CN114200627B

CN114200627B - Lens driving device and camera module

Info

Publication number: CN114200627B
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: 2024-01-09
Anticipated expiration: 2041-08-26
Also published as: CN114200627A; JP2022038456A

Abstract

The invention provides a lens driving device capable of reducing on-resistance between a terminal and a plate spring. In a lens driving device (101), a coil (3) is supplied with current through a first metal member (7A), a second metal member (7B), a first lower leaf spring (26A), and a second lower leaf spring (26B). The first lower leaf spring (26A) has a first fixing portion (26 d 1), a second fixing portion (26 d 2), a first elastic arm portion (26 g 1), and a second elastic arm portion (26 g 2). The first metal member (7A) has a first leaf spring connection portion (7 AP 1) and a second leaf spring connection portion (7 AP 2) that are connected to each other via a connection portion (7 AJ). The first fixing portion (26 d 1) is connected to the first leaf spring connecting portion (7 AP 1), and the second fixing portion (26 d 2) is connected to the second leaf spring connecting portion (7 AP 2). Two Conductive Paths (CP) are formed between the external terminal portion (7 AT) of the first metal member (7A) and the first coil connection portion (26 hA) of the first lower plate 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 or the like, and a camera module including the lens driving device.

Background

Conventionally, a lens driving device configured to supply a current to a coil mounted on a lens holding member via a leaf spring supporting the lens holding member has been known (see patent document 1).

In this lens driving device, a pair of terminals made of a metal plate embedded in the base member are electrically connected to a pair of lower plate springs. The external power supply voltage of 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 leaf 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 leaf springs.

Prior art literature

Patent literature

Patent document 1: japanese patent application registration No. 3183931

Disclosure of Invention

However, in the above-described 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.

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

The lens driving device according to an embodiment of the present utility model 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 disposed below the lens holding member and having a metal member embedded therein; and a support member that connects the lens holding member to the base member and supports the lens holding member so as to be movable in an optical axis direction, the support member including a first leaf spring connected to one end of the coil and a second leaf spring connected to the other end of the coil, the first leaf spring and the second leaf 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 connection part connected to the coil, wherein the metal member includes: a first metal member including an external terminal portion exposed to the outside from the base member and a leaf spring connecting portion connected to the fixed side supporting portion of the first leaf spring; and a second metal member including an external terminal portion exposed to the outside from the base member and a leaf spring connecting portion connected to the fixed side supporting portion of the second leaf spring, wherein the lens driving device supplies current to the coil via the first metal member, the second metal member, the first leaf spring, and the second leaf spring, wherein the fixed side supporting portion of the first leaf spring includes a first fixed portion and a second fixed portion fixed to positions of the base member that are separated from each other, the elastic arm portion of the first leaf spring includes a first elastic arm portion connected to the first fixed portion and a second elastic arm portion connected to the second fixed portion, the leaf spring connecting portion of the first metal member includes a first leaf spring connecting portion and a second leaf spring connecting portion connected to each other via a connecting portion, the first fixed portion of the first leaf spring is connected to the first leaf spring connecting portion, the second fixed portion of the first leaf spring is connected to the second leaf spring connecting portion, and a path is formed between the two outer side coil connecting portions of the first leaf spring and the first metal member.

Effects of the invention

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 device.

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 spacers have been removed.

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 apparatus in a state where a part of the components is omitted.

Fig. 11 is a top view of the upper leaf spring and a top view of the lower leaf spring.

Fig. 12 is a diagram illustrating an example of connection between a plate 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 leaf 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 protruding portion 2P1 first protruding portion 2P second protruding portion 2t protruding setting portion 3 coil 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 4A housing portion 5A magnet set 5A first magnet 5B third magnet 5D fourth magnet 6 plate spring 7A first metal member 7AJ connecting portion 7AP1 second plate spring connecting portion 7AT second metal member 7AT external terminal portion 7B second metal member 7BP plate spring connecting portion 7BT external terminal portion 12 tubular portion 12D base portion 12dh recess 12h eaves 12j coil support 13 coil 16 upper side plate spring 16B corner 16e outside portion 16g resilient arm 16i inside portion 16r frame portion 18 base member 18k opening 18m trace 18P boss 18P1 first boss 18P2 second boss 18s side 18s1 side 18s2 second side 18s3 third side 18s4 fourth side 18t projection arrangement 18t1 first projection arrangement 18t2 second projection arrangement 18t3 third projection arrangement 18t4 fourth projection arrangement 18U recess 18U1 first recess 18U2 second recess 18U3 third recess 18U4 fourth recess 26 The side leaf spring 26a … … first lower leaf spring 26B 5263 second lower leaf spring 26c … … inner side engaging portion 26d … … fixing portion 26d1 … … first fixing portion 26d2 … … second fixing portion 26d3 … … third fixing portion 26d4 … … fourth fixing portion 26e … … outer side portion 26g … … resilient arm portion 26g1 … … first resilient arm portion 26g2 … … second resilient arm portion 26g3 … … third resilient arm portion 26g4 … … fourth resilient arm portion 26h … … coil connecting portion 26hA … … first coil connecting portion 26hB … … second coil connecting portion 26i … … inner side portion 26p … … connecting portion 26s, 26t, 26v … … through holes 33, 33A 33B … … extension 33c … … connecting portion 33k … … inserting portion 33m … … winding portion 52k … … flange portion 52k … … cutout portion 72 … … holding portion 72a … … first holding portion 72B … … second holding portion 82 … … projecting bank portion 82s … … receiving portion 82u … … inner side wall portion 82v … … outer side wall portion 82w … … opening portion 82z … … opening portion 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 … … fixing side member SF1, SF2 side surface ST … … limiting portion ST1 first limiting portion ST2 … … second limiting portion

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 the 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 seen from the Y2 side. Fig. 3 (a) is a top 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 have been removed, 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 have been removed, as viewed from the Y2 side, and corresponds to fig. 2 (B).

As shown in fig. 1, the lens driving apparatus 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 supporting member that supports the lens holding member 2 so as to be movable in the optical axis direction; and a fixing side member RG for fixing the leaf spring 6. The lens body LS is, for example, a tubular lens barrel including at least one lens, and is configured such that its central axis is along the optical axis direction. The optical axis direction includes a direction of an optical axis JD with respect to 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 opposite to the coil 3. The fixed-side member RG includes a spacer 1, a rectangular box-shaped bottomless case 4 as a cover member, and a 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 for making electrical connection with the outside. As shown in fig. 1, the leaf 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 plate spring 26 includes a first lower plate spring 26A and a second lower plate spring 26B.

As shown in fig. 2 (a), the housing 4 is coupled to the base member 18 to form a frame together with the base member 18. The housing 4 includes a rectangular tubular outer peripheral wall portion 4A and a flat annular top plate portion 4B provided continuously with 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 formed in a flat plate shape. Specifically, as shown in fig. 1, the side plate portion includes 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 face each other perpendicularly to the first side plate portion 4A1 and the third side plate portion 4A3, respectively. Each of the first side plate portion 4A1 and the third side plate portion 4A3 and each of the second side plate portion 4A2 and the fourth side plate 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 image pickup element (not shown) is mounted. The lens driving device 101, the lens body LS mounted on the lens holding member 2, and the image pickup element and the substrate mounted on 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 plate 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 plate spring 26B, the second metal member 7B, and the conductive pattern formed on the substrate. When a current flows in the coil 3, the drive mechanism MK generates electromagnetic force along the optical axis direction.

The lens driving device 101 uses the electromagnetic force to move the lens holding member 2 in the optical axis direction on the Z1 side (subject side) of the image pickup element, 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 achieve macro imaging, and moves the lens holding member 2 in a direction toward the image pickup device to enable infinity imaging.

Next, the lens holder 2 and the driving mechanism MK will be described. Fig. 5 (a) is a top perspective view of the lens holder 2, and fig. 5 (B) is a top perspective view showing a state in which the coil 3 is wound around the lens holder 2 of 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 of 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 which 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 which the lower leaf 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. 5 a, the lens holding member 2 includes a cylindrical portion 12 having a through hole in the optical axis direction, and a flange portion (eave portion) 52 as a first protruding portion formed on the image pickup element side (Z2 side) in the optical axis direction. In the present embodiment, the flange 52 is formed so as to protrude radially outward, that is, in a direction perpendicular to the optical axis direction.

In the present embodiment, a screw groove is provided in the inner peripheral surface of the through hole of the tubular portion 12 so that the lens body LS can be attached. 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. Four base portions 12d are provided on the end surface of the tubular portion 12 on the subject side. Recesses 12dh are formed on the upper surfaces of the four base portions 12d, respectively. As shown in fig. 4 (a), the inner portion 16i of the upper plate 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 serving as an outer wall portion for supporting the coil 3 from the inside is provided on the outer peripheral surface of the tubular portion 12. In the present embodiment, the coil support portion 12j has an octagonal outer shape in a plan view so as to support the coil 3 having an octagonal annular outer shape in a plan view.

On the object side of the coil support 12j, four eaves 12h as second protruding portions are formed, and the eaves 12h protrude radially outward so as to face the flange 52 as the first protruding portion in the optical axis direction. In the present embodiment, the eave 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 on the outer peripheral surface side of the lens holding member 2 so as to be supported by the coil support portion 12j and to be sandwiched between the flange portion 52 and the eave portion 12h in the optical axis direction. The base portion 12d is disposed above the eave portion 12 h.

The flange 52 protrudes radially outward from the outer peripheral surface of the image pickup device side (Z2 side) portion of the cylindrical portion 12. The coil 3 is disposed on the object side of the flange portion 52. As shown in fig. 6 (B), two cutout portions 52k are formed in the flange portion 52 with the optical axis JD of the lens body LS interposed therebetween. The extending portion 33B is inserted into one of the two cutout portions 52k, the extending portion 33B being a portion on the winding start side of the wire rod constituting the coil 3, and the extending portion 33A is inserted into the other of the two cutout portions 52k, the extending portion 33A being a portion on the winding end side of the wire rod constituting the coil 3. The edge of the flange 52 having the notch 52k is curved. This is to prevent the wire in contact with the edge from being cut.

As shown in fig. 6 (a), the flange portion 52 includes: two square convex holding portions 72 protruding downward (Z2 direction) from the imaging element side (Z2 side), two circular convex protruding portions 2t, and two dam portions 82. The two bank portions 82 are formed of three wall portions (an inner wall portion 82u, an outer wall portion 82v, and a side wall portion 82 w), respectively. Specifically, the dam portion 82 is constituted by a step portion formed on the bottom surface of the lens holder 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 around the holding portions 72.

As shown in fig. 6 (a) and 10 (a), the protruding portion 2t includes 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 inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B are attached and fixed to the protruding portion 2t. The fixing of the inner portions 26i of the first lower leaf springs 26A and the second lower leaf springs 26B is achieved by heat staking the protruding portions 2t inserted into the through holes 26t (see fig. 11 (B)) formed in the inner portions 26i. In addition, the hot staking may be cold staking. In fig. 6 (a) and 6 (B), the protruding portion 2t is illustrated in a state in which the tip after heat staking is deformed. The same applies to the other figures.

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

Next, a 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 plate portions (the first side plate portion 4A1 to the fourth side plate portion 4 A4) constituting the case 4, respectively. Specifically, the magnet group 5 includes first to fourth magnets 5A to 5D. The first magnet 5A is disposed so as to face the first side plate portion 4A1, the second magnet 5B is disposed so as to face the second side plate portion 4A2, the third magnet 5C is disposed so as to face the third side plate portion 4A3, and the fourth magnet 5D is disposed so as to face the fourth side plate portion 4 A4. The drive mechanism MK can generate a drive force (thrust force) 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 along 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, fig. 6 (B) omits a detailed view of the wound state of the conductive wire material covered with the insulating member with respect to the winding portion 13. The same applies to other figures showing the winding portion 13.

The extension 33 includes: an extension 33B connected to an end (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 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 portion 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 into the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side). Similarly, 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 into the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 to 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 material 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 extension portion 33B may be wound around the second holding portion 72B after the wire material constituting the coil 3 is wound around the outer periphery of the lens holding member 2.

After the extension portion 33B is wound around the second holding portion 72B, the 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 accommodating portion 82s, and passes through the opening 82z formed by cutting the wall portion. The wire rod extends from the lower side of the flange 52 to the upper side of the flange 52 through the notch 52 k. At this time, the portion facing the inner bottom surface of the accommodating portion 82s constitutes the connecting portion 33c of the extending portion 33B, and the portion passing through the cutout portion 52k constitutes the insertion portion 33k of the extending portion 33B.

When the insertion portion 33k of the extension portion 33B extends upward from the lower side of the flange portion 52, it contacts the edge portion of the flange portion 52 as shown in fig. 9 (a). Therefore, when a strong impact such as a drop is applied to the lens driving device 101, the extension portion 33B of the coil 3 is pressed against the edge portion of the flange portion 52. In the present embodiment, the edge of the flange 52 is curved. Therefore, the extension portion 33B is difficult to be cut by the edge portion of the flange portion 52. The edge portion of the flange portion 52 that contacts the extension portion 33A may be configured to 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 object side of the flange portion 52 in a state of being sandwiched between the flange portion 52 and the flange portion 12h 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 isotropically and well balanced by the coil support portion 12j, 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 rod around the outer periphery of the lens holding member 2 is completed, the extension portion 33A connected to the end portion on the winding completion side of the winding portion 13 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 cutout 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 opening portion 82z of the bank 82 and extends opposite to the inner bottom surface of the accommodation 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 around the first holding portion 72A.

As shown in fig. 9 (B), an opening 82z is formed in the side of the bank 82 away from the first holding portion 72A, the wall of which is cut. The connection portion 33c of the extension portion 33A extends through the opening portion 82z. With this configuration, the interference between the dam portion 82 and the extension portion 33A can be avoided, the increase in the gap between the lens holding member 2 and the first lower leaf spring 26A in the optical axis direction can be avoided, and the increase in the size of the lens driving device 101 in the optical axis direction can be suppressed.

Next, the case 4 will be described. 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 case 4 is formed of a nonmagnetic metal, even when another lens driving device is disposed adjacent to the lens driving device 101 in a dual camera type portable device or the like, the driving mechanism included in the other lens driving device is not adversely affected in terms of magnetism. Specifically, as shown in fig. 2 (a), the housing 4 has a bottomless box-like outer shape defining the storage portion 4 s. The housing 4 includes a rectangular tubular outer peripheral wall portion 4A and a flat annular top plate portion 4B provided continuously with 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 (first side plate portion 4A1 to fourth side plate portion 4A 4) formed in a flat plate shape. The case 4 thus constructed accommodates the coil 3 and the magnet group 5 in the accommodation portion 4s as shown in fig. 10 (B), and is coupled to the base member 18 as shown in fig. 2 (a) to constitute 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 side plate portions constituting the outer peripheral wall portion 4A of the housing 4. The first to fourth magnets 5A to 5D are fixed to the inner surfaces of the side plate portions of the outer peripheral wall portion 4A by an adhesive. The first to fourth magnets 5A to 5D are each arranged such that, for example, the inner side thereof becomes an N pole and the outer side thereof becomes 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 top 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 plate spring 26B and the coil 3. Specifically, fig. 12 (a) is an enlarged view of a portion R3 surrounded by a broken line shown in fig. 10 (a), and fig. 12 (B) 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 fig. 10 (a) is viewed from the X2 side. In fig. 12 (a) and 12 (B), the conductive adhesive CA is indicated by intersecting lines for ease of understanding of the description. In particular, in fig. 12 (a), the practically invisible conductive adhesive CA located between the lens holding member 2 and the second lower plate spring 26B is indicated by thin intersecting lines. Fig. 13 is a diagram showing an exemplary configuration of the base member 18 as the fixed-side member RG. Specifically, fig. 13 (a) is a top perspective view of the base member 18 excluding the metal member 7, and fig. 13 (B) 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 leaf spring 6 is made of a metal plate made of a copper alloy as a main material. As shown in fig. 1, the leaf 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 leaf springs 6 (the upper plate spring 16, the first lower plate spring 26A, and the second lower plate spring 26B) are combined, the leaf springs 6 support the lens holding member 2 so that the lens holding member 2 can move 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 leaf spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3. A spacer 1 is arranged between the upper leaf spring 16 and the housing 4. The spacer 1 is configured to be able 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 configured 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 portion 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 plate spring 16 includes: two inner portions 16i as first supporting portions (movable side supporting portions) having a substantially rectangular annular outer shape and fixed to the lens holding member 2; an outer portion 16e as a second support portion (fixed side support portion) fixed to the fixed side member RG; and four elastic arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the outer side 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 (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, as shown in fig. 4 (a), the inner portion 16i is placed on the base portion 12d of the lens holding member 2 (see fig. 5 (a)). The inner portion 16i is fixed to the lens holder 2 by an adhesive AD (see fig. 4 a) applied to the recess 12dh formed in the base portion 12 d. As shown in fig. 4 a and 4B, the outer portion 16e contacts the upper surfaces (Z1-side surfaces) of the first to fourth magnets 5A to 5D, and is sandwiched between the spacer 1 (not shown in fig. 4B) and the first to fourth magnets 5A to 5D and fixed. The outer portion 16e sandwiched and fixed between the spacer 1 and each of the first to fourth magnets 5A to 5D functions as a fixing-side member RG.

As shown in fig. 11 (a), the upper plate spring 16 is formed to be secondarily rotationally symmetrical about the optical axis JD. The upper plate spring 16 is fixed to the lens holding member 2 at an inner portion 16i and fixed to the housing 4 via the spacer 1 at an outer portion 16 e. 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 each configured to have a substantially semicircular inner shape. 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 as a second support portion (fixed side support portion) fixed to the fixed side member RG; and two elastic 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 a first elastic arm portion 26g1 and a second elastic arm portion 26g2. 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 26g4.

As shown in fig. 11 (B), each of the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B includes: three inner engaging portions 26c engaged with the protruding setting portions 2t of the lens holding member 2; two coupling portions 26p connecting the three inner joint portions 26 c; and a coil connection portion 26h facing the extension 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 26hB.

When the first lower leaf spring 26A and the second lower leaf 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 a circular through hole 26t provided in the inner side joint portion 26c of each of the first lower leaf spring 26A and the second lower leaf 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) by, for example, applying heat caulking or cold caulking to the protruding portion 2 t. Thereby, the respective inner portions 26i of the first and second lower leaf springs 26A and 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 joined to the base member 18. The two fixing portions 26d are first fixing portions 26d1 and second fixing portions 26d2. Similarly, as shown in fig. 11 (B), the outer portion 26e of the second lower leaf spring 26B includes two fixing portions 26d joined to the base member 18. The two fixing portions 26d are third fixing portions 26d3 and fourth fixing portions 26d4. The through holes 26s provided in the fixing portions 26d of the first lower leaf spring 26A and the second lower leaf spring 26B receive the protruding portions 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 heat caulking or cold caulking. Thus, the outer portions 26e of the first and second lower leaf springs 26A and 26B are positioned and fixed to the base member 18 as shown in fig. 13 (D).

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

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

As shown in fig. 12 a and 12B, the coil connection portion 26h of the inner portion 26i of the second lower leaf spring 26B is configured to face the bank 82 of the lens holding member 2 (see fig. 9 a) 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 object side (Z1 side) is opposed to the concave accommodating portion 82s surrounded by the dam portion 82. As shown in fig. 12 a, the connection portion 33c of the extension portion 33B of the coil 3 extends through a space between the object-side (Z1-side) surface of the inner portion 26i (coil connection portion 26 h) of the second lower plate spring 26B and the image pickup element-side (Z2-side) surface of the lens holding member 2.

The accommodating portion 82s is configured to be capable of accommodating 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 dam 82 is formed at a position adjacent to the second holding portion 72B, and therefore, the side wall of the second holding portion 72B is preferably used as a part of the dam 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 tip (end on the Z2 side) thereof is positioned closer to the imaging element 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 side plate spring 26B and the extension 33B of the coil 3 are electrically and physically connected to each other by a conductive adhesive CA obtained by dispersing a conductive filler such as silver particles in a synthetic resin. Specifically, before the second lower plate spring 26B is mounted on the lens holding member 2, the conductive adhesive CA is applied to the accommodation portion 82s of the lens holding member 2 surrounded by the dam 82, and then the second lower plate spring 26B is mounted on the lens holding member 2. The protruding portion 2t of the lens holding member 2 is heat staked, and the conductive adhesive CA is heat cured. The process from the step of applying the conductive adhesive CA to the accommodating 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 properly held at a desired position (position within the accommodating portion 82 s). Since a part of the connection portion 33c is disposed in the accommodating portion 82s, a part of the connection portion 33c is buried in the conductive adhesive CA. The conductive adhesive CA is not limited to the thermosetting type, and may be an ultraviolet curing type or a moisture curing type.

Further, the second lower side plate spring 26B and the extension portion 33B of the coil 3 may be electrically and physically connected by welding instead of the conductive adhesive CA. 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 may be electrically and physically connected to the extension 33B.

Next, the stationary-side member RG will be described. The fixed-side part RG includes: a spacer 1, a housing 4 and a magnet group 5 fixed to an upper plate spring 16; and a base member 18 to which the first lower leaf spring 26A and the second lower leaf 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 to fourth protruding portions 18t1 to 18t 4) protruding upward in a circular and convex shape are provided on a surface (upper surface) of the base member 18 on the object side (Z1 side). The protruding portion 18t is inserted into 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 protruding portion 18t is fixed to the fixing portion 26d by heat staking. In fig. 13 (a), 13 (C) and 13 (D), the protruding portion 18t is illustrated in a state in which the tip end after heat staking has been deformed. The same applies to other drawings showing the projection 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 (first to fourth side portions 18s1 to 18s 4) 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 directions of the first side portion 18s1 and the second side portion 18s2 intersect with the extending directions of the third side portion 18s3 and the fourth side portion 18s 4.

In the base member 18, a metal member 7 shown in fig. 13 (B) is injection-molded and embedded, 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 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 to the upper surface (surface on the Z1 side) of the base member 18 as the plate spring connecting portion 7 AP. Similarly, as shown in fig. 13C, the second metal member 7B is configured such that a part of the leaf 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 connecting portion 7AP includes a first leaf spring connecting portion 7AP1 and a second leaf spring connecting portion 7AP2.

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

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 connecting portion 7AP1 and the second leaf spring connecting portion 7AP2, respectively. Similarly, the second metal member 7B is electrically and mechanically connected to the second lower plate spring 26B by welding at the plate spring connecting portion 7 BP. Welding is achieved, for example, by laser welding.

Fig. 13 (D) shows a state in which the first leaf spring connecting portion 7AP1 and the first fixing portion 26D1 are joined by welding the metal LW1 at the through hole 26v (refer to fig. 11 (B)) formed in the first fixing portion 26D 1. Similarly, fig. 13 (D) shows a state in which the second leaf spring connecting portion 7AP2 and the second fixing portion 26D2 are joined by the weld metal LW2 at the through hole 26v (see fig. 11 (B)) formed in the second fixing portion 26D2, and the leaf spring connecting portion 7BP and the third fixing portion 26D3 are joined by the weld metal LW3 at the through hole 26v (see fig. 11 (B)) 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 connecting 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 connecting portion 26 hB. Therefore, the coil 3 can receive the supply of electric current via 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 the image pickup device is mounted via an external terminal portion 7AT extending downward (Z2 direction) from an end portion on the front 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 the image pickup element is mounted via an external terminal portion 7BT extending downward (Z2 direction) from an end portion on the front side (Y2 side) of the base member 18.

As shown in fig. 2 (a), the base member 18 is fixed to the housing 4 by an adhesive after being positioned by 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.

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 current flows from the external terminal portion 7AT of the first metal member 7A to the extension portion 33A of the coil 3 and current flows from the extension 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 a case where current flows from the external terminal portion 7BT of the second metal member 7B to the extension portion 33B of the coil 3 and 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 by welding at the through hole 26 v. The broken line DL1 indicates that the first fixing portion 26d1 is engaged with the first leaf spring connecting portion 7AP 1. Further, 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. The broken line DL2 indicates that the second fixing portion 26d2 is engaged with the second leaf spring connecting 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 33A of the coil 3 is connected to the first coil connection portion 26hA of the first lower leaf spring 26A by a 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 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. The broken line DL5 indicates that the extension 33B is connected to the second coil connecting portion 26 hB.

The current flowing from the external terminal portion 7AT of the first metal member 7A to the extension portion 33A of the coil 3 passes through two conductive paths CP (first conductive path CP1 and second conductive path CP 2) connected in parallel between the first plate spring connection portion 7AP1 and the first coil connection portion 26 hA. The first conductive path CP1 is a part of a conductive path extending to the extension 33A through the external terminal portion 7AT, the first plate 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 solid arrows. The second conductive path CP2 is a part of a conductive path extending to the extension 33A through the external terminal portion 7AT, the first leaf spring connecting portion 7AP1, the connecting 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 the arrow of the 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 CP3. The third conductive path CP3 is a conductive path that reaches the external terminal portion 7BT through the extension portion 33B, the second coil connecting portion 26hB of the inner portion 16i, the third elastic arm portion 26g3, the third fixing portion 26d3, and the leaf spring connecting portion 7BP, as indicated by the arrow of the two-dot chain line.

Next, a stopper ST for restricting the movement of the lens holder 2 will be described with reference to fig. 15 to 17. Fig. 15 is a top perspective view of the lens holder 2 and the base member 18. Fig. 15 shows a state in which the lens holder 2 is moved upward (Z1 direction) away from the base member 18 for clarity. Fig. 16 shows the positional relationship among the lens holding member 2, the lower plate 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 when no current is supplied to the coil 3. Specifically, fig. 16 (a) 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 leaf 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 plate spring 26, and the base member 18 at the YZ plane of the one-dot chain line L1 including fig. 16 (a). Fig. 17 is a top perspective view of the base member 18. Specifically, fig. 17 (a) 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 movement of the lens holding member 2. In the present embodiment, the stopper ST is configured to be capable of mainly restricting the parallel movement of the lens holding member 2 downward (Z2 direction) and the rotation of the lens holding member 2 around the optical axis JD.

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

More specifically, the stopper ST includes a first stopper ST1 and a second stopper ST2. The first stopper ST1 is constituted by 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 is constituted by a second convex portion 18P2 and a second concave portion 18U2 formed on the second side portion 18s2 of the base member 18, and a second protruding portion 2P2 formed on the lens holding member 2.

The broken line in fig. 15 shows the correspondence between the protruding portion 2P and the recessed portion 18U constituting the stopper portion 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 concave portion 18U1, and the second protruding portion 2P2 constituting the second stopper portion ST2 corresponds to the second concave portion 18U2.

The recess 18U is a recess formed in the upper surface of the base member 18, and includes first to fourth recesses 18U1 to 18U4. The first recess 18U1 is a recess formed in the first side 18s1, and is configured to receive the first protrusion 2P1. The second recess 18U2 is a recess formed in the second side portion 18s2, and is configured to receive the second protruding portion 2P2. The third recess 18U3 is a recess formed in the first side 18s1, and is configured to receive the first holding portion 72A. The fourth recess 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, as shown in fig. 16, the first protruding portion 2P1 constituting the first stopper portion ST1 is configured to contact the inner bottom surface of the first recess 18U1 in the initial state. That is, the inner bottom surface of the first concave portion 18U1 is an abutment surface with the first protruding portion 2P1, and movement of the lens holding member 2 to the lower side is restricted. The same applies to the second protruding portion 2P2 constituting the second stopper portion ST 2. However, it is also possible to: in the initial state, a gap is formed between the first protruding portion 2P1 and the inner bottom surface of the first concave portion 18U 1. That is, 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 concave portion 18U3 in the initial state. That is, in the present embodiment, the combination of the first holding portion 72A and the third concave 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 concave portion 18U3 in the initial state. That is, the combination of the first holding portion 72A and the third concave 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 protruding portion 2P1 in the initial state, that is, the height of the inner bottom surface of the first concave portion 18U1 is set 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 configuration is achieved by disposing the first protruding portion 2P1 so as not to overlap the first lower leaf spring 26A in the Z-axis direction. The same applies to the second protruding portion 2P 2. The rectangle RT1 indicated by the broken line in fig. 11 (B) represents the position of the lower end surface of the first protruding portion 2P1 in the initial state, and the rectangle RT2 indicated by the broken line in fig. 11 (B) represents the position of the lower end surface of the second protruding portion 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 fixing portion 26d1 and the second fixing portion 26d2 of the first lower leaf spring 26A.

As shown in fig. 15, the protruding portion 18P constituting the stopper ST is formed adjacent to the recessed portion 18U. In the present embodiment, the first convex portion 18P1 constituting the first stopper ST1 is formed on the Y2 side of the first concave portion 18U1, and the second convex portion 18P2 constituting the second stopper 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 on the Y1 side (surface indicated by a thick dot pattern) is flush with one side surface SF2 (surface indicated by a thin dot pattern) constituting the wall portion of the first concave portion 18U1, and faces the side surface on the Y2 side of the first protruding portion 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 indicated by arrow AR1 in fig. 16 (a), the side surface on the Y2 side of the first protruding portion 2P1 contacts both the side surface SF1 on the Y1 side of the first protruding portion 18P1 and the side surface SF2 on the Y2 side of the first recessed portion 18U1 when the lens holding member 2 is rotated clockwise around the optical axis JD. When the lens holding member 2 is positioned at a relatively high position, the side surface on the Y2 side of the first protrusion 2P1 is not in contact with the side surface SF2 on the Y2 side of the first concave portion 18U1 but is in contact with only the side surface SF1 on the Y1 side of the first convex portion 18P1 when the lens holding member 2 is rotated clockwise around the optical axis JD as indicated by an arrow AR1 in fig. 16 (a). 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 indicated by arrow AR2 in fig. 16 (a), the side surface on the Y2 side of the second protruding portion 2P2 contacts both the side surface on the Y1 side of the second protruding portion 18P2 and the side surface on the Y2 side of the second recessed portion 18U2 when the lens holding member 2 is rotated counterclockwise around the optical axis JD. When the lens holding member 2 is positioned at a relatively high position, the side surface on the Y2 side of the second protruding portion 2P2 is not in contact with the side surface on the Y2 side of the second concave portion 18U2 but is in contact with only the side surface on the Y1 side of the second convex portion 18P2 when the lens holding member 2 is rotated counterclockwise about the optical axis JD as indicated by an arrow AR2 in fig. 16 (a). 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 the rotation restricting portion that restricts the rotation of the lens holding member 2 around the optical axis JD. In the present embodiment, the recess 18U formed in the base member 18 functions as a part of a translation restricting portion that restricts 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 portion 18P and the concave portion 18U function as a part of a translation regulating portion that regulates the 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 to fourth magnets 5A to 5D) facing the coil 3; a base member 18 disposed below the lens holding member 2 on the image pickup device side, and in which the metal member 7 is buried; and a leaf spring 6 as a support member, which is provided so as to connect the lens holding member 2 to the base member 18, and which supports the lens holding member 2 so as to be movable in the optical axis direction. The leaf spring 6 has a first lower leaf spring 26A as a first leaf spring connected to one end of the coil 3 and a second lower leaf spring 26B as a second leaf 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 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 side portion 26e and the inner side portion 16 i; and a coil connection portion 26h connected to the coil 3.

As shown in fig. 13 (B) and 13 (C), the metal member 7 includes: the first metal member 7A includes an external terminal portion 7AT exposed to the outside from the base member 18 and a leaf spring connection portion 7AP to which an outer portion 26e of the first lower leaf spring 26A is connected; and a second metal member 7B including an external terminal portion 7BT exposed to the outside from the base member 18 and a leaf spring connection 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 current to the coil 3 via the first metal member 7A, the second metal member 7B, the first lower leaf spring 26A, and the second lower leaf spring 26B.

As shown in fig. 14, the outer portion 26e of the first lower leaf spring 26A includes a first fixing portion 26d1 and a second fixing portion 26d2 fixed to the base member 18 at positions apart from each other, and the elastic arm portion 26g of the first lower leaf spring 26A includes 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 connecting portion 7AP of the first metal member 7A has a first leaf spring connecting portion 7AP1 and a second leaf spring connecting portion 7AP2 connected to each other via a connecting portion 7 AJ. The first fixing portion 26d1 of the first lower leaf spring 26A is connected to the first leaf spring connecting portion 7AP1, and the second fixing portion 26d2 of the first lower leaf spring 26A is connected to the second leaf spring connecting portion 7AP2.

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 plate spring 26A. The two conductive paths CP arranged in parallel are a first conductive path CP1 indicated by a solid arrow and a second conductive path CP2 indicated by a one-dot chain line arrow.

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 elastic arm portion 26g1, the inner portion 26i, and the second elastic arm portion 26g 2. That is, the first fixing portion 26d1 may be configured not to be connected to the second fixing portion 26d2 through a portion such as the frame portion 16r of the upper leaf spring 16.

With this configuration, the lens driving device 101 is reduced in size by an amount that at least a portion such as the frame portion 16r is omitted from the first lower leaf spring 26A. In the lens driving device 101, the second conduction path CP2 is ensured in addition to the first conduction path CP1 by the connection portion 7AJ of the first metal member 7A, and therefore, even when a portion such as the frame portion 16r is omitted from the first lower leaf spring 26A, it is possible to suppress the on-resistance from becoming high when a current flows to the coil 3.

A stopper ST for restricting the movement of the lens holder 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 portion ST that restricts movement of the lens holding member 2 may be provided in a space between the first protruding portion 18t1 to which the first fixing portion 26d1 is attached and the second protruding portion 18t2 to which the second fixing portion 26d2 is attached. This structure is achieved by omitting such a portion of the frame portion 16r from the first lower leaf spring 26A. This is because, when the first fixing portion 26d1 and the second fixing portion 26d2 are connected by a connection portion such as the frame portion 16r, the stopper portion ST cannot be provided in the space between the first fixing portion 26d1 and the second fixing portion 26d 2. If the stopper ST is provided, the stopper ST interferes with the connecting portion.

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

As shown in fig. 15, the stopper portion ST may have a first stopper portion ST1 and a second stopper portion ST2. In the example shown in fig. 15, the first stopper ST1 includes: a first concave portion 18U1 as an abutting portion formed on an upper surface of the base member 18; and a first protruding portion 2P1 protruding from the lens holding member 2 toward the first concave portion 18U1 side. As shown in fig. 16 (B), the tip of the first protruding portion 2P1 is located at a position lower than the upper surfaces of the first fixing portion 26d1 and the second fixing portion 26d2 by a height H1 in the optical axis direction. The first stopper ST1 is configured to restrict the movement of the lens holder 2 downward by the first recess 18U1 and the first protrusion 2P 1. The same applies to the second stopper ST2.

In this way, the stopper portion ST is arranged so as not to interfere with the lower plate spring 26, and therefore, can be formed to have a larger size. That is, the stopper portion ST can be formed so that the contact area becomes large when the protruding portion 2P formed in the lens holding member 2 contacts the recess 18U formed in the base member 18. Therefore, the stopper ST can reliably restrict the downward translation of the lens holder 2.

A concave portion 18U and an upwardly protruding convex portion 18P adjacent to the concave portion 18U may be provided on the upper surface of the base member 18. That is, the stopper ST may include the convex portion 18P as a constituent element. Specifically, as shown in fig. 15, the base member 18 may be provided with a first convex portion 18P1 protruding upward. In this case, the inner bottom surface of the first concave portion 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 (surface indicated by a thick dot pattern) of the first convex portion 18P1 is flush with one side surface SF2 (surface indicated by a thin dot pattern) of the wall portion constituting the first concave portion 18U1, and faces 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 holder 2 about 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 around 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 around the optical axis JD.

As shown in fig. 16B, a first holding portion 72A that protrudes downward (Z2 direction) from the lower surface (Z2 side surface) of the lens holding member 2 and holds an extension 33A, which 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 tip 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 secure the protruding amount of the holding portion 72 and can appropriately hold the extension portion 33 of the coil 3. 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 that restricts downward translation of the lens holding member 2.

As shown in fig. 13 (a), the base member 18 may have an opening 18k in the center, and may have 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 directions of the first side portion 18s1 and the second side portion 18s2 may intersect with the extending directions of the third side portion 18s3 and the fourth side portion 18s4.

Further, a connection portion 7AJ for connecting the first leaf spring connection portion 7AP1 and the second leaf spring connection portion 7AP2 in the first metal member 7A may be buried in the first side portion 18s 1.

The second side 18s2 may include a portion where the metal member 7 is not embedded, and may include a trace portion 18m where 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 include a third fixing portion 26D3 and a fourth fixing portion 26D4 fixed to the base member 18 and facing each other with the trace portion 18m 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 structure can prevent the metal member 7 from being displaced during the molding process. This is because the metal member 7 is not buried 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 plate 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 connecting 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 connected to each other via a connection 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, between the external terminal portion 7BT of the second metal member 7B and the second coil connection portion 26hB of the second lower plate spring 26B, two conductive paths may be arranged similarly to the two conductive paths CP arranged between the external terminal portion 7AT of the first metal member 7A and the first coil connection portion 26hA of the first lower plate spring 26A. In the example shown in fig. 14, only the third conductive path CP3 indicated by the arrow of the two-dot chain line 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 connection portion 26hB of the second lower leaf spring 26B can further reduce the on-resistance when current is caused to flow to the coil 3.

The first leaf 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 leaf 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 leaf spring connecting portion 7BP of the second metal member 7B and the third fixing portion 26d3 of the second lower leaf 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 stainless steel, for example.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiment. The above-described embodiments may be variously modified and replaced without departing from the scope of the present invention. The features described with reference to the above embodiments may be appropriately combined as long as they are not technically contradictory.

For example, in the above embodiment, the magnet group 5 includes four magnets (first magnet 5A to fourth magnet 5D) so as to extend along each of the first side plate portion 4A1 to fourth side plate portion 4 A4. 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 4 A4.

In the above embodiment, the recess 18U formed in the base member 18 is configured such that the entire circumference of the recess 18U is surrounded by the wall. However, the recess 18U may omit the inner wall (the side closer to the optical axis JD). 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 when the lens holding member 2 moves so that the first protruding portion 2P1 faces inward (X2 side), the movement is restricted by the side face of the outer side (X2 side) of the second protruding portion 2P2 coming into contact with the wall of the outer side (X2 side) of the second concave portion. Further, by this omission, the shape of the base member 18 can be simplified.

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 disposed below the lens holding member and having a metal member embedded therein; a kind of electronic device with high-pressure air-conditioning system

A support member that connects the lens holding member to the base member and supports the lens holding member so as to be movable in the optical axis direction,

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

the first leaf spring and the second leaf 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 part 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 leaf spring connecting portion connected to the fixed side supporting portion of the first leaf spring; and a second metal member having an external terminal portion exposed to the outside from the base member and a leaf spring connecting portion connected to the fixed side supporting portion of the second leaf spring,

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

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

the fixed side supporting portion of the first leaf spring has a first fixing portion and a second fixing portion fixed at positions separated from each other of the base member, the elastic arm portion of the first leaf 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,

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

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

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

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

2. The lens driving apparatus according to claim 1, wherein,

in the first leaf spring, the first fixing portion is connected to the second fixing portion only via the first elastic arm portion, the movable side support portion, and the second elastic arm portion.

3. The lens driving apparatus according to claim 2, wherein,

a stopper portion is provided between the first fixing portion and the second fixing portion to restrict movement of the lens holder.

4. The lens driving apparatus according to claim 3, wherein,

the limit part comprises: an abutting portion formed on an upper surface of the base member; and a protrusion portion protruding from the lens holding member toward the contact portion side,

the tip of the protruding portion is located at a position 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 movement of the lens holding member to the lower side.

5. The lens driving apparatus according to claim 4, wherein,

a concave part and a convex part protruding upwards adjacent to the concave part are arranged on the upper surface of the base component,

the inner bottom surface of the concave portion forms the abutting portion,

the side surface of the convex portion is flush with the side surface of the wall portion constituting the concave portion and faces the protruding portion of the lens holding member,

the concave portion, the convex portion, and the protruding portion restrict a movement of the lens holding member about the optical axis.

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

and a holding portion which protrudes downward from a lower surface of the lens holding member and holds one end portion of the coil, wherein 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 an optical axis direction.

7. The lens driving apparatus according to any one of claims 1 to 5, wherein,

the base member has an opening in the center, and has a first side portion, a second side portion, a third side portion, and a fourth side portion disposed so as to surround the opening,

the extending directions of the first side portion and the second side portion intersect with the extending directions of the third side portion and the fourth side portion,

a connecting portion for connecting the first leaf spring connecting portion and the second leaf spring connecting portion of the first metal member is buried in the first side portion,

the second side portion includes a portion in which the metal member is not buried, and includes a trace portion in which a trace of a gate used when the base member is molded from a synthetic resin material remains,

The fixed side supporting portion of the second leaf spring has a third fixing portion and a fourth fixing portion fixed to the base member and facing each other with the trace portion interposed therebetween,

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

8. The lens driving apparatus according to any one of claims 1 to 5, wherein,

the fixed side supporting portion of the second leaf spring has a third fixing portion and a fourth fixing portion fixed at positions separated from each other in the base member,

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

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

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

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

9. The lens driving apparatus according to any one of claims 1 to 5, wherein,

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 apparatus of any one of claims 1 to 9;

the lens body; and

an imaging element is disposed opposite to the lens body.