Lens driving device, camera device and electronic equipment

Abstract

The present invention provides a lens driving device comprising: a stator; a mover, the mover moving toward the stator along the optical axis of the lens, the mover including a lens support for supporting the lens; a protrusion, the protrusion being provided on either the stator or the mover; a recess, the recess being provided on the other of the stator and the mover; wherein the protrusion and the recess respectively have opposing surfaces that are opposite to the protrusion and the recess; and a viscoelastic resin, the viscoelastic resin being configured to contact the opposing surfaces of the protrusion and the recess. Compared to the prior art, the present invention has the following beneficial effects: because the viscoelastic resin is provided on opposing surfaces of the protrusion provided on either the stator or the mover and the recess into which the protrusion is inserted, deviations in the contact conditions between the viscoelastic resin and the protrusion and recess provided on the mover or stator can be reduced. Consequently, deviations in the resonance suppression effect can be reduced.

Description

Technical Field

[0001] The present invention relates to a lens driving device for a camera mounted on electronic devices such as mobile phones and smart phones, and a camera device and electronic equipment using the lens driving device. Background Art

[0002] Generally, electronic devices such as smartphones are equipped with a small camera device, and the camera device is equipped with a lens driving device.

[0003] For a long time, in order to suppress the resonance generated when the lens is focused, a lens drive device designed with a shock-absorbing material has been used (for example, the prior art: Japanese Patent, Tokukai 2016-206531). In the prior art, the gap between the outer peripheral surface of the lens holder and the inner peripheral surface of the four corners of the frame is filled with a shock-absorbing material. A recess is formed at the frame, and the shock-absorbing material is partially accumulated in the recess. Since the shock-absorbing material is accumulated in the recess, it can be prevented from falling off. However, in the prior art, even if the shock-absorbing material can be prevented from falling off, since the shock-absorbing material is only partially accumulated in the recess, it is difficult to control the amount, position, range, etc. of the shock-absorbing material, and the configuration of the shock-absorbing material that is beneficial to controlling the resonance is prone to deviations. As a result, the resonance suppression effect is also prone to deviations. Summary of the Invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a lens driving device, a camera device and an electronic device capable of reducing the deviation of the resonance suppression effect.

[0005] In order to solve the above technical problems, the present invention provides a lens driving device, comprising: a stator; and

[0006] A mover, the mover moves relative to the stator along the optical axis of the lens, the mover comprising a lens support body for supporting the lens,

[0007] The stator has a protrusion,

[0008] The mover has a recess into which the protrusion is inserted.

[0009] The protrusion and the recess respectively have opposing surfaces of the protrusion and the recess facing each other, the mover has a coil fixed to the outer periphery of the lens support body and used to move the mover, the recess is formed by being surrounded by the lens support body and the coil, the lens support body is provided with a notch opened in the optical axis direction of the lens, and the recess is formed between the notch and the coil.

[0010] The resin having viscoelasticity is arranged so as to be in contact with the opposing surfaces of the protrusion and the opposing surfaces of the recess.

[0011] Preferably, the mover has a coil or a magnet for driving the mover, and the recess is surrounded by the lens support body and the coil or the magnet for driving.

[0012] Preferably, a notch is provided on the lens support in the optical axis direction of the lens, and the recess is formed between the notch and the coil or the magnet for driving.

[0013] Preferably, the notch portion has a first surface and a second surface, the first surface is formed in a direction intersecting with the optical axis direction of the lens, the second surface is formed in a direction standing up from the first surface on both sides of the circumferential direction of the first surface and on the inner side toward the optical axis direction of the lens, and the opposite surface of the recess has the inner surface of the coil, the first surface and the second surface.

[0014] Preferably, in the second surface, two surfaces formed in a direction rising from both sides of the first surface in the circumferential direction face the opposing surfaces formed at both ends of the protrusion in the circumferential direction via the resin having viscoelasticity.

[0015] Preferably, the stator includes a housing surrounding the mover, the housing having a box-like shape with an opening at its center, and the protrusion protruding from an edge of the opening into the interior of the box-like shape. Furthermore, the housing has a square cross-section perpendicular to the optical axis of the lens, and the protrusion has two opposing corners.

[0016] Preferably, the protrusion and the recess are provided on both sides of the lens as the center.

[0017] Preferably, the resin having viscoelasticity maintains a state in which the opposing surface of the protrusion and the opposing surface of the recess are in contact even when the mover moves to a maximum position in the optical axis direction of the lens.

[0018] A photographing device includes a lens driving device, a lens supported by a lens supporting body, and a light receiving sensor for detecting light passing through the lens.

[0019] An electronic device includes a camera.

[0020] Compared to the prior art, the present invention has the following advantages: Because viscoelastic resin is applied to the opposing surfaces of the protrusions on either the stator or the mover and the recesses into which they are inserted, variations in the contact conditions between the viscoelastic resin and the protrusions and recesses on the mover or stator can be reduced. Consequently, variations in the resonance suppression effect can be reduced.

[0021] Figures in the specification

[0022] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0023] Figure 1 It is an exploded perspective view of a camera driving device according to an embodiment of the present invention.

[0024] Figure 2 It is a perspective view of a camera driving device according to an embodiment of the present invention.

[0025] Figure 3 The lens driving device according to the embodiment of the present invention is Figure 2 AA line cross-section diagram.

[0026] Figure 4 The lens driving device according to the embodiment of the present invention is Figure 2 BB line cross-section diagram.

[0027] Figure 5 The lens driving device according to the embodiment of the present invention is Figure 2 CC line cross-section diagram.

[0028] Figure 6 This is a perspective view of the lens driving device according to the embodiment of the present invention, showing a state in which the front leaf spring and the rear leaf spring are removed.

[0029] Figure 7 This is a perspective view of a housing used in a lens driving device according to an embodiment of the present invention.

[0030] Figure 8 In the lens driving device according to the embodiment of the present invention, Figure 6 A perspective view of a state where the outer shell is removed and the viscoelastic resin is provided.

[0031] Figure 9 In the lens driving device according to the embodiment of the present invention, Figure 8 A perspective view of a state in which a viscoelastic resin is injected into a concave portion.

[0032] Figure 10 This is a cross-sectional view showing an enlarged view of a resonance suppressing portion in a lens driving device according to an embodiment of the present invention.

[0033] Figure 11 In the lens driving device according to the embodiment of the present invention, Figure 10 Cross-sectional view in the direction orthogonal to the cross section. DETAILED DESCRIPTION

[0034] The present invention is described in detail below using specific examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention, and these all fall within the scope of protection of the present invention.

[0035] One form of the present invention is a lens driving device, which has a stator and a mover that moves toward the stator in the direction of the lens optical axis, the latter including a lens support body for supporting the lens, either the stator or the mover has a protrusion, and the other of the stator and the mover has a recess into which the protrusion is inserted, the protrusion and the recess respectively have opposing surfaces opposite to the protrusion and the recess, and a viscoelastic resin is provided to connect with the opposing surface of the protrusion and the opposing surface of the recess.

[0036] exist Figure 1 and Figure 2 The lens drive device 10 is used in an autofocus compact camera for electronic devices such as mobile phones and smartphones. For convenience, the subject side of the lens drive device 10 in the optical axis direction is referred to as the front side, and the light receiving sensor side that receives light from the subject is referred to as the rear side.

[0037] The lens drive device 10 includes a stator 12 and a mover 14. The stator 12 includes a housing 16 designed to surround the mover 14. The housing 16 includes a box-shaped outer shell 18 disposed at the front and a plate-shaped base 20 disposed at the rear. The outer shell 18 is fixed to the base 20. The housing 16 has a generally square shape when viewed along the optical axis. Openings (22, 24) are formed in the center of the outer shell 18 and the base 20, respectively.

[0038] A washer 26 having a substantially square shape as viewed from the optical axis is fixed to the inner surface of the front portion of the housing 18. Figure 3 As shown, a rectangular parallelepiped magnet 28 for driving is fixed to two opposing inner surfaces of the housing 18 behind the washer 26 .

[0039] The mover 14 is arranged in the housing 16. The mover 14 has a lens support body 30 that supports the lens. The outer side of the lens support body 30 is generally circular when viewed from the optical axis. A lens fixing hole 32 for fixing the lens is formed on the inner side of the lens support body 30. In addition, a coil 34 that is octagonal when viewed from the optical axis of the lens is fixed on the outer periphery of the lens support body 30. The driving magnet 28 faces each other on the coil. In this embodiment, the housing 18 is made of a magnetic body and is located on the back side of the driving magnet 28. It has the function of a yoke shaft, and the magnetic flux from the driving magnet 28 passes through it.

[0040] A wiring board 36 is fixed to one side surface of the base 20. The wiring board 36 has a portion protruding from the housing 16 to the rear side, and a power supply or a control line is connected to the protruding portion.

[0041] like Figure 4 As shown, the lens drive device 10 includes a position detection unit 38 for detecting the position of the mover 14 along the optical axis. The position detection unit 38 is disposed near a corner of the housing 18. The position detection unit 38 is composed of a position detection magnet 40 fixed to the lens support 30 and a position detection sensor 42 fixed to the wiring board 36 opposite the position detection magnet 40. The position detection sensor 42 is composed of a hole element. If the mover 14 moves, the magnetic flux density flowing from the position detection magnet 40 to the position detection sensor 42 changes, thereby detecting the position of the mover 14.

[0042] The mover 14 is elastically supported by a front leaf spring 44 and a rear leaf spring 46, which form a square frame, allowing it to move freely along the optical axis relative to the stator 12. The front leaf spring 44 comprises a stator-side fixing portion 48 fixed to the rear side of the washer 26, a mover-side fixing portion 50 fixed to the front side of the lens support 30, and a bracket portion 52 connecting the stator-side fixing portion 48 and the mover-side fixing portion 50. The bracket portion 52 is capable of elastic deformation along the optical axis of the lens.

[0043] The rear leaf spring 46 is divided into two spring components 54. The rear leaf spring 46, like the front leaf spring 44, is composed of a stator-side fixing portion 56 fixed to the front side of the base 20, a mover-side fixing portion 58 fixed to the rear side of the lens support body 30, and a bracket portion 60 connecting the stator-side fixing portion 56 and the mover-side fixing portion 58. The bracket portion 60 is capable of elastic deformation in the optical axis direction of the lens. In addition, a terminal 62 is designed on the spring component 54 to protrude toward the wiring substrate 36, so that the terminal 62 is connected to the wiring substrate 36. In addition, one side of the mover-side fixing portion 58 of the spring component 54 is connected to one end of the coil 34, and the other side is connected to the other end of the coil 34.

[0044] In the above structure, the lens is supported by the lens support 30. The lens drive device 10, which supports the lens on the lens support 30, is mounted on the camera. In the camera, light entering from the subject through the lens is detected by a light-receiving sensor. A controller mounted on the camera calculates the amount of lens movement to match the focal point of the subject. The controller sends a control signal corresponding to the amount of lens movement to the wiring board 36. Current flows through the wiring board 36 and the rear leaf spring 46 to the coil 34. When current flows into the coil 34, an electromagnetic force in the direction of the optical axis is generated between the drive magnet 28 and the coil 34. This electromagnetic force acts as a driving force for the lens support 30, causing it to move against the front leaf spring 44 or the rear leaf spring 46. In the position detection unit 38, the position of the position detection magnet 40 is detected by the position detection sensor 44, and feedback control is performed to quickly stop the lens support 30 at the target position.

[0045] Therefore, when the lens support body is stopped, resonance occurs in the lens support body 30. Therefore, the resonance of the lens support body 30 needs to be suppressed.

[0046] like Figures 5 to 11 As shown, the lens drive device 10 is designed with two opposing corners of the resonance suppression section 64. That is, the resonance suppression section 64 is located on both sides of the lens. The resonance suppression section 64 is composed of a protrusion 66, a recess 68, and a viscoelastic resin 70.

[0047] To ensure the position of the position detector 37, the resonance suppressing portion 64 is not provided at the corner where the position detector 38 is provided. Furthermore, to maintain balance, the resonance suppressing portion 64 is not provided at the corner opposite to the position detector 38.

[0048] Protrusions 66 are formed integrally with the housing 18 at two opposing corners of the housing 18, projecting rearward from the edge of the opening 22 of the housing 18. These protrusions 66 are formed by stamping during the manufacture of the housing 18. Furthermore, a recess 68 is formed between the lens support 30 and the coil 34. A notch 72 is provided in the lens support 30.

[0049] like Figure 10 as well as Figure 11As shown, the notch 72 is formed by cutting the portion of the lens support body 30 corresponding to the protrusion 66 parallel to the optical axis. Specifically, the notch 72 consists of a first surface 74, which is a bottom surface formed perpendicular to the lens optical axis, and three second surfaces 76, which are three side surfaces extending forward from the first surface 74 and parallel to the lens optical axis. Of the three second surfaces 76, two on either side generally face each other in the circumferential direction, while the remaining one faces radially outward. The recess 68 is the portion surrounded by the first surface 74 of the notch 72, the three second surfaces 76, and the inner surface of the coil 34.

[0050] The protrusion 66 is inserted into the recess 68. Even when the mover 14 moves to the maximum position to the rear side, the protrusion 66 maintains the length of the insertion into the recess 68. The protrusion 66 has an insertion end surface, namely a third surface 78, and four side surfaces, namely a fourth surface 80, which stand up from the third surface 78 toward the front side in parallel with the optical axis direction. The third surface 78 of the protrusion 66 is opposite to the first surface 74 of the notch 72 of the recess 68, and the three second surfaces 76 and the three fourth surfaces 80 constitute opposing surfaces. Furthermore, the outer side of the protrusion 66, namely the fourth surface 80, is opposite to the inner surface of the coil 34, and the fourth surface 80 and the inner surface of the coil 34 constitute opposing surfaces.

[0051] The viscoelastic resin 70 (hereinafter referred to as the resin 70) is composed of a soft gel or a soft adhesive and is hardened by heat or light to have a predetermined viscoelasticity. The resin 70 is disposed between the facing surfaces of the protrusion 66 and the recess 68 and is in contact therewith.

[0052] In this embodiment, resin 70 contacts the aforementioned opposing surfaces, impregnating protrusion 66 and covering the tip of protrusion 66. Specifically, in this embodiment, resin 70 is disposed between first surface 74 of recess 68 and third surface 78 of protrusion 66, between the three second surfaces 76 of notch 72 and the three fourth surfaces 80 of protrusion 66, and between the inner surface of coil 34 and the outer fourth surface 80 of protrusion 66. However, resin 70 need only be disposed between at least one opposing surface. Even when mover 14 is moved to its maximum rearward position, resin 70 maintains contact with the opposing surfaces of protrusion 66 and recess 68.

[0053] Because the resin 70 is disposed between the opposing surfaces of the protrusion 66 and the recess 68, the opposing surfaces are prevented from interfering with each other, causing friction and dust formation. For example, the fourth surfaces 80 on both sides of the protrusion 66 in the circumferential direction can be used as anti-rotation components of the lens support 30. In this case, the second surfaces 76 on both sides of the notch 72 are opposite to and in contact with the fourth surfaces 80 on both sides of the protrusion 66. However, because the resin 70 is located between the two, direct contact between the two is avoided. Even if the two come into contact, the impact is reduced, and even if dust forms, it is difficult to disperse to the outside because it is inside the resin 70.

[0054] While the driving magnet 28 is disposed on the stator 12 side and the coil 34 is disposed on the mover 14 side in the above embodiment, the driving magnet 28 may be disposed on the mover 14 side and the coil 34 on the stator 12 side in the reverse direction. In this case, the recess 68 may be formed by the notch 72 of the mover 14 and the inner surface of the driving magnet 28.

[0055] Furthermore, in the above embodiment, the direction in which the protrusion 66 is inserted into the recess 68 is parallel to the optical axis of the lens. However, the present invention is not limited to this and can be formed in any direction as long as the movement of the mover 14 is ensured. For example, the protrusion 66 can be formed to protrude in a direction perpendicular to the optical axis of the lens, the recess 68 can be formed in a direction perpendicular to the optical axis of the lens support 30, and the protrusion 66 can be inserted into the recess 68 in a direction perpendicular to the optical axis of the lens. Furthermore, in the above embodiment, the protrusion 66 is provided on the stator 12 side and the recess 68 on the mover side, but the reverse can be applied, with the protrusion 66 provided on the mover 14 side and the recess 68 on the stator 12 side. Furthermore, the recess 68 can be formed solely by the lens support 30, without using the coil 34. Furthermore, the resonance suppressor 64 can be provided at each corner, not just at the corners but also at the edges. Furthermore, the housing 18 can function as a yoke shaft, but the housing 18 can be formed of a non-magnetic material.

[0056] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A lens driving device, characterized in that: include: stator; as well as A mover, the mover moves relative to the stator along the optical axis of the lens, the mover comprising a lens support body for supporting the lens, The stator has a protrusion, The mover has a recess into which the protrusion is inserted. The protrusion and the recess respectively have opposing surfaces facing each other. The mover includes a coil fixed to the outer periphery of the lens support and used to move the mover, and the recess is formed by being surrounded by the lens support and the coil. The lens support body is provided with a notch portion opened in the optical axis direction of the lens, and the recess is formed between the notch portion and the coil. The resin having viscoelasticity is arranged to contact the opposing surfaces of the protrusion and the opposing surfaces of the recess. The notch portion includes a first surface and a second surface, the first surface being formed in a direction intersecting the optical axis direction of the lens, the second surface being formed in a direction rising from the first surface on both sides of the circumference direction and the inner side of the first surface toward the optical axis direction of the lens, and the opposing surface of the recess includes the inner surface of the coil, the first surface, and the second surface. The protrusion has a third surface which is an insertion end surface, and four side surfaces which stand forward from the third surface in parallel with the optical axis direction. The third surface is opposite to the first surface, and the third surface and the first surface form an opposite surface. The three second surfaces and the three fourth surfaces are opposite to each other, and the three second surfaces and the three fourth surfaces form an opposite surface. The outer side of the protrusion, i.e., the fourth surface, is opposite to the inner surface of the coil, and the fourth surface and the inner surface of the coil form an opposite surface. The resin having viscoelasticity contacts the opposing surface and soaks the protrusion, so that the tip of the protrusion is covered.

2. The lens driving device according to claim 1, wherein: In the second surface, two surfaces formed in a direction rising from both sides of the first surface in the circumferential direction face the opposing surfaces formed at both ends of the protrusion in the circumferential direction via the resin having viscoelasticity.

3. The lens driving device according to claim 1, wherein: The stator includes a housing surrounding the mover. The housing is a box-shaped body with an opening at the center. The protrusion protrudes from the edge of the opening toward the inside of the box-shaped body.

4. The lens driving device according to claim 3, wherein: The housing has a quadrangular cross-section perpendicular to the optical axis of the lens, and the protrusion has two opposing corners.

5. The lens driving device according to claim 1, wherein: The protrusion and the recess are provided on both sides of the lens.

6. The lens driving device according to claim 1, wherein: The resin having viscoelasticity maintains a state in which the opposing surface of the protrusion and the opposing surface of the recess are in contact even when the mover moves to a maximum position in the optical axis direction of the lens.

7. A photographic device, characterized in that: The lens driving device comprises the lens driving device according to any one of claims 1 to 6, a lens supported by the lens support body, and a light receiving sensor for detecting light passing through the lens.

8. An electronic device, characterized in that: Comprising the photographic device as claimed in claim 7.

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