Lens drive device

Abstract

A lens drive device (101) has a first wire (SA1) and a third wire (SA3), and a second wire (SA2) and a fourth wire (SA4) that form pairs with an optical axis (OA) therebetween in the X-axis direction. One end part of the first wire (SA1) is fixed to a first base-side metal member (5F1), the other end part is fixed to a second base-side metal member (5F2), and the intermediate part is fixed to a first central fixing part (CF1). One end part of the second wire (SA2) is fixed to a third base-side metal member (5F3), the other end part is fixed to a fourth base-side metal member (5F F4), and the intermediate part is fixed to a second center fixing part (CF2). In a plan view along the optical axis direction, the first central fixing part (CF1) is disposed between the first base-side metal member (5F1) and the second base-side metal member (5F2), and the second central fixing part (CF2) is disposed between the third base-side metal member (5F3) and the fourth base-side metal member (5F4).

Description

Lens drive unit

[0001] The present disclosure relates to a lens driving device.

[0002] Conventionally, there has been known a camera device (lens driving device) configured to move a camera support (lens holding member) relative to a support structure (base member) using a shape memory alloy wire (see Patent Document 1). In this lens driving device, one end and the other end of the shape memory alloy wire are both fixed to the base member, and an intermediate portion between the one end and the other end is hooked onto a hook provided on the lens holding member.

[0003] International Publication No. 2010 / 089529

[0004] However, in this lens driving device, since the shape memory alloy wire is arranged on the four sides (front, back, left, and right) of the base member, crimp members for fixing both ends of the shape memory alloy wire must be provided on the four sides of the base member, which may make the lens driving device difficult to assemble.

[0005] Therefore, it is desirable to provide a lens driving device that is easier to assemble.

[0006] A lens driving device according to an embodiment of the present disclosure is a lens driving device including a base member, a lens holding member capable of holding a lens body, and a driving unit configured with a shape memory alloy wire that moves the lens holding member along an optical axis direction relative to the base member, wherein the shape memory alloy wire has a first wire and a third wire whose both ends are arranged at positions above a center portion in the optical axis direction, and a second wire and a fourth wire whose both ends are arranged at positions below a center portion in the optical axis direction, and the first wire and the third wire are arranged the second wire and the fourth wire are provided in a pair in the first direction intersecting the optical axis direction, with the optical axis being sandwiched between them; the base member includes a first base-side metal member and a second base-side metal member that are arranged spaced apart in a second direction that intersects the optical axis direction and is substantially perpendicular to the first direction; a third base-side metal member and a fourth base-side metal member that are arranged spaced apart in the second direction; and a fifth base-side metal member and a sixth base-side metal member that are arranged spaced apart in the second direction. , a seventh base-side metal member and an eighth base-side metal member arranged to be spaced apart in the second direction, wherein one end of the first wire is fixed to the first base-side metal member, the other end of the first wire is fixed to the second base-side metal member, and an intermediate portion located between the one end and the other end is fixed to a first central fixing portion provided on the lens holding member, and one end of the second wire is fixed to the third base-side metal member, the other end of the second wire is fixed to the fourth base-side metal member, and an intermediate portion located between the one end and the other end is fixed to a second central fixing portion provided on the lens holding member. the third wire has one end fixed to the fifth base side metal member and the other end fixed to the sixth base side metal member, and an intermediate portion located between the one end and the other end fixed to a third central fixing portion provided on the lens holding member; the fourth wire has one end fixed to the seventh base side metal member and the other end fixed to the eighth base side metal member, and an intermediate portion located between the one end and the other end fixed to a fourth central fixing portion provided on the lens holding member; and in a plan view along the optical axis direction, the first central fixing portion isThe second central fixing portion is disposed between the first base side metal member and the second base side metal member, the second central fixing portion is disposed between the third base side metal member and the fourth base side metal member, the third central fixing portion is disposed between the fifth base side metal member and the sixth base side metal member, and the fourth central fixing portion is disposed between the seventh base side metal member and the eighth base side metal member.

[0007] The lens driving device described above is easy to assemble.

[0008] 10 is a perspective view of a camera module including a lens driving device according to an embodiment of the present disclosure. FIG. 11 is an exploded perspective view of the lens driving device shown in FIG. 1. FIG. 12 is a perspective view of a lens holding member, a lens-side metal member, and a leaf spring. FIG. 13 is a perspective view of a base-side metal member, a leaf spring, a support member, and a base-side embedded member. FIG. 14 is a three-view diagram of a base-side metal member, a lens-side metal member, and a shape memory alloy wire. FIG. 15 is a perspective view of a base-side metal member, a lens-side metal member, a base-side embedded member, and a shape memory alloy wire. FIG. 16 is a perspective view of a base-side metal member, a lens-side metal member, a base-side embedded member, and a shape memory alloy wire. FIG. 17 is a perspective view of a metal member, a leaf spring, a support member, a base-side embedded member, a lower cover member, and a shape memory alloy wire. FIG. 18 is an exploded perspective view of another configuration example of a lens driving device according to an embodiment of the present disclosure. FIG. 19 is a three-view diagram of a base-side metal member, a lens-side metal member, and a shape memory alloy wire that constitute the lens driving device shown in FIG. 19 is a perspective view of a base-side metal member, a lens-side metal member, a base-side embedded member, and a shape memory alloy wire that constitute the lens driving device shown in FIG. 10 is a perspective view of a base-side metal member, a lens-side metal member, a base-side embedded member, and a shape memory alloy wire that constitute the lens driving device shown in FIG. 9 .

[0009] A lens driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view of a camera module CM including the lens driving device 101. Fig. 2 is an exploded perspective view of the lens driving device 101.

[0010] 1 and 2, 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. Furthermore, 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. In FIGS. 1 and 2, the X1 side of the lens driving device 101 corresponds to the front side (front face side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (rear face side) of the lens driving device 101. Furthermore, 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. Furthermore, 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 (image sensor side) of the lens driving device 101. This is the same in the other figures.

[0011] As shown in FIG. 1 , the camera module CM includes a substrate SU, a lens driving device 101, a lens body LS attached to the lens driving device 101, and an image sensor IS mounted on the substrate SU so as to face the lens body LS. The camera module CM is connected to a control device (not shown) that is configured with a microcomputer including a CPU, memory, etc. In the illustrated example, the control device is disposed outside the camera module CM, but it may also be disposed inside the camera module CM. The lens driving device 101, which has a substantially rectangular parallelepiped outer shape, is mounted on the substrate SU on which the image sensor IS is mounted, as shown in FIG.

[0012] Specifically, as shown in Figures 1 and 2, the lens driving device 101 includes an upper cover member 1, which is part of the fixed side member FB, a base member 8, and a lower cover member 10. The upper cover member 1 is configured to function as part of the housing HS of the lens driving device 101. In the illustrated example, the upper cover member 1 is made of a non-magnetic metal. However, the upper cover member 1 may also be made of a magnetic metal. The same applies to the lower cover member 10.

[0013] Specifically, as shown in FIG. 2, the upper cover member 1 has a bottomless box-like outer shape that defines the storage section 1S. Specifically, the upper cover member 1 has a rectangular cylindrical outer wall portion 1A and a rectangular, annular, flat top plate portion 1B that is continuous with the upper end (the end on the Z1 side) of the outer wall portion 1A. A substantially circular opening 1K is formed in the center of the top plate portion 1B. The outer wall portion 1A includes a first side plate portion 1A1 to a fourth side plate portion 1A4. The first side plate portion 1A1 and the third side plate portion 1A3 face each other, and the second side plate portion 1A2 and the fourth side plate portion 1A4 face each other. The first side plate portion 1A1 and the third side plate portion 1A3 extend perpendicular to the second side plate portion 1A2 and the fourth side plate portion 1A4. The upper cover member 1, the base member 8, and the lower cover member 10 are joined together with an adhesive as shown in FIG. 1 to form the housing HS.

[0014] As shown in Figure 2, between the upper cover member 1 and the lower cover member 10, a lens holding member 2, a metal member 5, a leaf spring 6, a base member 8, a base-side embedded member 9, a shape memory alloy wire SA, etc. are housed.

[0015] The lens holding member 2 is a member capable of holding the lens body LS (see FIG. 1) and constitutes the movable member MB. The lens body LS is, for example, a cylindrical lens barrel equipped with at least one lens, and is configured so that its central axis is aligned with the optical axis OA.

[0016] In the illustrated example, the lens holding member 2 is formed by injection molding a synthetic resin such as liquid crystal polymer (LCP). Specifically, as shown in FIG. 2 , the lens holding member 2 includes a cylindrical portion 2C formed to extend along the optical axis OA and a pedestal portion 2D formed to protrude from the cylindrical portion 2C radially outward of a circle centered on the optical axis OA. The pedestal portion 2D is a portion that constitutes the central fixing portion CF and includes a first pedestal portion 2D1 to a fourth pedestal portion 2D4. Specifically, the first pedestal portion 2D1 constitutes the first central fixing portion CF1, the second pedestal portion 2D2 constitutes the second central fixing portion CF2, the third pedestal portion 2D3 constitutes the third central fixing portion CF3, and the fourth pedestal portion 2D4 constitutes the fourth central fixing portion CF4. The combination of the first pedestal portion 2D1 and the second pedestal portion 2D2 and the combination of the third pedestal portion 2D3 and the fourth pedestal portion 2D4 are arranged to protrude in opposite directions in the radial direction (X-axis direction) across the optical axis OA. That is, the combination of the first pedestal portion 2D1 and the second pedestal portion 2D2 protrudes from the cylindrical portion 2C toward the X1 side, while the combination of the third pedestal portion 2D3 and the fourth pedestal portion 2D4 protrudes from the cylindrical portion 2C toward the X2 side. An inner portion 6I of the leaf spring 6 is placed on the upper end of the cylindrical portion 2C. A lens-side metal member 5M is placed on each of the first to fourth pedestals 2D1 to 2D4.

[0017] The driving unit DM is configured to be able to move the movable-side member MB relative to the fixed-side member FB. In the illustrated example, the driving unit DM includes a shape memory alloy wire SA, which is an example of a shape memory actuator. Specifically, the driving unit DM is configured to be able to move the lens holding member 2 relative to the base member 8. The shape memory alloy wire SA includes a first wire SA1 to a fourth wire SA4.

[0018] The shape memory alloy wire SA is configured such that its temperature rises when a current flows through it and it contracts in response to the temperature rise. Specifically, as shown in FIG. 2 , the shape memory alloy wire SA is stretched in a V-shape or an inverted V-shape along the inner surface of the outer wall portion 1A of the upper cover member 1 when a current is supplied thereto, so that the lens holding member 2 can be moved relative to the base member 8. Each of the first wire SA1 to the fourth wire SA4 has one end and the other end fixed to the base-side metal member 5F by crimping, welding, or the like, and an intermediate portion located between the one end and the other end fixed to the lens-side metal member 5M by crimping, welding, or the like. Note that each of the first wire SA1 to the fourth wire SA4 may have one end and the other end fixed directly to the base member 8 (without via the metal member 5). Furthermore, the middle portion of each of the first wire SA1 to fourth wire SA4 may be fixed directly (without the metal member 5) to the central fixing portion CF of the lens holding member 2.

[0019] In the illustrated example, the first wire SA1, the second wire SA2, the third wire SA3, and the fourth wire SA4 are arranged parallel to each other when viewed along the optical axis direction (Z-axis direction). Note that the fact that two shape memory alloy wires are parallel means that a line passing through one end and the other end of one shape memory alloy wire is parallel to a line passing through one end and the other end of the other shape memory alloy wire.

[0020] The drive unit DM can use the contraction of the shape memory alloy wires SA to move the lens holding member 2 up and down along the optical axis direction (Z-axis direction), which is a direction parallel to the optical axis OA. The shape memory alloy wires SA are configured so that when one or more of the first wire SA1 to fourth wire SA4 contract, the lens holding member 2 moves, and this movement causes one or more of the other wires to stretch.

[0021] The metal member 5 is configured so that a portion of the shape memory alloy wire is fixed thereto. In the illustrated example, the metal member 5 is formed of a non-magnetic metal and includes a base-side metal member 5F and a lens-side metal member 5M. The base-side metal member 5F is configured so as to be fixed to the pedestal portion 8D of the base member 8. The lens-side metal member 5M is configured so as to be fixed to the pedestal portion 2D of the lens holding member 2. The base-side metal member 5F may be embedded in the pedestal portion 8D of the base member 8, and the lens-side metal member 5M may be embedded in the pedestal portion 2D of the lens holding member 2.

[0022] More specifically, the base side metal member 5F includes a first base side metal member 5F1 to an eighth base side metal member 5F8, and the lens side metal member 5M includes a first lens side metal member 5M1 to a fourth lens side metal member 5M4.

[0023] The leaf spring 6 is configured to support the lens holding member 2 relative to the base member 8 so that it can move in a direction parallel to the optical axis OA. In this embodiment, the leaf spring 6 is made of a metal plate whose main material is, for example, a copper alloy, a titanium-copper alloy (titanium-copper), or a copper-nickel alloy (nickel-tin-copper). In the illustrated example, the leaf spring 6 connects the lens holding member 2 to the base member 8 so that the center of the lens holding member 2 coincides with the center of the base member 8 when the lens driving device 101 is in a neutral state. In other words, the leaf spring 6 is configured to center the lens holding member 2 relative to the base member 8 in the XY plane. Specifically, the leaf spring 6 is configured to connect the cylindrical portion 2C of the lens holding member 2 to pedestal portions 8D (first pedestal portion 8D1, second pedestal portion 8D2, fifth pedestal portion 8D5, and sixth pedestal portion 8D6) formed on the base member 8. The neutral state of the lens driving device 101 is, for example, a state in which a current is supplied to each of the first wire SA1 to the fourth wire SA4, and the movable member MB (lens holding member 2) is located at the center of the movable range on each of the three mutually orthogonal axes (X-axis, Y-axis, and Z-axis), i.e., a state in which the movable member MB (lens holding member 2) is in the neutral position. Typically, in the neutral state of the lens driving device 101, the lens holding member 2 is located at the center of the movable range on each of the three axes.

[0024] The base member 8 is a member for supporting the movable member MB and constitutes the fixed member FB. In the illustrated example, the base member 8 is formed by injection molding using a synthetic resin such as liquid crystal polymer (LCP). Specifically, the base member 8 has a substantially rectangular outer shape in a plan view (top view) and has a substantially circular opening 8K in the center.

[0025] Specifically, the base member 8 has a rectangular annular base 8B formed to surround the opening 8K, and a pedestal 8D that protrudes upward from the base 8B. The pedestal 8D includes a first pedestal 8D1 to an eighth pedestal 8D8. The combination of the first pedestal 8D1 and the fourth pedestal 8D4 and the combination of the fifth pedestal 8D5 and the eighth pedestal 8D8 are arranged to face each other in the radial direction across the optical axis OA, while the combination of the second pedestal 8D2 and the third pedestal 8D3 and the combination of the sixth pedestal 8D6 and the seventh pedestal 8D7 are arranged to face each other in the radial direction across the optical axis OA. More specifically, the base 8B includes four sides 8E (first side 8E1 to fourth side 8E4), with a first pedestal 8D1 and a fourth pedestal 8D4 provided at the corner between the fourth side 8E4 and the first side 8E1, a second pedestal 8D2 and a third pedestal 8D3 provided at the corner between the first side 8E1 and the second side 8E2, a fifth pedestal 8D5 and an eighth pedestal 8D8 provided at the corner between the second side 8E2 and the third side 8E3, and a sixth pedestal 8D6 and a seventh pedestal 8D7 provided at the corner between the third side 8E3 and the fourth side 8E4. The outer portion 6E of the leaf spring 6 is placed on the first pedestal 8D1, the second pedestal 8D2, the fifth pedestal 8D5, and the sixth pedestal 8D6, respectively. Furthermore, a base side metal member 5F is placed on each of the first to eighth pedestal portions 8D1 to 8D8.

[0026] The base-side embedded member 9 is a metal member embedded in the base member 8. Specifically, the base-side embedded member 9 has a terminal portion used for electrical connection with the outside, and a joining portion exposed on the surface of the base member 8 and used for joining to the metal member 5. In the illustrated example, the base-side embedded member 9 includes a first base-side embedded member 9A to a sixth base-side embedded member 9F, as shown in FIG.

[0027] 4, the first to sixth base-side buried members 9A to 9F have first to sixth terminal portions 9AT to 9FT, respectively, and have first to sixth bonding portions 9AP to 9FP. The first to sixth bonding portions 9AP to 9FP are exposed on the upper surface of the base member 8. The fifth bonding portion 9EP includes a fifth front bonding portion 9EP1 and a fifth rear bonding portion 9EP2, and the sixth bonding portion 9FP includes a sixth front bonding portion 9FP1 and a sixth rear bonding portion 9FP2.

[0028] The lower cover member 10 is a member that constitutes the housing HS in cooperation with the upper cover member 1 and the base member 8. In the illustrated example, the lower cover member 10 is a rectangular, annular, flat metal plate. However, the lower cover member 10 may also be formed from a resin material. The lower cover member 10 may also be embedded in the base member 8 by insert molding or the like. Specifically, the lower cover member 10 has a substantially circular opening 10K in the center.

[0029] Next, the positional relationship between the lens holding member 2 and the members attached to the lens holding member 2 will be described with reference to Fig. 3. Fig. 3 is a top perspective view of the lens holding member 2, the first lens side metal member 5M1 to the fourth lens side metal member 5M4, and the leaf spring 6. Specifically, the upper view of Fig. 3 (the view above the block arrow) is an exploded perspective view, and the lower view of Fig. 3 (the view below the block arrow) is an assembled perspective view.

[0030] In the example shown in the upper diagram of FIG. 3 , the first lens side metal member 5M1 is fixed to the upper surface of the first pedestal portion 2D1. Specifically, the first lens side metal member 5M1 is fixed to the first pedestal portion 2D1 with an adhesive, with a semicircular protrusion 2V formed on the upper surface of the first pedestal portion 2D1 protruding upward (toward the Z1 direction) and a semicircular through-hole RH formed in the first lens side metal member 5M1 engaging with each other. The adhesive is, for example, a photocurable adhesive. The photocurable adhesive is, for example, an ultraviolet-curable adhesive or a visible-light-curable adhesive. Similarly, the second lens side metal member 5M2 is fixed to the upper surface of the second pedestal portion 2D2, the third lens side metal member 5M3 is fixed to the upper surface of the third pedestal portion 2D3, and the fourth lens side metal member 5M4 is fixed to the upper surface of the fourth pedestal portion 2D4.

[0031] The leaf spring 6 has an outer portion 6E fixed to the seat portion 8D (see FIG. 2) of the base member 8, an inner portion 6I fixed to the cylindrical portion 2C of the lens holding member 2, and an elastic portion 6G connecting the outer portion 6E and the inner portion 6I. Specifically, the outer portion 6E includes a first outer portion 6E1 to a fourth outer portion 6E4, the inner portion 6I includes a first inner portion 6I1 and a second inner portion 6I2, and the elastic portion 6G includes a first elastic portion 6G1 to a fourth elastic portion 6G4. The first elastic portion 6G1 connects the first inner portion 6I1 and the first outer portion 6E1, the second elastic portion 6G2 connects the second inner portion 6I2 and the second outer portion 6E2, the third elastic portion 6G3 connects the second inner portion 6I2 and the third outer portion 6E3, and the fourth elastic portion 6G4 connects the first inner portion 6I1 and the fourth outer portion 6E4.

[0032] The first inner portion 6I1 is joined to the cylindrical portion 2C of the lens holding member 2 by adhesive applied to a recess 2R formed in the upper end of the cylindrical portion 2C of the lens holding member 2. The same is true for the second inner portion 6I2. However, joining of the leaf spring 6 and the lens holding member 2 may be achieved by other methods such as caulking.

[0033] Similarly, the first outer portion 6E1 is formed with a first through-hole 6H1 through which a round protrusion 8P (see FIG. 4) formed on the upper surface of the first pedestal 8D1 (see FIG. 4) is inserted. The second outer portion 6E2 is formed with a second through-hole 6H2 through which a round protrusion 8P (see FIG. 4) formed on the upper surface of the second pedestal 8D2 is inserted. The third outer portion 6E3 is formed with a third through-hole 6H3 through which a round protrusion 8P (see FIG. 4) formed on the upper surface of the fifth pedestal 8D5 is inserted. The fourth outer portion 6E4 is formed with a fourth through-hole 6H4 through which a round protrusion 8P (see FIG. 4) formed on the upper surface of the sixth pedestal 8D6 is inserted. In the illustrated example, the leaf spring 6 and the protrusion 8P are bonded together using an adhesive. However, the joining of the leaf spring 6 and the protrusion 8P may be achieved by subjecting the protrusion 8P to heat caulking or cold caulking.

[0034] 3, the leaf spring 6 is configured to have two-fold rotational symmetry about the optical axis OA. Therefore, the leaf spring 6 can support the lens holding member 2 in good balance in the air. Furthermore, the leaf spring 6 does not adversely affect the weight balance of the movable-side member MB (lens holding member 2) supported by the four shape memory alloy wires SA (first wire SA1 to fourth wire SA4).

[0035] Next, the positional relationship between the base member 8 and the members that come into contact with the base member 8 will be described with reference to Fig. 4. Fig. 4 is a top perspective view of the first to eighth base-side metal members 5F1 to 5F8, the leaf spring 6, the base member 8, and the base-side embedded member 9. Specifically, the top view of Fig. 4 (the view above the block arrow) is an exploded perspective view, and the bottom view of Fig. 4 (the view below the block arrow) is an assembled perspective view.

[0036] 4, the base-side metal members 5F (first base-side metal member 5F1 to eighth base-side metal member 5F8) are fixed to the upper surface (mounting surface) of the pedestal portion 8D (first pedestal portion 8D1 to eighth pedestal portion 8D8) of the base member 8. Specifically, as shown in FIG. 8, the base-side metal members 5F are placed on the upper surface (mounting surface) of the pedestal portion 8D, and are joined by a conductive adhesive, soldering, welding, or the like to the joint portion of the base-side embedded member 9 exposed on the upper surface (mounting surface) of the pedestal portion 8D.

[0037] More specifically, the first base-side metal member 5F1 is joined to a first joint portion 9AP of the first base-side embedded member 9A exposed on the upper surface (mounting surface) of the first pedestal portion 8D1, the second base-side metal member 5F2 is joined to a fifth front joint portion 9EP1 of the fifth base-side embedded member 9E exposed on the upper surface (mounting surface) of the second pedestal portion 8D2, the third base-side metal member 5F3 is joined to a second joint portion 9BP of the second base-side embedded member 9B exposed on the upper surface (mounting surface) of the third pedestal portion 8D3, and the fourth base-side metal member 5F4 is joined to a sixth front joint portion 9FP1 of the sixth base-side embedded member 9F exposed on the upper surface (mounting surface) of the fourth pedestal portion 8D4. The fifth base side metal member 5F5 is joined to the third joint 9CP of the third base side embedded member 9C exposed on the upper surface (mounting surface) of the fifth pedestal portion 8D5, the sixth base side metal member 5F6 is joined to the sixth rear joint 9FP2 of the sixth base side embedded member 9F exposed on the upper surface (mounting surface) of the sixth pedestal portion 8D6, the seventh base side metal member 5F7 is joined to the fourth joint 9DP of the fourth base side embedded member 9D exposed on the upper surface (mounting surface) of the seventh pedestal portion 8D7, and the eighth base side metal member 5F8 is joined to the fifth rear joint 9EP2 of the fifth base side embedded member 9E exposed on the upper surface (mounting surface) of the eighth pedestal portion 8D8.

[0038] In the illustrated example, the top surfaces (mounting surfaces) of the first pedestal portion 8D1, the second pedestal portion 8D2, the fifth pedestal portion 8D5, and the sixth pedestal portion 8D6 are configured to have the same height, and the top surfaces (mounting surfaces) of the third pedestal portion 8D3, the fourth pedestal portion 8D4, the seventh pedestal portion 8D7, and the eighth pedestal portion 8D8 are configured to have the same height. The top surfaces (mounting surfaces) of the first pedestal portion 8D1, the second pedestal portion 8D2, the fifth pedestal portion 8D5, and the sixth pedestal portion 8D6 are configured to be higher than the top surfaces (mounting surfaces) of the third pedestal portion 8D3, the fourth pedestal portion 8D4, the seventh pedestal portion 8D7, and the eighth pedestal portion 8D8.

[0039] Next, referring to FIG. 5 , the metal member 5 to which the shape memory alloy wire SA is attached will be described. FIG. 5 is a diagram showing an example of the configuration of the base-side metal member 5F (first base-side metal member 5F1 to eighth base-side metal member 5F8), the lens-side metal member 5M (first lens-side metal member 5M1 to fourth lens-side metal member 5M4), and the shape memory alloy wire SA (first wire SA1 to fourth wire SA4). Specifically, the upper left diagram of FIG. 5 is a top view of the base-side metal member 5F, the lens-side metal member 5M, and the shape memory alloy wire SA. The upper right diagram of FIG. 5 is a right side view of the base-side metal member 5F, the lens-side metal member 5M, and the shape memory alloy wire SA. The lower diagram of FIG. 5 is a front view of the base-side metal member 5F, the lens-side metal member 5M, and the shape memory alloy wire SA. Note that the positional relationship of each member shown in FIG. 5 corresponds to the positional relationship when the lens driving device 101 is in a neutral state.

[0040] Specifically, one end of the first wire SA1 is fixed to the first base side metal member 5F1 at the left wire fixing portion J11 of the first base side metal member 5F1, the other end of the first wire SA1 is fixed to the second base side metal member 5F2 at the right wire fixing portion J13 of the second base side metal member 5F2, and the middle portion of the first wire SA1 is fixed to the first lens side metal member 5M1 at the middle wire fixing portion J12 of the first lens side metal member 5M1. The left wire fixing portion J11, the middle wire fixing portion J12, and the right wire fixing portion J13 constitute the first wire fixing portion J1.

[0041] One end of the second wire SA2 is fixed to the third base metal member 5F3 at a right wire fixing portion J21 of the third base metal member 5F3, the other end of the second wire SA2 is fixed to the fourth base metal member 5F4 at a left wire fixing portion J23 of the fourth base metal member 5F4, and the middle portion of the second wire SA2 is fixed to the second lens metal member 5M2 at a middle wire fixing portion J22 of the second lens metal member 5M2. The right wire fixing portion J21, the middle wire fixing portion J22, and the left wire fixing portion J23 form the second wire fixing portion J2.

[0042] One end of the third wire SA3 is fixed to the fifth base metal member 5F5 at the right wire fixing portion J31 of the fifth base metal member 5F5, the other end of the third wire SA3 is fixed to the sixth base metal member 5F6 at the left wire fixing portion J33 of the sixth base metal member 5F6, and the middle portion of the third wire SA3 is fixed to the third lens metal member 5M3 at the middle wire fixing portion J32 of the third lens metal member 5M3. The right wire fixing portion J31, the middle wire fixing portion J32, and the left wire fixing portion J33 form the third wire fixing portion J3.

[0043] One end of the fourth wire SA4 is fixed to the seventh base metal member 5F7 at the left wire fixing portion J41 of the seventh base metal member 5F7, the other end of the fourth wire SA4 is fixed to the eighth base metal member 5F8 at the right wire fixing portion J43 of the eighth base metal member 5F8, and the middle portion of the fourth wire SA4 is fixed to the fourth lens metal member 5M4 at the middle wire fixing portion J42 of the fourth lens metal member 5M4. The left wire fixing portion J41, the middle wire fixing portion J42, and the right wire fixing portion J43 form the fourth wire fixing portion J4.

[0044] The left wire-fixing portion J11 is formed by bending a portion of the first base-side metal member 5F1. Specifically, the portion of the first base-side metal member 5F1 is bent while sandwiching one end of the first wire SA1, thereby forming the left wire-fixing portion J11. The one end of the first wire SA1 is then fixed to the left wire-fixing portion J11 by welding. The same applies to the middle wire-fixing portion J12 and the right wire-fixing portion J13 of the first wire-fixing portion J1, the right wire-fixing portion J21, the middle wire-fixing portion J22, and the left wire-fixing portion J23 of the second wire-fixing portion J2, the right wire-fixing portion J31, the middle wire-fixing portion J32, and the left wire-fixing portion J33 of the third wire-fixing portion J3, and the left wire-fixing portion J41, the middle wire-fixing portion J42, and the right wire-fixing portion J43 of the fourth wire-fixing portion J4. Also, as shown in the lower diagram (front view) of Figure 5, the first wire SA1 and the third wire SA3 are arranged so as to form an approximately V-shape when viewed from the front, and the second wire SA2 and the fourth wire SA4 are arranged so as to form an approximately inverted V-shape when viewed from the front (or rear).

[0045] The base member 8 is configured to function as a wire support member that supports both ends (one end and the other end) of each of the first wire SA1 to the fourth wire SA4. With this configuration, the lens holding member 2 is connected to the base member 8 via the first wire SA1 to the fourth wire SA4 in a state that is movable in the optical axis direction (Z-axis direction), which is a direction parallel to the optical axis OA.

[0046] In the illustrated example, each of the base-side metal member 5F and the lens-side metal member 5M is formed of a metal plate having a plate-shaped base portion BP. Specifically, the first base-side metal member 5F1 has a base portion BPF1, the second base-side metal member 5F2 has a base portion BPF2, the third base-side metal member 5F3 has a base portion BPF3, the fourth base-side metal member 5F4 has a base portion BPF4, the fifth base-side metal member 5F5 has a base portion BPF5, the sixth base-side metal member 5F6 has a base portion BPF6, the seventh base-side metal member 5F7 has a base portion BPF7, and the eighth base-side metal member 5F8 has a base portion BPF8. Similarly, the first lens side metal member 5M1 has a base portion BPM1, the second lens side metal member 5M2 has a base portion BPM2, the third lens side metal member 5M3 has a base portion BPM3, and the fourth lens side metal member 5M4 has a base portion BPM4. As shown in the lower diagram (front view) of Figure 5, the first base side metal member 5F1 to the eighth base side metal member 5F8 and the first lens side metal member 5M1 to the fourth lens side metal member 5M4 are attached to the base member 8 or the lens holding member 2 so that the plate surfaces of the base portions BPF1 to BPF8 and the base portions BPM1 to BPM4 are parallel to the XY plane, that is, so that they are approximately parallel to each other. Furthermore, the first base side metal member 5F1 and the second base side metal member 5F2 are positioned higher in the Z-axis direction than the first lens side metal member 5M1, and the third base side metal member 5F3 and the fourth base side metal member 5F4 are positioned lower in the Z-axis direction than the second lens side metal member 5M2. That is, the middle portion of the first wire SA1 is positioned lower by a height HT1 than one end and the other end of the first wire SA1. Furthermore, the middle portion of the second wire SA2 is positioned higher by a height HT2 than one end and the other end of the second wire SA2. Furthermore, the first lens side metal member 5M1 is positioned higher in the Z-axis direction than the second lens side metal member 5M2. Similarly, the fifth base side metal member 5F5 and the sixth base side metal member 5F6 are positioned higher in the Z-axis direction than the third lens side metal member 5M3, and the seventh base side metal member 5F7 and the eighth base side metal member 5F8 are positioned lower in the Z-axis direction than the fourth lens side metal member 5M4.The third lens metal member 5M3 is positioned higher in the Z-axis direction than the fourth lens metal member 5M4. The first lens metal member 5M1 is positioned at the same height as the third lens metal member 5M3 in the Z-axis direction, and the second lens metal member 5M2 is positioned at the same height as the fourth lens metal member 5M4 in the Z-axis direction.

[0047] Next, the positional relationship between the metal member 5, the base-side embedded member 9, and the shape memory alloy wire SA, which are members through which current flows, will be described with reference to Figures 6 and 7. Figure 6 is a perspective view of the metal member 5, the base-side embedded member 9, and the shape memory alloy wire SA. Figure 7 is a view extracted from Figure 6, in which the upper left view of Figure 7 shows members related to the current path including the first wire SA1, the lower left view of Figure 7 shows members related to the current path including the second wire SA2, the upper right view of Figure 7 shows members related to the current path including the third wire SA3, and the lower right view of Figure 7 shows members related to the current path including the fourth wire SA4.

[0048] As shown in the upper left diagram of Figure 7, when the first terminal portion 9AT of the first base side buried member 9A is connected to a high potential and the fifth terminal portion 9ET of the fifth base side buried member 9E is connected to a low potential, current flows from the first terminal portion 9AT of the first base side buried member 9A, through the first joint portion 9AP of the first base side buried member 9A, the first base side metal member 5F1 (base portion BPF1 and left wire fixing portion J11), the first wire SA1, the second base side metal member 5F2 (right wire fixing portion J13 and base portion BPF2), and the fifth front joint portion 9EP1 of the fifth base side buried member 9E, to the fifth terminal portion 9ET of the fifth base side buried member 9E.

[0049] Also, as shown in the lower left diagram of Figure 7, when the second terminal portion 9BT of the second base side buried member 9B is connected to a high potential and the sixth terminal portion 9FT of the sixth base side buried member 9F is connected to a low potential, current flows from the second terminal portion 9BT of the second base side buried member 9B, through the second joint portion 9BP of the second base side buried member 9B, the third base side metal member 5F3 (base portion BPF3 and right wire fixing portion J21), the second wire SA2, the fourth base side metal member 5F4 (left wire fixing portion J23 and base portion BPF4), and the sixth front joint portion 9FP1 of the sixth base side buried member 9F, to the sixth terminal portion 9FT of the sixth base side buried member 9F.

[0050] Also, as shown in the upper right diagram of Figure 7, when the third terminal portion 9CT of the third base side buried member 9C is connected to a high potential and the sixth terminal portion 9FT of the sixth base side buried member 9F is connected to a low potential, current flows from the third terminal portion 9CT of the third base side buried member 9C, through the third joint portion 9CP of the third base side buried member 9C, the fifth base side metal member 5F5 (base BPF5 and right wire fixing portion J31), the third wire SA3, the sixth base side metal member 5F6 (left wire fixing portion J33 and base BPF6), and the sixth rear joint portion 9FP2 of the sixth base side buried member 9F, to the sixth terminal portion 9FT of the sixth base side buried member 9F.

[0051] Also, as shown in the lower right diagram of Figure 7, when the fourth terminal portion 9DT of the fourth base side buried member 9D is connected to a high potential and the fifth terminal portion 9ET of the fifth base side buried member 9E is connected to a low potential, current flows from the fourth terminal portion 9DT of the fourth base side buried member 9D, through the fourth joint portion 9DP of the fourth base side buried member 9D, the seventh base side metal member 5F7 (base BPF7 and left wire fixing portion J41), the fourth wire SA4, the eighth base side metal member 5F8 (right wire fixing portion J43 and base BPF8), and the fifth rear joint portion 9EP2 of the fifth base side buried member 9E, to the fifth terminal portion 9ET of the fifth base side buried member 9E.

[0052] The control device external to the lens driving device 101 as described above can control the length of each of the shape memory alloy wires SA (first wire SA1 to fourth wire SA4) by controlling the voltage applied to each of the terminals (first terminal 9AT to sixth terminal 9FT) of the first base-side buried member 9A to sixth base-side buried member 9F. For example, the control device may detect the electrical resistance value of each of the shape memory alloy wires SA using various sensors (not shown) and control the length of each of the shape memory alloy wires SA according to the detection results. The control device may be disposed within the lens driving device 101. Furthermore, the control device may be a component of the lens driving device 101.

[0053] The control device may, for example, use a driving force parallel to the optical axis OA due to contraction of the shape memory alloy wire SA as the driving unit DM to move the lens holding member 2 on the Z1 side (subject side) of the image sensor IS in a direction parallel to the optical axis OA (Z-axis direction). By moving the lens holding member 2 in this manner, the control device may realize an autofocus function, which is one of the lens adjustment functions. Specifically, the control device may move the lens holding member 2 away from the image sensor to enable macro photography, and move the lens holding member 2 toward the image sensor to enable infinity photography.

[0054] Next, an example of a method for assembling the metal member 5 and the shape memory alloy wire SA to the lens holding member 2 and the base member 8 will be described with reference to Fig. 8. Fig. 8 is a perspective view of the lens driving device 101 with the upper cover member 1 removed. For clarity, the upper cover member 1 is not shown in Fig. 8, and a fine dot pattern is applied to the lens holding member 2 and a coarse dot pattern is applied to the base member 8.

[0055] 8 , the first base-side metal member 5F1, the second base-side metal member 5F2, and the first lens-side metal member 5M1 are connected by a first wire SA1 and assembled to the base member 8 and the lens holding member 2. Similarly, the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 are connected by a second wire SA2 and assembled to the base member 8 and the lens holding member 2, the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3 are connected by a third wire SA3 and assembled to the base member 8 and the lens holding member 2, and the seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 are connected by a fourth wire SA4 and assembled to the base member 8 and the lens holding member 2.

[0056] Specifically, first, a combination of the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 connected by the second wire SA2, and a combination of the seventh base side metal member 5F7, the eighth base side metal member 5F8, and the fourth lens side metal member 5M4 connected by the fourth wire SA4 are assembled from directly above to the base member 8 and the lens holding member 2. Then, after that, a combination of the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 connected by the first wire SA1, and a combination of the fifth base side metal member 5F5, the sixth base side metal member 5F6, and the third lens side metal member 5M3 connected by the third wire SA3 are assembled from directly above to the base member 8 and the lens holding member 2. Note that a combination of the first base-side metal member 5F1, the second base-side metal member 5F2, and the first lens-side metal member 5M1 connected by the first wire SA1 and a combination of the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 connected by the second wire SA2 may be simultaneously assembled to the base member 8 and the lens holding member 2. Similarly, a combination of the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3 connected by the third wire SA3 and a combination of the seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 connected by the fourth wire SA4 may be simultaneously assembled to the base member 8 and the lens holding member 2. Furthermore, all four combinations may be simultaneously assembled to the base member 8 and the lens holding member 2.

[0057] 8, after the leaf spring 6 is assembled to the lens holding member 2 and the base member 8, the metal member 5 and the shape memory alloy wire SA are assembled to the lens holding member 2 and the base member 8. However, the metal member 5 and the shape memory alloy wire SA may be assembled to the lens holding member 2 and the base member 8 before the leaf spring 6 is assembled to the lens holding member 2 and the base member 8.

[0058] Next, a lens driving device 101A, which is another configuration example of the lens driving device 101 according to the embodiment of the present disclosure, will be described with reference to FIGS. 9 and 10 . FIG. 9 is an exploded perspective view of the lens driving device 101A. FIG. 10 is a three-view diagram of the base-side metal member 5F, the lens-side metal member 5M, and the shape memory alloy wire SA that constitute the lens driving device 101A, and corresponds to FIG. 5 . Specifically, the upper left view of FIG. 10 is a top view, the upper right view of FIG. 10 is a right side view, and the bottom view of FIG. 10 is a front view. Note that the positional relationship of each component shown in FIG. 10 corresponds to the positional relationship when the lens driving device 101A is in a neutral state.

[0059] The lens driving device 101A differs from the lens driving device 101 mainly in that the base-side metal member 5F is attached laterally to the side surface of the base member 8, and the lens-side metal member 5M is attached laterally to the side surface of the lens holding member 2. In the lens driving device 101, the base-side metal member 5F is attached from above to the upper surface of the base member 8, and the lens-side metal member 5M is attached from above to the upper surface of the lens holding member 2.

[0060] Specifically, in the lens driving device 101A, the first base side metal member 5F1 to the eighth base side metal member 5F8 and the first lens side metal member 5M1 to the fourth lens side metal member 5M4 are each made of a metal plate having a plate-shaped base portion BP, similar to the case of the lens driving device 101. Unlike the case of the lens driving device 101, the first base side metal member 5F1 to the eighth base side metal member 5F8 and the first lens side metal member 5M1 to the fourth lens side metal member 5M4 are each configured so that the plate surface of the base portion BP is approximately parallel to the optical axis OA.

[0061] More specifically, the first base-side metal member 5F1 to the eighth base-side metal member 5F8 and the first lens-side metal member 5M1 to the fourth lens-side metal member 5M4 are arranged so that the plate surfaces of the base portions BPF1 to BPF8 and the base portions BPM1 to BPM4 are substantially parallel to each other. Furthermore, the first wire SA1 to the fourth wire SA4 are each configured to be linear when energized in a plan view along the optical axis direction (see the upper left diagram (top view) of FIG. 10 ). Furthermore, as shown in the bottom diagram (front view) of FIG. 10 , the first wire SA1 is arranged to be substantially V-shaped in a front view, the second wire SA2 is arranged to be substantially inverted V-shaped in a front view, the third wire SA3 is arranged to be substantially V-shaped in a front view (or rear view), and the fourth wire SA4 is arranged to be substantially inverted V-shaped in a front view (or rear view). The first base-side metal member 5F1, the second base-side metal member 5F2, the fifth base-side metal member 5F5, and the sixth base-side metal member 5F6 are arranged so that the positions (heights) of the left wire fixing portion J11, the right wire fixing portion J13, the right wire fixing portion J31, and the left wire fixing portion J33 are the same in the Z-axis direction. Similarly, the third base-side metal member 5F3, the fourth base-side metal member 5F4, the seventh base-side metal member 5F7, and the eighth base-side metal member 5F8 are arranged so that the positions (heights) of the right wire fixing portion J21, the left wire fixing portion J23, the left wire fixing portion J41, and the right wire fixing portion J43 are the same in the Z-axis direction. Furthermore, the first lens side metal member 5M1 and the second lens side metal member 5M2 are arranged in the Z axis direction so that the position (height) of the intermediate wire fixing portion J12 (portion to which the first wire SA1 is fixed) is lower than the position (height) of the intermediate wire fixing portion J22 (portion to which the second wire SA2 is fixed). Similarly, the third lens side metal member 5M3 and the fourth lens side metal member 5M4 are arranged in the Z axis direction so that the position (height) of the intermediate wire fixing portion J32 (portion to which the third wire SA3 is fixed) is lower than the position (height) of the intermediate wire fixing portion J42 (portion to which the fourth wire SA4 is fixed).

[0062] This configuration has the advantage that the combination of the first base-side metal member 5F1, the second base-side metal member 5F2, and the first lens-side metal member 5M1, and the combination of the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 can each be attached to the corresponding member (the base member 8 or the lens holding member 2) from the same side (the front side (X1 side) in the illustrated example). Similarly, the combination of the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3, and the combination of the seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 can each be attached to the corresponding member (the base member 8 or the lens holding member 2) from the same side (the rear side (X2 side) in the illustrated example). Therefore, this configuration can improve the productivity (assembly) of the lens driving device 101A compared to when the metal member 5 is attached from four sides (front, left, rear, and right).

[0063] Next, the positional relationship between the metal member 5, the base-side embedded member 9, and the shape memory alloy wire SA, which are members through which current flows, will be described with reference to Figures 11 and 12. Figure 11 is a perspective view of the metal member 5, the base-side embedded member 9, and the shape memory alloy wire SA, and corresponds to Figure 6. Figure 12 is a view of a portion of Figure 11, and corresponds to Figure 7. Specifically, the upper left view of Figure 12 shows members related to the current path including the first wire SA1, the lower left view of Figure 12 shows members related to the current path including the second wire SA2, the upper right view of Figure 12 shows members related to the current path including the third wire SA3, and the lower right view of Figure 12 shows members related to the current path including the fourth wire SA4.

[0064] As shown in the upper left diagram of Figure 12, when the first terminal portion 9AT of the first base side buried member 9A is connected to a high potential and the fifth terminal portion 9ET of the fifth base side buried member 9E is connected to a low potential, current flows from the first terminal portion 9AT of the first base side buried member 9A, through the first joint portion 9AP of the first base side buried member 9A, the second base side metal member 5F2 (base BPF2 and right wire fixing portion J13), the first wire SA1, the first base side metal member 5F1 (left wire fixing portion J11 and base BPF1), and the fifth upper front joint portion 9EPa of the fifth base side buried member 9E, to the fifth terminal portion 9ET of the fifth base side buried member 9E.

[0065] Also, as shown in the lower left diagram of Figure 12, when the second terminal portion 9BT of the second base side buried member 9B is connected to a high potential and the fifth terminal portion 9ET of the fifth base side buried member 9E is connected to a low potential, current flows from the second terminal portion 9BT of the second base side buried member 9B, through the second joint portion 9BP of the second base side buried member 9B, the third base side metal member 5F3 (base BPF3 and right wire fixing portion J21), the second wire SA2, the fourth base side metal member 5F4 (left wire fixing portion J23 and base BPF4), and the fifth lower front joint portion 9EPb of the fifth base side buried member 9E, to the fifth terminal portion 9ET of the fifth base side buried member 9E.

[0066] Also, as shown in the upper right diagram of Figure 7, when the third terminal portion 9CT of the third base-side buried member 9C is connected to a high potential and the fifth terminal portion 9ET of the fifth base-side buried member 9E is connected to a low potential, current flows from the third terminal portion 9CT of the third base-side buried member 9C, through the third joint portion 9CP of the third base-side buried member 9C, the fifth base-side metal member 5F5 (base BPF5 and right wire fixing portion J31), the third wire SA3, the sixth base-side metal member 5F6 (left wire fixing portion J33 and base BPF6), and the fifth upper rear joint portion 9EPc of the fifth base-side buried member 9E, to the fifth terminal portion 9ET of the fifth base-side buried member 9E.

[0067] Also, as shown in the lower right diagram of Figure 7, when the fourth terminal portion 9DT of the fourth base side buried member 9D is connected to a high potential and the fifth terminal portion 9ET of the fifth base side buried member 9E is connected to a low potential, current flows from the fourth terminal portion 9DT of the fourth base side buried member 9D, through the fourth joint portion 9DP of the fourth base side buried member 9D, the eighth base side metal member 5F8 (base BPF8 and right wire fixing portion J43), the fourth wire SA4, the seventh base side metal member 5F7 (left wire fixing portion J41 and base BPF7), and the fifth lower rear joint portion 9EPd of the fifth base side buried member 9E, to the fifth terminal portion 9ET of the fifth base side buried member 9E.

[0068] A control device external to the lens driving device 101A as described above can control the length of each of the shape memory alloy wires SA (first wire SA1 to fourth wire SA4) by controlling the voltage applied to each of the terminals (first terminal 9AT to fifth terminal 9ET) of the first base-side embedded member 9A to fifth base-side embedded member 9E. For example, the control device may detect the electrical resistance value of each of the shape memory alloy wires SA using various sensors (not shown) and control the length of each of the shape memory alloy wires SA according to the detection results. The control device may be disposed within the lens driving device 101A. Furthermore, the control device may be a component of the lens driving device 101A.

[0069] The control device may, for example, use a driving force parallel to the optical axis OA due to contraction of the shape memory alloy wire SA as the driving unit DM to move the lens holding member 2 on the Z1 side (subject side) of the image sensor IS in a direction parallel to the optical axis OA (Z-axis direction). By moving the lens holding member 2 in this manner, the control device may realize an autofocus function, which is one of the lens adjustment functions. Specifically, the control device may move the lens holding member 2 away from the image sensor to enable macro photography, and move the lens holding member 2 toward the image sensor to enable infinity photography.

[0070] As described above, the lens driving device 101 according to the embodiment of the present disclosure includes, as shown in FIG. 2 , a base member 8, a lens holding member 2 capable of holding a lens body LS, and a drive unit DM configured with a shape memory alloy wire SA that moves the lens holding member 2 along the optical axis direction relative to the base member 8. The shape memory alloy wire SA includes a first wire SA1 and a third wire SA3, both end portions of which are positioned above the center in the optical axis direction, and a second wire SA2 and a fourth wire SA4, both end portions of which are positioned below the center in the optical axis direction. The first wire SA1 and the third wire SA3 are arranged in a pair on either side of the optical axis OA of the lens body LS in a first direction (X-axis direction) that intersects the optical axis direction. Similarly, the second wire SA2 and the fourth wire SA4 are arranged in a pair on either side of the optical axis OA in the first direction (X-axis direction). The base member 8 is provided with a first base-side metal member 5F1 and a second base-side metal member 5F2 that are spaced apart in a second direction (Y-axis direction) that intersects the optical axis direction and is substantially perpendicular to the first direction (X-axis direction), a third base-side metal member 5F3 and a fourth base-side metal member 5F4 that are spaced apart in the second direction (Y-axis direction), a fifth base-side metal member 5F5 and a sixth base-side metal member 5F6 that are spaced apart in the second direction (Y-axis direction), and a seventh base-side metal member 5F7 and an eighth base-side metal member 5F8 that are spaced apart in the second direction (Y-axis direction). The first wire SA1 has one end fixed to the first base-side metal member 5F1, the other end fixed to the second base-side metal member 5F2, and an intermediate portion located between the one end and the other end fixed to a first central fixing portion CF1 provided on the lens holding member 2. The second wire SA2 has one end fixed to the third base side metal member 5F3, the other end fixed to the fourth base side metal member 5F4, and an intermediate portion located between the one end and the other end fixed to a second central fixing portion CF2 provided on the lens holding member 2. The third wire SA3 has one end fixed to the fifth base side metal member 5F5, and the other end fixed to the sixth base side metal member 5F6, and an intermediate portion located between the one end and the other end fixed to a third central fixing portion CF3 provided on the lens holding member 2.Furthermore, the fourth wire SA4 has one end fixed to the seventh base-side metal member 5F7, the other end fixed to the eighth base-side metal member 5F8, and an intermediate portion located between the one end and the other end fixed to a fourth central fixing portion CF4 provided on the lens holding member 2. In a plan view along the optical axis direction, the first central fixing portion CF1 is disposed between the first base-side metal member 5F1 and the second base-side metal member 5F2, the second central fixing portion CF2 is disposed between the third base-side metal member 5F3 and the fourth base-side metal member 5F4, the third central fixing portion CF3 is disposed between the fifth base-side metal member 5F5 and the sixth base-side metal member 5F6, and the fourth central fixing portion CF4 is disposed between the seventh base-side metal member 5F7 and the eighth base-side metal member 5F8.

[0071] This configuration has the advantage of improving the ease of assembly of the lens driving device 101, since the number of surfaces on which the metal members 5 are arranged is reduced compared to a configuration in which the metal members 5 are arranged on all four sides (front, back, left, and right).

[0072] Also, preferably, the first central fixing portion CF1 is constituted by a first lens side metal member 5M1 formed from metal, the second central fixing portion CF2 is constituted by a second lens side metal member 5M2 formed from metal, the third central fixing portion CF3 is constituted by a third lens side metal member 5M3 formed from metal, and the fourth central fixing portion CF4 is constituted by a fourth lens side metal member 5M4 formed from metal.

[0073] This configuration has the effect of reliably fixing the center portion of the shape memory alloy wire SA, and therefore has the effect of preventing the center portion of the shape memory alloy wire SA from being excessively worn or falling off the lens holding member 2.

[0074] Preferably, as shown in FIG. 5 , the first base metal member 5F1, the second base metal member 5F2, and the first lens metal member 5M1 are each formed of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP of the first base metal member 5F1, the second base metal member 5F2, and the first lens metal member 5M1 are generally parallel to one another. The third base metal member 5F3, the fourth base metal member 5F4, and the second lens metal member 5M2 are each formed of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP of the third base metal member 5F3, the fourth base metal member 5F4, and the second lens metal member 5M2 are generally parallel to one another. The fifth base metal member 5F5, the sixth base metal member 5F6, and the third lens metal member 5M3 are each formed of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP constituting the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3 are substantially parallel to each other. The seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 are each composed of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP constituting the seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 are substantially parallel to each other. The plate surfaces of the base portions BP constituting the first base-side metal member 5F1 and the second base-side metal member 5F2 are located on the same plane. In the embodiments of the present disclosure (the embodiment shown in FIG. 2 and the embodiment shown in FIG. 9), even when the plate surfaces of the base portions BP of multiple metal members 5 are located on the same plane, this also falls within the configuration in which the plate surfaces of the base portions BP are parallel (substantially parallel) to each other.

[0075] This configuration brings about the effect of further improving the ease of assembly of the lens driving device 101. This is because this configuration allows a plurality of metal members 5 to be fixed to corresponding members from the same side.

[0076] Preferably, the first base-side metal member 5F1, the third base-side metal member 5F3, the fifth base-side metal member 5F5, and the seventh base-side metal member 5F7 have the same shape and size. The second base-side metal member 5F2, the fourth base-side metal member 5F4, the sixth base-side metal member 5F6, and the eighth base-side metal member 5F8 have the same shape and size. The first lens-side metal member 5M1, the second lens-side metal member 5M2, the third lens-side metal member 5M3, and the fourth lens-side metal member 5M4 have the same shape and size. In the example shown in FIG. 5 , the combination of the first base-side metal member 5F1, the second base-side metal member 5F2, and the first lens-side metal member 5M1 and the combination of the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3 have two-fold rotational symmetry about the optical axis OA in a plan view (top view). Furthermore, the combination of the first base-side metal member 5F1, the second base-side metal member 5F2, and the first lens-side metal member 5M1 and the combination of the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 have a relationship of two-fold rotational symmetry about a line CX parallel to the X-axis in a front view. Similarly, the combination of the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 and the combination of the seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 have a relationship of two-fold rotational symmetry about the optical axis OA in a plan view (top view). Furthermore, the combination of the fifth base side metal member 5F5, the sixth base side metal member 5F6, and the third lens side metal member 5M3 and the combination of the seventh base side metal member 5F7, the eighth base side metal member 5F8, and the fourth lens side metal member 5M4 are in a two-fold rotationally symmetric relationship around a line CX parallel to the X-axis when viewed from the front.

[0077] This configuration has the advantage of being able to reduce the number of parts by standardizing parts, compared to when the first base side metal member 5F1, the third base side metal member 5F3, the fifth base side metal member 5F5, and the seventh base side metal member 5F7 have different shapes or sizes, when the second base side metal member 5F2, the fourth base side metal member 5F4, the sixth base side metal member 5F6, and the eighth base side metal member 5F8 have different shapes or sizes, or when the first lens side metal member 5M1, the second lens side metal member 5M2, the third lens side metal member 5M3, and the fourth lens side metal member 5M4 have different shapes or sizes.

[0078] Furthermore, as shown in FIG. 5, it is desirable that the plate surfaces of each base portion BP constituting each of the first base side metal member 5F1, the second base side metal member 5F2, the third base side metal member 5F3, the fourth base side metal member 5F4, the fifth base side metal member 5F5, the sixth base side metal member 5F6, the seventh base side metal member 5F7, the eighth base side metal member 5F8, the first lens side metal member 5M1, the second lens side metal member 5M2, the third lens side metal member 5M3, and the fourth lens side metal member 5M4 are approximately perpendicular to the optical axis direction (Z-axis direction).

[0079] This configuration brings about the effect that all of the base-side metal member 5F and the lens-side metal member 5M can be attached from above to the base member 8 or the lens holding member 2. Therefore, this configuration brings about the effect that the productivity (assembly) of the lens driving device 101 can be further improved.

[0080] Furthermore, preferably, the first base-side metal member 5F1, the first lens-side metal member 5M1, and the second base-side metal member 5F2 are shifted to the same side (Y2 side) in the second direction (Y-axis direction) relative to the fourth base-side metal member 5F4, the second lens-side metal member 5M2, and the third base-side metal member 5F3, respectively. In the example shown in Fig. 5, the first base-side metal member 5F1 is arranged adjacent to the Y2 side of the fourth base-side metal member 5F4, the first lens-side metal member 5M1 is arranged adjacent to the Y2 side of the second lens-side metal member 5M2, and the second base-side metal member 5F2 is arranged adjacent to the Y2 side of the third base-side metal member 5F3. Furthermore, it is preferable that the fifth base-side metal member 5F5, the third lens-side metal member 5M3, and the sixth base-side metal member 5F6 are shifted to the same side (Y1 side) in the second direction (Y-axis direction) with respect to the eighth base-side metal member 5F8, the fourth lens-side metal member 5M4, and the seventh base-side metal member 5F7, respectively. In the example shown in Fig. 5 , the fifth base-side metal member 5F5 is arranged adjacent to the eighth base-side metal member 5F8 on the Y1 side, the third lens-side metal member 5M3 is arranged adjacent to the fourth lens-side metal member 5M4 on the Y1 side, and the sixth base-side metal member 5F6 is arranged adjacent to the seventh base-side metal member 5F7 on the Y1 side.

[0081] This configuration has the effect of further improving the ease of assembly of the lens driving device 101. This is because excessive interference between the metal members 5 when assembling them to corresponding members can be suppressed. This configuration also has the effect of suppressing an increase in the dimension in the first direction (X-axis direction). This is because the metal members 5 are arranged so as not to overlap in the first direction (X-axis direction).

[0082] 2 and 5 , in a plan view along the optical axis direction, the first central fixing portion CF1 (first lens side metal member 5M1) and the second central fixing portion CF2 (second lens side metal member 5M2) are preferably arranged adjacent to each other, and the third central fixing portion CF3 (third lens side metal member 5M3) and the fourth central fixing portion CF4 (fourth lens side metal member 5M4) are preferably arranged adjacent to each other. Note that, in a plan view along the optical axis direction, the first central fixing portion CF1 (first lens side metal member 5M1) and the second central fixing portion CF2 (second lens side metal member 5M2) may be arranged to partially overlap, and the third central fixing portion CF3 (third lens side metal member 5M3) and the fourth central fixing portion CF4 (fourth lens side metal member 5M4) may be arranged to partially overlap.

[0083] This configuration has the effect of preventing the first wire SA1 and the second wire SA2 from becoming entangled, and preventing the third wire SA3 and the fourth wire SA4 from becoming entangled, because the centers of the two shape memory alloy wires SA arranged adjacent to each other (extending parallel to each other) in a plan view are positioned close to each other.

[0084] 5, the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 each preferably have a first wire fixing portion J1. The third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 each preferably have a second wire fixing portion J2. The fifth base side metal member 5F5, the sixth base side metal member 5F6, and the third lens side metal member 5M3 each preferably have a third wire fixing portion J3. The seventh base side metal member 5F7, the eighth base side metal member 5F8, and the fourth lens side metal member 5M4 each preferably have a fourth wire fixing portion J4. Furthermore, the line L1 connecting the first wire fixing portion J1 (left wire fixing portion J11) of the first base side metal member 5F1 and the third wire fixing portion J3 (right wire fixing portion J31) of the fifth base side metal member 5F5, the line L2 connecting the first wire fixing portion J1 (right wire fixing portion J13) of the second base side metal member 5F2 and the third wire fixing portion J3 (left wire fixing portion J33) of the sixth base side metal member 5F6, the line L3 connecting the second wire fixing portion J2 (right wire fixing portion J21) of the third base side metal member 5F3 and the fourth wire fixing portion J4 (left wire fixing portion J41) of the seventh base side metal member 5F7, and the line L4 connecting the second wire fixing portion J2 (left wire fixing portion J23) of the fourth base side metal member 5F4 and the fourth wire fixing portion J4 (right wire fixing portion J43) of the eighth base side metal member 5F8 all pass along the optical axis OA. Similarly, a line L5 connecting the first wire fixing portion J1 (middle wire fixing portion J12) of the first lens side metal member 5M1 and the third wire fixing portion J3 (middle wire fixing portion J32) of the third lens side metal member 5M3, and a line L6 connecting the second wire fixing portion J2 (middle wire fixing portion J22) of the second lens side metal member 5M2 and the fourth wire fixing portion J4 (middle wire fixing portion J42) of the fourth lens side metal member 5M4, pass through the optical axis OA. The position of the first wire fixing portion J1 (left wire fixing portion J11) is, for example, the center position of the first wire SA1 fixed to the first wire fixing portion J1 (left wire fixing portion J11), and is represented by a dashed circle in the upper left diagram (top view) of FIG. 5 . The same applies to the position of the third wire fixing portion J3 (right wire fixing portion J31).

[0085] This configuration has the effect of stabilizing the movement of the lens holding member 2 relative to the base member 8. This is because it becomes easier to achieve a balance between the driving force by the first wire SA1 and the driving force by the third wire SA3, and a balance between the driving force by the second wire SA2 and the driving force by the fourth wire SA4.

[0086] Furthermore, as shown in Figures 9 and 10, the plate surfaces of each base portion BP constituting the first base side metal member 5F1, the second base side metal member 5F2, the third base side metal member 5F3, the fourth base side metal member 5F4, the fifth base side metal member 5F5, the sixth base side metal member 5F6, the seventh base side metal member 5F7, the eighth base side metal member 5F8, the first lens side metal member 5M1, the second lens side metal member 5M2, the third lens side metal member 5M3, and the fourth lens side metal member 5M4 may be approximately perpendicular to the first direction (X-axis direction).

[0087] This configuration has the effect of improving the ease of assembly of the lens driving device 101A compared to when the metal members 5 are attached to all four sides (front, back, left, and right) of the base member 8. This is because the attachment of the metal members 5 to the base member 8 can be completed simply by attaching the metal members 5 to the base member 8 from the outside in the X-axis direction (the X1 side and the X2 side, respectively). The same applies to the attachment of the metal members 5 to the lens holding member 2. Furthermore, this configuration has the effect of preventing the dimension of the lens driving device 101A from increasing in the first direction (X-axis direction) compared to when the plate surface of each base portion BP is approximately perpendicular to the optical axis OA.

[0088] 10 , the base portion BP (base portion BPM2) of the metal member 5 (second lens metal member 5M2) that is arranged on the outer side of the first lens metal member 5M1 and the second lens metal member 5M2 may be located between the first wire SA1 and the second wire SA2. Similarly, the base portion BP (base portion BPM4) of the metal member 5 (fourth lens metal member 5M4) that is arranged on the outer side of the third lens metal member 5M3 and the fourth lens metal member 5M4 may be located between the third wire SA3 and the fourth wire SA4.

[0089] This configuration has the effect of preventing the first wire SA1 and the second wire SA2 from becoming entangled, and also preventing the third wire SA3 and the fourth wire SA4 from becoming entangled. This is because, as shown in the lower diagram (front view) of Fig. 10 , the base portion BP (base portion BPM2) of the lens side metal member 5M (second lens side metal member 5M2) is arranged so as to separate the two shape memory alloy wires SA (the first wire SA1 and the second wire SA2) that are arranged adjacent to each other (extending parallel to each other) in a plan view.

[0090] 10 , the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 each have a first wire fixing portion J1, and the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 each have a second wire fixing portion J2. At least a portion of the first base side metal member 5F1 and the fourth base side metal member 5F4 are in the same position in the second direction (Y-axis direction), at least a portion of the second base side metal member 5F2 and the third base side metal member 5F3 are in the same position in the second direction (Y-axis direction), and at least a portion of the first lens side metal member 5M1 and the second lens side metal member 5M2 are in the same position in the second direction (Y-axis direction). The first wire fixing portion J1 (left wire fixing portion J11) of the first base side metal member 5F1 and the second wire fixing portion J2 (left wire fixing portion J23) of the fourth base side metal member 5F4, the first wire fixing portion J1 (middle wire fixing portion J12) of the first lens side metal member 5M1 and the second wire fixing portion J2 (middle wire fixing portion J22) of the second lens side metal member 5M2, and the first wire fixing portion J1 (right wire fixing portion J13) of the second base side metal member 5F2 and the second wire fixing portion J2 (right wire fixing portion J21) of the third base side metal member 5F3 are each located at (approximately) the same position in the second direction (Y-axis direction).

[0091] This configuration has the effect of suppressing an increase in the dimension of the lens driving device 101 in the second direction (Y-axis direction). This is because the base-side metal members 5F (the first base-side metal member 5F1 and the fourth base-side metal member 5F4, and the second base-side metal member 5F2 and the third base-side metal member 5F3) are arranged so that the overlapping area in the second direction (Y-axis direction) between adjacent base-side metal members 5F is as large as possible, i.e., so that the non-overlapping area in the second direction (Y-axis direction) is as small as possible. Note that in the example shown in FIG. 10 , there is no non-overlapping area in the Y-axis direction between the first base-side metal member 5F1 and the fourth base-side metal member 5F4, and there is no non-overlapping area in the Y-axis direction between the second base-side metal member 5F2 and the third base-side metal member 5F3.

[0092] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications and substitutions can be applied to the above-described embodiments and the embodiments described below without departing from the scope of the present invention. The features described with reference to the above-described embodiments and the embodiments described below can be combined as appropriate as long as there is no technical contradiction.

[0093] For example, in the above-described embodiment, the metal member 5 is fixed to each member (the lens holding member 2 and the base member 8) by adhesive or the like, but it may also be embedded in each member or may be a conductive pattern formed on the surface of each member.

[0094] Furthermore, in the above embodiment, the base member 8 constitutes the fixed member FB, but it may also be a movable member that moves separately from the lens holding member 2 .

[0095] This application claims priority based on Japanese Patent Application No. 2024-069918, filed on April 23, 2024, the entire contents of which are incorporated herein by reference.

[0096]

Claims

1. A lens driving device comprising: a base member; a lens holding member capable of holding a lens body; and a driving unit configured with a shape memory alloy wire that moves the lens holding member relative to the base member along the optical axis direction, wherein the shape memory alloy wire comprises a first wire and a third wire whose both ends are positioned above the center in the optical axis direction, and a second wire and a fourth wire whose both ends are positioned below the center in the optical axis direction, the first wire and the third wire being arranged in a pair on either side of the optical axis of the lens body in a first direction intersecting the optical axis direction, and the second wire and the fourth wire being arranged in a pair on either side of the optical axis in the first direction, the base member is provided with a first base-side metal member and a second base-side metal member arranged spaced apart in a second direction intersecting the optical axis direction and substantially perpendicular to the first direction, a third base-side metal member and a fourth base-side metal member arranged spaced apart in the second direction, a fifth base-side metal member and a sixth base-side metal member arranged spaced apart in the second direction, and a seventh base-side metal member and an eighth base-side metal member arranged spaced apart in the second direction; one end of the first wire is fixed to the first base-side metal member, the other end is fixed to the second base-side metal member, and an intermediate portion located between the one end and the other end is fixed to a first central fixing portion provided on the lens holding member; and one end of the second wire is fixed to the third base-side metal member, the other end is fixed to the fourth base-side metal member, and an intermediate portion located between the one end and the other end is fixed to a second central fixing portion provided on the lens holding member. the third wire has one end fixed to the fifth base-side metal member, the other end fixed to the sixth base-side metal member, and an intermediate portion located between the one end and the other end fixed to a third central fixing portion provided on the lens holding member; the fourth wire has one end fixed to the seventh base-side metal member, the other end fixed to the eighth base-side metal member, and an intermediate portion located between the one end and the other end fixed to a fourth central fixing portion provided on the lens holding member;A lens driving device characterized in that, when viewed in a plane along the optical axis direction, the first central fixing portion is arranged between the first base side metal member and the second base side metal member, the second central fixing portion is arranged between the third base side metal member and the fourth base side metal member, the third central fixing portion is arranged between the fifth base side metal member and the sixth base side metal member, and the fourth central fixing portion is arranged between the seventh base side metal member and the eighth base side metal member.

2. A lens driving device as described in claim 1, wherein the first central fixing portion is constituted by a first lens side metal member made of metal, the second central fixing portion is constituted by a second lens side metal member made of metal, the third central fixing portion is constituted by a third lens side metal member made of metal, and the fourth central fixing portion is constituted by a fourth lens side metal member made of metal.

3. The first base side metal member, the second base side metal member, and the first lens side metal member are each made of a metal plate having a plate-like base, and the plate surfaces of the bases constituting the first base side metal member, the second base side metal member, and the first lens side metal member are approximately parallel to each other, the third base side metal member, the fourth base side metal member, and the second lens side metal member are each made of a metal plate having a plate-like base, and the plate surfaces of the bases constituting the third base side metal member, the fourth base side metal member, and the second lens side metal member are approximately parallel to each other, the fifth base side metal member, the sixth base side metal member, and the third lens side metal member are each made of a metal plate having a plate-like base, and the plate surfaces of the bases constituting the fifth base side metal member, the sixth base side metal member, and the third lens side metal member are approximately parallel to each other, 3. The lens driving device according to claim 2, wherein each of the seventh base side metal member, the eighth base side metal member, and the fourth lens side metal member is made of a metal plate having a plate-shaped base, and the plate surfaces of each base constituting each of the seventh base side metal member, the eighth base side metal member, and the fourth lens side metal member are approximately parallel to each other.

4. A lens driving device as described in claim 3, wherein the first base side metal member, the third base side metal member, the fifth base side metal member, and the seventh base side metal member have the same shape and size, the second base side metal member, the fourth base side metal member, the sixth base side metal member, and the eighth base side metal member have the same shape and size, and the first lens side metal member, the second lens side metal member, the third lens side metal member, and the fourth lens side metal member have the same shape and size.

5. A lens driving device as described in claim 3 or claim 4, wherein the plate surfaces of each base constituting the first base side metal member, the second base side metal member, the third base side metal member, the fourth base side metal member, the fifth base side metal member, the sixth base side metal member, the seventh base side metal member, the eighth base side metal member, the first lens side metal member, the second lens side metal member, the third lens side metal member, and the fourth lens side metal member are approximately perpendicular to the optical axis direction.

6. A lens driving device as described in claim 5, wherein the first base side metal member, the first lens side metal member, and the second base side metal member are offset to the same side in the second direction relative to the fourth base side metal member, the second lens side metal member, and the third base side metal member, respectively, and the fifth base side metal member, the third lens side metal member, and the sixth base side metal member are offset to the same side in the second direction relative to the eighth base side metal member, the fourth lens side metal member, and the seventh base side metal member, respectively.

7. A lens driving device as described in claim 6, wherein, in a plan view along the optical axis direction, the first central fixed portion and the second central fixed portion are arranged adjacent to each other, and, in a plan view along the optical axis direction, the third central fixed portion and the fourth central fixed portion are arranged adjacent to each other.

8. The first base side metal member, the second base side metal member, and the first lens side metal member each have a first wire fixing portion, the third base side metal member, the fourth base side metal member, and the second lens side metal member each have a second wire fixing portion, the fifth base side metal member, the sixth base side metal member, and the third lens side metal member each have a third wire fixing portion, the seventh base side metal member, the eighth base side metal member, and the fourth lens side metal member each have a fourth wire fixing portion, a line connecting the first wire fixing portion of the first base side metal member and the third wire fixing portion of the fifth base side metal member, a line connecting the first wire fixing portion of the second base side metal member and the third wire fixing portion of the sixth base side metal member, a line connecting the second wire fixing portion of the third base side metal member and the fourth wire fixing portion of the seventh base side metal member, and The lens driving device according to claim 5 , wherein each of the lines connecting the second wire fixing portion of the fourth base side metal member and the fourth wire fixing portion of the eighth base side metal member passes through the optical axis.

9. A lens driving device as described in claim 3 or claim 4, wherein the plate surfaces of each base constituting the first base side metal member, the second base side metal member, the third base side metal member, the fourth base side metal member, the fifth base side metal member, the sixth base side metal member, the seventh base side metal member, the eighth base side metal member, the first lens side metal member, the second lens side metal member, the third lens side metal member, and the fourth lens side metal member are approximately perpendicular to the first direction.

10. A lens driving device as described in claim 9, wherein the base of the metal member arranged on the outside of the first lens side metal member and the second lens side metal member is located between the first wire and the second wire, and the base of the metal member arranged on the outside of the third lens side metal member and the fourth lens side metal member is located between the third wire and the fourth wire.

11. The first base-side metal member, the second base-side metal member, and the first lens-side metal member each have a first wire fixing portion, the third base-side metal member, the fourth base-side metal member, and the second lens-side metal member each have a second wire fixing portion, at least a portion of the first base-side metal member and the fourth base-side metal member are at the same position in the second direction, at least a portion of the second base-side metal member and the third base-side metal member are at the same position in the second direction, at least a portion of the first lens-side metal member and the second lens-side metal member are at the same position in the second direction, the first wire fixing portion of the first base-side metal member and the second wire fixing portion of the fourth base-side metal member, the first wire fixing portion of the first lens-side metal member and the second wire fixing portion of the second lens-side metal member, and the first wire fixing portion of the second base-side metal member and the second wire fixing portion of the third base-side metal member are each at the same position in the second direction. The lens driving device according to claim 9 .

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