CN111492285B

CN111492285B - Lens driving device, camera module, and method for manufacturing lens driving device

Info

Publication number: CN111492285B
Application number: CN201880081779.0A
Authority: CN
Inventors: 长田宽志
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2017-12-19
Filing date: 2018-11-14
Publication date: 2022-03-29
Anticipated expiration: 2038-11-14
Also published as: WO2019123902A1; JP6826212B2; CN111492285A; JPWO2019123902A1

Abstract

A lens drive device (101) is provided with a lens holding member (2), a housing (4), a leaf spring (6), a base member (18), and a drive Mechanism (MK). The base member (18) has a receiving surface (18R) for supporting the leaf spring (6) and a side wall surface (18W) facing the inner surface (4AS) of the outer wall portion (4A) of the housing (4). The side wall surface (18W) has a raised portion (18B) raised toward the inner surface (4AS) AS a guide portion. One end (18BU) of the bulge (18B) is arranged at a position closer to the receiving surface (18R) than the other end (18BD), and the other end (18BD) is arranged to be exposed from the outer wall (4A). The plate spring (6) is fixed to the base member (18) and the case (4) by an Adhesive (AD) that is applied to the other end (18BD) side and that spreads between the receiving surface (18R) and the plate spring (6) via the one end (18 BU).

Description

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

Technical Field

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

Background

Conventionally, there is known a drive mechanism for a camera module including: a holder (lens holding member) that holds the lens unit; a coil disposed on an outer periphery of the lens holding member; an upper plate spring and a lower plate spring which support the lens holding member so as to be movable in the optical axis direction; and a base member (see patent document 1).

In this drive mechanism, the lower leaf spring is bonded to the base member via an adhesive. Specifically, a positioning hole is formed in the lower leaf spring, and an adhesive region is formed in a position of the base member corresponding to the positioning hole. Further, the lower plate spring is bonded to the base member via an adhesive applied to the bonding region.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2014-62976

Disclosure of Invention

Problems to be solved by the invention

However, since the adhesive region is formed in a deep portion of the base member, it is difficult to appropriately apply the adhesive to a desired position. Therefore, the adhesive may be applied to an inappropriate position.

Therefore, it is desirable to provide a lens driving device capable of easily applying an adhesive for fixing a plate spring.

Means for solving the problems

The lens driving device according to an embodiment of the present invention includes: a base member; a housing having a cylindrical outer wall and fixed to the base member; a lens holding member capable of holding a lens body; a plate spring that supports the lens holding member disposed in the housing so as to be movable in the optical axis direction; and a drive mechanism that moves the lens holding member in the optical axis direction, wherein the base member includes: a receiving surface perpendicular to the optical axis direction and supporting the plate spring; and a side wall surface facing an inner surface of the outer wall portion in the housing, the side wall surface including a guide portion having one end portion and the other end portion located at different positions in the optical axis direction, the one end portion of the guide portion being disposed at a position located inside the outer wall portion and closer to the receiving surface than the other end portion, the other end portion being disposed so as to be exposed from the outer wall portion, the plate spring being configured to be fixed to the base member and the housing via an adhesive, the adhesive being applied to the other end portion side and spreading between the receiving surface and the plate spring via the one end portion.

Effects of the invention

According to the above aspect, a lens driving device in which an adhesive for fixing a plate spring is easily applied 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 rear 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 housing is omitted.

Fig. 4B is a left side view of the lens driving device in a state where the housing is 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.

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

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

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

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

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

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

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

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

Fig. 10A is a bottom view of the lens driving device with parts omitted.

Fig. 10B is a bottom view of the lens driving device with parts omitted.

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

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

Fig. 12A is a diagram illustrating an example of connection between a leaf spring and a coil in the lens driving device.

Fig. 12B is a diagram illustrating an example of connection between the leaf spring and the coil in the lens driving device.

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

Fig. 13B is an upper perspective view of the base member of the lens driving device.

Fig. 14A is a rear view of the base member and the lower leaf spring.

Fig. 14B is a top view of the base member.

Fig. 14C is a sectional view of the base member and the lower leaf spring.

Fig. 14D is a sectional view of the base member and the lower leaf spring.

Fig. 15A is a partial plan view of the base member and the lower leaf spring.

Fig. 15B is a partial plan view of the base member and the lower leaf spring.

Fig. 16A is an upper perspective view of the base member and the lower leaf spring.

Fig. 16B is a sectional view of the housing, the base member, and the lower leaf spring.

Fig. 17A is an upper perspective view of the base member and the lower leaf spring.

Fig. 17B is a sectional view of the housing, the base member, and the lower leaf spring.

Fig. 18A is an upper perspective view of the base member and the lower leaf spring.

Fig. 18B is a sectional view of the housing, the base member, and the lower leaf spring.

Detailed Description

Hereinafter, a lens driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of a lens driving device 101. Fig. 2A is an upper perspective view of the lens driving device 101, and fig. 2B is a rear view of the lens driving device 101 as viewed from the Y1 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 housing 4 omitted, and corresponds to fig. 2A. Fig. 4B is a left side view of the lens driving device 101 in a state where the housing 4 is omitted, as viewed from the X2 side.

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 along an optical axis direction JD (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 JD; and a fixed-side member RG to which the plate spring 6 is fixed. The lens body is, for example, a cylindrical lens barrel including at least 1 lens, and is configured such that a central axis thereof is along the optical axis direction JD. The optical axis direction JD includes a direction of an optical axis of the lens body and a direction parallel to the optical axis.

As shown in fig. 1, drive mechanism MK includes: a coil 3 wound in an octagonal ring shape; and 2 magnets 5 arranged to face the coil 3. Stationary-side member RG includes case 4 and base member 18 in which metal member 7 is embedded. As shown in fig. 3B, the metal member 7 includes

terminals

7A, 7B, and 7C for electrically connecting to the outside. The plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the housing 4; and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B. The housing 4 has: a rectangular annular outer wall portion 4A; and a flat upper surface portion 4B provided continuously to an upper end (end on the Z1 side) of the outer wall portion 4A. The outer wall portion 4A has: a pair of 1 st side plate portions 4a1 facing each other; and a pair of 2 nd side panel portions 4a2 perpendicular to the 1 st side panel portion 4a1 and opposed to each other.

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 mounted on the lens holding member 2, and the imaging element mounted on the substrate so as to face the lens body constitute a camera module. The coil 3 is connected to a power supply via the

lower leaf springs

26A and 26B, the

terminals

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

The lens driving device 101 moves the lens holding member 2 in the optical axis direction JD on the Z1 side (object side) of the imaging element by the electromagnetic force. The lens driving device 101 can move the lens holding member 2 in a direction away from the image pickup device to perform macro image pickup and can move the lens holding member 2 in a direction close to the image pickup device to perform infinity image pickup.

Next, the lens holding member 2 and the drive mechanism MK will be described. Fig. 5A is an upper perspective view of the lens holding member 2, and fig. 5B is an upper perspective view illustrating a state in which the coil 3 is wound around the lens holding member 2 of fig. 5A. Fig. 6A is a lower perspective view of the lens holding member 2, and fig. 6B is a lower perspective view showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 6A. Fig. 7A is a plan view of the lens holding member 2, and fig. 7B is a right side view of the lens holding member 2 as viewed from the X1 side. Fig. 8A is a lower perspective view of the lens holding member 2, and fig. 8B is a lower perspective view showing a state in which the coil 3 is wound around the lens holding member 2 shown in fig. 8A. Fig. 9A is an enlarged view of a portion S shown in fig. 8B, and fig. 9B is an enlarged view of a portion P shown in fig. 6B. Fig. 10A is a bottom view of the lens driving device 101 in a state where the metal member 7 and the base member 18 are omitted, and fig. 10B is a bottom view of the lens driving device 101 in a state where the lower plate spring 26 and the lens holding member 2 are further omitted.

In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, as shown in fig. 5A, the lens holding member 2 includes: a cylindrical portion 12 formed to penetrate along the optical axis direction JD; and a flange portion (flange-like portion) 52 formed on the imaging element side (Z2 side) in the optical axis direction JD. In the present embodiment, the cylindrical portion 12 is formed in a cylindrical shape on the object side (Z1 side) in the optical axis direction JD.

The cylindrical portion 12 may be provided with a screw groove on an inner peripheral surface thereof so as to mount a lens body. In the present embodiment, the lens body is fixed to the cylindrical portion 12 with an adhesive. Therefore, the cylindrical portion 12 is not formed with a thread groove. Further, in the cylindrical portion 12, a pedestal portion 12d having a recess 12dh (see fig. 5A) is provided at 4 across the optical axis on the end surface on the object 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 coil support portion 12j as an outer wall portion that supports the coil 3 from the inside is provided on the outer peripheral surface of the cylindrical portion 12. In the present embodiment, the coil support portion 12j has an octagonal outer shape when viewed from above so as to be able to support the octagonal ring-shaped coil 3. On the object side of the coil support portion 12j, at 4, a flange portion 12h (see fig. 7A and 7B) is formed that protrudes radially outward so as to face the flange portion 52 in the optical axis direction JD. Further, as shown in fig. 5B, the coil 3 is supported by the coil support portion 12j and wound around the outer peripheral surface side of the lens holding member 2 in an octagonal ring shape so as to be sandwiched between the flange portion 52 and the flange portion 12h in the optical axis direction JD.

The flange portion 52 projects radially outward from the outer peripheral surface of the cylindrical portion 12 on the imaging element side (Z2 side). The coil 3 is disposed on the object side of the flange portion 52. As shown in fig. 6B, 2 notches 52k are formed in the flange portion 52 so as to sandwich the optical axis of the lens body. Further, the wire material on the winding start end side of the coil 3, i.e., the extension portion 33A, is inserted through one of the cutout portions 52k, and the wire material on the winding end side of the coil 3, i.e., the extension portion 33B, is inserted through the other of the cutout portions 52 k. The edge portion of the flange portion 52 forming the notch portion 52k is configured to be bent. This is to prevent or suppress the wire breakage of the coil 3 contacting the edge portion.

As shown in fig. 6A, the flange portion 52 includes: 2 holding portions 72 protruding downward (Z2 direction) from the surface on the imaging element side (Z2 side) and having a square convex shape; 6 protruding parts 2t in a circular convex shape; and 2 bank portions 82 formed of 3 wall portions (inner wall portion 82u, outer wall portion 82v, side wall portion 82 w).

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

The holding portion 72 is preferably quadrangular prism-shaped as shown in fig. 6A. In this case, the edge between the side where the wire is initially contacted and the side where the 2 nd contact is located among the edges corresponding to the 4 sides, respectively, is preferably bent. The bent edge can prevent the wire of the coil 3 from being applied with excessive force to the surface of the wire in contact with the edge when the wire is wound around the holding portion 72. The other 3 edges may be formed to be upright (not bent).

As shown in fig. 6A and 10A, the protruding portion 2t includes: 3 protruding portions 2t corresponding to the lower leaf spring 26A; and 3 protruding portions 2t corresponding to the lower leaf spring 26B. An inner portion 26i of each of the

lower leaf springs

26A and 26B is attached and fixed to the protruding portion 2 t. The inner portions 26i of the

lower leaf springs

26A and 26B are fixed by hot caulking or cold caulking the protruding portions 2t inserted through the through holes formed in the inner portions 26 i. In the figure, the protruding portion 2t is shown in a state in which the tip is deformed after the hot caulking or the cold caulking.

The levee 82 includes, as shown in fig. 6A: 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 and opposed 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 holding portion 72. As shown in fig. 9A, an opening 82z having a wall cutout is formed on the side of the levee portion 82 remote from the holding portion 72. Further, a space surrounded by 3 wall portions (inner wall portion 82u, outer wall portion 82v, and side wall portion 82w) forms a housing portion 82 s. The housing portion 82s is configured to be able to house a conductive adhesive that connects the

extension portions

33A, 33B of the coil 3 and the

lower leaf springs

26A, 26B. In the present embodiment, the bank portion 82 is formed at a position adjacent to the holding portion 72, and therefore, the side wall of the holding portion 72 is suitably used as the side wall portion 82w of the bank portion 82. Thus, the receiving portion 82s is provided at a position adjacent to the holding portion 72.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10B, the drive mechanism MK includes: a coil 3; and 2 magnets 5 arranged to face the pair of 2 nd side plate portions 4a2 constituting the casing 4. Further, the driving mechanism MK generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and moves the lens holding member 2 up and down in the optical axis direction JD.

The coil 3 is formed by winding a conductive wire around the outer periphery of the lens holding member 2 as shown in fig. 6B. The coil 3 includes: a winding portion 13 formed by winding in an octagonal annular shape; and an extension portion 33 extending from the winding portion 13 and wound around the holding portion 72. In fig. 6B, the winding portion 13 is not illustrated in detail in a state of winding a conductive wire material whose surface is covered with an insulating member for clarity. The same applies to other drawings illustrating the winding portion 13.

The extension 33 includes: an extended portion 33A connected to an end portion (winding start end portion) of the winding portion 13 located on the inner circumferential side of the winding portion 13 on the winding start end side of the coil 3; and an extension portion 33B connected to an end portion (winding terminal portion) of the winding portion 13 located on the outer peripheral side of the winding portion 13 on the winding terminal side of the coil 3.

Specifically, the extension 33A includes, as shown in fig. 9A: a winding portion 33m wound around the holding portion 72A; a connecting portion 33c extending to face the inner bottom surface of the housing portion 82 s; and an insertion portion 33k inserted through the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 toward the object side (Z1 side). The extension 33B includes, as shown in fig. 9B: a winding portion 33m wound around the holding portion 72B; a connecting portion 33c extending to face the inner bottom surface of the housing portion 82 s; and an insertion portion 33k inserted through the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 toward the object side (Z1 side).

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

Next, the wire is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 9A, the wire extending from the winding portion 33m faces the inner bottom surface of the housing portion 82s and passes through the opening 82z whose wall is cut out. Further, the wire rod passes through the notch 52k from the lower side of the flange 52 and extends toward the upper side of the flange 52. At this time, the portion facing the inner bottom surface of the receiving portion 82s constitutes the connecting portion 33c of the extending portion 33A, and the portion passing through the notch 52k constitutes the insertion portion 33k of the extending portion 33A.

The insertion portion 33k of the extension portion 33A is configured to contact the edge portion of the flange portion 52 when extending from the lower side to the upper side of the flange portion 52 as shown in fig. 9A. Therefore, when a strong impact is applied to the lens driving device 101 due to dropping or the like, the extending portion 33A of the coil 3 is pressed against the edge portion of the flange portion 52. In the present embodiment, the edge portion of the flange portion 52 is configured to be curved. Therefore, the extending portion 33A is hardly cut by the edge portion of the flange portion 52. The edge portion of the flange portion 52 that contacts the extension portion 33B may also be curved.

The winding portion 13 of the coil 3 wound around the outer periphery of the lens holding member 2 is disposed at a position surrounding the periphery of the lens holding member 2 as shown in fig. 5B. The winding portion 13 is supported from the inside by the coil support portion 12j (see fig. 5A), and is sandwiched between the flange portion 52 and the brim portion 12h, and is fixed to the object side of the flange portion 52. Since the inner peripheral surface of the winding portion 13 is supported by the coil support portion 12j in an isotropic balance manner, the winding portion 13 is held by the lens holding member 2 in a state where the central axis of the coil 3 coincides with the central axis of the lens holding member 2. Therefore, the optical axis of the lens body held by the lens holding member 2 is configured to easily coincide with the central axes of the lens holding member 2 and the coil 3.

When winding of the linear material around the outer periphery of the lens holding member 2 is completed, the extension portion 33B connected to the end portion on the winding terminal side of the winding portion 13 is drawn out from the object side of the flange portion 52 toward the imaging element side of the flange portion 52 via the notch portion 52k as shown in fig. 9B. Specifically, the insertion portion 33k passes through the notch portion 52k and the connection portion 33c passes through the opening portion 82z of the protruding bank portion 82 and extends to face the inner bottom surface of the housing portion 82s, and the winding portion 33m is wound around the holding portion 72B of the lens holding member 2. In the example shown in fig. 9B, the extending portion 33B is wound around the holding portion 72B by 3 turns.

In the bank portion 82, an opening portion 82z having a wall portion cut out is formed on the side away from the holding portion 72B. The connection portion 33c of the extension portion 33B extends through the opening 82 z. With this configuration, interference between the banks 82 and the extending portions 33B and an increase in the interval between the lens holding member 2 and the lower plate spring 26B can be avoided, and an increase in the size of the lens driving device 101 in the optical axis direction JD can be suppressed.

Next, the case 4 will be explained. In the present embodiment, the case 4 is manufactured by punching and drawing a plate material made of a nonmagnetic metal such as austenitic stainless steel. Since the housing 4 is formed of a nonmagnetic metal, even when another lens driving device is disposed adjacent to the lens driving device 101 in a portable device of a twin-lens camera type or the like, the configuration of the driving machine included in the other lens driving device is not adversely affected in terms of magnetism. Specifically, the housing 4 has a box-like outer shape defining the housing portion 4s as shown in fig. 1. Further, the housing 4 includes: a rectangular annular outer wall portion 4A; and a flat upper surface portion 4B provided continuously to an upper end (end on the Z1 side) of the outer wall portion 4A. In the upper surface portion 4B, a plurality of (4 in the present embodiment) receiving portions are formed at portions facing the magnets 5. The receiving portion is formed such that its upper surface (surface on the Z1 side) is recessed, that is, its lower surface (surface on the Z2 side) protrudes toward the magnet 5 side (Z2 side). The case 4 configured in this way accommodates the coil 3 and the magnet 5 in the housing portion 4s as shown in fig. 10B, and is coupled to the base member 18 to form a housing together with the base member 18 as shown in fig. 2A and 2B. However, the case 4 may be replaced with a cover made of a magnetic metal such as iron. In this case, the housing 4 functions as a yoke.

Next, the magnet 5 constituting the drive mechanism MK will be described. The magnet 5 has a rectangular parallelepiped shape as shown in fig. 1, and is arranged to extend in a direction (X-axis direction) perpendicular to the optical axis direction JD. Further, as shown in fig. 10B, the 2 magnets 5 are located outside the coil 3 and are arranged along the pair of 2 nd side plate portions 4a2 constituting the case 4. Further, the magnet 5 is fixed to the inner surfaces of the pair of 2 nd side plate portions 4a2 with an adhesive. The magnet 5 is disposed, for example, so that the inside is an N pole and the outside is an S pole. The magnet 5 is not disposed along the non-magnetic 1 st side plate 4a 1. Therefore, even when another lens driving device is disposed adjacent to the X1 side or the X2 side of the lens driving device 101 in a two-lens camera type portable device or the like, the magnet 5 does not have a magnetic adverse effect on the other lens driving device.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 11A and 11B are diagrams for explaining the plate spring 6. Fig. 11A is a plan view of the upper leaf spring 16, and fig. 11B is a bottom view of the lower leaf spring 26. Fig. 12A and 12B are diagrams illustrating an example of a connection state 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 X2 side. In fig. 12A and 12B, the conductive adhesive CA is shown in a cross-hatched pattern for the sake of easy understanding. Fig. 13A and 13B are views for explaining base member 18 as stationary-side member RG. Specifically, fig. 13A is an upper perspective view of the base member 18, and fig. 13B is an upper perspective view of a state in which the lower leaf spring 26 is assembled to the base member 18.

The plate spring 6 is made of a metal plate having a copper alloy as a main material. As shown in fig. 1, the plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the housing 4; 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 is supported in the air by the lens holding member so that the lens holding member 2 can move in the optical axis direction JD (Z-axis direction). The lower plate spring 26 functions as a power supply member for supplying current to the coil 3. Therefore, the lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. A spacer member may be disposed between the upper leaf spring 16 and the housing 4. This is to prevent the lens holding member 2 from colliding with the housing 4 when the lens holding member 2 moves in the Z1 direction.

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 as a fixed-side support portion fixed to fixed-side member RG; and 4 resilient arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the 2 inner portions 16i are disposed to face each other across the center. The outer portion 16e has: 4 corner portions 16 b; and 2 landing leg portions 16r connecting 2 of the 4 corner portions 16 b. The bridge 16r is sandwiched and fixed between the receiving portion of the housing 4 and the magnet 5. The housing 4 and the magnet 5 function as a fixed-side member RG.

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.). Further, the inner portion 16i and the base portion 12d are fixed by an adhesive, whereby the inner portion 16i is fixed to the lens holding member 2. As shown in fig. 4B, the outer portion 16e is in contact with the upper surface (surface on the Z1 side) of the magnet 5, and is sandwiched and fixed between the magnets 5 of the case 4.

The upper leaf spring 16 is formed substantially bilaterally symmetrically as shown in fig. 11A. Further, the inner portion 16i is fixed to the lens holding member 2, and the outer portion 16e is fixed to the housing 4. 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 lower leaf spring 26A and the lower leaf spring 26B are configured such that their inner shapes are semicircular. Further, the lower leaf spring 26A and the lower leaf spring 26B include: an inner portion 26i as a movable side support portion fixed to the image pickup element side of the lens holding member 2; an outer portion 26e as a fixed-side support portion fixed to fixed-side member RG; and 2 resilient arm portions 26g located between the medial portion 26i and the lateral portion 26 e.

As shown in fig. 11B, the inner portion 26i of each of the

lower leaf springs

26A and 26B includes: 3 inner bonding portions 26c to be engaged with the lens holding member 2; 2 1 st joint portions 26p connecting between the 3 inner joint portions 26 c; and a web portion 26h opposed to the extension portion 33 of the coil 3.

When the

lower leaf springs

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

26A and 26B are fixed to the lens holding member 2 by, for example, hot 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 about the lower leaf spring 26A is also applied to the lower leaf spring 26B.

As shown in fig. 12B, the connecting plate portion 26h of the inner portion 26i of the lower leaf spring 26A faces the bank portion 82 of the lens holding member 2 when the lens driving device 101 is assembled. That is, the surface of the land portion 26h on the object side (Z1 side) faces the housing portion 82s formed by the bank portion 82 as shown in fig. 12A. Further, as shown in fig. 12B, the connection portion 33c of the extension portion 33A of the coil 3 extends through between the object-side surface of the inner portion 26i of the lower plate spring 26A and the imaging element-side (Z2-side) surface of the flange portion 52 of the lens holding member 2.

As shown in fig. 12A, the connecting plate portion 26h of the inner portion 26i is provided with a through portion 26t cut out from both sides at a position facing the opening portion 82z of the levee portion 82, and is provided with a U-shaped (semicircular) notch portion 26k at a position facing the outer wall portion 82 v. The through portion 26t is provided at a position corresponding to each end portion of the inner wall portion 82u and the outer wall portion 82v of the bank portion 82 in a bottom view, and is provided so that a wall end surface 26x constituting the through portion 26t covers these end portions. With this arrangement, the penetrating portion 26t prevents the conductive adhesive CA from flowing on the surface of the lower leaf spring 26A on the Z1 side and spreading to the Y2 side. The notch 26k is formed at a position corresponding to the receiving portion 82 s. According to this arrangement, the notch 26k prevents the conductive adhesive CA from flowing on the surface of the lower leaf spring 26A on the Z1 side and spreading to the outer wall portion 82v side (X2 side). That is, the notch 26k makes the conductive adhesive CA easily spread toward the inner side wall portion 82u (X1). This is for covering the entire periphery of the connection portion 33c with the conductive adhesive CA.

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

The lower plate spring 26A and the extension 33A of the coil 3 are electrically and mechanically 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 holder 2, the housing portion 82s surrounded by the bank portion 82 of the lens holder 2 is filled with the conductive adhesive CA, and then the lower plate spring 26A is assembled to the lens holder 2. Further, the protruding portion 2t of the lens holding member 2 is subjected to hot caulking or cold caulking, and the conductive adhesive CA is thermally cured. The filling of the housing portion 82s with the conductive adhesive CA is performed in a state where the lens holding member 2 is turned upside down so that the holding portion 72 protrudes vertically upward until the conductive adhesive CA is thermally cured. Therefore, the conductive adhesive CA can be appropriately held at a desired position (position within the housing portion 82 s) even when it has fluidity. Further, since a part of the connection portion 33c is disposed in the housing portion 82s, it is buried in the conductive adhesive CA. The conductive adhesive CA is not limited to the heat-curable type, and may be an ultraviolet-curable type.

The lower plate spring 26A and the extending portion 33A of the coil 3 may be electrically connected to each other by soldering, not by the conductive adhesive CA. In this case, the brazing material is disposed on the Z2 side of the lower plate spring 26A, and electrically connects the lower plate spring 26A and the extension portion 33A.

As shown in fig. 11B, the outer portion 26e of the lower leaf spring 26A includes 2 outer engagement portions 26d that engage with the base member 18. In the present embodiment, a coupling member that couples the 2 outer joining portions 26d is omitted for miniaturization. The through hole provided in the outer engagement portion 26d of the lower leaf spring 26A is fitted into a projection 18t (see fig. 13A) provided on the upper surface of the base member 18. Thereby, the outer portion 26e of the lower leaf spring 26A is positioned and fixed to the base member 18.

The lower leaf spring 26A and the lower leaf spring 26B are formed substantially bilaterally symmetrically as shown in fig. 11B. Further, the lower plate spring 26A is connected to the lens holding member 2 at 3 inner engaging portions 26c and connected to the base member 18 at 2 outer engaging portions 26 d. In the present embodiment, the lower leaf spring 26A is connected to the base member 18 via the metal member 7 at the portion of the outer joining portion 26d1 by welding, and is connected to the base member 18 at the portion of the outer joining portion 26d2 by a thermosetting adhesive. 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 in a state of being movable in the optical axis direction JD with good balance.

Next, stationary-side member RG will be described. The fixed-side member RG includes: a housing 4 and a magnet 5 for fixing the upper plate spring 16; and a base member 18 that fixes the lower plate spring 26A and the lower plate spring 26B, respectively.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, the base member 18 is a member having a rectangular plate-like outer shape as shown in fig. 13A, and a circular opening 18k is formed at the center. Further, 6 projecting portions 18t projecting upward are provided on the 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 circular through hole provided in the outer joining portion 26d of each of the lower plate spring 26A and the lower plate spring 26B. At this time, the projecting portion 18t is fixed to the outer joint portion 26d by hot caulking or cold caulking. In fig. 13A and 13B, the protruding portion 18t is shown in a state in which the tip is deformed after hot caulking or cold caulking. The same applies to the drawings from fig. 14 onward.

Specifically, as shown in fig. 13A, the base member 18 has a receiving surface 18R and a side wall surface 18W. The receiving surface 18R that supports the lower plate spring 26 is a surface perpendicular to the optical axis direction JD, and is divided into 6 parts. The side wall surface 18W is 4 surfaces facing the inner surface 4AS (see fig. 1) of the outer wall portion 4A constituting the housing 4. As shown in fig. 11B, each of the lower leaf spring 26A and the lower leaf spring 26B has a through hole through which a plurality of protruding portions 18t formed on the receiving surface 18R are inserted, and the plurality of protruding portions 18t are configured to be subjected to hot caulking or cold caulking. That is, the distal end portion of the columnar projecting portion 18t is in a crushed state and is configured to expand radially outward from a range occupied by the initial columnar portion.

The lower leaf spring 26 is fixed to the base member 18 by welding or an adhesive after the protruding portion 18t is fixed to the outer joining portion 26d by hot caulking or cold caulking. Specifically, the outer joint portion 26d1 is fixed to the base member 18 via the metal member 7 by welding, and the outer joint portion 26d2 is fixed to the base member 18 by a thermosetting adhesive.

More specifically, as shown in fig. 11B, the lower plate spring 26A has 1 through hole through which the projection 18t is inserted in the outer joining portion 26d1 that is a portion welded to the metal member 7, and the lower plate spring 26A has 2 through holes through which the projection 18t is inserted in the outer joining portion 26d2 that is bonded to the base member 18 with an adhesive. When only 1 through hole is formed in the outer joining portion 26d2, the lower leaf spring 26A may rotate or move in parallel around the projection 18t inserted through the 1 through hole and swaged until the adhesive is applied or when the adhesive is peeled off. The 2 through holes formed in the outside engaging portion 26d2 have an effect of suppressing or preventing the rotation and the parallel movement. However, the number of through holes formed in the outer joining portion 26d2 may be 1.

As shown in fig. 13A, the metal member 7 made of a metal such as copper or iron or an alloy containing these as a main component is embedded in the base member 18 by insert molding. The metal member 7 includes a terminal 7A and a terminal 7B, and the terminal 7A and the terminal 7B are exposed on the upper surface (surface on the Z1 side) of the base member 18 at the exposed portions 7A1 and 7B1, respectively. Further, the terminal 7A and the terminal 7B, which are electrically insulated from each other, are electrically connected to a substrate (not shown) on which the imaging element is mounted. The terminal 7A is electrically connected to the lower leaf spring 26A at the exposed portion 7A1 by welding or the like, and the terminal 7B is electrically connected to the lower leaf spring 26B at the exposed portion 7B1 by welding or the like. The lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. Therefore, the coil 3 can receive the supply of current via the

terminals

7A and 7B and the

lower leaf springs

26A and 26B.

The base member 18 is also embedded with a connecting member 7D formed by insert molding of a metal containing copper, iron, or an alloy containing these as a main component, as in the case of the

terminals

7A and 7B. As shown in fig. 2A, the connecting member 7D is partially exposed from the base member 18 so as to face lower end portions of four corners of the housing 4. The base member 18 is positioned by combining the inner surface 4AS (see fig. 1) of the outer wall portion 4A of the housing 4 and the side wall surface 18W of the base member 18, and then the connecting members 7D are welded to the lower end portions of the four corners of the housing 4 and fixed to the housing 4. The lower surface (end surface on the Z2 side) of the outer wall portion 4A is configured to contact the upper surface (end surface on the Z1 side) of the flange portion 18F (see fig. 13A) of the base member 18. In addition, the connection member 7D is connected to the terminal 7C.

Next, the adhesion of the housing 4, the base member 18, and the lower leaf spring 26A will be described with reference to fig. 14A to 14D, fig. 15A, 15B, 16A, 16B, 17A, 17B, 18A, and 18B.

Fig. 14A to 14D are views of the base member 18 and the lower leaf spring 26A. Fig. 14A is a rear view of the base member 18 and the lower leaf spring 26A as viewed from the direction Y1, and a part of the outline of the outer wall portion 4A constituting the housing 4 is additionally shown by a broken line. Fig. 14B corresponds to an enlarged plan view of a portion Q of fig. 13A, and a part of the cross section of the outer wall portion 4A is additionally shown by a diagonal hatching pattern. In fig. 14B, the lower leaf spring 26A is not shown for clarity. Fig. 14C shows a cross section when the YZ plane including the line segment L1 in fig. 14A is viewed from the X1 side. Fig. 14D shows a cross section when the YZ plane including the line segment L2 in fig. 14A is viewed from the X2 side. Fig. 14C and 14D show a part of the outer wall 4A.

Fig. 15A and 15B are partial plan views of the base member 18 and the lower leaf spring 26A. Fig. 15A is an enlarged top view of a portion R of fig. 13B. Fig. 15B is an enlarged view of a portion U of fig. 15A, and a portion of an inner surface 4AS constituting the outer wall portion 4A of the case 4 is additionally shown by a dashed-dotted line. In fig. 15A and 15B, the upper surface (surface on the Z1 side) of the lower leaf spring 26A is shown in a dot pattern for clarity. The same applies to fig. 16A to 18A. In fig. 15B, a part of the lower leaf spring 26A (the projection 26dt) is shown not in a dot pattern but in a cross-hatched pattern.

Fig. 16A to 18A and 16B to 18B show a state in which the adhesive AD applied to the side wall surface 18W of the base member 18 spreads toward the lower leaf spring 26A. Fig. 16A to 18A are upper perspective views of corner portions of the base member 18 and the lower leaf spring 26A. In fig. 16A to 18A, the illustration of the case 4 is omitted for clarity. Fig. 16B to 18B are sectional views of the housing 4, the base member 18, and the lower leaf spring 26A, and correspond to fig. 14C. In fig. 16A to 18A and 16B to 18B, the adhesive AD is shown by a cross-hatched pattern, and is expanded in the order of fig. 16A, 17A, and 18A and the order of fig. 16B, 17B, and 18B. Fig. 16B corresponds to fig. 16A, fig. 17B corresponds to fig. 17A, and fig. 18B corresponds to fig. 18A. The adhesive AD is applied to the side wall surface 18W in a state where the lens driving device 101 is actually assembled, that is, in a state where the housing 4 is attached to the base member 18 and a surface of the housing 4 on the Y1 side is directed vertically upward. For example, the worker applies the adhesive AD to the side wall surface 18W in a state where the worker views the surface of the 2 nd side plate portion 4a2 on the Y1 side from directly above as shown in fig. 2B. The adhesive AD is, for example, an insulating thermosetting adhesive.

AS shown in fig. 14A, 1 of the 4 side wall surfaces 18W constituting the base member 18 (surface on the Y1 side) has 2 raised portions 18B (18B1, 18B2) raised toward the inner surface 4AS of the housing 4. In fig. 14A, 2 bumps 18B (18B1, 18B2) are shown in a dotted pattern.

One end portion 18BU of the bulge portion 18B1 is disposed closer to the receiving surface 18R than the other end portion 18 BD. That is, the one end portion 18BU is disposed close to the receiving surface 18R so as to be covered by the outer wall portion 4A constituting the housing 4. The other end portion 18BD is exposed from the outer wall portion 4A constituting the housing 4. In this way, the ridge portion 18B1 is formed on the 1 side wall surface 18W so as to extend in the optical axis direction JD. Therefore, the bulge portion 18B1 functions as a guide portion for guiding the adhesive AD applied to the other end portion 18BD side toward the one end portion 18BU side, i.e., toward the receiving surface 18R side. One end portion 18BU located at a different height from the other end portion 18BD in the optical axis direction JD is disposed inside the outer wall portion 4A of the housing 4. That is, one end portion 18BU of ridge portion 18B1 is arranged to face inner surface 4 AS. The same applies to the ridge portion 18B 2.

As shown in fig. 14A, a cutout 4k is formed in the outer wall 4A of the housing 4 to expose a part of the side wall surface 18W located on both sides of the protrusion 18B. The adhesive AD is applied to a portion of the sidewall surface 18W (including a portion of the ridge portion 18B) exposed through the notch portion 4 k. With this structure, the adhesive AD applied to a part of the side wall surface 18W can enter the X1 side and the X2 side of the ridge portion 18B covered by the outer wall portion 4A.

Specifically, AS shown in fig. 16A and 16B, the adhesive AD is applied to a portion (the other end 18BD and a portion adjacent to the other end 18BD) of the ridge portion 18B1, and flows into a space (gap) between the inner surface 4AS of the outer wall portion 4A of the housing 4 and the side wall surface 18W of the base member 18. In the present embodiment, a portion of the side wall surface 18W adjacent to the other end portion 18BD is inclined at a descending slope from the Z2 side toward the Z1 side as shown in fig. 14C. This descending slope promotes the entry of the adhesive AD into the space between the inner surface 4AS and the side wall surface 18W.

Then, the adhesive AD spreads by its surface tension (capillary phenomenon) so as to approach the lower leaf spring 26A along the side wall surfaces 18W located on both sides of the ridge portion 18B1 as shown in fig. 17A and 17B. That is, the bulge portion 18B1 has a function of securing a gap between the inner surface 4AS of the outer wall portion 4A and the side wall surface 18W of the base member 18 so that the adhesive AD can spread by capillary action or the like. The bulge portion 18B1 functions as a guide portion for guiding the adhesive AD from the other end portion 18BD side to the one end portion 18BU side located close to the receiving surface 18R.

AS shown in fig. 15B, the lower leaf spring 26A has a protruding portion 26dt protruding from the edge of the receiving surface 18R toward the inner surface 4AS constituting the outer wall portion 4A of the housing 4 at a portion facing the one end portion 18BU of the bulging portion 18B 1. In fig. 15B, the edge of the receiving surface 18R that supports the lower leaf spring 26A is shown by a broken line, and the projection 26dt projecting from the edge is shown by a cross-hatched pattern. As shown in fig. 11B, the protruding portion 26dt is provided at the outer side joining portion 26d2 located on the opposite side of the outer side joining portion 26d1 where the lower side plate spring 26A is welded to the metal member 7. The protruding portion 26dt is arranged so that the adhesive AD that moves toward the lower leaf spring 26A along the side surfaces (the surface on the X1 side and the surface on the X2 side) of the bump portion 18B1 easily adheres to the lower leaf spring 26A. That is, protrusion 26dt is disposed close to one end 18BU of bulge 18B 1.

In the present embodiment, the protruding portion 26dt is configured such that the distance G1 between the inner surface 4AS and the protruding portion 26dt is smaller than the distance G2 between the receiving surface 18R and the inner surface 4AS, AS shown in fig. 15B. With this configuration, the protruding portion 26dt can more reliably attach the adhesive AD that approaches the protruding portion 26dt along the ridge portion 18B to the lower leaf spring 26A. As a result, the adhesive AD can enter the lower side (Z2 side) of the lower leaf spring 26A. This is because the lower leaf spring 26A can slightly move in the Z-axis direction at this stage. Further, in the lower leaf spring 26A, the space between the inner surface 4AS and the protruding portion 26dt is filled with the adhesive AD by reducing the distance G1. Fig. 18B shows a state in which the space between the inner surface 4AS and the projection 26dt is filled with the adhesive AD. As a result, the case 4 and the lower leaf spring 26A are directly bonded by the adhesive, and the relative movement of the lower leaf spring 26A with respect to the case 4 can be more reliably prevented. In the present embodiment, the distance G1 is about 70 to 110 μm, and the distance G2 is about 150 to 200 μm.

The width W1 of the projection 26dt is greater than the width W2 of the bump 18B 1. The protruding portion 26dt extends over the entire width of the bulge 18B 1. That is, the end of the protruding portion 26dt on the X1 side is located closer to the X1 side than the end of the protruding portion 18B1 on the X1 side, and the end of the protruding portion 26dt on the X2 side is located closer to the X2 side than the end of the protruding portion 18B1 on the X2 side. With this configuration, the lower leaf spring 26A can reliably attach the adhesive AD that approaches the protruding portion 26dt along the X1 side of the ridge portion 18B1 and the adhesive AD that approaches the protruding portion 26dt along the X2 side of the ridge portion 18B1 to the protruding portion 26 dt.

In the present embodiment, an edge surface 18C is formed between the receiving surface 18R and the side wall surface 18W. The edge surface 18C is a surface perpendicular to the optical axis direction JD, and is formed on the Z2 side of the receiving surface 18R as shown in fig. 14C. That is, the receiving surface 18R protrudes more toward Z1 than the edge surface 18C. The projection amount of the receiving surface 18R toward the Z1 side with respect to the edge surface 18C is, for example, about 40 to 60 μm. A curved surface is formed between the receiving surface 18R and the edge surface 18C. With this structure, the base member 18 can cause the adhesive AD that approaches the protrusion 26dt along the bump 18B1 to enter the lower side (Z2 side) of the lower leaf spring 26A. As a result, the adhesive AD that has entered the lower side (Z2 side) of the lower leaf spring 26A can spread along the lower surface (Z2 side) of the lower leaf spring 26A.

Specifically, as shown in fig. 18A and 18B, the adhesive AD crosses the edge surface 18C of the base member 18, adheres to the projection 26dt, and enters between the lower leaf spring 26A and the receiving surface 18R formed in the base member 18. In fig. 18A, the adhesive AD that has entered between the lower plate spring 26A and the receiving surface 18R is shown in a cross-hatched pattern so as to be distinguished from the adhesive AD that has not entered between the lower plate spring 26A and the receiving surface 18R.

In this way, the adhesive AD is applied to the other end portion 18BD side of the bulging portion 18B1, and spreads between the receiving surface 18R and the lower leaf spring 26A via the one end portion 18BU side of the bulging portion 18B1, thereby adhering the housing 4, the base member 18, and the lower leaf spring 26A.

Therefore, the adhesive AD cured by heating is continuously provided from the other end portion 18BD side of the raised portion 18B1 serving as the guide portion to between the receiving surface 18R and the lower leaf spring 26A. The same applies to the adhesion of the lower leaf spring 26B disposed on the X1 side of the base member 18. Therefore, the description about the adhesion of the lower leaf spring 26B is omitted. The lower leaf spring 26B is bonded to the housing 4 and the base member 18 via a ridge portion 18B2 (see fig. 14A).

As described above, the lens driving device 101 according to the embodiment of the present invention includes: a base member 18; a housing 4 having a cylindrical outer wall portion 4A and fixed to the base member 18; a lens holding member 2 capable of holding a lens body; a plate spring 6 that supports the lens holding member 2 disposed in the housing 4 so as to be movable in the optical axis direction JD; and a drive mechanism MK that moves the lens holding member 2 in the optical axis direction JD. The base member 18 has: a receiving surface 18R perpendicular to the optical axis direction JD; and a side wall surface 18W opposed to the inner surface 4AS of the outer wall portion 4A of the housing 4. The receiving surface 18R supports the lower leaf spring 26A and the lower leaf spring 26B as the leaf spring 6. The side wall surface 18W has a raised portion 18B raised toward the inner surface 4AS a guide portion for guiding the adhesive AD toward the receiving surface 18R. One end portion 18BU of the bulging portion 18B is disposed inside the outer wall portion 4A and closer to the receiving surface 18R than the other end portion 18 BD. The other end portion 18BD is disposed to be exposed from the outer wall portion 4A. The lower plate spring 26A is fixed to the base member 18 and the case 4 by an adhesive AD applied to the other end portion 18BD side of the bulging portion 18B and spreading between the receiving surface 18R and the lower plate spring 26A via the one end portion 18BU side of the bulging portion 18B. The same applies to the lower leaf spring 26B. With this configuration, the worker who assembles the lens driving device 101 can apply the adhesive AD in a state where the base member 18 is covered with the housing 4. Therefore, even if the lens driving device 101 is miniaturized, the operator can easily bond the housing 4, the plate spring 6, and the base member 18 with the adhesive AD. Further, the adhesive used for bonding the case 4 and the base member 18 and the adhesive used for bonding the plate spring 6 and the base member 18 can be shared. Therefore, the worker can bond the plate spring 6 to the base member 18 with the adhesive used for bonding the housing 4 to the base member 18. This enables simplification of the manufacturing process.

The lower plate spring 26A may have a protruding portion 26dt protruding from the edge of the receiving surface 18R toward the inner surface 4AS at a portion facing the one end portion 18BU of the bulging portion 18B. In this case, the one end portion 18BU and the protruding portion 26dt are arranged close to each other. According to this configuration, since the distance between inner surface 4AS and lower leaf spring 26A is reduced, adhesive AD applied to the other end portion 18BD side of raised portion 18B and moved along the side surface of raised portion 18B to the one end portion 18BU side of raised portion 18B can be easily attached to lower leaf spring 26A at the portion of protruding portion 26 dt. The same applies to the lower leaf spring 26B.

As shown in fig. 15B, for example, the protruding portion 26dt may be configured to extend over the entire width of the ridge portion 18B. In this case, the width W1 of the protruding portion 26dt is larger than the width W2 of the bump 18B. With this configuration, the adhesive AD that flows on both sides of the ridge portion 18B and moves to the side of the one end portion 18BU of the ridge portion 18B can easily adhere to the lower leaf spring 26A at the portion of the protruding portion 26 dt. The same applies to the lower leaf spring 26B.

AS shown in fig. 15B, for example, the distance G1 between the protruding portion 26dt and the inner surface 4AS may be smaller than the distance G2 between the receiving surface 18R and the inner surface 4 AS. With this configuration, adhesive AD that has moved along bulge 18B to one end 18BU of bulge 18B can easily adhere to the lower surface (surface on the Z2 side) of protrusion 26 dt. Therefore, the adhesive AD can easily enter between the receiving surface 18R of the base member 18 and the lower leaf spring 26A. Further, the adhesive AD having entered between the receiving surface 18R and the lower plate spring 26A can spread along the lower surface (surface on the Z2 side) of the receiving surface 18R and the lower plate spring 26A as shown in fig. 18A and 18B by the surface tension (capillary phenomenon). The same applies to the lower leaf spring 26B.

As shown in fig. 14A, the outer wall portion 4A of the housing 4 may be formed with a cutout portion 4k that exposes side wall surfaces 18W located on both sides of the ridge portion 18B. With this configuration, the worker who applies the adhesive AD can supply the adhesive AD to both sides of the raised portion 18B.

As shown in fig. 13B, the lower leaf spring 26A may have a plurality of through holes through which the plurality of protruding portions 18t formed on the receiving surface 18R are inserted. Further, the plurality of protruding portions 18t may be configured to be caulked. According to this configuration, the rotation or parallel movement of the lower plate spring 26A with respect to the base member 18 can be suppressed in the step before the lower plate spring 26A is fixed to the base member 18 by the adhesive AD. The same applies to the lower leaf spring 26B.

A method for manufacturing a lens driving device according to an embodiment of the present invention includes: a step of connecting the lower plate spring 26 and the lens holding member 2; a step of connecting the base member 18 and the lower plate spring 26 connected to the lens holding member 2; a step of mounting the housing 4 on the base member 18 connected to the lower leaf spring 26; a step of applying an adhesive AD to the other end 18BD side of the ridge portion 18B as a guide portion; and a step of fixing the lower plate spring 26, the base member 18, and the housing 4 with an adhesive AD spreading between the receiving surface 18R and the lower plate spring 26A via the one end portion 18BU side of the bulge portion 18B. According to this method, the worker who manufactures the lens driving device 101 can apply the adhesive AD in a state where the housing 4 is covered on the base member 18. Therefore, the worker can easily bond the case 4, the plate spring 6, and the base member 18 with the adhesive AD. Further, the adhesive used for bonding the housing 4 and the base member 18 can be shared with the adhesive used for bonding the plate spring 6 and the base member 18. Therefore, the worker can bond the plate spring 6 and the base member 18 with the adhesive used for bonding the housing 4 and the base member 18.

The preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments. The above-described embodiments can be variously modified and replaced without departing from the scope of the present invention. Further, the respective features described with reference to the above embodiments may be combined as appropriate as long as there is no technical contradiction.

For example, in the above-described embodiment, the holding portion 72 is configured to protrude from one end portion of the lens holding member 2 (the flange portion 52) in the optical axis direction JD, but the configuration is not limited to this. The holding portion 72 may protrude in a direction (for example, a lateral direction) different from the optical axis direction JD.

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

In the above embodiment, the guide portion for guiding the adhesive AD toward the receiving surface 18R of the base member 18 is formed by the bulging portion 18B bulging from the side wall surface 18W, but the present invention is not limited to this. The guide portion may be, for example, a recess formed in the side wall surface 18W so AS to be apart from the inner surface 4AS of the outer wall portion 4A of the housing 4. The concave portion is preferably formed to extend in the optical axis direction JD as in the case of the ridge portion 18B. However, the recess does not need to extend linearly in parallel to the optical axis direction JD as long as one end portion and the other end portion of the recess are present at different positions in the optical axis direction JD. The same applies to the raised portion 18B.

The present application claims priority based on the japanese patent application No. 2017-242956 filed on 12/19/2017, the entire contents of which are incorporated herein by reference.

Description of the reference numerals

2 … lens holding member; 2t … projection; 3 … coil; 4 … a housing; 4a … outer wall portion; 4a1 … 1 st side plate part; 4a2 … 2 nd side plate part; 4AS … inner surface; 4B … upper surface portion; 4k … notch part; 4s … storage part; 5 … a magnet; 6 … leaf spring; 7 … metal parts; 7A, 7B, 7C … terminals; 7D … connecting members; exposed portions 7a1, 7B1 …; 12 … cylindrical portion; 12d … stand seat; 12dh … recess; 12h … eave; 12j … coil support; 13 … a winding; 16 … upper leaf spring; corner portion 16b …; 16e … outer portion; 16g … resilient arm portions; inner portion of 16i …; 16r … stack bridge; 18 … base member; 18B, 18B1, 18B2 … bumps; 18BD … another end; one end of 18BU …; 18C … edge face; 18F … flange portion; 18k … opening; 18R … bearing surface; 18t … projection; 18W … side wall face; (ii) a 26. 26A, 26B … lower leaf springs; 26c … inner engaging portion; 26d, 26d1, 26d2 … lateral engaging portions; 26dt … projection; 26e … outer portion; 26g … resilient arm portion; 26h … web portions; 26i … inside part; 26k … notch portion; 26p … part 1; 26t … through-hole; 26x … wall end faces; 33. 33A, 33B … extensions; 33c … connection; 33k … insertion part; a 33m … winding; 52 … flange portion; 52k … notch portion; 72. 72A, 72B … holding parts; 82 … levee portions; 82s … enclosure; 82u … inner wall portion; 82v … outer wall portion; 82w … side wall portion; 82z … open; 101 … lens driving device; AD … adhesive; CA … conductive adhesive; JD … optical axis direction; an MK … drive mechanism; RG … side stationary components.

Claims

1. A lens driving device is provided with:

a base member;

a housing having a cylindrical outer wall portion and fixed to the base member;

a lens holding member capable of holding a lens body;

a plate spring including an upper plate spring and a lower plate spring, and supporting the lens holding member disposed in the housing to be movable in an optical axis direction; and

a drive mechanism for moving the lens holding member in the optical axis direction,

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

the base member includes: a receiving surface perpendicular to the optical axis direction and supporting the lower plate spring; and a side wall surface facing an inner surface of the outer wall portion in the housing,

the side wall surface has a guide portion formed such that one end portion and the other end portion are located at different positions in the optical axis direction,

the one end portion of the guide portion is disposed inside the outer wall portion and closer to the receiving surface than the other end portion is, the other end portion is disposed so as to be exposed from the outer wall portion,

the lower leaf spring is fixed to the base member and the housing via an adhesive, and the adhesive is applied to the other end portion side and spreads between the receiving surface and the lower leaf spring via the one end portion.

2. The lens driving device according to claim 1,

the lower plate spring has a protruding portion protruding from an edge of the receiving surface toward the inner surface at a portion facing the one end portion of the guide portion,

the one end portion is disposed close to the protruding portion.

3. The lens driving device according to claim 2,

the width of the protruding part is larger than that of the guiding part,

the protrusion extends beyond the entire width of the guide portion.

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

the distance between the protruding portion and the inner surface is smaller than the distance between the receiving surface and the inner surface.

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

a raised part raised toward the inner surface is formed on the side wall surface,

the protrusion constitutes the guide portion.

6. The lens driving device according to claim 5,

the outer wall of the housing is formed with a notch portion that exposes the side wall surfaces located on both sides of the protrusion.

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

the lower leaf spring has a plurality of through holes for inserting a plurality of protruding portions formed on the receiving surface,

the plurality of protruding portions are configured to be caulked.

8. A camera module having:

a lens driving device;

a lens body; and

an imaging element opposed to the lens body,

the camera module described above is characterized in that,

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

9. A method for manufacturing a lens driving device is provided,

the lens driving device includes: a base member; a housing having a cylindrical outer wall portion and fixed to the base member; a lens holding member capable of holding a lens body; a plate spring including an upper plate spring and a lower plate spring, and supporting the lens holding member disposed in the housing to be movable in an optical axis direction; and a drive mechanism for moving the lens holding member in the optical axis direction,

the method for manufacturing the lens driving device is characterized by comprising the following steps:

connecting the lower plate spring and the lens holding member;

a step of connecting the base member and the lower plate spring connected to the lens holding member, wherein the base member includes: a receiving surface perpendicular to the optical axis direction and supporting the lower plate spring; and a side wall surface facing an inner surface of the outer wall portion in the housing;

a step of mounting the housing on the base member connected to the lower leaf spring;

a step of applying an adhesive to the other end of a guide portion formed on the side wall surface so that one end and the other end are located at different positions in the optical axis direction, the one end being close to the receiving surface and the other end being exposed from the outer wall portion; and

and fixing the lower leaf spring, the base member, and the housing with the adhesive spreading between the receiving surface and the lower leaf spring through the one end portion located inside the outer wall portion.