CN114200627A

CN114200627A - Lens driving device and camera module

Info

Publication number: CN114200627A
Application number: CN202110985992.8A
Authority: CN
Inventors: 瓦井究
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2020-08-26
Filing date: 2021-08-26
Publication date: 2022-03-18
Anticipated expiration: 2041-08-26
Also published as: CN114200627B; JP2022038456A; JP7525335B2

Abstract

The utility model provides a lens driving device capable of reducing the conduction resistance between a terminal and a plate spring. In the lens driving device (101), a current is supplied to a coil (3) through a first metal component (7A), a second metal component (7B), a first lower plate spring (26A) and a second lower plate spring (26B). The first lower leaf spring (26A) has a first fixing portion (26d1), a second fixing portion (26d2), a first elastic arm portion (26g1), and a second elastic arm portion (26g 2). The first metal member (7A) has a first leaf spring connection section (7AP1) and a second leaf spring connection section (7AP2) that are connected to each other via a connection section (7 AJ). The first fixing portion (26d1) is connected to the first leaf spring connecting portion (7AP1), and the second fixing portion (26d2) is connected to the second leaf spring connecting portion (7AP 2). Two Conductive Paths (CP) are formed between the external terminal section (7AT) of the first metal member (7A) and the first coil connection section (26hA) of the first lower leaf spring (26A).

Description

Lens driving device and camera module

Technical Field

The present disclosure relates to a lens driving device mounted in, for example, a portable device with a camera, and a camera module including the lens driving device.

Background

Conventionally, a lens driving device configured to supply a current to a coil attached to a lens holding member via a plate spring supporting the lens holding member is known (see patent document 1).

In the lens driving device, a pair of terminals made of a metal plate embedded in the base member is electrically connected to the pair of lower leaf springs. Further, a power supply voltage external to the lens driving device is connected to one end of the coil via one of the pair of terminals and one of the pair of lower plate springs, and the other end of the coil is grounded via the other of the pair of terminals and the other of the pair of lower plate springs.

Documents of the prior art

Patent document

Patent document 1: japanese invention registration No. 3183931

Disclosure of Invention

However, in the above configuration, one of the pair of terminals is electrically connected to one of the pair of lower leaf springs at one location, and similarly, the other of the pair of terminals is electrically connected to the other of the pair of lower leaf springs at one location. Therefore, the on-resistance between the terminal and the lower plate spring may be increased.

Therefore, it is desirable to provide a lens driving device capable of reducing the on-resistance between the terminal and the plate spring.

A lens driving device according to an embodiment of the present invention includes: a lens holding member capable of holding a lens body; a coil provided on the lens holding member; a magnet facing the coil; a base member which is disposed below the lens holding member and in which a metal member is embedded; and a support member configured to connect the lens holding member to the base member and to support the lens holding member so as to be movable in an optical axis direction, the support member including a first plate spring connected to one end of the coil and a second plate spring connected to the other end of the coil, the first plate spring and the second plate spring each including: a fixed side support part fixed to the base member; a movable side support part fixed to the lens holding member; an elastic arm portion provided between the fixed-side support portion and the movable-side support portion; and a coil connecting portion connected to the coil, the metal member including: a first metal member including an external terminal portion exposed to the outside from the base member and a plate spring connecting portion to which the fixed-side supporting portion of the first plate spring is connected; and a second metal member including an external terminal portion exposed to the outside from the base member and a plate spring connecting portion to which the fixed-side supporting portion of the second plate spring is connected, wherein the lens driving device supplies a current to the coil via the first metal member, the second metal member, the first plate spring, and the second plate spring, wherein the fixed-side supporting portion of the first plate spring has a first fixing portion and a second fixing portion fixed to positions of the base member that are separated from each other, the elastic arm portion of the first plate spring has a first elastic arm portion connected to the first fixing portion and a second elastic arm portion connected to the second fixing portion, and the plate spring connecting portion of the first metal member has a first plate spring connecting portion and a second plate spring connecting portion connected to each other via a connecting portion, the first fixing portion of the first plate spring is connected to the first plate spring connecting portion, the second fixing portion of the first plate spring is connected to the second plate spring connecting portion, and two conductive paths are formed between the external terminal portion of the first metal member and the coil connecting portion of the first plate spring.

Effects of the utility model

The lens driving device can reduce the on-resistance between the terminal and the plate spring.

Drawings

Fig. 1 is an exploded perspective view of a lens driving device.

Fig. 2 is a top perspective view and a front view of the lens driving apparatus.

Fig. 3 is a top view and a bottom view of the lens driving device.

Fig. 4 is a top perspective view and a front view of the lens driving device in a state where the housing and the spacer are detached.

Fig. 5 is a top perspective view of the lens holding member.

Fig. 6 is a bottom perspective view of the lens holding member.

Fig. 7 is a plan view and a front view of the lens holding member.

Fig. 8 is a bottom perspective view of the lens holding member.

Fig. 9 is an enlarged view of a part of the lens holding member.

Fig. 10 is a bottom view of the lens driving device with parts omitted.

Fig. 11 is a plan view of the upper plate spring and a plan view of the lower plate spring.

Fig. 12 is a diagram illustrating an example of connection between a leaf spring and a coil in the lens driving device.

Fig. 13 is a top perspective view of the base member.

Fig. 14 is a top perspective view of the metal member, the lower leaf spring, and the coil.

Fig. 15 is a top perspective view of the lens holding member and the base member.

Fig. 16 is a diagram showing a positional relationship among the lens holding member, the lower plate spring, and the base member.

Fig. 17 is a top perspective view of the base member.

Reference numerals

1 … … spacer 2 … … lens holding member 2P … … protrusion 2P1 … … first protrusion 2P1 … … second protrusion 2t 1 … … protrusion arrangement 31 … … coil 4a1 … … housing 4a1 … … outer peripheral wall 4a1 … … first side plate 4a1 … … second side plate 4a1 … … third side plate 4a1 … … fourth side plate 4B 1 … … top plate 4k 1 … … opening 4s 1 … … receiving 5 1 … … magnet group 5a 1 … … second magnet 5C 1 … … third magnet 5D 1 … … fourth magnet 6 1 … … leaf spring 7B 1 … … first leaf spring 7a 1 … … metal component 7a 7AJ 1 … … AP1 … … leaf spring connecting portion 7AP1 … … first leaf spring connecting portion 7AP1 … … second leaf spring 7BT 72 outer terminal portion 7B 1 … … leaf spring 7B 7BT 72 outer terminal portion 7B 1 … … 12 … … tubular part 12d … … base part 12dh … … depression 12h … … cornice 12j … … coil support part 13 … … winding part 16 … … upper side leaf spring 16b … … corner part 16e … … outer side part 16g … … elastic arm 16i … … inner side part 16r … … frame 18 … … base part 18k … … opening 18m … … vestige 18P … … convex 18P1 … … first convex 18P2 … … second convex 18s … … side 18s1 … … first side 18s2 … … second side 18s3 … … third side 18s4 … … fourth side 18t … … protrusion setting 18t1 … … first protrusion setting 18t2 … … second protrusion setting 18t3 … … third protrusion setting 18t4 … … fourth protrusion setting 18U … … concave 18U1 … … first concave 18U2 … … second concave 18U3 … … third concave 18U4 … … fourth concave 18U4 … … 26 … … lower leaf spring 26a … … first lower leaf spring 26B … … second lower leaf spring 26c … … inner engaging portion 26d … … securing portion 26d1 … … first securing portion 26d2 … … second securing portion 26d3 … … third securing portion 26d4 … … fourth securing portion 26e … … outer portion 26g … … resilient arm 26g1 … … first resilient arm 26g2 … … second resilient arm 26g3 … … third resilient arm 26g4 … … fourth resilient arm 26h … … coil connecting portion 26hA … … first coil connecting portion 26hB … … second coil connecting portion 26i … … inner portion 26p …

… coupling portions

26s, 26t, 26v … … through

holes

33, 33A, 33B … … extending portion 33c … … connecting portion 33k … … insertion 33m … … winding 52 … … flange 52k … … notch 72 k 72 … … holding portion 72a … … first holding portion 72B … … second holding part 82 … … protruding bank 82s … … accommodating part 82u … … inside wall 82v … … outside wall 82w … … side 82z … … opening part 101 … … lens driving device AD … … adhesive CA … … conductive adhesive CP … … conductive path CP1 … … first conductive path CP2 … … second conductive path JD … … optical axis LS … … lens body MK … … driving mechanism RG … … fixed side part SF1, SF2 … … side ST … … stopper ST1 … … first stopper ST2 … … second stopper ST2 … …

Detailed Description

Hereinafter, a lens driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of a lens driving device 101. Fig. 2 (a) is a top perspective view of the lens driving device 101, and fig. 2 (B) is a front view of the lens driving device 101 as viewed from the Y2 side. Fig. 3 (a) is a plan view of the lens driving device 101, and fig. 3 (B) is a bottom view of the lens driving device 101. Fig. 4 (a) is a top perspective view of the lens driving device 101 in a state where the spacer 1 and the housing 4 are detached, and corresponds to fig. 2 (a). Fig. 4 (B) is a front view of the lens driving device 101 in a state where the spacer 1 and the housing 4 are detached, as viewed from the Y2 side, and corresponds to fig. 2 (B).

As shown in fig. 1, the lens driving device 101 includes: a lens holding member 2 capable of holding a lens body LS; a drive mechanism MK for moving the lens holding member 2 in the optical axis direction (Z-axis direction); a plate spring 6 as a support member that supports the lens holding member 2 so as to be movable in the optical axis direction; and a fixed-side member RG to which the plate spring 6 is fixed. The lens body LS is, for example, a cylindrical lens barrel including at least one lens, and is configured such that the central axis thereof is along the optical axis direction. The optical axis direction includes a direction of an optical axis JD associated with the lens body LS and a direction parallel to the optical axis JD.

As shown in fig. 1, the drive mechanism MK includes a coil 3 wound in a ring shape and a magnet group 5 disposed to face the coil 3. The fixed-side member RG includes the spacer 1, the rectangular box-shaped bottomless case 4 as a cover member, and the base member 18 in which the metal member 7 is embedded.

The metal member 7 includes a first metal member 7A and a second metal member 7B that electrically connect to the outside. As shown in fig. 1, the plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the spacer 1 and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a first lower leaf spring 26A and a second lower leaf spring 26B.

As shown in fig. 2 (a), the housing 4 is joined to the base member 18 to constitute a frame together with the base member 18. The case 4 has a rectangular tubular outer peripheral wall portion 4A and a flat annular top plate portion 4B provided so as to be continuous with the upper end (end on the Z1 side) of the outer peripheral wall portion 4A.

The outer peripheral wall portion 4A includes four side plate portions formed in a flat plate shape. Specifically, as shown in fig. 1, the side panels include a first side panel 4a1 and a third side panel 4A3 facing each other, and a second side panel 4a2 and a fourth side panel 4a4 perpendicular to and facing each other, respectively, the first side panel 4a1 and the third side panel 4 A3. Each of the first side panel portion 4a1 and the third side panel portion 4A3 and each of the second side panel portion 4a2 and the fourth side panel portion 4a4 are typically perpendicular to each other. A substantially circular opening 4k is formed in the center of the top plate 4B.

The lens driving device 101 has a substantially rectangular parallelepiped shape, and is mounted on a substrate (not shown) on which an imaging element (not shown) is mounted. The lens driving device 101, the lens body LS attached to the lens holding member 2, and the imaging element and the substrate attached to the substrate so as to face the lens body LS constitute a camera module. The coil 3 is connected to one of a power supply voltage and a ground voltage via, for example, the first lower leaf spring 26A, the first metal member 7A, and a conductive pattern formed on the substrate, and is connected to the other of the power supply voltage and the ground voltage via the second lower leaf spring 26B, the second metal member 7B, and the conductive pattern formed on the substrate. When a current flows through the coil 3, the driving mechanism MK generates an electromagnetic force along the optical axis direction.

The lens driving device 101 moves the lens holding member 2 in the optical axis direction on the Z1 side (object side) of the image pickup element by the electromagnetic force, thereby realizing an autofocus function. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image pickup device to perform macro photography, and moves the lens holding member 2 in a direction close to the image pickup device to perform infinite photography.

Next, the lens holding member 2 and the drive mechanism MK will be described. Fig. 5 (a) is a top perspective view of the lens holding member 2, and fig. 5 (B) is a top perspective view showing a state in which the coil 3 is wound around the lens holding member 2 in fig. 5 (a). Fig. 6 (a) is a bottom perspective view of the lens holder 2, and fig. 6 (B) is a bottom perspective view showing a state in which the coil 3 is wound around the lens holder 2 in fig. 6 (a). Fig. 7 (a) is a plan view of the lens holding member 2, and fig. 7 (B) is a front view of the lens holding member 2 as viewed from the Y2 side. Fig. 8 (a) is a bottom perspective view of the lens holder 2, and fig. 8 (B) is a bottom perspective view showing a state in which the coil 3 is wound around the lens holder 2 shown in fig. 8 (a). Fig. 9 (a) is an enlarged view of a portion R1 surrounded by a broken line shown in fig. 8 (B), and fig. 9 (B) is an enlarged view of a portion R2 surrounded by a broken line shown in fig. 6 (B). Fig. 10 (a) is a bottom view of the lens driving device 101 in a state where the metal member 7 and the base member 18 are omitted, and fig. 10 (B) is a bottom view of the lens driving device 101 in a state where the lower plate spring 26 and the lens holding member 2 are further omitted.

In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, as shown in fig. 5a, the lens holding member 2 includes a cylindrical portion 12 having a through hole along the optical axis direction and a flange portion (eaves portion) 52 as a first protruding portion formed on the image pickup device side (Z2 side) in the optical axis direction. In the present embodiment, the flange portion 52 is formed to protrude radially outward, that is, in a direction perpendicular to the optical axis direction.

In the present embodiment, a screw groove is provided on the inner peripheral surface of the through hole of the cylindrical portion 12 so that the lens body LS is attached thereto. However, the lens body LS may be fixed to the cylindrical portion 12 by an adhesive. In this case, the thread groove may be omitted. Further, four base portions 12d are provided on the end surface of the cylindrical portion 12 on the subject side. Recesses 12dh are formed in the upper surfaces of the four base portions 12d, respectively. As shown in fig. 4 (a), the inner portion 16i of the upper leaf spring 16 is placed on the base portion 12d and fixed by an adhesive.

As shown in fig. 5 (a), a coil support portion 12j as an outer wall portion that supports the coil 3 from the inside is provided on the outer peripheral surface of the cylindrical portion 12. In the present embodiment, the coil support portion 12j has an octagonal outer shape in plan view so as to be able to support the coil 3 having an octagonal annular outer shape in plan view.

On the subject side of the coil support portion 12j, there are formed four eaves 12h as second protrusions, and the eaves 12h protrude radially outward so as to face the flange 52 as a first protrusion in the optical axis direction. In the present embodiment, the brim portion 12h is formed to protrude outward toward the side plate portion of the case 4, that is, in a direction perpendicular to the optical axis direction. As shown in fig. 5 (B), the coil 3 is wound in a ring shape around the outer circumferential surface of the lens holding member 2 so as to be supported by the coil support portion 12j and sandwiched between the flange portion 12h and the flange portion 52 in the optical axis direction. The base portion 12d is disposed above the brim portion 12 h.

The flange portion 52 projects radially outward from the outer peripheral surface of the portion of the cylindrical portion 12 on the imaging element side (Z2 side). The coil 3 is disposed on the subject side of the flange portion 52. As shown in fig. 6 (B), two notches 52k are formed in the flange portion 52 with the optical axis JD of the lens body LS interposed therebetween. Further, an extension 33B, which is a portion on the winding start side of the wire rod constituting the coil 3, is passed through one of the two cutout portions 52k, and an extension 33A, which is a portion on the winding end side of the wire rod constituting the coil 3, is passed through the other one of the two cutout portions 52 k. The edge of flange 52 formed with notch 52k is configured to be curved. This is to prevent the wire material contacting the edge portion from being cut.

As shown in fig. 6 (a), the flange portion 52 includes: two holding portions 72 each having a square convex shape and projecting downward (in the Z2 direction) from the image pickup device side (Z2 side), two projecting portions 2t each having a circular convex shape, and two banks 82. The two banks 82 are formed of three wall portions (inner wall portion 82u, outer wall portion 82v, and side wall portion 82w), respectively. Specifically, the bank 82 is formed of a stepped portion formed on the bottom surface of the lens holding member 2.

As shown in fig. 6B, the holding portion 72 includes a first holding portion 72A corresponding to the winding end side of the coil 3 (winding portion 13) and a second holding portion 72B corresponding to the winding start side of the coil 3 (winding portion 13). Both ends of the coil 3 are wound and held by the holding portions 72.

As shown in fig. 6 (a) and 10 (a), the protruding portions 2t include three protruding portions 2t corresponding to the first lower leaf spring 26A and three protruding portions 2t corresponding to the second lower leaf spring 26B. The projecting portion 2t is fixed to an inner portion 26i of each of the first lower leaf spring 26A and the second lower leaf spring 26B. The fixing of the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B is achieved by heat caulking the protruding portions 2t inserted into the through holes 26t (see fig. 11B) formed in the inner portions 26 i. In addition, the hot riveting may be cold riveting. In fig. 6 (a) and 6 (B), the projection portion 2t is shown in a state where the tip end is deformed after the heat caulking. The same applies to other figures.

As shown in fig. 6 (a), the bank 82 includes: an inner wall portion 82u located on the center side of the lens holding member 2; an outer wall portion 82v located on the outer side and facing the inner wall portion 82 u; and a side wall portion 82w located between the inner wall portion 82u and the outer wall portion 82v on the side close to the holding portion 72. As shown in fig. 9 (B), an opening 82z having a cut-away wall portion is formed on the side of the bank portion 82 away from the holding portion 72. A space surrounded by the three wall portions (the inner wall portion 82u, the outer wall portion 82v, and the side wall portion 82w) forms the housing portion 82 s. In the present embodiment, the bank portion 82 is formed at a position adjacent to the holding portion 72, and therefore, a side wall of the holding portion 72 is preferably used as the side wall portion 82w of the bank portion 82. That is, the accommodating portion 82s is provided at a position adjacent to the holding portion 72. The housing portion 82s located in the vicinity of the first holding portion 72A is configured to be able to house a conductive adhesive that connects the extension portion 33A of the coil 3 and the first lower leaf spring 26A. Similarly, the housing portion 82s located in the vicinity of the second holding portion 72B is configured to be able to house a conductive adhesive for connecting the extension portion 33B of the coil 3 and the second lower leaf spring 26B.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10B, the drive mechanism MK includes the coil 3 and the magnet group 5 disposed so as to face the four side plates (the first side plate 4a1 to the fourth side plate 4a4) constituting the case 4. Specifically, the magnet group 5 includes first to fourth magnets 5A to 5D. The first magnet 5A is disposed to face the first side plate portion 4a1, the second magnet 5B is disposed to face the second side plate portion 4a2, the third magnet 5C is disposed to face the third side plate portion 4A3, and the fourth magnet 5D is disposed to face the fourth side plate portion 4a 4. The driving mechanism MK can generate a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet group 5, and can move the lens holding member 2 up and down in the optical axis direction.

As shown in fig. 6 (B), the coil 3 is formed by winding a conductive wire around the outer periphery of the lens holding member 2. The coil 3 includes a winding portion 13 formed by winding in a ring shape and an extension portion 33 extending from the winding portion 13 and wound around the holding portion 72. For clarity, the winding portion 13 is not illustrated in fig. 6 (B) in a detailed state of winding the conductive wire material whose surface is covered with the insulating member. The same applies to other drawings illustrating the winding portion 13.

The extension 33 includes: an extended portion 33B connected to an end portion (winding start portion) of the winding portion 13 located on the inner peripheral side of the winding portion 13 on the winding start side of the coil 3; and an extension portion 33A connected to an end portion (winding end portion) of the winding portion 13 located on the outer peripheral side of the winding portion 13 on the winding end side of the coil 3.

Specifically, as shown in fig. 9 (a), the extension 33B includes: a winding portion 33m wound around the second holding portion 72B; a connecting portion 33c extending opposite to the inner bottom surface of the accommodating portion 82 s; and an insertion portion 33k inserted through the notch portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the subject side (Z1 side). Likewise, as shown in fig. 9 (B), the extension 33A includes: a winding portion 33m wound around the first holding portion 72A; a connecting portion 33c extending opposite to the inner bottom surface of the accommodating portion 82 s; and an insertion portion 33k inserted through the notch portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the subject side (Z1 side).

In the present embodiment, the extension portion 33B is wound around the second holding portion 72B 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, that is, before the winding portion 13 is formed. In the example shown in fig. 9 (a), a part of the wire rod constituting the coil 3 is wound three turns around the second holding portion 72B. Thereby, the winding portion 33m is formed in the second holding portion 72B, and a part of the extension portion 33B is held in the second holding portion 72B. However, the wire material constituting the coil 3 may be wound around the outer periphery of the lens holding member 2, and then the extension portion 33B may be wound around the second holding portion 72B.

After the extension portion 33B is wound around the second holding portion 72B, a wire is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 9 (a), the wire extending from the winding portion 33m faces the inner bottom surface of the housing portion 82s, and passes through the opening portion 82z formed by cutting through the wall portion. The wire rod passes through the notch 52k from the lower side of the flange 52 and extends to the upper side of the flange 52. At this time, the portion facing the inner bottom surface of the housing portion 82s constitutes the connection portion 33c of the extension portion 33B, and the portion passing through the notch portion 52k constitutes the insertion portion 33k of the extension portion 33B.

The insertion portion 33k of the extension portion 33B is configured to contact the edge of the flange portion 52 as shown in fig. 9 (a) when extending upward from the lower side of the flange portion 52. Therefore, when a strong impact is applied to the lens driving device 101 due to a fall or the like, the extending portion 33B of the coil 3 is pressed against the edge of the flange portion 52. In the present embodiment, the edge of the flange 52 is configured to be curved. Therefore, the extending portion 33B is less likely to be cut by the edge of the flange portion 52. The edge of the flange 52 that contacts the extension 33A may be curved.

As shown in fig. 5 (B), the winding portion 13 of the coil 3 wound around the outer periphery 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 fixed to the subject side of the flange portion 52 in a state of being sandwiched between the brim portion 12h and the flange portion 52 in a state of being supported from the inside by the coil support portion 12j (see fig. 5 a). Further, since the inner peripheral surface of the winding portion 13 is supported by the coil support portion 12j in an isotropic and well-balanced manner, the winding portion 13 is held by the lens holding member 2 in a state where the central axis of the coil 3 coincides with the central axis of the lens holding member 2. In this way, the lens holding member 2 is configured such that the optical axis JD of the lens body LS held by the lens holding member 2 easily coincides with the central axes of the lens holding member 2 and the coil 3.

When the winding of the wire material around the outer periphery of the lens holding member 2 is completed, the extending portion 33A connected to the end portion of the winding portion 13 on the winding completion side is pulled out from the object side of the flange portion 52 to the image pickup device side of the flange portion 52 through the notch portion 52k as shown in fig. 9 (B). Specifically, the insertion portion 33k passes through the cutout portion 52k, the connection portion 33c passes through the open portion 82z of the levee portion 82 and extends to face the inner bottom surface of the housing portion 82s, and the winding portion 33m is wound around the first holding portion 72A of the lens holding member 2. In the example shown in fig. 9 (B), the extension portion 33A is wound three turns at the first holding portion 72A.

As shown in fig. 9 (B), an opening 82z is formed by cutting a wall portion on the side of the bank portion 82 away from the first holding portion 72A. The connection portion 33c of the extension portion 33A extends through the open portion 82 z. With this configuration, it is possible to avoid interference between the levee 82 and the extending portion 33A, avoid an increase in the gap between the lens holding member 2 and the first lower plate spring 26A in the optical axis direction, and suppress an increase in the size of the lens driving device 101 in the optical axis direction.

Next, the case 4 will be explained. In the present embodiment, the case 4 is manufactured by applying press working and drawing working to a plate material made of a nonmagnetic metal such as austenitic stainless steel. Since the housing 4 is formed of a non-magnetic metal, even when another lens driving device is disposed adjacent to the lens driving device 101 in a portable device of a two-camera type or the like, a magnetic adverse effect is not exerted on a driving mechanism included in the other lens driving device. Specifically, as shown in fig. 2 (a), the housing 4 has a bottomless box-like outer shape defining the housing portion 4 s. The case 4 includes a rectangular cylindrical outer peripheral wall portion 4A and a flat annular top plate portion 4B provided continuously to an upper end (end on the Z1 side) of the outer peripheral wall portion 4A. The outer peripheral wall portion 4A includes four side plate portions (a first side plate portion 4A1 to a fourth side plate portion 4A4) formed in a flat plate shape. The case 4 configured as described above accommodates the coil 3 and the magnet group 5 in the housing portion 4s as shown in fig. 10 (B), and is coupled to the base member 18 as shown in fig. 2 (a) to form a frame together with the base member 18. However, the case 4 may be replaced with a cover made of a magnetic metal such as iron. In this case, the housing 4 functions as a yoke.

Next, the magnet group 5 constituting the drive mechanism MK will be described. The first to fourth magnets 5A to 5D constituting the magnet group 5 each have a substantially rectangular parallelepiped shape as shown in fig. 1, and are arranged to extend in a direction (X-axis direction or Y-axis direction) perpendicular to the optical axis direction. As shown in fig. 10 (B), the first to fourth magnets 5A to 5D are located outside the coil 3 and are arranged along the side plate portion constituting the outer peripheral wall portion 4A of the case 4. The first to fourth magnets 5A to 5D are fixed to the inner surface of the side plate portion of the outer peripheral wall portion 4A with an adhesive. The first to fourth magnets 5A to 5D are arranged such that, for example, the inside thereof is an N pole and the outside thereof is an S pole.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 11 is a diagram illustrating the leaf spring 6. Fig. 11 (a) is a plan view of the upper leaf spring 16, and fig. 11 (B) is a bottom view of the lower leaf spring 26. Fig. 12 is a diagram illustrating an example of a connection state between the second lower leaf spring 26B and the coil 3. Specifically, (a) in fig. 12 is an enlarged view of a portion R3 surrounded by a broken line shown in (a) in fig. 10, and (B) in fig. 12 is an enlarged view of the second lower leaf spring 26B, the coil 3, and the lens holding member 2 when the portion R3 shown in (a) in fig. 10 is viewed from the X2 side. In fig. 12 (a) and 12 (B), the conductive adhesive CA is indicated by a cross line for easy understanding of the description. In particular, in fig. 12 (a), the conductive adhesive CA located between the lens holding member 2 and the second lower leaf spring 26B and not actually visible is indicated by a thin cross line. Fig. 13 is a diagram showing an example of the structure of base member 18 as stationary-side member RG. Specifically, (a) of fig. 13 is a top perspective view of the base member 18 excluding the metal member 7, and (B) of fig. 13 is a top perspective view of the metal member 7 embedded in the base member 18. Fig. 13 (C) is a top perspective view of the base member 18 including the metal member 7, and fig. 13 (D) is a top perspective view of the base member 18 in a state where the first lower leaf spring 26A and the second lower leaf spring 26B are assembled.

The plate spring 6 is made of a metal plate made of a copper alloy as a main material. As shown in fig. 1, the plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the housing 4 (more precisely, the spacer 1); and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18. In a state where the lens holding member 2 and the plate spring 6 (the upper plate spring 16, the first lower plate spring 26A, and the second lower plate spring 26B) are combined, the plate spring 6 supports the lens holding member 2 such that the lens holding member 2 is movable in the optical axis direction (Z-axis direction). The lower plate spring 26 also functions as a power supply member for supplying current to the coil 3. Therefore, the first lower plate spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower plate spring 26B is electrically and mechanically connected to the other end of the coil 3. The spacer 1 is disposed between the upper leaf spring 16 and the housing 4. The spacer 1 is configured to prevent the lens holding member 2 from colliding with the housing 4 when the lens holding member 2 is moved in the Z1 direction. That is, the spacer 1 is arranged to be able to form a space between the lens holding member 2 and the top plate portion 4B of the housing 4. However, if a space can be formed between the lens holding member 2 and the top plate 4B of the housing 4 by another structure or the like, the spacer 1 may be omitted.

As shown in fig. 11 (a), the upper leaf spring 16 includes: two inner portions 16i as first support portions (movable side support portions) having a substantially rectangular ring-like outer shape and fixed to the lens holding member 2; an outer portion 16e serving as a second support portion (fixed-side support portion) fixed to fixed-side member RG; and four resilient arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the outer portion 16e has four corner portions 16b and four frame portions 16r connecting the four corner portions 16 b. The frame portion 16r is sandwiched between the spacer 1 and the magnet group 5 (the first to fourth magnets 5A to 5D) and fixed by an adhesive. The spacer 1, the case 4, and the magnet group 5 function as a fixed-side member RG.

When the upper leaf spring 16 is assembled to the lens driving device 101, the inner portion 16i is placed on the base portion 12d of the lens holding member 2 as shown in fig. 4a (see fig. 5 a). The inner portion 16i is fixed to the lens holding member 2 by an adhesive AD (see fig. 4 a) applied to a recess 12dh formed in the base portion 12 d. As shown in fig. 4a and 4B, the outer portion 16e is in contact with the upper surfaces (surfaces on the Z1 side) of the first to fourth magnets 5A to 5D, and is held and fixed between the spacer 1 (not shown in fig. 4B) and the first to fourth magnets 5A to 5D. The outer portion 16e, which is sandwiched and fixed between the spacer 1 and the first to fourth magnets 5A to 5D, functions as a fixed-side member RG.

As shown in fig. 11 (a), the upper plate spring 16 is formed to be rotationally symmetric twice about the optical axis JD. The upper leaf spring 16 is fixed to the lens holding member 2 at the inner portion 16i, and is fixed to the housing 4 at the outer portion 16e via the spacer 1. Therefore, the upper plate spring 16 can support the lens holding member 2 with good balance.

As shown in fig. 11 (B), the first lower leaf spring 26A and the second lower leaf spring 26B are configured such that their inner shapes are substantially semicircular. The first lower leaf spring 26A and the second lower leaf spring 26B each include: an inner portion 26i 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 fixed-side member RG; and two resilient arm portions 26g located between the inner portion 26i and the outer portion 26 e.

The two elastic arm portions 26g of the first lower leaf spring 26A are the first elastic arm portion 26g1 and the second elastic arm portion 26g 2. The two elastic arm portions 26g of the second lower leaf spring 26B are the third elastic arm portion 26g3 and the fourth elastic arm portion 26g 4.

As shown in fig. 11 (B), the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B include: three inner engaging portions 26c engaged with the projection portions 2t of the lens holding member 2; two coupling portions 26p that connect the three inner joint portions 26 c; and a coil connecting portion 26h opposed to the extending portion 33 of the coil 3. Specifically, the first lower leaf spring 26A has a first coil connecting portion 26hA, and the second lower leaf spring 26B has a second coil connecting portion 26 hB.

When the first lower plate spring 26A and the second lower plate spring 26B are assembled to the lens driving device 101, each of the six protruding portions 2t of the lens holding member 2 shown in fig. 6 (a) is inserted into the circular through hole 26t provided in the inner engagement portion 26c of each of the first lower plate spring 26A and the second lower plate spring 26B shown in fig. 11 (B). The inner joint portion 26c is fixed to the lens holding member 2 as shown in fig. 10 (a), for example, by applying hot caulking or cold caulking to the protruding portion 2 t. Thereby, the inner portions 26i of the first lower plate spring 26A and the second lower plate spring 26B are positioned and fixed to the lens holding member 2.

As shown in fig. 11 (B), the outer portion 26e of the first lower leaf spring 26A includes two fixing portions 26d engaged with the base member 18. The two fastening portions 26d are the first fastening portion 26d1 and the second fastening portion 26d 2. Similarly, as shown in fig. 11 (B), the outer portion 26e of the second lower leaf spring 26B includes two fixing portions 26d engaged with the base member 18. The two fastening portions 26d are the third fastening portion 26d3 and the fourth fastening portion 26d 4. The through-hole 26s provided in the fixing portion 26d of each of the first lower leaf spring 26A and the second lower leaf spring 26B receives the protruding portion 18t provided on the upper surface of the base member 18 (see fig. 13 a). The protruding portion 18t is fixed to the fixing portion 26d by hot caulking or cold caulking. As a result, the outer portions 26e of the first lower leaf spring 26A and the second lower leaf spring 26B are positioned and fixed to the base member 18, as shown in fig. 13 (D).

The first lower plate spring 26A is joined to the lens holding member 2 via three inner joining portions 26c, and is joined to the base member 18 via two fixing portions 26 d. The same applies to the second lower leaf spring 26B. With this configuration, the first lower plate spring 26A and the second lower plate spring 26B can support the lens holding member 2 with good balance in a state where the lens holding member 2 can move in the optical axis direction.

Next, an example of a connection structure between the second lower leaf spring 26B and the coil 3 will be described with reference to fig. 12. The description of the second lower leaf spring 26B applies similarly to the first lower leaf spring 26A.

As shown in fig. 12 a and 12B, the coil connecting portion 26h of the inner portion 26i of the second lower leaf spring 26B is configured to face the bank portion 82 (see fig. 9 a) of the lens holding member 2 when the lens driving device 101 is assembled. That is, as shown in fig. 12 a, the surface of the coil connecting portion 26h on the subject side (Z1 side) faces the concave accommodating portion 82s surrounded by the bank portion 82. As shown in fig. 12 a, the connection portion 33c of the extension portion 33B of the coil 3 extends through between the surface of the inner portion 26i (coil connection portion 26h) of the second lower leaf spring 26B on the subject side (Z1 side) and the surface of the lens holding member 2 on the image pickup device side (Z2 side).

The housing portion 82s is configured to be able to house the conductive adhesive CA that connects the extension portion 33B of the coil 3 and the second lower leaf spring 26B. In the present embodiment, the bank 82 is formed at a position adjacent to the second holding portion 72B, and therefore, a side wall of the second holding portion 72B is preferably used as a part of the bank 82. Therefore, the accommodating portion 82s is provided at a position adjacent to the second holding portion 72B.

When the second lower leaf spring 26B is assembled to the lens holding member 2, as shown in fig. 12B, the second holding portion 72B protrudes downward (in the Z2 direction) from the inner portion 26i so that the distal end (end on the Z2 side) thereof is positioned closer to the image pickup device side (Z2 side) than the inner portion 26i of the second lower leaf spring 26B. The winding portion 33m is also wound around the second holding portion 72B so that a part thereof is positioned on the image pickup device side (Z2 side) of the inner portion 26 i.

The second lower plate spring 26B and the extension portion 33B of the coil 3 are electrically and physically connected to each other by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before the second lower plate spring 26B is attached to the lens holding member 2, the conductive adhesive CA is applied to the housing portion 82s surrounded by the bank portion 82 of the lens holding member 2, and then the second lower plate spring 26B is attached to the lens holding member 2. The protruding portion 2t of the lens holding member 2 is heat-caulked, and the conductive adhesive CA is heat-cured. The process from the step of applying the conductive adhesive CA to the housing portion 82s to the step of thermally curing the conductive adhesive CA is typically performed in a state where the lens holding member 2 is arranged upside down so that the second holding portion 72B protrudes vertically upward. Therefore, even when the conductive adhesive CA has fluidity, the conductive adhesive CA is appropriately held at a desired position (position in the housing portion 82 s). Since a part of the connection portion 33c is disposed in the housing portion 82s, a part of the connection portion 33c is embedded in the conductive adhesive CA. The conductive adhesive CA is not limited to a thermosetting type, and may be an ultraviolet curing type or a moisture curing type.

Further, the second lower plate spring 26B and the extension portion 33B of the coil 3 may be electrically and physically connected not by the conductive adhesive CA but by soldering. In this case, solder may be disposed on the Z2 side of the second lower leaf spring 26B, and the second lower leaf spring 26B and the extension 33B may be electrically and physically connected.

Next, the fixed-side member RG will be described. The fixed-side member RG includes: a spacer 1 to which the upper plate spring 16 is fixed, a housing 4, and a magnet group 5; and a base member 18 to which the first lower plate spring 26A and the second lower plate spring 26B are fixed, respectively.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, as shown in fig. 13 (a), the base member 18 is a member having a rectangular plate-like outer shape, and a circular opening 18k is formed in the center. Four protruding portions 18t (first protruding portion 18t1 to fourth protruding portion 18t4) each protruding upward are provided on the surface (upper surface) of the base member 18 on the subject side (Z1 side). The protruding portion 18t is inserted through a through hole 26s provided in the fixing portion 26d of each of the first lower leaf spring 26A and the second lower leaf spring 26B (see fig. 11B). At this time, the projecting portion 18t is fixed to the fixing portion 26d by thermal caulking. In fig. 13 (a), 13 (C), and 13 (D), the projection portion 18t is illustrated in a state where the tip end after the heat caulking is deformed. The same applies to other drawings illustrating the projection portion 18 t. The protruding portion 18t may be fixed to the fixing portion 26d by cold caulking.

As shown in fig. 13 a, the base member 18 is configured to have four side portions 18s (a first side portion 18s1 to a fourth side portion 18s4) arranged so as to surround the opening 18 k. Specifically, the first side 18s1 and the second side 18s2 are configured to extend substantially parallel to the Y axis, and the third side 18s3 and the fourth side 18s4 are configured to extend substantially parallel to the X axis. That is, the extending direction of each of the first side 18s1 and the second side 18s2 is configured to intersect the extending direction of each of the third side 18s3 and the fourth side 18s 4.

The metal member 7 shown in fig. 13 (B) is injection-molded and embedded in the base member 18, and the metal member 7 is formed 8 from a metal plate containing a material such as copper, iron, or an alloy containing both of them as a main component. The metal member 7 includes a first metal member 7A and a second metal member 7B that are electrically insulated from each other.

As shown in fig. 13C, the first metal member 7A is configured such that a part of the first metal member 7A is exposed as the plate spring connecting portion 7AP to the upper surface (surface on the Z1 side) of the base member 18. Similarly, as shown in fig. 13C, the second metal member 7B is configured such that a part of the plate spring connecting portion 7BP of the second metal member 7B is exposed to the upper surface (surface on the Z1 side) of the base member 18. In the present embodiment, the leaf spring attachment portion 7AP includes the first leaf spring attachment portion 7AP1 and the second leaf spring attachment portion 7AP 2.

A connection portion 7AJ (see fig. 13B) for connecting the first leaf spring connection portion 7AP1 and the second leaf spring connection portion 7AP2 in the first metal member 7A is embedded in the first side portion 18s1 of the base member 18. The second side portion 18s2 includes a portion in which the metal member 7 is not embedded, and the portion includes a trace portion 18m in which a trace of a gate used when the base member 18 is injection-molded from a synthetic resin material remains.

As shown in fig. 13 (C) and 13 (D), the first metal member 7A is electrically and mechanically connected to the first lower leaf spring 26A by welding at the first leaf spring connection portion 7AP1 and the second leaf spring connection portion 7AP2, respectively. Likewise, the second metal member 7B is electrically and mechanically connected to the second lower leaf spring 26B at the leaf spring connecting portion 7BP by welding. The welding is for example effected by laser welding.

Fig. 13D shows a state in which the first leaf spring connection portion 7AP1 and the first fixing portion 26D1 are joined by the weld metal LW1 at the through hole 26v (see fig. 11B) formed in the first fixing portion 26D 1. Similarly, fig. 13D shows a state in which the second leaf spring connection portion 7AP2 and the second fixing portion 26D2 are joined by the weld metal LW2 at the through hole 26v (see fig. 11B) formed in the second fixing portion 26D2, and the leaf spring connection portion 7BP and the third fixing portion 26D3 are joined by the weld metal LW3 at the through hole 26v (see fig. 11B) formed in the third fixing portion 26D 3.

The first lower leaf spring 26A is electrically and mechanically connected to one end of the coil 3 at the first coil connection portion 26hA, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3 at the second coil connection portion 26 hB. Therefore, the coil 3 can receive the supply of current through the metal member 7 and the lower plate spring 26.

The first metal member 7A is electrically and mechanically connected to a substrate (not shown) on which an image pickup device is mounted via an external terminal portion 7AT extending downward (Z2 direction) from an end portion on the front surface side (Y2 side) of the base member 18. Similarly, the second metal member 7B is electrically and mechanically connected to a substrate (not shown) on which an image pickup device is mounted via an external terminal portion 7BT extending downward (Z2 direction) from an end portion on the front surface side (Y2 side) of the base member 18.

As shown in fig. 2 (a), the base member 18 is positioned between the inner surface of the lower end portion of the outer peripheral wall portion 4A of the housing 4 and the outer peripheral side surface of the base member 18, and then fixed to the housing 4 with an adhesive.

Next, the current supplied to the coil 3 will be described with reference to fig. 14. Fig. 14 is a top perspective view of the metal member 7, the lower leaf spring 26, and the coil 3. Fig. 14 shows a case where a current flows from the external terminal portion 7AT of the first metal member 7A to the extended portion 33A of the coil 3 and a current flows from the extended portion 33B of the coil 3 to the external terminal portion 7BT of the second metal member 7B. The following description is also applicable to the case where a current flows from the external terminal portion 7BT of the second metal member 7B to the extension portion 33B of the coil 3 and a current flows from the extension portion 33A of the coil 3 to the external terminal portion 7AT of the first metal member 7A.

The first fixing portion 26d1 of the first lower leaf spring 26A is joined to the first leaf spring connecting portion 7AP1 of the first metal member 7A at the through hole 26v by welding. A broken line DL1 indicates that the first fixing portion 26d1 is engaged with the first leaf spring connection portion 7AP 1. The second fixing portion 26d2 of the first lower leaf spring 26A is joined to the second leaf spring connecting portion 7AP2 of the first metal member 7A by welding at the through hole 26 v. A broken line DL2 indicates that the second fixing portion 26d2 is engaged with the second leaf spring connection portion 7AP 2. Similarly, the third fixing portion 26d3 of the second lower leaf spring 26B is joined to the leaf spring connecting portion 7BP of the second metal member 7B by welding at the through hole 26 v. The broken line DL3 indicates that the third fixing portion 26d3 is engaged with the leaf spring connecting portion 7 BP. The fourth fixing portion 26d4 of the second lower leaf spring 26B is connected only to the base member 18 and is not joined to the metal member 7.

The extension portion 33A of the coil 3 is connected to the first coil connecting portion 26hA of the first lower leaf spring 26A by the conductive adhesive CA. The broken line DL4 indicates that the extension portion 33A is connected to the first coil connecting portion 26 hA. Similarly, the extension portion 33B of the coil 3 is connected to the second coil connecting portion 26hB of the second lower leaf spring 26B by the conductive adhesive CA. Broken line DL5 indicates that extension 33B is connected to second coil connection portion 26 hB.

The current flowing from external terminal portion 7AT of first metal member 7A to extension 33A of coil 3 passes through two conductive paths CP (first conductive path CP1 and second conductive path CP2) connected in parallel between first plate spring connection portion 7AP1 and first coil connection portion 26 hA. The first conductive path CP1 is a part of a conductive path that reaches the extending portion 33A through the external terminal portion 7AT, the first leaf spring connecting portion 7AP1, the first fixing portion 26d1, the first elastic arm portion 26g1, and the first coil connecting portion 26hA of the inner portion 16i as indicated by the solid-line arrow. The second conductive path CP2 is a part of a conductive path that reaches the extension portion 33A through the external terminal portion 7AT, the first leaf spring connecting portion 7AP1, the coupling portion 7AJ, the second leaf spring connecting portion 7AP2, the second fixing portion 26d2, the second elastic arm portion 26g2, and the first coil connecting portion 26hA of the inner portion 16i, as indicated by an arrow with a one-dot chain line.

The current flowing from the extension portion 33B of the coil 3 to the external terminal portion 7BT of the second metal member 7B passes through the third conductive path CP 3. The third conductive path CP3 is a conductive path that passes through the extension portion 33B, the second coil connecting portion 26hB, the third elastic arm portion 26g3, the third fixing portion 26d3, and the leaf spring connecting portion 7BP of the inner portion 16i to reach the external terminal portion 7BT as indicated by an arrow of a two-dot chain line.

Next, the stopper ST for restricting the movement of the lens holding member 2 will be described with reference to fig. 15 to 17. Fig. 15 is a top perspective view of the lens holding member 2 and the base member 18. Fig. 15 shows a state in which the lens holding member 2 is separated from the base member 18 upward (Z1 direction) for clarity. Fig. 16 shows a positional relationship among the lens holding member 2, the lower leaf spring 26, and the base member 18 when the lens driving device 101 is in the initial state. The initial state means, for example, a state in which the optical axis direction coincides with the vertical direction and a state in which no current is supplied to the coil 3. Specifically, (a) of fig. 16 is a plan view of the lens holding member 2, the lower plate spring 26, and the base member 18. In fig. 16 (a), for clarity, the lower plate spring 26 is shown in a dot pattern, and the lens holding member 2 is shown in a cross-line pattern. Fig. 16 (B) shows a cross section of the lens holding member 2, the lower leaf spring 26, and the base member 18 in the YZ plane including the one-dot chain line L1 in fig. 16 (a). Fig. 17 is a top perspective view of the base member 18. Specifically, (a) of fig. 17 is a top oblique view of the entire base member 18. Fig. 17 (B) is an enlarged view of a portion R4 surrounded by a broken line in fig. 17 (a).

The stopper ST is configured to be able to restrict the movement of the lens holding member 2. In the present embodiment, the stopper ST is configured to be able to mainly restrict the downward (Z2 direction) parallel movement of the lens holding member 2 and the rotation of the lens holding member 2 around the optical axis JD.

Specifically, as shown in fig. 15, the stopper ST includes a convex portion 18P and a concave portion 18U formed in the base member 18 and a protruding portion 2P formed in the lens holding member 2.

More specifically, the stopper ST includes a first stopper ST1 and a second stopper ST 2. The first stopper ST1 includes a first convex portion 18P1 and a first concave portion 18U1 formed in the first side portion 18s1 of the base member 18, and a first protruding portion 2P1 formed in the lens holding member 2. Similarly, the second stopper ST2 includes the second protrusion 18P2 and the second recess 18U2 formed in the second side portion 18s2 of the base member 18, and the second protrusion 2P2 formed in the lens holding member 2.

The broken line in fig. 15 indicates the correspondence between the protrusion 2P and the recess 18U constituting the stopper ST. Specifically, the broken line in fig. 15 indicates that, in the initial state, the first protruding portion 2P1 constituting the first stopper portion ST1 corresponds to the first recess 18U1, and the second protruding portion 2P2 constituting the second stopper portion ST2 corresponds to the second recess 18U 2.

The recess 18U is a depression formed on the upper surface of the base member 18, and includes first to fourth recesses 18U1 to 18U 4. The first recess 18U1 is a depression formed in the first side portion 18s1 and is configured to receive the first protrusion 2P 1. The second recess 18U2 is a depression formed in the second side portion 18s2, and is configured to receive the second protrusion 2P 2. The third recessed portion 18U3 is a recess formed in the first side portion 18s1, and is configured to receive the first holding portion 72A. The fourth recessed portion 18U4 is a recess formed in the second side portion 18s2, and is configured to receive the second holding portion 72B.

In the present embodiment, the first projecting portion 2P1 constituting the first stopper portion ST1 is configured to contact the inner bottom surface of the first recessed portion 18U1 in the initial state, as shown in fig. 16. That is, the inner bottom surface of the first recess 18U1 is a contact surface that contacts the first protrusion 2P1, and restricts the downward movement of the lens holding member 2. The same applies to the second projecting portion 2P2 constituting the second stopper portion ST 2. However, it may be: in the initial state, a gap is formed between the first protruding portion 2P1 and the inner bottom surface of the first recess 18U 1. Namely, it may be: in the initial state, the lens holding member 2 is separated from the base member 18. On the other hand, the first holding portion 72A is configured not to contact the inner bottom surface of the third recessed portion 18U3 in the initial state. That is, in the present embodiment, the combination of the first holding portion 72A and the third recessed portion 18U3 is configured not to function as a stopper portion. However, the first holding portion 72A may be configured to contact the inner bottom surface of the third recessed portion 18U3 in the initial state. That is, the combination of the first holding portion 72A and the third recessed portion 18U3 may be configured to function as a stopper portion. The same applies to the second holding portion 72B.

As shown in fig. 16 (B), the height of the lower end surface of the first projecting portion 2P1 in the initial state, that is, the height of the inner bottom surface of the first recessed portion 18U1 is configured to be lower than the height of the upper end surfaces of the first fixing portion 26d1 and the second fixing portion 26d2 of the first lower leaf spring 26A by a height H1. This structure is realized by disposing the first projecting portion 2P1 so as not to overlap the first lower leaf spring 26A in the Z-axis direction. The same applies to the second projecting portion 2P 2. Further, a rectangle RT1 indicated by a broken line in fig. 11 (B) indicates the position of the lower end surface of the first protrusion 2P1 in the initial state, and a rectangle RT2 indicated by a broken line in fig. 11 (B) indicates the position of the lower end surface of the second protrusion 2P2 in the initial state. As shown in fig. 16 (B), the height of the lower end surface of the first holding portion 72A is lower than the height of the upper end surfaces of the first and second fixing portions 26d1 and 26d2 of the first lower leaf spring 26A.

As shown in fig. 15, the convex portion 18P constituting the stopper portion ST is formed adjacent to the concave portion 18U. In the present embodiment, the first convex portion 18P1 constituting the first stopper portion ST1 is formed on the Y2 side of the first concave portion 18U1, and the second convex portion 18P2 constituting the second stopper portion ST2 is formed on the Y2 side of the second concave portion 18U 2.

In the present embodiment, as shown in fig. 17 (B), the first convex portion 18P1 is configured to: the side surface SF1 (the surface indicated by the thick dot pattern) on the Y1 side is flush with the one side surface SF2 (the surface indicated by the thin dot pattern) constituting the wall portion of the first recess 18U1, and faces the side surface on the Y2 side of the first protrusion 2P1 of the lens holding member 2 in the initial state.

With this configuration, when the lens holding member 2 is positioned at a relatively low position, as shown by an arrow AR1 in fig. 16 (a), when the lens holding member 2 rotates clockwise about the optical axis JD, the side surface of the first protrusion 2P1 on the Y2 side comes into contact with both the side surface SF1 of the first protrusion 18P1 on the Y1 side and the side surface SF2 of the first recess 18U1 on the Y2 side. When the lens holding member 2 is positioned at a relatively high position, as shown by an arrow AR1 in fig. 16 (a), when the lens holding member 2 rotates clockwise about the optical axis JD, the side surface of the first protrusion 2P1 on the Y2 side does not contact the side surface SF2 of the first recess 18U1 on the Y2 side, but only the side surface SF1 of the first projection 18P1 on the Y1 side. Therefore, the clockwise rotation of the lens holding member 2 is restricted regardless of the height of the position of the lens holding member 2 in the optical axis direction (Z-axis direction).

Similarly, when the lens holding member 2 is positioned at a relatively low position, as shown by an arrow AR2 in fig. 16 (a), when the lens holding member 2 rotates counterclockwise about the optical axis JD, the side surface of the second protrusion 2P2 on the Y2 side comes into contact with both the side surface of the second protrusion 18P2 on the Y1 side and the side surface of the second recess 18U2 on the Y2 side. When the lens holding member 2 is positioned at a relatively high position, as shown by an arrow AR2 in fig. 16 (a), when the lens holding member 2 is rotated counterclockwise about the optical axis JD, the side surface of the second protrusion 2P2 on the Y2 side does not contact the side surface of the second recess 18U2 on the Y2 side, but only contacts the side surface of the second protrusion 18P2 on the Y1 side. Therefore, the counterclockwise rotation of the lens holding member 2 is restricted regardless of the height of the position of the lens holding member 2 in the optical axis direction (Z-axis direction).

In this way, the convex portion 18P and the concave portion 18U formed in the base member 18 function as a part of a rotation restricting portion that restricts rotation of the lens holding member 2 about the optical axis JD. In the present embodiment, the concave portion 18U formed in the base member 18 functions as a part of a translation regulating portion that regulates the translation of the lens holding member 2 in the X-axis direction and the translation of the lens holding member 2 in the Y-axis direction. The convex portions 18P and the concave portions 18U function as a part of a translation regulating portion that regulates translation of the lens holding member 2 in the Y2 direction.

As described above, the lens driving device 101 according to the embodiment of the present invention includes: a lens holding member 2 capable of holding a lens body LS; a coil 3 provided on the lens holding member 2; magnets (first magnet 5A to fourth magnet 5D) facing coil 3; a base member 18 which is disposed below the lens holding member 2 on the image pickup device side and in which the metal member 7 is embedded; and a plate spring 6 as a support member provided so as to connect the lens holding member 2 to the base member 18 and supporting the lens holding member 2 movably in the optical axis direction. The plate spring 6 has a first lower plate spring 26A as a first plate spring connected to one end of the coil 3 and a second lower plate spring 26B as a second plate spring connected to the other end of the coil 3. The first lower leaf spring 26A and the second lower leaf spring 26B each have: an outer portion 26e serving as a fixed side support portion fixed to the base member 18; an inner portion 26i as a movable side support portion fixed to the lens holding member 2; an elastic arm portion 26g provided between the outer portion 26e and the inner portion 16 i; and a coil connecting portion 26h connected to the coil 3.

As shown in fig. 13 (B) and 13 (C), the metal member 7 includes: a first metal member 7A having an external terminal portion 7AT exposed to the outside from the base member 18 and a plate spring connecting portion 7AP to which an outer portion 26e of the first lower plate spring 26A is connected; and a second metal member 7B having an external terminal portion 7BT exposed to the outside from the base member 18 and a leaf spring connecting portion 7BP to which an outer portion 26e of the second lower leaf spring 26B is connected.

The lens driving device 101 is configured to supply a current to the coil 3 through the first metal member 7A, the second metal member 7B, the first lower plate spring 26A, and the second lower plate spring 26B.

As shown in fig. 14, the outer portion 26e of the first lower leaf spring 26A has a first fixing portion 26d1 and a second fixing portion 26d2 fixed to positions of the base member 18 that are separated from each other, and the elastic arm portion 26g of the first lower leaf spring 26A has a first elastic arm portion 26g1 connected to the first fixing portion 26d1 and a second elastic arm portion 26g2 connected to the second fixing portion 26d 2.

The leaf spring connection portion 7AP of the first metal member 7A has a first leaf spring connection portion 7AP1 and a second leaf spring connection portion 7AP2 that are connected to each other via a connection portion 7 AJ. The first fixing portion 26d1 of the first lower leaf spring 26A is connected to the first leaf spring connector 7AP1, and the second fixing portion 26d2 of the first lower leaf spring 26A is connected to the second leaf spring connector 7AP 2.

As shown in fig. 14, two conductive paths CP arranged in parallel are formed between the external terminal portion 7AT of the first metal member 7A and the first coil connection portion 26hA of the first lower leaf spring 26A. The two conductive paths CP arranged in parallel are a first conductive path CP1 indicated by an arrow of a solid line and a second conductive path CP2 indicated by an arrow of a one-dot chain line.

With this configuration, the lens driving device 101 can reduce the on-resistance when a current is caused to flow to the coil 3.

In the first lower leaf spring 26A, the first fixing portion 26d1 may be configured to be connected to the second fixing portion 26d2 only via the first resilient arm portion 26g1, the inner portion 26i, and the second resilient arm portion 26g 2. That is, the first fixing portion 26d1 may be configured not to be connected to the second fixing portion 26d2 by a portion like the frame portion 16r of the upper leaf spring 16.

With this configuration, the lens driving device 101 is reduced in size by the amount that at least the frame portion 16r is omitted from the first lower leaf spring 26A. In the lens driving device 101, since the second conduction path CP2 is secured in addition to the first conduction path CP1 by the connection portion 7AJ of the first metal member 7A, even when a portion such as the frame portion 16r is omitted from the first rocker spring 26A, the on-resistance when a current is caused to flow to the coil 3 can be suppressed from increasing.

A stopper ST for restricting the movement of the lens holding member 2 may be provided between the first fixing portion 26d1 and the second fixing portion 26d 2. Specifically, as shown in fig. 15, a stopper ST for restricting the movement of the lens holding member 2 may be provided in a space between the first projection 18t1 to which the first fixing portion 26d1 is attached and the second projection 18t2 to which the second fixing portion 26d2 is attached. This structure is realized by omitting the portion of the frame portion 16r from the first rocker spring 26A. This is because, when the first fixing portion 26d1 and the second fixing portion 26d2 are connected by a connecting portion such as the frame portion 16r, the stopper ST cannot be provided in the space between the first fixing portion 26d1 and the second fixing portion 26d 2. Because the stopper portion ST interferes with the coupling portion in a case where the stopper portion ST is assumed to be provided.

With this configuration, the lens driving device 101 can improve the space efficiency in the housing 4, and further downsizing of the lens driving device 101 can be achieved.

As shown in fig. 15, the stopper ST may have a first stopper ST1 and a second stopper ST 2. In the example shown in fig. 15, the first stopper ST1 includes: a first recess 18U1 as an abutting portion formed on the upper surface of the base member 18; and a first protrusion 2P1 protruding from the lens holding member 2 toward the first recess 18U 1. As shown in fig. 16 (B), the tip of the first protrusion 2P1 is located at a position lower than the upper surfaces of the first securing portion 26d1 and the second securing portion 26d2 by a height H1 in the optical axis direction. The first stopper ST1 is configured to restrict the downward movement of the lens holding member 2 by the first recess 18U1 and the first protrusion 2P 1. The same applies to the second stopper ST 2.

In this way, the stopper ST is arranged so as not to interfere with the lower leaf spring 26, and therefore, the size thereof can be increased. That is, the stopper portion ST can be formed so that the contact area when the protrusion portion 2P formed on the lens holding member 2 contacts the recess portion 18U formed on the base member 18 is increased. Therefore, the stopper ST can reliably restrict the downward translation of the lens holding member 2.

The base member 18 may be provided with a recess 18U and an upwardly projecting projection 18P adjacent to the recess 18U on the upper surface thereof. That is, the stopper ST may include the convex portion 18P as a component. Specifically, as shown in fig. 15, the base member 18 may be provided with a first protrusion 18P1 protruding upward. In this case, the inner bottom surface of the first recess 18U1 may constitute an abutting portion that abuts against the first protruding portion 2P 1. As shown in fig. 17 (B), the first stopper ST1 may be configured to: one side surface SF1 (a surface indicated by a thick dot pattern) of the first convex portion 18P1 and one side surface SF2 (a surface indicated by a thin dot pattern) of the wall portion constituting the first concave portion 18U1 form the same plane, and face the first protruding portion 2P1 of the lens holding member 2. In this configuration, the first stopper ST1 can reliably restrict the movement of the lens holding member 2 rotating around the optical axis JD by the first concave portion 18U1, the first convex portion 18P1, and the first protruding portion 2P 1. The same applies to the second stopper ST 2.

With this configuration, even when the lens holding member 2 moves upward and rotates about the optical axis JD due to an impact such as a drop, the stopper ST can suppress the rotation of the lens holding member 2 about the optical axis JD.

As shown in fig. 16B, a first holding portion 72A that projects downward (in the Z2 direction) from the lower surface (surface on the Z2 side) of the lens holding member 2 and holds the extending portion 33A that is one end of the coil 3 may be provided between the first fixing portion 26d1 and the second fixing portion 26d 2. In this case, the distal end of the first holding portion 72A is located at a position lower than the upper surfaces of the first fixing portion 26d1 and the second fixing portion 26d2 in the optical axis direction. The same applies to the second holding portion 72B.

With this configuration, the lens holding member 2 can appropriately hold the extended portion 33 of the coil 3 while ensuring the protruding amount of the holding portion 72. The lens holding member 2 may be configured such that the holding portion 72 has the same function as the protruding portion 2P, that is, a function as a stopper portion for restricting downward translation of the lens holding member 2.

As shown in fig. 13 (a), the base member 18 may have an opening 18k at the center, and a first side 18s1, a second side 18s2, a third side 18s3, and a fourth side 18s4 arranged so as to surround the opening 18 k.

In this case, the extending direction of each of the first side 18s1 and the second side 18s2 may intersect the extending direction of each of the third side 18s3 and the fourth side 18s 4.

Further, a coupling portion 7AJ that couples the first leaf spring connection portion 7AP1 and the second leaf spring connection portion 7AP2 in the first metal member 7A may be embedded in the first side portion 18s 1.

The second side portion 18s2 may include a portion in which the metal member 7 is not embedded, and the portion may include a trace portion 18m in which a trace of a gate used when the base member 18 is molded from a synthetic resin material remains.

As shown in fig. 13 (D), the outer portion 26e of the second lower leaf spring 26B may have a third fixing portion 26D3 and a fourth fixing portion 26D4 fixed to the base member 18 and facing each other with the trace 18m interposed therebetween.

In this case, it may be: only the third fixing portion 26d3 of the second lower leaf spring 26B is connected to the leaf spring connecting portion 7BP of the second metal member 7B. That is, the fourth fixing portion 26d4 of the second lower leaf spring 26B may not be connected to the second metal member 7B.

This configuration can prevent the metal member 7 from being displaced during the molding process. This is because the metal member 7 is not embedded in the portion where the gate is located.

The outer portion 26e of the second lower leaf spring 26B may have a third fixing portion 26d3 and a fourth fixing portion 26d4 fixed at positions separated from each other in the base member 18.

In this case, the elastic arm portion 26g of the second lower leaf spring 26B may have a third elastic arm portion 26g3 connected to the third fixing portion 26d3 and a fourth elastic arm portion 26g4 connected to the fourth fixing portion 26d4, as shown in fig. 14.

In the example shown in fig. 14, the second metal member 7B does not have a leaf spring connection portion corresponding to the fourth fixing portion 26d4 of the second lower leaf spring 26B. However, the second metal member 7B may have a leaf spring connecting portion corresponding to the fourth fixing portion 26d4 of the second lower leaf spring 26B.

Specifically, the leaf spring connection portion 7BP of the second metal member 7B may have a third leaf spring connection portion and a fourth leaf spring connection portion that are coupled to each other via a coupling portion.

In this case, it may be: the third fixing portion 26d3 of the second lower leaf spring 26B is connected to the third leaf spring connecting portion, and the fourth fixing portion 26d4 of the second lower leaf spring 26B is connected to the fourth leaf spring connecting portion. Further, two conductive paths may be arranged between the external terminal portion 7BT of the second metal member 7B and the second coil connecting portion 26hB of the second lower leaf spring 26B, similarly to the two conductive paths CP arranged between the external terminal portion 7AT of the first metal member 7A and the first coil connecting portion 26hA of the first lower leaf spring 26A. In the example shown in fig. 14, only the third conductive path CP3 indicated by the two-dot chain line arrow is formed between the external terminal portion 7BT of the second metal member 7B and the second coil connecting portion 26hB of the second lower leaf spring 26B.

The configuration in which two conductive paths are also arranged between the external terminal portion 7BT of the second metal member 7B and the second coil connecting portion 26hB of the second lower leaf spring 26B can further reduce the on-resistance when a current is caused to flow to the coil 3.

The first plate spring connecting portion 7AP1 of the first metal member 7A and the first fixing portion 26d1 of the first lower leaf spring 26A may be connected by welding, and the second plate spring connecting portion 7AP2 of the first metal member 7A and the second fixing portion 26d2 of the first lower leaf spring 26A may be connected by welding. Further, the plate spring connecting portion 7BP of the second metal member 7B and the third fixing portion 26d3 of the second lower plate spring 26B may be connected by welding.

This configuration can reduce the manufacturing cost of the lens driving device 101. The first metal member 7A and the second metal member 7B may be made of, for example, stainless steel.

The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above embodiment. The above embodiments can be applied to various modifications and substitutions without departing from the scope of the present invention. The features described with reference to the above embodiments can be combined as appropriate as long as they are not technically contradictory.

For example, in the above embodiment, the magnet group 5 includes four magnets (the first magnet 5A to the fourth magnet 5D) along each of the first side plate portion 4a1 to the fourth side plate portion 4a 4. However, two magnet groups 5 may be arranged along each of the first side plate portion 4a1 and the third side plate portion 4A3, or two magnet groups 5 may be arranged along each of the second side plate portion 4a2 and the fourth side plate portion 4a 4.

In the above embodiment, the recess 18U formed in the base member 18 is configured such that the entire periphery of the recess 18U is surrounded by a wall. However, the recess 18U may omit the inner (side closer to the optical axis JD) wall. That is, the recess 18U may be configured such that three sides of the recess 18U are surrounded by walls. Specifically, the inner walls of the first recess 18U1 and the second recess 18U2 may be omitted. This is because, even in the case where the lens holding member 2 moves so that the first projecting portion 2P1 faces the inside (X2 side), the movement is restricted by the side surface of the outside (X2 side) of the second projecting portion 2P2 coming into contact with the wall of the outside (X2 side) of the second recessed portion. In addition, the omission simplifies the shape of the base member 18.

Claims

1. A lens driving device is provided with:

a lens holding member capable of holding a lens body;

a coil provided on the lens holding member;

a magnet facing the coil;

a base member which is disposed below the lens holding member and in which a metal member is embedded; and

a support member configured to connect the lens holding member to the base member and to support the lens holding member so as to be movable in an optical axis direction,

the support member has a first plate spring connected to one end of the coil and a second plate spring connected to the other end of the coil,

the first plate spring and the second plate spring each have: a fixed side support part fixed to the base member; a movable side support part fixed to the lens holding member; an elastic arm portion provided between the fixed-side support portion and the movable-side support portion; and a coil connecting portion connected to the coil,

the metal member includes: a first metal member including an external terminal portion exposed to the outside from the base member and a plate spring connecting portion to which the fixed-side supporting portion of the first plate spring is connected; and a second metal member having an external terminal portion exposed to the outside from the base member and a plate spring connecting portion to which the fixed-side supporting portion of the second plate spring is connected,

the lens driving device supplies a current to the coil via the first metal member, the second metal member, the first plate spring, and the second plate spring,

the above-described lens driving device is characterized in that,

the fixed-side support portion of the first plate spring has a first fixed portion and a second fixed portion fixed to positions separated from each other of the base member, the elastic arm portion of the first plate spring has a first elastic arm portion connected to the first fixed portion and a second elastic arm portion connected to the second fixed portion,

the plate spring connecting portion of the first metal member includes a first plate spring connecting portion and a second plate spring connecting portion connected to each other via a connecting portion,

the first fixing portion of the first plate spring is connected to the first plate spring connecting portion,

the second fixing portion of the first plate spring is connected to the second plate spring connecting portion,

two conductive paths are formed between the external terminal portion of the first metal member and the coil connecting portion of the first plate spring.

2. The lens driving device according to claim 1,

in the first leaf spring, the first fixed portion is connected to the second fixed portion only through the first elastic arm portion, the movable-side support portion, and the second elastic arm portion.

3. The lens driving device according to claim 2,

a stopper portion for restricting the movement of the lens holding member is provided between the first fixing portion and the second fixing portion.

4. The lens driving device according to claim 3,

the above-mentioned spacing portion has: an abutting part formed on an upper surface of the base member; and a protruding portion protruding from the lens holding member toward the contact portion,

the tip of the protruding portion is located lower than the upper surfaces of the first fixing portion and the second fixing portion in the optical axis direction,

the contact portion and the protruding portion restrict downward movement of the lens holding member.

5. The lens driving device according to claim 4,

a concave portion and an upwardly protruding convex portion adjacent to the concave portion are provided on the upper surface of the base member,

the inner bottom surface of the recess constitutes the contact portion,

the side surface of the convex portion and the side surface of the wall portion constituting the concave portion are flush with each other and face the protruding portion of the lens holding member,

the movement of the lens holding member around the optical axis is restricted by the concave portion, the convex portion, and the protruding portion.

6. The lens driving device according to any one of claims 1 to 5,

a holding portion that protrudes downward from a lower surface of the lens holding member and holds one end portion of the coil is provided between the first fixing portion and the second fixing portion, and a tip end of the holding portion is located at a position lower than upper surfaces of the first fixing portion and the second fixing portion in the optical axis direction.

7. The lens driving device according to any one of claims 1 to 6,

the base member has an opening at the center thereof, and has a first side, a second side, a third side, and a fourth side arranged so as to surround the opening,

the extending direction of each of the first side portion and the second side portion intersects with the extending direction of each of the third side portion and the fourth side portion,

a connecting portion that connects the first plate spring connecting portion and the second plate spring connecting portion of the first metal member is embedded in the first side portion,

the second edge portion includes a portion in which the metal member is not embedded, and a gate portion in which a gate is left as a gate mark used when the base member is molded with a synthetic resin material,

the fixed-side support portion of the second plate spring has a third fixed portion and a fourth fixed portion fixed to the base member and opposed to each other with the trace portion interposed therebetween,

only the third fixing portion of the second plate spring is connected to the plate spring connecting portion of the second metal member.

8. The lens driving device according to any one of claims 1 to 6,

the fixed-side support portion of the second plate spring has a third fixed portion and a fourth fixed portion fixed to positions separated from each other in the base member,

the elastic arm portion of the second plate spring has a third elastic arm portion connected to the third fixing portion and a fourth elastic arm portion connected to the fourth fixing portion,

the plate spring connecting portion of the second metal member has a third plate spring connecting portion and a fourth plate spring connecting portion connected to each other via a connecting portion,

the third fixing portion of the second plate spring is connected to the third plate spring connecting portion,

the fourth fixing portion of the second plate spring is connected to the fourth plate spring connecting portion,

two conductive paths are formed between the external terminal portion of the second metal member and the coil connecting portion of the second plate spring.

9. The lens driving device according to any one of claims 1 to 7,

the first plate spring connecting portion of the first metal member and the first fixing portion of the first plate spring are connected by welding, and the second plate spring connecting portion of the first metal member and the second fixing portion of the first plate spring are connected by welding.

10. A camera module having:

the lens driving device according to any one of claims 1 to 9;

the lens body; and

and an imaging element facing the lens body.