CN110967800A

CN110967800A - Lens driving device, camera device and electronic equipment

Info

Publication number: CN110967800A
Application number: CN201811147846.2A
Authority: CN
Inventors: 鷲尾紀之
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Technology Co Ltd
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2020-04-07
Anticipated expiration: 2038-09-29
Also published as: CN110967800B

Abstract

The invention provides a lens driving device, a camera device and an electronic device capable of stably moving a lens body. The lens driving device comprises a stator, a rotor and an elastic sheet, wherein the rotor can be used for fixing a lens supporting body of a lens body, the elastic sheet supports the rotor to freely move towards a first direction relative to the stator, the elastic sheet comprises a first fixing part, a second fixing part, a first wrist part and a second wrist part, the first fixing part is fixed on the stator at one end side of the elastic sheet in a second direction intersecting with the first direction, the second fixing part is fixed on the rotor at the other end side of the elastic sheet in the second direction, and the first wrist part and the second wrist part are respectively and elastically connected with the first fixing part and the second fixing part at two end sides of the elastic sheet in a third direction intersecting with the first direction and the second direction; the first and second arm portions and the mover are bridged by viscoelastic resin respectively.

Description

Lens driving device, camera device and electronic equipment

[ technical field ] A method for producing a semiconductor device

The invention relates to a lens driving device, a camera device and an electronic apparatus.

[ background of the invention ]

For example, as shown in patent document 1, a conventional lens driving device has a structure in which light from an object whose optical path is bent by a prism or the like is incident on an image sensor through a lens body. The photographic device comprises a lens driving device which enables a mover comprising a lens support body for fixing the lens body to move relative to the stator. The mover is supported by the elastic pieces at both sides thereof to be freely movable with respect to the moving direction. The elastic piece has a plurality of thin arm portions for coupling the lens support body and the stator, and the lens support body side of each arm portion is disposed around the central opening of the lens support body so as to surround the central opening.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] Chinese patent application having publication No. CN107357026A

[ summary of the invention ]

[ problem to be solved by the invention ]

In particular, the lens body in the camera device having the structure in which the optical path is bent as described above is heavier and moves a longer distance than the lens body in the camera device having the structure in which the optical path is not bent. Therefore, there is a problem that the stable lens body is difficult to move.

An object of the present invention is to solve the above-described conventional problems and to provide a lens driving device, a camera device, and an electronic apparatus, which can stably move a lens body.

[ technical solution ] A

One aspect of the present invention is a lens driving device including a stator, a mover including a lens support for fixing a lens body, and a spring plate supporting the mover to be movable in a first direction with respect to the stator. The spring plate includes a first fixing portion fixed to the stator at one end side of the spring plate in a second direction intersecting the first direction, a second fixing portion fixed to the mover at the other end side of the spring plate in the second direction, the first wrist portion elastically couples the first fixing portion and the second fixing portion at one end side of the spring plate in a third direction intersecting the first direction and the second direction, the second wrist portion elastically couples the first fixing portion and the second fixing portion at the other end side of the spring plate in the third direction, the first coupling portion couples the first wrist portion and the second wrist portion at a first fixing portion side located closer to the first fixing portion than the second fixing portion, the second coupling portion couples the first arm portion and the second arm portion to a second fixing portion side located closer to the second fixing portion than the first fixing portion, and the first arm portion and the second arm portion are bridged with the mover by a viscoelastic resin.

Preferably, the first arm portion and the second arm portion each include a branch portion extending in a branch, and the viscoelastic resin is provided in the branch portion.

Further, the branch portion is preferably provided on each of the first fixing portion side and the second fixing portion side, or between the first coupling portion and the second coupling portion.

Preferably, the branch portion and the mover include opposing surfaces that face each other, and the viscoelastic resin bridges the opposing surfaces. The opposing surfaces of both may oppose each other in the first direction, and the branch portion may be formed as a bent portion bent in the first direction and may oppose each other in a direction intersecting the first direction.

Further, it is preferable that the viscoelastic resin is provided at symmetrical positions. That is, the branch portions may be symmetrically provided on both sides of the third direction with respect to a line connecting centers of the first coupling portion and the second coupling portion in the third direction as an axis of symmetry, or may be symmetrically provided on both sides of the second direction with respect to a center line between the first coupling portion and the second coupling portion in the second direction as an axis of symmetry.

Preferably, a distance between the first arm portion and the second arm portion is shortest in a portion of the first coupling portion and the second coupling portion.

Another aspect of the present invention is a camera device including the lens body through which light from a subject passes, a light receiving sensor that receives the light passing through the lens body, and the lens driving device. Preferably, the photographing apparatus further includes an optical system bending light rays from the subject, the bent light rays passing through the lens body.

In still another aspect of the present invention, the present invention is an electronic apparatus equipped with the camera.

[ PROBLEMS ] the present invention

According to the present invention, the first arm portion, the second arm portion, and the mover are bridged by the viscoelastic resin, so that the lens body can be stably moved.

[ description of the drawings ]

Fig. 1 is an exploded perspective view of a photographic apparatus embodying an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a photographic apparatus according to an embodiment of the present invention, in a state where the photographic apparatus of fig. 1 is mounted.

Fig. 3 is a transverse sectional view of a photographic apparatus according to an embodiment of the present invention, in a state where the photographic apparatus of fig. 1 is mounted.

Fig. 4 is a front view of a lens driving device according to a first embodiment of the present invention.

Fig. 5 is an oblique view of a lens driving device according to a first embodiment of the present invention.

Fig. 6 is a side view of a main part of a lens driving device according to a first embodiment of the present invention.

Fig. 7 is a side view of a main part of a lens driving device according to a second embodiment of the present invention.

Fig. 8 is a front view of a lens driving device according to a third embodiment of the present invention.

Fig. 9 is an oblique view of a lens driving device according to a third embodiment of the present invention.

[ reference numerals ]

10 photographic device

12 frame body

14 main body part

16 upper cover

18 lower cover

20 first base

22 second base

24 light entrance window

26 prism assembly

28 lens assembly

30 prism

32 prism support

42 lens body

44 first lens support

46 second lens support

48 first shield member

50 second shield member

52 first lens driving device

54 second lens driving device

56 first coil

58 second coil

60 first magnet

62 second magnet

64 first spring plate

66 second elastic sheet

68 third coil

70 fourth coil

72 third magnet

74 fourth magnet

76 third spring plate

78 fourth spring plate

80 magnet for position detection

82 first fixed part

84 second fixed part

86 first wrist part

88 second wrist part

90 first part

92 second part

94 third part

96 first coupling part

98 second coupling part

100 branch part

102 resin having viscoelasticity

104a

104d opposite side

106 bending part

[ detailed description ] embodiments

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 to 3 show a camera 10 according to an embodiment of the present invention.

The camera apparatus 10 includes a frame 12. The housing 12 is composed of a main body 14, an upper cover 16, a lower cover 18, a first base 20, and a second base 22. The body 14 is open at the upper and lower portions in the Z-axis direction and at the front and rear portions in the X-axis direction. The upper cover 16 covers the upper side of the main body portion 14 except for the light entrance window 24. Further, the lower cover 18 covers the lower side of the main body portion 14. The first base 20 and the second base 22 are provided at the front end and the rear end of the main body 14 in the X-axis direction. An image sensor (not shown) is mounted through the second base 22.

In the present specification, the optical axis direction of the lens body 42 described later is an X-axis direction, a direction perpendicular to the X-axis is a Y-axis direction, and a direction perpendicular to the X-axis and the Y-axis is a Z-axis direction. One of the X-axis directions is defined as front and the other as rear, one of the Y-axis directions is defined as left and the other as right, and one of the Z-axis directions is defined as up and the other as down.

The camera device 10 includes a prism assembly 26 and a lens assembly 28. The prism assembly 26 is housed in the front side of the frame 12, and the lens assembly 28 is housed in the rear side of the frame 12.

The prism assembly 26 includes a prism 30 disposed below the light incident window 24. The prism 30 constitutes an optical member forming an optical system with a bent optical axis, and has a triangular cross section. The prism 30 has one surface facing the light entrance window 24 and the other surface facing the lens assembly 28, and the surface between the two surfaces forms a reflecting surface at an angle of 45 degrees. The prism 30 is fixed to a prism support 32. The prism 30 and the prism support 32 are rotatable about the Y-axis direction.

The light beam from the subject entering from the Z-axis direction through the light entrance window 24 is bent by 90 degrees in the X-axis direction by the prism 30 and sent to the lens assembly 28 side. At this time, when the prism 30 and the prism support 32 are rotated, the light beam emitted from the prism 30 vibrates in the Z-axis direction, and the light beam position in the Z-axis direction of the light beam incident on the image sensor is adjusted.

In the camera apparatus 10, the lens assembly 28 includes a lens body 42 for condensing light from the prism 30 to the image sensor. The lens body 42 is fixed to a first lens support 44. The second lens support 46 is provided around the first lens support 44 to surround the first lens support 44 in the front, rear, left, and right directions. The first shield member 48 and the second shield member 50 are fixed to the left and right of the second lens support 46. The first lens support 44 and the second lens support 46 constitute a first lens driving device 52. The second lens support 46 and the main body 14 of the housing 12 constitute a second lens driving device 54.

In the first lens driving device 52, a first coil 56 and a second coil 58 are fixed to both left and right sides of the first lens support 44. Further, a first magnet 60 and a second magnet 62 are fixed to the left and right of the second lens support 46 so as to face the first coil 56 and the second coil 58. The first elastic piece 64 and the second elastic piece 66 are coupled to the first lens support 44 and the second lens support 46 in front of and behind the first lens support 44. Therefore, the first lens support 44 is supported to be movable forward and backward with respect to the second lens support 46.

In the second lens driving device 54, the third coil 68 and the fourth coil 70 are fixed to the left and right of the second base 22 of the housing 12. Further, a third magnet 72 and a fourth magnet 74 are fixed to the left and right of the second lens support 46, opposite to the third coil 68 and the fourth coil 70. The third elastic piece 76 and the fourth elastic piece 78 couple the second lens support 46 and the frame 12 to the left and right of the second lens support 46. Therefore, the second lens support 46 is supported to be movable left and right with respect to the frame 12.

When current is applied to the first coil 56 and the second coil 58, a lorentz force in the X-axis direction acts on the first coil 56 and the second coil 58. The first lens support 44 moves in the X-axis direction relative to the second lens support 46 against the first spring 64 and the second spring 66. If the first lens support 44 is moved in the X-axis direction, the focus for the image sensor receiving the light passing through the lens body 42 is adjusted.

Further, a position detection magnet 80 is provided on, for example, the left side surface of the second lens support 46, and the position of the first lens support 44 in the X axis direction is detected by the position detection magnet 80.

When the third coil 68 and the fourth coil 70 are energized, a lorentz force in the Y-axis direction acts on the third coil 68 and the fourth coil 70, and a reaction force thereof acts on the third magnet 72 and the fourth magnet 74. When a force in the Y-axis direction acts on the third magnet 72 and the fourth magnet 74, the second lens support 46 moves in the Y-axis direction relative to the housing 12 against the third spring piece 76 and the fourth spring piece 78.

That is, the camera shake compensation is performed by the rotation of the prism 30 and the movement of the second lens support 46 in the Y-axis direction by the second lens driving device 54.

In the second lens driving device 54, the frame 12 belongs to the stator, and the second lens support 46 belongs to the mover. In the first lens driving device 52, the second lens support 46 belongs to the stator, and the first lens support 44 belongs to the mover.

Next, the support mechanisms of the first lens driving device 52 and the second lens driving device 54 will be described, but since the structures of the support mechanisms of the first lens driving device 52 and the second lens driving device 54 and the structures of the elastic pieces are substantially the same, the support mechanism of the first lens driving device 52, particularly the second elastic piece 66, will be described in detail herein.

Fig. 4 to 6 show a first embodiment of the first lens driving device 52. In this case, the X-axis direction corresponds to a first direction in which the mover moves, the Y-axis direction corresponds to a second direction intersecting the first direction, and the Z-axis direction corresponds to a third direction intersecting the first direction and the second direction.

The second resilient piece 66 is formed to have a first fixing portion 82 and a second fixing portion 84 at the left and right ends thereof extending in the Z-axis direction. The first fixing portion 82 is fixed to the second lens support 46 as a stator. The second fixing portion 84 is fixed to the first lens support 44 serving as the mover. The first fixing portion 82 and the second fixing portion 84 are elastically coupled by a first arm portion 86 and a second arm portion 88. The first arm portion 86 is provided on the upper end side, and the second arm portion 88 is provided on the lower end side. The first and

second arm portions

86, 88 include first, second and

third portions

90, 92, 94. The first portion 90 is coupled to an upper end or a lower end of the first fixing portion 82 and linearly extends obliquely downward or obliquely upward. The third portion 94 is coupled to an upper end or a lower end of the second fixing portion 82 and linearly extends obliquely downward or obliquely upward. The second portion 92 extends in an arc shape and connects a lower end or an upper end of the first portion 90 and a lower end or an upper end of the third portion 94. Since the first arm portion 86 and the second arm portion 88 have the curved shapes as described above, the stroke of elastic deformation can be made longer than when the first fixing portion 82 and the second fixing portion 84 are linearly connected.

The first coupling portion 96 couples the first arm portion 86 and the second arm portion 88 to a portion closest to the first arm portion 86 and the second arm portion 88, that is, a portion where the first portion 90 and the second portion 92 are coupled, on the first fixing portion 82 side located closer to the first fixing portion 82 than the second fixing portion 84. Similarly, the second coupling portion 98 couples the first arm portion 86 and the second arm portion 88 at a portion closest to the first arm portion 86 and the second arm portion 88, that is, at a portion where the second portion 92 and the third portion 94 are connected, on the second fixing portion 84 side located closer to the second fixing portion 84 than the first fixing portion 82. The first arm portion 86 and the second arm portion 88 are reinforced by being coupled via a first coupling portion 96 and a second coupling portion 98. Thus, by using the second elastic piece 66 having such a shape, the first arm portion 86 and the second arm portion 88 can be moved in a long stroke without being excessively deformed.

The branch portion 100 is provided so as to branch from the first arm portion 86 and the second arm portion 88. The branch portion 100 is provided at four places in this embodiment. Each of the branch portions 100 extends from the second portion 92 of the first arm portion 86 and the second arm portion 88 to the first fixing portion 82 or the second fixing portion 84. The upper and

lower branch portions

100, 100 are formed vertically symmetrically with respect to a line connecting the centers of the first coupling portion 96 and the second coupling portion 98 in the Z-axis direction as a symmetry axis, and the left and

right branch portions

100, 100 are formed horizontally symmetrically with respect to a center line between the first coupling portion 96 and the second coupling portion 98 as a symmetry axis.

The viscoelastic resin 102 bridges between the branch portion 100 and the first lens support 44. The resin 102 having viscoelasticity (for example, photo-curable acrylic resin and epoxy resin) is a resin that is applied at the time of manufacture and cured by, for example, ultraviolet rays. In this embodiment, the viscoelastic resin 102 is provided on the upper and lower two

branch portions

100, 100 on the second fixing portion 84 side, but may be provided on the upper and lower two

branch portions

100, 100 on the first fixing portion 82 side, or may be provided on all the four branch portions 100.

In this embodiment, the resin 102 having viscoelasticity is provided between the opposing

surfaces

104a and 104b in the X-axis direction between the branch portion 100 and the first lens support 44, as shown in fig. 6. By providing the viscoelastic resin 102 appropriately in this manner, even when a heavy mover is moved, the movement can be converged quickly. Further, by providing the branch portion 100, a viscoelastic resin 102 can be provided at an appropriate position. For example, as a second embodiment, as shown in fig. 7, the branch portion 100 may be provided between the opposing

surfaces

104c, 104d of the first lens support 44 in the Z-axis direction.

That is, in the second embodiment, the branch portion 100 extends in the Z-axis direction beyond the upper surface or the lower surface of the first lens support 44, and the extending portion is bent in the X-axis direction to form the bent portion 106. The inner surface of the bent portion 106 is an opposing surface 104c, and the viscoelastic resin 102 is provided between the opposing surface 104c and an opposing surface 104d formed on the first lens support 44 and opposing the opposing surface 104 c.

Fig. 8 and 9 show a third embodiment of the first lens driving device 52. In the third embodiment, the branch portion 100 shown in the first and second embodiments is not provided, and the viscoelastic resin 102 is directly provided on the first arm portion 86 and the second arm portion 88.

That is, the third portions 94 of the first and

second arm portions

86, 88 face the front surface of the first lens support 44, and the resin 102 having viscoelasticity is provided on the facing portions, and the resin 102 having viscoelasticity bridges between the first and

second arm portions

86, 88 and the first lens support 44.

In addition, the above description can be applied to the first lens driving device 52, and also to the second lens driving device 54.

Claims

1. A lens driving device is characterized by comprising

A stator;

a mover including a lens support for fixing the lens body; and

the elastic sheet supports the rotor to freely move towards a first direction relative to the stator;

the elastic sheet comprises a first fixing part, a second fixing part, a first wrist part, a second wrist part, a first connecting part and a second connecting part;

the first fixing part is fixed on the stator at one end side of the elastic sheet in a second direction intersecting the first direction, and the second fixing part is fixed on the mover at the other end side of the elastic sheet in the second direction;

the first wrist part is elastically connected with the first fixing part and the second fixing part at one end side of the elastic sheet in a third direction intersecting the first direction and the second direction, and the second wrist part is elastically connected with the first fixing part and the second fixing part at the other end side of the elastic sheet in the third direction;

the first coupling portion couples the first arm portion and the second arm portion to a first fixing portion side located closer to the first fixing portion than the second fixing portion, and the second coupling portion couples the first arm portion and the second arm portion to a second fixing portion side located closer to the second fixing portion than the first fixing portion;

the first and second arm portions and the mover are bridged by viscoelastic resin respectively.

2. The lens driving device according to claim 1, wherein: the first arm portion and the second arm portion each include a branch portion extending in a branch, and the viscoelastic resin is provided in the branch portion.

3. The lens driving device according to claim 2, wherein: the branch portion is provided on the first fixing portion side and the second fixing portion side, respectively.

4. The lens driving device according to claim 2, wherein: the branch portion is provided between the first coupling portion and the second coupling portion.

5. The lens driving device according to claim 2, wherein: the branch portion and the mover each include opposing surfaces that face each other, and the viscoelastic resin bridges the opposing surfaces.

6. The lens driving device according to claim 5, wherein: the opposing faces of both are opposed to each other in the first direction.

7. The lens driving device according to claim 5, wherein: the branch portion forms a bent portion bent in the first direction, the bent portion and the mover include opposing surfaces facing each other in a direction intersecting the first direction, and the viscoelastic resin bridges the opposing surfaces.

8. The lens driving device according to claim 2, wherein: the branch parts are symmetrically arranged on two sides of the third direction by taking a line connecting the centers of the first connecting part and the second connecting part in the third direction as a symmetry axis.

9. The lens driving device according to claim 2, wherein: the branch portions are symmetrically arranged on two sides of the second direction by taking a center line between the first connecting portion and the second connecting portion in the second direction as a symmetry axis.

10. The lens driving device according to claim 1, wherein: the distance between the first arm and the second arm is the shortest in the first coupling portion and the second coupling portion.

11. A camera device comprising the lens body through which light from a subject passes and a light receiving sensor that receives the light passing through the lens body, and the lens driving device according to any one of claims 1 to 10.

12. A camera device as claimed in claim 11, characterized in that: the optical system includes an optical system for bending the light beam from the subject, and the bent light beam passes through the lens body.

13. An electronic device comprising the camera of claim 11 or 12.