Lens driving device, camera device and electronic equipment

Abstract

Provided are a lens driving device, a photographic device, and an electronic device in which the positions of resins can be kept balanced. In the lens driving device (10), an intermediate support body (16) supports the lens support body (14) to move freely, a base body (18) supports the intermediate support body (16) to move freely, a first resin (66) is arranged between the lens support body (14) and the intermediate support body (16), has viscoelasticity, and is arranged at least at two locations with rotational symmetry around the optical axis of the lens, and a second resin (68) is arranged between the intermediate support body (16) and the base body (18), has viscoelasticity, and is arranged at least at two locations with rotational symmetry around the optical axis of the lens. The first resin (66) is approximately at the same position as the second resin (68) in the circumferential direction as viewed from the optical axis direction of the lens, or in the middle of two adjacent second resins, and the first resin (66) and the second resin (68) are arranged at at least four positions in the circumferential direction as viewed from the optical axis direction of the lens.

Description

[Technical field]

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

[0002] Electronic devices such as mobile phones and smartphones are equipped with small cameras. These small cameras perform automatic focusing and shake compensation by driving the lens support body in the direction of the optical axis of the lens and in a direction perpendicular to the optical axis.

[0003] In order to suppress the resonance of the lens support body, a resin having viscoelasticity is provided. As is well known, conventionally, a resin is provided at the center of the side of a quadrangular lens driving device.

[0004] [Prior art literature]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2013-50668 [Summary of the invention]

[0007] [Technical Problems to be Solved by the Invention]

[0008] However, conventionally, the resin for autofocus and shake compensation is provided at the center of two opposing sides, so the balance of the position where the resin is provided is poor.

[0009] The present invention aims to solve the above-mentioned problems and provide a lens driving device, a camera device and an electronic device in which the resin position can be kept balanced.

[0010]

Methods to solve the problem

[0011] One aspect of the present invention is a lens driving device, the lens driving device having

[0012] a lens support body for supporting the lens,

[0013] an intermediate support body for supporting the lens support body to move freely,

[0014] A base body supporting the free movement of the intermediate support body,

[0015] a first resin having viscoelasticity and disposed between the lens support and the intermediate support at least at two locations so as to be rotationally symmetrical about the optical axis of the lens;

[0016] A second resin having viscoelasticity is provided between the intermediate support body and the base body and is arranged at at least two locations so as to be rotationally symmetrical about the optical axis of the lens.

[0017] The first resin is positioned at substantially the same position as the second resin in the circumferential direction or in the middle of two adjacent second resins when viewed in the optical axis direction of the lens, and the first resin and the second resin are arranged at at least four positions in the circumferential direction when viewed in the optical axis direction of the lens.

[0018] Preferably, the lens support body is supported by a first elastic part, and is free to move relative to the intermediate support body, and the first resin is arranged on the first elastic part. Moreover, preferably, the intermediate support body and the lens support body are quadrilaterals viewed from the optical axis direction of the lens, and the corners of the intermediate support body and the lens support body correspond to each other, the first elastic part has an elastic arm part, connecting a corner of the intermediate support body and a corner of the lens support body adjacent to the corner, and the first resin bridges the curved parts of the elastic arm parts facing each other in the middle.

[0019] Preferably, the intermediate support body and the lens support body are quadrilateral when viewed from the optical axis direction of the lens, and the corners of the intermediate support body and the lens support body correspond to each other, and the first resin bridges the outer surface of the lens support body parallel to the optical axis direction of the lens and the inner surface of the intermediate support body parallel to the outer surface at the corners of the quadrilateral.

[0020] Preferably, the intermediate support body and the base body are supported by a second elastic part so as to be freely movable, and the second resin is arranged near the second elastic part to suppress vibration transmitted from the second elastic part. Furthermore, the second elastic part is arranged at four corners of the quadrangular base body, and the second resin bridges between the lower side of the intermediate support body and the upper side of the base body.

[0021] Preferably, the lens support body, the intermediate support body and the base body are in a quadrangular shape when viewed from the optical axis direction of the lens, and the first resin and the second resin may also be arranged at the corners or sides of the quadrangular shape. Preferably, one of the first resin and the second resin is arranged at the corner of the quadrangular shape, and the other is arranged at the side of the quadrangular shape.

[0022] Preferably, the lens support body, the intermediate support body and the base body are in a quadrangular shape when viewed from the optical axis direction of the lens, and the first resin and the second resin are arranged on respective sides of the quadrangular shape.

[0023] Furthermore, it is preferable that the first resin and the second resin are arranged to be staggered in the optical axis direction of the lens.

[0024] Another aspect of the present invention is a camera device including the lens driving device, a lens supported by the lens support body, and a light receiving sensor for receiving light from the lens.

[0025] Another aspect of the present invention is an electronic device equipped with the camera device.

[0026] [Effects of the invention]

[0027] According to the present invention, a viscoelastic first resin and a second resin are configured to be rotationally symmetrical with the optical axis of the lens as the center. Moreover, the first resin is substantially at the same position as the second resin in the circumferential direction or in the middle of the adjacent second resin when viewed from the optical axis of the lens, and the first resin and the second resin are configured at at least four positions in the circumferential direction when viewed from the optical axis of the lens. Therefore, the positions of the first resin and the second resin can be balanced.

Brief Description of the Drawings

[0028]

Figure 1

[0029]

Figure 2

[0030]

Figure 3

[0031]

Figure 4

[0032]

Figure 5

[0033]

Figure 6

[0034]

Figure 7

[0035]

Explanation of symbols

[0036] 10 Lens drive device

[0037] 12 Lens

[0038] 14 Lens support

[0039] 16 Intermediate support

[0040] 18 Basic Body

[0041] 20 Shielding box

[0042] 22 Entrance hole

[0043] 24 Lens support hole

[0044] 26 Autofocus coil (AF coil)

[0045] 28 magnet

[0046] 30 first elastic portion

[0047] 32 Upper spring component

[0048] 34 Lower spring component

[0049] 36 Intermediate support body side fixing portion (outer side)

[0050] 38 Lens support body side fixing portion (inner portion)

[0051] 40 Elastic arm

[0052] 42 Intermediate support body side fixing portion (outer side)

[0053] 44 Lens support body side fixing portion (inner portion)

[0054] 46 Elastic Arm

[0055] 48 Basic components

[0056] 50 Coil assembly

[0057] 52, 54 Light passing holes

[0058] 56 Coil substrate

[0059] 58 Wiring board

[0060] 60 External connection terminal

[0061] 62 second elastic portion

[0062] 64 Wire

[0063] 65 Metal wire fixing part

[0064] 66 First Resin

[0065] 68 Second resin [Specific implementation method]

[0066] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0067] Figures 1 to 4 The driving device 10 according to the first embodiment of the present invention is shown. In this specification, for convenience, one side in the optical axis direction of the lens 12 is referred to as the upper side, and the other side is referred to as the lower side.

[0068] The lens driving device 10 is as follows Figure 1 and Figure 2 As shown, it includes a lens support body 14 supporting the lens 12, an intermediate support body 16 supporting the lens support body 14 to move freely in the optical axis direction of the lens 12, and a base body 18 supporting the intermediate support body 16 to move freely in a direction orthogonal to the optical axis direction together with the lens support body 14. The shielding box 20 has a square shape from the optical axis direction, and the lower end is fixed to the base body 18. The lens support body 14 and the intermediate support body 16 are covered by the shielding box 20 and the base body 18. The shielding box 20 is formed with an incident hole 22 for light to be incident.

[0069] The lens support body 14 has a quadrangular shape when viewed from the optical axis, and the corners are chamfered. A circular lens support hole 24 is formed on the inner side of the lens support body 14 when viewed from the optical axis. After the lens driving device 10 is completed, the lens 12 is fixed to the lens support hole 24. In addition, an autofocus coil (hereinafter referred to as AF coil) 26 is fixed to the lower outer side of the lens support body 14. The copper core wire of the AF coil 26 is wound with the optical axis direction as the winding axis direction and fixed to the outer periphery of the lens support body 14. The AF coil 26 faces the magnet 28 described later in a direction orthogonal to the optical axis direction.

[0070] The intermediate support body 16 forms a rectangular frame body when viewed from the optical axis direction. The corners of the lens support body 14 and the intermediate support body 16 correspond to each other. Magnets 28 are fixed to the four sides of the intermediate support body 16, respectively.

[0071] The first elastic portion 30 is located between the lens support body 14 and the intermediate support body 16 . The lens support body 14 is supported by the first elastic portion 30 and is freely movable relative to the intermediate support body 16 in the optical axis direction.

[0072] The first elastic portion 30 includes an upper spring member 32 formed of a leaf spring and a lower spring member 34 also formed of a leaf spring.

[0073] The upper spring member 32 is divided into two parts, each having two intermediate support body side fixing parts (hereinafter referred to as the outer part) 36, one lens support body side fixing part (hereinafter referred to as the inner part) 38, and two elastic arm parts 40 connecting the outer part 36 and the inner part 38. The outer part 36 is fixed to the corner of the upper surface of the intermediate support body 16 by adhesive or the like. The inner part 38 is fixed to the upper surface of the lens support body 14 by adhesive or the like. One side of each elastic arm part 40 is connected to the outer part 36, extends from the outer part 36 along the edge to the center of the edge of the intermediate support body 16, bends inwardly in the center of the edge into a reverse S shape, and then bends outwardly into an S shape, and the other side extends along the edge to the vicinity of the corner of the other side of the intermediate support body 16, bends inwardly and connects to the inner part 38. That is, the elastic arm part 40 is bent, and the reverse S-shaped part and the S-shaped part in the middle are opposite to each other. One inner part 38 connects the two elastic arm parts 40. In this way, the elastic arm portion 40 connects the corner portion of the intermediate support body 16 and the corner portion of the lens support body 14 adjacent to the corner portion.

[0074] The lower spring member 34 is not divided, but like the upper spring member 32, it has a square ring-shaped intermediate support body side fixing portion (hereinafter referred to as the outer portion) 42, a circular ring-shaped lens support body side fixing portion (hereinafter referred to as the inner portion) 44, and four elastic arm portions 46 connecting the outer portion 42 and the inner portion 44. The outer portion 42 is fixed to the corner of the lower side of the intermediate support body 16 by adhesive or the like. The inner portion 44 is fixed to the lower side of the lens support body 14 by adhesive or the like. The elastic arm portion 46 extends from the outer portion 42 to the inner portion 44 through several bent portions in order to avoid the magnet 28 described later.

[0075] The base body 18 has a quadrangular shape when viewed from the optical axis. The corners of the base body 18 and the intermediate support body 16 correspond to each other. The base body 18 has a base component 48 and a coil assembly 50. Light passing holes 52 and 54 for passing light are formed on the base component 48 and the coil assembly 50, respectively. The coil assembly 50 is fixed on the upper surface of the base component 48.

[0076] The coil assembly 48 includes a coil substrate 56 and a wiring substrate 58. A jitter compensation coil (not shown) is formed on each of the four sides of the coil substrate 56. The jitter compensation coil faces the lower surface of the magnet 28. The jitter compensation coil is electrically connected to the wiring substrate 58.

[0077] On the wiring substrate 58, an external connection terminal 60 is formed on one side of the wiring substrate 58 and protrudes downward. The external connection terminal 60 is exposed to the outside.

[0078] The intermediate support body 16 is supported by the second elastic part 62 and is freely movable relative to the base body 18 in a direction perpendicular to the optical axis direction of the lens 12. The second elastic part 62 has four metal wires 64 in structure. These four metal wires 64 are provided between the base body 18 and the upper spring member 32 at the corners of the base body 18. The lower ends of the metal wires 64 are fixed to the wiring substrate 58 at the corners of the base body 18. Moreover, the upper ends of the metal wires 64 are fixed to the metal wire fixing parts 65 protruding further outward from the outer side part 36 of the upper spring member 32. The metal wires 64, together with the intermediate support body 16, support the lens support body 14, the magnet 26, the upper spring member 32 and the lower spring member 34 as a movable body, allowing the movable body to move in a direction perpendicular to the optical axis direction of the lens 12.

[0079] Two of the metal wires 64 also serve as wiring, with the lower ends being electrically connected to the wiring substrate 58 and the upper ends being electrically connected to the upper spring member 32. That is, the current for focusing from the external connection terminal 60 of the wiring substrate 54 flows to the AF coil 26 through one end of the upper spring member 32 divided into two parts by one of the metal wires 32, and further flows out from the external connection terminal 60 of the wiring substrate 58 through the other end of the upper spring member 32 and the other metal wire 64.

[0080] The lens support 14 is provided with a lens 12 and a light receiving sensor (not shown) mounted thereon, forming a photographic device. In the photographic device, light input from a subject through the lens 12 is detected by a light receiving sensor (not shown). The movement amount of the lens 12 for focusing the subject is calculated by a controller provided on the photographic device. The controller controls so that a current corresponding to the movement amount of the lens flows to the AF coil 26. When the current flows into the AF coil 26, a Lorentz magnetic force is generated to the AF coil 26 due to the magnetic flux from the magnet 28, and the lens 12, the AF coil 26 and the lens support 14 resist against the upper spring component 32 and the lower spring component 34, and move so that the focus is focused.

[0081] Moreover, if the photographic device shakes, the offset direction and offset amount are detected by a sensor not shown in the figure, and the coil for shake compensation is energized to cause the movable body including the lens 12 to generate a reaction force of the Lorentz magnetic force, which resists the elastic force of the metal wire 64 and moves in a direction orthogonal to the optical axis direction of the lens 12 to perform shake compensation.

[0082] When performing the focusing or jitter compensation, if the lens support 14 or the intermediate support 16 is stopped, vibration will be generated. Therefore, in order to suppress such vibration, Figure 3 and Figure 4As shown, a first resin 66 and a second resin 68 having viscoelasticity such as silicone resin are provided. The resin having viscoelasticity is a so-called damping gel.

[0083] The first resin 66 is provided between the lens support body 14 and the intermediate support body 16. The first resin 66 is provided at four sides of the quadrangular shape, and can be 90 degrees rotationally symmetrical with the optical axis of the lens 12 as the center. In the first embodiment, the first resin 66 is provided so that the reverse S-shaped portion and the S-shaped portion of the upper spring member 32 are bridged. If the lens support body 14 vibrates up and down, the lens support body side of the upper spring member 32 vibrates, but the vibration can be suppressed by the first resin 66.

[0084] Furthermore, in the first embodiment, the first resin 66 bridges between the upper spring members 32, but may directly bridge between the upper spring members 32 and the intermediate support body 16. In any case, the first resin 66 is preferably provided near the center of each side.

[0085] The second resin 68 is arranged between the intermediate support body 16 and the base body 18. The second resin 68 is arranged at four locations like the first resin 66, and can be rotationally symmetrical by 90 degrees with the optical axis of the lens 12 as the center. In this first embodiment, the second resin 68 is arranged at the corners of the intermediate support body 16 and the base body 18. Specifically, the second resin 68 bridges between the bottom of the intermediate support body 16 and the top of the coil substrate 56. Moreover, the second resin 68 is arranged near the metal wire 64 which is also arranged at the corner. In this way, since the second resin 68 is arranged near the metal wire 64, it is easy to suppress the vibration of the intermediate support body 16 transmitted from the metal wire 64.

[0086] The configuration of the first resin 66 and the second resin 68 in the first embodiment is as follows. That is, the first resin 66 is configured at 4 locations on the sides of the quadrilateral, and can be rotationally symmetrical about the optical axis of the lens. The second resin 68 is configured at 4 locations on the corners of the quadrilateral, and can be rotationally symmetrical about the optical axis of the lens. The first resin 66 is located in the middle of two adjacent second resins 68 in the circumferential direction as viewed from the optical axis direction of the lens. Moreover, the first resin 66 and the second resin 68 are configured at 8 locations in the circumferential direction as viewed from the direction of light from the lens. With such a configuration, the positions of the first resin 66 and the second resin 68 can be kept balanced.

[0087] Figures 5 to 7 A lens driving device 10 according to a second embodiment of the present invention is shown.

[0088] The second embodiment is different from the first embodiment mainly in the following three points.

[0089] (1) Arrangement and shape of AF coil 26

[0090] (2) Shape of upper spring member 32

[0091] (3) Position where the first resin 66 is provided

[0092] The AF coil 26 of the first embodiment is arranged on the entire periphery of the lens support body 14 with the optical axis direction as the winding axis direction, whereas the AF coil 26 of the second embodiment is fixed to the outside of the lens support body 14 on opposite sides with the direction perpendicular to the optical axis direction as the winding axis direction. Moreover, the AF coil 26 is composed of a portion extending linearly in a direction perpendicular to the optical axis direction of the lens 12 on both sides, and a semicircular portion connecting the linearly extending portions. The linearly extending portions on the lower sides of the two AF coils 26 face the two magnets 28 fixed to the intermediate support body 16, and work together with the magnets 28 to drive the lens support body 14 in the optical axis direction of the lens 12.

[0093] The elastic arm portion 40 of the upper spring component 32 of the first embodiment extends from the position of the corner to the position of the adjacent corner. In contrast, the elastic arm portion 40 of the upper spring component 32 of the second embodiment extends along the two sides of the lens support body 14 where the AF coil 26 is not provided, forming a shape that returns halfway.

[0094] The first resin 66 in the first embodiment is provided on the upper spring member 32, and opposite thereto, as shown in FIG. Figure 6 as well as Figure 7 As shown, the first resin 66 of the second embodiment is provided at the corners of the lens support 14 and the intermediate support 16. Furthermore, the first resin 66 bridges the outer surface of the lens support 14 and the inner surface of the intermediate support 16.

[0095] In the second embodiment, the first resin 66 and the second resin 68 are respectively arranged at the corners of the lens driving device 10, and are arranged at 90-degree rotationally symmetrical positions. That is, the first resin 66 is arranged at 4 positions of the corners of the quadrilateral, and can be rotationally symmetrical about the optical axis of the lens. The second resin 68 is arranged at 4 positions of the corners of the quadrilateral, and can be rotationally symmetrical about the optical axis of the lens. The first resin 66 is substantially at the same position as the second resin 68 in the circumferential direction from the direction of the optical axis of the lens. Moreover, the first resin 66 and the second resin 68 are arranged at 4 positions in the circumferential direction from the direction of the light of the lens. Through this configuration, the positions of the first resin 66 and the second resin 68 can be kept balanced.

[0096] In addition, the same reference numerals are given to the same parts of the second embodiment as those of the first embodiment in the drawings, and the description thereof is omitted.

[0097] Moreover, in the first and second embodiments, a quadrilateral lens driving device 10 is described, but the present invention is not limited to this. For example, from the optical axis direction, the lens 12 may also be circular. Moreover, the positions of the first resin 66 and the second resin 68 are rotationally symmetrical with the optical axis of the lens 12 as the center, but may also be staggered in 2 or 3 places. At this time, the first resin 66 and the second resin 68 may be alternately arranged in the circumferential direction. Moreover, in the first and second embodiments, the second resin 68 is arranged at each corner, but may also be arranged at each side.

Claims

1. A lens driving device, characterized in that: include: a lens support body for supporting the lens; An intermediate support body that supports the lens support body to move freely; A base body supporting the free movement of the intermediate support body; A first resin provided between the lens support body and the intermediate support body, having viscoelasticity and arranged at at least two locations so as to be rotationally symmetrical about the optical axis of the lens; as well as A second resin having viscoelasticity and disposed between the intermediate support and the base, and disposed at at least two locations so as to be rotationally symmetrical about the optical axis of the lens; Among them, the first resin is located at the same position as the second resin in the circumferential direction or in the middle of two adjacent second resins when viewed from the optical axis direction of the lens, and the first resin and the second resin are arranged at at least 4 positions in the circumferential direction when viewed from the optical axis direction of the lens.

2. The lens driving device according to claim 1, characterized in that: The lens support body is supported by a first elastic portion so as to be movable relative to the intermediate support body, and the first resin is provided on the first elastic portion.

3. The lens driving device according to claim 2, characterized in that: The intermediate support body and the lens support body are quadrangular in shape when viewed from the optical axis direction of the lens, and the corners of the intermediate support body and the lens support body correspond to each other; The first elastic part has an elastic arm part connecting a corner of the intermediate support body and a corner of the lens support body adjacent to the corner. The first resin bridges the bent portions of the elastic arm portions facing each other at the middle thereof.

4. The lens driving device according to claim 1, characterized in that: The intermediate support body and the lens support body are quadrilateral when viewed from the optical axis direction of the lens, and the corners of the intermediate support body and the lens support body correspond to each other. The first resin forms a bridge between the outer surface of the lens support body parallel to the optical axis direction of the lens and the inner surface of the intermediate support body parallel to the outer surface at the corner of the quadrangle.

5. The lens driving device according to claim 1, characterized in that: The intermediate support body and the base body are supported by a second elastic portion so as to be freely movably supported, and the second resin is provided near the second elastic portion to suppress vibration transmitted from the second elastic portion.

6. The lens driving device according to claim 5, characterized in that: The second elastic parts are arranged at four corners of the quadrangular base body, and the second resin bridges between the lower surface of the intermediate support body and the upper surface of the base body.

7. The lens driving device according to claim 1, characterized in that: The lens support body, the intermediate support body, and the base body are in a quadrangular shape when viewed from the optical axis direction of the lens, and the first resin and the second resin are arranged at respective corners of the quadrangular shape.

8. The lens driving device according to claim 1, characterized in that: The lens support body, the intermediate support body, and the base body are in a quadrangular shape when viewed from the optical axis direction of the lens, and the first resin and the second resin are arranged on respective sides of the quadrangular shape.

9. The lens driving device according to claim 1, characterized in that: The lens support body, the intermediate support body and the base body are in a quadrangular shape when viewed from the optical axis direction of the lens, and one of the first resin and the second resin is arranged at a corner of the quadrangular shape and the other is arranged at a side of the quadrangular shape.

10. The lens driving device according to claim 1, characterized in that: The first resin and the second resin are arranged to be staggered in the optical axis direction of the lens.

11. A photographic device, characterized in that: The invention comprises the lens driving device according to any one of claims 1 to 10, a lens supported by the lens support body, and a light receiving sensor for receiving light from the lens.

12. An electronic device, characterized in that: A photographic device according to claim 11.

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