Lens driving device, camera device and electronic equipment

Abstract

Provided are a lens driving device, a photographing device, and an electronic device capable of stabilizing and moving a lens body. The lens driving device is characterized by comprising: a stator, a mover having a lens support body for holding the lens body, a support device for supporting the mover so that it can move freely in a first direction relative to the stator, and a flexible substrate connecting the stator and the mover, wherein the flexible substrate has opposing surfaces facing each other in a direction orthogonal to the first direction, and a resin having viscoelasticity is arranged to bridge the opposing surfaces.

Description

Technical Field

[0001] The invention relates to a lens driving device, a photographing device and an electronic device. Background Art

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

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-010295 Summary of the invention

[0004] [Technical Problems to be Solved by the Invention]

[0005] In particular, as described above, in a camera device having a structure that bends light, the lens body is heavy and has a large moving distance, compared to a lens body in a camera device having a structure that does not bend light. Therefore, there is a problem that a stable lens body is difficult to move.

[0006] The present invention aims to solve the above-mentioned conventional problems and provide a lens driving device, a photographing device and an electronic device capable of stabilizing and moving a lens body.

[0007] One embodiment of the present invention is a lens driving device, which has a stator, a mover having a lens support body for holding a lens body, a supporting device for supporting the mover so that it can move freely in a first direction relative to the stator, and a flexible substrate connecting the stator and the mover, the flexible substrate having a curved portion and opposing surfaces facing each other that are curved in a direction intersecting the first direction, the curved portion connecting the opposing surfaces facing each other; and a viscoelastic resin is configured to bridge the opposing surfaces facing each other.

[0008] Preferably, the resin having viscoelasticity is disposed on the bent portion of the flexible substrate.

[0009] Furthermore, the support means is a leaf spring having an annular portion, the flexible substrate straddles the annular portion via the curved portion, and the mover has a shield member covering the lens support body, the flexible substrate straddles the shield member via the curved portion.

[0010] The resin having viscoelasticity may be disposed not only between the opposing surfaces of the flexible substrate but also between the flexible substrate and the stator or mover opposing the flexible substrate.

[0011] Another embodiment of the present invention is a photographic device comprising an optical system that bends light from a subject, the lens body that guides the bent light to pass therethrough, an imaging element that receives the light that has passed through the lens body, and the lens driving device according to claim 1.

[0012] Another embodiment of the present invention is an electronic device equipped with the camera device.

[0013]

Beneficial Effects

[0014] According to the present invention, along one direction in which the mover moves, since the resin having viscoelasticity is provided via the flexible substrate, the lens body can be stabilized and moved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015]

Figure 1

[0016]

Figure 2

[0017]

Figure 3

[0018]

Figure 4

[0019]

Figure 5

[0020]

Figure 6

[0021]

Figure 7

[0022]

Figure 8

[0023]

Fig. 9

[0024]

Fig.10

[0025]

Fig.11

[0026]

Fig.12

[0027]

Number Description

[0028] 10. Camera

[0029] 12 Frame

[0030] 14 Main body part

[0031] 16 Upper cover

[0032] 18 Lower cover

[0033] 20 First abutment

[0034] 22 Second abutment

[0035] 24 Light entrance window

[0036] 26 Prism Assembly

[0037] 28 Lens assembly

[0038] 30 Prism

[0039] 32 Prism support

[0040] 42 Lens

[0041] 44 first lens support body

[0042] 46 second lens support body

[0043] 48 first shield component

[0044] 50 Second shield component

[0045] 52. First lens driving device

[0046] 54 Second lens driving device

[0047] 56 First coil

[0048] 58 Second coil

[0049] 60 First Magnet

[0050] 62 Second Magnet

[0051] 64 First leaf spring

[0052] 66 Second leaf spring

[0053] 68 Third coil

[0054] 70 Fourth coil

[0055] 72 The Third Magnet

[0056] 74 The Fourth Magnet

[0057] 76 Third leaf spring

[0058] 78 Fourth leaf spring

[0059] 80 Position detection magnet

[0060] 82 First fixed part

[0061] 84 Second fixed part

[0062] 86 First arm

[0063] 88 Second arm

[0064] 90 Ring

[0065] 96 First joint

[0066] 98 Second connection

[0067] 100 The first flexible substrate

[0068] 102 second flexible substrate

[0069] 104 substrate support part

[0070] 106 third flexible substrate

[0071] 108 Viscoelastic resin

[0072] 110 Opposite side

[0073] 112 Bend DETAILED DESCRIPTION

[0074] Embodiments of the present invention will be described with reference to the drawings.

[0075] exist Figures 1 to 7 , a camera device 10 according to an embodiment of the present invention is shown.

[0076] The camera device 10 has a frame 12. The frame 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 parts of the main body 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 14 except for the light incident window 24. And the lower cover 18 covers the lower part of the main body 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. Through the second base 22, an imaging element (not shown) can be mounted.

[0077] In this specification, the optical axis direction of the lens body 42 described later is referred to as the X-axis direction, the direction perpendicular to the X-axis direction is referred to as the Y-axis direction, and the direction perpendicular to the X-axis and the Y-axis is referred to as the Z-axis direction. One side of the X-axis direction is referred to as the front (-X direction), the other side is referred to as the back (+X direction), one side of the Y-axis is referred to as the left, the other side is referred to as the right, one side of the Z-axis is referred to as the top, and the other side is referred to as the bottom. Light from the subject is incident from the upper side of the Z-axis direction and is focused on the imaging element provided on the back side of the X-axis direction.

[0078] The camera device 10 includes a prism assembly 26 and a lens assembly 28. The prism assembly 26 is accommodated in the front side of the frame 12, and the lens assembly 28 is accommodated in the rear side of the frame 12.

[0079] The prism assembly 26 has a prism 30 disposed below the light incident window 24. The prism 30 constitutes an optical component of an optical system that forms a curved optical axis, and has a triangular cross-section. One surface of the prism 30 faces the light incident 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 on a prism support 32. The prism 30 and the prism support 32 can freely rotate around along the Y-axis direction.

[0080] The light from the subject entering from the Z-axis direction through the light incident window 24 is transmitted to the lens assembly 28 side bent at 90 degrees in the X-axis direction through the prism 30. Thus, the prism 30 and the prism support 32 are rotated to shift the light emitted from the prism 30 in the Z-axis direction, and the position of the light incident on the imaging element in the Z-axis direction is adjusted.

[0081] In the photographic device 10, the lens assembly 28 has a lens body 42 that focuses the light emitted from the prism 30 on the image pickup element. The lens body 42 is fixed to a first lens support body 44. A second lens support body 46 is provided around the first lens support body 44 to surround the first lens support body 44 in front, back, left, and right. A first protective cover component 48 and a second protective cover component 50 are fixed to the left and right of the second lens support body 46. The first lens support body 44 and the second lens support body 46 constitute a first lens driving device 52. In addition, the second lens support body 46 and the main body 14 of the frame body 12 constitute a second lens driving device 54.

[0082] 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, the first magnet 60 and the second magnet 62 are fixed to the left and right sides of the second lens support 46 opposite to the first coil 56 and the second coil 58. The first leaf spring 64 and the second leaf spring 66 as supporting means are connected to the first lens support 44 and the second lens support 46 in front and behind the first lens support 44. Thus, the first lens support 44 is supported and can move forward and backward relative to the second lens support 46.

[0083] Furthermore, in the second lens driving device 54, the third coil 68 and the fourth coil 70 are fixed on the left and right sides of the second base 22 of the frame 12. Furthermore, opposite to the third coil 68 and the fourth coil 70, the third magnet 72 and the fourth magnet 74 are fixed on the left and right sides of the second lens support 46. The third leaf spring 76 and the fourth leaf spring 78 as supporting means are connected to the second lens support 46 and the frame 12 on the left and right sides of the second lens support 46. Thus, the second lens support 46 is supported and can move left and right relative to the frame.

[0084] 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 opposes 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 of the light passing through the lens body 42 can be adjusted.

[0085] A position detection magnet 80 is provided on the left side surface of the second lens support body 46 , and the position of the first lens support body 44 in the X-axis direction is detected by the position detection magnet 80 .

[0086] 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 their reaction force. If the third magnet 72 and the fourth magnet 74 generate a force in the Y-axis direction, the second lens support body 46 opposes the third leaf spring 76 and the fourth leaf spring 78 and moves in the Y-axis direction relative to the frame body 12. In this case, if the second lens support body 46 supporting the first lens support body 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.

[0087] 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 .

[0088] In this case, in the second lens driving device 54, the frame 12 is a stator and the second lens support 46 is a mover. In the first lens driving device 52, the second lens support 46 is a stator and the first lens support 44 is a mover.

[0089] 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.

[0090] The third leaf spring 76 is formed at the end in the front-to-back direction so that the first fixing portion 82 and the second fixing portion 84 extend in the Z-axis direction. The first fixing portion 82 is fixed to the prism support body 32 which is a stator. The second fixing portion 84 is fixed to the second lens support body 46 which is a 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 arranged on the upper end side, and the second arm portion 88 is arranged on the lower end side. The first arm portion 86 and the second arm portion 88 are curved in shape, so that the stroke of elastic deformation can be lengthened compared to being connected to the first fixing portion 82 and the second fixing portion 84 in a straight line.

[0091] The first coupling portion 96 is coupled to the first arm portion 86 and the second arm portion 88 at a portion which is closer to the first fixing portion 82 than the second fixing portion 84 and at which the distance between the first arm portion 86 and the second arm portion 88 is closest. The second coupling portion 98 is similarly coupled to the first arm portion 86 and the second arm portion 88 at a portion which is closer to the second fixing portion 84 than the first fixing portion 82 and at which the distance between the first arm portion 86 and the second arm portion 88 is closest. The first arm portion 86 and the second arm portion 88 are coupled to each other by the first coupling portion 96 and the second coupling portion 98, thereby being reinforced. By adopting the third leaf spring 76 of this shape, a shape in which one end is fixed as a whole is formed, and the first arm portion 86 and the second arm portion 88 are not excessively deformed, so that the second lens support body 46 can be moved with a long stroke.

[0092] The first arm portion 86 , the second arm portion 88 , the first coupling portion 96 , and the second coupling portion 98 form a substantially circular shape, and constitute the annular portion 90 .

[0093] Refer to the following Fig. 9 as well as Fig.10 Describe the electrical system.

[0094] One end of the first flexible substrate 100 is fixed to the left side of the second base 22, and the other end extends forward. The front of the first flexible substrate 100 is bent, extended backward, and straddles the annular portion 90 of the third leaf spring 76. The portion extending backward of the first flexible substrate 100 is bent, extended forward, and straddles the rear portion of the first shield member 48. The portion extending forward of the first flexible substrate 100 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 body 46. The other end of the second flexible substrate 102 straddles the lower end of the substrate support body 104, extends to the first lens support body 44 side, and is connected to the third elastic support body 106. The third flexible substrate 106 is fixed to the first lens support body 44, and a position detector composed of a Hall element or the like is provided on the third flexible substrate 106. The position detector can detect the position of the position detection magnet 80. In addition, the first coil 56 is connected to the third flexible substrate 106.

[0095] Next, the resin 108 having viscoelasticity will be described.

[0096] Fig.11 A first embodiment of the resin 108 having viscoelasticity is shown.

[0097] The viscoelastic resin 108 is, for example, an acrylate, epoxy, or silicone resin, and is hardened by light, heat, or anaerobic conditions. The viscoelastic resin 108 is applied during manufacturing and hardened by, for example, ultraviolet light. The viscoelastic resin 108 is in a gel-like state and is very soft, that is, it functions as a so-called shock absorber.

[0098] The viscoelastic resin 108 is disposed to connect the opposing surfaces 110 , 110 of the first flexible substrate 100 at the front curved portion of the first flexible substrate 100 . The viscoelastic resin 108 is also disposed in the curved portion 112 of the first flexible substrate 100 .

[0099] Since the viscoelastic resin 108 is disposed between the opposing surfaces 110 , 110 of the first flexible substrate 100 , the elasticity of the first flexible substrate 100 is also enhanced, and when the heavy mover is moved in the ±Y directions, its vibration can be quickly reduced.

[0100] Fig.12 A second embodiment of the resin 108 having viscoelasticity is shown.

[0101] In the second embodiment, the resin 108 having viscoelasticity is disposed to couple the opposing surfaces 110, 110 of the first flexible substrate 100 that face each other at the bent portion in front of the first flexible substrate 100. In the second embodiment, the resin 108 having viscoelasticity is not disposed in the bent portion of the first flexible substrate 100, but may be disposed in the bent portion 112.

[0102] In the above embodiment, the resin 108 having viscoelasticity is disposed between the opposing surfaces 110 , 110 of the first flexible substrate 108 , but the present invention is not limited thereto, and the resin 108 may also be disposed between the flexible substrate and the stator or the mover.

Claims

1. A lens driving device, wherein the optical axis direction of the lens body is taken as the X-axis direction, and a direction orthogonal to the X-axis direction is taken as the Y-axis direction; characterized in that: include: A first lens support body for fixing the lens body; a second lens support body disposed so as to surround the first lens support body; A frame supporting the second lens support body; A supporting device for supporting the first lens support body so that it can move freely in the X-axis direction relative to the second lens support body, and supporting the second lens support body so that it can move freely in the Y-axis direction relative to the frame; A flexible substrate disposed separately from the supporting device, the flexible substrate comprising a first flexible substrate, a second flexible substrate and a third flexible substrate; One end of the first flexible substrate is fixed to the frame, and the other end is connected to the second flexible substrate; one end of the second flexible substrate is fixed to the second lens support body, and the other end is connected to the third flexible substrate; the third flexible substrate is fixed to the first lens support body; The first flexible substrate extends forward in the X-axis direction from one end fixed to the frame, is bent at a bent portion and extends backward in the X-axis direction, and then is bent at another bent portion from a portion extending backward in the X-axis direction and extends forward in the X-axis direction to the second flexible substrate; The first flexible substrate has a bent portion in front of the X-axis direction and two opposite surfaces extending in the X-axis direction and facing each other in the Y-axis direction, and has another bent portion in the rear of the X-axis direction and two other opposite surfaces extending in the X-axis direction and facing each other in the Y-axis direction, and each of the bent portions connects the two opposite surfaces facing each other; A resin having viscoelasticity is disposed on the curved portion in front of the X-axis or the curved portion in the rear, so as to bridge the two opposing surfaces facing each other.

2. The lens driving device according to claim 1, characterized in that: The supporting device is a leaf spring having an annular portion, and the first flexible substrate straddles the annular portion via the curved portion at the front.

3. The lens driving device according to claim 1 or 2, characterized in that: The second lens support body has a cover member covering the second lens support body, and the first flexible substrate straddles the cover member via the rear curved portion.

4. A photographic device, characterized in that: include: An optical system that bends light from a subject; a lens body for guiding the bent light to pass through; an imaging element for receiving the light passing through the lens body; It is characterized in that It also includes a lens driving device as claimed in any one of claims 1 to 3.

5. An electronic device, characterized in that: A photographic device comprising the photographic device described in claim 4.

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