CN112904640A

CN112904640A - Optical member driving device, camera device, and electronic apparatus

Info

Publication number: CN112904640A
Application number: CN201911220580.4A
Authority: CN
Inventors: 和出达贵
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Motor Co Ltd; New Shicoh Technology Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2021-06-04

Abstract

The invention provides an optical component driving device, a camera device and an electronic device with high reliability and easy manufacture. The OIS lens driving device (2) is provided with a base (3), a lower curling plate (4) fixed on the base (3), an upper curling plate (5) sliding on the lower curling plate (4), and a plurality of SMA cables (6) with two ends fixed on the lower curling plate (4) and the upper curling plate (5). Thus, the upper curl plate (5), which is one of the lower curl plate (4) and the upper curl plate (5), has a convex portion (50) that protrudes toward the other lower curl plate (4), and is in contact with the contacted portion provided on the other.

Description

Optical member driving device, camera device, and electronic apparatus

Technical Field

The present invention relates to an optical component driving device, a camera device, and an electronic device used in an electronic device such as a smartphone.

Background

Some camera apparatuses having an OIS (Optical Image Stabilizer) function include a camera apparatus in which an SMA (Memory Alloy) cable is disposed between a movable member holding an Optical member and a support member supporting the movable member, and the movable member and the support member are relatively moved by expansion and contraction of the SMA cable. As a document disclosing a technique related to such a camera device, there is patent document 1. The suspension unit described in patent document 1 includes: a movable member as a plate body, which is made of stainless steel; and a support member as a plate body, in which a wiring portion formed of an FPC (Flexible Printed Circuits) is provided on the base. The movable member and the support member are disposed to face each other with the plurality of bearings interposed therebetween, and each of the support member and the movable member has a bent portion at a corner thereof in a diagonal direction and at a corner thereof in a diagonal direction intersecting the corner. An SMA wire is laid between the crimps of the movable member and the crimps of the support member. A plurality of bearings are fixed to the support member.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] International publication No. WO2018/129185A

Disclosure of Invention

[ problem to be solved by the invention ]

However, the technical problem of patent document 1 is that it is difficult to secure sufficient reliability and to manufacture the bearing because a plurality of very small bearings are fixed to a support member and accuracy of dimensional variation in the height direction and bonding strength are required.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical component driving device, a camera device, and an electronic apparatus which are highly reliable and easy to manufacture.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

In order to solve the above problem, an optical component driving device according to a preferred embodiment of the present invention includes: a base; a lower curl plate fixed to the base; an upper curl plate that slides on the lower curl plate; and a plurality of SMA wires having both ends fixed to the lower curl plate and the upper curl plate, wherein one of the lower curl plate and the upper curl plate has a convex portion protruding toward the other, and is in contact with a contacted portion provided on the other.

In this aspect, an insulating layer may be provided on a surface of the convex portion or a surface of the abutted portion.

Further, a low friction layer may be provided on a surface of the convex portion not provided with the insulating layer, a surface of the abutted portion, or a surface of the insulating layer.

In addition, a metal layer may be provided on a surface of the insulating layer.

Further, the convex portion and the contacted portion may have the same potential.

Further, an FPC for fixing the lower curl plate to the upper side may be fixed to the base.

A camera device according to another preferred embodiment of the present invention includes the optical member driving device.

An electronic device according to another preferred embodiment of the present invention includes the camera device.

[ Effect of the invention ]

The optical component driving device of the present invention comprises: a base; a lower curl plate fixed to the base; an upper curl plate that slides on the lower curl plate; and a plurality of SMA wires having both ends fixed to the lower curl plate and the upper curl plate, wherein one of the lower curl plate and the upper curl plate has a convex portion protruding toward the other, and is in contact with a contacted portion provided on the other. Therefore, it is not necessary to fix a plurality of very small components, and the optical component driving device of the present invention has high reliability and is easy to manufacture. Therefore, it is possible to provide an optical component driving device, a camera device, and an electronic apparatus which are highly reliable and easy to manufacture.

Drawings

Fig. 1 is a front view of a smartphone 99, and the smartphone 99 is an electronic device on which a camera apparatus 1 including an OIS lens driving apparatus 2 as an optical component driving apparatus according to an embodiment of the present invention is mounted.

Fig. 2 is a perspective view of the camera device 1 of fig. 1.

Fig. 3 is a perspective view of the OIS lens driving apparatus 2 of fig. 2.

Fig. 4 is a perspective view of the OIS lens driving apparatus 2 of fig. 2 exploded.

Fig. 5 (a) is a view of a part of the upper curl plate 5 of the OIS lens driving apparatus 2 of fig. 2 viewed obliquely from below, (B) is a cross-sectional view showing a contact portion between the convex portion 50 of the upper curl plate 5 and the 3 rd plate piece 40C of the lower curl plate 4, and (C) is a view of parts of the upper curl plate 5 and the lower curl plate 4 viewed obliquely from above.

[ notation ] to show

1 a camera device; 2OIS lens drive; 3, a base; 4 lower curl plate; 5 an upper curl plate; 6SMA wires; 7 FPC; 8 lens bodies; 36 a support sheet; 37 a through hole; 38. 88 a terminal block; 39 terminal; 40A No. 1 sheet; 40B a 2 nd plate; 40C No. 3 sheet; 41. 43, 51 cuts; 42A, 42B, 52A, 52B curl portions; 50 convex parts; 54 a body portion; 55 a wrist portion; 56 a connecting part; 57 a through hole; 71 bonding pads; an 80AF actuator; 90 an image sensor; 98 a housing; 99 smart phones.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. As shown in fig. 1, the camera device 1 is housed in a housing of a smartphone 99. The camera apparatus 1 has: a lens body 8 as an optical member; an image sensor 90 that photoelectrically converts light incident from a subject via the lens body 8; an AF (Auto focus) actuator 80 that drives the lens body 8 in the optical axis direction; an OIS lens driving device 2 that drives the AF actuator 80 in a plane orthogonal to the optical axis; and a housing 98 covering these components. The lens body 8 as an optical member is driven by the OIS lens driving device 2 in an in-plane direction orthogonal to the optical axis.

Hereinafter, the optical axis direction along the optical axis of the lens body 8 is appropriately referred to as the Z direction, one direction orthogonal to the Z direction is appropriately referred to as the X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as the Y direction. In addition, the + Z side of the optical axis of the lens body 8 on the side of the object may be referred to as the upper side, and the Z side opposite to the object on which the image sensor 90 is provided may be referred to as the lower side.

As shown in fig. 4, the OIS lens driving apparatus 2 includes: a base 3; a lower curl plate 4 fixed to the base 3; an upper curl plate 5 sliding on the lower curl plate 4; and 4 SMA cables 6 fixed at both ends to the lower curl plate 4 and the upper curl plate 5. The details of the structure of each part will be described below.

The base 3 is in the shape of a thin quadrilateral. A through hole 37 having a perfect circular shape is provided in the center of the base 3. A support piece 36 and a terminal block 38 are provided on the X-side edge of the base 3. The support piece 36 is used to support the terminal stand 88 of the AF actuator 80 from the back side. The AF actuator 80 and the terminal block 88 are connected by an FPC. Five terminals 39 are provided on the terminal block 38 of the base 3. One of the five terminals 39 is a ground terminal. The remaining 4 are current input terminals.

An FPC7 is fixed to the upper surface of the base 3. The pads 71 are provided at six positions on the periphery of the through hole 37 of the FPC 7. The FPC7 is a circuit board and has wirings from the pads 71 to the terminals 39.

The lower curl plate 4 is disposed so that the pair of the 1 st plate piece 40A, the pair of the 2 nd plate piece 40B, and the pair of the 3 rd plate piece 40C having the arcuately curved sides face inward with the curved sides, and has a substantially square outer shape as a whole. The 1 st plate 40A, the 2 nd plate 40B, and the 3 rd plate 40C are made of a conductive material such as SUS, for example. The 1 st sheet 40A, the 2 nd sheet 40B, and the 3 rd sheet 40C are fixed to the FPC7 in a state of being separated from each other.

Each pair of the 1 st plate 40A, the 2 nd plate 40B, and the 3 rd plate 40C is disposed at a point-symmetrical position with respect to the center of the through-hole 37. Thus, the 1 st plate 40A and the 2 nd plate 40B are located at both sides of one diagonal line of the lower curl plate 4 having a substantially square shape, and the 3 rd plate 40C is located at a position facing the other diagonal line of the substantially square shape, which is sandwiched by the 1 st plate 40A and the 2 nd plate 40B.

The 1 st plate 40A has a notch 41 at its bent side and a curled portion 42A at the corner of the substantially square shape. The curled portion 42A is formed by bending a rectangular piece protruding outward in the Y direction with the corner portion as a base end upward and then folding back toward the base end side. Between the curled portion 42A and the bent edge, a step is provided by bending the 1 st sheet 40A so that the height is equal to a height of a curled portion 52A of an upper curled plate 5 to be described later.

A notch 41 is provided at the bent side of the 2 nd plate 40B, and a curled portion 42B is provided at the corner position of the substantially square shape. The curled portion 42B is formed by folding a rectangular piece protruding outward in the X direction with the corner portion as a base end upward and then folding back toward the base end. Between the curled portion 42B and the bent edge, a step is provided by bending the 2 nd sheet piece 40B so that the height is equal to a height of a curled portion 52B of an upper curled plate 5 to be described later.

The 3 rd plate 40C has a notch 41 at the curved side and a notch 43 at the corner where the 2 nd side opposite to the curved side intersects.

The 1 st, 2 nd, and 3

rd sheets

40A, 40B, and 40C are positioned so that each cutout 41 becomes directly above the pad 71 of the FPC7, and is soldered directly to the pad 71 of the FPC 7. The two 1 st plate pieces 40A and the two 2 nd plate pieces 40B are electrically connected to the respective current input terminals of the five terminals 39 of the terminal block 38 via the wirings of the FPC 7. The two 3 rd sheet pieces 40C are electrically connected to one ground terminal of the five terminals 39 of the terminal block 38 via the wiring of the FPC 7.

The upper curl plate 5 is made of a conductive material such as SUS, for example, and has a substantially square

main body

54 and 2 arm portions 55 extending outward from both end edges of the main body 54 parallel to the Y direction in point symmetry. A through hole 57 is provided in the center of the body portion 54. The body 54 has cutouts 51 at six locations around the periphery of the through-hole 57. The main body 54 is provided with protrusions 50 protruding downward at four locations around the periphery of the through-hole 57. As shown in fig. 5 (a), the convex portion 50 protrudes smoothly from the body portion 54, and the lower surface portion thereof has a circular flat plate shape. The convex portion 50 can be formed integrally with the upper curl plate 5 by punching or the like, and therefore is superior to shock resistance such as drop.

The upper curl plate 5 has its corners facing one diagonal direction chamfered to be rounded, and two

curl portions

52A and 52B are provided at the corners facing the other diagonal direction, respectively. The curled portion 52A is formed by folding a rectangular piece, which protrudes outward in the Y direction with the corner portion as a base end, upward and then folding back to the base end side. The curled portion 52B is formed by folding a rectangular piece, which protrudes outward in the X direction with the corner portion as a base end, upward and then folding back to the base end side.

The arm portions 55 project in the Y direction from the base end of the position close to the corner where the curled portion 52B of the end side parallel to the Y direction of the main body portion 54 is located, extend to the corner where the curled portion 52B is not present along the end side in the Y direction, and extend to the front of the curled portion 52A along the end side in the X direction around the outside of the corner. A connection portion 56 is provided at the tip of the wrist portion 55. Two of the projections 50 are provided in the body portion 54 near the connection portion 56.

The lower curl plate 4 and the upper curl plate 5 are sequentially placed on the base 3 so that the corners of the square shape overlap with the corners of the square shape of the base 3. The curled

portions

42A and 42B of the lower curled plate 4 are arranged at one diagonal corner of the substantially square shape, and the curled

portions

52A and 52B of the upper curled plate 5 are arranged at the other diagonal corner of the substantially square shape. At this time, curled portion 42A and curled portion 52A are juxtaposed in the X direction, and curled portion 42B and curled portion 52B are juxtaposed in the Y direction. The arm 55 is disposed between the chamfered corner of the main body 54 and the step formed between the 1 st plate 40A and the 2 nd plate 40B. The notch 51 of the upper curl plate 5 is located right above the notch 41 of the lower curl plate 4, and the solder does not contact the upper curl plate 5.

As shown in fig. 5 (B), two of the four protrusions 50 of the upper curl plate 5 abut against the abutted portions of the 3 rd sheet 40C of the lower curl plate 4. The remaining two of the projections 50 abut against the abutted portions of the 2 nd plate 40B. A low friction layer is formed on the surface of the projection 50, and an insulating layer is formed on the contacted surface of the 3 rd plate 40C and the 2 nd plate 40B contacted with the projection 50. A low friction layer may be formed on the surface of the 3 rd plate 40C and the 2 nd plate 40B to be contacted, and an insulating layer may be formed on the surface of the convex portion 50. Alternatively, the lower curl plate 4 may be provided with a convex portion, and the upper curl plate 5 may be provided with a contacted portion.

The description is made in detail. When one of the convex portions 50 and the abutted portions is provided on the upper curl plate 5 and the other of the convex portions and the abutted portions is provided on the 1 st plate piece 40A or the 2 nd plate piece 40B of the lower curl plate 4, as will be described later, a potential difference is generated between the upper curl plate 5 and the lower curl plate 4. Therefore, an insulating layer is provided on at least one of the surface of the convex portion and the surface of the abutted portion, and the both are insulated from each other. Therefore, the low friction layer having a small friction coefficient is preferably provided on the surface thereof, that is, on the surface of the projection not provided with the insulating layer, or on the surface of the abutted part or on the surface of the insulating layer.

When one of the convex portion 50 and the abutted portion is provided on the upper curl plate 5 and the other is provided on the 3 rd sheet piece 40C of the lower curl plate 4, the upper curl plate 5 and the lower curl plate 4 are at the same potential as described later. Therefore, the convex portion and the abutted portion can be directly abutted without providing an insulating layer. Further, the layer described in the preceding paragraph may be provided, or only the low friction layer may be provided without providing the insulating layer.

As shown in fig. 5 (C), the connecting portion 56 of the upper curl plate 5 is joined to the upper surface of the 3 rd sheet 40C and electrically connected to the 3 rd sheet 40C. Further, two ends 2 of the SMA cable 6 extending in the X direction are respectively fixed to the curled portion 42A and the curled portion 52A by caulking, and two ends 2 of the SMA cable 6 extending in the Y direction are respectively fixed to the curled portion 42B and the curled portion 52B by caulking.

The five terminals 39 of the terminal block 38 are connected to an external power supply. Thus, a current path of the external power supply → the current input terminal → the wiring of the FPC7 → the 1 st or 2

nd sheet

40A or 40B of the lower curl plate 4 → the SMA cable 6 → the upper curl plate 5 → the 3 rd sheet 40C of the lower curl plate 4 → the wiring of the FPC7 → the ground terminal → the external power supply is formed, and the current is supplied to the SMA cable 6. When electric current is supplied to the SMA wires 6, the SMA wires 6 contract due to heat generation by the energization. By contraction of the SMA wire 6, the upper curl plate 5 and the AF actuator 80 supported by the same move in the XY in-plane direction while sliding on the lower curl plate 4.

The above is the structural details of the present embodiment. The OIS lens driving apparatus 2 as the optical component driving apparatus of the present embodiment includes: a base 3; a lower curl plate 4 fixed to the base 3; an upper curl plate 5 sliding on the lower curl plate 4; and a plurality of SMA cables 6 fixed at both ends to the lower curl plate 4 and the upper curl plate 5. Accordingly, the upper curl plate 5, which is one of the lower curl plate 4 and the upper curl plate 5, has a convex portion 50 protruding toward the other lower curl plate 4, and abuts against the abutted portion provided on the other. Thus, according to the present embodiment, since it is not necessary to fix a very small number of components, the OIS lens driving device 2 as the optical component driving device of the present embodiment is highly reliable and easy to manufacture. Therefore, according to the present embodiment, it is possible to provide an optical component driving device, a camera device, and an electronic apparatus which are highly reliable and easy to manufacture.

Further, a metal layer suitable for sliding may be provided on the surface of the insulating layer provided on the surface of the convex portion or the surface of the abutted portion. Further, instead of providing the insulating layer and the low friction layer separately, a layer having both the insulating layer and the low friction layer may be provided. In fig. 4 and 5, the abutted portions are not given any reference numerals and are treated to have the same height with respect to their surroundings, but may be set higher or lower than the surroundings.

Claims

1. An optical component driving device is characterized by comprising:

a base;

a lower curl plate fixed to the base;

an upper curl plate that slides on the lower curl plate; and

a plurality of SMA wires having both ends fixed to the lower and upper crimping plates,

one of the lower curl plate and the upper curl plate has a convex portion protruding toward the other and abuts against a contacted portion provided on the other.

2. Optical component driving device according to claim 1,

an insulating layer is provided on a surface of the convex portion or a surface of the abutted portion.

3. Optical component driving device according to claim 2,

a low friction layer is provided on the surface of the projection not provided with the insulating layer, or on the surface of the abutted part or on the surface of the insulating layer.

4. Optical component driving device according to claim 2,

and a metal layer is arranged on the surface of the insulating layer.

5. Optical component driving device according to claim 1,

the convex portion and the abutted portion are at the same potential.

6. Optical component driving device according to claim 1,

an FPC for fixing the lower curl plate to the upper side is fixed to the base.

7. A camera device comprising the optical member driving device according to any one of claims 1 to 5.

8. An electronic device comprising the camera device according to claim 6.