Optical unit with image stabilization function

Abstract

The objective is to provide an optical unit with a vibration correction function that can stabilize the orientation of the movable body in the optical axis direction, even when the movable body and the first intermediate member are connected by a first leaf spring in the optical axis direction. [Solution] The optical unit comprises a movable body having a holder for holding a camera module, a rotational support mechanism that rotatably supports the movable body, a rocking support mechanism that rocksly supports the rotational support mechanism, and a pressurizing mechanism that generates a magnetic attractive force in the optical axis direction. The rotational support mechanism comprises a first frame fixed to the object side of the holder, a second frame positioned on the image side of the holder and supported by the rocking support mechanism so as to be rotatable around a first axis, a flat plate-shaped first leaf spring connecting the first frame and the second frame in the optical axis direction, and a plurality of rolling elements that roll between the holder and the second frame.

Description

Technical Field

[0001] The present invention relates to an optical unit with a shake correction function.

Background Art

[0002] Among the optical units mounted on mobile terminals and moving bodies, in order to suppress the blurring of captured images when the mobile terminal or moving body moves, there are some equipped with a mechanism that swings or rotates a movable body on which an optical module is mounted to correct shake. Patent Document 1 discloses this type of optical unit with a shake correction function.

[0003] The optical unit with a shake correction function of Patent Document 1 includes a movable body having a camera module, a first intermediate member that rotatably holds the movable body, a second intermediate member that rotatably holds the first intermediate member, a fixed body that rotatably holds the second intermediate member, a first rotation mechanism that rotates the movable body with respect to the first intermediate member around the optical axis of the camera module, a second rotation mechanism that rotates the movable body with respect to the fixed body, and a plurality of spring portions that connect the movable body and the first intermediate member. The spring portion includes a flat plate-shaped first leaf spring that can be elastically deformed in the rotation direction of the movable body with respect to the first intermediate member. The first leaf spring connects the movable body and the first intermediate member in the optical axis direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the optical unit with shake correction function described in Patent Document 1, the first leaf spring connects the movable body and the first intermediate member in the optical axis direction. As a result, the movable body is floating relative to the first intermediate member, and the first leaf spring also undergoes elastic deformation in the optical axis direction. This leads to the problem that the posture of the movable body in the optical axis direction is difficult to stabilize.

[0006] In view of the above problems, the object of the present invention is to provide an optical unit with a vibration correction function that can stabilize the attitude of the movable body in the optical axis direction, even when the movable body and the first intermediate member are connected by a first leaf spring in the optical axis direction. [Means for solving the problem]

[0007] To solve the above problems, one embodiment of the optical unit with shake correction function according to the present invention comprises a movable body having a camera module and a frame-shaped holder for holding the camera module, A rotational support mechanism that rotatably supports the movable body around the optical axis of the camera module, A rocking support mechanism rotatably supports the rotation support mechanism around a first axis intersecting the optical axis, and rotatably supports the rotation support mechanism around a second axis intersecting the optical axis and the first axis, A fixed body that supports the movable body via the aforementioned rocking support mechanism, A magnetic drive mechanism for oscillation that generates a magnetic force to cause the movable body to oscillate relative to the fixed body, A rotational magnetic drive mechanism that generates a magnetic force to rotate the movable body relative to the fixed body with respect to the optical axis, A pressurizing mechanism that generates a magnetic attractive force in the optical axis direction along the optical axis, Equipped with, If one side in the optical axis direction is considered the object side and the other side is considered the image side, The rotation support mechanism comprises: a first frame fixed to either the object side or the image side of the holder; a second frame disposed on the other side of the holder and rotatably supported by the rocking support mechanism around the first axis; a first plate-shaped leaf spring connecting the first frame and the second frame in the optical axis direction and elastically deformable around the optical axis; and a plurality of rolling elements rolling between the holder and the second frame. The pre-pressure mechanism comprises a pre-pressure magnet disposed on either the holder or the second frame, and a magnetic body disposed on the other of the holder or the second frame and attracted to the pre-pressure magnet. The rolling element is characterized in that it is sandwiched in the optical axis direction between the holder and the second frame by the magnetic attractive force generated by the pressurization mechanism. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the optical unit in this embodiment. [Figure 2] Figure 2 is a perspective view of the optical unit in this embodiment with the first cover removed. [Figure 3] Figure 3 is an exploded perspective view of Figure 1. [Figure 4] Figure 4 is an exploded perspective view of the rotational support mechanism and the rocking support mechanism. [Figure 5] Figure 5 is an exploded perspective view of the rotation support mechanism as seen from the object side. [Figure 6] Figure 6 is an exploded perspective view of the rotation support mechanism as seen from the image side. [Figure 7] Figure 7 is a plan view of the case. [Figure 8] Figure 8 is a plan view of the second frame. [Figure 9] Figure 9 is a diagram illustrating the first leaf spring. [Figure 10] Figure 10 is a cross-sectional view of AA in Figure 4. [Figure 11] Figure 11 illustrates the first spring in a modified example.

Embodiment for Carrying out the Invention

[0009] 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.

[0010] FIG. 1 is a perspective view of the optical unit of this embodiment. FIG. 2 is a perspective view of the state where the first cover is removed from the optical unit of this embodiment. FIG. 3 is an exploded perspective view of FIG. 1. FIG. 4 is an exploded perspective view of the rotation support mechanism and the swing support mechanism. FIG. 5 is an exploded perspective view of the rotation support mechanism as viewed from the object side. FIG. 6 is an exploded perspective view of the rotation support mechanism as viewed from the image side. FIG. 7 is a plan view of the case. FIG. 8 is a plan view of the second frame. FIG. 9 is a view for explaining the first leaf spring. FIG. 10 is a cross-sectional view taken along the line A-A of FIG. 4.

[0011] As shown in FIG. 1, the optical unit 100 (optical unit with a shake correction function) includes a camera module 16. The optical unit 100 is used, for example, in optical devices such as a mobile phone with a camera, a drive recorder, etc., and in optical devices such as an action camera or a wearable camera mounted on a moving body such as a helmet, a bicycle, a radio control helicopter, etc. In such an optical device, when shake of the optical device occurs during shooting, the captured image is disturbed. The optical unit 100 corrects the inclination of the camera module 16 based on the acceleration, angular velocity, shake amount, etc. detected by detection means such as a gyroscope in order to avoid the captured image from tilting.

[0012] As shown in FIG. 2, the optical unit 100 rotates the camera module 16 around a first axis R1 orthogonal to the optical axis L of the camera module 16, and rotates the camera module 16 around a second axis R2 orthogonal to the optical axis L and the first axis R1 to perform shake correction. Also, the optical unit 100 rotates the camera module 16 around the optical axis L to perform shake correction. The optical unit 100 of this embodiment performs pitching correction, yawing correction, and roll correction.

[0013] In the following description, three axes orthogonal to each other are defined as the X-axis, Y-axis, and Z-axis. The Z-axis coincides with the optical axis L. In the Z-axis direction, the Z1 direction is one direction of the optical axis direction and is the object side of the camera module 16, and the Z2 direction is the other direction of the optical axis direction and is the image side of the camera module 16. When the plane including the X-axis and the Y-axis is defined as the XY plane, the first axis R1 and the second axis R2 are located on the XY plane. The first axis R1 and the second axis R2 are inclined at 45 degrees with respect to the X-axis and the Y-axis.

[0014] As shown in FIGS. 2 and 3, the optical unit 100 includes a movable body 2 including a camera module 16, a rotation support mechanism 3 that rotatably supports the movable body 2 about the optical axis L, a swing support mechanism 4 that swingably supports the rotation support mechanism 3, a swing magnetic drive mechanism 5 that generates a magnetic force for swinging the movable body 2, a rotation magnetic drive mechanism 6 that generates a magnetic force for rotating the movable body 2, a pressure application mechanism 7 that generates a magnetic attraction force in the optical axis direction, a fixed body 8 that supports the movable body 2 via the swing support mechanism 4, and flexible printed boards 14 and 15.

[0015] As shown in FIG. 3, the camera module 16 includes a lens barrel 161 that holds a lens, a rectangular main body portion 162 that holds the lens barrel 161, and a substrate 163 on which an image pickup device is mounted. A flexible printed board 14 is electrically connected to the substrate 163.

[0016] As shown in FIGS. 3 to 6, the movable body 2 includes a camera module 16 and a frame-shaped holder 20 that holds the camera module 16 inside. As shown in FIG. 2, the lens barrel 161 protrudes in the Z1 direction from the center of the holder 20. The holder 20 is made of resin. The holder 20 includes a first side wall portion 21 and a second side wall portion 22 arranged in the X-axis direction, and a third side wall portion 23 and a fourth side wall portion 24 arranged in the Y-axis direction. The second side wall portion 22 is located in the X2 direction of the first side wall portion 21. The fourth side wall portion 24 is located in the Y2 direction of the third side wall portion 23.

[0017] The first end face 27 of the holder 20 in the Z1 direction is provided with a first projection 25 that protrudes from the first end face 27 in the Z1 direction. Two first projections 25 are provided in the center of each of the four sides of the first end face 27. The second end face 28 of the holder 20 in the Z2 direction is provided with a second projection 26 that protrudes from the second end face 28 in the Z2 direction. The second projections 26 are formed near each of the four corners of the holder 20.

[0018] As shown in Figure 3, the fixed body 8 comprises a rectangular case 9 surrounding the outer circumference of the movable body 2, a first cover 10 covering the case 9 from the Z1 direction, and a second cover 11 covering the case 9 from the Z2 direction. The case 9 is made of resin. The case 9 comprises a first side wall portion 91 and a second side wall portion 92 aligned in the X-axis direction, and a third side wall portion 93 and a fourth side wall portion 94 aligned in the Y-axis direction. The second side wall portion 92 is located in the X2 direction of the first side wall portion 91. The first cover 10 and the second cover 11 are made of metal. As shown in Figure 1, the lens barrel 161 is exposed from the central opening of the first cover 10.

[0019] As shown in Figures 2 and 4, the rocking support mechanism 4 supports the rotation support mechanism 3 so that it can rotate around a first axis R1, and also supports the rotation support mechanism 3 so that it can rotate around a second axis R2. As shown in Figure 4, the rocking support mechanism 4 comprises a gimbal frame 41, a first connecting part 42, and a second connecting part 43. The gimbal frame 41 is made of a metal leaf spring. The gimbal frame 41 comprises a frame-shaped main body 411, a pair of first arms 412 extending in the Z2 direction on both sides of the main body 411 in the first axial direction along the first axis R1, and a pair of second arms 415 extending in the Z2 direction on both sides of the main body 411 in the second axial direction along the first axis R1. It is equipped with.

[0020] The main body 411 is located in the Z1 direction of the movable body 2. The lens barrel 161 is exposed through an opening in the center of the main body 411. A recess 413 is formed at the tip of the first arm 412, recessed radially inward around the optical axis L. A recess 416 is formed at the tip of the second arm 415, recessed radially inward around the optical axis L.

[0021] The first connecting portion 42 is made of metal. As shown in Figures 4, 5, and 8, two first connecting portions 42 are provided, connecting the movable body 2 and the first arm 412 so that they can rotate around the first axis R1. As shown in Figures 5 and 8, the first connecting portion 42 is fixed to the first bent portion 362 located at the first axial corner of the second frame 32. The first connecting portion 42 has a projection 421 that protrudes radially inward. The projection 421 fits into a recess 413. As a result, the first arm 412 is rotatably supported by the projection 421.

[0022] The second connecting portion 43 is made of metal. As shown in Figures 4 and 7, two second connecting portions 43 are provided, connecting the fixed body 8 and the second arm 415 so that they can rotate around the second axis R2. As shown in Figure 7, the second connecting portion 43 is held in a retaining portion 98 formed in the inner corner of the case 9 in the second axial direction. The second connecting portion 43 has a projection 431 that protrudes radially inward. The projection 431 is rotatably supported in a recess 416. As a result, the second arm 415 is rotatably supported by the projection 431.

[0023] As shown in Figures 4 to 6, the rotation support mechanism 3 includes a first frame 31 fixed to the holder 20 in the Z1 direction, a second frame 32 positioned in the Z2 direction of the holder 20 and supported by the rocking support mechanism 4 so as to be rotatable around a first axis R1, a flat plate-shaped first leaf spring 33 connecting the first frame 31 and the second frame 32 in the optical axis direction and elastically deformable around the optical axis L, a restricting frame 34 positioned in the Z1 direction of the movable body 2 such that a gap is formed between the movable body 2 and the movable body 2 in the optical axis direction, a plurality of rolling elements 38 sandwiched between the holder 20 and the second frame 32 in the optical axis direction and rolling between the holder 20 and the second frame 32, and a restricting part 39 for restricting the range of motion of the movable body 2 in a plane perpendicular to the optical axis L with respect to the second frame 32.

[0024] As shown in Figures 5 and 6, the first frame 31 includes a flat plate portion 35 fixed to the first end face 27 of the holder 20 in the Z1 direction. The first plate portion 35 is made of a metal leaf spring. The first plate portion 35 includes a rectangular frame portion 351 and spring holding portions 352 protruding from both sides of the frame portion 351 in the first axial direction and the second axial direction. The frame portion 351 is fixed to the first end face 27 of the holder 20 with adhesive or the like. Four spring holding portions 352 are provided at 90° intervals around the optical axis L. The spring holding portions 352 hold the end of the first leaf spring 33 in the Z1 direction. Note that the spring holding portions 352 correspond to the second leaf spring of the present invention.

[0025] As shown in Figures 5 and 6, the second frame 32 comprises a second flat plate portion 37 positioned in the Z2 direction of the holder 20, and a support frame 36 positioned in the Z2 direction of the second flat plate portion 37. The second flat plate portion 37 is made of a metal leaf spring. The second flat plate portion 37 comprises a rectangular frame portion 371 and spring holding portions 372 protruding from both sides of the frame portion 371 in the first axial direction and the second axial direction. The frame portion 371 is fixed to the Z1 direction surface of the support frame 36 with adhesive or the like. Four spring holding portions 372 are provided at 90° intervals centered on the optical axis L. The spring holding portions 372 hold the Z2 direction end of the first leaf spring 33. Note that the spring holding portions 372 correspond to the second leaf spring of the present invention.

[0026] The support frame 36 consists of a magnetic metal plate member. As shown in Figures 5 and 6. The support frame 36 comprises a rectangular frame portion 361, first bent portions 362 bent in the Z1 direction from both sides in the first axial direction of the frame portion 361, and second bent portions 363 bent in the Z1 direction from both sides in the second axial direction of the frame portion 361. Second notches 364 corresponding to the second projections 26 are formed near the four corners of the frame portion 361. As shown in Figures 5 and 8, a first connecting portion 42 is fixed to the outer circumferential surface of the first bent portion 362 by welding.

[0027] The first leaf spring 33 is made of metal. As shown in Figures 4 to 6, the first leaf spring 33 is a flat plate with its thickness in a predetermined direction perpendicular to the optical axis L. Four first leaf springs 33 are provided at 90° intervals centered on the optical axis L. As shown in Figure 9, the first leaf spring 33 comprises a first connecting portion 331 arranged in the Z1 direction, a second connecting portion 332 arranged in the Z2 direction, and a meandering portion 333 that has one end connected to the first connecting portion 331 and the other end connected to the second connecting portion 332, and extends in the direction of the optical axis while meandering.

[0028] The first connecting portion 331 is fixed to the spring holding portion 352 by welding or the like, while being sandwiched in a slit formed in the spring holding portion 352. The second connecting portion 332 is fixed to the spring holding portion 372 by welding or the like, while being sandwiched in a slit formed in the spring holding portion 372. The meandering portion 333 meanders back and forth in a direction perpendicular to the optical axis L. The meandering portion 333 comprises a plurality of straight portions 334 extending linearly in a direction perpendicular to the optical axis L, and arc portions 335 connecting the ends of adjacent straight portions 334.

[0029] The restricting frame 34 is made of a non-magnetic metal plate member. As shown in Figures 4 to 6, the restricting frame 34 has a first notch 341 formed in the center of each of its four sides. Each corner 342 of the restricting frame 34 is fixed to the tip of the first bent portion 362 and the second bent portion 363 by welding or the like. Here, when the holder 20 of the movable body 2 moves in the Z1 direction, it comes into contact with the restricting frame 34, thereby restricting the range of motion of the movable body 2 in the Z1 direction. As a result, even if an impact is applied to the optical unit 100 in the direction of the optical axis and the movable body 2 moves in the Z1 direction relative to the second frame 32, plastic deformation of the first leaf spring 33 and the spring holding portions 352 and 372 is suppressed.

[0030] The rolling elements 38 are metal balls. As shown in Figures 5, 6, and 10, there are three rolling elements 38. The three rolling elements 38 are arranged at approximately equal angular intervals around the optical axis L. The rolling elements 38 are housed in a ball housing portion 29 formed on the second end face 28 of the holder 20. The ball housing portion 29 is an elongated hole extending along the holder 20.

[0031] The restricting portion 39 is composed of a first projection 25 and a second projection 26, and a first notch 341 and a second notch 364. When the first projection 25 and the second projection 26 move in a direction perpendicular to the optical axis L, they come into contact with the first notch 341 and the second notch 364, thereby restricting the range of motion of the movable body 2 relative to the second frame 32. As a result, even if an impact perpendicular to the optical axis L is applied to the optical unit 100 and the movable body 2 moves in a direction perpendicular to the optical axis L relative to the second frame 32, plastic deformation of the first leaf spring 33 is suppressed.

[0032] The oscillating magnetic drive mechanism 5 generates a magnetic force that causes the movable body 2 to oscillate relative to the fixed body 8 so that the optical axis L tilts in any direction. As shown in Figures 3 to 6, the oscillating magnetic drive mechanism 5 comprises a first oscillating magnet 51 fixed to the first side wall portion 91 of the holder 20, a first oscillating coil 52 fixed to the fixed body 8 and facing the first oscillating magnet 51, a second oscillating magnet 53 fixed to the third side wall portion 93 of the holder 20, and a second oscillating coil 54 fixed to the fixed body 8 and facing the second oscillating magnet 53.

[0033] The first oscillating magnet 51 is fixed in a recess 201 that is recessed on the inside of the first side wall portion 91. The second oscillating magnet 53 is fixed in a recess 202 recessed on the inside of the third side wall 93. The first oscillating coil 52 is fixed in a coil fixing hole 95 that penetrates the first side wall 91 of the case 9. The second oscillating coil 54 is fixed in a coil fixing hole 96 that penetrates the third side wall 93 of the case 9. A magnetic plate member 171 is placed between the first oscillating magnet 51 and the first oscillating coil 52. The plate member 171 is fixed to the inner surface of the first side wall 91. Also, a magnetic plate member 172 is placed between the second oscillating magnet 53 and the second oscillating coil 54. The plate member 172 is fixed to the inner surface of the third side wall 93.

[0034] As shown in Figures 3 to 6, the rotating magnetic drive mechanism 6 comprises a rotating magnet 61 fixed to the second side wall 92 of the holder 20, and a rotating coil 62 fixed to the stationary body 8 and facing the rotating magnet 61. The rotating magnet 61 is fixed to a recess 203 recessed inward of the second side wall 92. The rotating coil 62 is fixed to a coil fixing hole 97 that penetrates the second side wall 92 of the case 9.

[0035] The first oscillating coil 52, the second oscillating coil 54, and the rotating coil 62 are electrically connected to the flexible printed circuit board 15. The flexible printed circuit board 15 is fixed to the outer surface of the case 9. Here, as shown in Figure 3, magnetic plate members 181 and 182 are fixed to the flexible printed circuit board 15. Plate member 181 is fixed to the side opposite to the side to which the first oscillating coil 52 is fixed. Plate member 182 is fixed to the side opposite to the side to which the second oscillating coil 54 is fixed. The magnetic attractive force generated between the first oscillating magnet 51 and plate member 181, and the magnetic attractive force generated between the second oscillating magnet 53 and plate member 182, positions the movable body 2 at a predetermined reference position relative to the fixed body 8. That is, the plate members 181 and 182 perform the function of maintaining the posture of the movable body 2 when no current is supplied to the first oscillating coil 52 and the second oscillating coil 54.

[0036] As shown in Figures 5 and 6, the preloading mechanism 7 comprises a first oscillating magnet 51, a second oscillating magnet 53, and a rotating magnet 61, which are preloading magnets arranged on the holder 20, and a support frame 36, which is a magnetic body arranged on the second frame. The support frame 36 is magnetically attracted to the first oscillating magnet 51, the second oscillating magnet 53, and the rotating magnet 61. As a result, as shown in Figure 10, the rolling elements 38 are sandwiched between the holder 20 and the second flat plate portion 37 by the magnetic attractive force generated by the preloading mechanism 7. When the movable body 2 rotates around the optical axis L, the three rolling elements 38 roll between the holder 20 and the second flat plate portion 37. Here, the longitudinal dimension of the ball housing portion 29 is such that the rolling elements 38 do not come into contact with it in the range of motion in the plane perpendicular to the optical axis L of the movable body 2.

[0037] (Effects and Benefits) In this embodiment of the optical unit 100, the movable body 2 is pressed against the second frame 32 via the rolling element 38 by the magnetic attraction force of the pre-pressure mechanism 7. As a result, the movable body 2 is supported in the optical axis direction by the rolling element 38, so the first leaf spring 33 is less likely to bend in the optical axis direction, and the posture of the movable body 2 in the optical axis direction is stable. In addition, because the movable body 2 is supported by the rolling element 38, the movable body 2 can easily rotate around the optical axis L relative to the second frame 32.

[0038] The oscillating magnetic drive mechanism 5 comprises a first oscillating magnet 51 fixed to the holder 20, a first oscillating coil 52 fixed to the case 9 and radially opposite to the first oscillating magnet 51, a second oscillating magnet 53 fixed to the holder 20, and a second oscillating coil 54 fixed to the case 9 and radially opposite to the second oscillating magnet 53. The rotating magnetic drive mechanism 6 comprises a rotating magnet 61 fixed to the holder 20, and a rotating coil 62 fixed to the case 9 and radially opposite to the rotating magnet 61. The pre-pressure magnet comprises the first oscillating magnet 51, the second oscillating magnet 53 and The rotating magnet 61 is a magnetic material, and the support frame 36 is fixed to the second frame 32. As a result, the first oscillating magnet 51, the second oscillating magnet 53, and the rotating magnet 61 are used as pre-pressurizing magnets, which reduces the component cost of the optical unit 100 compared to the case where pre-pressurizing magnets are provided separately.

[0039] Four first leaf springs 33 are provided at 90° intervals around the optical axis L. Each first leaf spring 33 comprises a first connecting portion 331 located on the object side, a second connecting portion 332 located on the image side, and a meandering portion 333 that is connected at one end to the first connecting portion 331 and at the other end to the second connecting portion 332, and extends in the direction of the optical axis while meandering. As a result, since four first leaf springs 33 are provided at 90° intervals around the optical axis L, the movable body 2 can rotate stably around the optical axis L. In addition, because each first leaf spring 33 has a meandering portion 333, it is easy for each first leaf spring 33 to undergo stably elastic deformation around the optical axis L.

[0040] The first frame 31 includes a flat plate portion 35 fixed to the first end face 27 of the movable body 2 in the Z1 direction. The second frame 32 includes a flat plate portion 37 positioned in the Z2 direction of the movable body 2. The first leaf spring 33 connects the first leaf portion 35 and the second leaf portion 37. The first leaf portion 35 and the second leaf portion 37 are provided with spring retaining portions 352 and 372 in the portion connecting to the first leaf spring 33, which act as a second leaf spring that is elastically deformable in the optical axis direction. As a result, when the movable body 2 moves in the optical axis direction, the spring retaining portions 352 and 372 elastically deform in the optical axis direction, thereby preventing excessive load from being placed on the first leaf spring 33.

[0041] The rotation support mechanism 3 includes a restricting frame 34 positioned such that a gap is formed between the movable body 2 and the movable body in the optical axis direction in the Z1 direction. When the movable body 2 moves in the Z1 direction, it comes into contact with the restricting frame 34, thereby restricting its range of motion in the Z1 direction. As a result, even if the optical unit 100 is subjected to an impact, plastic deformation of the first leaf spring 33 and spring retaining parts 352, 372 in the optical axis direction can be suppressed.

[0042] The rotation support mechanism 3 includes a restricting portion 39 for restricting the range of motion of the movable body 2 in a plane perpendicular to the optical axis L with respect to the second frame 32. The restricting portion 39 includes a first projection 25 protruding from the holder toward the restricting frame 34, and a first notch 341 formed on the restricting frame 34, toward which the first projection 25 makes contact when the first projection 25 moves in a direction perpendicular to the optical axis L. This makes it possible to suppress plastic deformation of the first leaf spring 33 and spring retaining portions 352, 372 in a direction perpendicular to the optical axis L even if an impact is applied to the optical unit 100.

[0043] The restricting portion 39 includes a second projection 26 that protrudes from the holder 20 toward the second frame 32, and a second notch 364 formed on the support frame 36 of the second frame 32, which the second projection 26 contacts when it moves in a direction perpendicular to the optical axis L. This makes it possible to suppress plastic deformation of the first leaf spring 33 and spring retaining portions 352, 372 in the direction perpendicular to the optical axis L even if the optical unit 100 is subjected to an impact.

[0044] (First spring of the modification) Figure 11 illustrates a modified first leaf spring 33A. As shown in Figure 11, the modified first leaf spring 33A comprises a first connecting portion 331 arranged in the Z1 direction, a second connecting portion 332 arranged in the Z2 direction, and a meandering portion 333 that is connected at one end to the first connecting portion 331 and at the other end to the second connecting portion 332, and extends in the direction of the optical axis while meandering. The first connecting portion 331 is fixed to the spring holding portion 352 by welding or the like, while being sandwiched in a slit formed in the spring holding portion 352. The second connecting portion 332 is fixed to the spring holding portion 372 by welding or the like, while being sandwiched in a slit formed in the spring holding portion 372. The meandering portion 333 meanders back and forth in the direction of the optical axis. It comprises multiple linear portions 334 extending linearly in the direction and arc portions 335 connecting the ends of adjacent linear portions 334. As a result, the linear portions 334 extend linearly in the direction of the optical axis, making it easier for the movable body 2 to rotate around the optical axis L.

[0045] (Other embodiments) In the above embodiment, a first oscillating magnet 51, a second oscillating magnet 53, and a rotating magnet 61 were used as the pre-pressurizing magnets. However, in other embodiments, a separate pre-pressurizing magnet may be provided in the holder 20. Alternatively, the pre-pressurizing magnet may be arranged in the second frame, and the magnetic material may be arranged in the holder 20.

[0046] In other embodiments, only one of the first flat plate portion 35 and the second flat plate portion 37 may be provided with a spring retaining portion that forms the second leaf spring. Also, in other embodiments, the first flat plate portion 35 and the second flat plate portion 37 may not be provided with a spring retaining portion that forms the second leaf spring.

[0047] Furthermore, this technology can be configured as follows:

[0048] (1) A movable body comprising a camera module and a frame-shaped holder for holding the camera module, A rotational support mechanism that rotatably supports the movable body around the optical axis of the camera module, A rocking support mechanism rotatably supports the rotation support mechanism around a first axis intersecting the optical axis, and rotatably supports the rotation support mechanism around a second axis intersecting the optical axis and the first axis, A fixed body that supports the movable body via the aforementioned rocking support mechanism, A magnetic drive mechanism for oscillation that generates a magnetic force to cause the movable body to oscillate relative to the fixed body, A rotational magnetic drive mechanism that generates a magnetic force to rotate the movable body relative to the fixed body with respect to the optical axis, A pressurizing mechanism that generates a magnetic attractive force in the optical axis direction along the optical axis, Equipped with, If one side in the optical axis direction is considered the object side and the other side is considered the image side, The rotation support mechanism comprises: a first frame fixed to either the object side or the image side of the holder; a second frame disposed on the other side of the holder and rotatably supported by the rocking support mechanism around the first axis; a first plate-shaped leaf spring connecting the first frame and the second frame in the optical axis direction and elastically deformable around the optical axis; and a plurality of rolling elements rolling between the holder and the second frame. The pre-pressure mechanism comprises a pre-pressure magnet disposed on either the holder or the second frame, and a magnetic body disposed on the other of the holder or the second frame and attracted to the pre-pressure magnet. The optical unit with a vibration correction function is characterized in that the rolling elements are sandwiched in the optical axis direction between the holder and the second frame by the magnetic attractive force generated by the pressurization mechanism.

[0049] (2) The aforementioned magnetic drive mechanism for oscillation comprises an oscillation magnet fixed to the holder and an oscillation coil fixed to the fixed body and facing radially opposite the oscillation magnet. The aforementioned magnetic drive mechanism for rotation comprises a rotating magnet fixed to the holder and a rotating coil fixed to the stationary body and facing the rotating magnet in the radial direction. The pressurizing magnet is at least one of the oscillating magnet or the rotating magnet. The optical unit with vibration correction function according to (1), characterized in that the magnetic material is fixed to the second frame.

[0050] (3) The first leaf spring is provided in four units at 90° intervals around the optical axis. The optical unit with shake correction function according to (1) or (2), characterized in that the first leaf spring comprises a first connecting portion disposed on the object side, a second connecting portion disposed on the image side, and a meandering portion that has one end connected to the first connecting portion and the other end connected to the second connecting portion and extends in the direction of the optical axis while meandering.

[0051] (4) The first frame comprises a flat plate portion fixed to one side of the movable body, either the object side or the image side. The second frame comprises a flat plate-shaped second plate portion positioned on the other side of the movable body, either on the object side or the image side. The first leaf spring connects the first flat plate portion and the second flat plate portion, The optical unit with shake correction function according to any one of (1) to (3), characterized in that at least one of the first flat plate portion or the second flat plate portion is provided with a second leaf spring that is elastically deformable in the optical axis direction at the portion connected to the first spring.

[0052] (5) The rotation support mechanism includes a restricting frame positioned such that a gap is formed between the movable body and the optical axis on either the object side or the image side of the movable body. The optical unit with shake correction function according to any one of (1) to (4), characterized in that when the movable body moves to either the object side or the image side, it comes into contact with the restricting frame, thereby restricting the range of motion on either the object side or the image side.

[0053] (6) The optical unit with shake correction function according to (5), characterized in that the rotation support mechanism includes a restricting part for restricting the range of motion of the movable body in a plane perpendicular to the optical axis with respect to the second frame.

[0054] (7) The optical unit with shake correction function according to (6), characterized in that the restricting portion comprises a first projection protruding from the holder toward the restricting frame and a first notch formed in the restricting frame toward which the first projection contacts when the first projection moves in a direction perpendicular to the optical axis.

[0055] (8) The optical unit with shake correction function according to (6) or (7), characterized in that the restricting portion comprises a second projection protruding from the holder toward the second frame, and a second notch formed on the second frame, toward which the second projection contacts when the second projection moves in a direction perpendicular to the optical axis. [Explanation of Symbols]

[0056] 100…Optical unit, 2…Movable body, 3…Rotation support mechanism, 4…Oscillating support mechanism, 5…Magnetic drive mechanism for oscillation, 6…Magnetic drive mechanism for rotation, 7…Pressure mechanism, 8…Fixed body, 9…Case, 10…First cover, 11…Second cover, 14…Flexible printed circuit board, 15…Flexible Printed circuit board, 16...Camera module, 20...Holder, 21...First side wall, 22...Second side wall, 23...Third side wall, 24...Fourth side wall, 25...First projection, 26...Second projection, 27...First end face, 28...Second end face, 29...Ball housing, 31...First frame, 32...Second frame, 33·33A...First leaf spring, 34...Regulating frame, 35...First 36... Flat plate section, 37... Support frame, 38... Second flat plate section, 39... Rolling element, 41... Regulating section, 42... First connection section, 43... Second connection section, 51... First oscillating magnet, 52... First oscillating coil, 53... Second oscillating magnet, 54... Second oscillating coil, 61... Rotating magnet, 62... Rotating coil, 91... First side wall section, 92... Second side wall section, 93... Third Side wall section, 94...Fourth side wall section, 95, 96, 97...Coil fixing hole, 98...Holding section, 161...Lens barrel, 162...Main body section, 163...Base plate, 171, 172...Plate members, 181, 182...Plate members, 201, 202, 203...Recessed section, 331...First connection section, 332...Second connection section, 333...Meandering section, 334...Straight section, 335...Arc section, 341...First notch section 342...corner section, 351...frame section, 352...spring holder section, 361...frame section, 362...first bend section, 363...second bend section, 364...second notch section, 371...frame section, 372...spring holder section, 411...main body section, 412...first arm, 413...recess, 415...second arm, 416...recess, 421...projection section, 431...projection section, L...optical axis, R1...first axis, R2...second axis.

Claims

1. A movable body comprising a camera module and a frame-shaped holder for holding the camera module, A rotational support mechanism that rotatably supports the movable body around the optical axis of the camera module, A rocking support mechanism rotatably supports the rotation support mechanism around a first axis intersecting the optical axis, and rotatably supports the rotation support mechanism around a second axis intersecting the optical axis and the first axis, A fixed body that supports the movable body via the aforementioned rocking support mechanism, A magnetic drive mechanism for oscillation that generates a magnetic force to cause the movable body to oscillate relative to the fixed body, A rotational magnetic drive mechanism that generates a magnetic force to rotate the movable body relative to the fixed body with respect to the optical axis, A pressurizing mechanism that generates a magnetic attractive force in the optical axis direction along the optical axis, Equipped with, If one side in the optical axis direction is considered the object side and the other side is considered the image side, The rotation support mechanism comprises a first frame fixed to either the object side or the image side of the holder; a second frame disposed on the other side of the holder and rotatably supported by the rocking support mechanism around the first axis; a first plate-shaped leaf spring connecting the first frame and the second frame in the optical axis direction and elastically deformable around the optical axis; and a plurality of rolling elements rolling between the holder and the second frame. The pressurizing mechanism comprises a pressurizing magnet disposed on either the holder or the second frame, and a magnetic body disposed on the other of the holder or the second frame and attracted to the pressurizing magnet. The optical unit with a vibration correction function is characterized in that the rolling elements are sandwiched in the optical axis direction between the holder and the second frame by the magnetic attractive force generated by the pressurization mechanism.

2. The aforementioned magnetic drive mechanism for oscillation comprises an oscillation magnet fixed to the holder and an oscillation coil fixed to the fixed body and facing radially opposite the oscillation magnet. The aforementioned magnetic drive mechanism for rotation comprises a rotating magnet fixed to the holder and a rotating coil fixed to the stationary body and facing the rotating magnet in the radial direction. The pressurizing magnet is at least one of the oscillating magnet or the rotating magnet. The optical unit with shake correction function according to claim 1, characterized in that the magnetic material is fixed to the second frame.

3. The first leaf spring is provided in four units at 90° intervals around the optical axis. The optical unit with shake correction function according to claim 1 or 2, characterized in that the first leaf spring comprises a first connecting portion disposed on the object side, a second connecting portion disposed on the image side, and a meandering portion that has one end connected to the first connecting portion and the other end connected to the second connecting portion and extends in the direction of the optical axis while meandering.

4. The first frame comprises a flat plate portion fixed to one side of the movable body, either the object side or the image side. The second frame comprises a flat plate-shaped second plate portion positioned on the other side of the movable body, either on the object side or the image side. The first leaf spring connects the first flat plate portion and the second flat plate portion, At least one of the first flat plate portion or the second flat plate portion is a portion that connects to the first spring. The optical unit with shake correction function according to claim 1, further comprising a second plate spring that is elastically deformable in the direction of the optical axis.

5. The rotation support mechanism includes a restricting frame positioned such that a gap is formed between the movable body and the optical axis on either the object side or the image side of the movable body. The optical unit with shake correction function according to claim 1, characterized in that when the movable body moves to either the object side or the image side, it comes into contact with the restricting frame, thereby restricting the range of motion on either the object side or the image side.

6. The optical unit with shake correction function according to claim 5, characterized in that the rotation support mechanism includes a restricting part for restricting the range of motion of the movable body in a plane perpendicular to the optical axis with respect to the second frame.

7. The optical unit with shake correction function according to claim 6, characterized in that the restricting portion comprises a first projection protruding from the holder toward the restricting frame, and a first notch formed in the restricting frame toward which the first projection contacts when the first projection moves in a direction perpendicular to the optical axis.

8. The optical unit with shake correction function according to claim 6 or 7, characterized in that the restricting portion comprises a second projection protruding from the holder toward the second frame, and a second notch formed on the second frame, with which the second projection contacts when the second projection moves in a direction perpendicular to the optical axis.

Images