CN116736469A - Lens driving device and camera module - Google Patents

Abstract

Provided are a lens driving device and a camera module, which can generate enough driving force (thrust force) even when a cover member is formed by a non-magnetic material. A lens driving device (100) is provided with: a Housing (HS) including a base member (18) and a cover member (4) made of a nonmagnetic material; a lens holding member (2) disposed in the Housing (HS); a coil (3) fixed to the lens holding member (2); a magnet (5) which is fixed to the inner surface of the cover member (4) so as to face the coil (3); and an upper plate spring (16) and a lower plate spring (26) that support the lens holding member (2) so as to be movable in the optical axis direction. The magnet (5) is fixed to the inner surface of the cover member (4) such that the upper surface is located above the upper plate spring (16) and the lower surface is located below the lower plate spring (26).

Description

Lens driving device and camera module

Technical Field

The present disclosure relates to a lens driving device mounted on a portable device with a camera or the like, and a camera module including the lens driving device.

Background

Conventionally, a lens driving apparatus is known, which includes: a cover member formed of a non-magnetic material; a lens holding member disposed in the cover member and capable of holding the lens body; a coil fixed to the lens holding member; a magnet facing the coil and fixed to an inner surface of the cover member; and a leaf spring that supports the lens holding member so as to be movable in the optical axis direction (see patent document 1). In this device, a driving force (thrust force) for moving the lens holding member in the optical axis direction is electromagnetically generated by a driving section composed of a magnet and a coil.

Patent document 1: international publication No. 2018/043132

However, in this device, since the cover member is formed of a nonmagnetic material, there is a possibility that the driving force (thrust) is insufficient due to the weight of the lens body.

Disclosure of Invention

Accordingly, it is desirable to provide a lens driving device capable of generating a sufficient driving force (thrust force) even in the case where the cover member is formed of a non-magnetic material.

The lens driving device according to an embodiment of the present invention includes: a frame body including a base member and a cover member formed of a nonmagnetic material; a lens holding member which is disposed in the housing and can hold the lens body; a coil fixed to the lens holding member; a magnet which is fixed to the inner surface of the cover member so as to face the coil; and an upper leaf spring and a lower leaf spring, the upper leaf spring having an upper movable side support portion fixed to an upper portion of the lens holding member, an upper fixed side support portion fixed to the cover member, and an elastic arm portion provided between the upper movable side support portion and the upper fixed side support portion, the lower leaf spring having a lower movable side support portion fixed to a lower portion of the lens holding member, a lower fixed side support portion fixed to the base member, and an elastic arm portion provided between the lower movable side support portion and the lower fixed side support portion, an upper surface of the magnet being positioned above the upper leaf spring, and a lower surface of the magnet being positioned below the lower leaf spring.

Effects of the invention

The lens driving device described above can generate a sufficient driving force (thrust force) even when the cover member is formed of a nonmagnetic material.

Drawings

Fig. 1 is a perspective view of a lens driving apparatus.

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

Fig. 3A is a perspective view of the lens holding member.

Fig. 3B is a perspective view of the lens holding member with the coil and the upper plate spring attached.

Fig. 3C is a perspective view of the bottom surface of the lens holding member to which the coil and the lower leaf spring are attached.

Fig. 4A is a bottom view of the lens holding member with the coil mounted.

Fig. 4B is a bottom view of a portion of the lens holding member with the coil mounted.

Fig. 5A is a top view of the upper leaf spring.

Fig. 5B is a top view of the lower leaf spring.

Fig. 6 is a perspective view of a member constituting a part of the fixed-side member.

Fig. 7 is a diagram illustrating an assembly sequence of the upper assembly.

Fig. 8 is a diagram illustrating an assembly sequence of the lens driving apparatus.

Fig. 9A is a perspective view of the lens driving apparatus in a state in which the lower cover member is detached.

Fig. 9B is a front view of the lens driving apparatus.

Fig. 9C is a left side view of the lens driving apparatus.

Fig. 10 is a cross-sectional view of the cover member, the magnet, and the base member.

Description of symbols

2: a lens holding member; 2K: a through hole; 2T: a protruding setting part; 3: a coil; 3C: a connecting part; 4: a cover member; 4A: an outer peripheral wall portion; 4A1: a1 st side plate portion; 4A2: a2 nd side plate portion; 4A3: a3 rd side plate portion; 4A4: a4 th side plate portion; 4B: a top plate portion; 4C: a step portion; 4C1: a1 st step portion; 4C2: a2 nd step portion; 4C3: a3 rd step portion; 4C4: a4 th step portion; 4S: a storage section; 5: a magnet; 5A: a1 st magnet; 5AL: a1 st lower magnet; 5AU: a1 st upper magnet; 5B: a2 nd magnet; 5BL: a2 nd lower magnet; 5BU: a2 nd upper magnet; 6: a leaf spring; 7: a metal component; 7A: a1 st metal part; 7AC: a connection part; 7AT: a terminal portion; 7B: a2 nd metal member; 7BC: a connection part; 7BT: a terminal portion; 7C: a3 rd metal part; 7CP: an end portion; 7CT: a terminal portion; 7D: a4 th metal part; 7DP: an end portion; 7E: a 5 th metal part; 7EP: an end portion; 7F: a 6 th metal member; 7FP: an end portion; 12: a cylindrical portion; 12D: a base portion; 12H: a concave portion; 12P: a protrusion; 12PA: 1 st projection; 12PB: a2 nd protrusion; 13: a winding part; 13A: a1 st winding part; 13B: a2 nd winding part; 16: an upper leaf spring; 16b: a corner portion; 16e: an outer portion; 16g: an elastic arm portion; 16i: an inner portion; 16r: a stack portion; 18: a base member; 18E: an outer peripheral side portion; 18G: a concave portion; 18GL: a left concave portion; 18GR: a right concave portion; 18K: an opening; 18S: a convex portion; 18T: a protruding setting part; 18W: a wall portion; 18WB: a rear side wall portion; 18WF: a front side wall portion; 18WL: a left side wall portion; 18WR: a right side wall portion; 26: a lower leaf spring; 26A: a1 st lower leaf spring; 26B: a2 nd lower leaf spring; 26c: an inner joining portion; 26d: an outer joining portion; 26dt: a through hole; 26e: an outer portion; 26g: an elastic arm portion; 26h: a connection plate portion; 26i: an inner portion; 26p: a connecting part; 33: an extension; 33A: a1 st extension; 33B: a2 nd extension; 33c: an opposing portion; 33m: a winding part; 72: a holding section; 72A: a1 st holding part; 72B: a2 nd holding part; 82: a jetty part; 82s: a storage section; 82u: an inner side wall portion; 82v: an outer side wall portion; 82w: a side wall portion; 82z: an opening portion; 100: a lens driving device; AD1 to AD4: an adhesive; CU: a notch portion; CU1: a1 st cutout portion; CU2: a2 nd notch portion; CU3: a3 rd notch portion; CU4: a4 th cutout portion; DM: a driving section; and (B): a fixed side member; HS: a frame; LA: a lower assembly; OA: an optical axis; UA: an upper assembly; VC: a vibration damping member; WM: and welding metal.

Detailed Description

Hereinafter, a lens driving device 100 as an example of an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a lens driving apparatus 100. Fig. 2 is an exploded perspective view of the lens driving device 100.

In fig. 1 and 2, X1 represents one direction of an X axis constituting a three-dimensional rectangular coordinate system, and X2 represents the other direction of the X axis. Further, Y1 represents one direction of the Y axis constituting the three-dimensional rectangular coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional rectangular coordinate system, and Z2 represents the other direction of the Z axis. In fig. 1 and 2, the X1 side of the lens driving device 100 corresponds to the front side (front side) of the lens driving device 100, and the X2 side of the lens driving device 100 corresponds to the rear side (back side) of the lens driving device 100. The Y1 side of the lens driving device 100 corresponds to the left side of the lens driving device 100, and the Y2 side of the lens driving device 100 corresponds to the right side of the lens driving device 100. The Z1 side of the lens driving apparatus 100 corresponds to the upper side (object side) of the lens driving apparatus 100, and the Z2 side of the lens driving apparatus 100 corresponds to the lower side (image pickup device side) of the lens driving apparatus 100. The same applies to the other figures.

As shown in fig. 2, the lens driving apparatus 100 includes: the lens driving device includes a lens holding member 2 capable of holding a lens body (not shown), a driving portion DM that generates a driving force (thrust force) for moving the lens holding member 2 in an optical axis direction (Z axis direction), a leaf spring 6 that supports the lens holding member 2 so as to be movable in the optical axis direction, a fixing side member FB that fixes the leaf spring 6, and a metal member 7 that realizes electrical connection between an external power source and the lens driving device 100. The lens is, for example, a cylindrical lens barrel having at least one lens, and is configured such that its central axis is along the optical axis direction. The "optical axis direction" includes a direction of the optical axis OA associated with the lens body and a direction parallel to the optical axis OA.

As shown in fig. 2, the driving unit DM includes: a coil 3 having two elliptical-shaped winding portions 13 (1 st winding portion 13A and 2 nd winding portion 13B) which are held at two opposite side portions out of 4 side portions of the lens holding member 2 having an approximately rectangular parallelepiped outer shape; and a magnet 5 disposed opposite to the coil 3 in the radial direction (direction perpendicular to the optical axis OA). In fig. 2, the winding portion 13 is not shown in detail of the winding state of the conductive wire material covered with the insulating member. The same applies to the other drawings illustrating the winding portion 13.

The cover member 4 is a cylindrical outer case made of a nonmagnetic material, and constitutes a part of the fixed-side member FB. In the illustrated example, the cover member 4 is manufactured by subjecting a plate material made of austenitic stainless steel to punching, drawing, or the like.

Specifically, as shown in fig. 1, the cover member 4 includes a rectangular tubular outer peripheral wall portion 4A and a rectangular annular top plate portion 4B provided continuously with an upper end (end on the Z1 side) of the outer peripheral wall portion 4A, and forms a housing portion 4S. A circular opening is formed in the center of the top plate 4B. Further, the top plate portion 4B has 4 stepped portions 4C formed at each of the 4 corner portions. The 4 step portions 4C are formed to be recessed downward (Z2 direction), and include 1 st to 4 th step portions 4C1 to 4 th step portions 4C4.

The outer peripheral wall portion 4A includes 1 st side plate portion 4A1 to 4 th side plate portion 4A4. The 1 st side plate portion 4A1 and the 3 rd side plate portion 4A3 are opposed to each other to constitute a pair of side plate portions. Similarly, the 2 nd side plate portion 4A2 and the 4 th side plate portion 4A4 are formed as the other pair of side plate portions facing each other. The 1 st side plate portion 4A1 and the 3 rd side plate portion 4A3 are perpendicular to the 2 nd side plate portion 4A2 and the 4 th side plate portion 4A4.

As shown in fig. 2, a plurality of notch portions CU are formed in the lower portion of the outer peripheral wall portion 4A. Specifically, 4 1 st cutout portions CU1 are formed in the lower portion of the 1 st side plate portion 4A1, 4 2 nd cutout portions CU2 are formed in the lower portion of the 2 nd side plate portion 4A2, 4 3 rd cutout portions CU3 are formed in the lower portion of the 3 rd side plate portion 4A3, and 4 th cutout portions CU4 are formed in the lower portion of the 4 th side plate portion 4A4.

The cover member 4 thus configured accommodates the lens holding member 2, the coil 3, the magnet 5, and the leaf spring 6 in the accommodation portion 4S, and as shown in fig. 1, the cover member 4 is coupled to the base member 18, and constitutes the housing HS together with the base member 18.

The magnet 5 constitutes a part of the driving section DM. In the illustrated example, the magnet 5 includes a 1 st magnet 5A disposed to face the 2 nd side plate portion 4A2 and A2 nd magnet 5B disposed to face the 4 th side plate portion 4 A4.

The 1 st magnet 5A is composed of a combination of two permanent magnets (dipole magnets) polarized in the radial direction. Fig. 2 shows the N pole by cross hatching, and the S pole by diagonal hatching. The combination of two diode magnets has an advantage that leakage of the magnetic field to the outside of the cover member 4 can be suppressed more reliably than one diode magnet, one quadrupole magnet, or the like polarized in the optical axis direction. However, the 1 st magnet 5A may be constituted by one diode magnet or one quadrupole magnet. The same applies to the 2 nd magnet 5B.

Specifically, as shown in fig. 2, the 1 st magnet 5A includes a 1 st upper magnet 5AU and a 1 st lower magnet 5AL. The 2 nd magnet 5B includes a2 nd upper magnet 5BU and a2 nd lower magnet 5BL. The 1 st upper magnet 5AU, the 1 st lower magnet 5AL, the 2 nd upper magnet 5BU, and the 2 nd lower magnet 5BL each have a substantially rectangular parallelepiped shape.

Further, the magnets 5 are arranged outside the coil 3 (winding portion 13) and along both sides of the outer peripheral wall portion 4A of the cover member 4. The magnet 5 is fixed to the inner surface of the outer peripheral wall portion 4A by an adhesive AD2 (see fig. 7). Specifically, the 1 st upper magnet 5AU and the 1 st lower magnet 5AL are positioned outside the 1 st winding portion 13A and fixed to the inner surface of the 2 nd side plate portion 4 A2. The 2 nd upper magnet 5BU and the 2 nd lower magnet 5BL are positioned outside the 2 nd winding portion 13B and fixed to the inner surface of the 4 th side plate portion 4 A4.

The leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the cover member 4, and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. The lower plate spring 26 includes a 1 st lower plate spring 26A and a2 nd lower plate spring 26B.

The fixed-side member FB includes the cover member 4 and the base member 18 embedded in the metal member 7.

The lens driving device 100 is mounted on a substrate (not shown) having a substantially rectangular parallelepiped shape and mounted with an imaging element (not shown). The camera module is constituted by a substrate, a lens driving device 100, a lens body attached to the lens holding member 2, and an imaging element attached to the substrate so as to face the lens body. The coil 3 is connected to an external power source via the lower leaf spring 26, the metal member 7, and the substrate. When a current flows in the coil 3, the driving section DM electromagnetically generates a driving force (thrust) in the optical axis direction.

The lens driving device 100 realizes an autofocus adjustment function by moving the lens holding member 2 in the optical axis direction on the Z1 side (object side) of the imaging element by the driving force. Specifically, the lens driving device 100 can move the lens holding member 2 in a direction away from the imaging element to perform macro imaging, and can move the lens holding member 2 in a direction approaching the imaging element to perform infinity imaging.

Next, the lens holding member 2 will be described with reference to fig. 3A to 3C, 4A, and 4B. Fig. 3A is a perspective view of the lens holding member 2. Fig. 3B shows a state in which the coil 3 and the upper plate spring 16 are mounted on the lens holding member 2 of fig. 3A. Fig. 3C is a perspective view of the bottom surface of the lens holding member 2, showing a state in which the coil 3 and the lower plate spring 26 are attached to the lens holding member 2. Fig. 4A is a bottom view of the lens holding member 2, and fig. 4B is an enlarged view of a portion R1 surrounded by a broken line in fig. 4A. In fig. 3B and 3C, dot patterns are marked on the coil 3 and the leaf spring 6 for clarity. In fig. 4B, a dot pattern is marked on the coil 3 for clarity.

In the illustrated example, 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. 3A, the lens holding member 2 includes a cylindrical portion 12 in which a through hole 2K extending in the optical axis direction is formed.

A spiral groove is provided on the cylindrical inner peripheral surface of the cylindrical portion 12 so that an adhesive can be filled between the inner peripheral surface and the lens body. Further, an annular pedestal portion 12D is provided in the cylindrical portion 12, and the annular pedestal portion 12D has 4 concave portions 12H on the end surface on the object side. As shown in fig. 3B, an annular inner portion 16i constituting the upper plate spring 16 is placed on the pedestal portion 12D.

As shown in fig. 3A, a protrusion 12P for holding the coil 3 is provided on the outer peripheral surface of the cylindrical portion 12. In the illustrated example, the protrusion 12P protrudes radially outward from the outer peripheral surface of the cylindrical portion 12 and has a substantially rectangular parallelepiped shape so that a conductive wire is wound around the coil axis CX perpendicular to the optical axis direction. Specifically, the protrusions 12P are disposed on two outer surfaces of the lens holding member 2 that face each other. In the illustrated example, the projection 12P includes a 1 st projection 12PA disposed on the outer side surface on the Y1 side and a2 nd projection 12PB disposed on the outer side surface on the Y2 side.

As shown in fig. 3B, the winding portion 13 of the coil 3 is formed by winding a conductive wire around the protrusion 12P. Specifically, the winding portion 13 includes a 1 st winding portion 13A (see fig. 3B) disposed so as to face the 2 nd side plate portion 4A2, and A2 nd winding portion 13B (see fig. 3C) disposed so as to face the 4 th side plate portion 4 A4. The 1 st winding portion 13A and the 2 nd winding portion 13B are connected by a connecting portion 3C. The 1 st winding portion 13A is wound around the 1 st projection 12PA (see fig. 3B), and the 2 nd winding portion 13B is wound around the 2 nd projection 12PB (see fig. 3C). In the example shown in the figure, the winding portion 13 is fixed to the protrusion 12P without using an adhesive, but may be fixed to the protrusion 12P using an adhesive. The winding direction of the winding portion 13 is arbitrary and is determined, for example, by the arrangement (magnetization direction) of the magnets 5. The winding portion 13 may be attached to the protrusion 12P in a wound state.

As shown in fig. 3C, the lens holding member 2 includes two holding portions 72 which are square protruding portions protruding downward (Z2 direction) from the end surface on the imaging element side (Z2 side), and 4 protruding setting portions 2T which are circular protruding portions.

As shown in fig. 4A, the holding portion 72 includes a 1 st holding portion 72A around which one end of the wire material constituting the coil 3 is wound, and a 2 nd holding portion 72B around which the other end of the wire material constituting the coil 3 is wound. Thus, both ends of the wire material constituting the coil 3 are wound around and held by the holding portion 72.

As shown in fig. 3C, the projection 2T includes two projection 2T corresponding to the 1 st lower plate spring 26A and two projection 2T corresponding to the 2 nd lower plate spring 26B. The inner portions 26i as lower movable side supporting portions of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are attached and fixed to the protruding portion 2T. The inner portions 26i of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are fixed by heat staking the protruding portions 2T inserted into the through holes formed in the inner portions 26i. In fig. 3C, the protruding portion 2T is shown in a state in which the tip after heat staking is deformed. The same applies to the other drawings.

Next, the driving unit DM of the lens driving device 100 will be described. As shown in fig. 2, the driving unit DM includes a coil 3 and a magnet 5. Specifically, the coil 3 includes a 1 st winding portion 13A disposed so as to face the 2 nd side plate portion 4A2, and A2 nd winding portion 13B disposed so as to face the 4 th side plate portion 4 A4. The magnet 5 includes a 1 st magnet 5A adhesively fixed to the inner surface of the 2 nd side plate portion 4A2, and A2 nd magnet 5B adhesively fixed to the inner surface of the 4 th side plate portion 4 A4. The driving unit DM generates 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.

As shown in fig. 4A, the extension portion 33 of the coil 3 includes a 1 st extension portion 33A connected to the 1 st winding portion 13A at one end side of the wire rod constituting the coil 3, and a2 nd extension portion 33B connected to the 2 nd winding portion 13B at the other end side of the wire rod constituting the coil 3.

Specifically, as shown in fig. 4B, the 1 st extending portion 33A includes a winding portion 33m wound around the 1 st holding portion 72A, and an opposing portion 33c extending so as to oppose the bottom surface (Z2-side surface) of the lens holding member 2. The same applies to the 2 nd extension 33B.

In the illustrated example, the 1 st extending portion 33A is wound around the 1 st holding portion 72A of the lens holding member 2 before the wire of the coil 3 is wound around the outer periphery of the 1 st projection 12 PA. In the example shown in fig. 4B, a part of the wire of the coil 3 is wound three turns around the 1 st holding portion 72A. Thereby, the winding portion 33m is formed in the 1 st holding portion 72A, and a part of the 1 st extending portion 33A is held in the 1 st holding portion 72A.

Next, the wire is wound around the outer periphery of the 1 st projection 12 PA. At this time, as shown in fig. 4B, the wire of the 1 st projection 12PA extends from the winding portion 33m so as to face the bottom surface of the lens holding member 2. The portion facing the bottom surface of the lens holder 2 constitutes a facing portion 33c of the 1 st extending portion 33A.

In the 1 st projection 12PA, after the 1 st winding portion 13A is formed, the wire drawn out from the 1 st winding portion 13A is wound around the outer periphery of the 2 nd projection 12 PB. When the winding of the wire rod around the outer periphery of the 1 st projection 12PA and the winding of the wire rod around the outer periphery of the 2 nd projection 12PB are completed, as shown in fig. 4A, the 2 nd extension portion 33B connected to the other end of the wire rod constituting the coil 3 is drawn out from the right side surface (Y2 surface) side to the bottom surface (Z2 surface) side of the lens holding member 2. Specifically, the opposing portion 33c extends to oppose the bottom surface of the lens holder 2, and the winding portion 33m is wound around the 2 nd holding portion 72B of the lens holder 2. In the example shown in fig. 4A, the 2 nd extension portion 33B is wound three turns at the 2 nd holding portion 72B.

Next, with reference to fig. 5A and 5B, the details of the leaf spring 6 will be described. Fig. 5A is a plan view of the upper plate spring 16, and fig. 5B is a plan view of the lower plate spring 26.

In the illustrated example, the leaf spring 6 is made of a metal plate mainly made of a copper alloy. Specifically, the leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the cover member 4, and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. Each of the leaf springs 6 (the upper leaf spring 16, the 1 st lower leaf spring 26A, and the 2 nd lower leaf spring 26B) connects the lens holding member 2 with the fixed-side member FB, and supports the lens holding member 2 in the air so that the lens holding member 2 can move in the optical axis direction with respect to the fixed-side member FB. The 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B also function as power supply members for supplying current to the coil 3. Therefore, the 1 st lower leaf spring 26A is electrically connected to one end of the wire rod constituting the coil 3, and the 2 nd lower leaf spring 26B is electrically connected to the other end of the wire rod constituting the coil 3.

Specifically, as shown in fig. 5A, the upper leaf spring 16 has a substantially rectangular outer shape in plan view, and includes an annular inner portion 16i as an upper movable side support portion fixed to the lens holding member 2, two outer portions 16e as upper fixed side support portions fixed to the cover member 4 as a fixed side member FB, and 4 elastic arm portions 16g located between the inner portion 16i and each of the two outer portions 16 e. Specifically, the inner portion 16i is provided so as to face the pedestal portion 12D (see fig. 3A) of the lens holding member 2. The two outer side portions 16e have two corner portions 16b, respectively, and a stack portion 16r connecting the two corner portions 16 b. The stack portion 16r includes A1 st stack portion 16r1 extending along the 1 st side plate portion 4A1 and a 2 nd stack portion 16r2 extending along the 3 rd side plate portion 4 A3. The corner portion 16B is fixed to a step portion 4C formed at a corner of the cover member 4 (top plate portion 4B) by an adhesive AD1 (see fig. 7).

More specifically, when the upper leaf spring 16 is assembled to the lens driving device 100, as shown in fig. 3B, the inner portion 16i is placed on the pedestal portion 12D of the lens holding member 2 (see fig. 3A). The inner portion 16i is fixed to the lens holder 2 by an adhesive AD3 (see fig. 8) applied to each of the 4 concave portions 12H formed in the base portion 12D. The outer portion 16e is fixed to the top surface of the cover member 4 by an adhesive AD1 (see fig. 7) applied to the top surface of the step portion 4C formed at the corner of the cover member 4 (top plate portion 4B).

As shown in fig. 5A, the upper leaf spring 16 has a substantially rotationally symmetrical shape of 2 times with respect to the optical axis OA. The upper plate spring 16 is fixed to the lens holding member 2 in the inner portion 16i and fixed to the cover member 4 in the outer portion 16 e. Therefore, the upper plate spring 16 can support the lens holding member 2 in the air with good balance.

As shown in fig. 5B, the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are each configured to have a substantially semicircular inner shape. Each of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B includes an inner portion 26i as a lower movable side support portion fixed to the lens holding member 2, two outer portions 26e as lower fixed side support portions fixed to the base member 18 as a fixed side member FB, and an elastic arm portion 26g located between the inner portion 26i and the outer portions 26 e.

As shown in fig. 5B, the inner portions 26i of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B each include two inner joint portions 26c fixed to the lens holding member 2, a connecting portion 26p connecting the two inner joint portions 26c, and a connecting plate portion 26h facing the extending portion 33 of the coil 3 in the optical axis direction (Z axis direction).

When the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are assembled to the lens driving device 100, each of the 4 protruding setting portions 2T of the lens holding member 2 shown in fig. 3C is inserted and fitted into a circular through hole provided in the inner side engaging portion 26C of each of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B shown in fig. 5B. Thereby, the inner portions 26i of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are positioned and fixed to the lens holding member 2. The 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B are fixed to the lens holding member 2 by, for example, hot caulking or cold caulking at the protruding portion 2T of the lens holding member 2.

The following description with reference to fig. 4B mainly relates to the relationship between the 1 st lower plate spring 26A and the lens holding member 2 and the coil 3. Here, the description regarding the 1 st lower side plate spring 26A applies to the 2 nd lower side plate spring 26B as well.

As shown in fig. 3C and 4B, the connection plate portion 26h (see fig. 5B) of the inner portion 26i of the 1 st lower plate spring 26A faces the dam portion 82 of the lens holding member 2 when the lens driving device 100 is assembled. That is, the surface of the connecting plate portion 26h on the object side (Z1 side) is opposed to the storage portion 82s formed by the dam portion 82. As shown in fig. 4B, the opposing portion 33c of the 1 st extension portion 33A of the coil 3 extends between the object-side surface of the inner portion 26i (the connecting plate portion 26 h) of the 1 st lower plate spring 26A and the image pickup element-side (Z2-side) surface of the lens holding member 2.

As shown in fig. 4B, the dam portion 82 includes an inner wall portion 82u located on the center side of the lens holding member 2, an outer wall portion 82v located opposite to and outside the inner wall portion 82u, and a side wall portion 82w located between the inner wall portion 82u and the outer wall portion 82v on the side closer to the 1 st holding portion 72A. As shown in fig. 4B, an opening 82z having a wall opening is formed on the distal end side of the bank 82 distant from the 1 st holding portion 72A. The opposing portion 33c of the 1 st extending portion 33A passes through the opening 82z and extends outward. The space surrounded by the three wall portions (the inner wall portion 82u, the outer wall portion 82v, and the side wall portion 82 w) forms a housing portion 82s. The housing 82s is configured to be able to house a conductive adhesive that connects the 1 st extension 33A of the coil 3 and the 1 st lower plate spring 26A.

As shown in fig. 3C, when the 1 st lower plate spring 26A is assembled to the lens holding member 2, the 1 st holding portion 72A protrudes downward (in the Z2 direction) from the inner portion 26i of the 1 st lower plate spring 26A so that the tip thereof is positioned on the imaging element side (Z2 side) of the inner portion 26 i. Further, a part of the winding portion 33m is wound around the first holding portion 72A so as to be located on the imaging element side (Z2 side) of the inner portion 26 i.

The 1 st lower plate spring 26A and the 1 st extension 33A of the coil 3 are electrically and physically connected to each other by a conductive adhesive in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before the 1 st lower plate spring 26A is attached to the lens holder 2, the receiving portion 82s of the lens holder 2 surrounded by the dam 82 is coated with a conductive adhesive, and then the 1 st lower plate spring 26A is attached to the lens holder 2. The protruding portion 2T of the lens holding member 2 is heat staked, and the conductive adhesive is heat cured. The heat curing from the application of the conductive adhesive to the housing 82s is performed in a state where the lens holding member 2 is disposed upside down so that the 1 st holding portion 72A protrudes vertically upward. Therefore, even when the conductive adhesive has fluidity, the conductive adhesive can be appropriately left at a desired position (a position within the housing 82 s). Further, since a part of the opposing portion 33c is disposed in the housing portion 82s, it is buried in the conductive adhesive. The conductive adhesive is not limited to the thermosetting type, and may be an ultraviolet curing type, a moisture curing type, or the like.

As shown in fig. 5B, the outer portion 26e of the 1 st lower side plate spring 26A includes two outer engaging portions 26d fixed to the base member 18. The through hole provided in the outer engaging portion 26d of the 1 st lower leaf spring 26A is fitted into a protruding portion 18T (see fig. 6) provided on the upper surface of the base member 18. Thereby, the outer portion 26e of the 1 st lower side plate spring 26A is positioned and fixed to the base member 18.

As shown in fig. 5B, the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B have a shape that is substantially rotationally symmetrical about the optical axis OA 2 times. The 1 st lower leaf spring 26A is connected to the lens holder 2 by two inner engaging portions 26c and to the base member 18 by two outer engaging portions 26d. The same applies to the 2 nd lower plate spring 26B. According to this configuration, the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B can support the lens holding member 2 in the air with good balance in a state where they can move in the optical axis direction.

Next, the details of the base member 18 will be described with reference to fig. 6. Fig. 6 is a perspective view of a member constituting a part of the fixed-side member FB. Specifically, the upper view of fig. 6 is a perspective view of the base member 18 without the metal member 7 embedded therein, the central view of fig. 6 is a perspective view of the metal member 7 to be embedded in the base member 18, and the lower view of fig. 6 is a perspective view of the base member 18 after the metal member 7 is embedded therein. In the illustrated example, the fixed-side member FB includes the cover member 4, the magnet 5, the metal member 7, and the base member 18. In fig. 6, a dot pattern is marked on the metal member 7 for clarity.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the example of the drawing, as shown in fig. 6, the base member 18 has a substantially rectangular outer shape in a plan view, and has a circular opening 18K in the center.

Further, six protruding portions 18T protruding upward are provided on a surface (upper surface) of the base member 18 on the object side (Z1 side). The protruding portion 18T is inserted into and fitted into a through hole provided in the outer engaging portion 26d of each of the 1 st lower leaf spring 26A and the 2 nd lower leaf spring 26B. At this time, the protruding setting portion 18T is heat staked and fixed to the outer joint part 26d. In fig. 6, the protruding portion 18T is illustrated in a state in which the tip after heat staking is deformed. In addition, the protruding setting portion 18T may be fixed to the outer joint part 26d by cold staking.

Further, two concave portions 18G recessed downward are provided on the upper surface of the base member 18. In the illustrated example, the recess 18G includes a left recess 18GL provided so as to face the lower surface of the 1 st magnet 5A (1 st lower magnet 5 AL), and a right recess 18GR provided so as to face the lower surface of the 2 nd magnet 5B (2 nd lower magnet 5 BL).

Further, 4 wall portions 18W protruding upward are provided on the upper surface of the base member 18. In the example shown in the drawing, the wall portion 18W is configured to prevent an adhesive AD4 (see fig. 8) for adhering and fixing the cover member 4 and the base member 18 from entering the opening 18K through the upper surface of the base member 18. Specifically, the wall portion 18W includes a rear side wall portion 18WB, a front side wall portion 18WF, a left side wall portion 18WL, and a right side wall portion 18WR. The front side wall portion 18WF is configured to face the inner surface of the 1 st side plate portion 4A1 and extend in the Y-axis direction. The rear side wall portion 18WB is configured to face the inner surface of the 3 rd side plate portion 4A3 and extend in the Y-axis direction. The left side wall 18WL is configured to face the inner surface of the 2 nd side plate 4A2 and extend along the inner bottom surface of the left side recess 18GL in the X-axis direction. The right side wall portion 18WR is configured to face the inner surface of the 4 th side plate portion 4A4 and extend in the X-axis direction along the inner bottom surface of the right side recess 18 GR.

Further, 4 protrusions 18S protruding upward are provided at the corners of the base member 18. In the illustrated example, the 4 convex portions 18S are configured such that the upper surfaces of the respective convex portions are located on the same plane. The 4 protruding portions 18S are configured to be placed on the upper surfaces of the respective protruding portions and fix the outer engaging portions 26d of the lower leaf springs 26. The protruding portion 18T is configured to protrude upward from the upper surface of the protruding portion 18S.

As shown in fig. 6, the metal member 7 formed of a metal plate including copper, iron, or an alloy containing these as a main component is embedded in the base member 18 by insert molding.

The metal members 7 include 1 st to 6 th metal members 7A to 7F. The 1 st metal member 7A has a connection portion 7AC exposed on the upper surface (surface on the Z1 side) of the convex portion 18S formed on the base member 18, and the 2 nd metal member 7B has a connection portion 7BC exposed on the upper surface (surface on the Z1 side) of the other convex portion 18S formed on the base member 18. In addition, the surfaces of the connection portions 7AC and 7BC are on the same plane as the upper surfaces of the 4 projections 18S.

The connection portion 7AC is joined to the outer joining portion 26d of the 1 st lower leaf spring 26A via a conductive joining material in a state of being in contact with a portion including the through hole 26dt (see fig. 5B) in the outer joining portion 26d of the 1 st lower leaf spring 26A. The conductive bonding material is, for example, solder, conductive adhesive, or the like. In the illustrated example, the conductive bonding material is a conductive adhesive.

Similarly, the connection portion 7BC is joined to the outer joining portion 26d of the 2 nd lower leaf spring 26B via a conductive joining material in a state of being in contact with a portion including the through hole 26dt (see fig. 5B) in the outer joining portion 26d of the 2 nd lower leaf spring 26B.

The 1 st 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 2 nd 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 3 rd metal member 7C has a terminal portion 7CT protruding downward from the bottom surface (Z2-side surface) of the base member 18 and an end portion 7CP protruding outward from the corner of the base member 18 in a direction perpendicular to the optical axis direction. The 4 th metal member 7D has an end portion 7DP protruding outward in a direction perpendicular to the optical axis direction from a corner of the base member 18. The 5 th metal member 7E has an end portion 7EP protruding outward in a direction perpendicular to the optical axis direction from a corner of the base member 18. The 6 th metal member 7F has an end portion 7FP protruding outward in a direction perpendicular to the optical axis direction from a corner of the base member 18.

The base member 18 is fixed to the cover member 4 by welding the lower end portions of the four corners of the cover member 4 to each of the end portions 7CP to 7FP after the inner surface of the outer peripheral wall portion 4A of the cover member 4 and the outer peripheral side portion 18E of the base member 18 are combined and positioned. The cover member 4 and the base member 18 are fixed by an adhesive AD4 (see fig. 8). The cover member 4 is connected to ground via a terminal portion 7CT of the 3 rd metal member 7C.

Next, an upper assembly UA of the lens driving device 100 will be described with reference to fig. 7. The upper assembly UA mainly includes the cover member 4, the upper leaf spring 16, and the magnet 5. Fig. 7 is a diagram illustrating an assembly procedure of the upper assembly UA. Specifically, the top view of fig. 7 shows a perspective view of the cover member 4 in an upside-down state, and fig. 7, the upper 2 nd view, shows a perspective view of the cover member 4 after the upper leaf spring 16 is fitted. Fig. 7, fig. 3, which is a top view, further shows a perspective view of the cover member 4 in which the 1 st upper magnet 5AU (not visible in fig. 7) and the 2 nd upper magnet 5BU are embedded, and fig. 7, which is a bottom view, further shows a perspective view of the cover member 4 in which the 1 st lower magnet 5AL and the 2 nd lower magnet 5BL are embedded. That is, the lowermost drawing of fig. 7 shows a state in which the upper assembly UA is completed. In fig. 7, for clarity, a dot pattern is given to a member immediately after being fitted into the cover member 4.

Typically, as shown in fig. 7, the upper assembly UA of the lens driving apparatus 100 is assembled in a state in which the cover member 4 is placed upside down, that is, in a state in which the inner side (Z2 side) surface (top surface) of the top plate 4B is directed upward. In this state, the adhesive AD1 is applied to the top surface (Z2-side surface) of the step portion 4C formed at each of the 4 corners of the cover member 4 (top plate portion 4B). The step 4C is configured to abut against the corner portion 16b of the outer portion 16e, which is the upper fixed side support portion of the upper leaf spring 16.

After that, the upper leaf spring 16 is fitted into the inside of the cover member 4 in an inverted state as shown in fig. 2 of the upper number of fig. 7. 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 corner portion 16B is in contact with the top surface (surface on the Z2 side) of the step portion 4C of the cover member 4, and such that the upper surface (surface on the Z1 side) of the stack portion 16r is not in contact with the top surface (surface on the Z2 side) of the top plate portion 4B of the cover member 4. In the illustrated example, the outer portion 16e (corner portion 16 b) of the upper-side plate spring 16 is adhesively fixed to the top surface of the step portion 4C of the cover member 4 by an adhesive AD 1.

Thereafter, the adhesive AD2 is applied to the inner surfaces of the 2 nd side plate portion 4A2 and the 4 th side plate portion 4A4 of the cover member 4. Specifically, as shown in fig. 2, which is the top number of fig. 7, an adhesive AD2 for adhering and fixing the outer surface of the 2 nd magnet 5B to the inner surface of the 4 th side plate portion 4A4 is applied to the inner surface of the 4 th side plate portion 4 A4. Although not visible in fig. 7, an adhesive AD2 for adhering and fixing the outer surface of the 1 st magnet 5A to the inner surface of the 2 nd side plate portion 4A2 is also applied to the inner surface of the 2 nd side plate portion 4 A2.

In the illustrated example, the adhesive AD1 and the adhesive AD2 are applied at different timings, but may be applied at the same time. The adhesives AD1 and AD2 are mixed adhesives that are cured by ultraviolet light or heat. Ultraviolet-based curing is effective for achieving rapid bonding (temporary fixation), and thermal-based curing is effective for achieving higher bonding strength than ultraviolet-based curing. However, the adhesive AD1 and the adhesive AD2 may be other adhesives such as a moisture-curable adhesive, an ultraviolet-curable adhesive, and a thermosetting adhesive.

Then, as shown in fig. 3, which is the top of fig. 7, the 2 nd upper magnet 5BU of the 2 nd magnet 5B is fitted into the cover member 4. Specifically, the 2 nd upper magnet 5BU is fitted into the cover member 4 so that its outer surface contacts the inner surface of the 4 th side plate portion 4 A4. In the illustrated example, the 2 nd upper magnet 5BU is fitted into the cover member 4 so as not to contact the corner portion 16b of the upper plate spring 16. The same applies to the 1 st upper magnet 5AU which cannot be seen in fig. 7. In the illustrated example, the stack portion 16r of the upper leaf spring 16 is formed along each of the 1 st side plate portion 4A1 and the 3 rd side plate portion 4A3, but is not formed along each of the 2 nd side plate portion 4A2 and the 4 th side plate portion 4 A4. This is to avoid interference with the magnet 5 embedded in the cover member 4.

Then, as shown in the lowermost drawing of fig. 7, the 2 nd lower magnet 5BL of the 2 nd magnet 5B is fitted into the cover member 4 in the same manner as the 2 nd upper magnet 5 BU. Specifically, the 2 nd lower magnet 5BL is fitted into the cover member 4 below the 2 nd upper magnet 5BU (on the Z2 side) so that its outer surface contacts the inner surface of the 4 th side plate portion 4 A4. The same applies to the 1 st lower magnet 5 AL.

Next, a lower assembly LA of the lens driving apparatus 100 will be described with reference to fig. 8. The lower assembly LA is mainly composed of the lens holding member 2, the coil 3, the metal member 7, the lower leaf spring 26, and the base member 18.

As shown in fig. 8, the upper assembly UA is assembled to the lower assembly LA. Fig. 8 is a diagram illustrating an assembly procedure of the lens driving device 100. Specifically, the uppermost drawing of fig. 8 shows a perspective view of the lower assembly LA. Fig. 8, fig. 2, is a perspective view of the lower assembly LA in which the adhesive AD3 is applied to the 4 concave portions 12H formed in the seat portion 12D of the cylindrical portion 12 of the lens holder 2, and the vibration damping member VC is mounted between the lens holder 2 and the base member 18. Fig. 8, fig. 3, is a perspective view of the lower assembly LA after the upper assembly UA is mounted, and fig. 8, which is a bottom view, is a perspective view of the lens driving device 100 in a state in which the lower ends of the four corners of the cover member 4 are welded to the metal member 7 by the welding metal WM, and the adhesive AD4 is applied between the cover member 4 and the base member 18. In fig. 8, for clarity, the adhesive AD3, the adhesive AD4, the vibration damping member VC, and the weld metal WM are marked with cross-line patterns.

Typically, as shown in fig. 8, the upper assembly UA and the lower assembly LA are joined in a state in which the upper surface of the lower assembly LA is directed upward, that is, in a state in which the upper surface of the pedestal portion 12D in the cylindrical portion 12 of the lens holding member 2 is directed upward. In this state, as shown in fig. 2 from top to bottom of fig. 8, an adhesive AD3 is applied to 4 concave portions 12H formed in the pedestal portion 12D, and a vibration damping member VC is attached between the front side surface of the lens holder 2 and the front side wall portion 18WF of the base member 18 and between the rear side surface of the lens holder 2 and the rear side wall portion 18WB of the base member 18. The vibration damping member VC is a member for suppressing vibration of the lens holding member 2. In the illustrated example, the vibration damping member VC is a gel-like member formed by curing an adhesive.

Thereafter, as shown in fig. 3 of the top of fig. 8, the lower assembly LA is fitted into the upper assembly UA. Specifically, the lower assembly LA is fitted into the upper assembly UA so that the inner portions 16i of the upper side plate springs 16 contact the pedestal 12D of the lens holding member 2, and so that the lower ends of the four corners of the cover member 4 contact each of the 3 rd to 6 th metal members 7C to 7F.

The front side wall portion 18WF of the base member 18 is configured in this state to expose the outer surface from each of the 4 1 st cutout portions CU1 formed in the lower portion of the 1 st side plate portion 4 A1. The same is true for the rear side wall portion 18WB of the base member 18, although it cannot be seen in fig. 8. In this state, the 1 st lower magnet 5AL is configured to expose the outer surface from each of the 4 nd cutout portions CU2 formed in the lower portion of the 2 nd side plate portion 4 A2. The same applies to the 2 nd lower magnet 5BL, although it cannot be seen in fig. 8.

Thereafter, as shown in the lowermost drawing of fig. 8, the lower end of the lid member 4 and each of the 3 rd to 6 th metal members 7C to 7F are welded by the welding metal WM. The cover member 4, the magnet 5, and the base member 18 are bonded and fixed by an adhesive AD 4.

Specifically, as shown in the lowermost drawing of fig. 8, the 1 st side plate portion 4A1 of the cover member 4 and the front side wall portion 18WF of the base member 18 are bonded and fixed by the adhesive AD4 applied to the 1 st cutout portion CU 1. As shown in the lowermost drawing of fig. 8, the 2 nd side plate portion 4A2 and the 1 st lower magnet 5AL of the cover member 4 and the left concave portion 18GL of the base member 18 are bonded and fixed by the adhesive AD4 applied to the 2 nd cutout portion CU 2.

In the illustrated example, the adhesives AD3 and AD4 are thermosetting adhesives, and are different from the adhesives AD1 and AD2 which are a mixture of an ultraviolet curable adhesive and a thermosetting adhesive. The thermosetting adhesive can be used to achieve a higher adhesive strength than the hybrid adhesive. However, the adhesive AD3 and the adhesive AD4 may be other adhesives such as a moisture-curable adhesive, an ultraviolet-curable adhesive, or a hybrid adhesive.

Next, the positional relationship among the coil 3, the magnet 5, and the leaf spring 6 housed in the housing HS will be described with reference to fig. 9A to 9C. Fig. 9A is a perspective view of the lens driving device 100 in a state where the lower cover member 4 is detached, fig. 9B is a front view of the lens driving device 100, and fig. 9C is a left side view of the lens driving device 100. Fig. 9A to 9C show the lens driving apparatus 100 in an initial state. The initial state of the lens driving device 100 refers to a state of the lens driving device 100 when no current flows through the coil 3. In fig. 9B and 9C, the cover member 4 is shown in cross section because the inside of the housing HS is illustrated. In fig. 9C, the 1 st winding portion 13A of the coil 3 hidden in the shadow of the 1 st magnet 5A and not visible is indicated by a one-dot chain line.

As shown in fig. 9A to 9C, the magnet 5 is adhesively fixed to the inner surface of the outer peripheral wall 4A such that the upper end thereof protrudes upward from the upper leaf spring 16 and the lower end thereof protrudes downward from the lower leaf spring 26. As shown in fig. 9B, the magnet 5 is adhesively fixed to the inner surface of the outer peripheral wall 4A so that the upper surface thereof contacts the top surface of the top plate 4B of the cover member 4. Further, as shown in fig. 9C, the corner portion 16b of the upper plate spring 16 is adhesively fixed to the top surface of the stepped portion 4C of the cover member 4.

Specifically, as shown in fig. 9B and 9C, the width H1, which is the distance between the upper end and the lower end of the magnet 5 in the Z-axis direction, is larger than the width H2, which is the distance between the upper leaf spring 16 and the lower leaf spring 26 in the Z-axis direction. The width H2 is larger than the distance between the upper end and the lower end of the winding portion 13 of the coil 3 in the Z-axis direction, that is, the width H3.

The respective magnitudes of the width H1, the width H2, and the width H3 are set as follows: even when the lens holder 2 is moved upward along the optical axis OA by the driving unit DM, the upper end of the coil 3 (winding unit 13) is positioned below the upper end of the magnet 5. The respective magnitudes of the width H1, the width H2, and the width H3 are set as follows: even when the lens holder 2 is moved downward along the optical axis OA by the driving unit DM, the lower end of the coil 3 (winding unit 13) is positioned above the lower end of the magnet 5. That is, the respective magnitudes of the width H1, the width H2, and the width H3 are set so that the coil 3 (winding portion 13) moves up and down within the width H1, that is, the coil 3 (winding portion 13) does not move up and down beyond the range of the width H1. In other words, the maximum value of the current flowing in the coil 3 is limited to a range in which the coil 3 (the winding portion 13) does not move up and down beyond the width H1.

As shown in fig. 9C, the width W1, which is the distance between one end and the other end of the 1 st magnet 5A in the X-axis direction, is substantially the same as the width W2, which is the distance between one end and the other end of the 1 st winding portion 13A of the coil 3 in the X-axis direction. However, the width W1 may be larger than the width W2.

In this way, the width W1 and the width W2 are each set to be such that the magnetic field generated by the magnet 5 can vertically traverse the entire region of the linear portion (portion extending in a straight line along the X-axis direction) of the coil 3 (winding portion 13).

As shown in fig. 9C, the width W1 is smaller than the width W3, which is the distance between one end and the other end of the concave portion 18G of the base member 18 in the X-axis direction. The width W1 and the width W3 are set so that the magnet 5 does not contact the base member 18 and the lower end of the magnet 5 enters the recess 18G. That is, the respective magnitudes of the width W1 and the width W3 are set as: it is possible to avoid interference between the magnet 5 and the base member 18 when the upper assembly UA is assembled to the lower assembly LA.

Next, the adhesive fixation of the cover member 4, the magnet 5, and the base member 18 will be described with reference to fig. 10. Fig. 10 is a cross-sectional view of the cover member 4, the magnet 5, and the base member 18, and shows a cross-section in the cut surface CS shown in fig. 8.

As shown in fig. 10, a gap GP is formed between the lower surface LF of the magnet 5 (1 st lower magnet 5 AL) and the inner bottom surface BF of the recess 18G in the base member 18. This is because the magnet 5 is fixed to the inner surface of the 2 nd side plate portion 4A2 of the cover member 4 by adhesion with the adhesive AD2 on the outer surface thereof in a state where the upper surface thereof is in contact with the top surface of the top plate portion 4B of the cover member 4. Therefore, the adhesive AD4 applied to the 2 nd cutout portion CU2 enters the gap GP, and is cured in a state of being adhered to the magnet 5, the cover member 4, and the base member 18.

This structure can improve the adhesive strength of the magnet 5 with respect to the fixing-side member FB, compared with the case where the magnet 5 is only adhered and fixed to the cover member 4. Therefore, this configuration brings about the following effects: it is possible to more reliably prevent the magnet 5 from peeling off from the cover member 4 when a strong force such as an impact is applied to the lens driving device 100.

As described above, as shown in fig. 2, the lens driving apparatus 100 according to the present embodiment includes: the lens holder includes a housing HS including a base member 18 and a cover member 4 made of a nonmagnetic material, a lens holding member 2 disposed in the housing HS and capable of holding a lens, a coil 3 fixed to the lens holding member 2, a magnet 5 facing the coil 3 and fixed to an inner surface of the cover member 4, and an upper leaf spring 16 and a lower leaf spring 26 for supporting the lens holding member 2 so as to be movable in an optical axis direction. As shown in fig. 5A, the upper leaf spring 16 includes an inner portion 16i as an upper movable side support portion fixed to the upper portion of the lens holding member 2, an outer portion 16e as an upper fixed side support portion fixed to the cover member 4, and an elastic arm portion 16g provided between the inner portion 16i and the outer portion 16 e. As shown in fig. 5B, the lower leaf spring 26 has an inner portion 26i as a lower movable side support fixed to the lower portion of the lens holding member 2, an outer portion 26e as a lower fixed side support fixed to the base member 18, and an elastic arm portion 26g provided between the inner portion 26i and the outer portion 26 e. As shown in fig. 9B, the magnet 5 is attached to the cover member 4 such that the upper surface is located above the upper plate spring 16 and the lower surface is located below the lower plate spring 26.

In this configuration, the magnet 5 is sized to face the entire side surface of the coil 3 (winding portion 13) fixed to the lens holding member 2 even when the lens holding member 2 moves up and down in the optical axis direction, and is attached to the cover member 4. Therefore, this configuration can generate a sufficient driving force (thrust force) by the driving portion DM even when the cover member 4 is formed of a non-magnetic material.

That is, in this configuration, the magnet 5 is formed so that the length (height) in the optical axis direction becomes larger than that of the magnet in the configuration including the cover member formed of the magnetic material. Therefore, this configuration can suppress a decrease in driving force (thrust force) when the cover member made of the magnetic material is replaced with the cover member 4 made of the nonmagnetic material by increasing the length (height) of the magnet 5.

As shown in the upper view of fig. 6, in the lens driving apparatus 100, a concave portion 18G recessed below the upper surface of the convex portion 18S as a fixing portion may be formed in the base member 18. The lower end of the magnet 5 may be disposed in the recess 18G. Further, the convex portion 18S is configured to support an outer portion 26e of the lower leaf spring 26 as a lower fixing side support portion.

In this configuration, the recess 18G can be placed in the lower end portion of the magnet 5. Therefore, this configuration brings about the following effects: in the configuration in which the magnet 5 is disposed above the base member 18, the length (height) of the lens driving device 100 in the optical axis direction can be prevented from increasing by an amount that the length (height) of the magnet 5 in the optical axis direction increases. Alternatively, this configuration has an effect of enabling the height of the lens driving device 100 to be reduced.

In the lens driving apparatus 100, a gap GP may be formed between the lower surface LF of the magnet 5 and the inner bottom surface BF of the recess 18G as shown in fig. 10, and a part of the adhesive AD4 adhering to the magnet 5, the cover member 4, and the base member 18 may enter the gap GP.

This configuration has an effect of improving the adhesive strength between the magnet 5 and the fixing-side member FB, as compared with the case where the adhesive AD4 is attached to the cover member 4 and the base member 18 but is not attached to the magnet 5.

In the lens driving apparatus 100, the cover member 4 may include an outer peripheral wall portion 4A and a top plate portion 4B. In this case, the lower portion of the outer peripheral wall portion 4A covers the outer peripheral side portion 18E of the base member 18. The magnet 5 is fixed to the inner surface of the outer peripheral wall 4A so that the lower portion of the magnet 5 is exposed from the cutout portion CU formed in the lower portion of the outer peripheral wall 4A. The adhesive AD4 provided so as to cover the cutout CU opened downward is attached to the magnet 5, the cover member 4, and the base member 18. In the example shown in fig. 8, the 1 st lower magnet 5AL is fixed to the inner surface of the 2 nd side plate portion 4A2 so as to expose the lower portion from the 2 nd cutout portion CU2 formed in the lower portion of the 2 nd side plate portion 4A2 of the outer peripheral wall portion 4A. The adhesive AD4 provided so as to cover the 2 nd cutout portion CU2 is attached to the 1 st lower magnet 5AL, the cover member 4 (2 nd side plate portion 4 A2), and the base member 18.

In the lens driving apparatus 100, as shown in fig. 2, the outer peripheral wall portion 4A may be configured to: the side plate portion 4A1, the 2 nd side plate portion 4A2, the 3 rd side plate portion 4A3, and the 4 th side plate portion 4A4 are included, the 1 st side plate portion 4A1 and the 3 rd side plate portion 4A3 are opposed to each other, and the 2 nd side plate portion 4A2 and the 4 th side plate portion 4A4 are opposed to each other. In this case, the magnet 5 may include a1 st magnet 5A fixed to the inner surface of the 2 nd side plate portion 4A2, and A2 nd magnet 5B fixed to the inner surface of the 4 th side plate portion 4 A4. Further, the upper plate spring 16 or the lower plate spring 26 may include a stack portion extending along each of the 1 st side plate portion 4A1 and the 3 rd side plate portion 4 A3. In the example shown in fig. 2, the upper plate spring 16 includes a stack portion 16r extending along each of the 1 st plate portion 4A1 and the 3 rd plate portion 4 A3.

In the lens driving apparatus 100, as shown in fig. 1, the top plate portion 4B may have 4 stepped portions 4C formed at 4 corner portions, respectively. In this case, the upper surface of the magnet 5 is in contact with the top surface of the top plate 4B between the two stepped portions 4C. In the illustrated example, the upper surface of the 1 st upper magnet 5AU is in contact with the top surface of the top plate 4B between the 2 nd step 4C2 and the 3 rd step 4C 3. The upper surface of the 2 nd upper magnet 5BU is in contact with the top surface of the top plate 4B between the 1 st step 4C1 and the 4 th step 4C 4.

In this configuration, the upper plate spring 16 can have its upper surface in contact with the top surface of the step portion 4C located below the upper surface of the magnet 5. Therefore, this configuration can ensure that the upper end portion of the lens holding member 2 can enter the space between the upper plate spring 16 and the top plate portion 4B of the cover member 4, and thus no other member such as a spacer for ensuring such space is required. Therefore, this configuration has an effect that the number of components can be reduced as compared with a configuration including a spacer.

In the lens driving apparatus 100, as shown in fig. 3B and 3C, the coil 3 may have a coil axis CX perpendicular to the up-down direction (optical axis direction). The magnet 5 may include an upper magnet and a lower magnet that overlap in the up-down direction (optical axis direction). The coil 3 is fixed to the lens holding member 2 so as to move up and down within a width between an upper end of the upper magnet and a lower end of the lower magnet.

In the illustrated example, the magnet 5 includes a 1 st magnet 5A and a 2 nd magnet 5B. The 1 st magnet 5A includes a 1 st upper magnet 5AU and a 1 st lower magnet 5AL, and the 2 nd magnet 5B includes a 2 nd upper magnet 5BU and a 2 nd lower magnet 5BL. The coil 3 includes a 1 st winding portion 13A and a 2 nd winding portion 13B. As shown in fig. 9B, the 1 st winding portion 13A is fixed to the 1 st projection 12PA of the lens holding member 2 so as to move up and down within the width H1 between the upper end of the 1 st upper magnet 5AU and the lower end of the 1 st lower magnet 5 AL. As shown in fig. 9B, the 2 nd winding portion 13B is fixed to the 2 nd protrusion 12PB of the lens holding member 2 so as to move up and down within the width H1 between the upper end of the 2 nd upper magnet 5BU and the lower end of the 2 nd lower magnet 5BL.

In this configuration, the 1 st magnet 5A is sized so as to be able to face the entire side surface of the 1 st winding portion 13A fixed to the lens holding member 2 even when the lens holding member 2 moves up and down in the optical axis direction. The 2 nd magnet 5B is sized so as to be able to face the entire side surface of the 2 nd winding portion 13B fixed to the lens holding member 2 even when the lens holding member 2 moves up and down in the optical axis direction. Therefore, this configuration can generate a sufficient driving force (thrust force) by the driving portion DM even when the cover member 4 is formed of a non-magnetic material.

In the lens driving apparatus 100, an adhesive AD2 (see fig. 7) different from the adhesive AD4 (see fig. 8) attached to the lower portion of the magnet 5, the cover member 4, and the base member 18 may be applied between the outer surface of the magnet 5 and the inner surface of the cover member 4. For example, the adhesive AD2 may be a uv-curable and heat-curable mixed adhesive, and the adhesive AD4 may be a heat-curable adhesive. In this case, the magnet 5 is temporarily fixed to the lid member 4 by the ultraviolet-curable adhesive AD2 when the upper assembly UA is assembled, and then, is completely fixed to the lid member 4 by the thermosetting adhesive AD2 and the adhesive AD4 after the upper assembly UA is assembled to the lower assembly LA. Further, curing of the heat-based adhesive AD4 may be accomplished simultaneously with curing of the heat-based adhesive AD 2.

In this configuration, after the magnet 5 is temporarily fixed to the cover member 4 by the ultraviolet-curable adhesive AD2, the magnet is completely fixed to the cover member 4 by the same adhesive AD2 and adhesive AD4 that are also thermally cured. This configuration therefore has the effect of improving the assembling property of the magnet 5 to the cover member 4 and improving the adhesive strength between the cover member 4 and the magnet 5.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiment. The above-described embodiments can be applied to various modifications, substitutions, and the like without departing from the scope of the present invention. Further, the features described with reference to the above embodiments may be appropriately combined as long as no technical contradiction occurs.

For example, in the above embodiment, the 1 st magnet 5A is constituted by a combination of the 1 st upper magnet 5AU and the 1 st lower magnet 5AL magnetized in the direction perpendicular to the optical axis OA, but may be constituted by one diode magnet magnetized in the optical axis direction. In this case, the upper part of the diode magnet has a magnetic pole corresponding to the inner part of the 1 st upper magnet 5AU, and the lower part has a magnetic pole corresponding to the inner part of the 1 st lower magnet 5 AL. The same applies to the 2 nd magnet 5B.

In the above embodiment, the coil 3 is a coil having the coil axis CX perpendicular to the optical axis direction, but may be a coil having the coil axis OA wound around the outer periphery of the lens holding member 2.

In the above embodiment, the outer portion 16e of the upper plate spring 16 is fixed in contact with the top plate portion 4B of the cover member 4. However, a spacer may be provided between the top plate 4B and the outer portion 16 e. In this case, the outer portion 16e may be fixed to the cover member 4 via the spacer.

Claims (9)

1. A lens driving device is provided with:

a frame body including a base member and a cover member formed of a nonmagnetic material;

a lens holding member which is disposed in the housing and can hold the lens body;

a coil fixed to the lens holding member;

a magnet which is fixed to the inner surface of the cover member so as to face the coil; and

an upper leaf spring and a lower leaf spring which support the lens holding member so as to be movable in the optical axis direction,

the lens driving device is characterized in that,

the upper plate spring has an upper movable side supporting portion fixed to an upper portion of the lens holding member, an upper fixed side supporting portion fixed to the cover member, and an elastic arm portion provided between the upper movable side supporting portion and the upper fixed side supporting portion,

The lower plate spring has a lower movable side supporting portion fixed to a lower portion of the lens holding member, a lower fixed side supporting portion fixed to the base member, and an elastic arm portion provided between the lower movable side supporting portion and the lower fixed side supporting portion,

the upper surface of the magnet is located above the upper leaf spring, and the lower surface of the magnet is located below the lower leaf spring.

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

the base member is formed with a recess recessed below an upper surface of a fixing portion of the lower fixing side supporting portion for supporting the lower leaf spring,

the lower end of the magnet is disposed in the recess.

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

a gap is formed between the lower surface of the magnet and the inner bottom surface of the recess, and a part of the adhesive adhering to the magnet, the cover member, and the base member enters the gap.

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

the cover member includes an outer peripheral wall portion and a top plate portion,

the lower part of the outer peripheral wall part is covered by the outer peripheral side part of the base member,

The magnet is fixed on the inner surface of the outer peripheral wall part in a manner that the lower part of the magnet is exposed from a notch part formed on the lower part of the outer peripheral wall part,

an adhesive provided so as to cover the cutout portion opened downward is attached to the magnet, the cover member, and the base member.

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

the outer peripheral wall portion includes a 1 st side plate portion, a 2 nd side plate portion, a 3 rd side plate portion, and a 4 th side plate portion, the 1 st side plate portion and the 3 rd side plate portion are opposed to each other, and the 2 nd side plate portion and the 3 rd side plate portion are opposed to each other,

the magnet includes a 1 st magnet fixed to an inner surface of the 2 nd side plate portion and a 2 nd magnet fixed to an inner surface of the 4 th side plate portion,

the upper side plate spring or the lower side plate spring includes a stack portion extending along each of the 1 st side plate portions and the 3 rd side plate portions.

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

the top plate part has 4 steps formed at 4 corners respectively,

the upper surface of the magnet is connected with the top surface of the top plate part between the two step parts.

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

the coil has a coil axis perpendicular to the up-down direction,

the magnet includes an upper magnet and a lower magnet which are overlapped in the up-down direction,

the coil is fixed to the lens holding member so as to move up and down within a width between an upper end of the upper magnet and a lower end of the lower magnet.

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

an adhesive different from an adhesive attached to the lower portion of the magnet, the cover member, and the base member is applied between the outer surface of the magnet and the inner surface of the cover member.

9. A camera module, comprising:

the lens driving apparatus of any one of claims 1 to 8;

the lens body; and

and an imaging element facing the lens body.