JPH0954354A - Camera shutter provided with aperture regulating mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera shutter provided with an aperture regulating mechanism suitable for attaining miniaturization and high accuracy, with a simple constitution. SOLUTION: A pulse motor 11 capable of rotating forward and backward is rotated from an initial position shown in the figure, based on the set information of a photographic lens. When the motor 11 is rotated clockwise, the driving pin 12a of a driving member 12 pushes an abutted part 7d, to execute the opening/closing operations of a shutter blade 2 by an opening/closing member 7. Then, the abutted part 5a of a pawl lever 5 is pushed and the motor 11 is finally returned to the initial position and stopped only by the rotation of a shaft 3g. When the motor 11 is rotated counterclockwise, the pawl lever 5 is pushed by the driving pin 12a and the aperture regulating member 3 is turned to the right and restrained in an aperture regulating state by a restraining member 9. After that, the shutter blade 2 is operated to open/close similarly, then, an abutted part 9b is pushed to release the restraining and the motor 11 is returned to the initial position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a shutter blade that reciprocates to open and close, and the aperture diameter of the shutter blade is automatically regulated in accordance with zooming of a photographing lens and setting of a distance. The present invention relates to a camera shutter provided with the above aperture control mechanism.

[0002]

2. Description of the Related Art In recent years, an increasing number of compact cameras having a built-in lens shutter are equipped with a zooming device for a photographing lens. There are two types of variable power devices: one that moves a part of the lens of the taking lens system continuously in the direction of the optical axis and one that switches the lens system between tele and wide. Change and the depiction performance deteriorates, so when shooting telephoto, narrow down the lens aperture,
It is known to obtain good images. Further, it is known that the lens aperture is narrowed down according to the distance information so as to have a function of correcting aberrations for photographing. On the other hand, with the advancement of the control technology of sherers and the development of photosensitive materials, many lens shutters have been realized in which a shutter blade is not provided with an independent diaphragm mechanism and the aperture is restricted.

Under such circumstances, JP-A-2-254428 and JP-A-2-254431 propose a device in which the aperture diameter of the shutter blade is regulated in accordance with the zooming operation position of the taking lens. ing.
In those proposals, the shutter device is arranged on a substrate having a substantially circular outer shape, the zoom ring is arranged along the circumference of the substrate, and the opening / closing member of the shutter blade is It collides with a regulation cam formed on the zoom ring or collides with a regulation cam on the substrate whose position is controlled by the cam formed on the zoom ring, the operation amount in the opening direction is controlled, and the opening of the shutter blade is controlled. The caliber is regulated.

[0004]

However, in the above two proposed configurations, the zoom ring and the substrate of the shutter are moved relatively, so that it is necessary to provide a gap between them. is there. Therefore, there is a problem in that it is necessary to take light leakage into consideration in design, and the cost is increased by providing necessary light shielding means. Furthermore,
Since the cam is formed on the zoom ring, there is a problem that the inner diameter of the zoom ring must be increased or the design of the shutter structure on the substrate is restricted. Furthermore, when the shutter opening / closing member performs the opening operation, it collides with the regulating member at a predetermined aperture position, so that the shutter blade bounces at the opening position, and it is extremely difficult to improve the exposure accuracy. is there.

The present invention has been made in order to solve such a problem, and its purpose is not to continuously regulate the aperture as in the above-described conventional example, but to take a photographing lens. One aperture regulation is performed according to the predetermined setting information of the camera, the camera has a simple structure, is suitable for downsizing, and is provided with an aperture regulation mechanism of good exposure accuracy without affecting the operation of the shutter blades. Is to provide.

[0006]

In order to achieve the above-mentioned object, a camera shutter provided with an aperture regulating mechanism of the present invention comprises a drive member which is rotated by a shutter release and a forward movement is moved by the drive member. An opening / closing member that opens and closes the shutter blades by being moved by a spring, and an opening restricting member that moves the aperture to the opening restricting position by the drive member and a returning motion that is moved by the spring, and the opening. The locking member is locked at the opening restriction position, and the locking is released by the driving member. The locking member corresponds to a setting signal of the photographing lens, and the locking member is operated during the operation of the opening / closing member. The opening regulating member can be locked at the opening regulating position.

Further, the camera shutter provided with the aperture regulating mechanism of the present invention preferably comprises a pulse motor which rotates normally or reversely in response to a setting signal of the photographing lens, and the pulse motor is driven by the normal rotation. The driving member is rotated in the forward direction and in the reverse direction by rotating the member in the forward direction, and the locking member regulates the opening of the opening regulating member during the operation of the opening / closing member only in one of the rotations. Be able to lock in position. Further, in the camera shutter provided with the aperture regulation mechanism of the present invention, the exposure time is preferably controlled by changing the pulse width of the drive current of the pulse motor.

[0008]

In the initial state before photographing, the shutter blade has the aperture closed by the opening / closing member. The opening regulating member is in the non-opening regulating position and is not locked by the locking member. When the camera is aimed at the subject and the taking lens is set at a predetermined setting position and then the shutter is released, the drive member starts rotating in the forward direction. When the photographing lens is set at the telephoto position, for example, the drive member first moves the aperture regulating member to the aperture regulating position and locks the aperture regulating member at the position. Next, the drive member causes the opening / closing member to reciprocate to open / close the shutter blade. After the shutter blades are closed, the driving member releases the locking of the locking member, returns the opening regulating member to the original position, and then returns to the initial position.

In the above case, when the drive member is configured to rotate only in the forward direction, an intermediary member that faces the operation range of the drive member only when not set to the telephoto position by the setting signal of the photographing lens is used. Just before the drive member reciprocates the opening / closing member, the driving member releases the locking of the locking member via the intermediary member to return the opening restricting member to the original position. Further, when the driving member is configured to be rotated in the forward direction or the reverse direction by the pulse motor capable of rotating in the forward and reverse directions, the driving member sets the setting signal when the photographing lens is not set to the telephoto position. Is rotated in the opposite direction, and the opening / closing member is simply reciprocated to return to the original position. In the latter case, the exposure time is
It is adjusted by changing the pulse width to the pulse motor.

[0010]

【Example】

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 9.
FIG. 1 is a plan view showing the initial state of the shutter of this embodiment. 2 to 4 are plan views for explaining the operation when the aperture is not restricted. FIG. 2 shows a state in which the drive member is rotated 90 degrees clockwise, and FIG. The moved state is shown in FIG. 4, which is similarly rotated by 270 degrees. 5 to 8 are plan views for explaining the operation when the aperture is restricted. FIG. 5 shows a state in which the drive member is rotated 90 degrees counterclockwise, and FIG. 7 is the same as that of FIG.
Similarly, FIG. 8 shows a state of being rotated by 315 degrees. FIG.
6A and 6B are time charts showing opening and closing operations of the shutter blades. FIG. 7A shows a case where the width of the pulse supplied to the pulse motor is wide, and FIG.

First, the configuration of this embodiment will be described with reference to FIG. An aperture 1a and a slot 1b are formed in the shutter base plate 1 (the outer shape is omitted in the drawing). On the surface side of this shutter base plate 1, shafts 1d, 1e,
1f is planted and stopper pins 1g, 1
h, 1i are planted. A shutter blade 2 is rotatably attached to a pin 1j planted on the back surface of the shutter base plate 1. As is well known, the shutter blades 2 are symmetrically arranged with the positions of the slots 2a being substantially common.
Although one sheet is arranged, only one shutter blade is shown for the convenience of the drawing.

An opening regulating member 3 is rotatably attached to a shaft 1d of the shutter base plate 1, and a spring 4 imparts a left turning property. The opening regulating member 3 has three arms 3a, 3b, 3c, an opening 3d is formed at the tip of the arm 3a, and a hook 3e is formed at the tip of the arm 3b. In addition, a bent portion 3f is formed on the arm portion 3c. Further, a claw lever 5 having an abutting portion 5a is rotatably attached to a shaft 3g planted in the arm portion 3c, and a right turning property is imparted by a spring 6, but in FIG. Turn the right turn 3f
Have been thwarted by.

An opening / closing member 7 is rotatably attached to the shaft 1e of the shutter base plate 1, and a left turning property is imparted by a spring 8. This opening / closing member 7 has two arms 7
a and 7b. A pin 7c is planted in the rear surface direction at the tip of the arm portion 7a, penetrates the slot 1b, and is fitted into the slot 2a of the shutter blade 2 on the rear surface of the shutter base plate 1. This pin 7c has another one not shown.
It goes without saying that the shutter blades are also fitted in the slots of the shutter blades. On the other hand, a contact portion 7d is formed at the tip of the arm portion 7b.

A locking member 9 is rotatably attached to the shaft 1f of the shutter base plate 1, and a left turning property is imparted by a spring 10. A locking portion 9a that engages with the hook portion 3e is formed at the tip of the locking member 9, and a contact portion 9b is formed in the middle. A forward / reverse pulse motor 11 is attached to the shutter base plate 1, and a drive member 12 is attached to its output shaft 11a. The drive pin 12a implanted in the drive member 12 can come into contact with the above-mentioned contact portions 5a, 7d, 9b when the drive member 12 rotates.

Next, the operation of this embodiment will be described. Prior to shooting, operate the taking lens to set the shooting frame. This setting information is divided into a setting signal for the telephoto region and a setting signal for the non-telephoto region of the photographing lens, and is transmitted to a control circuit (not shown) at the time of photographing. If the setting signal is a setting signal for the telephoto area, the pulse motor is rotated counterclockwise in FIG. 1, and if it is a setting signal for the non-telescopic area, it is rotated clockwise. Therefore, first, a case where a setting signal of the non-telephoto region is given to the control circuit by the setting of the photographing lens will be described with reference to FIGS.

When the release button of the camera is pressed after setting the taking lens, first, the power supply of the control circuit is closed to activate the photometric circuit and the setting signal of the taking lens is given. Then press the release button deeper
A signal for starting photography is given to the control circuit, and the pulse motor 11 is rotated clockwise by energization with a pulse width corresponding to the measurement result of the photometric circuit, that is, at a speed corresponding to the measurement result. With this rotation, the drive pin 12a of the drive member 12 first pushes the contact portion 9b against the spring 10,
After rotating the locking member 9 clockwise, the locking member 9 is rotated 90 degrees to reach the position shown in FIG. In this state, the locking member 9 has already been turned counterclockwise by the spring 10, stopped by the pin 1i, and returned to the original position.

When the drive member 12 further rotates, the drive pin 12a pushes the contact portion 7d of the opening / closing member 7. Therefore, the opening / closing member 7 is rotated clockwise against the spring 8, and the shutter blade 2 is operated by the pin 7c to open the aperture 1a. FIG. 3 shows a state in which the aperture 1a is fully opened by rotating 180 degrees from the initial position of FIG. afterwards,
When the drive pin 12a is still rotated, the opening / closing member 7 is rotated by the spring 8
The shutter blade 2 is rotated counterclockwise to close the shutter blade 2 and then is stopped by the pin 1h to return to the original position.

FIG. 4 shows a state in which the drive member 12 is further rotated and the drive pin 12a is in contact with the contact portion 5a of the pawl lever 5 at a position of 270 degrees from the initial position.
When the drive member 12 further rotates from this state, the drive pin 12a pushes the pawl lever 5, but since the force of the spring 6 is weaker than the force of the spring 4, the pawl lever 5 moves the spring 6 on the shaft 3g.
Is counterclockwise against the power of. Therefore, the aperture regulating member does not move at all. After that, when the drive pin 12a passes by, the pawl lever 5 is turned right by the spring 6, and the right turn is turned to the bent portion 3
It is returned to the original position by being blocked by f. Then, finally, the drive member 12 makes one rotation and the drive pin 12a
1 reaches the position shown in FIG. 1, the pulse motor 11 is stopped and a series of exposure operations is completed.

Next, the operation when the setting signal of the telephoto area is given to the control circuit by the setting of the photographing lens is shown in FIG.
And FIG. 5 to FIG. When the release button of the camera is pressed after setting the taking lens, photometry of the subject is performed in the same manner as in the above case, and the measurement signal and the setting signal are given to the control circuit. Next, when the release button is pushed further deeply, a signal for starting photography is given to the control circuit, and the pulse motor 11 is rotated counterclockwise by energization with a pulse width corresponding to the measurement result of the photometric circuit. By this rotation, the drive pin 12a of the drive member 12 first pushes the contact portion 5a of the claw lever 5. Therefore, the claw lever 5 pushes the bent portion 3f to rotate the opening regulating member 3 rightward against the spring 4.

When the opening restricting member 3 rotates rightward and reaches just before the position shown in FIG. 5, the tip of the hook portion 3e pushes the tip of the engaging portion 9a, and the engaging member 9 resists the spring 10 to the right. To swirl.
However, such a relationship between the hook portion 3e and the locking portion 9a is temporary due to the difference in the respective operating loci and is immediately released, so that the locking member 9 is returned by the spring 10. At this time, the pushing amount of the claw lever 5 by the drive pin 12a reaches the peak almost at the same time, so that the opening regulating member 3
Right-handed rotation is also stopped, and the hook portion 3e and the locking portion 9a are brought into an engaged state as shown in FIG. Therefore, in this state, the counterclockwise rotation of the aperture regulating member 3 is blocked by the locking member 9, and the aperture diameter of the aperture 1a is equal to that of the aperture regulating member 3.
The opening diameter in this case is the diameter of the opening 3d.

When the drive member 12 further rotates, the drive pin 12a pushes the contact portion 7d of the opening / closing member 7. Therefore, the opening / closing member 7 is rotated rightward against the spring 8 and causes the shutter blade 2 to open by the pin 7c. FIG. 6 shows a position in which the drive member 12 is rotated 180 degrees from the initial position in FIG. 1, and in this state, the shutter blades fully open the opening 3d and are at the final position of the opening operation. After that, when the drive pin 12a still rotates, the opening / closing member 7 is rotated counterclockwise by the spring 8 to close the shutter blade 2 and then stopped by the pin 1h to return to the original position. Then, FIG. 7 shows a state in which it is rotated 270 degrees counterclockwise from the initial position.

When the drive member 12 further rotates from the state shown in FIG. 7, the drive pin 12a pushes the contact portion 9b of the locking member 9 and rotates the locking member 9 against the spring 10 to the right. Therefore, the engagement of the hook portion 3e by the engagement portion 9a is released, and the opening regulating member 3 is returned to the original position by the spring 4. The state at this time is shown in FIG. 8, and the driving member 12 is shown in FIG.
It is a position rotated 315 degrees counterclockwise from the initial position. After that, when the drive pin 12a passes by, the locking member 9 is rotated counterclockwise by the spring 10 and returns to the original position.
Then, finally, the drive member 12 makes one rotation and the drive pin 1
When 2a reaches the position shown in FIG. 1, the pulse motor 11 is stopped and the series of exposure operations is completed.

In the above description, the pulse motor 11
Have been rotated by energization with a pulse width corresponding to the measurement result of the photometric circuit, that is, at a speed corresponding to the measurement result. This point will be described in detail with reference to FIG. First, consider with reference to FIG. This figure is
It indicates that the shutter blade 2 is opened by one pulse having a pulse width of Xms applied to the coil A, and the shutter blade 2 is closed by one pulse having a pulse width of Xms applied to the coil B. . This means
The drive pin 12a of the drive member 12 contacts the contact portion 7 of the opening / closing member 7.
This means that it took Xms from when the shutter blade 2 was pressed to start moving to the state shown in FIGS. 3 and 6.

When the measurement result of the subject light by the photometry circuit is stronger than that shown in FIG. 7A, the operation of the shutter blade 2 is performed as shown in FIG. In this case, the pulse width of one pulse is shorter than Xms by Ams (X
-A) ms. That is, the drive pin 12 of the drive member 12
a presses the contact portion 7d of the opening / closing member 7 and starts moving the shutter blades 2 until the state shown in FIGS. 3 and 6 is reached (X
-A) ms is required, and the closing operation is the same. Further, the interval between the pulses of the coils A and B is also shortened at a predetermined ratio. Therefore, the exposure time becomes short. Therefore, when the setting signal of the photographing lens is given to the control circuit by the setting of the photographing lens, that is, when the photographing is performed using the opening 3d of the aperture regulating member 3, the same idea as above is applied. , The coil A, on the contrary, as the opening diameter becomes smaller,
The interval between the B pulses is widened to increase the exposure time.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. The configuration of the present embodiment is similar to the configuration of the first embodiment in most points, so the same configuration as that of the first embodiment is
The same reference numerals are given, the description thereof is omitted, and only different points will be described. First, in this embodiment, the claw lever 5 in the first embodiment is not provided. Therefore, the spring 6 is not provided, and the opening restricting member 3 is not provided with the bent portion 3f. Therefore, instead of the contact portion 5a of the claw lever 5, the contact portion 3h is formed on the arm portion 3c of the opening regulating member 3.

The intermediary member 13 has a contact portion 13a, a slot 13b, and a pin 13c, and the slot 13b is fitted to the shaft 1m planted in the shutter base plate 1. The intermediary member 13 is imparted with a left-handed habit by a spring 15 at an axis of 1 m, but the left-handedness is prevented by a stopper pin 1n implanted in the shutter base plate 1, and another spring is provided. 16 is urged to the upper right of the drawing, one end of the slot 13b in the longitudinal direction is in contact with the shaft 1m to prevent its movement. The intermediary member 13 is in contact with the pin 9c of the locking member 9 in the figure.

Further, the shutter base plate 1 has a plunger 14
Is attached. The plunger 14 moves the mover 14a in the arrow direction against the biasing force of a built-in spring when energized. The mover 14a is in contact with the pin 13c, and when the plunger 14 is energized, the mover 14a pushes the pin 13c and moves the intermediary member 13 against the spring 16 to the lower left in the drawing. The plunger 14 is energized when the photographing lens is set in the telephoto area, and in that case, the contact portion 13a of the intermediary member 13 moves to the outside of the operation locus of the drive pin 12a. Become. Further, the drive member 12 in the present embodiment is configured to rotate only in the counterclockwise direction, not in the clockwise direction.

Next, the operation will be described. It should be noted that although a plurality of drawings showing respective operating positions are not prepared in the present embodiment unlike the first embodiment, the following description will be easily understood in consideration of the operation description of the first embodiment. it can. Also in the case of the present embodiment, in the initial position, the drive pin 12a is at the position shown by the alternate long and short dash line, as in the case of the first embodiment. First, the case where the taking lens is set in the non-telephoto region will be described. When the release button of the camera is pressed after setting the taking lens, the power is closed and the photometric circuit is activated, and at the same time the above-mentioned taking lens setting signal is given to the control circuit. When the release button is pushed further deeply, a signal for starting photography is given to the control circuit, and the pulse motor 11 is rotated counterclockwise by energization with a pulse width corresponding to the measurement result of the photometric circuit.

By the rotation of the pulse motor 11, the drive pin 12a of the drive member 12 first pushes the contact portion 3h to rotate the opening regulating member 3 rightward against the spring 4. After that, the opening restricting member 3 is attached to the engaging portion 9a of the engaging member 9 by the hook portion 3e.
Is locked and the state shown in FIG. 10 is obtained. Therefore, in this state, the opening regulating member 3 is set to the opening regulating position for the time being. When the drive pin 12a further rotates from the position shown in FIG. 10, the drive pin 12a next pushes the contact portion 13a. Therefore, the intermediary member 13 is slightly rotated rightward against the spring 15 by the shaft 1 m. Since the pin 9c is pushed by this right rotation, the hook portion 3e is unlocked by the locking portion 9a, and the opening regulating member 3 returns to the original position.

After that, when the driving member 12 further rotates,
The drive pin 12a pushes the contact portion 7d of the opening / closing member 7. Therefore, the opening / closing member 7 is rotated clockwise against the spring 8 and the pin 7c
The shutter blade 2 is actuated by this to open the aperture 1a without being regulated. When the driving member 12 is subsequently rotated, the opening / closing member 7 is rotated counterclockwise by the spring 8 to close the shutter blade 2 and then the pin 1h.
It is stopped by and returns to the original position. The drive member 12 continues to rotate counterclockwise thereafter, and stops when the drive pin 12a returns to the initial position shown by the alternate long and short dash line. On the way, the drive pin 12a pushes the contact portion 9b of the locking member 9 to cause the locking member 9 to reciprocate, but this does not affect the function.

Next, the operation when the setting signal of the telephoto area is given to the control circuit by the setting of the photographing lens will be described. After setting the taking lens, press the release button on the camera to measure the subject in the same way as above.
The measurement signal and the setting signal are given to the control circuit. When the release button is pressed further deeply, a signal for starting photography is given to the control circuit, and the plunger 14 is first energized, and then the pulse motor 11 is rotated counterclockwise at a speed corresponding to the measurement result of the photometric circuit.

Since the plunger 14 is energized,
The mover 14a is moved in the direction of the arrow and pushes the pin 13c to retract the contact portion 13a from the operation locus of the drive pin 12a.
The opening / closing member 7 is operated without releasing the locked state of 0. Therefore, the shutter blade 2 is opened and closed with the aperture of the opening 3d of the opening regulating member 3. The drive member 12 still continues to rotate in the counterclockwise direction, the drive pin 12a pushes the contact portion 9b of the locking member 9, and the hook portion 3e by the locking portion 9a.
After releasing the lock of, return to the initial position and stop.

In the present embodiment, since the driving member 12 is rotated only in one direction by the pulse motor 11, it is possible to spring-drive the driving member 12 instead of the pulse motor. However, in that case, it is necessary to provide the driving member 12 with an electromagnetic governor or a mechanical governor, which is not advantageous in terms of cost. In addition, in the present embodiment, the mover 14a is the spring 1
6 always contacts the pin 13c, but if the contact portion of the mover 14a is formed into a bifurcated fork and the pin 13c is slidably sandwiched, the above spring 16 is unnecessary. Become.

In each of the above-mentioned embodiments, the case where the aperture is regulated by the information of the image frame size by the zooming of the photographing lens, the lens exchange, the switching of the tele / wide, etc. has been described. As described above, the present invention can also be applied to the case where the aperture is regulated by the distance information.

[0035]

As described above, according to the present invention, there is no restriction on the design arrangement in relation to the taking lens, and there is only one aperture regulation according to the predetermined setting information of the taking lens. The configuration is simple and suitable for downsizing, and the shutter opening / closing member is opened during the opening operation.
Since it does not collide with the regulation member, the desired exposure accuracy can be obtained without affecting the operation of the shutter blades.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a state where the drive member is rotated clockwise by 90 degrees from the state shown in FIG.

FIG. 3 is a plan view showing a state where the drive member is rotated clockwise by 180 degrees from the state shown in FIG.

FIG. 4 is a plan view showing a state where the drive member is rotated clockwise by 270 degrees from the state shown in FIG.

5 is a plan view showing a state where the drive member is rotated 90 degrees counterclockwise from the state of FIG. 1. FIG.

FIG. 6 is a view showing that the driving member is rotated counterclockwise from the state of FIG.
It is a top view which shows the state rotated once.

FIG. 7 is a view showing that the driving member is moved counterclockwise from the state of FIG.
It is a top view which shows the state rotated once.

8 is a view showing the driving member 315 in the counterclockwise direction from the state of FIG.
It is a top view which shows the state rotated once.

9A and 9B are time charts showing opening / closing operations of shutter blades, FIG. 9A shows a case where the width of the pulse supplied to the pulse motor is wide, and FIG. 9B shows a case where the pulse width is narrow.

FIG. 10 is a plan view of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter base plate 2 Shutter blade 3 Opening regulation member 3d Opening part 3e Hook part 3f Bending part 5 Claw lever 3h, 5a, 7d, 9b, 13a Abutting part 7 Opening / closing member 9 Locking member 9a Locking part 11 Pulse motor 11a Output shaft 12 Drive member 12a Drive pin 13 Intermediary member 14 Plunger 14a Mover

Claims (3)

[Claims] 1. A drive member which is rotated by a shutter release, an open / close member for moving a shutter blade open / close by moving a forward movement by the drive member and a backward movement by a spring, and an aperture regulating position for opening. The forward movement is moved by the drive member, and the backward movement is moved by the spring. An opening regulating member and a locking member that locks the opening regulating member at the opening regulating position to release the locking are provided by the driving member. An opening regulation mechanism is provided which is adapted to be capable of retaining the opening regulation member at the aperture regulation position during operation of the opening / closing member in response to a setting signal of a photographing lens. Shutter for camera. 2. A pulse motor for normal rotation or reverse rotation according to a setting signal of a photographing lens, wherein the pulse motor rotates normally to drive the drive member in a forward direction, and the reverse rotation rotates the drive member to reverse direction. 7. The rotating member is rotated, and the locking member can lock the opening restricting member at the opening restricting position during the operation of the opening / closing member only in one of the rotating operations. A camera shutter including the aperture regulation mechanism according to 1. 3. The shutter for a camera having an aperture regulating mechanism according to claim 2, wherein the exposure time is controlled by changing a pulse width of a drive current of the pulse motor.