JP2014228709A - Shutter device, image-capturing device, and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shutter device capable of promptly suppressing the bound of a rear curtain when shading is released.SOLUTION: The shutter device has: a shutter bottom plate in which an opening is formed through which a photographic beam passes; a blade group for putting the opening into a closed state and an open state; a blade actuation member, with the blade group attached thereto, for actuating the blade group by rotating itself; a first urging member for urging the blade actuation member so that the blade group puts the opening into the open state; a blade drive member for driving the blade actuation member so that the blade group puts the opening into the closed state; a second urging member for urging the blade drive member so that the blade group puts the opening into the closed state; and a charge member for charging the second urging member. A first salient is formed in the blade actuation member, and a second salient is formed in the blade drive member. The blade actuation member contacts the blade drive member after the first salient formed in the blade actuation member climbs over the second salient formed in the blade drive member.

Description

  The present invention relates to a shutter device, an imaging device, and a camera system.

  2. Description of the Related Art Conventionally, a so-called double light-shielding shutter or a shutter using a combination of a front curtain and a rear blade of an electronic shutter without a front blade is known. In those shutters, if the blades at the time of releasing the double light shielding bounce, there are problems that the exposure abnormality and the release time lag cannot be shortened.

  In Patent Document 1, a shutter member is provided with a brake member. When the light is blocked, the blade actuating member is held in a light-shielded state by the brake member, and the brake member is bent by a charging operation by a charge lever to disengage the blade actuating member. Returning to the travel start standby state.

Japanese Patent No. 4290285

  However, in the double light-shielding shutter of Patent Document 1, the rear curtain itself must move to a position where the brake member is bent and held in the double light-shielding state when the rear curtain is running. That is, if the braking force is too strong to drive the trailing curtain, the trailing curtain cannot travel until the traveling complete state, which may cause a light shielding failure.

  Further, if the spring force is set to be strong so that the rear curtain running force can be overcome to overcome the force of the brake member, the charging force increases and the current consumption during charging increases.

  In addition, it is necessary to prepare a dedicated member for the brake, and a fixing means for the brake member such as a screw is also required, which increases the cost due to an increase in the number of parts.

  In view of such a problem, an object of the present invention is to provide a shutter device that can quickly suppress the trailing curtain bounce when canceling light shielding.

  A shutter device according to one aspect of the present invention is provided with a shutter base plate in which an opening through which a photographing light beam passes is formed, a blade group that closes and opens the opening, and the blade group is attached and rotated. A blade operating member that operates the blade group, a first biasing member that biases the blade operating member so that the blade group opens the opening, and the blade group opens the opening. A blade driving member that drives the blade actuating member to close the portion, a second biasing member that biases the blade driving member so that the blade group closes the opening, A charge member that charges the second urging member, the blade operating member is formed with a first convex portion, and the blade driving member is formed with a second convex portion, The first protrusion formed on the blade operating member is the wing. After getting over the second convex portion formed on the drive member, wherein said blade actuating member comes into contact with the blade driving member.

  According to the present invention, it is possible to provide a shutter device that can quickly suppress the trailing curtain bounce when the light shielding is canceled.

It is a center sectional view of a camera system concerning an embodiment of the present invention. It is a disassembled perspective view of a focal plane shutter. It is an enlarged view and sectional drawing of a blade drive member and a blade operation member. It is explanatory drawing of a cam gear. It is a figure which shows the operation timing of each component. It is a figure which shows the standby state before a release. It is a figure which shows a blade | wing operation member latch release state. It is explanatory drawing at the time of the collision of a blade | wing drive member and a blade | wing operation member. It is a figure which shows a mirror up state. It is a figure which shows the set cancellation | release state of a blade drive member. It is a figure which shows during blade | wing driving | running | working. It is a figure which shows a blade travel completion state. It is a figure which shows a mirror lever charge completion state. It is a figure which shows a blade | wing operation member latching state. It is a figure which shows the state during blade drive member charge.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a central sectional view of a camera system according to an embodiment of the present invention. The camera system includes a digital single-lens reflex camera main body (hereinafter simply referred to as a camera main body) 1 and an interchangeable lens (imaging optical system) 5.

  The interchangeable lens 5 that can be attached to and detached from the camera body 1 is fixed by a mount portion 11 on the camera body 1 side and a mount portion 51 on the interchangeable lens 5 side. When the interchangeable lens 5 is attached to the camera body 1, the contact portion 12 of the camera body 1 and the contact portion 52 of the interchangeable lens 5 come into contact with each other. Thereby, electrical connection is made, and the camera body 1 detects that the interchangeable lens 2 is attached. Further, power supply from the camera body 1 to the interchangeable lens 2 and communication for controlling the interchangeable lens 5 are performed via these contact portions.

  The light beam that has passed through the taking lens (shooting optical system) 53 of the interchangeable lens 5 enters the main mirror (mirror member) 13 of the camera body 1. The main mirror 13 is fixed to the main mirror holding frame 16, and is rotatably supported by a mirror box (not shown) by a rotating shaft portion 13a. The main mirror 13 is a down position that is held at an angle of 45 ° with respect to the photographic optical axis in order to guide the photographic light beam in the direction of the pentaprism 19 and a position that is retracted from the photographic light beam in order to guide it in the direction of the image sensor 23 It rotates between the up position held by the.

  The main mirror 13 is a half mirror, and the light beam transmitted through the main mirror 13 is reflected downward by the sub mirror 14 and guided to the focus detection unit 15. The sub mirror 14 is fixed to the sub mirror holding frame 17. The sub mirror holding frame 17 is pivotally supported with respect to the main mirror holding frame 16 by a hinge shaft (not shown). The focus detection unit 15 detects the defocus amount of the photographic lens 53 and calculates a lens driving amount for moving the photographic lens 53 so that the photographic lens 53 is in focus. Then, when the calculated lens driving amount is sent to the interchangeable lens 5 via the contact portion 12 and the contact portion 52, the interchangeable lens 2 controls a motor (not shown), and the focus lens which is a part of the photographing lens 53 is controlled. The focus is adjusted by moving it.

  The light beam that has passed through the photographing lens 53 is reflected by the main mirror 13 and guided to the viewfinder. The light beam guided to the finder by the main mirror 13 forms a subject image on the focus plate 18. The user is configured to observe the subject image on the focusing screen 18 via the pentaprism 19 and the eyepiece 20.

  A focal plane shutter (shutter device) 10 is disposed behind the sub mirror 14. The blade group of the focal plane shutter 10 is normally closed. An optical low-pass filter 21 is disposed behind the focal plane shutter 10. At the time of shooting, the light beam that has passed through the optical low-pass filter 21 enters the image sensor 23. The image sensor holder 22 is fixed to the housing of the camera body 1 with screws (not shown). The image sensor 23 is held by an image sensor holder 22. The cover member 24 protects the image sensor 23. The rubber member 25 holds the optical low-pass filter 21 and seals between the optical low-pass filter 21 and the image sensor 23.

  FIG. 2 is an exploded perspective view of the focal plane shutter 10. 2A is an exploded perspective view seen from the subject side, and FIG. 2B is an exploded perspective view seen from the user side.

  An opening 101 a is formed at the center of the shutter base plate 101.

  A blade driving member 111, a blade operating member 115, and a ratchet 116 are rotatably attached to a shaft 101b provided on the shutter base plate 101. Therefore, the blade driving member 111 and the blade operating member 115 are configured to be rotatable relative to the shaft 101b of the shutter base plate 101.

  A first cam gear (locking member) 121 is rotatably attached to a shaft 101 c provided on the shutter base plate 101.

  A second cam gear (charge member) 122, which is a set member, is rotatably attached to a shaft 101d provided on the shutter base plate 101.

  An auxiliary ground plate 131 is attached to the shafts 101b, 101c, and 101d. A buffer member 103 made of a material such as a half-moon-shaped rubber is fixed to an upper portion of an arc-shaped hole 101 e formed in the shutter base plate 101.

  A mirror lever 136 is rotatably attached to a shaft 131 a provided on the auxiliary base plate 131. A screw 137 is fixed to the tip of the shaft 131a so that the mirror lever 136 does not fall off the shaft 131a.

  The mirror lever 136 is provided with a cam follower 136a and a contact portion 136b. The cam follower 136a is in contact with a first cam 122a of a second cam gear 122 described later. The contact portion 136b is in contact with the main mirror drive pin 13b from the middle of the main mirror 13 up to the up state. Since the mirror lever drive spring 139 is attached to the mirror lever 136, the mirror lever 136 is urged clockwise around the rotation shaft portion 13a in FIG.

  A main mirror drive spring 107 is applied to the rotation shaft portion 13 a of the main mirror 13. Therefore, in FIG. 2A, the main mirror 13 is biased counterclockwise, that is, in the down direction, around the rotation shaft portion 13a.

  A photo sensor 132 that detects the rotational position of the blade operating member 115 is attached to the auxiliary base plate 131. In addition, a yoke 133 and a coil 134 are fixed to the auxiliary ground plate 131 with screws 135. The yoke 133 and the coil 134 constitute electromagnetic means, and a magnetic force is generated in the yoke 133 by applying a voltage to the coil 134.

  A flexible printed circuit board (hereinafter simply referred to as FPC) 138 is connected to the coil 134 and the photosensor 132 through a contact portion 138 a fixed to the auxiliary base plate 131. The contact portion 138b fixed to the shutter base plate 101 is provided with a phase pattern portion 138c for detecting the position of a phase contact piece 123 provided on a first cam gear 121 described later.

  A cover plate 102 is fixed to the user side of the shutter base plate 101. An opening 102 a is provided at the center of the cover plate 102 at a position substantially coincident with the opening 101 a of the shutter base plate 101. A blade chamber in which the blade group is arranged is formed between the shutter base plate 101 and the cover plate 102, and the light beam passing through the shutter is limited by opening and closing the two opening portions of the blade group. ing.

  The blade group includes a first blade 141, a second blade 142, a main arm 143, and a sub arm 144.

  The first blade 141 and the second blade 142 are made of polyethylene terephthalate containing a black paint. Further, the first blade 141 and the second blade 142 are rotatably attached to the main arm 143 and the sub arm 144 by a pin 145 to form a parallel link.

  The main arm 143 is rotatably attached to a shaft 101f provided on the shutter base plate 101. Further, the main arm 143 has a hole 143a for engaging with a blade driving pin 115a provided on the blade operating member 115. The blade driving pin 115a passes through the arc-shaped hole 101e of the shutter base plate 101, engages with the hole 143a of the main arm 143 on the user side of the shutter base plate 101, and transmits the rotation of the blade operating member 115 to the main arm 143. .

  The sub arm 144 is rotatably attached to a shaft 101g provided on the shutter base plate 101. Further, a blade return spring (first urging member) 146 is attached to the sub arm 144 in the clockwise direction in FIG.

  The blade cushioning member 104 and the blade contact member 105 constitute a stopper member. The blade cushioning member 104 is fixed to a rectangular mounting portion 101h provided on the shutter base plate 101, and is made of a rubber material such as chloroprene rubber, butyl rubber, polyurethane rubber, or silicon rubber, or a material that absorbs an impact such as an elastomer. Composed. The blade contact member 105 is made of a material such as metal or plastic, which has better wear resistance than the blade buffer member 104. The blade contact member 105 is fixed to the blade cushioning member 104, and prevents the blade cushioning member 104 from being worn by collision with the second blade 142.

  FIG. 3 is an enlarged view and a sectional view of the blade driving member 111 and the blade operating member 115. FIG. 3A is an enlarged view of the blade driving member 111 and the blade operating member 115 as viewed from the user side. 3B is a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 3B, the blade driving member 111 is provided with an armature holding portion 111 a, and the armature attached to be integrated with the armature 112 in the through hole 111 b formed in the armature holding portion 111 a. The shaft 112a is loosely inserted. At one end of the armature shaft 112a, a flange portion 112b having an outer diameter larger than the inner diameter of the through hole 111b is provided. A hemispherical protrusion 111c is provided at a position facing the flange 112b of the armature holding portion 111a. An armature spring 117, which is a compression spring, is attached around the armature shaft 112a between the armature 112 and the armature holding portion 111a. The armature spring 117 provides an urging force in a direction to separate the armature 112 from the armature holding portion 111a.

  As illustrated in FIG. 3C, the blade operating member 115 and the blade driving member 111 are rotatably attached to the shaft 101 b of the shutter base plate 101.

  The blade operating member 115 is provided with two light shielding members 115c. The light shielding member 115c shields the photo sensor 132 to detect the rotational position of the blade operating member 115.

  Between the ratchet 116 and the blade driving member 111, a blade driving spring (second urging member) 114 which is a torsion spring is disposed. One end of the blade driving spring 114 is attached to the blade driving member 111, and the other end is hung on the ratchet 116. The blade drive spring 114 applies a counterclockwise biasing force to the blade drive member 111 in FIG. The free length of the blade drive spring 114 is set longer than the distance between the blade drive member 111 and the ratchet 116. Therefore, the blade driving spring 114 works as a compression spring and urges the blade driving member 111 in the direction of the shutter base plate 101.

  A roller 113 is rotatably attached to the roller holding portion 111d of the blade driving member 111. The roller 113 is in contact with a second cam 122c of the second cam gear 122 described later.

  The blade operating member 115 is provided with a guide portion 115 d of the roller 113. In a range in which the blade driving member 111 and the blade operating member 115 operate, the guide portion 115d faces the roller 113 and prevents the roller 113 from coming off the roller holding portion 111d. Further, the guide portion 115 d is in a positional relationship parallel to the rotation direction of the blade driving member 111. Therefore, the guide portion 115 d functions as a rail of the roller 113 when the blade operating member 115 rotates relative to the blade driving member 111.

  The guide portion 115 d forms an inclined portion 115 f toward the shaft 101 b of the shutter base plate 101. In the case of the same thickness, the distance from the guide portion 115d to the shaft 101b is closer to the shortest path in the configuration incorporating the inclined portion than in the configuration including only the horizontal portion and the vertical portion. Therefore, the entire volume of the blade operating member 115 can be further reduced, and the rotational inertia can be reduced.

  Since the roller holding portion 111d of the blade driving member 111 is sandwiched between the blade operating members 115 in the depth direction of the paper surface of FIG. 3A, after assembly, the blade operating member 115, the blade driving member 111, and the roller 113 are integrated. Can be handled.

  In addition, the movable range of the blade driving member 111 in the depth direction of the paper surface between the blade operating members 115 is set to be equal to or less than the thickness of the roller 113. Therefore, even when the blade driving member 111 is loosely moved to either side, the roller 113 is unlikely to fall off the roller holding portion 111d. That is, it is possible to incorporate the roller 113 into the shutter base plate 101 while preventing the roller 113 from being detached from the roller holding portion 111d.

  FIG. 4 is an explanatory diagram of the first cam gear 121 and the second cam gear 122. FIG. 4A shows a locked state of the blade operating member 115, and FIG. 4B shows a locked state of the blade operating member 115.

  The first cam gear 121 is provided with a gear 121a and a cam 121b, and the second cam gear 122 is provided with a first cam 122a, a gear 122b, and a second cam 122c.

  The gear 122b engages with a transmission gear (not shown) to transmit the rotation of a motor (not shown). The gear 121a transmits rotation from the motor by engaging with the gear 122b. The number of teeth of the gear 121a and the gear region 122b is set to the same number, and the two gear regions are engaged with each other at a predetermined position. Therefore, the first cam gear 121 and the second cam gear 122 rotate at a predetermined position and at the same rotational speed.

  As shown in FIG. 4A, the cam 121 b comes into contact with the cam follower 115 e of the blade operating member 115, thereby preventing the blade operating member 115 from rotating. Further, as shown in FIG. 4B, the vane operating member 115 becomes rotatable as the cam 121b retreats from the rotation locus of the cam follower 115e.

  The phase pattern portion 138c of the FPC 138 detects the rotational position of the first cam gear 121 by making contact with the phase contact piece 123 provided on the lower surface of the cam 121b.

  The first cam 122a contacts the cam follower 136a of the mirror lever 136 and rotates the mirror lever 136 to the up position and the down position as will be described later.

  The second cam 122c is in contact with a roller 113 provided on the blade driving member 111, and performs charging and releasing operations of the blade driving member 111 as will be described later.

  Next, the operation of each component will be described. FIG. 5 shows the operation timing of each component. Note that the states A to L shown in FIG. 5 correspond to respective operation states described later.

  FIG. 6 is a diagram showing a standby state before release (state A shown in FIG. 5). 6A is a view as seen from the subject side, FIG. 6B is a view as seen from the user side, and FIG. 6C is an enlarged view of the blade driving member 111 as seen from the user side.

  The first cam gear 121 and the second cam gear 122 are stopped at the positions shown in FIG.

  The roller 113 attached to the blade driving member 111 is held by the cam top portion 122d of the second cam 122c of the second cam gear 122, and the blade driving member 111 drives the blade counterclockwise in FIG. The spring 114 is charged.

  As shown in FIG. 6C, the armature holding portion 111a of the blade driving member 111 compresses the armature spring 117, and the flange portion 112b of the armature 112 and the protruding portion 111c of the blade driving member 111 are separated from each other. The armature 112 is in contact with the yoke 133 (hereinafter referred to as an overcharge state).

  The cam follower 115e of the blade operating member 115 is in contact with the cam top 121c of the cam 121b of the first cam gear 121, and the blade operating member 115 is locked.

  The blade return spring 146 urges the sub arm 144 clockwise in FIG. 6B, but the blade operating member 115 is locked, so that the blade group resists the urging force of the blade return spring 146. Holds the expanded state. That is, the opening 101a of the shutter 101 is covered with a blade group.

  The mirror lever 136 is held in the down position because the cam follower 136a is locked by the cam top portion 122e of the first cam 122a of the second cam gear 122 by the biasing force of the mirror lever drive spring 139.

  The main mirror 13 is urged in the down direction by the main mirror drive spring 107 and is held in the down position by abutting against a stopper (not shown). At this time, there is a gap between the main mirror drive pin 13b of the main mirror 13 and the contact portion 136b of the mirror lever 136. Therefore, even if an error occurs in the position of the mirror lever 136, the position of the main mirror 13 is held at the correct position by the stopper.

  When the release operation is started, the coil 134 is energized to generate a magnetic force in the yoke 133, and the yoke 133 and the armature 112 are brought into an attracting state.

  At the same time, the motor is energized and the first cam gear 121 and the second cam gear 122 are rotated, so that the blade actuating member lock is released.

  FIG. 7 is a diagram illustrating a state in which the blade actuating member locking is released. 7A is a view seen from the subject side, FIG. 7B is a view seen from the user side, and FIG. 7C is an enlarged view of the blade driving member 111.

  When shifting to the state shown in FIG. 7, the cam 121b of the first cam gear 121 retracts from the rotation locus of the cam follower 115e of the blade operating member 115 (state B shown in FIG. 5). Therefore, the blade operating member 115 is released from the locked state and is rotatable with respect to the shaft 101 b of the shutter base plate 101.

  When the locking of the blade operating member 115 is released, the blade operating member 115 rotates clockwise in FIG. 6B by the biasing force of the blade return spring 146. With the rotation of the blade operating member 115, the blade group travels so as to open the opening 101a. At this time, the blade return spring 146 is biased in a direction opposite to the biasing direction of the blade driving spring 114 against the blade driving member 111. Therefore, the blade return spring 146 biases the main arm 143 with a weak biasing force so as not to increase the motor current when charging the blade driving member 111 against the biasing force of the blade driving spring 114. .

  After the blade group has traveled, the bounce of the blade buffer member 104 from the blade contact member 105 and the bounce suppression of the main arm 143 by the urging force of the blade return spring 146 continue. Therefore, a predetermined time is required until the bounce of the blade group converges.

  The blade group is overlapped after the bounce is converged, and the opening 101a of the shutter base plate 101 is in an open state.

  At this time, since the blade driving member 111 overcharges the blade driving spring 114, as shown in FIG. 7C, the blade driving member-side contact portion 111e of the blade driving member 111 and the blade operating member 115 There is a gap between the blade actuating member side contact portion 115b. Therefore, when the blade group travels, the blade driving member side contact portion 111e of the blade driving member 111 and the blade operation member side contact portion 115b of the blade operation member 115 do not contact each other.

  The second cam gear 122 rotates, but the cam follower 136a of the mirror lever 136 is locked by the cam top portion 122e of the first cam 122a of the second cam gear 122. Therefore, the main mirror 13 is in the down position while the blade group travels from the unfolded state to the superimposed state, and the light beam that has passed through the photographing lens 53 is guided to the pentaprism 19 by the main mirror 13 and is irradiated to the blade group. Absent.

  Here, the relationship between the blade driving member 111 and the blade operating member 115 will be described with reference to FIG. FIG. 8 is an explanatory diagram at the time of a collision between the blade driving member 111 and the blade operating member 115.

  FIG. 8A shows the positional relationship between the blade driving member 111 and the blade operating member 115 in the standby state before release.

  FIG. 8B shows the protrusion 115h provided on the tip side of the arm 115g of the blade operating member 115 and the blade driving member 111 when the blade operating member 115 is released from the standby state before the release. The slopes of the convex portions 111f are in contact with each other.

  FIG. 8 (c) shows a state in which the convex portion 115h has moved over the convex portion 111f after the slopes of the convex portion 115h and the convex portion 111f are in contact with each other when shifting from the standby state before the release to the blade operating member locking release state. Is shown.

  FIG. 8D shows the positional relationship between the blade drive member 111 and the blade operation member 115 immediately after the blade operation member lock release state. The blade operating member side contact portion 115b and the blade drive member side contact portion 111e contact each other.

  Normally, when the blade operating member 115 has moved from the standby state before the release to the blade operating member locking release state, the blade operating member 115 bounces.

  In this embodiment, the arm part 115g, the convex part 115h, and the convex part 111f function as a speed reduction mechanism that can reduce the traveling speed of the blade operating member 115. Since the projecting portions 115h and the projecting portions 111f project in a direction orthogonal to the rotational direction of the blade operating member 115, when the state transitions from the state shown in FIG. 8B to the state shown in FIG. The first convex portion 115h contacts the convex portion (second convex portion) 111f. When the convex portion 115h and the convex portion 111f come into contact with each other, the arm portion 115g is elastically deformed, so that the convex portion 115h gets over the convex portion 111f. That is, the speed of the blade operating member 115 is reduced by braking the rotation of the blade operating member 115. As a result, it is possible to shorten the bounce time of the blade operation member 115 when shifting from the standby state before the release to the blade operation member locking release state. Even if it bounces, as shown in FIG. 8C, the projection 111f and the projection 115h collide again, and the bounce can be minimized.

  Moreover, the surface where the convex part 111f contacts the convex part 115h has a plurality of curvatures k1 and k2 (k1 <k2). By having such a curvature, the click force when the blade operating member 115 gets over the convex portion 111f is made smooth so that it can get over smoothly.

  8A to 8D, the force for rotating the blade operating member 115 in the clockwise direction is due to the biasing force of the blade return spring 146 as described above. Therefore, the urging force of the blade return spring 146 is set so that the convex portion 111f and the convex portion 115h collide and the arm portion 115g can be elastically deformed.

  In the present embodiment, since the contact surface of the convex portion 111f has a plurality of curvatures, the blade operating member 115 can be easily moved from the standby state before the release to the blade operation locking member released state, and the reverse movement is performed. It is difficult to do. However, the same effect can be obtained even if the curvature of the convex portion 111f is not changed and the contact surface of the convex portion 115h has a plurality of curvatures. Further, on the respective contact surfaces of the projections 111f and 115h, even if the curvature of the surface that collides from the standby state before release to the release state of the blade actuating member is reduced and the curvature of other surfaces is increased. Similar effects can be obtained.

  Next, the shape of the arm portion 115g will be described with reference to FIGS. FIG. 8E is a view of FIG. 8D as viewed from below, and is an explanatory diagram regarding the relationship in the thickness direction of the arm portion 115g, the convex portion 115h, and the convex portion 111f of the blade operating member 115. FIG.

As shown in FIG. 8E, the thickness of the arm portion 115g is set to t _g2 > t _g1, and gradually decreases from the base end portion of the arm portion 115g toward the distal end portion. Further, as shown in FIG. 8D, the thickness of the arm portion 115g is set to t _g4 > t _g3 . By doing so, stress is prevented from being concentrated locally when the arm 115g is deformed. Further, the thickness t _h of the convex portion 115 _h that abuts on the convex portion 111 _f is set so that th _h > t _g 1. If the thickness t _h thin, because the contact area in contact with the convex portion 111f is likely wear narrowed. In addition, in the direction orthogonal to the rotation direction of the blade actuating member 115, it is experimentally shown that good results can be obtained when the overlap amount of the convex portion 115h and the convex portion 111f is set to 0.2 to 1.0 mm. It has been demanded.

  The first cam gear 121 and the second cam gear 122 are further rotated from the state where the blade actuating member locking is released. As the second cam gear 122 rotates, the cam follower 136a of the mirror lever 136 moves away from the cam surface of the first cam 122a of the second cam gear 122 (state C shown in FIG. 5).

  Further, when the first cam gear 121 and the second cam gear 122 are rotated, the mirror lever 136 is rotated by a predetermined amount by the urging force of the mirror lever drive spring 139, and then the contact portion 136b of the mirror lever 136 is moved to the main mirror drive pin. 13b. Thereafter, the main mirror 13 starts mirror-up driving (state D shown in FIG. 5).

  The main mirror 13 comes into contact with a stopper (not shown), stops after bouncing for a predetermined time, and accordingly, the mirror lever 136 stops at the up position, and enters the mirror up state which is the state of E shown in FIG. The mirror lever drive spring 139 has a strong biasing force in order to shorten the bounce time of the main mirror 13. For this reason, the main mirror 13 has a shorter bounce convergence time than the blade group.

  FIG. 9 is a diagram illustrating a mirror-up state. FIG. 9A is a diagram viewed from the subject side, and FIG. 9B is a diagram viewed from the user side.

  The main mirror 13 is in the up position, and the blade group travels downward and is superimposed, and the first blade 141 and the second blade 142 are in contact with the blade contact member 105 of the blade buffer member 104. Both the opening 101a of the shutter base plate 101 and the opening 102a of the cover plate 102 are open.

  The roller 113 attached to the blade driving member 111 is held by the cam top portion 122d of the cam 122c of the second cam gear 122, and the armature 112 and the yoke 133 are in an overcharged state. Therefore, there is a gap between the blade driving member side contact portion 111e and the blade operation member side contact portion 115b.

  When the motor is stopped in this state, a so-called live view state in which the light beam from the photographing lens 53 reaches the image sensor 23 is obtained. In the live view state, the blade group does not travel even when the coil 134 is turned off.

  The motor is driven from the state of FIG. 9, the first cam gear 121 and the second cam gear 122 are rotated, and the motor is stopped in the set release state that is the state of F shown in FIG.

  FIG. 10 is a diagram illustrating a set release state of the blade driving member 111. 10A is a view seen from the subject side, FIG. 10B is a view seen from the user side, FIG. 10C is an enlarged view of the blade driving member 111 of FIG. 10B, and FIG. d) is an enlarged view of the blade cushioning member 104. FIG.

  When the second cam gear 122 rotates from the state shown in FIG. 9, the holding of the roller 113 attached to the blade driving member 111 by the cam top portion 122d of the second cam 122c of the second cam gear 122 is released. Therefore, the blade driving member 111 rotates clockwise in FIG. 9A by the urging force of the blade driving spring 114.

  Since the coil 134 is energized, the armature 112 is attracted to the yoke 133 due to the magnetic force generated in the yoke 133. Further, the flange 112b of the armature 112 and the protrusion 111c of the blade driving member 111 are in contact with each other, and the blade driving member 111 is held.

  As the blade driving member 111 rotates, the blade driving member side contact portion 111e contacts the blade operation member side contact portion 115b as shown in FIG. Rotate clockwise.

  As the blade operating member 115 rotates, the blade group rises. A gap is generated between the first blade 141 and the second blade 142 and the blade contact member 105 of the blade cushioning member 104 as shown in FIG. At this time, the blade group is superposed, and the opening 101a of the shutter base plate 101 and the opening 102a of the cover plate 102 are both open.

  In the state of FIG. 10, reset scanning of the pixels of the image sensor 23 (hereinafter referred to as electronic front curtain travel) is performed, and photographing exposure is performed (state G in FIG. 5). The release time lag is from the release operation to the electronic front curtain travel. In the present embodiment, the mirror lever lock is released after the blade actuating member 115 is unlocked, and the bounce of the main mirror 13 converges within the convergence time of the bounce of the blade group, so the release time lag can be shortened. it can.

  After starting the electronic front curtain travel, the coil 134 is deenergized after a time interval corresponding to the set shutter speed.

  When the coil 134 is de-energized, the magnetic force generated in the yoke 133 is lost, and the adsorption of the armature 112 and the yoke 133 is released. Therefore, the blade driving member 111 is rotated clockwise in FIG. 10A by the biasing force of the blade driving spring 114.

  FIG. 11 is a diagram during blade traveling. FIG. 11A is a view seen from the subject side, and FIG. 11B is a view seen from the user side.

  During blade travel, the blade drive member side contact portion 111e rotates integrally with the blade operation member side contact portion 115b in contact with the blade operation member side contact portion 115b. During the rotation of the blade driving member 111, the blade driving member 111 and the blade operating member 115 come into contact with each other, so that the speed fluctuation of the blade driving member 111 does not occur, so the shutter accuracy does not deteriorate.

  The blade driving pin 115a of the blade operating member 115 engages with the hole 143a of the main arm 143, and rotates the main arm 143 counterclockwise in FIG. Therefore, the blade group travels upward in the figure against the urging force of the blade return spring 146.

  At this time, the roller 113 attached to the roller holding portion 111d of the blade driving member 111 maintains the relative position in the rotation direction with the guide portion 115d of the blade operating member 115, with the shaft 101b of the shutter base plate 101 as the center. Rotate clockwise in (a). Since no friction is generated between the roller 113 and the guide portion 115d, the influence of the change in the friction coefficient due to the lubricating oil used in the roller 113 oozes out or the thrust position of the roller 113 changes due to the posture change. Absent. Therefore, while preventing the roller 113 from coming off the roller holding portion 111d, friction between the roller 113 and the guide portion 115d is eliminated, and deterioration of shutter accuracy due to a change in contact resistance between the roller 113 and other members is minimized. It can be suppressed.

  FIG. 12 is a diagram illustrating a blade travel completion state that is the state of H illustrated in FIG. 5. 12A is a diagram viewed from the subject side, and FIG. 12B is a diagram viewed from the user side.

  The blade driving pin 115a of the blade operating member 115 is in contact with the buffer member 103 above the arcuate hole 101e of the shutter base plate 101 and is stopped.

  The blade operating member 115 is urged counterclockwise in FIG. 12A via the main arm 143 by the urging force of the blade return spring 146, and the blade operating member side contact portion 115b is contacted with the blade driving member side. The portion 111e remains in contact.

  The cam 121b of the first cam gear 121 is not in contact with the cam follower 115e of the blade operating member 115, and the blade operating member 115 is rotatable with respect to the shaft 101c.

  Whether or not the blade driving member 111 is in the blade traveling completion state is detected by a photo sensor 132 provided on the auxiliary base plate 131. After the photosensor 132 detects that the blade driving member 111 is in a state where the blade travel has been completed, the motor is energized after a predetermined time, and the first cam gear 121 and the second cam gear 122 are rotated (see I in FIG. 5). State).

  As the first cam gear 121 rotates, the first cam 122a of the second cam gear 122 pushes the cam follower 136a of the mirror lever 136, and the mirror lever 136 opposes the biasing force of the mirror lever drive spring 139 as shown in FIG. ) To rotate counterclockwise.

  The main mirror 13 is biased in the down direction by the main mirror drive spring 107, and rotates counterclockwise in FIG. 12A in a state where the rotating shaft portion 13a of the main mirror and the contact portion 136b of the mirror lever 136 are in contact. Rotates and descends.

  Further, by rotating the first cam gear 121 and the second cam gear 122, the mirror charge completion state, which is the state of J shown in FIG.

  FIG. 13 is a diagram illustrating a mirror lever charge completion state of the mirror lever 136. FIG. 13A is a view from the subject side, and FIG. 13B is a view from the user side.

  At this time, the cam follower 136a of the mirror lever 136 reaches the cam top portion 122e of the first cam 122a of the second cam gear 122, and the mirror lever 136 is held in the down position.

  Further, the first cam gear 121 and the second cam gear 122 are rotated to be in a state of K shown in FIG.

  FIG. 14 is a diagram illustrating a blade operating member locking state. FIG. 14A is a view from the subject side, and FIG. 14B is a view from the user side.

  The blade operating member 115 rotates by a predetermined amount counterclockwise in FIG. 14A through the main arm 143 by the biasing force of the blade return spring 146. When the cam follower 115e comes into contact with the cam top portion 121c of the cam 121b of the first cam gear 121, the blade operating member 115 stops rotating.

  At this time, the blade group descends as the blade actuating member 115 rotates, but remains in the deployed state. That is, both the opening 101a of the shutter base plate 101 and the opening 102a of the cover plate 102 remain shielded.

  Further, by rotating the first cam gear 121 and the second cam gear 122, the state of L shown in FIG.

  FIG. 15 is a diagram illustrating a state in which the blade driving member 111 is being charged. FIG. 15A is a view seen from the subject side, and FIG. 15B is a view seen from the user side.

  The second cam 122c of the second cam gear 122 pushes the roller 113 attached to the blade driving member 111, and the blade driving member 111 counterclockwise in FIG. 15A against the biasing force of the blade driving spring 114. Rotate to.

  When the blade driving member 111 rotates, the convex portion 115 h provided at the tip of the arm portion 115 g of the blade operating member 115 contacts the convex portion 111 f provided on the blade driving member 111. At that time, the arm portion 115g is elastically deformed, and the convex portion 115h rides on the convex portion 111f. Further, by rotating the first cam gear 121 and the second cam gear 122, the convex portion 115h gets over the convex portion 111f.

  When the roller 113 attached to the blade driving member 111 reaches the cam top portion 122d of the second cam 122c of the second cam gear 122, the blade driving member 111 is held against the urging force of the blade driving spring 114. .

  If the motor is deenergized in this state, a standby state before release, which is in state A shown in FIG.

  As described above, in the present embodiment, the bounce of the rear curtain at the time of canceling the light shielding can be quickly suppressed without adding any parts such as a brake member and without affecting the trailing curtain running characteristics. . Therefore, it is possible to shorten the release time lag and stabilize the in-screen exposure.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

10 Focal plane shutter (shutter device)
101 shutter base plate 101a opening 111 blade driving member 114 blade driving spring (second urging member)
115 Blade operating member 121 First cam gear (locking member)
122 Second cam gear (charge member)
141 1st blade 142 2nd blade 143 Main arm 144 Sub arm 146 Blade return spring (first urging member)

Claims (7)

A shutter base plate in which an opening through which a photographing light beam passes is formed;
A group of blades for closing and opening the opening;
A blade operating member that is attached to the blade group and rotates to operate the blade group, and
A first biasing member that biases the blade actuating member so that the blade group opens the opening.
A blade driving member that drives the blade operating member so that the blade group closes the opening; and
A second biasing member that biases the blade driving member so that the blade group closes the opening;
A charge member for charging the second urging member,
The blade operating member is formed with a first convex portion, and the blade driving member is formed with a second convex portion,
The blade operating member abuts on the blade driving member after the first convex portion formed on the blade operating member has overcome the second convex portion formed on the blade driving member. Shutter device. An arm is formed on the blade operating member,
The first convex portion is formed at a tip portion of the arm portion, and the arm portion is elastically deformed when the first convex portion gets over the second convex portion. The shutter device according to 1.   The shutter device according to claim 2, wherein the arm portion is narrowed from the proximal end portion toward the distal end portion. The first convex portion has a surface having a first curvature and a surface having a second curvature smaller than the first curvature,
4. The shutter device according to claim 1, wherein the first convex portion is in contact with the second convex portion on the surface of the first curvature. 5. The second convex portion has a surface having a first curvature and a surface having a second curvature smaller than the first curvature,
5. The shutter device according to claim 1, wherein the second convex portion is in contact with the first convex portion on the surface of the first curvature. 6.   An imaging device comprising the shutter device according to any one of claims 1 to 5. An imaging device according to claim 6;
An image pickup optical system that makes an image pickup light beam incident on the image pickup apparatus.