Lens drive device and camera module

Abstract

To provide a lens drive device with which it is possible to more properly attach a vibration damping material.SOLUTION: A lens drive device 101 comprises: a lens holding member 2 that has an inner circumferential part 12 capable of holding a lens body; a housing HS that includes a base member 18 arranged below the lens holding member 2; a leaf spring 6 that supports the lens holding member 2 so as to be movable in an optical axis direction; and a drive mechanism DM which includes at least a coil 3 held to an outer circumferential part 12j of the lens holding member 2 and a magnet set 5 facing the coil 3, and which moves the lens holding member 2 in the optical axis direction. The lens holding member 2 has a penetration part 2H between the inner circumferential part 12 and the outer circumferential part 12j that penetrates in the optical axis direction. The base member 18 has a projection part 18P which is inserted in the penetration part 2H. A vibration damping material DP is arranged between a wall part that constitutes the penetration part 2H and the projection part 18P.SELECTED DRAWING: Figure 13A

Description

[Technical field]

[0001] The present disclosure relates to a lens driving device mounted on, for example, a camera-equipped mobile device, and a camera module including the lens driving device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a lens driving device is known that includes a vibration damping material for suppressing vibration of a lens holding member driven by a voice coil motor constituted by a coil and a magnet (see Patent Document 1).

[0003] In this lens driving device, the vibration-damping material is disposed between the outer surface of the lens holding member and a wall portion that is a part of the base member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 261657 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned configuration, depending on the installation position or size of the magnet, for example, when magnets are arranged on the front, back, left and right sides of the lens holding member, or when the length of the magnet is longer than the length of the outer surface, it may not be possible to attach vibration-damping material between the lens holding member and the base member.

[0006] It is therefore desirable to provide a lens driving device in which a vibration-damping material can be attached more appropriately. [Means for solving the problem]

[0007] A lens driving device according to an embodiment of the present invention includes a housing including a lens holding member having an inner periphery capable of holding a lens body, a base member arranged opposite the lens holding member in the optical axis direction, a support member that supports the lens holding member movably in the optical axis direction, and a drive mechanism including at least a coil held on an outer periphery of the lens holding member and a magnet facing the coil, and moves the lens holding member in the optical axis direction, wherein the lens holding member has a through portion penetrating in the optical axis direction between the inner periphery and the outer periphery, the base member has a protrusion that is inserted into the through portion, and a vibration-damping material is arranged between a wall portion constituting the through portion and the protrusion, The housing is formed in a substantially rectangular shape when viewed from above along the optical axis direction, and the through-hole and the protrusion are provided at positions corresponding to corners of the housing. is. Effect of the Invention

[0008] The lens driving device described above is more appropriately equipped with a vibration-damping material. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an exploded perspective view of the lens driving device. [Figure 2A] FIG. 2 is a top perspective view of the lens driving device. [Figure 2B] FIG. 2 is a front view of the lens driving device. [Figure 3A] FIG. 2 is a top perspective view of the lens driving device from which a cover member and a spacer have been removed; [Figure 3B] 4 is a front view of the lens driving device with a cover member and a spacer removed. FIG. [Figure 4A] FIG. 2 is a top perspective view of the lens holding member. [Figure 4B] FIG. 2 is a top perspective view of a lens holding member around which a coil is wound. [Figure 5A] FIG. 4 is a bottom perspective view of the lens holding member. [Figure 5B] FIG. 2 is a bottom perspective view of a lens holding member around which a coil is wound. [Figure 6] FIG. 4 is an enlarged view of a portion of the lens holding member. [Figure 7A]4 is a bottom view of the lens driving device from which the metal member and the base member have been removed. FIG. [Figure 7B] 1 is a bottom view of the lens driving device from which the metal member, the base member, the lower leaf spring, and the lens holding member have been removed. FIG. [Figure 8A] FIG. [Figure 8B] FIG. 2 is a top view of the lower leaf spring. [Figure 9] FIG. [Figure 10] FIG. 2 is a top perspective view of the metal member, the lower leaf spring, and the coil. [Figure 11A] FIG. 4 is a top view of a base member in which a terminal member is embedded. [Figure 11B] FIG. 4 is a top view of a base member to which a wiring board is attached. [Figure 12] FIG. [Figure 13A] 1 is a top view of a lens holding member, a coil, a magnet set, a vibration damping material, and a base member. FIG. [Figure 13B] 4 is a cross-sectional view of a lens holding member, a coil, a vibration damping material, and a base member. FIG. [Figure 14A] FIG. 13 is a top perspective view of the protrusion without the vibration-damping material attached. [Figure 14B] FIG. 13 is a top perspective view of a protrusion with vibration-damping material attached thereto. [Figure 15] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A lens driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the lens driving device 101. FIG. 2A is an upper perspective view of the lens driving device 101, and FIG. 2B is a front view of the lens driving device 101 as viewed from the X1 side. FIG. 3A is an upper perspective view of the lens driving device 101 with the spacer 1 and the cover member 4 removed, and corresponds to FIG. 2A. FIG. 3B is a front view of the lens driving device 101 with the spacer 1 and the cover member 4 removed, and corresponds to FIG. 2B.

[0011] In FIG. 1, X1 represents one direction of the X axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. In this embodiment, the optical axis OA extends parallel to the Z axis. The X1 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (rear side) of the lens driving device 101. 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. Moreover, the Z1 side of the lens driving device 101 corresponds to the upper side of the lens driving device 101, and the Z2 side of the lens driving device 101 corresponds to the lower side of the lens driving device 101. The same applies to the other figures.

[0012] As shown in FIG. 1, the lens driving device 101 includes a lens holding member 2 capable of holding a lens body (not shown), a driving mechanism DM that moves the lens holding member 2 along the optical axis direction (Z-axis direction), a leaf spring 6 as a support member that supports the lens holding member 2 so that it can move in the optical axis direction, and a fixed side member FB to which the leaf spring 6 is fixed.

[0013] The lens body is, for example, a cylindrical lens barrel equipped with at least one lens, and is configured so that its central axis is along the optical axis direction. A detection magnet 8 and a balance magnet 9 are attached to the lens holding member 2. The optical axis direction includes the direction of the optical axis OA with respect to the lens body and a direction parallel to the optical axis OA.

[0014] 1, the drive mechanism DM includes a coil 3 wound in a circular shape, and a magnet set 5 arranged opposite the coil 3. The fixed side member FB includes a spacer 1, a rectangular box-shaped bottomless cover member 4, and a base member 18 in which a metal member 7 is embedded. A wiring board 10 is attached to the base member 18. A magnetic detection member 11 and a capacitor 14 are attached to the wiring board 10.

[0015] 2A, the cover member 4 is joined to the base member 18 to form a housing HS together with the base member 18. The cover member 4 has a rectangular cylindrical outer peripheral wall portion 4A and a rectangular annular flat top plate portion 4B provided so as to be continuous with the upper end (the end on the Z1 side) of the outer peripheral wall portion 4A.

[0016] The outer peripheral wall portion 4A has four side plate portions formed in a flat plate shape. In this embodiment, as shown in FIG. 2A, the side plate portions have a first side plate portion 4A1 and a third side plate portion 4A3 that face each other, and a second side plate portion 4A2 and a fourth side plate portion 4A4 that are perpendicular to the first side plate portion 4A1 and the third side plate portion 4A3 and face each other. The first side plate portion 4A1 and the third side plate portion 4A3 are perpendicular to the second side plate portion 4A2 and the fourth side plate portion 4A4. A substantially circular opening 4K is formed in the center of the top plate portion 4B.

[0017] The spacer 1 is disposed so as to prevent the lens holding member 2 from colliding with the cover member 4 when the lens holding member 2 moves in the Z1 direction. That is, the spacer 1 is disposed so as to form a space between the lens holding member 2 and the top plate portion 4B of the cover member 4. However, if a space can be formed between the lens holding member 2 and the top plate portion 4B of the cover member 4 by a different structure or the like, the spacer 1 may be omitted.

[0018] 1, the leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the spacer 1, and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a right lower leaf spring 26R and a left lower leaf spring 26L.

[0019] The metal member 7 embedded in the base member 18 includes a first metal member 7A to a sixth metal member 7F that provide electrical connection with the outside.

[0020] The detection magnet 8 is a permanent magnet attached to the lens holding member 2 in order to detect the position of the lens holding member 2. The balance magnet 9 is a permanent magnet attached to the lens holding member 2 in order to offset the effect that the weight of the detection magnet 8 has on the lens holding member 2, and has the same weight as the detection magnet 8. In this embodiment, both the detection magnet 8 and the balance magnet 9 are fixed to the lens holding member 2 with an adhesive.

[0021] The magnetic detection member 11 includes a magnetic sensor that detects the magnetic field generated by the detection magnet 8, and a driver IC with a built-in current control circuit that controls the current flowing through the coil 3. The magnetic sensor is, for example, a Hall element. The magnetic sensor may also be a magnetoresistance effect element. In this embodiment, the magnetic detection member 11 is configured by electronic components in which at least the Hall element and a chip constituting the driver IC are housed in one package.

[0022] The capacitor 14 is a bypass capacitor connected between the power supply voltage (VDD) and the ground voltage (VSS).

[0023] The lens driving device 101 has a substantially rectangular parallelepiped shape and is attached on a substrate (not shown) on which an imaging element (not shown) is mounted. The lens driving device 101, a lens body attached to a lens holding member 2, the imaging element mounted on the substrate so as to face the lens body, and the substrate constitute a camera module.

[0024] The coil 3 is connected to the magnetic detection member 11 via the lower leaf spring 26, the metal member 7, and the wiring board 10. When a current flows from a current control circuit (driver IC) provided in the magnetic detection member 11 to the coil 3, the drive mechanism DM generates an electromagnetic force along the optical axis direction.

[0025] The lens driving device 101 utilizes this electromagnetic force to move the lens holding member 2 along the optical axis direction on the Z1 side (subject side) of the image sensor, thereby realizing an automatic focus adjustment function. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image sensor to enable macro photography, and moves the lens holding member 2 in a direction approaching the image sensor to enable infinity photography.

[0026] Next, the lens holding member 2 and the driving mechanism DM will be described. Fig. 4A is an upper perspective view of the lens holding member 2, and Fig. 4B is an upper perspective view of the lens holding member 2 with the coil 3 wound around it. Fig. 5A is a lower perspective view of the lens holding member 2, and Fig. 5B is a lower perspective view of the lens holding member 2 with the coil 3 wound around it. Fig. 6 is an enlarged view of the range R1 surrounded by the dashed line shown in Fig. 5B when the range R1 is viewed from the Y2 side. Fig. 7A is a bottom view of the lens driving device 101 with the metal member 7 and the base member 18 removed, and Fig. 7B is a bottom view of the lens driving device 101 with the lower leaf spring 26 and the lens holding member 2 further removed.

[0027] In this embodiment, the lens holding member 2 is produced by injection molding a synthetic resin such as liquid crystal polymer (LCP). Specifically, as shown in Fig. 4A, the lens holding member 2 includes an inner circumferential portion 12 that forms a through hole along the optical axis direction, and a flange portion (brim-shaped portion) 52 as a first protruding portion formed on the imaging element side (Z2 side) in the optical axis direction. In this embodiment, the flange portion 52 is formed so as to protrude radially outward from a circle centered on the optical axis OA in a top view, that is, so as to protrude in a direction perpendicular to the optical axis direction.

[0028] In this embodiment, the inner surface of the inner circumferential portion 12 is configured so that the lens body is attached to it by adhesive. However, the inner surface of the inner circumferential portion 12 may be formed with a screw groove for attaching the lens body, or with an uneven portion for increasing the adhesive strength between the inner circumferential portion 12 and the lens body. The lens holding member 2 is provided with four pedestal portions 12d on the end surface on the subject side. Each of the four pedestal portions 12d has a recess 12dh formed on the upper surface thereof for accommodating an adhesive. As shown in FIG. 3A, the inner portion 16i of the upper leaf spring 16 is placed on the pedestal portion 12d and fixed thereto by adhesive.

[0029] 4A, an outer peripheral portion 12j is provided on the outer peripheral surface of the lens holding member 2 as an outer wall portion that supports the coil 3 from the inside. In this embodiment, the outer peripheral portion 12j has an octagonal contour in top view so as to support the coil 3 having an octagonal annular outer shape in top view.

[0030] On the subject side of the outer circumferential portion 12j, four eaves portions 12h are formed as second protruding portions protruding radially outward so as to face the flange portion 52 as the first protruding portion in the optical axis direction. In this embodiment, the eaves portions 12h are formed so as to protrude outward toward the side plate portion of the cover member 4, that is, so as to protrude in a direction perpendicular to the optical axis direction. As shown in FIG. 4B, the coil 3 is supported by the outer circumferential portion 12j and is wound in an annular shape on the outer circumferential surface side of the lens holding member 2 so as to be sandwiched between the eaves portions 12h and the flange portion 52 in the optical axis direction. The base portion 12d is disposed on the upper portion of the eaves portions 12h.

[0031] The flange portion 52 protrudes radially outward from the outer circumferential surface of the lens holding member 2 at the imaging element side (Z2 side). The coil 3 is disposed on the subject side of the flange portion 52. As shown in Fig. 5B, the flange portion 52 has two notches 52k formed on either side of the optical axis OA of the lens body. The right extension portion 33R, which is the winding start portion of the wire material constituting the coil 3, passes through one of the two notches 52k, and the left extension portion 33L, which is the winding end portion of the wire material constituting the coil 3, passes through the other of the two notches 52k.

[0032] As shown in Fig. 5A, the flange portion 52 includes two rectangular convex holding portions 72 and four round convex protrusions 2t that protrude downward (in the Z2 direction) from the surface on the imaging element side (Z2 side). As shown in Fig. 5B, the holding portions 72 include a left holding portion 72L that corresponds to the winding end side of the coil 3 (winding portion 13) and a right holding portion 72R that corresponds to the winding start side of the coil 3 (winding portion 13). Both ends of the coil 3 are wound around and held by the holding portions 72.

[0033] As shown in Figs. 5A and 7A, the protrusions 2t include two protrusions 2t corresponding to the right lower leaf spring 26R and two protrusions 2t corresponding to the left lower leaf spring 26L. The inner parts 26i of the right lower leaf spring 26R and the left lower leaf spring 26L are attached and fixed to the protrusions 2t. The fixing of the inner parts 26i of the right lower leaf spring 26R and the left lower leaf spring 26L is realized by hot crimping the protrusions 2t inserted into the through holes 26t (see Fig. 8B) formed in the inner parts 26i. The hot crimping may be cold crimping. In Figs. 5A and 5B, the protrusions 2t are shown in a state in which the tips are deformed after hot crimping. The same applies to the other figures.

[0034] Next, the driving mechanism DM of the lens driving device 101 will be described. As shown in FIG. 7B, the driving mechanism DM includes a coil 3 and a magnet set 5 fixed to each of the four side plate parts (first side plate part 4A1 to fourth side plate part 4A4) constituting the cover member 4. Specifically, the magnet set 5 includes a first magnet 5A to a fourth magnet 5D as driving magnets. The first magnet 5A is arranged to face the first side plate part 4A1, the second magnet 5B is arranged to face the second side plate part 4A2, the third magnet 5C is arranged to face the third side plate part 4A3, and the fourth magnet 5D is arranged to face the fourth side plate part 4A4. The driving mechanism DM generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet set 5, and can move the lens holding member 2 up and down along the optical axis direction.

[0035] As shown in Fig. 5B, the coil 3 is formed by winding a conductive wire around the outer periphery 12j of the lens holding member 2. The coil 3 includes a winding portion 13 formed by winding in an annular shape, and an extension portion 33 extending from the winding portion 13 and wound around the holding portion 72. For clarity, Fig. 5B omits illustration of the detailed winding state of the conductive wire, the surface of which is covered with an insulating member, for the winding portion 13. The same applies to other figures illustrating the winding portion 13.

[0036] The extension portion 33 includes a right extension portion 33R connected to an end portion (winding start portion) of the winding portion 13 located on the inner side of the winding portion 13 at the winding start side of the coil 3, and a left extension portion 33L connected to an end portion (winding end portion) of the winding portion 13 located on the outer side of the winding portion 13 at the winding end side of the coil 3.

[0037] 6, the right extending portion 33R includes a winding portion 33m wound around the right holding portion 72R, a connecting portion 33c extending opposite to the inner bottom surface of the housing portion 82s, and an insertion portion 33k inserted into the notch portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side). The housing portion 82s is configured to be able to contain a conductive adhesive that connects the right extending portion 33R of the coil 3 and the right lower leaf spring 26R. The same applies to the left extending portion 33L.

[0038] In this embodiment, the right extension portion 33R is wound around the right holding portion 72R of the lens holding member 2 before the wire material constituting the coil 3 is wound around the outer periphery of the lens holding member 2, i.e., before the winding portion 13 is formed. In the example shown in FIG. 6, a part of the wire material constituting the coil 3 is wound around the right holding portion 72R by three turns. As a result, the winding portion 33m is formed in the right holding portion 72R, and a part of the right extension portion 33R is held by the right holding portion 72R. However, the right extension portion 33R may be wound around the right holding portion 72R after the wire material constituting the coil 3 is wound around the outer periphery of the lens holding member 2.

[0039] After the right extending portion 33R is wound around the right holding portion 72R, a wire is wound around the outer circumferential portion 12j of the lens holding member 2. At this time, as shown in Fig. 6, the wire extending from the winding portion 33m extends opposite the inner bottom surface of the storage portion 82s. Then, the wire extends from the lower side of the flange portion 52 through the notch portion 52k to the upper side of the flange portion 52. At this time, the portion facing the inner bottom surface of the storage portion 82s constitutes the connection portion 33c of the right extending portion 33R, and the portion passing through the notch portion 52k constitutes the insertion portion 33k of the right extending portion 33R.

[0040] As shown in Fig. 4B, the winding portion 13 of the coil 3 wound around the outer periphery 12j of the lens holding member 2 is disposed at a position surrounding the periphery of the lens holding member 2. The winding portion 13 is disposed on the subject side of the flange portion 52 so as to be sandwiched between the visor portion 12h and the flange portion 52 while being supported from inside by the outer periphery 12j (see Fig. 4A). The winding portion 13 is fixed to the lens holding member 2 with an adhesive.

[0041] When winding of the wire around the outer circumferential portion 12j of the lens holding member 2 is completed, the left extending portion 33L connected to the end of the winding portion 13 on the winding end side is drawn out from the subject side of the flange portion 52 to the imaging element side of the flange portion 52 through the notch portion 52k. Specifically, the insertion portion 33k passes through the notch portion 52k, the connection portion 33c extends facing the inner bottom surface of the storage portion 82s, and the winding portion 33m is wound around the left holding portion 72L of the lens holding member 2. The left extending portion 33L is wound around the left holding portion 72L by three turns.

[0042] As shown in Fig. 5B, the detection magnet 8 and the balancing magnet 9 are disposed on the lower side (Z2 side) of the lens holding member 2. In Fig. 5B, for clarity, a cross pattern is provided on the detection magnet 8 and the balancing magnet 9. Specifically, the detection magnet 8 is fitted into a recess 2v1 formed in a front edge portion located on the front side (X1 side) of the four sides of the lens holding member 2. The balancing magnet 9 is fitted into a recess 2v2 formed in a rear edge portion located on the rear side (X2 side) of the four sides of the lens holding member 2.

[0043] Next, the cover member 4 will be described. In this embodiment, the cover member 4 is made of a magnetic metal such as iron and configured to function as a yoke. As shown in Fig. 7B, the cover member 4 houses the coil 3 and the magnet set 5 in the storage section 4S, and as shown in Fig. 2A, the cover member 4 is connected to the base member 18 to form a housing HS together with the base member 18.

[0044] However, the cover member 4 may be produced by punching and drawing a plate material made of a non-magnetic metal such as austenitic stainless steel. In this case, even if another lens driving device is disposed adjacent to the lens driving device 101 in a dual camera type mobile device or the like, the cover member 4 does not have an adverse magnetic effect on a driving mechanism included in the other lens driving device.

[0045] Next, the magnet set 5 constituting the drive mechanism DM will be described. Each of the first magnet 5A to the fourth magnet 5D constituting the magnet set 5 has a substantially rectangular parallelepiped shape as shown in FIG. 1, and is arranged so as to extend in a direction perpendicular to the optical axis direction (X-axis direction or Y-axis direction). As shown in FIG. 7B, the first magnet 5A to the fourth magnet 5D are located outside the coil 3 and arranged so as to follow the side plate portion of the outer peripheral wall portion 4A constituting the cover member 4. The first magnet 5A to the fourth magnet 5D are fixed to the inner surface of the side plate portion of the outer peripheral wall portion 4A by an adhesive. Each of the first magnet 5A to the fourth magnet 5D is arranged so that, for example, the inner side is the N pole and the outer side is the S pole.

[0046] Next, the leaf spring 6 and the fixed-side member FB will be described with reference to Figs. 8A, 8B, and 9. Fig. 8A is a top view of the upper leaf spring 16, and Fig. 8B is a top view of the lower leaf spring 26. Fig. 9 is a diagram showing a configuration example of the base member 18 as the fixed-side member FB. Specifically, Fig. 9(A) is an upper perspective view of the base member 18 in which the metal member 7 is not embedded, and Fig. 9(B) is an upper perspective view of the metal member 7 embedded in the base member 18. Fig. 9(C) is an upper perspective view of the base member 18 in which the metal member 7 is embedded, and Fig. 9(D) is an upper perspective view of the base member 18 to which the lower leaf spring 26 is assembled.

[0047] The leaf spring 6 is made of a metal plate mainly made of a copper alloy. As shown in FIG. 1, the leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the spacer 1, and a lower leaf spring 26 arranged between the lens holding member 2 and the base member 18. When the lens holding member 2 and the leaf spring 6 (upper leaf spring 16, lower right leaf spring 26R, and lower left leaf spring 26L) are combined, the leaf spring 6 supports the lens holding member 2 so that the lens holding member 2 can move in the optical axis direction (Z-axis direction). The lower leaf spring 26 also functions as a power supply member for supplying current to the coil 3. Therefore, the lower right leaf spring 26R is electrically and mechanically connected to one end of the coil 3, and the lower left leaf spring 26L is electrically and mechanically connected to the other end of the coil 3.

[0048] As shown in Fig. 8A, the upper leaf spring 16 has a substantially rectangular annular shape in top view, and includes four inner parts 16i as first support parts (movable support parts) fixed to the lens holding member 2, an outer part 16e as second support parts (fixed support parts) fixed to the fixed member FB, and four elastic arm parts 16g located between the inner parts 16i and the outer part 16e. Specifically, the outer part 16e having a substantially rectangular annular shape in top view has four corner parts 16b and four crosspiece parts 16f connecting the four corner parts 16b. The crosspiece parts 16f are sandwiched between the spacer 1 and the magnet set 5 (first magnet 5A to fourth magnet 5D) and fixed with an adhesive. The spacer 1, the cover member 4, and the magnet set 5 function as the fixed member FB.

[0049] When the upper leaf spring 16 is assembled into the lens driving device 101, as shown in Fig. 3A, the inner portion 16i is placed on the base portion 12d (see Fig. 4A) of the lens holding member 2. The inner portion 16i is fixed to the lens holding member 2 by an adhesive applied to a recess 12dh formed in the base portion 12d. As shown in Figs. 3A and 3B, the outer portion 16e contacts the upper surfaces (surfaces on the Z1 side) of the first magnet 5A to the fourth magnet 5D, and is sandwiched and fixed between the spacer 1 (not shown in Figs. 3A and 3B) and each of the first magnet 5A to the fourth magnet 5D.

[0050] 8A, the upper leaf spring 16 is formed to have four-fold rotational symmetry with respect to the optical axis OA. The upper leaf spring 16 is fixed to the lens holding member 2 at the inner portion 16i, and is fixed to the cover member 4 via the spacer 1 at the outer portion 16e. Therefore, the upper leaf spring 16 can support the lens holding member 2 in a well-balanced manner.

[0051] The lower right leaf spring 26R and the lower left leaf spring 26L are formed and arranged to have two-fold rotational symmetry with respect to the optical axis OA, as shown in Fig. 8B. Each of the lower right leaf spring 26R and the lower left leaf spring 26L includes an inner portion 26i serving as a first support portion (movable-side support portion) fixed to the lens holding member 2, an outer portion 26e serving as a second support portion (fixed-side support portion) fixed to the fixed-side member FB, and two elastic arms 26g located between the inner portion 26i and the outer portion 26e.

[0052] The two elastic arms 26g of the lower right leaf spring 26R are a first elastic arm 26g1 and a second elastic arm 26g2, and the two elastic arms 26g of the lower left leaf spring 26L are a third elastic arm 26g3 and a fourth elastic arm 26g4.

[0053] As shown in Fig. 8B, each of the inner portions 26i of the lower-right leaf spring 26R and the lower-left leaf spring 26L includes two inner joint portions 26c joined to the protruding portion 2t (see Fig. 5A) of the lens holding member 2, a connecting portion 26p connecting the two inner joint portions 26c, and a coil connection portion 26h facing the extension portion 33 of the coil 3. Specifically, the lower-right leaf spring 26R has a right coil connection portion 26hR, and the lower-left leaf spring 26L has a left coil connection portion 26hL.

[0054] When the lower-right leaf spring 26R and the lower-left leaf spring 26L are assembled into the lens driving device 101, the four protrusions 2t of the lens holding member 2 shown in Fig. 5A are inserted into the circular through-holes 26t provided in the inner joint portions 26c of the lower-right leaf spring 26R and the lower-left leaf spring 26L shown in Fig. 8B. The inner joint portions 26c are then fixed to the lens holding member 2 as shown in Fig. 7A, for example, by hot crimping or cold crimping the protrusions 2t. As a result, the inner portions 26i of the lower-right leaf spring 26R and the lower-left leaf spring 26L are positioned and fixed to the lens holding member 2.

[0055] As shown in FIG. 8B, the outer portion 26e of the right lower leaf spring 26R includes two fixing portions 26d joined to the base member 18 and a crosspiece 26f connecting the two fixing portions 26d. The two fixing portions 26d are a first fixing portion 26d1 and a second fixing portion 26d2. Similarly, as shown in FIG. 8B, the outer portion 26e of the left lower leaf spring 26L includes two fixing portions 26d joined to the base member 18. The two fixing portions 26d are a third fixing portion 26d3 and a fourth fixing portion 26d4. Through holes 26s provided in the fixing portions 26d of the right lower leaf spring 26R and the left lower leaf spring 26L respectively receive protruding portions 18t (see FIG. 9(A)) provided on the upper surface of the base member 18. The protruding portions 18t are fixed to the fixing portions 26d by hot crimping or cold crimping. As a result, the outer portions 26e of the lower right leaf spring 26R and the lower left leaf spring 26L are positioned and fixed to the base member 18 as shown in FIG. 9(D).

[0056] In this way, the lower-right leaf spring 26R is joined to the lens holding member 2 via the two inner joining portions 26c, and is joined to the base member 18 via the two fixing portions 26d. The same is true for the lower-left leaf spring 26L. With this configuration, the lower-right leaf spring 26R and the lower-left leaf spring 26L can support the lens holding member 2 in a well-balanced manner while allowing it to move in the optical axis direction.

[0057] Next, a description will be given of an example of a connection structure between the lower right leaf spring 26R and the coil 3. The description regarding the lower right leaf spring 26R also applies to the lower left leaf spring 26L.

[0058] The right coil connection portion 26hR of the inner portion 26i of the right lower leaf spring 26R is configured to face the right accommodation portion 82s (see FIG. 6) of the lens holding member 2 when the lens driving device 101 is assembled. That is, the subject-side (Z1 side) surface of the right coil connection portion 26hR faces the concave accommodation portion 82s. The connection portion 33c of the right extension portion 33R of the coil 3 extends between the subject-side (Z1 side) surface of the inner portion 26i (right coil connection portion 26hR) of the right lower leaf spring 26R and the imaging element side (Z2 side) surface of the lens holding member 2.

[0059] The right accommodation portion 82s of the lens holding member 2 is configured to accommodate a conductive adhesive that connects the right extension portion 33R of the coil 3 and the right lower leaf spring 26R. When the right lower leaf spring 26R is assembled to the lens holding member 2, the right holding portion 72R protrudes downward (in the Z2 direction) from the inner portion 26i of the right lower leaf spring 26R so that its tip (the end on the Z2 side) is located closer to the imaging element side (Z2 side) than the inner portion 26i of the right lower leaf spring 26R. In addition, the winding portion 33m is also wound around the right holding portion 72R so that a part of it is located closer to the imaging element side (Z2 side) of the inner portion 26i.

[0060] The right lower leaf spring 26R and the right extension part 33R of the coil 3 are electrically and physically connected with a conductive adhesive in which conductive filler such as silver particles is dispersed in synthetic resin. Specifically, before the right lower leaf spring 26R is attached to the lens holding member 2, the conductive adhesive is applied to the inside of the housing part 82s, and then the right lower leaf spring 26R is attached to the lens holding member 2. Then, the protruding part 2t of the lens holding member 2 is thermally crimped, and the conductive adhesive is thermally cured. From the step of applying the conductive adhesive to the housing part 82s to the step of thermally curing the conductive adhesive, the lens holding member 2 is typically placed upside down so that the right holding part 72R protrudes vertically upward. Therefore, even if the conductive adhesive has fluidity, it is appropriately held at the desired position (position in the housing part 82s). And, since a part of the connection part 33c is placed in the housing part 82s, it is embedded in the conductive adhesive. The conductive adhesive is not limited to a heat-curing type, but may be an ultraviolet-curing type or a moisture-curing type.

[0061] Also, the right lower leaf spring 26R and the right extension portion 33R of the coil 3 may be electrically and physically connected by soldering instead of the conductive adhesive. In this case, the solder may be disposed on the Z2 side of the right lower leaf spring 26R to electrically and physically connect the right lower leaf spring 26R and the right extension portion 33R.

[0062] Next, the fixed member FB will be described. The fixed member FB includes a spacer 1, a cover member 4, a magnet set 5, and a base member .

[0063] The base member 18 is produced by injection molding using a synthetic resin such as a liquid crystal polymer. In this embodiment, the base member 18 is a member having a substantially rectangular outer shape in a top view as shown in FIG. 9A, and a circular opening 18k is formed in the center. In addition, six round convex protrusions 18t (first protrusion 18t1 to sixth protrusion 18t6) protruding upward are provided on the surface (upper surface) of the base member 18 on the subject side (Z1 side). The protrusions 18t are inserted into through holes 26s (see FIG. 8B) provided in the fixing parts 26d of the lower right leaf spring 26R and the lower left leaf spring 26L. At this time, the protrusions 18t are fixed to the fixing parts 26d by heat crimping. In FIG. 9A, FIG. 9C, and FIG. 9D, the protrusions 18t are shown in a state in which the tips are deformed after being heat crimped. The same applies to other figures showing the protruding portion 18t. The protruding portion 18t may be fixed to the fixing portion 26d by cold caulking.

[0064] 9(A), the base member 18 is configured to have four sides 18s (first side 18s1 to fourth side 18s4) arranged to surround the opening 18k. Specifically, the first side 18s1 and the third side 18s3 are configured to extend substantially parallel to the Y-axis, and the second side 18s2 and the fourth side 18s4 are configured to extend substantially parallel to the X-axis. That is, the extending directions of the first side 18s1 and the third side 18s3 are configured to intersect with the extending directions of the second side 18s2 and the fourth side 18s4.

[0065] 9(B), metal members 7 made of metal plates containing materials such as copper or iron or alloys containing them as main components are embedded by insert molding in the base member 18. The metal members 7 include a first metal member 7A to a sixth metal member 7F and an eleventh metal member 7X to a thirteenth metal member 7Z that are electrically insulated from one another.

[0066] As shown in FIG. 9(C), the first metal member 7A is configured so that a portion of the first metal member 7A is exposed on the upper surface (Z1 side surface) of the base member 18 as a leaf spring connection portion 7AP. Similarly, as shown in FIG. 9(C), the second metal member 7B is configured so that a portion of the first metal member 7A is exposed on the upper surface (Z1 side surface) of the base member 18 as a leaf spring connection portion 7BP. As shown in FIG. 9(C) and FIG. 9(D), the first metal member 7A is electrically and mechanically connected to the right lower leaf spring 26R by welding at the leaf spring connection portion 7AP. Similarly, the second metal member 7B is electrically and mechanically connected to the left lower leaf spring 26L by welding at the leaf spring connection portion 7BP. The welding is realized by, for example, laser welding.

[0067] Fig. 9(D) shows a state where the leaf spring connection portion 7AP and the first fixed portion 26d1 are joined by the weld metal WM1 at the through hole 26v formed in the first fixed portion 26d1. Similarly, Fig. 9(D) shows a state where the leaf spring connection portion 7BP and the third fixed portion 26d3 are joined by the weld metal WM2 at the through hole 26v formed in the third fixed portion 26d3.

[0068] Furthermore, the right lower leaf spring 26R is electrically and mechanically connected to the right extension portion 33R (see FIG. 10) of the coil 3 at the right coil connection portion 26hR, and the left lower leaf spring 26L is electrically and mechanically connected to the left extension portion 33L (see FIG. 10) of the coil 3 at the left coil connection portion 26hL. Therefore, the coil 3 can receive a current supply via the metal member 7 and the lower leaf spring 26.

[0069] The first metal member 7A is electrically and mechanically connected to a board (not shown) on which an imaging element is mounted via a terminal portion 7AT extending downward (Z2 direction) from an end portion on the front side (X1 side) of the base member 18. Similarly, the second metal member 7B is electrically and mechanically connected to a board (not shown) on which an imaging element is mounted via a terminal portion 7BT extending downward (Z2 direction) from an end portion on the front side (X1 side) of the base member 18.

[0070] In addition, the first metal member 7A has a connection portion 7AS that contacts a first joint portion TM1, which is one of six joint portions TM (see FIG. 11B) formed on the wiring board 10, and the second metal member 7B has a connection portion 7BS that contacts a second joint portion TM2, which is one of six joint portions TM (see FIG. 11B) formed on the wiring board 10.

[0071] The third metal member 7C has a terminal portion 7CT that protrudes downward (in the Z2 direction) from the base member 18 on the front side (X1 side) of the base member 18, and a connection portion 7CS that contacts the third joint portion TM3, which is one of six joint portions TM (see FIG. 11B) formed on the wiring board 10.

[0072] The fourth metal member 7D has a terminal portion 7DT that protrudes downward (in the Z2 direction) from the base member 18 on the front side (X1 side) of the base member 18, and a connection portion 7DS that contacts the fourth joint portion TM4, which is one of six joint portions TM (see FIG. 11B) formed on the wiring board 10.

[0073] The fifth metal member 7E has a terminal portion 7ET that protrudes downward (in the Z2 direction) from the base member 18 on the front side (X1 side) of the base member 18, and a connection portion 7ES that contacts a fifth joint TM5, which is one of six joints TM (see Figure 11B) formed on the wiring board 10.

[0074] The sixth metal member 7F has a terminal portion 7FT that protrudes downward (in the Z2 direction) from the base member 18 on the front side (X1 side) of the base member 18, and a connection portion 7FS that contacts the sixth joint portion TM6, which is one of six joint portions TM (see FIG. 11B) formed on the wiring board 10.

[0075] The eleventh metal member 7X has a left rear end 7XPL and a right rear end 7XPR that protrude outward from the corners of the base member 18 in a direction perpendicular to the optical axis direction.

[0076] The twelfth metal member 7Y has a left front end 7YPL that protrudes outward from a corner of the base member 18 in a direction perpendicular to the optical axis direction.

[0077] The thirteenth metal member 7Z has a right front end 7ZPR that protrudes outward from a corner of the base member 18 in a direction perpendicular to the optical axis direction.

[0078] 2A, the inner surface of the lower end portion of the outer peripheral wall portion 4A of the cover member 4 and the outer peripheral side surface of the base member 18 are combined and positioned, and then the base member 18 is fixed to the cover member 4 by an adhesive. At this time, the lower ends of the four corners of the outer peripheral wall portion 4A of the cover member 4 and the left rear end portion 7XPL, the right rear end portion 7XPR, the left front end portion 7YPL, and the right front end portion 7ZPR are welded by laser welding or the like, or are adhesively fixed by a conductive adhesive.

[0079] Next, the current supplied to the coil 3 will be described with reference to Fig. 10. Fig. 10 is an upper perspective view of the metal member 7, the lower leaf spring 26, and the coil 3. Fig. 10 shows a state where a current flows from the terminal portion 7AT of the first metal member 7A toward the right extension portion 33R of the coil 3, and a current flows from the left extension portion 33L of the coil 3 toward the terminal portion 7BT of the second metal member 7B. Note that the following description also applies to a case where a current flows from the terminal portion 7BT of the second metal member 7B toward the left extension portion 33L of the coil 3, and a current flows from the right extension portion 33R of the coil 3 toward the terminal portion 7AT of the first metal member 7A. In addition, the following explanation also applies when current flows from the first joint TM1 of the wiring board 10 through the connection portion 7AS of the first metal member 7A to the right extension portion 33R of the coil 3, and when current flows from the left extension portion 33L of the coil 3 through the connection portion 7BS of the second metal member 7B to the second joint TM2 of the wiring board 10, or when current flows in the opposite direction.

[0080] The first fixing portion 26d1 of the lower right leaf spring 26R is joined to the leaf spring connection portion 7AP of the first metal member 7A by welding at the through hole 26v. The dashed line DL1 indicates that the first fixing portion 26d1 and the leaf spring connection portion 7AP are joined. Similarly, the third fixing portion 26d3 of the lower left leaf spring 26L is joined to the leaf spring connection portion 7BP of the second metal member 7B by welding at the through hole 26v. The dashed line DL2 indicates that the third fixing portion 26d3 and the leaf spring connection portion 7BP are joined. Note that the second fixing portion 26d2 of the lower right leaf spring 26R and the fourth fixing portion 26d4 of the lower left leaf spring 26L are only connected to the base member 18 and are not joined to the metal member 7.

[0081] The right extension 33R of the coil 3 is connected to the right coil connection 26hR of the right lower leaf spring 26R by a conductive adhesive. The dashed line DL3 indicates that the right extension 33R and the right coil connection 26hR are connected. Similarly, the left extension 33L of the coil 3 is connected to the left coil connection 26hL of the left lower leaf spring 26L by a conductive adhesive. The dashed line DL4 indicates that the left extension 33L and the left coil connection 26hL are connected.

[0082] The current flowing from the terminal portion 7AT of the first metal member 7A toward the right extension portion 33R of the coil 3 passes through two conductive paths CP (a first conductive path CP1 and a second conductive path CP2) that connect the leaf spring connection portion 7AP and the right coil connection portion 26hR in parallel. The first conductive path CP1 is a conductive path that passes through the terminal portion 7AT, the leaf spring connection portion 7AP, the first fixed portion 26d1, the first elastic arm portion 26g1, and the right coil connection portion 26hR of the inner portion 16i, as indicated by a solid arrow, to the right extension portion 33R. The second conductive path CP2 is a conductive path that passes through the terminal portion 7AT, the leaf spring connection portion 7AP, the first fixed portion 26d1, the crosspiece portion 26f, the second fixed portion 26d2, the second elastic arm portion 26g2, and the right coil connection portion 26hR of the inner portion 16i, as indicated by a dashed arrow, to the right extension portion 33R.

[0083] The current flowing from the left extension portion 33L of the coil 3 to the terminal portion 7BT of the second metal member 7B passes through two conductive paths CP (a third conductive path CP3 and a fourth conductive path CP4) that connect in parallel between the leaf spring connection portion 7BP and the left coil connection portion 26hL. The third conductive path CP3 is a conductive path that passes through the left extension portion 33L, the left coil connection portion 26hL of the inner portion 16i, the third elastic arm portion 26g3, the third fixed portion 26d3, and the leaf spring connection portion 7BP to the terminal portion 7BT, as indicated by the dashed-dotted arrow. The fourth conductive path CP4 is a conductive path that passes through the left extension portion 33L, the left coil connection portion 26hL of the inner portion 16i, the fourth elastic arm portion 26g4, the fourth fixed portion 26d4, the bridge portion 26f, the third fixed portion 26d3, and the leaf spring connection portion 7BP to the terminal portion 7BT, as indicated by the dashed-dotted arrow.

[0084] Next, details of the wiring board 10 will be described with reference to Figures 11A, 11B, and 12. Figure 11A shows a top view of a base member 18 in which a metal member 7 is embedded, and Figure 11B shows a top view of the base member 18 to which the wiring board 10 is attached. Figure 11A corresponds to a diagram in which the wiring board 10 in Figure 11B is omitted. Figure 12 shows a bottom view of the wiring board 10.

[0085] The wiring board 10 is a printed circuit board having a conductive wiring pattern formed on an upper surface (surface on the Z1 side) and a lower surface (surface on the Z2 side). In this embodiment, the wiring board 10 is configured as a flexible wiring board, but may be a rigid wiring board or a rigid-flexible wiring board.

[0086] 11A and 11B, the wiring board 10 is attached to the upper surface of the base member 18 so that each of the six connection portions 7AS-7FS of the metal member 7 is electrically connected to the magnetic detection member 11. In this embodiment, the wiring pattern (first joint portion TM1 to sixth joint portion TM6) of the wiring board 10 and the connection portions 7AS-7FS of the metal member 7 are joined by solder as a joining material. However, the wiring pattern (first joint portion TM1 to sixth joint portion TM6) and the connection portions 7AS-7FS may also be joined by a conductive adhesive as a joining material.

[0087] 11A shows the magnetic detection member 11 and the capacitor 14 disposed in a recess 18R formed in the upper surface of the base member 18, but in reality, the magnetic detection member 11 and the capacitor 14 are attached to the lower surface (the surface on the Z2 side) of the wiring board 10 by soldering or the like, and then incorporated into the base member 18 in a state attached to the wiring board 10. Specifically, the magnetic detection member 11 and the capacitor 14 are housed in the recess 18R as shown in FIG.

[0088] As shown in FIG. 12, the wiring board 10 includes a first land portion LD1 to a sixth land portion LD6 connected to six connection portions (see FIG. 11A) of the magnetic detection member 11, and a seventh land portion LD7 and an eighth land portion LD8 connected to two electrodes of the capacitor 14 (see FIG. 11A).

[0089] The first joint portion TM1 is a joint portion connected to the first current output line (OUT1) and configured to be joined to the connection portion 7AS (see FIG. 11A) of the first metal member 7A. In this embodiment, the first joint portion TM1 is connected to the fifth land portion LD5.

[0090] The second joint portion TM2 is a joint portion connected to the second current output line (OUT2) and configured to be joined to the connection portion 7BS (see FIG. 11A) of the second metal member 7B. In this embodiment, the second joint portion TM2 is connected to the sixth land portion LD6.

[0091] The third joint TM3 is a joint connected to a power supply voltage (VDD) and configured to be joined to the connection portion 7CS (see FIG. 11A) of the third metal member 7C. In this embodiment, the third joint TM3 is connected to the second land portion LD2 and the eighth land portion LD8.

[0092] The fourth joint portion TM4 is a joint portion connected to the data signal line (SDA) and configured to be joined to the connection portion 7DS (see FIG. 11A) of the fourth metal member 7D. In this embodiment, the fourth joint portion TM4 is connected to the third land portion LD3.

[0093] The fifth joint TM5 is a joint connected to the clock signal line (SCL) and is configured to be joined to the connection portion 7ES (see FIG. 11A) of the fifth metal member 7E. In this embodiment, the fifth joint TM5 is connected to the fourth land portion LD4.

[0094] The sixth joint TM6 is a joint connected to the ground voltage (VSS) and configured to be joined to the connection portion 7FS (see FIG. 11A) of the sixth metal member 7F. In this embodiment, the sixth joint TM6 is connected to each of the first land portion LD1 and the seventh land portion LD7.

[0095] With this configuration, the driver IC in the magnetic detection member 11 can receive a command regarding the target position of the lens holding member 2 in the optical axis direction from an external control device or the like through the fourth joint TM4, for example. The driver IC can then identify the current position of the lens holding member 2 based on the magnitude of the magnetic field detected by the Hall element, and increase or decrease the magnitude of the current flowing through the coil 3 so that the difference between the current position and the target position of the lens holding member 2 becomes zero. In other words, the driver IC can achieve feedback control of the position of the lens holding member 2 in the optical axis direction.

[0096] A voltage is applied to the magnetic detection member 11 from a power source (not shown) via the connection 7CS of the third metal member 7C and the connection 7FS of the sixth metal member 7F. At this time, the third metal member 7C is connected to a power supply voltage (VDD), so that the magnetic detection member 11, which is made up of electronic components, is driven by the power supply voltage (VDD). Then, the current output from the magnetic detection member 11 flows from the connection 7AS of the first metal member 7A to the leaf spring connection 7AP under the control of a driver IC, for example, and further flows from the first fixed portion 26d1 of the right lower leaf spring 26R to the right coil connection portion 26hR, and further flows from the right extension portion 33R via the coil 3 to the left extension portion 33L. The current then flows from the left coil connection portion 26hL of the left lower leaf spring 26L to the third fixed portion 26d3, and then from the leaf spring connection portion 7BP of the second metal member 7B to the connection portion 7BS, and further through the wiring pattern on the wiring board 10 to the magnetic detection member 11.

[0097] In the example shown in Figure 10, current flows from connection portion 7AS of the first metal member 7A to connection portion 7BS of the second metal member 7B, but when current flows from connection portion 7BS of the second metal member 7B to connection portion 7AS of the first metal member 7A, the current flows in the opposite direction along the same path.

[0098] The driver IC in the magnetic detection member 11 can change the direction and magnitude of the electromagnetic force generated by the drive mechanism DM by changing the direction and magnitude of the current flowing between the connection portion 7AS of the first metal member 7A and the connection portion 7BS of the second metal member 7B, and as a result, can control the position of the lens holding member 2 in the optical axis direction. In this embodiment, the Hall element in the magnetic detection member 11 detects the magnetic field generated by the detection magnet 8. Then, the driver IC specifies the current position of the lens holding member 2 in the optical axis direction based on the magnitude of the magnetic field detected by the Hall element. Then, the driver IC changes the direction and magnitude of the current flowing between the connection portion 7AS of the first metal member 7A and the connection portion 7BS of the second metal member 7B so that the difference between the current position and the target position of the lens holding member 2 in the optical axis direction becomes zero. In this way, the driver IC can feedback control the position of the lens holding member 2 in the optical axis direction.

[0099] 13A and 13B, a description will be given of the vibration damping structure of the lens holding member 2 in the lens driving device 101. The vibration damping structure of the lens holding member 2 is mainly realized by a vibration damping material DP arranged between the lens holding member 2 and the base member 18.

[0100] FIG. 13A is a top view of the lens holding member 2, the coil 3, the magnet set 5, the base member 18, and the vibration-damping material DP. FIG. 13B is a cross-sectional view of the lens holding member 2, the coil 3, the base member 18, and the vibration-damping material DP, and corresponds to a view of the cross section in a plane including the dashed line L1 and the optical axis OA in FIG. 13A as viewed from the direction indicated by the arrow AR. In addition, in FIG. 13A and FIG. 13B, for clarity, illustrations of members other than the lens holding member 2, the coil 3, the magnet set 5, the base member 18, and the vibration-damping material DP are omitted. In addition, in FIG. 13A and FIG. 13B, for clarity, a fine dot pattern is applied to the lens holding member 2, and a coarse dot pattern is applied to the base member 18. In addition, in FIG. 13A, for clarity, a fine cross pattern is applied to the vibration-damping material DP.

[0101] The vibration-damping material DP is a member for suppressing vibration of the lens holding member 2. The vibration-damping material DP is configured to be elastically expandable and contractable in response to the movement of the lens holding member 2. In this embodiment, the vibration-damping material DP is configured to be able to suppress vibration of the lens holding member 2 without affecting the original movement of the lens holding member 2. The original movement of the lens holding member 2 is, for example, a movement for realizing an automatic focus adjustment function. Specifically, the vibration-damping material DP is a gel-like damper material formed by curing a fluid adhesive with ultraviolet light or heat, and includes a first vibration-damping material DP1 to a fourth vibration-damping material DP4. The vibration-damping material DP may be formed of other materials such as a thermosetting resin, an ultraviolet-curing resin, a thermosetting silicone rubber, or an ultraviolet-curing silicone rubber.

[0102] 9(A), the base member 18 includes four convex projections 18P (first projection 18P1 to fourth projection 18P4) that project upward (in the Z1 direction) from the surface facing the subject (Z1 side). The projections 18P are formed to correspond to the four corners of the base member 18. The projections 18P are configured so that one end of a vibration-damping material DP can be attached to the projections 18P.

[0103] Specifically, the protrusion 18P includes a first protrusion 18P1 formed to correspond to the right front corner of the base member 18, a second protrusion 18P2 formed to correspond to the left front corner, a third protrusion 18P3 formed to correspond to the left rear corner, and a fourth protrusion 18P4 formed to correspond to the right rear corner.

[0104] The lens holding member 2 has a through-hole 2H that receives the protrusion 18P. In the example shown in Figures 13A and 13B, the through-hole 2H is a portion that penetrates the lens holding member 2 along the optical axis direction, and is formed to correspond to each of the four corners of the lens holding member 2. The wall portion that constitutes the through-hole 2H is configured so that the other end of the vibration-damping material DP can be attached thereto.

[0105] Specifically, as shown in FIG. 13A, the through portion 2H includes a first through portion 2H1 formed in the right front corner of the lens holding member 2, a second through portion 2H2 formed in the left front corner, a third through portion 2H3 formed in the left rear corner, and a fourth through portion 2H4 formed in the right rear corner.

[0106] The first through portion 2H1 is configured to receive the first protrusion 18P1, the second through portion 2H2 is configured to receive the second protrusion 18P2, the third through portion 2H3 is configured to receive the third protrusion 18P3, and the fourth through portion 2H4 is configured to receive the fourth protrusion 18P4.

[0107] More specifically, as shown in Fig. 13B, the first vibration-damping material DP1 has one end attached to an inward surface IP of a step portion ST that protrudes toward the optical axis from an outer wall portion OP of the wall portions constituting the first penetrating portion 2H1, and has one end attached to an opposing surface FP of the first protruding portion 18P1. In the example shown in Fig. 13B, the opposing surface FP is a plane facing the inward surface IP, that is, a plane facing radially outward of a circle centered on the optical axis OA.

[0108] Note that while Figure 13B shows the positional relationship of the first vibration-damping material DP1 relative to the first through portion 2H1 and the first protrusion 18P1, this positional relationship also applies to the second vibration-damping material DP2 arranged between the second through portion 2H2 and the second protrusion 18P2, the third vibration-damping material DP3 arranged between the third through portion 2H3 and the third protrusion 18P3, and the fourth vibration-damping material DP4 arranged between the fourth through portion 2H4 and the fourth protrusion 18P4.

[0109] 3A, the through-hole 2H is arranged so as to be covered by the elastic arm portion 16g of the upper leaf spring 16. This configuration brings about an effect that even if the vibration-damping material DP peels off from the facing surface FP and the inward surface IP after hardening, the peeled vibration-damping material DP can be prevented from slipping out of the through-hole 2H.

[0110] 14A and 14B are perspective views from above of the first protruding portion 18P1. Specifically, Fig. 14A is a perspective view from above of the first protruding portion 18P1 to which the first vibration-damping material DP1 is not attached, and Fig. 14B is a perspective view from above of the first protruding portion 18P1 to which the first vibration-damping material DP1 is attached.

[0111] As shown in Fig. 14A, a protruding portion PT that protrudes radially outward is formed on the lower side (Z2 side) of the opposing surface FP of the first protruding portion 18P1. Therefore, a step is formed on the lower side (Z2 side) of the opposing surface FP. In Fig. 14A and Fig. 14B, for clarity, a coarse dot pattern is applied to the base member 18 including the first protruding portion 18P1, and a fine dot pattern is applied to the protruding portion PT of the first protruding portion 18P1. In Fig. 14B, for clarity, a fine cross pattern is applied to the first vibration damping material DP1.

[0112] The overhanging portion PT is configured to prevent the pre-hardened damping material DP applied to the facing surface FP from excessively flowing downward. Due to the presence of this overhanging portion PT, the pre-hardened damping material DP applied to the facing surface FP hardens to have a substantially cylindrical shape as shown in Fig. 14B. In other words, the shape of the hardened damping material DP is determined by the shape of the facing surface FP, the lower side of which is separated by the overhanging portion PT.

[0113] In this embodiment, the height of the step between the facing surface FP and the protruding portion PT is set to be higher than the height of the bottom surface of the flange portion 52 of the lens holding member 2 in the initial state of the lens driving device 101 in which no current flows through the coil 3, as shown in Fig. 13B. This configuration brings about the effect that even if the hardened vibration-damping material DP peels off from the facing surface FP and the inward surface IP, the peeled vibration-damping material DP can be prevented from passing through the gap between the protruding portion 18P and the through portion 2H and reaching the space between the lower surface of the lens holding member 2 and the upper surface of the base member 18.

[0114] FIG. 15 is a top view of the vibration-damping structure, and corresponds to an enlarged view of the range R2 surrounded by the dashed line shown in FIG. 13A. Specifically, FIG. 15(A) is a top view of the first protrusion 18P1 formed so as to correspond to the right front corner of the base member 18. FIG. 15(B) is a top view of the first through-hole 2H1 formed so as to correspond to the right front corner of the lens holding member 2. FIG. 15(C) is a top view of the first protrusion 18P1 received in the first through-hole 2H1. FIG. 15(D) is a top view of the first vibration-damping material DP1 arranged between the outer wall OP of the first through-hole 2H1 and the facing surface FP of the first protrusion 18P1.

[0115] 15(C), the lens holding member 2 is disposed on the upper side (Z1 side) of the base member 18 so that the through-hole 2H receives the protruding portion 18P of the base member 18. Specifically, the lens holding member 2 is disposed so that an inward surface IP of a step portion ST protruding from an outer wall portion OP of the through-hole 2H toward the optical axis side faces an opposing surface FP of the protruding portion 18P of the base member 18 with a gap GP1 therebetween. More specifically, the lens holding member 2 is disposed so that the center of the inward surface IP faces the center of the opposing surface FP when viewed from above.

[0116] In this embodiment, the lens holding member 2 is arranged so that the interval GP1 is larger than the interval GP3 between the inner wall of the through-hole 2H and the protrusion 18P, smaller than the interval GP2 between the left (front) wall of the through-hole 2H and the protrusion 18P, and smaller than the interval GP4 between the right (rear) wall of the through-hole 2H and the protrusion 18P. The lens holding member 2 is arranged so that the intervals GP2 and GP4 are the same size. However, the lens holding member 2 may be arranged so that all of the intervals GP1 to GP4 are the same size. The lens holding member 2 may be arranged so that the interval GP1 is smaller than the interval GP3, or so that the interval GP1 is larger than the intervals GP2 and GP4.

[0117] In this embodiment, the lens holding member 2 is disposed so that the height of the upper surface TP2 of the step portion ST is the same as the height of the upper surface TP1 of the protrusion 18P as shown in Fig. 13B, but the step portion ST may be omitted. That is, the inward surface IP may be the surface of the outer wall portion OP of the through portion 2H. In other words, the outer wall portion OP of the through portion 2H may be located at the position of the inward surface IP in Fig. 15(C).

[0118] As described above, the lens driving device 101 according to the embodiment of the present invention includes a housing HS including a lens holding member 2 having a cylindrical inner peripheral portion 12 capable of holding a lens body, a base member 18 arranged below the lens holding member 2 facing the lens holding member 2 in the optical axis direction, a leaf spring 6 as a support member for supporting the lens holding member 2 movably in the optical axis direction, a coil 3 held at least on an outer peripheral portion 12j of the lens holding member 2, and a magnet (first magnet 5A to fourth magnet 5D as driving magnets) facing the coil 3, and a drive mechanism DM for moving the lens holding member 2 in the optical axis direction, as shown in Fig. 13A and Fig. 13B, the lens holding member 2 has a through portion 2H penetrating in the optical axis direction between the inner peripheral portion 12 and the outer peripheral portion 12j, the base member 18 has a protruding portion 18P inserted into the through portion 2H, and a vibration-damping material DP is arranged between the wall portion constituting the through portion 2H and the protruding portion 18P.

[0119] This configuration provides an effect of providing a lens driving device 101 to which the vibration-damping material DP can be attached more appropriately. In this configuration, the vibration-damping material DP is arranged inside the outer periphery 12j of the lens holding member 2 (at a position closer to the optical axis OA) and is not affected by differences in the size and number of driving magnets. In addition, this configuration provides an effect of making the outer dimensions of the lens driving device 101 smaller than when the vibration-damping material DP is arranged outside the outer periphery 12j of the lens holding member 2 (at a position farther from the optical axis OA) because the vibration-damping material DP is arranged inside the outer periphery 12j of the lens holding member 2 (at a position closer to the optical axis OA). In addition, this configuration provides an effect of facilitating application of the vibration-damping material DP because the through-hole 2H formed by the wall portion penetrates the lens holding member 2 in the optical axis direction, that is, because the through-hole 2H opens upward.

[0120] As shown in FIG. 2A, the housing HS is formed to have a substantially rectangular shape in a top view along the optical axis direction. The through-hole 2H and the protrusion 18P are provided at positions corresponding to the corners of the housing HS as shown in FIG. 13A. Specifically, in the example shown in FIG. 13A, the first through-hole 2H1 and the first protrusion 18P1 are provided at positions corresponding to the right front corner of the housing HS (cover member 4). That is, the first through-hole 2H1 and the first protrusion 18P1 are provided so that the direction of the right front corner as viewed from the optical axis OA, the direction of the first through-hole 2H1 as viewed from the optical axis OA, and the direction of the first protrusion 18P1 as viewed from the optical axis OA coincide with each other. Similarly, the second through portion 2H2 and the second protrusion 18P2 are provided at a position corresponding to the left front corner of the housing HS (cover member 4), the third through portion 2H3 and the third protrusion 18P3 are provided at a position corresponding to the left rear corner of the housing HS (cover member 4), and the fourth through portion 2H4 and the fourth protrusion 18P4 are provided at a position corresponding to the right rear corner of the housing HS (cover member 4).

[0121] This configuration provides the effect of preventing the lens driving device 101 from becoming larger, or of realizing a smaller size of the lens driving device 101, because the vibration-damping material DP is arranged at a position corresponding to the corner of the housing HS (a portion not used for any purpose). That is, this configuration provides the effect of preventing the lens driving device 101 from becoming larger, because the vibration-damping material DP can be arranged inside the lens holding member 2 without securing new space outside the lens holding member 2 for realizing a vibration-damping structure. Alternatively, this configuration provides the effect of realizing a smaller size of the lens driving device 101, compared to a configuration in which the vibration-damping material is arranged outside the lens holding member 2.

[0122] The through-hole 2H and the protruding portion 18P are provided at positions corresponding to the four corners of the housing HS, as shown in FIG. 13A. The vibration-damping material DP is provided at positions corresponding to the four corners of the housing HS, as shown in FIG. 13A. A magnet longer than the distance between the two protruding portions 18P corresponding to the two adjacent corners is provided along the side plate portion of the housing HS located between the two corners. In the example shown in FIG. 13A, the first protruding portion 18P1 is provided at a position corresponding to the right front corner of the housing HS (cover member 4), the second protruding portion 18P2 is provided at a position corresponding to the left front corner of the housing HS (cover member 4), the third protruding portion 18P3 is provided at a position corresponding to the left rear corner of the housing HS (cover member 4), and the fourth protruding portion 18P4 is provided at a position corresponding to the right rear corner of the housing HS (cover member 4). A second magnet 5B having a length LG2 longer than the distance LG1 between the second protrusion 18P2 and the third protrusion 18P3, which are two protrusions 18P corresponding to two adjacent corners, is provided along the second side plate portion 4A2 of the housing HS (cover member 4) located between those two corners.

[0123] This configuration allows the driving magnet placed inside the housing HS to be larger, which has the effect of increasing the thrust force of the driving mechanism DM. Specifically, this configuration increases the number of magnetic fluxes that perpendicularly cross the winding portion 13 of the coil 3 among the magnetic fluxes generated by the driving magnet, which in turn increases the Lorentz force acting on the coil 3, which has the effect of increasing the thrust force of the driving mechanism DM.

[0124] An opening 18k is formed in the center of the base member 18. Then, as shown in Fig. 13B, the wall portion constituting the through portion 2H has an inward surface IP facing the optical axis OA, the protrusion 18P (first protrusion 18P1) has an opposing surface FP facing the inward surface IP, and the vibration damping material DP (first vibration damping material DP1) is provided so as to connect the inward surface IP and the opposing surface FP.

[0125] In this configuration, even if the damping material DP falls off the lens holding member 2 and the base member 18 due to, for example, the lens driving device 101 being dropped, the damping material DP is unlikely to come out of the through-hole 2H. This is because the damping material DP is disposed on the outside of the protruding portion 18P (the side farther from the opening 18k of the base member 18). In other words, the damping material DP is prevented from moving to the inside of the protruding portion 18P (the side closer to the opening 18k of the base member 18) by the protruding portion 18P. Therefore, this configuration can prevent the fallen damping material DP from moving through the opening 18k of the base member 18 toward the imaging element side.

[0126] Typically, as shown in FIG. 13B, the facing surface FP is a flat surface, and a protruding portion PT that protrudes outward is formed on the lower side of the facing surface FP via a step.

[0127] This configuration brings about an effect that the downward movement of the hardened vibration-damping material DP can be suppressed by the protruding portion PT (step). Note that the facing surface FP may be a curved surface.

[0128] Typically, as shown in Fig. 13B, the inward surface IP is a flat surface and is formed in a step portion ST that protrudes from the outer wall portion OP toward the optical axis side. In the initial state of the lens driving device 101 where no current flows through the coil 3, the upper surface TP1 (see Fig. 14A) of the protrusion portion 18P and the upper surface TP2 (see Fig. 15(B)) of the step portion ST are located at approximately the same height HT1 in the optical axis direction. In the example shown in Fig. 13B, the height HT1 is the height from the bottom surface of the base member 18.

[0129] This configuration provides the advantage that the height (position of the upper end) of the vibration-damping material DP after hardening is stabilized since the height (position of the upper end) of the vibration-damping material DP when the vibration-damping material DP is hardened is restricted by the upper surface TP1 of the protrusion 18P and the upper surface TP2 of the step portion ST. Note that the inward surface IP may be a curved surface.

[0130] As shown in Fig. 4A and Fig. 4B, the winding portion 13 of the coil 3 is provided so as to surround the outer periphery 12j of the lens holding member 2. As shown in Fig. 13B, the winding portion 13 of the coil 3 and the protruding portion 18P of the base member 18 are configured so that at least a part of them is located at the same height in the optical axis direction. In the example shown in Fig. 13B, the winding portion 13 of the coil 3 and the first protruding portion 18P1 of the base member 18 overlap when viewed from a direction perpendicular to the optical axis direction (the direction of the right front corner) in a range that is equal to or higher than the height HT2 of the upper surface of the flange portion 52 and equal to or lower than the height HT1 of the upper surface TP1 of the first protruding portion 18P1.

[0131] This configuration has the advantage that the height dimension of lens driving device 101 can be made smaller than a configuration in which winding portion 13 of coil 3 and protrusion portion 18P of base member 18 do not overlap when viewed from a direction perpendicular to the optical axis direction.

[0132] 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 may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, each of the features described with reference to the above-described embodiments may be appropriately combined unless technically inconsistent.

[0133] For example, in the above embodiment, the magnet set 5 includes four magnets (first magnet 5A to fourth magnet 5D) arranged along each of the first side plate portion 4A1 to fourth side plate portion 4A4. However, only two magnet sets 5 may be arranged along each of the first side plate portion 4A1 and the third side plate portion 4A3, or only two magnet sets 5 may be arranged along each of the second side plate portion 4A2 and the fourth side plate portion 4A4.

[0134] For example, in the above embodiment that realizes the automatic focus adjustment function, as shown in FIG. 10, the right lower leaf spring 26R and the right extension portion 33R are electrically connected, and the left lower leaf spring 26L and the left extension portion 33L are electrically connected, but the present invention is not limited to this configuration. For example, in a lens driving device with a camera shake correction function, the present invention may include a configuration in which the upper leaf spring 16 is divided into two, one of which is electrically connected to the right extension portion 33R, and the other is electrically connected to the left extension portion 33L. In this configuration, the upper leaf spring 16 is arranged to connect the magnet holder and the lens holding member 2, and is configured to support the lens holding member 2 so as to be movable in the optical axis direction. The magnet holder is a member that holds the magnet set 5 that faces the coil 3 held by the lens holding member 2, and is typically connected to the base member 18 via a suspension wire, and is supported by the suspension wire so as to be movable in a direction perpendicular to the optical axis direction. Specifically, the magnet holder is configured to be movable in a direction perpendicular to the optical axis direction by a drive mechanism configured of the magnet set 5 and a coil other than the coil 3 that is installed on the base member 18 so as to face the magnet set 5. In this case, the holding part 72 may be provided on the upper end part of the lens holding member 2 on the side where the upper leaf spring 16 is arranged. Also, it is preferable that the magnetic detection member 11 is held by the magnet holder. Note that, unlike the lens holding member 2 that moves in the optical axis direction, the magnet holder is a member that does not move in the optical axis direction. For this reason, in a lens driving device with a camera shake correction function, the magnet holder constitutes a fixed side member.

[0135] In the above embodiment, the coil 3 is wound around the lens holding member 2 so as to have a coil axis extending in the optical axis direction. However, the present invention is not limited to this configuration. The coil 3 may be configured as an oval-shaped coil held on two or each of the four side surfaces of the lens holding member 2 and having a coil axis perpendicular to the optical axis direction.

[0136] In the above embodiment, the magnetic detection member 11 is configured with an electronic component incorporating a Hall element and a driver IC, but it may be configured with a magnetic detection element such as a Hall element or a magnetoresistance effect element without including a driver IC. In this case, the magnetic detection element outputs a detection signal to a control unit outside the lens driving device 101. Then, the control unit controls the current supplied from the control unit to the coil 3 based on the detection signal.

[0137] In the above embodiment, the protrusion 18P has a quadrangular prism shape, but may have other shapes such as a circular cylinder, an elliptical cylinder, or a polygonal prism. The protruding portion PT of the protrusion 18P may be formed on the tip side of the protrusion 18P instead of the base side. In this case, the opposing surface FP may be formed on the protruding portion PT. Alternatively, the protruding portion PT of the protrusion 18P may be omitted.

[0138] In the above embodiment, the through-hole 2H is a through-hole having a substantially rectangular outline in top view, but may be a through-hole having other shapes such as a circle, an ellipse, or a polygon in top view. By configuring the through-hole 2H as a through-hole, i.e., by configuring it to open upward, the vibration-damping material DP is easily applied from above between the inward surface IP of the through-hole 2H and the opposing surface FP of the protrusion 18P. Note that the through-hole 2H may be a notch.

[0139] In the above embodiment, the vibration-damping material DP is disposed between one of the four side surfaces of the protrusion 18P and one of the four wall surfaces of the through-hole 2H. However, the vibration-damping material DP may be disposed between two or more of the four side surfaces of the protrusion 18P and two or more of the four wall surfaces of the through-hole 2H. For example, the vibration-damping material DP may be disposed so as to adhere to the entire circumference of the side surface of the protrusion 18P and the entire circumference of the wall surface of the through-hole 2H. Furthermore, the vibration-damping material DP may be disposed so as to adhere to the upper surface TP1 of the protrusion 18P of the base member 18, or may be disposed so as to adhere to the upper surface TP2 of the step portion ST of the lens holding member 2. [Explanation of symbols]

[0140] DESCRIPTION OF SYMBOLS 1 Spacer 2 Lens holding member 2H Through portion 2H1 First through portion 2H2 Second through portion 2H3 Third through portion 2H4 Fourth through portion 2t Protruding portion 3 Coil 4 Cover member 4A Outer peripheral wall portion 4A1 First side plate portion 4A2 Second side plate portion 4A3 Third side plate portion 4A4 Fourth side plate portion 4B Top plate portion 4K Opening 4S Storage portion 5 Magnet set 5A First magnet 5B Second magnet 5C Third magnet 5D Fourth magnet 6 Leaf spring 7 Metal member 7A First metal member 7AP···Leaf spring connection part 7AS···Connection part 7AT···Terminal part 7B···Second metal part 7BP···Leaf spring connection part 7BS···Connection part 7BT···Terminal part 7C···Third metal part 7CS···Connection part 7CT···Terminal part 7D···Fourth metal part 7DS···Connection part 7DT···Terminal part 7E···Fifth metal part 7ES···Connection part 7ET···Terminal part 7F···Sixth metal part 7FS···Connection part 7FT···Terminal part 7X···Eleventh metal part 7XPL···Left rear end part 7XPR···Right rear end part 7Y···Twelfth metal part 7YPL···Left front end part 7Z···Thirteenth metal part Description of the Preferred Embodiment 7ZPR... Right front end 8... Detection magnet 9... Balancing magnet 10... Wiring board 11... Magnetic detection member 12... Inner circumference 12d... Base 12dh... Recess 12h... Eaves 12j... Outer circumference 13... Winding 14... Capacitor 16... Upper leaf spring 16b... Corner 16e... Outer portion 16f... Crosspiece 16g... Elastic arm 16i... Inner portion 18... Base member 18k... Opening 18P... Protruding portion 18P1... First protruding portion 18P2... Second protruding portion 18P3... Third protruding portion 18P4... Fourth protruding portion 18R... Recess 18s···Side portion 18s1···First side portion 18s2···Second side portion 18s3···Third side portion 18s4···Fourth side portion 18t···Protruding portion 18t1···First protruding portion 18t2···Second protruding portion 18t3···Third protruding portion 18t4···Fourth protruding portion 18t5···Fifth protruding portion 18t6···Sixth protruding portion 26···Lower leaf spring26c Inner joint part 26d Fixed part 26d1 First fixed part 26d2 Second fixed part 26d3 Third fixed part 26d4 Fourth fixed part 26e Outer part 26f Crosspiece part 26g Elastic arm part 26g1 First elastic arm part 26g2 Second elastic arm part 26g3 Third elastic arm part 26g4 Fourth elastic arm part 26h Coil connection part 26hL Left coil connection part 26hR Right coil connection part 26i Inner part 26L Left lower leaf spring 26p Connecting part 26R Right lower leaf spring 26s, 26t, 26v Through hole 33... Extension portion 33c... Connection portion 33k... Insertion portion 33L... Left extension portion 33m... Winding portion 33R... Right extension portion 52... Flange portion 52k... Cutout portion 72... Holding portion 72L... Left holding portion 72R... Right holding portion 82s... Storage portion 101... Lens drive device CP... Conductive path CP1... First conductive path CP2... Second conductive path DM... Drive mechanism DP... Vibration damping material DP1... First vibration damping material DP2... Second vibration damping material DP3... Third vibration damping material DP4... Fourth vibration damping material FB... Fixed side member FP... Opposing surface HS... Housing IP... Inward surface LD1...1st land LD2...2nd land LD3...3rd land LD4...4th land LD5...5th land LD6...6th land LD7...7th land LD8...8th land OA...Optical axis OP...Wall PT...Projection ST...Step TM...Joint TM1...1st joint TM2...2nd joint TM3...3rd joint TM4...4th joint TM5...5th joint TM6...6th joint TP1, TP2...Top surface

Claims

1. a lens holding member having an inner peripheral portion capable of holding a lens body; a housing including a base member disposed opposite the lens holding member in the optical axis direction; a support member that supports the lens holding member so as to be movable in the optical axis direction; A lens driving device having a driving mechanism including at least a coil held on an outer periphery of the lens holding member and a magnet facing the coil, the driving mechanism moving the lens holding member in an optical axis direction, the lens holding member has a through-portion penetrating in the optical axis direction between the inner peripheral portion and the outer peripheral portion, the base member has a protrusion that is inserted into the through-hole, a vibration-damping material is disposed between a wall portion constituting the through portion and the protruding portion, The housing is formed in a substantially rectangular shape when viewed from above along the optical axis direction, The through portion and the protrusion are provided at positions corresponding to corners of the housing. A lens driving device comprising:

2. A lens holding member having an inner peripheral portion capable of holding a lens body; a housing including a base member disposed opposite the lens holding member in the optical axis direction; a support member that supports the lens holding member so as to be movable in the optical axis direction; A lens driving device having a driving mechanism including at least a coil held on an outer periphery of the lens holding member and a magnet facing the coil, the driving mechanism moving the lens holding member in an optical axis direction, the lens holding member has a through-portion penetrating in the optical axis direction between the inner peripheral portion and the outer peripheral portion, the base member has a protrusion that is inserted into the through-hole, a vibration-damping material is disposed between a wall portion constituting the through portion and the protruding portion, An opening is formed in the center of the base member, The wall portion constituting the through portion has an inward surface facing the optical axis side, The protrusion has an opposing surface facing the inward surface, The vibration-damping material is provided so as to connect the inward surface and the opposing surface. A lens driving device comprising:

3. the through-holes and the protrusions are provided at positions corresponding to four corners of the housing, The vibration-damping materials are provided at positions corresponding to the four corners of the housing, a magnet having a length longer than the distance between the two protrusions corresponding to two adjacent corners is provided along a side plate portion of the housing located between the two corners; 3. The lens driving device according to claim 1.

4. The opposing surface is a flat surface, A protruding portion that protrudes outward is formed on the lower side of the opposing surface. The lens driving device according to claim 2 .

5. the inward surface is a flat surface and is formed on a step portion protruding from the wall portion toward the optical axis side, In an initial state of the lens driving device in which no current is flowing through the coil, an upper surface of the step portion and an upper surface of the protrusion portion are positioned at substantially the same height in the optical axis direction.

5. The lens driving device according to claim 2 or 4.

6. the coil winding portion is provided so as to surround the outer circumferential portion of the lens holding member, and at least a part of the coil winding portion and the protruding portion are positioned at the same height in the optical axis direction.

6. The lens driving device according to claim 1.

7. A lens driving device according to any one of claims 1 to 6, The lens body; An imaging element facing the lens body, Camera module.

Images