JPH11326988A - Camera shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage and deformation of an actuating pin and a linkage member, in a shutter constituted so that the linkage member is actuated in a direction where it crosses an optical axis, so as to execute the opening/ closing operations by shutter blades, linked with the actuating pin reciprocated with a moving type motor. SOLUTION: A thin annular linkage member 4 is reciprocated to execute the opening/closing operations by the shutter blades 5, 6 and 7. The linkage member 4 is actuated upward by a spring 16 and downward by the actuating pin 15a integrated to the rotor 14 of a motor. The linkage member 4 is integrally caulked with a plate-like protective member 8 through a fixing member 9 and comes into contact with the actuating pin 15a, in a state where the made to be end surfaces of the linkage member 4 and the protective member 8 are flush. Therefore, even if the actuating pin 15a is made of a comparatively unrigid material, the contact is executed in a wide surface, so that the damage is prevented and the deformation of the linkage member 4 can be prevented as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter in which a plurality of shutter blades open and close a circular exposure opening by reciprocating operation.

[0002]

2. Description of the Related Art This type of shutter is generally called a lens shutter, and is used for exposure operation.
A plurality of shutter blades open the opening for exposure from the center of the optical axis and then close toward the center of the optical axis. During the operation, it is ideal that the plurality of shutter blades can always maintain a substantially circular opening shape. So, in the old days,
Three or more shutter blades are arranged at equal intervals around the exposure opening, and they are operated by a drive ring that reciprocates around the optical axis.

However, in such a shutter, since the drive ring is arranged in a groove formed over the entire circumference with respect to the shutter base plate surface, the processing cost is increased, and the plane friction resistance is not affected. As a result, extremely large peripheral frictional resistance is generated, and there is naturally a limit to speeding up. For this reason, recently, in order to satisfy the above-mentioned opening shape and to be able to cope with miniaturization and high-speed operation, three or more shutter blades are connected to an operating member called a link member made of a thin plate material. Attention has been paid to a shutter having a configuration in which a link member is reciprocated in a direction crossing the optical axis, and shutter blades are opened and closed.

On the other hand, a coil spring has long been used as a drive source for a shutter blade, but recently, a motor has been used as a drive source from the viewpoint that it is not necessary to set a shutter drive mechanism for each photographing. Things to do have increased. At the beginning, the use of stepping motors attracted attention as a type of motor, but stepping motors are problematic in that they are difficult to miniaturize and are expensive. Attention has been paid to the use of a low-cost and easy-to-minimize moving magnet type motor that reciprocates a (usually two-pole) rotor within a predetermined angle range. I have.

Under such circumstances, a link member connecting three or more shutter blades has been reciprocated in a direction transverse to the optical axis in conjunction with the operation of the moving magnet type motor. Camera shutters have been proposed. The present invention relates to such a type of camera shutter.

[0006] The moving magnet type motor has the above-mentioned advantages, but is inferior in startability to a stepping motor, and requires a long time from the start of energization until a predetermined driving force is obtained. There is a problem that the force is easily influenced by a slight variation in the load. Further, the driving force is easily influenced by a change in voltage. Therefore, in the case where a link member connecting three or more shutter blades is operated by a moving magnet type motor, such as a shutter targeted in the present invention, various problems must be solved. For this reason, the present applicant has proposed a configuration for solving those problems in Japanese Patent Application Laid-Open No. H10-96974.

According to the invention described in this publication (hereinafter referred to as a conventional example), the end face of the link member in the opening operation direction (the direction in which the shutter blade is operated to perform the opening operation) is provided with an end face of the motor. Because the spring contacts the pin (operating pin) of the operating member integrated with the rotor and is urged in the opening operating direction by the spring, when the operating pin starts operating in the opening operating direction, the force of the spring is linked. The actuation pin is applied via the end face of the member, and the actuation pin will be actuated earlier than if actuated solely by the driving force of the motor by the pin-slot combination. Then, the force of the spring works effectively at the initial stage of the operation start of the motor, and makes up for the poor startability of the motor.

[0008]

However, it has been found that the configuration as in the above-mentioned conventional example causes inconvenience depending on the manufacturing conditions. That is, in order to reduce the load on the moving magnet type motor, it is necessary to reduce the weight of the shutter blades. However, there are cases where it is desired to reduce the thickness of the link member as much as possible. But,
When the working pin is made too thin, in addition to the operating pin slidingly contacting the end face of the link member described above, the operating pin may be temporarily separated from the end face of the link member and contacted again, or the link member may be closed in the closing direction. If the stopper comes into contact at the end of the operation, excessive force will be applied between the end face and the operating pin. It was found that deformation occurred during the superposition, which affected the control of the exposure time.

In particular, recently, it has become common to make the operating pin made of synthetic resin, and the operating pin is made of synthetic resin mixed with magnetic material powder together with the rotor of the motor. Because of the thin end surface of the link member, the working pin is gradually cut off,
If the operating pin is integrally molded with the rotor and the synthetic resin mixed with magnetic material powder, rust may be generated on the shaved part, and proper opening and closing operation of the shutter blades will be obtained. It turned out that I couldn't do it anymore.

Accordingly, the present applicant has filed Japanese Patent Application No. 9-1827.
According to No. 31, a part of a thin link member is bent so that a wide surface of the bent portion is brought into contact with the operating pin, or a cubic protection member thicker than the link member is attached to a part of the link member to protect the link member. A configuration was proposed in which the end face of the member was brought into contact with the operating pin. However, the one that bends a part of the link member,
If the link member is too thin, there is a problem that the bent portion bends to prevent proper operation and that the bent portion is deformed during repeated use. Further, in the case where the cubic protection member is attached to the link member, since the link member is pressed into the slit formed in the protection member, if the link member is too thin, there is no rigidity. There is a problem that it is difficult to press-fit into the related position, and if the press-fitting is loose, the relationship between the two is shifted during repeated use.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to form an annular or circular arc in conjunction with an operating pin reciprocating by a moving magnet type motor. Link member
In a shutter in which three or more shutter blades perform opening and closing operations by reciprocating in a direction crossing the optical axis, even if the link member is thinned, an operating pin or
An object of the present invention is to provide a camera shutter which can be easily manufactured so as not to cause damage or deformation on an end face of a link member which comes into contact with the operation pin.

[0012]

In order to achieve the above object, a camera shutter according to the present invention has a fulcrum portion and a moving point portion, and is disposed around an exposure opening at a predetermined interval. And three or more shutter blades for opening and closing the exposure opening by reciprocatingly rotating at the fulcrum, and having an interlocking portion and rotatably connected to each of the moving points. A thin plate-shaped link member that is formed in an annular or arcuate shape so as to surround the exposure opening and that reciprocates in a direction crossing the optical axis to open and close the shutter blades; A moving magnet type motor that reciprocates in an angle range, performs reciprocating operation by the motor, and contacts an end face of an interlocking portion of the link member from a direction crossing the optical axis and pushes the end face during operation in one direction; Sha An operating pin for causing the blade to perform a closing operation, and a biasing force applied to the link member so that the end face is in contact with the operating pin when the operating pin is operated in the other direction. A spring that causes the blades to perform an opening operation, and a protection member that is overlapped and fixed to the interlocking portion and has a part of its end surface formed on the same surface as the end surface of the interlocking portion and in contact with the operation pin. Be prepared. The configuration of the camera shutter of the present invention is particularly effective when the rotor of the motor and the operating pin are integrally formed of a synthetic resin mixed with a magnetic material powder. In the camera shutter of the present invention, the protection member is formed with a bent portion having the same surface as the end surface of the interlocking portion or a surface protruding beyond the end surface, and the surface of the bent portion is formed. It is preferable to make contact with the operating pin. In this case, the interlocking portion is formed with a concave portion having two end surfaces that are substantially opposed to each other, and the protection member is configured to restrict the movement of the bent portion to the two end surfaces while being restricted by the two end surfaces. The working operation becomes extremely easy if the work is swaged by the interlocking portion. Further, in the camera shutter of the present invention, the interlocking portion is formed with a position regulating hole, and the protection member has a shaft-like shape inserted into the position regulating hole during caulking. Even if an engagement portion for making contact with the jig is formed, the working operation is facilitated.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to three illustrated embodiments. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a plan view showing a shutter closed state, FIG. 2 is an enlarged perspective view showing a main part of FIG. 1, FIG. 3 is a sectional view of a main part of FIG. FIG.
And FIG. 5 shows a second embodiment of the present invention,
FIG. 4 is a perspective view showing only a main part, and FIG. 5 is a sectional view of the main part. 6 and 7 show a third embodiment of the present invention. FIG. 6 is a perspective view showing only a main part, and FIG. 7 is a sectional view of the main part. In addition, about the whole structure in 2nd Example and 3rd Example, the structure shown in FIG. 1 is used. Therefore, in each example,
Common members and parts are denoted by the same reference numerals.

[First Embodiment] First, the structure of the first embodiment shown in FIGS. 1 to 3 will be described. In FIG. 1, a shutter base plate 1 is made of a synthetic resin and has a circular opening 1a centered on an optical axis. Along the outer peripheral edge of the shutter base plate 1, a wall 1b extending toward the near side in FIG. 1 and a wall 1c extending toward the back side in FIG. 1 (see FIG. 3) are formed. Although the illustration of the mounting structure is omitted, as can be seen from FIG. 3, the shutter base plate 1 is attached with an auxiliary base plate 2 and a motor frame 3 both made of synthetic resin.

Of these, the auxiliary base plate 2 has a substantially same plane shape as the shutter base plate 1 and a blade chamber is formed between the auxiliary base plate 2 and the shutter base plate 1, although the overall shape is not explicitly shown. Has an opening similar to the opening 1a, but the exposure opening as a shutter is regulated by the opening 1a. Although the overall shape of the motor frame 3 is not clearly shown, its planar shape is an arc along the periphery of the opening 1a, and a motor chamber is formed between the motor frame 3 and the shutter base plate 1.

As shown in FIG. 1, an annular link member 4 and three shutter blades 5, 6, and 7 are arranged in the blade chamber. The link members 4, the shutter blades 5, the shutter blades 6, and the shutter blades 7 are directed toward them. In the assembled state, a portion (not shown) provided on the auxiliary base plate 2 pushes the shutter blades 7 lightly toward the shutter base plate 1. The link member 4 has a recess 4a, an engaging portion 4b, three overhangs 4c, 4d, 4e, and three long holes 4f, 4g, 4h.
The region where a is formed is the interlocking portion in the present invention.

A protective member 8 is attached to an interlocking portion of the link member 4 by a fixing member 9. The fixing member 9 is a rivet component. As shown in FIG. 3, the protection member 8 and the link member 4 are overlapped, and the protection member 8 is inserted into holes formed in the protection member 8 from the protection member 8 side, and caulked on the link member 4 side. Both are integrated. A hole 4i is formed in the link member 4 and a fork-shaped engaging portion 8a is formed in the protective member 8. This is used to fit a rod-shaped jig into them when caulking is performed. This is for preventing the protection member 8 from oscillating with respect to the link member 4. In the present embodiment, the protection member 8 is overlapped and fixed on the link member 4 as described above. However, when there is a possibility that the end surface of the protection member 8 and the end surface of the link member 4 are not formed on the same surface, After caulking, polishing is further performed so that their end faces are the same. In this embodiment, the surface formed in this way comes into contact with an operation pin described later.

The overhanging portion 4 formed on the link member 4
c, 4d, and 4e are mounted on shelf-shaped receiving portions 1d, 1e, and 1f formed on the shutter base plate 1, respectively.
Further, the slots 4f, 4g, and 4h are respectively provided in the shutter base plate 1
Are loosely fitted to the shafts 1h, 1g, and 1i provided upright, so that the operation of the link member 4 is not restricted by those shafts. In this embodiment, during operation, the link member 4 slides in surface contact with the shutter base plate 1 only with respect to the receiving portions 1d, 1e, and 1f. , Extremely low frictional resistance,
Although it is designed to operate smoothly, the present invention is not limited to this configuration, and does not prevent the provision of the minimum support surface on the shutter base plate 1 and the auxiliary base plate 2 as necessary. Absent.

The shutter blades 5, 6, and 7 have their holes rotatably fitted to the shafts 1g, 1h, and 1i, respectively, and the openings are formed around the shafts 1g, 1h, and 1i as fulcrums. 1a can be opened and closed. Further, each of the shutter blades 5, 6, 7 is connected to a connecting shaft 10,
It is attached to the link member 4 by 11 and 12. Each of the connecting shafts 10, 11, and 12 is a rivet component, and is inserted from the link member 4 side.
6 and 7, the space between the link member 4 and each of the connecting shafts 10, 11, and 12 is movable.
Reference numerals 0, 11, and 12 are moving points of the shutter blades 5, 6, and 7.

In FIG. 1, a photo reflector 13 is mounted on the back of the shutter base plate 1. As is well known, the photo reflector 13 is provided with a light emitting unit and a light receiving unit, and light emitted from the light emitting unit enters the blade chamber through a slit 1j formed in the shutter base plate 1,
The light is reflected by a reflection sheet (not shown) attached to the auxiliary base plate 2 and enters the light receiving unit. A projection 7a is formed at the tip of the shutter blade 7, and this projection 7a is for blocking the optical path of the photoreflector 13 in the initial stage of the opening operation.

In FIG. 1, a moving magnet type motor is mounted on the back side of the shutter base plate 1. Since the configuration of this moving magnet type motor is well known, only the minimum members considered necessary for the description of the present embodiment are shown. As shown in FIG.
Is rotatably supported by the shutter base plate 1 and the motor frame 3, and an operating pin 15 a of an operating member 15 integrally formed with the shutter base plate 1 and the window frame 1 k formed in the shutter base plate 1.
, And comes into contact with the end faces of the link member 4 and the protection member 8 formed on the same surface as described above.

The rotor 14 is made of a permanent magnet (usually two poles), but the operating member 15 and the operating pin 15a are usually made of synthetic resin together with the rotating shaft of the rotor 14. There are many. However, the rotor 14, the operating member 15, and the operating pin 15a in the present embodiment are obtained by mixing neodymium powder, which is a magnetic material, into a nylon-based resin material and integrally molding the same with a mold. The portion is magnetized so as to form a two-pole permanent magnet body.

As shown in FIG. 1, on the rear side of the shutter base plate 1, a shaft 1 provided on the shutter base plate 1 is provided.
A spring 16 is wound around m. One end of the spring 16 is hooked on a spring hook 1n provided on the shutter base plate 1, and the other end is bent and inserted into the blade chamber from the window 1p, and is hooked on the engaging portion 4b of the link member 4. I have. Accordingly, in FIG. 1, the link member 4 is urged by the spring 16 to operate upward. In this embodiment, the shutter blades 5 and 5
Three stoppers 1q that come into contact when 6, 7 are fully opened
1r and 1s are formed.

Next, the operation of this embodiment will be described. FIG. 1 shows the shutter in a closed state.
The end face of the recess 4a and the end face of the protective member 8 are pushed by the operating pin 15a, and are actuated downward against the urging force of the spring 16, so that the projection 7a of the shutter blade 7 contacts the shaft 1g. By touching, the operation is stopped. At this time, the coil of the moving magnet type motor is not energized, but this state is maintained by the magnetic force of the permanent magnet of the rotor 14. The reason is well known, but will be briefly described later.

When the shutter is released in this state, the power switch is first closed and the photo reflector 13 is turned off.
Becomes energized. Thereby, the photoreflector 1
The light emitted from the light emitting section 3 into the blade chamber is
The light is reflected by a reflection sheet (not shown) attached to the photoreceptor and enters the light receiving portion of the photo reflector 13. After passing through such a preparation state, when the coil of the moving magnet type motor is energized in the forward direction, the maintenance force of the rotor 14 in the closed state by the permanent magnet is lost, and the rotor 14 Rotate counterclockwise by an angle. Therefore, the operation pin 15a operates upward in FIG.

As described above, in the case of the moving magnet type motor, this operation is initially slow and unstable, but in the present embodiment, the urging force of the spring 16 is applied to the link member 4. Is pushed upward, the link member 4 operates by positively pushing the operating pin 15a, rather than simply following the operating pin 15a. Therefore, even if a moving magnet type motor is used,
The initial operation of the link member 4 is relatively fast and stable. The upward movement of the link member 4 is performed by supporting the fulcrums of the shutter blades 5, 6, and 7 (shafts 1g, 1h,
Since the distance between the position 1i) and the moving point portion (the positions of the connecting shafts 10, 11, 12) is invariable, strictly speaking, the arc is drawn.

As described above, when the link member 4 starts operating upward, the shutter blades 5, 6, 7 also start to rotate counterclockwise about the shafts 1g, 1h, 1i, respectively. Then, if the projection 7a of the shutter blade 7 interrupts the optical path of the photoreflector 13 before the pinhole state, the exposure time control circuit is started by the output signal. Thereafter, the shutter blades 5, 6, and 7 bring the opening 1a into a pinhole state and open the opening 1a around the optical axis. After full opening, the end faces in the operation direction are respectively stopped by stoppers 1q, 1r, Stop by contacting 1s. However, the operating pin 15a continues to operate slightly thereafter, and stops when it comes into contact with the upper edge of the window 1k.

Thereafter, when a predetermined time has elapsed, the coil of the moving magnet type motor is energized in the opposite direction to the above by the output signal from the exposure time control circuit, and the rotor 14 rotates clockwise. Is done. for that reason,
The operating pin 15a operates downward in FIG. 1 and comes into contact with the end surface of the concave portion 4a of the link member 4 and the end surface of the protection member 8.
At this time, if the protection member 8 is not attached to the link member 4 and the operation pin 15a is made of a relatively brittle material as in this embodiment, the operation pin 15
a may be slightly damaged by the thin end face of the concave portion 4a every time the actuator is operated, but according to the present embodiment, such a phenomenon occurs because the contact portion of the operating pin 15a is formed thick. do not do.

Therefore, the operating pin 15a operates the link member 4 downward against the urging force of the spring 16,
In the process, the operating pin 15a slides with the end face in contact. However, this sliding is caused by the spring 1
6 is performed against the urging force of No. 6, and therefore receives relatively large frictional resistance. Therefore, when the protection member 8 is not attached to the link member 4, the operating pin 15a may be slightly damaged by the thin end face of the concave portion 4a every time the operation is performed. However, such a phenomenon does not occur because the contact portion of the operation pin 15a is formed thick.

The downward movement of the link member 4 causes the shutter blades 5, 6, and 7 to move the shafts 1g and 1g, respectively.
The shutter blades 7 are rotated clockwise at h and 1i, and after closing the opening 1a, stop when the projection 7a of the shutter blade 7 comes into contact with the shaft 1h. A large force acts between the two end surfaces of the link member 4 and the protection member 8 and the operating pin 15a due to the impact force generated at this time. In this case also, in this embodiment, the recess 4a Since the thickness is greater than when only the end face is provided, the link member 4 and the operating pin 15a are not damaged or deformed by the impact force. Thus, the state where the link member 4 and the shutter blades 5, 6, 7 are stopped is the state shown in FIG.

In this embodiment, the shutter blade 7 is
h, the link member 4 may alternatively stop by contacting a stopper provided at an appropriate position. And even in such a configuration, an impact force is generated, but as long as the protection member 8 is attached to the link member 4,
Substantially the same effects as in the present embodiment can be obtained. Further, a configuration may be employed in which the operation pin 15a comes into contact with the lower end edge of the window 1k and stops. In this case as well, the reaction of the inertial force acting on the link member 4 and the shutter blades 5, 6, 7 also produces an impact force between the two end faces and the operating pin 15a. Accordingly, the link member 4 and the operating pin 15a are not damaged or deformed.

After the respective members return to the state shown in FIG. 1, the energization of the coil of the moving magnet type motor is cut off. However, even if the energization is cut off, the rotor 14 is a permanent magnet. The rotation position is maintained by a well-known configuration, and the closed state of the opening 1a is maintained until the next photographing is performed. That is, when the coil is not energized, the equilibrium position of the rotor 14 is set to a position further rotated clockwise than the rotation position shown in FIG.
In addition, the magnetic force by the rotor 14 is larger than the urging force of the spring 16. Therefore, in the state of FIG. 1, the link member 4 is pushed downward against the force of the spring 16 even when the coil is not energized.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS.
Is drawn corresponding to FIGS. 2 and 3 described above. Further, since the present embodiment is different from the first embodiment only in the shape of the protection member 8, the entire configuration shown in FIG. 1 is also applied to this embodiment except for the protection member 8. .
Accordingly, the description of the overall configuration and operation will be omitted, but the matters described in the description of the first embodiment in relation thereto are all applied to the present embodiment.

In the structure of this embodiment, as in the first embodiment, the protection member 18 and the link member 4 are overlapped, and the fixing member 9 is inserted from the protection member 18 side into holes formed in them. The protection member 18 is fixed to the link member 4 by swaging on the link member 4 side. Further, a hole 4i is formed in the link member 4 and a fork-shaped engaging portion 18a is formed in the protective member 18, which is formed by caulking just like in the first embodiment. This is because the relative positioning between the two is performed using a rod-shaped jig.

The protection member 18 of the present embodiment is different from the protection member 8 of the first embodiment in that a bent portion 18b is formed at a portion protruding into the recess 4a, and only the bent portion 18b is actuated by an operating pin. 15a. With this configuration, the surface in contact with the operation pin 15a can be made wider than in the case of the first embodiment.
There is no damage at 5a. Further, if the protection member 18 is too thin, the protection member 8 and, consequently, the link member 4 may be deformed during operation, similarly to the case where the bent portion is formed directly on the link member 4. In the case of the example, since the area other than the area forming the bent portion 18b is overlapped and fixed on the link member 4, a predetermined rigidity and strength are secured in the interlocking portion with the operating pin 15a. And that does not happen. Also, the link member 4
In the case where there is such a concern due to the method of superimposition and the material, etc., and particularly when there is a concern about the deformation of the bent portion 18b due to repeated use, by increasing the thickness of the protective member 18, Such a situation can be avoided.

Although the bent portion 18b is bent toward the auxiliary base plate 2 in the present embodiment, the bent portion 18b may be bent toward the shutter base plate 1 on the contrary. In this embodiment, only the bent portion 18b of the protection member 18 is brought into contact with the operating pin 15a, but the end surface of the link member 4 may be brought into contact. However, in this case, the end surface of the link member 4 and the surface of the bent portion 18b must be formed on the same surface, and it is necessary to form the two members so that there is no gap between them. Absent.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7
Shows only the main part of this embodiment, as in the case of the second embodiment. Also, in the case of the present embodiment, the only difference is the shape of the protection member 8 described in the first embodiment. Therefore, the entire configuration shown in FIG. The same members and the same parts as in the first embodiment are denoted by the same reference numerals. Accordingly, the description of the overall configuration and operation will be omitted, but the matters described in the description of the first embodiment in relation thereto are all applied to the present embodiment.

In this embodiment, the protection member 28 is caulked to the link member 4 by the fixing member 9, but unlike the above embodiments, the fixing member 9 is Is inserted from the link member 4 side and caulked. The bent portion 28a is not bent toward the auxiliary base plate 2 but is bent toward the shutter base plate 1. The operation and effect of forming such a bent portion 28a are substantially the same as those of the second embodiment. Therefore, what has been described in relation to the bent portion 18a in the description of the second embodiment also applies to this embodiment.

Further, in this embodiment, unlike the above embodiments, the link member 4 does not have the hole 4i, and the protection member 28 has the fork-like engaging portions 8a, 18a.
a is not formed. However, in the case of this embodiment,
Even if they are not formed, the relative positioning between the link member 4 and the protection member 28 can be performed during swaging. That is, as can be seen from FIG. 6, the shape of the concave portion 4a of the link member 4 is formed by two end surfaces that are substantially parallel and opposed to each other, and one end surface that faces the bent portion 28a. . Therefore, since the movement of the bent portion 28a is restricted by the two end faces facing each other, the protection member 28 does not rotate around the fixing member 9 and the caulking becomes easy. I have.

In each of the above embodiments, it is assumed that the link member 4 is annular, but the present invention is not limited to such a shape. For example, FIG.
And a connecting portion with the shutter blade 5 and the shutter blade 6
It is also possible to leave a connection portion with the above and form an arc shape with a gap between them. In this case, the shape is such that the opening 1a is surrounded by about 240 degrees. Further, the number of shutter blades may be four or more. If the number is four, the link member 4 may have a shape surrounding the opening 1a by about 270 degrees. However, the present invention
The invention is not limited to the case where the shutter blades are arranged at equal intervals.

Further, in FIG. 1, the spring 16 is attached to the shutter base plate 1 outside the blade chamber. However, the present invention is not particularly limited to such a configuration. It may be attached to the auxiliary base plate 2 or may be attached to the auxiliary base plate 2 outside the blade chamber. In each embodiment, the operating member 15 is formed integrally with the rotor 14. However, the operating member 15 is mounted on the shutter base plate 1 and reciprocated in conjunction with the rotation of the rotor 14. It does not matter. Further, in each embodiment, the way in which the link member 4 and the protection members 8, 18, and 28 are overlapped may be reversed.

[0042]

As described above, according to the present invention, the link member formed in an annular or arcuate shape so as to surround the opening for exposure is interlocked with the operating pin reciprocally operated by the moving magnet type motor, In a shutter in which three or more shutter blades are opened and closed by reciprocating in a direction transverse to the optical axis, the link member is provided with a spring for urging in the opening operation direction, and the link member is operated with the spring. Because the pins can be contacted and the protection means is caulked to a part of the link member that comes into contact with the operating pin, no damage or deformation occurs to those contact portions, and furthermore, the shutter blades It is possible to realize a camera shutter having good operation characteristics.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention, showing a shutter closed state.

FIG. 2 is an enlarged perspective view showing a main part of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part of FIG.

FIG. 4 is a perspective view showing only a main part of the second embodiment.

FIG. 5 is a sectional view of a main part of the second embodiment.

FIG. 6 is a perspective view showing only a main part of the third embodiment.

FIG. 7 is a sectional view of a main part of a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Opening 1b, 1c Wall 1d, 1e, 1f Receiving part 1g, 1h, 1i, 1m Axis 1j Slit 1k, 1p Window 1n Spring hook 1q, 1r, 1s Stopper 2 Auxiliary base plate 3 Motor frame 4 Link member 4a recess 4b engaging portion 4c, 4d, 4e overhanging portion 4f, 4g, 4h elongated hole 4i hole 5, 6, 7 shutter blade 7a projecting portion 8, 18, 28 protective member 8a, 18a engaging portion 9 fixing member 10 , 11, 12 Connecting shaft 13 Photoreflector 14 Rotor 15 Operating member 15a Operating pin 16 Spring 18b, 28a Bent portion

Claims (5)

[Claims] 1. An opening / closing operation of the exposure opening by reciprocatingly rotating at the fulcrum at a predetermined interval and each having a fulcrum and a moving point. And three or more shutter blades for performing the above operation, and an interlocking portion, and are rotatably connected to each of the moving point portions, and are formed in an annular or arc shape so as to surround the exposure opening. A thin plate-like link member that causes each of the shutter blades to open and close by reciprocating in a direction transverse to an axis; a moving magnet type motor that reciprocates in a predetermined angle range; An operation pin that contacts the end face of the interlocking portion of the link member from a direction crossing the optical axis and presses the end face during operation in one direction to cause the shutter blade to close, and an operation pin in the other direction. In this case, the link member is urged to operate in a state in which the end face is in contact with the operation pin, whereby a spring that causes the shutter blade to perform an opening operation is overlapped with the interlocking portion and caulked and stopped. A camera shutter, comprising: a protection member that has a part of an end surface formed on the same plane as an end surface of the interlocking portion and is in contact with the operating pin. 2. The camera shutter according to claim 1, wherein the rotor of the motor and the operating pin are integrally formed of a synthetic resin mixed with a magnetic material powder. 3. The protection member is provided with a bent portion having the same surface as the end surface of the interlocking portion or a surface protruding beyond the end surface, and the surface of the bent portion comes into contact with the operation pin. The camera shutter according to claim 1, wherein 4. A concave portion having two end faces substantially opposed to each other is formed in the interlocking portion, and the protection member restricts the movement of the bent portion by the two end surfaces. The camera shutter according to claim 3, wherein the shutter is caulked by the interlocking portion. 5. A position-controlling hole is formed in the interlocking portion, and a shaft-shaped jig inserted into the position-controlling hole at the time of caulking is formed in the protective member. The camera shutter according to any one of claims 1 to 3, wherein an engagement portion for contacting the shutter is formed.