Optical unit with shake correction function

Abstract

To provide an optical unit with a shake correction function which prevents a load from being applied to the side of an imaging element via a heat radiation member in rotation of a movable body.SOLUTION: An optical unit 1 with a shake correction function comprises: a movable body 5 which includes a camera module 2 and a holder 50; and a rotation support mechanism 15 which rotates the movable body 5 around an optical axis L. The camera module 2 comprises: an imaging element 12; and a substrate 13 on which the imaging element 12 is mounted. The substrate 13 includes an exposed portion 13a which is exposed from the camera module. The rotation support mechanism 15 comprises: a first member 51; a second member 87 which is supported in a manner of rotatable around the first axis by an oscillation support mechanism 16; and a rotation mechanism 88 which makes the first member 51 and the second member 87 relatively rotatable around the optical axis L. The first member 51 is fixed to the holder 50 and the heat radiation member 53 is in contact with the exposed portion 13a of the substrate 13 and the first member 51.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to an optical unit with a shake correction function that corrects shake by rotating a camera module around an optical axis. [Background technology]

[0002] Among optical units mounted on mobile terminals and mobile objects, there are some that rotate the camera module around the optical axis, around a first axis intersecting the optical axis, and around a second axis intersecting the optical axis and the first axis in order to suppress distortion of captured images when the mobile terminal or mobile object is moving. Patent Document 1 describes this type of optical unit with a shake correction function.

[0003] The optical unit with shake correction function of Patent Document 1 includes a camera module having an image sensor, a frame-shaped support that surrounds the camera module from the outside in the radial direction, a gimbal frame that is disposed on the inner periphery of the support and supported by the support in a state that allows it to rotate around a first axis and a second axis, and a rotation support mechanism that supports the camera module rotatably around the optical axis. The gimbal frame supports the camera module via the rotation support mechanism.

[0004] In the document, the gimbal frame includes four support extensions extending radially outward from the camera module in the optical axis direction. The rotation support mechanism includes a metal rolling frame that connects the camera module to the gimbal frame. The rolling frame includes a rectangular frame portion that surrounds the image sensor, a protruding portion that protrudes from the rectangular frame portion in the optical axis direction and is soldered to the land of the image sensor, four extensions that extend outward from the four corners of the rectangular frame portion, and a connecting portion that connects the four extensions to the four support extensions of the gimbal frame. The connecting portion includes a fixing portion that is fixed to the extensions, a U-shaped portion that is substantially U-shaped, and an engaging portion that engages with the tip of the support extension. The U-shaped portion is a thin plate, and allows the camera module to rotate around the optical axis relative to the gimbal frame by deforming. The rolling frame also serves as a heat dissipating member that dissipates heat generated by the image sensor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-167594 A Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, when the camera module rotates around the optical axis, the rolling frame is deformed. In other words, when the camera module rotates around the optical axis, the heat dissipation member in contact with the imaging element is deformed. Therefore, there is a possibility that the stress generated in the heat dissipation member when the camera module rotates may apply a load to the imaging element.

[0007] The object of the present invention is to provide an optical unit with shake correction function in which, when a configuration is adopted in which heat generated by the image sensor is dissipated from a rotary support mechanism that rotatably supports a camera module around an optical axis, no load is applied from the rotary support mechanism to the image sensor via a heat dissipation member. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides an optical unit with shake correction function, comprising: a camera module; a movable body having a holder for holding the camera module; a rotation support mechanism for supporting the movable body so that the movable body can rotate about an optical axis of the camera module; the camera module comprises a swing support mechanism that supports a support mechanism rotatably around a first axis that intersects the optical axis and the rotating support mechanism rotatably around a second axis that intersects the optical axis and the first axis, and a support body that supports the movable body via the swing support mechanism and the rotating support mechanism, wherein the camera module comprises an image sensor, a board on which the image sensor is mounted, and a case that houses the image sensor and the board, the rotating support mechanism comprises a first member fixed to the holder, a second member supported by the swing support mechanism rotatably around the first axis, and a rotating mechanism that allows the first member and the second member to rotate relatively around the optical axis, the first member is made of metal, the board has an exposed portion that is exposed to the outside from the case, and the movable body has a heat dissipation member in contact with the exposed portion of the board and the first member, and heat from the image sensor is conducted from the board to the first member via the heat dissipation member.

[0009] According to the present invention, the rotation support mechanism includes a first member fixed to a holder that holds a camera module, a second member supported by a swing support mechanism so as to be rotatable around a first axis, and a rotation mechanism that allows the first member and the second member to rotate relatively around the optical axis. The heat dissipation member is in contact with an exposed portion of a substrate on which an optical element is mounted and the first member of the rotation support mechanism, and heat from the imaging element is conducted from the substrate to the first member via the heat dissipation member. Here, the first member of the rotation support mechanism that is in contact with the heat dissipation member is fixed to a holder that holds a camera module. Therefore, when the movable body rotates around the optical axis, the first member rotates together with the camera module and does not rotate relatively. Therefore, even if a configuration that dissipates heat is adopted for the rotation support mechanism, no force is applied to the imaging element side via the heat dissipation member when the movable body rotates.

[0010] In the present invention, the heat dissipation member may be a metal paste applied between the substrate and the first member, which makes it easier to bring the heat dissipation member into contact with both the substrate and the first member.

[0011] In the present invention, the heat dissipation member may be a metal member disposed between the substrate and the first member and in contact with the substrate and the holder.

[0012] In the present invention, the holder includes a frame portion surrounding the camera module from the radial outside, the first member includes a first annular plate portion surrounding the optical axis and overlapping with the camera module when viewed from the optical axis direction, and an extension portion located radially outside the camera module, the second member includes a second annular plate portion facing the first annular plate portion in the optical axis direction and disposed between the first annular plate portion and the camera module in the optical axis direction, the rotation mechanism includes a first annular groove provided in the first annular plate portion, a second annular groove provided in the second annular plate portion facing the first annular groove in the optical axis direction, and a plurality of rolling elements inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion, the extension portion being fixed to the holder, and the heat dissipation member being in contact with the extension portion. By adopting such a configuration, the first member constituting the rotation support mechanism can be fixed to the holder of the movable body.

[0013] In the present invention, the frame portion includes a fixing hole into which the extension portion is inserted from the optical axis direction, and an opening provided on an inner peripheral surface of the frame portion to expose a part of the extension portion inserted into the fixing hole to the radially inward direction, the exposed part of the substrate faces the opening, and the heat dissipation member can be in contact with the extension portion through the opening. In this way, it is easy to bring the heat dissipation member into contact with both the extension portion of the first member fixed to the holder and the substrate of the camera module.

[0014] In the present invention, the frame portion has a fixing hole penetrating in the optical axis direction, and the extension portion has a through portion penetrating the fixing hole and an end of the through portion opposite to the first annular plate portion. The substrate may have a bent portion bent radially inward and overlapping with the camera module when viewed from the optical axis direction, the exposed portion of the substrate faces the bent portion, and the heat dissipation member may be in contact with the bent portion. This also makes it easy to connect the heat dissipation member to both the substrate and the first member.

[0015] In this example, the camera includes a shake correction magnetic drive mechanism that rotates the movable body around the first axis or the second axis, the support includes a support side frame portion that surrounds the holder from the radial outside, the shake correction magnetic drive mechanism includes a drive coil fixed to the support side frame portion and a drive magnet that is held by the movable body and faces the drive coil, the first member includes a second extension portion that is located on the radial outside of the camera module at an angular position different from the extension portion around the optical axis, the drive magnet is fixed to the second extension portion, and the second extension portion is fixed to the holder and is located on the opposite side of the drive magnet to the drive coil. In this way, the first member made of metal that constitutes the rotation support mechanism releases heat from the image sensor and functions as a back yoke for the drive magnet. In addition, the second extension portion to which the drive magnet is fixed is separated from the heat dissipation member with which the heat dissipation member comes into contact, so that the heat from the image sensor can be prevented or suppressed from being transmitted to the drive magnet.

[0016] In the present invention, the substrate may include a substrate body on which the imaging element is mounted and a heat sink fixed to the substrate body, and the heat sink may be in contact with the heat sink. In this way, heat from the imaging element is transferred from the heat sink of the substrate to the first member via the heat sink. Effect of the Invention

[0017] According to the present invention, the heat dissipation member that conducts heat from the imaging element to the rotary support mechanism contacts the substrate on which the imaging element is mounted and the first member of the rotary support mechanism. Since the first member is fixed to the holder that holds the camera module, when the movable body supported by the rotary support mechanism rotates around the optical axis, the first member rotates together with the camera module and does not rotate relative to the camera module. Therefore, no load is applied to the imaging element via the heat dissipation member when the movable body rotates. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of an optical unit with a shake correction function. [Diagram 2] FIG. 2 is an exploded perspective view of an optical unit with a shake correction function. [Diagram 3] FIG. 2 is a plan view of the optical unit with shake correction function with the cover removed, as viewed from the subject side. [Figure 4] FIG. 2 is an exploded perspective view of the optical unit with shake correction function with the cover and base removed. [Diagram 5] 4 is a cross-sectional view of the optical unit with shake correction function taken along line AA in FIG. 3. [Figure 6] 4 is a cross-sectional view of the optical unit with shake correction function taken along the line BB in FIG. 3. [Figure 7] FIG. 2 is an exploded perspective view of a movable body, a rotation support mechanism, and a swing support mechanism. [Figure 8] FIG. 2 is an exploded perspective view of a movable body and a rotation support mechanism. [Figure 9] FIG. [Figure 10] 4 is a cross-sectional view of the optical unit with shake correction function taken along line AA in FIG. 3. [Figure 11] FIG. 11 is a cross-sectional view of a modified optical unit with a shake correction function. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an optical unit with a shake correction function to which the present invention is applied will be described with reference to the drawings.

[0020] (Overall composition) FIG. 1 is a perspective view of an optical unit with a shake correction function. FIG. 3 is an exploded perspective view of the optical unit with shake correction function with the cover removed, viewed from the subject side. FIG. 4 is an exploded perspective view of the optical unit with shake correction function with the cover and base removed. FIG. 5 is a cross-sectional view of the optical unit with shake correction function cut at position AA in FIG. 3. FIG. 6 is a cross-sectional view of the optical unit with shake correction function cut at position BB in FIG. 3. FIG. 7 is an exploded perspective view of the movable body, the rotation support mechanism, and the swing support mechanism.

[0021] As shown in Figs. 1 and 2, the optical unit 1 with shake correction function includes a movable body 5 having a camera module 2, and a support 6 surrounding the movable body 5 from the outer periphery. The support 6 includes a frame 7 surrounding the movable body 5 from the outer periphery, a cover 8 fixed to the frame 7 from the subject side, and a base 9 fixed to the frame 7 from the opposite subject side and covering the movable body 5 from the opposite subject side. The frame 7 is made of resin. The cover 8 and the base 9 are non-magnetic metal plates. Also, as shown in Fig. 2, the optical unit 1 with shake correction function includes a flexible printed circuit board 10 drawn out from the movable body 5, and a flexible printed circuit board 11 routed along the outer periphery of the frame 7.

[0022] The optical unit 1 with shake correction function is used in optical devices such as camera-equipped mobile phones and drive recorders, and in optical devices such as action cameras and wearable cameras mounted on moving objects such as helmets, bicycles, and radio-controlled helicopters. In such optical devices, if the optical device shakes during shooting, the captured image will be distorted. In order to prevent the captured image from being tilted, the optical unit 1 with shake correction function corrects the tilt of the camera module 2 based on the acceleration, angular velocity, amount of shake, etc. detected by a detection means such as a gyroscope.

[0023] The camera module 2 includes a lens 2a. As shown in Fig. 5 and Fig. 6, the camera module 2 also includes an image sensor 12 therein. The image sensor 12 is mounted on a substrate 13 and disposed on the optical axis L of the lens 2a. The optical unit 1 with shake correction function performs shake correction by rotating the camera module 2 around the optical axis L of the lens 2a, around a first axis R1 perpendicular to the optical axis L, and around a second axis R2 perpendicular to the optical axis L and the first axis R1.

[0024] In the following description, the three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis directions. One side in the X-axis direction is referred to as the -X direction, and the other side as the +X direction. One side in the Y-axis direction is referred to as the -Y direction, and the other side as the +Y direction. One side in the Z-axis direction is referred to as the -Z direction, and the other side as the +Z direction. The Z-axis direction is the optical axis direction along the optical axis L of the camera module. The -Z direction is the side of the camera module 2 opposite the subject, and the +Z direction is the subject side of the camera module 2. The first axis R1 and the second axis R2 are inclined at 45 degrees around the Z axis (around the optical axis) with respect to the X-axis and Y-axis.

[0025] 4, the optical unit 1 with shake correction function has a rotation support mechanism 15 that supports the movable body 5 rotatably around the Z axis. The optical unit 1 with shake correction function also has a swing support mechanism 16 that supports the rotation support mechanism 15 rotatably around a first axis R1 and supports the rotation support mechanism 15 rotatably around a second axis R2. The movable body 5 is supported by the support 6 via the rotation support mechanism 15 and the swing support mechanism 16 in a state where it can rotate around the first axis R1 and the second axis R2.

[0026] As shown in Fig. 3, the swaying support mechanism 16 includes a gimbal frame 17 and a first connection mechanism 18 that connects the gimbal frame 17 and the rotation support mechanism 15 to be rotatable about a first axis R1. The first connection mechanisms 18 are provided on both sides of the gimbal frame 17 in the direction of the first axis R1. The swaying support mechanism 16 also includes a second connection mechanism 19 that connects the gimbal frame 17 and the support 6 to be rotatable about a second axis R2. The second connection mechanism 19 is provided on both sides of the gimbal frame 17 in the direction of the first axis R1. 7 in the direction of the second axis R2.

[0027] The optical unit 1 with shake correction function also includes a shake correction magnetic drive mechanism 20 that rotates the movable body 5 around the first axis R1 and the second axis R2. As shown in FIG. 3, the shake correction magnetic drive mechanism 20 includes a first shake correction magnetic drive mechanism 21 that generates a drive force around the X axis to the movable body 5, and a second shake correction magnetic drive mechanism 22 that generates a drive force around the Y axis to the movable body 5. The first shake correction magnetic drive mechanism 21 and the second shake correction magnetic drive mechanism 22 are arranged in the circumferential direction around the Z axis. In this example, the first shake correction magnetic drive mechanism 21 is disposed in the -Y direction of the camera module 2. The second shake correction magnetic drive mechanism 22 is disposed in the -X direction of the camera module 2.

[0028] The movable body 5 rotates about the X-axis and the Y-axis by combining the rotation about the first axis R1 and the rotation about the second axis R2, whereby the optical unit 1 with shake correction function performs pitching correction about the X-axis and yawing correction about the Y-axis.

[0029] Furthermore, the optical unit 1 with shake correction function has a magnetic drive mechanism 29 for rolling correction that rotates the movable body 5 around the Z axis. In this example, the magnetic drive mechanism 29 for rolling correction is disposed in the -Y direction of the camera module 2. The magnetic drive mechanisms 29 for rolling correction are also disposed on both sides of the first magnetic drive mechanism 21 for shake correction in the circumferential direction.

[0030] (Support) As shown in FIG. 2, the frame 7 includes a frame portion 23 (support-side frame portion) surrounding the movable body 5 and the rotation support mechanism 15 from the outer periphery, and a rectangular wiring accommodating portion 24 provided in the +X direction of the frame portion 23. As shown in FIG. 4, the frame portion 23 includes a first side plate portion 25 and a second side plate portion 26 facing each other in the X direction, and a third side plate portion 27 and a fourth side plate portion 28 facing each other in the Y direction. The first side plate portion 25 is located in the -X direction of the second side plate portion 26. The third side plate portion 27 is located in the -Y direction of the fourth side plate portion 28. The second side plate portion 26 is provided with a notch portion 26a formed by cutting out an edge in the -Z direction. A flexible printed circuit board 10 connected to the imaging element 12 via a substrate 13 is drawn out in the +X direction from the end portion in the -Z direction of the movable body 5. The flexible printed circuit board 10 is pulled out in the +X direction from the frame portion 23 through the cutout portion 26 a and accommodated in the wiring accommodation portion 24 .

[0031] As shown in Figs. 1 and 2, cover 8 is fixed to the +Z end of frame 7. Cover 8 has an opening 8a at a position overlapping with frame frame portion 23 when viewed from the Z-axis direction. Camera module 2 is located inside opening 8a. Base 9 is fixed to the -Z end of frame 7. Base 9 covers frame frame portion 23 and wiring housing portion 24 from the -Z direction.

[0032] Here, as shown in FIG. 4, a first coil fixing hole 27a is provided in the third side plate portion 27 of the frame 7. The first coil fixing hole 27a holds a first coil 31 (drive coil) and a pair of third coils 33. The pair of third coils 33 are located on both sides of the first coil 31 in the circumferential direction. A second coil fixing hole 25a is provided in the first side plate portion 25 of the frame 7. The second coil fixing hole 25a holds a second coil 32 (drive coil). The first coil 31 and the second coil 32 are oval air-core coils that are long in the circumferential direction. The third coil 33 is an oval air-core coil that is long in the Z-axis direction. The first coil 31, the second coil 32, and the third coil 33 are electrically connected to a flexible printed circuit board 11 that is routed along the outer circumferential surface of the frame portion 23. The flexible printed circuit board 11 is fixed to the frame 7.

[0033] (Swing support mechanism) The gimbal frame 17 is made of a metal leaf spring. As shown in FIG. 7, the gimbal frame 17 includes a gimbal frame main body 35 having an opening 35a penetrating in the Z-axis direction at the center. As shown in FIG. 4, the gimbal frame 17 includes a pair of first gimbal frame extensions 36 that protrude from the gimbal frame main body 35 toward both sides in the first axis R1 direction and extend in the -Z direction, and a pair of second gimbal frame extensions 37 that protrude from the gimbal frame main body 35 toward both sides in the second axis R2 direction and extend in the -Z direction. The gimbal frame main body 35 is located in the +Z direction of the frame 7. The pair of first gimbal frame extensions 36 and the pair of second gimbal frame extensions 37 extend in the Z-axis direction on the radially outer side of the movable body 5. The pair of first gimbal frame extensions 36 and the pair of second gimbal frame extensions 37 are located on the radially inner side of the frame frame portion 23 of the frame 7.

[0034] As shown in Figs. 3 and 5, the first connection mechanism 18 is provided on both sides of the movable body 5 in the first axis R1 direction. As shown in Fig. 7, the first connection mechanism 18 includes a pair of first gimbal frame support members 41 fixed to the rotation support mechanism 15 on both sides of the movable body 5 in the first axis R1 direction. As shown in Fig. 5, each of the first gimbal frame support members 41 includes a first sphere 42 and a first thrust support member 43 to which the first sphere 42 is fixed. Each of the first thrust support members 43 is fixed to the rotation support mechanism 15. When the first thrust support member 43 is fixed to the rotation support mechanism 15, the first sphere 42 faces the movable body 5 side on the first axis R1.

[0035] The first connection mechanism 18 also includes a first concave surface 36a provided at an end portion of each of the first gimbal frame extension parts 36 in the -Z direction. The first concave surface 36a is recessed toward the movable body 5 in the first axis R1 direction. When assembling the sway support mechanism 16, the gimbal frame 17 is inserted into the inner periphery of a pair of first gimbal frame receiving members 41 fixed to the rotation support mechanism 15, and the first concave surface 36a of each of the first gimbal frame extension parts 36 is brought into point contact with each of the first spheres 42 on the first axis R1. This forms the first connection mechanism 18, and the rotation support mechanism 15 is supported by the gimbal frame 17 in a state in which it can rotate around the first axis R1.

[0036] As shown in Figs. 3 and 6, the second connection mechanism 19 is provided at a diagonal position in the second axis R2 direction of the frame portion 23. The second connection mechanism 19 includes second gimbal frame support members 45 fixed to the frame portion 23 at diagonal positions in the second axis R2 direction. The second gimbal frame support member 45 includes a second sphere 46 and a second thrust support member 47 to which the second sphere 46 is fixed. The second thrust support member 47 is fixed to a diagonal position of the frame portion 23. As shown in Fig. 6, when the second gimbal frame support member 45 is fixed to the frame portion 23 at a diagonal position, the second sphere 46 protrudes from the second thrust support member 47 on the second axis R2 toward the movable body 5 side.

[0037] The second connection mechanism 19 also includes a second concave curved surface 37a provided at an end portion of each second gimbal frame extension portion 37 in the -Z direction. The second concave curved surface 37a is recessed toward the movable body 5 in the second axis R2 direction. When assembling the sway support mechanism 16, the gimbal frame 17 is inserted into the inner peripheral side of a pair of second gimbal frame receiving members 45 fixed to the frame portion 23, and the second concave curved surface 37a is brought into point contact with the second sphere 46 on the second axis R2. This forms the second connection mechanism 19, and the gimbal frame 17 is supported by the frame portion 23 (support 6) in a state in which it can rotate around the second axis R2.

[0038] (movable body) 8 is an exploded perspective view of the movable body 5 and the rotation support mechanism 15. FIG. 9 is a perspective view of the holder. FIG. 10 is a cross-sectional view taken along line CC in FIG. 3. As shown in FIG. 8, the movable body 5 includes the camera module 2, a frame-shaped holder 50 that holds the camera module 2, and a first member 51 fixed to the holder 50. The first member 51 is a part of the configuration of the rotation support mechanism 15. The movable body 5 also includes two heat dissipation members 53 located between the camera module 2 and the first member 51. Each heat dissipation member 53 is a metallic member having a rectangular parallelepiped shape. The holder 50 is made of resin. The first member 51 is made of magnetic metal. Each heat dissipation member 53 conducts heat from the imaging element 12 of the camera module 2 to the rotation support mechanism 15 side and dissipates it.

[0039] The camera module 2 includes a module case 55 (case) having a substantially octagonal contour shape when viewed from the +Z direction, and a lens barrel 56 protruding from the center of the module case 55 in the +Z direction. The lens barrel 56 houses the lens 2a. As shown in FIG. 5 and FIG. 6, the module case 55 houses the board 13 and the imaging element 12 mounted on the board 13. The board 13 is arranged so that its thickness direction faces the Z-axis direction and perpendicular to the optical axis L. The imaging element 12 is fixed to the board surface facing the +Z direction of the board 13. The imaging element 12 is located on the optical axis L. As shown in FIG. 8, the end face of the board 13 in the +Y direction is exposed radially outward from the module case 55. That is, the module case 55 includes a slit-shaped opening 55a having a width corresponding to the thickness of the board 13 on the side wall in the +Y direction. The +Y direction end of the substrate 13 fits into the opening 55a, and the +Y direction end face of the substrate is exposed to the outside from the opening 55a. The +Y direction end face of the substrate is an exposed portion 13a of the substrate 13 that is exposed to the outside from the module case 55.

[0040] The holder 50 includes a frame portion 57 that surrounds the module case 55 from the radially outer side. The frame portion 57 has a contour shape that is substantially octagonal when viewed from the +Z direction. As shown in FIG. 8 and FIG. 9, the frame portion 57 includes a first side wall 61 and a second side wall 62 that extend parallel to the Y direction, and a third side wall 63 and a fourth side wall 64 that extend parallel to the X direction. The first side wall 61 is located in the -X direction of the second side wall 62. The third side wall 63 is located in the -Y direction of the fourth side wall 64. The frame portion 57 also includes a fifth side wall 65 and a sixth side wall 66 that are diagonally positioned in the first axis R1 direction, and a seventh side wall 67 and an eighth side wall 68 that are diagonally positioned in the second axis R2 direction. The fifth side wall 65 is located in the -X direction of the sixth side wall 66. The seventh side wall 67 is located in the -Y direction of the eighth side wall 68.

[0041] The first side wall 61 has a first recess 71 in a circumferentially long rectangular shape on an end surface facing the -X direction. The first recess 71 opens in the -X direction and the +Z direction. The second side wall 62 has a first fixing hole 72 extending in the -Z direction on an end surface facing the +Z direction. The first fixing hole 72 is a slit-like hole extending long in the Y-axis direction. As shown in FIG. 8, a notch 73 is provided on the edge of the second side wall 62 in the -Z direction. The flexible printed circuit board 10 connected to the image sensor 12 via the substrate 13 is drawn from the end of the camera module 2 in the -Z direction through the notch 73 to the +X direction of the movable body 5.

[0042] As shown in FIG. 9, the third side wall 63 has a rectangular second recess 74 that is long in the circumferential direction at the center of the end face facing the -Y direction. The second recess 74 opens in the -Y direction and the +Z direction. The third side wall 63 also has rectangular third recesses 75 that are long in the Z axis direction on both sides of the second recess 74 in the circumferential direction. Each of the third recesses 75 opens in the -Y direction and the +Z direction. As shown in FIG. 8 and FIG. 9, the fourth side wall 64 has a second fixing hole 76 on the end face facing the +Z direction. The second fixing hole 76 is a slit-shaped hole that extends long in the X axis direction.

[0043] As shown in Fig. 8, the first member 51 includes a first annular plate portion 70 having a through-hole 70a in the center. The lens barrel 56 of the camera module 2 penetrates the through-hole 70a and protrudes from the first annular plate portion 70 in the +Z direction. When viewed from the Z-axis direction, the first annular plate portion 70 overlaps with the module case 55. The first annular plate portion 70 surrounds the optical axis L. As shown in Figs. 5 and 6, a circular first annular groove 70b is provided on an end face of the first annular plate portion 70 facing the -Z direction.

[0044] As shown in FIG. 8, the first member 51 has two protruding portions 71a and 71b protruding from the first annular plate portion 70 on both sides in the X-axis direction. The first member 51 includes a first extension portion 77 (second extension portion) and a second extension portion 78 protruding from the first annular plate portion 70 on both sides in the Y-axis direction, and a third extension portion 79 (second extension portion) and a fourth extension portion 80 (extension portion) protruding on both sides in the Y-axis direction. Furthermore, the first member 51 includes four first protruding plate portions 89 protruding from the first annular plate portion 70 on both sides in the first axis R1 direction and on both sides in the second axis R2 direction.

[0045] The first extension portion 77 protrudes from the first annular plate portion 70 in the -X direction and bends in the -Z direction on the outer periphery side of the camera module 2. The first extension portion 77 has a wide portion 77a that expands in the circumferential direction at an end portion in the -Z direction. The wide portion 77a of the first extension portion 77 is inserted into the first recess 71 and fixed to the holder 50. As shown in FIG. 4, a second magnet 83 (drive magnet) is fixed to the wide portion 77a of the first extension portion 77. As a result, the second magnet 83 is fixed to the holder 50 while being accommodated in the first recess 71. The second magnet 83 is two-pole magnetized in the Z axis direction. The magnetization polarization line of the second magnet 83 extends in the circumferential direction.

[0046] The second extension portion 78 protrudes in the +X direction from the first annular plate portion 70, and bends in the -Z direction on the outer periphery side of the camera module 2. The -Z end portion of the fourth extension portion 80 is inserted into the first fixing hole 72 and fixed to the holder 50.

[0047] The third extension portion 79 protrudes from the first annular plate portion 70 in the -Y direction and bends in the -Z direction on the outer periphery side of the camera module 2. The end portion of the third extension portion 79 in the -Z direction is inserted into the second recess 74 and fixed to the holder 50. The first magnet 82 (drive magnet) is fixed to the end portion of the third extension portion 79 in the -Z direction. The first magnet 82 is fixed to the holder 50 while being accommodated in the second recess 74. The first magnet 82 is two-pole magnetized in the Z-axis direction. The magnetization polarization line of the first magnet 82 extends in the circumferential direction. Here, the first member 51 is made of a magnetic metal, and therefore functions as a yoke for the first magnet 82 and the second magnet 83.

[0048] A third magnet 84 is housed in each of the third recesses 75 of the third side wall 63. The third magnet 84 is bipolarly magnetized in the circumferential direction. The magnetization polarization lines of the third magnet 84 extend in the Z-axis direction. In this example, the third magnet 84 is fixed to the third side wall 63 via a metal plate 85 made of a magnetic material. The metal plate 85 functions as a yoke for the third magnet 84.

[0049] As shown in FIG. 8, the fourth extension portion 80 includes a first portion 80a extending in the +Y direction from the first annular plate portion 70, a second portion 80b extending in the -Z direction from the tip of the first portion 80a, a wide third portion 80c extending on both sides in the circumferential direction from the +Z end of the first extension portion 77, and a pair of fourth portions 80d extending in the -Z direction from one circumferential end portion and the other circumferential end portion of the third portion 80c, respectively.

[0050] Here, as shown by the chain lines in Figs. 8 and 9, the second fixing hole 76 of the fourth side wall 64 to which the fourth extension portion 80 is fixed has a shape corresponding to the third portion 80c and the pair of fourth portions 80d of the fourth extension portion 80. That is, the second fixing hole 76 has a wide first hole portion 76a that receives the third portion 80c, and a pair of second hole portions 76b that extend in the -Z direction from one end portion and the other end portion in the circumferential direction of the first hole portion 76a. The -Z direction end of each second hole portion 76b opens on the end face of the fourth extension portion 80 in the -Z direction. That is, the second fixing hole 76 penetrates the fourth side wall 64 in the Z-axis direction. As shown in Fig. 7, the fourth extension portion 80 is fixed to the holder 50 by inserting the third portion 80c and the pair of fourth extension portions 80 into the second fixing hole 76.

[0051] As shown in FIG. 9, the fourth side wall 64 has openings at two locations on the inner circumferential surface that are spaced apart from each other in the circumferential direction. 86. Each opening 86 is in communication with a pair of second hole portions 76b. Therefore, each opening 86 exposes a part of the fourth portion 80d of the fourth extension portion 80 inserted into the second fixing hole 76 to the radially inward side. When the holder 50 holds the camera module 2, each opening 86 faces the exposed portion 13a of the substrate 13 in the radial direction.

[0052] 10, each heat dissipation member 53 is disposed between the camera module 2 and the fourth extension portion 80 in the radial direction. An end of each heat dissipation member 53 on the camera module 2 side contacts the exposed portion 13a of the substrate 13. An end of each heat dissipation member 53 opposite to the camera module 2 contacts the fourth portion 80d of the fourth extension portion 80 through each opening 86.

[0053] (Rotational support mechanism) As shown in FIG. 8, the rotation support mechanism 15 includes a first member 51 fixed to a holder 50 that holds the camera module 2, a second member 87 supported by the swing support mechanism 16 so as to be rotatable around a first axis, and a rotation mechanism 88 that allows the first member 51 and the second member 87 to rotate relatively around the optical axis L. The second member 87 includes a second annular plate portion 90 that faces the first annular plate portion 70 of the first member 51 in the Z-axis direction. The second annular plate portion 90 is located between the first annular plate portion 70 and the module case 55 in the Z-axis direction. The second member 87 also includes a pair of extension portions 91 that protrude from the second annular plate portion 90 on both sides in the first axis R1 direction, and a pair of second protruding plate portions 92 that protrude from the second annular plate portion 90 on both sides in the second axis R2 direction.

[0054] Each of the pair of extension portions 91 includes a first portion 91a extending from the second annular plate portion 90 in the first axis R1 direction, and a second portion 91b extending in the Z-axis direction on the outer circumferential side of the movable body 5. As shown in Fig. 5, the second portion 91b faces the movable body 5 with a small gap therebetween, on the outer side of the movable body 5 in the first axis R1 direction. As shown in Figs. 5 and 8, a first gimbal frame receiving member 41 is fixed to the surface of each second portion 91b opposite to the movable body 5.

[0055] 8, the rotation mechanism 88 includes a first annular groove 70b provided in the first annular plate portion 70 of the first member 51, and a second annular groove 93 provided in the second annular plate portion 90 and facing the first annular groove 70b in the Z-axis direction. The rotation mechanism 88 also includes a plurality of rolling elements 94 that are inserted into the first annular groove 70b and the second annular groove 93 and roll between the first annular plate portion 70 and the second annular plate portion 90, and an annular retainer 95 that holds the rolling elements 94 rotatably between the first annular plate portion 70 and the second annular plate portion 90. The rotation mechanism 88 also includes a pressure mechanism 96 that applies a force that brings the first annular groove 70b and the second annular groove 93 closer to each other in the Z-axis direction.

[0056] The pressurizing mechanism 96 includes pressurizing magnets 97 arranged at four positions around the optical axis L of the second member 87, and first protruding plate portions 89 provided at four positions around the optical axis L of the first member 51. When the movable body 5 and the rotation support mechanism 15 are assembled, each of the four pressurizing magnets 97 arranged on the second member 87 overlaps with the first protruding plate portions 89 provided at the four positions on the movable body 5 in the optical axis L direction.

[0057] The first protruding plate portions 89 are made of a magnetic metal. Therefore, the first protruding plate portions 89 that overlap with the respective pressurizing magnets 97 in the direction of the optical axis L are attracted toward the pressurizing magnets 97 due to the magnetic attraction force of the pressurizing magnets 97. As a result, the pressurizing mechanism 96 applies a force that brings the first annular groove 70b and the second annular groove 93 closer to each other in the Z-axis direction at four locations equiangularly spaced around the optical axis L. The movable body 5 is attracted to the second member 87 by the magnetic attraction force of the pressurizing mechanism 96, and is supported by the second member 87 in a state in which it can rotate around the Z-axis.

[0058] (Magnetic drive mechanism) Here, as can be seen from FIG. 4, when the movable body 5 is supported by the support 6 via the rotation support mechanism 15 and the swing support mechanism 16, the first coil held by the third side plate portion 27 of the support 6 is The coil 31 and the first magnet 82 held on the side surface of the movable body 5 in the -Y direction face each other in the Y-axis direction. The first coil 31 and the first magnet 82 constitute a first shake correction magnetic drive mechanism 21. The second coil 32 held on the first side plate portion 25 of the support 6 and the second magnet 83 held on the side surface of the movable body 5 in the -X direction face each other in the X-axis direction. The second coil 32 and the second magnet 83 constitute a second shake correction magnetic drive mechanism 22. Furthermore, the pair of third coils 33 held on the third side plate portion 27 of the support 6 and the pair of third magnets 84 held on the side surface of the movable body 5 in the -Y direction face each other in the Y-axis direction. The pair of third coils 33 and the pair of third magnets 84 constitute a rolling correction magnetic drive mechanism 29.

[0059] (Action and effect) In this example, the rotation support mechanism 15 includes a first member 51 fixed to a holder 50 that holds the camera module 2, a second member 87 that is supported by the swing support mechanism 16 so as to be rotatable around a first axis, and a rotation mechanism 88 that allows the first member 51 and the second member 87 to rotate relatively around the optical axis L. The heat dissipation member 53 contacts the exposed portion 13a of the substrate 13 on which the imaging element 12 is mounted and the first member 51 of the rotation support mechanism 15. Heat from the imaging element 12 is conducted from the substrate 13 to the first member 51 via the heat dissipation member 53. Here, the metal first member 51 that the heat dissipation member 53 contacts is fixed to the holder 50 that holds the camera module 2. Therefore, when the movable body 5 supported by the rotation support mechanism 15 rotates around the optical axis L, the first member 51 rotates integrally with the camera module 2 and does not rotate relatively. Therefore, even if a configuration for dissipating heat is adopted for the rotation support mechanism 15, no force is applied to the imaging element 12 side via the heat dissipation member 53 when the movable body 5 rotates.

[0060] In this example, the heat dissipation member 53 may be a metal member that is disposed between the substrate 13 and the first member 51 and that abuts against the substrate 13 and the holder 50.

[0061] In this example, the holder 50 includes a frame portion 57 that surrounds the camera module 2 from the radially outer side. The first member 51 includes a first annular plate portion 70 that surrounds the optical axis L and overlaps with the camera module 2 when viewed from the optical axis L direction, and a first extension portion 77, a fourth extension portion 80, a third extension portion 79, and a fourth extension portion 80 that are located radially outward of the camera module 2. The second member 87 includes a second annular plate portion 90 that faces the first annular plate portion 70 in the Z-axis direction and is disposed between the first annular plate portion 70 and the camera module 2 in the Z-axis direction. The rotation mechanism 88 includes a first annular groove 70b provided in the first annular plate portion 70, a second annular groove 93 provided in the second annular plate portion 90 and facing the first annular groove 70b in the Z-axis direction, and a plurality of rolling elements 94 inserted into the first annular groove 70b and the second annular groove 93 and rolling between the first annular plate portion 70 and the second annular plate portion 90. The first extension portion 77 and the fourth extension portion 80 are fixed to the holder 50, and the heat dissipation member 53 contacts the fourth extension portion 80. With this configuration, the first member 51 constituting the rotation support mechanism 15 can be integrally formed with the movable body 5.

[0062] In this example, the frame portion 57 of the holder 50 includes a second fixing hole 76 into which the fourth extension portion 80 is inserted from the Z-axis direction, and an opening 86 that is provided on the inner circumferential surface of the frame portion 57 and exposes a portion of the fourth extension portion 80 inserted into the second fixing hole 76 to the radially inward side. The exposed portion 13a of the substrate 13 faces the opening 86, and the heat dissipation member 53 contacts the fourth extension portion 80 through the opening 86. Therefore, it is easy to bring the heat dissipation member 53 into contact with both the fourth extension portion 80 of the first member 51 fixed to the holder 50 and the substrate 13 of the camera module 2.

[0063] In this example, the second magnet 83 is fixed to the first extension portion 77, and the first magnet 82 is fixed to the third extension portion 79. The first member 51 is made of a magnetic metal and functions as a yoke for the first magnet 82 and the second magnet 83. Therefore, the first member 51 constituting the rotation support mechanism 15 releases heat from the imaging element 12 and also functions as a back yoke for the magnets 82, 83. Here, in this example, in the first member 51 Thus, the fourth extension portion 80 with which the heat dissipation member 53 comes into contact is provided at an angular position different from the first extension portion 77 and the third extension portion 79 to which the magnets are fixed. Therefore, even if heat is applied to the first member 51 through the heat dissipation member 53, the transfer of this heat to the magnets 82, 83 can be prevented or suppressed.

[0064] Here, the heat dissipation member 53 may be a metal paste applied between the substrate 13 and the first member 51. In this way, the heat dissipation member 53 can be easily brought into contact with both the substrate 13 and the first member 51.

[0065] The heat dissipation member 53 may be in contact with the first extension portion 77 or the third extension portion 79 to which the magnet is fixed in the first member 51, and the substrate 13. For example, in the first member 51, the first magnet 82 may be fixed to the fourth extension portion 80 with which the heat dissipation member 53 is in contact.

[0066] (Modification) Fig. 11 is a cross-sectional view of a modified optical unit with shake correction function. In Fig. 11, the modified optical unit with shake correction function 1A is cut at a position corresponding to line CC in Fig. 3. Note that the modified optical unit with shake correction function 1A has a configuration corresponding to the above-mentioned optical unit with shake correction function 1, so only the different configuration will be described.

[0067] As shown in FIG. 11, in the optical unit 1A with shake correction function of this example, the substrate 13 of the camera module 2 includes a substrate body 98 on which the imaging element 12 is mounted, and a heat sink 99 fixed to the rear surface of the substrate body 98 in the -Z direction. The module case 55 of the camera module 2 includes two openings 55a at the end portion in the +Y direction of the bottom plate located in the -Z direction. The openings 55a are provided at two locations spaced apart in the X direction. A part of the substrate 13 is exposed from the openings 55a. In this example, a part of the heat sink 99 is exposed from the openings 55a. The part of the heat sink 99 that can be seen through the openings 55a is the exposed part 13a of the substrate 13.

[0068] Next, the first member 51 constituting a part of the movable body 5 and a part of the rotation support mechanism 15 includes a bent portion 80e in which the fourth extension portion 80 is bent radially inward from the tip of each fourth portion 80d. Here, in a state before the first member 51 is fixed to the holder 50, each bent portion 80e extends linearly in the Z-axis direction continuous with each fourth portion 80d. The bent portion 80e is bent radially inward after the fourth extension portion 80 penetrates the second fixing hole 76 when the first member 51 is fixed to the holder 50. As a result, each bent portion 80e extends to a position overlapping with the camera module 2 when viewed from the Z-axis direction. The third portion 80c and each fourth portion 80d of the fourth extension portion 80 are through portions 80f that penetrate the second fixing hole 76.

[0069] A tip portion of each bent portion 80e faces a corresponding opening 55a provided in the module case 55 in the Z-axis direction. Therefore, the tip portion of each bent portion 80e faces the exposed portion 13a of the substrate 13 through each opening 55a.

[0070] Here, the two heat dissipation members 53 are respectively installed between the camera module 2 and each bent portion 80e of the fourth extension portion 80 in the Z-axis direction. The end of each heat dissipation member 53 on the camera module 2 side contacts the exposed portion 13a of the substrate 13 through the opening 55a of the module case 55. In this example, the exposed portion 13a of the substrate 13 is a part of the heat dissipation plate 99. The end of each heat dissipation member 53 opposite to the camera module 2 contacts the respective bent portion 80e of the fourth extension portion 80.

[0071] Even in this manner, the heat dissipation member 53 can be connected to both the substrate 13 and the first member 51. Furthermore, in this way, heat from the imaging element 12 is conducted to the first member 51 via the heat sink 99 provided on the substrate 13 and the heat dissipation member 53 . [Explanation of symbols]

[0072] 1...1A...optical unit with shake correction function, 2...camera module, 2a...lens, 5...movable body, 6...support, 7...frame, 8...cover, 8a...opening, 9...base, 10...flexible printed circuit board, 11...flexible printed circuit board, 12...imaging element, 13...substrate, 13a...exposed portion, 15...rotation support mechanism, 16...swing support mechanism, 17...gimbal frame, 18...first connection mechanism, 19...second connection mechanism, 20...shake correction magnetic drive mechanism, 21...first shake correction magnetic drive mechanism, 22...second shake correction magnetic drive mechanism, 23...frame portion, 24...wiring housing portion, 25...first side plate portion, 25a...second coil fixing hole, 26...second side plate portion, 26a...notch portion, 27...third side plate portion, 27a...first coil fixing hole, 28...fourth side plate portion, 29...magnetic drive mechanism for rolling correction, 31...first coil, 32...second coil, 33...third coil, 35...gimbal frame main body portion, 35a...opening, 36...first gimbal frame extension portion, 36a...first concave curved surface, 37...second gimbal frame extension portion, 37a...second concave curved surface, 41...first gimbal frame support member, 42...first sphere, 43...first thrust support member, 45...second gimbal frame support member, 46...second sphere, 50...holder, 51...first member, 53...heat dissipation member, 55...module case, 55a...opening, 56...lens barrel, 57...frame, 61...first side wall, 62...second side wall, 63...third side wall, 64...fourth side wall, 65...fifth side wall, 66...sixth side wall, 67...seventh side wall, 68...eighth side wall, 70...first annular plate portion, 70a...through hole, 70b...first annular groove, 71...first recess, 72...first fixing hole, 73...notch portion, 74...second recess, 75...third recess, 76...second fixing hole, 76a...first hole portion, 76b...second hole portion, 77...first extension portion, 77a...wide portion, 78...first 2 extension portion, 79...third extension portion, 80...fourth extension portion, 80a...first portion, 80b...second portion, 80c...third portion, 80d...fourth portion, 80e...bent portion, 80f...through portion, 82...first magnet, 83...second magnet, 84...third magnet, 85...metal plate, 86...opening, 87...second member, 88...rotation mechanism, 89...first protruding plate portion, 90...second annular plate portion, 91...extension portion, 91a...first portion, 91b...second portion, 92...second protruding plate portion, 93...second annular groove, 94...rolling body, 95...retainer, 96...pressurizing mechanism, 97...pressurizing magnet, 98...substrate body, 99...heat sink,R1... the first axis, R2... the second axis,

Claims

1. a movable body including a camera module and a holder for holding the camera module; a rotation support mechanism that supports the movable body so that the movable body can rotate around an optical axis of the camera module; a swing support mechanism that supports the rotation support mechanism rotatably about a first axis that intersects with the optical axis, and that supports the rotation support mechanism rotatably about a second axis that intersects with the optical axis and the first axis; and a support body that supports the movable body via the swing support mechanism and the rotation support mechanism, the camera module includes an imaging element, a substrate on which the imaging element is mounted, and a case that houses the imaging element and the substrate; the rotation support mechanism includes a first member fixed to the holder, a second member supported by the swing support mechanism so as to be rotatable about the first axis, and a rotation mechanism that enables the first member and the second member to rotate relatively about the optical axis, the first member is made of metal, the substrate has an exposed portion that is exposed to the outside from the case, the movable body includes a heat dissipation member in contact with the exposed portion of the substrate and the first member, 2. An optical unit with a shake correction function, wherein heat from the image sensor is conducted from the substrate to the first member via the heat dissipation member.

2. 2. The optical unit with shake correction function according to claim 1, wherein the heat dissipation member is a metal paste applied between the substrate and the first member.

3. 2. The optical unit with shake correction function according to claim 1, wherein the heat dissipation member is a metal member disposed between the substrate and the first member and in contact with the substrate and the holder.

4. the holder includes a frame portion that surrounds the camera module from a radially outer side, the first member includes a first annular plate portion that surrounds the optical axis and overlaps with the camera module when viewed from the optical axis direction, and an extension portion that is located radially outward of the camera module, the second member includes a second annular plate portion facing the first annular plate portion in the optical axis direction and disposed between the first annular plate portion and the camera module in the optical axis direction, the rotation mechanism includes a first annular groove provided in a first annular plate portion, a second annular groove provided in the second annular plate portion and facing the first annular groove in the optical axis direction, and a plurality of rolling elements inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion, The extension portion is fixed to the holder, 4. The optical unit with shake correction function according to claim 1, wherein the heat dissipation member is in contact with the extension portion.

5. the frame portion includes a fixing hole into which the extension portion is inserted from the optical axis direction, and an opening portion provided on an inner peripheral surface of the frame portion and exposing a portion of the extension portion inserted into the fixing hole to a radially inner side, the exposed portion of the substrate faces the opening; 5. The optical unit with shake correction function according to claim 4, wherein the heat dissipation member contacts the extension portion through the opening.

6. The frame portion includes a fixing hole penetrating in the optical axis direction, the extension portion includes a through portion that passes through the fixing hole, and a bent portion that is bent radially inward from an end of the through portion opposite to the first annular plate portion and overlaps with the camera module when viewed from the optical axis direction, the exposed portion of the substrate faces the bent portion, 5. The optical unit with shake correction function according to claim 4, wherein the heat dissipation member is in contact with the bent portion.

7. a shake correction magnetic drive mechanism that rotates the movable body about the first axis or the second axis, The support body includes a support body side frame portion that surrounds the holder from the radially outer side, the shake correction magnetic drive mechanism includes a drive coil fixed to the support body side frame portion, and a drive magnet held by the movable body and facing the drive coil, the first member includes a second extension portion located radially outward of the camera module at an angular position around the optical axis different from that of the extension portion, The drive magnet is fixed to the second extension portion, 7. The optical unit with shake correction function according to claim 4, wherein the second extension portion is fixed to the holder and is located on an opposite side of the drive magnet to the drive coil.

8. the substrate includes a substrate body on which the imaging element is mounted, and a heat sink fixed to the substrate body; 8. The optical unit with shake correction function according to claim 1, wherein the heat dissipation member is in contact with the heat dissipation plate.

Images