JP2012098455A - Return mirror mechanism of single lens reflex camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a return mirror mechanism of a single lens reflex camera that can advantageously regulate bound at a rotation end position of a return mirror without increasing a manufacturing cost and a camera body in size.SOLUTION: A first bound regulation part 37 is provided on a mirror position control lever 30. A second bound regulation part 47 is provided on a rotation cam member 40, which regulates a bound of a return mirror 20 with respect to a stopper 27 in a certain range by contacting the first bound regulation part 37 when the rotation cam member 40 is arranged at a position other than an initial position and the return mirror 20 is moved to an interference position to contact the stopper 27.

Description

  The present invention relates to a return mirror mechanism of a single-lens reflex camera.

In the camera body of the single-lens reflex camera disclosed in Patent Document 1, an interference position (lower limit position) for reflecting the light beam transmitted through the photographing lens to the viewfinder side, and the light beam on the image sensor while avoiding interference with the light beam. Can rotate between a non-interference position (upper limit position) that allows image formation with the lens, and is rotated in one direction by the drive force of the motor and a return mirror that is biased toward the interference position by the biasing means. A cam plate (gear) that can be swung, a charge lever for charging a shutter that engages with a cam surface formed on the cam plate, swivels in conjunction with the charge lever, and is fixed to a return mirror A QR lever that engages with the drive shaft is provided.
When the motor is stopped, the return mirror is positioned at the interference position by the biasing force of the biasing means, so that the photographer can observe the subject through the viewfinder. On the other hand, when the shutter button is fully pressed in the continuous shooting mode, the cam is rotated a plurality of times per second by rotating the motor a plurality of times per second, so that the charge lever receiving the force from the cam surface of the cam panel is rotated a plurality of times. Swing. Then, between the position where the QR lever allows the return mirror to be positioned at the interference position and the position where the return mirror is moved to the non-interference position against the biasing force of the biasing means by pressing the drive shaft. Since the shutter and the image sensor continuously operate in conjunction with the movement of the return mirror, the subject is continuously imaged a plurality of times.

JP 2006-184717 A

In a single-lens reflex camera having the above-described structure, it is common to provide a stopper that mechanically contacts a return mirror that has moved to a non-interference position and restricts the return mirror from rotating beyond the non-interference position.
In recent years, there is an increasing demand for a high speed with respect to the continuous shooting speed in the continuous shooting mode, so that the rotational speed of the cam panel is increased. Therefore, when the return mirror rotates to the non-interference position, the return mirror may receive a large reaction force from the stopper and instantaneously bounce to the interference position side, and immediately after that, a bounce phenomenon may occur that returns to the non-interference position. It is high. When the bounce phenomenon occurs, there is a risk that the luminous flux to be photographed may be vignetted by the mirror, or the finder image for the next photographing may be shaken.

As a measure for solving such a problem, for example, it is conceivable to devise the cam surface shape of the cam disk. However, since the rotational speed of the cam panel is increased, it is practically difficult to regulate the bounce only by devising the cam surface shape.
As another measure, it is conceivable to provide a damper for suppressing the bounce phenomenon in the stopper. However, providing a damper not only increases the number of parts and increases the manufacturing cost, but also increases the size of the camera body by the installation space for the damper.

  An object of the present invention is to provide a return mirror mechanism of a single-lens reflex camera that can effectively regulate the bounce at the rotation end position of the return mirror without increasing the manufacturing cost or enlarging the camera body.

  The return mirror mechanism of the single-lens reflex camera of the present invention is capable of reciprocating between an interference position that reflects the light beam that has passed through the photographing lens toward the viewfinder side and a non-interference position that avoids interference with the light beam, and the interference The return mirror rotates beyond the other position by contacting the return mirror biased toward one of the position and the non-interference position and the return mirror rotated to the other of the interference position and the non-interference position. A one-way rotating member that rotates in one direction by the driving force of the driving means, a reciprocating driving member that reciprocates the return mirror by rotation of the one-way rotating member, and the reciprocating driving member or A first bounce restricting portion formed on the return mirror, and the return mirror formed on the one-way rotating member moves to the other position. When contacted with serial stopper, and a bound for the stopper of the return mirror characterized by and a second bound regulating portion for regulating within a predetermined range by contacting the first bound regulating portion above.

  The unidirectional rotating member is a rotating cam member having a cam surface and rotating in one direction by the driving force of the driving means and positioned at an initial position when the driving means stops, the reciprocating driving member Is provided with a cam follower surface that contacts the cam surface of the rotating cam member by the biasing force of the biasing means, and the contact position of the cam follower surface with the cam surface changes as the rotating cam member rotates. A mirror position control lever that alternately moves between a rotation allowable position that allows the return mirror to rotate to the one position and a maximum pressing position that presses the return mirror to the other position. .

  The second bounce restricting portion may contact the first bounce restricting portion when the rotating cam member is located at a position other than the initial position.

  The return mirror, the stopper, the rotating cam member, the mirror position control lever, and the bounce restricting means are provided in the camera body to which the photographing lens can be attached and detached, and when the rotating cam member is located at the initial position, the first The engagement between the bound restricting portion and the second bound restricting portion may be disabled.

One of the first bound restricting portion and the second bound restricting portion is a bound restricting projection formed on one of a mirror position control lever or a return mirror and the rotating cam member, and the first bound restricting portion and the above The other of the second bound restricting portions may be a side surface of a bound restricting groove formed on the other of the mirror position control lever or the return mirror and the rotating cam member, through which the bound restricting protrusion can pass.
In this case, a gap may be formed between the side surface of the bound regulating groove and the bound regulating projection when the bound regulating projection is positioned inside the bound regulating groove.

  The end surface on the rotational direction side of the rotating cam member in the bound regulating protrusion may be an inclined end surface that is inclined with respect to the radial direction of the rotating cam member.

According to the present invention, when the return mirror moves to a position that is not urged by the urging means between the interference position and the non-interference position and contacts the stopper, the return mirror is restricted from rotating beyond the position. . At this time, when the return mirror instantaneously bounces from the position to the opposite position (position urged by the urging means) by the reaction force received from the stopper, the return mirror or reciprocating drive member is formed. Since the 1st bound regulation part which contacted the 2nd bound regulation part formed in the one way rotation member, this bound operation is regulated.
Moreover, since the first bounce restricting portion is formed on the return mirror or the reciprocating drive member, and the second bounce restricting portion is formed on the rotating cam member, compared to the case of providing a damper that is a separate member from these members. Thus, an increase in manufacturing cost and an increase in size of the camera body can be suppressed.

  According to the fourth aspect, when the photographing lens is removed from the camera body, the inside of the camera body is exposed to the outside. However, if the rotating cam member is positioned at the initial position by stopping the driving means, the first bound restricting portion and the second bound restricting portion cannot be engaged with each other, so the user forcibly rotates the return mirror. Even if it does, there is no possibility that strong force will arise between the 1st bound regulation part and the 2nd bound regulation part, and both members may be destroyed.

  According to the fifth aspect of the present invention, when viewed from the direction orthogonal to the rotation axis of the rotating cam member, the position of the bounce restricting protrusion and the bounce restricting groove in the direction of the rotation axis coincide. Therefore, the return mirror mechanism can be made compact in the rotation axis direction.

  According to the sixth aspect of the present invention, even if the relative position between the mirror position control lever or the return mirror and the rotating cam member (or the relative position between the bounce regulating projection and the bounce regulating groove) is slightly deviated from the design position, the bounce Since the restricting protrusion can smoothly pass through the bound restricting groove, the operation of the return mirror mechanism does not become unsmooth.

  When the user rotates the rotating cam member by the drive means after the return mirror has stopped between the interference position and the non-interference position, such as by holding the return mirror by hand, There is a possibility that the mirror position control lever or the return mirror and the rotating cam member may be locked due to collision with the end face of the formed member. However, if the inclined end face is formed on the bounce restricting protrusion as in claim 7, the inclined end face gets over the end face of the member on which the bounce restricting groove is formed and passes through the member, so that the mirror position control lever or the return mirror and It is possible to avoid the rotation cam member from being locked.

1 is a longitudinal side view schematically showing a digital camera according to an embodiment of the present invention. It is a perspective view of the return mirror mechanism in a photographing standby state. It is a side view of the return mirror mechanism in a photographing standby state. It is a perspective view of a rotation cam gear. It is a perspective view of a mirror position control lever. It is a side view which abbreviate | omits a rotation cam gear and shows a return mirror mechanism when a return mirror is located in a non-interference position. FIG. 7 is a side view similar to FIG. 6 when the rotating cam gear rotates from the initial position and the return mirror rotates from the non-interference position to the interference position side. FIG. 7 is a side view similar to FIG. 6 when the rotating cam gear is located at a position other than the initial position and the return mirror is located at the interference position. FIG. 7 is a side view similar to FIG. 6 in a shooting standby state. FIG. 7 is a side view similar to FIG. 6 when the bounce regulating protrusion of the rotating cam gear collides with the end face of the mirror position control lever.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The direction in the following description is based on the arrow in the figure.
As shown in FIG. 1, a digital camera 10 to which the present invention is applied includes an interchangeable lens barrel 11 having a photographing lens L, and a camera body 12 to which the interchangeable lens barrel 11 can be attached and detached at the front opening. It will be. An imaging element 13 located on the optical axis O of the photographic lens L is fixed at the rear of the camera body 12, and a shutter 14 located on the optical axis O is provided immediately before the imaging element 13. A prism 15 is fixed to the upper part in the camera body 12, and a finder window 16 positioned immediately after the prism 15 is provided on the rear surface of the camera body 12.
Further, a rotatable return mirror 20 is provided in the camera body 12. The return mirror 20 includes a square frame-shaped mirror support frame 22 that integrally includes a pair of left and right rotation support shafts 21 on the rear end side, and a mirror 23 fixed inside the mirror support frame 22. Yes. A pressed protrusion 24 that extends toward the left is integrally formed at the rear of the left side of the mirror support frame 22, and a stopper piece 25 is integrally provided at the front end of the right side. . Since the left and right rotation support shafts 21 are rotatably supported on the left and right inner walls of the camera body 12, the return mirror 20 has a 45 ° angle with respect to the optical axis O about the rotation support shaft 21 and the photographing lens L. Interference position (the solid line in FIG. 1, positions in FIGS. 2, 3, 8, and 9) and a non-interference position that is substantially parallel to the optical axis O and retracts above the light beam. It is possible to rotate between (the phantom line in FIG. 1 and the position in FIG. 6). As shown in FIG. 2, a stopper 27 is fixed to the right inner wall of the camera body 12 using an eccentric screw mechanism whose axis extends in the left-right direction. When the return mirror 20 rotates to the interference position, the stopper piece 25 When the lower surface comes into contact with the stopper 27, further downward rotation of the return mirror 20 is restricted. Although not shown, when the return mirror 20 rotates to the non-interference position, the front edge portion 26 of the mirror support frame 22 comes into contact with a cushioning component (not shown) fixed inside the camera body 12, and the return mirror Further upward rotation of 20 is restricted. When the return mirror 20 is located at the interference position, the light beam that has passed through the photographing lens L is reflected by the mirror 23 toward the prism 15 and then travels toward the finder window 16. Accordingly, at this time, the photographer can observe the subject by looking through the finder window 16. On the other hand, when the return mirror 20 is positioned at the non-interference position, the return mirror 20 does not interfere with the light beam that has passed through the photographing lens L, so the light beam is directed toward the shutter 14.

On the left inner wall of the camera body 12, a rotation support shaft 31 extending leftward from the front end portion of the mirror position control lever (reciprocating drive member) 30 is rotatably supported. The mirror position control lever 30 includes a spring hook 32 positioned directly above the rotation support shaft 31, a pressing portion 33 projecting downward from the rear end of the rotation support shaft 31, and a boss 34 extending rightward from the right side surface. And a cam projection 35 projecting downward from an intermediate portion in the longitudinal direction. The circumferential surface (lower surface) of the cam projection 35 is a cam follower surface 36 formed of a curved surface, and a substantially arc-shaped bound regulating groove (first bound regulating portion) 37 is provided in the left side surface of the cam projecting portion 35. It is. An end protrusion 38 is formed at a lower portion of the bounce restricting groove 37 in the cam protrusion 35. As shown in the drawing, the pressing portion 33 of the mirror position control lever 30 is located immediately above the pressed protrusion 24 of the return mirror 20.
As shown in FIGS. 2 and 3, the boss 34 of the mirror position control lever 30 is wound around the winding portion S1a of the torsion coil spring S1, and the locking end S1b which is one end of the torsion coil spring S1 is a mirror. The locking end S1c, which is the other end of the torsion coil spring S1, is locked to the lower surface of the pressed protrusion 24.
Further, as shown in FIG. 3, a winding end S <b> 2 a of a torsion coil spring S <b> 2 having a stronger urging force than the torsion coil spring S <b> 1 is wound around the rotation support shaft 31, and a locking end that is one end of the torsion coil spring S <b> 2. The portion S2b is locked to a locking portion (not shown) formed on the inner wall of the camera body 12, and a locking end S2c that is the other end of the torsion coil spring S2 is locked to the spring hook portion 32. . Therefore, the mirror position control lever 30 is always urged to rotate counterclockwise in FIG. 3 by the urging force of the torsion coil spring S2.

A support shaft 17 is provided on the left inner wall of the camera body 12 so as to extend rightward. The support shaft 17 passes through the center of a rotating cam gear (rotating cam member) (one-way rotating member) 40. A central shaft hole 41 is rotatably supported. A large number of gear teeth 42 are formed side by side on the outer peripheral surface of the rotating cam gear 40. On the right side surface of the rotating cam gear 40, a cylindrical portion 43 through which the central shaft hole 41 passes and a cam projection 45 project rightward. As shown in the drawing, the outer peripheral surfaces of the cylindrical portion 43 and the cam protrusion 45 are continuous with each other, and the outer peripheral surface of the cam protrusion 45 has a radial distance from the center position of the central shaft hole 41 according to the position in the circumferential direction. The cam surface 46 changes. Further, another position on the right side surface of the rotating cam gear 40 is provided with a bounce regulating projection (second bounce regulating portion) 47 whose left-right position coincides with the bounce regulating groove 37 of the mirror position control lever 30. It is. As shown in the drawing, a part of the peripheral surface of the bounce restricting protrusion 47 is an inclined end surface 48 that is inclined with respect to the radial direction of the rotating cam gear 40.
The gear teeth 42 of the rotating cam gear 40 mesh with a rotating cam gear for shutter (not shown) rotatably supported on the left inner wall of the camera body 12, and the rotating cam gear for shutter is connected to the camera body 12 via a gear train. Is connected to a rotation output shaft of a motor (driving means) M (see FIG. 1) fixed inside.
The motor M is stopped when the shutter button (not shown) provided on the camera body 12 is not fully pressed. On the other hand, when the shutter button is fully pressed once in the normal shooting mode, one rotation is performed, and when the shutter button is fully pressed once in the continuous shooting mode, five rotations are continuously performed per second. When the motor M is stopped, the rotating cam gear 40 is located at the initial position shown in FIGS. When the motor M rotates in the normal shooting mode, the rotating cam gear 40 rotates once in the counterclockwise direction of FIG. 3 (in the direction of arrow R in FIGS. 3 and 6 to 8) from the initial position, and the motor M rotates in the continuous shooting mode. Then, the rotating cam gear 40 rotates 5 times per second.
Among the members described above, the return mirror 20, the mirror position control lever 30, the rotating cam gear 40, the shutter rotating cam gear, the gear train, the motor M, the torsion coil spring S1, and the torsion coil spring S2 are components of the return mirror mechanism 50. It is.

As described above, the rotating cam gear 40 is rotated by the driving force of the motor M, the rotating cam gear 40 is linked to the mirror position control lever 30, and the mirror position control lever 30 is linked to the return mirror 20. When the shutter button is fully pressed so that the motor M rotates, the return mirror 20 rotates.
FIG. 9 shows the return mirror mechanism 50 when the motor M is in a shooting standby state where the motor M is stopped. At this time, the rotating cam gear 40 is located at the initial position, the cam follower surface 36 of the cam projection 35 is spaced upward from the outer peripheral surface of the cylindrical portion 43, and is mirrored by the torsion coil spring S2. Since the pressing portion 33 of the lever 30 presses the pressed protrusion 24 of the return mirror 20 biased by the torsion coil spring S1 from above to below, the stopper piece 25 of the return mirror 20 contacts the stopper 27. It is located at the interference position.
When the shutter button is fully pressed once when the shooting mode is the continuous shooting mode, the motor M rotates continuously in the above direction 5 times per second. Then, when the rotating cam gear 40 receiving the rotational force of the motor M via the gear train and the shutter rotating cam gear rotates in the R direction from the initial position to the position shown in FIG. 6, the cam surface 46 of the cam protrusion 45 becomes the cam protrusion. Since the mirror position control lever 30 is pushed up to a position far from the central shaft hole 41 in the radial direction by contacting the cam follower surface 36 of the shaft 35, the mirror position control lever 30 is shown in FIG. 6 against the urging force of the torsion coil spring S2. Rotates to the rotation allowable position. Then, the pressing portion 33 of the mirror position control lever 30 is separated upward from the pressed protrusion 24 of the return mirror 20, and the locking end S1c of the torsion coil spring S1 rotated together with the mirror position control lever 30 is pressed. Since the lower side of the portion 24 is lifted upward, the return mirror 20 rotates to the non-interference position shown in FIG. 6, and the front edge portion 26 of the mirror support frame 22 comes into contact with the cushioning component.
When the motor M further rotates, the portion of the cam surface 46 that is close to the radial distance from the central shaft hole 41 (the portion that is closer to the portion that contacts the cam follower surface 36 in FIG. 6) contacts the cam follower surface 36 of the cam projection 35. Therefore, as shown in FIG. 7, the mirror position control lever 30 moves downward from the rotation allowable position in FIG. 6, and the pressing portion 33 presses the pressed protrusion 24 downward. Then, as shown in FIG. 7, the return mirror 20 located at the non-interference position rotates to the interference position side, and the bounce restricting projection 47 approaches the front opening end of the bounce restricting groove 37.

When the motor M further rotates, the stopper piece 25 comes into contact with the stopper 27, whereby the rotation of the return mirror 20 is restricted at the interference position, and the rotation of the mirror position control lever 30 by the pressed projection 24 is shown in FIG. It is regulated at the maximum pressing position (position in FIG. 8) below the position. However, since the rotating cam gear 40 continues to rotate further, a gap is formed between the cam follower surface 36 and the cam surface 46 as shown in FIG. This gap is adjusted by 45 ° of the return mirror 20 (“adjustment for making the mirror 20 an angle of exactly 45 ° with respect to the optical axis O of the photographing light at the interference position to reflect the light beam strictly vertically (upward)). Specifically, it is provided in consideration of the fact that the stopper 27 is rotated and adjusted using the eccentric screw mechanism. If there is no “gap”, depending on how the 45 ° adjustment is performed, before the state shown in FIG. 8 is reached (before the bounce restriction described later by the end protrusion 38 and the bounce restriction protrusion 47 is performed), There is a possibility that the bound restricting convex portion 47 comes into contact with members around the bound restricting groove 37. Then, immediately before the return mirror 20 reaches the interference position, the bounce regulating projection 47 of the rotating cam gear 40 enters the bounce regulating groove 37 of the mirror position control lever 30. When the return mirror 20 rotates to the interference position in this way, the stopper piece 25 contacts the stopper 27 as described above (see FIG. 2), so that the stopper piece 25 receives an upward reaction force from the stopper 27, and the return mirror 20 This reaction force momentarily bounces upward (non-interference position side). Then, the mirror position control lever 30 (pressing portion 33) is momentarily pressed upward by the pressed projection 24, but after the mirror position control lever 30 has moved a very short distance, the upper surface of the end projection 38 ( Since the lower surface of the bounce regulating groove 37 abuts the lower surface of the bounce regulating projection 47, further movement of the mirror position control lever 30 is regulated, and the mirror position control lever 30 immediately returns to the maximum pressing position. Accordingly, the return mirror 20 also returns to the interference position (position where the stopper piece 25 contacts the stopper 27) immediately after bouncing.
When the rotating cam gear 40 returns to the initial position due to further rotation of the motor M, the return mirror mechanism 50 returns to the state shown in FIGS.
In the continuous shooting mode, since the motor M rotates 5 times in one second, if the shutter button is continuously pressed for 1 second, the return mirror mechanism 50 performs this operation five times, and the return mirror mechanism 50 The imaging standby state is again entered (the state shown in FIGS. 2 and 9).

The rotating cam gear for the shutter described above is for controlling the operation of the shutter 14, and is connected to a charge spring (torsion coil spring) (not shown), and the charge state (elastic deformation state) of the charge spring is for the shutter. The rotation cam gear and the rotation position of the rotation cam gear 40 are interlocked with each other. That is, when the return mirror mechanism 50 is in the shooting standby state (when the rotating cam gear 40 is located at the initial position), the charge spring is in the charged state, and the shutter 14 (the front curtain and the rear curtain) moves in front of the image sensor 13. Block completely (shield). In the process in which the rotating cam gear 40 rotates from the initial position to the position shown in FIG. 6, the charge states of the front curtain and the rear curtain are maintained by the corresponding solenoids. However, when the shutter button is fully pressed, the charge is maintained by each solenoid. Since the force is released at a predetermined timing and the charge spring tries to return to the free state using the stored elastic force, the shutter 14 forms the predetermined opening by the urging force of the charge spring while the imaging element 13 The image sensor 13 is exposed by moving immediately before. Then, when the rotating cam gear 40 returns to the initial position, the charge spring is again charged, and the shutter 14 again closes immediately before the image sensor 13.
Therefore, if the shutter button is fully pressed in the continuous shooting mode, this operation is performed five times in one second, and the image sensor 13 images the subject five times in succession.

As described above, according to the present embodiment, the bounce of the return mirror 20 when the return mirror 20 rotates to the interference position is caused by the bounce regulating groove 37 of the mirror position control lever 30 and the bounce regulating projection 47 of the rotating cam gear 40. Since the return mirror 20 is quickly stopped while being regulated within an extremely short distance, it is possible to perform photometry and distance measurement on the next frame in a short wait time, and therefore, it is easy to improve the continuous shooting speed. Further, when the return mirror 20 and the mirror position control lever 30 remain bound, the load fluctuations on the rotating cam gear 40 and the motor M become large (and the load fluctuations change every time shooting is performed), so that the motor M control becomes difficult. And the burden on mechanical parts will increase. That is, it is beneficial for improving the continuous shooting speed that the bouncing end is quick mechanically.
In addition, the manufacturing cost is increased and the camera body is increased as compared with the case where a damper, which is a separate member from the mirror position control lever 30 and the rotating cam gear 40, is provided on the pressed protrusion 24, the pressing portion 33, the stopper 27, the stopper piece 25, and the like. Increase in size can be suppressed.
Further, since the left and right positions of the bounce restricting groove 37 of the mirror position control lever 30 and the bounce restricting projection 47 of the rotating cam gear 40 coincide with each other, the return mirror mechanism 50 is particularly compact in the left and right direction.

Further, when the interchangeable lens barrel 11 is removed from the camera body 12, the inside of the camera body 12 is exposed to the outside through the front opening, so that the user can hold the return mirror 20 of the return mirror mechanism 50 in the shooting standby state. There is a risk of touching. However, when the return mirror mechanism 50 is in the shooting standby state, as shown in FIG. 9, the bounce restricting projection 47 of the rotating cam gear 40 has escaped from the bounce restricting groove 37 of the mirror position control lever 30. Even if the return mirror 20 is forcibly rotated, a strong force is generated between the bounce restricting projection 47 and the cam projection 35 (cam follower surface 36, end projection 38), and the mirror position control lever 30 and the rotating cam gear 40. Will not be destroyed.
Furthermore, as shown in FIG. 8, when the bounce restricting protrusion 47 enters the bounce restricting groove 37, a gap is formed between the bounce restricting protrusion 47 and both side surfaces of the bound restricting groove 37. For this reason, even if the relative position of the return mirror 20 or the mirror position control lever 30 (or the relative position of the bounce restricting groove 37 and the bounce restricting protrusion 47) is slightly deviated from the design position, the bounce restricting protrusion 47 remains in the bounce restricting groove 37. The return mirror mechanism 50 does not become unsmooth.

Further, since the inclined end face 48 is formed on the end face of the bounce restricting projection 47, the following effects can be exhibited.
That is, FIG. 10 shows the shutter button after forcibly rotating the return mirror 20 of the return mirror mechanism 50 that is in a shooting standby state when the interchangeable lens barrel 11 is removed from the camera body 12 to the non-interference position side. The state when the motor M is rotated by fully pressing is shown. Thus, when the motor M is rotated in a state where the position of the return mirror 20 is deviated from a predetermined position (interference position), the position of the front opening end of the bounce restricting groove 37 and the bounce restricting projection 47 is displaced, and as a result The inclined end surface 48 of the bounce regulating projection 47 may collide with the front surface of the end projection 38. However, even in such a case, the inclined end surface 48 that is inclined with respect to the radial direction of the rotating cam gear 40 presses the end protrusion 38 upward, and is below the end protrusion 38 (the cam follower surface 36). Pass through. Accordingly, the mirror position control lever 30 and the rotating cam gear 40 are not locked in the state shown in FIG. 10, and the return mirror mechanism 50, the image sensor 13 and the shutter 14 smoothly perform a predetermined operation thereafter.

As mentioned above, although this invention was demonstrated based on the said embodiment, this invention can be implemented, giving various changes.
For example, a groove corresponding to the bounce restricting groove 37 may be formed in the mirror support frame 22 so that the bounce restricting protrusion 47 of the rotating cam gear 40 enters the groove when the return mirror 20 rotates to the interference position. Further, a groove (corresponding to the second bound restricting portion in claim 1) is formed in the rotating cam gear 40, and the mirror position control lever 30 or the mirror support frame 22 is equivalent to the bound restricting projection 47. You may form a protrusion (equivalent to the 1st bound control part of Claim 1).
Furthermore, the return mirror 20 is urged to the interference position side by the urging means, and the return mirror 20 is pressed upward (non-interference position side) by the mirror position control lever 30 urged by the power of the motor M. In addition, the return mirror 20 is positioned at the non-interference position when the rotating cam gear 40 is positioned at the initial position, and the first bound restricting portion and the first mirror are disposed when the return mirror 20 reaches the non-interference position. The bound of the return mirror 20 may be regulated by a two-bound regulation unit.
Furthermore, the camera body 12 can be a camera body for a silver halide camera by omitting the image sensor 13.

DESCRIPTION OF SYMBOLS 10 Digital camera 11 Interchangeable lens barrel 12 Camera body 13 Image sensor 14 Shutter 15 Prism 16 Finder window 17 Support shaft 20 Return mirror 21 Rotation support shaft 22 Mirror support frame 23 Mirror 24 Pressed protrusion 25 Stopper piece 27 Stopper 30 Mirror Position control lever (reciprocating drive member)
31 Rotation Support Shaft 32 Spring Hooking Part 33 Pressing Part 34 Boss 35 Cam Projection 36 Cam Follower Surface 37 Bound Restricting Groove (First Bound Restricting Part)
38 End projection 40 Rotating cam gear (Rotating cam member) (One-way rotating member)
41 Center shaft hole 42 Gear teeth 43 Cylindrical portion 45 Cam projection 46 Cam surface 47 Bound regulating projection (second bound regulating portion)
48 Inclined end face 50 Return mirror mechanism L Shooting lens M Motor (drive means)
O Optical axis S1 Torsion coil spring (biasing means)
S1a Winding portion S1b S1c Locking end portion S2 Torsion coil spring (biasing means)
S2a Winding part S2b S2c Locking end

Claims (7)

It can reciprocate between an interference position that reflects the light beam that has passed through the photographic lens to the viewfinder side and a non-interference position that avoids interference with the light beam, and is biased toward one of the interference position and non-interference position. Return mirror,
A stopper that restricts the return mirror from rotating beyond the other position by contacting the return mirror rotated to the other of the interference position and the non-interference position;
A unidirectional rotating member that rotates in one direction by the driving force of the driving means;
A reciprocating drive member for reciprocating the return mirror by rotation of the one-way rotating member;
A first bounce restricting portion formed on the reciprocating drive member or the return mirror;
When the return mirror formed on the one-way rotating member moves to the other position and comes into contact with the stopper, the bounce of the return mirror against the stopper comes into contact with the first bounce restricting portion to reach a predetermined range. A second bound regulation section that regulates within,
A return mirror mechanism for a single-lens reflex camera. In the return mirror mechanism of the single-lens reflex camera according to claim 1,
The unidirectional rotating member is a rotating cam member having a cam surface and rotating in one direction by the driving force of the driving means and positioned at an initial position when the driving means stops;
The reciprocating drive member includes a cam follower surface that comes into contact with the cam surface of the rotating cam member by an urging force of an urging means, and the contact position of the cam follower surface with the cam surface is rotated with the rotation of the rotating cam member. By changing, a mirror position control lever that alternately moves between a rotation allowable position that allows the return mirror to rotate to the one position and a maximum pressing position that presses the return mirror to the other position. Return mirror mechanism of a single-lens reflex camera. In the return mirror mechanism of the single-lens reflex camera of Claim 1 or 2,
The second bound restricting portion is a return mirror mechanism of a single-lens reflex camera that contacts the first bound restricting portion when the rotating cam member is located at a position other than the initial position. In the return mirror mechanism of the single-lens reflex camera of Claim 2 or 3,
In the camera body to which the photographing lens can be attached and detached, the return mirror, the stopper, the rotating cam member, the mirror position control lever, the first bound restricting portion, and the second bound restricting portion are provided.
A return mirror mechanism of a single-lens reflex camera in which the engagement of the first bound restricting portion and the second bound restricting portion is disabled when the rotating cam member is located at the initial position. In the return mirror mechanism of the single-lens reflex camera of any one of Claim 1 to 4,
One of the first bound restricting portion and the second bound restricting portion is a bound restricting protrusion formed on one of a mirror position control lever or a return mirror and the rotating cam member,
The side surface of the bounce regulating groove through which the bounce regulating projection can pass, the other of the first bounce regulating portion and the second bounce regulating portion being formed on the other of the mirror position control lever or the return mirror and the rotating cam member. The return mirror mechanism of a single-lens reflex camera. In the return mirror mechanism of the single-lens reflex camera according to claim 5,
A return mirror mechanism of a single-lens reflex camera in which a gap is formed between a side surface of the bound restriction groove and the bound restriction protrusion when the bound restriction protrusion is positioned inside the bound restriction groove. In the return mirror mechanism of the single-lens reflex camera of Claim 5 or 6,
A return mirror mechanism for a single-lens reflex camera, wherein an end surface on the rotational direction side of the rotating cam member at the bound regulating protrusion is an inclined end surface that is inclined with respect to the radial direction of the rotating cam member.

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