CN112567278B

CN112567278B - Lens driving device, camera module, and method for manufacturing lens driving device

Info

Publication number: CN112567278B
Application number: CN201980053092.0A
Authority: CN
Inventors: 瓦井究
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2018-08-09
Filing date: 2019-03-19
Publication date: 2023-04-14
Anticipated expiration: 2039-03-19
Also published as: CN112567278A; WO2020031417A1; JPWO2020031417A1; JP7041750B2

Abstract

A lens driving device (101) is provided with a lens holding member (2), a coil (3), and a lower plate spring (26). The coil (3) has a winding section (13) and an extension section (33) connected to the winding section (13) as a wire. The lower leaf spring (26) has an inner portion (26 i), an outer portion (26 e), and an elastic arm portion (26 g). A lens holding member (2) is provided with a holding portion (72) as a protruding portion, a winding portion (33 m) is configured by winding a part of an extending portion (33) of a coil (3) around the holding portion (72), and the winding portion (33 m) is soldered to a lower plate spring (26) by a Solder (SD). The lower plate spring (26) has a connecting plate portion (26 h) that is adjacent to the winding portion (33 m) and is welded to the winding portion (33 m), and an elastically deformable flexible portion (26 s) that extends from the inner portion (26 i), and a portion of the flexible portion (26 s) is in contact with the extending portion (33).

Description

Lens driving device, camera module, and method for manufacturing lens driving device

Technical Field

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

Background

Conventionally, a lens driving device including a lens holding member and a coil disposed on an outer periphery of the lens holding member is known (see patent document 1). In this device, the lens holding member is held by a conductive plate spring so as to be movable in the optical axis direction. The coil and the plate spring are connected by welding.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2015-099322

Disclosure of Invention

Problems to be solved by the invention

In the lens driving device, it is desired to improve the reliability of the joint between the coil and the plate spring by the above-described welding.

Means for solving the problems

A lens driving device according to an embodiment of the present invention includes: a support member; a lens holding member capable of holding a lens body; a coil held by the lens holding member; a magnet opposed to the coil; and a plate spring disposed so as to connect the support member and the lens holding member, and supporting the lens holding member to be movable in an optical axis direction, the coil including: a coil body portion disposed outside the lens holding member; and an extension portion which is a wire connected to the coil main body portion, the plate spring having: a movable side support portion fixed to the lens holding member; a fixed side support portion fixed to the support member; and an elastic arm portion provided between the movable side support portion and the fixed side support portion, wherein a protruding portion is provided on the lens holding member, a part of the extending portion of the coil is wound around the protruding portion to form a wound portion, and the wound portion is welded to the plate spring.

Effects of the invention

In the lens driving device according to the present invention, the coil and the plate spring can be bonded to each other by welding.

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 plan view and a bottom view of the lens driving device.

Fig. 4 is an upper perspective view and a front view of the lens driving device in a state where the spacer and the yoke are omitted.

Fig. 5 is an upper perspective view of the lens holding member.

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

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

Fig. 8 is a lower 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 leaf spring and the lower leaf spring.

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

Fig. 13 is an upper perspective view of a base member of the lens drive device.

Fig. 14 is a diagram illustrating an example of a connection structure between the lower leaf spring and the coil.

Fig. 15 is a diagram illustrating another example of the connection structure between the lower leaf spring and the coil.

Fig. 16 is a bottom view of a portion of the lower leaf spring.

Fig. 17 is a bottom view of a portion of the lower leaf spring.

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 an upper perspective view of the lens driving device 101, and fig. 2 (B) is a front view of the lens driving device 101 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 an upper perspective view of the lens driving device 101 with the spacer 1 and the yoke 4 omitted, and corresponds to fig. 2 (a). Fig. 4 (B) is a front view of the lens driving device 101 with the spacer 1 and the yoke 4 omitted, 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 driving mechanism MK for moving the lens holding member 2 in an optical axis direction JD (Z axis direction) with respect to the lens body LS, a plate spring 6 for supporting the lens holding member 2 so as to be movable in the optical axis direction JD, a fixing-side member RG for fixing the plate spring 6, and a terminal 7 for bringing electrical connection to the outside. The lens body LS is, for example, a cylindrical lens barrel including at least one lens, and is configured such that a central axis thereof is along the optical axis direction JD. The optical axis direction JD includes a direction of an optical axis associated with the lens body LS and a direction parallel to the optical axis.

As shown in fig. 1, the drive mechanism MK includes a coil 3 wound in an octagonal ring shape, a yoke 4 doubling as a rectangular box-shaped outer case, and four magnets 5 arranged to face the four sides of the coil 3. Fixed-side member RG includes spacer 1, yoke 4, and base member 18 in which terminal 7 is embedded. The plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the yoke 4, 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 lower leaf spring 26A and a lower leaf spring 26B.

The lens driving device 101 has a substantially cubic shape and is mounted on a substrate (not shown) on which an imaging element (not shown) is mounted. The substrate, the lens driving device 101, the lens body LS attached to the lens holding member 2, and the imaging element attached to the substrate so as to face the lens body LS constitute a camera module. The coil 3 is connected to a power supply via the

lower leaf springs

26A and 26B, the terminal 7, and the substrate. When a current flows in the coil 3, the driving mechanism MK generates an electromagnetic force in the optical axis direction JD.

The lens driving device 101 moves the lens holding member 2 in the optical axis direction JD on the Z1 side (subject side) of the imaging element by the electromagnetic force, thereby realizing the automatic focus adjustment function. Specifically, the lens driving device 101 can perform macro photography by moving the lens holding member 2 in a direction away from the image pickup device, and can perform infinity photography by moving the lens holding member 2 in a direction toward the image pickup device.

Next, the lens holding member 2 and the drive mechanism MK will be described. Fig. 5 (a) is an upper perspective view of the lens holding member 2, and fig. 5 (B) is an upper perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 5 (a). Fig. 6 (a) is a lower perspective view of the lens holding member 2, and fig. 6 (B) is a lower perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 6 (a). Fig. 7 (a) is a plan view of the lens holding member 2, and fig. 7 (B) is a side view of the lens holding member 2 as viewed from the X1 side. Fig. 8 (a) is a lower perspective view of the lens holding member 2, and fig. 8 (B) is a lower perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 shown in fig. 8 (a). Fig. 9 (a) is an enlarged view of a portion S shown in fig. 8 (B), and fig. 9 (B) is an enlarged view of a portion P shown in fig. 6 (B). Fig. 10 (a) is a bottom view of the lens driving device 101 in a state where the terminals 7 and the base member 18 are not shown, and fig. 10 (B) is a bottom view of the lens driving device 101 in a state where the lower plate springs 26A, the lower plate springs 26B, and the lens holding member 2 are further not shown.

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 formed to penetrate along the optical axis direction JD, and a flange portion (flange-like portion) 52 formed on the imaging element side (Z2 side) in the optical axis direction JD. The cylindrical portion 12 is formed in a cylindrical shape on the subject side (Z1 side) in the optical axis direction JD.

In the cylindrical portion 12, a thread groove is provided on the inner circumferential surface of the cylindrical shape to attach the lens body LS. Further, in the cylindrical portion 12, a pedestal portion 12d having two recesses 12dh on an end surface on the subject side is provided at two positions with respect to the optical axis. As shown in fig. 4 (a), the inner portion 16i of the upper leaf spring 16 is placed on the base portion 12 d.

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 a plan view so as to be able to support the octagonal annular coil 3. Four eaves 12h (see fig. 7a and 7B) are formed on the object side of the coil support portion 12j so as to protrude radially outward so as to face the flange portion 52 in the optical axis direction JD. As shown in fig. 5 (B), coil 3 is wound in an octagon ring shape around the outer peripheral surface side of lens holding member 2 so as to be supported by coil supporting portion 12j and sandwiched between flange portion 52 and flange portion 12h in optical axis direction JD.

The flange 52 projects radially outward from the outer peripheral surface of the end 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 of the lens body LS interposed therebetween. The extended portion 33, which is a wire material constituting the coil 3, passes through the notch portion 52k. Specifically, the extended portion 33A of the wire material on the winding start side of the coil 3 passes through one of the notches 52k, and the extended portion 33B of the wire material on the winding end side of the coil 3 passes through the other of the notches 52k. The edge of the flange 52 forming the notch 52k is curved. This is to prevent or suppress the wire breakage of the coil 3 contacting the edge portion.

As shown in fig. 6a, the flange portion 52 includes two holding portions 72 as protruding portions of a square convex shape protruding downward (Z2 direction) from the surface of the imaging element side (Z2 side), and six protruding portions 2t of a circular convex shape.

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

As shown in fig. 6 (a) and 10 (a), the protruding portions 2t include three protruding portions 2t corresponding to the lower leaf spring 26A and three protruding portions 2t corresponding to the lower leaf spring 26B. An inner portion 26i, which is a movable side support portion of each of the lower leaf spring 26A and the lower leaf spring 26B, is attached and fixed to the protruding portion 2t. The fixing of the inner portion 26i of each of the

lower leaf springs

26A and 26B is achieved by heat caulking the protruding portion 2t inserted through the through hole formed in the inner portion 26i. In fig. 6 to 10, the projection portion 2t is shown in a state in which the tip end thereof is deformed after being heat staked.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10 (B), the drive mechanism MK includes the coil 3, the yoke 4, and four magnets 5 arranged to face the four sides of the yoke 4, respectively. The driving mechanism MK generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and moves the lens holding member 2 up and down in the optical axis direction JD.

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 as a coil main body portion formed by winding in an octagonal annular shape, and an extending portion 33 extending from the winding portion 13 and wound around the holding portion 72. For clarity, in fig. 6 (B), the winding portion 13 is not illustrated 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 extending portion 33 includes an extending portion 33A that is connected to an end portion (winding start portion) of the winding portion 13 on the inner peripheral side of the winding portion 13 on the winding start side of the coil 3, and an extending portion 33B that is connected to an end portion (winding end portion) of the winding portion 13 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 extending portion 33A includes a winding portion 33m wound around the holding portion 72A, an opposing portion 33c extending to face the bottom surface (Z2 side surface) of the flange portion 52, and an insertion portion 33k inserted through the notch portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side). As shown in fig. 9B, the extending portion 33B includes a winding portion 33m wound around the holding portion 72B, an opposing portion 33c extending to oppose the bottom surface (surface on the Z2 side) of the flange portion 52, and an insertion portion 33k inserted through the notch 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 33A is wound around the holding portion 72A of the lens holding member 2 before the wire of the coil 3 is wound around the outer periphery of the lens holding member 2. In the example shown in fig. 9 (a), a part of the wire of the coil 3 is wound three times around the holding portion 72A. Thereby, the winding portion 33m is formed in the holding portion 72A, and a part of the extension portion 33A is held in the holding portion 72A. However, the extension 33A may be wound around the holding portion 72A after the wire of the coil 3 is wound around the outer periphery of the lens holding member 2.

Next, 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 extends so as to face the bottom surface of the flange portion 52, and extends from the lower side of the flange portion 52 to the upper side of the flange portion 52 through the notch portion 52k. At this time, the portion facing the bottom surface of flange 52 constitutes facing portion 33c of extending portion 33A, and the portion passing through notch 52k constitutes insertion portion 33k of extending portion 33A.

When extending upward from the lower side of the flange portion 52, the insertion portion 33k of the extension portion 33A is configured to contact the edge of the flange portion 52 as shown in fig. 9 (a). Therefore, when a strong impact is applied to the lens driving device 101 due to dropping or the like, the extending portion 33A 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 configured to be curved. Therefore, the extension portion 33A is not easily cut at the edge of the flange portion 52. The edge of the flange 52 contacting the extension 33B 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 flange portion 52 on the subject side so as to be sandwiched between the flange portion 52 and the brim 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 supported in a well-balanced manner 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. Therefore, the optical axis of the lens body LS held by the lens holding member 2 is configured to easily coincide with the central axes of the lens holding member 2 and the coil 3.

When winding of the linear material around the outer periphery of the lens holding member 2 is completed, the extending portion 33B connected to the end portion of the winding portion 13 on the winding completion side is drawn out from the object side of the flange portion 52 to the image pickup device side of the flange portion 52 via the notch portion 52k, as shown in fig. 9 (B). Specifically, the insertion portion 33k passes through the notch portion 52k, the facing portion 33c extends to face the bottom surface of the flange portion 52, and the winding portion 33m is wound around the holding portion 72B of the lens holding member 2. In the example shown in fig. 9 (B), the extending portion 33B is wound three times around the holding portion 72B.

Next, the yoke 4 constituting the drive mechanism MK will be described. In the present embodiment, the yoke 4 is produced by punching and drawing a plate material made of a soft magnetic material such as iron. Specifically, as shown in fig. 1, the housing portion 4s has a box-like outer shape. The yoke 4 has a rectangular tubular outer wall portion 4A and a flat, rectangular annular upper surface portion 4B provided continuously to the upper end (end on the Z1 side) of the outer wall portion 4A. The yoke 4 configured as described above is configured to house the coil 3 and the magnet 5 in the housing portion 4s as shown in fig. 10 (B), and is coupled to the base member 18 to constitute a frame together with the base member 18 as shown in fig. 2. However, the yoke 4 may be replaced with a cover made of a non-magnetic material such as austenitic stainless steel.

Next, the magnet 5 constituting the drive mechanism MK will be described. As shown in fig. 1, the magnet 5 has a substantially cubic shape. As shown in fig. 10 (B), the four magnets 5 are located outside the coil 3 and arranged along the four sides of the rectangular tubular outer wall portion 4A constituting the yoke 4. The magnet 5 is fixed to the yoke 4 by an adhesive. The magnet 5 is disposed, for example, such that the inside is an N pole and the outside is an S pole.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 11 is a plan view of the plate spring 6. Specifically, (a) in fig. 11 is a plan view of the upper leaf spring 16, and (B) in fig. 11 is a plan view of the lower leaf spring 26A and the lower leaf spring 26B. Fig. 12 is a diagram illustrating an example of a connection structure between the lower leaf spring 26A and the coil 3. Specifically, (a) in fig. 12 is an enlarged view of a portion T shown in (a) in fig. 10, and (B) in fig. 12 is an enlarged view of the lower plate spring 26A, the coil 3, and the lens holding member 2 when the portion T shown in (a) in fig. 10 is viewed from the X2 side. Note that, in fig. 12 (a) and 12 (B), the solder SD is shown with cross hatching for ease of understanding. Fig. 13 is a diagram illustrating the base member 18 as the fixed-side member RG. Specifically, (a) in fig. 13 is an upper perspective view of the base member 18, and (B) in fig. 13 is an upper perspective view of the base member 18 in a state where the lower leaf spring 26A and the lower leaf spring 26B are assembled.

The plate spring 6 is made of a metal plate mainly made of copper alloy. As shown in fig. 1, the plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the yoke 4, and a lower plate spring 26A and a lower plate spring 26B disposed between the lens holding member 2 and the base member 18. In a state where the lens holding member 2 is engaged with the plate spring 6 (the upper plate spring 16, the lower plate spring 26A, and the lower plate spring 26B), the plate spring 6 supports the lens holding member 2 in the air so that the lens holding member 2 can move in the optical axis direction JD (Z axis direction). The lower plate spring 26A and the lower plate spring 26B function as a power supply member for supplying current to the coil 3. Therefore, the lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. The spacer 1 is disposed between the upper plate spring 16 and the yoke 4. The spacer 1 is disposed so as to prevent the lens holding member 2 from colliding with the yoke 4 when the lens holding member 2 moves in the Z1 direction. However, the spacer 1 may be omitted.

As shown in fig. 11 (a), the upper plate spring 16 has a substantially rectangular shape, and includes an inner portion 16i as a movable side support portion fixed to the lens holding member 2, an outer portion 16e as a fixed side support portion fixed to the fixed side member RG, and four elastic arm portions 16g positioned between the inner portion 16i and the outer portion 16 e. Specifically, the upper leaf spring 16 includes two inner portions 16i, and the two inner portions 16i are provided so as to face each other with the center therebetween. Outer portion 16e has four corner portions 16b and a stack 16r connecting the four corner portions 16b, respectively. The stack portion 16r is sandwiched by the spacer 1 and the magnet 5 and fixed with an adhesive. The spacer 1, the yoke 4, and the magnet 5 function as the fixed-side member RG.

As shown in fig. 4a, when the upper plate spring 16 is assembled to the lens driving device 101, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see fig. 5 a). Then, the inner portion 16i is fixed to the pedestal portion 12d with an adhesive AD (see fig. 4 a), thereby fixing the inner portion 16i to the lens holding member 2. As shown in fig. 4B, the outer portion 16e is in contact with the upper surface (surface on the Z1 side) of the magnet 5, and is sandwiched and fixed between the spacer 1 (not shown) and the magnet 5.

As shown in fig. 11 (a), the upper leaf spring 16 is formed to be substantially bilaterally symmetrical. The upper plate spring 16 is fixed to the lens holding member 2 at an inner portion 16i and fixed to the yoke 4 at an outer portion 16e via the spacer 1. Therefore, the upper plate spring 16 can support the lens holding member 2 in a well-balanced manner in the air.

As shown in fig. 11 (B), the

lower leaf springs

26A and 26B are configured such that the inner shapes thereof are substantially semicircular. The

lower leaf springs

26A and 26B include an inner portion 26i serving as a movable side support portion fixed to the lens holding member 2, an outer portion 26e serving as a fixed side support portion fixed to the base member 18 serving as a fixed side member RG, and an elastic arm portion 26g located between the inner portion 26i and the outer portion 26 e.

As shown in fig. 11 (B), the inner portions 26i of the

lower leaf springs

26A and 26B include three inner engaging portions 26c that engage with the lens holding member 2, two first connecting portions 26p that connect the three inner engaging portions 26c, and a connecting plate portion 26h that faces the extending portion 33 of the coil 3.

When the lower leaf spring 26A and the lower leaf spring 26B are assembled to the lens driving device 101, the six protruding portions 2t of the lens holding member 2 shown in fig. 6 (a) are inserted into and fitted into circular through holes provided in the inner engagement portions 26c of the lower leaf spring 26A and the lower leaf spring 26B shown in fig. 11 (B). Thereby, the inner portions 26i of the

lower leaf springs

26A and 26B are positioned and fixed to the lens holding member 2. The lower plate springs 26A and 26B are fixed to the lens holding member 2 by, for example, hot caulking or cold caulking the protruding portions 2t of the lens holding member 2.

Hereinafter, the relationship between the lower plate spring 26A, the lens holding member 2, and the coil 3 will be mainly described. However, the same description as that for the lower leaf spring 26A applies to the lower leaf spring 26B.

As shown in fig. 12 a and 12B, the connecting plate portion 26h of the inner portion 26i of the lower leaf spring 26A faces the bottom surface (surface on the Z2 side) of the lens holding member 2 when the lens driving device 101 is assembled. As shown in fig. 12B, the opposed portion 33c of the extension portion 33A of the coil 3 extends between the surface of the inner portion 26i of the lower plate spring 26A on the subject side (Z1 side) and the surface of the flange portion 52 of the lens holding member 2 on the imaging element side (Z2 side).

As shown in fig. 12B, when the lower plate spring 26A is assembled to the lens holding member 2, the holding portion 72A projects downward (Z2 direction) from the inner portion 26i of the lower plate spring 26A so that the tip thereof is positioned on the imaging element side (Z2 side) of the inner portion 26i. Further, a part of the winding portion 33m is also wound around the holding portion 72A so as to be positioned on the imaging element side (Z2 side) of the inner portion 26i.

The lower plate spring 26A is electrically and mechanically connected to the extension 33A of the coil 3 by solder SD. Specifically, after the projection portion 2t of the lens holding member 2 is heat-caulked, solder paste is applied to the surface of the connecting plate portion 26h on the imaging element side (Z2 side) so as to be in contact with the winding portion 33m of the extending portion 33A. Then, the connecting plate portion 26h and the extending portion 33A are preheated by the laser beam. Thereafter, the solder paste is heated and melted by the laser beam, and the lower plate spring 26A is joined to the extension portion 33A by the solder SD. The application of the solder paste and the bonding with the solder SD are performed in a state where the lens holding member 2 is turned upside down so that the holding portion 72A protrudes vertically upward. Therefore, the solder paste melted by the laser beam can be appropriately held at a desired position (above the land portion 26 h) even when it has fluidity.

As shown in fig. 11 (B), the outer portion 26e of the lower leaf spring 26A includes two outer engaging portions 26d that engage with the base member 18, and a second coupling portion 26q that couples the two outer engaging portions 26d. The through hole provided in the outer engaging portion 26d of the lower leaf spring 26A is fitted in a protruding portion 18t (see fig. 13 a) provided on the upper surface of the base member 18. Thereby, the outer portion 26e of the lower leaf spring 26A is positioned and fixed to the base member 18.

As shown in fig. 11 (B), the lower leaf spring 26A and the lower leaf spring 26B are formed substantially bilaterally symmetrical. The lower plate spring 26A is connected to the lens holding member 2 at three inner engaging portions 26c, and is connected to the base member 18 at two outer engaging portions 26d. The same applies to the lower leaf spring 26B. With this configuration, the lower plate springs 26A and 26B can support the lens holding member 2 in the air with good balance in a state in which the lens holding member is movable in the optical axis direction JD.

Next, the stationary-side member RG will be explained. The fixed-side member RG includes: a spacer 1, a yoke 4, and a magnet 5 that fix the upper plate spring 16; and a base member 18 to which the lower leaf spring 26A and the lower leaf spring 26B are fixed, respectively.

The base member 18 is manufactured by injection molding using synthetic resin such as liquid crystal polymer. In the present embodiment, as shown in fig. 13 (a), the base member 18 has a rectangular plate-like outer shape. A circular opening 18k is formed in the center of the base member 18. Six projecting portions 18t projecting 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 and fitted into a through hole provided in the outer joining portion 26d of each of the

lower leaf springs

26A and 26B. At this time, the projection 18t is fixed to the outer joint portion 26d by heat caulking. In fig. 13, the projection 18t is shown in a state where the tip end after the heat caulking is deformed. The projection 18t may be fixed to the outer joint portion 26d by cold caulking.

As shown in fig. 13 (a), the base member 18 is insert-molded with the terminals 7 embedded therein, which are formed of a metal plate containing copper, iron, or an alloy containing these as a main component. The terminal 7 includes a terminal 7A and a terminal 7B, and a part of each of the terminal 7A and the terminal 7B is exposed on the upper surface (surface on the Z1 side) of the base member 18. Then, the terminal 7A and the terminal 7B, which are electrically insulated from each other, are electrically connected to a conductive pattern on a substrate (not shown) on which the imaging element is mounted, respectively. The terminal 7A is electrically connected to the lower plate spring 26A, and the terminal 7B is electrically connected to the lower plate spring 26B. The lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. Therefore, the coil 3 can receive the supply of current through the terminal 7 and the

lower leaf springs

26A and 26B.

Similarly to the terminal 7, the base member 18 is embedded with a connecting member 57 formed of a metal plate containing copper, iron, an alloy mainly containing these metals, or the like. As shown in fig. 2, the connecting member 57 is partially exposed at the lower end of the four corners of the yoke 4. The base member 18 is positioned by combining the inner surface of the outer wall portion 4A of the yoke 4 and the outer peripheral side surface of the base member 18, and then the connecting members 57 are welded to the lower end portions of the four corners of the yoke 4 to be fixed to the yoke 4. Yoke 4 and base member 18 may also be secured at least partially with an adhesive.

Next, an example of a connection structure between the lower leaf spring 26 and the coil 3 will be described with reference to fig. 14. Fig. 14 includes fig. 14 (a) and 14 (B). Fig. 14 (a) is an enlarged view of a portion U shown in fig. 10 (a), and fig. 14 (B) is an enlarged perspective view of the portion U shown in fig. 10 (a). Hereinafter, the relationship between the lower leaf spring 26B, the holding portion 72B, and the extending portion 33B will be mainly described. However, the following description is also applicable to the relationship among the lower leaf spring 26A, the holding portion 72A, and the extending portion 33A.

In the present embodiment, the lower plate spring 26B includes a connecting plate portion 26h, a preheating portion 26m, a flexible portion 26s, a first contraction portion 26n1, and a second contraction portion 26n2.

The land portion 26h is a portion to which the solder paste SDP is applied. In the present embodiment, the connecting plate portion 26h is disposed adjacent to the winding portion 33m wound around the extension portion 33B of the holding portion 72B on the Y2 side of the holding portion 72B. The web portion 26h is preferably arranged so as not to contact the wound portion 33m, but may contact the wound portion 33m as long as the web portion 26h does not overlap the wound portion 33m, that is, as long as the inner portion 26i does not float. The solder paste SDP applied to the land portion 26h is a mixture of solder powder (solder SD) and flux, which evaporates and the solder SD melts when a laser beam is irradiated. Fig. 14 shows the solder paste SDP before irradiation with the laser beam. As shown in fig. 12 (a), the molten solder SD is then solidified to join the connecting plate portion 26h and the winding portion 33m.

The first constricted portion 26n1 is a portion connecting the central inner joint portion 26c (see fig. 11B) of the lower leaf spring 26B to the web portion 26h. In the present embodiment, the first constricted portion 26n1 is disposed on the Y2 side of the connecting plate portion 26h, and suppresses or prevents the solder SD melted when the solder paste SDP is heated from spreading along the surface of the lower plate spring 26B on the Z2 side toward the inner joining portion 26c side.

The preheating section 26m is a section (heating section) used for preheating the lower plate spring 26B. In the present embodiment, the preheating section 26m as the heating section is configured to irradiate a laser beam for preheating the lower plate spring 26B. The preheating section 26m may be heated by a non-contact heating method other than laser heating such as millimeter wave heating or high frequency heating, or may be heated by a contact heating method using a heater or the like. The preheating section 26m is disposed on the X2 side of the holding section 72B at a distance from the extension section 33B (winding section 33 m) wound around the holding section 72B. The preheating section 26m is disposed between the connecting plate section 26h and the flexible section 26s, and includes a portion (area) wider than the spot of the laser beam irradiated toward the preheating section 26m. In the example of fig. 14, in the preheating section 26m, an irradiation mark TR1 of the laser beam is formed in the vicinity of the root of the flexible section 26s.

The flexible portion 26s is an elastically deformable arm-shaped (cantilever-shaped) portion extending from an inner portion 26i as a movable side supporting portion. In the present embodiment, the flexible portion 26s is configured to extend from the preheating portion 26m and contact the winding portion 33m wound around the extension portion 33B of the holding portion 72B on the Y1 side of the holding portion 72B.

In the present embodiment, the flexible portion 26s includes a thin arm portion 26s1 extending in an L shape from the preheating portion 26m, and a protruding piece 26s2 as a contact piece formed at an end portion of the thin arm portion 26s1. The thin arm portion 26s1 extends in a cantilever shape from the preheating portion 26m.

The thin arm portion 26s1 has a length, width, and thickness determined so as to be more easily bent than the other portion of the lower leaf spring 26B when the protruding piece 26s2 comes into contact with the winding portion 33m. This is because the thinner arm portion 26s1 is more difficult to bend, and the greater the force applied by the flexible portion 26s to the wound portion 33m, the more easily the wound portion 33m is unwound. Further, if there is a portion that is more easily deflected than the thin arm portion 26s1, the portion is deflected before the thin arm portion 26s1 is deflected, and the lower plate spring 26B cannot be appropriately assembled to the lens holding member 2.

The thin arm portion 26s1 is more flexible as its width is smaller and more flexible as its length is longer. The thin arm portion 26s1 is more likely to be bent as its thickness decreases. In the present embodiment, since the flexible portion 26s is a part of the lower plate spring 26B, the thickness of the thin arm portion 26s1 is the same as the thickness of the other part of the lower plate spring 26B. However, the thickness of the thin arm portion 26s1 may be different from the thickness of the other portion of the lower leaf spring 26B.

In the example of fig. 14, the minimum width W1 of the thin arm portion 26s1 is larger than the thickness thereof and smaller than the spot diameter D1 of the laser beam irradiated toward the preheating portion 26m. The spot diameter D1 is larger than the diameter D2 of the wire material forming the winding portion 33m of the extension portion 33B. The minimum width W1 of the thin arm portion 26s1 may be equal to or larger than the diameter D2 of the wire rod, or may be smaller than the diameter D2 of the wire rod. In the example of fig. 14, the length of the thin arm portion 26s1 is longer than the length of one side of the winding portion 33m wound around the extension portion 33B of the holding portion 72B. However, the length of the thin arm portion 26s1 may be shorter than the length of one side of the winding portion 33m.

The projecting piece 26s2 is configured to contact the winding portion 33m wound around the extending portion 33B of the holding portion 72B. In the present embodiment, the projecting piece 26s2 as a contact piece is a portion projecting from the thin arm portion 26s1 toward the winding portion 33m, and has a semicircular contact surface. However, the projecting piece 26s2 may have a contact surface of any other shape such as a triangle or a quadrangle. In the example of fig. 14, the flexible portion 26s biases one surface of the protruding piece 26s2 toward the wire material constituting the winding portion 33m. Specifically, the flexible portion 26s presses the surface of the protruding piece 26s2 on the Z1 side against the winding portion 33m. Therefore, the thin arm portion 26s1 is slightly twisted, and the protruding piece 26s2 is in surface contact with the winding portion 33m.

In the present embodiment, the protruding piece 26s2 is disposed so as to contact a portion on the imaging element side (Z2 side) of a wire (a wire of the third turn) located closest to the imaging element side (Z2 side) among the wires of the three turns constituting the winding portion 33m. However, the projecting piece 26s2 may be arranged so as to contact the second turn of the wire of the three turns constituting the winding portion 33m, or may be arranged so as to contact the first turn of the wire located closest to the subject side (Z1 side). In addition, the protruding piece 26s2 may be configured to be in contact with the wire of two of the three turns, or may be configured to be in contact with all the wires of the three turns. The protruding piece 26s2 may also be configured to enter between the two wires.

In the example of fig. 14, the winding portion 33m is wound around the holding portion 72B so as to form four corner portions CN and four side portions EG. The corner portions CN include first to fourth corner portions CN1 to CN4. The edge portion EG includes first to fourth edge portions EG1 to EG4.

The winding portion 33m is preferably wound such that the end portion 33mE thereof is located in the vicinity of the second corner CN 2. The projecting piece 26s2 is disposed in contact with the third corner CN3 so as not to contact with the end 33mE of the winding portion 33m. This is because when the projecting piece 26s2 comes into contact with the end 33mE, there is a possibility that the end 33mE is pulled away from the holding portion 72B by the projecting piece 26s2.

When the end 33mE is located near the second corner CN2, the flexible portion 26s may be configured such that the protruding piece 26s2 contacts the second side EG2, the third side EG3, or the fourth corner CN4. Alternatively, when the end 33mE is located near the third corner CN3 or the fourth corner CN4, the flexible portion 26s may be configured such that the protruding piece 26s2 contacts the second corner CN 2.

In the present embodiment, the flexible portion 26s is configured to have one protruding piece 26s2, but may be configured to have two or more protruding pieces 26s2. In the present embodiment, the flexible portion 26s is configured such that the protruding piece 26s2 is in contact with the winding portion 33m on one of the four side surfaces of the holding portion 72B, i.e., the side surface on the Y1 side. However, the flexible portion 26s may be configured such that the protruding piece 26s2 is in contact with the winding portion 33m on two or more of the four side surfaces of the holding portion 72B.

In the example of fig. 14, the winding portion 33m is wound around the holding portion 72B in the counterclockwise direction. The flexible portion 26s is arranged to return counterclockwise from the X2 side to the Y1 side of the holding portion 72B. That is, the wound portion 33m and the flexible portion 26s are arranged to be wound around the holding portion 72B in the same direction. However, the winding portion 33m and the flexible portion 26s may be arranged to be wound around the holding portion 72B in opposite directions. For example, when the flexible portion 26s is arranged to be wound around the holding portion 72B counterclockwise from the X2 side to the Y1 side of the holding portion 72B, the wound portion 33m may be wound around the holding portion 72B clockwise. Alternatively, when the flexible portion 26s is arranged to be wound around the holding portion 72B clockwise from the X1 side to the Y1 side of the holding portion 72B, the wound portion 33m may be wound around the holding portion 72B counterclockwise.

The second constriction 26n2 is a portion connecting the preheating section 26m and the web section 26h. In the present embodiment, the second constricted portion 26n2 is disposed in the vicinity of the first corner CN1 of the wound portion 33m wound around the extended portion 33B of the holding portion 72B, at a distance from the first corner CN 1.

The second constricted portion 26n2 has a minimum width W2 significantly narrower than the width of the connecting plate portion 26h, thereby suppressing or preventing the molten solder SD from expanding toward the preheating portion 26m along the surface of the inside portion 26i when the solder paste SDP is heated.

The second constricted portion 26n2 having the minimum width W2 suppresses the heat generated in the preheating portion 26m irradiated with the laser beam from being transferred to the connecting plate portion 26h more than necessary, and transfers a desired amount of heat to the flexible portion 26s. This is because the smaller the minimum width W2, the smaller the amount of heat transferred to the connecting plate portion 26h and the larger the amount of heat transferred to the flexible portion 26s.

The minimum width W2 of the second constricted portion 26n2 is preferably larger than the minimum width W1 of the thin arm portion 26s1. This is to prevent the second constricted portion 26n2 from flexing before the thin arm portion 26s1 flexes.

In the lens driving device 101 having the above-described configuration, after the lower plate spring 26B is assembled to the lens holding member 2, the solder paste SDP is applied to the connecting plate portion 26h of the lower plate spring 26B disposed adjacent to the winding portion 33m.

Then, the laser beam is irradiated to the preheating section 26m, and the winding section 33m of the extension section 33 is heated through the elastically deformable flexible section 26s extending from the preheating section 26m. Specifically, the winding portion 33m in contact with the protruding piece 26s2 is preheated by heat generated by the preheating portion 26m irradiated with the laser beam. The connecting plate portion 26h is also preheated by the heat of the preheating portion 26m.

After that, the solder paste SDP is heated by the laser beam to weld the connecting plate portion 26h to the winding portion 33m. The dotted circle SP of fig. 14 indicates a spot of the laser beam irradiated to the solder paste SDP.

The first laser generating device that generates the laser beam (hereinafter referred to as "first laser beam") to be irradiated to the preheating section 26m and the second laser generating device that generates the laser beam (hereinafter referred to as "second laser beam") to be irradiated to the solder paste SDP are controlled by, for example, a PWM method. The power of the first laser beam may be less than the power of the second laser beam, may be greater than the power of the second laser beam, or may be the same as the power of the second laser beam. The duty cycle of the PWM signal associated with the first laser light generating device may be less than the duty cycle of the PWM signal associated with the second laser light generating device, may be greater than the duty cycle of the PWM signal associated with the second laser light generating device, or may be the same as the duty cycle of the PWM signal associated with the second laser light generating device. The first laser beam generating device and the second laser beam generating device may be the same device.

With the above-described configuration, in the lens driving device 101, the connecting plate portion 26h coated with the solder paste SDP and the winding portion 33m are preheated at the same time. Therefore, as compared with a configuration without the flexible portion 26s, that is, a configuration in which only the connecting plate portion 26h is preheated and the winding portion 33m is not preheated, dissipation due to bumping of the flux and unnecessary diffusion of the solder SD in the connecting plate portion 26h can be effectively prevented. As a result, the lens driving device 101 can improve the adhesion of the solder SD to the wound portion 33m, and can improve the reliability of the joint between the wound portion 33m and the lower plate spring 26B by soldering.

In the lens driving device 101, the preheating section 26m is thermally connected to the connecting plate section 26h via the second contracting section 26n2, and is also thermally connected to the winding section 33m via the flexible section 26s. Therefore, the wire rod constituting the winding portion 33m can be reliably and appropriately preheated without being affected by variations in the application position and the application amount of the solder paste SDP in the connecting plate portion 26h. Therefore, in this respect, the lens driving device 101 can also improve adhesion of the solder SD to the wound portion 33m, and can improve reliability of the joint between the wound portion 33m and the lower plate spring 26B by soldering.

In the lens driving device 101, the flexible portion 26s is configured to be more easily bent than the other portion of the lower plate spring 26B when contacting the winding portion 33m. Therefore, the lens driving device 101 can prevent the wire material that constitutes the winding portion 33m wound around the holding portion 72B from being peeled off from the holding portion 72B by the flexible portion 26s. Therefore, in the lens driving device 101, the winding portion 33m can be prevented from being unwound. In the lens driving device 101, when the flexible portion 26s is disposed above the winding portion 33m, the entire lower leaf spring 26B does not float from the lens holding member 2.

Next, another example of the connection structure between the lower leaf spring 26 and the coil 3 will be described with reference to fig. 15. Fig. 15 is an enlarged view of the lower leaf spring 26B, the extending portion 33B, and the holding portion 72B, and corresponds to fig. 14 (a).

The lower leaf spring 26B in fig. 15 is different from the lower leaf spring 26B in fig. 14 having cantilever-shaped flexible portions 26s in that both ends of the flexible portion 26s are connected to an inner portion 26i as a movable side support portion. The lower leaf spring 26B of fig. 15 is otherwise the same as the lower leaf spring 26B of fig. 14. Therefore, the description of the same parts will be omitted, and the detailed description of different parts will be given.

In the example of fig. 15, the flexible portion 26s includes a first thin arm portion 26s1a extending from the preheating portion 26m, a second thin arm portion 26s1b extending from the connecting plate portion 26h, and a protruding piece 26s2 serving as a contact piece. The first thin arm portion 26s1a and the second thin arm portion 26s1b are connected to each other at a portion facing the third corner CN3 of the winding portion 33m. That is, the flexible portion 26s is configured to surround the winding portion 33m wound around the holding portion 72B. Specifically, the flexible portion 26s is configured to extend along the second side EG2 and the third side EG3 of the winding portion 33m. In the example of fig. 15, a first gap between the second side EG2 and the first thin arm portion 26s1a is smaller than a second gap between the third side EG3 and the second thin arm portion 26s1 b. However, the first gap may be the same size as the second gap or may be larger than the second gap. In the example of fig. 15, the minimum width W3 of the first thin arm portion 26s1a is the same as the minimum width W4 of the second thin arm portion 26s1 b. However, the minimum width W3 may be smaller than the minimum width W4 or may be larger than the minimum width W4. In the example of fig. 15, the length of the first thin arm portion 26s1a between the protruding piece 26s2 and the preheating portion 26m is configured to be substantially the same as the length of the second thin arm portion 26s1b between the protruding piece 26s2 and the connecting plate portion 26h. However, the length of the first thin arm portion 26s1a may be longer than the length of the second thin arm portion 26s1b, or may be shorter than the length of the second thin arm portion 26s1 b.

The projecting piece 26s2 projects from the connecting portion between the first thin arm portion 26s1a and the second thin arm portion 26s1b toward the winding portion 33m. Specifically, the projecting piece 26s2 is arranged to be in surface contact with the third corner CN3 of the winding portion 33m, as in the example of fig. 14. However, the projecting piece 26s2 may be configured to be in surface contact with one or more portions of at least one of the third corner portion CN3, the second side portion EG2, and the third side portion EG3 of the winding portion 33m.

With this configuration, the lower leaf spring 26B in fig. 15 can bring the projecting piece 26s2 into contact with the winding portion 33m more reliably than the lower leaf spring 26B in fig. 14. This is because the flexible portion 26s does not flex in a direction away from the winding portion 33m. Therefore, the winding portion 33m can be preheated more reliably.

Next, still another configuration example of the lower leaf spring 26 will be described with reference to fig. 16. Fig. 16 is a bottom view of a part of the lower plate spring 26B (a part including the connecting plate portion 26h and the flexible portion 26 s).

The lower plate spring 26B in fig. 16 is different from the lower plate spring 26B in fig. 14 in that a preheating portion 26mA is formed at an end of a cantilever-shaped flexible portion 26s, but is otherwise the same as the lower plate spring 26B in fig. 14. Therefore, descriptions of common parts are omitted, and detailed descriptions of different parts are given.

In the example of fig. 16, the flexible portion 26s includes a thin arm portion 26s1 extending in a cantilever shape from the second constricted portion 26n2, and a protruding piece 26s2 formed at an end of the thin arm portion 26s1. The preheating section 26mA is connected to the end of the thin arm section 26s1, and includes a portion (area) wider than the spot of the laser beam irradiated toward the preheating section 26 mA. In the example of fig. 16, an irradiation mark TR2 of the laser beam is formed in the preheating section 26 mA.

When the preheating portion 26mA is irradiated with the laser beam, a part of the heat generated in the preheating portion 26mA which is irradiated with the laser beam is transmitted to the winding portion 33m via the protruding piece 26s2, and the winding portion 33m is preheated. The other part of the heat generated in the preheating section 26mA is transmitted to the web section 26h via the thin arm section 26s1 and the second constriction section 26n2, and the web section 26h is preheated. Thus, the winding portion 33m and the web portion 26h are preheated simultaneously.

With this configuration, the lower leaf spring 26B in fig. 16 can more reliably preheat the wound portion 33m than the lower leaf spring 26B in fig. 14. This is because the preheating section 26mA is disposed in the vicinity of the winding section 33m.

The lower plate spring 26B in fig. 16 may have a preheating part 26m similar to the lower plate spring 26B in fig. 14, in addition to the preheating part 26 mA. In this case, the preheating section 26mA and the preheating section 26m may be simultaneously preheated by different laser beams, or may be preheated by the same laser beam in a predetermined order.

Next, still another configuration example of the lower leaf spring 26 will be described with reference to fig. 17. Fig. 17 is a bottom view of a part of the lower leaf spring 26B (a part including the connecting plate portion 26h and the flexible portion 26 s).

The flexible portion 26s in fig. 17 is different from the flexible portion 26s in fig. 14 having the thin arm portion 26s1 including a portion extending parallel to the X axis in that the flexible portion 26s1 includes a portion extending obliquely to the X axis. The flexible portion 26s in fig. 17 is different from the flexible portion 26s in fig. 14 in that the width of the tip end portion of the thin arm portion 26s1 is not increased. However, the flexible portion 26s of fig. 17 is otherwise the same as the flexible portion 26s of fig. 14. Therefore, descriptions of common parts are omitted, and detailed descriptions of different parts are given.

In the example of fig. 17, the flexible portion 26s extending in a cantilever shape extends in the Y1 direction from the preheating portion 26m in a state separated from the winding portion 33m, and then extends in the X1 direction so as to approach the winding portion 33m. The portion extending in the X1 direction extends obliquely with respect to the X axis so as to approach the winding portion 33m toward the tip end portion of the thin arm portion 26s1. In the example of fig. 17, the flexible portion 26s is configured such that the distal end portion of the thin arm portion 26s1 functions as a protruding piece 26s2 serving as a contact as it approaches the winding portion 33m toward the distal end portion of the thin arm portion 26s1.

With this configuration, the flexible portion 26s1 of fig. 17 can be made longer than the flexible portion 26s of fig. 14. Therefore, the flexible portion 26s in fig. 17 can more easily bend the thin arm portion 26s1 than the flexible portion 26s in fig. 14, and can suppress or prevent the unwinding of the winding portion 33m.

As described above, the lens driving device 101 of the present embodiment includes: a base member 18 as a support member; a lens holding member 2 capable of holding the lens body LS; a coil 3 held by the lens holding member 2; a magnet 5 opposed to the coil 3; and a lower plate spring 26 as the plate spring 6 disposed so as to connect the base member 18 and the lens holding member 2 and supporting the lens holding member 2 to be movable in the optical axis direction JD. The coil 3 includes a winding portion 13, which is a coil body portion, disposed outside the lens holding member 2, and an extension portion 33, which is a wire material, connected to the winding portion 13. The lower plate spring 26 has an inner portion 26i serving as a movable side supporting portion that is disposed at one end portion (end portion on the Z2 side) in the optical axis direction JD of the lens holding member 2 and is fixed to the lens holding member 2, an outer portion 26e serving as a fixed side supporting portion that is fixed to the base member 18, and an elastic arm portion 26g provided between the inner portion 26i and the outer portion 26 e. The lens holding member 2 is provided with a holding portion 72 as a protruding portion, a part of the extending portion 33 of the coil 3 is wound around the holding portion 72 to form a wound portion 33m, and the wound portion 33m is welded to the lower plate spring 26. The lower leaf spring 26 includes a connecting plate portion 26h adjacent to the winding portion 33m and welded to the winding portion 33m, and an elastically deformable flexible portion 26s extending from the inner portion 26i, and a part of the flexible portion 26s is in contact with the extending portion 33. For example, as shown in fig. 14, the flexible portion 26s is configured to contact the winding portion 33m constituting the extending portion 33. However, the flexible portion 26s may be configured to contact the opposing portion 33c or the insertion portion 33k configuring the extending portion 33.

In this configuration, when the laser beam is irradiated to the inner portion 26i, the connecting plate portion 26h and the extending portion 33 are preheated simultaneously. For example, in the example of fig. 14, when the preheating section 26m is irradiated with a laser beam, the connecting plate section 26h is preheated through the second contraction section 26n2 by heat generated in the preheating section 26m, and the winding section 33m is preheated through the flexible section 26s. Then, when the solder paste SDP coated on the connecting plate portion 26h is irradiated with a laser beam thereafter, the solder SD contained in the solder paste SDP is melted and spread between the preheated connecting plate portion 26h and the extension portion 33, and then solidified to join the connecting plate portion 26h and the winding portion 33m.

Therefore, the lens driving device 101 can improve the reliability of the joint between the coil 3 and the lower plate spring 26 by soldering, as compared with the case where only the connecting plate portion 26h is preheated. This is because the solder is easily attached by heating the winding portion 33m through the flexible portion 26s.

The flexible portion 26s may include a contact piece formed so as to face the winding portion 33m and contacting the winding portion 33m.

The flexible portion 26s preferably includes a protruding piece 26s2 protruding toward the holding portion 72 as a protruding portion. In this case, the projecting piece 26s2 as a contact piece is configured to contact the extending portion 33. In the example of fig. 14, the projecting piece 26s2 is configured to project in a direction perpendicular to the optical axis direction JD and to be in surface contact with the winding portion 33m. With this configuration, the thin arm portion 26s1 of the flexible portion 26s is disposed apart from the winding portion 33m. Therefore, this configuration can suppress or prevent the thin arm portion 26s1 from coming into contact with the winding portion 33m and unwinding the winding portion 33m.

The flexible portion 26s is preferably configured to urge one surface of the protruding piece 26s2 as a contact piece toward the wire material configuring the winding portion 33m. In the example of fig. 14, the flexible portion 26s biases the surface on the Z1 side of the protruding piece 26s2 in the Z1 direction, and presses the wire material constituting the winding portion 33m against the surface on the Z1 side of the protruding piece 26s2. With this configuration, the flexible portion 26s can more efficiently transmit the heat generated in the preheating portion 26m to the winding portion 33m than in the case where the flexible portion 26s is in point contact with the winding portion 33m.

The flexible portion 26s preferably extends in a cantilever shape from an inner portion 26i as a movable side support portion. That is, the flexible portion 26s has a root portion connected to the movable side support portion. In the example of fig. 14, the flexible portion 26s extends in a cantilever shape from the preheating portion 26m, which is a part of the inner portion 26i of the lower plate spring 26B. With this configuration, the flexible portion 26s can include the relatively long thin arm portion 26s1. Therefore, when the projecting piece 26s2 comes into contact with the winding portion 33m, the force of the flexible portion 26s tending to separate the winding portion 33m from the holding portion 72 can be weakened, and the thin arm portion 26s1 can be prevented or suppressed from coming into contact with the winding portion 33m to open the winding portion 33m.

Both ends of the flexible portion 26s may be connected to the movable side support portion. That is, the flexible portion 26s may be formed in a double support beam shape. For example, as shown in fig. 15, the flexible portion 26s may be formed such that a first thin arm portion 26s1a extending from the preheating portion 26m and a second thin arm portion 26s1b extending from the connecting plate portion 26h are connected to each other outside the winding portion 33m. With this configuration, when an impact due to dropping or the like is applied to the flexible portion 26s, the first thin arm portion 26s1a and the second thin arm portion 26s1b can be suppressed or prevented from being excessively deformed or displaced.

The portion of the flexible portion 26s that contacts the extending portion 33 and the connecting plate portion 26h are preferably disposed so as to face each other with the holding portion 72 as a protruding portion interposed therebetween. For example, in the example of fig. 14, the protruding piece 26s2 of the flexible portion 26s and the connecting plate portion 26h are arranged to face each other with the holding portion 72B interposed therebetween. Specifically, the protruding piece 26s2 is disposed on the Y1 side of the holding portion 72B, and the connecting plate portion 26h is disposed on the Y2 side of the holding portion 72B. With this configuration, the flexible portion 26s can extend the thin arm portion 26s1. In addition, the inside part 26i can relatively easily secure the area of the preheating part 26m, which is a part irradiated with the laser beam. The lower plate spring 26 can be provided with a preheating portion 26m between the connecting plate portion 26h and the flexible portion 26s.

The movable-side support portion preferably has a preheating portion 26m as a heating portion in a portion (vicinity of the root) continuous with the root of the flexible portion 26s, and the preheating portion 26m is formed with an irradiation mark of the laser beam. For example, in the example of fig. 14, in the preheating section 26m which is a part of the inner section 26i as the movable side support section, an irradiation mark TR1 of the laser beam is formed in the vicinity of the root of the flexible section 26s. This means that the lower plate spring 26 has a portion having an area sufficient for irradiation of the laser beam in the vicinity of the root of the flexible portion 26s. With this configuration, the winding portion 33m in contact with the flexible portion 26s can be easily preheated by the heat generated in the preheating portion 26m.

The camera module according to the embodiment of the present invention includes the lens driving device 101, the lens body LS, and the image pickup device facing the lens body LS as described above.

The method for manufacturing the lens driving device 101 according to the embodiment of the present invention includes: a coating step of coating the solder paste SDP on the connecting plate portion 26h of the lower leaf spring 26 disposed adjacent to the winding portion 33 m; a first heating step of heating the extending portion 33 via an elastically deformable flexible portion 26s extending from an inner portion 26i of the lower plate spring 26 serving as a movable side support portion; and a second heating step of heating the solder paste SDP to solder the connecting plate portion 26h and the winding portion 33m. In the first heating process, when the inner portion 26i is irradiated with the laser beam, the connecting plate portion 26h and the extending portion 33 are heated (preheated) simultaneously. For example, in the example of fig. 14, when the preheating section 26m is irradiated with a laser beam, the connecting plate section 26h is heated (preheated) via the second contraction section 26n2 and the winding section 33m is heated (preheated) via the flexible section 26s by the heat generated in the preheating section 26m. Then, in the second heating step, when the solder paste SDP applied to the connecting plate portion 26h is irradiated with a laser beam, the solder SD included in the solder paste SDP is melted and spread between the heated (preheated) connecting plate portion 26h and the extending portion 33, and then is solidified to join the connecting plate portion 26h and the winding portion 33m.

Therefore, the lens driving device 101 manufactured by this manufacturing method can improve the reliability of the joining between the coil 3 and the lower plate spring 26 by soldering, as compared with the case where only the connecting plate portion 26h is heated (preheated).

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments. The above-described 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 may be combined as appropriate as long as they are not technically contradictory.

For example, in the above-described embodiment, the holding portion 72 is configured by a protruding portion protruding in the optical axis direction JD from one end portion of the lens holding member 2 (flange portion 52), but the present invention is not limited to this configuration. The holding portion 72 as the protruding portion may protrude in a direction different from the optical axis direction JD, such as a direction perpendicular to the optical axis direction JD or a direction inclined with respect to the optical axis direction JD.

In the above embodiment, the flange portion 52 is provided with two notches 52k that pass through the extension portion 33 of the coil 3, but if the winding portion 13 of the coil 3 can be held, three or more notches may be provided.

In the above-described embodiment that realizes the automatic focus adjustment function, the following configuration is adopted: the lower plate spring 26A is electrically connected to the extending portion 33A, and the lower plate spring 26B is electrically connected to the extending portion 33B, but the present invention is not limited to this configuration. For example, the present invention may be a lens driving device with a shake correction function, including: the upper leaf spring 16 is divided into two parts, one of which is electrically connected to the extending portion 33A, and the other of which is electrically connected to the extending portion 33B. In this configuration, the upper plate spring 16 is disposed so as to connect the magnet holder as the support member to the lens holding member 2, and is configured to support the lens holding member 2 so as to be movable in the optical axis direction JD. The magnet holder is a member that holds the magnet 5 facing the coil 3 held by the lens holding member 2, and is typically connected to the base member 18 via a suspension wire, and is supported by the suspension wire so as to be movable in a direction perpendicular to the optical axis direction JD. Specifically, the magnet holder is configured to be movable in a direction perpendicular to the optical axis direction JD by a drive mechanism including the magnet 5 and a coil different from the coil 3 provided on the base member 18 so as to face the magnet 5. In this configuration, a flange portion having a notch portion may be provided on the upper end side (Z1 side) of the lens holding member 2. The holding portion 72 as a protruding portion is provided at the upper end portion of the lens holding member 2 on the side where the upper leaf spring 16 is disposed.

In the above embodiment, the coil 3 is wound in an octagonal ring shape around the outer circumferential surface side of the lens holding member 2. However, the present invention is not limited to this configuration. The coil 3 may be an elliptical (oval) coil held on the side surface of the lens holding member 2. Specifically, the coils 3 may be four elliptical coils held on the four side surfaces of the lens holding member 2, or may be two elliptical coils held on two opposing side surfaces of the four side surfaces of the lens holding member 2.

In the above embodiment, the frame body constituted by the yoke 4 and the base member 18 accommodates the entire lens holding member 2. However, a part (e.g., an upper part) of the lens holding member 2 may be exposed to the outside from the frame (yoke 4).

The present application claims priority based on japanese patent application No. 2018-150663, filed on 8/9/2018, which is incorporated by reference in its entirety in the present application.

Description of the reference numerals

1 spacer 2 lens holding member 2t projection 3 coil 4 yoke 4A outer wall portion 4s receiving portion 5 magnet 6

leaf spring

7, 7A, 7B terminal 12 cylindrical portion 12d pedestal portion 12dh recessed 12h eaves 12j coil support portion 13 winding portion 16 upper side leaf spring 16B angle portion 16e outer side portion 16e inner side portion 16r of elastic arm 16i portion 18 base member 18k opening

18t projection

26, 26A, 26B lower side leaf spring 26c inner side engagement portion 26d outer side portion 26e outer side portion 26g elastic arm 26h connection plate 26i inner side portion 26m the 26mA preheating section 26n1 first contraction section 26n2 second contraction section 26p first connection section 26q second connection section 26s flexible section 26s1 thin arm section 26s1a first thin arm section 26s1B second thin arm section

26s2 protruding piece

33, 33A, 33B extending part

33c opposing part

33k insertion section 33m winding section 33mE end 52 flange 52k notch 57 connecting

parts

72, 72A, 72B holding section 101 lens driving device AD corner CN1 first corner CN2 second corner CN2 third corner CN3 fourth corner EG4 first side EG1 second side EG2 third side EG3 fourth side EG4 fourth side JD optical axis direction LS lens body MK driving mechanism RG fixed side parts SD solder paste TR1, TR2 irradiation marks.

Claims

1. A lens driving device is provided with:

a support member;

a lens holding member capable of holding a lens body;

a coil held by the lens holding member;

a magnet opposed to the coil; and

a plate spring disposed so as to connect the support member and the lens holding member, and supporting the lens holding member so as to be movable in an optical axis direction,

the coil has: a coil body portion disposed outside the lens holding member; and an extension part as a wire connected to the coil main body part,

the plate spring has: a movable side support part fixed to the lens holding member; a fixed side support part fixed to the support member; and an elastic arm portion provided between the movable side support portion and the fixed side support portion,

the lens holding member is provided with a protruding portion, a part of the extending portion of the coil is wound around the protruding portion to form a wound portion, and the wound portion is welded to the plate spring,

the plate spring has a connecting plate portion that is adjacent to the winding portion and is welded to the winding portion, and a flexible portion that extends from the movable-side support portion and is elastically deformable,

a portion of the flexible portion is in contact with the extension portion,

the movable-side support portion has a heating portion in a portion connected to a root portion of the flexible portion, and an irradiation mark of a laser beam is formed in the heating portion.

2. The lens driving device according to claim 1,

the flexible portion includes a contact piece formed to face the winding portion and in contact with the winding portion.

3. The lens driving device according to claim 2,

the flexible portion biases one surface of the contact toward the wire material constituting the winding portion.

4. The lens driving device according to any one of claims 1 to 3,

the flexible portion extends in a cantilever shape from the movable side support portion.

5. The lens driving device according to any one of claims 1 to 3,

both ends of the flexible portion are connected to the movable side support portion.

6. The lens driving device according to any one of claims 1 to 3,

the portion of the flexible portion that is in contact with the extending portion and the connecting plate portion are disposed so as to face each other with the protruding portion interposed therebetween.

7. A camera module, comprising:

the lens driving device of any one of claims 1 to 6;

the lens body; and

and an imaging element facing the lens body.

8. A method for manufacturing a lens driving device, the lens driving device comprising:

a support member;

a lens holding member capable of holding a lens body;

a coil held by the lens holding member;

a magnet opposed to the coil; and

a plate spring disposed so as to connect the support member and the lens holding member, and supporting the lens holding member to be movable in an optical axis direction,

the lens holding member is provided with a protruding portion, a winding portion is formed by winding a part of the extending portion of the coil around the protruding portion, and the winding portion is welded to the plate spring, and the method for manufacturing the lens driving device includes:

a coating step of coating a solder paste on the connecting plate portion of the leaf spring disposed adjacent to the winding portion;

a first heating step of heating the extending portion via an elastically deformable flexible portion extending from the movable-side support portion of the plate spring; and

and a second heating step of heating the solder paste to solder the connecting plate portion and the winding portion.

9. The lens driving device manufacturing method according to claim 8,

in the first heating step, the laser beam is irradiated to the heating portion of the movable support portion located in the vicinity of the root portion of the flexible portion.

10. The lens driving device manufacturing method according to claim 9,

the connecting plate portion is connected to the heating portion via a constricted portion,

in the second heating step, the solder paste applied to the connection plate portion is irradiated with a laser beam.

11. The lens drive apparatus manufacturing method according to any one of claims 8 to 10,

12. The lens drive apparatus manufacturing method according to claim 11,

13. The lens drive apparatus manufacturing method according to any one of claims 8 to 10,

the portion of the flexible portion that contacts the extension portion and the connecting plate portion are disposed so as to face each other with the protrusion portion interposed therebetween.