Optical component driving device, camera device, and electronic device

Abstract

The present invention provides an optical component driving device, a camera device and an electronic device with high reliability and easy manufacturing. The OIS lens driving device (2) comprises 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 both ends fixed to the lower curling plate (4) and the upper curling plate (5). Thus, one of the lower curling plate (4) and the upper curling plate (5), namely the upper curling plate (5), has a convex portion (50) protruding toward the lower curling plate (4) as the other party, and abuts against a contacted portion provided on the other party.

Description

Technical Field

[0001] The present invention relates to an optical component driving device, a camera device, and an electronic device used in electronic devices such as smartphones. Background Art

[0002] In a camera device equipped with an OIS (Optical Image Stabilizer) function, there is a camera device in which an SMA (Shape Memory Alloy) cable is arranged between a movable part holding an optical part and a supporting part supporting the optical part, and the movable part and the supporting part are relatively moved by the expansion and contraction of the SMA cable. As a document that discloses technology related to such a camera device, there is Patent Document 1. The suspension assembly described in Patent Document 1 comprises: a movable part as a plate body, which is made of stainless steel; and a supporting part as a plate body, which has a wiring part made of FPC (Flexible Printed Circuits) arranged on a base. The movable part and the supporting part are arranged opposite to each other with multiple bearings sandwiched between them, and the corners of the supporting part in the diagonal direction and the corners of the movable part in the diagonal direction intersecting therewith have curling parts. The SMA cable is laid between the curling part of the movable part and the curling part of the supporting part. Multiple bearings are fixed to the supporting part.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] International Publication No. WO2018 / 129185A Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, the technical problem of Patent Document 1 is that it is difficult to ensure sufficient reliability because a large number of very small bearings are fixed to the support member and there are requirements for precision of dimensional deviation in the height direction and bonding strength, and further, there are difficulties in manufacturing.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical component driving device, a camera device, and an electronic device that are highly reliable and easy to manufacture.

[0009]

Methods for solving the problem

[0010] In order to solve the above-mentioned problems, an optical component driving device as a preferred embodiment of the present invention comprises: a base provided with a current input terminal and a ground terminal; a flexible printed circuit fixed to the upper surface of the base; a plurality of plates made of conductive material fixed to the upper surface of the flexible printed circuit in a mutually isolated state; an upper curling plate made of conductive material sliding on the lower curling plate; and a plurality of SMA cables fixed at both ends to the lower curling plate and the upper curling plate, wherein a plurality of pads are provided on the flexible printed circuit, and the flexible printed circuit is provided with a plurality of pads. The printed circuit is a circuit substrate having wiring from each soldering pad to the current input terminal or the grounding terminal, and the plurality of plates include an input terminal plate electrically connected to the current input terminal via the wiring of the flexible printed circuit and a grounding plate electrically connected to the grounding terminal via the wiring of the flexible printed circuit. The plurality of plates are directly welded to each of the soldering pads, and a convex portion smoothly protruding from the upper curled plate and formed integrally therewith abuts and slides against abutted portions of the input terminal plate or the grounding plate provided on the lower curled plate.

[0011] In this aspect, an insulating layer may be provided on the surface of the protrusion or the surface of the contacted portion.

[0012] Furthermore, a low friction layer may be provided on a surface of the protrusion where the insulating layer is not provided, a surface of the contacted portion, or a surface of the insulating layer.

[0013] Alternatively, a metal layer may be provided on the surface of the insulating layer.

[0014] Furthermore, the convex portion and the contacted portion provided on the grounding plate may be at the same potential.

[0015] Furthermore, the surface of the contacted portion provided on the grounding plate and the surface of the convex portion contacting the contacted portion may not be provided with an insulating layer, and the convex portion may contact the contacted portion directly or through a low friction layer.

[0016] A camera device as another preferred embodiment of the present invention includes the above-mentioned optical component driving device.

[0017] An electronic device as another preferred embodiment of the present invention includes the above-mentioned camera device.

[0018] [Effects of the invention]

[0019] The optical component driving device of the present invention comprises: a base; a lower curling plate fixed on the base; an upper curling plate sliding on the lower curling plate; and a plurality of SMA cables whose ends are fixed to the lower curling plate and the upper curling plate, wherein one of the lower curling plate and the upper curling plate has a convex portion protruding toward the other and abuts against an abutted portion provided on the other. Therefore, there is no need to fix a plurality of very small parts, and thus 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 device that are highly reliable and easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a front view of a smartphone 99 which is an electronic device equipped with a camera device 1 including an OIS lens driving device 2 which is an optical component driving device according to one embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A stereoscopic view of the camera device 1 is shown in FIG.

[0022] Figure 3 yes Figure 2 A stereoscopic view of the OIS lens driving device 2.

[0023] Figure 4 It is decomposed Figure 2 A stereoscopic view of the OIS lens driving device 2.

[0024] Figure 5 (A) is viewed from the oblique lower side Figure 2 (B) is a diagram of a portion of the upper curling plate 5 of the OIS lens driving device 2, (B) is a cross-sectional view showing the abutment portion between the protrusion 50 of the upper curling plate 5 and the third plate piece 40C of the lower curling plate 4, and (C) is a diagram of a portion of the upper curling plate 5 and the lower curling plate 4 observed from an oblique upper side.

[0025]

Explanation of symbols

[0026] 1 camera device; 2 OIS lens drive device; 3 base; 4 lower curling plate; 5 upper curling plate; 6 SMA cable; 7 FPC; 8 lens body; 36 support plate; 37 through-hole; 38, 88 terminal block; 39 terminal; 40A first plate; 40B second plate; 40C third plate; 41, 43, 51 cutouts; 42A, 42B, 52A, 52B curling parts; 50 convex part; 54 main body; 55 wrist; 56 connecting part; 57 through-hole; 71 pad; 80 AF actuator; 90 image sensor; 98 housing; 99 smart phone. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the camera device 1 is accommodated in a housing of a smartphone 99. The camera device 1 includes: a lens body 8 as an optical component; an image sensor 90 that performs photoelectric conversion on light incident from a subject through the lens body 8; an AF (Auto focus) actuator 80 that drives the lens body 8 in a direction along the optical axis; an OIS lens driving device 2 that drives the AF actuator 80 in a plane orthogonal to the optical axis; and a housing 98 that covers these components. The lens body 8 as an optical component is driven by the OIS lens driving device 2 in a direction in a plane orthogonal to the optical axis.

[0028] Hereinafter, the optical axis direction along the optical axis of the lens body 8 is appropriately referred to as the Z direction, a direction perpendicular to the Z direction is appropriately referred to as the X direction, and a direction perpendicular 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 located on the subject side is sometimes referred to as the upper side, and the Z side on the side opposite to the subject where the image sensor 90 is provided is sometimes referred to as the lower side.

[0029] like Figure 4 As shown, the OIS lens driving device 2 includes: 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 four SMA cables 6 with both ends fixed to the lower curling plate 4 and the upper curling plate 5. The following describes the structural details of each part.

[0030] The base 3 is in the shape of a thin quadrilateral. A through hole 37 in the shape of a perfect circle is provided at the center of the base 3. A support piece 36 and a terminal block 38 are provided at the X-side end edge of the base 3. The support piece 36 is used to support the terminal block 88 of the AF actuator 80 from the inside. 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 four are current input terminals.

[0031] The FPC 7 is fixed to the upper surface of the base 3. The FPC 7 has pads 71 ​​provided at six locations around the through hole 37. The FPC 7 is a circuit board and has wiring from each pad 71 to each terminal 39.

[0032] The lower curling plate 4 is configured so that the first plate 40A, the second plate 40B, and the third plate 40C, which have arc-shaped curved edges, face inward with their curved edges, and form a generally square shape as a whole. The first plate 40A, the second plate 40B, and the third plate 40C are made of a conductive material such as SUS, for example. The first plate 40A, the second plate 40B, and the third plate 40C are fixed to the FPC 7 in a mutually isolated state.

[0033] Each pair of the first plate piece 40A, the second plate piece 40B, and the third plate piece 40C is arranged at a point-symmetrical position with respect to the center of the through hole 37. Thus, the first plate piece 40A and the second plate piece 40B are located at both sides of a diagonal line sandwiching the lower curling plate 4 in a substantially square shape, and the third plate piece 40C is located at a position sandwiched by the first plate piece 40A and the second plate piece 40B and facing the other diagonal direction of the substantially square shape.

[0034] A cutout 41 is provided on the curved side of the first plate piece 40A, and a curled portion 42A is provided at the corner position of the substantially square. The curled portion 42A is formed by bending a rectangular piece protruding outward in the Y direction with the corner as the base end upward and then folding back toward the base end side. Between the curled portion 42A and the curved side, the first plate piece 40A is bent so that the height is equal to that of the curled portion 52A of the upper curled plate 5 described later to provide a step.

[0035] A cutout 41 is provided on the curved side of the second plate piece 40B, and a curling portion 42B is provided at the corner position of the substantially square. The curling portion 42B is formed by bending a rectangular piece protruding outward in the X direction with the corner as the base end toward the upper side and then folding back toward the side of the base end. Between the curling portion 42B and the curved side, the second plate piece 40B is bent so that the height is equal to that of the curling portion 52B of the upper curling plate 5 described later to provide a step.

[0036] A notch 41 is provided at the curved side of the third plate piece 40C, and a notch 43 is provided at a corner where two sides on the opposite side to the curved side intersect.

[0037] The first plate 40A, the second plate 40B, and the third plate 40C are positioned so that each cutout 41 is directly above the pad 71 of the FPC 7 and is directly soldered to the pad 71 of the FPC 7. The two first plates 40A and the two second plates 40B are electrically connected to the current input terminals of the five terminals 39 of the terminal block 38 via the wiring of the FPC 7. The two third plates 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.

[0038] The upper curling plate 5 is made of a conductive material such as SUS, and has a substantially square main body 54 and two arm portions 55 extending outwardly in a point-symmetrical manner from two end sides of the main body 54 parallel to the Y direction. A through hole 57 is provided at the center of the main body 54. Notches 51 are provided at six locations around the through hole 57 in the main body 54. Convex portions 50 protruding downward are provided at four locations around the through hole 57 in the main body 54. Figure 5As shown in (A), the convex portion 50 protrudes smoothly from the main body 54, and its lower portion is in the shape of a circular flat plate. The convex portion 50 can be formed integrally with the upper curling plate 5 by punching or the like, and therefore has excellent impact resistance such as being dropped.

[0039] The corners of the upper curling plate 5 facing one diagonal direction are chamfered to be rounded, and the corners facing the other diagonal direction are provided with two curling parts 52A and 52B, respectively. The curling part 52A is formed by bending a rectangular piece protruding outward in the Y direction with the corner as the base end, and then folding back to the side of the base end. The curling part 52B is formed by bending a rectangular piece protruding outward in the X direction with the corner as the base end, and then folding back to the side of the base end.

[0040] The arm portion 55 protrudes in the Y direction from the base end of the end side parallel to the Y direction of the main body 54, where the curled portion 52B is located, and extends along the Y direction end side to the corner on the side where the curled portion 52B does not exist, and then goes around the outside of the corner and extends along the X direction end side to the front of the curled portion 52A. A connection portion 56 is provided at the front end of the arm portion 55. Two of the protrusions 50 are provided at positions close to the connection portion 56 in the main body 54.

[0041] The lower curling plate 4 and the upper curling plate 5 are placed in order on the base 3 in such a manner that the corners of each of the roughly square shapes overlap the corners of the roughly square shape of the base 3. The curling portions 42A and 42B of the lower curling plate 4 are arranged at the corners of one diagonal direction of the roughly square shape, and the curling portions 52A and 52B of the upper curling plate 5 are arranged at the corners of the other diagonal direction of the roughly square shape. At this time, the curling portion 42A and the curling portion 52A are arranged side by side in the X direction, and the curling portion 42B and the curling portion 52B are arranged side by side in the Y direction. In addition, the wrist portion 55 is arranged between the chamfered corner of the main body portion 54 and the step formed between the first plate piece 40A and the second plate piece 40B. In addition, the cutout 51 of the upper curling plate 5 becomes directly above the cutout 41 of the lower curling plate 4, and the solder does not contact the upper curling plate 5.

[0042] like Figure 5 As shown in (B), two of the four protrusions 50 in the upper curling plate 5 abut against the abutted portion of the third plate 40C of the lower curling plate 4. The remaining two protrusions 50 abut against the abutted portion of the second plate 40B. A low friction layer is formed on the surface of the protrusion 50, and an insulating layer is formed on the surface of the abutted portion of the third plate 40C and the second plate 40B abutted by the protrusion 50. Alternatively, a low friction layer may be formed on the surface of the abutted portion of the third plate 40C and the second plate 40B, and an insulating layer may be formed on the surface of the protrusion 50. Alternatively, a protrusion may be provided on the lower curling plate 4, and a contacted portion may be provided on the upper curling plate 5.

[0043] Described in detail. When the upper curling plate 5 is provided with a protrusion 50 or a contacted portion, and the first plate 40A or the second plate 40B of the lower curling plate 4 is provided with a protrusion or a contacted portion, as will be described later, there is a potential difference between the upper curling plate 5 and the lower curling plate 4. Therefore, an insulating layer is provided on at least one of the surface of the protrusion or the surface of the contacted portion, and the two are insulated. Therefore, it is preferred that a low friction layer with a small friction coefficient is provided on the surface thereof, that is, on the surface of the protrusion where the insulating layer is not provided or on the surface of the contacted portion or on the surface of the insulating layer.

[0044] When the upper curling plate 5 is provided with one of the protrusion 50 and the abutted portion, and the third plate 40C of the lower curling plate 4 is provided with the other of the protrusion and the abutted portion, as will be described later, the upper curling plate 5 and the lower curling plate 4 are at the same potential. Therefore, there is no need to provide an insulating layer, and the protrusion and the abutted portion can also directly abut. In addition, the layer described in the previous paragraph may be provided, or only the low friction layer may be provided without providing an insulating layer.

[0045] like Figure 5 As shown in (C), the connection portion 56 of the upper curling plate 5 is bonded to the upper surface of the third plate 40C and is electrically connected to the third plate 40C. In addition, two ends of the SMA cable 6 extending along the X direction are riveted and fixed to the curling portion 42A and the curling portion 52A, respectively, and two ends of the SMA cable 6 extending along the Y direction are riveted and fixed to the curling portion 42B and the curling portion 52B, respectively.

[0046] The five terminals 39 of the terminal block 38 are connected to an external power source. Thus, a current path is formed, which is external power source → current input terminal → wiring of FPC 7 → first plate 40A or second plate 40B of the lower curling plate 4 → SMA cable 6 → upper curling plate 5 → third plate 40C of the lower curling plate 4 → wiring of FPC 7 → ground terminal → external power source, and current is supplied to the SMA cable 6. When current is supplied to the SMA cable 6, the SMA cable 6 contracts due to the heat generated by the energization. Due to the contraction of the SMA cable 6, the upper curling plate 5 and the AF actuator 80 supported by it slide on the lower curling plate 4 while moving in the XY in-plane direction.

[0047] The above are the structural details of the present embodiment. The OIS lens driving device 2 as the optical component driving device of the present embodiment comprises: 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 whose two ends are fixed to the lower curling plate 4 and the upper curling plate 5. Thus, one of the lower curling plate 4 and the upper curling plate 5, namely the upper curling plate 5, has a protrusion 50 protruding toward the lower curling plate 4 as the other party, and abuts against the abutted portion provided on the other party. Therefore, according to the present embodiment, it is not necessary to fix a very small number of parts, so the OIS lens driving device 2 as the optical component driving device of the present embodiment has high reliability and is 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 device that are highly reliable and easy to manufacture.

[0048] In addition, 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. In addition, 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. Figure 4 and Figure 5 In the figure, the abutted portion is not assigned a symbol and is treated as having the same height as its surroundings, but it may be set higher or lower than the surroundings.

Claims

1. An optical component driving device, characterized in that: have: A base having a current input terminal and a grounding terminal; a flexible printed circuit fixed to the upper surface of the base; A plurality of plates made of conductive material are fixed to the lower curling plate on the upper surface of the flexible printed circuit in a mutually isolated state; an upper curling plate composed of a conductive material sliding on the lower curling plate; and A plurality of SMA cables having both ends fixed on the lower crimping plate and the upper crimping plate, The flexible printed circuit is provided with a plurality of pads, and the flexible printed circuit is a circuit substrate having wiring from each pad to the current input terminal or the ground terminal. The plurality of plates include an input terminal plate electrically connected to the current input terminal via the wiring of the flexible printed circuit and a grounding plate electrically connected to the grounding terminal via the wiring of the flexible printed circuit, and the plurality of plates are directly welded on each of the pads. The convex portion which is formed integrally and smoothly protrudes from the upper rolled plate abuts and slides against a contacted portion of the input terminal plate piece or the grounding plate piece provided on the lower rolled plate.

2. The optical component driving device according to claim 1, characterized in that: An insulating layer is provided on a surface of the protrusion or a surface of the contacted portion.

3. The optical component driving device according to claim 2, characterized in that: A low friction layer is provided on a surface of the convex portion where the insulating layer is not provided, a surface of the abutted portion, or a surface of the insulating layer.

4. The optical component driving device according to claim 2, characterized in that: A metal layer is provided on the surface of the insulating layer.

5. The optical component driving device according to claim 1, characterized in that: The protrusion and the contacted portion provided on the grounding plate have the same potential.

6. The optical component driving device according to claim 5, characterized in that: The surface of the contacted portion provided on the grounding plate and the surface of the convex portion contacting the contacted portion are not provided with an insulating layer, and the convex portion contacts the contacted portion directly or through a low friction layer.

7. A camera device, characterized in that: An optical component driving device according to any one of claims 1 to 6.

8. An electronic device, characterized in that: A camera device according to claim 7.

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