Lens driving device and camera module

Abstract

To provide a lens driving device capable of more stably moving a lens holding member along an optical axis direction.SOLUTION: The lens drive device 101 includes a shape memory alloy wire SA that is provided between the base member 3 and the lens holding member 2, and moves the lens holding member 2 in the optical axis direction. One end of the shape-memory alloy wire SA supported by the base member 3 and the other end supported by the lens holding member 2 are disposed at different positions in the optical axis direction. The base member 3 has a guide portion GD that guides movement of the lens holding member 2 in the optical axis direction, and the lens holding member 2 has a guided portion GE that is guided by the guide portion GD. When a current flows through the shape memory alloy wire SA, a pressing force that causes the guide section GD and the guided section GE to press against each other acts on the guide section GD and the guided section GE due to the contraction of the shape memory alloy wire SA, and the guided section GE slides along the guide section GD.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] BACKGROUND ART Conventionally, a lens driving device is known that is configured to move a lens holding member (lens holder) in the optical axis direction relative to a base member (actuator base) by a shape memory alloy wire (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-286820 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since this lens driving device only holds the lens holding member with a leaf spring, there is a risk that the lens holding member may not be able to move stably along the optical axis direction.

[0005] Therefore, it is desirable to provide a lens driving device that can more stably move a lens holding member along the optical axis direction. [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 having a cylindrical portion capable of holding a lens body, and a shape memory alloy wire arranged between the base member and the lens holding member and moving the lens holding member in the optical axis direction, wherein the shape memory alloy wire has one end supported by the base member and the other end supported by the lens holding member positioned at different positions in the optical axis direction, the base member has a guiding portion that guides the movement of the lens holding member in the optical axis direction, and the lens holding member has a guided portion guided by the guiding portion, and when an electric current is passed through the shape memory alloy wire, the shape memory alloy wire contracts, causing a pressing force to act on the guiding portion and the guided portion so that the guiding portion and the guided portion press against each other, causing the guided portion to slide along the guiding portion. [Effects of the Invention]

[0007] The above-described lens driving device can more stably move the lens holding member along the optical axis direction. [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] FIG. 2 is a perspective view of a lens holding member, a lens side metal member, a leaf spring, and a lens side magnetic member. [Figure 4] 1 is a perspective view of a base member, a base-side metal member, a supported-side metal member, a supporting-side metal member, a leaf spring, a flexible metal member, a flexible wiring board, an embedded member, and a base-side magnetic member. [Figure 5] 1 is a bottom perspective view of a base member, a supported metal member, a supporting metal member, a flexible metal member, a supporting member, a flexible wiring board, an embedded member, a shape memory alloy wire, and a supporting magnetic member. FIG. [Figure 6]FIG. 2 is a top view of the lens holding member, the base member, the receiving member, and the embedding member. [Figure 7] 2 is a perspective view of a support-side metal member, a flexible metal member, a support member, a flexible wiring board, and a support-side magnetic member. FIG. [Figure 8] FIG. 2 is a perspective view of a metal member and a shape memory alloy wire. [Figure 9] 1 is a perspective view of a metal member, a leaf spring, a flexible metal member, a flexible wiring board, an embedded 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 leaf spring, a flexible wiring board, an embedded member, and a shape memory alloy wire. [Figure 11] 1 is a perspective view of a supported metal member, a supporting metal member, a flexible metal member, a flexible wiring board, an embedded member, and a shape memory alloy wire. FIG. [Figure 12] 3A and 3B are three-view diagrams of a lens-side magnetic member, a base-side magnetic member, and a support-side magnetic member. [Figure 13] FIG. 2 is a perspective view of a support member and an embedded member. DETAILED DESCRIPTION OF THE INVENTION

[0009] A lens driving device 101 according to an embodiment of the present disclosure 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 a fixed-side member FB, and a support member 8. The cover member 1 is configured to function as part of a 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 rounded rectangular 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 and the support member 8 are joined with an adhesive as shown in FIG. 1 to form the housing HS. Furthermore, a support-side magnetic member SM is bonded to the lower surface of the support member 8 with an adhesive.

[0014] As shown in Figure 2, between the cover member 1 and the support member 8, a lens holding member 2, a base member 3, a metal member 5, a leaf spring 6, a flexible metal member 7, a receiving member 9, a flexible wiring board 11, an embedded member 30, a base side magnetic member BM, a lens side magnetic member LM, a shape memory alloy wire SA, and a shape memory alloy wire SB are housed.

[0015] 3 is a perspective view of the lens holding member 2, the lens side metal member 5M, the leaf spring 6, and the lens side magnetic member LM. Specifically, the upper view of FIG. 3 (the view above the block arrow) is an exploded perspective view, and the lower view of FIG. 3 (the view below the block arrow) is an assembled perspective view.

[0016] 4 is a perspective view of the base member 3, the base-side metal member 5F, the supported-side metal member 5G, the supporting-side metal member 5N, the leaf spring 6, the flexible metal member 7, the receiving member 9, the flexible wiring board 11, the embedded member 30, and the base-side magnetic member BM. Specifically, the upper view in FIG. 4 (the view above the block arrow) is an exploded perspective view, and the lower view in FIG. 4 (the view below the block arrow) is an assembled perspective view.

[0017] FIG. 5 is a bottom perspective view of the base member 3, the supported metal member 5G, the supporting metal member 5N, the flexible metal member 7, the supporting member 8, the flexible wiring board 11, the embedded member 30, the shape memory alloy wire SB, and the supporting magnetic member SM.

[0018] Fig. 6 is a top view of the lens holding member 2, the base member 3, the receiving member 9, and the embedded member 30. In Fig. 6, for clarity, a dot pattern is applied to the base member 3, and a cross pattern is applied to the receiving member 9.

[0019] 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.

[0020] 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 and a second pedestal portion 2D2. The first pedestal portion 2D1 and the second pedestal portion 2D2 are arranged to extend in opposite directions in the radial direction (diagonal direction) across the optical axis OA. A portion of a leaf spring 6 is placed on the upper surface of each of the first pedestal portion 2D1 and the second pedestal portion 2D2.

[0021] As shown in FIG. 3 , the base 2D has a mounting wall MW to which the lens side metal member 5M is attached and a guided wall GW formed along a plane (XZ plane) intersecting (approximately perpendicular) to a plane (YZ plane) along the plate surface of the base portion BP of the lens side metal member 5M. The guided wall GW is a portion where a part of the guide mechanism GM that guides movement of the lens holding member 2 relative to the base member 3 in the optical axis direction is provided. A guided part GE, which is part of the guide mechanism GM, is formed on the inner surface of the guided wall GW, and a lens side magnetic member LM is fixed to a recess 2R formed on the outer surface of the guided wall GW. Specifically, the first base 2D1 has a first mounting wall MW1 to which the first lens side metal member 5M1 is attached and a first guided wall GW1 formed along a plane (XZ plane) intersecting (approximately perpendicular) to a plane (YZ plane) along the plate surface of the base portion BPM1 of the first lens side metal member 5M1. The first guided wall portion GW1 is a portion on which part of the first guide mechanism GM1 is provided. A first guided portion GE1, which is part of the first guide mechanism GM1, is formed on the inner surface of the first guided wall portion GW1, and a first recess 2R1 formed on the outer surface of the first guided wall portion GW1 has a first lens side magnetic member LM1 adhesively fixed thereto. Similarly, the second pedestal portion 2D2 has a second mounting wall portion MW2 to which the second lens side metal member 5M2 is attached, and a second guided wall portion GW2 formed along a plane (XZ plane) that intersects (is substantially perpendicular to) a plane (YZ plane) along the plate surface of the base portion BPM2 of the second lens side metal member 5M2. The second guided wall portion GW2 is a portion on which part of the second guide mechanism GM2 is provided. A second guided portion GE2, which is part of the second guide mechanism GM2, is formed on the inner surface of the second guided wall portion GW2, and a second lens side magnetic member LM2 is adhesively fixed to a second recess (not visible in Figure 3) formed on the outer surface of the second guided wall portion GW2.

[0022] In the illustrated example, the guided portion GE, together with the guiding portion GD described below, constitutes a guide mechanism GM. Specifically, the first guided portion GE1, together with the first guiding portion GD1, constitutes a first guide mechanism GM1, and the second guided portion GE2, together with the second guiding portion GD2, constitutes a second guide mechanism GM2. The first guided portion GE1 includes a groove portion 2V, which is a V-groove extending in the optical axis direction, and is configured to contact the circumferential surface of the substantially cylindrical receiving member 9 (first receiving member 9A) at two points. On the other hand, the second guided portion GE2 includes a flat portion 2F extending in the optical axis direction, and is configured to contact the circumferential surface of the substantially cylindrical receiving member 9 (second receiving member 9B) at one point. With this configuration, the guide mechanism GM can prevent undesired movement of the lens holding member 2 relative to the base member 3 in each of the X-axis and Y-axis directions.

[0023] 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, as shown in FIG. 2, 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 first wire SA1 to fourth wire SA4, and the shape memory alloy wire SB includes first wire SB1 to fourth wire SB4.

[0024] 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, the shape memory alloy wire SA is stretched linearly along the inner surface of the outer peripheral wall portion 1A of the cover member 1 when a current is supplied thereto, and is configured to be able to move the lens holding member 2 relative to the base member 3 in a direction parallel to the optical axis OA (Z-axis direction). Each of the first wire SA1 to the fourth wire SA4 has one end fixed to the base-side metal member 5F by crimping, welding, or the like, and the other end fixed to the lens-side metal member 5M by crimping, welding, or the like. The shape memory alloy wire SB is stretched linearly along each side of the support member 8 when a current is supplied thereto, and is configured to be able to move the base member 3 relative to the support member 8 in directions perpendicular to the optical axis OA (X-axis direction and Y-axis direction). Each of the first wire SB1 to the fourth wire SB4 has one end fixed to the supporting metal member 5N by crimping, welding, or the like, and the other end fixed to the supported metal member 5G by crimping, welding, or the like.

[0025] In the illustrated example, the first wire SA1 and the second wire SA2 are arranged so as to intersect each other without contacting each other on the front side (X1 side) of the lens holding member 2 and the base member 3, and the third wire SA3 and the fourth wire SA4 are arranged so as to intersect each other without contacting each other on the rear side (X2 side) of the lens holding member 2 and the base member 3.

[0026] 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) back and forth along a first direction (X-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) left and right along a second direction (Y-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.

[0027] The base member 3 is a member that is movable in both the X-axis and Y-axis directions 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, as shown in FIG. 2, the base member 3 has a substantially rectangular outer shape in a plan view (top view) and has a substantially rounded rectangular 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, a protrusion portion 3T, and an outer wall portion 3W that protrude upward from the main body portion 3B. The pedestal portion 3D includes a first pedestal portion 3D1 and a second pedestal portion 3D2, the protrusion portion 3T includes a first protrusion portion 3T1 and a second protrusion portion 3T2, and the outer wall portion 3W includes a first outer wall portion 3W1 and a second outer wall portion 3W2. The first base portion 3D1 and the second base portion 3D2 are arranged to face each other in one diagonal direction across the optical axis OA, the first protrusion portion 3T1 and the second protrusion portion 3T2 are arranged to face each other in the other diagonal direction across the optical axis OA, and the first outer wall portion 3W1 and the second outer wall portion 3W2 are arranged to face each other in the other diagonal direction across the optical axis OA. More specifically, the main body 3B includes four sides 3E (first side 3E1 to fourth side 3E4). A first protrusion 3T1 and a first outer wall 3W1 are provided between the fourth side 3E4 and the first side 3E1. A second pedestal 3D2 is provided between the first side 3E1 and the second side 3E2. The second protrusion 3T2 and the second outer wall 3W2 are provided between the second side 3E2 and the third side 3E3. The first pedestal 3D1 is provided between the third side 3E3 and the fourth side 3E4. A portion of the leaf spring 6 is placed on the upper surface of each of the first pedestal 3D1 and the second pedestal 3D2. A base-side metal member 5F is attached to each side surface of the first pedestal 3D1 and the second pedestal 3D2.

[0028] As shown in Fig. 4, a base-side magnetic member BM is fixed to a recess 3R formed on the outer surface of the outer wall 3W. Specifically, a first base-side magnetic member BM1 is adhesively fixed to a first recess 3R1 formed on the right side surface of the first outer wall 3W1. Similarly, a second base-side magnetic member BM2 is adhesively fixed to a second recess (not visible in Fig. 4) formed on the left side surface of the second outer wall 3W2.

[0029] The protruding portion 3T constitutes a guide portion GD together with the receiving member 9. The guide portion GD constitutes a guide mechanism GM together with the guided portion GE.

[0030] The base-side magnetic member BM cooperates with the lens-side magnetic member LM fixed to the lens holding member 2 and the support-side magnetic member SM fixed to the support member 8 to prevent the base member 3 from separating from the lens holding member 2 and the support member 8. Specifically, as shown in FIG. 2 , the base-side magnetic member BM is adhesively fixed to the base member 3 so as to magnetically attract the lens-side magnetic member LM adhesively fixed to the lens holding member 2, and so as to magnetically attract the support-side magnetic member SM adhesively fixed to the support member 8. In the illustrated example, the base-side magnetic member BM is a permanent magnet magnetized with two poles along the Z-axis direction, and includes a first base-side magnetic member BM1 and a second base-side magnetic member BM2.

[0031] 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 as shown in FIG. 2 , includes a base-side metal member 5F, a lens-side metal member 5M, a supported-side metal member 5G, and a supporting-side metal member 5N. The base-side metal member 5F is configured so as to be fixed to a side surface of the pedestal portion 3D of the base member 3. The lens-side metal member 5M is configured so as to be fixed to a side surface of the pedestal portion 2D of the lens holding member 2. The supported-side metal member 5G is configured so as to be fixed to the lower surface of the base member 3. The supporting-side metal member 5N is configured so as to be fixed to the upper surface of the supporting member 8. Note that 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. Furthermore, the supported-side metal member 5G may be embedded in the base member 3, and the supporting-side metal member 5N may be embedded in the supporting member 8.

[0032] More specifically, the base-side metal member 5F includes a first base-side metal member 5F1 to a fourth base-side metal member 5F4, the lens-side metal member 5M includes a first lens-side metal member 5M1 and a second lens-side metal member 5M2, the supported-side metal member 5G includes a first supported-side metal member 5G1 to a fourth supported-side metal member 5G4, and the supporting-side metal member 5N includes a first supporting-side metal member 5N1 and a second supporting-side metal member 5N2.

[0033] 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 a pedestal portion 2D (a first pedestal portion 2D1 and a second pedestal portion 2D2) formed on the lens holding member 2 to a pedestal portion 3D (a first pedestal portion 3D1 and a second pedestal portion 3D2) 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).

[0034] The leaf spring 6 also functions as a member for supplying current to the shape memory alloy wire SA. Specifically, as shown in Fig. 3, the leaf spring 6 has a base-side joint 6F fixed to the base member 3, a lens-side joint 6M fixed to the lens holding member 2, and an elastically deformable elastic arm 6G connecting the base-side joint 6F and the lens-side joint 6M. In the illustrated example, the leaf spring 6 includes a first leaf spring 6A and a second leaf spring 6B, the first leaf spring 6A includes a first base-side joint 6FA, a first lens-side joint 6MA, and a first elastic arm 6GA, and the second leaf spring 6B includes a second base-side joint 6FB, a second lens-side joint 6MB, and a second elastic arm 6GB.

[0035] The flexible metal member 7 is a member for supplying current to the shape memory alloy wire SB. Specifically, as shown in Fig. 4, the flexible metal member 7 has a fixed joint 7F fixed to the support member 8, a movable joint 7M fixed to the base member 3, and an elastically deformable elastic arm 7G connecting the fixed joint 7F and the movable joint 7M. In the illustrated example, the flexible metal member 7 includes a first flexible metal member 7A and a second flexible metal member 7B, where the first flexible metal member 7A includes a first fixed joint 7FA, a first movable joint 7MA, and a first elastic arm 7GA, and the second flexible metal member 7B includes a second fixed joint 7FB, a second movable joint 7MB, and a second elastic arm 7GB.

[0036] 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, as shown in FIG. 2, the support member 8 has a substantially rectangular outer shape in a plan view (top view) and has a substantially rounded rectangular opening 8K in the center. The support member 8 also has a rectangular annular base 8B formed to surround the opening 8K.

[0037] The support member 8 also has a base portion 8D on which the support-side metal member 5N is attached. In the illustrated example, the support member 8 includes a first base portion 8D1 on which the first support-side metal member 5N1 is placed, and a second base portion 8D2 on which the second support-side metal member 5N2 is placed.

[0038] The receiving member 9 constitutes the guide portion GD together with the protruding portion 3T of the base member 3. The guide portion GD constitutes the guide mechanism GM that guides the movement of the lens holding member 2 in the optical axis direction relative to the base member 3 together with the guided portion GE. In the illustrated example, as shown in FIG. 2, the receiving member 9 is a cylindrical member made of metal, and includes a first receiving member 9A that constitutes the first guide portion GD1 and a second receiving member 9B that constitutes the second guide portion GD2.

[0039] Specifically, the guide mechanism GM includes a first guide mechanism GM1 and a second guide mechanism GM2, the first guide mechanism GM1 being composed of a first guiding portion GD1 and a first guided portion GE1, and the second guide mechanism GM2 being composed of a second guide portion GD2 and a second guided portion GE2. The first guide portion GD1 is composed of a first protruding portion 3T1 and a first receiving member 9A, and the second guide portion GD2 is composed of a second protruding portion 3T2 and a second receiving member 9B. In the illustrated example, the first receiving member 9A is fitted into and adhesively fixed to a U-shaped groove 3V formed in the first protruding portion 3T1 and extending along the optical axis direction, and the second receiving member 9B is fitted into and adhesively fixed to a U-shaped groove 3V formed in the second protruding portion 3T2 and extending along the optical axis direction. The lens holding member 2 is arranged so that the first guided portion GE1 (groove portion 2V) slides on the surface of the first receiving member 9A, and the second guided portion GE2 (flat portion 2F) slides on the surface of the second receiving member 9B.

[0040] The receiving member 9 may be integrated with the protruding portion 3T of the base member 3. In other words, the receiving member 9 may be a part of the protruding portion 3T formed of synthetic resin.

[0041] Alternatively, the receiving member 9 may constitute the guided portion GE together with the guided wall portion GW of the lens holding member 2. In this case, the receiving member 9 is adhesively fixed to the inner surface of the guided wall portion GW, and the base member 3 is arranged so that the receiving member 9 as the guided portion GE slides on the surface of the protrusion 3T. Alternatively, the receiving member 9 may be integrated with the guided wall portion GW. In other words, the receiving member 9 may be part of the guided wall portion GW formed of synthetic resin.

[0042] The flexible wiring board 11 is a flexible wiring board including a conductive pattern, and is configured to be able to electrically connect an external current supply source (control circuit) and the shape memory alloy wire. In the illustrated example, the flexible wiring board 11 includes a first flexible wiring board 11Y1 and a second flexible wiring board 11Y2, as shown in Figure 2, and is configured to be able to supply current to the shape memory alloy wire.

[0043] The lens-side magnetic member LM 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 LM is attached to the lens holding member 2 so that the lens holding member 2 (lens-side magnetic member LM) is attracted to the base member 3 (base-side magnetic member BM) by a magnetic attractive force acting between the lens-side magnetic member LM and the base-side magnetic member BM fixed to the base member 3, thereby centering the lens holding member 2 in the XY plane. In the illustrated example, the lens-side magnetic member LM is a metal plate made of a magnetic metal and includes a first lens-side magnetic member LM1 and a second lens-side magnetic member LM2. However, the lens-side magnetic member LM 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 lens-side magnetic member LM and the base-side magnetic member BM.

[0044] The embedded member 30 is a metal member embedded in the base member 3. Specifically, the embedded member 30 has a joining portion exposed on the surface of the base member 3 and used for joining to the metal member 5 or the flexible metal member 7. In the illustrated example, the embedded member 30 includes a first embedded member 30A to a twelfth embedded member 30L, as shown in FIG.

[0045] The support-side magnetic member SM cooperates with the base-side magnetic member BM fixed to the base member 3 to prevent the base member 3 from separating from the support member 8. In the illustrated example, the support-side magnetic member SM is a rectangular, annular, flat metal plate made of a magnetic metal. However, the support-side magnetic member SM 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 support-side magnetic member SM and the base-side magnetic member BM. The support-side magnetic member SM may also be embedded in the support member 8 by insert molding or the like. Specifically, as shown in FIG. 2, the support-side magnetic member SM has a substantially rectangular outer shape in a plan view (top view) and has a substantially rounded rectangular opening SMK in the center.

[0046] 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 FIGS.

[0047] In the example shown in FIG. 3, the first lens side metal member 5M1 is fixed to the front surface of the first pedestal portion 2D1 (the first mounting wall portion MW1, which is the front side (X1 side) 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. The adhesive is, for example, a light-curing adhesive. The light-curing adhesive is, for example, an ultraviolet-curing adhesive or a visible-light-curing adhesive. Similarly, the second lens side metal member 5M2 is fixed to the rear surface of the second pedestal portion 2D2 (the second mounting wall portion MW2, which is the rear side (X2 side) of the second pedestal portion 2D2). The lens side metal member 5M may be fixed to the pedestal portion 2D by caulking or the like.

[0048] The first lens side magnetic member LM1 is adhesively fixed to a first recess 2R1 formed on the right side surface of the first pedestal portion 2D1 (a first guided wall portion GW1 that is the right (Y2 side) portion of the first pedestal portion 2D1). Similarly, the second lens side magnetic member LM2 is adhesively fixed to a second recess (not visible in FIG. 3) formed on the left side surface of the second pedestal portion 2D2 (a second guided wall portion GW2 that is the left (Y1 side) portion of the second pedestal portion 2D2).

[0049] The leaf spring 6 has a base-side joint 6F fixed to the pedestal 3D (see FIG. 2) of the base member 3, a lens-side joint 6M fixed to the pedestal 2D of the lens holding member 2, and a resilient arm 6G connecting the base-side joint 6F and the lens-side joint 6M. Specifically, the leaf spring 6 includes a first leaf spring 6A and a second leaf spring 6B. The first leaf spring 6A has a first base-side joint 6FA, a first lens-side joint 6MA, and a first resilient arm 6GA connecting the first base-side joint 6FA and the first lens-side joint 6MA. Similarly, the second leaf spring 6B has a second base-side joint 6FB, a second lens-side joint 6MB, and a second resilient arm 6GB connecting the second base-side joint 6FB and the second lens-side joint 6MB.

[0050] As shown in Fig. 3, the first lens side bonding portion 6MA has a first through-hole 6H1 formed therein, through which a round protrusion 2P protruding upward and formed on the upper surface of the first pedestal portion 2D1 is inserted. The second lens side bonding portion 6MB has a first through-hole 6H1 formed therein, through which a round protrusion 2P protruding upward and formed on the upper surface of the second pedestal portion 2D2 is inserted. In the illustrated example, the leaf spring 6 and the protrusion 2P are bonded together with an adhesive. However, the leaf spring 6 and the protrusion 2P may also be bonded together by hot or cold caulking the protrusion 2P.

[0051] 4, the first base-side joint 6FA has a second through-hole 6H2 formed therein, through which a round protrusion 3P protruding upward and formed on the upper surface of the first pedestal 3D1 is inserted. The second base-side joint 6FB has a second through-hole 6H2 formed therein, through which a round protrusion 3P protruding upward and formed on the upper surface of the second pedestal 3D2 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.

[0052] 3, the first leaf spring 6A and the second leaf spring 6B are arranged so as to have two-fold rotational symmetry about the optical axis OA. Therefore, the first leaf spring 6A and the second leaf spring 6B can support the lens holding member 2 in good balance in the air. Furthermore, the first leaf spring 6A and the second leaf spring 6B do not adversely affect the weight balance of the lens holding member 2 supported by the four shape memory alloy wires SA (first wire SA1 to fourth wire SA4).

[0053] Next, the positional relationship between the base member 3 and members that come into contact with the base member 3 will be described with reference to FIGS.

[0054] 4, the base-side metal member 5F is fixed to the outer surface of the pedestal portion 3D of the base member 3. Specifically, the first base-side metal member 5F1 and the second base-side metal member 5F2 are fixed to the front side surface of the second pedestal portion 3D2 of the base member 3, and the third base-side metal member 5F3 and the fourth base-side metal member 5F4 are fixed to the rear side surface of the first pedestal portion 3D1 of the base member 3.

[0055] The embedded members 30 are embedded in the base member 3 so as to be partially exposed from the surface of the base member 3. Specifically, as shown in Fig. 6 , the first embedded member 30A to the sixth embedded member 30F are embedded in the base member 3 with the first terminal portion 30AT to the sixth terminal portion 30FT exposed from the upper surface of the second side portion 3E2 of the base member 3, respectively, and the seventh embedded member 30G to the twelfth embedded member 30L are embedded in the base member 3 with the seventh terminal portion 30GT to the twelfth terminal portion 30LT exposed from the upper surface of the fourth side portion 3E4 of the base member 3, respectively. Also, as shown in FIG. 6, the first embedded member 30A exposes the first joint 30AP from the top surface of the second base portion 3D2, the second embedded member 30B exposes the second joint 30BP from the front side surface of the first side portion 3E1, the third embedded member 30C exposes the third joint 30CP from the front side surface of the first side portion 3E1, the seventh embedded member 30G exposes the seventh joint 30GP from the top surface of the first base portion 3D1, the eighth embedded member 30H exposes the eighth joint 30HP from the rear side surface of the third side portion 3E3, and the ninth embedded member 30I exposes the ninth joint 30IP from the rear side surface of the third side portion 3E3. As shown in FIG. 5, the fourth embedded member 30D to the sixth embedded member 30F each expose the fourth joint portion 30DP to the sixth joint portion 30FP from the underside of the left rear corner of the main body portion 3B of the base member 3, and the tenth embedded member 30J to the twelfth embedded member 30L each expose the tenth joint portion 30JP to the twelfth joint portion 30LP from the underside of the right front corner of the main body portion 3B of the base member 3.

[0056] The first supported metal member 5G1 is fixed to the underside of the right front corner of the main body 3B of the base member 3 and is joined to the tenth joint 30JP. The second supported metal member 5G2 is fixed to the underside of the left rear corner of the main body 3B of the base member 3 and is joined to the sixth joint 30FP. The third supported metal member 5G3 is fixed to the underside of the left rear corner of the main body 3B of the base member 3 and is joined to the fourth joint 30DP. The fourth supported metal member 5G4 is fixed to the underside of the right front corner of the main body 3B of the base member 3 and is joined to the twelfth joint 30LP. In the illustrated example, the supported metal member 5G and the embedded member 30 are joined by welding. However, the supported metal member 5G and the embedded member 30 may be joined using a conductive adhesive, solder, or the like.

[0057] The first movable joint 7MA of the first flexible metal member 7A is fixed to the underside of the right front corner of the main body 3B of the base member 3 and is joined to the eleventh joint 30KP. The second movable joint 7MB of the second flexible metal member 7B is fixed to the underside of the left rear corner of the main body 3B of the base member 3 and is joined to the fifth joint 30EP. In the illustrated example, the flexible metal member 7 and the embedded member 30 are joined by welding. However, the flexible metal member 7 and the embedded member 30 may also be joined by a conductive adhesive, solder, or the like.

[0058] Next, the positional relationship between the support member 8 and the members attached to the support member 8 will be described with reference to Fig. 7. Fig. 7 is a perspective view of the support-side metal member 5N, the flexible metal member 7, the support member 8, the flexible wiring board 11, and the support-side magnetic member SM. Specifically, the upper view in Fig. 7 (the view above the block arrow) is an exploded perspective view, and the lower view in Fig. 7 (the view below the block arrow) is an assembled perspective view.

[0059] The first fixed joint 7FA of the first flexible metal member 7A is fixed to the first pedestal 8D1 of the support member 8 together with the first support-side metal member 5N1, and the second fixed joint 7FB of the second flexible metal member 7B is fixed to the second pedestal 8D2 of the support member 8 together with the second support-side metal member 5N2. Specifically, the first fixed joint 7FA and the first support-side metal member 5N1 each have a through-hole through which a round protrusion 8P formed on the upper surface of the first pedestal 8D1 and protruding upward is inserted. Furthermore, the second fixed joint 7FB and the second support-side metal member 5N2 each have a through-hole through which a round protrusion 8P formed on the upper surface of the second pedestal 8D2 and protruding upward is inserted. In the illustrated example, the flexible metal member 7 and the support-side metal member 5N are bonded to the protrusion 8P with an adhesive. However, the flexible metal member 7 and the support-side metal member 5N may be joined to the protrusion 8P by hot or cold caulking the protrusion 8P. The first fixed joint 7FA has a rounded rectangular through-hole formed therein for use in welding to the first support-side metal member 5N1. That is, the first fixed joint 7FA and the first support-side metal member 5N1 are joined by welding. However, the first fixed joint 7FA and the first support-side metal member 5N1 may also be joined by a conductive adhesive, solder, or the like. The same applies to the joint between the second fixed joint 7FB and the second support-side metal member 5N2.

[0060] 5, some of the embedded member 30 (the third embedded member 30C, the fourth embedded member 30D, and the tenth embedded member 30J) have exposed portions (the third exposed portion 30CQ, the fourth exposed portion 30DQ, and the tenth exposed portion 30JQ) that are exposed on the lower surface of the base member 3. As shown in FIG. 7, the support member 8 has a plurality of contact portions 8T that protrude upward from the base portion 8B and whose tip portions come into contact with lower guided portions LGE that are part of the exposed portions of the embedded member 30. Each of the three contact portions 8T, which have a shape combining a cylinder and a hemisphere, functions as a lower guiding portion LGD, and the exposed portion of the embedded member 30 functions as a lower guided portion LGE. The lower guided portions LGE and the lower guiding portions LGD constitute a lower guide mechanism LGM that guides the movement of the base member 3 relative to the support member 8 in a direction perpendicular to the optical axis.

[0061] In the illustrated example, the contact portion 8T includes a first contact portion 8T1 functioning as the first lower guide portion LGD1, a second contact portion 8T2 functioning as the second lower guide portion LGD2, and a third contact portion 8T3 functioning as the third lower guide portion LGD3. The exposed portion of the embedded member 30 includes a third exposed portion 30CQ functioning as the first lower guided portion LGE1, a fourth exposed portion 30DQ functioning as the second lower guided portion LGE2, and a tenth exposed portion 30JQ functioning as the third lower guided portion LGE3. The first lower guide portion LGD1 and the first lower guided portion LGE1 form a first lower guide mechanism LGM1, the second lower guide portion LGD2 and the second lower guided portion LGE2 form a second lower guide mechanism LGM2, and the third lower guide portion LGD3 and the third lower guided portion LGE3 form a third lower guide mechanism LGM3.

[0062] Specifically, the first lower guide portion LGD1 (first contact portion 8T1) contacts the underside of the first lower guided portion LGE1, which is part of the third exposed portion 30CQ of the third embedded member 30C, the second lower guide portion LGD2 (second contact portion 8T2) contacts the underside of the second lower guided portion LGE2, which is part of the fourth exposed portion 30DQ of the fourth embedded member 30D, and the third lower guide portion LGD3 (third contact portion 8T3) contacts the underside of the third lower guided portion LGE3, which is part of the tenth exposed portion 30JQ of the tenth embedded member 30J.

[0063] This configuration has the advantage that the embedded member 30 can be used as the lower guided portion LGE 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 embedded member 30, which is made of metal and is less likely to deform than synthetic resin, can be used as the lower guided portion LGE. Furthermore, sliding between the metal (embedded member 30) and the synthetic resin (contact portion 8T) can prevent the synthetic resin from being worn away compared to when two synthetic resins slide against each other. Therefore, this configuration has the advantage of making it less likely to generate wear powder. Note that the number of contact portions 8T may be four or more. That is, the number of lower guide mechanisms LGM may be four or more.

[0064] 5, a recess 8R for accommodating one end 11R of the flexible wiring board 11 is formed on the lower surface of the support member 8. The support-side magnetic member SM is also provided with a cutout SMC corresponding to the one end 11R of the flexible wiring board 11. The one end 11R of the flexible wiring board 11 is bonded to a terminal (not shown) formed on the substrate SU, and the other end 11S of the flexible wiring board 11 is disposed on the upper surface of the base member 3 and bonded to a terminal of the embedding member 30. Specifically, the recess 8R includes a first recess 8R1 for accommodating one end 11R1 of the first flexible wiring board 11Y1 and a second recess 8R2 for accommodating one end 11R2 of the second flexible wiring board 11Y2. The cutout SMC includes a first cutout SMC1 corresponding to the one end 11R1 of the first flexible wiring board 11Y1 and a second cutout SMC2 corresponding to the one end 11R2 of the second flexible wiring board 11Y2. The other end 11S1 of the first flexible wiring board 11Y1 is placed on the upper surface of the second side 3E2 of the base member 3 and is joined to the terminal portions (the first terminal portion 30AT to the sixth terminal portion 30FT) of the first to sixth embedded members 30A to 30F, respectively. The other end 11S2 of the second flexible wiring board 11Y2 is placed on the upper surface of the fourth side 3E4 of the base member 3 and is joined to the terminal portions (the seventh terminal portion 30GT to the twelfth terminal portion 30LT) of the seventh to twelfth embedded members 30G to 30L, respectively.

[0065] Next, the metal member 5 to which the shape memory alloy wire is attached will be described with reference to FIG. 8. FIG. 8 is a diagram showing a configuration example of the metal member 5 and the shape memory alloy wire. Specifically, the upper view of FIG. 8 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, and the first wire SA1 to the fourth wire SA4. The lower view of FIG. 8 is a perspective view of the first supported side metal member 5G1 to the fourth supported side metal member 5G4, the first supporting side metal member 5N1, the second supporting side metal member 5N2, and the first wire SB1 to the fourth wire SB4. The positional relationship of the members shown in FIG. 8 corresponds to the positional relationship when the lens driving device 101 is in a neutral state.

[0066] 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, and the other end of the first wire SA1 is fixed to the first lens metal member 5M1 at the holding portion J2 of the first lens metal member 5M1. Similarly, one end of the second wire SA2 is fixed to the second base metal member 5F2 at the holding portion J3 of the second base metal member 5F2, and the other end of the second wire SA2 is fixed to the first lens metal member 5M1 at the holding portion J4 of the first lens metal member 5M1.

[0067] One end of the third wire SA3 is fixed to the third base metal member 5F3 at a holding portion J5 of the third base metal member 5F3, and the other end of the third wire SA3 is fixed to the second lens metal member 5M2 at a holding portion J6 of the second lens metal member 5M2. Similarly, one end of the fourth wire SA4 is fixed to the fourth base metal member 5F4 at a holding portion J7 of the fourth base metal member 5F4, and the other end of the fourth wire SA4 is fixed to the second lens metal member 5M2 at a holding portion J8 of the second lens metal member 5M2.

[0068] One end of the first wire SB1 is fixed to the second supporting metal member 5N2 at a holding portion J9 of the second supporting metal member 5N2, and the other end of the first wire SB1 is fixed to the first supported metal member 5G1 at a holding portion J10 of the first supported metal member 5G1. Similarly, one end of the second wire SB2 is fixed to the second supporting metal member 5N2 at a holding portion J11 of the second supporting metal member 5N2, and the other end of the second wire SB2 is fixed to the second supported metal member 5G2 at a holding portion J12 of the second supported metal member 5G2.

[0069] One end of the third wire SB3 is fixed to the first supporting metal member 5N1 at a holding portion J13 of the first supporting metal member 5N1, and the other end of the third wire SB3 is fixed to the third supported metal member 5G3 at a holding portion J14 of the third supported metal member 5G3. Similarly, one end of the fourth wire SB4 is fixed to the first supporting metal member 5N1 at a holding portion J15 of the first supporting metal member 5N1, and the other end of the fourth wire SB4 is fixed to the fourth supported metal member 5G4 at a holding portion J16 of the fourth supported metal member 5G4.

[0070] 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 J16.

[0071] The base member 3 is configured to function as a wire support member that supports one end of each of the first to fourth wires SA1 to SA4. With this configuration, the lens holding member 2, where the other end of each of the first to fourth wires SA1 to SA4 is located, is connected to the base member 3 via the first to fourth wires SA1 to SA4 in a state that is movable in the optical axis direction (Z-axis direction), which is a direction parallel to the optical axis OA.

[0072] Furthermore, the support member 8 is configured to function as a wire support member that supports one end of each of the first to fourth wires SB1 to SB4. With this configuration, the base member 3 on which the other end of each of the first to fourth wires SB1 to SB4 is located is connected to the support member 8 via the first to fourth wires SB1 to SB4 in a state that is movable in directions (X-axis and Y-axis directions) perpendicular to the optical axis OA.

[0073] 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. 8, 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 base member 3 or the lens holding member 2 so that the plate surfaces of the base portions BPF1, BPF2, BPF3, BPF4, BPM1, and BPM2 are parallel to the YZ plane, that is, so that they are approximately parallel to each other. Also, the first base side metal member 5F1, the second base side metal member 5F2, and the first lens side metal member 5M1 are attached to the base member 3 or the lens holding member 2 so that the plate surfaces of the base portions BPF1, BPF2, and BPM1 are positioned on approximately the same plane. Similarly, the third base side metal member 5F3, the fourth base side metal member 5F4, and the second lens side metal member 5M2 are attached to the base member 3 or the lens holding member 2 so that the plate surfaces of the base part BPF3, the base part BPF4, and the base part BPM2 are positioned on approximately the same plane.

[0074] In the illustrated example, each of the supported metal member 5G and the supporting metal member 5N is made of a metal plate having a plate-shaped base portion BP. Specifically, the first supported metal member 5G1 has a base portion BPG1, the second supported metal member 5G2 has a base portion BPG2, the third supported metal member 5G3 has a base portion BPG3, the fourth supported metal member 5G4 has a base portion BPG4, the first supporting metal member 5N1 has a base portion BPN1, and the second supporting metal member 5N2 has a base portion BPN2. 8, the first supported side metal member 5G1, the second supported side metal member 5G2, the third supported side metal member 5G3, the fourth supported side metal member 5G4, the first supporting side metal member 5N1, and the second supporting side metal member 5N2 are attached to the base member 3 or the support member 8 so that the plate surfaces of the base portions BPG1, BPG2, BPG3, BPG4, BPN1, and BPN2 are parallel to the XY plane, that is, so that they are approximately parallel to each other. Also, the first supported side metal member 5G1, the second supported side metal member 5G2, the third supported side metal member 5G3, and the fourth supported side metal member 5G4 are attached to the base member 3 so that the plate surfaces of the base portions BPG1, BPG2, BPG3, and BPG4 are positioned on approximately the same plane. Similarly, the first supporting metal member 5N1 and the second supporting metal member 5N2 are attached to the supporting member 8 so that the plate surfaces of the base portions BPN1 and BPN2 are positioned on approximately the same plane.

[0075] Next, the positional relationship of the metal member 5, the leaf spring 6, the flexible metal member 7, the flexible wiring board 11, the embedded member 30, the shape memory alloy wire SA, and the shape memory alloy wire SB, which are members through which current flows, will be described with reference to Figures 9, 10, and 11. Figure 9 is a perspective view of the metal member 5, the leaf spring 6, the flexible metal member 7, the flexible wiring board 11, the embedded member 30, the shape memory alloy wire SA, and the shape memory alloy wire SB. Specifically, the upper view of Figure 9 is a perspective view of members related to the current path including the shape memory alloy wire SA, and the lower view of Figure 9 is a perspective view of members related to the current path including the shape memory alloy wire SB. Fig. 10 is a diagram of a portion of Fig. 9, in which the upper left view of Fig. 10 shows components related to the current path including the first wire SA1, the lower left view of Fig. 10 shows components related to the current path including the second wire SA2, the upper right view of Fig. 10 shows components related to the current path including the third wire SA3, and the lower right view of Fig. 10 shows components related to the current path including the fourth wire SA4. Fig. 11 is a diagram of a portion of Fig. 9, in which the lower left view of Fig. 11 shows components related to the current path including the first wire SB1, the upper left view of Fig. 11 shows components related to the current path including the second wire SB2, the upper right view of Fig. 11 shows components related to the current path including the third wire SB3, and the lower right view of Fig. 11 shows components related to the current path including the fourth wire SB4.

[0076] As shown in the upper left diagram of Figure 10, when the third terminal portion 11C of the first flexible wiring board 11Y1 is connected to a high potential and the seventh terminal portion 11G of the second flexible wiring board 11Y2 is connected to a low potential, current flows from the third terminal portion 11C of the first flexible wiring board 11Y1 through the third terminal portion 30CT of the third embedded member 30C, the third joint portion 30CP, the first base side metal member 5F1 (the base portion BPF1 and the holding portion J1), the first wire SA1, the first lens side metal member 5M1 (the holding portion J2, the base portion BPM1, and the first extension portion EX1), the first plate spring 6A (the first lens side joint portion 6MA, the first elastic arm portion 6GA, and the first base side joint portion 6FA), and the seventh embedded member 30G (the seventh joint portion 30GP and the seventh terminal portion 30GT) to the seventh terminal portion 11G of the second flexible wiring board 11Y2.

[0077] Furthermore, as shown in the lower left diagram of Figure 10, when the second terminal portion 11B of the first flexible wiring board 11Y1 is connected to a high potential and the seventh terminal portion 11G of the second flexible wiring board 11Y2 is connected to a low potential, current flows from the second terminal portion 11B of the first flexible wiring board 11Y1 through the second terminal portion 30BT of the second embedded member 30B, the second joint portion 30BP, the second base side metal member 5F2 (the base portion BPF2 and the holding portion J3), the second wire SA2, the first lens side metal member 5M1 (the holding portion J4, the base portion BPM1, and the first extension portion EX1), the first plate spring 6A (the first lens side joint portion 6MA, the first elastic arm portion 6GA, and the first base side joint portion 6FA), and the seventh embedded member 30G (the seventh joint portion 30GP and the seventh terminal portion 30GT) to the seventh terminal portion 11G of the second flexible wiring board 11Y2.

[0078] In addition, whether the third terminal portion 11C of the first flexible wiring board 11Y1 is connected to a high potential or the second terminal portion 11B of the first flexible wiring board 11Y1 is connected to a high potential, the path of the current flowing from the first lens side metal member 5M1 to the seventh terminal portion 11G of the second flexible wiring board 11Y2 is the same.

[0079] Furthermore, as shown in the upper right diagram of Figure 10, when the ninth terminal portion 11I of the second flexible wiring board 11Y2 is connected to a high potential and the first terminal portion 11A of the first flexible wiring board 11Y1 is connected to a low potential, current flows from the ninth terminal portion 11I of the second flexible wiring board 11Y2 through the ninth terminal portion 30IT of the ninth embedded member 30I, the ninth joint portion 30IP, the third base side metal member 5F3 (the base portion BPF3 and the holding portion J5), the third wire SA3, the second lens side metal member 5M2 (the holding portion J6, the base portion BPM2, and the second extension portion EX2), the second plate spring 6B (the second lens side joint portion 6MB, the second elastic arm portion 6GB, and the second base side joint portion 6FB), and the first embedded member 30A (the first joint portion 30AP and the first terminal portion 30AT) to the first terminal portion 11A of the first flexible wiring board 11Y1.

[0080] Furthermore, as shown in the lower right diagram of Figure 10, when the eighth terminal portion 11H of the second flexible wiring board 11Y2 is connected to a high potential and the first terminal portion 11A of the first flexible wiring board 11Y1 is connected to a low potential, current flows from the eighth terminal portion 11H of the second flexible wiring board 11Y2 through the eighth terminal portion 30HT of the eighth embedded member 30H, the eighth joint portion 30HP, the fourth base side metal member 5F4 (the base portion BPF4 and the holding portion J7), the fourth wire SA4, the second lens side metal member 5M2 (the holding portion J8, the base portion BPM2, and the second extension portion EX2), the second plate spring 6B (the second lens side joint portion 6MB, the second elastic arm portion 6GB, and the second base side joint portion 6FB), and the first embedded member 30A (the first joint portion 30AP and the first terminal portion 30AT) to the first terminal portion 11A of the first flexible wiring board 11Y1.

[0081] In addition, whether the ninth terminal portion 11I of the second flexible wiring board 11Y2 is connected to a high potential or the eighth terminal portion 11H of the second flexible wiring board 11Y2 is connected to a high potential, the path of the current flowing from the second lens side metal member 5M2 to the first terminal portion 11A of the first flexible wiring board 11Y1 is the same.

[0082] Furthermore, as shown in the lower left diagram of Figure 11, when the tenth terminal portion 11J of the second flexible wiring board 11Y2 is connected to a high potential and the fifth terminal portion 11E of the first flexible wiring board 11Y1 is connected to a low potential, current flows from the tenth terminal portion 11J of the second flexible wiring board 11Y2 through the tenth terminal portion 30JT of the tenth embedded member 30J, the tenth joint portion 30JP, the first supported side metal member 5G1 (base portion BPG1 and holding portion J10), the first wire SB1, the second supporting side metal member 5N2 (holding portion J9 and base portion BPN2), the second flexible metal member 7B (second fixed joint portion 7FB, second elastic arm portion 7GB, and second movable joint portion 7MB), and the fifth embedded member 30E (fifth joint portion 30EP and fifth terminal portion 30ET) to the fifth terminal portion 11E of the first flexible wiring board 11Y1.

[0083] Furthermore, as shown in the upper left diagram of Figure 11, when the sixth terminal portion 11F of the first flexible wiring board 11Y1 is connected to a high potential and the fifth terminal portion 11E of the first flexible wiring board 11Y1 is connected to a low potential, current flows from the sixth terminal portion 11F of the first flexible wiring board 11Y1 through the sixth terminal portion 30FT of the sixth embedded member 30F, the sixth joint portion 30FP, the second supported side metal member 5G2 (base portion BPG2 and holding portion J12), the second wire SB2, the second supporting side metal member 5N2 (holding portion J11 and base portion BPN2), the second flexible metal member 7B (second fixed joint portion 7FB, second elastic arm portion 7GB, and second movable joint portion 7MB), and the fifth embedded member 30E (fifth joint portion 30EP and fifth terminal portion 30ET) to the fifth terminal portion 11E of the first flexible wiring board 11Y1.

[0084] In addition, whether the tenth terminal portion 11J of the second flexible wiring board 11Y2 is connected to a high potential or the sixth terminal portion 11F of the first flexible wiring board 11Y1 is connected to a high potential, the path of the current flowing from the second support side metal member 5N2 to the fifth terminal portion 11E of the first flexible wiring board 11Y1 is the same.

[0085] Furthermore, as shown in the upper right diagram of Figure 11, when the fourth terminal portion 11D of the first flexible wiring board 11Y1 is connected to a high potential and the eleventh terminal portion 11K of the second flexible wiring board 11Y2 is connected to a low potential, current flows from the fourth terminal portion 11D of the first flexible wiring board 11Y1 through the fourth terminal portion 30DT of the fourth embedded member 30D, the fourth joint portion 30DP, the third supported side metal member 5G3 (base portion BPG3 and holding portion J14), the third wire SB3, the first supporting side metal member 5N1 (holding portion J13 and base portion BPN1), the first flexible metal member 7A (first fixed joint portion 7FA, first elastic arm portion 7GA, and first movable joint portion 7MA), and the eleventh embedded member 30K (eleventh joint portion 30KP and eleventh terminal portion 30KT) to the eleventh terminal portion 11K of the second flexible wiring board 11Y2.

[0086] 11, when the twelfth terminal portion 11L of the second flexible wiring board 11Y2 is connected to a high potential and the eleventh terminal portion 11K of the second flexible wiring board 11Y2 is connected to a low potential, a current flows from the twelfth terminal portion 11L of the second flexible wiring board 11Y2 to the twelfth terminal portion 30LT of the twelfth embedded member 30L, the twelfth joint portion 30LP, the fourth supported side metal member 5G4 (substrate The current flows through the first support side metal member 5N1 (holding portion J15 and base portion BPN1), the fourth wire SB4, the first support side metal member 5N1 (holding portion J16 and base portion BPN1), the first flexible metal member 7A (first fixed joint portion 7FA, first elastic arm portion 7GA, and first movable joint portion 7MA), and the 11th embedded member 30K (11th joint portion 30KP and 11th terminal portion 30KT) to the 11th terminal portion 11K of the second flexible wiring board 11Y2.

[0087] In addition, whether the fourth terminal portion 11D of the first flexible wiring board 11Y1 is connected to a high potential or the twelfth terminal portion 11L of the second flexible wiring board 11Y2 is connected to a high potential, the path of the current flowing from the first support side metal member 5N1 to the eleventh terminal portion 11K of the second flexible wiring board 11Y2 is the same.

[0088] A control device external to the lens driving device 101 as described above can control the lengths 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, for example, controlling the voltages applied to the terminals (first terminal 11A to twelfth terminal 11L) of the first flexible wiring board 11Y1 and the second flexible wiring board 11Y2. 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 results. The control device may be disposed within the lens driving device 101. Furthermore, the control device may be a component of the lens driving device 101.

[0089] 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 IS to enable macro photography, and move the lens holding member 2 toward the image sensor IS to enable infinity photography.

[0090] 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.

[0091] Here, referring again to FIG. 6, the relationship between the forces acting on the lens holding member 2 in the directions intersecting the optical axis OA (X-axis direction and Y-axis direction) will be described.

[0092] When current flows through at least one of the first wire SA1 and the second wire SA2 and causes them to contract, the lens holding member 2 (first base portion 2D1) is pulled to the left (Y1 direction), and the first guided portion GE1 (groove portion 2V) is pressed against the first receiving member 9A by a leftward pressing force PF (first pressing force PF1).

[0093] On the other hand, since a magnetic force MF (first magnetic force MF1 as an attractive force) acts between the first lens side magnetic member LM1 fixed to the lens holding member 2 and the first base side magnetic member BM1 fixed to the base member 3, the first guided portion GE1 (groove portion 2V) is pulled to the right (Y2 direction) by the rightward magnetic force MF (first magnetic force MF1).

[0094] Therefore, at least a portion of the leftward pressing force PF (first pressing force PF1) and the rightward magnetic force MF (first magnetic force MF1) cancel each other out, and the pressing force PF (first pressing force PF1) is suppressed. As a result, the first guided portion GE1 (groove portion 2V) is moved in the optical axis direction by a relatively small force in the optical axis direction (the component in the optical axis direction of the force by at least one of the first wire SA1 and the second wire SA2) compared to when the magnetic force MF (first magnetic force MF1) is not acting.

[0095] Similarly, when current flows through at least one of the third wire SA3 and the fourth wire SA4 and causes them to contract, the lens holding member 2 (second base portion 2D2) is pulled to the right (Y2 direction), and the second guided portion GE2 (flat portion 2F) is pressed against the second receiving member 9B by a rightward pressing force PF (second pressing force PF2).

[0096] On the other hand, since a magnetic force MF (second magnetic force MF2 as an attractive force) acts between the second lens side magnetic member LM2 fixed to the lens holding member 2 and the second base side magnetic member BM2 fixed to the base member 3, the second guided portion GE2 (flat portion 2F) is pulled to the left (Y1 direction) by the leftward magnetic force MF (second magnetic force MF2).

[0097] Therefore, at least a portion of the rightward pressing force PF (second pressing force PF2) and the leftward magnetic force MF (second magnetic force MF2) cancel each other out, and the pressing force PF (second pressing force PF2) is suppressed. As a result, the second guided portion GE2 (flat portion 2F) is moved in the optical axis direction by a relatively small force in the optical axis direction (the component in the optical axis direction of the force by at least one of the third wire SA3 and the fourth wire SA4) compared to when the magnetic force MF (second magnetic force MF2) is not acting.

[0098] Next, the positional relationships between the base-side magnetic member BM, the lens-side magnetic member LM, and the support-side magnetic member SM will be described with reference to Fig. 12. Fig. 12 is a three-view diagram (front view, top view, and right side view) of the base-side magnetic member BM, the lens-side magnetic member LM, and the support-side magnetic member SM. The positional relationships of the members shown in Fig. 12 correspond to the positional relationships when the lens driving device 101 is in a neutral state.

[0099] Specifically, the first base-side magnetic member BM1 and the first lens-side magnetic member LM1 are arranged to face each other with a gap GP1 in the Y-axis direction. The second base-side magnetic member BM2 and the second lens-side magnetic member LM2 are arranged to face each other with a gap GP2 in the Y-axis direction. In the illustrated example, the size of the gap GP1 is the same as the size of the gap GP2.

[0100] This arrangement has the effect of preventing the lens holding member 2 (lens side magnetic member LM) and the base member 3 (base side magnetic member BM) from separating from each other by utilizing the magnetic force acting between the base side magnetic member BM and the lens side magnetic member LM.

[0101] The first base-side magnetic member BM1 and the support-side magnetic member SM are arranged to face each other with a distance HT1 in the Z-axis direction. The second base-side magnetic member BM2 and the support-side magnetic member SM are arranged to face each other with a distance HT2 in the Z-axis direction. In the illustrated example, the size of the distance HT1 and the size of the distance HT2 are the same.

[0102] This arrangement has the effect of preventing the base member 3 (base side magnetic member BM) and the support member 8 (support side magnetic member SM) from separating from each other by utilizing the magnetic force acting between the base side magnetic member BM and the support side magnetic member SM.

[0103] Next, the lower guide mechanism LGM will be described in detail with reference to Fig. 13. Fig. 13 is a perspective view of the support member 8, the third embedded member 30C, the fourth embedded member 30D, and the tenth embedded member 30J. In Fig. 13, for clarity, the third embedded member 30C, the fourth embedded member 30D, and the tenth embedded member 30J are shown as transparent. Note that the positional relationship of each member shown in Fig. 13 corresponds to the positional relationship when the lens driving device 101 is in a neutral state.

[0104] The lower guide mechanism LGM is configured to guide movement of the base member 3 relative to the support member 8 in directions perpendicular to the optical axis OA (X-axis direction and Y-axis direction). Specifically, the lower guide mechanism LGM is configured to include a lower guiding portion LGD and a lower guided portion LGE. The lower guide mechanism LGM also includes a first lower guide mechanism LGM1, a second lower guide mechanism LGM2, and a third lower guide mechanism LGM3.

[0105] Specifically, the first lower guide mechanism LGM1 is configured to include a first lower guiding portion LGD1 and a first lower guided portion LGE1, the second lower guide mechanism LGM2 is configured to include a second lower guiding portion LGD2 and a second lower guided portion LGE2, and the third lower guide mechanism LGM3 is configured to include a third lower guiding portion LGD3 and a third lower guided portion LGE3.

[0106] In the illustrated example, the first lower guide portion LGD1, the second lower guide portion LGD2, and the third lower guide portion LGD3 are respectively the first contact portion 8T1, the second contact portion 8T2, and the third contact portion 8T3 provided on the upper surface of the base portion 8B of the support member 8. The first lower guided portion LGE1 is the third exposed portion 30CQ of the third embedded member 30C, the second lower guided portion LGE2 is the fourth exposed portion 30DQ of the fourth embedded member 30D, and the third lower guided portion LGE3 is the tenth exposed portion 30JQ of the tenth embedded member 30J. The first contact portion 8T1, the second contact portion 8T2, and the third contact portion 8T3 are all at the same height from the upper surface of the base portion 8B.

[0107] This lower guide mechanism LGM has the advantage of being able to smoothly guide the movement of the base member 3 relative to the support member 8 in directions (X-axis direction and Y-axis direction) perpendicular to the optical axis OA. This lower guide mechanism LGM also has the advantage of being able to use the embedded member 30, which is made of metal and is less likely to deform than synthetic resin, as the lower guided portion LGE. Furthermore, sliding between the metal (embedded member 30) and the synthetic resin (contact portion 8T) can prevent the synthetic resin from being worn away, compared to sliding between two synthetic resins. Therefore, this lower guide mechanism LGM has the advantage of being less likely to generate wear powder.

[0108] As described above, as shown in FIG. 2 , the lens driving device 101 according to the embodiment of the present disclosure includes a base member 3, a lens holding member 2 having a cylindrical portion 2C capable of holding a lens body LS and movable relative to the base member 3 in the optical axis direction, and a plurality of shape memory alloy wires SA (first driving unit DM1) disposed between the base member 3 and the lens holding member 2 for moving the lens holding member 2 in the optical axis direction. The shape memory alloy wires SA have one end supported by the base member 3 and the other end supported by the lens holding member 2 positioned at different positions in the optical axis direction. In the illustrated example, one end of the first wire SA1 is positioned higher than the other end, and one end of the second wire SA2 is positioned lower than the other end. Furthermore, one end of the third wire SA3 is positioned higher than the other end, and one end of the fourth wire SA4 is positioned lower than the other end. Furthermore, the base member 3 has a guiding portion GD that guides the movement of the lens holding member 2 in the optical axis direction, and the lens holding member 2 has a guided portion GE that is guided by the guiding portion GD. The lens driving device 101 is configured such that when an electric current is passed through the shape memory alloy wire SA, a pressing force PF (see Figure 6) acts on the guide portion GD and the guided portion GE, causing the guide portion GD and the guided portion GE to press against each other due to the contraction of the shape memory alloy wire SA, and the guided portion GE slides along the guide portion GD.

[0109] This configuration has the effect of stabilizing the movement of the lens holding member 2 in the optical axis direction because the guided portion GE slides on the surface of the guiding portion GD while being pressed against the guiding portion GD when the lens holding member 2 moves in the optical axis direction. In other words, this configuration has the effect of preventing the lens holding member 2 from tilting when it moves in the optical axis direction.

[0110] Preferably, a base-side magnetic member BM is provided on the base member 3, and a lens-side magnetic member LM is provided on the lens holding member 2. At least one of the base-side magnetic member BM and the lens-side magnetic member LM is made of a magnet, and a magnetic force MF acts between the base-side magnetic member BM and the lens-side magnetic member LM, as shown in Fig. 6, so as to reduce the pressing force PF when a current flows through the shape memory alloy wire SA.

[0111] This configuration has the effect of weakening the frictional force between the guiding portion GD and the guided portion GE by the magnetic force MF, even when the contraction force of the shape memory alloy wire SA increases when current is applied and the pressing force PF increases.

[0112] 2, the base member 3 preferably has a base-side metal member 5F to which one end of the shape memory alloy wire SA is fixed, and the lens holding member 2 preferably has a lens-side metal member 5M to which the other end of the shape memory alloy wire SA is fixed. The guiding portion GD and the guided portion GE are disposed at positions closer to the lens-side metal member 5M than to the base-side metal member 5F.

[0113] This configuration has the effect of stabilizing the movement of the lens holding member 2 in the optical axis direction, since the guiding portion GD and the guided portion GE are positioned closer to the lens side metal member 5M, which moves in the optical axis direction, than the base side metal member 5F, which does not move in the optical axis direction.

[0114] Preferably, as shown in FIG. 3, the lens side metal member 5M is formed of a metal plate having a plate-shaped base portion BP. The lens holding member 2 has a mounting wall portion MW to which the lens side metal member 5M is attached, and a guided wall portion GW formed along a plane (XZ plane) intersecting (substantially perpendicular to) a plane (YZ plane) along the plate surface of the base portion BP of the lens side metal member 5M. A guided portion GE is formed on the inner surface of the guided wall portion GW, and a lens side magnetic member LM is fixed to the outer surface of the guided wall portion GW. As shown in FIG. 2, the base member 3 has an outer wall portion 3W arranged outside the guided wall portion GW, and a base side magnetic member BM is fixed to the outer wall portion 3W. The base side magnetic member BM is formed of a magnet.

[0115] This configuration allows the base-side magnetic member BM and the lens-side magnetic member LM to be located near the guiding portion GD and the guided portion GE, and also reduces the distance between the base-side magnetic member BM and the lens-side magnetic member LM. Therefore, this configuration effectively increases the magnetic force MF acting between the base-side magnetic member BM and the lens-side magnetic member LM, and ultimately effectively reduces the frictional force between the guiding portion GD and the guided portion GE.

[0116] Preferably, as shown in Fig. 3, a through-hole TH is formed on the outside of the cylindrical portion 2C, penetrating in the optical axis direction and surrounded by an annular pedestal portion 2D including a mounting wall portion MW and a guided wall portion GW. As shown in Fig. 2, the base member 3 has a protrusion 3T that is inserted into the through-hole TH, and the protrusion 3T is provided with a guide portion GD. In the illustrated example, as shown in Fig. 6, the protrusion 3T has a U-shaped groove 3V that receives a substantially cylindrical receiving member 9. Specifically, the through-hole TH includes a first through-hole TH1 through which the first protrusion 3T1 is inserted, and a second through-hole TH2 through which the second protrusion 3T2 is inserted.

[0117] This configuration increases the strength of the guide portion GD, making it less likely to deform. In addition, this configuration makes it less likely to deform the guided portion GE.

[0118] Preferably, a pair of guide mechanisms GM, each consisting of a combination of a guiding portion GD and a guided portion GE, are provided on either side of the optical axis, as shown in Fig. 6. Each of the pair of guide mechanisms GM (first guide mechanism GM1 and second guide mechanism GM2) is provided to correspond to a plurality of shape memory alloy wires SA. In the illustrated example, the first guide mechanism GM1 is provided to correspond to the first wire SA1 and the second wire SA2, and the second guide mechanism GM2 is provided to correspond to the third wire SA3 and the fourth wire SA4.

[0119] This configuration brings about the effect that the movement of the lens holding member 2 in the optical axis direction is more stable than in a configuration with only one guide mechanism GM (a combination of a guiding portion GD and a guided portion GE).

[0120] 2, the base member 3 preferably has a plate-shaped main body 3B, with the lens holding member 2 disposed on one surface (Z1 side) of the main body 3B and the support member 8 disposed on the other surface (Z2 side) of the main body 3B. The main body 3B of the base member 3 is movable in a direction perpendicular to the optical axis direction relative to the support member 8, and another shape memory alloy wire SB (second drive unit DM2) is provided between the base member 3 and the support member 8 to move the base member 3 in a direction perpendicular to the optical axis direction.

[0121] This configuration brings about the effect of realizing an image stabilization function in addition to an automatic focus adjustment function.

[0122] Preferably, the main body 3B of the base member 3 is configured to be movable relative to the support member 8 in directions (X-axis direction and Y-axis direction) perpendicular to the optical axis direction (Z-axis direction) by at least three lower guide mechanisms LGM, as shown in FIG. 5. Specifically, the lower guide mechanisms LGM have a lower guiding portion LGD (see FIG. 7) provided on the support member 8 and a lower guided portion LGE (see FIG. 5) provided on the base member 3. The support member 8 has a support-side magnetic member SM, and the base-side magnetic member BM is made of a magnet. The base-side magnetic member BM and the support-side magnetic member SM are configured such that the lower guiding portion LGD and the lower guided portion LGE press against each other due to a magnetic force LMF acting between the base-side magnetic member BM and the support-side magnetic member SM, as shown in FIG. 12. In the illustrated example, as shown in FIG. 13 , the lower guiding portion LGD is a contact portion 8T provided on the upper surface of the base portion 8B of the support member 8, and the lower guided portion LGE is an exposed portion (a portion exposed from the lower surface of the base member 3) of a metal embedded member 30 embedded in the base member 3. However, the lower guided portion LGE may also be a portion of a member formed of synthetic resin, such as a portion of the lower surface of the base member 3. Specifically, as shown in FIG. 12 , the first base-side magnetic member BM1 and the support-side magnetic member SM are configured so that the lower guiding portion LGD and the lower guided portion LGE are pressed against each other by a first magnetic force LMF1 acting between the first base-side magnetic member BM1 and the support-side magnetic member SM. Furthermore, as shown in FIG. 12 , the second base-side magnetic member BM2 and the support-side magnetic member SM are configured so that the lower guiding portion LGD and the lower guided portion LGE are pressed against each other by a second magnetic force LMF2 acting between the second base-side magnetic member BM2 and the support-side magnetic member SM.

[0123] This configuration brings about the effect that the base-side magnetic member BM can be used not only to attract the lens-side magnetic member LM but also to attract the support-side magnetic member SM.

[0124] 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.

[0125] 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.

[0126] Furthermore, in the above-described embodiment, the lens side magnetic member LM, the base side magnetic member BM, and the support side magnetic member SM are adhesively fixed to the lens holding member 2, the base member 3, and the support member 8, respectively, but they may also be magnetic metals embedded in each member.

[0127] Furthermore, in the above-described embodiment, the lower guiding portion LGD is configured by a contact portion 8T provided on the upper surface of the support member 8, and the lower guided portion LGE is configured by a part of the embedded member 30 embedded in the base member 3. However, the lower guided portion LGE may be a contact portion provided on the lower surface of the base member 3 (a part of the base member 3 that protrudes downward and has a shape combining a cylinder and a hemisphere), and the lower guiding portion LGD may be a part of a metal member embedded in the support member 8. [Explanation of symbols]

[0128] 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 2F Flat portion 2P Projection portion 2R Recessed portion 2R1 First recessed portion 2V Groove portion 3 Base member 3B Main body portion 3D Base portion 3D1 First base portion 3D2 Second base portion 3E Side portion 3E1 First side portion 3E2 Second side 3E3 Third side 3E4 Fourth side 3K Opening 3P Projection 3R Recess 3R1 First recess 3T Projection 3T1 First projecting part 3T2 Second projecting part 3V U-shaped groove 3W Outer wall 3W1 First outer wall 3W2 Second outer wall 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 5G Supported side metal member 5G1 First supported side metal member 5G2 Second supported side metal member 5G3...Third supported side metal member 5G4...Fourth supported side metal member 5M...Lens side metal member 5M1...First lens side metal member 5M2...Second lens side metal member 5N...Supporting side metal member 5N1...First supporting side metal member 5N2...Second supporting side metal member 6...Leaf spring 6A...First leaf spring 6B...Second leaf spring 6F...Base side joint 6FA...First base side joint 6FB...Second base side joint 6G...Elastic arm 6GA...First elastic arm 6GB...Second elastic arm 6H1...First through hole 6H2...Second through hole 6M...Lens side joint 6MA...First lens side joint 6MB...Second lens side joint 7...Flexible metal member 7A...First flexible metal member 7B...Second flexible metal member 7F...Fixed joint 7FA...First fixed joint 7FB...Second fixed joint 7G...Elastic arm 7GA...First elastic arm 7GB...Second elastic arm 7M...Movable joint 7MA...First movable joint7MB...Second movable joint portion 8...Support member 8B...Base portion 8K...Opening 8P...Protrusion portion 8R...Recess portion 8R1...First recess portion 8R2...Second recess portion 8T...Contact portion 8T1...First contact portion 8T2...Second contact portion 8T3...Third contact portion 9...Receiving member 9A...First receiving member 9B...Second receiving member 11...Flexible wiring board 11R, 11R1, 11R2...One end portion 11S, 11S1, 11S2...Other end portion 11Y1...First flexible wiring board 11Y2...Second flexible wiring board 30...Buried member 30A...First buried member 30AP...First joint portion 30AT···First terminal part 30B···Second buried member 30BP···Second joint part 30BT···Second terminal part 30C···Third buried member 30CP···Third joint part 30CQ···Third exposed part 30CT···Third terminal part 30D···Fourth buried member 30DP···Fourth joint part 30DQ···Fourth exposed part 30DT···Fourth terminal part 30E···Fifth buried member 30EP···Fifth joint part 30ET···Fifth terminal part 30F···Sixth buried member 30FP···Sixth joint part 30FT···Sixth terminal part 30G···Seventh buried member 30GP···Seventh joint part 30GT···Seventh terminal part 30H···Eighth buried member 30HP···Eighth joint 30HT···Eighth terminal 30I···Ninth buried member 30IP···Ninth joint 30IT···Ninth terminal 30J···Tenth buried member 30JP···Tenth joint 30JQ···Tenth exposed portion 30JT···Tenth terminal 30K···Eleventh buried member 30KP···Eleventh joint 30KT···Eleventh terminal 30L···Twelfth buried member 30LP···Twelfth joint 30LT···Twelfth terminal 101···Lens drive device BM···Base side magnetic member BM1···First base side magnetic member BM2···Second base side magnetic member BP, BPF1 to BPF4, BPG1 to BPG4, BPM1, BPM2, BPN1, BPN2...Base part CM...Camera module DM...Drive part DM1...First drive part DM2...Second drive part FB...Fixed side member GD...Guiding part GD1...First guide part GD2...Second guide part GE...Guided partGE1... 1st guided part GE2... 2nd guided part GM... Guide mechanism GM1... 1st guide mechanism GM2... 2nd guide mechanism GP1, GP2... Spacing GW... Guided wall part GW1... 1st guided wall part GW2... 2nd guided wall part HS... Housing HT1, HT2... Spacing IS... Image sensor J1~J16...Holding part LGD...Lower guide part LGD1...First lower guide part LGD2...Second lower guide part LGD3...Third lower guide part LGE...Lower guided part LGE1...First lower guided part LGE2...Second lower guided part LGE3...Third lower guided part LGM...Lower guide mechanism LGM1...1st lower guide mechanism LGM2...Second lower guide mechanism LGM3...Third lower guide mechanism LM...Lens side magnetic member LM1...First lens side magnetic member LM2...Second lens side magnetic member LMF...Magnetic force LMF1...First magnetic force LMF2...Second magnetic force LS...Lens body MB...Movable side member MB...Movable side member MF...Magnetic force MF1...First magnetic force MF2...Second magnetic force MW...Mounting wall MW1...First mounting wall MW2...Second mounting wall OA...Optical axis PF...Pressing force PF1...First pressing force PF2...Second pressing force 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 SM···Support side magnetic member SMC···Notch SMC1···First notch SMC2···Second notch SMK···Opening SU···Substrate TH···Through hole TH1···First through hole TH2···Second through hole

Claims

1. A base member; a lens holding member having a cylindrical portion capable of holding a lens body; a lens driving device including a shape memory alloy wire provided between the base member and the lens holding member to move the lens holding member in the optical axis direction; the shape memory alloy wire has one end supported by the base member and the other end supported by the lens holding member disposed at different positions in the optical axis direction; the base member has a guide portion that guides movement of the lens holding member in the optical axis direction, the lens holding member has a guided portion that is guided by the guiding portion, A lens driving device characterized in that, when an electric current is passed through the shape memory alloy wire, a pressing force acts on the guiding portion and the guided portion, causing the guiding portion and the guided portion to press against each other due to the contraction of the shape memory alloy wire, and the guided portion slides along the guiding portion.

2. The base member is provided with a base-side magnetic member, The lens holding member is provided with a lens-side magnetic member, At least one of the base-side magnetic member and the lens-side magnetic member is made of a magnet, a magnetic force acting between the base-side magnetic member and the lens-side magnetic member to reduce the pressing force when a current flows through the shape memory alloy wire; The lens driving device according to claim 1 .

3. the base member has a base-side metal member to which one end of the shape memory alloy wire is fixed, the lens holding member has a lens-side metal member to which the other end of the shape memory alloy wire is fixed, the guiding portion and the guided portion are disposed at positions closer to the lens side metal member than to the base side metal member.

3. The lens driving device according to claim 2.

4. the lens-side metal member is formed of a metal plate having a plate-shaped base portion, the lens holding member has a mounting wall portion to which the lens side metal member is mounted, and a guided wall portion formed along a plane intersecting with a plane along the plate surface of the base portion of the lens side metal member, the guided portion is formed on an inner surface of the guided wall portion, and the lens-side magnetic member is fixed to an outer surface of the guided wall portion, the base member has an outer wall portion disposed outside the guided wall portion, and the base-side magnetic member is fixed to the outer wall portion; The base-side magnetic member is composed of a magnet.

4. The lens driving device according to claim 3.

5. a through-hole that penetrates in the optical axis direction and is surrounded by an annular pedestal that includes the mounting wall and the guided wall is formed on the outside of the cylindrical portion, the base member has a protrusion that is inserted into the through-hole, The protrusion is provided with the guide portion.

5. The lens driving device according to claim 4.

6. a pair of guide mechanisms each formed by a combination of the guiding portion and the guided portion is provided on either side of the optical axis, Each of the pair of guide mechanisms is provided so as to correspond to a plurality of the shape memory alloy wires.

6. The lens driving device according to claim 1.

7. The base member has a plate-shaped main body portion, the lens holding member is disposed on one surface side of the main body portion, and a support member is disposed on the other surface side of the main body portion, the main body portion of the base member is movable relative to the support member in a direction perpendicular to the optical axis direction, Another shape memory alloy wire is provided between the base member and the support member, which moves the base member in a direction perpendicular to the optical axis direction.

6. The lens driving device according to claim 2.

8. the main body of the base member is configured to be movable in a direction perpendicular to the optical axis direction relative to the support member by at least three lower guide mechanisms, the lower guide mechanism has a lower guiding portion provided on the support member and a lower guided portion provided on the base member, the support member has a support-side magnetic member, the base-side magnetic member is formed of a magnet, The base-side magnetic member and the support-side magnetic member are configured so that the lower guiding portion and the lower guided portion are pressed against each other by a magnetic force acting between the base-side magnetic member and the support-side magnetic member.

8. The lens driving device according to claim 7.

9. The lens driving device according to any one of claims 1 to 5, the lens body fixed to the lens holding member; an imaging element facing the lens body, Camera module.

Images