JP6679403B2 - Imaging device - Google Patents

Description

   The present invention relates to an imaging device such as a single-lens reflex camera including a mirror driving device.

  In a mirror drive device such as a single-lens reflex camera, in order to cope with the recent increase in the speed of continuous shooting, the mirror down position that guides the light flux to the finder optical system and the light flux that escapes from the photographic optical path toward the image plane side The mirror is moved forward and backward at high speed between it and the mirror up position.

  Conventionally, a technique has been proposed in which a shaft protruding from a mirror holder that holds a mirror is sandwiched by a torsion spring, and a lever that holds the torsion spring is sandwiched between two cam portions to drive the lever to move the mirror holder forward and backward at high speed. (Patent Document 1).

JP-A-7-168280

  In Patent Document 1, the torsion spring urges the mirror holder toward the mirror-down position. In this case, when the spring pressure of the torsion spring is low, the urging force on the mirror holder becomes small, and the mirror holder moves the mirror. It takes a long time to completely stop at the down position. Therefore, it becomes difficult to cope with the speeding up of continuous shooting.

  On the other hand, if the spring pressure of the torsion spring is increased, a large force is applied to the mirror holder when holding it in the mirror down position, and the mirror holder is distorted.As a result, the distortion of the finder image due to the distortion of the mirror and the focus of the finder. Distance may change.

  Therefore, it is an object of the present invention to provide a technique capable of speeding up continuous shooting by shortening the time until the driving of the mirror unit is stopped without affecting the viewfinder image or the focus distance of the viewfinder. .

  In order to achieve the above object, the image pickup apparatus of the present invention moves between a mirror-down position that enters the shooting optical path and a mirror-up position that retracts from the shooting optical path, and reflects a subject light flux at the mirror-down position. And a first cam member for driving the mirror unit from the mirror down position to the mirror up position, the mirror unit guiding the subject light flux to the image pickup means at the mirror up position. A second cam member that drives the mirror unit from the mirror-up position to the mirror-down position and the mirror unit at the mirror-down position are brought into contact with each other to restrict movement of the mirror unit in the mirror-down direction. A positioning member for positioning the mirror unit at the mirror-down position, and the second cam portion And a biasing member that biases the mirror unit abutting the positioning member toward the positioning member, the biasing member biasing the mirror unit toward the positioning member. And a second biasing region that biases the mirror unit toward the positioning member with a biasing force larger than that of the first biasing region. Until the driving of the mirror unit in the direction of the mirror down position by the second cam member is stopped, the driving is stopped by being urged toward the positioning member by the second urging region. In the state, the first biasing region is biased toward the positioning member.

  According to the present invention, it is possible to shorten the time until the drive of the mirror unit is stopped and speed up continuous shooting without affecting the finder image or the focus distance of the finder.

FIG. 1 is a schematic diagram illustrating a configuration of a digital single-lens reflex camera that is a first embodiment of an image pickup apparatus of the present invention. It is an exploded perspective view explaining composition of a mirror drive unit. It is a figure explaining a down cam gear unit. FIG. 6 is a time chart showing changes in the voltage applied to the motor, the position of the mirror holder, and the biasing force acting on the drive shaft of the mirror holder from the movable cam. It is a figure explaining operation | movement of a mirror unit, a down cam gear unit, and an up cam gear. In a digital single-lens reflex camera that is a second embodiment of the image pickup apparatus of the present invention, a time chart showing changes in the voltage applied to the motor, the position of the mirror holder, and the biasing force that acts on the drive shaft of the mirror holder from the movable cam. It is a figure. It is a figure explaining operation | movement of a mirror unit, a down cam gear unit, and an up cam gear.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic diagram illustrating the configuration of a digital single-lens reflex camera that is a first embodiment of an image pickup apparatus of the present invention. In the present embodiment, a digital single-lens reflex camera is illustrated as the imaging device, but the imaging device is not limited to this.

  In the digital single-lens reflex camera (hereinafter, referred to as a camera) of the present embodiment, as shown in FIG. 1, an interchangeable lens 200 is detachably attached to the front side of a camera body 1. A focus detection unit 31, a finder optical system 4, a mirror drive unit 1000, and an image sensor 33 are provided inside the camera body 1. The mirror drive unit 1000 reciprocates between the mirror down position (FIG. 1A) where the mirror holder 502 of the mirror unit 500 enters the shooting optical path and the mirror up position (FIG. 1B) where the mirror holder 502 retracts from the shooting optical path. To drive.

  At the mirror-down position of the mirror unit 500 shown in FIG. 1A, the subject light flux that has passed through the interchangeable lens 200 is reflected by the mirror unit 500 and guided to the pentaprism 22 of the finder optical system 4, whereby a finder image is obtained. Can be observed. On the other hand, at the mirror-up position of the mirror unit 500 shown in FIG. 1B, the light flux passing through the interchangeable lens 200 is not guided to the finder optical system 4 but is guided to the image sensor 33 to form an image, and photoelectric conversion is performed. It is output as an image signal to an image processing unit (not shown).

  FIG. 2 is an exploded perspective view illustrating the configuration of the mirror drive unit 1000. As shown in FIG. 2, the mirror driving unit 1000 includes a mirror box 400, a mirror unit 500, and a mirror driving device 600 (hereinafter referred to as a driving device 600).

  The mirror unit 500 has a mirror holder 502 that holds a mirror 501. The mirror holder 502 is provided with a rotation shaft 502a and a drive shaft 502c. The drive shaft 502c corresponds to an example of the driven portion of the present invention. The mirror holder 502 is attached to the mirror box 400 so as to receive a driving force from a motor 604, which will be described later, on a drive shaft 502c and rotate about a rotation shaft 502a between a mirror down position and a mirror up position. ing. A shaft pressing plate 402 is attached to the back surface of the mirror box 400.

  The axis pressing plate 402 is attached to the mirror box 400 in a state where the mirror holder 502 is attached to the mirror box 400, thereby pressing the rotation shaft 502a of the mirror holder 502. Thereby, the mirror holder 502 is rotatably supported with respect to the mirror box 400.

  A positioning shaft 403 is provided on one side of the mirror box 400. The mirror holder 502 comes into contact with the positioning shaft 403 at the mirror-down position, whereby further rotation in the mirror-down direction is restricted, and the mirror holder 502 is positioned at the mirror-down position. The positioning shaft 403 corresponds to an example of the positioning member of the present invention. Further, a mirror-up stopper 401 with which the tip of the mirror holder 502 rotated to the mirror-up position contacts is attached to the mirror box 400. The mirror-up stopper 401 is formed of an elastic member and absorbs an impact when the tip of the mirror holder 502 abuts.

  A drive device 600 is arranged on one side of the mirror box 400. The drive device 600 includes an up cam gear 601, a down cam gear unit 650, a reduction gear 602, a pinion 603, a motor 604, and a motor base 605. The up cam gear 601 corresponds to an example of the first cam member of the present invention, and the down cam gear unit 650 corresponds to an example of the second cam member of the present invention.

  The down cam gear unit 650, the up cam gear 601, and the reduction gear 602 are each rotatably supported on a rotation shaft 400a protruding from the mirror box 400, and the pinion 603 is fixed to the output shaft of a motor 604. The motor 604 is supported by a motor base 605, and the motor base 605 is attached to one side portion of the mirror box 400 with screws or the like.

  The down cam gear unit 650 meshes with the up cam gear 601, the up cam gear 601 meshes with the reduction gear 602, and the reduction gear 602 meshes with the pinion 603. The down cam gear unit 650 and the up cam gear 601 have the same number of gear teeth. When a voltage is applied to the motor 604, the driving force of the motor 604 is transmitted to the down cam gear unit 650 via the pinion 603, the reduction gear 602 and the up cam gear 601, and the down cam gear unit 650 and the up cam gear 601 have the same rotation speed. Rotate.

  The down cam gear unit 650 includes a down cam gear 651, a movable cam 652 that abuts the drive shaft 502c to urge the mirror holder 502 to the mirror down position, and an urging spring 653 that imparts an urging force to the movable cam 652. . Here, the movable cam 652 and the biasing spring 653 correspond to an example of the biasing member of the present invention.

  FIG. 3 is a diagram illustrating the down cam gear unit 650. 3A is a view of the down cam gear unit 650 as seen from the direction of arrow A in FIG. 2, FIG. 3B is a view as seen from the direction of arrow B of FIG. 2, and FIG. 3C is FIG. 3B. FIG. 7 is a sectional view taken along line EE of FIG.

  As shown in FIG. 3, in the present embodiment, the movable cam 652 is configured by an arc-shaped lever member, and is rotatable with respect to a rotation shaft 651a that protrudes in parallel with the rotation center of the down cam gear 651 from the down cam gear 651. It is supported. The urging spring 653 is arranged between the down cam gear 651 and the movable cam 652, and urges the movable cam 652 against the down cam gear 651 in the direction of arrow D in FIG. As shown in FIG. 3C, the movable cam 652 has a stopper pin 652a, and the stopper pin 652a comes into contact with a stopper 651b provided on the down cam gear 651 and stops.

  The movable cam 652 has an arcuate cam surface 652b that abuts the drive shaft 502c of the mirror holder 502. The movable cam 652 exerts an urging force for urging the mirror holder 502 toward the mirror-down position with respect to the drive shaft 502c by the spring pressure of the urging spring 653. The cam surface 652b exerts a first urging area 652c that exerts an urging force on the drive shaft 502c and abuts the drive shaft 502c at the mirror-down position, and an urging force larger than the first urging area 652c on the drive shaft 502c. And a second urging area 652d that acts and abuts. The second urging area 652d is arranged on the base end side near the rotation center of the movable cam 652, and the first urging area 652c is arranged on the tip end side far from the rotation center of the movable cam 652.

  Here, the torque generated by the biasing spring 653 is T, and the distance between the normal line P1 of the first biasing region 652c and the line C1 parallel to the normal line P1 and passing through the rotation shaft 651a is S1. Further, the distance between the normal line P2 of the second biasing area 652d and the line C2 that is parallel to the normal line P2 and passes through the rotation axis 651a is S2. In this case, the urging force on the drive shaft 502c in the first urging area 652c is represented by T / S1, and the urging force on the drive shaft 502c in the second urging area is represented by T / S2. As shown in FIG. 3, by setting S1> S2, the biasing force in the first biasing region (T / S1) <the biasing force in the second biasing region (T / S2) Become.

  Next, the operation of the mirror driving unit 1000 will be described with reference to FIGS. 4 and 5. FIG. 4 is a time chart showing changes in the voltage applied to the motor 604, the position of the mirror holder 502, and the biasing force acting on the drive shaft 502c of the mirror holder 502 from the movable cam 652. FIG. 5 is a view for explaining the operations of the mirror unit 500, the down cam gear unit 650, and the up cam gear 601 as seen from the direction of arrow C in FIG. Note that the switching control of the applied voltage of the motor 604 and the control of the short brake described below are based on a sequence program (see FIG. 4) recorded in a storage unit such as a ROM, and a control board (not shown) of the camera body 1 It is executed by a CPU or the like mounted in the above.

  In FIG. 4, an area a is an area where the mirror holder 502 is stopped at the mirror down position, and corresponds to the state of FIG. In the state of FIG. 5A, the movable cam 652 of the down cam gear unit 650 abuts the drive shaft 502c of the mirror holder 502 in the first urging area 652c, and the mirror holder 502 is rotated counterclockwise about the rotation shaft 502a. It is biased in the direction of rotation. At this time, the tip end of the mirror holder 502 contacts the positioning shaft 403 and is held at the mirror down position.

  By applying an effective voltage of 6.0 V to the motor 604 in this state, the down cam gear unit 650 rotates in the clockwise direction and the up cam gear 601 rotates in the counterclockwise direction. When the down cam gear unit 650 rotates in the clockwise direction, the portion of the cam surface 652b that comes into contact with the drive shaft 502c slides toward the tip side, and then the drive shaft 502c disengages from the cam surface 652b (timing b in FIG. 4).

  At this time, as shown in FIG. 5B, the up cam gear 601 comes into contact with the drive shaft 502c (timing b in FIG. 4). In this way, by bringing the up cam gear 601 into contact with the drive shaft 502c that is away from the cam surface 652b, the biasing force from the movable cam 652 does not become a driving load of the mirror holder 502, and power saving can be achieved. Further, since the motor 604 to the drive shaft 502c are all made of a rigid body, the drive force of the motor 604 can be directly transmitted to the mirror holder 502, and the speed control of the mirror holder 502 becomes easy.

  After the up cam gear 601 contacts the drive shaft 502c, the effective voltage applied to the motor 604 is lowered to 3.0V when the mirror holder 502 moves in the mirror up direction to the position shown in FIG. 5C (see FIG. 4). Timing c). As a result, the rotation speed of the motor 604 decreases, and the rotation speeds of the up cam gear 601 and the down cam gear unit 650 decrease.

  At this time, since the mirror holder 502 has inertia, it tries to continue moving at a constant speed toward the mirror-up position, but when the drive shaft 502c contacts the down cam gear 651 that is decelerating, the mirror holder 502 rebounds and decelerates. . The decelerated mirror holder 502 is driven at a speed according to the rotational speed of the up cam gear 601 and the down cam gear 651 while bouncing back between the up cam gear 601 and the down cam gear 651. The F line in FIG. 4 represents the position of the surface of the up cam gear 601, and the G line represents the position of the surface of the up cam gear 601. Further, since the motor 604 to the drive shaft 502c are all made of a rigid body, the deceleration force of the motor 604 can be directly transmitted to the mirror holder 502, and the speed control of the mirror holder 502 is easy.

  When the mirror holder 502 further moves in the mirror-up direction, the mirror holder 502 contacts the mirror-up stopper 401. At this time, the mirror holder 502 comes into contact with the mirror-up stopper 401 in a decelerated state, so that the impact at the time of contact can be alleviated. Although the effective value of the applied voltage of the motor 604 is a combination of 6.0 V and 3.0 V here, the mode of the combination is arbitrary, and as a method of controlling the effective value of the applied voltage of the motor 604. Is preferably PWM control.

  After the mirror holder 502 contacts the mirror-up stopper 401, a short brake acts on the motor 604, and the mirror unit 500 stops driving at the mirror-up position (region d in FIG. 4, FIG. 5D). . At this time, the mirror holder 502 receives an urging force in the counterclockwise direction from the mirror-up stopper 401, and the drive shaft 502c is pressed against the up-cam gear 601 to be held at the mirror-up position. At the mirror-up position, the subject light flux that has passed through the interchangeable lens 200 is guided to the image sensor 33 and is photographed.

  After the image capturing, the effective voltage of 6.0 V is applied to the motor 604, so that the down cam gear unit 650 rotates clockwise and the up cam gear 601 rotates counterclockwise. When the up cam gear 601 rotates counterclockwise, the drive shaft 502c separates from the up cam gear 601 and contacts the down cam gear unit 650 (timing e in FIG. 4, FIG. 5 (e)). When the down cam gear unit 650 comes into contact with the drive shaft 502c, the mirror holder 502 starts moving counterclockwise toward the mirror down position. At this time, since the motor 604 to the drive shaft 502c are all made of a rigid body, the drive force of the motor 604 can be directly transmitted to the mirror holder 502, and the speed control of the mirror holder 502 is easy.

  After the down cam gear unit 650 contacts the drive shaft 502c, the effective voltage applied to the motor 604 is lowered to 3.0V when the mirror holder 502 moves to the position of FIG. 5 (f) (timing f of FIG. 4). . As a result, the rotation speed of the motor 604 decreases, and the rotation speeds of the up cam gear 601 and the down cam gear unit 650 decrease.

  At this time, since the mirror unit 500 has inertia, it tries to continue moving at a constant speed toward the mirror-down position, but the drive shaft 502c abuts on the decelerating up-cam gear 601 to rebound and decelerate. . The decelerated mirror holder 502 bounces between the up cam gear 601 and the down cam gear unit 650, and is driven at a speed corresponding to the rotation speed of the up cam gear 601 and the down cam gear unit 650. The line H in FIG. 4 represents the position of the surface of the up cam gear 601, and the line J represents the position of the surface of the down cam gear unit 650.

  Further, since the motor 604 to the drive shaft 502c are all made of a rigid body, the deceleration force of the motor 604 can be directly transmitted to the mirror holder 502, and the speed control of the mirror holder 502 is easy. Although the effective value of the voltage applied to the motor 604 is a combination of 6.0 V and 3.0 V here, the combination mode is arbitrary.

  When the mirror holder 502 further moves in the mirror down direction, the drive shaft 502c comes into contact with the second biasing region 652d of the cam surface 652b of the movable cam 652 (timing g in FIG. 4, FIG. 5 (g)). When the driving is further continued, the mirror holder 502 comes into contact with the positioning shaft 403 and bounces in the clockwise direction. When the drive shaft 502c is biased in the counterclockwise direction by the second biasing region 652d, the mirror holder 502 that has rebounded moves in the clockwise direction again and comes into contact with the positioning shaft 403 and rebounds. Therefore, the mirror holder 502 repeatedly bounces and bounces until it completely stops at the mirror down position.

  Since the camera cannot perform AE (automatic exposure) control while the mirror holder 502 is bound, it is desirable to shorten the time until the bound is converged in order to shorten the time for one sequence. Since the larger the biasing force that biases the drive shaft 502c in the mirror down direction, the more the mirror holder 502 bounces. Therefore, the drive shaft 502c abuts the second biasing region 652d while bounding. It is desirable to be present (region h in FIG. 4 and FIG. 5 (h)). The time during which the biasing force from the second biasing area 652d is acting on the mirror holder 502 can be controlled by the deceleration amount when moving to the mirror down position. That is, in the present embodiment, it is possible to shorten the time for one sequence.

  After that, when the drive shaft 502c comes into contact with the first biasing region 652c of the cam surface 652b, the short brake acts on the motor 604 to stop the driving (region a in FIG. 4 and FIG. 5A). By applying the short brake after the drive shaft 502c contacts the first biasing region 652c, the drive shaft 502c always receives the biasing force from the first biasing region 652c in the mirror down state. .

  Here, the mirror holder 502 is always in the mirror down position when the power of the camera is turned off, and the mirror down position is the position that is held for the longest time. In the mirror-down position, the mirror holder 502 is rotatably held by the rotary shaft 502a, and the drive shaft 502c existing near the rotary shaft 502a is attached in the mirror-down direction with the tip end abutting the positioning shaft 403. Energized.

  In this case, when a strong biasing force is applied to the mirror holder 502, the entire mirror holder 502 is distorted, and the angle and flatness of the mirror 501 are changed, which may change the finder image distortion and the finder focus distance. There is. In the present embodiment, as described above, at the mirror down position, the drive shaft 502c is biased in the mirror down direction by the first biasing region 652c having a weak biasing force. Therefore, it is possible to suppress the distortion of the mirror holder 502 and prevent the angle and flatness of the mirror 501 from changing.

  Further, as shown in FIG. 5, the cam surface 652 is provided so as not to come into contact with the drive shaft 502c at the same time as the up cam gear 601. When the drive shaft 502c simultaneously contacts the up cam gear 601 and the cam surface 652 during driving, sliding resistance increases and power consumption during driving increases. It is possible to save power by preventing simultaneous contact as in the present embodiment.

  As described above, in the present embodiment, the time until the bounce convergence of the mirror holder 502 at the mirror down position is shortened and the driving of the mirror holder 502 is stopped without affecting the finder image and the focus distance of the finder. The time can be shortened. As a result, it is possible to speed up continuous shooting by the camera.

(Second embodiment)
Next, with reference to FIG. 6 and FIG. 7, a camera as a second embodiment of the image pickup apparatus of the present invention will be described. In this embodiment, the same parts as those in the first embodiment will be designated by the same reference numerals and only different parts will be described.

  FIG. 6 is a time chart showing changes in the voltage applied to the motor 604, the position of the mirror holder 502, and the biasing force acting on the drive shaft 502c of the mirror holder 502 from the movable cam 652. FIG. 7 is a view for explaining the operations of the mirror unit 500, the down cam gear unit 650, and the up cam gear 601 as seen from the direction of arrow C in FIG. The switching control of the applied voltage of the motor 604 and the control of the short brake described below are based on a sequence program (see FIG. 6) recorded in a storage unit such as a ROM and the like, which is not shown in the control board of the camera body 1. It is executed by a CPU or the like mounted in the above.

  In FIG. 6, a region a is a region where the mirror holder 502 is stopped at the mirror down position, and corresponds to the state of FIG. Since the operation from the area a (FIG. 7A) in FIG. 6 to the timing f (FIG. 7F) in FIG. 6 is the same as that in the first embodiment, illustration and description thereof will be omitted.

  After the timing f in FIG. 6 (FIG. 7 (f)), the mirror holder 502 moves in the mirror down direction while the drive shaft 502c bounces between the up cam gear 601 and the down cam gear 651. Then, the drive shaft 502c comes into contact with the second biasing region 652d of the cam surface 652b of the movable cam 652 (timing k in FIG. 6, FIG. 7 (k)).

  At this time, the second urging area 652d is provided so as to come into contact with the drive shaft 502c at the same time as the up cam gear 601, and the drive shaft 502c moves to the up cam gear 601 by the second urging area. It is urged against. The urging force suppresses bounding of the drive shaft 502c, and the mirror holder 502 is driven down so that the drive shaft 502c follows the cam surface of the up cam gear 601. At this time, H in FIG. 6 indicates the position of the surface of the up cam gear 601, and line K indicates the position of the surface of the movable cam 652.

  When the driving is further continued, the mirror holder 502 comes into contact with the positioning shaft 403 (timing m in FIG. 6, FIG. 7 (m)) and bounces in the clockwise direction. At this time, the mirror holder 502 is driven down so that the drive shaft 502c follows the cam surface of the up cam gear 601, so that the momentum of the collision with the positioning shaft 403 is small and the size of the bounce is small. It takes less time.

  After that, when the drive shaft 502c comes into contact with the first biasing area 652c of the cam surface 652b, the short brake acts on the motor 604 to stop the driving (area a in FIG. 6, FIG. 7A).

  As described above, in the present embodiment, the bounce convergence effect obtained between the second urging region 652d and the positioning shaft 403 in the first embodiment is applied to the second urging region 652d and the up cam gear. 601 and gained. By doing so, it is possible to obtain the bounce convergence effect from an early stage, and it is possible to use the side of the second biasing area having the stronger biasing force. It can be suppressed. That is, the present embodiment is inferior to the first embodiment in terms of power saving, but has an effect that the time for one sequence can be shortened.

  As described above, in the present embodiment, the time until the bounce convergence of the mirror holder 502 at the mirror down position is shortened and the driving of the mirror holder 502 is stopped without affecting the finder image and the focus distance of the finder. The time can be shortened. As a result, it is possible to speed up continuous shooting by the camera.

  The configuration of the present invention is not limited to those illustrated in the above embodiments, and the material, shape, size, form, number, arrangement location, etc. are appropriately changed without departing from the gist of the present invention. It is possible.

400 Mirror box 403 Positioning shaft 500 Mirror unit 501 Mirror 502 Mirror holder 502c Drive shaft 601 Up cam gear 604 Motor 650 Down cam gear unit 651 Down cam gear 652 Movable cam 652b Cam surface 652c First urging area 652d Second urging area

Claims (7)

It moves between a mirror-down position that enters the shooting optical path and a mirror-up position that retracts from the shooting optical path, reflects the subject light flux at the mirror-down position and guides it to the finder optical system, and the subject light flux at the mirror-up position. A mirror unit for guiding the
A first cam member for driving the mirror unit from the mirror down position to the mirror up position;
A second cam member for driving the mirror unit from the mirror up position to the mirror down position;
A positioning member that positions the mirror unit at the mirror down position by contacting the mirror unit at the mirror down position and restricting movement of the mirror unit in the mirror down direction;
An urging member which is provided on the second cam member and urges the mirror unit abutting the positioning member toward the positioning member;
The biasing member includes a first biasing region that biases the mirror unit toward the positioning member, and a biasing force that is greater than the first biasing region that directs the mirror unit toward the positioning member. A second biasing region for biasing is provided,
The mirror unit is biased toward the positioning member by the second biasing area until the driving of the mirror unit toward the mirror down position by the second cam member is stopped, An image pickup apparatus, wherein the first biasing region biases the positioning member toward the positioning member when the driving is stopped.   The urging force of the urging member does not act on the mirror unit when the mirror unit is driven in the direction of the mirror up position by the first cam member. The imaging device according to.   The urging member has a lever member rotatably supported with respect to the second cam member, and the second urging region is arranged on a base end side near a rotation center of the lever member, The image pickup apparatus according to claim 1, wherein the first urging region is arranged on a front end side of the lever member. A motor for transmitting a driving force to the first cam member,
The first cam member meshes with the second cam member, and the driving force of the motor is transmitted to the second cam member via the first cam member. The image pickup apparatus according to claim 1, wherein A control means for controlling the drive of the motor,
The imaging device according to claim 4, wherein the control unit controls the speed of the motor so that the drive of the second cam member is decelerated before the mirror unit contacts the positioning member. apparatus. The mirror unit includes a driven portion that receives a driving force from the first cam member and the second cam member,
The imaging device according to claim 1, wherein the urging member is provided so that the driven portion can be in contact with the urging member while the driven portion is in contact with the first cam member. apparatus.   7. The image pickup apparatus according to claim 6, wherein the driven portion is in contact with the urging member while being in contact with the first cam member before the mirror unit is in contact with the positioning member.