CN117241123A - Optical unit with jitter correction function - Google Patents

Abstract

When the optical unit with the shake correction function is configured to be a movable portion in which a portion other than a center of gravity position adjustment member for adjusting the center of gravity position of the movable body is rotated with respect to the fixed body, even if a weight of a specific portion of the movable portion in a circumferential direction around an optical axis of the camera module is heavy, it is possible to suppress a weight balance of the movable portion in a state where the center of gravity position adjustment member is mounted from being broken in the circumferential direction. In an optical unit (1) with a shake correction function, a center-of-gravity position adjustment member (16) is formed by rounding an elongated rectangular metal plate (37) in the longitudinal direction of the metal plate, and the short side direction of the metal plate is parallel to the optical axis of a camera module (2). The shape of the center-of-gravity position adjusting member when viewed from the optical axis direction of the camera module (2) is C-shaped, and one end surface of the metal plate in the circumferential direction centering on the optical axis of the camera module is separated from the other end surface without contact.

Description

Optical unit with jitter correction function

Technical Field

The present invention relates to an optical unit with a shake correction function for a small-sized camera.

Background

Conventionally, an optical unit with a shake correction function mounted on a portable device or the like is known (for example, refer to patent document 1). The optical unit with a shake correction function described in patent document 1 includes: a movable body (movable module) having a camera module (optical module); a fixed body which holds the movable body via a gimbal mechanism so as to be swingable; and a shake correction drive mechanism for swinging the movable body relative to the fixed body. The movable body includes a weight for adjusting the position of the center of gravity of the movable body.

In the optical unit with the shake correction function described in patent document 1, the weight is formed of a non-magnetic metal material. For example, the counterweight is formed of brass. The counterweight is composed of a cylindrical portion formed in a cylindrical shape and a circular ring-shaped and flat plate-shaped front plate portion connected to the inner peripheral side of the cylindrical portion at one end of the cylindrical portion. The counterweight is fixed to the holder of the camera module so that the axis of the cylindrical portion of the counterweight coincides with the optical axis of the camera module. The weight distribution of the counterweight is constant in the circumferential direction centered on the optical axis of the camera module.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2015-64501

Disclosure of Invention

In the optical unit with shake correction function described in patent document 1, if a portion other than the counterweight swings with respect to the fixed body as the movable portion, the weight distribution of the movable portion is not constant in the circumferential direction around the optical axis of the camera module depending on the configuration of the movable portion, and the weight of a specific portion of the movable portion in the circumferential direction may be increased. In the optical unit with the shake correction function described in patent document 1, since the weight distribution of the counterweight is constant in the circumferential direction around the optical axis of the camera module, if the weight of a specific portion of the movable portion in the circumferential direction becomes heavy, the weight balance of the movable portion in the state where the counterweight is attached is broken in the circumferential direction, and there is a possibility that the shake correction control of the shake correction drive mechanism becomes complicated.

Accordingly, an object of the present invention is to provide an optical unit with a shake correction function, including: a movable body having a center-of-gravity position adjusting member for adjusting a center-of-gravity position of the movable body and a camera module; and a fixed body that holds the movable body rotatably, wherein when a portion other than the center of gravity position adjustment member is set as the movable portion with respect to the fixed body rotation, even if the weight of a specific portion of the movable portion in a circumferential direction centering on the optical axis of the camera module is heavy, the weight balance of the movable portion in a state where the center of gravity position adjustment member is mounted can be suppressed from being broken in the circumferential direction.

In order to solve the above problems, an optical unit with a shake correction function according to the present invention includes: a movable body having a camera module; a fixed body that rotatably holds the movable body; and a magnetic drive mechanism for rotating the movable body relative to the fixed body so as to tilt the optical axis of the camera module in an arbitrary direction, wherein the movable body includes a center-of-gravity position adjustment member for adjusting the center-of-gravity position of the movable body, the center-of-gravity position adjustment member is formed by rounding a long and thin rectangular metal plate in a longitudinal direction of the metal plate, a short side direction of the metal plate is parallel to the optical axis of the camera module, the shape of the center-of-gravity position adjustment member is C-shaped when viewed from the direction of the optical axis of the camera module, that is, the shape of the center-of-gravity position adjustment member is not in contact with the other end surface of the metal plate in a circumferential direction centering on the optical axis of the camera module, and the center-of-gravity position adjustment member is separated from the other end surface.

In the optical unit with a shake correction function according to the present invention, the center-of-gravity position adjustment member is formed by rounding an elongated rectangular metal plate in the longitudinal direction of the metal plate, and the short side direction of the metal plate is parallel to the optical axis of the camera module. In the present invention, the center of gravity position adjusting member is C-shaped when viewed from the optical axis direction of the camera module, and one end surface of the metal plate in the circumferential direction centering on the optical axis of the camera module is separated from the other end surface without being in contact with the other end surface.

Therefore, in the present invention, when the movable portion is a portion that rotates relative to the fixed body and that is other than the center of gravity position adjustment member, even if the weight of a specific portion of the movable portion in the circumferential direction is heavy, the weight balance of the movable portion in the state where the center of gravity position adjustment member is attached can be suppressed from being broken in the circumferential direction by disposing a portion of the center of gravity position adjustment member that is separated from the other end surface of the metal plate (i.e., a portion of the center of gravity position adjustment member that is light in the circumferential direction) at the same position as the specific portion of the movable portion that is heavy in weight. In addition, in the present invention, since the center of gravity position adjusting member is formed by rounding the elongated rectangular metal plate in the longitudinal direction of the metal plate, the center of gravity position adjusting member can be easily manufactured at low cost.

In the present invention, it is preferable that the movable body includes a holder for fixing the camera module, the holder includes a cylindrical tube portion in which at least a part of the camera module is disposed on an inner peripheral side, the center-of-gravity position adjusting member is fixed to an outer peripheral surface of the tube portion, and a convex portion is formed on the outer peripheral side of the tube portion, and the convex portion is disposed between one end surface of the metal plate and the other end surface of the metal plate in a circumferential direction around an optical axis of the camera module.

With this configuration, the protruding portion formed on the outer peripheral side of the cylindrical portion of the holder can be used to position the portion of the metal plate of the weight position adjusting member that is separated from the other end surface in the circumferential direction. Therefore, by forming the protruding portion at the same position as the specific portion where the weight of the movable portion becomes heavy in the circumferential direction, the portion where the one end surface and the other end surface of the metal plate of the center-of-gravity position adjusting member are separated can be easily and reliably arranged at the same position as the specific portion where the weight of the movable portion becomes heavy in the circumferential direction.

In the present invention, an optical unit with a shake correction function includes, for example, a wiring board led out from a movable body, the movable body includes a holder for fixing a camera module, and a magnetic driving mechanism includes: a plurality of driving magnets fixed to the fixed body; and a plurality of driving coils disposed opposite to the driving magnet and fixed to the holder, the plurality of driving coils being disposed at a constant pitch in a circumferential direction around an optical axis of the camera module, the wiring board including: a first wiring board on which a driving coil is mounted; a second wiring board led out from the camera module; a first connector mounted on the first wiring board; and a second connector attached to the second wiring board and connected to the first connector, wherein the first wiring board includes a movable-side fixed portion fixed to the holder and to which the first connector is attached, the first connector and the second connector overlap in the optical axis direction, and a portion of the center-of-gravity position adjusting member where one end surface of the metal plate is separated from the other end surface of the metal plate is arranged at a position where the first connector and the second connector are arranged in a circumferential direction around the optical axis of the camera module.

In this case, in a later step of the assembly process of the optical unit with the shake correction function, the camera module can be fixed to the holder, and the second wiring board can be connected to the movable-side fixed portion of the first wiring board using the first connector and the second connector. Therefore, the degree of freedom in the assembly process of the optical unit with the shake correction function can be improved.

In this case, the portion where the first connector and the second connector are arranged in the circumferential direction around the optical axis of the camera module becomes a specific portion where the weight of the movable portion becomes heavy due to the influence of the weight of the first connector and the second connector, but since the portion where the one end surface of the metal plate of the center-of-gravity position adjusting member is separated from the other end surface of the metal plate is arranged in the circumferential direction at the position where the first connector and the second connector are arranged, even if the wiring board includes the first connector and the second connector, the weight balance of the movable portion in the state where the center-of-gravity position adjusting member is mounted can be suppressed from being broken in the circumferential direction.

As described above, in the optical unit with shake correction function including the movable body having the center-of-gravity position adjusting member for adjusting the center-of-gravity position of the movable body and the camera module and the fixed body rotatably holding the movable body, even if the weight of a specific portion of the movable portion in the circumferential direction centering on the optical axis of the camera module is heavy when the movable portion is a movable portion that rotates relative to the fixed body and is other than the center-of-gravity position adjusting member, the weight balance of the movable portion in the circumferential direction in a state where the center-of-gravity position adjusting member is attached can be suppressed from being broken.

Drawings

Fig. 1 is a perspective view of an optical unit with a shake correction function according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the optical unit with a shake correction function shown in fig. 1.

Fig. 3 is a plan view showing a state in which the fixed body is detached from the optical unit with the shake correction function shown in fig. 1.

Fig. 4 is an exploded perspective view showing the camera module, the first wiring substrate, and the second wiring substrate shown in fig. 2 from different directions.

Fig. 5 is an enlarged view for explaining the structure of the movable body and the like of the E section in fig. 3.

Detailed Description

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

(integral Structure of optical Unit with shake correction function)

Fig. 1 is a perspective view of an optical unit 1 with a shake correction function according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the optical unit 1 with a shake correction function shown in fig. 1. Fig. 3 is a plan view showing a state in which the fixing body 5 is removed from the optical unit 1 with the shake correction function shown in fig. 1.

In the following description, as shown in fig. 1, three directions orthogonal to each other are respectively an X direction, a Y direction, and a Z direction, the X direction is a left-right direction, the Y direction is a front-rear direction, and the Z direction is an up-down direction. The X1 direction side of fig. 1 and the like, which are one side in the left-right direction, the X2 direction side of fig. 1 and the like, which are the opposite sides thereof, are the "left" side, the Y1 direction side of fig. 1 and the like, which are one side in the front-rear direction, is the "front" side, the Y2 direction side of fig. 1 and the like, which are the opposite sides thereof, is the "rear" side, the Z1 direction side of fig. 1 and the like, which are the one side in the up-down direction, is the "up" side, and the Z2 direction side of fig. 1 and the like, which are the opposite sides thereof, is the "down" side.

The optical unit 1 with a shake correction function (hereinafter referred to as "optical unit 1") according to the present embodiment is a small-sized unit used in a small-sized camera such as a personal camera (body camera), and includes a camera module 2, and the camera module 2 includes a lens for photographing and an imaging element. The optical unit 1 has a shake correction function for avoiding disturbance of an image captured when shake occurs during shooting.

The optical unit 1 includes: a movable body 3 having a camera module 2; an intermediate member 4 rotatably holding the movable body 3; and a fixing body 5 (refer to fig. 1) rotatably holding the intermediate member 4. The movable body 3 is rotatable relative to the intermediate member 4 with respect to a first intersecting direction (V direction in fig. 3) intersecting the optical axis L of the camera module 2 as an axial direction of rotation. That is, the movable body 3 is rotatable with respect to the intermediate member 4 about a first axis L1 (see fig. 3) having the first intersecting direction as an axis direction. The first intersecting direction of the present embodiment is orthogonal to the optical axis L.

The intermediate member 4 is rotatable relative to the fixed body 5 with respect to a second intersecting direction (W direction in fig. 3) intersecting the first intersecting direction and intersecting the optical axis L of the camera module 2 as an axial direction of rotation. That is, the intermediate member 4 can rotate with respect to the fixed body 5 about a second axis L2 (see fig. 3) having the second intersecting direction as an axis direction. In the present embodiment, the second intersecting direction is orthogonal to the first intersecting direction. Thus, a 2-axis gimbal mechanism is formed between the movable body 3 and the fixed body 5.

In the present embodiment, when no current is supplied to the driving coils 25 and 27 described later, the movable body 3 and the intermediate member 4 are disposed at predetermined reference positions, and the camera module 2 is disposed at the predetermined reference positions. When the camera module 2 is positioned at the reference position, the direction of the optical axis L of the camera module 2, that is, the optical axis direction coincides in design with the up-down direction. In addition, the inclination of the optical axis L of the camera module 2 with respect to the up-down direction at the time of shake correction is small. Therefore, the optical axis direction of the camera module 2 substantially coincides with the up-down direction.

When the movable body 3 is disposed at a predetermined reference position, the second intersecting direction (W direction) is orthogonal to the optical axis L. That is, when the movable body 3 is disposed at a predetermined reference position without rotating relative to the intermediate member 4, the second intersecting direction is orthogonal to the optical axis L. On the other hand, when the movable body 3 rotates relative to the intermediate member 4, the second intersecting direction intersects the optical axis L, but does not intersect at right angles. The second intersecting direction (W direction) is a direction offset by about 45 ° from the front-rear direction in the clockwise direction of fig. 3 when viewed from the upper side.

The optical unit 1 includes magnetic driving mechanisms 8 and 9, and the magnetic driving mechanisms 8 and 9 are used to rotate the movable body 3 relative to the fixed body 5 so as to tilt the optical axis L of the camera module 2 in an arbitrary direction (see fig. 3). The optical unit 1 further includes a wiring board 10 led out from the movable body 3. First fulcrum portions 12 serving as fulcrums for rotating the movable body 3 with respect to the intermediate member 4 are disposed at both end portions in the first intersecting direction of the intermediate member 4. Second fulcrum portions 13 serving as fulcrums for rotation of the intermediate member 4 with respect to the fixed body 5 are arranged at both end portions in the second intersecting direction of the intermediate member 4.

The movable body 3 includes: a holder 15 for fixing the camera module 2; and a balancer (counterweight) 16 for adjusting the position of the center of gravity of the movable body 3. The holder 15 is formed of a resin material. The holder 15 includes: a cylindrical portion 15a formed in a cylindrical shape; two outer peripheral wall portions 15b disposed on the outer peripheral side of the tubular portion 15a; and an annular bottom surface portion 15c connecting the lower end portion of the tubular portion 15a and the lower end portions of the two outer peripheral wall portions 15 b. The cylindrical portion 15a is formed in a cylindrical shape. The balancer 16 functions to bring the center of gravity of the movable body 3 close to the rotation center of the movable body 3. The balancer 16 of the present embodiment is a center-of-gravity position adjusting member. The specific structure of the holder 15 and the balancer 16 will be described later.

The camera module 2 is fixed to the inner peripheral surface of the cylindrical portion 15a so that the outer peripheral side of a part of the camera module 2 is covered with the holder 15. The upper end of the camera module 2 is disposed above the upper end of the tube 15 a. The lower end of the camera module 2 is disposed below the lower end of the holder 15. That is, a part of the camera module 2 is disposed on the inner peripheral side of the cylindrical portion 15 a. At the lower end of the camera module 2, a plurality of protrusions 2a protruding toward the lower side are formed. For example, four protrusions 2a are formed at the lower end portion of the camera module 2.

As described above, the camera module 2 includes a lens and an imaging element. The imaging element is disposed at the lower end side of the camera module 2, and an object disposed at the upper side of the camera module 2 is imaged by the camera module 2. As described above, the inclination of the optical axis L of the camera module 2 with respect to the vertical direction at the time of shake correction is small, and the optical axis direction of the camera module 2 substantially coincides with the vertical direction. Therefore, if one side in the optical axis direction of the camera module 2 (specifically, the side on which the object is arranged in the optical axis direction of the camera module 2) is taken as the object side, and the opposite side of the object side (specifically, the side on which the image pickup element is arranged in the optical axis direction of the camera module 2) is taken as the object opposite side, the object side substantially coincides with the upper side, and the object opposite side substantially coincides with the lower side.

The intermediate member 4 is formed of a metal material such as stainless steel. The intermediate member 4 is formed in an octagonal frame shape. The intermediate member 4 is disposed on the outer peripheral side of the cylindrical portion 15a and on the inner peripheral side of the outer peripheral wall portion 15b of the holder 15.

The fixed body 5 rotatably holds the movable body 3 via the intermediate member 4. The fixing body 5 includes: a case 17 covering the holder 15 from the outer peripheral side; and a cover 18 fixed to the housing 17. The housing 17 is formed of a resin material. The intermediate member 4 is rotatably held on the housing 17. The housing 17 is constituted by a cylindrical tube portion 17a covering the holder 15 from the outer peripheral side and an upper surface portion 17b constituting the upper surface of the housing 17.

The upper surface portion 17b constitutes the upper surface of the optical unit 1. The upper surface portion 17b is connected to the upper end of the tube portion 17a. The upper surface 17b is formed with a circular through hole. In the through hole, an upper end portion of the camera module 2 is disposed. The upper surface portion 17b covers the driving mechanisms 8, 9, the first fulcrum portion 12, the second fulcrum portion 13, and the like from above. A cutout 17c for guiding the wiring board 10 is formed at the right front side portion of the cylindrical portion 17a. A board fixing portion 17d is formed at the left front side portion of the cylindrical portion 17a, and a fixing-side fixed portion 30c, which is a part of the wiring board 10 and is described later, is fixed to the board fixing portion 17d.

The cover 18 is formed of a metallic material. The cover 18 constitutes the lower surface and the side surfaces of the optical unit 1. The cover 18 is composed of a flat bottom 18a disposed below the cylindrical portion 17a of the housing 17, and a cylindrical portion 18b rising upward from the bottom 18 a. The bottom 18a is arranged such that the thickness direction of the bottom 18a coincides with the up-down direction. The upper surface of the bottom 18a contacts the lower end surface of the cylindrical portion 17a. The cylindrical portion 18b covers the cylindrical portion 17a of the housing 17 from the outer peripheral side. The upper end of the cylindrical portion 18b is in contact with the lower surface of the upper surface portion 17b of the housing 17. A cutout 18c is formed in the tube portion 18b, and the cutout 18c is used to dispose the board fixing portion 17d of the housing 17 and to draw out the wiring board 10 to the outer peripheral side of the optical unit 1.

The first fulcrum portion 12 includes: a leaf spring 20 fixed to the holder 15; and balls 21 (see fig. 2) fixed to both ends of the intermediate member 4 in the first intersecting direction. The leaf spring 20 is composed of a fixed portion 20a fixed to the holder 15 and a spring portion 20b connected to the fixed portion 20 a. The fixed portion 20a is fixed to the inner peripheral side of the outer peripheral wall portion 15b of the holder 15. The spring portion 20b is disposed inside the fixed portion 20a in the first intersecting direction, and is disposed outside the sphere 21. The spring portion 20b is formed with a recess in which a part of the ball 21 is disposed. The concave portion is recessed toward the outside in the first intersecting direction. The ball 21 contacts the bottom surface of the concave portion of the spring portion 20b from the inside in the first intersecting direction with a predetermined contact pressure by the elasticity of the spring portion 20 b.

The second fulcrum portion 13 includes: a leaf spring 22 fixed to the housing 17; and balls 23 (see fig. 2) fixed to both ends of the intermediate member 4 in the second intersecting direction. The leaf spring 22 is composed of a fixed portion 22a fixed to the housing 17 and a spring portion 22b connected to the fixed portion 22 a. The fixed portion 22a is fixed to the inner peripheral side of the tube portion 17a of the housing 17. The spring portion 22b is disposed inside the fixed portion 22a in the second intersecting direction, and is disposed outside the sphere 23. The spring portion 22b is formed with a recess in which a part of the ball 23 is disposed. The concave portion is recessed toward the outside in the second intersecting direction. The ball 23 contacts the bottom surface of the concave portion of the spring portion 22b from the inside in the second intersecting direction with a predetermined contact pressure by the elasticity of the spring portion 22 b.

The magnetic drive mechanism 8 includes a drive magnet 24 and a drive coil 25 arranged to face each other in the left-right direction. The magnetic drive mechanism 9 includes a drive magnet 26 and a drive coil 27 disposed to face each other in the front-rear direction. The driving magnets 24 and 26 are formed in a rectangular flat plate shape. The driving magnets 24 and 26 are fixed to the fixed body 5. The driving coils 25 and 27 are, for example, air coils formed by winding a wire into an air-core shape. The driving coils 25 and 27 are fixed to the holder 15.

The driving magnet 24 is fixed to the inner peripheral surface of the cylindrical portion 17a of the housing 17. The driving coil 25 is fixed to the outer surface of the outer peripheral wall portion 15b of the holder 15. In the present embodiment, the driving magnet 24 and the driving coil 25 are disposed opposite each other on both sides of the holder 15 in the left-right direction. The magnetic drive mechanism 8 rotates the movable body 3 relative to the fixed body 5 about an axis line orthogonal to the optical axis L of the camera module 2 and parallel to the front-rear direction as a rotation center.

The driving magnet 26 is fixed to the inner peripheral surface of the cylindrical portion 17a of the housing 17. The driving coil 27 is fixed to the outer surface of the outer peripheral wall portion 15b of the holder 15. In the present embodiment, the driving magnet 26 and the driving coil 27 are disposed opposite each other on both sides of the holder 15 in the front-rear direction. The magnetic drive mechanism 9 rotates the movable body 3 relative to the fixed body 5 about an axis line orthogonal to the optical axis L of the camera module 2 and parallel to the left-right direction as a rotation center.

The distance between the driving magnet 24 in the left-right direction and the optical axis L of the camera module 2 is equal to the distance between the driving magnet 26 in the front-rear direction and the optical axis L of the camera module 2. The distance between the driving coil 25 in the left-right direction and the optical axis L of the camera module 2 is equal to the distance between the driving coil 27 in the front-rear direction and the optical axis L of the camera module 2. The four driving magnets 24 and 26 are arranged at a constant pitch in the circumferential direction around the optical axis L of the camera module 2, and the four driving coils 25 and 27 are arranged at a constant pitch in the circumferential direction around the optical axis L of the camera module 2. That is, the driving magnets 24 and 26 are arranged at a 90 ° pitch around the optical axis L of the camera module 2, and the driving coils 25 and 27 are arranged at a 90 ° pitch around the optical axis L of the camera module 2.

In the optical unit 1, when the tilt change of the movable body 3 is detected by a predetermined detection means for detecting the tilt change of the movable body 3, a current is supplied to at least one of the driving coil 25 and the driving coil 27 based on the detection result of the detection means, and the shake is corrected. The magnetic driving mechanisms 8 and 9 rotate the movable body 3 with respect to the fixed body 5 about at least one of the first axis L1 and the second axis L2 as a rotation center. In the present embodiment, the lower end of the projection 2a of the camera module 2 is in contact with the upper surface of the bottom 18a of the cover 18, so that the rotation range of the movable body 3 with respect to the fixed body 5 and the movement range of the movable body 3 in the optical axis direction of the camera module 2 are limited.

(Structure of Wiring Board and routing)

Fig. 4 is an exploded perspective view showing the camera module 2, the first wiring board 30, and the second wiring board 31 shown in fig. 2 from different directions.

The wiring board 10 is composed of a first wiring board 30 on which the driving coils 25 and 27 are mounted, and a second wiring board 31 led out from the camera module 2. The first wiring board 30 and the second wiring board 31 are formed separately. The first wiring board 30 and the second wiring board 31 are connected by a connector 32 (see fig. 4) as a first connector mounted on the first wiring board 30 and a connector 33 (see fig. 2) as a second connector mounted on the second wiring board 31 and connected to the connector 32. That is, the wiring board 10 includes connectors 32 and 33. Either one of the connector 32 and the connector 33 is a male connector, and the other one of the connector 32 and the connector 33 is a female connector.

The first wiring board 30 is a rigid flexible board formed by integrating a flexible printed board and a rigid board. The first wiring board 30 includes: a coil connection portion 30a for connecting the driving coils 25 and 27; a movable-side fixed portion 30b fixed to the holder 15; a fixed-side fixed portion 30c fixed to the housing 17; a belt-shaped portion 30d connecting the movable-side fixed portion 30b and the fixed-side fixed portion 30c; and a lead portion 30e led out to the outer peripheral side of the fixed body 5.

The first wiring board 30 of the present embodiment is constituted by four coil connecting portions 30a, one movable-side fixed portion 30b, one fixed-side fixed portion 30c, one belt-like portion 30d, and one lead-out portion 30e. The coil connecting portion 30a, the movable-side fixed portion 30b, the fixed-side fixed portion 30c, the band portion 30d, and the lead portion 30e are integrally formed. The coil connection portion 30a is formed of a flexible printed board. The driving coils 25 and 27 are mounted on the coil connecting portion 30a. The coil connecting portion 30a is fixed to the outer surface of the outer peripheral wall portion 15b of the holder 15.

The movable-side fixed portion 30b is formed of a rigid substrate. The movable-side fixed portion 30b is formed in a ring shape and a flat plate shape. The movable-side fixed portion 30b is fixed to a surface (lower surface) of the holder 15 opposite to the subject. For example, the movable-side fixed portion 30b is adhered to the surface of the holder 15 opposite to the subject with an adhesive. The surface of the holder 15 on the opposite side of the object is a plane orthogonal to the optical axis direction of the camera module 2, and the movable-side fixed portion 30b is disposed such that the thickness direction of the movable-side fixed portion 30b coincides with the optical axis direction of the camera module 2. The movable-side fixed portion 30b is sandwiched between the lower end portion of the camera module 2 and the holder 15 in the optical axis direction of the camera module 2.

The coil connecting portion 30a is connected to the movable-side fixed portion 30b. Specifically, the coil connecting portion 30a is connected to four portions in total of two portions at both ends in the lateral direction of the movable-side fixed portion 30b and two portions at both ends in the front-rear direction of the movable-side fixed portion 30b. The connector 32 is attached to the movable-side fixed portion 30b. Specifically, the connector 32 is attached to the surface of the movable-side fixed portion 30b on the opposite side of the subject. More specifically, the connector 32 is attached to a right front side portion that is a portion on one side in the first intersecting direction of the surface on the opposite side of the object of the movable side fixed portion 30b.

The fixed-side fixed portion 30c is formed of a rigid substrate. The fixed-side fixed portion 30c is formed in a rectangular flat plate shape. The fixed-side fixed portion 30c is fixed to the substrate fixing portion 17d of the housing 17. The fixed-side fixed portion 30c is disposed such that the thickness direction of the fixed-side fixed portion 30c coincides with the second intersecting direction. The lead portion 30e is formed of a flexible printed board. The lead portion 30e is formed in a slender strip shape having a width direction corresponding to the first intersecting direction. The lead portion 30e is connected to the lower end of the fixed-side fixed portion 30 c. The lead portion 30e extends from the lower end of the fixed-side fixed portion 30c to the left front side.

The band portion 30d is formed of a flexible printed board. The band portion 30d is formed in an elongated band shape. The belt portion 30d is led out from the movable-side fixed portion 30b. The belt-shaped portion 30d is led from the movable-side fixed portion 30b to the right front side on one side in the first intersecting direction, bent upward by 90 °, then led to the left front side on one side in the second intersecting direction, bent leftward by 90 °, and then led to the left rear side on the other side in the first intersecting direction. The band portion 30d is wound around the inner peripheral surface of the tube portion 18b of the cover 18. A thin L-shaped reinforcing plate 35 for maintaining the shape of the band 30d is fixed to the portion of the band 30d bent at 90 °. The band portion 30d is not fixed to either the movable body 3 or the fixed body 5.

The second wiring substrate 31 is a rigid flexible substrate. The second wiring board 31 is constituted by an image pickup element mounting portion 31a on which the image pickup element of the camera module 2 is mounted, a lead-out portion 31b having one end connected to the image pickup element mounting portion 31a, and a connected portion 31c connected to the other end side of the lead-out portion 31 b. The imaging element mounting portion 31a and the connected portion 31c are formed of a rigid substrate. The lead portion 31b is formed of a flexible printed board. The imaging element mounting portion 31a is fixed to the lower end portion of the camera module 2. The image pickup element mounting portion 31a is disposed such that the thickness direction of the image pickup element mounting portion 31a coincides with the optical axis direction of the camera module 2. The image pickup element is mounted on the object-side surface of the image pickup element mounting portion 31 a.

The lead portion 31b is connected to a right front portion of the image pickup element mounting portion 31 a. The connected portion 31c is formed in a rectangular flat plate shape. The connected portion 31c is connected to the right front end portion of the lead portion 31 b. The connected portion 31c is disposed such that the thickness direction of the connected portion 31c substantially coincides with the optical axis direction of the camera module 2. The connected portion 31c overlaps with a right front side portion of the movable side fixed portion 30b in the optical axis direction of the camera module 2. The connected portion 31c is disposed on the opposite side of the subject from the right front portion of the movable-side fixed portion 30b.

The connector 33 is mounted on the object-side surface of the connected portion 31 c. The second wiring board 31 is connected to the movable-side fixed portion 30b. Specifically, the connected portion 31c is connected to the movable-side fixed portion 30b via the connectors 32 and 33. The connector 32 and the connector 33 overlap in the optical axis direction of the camera module 2.

When the optical unit 1 is assembled, first, components other than the camera module 2, the second wiring board 31, and the cover 18 are assembled. Then, the camera module 2 in a state where the second wiring board 31 is mounted is assembled. At this time, the camera module 2 is inserted from the object side opposite to the inner peripheral side of the cylindrical portion 15a of the holder 15 and the inner peripheral side of the movable side fixed portion 30b. The connector 32 and the connector 33 are connected to each other, and the second wiring board 31 is connected to the movable-side fixed portion 30b. Then, the cover 18 is attached to the housing 17 from the opposite side of the subject.

(Structure of balancer and cage)

Fig. 5 is an enlarged view for explaining the structure of the movable body 3 and the like of the E section in fig. 3. In the following description, a circumferential direction (circumferential direction) around the optical axis L of the camera module 2 is referred to as a "circumferential direction".

The balancer 16 is formed of a metal material. For example, the balancer 16 is formed of stainless steel or copper alloy. The specific gravity of the metal balancer 16 is greater than that of the resin cage 15. The balancer 16 is formed by rolling an elongated rectangular metal plate 37 into a circular shape along the longitudinal direction of the metal plate 37, and has elasticity. The metal plate 37 is a thin plate. The width and thickness of the metal plate 37 are constant. The balancer 16 is fixed to the outer peripheral surface of the cylindrical portion 15a so as to surround the cylindrical portion 15a of the holder 15, and is disposed on the outer peripheral side of the cylindrical portion 15 a. The balancer 16 is disposed such that the short side direction of the metal plate 37 is parallel to the optical axis L of the camera module 2. That is, the short side direction of the metal plate 37 is parallel to the optical axis L of the camera module 2.

The balancer 16 has a C-shape when viewed from the optical axis direction of the camera module 2. That is, the one end surface 37a and the other end surface 37b of the metal plate 37 in the circumferential direction are separated without contact (see fig. 5), and the balancer 16 is formed in a ring shape with a part of the circumferential direction cut out. In the following description, a portion of the balancer 16 where one end surface 37a is separated from the other end surface 37b (i.e., a portion to be cut) is referred to as a "cut portion 16a".

As described above, the balancer 16 is fixed to the outer peripheral surface of the cylindrical portion 15a of the holder 15. Specifically, the balancer 16 is fixed to the outer peripheral surface of the upper portion of the cylindrical portion 15a so as to surround the upper portion of the cylindrical portion 15a from the outer peripheral side. The balancer 16 is fixed to the outer peripheral surface of the cylindrical portion 15a, for example, by an adhesive. The inner peripheral surface of the balancer 16 is in contact with the outer peripheral surface of the cylindrical portion 15 a. The center of curvature of the balancer 16 configured in a circular shape substantially coincides with the optical axis L of the camera module 2. The cylindrical portion 15a is formed with an abutment surface 15d (see fig. 2) that abuts against an end surface on the opposite side of the object of the balancer 16. The contact surface 15d is a plane orthogonal to the optical axis direction of the camera module 2.

A convex portion 15e arranged between one end surface 37a and the other end surface 37b of the metal plate 37 in the circumferential direction is formed on the outer circumferential side of the cylindrical portion 15 a. That is, the convex portion 15e disposed in the cutout portion 16a of the balancer 16 is formed on the outer peripheral side of the cylindrical portion 15 a. The convex portion 15e is formed in a rectangular parallelepiped shape elongated in the optical axis direction of the camera module 2. One end surface 37a of the metal plate 37 can be in contact with one end surface of the protruding portion 15e in the circumferential direction, and the other end surface 37b of the metal plate 37 can be in contact with the other end surface of the protruding portion 15e in the circumferential direction.

The convex portion 15e disposed in the cutout portion 16a of the balancer 16 protrudes toward the right front side which is the side of the first intersecting direction. As described above, the connector 32 is mounted on the right front side portion of the surface of the movable side fixed portion 30b on the opposite side of the subject, and the connector 33 overlaps with the connector 32 in the optical axis direction of the camera module 2. That is, as shown in fig. 5, the notch 16a, which is a portion of the balancer 16 where the one end surface 37a is separated from the other end surface 37b, is arranged at a position where the connectors 32 and 33 are arranged in the circumferential direction.

In the optical unit 1, if a portion (i.e., a portion constituted by the camera module 2, the holder 15, the driving coils 25 and 27, the coil connecting portion 30a, the movable-side fixed portion 30b, the second wiring board 31, the connectors 32 and 33, and the like) which rotates with respect to the fixed body 5 and is other than the balancer 16 is set as a movable portion, a portion of the movable portion in which the connectors 32 and 33 are arranged in the circumferential direction becomes a specific portion in which the weight of the movable portion in the circumferential direction is increased due to the influence of the weight of the connectors 32 and 33 in the present embodiment.

(main effects of the present embodiment)

As described above, in the present embodiment, the balancer 16 is formed by rounding the elongated rectangular metal plate 37 in the longitudinal direction of the metal plate 37, and the short side direction of the metal plate 37 is parallel to the optical axis of the camera module 2. In the present embodiment, the balancer 16 has a C-shape when viewed from the optical axis direction of the camera module 2, and one end surface 37a of the metal plate 37 in the circumferential direction is separated from the other end surface 37b without being in contact with the other end surface. In the present embodiment, the notch 16a (i.e., the portion of the balancer 16 that is lighter in weight in the circumferential direction) that is the portion of the balancer 16 that is separated from the other end surface 37b is disposed at the position where the connectors 32, 33 are disposed in the circumferential direction and at the same position in the circumferential direction as the specific portion of the movable portion that is heavier in weight in the circumferential direction.

Therefore, in the present embodiment, even if the wiring board 10 includes the connectors 32 and 33, the weight of the portion of the movable portion where the connectors 32 and 33 are arranged in the circumferential direction becomes heavy, it is possible to suppress the weight balance of the movable portion from being broken in the circumferential direction in the state where the balancer 16 is mounted. In the present embodiment, the balancer 16 is formed by rounding the elongated rectangular metal plate 37 in the longitudinal direction of the metal plate 37, and therefore, the balancer 16 can be easily manufactured at low cost.

In the present embodiment, the convex portion 15e disposed in the cutout portion 16a of the balancer 16 is formed on the outer peripheral side of the cylindrical portion 15a of the retainer 15. Therefore, in the present embodiment, the notched portion 16a of the balancer 16 (i.e., the portion where the one end surface 37a of the metal plate 37 is separated from the other end surface 37 b) can be positioned in the circumferential direction by the protruding portion 15e. In the present embodiment, the protruding portion 15e is disposed at a position where the connectors 32 and 33 are disposed in the circumferential direction. Therefore, in the present embodiment, the notch portion 16a can be easily and reliably arranged at the same position as the position where the connectors 32 and 33 are arranged in the circumferential direction.

In the present embodiment, the second wiring board 31 is connected to the movable-side fixed portion 30b via the connectors 32 and 33. Therefore, in the present embodiment, as described above, when the optical unit 1 is assembled, after components other than the camera module 2, the second wiring board 31, and the cover 18 are assembled, the camera module 2 in a state where the second wiring board 31 is mounted can be assembled, and the second wiring board 31 can be connected to the movable-side fixed portion 30b. Therefore, in the present embodiment, the degree of freedom in the assembly process of the optical unit 1 can be improved.

(other embodiments)

The above-described embodiments are examples of preferred embodiments of the present invention, but the present invention is not limited thereto, and various modifications and changes can be made without changing the gist of the present invention.

In the above embodiment, the wiring board 10 may not include the connectors 32 and 33. In this case, for example, the connected portion 31c of the second wiring board 31 is connected to the movable side fixed portion 30b of the first wiring board 30 by soldering. In this case, for example, the portion of the movable portion to which the connection portion 31c in the circumferential direction is soldered to the movable-side fixed portion 30b becomes a specific portion of the movable portion that is heavy in the circumferential direction.

In the above embodiment, the convex portion 15e may not be formed on the outer peripheral side of the cylindrical portion 15a of the holder 15. In this case, when the balancer 16 is fixed to the cylindrical portion 15a, the cutout portion 16a of the balancer 16 is positioned in the circumferential direction using a predetermined jig, for example. In the above embodiment, the balancer 16 may be formed with a through hole. In addition, the inner peripheral surface of the balancer 16 may be recessed, or the outer peripheral surface of the balancer 16 may be recessed or recessed.

In the above embodiment, the fixed body 5 may rotatably hold the movable body 3 by a leaf spring so as to tilt the optical axis L of the camera module 2 in an arbitrary direction. In this case, the leaf spring includes, for example: a movable-side fixed part fixed to the holder 15; a fixed portion fixed to a fixed side of the housing 17; and an arm portion connecting the fixed portion on the movable side and the fixed portion on the fixed side. In this case, the optical unit 1 may not include the intermediate member 4, the first supporting point portion 12, and the second supporting point portion 13. In the above embodiment, the entirety of the camera module 2 may be disposed on the inner peripheral side of the cylindrical portion 15a of the holder 15.

Symbol description

1. Optical unit (optical unit with shake correction function)

2. Camera module

3. Movable body

5. Fixing body

8. 9 magnetic driving mechanism

10. Wiring board

15. Retainer

15a barrel portion

15e convex part

16. Balancer (gravity position adjusting component)

24. 26 magnet for driving

25. 27 coil for driving

30. First wiring board

30b movable side fixed part

31. Second wiring board

32. Connector (first connector)

33. Connector (second connector)

37. Metal plate

37a end face

37b another end face

L optical axis.

Claims (3)

1. An optical unit with jitter correction function, characterized in that,

the device is provided with: a movable body having a camera module; a fixed body that rotatably holds the movable body; and a magnetic driving mechanism for rotating the movable body with respect to the fixed body to tilt an optical axis of the camera module in an arbitrary direction,

the movable body includes a center-of-gravity position adjusting member for adjusting a center-of-gravity position of the movable body,

the center of gravity position adjusting member is formed by rounding an elongated rectangular metal plate in a longitudinal direction of the metal plate,

the short side direction of the metal plate is parallel to the optical axis of the camera module,

the center of gravity position adjusting member has a C-shape when viewed from an optical axis direction, which is a direction of the optical axis of the camera module, and one end surface of the metal plate in a circumferential direction around the optical axis of the camera module is separated from the other end surface without contact.

2. The optical unit with shake correction function according to claim 1, wherein,

the movable body is provided with a retainer for fixing the camera module,

the holder includes a cylindrical portion having a cylindrical shape, at least a part of the camera module is disposed on an inner peripheral side of the cylindrical portion,

the center of gravity position adjusting member is fixed to an outer peripheral surface of the cylindrical portion,

a convex portion is formed on an outer peripheral side of the cylindrical portion, and is disposed between the one end surface of the metal plate and the other end surface of the metal plate in the circumferential direction around the optical axis of the camera module.

3. An optical unit with a shake correction function according to claim 1 or 2, characterized in that,

comprises a wiring board which is led out from the movable body,

the movable body is provided with a retainer for fixing the camera module,

the magnetic drive mechanism includes: a plurality of driving magnets fixed to the fixed body; and a plurality of driving coils disposed opposite to the driving magnet and fixed to the holder,

the plurality of driving coils are arranged at a constant pitch in the circumferential direction centering on the optical axis of the camera module,

the wiring board is provided with: a first wiring board on which the driving coil is mounted; a second wiring board led out from the camera module; a first connector mounted on the first wiring board; and a second connector mounted on the second wiring board and connected to the first connector,

the first wiring board includes a movable side fixed portion fixed to the holder and to which the first connector is attached,

the first connector and the second connector overlap in the optical axis direction,

the portion of the center of gravity position adjustment member, where the one end surface of the metal plate is separated from the other end surface of the metal plate, is arranged at a position where the first connector and the second connector are arranged in the circumferential direction around the optical axis of the camera module.