Imaging device

Abstract

To provide an imaging device that is capable of suitably locking an imaging element.SOLUTION: An imaging device 1 comprises: a movable section 20 that holds an imaging element 21, is provided so as to be movable within an orthogonal plane orthogonal to an optical axis OA, and is provided with an engagement section 27 protruding toward one side of the optical axis OA direction; and a lock unit 40 that is arranged on one side of the movable section 20, is provided so as to be movable within an orthogonal plane orthogonal to the optical axis OA, and has a lock member 43 which moves within the orthogonal plane, engages with the engagement section 27 provided to the movable section, and locks the movable section. The lock member 43 moves on a straight line in the vertical direction passing through the optical axis OA.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an imaging device.

Background Art

[0002] Conventionally, an imaging device has been disclosed that corrects camera shake by driving an image sensor when camera shake is detected (see, for example, Patent Document 1). In this conventional imaging device, a mechanism for holding the image sensor at a predetermined position is provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The imaging device of the present invention includes a movable unit that holds an image sensor, is provided so as to be movable within an orthogonal plane orthogonal to the optical axis, and is provided with an engaging portion that protrudes toward one side in the optical axis direction; and a lock unit that is disposed on the one side of the movable unit, is provided so as to be movable within an orthogonal plane orthogonal to the optical axis, and has a lock member that moves within the orthogonal plane and engages with the engaging portion provided on the movable unit to lock the movable unit. The lock member is configured to move along a straight line in the vertical direction passing through the optical axis.

Brief Description of the Drawings

[0005]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0006] Hereinafter, with reference to the drawings and the like, the camera 1 as an embodiment of the imaging device will be described. FIG. 1 is a schematic diagram showing the camera 1 of the embodiment and the interchangeable lens 2 detachable from the camera 1. In the embodiment, the camera 1 with a detachable interchangeable lens 2 will be described, but the camera 1 of the present invention may be a lens-integrated camera.

[0007] (Camera 1) The camera 1 includes a fixed part 30 fixed to the camera 1, a movable part 20 including the imaging element 21 that moves with respect to the fixed part 30, a lock unit 40 that restricts the movement of the movable part 20, a release switch 11, a display unit 12, a shake detection sensor 13, a drive unit 3 that drives the movable part 20 with respect to the fixed part 30, a position detection unit 4, a control unit 14, and an operation unit 15.

[0008] The release switch 11 is a member for performing a shooting operation of the camera 1, and operates the timing of driving a shutter (not shown) and the like.

[0009] The imaging element 21 is provided on the planned focal plane of the imaging optical system of the interchangeable lens 2, and based on the control of the control unit 14, photoelectrically converts the subject image light incident through the imaging optical system of the interchangeable lens 2 to generate a signal. The imaging element 21 is composed of, for example, a CCD, a CMOS, or the like.

[0010] The display unit 12 is provided on the rear surface of the camera 1, and is a color liquid crystal display that displays the photographed subject image (including still images and moving images such as live view images) and information related to operations (menus) and the like.

[0011] The shake detection sensor 13 is an acceleration sensor or an angular velocity sensor, and detects the shake caused by the hand shake of the camera 1.

[0012] The control unit 14 performs shooting control of the imaging element 21 when the release switch 11 is pressed. Further, the control unit 14 performs processes such as noise processing and A / D conversion on the signal output by the imaging element 21, generates image data, and displays it on the display unit 12. Furthermore, the control unit 14 detects the target position of the imaging element 21 based on the shake signal of the imaging element 21 detected by the shake detection sensor 13. Then, the control unit 14 calculates the driving amount for correcting the shake of the imaging element 21 based on the detected target position, and drives the imaging element 21 via the driving unit 3 based on the calculated driving amount.

[0013] FIG. 2 is a perspective view of the movable part 20, the fixed part 30, and the lock unit 40 viewed obliquely from the rear, and FIG. 3 is a perspective view of the movable part 20, the fixed part 30, and the lock unit 40 viewed obliquely from the front.

[0014] In the following figures, for ease of explanation and understanding, an XY orthogonal coordinate system is provided as appropriate. In this coordinate system, when the photographer shoots a horizontally long image with the optical axis OA horizontal, the direction toward the left as viewed from the photographer at the position of the camera 1 (positive position) is defined as the X plus direction. Also, the direction upward at the positive position is defined as the Y plus direction. Further, the subject side in the direction of the optical axis OA is the front, the opposite side is the rear, the Y plus side is the top, the Y minus side is the bottom, and the rear side surface is the rear surface for explanation.

[0015] (Movable part 20) The movable part 20 is movable within the XY plane, which is an orthogonal plane orthogonal to the optical axis OA with respect to the fixed part 30. The movable part 20 includes a movable frame 22 that holds the imaging element 21, and the imaging element 21 is attached to the front surface of the movable frame 22.

[0016] (Drive unit 3 on the movable part 20 side) On the minus side in the X direction of the area where the imaging element 21 is arranged in the movable frame 22, a coil 23 for driving in the X direction as the driving unit 3 is attached. On the minus side (lower side) in the Y direction of the imaging element 21, coils 24 and 25 for driving in the Y direction and for driving in the rotational direction as the driving unit 3 are attached.

[0017] (Engaging portion 27) At the edge of the movable frame 22, in the embodiment, two substantially columnar pin-shaped engaging portions 27 protruding rearward in the direction of the optical axis OA are provided. However, it is not limited to two, and more may be provided. The two engaging portions 27 in the embodiment are substantially at the center in the X direction of the movable frame 22, at positions equal to each other in the Y direction from the optical axis OA, and are arranged spaced apart from each other at both edge portions in the Y direction of the movable frame 22. Note that the arrangement of the two engaging portions 27 is not limited to the above example. For example, instead of arranging the engaging portions 27 on the plus side and the minus side in the Y direction respectively, they may be arranged on the plus side and the minus side in the X direction respectively.

[0018] Note that in the embodiment, the engaging portion 27 is pin-shaped, but it is not limited to this. As long as it is a shape that engages with a locking member 43 described later, it does not have to be pin-shaped. In the embodiment, the engaging portion 27 extends rearward in the direction of the optical axis OA. The two engaging portions 27 are arranged at positions facing each other with respect to the optical axis OA, that is, in opposite directions at equal distances from the optical axis OA, and the straight line connecting the centers of the two engaging portions 27 passes through the optical axis OA.

[0019] (Recess 27a) FIG. 4 is a rear view of the engaging portion 27 and a part of the lock unit 40, where (a) shows the unlocked state and (b) shows the locked state. The locking operation will be described later. A concave portion 27a that is recessed in a substantially mountain shape (substantially fan shape) is provided on the front end surface of the engaging portion 27. In the embodiment, the top of the mountain shape of the concave portion 27a is located on or near the central axis of the engaging portion 27, but it is not limited to this. However, it is preferable that the top of the mountain shape of the concave portion 27a is located on the straight line connecting the axis of the engaging portion 27 and the optical axis OA. It is also preferable that the center of the portion corresponding to the skirt of the mountain shape of the concave portion 27a is located on the straight line connecting the optical axis OA and the axis of the engaging portion 27. In the embodiment, the concave portion 27a is substantially mountain-shaped, but it is not limited to this, and for example, it may be arc-shaped. Further, the concave portion 27a does not necessarily need to be formed over the entire outer circumference of the engaging portion 27 in the axial direction, and it may be formed by cutting out a part of the outer circumference of the engaging portion 27.

[0020] (Fixing portion 30) The fixing portion 30 includes a fixing frame 31 fixed to the housing of the camera 1. The fixing portion 30 covers the rear side of the portion of the movable portion 20 where the imaging element 21 is disposed.

[0021] (Hole portion 37) Two hole portions 37 are arranged at equal positions in the Y direction from the optical axis OA on both edge portions in the Y direction of the fixing frame 31, and are spaced apart from each other. The position where the hole portion 37 is provided substantially corresponds to the position where the engaging portion 27 is provided.

[0022] (Drive portion 3 on the fixing portion 30 side) On the minus side in the X direction of the fixing frame 31, a magnet 33 for driving in the X direction as the drive portion 3 is attached, and on the minus side (lower side) in the Y direction of the imaging element 21, magnets 34 and 35 for driving in the Y direction and for driving in the rotational direction as the drive portion 3 are attached. The magnets 33, 34, and 35 are provided at positions corresponding to the coils 23, 24, and 25, respectively.

[0023] (Position detection portion 4) The camera 1 is provided with a position detection unit 4 (shown in FIG. 1). The position detection unit 4 detects the position of the movable unit 20 with respect to the fixed unit 30. In the present embodiment, the position detection unit 4 is, for example, a Hall element 26 attached to the movable unit 20 and a position detection magnet 36 attached to the fixed unit 30, but is not limited thereto, and may be, for example, a light emitting unit and a light receiving unit (PSD). Instead of providing the position detection magnet 36, the driving magnets 33, 34, 35 may also serve as a position detection function.

[0024] (Drive unit 3) As described above, the coils 23, 24, 25 provided on the movable frame 22 and the magnets 33, 34, 35 provided on the fixed frame 31 constitute the drive unit 3 as a voice coil motor (VCM).

[0025] The movable unit 20 and the fixed unit 30 are urged toward each other by a spring member via three balls (not shown), whereby the movable frame 22 is supported so as to be movable in the X-axis direction, the Y-axis direction, and the rotational direction around the optical axis OA with respect to the fixed frame 31. Instead of urging the movable unit 20 and the fixed unit 30 toward each other by a spring member, a magnet may be provided on either the movable unit 20 or the fixed unit 30, and the other metal part may be attracted by the magnet so as to be urged toward each other.

[0026] When a current is passed through the coils 23, 24, 25, an electromagnetic force acts on the portions of the coils 23, 24, 25 where the direction of the current is orthogonal to the magnetic field lines of the magnets 33, 34, 35, and the movable unit 20 is driven with respect to the fixed unit 30. When the direction of the current flowing through the coils 23, 24, 25 is reversed, the movable unit 20 is driven in the reverse direction. Also, the force acting on the movable unit 20 can be changed by the magnitude of the current flowing through the coils 23, 24, 25.

[0027] When current is flowing through coils 23, 24, and 25, the movable part 20 is held at a predetermined position. However, when the power supply to coils 23, 24, and 25 is stopped, the force holding the movable part 20 disappears. At this time, since the movable part 20 can move freely within the movable range inside the housing of camera 1, when it falls in the direction of gravity due to its own weight when the power supply is stopped and collides with other parts inside the housing, or when camera 1 is shaken, etc., it may collide with other parts and the movable part or the like may be damaged.

[0028] (Lock unit 40) Therefore, in the embodiment, a lock unit 40 for fixing the movable part 20 when it is not energized is provided. The lock unit 40 is disposed on the rear surface side of the fixing part 30 inside the housing of camera 1. FIG. 5 is an exploded perspective view of the lock unit 40 as viewed obliquely from the rear.

[0029] The lock unit 40 includes a base part 46 disposed on the front side and a cover part 41 disposed at the rear. Between the base part 46 and the cover part 41, a worm gear 47 and a second pinion gear 48 which are intermediate gear parts held by the base part 46, an actuator 44, a first pinion gear 45 held on the shaft of the actuator 44, two lock members 43, and a cam plate 42 are disposed. Note that instead of providing the worm gear 47 and the second pinion gear 48 separately as intermediate gear parts, the worm gear 47 and the second pinion gear 48 may be integrated and formed as one part.

[0030] (Base part 46) On the surface of the base part 46 on the rear side in the direction of the optical axis OA, a cam plate holding shaft 46a extending rearward in the direction of the optical axis OA and a gear holding part 46b disposed on the minus X side of the cam plate holding shaft 46a are provided.

[0031] The cam plate 42 is rotatably held by the cam plate holding shaft 46a. In the gear holding portion 46b, a holding shaft (not shown) extending in a direction orthogonal to the optical axis OA is disposed. On the minus Y side of the holding shaft, a second pinion gear 48 is attached to the holding shaft, and a worm gear 47 is attached to the holding shaft above the second pinion gear 48. Therefore, when the holding shaft rotates due to the rotation of the second pinion gear 48, the worm gear 47 also rotates. When the worm gear 47 and the second pinion gear 48 are integrally formed as one part, the holding shaft may be fixed to the base portion 46, and the integrated intermediate gear portion (the worm gear 47 and the second pinion gear 48) may be rotatably supported with respect to the holding shaft.

[0032] Further, two through holes 46c are provided in the base portion 46. The two through holes 46c are at equal positions in the Y direction from the optical axis OA, and the straight line connecting the two through holes 46c passes through the optical axis OA. The positions where the through holes 46c are provided substantially correspond to the positions where the engaging portion 27 and the hole portion 37 are provided. Furthermore, a guide frame 46f for guiding the movement of a lock member 43 described later is provided in the base portion 46.

[0033] (Actuator 44) The actuator 44 is supported on the minus Y side of the gear holding portion 46b of the base portion 46. The rotation shaft 44a of the actuator 44 is rotatable with respect to the base portion 46, and a first pinion gear 45 having a gear is attached to the lower end of the rotation shaft 44a. The first pinion gear 45 meshes with the second pinion gear 48. When the worm gear 47 is directly connected to the rotation shaft 44a of the actuator 44, the first pinion gear 45 and the second pinion gear 48 may not be provided.

[0034] (Lock member 43) In the embodiment, two locking members 43U and 43D are arranged on the plus side and the minus side (up and down) in the Y direction with respect to the optical axis OA. The locking members 43U and 43D are identical in shape to each other and are arranged on a straight line passing through the optical axis OA so as to be symmetric with respect to the optical axis OA. That is, they are arranged in opposite directions on a straight line passing through the optical axis OA. The locking member 43 is arranged in a guide frame 46f provided on the base portion 46. The side surface of the locking member 43 is guided by the inner side surface of the guide frame and moves on a straight line passing through the optical axis OA. At this time, the two locking members 43U and 43D can move while maintaining a state where the distances from the optical axis OA are equal to each other as the following-described cam follower 43a moves in the cam groove 42b of the cam plate 42.

[0035] When there is no need to distinguish and explain, the locking members 43U and 43D are collectively described as the locking member 43. Fig. 4(a) shows the second position when the locking member 43 is not locking the movable part 20 (when unlocking), and Fig. 4(b) shows the first position when the locking member 43 is locking the movable part 20.

[0036] (Cam follower 43a) As shown in Figs. 4 and 5, the locking member 43 is provided with a cam follower 43a that engages with the cam groove 42b of the cam plate 42 on the rear surface on the optical axis OA side. One end of the cam groove 42b is located on the center side of the cam plate 42, and the other end is located on the outer peripheral side of the cam plate 42.

[0037] (U-shaped portion 43c) In addition, a U-shaped portion 43c for holding the engaging portion 27 is provided at the radially outer end of the locking member 43 when centered on the optical axis OA. Furthermore, a taper portion 43d, whose width is wider than that of the base end side of the U-shaped portion 43c, is provided at the entrance portion of the U-shaped portion 43c of the lock member 43. That is, the opening of the entrance portion of the U-shaped portion 43c is wider than other portions. Instead of providing the taper portion 43d at the entrance portion of the U-shaped portion 43c, an R-shaped curved surface may be formed.

[0038] (Elastic portion 43b) An elastic portion 43b is attached to the rear surface side of the base end portion of the U-shaped portion 43c. The elastic portion 43b presses the engaging portions 27 in a direction away from each other while the engaging portions 27 are held by the U-shaped portion 43c.

[0039] In the embodiment, the elastic portion 43b is a leaf spring and has a convex portion 43e protruding in a direction facing the engaging portion 27 at the center. The convex portion 43e is formed by bending the leaf spring so as to fit into the mountain-shaped concave portion 27a of the engaging portion 27. With the engaging portion 27 held by the U-shaped portion 43c, the convex portion 43e of the elastic portion 43b fits into the concave portion 27a of the engaging portion 27 and presses the surface on the optical axis OA side of the concave portion 27a radially outward. In this embodiment, an example in which the elastic portion 43b is formed as a leaf spring is shown, but it may be formed as a wire spring instead of the leaf spring.

[0040] (Cam plate 42) FIG. 6 is a view of the cam plate 42 seen from the front side. The cam plate 42 is a disc member and is rotatable about the optical axis OA. A gear 42a is provided on the outer periphery of the cam plate 42.

[0041] (Cam groove 42b) In addition, two cam grooves 42b are provided on the front surface, which is the surface of the cam plate 42 on the lock member 43 side. The cam followers 43a of the lock member 43 are respectively engaged with the cam grooves 42b. One end of the cam groove 42b is at the center of the cam plate 42, that is, on the optical axis OA side, and the other end of the cam groove 42b is on the outer peripheral side of the cam plate 42, that is, at a position radially away from the optical axis OA.

[0042] Then, as shown in FIGS. 4(b) and 6, the two side edges 42ba of the cam groove 42b on the outer peripheral side of the cam plate 42 at the other end side are parallel to each other, orthogonal to the optical axis OA, and further extend orthogonal to the radial direction. That is, as shown in FIG. 4(b), when the locking member 43 locks the engaging portion 27, the two side edges of the portion of the cam groove 42b where the cam follower 43a is located are parallel to each other and orthogonal to the moving direction of the locking member 43 within the orthogonal plane. Therefore, the movement of the engaging portion 27 in the Y direction is restricted by the side edges 42ba. Further, the movement of the locking member 43 in the X direction is restricted by a guide frame 46f (shown in FIG. 5) that guides the movement of the locking member 43. As a result, the movement of the locking member 43 within the orthogonal plane is restricted. On the other hand, the two side edges 42bb of the cam groove 42b on the one end side of the cam plate 42 on the optical axis OA side are also parallel to each other, orthogonal to the optical axis OA, and further extend orthogonal to the radial direction. Therefore, even when not locked (when unlocking) as shown in FIG. 4(a), the movement of the locking member 43 within the orthogonal plane is restricted.

[0043] (Cover portion 41) The cover portion 41 is provided with a holding portion (not shown) that holds the tip of the cam plate holding shaft 46a of the base portion 46, and forms the outer frame of the locking unit 40 in combination with the base portion 46. Further, two through holes 41c are provided in the cover portion 41. The two through holes 41c are located at equal distances from the optical axis OA, and the straight line connecting the two through holes 41c passes through the optical axis OA. If the cam plate holding shaft 46a can be held as a cantilever by giving sufficient bending strength to the cam plate holding shaft 46a, the cover portion 41 can be omitted.

[0044] The through hole 46c of the base portion 46 and the through hole 41c of the cover portion 41 are formed at the same position, and when the cover portion 41 and the base portion 46 are combined, they become a through hole 40c that penetrates the locking unit 40. The two through holes 40c are at equal distances from the optical axis OA, that is, corresponding to the position where the engaging portion 27 is provided, and the straight line connecting the two through holes 40c passes through the optical axis OA.

[0045] The engaging portion 27 provided on the movable portion 20 is inserted into the hole portion 37 provided on the fixed portion 30, and further inserted into the through hole 46c of the base portion 46 of the lock unit 40 and the through hole 40c of the cover portion 41.

[0046] (Operation of the locking member 43) During shooting, the locking member 43 of the lock unit 40 is in a second position on the optical axis OA side, separated from the engaging portion 27 as shown in Fig. 4(a). At this time, the locking member 43 is in a non-locked state where it does not engage with the engaging portion 27 and does not restrict the movement of the movable portion 20 relative to the fixed portion 30.

[0047] In this state, for example, when the photographer selects to turn off the main power of the camera 1, the actuator 44 rotates before the power is completely turned off. Then, the first pinion gear 45 attached to the rotation shaft of the actuator 44 rotates, and the second pinion gear 48 that meshes with the first pinion gear 45 rotates. The rotation of the second pinion gear 48 causes the holding shaft to rotate, thereby rotating the worm gear 47. Then, since the gear 42a of the cam plate 42 meshes with the worm gear 47, the cam plate 42 rotates.

[0048] When the cam plate 42 rotates, the locking member 43 moves in the radial direction orthogonal to the optical axis OA within the guide frame 46f because the cam follower 43a engages with the cam groove 42b of the cam plate 42.

[0049] When the locking member 43 moves in the radial direction with respect to the optical axis OA, the engaging portion 27 is sandwiched and held inside the U-shaped portion 43c, and the movable portion 20 is locked with respect to the fixed portion 30. That is, the locking member 43 is in a first position that restricts the movement of the movable portion 20 relative to the fixed portion 30.

[0050] (Effect of moving in the radial direction with respect to the optical axis OA direction) Here, different from the embodiment, when the locking member 43 locks the movable part 20 to the fixed part 30 by moving along the optical axis OA instead of in the radial direction, a thickness in the direction of the optical axis OA is required as a space for the locking member 43 to move along the optical axis OA direction, and the camera 1 becomes larger. However, in the embodiment, the locking member 43 moves in the radial direction with respect to the optical axis OA, engages with the engaging portion 27, and locks the movable part 20 to the fixed part 30. Therefore, the camera 1 can be made thinner. Further, since the locking member 43 moves linearly within a plane orthogonal to the optical axis OA, the moving space of the locking member 43 can be suppressed.

[0051] (Taper portion 43d) Here, a Hall element is attached to the movable part 20, and a position detection magnet 36 is attached to the fixed part 30, thereby detecting the position of the movable part 20. However, depending on the temperature, the position detection of the movable part 20 may become inaccurate, and the position of the movable part 20 may deviate from the target position. Then, there is a possibility that the center of the engaging portion 27 is not on the straight line along which the locking member 43 moves. However, in the embodiment, at the entrance portion of the U-shaped portion 43c that holds the engaging portion 27 provided at the tip of the locking member 43, a taper portion 43d that is wider than the base end side of the U-shaped portion 43c is provided. That is, the opening of the entrance portion of the U-shaped portion 43c is widened. Therefore, even when the position of the engaging portion 27 varies, the engaging portion 27 can be surely guided into the U-shaped portion 43c. Therefore, the locking operation of the movable part 20 can be surely performed.

[0052] (Effect of the elastic portion 43b) Further, when the locking member 43 holds the engaging portion 27, the convex portion 43e of the elastic portion 43b fits into the concave portion 27a of the engaging portion 27 and presses the surface on the optical axis OA side of the concave portion 27a radially outward. As a result, the two engaging portions 27 disposed on both sides of the optical axis OA are elastically pressed away from each other. Therefore, when the locking member 43 locks the engaging portion 27, play in the movable portion 20 is prevented.

[0053] (Effect of the shape of the cam groove 42b) When the locking member 43 locks the engaging portion 27, the cam follower 43a is located at an end portion close to the outer periphery of the cam groove 42b provided in the cam plate 42. The two side edges at the end close to the outer periphery of the cam groove 42b are parallel to each other and orthogonal to the moving direction of the locking member 43 in the orthogonal plane. That is, the cam follower 43a is held between one and the other in the radial direction. Further, the normal line at the contact portion between the cam follower 43a and the cam groove 42b passes through the optical axis OA, that is, the rotation center of the cam plate 42. For this reason, even if a force in the Y direction acts on the locking member 43, a force for rotating the cam plate 42 does not act, so the movement of the locking member 43 in the Y direction is restricted. Since the movement of the locking member 43 in the X direction is restricted by the guide frame 46f that guides the movement of the locking member 43, the movement of the locking member 43 in the orthogonal plane is restricted.

[0054] (Effect of providing two engaging portions 27) When the engaging portion 27 is provided at one location, the movement of the engaging portion 27 in one direction in the Y direction (plus Y direction or minus Y direction) is restricted by the locking member 43, but it can move freely in other directions. On the other hand, by providing the engaging portion 27 at two locations, the movement of the engaging portion 27 in both directions in the Y direction (plus Y direction and minus Y direction) is restricted by the locking member 43. Therefore, the movement of the movable portion 20 in the Y direction with respect to the fixed portion 30 can be reliably restricted. Since the movement of the engaging portion 27 in the X direction is restricted by the U-shaped portion 43c, the movement of the engaging portion 27 in the X and Y directions, that is, in the orthogonal plane, is restricted. As a result, the movement of the movable portion 20 in the orthogonal plane with respect to the fixed portion 30 is restricted. As a result, since the movable portion 20 is fixed even in the power-off state, it is not necessary to always energize, and power consumption can be suppressed. In the embodiment, the form held at two locations has been described, but it may be three or more locations. In addition, at the time of locking shown in FIG. 4(b), the locking member 43 is elastically pressed in a direction approaching each other from the two engaging portions 27 disposed on both sides sandwiching the optical axis OA via the elastic portion 43b. In this case, the cam follower 43a is pressed against the side 42ba1 on the optical axis OA side of the two side edges 42ba of the cam groove 42b on the outer peripheral side of the cam plate 42, and the engaging portion 27 is restricted in its movement in the Y direction by the two side edges 42ba1 on the optical axis OA side.

[0055] As described above, since no force for rotating the cam plate 42 acts on the locking member 43 in the power-off state, the locking member 43 does not move. Therefore, since the movable portion 20 including the imaging element 21 is fixed even in the power-off state, the movable portion 20 does not fall due to gravity or move due to the vibration during carrying. Thus, the movable portion 20 including the imaging element 21 can be held without consuming power. In addition, at the time of unlocking (unlocking) shown in FIG. 4(a) where the locking member 43 does not lock the engaging portion 27, the cam follower 43a is located at an end portion of the cam groove 42b provided in the cam plate 42 close to the optical axis OA. The two side edges 42bb at the end portion of the cam groove 42b close to the optical axis OA are parallel to each other and orthogonal to the moving direction of the locking member 43 in the orthogonal plane. In addition, the movement of the locking member 43 in the X direction is restricted by a guide frame 46f (shown in FIG. 5) that guides the movement of the locking member 43. For this reason, the movement of the locking member 43 in the orthogonal plane is restricted. As a result, since the locking member 43 does not move freely even in the power-off state at the time of unlocking, it is not necessary to constantly energize, and power consumption can be suppressed.

[0056] Note that the holding of the movable portion 20 may be made selectable by the photographer from the operation unit 15 not only when the power is turned off. Also, the movable portion 20 may be automatically held depending on the shooting mode.

[0057] In addition, in the embodiment, the fixing portion 30 is provided with two hole portions 37 through which the engaging portion 27 is inserted, but no other opening for the locking operation is provided on the rear surface side of the imaging element 21. Therefore, when the temperature of the imaging element 21 rises during imaging, the fixing frame 31 of the fixing portion 30 can be used as a heat dissipation path, and a sufficient area of the heat dissipation mechanism can be ensured, so that heat can be efficiently dissipated in a portion close to the heat source.

[0058] In addition, by disposing the engaging portions 27 at the edges instead of the rear side of the imaging element 21, the distance between the engaging portions 27 can be increased. Therefore, the movable portion 20 can be locked with higher positional accuracy.

[0059] For example, when the retraction of the locking member 43 at the time of unlocking is performed by the biasing force of a spring, different from the embodiment, if the standby position of the engaging portion 27 is displaced, the frictional force between the locking member 43 and the engaging portion 27 increases, and there is a possibility that the retraction of the locking member 43 cannot be performed accurately and reliably. Although it is conceivable to try to solve this by increasing the biasing force of the elastic body, in this case, there is a drawback that the operating load at the time of locking increases. However, in the embodiment, at the time of unlocking, the actuator 44 is rotated in the reverse direction, so that the locking member 43 can be retracted from the engagement position with the engaging portion 27 with sufficient force even at the time of unlocking. Therefore, the movement of the locking member 43 can be performed accurately and reliably.

[0060] As described above, the preferred embodiments have been described, but the present invention is not limited to these embodiments, and various modifications and changes are possible.

Explanation of Reference Numerals

[0061] OA optical axis 1 Camera 20 Movable portion 21 Imaging element 22 Movable frame 27 Engaging portion 27a Concave portion 30 Fixing portion 31 Fixed frame 37 Hole part 40 Lock unit 42 Cam plate 42a Gear 42b Cam groove 43 Lock member 43a Cam follower 43b Elastic part 43c U-shaped part 43d Taper part 43e Convex part 44 Actuator 44a Rotating shaft 45 First pinion gear 46 Base part 46a Cam plate holding shaft 46b Gear holding part 46c Through hole 47 Worm gear 48 Second pinion gear

Claims

1. a movable section that holds the image sensor, is movable within a plane perpendicular to the optical axis, and has an engagement section that protrudes toward one side in the optical axis direction; a lock unit that is disposed on the one side of the movable part, is provided so as to be movable within an orthogonal plane orthogonal to the optical axis, and has a lock member that moves within the orthogonal plane to engage with the engaging portion provided on the movable part to lock the movable part, An imaging device, wherein the locking member moves in a vertical straight line passing through the optical axis.

2. a movable section that holds the image sensor, is movable within a plane perpendicular to the optical axis, and has an engagement section that protrudes toward one side in the optical axis direction; a lock unit that is disposed on the one side of the movable part, is provided so as to be movable within an orthogonal plane orthogonal to the optical axis, and has a lock member that moves within the orthogonal plane to engage with the engaging portion provided on the movable part to lock the movable part, The locking member engages with the engaging portion by moving from the optical axis side to the outside in a radial direction with the optical axis as the center.

3. The imaging device according to claim 1 , wherein the locking member has a U-shaped portion that holds the engaging portion.

4. 3. The imaging device according to claim 1, wherein the locking member includes two locking members, one above the other with respect to the optical axis, the two locking members being arranged symmetrically with respect to each other with respect to the optical axis.

Images