JP2002055378A - Shutter device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize exposing operation by surely holding a front blade group and a rear blade group at position set before traveling in a shutter device for a camera. SOLUTION: This device is equipped with a front blade group 40 and a rear blade group 50 provided to travel so as to open/close an aperture part 10a, and a front blade electromagnetic driving source 60 and a rear blade electromagnetic driving source 70 directly exerting driving power on the blade groups 40 and 50 at the energizing time and exerting holding power for holding them at the positions set before traveling at the non-energizing time, and provided with an electromagnetic driving source for regulation 80 regulating the movement of the blade groups 40 and 50 by directly engaging with the 1st part to be pressed 45a and the 3rd part to be pressed 55a of the blade groups 40 and 50 and exerting energizing power in the same direction as the holding power when the blade groups 40 and 50 exist at standby positions set before traveling, and performing elimination of the clearance by directly engaging with a 2nd part to be pressed 45b and a 3rd part to be pressed 55b just before the traveling of the blade group 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of cameras such as digital still cameras, silver halide film cameras, range finder cameras, etc. The present invention relates to a shutter device, and more particularly to a camera shutter device of a type in which shutter blades including a front blade and a rear blade are sequentially driven by an electromagnetic drive source and run to perform a shutter operation.

[0002]

2. Description of the Related Art From the viewpoint of simplifying the structure of a camera shutter device, a camera shutter device of a type that directly drives shutter blades using an electromagnetic drive source such as a motor has been developed. In this type of camera shutter device, the driving force generated by the electromagnetic drive source or the holding force for holding the shutter blade at a predetermined position in a non-energized state is small, so that the running operation when the shutter blade runs is unstable. The shutter blades held in the closed position may easily move due to shock or vibration from the outside, or the like, and the opening may be opened at times other than the exposure operation.

[0003] In particular, as a camera shutter device taking measures against the above-mentioned insufficient holding force, for example, Japanese Utility Model Laid-Open No.
What is described in 6-7922 gazette etc. is known. In the camera shutter device disclosed in this publication, when the shutter blade is at a position where the opening is closed,
A lock mechanism including a lever or the like for locking the rotation shaft of the electromagnetic drive source is provided, and the lock by the lock mechanism is released prior to the release operation.

[0004]

In the case where a lock mechanism including the above-described levers is employed in order to cope with a shortage of a holding force or the like, a lever that constitutes the lock mechanism or engages with this lever. A peripheral member or the like is required, and a driving source or the like for performing the locking operation or the unlocking operation is required, so that the original purpose of simplifying the structure cannot be achieved. In addition, since the driving force of the electromagnetic drive source is relatively small, it is possible to prevent the shutter blades from rattling or the like immediately after the lock state is released by the lock mechanism, and to move the shutter blades at a predetermined timing from a predetermined position. It is necessary to ensure that the operation is performed stably.

The present invention has been made in view of the above problems, and has as its object to reduce the cost by simplifying the structure and reducing the number of parts.
It is an object of the present invention to provide a camera shutter device that can surely hold a shutter blade at a predetermined position and can perform a stable traveling operation when driving the shutter blade.

[0006]

SUMMARY OF THE INVENTION A camera shutter device according to the present invention comprises a front blade group and a rear blade group which are provided so as to be able to travel between an open position for opening an exposure opening and a closed position for closing. A front blade electromagnetic drive source that directly applies a driving force when energized to the front blade group and holds a closed position when not energized, and applies a direct drive force when energized to the rear blade group A rear shutter electromagnetic drive source for exerting a holding force for holding the power supply at an open position when energized, and a camera shutter device for performing an exposure operation by running the rear blade group following the movement of the front blade group, When the front blade group is in the closed position and the rear blade group is in the open position, the front blade group is directly engaged with a part of the front blade group and the rear blade group to exert an urging force in the same direction as the holding force, thereby causing the movement. Regulatory electromagnetic drive source to regulate To, it is characterized in that. According to this configuration, when the front blade group is at the closed position, the magnetic force generated by the front blade electromagnetic drive source acts on the front blade group, and is generated by the regulating electromagnetic drive source. An urging force acts. In other words, the biasing force of the regulating electromagnetic drive source is added to the holding force of the leading blade electromagnetic drive source, so that the leading blade group is securely held in the closed position without moving even in response to external shock or vibration. Is done. When the rear blade group is in the open position, a magnetic holding force generated by the rear blade electromagnetic drive source acts on the rear blade group, and an urging force generated by the regulating electromagnetic drive source is applied to the rear blade group. Works. That is, by applying the urging force of the regulating electromagnetic drive source to the holding force of the rear blade electromagnetic drive source, it does not move even with external shock or vibration,
The rear wing group is securely held at the open position.

In the above configuration, the regulating electromagnetic drive source comprises:
Immediately before performing the exposure operation, the front blade group and the rear blade group are directly engaged with the other part of the front blade group and the rear blade group to antagonize the holding force of the front blade electromagnetic drive source and the rear blade electromagnetic drive source. A configuration can be employed that exerts a biasing force on the orientation. According to this configuration, immediately before the front blade group travels, the regulating electromagnetic drive source generates an urging force in a direction opposite to the holding force of the front blade electromagnetic drive source and the rear blade electromagnetic drive source, and the front blade The group and the rear blade group are pressed against a predetermined traveling start position to perform backlash. When the front blade group and the rear blade group start running sequentially in this state, stable running is sequentially performed at a predetermined timing.

In the above structure, the front blade group includes at least one front blade and a front blade supporting member that drivably supports the front blade, and the rear blade group includes at least one rear blade and this rear blade. And a rear-blade support member that drivably supports the first blade. The output portion that outputs the urging force of the regulating electromagnetic drive source is engaged with the first blade support member when the front blade is in the closed position, and is pushed. The first pushed portion is engaged with the output portion that outputs the urging force of the regulating electromagnetic drive source immediately before the leading blade travels from the closed position to the open position. And a third pushed portion to which the output portion for outputting the urging force of the regulating electromagnetic drive source is engaged and pushed when the rear blade is at the open position. Between just before the leading blade travels to the open position and immediately before the trailing blade travels to the closed position. And a fourth the pushing portion of the output unit for outputting the biasing force of the braking electromagnetic drive source is pushed engaged is formed, it is possible to adopt a configuration. According to this configuration, the urging force of the regulating electromagnetic drive source is applied to the leading blade via the first pushed portion or the second pushed portion formed on the leading blade supporting member, and to the trailing blade supporting member. Is transmitted to the rear blade via the third pushed portion or the fourth pushed portion formed on the rear surface.
That is, since the urging force does not directly act on the leading blade and the trailing blade, the leading blade and the trailing blade themselves can be formed in a thin plate shape.

In the above construction, the front blade supporting member is rotatably connected to the front blade and transmits the driving force from the front blade electromagnetic drive source to the front blade driving arm. Consisting of a leading blade support arm that supports
The rear blade supporting member is rotatably connected to the rear blade and transmits a driving force from a rear blade electromagnetic drive source. The rear blade supporting arm rotatably connected to the rear blade and supporting the rear blade. The first blade support arm has the first
A configuration in which a pushed portion and a second pushed portion are formed, and the third pushed portion and the fourth pushed portion are formed in the rear blade supporting arm, may be employed. it can. According to this configuration, the urging force of the regulating electromagnetic drive source is applied to the first pushed portion formed on the front blade supporting arm of the front blade driving arm and the front blade supporting arm constituting the front blade supporting member. Alternatively, a third pushed portion formed on the front blade via the second pushed portion, or on the rear blade support arm of the rear blade drive arm and the rear blade support arm constituting the rear blade support member Alternatively, it is transmitted to the rear blade via the fourth pushed portion. That is, the holding force of the leading blade electromagnetic drive source and the trailing blade electromagnetic drive source acts on the leading blade drive arm and the trailing blade drive arm, and the regulating electromagnetic drive source acts on the leading blade support arm and the trailing blade support arm. Since the urging force acts, the leading blade and the trailing blade are surely moved by the leading blade driving arm and the leading blade supporting arm or the trailing blade driving arm and the trailing blade supporting arm so that the backlash of the connecting portion is also absorbed. Done.

[0010] In the above configuration, the regulating electromagnetic drive source is provided with a spring that applies a biasing force in a direction to position the leading blade group at the closed position and the trailing blade group at the open position.
A configuration can be employed. According to this configuration, the urging force of the spring is added to the holding force of the front blade electromagnetic drive source or the rear blade electromagnetic drive source and the urging force of the regulating electromagnetic drive source, and the front blade group and the rear blade group In the closed position and the open position.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4
1 shows an embodiment of a camera shutter device according to the present invention. FIG. 1 shows a state in which a front blade group is in a closed position in which an opening is closed and a rear blade group is in an open position in which an opening is opened. FIG. 2 is a plan view showing a state in which the front blade group is just before traveling from a closed position in which the opening is closed to an open position, and FIG. 3 is an open position in which the front blade group has opened the opening. FIG. 4 is a plan view showing a state where the rear blade group is in a closed position where the opening is closed, and FIG. 4 is a sectional view showing a part of a camera shutter device. In the drawings, for the sake of convenience of description, a portion that should be a solid line is represented by a dotted line or a portion that should be a dotted line is represented by a solid line.

As shown in FIGS. 1 to 4, a camera shutter device according to this embodiment has an opening 10 for exposure.
a, a base plate 10 defining an opening 20a for exposure, and an intermediate plate 20 disposed in parallel with the base plate 10 at a predetermined interval and defining an opening 20a for exposure. The base plate 1 is movable between a holding plate 30 defining an exposure opening 30a and an open position for opening the openings 10a, 20a, 30a and a closed position for closing the openings.
0 and the intermediate blade 20, and a rear blade group 50 disposed between the intermediate plate 20 and the holding plate 30.
A front blade electromagnetic drive source 60 that directly exerts a driving force when energized on the front blade group 40 and exerts a holding force for holding the closed position when not energized, and a direct drive force when energized on the rear blade group 50 And a front blade group 4 that applies a holding force for holding the blade at the open position when the power is not supplied to the power source.
When the zero and rear blade groups 50 are at the standby position before performing the exposure operation or at the position immediately before the exposure operation, they directly engage with a part of the front blade group 40 and the rear blade group 50 to apply the urging force. The control electromagnetic drive source 80 to be exerted is provided as its basic configuration.

The front blade electromagnetic drive source 60 has a drive pin (output unit) 61a which is magnetized to the N and S poles and outputs a driving force.
, A moving magnet type electromagnetic actuator called an iris motor including an exciting coil 62, a cylindrical yoke 63 forming a magnetic path, and magnetic pins 64 and 65. Then, as shown in FIG. 1, when the leading blade group 40 is in the closed position, the N pole of the rotor 61 is pulled by the magnetic pin 64 in a state in which the coil 62 is not energized, and the rotor 61 rotates clockwise. As shown in FIG. 3, when the leading blade group 40 is in the open position, the S pole of the rotor 61 is pulled by the magnetic pin 65 in a non-energized state so as to exert a rotational urging force (holding force). The rotor 61 exerts a rotational urging force (holding force) in a counterclockwise direction.

The rear blade electromagnetic drive source 70 is, similarly to the preceding blade electromagnetic drive source 60, a rotor 71 provided with a drive pin (output portion) 71a that is magnetized to the N and S poles and outputs a driving force. , An exciting coil 72, a cylindrical yoke 73 forming a magnetic path, and a moving magnet type electromagnetic actuator called an iris motor constituted by magnetic pins 74, 75 and the like. As shown in FIG. 1, when the rear blade group 50 is in the open position, the coil 72
In the non-energized state, the N-pole of the rotor 71 is pulled by the magnetic pin 74 so that the rotor 71 exerts a rotational urging force (holding force) clockwise, and as shown in FIG. When the group 50 is in the closed position, the rotor 71
Is pulled by the magnetic pin 75, and the rotor 71 exerts a rotational urging force (holding force) counterclockwise.

The regulating electromagnetic drive source 80 has a drive pin (an output unit) that is magnetized to the N and S poles and outputs a driving force, similarly to the above-described front blade electromagnetic drive source 60 and rear blade electromagnetic drive source 70. ) 81a and a coil 82 for excitation
A cylindrical yoke 83 forming a magnetic path;
4, 85, etc. As shown in FIG. 1, when the leading blade group 40 is in the closed position and the trailing blade group 50 is in the open position, the N pole of the rotor 81 is pulled by the magnetic pin 84 in a state where the coil 82 is not energized. And the rotor 81
2. When the front blade group 40 is in a state immediately before traveling from the closed position to the open position as shown in FIG.
Is pulled by the magnetic pin 85 so that the rotor 81 exerts a rotational urging force in a counterclockwise direction.

As described above, by using the same structure of the front blade electromagnetic drive source 60, the rear blade electromagnetic drive source 70, and the regulating electromagnetic drive source 80, the components can be shared while using three electromagnetic drive sources. Therefore, the management cost and the component cost can be reduced by reducing the number of components.

As shown in FIGS. 1 and 4, the front blade group 40 includes a plurality of (here, three) front blades 41, 42, 43.
And a front blade drive arm 44 rotatably connected to these front blades 41, 42, 43 and transmitting a driving force from the front blade electromagnetic drive source 60, and the front blade 41 so as to interlock with the front blade drive arm 44. , 42, 43 and a front blade support arm 45 rotatably connected to support the front blades 41, 42, 43. Here, a front blade supporting member is configured by two arms, the front blade driving arm 44 and the front blade supporting arm 45.

The leading blade drive arm 44 and the leading blade support arm 45 are rotatably supported by support shafts 30b and 30c provided on the holding plate 30, as shown in FIGS. The front blade drive arm 44 has an elongated hole 44a with which the drive pin 61a of the front blade electromagnetic drive source 60 engages. The drive pin 6 of the leading blade electromagnetic drive source 60
1a is loosely inserted in a long hole 10b formed in the base plate 10, and the drive pin 61a abuts on both ends of the long hole 10b, so that the rotation range of the leading blade electromagnetic drive source 60 (rotor 61). Is regulated.

As shown in FIG. 1, when the front blade group 40 is in the closed position, the drive pin 81a of the regulating electromagnetic drive source 80 is engaged with the front blade support arm 45 and is pushed. One pushed portion 45a and, as shown in FIG.
Immediately before the vehicle travels from the closed position to the open position, the second drive pin 81a of the regulating electromagnetic drive source 80 is engaged and pushed.
A driven portion 45b is formed. The first pushed portion 45a and the second pushed portion 45b are formed as projecting pieces that project in a flat plate shape from the flat front blade supporting arm 45 in the same plane.

As shown in FIGS. 3 and 4, the rear blade group 50 includes a plurality of (here, three) rear blades 51, 52, and 53.
And a rear blade drive arm 54 rotatably connected to these rear blades 51, 52, 53 and transmitting a driving force from a rear blade electromagnetic drive source 70, and a rear blade interlocked with the rear blade drive arm 54. A rear blade supporting arm 55 rotatably connected to the rear blades 51, 52 and 53 and supporting the rear blades 51, 52 and 53. Here, the rear blade drive arm 54 and the rear blade support arm 55 constitute a rear blade support member.

The rear blade drive arm 54 and the rear blade support arm 55 are rotatably supported by support shafts 30d and 30e provided on the holding plate 30, as shown in FIGS. The rear blade drive arm 54 has an elongated hole 54a with which the drive pin 71a of the rear blade electromagnetic drive source 70 is engaged. The drive pin 7 of the rear blade electromagnetic drive source 70
1a is loosely inserted into a long hole 10c formed in the base plate 10, and the drive pin 71a abuts on both ends of the long hole 10c, thereby rotating the rear blade electromagnetic drive source 70 (rotor 71). Is regulated.

As shown in FIG. 1, when the rear blade group 50 is at the open position, the rear blade supporting arm 55 engages with the drive pin 81a of the regulating electromagnetic drive source 80 to be pushed. (3) From the time immediately before the driven group 55a and the front blade group 40 travel from the closed position to the open position (see FIG. 2) until the time immediately before the rear blade group 50 runs toward the closed position, the regulating electromagnetic drive source. A fourth pushed portion 55b is formed which is engaged with and pushed by the 80 drive pins 81a. The third to-be-pressed portion 55a and the fourth to-be-pressed portion 55b are formed as pins protruding perpendicularly from the rear blade supporting arm 55 having a flat plate shape.

The driving pin 81 of the regulating electromagnetic drive source 80
a is loosely inserted into a long hole 10d formed in the base plate 10, and the drive pin 81a is connected to the first pushed portion 45a and the third
Elongated hole 10d of the main plate 10 which comes into contact with the driven portion 55a at the same time.
By contacting the right end 10d '' of the control electromagnetic drive source 80 (rotor 81), the clockwise and counterclockwise rotation ranges are restricted.

Next, the operation when the camera shutter device according to this embodiment is mounted on a digital still camera as an exposure shutter device will be described with reference to the operation diagrams of FIGS. 5 to 10 and the time chart of FIG. This will be described with reference to FIG. 9 (a) and 9 (b) and FIG.
(A), (b) is the enlarged view which expanded a part of FIG. 5 thru | or FIG. 8, respectively. In the digital still camera according to the present embodiment, even if the front blade group 40 is in the closed position, the photographer can observe the subject image by looking through the optical viewfinder.

First, when the main switch of the camera is turned on and the camera is on standby, as shown in FIG. 5, the front blade group 40 is at the closed position and the rear blade group 50 is at the open position. At this time, the drive pin 61a of the leading blade electromagnetic drive source 60 is connected to one end 10 of the long hole 10b while the coil 62 is not energized.
While being in contact with b ′, further clockwise rotation is regulated, and a clockwise rotational urging force (holding force) is exerted on the front blade drive arm 44 of the front blade group 40. Further, the drive pin 71a of the rear blade electromagnetic drive source 70 contacts the one end 10c 'of the long hole 10c in a state where the coil 72 is not energized, and the further clockwise rotation is regulated. A clockwise rotational urging force (holding force) is exerted on the rear blade drive arm 54 of the group 50.

Further, as shown in FIG. 9 (a), the drive pin 81a of the regulating electromagnetic drive source 80 does not contact the left end 10d 'of the slot 100d when the coil 82 is not energized. The state is maintained, and the first pushed portion 45a and the third
While being in contact with the pushed portion 55a and further restricting clockwise rotation, the front blade support arm 45 and the rear blade support arm 55 are slightly pressed clockwise to exert a rotational urging force. In this state, the leading blade group 40 and the trailing blade group 50 have the magnetic holding force of the leading blade electromagnetic drive source 60 and the trailing blade electromagnetic drive source 70, and also have the magnetic force of the regulating electromagnetic drive source 80. Since a large urging force is applied, the front blade group 40 is securely held at the closed position and the rear blade group 50 is securely held at the open position.

In this standby state, when the photographer performs a release operation, the rotor 81 of the regulating electromagnetic drive source 80 is rotated forward by a predetermined angle (counterclockwise) by energizing the coil 82 as shown in FIG. 6) and FIG.
As shown in (b), the drive pin 81a comes into contact with the second pushing portion 45b of the leading blade support arm 45 and the fourth pushed portion 55b of the trailing blade supporting arm 55 to exert a rotational urging force, thereby causing the leading blade to rotate. The group 40 is moved slightly toward the open position and the rear blade group 50 is moved slightly toward the closed position. In this state, the drive pin 81a is connected to the slot 1 in particular, as shown in FIG.
The non-contact state is maintained with respect to the right end portion 10d '' of 00d. That is, the urging force of the regulating electromagnetic drive source 80 acts in a direction that opposes the holding force of the front blade electromagnetic drive source 60 and the rear blade electromagnetic drive source 70, thereby causing the front blade group 40 and the rear blade group 50 to loosen. Is performed, and the front blade group 40 and the rear blade group 50 are positioned at predetermined exposure start positions.

Subsequently, when the coil 62 is energized as shown in FIG. 11 while the energizing force by the energization of the regulating electromagnetic drive source 80 is applied, the leading blade electromagnetic drive source 60 is activated. The rotor 61 starts normal rotation (counterclockwise rotation). Then, as shown in FIG. 7, at the same time as the leading blade group 40 travels to the open position, the driving pin 61a
The rotation of the coil 62 is stopped by contacting the other end 10b '' of the coil 62b, and the power supply to the coil 62 is cut off. At this time, the holding force of the leading blade electromagnetic drive source 60 (magnetic biasing force due to non-energization) acts in a direction to hold the leading blade group 40 at the open position.

At this time, as shown in FIG. 10A, the second pushed portion 45b of the leading blade support arm 45 is separated from the drive pin 81a of the regulating electromagnetic drive source 80, while the rear blade is moved. The fourth pushed portion 55b of the support arm 55 is still in contact with the drive pin 81a. Thus, the opening 10a is completely opened.

Subsequently, as shown in FIG. 11, while the urging force due to the energization of the regulating electromagnetic drive source 80 is acting and after the activation of the leading blade electromagnetic drive source 60, the coil 72
, The rotor 71 of the rear blade electromagnetic drive source 70 starts to rotate forward (rotate counterclockwise). Then, as shown in FIG. 8, at the same time as the rear blade group 50 travels to the closed position, the drive pin 71a is connected to the other end 10 of the elongated hole 10c.
Further rotation is restricted by contacting the coil c '', and the coil 7
2 is cut off. At this time, the holding force of the rear blade electromagnetic drive source 70 (magnetic biasing force due to non-energization) acts in a direction to hold the rear blade group 50 at the closed position.
The opening 10a is closed again by the travel of the rear blade group 50.

At this time, as shown in FIG. 10B, the fourth pushed portion 55b of the rear blade supporting arm 55 is separated from the drive pin 81a of the regulating electromagnetic drive source 80. At the same time, the rotor 81 rotates slightly counterclockwise, and the drive pin 81a abuts on the right end 10d '' of the elongated hole 10d to restrict further rotation, and the power to the coil 82 is cut off. It is. Here, as shown in FIG. 11, the timing at which the energization of the coil 82 is interrupted is after the energization of the coil 62 and the coil 72 is started and the energization of the coil 62 and the coil 72 is interrupted. Is set before
Thereby, backlash is performed. Incidentally, the rotor 81 may rotate counterclockwise, and the drive pin 81a may contact the second pushed portion 45b and the fourth pushed portion 55b, and at the same time, the power supply to the coil 82 may be cut off. In this case, the backlash is maintained by the magnetic biasing force.

That is, as the rear blade group 50 travels following the travel of the front blade group 40, an exposure operation for the CCD is performed, and one photographing operation is completed. In addition, CC
The electric charge accumulated in D is guided and released by the image signal processing circuit, and is recorded as a photographed image in the recording means based on the output signal of the image signal processing circuit.

On the other hand, when the leading blade group 40 and the trailing blade group 50 are returned to the standby state before traveling, the coil 62 is energized in the reverse direction, as shown in FIG. Reverse energization is performed. Then, the rotor 61 of the leading blade electromagnetic drive source 60 reversely rotates (clockwise rotation).
Then, the leading blade group 40 starts to return from the open position to the closed position. Subsequently, the rotor 71 of the rear blade electromagnetic drive source 70
Rotates backward (clockwise rotation), and the rear blade group 50 starts to return from the closed position to the open position.

Then, as shown in FIG. 5, the leading blade group 40 travels again to reach the closed position, and the drive pin 61a comes into contact with the one end 10b 'of the elongated hole 10b so that further rotation is restricted. When the leading blade group 40 stops, the power supply to the coil 62 is cut off. Further, a little after the start of traveling of the leading blade group 40 to the closed position, as shown in FIG. 5, the trailing blade group 50 travels again to reach the open position, and the drive pin 71a is connected to one end 10c of the elongated hole 10c. When the rotation of the rear blade group 50 is stopped by contacting with the 'and further rotation is stopped, the power supply to the coil 72 is cut off.

As a result, the holding force of the front blade electromagnetic drive source 60 (magnetic biasing force due to non-energization) acts on the front blade group 40 positioned at the closed position, and the front blade group 40 is moved to the closed position. The holding force of the rear blade electromagnetic drive source 70 (magnetic biasing force due to non-energization) acts on the rear blade group 50 held at the open position and holds the rear blade group 50 at the open position. I do.

As shown in FIG. 11, after the power supply to the coil 62 is cut off and before the power supply to the coil 72 is cut off, the power supply to the coil 82 is performed in the opposite direction, and the regulating electromagnetic force is applied. The rotor 81 of the drive source 80 rotates in the reverse direction (clockwise rotation)
Begin to. Then, the drive pin 8 of the regulating electromagnetic drive source 80
1a abuts against the first pushed portion 45a of the leading blade support arm 45 and the third pushed portion 55a of the rear blade supporting arm 55, and slightly moves the leading blade group 40 toward the closed position and the trailing blade group 50. Is slightly pressed toward the open position to exert an urging force in the same direction as the holding force. Then, FIG.
As shown in (1), when the energization of the coil 82 is cut off, the urging force of the regulating electromagnetic drive source 80 continues to act as a magnetic urging force due to non-energization.

Thus, the front blade group 40 is securely held in the closed position by the holding force of the front blade electromagnetic drive source 60 and the urging force of the regulating electromagnetic drive source 80, and the rear blade group 50
Is reliably held at the open position by the holding force of the rear blade electromagnetic drive source 70 and the urging force of the regulating electromagnetic drive source 80, and enters a standby state. In the subsequent photographing, the above-described sequence is repeatedly performed.

In the above-described embodiment, as shown in FIG.
May be provided with a spring 90 that exerts an urging force in a direction to position the rear blade group 50 at the open position. That is, as shown in FIG. 12, a tension type spring 90 is stretched between the projection 10e provided on the main plate 10 and the drive pin 81a. According to this configuration, as shown in FIG. 12A, in a standby state in which the front blade group 40 is in the closed position and the rear blade group 50 is in the open position, the urging force of the spring 90 causes the front blade group 40 to move. Because it is applied as a force for holding the rear blade group 50 in the closed position and the open position,
The front blade group 40 is more securely held by the closed position,
Further, the rear blade group 50 is more securely held by the open position.

On the other hand, immediately before the leading blade group 40 travels,
As shown in FIG. 12B, the biasing force of the spring 90 acts in a direction that opposes the force for rotating the rotor 81 of the regulating electromagnetic drive source 80 in the forward direction.
In addition, it does not affect the running of the rear blade group 50 at all, and the load applied to the regulating electromagnetic drive source 80 is originally small, so that the regulating electromagnetic drive source 80 reliably performs a desired function.

In the above-described embodiment, the first pushed portion 45a and the second pushed portion 4
5b, and the third pushed portion 55a and the fourth pushed portion 55b are formed on the rear blade supporting arm 55. However, the present invention is not limited to this.
2 and 43, a first pushed portion and a second pushed portion are formed, and any of the rear blades 51, 52, 53 has a third pushed portion.
It is also possible to form the pushed part and the fourth pushed part.

That is, in a region near the pivot supported by the leading blade driving arm 44 or the leading blade supporting arm 45, a part of the leading blades 41, 42, 43 is extended, and the first pushed portion is applied to the extended portion. Moving part 45a and second pushed part 4
5b, and the rear blade drive arm 5
4 or a part of the rear blade 51, 52, 53 in the vicinity of being pivotally supported by the rear blade support arm 55, the third pushed portion 55a and the fourth
A shape corresponding to the pushed portion 55b can be formed. Also in this case, the leading blade group 40 and the trailing blade group 5
Since the urging force of the regulating electromagnetic drive source 80 is directly applied to the first blade group 0, the leading blade group 40 and the trailing blade group 50 are reliably held at the closed position and the open position.

In the above embodiment, the front blade drive arm 44 and the front blade support arm 45 are adopted as the front blade support members constituting the front blade group 40.
The configuration in which the rear blade drive arm 54 and the rear blade support arm 55 are adopted as the rear blade support members constituting the rear blade group 50 has been described. However, the configuration is not limited to this.
Each of the front blade support member and the rear blade support member is 1
A first blade arm and a second blade arm are adopted, and a first pushed portion and a second pushed portion are provided for the first blade arm,
Further, it is also possible to adopt a configuration in which the third pushed portion and the fourth pushed portion are provided for the rear blade arm.

In the above embodiment, the front blade group 40 and the rear blade group 50 are each composed of a plurality of blades. However, it is not always necessary to adopt such a configuration.
Each of them may be constituted by one blade. Further, in the above embodiment, the first pushed portion 45a and the second pushed portion 45b are provided on the leading blade support arm 45,
Although the pushed portion 55a and the fourth pushed portion 55b are configured to be provided on the rear blade supporting arm 55, the present invention is not limited to this, and the first pushed portion 4 is attached to the leading blade drive arm 44.
One of the first and second pushed portions 45a and 45b is provided on the leading blade support arm 45, and the other of the first and second pushed portions 45b is provided on the front blade supporting arm 45. Moving part 5
One of 5a and the fourth pushed portion 55b may be configured so that the rear blade support arm 55 is provided with the other of the third pushed portion 55a and the fourth pushed portion 55b.

[0044]

As described above, according to the camera shutter device of the present invention, the front blade electromagnetic drive source exerting the driving force and the holding force on the front blade group, and the driving force and the holding force on the rear blade group. In addition to the rear blade electromagnetic drive source, a regulating electromagnetic drive source that applies urging force to both the front blade group and the rear blade group has been provided, which simplifies the structure and reduces costs by reducing the number of parts. In addition, the front blade group and the rear blade group can be reliably held in a standby state before traveling without moving even in response to an external shock or vibration. Also, by performing backlash by the urging force of the regulating electromagnetic drive source, the front blade group and the rear blade group can be positioned at the exposure start position, and a stable exposure operation can be performed.
In addition, since the leading blade group and the trailing blade group are positioned by being biased by one regulating electromagnetic drive source, the structure is simplified as compared with the case where separate regulating electromagnetic drive sources are separately provided. In addition, downsizing, cost reduction, and the like can be performed by reducing the number of parts. Furthermore, by using the same configuration for the front blade electromagnetic drive source, the rear blade electromagnetic drive source, and the regulating electromagnetic drive source, parts can be shared, and the management cost can be reduced or the cost of the device can be reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a camera shutter device according to the present invention, in which a front blade group is in a closed position and a rear blade group is in an open position.

FIG. 2 is a plan view illustrating an embodiment of a camera shutter device according to the present invention, in which a front blade group is in a state immediately before traveling.

FIG. 3 is a plan view illustrating an embodiment of a camera shutter device according to the present invention, showing a state after a shutter operation in which a front blade group is at an open position and a rear blade group is at a closed position.

FIG. 4 is an enlarged sectional view of a part of the camera shutter device shown in FIG. 1;

FIG. 5 is an enlarged plan view showing a part of the camera shutter device in an enlarged manner for explaining the operation of the camera shutter device, showing a state before traveling in which a front blade group is at a closed position and a rear blade group is at an open position.

FIG. 6 is an enlarged plan view showing a part of the enlarged view for explaining the operation of the camera shutter device, and shows a state immediately before the front blade group travels toward an open position.

FIG. 7 is an enlarged plan view showing a part of the camera shutter device in an enlarged manner for explaining the operation of the camera shutter device, and shows a state in which a front blade group has traveled toward an open position.

FIG. 8 is an enlarged plan view showing a part of the camera shutter device in an enlarged manner for explaining the operation of the camera shutter device, showing a state where a front blade group is at an open position and a rear blade group is at a closed position.

FIG. 9 is a partially enlarged view showing an engagement relationship between a regulating electromagnetic drive source and a first pushed portion and a second pushed portion or a third pushed portion and a fourth pushed portion, (A) shows the state of the leading blade group and the trailing blade group before traveling, and (b) shows the state of the leading blade group immediately before traveling.

FIG. 10 is a partially enlarged view showing an engagement relationship between a regulating electromagnetic drive source and a first pushed portion and a second pushed portion or a third pushed portion and a fourth pushed portion. (A) shows the state after the front blade group has run, and (b) shows the state after the rear blade group has run.

FIG. 11 is a time chart for explaining the operation of the camera shutter device.

FIGS. 12A and 12B show another embodiment of the camera shutter device according to the present invention, wherein FIG. 12A is a plan view showing a state before a front blade group and a rear blade group travel, and FIG. 12B is a front blade group. Is a plan view showing a state immediately before traveling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main plate 20 Intermediate plate 30 Holding plate 40 Front blade group 44 Front blade drive arm (first blade support member) 45 Front blade support arm (first blade support member) 45a First pressed part (part) 45b Second pressed Moving part (part of others) 50 Rear blade group 54 Rear blade drive arm (rear blade support member) 55 Rear blade support arm (rear blade support member) 55a Third pushed driven part (part) 55b Fourth pressed Moving part (part of others) 60 Front blade electromagnetic drive source 70 Rear blade electromagnetic drive source 80 Regulatory electromagnetic drive source 90 Spring

Claims (5)

[Claims] 1. A front blade group and a rear blade group provided so as to be able to travel between an open position for opening an exposure opening and a closed position for closing, and are directly driven when electricity is supplied to the front blade group. A front blade electromagnetic drive source for exerting a force and holding the holding position in the closed position when not energized, and a holding force for directly applying a driving force to the rear blade group when energized and maintaining the open position when not energized. A shutter device for a camera, comprising: a rear-blade electromagnetic drive source for performing the exposure operation by running the rear-blade group following the running of the front-blade group, wherein the front-blade group is in the closed position. And when the rear wing group is in the open position, it directly engages with a part of the front wing group and the rear wing group, exerts an urging force in the same direction as the holding force, and regulates the movement thereof. It has an electromagnetic drive source. Camera shutter apparatus according to claim. 2. The regulating electromagnetic drive source directly engages with the other part of the front blade group and the rear blade group immediately before performing the shutter operation, and 2. The camera shutter device according to claim 1, wherein a biasing force is exerted in a direction opposite to a holding force of the front blade electromagnetic drive source and the rear blade electromagnetic drive source. 3. The front blade group includes at least one front blade and a front blade support member that drivably supports the front blade. The rear blade group includes at least one rear blade. A rear blade supporting member for drivingly supporting the rear blade. The front blade supporting member outputs an urging force of the regulating electromagnetic drive source when the front blade is at the closed position. A first pushed portion to which the output portion is engaged and pushed, and an output portion that outputs the urging force of the regulating electromagnetic drive source immediately before the leading blade travels from the closed position to the open position. And a second pushed portion that is pushed together, and the rear blade supporting member has an output that outputs an urging force of the regulating electromagnetic drive source when the rear blade is at the open position. A third pushed portion to which the portion is engaged and pushed, and the leading blade travels to the open position. And a fourth pushed portion to which the output portion for outputting the urging force of the regulating electromagnetic drive source is engaged and pushed from immediately before the rear blade travels to the closed position is formed. 2. The method according to claim 1, wherein
Or the shutter device for a camera according to 2. 4. The front blade supporting member is rotatably connected to the front blade and transmits a driving force from the front blade electromagnetic drive source, and is rotatably connected to the front blade. A front blade supporting arm that supports the front blade, and the rear blade supporting member is rotatably connected to the rear blade and transmits a driving force from the rear blade electromagnetic driving source. A rear blade support arm rotatably connected to the rear blade and supporting the rear blade. The first blade support arm includes a first pushed portion and a second pushed portion. 4. The camera shutter device according to claim 3, wherein the third pushed portion and the fourth pushed portion are formed on the rear blade supporting arm. 5. 5. The regulating electromagnetic drive source is provided with a spring that exerts an urging force in a direction for positioning the front blade group at the closed position and the rear blade group at the open position. 5. The camera shutter device according to claim 1, wherein: