JP2012113114A - Shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a position where a shutter blade collides with a blade buffer member in consideration of production error and assembly error for sufficiently absorbing an impact with the blade buffer member.SOLUTION: A hole 4h is formed at a position eccentric from a center of a blade buffer member 4 such that a distance from a shaft 1h to a surface receiving an impact from a first blade 41 and a second blade 42 varies by changing the attachment direction of the blade buffer member.

Description

  The present invention relates to a shutter device.

  Conventionally, a focal plane shutter is provided with a blade cushioning member for suppressing the shutter blade from bouncing in the vicinity of the travel completion position of the shutter blade.

  When the shutter blades complete the travel, they collide with the blade cushioning member on the surface perpendicular to the traveling direction of the shutter blades, so that the impact caused by the sudden stoppage of the shutter blades is absorbed by the blade cushioning member. Can be suppressed. (See Patent Document 1).

JP 2008-058400 A

  However, in general, the focal plane shutter changes the travel end position of the shutter blades due to manufacturing errors or assembly errors of parts. Therefore, in order to sufficiently absorb the impact with the blade cushioning member, it is necessary to adjust the collision position of the shutter blade with the blade cushioning member in consideration of such an error.

  The shutter device disclosed in Patent Document 1 does not have such an adjustment mechanism. If the position at which the shutter blade collides with the blade cushioning member is not appropriate, the shutter blade cannot sufficiently absorb the shock, May be damaged. In addition, when an adjustment mechanism is provided, a dimension adjustment component is added, which leads to an increase in size and cost of the shutter device.

  In view of such a problem, an object of the present invention is to provide a shutter device capable of adjusting a position where a shutter blade collides with a blade cushioning member without adding a dimensioning component.

  In order to achieve the above object, a shutter device according to the present invention includes a shutter base plate in which an opening through which a photographing light beam passes is formed, a shutter blade that is moved to be in the closed state and an open state, and the shaft portion has the When the movement of the shutter blades is completed, the shutter device has a blade cushioning member that alleviates the impact acting on the shutter blades, and the shutter base plate has a shaft portion, and the blade cushioning member includes The blade cushioning member is attached to the shutter base plate by joining the shaft portion to the hole portion, and changing the mounting direction of the blade cushioning member, The front of the blade cushioning member is offset from the center of the blade cushioning member so that the distance from the shutter blade to the impact receiving surface changes. And forming a hole.

  ADVANTAGE OF THE INVENTION According to this invention, the shutter apparatus which can adjust the position where a shutter blade | wing collides with a blade | wing buffer member can be provided, without adding a wing adjustment part.

3 is an exploded perspective view of the shutter unit 100. FIG. It is a figure explaining the drive lever 11, the blade lever 15, and the ratchet 16. FIG. It is a figure explaining the state which assembled | attached the blade drive spring 14 and the ratchet 16 to the drive lever 11. FIG. It is a figure explaining the ratchet 16. FIG. It is a figure explaining the 1st cam gear 21 and the 2nd cam gear 22. FIG. 4 is a timing chart for explaining the operation timing of the mirror lever 36, the main mirror 6, the blade lever 15, the drive lever 11, the coil 34, the blade group, and the image sensor 116. It is a figure explaining the state of the shutter unit 100 in the standby state before a release. It is a figure explaining the state of the shutter unit 100 in a blade lever latch release state. It is a figure explaining the state of the shutter unit 100 in a mirror up live view state. It is a figure explaining the state of the shutter unit 100 in a set cancellation | release state. It is a figure explaining the state of the shutter unit 100 in a blade | wing driving | running | working state. It is a figure explaining the state of the shutter unit 100 in a blade travel completion state. It is a figure explaining the state of the shutter unit 100 in the mirror lever charge completion state. It is a figure explaining the state of the shutter unit 100 in a blade lever latchable state. It is a figure explaining the state of the shutter unit 100 in a drive lever charge state. It is a figure explaining the shape of the blade | wing buffer member 4 and the blade contact member 5. FIG. It is a figure explaining the attachment method to the axial part 1h of the blade | wing buffer member 4. FIG. It is a perspective view explaining the state which assembled | attached the blade contact member 105A and the blade contact member 105B to the blade buffer member 104. It is a figure explaining the attachment method to the axial part 1h of the blade | wing buffer member 4. FIG. 1 is a central cross-sectional view of a digital single-lens reflex camera body 101 and an interchangeable lens 201 as an imaging apparatus embodying the present invention.

  Hereinafter, with reference to FIGS. 1 to 20, a shutter device and an imaging device including the shutter device according to the present invention will be described.

  FIG. 20 is a central cross-sectional view of a digital single-lens reflex camera main body 101 and an interchangeable lens 201 as an imaging apparatus embodying the present invention.

  An interchangeable lens 201 that can be attached to and detached from the camera body 101 is fixed by a camera-side mount unit 102 and an interchangeable lens-side mount unit 202. When the interchangeable lens 201 is attached, the contact portion 103 of the camera body 101 and the contact portion 203 of the interchangeable lens 201 are electrically connected. Thereby, the camera body 101 detects that the interchangeable lens 201 is attached.

  Further, power supply from the camera body 101 to the interchangeable lens 201 and communication for controlling the interchangeable lens 201 are performed via the contact portions 103 and 203. The light beam that has passed through the focus lens 204 of the interchangeable lens 201 enters the main mirror 6 of the camera body 101. The main mirror 6 is a mirror capable of moving back and forth in the photographing optical path. The main mirror 6 is a half mirror, and the light beam reflected by the main mirror 6 is guided to the viewfinder.

  The light beam that has passed through the main mirror 6 is reflected downward by the sub mirror 105 and guided to the focus detection unit 106. The focus detection unit 106 detects the defocus amount of the focus lens 204 and calculates a lens driving amount for moving the focus lens 204 so that the focus lens 204 is in a focused state. When the calculated lens driving amount is sent to the interchangeable lens 201 via the contact portions 103 and 203, the interchangeable lens 201 controls a motor (not shown) to move the focus lens 204 to perform focus adjustment.

  The main mirror 6 is held by a main mirror holding frame 107 and is pivotally supported by a rotating shaft portion 6b. The sub mirror 105 is held by a sub mirror holding frame 109. The sub mirror holding frame 109 is pivotally supported with respect to the main mirror holding frame 107 by a hinge shaft (not shown). The light beam guided to the finder by the main mirror 6 forms a subject image on the focus plate 110. The user is configured to observe the subject image on the focus plate 110 via the pentaprism 111 and the eyepiece 112.

  A shutter unit 100 is disposed behind the sub mirror 105, and the blade group is normally closed. An optical low-pass filter 114 is disposed behind the shutter unit 100. Behind the optical low-pass filter 114, an image sensor 116 held by an image sensor holder 115 fixed to the housing by a screw (not shown) and a cover member 117 for protecting the image sensor 116 are arranged. A rubber member 118 holds the optical low-pass filter 114 and seals between the optical low-pass filter 114 and the image sensor 116. At the time of shooting, the light beam that has passed through the optical low-pass filter 114 is configured to enter the image sensor 116.

FIG. 1A is an exploded perspective view of the shutter unit 100 viewed from the front, and FIG. 1B is an exploded perspective view of the shutter unit 100 viewed from the back.
As shown in FIG. 1A, an opening 1 a is formed at the center of the shutter base plate 1. A shaft 1b, a shaft 1c, and a shaft 1d are formed on the shutter base plate 1. A drive lever 11, a blade lever 15, and a ratchet 16 are rotatably supported on the shaft 1b. A first cam gear 21 is rotatably supported on the shaft 1c. A second cam gear 22 is rotatably supported on the shaft 1d. The first cam gear 21 functions as a first member, and the second cam gear 22 functions as a second member.

  The drive lever 11 and the ratchet 16 are supported on the shaft 1b, the first cam gear 21 is supported on the shaft 1c, the second cam gear 22 is supported on the shaft 1d, and the auxiliary base plate 31 is fixed to the shutter base plate 1. To do. The blade lever 15 is pivotally supported by the drive lever 11, and rotates around the shaft 1 b in the same manner as the drive lever 11. The auxiliary base plate 31 is formed with bearing holes into which the shaft 1b, the shaft 1c, and the shaft 1d are inserted. The drive lever 11, the blade lever 15, the ratchet 16, the first cam gear 21 and the second cam gear 22 are sandwiched between the shutter base plate 1 and the auxiliary base plate 31.

  A shaft 31 a is formed on the auxiliary base plate 31. A mirror lever 36 is rotatably supported on the shaft 31a. A mirror lever drive spring 39 is applied to the mirror lever 36. The mirror lever drive spring 39 urges the mirror lever 36 clockwise in FIG. 1A, that is, the direction in which the main mirror 6 is raised.

  The main mirror 6 reciprocates around the rotation shaft 6b. As a result, the photographic light beam is held in 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 111, and in a position that is retracted from the photographic light beam in order to guide it in the direction of the image sensor 116. Can be taken up position.

  A main mirror drive spring 7 is applied to the shaft portion 6 a of the main mirror 6. The main mirror drive spring 7 biases the main mirror 6 in the down direction.

  The ratchet 16 has ratchet teeth 16a. The auxiliary base plate 31 is formed with an engaging claw portion 31b as an engaging member that engages with the ratchet teeth 16a.

  A photo sensor 32 that detects the rotational position of the blade lever 15 is attached to the auxiliary base plate 31.

  As shown in FIG. 1B, the yoke 33 and the coil 34 are fixed to the auxiliary base plate 31 by screws 35. By applying a voltage to the coil 34, a magnetic force is generated in the yoke 33.

  As shown in FIG. 1A, the flexible wiring board 38 is formed with a first fixing portion 38 a to which the auxiliary base plate 31 is fixed and a second fixing portion 38 b to be fixed to the shutter base plate 1. The flexible wiring board 38 is connected to the coil 34 and the photosensor 32 at the first fixing portion 38a. A phase pattern portion 38 c for detecting the phase of the phase contact piece 23 attached to the first cam gear 21 is formed in the second fixed portion 38 b of the flexible wiring board 38.

  A half-moon-shaped buffer member 3 made of an elastic material such as rubber is fixed to the upper part of the arc-shaped hole 1e of the shutter base plate 1.

  As illustrated in FIG. 1B, the cover plate 2 is fixed to the back side of the shutter base plate 1. An opening 2a is formed in the center of the cover plate 2 at a position substantially coincident with the opening 1a of the shutter base plate 1, and the light flux passing through the shutter unit 100 is restricted by the openings 1a and 2a.

  A blade chamber in which a blade group is arranged is formed between the shutter base plate 1 and the cover plate 2. The blade group includes first blade 41, second blade 42, main arm 43, and sub arm 44.

  The first blade 41 and the second blade 42 as shutter blades are made of polyethylene terephthalate containing black paint. The first blade 41 is rotatably supported by the main arm 43 and the sub arm 44 by the pin 45, and the second blade 42 is rotatably supported by the main arm 43 and the sub arm 44 by the pin 45.

  The main arm 43 is rotatably supported on a shaft 1 f formed on the shutter base plate 1, and the sub arm 44 is rotatably supported on a shaft 1 g formed on the shutter base plate 1. As the main arm 43 rotates about the shaft 1f and the sub arm 44 rotates about the shaft 1g, the first blade 41 and the second blade 42 perform parallel link motion.

  The main arm 43 is formed with a hole 43a for engaging with an engaging portion 15a of the blade lever 15 described later. The blade lever 15 functions as a blade lever connected to the first blade 41 and the second blade 42. A blade return spring 46 is applied to the sub arm 44. The blade return spring 46 urges the sub arm 44 in the clockwise direction in FIG. That is, the first blade 41 and the second blade 42 travel in the direction of opening the openings 1a and 2a by the urging force of the blade return spring 46.

  When the first blade 41 and the second blade 42 have finished traveling in the direction of opening the openings 1a and 2a by the urging force of the blade return spring 46, the first blade 41 and the second blade 42 collide with the blade cushioning member 4. The blade cushioning member 4 is fixed to a rectangular shaft portion 1 h provided on the shutter base plate 1. The blade cushioning member 4 has a rectangular outer shape, and the shaft portion 1 h is also formed in the same square as the outer shape of the blade cushioning member 4. Then, in a state where the blade cushioning member 4 is attached to the shutter base plate 1, the outer side of the blade cushioning member 4 and the side of the shaft portion 1 h are formed to be substantially parallel. In the present embodiment, the blade cushioning member 4 and the shaft portion 1h are quadrangular, but the same effects can be obtained as long as the polygon satisfies the above-described conditions.

  The blade cushioning member 4 is formed 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. The blade buffer member 4 is covered with a blade contact member 5 around the blade buffer member 4. The blade contact member 5 is made of a material having higher wear resistance than the blade cushioning member 4 such as metal or plastic. The blade contact member 5 is fixed to the blade buffer member 4. When the first blade 41 and the second blade 42 collide with the blade cushioning member 4, the first blade 41 and the second blade 42 are configured not to directly contact the blade cushioning member 4. As a result, the first blade 41 and the second blade 42 collide against the blade cushioning member 4 to prevent the blade cushioning member 4 from being worn.

FIG. 2 is a diagram illustrating the drive lever 11, the blade lever 15, and the ratchet 16.
2A and 2C are views of the drive lever 11, the blade lever 15, and the ratchet 16 as viewed from the shutter base plate 1 side.

  2B is a cross-sectional view taken along the line AA in FIG. 2A, and is a cross-sectional view of the armature holding portion 11a of the drive lever 11. FIG. FIG. 2D is a cross-sectional view taken along the line B-B in FIG. 2C, illustrating the relationship between the roller holding shaft 11 d of the drive lever 11 and the roller receiving portion 15 d of the blade lever 15.

  As illustrated in FIGS. 2A and 2C, the drive lever 11 has a protrusion 11 e and the blade lever 15 has a protrusion 15 b. In the state illustrated in FIG. 2A, the protruding portion 11e contacts the protruding portion 15b, and in the state illustrated in FIG. 2C, the protruding portion 11e does not contact the protruding portion 15b.

  As shown in FIG. 2B, the drive lever 11 is formed with an armature holding portion 11a. A through hole 11b is formed in the armature holding portion 11a. A flange 12b having an outer diameter larger than the inner diameter of the through hole 11b is provided at one end of the armature shaft 12a. The other end of the armature shaft 12a is loosely inserted into the through hole 11b, and after the armature 12 is attached to the armature shaft 12a, the other end of the armature shaft 12a is crimped.

  Between the armature 12 and the armature holding portion 11a, an armature spring 17 that is a compression spring is disposed around the armature shaft 12a. The armature spring 17 applies a biasing force in a direction to separate the armature 12 from the armature holding portion 11a.

  A hemispherical protrusion 11c is formed at a position facing the flange 12b of the armature holding portion 11a.

  As illustrated in FIGS. 2A, 2 </ b> C, and 2 </ b> D, a roller 13 is rotatably held on a roller holding shaft 11 d of the drive lever 11. Lubricating oil is applied between the roller holding shaft 11 d and the roller 13. The roller 13 is in contact with the second cam surface 22 c of the second cam gear 22.

  The drive lever 11 is formed with a protrusion 11e. The protruding portion 11 e contacts the protruding portion 15 b of the blade lever 15.

  The blade lever 15 is formed with a protruding engaging portion 15a. The engaging portion 15 a passes through the arc-shaped hole 1 e of the shutter base plate 1 and engages with the hole 43 a of the main arm 43 on the back side of the shutter base plate 1. Accordingly, the main arm 43 rotates in conjunction with the rotation of the blade lever 15. A cam follower 15 e is formed on the blade lever 15. The cam follower 15 e is in contact with the cam surface 21 b of the first cam gear 21. The blade lever 15 is provided with two light shielding wall portions 15c, and the light shielding wall portion 15c shields the photosensor 32 to detect the rotational position of the blade lever 15. That is, the photosensor 32 functions as a detection unit, and the light shielding wall portion 15c functions as a detected portion.

  The blade lever 15 is formed with a roller receiving portion 15d extending toward the roller holding shaft 11d so that the roller 13 held by the roller holding shaft 11d does not fall off.

  The roller receiving portion 15d is within a range in which the roller holding shaft 11d moves when the blade lever 15 is driven in the direction in which the first blade 41 and the second blade 42 open the openings 1a and 2a by the urging force of the blade return spring 46. It is formed.

  That is, regardless of the positional relationship between the drive lever 11 and the blade lever 15, the roller receiving portion 15d faces the roller holding shaft 11d. Therefore, even if the lubricating oil applied between the roller holding shaft 11d and the roller 13 starts to ooze, it only adheres to the roller receiving portion 15d and does not ooze out to the shutter base plate 1.

  As shown in FIG. 2D, the drive lever 11 is pivotable with respect to the shaft 1 b of the shutter base plate 1 by engaging the cylindrical portion 11 f of the drive lever 11 with the shaft 1 b of the shutter base plate 1. Be supported. The blade lever 15 is pivotally supported with respect to the cylindrical portion 11 f of the drive lever 11 by engaging the blade lever 15 with the cylindrical portion 11 f of the drive lever 11. Therefore, the blade lever 15 rotates with respect to the shutter base plate 1, and the drive lever 11 rotates with respect to the shutter base plate 1 on the same axis as the blade lever 15.

  As illustrated in FIG. 2D, a blade drive spring 14 that is a torsion spring is disposed between the ratchet 16 and the drive lever 11. One end 14 a of the blade drive spring 14 is locked to the drive lever 11, and the other end 14 b of the blade drive spring 14 is locked to the ratchet 16. The blade drive spring 14 urges the drive lever 11 counterclockwise in FIG. The free length of the blade drive spring 14 is set to be longer than the distance between the drive lever 11 and the ratchet 16 and acts as a compression spring to urge the drive lever 11 toward the shutter base plate 1.

  As shown in FIG. 2D, the blade lever 15 is formed with an inclined portion 15f. By forming the inclined portion 15 f, the roller receiving portion 15 d of the blade lever 15 extends from the rotation center of the blade lever 15 so as to have a substantially conical shape. When the roller receiving portion 15d is extended from the rotation center of the blade lever 15 so as to have a substantially cylindrical shape, the inertial force acting on the blade lever 15 increases when the blade lever 15 rotates. In this embodiment, by forming the roller receiving portion 15d in a substantially conical shape, it is possible to form the roller receiving portion 15d while suppressing an increase in the inertial force of the blade lever 15.

  A procedure for assembling the drive lever 11 to the blade lever 15 will be described. First, the roller 13 is inserted into the roller holding shaft 11d. Thereafter, the blade lever 15 is inserted into the cylindrical portion 11f in the state shown in FIG. Then, when the blade lever 15 is rotated counterclockwise with respect to the drive lever 11, the state illustrated in FIG. In the state illustrated in FIG. 2C, the roller holding shaft 11 d is positioned between the roller receiving portion 15 d and the light shielding wall portion 15 c, so that the drive lever 11 does not come out of the blade lever 15. Further, the range in which the roller holding shaft 11 d moves in the axial direction between the roller receiving portion 15 d and the light shielding wall portion 15 c is smaller than the thickness of the roller 13. Therefore, the roller 13 does not fall off from the roller holding shaft 11d.

  In this way, the drive lever 11, the roller 13, and the blade lever 15 are integrated, and the cylindrical portion 11 f of the drive lever 11 is engaged with the shaft 1 b of the shutter base plate 1.

  FIG. 3 is a diagram for explaining a state in which the blade drive spring 14 and the ratchet 16 are assembled to the drive lever 11. As shown in FIG. 3, one end 14 a of the blade drive spring 14 is locked to the drive lever 11, and the other end 14 b of the blade drive spring 14 is locked to a slit 16 b formed in the ratchet 16. The state shown in FIG. 3 is a free state in which the blade drive spring 14 is not charged. When the ratchet 16 is rotated clockwise from this state, the blade drive spring 14 is charged. In a state where the ratchet 16 is rotated and the blade drive spring 14 is charged, the engagement claw portion 31b formed on the auxiliary base plate 31 engages with the ratchet teeth 16a. By adjusting the rotation amount of the ratchet 16, the force with which the blade drive spring 14 biases the drive lever 11 is adjusted. That is, the ratchet 16 corresponds to a ratchet member.

  FIG. 4 is a view for explaining the ratchet 16. FIG. 4A is a view for explaining the appearance of the ratchet 16. As shown in FIG. 4A, the ratchet 16 has a double cylindrical shape formed by a first cylindrical portion 16c and a second cylindrical portion 16d. Ratchet teeth 16a are formed on the outer peripheral surface of the first cylindrical portion 16c. The second cylindrical portion 16d is a cylindrical portion that is concentric with the first cylindrical portion 16c, and is formed inside the first cylindrical portion 16c. A slit 16b that is partially cut away is formed in the first cylindrical portion 16c. At the end of the slit 16b, a protruding portion 16e is formed that protrudes from the inner peripheral surface of the first cylindrical portion 16c toward the second cylindrical portion 16d.

  Therefore, in the portion where the protruding portion 16e is formed, the radial thickness of the first cylindrical portion 16c is thicker than the other portions. A protruding portion 16f that protrudes toward the first cylindrical portion 16c is formed in a portion of the outer peripheral surface of the second cylindrical portion 16d where the slit 16b and the protruding portion 16e face each other.

  FIG. 4B shows a state in which the blade driving spring 14 is disposed between the first cylindrical portion 16c and the second cylindrical portion 16d, and the other end 14b of the blade driving spring 14 is locked to the slit 16b. ing. The state shown in FIG. 4B is a free state in which the blade drive spring 14 is not charged.

  As shown in FIG. 4B, the second angular position from the inner peripheral surface of the first cylindrical portion 16c is within a range in which the first angular position P1 is clockwise from the position P0 of the end portion 16b1 of the slit 16b. A protruding portion 16e that protrudes toward the cylindrical portion 16d is formed. That is, when the ratchet 16 is rotated in the direction in which the blade driving spring 14 is charged, the direction opposite to the direction in which the blade driving spring 14 is charged from the end 16b1 of the slit 16b with which the other end 14b of the blade driving spring 14 abuts. The protrusion 16e is formed in a range that becomes the first angular position. The thickness Ha of the end portion 16b1 of the slit 16b is larger than the thickness Hb of the end portion 16b2 of the slit 16b. The end 16b1 of the slit 16b corresponds to one end of the slit 16b, and the end 16b2 of the slit 16b corresponds to the other end of the slit 16b.

  Further, the slit 16b is formed so that the end portion 16b1 of the slit 16b is a tip portion of the ratchet tooth 16a. As a result, the area of the end 16b1 of the slit 16b can be maximized.

  When the ratchet 16 is rotated counterclockwise from the state shown in FIG. 4B, the one end 14a of the blade driving spring 14 comes into contact with the end 16b1 of the slit 16b and charges the blade driving spring 14. When the blade drive spring 14 is charged, the state shown in FIG.

  When charging the blade driving spring 14, a large force acts on the end 16b1 of the slit 16b. Although the ratchet 16 is formed of a resin material, the end portion 16b1 of the slit 16b has sufficient strength due to the formation of the protruding portion 16e. Thereby, when charging the blade driving spring 14, there is no problem that the one end 14a of the blade driving spring 14 is sunk into the end 16b1 of the slit 16b.

  As shown in FIG. 4C, the blade drive spring 14 is charged and the blade drive spring 14 is tightened, whereby the diameter of the blade drive spring 14 is changed from Da shown in FIG. 4B to FIG. 4C. Db shown in FIG. When the diameter of the blade drive spring 14 is reduced, it is conceivable that the range in which the one end 14a of the blade drive spring 14 contacts the end 16b1 of the slit 16b is reduced.

  Considering this point, if the one end 14a of the blade drive spring 14 is formed longer, the one end 14a of the blade drive spring 14 protrudes from the slit 16b when the charge amount of the blade drive spring 14 is small. In this case, parts cannot be laid out in the space where the one end 14a of the blade driving spring 14 may protrude, which hinders downsizing of the shutter device.

  On the other hand, in the present embodiment, in the outer peripheral surface of the second cylindrical portion 16d, in a range from the position P2 of the other end 16b2 of the slit 16b to the first angular position P1 where the protruding portion 16e is formed, A protruding portion 16f that protrudes toward the first cylindrical portion 16c is formed. As a result, the blade drive spring 14 is charged, and as shown in FIG. 4C, even if the diameter of the blade drive spring 14 is Db, one end 14a of the blade drive spring 14 is the end 16b1 of the slit 16b. It is possible to ensure a range in contact with. Accordingly, since the range in which the one end 14a of the blade drive spring 14 and the end 16b1 of the slit 16b abut is reduced, the one end 14a of the blade drive spring 14 is recessed into the end 16b1 of the slit 16b. Does not occur. In addition, it is not necessary to form the one end 14a of the blade drive spring 14 longer, and this does not hinder downsizing of the shutter device.

FIG. 5 is a diagram for explaining the first cam gear 21 and the second cam gear 22.
The first cam gear 21 is formed with a gear 21a and a cam 21b. The rotation of the gear 21a is transmitted by meshing with the gear 22b of the second cam gear 22. The gear 21a functions as a first gear portion, and the gear 22b functions as a second gear portion. The cam 21b is a cam traced by the cam follower 15e of the blade lever 15.

  In the state illustrated in FIG. 5A, the cam 21b and the cam follower 15e are in contact with each other. In this state, the blade lever 15 is applied with a counterclockwise force by the blade return spring 46, but the rotation of the blade lever 15 is prevented by the contact of the cam 21b and the cam follower 15e. Accordingly, the first cam gear 21 holds the blade lever 15 so that the first blade 41 and the second blade 42 close the openings 1a and 2a.

  The state illustrated in FIG. 5B shows a state in which the first cam gear 21 is rotated counterclockwise from the state illustrated in FIG. In the state shown in FIG. 5B, the contact between the cam 21 b and the cam follower 15 e is released, and the blade lever 15 is rotated counterclockwise by the blade return spring 46.

  When the first cam gear 21 rotates counterclockwise from the state shown in FIG. 5B, the cam 21b comes into contact with the cam follower 15e and rotates the blade lever 15 clockwise. As a result, the blade return spring 46 is charged.

  A phase contact piece 23 is disposed on the bottom surface of the cam portion 21b. The phase contact piece 23 comes into contact with the pattern portion 38 c of the FPC 38 and detects the rotational phase of the first cam gear 21.

  The second cam gear 22 is formed with a first cam 22a, a gear 22b, and a second cam 22c. The gear 22b meshes with a transmission gear (not shown), and a driving force of a motor (not shown) is transmitted.

  The number of teeth of the gear 22b and the gear 21a is set to the same number. The gear 22b and the gear 21a mesh with each other at a predetermined phase. Therefore, the first cam gear 21 and the second cam gear 22 rotate at a predetermined phase and at the same rotation speed.

The first cam 22a, which is the first cam portion, comes into contact with the cam follower 36a of the mirror lever 36 and rotates the mirror lever 36 to the up position and the down position. That is, the second cam gear 22 lowers the main mirror 6 and enters the imaging optical path when the first cam gear 22 is in the first position where the first cam 22a and the cam follower 36a of the mirror lever 36 come into contact with each other. The second cam gear 22 raises the main mirror 6 and retracts it from the photographing optical path when the second cam gear 22 is in the second position where the contact between the first cam 22a and the cam follower 36a of the mirror lever 36 is released.
The second cam 22c, which is the second cam portion, comes into contact with the roller 13 held by the drive lever 11, and performs the charge and release operations of the drive lever 11.

  FIG. 6 is a timing chart for explaining the operation timing of the mirror lever 36, the main mirror 6, the blade lever 15, the drive lever 11, the coil 34, the blade group, and the image sensor 116. The operation of the shutter unit 100 from the state A shown in FIG. 6 to the state M will be described with reference to FIGS.

  The state A shown in FIG. 6 is a standby state before release. FIG. 7 shows the state of the shutter unit 100 in the standby state before release. FIG. 7A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 7B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  In the standby state before the release, the first cam gear 21 and the second cam gear 22 are stopped at the positions shown in FIGS. 7A and 7B.

  The roller 13 held by the drive lever 11 is in contact with the cam top portion 22 d of the second cam 22 c of the second cam gear 22. The drive lever 11 is in a state where the blade drive spring 14 is overcharged. The state in which the blade drive spring 14 is overcharged means that when the coil 34 is energized, the yoke 33 moves beyond the position where the armature 12 can be held, and the drive lever 11 is moved in the direction in which the blade drive spring 14 is charged. It is the state made to do. As shown in FIG. 7C, in the overcharged state, the armature 12 is in contact with the yoke 33, but the armature holding portion 11a of the drive lever 11 compresses the armature spring 17, and the flange portion 12b of the armature 12 is shown. And the protrusion 11c of the blade driving member is separated.

  The cam follower 15 e of the blade lever 15 is in contact with the cam top 21 c of the cam 21 b of the first cam gear 21. Thereby, the blade lever 15 is locked in the state shown in the figure.

  In FIG. 7B, the blade return spring 46 urges the sub arm 44 in the clockwise direction, but the blade lever 15 is locked. Accordingly, the first blade 41 and the second blade 42 are held in a state in which the openings 1 a and 2 a are closed against the urging force of the blade return spring 46.

  At this time, the roller receiving portion 15d of the blade lever 15 is in a position facing the roller 13, and the roller 13 is prevented from falling off the roller holding shaft 11d.

  In the mirror lever 36, the cam follower 36a is in contact with the cam top portion 22e of the first cam 22a of the second cam gear 22, and the mirror lever drive spring 39 is charged as shown in FIG. keeping.

  The main mirror 6 is biased in the down direction by the main mirror driving spring 7. The main mirror 6 comes into contact with a stopper (not shown) and enters a mirror-down state. At this time, a gap is formed between the shaft portion 6 a of the main mirror 6 and the contact portion 36 b of the mirror lever 36. Therefore, even if an error occurs in the position of the mirror lever 36, the position of the main mirror 6 is positioned at a correct position by a stopper (not shown).

  When the release signal is input in the standby state before the release, the coil 34 is energized and the yoke 33 attracts the armature 12. At the same time, when the motor (not shown) is energized and the first cam gear 21 and the second cam gear 22 rotate, the blade lever locking release state B shown in FIG.

  The state of B shown in FIG. 6 is a blade lever locking release state. FIG. 8 shows the state of the shutter unit 100 in the blade lever locking release state. FIG. 8A is a diagram of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 8B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  In the blade lever locking release state, the first cam gear 21 and the second cam gear 22 are stopped at the positions illustrated in FIGS. 8A and 8B.

  Only portions that have changed from the standby state before release shown in FIG. 7 will be described, and descriptions of portions that have not changed from the standby state before release will be omitted.

  When the illustrated motor is energized, the first cam gear 21 rotates from the state illustrated in FIG. 7 to the state illustrated in FIG. When the first cam gear 21 is in the state shown in FIG. 8, the contact between the cam follower 15e of the blade lever 15 and the cam top 21c of the cam 21b of the first cam gear 21 is released. That is, the cam 21b is retracted from the turning locus of the cam follower 15e of the blade lever 15, the locking of the blade lever 15 is released, and the blade lever 15 is in a state of being rotatable with respect to the shaft 1b.

  When the lock of the blade lever 15 is released, the first blade 41 and the second blade 42 travel in the direction of opening the openings 1a and 2a by the biasing force of the blade return spring 46 biasing the sub arm 44. Then, following this, the blade lever 15 also rotates with respect to the shaft 1b.

  At this time, the roller 13 attached to the roller holding shaft 11d of the drive lever 11 moves along the roller receiving portion 15d of the blade lever 15 so as not to be detached from the roller holding shaft 11d.

  In the blade lever locking release state, as shown in FIGS. 8A and 8B, the first blade 41 and the second blade 42 travel in the direction of opening the openings 1a and 2a, and then the first blade 41 and The second blade 42 overlaps with the blade cushioning member 4. The blade cushioning member 4 alleviates the impact acting on the first blade 41 and the second blade 42 when the movement of the first blade 41 and the second blade 42 is completed.

  The periphery of the blade cushioning member 4 is covered with a blade contact member 5. That is, when the first blade 41 and the second blade 42 are overlapped and collide with the blade buffer member 4, the blade contact member 5 has a blade group including the first blade 41 and the second blade 42 and the blade buffer member. 4 between. The blade contact member 5 is made of a material having higher wear resistance than the blade cushioning member 4.

  When the first blade 41 and the second blade 42 collide with the blade buffer member 4, the first blade 41 and the second blade 42 do not directly contact the blade buffer member 4 but directly contact the blade contact member 5. Since the blade contact member 5 is formed of a material having high wear resistance such as metal, even if the first blade 41 and the second blade 42 are in direct contact, wear powder or the like is hardly generated. In addition, since the blade cushioning member 4 is not in direct contact with the first blade 41 and the second blade 42, a material having high shock absorbing performance can be used even if wear powder or the like is easily generated.

  8A and 8B, when the first blade 41 and the second blade 42 come into contact with the blade contact member 5, the drive lever 11 protrudes as shown in FIG. 8C. A gap is formed between the portion 11e and the protruding portion 15b of the blade lever 15. The drive lever 11 is in a state where the blade drive spring 14 is overcharged as shown in FIG.

  In this state, even if the first blade 41 and the second blade 42 are caused to travel in the opening direction by the urging force of the blade return spring 46, the blade lever 15 does not contact the drive lever 11. Therefore, the impact when the first blade 41 and the second blade 42 travel in the opening direction by the urging force of the blade return spring 46 is not transmitted to the drive lever 11. When the blade drive spring 14 is overcharged, the drive lever 11 presses the armature 12 against the yoke 33. If an impact is applied to the drive lever 11 at this time, the armature 12 and the suction surface of the yoke 33 are damaged. Although damage to the suction surfaces of the armature 12 and the yoke 33 leads to a reduction in exposure accuracy, in this embodiment, damage to the suction surfaces of the armature 12 and the yoke 33 can be avoided.

  When the first blade 41 and the second blade 42 are moved in the opening direction by the urging force of the blade return spring 46 and brought into contact with the blade contact member 5, the first blade 41 and the second blade 42 are illustrated in FIG. To bounce.

  When the blade lever locking state is released from the standby state before the release, the second cam gear 22 also rotates as the first cam gear 21 rotates. In the second cam gear 22, as shown in FIG. 8A, the cam follower 36a of the mirror lever 36 is in contact with the cam top portion 22e of the first cam 22a of the second cam gear 22. Therefore, the mirror lever 36 is held in a state in which the mirror lever drive spring 39 is charged, similarly to the state shown in FIG.

  Similarly to the state shown in FIG. 7A, the main mirror 6 is also biased in the down direction by the main mirror drive spring 7, and comes into contact with a stopper (not shown) to enter the mirror down state. That is, the first blade 41 and the second blade 42 open the openings 1a and 2a, but the main mirror 6 remains in the mirror-down state.

  When energization of the motor is continued, the first cam gear 21 and the second cam gear 22 are rotated to enter the C mirror lever lock release state shown in FIG.

  The state C shown in FIG. 6 is a mirror lever lock release state. The first cam gear 21 and the second cam gear 22 further rotate from the state shown in FIG. By the rotation of the second cam gear 22, the contact between the cam follower 36a of the mirror lever 36 and the first cam 22a of the second cam gear 22 is released. When the first cam 22a is retracted from the turning locus of the cam follower 36a, the locking of the mirror lever 36 is released, and the mirror lever 36 is rotated clockwise in FIG. 8A by the urging force of the mirror lever driving spring 39. Rotate.

  There is a gap between the shaft portion 6a of the main mirror 6 and the contact portion 36b of the mirror lever 36 in the standby state before the release. Therefore, after the mirror lever 36 is rotated clockwise in FIG. 8A by this gap, the contact portion 36 b of the mirror lever 36 contacts the shaft portion 6 a of the main mirror 6. When the contact portion 36b of the mirror lever 36 contacts the shaft portion 6a of the main mirror 6, the state D shown in FIG. 6 becomes the mirror lever contact state.

  The state D shown in FIG. 6 is a mirror lever contact state. In this state, the contact portion 36 b of the mirror lever 36 contacts the shaft portion 6 a of the main mirror 6, and the mirror lever 36 rotates the main mirror 6 against the urging force of the main mirror drive spring 7 in the up direction. It is a state that starts moving.

  When the main mirror 6 comes into contact with a stopper (not shown), the main mirror 6 bounces and stops at the up position as shown in FIG. The mirror lever drive spring 39 has a relatively strong spring force in order to shorten the bounce time of the main mirror 6. Therefore, the bounce time of the main mirror 6 is shorter than the bounce time of the first blade 41 and the second blade 42 in the blade lever locking release state. When the bounce of the main mirror 6 converges, the mirror up live view state of E shown in FIG.

  The state E shown in FIG. 6 is a mirror up live view state. FIG. 9 shows the state of the shutter unit 100 in the mirror-up live view state. FIG. 9A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 9B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  In the mirror-up live view state, the first cam gear 21 and the second cam gear 22 are stopped at the positions illustrated in FIGS. 9A and 9B.

  The drive lever 11 and the blade lever 15 are the same as shown in FIGS. 8 (a) and 8 (b). That is, the first blade 41 and the second blade 42 open the openings 1 a and 2 a and are in contact with the blade contact member 5. Even in the mirror-up live view state, the roller 13 held by the drive lever 11 is in contact with the cam top portion 22d of the second cam 22c of the second cam gear 22, so the blade drive spring 14 is overcharged. It is in a state. Therefore, even in the mirror-up live view state, a gap is formed between the protruding portion 11e of the drive lever 11 and the protruding portion 15b of the blade lever 15 as illustrated in FIG.

  Further, as described above, the contact between the cam follower 36a of the mirror lever 36 and the first cam 22a of the second cam gear 22 is released, and the mirror lever 36 is rotated by the biasing force of the mirror lever drive spring 39. . The mirror lever 36 rotates the main mirror 6 in the up direction against the urging force of the main mirror drive spring 7.

  When a motor (not shown) is stopped in this state, a light beam from the interchangeable lens 201 reaches the image sensor 116, and a so-called live view state is displayed in which a subject image captured by the image sensor 116 is displayed on a display monitor.

  In the mirror up live view state, the roller 13 held by the drive lever 11 is in contact with the cam top portion 22 d of the second cam 22 c of the second cam gear 22. Therefore, even if the coil 34 is de-energized, the first blade 41 and the second blade 42 remain open in the openings 1a and 2a.

  In the mirror up live view state, the motor is energized, the first cam gear 21 and the second cam gear 22 are rotated, and the motor is stopped in the F set release state shown in FIG.

  The state F shown in FIG. 6 is a set release state. FIG. 10 shows the state of the shutter unit 100 in the set release state. FIG. 10A is a diagram of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 10B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  In the set release state, the first cam gear 21 and the second cam gear 22 are stopped at the positions shown in FIGS. 10 (a) and 10 (b).

  In the set release state, the second cam gear 22 rotates, so that the contact between the roller 13 held by the drive lever 11 and the cam top portion 22d of the second cam 22c of the second cam gear 22 is released. . As a result, the drive lever 11 is rotated in the clockwise direction in FIG. 10A by the urging force of the blade drive spring 14, and the state in which the blade drive spring 14 is overcharged is released. Even if the contact between the roller 13 and the cam top portion 22d of the second cam 22c is released, the coil 34 is energized, so the armature 12 is attracted to the yoke 33 and the first blade 41 and the second blade 42 are energized. Maintains the opening 1a and 2a open.

  When the overcharged state of the blade drive spring 14 is released, the flange portion 12b of the armature 12 and the projection portion 11c of the blade drive member come into contact with each other due to the biasing force of the armature spring 17. As a result, as shown in FIG. 10C, the drive lever 11 is slightly rotated so that the protrusion 11 e of the drive lever 11 contacts the protrusion 15 b of the blade lever 15. Then, as illustrated in FIG. 10D, the first blade 41 and the second blade 42 come into contact with the blade contact member 5 when the projecting portion 11 e of the drive lever 11 presses the projecting portion 15 b of the blade lever 15. It will be in a state that does not.

  That is, when the blade drive spring 14 is overcharged and the coil 34 is energized, the yoke 33 attracts the armature 12 until the blade drive spring 14 is released from the overcharge state. Contacts the drive lever 11.

  In the set release state, the main mirror 6 is stopped at the up position as in the mirror up live view state.

  As shown in FIG. 6, the photographing exposure operation is started by performing reset scanning (hereinafter referred to as electronic front curtain travel) of the pixels of the image sensor 116 in the set release state. There is a release time lag from when the release signal is input to when the electronic front curtain travels. In this embodiment, the opening operation of the first blade 41 and the second blade 42 with a relatively long bounce time is started before the up operation of the main mirror 6 with a relatively short bounce time. When the opening operation of the first blade 41 and the second blade 42 and the up operation of the main mirror 6 are started at the same time, even if the bounce of the main mirror 6 converges, the bounce of the first blade 41 and the second blade 42 converges. If you don't wait, you can't run the electronic front curtain. Therefore, the release time lag becomes long. In this embodiment, in view of this point, after the opening operation of the first blade 41 and the second blade 42 is started, the up operation of the main mirror 6 is started.

  Further, by starting the opening operation of the main mirror 6 after starting the opening operation of the first blade 41 and the second blade 42, there is a possibility that the first blade 41 and the second blade 42 are irradiated with direct sunlight. Lower. Thereby, even if the 1st blade | wing 41 and the 2nd blade | wing 42 are formed with the polyethylene terephthalate containing a black coating material, the damage by irradiation of direct sunlight can be reduced.

  After the electronic front curtain travel is started, a time interval corresponding to the set shutter time is set, and then the coil 34 is turned off, so that the G blade travel state shown in FIG.

  The state G shown in FIG. 6 is a blade traveling state. FIG. 11 shows the state of the shutter unit 100 in the blade traveling state. FIG. 11A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 11B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  As shown in FIGS. 11A and 11B, when the coil 34 is de-energized, the first blade 41 and the second blade 42 cannot maintain the state of opening the openings 1a and 2a.

  The drive lever 11 is rotated by the urging force of the blade drive spring 14 as shown in FIGS. 11 (a) and 11 (b). When the drive lever 11 rotates, the protrusion 11e of the drive lever 11 pushes the protrusion 15b of the blade lever 15, and the blade lever 15 also rotates. As the drive lever 11 and the blade lever 15 rotate together, the first blade 41 and the second blade 42 run in a direction to close the openings 1 a and 2 a against the urging force of the blade return spring 46. .

  In the set release state illustrated in FIG. 10, the protrusion 11 e of the drive lever 11 is already in contact with the protrusion 15 b of the blade lever 15. When the coil 34 is deenergized, the drive lever 11 and the blade lever 15 rotate together by the urging force of the blade drive spring 14. That is, in the present embodiment, when the first blade 41 and the second blade 42 travel in the direction to close the openings 1a and 2a, the drive lever 11 and the blade lever 15 are integrally rotated from the start of traveling.

  While the first blade 41 and the second blade 42 are traveling in the direction of closing the openings 1a and 2a, the protrusion 11e of the drive lever 11 collides with the protrusion 15b of the blade lever 15, and then the drive lever 11 and the blade lever It is also conceivable that 15 is integrally rotated. However, in this case, the rotational speed changes before and after the collision between the drive lever 11 and the blade lever 15, and the traveling accuracy of the first blade 41 and the second blade 42 decreases.

  In the present embodiment, the drive lever 11 and the blade lever 15 are integrated before the first blade 41 and the second blade 42 are traveled, and the drive lever 11 and the second blade 42 are traveling while the first blade 41 and the second blade 42 are traveling. The blade lever 15 is integrally rotated. As a result, the rotational speeds of the drive lever 11 and the blade lever 15 are stabilized, and the traveling accuracy of the first blade 41 and the second blade 42 is also good.

  Further, since the drive lever 11 and the blade lever 15 rotate integrally, the relative position between the roller 13 attached to the roller holding shaft 11d of the drive lever 11 and the roller receiving portion 15d of the blade lever 15 does not change. . Thus, no friction is generated between the roller 13 and the roller receiving portion 15d while the first blade 41 and the second blade 42 are traveling in the direction of closing the openings 1a and 2a. While the first blade 41 and the second blade 42 are traveling, even if the direction of gravity acting on the roller changes due to a change in posture, the relative position between the roller 13 and the roller receiving portion 15d does not change, so the friction coefficient changes. There is nothing. In this embodiment, the friction when the first blade 41 and the second blade 42 are driven in the direction of closing the openings 1a and 2a is reduced, and the traveling accuracy of the first blade 41 and the second blade 42 is improved. .

  When the first blade 41 and the second blade 42 travel to the position where they close the openings 1a and 2a, the H blade traveling complete state shown in FIG.

  The state of H shown in FIG. 6 is a blade running complete state. FIG. 12 shows the state of the shutter unit 100 in the blade running complete state. FIG. 12A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 12B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  When the engaging portion 15a formed on the blade lever 15 collides with the buffer member 3 disposed on the upper portion of the arc-shaped hole 1e formed on the shutter base plate 1, the first blade 41 and the second blade 42 are opened. Stop at the position where 1a and 2a are closed.

  At this time, the protruding portion 11 e of the drive lever 11 is in contact with the protruding portion 15 b of the blade lever 15. That is, in the present embodiment, when the first blade 41 and the second blade 42 travel in the direction to close the openings 1a and 2a, the drive lever 11 and the blade lever 15 rotate together from the beginning to the end of traveling. It is moving.

  In the blade travel complete state shown in FIG. 12, the blade return spring 46 is charged by the first blade 41 and the second blade 42 closing the openings 1a and 2a.

  Further, in the blade travel completion state, it is detected by the photo sensor 32 provided on the auxiliary base plate 31 that the blade lever 15 is in the rotational position where the blade travel is completed.

  The motor is energized a predetermined time after the energization of the coil 34 is turned off. When the first cam gear 21 and the second cam gear 22 rotate by energization of the motor, the mirror lever charge state I shown in FIG. 6 is obtained.

  The state I shown in FIG. 6 is a mirror lever charge state. The first cam gear 21 and the second cam gear 22 rotate from the state shown in FIG. 12, and the first cam 22 a of the second cam gear 22 contacts the cam follower 36 a of the mirror lever 36. The mirror lever 36 charges the mirror lever drive spring 39 by rotating counterclockwise in FIG. When the mirror lever 36 is rotated counterclockwise in FIG. 12A, the main mirror 6 is rotated in the down direction by the urging force of the main mirror drive spring 7.

  In the mirror lever charge state, the first blade 41 and the second blade 42 are stopped at the positions where the openings 1a and 2a are closed, as in the blade running complete state.

  When energization of the motor is continued in the mirror lever charge state, the first cam gear 21 and the second cam gear 22 further rotate, and the mirror lever charge completion state J shown in FIG.

  The state J shown in FIG. 6 is a mirror lever charge complete state. FIG. 13 shows the state of the shutter unit 100 in the mirror lever charge complete state. FIG. 13A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 13B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  When the second cam gear 22 further rotates counterclockwise in FIG. 13A from the mirror lever charged state, the mirror lever 36 charges the mirror lever drive spring 39. As the mirror lever 36 rotates, the main mirror 6 further rotates in the down direction, abuts against a stopper (not shown), and stops. Even after the main mirror 6 stops at the down position, the second cam gear 22 rotates and the cam follower 36a of the mirror lever 36 reaches the cam top position 22e of the first cam 22a of the second cam gear 22. At this time, as illustrated in FIG. 13A, a gap is formed between the shaft portion 6 a of the main mirror 6 and the contact portion 36 b of the mirror lever 36. As a result, even if an error occurs in the position of the mirror lever 36, the position of the main mirror is held at a correct position by a stopper (not shown).

  When energization of the motor is continued in the mirror lever charge complete state, the first cam gear 21 and the second cam gear 22 are further rotated to be in a K lever lever lockable state shown in FIG.

  The state K shown in FIG. 6 is a state in which the blade lever can be locked. FIG. 14 shows the state of the shutter unit 100 in a state where the blade lever can be locked. FIG. 14A is a view of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 14B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  As the first cam gear 21 rotates, the cam 21b of the first cam gear 21 moves to a position where the cam follower 15e of the blade lever 15 can contact. In the state in which the blade lever can be locked shown in FIG. 14, the protrusion 11e of the drive lever 11 presses the protrusion 15b of the blade lever 15 by the biasing force of the blade drive spring 14, so that the cam follower 15e of the blade lever 15 It is not in contact with the cam 21b of one cam gear 21.

  When energization of the motor is continued in the blade lever locking state, the first cam gear 21 and the second cam gear 22 are rotated to enter the L driving lever charging state shown in FIG.

  The state L shown in FIG. 6 is a drive lever charge state. FIG. 15 shows the state of the shutter unit 100 in the drive lever charging state. FIG. 15A is a diagram of the shutter unit 100 as viewed from the main mirror 6 side. FIG. 15B is a diagram of the shutter unit 100 viewed from the image sensor 116 side. In order to explain the operation of each cam gear and each lever, the shutter base plate 1, the cover plate 2, and the auxiliary base plate 31 are omitted.

  As the second cam gear 22 rotates, the second cam 22c of the second cam gear 22 pushes the roller 13 held by the drive lever 11. As a result, the drive lever 11 rotates counterclockwise in FIG. 15A and charges the drive spring 14. When the drive lever 11 rotates counterclockwise in FIG. 15A, the contact between the protrusion 11e of the drive lever 11 and the protrusion 15b of the blade lever 15 is released. Accordingly, the blade lever 15 is rotated counterclockwise in FIG. 15B by the urging force of the blade return spring 46, and the cam follower 15 e of the blade lever 15 contacts the cam 21 b of the first cam gear 21. Accordingly, the blade lever 15 is held at the position illustrated in FIG. 15B, and the first blade 41 and the second blade 42 maintain the state in which the openings 1a and 2a are closed.

  When energization of the motor is continued in the drive lever charge state, the second cam gear 22 further rotates, and the M drive lever charge complete state shown in FIG. 6 is reached.

The state M shown in FIG. 6 is a drive lever charge complete state. When the roller 13 held by the drive lever 11 reaches the cam top portion 22d of the second cam 22c of the second cam gear 22, the drive lever 11 is overcharged with the blade drive spring 14. When the energization of the motor is stopped in this state, the state A shown in FIG.
FIG. 16 is a diagram illustrating the shapes of the blade cushioning member 4 and the blade contact member 5.
FIG. 16A is a view for explaining the shape of the blade contact member 5 before being assembled to the blade cushioning member 4. FIG. 16B illustrates the shape of the blade cushioning member 4 before the blade contact member 5 is assembled.

  As illustrated in FIG. 16A, the blade contact member 5 has an arm portion 5 a so as to be along the side surface of the blade cushioning member 4 when assembled with the blade cushioning member 4 in order to stabilize the collision state with the blade. In addition, the arm portion 5b is biased by a spring force and always keeps contact with the blade cushioning member 4.

  As illustrated in FIG. 16B, the blade cushioning member 4 has portions 4a to 4f.

  In the blade cushioning member 4, the portion 4a is formed one step lower than the portion 4d, and the portion 4b is formed one step lower than the portion 4e. The hole 4 h into which the shaft 1 h formed on the shutter base plate 1 is fitted is formed at a position eccentric from the center of the blade cushioning member 4. 4 d of the blade cushioning member 4 is inscribed in the arm portion 5 a of the blade contact member 5 and 4 e of the blade cushioning member 4 is inscribed in the arm portion 5 b of the blade contact member 5. Assemble. When the blade contact member 5 is assembled to the blade buffer member 4 in this manner, the portion 4a is in the vicinity of the bent portion of the arm portion 5a, and the portion 4b is in the vicinity of the bent portion of the arm portion 5b. As shown in FIG. 16A, the arm portion 5a and the arm portion 5b are bent so as to be equal to or less than a right angle. Therefore, by forming the portion 4a, the arm portion 5a follows the deformation of the portion 4d. It becomes easy. Similarly, by forming the portion 4b, the arm portion 5b can easily follow the deformation of the portion 4e. Further, even when the finished dimensions of the portion 4d and the portion 4e are larger than those of the arm portion 5a and the arm portion 5b, the arm portion 5a and the arm portion 5b do not float from the portion 4d and the portion 4e.

  A notch 5e is formed between the part 5c and the part 5d so that the elastic deformation of the part 5c and the part 5d is not prevented even when an impact is applied to the part 5c and the part 5d.

  The portion 4c of the blade cushioning member 4 is formed with a chamfered shape so that the rotation direction and the reverse side of the blade cushioning member 4 with respect to the shaft portion 1h can be confirmed at a glance.

  When the first blade 41 and the second blade 42 collide with the arm portion 5a of the blade contact member 5, the arm portion 5a is elastically deformed with the bent portion as a rotation center, but the blade buffer member 4 is compressively deformed at the portion 4d. .

  The same applies when the first blade 41 and the second blade 42 collide with the arm portion 5 b of the blade contact member 5. When the first blade 41 and the second blade 42 collide with the portion 5c of the blade contact member 5, the portion 5c is elastically deformed around the boundary with the portion 5f, but the blade cushioning member 4 has the portion 4g. Compressive deformation. Therefore, the blade contact member 5 can be deformed independently of the blade buffer member 4.

  FIG. 17 is a view for explaining a method of attaching the blade cushioning member 4 to the shaft portion 1h. FIG. 17A is an enlarged view of the blade cushioning member 4 when the shutter unit 100 is in the set release state illustrated in FIG. FIGS. 17B to 17D show examples in which the attachment direction of the blade cushioning member 4 is changed when the blade cushioning member 4 is attached to the shaft portion 1h.

  As shown in FIGS. 17A to 17D, when the hole 4h of the blade cushioning member 4 is engaged with the shaft 1h of the shutter base plate 1, the shaft portion is changed by changing the mounting direction of the blade cushioning member 4. The distance from 1h to the surface receiving the impact from the first blade 41 and the second blade 42 of the blade cushioning member 4 changes.

  The magnitude relationships among the dimensions A, B, C, and D shown in FIGS. 17A to 17D are B <A <D <C. It is conceivable that the tip positions of the first blade 41 and the second blade 42 from the shaft portion 1h change from the distance a to the distance d as shown in FIGS. However, in this case as well, the clearance α between the blade cushioning member 4 and the shutter blade can be set within a predetermined range by changing the mounting direction of the blade cushioning member 4 to the shaft portion 1h.

  Therefore, the clearance between the first blade 41 and the second blade 42 and the blade contact member 5 can be adjusted without preparing a dimensioning component.

(Modification)
In the embodiment described above, the distance from the shaft portion 1h to the surface receiving the impact from the first blade 41 and the second blade 42 of the blade cushioning member 4 can be adjusted in four stages. In order to adjust to 5 stages and 6 stages, it can be considered that the outer shapes of the blade cushioning member 4 and the blade contact member 5 are polygons such as pentagons and hexagons. However, when polygonalization is advanced in this way, the size of one side becomes smaller, and the area necessary for receiving impact from the first blade 41 and the second blade 42 cannot be secured. If the size of the blade cushioning member 4 and the blade contact member 5 is increased, a sufficient area may be secured even if it is polygonal, but it is not realistic.

  In view of this point, in the modified example, the combination of the blade cushioning member 4 and the blade contact member 5 has a two-layer structure, thereby enabling eight-stage adjustment.

  FIG. 18 is a perspective view illustrating a state where the blade contact member 105A and the blade contact member 105B are assembled to the blade buffer member 104. FIG.

  FIG. 18A is a diagram illustrating the shape of the blade cushioning member 104 before the blade contact member 105A and the blade contact member 105B are assembled. FIG. 18B is a perspective view illustrating a state where the blade contact member 105B is assembled to the blade cushioning member 104. FIG. FIG. 18C is a perspective view illustrating a state in which the blade contact member 105 </ b> A is assembled to the blade cushioning member 104.

  As illustrated in FIG. 18A, the blade cushioning member 104 has a shape in which two blade cushioning members 4 having different sizes are stacked. The blade contact member 105B is assembled to a small portion of the blade buffer member 104 as illustrated in FIG. The shape is the same as that of the blade contact member 5. The blade contact member 105A is assembled to a large portion of the blade cushioning member 104 as shown in FIG. The shape is the same as that of the blade contact member 5.

  FIG. 19 is a view for explaining a method of attaching the blade cushioning member 104 to the shaft portion 1h. FIG. 19A is an enlarged view of the blade cushioning member 4 when the shutter unit 100 is in the set release state shown in FIG. FIGS. 19B to 19H show examples in which the attachment direction of the blade cushioning member 4 is changed when the blade cushioning member 4 is attached to the shaft portion 1h.

  As shown in FIGS. 19A to 19H, when the blade cushioning member 104 is fitted to the shaft portion 1h, the mounting direction of the blade cushioning member 104 is changed to change the blade cushioning member 104 from the shaft portion 1h. The distance from the first blade 41 and the second blade 42 to the surface receiving the impact changes.

  A hole portion through which the shaft portion 1 h formed in the blade cushioning member 104 is inserted is formed at a position eccentric from the center of the blade cushioning member 104.

  It is conceivable that the tip positions of the first blade 41 and the second blade 42 change from the distance a to the distance h as shown in FIGS. 19A to 19H due to variations in parts. However, by changing the mounting direction of the blade cushioning member 4 to the shaft portion 1h, the clearance α between the blade cushioning member 4 and the shutter blade can be set within a predetermined range.

  Therefore, the clearance between the first blade 41 and the second blade 42 and the blade contact member 105A or 105B can be adjusted without preparing a dimensioning component.

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1h Shaft part 4 Blade | blade buffer member 5 Blade | wing contact member 41 1st blade | wing 42 2nd blade | wing

Claims (5)

A shutter base plate in which an aperture through which a photographic beam passes is formed;
A shutter blade that moves to the closed state and the open state by moving;
When the movement of the shutter blade on the shaft portion is completed, the shutter device has a blade cushioning member that relaxes an impact acting on the shutter blade,
A shaft portion is formed on the shutter base plate, a hole is formed in the blade cushioning member, and the blade cushioning member is attached to the shutter base plate by mating the shaft portion with the hole portion. Because
By changing the mounting direction of the blade cushioning member, the hole portion is decentered from the center of the blade cushioning member so that the distance from the shaft to the surface receiving the impact from the shutter blade of the blade cushioning member is changed. A shutter device characterized by forming a shutter.   The blade cushioning member has a polygonal outer shape, the shaft portion is formed in the same polygon as the outer shape of the blade cushioning member, and the blade cushioning member is attached to the shutter base plate, The shutter device according to claim 1, wherein a side of the outer shape and a side of the shaft portion are formed substantially parallel to each other.   The blade contact member is disposed between the shutter blade and the blade cushioning member and can be deformed independently of the blade cushioning member regardless of the mounting direction of the blade cushioning member. The shutter device according to 1 or 2.   The shutter device according to claim 3, wherein the blade contact member is made of a material having higher wear resistance than the blade buffer member.   An imaging apparatus comprising the shutter device according to claim 1.

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