CN114675471B

CN114675471B - Optical unit with shake correction function

Info

Publication number: CN114675471B
Application number: CN202111579211.1A
Authority: CN
Inventors: 笠原章吾
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Sankyo Corp
Priority date: 2020-12-24
Filing date: 2021-12-22
Publication date: 2023-04-18
Anticipated expiration: 2041-12-22
Also published as: JP2022100784A; CN114675471A

Abstract

An optical unit with a shake correction function for rotating a movable body about an optical axis, wherein the product height in the optical axis direction is reduced and the number of parts is reduced. The optical unit with a shake correction function includes a rotation support mechanism for rotatably supporting the movable body around the optical axis L and a gimbal mechanism for connecting the rotation support mechanism and the fixed body. The rotation support mechanism includes a rolling element that rolls between the first annular plate portion and the second annular plate portion around the optical axis L. The movable body is provided with a resin holder (24) surrounding the outer periphery of the camera module and a metal first member (25) fixed to the holder, and the first member is provided with: a first annular plate portion (26) that surrounds the optical axis L and that overlaps the camera module (2) when viewed in the direction of the optical axis L; and a first extension part (27) which connects the first annular plate part (26) and the holder (24), is fixed to the inner circumferential side of the magnet of the magnetic drive mechanism (20) for shake correction, and functions as a yoke part.

Description

Optical unit with shake correction function

Technical Field

The present invention relates to an optical unit with a shake correction function that corrects a shake by rotating a camera module about an optical axis.

Background

Among optical units mounted on a portable terminal or a moving body, there is an optical unit in which a moving body including a camera module is rotated about an optical axis, about a first axis intersecting the optical axis, and about a second axis intersecting the optical axis and the first axis in order to suppress disturbance of a photographed image when the portable terminal or the moving body moves. Patent document 1 describes such an optical unit with a shake correction function.

The optical unit with shake correction function of patent document 1 includes a fixed body and a movable body supported rotatably around an optical axis with respect to the fixed body. The movable body is provided with: a camera module provided with a lens; a support body that surrounds the periphery of the camera module; and a gimbal mechanism that supports the camera module rotatably about the first axis and about the second axis inside the support body. Further, the optical unit with a shake correction function includes: a swinging magnetic drive mechanism for rotating the camera module around a first axis and around a second axis in the movable body; a rotation support mechanism for supporting the movable body to be rotatable around the optical axis; and a rolling magnetic drive mechanism for rotating the camera module about the optical axis by rotating the movable body about the optical axis.

In patent document 1, the rotation support mechanism includes a convex portion protruding from the bottom of the movable body toward the rear side in the optical axis direction, and a ball bearing surrounding the convex portion. Further, patent document 1 describes, as another example of the structure of the rotation support mechanism, the following: the rotation support mechanism is provided on the outer peripheral side of the movable body, and includes a structure in which a pivot portion is provided on the bottom of the movable body instead of the ball bearing, a ball bearing in which an arc-shaped convex surface is provided on the side surface of the movable body, and the like.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2015-82072

Disclosure of Invention

Technical problems to be solved by the invention

In the optical unit with shake correction function of patent document 1, a rotation support mechanism such as a ball bearing or a pivot is provided on the rear side of the movable body in the optical axis direction. In such a configuration, the height of the optical unit with the shake correction function in the optical axis direction increases, and it is difficult to reduce the thickness of the entire product in the optical axis direction. Patent document 1 also describes a structure in which a gimbal mechanism is provided inside a movable body and a rotation support mechanism is provided on the outer peripheral side of the movable body, but in such a structure, the outer shape of the entire product as viewed from the optical axis direction becomes large.

The present inventors have applied to an optical unit with a shake correction function in japanese patent application No. 2020-36404, in which a gimbal mechanism is provided outside a movable body and a rotation support mechanism is provided between the gimbal mechanism and the movable body. The rotary support mechanism of Japanese patent application No. 2020-36404 has the following structure: a ball bearing having rolling elements inserted between two annular rail members facing each other in the optical axis direction is disposed so as to surround a lens barrel portion of a camera module, one rail is fixed to an end surface of a movable body on the object side, and the other rail is supported by a gimbal mechanism so as to be rotatable about a first axis. Therefore, it is not necessary to secure a space for disposing the rotation support mechanism on the rear side of the movable body in the optical axis direction and on the outer peripheral side of the movable body.

Here, in the movable body of japanese patent application No. 2020-36404, the holder for holding the camera module is made of a metal plate, and the strength of the holder is secured by providing a holder end plate portion protruding from a holder frame portion surrounding the camera module toward the inner circumferential side. In the rotation support mechanism, two rails holding the rolling elements face each other in the optical axis direction, a metal plate roller connected to the gimbal frame is overlapped with the object side of the two rails, and a metal plate stopper member is overlapped with the object side of the plate roller. When an impact is applied, the stopper member restricts the plate roller from falling off.

In the structure of japanese patent application No. 2020-36404, many components are overlapped in the optical axis direction on the object side of the camera module, and further, since the holder end plate portion covering the camera module and the rotation support mechanism are overlapped in the optical axis direction, the product height in the optical axis direction becomes large. Further, since the number of parts is large, the assembly work takes time, and the dimensional tolerance of many parts is accumulated, so that the dimensional deviation is large.

In view of these points, an object of the present invention is to reduce the product height in the optical axis direction and to reduce the number of components in an optical unit with a shake correction function in which a movable body is rotated about an optical axis.

Technical scheme for solving technical problem

In order to solve the above-described problems, the present invention provides an optical unit with a shake correction function, comprising: a movable body provided with a camera module; a rotation support mechanism that supports the movable body so as to be rotatable around an optical axis of the camera module; a gimbal mechanism that supports the rotation support mechanism so as to be rotatable about a first axis that intersects the optical axis and that supports the rotation support mechanism so as to be rotatable about a second axis that intersects the optical axis and the first axis; and a fixed body that supports the movable body via the gimbal mechanism and the rotation support mechanism, wherein the movable body includes a resin holder that surrounds an outer peripheral side of the camera module, and a metal first member that is fixed to the holder, the first member includes a first annular plate portion that surrounds the optical axis and overlaps the camera module when viewed from the optical axis direction, and a first extension portion that connects the first annular plate portion and the holder, and the rotation support mechanism includes: a first annular groove formed in the first annular plate portion; a second member that includes a second annular plate portion in which a second annular groove is formed that faces the first annular groove in the optical axis direction, and that is supported by the gimbal mechanism so as to be rotatable about the first axis; and a plurality of rolling elements inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion, wherein a shake correction magnet of a shake correction magnetic drive mechanism for rotating the movable body about the first axis and about the second axis is fixed to the holder, and the first extension portion is made of a magnetic metal, extends from the first annular plate portion to an outer circumferential side, is bent to the other side in the optical axis direction, and is fixed to an inner circumferential side of the shake correction magnet.

According to the present invention, the movable body includes the resin-made holder surrounding the outer peripheral side of the camera module and the metal-made first member fixed to the holder, and the first member includes the first annular plate portion surrounding the optical axis and overlapping the camera module when viewed from the optical axis direction, and the first magnetic metal-made first extending portion connecting the first annular plate portion and the holder and fixed to the inner peripheral side of the shake correction magnet. In this way, the track into which the rolling elements of the rotation support mechanism are inserted and the yoke portion of the magnet for the magnetic drive mechanism for correcting shaking are integrated with the first member, so that the number of parts can be reduced, and the ease of assembly of the movable body and the rotation support mechanism can be improved and the cost can be reduced. Further, the yoke portion is integrated with the first member, so that the positional accuracy of the yoke portion can be improved. Further, by making the holder of resin, even if the end plate portion protruding toward the inner peripheral side is not provided at the end portion in the optical axis direction like the holder made of metal plate, the strength can be ensured. Therefore, the height of the movable body in the optical axis direction can be reduced.

In the present invention, it is preferable that the shake correction magnetic drive mechanism includes a first shake correction magnetic drive mechanism that rotates the movable body about the first axis and a second shake correction magnetic drive mechanism that rotates the movable body about the second axis, the shake correction magnet includes a first magnet of the first shake correction magnetic drive mechanism and a second magnet of the second shake correction magnetic drive mechanism, a third magnet of the rolling correction magnetic drive mechanism that rotates the movable body about the optical axis is fixed to the holder, the first magnet, the second magnet, and the third magnet are arranged in a circumferential direction about the optical axis, and the first extending portion is fixed to each of positions of an inner circumferential side of the first magnet, an inner circumferential side of the second magnet, and an inner circumferential side of the third magnet. Accordingly, all of the yoke portions of the magnets for the shake correction magnetic drive mechanism and the roll correction magnetic drive mechanism are integrated with the first member. Therefore, the number of parts can be reduced, and the assembling property of the movable body and the rotation support mechanism can be improved and the cost can be reduced. In addition, the positional accuracy of the yoke can be improved.

In the present invention, it is preferable that the second member includes a pair of second extending portions protruding from the second annular plate portion to both sides in the first axial direction and a pair of second protruding plate portions protruding from the second annular plate portion to both sides in the second axial direction, the pair of second extending portions are connected to the gimbal mechanism, the second annular plate portion is disposed in a gap between the first annular plate portion and the camera module in the optical axis direction, and a stopper protrusion portion facing the second member in the optical axis direction is provided at a diagonal position in the first axial direction and a diagonal position in the second axial direction of the holder. Accordingly, the first annular plate portion functions as a stopper member for restricting the second annular plate portion from coming off. Therefore, since it is not necessary to additionally overlap the stopper member arranged to overlap the second annular plate portion in the optical axis direction, the height of the rotation support mechanism in the optical axis direction can be reduced. Therefore, the height of the optical unit with a shake correction function in the optical axis direction can be reduced. Further, the second annular plate portion provided on the second member can be restricted from being separated from the first annular plate portion by the stopper projection provided on the retainer. Therefore, the second annular plate portion can be restricted from coming off. Further, the retainer is made of resin, and a complicated uneven shape is more easily formed than a metal plate. Therefore, the retainer having the stopper projection is easily manufactured.

In the present invention, it is preferable that the first annular plate portion and the second annular plate portion overlap the camera module from one side in the optical axis direction, and an end portion of the other side in the optical axis direction of the diagonal portion in the first axis direction of the holder and the diagonal portion in the second axis direction of the holder is recessed more than the camera module toward one side in the optical axis direction. Accordingly, the height of the space in which the movable body moves in the optical axis direction when the movable body swings about the first axis and the second axis can be reduced. Therefore, the product height of the optical unit with a shake correction function in the optical axis direction can be reduced. Further, the retainer is made of resin, and a complicated uneven shape is more easily formed than a metal plate. Therefore, it is easy to manufacture the cage having the shape in which the diagonal portions in the first axial direction and the diagonal portions in the second axial direction are recessed.

In the present invention, it is preferable that the first annular plate portion and the second annular plate portion overlap the camera module from one side in the optical axis direction, the holder includes a plurality of side walls arranged in a circumferential direction around the camera module, and a convex portion protruding to the other side in the optical axis direction than the camera module is provided at least one portion of a side wall arranged at an angular position intermediate between the first axis direction and the second axis direction among the plurality of side walls. Accordingly, in the case where the movable body collides with the fixed body due to a drop impact, since the impact is applied to the convex portion, it is possible to avoid the impact from being directly applied to the camera module.

In the present invention, it is preferable that the convex portion is disposed at a center in a circumferential direction of the side wall. Accordingly, the convex portion is disposed at a position of the holder where the distance from the optical axis is smallest, in other words, at a position where the amount of movement in the optical axis direction is smallest when the movable body swings. Therefore, since it is not necessary to increase the clearance in the optical axis direction between the movable body and the fixed body in order to avoid the projection from colliding with the fixed body when the movable body is swung, it is possible to avoid an increase in the product height in the optical axis direction of the optical unit with a shake correction function.

In the present invention, it is preferable that the side surfaces on both sides in the circumferential direction of the convex portion are tapered surfaces inclined in a direction toward the other side in the optical axis direction as going toward the center in the circumferential direction of the convex portion. Accordingly, the convex portion has a large circumferential width at the base end portion, and therefore, the strength is improved. The tapered shape of the side surface is a shape in which the amount of protrusion of the portion increases as the amount of movement in the optical axis direction when the movable body swings. Therefore, it is not necessary to increase the gap in the optical axis direction between the movable body and the fixed body in order to avoid the projection colliding with the fixed body when the movable body is swung, so that it is possible to avoid an increase in the product height in the optical axis direction of the optical unit with the shake correction function.

In the present invention, it is preferable that the rotation support mechanism includes a pressing mechanism that applies a force that brings the first annular groove and the second annular groove closer to each other in the optical axis direction, the pressing mechanism includes a first protruding plate portion that protrudes outward from the first annular plate portion, and a pressing magnet that is fixed to a portion of the second member in a circumferential direction around the optical axis, and the first protruding plate portion is made of a magnetic metal and is attracted by the pressing magnet. Accordingly, the components of the pressing mechanism can be integrated with the first member. Therefore, the number of parts can be reduced, and the assembling property can be improved. Further, by attaching the pressing magnet to the second member that rotates relative to the movable body and providing the first protruding plate portion that is attracted by the pressing magnet to the movable body, it is possible to prevent the rotational position of the first protruding plate portion from being offset by the attraction of the magnets of the shake correction magnetic drive mechanism and the roll correction magnetic drive mechanism that are attached to the movable body. Therefore, the pressurizing mechanism can be prevented from being disturbed by the magnetic driving mechanism for shake correction and the magnetic driving mechanism for roll correction. In addition, the angular position of the movable body about the optical axis can be regulated by the pressurizing mechanism.

In the present invention, it is preferable that the optical axis adjusting device further includes a rotation restricting mechanism that restricts a rotation range of the movable body around the optical axis, the rotation restricting mechanism including: a first rotation restricting portion formed on the first member or the holder; and a second rotation restricting portion formed on the second member, one of the first rotation restricting portion and the second rotation restricting portion surrounding both sides in a circumferential direction of the other of the first rotation restricting portion and the second rotation restricting portion. Accordingly, the rotation restricting mechanism can be completed between the first member and the second member or between the second member and the holder. Therefore, the rotation restricting mechanism can be constituted without the stopper member overlapping the first member and the second member in the optical axis direction, and therefore the height of the rotation support mechanism in the optical axis direction can be reduced. In addition, since the rotation restricting mechanism can be constituted with a small number of parts, a reduction in the dimensional accuracy of the rotation restricting mechanism due to the accumulation of part tolerances can be suppressed. Therefore, the rotation range of the movable body can be restricted with high accuracy.

In the present invention, it is preferable that the first rotation restricting portion extends from the first annular plate portion to an outer peripheral side and is fixed to the holder, and the second rotation restricting portion is disposed in a notch portion formed by cutting out a circumferential central portion of the first rotation restricting portion. Accordingly, the connecting portion connecting the first annular plate portion and the retainer can be used as the first rotation restricting portion, and therefore the shape of the first member can be simplified.

Effects of the invention

According to the present invention, the orbit of the rolling element inserted into the rotation support mechanism and the yoke portion of the magnet for the shake correction magnetic drive mechanism are integrated with the first member, so that the number of parts can be reduced, and the assemblability of the movable body and the rotation support mechanism can be improved and the cost can be reduced. Further, the yoke portion is integrated with the first member, so that the positional accuracy of the yoke portion can be improved. Further, by making the holder of resin, even if the end plate portion protruding toward the inner peripheral side is not provided at the end portion in the optical axis direction like the holder made of metal plate, the strength can be ensured. Therefore, the height of the movable body in the optical axis direction can be reduced.

Drawings

Fig. 1 is a perspective view of an optical unit with a shake correction function.

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

Fig. 3 is a plan view of the optical unit with shake correction function with the cover removed, as viewed from the object side.

Fig. 4 is an exploded perspective view of the optical unit with shake correction function with the cover and the base removed.

Fig. 5 isbase:Sub>A cross-sectional view of the optical unit with shake correction function cut atbase:Sub>A positionbase:Sub>A-base:Sub>A in fig. 3.

Fig. 6 is a cross-sectional view of the optical unit with shake correction function cut at the position B-B in fig. 3.

Fig. 7 is a perspective view of the gimbal frame and gimbal frame receiving part.

Fig. 8 is a perspective view of the movable body and the rotation support mechanism as viewed from the object side.

Fig. 9 is an exploded perspective view of the movable body and the rotation support mechanism.

Fig. 10 is a perspective view of the movable body and the rotation support mechanism viewed from the opposite side to the subject.

Description of the reference numerals

1 \ 8230, an optical unit with a shake correction function; 2 \ 8230and camera module; 2a 8230and lens; 2b 8230and an image pickup element; 3 \ 8230and a shell; 4 \ 8230a cover; 4a 8230and an opening part; 5 \ 8230and a base; 6 \ 8230and flexible printed substrate; 7\8230aflexible printed substrate; 8 \ 8230and hook; 9 \ 8230and protuberance; 10, 8230, a movable body; 11 8230a fixed body; 12 \ 8230and a rotary supporting mechanism; 13 \ 8230and universal frame mechanism; 14 \ 8230and universal frame; 15 \ 8230and a first connecting mechanism; 16 \ 8230and a second connecting mechanism; 17\8230amagnetic plate; 18, 8230in the frame part; 19 \ 8230and a wiring accommodating part; 20 \ 8230, a magnetic driving mechanism for correcting shake; 21 \ 8230, a first magnetic drive mechanism for shake correction; 21C 8230and a first coil; 21M 8230a first magnet; 22 \ 8230and a second magnetic drive mechanism for shake correction; 22C 8230and a second coil; 22M \8230asecond magnet; 23 \ 8230, magnetic drive mechanism for roll correction; 23C, 8230and a third coil; 23M 8230and a third magnet; 24 \ 8230and a retainer; 25, 8230a first part; 26 \ 8230a first annular plate part; 26a 8230with round hole; 27 \ 8230and a first extending part; 28 \ 8230and a first part of the first extending part; 29 \ 8230and a second part of the first extending part; 30A 8230and a main body part of the camera module; 30B 8230and a cylindrical part of a camera module; 31 \ 8230and a first side wall; 32 \ 8230and a second side wall; 32a 8230and a gap part; 33 \ 8230and a third side wall; 34 \ 8230and a fourth side wall; 35 \ 8230and a fifth side wall; 36 \ 8230and a sixth side wall; 37\8230aseventh side wall; 38' \ 8230and an eighth side wall; 39 8230a convex part for stopping; 40 \ 8230a concave part; 41 \ 8230and a bottom surface; 42 \ 8230and a slot part; 43 8230a convex part; 43a 8230and lateral surface; 50 8230a first track member; 51 \ 8230a first plate-like member; 52 \ 8230and a first through hole; 53 \ 8230, a first annular groove; 54 \ 8230and a second annular groove; 55, 8230a second part; 56 \ 8230and rolling bodies; 57 \ 8230and a protective ring; 58 \ 8230and a sphere retaining hole; 59 \ 8230and a pressurizing mechanism; 60 8230a second track member; 61 \ 8230and a second plate-like member; 62 \ 8230and a second through hole; 63 \ 8230and a second annular plate portion; 64 \ 8230and a second extending part; 65 \ 8230a second protruding plate portion; 66' \ 8230, a first part of a second extending part; 67 \ 8230and a second part of the second extending part; 68 8230and a magnet for pressurizing; 69 \ 8230a first protruding plate portion; 70 \ 8230and a rotation limiting mechanism; 71 \ 8230a first rotation limiting part; 72 \ 8230a second rotation limiting part; 73 \ 8230a gap part; 140, 8230and a main body part of a gimbal frame; 141 \ 8230and a first axial side arrangement part; 142 \ 8230and a second shaft side arrangement part; 143, 8230and an opening part; 144, 8230a first axial concave curved surface; 145 \ 8230a gap; 146 \ 8230a protrusion part; 147 \ 8230and a second axial side concave curved surface; 148 \ 8230a gap; 151 \ 8230a first gimbal frame receiving member; 152 \ 8230a sphere; 153, 8230a first thrust receiving member; 154 8230a plate portion; 155, 8230a leg; 156, 8230a, an arm; 157 \ 8230a hole part; 161 \ 8230a concave part; 162, 8230a second gimbal frame receiving member; 163 \ 8230and a sphere; 164 \ 8230a second thrust receiving member; 165 8230a plate part; 166 \ 8230a leg part; 167, 8230a, an arm; 168 \ 8230a leg bend; 181a \ 8230and a second coil fixing hole; 181 \ 8230and a first side plate part; 182 8230and a second side plate part; 183a 8230, a first coil fixing hole; 183 \ 8230and a third side plate part; 184a 8230and a third coil fixing hole; 184 \ 8230and a fourth side plate part; 185' \ 8230and a notch part; 191, 8230a fifth side plate part; 192, 8230a sixth side plate part; 193 \ 8230and a seventh side plate part; 194 \ 8230and a gap part; l8230and optical axis; r1 \ 8230and a first shaft; r2 (8230); second shaft.

Detailed Description

An embodiment of an optical unit with a shake correction function to which the present invention is applied will be described below with reference to the drawings.

(Overall Structure)

Fig. 1 is a perspective view of an optical unit with a shake correction function. Fig. 2 is an exploded perspective view of the optical unit with the shake correction function. Fig. 3 is a plan view of the optical unit with shake correction function with the cover removed, as viewed from the object side. Fig. 4 is an exploded perspective view of the optical unit with shake correction function with the cover and the chassis removed.

As shown in fig. 1, the optical unit 1 with shake correction function includes a movable body 10 and a fixed body 11, the movable body 10 includes a camera module 2, and the fixed body 11 surrounds the movable body 10 from the outside. The fixed body 11 includes a frame-shaped housing 3 surrounding the movable body 10 from the outer peripheral side, a cover 4 fixed to the housing 3 from the object side, and a base 5 fixed to the housing 3 from the object side opposite thereto and covering the movable body from the object side opposite thereto. The optical unit 1 with the shake correction function includes a flexible printed circuit board 6 drawn out from the movable body 10 and a flexible printed circuit board 7 wound along the outer peripheral surface of the housing 3.

The optical unit 1 with a shake correction function is used for optical devices such as a mobile phone with a camera and a drive recorder, or optical devices such as a motion camera and a wearable camera mounted on a moving body such as a helmet, a bicycle, and a remote-controlled helicopter. In such an optical apparatus, if a shake of the optical apparatus is generated at the time of shooting, a disturbance is generated in the shot image. The optical unit 1 with shake correction function corrects the tilt of the camera module 2 based on the acceleration or angular velocity, the shake amount, and the like detected by a detection unit such as a gyroscope to avoid the tilt of the taken image.

The camera module 2 includes a lens 2a and an image pickup device 2b (see fig. 5 and 6) disposed on an optical axis L of the lens 2a. The optical unit 1 with a shake correction function performs shake correction by rotating the camera module 2 around the optical axis L of the lens 2a, around a first axis R1 orthogonal to the optical axis L, and around a second axis R2 orthogonal to the optical axis L and the first axis R1.

In the following description, three axes orthogonal to each other are referred to as an X-axis direction, a Y-axis direction, and a Z-axis direction. One side in the X-axis direction is defined as the-X direction, and the other side is defined as the + X direction. One side in the Y-axis direction is set as the-Y direction, and the other side is set as the + Y direction. One side in the Z-axis direction is set as the-Z direction, and the other side is set as the + Z direction. The Z-axis direction is the optical axis L direction. the-Z direction is the object opposite side of the camera module 2, and the + Z direction is the object side of the camera module 2. The first axis R1 and the second axis R2 are inclined at 45 degrees about the Z axis (about the optical axis) with respect to the X axis and the Y axis.

The optical unit 1 with shake correction function includes a rotation support mechanism 12 for rotatably supporting the movable body 10 about the Z axis and a gimbal mechanism 13. The gimbal mechanism 13 supports the rotation support mechanism 12 to be rotatable about the first axis R1, and supports the rotation support mechanism 12 to be rotatable about the second axis R2. The movable body 10 is supported by the fixed body 11 so as to be rotatable about the first axis R1 and about the second axis R2 via the rotation support mechanism 12 and the gimbal mechanism 13.

As shown in fig. 3, the gimbal mechanism 13 includes a gimbal frame 14 and a first connecting mechanism 15 that connects the gimbal frame 14 and the rotation support mechanism 12 to be rotatable about a first axis R1. The first connecting mechanisms 15 are provided on both sides of the gimbal frame 14 in the first axis R1 direction. The gimbal mechanism 13 includes a second connection mechanism 16 that connects the gimbal frame 14 and the fixed body 11 to be rotatable about the second axis R2. The second connection mechanisms 16 are provided on both sides of the gimbal frame 14 in the direction of the second axis R2.

The optical unit 1 with a shake correction function further includes a shake correction magnetic drive mechanism 20 for rotating the movable body 10 about the first axis R1 and about the second axis R2. As shown in fig. 3, the magnetic drive mechanism 20 for blur correction includes a first magnetic drive mechanism 21 for blur correction that generates a driving force about the X axis with respect to the movable body 10, and a second magnetic drive mechanism 22 for blur correction that generates a driving force about the Y axis with respect to the movable body 10. The first magnetic drive mechanism 21 for shake correction and the second magnetic drive mechanism 22 for shake correction are arranged in the circumferential direction around the Z axis. In this example, the first magnetic drive mechanism 21 for blur correction is arranged in the-X direction of the camera module 2. The second magnetic drive mechanism for blur correction 22 is disposed in the-Y direction of the camera module 2.

The movable body 10 rotates about the X axis and about the Y axis by combining the rotation about the first axis R1 and the rotation about the second axis R2. Thus, the optical unit 1 with the shake correction function performs pitch correction around the X axis and yaw correction around the Y axis.

The optical unit 1 with shake correction function further includes a rolling correction magnetic drive mechanism 23 for rotating the movable body 10 about the Z axis. As shown in fig. 3, the first shake correction magnetic drive mechanism 21, the second shake correction magnetic drive mechanism 22, and the roll correction magnetic drive mechanism 23 are arranged in the circumferential direction around the Z axis. In this example, the roll correction magnetic drive mechanism 23 is disposed in the + Y direction of the camera module 2. The roll correction magnetic drive mechanism 23 is positioned on the opposite side of the second shake correction magnetic drive mechanism 22 with the optical axis L therebetween.

(stationary body)

In the fixed body 11, the cover 4 and the base 5 are plate-shaped and made of nonmagnetic metal. Hooks 8 bent at a substantially right angle toward the housing 3 are formed on the outer peripheral edges of the cover 4 and the base 5. The case 3 is made of resin. The hook 8 is locked to a projection 9 provided on the outer peripheral surface of the housing 3. The gimbal mechanism 13 and the camera module 2 are disposed inside the opening 4a of the cover 4 and protrude from the cover 4 in the + Z direction.

The housing 3 includes a rectangular frame 18 surrounding the movable body 10 and the rotation support mechanism 12 from the outer peripheral side, and a rectangular wiring housing 19 disposed in the + X direction of the frame 18. The frame 18 includes a first side plate 181 and a second side plate 182 facing each other in the X direction, and a third side plate 183 and a fourth side plate 184 facing each other in the Y direction. The first side plate portion 181 is located in the-X direction of the second side plate portion 182. The third side plate 183 is located in the-Y direction of the fourth side plate 184.

As shown in fig. 4, the frame portion 18 includes a notch portion 185 formed by cutting an edge of the second side plate portion 182 in the-Z direction. The flexible printed board 6 connected to the image pickup device 2b is drawn out in the + X direction from the end of the movable body 10 in the-Z direction. The flexible printed board 6 is drawn out in the + X direction of the frame portion 18 through the cutout portion 185 and accommodated in the wiring accommodation portion 19.

The wiring accommodation portion 19 includes fifth and sixth

side plate portions

191 and 192 facing each other in the Y-axis direction, and a seventh side plate portion 193 facing the second side plate portion 182 of the frame 18 in the X-axis direction. The wiring housing 19 includes a notch 194 formed by cutting an edge of the seventh side plate 193 in the-Z direction. The flexible printed board 6 is passed through the wiring housing 19 in a shape folded back a plurality of times, and is drawn out to the outside of the wiring housing 19 through the cutout 194.

As shown in fig. 4, a first coil fixing hole 183a is provided in the third side plate 183 of the case 3. The first coil 21C is fixed in the first coil fixing hole 183a. The first side plate portion 181 of the housing 3 is provided with a second coil fixing hole 181a. The second coil 22C is fixed in the second coil fixing hole 181a. The first coil 21C and the second coil 22C are elliptical air-core coils that are long in the circumferential direction. In addition, a third coil fixing hole 184a is provided in the fourth side plate 184. The third coil 23C is disposed in the third coil fixing hole 184a. The third coil 23C is an air-core coil long in the Z-axis direction.

As shown in fig. 3, the first coil 21C fixed to the third side plate 183 and the first magnet 21M fixed to the side surface of the movable body 10 in the-Y direction face each other in the Y direction, and constitute a first magnetic drive mechanism 21 for blur correction. The second coil 22C fixed to the first side plate portion 181 and the second magnet 22M fixed to the side surface of the movable body 10 in the-X direction face each other in the X direction, and constitute a second shake correction magnetic drive mechanism 22. The third coil 23C fixed to the fourth side plate 184 and the third magnet 23M fixed to the + Y direction side surface of the movable body 10 face each other in the Y direction, and constitute a rolling correction magnetic drive mechanism 23.

The first coil 21C, the second coil 22C, and the third coil 23C are electrically connected to the flexible printed circuit board 7. The flexible printed board 7 is fixed to the outer peripheral surface of the frame 18. In this embodiment, the flexible printed circuit board 7 is wound in this order along the outer peripheral surfaces of the fourth side plate 184, the first side plate 181, and the third side plate 183 in the frame 18.

The magnetic plate 17 is fixed to the flexible printed circuit board 7 at two positions, i.e., a position overlapping the center of the first coil 21C and a position overlapping the center of the second coil 22C (see fig. 1 and 2). The magnetic plate 17 and the first magnet 21M overlapped with the first coil 21C constitute a magnetic spring for returning the movable body 10 to the reference angular position in the rotational direction around the X axis. In addition, the magnetic plate 17 and the second magnet 22M overlapping the second coil 22C constitute a magnetic spring for returning the movable body 10 to the reference angular position in the rotational direction about the Y axis. A swing position sensor and a rotation position sensor, not shown, are disposed on the flexible printed circuit board 7. The optical unit 1 with shake correction function acquires the angular positions of the movable body 10 in the rotational direction about the X axis, about the Y axis, and about the Z axis based on the outputs of these sensors.

(gimbal mechanism)

Fig. 5 and 6 are cross-sectional views of the optical unit with the shake correction function. Fig. 5 isbase:Sub>A sectional view taken atbase:Sub>A positionbase:Sub>A-base:Sub>A of fig. 2, and fig. 6 isbase:Sub>A sectional view taken atbase:Sub>A position B-B of fig. 2. Fig. 7 is an exploded perspective view of the gimbal frame 14, the first gimbal frame receiving part 151, and the second gimbal frame receiving part 162.

As shown in fig. 3 and 6, second connection mechanisms 16 that connect the gimbal frame 14 and the fixed body 11 to be rotatable about the second axis R2 are provided at diagonal positions in the second axis R2 direction of the frame portion 18, respectively. A second gimbal frame receiving member 162 is fixed to each of a pair of recesses 161 provided at diagonal positions in the second axis R2 direction of the frame portion 18. As shown in fig. 6 and 7, the second gimbal frame receiving member 162 includes a ball 163 and a second thrust receiving member 164 that fixes the ball 163. As shown in fig. 6, by fixing the second gimbal frame receiving member 162 to the recess 161, the position of the ball 163 on the second axis R2 is supported by the fixed body 11. When assembling the gimbal mechanism 13, the gimbal frame 14 is inserted into the inner peripheral side of the second gimbal frame receiving part 162 and is brought into point contact with the spherical body 163 on the second axis R2. Thereby, the second connecting mechanism 16 is constituted.

As shown in fig. 3 and 5, first connecting mechanisms 15 for connecting the gimbal frame 14 and the rotation support mechanism 12 to be rotatable about the first axis R1 are provided on both sides of the movable body 10 in the first axis R1 direction. The first connecting mechanism 15 includes a first gimbal frame receiving member 151 fixed to the rotation support mechanism 12 on both sides in the first axis R1 direction with respect to the movable body 10. As shown in fig. 5 and 7, the first gimbal frame receiving member 151 includes a spherical body 152 and a first thrust receiving member 153 that fixes the spherical body 152. By fixing the first thrust receiving member 153 to the rotation support mechanism 12, the position of the spherical body 152 on the first axis R1 is supported by the rotation support mechanism 12. When assembling the gimbal mechanism 13, the gimbal frame 14 is inserted into the inner peripheral side of the first gimbal frame receiving part 151 and is brought into point contact with the spherical body 152 on the first axis R1. Thereby, the first connection mechanism 15 is constituted.

The gimbal frame 14 is formed of a metal plate spring. As shown in fig. 5, 6, and 7, the gimbal frame 14 includes a gimbal frame main body portion 140 positioned in the + Z direction of the movable body 10, a pair of first shaft-side extensions 141 protruding from the gimbal frame main body portion 140 toward both sides in the first axis R1 direction and extending in the-Z direction, and a pair of second shaft-side extensions 142 protruding from the gimbal frame main body portion 140 toward both sides in the second axis R2 direction and extending in the-Z direction. The gimbal frame 14 includes an opening 143 that penetrates the center of the gimbal frame main body 140 in the Z-axis direction.

As shown in fig. 7, each of the pair of first shaft-side provision portions 141 is provided with a first shaft-side concave curved surface 144 that is concave toward the movable body 10 side toward the inner peripheral side in the first shaft R1 direction on the first shaft R1. The first axial-side extending portion 141 includes a pair of notches 145, and the pair of notches 145 are formed by cutting out edges on both sides in the circumferential direction in the + Z direction of the first axial-side concave curved surface 144. The first axial-side extending portion 141 includes a protruding portion 146 protruding in the-Z direction of the first axial-side concave curved surface 144 in a direction toward the outer peripheral side. Next, each of the pair of second shaft-side providing portions 142 is provided with a second shaft-side concave curved surface 147 that is concave toward the inner peripheral side toward the movable body 10 side in the second shaft R2 direction on the second shaft R2. The second shaft-side extension 142 includes a pair of notches 148 formed by cutting edges on both sides in the circumferential direction in the + Z direction of the second shaft-side concave curved surface 147.

As shown in fig. 7, the first thrust receiving member 153 includes a plate portion 154 extending in the Z-axis direction, a leg portion 155 bent from an end portion of the plate portion 154 in the-Z direction toward the movable body 10, and a pair of arm portions 156 bent from side edges on both sides of the plate portion 154 in the circumferential direction toward the movable body 10. The ball 152 is fixed to the plate portion 154 by welding. The first thrust receiving member 153 includes a hole 157 that penetrates the center of the corner of the connecting plate 154 and the leg 155. The front ends of the leg portion 155 and the pair of arm portions 156 are fixed to the rotation support mechanism 12 by welding. As will be described later, the rotation support mechanism 12 includes a pair of second extensions 64 extending in the-Z direction on both sides of the movable body 10 in the first axis R1 direction, and the distal ends of the leg portion 155 and the pair of arm portions 156 are fixed to the distal ends of the second extensions 64 by welding in the first gimbal frame receiving member 151.

When the gimbal mechanism 13 is assembled, the first shaft-side extending portion 141 of the gimbal frame 14 is bent toward the inner circumferential side and inserted into the inner circumferential side of the first gimbal frame receiving member 151. Thus, the first shaft-side extensions 141 are biased toward the outer peripheral side, so that the first shaft-side concave curved surfaces 144 of the first shaft-side extensions 141 and the spherical bodies 152 of the first gimbal frame receiving member 151 can maintain a contact state. The notch 145 of the first axial side extension 141 is disposed between the pair of arms 156, and the protrusion 146 is disposed in the hole 157 (see fig. 5). This prevents the gimbal frame 14 from being pulled out in the + Z direction from the first gimbal frame receiving member 151.

The second thrust receiving member 164 includes a plate portion 165 extending in the Z-axis direction, a leg portion 166 bent from an end portion of the plate portion 165 in the-Z direction toward the movable body 10, and a pair of arm portions 167 bent from side edges on both sides of the plate portion 165 in the circumferential direction toward the movable body 10. The ball 163 is fixed to the plate portion 165 by welding. Further, a leg bending portion 168 is provided which bends in the + Z direction from both circumferential ends of the leg 166. When the second thrust receiving member 164 is fixed to the recess 161 of the housing 3, the second thrust receiving member 164 is press-fitted into the recess 161 while the leg bent portion 168 is bent toward the center in the circumferential direction.

When the gimbal mechanism 13 is assembled, the second shaft side extension 142 of the gimbal frame 14 is bent toward the inner circumferential side and inserted into the inner circumferential side of the second gimbal frame receiving member 162. Thus, the second shaft-side extensions 142 are biased toward the outer peripheral side, and the second shaft-side concave curved surfaces 147 of the second shaft-side extensions 142 and the spherical body 163 of the second gimbal frame receiving member 162 can maintain a contact state. The notch 145 of the second shaft-side extension 142 is disposed between the pair of arms 156. This prevents the gimbal frame 14 from being pulled out in the + Z direction from the second gimbal frame receiving member 162.

(Movable body)

Fig. 8 is a perspective view of the movable body 10 and the rotation support mechanism 12 as viewed from the object side. Fig. 9 is an exploded perspective view of the movable body 10 and the rotation support mechanism 12. Fig. 10 is a perspective view of the movable body 10 and the rotation support mechanism 12 as viewed from the opposite side to the subject. As shown in fig. 8 and 9, the movable body 10 includes the camera module 2, a frame-shaped holder 24 that holds the camera module 2, and a first member 25 fixed to the holder 24. The holder 24 is made of resin, and the first member 25 is made of metal.

As shown in fig. 8 and 9, the first member 25 includes: a first annular plate portion 26 that surrounds the optical axis L and overlaps with the outer peripheral portion of the camera module 2 from the + Z direction; and a first extension portion 27 that protrudes from the first annular plate portion 26 to the outer circumferential side, is bent in the-Z direction at the outer circumferential side of the camera module 2, and is connected to the holder 24. In this embodiment, the rotation support mechanism 12 is disposed in a gap between the first annular plate portion 26 and the camera module 2 in the Z-axis direction (the optical axis L direction).

The first extending portion 27 is disposed at three positions in the-X direction, + Y direction, and-Y direction of the first annular plate portion 26. The angular positions at which the first extension 27 is disposed are the angular positions at which the first magnet 21M and the second magnet 22M of the shake correction magnetic drive mechanism 20 and the third magnet 23M of the roll correction magnetic drive mechanism 23 are disposed. The first extension portion 27 includes: a first extended portion first portion 28 extending from the first annular plate portion 26 to the outer peripheral side and bent in the-Z direction; and a rectangular first extending portion second portion 29 connected to the-Z direction front end of the first extending portion first portion 28 and having a circumferential width wider than that of the first extending portion first portion 28. The first extension second portion 29 is fixed to the holder 24.

The first member 25 includes an annular first rail member 50 surrounding the optical axis L and a first plate-like member 51 made of a metal plate and joined to the first rail member 50. The first plate-like member 51 is made of a magnetic metal. The first rail member 50 is composed of a non-magnetic metal. Further, the first rail member 50 may be a magnetic metal. The first rail member 50 is fitted into a circular first through hole 52 provided in the first plate-like member 51 and fixed to the first plate-like member 51 by welding. More specifically, the first rail member 50 and the first plate-like member 51 are welded together such that the opening edge of the first through hole 52 and the outer peripheral edge of the first rail member 50 are connected in the radial direction. Welding is performed at a plurality of locations equally angularly spaced about the Z-axis.

As shown in fig. 5 and 6, a first annular groove 53 is provided on an end surface of the first rail member 50 in the-Z direction. In this embodiment, the first annular groove 53 is formed by cutting. The first rail member 50 may be formed with the first annular groove 53 by a method other than cutting. For example, the first annular groove 53 may be formed by cold forging or press working. The first annular plate portion 26 has an inner peripheral portion formed by the first rail member 50 and an outer peripheral portion formed by the first plate-like member 51. Therefore, the first annular plate 26 includes a first annular groove 53 surrounding the optical axis L.

As shown in fig. 9, the camera module 2 includes a camera module main body portion 30A and a camera module cylindrical portion 30B protruding in the + Z direction from the center of the camera module main body portion 30A. The camera module cylindrical portion 30B accommodates a lens 2a (see fig. 5 and 6). The holder 24 surrounds the camera module main body 30A from the outer peripheral side. The camera module cylindrical portion 30B protrudes in the + Z direction from a circular hole 26a provided in the center of the first annular plate portion 26, and is disposed in the opening 143 of the gimbal frame 14.

The camera module main body 30A and the holder 24 have a generally octagonal outline shape when viewed from the + Z direction. The holder 24 includes first and

second side walls

31 and 32 extending in parallel in the Y direction, and third and

fourth side walls

33 and 34 extending in parallel in the X direction. The first side wall 31 is located in the-X direction of the second side wall 32. The third side wall 33 is located in the-Y direction of the fourth side wall 34. A notch 32a is provided at the end edge of the second side wall 32 in the-Z direction. As shown in fig. 4, the flexible printed board 6 connected to the image pickup device 2b is drawn out from the end of the camera module 2 in the-Z direction through the notch 32a in the + X direction of the movable body 10.

The retainer 24 includes fifth and

sixth side walls

35, 36 located diagonally to the first axis R1 direction, and seventh and

eighth side walls

37, 38 located diagonally to the second axis R2 direction. The fifth side wall 35 is located in the-X direction of the sixth side wall 36. The seventh sidewall 37 is located in the-X direction of the eighth sidewall 38. A stopper protrusion 39 protruding in the + Z direction is formed on the end surfaces of the fifth side wall 35, the sixth side wall 36, the seventh side wall 37, and the eighth side wall 38 in the + Z direction.

The first magnet 21M is fixed to the first side wall 31 of the holder 24, and the second magnet 22M is fixed to the third side wall 33. The first magnet 21M and the second magnet 22M are magnetized to have two magnetic poles in the Z-axis direction. The magnetization polarization lines of the first magnet 21M and the second magnet 22M extend in the circumferential direction. The first magnet 21M and the second magnet 22M are arranged with the same pole facing the Z-axis direction. A third magnet 23M is fixed to the fourth side wall 34 of the holder 24. The third magnet 23M is magnetized to a magnetic pole in the circumferential direction. The first magnet 21M, the second magnet 22M, and the third magnet 23M are arranged in the circumferential direction around the optical axis L. The third magnet 23M is disposed on the opposite side of the optical axis L from the second magnet 22M.

As shown in fig. 9, a recess 40 recessed inward on the outer peripheral surface of the first side wall 31, the third side wall 33, and the fourth side wall 34 of the holder 24 is formed, and the first magnet 21M, the second magnet 22M, and the third magnet 23M are accommodated in the recess 40. The first magnet 21M, the second magnet 22M, and the third magnet 23M are positioned in the Z-axis direction by abutting from the + Z direction against a bottom surface 41 provided at an end of each recess 40 in the-Z direction.

The three recessed portions 40 are formed with groove portions 42 on the inner surfaces of both sides in the circumferential direction. As shown in fig. 3 and 8, the first extending portion second portion 29 provided at the-Z direction distal end of the first extending portion 27 is inserted into each recess 40. The first extension second portion 29 is inserted into the groove 42 at both ends in the circumferential direction and fixed to the respective recesses 40 by an adhesive. The first extension second portion 29 is inserted radially inward of the first magnet 21M, the second magnet 22M, and the third magnet 23M. The first extension second portion 29 is made of a magnetic metal, and therefore functions as a yoke portion for each magnet.

(rotation support mechanism)

The rotation support mechanism 12 includes a second member 55 having a first annular groove 53 and a second annular groove 54, the first annular groove 53 being provided on the movable body 10 coaxially with the optical axis L, the second annular groove 54 facing the first annular groove 53 in the Z-axis direction. The rotation support mechanism 12 includes a plurality of rolling elements 56 that are inserted into the first annular groove 53 and the second annular groove 54 and roll between the movable body 10 and the second member 55, and a cage 57 that holds the rolling elements 56 in a ring shape so as to be capable of rolling. The cage 57 includes a plurality of ball holding holes 58 that respectively hold the plurality of rolling elements 56 so as to be capable of rolling. The rotation support mechanism 12 further includes a pressurizing mechanism 59 that applies a force to bring the first annular groove 53 and the second annular groove 54 close to each other in the Z-axis direction.

As shown in fig. 9, the second member 55 includes a ring-shaped second rail member 60 surrounding the optical axis L and a second plate-like member 61 made of a metal plate to which the second rail member 60 is joined. The second rail member 60 is fitted into a circular second through hole 62 provided in the second plate-like member 61, and is fixed to the second plate-like member 61 by welding. More specifically, the second rail member 60 and the second plate-like member 61 are welded together from the-Z direction at the opening edge of the second through hole 62 and the outer peripheral edge of the second rail member 60. Welding is performed at a plurality of positions equally angularly spaced around the Z-axis.

The second annular groove 54 is provided on the + Z-direction end surface of the second rail member 60. In this embodiment, the second annular groove 54 is formed by cutting. The second rail member 60 and the second plate-like member 61 are each made of a non-magnetic metal. Further, the second rail member 60 may also be a magnetic metal. The second track member 60 and the first track member 50 are the same member. As shown in fig. 5 and 6, the second rail member 60 and the first rail member 50 are coaxially arranged, and the first annular groove 53 and the second annular groove 54 face each other in the Z-axis direction.

The rolling elements 56 are made of metal or ceramic. The retainer 57 is made of resin. The retainer 57 is located between the first rail member 50 and the second rail member 60 in the Z-axis direction. In the present embodiment, the rolling elements 56 are balls. The rotation support mechanism 12 includes six rolling elements 56, and the cage 57 includes six ball holding holes 58 provided at equal angular intervals. The rolling elements 56 are rollably held inside the ball holding holes 58 and project from the cage 57 in the-Z direction and the + Z direction.

The second member 55 includes a second annular plate portion 63 surrounding the optical axis L, a pair of second extending portions 64 protruding from the second annular plate portion 63 on both sides in the first axis R1 direction, and a pair of second protruding plate portions 65 protruding from the second annular plate portion 63 on both sides in the second axis R2 direction. The second annular plate portion 63 has an inner peripheral portion formed by the second rail member 60 and an outer peripheral portion formed by the second plate-like member 61. As shown in fig. 5, 6, and 8, the second annular plate portion 63 and the retainer 57 are disposed in a gap between the first annular plate portion 26 of the first member 25 and the camera module main body portion 30A in the direction of the optical axis L.

The pair of second extending portions 64 includes a second extending portion first portion 66 extending from the second annular plate portion 63 in the first axis R1 direction and a second extending portion second portion 67 extending in the Z axis direction on the outer peripheral side of the movable body 10. As shown in fig. 5, the second extending portion second portion 67 faces the movable body 10 with a slight gap outside the movable body 10 in the first axis R1 direction. As shown in fig. 5 and 8, in each second extending portion second portion 67, the first gimbal frame receiving member 151 is fixed to the surface opposite to the movable body 10. The first gimbal frame receiving member 151 is fixed to the second extension second portion 67 by welding the front ends of the pair of arm portions 156 and the leg portions 155 to the second extension second portion 67.

As shown in fig. 8 and 9, the pressing mechanism 59 includes pressing magnets 68 disposed at four positions around the optical axis L of the second member 55, and first protruding plate portions 69 provided at four positions around the optical axis L of the first member 25. The pressing magnet 68 is fixed to four portions of the pair of second extending portion first portions 66 and the pair of second protruding plate portions 65. Each of the pressurizing magnets 68 is magnetized to have two magnetic poles in the circumferential direction. The first projecting plate portions 69 project from the first annular plate portion 26 in four directions, i.e., both sides in the first axis R1 direction and both sides in the second axis R2 direction. When the movable body 10 and the rotation support mechanism 12 are assembled, each of the four pressing magnets 68 disposed on the second member 55 overlaps the first protruding plate portions 69 provided at four locations on the movable body 10 in the optical axis L direction.

The first protruding plate portion 69 is made of a magnetic metal. Therefore, the first projecting plate portion 69, which overlaps with each of the pressing magnets 68 in the direction of the optical axis L, is attracted to the pressing magnet 68 side by the magnetic attractive force of the pressing magnet 68. Thus, the pressing mechanism 59 applies forces to bring the first annular groove 53 and the second annular groove 54 closer to each other in the Z-axis direction at four points at equal angular intervals around the optical axis L. The movable body 10 is attracted to the second member 55 by the magnetic attraction force of the pressurizing mechanism 59, and is supported by the second member 55 in a state of being rotatable about the Z axis.

The pair of second extending portions 64 and the pair of second protruding plate portions 65 provided on the second member 55 face the stopper convex portions 39 provided on the holder 24 in the optical axis L direction. As shown in fig. 5 and 6, the + Z direction distal end of the stopper projection 39 protrudes in the + Z direction beyond the + Z direction end face of the camera module main body 30A. Therefore, the movement range of the second member 55 in the-Z direction is restricted by the stopper protrusion 39.

As shown in fig. 8, the first side wall 31, the second side wall 32, the third side wall 33, and the fourth side wall 34 are lower than the camera module main body 30A in the Z-axis direction. As shown in fig. 10, the holder 24 includes a convex portion 43 protruding in the-Z direction from the end surfaces in the-Z direction of the first side wall 31, the third side wall 33, and the fourth side wall 34. The projection 43 is located at the center in the circumferential direction of the first, third, and

fourth side walls

31, 33, and 34. The convex portion 43 protrudes in the-Z direction from the bottom surface (surface facing in the-Z direction) of the camera module main body 30A. Therefore, when the entire movable body 10 is largely moved in the Z-axis direction by the impact of falling or the like, the convex portion 43 collides with the fixed body 11 before the camera module main body portion 30A.

The convex portions 43 are formed at three of the side walls (the first side wall 31, the third side wall 33, and the fourth side wall 34) arranged at the intermediate angular positions between the first axis R1 direction and the second axis R2 direction, among the side walls of the eight locations arranged in the circumferential direction around the camera module main body portion 30A. The convex portion 43 is formed at the center in the circumferential direction of the first, third, and

fourth side walls

31, 33, and 34. Therefore, in the holder 24, the convex portion 43 is formed at a position where the distance from the optical axis L is minimum and the amount of movement in the Z-axis direction is minimum when the movable body 10 swings.

As shown in fig. 10, the side surfaces 43a on both sides in the circumferential direction of the convex portion 43 are tapered surfaces inclined in the-Z direction as they go toward the center in the circumferential direction. Therefore, the convex portion 43 has a shape having a large width in the circumferential direction and high strength, but has a shape in which the amount of projection of the portion having a larger movement amount in the Z-axis direction is smaller when the movable body 10 swings. Therefore, it is not necessary to increase the gap between the movable body 10 and the fixed body 11 in the optical axis L direction in order to avoid collision of the convex portion 43 with the fixed body 11 when the movable body 10 is swung.

As shown in fig. 10, the end surfaces in the-Z direction of the fifth side wall 35, the sixth side wall 36, the seventh side wall 37, and the eighth side wall 38 of the holder 24 are located in the + Z direction with respect to the bottom surface of the camera module main body 30A. Therefore, the outer shape of the movable body 10 is a shape in which the end portions in the-Z direction of the diagonal portion in the first axis R1 direction and the diagonal portion in the second axis R2 direction are recessed in the + Z direction. Since the diagonal portion in the first axis R1 direction and the diagonal portion in the second axis R2 direction of the movable body 10 are the portions farthest from the optical axis L, by making the portions in a shape in which the portions are notched in the Z-axis direction, the movable space of the movable body 10 in the Z-axis direction when the movable body 10 swings about the first axis R1 and about the second axis R2 can be reduced.

The rotation support mechanism 12 includes a rotation restriction mechanism 70 that restricts the range of rotation of the movable body 10 about the optical axis L. As shown in fig. 8, the rotation restricting mechanism 70 includes a first rotation restricting portion 71 provided on the first member 25 and a second rotation restricting portion 72 provided on the second member 55. The first rotation restricting portion 71 protrudes from the first annular plate portion 26 toward the outer peripheral side and is curved in the-Z direction. The first rotation restricting portion 71 is fixed at the front end in the-Z direction to the second side wall 32 of the holder 24.

The second rotation restricting portion 72 protrudes from the second annular plate portion 63 toward the outer peripheral side. A notch 73 having a larger circumferential width than the second rotation restriction portion 72 is provided at the circumferential center of the first rotation restriction portion 71, and the second rotation restriction portion 72 is disposed in the notch 73. Therefore, the first rotation restricting portion 71 surrounds both sides of the second rotation restricting portion 72 in the circumferential direction. The first rotation restricting portion 71 and the second rotation restricting portion 72 collide with each other, thereby restricting the range of rotation of the movable body 10 about the optical axis L with respect to the second member 55.

(main action and Effect of the present embodiment)

As described above, the optical unit 1 with shake correction function according to the present embodiment includes: a movable body 10, the movable body 10 including a camera module 2; a rotation support mechanism 12 for supporting the movable body 10 to be rotatable about the optical axis L of the camera module 2 by the rotation support mechanism 12; a gimbal mechanism 13 that supports the rotation support mechanism 12 so as to be rotatable about a first axis R1 intersecting the optical axis L, and supports the rotation support mechanism 12 so as to be rotatable about a second axis R2 intersecting the optical axis L and the first axis R1; and a fixed body 11, wherein the fixed body 11 supports the movable body 10 via a gimbal mechanism 13 and a rotation support mechanism 12. The movable body 10 includes a resin holder 24 surrounding the outer periphery of the camera module 2, and a metal first member 25 fixed to the holder 24. The first member 25 includes a first annular plate portion 26 surrounding the optical axis L and overlapping the camera module 2 when viewed in the direction of the optical axis L, and a first extension portion 27 connecting the first annular plate portion 26 and the holder 24. The rotation support mechanism 12 includes: a first annular groove 53, the first annular groove 53 being formed in the first annular plate portion 26; a second member 55, the second member 55 including a second annular plate portion 63 in which a second annular groove 54 is formed so as to face the first annular groove 53 in the optical axis L direction, and being supported by the gimbal mechanism 13 so as to be rotatable about the first axis R1; and a plurality of rolling elements 56, wherein the plurality of rolling elements 56 are inserted into the first annular groove 53 and the second annular groove 54, and roll between the first annular plate portion 26 and the second annular plate portion 63. A shake correction magnet (a first magnet 21M, a second magnet 22M) of the shake correction magnetic drive mechanism 20 for rotating the movable body 10 about the first axis R1 and the second axis R2 is fixed to the holder 24. The first extension 27 is made of a magnetic metal and fixed to the inner peripheral side of the shake correction magnet.

In this embodiment, the movable body 10 includes a resin-made holder 24 surrounding the outer periphery of the camera module 2 and a metal first member 25 fixed to the holder 24, and the first member 25 includes a first annular plate 26 surrounding the optical axis L and overlapping the camera module 2 when viewed from the optical axis L direction, and a first magnetic-metal-made extension 27 connecting the first annular plate 26 and the holder 24 and fixed to the inner periphery of the shake correction magnet. Therefore, since the orbit of the rolling element 56 of the rotation support mechanism 12 and the yoke portion of the magnet with respect to the shake correction magnetic drive mechanism 20 are integrated with the first member 25, the number of parts can be reduced, and the assembling property and cost reduction of the movable body 10 and the rotation support mechanism 12 can be achieved. Further, the yoke portion is integrated with the first member 25, so that the positional accuracy of the yoke portion can be improved. Further, by making the holder 24 of resin, strength can be ensured even if an end plate portion protruding to the inner peripheral side is not provided at the end in the optical axis L direction as in the case of the holder 24 made of metal plate. Therefore, the height of the movable body 10 in the optical axis L direction can be reduced.

In this embodiment, the magnetic drive mechanism 20 for blur correction includes a first magnetic drive mechanism 21 for blur correction that rotates the movable body 10 about the first axis R1 and a second magnetic drive mechanism 22 for blur correction that rotates the movable body 10 about the second axis R2. The shake correction magnet includes a first magnet 21M of the first shake correction magnetic drive mechanism 21 and a second magnet 22M of the second shake correction magnetic drive mechanism 22. A third magnet 23M of the roll correction magnetic drive mechanism 23 for rotating the movable body 10 about the optical axis L is fixed to the holder 24, the first magnet 21M, the second magnet 22M, and the third magnet 23M are arranged in the circumferential direction about the optical axis L, and the first extension 27 is fixed to each of the inner circumferential side of the first magnet 21M, the inner circumferential side of the second magnet 22M, and the inner circumferential side of the third magnet 23M. Therefore, since all the yoke portions of the magnets of the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23 are integrated with the first member 25, the number of parts can be reduced, and the ease of assembly of the movable body 10 and the rotation support mechanism 12 can be improved and the cost can be reduced. In addition, the positional accuracy of the yoke portion can be improved.

In this embodiment, the second member 55 includes a pair of second extending portions 64 that protrude from the second annular plate portion 63 on both sides in the first axis R1 direction and a pair of second protruding plate portions 65 that protrude from the second annular plate portion 63 on both sides in the second axis R2 direction, and the pair of second extending portions 64 is connected to the gimbal mechanism 13. The second annular plate portion 63 is disposed in a gap between the first annular plate portion 26 and the camera module 2 in the direction of the optical axis L. At a diagonal position in the first axis R1 direction and a diagonal position in the second axis R2 direction of the holder 24, a stopper projection facing the second member 55 in the optical axis L direction is provided. In such a configuration, the first annular plate portion 26 functions as a stopper member for restricting the second annular plate portion 63 from coming off. Therefore, since it is not necessary to additionally overlap the stopper member arranged to overlap the second annular plate portion 63 in the optical axis L direction, the height of the rotation support mechanism 12 in the optical axis L direction can be reduced. This can reduce the height of the optical unit 1 with the shake correction function in the direction of the optical axis L. Further, the second annular plate portion 63 provided in the second member 55 can be restricted from separating from the first annular plate portion 26 by the stopper projection. Further, since the retainer 24 is made of resin, a complicated uneven shape is more easily formed than in the case of a metal plate. Therefore, the retainer 24 having the stopper protrusion is easily manufactured.

In this embodiment, the first annular plate portion 26 and the second annular plate portion 63 overlap the camera module 2 from the + Z direction (i.e., one side in the direction of the optical axis L). The end portions in the-Z direction (i.e., the other side in the optical axis L direction) of the diagonal portion in the first axis R1 direction of the holder 24 and the diagonal portion in the second axis R2 direction of the holder 24 are recessed in the + Z direction from the camera module 2. Accordingly, since the height of the space in which the movable body 10 moves when the movable body 10 swings about the first axis R1 and the second axis R2 in the direction of the optical axis L can be reduced, the product height of the optical unit 1 with a shake correction function in the direction of the optical axis L can be reduced. Further, since the retainer 24 is made of resin, a complicated uneven shape is more easily formed than that made of a metal plate. Therefore, the cage 24 having a recessed shape at the diagonal portion in the first axis R1 direction and the diagonal portion in the second axis R2 direction can be easily manufactured.

The holder 24 of the present embodiment includes a plurality of side walls (first to eighth side walls 31 to 38) arranged in the circumferential direction around the camera module 2. Of the side walls, three of the four side walls (the first side wall 31, the third side wall 33, and the fourth side wall 34) disposed at angular positions intermediate in the first axis R1 direction and the second axis R2 direction are provided with a convex portion 43 protruding toward the other side in the optical axis L direction than the camera module 2. Accordingly, in the case where the movable body 10 collides with the fixed body 11 due to a drop impact, since the impact is applied to the convex portion 43, it is possible to avoid the impact from being directly applied to the camera module 2. The retainer may have a shape in which the convex portion 43 is provided at least one position at an intermediate angular position between the first axis R1 direction and the second axis R2 direction.

In this embodiment, the convex portion 43 is disposed at the center in the circumferential direction of each side wall, and the convex portion 43 is disposed at a position of the holder 24 where the distance from the optical axis L is smallest, in other words, at a position where the amount of movement in the optical axis L direction is smallest when the movable body 10 swings. Therefore, the clearance in the optical axis L direction between the movable body 10 and the fixed body 11, which is required to avoid the collision of the convex portion 43 with the fixed body 11 when the movable body 10 is swung, is small. Thereby, it is possible to avoid the product height of the optical unit with shake correction function in the optical axis L direction from becoming large due to the provision of the convex portion 43.

In this embodiment, the side surfaces 43a on both sides of the convex portion 43 in the circumferential direction are tapered surfaces inclined in the direction toward the other side in the optical axis L direction as they go toward the center of the convex portion 43 in the circumferential direction. Therefore, the convex portion 43 has a large circumferential width at the base end portion continuous with the side wall, and thus has high strength. The tapered shape of the side surfaces 43a on both sides in the circumferential direction is a shape in which the amount of protrusion of the portion increases as the amount of movement in the optical axis L direction when the movable body 10 swings. Therefore, the clearance in the optical axis L direction between the movable body 10 and the fixed body 11, which is required to avoid the collision of the convex portion 43 with the fixed body 11 when the movable body 10 is swung, is small. Therefore, it is possible to avoid the product height of the optical unit with shake correction function in the optical axis L direction from becoming large due to the provision of the convex portion 43.

In this embodiment, the rotation support mechanism 12 includes a pressurizing mechanism 59 that applies a force to bring the first annular groove 53 and the second annular groove 54 close to each other in the direction of the optical axis L. The pressurizing mechanism 59 includes a first projecting plate portion 69 projecting from the first annular plate portion 26 toward the outer peripheral side, and a pressurizing magnet 68 fixed to a part of the second member 55 in the circumferential direction around the optical axis L. The first protruding plate portion 69 is made of a magnetic metal and is attracted by the pressurizing magnet 68. With this configuration, since the parts of the pressing mechanism 59 can be integrated with the first member 25, the number of parts can be reduced, and the assembling property can be improved. Further, by attaching the pressing magnet 68 to the second member 55 that rotates relative to the movable body 10 and providing the first projecting plate portion 69 that is attracted by the pressing magnet 68 to the movable body 10, it is possible to avoid the rotational position of the first projecting plate portion 69 from being displaced by the attraction of the magnets of the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23 attached to the movable body 10. Therefore, the pressurizing mechanism 59 can be prevented from being disturbed by the shake correction magnetic drive mechanism 20 and the roll correction magnetic drive mechanism 23. In addition, the angular position of the movable body 10 about the optical axis L can be regulated by the pressurizing mechanism 59.

In this embodiment, the rotation restricting mechanism 70 is provided for restricting the range of rotation of the movable body 10 about the optical axis L, and the rotation restricting mechanism 70 includes a first rotation restricting portion 71 formed on the first member 25 and a second rotation restricting portion 72 formed on the second member 55. The first rotation restricting portion 71 surrounds both sides of the second rotation restricting portion 72 in the circumferential direction. With this configuration, the rotation restricting mechanism 70 can be completed between the first member 25 and the second member 55, and the rotation restricting mechanism 70 can be configured without a stopper member overlapping the first member 25 and the second member 55 in the direction of the optical axis L. Therefore, the height of the rotation support mechanism 12 in the direction of the optical axis L can be reduced. In addition, since the rotation restricting mechanism 70 can be constituted with a small number of parts, a decrease in the dimensional accuracy of the rotation restricting mechanism 70 due to the accumulation of part tolerances can be suppressed. Therefore, the rotation range of the movable body 10 can be restricted with high accuracy.

In this embodiment, the first rotation restricting portion 71 extends from the first annular plate portion 26 to the outer circumferential side and is fixed to the holder 24, and the second rotation restricting portion 72 is disposed in a cutout portion formed by cutting out a circumferential central portion of the first rotation restricting portion 71. Thus, since the connection portion connecting the first annular plate portion 26 and the holder 24 can be used as the first rotation restricting portion 71, the shape of the first member 25 can be simplified.

(modification example)

(1) In the above-described embodiment, the first rotation restricting portion 71 is configured to surround both sides of the second rotation restricting portion 72 in the circumferential direction, but the second rotation restricting portion 72 may be configured to surround both sides of the first rotation restricting portion 71 in the circumferential direction. For example, a notch 73 is formed in the center of the second rotation restricting portion 72 in the circumferential direction, and the first rotation restricting portion 71 is disposed in the notch 73. That is, the rotation restricting mechanism 70 may be configured such that one of the first rotation restricting portion 71 and the second rotation restricting portion 72 surrounds both sides of the other of the first rotation restricting portion 71 and the second rotation restricting portion 72 in the circumferential direction.

(2) In the above-described embodiment, the first rotation restricting portion 71 is provided on the first member 25, but a configuration may be adopted in which the first rotation restricting portion 71 is provided on the holder 24. For example, a configuration may be adopted in which a protrusion protruding in the + Z direction is formed on the + Z direction end face of the holder 24 and collides with the second rotation restricting portion 72 in the circumferential direction to restrict the rotation of the movable body 10. That is, the rotation restricting mechanism 70 may be configured to include a first rotation restricting portion 71 formed on the first member 25 or the holder 24 and a second rotation restricting portion 72 extending from the second annular plate portion 63 to the outer circumferential side.

(3) In the above embodiment, the pressurizing mechanism 59 is provided at four locations around the optical axis L, but may be provided at two locations on opposite sides of the optical axis L.

(other embodiments)

(1) In the above-described embodiment, the first annular plate portion 26 is a separate component (the first rail member 50) from the first plate-like member 51 at the portion where the first annular groove 53 is formed, but the first rail member 50 and the first plate-like member 51 may be integrated. That is, the first member 25 may be a single component including the first rail portion provided with the first annular groove 53 and the first plate-like portion extending from the first rail portion to the outer circumferential side. Similarly, the second member 55 may be a single component including a second rail portion provided with the second annular groove 54 and a second plate-like portion extending from the second rail portion to the outer circumferential side. In this case, the first annular groove 53 and the second annular groove 54 can be formed by a machining method such as cold forging, press working, or cutting.

(2) In the above-described embodiment, the rotation support mechanism 12 is configured such that the second annular plate portion 63 of the second member 55 is disposed in the gap in the optical axis L direction between the first annular plate portion 26 of the first member 25 constituting the movable body 10 and the camera module 2, but a configuration may be adopted in which the arrangement of the first annular plate portion 26 and the second annular plate portion 63 in the optical axis L direction is reversed.

Claims

1. An optical unit with a shake correction function, comprising:

a movable body provided with a camera module;

a rotation support mechanism that supports the movable body so as to be rotatable around an optical axis of the camera module;

a gimbal mechanism that supports the rotation support mechanism so as to be rotatable about a first axis that intersects the optical axis and that supports the rotation support mechanism so as to be rotatable about a second axis that intersects the optical axis and the first axis; and

a fixed body that supports the movable body via the gimbal mechanism and the rotation support mechanism,

the movable body includes a resin holder surrounding an outer peripheral side of the camera module and a metal first member fixed to the holder,

the first member includes a first annular plate portion that surrounds the optical axis and overlaps the camera module when viewed in the optical axis direction, and a first extending portion that connects the first annular plate portion and the holder,

the rotation support mechanism includes:

a first annular groove formed in the first annular plate portion;

a second member that includes a second annular plate portion in which a second annular groove is formed that faces the first annular groove in the optical axis direction, and that is supported by the gimbal mechanism so as to be rotatable about the first axis; and

a plurality of rolling elements inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion,

a shake correction magnet of a shake correction magnetic drive mechanism for rotating the movable body about the first axis and about the second axis is fixed to the holder,

the first extension portion is made of a magnetic metal and fixed to an inner peripheral side of the shake correction magnet.

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

the magnetic drive mechanism for shake correction includes a first magnetic drive mechanism for shake correction for rotating the movable body about the first axis and a second magnetic drive mechanism for shake correction for rotating the movable body about the second axis,

the shake correction magnet includes a first magnet of the first shake correction magnetic drive mechanism and a second magnet of the second shake correction magnetic drive mechanism,

a third magnet of a magnetic drive mechanism for roll correction for rotating the movable body around the optical axis is fixed to the holder,

the first magnet, the second magnet, and the third magnet are arranged in a circumferential direction around the optical axis,

the first extending portion is fixed to each of positions on an inner peripheral side of the first magnet, an inner peripheral side of the second magnet, and an inner peripheral side of the third magnet.

3. The optical unit with shake correcting function according to claim 1 or 2,

the second member includes a pair of second extending portions protruding from the second annular plate portion to both sides in the first axial direction and a pair of second protruding plate portions protruding from the second annular plate portion to both sides in the second axial direction, the pair of second extending portions being connected to the gimbal mechanism,

the second annular plate portion is disposed in a gap in the optical axis direction between the first annular plate portion and the camera module,

a stopper protrusion facing the second member in the optical axis direction is provided at a diagonal position in the first axis direction and a diagonal position in the second axis direction of the holder.

4. The optical unit with a shake correcting function according to any one of claims 1 to 3,

the first annular plate portion and the second annular plate portion overlap the camera module from one side in the optical axis direction,

an end portion of the holder on the other side in the optical axis direction of the diagonal portion in the first axis direction and the diagonal portion in the second axis direction is recessed more than the camera module on the one side in the optical axis direction.

5. The optical unit with shake correcting function according to any one of claims 1 to 4,

the holder has a plurality of side walls arranged circumferentially around the camera module,

at least one of the side walls disposed at an intermediate angular position between the first axial direction and the second axial direction among the plurality of side walls is provided with a convex portion that protrudes further toward the other side in the optical axis direction than the camera module.

6. An optical unit with a shake correcting function according to claim 5,

the projection is disposed at the center of the sidewall in the circumferential direction.

7. The optical unit with a shake correcting function according to claim 6,

the side surfaces on both sides in the circumferential direction of the convex portion are tapered surfaces inclined in a direction toward the other side in the optical axis direction as they go toward the center in the circumferential direction of the convex portion.

8. The optical unit with shake correcting function according to any one of claims 1 to 7,

the rotation support mechanism includes a pressurizing mechanism that applies a force to bring the first annular groove and the second annular groove closer to each other in the optical axis direction,

the pressing mechanism includes a first protruding plate portion protruding from the first annular plate portion toward an outer peripheral side, and a pressing magnet fixed to a portion of the second member in a circumferential direction around the optical axis,

the first protruding plate portion is made of a magnetic metal and is attracted by the pressurizing magnet.

9. The optical unit with a shake correcting function according to any one of claims 1 to 8,

a rotation limiting mechanism that limits a rotation range of the movable body around the optical axis,

the rotation restricting mechanism includes:

a first rotation restricting portion formed on the first member or the holder; and

a second rotation restricting portion formed on the second member,

one of the first rotation restricting portion and the second rotation restricting portion surrounds both sides of the other of the first rotation restricting portion and the second rotation restricting portion in the circumferential direction.

10. The optical unit with shake correcting function according to claim 9,

the first rotation restricting portion extends from the first annular plate portion toward an outer peripheral side and is fixed to the holder,

the second rotation restriction portion is disposed in a cutout portion formed by cutting out a circumferential central portion of the first rotation restriction portion.