CN115145087B

CN115145087B - Optical unit with jitter correction function

Info

Publication number: CN115145087B
Application number: CN202210330599.XA
Authority: CN
Inventors: 新井努; 南泽伸司; 须江猛
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2021-03-30
Filing date: 2022-03-30
Publication date: 2023-05-09
Anticipated expiration: 2042-03-30
Also published as: CN115145087A; JP2022153710A

Abstract

An optical unit with a shake correction function has a reflection member formed with a reflection surface for reflecting light incident from the outside, and can simplify the structure and expand the rotation range of the reflection member. In the optical unit with the shake correction function, the plate spring rotatably holding the reflecting portion having the reflecting member on the fixed body is rotatable with respect to the fixed body in an axial direction in which the plate spring is rotatable with respect to the fixed body in a first direction parallel to an incident direction of light to the reflecting surface of the reflecting member, and the reflecting portion is rotatable with respect to the plate spring in an axial direction in which the plate spring is rotatable in a second direction orthogonal to the first direction. The leaf spring is formed with a supported portion that biases the first rotation shaft portion constituting the rotation center of the leaf spring with respect to the fixed body in a first direction, and a supporting portion that biases the second rotation shaft portion constituting the rotation center of the reflecting portion with respect to the leaf spring in a second direction.

Description

Optical unit with jitter correction function

Technical Field

The present invention relates to an optical unit with a shake correction function having a shake correction function for correcting an optical image shake.

Background

Conventionally, a camera module having a shake correction function for correcting shake of an optical image is known (for example, refer to patent document 1). The camera module described in patent document 1 includes a reflection module, a lens module, and an image sensor module, which are disposed in a housing. The reflection module includes a reflection member that reflects light and a rotary holder that fixes the reflection member. The reflection module further includes a first ball, a rotation plate, and a second ball. The first ball is disposed between the wall surface of the housing and the rotating plate. The first balls are arranged at two positions with a space therebetween in the X-axis direction. The second balls are disposed between the rotating plate and the rotating cage. The second balls are arranged at two positions with a space therebetween in the Y-axis direction.

In the camera module described in patent document 1, the first ball contacts the wall surface of the housing and the rotating plate at a predetermined contact pressure by a magnetic attraction force acting between the permanent magnet attached to the rotating holder and the yoke attached to the wall surface of the housing, and the second ball contacts the rotating plate and the rotating holder at a predetermined contact pressure. In this camera module, the reflective member is rotatable with respect to the wall surface of the housing together with the rotation plate and the rotation holder in the X-axis direction as the axial direction of rotation with the two first balls as fulcrums. The reflecting member is rotatable together with the rotating holder with respect to the rotating plate by taking the Y-axis direction as the axial direction of rotation with the two second balls as the support points. In this camera module, the reflection member is rotated with the X-axis direction and the Y-axis direction as the axial directions of rotation, and shake correction of an optical image is performed.

Prior art literature

Patent literature

Patent document 1: U.S. patent application publication 2018/0224665 specification

Disclosure of Invention

Technical problem to be solved by the invention

In the camera module described in patent document 1, since the first ball disposed between the wall surface of the housing and the rotation plate serves as a fulcrum for rotation of the reflecting member in the axial direction rotating in the X-axis direction, the wall surface of the housing and the rotation plate serve as obstacles, and there is a possibility that the rotation range of the reflecting member in the axial direction rotating in the X-axis direction becomes narrow. In this camera module, since the second ball disposed between the rotation plate and the rotation holder serves as a fulcrum for rotation of the reflecting member in the axial direction rotating about the Y-axis direction, the rotation plate and the rotation holder serve as obstacles, and there is a possibility that the rotation range of the reflecting member in the axial direction rotating about the Y-axis direction becomes narrow.

That is, in the camera module described in patent document 1, the rotation range of the reflecting member may be narrowed. In the camera module described in patent document 1, a permanent magnet attached to the rotary holder and a yoke attached to the wall surface of the housing are required to bring the wall surface of the housing and the rotary plate into contact with the first ball at a predetermined contact pressure and bring the rotary plate and the rotary holder into contact with each other at a predetermined contact pressure. Therefore, in the camera module, the structure of the reflection module may become complicated.

Accordingly, an object of the present invention is to provide an optical unit with a shake correction function, which has a reflection member formed with a reflection surface for reflecting light incident from the outside, and which can simplify the structure and expand the rotation range of the reflection member.

Technical proposal adopted for solving the technical problems

In order to solve the above-described problems, the present invention provides an optical unit with a shake correction function, comprising: a reflection unit having a reflection member formed with a reflection surface for reflecting light incident from the outside; a leaf spring rotatably holding the reflecting portion; a fixing body that rotatably holds the leaf spring; a drive mechanism that rotates the reflecting portion with respect to the leaf spring and rotates the leaf spring with respect to the fixed body; a first rotation shaft portion that constitutes a rotation center of the plate spring with respect to the fixed body; and a second rotation shaft portion that constitutes a rotation center of the reflection portion with respect to the plate spring, the plate spring being rotatable with respect to the fixed body in an axial direction that rotates in a first direction parallel to an incidence direction of light to the reflection surface, the reflection portion being rotatable with respect to the plate spring in an axial direction that rotates in a second direction orthogonal to the first direction, a supported portion that is rotatably supported by the fixed body and biases the first rotation shaft portion in the first direction, and a support portion that rotatably supports the reflection portion and biases the second rotation shaft portion in the second direction being formed on the plate spring.

In the optical unit with a shake correction function according to the present invention, the plate spring rotatably holding the reflecting portion having the reflecting member on the fixed body is rotatable with respect to the fixed body in an axial direction in which the plate spring is rotatable with respect to the fixed body in a first direction parallel to an incidence direction of light to the reflecting surface formed on the reflecting member, and the reflecting portion is rotatable with respect to the plate spring in an axial direction in which the plate spring is rotatable in a second direction orthogonal to the first direction. In the present invention, the leaf spring is formed with a supported portion that biases the first rotation shaft portion constituting the rotation center of the leaf spring with respect to the fixed body in the first direction, and a supporting portion that biases the second rotation shaft portion constituting the rotation center of the reflecting portion with respect to the leaf spring in the second direction.

Therefore, in the present invention, the reflection member can be rotated with respect to the fixed body by using a relatively simple structure of one leaf spring, with the first direction and the second direction as the axial directions of rotation. In the present invention, since the first rotation shaft portion is biased in the first direction by the supported portion of the leaf spring and the second rotation shaft portion is biased in the second direction by the support portion of the leaf spring, it is possible to remove a member that prevents rotation of the reflecting member or the like, such as the rotation plate, the rotation holder, or the like of the camera module described in patent document 1. Therefore, in the present invention, the range of rotation of the leaf spring in the axial direction with respect to the fixed body in the first direction can be enlarged, and the range of rotation of the reflecting portion in the axial direction with respect to the leaf spring in the second direction can be enlarged. As a result, in the present invention, the structure of the optical unit with the shake correction function can be simplified and the rotation range of the reflecting member can be enlarged.

In the present invention, for example, the first rotating shaft portion includes two first balls arranged in a first direction with a space therebetween, the second rotating shaft portion includes two second balls arranged in a second direction with a space therebetween, the supported portion biases the first balls toward the fixed body, and the supporting portion biases the second balls toward the reflecting portion.

In the present invention, it is preferable that the reflecting portion includes a holding member for fixing the reflecting member, and the second rotating shaft portion is disposed inside the holding member. With this configuration, the driving mechanism can be easily disposed on the outer peripheral side of the holding member.

In the present invention, the leaf spring preferably includes: two first opposing portions disposed to face each other with a space therebetween in the first direction; two second opposing portions disposed to face each other with a space therebetween in the second direction; and a first connecting portion connecting the two first opposing portions, wherein a first opposing portion of one of the two first opposing portions constitutes a part of a second connecting portion connecting the two second opposing portions, the supported portion is constituted by the two first opposing portions and the first connecting portion, and the supporting portion is constituted by the two second opposing portions and the second connecting portion. With this configuration, since one of the two first opposing portions forms a part of the second connecting portion, the structure of the leaf spring can be simplified and the leaf spring can be miniaturized even if the supported portion and the supporting portion are formed in the leaf spring.

In the present invention, it is preferable that the first opposing portion has a first contact portion that contacts the first rotating shaft portion, and the second opposing portion has a second contact portion that contacts the second rotating shaft portion, and the first contact portion and the second contact portion are disposed at substantially the same position in a third direction orthogonal to the first direction and the second direction. That is, in the present invention, the first rotation shaft portion and the second rotation shaft portion are preferably arranged at substantially the same position in the third direction. With this configuration, the center of gravity of the reflecting portion can be approximated to both the axis line which is the rotation center of the plate spring with respect to the fixed body and the axis line which is the rotation center of the reflecting portion with respect to the plate spring. Therefore, even when the reflecting portion is rotated in the first direction as the axial direction of rotation, or when the reflecting portion is rotated in the second direction as the axial direction of rotation, it is easy to smoothly rotate the reflecting portion.

In the present invention, the second connecting portion preferably includes two curved portions having a U shape when viewed from a third direction orthogonal to the first direction and the second direction, and the first opposing portion constituting a part of the second connecting portion is preferably disposed between the two curved portions in the second direction. With this configuration, the spring constant of the support portion can be reduced. Therefore, the variation in the biasing force of the support portion can be suppressed.

In the present invention, preferably, when the direction orthogonal to the first direction and the second direction is the third direction, the supported portion is disposed on one side of the first direction of the reflecting portion, and the first connecting portion is disposed on one side of the third direction of the two first opposing portions and is inclined so as to be directed to one side of the first direction as being directed to one side of the third direction. With this configuration, even if the rotation range of the reflecting portion in the axial direction in which the reflecting portion rotates in the second direction is widened, interference between the reflecting portion and the first connecting portion can be prevented when the reflecting portion rotates in the axial direction in which the plate spring rotates in the second direction.

In the present invention, it is preferable that, when the direction orthogonal to the first direction and the second direction is the third direction, the stopper member for preventing the reflection portion from falling off to one side of the third direction with respect to the fixed body is provided, the first rotation shaft portion is arranged between the other side portions of the two first opposing portions in the first direction, the first connecting portion is arranged on one side of the two first opposing portions in the third direction, and the stopper member is fixed to the fixed body on the other side of the two first opposing portions in the third direction.

With this configuration, the first connecting portion is disposed on one side of the first opposing portion in the third direction, and the stopper member is fixed to the fixed body on the other side of the first opposing portion in the third direction. In the above-described configuration, if the second rotating shaft portion is disposed at a position close to the first rotating shaft portion in the third direction, the stopper member can be disposed at a position closer to the second rotating shaft portion than in the case where the stopper member is fixed to the fixed body on the side of the first opposing portion in the third direction.

Therefore, even if the gap between the reflecting portion and the stopper member is narrowed, interference between the reflecting portion and the stopper member when the reflecting portion rotates in the first direction or the second direction as the axial direction of rotation can be prevented. As a result, interference between the reflecting portion and the stopper member when the reflecting portion rotates in the axial direction of rotation in the first direction or the second direction can be prevented, and the optical unit with the shake correction function can be miniaturized.

Effects of the invention

As described above, in the optical unit with a shake correction function including the reflection member having the reflection surface formed to reflect light incident from the outside, the structure of the optical unit with a shake correction function can be simplified and the rotation range of the reflection member can be enlarged.

Drawings

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

Fig. 2 is a perspective view of a smart phone incorporating the optical unit with a shake correction function shown in fig. 1.

Fig. 3 is a schematic diagram for explaining the structure of a camera incorporated in the smart phone shown in fig. 2.

Fig. 4 is an exploded perspective view of the optical unit with a shake correction function shown in fig. 1.

Fig. 5 is a plan view of the optical unit with the shake correction function shown in fig. 1.

Fig. 6 is a cross-sectional view of the E-E section of fig. 5.

Fig. 7 is a cross-sectional view of the F-F section of fig. 5.

Fig. 8 is a perspective view showing the holding member shown in fig. 1 from the other side.

Description of the reference numerals

1 … optical unit (optical unit with shake correction function); 9 … reflector; 10 … prism (reflective member); 10a … reflecting surfaces; 11 … holder (holding member); 12 … leaf spring; 12a … supported portions; 12b … support; 12c, 12d … first opposed portions; 12e … second opposed portions; 12f … first connecting portion; 12g … second connecting portion; 12h … first contact; 12k … curve; 12p … second contact; 13 … fixture; 14 … drive mechanism; 15 … rotating shaft portion (first rotating shaft portion); 16 … rotating shaft portion (second rotating shaft portion); 17 … stop member; 32 … balls (first balls); 34 … balls (second balls); v … second direction; w … third direction; z … first direction;

Detailed Description

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

(integral Structure of optical Unit with shake correction function)

Fig. 1 is a perspective view of an optical unit 1 with a shake correction function according to an embodiment of the present invention. Fig. 2 is a perspective view of a smartphone 2 incorporating the optical unit 1 with shake correction function shown in fig. 1. Fig. 3 is a schematic diagram for explaining the structure of the camera 3 incorporated in the smartphone 2 shown in fig. 2. Fig. 4 is an exploded perspective view of the optical unit 1 with shake correction function shown in fig. 1. Fig. 5 is a plan view of the optical unit 1 with the shake correction function shown in fig. 1. Fig. 6 is a cross-sectional view of the E-E section of fig. 5. Fig. 7 is a cross-sectional view of the F-F section of fig. 5. Fig. 8 is a perspective view showing the retainer 11 shown in fig. 1 from the other side.

The optical unit 1 with a shake correction function (hereinafter referred to as "optical unit 1") of the present embodiment has a shake correction function for correcting a shake of an optical image. The optical unit 1 is built in, for example, a smartphone 2 (see fig. 2). The optical unit 1 forms a part of a camera 3 (see fig. 3) incorporated in the smartphone 2. The optical unit 1 may be incorporated in a portable device other than the smartphone 2.

As shown in fig. 3, the camera 3 includes a lens 4 into which light from the outside of the smartphone 2 is incident, and a substrate 6 on which the imaging element 5 is mounted. The optical axis L1 of the lens 4 is orthogonal to a normal L2 passing through the center of the imaging surface of the imaging element 5. That is, the optical axis L of the lens 4 is parallel to the imaging surface of the imaging element 5. The optical unit 1 is disposed between the lens 4 and the imaging element 5 in an optical path from the lens 4 to the imaging element 5. A lens 7 is disposed between the optical unit 1 and the imaging element 5. The optical axis of the lens 7 coincides with the normal L2.

The optical unit 1 includes a prism 10 as a reflecting member formed with a reflecting surface 10a that reflects light incident from the outside. The light passing through the lens 4 enters the reflecting surface 10a. The reflecting surface 10a reflects light incident on the reflecting surface 10a via the lens 4 toward the imaging element 5. The reflection surface 10a bends the optical axis of the light incident on the reflection surface 10a by approximately 90 °. The light reflected by the reflecting surface 10a passes through the lens 7, and the light passing through the lens 7 enters the imaging element 5.

In the following description, a direction parallel to the incident direction of the light to the reflecting surface 10a (i.e., a direction of the optical axis L1 of the lens 4, a Z direction of fig. 1, etc.) is referred to as an up-down direction, a direction of a normal L2 of the imaging surface of the imaging element 5 (an X direction of fig. 1, etc.) is referred to as a front-back direction, and a Y direction of fig. 1, etc. orthogonal to the up-down direction and the front-back direction is referred to as a left-right direction. In addition, the side of the up-down direction on which the lens 4 is disposed with respect to the optical unit 1 (Z1 direction side in fig. 1 and the like) is referred to as the "upper" side, and the opposite side thereof, i.e., the Z2 direction side in fig. 1 and the like, is referred to as the "lower" side. In the front-rear direction, the side (X1 direction side in fig. 1 and the like) on which the imaging element 5 is disposed with respect to the optical unit 1 is referred to as the "front" side, and the opposite side, i.e., the X2 direction side in fig. 1 and the like, is referred to as the "rear" side.

The optical unit 1 includes a holder 11 as a holding member for fixing the prism 10, in addition to the prism 10. In the present embodiment, the reflecting portion 9 is constituted by the prism 10 and the holder 11. That is, the optical unit 1 includes the reflecting portion 9 having the prism 10 and the holder 11. The optical unit 1 further includes a leaf spring 12 rotatably holding the reflecting portion 9, and a fixing body 13 rotatably holding the leaf spring 12.

The optical unit 1 further includes: a driving mechanism 14 that rotates the reflecting portion 9 with respect to the plate spring 12 and rotates the plate spring 12 with respect to the fixed body 13; a rotation shaft portion 15 as a first rotation shaft portion that constitutes a rotation center of the plate spring 12 with respect to the fixed body 13; a rotation shaft portion 16 as a second rotation shaft portion that constitutes a rotation center of the reflecting portion 9 with respect to the plate spring 12; and a stopper 17 for preventing the reflection unit 9 from falling off from the fixed body 13.

The leaf spring 12 is rotatable relative to the fixed body 13 in an axial direction in which the leaf spring rotates in the up-down direction. The up-down direction (Z direction) of the present embodiment is the first direction. The reflection portion 9 is rotatable relative to the leaf spring 12 in an axial direction in which the second direction (V direction in fig. 8) orthogonal to the up-down direction is a rotation. The second direction changes depending on the rotational position of the leaf spring 12 with respect to the fixed body 13, but coincides with the direction inclined from the left-right direction or the left-right direction. If the W direction in fig. 8 orthogonal to the up-down direction and the second direction is the third direction, the third direction varies depending on the rotational position of the leaf spring 12 with respect to the fixed body 13, but coincides with the direction inclined from the front-rear direction or the front-rear direction. The optical unit 1 corrects the shake of the optical image by performing at least one of the rotation operation of the plate spring 12 with respect to the fixed body 13 and the rotation operation of the reflecting portion 9 with respect to the plate spring 12.

The holder 11 is formed of a resin material. An inclined surface 11a (see fig. 7) for fixing the prism 10 is formed on the upper surface side of the holder 11. The inclined surface 11a is inclined so as to be directed downward as being directed toward the front side. A recess 11b in which a driving magnet 23, which will be described later, constituting the driving mechanism 14 is disposed is formed on the rear surface side of the holder 11. The concave portion 11b is recessed toward the front side. A recess 11c in which the rotation shaft portion 16 is disposed is formed on the lower surface side of the holder 11. The concave portion 11c is recessed toward the upper side. The concave portions 11c are formed at two locations on both end sides of the holder 11 in the second direction.

Further, a recess 11d in which an upper end portion of the stopper 17 is disposed is formed on the lower surface side of the holder 11. The concave portion 11d is recessed toward the upper side. The upper end of the recess 11d is disposed below the upper end of the recess 11b. The recess 11d is formed at a position on the rear side of the center of the holder 11 in the third direction. As shown in fig. 8, the recess 11d is connected to the recess 11b via the notch 11 e.

The retainer 11 is formed with

stopper portions

11f and 11g for preventing the reflection portion 9 from falling off upward relative to the fixed body 13. The stopper 11f protrudes outward in the second direction from one end of the holder 11 in the second direction, and the stopper 11g protrudes outward in the second direction from the other end of the holder 11 in the second direction. Further, a stopper 11f is formed at a substantially central position of the holder 11 in the up-down direction, and a stopper 11g is formed at a lower end side of the holder 11.

The leaf spring 12 is formed of a metal material such as a steel plate. The plate spring 12 is formed by bending a flat plate-like metal plate having a substantially T shape into a predetermined shape or the like. The leaf spring 12 is formed with a supported portion 12a rotatably supported by the fixed body 13 and a support portion 12b rotatably supporting the reflecting portion 9. The specific structure of the leaf spring 12 will be described later.

The fixing body 13 is formed of a resin material. The fixing body 13 includes: two side surface portions 13a constituting side surfaces of the fixed body 13 in the left-right direction; a back surface portion 13b constituting a back surface of the fixed body 13; a bottom surface portion 13c constituting a bottom surface of the fixed body 13; and a spring holding portion 13d to which the supported portion 12a of the leaf spring 12 is attached. The bottom surface 13c is formed with a notch 13e cut from the front end of the bottom surface 13c to the rear side.

The spring holding portion 13d covers the notch portion 13e from above. Specifically, the spring holding portion 13d covers a portion other than the front end portion of the notch portion 13e from above. Both ends of the spring holding portion 13d in the lateral direction are connected to the upper surface of the bottom portion 13c. The front end surface of the spring holding portion 13d is a tapered surface 13f inclined downward with the direction of the front side. A through hole 13g (see fig. 7) in which a part of the stopper 17 is disposed is formed on the rear side of the spring holding portion 13d of the bottom surface portion 13c. The through hole 13g penetrates the bottom surface portion 13c in the up-down direction. The through hole 13g is a rectangular square hole, and is formed so that the longitudinal direction and the lateral direction of the through hole 13g coincide.

The reflecting portion 9 is disposed between the two side portions 13a in the left-right direction. The leaf spring 12 is disposed on the front side of the back surface portion 13b and on the upper side of the bottom surface portion 13 c. One side surface portion 13a of the two side surface portions 13a is formed with a stopper portion 13h disposed on an upper side of the stopper portion 11f of the holder 11, and the other side surface portion 13a is formed with a stopper portion 13k disposed on an upper side of the stopper portion 11g of the holder 11. In the present embodiment, the

stopper portions

11f, 11g, 13h, and 13k prevent the reflection portion 9 from falling off upward from the fixed body 13.

The driving mechanism 14 includes: a driving coil 22 and a driving magnet 23 for rotating the reflecting portion 9 relative to the leaf spring 12; and a driving coil 24 and a driving magnet 25 for rotating the leaf spring 12 with respect to the fixed body 13. The driving magnet 23 is fixed to the rear surface side of the holder 11 in a state of being disposed in the recess 11b of the holder 11. The driving magnet 25 is fixed to one side surface of the holder 11 in the second direction. The driving magnet 25 is disposed below the stopper 11 f. A magnetic plate 26 made of a magnetic material is disposed between the driving magnet 23 and the holder 11, and a magnetic plate 27 made of a magnetic material is disposed between the driving magnet 25 and the holder 11.

The driving coil 22 is disposed at the rear side of the driving magnet 23 and faces the driving magnet 23 in the front-rear direction. The driving coil 24 is disposed outside the driving magnet 25 in the second direction, and faces the driving magnet 25 in the second direction. The driving coils 22, 24 are mounted on a Flexible Printed Circuit (FPC) 28. The FPC28 is fixed to the outer peripheral surface of the fixed body 13. That is, the driving coils 22 and 24 are fixed to the fixed body 13 via the FPC 28. A through hole in which the driving coil 24 is disposed is formed in one side surface portion 13a of the fixed body 13 in the second direction, and a recess in which the driving coil 22 is disposed is formed in the rear surface of the rear surface portion 13 b.

The rotation shaft portion 15 is disposed below the reflecting portion 9. The rotation shaft portion 15 has: two ball fixing plates 31 fixed to the spring holding portion 13 d; and two balls 32 fixed to the ball fixing plate 31. The rotation shaft portion 15 of the present embodiment is composed of two ball fixing plates 31 and two balls 32. The ball fixing plate 31 and the balls 32 are formed of a metal material such as steel. The ball fixing plate 31 is formed in a flat plate shape. The ball fixing plate 31 is fixed to the upper and lower surfaces of the spring holding portion 13d, and is arranged such that the thickness direction of the ball fixing plate 31 coincides with the up-down direction.

The balls 32 are fixed to the ball fixing plate 31 by welding. The balls 32 are fixed to the upper surface side of the ball fixing plate 31 fixed to the upper surface of the spring holding portion 13d and the lower surface side of the ball fixing plate 31 fixed to the lower surface of the spring holding portion 13d, and the two balls 32 are arranged in a state of being spaced apart in the vertical direction. The lower end of the ball 32 disposed below the spring holding portion 13d is disposed above the lower surface of the bottom portion 13 c. The ball 32 of the present embodiment is a first ball.

The two balls 32 are arranged at the same position in the front-rear-left-right direction. The leaf spring 12 rotates with respect to the fixed body 13 about an axis passing through the centers of the two balls 32 as a rotation center. In the present embodiment, an axis passing through the centers of the two balls 32 coincides with the optical axis L1 of the lens 4. In the present embodiment, the axis passing through the centers of the two balls 32 passes through the vicinity of the center of gravity of the reflecting portion 9.

The rotation shaft portion 16 is disposed at substantially the same position in the up-down direction as the center position of the reflection portion 9 in the up-down direction. The rotation shaft portion 16 has: two ball fixing plates 33 fixed to the cage 11; and two spherical balls 34 fixed to the ball fixing plate 33. The rotation shaft portion 16 of the present embodiment is composed of two ball fixing plates 33 and two balls 34. The ball fixing plate 33 and the balls 34 are formed of a metal material such as steel. The ball fixing plate 33 is formed in a flat plate shape. The ball fixing plate 33 is disposed in the recess 11 c. The ball fixing plate 33 is fixed to the outer surface of the recess 11c in the second direction, and is disposed so that the thickness direction of the ball fixing plate 33 coincides with the second direction.

The balls 34 are fixed to the ball fixing plate 33 by welding. The balls 34 are fixed to the inner side surface of the ball fixing plate 33 in the second direction. The balls 34 are disposed in the recess 11 c. That is, the rotation shaft portion 16 is disposed in the recess 11c and is disposed inside the holder 11. In addition, the two balls 34 are arranged at intervals in the second direction. The balls 34 are disposed outside the balls 32 in the second direction. The ball 34 of the present embodiment is a second ball.

The two balls 34 are arranged at the same position in the up-down direction. In addition, the two balls 34 are arranged at the same position in the third direction. The reflecting portion 9 rotates with respect to the leaf spring 12 about an axis passing through the centers of the two balls 34 as a rotation center. In the present embodiment, an axis passing through the centers of the two balls 34 passes near the center of gravity of the reflecting portion 9. The rotation shaft portion 15 and the rotation shaft portion 16 are disposed at substantially the same position in the third direction. That is, the

balls

32 and 34 are arranged at substantially the same position in the third direction. In the present embodiment, the rotation shaft portion 15 and the rotation shaft portion 16 are arranged at the same position in the third direction. The rotation shaft portion 15 and the rotation shaft portion 16 are disposed at positions substantially coincident with the center of the reflection portion 9 in the third direction.

The stopper 17 prevents the reflection unit 9 from falling off to the third direction side with respect to the fixed body 13. Specifically, the stopper 17 plays a role of preventing the reflecting portion 9 from coming off to the front side with respect to the fixed body 13. The stopper member 17 is formed in a flat plate shape. The stopper member 17 is arranged such that the thickness direction of the stopper member 17 coincides with the front-rear direction. The upper end portion of the stopper member 17 is disposed in the recess 11d of the holder 11. A magnetic plate 26 is disposed at the rear side of the upper portion of the stopper member 17. The lower portion of the stopper 17 is disposed in the through hole 13 g.

The stopper 17 is pressed into and fixed to the through hole 13 g. That is, the stopper member 17 is fixed to the fixed body 13 at the rear side of the spring holding portion 13 d. The stopper member 17 is fixed to the fixed body 13 at the rear side of the rotation shaft portion 15. As shown in fig. 7, a convex portion 13p that contacts the rear surface of the stopper member 17 at a predetermined contact pressure is formed on the rear side surface of the through hole 13 g. The convex portion 13p protrudes toward the front side. The front surface of the stopper 17 contacts the front side surface of the through hole 13g at a predetermined contact pressure.

(Structure of leaf spring)

As described above, the supported portion 12a and the supporting portion 12b are formed on the leaf spring 12. The leaf spring 12 has two first opposing

portions

12c, 12d disposed to face each other with a space therebetween in the up-down direction. In the present embodiment, the first opposing portion 12c is disposed on the upper side, and the first opposing portion 12d is disposed on the lower side. The leaf spring 12 further includes: two second opposing portions 12e disposed to face each other with a gap therebetween in the second direction; and a first connecting portion 12f connecting the first opposing portion 12c and the first opposing portion 12d. The first opposing portion 12c constitutes a part of a second connecting portion 12g connecting the two second opposing portions 12 e. In the present embodiment, the supported portion 12a is configured by the two first opposing

portions

12c, 12d and the first connecting portion 12f, and the supporting portion 12b is configured by the two second opposing portions 12e and the second connecting portion 12 g.

The supported portion 12a is disposed below the reflecting portion 9. The first opposing

portions

12c, 12d are formed in a flat plate shape. The first opposing

portions

12c, 12d are disposed such that the thickness direction of the first opposing

portions

12c, 12d substantially coincides with the up-down direction. The first opposing portion 12c is disposed on the upper side of the rotation shaft portion 15, and the first opposing portion 12d is disposed on the lower side of the rotation shaft portion 15. That is, the rotation shaft portion 15 is disposed between the two first opposing

portions

12c, 12d in the up-down direction. The first opposing portion 12c is disposed above the spring holding portion 13d, and the first opposing portion 12d is disposed below the spring holding portion 13 d. The lower end of the first opposing portion 12d is disposed above the lower surface of the bottom portion 13 c.

The first connecting portion 12f is formed in a flat plate shape. The first connecting portion 12f is disposed on one side of the two first opposing

portions

12c, 12d in the third direction, and connects one end of the first opposing portion 12c in the third direction and one end of the first opposing portion 12d in the third direction. Specifically, the first connecting portion 12f is disposed on the front side of the first opposing

portions

12c, 12d, and connects the front end of the first opposing portion 12c and the front end of the first opposing portion 12 d. The first connecting portion 12f is inclined so as to be directed downward with respect to one side directed in the third direction. Specifically, the first connecting portion 12f is inclined so as to be directed downward as being directed substantially toward the front side. The inclination angle of the first connecting portion 12f is substantially equal to the inclination angle of the tapered surface 13f of the fixed body 13.

First contact portions 12h that contact the rotation shaft portion 15 are formed in the first opposing

portions

12c, 12 d. The first contact portion 12h constitutes the other side portion of the first opposing

portion

12c, 12d in the third direction. That is, the first contact portion 12h constitutes a rear side portion of the first opposing

portions

12c, 12 d. The rotation shaft portion 15 is disposed between the two first contact portions 12h in the up-down direction. That is, the rotation shaft portion 15 is disposed between the other side portions of the first opposing

portions

12c, 12d in the third direction in the up-down direction.

The first contact portion 12h is in contact with the ball 32. Specifically, the first contact portion 12h of the first opposing portion 12c contacts the balls 32 disposed on the upper side from the upper side, and the first contact portion 12h of the first opposing portion 12d contacts the balls 32 disposed on the lower side from the lower side. The first contact portion 12h has a concave curved receiving surface 12j on which the ball 32 contacts.

The supported portion 12a biases the balls 32 toward the fixed body 13. Specifically, the supported portion 12a biases the balls 32 disposed on the upper side downward toward the spring holding portion 13d, and biases the balls 32 disposed on the lower side upward toward the spring holding portion 13 d. That is, the supported portion 12a biases the rotation shaft portion 15 in the up-down direction. Specifically, the supported portion 12a biases the rotation shaft portion 15 inward in the up-down direction.

The second opposing portion 12e is formed in a flat plate shape. The second opposing portion 12e is arranged such that the thickness direction of the second opposing portion 12e substantially coincides with the second direction. The second connecting portion 12g includes two curved portions 12k having a U-shape when viewed from the third direction. The second connecting portion 12g of the present embodiment is composed of a first opposing portion 12c and two curved portions 12k. The first opposing portion 12c is arranged between the two curved portions 12k in the second direction. The shape of the bent portion 12k as viewed from the third direction is a U shape with an upper end side opening.

The first opposing portion 12c is connected to one end of the bent portion 12k, and the second opposing portion 12e is connected to the other end of the bent portion 12k. The second opposing portion 12e is disposed at a position outside the first opposing portion 12c in the second direction. The second opposing portion 12e is disposed above the first opposing portion 12 c. The lower end of the bent portion 12k is disposed below the first opposing portion 12 c. The lower end of the bent portion 12k is disposed above the first opposing portion 12 d.

A second contact portion 12p that contacts the rotation shaft portion 16 is formed on the second opposing portion 12e. The second contact portion 12p constitutes an upper side portion of the second opposing portion 12e. The second contact portion 12p is in contact with the ball 34. Specifically, the second contact portion 12p of the second opposing portion 12e disposed on one side in the second direction contacts the ball 32 disposed on one side in the second direction from the other side in the second direction, and the second contact portion 12p of the second opposing portion 12e disposed on the other side in the second direction contacts the ball 34 disposed on the other side in the second direction from the one side in the second direction. The second contact portion 12p is formed with a concave curved receiving surface 12r for the balls 34 to contact. The second contact portion 12p is disposed in the recess 11c and in the holder 11. The second contact portion 12p is arranged at substantially the same position as the first contact portion 12h in the third direction.

The support portion 12b biases the balls 34 toward the reflecting portion 9. Specifically, the support portion 12b biases the balls 34 toward the outer side surface of the recess 11c in the second direction. That is, the support portion 12b biases the rotation shaft portion 16 in the second direction. Specifically, the support portion 12b biases the rotation shaft portion 16 to the outside in the second direction.

The leaf spring 12 is attached to a spring holding portion 13d of the fixed body 13 from the front side. At this time, the reflecting portion 9 in a state where the driving

magnets

23, 25, the

magnetic bodies

26, 27, and the rotating shaft portion 16 are attached is rotatably held by the plate spring 12. At this time, the plate spring 12 holds the balls 32 fixed to the ball fixing plate 31, and the balls 32 disposed on the upper side move along the tapered surface 13f of the spring holding portion 13d.

When the reflecting portion 9 and the leaf spring 12 are attached to the fixing body 13, the stopper 17 is inserted into the through hole 13g of the fixing body 13 from the lower side and fixed. Further, as described above, the stopper member 17 is fixed to the fixed body 13 at the rear side of the rotation shaft portion 15. That is, the stopper member 17 is fixed to the fixed body 13 on the other side (specifically, the rear side) of the two first opposing

portions

12c, 12d in the third direction.

(main effects of the present embodiment)

As described above, in the present embodiment, the plate spring 12 is rotatable with respect to the fixed body 13 in the axial direction in which the plate spring 12 is rotatable in the vertical direction, and the reflecting portion 9 is rotatable with respect to the plate spring 12 in the axial direction in which the plate spring is rotatable in the second direction orthogonal to the vertical direction. In the present embodiment, the leaf spring 12 is provided with a supported portion 12a and a supporting portion 12b, the supported portion 12a being rotatably supported by the fixed body 13 and biasing the rotating shaft portion 15 in the up-down direction, the supporting portion 12b rotatably supporting the reflecting portion 9 and biasing the rotating shaft portion 16 in the second direction. Therefore, in the present embodiment, the prism 10 can be rotated relative to the fixed body 13 by using a relatively simple structure of one leaf spring 12 and using the up-down direction and the second direction as the axial direction of rotation.

In the present embodiment, the first contact portion 12h of the leaf spring 12 is in contact with the balls 32 of the rotation shaft portion 15 from the outside in the up-down direction, and the second contact portion 12p of the leaf spring 12 is in contact with the balls 34 of the rotation shaft portion 16 from the inside in the second direction, so that it is possible to remove a member that impedes the rotation of the reflection portion 9 or the like, such as the rotation plate, the rotation holder, or the like of the camera module described in patent document 1. Therefore, in the present embodiment, the range of rotation of the plate spring 12 in the axial direction that rotates in the up-down direction with respect to the fixed body 13 can be widened, and the range of rotation of the reflecting portion 9 in the axial direction that rotates in the second direction with respect to the plate spring 12 can be widened. As a result, in the present embodiment, the structure of the optical unit 1 can be simplified and the rotation range of the prism 10 can be widened.

In the present embodiment, the second contact portion 12p and the rotation shaft portion 16 of the leaf spring 12 are disposed inside the holder 11. Therefore, in the present embodiment, the driving mechanism 14 is easily disposed on the outer peripheral side of the holder 11.

In the present embodiment, the first opposing portion 12c that forms part of the supported portion 12a forms part of the second connecting portion 12g, and the second connecting portion 12g forms part of the supporting portion 12 b. Therefore, in the present embodiment, even if the supported portion 12a and the supporting portion 12b are formed in the leaf spring 12, the structure of the leaf spring 12 can be simplified and the leaf spring 12 can be miniaturized. In the present embodiment, since the second connecting portion 12g includes two bent portions 12k, the spring constant of the support portion 12b can be reduced. Therefore, in the present embodiment, the variation in the biasing force of the support portion 12b can be suppressed.

In the present embodiment, the rotation shaft portion 15 and the rotation shaft portion 16 are arranged at the same position in the third direction, and pass through the vicinity of the center of gravity of the reflection portion 9 through the axis passing through the centers of the two balls 32 (i.e., the axis of the plate spring 12 with respect to the rotation center of the fixed body 13) and the axis passing through the centers of the two balls 34 (i.e., the axis of the reflection portion 9 with respect to the rotation center of the plate spring 12). Therefore, in the present embodiment, even when the reflecting portion 9 is rotated in the vertical direction as the axial direction of rotation, or when the reflecting portion 9 is rotated in the second direction as the axial direction of rotation, it is easy to smoothly rotate the reflecting portion 9.

In the present embodiment, the first opposing

portions

12c and 12d of the fixed portion 12a are disposed below the reflecting portion 9, but the first connecting portion 12f disposed on one side of the first opposing

portions

12c and 12d in the third direction is inclined so as to be directed downward with respect to one side in the third direction. Therefore, in the present embodiment, even if the rotation range of the reflecting portion 9 in the axial direction rotating in the second direction is widened, interference between the reflecting portion 9 and the first connecting portion 12f at the time of axial rotation of the reflecting portion 9 in the second direction relative to the plate spring 12 can be prevented.

In the present embodiment, the rotation shaft portion 15 is disposed between the other side portions of the first opposing

portions

12c, 12d in the third direction in the up-down direction, but the first connecting portion 12f is disposed on one side of the first opposing

portions

12c, 12d in the third direction, and the stopper member 17 is fixed to the fixed body 13 on the other side of the first opposing

portions

12c, 12d in the third direction. Therefore, in the present embodiment, the stopper member 17 can be disposed at a position closer to the rotation shaft portion 15 than in the case where the stopper member 17 is fixed to the fixed body 13 at one side of the first opposing

portions

12c, 12d in the third direction. In the present embodiment, since the rotation shaft portion 15 and the rotation shaft portion 16 are disposed at the same position in the third direction, the stopper member 17 can be disposed closer to the rotation shaft portion 16 than in the case where the stopper member 17 is fixed to the fixed body 13 on one side of the first opposing

portions

12c, 12d in the third direction.

Therefore, in the present embodiment, even if the gap between the holder 11 and the stopper member 17 and the gap between the magnetic plate 26 and the stopper member 17 are narrowed, the interference between the holder 11 and the stopper member 17 and the interference between the magnetic plate 26 and the stopper member 17 can be prevented when the reflecting portion 9 rotates in the up-down direction or the second direction as the axial direction of rotation. As a result, in the present embodiment, the interference between the retainer 11 and the stopper 17 and the interference between the magnetic plate 26 and the stopper 17 when the reflecting portion 9 rotates in the vertical direction or the second direction as the axial direction of rotation can be prevented, and the optical unit 1 can be miniaturized.

(other embodiments)

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

In the above embodiment, the support portion 12b may urge the balls 34 toward the inner side surface of the recess 11c in the second direction. In this case, the ball fixing plate 33 is fixed to the inner side surface of the recess 11c in the second direction, and the balls 34 are fixed to the outer side surface of the ball fixing plate 33 in the second direction. In the above embodiment, the supported portion 12a may apply force to the balls 32 toward the outer side in the up-down direction.

In the above embodiment, the rotation shaft portion 15 may not be provided with the ball fixing plate 31. In this case, the balls 32 are directly fixed to the spring holding portion 13d. Similarly, the rotation shaft portion 16 may not be provided with the ball fixing plate 33. In this case, the balls 34 are directly fixed to the cage 11. In the above embodiment, the balls 32 may be fixed to the leaf spring 12. In this case, for example, instead of the ball fixing plate 31, a member having a concave curved receiving surface on which the balls 32 are in contact may be fixed to the spring holding portion 13d. Likewise, the balls 34 may be fixed to the leaf spring 12. In this case, instead of the ball fixing plate 33, a member having a concave curved receiving surface on which the balls 34 are in contact may be fixed to the holder 11.

In the above embodiment, the rotation shaft portion 15 may be provided with a rotation shaft rotatably held by the spring holding portion 13d or fixed to the spring holding portion 13d, instead of the balls 32. In the above embodiment, the rotation shaft portion 16 may be provided with a rotation shaft rotatably held by the holder 11 or fixed to the holder 11, instead of the balls 34.

In the above embodiment, the first connecting portion 12f may be formed in a flat plate shape in which the thickness direction of the first connecting portion 12f coincides with the third direction, for example, as long as interference between the reflecting portion 9 and the first connecting portion 12f can be prevented. In the above embodiment, the second connecting portion 12g may not include the bent portion 12k. In this case, the second connecting portion 12g is formed in a flat plate shape in which the thickness direction of the second connecting portion 12g coincides with the up-down direction.

In the above embodiment, the first contact portion 12h and the second contact portion 12p may be arranged at positions offset from each other in the third direction. That is, in the above embodiment, the rotation shaft portion 15 and the rotation shaft portion 16 may be arranged at positions offset from each other in the third direction. In the above embodiment, the leaf spring 12 may be formed such that the first opposing portion 12c does not form a part of the second connecting portion 12 g.

In the above embodiment, the second contact portion 12p and the rotation shaft portion 16 may be disposed outside the holder 11. In the above embodiment, the axis passing through the centers of the two balls 32 may not coincide with the optical axis L1 of the lens 4. In the above embodiment, the optical unit 1 may be provided with a reflecting mirror having a reflecting surface for reflecting light incident from the outside, instead of the prism 10.

Claims

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

a reflection unit having a reflection member formed with a reflection surface for reflecting light incident from the outside;

a leaf spring rotatably holding the reflecting portion;

a fixing body that rotatably holds the leaf spring;

a drive mechanism that rotates the reflecting portion with respect to the plate spring and rotates the plate spring with respect to the fixed body;

a first rotation shaft portion that constitutes a rotation center of the leaf spring with respect to the fixed body; and

a second rotation shaft portion that constitutes a rotation center of the reflecting portion with respect to the plate spring,

The leaf spring is rotatable relative to the fixed body in an axial direction in which the leaf spring rotates in a first direction parallel to an incident direction of light to the reflecting surface,

the reflecting portion is rotatable relative to the leaf spring in an axial direction in which the reflecting portion rotates in a second direction orthogonal to the first direction,

the leaf spring is formed with a supported portion rotatably supported by the fixed body and biasing the first rotation shaft portion in a first direction, and a supporting portion rotatably supporting the reflecting portion and biasing the second rotation shaft portion in a second direction.

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

the first rotating shaft portion includes two first balls arranged in a first direction at a spaced apart state,

the second rotation shaft portion includes two spherical second balls arranged at intervals in a second direction,

the supported portion biases the first ball toward the fixed body,

the support portion biases the second ball toward the reflection portion.

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

The reflecting portion is provided with a holding member for fixing the reflecting member,

the second rotating shaft portion is disposed inside the holding member.

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

the leaf spring is provided with: two first opposing portions disposed to face each other with a space therebetween in the first direction; two second opposing portions disposed to face each other with a space therebetween in the second direction; and a first connecting portion connecting the two first opposing portions,

the first opposing portion of one of the two first opposing portions constitutes a part of a second connecting portion connecting the two second opposing portions,

the supported portion is constituted by two of the first opposing portions and the first connecting portion,

the support portion is constituted by the two second opposing portions and the second connecting portion.

5. The optical unit with shake correction function according to claim 4, wherein,

a first contact portion which is in contact with the first rotation shaft portion is formed at the first opposing portion,

a second contact portion that contacts the second rotation shaft portion is formed at the second opposing portion,

The first contact portion and the second contact portion are disposed at substantially the same position in a third direction orthogonal to the first direction and the second direction.

6. The optical unit with a shake correction function according to claim 4 or 5, characterized in that,

the second connecting portion has two curved portions having a U-shape when viewed from a third direction orthogonal to the first direction and the second direction,

the first opposing portion constituting a part of the second coupling portion is disposed between the two curved portions in the second direction.

7. The optical unit with a shake correction function according to any one of claims 4 to 6,

when the direction orthogonal to the first direction and the second direction is set as the third direction,

the supported portion is disposed on one side of the reflecting portion in the first direction,

the first connecting portion is disposed on one side of the two first opposing portions in the third direction, and is inclined so as to be directed to one side in the first direction as being directed to one side in the third direction.

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

The reflection part is provided with a stop member for preventing the reflection part from falling off to one side of the third direction relative to the fixed body,

the first rotating shaft portion is arranged between the other side portions of the two first opposing portions in the third direction in the first direction,

the first connecting portion is disposed at one side of the two first opposing portions in a third direction,

the stopper member is fixed to the fixed body at the other side of the first opposing portions in the third direction.