CN114174917A - Lens driving device and camera module - Google Patents

Abstract

The lens driving device (101) is provided with a spacer member (1), a cover member (4), a magnetic field generating member (5), and an upper plate spring (16). The cover member (4) is formed of a non-magnetic material and has an outer peripheral wall portion (4A) and a top portion (4B) that include a pair of side plate portions that face each other. A part of the spacer member (1) is disposed in contact with the top portion (4B) of the cover member (4), and the upper plate spring (16) is fixed. The spacer member (1) further comprises: a frame-shaped portion (1C) that faces the top portion (4B); and a protrusion (1P) that protrudes downward (in the direction Z2) from the frame-shaped portion (1C) and faces the outer peripheral wall portion (4A). The magnetic field generation member (5) is shaped to extend in a direction orthogonal to the optical axis direction, and is fixed to the outer peripheral wall section (4A) in a state of being sandwiched between the protrusion section (1P) and the outer peripheral wall section (4A).

Description

Lens driving device and camera module

Technical Field

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

Background

Conventionally, there is known a lens driving device including: a magnetic yoke including an outer tube portion, a lens holder (lens holding member), a coil disposed on the outer periphery of the lens holding member, and a flat permanent magnet attached to the inner wall surface of the outer tube portion so as to face the coil (see patent document 1). In the lens driving device, a flat permanent magnet is attached to an inner wall surface of an outer cylinder portion formed of a magnetic material.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-88432

Disclosure of Invention

Technical problem to be solved by the invention

The outer tube portion is sometimes formed of a non-magnetic material. The outer cylinder formed of a nonmagnetic material is used, for example, when a plurality of lens driving devices are arranged in a row. This is to prevent the outer cylindrical portion formed of a magnetic material in one lens driving device from interfering with the permanent magnet in the other lens driving device.

However, when the outer cylinder of the permanent magnet is made of a non-magnetic material, the permanent magnet cannot be attracted to the outer cylinder because the magnetic force cannot be used. Therefore, the above-described structure including the outer tube portion formed of the nonmagnetic material may be difficult to assemble.

Therefore, it is desirable to provide a lens driving device capable of improving the assembling property when the magnetic field generating member is fixed to the cover member formed of a nonmagnetic material.

Means for solving the problems

A lens driving device according to an embodiment of the present invention includes: a fixed-side member including a cover member; a lens holding member which is positioned in the cover member and can hold the lens body; a coil held by the lens holding member; a magnetic field generating member opposed to the coil; and a plate spring having: a fixed-side support portion fixed to the fixed-side member; a movable side support part fixed to the lens holding member; and an arm portion provided between the fixed-side support portion and the movable-side support portion, wherein the plate spring supports the lens holding member so as to be movable in the optical axis direction, the cover member has an outer peripheral wall portion and a top portion including a pair of side plate portions facing each other, and is formed of a non-magnetic material, the fixed-side member includes a spacer member, a part of which is disposed in contact with the cover member and to which the fixed-side support portion of the plate spring is fixed, the spacer member has a frame-shaped portion facing the top portion and a protruding portion protruding downward from the frame-shaped portion and facing the side plate portions, the magnetic field generating member has a shape extending in a direction orthogonal to the optical axis direction, and the magnetic field generating member is fixed to the side plate portions in a state of being sandwiched between the protruding portion and the side plate portions.

ADVANTAGEOUS EFFECTS OF INVENTION

By the above method, a lens driving device capable of improving the assembling property when the magnetic field generating member is fixed to the cover member formed of a nonmagnetic material is provided.

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 cover member is omitted.

Fig. 4B is an upper perspective view of the lens driving device in a state where the spacer member and the cover member 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 with the coil mounted thereon.

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

Fig. 6B is a lower perspective view of the lens holding member with the coil mounted thereon.

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

Fig. 7B is a plan view of the lens holding member with the coil mounted thereon.

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

Fig. 8B is a bottom view of the lens holding member with the coil mounted thereon.

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

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

Fig. 10A is a bottom view of the lens driving device with the metal member and the base member removed.

Fig. 10B is a bottom view of the lens driving device in a state where the metal member, the base member, the spacer member, the cover member, the upper leaf spring, and the lower leaf spring are removed.

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 bottom view of a connection structure of a lower plate spring and a coil in the lens driving device.

Fig. 12B is a side view of a connection structure of the lower plate spring and the coil in the lens driving device.

Fig. 13 is an exploded perspective view and a completed perspective view of a base member of the lens driving device.

Fig. 14A is a perspective view of the cover member.

Fig. 14B is a perspective view of the spacer member.

Fig. 14C is a perspective view of the cover member with the spacer member embedded therein.

Fig. 15A is a perspective view of the cover member with the upper leaf spring embedded therein.

Fig. 15B is a perspective view of the cover member with the second upper magnet embedded therein.

Fig. 15C is a perspective view of the cover member in which the second lower magnet is embedded.

Fig. 16A is a perspective view of a protruding portion of a spacer member.

Fig. 16B is a perspective view of the protruding portion of the spacer member.

Fig. 17A is a side view of a second projection of the spacer member.

Fig. 17B is a side view of the second protrusion and the upper leaf spring.

Fig. 17C is a side view of the second protrusion, the upper leaf spring, and the second upper magnet.

Fig. 17D is a side view of the second protrusion, the upper plate spring, the second upper magnet, and the second lower magnet.

Fig. 18A is a bottom view of the upper assembly.

Fig. 18B is an enlarged view of a main portion of the bottom surface of the upper assembly.

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 an upper perspective view of the lens driving device 101 with the cover member 4 removed, and fig. 4B is an upper perspective view of the lens driving device 101 with the spacer member 1 and the cover member 4 removed. Fig. 4A and 4B both correspond to fig. 2A.

As shown in fig. 1, the lens driving device 101 includes: a lens holding member 2 capable of holding a lens body (not shown); a drive mechanism MK for moving the lens holding member 2 in the optical axis direction (for example, the Z-axis direction) of the lens body; a plate spring 6 that supports the lens holding member 2 so as to be movable in the optical axis direction; a fixed-side member RG to which the plate spring 6 is fixed; and a metal member 7 that brings about electrical connection between an external power source and the lens driving device 101. The lens body is, for example, a cylindrical lens barrel including at least 1 lens, and the central axis thereof is formed along the optical axis direction. The "optical axis direction" includes a direction of an optical axis JD associated with the lens body and a direction parallel to the optical axis JD.

As shown in fig. 1, drive mechanism MK includes: a coil 3 having 2 oval (oval) shaped windings 13 (see fig. 5B) held on 2 opposing sides of 4 sides of the lens holding member 2 having a substantially rectangular parallelepiped outer shape; and a magnetic field generating member 5 disposed to face the coil 3 in a radial direction (a direction perpendicular to the optical axis direction).

The cover member 4 is an outer case having a rectangular box shape, and constitutes a part of the fixed-side member RG. In the present embodiment, the cover member 4 is produced by punching and drawing a plate material made of a nonmagnetic material such as austenitic stainless steel.

Specifically, as shown in fig. 1, the cover member 4 has a box-like outer shape defining the housing portion 4 s. The cover member 4 has a rectangular cylindrical outer peripheral wall portion 4A and a flat annular ceiling portion 4B provided so as to be continuous with the upper end (end on the Z1 side) of the outer peripheral wall portion 4A. An opening is formed in the top portion 4B.

The outer peripheral wall portion 4A includes first to fourth side plate portions 4A1 to 4A 4. The first side plate 4a1 and the second side plate 4a2 face each other to form a pair of side plates. Similarly, the third side panel 4A3 and the fourth side panel 4a4 face each other to form the other pair of side panels. In the present embodiment, each of the first side panel portion 4a1 and the second side panel portion 4a2 is perpendicular to each of the third side panel portion 4A3 and the fourth side panel portion 4a 4.

The cover member 4 configured as described above houses the coil 3 and the magnetic field generating member 5 in the housing portion 4s, and is coupled to the base member 18 to form a housing together with the base member 18 as shown in fig. 2A and 2B.

The magnetic field generating member 5 constitutes a part of the drive mechanism MK. In the present embodiment, as shown in fig. 1, the magnetic field generating member 5 includes a first magnetic field generating member 5A disposed so as to face the first side plate portion 4a1 and a second magnetic field generating member 5B disposed so as to face the second side plate portion 4a 2.

The first magnetic field generating member 5A is constituted by a combination of 2 dipolar magnets. Fig. 1 shows the N pole of the two-pole magnet by cross-hatching and the S pole by diagonal hatching. The same applies to other drawings illustrating the magnetic field generating member 5. The combination of 2 dipole magnets has an advantage that leakage of the magnetic field to the outside of the cover member 4 can be suppressed, as compared with 1 dipole magnet or 1 quadrupole magnet, etc., which are polarized in the optical axis direction. However, the first magnetic field generating member 5A may be constituted by 1 dipole magnet or 1 quadrupole magnet. The same applies to the second magnetic field generating member 5B.

Specifically, as shown in fig. 1, the first magnetic field generating member 5A includes a first upper magnet 5AU and a first lower magnet 5 AL. The second magnetic field generating member 5B includes a second upper magnet 5BU and a second lower magnet 5 BL.

The first upper magnet 5AU, the first lower magnet 5AL, the second upper magnet 5BU, and the second lower magnet 5BL are each substantially rectangular parallelepiped in shape. The magnetic field generating member 5 is located outside the coil 3 (winding portion 13) and is disposed along the 2-face of the outer peripheral wall portion 4A of the cover member 4. The magnetic field generating member 5 is fixed to the inner surface of the outer peripheral wall 4A by an adhesive. The first upper magnet 5AU, the first lower magnet 5AL, the second upper magnet 5BU, and the second lower magnet 5BL may be plate-shaped or rod-shaped.

The plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the cover member 4 (spacer member 1) and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B.

Fixed-side member RG includes spacer member 1, cover member 4, and base member 18 in which metal member 7 is embedded.

The spacer member 1 is disposed so as to prevent the lens holding member 2 from colliding with the cover member 4 when the lens holding member 2 moves in the Z1 direction.

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 attached to the lens holding member 2, and the image pickup element attached to the substrate so as to face the lens body constitute a camera module. The coil 3 is connected to an external power supply via the lower plate spring 26, the metal member 7, and the substrate. When a current flows from an external power supply to the coil 3, the driving mechanism MK generates an electromagnetic force in the optical axis direction.

The lens driving device 101 uses the electromagnetic force to move the lens holding member 2 in the optical axis direction on the Z1 side (subject side) of the image pickup device, thereby realizing an 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 closer 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 shows 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 shows 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 shows a state in which the coil 3 is wound around the lens holding member 2 of fig. 7A. Fig. 8A is a bottom view of the lens holding member 2, and fig. 8B shows a state in which the coil 3 is wound around the lens holding member 2 shown in fig. 8A. Fig. 9A is an enlarged perspective view of a portion P shown in fig. 8B, and fig. 9B is an enlarged perspective view of a portion Q shown in fig. 8B. Fig. 10A is a bottom view of the lens driving device 101 in a state in which the illustration of the metal member 7 and the base member 18 is omitted, and fig. 10B is a bottom view of the lens driving device 101 in a state in which the illustration of the spacer member 1, the cover member 4, the upper leaf spring 16, and the lower leaf spring 26 is further omitted.

In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, as shown in fig. 5A, the lens holding member 2 includes a cylindrical portion 12 in which a through hole extending in the optical axis direction is formed.

The cylindrical portion 12 has a thread groove on its cylindrical inner circumferential surface so as to mount the lens body. Further, the cylindrical portion 12 is provided with a pedestal portion 12d having 4 depressed portions 12dh on the end surface on the subject side. As shown in fig. 4A, the inner portion 16i of the upper leaf spring 16 is placed on the base portion 12 d.

As shown in fig. 5A, a winding protrusion 12p for holding the coil 3 is provided on the outer peripheral surface of the cylindrical portion 12. In the present embodiment, the winding projection 12p has a substantially rectangular parallelepiped shape projecting radially outward from the outer peripheral surface of the cylindrical portion 12 so that the coil 3 is wound around the axis perpendicular to the optical axis direction. Specifically, the winding projections 12p are disposed on 2 outer side surfaces of the lens holding member 2 facing each other. In the present embodiment, the winding projection 12p is disposed on the outer surface on the Y1 side and the outer surface on the Y2 side.

As shown in fig. 5B, the coil 3 is formed by winding a conductive wire material around the winding protrusion 12 p. Specifically, as shown in fig. 6B, the coil 3 includes a first coil 3A disposed so as to face the first side plate portion 4a1, a second coil 3B disposed so as to face the second side plate portion 4a2, and a connecting portion 3C connecting the first coil 3A and the second coil 3B. As shown in fig. 7A and 7B, the winding protrusion 12p includes a first winding protrusion 12pA around which the first coil 3A is wound and a second winding protrusion 12pB around which the second coil 3B is wound. In the present embodiment, the coil 3 is fixed to the winding protrusion 12p without using an adhesive, but may be fixed to the winding protrusion 12p using an adhesive. The winding direction of the coil 3 is arbitrary, and is determined, for example, by the arrangement (magnetization direction) of the magnetic field generating member 5.

The first coil 3A includes a winding portion 13 as a coil body portion formed by winding a first winding protrusion 12pA in a ring shape, and the second coil 3B includes a winding portion 13 as a coil body portion formed by winding a second winding protrusion 12pB in a ring shape. In fig. 5B, for the sake of clarity, the winding portion 13 is not illustrated in a detailed winding state of the conductive wire material having its surface covered with the edge-stop member. The same applies to other drawings illustrating the winding portion 13.

As shown in fig. 6A, the lens holding member 2 includes 2 holding portions 72 as square convex protruding portions protruding downward (in the direction Z2) from the end surface on the image pickup device side (Z2 side) and 4 protruding portions 2t having a circular convex shape.

As shown in fig. 6B, the holding portion 72 includes a first holding portion 72A corresponding to the winding start side of the coil 3 and a second 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 portion 2t includes 2 protruding portions 2t corresponding to the lower leaf spring 26A and 2 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 to and fixed to the protruding portion 2 t. The inner portions 26i of the lower leaf springs 26A and 26B are fixed by heat staking the protruding portions 2t inserted through the through holes formed in the inner portions 26 i. In the drawings relating to the present embodiment, the protruding portion 2t is shown in a state in which the tip thereof is not deformed before being heat staked. The projecting portion 2t may be cold-swaged.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10A and 10B, the drive mechanism MK includes the coil 3 and 2 magnetic field generating members 5 arranged to face the 2 side plate portions (the first side plate portion 4A1 and the second side plate portion 4A2) constituting the outer peripheral wall portion 4A of the cover member 4. Specifically, the magnetic field generating member 5 includes a first magnetic field generating member 5A disposed so as to face the first side plate portion 4a1, and a second magnetic field generating member 5B disposed so as to face the second side plate portion 4a 2. The driving mechanism MK generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnetic field generating member 5, and moves the lens holding member 2 up and down in the optical axis direction.

As shown in fig. 8B, the extending portion 33 of the coil 3 includes a first extending portion 33A coupled to the first coil 3A on the winding start side of the coil 3 and a second extending portion 33B coupled to the second coil 3B on the winding end side of the coil 3.

Specifically, as shown in fig. 9A, the first extension 33A includes: a winding portion 33m wound around the first holding portion 72A; a first opposing portion 33c extending to face a bottom surface (surface on the Z2 side) of the lens holding member 2; and a second opposing portion 33k extending opposite to an edge portion between the bottom surface and the rear surface (surface on the Y1 side) of the lens holding member 2. As shown in fig. 9B, the second extension 33B includes: a winding portion 33m wound around the second holding portion 72B; a first opposing portion 33c extending to face a bottom surface (surface on the Z2 side) of the lens holding member 2; and a second opposing portion 33k extending opposite to an edge portion between the bottom surface and the front surface (surface on the Y2 side) of the lens holding member 2.

In the present embodiment, the first extending portion 33A is wound around the first holding portion 72A of the lens holding member 2 before the wire of the coil 3 is wound around the outer periphery of the first winding protrusion 12 pA. In the example shown in fig. 9A, a part of the wire of the coil 3 is wound with 4 turns in the first holding portion 72A. Thereby, the winding portion 33m is formed in the first holding portion 72A, and a part of the first extending portion 33A is held in the first holding portion 72A. However, the first extending portion 33A may be wound around the first holding portion 72A after the wire of the coil 3 is wound around the outer periphery of the first winding protrusion 12 pA.

Next, the wire material is wound around the outer periphery of the first winding protrusion 12 pA. At this time, as shown in fig. 9A, the wire extending from the winding portion 33m extends so as to face the bottom surface of the lens holding member 2, and further extends so as to face the edge portion located between the bottom surface and the rear surface of the lens holding member 2. At this time, a portion facing the bottom surface of the lens holding member 2 constitutes the first facing portion 33c of the first extending portion 33A, and a portion facing the edge portion of the lens holding member 2 constitutes the second facing portion 33k of the first extending portion 33A.

The second opposing portion 33k of the first extending portion 33A is configured to contact the edge portion of the lens holding member 2 as shown in fig. 9A when extending to face the edge portion of the lens holding member 2. Therefore, when a strong impact is applied to the lens driving device 101 due to dropping or the like, the first extending portion 33A of the coil 3 is pressed against the edge portion of the lens holding member 2. In the present embodiment, the edge portion of the lens holding member 2 is configured to be curved. Therefore, the first extending portion 33A is less likely to be cut at the edge portion of the lens holding member 2. The same applies to the edge portion of the lens holding member 2 that contacts the second extending portion 33B.

Then, the connection portion 3C is formed by the wire drawn out from the winding portion 13 of the first coil 3A. Next, the wire rod is similarly wound around the outer periphery of the second winding protrusion 12 pB. When the winding of the wire rod around the outer periphery of the first winding protrusion 12pA and the winding of the wire rod around the outer periphery of the second winding protrusion 12pB are completed, the second extending portion 33B connected to the end portion on the winding completion side of the winding portion 13 of the second coil 3B is drawn out from the front surface side to the bottom surface side of the lens holding member 2 as shown in fig. 9B. Specifically, the second opposing portion 33k extends to face the edge portion between the bottom surface and the front surface of the lens holding member 2, the first opposing portion 33c extends to face the bottom surface of the lens holding member 2, and the winding portion 33m is wound around the second holding portion 72B of the lens holding member 2. In the example shown in fig. 9B, the second extending portion 33B is wound with 4 turns in the second holding portion 72B.

Next, the details of the leaf spring 6 and the fixed-side member RG will be described. 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 portion 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 portion T shown in fig. 10A is viewed from the Y2 side. In fig. 12A and 12B, the conductive adhesive CA as the bonding material is shown with cross hatching for ease of explanation. Fig. 13 is a diagram illustrating base member 18 as stationary-side member RG. Specifically, fig. 13 includes an exploded perspective view and a completed perspective view of the base member 18 in which the metal member 7 is embedded.

In the present embodiment, the plate spring 6 is made of a metal plate mainly made of a copper alloy. The plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the cover member 4 (spacer member 1) and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18. In a state where the lens holding member 2 and the plate spring 6 (the upper plate spring 16, the lower plate spring 26A, and the lower plate spring 26B) are engaged with each other, 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. The lower plate springs 26A and 26B function as power supply means 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 member 1 is disposed between the upper leaf spring 16 and the cover member 4.

As shown in fig. 11A, the upper leaf 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 serving as a fixed-side support portion fixed to the spacer member 1 serving as 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 inner portion 16i is provided so as to face the pedestal portion 12d (see fig. 5A) of the lens holding member 2. The outer portion 16e has 4 corner portions 16b and 4 cross portions 16r connecting the adjacent 2 corner portions 16 b. As shown in fig. 4A and 4B, 2 of the 4 horizontal portions 16r are sandwiched between the spacer member 1 and the magnetic field generating member 5 and fixed by an adhesive. The corner portion 16b is fixed to a corner of the spacer member 1 by an adhesive. The spacer member 1, the cover member 4, and the magnetic field generating member 5 function as a fixed-side member RG.

Specifically, when the upper plate 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 is fixed to the lens holding member 2 by fixing the inner portion 16i and the pedestal portion 12d with an adhesive. As shown in fig. 4B, the outer portion 16e is in contact with the upper surface (surface on the Z1 side) of the magnetic field generating member 5, and is sandwiched and fixed between the spacer member 1 (see fig. 4A) and the magnetic field generating member 5.

As shown in fig. 11A, the upper plate spring 16 has a shape that is substantially rotationally symmetrical 4 times with respect to the optical axis JD. The upper plate spring 16 is fixed to the lens holding member 2 at an inner portion 16i and fixed to the cover member 4 at an outer portion 16e via the spacer member 1. Therefore, the upper leaf spring 16 can support the lens holding member 2 in the air with good balance.

As shown in fig. 11B, the inner shapes of the lower leaf springs 26A and 26B are formed into substantially semicircular shapes. 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 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. 11B, the inner portions 26i of the lower leaf springs 26A and 26B include: 2 inner joining portions 26c that engage with the lens holding member 2, a first connecting portion 26p that connects the 2 inner joining portions 26c, and a web portion 26h that faces the extending portion 33 of the coil 3.

When the lower leaf springs 26A and 26B are assembled to the lens drive device 101, the 4 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 engagement 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 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 description of the lower leaf spring 26A is also applicable to the lower leaf spring 26B.

As shown in fig. 12A and 12B, when the lens driving device 101 is assembled, the connecting plate portion 26h of the inner portion 26i of the lower plate spring 26A faces the bank portion 82 of the lens holding member 2. That is, as shown in fig. 12A, the surface of the connecting plate portion 26h on the subject side (Z1 side) faces the housing portion 82s formed by the bank portion 82. As shown in fig. 12A, the first opposing portion 33c of the second extending portion 33B of the coil 3 extends between the surface of the inner portion 26i (the connecting plate portion 26h) of the lower leaf spring 26A on the subject side (Z1 side) and the surface of the lens holding member 2 on the imaging element side (Z2 side).

As shown in fig. 9B, the levee 82 includes: an inner wall portion 82u located on the center side of the lens holding member 2; an outer wall portion 82v located on the outer side opposite to the inner wall portion 82 u; and a side wall portion 82w located between the inner side wall portion 82u and the outer side wall portion 82v on a side close to the second holding portion 72B. As shown in fig. 9B, an opening 82z formed by cutting a wall portion is formed on the side of the bank portion 82 away from the second holding portion 72B. The accommodating portion 82s is formed by a space surrounded by 3 wall portions (the inner wall portion 82u, the outer wall portion 82v, and the side wall portion 82 w). The housing portion 82s is configured to be able to house the conductive adhesive CA that connects the second extending portion 33B of the coil 3 and the lower plate spring 26A. In the present embodiment, the bank portion 82 is formed at a position adjacent to the second holding portion 72B, and therefore the side wall of the second holding portion 72B is suitable as the side wall portion 82w of the bank portion 82. Therefore, the housing portion 82s is provided at a position adjacent to the second holding portion 72B.

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

The lower plate spring 26A and the second extending portion 33B of the coil 3 are electrically and physically connected to each other by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before the lower plate spring 26A is assembled to the lens holding member 2, the housing portion 82s surrounded by the bank portion 82 of the lens holding member 2 is filled with the conductive adhesive CA, and then the lower plate spring 26A is attached to the lens holding member 2. Then, the protruding portion 2t of the lens holding member 2 is heat-caulked, and the conductive adhesive CA is heat-cured. Before the conductive adhesive CA is filled into the housing portion 82s and is thermally cured, the lens holding member 2 is inverted so that the second holding portion 72B protrudes vertically upward. Therefore, even when the conductive adhesive CA has fluidity, the conductive adhesive CA can be appropriately held at a desired position (position in the housing portion 82 s). Since a part of the first opposing portion 33c is disposed in the housing portion 82s, it is embedded in the conductive adhesive CA. The conductive adhesive CA is not limited to a thermosetting type, and may be an ultraviolet-curable adhesive or a moisture-curable adhesive.

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 26 d. The through hole provided in the outer engagement portion 26d of the lower leaf spring 26A is fitted into the protruding portion 18t (see fig. 13) 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 plate springs 26A and 26B have a shape rotationally symmetrical 2 times with respect to the optical axis JD. The lower plate spring 26A is connected to the lens holding member 2 at 2 inner engaging portions 26c, and is connected to the base member 18 at 2 outer engaging portions 26 d. 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 a good balance in a state where the lens holding member 2 can be moved in the optical axis direction.

Next, details of stationary-side member RG will be described. The fixed-side member RG includes the spacer member 1 for fixing the upper leaf spring 16, the cover member 4, the magnetic field generating member 5, and the base member 18 for fixing each of the lower leaf springs 26A and 26B.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, as shown in fig. 13, the base member 18 is a member having a substantially 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 the drawings relating to the present embodiment, the protruding portion 18t is illustrated in a state in which the tip after being heat staked is deformed. The projection 18t may be fixed to the outer joint portion 26d by cold caulking.

As shown in fig. 13, the metal member 7 formed of a metal plate containing copper, iron, or an alloy containing these as a main component or the like is insert-molded and embedded in the base member 18.

The metal members 7 include first to third metal members 7A to 7C. The first metal member 7A has a connection portion 7AC exposed from the upper surface (surface on the Z1 side) of the base member 18, and the second metal member 7B has a connection portion 7BC exposed from the upper surface (surface on the Z1 side) of the base member 18. The surface of the connection portion 7AC and the surface of the connection portion 7BC are located on the same plane.

The connection portion 7AC is connected to the outer-side joining portion 26d of the lower leaf spring 26A via a conductive joining material in a state of facing the through hole 26dt (see fig. 11B) formed in the outer-side joining portion 26d of the lower leaf spring 26A. The conductive bonding material is, for example, solder, a conductive adhesive, or the like. In the present embodiment, the conductive bonding material is a conductive adhesive.

Similarly, the connection portion 7BC is connected to the outer-side joining portion 26d of the lower leaf spring 26B via a conductive joining material in a state of facing the through hole 26dt (see fig. 11B) formed in the outer-side joining portion 26d of the lower leaf spring 26B.

The first metal member 7A has a terminal portion 7AT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18, and the second metal member 7B has a terminal portion 7BT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18.

The third metal member 7C has end portions 7C 1-7C 4 protruding outward from the corner of the base member 18 in a direction perpendicular to the optical axis direction. As shown in fig. 2A and 2B, the end portions 7C1 to 7C4 are configured to contact the lower ends of the four corners of the cover member 4.

The base member 18 is positioned by combining the inner surface of the outer peripheral wall 4A of the cover member 4 and the outer peripheral surface of the base member 18, and then the end portions 7C1 to 7C4 are welded to the lower end portions of the four corners of the cover member 4, respectively, to be fixed to the cover member 4. The cover member 4 and base member 18 may also be secured at least in part with an adhesive.

Next, the upper assembly UA of the lens driving device 101 will be described with reference to fig. 14A to 14C and fig. 15A to 15C. The upper assembly UA is mainly composed of the spacer member 1, the cover member 4, the upper plate spring 16, and the magnetic field generating member 5. Fig. 14A to 14C and fig. 15A to 15C are views explaining an assembly procedure of the upper assembly UA. Specifically, fig. 14A is a perspective view of the cover member 4 in an inverted state, fig. 14B is a perspective view of the spacer member 1 in an inverted state, and fig. 14C is a perspective view of the cover member 4 with the spacer member 1 fitted therein. Fig. 15A is a perspective view of the cover member 4 into which the upper leaf spring 16 is further fitted, fig. 15B is a perspective view of the cover member 4 into which the second upper magnets 5BU are further fitted, and fig. 15C is a perspective view of the cover member 4 into which the second lower magnets 5BL are further fitted.

Fig. 15C shows a state where the upper assembly UA is completed. Thereafter, the upper assembly UA is assembled to the lower assembly. The lower assembly is mainly composed of the lens holding member 2, the coil 3, the lower plate spring 26, and the base member 18. The lower assembly corresponds to a structure in which the magnetic field generating member 5 and the upper leaf spring 16 are removed from the structure shown in fig. 4B.

As shown in fig. 14A, the upper assembly UA of the lens driving device 101 is typically assembled in a state where the cover member 4 is inverted, that is, in a state where the inner surface (Z2 side) of the top portion 4B faces upward. Then, the spacer member 1 is fitted into the cover member 4 as shown in fig. 14C in a state of being turned upside down as shown in fig. 14B.

The spacer member 1 is configured to be in contact with an outer portion 16e, which is a fixed side support portion of the upper leaf spring 16, and includes a frame-shaped portion 1C and a protruding portion 1P, as shown in fig. 14B. The frame-shaped portion 1C is a rectangular frame-shaped member configured to face the top portion 4B of the cover member 4, and includes first to fourth extending portions 1C1 to 1C4 extending along the first to fourth side plate portions 4a1 to 4a4 of the cover member 4, respectively. The protrusion 1P is configured to protrude downward (in the direction Z2) from the frame-shaped portion 1C, that is, in a direction away from the top portion 4B, and includes first to fourth protrusions 1P1 to 1P 4. The protruding portion 1P is configured to face the inner wall surface of the outer peripheral wall portion 4A of the cover member 4 when the spacer member 1 is fitted into the cover member 4.

Specifically, the spacer member 1 is disposed inside the cover member 4 such that the upper surface (surface on the Z1 side) of the frame-shaped portion 1C contacts the lower surface (surface on the Z2 side) of the top portion 4B of the cover member 4. In the present embodiment, the frame-shaped portion 1C of the spacer member 1 is fixed to the top portion 4B of the cover member 4 by adhesive.

More specifically, as shown in fig. 14C, the first protrusion 1P1 and the second protrusion 1P2 are configured to face the second side plate portion 4a 2. The third protrusion 1P3 and the fourth protrusion 1P4 are also not visible in fig. 14C, but are configured to face the first side plate portion 4a 1.

Thereafter, the upper leaf spring 16 is fitted into the cover member 4 in an inverted state as shown in fig. 15A. Specifically, the upper leaf spring 16 is disposed inside the cover member 4 such that the upper surface (surface on the Z1 side) of the horizontal portion 16r contacts the lower surface (surface on the Z2 side) of the frame-shaped portion 1C of the spacer member 1. In the present embodiment, the outer portion 16e of the upper leaf spring 16 is adhesively fixed to the frame portion 1C by an adhesive.

Next, the adhesive AD is applied to the inner walls of the first side plate portion 4a1 and the second side plate portion 4a 2. Specifically, as shown in fig. 15A, an adhesive AD for adhesively fixing the second magnetic-field-generating member 5B to the inner wall of the second side plate portion 4a2 is applied to the inner wall of the second side plate portion 4a 2. Although not visible in fig. 15A, an adhesive AD for adhesively fixing the first magnetic-field-generating member 5A to the inner wall of the first side plate portion 4a1 is also applied to the inner wall of the first side plate portion 4a 1.

In the present embodiment, the adhesive containing the adhesive AD is a thermosetting adhesive. However, the adhesive may be other adhesives such as a moisture curable adhesive and an ultraviolet curable adhesive.

Thereafter, as shown in fig. 15B, the second upper magnets 5BU of the second magnetic field generating member 5B are fitted into the cover member 4. Specifically, second upper magnet 5BU is fitted into a space between the inner wall of second side plate 4a2 and each of first protrusion 1P1 and second protrusion 1P 2. In the present embodiment, each of first projecting portion 1P1 and second projecting portion 1P2 is configured to be able to press second upper magnet 5BU against the inner wall of second side plate portion 4a2 when second upper magnet 5BU is fitted. That is, each of first projecting portion 1P1 and second projecting portion 1P2 is configured such that the space defined by first projecting portion 1P1, second projecting portion 1P2, and second side plate portion 4a2 can be slightly fitted to second upper magnet 5 BU. In fig. 15B, the same applies to the first upper magnet 5AU which is not visible.

Thereafter, the second lower magnet 5BL of the second magnetic field generating member 5B is fitted into the cover member 4, as shown in fig. 15C, similarly to the second upper magnet 5 BU. Specifically, second lower magnet 5BL is fitted into a space between the inner wall of second side plate 4a2 and each of first protrusion 1P1 and second protrusion 1P2 on the lower side (Z2 side) of second upper magnet 5 BU. In the present embodiment, the first protrusion 1P1 and the second protrusion 1P2 are configured to be able to press the second lower magnet 5BL against the inner wall of the second side plate portion 4a2 when the second lower magnet 5BL is fitted. That is, the first protrusion 1P1 and the second protrusion 1P2 are configured such that the space defined by the first protrusion 1P1, the second protrusion 1P2, and the second side plate 4a2 can be slightly fitted to the second lower magnet 5 BL. In fig. 15C, the same applies to the first lower magnet 5AL which is not visible.

Next, details of the protruding portion 1P of the spacer member 1 will be described with reference to fig. 16A and 16B. Fig. 16A and 16B are perspective views of the protruding portion 1P. Specifically, fig. 16A is a perspective view of second protrusion 1P2 when second protrusion 1P2 is viewed from the X1 side, and fig. 16B is a perspective view of second protrusion 1P2 when second protrusion 1P2 is viewed from the Y2 side. The following description of the second protrusion 1P2 applies similarly to each of the first protrusion 1P1, the third protrusion 1P3, and the fourth protrusion 1P 4.

As shown in fig. 16A and 16B, the second protrusion 1P2 has a first portion F1 facing the inner end surface (Y1 side) of the second magnetic-field-generating member 5B (see fig. 15C) and a second portion F2 facing the end surface at one end side (X2 side) of the second magnetic-field-generating member 5B. The second projecting portion 1P2 is formed to have a substantially L-shaped cross section parallel to the XY plane.

Specifically, the first portion F1 is configured to have a parallel portion PS and a tapered portion TS. The parallel portion PS is located closer to the root of the second protrusion 1P2 than the tapered portion TS, and is substantially parallel to the second side plate portion 4a 2. The tapered portion TS is located closer to the distal end side of the second projecting portion 1P2 than the parallel portion PS, and the distance between the tapered portion TS and the second side plate portion 4a2 increases toward the distal end side of the second projecting portion 1P 2. With this configuration, the second magnetic field generation member 5B is stably held in a state of surface contact with each of the parallel portion PS and the second side plate portion 4a 2.

The tapered portion TS facilitates fitting of the second magnetic-field-generating member 5B into the space between the parallel portion PS and the inner wall of the second side plate portion 4a 2. In the present embodiment, the second portion F2 is also configured to have a tapered portion on the tip end side, similarly to the first portion F1. However, the tapered portion TS may be omitted.

The second portion F2 is configured to have a convex portion PR that protrudes toward the second magnetic field generation member 5B. In the present embodiment, the convex portion PR is configured to be located on the base side of the second projecting portion 1P2 and to project toward the side end surface of the second magnetic-field-generating member 5B. With this configuration, the convex portion PR forms a gap for the adhesive AD to flow in between the side end surface of the second magnetic-field-generating member 5B and the second portion F2. That is, the protruding portion PR can prevent the side end surface of the second magnetic-field-generating member 5B from coming into close contact with the second portion F2 and closing the gap for the adhesive AD to flow into.

Next, the positional relationship between the projection 1P and the magnetic field generating member 5 will be described with reference to fig. 17A to 17D. Fig. 17A to 17D are views for explaining an assembly procedure of the upper assembly UA. Specifically, fig. 17A is a side view of the second protrusion 1P2 when the second protrusion 1P2 of the spacer member 1 fitted into the cover member 4, not shown, is viewed from the Y2 side. Fig. 17B is a side view of the second protrusion 1P2 of the spacer member 1 and the upper leaf spring 16 fitted into the unillustrated cover member 4, as viewed from the Y2 side. Fig. 17C is a side view of the second protrusion 1P2, the upper leaf spring 16, and the second upper magnet 5BU of the spacer member 1 fitted into the cover member 4, not shown, when viewed from the Y2 side. Fig. 17D is a side view of the second protrusion 1P2, the upper leaf spring 16, the second upper magnet 5BU, and the second lower magnet 5BL of the spacer member 1 fitted into the unillustrated cover member 4, as viewed from the Y2 side.

In the present embodiment, as shown in fig. 17C, the tip of the parallel portion PS is located below (on the Z2 side) the lower surface (surface on the Z2 side) of the second upper magnet 5BU by a distance D1. That is, the parallel portion PS is configured to contact a part of the inner end surface (Y1 side) of the second lower magnet 5BL disposed below (Z2 side) the second upper magnet 5 BU. In other words, the second projecting portion 1P2 is configured such that the boundary BD between the parallel portion PS and the tapered portion TS is located at a position facing the second lower magnet 5 BL. With this configuration, similarly to the second upper magnet 5BU, the second lower magnet 5BL is fixed to the inner wall of the second side plate portion 4a2 with a portion thereof sandwiched between the parallel portion PS of the second protrusion portion 1P2 and the inner wall of the second side plate portion 4a 2. That is, the parallel portion PS of the first portion F1 constituting the second projecting portion 1P2 can hold not only the second upper magnet 5BU but also the second lower magnet 5BL so as to be parallel to the inner wall of the second side plate portion 4a 2.

In the present embodiment, as shown in fig. 17D, the second protrusion 1P2 is configured such that the tip thereof is located above (on the Z1 side) the lower surface (surface on the Z2 side) of the second lower magnet 5BL by a distance D2. That is, the second projecting portion 1P2 is configured such that the length in the optical axis direction is shorter than the length of the second magnetic-field-generating member 5B. This is to save space. However, the second projecting portion 1P2 may be configured such that the length in the optical axis direction is equal to or greater than the length of the second magnetic-field-generating member 5B.

In the present embodiment, as shown in fig. 17C, the convex portion PR is configured to protrude from the surface of the second portion F2 on the X1 side by a width W1 in the X1 direction. With this configuration, the width W2 between the end surface of the second magnetic-field-generating member 5B on the X2 side and the surface of the second portion F2 on the X1 side is, as shown in fig. 17D, not less than the width W1, which is the amount of protrusion of the convex portion PR. Therefore, a sufficient gap for injecting the adhesive AD is ensured between the second magnetic-field-generating member 5B and the second portion F2 of the second protrusion 1P 2. As a result, the adhesive AD can flow into the gap formed between the second magnetic-field-generating member 5B and the second portion F2, and the second magnetic-field-generating member 5B and the second protrusion 1P2 can be reliably adhered and fixed.

Next, details of the upper assembly UA will be described with reference to fig. 18A and 18B. Fig. 18A and 18B are bottom views of the upper assembly UA. Specifically, fig. 18A is a bottom view of the entire upper assembly UA, and fig. 18B is an enlarged view of a portion R shown in fig. 18A.

As shown in fig. 18A, the magnetic field generating member 5 is located between the second portions F2 of the respective one of the pair of projections 1P. Specifically, the second magnetic field generation member 5B is located between the second portion F2 of the first protrusion 1P1 and the second portion F2 of the second protrusion 1P 2. The first magnetic field generating member 5A is located between the second portion F2 of the third protrusion 1P3 and the second portion F2 of the fourth protrusion 1P 4.

As shown in fig. 18B, an adhesive AD is disposed in a gap between one end of the magnetic field generating member 5 and the projection 1P. Specifically, the adhesive AD flows into the gap between the end surface of the second magnetic-field-generating member 5B on the X2 side and the surface of the second portion F2 constituting the second protrusion 1P2 on the X1 side. As shown in fig. 15A, the adhesive AD is also applied between the second magnetic-field-generating member 5B and the second side plate portion 4a 2. According to this configuration, the spacer member 1, the cover member 4, and the magnetic field generating member 5 are fixed by the adhesive AD and are fixed so as not to move relative to each other.

As described above, the lens driving device 101 of the present embodiment includes: a fixed-side member RG including the cover member 4; a lens holding member 2 which is positioned in the cover member 4 and can hold the lens body; a coil 3 held by the lens holding member 2; a magnetic field generating member 5 opposed to the coil 3; and an upper plate spring 16 that supports the lens holding member 2 so as to be movable in the optical axis direction. The upper leaf spring 16 has: an outer portion 16e serving as a fixed-side support portion fixed to the fixed-side member RG; an inner portion 16i as a movable side support portion fixed to the lens holding member 2; and an elastic arm portion 16g provided between the outer portion 16e and the inner portion 16 i. The cover member 4 has an outer peripheral wall portion 4A and a ceiling portion 4B including a pair of side plate portions opposed to each other, and is formed of a nonmagnetic material. The fixed-side member RG includes a spacer member 1, and the spacer member 1 is disposed so that a part thereof abuts against the top portion 4B of the cover member 4 and the outer portion 16e of the upper leaf spring 16 is fixed. The spacer member 1 includes a frame-shaped portion 1C facing the top portion 4B and a protruding portion 1P protruding downward (Z2 direction) from the frame-shaped portion 1C and facing the side plate portion. The magnetic field generating member 5 is shaped to extend in a direction orthogonal to the optical axis direction, and is fixed to the side plate portion while being sandwiched between the protruding portion 1P and the side plate portion. With this configuration, the lens driving device 101 can improve the ease of assembly when the magnetic field generating member 5 is fixed to the cover member 4 made of a nonmagnetic material. This is because, even when the cover member 4 is formed of a non-magnetic material, the magnetic field generating member 5 is held by the protruding portion 1P in a state of being sandwiched between the protruding portion 1P and the side plate portion.

The projection 1P preferably has a first portion F1 facing an inner surface (a surface facing the optical axis JD) of the magnetic field generation element 5 and a second portion F2 facing a side end surface of the magnetic field generation element 5. The magnetic field generating member 5 is disposed so as to be positioned between the second portions F2 of the pair of projections 1P. For example, as shown in fig. 16A and 16B, the second protrusion 1P2 has a first portion F1 facing the inner surface (Y1 side) of the second magnetic-field-generating member 5B and a second portion F2 facing the side end surface (X2 side surface) of the second magnetic-field-generating member 5B. Further, as shown in fig. 18A, the second magnetic field generation member 5B is disposed so as to be located between the second portion F2 of the first protrusion 1P1 and the second portion F2 of the second protrusion 1P 2. According to this structure, the first protrusion 1P1 and the second protrusion 1P2 can suppress the movement of the second magnetic field generation member 5B in the extending direction (X-axis direction). For example, when the upper assembly UA is assembled, the first protrusion 1P1 and the second protrusion 1P2 can prevent the second magnetic-field-generating member 5B held in parallel with the second side plate portion 4a2 from moving in the X-axis direction.

The projection 1P is preferably formed in an L-shaped cross section. For example, as shown in fig. 16A and 16B, the first portion F1 and the second portion F2 are integrally formed in the second protrusion 1P2 so that a cross section parallel to the XY plane is substantially L-shaped. With this structure, the highly rigid protrusion 1P including the first portion F1 and the second portion F2 is formed.

The magnetic field generating member 5 is preferably composed of a first magnet and a second magnet. The first magnet is disposed on the side closer to the frame-shaped portion 1C than the second magnet, and the second magnet is disposed on the side farther from the frame-shaped portion 1C than the first magnet. For example, as shown in fig. 15C, the second magnetic field generating member 5B is composed of a second upper magnet 5BU as a first magnet disposed on a side (Z1 side) closer to the frame-shaped portion 1C constituting the spacer member 1, and a second lower magnet 5BL as a second magnet disposed on a side (Z2 side) farther from the frame-shaped portion 1C. In this configuration, the coil 3 has an elliptical shape having a coil axis perpendicular to the optical axis direction, as shown in fig. 5B, for example. The first magnet and the second magnet have different magnetic poles between an inner surface facing the coil 3 and an outer surface facing the side plate portion. The inner surface of the first magnet and the inner surface of the second magnet have different magnetic poles. For example, as shown in fig. 1, the first upper magnet 5AU as the first magnet has an inner surface facing the coil 3 magnetized to the S-pole and an outer surface facing the first side plate portion 4a1 magnetized to the N-pole. The first lower magnet 5AL as the second magnet has an inner surface facing the coil 3 magnetized to the N-pole and an outer surface facing the first side plate portion 4a1 magnetized to the S-pole. That is, the inner surface (south pole) of the first upper magnet 5AU as the first magnet and the inner surface (north pole) of the first lower magnet 5AL as the second magnet have different magnetic poles. Similarly, second upper magnet 5BU as the first magnet has an inner surface facing coil 3 magnetized to the S-pole and an outer surface facing second side plate portion 4a2 magnetized to the N-pole. The second lower magnet 5BL as the second magnet has an inner surface facing the coil 3 magnetized to the N-pole and an outer surface facing the second side plate portion 4a2 magnetized to the S-pole. That is, the inner surface (S pole) of the second upper magnet 5BU as the first magnet and the inner surface (N pole) of the second lower magnet 5BL as the second magnet have different magnetic poles. The tip of the projection 1P is located closer to the second magnet than the boundary between the first magnet and the second magnet. For example, as shown in fig. 17C and 17D, the second protrusion 1P2 has its tip located on the second lower magnet 5BL side (i.e., on the Z2 side) with respect to the boundary between the second upper magnet 5BU as the first magnet and the second lower magnet 5BL as the second magnet. In this way, even when the magnetic field generating member 5 is formed of 2 magnets that overlap in the optical axis direction, the spacer member 1 can sandwich the 2 magnets between the protruding portion 1P and the side plate portion.

The first portion F1 of the projection 1P preferably has: a parallel portion PS located on the root side of the projection 1P and substantially parallel to the side plate portion; and a tapered portion TS located closer to the distal end side of the protruding portion 1P than the parallel portion PS, the distance between the tapered portion TS and the side plate portion increasing toward the distal end side of the protruding portion 1P. The boundary BD between the parallel portion PS and the tapered portion TS is preferably configured to face the second magnet. For example, as shown in fig. 16A and 16B, the first portion F1 of the second protrusion 1P2 includes: a parallel portion PS located closer to the root of the second projecting portion 1P2 than the tapered portion TS and substantially parallel to the second side plate portion 4a 2; and a tapered portion TS located closer to the distal end side of the second projecting portion 1P2 than the parallel portion PS, the distance between the tapered portion TS and the second side plate portion 4a2 increasing toward the distal end side of the second projecting portion 1P 2. As shown in fig. 17C and 17D, the boundary BD between the parallel portion PS and the tapered portion TS is located at a position facing the second lower magnet 5BL as the second magnet, that is, at a position lower (on the Z2 side) than the lower surface (the surface on the Z2 side) of the second upper magnet 5BU as the first magnet by a distance D1. According to this configuration, the magnetic field generating member 5 is guided by the tapered portion TS during assembly, and is easily fitted into the space between the protruding portion 1P and the side plate portion of the outer peripheral wall portion 4A. After being fitted between the protruding portion 1P and the side plate portion, the magnetic field generating member 5 is also supported by the parallel portion PS parallel to the side plate portion, and is thus held in a state parallel to the side plate portion. That is, the parallel portion PS can suppress the inclination of the magnetic field generating member 5 with respect to the side plate portion. Therefore, the first magnet and the second magnet constituting the magnetic field generating member 5 are disposed at desired positions between the protruding portion 1P and the side plate portions in desired postures. As a result, the lens driving device 101 can prevent the positional relationship between the coil 3 and the magnetic field generating member 5 from being deviated, and can prevent the thrust for driving the lens holding member 2 from being deviated.

A projection PR projecting toward the magnetic field generating member 5 is preferably formed at the root of the second portion F2 of the projection 1P. An adhesive AD is disposed between the second portion F2 on the lower side (Z2 side) of the projection PR and the magnetic field generating member 5. For example, as shown in fig. 17D, a convex portion PR that protrudes toward the second magnetic field generation member 5B is formed at the root of the second portion F2 of the second protrusion portion 1P 2. An adhesive AD is disposed between the second portion F2 on the lower side (Z2 side) of the projection PR and the second magnetic field generating member 5B. According to this structure, at least a gap having a width W2 wider than the width W1 of the projection PR is formed between the second portion F2 of the second protrusion 1P2 and the second magnetic field generation member 5B. Therefore, the adhesive AD can reliably flow into the gap between the second portion F2 and the second magnetic-field-generating member 5B. As a result, the adhesive strength between the second projecting portion 1P2 and the second magnetic-field-generating member 5B can be reliably increased.

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 coil 3 is constituted by 2 elliptical (elliptical) coils each having a coil axis perpendicular to the optical axis direction, which are held by 2 of the 4 side surfaces of the lens holding member 2. However, the present invention is not limited to this configuration. The coil 3 may be an annular coil wound around the lens holding member 2 so as to have a coil axis extending in the optical axis direction. In this case, the magnetic field generating member 5 may be configured by 4 dipolar magnets arranged to face each of the 4 side plate portions configuring the outer peripheral wall portion 4A.

In the above embodiment, the first magnetic field generating member 5A is constituted by a combination of the first upper magnet 5AU and the first lower magnet 5AL magnetized in the direction perpendicular to the optical axis JD, but may be constituted by 1 dipolar magnet magnetized in the optical axis direction. In this case, the magnetic poles of the upper part of the secondary magnet correspond to the magnetic poles of the inner part of the first upper magnet 5AU, and the magnetic poles of the lower part correspond to the magnetic poles of the inner part of the first lower magnet 5 AL. The same applies to the second magnetic field generating member 5B.

In the above embodiment, the magnetic field generating member 5 has a substantially rectangular parallelepiped shape and is disposed so as to face the side plate portion constituting the outer peripheral wall portion 4A, but may have a prism shape having a trapezoidal bottom surface and be disposed so as to face the four corners of the outer peripheral wall portion 4A.

In addition, in the above embodiment, the protrusion 1P in the spacer member 1 is configured to integrally include the first portion F1 and the second portion F2. However, the first portion F1 and the second portion F2 may be configured to extend from the frame-shaped portion 1C, respectively, and be disposed at a distance from each other. In this case, the second portion F2 may also be omitted. That is, the magnetic-field-generating member 5 may be held between the 1 or more first portions F1 and 1 of the side plate portions in the outer peripheral wall portion 4A by a force with which the 1 or more first portions F1 press the magnetic-field-generating member 5 against the 1 of the side plate portions. In this way, the number of the 1 first portions F1 for holding the magnetic field generating members 5 may be 1, or 3 or more. In the case where 1 magnetic field generation member 5 is held by 1 first portion F1, first portion F1 may be disposed so as not to contact with the end portions of magnetic field generation member 5, but to contact with the central portion of magnetic field generation member 5.

The present application claims priority based on japanese patent application No. 2019-138267, filed on 26.7.2019, the entire contents of which are incorporated by reference into the present application.

Description of the reference numerals

Spacer 1C frame-like portion 1C first extension portion 1C second extension portion 1C third extension portion 1C fourth extension portion 1P projection first projection 1P second projection 1P third projection 1P fourth projection 1P lens holding member 2t projection 3 coil 3A first coil 3B second coil 3C coupling portion 4 cover member 4A outer peripheral wall portion 4A first side plate portion 4A second side plate portion 4A third side plate portion 4A fourth side plate portion 4B top portion 4s housing 5 magnetic field generating member 5A first upper magnet 5AU first lower magnet 5B second magnetic field generating member 5BU second upper magnet 5BL second lower magnet 6 leaf spring 7A first metal member 7AC coupling portion 7AT 7A second metal member 7B BC coupling portion 7BT Terminal portion 7C, third metal member 7C to 7C, end portion 12 tubular portion 12d, pedestal portion 12dh recessed portion 12p winding projection 12pA first winding projection 12pB second winding projection 13 winding portion 16 upper side leaf spring 16B corner portion 16e outer side portion 16e inner side portion 16i elastic arm portion 16r cross bar portion 18 base member 18k opening 18t protruding portion 26, 26A, 26B lower side leaf spring 26C inner side engaging portion 26d outer side portion 26e elastic arm portion 26h connecting plate portion 26i inner side portion 26p first connecting portion 33 q second connecting portion 33 extending portion 33A first extending portion 33B second extending portion 33C first opposing portion 33k second opposing portion 33m winding portion 72 holding portion 72A first holding portion 72B second holding portion 82 protruding portion 82s holding portion 82u inner side portion 82v outer side portion 82w … side wall 82z … open 101 … lens driving device AD … adhesive BD … boundary CA … conductive adhesive F1 … first portion F2 … second portion JD … optical axis MK … drive mechanism PR … convex portion PS … parallel portion RG … fixed side member TS … taper portion UA … upper assembly.

Claims (8)

1. A lens driving device is characterized by comprising:

a stationary-side member including a cover member;

a lens holding member which is positioned in the cover member and can hold the lens body;

a coil held by the lens holding member;

a magnetic field generating member opposed to the coil; and

a leaf spring having: a fixed-side support portion fixed to the fixed-side member; a movable side support part fixed to the lens holding member; and an elastic arm portion provided between the fixed-side support portion and the movable-side support portion and supporting the lens holding member to be movable in an optical axis direction,

the cover member has an outer peripheral wall portion including a pair of side plate portions opposed to each other and a top portion, and is formed of a non-magnetic material,

the fixed-side member includes a spacer member, a part of which is disposed in contact with the cover member and to which the fixed-side support portion of the leaf spring is fixed,

the spacer member has: a frame-shaped portion opposed to the top portion; and a protruding portion protruding downward from the frame-shaped portion and facing the side plate portion,

the magnetic field generating member is shaped to extend in a direction orthogonal to the optical axis direction, and is fixed to the side plate portion in a state of being sandwiched between the protruding portion and the side plate portion.

2. The lens driving device according to claim 1,

the protrusion has a first portion facing an inner surface of the magnetic field generation member and a second portion facing a side end surface of the magnetic field generation member,

the magnetic field generating member is disposed so as to be located between the second portions of the pair of projections, respectively.

3. The lens driving device according to claim 2,

the protruding portion is formed in an L-shaped cross section.

4. The lens driving device according to claim 2 or 3,

the magnetic field generating member is composed of a first magnet and a second magnet,

the first magnet is arranged on one side close to the frame-shaped part, the second magnet is arranged on one side far away from the frame-shaped part,

the coil has a shape having a coil axis perpendicular to the optical axis direction,

the first magnet and the second magnet have different magnetic poles between an inner surface facing the coil and an outer surface facing the side plate,

the inner surface of the first magnet and the inner surface of the second magnet have different magnetic poles,

the protruding portion is configured such that a tip thereof is positioned closer to the second magnet than a boundary between the first magnet and the second magnet.

5. The lens driving device according to claim 4,

the first portion has:

a parallel portion located on a root side of the protruding portion and substantially parallel to the side plate portion; and

a tapered portion located on a leading end side of the protruding portion than the parallel portion, and a distance between the tapered portion and the side plate portion increases toward the leading end side of the protruding portion,

the boundary between the parallel portion and the tapered portion is located at a position facing the second magnet.

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

a projection projecting toward the magnetic field generating member is formed at a root portion of the second portion,

an adhesive is disposed between the second portion on the lower side of the convex portion and the magnetic field generation member.

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

the magnetic field generating member is substantially rectangular parallelepiped and is disposed so as to face the side plate portion.

8. A camera module has;

the lens driving device according to any one of claims 1 to 7;

the lens body; and

and an imaging element facing the lens body.

Images