JP2021071494A - Optical unit with shake correction function - Google Patents

Abstract

To reduce size and improve a degree of freedom in design of a rolling drive mechanism in an optical unit with a shake correction function.SOLUTION: An optical unit 1 with a shake correction function has: a rolling drive mechanism 28 that rotates a movable body 20 around an optical axis L; and a drive mechanism for shake correction 25 that oscillates the movable body 20 around a first axis R1 and a second axis R2 intersecting with the optical axis L and orthogonal to each other. The rolling drive mechanism 28 includes a driving member 200 that is composed of a shape memory alloy. The driving member 200 is attached to a rotation support mechanism 21 and is bridged between portions separated in a circumferential direction when seen from the direction of the optical axis L. Since the driving member 200 shrinks to a memorized shape when a temperature of the same reaches a predetermined temperature due to energization, the energization state of the driving member 200 is controlled to change a length of the driving member 200 when seen from the direction of the optical axis L, to thereby allow rotation of the movable body 20 around the optical axis L.SELECTED DRAWING: Figure 3

Description

The present invention relates to an optical unit with a runout correction function that corrects runout of an optical module.

The optical unit mounted on the mobile terminal or mobile body swings or rotates the movable body on which the optical module is mounted in order to suppress the disturbance of the captured image when the mobile terminal or mobile body moves. Some are equipped with a correction mechanism. Patent Document 1 discloses this kind of optical unit with a runout correction function. The optical unit with a runout correction function of Patent Document 1 has a ball bearing (rotational support mechanism) that rotatably supports a movable body around an optical axis, and swingably supports the movable body around an axis that intersects the optical axis. It is equipped with a gimbal mechanism (swing support mechanism). Further, as a runout correction drive mechanism, a rolling magnetic drive mechanism that rotates a movable body around an optical axis to perform rolling correction, and a swing magnetic drive mechanism that swings the movable body to correct runout in the pitching direction and the yawing direction. It has a drive mechanism.

Japanese Unexamined Patent Publication No. 2015-82072

The optical unit with a runout correction function of Patent Document 1 uses a magnetic drive mechanism as a drive mechanism for rotating a movable body around an optical axis. When using a magnetic drive mechanism, a space for arranging magnets and coils is required. Further, in order to obtain the required driving force, there is a limit to the miniaturization of the magnet and the coil. Further, since the arrangement of the magnet and the coil is limited, the degree of freedom of arrangement is small.

In view of these points, an object of the present invention is to reduce the size of the drive mechanism for rolling correction and improve the degree of freedom in design.

In order to solve the above problems, the optical unit with a runout correction function of the present invention includes a movable body including an optical element and a rotation support mechanism that rotatably supports the movable body about the optical axis of the optical element. A gimbal mechanism that rotatably supports the rotation support mechanism around the first axis intersecting the optical axis and rotatably around the optical axis and the second axis intersecting the first axis, and the above. A fixed body that supports the movable body via a gimbal mechanism and the rotation support mechanism, a rolling drive mechanism that rotates the movable body around the optical axis, and the movable body around the first axis and the second axis. The rolling drive mechanism includes a drive member made of a shape memory alloy, and the drive member includes a first portion connected to the movable body and the above-mentioned A second portion connected to a fixed body is provided, the first portion and the second portion are separated from each other in the circumferential direction around the optical axis, and the driving member returns to a storage shape when it reaches a predetermined temperature by energization. The movable body is rotated around the optical axis by controlling the energized state of the driving member and changing the length of the driving member when viewed from the direction of the optical axis.

According to the present invention, the rolling drive mechanism that rotates the movable body around the optical axis includes a drive member made of a shape memory alloy, and the drive member extends between two locations separated in the circumferential direction and is a movable body. And the fixed body are connected. Therefore, by energizing the drive member, the length of the drive member can be changed to rotate the movable body. Therefore, rolling correction can be performed. Further, such a drive member can be made smaller in shape and has a high degree of freedom in arrangement. Therefore, the rolling drive mechanism can be miniaturized and the degree of freedom in design can be improved.

In the present invention, the driving member has a reference shape in the process of returning to the storage shape by energizing a reference current, and when the driving member has the reference shape, the movable body is at the origin position of rolling correction. By reducing the current that is positioned and energizes the drive member from the reference current, the movable body is rotated from the origin position in the first rotation direction, and the current that energizes the drive member is increased from the reference current. As a result, it is possible to adopt a configuration in which the movable body is rotated from the origin position in the second rotation direction opposite to the first rotation direction. In this way, by setting the origin position of the rolling correction to the position in which the driving member is energized, the movable body can be rotated in both the first rotation direction and the second rotation direction only by increasing or decreasing the current. Further, even if the number of driving members is one, the movable body can be rotated in both the first rotation direction and the second rotation direction. Therefore, it is possible to reduce the size of the rolling drive mechanism and improve the degree of freedom in design.

Alternatively, in the present invention, the drive member is provided with an urging member that generates an urging force in the direction of extending the drive member from the storage shape, and by energizing the drive member, the drive member is changed to the memory shape and is movable. The body is rotated in the first rotation direction, and the movable body is rotated in the second rotation direction opposite to the first rotation direction by the urging force of the urging member in a state where the driving member is not energized. The configuration can be adopted. As described above, by using the urging member, it is not necessary to continue the energization while holding the movable body at the origin position of the rolling correction. Therefore, the drive control of the rolling drive mechanism is easy.

In the present invention, it is preferable that the plurality of driving members are provided at a plurality of positions in the circumferential direction about the optical axis, and the plurality of driving members are electrically energized in synchronization with each other. In this way, the driving force can be increased. In addition, the portion on which the driving force acts can be dispersed in the circumferential direction. Therefore, the movement and posture of the movable body in the rolling correction can be stabilized.

In the present invention, it is preferable that the plurality of driving members have substantially the same position in the optical axis direction and are configured to be rotationally symmetric with respect to the optical axis. In this way, it is possible to prevent the movable body from tilting. In addition, the driving force can be applied rotationally symmetrically. Therefore, the movement and posture of the movable body in the rolling correction can be stabilized.

In the present invention, the rolling drive mechanism includes a plurality of the drive members, the plurality of drive members include a first drive member and a second drive member, the first drive member is energized, and the first drive member is energized. By not energizing the second drive member, the first drive member is returned to the memory shape to rotate the movable body in the first rotation direction, and the second drive member is deformed from the memory shape. By energizing the second drive member and not energizing the first drive member, the second drive member is returned to the memory shape and the movable body is moved in the direction opposite to the first rotation direction. It is preferable to rotate the first driving member in the rotation direction and to deform the first driving member from the memory shape. In this way, the movable body can be rotated in both the first rotation direction and the second rotation direction only by controlling the energization of the drive member, and a member that generates an urging force is not required. Therefore, it is possible to reduce the size of the rolling drive mechanism and improve the degree of freedom in design.

In the present invention, the driving member is preferably a wire made of a shape memory alloy, and one of the first portion and the second portion is preferably a bent portion obtained by folding back the wire. In this way, the drive member can be made smaller and lighter, and the arrangement space is small.
Further, the wire provided with the bent portion can be locked to the hook or the convex portion. Therefore, the mounting structure of the drive member can be simplified and the mounting work is easy.

In the present invention, the rotation support mechanism slides in contact with the plate roll fixed to the movable body, the plate holder facing the plate roll in the optical axis direction, and the plate roll and the plate holder. The plate holder is connected to the fixed body via the gimbal mechanism, and the plate roll has a plate roll annular portion that overlaps the movable body when viewed from the optical axis direction. A pair of plate roll extending portions projecting from the plate roll annular portion on both sides in the second axial direction are provided, and the plate holder includes a plate holder annular portion facing the plate roll annular portion and the plate holder annular portion. A pair of plate holder extension portions projecting from the portion on both sides in the first axial direction are provided, and one of the pair of plate roll extension portions and the pair of plate holder extension portions locks the bent portion. It is preferable that the other of the pair of plate roll extending portions and the pair of plate holder extending portions includes a wire locking portion, and the other of the pair of plate holder extending portions includes a wire fixing portion to which the end portion of the wire is fixed. In this way, the rolling drive mechanism can be attached to the rotation support mechanism by passing a wire between the plate roll extension portions and the plate holder extension portions that are adjacent to each other in the circumferential direction. Therefore, the mechanism for rolling correction can be integrated. Further, the rolling drive mechanism does not protrude significantly to the outer peripheral side of the rotation support mechanism, and is arranged within the range of the rotation support mechanism also in the optical axis direction. Therefore, the arrangement space of the rolling drive mechanism is small, and there is little possibility of interference with other mechanisms. Therefore, it is advantageous for miniaturization of the optical unit with the runout correction function.

In the present invention, the rolling drive mechanism is arranged in two sets, one end of the movable body on one side in the optical axis direction and the other end of the movable body in the optical axis direction. It is preferable that the two sets of drive mechanisms are driven synchronously, and each of the two sets of drive mechanisms includes at least one of the drive members. In this way, the movable body can be supported at two points above and below in the optical axis direction. Therefore, the tilting of the movable body can be suppressed, and the movement and posture of the movable body in the rolling correction can be stabilized.

In the present invention, it is preferable that the flexible printed circuit board is provided to be connected to the drive member, and the flexible printed circuit board is formed with an energization pattern for energizing the drive member. As described above, by using the flexible printed circuit board, the wiring work for the rolling drive mechanism can be facilitated.

According to the present invention, the rolling drive mechanism that rotates the movable body around the optical axis includes a drive member made of a shape memory alloy, and the drive member extends between two locations separated in the circumferential direction and is a movable body. And the fixed body are connected. Therefore, by energizing the drive member, the length of the drive member can be changed to rotate the movable body. Therefore, rolling correction can be performed. Further, such a drive member can be made smaller in shape and has a high degree of freedom in arrangement. Therefore, the rolling drive mechanism can be miniaturized and the degree of freedom in design can be improved.

It is a perspective view of the optical unit with a runout correction function to which this invention is applied. It is a perspective view of the optical unit with a runout correction function excluding a cover. It is a top view when the optical unit main body part is seen from the optical axis direction. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG. It is an exploded perspective view of the main body of an optical unit. It is explanatory drawing of a movable body, a rotation support mechanism, and a gimbal mechanism. It is an exploded perspective view of the rotation support mechanism. It is an exploded perspective view of a rolling drive mechanism and a rotation support mechanism. It is a top view of the rolling drive mechanism and the rotation support mechanism. It is a side view which shows the modification 1 of the rolling drive mechanism schematically. It is a top view which shows the modification 2 of the rolling drive mechanism and its operation schematically. It is a top view which shows the modification 3 and modification 4 of the rolling drive mechanism schematically. It is a top view which shows the modification 5 of the rolling drive mechanism schematically.

Hereinafter, embodiments of an optical unit with a runout correction function to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a perspective view of an optical unit 1 with a runout correction function to which the present invention is applied. FIG. 2 is a perspective view of the optical unit 1 with a runout correction function excluding the cover 2. FIG. 3 is a plan view of the optical unit main body 3 when viewed from the optical axis L direction. In FIG. 3, the first flexible printed circuit board 6, the second flexible printed circuit board 7, and the third flexible printed circuit board 8 drawn out from the optical unit main body 3 are omitted. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 6 is an exploded perspective view of the optical unit main body 3.

As shown in FIGS. 1 and 2, the optical unit 1 with a runout correction function includes a rectangular parallelepiped cover 2 and an optical unit main body 3 housed in the cover 2. The optical unit main body 3 has an image pickup module 5 including a lens 4 and an image pickup element 9 (see FIG. 7). The first flexible printed circuit board 6 and the second flexible printed circuit board 7 are drawn out in parallel from the cover 2. Further, the third flexible printed circuit board 8 is pulled out from the cover 2 in a direction different from the drawing direction of the first flexible printed circuit board 6 and the second flexible printed circuit board 7.

The optical unit 1 with a shake correction function is used, for example, in an optical device such as a mobile phone with a camera or a drive recorder, or an optical device such as an action camera or a wearable camera mounted on a moving body such as a helmet, a bicycle, or a radiocon helicopter. .. In such an optical device, if the optical device shakes during shooting, the captured image is distorted. The optical unit 1 with a shake correction function corrects the tilt of the image pickup module 5 based on the acceleration, the angular velocity, the amount of shake, etc. detected by a detection means such as a gyroscope in order to prevent the captured image from tilting.

In the optical unit 1 with a shake correction function of this embodiment, the optical axis L of the lens 4, the first axis R1 orthogonal to the optical axis L, and the second axis R2 orthogonal to the optical axis L and the first axis R1 are rotated. The image pickup module 5 is rotated to perform runout correction.

In the following description, the three axes orthogonal to each other are defined as the X-axis direction, the Y-axis direction, and the Z-axis direction. Further, one side in the X-axis direction is the −X direction, and the other side is the + X direction. One side in the Y-axis direction is the −Y direction, and the other side is the + Y direction. One side in the Z-axis direction is the −Z direction, and the other side is the + Z direction. The X-axis direction is the longitudinal direction of the cover 2, and the Y-axis direction is the lateral direction of the cover 2. The first flexible printed circuit board 6 and the second flexible printed circuit board 7 are drawn out from the cover 2 in the + X direction. The third flexible printed circuit board 8 is pulled out from the cover 2 in the −Y direction. The Z-axis direction is a direction along the optical axis L (optical axis direction). The −Z direction is the image side of the image pickup module 5, and the + Z direction is the subject side of the image pickup module 5. The first axis R1 and the second axis R2 are tilted 45 degrees with respect to the X axis and the Y axis around the Z axis (around the optical axis L).

The cover 2 includes a plate-shaped image-side cover 10 that covers the optical unit main body 3 from the −Z direction. As shown in FIG. 1, an elastic engaging portion 141 bent in the + Z direction is formed at a corner portion of the image side cover 10. As shown in FIG. 2, a metal case 97 is arranged on the outer peripheral portion of the optical unit main body 3. By locking the elastic engaging portion 141 to the locking portion 143 formed at the corner portion of the case 97, the image side cover 10 is fixed to the optical unit main body portion 3.

Further, as shown in FIG. 1, the cover 2 includes a subject-side cover 11 that covers the image-side cover 10 from the + Z direction. The subject-side cover 11 includes a frame-shaped first cover 12 that covers the optical unit main body 3 from the outer peripheral side, and a box-shaped second cover 13 that is located in the + X direction of the first cover 12. The second cover 13 partially covers the first flexible printed circuit board 6 and the second flexible printed circuit board 7 drawn out from the optical unit main body 3 in the + X direction. The first cover 12 is fixed to the case 97 by welding and is fixed to the second cover 13 by an adhesive. The second cover 13 is provided with a locking portion (not shown) similar to the locking portion 143 of the case 97 on the side surface in the + X direction, and is provided with an elastic engaging portion (not shown) on the image side cover 10. ) Is locked, so that the image side cover 10 is fixed to the second cover 13.

As shown in FIG. 2, the first flexible printed circuit board 6 and the second flexible printed circuit board 7 are fixed to the end portion of the image side cover 10 in the + X direction via the reinforcing plate 19. Further, the third flexible printed circuit board 8 is routed along the outer peripheral surfaces of the optical unit main body 3 in the −X direction and the −Y direction. The third flexible printed circuit board 8 is drawn out from the outer peripheral surface of the optical unit main body 3 in the −Y direction in the −Y direction.

As shown in FIGS. 3 and 6, the optical unit main body 3 includes a movable body 20 including an image pickup module 5 and a rotation support mechanism 21 that rotatably supports the movable body 20 around the optical axis L. Further, the optical unit main body 3 rotatably supports the rotation support mechanism 21 around the first axis R1, and also rotatably supports the gimbal mechanism 22 around the second axis R2, and the gimbal mechanism 22 and the rotation support. It has a fixed body 23 that supports the movable body 20 via a mechanism 21. The movable body 20 is supported by the fixed body 23 in a state of being rotatable around the first axis R1 and the second axis R2 via the rotation support mechanism 21 and the gimbal mechanism 22. The movable body 20 rotates around the X-axis and the Y-axis by combining the rotation around the first axis R1 and the rotation around the second axis R2. As a result, the optical unit 1 with a runout correction function performs pitching correction around the X-axis and yawing correction around the Y-axis.

Further, the optical unit main body 3 includes a runout correction drive mechanism 25 that rotates the movable body 20 around the first axis R1 and the second axis R2. The runout correction drive mechanism 25 includes a first runout correction magnetic drive mechanism 26 that generates a driving force around the X axis with respect to the movable body 20, and a first driving force that generates a driving force around the Y axis with respect to the movable body 20. 2 A magnetic drive mechanism 27 for runout correction is provided. The first runout correction magnetic drive mechanism 26 is arranged in the −Y direction of the image pickup module 5. The second runout correction magnetic drive mechanism 27 is arranged in the −X direction of the image pickup module 5. Further, the optical unit main body 3 includes a rolling drive mechanism 28 that rotates the movable body 20 around the optical axis L to perform rolling correction.

(Movable body)
FIG. 7 is an explanatory view of the movable body 20, the rotation support mechanism 21, and the gimbal mechanism 22. As shown in FIG. 7, the movable body 20 includes an image pickup module 5 and a frame-shaped holder 29 that surrounds the image pickup module 5 from the outer peripheral side. The image pickup module 5 includes a substantially octagonal image pickup module main body 30 when viewed from the Z axis direction, and a cylindrical portion 31 projecting from the center of the image pickup module main body 30 in the + Z direction. The lens 4 which is an optical element is housed in the cylindrical portion 31. The cylindrical portion 31 is coaxial with the optical axis L and extends in the optical axis L direction with a constant outer diameter dimension. The image sensor 9 is housed in the image sensor main body 30. The image sensor 9 is located on the optical axis L of the lens 4 in the −Z direction of the lens 4.

As shown in FIG. 7, the holder 29 includes a first side wall 35 and a second side wall 36 extending parallel to the Y direction, and a third side wall 37 and a fourth side wall 38 extending parallel to the X direction. The first side wall 35 is located in the −X direction of the second side wall 36. The third side wall 37 is located in the −Y direction of the fourth side wall 38. Further, the holder 29 includes a fifth side wall 39 and a sixth side wall 40 located diagonally in the first axis R1 direction, and a seventh side wall 41 and an eighth side wall 42 located diagonally in the second axis R2 direction. .. The fifth side wall 39 is located in the −X direction of the sixth side wall 40. The seventh side wall 41 is located in the −Y direction of the eighth side wall 42.

A first magnet 45 is fixed to the first side wall 35 via a plate-shaped first yoke 44 made of a magnetic material. The first magnet 45 is divided into two in the Z-axis direction. A second magnet 47 is fixed to the third side wall 37 via a plate-shaped second yoke 46 made of a magnetic material. The first magnet 45 and the second magnet 47 are arranged so that the same poles are directed in the Z-axis direction. The second magnet 47 is divided into two in the Z-axis direction. The first magnet 45 and the second magnet 47 are runout correction magnets of the runout correction drive mechanism 25 that rotates the movable body 20 around the first axis R1 and the second axis R2.

(Rotation support mechanism)
FIG. 8 is an exploded perspective view of the rotation support mechanism 21 when viewed from the + Z direction. As shown in FIGS. 7 and 8, the rotation support mechanism 21 includes a plate roll 51 fixed to the movable body 20, a plate holder 52 having an opposing portion 56 facing the plate roll 51 in the Z-axis direction, and a plate roll. It includes a sliding member 53 that slides in contact with the plate holder 52 and the plate holder 52. Further, the rotation support mechanism 21 includes a first pressurization mechanism 54 and a second pressurization mechanism 55 that urge the plate roll 51 in a direction approaching the plate holder 52.

The plate roll 51 is made of metal and is made of a non-magnetic material. The plate roll 51 includes a plate roll annular portion 57 that surrounds the optical axis L, and a pair of plate roll extending portions 58 that project from the plate roll annular portion 57 on both sides in the second axis R2 direction and extend in the −Z direction. .. The plate roll annular portion 57 includes a plate roll annular plate 59 and a plate roll annular wall 60 that bends and extends in the + Z direction from the inner peripheral side edge of the plate roll annular plate 59. The plate roll annular wall 60 has a cylindrical shape. Pressurizing magnets 62 are fixed to the plate roll annular plate 59 at a plurality of locations separated in the circumferential direction.

Each of the pair of plate roll extending portions 58 includes a fixing portion 63 fixed to the movable body 20 at an end portion in the −Z direction. The fixing portion 63 includes a plurality of wedge-shaped protrusions 63a whose width in the circumferential direction widens toward the + Z direction at both end edges in the circumferential direction. Further, the fixing portion 63 includes a rectangular protrusion 63b on the outer surface in the second axis R2 direction. The amount of protrusion of the rectangular protrusion 63b in the second axis R2 direction increases in the + Z direction.

The plate holder 52 is made of a magnetic material. The plate holder 52 includes a plate holder annular portion 65 and a pair of plate holder extension portions 66 projecting from the plate holder annular portion 65 toward both sides in the first axis R1 direction and extending in the −Z direction. The plate holder annular portion 65 is an opposing portion 56 of the plate holder 52 that faces the plate roll annular portion 57 in the Z-axis direction. The plate holder annular portion 65 includes a plate holder annular plate 67 located in the + Z direction of the plate roll annular portion 57, and a plurality of plate holder arc walls 68 bent in the −Z direction from the outer peripheral side edge of the plate holder annular plate 67. , Equipped with.

The pair of plate holder extension portions 66 are the plate holder first extension portion 66a extending from the plate holder annular portion 65 on both sides in the direction of the first axis R1, and the outer peripheral end of the plate holder first extension portion 66a, respectively. The outer circumference of the movable body 20 from the end of the plate holder second extending portion 66b and the plate holder second extending portion 66b in the −Z direction, which are inclined in the −Z direction toward the direction away from the plate holder annular portion 65. A plate holder third extension portion 66c extending on the side in the −Z direction is provided. The plate holder first extending portion 66a projects from the end of the plate holder arc wall 68 in the −Z direction in the direction of the first axis R1.

As shown in FIG. 4, the plate holder third extension portion 66c of one plate holder extension portion 66 faces the fifth side wall 39 of the movable body 20 with a slight gap in the direction of the first axis R1. The plate holder third extension portion 66c of the other plate holder extension portion 66 faces the sixth side wall 40 of the movable body 20 with a slight gap in the direction of the first axis R1. Further, each plate holder third extending portion 66c includes a first axis side concave curved surface 69 that is recessed in the radial direction (side of the movable body 20) on the first axis R1 line.

Here, as shown in FIGS. 4 and 5, the plate roll 51 and the plate holder 52 have a plate roll annular wall 60 inserted inside the plate holder annular portion 65 from the −Z direction in the Z-axis direction. Can be stacked. The end portion of the plate roll annular wall 60 in the + Z direction protrudes from the plate holder annular portion 65 in the + Z direction. As shown in FIGS. 4 and 7, an annular plate member 77 is fixed to the + Z direction end of the plate roll annular wall 60. When viewed from the optical axis L direction, the outer peripheral side portion of the plate member 77 and the inner peripheral end portion of the plate holder annular portion 65 overlap. A slight gap is formed in the Z-axis direction between the plate member 77 and the plate holder annular portion 65.

As shown in FIG. 8, the sliding member 53 is formed with through holes 75 at a plurality of locations. In a state where the sliding member 53 is arranged between the plate holder annular portion 65 and the plate roll annular portion 57, the pressurizing magnet 62 fixed to the plate roll annular portion 57 is inserted into the through hole 75. The pressurizing magnet 62 attracts the plate holder 52 made of a magnetic material in a direction approaching the plate holder 52. That is, the pressurization magnet 62 constitutes a first pressurization mechanism 54 that urges the plate roll 51 in a direction approaching the plate holder 52.

As shown in FIGS. 5 and 7, each of both end portions of the movable body 20 in the second axis R2 direction is provided with plate roll fixing holes 79 for receiving the fixing portions 63 of the pair of plate roll extending portions 58. The plate roll fixing hole 79 is provided in the holder 29. The rotation support mechanism 21 is fixed to the movable body 20 by pressing the fixing portion 63 of each plate roll extending portion 58 of the plate roll 51 into each plate roll fixing hole 79. When the fixing portion 63 is inserted into the plate roll fixing hole 79, the cylindrical portion 31 of the imaging module 5 is inserted into the plate roll annular wall 60. As a result, the plate roll 51 is fixed to the movable body 20 in a state where the plate roll annular wall 60 is positioned coaxially with the optical axis L. Further, when the fixing portion 63 of each plate roll extending portion 58 is press-fitted into each plate roll fixing hole 79, the protrusion 63a and the protrusion 63b of the fixing portion 63 are plastically deformed and crushed. As a result, the plate roll 51 and the movable body 20 are fixed. Therefore, the movable body 20 can rotate around the optical axis L integrally with the plate roll 51.

When the plate roll 51 and the movable body 20 are fixed, the plate holder annular portion 65 of the plate holder 52 made of a magnetic material sandwiches the plate roll annular portion 57 in the Z-axis direction and sandwiches the first magnet 45 and the movable body 20. It is located on the opposite side of the second magnet 47. This will
The first magnet 45 and the second magnet 47 attract the plate holder annular portion 65 in a direction approaching the plate roll annular portion 57. Therefore, the first magnet 45 and the second magnet 47 form a second pressurization mechanism 55 that urges the plate roll 51 in a direction approaching the plate holder 52.

(Gimbal mechanism)
As shown in FIG. 3, the gimbal mechanism 22 includes a gimbal frame 80 and a first connection mechanism 81 that rotatably connects the gimbal frame 80 and the plate holder 52 around the first axis R1. Further, the gimbal mechanism 22 includes a second connection mechanism 82 that rotatably connects the gimbal frame 80 and the fixed body 23 around the second axis R2. As shown in FIGS. 4 and 6, the first connection mechanism 81 is provided on the first shaft side shaft 83 and the plate holder 52, which project from the gimbal frame 80 on the first shaft R1 toward the plate holder 52. A first shaft side concave curved surface 69 with which the tip of the first shaft side shaft 83 rotatably contacts is provided. As shown in FIGS. 5 and 6, the second connection mechanism 82 is provided on the gimbal frame 80 and the second shaft side shaft 84 that projects from the fixed body 23 on the second shaft R2 toward the gimbal frame 80. A second shaft side concave curved surface 95 with which the tip of the second shaft side shaft 84 comes into contact is provided.

(Gimbal frame)
The gimbal frame 80 is made of a metal leaf spring. As shown in FIGS. 6 and 7, the gimbal frame 80 protrudes from the gimbal frame main body 85 located in the + Z direction of the plate holder 52 and the gimbal frame main body 85 toward both sides in the first axis R1 direction. A pair of gimbal frame extending portions 86 on the first axis side extending in the −Z direction, and a pair of gimbals on the second axis side extending in the −Z direction protruding from the gimbal frame main body 85 toward both sides in the R2 direction of the second axis. A frame extension portion 87 is provided. The gimbal frame main body 85 has a substantially rectangular central plate portion 85a extending in the first axis R1 direction and one side (-Y direction side) of the central plate portion 85a in the second axis R2 direction toward the outer peripheral side. A first inclined plate portion 85b inclined in the + Z direction and a second inclined plate portion 85c inclined in the + Z direction from the other side (+ Y direction side) of the central plate portion 85a in the second axis R2 direction toward the outer peripheral side. , Equipped with. Further, the gimbal frame main body 85 is provided with an opening 90 penetrating in the Z-axis direction at the center. The cylindrical portion 31 of the imaging module 5 is inserted into the opening 90.

As shown in FIGS. 4, 6 and 7, the pair of first shaft side gimbal frame extension portions 86 are located on the outer peripheral side of the plate holder 52. As shown in FIG. 7, each of the pair of first axis side gimbal frame extension portions 86 extends in a direction in which the first axis R1 direction is separated from the gimbal frame main body portion 85. 1 The first axis R1 direction is inclined in the −Z direction from the tip of the first extension portion 86a and the first extension portion 86a of the gimbal frame extension portion on the first axis side in the direction away from the gimbal frame main body portion 85. The outer peripheral side of the plate holder 52 extends in the -Z direction from the -Z direction ends of the 1-axis side gimbal frame extension portion 2nd extension portion 86b and the 1st axis side gimbal frame extension portion 2nd extension portion 86b. A gimbal frame extension portion 86c on the first axis side is provided with a third extension portion 86c.

As shown in FIGS. 4 and 7, the first extension portion 86a of the first axis side gimbal frame extension portion protrudes from the central plate portion 85a in the direction of the first axis R1. The third extension portion 86c of the gimbal frame extension portion on the first axis side includes a gimbal frame extension portion through hole 92 penetrating in the direction of the first axis R1. Further, the third extension portion 86c of the first shaft side gimbal frame extension portion is a cylinder for supporting the first shaft side shaft that projects from the opening edge of the gimbal frame extension portion through hole 92 toward the outer periphery in the first axis R1 direction. A unit 93 is provided. Further, the third extension portion 86c of the first axis side gimbal frame extension portion includes a pair of gimbal frame extension portion protrusions 94 protruding inward from both end edges in the circumferential direction. The pair of gimbal frame extension portion protrusions 94 are provided in the first axis side gimbal frame extension portion third extension portion 86c on the + Z direction side of the gimbal frame extension portion through hole 92. Further, on the outer surface of the first axis side gimbal frame extension portion 86 opposite to the plate holder extension portion 66, the first axis side gimbal from the first axis side gimbal frame extension portion second extension portion 86b A rib 91 leading to the third extension portion 86c of the frame extension portion is provided. The rib 91 extends via a bent portion between the second extension portion 86b of the first shaft side gimbal frame extension portion and the third extension portion 86c of the first shaft side gimbal frame extension portion.

Here, the first shaft side shaft 83 has a cylindrical shape, is inserted into the gimbal frame extension portion through hole 92 and the first shaft side shaft support cylinder portion 93, and is held by the gimbal frame 80. As a result, the first shaft side shaft 83 extends on the first shaft R1 in the direction of the first shaft R1. The end portion on the inner peripheral side of the shaft 83 on the first shaft side projects from the third extension portion 86c of the gimbal frame extension portion on the first shaft side toward the plate holder extension portion 66. The end on the inner peripheral side of the shaft 83 on the first shaft side includes a hemispherical surface.

Next, as shown in FIG. 7, each of the pair of second axis side gimbal frame extension portions 87 extends the second axis side gimbal frame extension portion in a direction in which the second axis R2 direction is separated from the gimbal frame main body portion 85. From the tips of the first extension portion 87a of the installation portion and the first extension portion 87a of the gimbal frame extension portion on the second axis side, the first axis R1 direction is separated from the gimbal frame main body portion 85 in the −Z direction. The outer peripheral side of the movable body 20 is −Z from the end in the −Z direction of the inclined second axis side gimbal frame extension portion second extension portion 87b and the second axis side gimbal frame extension portion second extension portion 87b. A second axis side gimbal frame extension portion extending in the direction and a third extension portion 87c are provided. The first extension portion 87a of the second axis side gimbal frame extension portion 87 of the one second axis side gimbal frame extension portion 87 located in the −Y direction is the first from the outer peripheral edge of the first inclined plate portion 85b. It projects in the 2-axis R2 direction. The first extension portion 87a of the second axis side gimbal frame extension portion 87 of the one second axis side gimbal frame extension portion 87 located in the + Y direction is second from the outer peripheral edge of the second inclined plate portion 85c. It projects in the axis R2 direction. Each second axis side gimbal frame extension portion third extension portion 87c includes a second axis side concave curved surface 95 that is recessed on the second axis R2 toward the inner circumference side.

(1st connection mechanism)
As shown in FIG. 6, the pair of plate holder extension portions 66 are located between the pair of first axis side gimbal frame extension portions 86 and the movable body 20. The third extension portion 86c of the first shaft side gimbal frame extension portion holding the first shaft side shaft 83 and the third extension portion 66c of the plate holder provided with the first shaft side concave curved surface 69 are first. Opposing on axis R1. The first connection mechanism 81 is configured such that the tip of the first shaft side shaft 83 protruding inward from the first shaft side gimbal frame extending portion 86 comes into contact with the first shaft side concave curved surface 69. In this embodiment, the first shaft side shaft 83 and the first shaft side concave curved surface 69 are in point contact with each other. As a result, the rotation support mechanism 21 is supported by the gimbal frame 80 in a state of being rotatable around the first axis R1 via the first connection mechanism 81. Therefore, the movable body 20 supported by the rotation support mechanism 21 is rotatably supported around the first axis R1 by the gimbal mechanism 22. In a state where the first shaft side shaft 83 is in contact with the first shaft side concave curved surface 69, each plate holder extension portion 66 is a pair of gimbal frame extension portions provided on each first axis side gimbal frame extension portion 86. It is located inside the protruding portion 94.

When the movable body 20 and the rotation support mechanism 21 are supported by the gimbal mechanism 22, the gimbal frame main body 85, the plate roll annular portion 57, and the plate holder annular portion 65 are cylindrical in the + Z direction of the image pickup module main body 30. It is located on the outer peripheral side of the portion 31. The plate roll annular portion 57 is located between the gimbal frame main body 85 and the imaging module main body 30 in the Z-axis direction. Further, the plate holder annular portion 65 is located between the gimbal frame main body 85 and the imaging module main body 30 in the Z-axis direction in the + Z direction of the plate roll annular portion 57. Here, the plate roll annular portion 57 and the plate holder annular portion 65 are located in the + Z direction with respect to the first axis R1 and the second axis R2. Further, the gimbal frame main body portion 85, the plate roll annular portion 57, and the plate holder annular portion 65 are located in the + Z direction with respect to the image sensor 9.

(Fixed body)
As shown in FIGS. 3 and 6, the fixed body 23 has a frame-shaped case 97 that surrounds the movable body 20 and the rotation support mechanism 21 from the outer peripheral side. The case 97 is made of metal and is made of a non-magnetic material. The shape of the case 97 when viewed from the Z-axis direction is an octagon. As shown in FIG. 6, the case 97 includes an octagonal frame-shaped plate portion 98 and a frame portion 99 located on the radial outer side of the holder 29. The frame portion 99 is bent from the outer peripheral edge of the frame-shaped plate portion 98 and extends in the −Z direction.

The frame portion 99 includes a first side plate 101 and a second side plate 102 extending parallel to the Y direction, and a third side plate 103 and a fourth side plate 104 extending parallel to the X direction. The first side plate 101 is located in the −X direction of the second side plate 102. The third side plate 103 is located in the −Y direction of the fourth side plate 104. Further, the frame portion 99 connects the fifth side plate 105 that connects the first side plate 101 and the third side plate 103, and the second side plate 102 and the fourth side plate 104 diagonally in the direction of the first axis R1. A sixth side plate 106 is provided. The fifth side plate 105 and the sixth side plate 106 extend in parallel. Further, the frame portion 99 connects the seventh side plate 107 that connects the first side plate 101 and the fourth side plate 104, and the second side plate 102 and the third side plate 103 diagonally in the second axis R2 direction. The eighth side plate 108 is provided. The seventh side plate 107 and the eighth side plate 108 extend in parallel.

As shown in FIG. 6, the case 97 includes a first coil holding opening 109 in the first side plate 101. The first coil 110 is inserted into the opening 109 for holding the first coil. The first coil 110 has an elliptical shape that is long in the circumferential direction, and the central hole is directed in the radial direction. Further, the frame portion 99 includes a second coil holding opening 111 in the third side plate 103. The second coil 112 is inserted into the opening 111 for holding the second coil. The second coil 112 has an elliptical shape that is long in the circumferential direction, and the central hole is directed in the radial direction. As shown in FIG. 2, the third flexible printed circuit board 8 is routed along the outer peripheral surfaces of the first side plate 101 and the third side plate 103. The first coil 110 and the second coil 112 are electrically connected to the third flexible printed circuit board 8.

Further, the case 97 is provided with a rectangular notch portion 115 extending in the + Z direction from the end in the −Z direction of the second side plate 102. The first flexible printed circuit board 6 and the second flexible printed circuit board 7 connected to the image pickup module 5 are drawn out from the optical unit main body 3 in the + X direction via the notch 115.

As shown in FIGS. 5 and 6, the seventh side plate 107 and the eighth side plate 108 of the case 97 are each provided with through holes 117 penetrating in the second axis R2 direction. Further, the 7th side plate 107 and the 8th side plate 108 project in the second axis R2 direction at the opening edge of the through hole 117 on the inner side surface (the surface on the side where the second axis side gimbal frame extending portion 87 is located). A cylinder portion 118 is provided. The second shaft side shaft 84 penetrates through the through holes 117 of the seventh side plate 107 and the eighth side plate 108. The second shaft side shaft 84 has a cylindrical shape, is inserted into the through hole 117, and is supported by the tubular portion 118.

The second shaft side shaft 84 is made of metal and is fixed to each of the seventh side plate 107 and the eighth side plate 108 by welding. The second shaft side shaft 84 fixed to each of the seventh side plate 107 and the eighth side plate 108 extends on the second shaft R2 in the direction of the second shaft R2. The end portion of the second shaft side shaft 84 on the inner peripheral side projects from the frame portion 99 toward the inner peripheral side. The end on the inner peripheral side of the shaft 83 on the first shaft side includes a hemispherical surface.

(Second connection mechanism)
As shown in FIG. 5, in the second connection mechanism 82, the movable body 20, the rotation support mechanism 21, and the gimbal frame 80 are arranged inside the case 97, and the tip portion of the second shaft side shaft 84 is the second shaft side gimbal. The frame extension portion is formed by inserting the third extension portion 87c into the concave curved surface 95 on the second axis side and bringing them into contact with each other. By connecting the fixed body 23 and the gimbal frame 80 by the second connecting mechanism 82, the gimbal frame 80, the rotation support mechanism 21 and the movable body 20 can rotate around the second axis R2, and the fixed body 23 Supported by.

Here, since the gimbal frame 80 is a leaf spring, the second axis side gimbal frame extension portion 87 can be elastically deformed in the second axis R2 direction. Therefore, when the second shaft side shaft 84 and the second shaft side concave curved surface 95 of the second shaft side gimbal frame extension portion 87 are brought into contact with each other, the second shaft side gimbal frame extension portion 87 is bent inward. It is in a state of being. As a result, the second shaft side gimbal frame extension portion 87 elastically contacts the second shaft side shaft 84 from the inner peripheral side due to the elastic return force toward the outer peripheral side. Therefore, it is possible to prevent or suppress the disconnection between the second shaft side gimbal frame extending portion 87 and the frame portion 99.

(Drive mechanism for runout correction)
When the movable body 20 supported by the gimbal mechanism 22 is arranged on the inner peripheral side of the case 97, as shown in FIG. 3, the first magnet 45 fixed to the first side wall 35 of the movable body 20 and the case 97 The first coil 110 held in the above space faces the first coil 110 with a gap in the X direction. The first magnet 45 and the first coil 110 form a magnetic drive mechanism 27 for second runout correction. Therefore, the movable body 20 rotates about the Y axis by supplying power to the first coil 110. Further, the second magnet 47 fixed to the third side wall 37 of the movable body 20 and the second coil 112 face each other with a gap in the Y direction. The second magnet 47 and the second coil 112 form a magnetic drive mechanism 26 for first runout correction. Therefore, the movable body 20 rotates about the X-axis by supplying power to the second coil 112. The runout correction drive mechanism 25 rotates the movable body 20 around the X axis by the first runout correction magnetic drive mechanism 26 and the rotation of the movable body 20 around the Y axis by the first runout correction magnetic drive mechanism 27. Synthesized, the movable body 20 is swung around the first axis R1 and around the second axis R2.

As shown in FIGS. 3 and 6, the first magnetic plate 123 is arranged on the side of the first coil 110 opposite to the movable body 20. That is, the first magnetic plate 123 is arranged on the side opposite to the movable body 20 with respect to the first coil 110 in the radial direction of the optical axis L. The first magnetic plate 123 is a rectangle long in the Z-axis direction, and is arranged at a position overlapping the center of the first coil 110 in the Z-axis direction when viewed from the radial direction. The first magnetic plate 123 faces the first magnet 45 of the movable body 20 via the first coil 110, and provides a magnetic spring for returning the movable body 20 to a reference rotation position in the rotation direction around the Y axis. Configure.

(Rolling drive mechanism)
FIG. 9 is an exploded perspective view of the rolling drive mechanism 28 and the rotation support mechanism 21. As shown in FIGS. 7 and 9, the rolling drive mechanism 28 includes a drive member 200 made of a shape memory alloy. The drive member 200 connects the movable body 20 and the fixed body 23. As shown in FIG. 7, the drive member 200 extends linearly in the X-axis direction or the Y-axis direction, and connects two points separated in the circumferential direction. The rolling drive mechanism 28 controls the temperature of the drive member 200 by controlling the presence / absence of energization of the drive member 200 and the amount of energization, and changes the form (length) of the drive member 200. As a result, the movable body 20 is rotated around the Z axis (around the optical axis L) with respect to the fixed body 23 to perform rolling correction.

The shape memory alloy constituting the drive member 200 is, for example, a Ni—Ti alloy. The shape memory alloy returns to its memory shape when the temperature rises to a high temperature phase (generally an austenite phase). Further, the shape memory alloy can be deformed from the memory shape by an external force when the temperature drops to a low temperature phase (generally a martensite phase). The drive member 200 is deformed into a shape longer than the memory shape in the low temperature phase, and is attached in a state of connecting the movable body 20 and the fixed body 23.

As shown in FIG. 7, the drive member 200 is attached to the rotation support mechanism 21. In the rotation support mechanism 21, the plate roll 51 fixed to the movable body 20 and the plate holder 52 connected to the fixed body 23 via the gimbal mechanism 22 can rotate relative to each other about the optical axis L. .. The two plate roll extension portions 58 provided on the plate roll 51 and the two plate holder extension portions 66 provided on the plate holder 52 are alternately arranged in the circumferential direction. The drive member 200 is arranged on the outer peripheral side of the plate holder annular portion 65 and the plate roll annular portion 57, and the drive member 200 is located between the plate roll extension portion 58 and the plate holder extension portion 66 that are adjacent to each other in the circumferential direction. Is bridged. Therefore, by changing the length of the drive member 200, the plate roll 51 rotates relative to the plate holder 52, and the movable body 20 rotates around the optical axis L.

The rolling drive mechanism 28 includes a plurality of drive members 200. The drive member 200 includes a drive member 201 extending in the Y-axis direction on the −X direction side of the plate holder annular portion 65 and the plate roll annular portion 57, and a Y axis on the + X direction side of the plate holder annular portion 65 and the plate roll annular portion 57. The drive member 202 extending in the direction, the drive member 203 extending in the X-axis direction on the + Y direction side of the plate holder annular portion 65 and the plate roll annular portion 57, and the −Y direction side of the plate holder annular portion 65 and the plate roll annular portion 57. Includes a drive member 204 extending in the X-axis direction at. The drive members 201, 202, 203, and 204 have substantially the same position in the optical axis L direction, and extend in a direction orthogonal to the optical axis L. Further, the directions in which the driving members 201, 202, 203, and 204 extend are tangential to the virtual circle centered on the optical axis L, and are orthogonal to the radial direction. As shown in FIGS. 4 and 5, the drive member 200 (drive members 201, 202, 203, 204) is located on the + Z direction side of the holder 29, and the image pickup module main body 30 projecting from the holder 29 in the + Z direction. It surrounds the outer peripheral side.

As shown in FIG. 9, the drive member 200 is a member obtained by folding back a wire 210 made of a shape memory alloy. The wire 210 is, for example, a wire rod having a circular cross section. The drive member 200 includes a first portion 211 connected to the movable body 20 at one end in the longitudinal direction. The first portion 211 is a bent portion in which the wire 210 is folded back in a substantially U shape. Further, the drive member 200 includes a straight portion 213 composed of two wires 210 which are bent so as to form an obtuse angle from the first portion 211 and extend substantially in parallel, and the side of the straight portion 213 opposite to the first portion 211. A second portion 212 connected to the fixed body 23 is provided at the end of the. When the drive member 200 is attached to the rotation support mechanism 21, the first portion 211 and the second portion 212 are separated from each other in the circumferential direction.

The second portion 212 includes two wire end portions 214 and a locking component 215 fixed to the wire end portion 214. The plate holder extending portion 66 is provided with a wire fixing portion 230 for fixing the second portion 212. The wire fixing portion 230 is, for example, a locking portion such as a recess or a notch that locks the locking component 215. It is also possible to directly fix the two wire end portions 214 to the plate holder extension portion 66 by welding or the like without using the locking component 215. In this case, the welded portion of the plate holder extension portion 66 is the wire fixing portion 230.

As shown in FIGS. 7 and 9, a wire locking portion 220 for locking the substantially U-shaped first portion 211 is formed in the plate roll extending portion 58. The wire locking portion 220 is a convex portion that protrudes outward in the radial direction. The first portion 211 of the two drive members 200 adjacent to each other in the circumferential direction is locked to the wire locking portion 220 from the opposite side in the circumferential direction. In this embodiment, the wire locking portion 220 in which the first portion 211 of the driving members 201 and 203 is provided on one of the plate roll extending portions 58.
The first portion 211 of the driving members 202 and 204 is locked to the wire locking portion 220 provided on the other plate roll extending portion 58.

The rolling drive mechanism 28 energizes the drive member 200 via a flexible printed circuit board (not shown). For example, one of the two wire end portions 214 constituting the second portion 212 fixed to the plate holder extension portion 66 is connected to the + electrode provided on the flexible printed circuit board, and the other one is connected. The wire end 214 of the above is connected to the −electrode provided on the flexible printed circuit board. The flexible printed circuit board is formed with an energization pattern for energizing the wire 210 from the + electrode and the-electrode connected to the wire end 214.

(Operation of rolling correction mechanism)
FIG. 10 is a plan view of the rolling drive mechanism 28 and the rotation support mechanism 21. The state of FIG. 10 is a state when the movable body 20 is at the origin position of the rolling correction, and the four drive members 200 have the same length when viewed from the optical axis L direction. In FIG. 10, the first rotation direction CW and the second rotation direction CCW are the rotation directions of the movable body 20. The movable body 20 rotates integrally with the plate roll 51 of the rotation support mechanism 21. The rolling drive mechanism 28 energizes the pair of drive members 201 and 202 (hereinafter, referred to as the first drive member) arranged on opposite sides of the four drive members 200 with the optical axis L interposed therebetween. , The pair of drive members 203 and 204 (hereinafter referred to as the second drive member) arranged on opposite sides of the optical axis L at a position different from that of the first drive member are energized in synchronization with each other.

The rolling drive mechanism 28 changes the drive member 200 between the first shape and the second shape. The second shape is a memory shape of the drive member 200. The first shape is a shape deformed from the memory shape (second shape) by an external force, and the length seen from the optical axis L direction is longer than the memory shape. The dimensional difference between the first shape and the second shape (memory shape) when viewed from the optical axis L direction is determined according to the correction angle range of the rolling correction. When the rotational position of the movable body 20 around the optical axis L is the origin position of the rolling correction shown in FIGS. 3 and 10, the drive member 200 has a shape in the process of returning from the first shape to the second shape (memory shape). (Hereinafter referred to as the standard shape). In the reference shape, the length seen from the optical axis L direction is intermediate between the length seen from the optical axis L direction of the first shape and the length seen from the optical axis L direction of the second shape (memory shape). That's right.

As shown in FIG. 10, when the movable body 20 is at the origin position of the rolling correction, the driving members 201, 202, 203, and 203 all have the reference shape. When the movable body 20 is rotated from the origin position to the first rotation direction CW, the first drive member (drive members 201, 202) is energized to return the first drive member (drive members 201, 202) to the memory shape. .. As a result, the first drive members (drive members 201, 202) shrink, so that the plate roll extension portions 58 and the plate holder extension portions 66 connected to both ends of the drive member 201 come closer to each other, and both ends of the drive member 202. The plate roll extension portion 58 and the plate holder extension portion 66 connected to the plate holder extension portion 66 come close to each other. Therefore, the plate roll 51 rotates with respect to the plate holder 52 in the first rotation direction CW, and the movable body 20 rotates in the first rotation direction CW. Further, at this time, a pulling force acts on the second driving member (driving member 203, 204) that is not energized, and the second driving member (driving member 203, 204) is stretched. When the first drive member (drive members 201, 202) shrinks to the memory shape (second shape), the second drive member (drive members 203, 204) is stretched to the first shape.

When the movable body 20 is rotated in the second rotation direction CCW, the second drive member (drive members 203, 204) is energized to restore the second drive member (drive members 203, 204) to the memory shape. As a result, the second drive members (drive members 203 and 204) shrink, so that the plate roll extension portion 58 and the plate holder extension portion 66 connected to the drive member 203 come closer to each other.
The plate roll extension 58 and the plate holder extension 66 connected to the drive member 204 come close to each other. Therefore, the plate roll 51 rotates with respect to the plate holder 52 in the second rotation direction CCW, and the movable body 20 rotates in the second rotation direction CCW. Further, at this time, a pulling force acts on the first driving member (driving member 203, 204) that is not energized, and the first driving member (driving member 203, 204) is stretched. When the second drive member (drive members 203, 204) shrinks to the memory shape (second shape), the first drive member (drive members 201, 202) is stretched to the first shape.

As described above, the rolling drive mechanism 28 controls the energization state of the first drive member (drive members 201, 202) and the second drive member (drive members 203, 204), thereby controlling the optical axis of the movable body 20. Runout correction around L can be performed. In this embodiment, the first drive member (drive members 201, 202) and the second drive member (drive members 203, 204) each include two drive members 200, but one drive member may be used. It may be three or more.

(Main action and effect of this form)
As described above, the optical unit 1 with the shake correction function of the present embodiment rotatably supports the movable body 20 including the lens 4 which is an optical element and the movable body 20 about the optical axis L of the lens 4. The mechanism 21 and the rotary support mechanism 21 are rotatably supported around the first axis R1 intersecting the optical axis L, and rotatably supported around the second axis R2 intersecting the optical axis L and the first axis R1. The gimbal mechanism 22, the fixed body 23 that supports the movable body 20 via the gimbal mechanism 22 and the rotation support mechanism 21, the rolling drive mechanism 28 that rotates the movable body 20 around the optical axis L, and the movable body 20 are the first. It has a runout correction drive mechanism 25 that swings around the axis R1 and around the second axis R2. The rolling drive mechanism 28 includes a drive member 200 made of a shape memory alloy. The drive member 200 includes a first portion 211 connected to the movable body 20 and a second portion 212 connected to the fixed body 23, and the first portion 211 and the second portion 212 are in the circumferential direction around the optical axis L. Separated from. Since the drive member 200 returns to the memory shape when it reaches a predetermined temperature by energization, the length of the drive member 200 when viewed from the optical axis L direction is changed by controlling the energization state of the drive member 200. The movable body 20 can be rotated around the optical axis L.

In this embodiment, the rolling drive mechanism 28 that rotates the movable body 20 around the optical axis L includes a drive member 200 made of a shape memory alloy, and the movable body 20 and the fixed body 23 are connected by the drive member 200. There is. Therefore, by energizing the drive member 200, the shape of the drive member 200 can be changed, the movable body 20 can be rotated, and rolling correction can be performed. Further, such a drive member 200 can be made smaller than the magnetic drive mechanism and has a high degree of freedom in arrangement. Therefore, the rolling drive mechanism 28 can be miniaturized and the degree of freedom in design can be improved.

In this embodiment, the rolling drive mechanism 28 includes two sets of drive members, a first drive member (drive members 201 and 202) and a second drive member (drive members 203 and 204), and controls the two sets of drive members. The movable body 20 is rotated in the first rotation direction CW and the second rotation direction CCW. That is, by energizing the first drive member (drive members 201, 202) and not energizing the second drive member (drive members 203, 204), the first drive member (drive members 201, 202) has a memory shape. The movable body 20 is rotated in the first rotation direction CW, the second drive member (drive members 203, 204) is deformed from the memory shape, the second drive member is energized, and the first drive member is energized. By not energizing (driving members 201, 202), the first driving member (driving members 201, 202) is returned to the memory shape, and the movable body 20 is moved to the second rotation direction CCW opposite to the first rotation direction CW. The first driving member (driving members 201, 202) can be deformed from the memory shape. Therefore, the movable body 20 can be rotated in both the first rotation direction CW and the second rotation direction CCW only by controlling the energization of the drive member 200 without using the urging member.

In the present embodiment, the drive member 200 is a wire 210 made of a shape memory alloy, and one of the first portion 211 and the second portion 212 is a bent portion obtained by folding back the wire 210. By using the wire 210, the drive member 200 can be made smaller and lighter, and the arrangement space can be reduced. Further, the wire 210 provided with the bent portion can be locked to the hook or the convex portion. Therefore, the mounting structure of the drive member 200 can be simplified and the mounting work is easy.

In this embodiment, the rolling drive mechanism 28 is attached to the rotation support mechanism 21. That is, the rotation support mechanism 21 slides in contact with the plate roll 51 fixed to the movable body 20, the plate holder 52 facing the plate roll 51 in the optical axis L direction, and the plate roll 51 and the plate holder 52. Alternatively, it includes a sliding component 53 that rolls. The plate holder 52 is connected to the fixed body 23 via the gimbal frame 80, and the plate roll 51 is connected to the plate roll annular portion 57 that overlaps the movable body 20 when viewed from the optical axis L direction, and the plate roll annular portion 57. A pair of plate roll extending portions 58 projecting on both sides in the second axis R2 direction are provided. Further, the plate holder 52 includes a plate holder annular portion 65 facing the plate roll annular portion 57, and a pair of plate holder extending portions 66 projecting from the plate holder annular portion 65 on both sides in the direction of the first axis R1. The plate roll extending portion 58 includes a wire locking portion 220 for locking the bent portion of the wire 210. The plate holder extension portion 66 includes a wire fixing portion 230 to which the end portion of the wire 210 is fixed. With the above configuration, the wire 210 can be hung between the plate roll extension portion 58 and the plate holder extension portion 66 adjacent to each other in the circumferential direction, and the rolling drive mechanism 28 is attached to the rotation support mechanism 21. Can be done. The arrangement of the wire locking portion 220 and the wire fixing portion 230 can be interchanged. That is, the wire locking portion 220 may be provided on the plate holder extending portion 66, and the wire fixing portion 230 may be provided on the plate roll extending portion 58.

By attaching the rolling drive mechanism 28 to the rotation support mechanism 21 in this way, the mechanisms for rolling correction can be gathered in one place. Further, in such a configuration, the rolling drive mechanism 28 does not greatly protrude to the outer peripheral side of the rotation support mechanism 21, and the rolling drive mechanism 28 is arranged within the range of the rotation support mechanism 21 also in the optical axis L direction. .. Therefore, the arrangement space of the rolling drive mechanism is small, and there is little possibility of interference with other mechanisms. Therefore, it is advantageous for miniaturization of the optical unit 1 with a runout correction function.

In this embodiment, a flexible printed circuit board (not shown) connected to the drive member 200 is provided, and the flexible printed circuit board is formed with an energization pattern for energizing the drive member 200. As described above, by using the flexible printed circuit board, the wiring work for the rolling drive mechanism 28 can be facilitated.

(Modification example 1)
In the above embodiment, the rolling drive mechanism 28 is attached to the rotation support mechanism 21, but in the modified examples 1-5 described below, the portion to which the rolling drive mechanism 28 is attached is not limited to the rotation support mechanism 21. .. FIG. 11 is a side view schematically showing a modification 1 of the rolling drive mechanism 28. In the above embodiment, the drive member 200 of the rolling drive mechanism 28 is arranged at the end of the movable body 20 on one side (subject side) of the optical axis L direction, but the drive member 200 is arranged in the optical axis L direction. Is not limited to the above-mentioned arrangement. As shown in FIG. 11, the rolling drive mechanism 28 of the first modification includes a first drive mechanism 28A and a second drive mechanism 28B. The first drive mechanism 28A is arranged at one end of the movable body 20 in the optical axis L direction. Further, the second drive mechanism 28B is arranged at the other end of the movable body 20 in the optical axis L direction.

The first drive mechanism 28A and the second drive mechanism 28B each include at least one drive member 200. The configuration of each drive member 200 is the same as the above-described embodiment. The movable body 20 is provided with a wire locking portion 220 for locking the drive member 200 at one end in the L direction of the optical axis and at the other end, respectively. Further, the fixed body 23 is provided with a wire fixing portion 230 for fixing the drive member 200 at one end portion in the optical axis L direction and at the other end portion, respectively. The drive member 200 is bridged between the wire locking portion 220 and the wire fixing portion 230 that are separated in the circumferential direction.

In the first modification shown in FIG. 11, the first drive mechanism 28A and the second drive mechanism 28B have the same configuration, and the upper and lower two wire locking portions 220 and the upper and lower two wire fixing portions 230 have optical axes. They overlap when viewed from the L direction. When the rolling correction of the movable body 20 is performed, the first drive mechanism 28A and the second drive mechanism 28B are driven in synchronization with each other. That is, the drive member 200 of the first drive mechanism 28A and the drive member 200 of the second drive mechanism 28B are energized in synchronization with each other. As a result, in the first modification, the driving force can be simultaneously applied to the movable body 20 at two positions above and below the optical axis L direction. Therefore, it is possible to prevent the movable body 20 from tilting when the rolling correction is performed. Therefore, the movement and posture of the movable body 20 in the rolling correction can be stabilized.

(Modification 2)
FIG. 12 is a plan view schematically showing a modification 2 of the rolling drive mechanism 28 and its operation. In the above embodiment, the first drive member (drive members 201, 202) that rotates the movable body 20 in the first rotation direction CW and the second drive member (drive member 203,) that rotates the movable body 20 in the second rotation direction CCW. 204) Although it was provided, in the second modification, the movable body 20 is rotated in two directions, the first rotation direction CW and the second rotation direction CCW, by one driving member 200. As shown in FIG. 12A, the rolling drive mechanism 28 of the second modification includes one drive member 200. The shape of the drive member 200 is the same as the above-mentioned form.

The rolling drive mechanism 28 of the second modification deforms the drive member 200 to an arbitrary length in the process of returning from the shape extended longer than the memory shape to the memory shape by controlling the amount of energization to the drive member 200. Let me. Therefore, in the second modification, as the wire constituting the drive member 200, a wire whose length changes according to the magnitude of the energization amount is used. The rolling drive mechanism 28 of the second modification changes the drive member 200 between the first shape and the second shape (memory shape) in the same manner as in the above embodiment. The shape extended to the length shown in FIG. 12 (c) is the first shape, and the shape contracted to the length shown in FIG. 12 (b) is the second shape. As shown in FIG. 12A, when the movable body 20 is at the origin position of the rolling correction, the driving member 200 changes to a shape (reference shape) in the middle of changing from the first shape to the second shape (memory shape). It has become. The length of the reference shape seen from the optical axis L direction is intermediate between the length of the first shape seen from the optical axis L direction and the length of the second shape (memory shape) seen from the optical axis L direction. Is. The drive member 200 of the second modification has a reference shape when a reference current is applied. Therefore, the movable body 20 is held at the origin position by energizing the drive member 200 with a reference current.

The rolling drive mechanism 28 of the second modification rotates the movable body 20 from the reference position to the first rotation direction CW as shown in FIG. 12B by reducing the current energizing the drive member 200 from the reference current. Let me. When the current energizing the drive member 200 is reduced from the reference current, the length of the drive member 200 when viewed from the optical axis L direction becomes shorter than the reference shape. Therefore, the movable body 20 rotates from the reference position in the first rotation direction CW. Further, the rolling drive mechanism 28 increases the current energizing the drive member 200 from the reference current, so that the movable body 20 is oriented in the direction opposite to the first rotation direction CW from the reference position, as shown in FIG. 12 (c). It is rotated in the second rotation direction CCW of. When the current energizing the drive member 200 is increased from the reference current, the length of the drive member 200 when viewed from the optical axis L direction becomes longer than the reference shape. Therefore, the movable body 20 rotates from the reference position in the second rotation direction CCW.

As described above, in the modification 2, the origin position (reference position) of the rolling correction is set to the position in which the reference current is applied to the drive member 200. As a result, the movable body 20 can be rotated in both the first rotation direction CW and the second rotation direction CCW only by increasing or decreasing the current. Further, even if the number of the driving members 200 is only one, the movable body 20 can be rotated in both the first rotation direction CW and the second rotation direction CCW. Therefore, the rolling drive mechanism 28 can be miniaturized and the degree of freedom in design can be improved.

(Modification 3 and Modification 4)
FIG. 13A is a plan view schematically showing a modification 3 of the rolling drive mechanism 28. FIG. 13B is a plan view schematically showing a modification 4 of the rolling drive mechanism 28. The rolling drive mechanism 28 of the modified examples 3 and 4 includes a plurality of drive members 200. The plurality of drive members 200 are arranged at a plurality of positions in the circumferential direction about the optical axis L. As in the case of the second modification, each drive member 200 can rotate the movable body 20 in both the first rotation direction CW and the second rotation direction CCW with only one drive member 200. As shown in FIG. 13A, the rolling drive mechanism 28 of the third modification includes two drive members 200 arranged on opposite sides of the optical axis L. Further, as shown in FIG. 13B, the rolling drive mechanism 28 of the modified example 4 includes three two drive members 200 arranged evenly distributed in the circumferential direction about the optical axis L. ..

Modifications 3 and 4 energize a plurality of driving members 200 in synchronization with each other. In the modified examples 3 and 4, the plurality of driving members 200 are configured to be rotationally symmetric with respect to the optical axis L. Therefore, since the driving force in the same rotation direction is applied to the plurality of positions with respect to the movable body 20, the driving force can be increased. Further, in the modified examples 3 and 4, since the positions of the plurality of driving members 200 are different in the circumferential direction, the portions on which the driving force acts can be dispersed in the circumferential direction. In the modifications 3 and 4, since the plurality of driving members 200 are evenly distributed in the circumferential direction, the portions on which the driving force acts can be evenly dispersed in the circumferential direction. Further, in the modified examples 3 and 4, the positions of the plurality of driving members 200 in the optical axis L direction are substantially the same. Therefore, the movement and posture of the movable body 20 in the rolling correction can be stabilized.

(Modification 5)
FIG. 14 is a plan view schematically showing a modification 5 of the rolling drive mechanism 28. The rolling drive mechanism 28 of the modified example 5 includes a drive member 200 and an urging portion 240. The driving member 200 and the urging portion 240 connect the movable body 20 and the fixed body 23. The drive member 200 changes between the first shape and the second shape (memory shape) as in the above embodiment. The urging portion 240 is made of an elastic member such as a coil spring, and generates an urging force in the direction of extending the driving member 200 into the first shape. The urging portion 240 is attached so that the driving member 200 is extended to the first shape and is extended beyond the free length. When the drive member 200 changes from the first shape to the second shape (memory shape), the urging portion 240 extends and the urging force increases, and the drive member 200 changes from the second shape (memory shape) to the first shape. Then, the urging unit 240 shrinks and the urging force decreases.

The rolling drive mechanism 28 of the modified example 5 returns the drive member 200 from the first shape to the second shape (memory shape) by energizing the drive member 200, and rotates the movable body 20 in the first rotation direction CW. .. When rotating the movable body 20 in the second rotation direction CCW, the drive member 200 is turned off to lower the temperature of the drive member 200, and the movable body 20 is rotated by the urging force of the urging member 240. In the rolling drive mechanism 28, when the movable body 20 returns to the second shape (memory shape), the urging member 240 extends due to the movable body 20 rotating in the first rotation direction CW, and the urging force increases. Therefore, if the temperature of the driving member 200 drops in this state, the driving member 200 can be extended by the urging force of the urging member 240. Therefore, the movable body 20 rotates in the second rotation direction CCW.

As described above, in the modified example 5, by using the urging member 240, the movable body 20 can be rotated in the first rotation direction CW and the second rotation direction CCW only by turning on / off the energization. Therefore, the drive control of the rolling drive mechanism 28 is easy. The urging portion 240 is not limited to the elastic member. For example, the movable body 20 is urged by a magnetic attraction force acting between a magnet arranged on one of the movable body 20 and the fixed body 23 and a magnetic member arranged on the other side of the movable body 20 and the fixed body 23. A mechanism can also be used.

1 ... Optical unit with runout correction function, 2 ... Cover, 3 ... Optical unit body, 4 ... Lens, 5 ... Imaging module, 6 ... 1st flexible print board, 7 ... 2nd flexible print board, 8 ... 3rd flexible Printed board, 9 ... Imaging element, 10 ... Image side cover, 11 ... Subject side cover, 12 ... First cover, 13 ... Second cover, 19 ... Reinforcing plate, 20 ... Movable body, 21 ... Rotation support mechanism, 22 ... Gimbal mechanism, 23 ... fixed body, 25 ... runout correction drive mechanism, 26 ... first runout correction magnetic drive mechanism, 27 ... second runout correction magnetic drive mechanism, 28 ... rolling drive mechanism, 28A ... first drive mechanism , 28B ... 2nd drive mechanism, 29 ... Holder, 30 ... Imaging module main body, 31 ... Cylindrical part, 35 ... 1st side wall, 36 ... 2nd side wall, 37 ... 3rd side wall, 38 ... 4th side wall, 39 ... 5th side wall, 40 ... 6th side wall, 41 ... 7th side wall, 42 ... 8th side wall, 44 ... 1st yoke, 45 ... 1st magnet, 46 ... 2nd yoke, 47 ... 2nd magnet, 51 ... plate roll , 52 ... Plate holder, 53 ... Sliding member, 54 ... First pressurizing mechanism, 55 ... Second pressurizing mechanism, 56 ... Opposing portion, 57 ... Plate roll annular portion, 58 ... Plate roll extending portion, 59 ... Plate roll annular plate, 60 ... Plate roll annular wall, 62 ... Pressurizing magnet, 63 ... Fixed part, 63a, 63b ... Projection, 65 ... Plate holder annular part, 66 ... Plate holder extension part, 66a ... Plate holder first Extension part, 66b ... Plate holder 2nd extension part, 66c ... Plate holder 3rd extension part, 67 ... Plate holder annular plate, 68 ... Plate holder arc wall, 69 ... First axis side concave curved surface, 75 ... Penetration Hole, 77 ... Plate member, 79 ... Plate roll fixing hole, 80 ... Gimbal frame, 81 ... First connection mechanism, 82 ... Second connection mechanism, 83 ... First shaft side shaft, 84 ... Second shaft side shaft, 85 ... Gimbal frame main body, 85a ... Central plate, 85b ... First inclined plate, 85c ... Second inclined plate, 86 ... First axis side gimbal frame extension, 86a ... First axis side gimbal frame extension Part 1 extension part, 86b ... 1st axis side gimbal frame extension part 2nd extension part, 86c ... 1st axis side gimbal frame extension part 3rd extension part, 87 ... 2nd axis side gimbal frame extension Installation part, 87a ... 2nd axis side gimbal frame extension part 1st extension part, 87b ... 2nd axis side gimbal frame extension part 2nd extension part, 87c ... 2nd axis side gimbal frame extension part 3rd Extension part, 90 ... Opening , 91 ... Ribs, 92 ... Gimbal frame extension through hole, 93 ... First shaft side shaft support cylinder, 94 ... Gimbal frame extension protrusion, 95 ... Second shaft side concave curved surface, 97 ... Case, 98 ... Frame-shaped plate, 99 ... Frame, 101 ... 1st side plate, 102 ... 2nd side plate, 103 ... 3rd side plate, 104 ... 4th side plate, 105 ... 5th side plate, 106 ... 6th side plate, 107 ... 7th side plate, 108 ... 8th side plate, 109 ... 1st coil holding opening, 110 ... 1st coil, 111 ... 2nd coil holding opening, 112 ... 2nd coil, 115 ... notch, 117 ... Through hole, 118 ... Cylinder part, 123 ... First magnetic plate, 141 ... Elastic engaging part, 143 ... Locking part, 200, 201, 202, 203, 204 ... Drive member, 210 ... Wire, 211 ... First part , 212 ... 2nd part, 213 ... straight part, 214 ... wire end part, 215 ... locking part, 220 ... wire locking part, 230 ... wire fixing part, 240 ... urging part, CCW ... second rotation direction, CW ... 1st rotation direction, L ... Optical axis, R1 ... 1st axis, R2 ... 2nd axis

Claims (10)

A movable body equipped with an optical element and
A rotary support mechanism that rotatably supports the movable body about the optical axis of the optical element,
A gimbal mechanism that rotatably supports the rotary support mechanism around a first axis that intersects the optical axis, and rotatably supports the optical axis and a second axis that intersects the first axis.
A fixed body that supports the movable body via the gimbal mechanism and the rotation support mechanism, a rolling drive mechanism that rotates the movable body around the optical axis, and a rolling drive mechanism.
It has a runout correction drive mechanism that swings the movable body around the first axis and around the second axis.
The rolling drive mechanism includes a drive member made of a shape memory alloy.
The driving member includes a first portion connected to the movable body and a second portion connected to the fixed body, and the first portion and the second portion are separated in a circumferential direction around the optical axis. And
The drive member returns to its memory shape when it reaches a predetermined temperature by energization.
A runout correction function characterized by rotating the movable body around the optical axis by controlling the energized state of the drive member and changing the length of the drive member when viewed from the optical axis direction. With optical unit. The driving member has a reference shape in the process of returning to the storage shape by energizing a reference current, and when the driving member has the reference shape, the movable body is located at the origin position of the rolling correction.
By reducing the current energizing the drive member from the reference current, the movable body is rotated from the origin position in the first rotation direction.
The first aspect of the present invention is that the movable body is rotated from the origin position to the second rotation direction opposite to the first rotation direction by increasing the current energizing the drive member from the reference current. Optical unit with runout correction function described in. The driving member is provided with an urging portion that generates an urging force in a direction extending from the memory shape.
By energizing the drive member, the drive member is changed to the memory shape and the movable body is rotated in the first rotation direction.
The first aspect of claim 1, wherein the movable body is rotated in a second rotation direction opposite to the first rotation direction by the urging force of the urging portion without energizing the drive member. Optical unit with runout correction function. A plurality of the driving members arranged at a plurality of positions in the circumferential direction about the optical axis are provided.
The optical unit with a runout correction function according to any one of claims 1 to 3, wherein the plurality of driving members are energized in synchronization with each other. The optical device with a runout correction function according to claim 4, wherein the plurality of driving members have substantially the same position in the optical axis direction and are configured to be rotationally symmetric with respect to the optical axis. unit. The rolling drive mechanism includes a plurality of the drive members.
The plurality of the driving members include a first driving member and a second driving member.
By energizing the first drive member and not energizing the second drive member, the first drive member is returned to the memory shape, the movable body is rotated in the first rotation direction, and the first drive member is rotated. 2 The driving member is deformed from the memory shape,
By energizing the second driving member and not energizing the first driving member, the second driving member is returned to the storage shape and the movable body is moved in the direction opposite to the first rotation direction. The optical unit with a runout correction function according to claim 1, wherein the first driving member is deformed from the storage shape while being rotated in two rotation directions. The driving member is a wire made of a shape memory alloy.
The optical unit with a runout correction function according to any one of claims 1 to 6, wherein one of the first portion and the second portion is a bent portion in which the wire is folded back. The rotation support mechanism is a sliding member that slides in contact with a plate roll fixed to the movable body, a plate holder facing the plate roll in the optical axis direction, and the plate roll and the plate holder. And with
The plate holder is connected to the fixed body via the gimbal mechanism.
The plate roll includes a plate roll annular portion that overlaps the movable body when viewed from the optical axis direction, and a pair of plate roll extending portions that project from the plate roll annular portion on both sides in the second axial direction.
The plate holder includes a plate holder annular portion facing the plate roll annular portion and a pair of plate holder extending portions projecting from the plate holder annular portion on both sides in the first axial direction.
One of the pair of plate roll extension portions and the pair of plate holder extension portions includes a wire locking portion for locking the bent portion.
The runout correction function according to claim 7, wherein the other of the pair of plate roll extension portions and the pair of plate holder extension portions includes a wire fixing portion to which the end portion of the wire is fixed. Optical unit. The rolling drive mechanism includes two sets of drive mechanisms arranged at two locations, one end of the movable body on one side in the optical axis direction and the other end of the movable body in the optical axis direction. Prepare,
The two sets of drive mechanisms are driven synchronously and
The optical unit with a runout correction function according to any one of claims 1 to 8, wherein each of the two sets of drive mechanisms includes at least one drive member. A flexible printed circuit board connected to the drive member is provided.
The optical unit with a runout correction function according to any one of claims 1 to 9, wherein the flexible printed circuit board is formed with an energization pattern for energizing the drive member.

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