Lens driving device, photographic device, and electronic equipment

Abstract

Provided are a lens driving device, a photographic device, and an electronic device that can stably hold a lens body and move the same. The lens driving device includes: a stator, a mover having a lens support body for holding the lens body, and a leaf spring that supports the mover so as to be freely movable relative to the stator in a first direction; the mover has a resin arrangement surface, and a resin having viscoelasticity is arranged in a direction intersecting the first direction, bridging between the resin arrangement surface and the stator or the leaf spring.

Description

Technical Field

[0001] The present invention relates to a lens driving device, a photographic device, and an electronic device.

Background Art

[0002] As shown in Patent Document 1, in a conventional photographic device, the working principle is as follows: Light from a subject that can bend light passes through a lens body through a prism or the like and is incident on an imaging element. The photographic device has a lens driving device that moves a mover having a lens support for holding the lens body relative to a stator.

[0003]

Prior Art Documents

[0004]

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006]

Technical Problem to be Solved by the Invention

[0007] In particular, as described above, compared with the lens body in a photographic device having a structure that does not bend light, in a photographic device having a structure that bends light, the lens body is heavy and its moving distance is also large. Therefore, there is a problem that it is difficult to move the lens body stably.

[0008] The present invention aims to solve the above-mentioned conventional problems, and provides a lens driving device, a photographic device, and an electronic device that can stabilize the lens body and move it.

[0009]

Technical Solution

[0010] One embodiment of the present invention is a lens driving device, which includes a stator, a mover having a lens support for holding a lens body, and a leaf spring that supports the mover to freely move relative to the stator in a first direction. The mover has a resin arrangement surface, and a resin having viscoelasticity is arranged in a direction orthogonal to the first direction to bridge between the resin arrangement surface and the stator or the leaf spring.

[0011] Preferably, the resin arrangement surface forms a protrusion protruding in the first direction on the mover.

[0012] In addition, preferably, the resin having viscoelasticity is provided between the mover and a connecting portion or an arm portion constituting the leaf spring.

[0013] In addition, preferably, the connecting portion or the arm portion has a mover side surface facing the mover, and a resin having viscoelasticity is arranged between the mover side surface and the resin arrangement surface.

[0014] The viscoelastic resin is not limited to being disposed between the mover and the leaf spring. For example, it may also be disposed between the base on which either the magnet or the coil is fixed and the mover, or between the coil and the magnet.

[0015] Another embodiment of the present invention is a photographic apparatus, which includes an optical system that bends light from a subject, a lens body that guides the bent light therethrough, an imaging element that receives the light passing through the lens body, and any one of the lens driving devices described above.

[0016] Another embodiment of the present invention is an electronic device equipped with the photographic apparatus.

[0017]

Advantageous Effects

[0018] According to the present invention, along one direction of movement of the mover, by providing a viscoelastic resin, the lens body can be stabilized and moved.

Description of the Drawings

[0019]

Figure 1

[0020]

Figure 2

[0021]

Figure 3

[0022]

Figure 4

[0023]

Figure 5

[0024]

Figure 6

[0025]

Figure 7

[0026]

Figure 8

[0027]

Figure 9

[0028]

Figure 10

[0029]

Figure 11

[0030]

Figure 12

[0031]

Figure 13

[0032]

Figure 14

[0033]

Figure 15

[0034]

Figure 16

[0035]

Figure 17

[0036]

Numerical Explanation

[0037] 10 Camera device

[0038] 12 Housing

[0039] 14 Body part

[0040] 16 Upper cover

[0041] 18 Lower cover

[0042] 20 First base

[0043] 22 Second base

[0044] 24 Light incident window

[0045] 26 Prism assembly

[0046] 28 Lens assembly

[0047] 30 Prism

[0048] 32 Prism support

[0049] 42 Lens body

[0050] 44 First lens support

[0051] 46 Second lens support

[0052] 48 First shield component

[0053] 50 Second shield component

[0054] 52 First lens drive device

[0055] 54 Second lens drive device

[0056] 56 First coil

[0057] 58 Second coil

[0058] 60 First magnet

[0059] 62 Second magnet

[0060] 64 First leaf spring

[0061] 66 Second leaf spring

[0062] 68 Third coil

[0063] 70 Fourth coil

[0064] 72 Third magnet

[0065] 74 Fourth magnet

[0066] 76 Third leaf spring

[0067] 78 Fourth leaf spring

[0068] 80 Position detection magnet

[0069] 82 First fixing part

[0070] 84 Second fixing part

[0071] 86 First arm part

[0072] 88 Second arm part

[0073] 90 Ring part

[0074] 96 First connecting part

[0075] 98 Second connecting part

[0076] 100 First flexible substrate

[0077] 102 Second flexible substrate

[0078] 104 Substrate support part

[0079] 106 Third flexible substrate

[0080] 108 Viscoelastic resin

[0081] 110 Protrusion

[0082] 112 Resin arrangement surface

[0083] 114 First protrusion

[0084] 116 Second protrusion

Detailed implementation manners

[0085] The implementation forms of the present invention will be described according to the drawings.

[0086] In Figures 1 to 7 the photographic apparatus 10 related to the implementation form of the present invention is shown.

[0087] The photographic apparatus 10 has a housing 12. The housing 12 is composed of a main body part 14, an upper cover 16, a lower cover 18, a first base 20, and a second base 22. The upper and lower parts of the main body part 14 in the Z-axis direction and the front and rear parts in the X-axis direction are in an open state. The upper cover 16 covers the upper part of the main body part 14 except for the light incident window 24. Moreover, the lower cover 18 covers the lower part of the main body part 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 part 14 in the X-axis direction. Through the second base 22, an imaging element (not shown) can be installed.

[0088] In this specification, the optical axis direction of the lens body 42 described later is taken as the X-axis direction, the direction orthogonal to the X-axis direction is taken as the Y-axis direction, and the direction orthogonal to both the X-axis and the Y-axis is taken as the Z-axis direction. Also, one side in the X-axis direction is taken as the front (-X direction), the other side is taken as the rear (+X direction), one side of the Y-axis is taken as the left, the other side is taken as the right, one side of the Z-axis is taken as the upper, and the other side is taken as the lower. Light from the subject enters from the upper side in the Z-axis direction and is focused on the imaging element provided at the rear side in the X-axis direction.

[0089] The photographic apparatus 10 includes a prism assembly 26 and a lens assembly 28. The prism assembly 26 is accommodated in the front side of the housing 12, and the lens assembly 28 is accommodated in the rear side of the housing 12.

[0090] The prism assembly 26 has a prism 30 provided below the light incident window 24. The prism 30 constitutes an optical component of an optical system that forms a bent optical axis and has a triangular cross-section. One surface of the prism 30 faces the light incident window 24, the other surface faces 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 the prism support 32. The prism 30 and the prism support 32 can freely rotate around the Y-axis direction.

[0091] Light from the subject that enters from the Z-axis direction through the light incident window 24 is transmitted to the lens assembly 28 side that is bent by 90 degrees toward the X-axis direction through the prism 30. Thus, by rotating the prism 30 and the prism support 32, the light emitted from the prism 30 is offset in the Z-axis direction, and the position of the light in the Z-axis direction incident on the imaging element is adjusted.

[0092] In the photographic apparatus 10, the lens assembly 28 has a lens body 42 that focuses the light emitted from the prism 30 on the imaging element. The lens body 42 is fixed to the first lens support 44. Around the first lens support 44, a second lens support 46 is provided 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 left and right of the second lens support 46. The first lens support 44 and the second lens support 46 constitute the first lens driving device 52. In addition, the second lens support 46 and the main body portion 14 of the housing 12 constitute the second lens driving device 54.

[0093] In the first lens driving device 52, the first coil 56 and the second coil 58 are fixed to the left and right sides of the first lens support 44. In addition, opposite to the first coil 56 and the second coil 58, the first magnet 60 and the second magnet 62 are fixed to the left and right of the second lens support 46. The first leaf spring 64 and the second leaf spring 66 as the support devices are connected to the first lens support 44 and the second lens support 46 before and after the first lens support 44. Thus, the first lens support 44 is supported and can move back and forth relative to the second lens support 46.

[0094] In addition, in the second lens driving device 54, the third coil 68 and the fourth coil 70 are fixed to the left and right sides of the second base 22 of the housing 12. In addition, opposite to the third coil 68 and the fourth coil 70, the third magnet 72 and the fourth magnet 74 are fixed to the left and right of the second lens support 46. The third leaf spring 76 and the fourth leaf spring 78 as the support devices are connected to the second lens support 46 and the housing 12 on the left and right of the second lens support 46. Thus, the second lens support 46 is supported and can move left and right relative to the housing.

[0095] 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 resists against the first leaf spring 64 and the second leaf spring 66 and moves in the X-axis direction relative to the second lens support 46. If the first lens support 44 moves in the X-axis direction, the focus of the light receiving imaging element that passes through the lens body 42 can be adjusted.

[0096] 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.

[0097] In addition, 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 a reaction force. If the third magnet 72 and the fourth magnet 74 generate a force in the Y-axis direction, the second lens support 46 resists against the third leaf spring 76 and the fourth leaf spring 78 and moves in the Y-axis direction relative to the housing 12. In this case, if the second lens support 46 that supports the first lens support 44 moves in the Y-axis direction, the light emitted from the lens body 42 is offset in the Y-axis direction, and the position of the light incident on the imaging element in the Y-axis direction can be adjusted.

[0098] That is, through 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, shake correction is performed.

[0099] In this case, in the second lens driving device 54, the housing 12 belongs to the stator and the second lens support 46 belongs to the mover. Further, 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.

[0100] The first leaf spring 64, the second leaf spring 66, the third leaf spring 76, and the fourth leaf spring 78 have the same shape. Figure 8 A representative third leaf spring 76 is shown.

[0101] The third leaf spring 76 is formed at the front-rear direction ends, causing the first fixing portion 82 and the second fixing portion 84 to extend in the Z-axis direction. The first fixing portion 82 is fixed to the prism support 32 which is the stator. The second fixing portion 84 is fixed to the second lens support 46 which is the mover. The first fixing portion 82 and the second fixing portion 84 are elastically connected by the first arm portion 86 and the 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 have a bent shape, so that compared with being linearly connected to the first fixing portion 82 and the second fixing portion 84, the stroke of elastic deformation can be lengthened.

[0102] The first connecting portion 96 is connected to the first arm portion 86 and the second arm portion 88 at a portion of the first fixing portion 82 side closer to the first fixing portion 82 than the second fixing portion 84 and where the distance between the first arm portion 86 and the second arm portion 88 is the closest. The same applies to the second connecting portion 98, which is connected to the first arm portion 86 and the second arm portion 88 at a portion of the second fixing portion 84 side closer to the second fixing portion 84 than the first fixing portion 82 and where the distance between the first arm portion 86 and the second arm portion 88 is the closest. The first arm portion 86 and the second arm portion 88 are connected by the first connecting portion 96 and the second connecting portion 98, thereby being strengthened. By adopting the third leaf spring 76 of this shape, a shape with one end fixed is formed as a whole, and the first arm portion 86 and the second arm portion 88 will not be overly deformed, so that the second lens support 46 can be moved with a long stroke.

[0103] The first arm portion 86, the second arm portion 88, the first connecting portion 96, and the second connecting portion 98 form a substantially circular shape, constituting a ring portion 90.

[0104] The following refers to Figure 9 and Figure 10 to describe the electrical system.

[0105] 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 front of the first flexible substrate 100 is bent, extends rearward, and crosses the annular portion 90 of the third leaf spring 76. Then, it is bent from the portion extending rearward of the first flexible substrate 100, extends forward, and crosses the rear portion of the first shield member 48. The portion of the first flexible substrate 100 extending forward is connected to the second flexible substrate 102. One end of the second flexible substrate 102 is fixed to the substrate support portion 104 fixed to the second lens support 46. The other end of the second flexible substrate 102 crosses the lower end of the substrate support 104, extends toward the first lens support 44 side, and is connected to the third elastic support 106. The third flexible substrate 106 is fixed to the first lens support 44, and a position detector composed of a Hall element or the like is provided on the third flexible substrate 106. Through this position detector, the position of the position detection magnet 80 can be detected. In addition, the first coil 56 is connected to the third flexible substrate 106.

[0106] Next, the viscoelastic resin 108 will be described.

[0107] Figure 11 And Figure 12 The first embodiment of the viscoelastic resin 108 is shown.

[0108] The viscoelastic resin 108 is, for example, a resin such as acrylate, epoxy, or silicone-based, and is cured by light, heat, or anaerobic means. The viscoelastic resin 108 is applied during manufacturing and cured by, for example, ultraviolet light. The viscoelastic resin 108 is in a gel state and is very soft, that is, a resin that plays the role of a so-called shock absorber.

[0109] A resin 108 with viscoelasticity is disposed to bridge between the first shield member 48 and the third leaf spring 76. At the center of the front end of the first shield member 48, a protrusion 110 protrudes from the body at the center of the front end toward the left side (-Y side), and a resin disposition surface 112 is formed on the surface at the rear side of the protrusion 110. The resin 108 with viscoelasticity is disposed to bridge between the resin disposition surface 112 and the first coupling portion 96 of the third leaf spring 76. The resin 108 with viscoelasticity further contacts the surface of the body of the first shield member 48 toward the left side, the surface of the first coupling portion 96 of the third leaf spring 76 toward its right side, and the surface toward its front side. The surface of the body of the first shield member 48 toward the left side faces the surface of the first coupling portion 96 of the third leaf spring 76 toward the right side, and the resin disposition surface 112 of the protrusion 110 faces the surface of the first coupling portion 96 of the third leaf spring 76 toward the front side. The first coupling portion 96 of the third leaf spring 76 is slightly lower than the height of the top end of the protrusion 110, and the resin 108 with viscoelasticity contacts it and includes the first coupling portion 96. It may also be slightly lower than the height of the top end of the protrusion 110.

[0110] The resin 108 with viscoelasticity is set as a mover to couple between the first shield member 48 and the third leaf spring 76. Therefore, when moving a heavy mover in the ±Y direction, its vibration can be quickly reduced.

[0111] Figure 13 And Figure 14 A second embodiment regarding the resin 108 with viscoelasticity is shown.

[0112] In this second embodiment, a resin 108 having viscoelasticity is disposed to connect the second shield member 50 and the fourth leaf spring 78. A first protrusion 114 is formed at the center of the front end of the second shield member 50 and protrudes from the main body toward the right side (+Y side). In addition, second protrusions 116 are similarly formed above and below the front end of the second shield member 50 and protrude toward the right side (+Y side). Resin disposition surfaces 112 are formed on the rearward-facing surfaces of the first protrusion 114 and the second protrusions 116. The resin 108 having viscoelasticity is disposed on the first protrusion 114 to connect the resin disposition surface 112 of the first protrusion 114 and the first connection portion 96 of the fourth leaf spring 78. The resin 108 having viscoelasticity further contacts the right-side surface of the main body of the second shield member 50, and contacts the left-side surface and the front-side surface of the first connection portion 96 of the fourth leaf spring 78. The right-side surface of the main body of the second shield member 50 faces the left-side surface of the first connection portion 96 of the fourth leaf spring 78, and the resin disposition surface 112 of the first protrusion 114 faces the front-side surface of the first connection portion 96 of the fourth leaf spring 78. The first connection portion 96 of the fourth leaf spring 78 is slightly lower than the top height of the first protrusion 114, and the resin 108 having viscoelasticity contacts it and includes the first connection portion 96. It may also be slightly lower than the top height of the first protrusion 114.

[0113] In addition, the resin 108 having viscoelasticity is disposed in the second protrusions 116 to connect the resin disposition surfaces 112 of the second protrusions 116 and the first arm portion 86 and the second arm portion 88 of the fourth leaf spring 78. The resin 108 having viscoelasticity further contacts the right-side surface of the main body of the second shield member 50. It contacts the left-side surface and the upper front-side surface of the first arm portion 86 of the fourth leaf spring 78. In addition, it contacts the left-side surface and the lower front-side surface of the second arm portion 88. The right-side surface of the main body of the second shield member 50 faces 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 protrusions 116 faces the upper front-side surface of the first arm portion 86 and the lower front-side 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 top height of the second protrusions 116, and the resin 108 having viscoelasticity contacts them and includes the first arm portion 86 and the second arm portion 88. It may also be slightly lower than the top height of the second protrusions 116.

[0114] In this second embodiment, the resin 108 having viscoelasticity connects the second shield member 50 and the fourth leaf spring 78 at three points, so that the vibration of the mover can be reduced more quickly than in the first embodiment.

[0115] Figure 15 andFigure 16 Shows a third embodiment of the resin 108 having viscoelasticity.

[0116] The resin 108 having viscoelasticity is arranged to connect between the second base 22 and the second lens support 46. The front end face of the second base 22 and the rear end face of the second lens support 46 face each other through a space, and each forms a resin arrangement surface 112. The resin 108 having viscoelasticity is provided between the resin arrangement surface 112 of the second base 22 and the resin arrangement surface 112 of the second lens support 46. Even in this third embodiment, the vibration of the mover in the Y direction can be reduced by the resin 108 having viscoelasticity.

[0117] In this third embodiment, the resin 108 having viscoelasticity is arranged on the right end faces of the second base 22 and the second lens support 46. However, if the second base 22 and the second lens support 46 are opposite faces, it can be arranged at any position, and it is not necessary to be arranged at one position, but can be arranged at multiple positions.

[0118] Figure 17 Shows a fourth embodiment of the resin 108 having viscoelasticity.

[0119] The resin 108 having viscoelasticity is arranged to connect between 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 each forms a resin arrangement surface 112. The resin 108 having viscoelasticity is provided between the resin arrangement end surface 112 of the fourth coil 70 and the resin arrangement surface 112 of the fourth magnet 74. Even in this fourth embodiment, the vibration of the mover in the Y direction can be reduced by the resin 108 having viscoelasticity.

[0120] Similar to the third embodiment, in this fourth embodiment, if the fourth coil 70 (or the third coil 68) and the fourth magnet 74 (or the third magnet 72) are opposite faces, it can be arranged at any position, and it is not necessary to be arranged at one position, but can be arranged at multiple positions.

[0121] In the above embodiments, the resin 108 having viscoelasticity is provided between the second lens support 46 and the third leaf spring 76 or the fourth leaf spring 78 or the stator. However, the present invention is not limited thereto, and it can also be provided between the first lens support 44 and the first leaf spring 64 or the second leaf 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 a lens body; a leaf spring for supporting the mover to freely move relative to the stator in a first direction; characterized in that: the mover has a first surface as a resin arrangement surface, the first surface faces one side of a direction intersecting with the first direction, and the mover further has a second surface, the second surface faces one side of the mover body in the first direction; the first surface is formed on a protruding portion protruding in the first direction on the mover; the leaf spring has a third surface facing the other side of the direction intersecting with the first direction and a fourth surface facing the other side of the first direction, the first surface is opposite to the third surface, and the second surface is opposite to the fourth surface; a viscoelastic resin is disposed on the mover to bridge between the first surface and the third surface and between the second surface and the fourth surface.

2. The lens driving device according to claim 1, characterized in that: the leaf spring has a first fixing portion, a second fixing portion, a first arm portion, a second arm portion, a first connecting portion, and a second connecting portion; the first fixing portion is fixed to the stator on one end side of the leaf spring in a second direction intersecting with the first direction, and the second fixing portion is fixed to the mover on the other end side of the leaf spring in the second direction; the first arm portion is on one end side of the leaf spring in a third direction intersecting with the first direction and the second direction, and elastically connects the first fixing portion and the second fixing portion, the second arm portion is on the other end side of the leaf spring in the third direction, and elastically connects the first fixing portion and the second fixing portion; the first connecting portion is connected to the first arm portion and the second arm portion respectively on the first fixing portion side at a position closer to the first fixing portion than the second fixing portion, and the second connecting portion is connected to the first arm portion and the second arm portion respectively on the second fixing portion side at a position closer to the second fixing portion than the first fixing portion, the third surface and the fourth surface are located at the first connecting portion, and a viscoelastic resin bridges between the first surface and the third surface of the first connecting portion and between the second surface and the fourth surface.

3. The lens driving device according to claim 2, characterized in that: the third surface and the fourth surface are further located at the first arm portion and the second arm portion, a second viscoelastic resin bridges between the first surface and the third surface of the first arm portion and between the second surface and the fourth surface of the first arm portion, and a third viscoelastic resin bridges between the first surface and the third surface of the second arm portion and between the second surface and the fourth surface of the second arm portion.

4. A photographic device, comprising: an optical system for bending light from a subject; a lens body for guiding the bent light therethrough; an imaging element for receiving the light passing through the lens body; It is characterized in that it further includes the lens driving device described in any one of claims 1 to 3.

5. An electronic device, characterized in that, it includes the photographic device described in claim 4.

Images