Lens driving device and camera module

Abstract

To suppress the occurrence of issues concerning the holding of a shape memory alloy wire.SOLUTION: A lens driving device 101 comprises a shape memory alloy wire SA including a first wire SA1. The first wire SA1 has one end portion fixed to a first base-side metal member 5F1 and the other end portion fixed to a second base-side metal member 5F2. An intermediate portion of the first wire SA1, located between the one end portion and the other end portion of the first wire SA1, is fixed to a first central fixing portion CF1 provided on a lens holding member 2. The first central fixing portion CF1 is arranged between the first base-side metal member 5F1 and the second base-side metal member 5F2 in a plan view along an optical axis direction, and the intermediate portion of the first wire SA1 is arranged at a position different from each of the one end portion and the other end portion of the first wire SA1 in the optical axis direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, a camera device (lens driving device) configured to move a camera unit (lens holding member) relative to a support structure (base member) by a shape memory alloy wire is known (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 lens holding member, and an intermediate portion between the one end and the other end is hooked onto a hook provided on the base member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2010-089529 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with this lens driving device, when the length of the shape memory alloy wire changes as electricity is passed through it, the middle part of the shape memory alloy wire may slide on the hook, generating wear powder, or if the lens driving device is subjected to a strong impact, such as being dropped, the middle part of the shape memory alloy wire may come off the holding element, which may cause problems with the retention of the shape memory alloy wire.

[0005] Therefore, it is desirable to provide a lens driving device that can prevent problems related to the retention of the shape memory alloy wire. [Means for solving the problem]

[0006] A lens driving device according to one embodiment of the present disclosure comprises 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 an optical axis direction, wherein the shape memory alloy wire includes a first wire, and the base member is provided with a first base side metal member and a second base side metal member that are arranged spaced apart in a first direction that intersects the optical axis direction, and the first wire has one end fixed to the first base side metal member and the other end fixed to the second base side metal member, and an intermediate portion of the first wire located between one end and the other end of the first wire is fixed to a first central fixing portion provided on the lens holding member, and the first central fixing portion is arranged between the first base side metal member and the second base side metal member in a planar view along the optical axis direction, and the intermediate portion of the first wire is arranged at a position different from each of the one end and the other end of the first wire in the optical axis direction. [Effects of the Invention]

[0007] The above-described lens driving device can suppress the occurrence of problems relating to the retention of the shape memory alloy wire. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a camera module including a lens driving device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is an exploded perspective view of the lens driving device shown in FIG. [Figure 3] 2 is a perspective view of a lens holding member, a lens side metal member, a leaf spring, a lens side embedded member, and a position detection magnet. FIG. [Figure 4] FIG. 2 is a perspective view of a lens holding member and a position detection magnet. [Figure 5] 1 is a perspective view of a base member, a magnet, a base-side metal member, a supported-side metal member, a leaf spring, a flexible metal member, and a base-side embedded member. FIG. [Figure 6]2 is a perspective view of a base member, a magnet, a supported metal member, a flexible metal member, a support-side embedded member, and a base-side embedded member. FIG. [Figure 7] 2 is a perspective view of a support-side metal member, a flexible metal member, a support member, a support-side embedded member, and a magnetic member. FIG. [Figure 8] FIG. 2 is a perspective view of a support-side metal member, a support member, a support-side embedded member, and a magnetic member. [Figure 9] 10A and 10B are diagrams showing examples of the configuration of a base-side metal member, a lens-side metal member, and a shape memory alloy wire. [Figure 10] 1 is a perspective view of a base-side metal member, a lens-side metal member, a support-side metal member, a supported-side metal member, a flexible metal member, a support-side embedded member, a base-side embedded member, and a shape memory alloy wire. [Figure 11] 1 is a perspective view of a base-side metal member, a lens-side metal member, a flexible metal member, a support-side embedded member, a base-side embedded member, and a shape memory alloy wire. [Figure 12] 1 is a perspective view of a supporting metal member, a supported metal member, a flexible metal member, a supporting embedded member, a base embedded member, and a shape memory alloy wire. FIG. [Figure 13] FIG. 2 is a top view of the first drive unit. [Figure 14] 3A and 3B are a bottom view and a cross-sectional view of a base member, a support member, and a second drive unit. [Figure 15] FIG. 10 is a perspective view of another configuration example of the lens driving device according to the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[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 Cartesian 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 Cartesian 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 Cartesian 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 (imaging element 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 imaging element 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 attached to the substrate SU on which the imaging element IS is mounted, as shown in Fig. 1.

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

[0013] Specifically, as shown in FIG. 2, the cover member 1 has a bottomless box-like outer shape that defines the storage section 1S. Specifically, the 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 cover member 1, the support member 8, and the magnetic member 10 are bonded together with an adhesive to form the housing HS, as shown in FIG. 1.

[0014] As shown in Figure 2, between the cover member 1 and the magnetic member 10, a lens holding member 2, a base member 3, a magnet 4, a metal member 5, a leaf spring 6, a flexible metal member 7, a support member 8, a support side embedded member 9, a lens side embedded member 20, a base side embedded member 30, a position detection magnet MG, a shape memory alloy wire SA, and a shape memory alloy wire SB 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 includes a first pedestal portion 2D1 to a fourth pedestal portion 2D4. The first pedestal portion 2D1 and the third pedestal portion 2D3 are arranged to extend in opposite directions in the radial direction (X-axis direction) across the optical axis OA, and the second pedestal portion 2D2 and the fourth pedestal portion 2D4 are arranged to extend in opposite directions in the radial direction (Y-axis direction) across the optical axis OA. A portion of a leaf spring 6 is placed on each of the second pedestal portion 2D2 and the fourth pedestal portion 2D4. Furthermore, a lens side metal member 5M is placed on each of the first to fourth pedestal portions 2D1 to 2D4.

[0017] The driving unit DM is configured to be able to move the movable member MB relative to the fixed member FB. In the illustrated example, the driving unit DM includes a shape memory alloy wire, which is an example of a shape memory actuator. Specifically, the driving unit DM includes a first driving unit DM1 for moving the lens holding member 2 relative to the base member 3, and a second driving unit DM2 for moving the base member 3 relative to the support member 8. The first driving unit DM1 includes a shape memory alloy wire SA, and the second driving unit DM2 includes a shape memory alloy wire SB. The shape memory alloy wire SA includes a first wire SA1 to a fourth wire SA4, and the shape memory alloy wire SB includes a first wire SB1 to a fourth wire SB4.

[0018] The shape memory alloy wire 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 peripheral wall portion 1A of the cover member 1 when a current is supplied, so that the lens holding member 2 can be moved relative to the base member 3. 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 is fixed to the lens side metal member 5M by crimping, welding, or the like. As shown in FIG. 2, the shape memory alloy wire SB is stretched in a straight line along each side of the support member 8 when a current is supplied, so that the base member 3 can be moved relative to the support member 8. Each of the first wire SB1 to the fourth wire SB4 has one end fixed to the supported metal member 5N by crimping, welding, or the like, and the other end fixed to the supporting metal member 5G by crimping, welding, or the like.

[0019] In the illustrated example, the first wire SA1 and the second wire SA2, the second wire SA2 and the third wire SA3, the third wire SA3 and the fourth wire SA4, the fourth wire SA4 and the first wire SA1, the first wire SB1 and the second wire SB2, the second wire SB2 and the third wire SB3, the third wire SB3 and the fourth wire SB4, and the fourth wire SB4 and the first wire SB1 are arranged so as to intersect (approximately perpendicular to) each other when viewed along the optical axis direction (Z-axis direction). Note that the intersection of two shape memory alloy wires means that a straight line passing through one end and the other end of one shape memory alloy wire intersects with a straight line passing through one end and the other end of the other shape memory alloy wire.

[0020] The first driving unit DM1 can use the contraction of the shape memory alloy wire 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 wire SA is 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 elongates one or more of the other wires. Similarly, the second driving unit DM2 can use the contraction of the shape memory alloy wire SB to move the base member 3 (including the lens holding member 2) left and right along a first direction (Y-axis direction) perpendicular to the optical axis OA, and can also use the contraction of the shape memory alloy wire SB to move the base member 3 (including the lens holding member 2) back and forth along a second direction (X-axis direction) perpendicular to both the optical axis OA and the first direction. The shape memory alloy wire SB is configured so that when one or more of the first wire SB1 to fourth wire SB4 contract, the base member 3 moves, and this movement elongates one or more of the other wires.

[0021] The base member 3 is a member that is movable in the X-axis direction and the Y-axis direction relative to the fixed member FB (support member 8), and constitutes the movable member MB. In the illustrated example, the base member 3 is formed by injection molding using a synthetic resin such as liquid crystal polymer (LCP). Specifically, the base member 3 has a substantially rectangular outer shape in a plan view (top view) and has a substantially circular opening 3K in the center. Specifically, the base member 3 has a rectangular annular main body portion 3B formed to surround the opening 3K, and a pedestal portion 3D that protrudes upward from the main body portion 3B. The pedestal portion 3D includes a first pedestal portion 3D1 to a fourth pedestal portion 3D4. The first pedestal portion 3D1 and the third pedestal portion 3D3 are disposed to face each other in the radial direction across the optical axis OA, and the second pedestal portion 3D2 and the fourth pedestal portion 3D4 are disposed to face each other in the radial direction across the optical axis OA. More specifically, the main body 3B includes four sides 3E (first side 3E1 to fourth side 3E4), with a first pedestal 3D1 provided between the fourth side 3E4 and the first side 3E1, a second pedestal 3D2 provided between the first side 3E1 and the second side 3E2, a third pedestal 3D3 provided between the second side 3E2 and the third side 3E3, and a fourth pedestal 3D4 provided between the third side 3E3 and the fourth side 3E4. A portion of the leaf spring 6 is placed on each of the second pedestal 3D2 and the fourth pedestal 3D4. A base-side metal member 5F is placed on each of the first pedestal 3D1 to fourth pedestal 3D4.

[0022] The magnet 4 is a member that cooperates with magnetic members fixed to the lens holding member 2 and the support member 8, respectively, to prevent the base member 3 from separating from the lens holding member 2 and the support member 8, respectively. Specifically, the magnet 4 is attached to the base member 3 so as to be magnetically attracted to the lens-side magnetic member MP embedded in the lens holding member 2 as shown in FIG. 3, and so as to be magnetically attracted to the magnetic member 10 adhesively fixed to the support member 8 as shown in FIG. 1. In the illustrated example, the magnet 4 is a permanent magnet that is bipolarly magnetized along the Z-axis direction, and includes a first magnet 41 and a second magnet 42.

[0023] 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, a lens-side metal member 5M, a support-side metal member 5G, and a supported-side metal member 5N. The base-side metal member 5F is configured so as to be fixed to the pedestal portion 3D of the base member 3. 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 support-side metal member 5G is configured so as to be fixed to the underside of the support member 8. The supported-side metal member 5N is configured so as to be fixed to a protrusion 3T (see FIG. 6 ) that protrudes downward from the underside of the base member 3. The base-side metal member 5F may be embedded in the pedestal portion 3D of the base member 3, and the lens-side metal member 5M may be embedded in the pedestal portion 2D of the lens holding member 2. The supporting metal member 5G may be embedded in the lower surface of the supporting member 8, and the supported metal member 5N may be embedded in the protruding portion 3T of the base member 3.

[0024] More specifically, the base-side metal member 5F includes a first base-side metal member 5F1 to an eighth base-side metal member 5F8, the lens-side metal member 5M includes a first lens-side metal member 5M1 to a fourth lens-side metal member 5M4, the support-side metal member 5G includes a first support-side metal member 5G1 to a fourth support-side metal member 5G4, and the supported-side metal member 5N includes a first supported-side metal member 5N1 and a second supported-side metal member 5N2.

[0025] The leaf spring 6 is configured to support the lens holding member 2 relative to the base member 3 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 and the base member 3 so that the center of the lens holding member 2 and the center of the base member 3 coincide with each other 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 3 in the XY plane. Specifically, the leaf spring 6 is configured to connect the pedestal portion 2D (second pedestal portion 2D2 and fourth pedestal portion 2D4) formed on the lens holding member 2 to the pedestal portion 3D (second pedestal portion 3D2 and fourth pedestal portion 3D4) formed on the base member 3. The neutral state of the lens driving device 101 is, for example, a state in which current is supplied to each of the first wire SA1 to the fourth wire SA4 and the first wire SB1 to the fourth wire SB4, and the movable member MB (lens holding member 2 and base member 3) is located in the middle of the movable range in each of 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 and base member 3) is in a neutral position. Typically, in the neutral state of the lens driving device 101, the lens holding member 2 is located in the middle of the movable range in each of the three axes, and the base member 3 is located in the middle of the movable range in each of the two axes (X-axis and Y-axis).

[0026] The flexible metal member 7 is a member for supplying current to each of the shape memory alloy wires SA and SB. Specifically, the flexible metal member 7 has a fixed joint portion fixed to the support member 8, a movable joint portion fixed to the base member 3, and an elastically deformable elastic arm portion connecting the fixed joint portion and the movable joint portion. In the illustrated example, the flexible metal member 7 includes a first flexible metal member 7A to an eighth flexible metal member 7H.

[0027] The support member 8 is a member for supporting the movable member MB and constitutes the fixed member FB. In the illustrated example, the support member 8 is formed by injection molding using a synthetic resin such as liquid crystal polymer (LCP). Specifically, the support member 8 has a substantially rectangular outer shape in a plan view (top view) and has a substantially circular opening 8K in the center. The support member 8 also has a rectangular annular base 8B formed to surround the opening 8K.

[0028] Furthermore, the support member 8 has a through-hole 8T (through-hole 8T through which at least a part of the protrusion 3T is inserted) in which the protrusion 3T (see FIG. 6) of the base member 3 is arranged. In the illustrated example, the support member 8 includes a first through-hole 8T1 in which the first protrusion 3T1 is arranged, and a second through-hole 8T2 in which the second protrusion 3T2 is arranged. This configuration has the effect of realizing a lens driving device 101 including a second driving unit DM2 (shape memory alloy wire SB) arranged on the underside of the support member 8 with a simple structure. Specifically, this configuration has the effect of realizing assembly of the supported metal member 5N constituting the second driving unit DM2 to the base member 3 with a simple structure.

[0029] The support-side embedded members 9 are metal members embedded in the support member 8. Specifically, the support-side embedded members 9 have terminal portions used for electrical connection to the outside, and joining portions exposed on the surface of the support member 8 and used for joining to other metal members. In the illustrated example, the support-side embedded members 9 include a first support-side embedded member 9A to a twelfth support-side embedded member 9L, as shown in FIG. 6.

[0030] The lens side buried member 20 is a metal member embedded in the lens holding member 2. Specifically, the lens side buried member 20 has a joining portion that is exposed on the surface of the lens holding member 2 and is used for joining to other metal members. In the illustrated example, the lens side buried member 20 includes a first lens side buried member 20A to an eighth lens side buried member 20H, as shown in FIG. 3. In addition, the fourth lens side buried member 20D and the eighth lens side buried member 20H function as lens side magnetic members MP that cooperate with the magnet 4.

[0031] The lens-side magnetic member MP (see FIG. 3 ) is a member for positioning the lens holding member 2 at a predetermined position relative to the base member 3. Specifically, the lens-side magnetic member MP is embedded in the lens holding member 2 so that the attractive force acting between the lens-side magnetic member MP and the magnet 4 fixed to the base member 3 attracts the lens holding member 2 (lens-side magnetic member MP) to the base member 3 (magnet 4), thereby centering the lens holding member 2 in the XY plane. In the illustrated example, the lens-side magnetic member MP is a metal plate made of a magnetic metal. However, the lens-side magnetic member MP may also be a magnet, or may be made of a magnetic resin material or the like as long as it can generate a magnetic attractive force between the lens-side magnetic member MP and the magnet 4.

[0032] The base-side embedded member 30 is a metal member embedded in the base member 3. Specifically, the base-side embedded member 30 has a wire-side joining portion exposed on the surface of the base member 3 and used for joining with the metal member 5, and a lower-side joining portion exposed on the lower surface of the base member 3 and used for joining with the flexible metal member 7. In the illustrated example, the base-side embedded member 30 includes a first base-side embedded member 30A to an eighth base-side embedded member 30H, as shown in FIG.

[0033] The position detecting magnet MG is a member that cooperates with a magnetic sensor (not shown) mounted on the substrate SU to enable detection of the position of the lens holding member 2. Specifically, the position detecting magnet MG is provided on the lens holding member 2 so as to face the magnetic sensor mounted on the substrate SU. In the illustrated example, the position detecting magnet MG is a permanent magnet that is bipolarly magnetized along the Z-axis direction, and includes a first position detecting magnet MG1 and a second position detecting magnet MG2.

[0034] The magnetic member 10 cooperates with the magnet 4 fixed to the base member 3 to prevent the base member 3 from separating from the support member 8. In the illustrated example, the magnetic member 10 is a rectangular, annular, flat metal plate made of a magnetic metal. However, the magnetic member 10 may be a magnet, or may be made of a magnetic resin material or the like as long as it can generate a magnetic attractive force between the magnetic member 10 and the magnet 4. The magnetic member 10 may also be embedded in the support member 8 by insert molding or the like. Specifically, the magnetic member 10 has a substantially rectangular outer shape in a plan view (top view) and has a substantially circular opening 10K in the center.

[0035] 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 Figures 3 and 4. Figure 3 is an upper perspective view of the lens holding member 2, lens side metal member 5M, leaf spring 6, lens side embedded member 20, and position detection magnet MG. Specifically, the upper view of Figure 3 (the view above the block arrow) is an exploded perspective view, and the lower view of Figure 3 (the view below the block arrow) is an assembled perspective view. Figure 4 is a lower perspective view of the lens holding member 2 and position detection magnet MG.

[0036] 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 two angular protrusions 2V formed on the upper surface of the first pedestal portion 2D1 protruding upward (toward the Z1 side) and formed in the first pedestal portion 2D1 engaging with two rectangular holes AH formed in the first lens side metal member 5M1. 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.

[0037] The leaf spring 6 has a base side portion 6B fixed to the pedestal portion 3D (see FIG. 2) of the base member 3, a lens side portion 6L fixed to the pedestal portion 2D of the lens holding member 2, and an elastic portion 6G connecting the base side portion 6B and the lens side portion 6L. Specifically, the base side portion 6B includes a first base side portion 6B1 and a second base side portion 6B2, the lens side portion 6L includes a first lens side portion 6L1 and a second lens side portion 6L2, 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 lens side portion 6L1 and the first base side portion 6B1, the second elastic portion 6G2 connects the first lens side portion 6L1 and the second base side portion 6B2, the third elastic portion 6G3 connects the second lens side portion 6L2 and the second base side portion 6B2, and the fourth elastic portion 6G4 connects the second lens side portion 6L2 and the first base side portion 6B1.

[0038] The first lens side portion 6L1 is formed with a first through-hole 6H1 through which a round protrusion 2P formed on the upper surface of the second pedestal portion 2D2 protruding upward is inserted. The second lens side portion 6L2 is formed with a second through-hole 6H2 through which a round protrusion 2P formed on the upper surface of the fourth pedestal portion 2D4 protruding upward is inserted. In the illustrated example, the leaf spring 6 and the protrusion 2P are joined with an adhesive. However, the leaf spring 6 and the protrusion 2P may also be joined by applying heat or cold caulking to the protrusion 2P.

[0039] Similarly, the first base side portion 6B1 is formed with a third through-hole 6H3 through which a round protrusion 3P (see FIG. 5) formed on the upper surface of the second pedestal portion 3D2 (see FIG. 5) protruding upward is inserted. The second base side portion 6B2 is also formed with a fourth through-hole 6H4 through which a round protrusion 3P (see FIG. 5) formed on the upper surface of the fourth pedestal portion 3D4 protruding upward is inserted. In the illustrated example, the leaf spring 6 and the protrusion 3P are joined with an adhesive. However, the leaf spring 6 and the protrusion 3P may also be joined by hot or cold caulking the protrusion 3P.

[0040] 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 four shape memory alloy wires SA (first wire SA1 to fourth wire SA4).

[0041] The first lens side buried member 20A has a first bonding portion 20AP exposed on the upper surface of the first pedestal portion 2D1, and the second lens side buried member 20B has a second bonding portion 20BP exposed on the upper surface of the first pedestal portion 2D1. The first bonding portion 20AP and the second bonding portion 20BP are each bonded to the first lens side metal member 5M1 by welding. Note that the first bonding portion 20AP and the second bonding portion 20BP may also be bonded to the first lens side metal member 5M1 using an adhesive, solder, or the like. The same is true for the bonding between the third bonding portion 20CP of the third lens side buried member 20C and the fourth bonding portion 20DP of the fourth lens side buried member 20D, which are exposed on the upper surface of the second base portion 2D2, and the second lens side metal member 5M2; the bonding between the fifth bonding portion 20EP of the fifth lens side buried member 20E and the sixth bonding portion 20FP of the sixth lens side buried member 20F, which are exposed on the upper surface of the third base portion 2D3, and the third lens side metal member 5M3; and the bonding between the seventh bonding portion 20GP of the seventh lens side buried member 20G and the eighth bonding portion 20HP of the eighth lens side buried member 20H, which are exposed on the upper surface of the fourth base portion 2D4, and the fourth lens side metal member 5M4.

[0042] 4, the third lens side buried member 20C has a third exposed portion 20CQ exposed at the bottom surface of the second pedestal portion 2D2, and the fourth lens side buried member 20D has a fourth exposed portion 20DQ exposed at the bottom surface of the second pedestal portion 2D2. Similarly, although not visible in FIG. 4, the seventh lens side buried member 20G has a seventh exposed portion 20GQ exposed at the bottom surface of the fourth pedestal portion 2D4, and the eighth lens side buried member 20H has an eighth exposed portion 20HQ exposed at the bottom surface of the fourth pedestal portion 2D4.

[0043] 4, a housing portion 2R that opens downward (in the Z2 direction) is formed on the lower surface of the lens holding member 2. A position-detecting magnet MG is housed in the housing portion 2R and fixed therein with an adhesive. Specifically, the housing portion 2R includes a first housing portion 2R1 and a second housing portion 2R2. A first position-detecting magnet MG1 is housed in the first housing portion 2R1, and a second position-detecting magnet MG2 is housed in the second housing portion 2R2.

[0044] Next, the positional relationship between the base member 3 and the members that come into contact with the base member 3 will be described with reference to Figures 5 and 6. Figure 5 is an upper perspective view of the base member 3, magnet 4, base-side metal member 5F, supported-side metal member 5N, leaf spring 6, flexible metal member 7, and base-side embedded member 30. Specifically, the upper view of Figure 5 (the view above the block arrow) is an exploded perspective view, and the lower view of Figure 5 (the view below the block arrow) is an assembled perspective view. Figure 6 is a lower perspective view of the base member 3, magnet 4, supported-side metal member 5N, flexible metal member 7, support-side embedded member 9, and base-side embedded member 30.

[0045] As shown in Fig. 6, a housing portion 3R that opens downward (in the Z2 direction) is formed on the lower surface of the base member 3. A magnet 4 is housed in the housing portion 3R and fixed therein with an adhesive. Specifically, the housing portion 3R includes a first housing portion 3R1 and a second housing portion 3R2. A first magnet 41 is housed in the first housing portion 3R1, and a second magnet 42 is housed in the second housing portion 3R2.

[0046] 5, the second base-side metal member 5F2 is fixed to the upper mounting surface of the second pedestal portion 3D2 of the base member 3, and the third base-side metal member 5F3 is fixed to the lower mounting surface of the second pedestal portion 3D2 of the base member 3. Specifically, the second base-side metal member 5F2 is fixed to the upper mounting surface of the second pedestal portion 3D2 with an adhesive when a rectangular protrusion 3U formed on the upper mounting surface of the second pedestal portion 3D2 protruding upward (toward the Z1 side) is engaged with a rectangular hole RH formed in the second base-side metal member 5F2. The third base-side metal member 5F3 is fixed to the lower mounting surface of the second pedestal portion 3D2 with an adhesive when a rectangular protrusion 3V formed on the lower mounting surface of the second pedestal portion 3D2 protruding upward (toward the Z1 side) is engaged with a rectangular hole RH formed in the third base-side metal member 5F3. Similarly, the first base-side metal member 5F1 is fixed to the upper mounting surface of the first pedestal portion 3D1 of the base member 3, the fourth base-side metal member 5F4 is fixed to the lower mounting surface of the third pedestal portion 3D3 of the base member 3, the fifth base-side metal member 5F5 is fixed to the upper mounting surface of the third pedestal portion 3D3 of the base member 3, the sixth base-side metal member 5F6 is fixed to the upper mounting surface of the fourth pedestal portion 3D4 of the base member 3, the seventh base-side metal member 5F7 is fixed to the lower mounting surface of the fourth pedestal portion 3D4 of the base member 3, and the eighth base-side metal member 5F8 is fixed to the lower mounting surface of the first pedestal portion 3D1 of the base member 3. In this manner, each of the first to fourth pedestal portions 3D1 to 3D4 has an upper mounting surface and a lower mounting surface. The upper and lower mounting surfaces are surfaces perpendicular to the optical axis OA.

[0047] The first to eighth flexible metal members 7A to 7H have first to eighth movable joints 7AQ to 7HQ, respectively. As shown in Fig. 6, each of the first to eighth movable joints 7AQ to 7HQ has a through-hole formed therein through which a round protrusion 3Q formed on the underside of the base member 3 and protruding downward is inserted. In the illustrated example, the flexible metal members 7 and the base member 3 are joined with an adhesive. However, the flexible metal members 7 and the base member 3 may also be joined by applying heat or cold caulking to the protrusion 3Q.

[0048] As shown in FIG. 6, a protrusion 3T is formed on the underside of the base member 3, protruding downward. The protrusion 3T includes a first protrusion 3T1 protruding downward from the second pedestal portion 3D2 and a second protrusion 3T2 protruding downward from the fourth pedestal portion 3D4. The first supported metal member 5N1 has two through holes through which two protruding protrusions 3W formed on the underside of the first protrusion 3T1 are inserted. The first supported metal member 5N1 and the protrusions 3W are bonded together using an adhesive. However, the first supported metal member 5N1 and the protrusions 3W may also be bonded together by thermal or cold caulking the protrusions 3W. The same applies to the bond between the second supported metal member 5N2 and the protrusions 3W formed on the second protrusion 3T2.

[0049] The first base-side buried member 30A has a first wire-side bonding portion 30AP exposed on the upper mounting surface of the first pedestal portion 3D1 of the base member 3, and a first base-side bonding portion 30AQ exposed on the lower surface of the first side portion 3E1 of the base member 3. The second base-side buried member 30B has a second wire-side bonding portion 30BP exposed on the lower mounting surface of the third pedestal portion 3D3 of the base member 3, and a second base-side bonding portion 30BQ exposed on the lower surface of the second side portion 3E2 of the base member 3. The third base-side buried member 30C has a third wire-side bonding portion 30CP exposed on the upper mounting surface of the third pedestal portion 3D3 of the base member 3, and a third base-side bonding portion 30CQ exposed on the lower surface of the third side portion 3E3 of the base member 3. The fourth base-side embedded member 30D has a fourth wire-side joint 30DP exposed on the lower mounting surface of the first pedestal portion 3D1 of the base member 3, and a fourth base-side joint 30DQ exposed on the lower surface of the fourth side portion 3E4 of the base member 3. The fifth base-side embedded member 30E has a fifth upper wire-side joint 30EP1 exposed on the upper mounting surface of the second pedestal portion 3D2 of the base member 3, a fifth lower wire-side joint 30EP2 exposed on the lower mounting surface of the second pedestal portion 3D2 of the base member 3, and a fifth base-side joint 30EQ exposed on the lower surface of the second side portion 3E2 of the base member 3. The sixth base-side embedded member 30F has a sixth upper wire-side joint 30FP1 exposed on the upper mounting surface of the fourth pedestal portion 3D4 of the base member 3, a sixth lower wire-side joint 30FP2 exposed on the lower mounting surface of the fourth pedestal portion 3D4 of the base member 3, and a sixth base-side joint 30FQ exposed on the lower surface of the fourth side portion 3E4 of the base member 3. The seventh base-side embedded member 30G has a seventh wire-side joint 30GP exposed on the lower surface of the first protrusion 3T1 of the base member 3 and a seventh base-side joint 30GQ exposed on the lower surface of the second pedestal portion 3D2 of the base member 3. The eighth base-side embedded member 30H has an eighth wire-side joint 30HP exposed on the lower surface of the second protrusion 3T2 of the base member 3 and an eighth base-side joint 30HQ exposed on the lower surface of the fourth pedestal portion 3D4 of the base member 3.

[0050] The first wire-side joint portion 30AP and the first base-side metal member 5F1 are joined by welding. The first wire-side joint portion 30AP and the first base-side metal member 5F1 may be joined by an adhesive, solder, or the like. The same is true for the joining between the second wire side joint 30BP and the fourth base side metal member 5F4, the joining between the third wire side joint 30CP and the fifth base side metal member 5F5, the joining between the fourth wire side joint 30DP and the eighth base side metal member 5F8, the joining between the fifth upper wire side joint 30EP1 and the second base side metal member 5F2, the joining between the fifth lower wire side joint 30EP2 and the third base side metal member 5F3, the joining between the sixth upper wire side joint 30FP1 and the sixth base side metal member 5F6, the joining between the sixth lower wire side joint 30FP2 and the seventh base side metal member 5F7, the joining between the seventh wire side joint 30GP and the first supported side metal member 5N1, and the joining between the eighth wire side joint 30HP and the second supported side metal member 5N2.

[0051] Each of the first to eighth movable joints 7AQ to 7HQ has a rounded rectangular through-hole formed therein for use in welding. The first movable joint 7AQ and the first base-side joint 30AQ of the first base-side buried member 30A are joined by welding. However, the first movable joint 7AQ and the first base-side joint 30AQ of the first base-side buried member 30A may also be joined by a conductive adhesive, solder, or the like. The same is true for the joint between the second movable joint 7BQ and the second base side joint 30BQ, the joint between the third movable joint 7CQ and the third base side joint 30CQ, the joint between the fourth movable joint 7DQ and the fourth base side joint 30DQ, the joint between the fifth movable joint 7EQ and the fifth base side joint 30EQ, the joint between the sixth movable joint 7FQ and the sixth base side joint 30FQ, the joint between the seventh movable joint 7GQ and the seventh base side joint 30GQ, and the joint between the eighth movable joint 7HQ and the eighth base side joint 30HQ.

[0052] The supported metal member 5N is fixed to the lower end surface of the protruding portion 3T of the base member 3. Specifically, the first supported metal member 5N1 is fixed to the lower end surface of the first protruding portion 3T1, and the second supported metal member 5N2 is fixed to the lower end surface of the second protruding portion 3T2. More specifically, the first supported metal member 5N1 has two through holes through which the two protrusions 3W formed on the lower end surface of the first protruding portion 3T1 are inserted. The first supported metal member 5N1 and the first protruding portion 3T1 are joined using an adhesive. However, the first supported metal member 5N1 and the first protruding portion 3T1 may also be joined by applying heat or cold caulking to the protrusions 3W. The first supported metal member 5N1 also has a rounded rectangular through hole formed therein for use in welding. The first supported metal member 5N1 and the seventh wire-side joint 30GP exposed on the underside of the first protrusion 3T1 are joined by welding. However, the first supported metal member 5N1 and the seventh wire-side joint 30GP may also be joined by a conductive adhesive or the like. The same applies to the joint between the second supported metal member 5N2 and the eighth wire-side joint 30HP.

[0053] Next, the positional relationship between the support member 8 and the members attached to the support member 8 will be described with reference to Figures 7 and 8. Figure 7 is an upper perspective view of the support-side metal member 5G, flexible metal member 7, support member 8, support-side embedded member 9, and magnetic member 10. Specifically, the upper view of Figure 7 (the view above the block arrow) is an exploded perspective view, and the lower view of Figure 7 (the view below the block arrow) is an assembled perspective view. Figure 8 is a lower perspective view of the support-side metal member 5G, support member 8, support-side embedded member 9, and magnetic member 10. Note that the magnetic member 10 is adhesively fixed to the support member 8 so as not to come into contact with either the support-side metal member 5G or the supported-side metal member 5N.

[0054] As shown in Fig. 7, the first to eighth flexible metal members 7A to 7H have a first to eighth fixed joint portion 7AP to 7HP, respectively. Furthermore, the first to twelfth support-side buried members 9A to 9L have a first to twelfth terminal portion 9AT to 9LT, respectively, as well as a first to twelfth joint portion 9AP to 9LP, as shown in Fig. 7. The first to eighth joint portions 9AP to 9HP are exposed on the upper surface of the support member 8 (base portion 8B), and the ninth to twelfth joint portions 9IP to 9LP are exposed on the lower surface of the support member 8.

[0055] Each of the first to eighth fixed joints 7AP to 7HP has a through-hole through which a round protrusion 8P formed on the upper surface of the support member 8 protruding upward is inserted. In the illustrated example, the flexible metal member 7 (first fixed joint 7AP) and the support member 8 (protrusion 8P) are joined by an adhesive. However, the flexible metal member 7 (first fixed joint 7AP) and the support member 8 (protrusion 8P) may also be joined by thermally or cold-caulking the protrusion 8P. The same applies to the second to eighth fixed joints 7BP to 7HP.

[0056] Each of the first to eighth fixed joints 7AP to 7HP has a rounded rectangular through-hole formed therein for use in welding. The first fixed joint 7AP and the first joint 9AP are joined by welding. However, the first fixed joint 7AP and the first joint 9AP may also be joined using a conductive adhesive or the like. The same applies to the joint between the second fixed joint 7BP and the second joint 9BP, the joint between the third fixed joint 7CP and the third joint 9CP, the joint between the fourth fixed joint 7DP and the fourth joint 9DP, the joint between the fifth fixed joint 7EP and the fifth joint 9EP, the joint between the sixth fixed joint 7FP and the sixth joint 9FP, the joint between the seventh fixed joint 7GP and the seventh joint 9GP, and the joint between the eighth fixed joint 7HP and the eighth joint 9HP.

[0057] Furthermore, some of the support-side buried members 9 (the second support-side buried member 9B, the fourth support-side buried member 9D, and the ninth support-side buried member 9I) have exposed portions (the second exposed portion 9BX, the fourth exposed portion 9DX, and the ninth exposed portion 9IX) that are exposed on the upper surface of the support member 8. As shown in FIG. 6, the base member 3 has a plurality of contact portions 3C (guided portions GE) that protrude downward from the main body portion 3B and whose tip portions come into contact with guiding portions GD that are part of the exposed portions of the support-side buried members 9. In the illustrated example, the guided portion GE includes a first guided portion GE1 that contacts the upper surface of the first guide portion GD1, which is part of the second exposed portion 9BX of the second support side embedded member 9B, a second guided portion GE2 that contacts the upper surface of the second guide portion GD2, which is part of the fourth exposed portion 9DX of the fourth support side embedded member 9D, and a third guided portion GE3 that contacts the upper surface of the third guide portion GD3, which is part of the ninth exposed portion 9IX of the ninth support side embedded member 9I.

[0058] This configuration has the advantage that the support-side buried member 9 can be used as the guide portion GD when moving the base member 3 in directions perpendicular to the optical axis direction (X-axis direction and Y-axis direction). That is, this configuration has the advantage that the support-side buried member 9, which is less likely to deform than synthetic resin, can be used as the guide portion GD. Furthermore, sliding between metal (support-side buried member 9) and synthetic resin (base member 3) can prevent the synthetic resin from being worn away compared to sliding between synthetic resins. Therefore, this configuration has the advantage of making it less likely to generate wear powder.

[0059] 8, the fourth support-side metal member 5G4 is fixed to the support member 8 with an adhesive in a state in which two angular protrusions 8V formed on the underside of the support member 8 protruding downward (toward the Z2 side) engage with two rectangular holes formed in the fourth support-side metal member 5G4. However, the fourth support-side metal member 5G4 and the support member 8 may also be joined by applying heat or cold caulking to the protrusions 8V. The same applies to each of the first support-side metal member 5G1 to the third support-side metal member 5G3.

[0060] 8, the first support-side metal member 5G1 has a rounded rectangular through-hole formed therein for use in welding. The first support-side metal member 5G1 and the ninth joint 9IP of the ninth support-side buried member 9I are joined by welding. However, the first support-side metal member 5G1 and the ninth joint 9IP may also be joined using a conductive adhesive or the like. The same applies to the joint between the second support-side metal member 5G2 and the tenth joint 9JP of the tenth support-side buried member 9J, the joint between the third support-side metal member 5G3 and the eleventh joint 9KP of the eleventh support-side buried member 9K, and the joint between the fourth support-side metal member 5G4 and the twelfth joint 9LP of the twelfth support-side buried member 9L.

[0061] Next, with reference to FIG. 9, the metal member 5 to which the shape memory alloy wire SA is attached will be described. FIG. 9 is a diagram showing an example of the configuration of the base-side metal member 5F, the lens-side metal member 5M, and the shape memory alloy wire SA. Specifically, the upper view of FIG. 9 is a perspective view of the first base-side metal member 5F1 to the fourth base-side metal member 5F4, the first lens-side metal member 5M1, the second lens-side metal member 5M2, the first wire SA1, and the second wire SA2. The lower view of FIG. 9 is a view of the first base-side metal member 5F1 to the fourth base-side metal member 5F4, the first lens-side metal member 5M1, the second lens-side metal member 5M2, the first wire SA1, and the second wire SA2 as viewed from the diagonally front right side along a direction perpendicular to the optical axis OA. Note that the positional relationship of each member shown in FIG. 9 corresponds to the positional relationship when the lens driving device 101 is in a neutral state. In addition, the following explanation with reference to Figure 9 can be similarly applied to the fifth base side metal member 5F5 to the eighth base side metal member 5F8, the third lens side metal member 5M3, the fourth lens side metal member 5M4, the third wire SA3, and the fourth wire SA4.

[0062] Specifically, one end of the first wire SA1 is fixed to the first base metal member 5F1 at the holding portion J1 of the first base metal member 5F1, the other end of the first wire SA1 is fixed to the second base metal member 5F2 at the holding portion J2 of the second base metal member 5F2, and an intermediate portion of the first wire SA1 is fixed to the first lens metal member 5M1 at the holding portion JM1 of the first lens metal member 5M1. Similarly, one end of the second wire SA2 is fixed to the third base metal member 5F3 at the holding portion J3 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 the holding portion J4 of the fourth base metal member 5F4, and an intermediate portion of the second wire SA2 is fixed to the second lens metal member 5M2 at the holding portion JM2 of the second lens metal member 5M2.

[0063] The retaining portion J1 is formed by bending a portion of the first base-side metal member 5F1. Specifically, the retaining portion J1 is formed by bending a portion of the first base-side metal member 5F1 while sandwiching one end of the first wire SA1. The one end of the first wire SA1 is fixed to the retaining portion J1 by welding. The same applies to the retaining portions J2 to J4, the retaining portion JM1, and the retaining portion JM2. Also, as shown in the lower diagram of FIG. 9, the first wire SA1 is arranged so as to form a substantially V-shape in a front view, and the second wire SA2 is arranged so as to form a substantially inverted V-shape in a right side view.

[0064] The base member 3 is configured to function as a wire support member that supports both ends (one end and the other end) of each of the first to fourth wires SA1 to SA4. With this configuration, the lens holding member 2 is connected to the base member 3 via the first to fourth wires SA1 to SA4 in a state where it can move in the optical axis direction (Z-axis direction), which is a direction parallel to the optical axis OA.

[0065] In the illustrated example, each of the base side metal member 5F and the lens side metal member 5M is made 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 first lens side metal member 5M1 has a base portion BPM1, and the second lens side metal member 5M2 has a base portion BPM2. 9, 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 first lens-side metal member 5M1, and the second lens-side metal member 5M2 are attached to the lens holding member 2 or the base member 3 so that the plate surfaces of the base portions BPF1, BPF2, BPF3, BPF4, BPM1, and BPM2 are parallel to the XY plane, i.e., substantially parallel to each other. 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. The first lens-side metal member 5M1 is positioned lower in the Z-axis direction than the second lens-side metal member 5M2.

[0066] Next, with reference to Figures 10, 11, and 12, the positional relationship between the metal member 5, flexible metal member 7, support-side buried member 9, shape memory alloy wire SA, shape memory alloy wire SB, and base-side buried member 30, which are members through which current flows, will be described. Figure 10 is a perspective view of the metal member 5, flexible metal member 7, support-side buried member 9, shape memory alloy wire SA, shape memory alloy wire SB, and base-side buried member 30. Specifically, the upper view of Figure 10 is a perspective view of members related to the current path including the shape memory alloy wire SA, and the lower view of Figure 10 is a perspective view of members related to the current path including the shape memory alloy wire SB. Fig. 11 is a diagram extracted from a portion of the upper diagram of Fig. 10, in which the lower left diagram of Fig. 11 shows components related to the current path including the first wire SA1, the lower right diagram of Fig. 11 shows components related to the current path including the second wire SA2, the upper right diagram of Fig. 11 shows components related to the current path including the third wire SA3, and the upper left diagram of Fig. 11 shows components related to the current path including the fourth wire SA4. Also, Fig. 12 is a diagram extracted from a portion of the lower diagram of Fig. 10, in which the lower left diagram of Fig. 12 shows components related to the current path including the first wire SB1, the lower right diagram of Fig. 12 shows components related to the current path including the second wire SB2, the upper right diagram of Fig. 12 shows components related to the current path including the third wire SB3, and the upper left diagram of Fig. 12 shows components related to the current path including the fourth wire SB4.

[0067] As shown in the lower left diagram of FIG. 11 , when the first terminal 9AT of the first support-side buried member 9A is connected to a high potential and the fifth terminal 9ET of the fifth support-side buried member 9E is connected to a low potential, a current flows from the first terminal 9AT of the first support-side buried member 9A through the first joint 9AP of the first support-side buried member 9A, the first flexible metal member 7A (the first fixed joint 7AP and the first movable joint 7AQ), the first base-side buried member 30A (the first base-side joint 30AQ and the first wire-side joint 30AP), and the first flexible metal member 7A (the first base-side joint 30AQ and the first wire-side joint 30AP). , through the first base side metal member 5F1 (base BPF1 and holding portion J1), the first wire SA1, the second base side metal member 5F2 (holding portion J2 and base BPF2), the fifth base side embedded member 30E (fifth upper wire side joint 30EP1 and fifth base side joint 30EQ), the fifth flexible metal member 7E (fifth movable joint 7EQ and fifth fixed joint 7EP), and the fifth joint 9EP of the fifth support side embedded member 9E, and flows to the fifth terminal portion 9ET of the fifth support side embedded member 9E.

[0068] 11, when the second terminal 9BT of the second support-side buried member 9B is connected to a high potential and the fifth terminal 9ET of the fifth support-side buried member 9E is connected to a low potential, a current flows from the second terminal 9BT of the second support-side buried member 9B through the second joint 9BP of the second support-side buried member 9B, the second flexible metal member 7B (the second fixed joint 7BP and the second movable joint 7BQ), the second base-side buried member 30B (the second base-side joint 30BQ and the second wire-side joint 30B P), the fourth base side metal member 5F4 (base BPF4 and holding portion J4), the second wire SA2, the third base side metal member 5F3 (holding portion J3 and base BPF3), the fifth base side embedded member 30E (fifth lower wire side joint 30EP2 and fifth base side joint 30EQ), the fifth flexible metal member 7E (fifth movable joint 7EQ and fifth fixed joint 7EP), and the fifth joint 9EP of the fifth support side embedded member 9E, and flows to the fifth terminal portion 9ET of the fifth support side embedded member 9E.

[0069] In addition, whether the first terminal portion 9AT of the first support side buried member 9A is connected to a high potential or the second terminal portion 9BT of the second support side buried member 9B is connected to a high potential, the path of the current flowing from the fifth base side joint portion 30EQ of the fifth base side buried member 30E to the fifth terminal portion 9ET of the fifth support side buried member 9E is the same.

[0070] 11, when the third terminal 9CT of the third support-side buried member 9C is connected to a high potential and the sixth terminal 9FT of the sixth support-side buried member 9F is connected to a low potential, a current flows from the third terminal 9CT of the third support-side buried member 9C through the third joint 9CP of the third support-side buried member 9C, the third flexible metal member 7C (the third fixed joint 7CP and the third movable joint 7CQ), the third base-side buried member 30C (the third base-side joint 30CQ and the third wire-side joint 30CP), The current flows through the fifth base side metal member 5F5 (base BPF5 and holding portion J5), the third wire SA3, the sixth base side metal member 5F6 (holding portion J6 and base BPF6), the sixth base side embedded member 30F (sixth upper wire side joint 30FP1 and sixth base side joint 30FQ), the sixth flexible metal member 7F (sixth movable joint 7FQ and sixth fixed joint 7FP), and the sixth joint 9FP of the sixth support side embedded member 9F (see Figure 6), to the sixth terminal portion 9FT of the sixth support side embedded member 9F.

[0071] 11, when the fourth terminal 9DT of the fourth support-side buried member 9D is connected to a high potential and the sixth terminal 9FT of the sixth support-side buried member 9F is connected to a low potential, a current flows from the fourth terminal 9DT of the fourth support-side buried member 9D to the fourth joint 9DP (see FIG. 6) of the fourth support-side buried member 9D, the fourth flexible metal member 7D (the fourth fixed joint 7DP and the fourth movable joint 7DQ), the fourth base-side buried member 30D (the fourth base-side joint 30DQ (see FIG. 6) and the fourth wire-side joint 30DQ). 30DP), the eighth base-side metal member 5F8 (base BPF8 and holding portion J8), the fourth wire SA4, the seventh base-side metal member 5F7 (holding portion J7 and base BPF7), the sixth base-side buried member 30F (sixth lower wire-side joint 30FP2 and sixth base-side joint 30FQ), the sixth flexible metal member 7F (sixth movable joint 7FQ and sixth fixed joint 7FP), and the sixth joint 9FP of the sixth support-side buried member 9F (see Figure 6), and flows to the sixth terminal portion 9FT of the sixth support-side buried member 9F.

[0072] In addition, whether the third terminal portion 9CT of the third support side buried member 9C is connected to a high potential or the fourth terminal portion 9DT of the fourth support side buried member 9D is connected to a high potential, the path of the current flowing from the sixth base side joint portion 30FQ of the sixth base side buried member 30F to the sixth terminal portion 9FT of the sixth support side buried member 9F is the same.

[0073] Furthermore, as shown in the lower left diagram of Figure 12, when the ninth terminal portion 9IT of the ninth support side buried member 9I is connected to a high potential and the seventh terminal portion 9GT of the seventh support side buried member 9G is connected to a low potential, current flows from the ninth terminal portion 9IT of the ninth support side buried member 9I, through the ninth joint portion 9IP of the ninth support side buried member 9I, the first support side metal member 5G1 (base portion BPG1 and holding portion J9), the first wire SB1, the first supported side metal member 5N1 (holding portion J13 and base portion BPN1), the seventh base side buried member 30G (seventh wire side joint portion 30GP and seventh base side joint portion 30GQ), the seventh flexible metal member 7G (seventh movable joint portion 7GQ and seventh fixed joint portion 7GP), and the seventh joint portion 9GP of the seventh support side buried member 9G (see Figure 7), to the seventh terminal portion 9GT of the seventh support side buried member 9G.

[0074] Furthermore, as shown in the lower right diagram of FIG. 12, when the tenth terminal portion 9JT of the tenth support-side buried member 9J is connected to a high potential and the seventh terminal portion 9GT of the seventh support-side buried member 9G is connected to a low potential, a current flows from the tenth terminal portion 9JT of the tenth support-side buried member 9J to the tenth joint portion 9JP of the tenth support-side buried member 9J, the second support-side metallic member 5G2 (the base portion BPG2 and the holding portion J10), the second wire SB2 , through the first supported side metal member 5N1 (holding portion J14 and base portion BPN1), the seventh base side embedded member 30G (seventh wire side joint portion 30GP and seventh base side joint portion 30GQ), the seventh flexible metal member 7G (seventh movable joint portion 7GQ and seventh fixed joint portion 7GP), and the seventh joint portion 9GP of the seventh support side embedded member 9G (see Figure 7), and flows to the seventh terminal portion 9GT of the seventh support side embedded member 9G.

[0075] In addition, whether the 9th terminal portion 9IT of the 9th support side buried member 9I is connected to a high potential or the 10th terminal portion 9JT of the 10th support side buried member 9J is connected to a high potential, the path of the current flowing from the first supported side metal member 5N1 to the 7th terminal portion 9GT of the 7th support side buried member 9G is the same.

[0076] Furthermore, as shown in the upper right diagram of FIG. 12, when the eleventh terminal portion 9KT of the eleventh support-side buried member 9K is connected to a high potential and the eighth terminal portion 9HT of the eighth support-side buried member 9H is connected to a low potential, a current flows from the eleventh terminal portion 9KT of the eleventh support-side buried member 9K through the eleventh joint portion 9KP of the eleventh support-side buried member 9K, the third support-side metallic member 5G3 (the base portion BPG3 and the holding portion J11), the third wire SB3, the second The current flows through the supported side metal member 5N2 (holding portion J15 and base portion BPN2), the 8th base side embedded member 30H (8th wire side joint portion 30HP (see Figure 6) and 8th base side joint portion 30HQ), the 8th flexible metal member 7H (8th movable joint portion 7HQ and 8th fixed joint portion 7HP), and the 8th joint portion 9HP (see Figure 6) of the 8th support side embedded member 9H, and then to the 8th terminal portion 9HT of the 8th support side embedded member 9H.

[0077] Furthermore, as shown in the upper left diagram of FIG. 12, when the twelfth terminal portion 9LT of the twelfth support-side buried member 9L is connected to a high potential and the eighth terminal portion 9HT of the eighth support-side buried member 9H is connected to a low potential, a current flows from the twelfth terminal portion 9LT of the twelfth support-side buried member 9L through the twelfth joint portion 9LP of the twelfth support-side buried member 9L, the fourth support-side metallic member 5G4 (the base portion BPG4 and the holding portion J12), the fourth wire SB4, the second The current flows through the supported side metal member 5N2 (holding portion J16 and base portion BPN2), the 8th base side embedded member 30H (8th wire side joint portion 30HP (see Figure 6) and 8th base side joint portion 30HQ), the 8th flexible metal member 7H (8th movable joint portion 7HQ and 8th fixed joint portion 7HP), and the 8th joint portion 9HP (see Figure 6) of the 8th support side embedded member 9H, and then to the 8th terminal portion 9HT of the 8th support side embedded member 9H.

[0078] In addition, whether the 11th terminal portion 9KT of the 11th support side buried member 9K is connected to a high potential or the 12th terminal portion 9LT of the 12th support side buried member 9L is connected to a high potential, the path of the current flowing from the second supported side metal member 5N2 to the 8th terminal portion 9HT of the 8th support side buried member 9H is the same.

[0079] 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) and shape memory alloy wires SB (first wire SB1 to fourth wire SB4) by controlling the voltage applied to each of the terminal portions (first terminal portion 9AT to twelfth terminal portion 9LT) of the first support-side buried member 9A to twelfth support-side buried member 9L. For example, the control device may detect the electrical resistance value of each of the shape memory alloy wires and control the length of each of the shape memory alloy wires in accordance with the detection result. 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.

[0080] The control device may, for example, use a driving force parallel to the optical axis OA caused by contraction of the shape memory alloy wire SA as the first driving unit DM1 to move the lens holding member 2 in a direction parallel to the optical axis OA (Z-axis direction) on the Z1 side (subject side) of the image sensor IS. By moving the lens holding member 2 in this manner, the control device may realize an autofocus adjustment 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.

[0081] The control device may also move the lens holding member 2 in directions intersecting the optical axis OA (X-axis direction and Y-axis direction) by controlling the current flowing through the shape memory alloy wire SB as the second driving unit DM2, thereby enabling the control device to realize an image stabilization function.

[0082] Next, the positional relationship between the base side metal member 5F and the lens side metal member 5M that make up the first driving unit DM1 will be described with reference to Fig. 13. Fig. 13 is a top view of the first driving unit DM1. The first driving unit DM1 includes the first wire SA1 to the fourth wire SA4, 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.

[0083] 13, when viewed along the optical axis direction, the first driving unit DM1 is configured to be located inside a rectangle RT indicated by a dashed line when the lens driving device 101 is in a neutral state. The rectangle RT corresponds to the inner surface of the outer peripheral wall 1A of the cover member 1. Specifically, the rectangle RT includes a first side SD1 corresponding to the inner surface of the first side plate 1A1, a second side SD2 corresponding to the inner surface of the second side plate 1A2, a third side SD3 corresponding to the inner surface of the third side plate 1A3, and a fourth side SD4 corresponding to the inner surface of the fourth side plate 1A4.

[0084] Next, with reference to Fig. 14, the positional relationship between the second driving unit DM2 and each of the base member 3 and support member 8 will be described. Fig. 14 is a diagram showing the positional relationship between the base member 3, support member 8, and second driving unit DM2. Specifically, the upper view of Fig. 14 is a bottom view of the base member 3, support member 8, and second driving unit DM2, and the lower view of Fig. 14 is a cross-sectional view of the base member 3, support member 8, and second driving unit DM2. Specifically, the lower view of Fig. 14 is a cross-sectional view of the base member 3, support member 8, and second driving unit DM2 in the YZ plane including the cutting line CL1 in the upper view of Fig. 14, viewed from the X1 side.

[0085] 14, the base member 3 is configured so that, when the lens driving device 101 is in a neutral state, the lower end surface of the protrusion 3T (first protrusion 3T1) protrudes through the through-hole 8T (first through-hole 8T1) of the support member 8 to a position a distance DS1 from the lower surface of the support member 8. This is to ensure that, below the support member 8, the position (height) of the supported-side metal member 5N (first supported-side metal member 5N1) and the position (height) of the supporting-side metal member 5G (first supporting-side metal member 5G1 and second supporting-side metal member 5G2) in the optical axis direction (Z-axis direction) are the same.

[0086] This configuration brings about the effect that the lens driving device 101 can be realized with a simple structure of just providing a protrusion 3T on the base member 3 and a through-hole 8T on the support member 8, and can include a second driving unit DM2 (shape memory alloy wire SB) arranged on the underside of the support member 8. Specifically, this configuration brings about the effect that the supported side metal member 5N constituting the second driving unit DM2 can be assembled to the base member 3, and the supporting side metal member 5G constituting the second driving unit DM2 can be assembled to the support member 8, with a simple structure.

[0087] 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 Fig. 15. Fig. 15 is a perspective view of the lens driving device 101A. For clarity, Fig. 15 omits the illustration of the cover member 1, and shows the first driving unit DM1 (the base side metal member 5F, the lens side metal member 5M, and the shape memory alloy wire SA) detached from the other members.

[0088] The lens driving device 101A differs from the lens driving device 101 mainly in that the base side metal member 5F is attached to the side surface of the base member 3, and the lens side metal member 5M is attached to the side surface of the lens holding member 2. In the lens driving device 101, the base side metal member 5F is attached to the top surface of the base member 3, and the lens side metal member 5M is attached to the top surface of the lens holding member 2.

[0089] Specifically, in lens driving device 101A, each of 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 is made of a metal plate having a plate-shaped base portion BP, similar to the case of lens driving device 101. Unlike the case of lens driving device 101, each of 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 is configured so that the plate surface of the base portion BP is approximately parallel to the optical axis OA.

[0090] More specifically, the first base metal member 5F1, the second base metal member 5F2, and the first lens metal member 5M1 are arranged so that the plate surfaces of the base portions BPF1, BPF2, and BPM1 are substantially parallel to one another. The third base metal member 5F3, the fourth base metal member 5F4, and the second lens metal member 5M2 are arranged so that the plate surfaces of the base portions BPF3, BPF4, and BPM2 are substantially parallel to one another. The fifth base metal member 5F5, the sixth base metal member 5F6, and the third lens metal member 5M3 are arranged so that the plate surfaces of the base portions BPF5, BPF6, and BPM3 are substantially parallel to one another. The seventh base-side metal member 5F7, the eighth base-side metal member 5F8, and the fourth lens-side metal member 5M4 are arranged so that the plate surfaces of the base portion BPF7, the base portion BPF8, and the base portion BPM4 are approximately parallel to each other. The first to fourth wires SA1 to SA4 are each configured to be linear when energized in a plan view along the optical axis direction. The first wire SA1 is arranged to be approximately inverted V-shaped in a front view, the second wire SA2 is arranged to be approximately V-shaped in a right side view, the third wire SA3 is arranged to be approximately inverted V-shaped in a rear view, and the fourth wire SA4 is arranged to be approximately V-shaped in a left side view. The first base-side metal member 5F1 and the second base-side metal member 5F2 are arranged so that the position (height) of the holding portion J1 and the position (height) of the holding portion J2 are the same in the Z-axis direction. The same applies to the positional relationship between the third base-side metal member 5F3 and the fourth base-side metal member 5F4, the positional relationship between the fifth base-side metal member 5F5 and the sixth base-side metal member 5F6, and the positional relationship between the seventh base-side metal member 5F7 and the eighth base-side metal member 5F8. Furthermore, the first lens-side metal member 5M1 and the second lens-side metal member 5M2 are arranged such that the position (height) of the holding portion JM1 is lower than the position (height) of the holding portion JM2 in the Z-axis direction. The same applies to the positional relationship between the third lens-side metal member 5M3 and the fourth lens-side metal member 5M4.

[0091] This configuration has the advantage that the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 can each be attached to the corresponding member (lens holding member 2 or base member 3) from the same side (the front side in the illustrated example). Similarly, this configuration has the advantage that 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 lens holding member 2 or the base member 3) from the same side (the right side in the illustrated example), the fifth base-side metal member 5F5, the sixth base-side metal member 5F6, and the third lens-side metal member 5M3 can each be attached to the corresponding member (the lens holding member 2 or the base member 3) from the same side (the rear side in the illustrated example), and 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 lens holding member 2 or the base member 3) from the same side (the left side in the illustrated example). Therefore, this configuration can improve the productivity (assemblability) of the lens driving device 101.

[0092] 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 3, a lens holding member 2 having a cylindrical portion 2C capable of holding a lens body LS, and a driving unit DM (first driving unit DM1) configured with a shape memory alloy wire SA that moves the lens holding member 2 up and down along the optical axis direction relative to the base member 3. The shape memory alloy wire SA includes a first wire SA1. The base member 3 is provided with a first base-side metal member 5F1 and a second base-side metal member 5F2 that are spaced apart in a first direction (left-right direction, Y-axis direction) that intersects the optical axis direction. One end of the first wire SA1 is fixed to the first base-side metal member 5F1, and the other end is fixed to the second base-side metal member 5F2. An intermediate portion of the first wire SA1 located between the one end and the other end is fixed to a first central fixing portion CF1 provided on the lens holding member 2. The first central fixed portion CF1 is disposed between the first base metal member 5F1 and the second base metal member 5F2 in a plan view along the optical axis direction. Furthermore, as shown in the lower diagram of FIG. 9, the middle portion of the first wire SA1 in the optical axis direction is disposed at a position different from each of the one end and the other end of the first wire SA1. The same is true for the lens driving device 101A shown in FIG. 15. In the illustrated example, the base member 3 constitutes the movable member MB, but may also constitute the fixed member FB.

[0093] This configuration has the effect of suppressing problems related to the retention of the shape memory alloy wire SA. For example, this configuration can suppress the generation of wear debris and the like caused by the middle portion of the first wire SA1 sliding on other members. This is because the middle portion of the first wire SA1 is fixed to the first central fixing portion CF1, and the middle portion of the first wire SA1 does not slide on other members when current is applied to the first wire SA1. This configuration also prevents the middle portion of the first wire SA1 from coming off the retaining element (first central fixing portion CF1) even if the lens driving device 101 receives a strong impact, such as from being dropped. This is because the first wire SA1 is fixed to the first central fixing portion CF1.

[0094] 2, the first central fixing portion CF1 may be configured of a first lens side metal member 5M1 made of metal. However, the first central fixing portion CF1 may be made of a material other than metal, such as synthetic resin. For example, the first central fixing portion CF1 may be a part of the lens holding member 2.

[0095] This configuration has the effect of making the bond between the middle portion of the first wire SA1 and first central fixed portion CF1 more reliable than when first central fixed portion CF1 is made of a material other than metal.

[0096] 9, each of the first base metal member 5F1, the second base metal member 5F2, and the first lens metal member 5M1 may be made of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP constituting the first base metal member 5F1, the second base metal member 5F2, and the first lens metal member 5M1 may be approximately parallel to each other.

[0097] This configuration has the advantage that the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 can be attached to the corresponding member (the lens holding member 2 or the base member 3) from the same side (the upper side in the illustrated example). Therefore, this configuration can improve the productivity (assembly) of the lens driving device 101.

[0098] 9, the intermediate portion of the first wire SA1 may be located lower than both ends of the first wire SA1 in the optical axis direction. Also, as shown in FIG. 2, the shape memory alloy wire SA may include a second wire SA2, and the base member 3 may be provided with a third base-side metal member 5F3 and a fourth base-side metal member 5F4 that are spaced apart in a second direction (front-rear direction, X-axis direction) that intersects with the optical axis direction and is perpendicular to the first direction (Y-axis direction). One end of the second wire SA2 may be fixed to the third base-side metal member 5F3, and the other end may be fixed to the fourth base-side metal member 5F4. In this case, the intermediate portion of the second wire SA2 located between the one end and the other end of the second wire SA2 may be fixed to a second lens-side metal member 5M2 that serves as a second central fixing portion CF2 provided on the lens holding member 2. The second lens side metal member 5M2 may be disposed between the third base side metal member 5F3 and the fourth base side metal member 5F4 in a plan view along the optical axis direction. Furthermore, the intermediate portion of the second wire SA2 may be disposed higher than both ends of the second wire SA2 in the optical axis direction, as shown in the lower diagram of FIG. 9. Furthermore, the first wire SA1 and the second wire SA2 may each be configured to be linear when energized, as shown in FIG. 13. In the example shown in the lower diagram of FIG. 9, the intermediate portion of the first wire SA1 is disposed lower by a height HT1 than both ends of the first wire SA1. Furthermore, the intermediate portion of the second wire SA2 is disposed higher by a height HT2 than both ends of the second wire SA2.

[0099] This configuration has the advantage of enabling the position of the lens holding member 2 in the optical axis direction to be adjusted using two types of shape memory alloy wires SA: the first wire SA1, which is substantially V-shaped in side view, and the second wire SA2, which is substantially inverted V-shaped. This configuration also prevents the generation of wear debris and other debris caused by the middle portion of the second wire SA2 sliding on other members. This is because the middle portion of the second wire SA2 is fixed to the second lens side metal member 5M2, preventing the middle portion of the second wire SA2 from sliding on other members when current is applied to the second wire SA2. This configuration also prevents the middle portion of the second wire SA2 from coming off the holding element (the second lens side metal member 5M2) even when the lens driving device 101 receives a strong impact, such as from being dropped. This is because the second wire SA2 is fixed to the second lens side metal member 5M2.

[0100] 9, the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 may each be configured of a metal plate having a plate-shaped base portion BP. The plate surfaces of the base portions BP constituting the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 may be approximately parallel to each other.

[0101] This configuration has the advantage that the third base-side metal member 5F3, the fourth base-side metal member 5F4, and the second lens-side metal member 5M2 can be attached to the corresponding member (the lens holding member 2 or the base member 3) from the same side (the upper side in the illustrated example). Therefore, this configuration can improve the productivity (assembly) of the lens driving device 101.

[0102] 9, the first base side metal member 5F1 and the third base side metal member 5F3 may have the same shape and size, the second base side metal member 5F2 and the fourth base side metal member 5F4 may have the same shape and size, and the first lens side metal member 5M1 and the second lens side metal member 5M2 may have the same shape and size. Note 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 may be an upside-down combination of the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2. In other words, 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 may be 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 flipped upside down and rotated 90 degrees counterclockwise around the optical axis OA.

[0103] This configuration has the advantage of reducing the number of parts by standardizing parts compared to when the first base side metal member 5F1, the second base side metal member 5F2, the first lens side metal member 5M1, 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 different shape or size.

[0104] Also, as shown in Figure 9, 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 first lens side metal member 5M1, and the second lens side metal member 5M2 may be approximately perpendicular to the optical axis direction.

[0105] 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 3 or the lens holding member 2. Therefore, this configuration can further improve the productivity (assembly) of the lens driving device 101.

[0106] 13, in a plan view along the optical axis direction, the first wire SA1 may be arranged along one (first side SD1) of two sides (adjacent) that are substantially perpendicular to each other, and the second wire SA2 may be arranged along the other (second side SD2). The second base-side metal member 5F2 and the third base-side metal member 5F3 may at least partially face each other in the optical axis direction. That is, the second base-side metal member 5F2 and the third base-side metal member 5F3 may at least partially overlap in the optical axis direction. Note that in FIG. 13, for ease of understanding, a dot pattern is applied to the portions of the base-side metal members 5F that overlap in the optical axis direction.

[0107] This configuration has the advantage of enabling the first driving unit DM1 to be made smaller, and ultimately enabling the lens driving device 101 to be made smaller, compared to a configuration in which the second base side metal member 5F2 and the third base side metal member 5F3 do not overlap in the optical axis direction.

[0108] 2, the shape memory alloy wire SA may include a third wire SA3 and a fourth wire SA4, and the base member 3 may be provided with a fifth base-side metal member 5F5 and a sixth base-side metal member 5F6 spaced apart in a first direction (left-right direction, Y-axis direction), and a seventh base-side metal member 5F7 and an eighth base-side metal member 5F8 spaced apart in a second direction (front-back direction, X-axis direction). One end of the third wire SA3 may be fixed to the fifth base-side metal member 5F5, and the other end may be fixed to the sixth base-side metal member 5F6, and an intermediate portion of the third wire SA3 located between the one end and the other end may be fixed to a third lens-side metal member 5M3 serving as a third central fixing portion CF3 provided on the lens holding member 2. Furthermore, the fourth wire SA4 may have one end fixed to the seventh base-side metal member 5F7 and the other end fixed to the eighth base-side metal member 5F8, and an intermediate portion of the fourth wire SA4 located between the one end and the other end may be fixed to a fourth lens-side metal member 5M4 serving as a fourth central fixing portion CF4 provided on the lens holding member 2. In this case, the first wire SA1 and the third wire SA3 may be arranged spaced apart (facing each other) in the second direction (front-rear direction, X-axis direction) with the lens holding member 2 (cylindrical portion 2C) therebetween, and the second wire SA2 and the fourth wire SA4 may be arranged spaced apart (facing each other) in the first direction (left-right direction, Y-axis direction) with the lens holding member 2 (cylindrical portion 2C) therebetween. 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 may each have the same shape and the same 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 may each have the same shape and the same size, and 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 each have the same shape and the same size. This configuration has the effect of further reducing the number of parts by standardizing parts.

[0109] 2, the lens driving device 101 may have a leaf spring 6 that connects the lens holding member 2 and the base member 3. This configuration has the effect of allowing the leaf spring 6 to center the lens holding member 2 with respect to the base member 3 in the XY plane.

[0110] Furthermore, the lens holding member 2 may be provided with a lens-side magnetic member MP as shown in the upper diagram of FIG. 3, and the base member 3 may be provided with a magnet 4 as shown in the upper diagram of FIG. 6. The lens holding member 2 and the base member 3 may be configured to maintain a predetermined positional relationship with each other by an attractive force acting between the magnet 4 and the lens-side magnetic member MP. The predetermined positional relationship is, for example, the positional relationship between the lens holding member 2 and the base member 3 in the lens driving device 101 in the initial state, and corresponds to the positional relationship in each of the X-axis direction and the Y-axis direction between the lens holding member 2 and the base member 3 in the lens driving device 101 in the neutral state. The initial state of the lens driving device 101 is, for example, the state of the lens driving device 101 when no current is supplied to the shape memory alloy wire SA and the shape memory alloy wire SB. In the illustrated example, the lens holding member 2 is configured to be centered relative to the base member 3 by the attractive force acting between the first magnet 41 and the first lens side magnetic member MP1 (the fourth exposed portion 20DQ of the fourth lens side embedded member 20D) and the attractive force acting between the second magnet 42 and the second lens side magnetic member MP2 (the eighth exposed portion 20HQ of the eighth lens side embedded member 20H).

[0111] This configuration has the effect of enabling centering of the lens holding member 2 with respect to the base member 3. In the initial state, the lens driving device 101 is configured so that the contact portion 2S (see FIG. 4) of the lens holding member 2 comes into contact with the contact portion 3S (see FIG. 5) of the base member 3. Conversely, in the neutral state, the lens driving device 101 is configured so that the lens holding member 2 does not come into contact with the base member 3. This configuration also has the effect of preventing the lens holding member 2 and the base member 3 from moving away from each other in the optical axis direction when the lens driving device 101 is in the initial state.

[0112] 1, a magnetic member 10 may be fixed to the support member 8, and a magnet 4 may be provided on the base member 3 as shown in the upper diagram of FIG. 6. The base member 3 and the support member 8 may be configured to maintain a predetermined positional relationship with each other by an attractive force acting between the magnet 4 and the magnetic member 10.

[0113] This configuration has the effect of preventing the base member 3 and the support member 8 from separating from each other in the optical axis direction, and therefore, this configuration can maintain contact between the guiding portion GD and the guided portion GE.

[0114] 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.

[0115] For example, in the above-described embodiment, the metal member 5 is fixed to each member (the lens holding member 2, the base member 3, and the support 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. [Explanation of symbols]

[0116] REFERENCE SIGNS LIST 1 Cover member 1A Outer peripheral wall portion 1A1 First side plate portion 1A2 Second side plate portion 1A3 Third side plate portion 1A4 Fourth side plate portion 1B Top plate portion 1K Opening 1S Storage portion 2 Lens holding member 2C Cylindrical portion 2D Base portion 2D1 First base portion 2D2 Second base portion 2D3 Third base portion 2D4 Fourth base portion 2P Projection portion 2S Contact portion 2V Projection portion 3 Base member 3B Main body portion 3C Contact portion 3D Base portion 3D1 First base portion 3D2 Second base portion 3D3...Third base portion 3D4...Fourth base portion 3E...Side portion 3E1...First side portion 3E2...Second side portion 3E3...Third side portion 3E4...Fourth side portion 3K...Opening 3P...Protrusion portion 3Q...Protrusion portion 3S...Contact portion 3T...Protrusion portion 3T1...First protrusion portion 3T2...Second protrusion portion 3V...Protrusion portion 3W...Protrusion portion 4...Magnet 5...Metal member 5F...Base side metal member 5F1...First base side metal member 5F2...Second base side metal member 5F3...Third base side metal member 5F4...Fourth base side metal member 5F5...Fifth base side metal member 5F6...6th base side metal member 5F7...7th base side metal member 5F8...8th base side metal member 5G...Support side metal member 5G1...1st support side metal member 5G2...2nd support side metal member 5G3...3rd support side metal member 5G4...4th support side metal member 5M...Lens side metal member 5M1...1st lens side metal member 5M2...2nd lens side metal member 5M3...3rd lens side metal member 5M4...4th lens side metal member 5N...Supported side metal member 5N1...1st supported side metal member 5N2...2nd supported side metal member 6...Leaf spring 6B...Base side part 6B1...1st base side part 6B2...2nd base side part 6G····Elastic part 6G1···First elastic part 6G2···Second elastic part 6G3···Third elastic part 6G4···Fourth elastic part 6H1···First through hole 6H2···Second through hole 6H3···Third through hole 6H4···Fourth through hole 6L···Lens side part 6L1···First lens side part 6L2···Second lens side part7···Flexible metal member 7A···1st flexible metal member 7AP···1st fixed joint 7AQ···1st movable joint 7B···2nd flexible metal member 7BP···2nd fixed joint 7BQ···2nd movable joint 7C···3rd flexible metal member 7CP···3rd fixed joint 7CQ···3rd movable joint 7D···4th flexible metal member 7DP···4th fixed joint 7DQ···4th movable joint 7E···5th flexible metal member 7EP···5th fixed joint 7EQ···5th movable joint 7F···6th flexible metal member 7FP ···6th fixed joint 7FQ···6th movable joint 7G···7th flexible metal member 7GP···7th fixed joint 7GQ···7th movable joint 7H···8th flexible metal member 7HP···8th fixed joint 7HQ···8th movable joint 8···Supporting member 8B···Base 8K···Opening 8P···Protrusion 8T···Through portion 8T1···1st through portion 8T2···2nd through portion 8V···Protrusion 9···Supporting side embedded member 9A···1st supporting side embedded member 9AP···1st joint 9AT···1st terminal portion 9B···2nd supporting side embedded member 2nd supporting side embedded member 9BP···2nd joining portion 9BT···2nd terminal portion 9BX···2nd exposed portion 9C···3rd supporting side embedded member 9CP···3rd joining portion 9CT···3rd terminal portion 9D···4th supporting side embedded member 9DP···4th joining portion 9DT···4th terminal portion 9DX···4th exposed portion 9E···5th supporting side embedded member 9EP···5th joining portion 9ET···5th terminal portion 9F···6th supporting side embedded member 9FP···6th joining portion 9FT···6th terminal portion 9G···7th supporting side embedded member 9GP···7th joining portion 9GT···7th terminal portion 9 H···8th supporting side embedded member 9HP···8th joining portion 9HT···8th terminal portion 9I···9th supporting side embedded member 9IP···9th joining portion 9IT···9th terminal portion 9IX···9th exposed portion 9J···10th supporting side embedded member 9JP···10th joining portion 9JT···10th terminal portion 9K···11th supporting side embedded member 9KP···11th joining portion 9KT···11th terminal portion 9L···12th supporting side embedded member 9LP···12th joining portion 9LT···12th terminal portion 10···Magnetic member 10K···Opening 20···Lens side embedded member20A···First lens side buried member 20AP···First joint portion 20B···Second lens side buried member 20BP···Second joint portion 20C···Third lens side buried member 20CP···Third joint portion 20CQ···Third exposed portion 20D···Fourth lens side buried member 20DP···Fourth joint portion 20DQ···Fourth exposed portion 20E···Fifth lens side buried member 20EP···Fifth joint portion 20F···Sixth lens side buried member 20FP···Sixth joint portion 20G···Seventh lens side buried member 20GP···Seventh joint portion 20GQ···Seventh exposed portion 20H···Eighth lens side buried member 20HP···Eighth joint portion 20HQ···Eighth exposed portion 30···Base side buried member 30A···First base side buried member 30AP···First wire side joint 30AQ···First base side joint 30B···Second base side buried member 30BP···Second wire side joint 30BQ···Second base side joint 30C···Third base side buried member 30CP···Third wire side joint 30CQ···Third base side joint 30D···Fourth base side buried member 30DP···Fourth wire side joint 30DQ···Fourth base side joint 30E···Fifth base side buried member 30EP1···Fifth upper wire side joint 30EP2···Fifth lower wire side joint 30EQ···Fifth base side joint 30F···Sixth base-side buried member 30FP1···Sixth upper wire-side joint 30FP2···Sixth lower wire-side joint 30FQ···Sixth base-side joint 30G···Seventh base-side buried member 30GP···Seventh wire-side joint 30GQ···Seventh base-side joint 30H···Eighth base-side buried member 30HP···Eighth wire-side joint 30HQ···Eighth base-side joint 41···First magnet 42···Second magnet 101, 101A···Lens drive unit AH···Rectangular hole BP···Base CF···Central fixing part CF1···First central fixing part CF2···Second central fixing part CF3···Third central fixing part CF4···Fourth central fixing part CM···Camera module DM···Drive unit DM1···First drive unit DM2···Second drive unit FB···Fixed side member GD···Guide unit GD1···First guide unit GD2···Second guide unit GD3···Third guide unit GE···Guided unitGE1···First guided part GE2···Second guided part GE3···Third guided part HS···Housing IS···Image sensor J1 to J16···Holding part JM1 to JM4···Holding part LS···Lens body MB···Movable side part MG···Position detection magnet MG1···First position detection magnet MG2···Second position detection magnet MP···Lens side magnetic part MP1···First lens side magnetic part MP2···Second lens side magnetic part OA···Optical axis RH···Rectangular hole SA···Shape memory alloy wire SA1···First wire SA2···Second wire SA3···Third wire SA4···Fourth wire SB···Shape memory alloy wire SB1···First wire SB2···Second wire SB3···Third wire SB4···Fourth wire SU substrate

Claims

1. A base member; a lens holding member capable of holding a lens body; a drive unit configured with a shape memory alloy wire that moves the lens holding member along the optical axis relative to the base member, The shape memory alloy wire includes a first wire, the base member is provided with a first base-side metal member and a second base-side metal member that are spaced apart in a first direction that intersects with the optical axis direction; one end of the first wire is fixed to the first base-side metal member, and the other end is fixed to the second base-side metal member, and an intermediate portion of the first wire located between the one end and the other end of the first wire is fixed to a first central fixing portion provided on the lens holding member, the first central fixed portion is disposed between the first base side metal member and the second base side metal member in a plan view along the optical axis direction, A lens driving device, characterized in that an intermediate portion of the first wire is disposed at a position different from each of one end and the other end of the first wire in the optical axis direction.

2. the first central fixed portion is configured by a first lens side metal member formed of metal, The lens driving device according to claim 1 .

3. each of the first base side metal member, the second base side metal member, and the first lens side metal member is made of a metal plate having a plate-shaped base portion; the plate surfaces of the base portions constituting the first base side metal member, the second base side metal member, and the first lens side metal member are substantially parallel to each other; 3. The lens driving device according to claim 2.

4. an intermediate portion of the first wire is located lower than one end and the other end of the first wire in the optical axis direction; The shape memory alloy wire includes a second wire, the base member is provided with a third base-side metal member and a fourth base-side metal member that are arranged to be spaced apart in a second direction that intersects with the optical axis direction and is perpendicular to the first direction, one end of the second wire is fixed to the third base-side metal member and the other end is fixed to the fourth base-side metal member, an intermediate portion of the second wire located between one end and the other end of the second wire is fixed to a second lens side metal member as a second central fixing portion provided on the lens holding member, the second lens side metal member is disposed between the third base side metal member and the fourth base side metal member in a plan view along the optical axis direction, an intermediate portion of the second wire is disposed at a position higher than one end and the other end of the second wire in the optical axis direction; 4. The lens driving device according to claim 3.

5. each of the third base side metal member, the fourth base side metal member, and the second lens side metal member is made of a metal plate having a plate-shaped base portion; the plate surfaces of the base portions constituting the third base side metal member, the fourth base side metal member, and the second lens side metal member are substantially parallel to each other; 5. The lens driving device according to claim 4.

6. the first base-side metal member and the third base-side metal member have the same shape and size, the second base-side metal member and the fourth base-side metal member have the same shape and size, the first lens side metal member and the second lens side metal member have the same shape and size; 6. The lens driving device according to claim 5.

7. a plate surface of each base portion constituting each of 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 first lens side metal member, and the second lens side metal member is approximately perpendicular to the optical axis direction; 7. The lens driving device according to claim 5 or 6.

8. In a plan view along the optical axis direction, the first wire is arranged along one of two sides that are substantially perpendicular to each other, and the second wire is arranged along the other of the two sides, At least a portion of the second base side metal member and the third base side metal member faces each other in the optical axis direction.

8. The lens driving device according to claim 7.

9. the shape memory alloy wires include a third wire and a fourth wire; the base member is provided with a fifth base-side metal member and a sixth base-side metal member that are spaced apart in the first direction, and a seventh base-side metal member and an eighth base-side metal member that are spaced apart in the second direction; one end of the third wire is fixed to the fifth base-side metal member and the other end is fixed to the sixth base-side metal member, an intermediate portion of the third wire located between one end and the other end of the third wire is fixed to a third lens side metal member as a third central fixed portion provided on the lens holding member, one end of the fourth wire is fixed to the seventh base-side metal member and the other end is fixed to the eighth base-side metal member, an intermediate portion of the fourth wire located between one end and the other end of the fourth wire is fixed to a fourth lens side metal member as a fourth central fixed portion provided on the lens holding member, the first wire and the third wire are spaced apart from each other in the second direction with the lens holding member interposed therebetween, the second wire and the fourth wire are spaced apart from each other across the lens holding member in the first direction, 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 the same 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 the same size, 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 the same size, 6. The lens driving device according to claim 4 or 5.

10. a leaf spring that connects the lens holding member and the base member; 7. The lens driving device according to claim 1.

11. The lens holding member is provided with a lens-side magnetic member, The base member is provided with a magnet, The lens holding member and the base member are configured to maintain a predetermined positional relationship with each other by an attractive force acting between the magnet and the lens-side magnetic member.

7. The lens driving device according to claim 1.

12. A lens driving device according to any one of claims 1 to 6, the lens body fixed to the lens holding member; an imaging element facing the lens body, Camera module.

Images