JP2021128312A - Blade driving device and imaging device having the same - Google Patents

Abstract

To provide a small blade driving device capable of rapid imaging.SOLUTION: A blade driving device 1 has a front blade driving lever 51 for opening or closing front blades 21 to 24. The front blade driving lever 51 includes: a first lever member 61 having a front blade driving unit 613 connected to front blade arms 31 and 32, the first lever member being rotatable between a front blade expansion position and a front blade escape position around a front blade driving shaft 19; a second lever member 62, rotatable between a front blade charge position and a front blade release position around the front blade driving shaft 19; a lock member 80 rotatable around a shaft unit 81; and a composite cam member 70 rotatable around a composite cam shaft 13, the composite cam member 70 having an unlock cam 76 pressing the lock member 80 and unlocking the lock state of the lock member 80 and a first lever member 61 of the front blade driving lever 51 and a push cam 75 for pressing the first lever member 61 of the front blade driving lever 51 to the front blade expansion position.SELECTED DRAWING: Figure 3

Description

The present invention relates to a blade driving device and an imaging device including the blade driving device, and more particularly to a blade driving device used as a focal plane shutter in a digital camera or the like.

In digital cameras and the like, a focal plane shutter that exposes and shields by moving the front curtain and the rear curtain with a time lag is known. For example, in a mirrorless camera, since it is necessary to display the subject before shooting on an electronic viewfinder or a liquid crystal monitor, both the front curtain and the rear curtain are retracted from the exposure opening and the exposure opening is opened before shooting. It becomes a normally open state. When shooting from such a normally open state, the exposure opening is temporarily closed by the front curtain at the time of release, and then the front curtain and the rear curtain are moved with a time lag for shooting (for example, Patent Document 1). reference).

In such a focal plane shutter, the lever that drives the front curtain is divided into two members, and a deterrent member that rotates in conjunction with the rotation of the set member is provided to realize shooting from a normally open state. ing. That is, the lever is composed of the first member connected to the front curtain and the second member held by the electromagnet in a state of being charged by the spring, and in the normally open state, the lever is rotated by the rotation of the set member. The front curtain is held at the position retracted from the exposure opening by moving the second member to the charge position and moving the first member of the lever in the direction opposite to the second member by the rotation of the restraint member. There is. At the time of release, the front curtain is moved so as to close the exposure opening by urging the first member with a spring. However, in such a conventional focal plane shutter, since the first member is moved only by the force of the spring to move the front curtain at the time of release, there is a problem that the lime lag from the release to the shooting becomes long. There is. Further, in order to increase the frame speed of shooting, it is necessary to increase the torque of the spring, which requires a large spring and makes the device large.

JP-A-2007-298544

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a small blade driving device and an imaging device capable of high-speed imaging.

According to the first aspect of the present invention, a small blade driving device capable of high-speed imaging is provided. This blade driving device includes a frame body having an opening, at least one front blade that can be moved to open and close the opening, and a front blade arm portion connected to the at least one front blade. It is provided with a front blade drive lever for opening and closing at least one of the front blades. The front blade drive lever has a front blade drive unit connected to the front blade arm portion, and is a first blade that can rotate between a front blade deployment position and a front blade retract position about a front blade drive shaft. It has a lever member and a second lever member that can rotate between the front blade charge position and the front blade release position about the front blade drive shaft. The second lever member has an engaging portion that engages with the first lever member when rotating from the front blade charge position to the front blade release position. The blade drive device can rotate about a front blade drive spring that urges the second lever member of the front blade drive lever from the front blade charge position to the front blade release position, and a lock shaft. It includes a lock member and a composite cam member that can rotate around the composite cam shaft. The lock member can engage with the first lever member of the front blade drive lever to lock the first lever member to the front blade retract position. The composite cam member includes an unlock cam that pushes the lock member by rotating about the composite cam shaft to release the locked state between the lock member and the first lever member of the tip blade drive lever. It has a push cam that pushes the first lever member of the front blade drive lever toward the front blade deployment position by rotating about the composite cam shaft. The blade drive device includes a front blade lever holding means for holding the second lever member of the front blade drive lever at the front blade charge position against the urging force of the front blade drive spring, and the front blade drive. It is provided with a front blade charge cam that comes into contact with the second lever member of the lever and moves the second lever member toward the front blade charge position.

According to such a configuration, when the front blade is moved after the setting operation, the first lever member of the front blade drive lever is pushed by the push cam of the composite cam member, so that the first lever of the front blade drive lever is pushed. It is possible to return the member to the front blade deployment position at high speed, and high-speed shooting is possible. Further, since the first lever member can be moved to the front blade deployment position by the push cam of the composite cam member, not only the torque of the spring for returning the front blade to the front blade deployment position can be reduced, but also such It is also possible to eliminate the spring. Further, since the unlock lock cam for releasing the locked state between the lock member and the first lever member of the front blade drive lever is formed on the composite cam member together with the push cam, the number of parts is reduced and the device is downsized. can do.

The push cam of the composite cam member abuts on the first lever member of the front blade drive lever when the first lever member of the front blade drive lever moves to the front blade deployment position. It is preferably configured. When the first lever member of the front blade drive lever is moved to the front blade deployment position, the push cam of the composite cam member is brought into contact with the first lever member of the front blade drive lever, so that the front blade drive lever is first. It is possible to prevent the lever member 1 from bouncing back due to the impact when it moves to the front blade deployment position. As described above, since a separate member is not required to suppress the rebound of the first lever member, the number of parts can be reduced and the device can be miniaturized.

The tip blade charge cam is preferably formed on the composite cam member. By forming the front blade charge cam together with the push cam and the unlock lock cam on the composite cam member in this way, the number of parts can be reduced and the device can be downsized.

The blade drive device may further include a return spring that urges the second lever member of the front blade drive lever from the front blade release position to the front blade charge position.

The blade drive device may further include a lock spring that urges the lock member in the lock direction to hold the lock member and the first lever member of the front blade drive lever in a locked state.

The blade driving device is connected to at least one rear blade that can be moved to open and close the opening, a rear blade arm portion that is connected to the at least one rear blade, and the rear blade arm portion. A rear blade drive lever that has a rear blade drive unit and can rotate between the rear blade charge position and the rear blade release position about the rear blade drive shaft, and the rear blade drive lever are moved from the rear blade charge position to the rear blade charge position. A rear blade drive spring that urges toward the rear blade release position, a rear blade lever holding means that holds the rear blade drive lever at the rear blade charge position against the urging force of the rear blade drive spring, and the above. A rear blade charge cam that comes into contact with the rear blade drive lever and moves the rear blade drive lever toward the rear blade charge position may be further provided.

The rear blade charge cam is preferably formed on the composite cam member. By forming the rear blade charge cam together with the push cam and the unlock lock cam on the composite cam member in this way, the number of parts can be reduced and the device can be downsized.

According to the second aspect of the present invention, a compact imaging device capable of high-speed imaging is provided. This image pickup device includes the above-mentioned blade drive device and an image pickup element arranged on a surface on which light transmitted through the opening of the frame of the blade drive device is imaged.

According to the present invention, the push cam of the composite cam member can push the first lever member toward the front blade deployment position to move the first lever member at high speed, so that high-speed imaging can be realized. Further, since the first lever member can be moved by the push cam of the composite cam member, not only the torque of the spring for returning the front blade to the front blade deployment position can be reduced, but also such a spring can be eliminated. Is also possible. Further, since the unlock lock cam for releasing the locked state between the lock member and the first lever member of the front blade drive lever is formed on the composite cam member together with the push cam, the number of parts is reduced and the device is downsized. can do.

FIG. 1 is a front view showing a blade driving device according to an embodiment of the present invention. FIG. 2 is a rear view of the blade drive device of FIG. FIG. 3 is a partially exploded perspective view of the blade drive device of FIG. FIG. 4 is a partially exploded perspective view of the blade drive device of FIG. FIG. 5 is an exploded perspective view showing a front blade and a front blade arm in the blade driving device of FIG. FIG. 6 is an exploded perspective view showing a rear blade and a rear blade arm in the blade driving device of FIG. FIG. 7 is a perspective view showing a front blade drive lever and a rear blade drive lever in the blade drive device of FIG. FIG. 8 is a perspective view showing a lock member in the blade drive device of FIG. 9A is a perspective view showing a composite cam member in the blade drive device of FIG. 1. 9B is a bottom view of the composite cam member of FIG. 9A. 9C is a cross-sectional view taken along the line CC of FIG. 9B. 9D is a cross-sectional view taken along the line DD of FIG. 9B. 9E is a cross-sectional view taken along the line EE of FIG. 9B. 9F is a cross-sectional view taken along the line FF of FIG. 9B. FIG. 10A is a schematic view showing the positional relationship between the second lever member of the front blade drive lever of the blade drive device, the rear blade drive lever, and the composite cam member when the exposure operation of FIG. 1 is completed. FIG. 10B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device when the exposure operation of FIG. 1 is completed. FIG. 11A is a schematic view showing the positional relationship between the second lever member, the rear blade drive lever, and the composite cam member of the front blade drive lever of the blade drive device during the set operation. FIG. 11B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device during the set operation. FIG. 12A is a schematic view showing the positional relationship between the second lever member of the front blade drive lever of the blade drive device, the rear blade drive lever, and the composite cam member when the set operation is completed. FIG. 12B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device when the set operation is completed. FIG. 13A is a schematic view showing the positional relationship between the second lever member of the front blade drive lever of the blade drive device, the rear blade drive lever, and the composite cam member after the release button is pressed. FIG. 13B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 14A is a schematic view showing the positional relationship between the second lever member, the rear blade drive lever, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 14B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 15A is a schematic view showing the positional relationship between the second lever member, the rear blade drive lever, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 15B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 16A is a schematic view showing the positional relationship between the second lever member of the front blade drive lever of the blade drive device, the rear blade drive lever, and the composite cam member after the release button is pressed. FIG. 16B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device after pressing the release button. FIG. 17A is a schematic view showing the positional relationship between the second lever member, the rear blade drive lever, and the composite cam member of the front blade drive lever of the blade drive device during the exposure operation. FIG. 17B is a schematic view showing the positional relationship between the first lever member, the lock member, and the composite cam member of the front blade drive lever of the blade drive device during the exposure operation.

Hereinafter, embodiments of the blade drive device according to the present invention will be described in detail with reference to FIGS. 1 to 17B. In FIGS. 1 to 17B, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted. Further, in FIGS. 1 to 17B, the scale and dimensions of each component may be exaggerated or some components may be omitted. In the following description, unless otherwise noted, terms such as "first" and "second" are only used to distinguish the components from each other and represent a particular order or order. It's not a thing.

FIG. 1 is a front view showing a blade driving device 1 according to an embodiment of the present invention, FIG. 2 is a rear view, and FIGS. 3 and 4 are partial decomposition perspective views. The blade driving device 1 in the present embodiment will be described as being a focal plane shutter incorporated in an optical device such as a camera, but this is merely an example, and the blade driving device according to the present invention is used for such a shutter. It is not limited to. Note that FIGS. 1 to 4 show a state when the exposure operation by the camera is completed.

As shown in FIGS. 1 to 4, the blade driving device 1 in the present embodiment includes a frame body 10 in which a rectangular opening (exposed opening) S is formed, and the frame body 10 and a cover (not shown). It includes eight blades 21-28 housed in a space formed between them. The blade drive device 1 is incorporated in an image pickup device including an image pickup device (not shown) such as a CCD or CMOS sensor. The light from the subject passes through the opening S of the frame body 10 and enters the image pickup element arranged on the back surface side of the blade driving device 1.

Each of the blades 21 to 28 is a thin plate-shaped member extending in the X direction as a whole, and eight blades 21 to 28 are stacked in order in the + Y direction. In the present embodiment, of the eight blades 21 to 28, the blades 21 to 24 are the front blades constituting the front curtain of the focal plane shutter, and the blades 25 to 28 are the rear blades constituting the rear curtain. There is.

The blade drive device 1 includes front blade arms 31 and 32 (front blade arm portions) connected to front blades 21 to 24 and rear blade arms 33 and 34 (rear blade arm portions) connected to rear blades 25 to 28. And include. FIG. 5 is an exploded perspective view showing the front blades 21 to 24 and the front blade arms 31 and 32, and FIG. 6 is an exploded perspective view showing the rear blades 25 to 28 and the rear blade arms 33 and 34.

As shown in FIG. 5, the front blade 21 is connected to the front blade arms 31 and 32 by pins 101 and 102, respectively, and the front blade 22 is connected to the front blade arms 31 and 32 by pins 103 and 104, respectively, and the front blade 23 is connected. Is connected to the front blade arms 31 and 32 by pins 105 and 106, respectively, and the front blade 24 is connected to the front blade arms 31 and 32 by pins 107 and 108, respectively. In this way, the link mechanism is composed of the front blades 21 to 24 and the front blade arms 31 and 32, respectively.

Further, as shown in FIG. 6, the rear blade 25 is connected to the rear blade arms 33 and 34 by pins 111 and 112, respectively, and the rear blade 26 is connected to the rear blade arms 33 and 34 by pins 113 and 114, respectively. The blades 27 are connected to the rear blade arms 33 and 34 by pins 115 and 116, respectively, and the rear blades 28 are connected to the rear blade arms 33 and 34 by pins 117 and 118, respectively. In this way, the link mechanism is composed of the rear blades 25 to 28 and the rear blade arms 33 and 34, respectively.

Returning to FIG. 3, the frame body 10 is formed with a front blade drive shaft 11, a rear blade drive shaft 12, and a composite cam shaft 13 extending in the + Y direction. Further, the frame body 10 is formed with an arc hole 14 along an arc centered on the front blade drive shaft 11 and an arc hole 15 along an arc centered on the rear blade drive shaft 12.

As shown in FIG. 4, the frame body 10 is formed with support shafts 41 to 44 extending in the −Y direction. Of these support shafts 41 to 44, the support shaft 41 is located coaxially with the above-mentioned front blade drive shaft 11, and the support shaft 42 is located coaxially with the rear blade drive shaft 12.

As shown in FIG. 5, a shaft hole 312 through which the support shaft 41 of the frame body 10 is inserted is provided in the vicinity of the end portion of the front blade arm 31, and the support shaft 41 is provided in the shaft hole 312 of the front blade arm 31. Is inserted so that the front blade arm 31 can rotate about the support shaft 41 of the frame body 10. Further, a substantially rectangular lever connecting hole 314 is formed at a position slightly distant from the shaft hole 312 of the front blade arm 31. Further, a shaft hole 322 through which the support shaft 43 of the frame body 10 is inserted is formed in the vicinity of the end portion of the front blade arm 32, and the support shaft 43 is inserted into the shaft hole 322 of the front blade arm 32. The front blade arm 32 can rotate about the support shaft 43 of the frame body 10.

As shown in FIG. 6, a shaft hole 332 through which the support shaft 44 of the frame body 10 is inserted is formed in the vicinity of the end portion of the rear blade arm 33. By inserting the support shaft 44 into the shaft hole 332 of the rear blade arm 33, the rear blade arm 33 can rotate about the support shaft 44 of the frame body 10. Further, a shaft hole 342 through which the support shaft 42 of the frame body 10 is inserted is provided near the end of the rear blade arm 34, and the support shaft 42 is inserted into the shaft hole 342 of the rear blade arm 34. As a result, the rear blade arm 34 can rotate about the support shaft 42 of the frame body 10. Further, a substantially rectangular lever connecting hole 344 is formed at a position slightly distant from the shaft hole 342 of the rear blade arm 34.

As shown in FIG. 5, the front blades 21 to 24 are connected to the front blade arms 31 and 32 in a state of being overlapped in order in the + Y direction. Therefore, when the front blade arm 31 rotates about the support shaft 41 and the front blade arm 32 rotates about the support shaft 43, the link mechanism described above changes the region where the front blades 21 to 24 overlap each other while changing the region where the front blades 21 to 24 overlap each other. It is designed to move mainly in the Z direction.

Similarly, as shown in FIG. 6, the rear blades 25 to 28 are connected to the rear blade arms 33 and 34 in a state of being sequentially overlapped in the + Y direction. Therefore, when the rear blade arm 33 rotates about the support shaft 44 and the rear blade arm 34 rotates about the support shaft 42, the link mechanism described above changes the region where the rear blades 25 to 28 overlap each other while changing the region where the rear blades 25 to 28 overlap each other. It is designed to move mainly in the Z direction.

Returning to FIG. 3, the blade drive device 1 includes a front blade drive lever 51 attached to the front blade drive shaft 11 of the frame body 10, a rear blade drive lever 52 attached to the rear blade drive shaft 12 of the frame body 10. A front blade drive spring 53 mounted on the front blade drive lever 51, a rear blade drive spring 54 mounted on the rear blade drive lever 52, a composite cam member 70 attached to the composite cam shaft 13 of the frame body 10, and a frame. A lock member 80 attached to the bearing portion 19 of the body 10 and a lock spring 55 attached to the lock member 80 are provided.

FIG. 7 is a perspective view showing the front blade drive lever 51 and the rear blade drive lever 52. As shown in FIG. 7, the front blade drive lever 51 includes a first lever member 61 and a second lever member 62 that can rotate about the front blade drive shaft 11 of the frame body 10. The first lever member 61 includes a shaft portion 611 through which the front blade drive shaft 11 of the frame body 10 is inserted, an arm portion 612 extending radially outward from the shaft portion 611, and a radial outer end portion of the arm portion 612. It has a tip blade drive unit 613 extending in the −Y direction, a protrusion 614 protruding radially outward from the shaft portion 611, and an operating portion 615 located on the opposite side of the shaft portion 611 from the arm portion 612. doing. By inserting the front blade drive shaft 11 of the frame body 10 into the shaft portion 611 of the first lever member 61, the first lever member 61 can rotate about the front blade drive shaft 11 of the frame body 10. It has become. The first lever member 61 is attached to the front blade drive shaft 11 in a state of being urged clockwise in FIG. 1 around the front blade drive shaft 11 by, for example, a return spring (not shown) made of a torsion coil spring. ing.

The second lever member 62 is from a cylindrical shaft portion 621 through which the front blade drive shaft 11 of the frame body 10 is inserted, a first arm portion 622 extending radially outward from the shaft portion 621, and a shaft portion 621. Arranged on a second arm 629 extending radially outward in a direction different from the first arm 622, a roller 625 attached to the tip of the second arm 629, and a first arm 622. It has a metal plate 626 and a holder 627 for holding the metal plate 626. By inserting the front blade drive shaft 11 of the frame body 10 into the shaft portion 621 of the second lever member 62, the second lever member 62 can rotate about the front blade drive shaft 11 of the frame body 10. It has become.

The front blade driving portion 613 of the first lever member 61 of the front blade driving lever 51 is arranged so as to project in the −Y direction of the frame body 10 through the arc hole 14 of the frame body 10. When the first lever member 61 of the front blade drive lever 51 rotates about the front blade drive shaft 11, the front blade drive portion 613 of the first lever member 61 moves in the arc hole 14. A damper 17 (see FIG. 4) for shock absorption is provided at the end of the arc hole 14 of the frame body 10 on the −Z direction side.

As shown in FIG. 2, in the lever connecting hole 314 of the front blade arm 31, the front blade driving portion 613 protruding in the −Y direction side of the frame 10 through the arc hole 14 of the frame 10 is fitted without a gap. doing. As described above, since the support shaft 41 of the frame body 10 is located coaxially with the front blade drive shaft 11, the front blade drive unit 613 of the first lever member 61 of the front blade drive lever 51 drives the front blades. When rotating around the shaft 11, the front blade arm 31 rotates around the support shaft 41. As a result, the front blade arm 32 rotates about the support shaft 43 via the link mechanism described above, and the front blades 21 to 24 move mainly in the Z direction while changing the overlapping region.

In the state where the exposure operation shown in FIG. 1 is completed, the front blades 21 to 24 are in a position retracted from the opening S of the frame body 10. Hereinafter, the position of the first lever member 61 of the front blade drive lever 51 in this state is referred to as the “front blade retract position”. From this state, the first lever member 61 of the front blade drive lever 51 rotates clockwise around the front blade drive shaft 11 by the operation described later, so that the front blades 21 to 24 move in the + Z direction as a whole. The opening S of the frame body 10 is closed. The position of the first lever member 61 of the front blade drive lever 51 in this state is referred to as the "front blade deployment position".

In the present embodiment, the front blade drive spring 53 is composed of a torsion coil spring, and as shown in FIG. 3, the coil portion of the front blade drive spring 53 is the second lever member 62 of the front blade drive lever 51. It is arranged around the shaft portion 621. One end of the front blade drive spring 53 is engaged with an engaging portion 628 (see FIG. 7) of the second lever member 62 of the front blade drive lever 51. The other end of the front blade drive spring 53 is engaged with a frame (not shown) to which the blade drive device 1 is attached. The front blade drive spring 53 is arranged in a twisted state with the front blade drive shaft 11 as the center in FIG. 1 so as to urge the front blade drive lever 51 counterclockwise.

As shown in FIG. 1, the blade driving device 1 includes a front blade electromagnet 5 as a front blade lever holding means for holding a second lever member 62 of the front blade driving lever 51 at a predetermined position. From the state where the exposure operation is completed (FIG. 1), the second lever member 62 of the front blade drive lever 51 can be rotated clockwise against the urging force of the front blade drive spring 53 to be charged by the operation described later. can. The second lever member 62 of the front blade drive lever 51 is held by the front blade electromagnet 5 at a charged position, and the holding by the front blade electromagnet 5 is released at a predetermined timing. As a result, the second lever member 62 of the front blade drive lever 51 rotates counterclockwise to the position shown in FIG. 1 by the urging force of the front blade drive spring 53. Hereinafter, the position of the front blade drive lever 51 shown in FIG. 1 is referred to as the “front blade release position”, and the position held by the front blade electromagnet 5 is referred to as the “front blade charge position”. Further, the direction in which the front blade drive lever 51 is urged by the front blade drive spring 53, that is, the direction from the front blade charge position to the front blade release position (counterclockwise in FIG. 1) is referred to as the "front blade release direction". , The direction opposite to this is referred to as the "front blade charge direction".

As shown in FIG. 7, the first arm portion 622 of the second lever member 62 of the front blade drive lever 51 engages with the engaging portion 622A that engages with the side surface 612A of the arm portion 612 of the first lever member 61. Have. The first lever member 61 and the second lever member 62 can independently rotate about the front blade drive shaft 11, but the second lever member 62 releases the front blade from the front blade charge position. When rotating toward the position, the engaging portion 622A of the second lever member 62 engages with the side surface 612A of the arm portion 612 of the first lever member 61, so that the first lever member 61 and the first lever member 61 are engaged. The lever member 62 of No. 2 is integrally rotated.

As shown in FIG. 7, the rear blade drive lever 52 includes a shaft portion 521 through which the rear blade drive shaft 12 of the frame body 10 is inserted, a first arm portion 522 extending radially outward from the shaft portion 521, and a first arm portion 522. The rear blade drive portion 523 extending in the −Y direction from the radial outer end of the arm portion 522 of 1, and the second arm portion extending radially outward in a direction different from that of the shaft portion 521 to the first arm portion 522. It has a 529, a roller 525 attached to the tip of the second arm portion 529, a metal plate 526 arranged on the first arm portion 522, and a holder 527 for holding the metal plate 526. By inserting the rear blade drive shaft 12 of the frame body 10 into the shaft portion 521 of the rear blade drive lever 52, the rear blade drive lever 52 can rotate about the rear blade drive shaft 12 of the frame body 10. ing.

The rear blade drive unit 523 of the rear blade drive lever 52 is arranged so as to project in the −Y direction of the frame body 10 through the arc hole 15 of the frame body 10. When the rear blade drive lever 52 rotates about the rear blade drive shaft 12, the rear blade drive portion 523 of the rear blade drive lever 52 moves in the arc hole 15. A damper 18 (see FIG. 4) for shock absorption is provided at the end of the arc hole 15 of the frame body 10 on the −Z direction side.

As shown in FIG. 2, in the lever connecting hole 344 of the rear blade arm 34, the rear blade driving portion 523 protruding in the −Y direction side of the frame body 10 through the arc hole 15 of the frame body 10 is fitted without a gap. doing. As described above, since the support shaft 42 of the frame body 10 is located coaxially with the rear blade drive shaft 12, when the rear blade drive unit 523 of the rear blade drive lever 52 rotates about the rear blade drive shaft 12. , The rear blade arm 34 rotates about the support shaft 42. As a result, the rear blade arm 33 rotates about the support shaft 44 via the link mechanism described above, and the rear blades 25 to 28 move mainly in the Z direction while changing the region where the rear blades 25 to 28 overlap each other.

In the present embodiment, the rear blade drive spring 54 is composed of a torsion coil spring, and as shown in FIG. 3, the coil portion of the rear blade drive spring 54 is arranged around the shaft portion 521 of the rear blade drive lever 52. Will be done. Further, one end of the rear blade drive spring 54 is engaged with the engaging portion 528 (see FIG. 7) of the rear blade drive lever 52. The other end of the rear blade drive spring 54 is engaged with a frame (not shown) to which the blade drive device 1 is attached. The rear blade drive spring 54 is arranged in a twisted state with the rear blade drive shaft 12 as the center in FIG. 1 so as to urge the rear blade drive lever 52 counterclockwise.

As shown in FIG. 1, the blade driving device 1 includes a rear blade electromagnet 6 as a rear blade lever holding means for holding the rear blade driving lever 52 at a predetermined position. From the state where the exposure operation is completed (FIG. 1), the rear blade drive lever 52 can be rotated clockwise against the urging force of the rear blade drive spring 54 to be charged by the operation described later. The rear blade drive lever 52 is held by the rear blade electromagnet 6 at the charged position, and the holding by the rear blade electromagnet 6 is released at a predetermined timing. As a result, the rear blade drive lever 52 is rotated counterclockwise to the position shown in FIG. 1 by the urging force of the rear blade drive spring 54. Hereinafter, the position of the rear blade drive lever 52 shown in FIG. 1 is referred to as a “rear blade release position”, and the position held by the rear blade electromagnet is referred to as a “rear blade charge position”. Further, the direction in which the rear blade drive lever 52 is urged by the rear blade drive spring 54, that is, the direction from the rear blade charge position to the rear blade release position (counterclockwise in FIG. 1) is referred to as the "rear blade release direction". , The direction opposite to this is referred to as the "rear blade charge direction".

FIG. 8 is a perspective view showing the lock member 80. As shown in FIG. 8, the lock member 80 includes a shaft portion 81 mounted on the bearing portion 19 of the frame body 10, a stopper portion 82 extending radially outward from the shaft portion 81, and a stopper portion 82 from the shaft portion 81. Is accommodated in an actuating portion 83 extending radially outward in different directions, a spring receiver 84 that receives one end of a lock spring 55 (see FIG. 3), and a groove 7 (see FIG. 1) formed in the frame body 10. It has a piece of 85.

The lock spring 55 in the present embodiment is composed of a torsion coil spring, and as shown in FIG. 3, the coil portion of the lock spring 55 is arranged around the shaft portion 81 of the lock member 80. One end of the lock spring 55 is engaged with the spring receiver 84, and the other end is engaged with the spring receiver 8 (see FIG. 3) provided on the frame body 10. The lock spring 55 is arranged in a twisted state so as to urge the lock member 80 counterclockwise around the shaft portion 81 (lock shaft) of the lock member 80 in FIG. Hereinafter, the direction in which the lock member 80 is urged by the lock spring 55 is referred to as the "locking direction", and the direction opposite to this is referred to as the "unlocking direction". When no external force other than the urging force of the lock spring 55 is acting on the lock member 80, the lock member 80 is urged in the locking direction by the lock spring 55, and the engaging piece 85 of the lock member 80 moves to the end of the groove 7. It will be in the state of.

The stopper portion 82 of the lock member 80 is configured to be engageable with the protrusion 614 of the first lever member 61 of the front blade drive lever 51, and the stopper portion 82 of the lock member 80 is the first of the front blade drive lever 51. By engaging with the protrusion 614 of the lever member 61 of 1, the rotation of the first lever member 61 toward the front blade deployment position is restricted.

9A is a perspective view showing the composite cam member 70, FIG. 9B is a bottom view, FIG. 9C is a sectional view taken along line CC of FIG. 9B, FIG. 9D is a sectional view taken along line DD of FIG. 9B, and FIG. 9E is FIG. 9B. EE line cross-sectional view, FIG. 9F is a FF line cross-sectional view of FIG. 9B. As shown in FIGS. 9A to 9F, the composite cam member 70 includes a gear 71 having teeth formed on the outer periphery, a shaft portion 72 into which the composite cam shaft 13 of the frame body 10 is inserted, and a rear blade drive lever 52. A rear blade charge cam 73 that moves toward the rear blade charge position, a front blade charge cam 74 that moves the second lever member 62 of the front blade drive lever 51 toward the front blade charge position, and a front blade drive lever 51. The push cam 75 that pushes the first lever member 61 toward the front blade charge position, and the unlock cam 76 that releases the locked state between the lock member 80 and the first lever member 61 of the front blade drive lever 51, which will be described later. And is included.

By inserting the composite cam shaft 13 of the frame body 10 into the shaft portion 72 of the composite cam member 70, the composite cam member 70 can rotate about the composite cam shaft 13 of the frame body 10. The gear 71 of the composite cam member 70 meshes with a gear of a gear mechanism 3 (see FIG. 1) driven by a motor (not shown). Therefore, the composite cam member 70 is adapted to rotate about the composite cam shaft 13 by driving the gear mechanism 3.

As shown in FIG. 9C, the rear blade charge cam 73 extends radially outward in a predetermined angular range from the shaft portion 72. The rear blade charge cam 73 is arranged at the same height as the roller 525 of the rear blade drive lever 52 in the Y direction, and abuts on the roller 525 of the rear blade drive lever 52 when the composite cam member 70 rotates. It has become like.

As shown in FIG. 9D, the front blade charge cam 74 extends radially outward in a predetermined angular range from the shaft portion 72. In FIG. 9C, most of the front blade charge cam 74 does not overlap with the rear blade charge cam 73, but some of them overlap in the circumferential direction. The front blade charge cam 74 is arranged at the same height as the roller 625 of the second lever member 62 of the front blade drive lever 51 in the Y direction, and when the composite cam member 70 rotates, the front blade drive lever 51 It comes into contact with the roller 625 of the second lever member 62 of the above.

As shown in FIG. 9B, the rear blade charge cam 73 and the front blade charge cam 74 are arranged apart from each other in the Y direction, and a space 78 is provided between the rear blade charge cam 73 and the front blade charge cam 74. It is formed. In this space 78, the second arm portion 629 of the second lever member 62 of the front blade drive lever 51 and the second arm portion 529 of the rear blade drive lever 52 are located, and the front blade drive lever 51 The roller 625 extending in the −Y direction from the second arm portion 629 of the second lever member 62 abuts on the front blade charge cam 74, and the roller 525 extending in the + Y direction from the second arm portion 529 of the rear blade drive lever 52. Is configured to come into contact with the rear blade charge cam 73.

The push cam 75 is located on the −Y direction side of the front blade charge cam 74. The push cam 75 is arranged at the same height as the operating portion 615 of the first lever member 61 of the front blade drive lever 51 in the Y direction, and the front blade drive lever 51 is rotated by the rotation of the composite cam member 70. It comes into contact with the operating portion 615 of the first lever member 61 of the above.

The unlock cam 76 is located on the −Y direction side of the push cam 75. The unlock cam 76 is arranged at the same height as the operating portion 83 of the lock member 80 in the Y direction, and the composite cam member 70 rotates to come into contact with the operating portion 83 of the lock member 80. ing.

Next, the operation of the blade driving device 1 having such a configuration will be described. In the blade driving device 1, the rear blades 25 to 28 move from the exposure operation completed state shown in FIG. 1 to a position retracted from the opening S of the frame body 10, and the setting operation is completed. When the release button of the camera is pressed in this state, the front blades 21 to 24 temporarily close the opening S of the frame body 10 while the rear blades 25 to 28 remain at that position. Then, the shooting exposure is started when the front blades 21 to 24 start to open the opening S. Following the front blades 21 to 24, the rear blades 25 to 28 enter the opening S, and the photographing exposure is completed when the rear blades 25 to 28 close the opening S completely. Hereinafter, this series of operations will be described with reference to FIGS. 10A to 17B.

10A, 11A, 12A, 13A, 14A, 15A, 16A, and 17A show the second lever member 62, the rear blade drive lever 52, and the composite cam member 70 of the front blade drive lever 51. 10B, 11B, 12B, 13B, 14B, 15B, 16B, and 17B are the first lever member 61 and the lock member 80 of the front blade drive lever 51. , And is a schematic view showing the positional relationship of the composite cam member 70. 10A and 10B show when the exposure operation is completed, FIGS. 11A and 11B are during the set operation, and FIGS. 12A and 12B show when the set operation is completed, FIGS. 13A, 13B, 14A, 14B and 15A. 15B, 16A, and 16B show the state during the exposure operation, respectively, after pressing the release button. In FIGS. 10A and 17A, the composite cam member 70 is shown in a cross-sectional view taken along a plane located between the rear blade charge cam 73 and the front blade charge cam 74, and is shown in FIGS. 11A, 12A, and 13A. 14A, 15A, and 16A, the composite cam member 70 is shown in cross-sectional view when cut in a plane including the rear blade charge cam 73, and is shown in FIGS. 10B, 11B, 12B, and 13B. , 14B, 15B, 16B, and 17B, the composite cam member 70 is shown in a cross-sectional view cut along a plane including the push cam 75.

As shown in FIG. 10A, in the state where the exposure operation is completed, the front blade charge cam 74 of the composite cam member 70 is not in contact with the roller 625 of the second lever member 62 of the front blade drive lever 51. The second lever member 62 of the blade drive lever 51 is moved to the front blade release position by the urging force of the front blade drive spring 53. Further, since the rear blade charge cam 73 of the composite cam member 70 is not in contact with the roller 525 of the rear blade drive lever 52, the rear blade drive lever 52 moves to the rear blade release position by the urging force of the rear blade drive spring 54. Has been done.

As shown in FIG. 10B, since the lock member 80 is not in contact with the unlock cam 76 of the composite cam member 70, the lock member 80 is moved in the locking direction by the urging force of the lock spring 55. At this time, the protrusion 614 of the first lever member 61 of the front blade drive lever 51 comes into contact with the stopper portion 82 of the lock member 80, and the rotation of the first lever member 61 toward the front blade deployment position is restricted. The lever member 61 of 1 stays at the front blade retracted position. As a result, the front blades 21 to 24 stay at a position retracted from the opening S via the front blade arm 31 connected to the front blade drive unit 613 of the first lever member 61 and the link mechanism described above.

When the set operation is performed from the state where the exposure operation is completed, the gear mechanism 3 is driven by a motor (not shown) to rotate the composite cam member 70 counterclockwise in FIG. 10A. When the composite cam member 70 rotates in this way, as shown in FIG. 11A, the front blade charge cam 74 of the composite cam member 70 comes into contact with the roller 625 of the second lever member 62 of the front blade drive lever 51, and the tip The blade charge cam 74 rotates the second lever member 62 of the front blade drive lever 51 to the front blade charge position in the front blade charge direction (clockwise in FIG. 11A) against the urging force of the front blade drive spring 53. Here, since the surface of the second lever member 62 of the front blade drive lever 51 with which the front blade charge cam 74 comes into contact is a curved surface (outer peripheral surface of the roller 625), the front blade charge cam 74 is the second lever member 62. The frictional force at the time of contacting the second lever member 62 can be reduced, and the torque required to rotate the second lever member 62 can be reduced. A cylindrical pin may be used instead of the roller 625 of the second lever member 62.

At this time, as shown in FIG. 11B, even if the composite cam member 70 rotates, the unlock cam 76 of the composite cam member 70 does not come into contact with the lock member 80. Therefore, the stopper portion 82 of the lock member 80 remains engaged with the protrusion 614 of the first lever member 61 of the front blade drive lever 51, and the first lever member 61 does not move from the front blade retracted position. The front blades 21 to 24 also do not move.

Similarly, when the composite cam member 70 rotates, as shown in FIG. 11A, the rear blade charge cam 73 of the composite cam member 70 comes into contact with the roller 525 of the rear blade drive lever 52, and the rear blade charge cam 73 moves to the rear blade. The drive lever 52 is rotated to the rear blade charge position in the rear blade charge direction (clockwise in FIG. 11A) against the urging force of the rear blade drive spring 54. As a result, the rear blades 25 to 28 move mainly in the + Z direction while changing the region overlapping with the rear blade arm 34 connected to the rear blade drive unit 523 of the rear blade drive lever 52 and the link mechanism described above. It retracts to the outside of the opening S of the frame body 10. Here, since the surface of the rear blade drive lever 52 with which the rear blade charge cam 73 abuts is a curved surface (the outer peripheral surface of the roller 525), the frictional force when the rear blade charge cam 73 abuts with the rear blade drive lever 52 is applied. It can be reduced, and the torque required to rotate the rear blade drive lever 52 can be reduced. A cylindrical pin may be used instead of the roller 525 of the rear blade drive lever 52.

In this way, the rear blade drive lever 52 is rotated in the rear blade charge direction by the rear blade charge cam 73 of the composite cam member 70, so that the rear blades 25 to 28 open the opening S of the frame body 10 as shown in FIG. 12A. The set operation is completed by moving to the position retracted from. At this time, as shown in FIG. 12B, since the unlock cam 76 of the composite cam member 70 does not come into contact with the lock member 80, the stopper portion 82 of the lock member 80 is a protrusion of the first lever member 61 of the front blade drive lever 51. It remains engaged with section 614. Therefore, the first lever member 61 does not move from the front blade retracted position, and the front blades 21 to 24 do not move and stay at the position retracted to the outside of the opening S of the frame body 10. Therefore, in the state where this set operation is completed, as shown in FIGS. 12A and 12B, the opening S of the frame body 10 is completely opened. In this state, the subject before shooting can be imaged by the image sensor of the camera and displayed on the electronic viewfinder or the liquid crystal monitor.

When the release button of the camera is pressed in this state, a current is supplied to the coil of the front-blade electromagnet 5 and the coil of the rear-blade electromagnet 6. As a result, the metal plate 626 of the second lever member 62 of the front blade drive lever 51 is magnetically attracted to the iron core 5A (see FIG. 12A) of the front blade electromagnet 5, and the second lever member 62 of the front blade drive lever 51. Is held at the tip blade charge position. Further, the metal plate 526 of the rear blade drive lever 52 is attracted by magnetic force to the iron core 6A (see FIG. 12A) of the rear blade electromagnet 6, and the rear blade drive lever 52 is held at the rear blade charge position.

Then, the gear mechanism 3 is driven to rotate the composite cam member 70 counterclockwise as shown in FIGS. 13A and 13B. At this time, as shown in FIG. 13A, the front blade charge cam 74 of the composite cam member 70 comes into contact with the roller 625 of the second lever member 62 of the front blade drive lever 51, and the rear blade charge cam 73 is the rear blade drive lever. Since it is in contact with the roller 525 of 52, the second lever member 62 and the rear blade drive lever 52 of the front blade drive lever 51 do not change their positions.

On the other hand, as shown in FIG. 13B, when the composite cam member 70 rotates, the unlock cam 76 of the composite cam member 70 comes into contact with the operating portion 83 of the lock member 80, and the lock member 80 resists the urging force of the lock spring 55. Then it is pushed in the unlock direction and rotates. As a result, the stopper portion 82 of the lock member 80 and the protrusion 614 of the first lever member 61 of the front blade drive lever 51 are disengaged, and the first lever member 61 of the front blade drive lever 51 is a return spring. It rotates toward the front blade deployment position by the urging force of. As a result, the front blades 21 to 24 change the region overlapping with the front blade arm 31 connected to the front blade drive portion 613 of the first lever member 61 of the front blade drive lever 51 via the link mechanism described above. While moving mainly in the + Z direction.

Further, when the composite cam member 70 rotates, as shown in FIG. 14B, the push cam 75 of the composite cam member 70 comes into contact with the operating portion 615 of the first lever member 61 of the front blade drive lever 51, and the composite cam member 70 Push cam 75 pushes the first lever member 61 toward the front blade deployment position. Also at this time, as shown in FIG. 14A, the front blade charge cam 74 of the composite cam member 70 comes into contact with the roller 625 of the second lever member 62 of the front blade drive lever 51, and the rear blade charge cam 73 is rear. Since the blade drive lever 52 is in contact with the roller 525, the positions of the second lever member 62 and the rear blade drive lever 52 of the front blade drive lever 51 do not change.

As shown in FIG. 15B, the first lever member 61 of the front blade drive lever 51 is rotated to the front blade drive position by the urging force of the return spring and the pressure of the push cam 75 of the composite cam member 70. , The front blades 21 to 24 move in the + Z direction by the front blade arm 31 connected to the front blade drive unit 613 of the first lever member 61 and the link mechanism described above, and the opening S of the frame body 10 is the front blade 21. It is blocked by ~ 24.

At this time, as shown in FIG. 15A, the roller 625 of the second lever member 62 of the front blade drive lever 51 separates from the front blade charge cam 74 of the composite cam member 70, but a current is supplied to the coil of the front blade electromagnet 5. Therefore, the metal plate 626 of the second lever member 62 of the front blade drive lever 51 is attracted to the iron core 5A of the front blade electromagnet 5 by magnetic force, and the second lever member 62 of the front blade drive lever 51 is the front blade. It is held in the charge position. Similarly, the roller 525 of the rear blade drive lever 52 is separated from the rear blade charge cam 73 of the composite cam member 70, but since the current is supplied to the coil of the rear blade electromagnet 6, the metal plate 526 of the rear blade drive lever 52 Is attracted to the iron core 6A of the rear blade electromagnet 6 by magnetic force, and the rear blade drive lever 52 is held at the rear blade charge position.

Here, when the first lever member 61 of the front blade drive lever 51 moves to the front blade deployment position, as shown in FIG. 15B, the push cam 75 of the composite cam member 70 described above is the first lever member. It comes into contact with the operating portion 615 of 61. Therefore, the first lever member 61 cannot move in either direction. Therefore, it is possible to prevent the first lever member 61 from bouncing back due to the impact when the first lever member 61 moves to the front blade deployment position. As described above, since a separate member is not required to suppress the rebound of the first lever member 61, the number of parts can be reduced and the device can be miniaturized.

Next, the gear mechanism 3 is driven to further rotate the composite cam member 70, and as shown in FIG. 16B, the push cam 75 of the composite cam member 70 is moved to the operating portion of the first lever member 61 of the front blade drive lever 51. Move it to a position that does not interfere with 615. At this time, as shown in FIG. 16A, the second lever member 62 and the rear blade drive lever 52 of the front blade drive lever 51 are held at the front blade charge position and the rear blade charge position by the above-mentioned electromagnets 5 and 6, respectively. It remains.

When starting the exposure operation, first, the supply of the current to the coil of the front vane electromagnet 5 is stopped. As a result, the electromagnetic attraction of the second lever member 62 of the front blade drive lever 51 by the front blade electromagnet 5 is released, and as shown in FIG. 17A, the second lever member 62 is urged by the front blade drive spring 53. It moves from the front blade charge position to the front blade release position. At this time, since the engaging portion 622A of the second lever member 62 engages with the side surface 612A of the arm portion 612 of the first lever member 61, the first lever member 61 and the second lever member 62 are integrated. As shown in FIG. 17B, the first lever member 61 moves toward the front blade retracting position. Along with this, the front blades 21 to 24 change the region where the front blade arms 31 connected to the front blade drive unit 613 of the first lever member 61 and the front blade arm 31 overlap each other via the above-described link mechanism, and mainly in the −Z direction. Move to.

After a desired exposure time has elapsed from the start of the exposure operation, the supply of current to the coil of the rear blade electromagnet 6 is stopped. As a result, the electromagnetic attraction of the rear blade drive lever 52 by the rear blade electromagnet 6 is released, and as shown in FIG. 17A, the rear blade drive lever 52 releases the rear blade from the rear blade charge position by the urging force of the rear blade drive spring 54. Move towards position. Along with this, the rear blades 25 to 28 change the region where the rear blades 25 to 28 overlap each other via the link mechanism described above with the rear blade arm 34 connected to the rear blade drive unit 523 of the rear blade drive lever 52, and the front blades 21 to 21. Following 24, it moves mainly in the −Z direction.

By such an exposure operation, as shown in FIGS. 17A and 17B, an exposure gap E formed between the front blade 21 and the rear blade 28 is formed from the lower side to the upper side of the opening S of the frame body 10. It moves and the image sensor is exposed. The exposure operation is completed when the second lever member 62 and the rear blade drive lever 52 of the front blade drive lever 51 reach the front blade release position and the rear blade release position, respectively, and the states shown in FIGS. 10A and 10B are obtained.

As described above, according to the present embodiment, when the front blades 21 to 24 are moved after the set operation, not only the urging force of the return spring but also the composite force is applied to the first lever member 61 of the front blade drive lever 51. Since the pressing force of the push cam 75 of the cam member 70 acts, the first lever member 61 of the front blade drive lever 51 can be returned to the front blade deployment position at high speed, and high-speed shooting becomes possible. Further, since the first lever member 61 can be moved to the front blade deployment position by the push cam 75 of the composite cam member 70, the torque of the return spring for returning the front blades 21 to 24 to the front blade deployment position is reduced. Not only can it be possible, but it is also possible to eliminate such return springs.

Further, in the present embodiment, the rear blade charge cam 73 that moves the rear blade drive lever 52 toward the rear blade charge position and the second lever member 62 of the front blade drive lever 51 are moved toward the front blade charge position. The front blade charge cam 74 to be operated, the push cam 75 that pushes the first lever member 61 of the front blade drive lever 51 toward the front blade charge position, the lock member 80, and the first lever member 61 of the front blade drive lever 51. Since the unlock cam 76 that releases the lock state is formed on the composite cam member 70, the number of parts can be reduced and the device can be miniaturized.

In the above-described embodiment, an example in which four front blades 21 to 24 are used as the front curtain of the focal plane shutter and four rear blades 25 to 28 are used as the rear curtain has been described, but the front curtain is configured. The number of the front blades and the rear blades constituting the rear curtain may be any number as long as they are one or more.

Further, in the above-described embodiment, the lock member 80 is urged in the lock direction by the lock spring 55, but the lock member 80 is connected to a drive mechanism such as a motor and the drive mechanism is driven to drive the lock member 80. It may be moved in the locking direction and the unlocking direction.

In addition, the term indicating the positional relationship used in the present specification is used in relation to the illustrated embodiment, and changes depending on the relative positional relationship of the apparatus.

Although the preferred embodiment of the present invention has been described so far, it goes without saying that the present invention is not limited to the above-described embodiment and may be implemented in various different forms within the scope of the technical idea.

1 Blade drive device 3 Gear mechanism 5 Front blade electric magnet 6 Rear blade electric magnet 10 Frame body 11 Front blade drive shaft 12 Rear blade drive shaft 13 Composite cam shaft 14,15 Arc holes 21 to 24 Front blades 25 to 28 Rear blades 31, 32 Front blade arm (front blade arm part)
33, 34 Rear blade arm (rear blade arm part)
41-44 Support shaft 51 Front blade drive lever 52 Rear blade drive lever 53 Front blade drive spring 54 Rear blade drive spring 55 Lock spring 61 First lever member 62 Second lever member 70 Composite cam member 71 Gear 72 Shaft 73 Rear Blade charge cam 74 Front blade charge cam 75 Push cam 76 Unlock cam 80 Lock member 82 Stopper part 83 Acting part 314 Lever connecting hole 344 Lever connecting hole 523 Rear blade driving part 525 Roller 613 Front blade driving part 614 Protruding part 615 Acting part 622A Engagement part 625 Roller E Gap S Opening

Claims (8)

The frame with the opening and
With at least one tip blade that can be moved to open and close the opening,
The front blade arm portion connected to the at least one front blade and the front blade arm portion.
A front blade drive lever for opening and closing at least one front blade.
A first lever member having a front blade drive unit connected to the front blade arm portion and capable of rotating between a front blade deployment position and a front blade retract position about a front blade drive shaft, and a first lever member.
A second lever member that can rotate between the front blade charge position and the front blade release position about the front blade drive shaft, and when rotating from the front blade charge position toward the front blade release position. A front blade drive lever having a second lever member having an engaging portion that engages with the first lever member,
A front blade drive spring that urges the second lever member of the front blade drive lever from the front blade charge position to the front blade release position.
A lock member that is rotatable about a lock shaft and that can engage with the first lever member of the front blade drive lever to lock the first lever member to the front blade retracted position. ,
A composite cam member that can rotate around the composite cam shaft.
An unlock cam that pushes the lock member by rotating about the composite cam shaft to release the locked state between the lock member and the first lever member of the tip blade drive lever.
A composite cam member having a push cam that pushes the first lever member of the front blade drive lever toward the front blade deployment position by rotating about the composite cam shaft, and a composite cam member.
A front blade lever holding means for holding the second lever member of the front blade drive lever at the front blade charge position against the urging force of the front blade drive spring.
A blade drive device including a front blade charge cam that comes into contact with the second lever member of the front blade drive lever and moves the second lever member toward the front blade charge position. The push cam of the composite cam member comes into contact with the first lever member of the front blade drive lever when the first lever member of the front blade drive lever moves to the front blade deployment position. The blade driving device according to claim 1, which is configured. The blade driving device according to claim 1 or 2, wherein the front blade charge cam is formed on the composite cam member. The blade according to any one of claims 1 to 3, further comprising a return spring that urges the second lever member of the front blade drive lever from the front blade release position toward the front blade charge position. Drive device. The invention according to any one of claims 1 to 4, further comprising a lock spring that urges the lock member in the lock direction to hold the lock member and the first lever member of the tip blade drive lever in a locked state. The blade drive device described. With at least one rear blade that can be moved to open and close the opening,
With the rear blade arm portion connected to at least one rear blade,
A rear blade drive lever that has a rear blade drive unit connected to the rear blade arm unit and can rotate between the rear blade charge position and the rear blade release position around the rear blade drive shaft.
A rear blade drive spring that urges the rear blade drive lever from the rear blade charge position to the rear blade release position.
A rear blade lever holding means that holds the rear blade drive lever at the rear blade charge position against the urging force of the rear blade drive spring.
The blade drive device according to any one of claims 1 to 5, further comprising a rear blade charge cam that abuts on the rear blade drive lever and moves the rear blade drive lever toward the rear blade charge position. .. The blade driving device according to claim 6, wherein the rear blade charge cam is formed on the composite cam member. The blade drive device according to any one of claims 1 to 7.
An image pickup device including an image pickup element arranged on a surface on which light transmitted through the opening of the frame body of the blade drive device is imaged.

Images