CN113056705B

CN113056705B - Lens driving device and camera module

Info

Publication number: CN113056705B
Application number: CN201980075226.9A
Authority: CN
Inventors: 大友胜彦; 中川正义
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2018-11-14
Filing date: 2019-10-30
Publication date: 2022-12-30
Anticipated expiration: 2039-10-30
Also published as: JPWO2020100601A1; WO2020100601A1; CN113056705A; JP7117393B2

Abstract

The lens driving device (101) is provided with a lens holding member (2), a coil (3), a magnet (5), and a lower plate spring (26). The coil (3) has a winding portion (13) and an extension portion (33) connected to the winding portion (13). The lower leaf spring (26) has an inner portion (26 i), an outer portion (26 e), and an elastic arm portion (26 g) provided between the inner portion (26 i) and the outer portion (26 e). A lens holding member (2) is provided with a holding section (72B). A part of the extending portion (33B) of the coil (3) is wound around the holding portion (72B) to form a winding portion (33 m). The winding portion (33 m) and the inner portion (26 i) are brazed. A covering portion (ZN) covered by the wound portion (33 m) in the outer peripheral surface of the holding portion (72) has a contact portion (ZN 1) with which the wound portion (33 m) is in contact and a non-contact portion (ZN 2) with which the wound portion (33 m) is not in contact.

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 including a lens holding member and a coil arranged 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. Further, the coil and the plate spring are connected by brazing.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2015-99322

Disclosure of Invention

Technical problem to be solved by the invention

In the lens driving device, it is desired to improve the reliability of the joining between the coil and the plate spring by soldering as described above.

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 connected to the coil main body portion, the plate spring having: 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, wherein the lens holding member is provided with a holding portion, a part of the extending portion of the coil is wound around the holding portion to form a wound portion, the wound portion and the movable side support portion are brazed, and a covering portion of an outer peripheral surface of the holding portion, which is covered with the wound portion, includes: a contact portion with which the winding portion is in contact and a non-contact portion with which the winding portion is not in contact.

Effects of the invention

The above-described means can transfer heat during soldering to the extending portion (winding portion), and thus provides a lens driving device in which reliability of the joint between the coil and the plate spring by soldering is improved.

Drawings

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

Fig. 2A is an upper perspective view of the lens driving device.

Fig. 2B is a front view of the lens driving device.

Fig. 3A is a plan view of the lens driving device.

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

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

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

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

Fig. 5B is an upper perspective view of the lens holding member in a state in which the coil is wound.

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

Fig. 6B is a lower perspective view of the lens holding member in a state in which the coil is wound.

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

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

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

Fig. 8B is a lower perspective view of the lens holding member in a state in which the coil is wound.

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

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

Fig. 10A is a bottom view of the lens driving device in a state where parts are omitted.

Fig. 10B is a bottom view of the lens driving device in a state where parts are omitted.

Fig. 11A is a plan view of the upper leaf spring.

Fig. 11B is a plan view of the lower leaf spring.

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

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

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

Fig. 13B is an upper perspective view of the base member in a state where the lower leaf spring is attached.

Fig. 14A is a perspective view of the holding portion.

Fig. 14B is a perspective view of the holding portion.

Fig. 15A is a bottom view of the holding portion.

Fig. 15B is a perspective view of the holding portion.

Fig. 16A is a bottom view of the holding portion.

Fig. 16B is a bottom view of the holding portion.

Fig. 17A is a perspective view of the holding portion.

Fig. 17B is a perspective view of the holding portion.

Fig. 18 is a perspective view of the holding portion.

Fig. 19A is a perspective view of the holding portion.

Fig. 19B is a perspective view of the holding portion.

Fig. 20A is a bottom view of the holding portion.

Fig. 20B is a perspective view of the holding portion.

Fig. 21A is a bottom view of the holding portion.

Fig. 21B is a bottom view of the holding portion.

Fig. 22A is a perspective view of the lens holding member.

Fig. 22B is a perspective view of the lens holding member.

Fig. 22C is a perspective view of the lens holding member.

Fig. 22D is a perspective view of the lens holding member.

Fig. 23A is a perspective view of a holding portion of the lens holding member of fig. 22A.

Fig. 23B is a perspective view of a holding portion of the lens holding member of fig. 22B.

Fig. 23C is a perspective view of the holding portion of the lens holding member of fig. 22C.

Fig. 23D is a perspective view of a holding portion of the lens holding member of fig. 22D.

Fig. 24 is a side view of the holding portion of the lens holding member of fig. 22D.

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. 2A is an upper perspective view of the lens driving device 101, and fig. 2B is a front view of the lens driving device 101 as viewed from the Y2 side. Fig. 3A is a plan view of the lens driving device 101, and fig. 3B is a bottom view of the lens driving device 101. Fig. 4A is a top perspective view of the lens driving device 101 with the spacer 1 and the yoke 4 omitted, and corresponds to fig. 2A. Fig. 4B is a front view of the lens driving device 101 with the spacer 1 and the yoke 4 omitted, and corresponds to fig. 2B.

As shown in fig. 1, the lens driving device 101 includes: a lens holding member 2 capable of holding the lens body LS; a drive mechanism MK that moves the lens holding member 2 in an optical axis direction JD (Z axis direction) related to the lens body LS; a plate spring 6 that supports the lens holding member 2 so as to be movable in the optical axis direction JD; a fixed-side member RG to which the plate spring 6 is fixed; and a terminal 7 for bringing an electrical connection with the outside. The lens body LS is, for example, a cylindrical lens barrel including at least 1 lens, and is configured such that the center axis thereof is along the optical axis direction JD. The optical axis direction JD includes a direction of an optical axis related to 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 4 magnets 5 arranged to face the four sides of the coil 3. The fixed-side member RG includes the spacer 1, the yoke 4, and the base member 18 in which the 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 rectangular parallelepiped 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 image pickup 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 source via the lower plate spring 26, the terminal 7, and a conductor pattern formed on the substrate. When a current flows through the coil 3, the driving mechanism MK generates an electromagnetic force in the optical axis direction JD.

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

Next, the lens holding member 2 and the drive mechanism MK will be described. Fig. 5A is an upper perspective view of the lens holding member 2, and fig. 5B 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. 5A. Fig. 6A is a lower perspective view of the lens holding member 2, and fig. 6B 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. 6A. Fig. 7A is a plan view of the lens holding member 2, and fig. 7B is a side view of the lens holding member 2 as viewed from the X1 side. Fig. 8A is a lower perspective view of the lens holding member 2, and fig. 8B is a lower perspective view of the lens holding member 2 in a state where the coil 3 is wound around the lens holding member 2 shown in fig. 8A. Fig. 9A is an enlarged view of the range S shown in fig. 8B, and fig. 9B is an enlarged view of the range P shown in fig. 6B. Fig. 10A 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. 10B 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. 5A, the lens holding member 2 includes: a cylindrical portion 12 surrounding a hole formed to penetrate the lens holding member 2 along the optical axis direction JD; and a flange portion (flange-like portion) 52 formed at a portion on the imaging element side (Z2 side) in the optical axis direction JD. The cylindrical portion 12 is formed in a cylindrical shape in a portion on the subject side (Z1 side) in the optical axis direction JD.

The cylindrical portion 12 has a screw groove formed in the inner circumferential surface of a cylindrical shape, and the lens body LS is attached thereto. Further, the cylindrical portion 12 is provided with a pedestal portion 12d having 2 recessed portions 12dh on the end surface on the subject side at 2 positions with respect to the optical axis. As shown in fig. 4A, an inner portion 16i of the upper leaf spring 16 is placed on the base portion 12d.

As shown in fig. 5A, 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 outer shape of an octagonal shape in a plan view so as to be able to support the octagonal annular coil 3. On the subject side of the coil support portion 12j, eaves 12h (see fig. 7A and 7B) projecting radially outward so as to face the flange portion 52 in the optical axis direction JD are formed at 4 locations. As shown in fig. 5B, the coil 3 is wound in an octagon ring shape around the outer peripheral surface side of the lens holding member 2 so as to be supported by the coil support portion 12j and sandwiched between the flange portion 12h and the flange portion 52 in the optical axis direction JD.

The flange portion 52 projects radially outward from the outer peripheral surface of the portion of the cylindrical portion 12 on the imaging element side (Z2 side). The coil 3 is disposed on the subject side of the flange portion 52. As shown in fig. 6B, 2 cutout portions 52k are formed in the flange portion 52 so as to face each other with the optical axis of the lens body LS interposed therebetween. The notch 52k is penetrated with an extension 33 which is a part of the conductive wire material constituting the coil 3. Specifically, the extension 33A, which is a part of the wire material on the winding start side of the coil 3, is inserted through one of the notches 52k, and the extension 33B, which is a part of the wire material on the winding end side of the coil 3, is inserted through the other notch 52k. The edge of flange 52 forming 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 2 holding portions 72 as substantially square convex protruding portions and 6 circular convex protruding portions 2t protruding downward (Z2 direction) from the surface on the image pickup device side (Z2 side).

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 and held by the holding portions 72.

As shown in fig. 6A and 10A, the protruding portions 2t include 3 protruding portions 2t corresponding to the

lower leaf spring

26A and 3 protruding portions 2t corresponding to the lower leaf spring 26B. An inner portion 26i as 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 portions 26i of the

lower leaf springs

26A and 26B is achieved by heat caulking the protruding portions 2t inserted through the through holes formed in the inner portions 26i. In fig. 6A and 10A, the protruding portion 2t is shown in a state in which the tip thereof is deformed after being heat staked. The same applies to the other drawings illustrating the protruding portion 2t.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10B, the drive mechanism MK includes a coil 3, a

yoke

4, and 4 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. 6B, the coil 3 is formed by winding a conductive (metal) wire material (lead 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 octagon shape, and an extending portion 33 extending from the winding portion 13 and wound around the holding portion 72. In fig. 6B, for the sake of clarity, the winding portion 13 is not illustrated in a detailed wound state of the conductive wire material having a surface covered with the insulating member. That is, fig. 6B shows a detailed winding state of the wire material in a simplified manner. The same applies to other drawings illustrating the winding portion 13.

The extension 33 includes: an extension portion 33A connected to an end portion (winding start portion) of the winding portion 13 located on the inner circumferential side of the winding portion 13 on the winding start side of the coil 3; and an extension portion 33B 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. 9A, the extension 33A includes: a winding portion 33m wound around the holding portion 72A; an opposing portion 33c extending opposite to the bottom surface (surface on the Z2 side) of the flange portion 52; and an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the subject side (Z1 side). As shown in fig. 9B, the extension 33B includes: a winding portion 33m wound around the holding portion 72B; an opposing portion 33c extending opposite to the bottom surface (surface on the Z2 side) of the flange portion 52; and an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the subject side (Z1 side).

In the present embodiment, the extension portion 33A is wound around the holding portion 72A 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. In the example shown in fig. 9A, a part of the wire material constituting the coil 3 is wound by 3 turns in 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 material constituting the coil 3 is wound around the outer periphery of the lens holding member 2.

After a part of the wire material constituting the coil 3 is wound around the holding portion 72A, the wire material is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 9A, the wire extending from the winding portion 33m extends along the bottom surface of the flange portion 52, passes through the notch portion 52k from the lower side of the flange portion 52, and extends to the upper side of the flange portion 52. At this time, a portion along the bottom surface of flange 52 constitutes opposing portion 33c of extending portion 33A, and a portion passing through notch 52k constitutes insertion portion 33k of extending portion 33A.

The insertion portion 33 of the extension portion 33A is configured to contact the edge portion of the flange portion 52 as shown in fig. 9A when extending upward from the lower side of the flange portion 52. Therefore, when a strong impact is applied to the lens driving device 101 due to a fall or the like, the extending portion 33A of the coil 3 is pressed against the edge of the flange portion 52. In the present embodiment, the edge of the flange 52 is curved. Therefore, the extending portion 33A is not easily cut at the edge of the flange portion 52. The edge of the flange 52 that contacts the extension 33B may be curved.

As shown in fig. 5B, 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 side of 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. 5A). Further, since the inner peripheral surface of the wound portion 13 is supported by the coil support portion 12j with a good isotropy Heng Liang, the wound 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 the winding of the wire rod 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 through the notch portion 52k as shown in fig. 9B. Specifically, the insertion portion 33k passes through the notch portion 52k, the facing portion 33c extends along 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. 9B, the extending portion 33B is wound with 3 turns 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 manufactured by punching, drawing, and the like of 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 cylindrical outer wall portion 4A and a flat plate-like rectangular ring-shaped upper surface portion 4B provided continuously to an 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. 10B, and is coupled to the base member 18 to constitute a frame together with the base member 18 as shown in fig. 2A and 2B. However, the yoke 4 may be made of nonmagnetic 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 rectangular parallelepiped shape. As shown in fig. 10B, the 4 magnets 5 are disposed outside the coil 3 and along four sides of the rectangular-tube-shaped 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, with an N-pole inside and an S-pole outside. The magnet 5 may be arranged such that the inside is an S pole and the outside is an N pole.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 11A and 11B are diagrams illustrating the leaf spring 6. Specifically, fig. 11A is a plan view of the upper leaf spring 16, and fig. 11B is a plan view of the lower leaf spring 26. Fig. 12A and 12B are diagrams illustrating an example of a connection structure between the lower leaf spring 26A and the coil 3. Specifically, fig. 12A is an enlarged view of the range T shown in fig. 10A, and fig. 12B is an enlarged view of the lower plate spring 26A, the coil 3, and the lens holding member 2 when the range T shown in fig. 10A is viewed from the X2 side. In fig. 12A and 12B, the solder SD is shown with cross hatching for ease of explanation. Fig. 13A and 13B are views for explaining base member 18 constituting fixed-side member RG. Specifically, fig. 13A is an upper perspective view of the base member 18, and fig. 13B 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 (strictly, the spacer 1), 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 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 also function as a power supply member for supplying current to the coil 3. Therefore, the lower plate spring 26A is electrically and mechanically connected to one end of the coil 3, and the lower plate spring 26B is electrically and mechanically connected to the other end of the coil 3. The spacer 1 is disposed between the upper plate spring 16 and the yoke 4. The spacer 1 is arranged 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. 11A, the upper leaf spring 16 has a substantially rectangular shape, and includes: 2 inner portions 16i serving as movable side support portions fixed to the lens holding member 2; an outer portion 16e serving as a fixed-side support portion fixed to the fixed-side member RG; and 4 resilient arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the 2 inner portions 16i are disposed so as to face each other across the center. The outer portion 16e has 4

corner portions

16b and 4 bar portions 16r connecting adjacent 2 corner portions 16 b. The 4 horizontal portions 16r are sandwiched between the spacer 1 and the magnet 5 and fixed by an adhesive. The spacer 1, the yoke 4, and the magnet 5 function as the fixed-side member RG.

When the upper leaf spring 16 is assembled to the lens driving device 101, as shown in fig. 4A, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see fig. 5A). The inner portion 16i and the base portion 12d are fixed by an adhesive AD (see fig. 4A), whereby the inner portion 16i is fixed 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. 11A, 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 is 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.

As shown in fig. 11B, the lower leaf spring 26A and the lower leaf spring 26B are configured such that their inner shapes are substantially semicircular. The lower leaf spring 26A and the lower leaf spring 26B each include: an inner portion 26i 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 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. 11B, the inner portion 26i of each of the lower leaf spring 26A and the lower leaf spring 26B includes: 3 inner joining portions 26c that engage with the

lens holding member

2, 2 first connecting portions 26p that connect between the 3 inner joining portions 26c, and a web portion 26h that faces the extension portion 33 of the coil 3.

When the

lower leaf springs

26A and 26B are assembled in the lens driving device 101, the 6 protruding portions 2t of the lens holding member 2 shown in fig. 6A are inserted into and fitted into circular through holes provided in the inner joint portions 26c of the

lower leaf springs

26A and 26B shown in fig. 11B. 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 leaf 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 description of the lower leaf spring 26A is also applicable to the lower leaf spring 26B.

As shown in fig. 12A 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 facing portion 33c of the extending portion 33A of the coil 3 extends through 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 image pickup device side (Z2 side).

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

The lower plate spring 26A and the extension 33A of the coil 3 are electrically and mechanically connected by the solder SD. Specifically, after the projecting portion 2t of the lens holding member 2 is heat-staked, solder paste is applied to the surface of the connecting plate portion 26h on the image pickup device side (Z2 side) so as to contact the winding portion 33m of the extending portion 33A. Solder paste is also called cream solder. Thereafter, the solder paste is heated and melted by the laser beam, and the lower plate spring 26A and the extension portion 33A are joined by the solder SD. The application of the solder paste to the bonding with the solder SD is performed in a state where the lens holding member 2 is turned upside down so that the holding portion 72 protrudes vertically upward. Therefore, the solder paste melted by the laser beam can be appropriately held at a desired position (on the web portion 26 h) even with fluidity.

As shown in fig. 11B, the outer portion 26e of the lower leaf spring 26A includes 2 outer engaging portions 26d that engage with the base member 18, and a second coupling portion 26q that couples the 2 outer engaging portions 26d. The through hole provided in the outer engagement portion 26d of the lower leaf spring 26A is fitted into a protruding portion 18t (see fig. 13A) 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. 11B, the lower leaf spring 26A and the lower leaf spring 26B are formed substantially bilaterally symmetrical to each other. The lower plate spring 26A is connected to the lens holding member 2 at 3 inner engaging portions 26c, and is connected to the base member 18 at 2 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 a well-balanced manner in a state of being movable in the optical axis direction JD.

Next, stationary-side member RG will be described. Fixed-side member RG includes spacer 1 for fixing upper plate spring 16, yoke 4, and magnet 5, and base member 18 for fixing lower plate spring 26A and lower plate spring 26B, 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. 13A, the base member 18 is a member having a rectangular plate-like outer shape, and a circular opening 18k is formed in the center. Further, 6 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 spring 26A and the lower leaf spring 26B. At this time, the protruding portion 18t is fixed to the outer joining portion 26d by heat caulking. In fig. 13A and 13B, the protruding portion 18t is shown in a state in which the tip thereof is deformed after being heat-staked. The projecting portion 18t may be fixed to the outer joining portion 26d by cold caulking.

As shown in fig. 13A, the base member 18 is embedded with the terminal 7, and the terminal 7 is formed of a metal plate made of a material such as 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. The

terminals

7A and 7B, which are electrically insulated from each other, are electrically and mechanically connected to a conductor pattern of a substrate (not shown) on which the imaging element is mounted. The terminal 7A is electrically and mechanically connected to the lower plate spring 26A at the exposed portion thereof, and the terminal 7B is electrically and mechanically connected to the lower plate spring 26B at the exposed portion thereof. The lower plate spring 26A is electrically and mechanically connected to one end of the coil 3, and the lower plate spring 26B is electrically and mechanically connected to the other end of the coil 3. Therefore, the coil 3 can receive a current from a power supply via the terminal 7, the lower plate spring 26A, and the lower plate spring 26B.

In the base member 18, similarly to the terminal 7, a connection member 57 is also embedded by insert molding, and the connection member 57 is formed of a metal plate made of a material such as copper, iron, or an alloy containing these as a main component. As shown in fig. 2A and 2B, the connecting member 57 partially exposes the base member 18 at positions corresponding to the lower ends of the four corners of the yoke 4. The base member 18 is positioned by combining the inner surface of the lower end portions of the four corners of the yoke 4 and the outer peripheral side surfaces of the 4 corners of the base member 18, and then the 4 connecting members 57 and the lower end portions of the four corners of the yoke 4 are welded and fixed to the yoke 4. The yoke 4 and the base part 18 may also be fixed at least partially with an adhesive.

Next, details of the holding portion 72 will be described with reference to fig. 14A, 14B, 15A, 15B, 16A, 16B, 17A, and 17B. Fig. 14A and 14B are perspective views of the holding portion 72B wound around the extending portion 33B (winding portion 33 m) connected to the winding end side end portion of the winding portion 13. Fig. 14A and 14B show a state of the holding portion 72B when the holding portion 72B is viewed from different directions from each other. Fig. 15A and 15B show the holding portion 72B in a state in which the extending portion 33B is wound. Fig. 15A is a bottom view of the holding portion 72B around which the extending portion 33B is wound. Fig. 15B is a perspective view of the holding portion 72B around which the extending portion 33B is wound, and corresponds to fig. 14A. Fig. 16A and 16B show the relationship between the holding portion 72B and the lower leaf spring 26B. Fig. 16A is a bottom view of the holding portion 72B when the lower leaf spring 26B is attached to the lens holding member 2. Fig. 16B is a bottom view of the holding portion 72B when the solder paste SDP is applied to the lower leaf spring 26B, and corresponds to an enlarged view of the range U shown in fig. 10A. Fig. 17A and 17B show the relationship between the holding portion 72B and the lower leaf spring 26B. Fig. 17A and 17B correspond to fig. 15B. Fig. 17A is a perspective view of the holding portion 72B when the lower leaf spring 26B is attached to the lens holding member 2. Fig. 17B is a perspective view of the holding portion 72B when the solder paste SDP is applied to the lower leaf spring 26B. Hereinafter, the configuration related to the holding portion 72B will be mainly described. However, the following description is also applicable to the configuration related to the holding portion 72A wound around the extending portion 33A connected to the winding start side end portion of the winding portion 13.

The holding portion 72B protrudes from one end portion in the optical axis direction JD of the lens holding member 2 toward the opposite side to the other end portion. That is, the holding portion 72B is configured to protrude from the end surface of the lens holding member 2 on the image pickup device side (Z2 side) in the Z2 direction along the optical axis direction JD. Specifically, as shown in fig. 14A and 14B, the holding portion 72B has a substantially quadrangular prism shape having 4 side surfaces (first side surface S1 to fourth side surface S4) and an end surface ST.

The first side surface S1 to the third side surface S3 are formed of flat surfaces. The fourth side surface S4 and the end surface ST have groove portions GR. The groove portion GR extends along the optical axis direction JD, which is the protruding direction of the holding portion 72B, and is formed to be continuous over the entire length HT (see fig. 14A) of the holding portion 72B in the Z-axis direction. Therefore, the fourth side surface S4 is divided into 2 flat surfaces S4a and S4b. In addition, the end surface ST is formed of a flat surface having a concave contour. However, at least 1 of the first side surface S1, the second side surface S2, the third side surface S3, the flat surface S4a, the flat surface S4b, and the end surface ST may have another surface shape such as a convex curved surface.

As shown in fig. 15A and 15B, the winding portion 33m is wound 3 turns around the holding portion 72B so as to form 4 corner portions CN and 4 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 first side EG1 is disposed in contact with the first side S1, the second side EG2 is disposed in contact with the second side S2, and the third side EG3 is disposed in contact with the third side S3. The fourth side EG4 is disposed so as to contact the flat surfaces S4a and S4b constituting the fourth side surface S4.

Of the first to fourth side surfaces S1 to S4 constituting the outer peripheral surface of the holding portion 72B, the covering portion ZN covered with the winding portion 33m of the extending portion 33B has a contact portion ZN1 with which the winding portion 33m is in contact and a non-contact portion ZN2 with which the winding portion 33m is not in contact. In fig. 14A and 14B, a mesh pattern is given to the contact portion ZN1, and a fine dot pattern is given to the non-contact portion ZN2. As is apparent from fig. 14A, the non-contact portion ZN2 is formed by a groove portion GR provided on the fourth side surface S4 which is a part of the outer peripheral surface of the holding portion 72B.

As shown in fig. 15A, the groove portion GR has a depth D1, which is a length along the Y-axis direction, and a width W1, which is a length along the X-axis direction. The width W1 is preferably formed to be larger than the depth D1. This is to maximize the area of the winding portion 33m facing the non-contact portion ZN2, that is, the area of the portion of the winding portion 33m not in contact with the holding portion 72B. That is, the contact area between the holding portion 72B and the winding portion 33m, which is the area of the contact portion ZN1, is as small as possible. Specifically, the holding portion 72B is provided to ensure a strength capable of stably holding the winding portion 33m and to minimize the contact area. In addition, the effect produced by reducing the area of the contact portion ZN1 will be described later.

The lower leaf spring 26B is attached to the lens holding member 2 after the extending portion 33B (winding portion 33 m) is wound around the holding portion 72B. The lower plate spring 26B includes a connecting plate portion 26h to which solder paste SDP is applied, as shown in fig. 16A. 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 when the lower leaf spring 26B is attached to the lens holding member 2.

The solder paste SDP applied to the connecting plate portion 26h is a mixture of solder powder (solder SD) and flux, and when a laser beam is irradiated, the flux evaporates and the solder SD melts. Fig. 16B shows the solder paste SDP before being irradiated with the laser beam. The melted solder SD is solidified as shown in fig. 12A, and then the connecting plate portion 26h and the winding portion 33m are joined.

In the present embodiment, as shown in fig. 16A, the connecting plate portion 26h of the lower leaf spring 26B is disposed so as to face the fourth side surface S4 of the holding portion 72B. That is, the connecting plate portion 26h is disposed so as to face the fourth edge portion EG4 of the winding portion 33m wound around the holding portion 72B. As shown in fig. 17A, the web portion 26h is disposed such that at least a part of the winding portion 33m is located below (on the Z2 side) the web portion 26h.

The solder paste SDP is applied to the connecting plate portion 26h so as to adhere to at least 1 of the plurality of fourth side portions EG4. In the present embodiment, the solder paste SDP is applied so as to be attached to all of the 3 fourth sides EG4, as shown in fig. 16B and 17B.

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.

Thereafter, the solder paste SDP is heated by the laser beam, and the connecting plate portion 26h and the winding portion 33m are soldered. A dotted circle SP of fig. 16B indicates a light spot of a laser beam irradiated to the solder paste SDP. The laser generating device that generates the laser beam irradiated to the solder paste SDP is controlled by, for example, a PWM method. In addition, the laser beam may be irradiated toward the connecting plate portion 26h.

Specifically, when the solder paste SDP is heated by the laser beam, the connecting plate portion 26h and the winding portion 33m are heated by heat conduction through the solder paste SDP. At this time, as shown in fig. 17B, the fourth side EG4 constituting the winding portion 33m is in contact with the 2 flat surfaces S4a and S4B constituting the fourth side S4, but is not in contact with the portion where the groove portion GR is formed. Therefore, the holding portion 72B having the groove portions GR can suppress the heat transmitted to the winding portion 33m from being dissipated through the holding portion 72B, as compared with the structure without the groove portions GR. That is, the holding portion 72B having the groove portions GR can suppress a decrease in heating efficiency when the winding portion 33m is heated. As a result, the winding portion 33m is rapidly heated to a temperature suitable for brazing. Further, the winding portion 33m is maintained at a temperature suitable for brazing for an appropriate time. The connecting plate portion 26h, the wound portion 33m, and the solder SD can be joined with less heat than in the case where the holding portion 72B does not have the groove portion GR. Further, it is possible to effectively suppress the dissipation of the solder SD due to the bumping of the flux caused by the temperature difference between the connecting plate portion 26h and the winding portion 33m and the unnecessary diffusion of the solder SD on the connecting plate portion 26h. Further, the adhesion of the solder SD to the wound portion 33m is improved, and the reliability of the joint between the wound portion 33m and the lower leaf spring 26B by brazing is improved.

The groove portion GR may be formed so as to be continuous over the entire length HTa (see fig. 14A) of the covering portion ZN covered by the winding portion 33m of the extending portion 33B, instead of over the entire length HT (see fig. 14A) of the holding portion 72B. Specifically, the groove GR may be a recess having a height corresponding to the entire length HTa of the covering portion ZN as shown in fig. 18.

Next, another configuration example of the holding portion 72 will be described with reference to fig. 19A, 19B, 20A, and 20B. Fig. 19A and 19B are perspective views of the holding portion 72B corresponding to the winding end side of the coil 3, with fig. 19A corresponding to fig. 14A and fig. 19B corresponding to fig. 14B. Fig. 19A and 19B show a state of the holding portion 72B when the holding portion 72B is viewed from different directions from each other. Fig. 20A and 20B show the holding portion 72B in a state in which the extending portion 33B of the coil 3 is wound, and fig. 20A corresponds to fig. 15A and fig. 20B corresponds to fig. 15B. Fig. 20A is a bottom view of the holding portion 72B around which the extending portion 33B is wound. Fig. 20B is a perspective view of the holding portion 72B around which the extending portion 33B is wound, and also corresponds to fig. 19A.

The holding portion 72B in fig. 19A and 19B differs from the holding portion 72B in fig. 14A and 14B in which the groove portions GR are formed only on the fourth side surface S4 in that the groove portions GR are formed on the first side surface S1 to the fourth side surface S4, respectively.

Specifically, a first groove portion GR1 is formed in the first side surface S1, a second groove portion GR2 is formed in the second side surface S2, a third groove portion GR3 is formed in the third side surface S3, and a fourth groove portion GR4 is formed in the fourth side surface S4.

Therefore, the first side surface S1 is divided into 2 flat surfaces S1a and S1b, the second side surface S2 is divided into 2 flat surfaces S2a and S2b, the third side surface S3 is divided into 2 flat surfaces S3a and S3b, and the fourth side surface S4 is divided into 2 flat surfaces S4a and S4b. The end surface ST is formed of a flat surface having a substantially cross-shaped or substantially X-shaped contour.

As shown in fig. 20A, the first side EG1 of the winding portion 33m is disposed so as to contact the flat surfaces S1a and S1b constituting the first side surface S1, the second side EG2 is disposed so as to contact the flat surfaces S2a and S2b constituting the second side surface S2, the third side EG3 is disposed so as to contact the flat surfaces S3a and S3b constituting the third side surface S3, and the fourth side EG4 is disposed so as to contact the flat surfaces S4a and S4b constituting the fourth side surface S4.

Therefore, as shown in fig. 19A and 19B, the covering portion ZN covered with the winding portion 33m of the extending portion 33B has a contact portion ZN1 of each of the 8 flat surfaces S1a, S1B, S2a, S2B, S3a, S3B, S4a, and S4B and a non-contact portion ZN2 formed by the first to fourth groove portions GR1 to GR4.

According to this configuration, the holding portion 72B in fig. 19A and 19B can further suppress the heat transferred to the winding portion 33m from being dissipated through the holding portion 72B, as compared with the holding portion 72B in fig. 14A and 14B. Therefore, the winding portion 33m is rapidly heated to a temperature suitable for brazing, and is maintained at the temperature suitable for brazing for an appropriate time.

In the holding portion 72B in fig. 19A and 19B, the groove portions GR are formed on all of the 4 side surfaces, but the groove portions GR may be formed on 1, 2, or 3 side surfaces out of the 4 side surfaces.

Next, still another configuration example of the holding portion 72 will be described with reference to fig. 21A and 21B. Fig. 21A and 21B are bottom views of the holding portion 72B corresponding to the winding end side of the coil 3. In fig. 21A and 21B, the position of the non-contact portion ZN2 in the outer peripheral surface of the holding portion 72B is indicated by a thick solid line.

The holding portion 72B in fig. 21A is different from the holding portion 72B in fig. 14A and 14B in that a first groove portion GR1 is formed between the third side surface S3 and the fourth side surface S4, and a second groove portion GR2 is formed between the fourth side surface S4 and the first side surface S1. The holding portion 72B in fig. 21B is different from the holding portion 72B in fig. 14A and 14B in that a first groove portion GR1 is formed between the first side surface S1 and the second side surface S2, a second groove portion GR2 is formed between the second side surface S2 and the third side surface S3, a third groove portion GR3 is formed between the third side surface S3 and the fourth side surface S4, and a fourth groove portion GR4 is formed between the fourth side surface S4 and the first side surface S1. The holding portion 72B in fig. 14A and 14B has only 1 groove portion GR formed between the flat surface S4A and the flat surface S4B constituting the fourth side surface S4.

The holding portion 72B in each of fig. 21A and 21B is different from the holding portion 72B in fig. 14A and 14B in that a non-contact portion ZN2 is arranged on 1 side surface so as to sandwich a contact portion ZN1. In holding portion 72B in fig. 14A and 14B, 2 contact portions ZN1 are arranged on 1 side surface (fourth side surface S4) so as to sandwich non-contact portion ZN2.

According to this configuration, the holding portion 72B in each of fig. 21A and 21B can further suppress the heat transferred to the winding portion 33m from being dissipated through the holding portion 72B, as compared with the holding portion 72B in fig. 14A and 14B. Therefore, the winding portion 33m is rapidly heated to a temperature suitable for brazing, and is maintained at the temperature suitable for brazing for an appropriate time.

In addition, a plurality of contact portions ZN1 and non-contact portions ZN2 may be formed on 1 side surface. For example, the contact portion ZN1 and the non-contact portion ZN2 may be arranged in 2 on 1 side surface in an alternating arrangement.

Next, still another configuration example of the holding portion 72 will be described with reference to fig. 22A to 22D, fig. 23A to 23D, and fig. 24. Fig. 22A to 22D are views for explaining a procedure of joining the lower leaf spring 26 and the wound portion 33m with solder. Fig. 22A is a perspective view of the lens holding member 2. Fig. 22B is a perspective view of the lens holding member 2 around which the coil 3 is wound. Fig. 22C is a perspective view of the lens holding member 2 to which the lower leaf spring 26A and the lower leaf spring 26B are further attached. Fig. 22D is a perspective view of the lens holding member 2 when solder paste SDP is further applied to the connecting plate portion 26h. Fig. 23A to 23D are enlarged views of the holding portion 72A corresponding to the winding start side of the coil 3. Specifically, fig. 23A is an enlarged view of the range V1 of fig. 22A, fig. 23B is an enlarged view of the range V2 of fig. 22B, fig. 23C is an enlarged view of the range V3 of fig. 22C, and fig. 23D is an enlarged view of the range V4 of fig. 22D. Fig. 24 is a side view of the holding portion 72A when the solder paste SDP is applied to the connecting plate portion 26h, as viewed from the Y2 side. Hereinafter, the configuration related to the holding portion 72A will be mainly described. However, the following description is also applicable to the structure related to the holding portion 72B.

The holding portion 72A in fig. 22A to 22D is different from the holding portion 72A in fig. 9A protruding in the optical axis direction JD in that it protrudes in the direction perpendicular to the optical axis direction JD.

As shown in fig. 23A, the holding portion 72A in fig. 22A to 22D is configured to protrude from one end portion in the optical axis direction JD of the lens holding member 2, that is, from the side end portion of the flange portion 52 in the direction perpendicular to the optical axis direction JD in the X1 direction. Specifically, the holding portion 72A has a shape in which the central portion is narrowed, and has 4 side surfaces (first side surface S1 to fourth side surface S4) and an end surface ST. In fig. 23A, the first side surface S1 and the second side surface S2 are not visible.

The first side surface S1 to the third side surface S3 are formed of flat surfaces. The fourth side surface S4 and the end surface ST have groove portions GR. The groove GR extends in a direction perpendicular to the optical axis direction JD, which is the protruding direction of the holding portion 72A, and is formed to be continuous over the entire length HTb of the holding portion 72A. Therefore, the fourth side surface S4 is divided into 2 flat surfaces S4a and S4b. In addition, the end surface ST is formed of a flat surface having a concave contour.

As shown in fig. 23B, the winding portion 33m is wound by 4 turns around the holding portion 72A so as to form 4 corner portions CN and 4 side portions EG. The corner portions CN include first to fourth corner portions CN1 to CN4. The side portion EG includes first to fourth side portions EG1 to EG4. The first side EG1 is disposed in contact with the first side S1, the second side EG2 is disposed in contact with the second side S2, and the third side EG3 is disposed in contact with the third side S3. The fourth side EG4 is disposed so as to contact the flat surfaces S4a and S4b constituting the fourth side S4. In fig. 23B, the second corner CN2, the first edge EG1, and the second edge EG2 are not visible. In fig. 23B, for clarity, 4 fourth sides EG4 are defined by 1 lead line. The same applies to the other sides EG and the corner CN.

Of the first to fourth side surfaces S1 to S4 constituting the outer peripheral surface of the holding portion 72A, the covering portion ZN covered with the winding portion 33m of the extending portion 33A has a contact portion ZN1 with which the winding portion 33m is in contact and a non-contact portion ZN2 with which the winding portion 33m is not in contact. In fig. 23A, a mesh pattern is given to the contact portion ZN1, and a fine dot pattern is given to the non-contact portion ZN2. As is apparent from fig. 23A, the non-contact portion ZN2 is formed by a groove portion GR provided on the fourth side surface S4 which is a part of the outer peripheral surface of the holding portion 72A.

As shown in fig. 23A, the groove portion GR has a depth D1, which is a length along the Z-axis direction, and a width W1, which is a length along the Y-axis direction. The width W1 is preferably formed to be larger than the depth D1. This is to maximize the area of the winding portion 33m facing the non-contact portion ZN2, that is, the area of the portion of the winding portion 33m not in contact with the holding portion 72A.

As shown in fig. 23C, the lower leaf spring 26A is attached to the lens holding member 2 after the extending portion 33A is wound around the holding portion 72A. The lower plate spring 26A includes a connecting plate portion 26h coated with solder paste SDP. The web portion 26h is disposed adjacent to the winding portion 33m wound around the extension portion 33A of the holding portion 72A on the Z2 side of the holding portion 72A. The web portion 26h is preferably arranged so as not to contact the winding portion 33m, but may contact the winding portion 33m as long as the inner portion 26i does not float to the Z2 side.

In the present embodiment, as shown in fig. 24, the height H1 of the connecting plate portion 26H relative to the fourth side surface S4 of the holding portion 72A is configured to be greater than the height H2 of the fourth side portion EG4. The length P1 of the connection plate 26h protruding from the winding portion 13 of the coil 3 is smaller than the length P2 of the holding portion 72A, and is smaller than the length P3 of the winding portion 33m.

The solder paste SDP applied to the connecting plate portion 26h is a mixture of solder powder (solder SD) and flux, and when a laser beam is irradiated, the flux evaporates and the solder SD melts. Fig. 23D shows the solder paste SDP before being irradiated with the laser beam. The molten solder SD is solidified as shown in fig. 24, and then the web portion 26h and the winding portion 33m are joined.

In the present embodiment, as shown in fig. 23C, the connecting plate portion 26h of the lower leaf spring 26A is disposed so as to face the fourth side surface S4 of the holding portion 72A in the Z-axis direction. That is, the connecting plate portion 26h is disposed to face a portion of the fourth side EG4 of the winding portion 33m wound around the holding portion 72A. As shown in fig. 23C, the connecting plate 26h is provided with a semicircular notch 26hk at a position facing the other portion of the fourth edge EG4. The cutout 26hk is formed so that the solder paste SDP applied to the connecting plate portion 26h is easily attached to the fourth edge portion EG4.

As shown in fig. 23D, the solder paste SDP is applied to the connecting plate portion 26h so as to adhere to at least 1 of the plurality of fourth side portions EG4. In the present embodiment, as shown in fig. 23D, the solder paste SDP is applied to both sides (Z1 side and Z2 side) of the connecting plate portion 26h so as to be attached to all of the 4 fourth side portions EG4.

In the lens driving device 101 having the above-described configuration, after the lower plate spring 26A 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 26A disposed adjacent to the winding portion 33m.

Thereafter, the solder paste SDP is heated by the laser beam, and the connecting plate portion 26h and the winding portion 33m are soldered. A dotted circle SP in fig. 23D indicates a light spot of a laser beam irradiated to the solder paste SDP. The laser generating device that generates the laser beam irradiated to the solder paste SDP is controlled by, for example, a PWM method.

Specifically, when the solder paste SDP is heated by the laser beam, the connecting plate portion 26h and the winding portion 33m are heated by heat conduction through the solder paste SDP. At this time, as shown in fig. 23B, the fourth side EG4 constituting the winding portion 33m is in contact with the 2 flat surfaces S4a and S4B constituting the fourth side S4, but is not in contact with the portion where the groove portion GR is formed. Therefore, the holding portion 72A having the groove portions GR can suppress the heat transmitted to the winding portion 33m from being dissipated through the holding portion 72A, as compared with the structure without the groove portions GR. And, the winding portion 33m is rapidly heated to a temperature suitable for brazing and is maintained at the temperature suitable for brazing for an appropriate time. As a result, it is possible to effectively suppress the dissipation of the solder SD due to bumping of the flux caused by the temperature difference between the connecting plate portion 26h and the winding portion 33m and the unnecessary diffusion of the solder SD in the connecting plate portion 26h. Further, the adhesion of the solder SD to the wound portion 33m is improved, and the reliability of the joint between the wound portion 33m and the lower leaf spring 26A by brazing is improved.

The groove portion GR may be formed continuously over the entire length of the covering portion ZN covered with the winding portion 33m of the extending portion 33A, instead of over the entire length HTb of the holding portion 72A (see fig. 23A). Specifically, the groove portion GR may be a recess having a length corresponding to the entire length of the covering portion ZN in the X-axis direction.

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 plate spring 6 disposed so as to connect the base member 18 to the lens holding member 2 and supporting the lens holding member 2 so as to be movable in the optical axis direction JD. The coil 3 has: a winding portion 13 as a coil main body portion disposed outside the lens holding member 2; and an extension 33 connected to the winding part 13. The lower leaf spring 26B as the leaf spring 6 includes: an inner portion 26i 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; 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 72B, and a winding portion 33m is formed by winding a part of the extending portion 33B of the extending portion 33 of the coil 3 around the holding portion 72B. The winding portion 33m and the inner portion 26i of the lower leaf spring 26B are joined by brazing. The covering portion ZN as the covering portion covered with the wound portion 33m in the outer peripheral surface of the holding portion 72B has, for example, as shown in fig. 14A and 14B, a contact portion ZN1 with which the wound portion 33m is in contact and a non-contact portion ZN2 with which the wound portion 33m is not in contact.

In this configuration in which the holding portion 72B has the non-contact portion ZN2, when the solder paste SDP applied to the connecting plate portion 26h of the lower leaf spring 26B is irradiated with a laser beam, the connecting plate portion 26h and the winding portion 33m are heated together with the solder paste SDP. Since the winding portion 33m is not in contact with the non-contact portion ZN2 of the holding portion 72B, the heat transferred to the winding portion 33m can be suppressed from being excessively dissipated via the holding portion 72B. Therefore, the winding portion 33m is rapidly heated to a temperature suitable for brazing together with the connecting plate portion 26h, and is maintained at the temperature suitable for brazing for an appropriate time.

The solder SD contained in the solder paste SDP is melted by the laser beam and, for example, as shown in fig. 17B, extends around the appropriately heated connecting plate portion 26h and the winding portion 33m (fourth side portion EG 4). Then, the molten solder SD is solidified to join the connecting plate portion 26h and the winding portion 33m (fourth side portion EG 4).

In this way, the lens driving device 101 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 the holding portion 72B does not have the non-contact portion ZN2. This is because the winding portion 33m is appropriately heated and the solder easily adheres.

The non-contact portion ZN2 is preferably formed by a groove portion GR provided on the outer peripheral surface of the holding portion 72. Specifically, the non-contact portion ZN2 is formed by a groove portion GR in the fourth side surface S4 of the holding portion 72B corresponding to the winding end side of the coil 3, as shown in fig. 14A, for example. With this configuration, the holding portion 72B can improve the reliability of the joining between the coil 3 and the lower leaf spring 26 by soldering without increasing the outer dimensions.

The inner portion 26i of the lower plate spring 26 preferably has a connecting plate portion 26h on which the solder SD is provided, i.e., the solder paste SDP is applied. As shown in fig. 12A, the web 26h is connected to the other portion of the inner portion 26i via a constricted portion. This is to suppress heat loss to the other portions of the inner side portion 26i. The groove GR is formed on a side surface of the holding portion 72 provided so as to face the connecting plate portion 26h with the winding portion 33m interposed therebetween. Specifically, the fourth side surface S4 of the holding portion 72B corresponding to the winding end side of the coil 3 is disposed so as to face the connecting plate portion 26h with the winding portion 33m therebetween, as shown in fig. 16A, for example. As shown in fig. 14A, for example, a groove GR is formed on the fourth side surface S4. With this configuration, the holding portion 72B can effectively suppress heat from the fourth side portion EG4, which is most likely to transfer heat from the solder paste SDP among the 4 side portions EG, from escaping to the holding portion 72B.

The holding portion 72 is preferably formed in a polygonal column shape so as to protrude from one end portion of the lens holding member 2 in the optical axis direction JD beyond the connecting plate portion 26h in the optical axis direction JD. The groove GR is formed in a side surface of the holding portion 72 facing the connecting plate portion 26h. Specifically, as shown in fig. 17A, the holding portion 72B has a substantially quadrangular prism shape formed to protrude to the Z2 side beyond the connecting plate portion 26h in the Z-axis direction. The groove GR is formed on a fourth side surface S4 of the holding portion 72B facing the connecting plate portion 26h. With this configuration, the holding portion 72B can expose the fourth side portion EG4 on the lower side (Z2 side) of the connecting plate portion 26h, and the paste SDP can be easily applied to the fourth side portion EG4.

The groove GR is preferably configured to have a width larger than a depth. Specifically, the groove GR is configured to have a width W1 larger than a depth D1, as shown in fig. 15A, for example. With this configuration, the holding portion 72B can reduce the contact area with the winding portion 33m (fourth side EG 4) while securing strength (volume). The volume of the holding portion 72B is set so that the protruding portion (holding portion 72B) is not melted by the heat transmitted through the winding portion 33m.

The groove portion GR may extend in the protruding direction of the holding portion 72 and be continuous over the entire length of the covering portion ZN. Alternatively, the groove portion GR may extend in the protruding direction of the holding portion 72 and be formed continuously over the entire length of the holding portion 72. Specifically, the groove portion GR may be formed continuously over the entire length HT of the holding portion 72B as shown in fig. 14A, or may be formed continuously over the entire length HTa of the covering portion ZN as shown in fig. 18. With this configuration, the holding portion 72B can effectively suppress the escape of heat from the winding portion 33m (fourth side portion EG 4) to the holding portion 72B. In addition, when the groove portion GR is continuously formed up to the end surface ST of the holding portion 72B, the holding portion 72B can be easily formed by injection molding or the like. This is because the detachment from the mold becomes easy.

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, replacements, and the like 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 constituted by a protruding portion protruding from one end portion of the lens holding member 2 (the flange portion 52) in the optical axis direction JD or in the direction perpendicular to the optical axis direction JD, but the present invention is not limited to this configuration. The holding portion 72 as a protruding portion may protrude in a direction inclined with respect to the optical axis direction JD, for example.

In the above embodiment, the flange portion 52 is provided with 2 notch portions 52k through which the extending portion 33 of the coil 3 passes, but 3 or more notch portions may be provided as long as the winding portion 13 of the coil 3 can be held.

In the above-described embodiment that realizes the automatic focus adjustment function, the following configuration is adopted: the lower leaf spring 26A is electrically connected to the extending portion 33A, and the lower leaf spring 26B is electrically connected to the extending portion 33B, but the present invention is not limited to this configuration. The lens driving device with camera shake correction function according to the present invention may include, for example, the following: the upper leaf spring 16 is divided into 2 pieces, 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 a 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 a magnet 5 and a coil different from the coil 3 provided on the base member 18 so as to face the magnet 5. A flange portion having a notch portion may be provided on the upper end portion side (Z1 side) of the lens holding member 2. The holding portion 72 as a protruding portion is provided so as to protrude from an upper end portion, which is one end portion in the optical axis direction JD of the lens holding member 2 on which the upper plate spring 16 is disposed.

In the above embodiment, the coil 3 is wound in an octagon shape on the outer peripheral surface side of the lens holding member 2. However, the present invention is not limited to this configuration. The coil 3 may be a coil having an elliptical (elliptical) coil body held on the side surface of the lens holding member 2, that is, a coil body arranged such that the central axis is perpendicular to the optical axis direction JD. Specifically, the coil 3 may be a coil having 4 elliptical coil bodies held on 4 side surfaces of the lens holding member 2, or may be 2 elliptical coils held on 2 side surfaces of the lens holding member 2, which are opposed to each other.

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 housing (yoke 4).

The present application claims priority based on japanese patent application No. 2018-213957, filed on 11/14/2018, the entire contents of which are incorporated by reference into the present application.

Description of the reference numerals

1 spacer 2 lens holding member 2t projecting portion 3 coil 4 yoke 4A outer wall 4S upper face 4S housing 5 magnet 6

leaf spring

7, 7A, 7B terminal 12 tubular portion 12d pedestal portion 12dh recess 12h eaves portion 12j coil support portion 13 winding portion 16 upper side plate spring 16B corner portion 16e outer side portion 16g elastic arm 16i inner side portion 16r horizontal bar portion 18 base member 18k opening

18t projecting portion

26, 26A, 26B lower side plate spring 26c inner side engagement portion 26d outer side portion 26e arm elastic arm 26h connection plate portion 26i inner side portion 26p first connection portion 26q

second connection portion

33, 33A, 33B extension portion 33c facing portion 33k insertion portion, the 33m wound portion 52 flange 52k notch 57 connecting

members

72, 72A, 72B holding portion 101 lens driving device AD corner CN1 first corner CN1 second corner CN2 third corner CN3 fourth corner EG4 first side EG2 second side EG3 third side EG4 fourth side GR1 first groove GR2 second groove GR3 third groove GR4 fourth groove JD optical axis direction LS lens body MK driving mechanism RG fixed side member S1 first side S2 second side S3 third side S4 fourth side S1a to S4A, S1B to S4B flat surface SD solder SDP solder paste ST end surface cover ZN1 contact portion ZN2 non-contact portion.

Claims

1. A lens driving device has:

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 driving device is characterized in that,

the coil has: a coil body portion disposed outside the lens holding member; and an extension part connected with 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 holding portion,

a part of the extension portion of the coil is wound around the holding portion to form a winding portion,

the winding portion and the movable side support portion are brazed,

a covering portion of an outer peripheral surface of the holding portion, the covering portion being covered with the wire material constituting the winding portion, has: a contact portion with which the wire rod constituting the winding portion contacts and a non-contact portion with which the wire rod constituting the winding portion does not contact, the non-contact portion being covered with the wire rod constituting the winding portion.

2. The lens driving device according to claim 1,

the non-contact portion is formed by a groove portion provided on an outer peripheral surface of the holding portion.

3. The lens driving device according to claim 2,

the movable side support portion of the plate spring has a connecting plate portion to which solder is provided,

the groove portion is formed on a side surface of the holding portion provided so as to face the connecting plate portion with the winding portion interposed therebetween.

4. The lens driving device according to claim 3,

the holding portion has a polygonal prism shape formed to protrude beyond the connecting plate portion,

the groove portion is formed in a side surface of the holding portion facing the connecting plate portion.

5. The lens driving device according to any one of claims 2 to 4,

the width of the groove part is larger than the depth.

6. The lens driving device according to any one of claims 2 to 4,

the groove portion is formed to extend in a protruding direction of the holding portion and to be continuous over the entire length of the covering portion or over the entire length of the holding portion.

7. A camera module, comprising:

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

the lens body; and

and an imaging element facing the lens body.