CN114675470A

CN114675470A - Optical unit with shake correction function

Info

Publication number: CN114675470A
Application number: CN202111579173.XA
Authority: CN
Inventors: 笠原章吾
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2020-12-24
Filing date: 2021-12-22
Publication date: 2022-06-28
Anticipated expiration: 2041-12-22
Also published as: CN114675470B; JP2022100782A

Abstract

An optical unit with a shake correction function for rotating a movable body about an optical axis, wherein the height of the optical unit in the direction of the optical axis is reduced. The optical unit with a shake correction function has a rotation support mechanism (12) for rotatably supporting a movable body (10) around an optical axis L, and a gimbal mechanism (13) for connecting the rotation support mechanism and a fixed body (11). The rotation support mechanism is provided with a first annular groove (53) formed in the first member, a second member in which a second annular groove is formed so as to face the first annular groove in the direction of the optical axis L, and a rolling element (56) inserted into the first annular groove and the second annular groove (54). The second member (55) is supported by a gimbal mechanism. The first member (25) is provided with a first rail member (50) in which a first annular groove is formed, and a first through-hole (52) into which the first rail member is fitted. The second member includes a second rail member (60) having a second annular groove formed therein and a second through hole (62) into which the second rail member is fitted.

Description

Optical unit with shake correction function

Technical Field

The present invention relates to an optical unit with a shake correction function that corrects 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 orthogonal to the optical axis, and about a second axis orthogonal to 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 to be rotatable 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 surrounding a 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 magnetic drive mechanism for swinging the camera module in the movable body around the first axis and around the second axis; 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 problem 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 product in the optical axis direction is increased by providing the rotation support mechanism, and it is difficult to reduce the thickness of the product in the optical axis direction as a whole. 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 rotation support mechanism of Japanese patent No. 2020-: 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.

However, in the rotation support mechanism of japanese patent No. 2020-36404, two rails holding rolling elements face each other in the optical axis direction, a sheet metal roller connected to a gimbal frame overlaps the object side of the two rails, and a stopper member made of a metal plate overlaps the object side of the sheet metal roller. When an impact is applied, the stopper member prevents the sheet roller from falling off. In such a configuration, since many components are overlapped in the optical axis direction to constitute the rotation support mechanism, the height of the rotation support mechanism in the optical axis direction is high. Therefore, it is necessary to secure a large arrangement space of the rotation support mechanism between the camera module and the gimbal frame, so that the product height in the optical axis direction increases.

In view of these points, an object of the present invention is to reduce the height of a rotation support mechanism in the optical axis direction in an optical unit with a shake correction function that rotates a movable body around the optical axis.

Technical scheme for solving technical problems

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 rotatably about a first axis intersecting the optical axis and supports the rotation support mechanism rotatably about a second axis intersecting 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 rotation support mechanism includes: a first rail member formed with a first annular groove around the optical axis and overlapping the camera module when viewed from the optical axis direction; a second rail member in which a second annular groove is formed so as to face the first annular groove in the optical axis direction; and a plurality of rolling elements that are inserted into the first annular groove and the second annular groove and roll between the first rail member and the second rail member, wherein the movable body includes a first member that includes the first rail member and a first through hole into which the first rail member is fitted, and a second member that is fitted into a second through hole provided in a second member that is supported by the gimbal mechanism so as to be rotatable about the first axis.

According to the present invention, the rotation support mechanism that supports the movable body so as to be rotatable about the optical axis includes the first rail member and the second rail member that overlap in the optical axis direction. By forming the part of the rail provided with the annular groove into a component in this manner, the component shape can be simplified, and the component cost can be reduced. Further, since the first rail member is fitted inside the first through hole of the first member constituting the movable body and the second rail member is fitted inside the second through hole of the second member supported by the gimbal mechanism, the number of components to be overlapped in the optical axis direction is small compared to a structure in which the rail members are overlapped and joined to the edges of the through holes. Therefore, the height of the rotation support mechanism in the optical axis direction can be reduced. This can reduce the product height of the optical unit with the shake correction function in the optical axis direction.

In the present invention, it is preferable that the first rail member and the second rail member are the same member. In this way, since the parts can be made common, the number of types of parts can be reduced, and the cost of parts can be reduced. Further, since it is not necessary to distinguish the first rail member from the second rail member, the assembly work of the rotation support mechanism is easy.

In the present invention, it is preferable that the movable body includes a holder that holds the camera module, the first member includes a first annular plate portion and a first extending portion, the first extending portion includes the first through hole and the first rail member that is fitted into the first through hole, and the first extending portion extends from the first annular plate portion to an outer peripheral side and is fixed to the holder. In this way, by assembling the camera module, the holder, and the first member, the first annular plate portion can be disposed at a position overlapping the camera module in the optical axis direction, and the first rail member can be disposed at a position surrounding the optical axis of the camera module.

In the present invention, it is preferable that the second member has a second annular plate portion including the second through hole and the second rail member fitted in the second through hole, and 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. In this way, when the second annular plate portion that rotates relative to the movable body is disposed in the gap between the first annular plate portion and the camera module in the optical axis direction to form the rotation support mechanism, the first annular plate portion and the camera module function as a stopper to restrict 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. This can reduce the height of the optical unit with the shake correction function in the optical axis direction.

In the present invention, it is preferable that the rotation support mechanism includes a pressurizing mechanism that applies a force to bring the first annular groove and the second annular groove into proximity in the optical axis direction, the pressurizing mechanism includes a first protruding plate portion protruding from the first annular plate portion to an outer circumferential side, and a pressurizing magnet fixed to a part 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 to the pressurizing magnet. In this way, by providing the pressurizing magnet to the second annular plate portion that rotates relative to the movable body and providing the first protruding plate portion that is attracted by the pressurizing magnet to the movable body, it is possible to avoid the rotational position of the first protruding plate portion from being attracted and displaced by the magnet of the magnetic drive mechanism that is attached to the movable body. Therefore, the pressurizing mechanism can be prevented from being disturbed by the magnetic driving mechanism. In addition, the angular position of the movable body about the optical axis can be defined by the pressing mechanism.

In the present invention, it is preferable that the second member includes a pair of second extending portions extending from the second annular plate portion to both sides in the first axial direction and connected to the gimbal mechanism, and a pair of second protruding plate portions protruding from the second annular plate portion to both sides in the second axial direction, the pressing magnet is fixed to each of the pair of second extending portions and the pair of second protruding plate portions, and the first protruding plate portion protrudes from the first annular plate portion to both sides in the first axial direction and both sides in the second axial direction. In this way, the pressing magnet and the first protruding plate portion can be arranged uniformly in the circumferential direction around the optical axis. Therefore, the magnetic attractive force for pressurization can be generated uniformly in the circumferential direction.

In the present invention, it is preferable that the holder is made of resin, and a stopper protrusion portion facing the pair of second extending portions and the pair of second protruding plate portions 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. In this way, the second annular plate portion can be restricted from separating from the first annular plate portion by the stopper protrusion. In addition, in the holder, a complicated uneven shape is more easily formed on one side of the resin than on the other side of the metal plate. Therefore, the retainer having the stopper protrusion is easily manufactured. Further, when the holder is made of resin, strength can be secured even if an end plate portion protruding inward is not provided at the end in the optical axis direction as in the case of a metal-plate holder. Therefore, the height of the movable body in the optical axis direction can be reduced.

In the present invention, it is preferable that the optical disc drive further includes a rotation restricting mechanism for restricting 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 that extends from the second annular plate portion to an outer peripheral side, the first rotation restricting portion and the second rotation restricting portion being different in position in a circumferential direction around the optical axis from the first extending portion, one of the first rotation restricting portion and the second rotation restricting portion surrounding both sides in the circumferential direction of the other of the first rotation restricting portion and the second rotation restricting portion. In this way, in the case where the rotation restricting mechanism is configured by causing the first member or the holder constituting the movable body to collide with the second annular plate portion, it is possible to suppress a decrease in dimensional accuracy of the rotation restricting mechanism due to accumulation of component tolerances, as compared with the case where the rotation restricting mechanism is configured by causing the housing surrounding the movable body to collide with the holder of the movable body. In particular, when the first member and the second annular plate portion collide with each other, the rotation restricting mechanism can be completed inside the rotation support mechanism. Therefore, the rotation range of the movable body can be restricted with high accuracy.

In the present invention, it is preferable that a first magnet of a first shake correction magnetic drive mechanism for rotating the movable body about the first axis, a second magnet of a second shake correction magnetic drive mechanism for rotating the movable body about the second axis, and a third magnet of a rolling correction magnetic drive mechanism for rotating the movable body about the optical axis are fixed to the holder, the first magnet, the second magnet, and the third magnet are arranged in a circumferential direction about the optical axis, the first extending portion is formed of a magnetic metal, and the first extending portion is bent toward the holder at an outer circumferential side of the first annular plate portion and fixed to each position 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. In this way, the yoke portion of the magnet of the shake correction magnetic drive mechanism and the yoke portion of the magnet of the roll correction magnetic drive mechanism are all integrated with the first member, and therefore the number of parts can be reduced. Further, the assembly work of the movable body is easy, and the positional accuracy of the yoke portion can be improved.

Effects of the invention

According to the present invention, the rotation support mechanism that supports the movable body so as to be rotatable about the optical axis includes the first rail member and the second rail member that overlap in the optical axis direction. By forming the part of the rail provided with the annular groove into a component in this manner, the component shape can be simplified, and the component cost can be reduced. Further, since the first rail member is fitted into the first through hole of the first member constituting the movable body and the second rail member is fitted into the second through hole of the second member supported by the gimbal mechanism, the number of components to be overlapped in the optical axis direction is small compared with a structure in which the rail members are overlapped and joined to the edges of the through holes. Therefore, the height of the rotation support mechanism in the optical axis direction can be reduced. This can reduce the product height of the optical unit with the shake correction function in the optical axis direction.

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 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 base removed.

Fig. 5 is a cross-sectional view of the optical unit with shake correction function cut at a position a-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 … optical unit with shake correction function; 2 … camera module; 2a … lens; 2b … image pickup element; 3 … a housing; 4 … cover; 4a … opening part; 5 … a base; 6 … flexible printed substrate; 7 … flexible printed substrate; 8 … hook; 9 … protrusions; 10 … movable body; 11 … fixed body; 12 … rotary support mechanism; 13 … gimbal mechanism; 14 … gimbal frame; 15 … a first connection mechanism; 16 … second connection mechanism; 17 … magnetic plate; 18 … frame portion; 19 … wiring accommodating part; 20 … magnetic drive mechanism for shake correction; 21 … a first shake correction magnetic drive mechanism; 21C … first coil; 21M … first magnet; 22 … second shake correction magnetic drive mechanism; 22C … second coil; a 22M … second magnet; 23 … magnetic drive mechanism for roll correction; 23C … third coil; 23M … third magnet; 24 … holding rack; 25 … a first component; 26 … a first annular plate portion; 26a … circular holes; 27 … a first extension; 28 … a first extension portion first portion; 29 … a first extension second portion; 30a … camera module main body portion; 30B … camera module cylindrical part; 31 … first side wall; 32 … second side wall; 32a … notch portion; 33 … third side wall; 34 … fourth side wall; 35 … fifth side wall; 36 … sixth side wall; 37 … seventh side wall; 38 … eighth sidewall; 39 … stop projection; 40 … recess; 41 … bottom surface; 42 … groove parts; 43 … convex portions; 43a … side; 50 … a first rail member; 51 … a first plate-like member; 52 … first through hole; 53 … first annular groove; 54 … a second annular groove; 55 … second part; 56 … rolling elements; a 57 … retainer; 58 … sphere holding holes; 59 … pressing mechanism; 60 … second rail member; 61 … second plate-like member; 62 … a second through hole; 63 … a second annular plate portion; 64 … second extension; 65 … second projection plate portion; 66 … second extension first portion; 67 … a second extension; 68 … a pressurizing magnet; 69 … a first projection plate portion; 70 … rotation limiting mechanism; 71 … a first rotation restriction portion; 72 … a second rotation restriction portion; 73 … notch portion; 140 … gimbal frame body portion; 141 … a first axial side extension; 142 … second axial side extension; 143 … opening parts; 144 … a first axially concave curved surface; 145 … notches; a 146 … projection; 147 … second axial concave curve; 148 … notch; 151 … first gimbal frame receiving member; 152 … sphere; 153 … first thrust receiving member; 154 … board portion; 155, 155 … a leg; 156 … arm portions; 157 … aperture portion; a 161 … recess; 162 … a second gimbal frame receiving part; 163 … sphere; 164 … second thrust receiving member; 165 … board parts; 166 … leg portions; 167 … an arm; 168 … leg bends; 181a … second coil fixing hole; 181 … a first side plate part; 182 … second side panel portion; 183a … first coil fixing hole; 183 … third side panel portion; 184a … third coil mounting hole; 184 fourth side panel portion 184 …; 185 … notch portion; 191 … fifth side plate part; 192 … sixth side panel portion; 193 … seventh side plate part; 194 … notched portions; an L … optical axis; r1 … first axis; r2 … second axis.

Detailed Description

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

(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 base 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 photographing, a disorder is generated in a photographed 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 2 a. The optical unit 1 with the 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 side opposite to 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 rotatably about the first axis R1, and supports the rotation support mechanism 12 rotatably 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 direction of the first axis R1. 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 a 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 shake correction function 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 section 183 is located in the-Y direction of the fourth side plate section 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 183 a. The first side plate portion 181 of the housing 3 is provided with a second coil fixing hole 181 a. The second coil 22C is fixed in the second coil fixing hole 181 a. 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 184 a. 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 the first magnetic drive mechanism 21 for shake 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 circuit 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 overlapping the first coil 21C constitute a magnetic spring for returning the movable body 10 to the reference angular position in the rotational direction about 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 position 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 sectional views of the optical unit with a shake correction function. Fig. 5 is a sectional view taken at a position a-a of fig. 2, and fig. 6 is a sectional view taken at 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 a second axis R2 are provided at diagonal positions in the second axis R2 direction of the frame portion 18. The 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 spherical body 163 and a second thrust receiving member 164 that fixes the spherical body 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 member 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 direction of the first axis R1. The first connecting mechanism 15 includes first gimbal frame receiving members 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 rotary support mechanism 12, the position of the spherical body 152 on the first axis R1 is supported by the rotary 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 member 151 and 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 on the first shaft R1 with a first shaft-side concave curved surface 144 that is concave toward the inner peripheral side toward the movable body 10 side in the first shaft R1 direction. The first axial side extension 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 the 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 distal 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 peripheral side and inserted into the inner peripheral 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 peripheral side and inserted into the inner peripheral 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 bodies 163 of the second gimbal frame receiving member 162 can be maintained in contact with each other. The notch 145 of the second shaft-side extension 142 is disposed between the pair of arm portions 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 of the subject. As shown in fig. 8 and 9, the movable body 10 includes the camera module 2, a frame-shaped holder 24 for holding 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 extending 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 to which the first rail member 50 is joined. 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 positions equally angularly spaced around 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 in the first axis R1 direction, and seventh and

eighth side walls

37, 38 located diagonally in 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 have groove portions 42 formed 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 extending portion second portion 29 is inserted into the groove portion 42 at both circumferential ends and fixed to the respective recessed portions 40 with 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 an annular 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 projecting from the second annular plate portion 63 to both sides in the direction of the first axis R1, and a pair of second projecting plate portions 65 projecting from the second annular plate portion 63 to both sides in the direction of the second axis R2. 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 the gap in the optical axis L direction between the first annular plate portion 26 of the first member 25 and the camera module main body portion 30A.

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 positions 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 in four directions, i.e., from the first annular plate portion 26 in the first axis R1 direction and 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 close to each other in the Z-axis direction at four positions 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 projection 39 provided on the holder 24 in the direction of the optical axis L. 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 of the first side wall 31, the third side wall 33, and the fourth side wall 34 in the-Z direction. 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 portion 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 angular positions intermediate between the first axis R1 direction and the second axis R2 direction, among the eight side walls 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, 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 the second axis R2 can be reduced by making the portions cut in the Z-axis direction.

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 provided with a camera module 2; a rotation support mechanism 12 that supports the movable body 10 so as to be rotatable about the optical axis L of the camera module 2; 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 that supports the movable body 10 via a gimbal mechanism 13 and a rotation support mechanism 12. The rotation support mechanism 12 includes: a first rail member 50 formed with a first annular groove 53 surrounding the optical axis L and overlapping the camera module 2 when viewed from the optical axis L direction; a second rail member 60 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 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 first rail member 50 and the second rail member 60. The movable body 10 includes a first member 25, and the first member 25 includes a first rail member 50 and a first through hole 52 into which the first rail member is fitted. The second rail member 60 is fitted into the second through hole 62, and the second through hole 62 is provided in the second member 55 supported by the gimbal mechanism 13 so as to be rotatable about the first axis R1.

According to the present embodiment, the rotation supporting mechanism 12 that supports the movable body 10 so as to be rotatable about the optical axis L includes the first rail member 50 and the second rail member 60 that overlap in the direction of the optical axis L. By forming the part of the rail provided with the annular groove into a component in this manner, the component shape can be simplified, and the component cost can be reduced. In addition, the thickness of the portion other than the rail can be reduced to be thinner than the rail, so that the weight can be reduced. Further, since the first rail member 50 is fitted into the first through hole 52 of the first member 25 constituting the movable body 10 and the second rail member 60 is fitted into the second through hole 62 of the second member 55 supported by the gimbal mechanism 13, the number of components to be overlapped in the optical axis L direction is small compared to a structure in which rail members are overlapped and joined to the edges of the through holes. Therefore, the height of the rotation support mechanism 12 in the direction of the optical axis L can be reduced. This can reduce the product height of the optical unit 1 with the shake correction function in the optical axis L direction.

In the present embodiment, the first rail member 50 and the second rail member 60 are the same member. Thus, since the parts can be made common, the number of types of parts can be reduced, and the cost of the parts can be reduced. Further, since it is not necessary to distinguish the first rail member 50 from the second rail member 60, the assembly work of the rotation support mechanism 12 is easy.

In this embodiment, the movable body 10 includes a holder 24 for holding the camera module 2. The first member 25 includes a first annular plate portion 26 having a first rail member 50 fitted into the first through hole 52 and the first through hole 52, and a first extension portion 27 extending from the first annular plate portion 26 toward the outer peripheral side and fixed to the holder 24. By assembling the camera module 2, the holder 24, and the first member 25 in this manner, the first annular plate portion 26 can be disposed at a position overlapping the camera module 2 in the direction of the optical axis L, and the first rail member 50 can be disposed at a position surrounding the optical axis L of the camera module 2.

In the present embodiment, the second member 55 has a second annular plate portion 63 having a second through hole 62 and a second rail member 60 fitted into the second through hole 62, and 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. In this way, when the rotation support mechanism 12 is configured by disposing the second annular plate portion 63 that rotates relative to the movable body 10 in the gap between the first annular plate portion 26 and the camera module 2 in the direction of the optical axis L, the first annular plate portion 26 and the camera module 2 function as a stopper to restrict the second annular plate portion 63 from coming off. Therefore, there is no need to additionally overlap and arrange a stopper member that overlaps the second annular plate portion 63 in the direction of the optical axis L, so the height of the rotation support mechanism 12 in the direction of the optical axis L can be reduced. Therefore, the height of the optical unit 1 with a shake correction function in the direction of the optical axis L can be reduced.

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. In this way, by attaching the pressing magnet 68 to the second annular plate portion 63 that rotates relative to the movable body 10 and providing the first protruding plate portion 69 attracted by the pressing magnet 68 to the movable body 10, it is possible to avoid the rotational position of the first protruding plate portion 69 from being displaced by the attraction of the magnet of the magnetic drive mechanism attached to the movable body 10. Therefore, the pressurizing mechanism 59 can be prevented from being disturbed by the magnetic driving mechanism. In addition, the angular position of the movable body 10 about the optical axis L can be defined by the pressurizing mechanism 59.

In the present embodiment, the second member 55 includes a pair of second extending portions 64 extending from the second annular plate portion 63 to both sides in the direction of the first axis R1 and connected to the gimbal mechanism 13, and a pair of second protruding plate portions 65 protruding from the second annular plate portion 63 to both sides in the direction of the second axis R2. The pressing magnet 68 is fixed to each of the pair of second extending portions 64 and the pair of second protruding plate portions 65, and the first protruding plate portions 69 protrude from the first annular plate portion 26 on both sides in the first axis R1 direction and on both sides in the second axis R2 direction. Thus, the pressing magnet 68 and the first protruding plate portion 69 can be arranged uniformly in the circumferential direction around the optical axis L. Therefore, the magnetic attractive force for pressurization can be generated uniformly in the circumferential direction.

In the present embodiment, the holder 24 is made of resin, and the stopper protrusion 39 facing the pair of second extending portions 64 and the pair of second protruding plate portions 65 in the optical axis L direction is provided at a diagonal position in the first axis R1 direction and a diagonal position in the second axis R2 direction of the holder 24. In this way, the second annular plate portion 63 can be restricted from separating from the first annular plate portion 26 by the stopper convex portion 39. In addition, in the holder 24, a complicated uneven shape is more easily formed on one side of the resin than on the other side of the metal plate. Therefore, the retainer 24 including the stopper protrusion 39 can be easily manufactured. Further, when the holder 24 is made of resin, strength can be secured even if an end plate portion protruding inward is not provided at the end in the optical axis L direction as in the case of the holder 24 made of a metal plate. Therefore, the height of the movable body 10 in the optical axis L direction can be reduced.

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 or the holder 24 and a second rotation restricting portion 72 extending from the second annular plate portion 63 to the outer circumferential side. The first rotation restriction portion 71 and the second rotation restriction portion 72 are different in position in the circumferential direction around the optical axis L from the first extension portion 27, and one of the first rotation restriction portion 71 and the second rotation restriction portion 72 surrounds both sides in the circumferential direction of the other of the first rotation restriction portion 71 and the second rotation restriction portion 72. In this way, in the case where the first member 25 and the second annular plate portion 63 constituting the movable body 10 are caused to collide to constitute the rotation restricting mechanism 70, it is possible to suppress a decrease in the dimensional accuracy of the rotation restricting mechanism 70 due to the accumulation of component tolerances, as compared with the case where the housing 3 surrounding the movable body 10 and the holder 24 of the movable body 10 are caused to collide to constitute the rotation restricting mechanism 70. In particular, when the first member 25 and the second annular plate portion 63 collide with each other, the rotation restricting mechanism 70 is completed inside the rotation support mechanism 12. Therefore, the rotation range of the movable body 10 can be restricted with high accuracy.

In this embodiment, the first magnet 21M of the first shake correction magnetic drive mechanism 21 for rotating the movable body 10 about the first axis R1, the second magnet 22M of the second shake correction magnetic drive mechanism 22 for rotating the movable body 10 about the second axis R2, and the third magnet 23M of the roll correction magnetic drive mechanism 23 for rotating the movable body 10 about the optical axis L are fixed to the holder 24. 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 first extension 27 is made of a magnetic metal, and is bent toward the holder 24 at the outer peripheral side of the first annular plate 26 and fixed to each of the inner peripheral side of the first magnet 21M, the inner peripheral side of the second magnet 22M, and the inner peripheral side of the third magnet 23M. In this way, the yoke parts of the magnets of the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23 are all integrated with the first member 25, so that the number of parts can be reduced. Further, since the yoke portion is attached by assembling the first member 25 and the holder 24, the assembling work of the movable body 10 is easy. In addition, the positional accuracy of the yoke can be improved.

(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 at the center of the second rotation restriction portion 72 in the circumferential direction, and the first rotation restriction 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 toward the outer peripheral 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)

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 first annular plate portion 26 and the second annular plate portion 63 are disposed in the optical axis L direction in an opposite manner.

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 rotation support mechanism includes:

a first rail member formed with a first annular groove around the optical axis and overlapping the camera module when viewed from the optical axis direction;

a second rail member in which a second annular groove is formed so as to face the first annular groove in the optical axis direction; and

a plurality of rolling elements inserted into the first and second annular grooves and rolling between the first and second rail members,

The movable body includes a first member having the first rail member and a first through hole into which the first rail member is fitted,

the second rail member is fitted into a second through hole provided in a second member supported by the gimbal mechanism so as to be rotatable about the first axis.

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

the first and second track members are the same member.

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

the movable body is provided with a holder for holding the camera module,

the first member includes a first annular plate portion including the first through hole and the first rail member fitted into the first through hole, and a first extending portion extending from the first annular plate portion to an outer circumferential side and fixed to the holder.

4. The optical unit with shake correcting function according to claim 3,

the second member has a second annular plate portion including the second through hole and the second rail member fitted into the second through hole,

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.

5. The optical unit with a shake correcting function according to claim 4,

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 to an outer circumferential 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 attracted by the pressurizing magnet.

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

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

the pressing magnets are fixed to the pair of second extending portions and the pair of second protruding plate portions,

The first protruding plate portion protrudes from the first annular plate portion on both sides in the first axial direction and on both sides in the second axial direction.

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

the retainer is made of resin, and is provided with a plurality of holding grooves,

the retainer is provided with a pair of second extending portions and a pair of second protruding plate portions, which are disposed at positions diagonal to the first axial direction and diagonal to the second axial direction of the retainer.

8. The optical unit with shake correcting function according to any one of claims 4 to 7,

a rotation limiting mechanism for limiting 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 extending from the second annular plate portion toward an outer peripheral side,

the first rotation restricting portion and the second rotation restricting portion are different in position around the circumferential direction of the optical axis from the first extending portion,

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.

9. The optical unit with shake correcting function according to any one of claims 3 to 8,

a first magnet of a first shake correction magnetic drive mechanism for rotating the movable body about the first axis, a second magnet of a second shake correction magnetic drive mechanism for rotating the movable body about the second axis, and a third magnet of a roll correction magnetic drive mechanism for rotating the movable body about the optical axis are 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 extension portion is made of a magnetic metal, and is bent toward the holder at the outer peripheral side of the first annular plate portion and fixed to each of the inner peripheral side of the first magnet, the inner peripheral side of the second magnet, and the inner peripheral side of the third magnet.