JP2015108783A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of suppressing a rebound at both ends of an actuation end of a mirror member by one inertial member without adding a new inertial member and reducing a moving speed of the mirror member.SOLUTION: The imaging device includes: a mirror member rotatable between a first position and a second position; an inertial member rotationally driven by colliding against the mirror member when the mirror member arrives at the second position from the first position; an inter-locking member for transferring a momentum of the mirror member to an inertial member by colliding against the mirror member when the mirror member arrives at the first position from the second position.

Description

  The present invention relates to an imaging apparatus.

  Conventionally, in an imaging apparatus such as a single-lens reflex camera, a quick return mirror mechanism has been devised that rotates a main mirror and a sub mirror at high speeds in and out of an optical path (imaging optical path) of an imaging optical system. When continuous shooting is performed at high speed using such a mechanism, the mirror bounces at the entrance position or retracted position of the imaging optical path, and focus detection and photometry cannot be performed correctly, and part of the captured image is in the shadow of the mirror. There was a risk of chipping. Therefore, it is necessary to start exposure for focus detection, photometry, or photographing after waiting for the bounce of the mirror to converge, which has been an obstacle for performing continuous photographing at high speed.

  Therefore, Patent Document 1 discloses a mirror bounce prevention mechanism that prevents a mirror from bouncing by causing the mirror being driven to collide with another rotatable inertia member at the drive end to absorb the momentum of the mirror. Has been.

  In the camera disclosed in Patent Document 2, when the mirror is positioned between the intermediate position between the retracted position and the intrusion position and the retracted position, a biasing force is applied in the direction of the intrusion position, so that the intermediate position and the intrusion position are When it is located between the two, an urging force is applied in the direction of the retracted position. By doing so, it is possible to suppress the occurrence of impact and sound due to collision both when moving from the entry position to the retracted position and when moving from the retracted position to the entry position.

JP 09-274249 A Japanese Patent Laid-Open No. 10-339913

  In Patent Document 1, an inertia member is disposed near the entry position, but no inertia member is disposed near the retracted position. Therefore, in order to absorb the momentum of the mirror when the mirror reaches the retracted position from the entry position, it is necessary to newly arrange an inertia member near the retracted position.

  However, the inertia member requires an appropriate inertial mass in order to sufficiently obtain the effect of absorbing the momentum of the mirror, and the distance between the center of rotation and the center of gravity of the inertia member in order to suppress individual variations. Needs to be set longer. Furthermore, there is a space where the inertia member rotates in a position where it escapes from the locus of the mirror after absorbing the momentum of the mirror, and a space for arranging a mechanism for converting the momentum transferred to the inertia member into frictional heat and sound to attenuate it. I need it. That is, a large space is required near the retreat position, and the camera weight increases. Generally, since an optical finder unit is disposed near the retracted position of the mirror, it is difficult to prepare another inertia member and its rotation space in the vicinity thereof.

  Further, a sub-mirror for guiding the light beam to the focus detection device is disposed at the rear of the mirror box at the entry position of the mirror. Behind the mirror box are an image sensor such as a CMOS or a CCD, and a shutter device for controlling the exposure amount and preventing dust and the like from adhering to the image sensor. Therefore, it is difficult to separately arrange an inertia member for suppressing the bounce of the sub mirror.

  In Patent Document 2, it is possible to alleviate the mirror drive impact at both the intrusion position and the retracted position, and to suppress mirror bounce. However, since the movement speed of the mirror is reduced when the mirror reaches the destination position, the start timing of focus detection, photometry, exposure, etc. is delayed, and as a bounce suppression effect for continuous shooting at high speed Was insufficient.

  In view of such a problem, the present invention can suppress the bounce at both ends of the working end of the mirror member with one inertia member without adding a new inertia member or reducing the moving speed of the mirror member. An object is to provide an imaging device.

  An imaging apparatus according to an aspect of the present invention includes a mirror member that is rotatable between a first position and a second position, and the mirror member has reached the second position from the first position. And an inertia member that rotates by colliding with the mirror member, and a momentum of the mirror member by colliding with the mirror member when the mirror member reaches the first position from the second position. And an interlocking member for transmitting to the inertia member.

  According to the present invention, it is possible to provide an imaging apparatus capable of suppressing the bounce at both ends of the mirror member with one inertia member without adding a new inertia member or reducing the moving speed of the mirror member. Can do.

It is a side view of an imaging device concerning an embodiment of the present invention. It is a cross-sectional side view of the quick return mirror unit according to the first embodiment. It is a cross-sectional side view of the bounce suppression unit of Example 1. It is a cross-sectional side view of the quick return mirror unit of Examples 2 and 3. It is a cross-sectional side view of the bounce suppression unit of Example 2. It is a cross-sectional side view of the bounce suppression unit of Example 3.

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

  With reference to FIG. 1, the configuration of the entire imaging apparatus according to the present embodiment will be described. FIG. 1 is a side view of an imaging apparatus according to an embodiment of the present invention.

  The camera system according to this embodiment includes a digital single-lens reflex camera (hereinafter referred to as a camera) 1 and a photographing lens (interchangeable lens) 2 that is detachably attached to the camera 1.

  The mirror box 3 is a box-shaped member having a quick return mirror unit (mirror member) to be described later. The optical finder unit 6 is provided for observing a subject image, and includes a pentaprism 6a and a photometric device 6b. The focus detection device 7 detects the defocus amount of the photographing lens 2 by measuring the distance to the subject, and calculates a lens driving amount for bringing the photographing lens 2 into a focused state. A shutter device 8 and an imaging unit 9 are disposed behind the mirror box 3. The imaging unit 9 includes an imaging element such as a CMOS sensor or a CCD sensor, a film, a holding member, various filters, and the like.

  First, the configuration of the quick return mirror unit of this embodiment will be described. FIG. 2 is a cross-sectional side view of a quick return mirror unit (hereinafter referred to as a mirror member) 4 of the present embodiment.

  The mirror member 4 includes a main mirror 41 and a sub mirror 43. The mirror member 4 is provided in the mirror box 3 so as to be rotatable between an intrusion position that has entered the imaging optical path and a retracted position that has been retracted outside the imaging optical path. It is attached.

  The main mirror 41 is constituted by a half mirror, and is fixed to a main mirror holding member 42 having an opening. The main mirror holding member 42 is attached to the mirror box 3 so as to be rotatable about a rotation shaft 42a.

  The sub mirror 43 is fixed to the sub mirror holding member 44. The sub mirror holding member 44 is rotatably attached to the main mirror holding member 42 around the rotation shaft 44a of the main mirror holding member 42.

  When the main mirror 41 is located at the entry position, the main mirror 41 reflects a part of the light beam from the photographing optical system and guides it to the optical finder unit 6. Thereby, the photographer can observe the subject image through the optical viewfinder unit 6. Further, the remaining light flux is transmitted through the opening of the main mirror holding member 42. The sub mirror 43 guides the light beam from the opening of the main mirror holding member 42 to the focus detection device 7. At this time, the main mirror 41 and the sub mirror 43 are urged to rotate counterclockwise in the drawing around the rotation shafts 42a and 44a, respectively.

  At the time of shooting, the switching device (not shown) causes the main mirror 41 and the sub mirror 43 to be rotated in the clockwise direction in the drawing about the rotation shafts 42a and 44a, respectively, and move to the retracted position. When the mirror member 4 is located at the retracted position, the sub mirror holding member 44 is substantially parallel to the main mirror 41 so as to close the opening of the main mirror holding member 42. Therefore, the photographing light beam formed by the photographing optical system is guided to the imaging unit 9. Further, since the opening of the main mirror holding member 42 is closed, the reverse incident light from the optical finder unit 6 is not incident on the mirror box 3.

  When the photographing is finished, the main mirror 41 and the sub mirror 43 are urged to rotate counterclockwise in the drawing around the rotation shafts 42a and 44a by the switching device (not shown) and move to the intrusion position.

  Next, the configuration of the bound suppression unit will be described with reference to FIG. FIG. 3 is a cross-sectional side view of the bounce suppression unit 5 of the present embodiment. In the present embodiment, the bounce suppression unit 5 is disposed on the right side when viewed from the subject side of the mirror box 3.

  The shaft 51a of the interlocking lever 51 (interlocking member) is rotatably attached to the mirror box 3 and is in the vicinity of a straight line connecting the tip of the main mirror holding member 42 and the rotating shaft 42a when positioned at the retracted position. Has been placed.

  The receiving pin 51 b of the interlocking lever 51 is provided so as to protrude into the mirror box 3. The receiving pin 51b is fixed so as to enter on the rotation trajectory of the main mirror holding member 42, and comes into contact with the main mirror holding member 42 when located at the retracted position.

  The toggle spring 54 (first urging member) is hung on the pin 31 fixed to the interlocking lever 51 and the mirror box 3. The toggle spring 54 urges the interlocking lever 51 counterclockwise in the drawing so as to contact the eccentric pin 32 pivotally supported by the mirror box 3. At this time, the force that the toggle spring 54 urges the interlocking lever 51 to the eccentric pin 32 is larger than the rotational urging force that is applied to the main mirror holding member 42 at the retracted position.

  Further, by rotating the eccentric pin 32, the retracted position of the mirror member 4 can be finely adjusted. As a result, the mirror member 4 can be stopped in a region where the photographing light flux is not inhibited during photographing.

  The balancer (inertial member) 55 has an inertial mass that reduces the bounce time of the mirror member 4. The shaft 55a of the balancer 55 is rotatably attached to the mirror box 3, and is disposed in the vicinity of a straight line connecting the tip of the main mirror holding member 42 when located at the entry position and the rotation shaft 42a. Yes.

  The receiving pin 55 b of the balancer 55 is provided so as to protrude into the mirror box 3. The receiving pin 55b is fixed so as to enter on the trajectory of the main mirror holding member 42, and is in contact with the main mirror holding member 42 when it is located at the entry position.

  A toggle spring (second urging member) 57 is hung on a pin 33 fixed to the balancer 55 and the mirror box 3. The toggle spring 57 urges the balancer 55 in the clockwise direction in the drawing so as to contact the eccentric pin 34 pivotally supported by the mirror box 3. At this time, the force with which the toggle spring 57 urges the balancer 55 against the eccentric pin 34 is larger than the rotational urging force applied to the main mirror holding member 42 at the entry position.

  Further, by rotating the eccentric pin 34, the angle of the main mirror holding member 42 with respect to the optical axis at the entry position can be finely adjusted. Thereby, since the optical axis angle of the light beam incident on the optical finder unit 6 can be adjusted, the deviation between the subject image observed by the photographer through the optical finder unit 6 and the subject image taken by the imaging unit 9 can be reduced. Can do.

  The balancer driving roller 52 pivotally supports an eccentric shaft (gap adjusting member) 51 c fixed to the interlocking lever 51. As will be described later, the balancer driving roller 52 presses the driven portion 55c of the balancer 55 when rotating, and rotationally drives the balancer 55 against the urging force of the toggle spring 57.

  A gap is formed between the driven portion 55c and the balancer drive roller 52 in a steady state so that the driven portion 55c and the balancer drive roller 52 do not stretch when the eccentric pins 32 and 34 are adjusted. In this embodiment, since the amount of gap can be adjusted by the eccentric shaft 51c, the time until the mirror member 4 collides with the interlocking lever 51 and the interlocking lever 51 presses and drives the balancer 55, and the rotation of the interlocking lever 51 is performed. You can manage the moving angle. Therefore, variation in the bounce time of each product can be reduced.

  An impact absorbing rubber 58 that is an elastic member is fixed to the mirror box 3. The shock absorbing rubber 58 collides with the wall portion 55 d of the balancer 55 when the balancer 55 rotates counterclockwise against the rotational biasing force of the toggle spring 57. As a result, the rotation range of the balancer 55 is restricted and the momentum of the balancer 55 is absorbed. As a material of the shock absorbing rubber 58, butyl rubber or chloroprene rubber is suitable.

  Next, the operation of the mirror member 4 and the bounce suppression unit 5 of this embodiment will be described.

  FIG. 3A shows a state when the mirror member 4 is located at the entry position. When shooting is started, through a predetermined sequence, the main mirror holding member 42 and the sub mirror holding member 44 rotate clockwise about the rotation shaft 42a and the rotation shaft 44a to the retracted position, The state shown in FIG.

  When the main mirror holding member 42 and the sub mirror holding member 44 reach the retracted position, the main mirror holding member 42 collides with the receiving pin 51b of the interlocking lever 51. At this time, the interlocking lever 51 is rotationally driven around the shaft 51a in the clockwise direction, that is, in the direction against the urging force of the toggle spring 54. When the interlocking lever 51 is rotated by a predetermined angle, the balancer driving roller 52 collides with the driven portion 55c of the balancer 55 as shown in FIG. Here, the momentum possessed by the mirror member 4 is transmitted as the momentum of the balancer 55. At this time, as shown in FIG. 3D, the balancer 55 is rotationally driven around the shaft 55a in the counterclockwise direction, that is, in the direction against the urging force of the toggle spring 57.

  The kinetic energy received by the balancer 55 is attenuated by the collision between the shock absorbing rubber 58 and the balancer 55 and the friction between the balancer 55 and the shaft 55a. On the other hand, since the mirror member 4 including the main mirror holding member 42 has transferred its momentum to the balancer 55, it eventually stops rotating in the clockwise direction. Thereafter, the mirror member 4 is rotationally driven counterclockwise by the receiving pin 51b of the interlocking lever 51, and the interlocking lever 51 is in contact with the receiving pin 51b at a position regulated by the eccentric pin 32, while FIG. ).

  When the exposure is completed through a predetermined sequence in the state shown in FIG. 3E, which is the retracted position, the main mirror holding member 42 rotates counterclockwise about the rotation shaft 42a, and enters the entry position from the retracted position. Return to. In conjunction with the return operation of the main mirror holding member 42, the sub mirror holding member 44 also rotates counterclockwise about the rotation shaft 44a and returns from the retracted position to the entry position.

  When the main mirror holding member 42 and the sub mirror holding member 44 reach the intrusion position, the main mirror holding member 42 collides with the receiving pin 55b fixed to the balancer 55. Here, the momentum possessed by the mirror member 4 is transmitted as the momentum of the balancer 55. At this time, as shown in FIG. 3 (f), the balancer 55 is rotationally driven around the shaft 55 a in the counterclockwise direction, that is, in the direction against the urging force of the toggle spring 57.

  The kinetic energy received by the balancer 55 is attenuated by the collision between the shock absorbing rubber 58 and the balancer 55 and the friction between the balancer 55 and the shaft 55a. On the other hand, since the mirror member 4 including the main mirror holding member 42 has transferred its momentum to the balancer 55, it eventually stops rotating in the counterclockwise direction. Thereafter, the balancer 55 is rotated in the clockwise direction by the receiving pin 55b of the balancer 55, and stops in the state shown in FIG. 3A while contacting the receiving pin 55b at the position regulated by the eccentric pin 34.

  As described above, according to this embodiment, the balancer 55 is directly driven by the main mirror holding member 42 at the intrusion position. On the other hand, at the retracted position, the same balancer 55 is driven via the interlocking lever 51. For this reason, the bounce time of the main mirror 41 and the main mirror holding member 42 at both positions can be shortened without arranging a plurality of inertia members having appropriate inertia masses and sizes at the entry position and the retreat position. it can. Moreover, since the bounce time of the main mirror holding member 42 is shortened, the bounce time of the sub mirror holding member 44 and the sub mirror 43 that are pivotally supported by the main mirror holding member 42 can also be shortened. Thereby, reduction of mass and effective utilization of space can be aimed at.

  Further, when the mirror member 4 moves from the entry position to the retracted position or from the retracted position to the entry position, the bounce time of the mirror member 4 can be reduced without reducing the speed.

  In the present embodiment, the bounce suppression unit 5 is used for suppressing the bounce of the main mirror 41, but may be used for suppressing the bounce of the sub mirror 43. Further, a plurality of the mirrors may be arranged to suppress the bounding of both the main mirror 41 and the sub mirror 43.

  In the retracted position, the main mirror holding member 42 is driven so as to collide with the receiving pin 51 b of the interlocking lever 51 and deliver the momentum of the mirror member 4 to the balancer 55. At the intrusion position, the receiving pin 55b of the balancer 55 may collide with the sub mirror holding member 44 and may act to suppress the bounce of the sub mirror holding member 44, or vice versa.

  This embodiment is different from the first embodiment in the configuration of the quick return mirror unit and the bounce suppression unit. Other configurations are the same as those in the first embodiment, and thus the description thereof is omitted.

  First, the configuration of the quick return mirror unit of this embodiment will be described. FIG. 4 is a side sectional view of a quick return mirror unit (hereinafter referred to as a mirror member) 14 of this embodiment.

  The mirror member 14 includes a main mirror 141 and a sub mirror 143. The mirror member 14 is provided in the mirror box 3 so as to be rotatable between an intrusion position that has entered the imaging optical path and a retracted position that has been retracted outside the imaging optical path. It is attached.

  The main mirror 141 is a half mirror, and is fixed to a main mirror holding member 142 having an opening. The main mirror holding member 142 is attached to the mirror box 3 so as to be rotatable about a rotation shaft 142a.

  The sub mirror 143 is fixed to the sub mirror holding member 144. The sub mirror holding member 144 is attached to the sub mirror drive lever 145 so as to be rotatable about the rotation shaft 144 a of the sub mirror drive lever 145. The sub mirror drive lever 145 is attached to the mirror box 3 so as to be rotatable about a rotation shaft 145a. The sub mirror drive lever 145 rotates the sub mirror holding member 144 and the sub mirror 143 between an intrusion position where the sub mirror holding member 144 and the sub mirror 143 have entered the imaging optical path and a retreat position which is retracted outside the imaging optical path. At the intrusion position, the sub mirror holding member 144 is opened at a predetermined angle with respect to the sub mirror drive lever 145.

  When the main mirror 141 is located at the entry position, the main mirror 141 reflects a part of the light beam from the photographing optical system and guides it to the optical viewfinder unit 6. Thereby, the photographer can observe the subject image through the optical viewfinder unit 6. Further, the remaining light flux is transmitted through the opening of the main mirror holding member 142. The sub mirror 143 guides the light beam from the opening of the main mirror holding member 142 to the focus detection device 7. At this time, the sub mirror holding member 144 is urged to rotate in the clockwise direction in the drawing with respect to the rotation shaft 144a about the rotation shaft 144a, and the sub mirror driving lever 145 is counterclockwise in the drawing about the rotation shaft 145a. It is urged to rotate clockwise.

  At the time of shooting, a switching device (not shown) first causes the sub mirror drive lever 145 to be urged to rotate clockwise about the rotation shaft 145a and starts to move to the retracted position. Thereafter, the sub mirror holding member 144 is urged to rotate counterclockwise about the rotation shaft 144a and moved to the retracted position. When the sub mirror 143 is positioned at the retracted position, the sub mirror holding member 144 is substantially parallel to the sub mirror drive lever 145 so as to cover the focus detection device 7. Therefore, the photographing light beam formed by the photographing optical system is guided to the imaging unit 9. Further, since the focus detection device 7 is covered, a part of the photographing light beam does not enter the focus detection device 7 and the reflected light from the focus detection device 7 does not enter the mirror box 3.

  When shooting is completed, the sub mirror holding member 144 is urged to rotate clockwise about the rotation shaft 144a by a switching device (not shown). Thereafter, the sub mirror drive lever 145 is urged to rotate counterclockwise about the rotation shaft 145a, and the sub mirror 143 moves to the intrusion position.

  Next, a configuration different from the first embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional side view of the bounce suppression unit 15 of the present embodiment. In the present embodiment, the bounce suppression unit 15 is disposed on the right side when viewed from the subject side of the mirror box 3.

  The shaft 151a of the interlocking lever (interlocking member) 151 is rotatably attached to the mirror box 3, and is in the vicinity of a straight line connecting the tip of the sub mirror holding member 144 and the rotating shaft 144a when positioned at the intrusion position. Is arranged.

  The receiving pin 151 b of the interlocking lever 151 is provided so as to protrude into the mirror box 3. The receiving pin 151b is fixed so as to enter on the rotation trajectory of the sub mirror holding member 144, and is in contact with the sub mirror holding member 144 when positioned at the intrusion position.

  A toggle spring (first urging member) 154 is hung on a pin 131 fixed to the interlocking lever 151 and the mirror box 3. The toggle spring 154 urges the interlocking lever 151 in the counterclockwise direction in the drawing so as to contact the eccentric pin 132 pivotally supported by the mirror box 3. At this time, the force with which the toggle spring 154 urges the interlocking lever 151 toward the eccentric pin 132 is larger than the clockwise urging force applied to the sub mirror holding member 144 at the entry position.

  Further, the intrusion position of the mirror member 14 can be finely adjusted by rotating the eccentric pin 132. Thereby, the optical axis angle of the imaging light beam incident on the focus detection device 7 can be adjusted, and the focus detection accuracy can be improved.

  The balancer (inertia member) 155 has an inertial mass that reduces the bounce time of the mirror member 14. Since the side surface of the focus detection device 7 generally has a large space available for the configuration of the camera, the space for arranging the balancer 155 and the rotation space, and the space for arranging the mechanism for attenuating the momentum of the balancer 155. Can be used efficiently. Therefore, the balancer 155 is arranged on the side surface of the focus detection device 7.

  The shaft 155a of the balancer 155 is rotatably attached to the mirror box 3, and is disposed in the vicinity of a straight line connecting the tip of the sub mirror holding member 144 when it is located at the retracted position and the rotation shaft 144a. .

  The receiving pin 155 b of the balancer 155 is provided so as to protrude into the mirror box 3. The receiving pin 155b is fixed so as to enter on the rotation trajectory of the sub mirror holding member 144, and is in contact with the sub mirror holding member 144 when located at the retracted position.

  A toggle spring (second urging member) 157 is hung on a pin 133 fixed to the balancer 155 and the mirror box 3. The toggle spring 157 biases the balancer 155 in the clockwise direction in the drawing so as to contact the eccentric pin 134 pivotally supported by the mirror box 3. At this time, the force by which the toggle spring 157 urges the balancer 155 to the eccentric pin 134 is the counterclockwise rotational urging force applied to the sub mirror holding member 144 at the retracted position and the clock applied to the sub mirror drive lever 145. It is larger than the resultant force of the rotational urging force in the rotation direction.

  Further, by rotating the eccentric pin 134, the retracted position of the mirror member 14 can be finely adjusted. Accordingly, the focus detection device 7 is not disturbed by the mirror member 14 during photographing, and the focus detection device 7 is prevented from entering a part of the photographing light flux into the focus detection device 7 or reflected light entering the mirror box 3. It can be stopped in the area where the cover is shielded from light.

  Next, the operation of the mirror member 14 and the bounce suppression unit 15 of this embodiment will be described.

  FIG. 5A shows a state when the mirror member 14 is located at the entry position. When photographing is started, through a predetermined sequence, the sub mirror drive lever 145 is urged to rotate clockwise about the rotation shaft 145a and starts to rotate in the rotation direction toward the retracted position. Thereafter, a rotational urging force is applied to the sub mirror holding member 144 in the counterclockwise direction in the drawing around the rotation shaft 144a, and the sub mirror holding member 144 is driven to the retracted position as shown in FIG. 5B. .

  As shown in FIG. 5C, when the sub mirror holding member 144 reaches the retracted position, the sub mirror holding member 144 collides with the receiving pin 155b of the balancer 155. Here, the momentum held by the mirror member 14 is transmitted as the momentum of the balancer 155. As shown in FIG. 5D, the balancer 155 is rotationally driven around the shaft 155a in the counterclockwise direction, that is, in the direction against the urging force of the toggle spring 157.

  The kinetic energy received by the balancer 155 is attenuated by the collision between the shock absorbing rubber 158 and the balancer 155 and the friction between the balancer 155 and the shaft 155a. On the other hand, since the mirror member 14 including the sub mirror holding member 144 has transferred its momentum to the balancer 155, the mirror member 14 stops rotating in the counterclockwise direction. Thereafter, the mirror member 14 is driven to rotate clockwise by the receiving pin 155b of the balancer 155, and the balancer 155 is in contact with the receiving pin 155b at a position regulated by the eccentric pin 134, and the state shown in FIG. Stop at.

  When the exposure is completed through a predetermined sequence in the state of FIG. 5E that is the retracted position, the sub mirror holding member 144 starts to rotate clockwise around the rotation shaft 144a. Next, the sub mirror drive lever 145 rotates counterclockwise about the rotation shaft 145a, and returns the mirror member 14 from the retracted position to the intrusion position.

  When the sub mirror holding member 144 reaches the intrusion position, the sub mirror holding member 144 collides with the receiving pin 151b of the interlocking lever 151. At this time, the interlocking lever 151 is rotationally driven around the shaft 151a in the clockwise direction, that is, in the direction against the urging force of the toggle spring 154. When the interlocking lever 151 is driven to rotate by a predetermined angle, the balancer driving roller 152 collides with the driven portion 155c of the balancer 155 as shown in FIG. Here, the momentum held by the mirror member 14 is transmitted as the momentum of the balancer 155, and as shown in FIG. 5G, the balancer 155 rotates counterclockwise around the shaft 155a, that is, the toggle spring 157 is attached. It is driven to rotate in the direction against the force.

  The kinetic energy received by the balancer 155 is attenuated by the collision between the shock absorbing rubber 158 and the balancer 155 and the friction between the balancer 155 and the shaft 155a. On the other hand, since the mirror member 14 including the sub mirror holding member 144 has transferred its momentum to the balancer 155, it eventually stops rotating in the clockwise direction. Thereafter, the interlocking lever 151 is rotated counterclockwise by the receiving pin 151b of the interlocking lever 151, and the interlocking lever 151 stops in the state shown in FIG. 5A while contacting the receiving pin 151b at a position regulated by the eccentric pin 132. .

  As described above, according to the present embodiment, the balancer 155 is directly driven by the sub mirror holding member 144 at the retracted position. On the other hand, at the intrusion position, the same balancer 155 is driven via the interlocking lever 151. For this reason, the bounce time of the mirror member 14 at both positions can be shortened without arranging a plurality of inertia members having appropriate inertia masses and sizes at the intrusion position and the retreat position. Space can be used effectively.

  Further, when the mirror member 14 moves from the intrusion position to the retracted position or from the retracted position to the intrusion position, the bounce time of the mirror member 14 can be reduced without reducing the speed.

  The present embodiment differs from the second embodiment in the configuration of the bounce suppression unit. Other configurations are the same as those in the second embodiment, and thus the description thereof is omitted.

  First, the structure of the bound suppression unit 25 of a present Example is demonstrated. FIG. 6 is a cross-sectional side view of the bounce suppression unit 25 of the present embodiment. In this embodiment, the bounce suppression unit 25 is disposed on the right side when viewed from the subject side of the mirror box 3.

  The shaft 251a of the interlocking lever (interlocking member) 251 is rotatably attached to the mirror box 3, and is in the vicinity of a straight line connecting the tip of the sub mirror holding member 144 and the rotating shaft 144a when positioned at the intrusion position. Is arranged.

  The receiving pin 251 b of the interlocking lever 251 is provided so as to protrude into the mirror box 3. The receiving pin 251b is fixed so as to enter on the rotation trajectory of the sub mirror holding member 144, and is in contact with the sub mirror holding member 144 when positioned at the intrusion position.

  The tension coil spring (third urging member) 254 has a first end hooked to a connecting spring hooking portion 251d of the interlocking lever 251 and a second end hooked to a connecting spring hooking pin 255e fixed on the balancer 255. The tension coil spring 254 biases the interlocking lever 251 in the counterclockwise direction in the drawing so as to contact the eccentric pin 132 pivotally supported by the mirror box 3. Further, the tension coil spring 254 biases the balancer 255 in the clockwise direction in the drawing so as to contact the eccentric pin 134 pivotally supported by the mirror box 3.

  The adjustment spring (biasing force adjustment member) 257 has a first end hooked to the interlocking lever 251 and a second end fixed to the mirror box 3. The adjustment spring 257 biases the interlocking lever 251 in the clockwise direction with a force weaker than the force by which the tension coil spring 254 rotates and biases the interlocking lever 251 in the counterclockwise direction. Therefore, the adjustment spring 257 can adjust the force with which the tension coil spring 254 biases the interlocking lever 251 in the counterclockwise direction.

  Further, the force by which the tension coil spring 254 biases the interlocking lever 251 to the eccentric pin 132 is the sum of the clockwise rotation biasing force applied to the sub mirror holding member 144 at the intrusion position and the force of the adjustment spring 257. Is also big.

  The balancer (inertial member) 255 is disposed on the side surface of the focus detection device 7 and has an inertial mass that reduces the bounce time of the mirror member 14. A shaft 255a of the balancer 255 is rotatably attached to the mirror box 3, and is arranged in the vicinity of a straight line connecting the tip of the sub mirror holding member 144 at the retracted position and the rotating shaft 144a.

  The receiving pin 255 b of the balancer 255 is provided so as to protrude into the mirror box 3. The receiving pin 255b is fixed so as to enter on the rotation trajectory of the sub mirror holding member 144, and is in contact with the sub mirror holding member 144 when positioned at the retracted position. The force that the tension coil spring 254 urges the balancer 255 to the eccentric pin 134 is the counterclockwise rotation urging force applied to the sub mirror holding member 144 at the retracted position and the clockwise rotation applied to the sub mirror drive lever 145. Greater than the combined force of the energizing forces.

  Next, the operation of the mirror member 14 and the bounce suppression unit 25 of this embodiment will be described.

  FIG. 6A shows a state when the mirror member 14 is located at the entry position. When photographing is started, through a predetermined sequence, the sub mirror drive lever 145 is urged to rotate clockwise about the rotation shaft 145a and starts to rotate in the rotation direction toward the retracted position. Thereafter, a rotational urging force is applied to the sub mirror holding member 144 in the counterclockwise direction around the rotation shaft 144a, and the sub mirror holding member 144 is also driven to the retracted position.

  As shown in FIG. 6B, when the sub mirror holding member 144 reaches the retracted position, the sub mirror holding member 144 collides with the receiving pin 255b of the balancer 255. Here, the momentum of the mirror member 14 is transmitted as the momentum of the balancer 255. As shown in FIG. 6C, the balancer 255 is rotationally driven about the shaft 255a in the counterclockwise direction, that is, in the direction against the urging force of the tension coil spring 254.

  At this time, the first end of the tension coil spring 254 is hooked on the connecting spring hooking portion 251 d of the interlocking lever 251, but the interlocking lever 251 is in contact with the eccentric pin 132. Therefore, even if the tension coil spring 254 is pulled by the balancer 255, the interlocking lever 251 does not rotate counterclockwise. Therefore, when the mirror member 14 reaches the retracted position, the first end of the tension coil spring 254, that is, the connecting spring hooking portion 251d of the interlocking lever 251 acts as a fixed end. Since the subsequent operation of the balancer 255 is the same as that of the second embodiment, a description thereof will be omitted.

  In the state shown in FIG. 6D, which is the retracted position, when the exposure is completed through a predetermined sequence, the sub mirror holding member 144 starts to rotate clockwise around the rotation shaft 144a. Next, the sub mirror drive lever 145 rotates counterclockwise about the rotation shaft 145a, and returns the mirror member 14 from the retracted position to the intrusion position.

  When the sub mirror holding member 144 reaches the intrusion position, the sub mirror holding member 144 collides with the receiving pin 251b of the interlocking lever 251. At this time, the interlocking lever 251 is rotationally driven around the shaft 251a in the clockwise direction, that is, in the direction against the urging force of the tension coil spring 254. At this time, the first end of the tension coil spring 254 is hooked on the connecting spring hook pin 255e of the balancer 255. For this reason, the balancer 255 abuts on the eccentric pin 134 and the operation in the clockwise direction is restricted, so that the connecting spring hook pin 255e acts as a fixed end.

  When the interlocking lever 251 is driven to rotate by a predetermined angle, the balancer driving roller 252 collides with the driven portion 255c of the balancer 255 as shown in FIG. Here, the momentum of the mirror member 14 is transmitted as the momentum of the balancer 255. At this time, as shown in FIG. 6F, the balancer 255 is rotationally driven around the shaft 255a in the counterclockwise direction, that is, in the direction against the urging force of the tension coil spring 254. Since the tension coil spring 254 is pulled by the balancer 255, the connecting spring hooking portion 251d of the interlocking lever 251 that is the first end is pulled to rotate the interlocking lever 251 in the counterclockwise direction. Eventually, the interlocking lever 251 abuts on the eccentric pin 132, and the connecting spring hook 251d acts as a fixed end.

  Subsequent operations of the balancer 255 and the interlocking lever 251 are the same as those in the second embodiment, and will be omitted.

  As described above, according to the present embodiment, the balancer 155 is directly driven by the main mirror holding member 142 at the retracted position. On the other hand, at the intrusion position, the same balancer 155 is driven via the interlocking lever 151. For this reason, the bounce time of the mirror member 14 at both positions can be shortened without arranging a plurality of inertia members having appropriate inertia masses and sizes at the intrusion position and the retreat position. Space can be used effectively.

  Further, when the mirror member 14 moves from the intrusion position to the retracted position or from the retracted position to the intrusion position, the bounce time of the mirror member 14 can be reduced without reducing the speed.

  Further, in order to more efficiently transfer the momentum of the mirror member 14 to the balancer 255 at the intrusion position, it is preferable to reduce the counterclockwise reaction force applied to the mirror member 14 at the time of collision. In this embodiment, the same tension coil spring 254 is arranged so as to connect both the interlocking lever 251 and the balancer 255. Therefore, the counterclockwise reaction force that the mirror member 14 receives from the interlocking lever 251 and the balancer 255 at the intrusion position can be reduced from the configuration of the other embodiment in which the interlocking lever 251 and the balancer 255 are independently biased. it can.

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

  For example, in each of the embodiments, the bounce suppression unit is disposed only on the right side of the mirror box as viewed from the subject side. You may make it the structure which arrange | positions on both right-and-left both sides | surfaces, and suppresses the variation in the bounce in the right-and-left both ends of a mirror member.

  Moreover, each interlocking lever of Examples 1-3 is arrange | positioned only at the one side of a retracted position and an intrusion position. However, separate interlocking levers may be disposed on both sides of the retracted position and the intrusion position, and one balancer may be driven by each interlocking lever when the mirror member reaches each position.

4, 14 Quick return mirror unit (mirror member)
51, 151, 251 Interlocking lever (interlocking member)
55, 155, 255 Balancer (Inertial member)

Claims (10)

A mirror member rotatable between a first position and a second position;
An inertia member that rotates when the mirror member collides with the mirror member when the mirror member reaches the second position from the first position;
And an interlocking member that transmits the momentum of the mirror member to the inertia member by colliding with the mirror member when the mirror member reaches the first position from the second position. An imaging device. A first urging member that urges the interlocking member in a first rotation direction that is a rotation direction from the first position to the second position of the mirror member;
A second urging member that urges the inertia member in a second rotation direction that is a rotation direction of the mirror member from the second position to the first position. The imaging device according to claim 1.   The interlocking member is urged in a first rotation direction that is a rotation direction from the first position to the second position of the mirror member, and the first position from the second position of the mirror member is The imaging apparatus according to claim 1, further comprising a third urging member that urges the inertia member in a second rotation direction that is a rotation direction to the position of the image pickup apparatus.   The imaging apparatus according to any one of claims 1 to 3, wherein the interlocking member regulates a rotation angle of the mirror member.   5. The imaging apparatus according to claim 1, further comprising a gap adjusting member capable of adjusting a gap between the interlocking member and the inertia member.   The biasing force adjusting member that biases the interlocking member in the second rotation direction and adjusts the biasing force of the third biasing member to the interlocking member is provided. The bounce suppressing device according to any one of 5.   The bound suppression device according to claim 1, wherein the inertia member is disposed on both side surfaces of the mirror member across an optical axis. A focus detection device for measuring a distance from a light beam reflected by the mirror member to a subject;
The bound suppression device according to any one of claims 1 to 7, wherein the inertia member is disposed on a side surface of the focus detection device. The first position is a retracted position where the mirror member is located outside the photographing optical path,
9. The imaging apparatus according to claim 1, wherein the second position is an intrusion position where the mirror member is located in the photographing optical path. The imaging device according to any one of claims 1 to 9,
An interchangeable lens that is detachably exchanged with the imaging device.