to two examples. 1 to 4 are used for explaining the first embodiment, and FIGS. 5 to 7 are used for explaining the second embodiment. The cross-sectional views of FIGS. 2, 6, and 7 are shown for easy understanding of the overlapping relationship of the constituent members, and are not cross-sectional views of predetermined portions of the plan views of the respective embodiments. The overlap interval between members is
In order to make the drawing easier to see, it is shown larger than it actually is.

[First Embodiment] In this embodiment, a diaphragm device is unitized together with a shutter, and is configured for a digital camera. The plan views of FIGS. 1, 3, and 4 are views in which the subject side is viewed from the side of the imaging device such as a CCD. In the following, the imaging device side is referred to as the front side, and the subject side is the back side. And will be described. Therefore, first, the configuration of the present embodiment will be described. In the present embodiment, a first diaphragm base plate 1, a second diaphragm ground plate 2, and a shutter ground plate 3 having the same outer shape are arranged in order from the subject side, and a space between the first diaphragm ground plate 1 and the second diaphragm ground plate 2 is provided. An aperture chamber is provided, and the space between the second aperture base plate 2 and the shutter base plate 3 is provided as a shutter chamber, and they are attached to each other by appropriate means (not shown).

Openings 1a and 3a having the same diameter are formed at the center of the first diaphragm base plate 1 and the shutter base plate 3 so as to regulate the maximum aperture of the diaphragm opening. However, it is extremely difficult to machine the openings 1a and 3a to have exactly the same diameter, or to assemble them so that they are correctly and concentrically arranged. In this case, one of the openings is made larger. It may be manufactured and the other opening may be used as an exposure opening. An arc-shaped notch 2 a is formed in the second drawn ground plate 2. Then, as shown in the plan view of FIG. 1, a part of the notch 2 a
The openings 1a and 3a are arranged so as to overlap with each other.

In the diaphragm chamber, diaphragm members 4 and 5 are rotatably mounted on shafts 1b and 1c provided on the first diaphragm base plate 1. The aperture members 4 and 5 are formed with apertures 4a and 5a smaller than the apertures 1a and 3a and having the same diameter and elongated holes 4b and 5b. On the surface on the second diaphragm base plate 2 side, a filter plate 6 for dimming is attached with an adhesive so as to cover the opening 5a. In the shutter chamber, shutter blades 7, 3 are provided on shafts 3b, 3c provided on the shutter base plate 3.
8 is rotatably mounted. The shutter blades 7 and 8 are formed with long holes 7a and 8a.

On the front side of the shutter base plate 3, three motors 9, 10, 11 are mounted. These motors are described in, for example, Japanese Utility Model Publication No. 5-9709, and are motors of the current control type generally referred to as moving magnet type motors, which correspond to the direction of current supply to the stator coil. Thus, it is possible to rotate a rotor made of a permanent magnet by a predetermined angle in a predetermined direction, but since the specific configuration is too well known, the rotor is shown in the drawing. 9a, 10a, 11
a and the drive pins 9b, 10b, 1 that rotate integrally therewith
Only 1b is shown. The drive pins 9b penetrate through long holes (not shown) formed in the shutter base plate 3 and are fitted into the long holes 7a, 8a of the shutter blades 7, 8, and the drive pins 10b, 11b Shutter base plate 3 and second
The aperture members 4 and 5 are fitted into the elongated holes 4b and 5b through elongated holes (not shown) formed in the aperture base plate 2, respectively. In FIG. 1, since a part of the shutter base plate 3 is omitted, the motors 10 and 11 are indicated by dashed lines.

Next, the operation of this embodiment will be described. As described above, this embodiment is applied to a digital camera. Therefore, in the initial state before photographing shown in FIG. 1, the shutter blades 7 and 8 have the openings 1a and 3a fully opened and the power switch is closed. Has become possible. According to the present invention, in this state, when the subject brightness is high, the aperture members 4 and 5 are automatically operated to restrict the light passing through the exposure openings (openings 1a and 3a). However, this is not the case in the present embodiment.

At the time of photographing, when the release button is pressed, the photographing is performed at the maximum aperture regulated by the openings 1a and 3a, or at the opening 4a of the diaphragm member 4 in accordance with the subject luminance measured in advance. When photographing or photographing with the opening 5a of the diaphragm member 5 and the filter plate 6 is selected, and the luminance of the subject is large, when photographing with the diaphragm member 5 activated, the motor 11 is not fixed. Current is supplied to the child coil in the forward direction, and the rotor 11a is rotated clockwise. Therefore, the diaphragm member 5 is rotated in the counterclockwise direction. In the process, the diaphragm member 5 may be operated in a direction perpendicular to the operation direction, such as when the fan is opened.

However, even in such a case, in the case of the present embodiment, the filter plate 6 always has the cutout 2.
In this case, the filter plate 6 is operated in the counterclockwise direction in a state facing the filter plate 6a, and in some cases, can be operated inside the cutout portion 2a. You won't be hurt. Therefore, the diaphragm member 5 can be arranged close to the second diaphragm base plate 2, and if necessary, the filter plate 6 can always be operated in the notch 2a. Accordingly, it is possible to reduce the distance between the first drawn ground plate 1 and the second drawn ground plate 2.

In this way, the filter plate 6 whose aperture is regulated by the opening 5a is moved to the exposure opening (opening 1).
a, 3a) is the state shown in FIG. In this state, the rotation of the aperture member 5 is
It is stopped directly or indirectly by a stopper not shown. Further, although the forward energization of the stator coil of the motor 11 is not cut off, even if it is cut off, as is well known, between the rotor 11a and a plurality of ferromagnetic members (not shown). This state is maintained by the acting suction force. Then, in this state, a signal to start shooting is given from the exposure control circuit to the imaging device, and shooting is performed.

Thereafter, when a signal indicating the end of photographing is issued from the exposure control circuit, the stator coil (not shown) of the motor 9 is energized in the forward direction, and the rotor 9a is rotated clockwise. . Therefore, one shutter blade 7 is rotated in the counterclockwise direction, and the other shutter blade 8 is rotated in the clockwise direction, and is brought into the closed state shown in FIG. Then, when the storage in the storage device is completed in this closed state, the current is supplied to the stator coils of the motors 9 and 11 in the reverse direction, and the rotors 9a and 11a are both rotated counterclockwise. Therefore, the diaphragm member 5 and the shutter blades 7 and 8 return to the state shown in FIG. 1, and thereafter, a series of operations is completed by cutting off the power supply to each stator coil in the reverse direction.

Incidentally, in the case of photographing using the aperture member 4, the description will be omitted since it is performed according to the above description. Further, the present invention is not limited to providing such a diaphragm member 4.
Also, there is no limitation on the diameter of the opening 5a of the aperture member 5,
It may be the same as the opening 1a. The point is that the photographing light may be reduced in a predetermined manner depending on the relationship between the density of the ND filter used as the filter plate 6 and the aperture.

In this embodiment, only one diaphragm member having a filter plate is arranged in the diaphragm chamber. However, two diaphragm members may be arranged. That is, for example, a filter plate having a density different from that of the filter plate 6 may be attached to the aperture member 4 so as to cover the opening 4a. In that case, when the filter plate is attached to the first base plate 1 side with respect to the diaphragm member 4, the opening 1
The shape of “a” may be made the same as the shape of the notch 2 a, and similarly to the case of the aperture member 5, when attached to the second throttle base plate 2 side, the notch having the same shape as the notch 2 a
What is necessary is just to form so that a part may overlap and may be connected to the notch 2a.

In this embodiment, a shutter chamber is formed between the second diaphragm base plate 2 and the shutter base plate 3, but the shutter base plate 3 is arranged on the back side of the first diaphragm base plate 1, A shutter chamber may be formed between the first aperture base plate 1 and the shutter base plate 3. Further, in this embodiment, the aperture device is unitized together with the shutter, but it goes without saying that a configuration using only the aperture device is also an aspect of the present invention. Further, the present embodiment has been described for the case where the present invention is applied to a digital camera. However, if the operation method of the shutter blades 7 and 8 is changed, the present embodiment can be applied to a camera using a film. In this case, the present invention can be applied to a single-lens reflex camera.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. 5 and 6. In this embodiment, only the diaphragm device is used. However, only one squeezing chamber is provided, whereas two squeezing chambers are provided. The reason for providing two throttle chambers in this way is mainly when it is desired to provide a large number of throttle members, but even in such a case, if the distance between the base plates forming each throttle chamber can be reduced, It will be very convenient. However, if a large number of aperture members are shown, the drawing becomes complicated. Therefore, in the case of this embodiment, only one aperture member is disposed in the first aperture chamber and two aperture members are disposed in the second aperture chamber. I will explain in the case that it is.

Therefore, the configuration of the present embodiment will be described, but portions which need not be described in detail from the description of the first embodiment will be briefly described. In this embodiment, the first diaphragm base plate 2 having the same outer shape is sequentially arranged from the subject side.
A first throttle base plate 22 and a third throttle base plate 23 are arranged, a space between the first throttle base plate 21 and the second throttle base plate 22 is defined as a first throttle chamber, and a second throttle base plate 22 and a third throttle base plate are arranged. 23 is a second throttle chamber, which is attached to each other by appropriate means (not shown). An opening 22a is formed in the center of the second diaphragm base plate 22 to regulate the maximum diameter of the diaphragm opening.
The first drawn ground plate 21 and the third drawn ground plate 23 are formed with arc-shaped notches 21a and 23a, respectively. The cutouts 21a and 23a are partially arranged so as to overlap the opening 22a.

In the first throttle chamber, the first throttle base plate 21
An aperture member 24 is rotatably attached to a shaft 21b provided in the aperture member 24. The aperture member 24 has an opening 24a smaller than the opening 22a and an elongated hole 24b. Then, on the surface on the first drawing ground plate 21 side,
A light-reducing filter plate 25 having a low density is attached so as to cover the opening 24a. Further, in the second throttle chamber, a shaft 23b provided on the third throttle base plate 23,
Aperture members 26 and 27 are rotatably attached to 23c. And, those diaphragm members 26 and 27 include:
Openings 26a, 27a having the same diameter as the above-mentioned opening 24a
And apertures 26b and 27b are formed in the aperture member 27. On the surface of the aperture member 27 on the side of the third aperture base plate 23, a dark filter plate 28 for darkening is provided so as to cover the opening 27a. Affixed.

Further, three moving magnet type motors 29, 30 and 31 are mounted on the front side of the third throttle base plate 23, and the rotors 29a and 30 are shown in FIG.
a, 31a and only the drive pins 29b, 30b, 31b. The drive pins 30b and 31b are connected to the third
The aperture members 26 and 27 are fitted into the elongated holes 26b and 27b of the aperture members 26 and 27 through the elongated holes (not shown) formed in the aperture ground plate 23, and the drive pin 29b is connected to the second aperture ground plate 22 and the third aperture plate.
The aperture member 24 penetrates an elongated hole (not shown) formed in the aperture base plate 23 and is fitted into the elongated hole 24 b of the aperture member 24.

Next, the operation of this embodiment will be described. When the aperture 22a having the maximum aperture is selected at the time of photographing, photographing is performed with the aperture members 24, 26, and 27 kept in the state shown in FIG. Also, the opening 26 of the diaphragm member 26
When a is selected, the stator coil of the motor 30 is energized in the forward direction, and the rotator 30a is rotated clockwise to rotate the aperture member 26 counterclockwise. Is photographed in a state where the image is exposed to the photographing optical path. After that, when the photographing is completed, the motor 3
5 is conducted in the opposite direction to the stator coil of FIG.
Return to the state shown in. In this case, since the filter plate is not attached to the diaphragm member 26,
Even if the throttle member 27 or the second throttle base plate 22 comes into sliding contact during the operation, no problem occurs.

When the object brightness is higher than in the above case and the aperture member 24 is selected, the stator coil of the motor 29 is energized in the forward direction, and the rotor 2
The aperture member 24 is rotated counterclockwise by rotating the shutter 9a clockwise, and the opening 24a covered with the filter 25 is exposed to the photographing optical path. Thereafter, when the photographing is completed, the stator coil of the motor 29 is energized in the reverse direction to return to the state shown in FIG. 5, but during those operations, the filter plate 25 is always in the notch 21a. And, in some cases, can be operated in the notch 21a, so that the filter plate 25 is never damaged.

Further, when the throttle member 27 is selected, the stator coil of the motor 31 is energized in the forward direction, and the rotor 31a is rotated clockwise to move the throttle member 27 counterclockwise. By rotating the opening, the opening 27a covered with the filter 28 is exposed to the photographing optical path. Thereafter, when the photographing is completed, the stator coil of the motor 31 is energized in the reverse direction to return to the state shown in FIG. 5, but during the operation thereof, the filter plate 28 is always in the notch 23a. , And can be operated in the notch 23a in some cases.
There is absolutely no scratching on it.

In this embodiment, the diaphragm members each having a filter plate attached thereto are arranged one by one in each of the two diaphragm chambers. However, diaphragm members having different combinations of filter density and aperture diameter are used. It does not prevent the arrangement of two or more in each throttle chamber. Further, in the present embodiment, the second throttle chamber is formed between the second base plate 22 and the third base plate 23. However, the third throttle base plate 23 is disposed on the back side of the first throttle base plate 21, A second throttle chamber may be formed between the first throttle base plate 21 and the third throttle base plate 23, and the throttle members 26 and 27 may be disposed therein.

In this case, the filter plate 28 is mounted so as to face the notch portion 23a of the third throttle base plate 23, but it is also possible to mount the filter plate 28 so as to face the notch portion 21a of the first throttle base plate 21. It is. However, in such a case, the cutout portion 21a and the cutout portion 23a in this embodiment are partially overlapped and combined (in the plan view of FIG. 5, the cutout portion 21a and the cutout portion 23a are continuous). Is required to be the notch of the first drawn ground plate 21. Accordingly, the third base plate 23 has an arc-shaped notch 23a.
It is no longer necessary to form the opening 22 of the second drawing ground plate.
The opening may be the same as or larger than a.

Further, in the present embodiment, the stop device is described as a unit, but it is also possible to form a unit together with the shutter as in the first embodiment. Therefore, in FIG. 7, the shutter base plate 3 and the third diaphragm base plate 23 are used.
(The same reference numerals are used for the shutter base plate and the shutter blades as in the first embodiment), but the shutter room is formed between the first diaphragm base plate 21 and the shutter diaphragm. The shutter chamber can be formed on the front side or the back side in the same manner in each of the above-described modifications of the present embodiment. In such a case, the diameter of the opening 3a formed in the shutter base plate 3 may be larger than the diameter of the opening 22a formed in the second diaphragm base plate 22, and conversely,
Only the opening 3a may be used as the exposure opening, and the diameter of the opening 22a may be larger than that.

In each of the above embodiments, all the notches are formed in an arc shape. However, the present invention is not limited to such a shape. Is not limited to a circle. Each filter plate may have an external shape that is easy to attach to the surface of each throttle member in production, and each notch may have a shape that does not hinder the operation of the filter plate. Will be. Further, in each of the above embodiments, the plurality of motors are mounted on the same base plate, but this does not prevent the motors from being separately mounted on the base plates on both sides. In addition, the present invention is not limited to a motor using a drive source, and may be manually operated using a cam ring or the like.When a motor is used, in addition to a moving magnet type motor, It is also possible to use a stepping motor. Further, it is also possible to selectively operate two throttle members by one motor.

[0036]

As described above, according to the present invention, a diaphragm member having a circular opening and having a filter plate attached to one surface so as to cover the opening is operated in the diaphragm chamber. However, there is no risk of damaging the filter plate, and the size of the aperture chamber in the optical axis direction does not need to be increased, which is extremely advantageous in terms of cost and space.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment showing an initial state before photographing.

FIG. 2 is a sectional view showing an overlapping relationship of members constituting the first embodiment.

FIG. 3 is a plan view of the first embodiment showing a state where an aperture is set prior to photographing.

FIG. 4 is a plan view showing a state immediately after the end of photographing in the first embodiment.

FIG. 5 is a plan view of the second embodiment showing an initial state before photographing.

FIG. 6 is a sectional view showing an overlapping relationship of members constituting a second embodiment.

FIG. 7 is a cross-sectional view showing an overlapping relationship of constituent members when a second embodiment and a shutter are unitized.

[Explanation of symbols]

1,21 1st drawing ground plate 1a, 3a, 4a, 5a, 22a, 24a, 26a, 2
7a Openings 1b, 1c, 3b, 3c, 21b, 23b, 23c Axis 2, 22 Second diaphragm base plate 2a, 21a, 23a Notch portion 3 Shutter base plate 4, 5, 24, 26, 27 diaphragm member 4b, 5b, 7a , 8a, 24b, 26b, 27b Slot 6, 25, 28 Filter plate 7, 8 Shutter blade 9, 10, 11, 29, 30, 31 Motor 9a, 10a, 11a, 29a, 30a, 31a Rotor 9b, 10b , 11b, 29b, 30b, 31b Drive pin 23 Third throttle base plate

Claims (5)

[Claims] At least one aperture member is reciprocally mounted in an aperture chamber formed between a first ground plane and a second ground plane, and the first ground plane regulates an imaging optical path having a maximum aperture. An exposure opening to be formed is formed, and a cutout portion of an opening larger than the exposure opening is formed on the second base plate such that a part thereof faces the exposure opening, and the aperture member has An opening capable of facing the imaging optical path in the exposure opening is formed, and at least one aperture member has an optical filter plate on a surface on the notch side so as to close the opening. A diaphragm device for a camera, wherein the optical filter plate is mounted so that the optical filter plate always faces the opening of the cutout, and can be operated even in the cutout. 2. A second throttle chamber formed by attaching a third ground plate to a side opposite to the second ground plate with respect to the first ground plate, wherein at least one throttle member is mounted to be capable of reciprocating operation. The third base plate is formed with a cutout having an opening larger than the opening for exposure so that a part of the opening is opposed to the opening for exposure. An opening capable of being exposed to the optical path is formed, and at least one aperture member has an optical filter plate attached to a surface on the notch side of the third base plate so as to close the opening. 2. The diaphragm device for a camera according to claim 1, wherein an optical filter plate is always opposed to an opening of the cutout portion, and can be operated even in the cutout portion. 3. A second throttle chamber formed by attaching a third ground plate to the second ground plate on a side opposite to the first ground plate, wherein at least one throttle member is mounted to be capable of reciprocating operation. An opening equal to or larger than the exposure opening is formed in the third base plate at a position facing the exposure opening, and an aperture member disposed in the second aperture chamber faces the imaging optical path. An opening that can be formed is formed, and at least one aperture member is provided with an optical filter plate on the cutout side of the second base plate so as to close the opening. 2. The diaphragm device for a camera according to claim 1, wherein the aperture is always opposed to the opening of the notch and can be operated also in the notch. 4. A second throttle chamber formed by attaching a third main plate to the second main plate on a side opposite to the first main plate, wherein at least one throttle member is reciprocally operably mounted. The third base plate is formed with a cutout having an opening larger than the opening for exposure so that a part of the opening is opposed to the opening for exposure. An opening capable of being exposed to the optical path is formed, and at least one aperture member has an optical filter plate attached to a surface on the notch side of the third base plate so as to close the opening. 2. The diaphragm device for a camera according to claim 1, wherein an optical filter plate is always opposed to an opening of the cutout portion, and can be operated even in the cutout portion. 5. At least one shutter blade is reciprocally mounted in a shutter chamber formed between one of the ground plates and a shutter ground plate outside the diaphragm chamber, and the exposure opening is provided. The opening is formed on one of the first base plate and the shutter base plate, and the other has an opening that is the same as or larger than the opening for exposure at a position facing the opening for exposure. So that
The diaphragm device for a camera according to any one of claims 1 to 4, wherein the shutter device is unitized with the shutter.