JP2002156684A - Shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To close a sector by spring force while miniaturizing an electromagnetic driving source in a shutter device where the sector is opened by spring force. SOLUTION: This device is equipped with an opening-side driving spring 50 with which the sector 30 is opened, a driving lever 40, the electromagnetic driving source 60 holding the blade 30 at a position where the aperture part 10a is closed, and a closing-side driving spring 70 with which the sector 30 is closed. By energizing the driving source 60 so that a rotor 61 is rotated, the closing state of the sector 30 is released and the sector 30 is opened by the spring force of the spring 50. From the midway of the opening operation, the spring 70 is charged by an output part 61a and the sector 30 is closed by the spring force of the charged spring 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device provided with a shutter blade for opening and closing an exposure opening and mounted on a camera or the like, and more particularly to a shutter device for opening a shutter blade by a spring force.

[0002]

2. Description of the Related Art A shutter device mounted on a silver halide film type camera or the like is a so-called normally closed type in which a shutter blade is normally kept closed by exposing a shutter blade to an opening for exposure. At the time of photographing, an exposure operation is performed by opening and subsequently closing an opening for exposure by shutter blades. In this type of shutter device, when opening and closing the shutter blades during an exposure operation, an opening operation is performed by a biasing force of a spring, and a closing operation is performed by a driving force of a motor or the like. .

[0003]

By the way, when the opening / closing operation is performed by the urging force of the spring and the driving force of the motor or the like as described above, particularly in the closing operation, the urging force of the spring is charged. That is, it is necessary to cause the shutter blades to perform the closing operation while resisting the maximum spring force in the closed state. Therefore, in order to run the shutter blade at a closing speed equal to or higher than a predetermined level, it is necessary to increase the driving force generated by the motor and the like, and as a result, the size of the motor and the like is increased. On the other hand, when the size of the motor or the like is reduced, the driving force decreases, and as a result, the closing speed decreases,
A desired exposure operation cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to reduce the size of a driving source such as a motor while allowing a shutter blade to perform a desired exposure operation. It is an object of the present invention to provide a shutter device which can be used.

[0005]

According to the present invention, there is provided a shutter device comprising: a shutter blade for opening and closing an exposure opening; an opening-side drive spring for exerting a driving force for causing the shutter blade to perform an opening operation; Holding means for applying a holding urging force capable of holding the shutter blade at a position where the opening is closed against the urging force of the driving spring; and closing-side driving means for applying a driving force for causing the shutter blade to perform a closing operation. With
A shutter device that causes a shutter blade to perform an opening operation by an opening-side driving spring and a closing operation by a closing-side driving unit by releasing the holding by the holding unit, wherein the closing-side driving unit includes a shutter blade. And a closing-side driving spring that has a maximum spring force at a position where the opening is opened when the spring force is charged at the time of the opening operation. According to this configuration, when the holding state of the shutter blade by the holding means is released, the shutter blade performs the opening operation by the urging force (spring force) of the opening-side drive spring to open the opening. Further, by the biasing force (spring force) of the closing drive spring charged during the opening operation of the shutter blade, and by the holding biasing force of the holding means,
While the shutter blade performs the closing operation, the opening side drive spring is charged again. Then, the shutter blade is held at a position where the opening is closed by the holding urging force of the holding means. The exposure operation by the shutter blades is performed by the above series of operations.

In the above construction, one end is connected to the shutter blade and has a swingable drive lever for transmitting a driving force, and the holding means engages with the other end of the drive lever by moving in one direction. The shutter blade is held at the position where the opening is closed by restricting the movement of the drive lever, and the restriction of the drive lever is released by the movement in the other direction, and the spring is engaged with the closing side drive spring. A configuration that is an electromagnetic drive source including a mover that performs force charging can be employed. According to this configuration, the shutter blade is held at a position where the opening is closed in a state where the mover moves in one direction and engages with the other end of the drive lever. When the mover moves in the other direction, the regulation of the drive lever is released, the shutter blade starts to open by the urging force of the open side drive spring, and the closing side drive spring is charged.

In the above structure, the mover is a rotor that can rotate within a predetermined angle range and has a driving force output portion at a position deviated from the center of rotation.
In the rotation direction, a configuration can be adopted that is disposed between the other end of the drive lever and one end of the closing drive spring. According to this configuration, when the rotor rotates in one direction, the output portion engages with the other end of the drive lever, and exerts a holding biasing force against the biasing force of the opening-side drive spring, thereby causing the drive lever to rotate. When the movement is restricted and the rotor rotates in the other direction, the output portion releases the restriction on the drive lever, and the shutter blade starts opening operation by the urging force of the opening side drive spring. Also. The output portion of the rotor engages with one end of the closing drive spring to start charging the spring force. That is, only by switching the rotation direction of the rotor, the regulation and release of the drive lever and the charging of the closing drive spring can be performed.

In the above configuration, the electromagnetic driving source holds the shutter blade at a position where the opening is closed by restricting the movement of the driving lever by a magnetic biasing force in a non-energized state, and restricts the driving lever by energizing. A configuration in which the spring force is released and the spring force of the closing drive spring is charged can be adopted. According to this configuration, the movable element (the output section of the rotor) restricts the drive lever and closes the shutter blade by the magnetic biasing force when power is not supplied, against the biasing force of the opening-side drive spring. On the other hand, when energized, the mover (output portion of the rotor) releases the restriction on the drive lever, causes the shutter blade to perform the opening operation, and starts charging the closing-side drive spring.

In the above configuration, the electromagnetic drive source may be configured such that when the shutter blades perform the closing operation, the power is supplied in the opposite direction to exert a driving force on the other end of the drive lever. . According to this configuration, in addition to the urging force (spring force) of the closing drive spring and the holding urging force (magnetic urging force) of the holding unit (electromagnetic driving source), the electromagnetic driving force of the electromagnetic driving source acts. Thus, the shutter blade quickly moves to the closed position.

[0010] In the above configuration, it is possible to adopt a configuration in which the closing-side drive spring is charged with a spring force during the opening operation of the shutter blade. According to this configuration, when the electromagnetic drive source starts to start from an initial state in which the shutter blade closes the opening, the spring force of the closing drive spring is not applied to the electromagnetic drive source as a load, so that the opening operation of the shutter blade is performed. Starts well.

In the above construction, the closing drive spring is held at a state where a predetermined spring force has been charged in advance, and has one end portion with respect to the stopper so that the spring force is further charged by engagement of the mover. , Which can be detachably hooked. According to this configuration, the timing at which the spring force of the closing drive spring is applied to the electromagnetic drive source as a load can be delayed as compared with the case where one end of the closing drive spring is freely opened. The spring force charged to the drive spring can be set large.

In the above configuration, it is possible to adopt a configuration in which the open-side drive spring and the close-side drive spring are formed of torsion springs arranged coaxially with the support shaft of the drive lever.
According to this configuration, the drive lever, the open-side drive spring, and the close-side drive spring are integrated at one location, which contributes to downsizing of the device.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 8
1 shows an embodiment of a shutter device according to the present invention. In FIGS. 5 to 8, for convenience of description, a portion to be indicated by a dotted line is indicated by a solid line. As shown in FIGS. 1 to 3, the shutter device according to this embodiment has a base plate 1 having openings 10a and 20a for exposure.
A shutter blade 30 rotatably mounted on the base plate 10 for opening and closing the openings 10a, 20a for exposure; a driving lever 40 for transmitting a driving force to the shutter blade 30; Opening drive spring 50 for applying a biasing force to the drive lever 40 so as to perform the opening operation, and the opening 1 against the biasing force of the opening side drive spring 50.
An electromagnetic drive source 60 as a holding means capable of holding the shutter blade 30 at a position where the shutter blades 0a and 20a are closed, and a closing drive spring as a closing drive means for exerting a driving force for causing the shutter blade 30 to perform a closing operation. 70 and the like are provided as its basic configuration.

As shown in FIGS. 2 and 3, the shutter blades 30 close the opening 10a by approaching and overlapping each other, and close the opening 1a by moving away from each other.
The shutter blades 31 and 32 have long holes 31a and 32a, and support shafts 10b and 10c protruding from the back surface of the base plate 10.
Are rotatably supported.

As shown in FIGS. 1 to 3, the drive lever 40 is swingably supported by a support shaft 10d protruding from the upper surface of the base plate 10. One end 41 of the drive lever 40 has the length of the shutter blade 30. It has a drive pin 41a connected to the holes 31a and 32a, and the other end 42 has an electromagnetic drive source 60.
Can be engaged with the output portion 61a of the rotor 61, which forms a part of. A hooking projection 43 is formed on the upper surface of the arm forming the one end 41.

The opening-side drive spring 50 is formed of a torsion spring, and has a coil portion 51, one end portion 52, and another end portion 53, as shown in FIGS. The coil portion 51 is arranged coaxially with the support shaft 10 d of the drive lever 40, one end portion 52 is hooked on the hooking projection 43 of the drive lever 40, and the other end portion 53 is projected from the base plate 10.
e.

As a result, the opening side drive spring 50 is
In FIG. 3 and FIG. 3, the urging force (spring force) is adjusted so that the drive lever 40 is rotated counterclockwise, that is, the shutter blade 30 is rotated toward the opening side (the position where the opening 10a is fully opened). Has been exerted. Therefore,
The spring force of the opening side drive spring 50 is in the state of the maximum spring force charged to the maximum when the shutter blade 30 is at the position where the opening 10a is closed.
As shown in the figure, when the opening 10a is at the fully opened position, it is in the state of the initial set spring force.

The closing drive spring 70 is formed of a torsion spring, and has a coil portion 71, one end portion 72, and another end portion 73, as shown in FIGS. Then, the coil portion 71 is disposed coaxially with the support shaft 10d of the drive lever 40, and one end portion 72 has a stopper 10f projecting from the main plate 10.
, And the other end 73 is hooked on a hook projection 10 g protruding from the main plate 10. Here, the one end 72 is hung so as to be detachable counterclockwise in FIGS. 1 and 3 with respect to the stopper 10f. That is, one end 72
Is held by the stopper 10f in a state where a predetermined spring force is charged in advance (has an initial set spring force). From this state, the output portion 61a of the electromagnetic drive source 60 is connected to the one end portion 7f.
The spring force of the closing drive spring 70 is further charged by engaging and further deforming the second drive spring 70.

Therefore, the rotor 61 of the electromagnetic drive source 60
Is rotated, the output portion 61a deforms the one end portion 72, and at the position where the rotor 61 is rotated by the maximum angle, the closing side drive spring 7
Zero is charged with the maximum spring force. Further, the closing drive spring 70 and the opening drive spring 50 are coaxially arranged with the support shaft 10d of the drive lever 40 and are arranged in two upper and lower stages, and the components near the drive lever 40 are integrated. . Thereby, the device can be downsized.

As shown in FIGS. 1 and 2, the electromagnetic drive source 60 includes a rotor 61 as a mover rotatably supported in a predetermined angle range, and an upper yoke 6 forming a magnetic circuit.
2 and a lower yoke 63, an exciting coil 64 and the like. The rotor 61 has an output portion 61a that is magnetized to two poles and outputs a driving force to a position deviated by a predetermined distance from the center of rotation. Then, the output unit 61a
As shown in FIG. 1, the other end 42 of the drive lever 40 and the closing drive spring 70 in the rotation direction of the rotor 61.
It is arranged so as to be sandwiched between the one end 72 of the
When the rotor 61 rotates counterclockwise, it exerts a pressing force (rotational urging force) on the other end 42. On the other hand, when the rotor 61 rotates clockwise, it engages with the one end 72 to generate a pressing force (rotational urging force). Is to exert.

The upper yoke 62 has a wide arc-shaped first magnetic pole portion 62a and a second magnetic pole portion 62b as shown in FIG. 1, and the lower yoke 63 has a wide arc shape as shown in FIGS. Further, it has a narrow arc-shaped first magnetic pole portion 63a, a wide arc-shaped second magnetic pole portion 63b, and a third magnetic pole portion 63c extending in the rotation axis direction of the rotor 61. When the coil 64 is not energized, the rotor 61 rotates counterclockwise in FIG. 1 due to an attractive force generated between the third magnetic pole portion 63c and the output portion 61a (arm portion). Magnetically biased. On the other hand, by energizing the coil 64, the rotor 61 rotates clockwise in FIG. 1, and when the energizing of the coil 64 is stopped from a state where the rotor 61 is rotated to the maximum angle, the rotor 61 rotates counterclockwise by the magnetic urging force. Alternatively, when the coil 64 is energized in the reverse direction, the coil 64 rotates counterclockwise more quickly by the action of the generated electromagnetic force and magnetic biasing force, and stops at a predetermined position. ing.

Here, the electromagnetic drive source 60 and the drive lever 4
0, the opening side driving spring 50 and the closing side driving spring 70 will be described.
As shown in (a), the rotor 61 is rotated counterclockwise (one direction) by the magnetic biasing force, and
The drive lever 40 is held at a position rotated clockwise by a predetermined angle while resisting the urging force (spring force). That is, the output portion 61a of the rotor 61 functions as a holding unit that restricts the movement of the drive lever and releases the restriction.

The closing drive spring 70 is in a state where one end 72 thereof is in contact with the stopper 10f and charged to a predetermined spring force (initial set spring force). At this time, the shutter blade 30 is held in a state where the opening 10a is completely closed via the rotor 61 (output portion 61a) and the drive lever 40. Here, the closing-side drive spring 70 has its one end 72 hooked to the stopper 10f in a state where the spring force is charged in advance, so that a larger spring force can be obtained with a small amount of deformation from the hooked position. Can be charged.

When the coil 64 is energized in a predetermined direction, the rotor 61 instantaneously starts rotating clockwise as shown in FIG. 4B, and the one end 72 of the closing drive spring 70 is rotated. Abuts (engages with). The timing of the contact (engagement) is determined at the time when the rotor 61 rotates clockwise by about 1/3 from the rest position in the angular range in which the rotor 61 operates (rotates), that is, the opening operation of the shutter blade 30. Is set in the middle of Then, by the clockwise rotation of the rotor 61, the state in which the output portion 61 a presses and holds the other end portion 42 is released, and the drive lever 40 is caused to rotate by the urging force of the opening side drive spring 50. Start to rotate counterclockwise to follow with a delay. At this time, the shutter blade 30 starts to open in a direction to open the opening 10a.

When the rotor 61 further rotates clockwise by energizing the coil 64, as shown in FIG. 4C, the output portion 61a of the rotor 61
Is pushed counterclockwise to charge the closing-side drive spring 70 with the spring force, and stops when rotated by a predetermined angle. At this stop position, the closing drive spring 70 is in a state where the maximum spring force is charged. That is, the rotor 61 functions as a mechanism for charging the spring force of the closing drive spring 70. In addition, the clockwise rotation of the rotor 61 causes the drive lever 40 to further follow and rotate counterclockwise, and the shutter blade 30 reaches a state where the opening 10a is completely opened. Due to the rotational operation of the drive lever 40, the spring force charged to the opening-side drive spring 50 becomes a minimum state. That is, the spring force of the closing drive spring 70 is much greater than the spring force of the opening drive spring 50 acting in the opposite direction.

On the other hand, when the energization is cut off from the state shown in FIG. 4C, the output portion 61a of the rotor 61 outputs the fully charged closing drive spring 70 as shown in FIG. 4D.
The rotor 61 starts to rotate counterclockwise by being pushed by the spring force of the above, and is attracted by the magnetic urging force (magnetic attraction force).
The drive lever 40 rotates and stops at the rest position shown in FIG. 4A against the spring force of the opening-side drive spring 50 that increases with the movement. Thereby, the shutter blade 30
Changes from a state where the opening 10a is opened to a state where the opening 10a is closed. Then, the rotor 61 again restricts the movement of the drive lever 40 and holds the shutter blade 30 at the closed position.

Next, the operation when the shutter device is mounted on a silver halide camera will be described with reference to the operation diagrams of FIGS. 5 to 8 and the time chart of FIG.
The camera is provided with a release switch serving as a trigger at the time of photographing, a control unit (CPU) for performing various controls such as energizing the electromagnetic drive source 60, and the like. First, in a photographing standby state (pause state), as shown in FIG.
Numeral 1 rotates counterclockwise due to the magnetic biasing force, and holds the drive lever 40 at a position rotated clockwise to restrict the movement. At this time, the shutter blade 30
The opening 10a is completely closed. The opening side drive spring 50 is in a state where the spring force is charged to the maximum as shown in FIG.

In this state, when the release operation is performed, as shown in FIG. 9, the electromagnetic drive source 60 is energized in a predetermined direction by the control signal output from the control unit, and the rotor 61 rotates clockwise. Start to rotate. When the rotor 61 is started, the one end 72 of the closing drive spring 70 does not act as a load, so that the rotor 61 rotates quickly.

The holding state (restricted state) of the driving lever 40 is released by the rotation of the rotor 61, and the driving lever 40 starts rotating counterclockwise by the urging force of the opening side driving spring 50, and the shutter blades 30 starts an opening operation for opening the opening 10a. As described above, since the rotor 61 rapidly rotates at such a speed that the output portion 61a is separated from the other end portion 42, the rotation operation of the drive lever 40 by the spring force of the opening side drive spring 50, that is, the shutter blade 30 Is performed at a desired timing and speed without any influence.

When power is further supplied and the rotor 61 is rotated by about 1/3 of the operating range, its output portion 61a contacts the one end 72 of the closing drive spring 70 as shown in FIG. At this time (during the opening operation of the shutter blade 30), charging of the closing-side drive spring 70 with the spring force is started, as shown in FIG.

Then, when the rotor 61 further rotates clockwise, as shown in FIG. 7, when the shutter blade 30 reaches the position where the opening 10a is opened, the rotor 61 stops and the drive lever 40 also stops. . At this time, the spring force of the open-side drive spring 50 is minimized, and the spring force charged to the close-side drive spring 70 is maximized.
Is much larger than the spring force of the opening side drive spring 50.

After a predetermined time has elapsed in this fully opened state, when the power to the electromagnetic drive source 60 is cut off by a control signal output from the control unit, as shown in FIG. 61a is pushed by the spring force of the closed-side drive spring 70 charged to the maximum, and is attracted by the magnetic urging force (magnetic attraction force), and starts rotating counterclockwise. At the same time, when the output portion 61a pushes the other end portion 42, the drive lever 40 starts rotating clockwise against the spring force of the opening-side drive spring 50, and the shutter blade 30 is opened. A closing operation for closing the portion 10a is started.

Then, when the rotor 61 rotates counterclockwise by about 2/3 of an angle, as shown in FIG. 8, one end 72 of the closing drive spring 70 is hooked on the stopper 10f, and the output portion 61a is It begins to detach from one end 72. From this point, the spring force of the closing drive spring 70 stops acting, and the rotor 61 rotates only by the magnetic biasing force (magnetic attraction force) against the spring force of the opening drive spring 50, and FIG.
Stop when it reaches the standby position shown in. As a result, the shutter blade 30 changes from the state in which the opening 10a is opened to the state in which it is closed, and the rotor 61 again restricts the movement of the drive lever 40 and holds the shutter blade 30 in the closed position. By the above series of operations, the exposure operation is completed, and one photographing operation is completed.

By the way, in the closing operation from the fully open state shown in FIG. 7, the energization is not interrupted by the control signal output from the control unit, but as shown by the two-dot chain line in FIG. When a current is supplied in the opposite direction to the rotor 61, a rotational driving force due to electromagnetic force acts on the rotor 61 in addition to the spring force and the magnetic biasing force (magnetic attraction force) of the fully charged closing drive spring 70. As a result, the rotor 61 starts to rotate counterclockwise more quickly. Thereby, the shutter blade 30 performs the closing operation more quickly,
High-speed shooting can be performed.

In the above-described embodiment, the electromagnetic drive source 60 as the holding means has a rotor 61 of a rotary type.
However, the present invention is not limited to this. For example, a linear type in which the mover reciprocates linearly may be employed. In the above embodiment, the swingable drive lever 40 is employed as a mechanism for driving the shutter blade 30.
Instead of using 0, it is also possible to adopt a form of directly driving by the electromagnetic drive source 60. Further, in the above-described embodiment, torsion springs are employed as the open-side drive spring 50 and the close-side drive spring 70, but the present invention is not limited to this, and other springs such as a tension spring or a compression spring may be used. Can also be adopted.

Further, in the above embodiment, the point in time when charging of the closing drive spring 70 is started is determined by the rotor 6.
1 is about 1/3 on the open side (clockwise) of the operating range
Is adopted, but is not limited to this value. According to the design specifications of the rotor 61, the drive lever 40, the open-side drive spring 50, the close-side drive spring 70, and the like,
It is appropriately selected. That is, the electromagnetic drive source 60
Is in the non-energized state, the rotor 61 returns to the standby position by only the closing drive spring 70 and the magnetic biasing force, overcoming the spring force of the opening drive spring 50, and the shutter blade 3
It is appropriately selected according to the specifications of the apparatus so that 0 can be kept in the closed state.

Further, in the above-described embodiment, the electromagnetic drive source 60 as the holding means has not only a holding function of holding the shutter blade 30 in a closed state, but also a charging function of charging the closing drive spring 70. Although the configuration has been described, the present invention is not limited to this, and a mechanism having a holding function and a charging function separately may be adopted for each.

[0038]

As described above, according to the shutter device of the present invention, the opening-side driving spring for causing the shutter blade to perform the opening operation, and the shutter in the closed position against the urging force of the opening-side driving spring. Holding means capable of holding the blades; and closing-side driving means for causing the shutter blades to perform a closing operation. As the closing-side driving means, a spring force is charged when the shutter blades are opened, and the opening is opened. By using the close-side drive spring that has the maximum spring force at the set position, the spring force charged to the close-side drive spring can be used without using the drive force of an electromagnetic drive source or the like during the closing operation. Thus, the closing operation can be performed by reliably operating the shutter blades. This eliminates the need for a large electromagnetic drive source or the like, and can reduce the size and cost of the device.

As a mechanism for driving the shutter blade, an oscillating drive lever is interposed, and an electromagnetic drive source is used as the holding means. In particular, a type including a rotor having an output portion is used as the electromagnetic drive source. By arranging this output portion between the drive lever and the closing drive spring, it is possible to regulate and release the drive lever and to charge the closing drive spring only by switching the rotation direction of the rotor.

Further, the structure is such that the spring force of the closing drive spring is charged during the opening operation of the shutter blade, so that when the electromagnetic drive source (rotor) starts to operate, the spring of the closing drive spring is started. Since no force is applied to the electromagnetic drive source as a load, the opening operation of the shutter blades can be favorably performed at a desired timing.

Further, when the shutter blades are closed,
When the electromagnetic drive source is energized in the opposite direction, the electromagnetic drive force of the electromagnetic drive source can be reduced in addition to the spring force of the closing drive spring and the holding biasing force (magnetic biasing force) of the holding means (electromagnetic drive source). Accordingly, the closing operation of the shutter blade can be performed at a high speed. Further, by adopting torsion springs as the open side drive spring and the close side drive spring and arranging them coaxially with the support shaft of the drive lever, the size of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a shutter device according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a shutter device according to the present invention.

FIG. 3 is a partially enlarged view showing a driving mechanism of a shutter blade.

4A and 4B are operation diagrams showing a relationship among a rotor, a driving lever, an opening-side driving spring, and a closing-side driving spring. FIG. 4A is a standby (pause) state, and FIG. (C) a state in which the spring force of the closing drive spring is charged to the maximum, and (d) a point in time when the rotor rotates in the reverse direction to release the charging of the closing drive spring. FIG.

FIG. 5 is a plan view showing a standby state in which shutter blades close an opening.

FIG. 6 is a plan view showing a state where the rotor rotates to start charging the closing drive spring.

FIG. 7 is a plan view showing a state in which a rotor is rotated by a maximum angle, a closing-side drive spring is charged to a maximum, and shutter blades open an opening;

FIG. 8 is a plan view showing a state at the time when the shutter blade performs the closing operation and the charge of the closing drive spring is released.

FIG. 9 is a time chart illustrating a control operation of the shutter device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ground plate 20 Holding plate 10a, 20a Opening for exposure 10d Support shaft 10f Stopper 10e, 10g Hook projection 30 (31, 32) Shutter blade 31a, 32a Long hole 40 Drive lever 41a Drive pin 42 Other end 43 Hook Projection 50 Open-side drive spring 60 Electromagnetic drive source (holding unit) 61 Rotor (movable element) 61a Output unit 62 Upper yoke 63 Lower yoke 64 Coil 70 Close-side drive spring (close-side drive unit) 72 One end

Claims (8)

[Claims] A shutter blade for opening and closing an opening for exposure, an opening-side drive spring for exerting a driving force for causing the shutter blade to perform an opening operation, and a biasing force of the opening-side drive spring. Holding means for applying a holding urging force capable of holding the shutter blade at a position where the opening is closed, and closing-side driving means for applying a driving force for causing the shutter blade to perform a closing operation; A shutter device that causes the shutter blade to perform an opening operation by the opening-side driving spring and a closing operation by the closing-side driving unit by releasing the holding by the closing-side driving unit. A closing-side driving spring that is charged with a spring force during an opening operation of the shutter blade and has a maximum spring force at a position where the opening is opened. Shutter device for. 2. An end portion is connected to the shutter blade, and a swingable drive lever for transmitting a driving force is provided. The holding means engages with the other end of the drive lever by moving in one direction. In addition, the shutter blade is held at a position where the opening is closed by restricting the movement of the drive lever, and the restriction of the drive lever is released by moving in the other direction, and the closing-side drive spring is moved. The shutter device according to claim 1, wherein the shutter device is an electromagnetic drive source including a mover that engages with the first member to charge a spring force. 3. The rotor according to claim 1, wherein the movable element is a rotor having a driving force output portion at a position deviating from a center of rotation while being rotatable within a predetermined angle range. 3. The shutter device according to claim 2, wherein the shutter device is disposed between the other end of the drive lever and one end of the closing drive spring. 4. The electromagnetic drive source, in a non-energized state, holds the shutter blade at a position where the movement of the drive lever is restricted by a magnetic urging force to close the opening, and the drive lever is energized by energization. 4. The shutter device according to claim 2, wherein the restriction is released and the spring force of the closing drive spring is charged. 5. The electromagnetic drive source according to claim 1, wherein when the shutter blade performs a closing operation, a current is supplied in a reverse direction to apply a driving force to the other end of the drive lever. Item 5. The shutter device according to Item 4. 6. The shutter device according to claim 2, wherein the closing drive spring is charged with a spring force during the opening operation of the shutter blade. 7. One end of the closing-side drive spring is provided with respect to a stopper so that a predetermined spring force is held in advance and the spring force is further charged by engagement of the movable element. 7. The shutter device according to claim 6, wherein the shutter device is detachably hooked. 8. The drive mechanism according to claim 2, wherein the open drive spring and the close drive spring are torsion springs arranged coaxially with a support shaft of the drive lever.
A shutter device according to any one of the above.