CN112540440A

CN112540440A - Lens driving device, camera device and electronic equipment

Info

Publication number: CN112540440A
Application number: CN201910837514.5A
Authority: CN
Inventors: 矢野智義; 鷲尾紀之; 内藤和彦
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Motor Co Ltd; New Shicoh Technology Co Ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2021-03-23

Abstract

Provided are a lens driving device, a camera device and an electronic device, wherein the lens body can be stably moved. Wherein the lens driving device includes: a stator having a mover of a lens support body for holding a lens body, and a plate spring for supporting the mover to be movable in a first direction with respect to the stator; the mover has a resin-disposed surface, and a resin having viscoelasticity is disposed in a direction intersecting the first direction, and bridges between the resin-disposed surface and the stator or the plate spring.

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 device.

[ background of the invention ]

As shown in patent document 1, the conventional camera apparatus operates on the following principle: light from an object that can bend light rays is incident on the image pickup element through the lens body by a prism or the like. The camera device has a lens driving device for moving a mover having a lens support body for holding the lens body relative to a stator.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] Japanese patent application laid-open No. 2018-010295

[ summary of the invention ]

[ problem to be solved by the invention ]

In particular, as described above, in a camera configured to bend light, the lens body has a large weight and a large moving distance, compared to the lens body in a camera configured to bend light. Therefore, there is a problem that the stable lens body is difficult to move.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a lens driving device, a camera, and an electronic apparatus capable of moving a lens body stably.

[ technical solution ] A

One embodiment of the present invention is a lens driving device including a stator, a mover having a lens support for holding a lens body, and a plate spring for supporting the mover to be movable in a first direction with respect to the stator, wherein the mover has a resin-disposed surface, a resin having viscoelasticity is disposed in a direction orthogonal to the first direction, and the resin-disposed surface is bridged between the stator and the plate spring.

Preferably, the resin disposition surface forms a protrusion protruding in the first direction on the mover.

Further, it is preferable that the resin having viscoelasticity is provided between the mover and the coupling portion or the arm portion constituting the plate spring.

Preferably, the coupling portion or the arm portion has a mover side surface facing the mover side, and the resin having viscoelasticity is disposed between the mover side surface and the resin disposition surface.

The resin having viscoelasticity is not limited to being disposed between the mover and the plate spring. For example, the coil may be disposed between a base to which the magnet and the coil are fixed and the mover, or between the coil and the magnet.

Another embodiment of the present invention is a camera including an optical system for refracting light from a subject, the lens body for guiding the refracted light therethrough, an image pickup device for receiving the light passing through the lens body, and any one of the lens driving devices.

Another embodiment of the present invention is an electronic device equipped with the camera.

[ PROBLEMS ] the present invention

According to the present invention, since the resin having viscoelasticity is provided along one direction in which the mover moves, the lens body can be stabilized and moved.

[ description of the drawings ]

Fig. 1 is an exploded perspective view of a camera according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing the lens driving device according to the embodiment of the present invention, showing the assembled state of the camera device of fig. 1.

Fig. 3 is a cross-sectional view showing an assembled state of the camera apparatus of fig. 1, illustrating a lens driving apparatus according to an embodiment of the present invention.

Fig. 4 is an oblique view showing a state where the body portion, the upper cover, and the lower cover of the housing are removed, as viewed obliquely from above, in the lens driving device according to the embodiment of the present invention.

Fig. 5 is a plan view showing a lens driving device according to an embodiment of the present invention, in which a body portion, an upper cover, and a lower cover of a housing are removed.

Fig. 6 is an oblique view showing a state where the body portion, the upper cover, and the lower cover of the housing are removed, as seen obliquely from below, in the lens driving device according to the embodiment of the present invention.

Fig. 7 is a rear view showing a lens driving device according to an embodiment of the present invention, in which a body portion, an upper cover, and a lower cover of a housing are removed.

Fig. 8 is a front view showing a plate spring used in the lens driving device according to the embodiment of the present invention.

Fig. 9 is a perspective view of an electrical system used in the lens driving device according to the embodiment of the present invention, as viewed from the side.

Fig. 10 is a perspective view of an electrical system used in the lens driving device according to the embodiment of the present invention, as viewed from below.

Fig. 11 is a perspective view of the resin having viscoelasticity according to the first embodiment of the present invention, as viewed from obliquely above, and shows a state where the resin having viscoelasticity is removed.

Fig. 12 is a perspective view of the resin having viscoelasticity according to the first embodiment of the present invention, as viewed from obliquely above, and shows a state in which the resin having viscoelasticity is disposed.

Fig. 13 is a perspective view of the resin having viscoelasticity according to the second embodiment of the present invention, as viewed obliquely from below, showing a state where the resin having viscoelasticity is removed.

Fig. 14 is a perspective view of the resin having viscoelasticity according to the second embodiment of the present invention, as viewed obliquely from below, and shows a state in which the resin having viscoelasticity is arranged.

Fig. 15 is a plan view for explaining the viscoelastic resin according to the third and fourth embodiments of the present invention, and shows a state where the viscoelastic resin is removed.

Fig. 16 is a plan view for explaining a viscoelastic resin according to a third embodiment of the present invention, and shows a state in which the viscoelastic resin is disposed.

Fig. 17 is a plan view for explaining a viscoelastic resin according to a fourth embodiment of the present invention, and shows a state in which the viscoelastic resin is disposed.

[ NUMBER DEFINITION ]

10 photographic device

12 frame body

14 body part

16 upper cover

18 lower cover

20 first base station

22 second base station

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 part

50 second shield part

52 first lens driving device

54 second lens driving device

56 first coil

58 second coil

60 first magnet

62 second magnet

64 first leaf spring

66 second leaf spring

68 third coil

70 fourth coil

72 third magnet

74 fourth magnet

76 third leaf spring

78 fourth leaf spring

80 magnet for position detection

82 first fixed part

84 second fixed part

86 first arm part

88 second arm part

90 ring-shaped part

96 first coupling part

98 second coupling part

100 first flexible substrate

102 second flexible substrate

104 substrate support part

106 third flexible substrate

108 resin having viscoelasticity

110 projection

112 resin disposition surface

114 first projection

116 second projection

[ detailed description ] embodiments

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

Fig. 1 to 7 show a camera 10 according to an embodiment of the present invention.

The camera device 10 has 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 upper and lower portions of the main body 14 in the Z-axis direction and the front and rear portions in the X-axis direction are opened. The upper cover 16 covers the upper portion of the body portion 14 except for the light entrance window 24. And a lower cover 18 covers a lower portion of the body portion 14. Thus, 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 imaging element (not shown) can be mounted on the second base 22.

In this specification, the optical axis direction of the lens body 42 described later is referred to as an X-axis direction, a direction orthogonal to the X-axis direction is referred to as a Y-axis direction, and a direction orthogonal to the X-axis and the Y-axis is referred to as a Z-axis direction. One side of the X axis direction is taken as front (-X direction), the other side as rear (+ X direction), one side of the Y axis is taken as left, the other side as right, one side of the Z axis is taken as up, and the other side as down. Light from an object enters from the upper side in the Z-axis direction and is focused on an imaging element provided on the rear side in the X-axis direction.

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 has a prism 30 disposed below the light entrance window 24. The prism 30 constitutes an optical member of an optical system that bends an optical axis, and has a triangular cross section. One surface of the prism 30 faces the light entrance window 24 and the other surface faces the lens assembly 28, and the surface between the two surfaces forms a reflection 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 freely rotatable around the Y-axis direction.

Light from the subject entering from the Z-axis direction through the light entrance window 24 is transmitted to the lens assembly 28 side bent at 90 degrees in the X-axis direction by the prism 30. Accordingly, the rotating prism 30 and the prism support 32 shift the light emitted from the prism 30 in the Z-axis direction, and adjust the position of the light incident on the imaging element in the Z-axis direction.

In the camera apparatus 10, the lens assembly 28 has a lens body 42, and focuses light emitted from the prism 30 on the image pickup device. The lens body 42 is fixed to a first lens support 44. Around the first lens support 44, a second lens support 46 is provided so as to surround the front, rear, left, and right of the first lens support 44. The first shield member 48 and the second shield member 50 are fixed to the right and left sides 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, the first coil 56 and the 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 and

second leaf springs

64 and 66 as the supporting means are coupled to the first and second lens supports 44 and 46 in the front and rear of the first lens support 44. Thereby, the first lens support 44 is supported and can move 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 both the left and right sides 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 plate spring 76 and the fourth plate spring 78 as the supporting means are coupled to the second lens support 46 and the housing 12 on the left and right of the second lens support 46. Thereby, the second lens support 46 is supported so as to be movable left and right with respect to the housing.

When the first coil 56 and the second coil 58 are energized, the first coil 56 and the second coil 58 generate a lorentz force in the X-axis direction. The first lens support 44 is moved in the X-axis direction with respect to the second lens support 46 against the first leaf spring 64 and the second leaf spring 66. If the first lens support 44 is moved in the X-axis direction, the focus of the light passing through the lens body 42 can be adjusted.

A position detection magnet 80 is provided on 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, the third coil 68 and the fourth coil 70 generate a lorentz force in the Y-axis direction. The third magnet 72 and the fourth magnet 74 generate reaction forces thereof. If a force acts in the Y-axis direction, the third and

fourth magnets

72, 74 move the second lens support 46 in the Y-axis direction relative to the housing 12 against the third and

fourth leaf springs

76, 78. In this case, if the second lens support 46 supporting the first lens support 44 is moved in the Y-axis direction, the light emitted from the lens body 42 is shifted in the Y-axis direction, and the position of the light incident on the image pickup device in the Y-axis direction can be adjusted.

That is, the anti-shake correction 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 this case, 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.

The first, second, third and

fourth leaf springs

64, 66, 76, 78 have the same shape, with a representative third leaf spring 76 being illustrated in fig. 8.

The third leaf spring 76 is formed at the front-rear direction end portion, and extends the first fixing portion 82 and the second fixing portion 84 in the Z-axis direction. The first fixing portion 82 is fixed to the prism support 32, which is a stator. The second fixing portion 84 is fixed to the second lens support 46, which is a 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 arm portion 86 and the second arm portion 88 assume a curved shape, and therefore the stroke of the elastic deformation can be elongated as compared with the case where they are linearly connected to the first fixing portion 82 and the second fixing portion 84.

The first coupling portion 96 is coupled to the first arm portion 86 and the second arm portion 88 at a portion closer to the first fixed portion 82 than the second fixed portion 84 and closest to the first arm portion 86 and the second arm portion 88. Similarly, the second coupling portion 98 is coupled to the first arm portion 86 and the second arm portion 88 at a portion on the second fixed portion 84 side closer to the second fixed portion 84 than the first fixed portion 82 and closest to the distance between the first arm portion 86 and the second arm portion 88. The first arm portion 86 and the second arm portion 88 are coupled by a first coupling portion 96 and a second coupling portion 98, thereby being reinforced. By adopting the third leaf spring 76 having such a shape, the entire shape is fixed at one end, and the first arm portion 86 and the second arm portion 88 are not excessively deformed, so that the second lens support 46 can be moved in a long stroke.

The first arm portion 86, the second arm portion 88, the first coupling portion 96, and the second coupling portion 98 are formed in a substantially circular shape, constituting the annular portion 90.

Next, an electrical system will be described with reference to fig. 9 and 10.

One end of the first flexible substrate 100 is fixed to the left side surface of the second base 22, and the other end extends forward. The first flexible board 100 is bent forward, extends rearward, and straddles the annular portion 90 of the third plate spring 76. Further, the portion extending rearward from the first flexible substrate 100 is bent, extends forward, and passes over the rear portion of the first shield member 48. The portion of the first flexible substrate 100 extending forward is continuous with the second flexible substrate 102. One end of the second flexible substrate 102 is fixed to a substrate support portion 104 fixed to the second lens support 46. The other end of the second flexible substrate 102 extends across the lower end of the substrate support 104 toward the first lens support 44 and is connected to the third elastic support 106. The third flexible board 106 is fixed to the first lens support 44, and a position detector including a hall element or the like is provided on the third flexible board 106, and the position of the position detection magnet 80 can be detected by the position detector. In addition, the first coil 56 is continuous with the third flexible substrate 106.

The resin 108 having viscoelasticity will be described below.

Fig. 11 and 12 show a first embodiment of the resin 108 having viscoelasticity.

The resin 108 having viscoelasticity is, for example, an acrylate, epoxy, silicone (silicone) resin, and is cured by light, heat, or anaerobic reaction. The resin 108 having viscoelasticity is applied at the time of manufacture and cured by, for example, ultraviolet rays. The resin 108 having viscoelasticity is in a gel state and is very soft, that is, a resin which exhibits a so-called damper function.

A viscoelastic resin 108 is disposed to bridge the gap between the first shield member 48 and the third leaf spring 76. In the center of the front end of the first cover member 48, a projection 110 projects to the left (Y side) from the main body of the center of the front end, and a resin disposition surface 112 is formed on the rear surface of the projection 110. A viscoelastic resin 108 is disposed so as to bridge the resin disposition surface 112 and the first coupling portion 96 of the third leaf spring 76. The viscoelastic resin 108 further contacts the left surface of the body of the first shield member 48, the right surface of the first coupling portion 96 of the third leaf spring 76, and the front surface thereof. The left side surface of the body of the first shield member 48 faces the right side surface of the first coupling portion 96 of the third leaf spring 76, and the resin disposition surface 112 of the projection 110 faces the front side surface of the first coupling portion 96 of the third leaf spring 76. The first coupling portion 96 of the third leaf spring 76 is slightly lower than the height of the tip of the protrusion 110, and the viscoelastic resin 108 comes into contact therewith, including the first coupling portion 96. Or slightly below the height of the top of the protrusion 110.

Since the viscoelastic resin 108 is provided as the mover and the first cover member 48 and the third leaf spring 76 are coupled to each other, vibration of the heavy mover can be quickly reduced when the mover is moved in the ± Y directions.

Fig. 13 and 14 show a second embodiment of the resin 108 having viscoelasticity.

In the second embodiment, a resin 108 having viscoelasticity is disposed, and the second shield member 50 and the fourth plate spring 78 are coupled to each other. A first projection 114 is formed at the center of the front end of the second cover member 50 and projects rightward (+ Y side) from the main body, and a second projection 116 is similarly formed above and below the front end of the second cover member 50 and projects rightward (+ Y side). The resin disposition surface 112 is formed on the rear-side surfaces of the first protruding portion 114 and the second protruding portion 116. The resin 108 having viscoelasticity is disposed on the first protruding portion 114, and the resin disposition surface 112 of the first protruding portion 114 and the first coupling portion 96 of the fourth plate spring 78 are coupled to each other. The viscoelastic resin 108 further contacts the right-side surface of the body of the second shield member 50, and the left-side surface and the front-side surface of the first coupling portion 96 of the fourth plate spring 78. The body of the second shield member 50 has a surface facing the right side and a surface facing the left side of the first coupling portion 96 of the fourth plate spring 78, and the resin disposition surface 112 of the first projection 114 faces the front surface of the first coupling portion 96 of the fourth plate spring 78. The first coupling portion 96 of the fourth plate spring 78 is slightly lower than the height of the tip of the first protrusion 114, and the viscoelastic resin 108 is in contact therewith, including the first coupling portion 96. Or may be slightly lower than the height of the top end of the first protrusion 114.

Further, the resin 108 having viscoelasticity is disposed in the second protruding portion 116, and the resin disposition surface 112 of the second protruding portion 116 and the first arm portion 86 and the second arm portion 88 of the fourth plate spring 78 are coupled to each other. The resin 108 having viscoelasticity further contacts the right-side surface of the body of the second shroud member 50. And contacts the left and front faces of the first arm portion 86 of the fourth leaf spring 78. Further, the second arm portion 88 is in contact with the surface facing the left side thereof and the surface facing the lower front side. The body of the second shield member 50 has a surface facing the right side facing the left side surfaces of the first arm portion 86 and the second arm portion 88 of the fourth leaf spring 78, and the resin disposition surface 112 of the second projection 116 faces the upward front surface of the first arm portion 86 and the downward front surface of the second arm portion 88 of the fourth leaf spring 78. The first arm portion 86 and the second arm portion 88 are slightly lower than the height of the tip of the second projection 116, and the viscoelastic resin 108 comes into contact therewith, including the first arm portion 86 and the second arm portion 88. Or may be slightly lower than the height of the top end of the second protrusion 116.

In the second embodiment, the second cover member 50 and the fourth plate spring 78 are coupled at 3 points by the viscoelastic resin 108, and therefore, compared to the first embodiment, the vibration of the mover can be reduced more quickly.

Fig. 15 and 16 show a third embodiment of the resin 108 having viscoelasticity.

A viscoelastic resin 108 is disposed to connect the second base 22 and the second lens support 46. The front end surface of the second base 22 and the rear end surface of the second lens support 46 face each other through a space, and each form a resin disposition surface 112. The resin 108 having viscoelasticity is provided between the resin disposition surface 112 of the second base 22 and the resin disposition surface 112 of the second lens support 46. In the third embodiment, the Y-directional mover vibration can be reduced by the resin 108 having viscoelasticity.

In the third embodiment, the resin 108 having viscoelasticity is disposed on the right end surfaces of the second base 22 and the second lens support 46, but if the second base 22 and the second lens support 46 are opposed surfaces, they may be disposed at any position, and may be disposed at a plurality of positions without being disposed at one position.

Fig. 17 shows a fourth embodiment of the resin 108 having viscoelasticity.

A viscoelastic resin 108 is disposed to couple the fourth coil 70 (or the third coil 68) fixed to the second base 22 and the fourth magnet 74 (or the third magnet 72) fixed to the second lens support 46. The fourth coil 70 and the fourth magnet 74 face each other through a space, and form resin disposition surfaces 112, respectively. The resin 108 having viscoelasticity is provided between the resin arrangement end face 112 of the fourth coil 70 and the resin arrangement face 112 of the fourth magnet 74. In the fourth embodiment, the Y-directional mover vibration can be reduced by the resin 108 having viscoelasticity.

In the fourth embodiment, similarly to the third embodiment, the fourth coil 70 (or the third coil 68) and the fourth magnet 74 (or the third magnet 72) may be disposed at any position if they are opposed surfaces, or may be disposed at a plurality of positions without being disposed at one position.

In the above embodiment, the resin 108 having viscoelasticity is provided between the second lens support 46 and the third plate spring 76, the fourth plate spring 78, or the stator, but the present invention is not limited thereto, and may be provided between the first lens support 44 and the first plate spring 64, the second plate spring 66, or the second lens support 46.

Claims

1. A lens driving device comprising:

a stator;

a mover having a lens support for holding the lens body;

a plate spring supporting the mover to be freely movable in a first direction with respect to the stator;

the method is characterized in that:

the mover has a resin-disposed surface, and a resin having viscoelasticity is disposed in a direction intersecting the first direction, and bridges between the resin-disposed surface and the stator or the plate spring.

2. The lens driving device according to claim 1, wherein: the resin arrangement surface is formed on the mover at a protruding portion protruding in the first direction.

3. The lens driving device according to claim 2, wherein:

the plate spring has a first fixed portion, a second fixed portion, a first arm portion, a second arm portion, a first coupling portion, and a second coupling portion;

the first fixing portion is fixed to the stator at one end side of the plate spring in a second direction intersecting the first direction, and the second fixing portion is fixed to the mover at the other end side of the plate spring in the second direction;

the first arm portion is on one end side of the plate spring in a third direction intersecting the first direction and the second direction and elastically couples the first fixing portion and the second fixing portion, and the second arm portion is on the other end side of the plate spring in the third direction and elastically couples the first fixing portion and the second fixing portion;

the first coupling portion is coupled to the first arm portion and the second arm portion respectively on a first fixing portion side located closer to the first fixing portion than the second fixing portion, and the second coupling portion is coupled to the first arm portion and the second arm portion respectively on a second fixing portion side located closer to the second fixing portion than the first fixing portion,

the resin having viscoelasticity bridges between the resin disposition surface and the first coupling portion.

4. The lens driving device according to claim 3, wherein: the first coupling portion has a mover side surface facing the mover, and the viscoelastic resin bridges a gap between the resin placement surface and the mover side surface.

5. The lens driving device according to claim 2, wherein:

the first fixing portion is fixed to the stator at one end side of the plate spring in a second direction intersecting the first direction, and the second fixing portion is fixed to the mover at the other end side of the plate spring in the second direction,

the resin having viscoelasticity bridges between the resin disposition surface and at least one of the first arm portion and the second arm portion.

6. The lens driving device according to claim 5, wherein: at least one of the first arm and the second arm has a mover side surface facing the mover side, and the resin having viscoelasticity bridges the resin placement surface and the mover side surface.

7. The lens driving device according to claim 1, wherein: the stator includes a base that fixes one of the magnet and the coil, the lens support that fixes the other of the magnet and the coil, and the base and the lens support that form opposing surfaces facing each other in a direction intersecting the first direction, the viscoelastic resin being disposed so as to bridge the opposing surfaces.

8. The lens driving device according to claim 1, wherein: the stator is fixed with one of a magnet and a coil, the mover is fixed with the other of the magnet and the coil, the magnet and the coil form opposite surfaces which face each other, the resin with viscoelasticity is arranged, and the opposite surfaces of the magnet and the coil are bridged.

9. A camera apparatus, comprising:

an optical system that bends light from an object;

the lens body guiding the bent light to pass through;

an image pickup element that receives the light passing through the lens body;

characterized in that it further comprises a lens driving device according to any one of claims 1 to 8.

10. An electronic device characterized by comprising the photographic apparatus according to claim 9.