Lens driving device, camera device, and electronic equipment

Abstract

Provided are a lens drive device, a photographic device, and an electronic device capable of stabilizing and moving a lens body. The lens drive device includes a stator, a mover having a lens support for holding the lens body, and a support device for supporting the mover so that it can move freely in a first direction relative to the stator. A protrusion protruding in a second direction intersecting the first direction is formed on one of the stator and the mover, and a recessed portion for accommodating the protrusion is formed on the other of the stator and the mover. The protrusion and the recessed portion have opposing surfaces facing each other in the second direction, and a viscoelastic resin is disposed to bridge the opposing surfaces.

Description

Technical field

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

[0002] As shown in Patent Document 1, conventional camera devices operate on the principle that light from a subject capable of bending light is passed through a lens, such as a prism, and incident on an imaging element. The camera device includes a lens drive mechanism that moves a mover, which has a lens support member for holding the lens, relative to a stator.

[0003]

Prior art literature

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-010295 [Summary of the invention]

[0006] [Technical Problems to be Solved by the Present Invention]

[0007] In particular, as described above, in a camera device that bends light, the lens body is heavier and has a longer travel distance than a lens body in a camera device that does not bend light. Therefore, there is a problem that a stable lens body is difficult to move.

[0008] 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.

[0009]

Technical solution

[0010] 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, and a supporting device for supporting the mover so that it can move freely in a first direction relative to the stator. A protrusion protruding in a second direction intersecting with the first direction is formed on one side of the stator and the mover, and a recess for accommodating the protrusion is formed on the other side of the stator and the mover. The protrusion and the recess have opposite surfaces facing each other in the second direction, and a viscoelastic resin is arranged to bridge the opposite surfaces.

[0011] Preferably, the protrusion and the recess have an overlapping portion on at least one side in the first direction. The protrusion and the recess serve as stoppers that regulate the movement of the mover in the first direction. If the stopper has an overlapping portion between the protrusion and the recess only on one side, the movement of the mover is regulated only on one side; if the stopper has overlapping portions between the protrusion and the recess on both sides, the movement of the mover is regulated on both sides.

[0012] Furthermore, preferably, at least one opposing surface of the protrusion and the recess is formed of a plane perpendicular to the second direction.

[0013] Furthermore, it is preferable that at least one surface of the recessed portion other than the opposing surface is in an open state.

[0014] Another embodiment of the present invention is a photographic device comprising an optical system for bending light from a subject, the lens body for guiding the bent light to pass therethrough, a receptor imaging element for receiving the light passing through the lens body, and any one of the above-mentioned lens driving devices.

[0015] Another embodiment of the present invention is an electronic device equipped with the above-mentioned camera device.

[0016] Beneficial effects

[0017] According to the present invention, since the resin having viscoelasticity is provided between the protrusions and the recesses formed on the stator and the mover, the lens can be stabilized and moved.

Brief Description of the Drawings

[0018]

Figure 1

[0019]

Figure 2

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Figure 3

[0021]

Figure 4

[0022]

Figure 5

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Figure 6

[0024]

Figure 7

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Figure 8

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Figure 9

[0027]

Figure 10

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Figure 11

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Figure 12

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Figure 13

[0031]

Figure 14

[0032]

Number Description

[0033] 10. Camera

[0034] 12 Frame

[0035] 14 Main body part

[0036] 16 Upper cover

[0037] 18 Lower cover

[0038] 20 First Abutment

[0039] 22 Second abutment

[0040] 24 Light entrance window

[0041] 26 Prism Assembly

[0042] 28 lens assembly

[0043] 30 Prism

[0044] 32 Prism support

[0045] 42 lens

[0046] 44 first lens support body

[0047] 46 second lens support body

[0048] 48 first shield component

[0049] 50 Second shield component

[0050] 52 First lens driving device

[0051] 54 Second lens driving device

[0052] 56 First coil

[0053] 58 Second coil

[0054] 60 First Magnet

[0055] 62 Second Magnet

[0056] 64 First leaf spring

[0057] 66 Second leaf spring

[0058] 68 Third coil

[0059] 70 Fourth coil

[0060] 72 The Third Magnet

[0061] 74 The Fourth Magnet

[0062] 76 Third leaf spring

[0063] 78 Fourth leaf spring

[0064] 80 Position detection magnet

[0065] 82 First fixed part

[0066] 84 Second fixed part

[0067] 86 First Arm

[0068] 88 Second Arm

[0069] 90 annular portion

[0070] 96 First joint

[0071] 98 Second connection

[0072] 100 First Flexible Substrate

[0073] 102 second flexible substrate

[0074] 104 substrate support portion

[0075] 106 third flexible substrate

[0076] 108 Viscoelastic resin

[0077] 110 stopper

[0078] 112 protrusion

[0079] 114 recess

[0080] 116 Opposite Side [Specific implementation method]

[0081] Embodiments of the present invention will be described with reference to the drawings.

[0082] exist Figures 1 to 7 , a camera apparatus 10 according to an embodiment of the present invention is shown.

[0083] The camera device 10 includes a housing 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 open. The upper cover 16 covers the upper portion of the main body 14, excluding the light incident window 24. The lower cover 18 covers the lower portion of the main body 14. Thus, the first base 20 and the second base 22 are provided at the front and rear ends of the main body 14 in the X-axis direction. An imaging element (not shown) can be mounted via the second base 22.

[0084] In this specification, the optical axis of the lens 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 both the X-axis and the Y-axis is referred to as the Z-axis direction. Furthermore, one side of the X-axis direction is referred to as the front (-X direction), the other side is referred to as the rear (+X direction), one side of the Y-axis direction is referred to as the left, the other side is referred to as the right, and one side of the Z-axis direction is referred to as the top, while the other side is referred to as the bottom. Light from the subject is incident from the top side of the Z-axis direction and is focused on the imaging element positioned to the rear side of the X-axis direction.

[0085] 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 housing 12, and the lens assembly 28 is accommodated in the rear side of the housing 12.

[0086] The prism assembly 26 includes a prism 30 positioned below the light incident window 24. This prism 30 forms an optical component of the optical system that forms a curved optical axis and has a triangular cross-section. One side of the prism 30 faces the light incident window 24, while the other side faces the lens assembly 28. The surface between the two faces forms a reflective surface at a 45-degree angle. The prism 30 is fixed to a prism support 32. Both the prism 30 and the prism support 32 are freely rotatable along the Y-axis.

[0087] Light from the subject entering in the Z-axis direction through the light incident window 24 is transmitted to the lens assembly 28, which is bent 90 degrees in the X-axis direction, by the prism 30. As a result, the prism 30 and the prism support 32 are rotated to shift the light emitted from the prism 30 in the Z-axis direction, thereby adjusting the position of the light incident on the imaging element in the Z-axis direction.

[0088] In the photographic device 10, the lens assembly 28 includes a lens body 42 that focuses light emitted from the prism 30 onto the imaging 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, surrounding the first lens support body 44 in front, back, left, and right directions. A first protective cover component 48 and a second protective cover component 50 are fixed to the left and right sides 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.

[0089] In the first lens driving device 52, a first coil 56 and a second coil 58 are fixed to the left and right sides of the first lens support 44. Furthermore, a first magnet 60 and a second magnet 62 are fixed to the left and right sides of the second lens support 46, opposite the first coil 56 and the second coil 58. A first leaf spring 64 and a second leaf spring 66, serving as support means, are connected to the first lens support 44 and the second lens support 46 in front and behind the first lens support 44. This supports the first lens support 44 and enables it to move forward and backward relative to the second lens support 46.

[0090] Furthermore, in the second lens driving device 54, a third coil 68 and a fourth coil 70 are fixed to 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, a third magnet 72 and a fourth magnet 74 are fixed to the left and right sides of the second lens support 46. A third leaf spring 76 and a fourth leaf spring 78, serving 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.

[0091] When the first coil 56 and the second coil 58 are energized, a Lorentz force is generated in the X-axis direction. The first lens support 44 moves in the X-axis direction relative to the second lens support 46 against the first leaf spring 64 and the second leaf spring 66. The movement of the first lens support 44 in the X-axis direction adjusts the focus of the light-receiving imaging element of the light passing through the lens 42.

[0092] 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 .

[0093] Furthermore, when power is supplied to the third coil 68 and the fourth coil 70, they generate a Lorentz force in the Y-axis direction. The third magnet 72 and the fourth magnet 74 generate a reaction force. When the third magnet 72 and the fourth magnet 74 generate a force in the Y-axis direction, the second lens support 46 counteracts the third leaf spring 76 and the fourth leaf spring 78, causing it to move in the Y-axis direction relative to the frame 12. In this case, if the second lens support 46 supporting the first lens support 44 moves in the Y-axis direction, the light emitted from the lens body 42 shifts in the Y-axis direction, allowing the position of the light incident on the imaging element in the Y-axis direction to be adjusted.

[0094] That is, the image stabilization is corrected 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 .

[0095] 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.

[0096] 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.

[0097] 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 have a curved 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.

[0098] The first coupling portion 96 is coupled to the first arm 86 and the second arm 88 at a portion closer to the first fixing portion 82 than the second fixing portion 84, and at a portion where the distance between the first arm 86 and the second arm 88 is closest. Similarly, the second coupling portion 98 is coupled to the first arm 86 and the second arm 88 at a portion closer to the second fixing portion 84 than the first fixing portion 82, and at a portion where the distance between the first arm 86 and the second arm 88 is closest. The first arm 86 and the second arm 88 are reinforced by being coupled by the first coupling portion 96 and the second coupling portion 98. By adopting this shape of the third leaf spring 76, the entire structure is fixed at one end, preventing the first arm 86 and the second arm 88 from excessively deforming, thereby enabling the second lens support 46 to move over a long stroke.

[0099] The first arm portion 86 , the second arm portion 88 , the first coupling portion 96 , and the second coupling portion 98 are formed into a substantially circular shape, constituting the annular portion 90 .

[0100] Refer to the following Figure 9 as well as Figure 10 Describe the electrical system.

[0101] 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 bends and extends rearward, crossing the annular portion 90 of the third leaf spring 76. The portion extending rearward from the first flexible substrate 100 further bends and extends forward, crossing the rear portion of the first shield member 48. The forward-extending portion 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 a substrate support portion 104 fixed to the second lens support member 46. The other end of the second flexible substrate 102 extends over the lower end of the substrate support member 104 toward the first lens support member 44, connecting to the third elastic support member 106. The third flexible substrate 106 is fixed to the first lens support member 44. A position detector, such as a Hall element, is provided on the third flexible substrate 106. This position detector detects the position of the position detection magnet 80. Furthermore, the first coil 56 is connected to the third flexible substrate 106.

[0102] Next, the resin 108 having viscoelasticity will be described.

[0103] Figure 11 as well as Figure 12 A first embodiment of the resin 108 having viscoelasticity is shown.

[0104] 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, for example, by ultraviolet light. The viscoelastic resin 108 is gel-like and very soft, acting as a so-called shock absorber.

[0105] A viscoelastic resin 108 is provided on a stopper portion 110. This stopper portion 110 is composed of a protrusion 112 that protrudes rightward (in the +Y direction) from the right side surface of the first lens support 44, and a recess 114 that is recessed into the right inner surface of the second lens support 46. The protrusion 112 and the recess 114 form opposing surfaces 116, 116 that face each other in the left-right direction (in the ±Y direction), with the viscoelastic resin 108 disposed between the opposing surfaces 116, 116. The opposing surfaces 116, 116 form a flat surface. Furthermore, on the stopper portion 110, the left side surface and the upper and lower surfaces of the recess 114 are open.

[0106] Furthermore, the protrusion 112 of the stopper portion 110 overlaps with the recess 114 in the front-to-back direction (±X direction), that is, the protrusion 112 enters the depth range of the recess 114. Therefore, in this first embodiment, when the first lens support member 44 (here, constituted by a mover) moves relative to the second lens support member 46 (here, constituted by a stator) in the ±X directions, the protrusion 112 contacts the recess 114 on both sides in the X direction, thereby regulating the movement of the first lens support member 44.

[0107] Furthermore, the viscoelastic resin 108 is provided to connect the facing surfaces 116, 116 of the protrusion 112 and the recess 114, so that when the heavy mover is moved in the ±X directions, its vibration can be quickly reduced.

[0108] Figure 13 as well as Figure 14 A second embodiment of the resin 108 having viscoelasticity is shown.

[0109] In the second embodiment, there is also an example in which a viscoelastic resin 108 is provided outside the stopper portion 110. In the second embodiment, the viscoelastic resin 108 is provided to connect the protrusion 112 holding the second flexible substrate 102 and the recess 114 accommodating the protrusion 112.

[0110] The protrusion 112 protrudes from the left inner surface of the second lens support 46 toward the right (+Y side). The second flexible substrate 102 extends upward along the protrusion 112 and is connected to the third flexible substrate 106.

[0111] The recess 114 is recessed from the left side of the first lens support 44 toward the right side (+Y side). Furthermore, the protrusion 112 and the recess 114 form opposing surfaces 116, 116 facing each other in the left-right direction (±Y direction). A viscoelastic resin 108 is disposed between the opposing surfaces 116, 116. The opposing surfaces 116, 116 form a flat surface. The left side and upper and lower surfaces of the recess 114 are open. Furthermore, in the front-back direction (±X direction), the protrusion 112 and the recess 114 overlap.

[0112] In the second embodiment, as in the first embodiment, a viscoelastic resin 108 is provided to connect the opposing surfaces 116, 116 of the protrusion 112 and the recess 114, so that when the heavy mover is moved in the ±X directions, its vibration can be quickly reduced.

[0113] While the viscoelastic resin 108 is disposed between the first lens support 46 and the second lens support in the above embodiment, the present invention is not limited thereto. The second lens support may serve as a mover, or may be disposed between the mover and the stator. Furthermore, the protrusion 112 may simply protrude in a direction intersecting the direction of movement of the mover.

Claims

1. A lens driving device, comprising: stator; A mover having a lens support body for holding the lens body, wherein light entering from above in the vertical direction and bending 90 degrees is transmitted toward the lens body side; a supporting device for supporting the mover so that the mover can move freely relative to the stator in a first direction perpendicular to the up-down direction; It is characterized by: A protrusion protruding in a second direction perpendicular to the up-down direction and the first direction is formed on one of the stator and the mover, and a recessed portion recessed in the second direction and accommodating the protrusion is formed on the other of the stator and the mover; The protrusion and the recess have opposing surfaces facing each other in the second direction; A viscoelastic resin is provided to bridge the opposing surfaces; The protrusion and the recess have overlapping portions on both sides of the first direction; The opposing surfaces of at least one side of the protrusion and the recess are formed by a plane orthogonal to the second direction; The surface opposite to the opposing surface and the upper and lower surfaces of the recessed portion are in an open state.

2. The lens driving device according to claim 1, wherein: The protrusion and the recess constitute a stopper portion that regulates movement of the mover relative to the stator in the first direction.

3. A photographic device comprising: 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; It is characterized by also including The lens driving device according to any one of claims 1 to 2.

4. An electronic device, characterized in that: A camera device comprising the camera device according to claim 3.

Images