JP6818564B2 - Imaging device - Google Patents

Description

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

The single-lens reflex camera is rotatably supported between a mirror down position in which a mirror unit having a main mirror and a sub mirror enters the photographing optical path with respect to the mirror box and a mirror up position in which the mirror unit retracts from the photographing optical path. As such a single-lens reflex camera, a configuration in which a sub-mirror is driven by using a toggle spring with respect to the main mirror between the mirror down position and the mirror up position is generally known, but the urging direction of the toggle spring is determined. A large drive torque is required when reversing.

Therefore, an urging member is rotatably provided in the angle adjustment mechanism of the mirror holder, and the mirror holder is urged toward the mirror down position in the mirror down position, and the mirror holder is attached toward the mirror up position in the mirror up state. A vigorous camera has been proposed (Patent Document 1). In this proposal, the urging member is brought into contact with the hole provided in the mirror box while the mirror unit is rotating.

Japanese Patent No. 5456081

In Patent Document 1, the rotation shaft of the urging member is fixed to the angle adjusting mechanism in order to prevent the movable range of the urging member from being varied depending on the angle adjustment result of the mirror holder. Therefore, it is necessary to make the rotation shaft of the urging member metal as a part to be fixed to the metal angle adjustment mechanism, and it is necessary to perform caulking to fix the metal rotation shaft. , There is a problem that the number of parts and processing man-hours increase.

Therefore, the present invention does not require a large drive torque due to the reversal load of the toggle spring, urges the mirror in the down direction in the mirror down state, urges the mirror in the up direction in the mirror up state, and has the number of parts and processing. An object of the present invention is to provide an imaging device capable of reducing man-hours.

In order to achieve the above object, the imaging apparatus of the present invention has a first cam region and a second cam region, and has a mirror holder that rotates between a mirror up position and a mirror down position, and an opening. Rotates coaxially with the mirror urging member at a position where the mirror urging member is sandwiched between the mirror box, the mirror urging member rotatably supported by the mirror box, and the mirror box. The angle adjusting member, which is movably arranged and is fixed to the mirror box after the angle adjustment, enables the angle adjustment of the mirror holder at the mirror down position by the rotational operation with respect to the mirror box, and the said. The mirror urging member includes an urging spring for urging the mirror urging member, and the mirror urging member includes a contact portion capable of contacting the opening end of the opening, the first cam region, and the second cam region. A follower capable of following the cam region is provided, and at the mirror down position, the follower abuts on the first cam region due to the urging force of the urging spring to hold the mirror holder. It is urged toward the mirror down position, and at the mirror up position, the follower abuts on the second cam region by the urging force of the urging spring, and the mirror holder is urged toward the mirror up position. It is characterized by doing.

According to the present invention, a large drive torque due to the reversal load of the toggle spring is not required, the mirror is urged in the down direction in the mirror down state, the mirror is urged in the up direction in the mirror up state, and the number of parts and processing are performed. Man-hours can be reduced.

(A) is a schematic cross-sectional view showing a mirror down state of the mirror unit of the digital single-lens reflex camera according to the first embodiment of the imaging device of the present invention, and (b) is a mirror unit of the digital single-lens reflex camera shown in (a). It is a schematic cross-sectional view which shows the mirror-up state of. It is an exploded perspective view of a mirror box and a mirror unit. It is a figure which shows the mirror box which the mirror unit is a mirror down state. 3A is a cross-sectional view taken along the line AA of FIG. 3C. It is an exploded perspective view of a mirror box, a mirror urging member, an angle adjusting plate, and an urging spring. It is a figure which shows the mirror urging member. It is a figure explaining the operation of the mirror unit, the mirror stopper, and the contact portion in the mirror down state of the mirror unit. It is a figure explaining the operation of the mirror unit, the mirror stopper, and the contact portion during the rotation operation of the mirror unit. It is a figure explaining the operation of a mirror unit and a mirror stopper in a mirror lockup state of a mirror unit. It is sectional drawing of the main part of the mirror unit in the digital single-lens reflex camera which is the 2nd Embodiment of the image pickup apparatus of this invention. It is an exploded perspective view explaining the conventional mirror urging member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1A is a schematic cross-sectional view showing a mirror down state of a mirror unit of a digital single-lens reflex camera according to the first embodiment of the imaging device of the present invention, and FIG. 1B is a digital diagram shown in FIG. 1A. It is the schematic sectional drawing which shows the mirror-up state of the mirror unit of a single-lens reflex camera.

As shown in FIG. 1, in the digital single-lens reflex camera (hereinafter referred to as a camera) of the present embodiment, an interchangeable lens 2 is detachably attached to the front side (subject side) of the camera body 1. The camera body 1 is provided with an image sensor 3, an optical viewfinder unit 4, a mirror unit 5 mainly composed of a main mirror holder 502 and a sub mirror holder 504, and an autofocus unit 6.

In the shooting standby state shown in FIG. 1A, the main mirror holder 502 and the sub mirror holder 504 are located in the mirror down state that has entered the shooting optical path. At this time, the incident luminous flux that has passed through the interchangeable lens 2 is divided by the main mirror 501, which is a half mirror held by the main mirror holder 502. Then, the luminous flux reflected by the main mirror 501 is guided to the optical finder unit 4 and displayed as an optical image that can be observed by the photographer. On the other hand, the light flux transmitted through the main mirror 501 is reflected by the sub mirror 503 held by the sub mirror holder 504 and incident on the autofocus unit 6. Therefore, the luminous flux that has passed through the interchangeable lens 2 does not reach the image sensor 3.

When the photographer performs the imaging start operation, as shown in FIG. 1 (b), the camera body 1 is in a mirror-up state in which the main mirror holder 502 is retracted from the imaging optical path and is in the imaging state. At this time, the sub mirror holder 504 is also retracted above the luminous flux while overlapping the main mirror holder 502. Therefore, during imaging, the luminous flux that has passed through the interchangeable lens 2 reaches the imaging sensor 3 without being guided to the finder unit 4 and the autofocus unit 6. As described above, in the imaging operation, the mirror unit 5 is rotatably placed in the mirror box 500 (see FIG. 2) between the mirror down state shown in FIG. 1A and the mirror lockup state shown in FIG. 1B. It is supported.

Next, the mirror unit 5 will be described in detail with reference to FIGS. 2 to 4. FIG. 2 is an exploded perspective view of the mirror box 500 and the mirror unit 5. Hereinafter, for convenience of explanation, the incident optical axis direction will be described as the z direction, the height direction of the camera as the y direction, and the right direction in the width direction when viewed from the front side of the camera as the x direction. FIG. 3A is a view of the mirror box 500 viewed from the front side of the camera in the width direction, FIG. 3B is a view of the mirror box 500 viewed from the front side of the camera, and FIG. 3C is a view. It is a figure which looked at the mirror box 500 from the right side in the width direction when viewed from the front side of a camera.

As shown in FIG. 2, the main mirror holder 502 holds the main mirror 501. The main mirror holder 502 is provided with a rotation shaft 502a of the main mirror holder 502, a rotation shaft 502b of the sub mirror holder 504, and a drive pin 502c to which a driving force is transmitted to the main mirror holder 502.

The sub mirror holder 504 holds the sub mirror 503. The sub mirror holder 504 is provided with a bearing portion 504a and a reversing cam 504b. The sub mirror holder 504 is rotatably supported by the main mirror holder 502 by fitting the bearing portion 504a into the rotation shaft 502b of the main mirror holder 502.

As shown in FIGS. 3A and 3C, the mirror box 500 is provided with a bearing portion 500e, and the bearing portion 500e supports the rotation shaft 502a of the main mirror holder 502. .. As a result, the main mirror holder 502 is rotatably supported between the mirror lockup position and the mirror down position together with the sub mirror holder 504 with respect to the mirror box 500.

As shown in FIG. 3A, the drive pin 502c provided in the main mirror holder 502 is arranged so as to project outward from the opening 500f formed in the left side wall in the width direction of the mirror box 500. A drive member from a mirror drive system (not shown) is engaged with the drive pin 502c, and a drive force is transmitted from the drive member to the drive pin 502c, so that the main mirror holder 502 is a sub-mirror centered on the rotation shaft 502a. It rotates in the mirror lockup direction together with the holder 504.

As shown in FIG. 3B, the mirror box 500 is provided with a mirror stopper 402. The main mirror holder 502 and the sub mirror holder 504 that are rotated in the mirror lockup direction come into a mirror lockup position after the main mirror holder 502 comes into contact with the contact portion 401 attached to the mirror stopper 402.

The main mirror holder 502 in the mirror lockup position rotates in the mirror down direction together with the sub mirror holder 504 by transmitting the driving force of the drive pin 502c from the mirror drive system in the mirror down direction. The main mirror holder 502 and the sub mirror holder 504 that are rotated in the mirror down direction come into a mirror down position after the main mirror holder 502 comes into contact with the stopper 500 g provided on the mirror box 500.

An angle adjusting plate 506 as an adjusting member for adjusting the angle of the sub mirror holder 504 is attached to the mirror box 500. In the mirror down state, the sub mirror holder 504 is in contact with the angle adjustment pin 506b provided on the angle adjustment plate 506.

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 (c). FIG. 5 is an exploded perspective view of the mirror box 500, the mirror urging member 505, the angle adjusting plate 506, and the urging spring 507. The angle adjusting plate 506 corresponds to an example of the angle adjusting member of the present invention.

Since the sub-mirror holder 504 reflects the light flux that has passed through the interchangeable lens 2 in the mirror-down state by the sub-mirror 503 and is accurately incident on the autofocus unit 6, it is necessary to appropriately adjust the rotation angle at the time of assembly. Therefore, the mirror box 500 is provided with an angle adjusting plate 506 that adjusts the angle of the sub mirror holder 504 in the mirror down state.

As shown in FIGS. 4 and 5, the angle adjusting plate 506 is provided with a rotating shaft hole 506a, an angle adjusting pin 506b, a rotation limiting portion 506c, and a sliding surface 506d. The rotating shaft hole 506a is fitted into a rotating shaft 500a-2 provided in the mirror box 500, whereby the angle adjusting plate 506 can rotate about the rotating shaft hole 506a with respect to the mirror box 500. Is supported by.

The angle adjusting pin 506b is provided so as to project from the angle adjusting plate 506 toward the mirror box 500, and reaches the inside of the mirror box 500 through an opening 500e provided in the mirror box 500. The angle adjusting pin 506b comes into contact with the sub mirror holder 504 inside the mirror box 500, and the position in the mirror lockup direction is restricted. At the time of assembly, the angle adjustment pin 506b rotates with respect to the mirror box 500 to adjust the angle at the mirror down position of the sub mirror holder 504, and after adjusting the angle, is fixed to the mirror box 500 with a screw (not shown). To.

At this time, it is easier to adjust the angle of the sub mirror holder 504 if the relationship between the rotation angle at which the angle adjusting plate 506 is moved and the rotation angle of the sub mirror holder 504 changes linearly. Therefore, it is desirable that the rotation shaft 500a-2, which is the rotation center of the angle adjusting plate 506, is substantially at the same position on the zy plane as the rotation shaft hole 504a of the sub-mirror holder 504 in the mirror down state.

The sub mirror holder 504 is required to keep the luminous flux guided to the autofocus unit 6 constant even if the mirror down operation is repeatedly performed. Therefore, it is desirable that the angle adjusting plate 506 and the angle adjusting pin 506b are made of a metal member in order to suppress deformation and breakage when the sub mirror holder 504 that comes into contact with the mirror down operation is repeatedly impacted.

In the present embodiment, the angle adjusting plate 506 is made of stainless steel, and the angle adjusting pin 506b is made of iron, and is joined to the angle adjusting plate 506 by caulking so as not to cause rattling or shaft tilt. There is.

The sub-mirror holder 504 needs to suppress the vibration generated when it comes into contact with the angle adjusting pin 506b during the mirror down operation so that the incident light flux can be stably guided to the autofocus unit 6. Therefore, the sub mirror holder 504 is urged in the mirror down direction by the mirror urging member 505 so as to be urged with respect to the angle adjusting pin 506b at the mirror down position.

On the other hand, in the mirror lockup state, the sub mirror holder 504 may be urged in the direction of contacting the main mirror holder 502 so that the incident light flux to the image sensor 3 is not unnecessarily blocked by the sub mirror holder 504. desirable. Therefore, in the mirror lockup state, the mirror urging member 505 urges the sub mirror holder 504 in the mirror lockup direction.

The mirror urging member 505 is inserted into the mirror box 500 through the opening 500b formed in the mirror box 500, can come into contact with the opening end of the opening 500b, and further follows the cam region of the reversing cam 504b. It is equipped with a possible urging pin 505a. Further, the mirror urging member 505 also includes a spring receiving portion 505b, a rotating shaft hole 505c, a sliding surface 505d, a receiving surface 505e as a shaft tilt suppressing member, and an angle regulating pin 505f. The urging pin 505a corresponds to an example of the follower of the present invention.

The mirror urging member 505 is rotatably supported with respect to the mirror box 500 about the rotation shaft hole 505c by inserting the rotation shaft hole 505c into the rotation shaft 500a-1. After that, the rotation shaft hole 506a of the angle adjusting plate 506 is similarly inserted into the rotation shaft 500a-2. The angle regulating pin 505f, which is one of the members that regulate the rotatable range of the sub mirror holder 504, is inserted into the opening of the rotation limiting portion 506c provided on the angle adjusting plate 506.

The inverting cam 504b directs the sub-mirror holder 504 in the mirror-down state toward the mirror-down position when the cam region 504b-1 (see FIG. 7E), which is the first cam region, comes into contact with the urging pin 505a. To urge. Further, the cam region 504b-2, which is the second cam region of the reversing cam 504b, comes into contact with the urging pin 505a to urge the sub mirror holder in the mirror lockup state toward the mirror lockup position. The details of the cam operation of the inverting cam 504b will be described later.

As shown in FIG. 5, when the mirror urging member 505 and the urging spring 507 are attached to the mirror box 500, in the mirror urging member 505, the free end of the urging spring 507 is hooked on the spring receiving portion 505b. Will be done. Then, depending on the stage of mirror operation, the mirror urging member 505 may be placed in any of the opening 500b of the mirror box 500, the reversing cam 504b of the sub mirror holder 504, and the rotation limiting portion 506c of the angle adjusting plate 506 from the positive direction of the X axis. See and convey the force in the counterclockwise direction.

As shown in FIG. 4, the rotating shafts 500a-1 and 500a-2 provided on the mirror box 500 are stepped shafts so that the mirror urging member 505 and the angle adjusting plate 506 can rotate coaxially. It is configured and arranged coaxially. The coaxial arrangement of the rotating shafts 500a-1 and 500a-2 will be described with reference to the detailed view of the conventional mirror urging member shown in FIG. In FIG. 11, for convenience of explanation, the parts corresponding to the present embodiment are designated by the same reference numerals.

In the conventional angle adjusting plate 506 and the mirror urging member 505, the rotation shaft hole 506a of the angle adjusting plate 506 and the rotation center 505c of the urging pin 505a are provided at different positions instead of coaxially, and the mirror is urged. The member 505 is rotatably caulked and fixed around the fixed shaft 505h.

This is because when the rotation axis of the rotation center 505c is provided in the mirror box 500, when the angle adjustment plate 506 is rotated to adjust the rotation angle of the sub mirror holder 504, the rotation limiting portion 506c of the angle adjustment plate 506 The positional relationship (clearance) with the angle control pin 505f changes. Therefore, the movable range of the mirror urging member 505 varies depending on the angle adjustment result of the sub mirror holder 504.

When the mirror unit 5 rotates to bring the mirror down, the sub mirror holder 504 collides with the angle adjusting pin 506b and bounces. At this time, in the sub mirror holder 504, the reversing cam 504b pushes the urging pin 505a and charges the spring force of the urging spring 507 to decelerate the bounce. Further, the bounce is restricted by the angle restricting pin 505f colliding with the rotation limiting portion 506c.

If the rotation range of the mirror urging member 505 varies, the bounce time of the sub mirror holder 504 also varies, and there is a concern that the autofocus performance may deteriorate. Therefore, it is desirable that the rotation range of the mirror urging member 505 does not vary depending on the angle adjustment result of the sub mirror holder 504.

However, since it is necessary to manufacture the fixed shaft 505h with a cut metal shaft as a part for fixing to the metal angle adjusting plate 506, and it is necessary to perform caulking to fix it to the angle adjusting plate 506. The number of parts and processing man-hours will increase.

Therefore, in the present embodiment, the rotation shaft hole 505c of the mirror urging member 505 and the rotation shaft hole 506a of the angle adjusting plate 506 are arranged coaxially. As a result, it is not necessary to separately provide a rotation shaft dedicated to the mirror urging member on the angle adjusting plate 506, and it is possible to reduce the number of parts and the man-hours for the caulking process.

Further, in the present embodiment, as shown in FIG. 4, the amount of backlash in the axial direction (x direction) of the mirror urging member 505 is adjusted to the sliding surface 505d of the urging member 505, the sliding surface 500c, and the sliding surface. It is configured to be determined between 506d and 506d. As a result, the mirror urging member 505 and the angle adjusting plate 506 can be simply assembled to the mirror box 500 in this order, and the assembly becomes easy. Further, since it is not necessary to perform caulking for attaching the mirror urging member 505, the mirror urging member 505 can be manufactured from a molded plastic part.

When the mirror urging member 505 and the angle adjusting plate 506 are attached to the mirror box 500, the mirror urging member 505 is located between the mirror box 500 and the angle adjusting plate 506 on the rotation axis. At this time, the position of the angle adjusting plate 506 in the axial direction (x direction) is restricted by the sliding surface 506d coming into contact with the pedestal 500d. Therefore, the axial position of the mirror urging member 505 is regulated between the sliding surface 500c of the mirror box 500 and the sliding surface 506d of the angle adjusting plate 506.

The amount of backlash in the axial direction of the mirror urging member 505 is the amount of backlash and rotation in the axial direction caused by the difference between the distance between the sliding surfaces 500c and 506d and the distance between the sliding surfaces 505d facing each surface. It is a combination of the amount of shaft tilting backlash due to the fitting backlash of the shaft 500a-1 and the rotating shaft hole 505c. Of these, in order to suppress backlash in the shaft tilt direction, the tip of the rotation shaft hole 505c of the mirror urging member 505 on the radial urging pin 505a side has a receiving surface as the first shaft tilt suppressing member. 505e1 is provided. The receiving surface 505e2 and the receiving surface 505e3 as the second shaft tilt suppressing member and the third shaft tilt suppressing member will be described later.

Next, the receiving surfaces 505e1 to 501e3 will be described in detail with reference to FIGS. 5 and 6. FIG. 6 is a diagram showing a mirror urging member 505. As shown in FIG. 5, the urging force of the urging spring 507 is transmitted to the urging pin 505a via the spring receiving portion 505b of the mirror urging member 505, and the mirror urging member 505 passes through the rotating shaft hole 505c. It rotates to the center and suppresses the bounce of the sub mirror holder 504.

At this time, if the mirror urging member 505 is tilted in the direction in which the urging pin 505a is separated from the inside of the mirror box 500 due to the backlash of each part, the urging force of the urging spring 507 does not sufficiently act on the sub mirror holder 504. In some cases. Therefore, first, the receiving surface 505e1, which is the first fall suppressing member, is on a straight line connecting the rotating shaft hole 505c and the urging pin 505a, and is from the urging pin 505a in the radial direction of the rotating shaft hole 505c. Placed at a distance.

In the present embodiment, in order to suppress the occurrence of shaft tilt of the mirror urging member 505 in all directions, one receiving surface is arranged in each of a plurality of divided regions around the rotating shaft hole 505c. Specifically, the receiving surface 505e1 which is the first fall suppressing member, the receiving surface 505e2 which is the second fall suppressing member, and the receiving surface 505e3 which is the third fall suppressing member are divided into three around the rotation shaft hole 505c. One is placed in each of the areas. Further, the angle A1 formed by the receiving surface 505e1 and the receiving surface 505e2 around the rotating shaft hole 505c, the angle A2 formed by the receiving surface 505e2 and the receiving surface e3, and the angle A3 formed by the receiving surface 505e3 and the receiving surface 505e1 are substantially equivalent. Become.

Further, the angle regulating pin 505f may be in any phase around the rotating shaft hole 505c for the purpose of regulating the rotatable range of the sub mirror holder 504, but the rotating shaft hole 505c and the receiving surface 505e2 or It is desirable to arrange it on a straight line connecting the receiving surface 505e3. By arranging in this way, the volume of the mirror urging member 505 is reduced to suppress the weight, and the angle regulating pin 505f cannot come into contact with the rotation limiting portion 506c due to the shaft tilt of the mirror urging member 505. Can be prevented.

Next, the operation of the mirror unit 5 will be described in detail with reference to FIGS. 7 to 9. FIG. 7 shows the mirror unit 5 in the mirror down state, FIG. 8 shows the operation of the mirror unit 5 in the rotating operation, and FIG. 9 shows the operation of the mirror unit 5, the mirror stopper 402, and the contact portion 401 in the mirror unit 5 mirror lockup state. It is a figure explaining.

In each of FIGS. 7 to 9, (a) is a view of the mirror unit 5 viewed from the incident optical axis direction (z direction), and (b) is a view showing a state in which the main mirror holder 502 is removed from (a). (C) is a view taken along the line cc of (b), and (d) is a view seen from the direction of arrow d of (a).

Further, in each of FIGS. 7 to 9, (e) is an enlarged view of part e of (c), and (f) is a view seen from the direction of arrow f of (b). In each of FIGS. 7 to 9, the mirror box 500 is not shown in each of the drawings except FIGS. 7 (e), 8 (e), and 9 (e).

FIG. 7 shows a mirror down state of the mirror unit 5. As shown in FIG. 7D, the drive pin 502c of the main mirror holder 502 is urged in the mirror down direction from a mirror drive system (not shown), and is stationary in the mirror down state. At this time, as shown in FIG. 7C, the mirror urging member 505 tries to rotate in the mirror lockup direction (clockwise direction) by receiving the spring force from the urging spring 507.

However, as shown in FIG. 7E, the urging pin 505a of the mirror urging member 505 is in contact with the cam region 504b-1 which is a part of the reversing cam 504b of the sub mirror holder 504. Since the sub mirror holder 504 is stationary in a state of being in contact with the angle adjusting pin 506b, in the mirror down state, the mirror urging member 505 attaches the sub mirror holder 504 in the mirror down direction around the rotation shaft hole 504a. It is stationary in a state of momentum.

At this time, as shown in FIG. 7E, a clearance S1 is formed between the urging pin 505a and the opening 500b of the mirror box 500, and the mirror urging member 505 has the urging pin 505a. It is possible to rotate in the clockwise direction in the figure in. Therefore, the urging force of the urging spring 507 is surely transmitted to the sub mirror holder 504. Further, as shown in FIG. 7 (f), a clearance S2 is formed between the angle restricting pin 505f and the rotation limiting portion 506c, and the mirror urging member 505 can rotate according to the clearance S2. It is possible.

FIG. 8 is a diagram showing a state in which the mirror unit 5 is in the process of rotating. The main mirror holder 502 starts mirror lockup when the drive pin 502c is pushed up in the mirror lockup direction by the mirror drive system. At this time, the sub mirror holder 504 is separated from the angle adjusting pin 506 and lifted around the rotation shaft 502b provided on the main mirror holder 502. As shown in FIG. 8E, the rotation angle of the sub mirror holder 504 is determined by the positional relationship between the reversing cam 504b in contact with the urging pin 505a and the rotation shaft hole 504a.

The rotation shaft hole 504a moves in the mirror lockup direction according to the mirror lockup operation of the main mirror holder 502. Therefore, if the shape of the reversing cam 504b and the position of the urging pin 505a are properly managed, the main mirror holder 502 and the sub mirror holder 504 move so that the relative angle becomes smaller with the mirror lockup operation, and the mirror lockup operation is performed. It abuts on the way and then works together.

At this time, the urging pin 505a and the opening 500b of the mirror box 500 are in contact with each other at the opening end 500b-1, and there is no clearance S1. That is, since the mirror box 500 receives the urging force of the urging spring 507, it is not necessary to drive the mirror drive system against the urging force of the urging spring 507 during the rotational operation of the sub mirror holder 504, and the mirror The driving force required for the drive system can be reduced. Since the mirror box 500 receives the urging force of the urging spring 507 even during the mirror down operation of the mirror unit 5, the driving force required for the mirror drive system can be reduced in the same manner.

FIG. 9 is a diagram showing a mirror lockup state of the mirror unit 5. In the mirror lockup state of the mirror unit 5, as shown in FIG. 9D, the main mirror holder 502 stops in a state where the tip end portion is in contact with the contact portion 401. At this time, as shown in FIG. 9C, the mirror urging member 505 tries to rotate in the clockwise direction in the drawing by receiving the spring force from the urging spring 507, as in the mirror down operation. However, in the mirror lockup state, as shown in FIG. 9E, the urging pin 505a is in contact with the cam region 504b-2 which is a part of the reversing cam 504b.

The sub mirror holder 504 and the main mirror holder 502 are in contact with each other and are in an integrated state, and the urging pin 505a and the opening 500b are not in contact with each other, and are between the urging pin 505a and the opening 500b. Clearance S1 is formed again. Therefore, the urging force of the urging spring 507 is transmitted to the sub mirror holder 504, and the sub mirror holder 504 is urged in the direction of being integrated with the main mirror holder 502.

As shown in FIG. 9 (f), a clearance S2 is formed between the angle restricting pin 505c and the rotation limiting portion 506c, so that the mirror urging member 505 can rotate according to the clearance S2. It has become. As a result, it is possible to prevent the parts from being stretched due to variations in the tolerances of the parts.

As described above, in the present embodiment, a large drive torque due to the reversal load of the toggle spring is not required, the mirror is urged in the down direction in the mirror down state, and the mirror is urged in the up direction in the mirror up state. Moreover, the number of parts and processing man-hours can be reduced.

(Second Embodiment)
Next, with reference to FIG. 10, a mirror unit 5 in a camera according to a second embodiment of the image pickup apparatus of the present invention will be described. In the present embodiment, the parts that overlap with the first embodiment are designated by the same reference numerals and only the differences will be described.

FIG. 10 is a cross-sectional view of a main part of the mirror unit 5, which corresponds to the cross section taken along line AA of FIG. 3 (c). If the mirror urging member 505 has backlash in the axial direction (x direction), the ability of the sub mirror holder 504 to suppress the bounce is reduced. Therefore, a thrust spring 508 such as a coil spring is installed between the sliding surface 506d of the angle adjusting plate 506 and the mirror urging member 505 so that the sliding surface 505d of the mirror urging member 505 is always in contact with the mirror box 500. The mirror urging member 505 is urged. This makes it possible to suppress the backlash of the mirror urging member 505 in the axial direction and more effectively suppress the bounce of the sub mirror holder 504.

At this time, the mirror urging member 505 is provided with a storage space 505 g for stably storing the thrust spring 508, but it is not always necessary to provide the mirror urging member 505, and the mirror urging member 505 is provided in the mirror box. There is no need to urge the 500 side. As long as the backlash in the axial direction of the mirror urging member 505 can be suppressed, for example, a similar storage space is provided on the sliding surface 500b on the mirror box 500 side, and the mirror urging member 505 is placed on the angle adjusting plate 506 side. You may try to urge. Other configurations and effects are the same as those in the first embodiment.

The configuration of the present invention is not limited to those exemplified in each of the above embodiments, and the material, shape, dimensions, form, number, arrangement location, etc. are appropriately changed as long as the gist of the present invention is not deviated. It is possible.

5 Mirror unit 500 Mirror box 500a Rotating shaft 500b Opening 503 Sub mirror 504 Sub mirror holder 504b Cam part 505 Mirror urging member 505a Biasing pin 506 Angle adjustment plate 507 Biasing spring

Claims (7)

A mirror holder that has a first cam area and a second cam area and rotates between a mirror lockup position and a mirror down position.
A mirror box with an opening and
A mirror urging member rotatably supported with respect to the mirror box,
The mirror urging member is rotatably arranged coaxially with the mirror urging member at a position where the mirror urging member is sandwiched between the mirror box and the mirror box. The angle adjustment member, which is fixed to the mirror box after the angle adjustment,
A urging spring for urging the mirror urging member is provided.
The mirror urging member is provided with a contact portion capable of contacting the opening end of the opening, and a follower capable of following the first cam region and the second cam region.
In the mirror down position, the follower abuts on the first cam region by the urging force of the urging spring to urge the mirror holder toward the mirror down position. At the mirror lockup position, the image pickup apparatus is characterized in that the follower abuts on the second cam region by the urging force of the urging spring to urge the mirror holder toward the mirror lockup position. The mirror urging member is characterized in that, between the mirror down position and the mirror up position, the contact portion is brought into contact with the opening end of the opening by the urging force of the urging spring. Item 1. The imaging apparatus according to item 1. The imaging device according to claim 1 or 2, wherein the mirror urging member is a molded plastic part. The mirror urging member has a plurality of tilt suppressing members that suppress shaft tilt, and the tilt suppressing member is at least one in each of a plurality of divided regions around the rotation axis of the mirror urging member. The imaging apparatus according to any one of claims 1 to 3, wherein the imaging apparatus is arranged. The imaging device according to claim 4, wherein at least three of the fall suppressing members are arranged. The imaging device according to claim 4 or 5, wherein at least one of the plurality of tilt suppressing members is arranged on a straight line connecting the rotation axis of the mirror urging member and the follower. According to any one of claims 1 to 6, a urging member for urging the mirror urging member in the axial direction is provided between the mirror box and the angle adjusting member. The imaging apparatus described.