Lens driving device and camera module

Abstract

Provided is a lens driving device that is easier to assemble. The lens driving device (101) is provided with four shape memory alloy wires (SA), one end of which is different from the other end of which is different in height. The base member (18) has a fixed-side upper mounting surface (FSU) and a fixed-side lower mounting surface (FSD), which have different heights, and the lens holding member (2) has a movable-side upper mounting surface (MSU) and a movable-side lower mounting surface (MSD), which have different heights. Each of the four fixed-side metal members (5F) has one end of a corresponding one of the four shape memory alloy wires (SA) fixed thereto, and is attached to the corresponding fixed-side upper mounting surface (FSU) or fixed-side lower mounting surface (FSD). The other end of the corresponding one of the four shape memory alloy wires (SA) is fixed to each of the four movable-side metal members (5M), and the four movable-side metal members (5M) are attached to the corresponding movable-side upper mounting surfaces (MSU) or movable-side lower mounting surfaces (MSD).

Description

Technical Field

[0001] The present disclosure relates to a lens driving device and a camera module. Background Art

[0002] Conventionally, a lens driving device using eight shape memory alloy wires is known (see Patent Document 1). In this device, the eight shape memory alloy wires are fixed to a metal component (connection plate) which is respectively fixed to four side surfaces of a base component and four side surfaces of a lens holding component.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-073558 Summary of the invention

[0006] Technical problem that the invention will solve

[0007] However, this device requires the wiring board to be mounted on the four sides of the base member and the lens holding member from four directions, and thus is difficult to assemble.

[0008] Therefore, it is desirable to provide a lens driving device that is easier to assemble.

[0009] Means for solving technical problems

[0010] The lens driving device of one embodiment of the present invention comprises: a base component; a lens holding component having a cylindrical portion capable of holding a lens body and capable of moving relative to the base component; a plurality of fixed-side metal components fixed to the base component; a plurality of movable-side metal components fixed to the lens holding component; and a plurality of shape memory alloy wires, wherein the shape memory alloy wires are configured such that one end portion is fixed to a corresponding one of the fixed-side metal components and the other end portion is fixed to a corresponding one of the movable-side metal components, the position of the one end portion in the optical axis direction is different from the position of the other end portion in the optical axis direction, the plurality of shape memory alloy wires include four shape memory alloy wires, each of which is configured on four sides of the lens holding component surrounding the cylindrical portion, the base component having a pair of fixed-side loading surfaces arranged opposite to each other in a diagonal direction across the cylindrical portion when viewed from above along the optical axis direction, and a pair of The fixed-side loading surfaces respectively include a fixed-side upper loading surface and a fixed-side lower loading surface with different height positions in the optical axis direction, the lens holding component includes a pair of movable-side loading surfaces oppositely arranged in another diagonal direction across the cylindrical portion, the pair of movable-side loading surfaces respectively include a movable-side upper loading surface and a movable-side lower loading surface with different height positions in the optical axis direction, a plurality of the fixed-side metal components are respectively mounted on the corresponding fixed-side upper loading surface or the fixed-side lower loading surface, a plurality of the movable-side metal components are respectively mounted on the corresponding movable-side upper loading surface or the movable-side lower loading surface, one end portion of a corresponding one of the plurality of shape memory alloy wires is fixed to the plurality of the fixed-side metal components, and the other end portion of a corresponding one of the plurality of shape memory alloy wires is fixed to the plurality of the movable-side metal components.

[0011] Effects of the Invention

[0012] The above-mentioned lens driving device is easier to assemble than conventional devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a stereogram of the camera module.

[0014] Figure 2 It is an exploded perspective view of the lens driving device.

[0015] Figure 3 It is a three-dimensional view of the lens holding member and the movable-side conductive member.

[0016] Figure 4 It is a top view of the lens holding component.

[0017] Figure 5 It is a bottom view of the lens holding component.

[0018] Figure 6 It is a perspective view of the base member and the fixed-side conductive member.

[0019] Figure 7 is a top view of the base assembly.

[0020] Figure 8 It is a three-dimensional view of a lens holding component, a metal component, a flexible metal component, and a base component.

[0021] Fig. 9 This is a top view of the movable side metal component, the fixed side metal component, and the shape memory alloy wire.

[0022] Fig.10 It is a three-dimensional diagram of a metal component, a flexible metal component, a movable-side conductive component, a fixed-side conductive component, and a shape memory alloy wire.

[0023] Fig.11 FIG. 1 is a diagram showing an example of a path of a current flowing through the first line.

[0024] Fig.12 FIG. 1 is a diagram showing an example of a path of a current flowing through the second line.

[0025] Fig.13 FIG. 1 is a diagram showing an example of a path of a current flowing through the third line.

[0026] Fig.14 FIG. 1 is a diagram showing an example of a path of a current flowing through the fourth line.

[0027] Fig.15 This is a front view of the lens driving device with the cover member removed. DETAILED DESCRIPTION

[0028] Hereinafter, the lens driving device 101 and the camera module CM according to the embodiment of the present disclosure will be described with reference to the drawings. Figure 1 It is a perspective view of the camera module CM. Figure 2 It is an exploded perspective view of the lens driving device 101 .

[0029] exist Figure 1 as well as Figure 2 In , X1 represents one direction of the X axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. In addition, Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. Figure 1 as well as Figure 2In the figure, the X1 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (back side) of the lens driving device 101. In addition, the Y1 side of the lens driving device 101 corresponds to the left side of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the right side of the lens driving device 101. In addition, the Z1 side of the lens driving device 101 corresponds to the upper side (subject side) of the lens driving device 101, and the Z2 side of the lens driving device 101 corresponds to the lower side (photographic element side) of the lens driving device 101. The same is true in other figures.

[0030] Camera module CM Figure 1 As shown, it includes a lens driving device 101, a lens body LS mounted on a lens holding component 2, and an imaging element IS mounted on an external substrate (not shown) in a manner opposite to the lens body LS. The lens body LS is a cylindrical lens barrel including at least one lens and has an optical axis OA. In the example shown in the figure, the lens driving device 101 having a substantially rectangular shape is mounted on an external substrate for mounting the imaging element IS.

[0031] Specifically, the lens driving device 101 is as follows Figure 1 as well as Figure 2 As shown, the cover member 4 and the base member 18 as the fixed-side member FB, and the lens holding member 2 as the movable-side member MB are included.

[0032] In the example shown in the figure, the cover member 4 is formed of a non-magnetic metal. However, the cover member 4 may also be formed of a magnetic metal or a synthetic resin. Figure 1 As shown, it has a bottomless box-like appearance for defining the storage portion 4S.

[0033] More specifically, the cover component 4 has a rectangular cylindrical outer wall portion 4A, and a top plate portion 4B having a rectangular ring-shaped and flat plate-shaped outer shape which is continuously provided with the upper end of the outer wall portion 4A. A circular opening 4K is formed in the center of the top plate portion 4B. The outer wall portion 4A includes a first side plate portion 4A1 to a fourth side plate portion 4A4. The first side plate portion 4A1 and the third side plate portion 4A3 are opposite to each other, and the second side plate portion 4A2 and the fourth side plate portion 4A4 are opposite to each other. Moreover, the first side plate portion 4A1 and the third side plate portion 4A3 extend perpendicularly relative to the second side plate portion 4A2 and the fourth side plate portion 4A4. In addition, the cover component 4 is as Figure 1 As shown, it is joined to the base member 18 by an adhesive or the like.

[0034] The base member 18 is formed by injection molding using a synthetic resin such as a liquid crystal polymer (LCP). Figure 2As shown, the base member 18 has a substantially rectangular outline when viewed from above, and has an opening 18K in the center. Specifically, the base member 18 includes a rectangular ring-shaped base portion 18B arranged so as to surround the circular opening 18K, and a fixed side seat portion 18D formed to extend upward from the base portion 18B along the optical axis OA. The fixed side seat portion 18D includes a first fixed side seat portion 18D1 and a second fixed side seat portion 18D2. The first fixed side seat portion 18D1 and the second fixed side seat portion 18D2 are arranged so as to be located on opposite sides of each other across the optical axis OA.

[0035] The cover member 4 and the base member 18 are configured to function as a frame HS. Figure 2 As shown, the lens holding member 2, the metal member 5, the flexible metal member 6, the shape memory alloy wire SA, etc. are accommodated.

[0036] The lens holding member 2 is formed by injection molding of a synthetic resin such as a liquid crystal polymer (LCP), and is configured to have an opening 2K that penetrates in the vertical direction and can hold the lens body LS. Figure 2 As shown, the lens holding member 2 includes: a cylindrical portion 12 formed to extend along the optical axis OA, and a movable side seat portion 2D and a protruding portion 2S formed to protrude radially outward from the cylindrical portion 12. In the example shown in the figure, the lens body LS is configured to be fixed to the inner peripheral surface of the cylindrical portion 12 by an adhesive. A spiral groove may also be formed on the inner peripheral surface of the cylindrical portion 12 so that the adhesive can be diffused between the inner peripheral surface of the cylindrical portion 12 and the lens body LS.

[0037] The movable side seat portion 2D includes a first movable side seat portion 2D1 and a second movable side seat portion 2D2. The first movable side seat portion 2D1 and the second movable side seat portion 2D2 are configured to be located on opposite sides of each other across the optical axis OA. Similarly, the protruding portion 2S includes a first protruding portion 2S1 and a second protruding portion 2S2. The first protruding portion 2S1 and the second protruding portion 2S2 are configured to be located on opposite sides of each other across the optical axis OA. Specifically, the movable side seat portion 2D and the protruding portion 2S are configured to correspond to the four corners of the lens holding component 2 having a substantially rectangular shape when viewed from above, and are arranged alternately. Moreover, the metal components 5 are respectively placed on the two movable side seats 2D.

[0038] The shape memory alloy wire SA is an example of a shape memory actuator, and constitutes a driving unit DM that drives the movable side member MB. In the example shown in the figure, the shape memory alloy wire SA includes a first wire SA1 to a fourth wire SA4. The shape memory alloy wire SA increases in temperature when current flows, and contracts as its temperature rises. The driving unit DM can use the contraction of the shape memory alloy wire SA to move the lens holding member 2.

[0039] The flexible metal member 6 constitutes a conductive connection member connecting the lens holding member 2 and the base member 18. In the present embodiment, the flexible metal member 6 is made of a metal plate mainly made of, for example, copper alloy, titanium-copper alloy (titanium-copper), or copper-nickel alloy (nickel-tin-copper).

[0040] Specifically, the flexible metal member 6 includes a base fixing portion 6E fixed to the base member 18, a movable fixing portion 6N fixed to the lens holding member 2, and a flexible arm portion 6G connecting the base fixing portion 6E and the movable fixing portion 6N. The base fixing portion 6E includes a first base fixing portion 6E1 and a second base fixing portion 6E2. The flexible arm portion 6G includes a first flexible arm portion 6G1 connecting the first base fixing portion 6E1 and the movable fixing portion 6N, and a second flexible arm portion 6G2 connecting the second base fixing portion 6E2 and the movable fixing portion 6N.

[0041] More specifically, the flexible metal component 6 includes a front flexible metal component 6F and a rear flexible metal component 6B of the same shape. The front flexible metal component 6F includes a first front base fixing portion 6E1F, a second front base fixing portion 6E2F, a front movable fixing portion 6NF, a first front flexible arm portion 6G1F, and a second front flexible arm portion 6G2F. The rear flexible metal component 6B includes a first rear base fixing portion 6E1B, a second rear base fixing portion 6E2B, a rear movable fixing portion 6NB, a first rear flexible arm portion 6G1B, and a second rear flexible arm portion 6G2B.

[0042] The metal component 5 is configured to fix the end of the shape memory alloy wire SA. In the present embodiment, the metal component 5 is formed of a non-magnetic metal and includes a fixed side metal component 5F and a movable side metal component 5M. The fixed side metal component 5F is configured to be fixed to the fixed side seat portion 18D of the base component 18. The movable side metal component 5M is configured to be fixed to the movable side seat portion 2D of the lens holding component 2.

[0043] More specifically, the fixed side metal component 5F is also called a fixed side connection plate, and includes a first fixed side connection plate 5F1 to a fourth fixed side connection plate 5F4. The movable side metal component 5M is also called a movable side connection plate, and includes a first movable side connection plate 5M1 to a fourth movable side connection plate 5M4.

[0044] One end of each of the first wire SA1 to the fourth wire SA4 is fixed to the fixed-side metal member 5F by crimping or welding, etc., and the other end is fixed to the movable-side metal member 5M by crimping or welding, etc. Moreover, each of the first wire SA1 to the fourth wire SA4 is configured so as to extend along the inner surface of the outer peripheral wall portion 4A of the cover member 4 when current flows therethrough, and supports the movable-side member MB so as to be movable relative to the fixed-side member FB.

[0045] Next, refer to Figure 3 to Figure 5 , the lens holding member 2 as the movable side member MB will be described in detail. Figure 3 It is a perspective view of the lens holding member 2 and the movable-side conductive member MC embedded in the lens holding member 2 . Figure 4 2 is a top view of the lens holding member 2 in which the movable side conductive member MC is embedded. Specifically, Figure 4 The upper figure is a top view of the lens holding component 2 in a state where the movable side metal component 5M is not installed. Figure 4 The lower figure is a top view of the lens holding component 2 in a state where the movable-side metal component 5M is mounted. Figure 5 2 is a bottom view of the lens holding member 2 in which the movable side conductive member MC is embedded. Specifically, Figure 5 The upper figure is a bottom view of the lens holding component 2 in a state where the flexible metal component 6 is not installed. Figure 5 The lower figure is a bottom view of the lens holding component 2 with the flexible metal component 6 installed. Figure 3 to Figure 5 In the figure, for the sake of clarity, a dense dot pattern is added to the movable side conductive component MC. Figure 4 In the figure below, for the sake of clarity, a sparse dot pattern is added to the movable side metal part 5M. Figure 5 In the lower figure, a sparse dot pattern is added to the flexible metal part 6 for clarity.

[0046] like Figure 3 As shown, a movable side mounting surface MS for mounting a movable side metal component 5M is formed on the movable side seat portion 2D of the lens holding component 2. In addition, a movable side conductive component MC is embedded in the movable side seat portion 2D of the lens holding component 2 by insert molding. In the present embodiment, the movable side conductive component MC is formed of a magnetic metal such as iron, and includes a first movable side conductive component MC1 embedded in the first movable side seat portion 2D1 and a second movable side conductive component MC2 embedded in the second movable side seat portion 2D2. In addition, the movable side conductive component MC is configured to have a first portion ES1 and a second portion ES2 exposed on the movable side mounting surface MS, and a third portion ES3 exposed on the lower surface (the surface on the Z2 side) of the lens holding component 2. Specifically, the first movable conductive member MC1 includes a first front portion ES1F, a second front portion ES2F, and a third front portion ES3F, and the second movable conductive member MC2 includes a first rear portion ES1B, a second rear portion ES2B, and a third rear portion ES3B.

[0047] In the example shown in the figure, the movable side metal member 5M is as follows Figure 4As shown in the figure below, the movable side loading surface MS is fixed to the movable side seat part 2D. Specifically, the movable side loading surface MS is formed as a plane facing upward (Z1 direction), and includes a first movable side loading surface MS1 formed on the first movable side seat part 2D1 and a second movable side loading surface MS2 formed on the second movable side seat part 2D2. Moreover, the first movable side loading surface MS1 includes a first movable side upper loading surface MS1U and a first movable side lower loading surface MS1D, and the second movable side loading surface MS2 includes a second movable side upper loading surface MS2U and a second movable side lower loading surface MS2D. The first movable side upper loading surface MS1U is arranged at a position higher than the first movable side lower loading surface MS1D in the Z-axis direction. Similarly, the second movable side upper loading surface MS2U is arranged at a position higher than the second movable side lower loading surface MS2D in the Z-axis direction. In the example shown in the figure, the first movable side upper loading surface MS1U and the second movable side upper loading surface MS2U are arranged at the same position (height) in the Z-axis direction, and the first movable side lower loading surface MS1D and the second movable side lower loading surface MS2D are arranged at the same position (height) in the Z-axis direction. In addition, the first movable side upper loading surface MS1U, the second movable side upper loading surface MS2U, the first movable side lower loading surface MS1D, and the second movable side lower loading surface MS2D are arranged to be perpendicular to the optical axis OA. However, the first movable side upper loading surface MS1U and the second movable side upper loading surface MS2U may be arranged at different positions (heights) in the Z-axis direction, and the first movable side lower loading surface MS1D and the second movable side lower loading surface MS2D may be arranged at different positions (heights) in the Z-axis direction.

[0048] Specifically, if Figure 4 As shown in the figure below, the movable side metal member 5M is formed with two cylindrical protrusions 2P (see Figure 3 ) are inserted into two first through holes 5H1. In the example shown in the figure, the lens holding component 2 and the movable side metal component 5M are respectively joined by performing hot riveting or cold riveting on the two protrusions 2P inserted into the two first through holes 5H1. However, the joining of the lens holding component 2 and the movable side metal component 5M can also be achieved by an adhesive.

[0049] In addition, if Figure 4As shown in the following figure, a second through hole 5H2 is formed in the central portion of each movable side metal component 5M. The second through hole 5H2 is used when each movable side metal component 5M is joined to the movable side conductive component MC. In the example shown in the figure, the joining of each movable side metal component 5M to the movable side conductive component MC is achieved by laser welding. However, the joining of each movable side metal component 5M to the movable side conductive component MC can also be achieved by solder or conductive adhesive.

[0050] More specifically, the first movable side connection plate 5M1 is placed and joined on the first movable side upper mounting surface MS1U which is a part of the first movable side mounting surface MS1 formed on the first movable side seat portion 2D1, and is joined to the first front side portion ES1F of the first movable side conductive member MC1 exposed on the first movable side upper mounting surface MS1U. In addition, the second movable side connection plate 5M2 is placed and joined on the second movable side lower mounting surface MS2D which is a part of the second movable side mounting surface MS2 formed on the second movable side seat portion 2D2, and is joined to the second rear side portion ES2B of the second movable side conductive member MC2 exposed on the second movable side lower mounting surface MS2D. The third movable side connection plate 5M3 is placed and joined on the second movable side upper mounting surface MS2U which is a part of the second movable side mounting surface MS2 formed on the second movable side seat portion 2D2, and is joined to the first rear side portion ES1B of the second movable side conductive member MC2 exposed on the second movable side upper mounting surface MS2U. The fourth movable side connection plate 5M4 is placed and joined on the first movable side lower mounting surface MS1D which is a part of the first movable side mounting surface MS1 formed on the first movable side seat portion 2D1, and is joined to the second front side portion ES2F of the first movable side conductive member MC1 exposed on the first movable side lower mounting surface MS1D.

[0051] like Figure 5 As shown in the following figure, the first through hole 6H1 and the second through hole 6H2 are formed in the first base fixing part 6E1, the second base fixing part 6E2 and the movable fixing part 6N of the flexible metal component 6. The first through hole 6H1 is formed to connect the flexible metal component 6 with the movable side conductive component MC embedded in the lens holding component 2 or the fixed side conductive component FC embedded in the base component 18 (refer to Figure 6) is utilized when joining. In the example shown in the figure, the joining of the flexible metal component 6 and the movable side conductive component MC or the fixed side conductive component FC is achieved by laser welding. The joining of the flexible metal component 6 to the movable side conductive component MC and the fixed side conductive component FC can also be achieved by solder or a conductive adhesive. The second through hole 6H2 is utilized when joining the flexible metal component 6 to the lens holding component 2 or the base component 18. In the example shown in the figure, the joining of the flexible metal component 6 and the lens holding component 2 or the base component 18 is achieved by hot riveting or cold riveting the protrusion 2Q or the protrusion 18Q inserted into the second through hole 6H2. In the example shown in the figure, the protrusion 2Q is as Figure 5 As shown in the figure above, it is a cylindrical part formed to protrude downward from the lower surface of the lens holding member 2. In addition, the convex portion 18Q is as shown in FIG. Figure 2 As shown, it is a cylindrical portion formed to protrude upward from the upper surface of the base member 18. However, the joining of the flexible metal member 6 and the lens holding member 2 or the base member 18 may be achieved by an adhesive.

[0052] Specifically, if Figure 5 As shown in the following figure, the joining (welding) of the front movable fixing portion 6NF of the front flexible metal component 6F and the third front portion ES3F of the first movable conductive component MC1 is achieved by irradiating the first through hole 6H1 with a laser. In addition, the joining of the lens holding component 2 and the front movable fixing portion 6NF of the front flexible metal component 6F is achieved by hot riveting or cold riveting the convex portion 2Q inserted into the second through hole 6H2. Similarly, the joining (welding) of the rear movable fixing portion 6NB of the rear flexible metal component 6B and the third rear portion ES3B of the second movable conductive component MC2 is achieved by irradiating the first through hole 6H1 with a laser. In addition, the joining of the lens holding component 2 and the rear movable fixing portion 6NB of the rear flexible metal component 6B is achieved by hot riveting or cold riveting the convex portion 2Q inserted into the second through hole 6H2.

[0053] Next, refer to Figure 6 as well as Figure 7 , the base member 18 serving as the fixed-side member FB will be described in detail. Figure 6 It is a perspective view of the base member 18 and the fixed-side conductive member FC embedded in the base member 18 . Figure 7 1 is a top view of the base member 18 in which the fixed-side conductive member FC is embedded. Specifically, Figure 7 The upper figure is a top view of the base member 18 in a state where the fixed side metal member 5F and the flexible metal member 6 are not installed. Figure 7 The lower figure is a top view of the base member 18 with the fixed side metal member 5F and the flexible metal member 6 installed. Figure 6 as well as Figure 7 In the figure, for the sake of clarity, a dense dot pattern is added to the fixed side conductive component FC. Figure 7 In the lower figure, for the sake of clarity, a sparse dot pattern is added to the fixed-side metal component 5F and the flexible metal component 6.

[0054] like Figure 6 As shown, a fixed side mounting surface FS for mounting the fixed side metal component 5F is formed on the fixed side seat portion 18D of the base member 18. In addition, a part of the fixed side conductive component FC is embedded by insert molding in the fixed side seat portion 18D of the base member 18. In this embodiment, the fixed side conductive component FC is formed of a magnetic metal such as iron.

[0055] In addition, the fixed-side conductive component FC is configured to have a joint surface CS exposed on the upper surface (surface on the Z1 side) of the base component 18 and a terminal portion TM protruding from the lower surface (surface on the Z2 side) of the base component 18 and extending downward (in the Z2 direction). Specifically, the fixed-side conductive component FC includes a first fixed-side conductive component FC1 to a sixth fixed-side conductive component FC6. In addition, the first fixed-side conductive component FC1 includes a first terminal portion TM1 and a first joint surface CS1, the second fixed-side conductive component FC2 includes a second terminal portion TM2 and a second joint surface CS2, the third fixed-side conductive component FC3 includes a third terminal portion TM3 and a third joint surface CS3, the fourth fixed-side conductive component FC4 includes a fourth terminal portion TM4 and a fourth joint surface CS4, the fifth fixed-side conductive component FC5 includes a fifth terminal portion TM5 and a fifth joint surface CS5, and the sixth fixed-side conductive component FC6 includes a sixth terminal portion TM6 and a sixth joint surface CS6.

[0056] In the example shown in the figure, the fixed side metal component 5F is as follows Figure 7As shown in the following figure, the fixed side loading surface FS is fixed to the fixed side seat portion 18D. Specifically, the fixed side loading surface FS is formed as a plane facing upward (Z1 direction), and includes a first fixed side loading surface FS1 formed on the first fixed side seat portion 18D1 and a second fixed side loading surface FS2 formed on the second fixed side seat portion 18D2. Moreover, the first fixed side loading surface FS1 includes a first fixed side upper loading surface FS1U and a first fixed side lower loading surface FS1D, and the second fixed side loading surface FS2 includes a second fixed side upper loading surface FS2U and a second fixed side lower loading surface FS2D. The first fixed side upper loading surface FS1U is arranged at a position higher than the first fixed side lower loading surface FS1D in the Z-axis direction. Similarly, the second fixed side upper loading surface FS2U is arranged at a position higher than the second fixed side lower loading surface FS2D in the Z-axis direction. In the example shown in the figure, the first fixed-side upper loading surface FS1U and the second fixed-side upper loading surface FS2U are arranged at the same position (height) in the Z-axis direction, and the first fixed-side lower loading surface FS1D and the second fixed-side lower loading surface FS2D are arranged at the same position (height) in the Z-axis direction. In addition, the first fixed-side upper loading surface FS1U, the second fixed-side upper loading surface FS2U, the first fixed-side lower loading surface FS1D, and the second fixed-side lower loading surface FS2D are arranged to be perpendicular to the optical axis OA. However, the first fixed-side upper loading surface FS1U and the second fixed-side upper loading surface FS2U may be arranged at different positions (heights) in the Z-axis direction, and the first fixed-side lower loading surface FS1D and the second fixed-side lower loading surface FS2D may be arranged at different positions (heights) in the Z-axis direction.

[0057] In addition, the first fixed-side upper loading surface FS1U, the second fixed-side upper loading surface FS2U, the first fixed-side lower loading surface FS1D, the second fixed-side lower loading surface FS2D, the first movable-side upper loading surface MS1U, the second movable-side upper loading surface MS2U, the first movable-side lower loading surface MS1D, and the second movable-side lower loading surface MS2D may be arranged to be parallel to the corresponding shape memory alloy wire SA. Specifically, the first fixed-side lower loading surface FS1D and the first movable-side upper loading surface MS1U may be arranged to be parallel to the first wire SA1 arranged between the first fixed-side connection board 5F1 and the first movable-side connection board 5M1. In addition, the first fixed-side upper loading surface FS1U and the second movable-side lower loading surface MS2D may be arranged to be parallel to the second wire SA2 arranged between the second fixed-side connection board 5F2 and the second movable-side connection board 5M2. Furthermore, the second fixed-side lower mounting surface FS2D and the second movable-side upper mounting surface MS2U may be arranged in parallel with a third line SA3 arranged between the third fixed-side terminal plate 5F3 and the third movable-side terminal plate 5M3. Furthermore, the second fixed-side upper mounting surface FS2U and the first movable-side lower mounting surface MS1D may be arranged in parallel with a fourth line SA4 arranged between the fourth fixed-side terminal plate 5F4 and the fourth movable-side terminal plate 5M4.

[0058] Specifically, if Figure 7 As shown in the following figure, the fixed side metal member 5F is formed with two cylindrical protrusions 18P (see Figure 6 ) are inserted into two first through holes 5H1. In the illustrated example, the base member 18 and the fixed side metal member 5F are joined by hot riveting or cold riveting the two protrusions 18P inserted into the two first through holes 5H1. However, the base member 18 and the fixed side metal member 5F may also be joined by an adhesive.

[0059] In addition, if Figure 7 As shown in the following figure, a second through hole 5H2 is formed in the central portion of each fixed side metal component 5F. The second through hole 5H2 is used when each fixed side metal component 5F is joined to the fixed side conductive component FC. In the example shown in the figure, the joining of each fixed side metal component 5F to the fixed side conductive component FC is achieved by laser welding. However, the joining of each fixed side metal component 5F to the fixed side conductive component FC can also be achieved by solder or conductive adhesive.

[0060] More specifically, the first fixed-side terminal plate 5F1 is placed and joined on the first fixed-side lower mounting surface FS1D which is a part of the first fixed-side mounting surface FS1 formed on the first fixed-side seat portion 18D1, and is joined to the first joint surface portion CS1 of the first fixed-side conductive member FC1 exposed on the first fixed-side lower mounting surface FS1D. In addition, the second fixed-side terminal plate 5F2 is placed and joined on the first fixed-side upper mounting surface FS1U which is a part of the first fixed-side mounting surface FS1 formed on the first fixed-side seat portion 18D1, and is joined to the second joint surface portion CS2 of the second fixed-side conductive member FC2 exposed on the first fixed-side upper mounting surface FS1U. In addition, the third fixed-side terminal plate 5F3 is placed and joined on the second fixed-side lower mounting surface FS2D which is a part of the second fixed-side mounting surface FS2 formed on the second fixed-side seat portion 18D2, and is joined to the third joint surface portion CS3 of the third fixed-side conductive member FC3 exposed on the second fixed-side lower mounting surface FS2D. In addition, the fourth fixed side terminal plate 5F4 is placed and joined on a part of the second fixed side loading surface FS2 formed on the second fixed side base portion 18D2, namely, the second fixed side upper loading surface FS2U, and is joined to the fourth joining surface CS4 of the fourth fixed side conductive component FC4 exposed on the second fixed side upper loading surface FS2U.

[0061] In addition, if Figure 7 As shown in the following figure, the joining of the base component 18 and the first front base fixing portion 6E1F of the front flexible metal component 6F is achieved by hot riveting or cold riveting the convex portion 18Q inserted into the second through hole 6H2. In addition, the joining (welding) of the second front base fixing portion 6E2F of the front flexible metal component 6F and the fifth joint surface CS5 of the fifth fixed side conductive component FC5 is achieved by irradiating the first through hole 6H1 with a laser. In addition, the joining of the base component 18 and the second front base fixing portion 6E2F of the front flexible metal component 6F is achieved by hot riveting or cold riveting the convex portion 18Q inserted into the second through hole 6H2. Similarly, the joining (welding) of the first rear base fixing portion 6E1B of the rear flexible metal component 6B and the sixth joint surface CS6 of the sixth fixed side conductive component FC6 is achieved by irradiating the first through hole 6H1 with a laser. The base member 18 is joined to the first rear base fixing portion 6E1B of the rear flexible metal member 6B by hot caulking or cold caulking the convex portion 18Q inserted through the second through hole 6H2. The base member 18 is joined to the second rear base fixing portion 6E2B of the rear flexible metal member 6B by hot caulking or cold caulking the convex portion 18Q inserted through the second through hole 6H2.

[0062] Next, refer to Figure 8, the positional relationship between each of the lens holding member 2 and the base member 18 and each of the metal member 5 and the flexible metal member 6 will be described. Figure 8 The upper figure is a perspective view of the lens holding component 2 to which the movable-side metal component 5M and the flexible metal component 6 are attached. Figure 8 The lower figure is a perspective view of the base member 18 to which the fixed side metal member 5F and the flexible metal member 6 are installed. Figure 8 In addition, Figure 8 In the figure, for the sake of clarity, a sparse dot pattern is added to the metal component 5 and the flexible metal component 6.

[0063] like Figure 8 As shown, it is mounted on the fixed side upper mounting surface FSU (refer to Figure 6 ) is configured such that a shape memory alloy wire SA (see Figure 2 ) is connected to the movable side lower mounting surface MSD (refer to Figure 3 ) of the movable side metal member 5M. On the contrary, the fixed side lower mounting surface FSD (refer to Figure 6 ) is configured such that the fixed side metal member 5F is connected to the other side of the lens driving device 101 via another shape memory alloy wire SA (see Figure 2 ) is connected to the movable upper mounting surface MSU (see Figure 3 )'s movable side metal part 5M.

[0064] Specifically, the first fixed side lower mounting surface FS1D (see Figure 6 ) is connected to the first fixed side wiring board 5F1 in front of the lens driving device 101 via the first line SA1 (refer to Figure 2 ) is connected to the first movable side upper mounting surface MS1U (refer to Figure 3). Similarly, the second fixed-side terminal board 5F2 installed on the first fixed-side upper loading surface FS1U which is a relatively high position is connected to the second movable-side terminal board 5M2 installed on the second movable-side lower loading surface MS2D which is a relatively low position via the second line SA2 on the left side surface of the lens driving device 101. In addition, the third fixed-side terminal board 5F3 installed on the second fixed-side lower loading surface FS2D which is a relatively low position is connected to the third movable-side terminal board 5M3 installed on the second movable-side upper loading surface MS2U which is a relatively high position via the third line SA3 on the back of the lens driving device 101. In addition, the fourth fixed-side terminal board 5F4 installed on the second fixed-side upper loading surface FS2U which is a relatively high position is connected to the fourth movable-side terminal board 5M4 installed on the first movable-side lower loading surface MS1D which is a relatively low position via the fourth line SA4 on the right side surface of the lens driving device 101.

[0065] Next, refer to Fig. 9 , the shape memory alloy wire SA attached to the metal member 5 will be described. Fig. 9 This is a diagram of the first wire SA1 attached to the first movable-side terminal plate 5M1 and the first fixed-side terminal plate 5F1, respectively, as viewed from the Z1 side. Fig. 9 The positional relationship of the components shown corresponds to the positional relationship when the lens driving device 101 is assembled and the shape memory alloy wire SA is supplied with current. Fig. 9 For the sake of clarity, other components are omitted. Fig. 9 The following description relates to the first line SA1 , but is also applicable to the second line SA2 to the fourth line SA4 .

[0066] Specifically, one end of the first wire SA1 is fixed to the first fixed-side terminal plate 5F1 at the holding portion J1 of the first fixed-side terminal plate 5F1, and the other end of the first wire SA1 is fixed to the first movable-side terminal plate 5M1 at the holding portion J2 of the first movable-side terminal plate 5M1.

[0067] The holding portion J1 is formed by bending a portion of the first fixed side connection plate 5F1. Specifically, the holding portion J1 is formed by bending a portion of the first fixed side connection plate 5F1 so as to clamp the end (one end) of the first wire SA1. The end (one end) of the first wire SA1 is fixed to the holding portion J1 by welding. The same is true for the holding portion J2.

[0068] Thus, one end of the first wire SA1 to the fourth wire SA4 is fixed to the first fixed side connection board 5F1 to the fourth fixed side connection board 5F4, respectively, and the other end of the first wire SA1 to the fourth wire SA4 is fixed to the first movable side connection board 5M1 to the fourth movable side connection board 5M4, respectively. Moreover, the base member 18 to which the first fixed side connection board 5F1 to the fourth fixed side connection board 5F4 is mounted is configured to function as a wire support member, and the lens holding member 2 to which the first movable side connection board 5M1 to the fourth movable side connection board 5M4 is mounted is configured to function as a movable side member MB. According to this configuration, the lens holding member 2 is supported by the first wire SA1 to the fourth wire SA4 and the base member 18 in a state in which it can move at least in the direction parallel to the optical axis OA, that is, in the Z-axis direction.

[0069] Next, refer to Figure 10 to Figure 14 , the path of the current flowing through the shape memory alloy wire SA is described. Fig.10 It is a three-dimensional diagram of the metal component 5 (the first fixed side terminal board 5F1 to the fourth fixed side terminal board 5F4 and the first movable side terminal board 5M1 to the fourth movable side terminal board 5M4), the flexible metal component 6 (the rear side flexible metal component 6B and the front side flexible metal component 6F), the movable side conductive component MC (the first movable side conductive component MC1 and the second movable side conductive component MC2), the fixed side conductive component FC (the first fixed side conductive component FC1 to the sixth fixed side conductive component FC6), and the shape memory alloy wire SA (the first wire SA1 to the fourth wire SA4), showing the positional relationship among the metal component 5, the flexible metal component 6, the movable side conductive component MC, the fixed side conductive component FC and the shape memory alloy wire SA. Figure 11 to Figure 14 They are Fig.10 Specifically, Fig.11 is a perspective view of a portion related to the first line SA1, Fig.12 is a stereogram of a portion related to the second line SA2, Fig.13 is a stereogram of a portion related to the third line SA3, Fig.14 It is a stereoscopic view of a portion related to the fourth line SA4.

[0070] Specifically, Fig.11 FIG. 2 shows an example of a path of a current flowing through the first line SA1 when the first fixed-side conductive component FC1 is connected to a high potential and the fifth fixed-side conductive component FC5 is connected to a low potential. If the first fixed-side conductive component FC1 is connected to a high potential and the fifth fixed-side conductive component FC5 is connected to a low potential, the current Fig.11As shown by the arrow, the current flows to the fifth fixed side conductive component FC5 through the first fixed side conductive component FC1, the first fixed side terminal plate 5F1, the first wire SA1, the first movable side terminal plate 5M1, the first movable side conductive component MC1 and the front side flexible metal component 6F (the front side movable fixed part 6NF and the second front side base fixed part 6E2F).

[0071] in addition, Fig.12 FIG. 2 shows an example of a path of a current flowing through the second line SA2 when the second fixed-side conductive component FC2 is connected to a high potential and the sixth fixed-side conductive component FC6 is connected to a low potential. If the second fixed-side conductive component FC2 is connected to a high potential and the sixth fixed-side conductive component FC6 is connected to a low potential, the current Fig.12 As shown by the arrow, it flows to the sixth fixed side conductive component FC6 through the second fixed side conductive component FC2, the second fixed side terminal plate 5F2, the second wire SA2, the second movable side terminal plate 5M2, the second movable side conductive component MC2 and the rear side flexible metal component 6B (the rear side movable fixed part 6NB and the first rear side base fixed part 6E1B).

[0072] in addition, Fig.13 FIG. 2 shows an example of a path of a current flowing through the third line SA3 when the third fixed-side conductive component FC3 is connected to a high potential and the sixth fixed-side conductive component FC6 is connected to a low potential. If the third fixed-side conductive component FC3 is connected to a high potential and the sixth fixed-side conductive component FC6 is connected to a low potential, the current is as follows: Fig.13 As shown by the arrow, it flows to the sixth fixed side conductive component FC6 through the third fixed side conductive component FC3, the third fixed side terminal plate 5F3, the third wire SA3, the third movable side terminal plate 5M3, the second movable side conductive component MC2 and the rear side flexible metal component 6B (the rear side movable fixed part 6NB and the first rear side base fixed part 6E1B).

[0073] in addition, Fig.14 FIG. 2 shows an example of a path of a current flowing through the fourth line SA4 when the fourth fixed-side conductive component FC4 is connected to a high potential and the fifth fixed-side conductive component FC5 is connected to a low potential. If the fourth fixed-side conductive component FC4 is connected to a high potential and the fifth fixed-side conductive component FC5 is connected to a low potential, the current Fig.14 As shown by the arrow, it flows to the fifth fixed side conductive component FC5 through the fourth fixed side conductive component FC4, the fourth fixed side terminal plate 5F4, the fourth wire SA4, the fourth movable side terminal plate 5M4, the first movable side conductive component MC1 and the front side flexible metal component 6F (the front side movable fixed part 6NF and the second front side base fixed part 6E2F).

[0074] In the example shown in the figure, two members connected to the low potential are provided (the fifth fixed-side conductive member FC5 and the sixth fixed-side conductive member FC6), but these two members may be integrated. That is, the low potential may be connected to a common member.

[0075] The control device not shown in the figure located outside the lens driving device 101 as described above can independently control the contraction of each of the first line SA1 to the fourth line SA4 by controlling the voltage applied to each of the first fixed side conductive component FC1 to the sixth fixed side conductive component FC6. In addition, the control device can also be configured in the lens driving device 101. In addition, the control device can also be a component of the lens driving device 101.

[0076] For example, the control device may also use the driving force in the direction parallel to the optical axis OA caused by the contraction of the shape memory alloy wire SA as the driving part DM to move the lens holding component 2 in the direction parallel to the optical axis OA on the Z1 side (subject side) of the imaging element IS. Then, by moving the lens holding component 2 in this way, the control device may realize the automatic focus adjustment function as one of the lens adjustment functions. Specifically, the control device may also move the lens holding component 2 in the direction away from the imaging element IS so as to enable macro photography, and move the lens holding component 2 in the direction close to the imaging element IS so as to enable infinite photography. Alternatively, the control device may also use the driving force in the direction perpendicular to the optical axis OA caused by the contraction of the shape memory alloy wire SA as the driving part DM to move the lens holding component 2 in the direction perpendicular to the optical axis OA on the Z1 side (subject side) of the imaging element IS. Then, by moving the lens holding component 2 in this way, the control device may realize the hand shake correction function as one of the lens adjustment functions.

[0077] As described above, the lens driving device 101 according to the embodiment of the present disclosure is Figure 2As shown, it comprises: a base component 18; a lens holding component 2 having a cylindrical portion 12 capable of holding a lens body LS and capable of moving relative to the base component 18; a plurality of fixed side metal components 5F fixed to the base component 18; a plurality of movable side metal components 5M fixed to the lens holding component 2; and a plurality of shape memory alloy wires SA, one end of which is fixed to the corresponding fixed side metal component 5F, and the other end is fixed to the corresponding movable side metal component 5M, and is arranged so that the position of one end in the optical axis direction (Z axis direction) is different from the position of the other end in the optical axis direction. Moreover, the plurality of shape memory alloy wires SA include four shape memory alloy wires SA (first wire SA1 to fourth wire SA4), and the four shape memory alloy wires SA are arranged one each on the four sides (front side, left side side, rear side and right side side) surrounding the cylindrical portion 12 of the lens holding component 2. In addition, the optical axis direction includes the direction of the optical axis OA of the lens body LS and the direction parallel to the optical axis OA.

[0078] The base member 18 has a pair of fixed side mounting surfaces FS (a first fixed side mounting surface FS1 and a second fixed side mounting surface FS2) disposed opposite to each other in a diagonal direction across the cylindrical portion 12 when viewed from above along the optical axis. The pair of fixed side mounting surfaces FS (the first fixed side mounting surface FS1 and the second fixed side mounting surface FS2) are respectively as shown in FIG. Figure 7 As shown in the above figure, it has a fixed side upper loading surface FSU (a first fixed side upper loading surface FS1U and a second fixed side upper loading surface FS2U) and a fixed side lower loading surface FSD (a first fixed side lower loading surface FS1D and a second fixed side lower loading surface FS2D) having different height positions in the optical axis direction.

[0079] The lens holding member 2 has a pair of movable side mounting surfaces MS (a first movable side mounting surface MS1 and a second movable side mounting surface MS2) disposed opposite to each other in another diagonal direction across the cylindrical portion 12. The pair of movable side mounting surfaces MS (the first movable side mounting surface MS1 and the second movable side mounting surface MS2) are respectively as shown in FIG. Figure 4 As shown in the above figure, it has a movable side upper loading surface MSU (a first movable side upper loading surface MS1U and a second movable side upper loading surface MS2U) and a movable side lower loading surface MSD (a first movable side lower loading surface MS1D and a second movable side lower loading surface MS2D) having different height positions in the optical axis direction.

[0080] Furthermore, the plurality of fixed-side metal parts 5F are respectively mounted on the corresponding fixed-side upper mounting surface FSU or the fixed-side lower mounting surface FSD, and the plurality of movable-side metal parts 5M are respectively mounted on the corresponding movable-side upper mounting surface MSU or the movable-side lower mounting surface MSD. In addition, one end of a corresponding one of the plurality of shape memory alloy wires SA is fixed to each of the plurality of fixed-side metal parts 5F, and the other end of a corresponding one of the plurality of shape memory alloy wires SA is fixed to each of the plurality of movable-side metal parts 5M.

[0081] In the example shown in the figure, the fixed side metal component 5F includes the first fixed side connection board 5F1 to the fourth fixed side connection board 5F4. The first fixed side connection board 5F1 is mounted on the first fixed side lower mounting surface FS1D, the second fixed side connection board 5F2 is mounted on the first fixed side upper mounting surface FS1U, the third fixed side connection board 5F3 is mounted on the second fixed side lower mounting surface FS2D, and the fourth fixed side connection board 5F4 is mounted on the second fixed side upper mounting surface FS2U. In addition, the movable side metal component 5M includes the first movable side connection board 5M1 to the fourth movable side connection board 5M4. Moreover, the first movable side terminal board 5M1 is installed on the first movable side upper loading surface MS1U, the second movable side terminal board 5M2 is installed on the second movable side lower loading surface MS2D, the third movable side terminal board 5M3 is installed on the second movable side upper loading surface MS2U, and the fourth movable side terminal board 5M4 is installed on the first movable side lower loading surface MS1D.

[0082] In addition, the shape memory alloy wire SA includes a first wire SA1 to a fourth wire SA4. Moreover, one end of the first wire SA1 is fixed to the first fixed side terminal plate 5F1, and the other end is fixed to the first movable side terminal plate 5M1. One end of the second wire SA2 is fixed to the second fixed side terminal plate 5F2, and the other end is fixed to the second movable side terminal plate 5M2. One end of the third wire SA3 is fixed to the third fixed side terminal plate 5F3, and the other end is fixed to the third movable side terminal plate 5M3. One end of the fourth wire SA4 is fixed to the fourth fixed side terminal plate 5F4, and the other end is fixed to the fourth movable side terminal plate 5M4.

[0083] In the above-mentioned structure, the fixed side metal component 5F and the movable side metal component 5M are respectively installed only from the upper side (Z1 side). Therefore, the above-mentioned structure brings about the effect of improving the productivity (assembly) of the lens driving device 101 compared with the structure in which the lens driving device 101 is installed from four sides (front side (X1 side), left side (Y1 side), rear side (X2 side) and right side (Y2 side)). That is, the above-mentioned lens driving device 101 is easier to assemble than the previous structure. In addition, the above-mentioned structure brings about the effect of improving the assembly accuracy of the lens driving device 101.

[0084] In addition, if Figure 3 As shown, a metal movable side conductive component MC connected to the movable side metal component 5M may be embedded in the lens holding component 2. In addition, in the example shown in the figure, the movable side conductive component MC includes a first movable side conductive component MC1 and a second movable side conductive component MC2, but the first movable side conductive component MC1 and the second movable side conductive component MC2 may also be integrated.

[0085] This configuration has the effect of simplifying the structure of the movable-side metal member 5M, compared with a configuration in which the movable-side conductive member MC is not embedded in the lens holding member 2. This is because, in this configuration, the movable-side metal member 5M can be relatively easily fixed and electrically connected to the movable-side conductive member MC by welding or the like, compared with a configuration in which the movable-side conductive member MC is not embedded in the lens holding member 2.

[0086] In addition, if Figure 3 As shown, the first part ES1 and the second part ES2 of the movable conductive member MC may be exposed respectively on the movable upper mounting surface MSU and the movable lower mounting surface MSD arranged adjacent to each other in a plan view. Furthermore, a corresponding one of the plurality of movable metal members 5M may be connected to each of the first part ES1 and the second part ES2.

[0087] This configuration has the effect of reducing the number of components compared to the case where the movable side upper mounting surface MSU and the movable side lower mounting surface MSD are arranged separately from each other. This is because the movable side conductive component MC can be composed of two or less components, and because one movable side conductive component MC can be associated with a plurality of movable side metal components 5M. Figure 4 As shown, the first movable-side conductive member MC1 corresponds to the first movable-side terminal plate 5M1 and the fourth movable-side terminal plate 5M4, and the second movable-side conductive member MC2 corresponds to the second movable-side terminal plate 5M2 and the third movable-side terminal plate 5M3.

[0088] In addition, the lens driving device 101 is Figure 2As shown in FIG. 1 , the lens holding member 2 and the base member 18 may be provided with a flexible metal member 6 provided in a manner of connecting the lens holding member 2 and the base member 18. Furthermore, the flexible metal member 6 may include a base fixing portion 6E fixed to the base member 18, a movable fixing portion 6N fixed to the lower surface of the lens holding member 2, and a flexible arm portion 6G disposed between the base fixing portion 6E and the movable fixing portion 6N. In addition, the movable side conductive member MC may be provided as shown in FIG. Figure 5 As shown in the above figure, the third portion ES3 may be exposed on the lower surface of the lens holding member 2. Furthermore, the third portion ES3 may be connected to the movable fixing portion 6N on the lower surface side of the lens holding member 2.

[0089] In this configuration, the flexible metal member 6 is provided on the lower surface side of the lens holding member 2. Therefore, this configuration can suppress the situation where the presence of the flexible metal member 6 affects the attachment of the movable side metal member 5M to the upper surface of the lens holding member 2. In addition, this configuration brings about an effect that it becomes easier to conduct electricity to the shape memory alloy wire SA compared to a case where the flexible metal member 6 is not present.

[0090] In addition, if Figure 6 As shown, a metal fixed-side conductive component FC may be embedded in the base component 18. Furthermore, the fixed-side conductive component FC may have a terminal portion TM exposed outside the base component 18. In addition, a portion of the fixed-side conductive component FC (the first fixed-side conductive component FC1 to the fourth fixed-side conductive component FC4) may be connected to the corresponding fixed-side metal component 5F, and another portion of the fixed-side conductive component FC (the fifth fixed-side conductive component FC5 and the sixth fixed-side conductive component FC6) may be exposed on the upper surface of the base component 18 and connected to the base fixing portion 6E of the flexible metal component 6.

[0091] This configuration brings about an effect of simplifying the structure of the fixed-side metal member 5F compared to a configuration in which the fixed-side conductive member FC is not embedded in the base member 18. In addition, this configuration brings about an effect of facilitating the conduction of electricity to the shape memory alloy wire SA compared to a configuration in which the fixed-side conductive member FC is not embedded in the base member 18. This is because, in this configuration, the fixed-side metal member 5F is relatively easily fixed and electrically connected to the fixed-side conductive member FC by welding or the like compared to a configuration in which the fixed-side conductive member FC is not embedded in the base member 18.

[0092] In addition, four shape memory alloy wires SA (first wire SA1 to fourth wire SA4), one of which is arranged on each of the four sides (front, left, rear and right sides) of the lens holding part 2 surrounding the cylindrical portion 12, can also be arranged to be inclined in the same direction when each of the four sides is observed from the front. Fig.151 is a front view of the lens driving device 101 with the cover member 4 removed, and corresponds to a view when the front surface (the surface on the X1 side) of the lens holding member 2 is viewed from the front (the X1 side). Fig.15 , the first line SA1 is configured such that the left end portion fixed to the first fixed side terminal plate 5F1 is tilted lower than the right end portion fixed to the first movable side terminal plate 5M1. The same is true for the second line SA2 to the fourth line SA4. Although not shown in the figure, when the left side surface (surface on the Y1 side) of the lens holding component 2 is observed from the front (Y1 side), the second line SA2 is configured such that the left end portion fixed to the second movable side terminal plate 5M2 is tilted lower than the right end portion fixed to the second fixed side terminal plate 5F2. Similarly, when the back surface (surface on the X2 side) of the lens holding component 2 is observed from the front (X2 side), the third line SA3 is configured such that the left end portion fixed to the third fixed side terminal plate 5F3 is tilted lower than the right end portion fixed to the third movable side terminal plate 5M3. In addition, when observing the right side surface (surface on the Y2 side) of the lens holding component 2 from the front (Y2 side), the fourth line SA4 is configured so that the left end fixed to the fourth movable side terminal plate 5M4 is tilted lower than the right end fixed to the fourth fixed side terminal plate 5F4.

[0093] In addition, the illustrated example is configured such that the left ends (lower ends) of the first to fourth lines SA1 to SA4 are at the same position (height) in the Z-axis direction, and the right ends (higher ends) of the first to fourth lines SA1 to SA4 are at the same position (height) in the Z-axis direction. However, if the height difference between the left ends (lower ends) and the right ends (higher ends) of the first to fourth lines SA1 to SA4 is the same, the left ends (lower ends) of the first to fourth lines SA1 to SA4 may be at different positions (heights) in the Z-axis direction, and the right ends (higher ends) of the first to fourth lines SA1 to SA4 may be at different positions (heights) in the Z-axis direction.

[0094] In the lens driving device 101, the fixed side metal member 5F (see Figure 7 The second fixed side wiring board 5F2 and the fourth fixed side wiring board 5F4 in the figure below and the movable side metal member 5M fixed to the movable side upper mounting surface MSU (refer to Figure 4 The first movable side connection plate 5M1 and the third movable side connection plate 5M3 in the figure below can also be formed into the same shape. In addition, the fixed side metal member 5F (refer to Figure 7 The first fixed side terminal plate 5F1 and the third fixed side terminal plate 5F3 in the figure below and the movable side metal member 5M fixed to the movable side lower mounting surface MSD (see Figure 4The second movable side terminal plate 5M2 and the fourth movable side terminal plate 5M4 in the lower figure can also be formed into the same shape.

[0095] This structure can reduce the types of components compared to the case where the first fixed side wiring board 5F1 to the fourth fixed side wiring board 5F4 and the first movable side wiring board 5M1 to the fourth movable side wiring board 5M4 are different components. Specifically, this structure can limit the semi-finished product having the fixed side metal component 5F installed at one end of the shape memory alloy wire SA and the movable side metal component 5M installed at the other end to only one type. Therefore, this structure can improve the productivity (assembly) of the lens driving device 101, and further improve mass production.

[0096] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited by the above embodiments. The above embodiments can be applied to various deformations and substitutions without departing from the scope of the present invention. In addition, the features described with reference to the above embodiments can also be appropriately combined as long as they are not technically contradictory.

[0097] Description of Reference Numerals

[0098]

Claims

1. A lens driving device, characterized in that: have: Base components; A lens holding member having a cylindrical portion capable of holding the lens body and capable of moving relative to the base member; A plurality of fixed-side metal parts fixed to the base part; A plurality of movable side metal parts fixed to the lens holding part; as well as a plurality of shape memory alloy wires, wherein one end of the shape memory alloy wire is fixed to the corresponding fixed-side metal component and the other end is fixed to the corresponding movable-side metal component, and the position of the one end in the optical axis direction is different from the position of the other end in the optical axis direction, The plurality of shape memory alloy wires include four shape memory alloy wires, one of which is disposed on each of four surfaces of the lens holding member surrounding the cylindrical portion. The base member has a pair of fixed side mounting surfaces, and the pair of fixed side mounting surfaces are arranged to face each other in a diagonal direction across the cylindrical portion when viewed in a plan view along the optical axis direction. The pair of fixed side mounting surfaces respectively include a fixed side upper mounting surface and a fixed side lower mounting surface at different height positions in the optical axis direction. The lens holding member has a pair of movable side mounting surfaces disposed opposite to each other across the cylindrical portion in another diagonal direction. The pair of movable side mounting surfaces respectively include a movable side upper mounting surface and a movable side lower mounting surface at different height positions in the optical axis direction. The plurality of fixed-side metal parts are respectively mounted on the corresponding fixed-side upper mounting surface or the fixed-side lower mounting surface. The plurality of movable side metal parts are respectively mounted on the corresponding movable side upper mounting surface or the movable side lower mounting surface. The one end portion of a corresponding one of the plurality of shape memory alloy wires is fixed to each of the plurality of fixed-side metal parts. The other end of a corresponding one of the plurality of shape memory alloy wires is fixed to each of the plurality of movable-side metal members.

2. The lens driving device according to claim 1, characterized in that: A metallic movable-side conductive member connected to the movable-side metal member is embedded in the lens holding member.

3. The lens driving device according to claim 2, characterized in that: The movable-side upper mounting surface and the movable-side lower mounting surface, which are arranged adjacent to each other in a plan view, expose the first portion and the second portion of the movable-side conductive member, respectively. A corresponding one of the plurality of movable-side metal members is connected to each of the first portion and the second portion.

4. The lens driving device according to claim 3, characterized in that: A flexible metal member is provided so as to connect the lens holding member and the base member, The flexible metal component has a base fixing portion fixed to the base component, a movable fixing portion fixed to the lower surface of the lens holding component, and a flexible arm portion arranged between the base fixing portion and the movable fixing portion. The movable-side conductive member has a third portion exposed on the lower surface of the lens holding member. The third portion is connected to the movable fixing portion on the lower surface side of the lens holding member.

5. The lens driving device according to claim 4, characterized in that: A metal fixed-side conductive member is embedded in the base member. The fixed-side conductive member has a terminal portion exposed outside the base member, A portion of the fixed-side conductive component is connected to the corresponding fixed-side metal component, Another portion of the fixed-side conductive member is exposed on the upper surface of the base member and is connected to the base fixing portion of the flexible metal member.

6. The lens driving device according to any one of claims 1 to 5, characterized in that: The four shape memory alloy wires, one of which is disposed on each of the four surfaces surrounding the cylindrical portion of the lens holding member, are disposed so as to be inclined in the same direction when each of the four surfaces is viewed from the front.

7. The lens driving device according to any one of claims 1 to 5, characterized in that: The fixed-side metal member fixed to the fixed-side upper mounting surface and the movable-side metal member fixed to the movable-side upper mounting surface are formed in the same shape. The fixed-side metal member fixed to the fixed-side lower mounting surface and the movable-side metal member fixed to the movable-side lower mounting surface are formed in the same shape.

8. A camera module, characterized in that: have: The lens driving device according to any one of claims 1 to 5; the lens body held by the lens holding member; and The imaging element is arranged to face the lens body.

Images