CN212989746U - Lens driving device and camera module - Google Patents

Abstract

A lens driving device and a camera module which can reduce the manufacturing cost related to the connection structure of a plate spring and an external power supply. The lens driving device (101) includes a base member (18) and a lower plate spring (26A). The lower leaf spring has a 1 st terminal portion (TN1) extending downward from a 1 st outer engaging portion (26d 1). The base member has a 1 st hole (18h1) through which the 1 st terminal is inserted, a 1 st mounting portion (18s1) on which the 1 st outer joint portion is mounted, a 1 st protrusion (18t1) inserted into a 1 st through hole (26t1) formed in the 1 st outer joint portion, and a Groove (GR) formed around the 1 st protrusion. The lens driving device is configured such that an adhesive is disposed between the 1 st terminal portion and the 1 st hole portion, and the adhesive in the groove portion is connected to the adhesive on the upper surface of the 1 st outer bonding portion located outside the 1 st through hole.

Description

Lens driving device and camera module

Technical Field

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

Background

Conventionally, a lens driving device including a lens holding member and a coil arranged on an outer periphery of the lens holding member is known (see patent document 1). In this device, the lens holding member is held by a conductive lower plate spring so as to be movable in the optical axis direction. The inner portion of the lower plate spring is attached to the lens holding member and is connected to the coil by soldering. The outer portion of the lower leaf spring is attached to the base member, and is fixed by adhesion to a terminal attached to the base member with a conductive heat-curable adhesive. The terminal is connected to an external power source via a conductor pattern on the circuit board.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-014890

Problem to be solved by utility model

However, in the lens driving device described above, the lower plate spring and the terminal are configured as separate members. Therefore, in manufacturing the lens driving device, a process of attaching the terminal to the base member and a process of connecting the lower plate spring to the terminal are required. As a result, manufacturing costs may be increased.

SUMMERY OF THE UTILITY MODEL

Therefore, it is desirable to provide a lens driving device capable of suppressing the manufacturing cost associated with the connection structure of the plate spring and the external power supply.

The utility model discloses a lens drive device of embodiment possesses: a housing including a base member and a cover member; a lens holding member capable of holding a lens body; a coil held by the lens holding member; a magnet disposed opposite to the coil; and a leaf spring configured to movably support the lens holding member in an optical axis direction and to connect the base member and the lens holding member, the leaf spring including a fixed-side support portion fixed to the base member, a movable-side support portion fixed to the lens holding member, an elastic arm portion provided between the fixed-side support portion and the movable-side support portion, and a terminal portion extending from the fixed-side support portion and exposed to an outside of the base member, the base member including a hole portion through which the terminal portion is inserted, a placement portion on which the fixed-side support portion is placed, a protrusion inserted into a through portion formed in the fixed-side support portion, and a groove portion recessed from the placement portion around the protrusion, an adhesive being disposed between the terminal portion and the hole portion, and the adhesive in the groove portion is connected to the adhesive on the upper surface of the fixed-side support portion located outside the through portion.

The lens driving device can suppress the manufacturing cost related to the connection structure of the plate spring and the external power supply.

Drawings

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

Fig. 2A and 2B are a top perspective view and a front view of the lens driving device.

Fig. 3A and 3B are a top view and a bottom view of the lens driving device.

Fig. 4A and 4B are top perspective views of the lens driving device with a part of the components removed.

Fig. 5A and 5B are upper perspective views of the lens holding member.

Fig. 6A and 6B are lower perspective views of the lens holding member.

Fig. 7A and 7B are lower perspective views of the lens holding member.

Fig. 8A and 8B are enlarged views of a part of the lens holding member.

Fig. 9A and 9B are bottom views of the lens driving device with a part of the components removed.

Fig. 10A and 10B are plan views of the upper leaf spring and the lower leaf spring.

Fig. 11A, 11B, and 11C are diagrams illustrating an example of a connection structure between the plate spring holding member and the yoke and the upper plate spring in the lens driving device.

Fig. 12A and 12B are diagrams illustrating an example of a connection structure between a lower plate spring and a coil in the lens driving device.

Fig. 13A, 13B, and 13C are upper perspective views of the lower leaf spring and the base member of the lens driving device.

Fig. 14A, 14B, and 14C are perspective views of the lower leaf spring to which the lens holding member and the base member are connected.

Fig. 15A, 15B, 15C, and 15D are enlarged views of the corner of the base member.

Fig. 16A, 16B, and 16C are partial sectional views of the base member.

Fig. 17A and 17B are enlarged views of corners of the base member.

Fig. 18 is an enlarged view of a through hole formed in the outer joint portion.

Fig. 19A and 19B are partial sectional views of the base member.

Detailed Description

Hereinafter, a lens driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of a lens driving device 101. Fig. 2A is an upper perspective view of the lens driving device 101, and fig. 2B is a front view of the lens driving device 101 viewed from the Y2 side. Fig. 3A is a plan view of the lens driving device 101, and fig. 3B is a bottom view of the lens driving device 101. Fig. 4A is an upper perspective view of the lens driving device 101 in a state where the plate spring holding member 1 is removed. Fig. 4B is an upper perspective view of the lens driving device 101 in a state where the upper plate spring 16 is further removed.

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 driving mechanism MK for moving the lens holding member 2 in the optical axis direction (Z-axis direction), a plate spring 6 for movably supporting the lens holding member 2 in the optical axis direction, and a fixing member RG for fixing the plate spring 6. The lens body is, for example, a cylindrical lens barrel including at least 1 lens, and is configured such that the central axis thereof is along the optical axis direction. The optical axis direction includes a direction of an optical axis JD relating to the lens body, and a direction parallel to the optical axis JD.

As shown in fig. 1, the drive mechanism MK includes a coil 3 wound in an octagonal ring shape, a yoke 4 serving as a cover member that is a rectangular box-shaped case and also serves as an outer case, and 4 magnets 5 arranged to face four corners of the yoke 4. In the present embodiment, the magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface. Fixed-side member RG includes plate spring holding member 1, yoke 4, and base member 18. The plate spring 6 includes an upper plate spring 16 connecting the lens holding member 2 and the yoke 4, and a lower plate spring 26 connecting the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a lower leaf spring 26A and a lower leaf spring 26B.

The lens driving device 101 has a substantially rectangular parallelepiped shape, and is mounted on a substrate (not shown) on which an imaging element (not shown) is mounted. The camera module includes a substrate, a lens driving device 101, a lens body attached to the lens holding member 2, and an image pickup element attached to the substrate so as to face the lens body. The coil 3 is connected to a power supply via the lower plate spring 26 and the substrate. When a current flows in the coil 3, the driving mechanism MK generates an electromagnetic force along the optical axis direction.

The lens driving device 101 uses this electromagnetic force to move the lens holding member 2 in the optical axis direction on the Z1 side (object side) of the image pickup device, thereby realizing an autofocus function. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image pickup device to realize macro photography, and moves the lens holding member 2 in a direction closer to the image pickup device to realize infinity photography.

Next, the relationship between the lens holding member 2 and the drive mechanism MK will be described. Fig. 5A is an upper perspective view of the lens holding member 2, and fig. 5B is an upper perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 5A. Fig. 6A is a lower perspective view of the lens holding member 2, and fig. 6B is a lower perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 6A. Fig. 7A is a lower perspective view of the lens holding member 2, and fig. 7B is a lower perspective view of the lens holding member 2 in a state where the coil 3 is wound around the lens holding member 2 shown in fig. 7A. Fig. 8A is an enlarged view of a portion S shown in fig. 7B, and fig. 8B is an enlarged view of a portion P shown in fig. 6B. Fig. 9A is a bottom view of the lens driving device 101 in a state where the base member 18 is removed, and fig. 9B 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 removed.

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 and a flange portion (flange portion) 52, the cylindrical portion 12 is formed to have a through hole along the optical axis direction, and the flange portion (flange portion) 52 is formed at an end portion on the image pickup device side (Z2 side) in the optical axis direction. The end of the cylindrical portion 12 on the object side (Z1 side) in the optical axis direction is formed in a substantially cylindrical shape.

In order to mount the lens body, a thread groove is provided on the cylindrical inner peripheral surface of the cylindrical portion 12. Further, the cylindrical portion 12 is provided with 2 pedestal portions 12d having 2 recesses 12dh on the end surface on the object side across the optical axis JD. As shown in fig. 4A, an 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, 4 coil support portions 12j are arranged so as to be able to support the octagonal ring-shaped coil 3. On the subject side of the coil support portion 12j, 4 radially outwardly projecting eaves 12h are formed so as to face the flange portion 52 in the optical axis direction. As shown in fig. 5B, the coil 3 is wound in an octagonal ring shape around the outer peripheral surface of the lens holding member 2 so as to be supported by the coil support portion 12j and sandwiched between the flange portion 12h and the flange portion 52 in the optical axis direction.

Thus, the flange portion 52 projects radially outward from the outer peripheral surface of the end portion of the cylindrical portion 12 on the imaging element side (Z2 side). The coil 3 is disposed on the subject side of the flange portion 52. As shown in fig. 6B, 2 cutout portions 52k are formed in the flange portion 52 so as to sandwich the optical axis JD of the lens body. The notch 52k is inserted with an extension 33 that is a part of the wire material constituting the coil 3. Specifically, an extension 33A of the wire material on the winding start side of the coil 3 is inserted into one of the notches 52k, and an extension 33B of the wire material on the winding end side of the coil 3 is inserted into the other notch 52 k.

As shown in fig. 6A, the flange portion 52 includes 2 holding portions 72 and 8 projecting portions 2p, the 2 holding portions 72 project downward (Z2 direction) from the surface on the imaging element side (Z2 side) and are square projecting portions, and the 8 projecting portions 2p are circular projecting portions. The protruding portion 2p may be a square convex.

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

As shown in fig. 6A and 9A, the protruding portion 2p includes 4 protruding portions 2p corresponding to the lower leaf spring 26A and 4 protruding portions 2p corresponding to the lower leaf spring 26B. The inner portions 26i of the lower leaf springs 26A and 26B, which are movable side support portions, are positioned and fixed by the protruding portions 2 p. The protruding portion 2p is inserted into a circular hole 26k (see fig. 10B) as a through portion formed in an inner portion 26i (inner engagement portion 26c) of each of the lower plate spring 26A and the lower plate spring 26B. The through-portion may be a hole other than a circular hole such as a rectangular hole or an elliptical hole, or may be a notch, as long as it corresponds to the shape of the protruding portion 2 p.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 9B, the drive mechanism MK includes a coil 3, a yoke 4, and 4 magnets 5 arranged to face four corners of the yoke 4. The driving mechanism MK is capable of moving the lens holding member 2 up and down in the optical axis direction while generating a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5.

As shown in fig. 6B, the coil 3 is formed by winding a conductive wire around the outer periphery of the lens holding member 2. The coil 3 includes a winding portion 13 as a coil body portion 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, for clarity, the winding portion 13 is not shown in detail in a state where a conductive wire material having a surface covered with an insulating member is wound. The same applies to other drawings illustrating the winding portion 13.

The extending portion 33 includes an extending portion 33A and an extending portion 33B, the extending portion 33A is connected to an end portion (winding start portion) of the winding portion 13 located on the inner peripheral side of the winding portion 13 on the winding start side of the coil 3 (winding portion 13), and the extending portion 33B is connected to an end portion (winding end portion) of the winding portion 13 located on the outer peripheral side of the winding portion 13 on the winding end side of the coil 3 (winding portion 13).

Specifically, as shown in fig. 8A, the extending portion 33A includes a winding portion 33m wound around the holding portion 72A, an opposing portion 33c extending to oppose the surface of the flange portion 52 on the image pickup device side (Z2 side), and an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 to the image pickup object side (Z1 side). As shown in fig. 8B, the extending portion 33B includes a winding portion 33m wound around the holding portion 72B, an opposing portion 33c extending to oppose the surface of the flange portion 52 on the image pickup device side (Z2 side), and an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 to the image pickup 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 material of the coil 3 is wound around the outer periphery of the lens holding member 2 (the coil support portion 12j), that is, before the winding portion 13 is formed. In the example shown in fig. 8A, the extension 33A, which is a part of the wire material of the coil 3, is wound 5 times around the holding portion 72A. Thereby, the winding portion 33m is formed in the holding portion 72A, and a part of the extension portion 33A is held in the holding portion 72A. However, the extension 33A may be wound around the holding portion 72A after the wire of the coil 3 is wound around the outer periphery of the lens holding member 2, that is, after the winding portion 13 is formed.

Next, the wire rod is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 8A, the wire extending from the winding portion 33m extends so as to face the bottom surface of the flange portion 52, and passes through the notch portion 52k from the lower side of the flange portion 52 to extend to the upper side of the flange portion 52. At this time, the portion facing the bottom surface of flange 52 constitutes facing portion 33c of extending portion 33A, and the portion passing through notch 52k constitutes insertion portion 33k of extending portion 33A.

As shown in fig. 5B, the winding portion 13 of the coil 3 wound around the outer periphery of the lens holding member 2 is disposed at a position surrounding the periphery of the lens holding member 2. The winding portion 13 is held from the inside by the coil support portion 12j (see fig. 5A), and is sandwiched between the brim portion 12h and the flange portion 52 and fixed to the subject side of the flange portion 52. Further, since the inner peripheral surface of the winding portion 13 is isotropically and uniformly supported by the coil support portion 12j, the winding portion 13 is held by the lens holding member 2 in a state where the central axis of the coil 3 coincides with the central axis of the lens holding member 2. Therefore, the lens driving device 101 is configured to easily align the optical axis JD of the lens body held by the lens holding member 2 with the central axes of the lens holding member 2 and the coil 3, respectively.

When the winding of the wire around the outer periphery of the lens holding member 2 is completed, the extension portion 33B connected to the end portion on the winding end side of the winding portion 13 is drawn out from the object side of the flange portion 52 to the image pickup device side of the flange portion 52 through the notch portion 52k as shown in fig. 8B. Specifically, the insertion portion 33k passes through the notch portion 52k, and the winding portion 33m is wound around the holding portion 72B of the lens holding member 2. In the example shown in fig. 8B, the extending portion 33B is wound around the holding portion 72B by 6 turns.

Next, the yoke 4 constituting the drive mechanism MK will be described. In the present embodiment, the yoke 4 is manufactured by performing press working, drawing working, and the like on a plate material made of a soft magnetic material such as iron. Specifically, as shown in fig. 1, the yoke 4 has a box-like outer shape defining the housing portion 4 s. The yoke 4 includes a rectangular tubular outer wall portion 4A, a flat annular upper surface portion 4B provided continuously to an upper end (one end on the Z1 side) of the outer wall portion 4A, and 4 inner wall portions 4F extending downward (in the Z2 direction) in the optical axis direction from an inner peripheral edge of the upper surface portion 4B. As shown in fig. 9B, the yoke 4 configured as above accommodates the coil 3 and the magnet 5 in the housing portion 4s with the outer wall portion 4A and the inner wall portion 4F interposed therebetween, and as shown in fig. 2A, the yoke 4 is coupled to the base member 18 and constitutes a case together with the base member 18. However, the yoke 4 may be replaced with a cover member made of a nonmagnetic material such as austenitic stainless steel. In this case, the 4 inner wall portions 4F may be omitted.

Next, the magnet 5 constituting the drive mechanism MK will be described. As shown in fig. 1, the magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface. As shown in fig. 9B, the 4 magnets 5 are located outside the coil 3 and are arranged so as to face the four corners of the rectangular-cylindrical outer wall portion 4A constituting the yoke 4. The magnet 5 is fixed to the yoke 4 by an adhesive. The magnet 5 is disposed such that, for example, the inner side (the side facing the optical axis JD) is an N pole and the outer side is an S pole, or the inner side is an S pole and the outer side is an N pole.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 10A and 10B are views illustrating the plate spring 6. Fig. 10A is a plan view of the upper leaf spring 16, and fig. 10B is a plan view of the lower leaf spring 26. Fig. 11A to 11C are diagrams illustrating an example of a connection structure of 3 members (the plate spring holding member 1, the yoke 4, and the upper plate spring 16). Specifically, fig. 11A is a lower perspective view of the plate spring holding member 1. That is, in fig. 11A, 2 (the yoke 4 and the upper plate spring 16) out of the 3 components are not illustrated. Fig. 11B is a lower perspective view of the leaf spring holding member 1 and the upper leaf spring 16. That is, in fig. 11B, illustration of 1 (yoke 4) out of the 3 components is omitted. Fig. 11C is a lower perspective view of the plate spring holding member 1, the yoke 4, and the upper plate spring 16. That is, in fig. 11C, all 3 components are illustrated. Fig. 12A and 12B are diagrams illustrating an example of a connection structure between the lower leaf spring 26A and the coil 3 (the extending portion 33A). Specifically, fig. 12A is an enlarged view of the portion T shown in fig. 9A, 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. 9A is viewed from the X2 side. In fig. 12A and 12B, the solder SD joining the coil 3 and the lower leaf spring 26A is shown by cross hatching. Fig. 13A to 13C are views for explaining base member 18 as fixed-side member RG. Specifically, fig. 13A is an upper perspective view of the lower leaf spring 26 attached to the base member 18. Fig. 13B is an upper perspective view of the base member 18. Fig. 13C is an upper perspective view of the base member 18 with the lower leaf spring 26 attached.

The plate spring 6 is made of a metal plate made of a copper alloy as a main material. The plate spring 6 includes an upper plate spring 16 disposed between the lens holding member 2 and the yoke 4 as shown in fig. 4A, and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18 as shown in fig. 9A and 13C. In a state where the lens holding member 2 is engaged with the respective leaf springs 6 (the upper leaf spring 16, the lower leaf spring 26A, and the lower leaf spring 26B), the leaf springs 6 support the lens holding member 2 so that the lens holding member 2 can move in the optical axis direction (Z-axis direction). The lower plate spring 26 also 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.

As shown in fig. 10A, the upper plate spring 16 is substantially rectangular, and includes an inner portion 16i as a movable side support portion fixed to the lens holding member 2, an outer portion 16e as a fixed side support portion fixed to the fixed side member RG (the plate spring holding member 1 and the yoke 4), and 4 elastic arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the inner portions 16i are provided in 2 numbers facing each other with the optical axis JD interposed therebetween. The outer portion 16e has 4 corner portions 16b and 4 bridge portions 16r connecting adjacent 2 of the 4 corner portions 16 b.

In this way, the upper plate spring 16 is formed substantially bilaterally symmetrically, and is fixed to the lens holding member 2 at the inner portion 16i and to the plate spring holding member 1 and the yoke 4 at the outer portion 16 e. Therefore, when a current flows through the coil 3, the upper plate spring 16 can suspend and support the lens holding member 2 in a balanced manner.

When the upper plate spring 16 is attached to the lens driving device 101, as shown in fig. 4A, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see fig. 5A). The inner portion 16i is bonded to the base portion 12d with an adhesive AD, and the inner portion 16i is fixed to the lens holding member 2. The outer portion 16e is sandwiched between the plate spring holding member 1 and the upper surface portion 4B of the yoke 4 and fixed by an adhesive.

The plate spring holding member 1 is configured to be able to hold the upper plate spring 16 on the subject side (Z1 side) of the yoke 4. Specifically, as shown in fig. 11A, the leaf spring holding member 1 has a rectangular ring shape, and has 4 corners 1c, protrusions 1p protruding downward (Z2 direction) from each corner 1c of the 4 corners 1c, and recesses 1r formed inside the bottom surface (surface on the Z2 side).

The projection 1p is inserted into a circular hole 16k (see fig. 10A) as a through portion formed in the corner portion 16B of the upper plate spring 16, and is inserted into a circular hole 4k (see fig. 4B) as a through portion formed in each of 4 corners constituting the upper surface portion 4B of the yoke 4.

More specifically, as shown in fig. 11A, the projection 1p of the leaf spring holding member 1 includes the 1 st projection 1p1 to the 4 th projection 1p 4. As shown in fig. 4B, the circular holes 4k formed in the yoke 4 include the 1 st circular hole 4k1 to the 4 th circular hole 4k 4. As shown in fig. 10A, the circular holes 16k formed in the upper leaf spring 16 include the 1 st circular hole 16k1 to the 4 th circular hole 16k 4. As shown in fig. 11B, the 1 st protrusion 1p1 is inserted into the 1 st circular hole 16k1 formed in the upper leaf spring 16, the 2 nd protrusion 1p2 is inserted into the 2 nd circular hole 16k2, the 3 rd protrusion 1p3 is inserted into the 3 rd circular hole 16k3, and the 4 th protrusion 1p4 is inserted into the 4 th circular hole 16k 4. Further, as shown in fig. 11C, the 1 st protrusion 1p1 is inserted into the 1 st circular hole 4k1 formed in the upper surface portion 4B of the yoke 4, the 2 nd protrusion 1p2 is inserted into the 2 nd circular hole 4k2, the 3 rd protrusion 1p3 is inserted into the 3 rd circular hole 4k3, and the 4 th protrusion 1p4 is inserted into the 4 th circular hole 4k 4.

Then, the protrusion 1p is hot-riveted. In fig. 11A to 11C, the projection 1p is illustrated in a state where the tip after hot riveting is deformed. The projection 1p may also be cold-riveted.

Thus, the outer portion 16e of the upper plate spring 16 is sandwiched and fixed between the plate spring holding member 1 and the upper surface portion 4B of the yoke 4. In the present embodiment, an adhesive is applied between the corner 1c of the leaf spring holding member 1 and the corner 16B of the outer portion 16e, and between the corner of the upper surface portion 4B and the corner 16B of the outer portion 16 e.

The recess 1r of the leaf spring holding member 1 is configured to allow elastic deformation of the elastic arm portion 16g constituting the upper leaf spring 16. In the present embodiment, the lens holding member 2 is not suspended when no current flows through the coil 3, and is biased toward the image pickup device side (Z2 side) by the plate spring 6, and is in contact with the upper surface (Z1 side) of the base member 18. When a current flows through the coil 3, the lens holding member 2 moves to the object side (Z1 side) by electromagnetic force, and is separated from the base member 18 and held in a floating state. At this time, the portion of the elastic arm portion 16g of the upper leaf spring 16 that contacts the inner portion 16i is displaced upward (Z1 direction). The recess 1r of the leaf spring holding member 1 is formed to allow this displacement.

As shown in fig. 4A, the lens holding member 2 has an upper end that protrudes upward (Z1 direction) from the upper surface portion 4B of the yoke 4 even when no current flows through the coil 3. Therefore, the concave portion 1r of the plate spring holding member 1 is formed so as to allow further protrusion of the lens holding member 2 when a current flows through the coil 3, in addition to the displacement of the elastic arm portion 16 g.

As shown in fig. 10B, the lower leaf spring 26A and the lower leaf spring 26B are formed substantially bilaterally symmetrically to each other, and are configured such that the inner portions (the sides facing the optical axis JD) have substantially semicircular shapes. Each of the lower leaf springs 26A and 26B includes an inner portion 26i serving as a movable side support portion fixed to the lens holding member 2, an outer portion 26e serving as a fixed side support portion fixed to the fixed-side member RG (base member 18), and 2 elastic arm portions 26g located between the inner portion 26i and the outer portion 26 e.

As shown in fig. 10B, the inner portions 26i of the lower leaf springs 26A and 26B include 2 inner engaging portions 26c that engage with the lens holding member 2 and a connecting plate portion 26h that faces the extending portion 33 of the coil 3.

When the lower plate spring 26A and the lower plate spring 26B are attached to the lens holding member 2, each protruding portion 2p of the 8 protruding portions 2p of the lens holding member 2 shown in fig. 6A is inserted into and fitted into a circular hole 26k as a penetrating portion provided at each inner joining portion 26c of the lower plate spring 26A and the lower plate spring 26B shown in fig. 10B. The through-hole may be a notch. 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 riveting or cold riveting the protruding portions 2p of the lens holding member 2.

As shown in fig. 12A and 12B, the connecting plate portion 26h constituting the inner portion 26i of the lower leaf spring 26A faces the surface of the lens holding member 2 on the image pickup device side (Z2 side) when the lower leaf spring 26A is attached to the lens holding member 2. That is, the surface of the link plate portion 26h on the object side (Z1 side) faces the surface of the flange portion 52 constituting the lens holding member 2 on the image pickup device side (Z2 side). As shown in fig. 12B, the facing portion 33c of the extending portion 33A of the coil 3 extends through a space between the surface of the inner portion 26i of the lower plate spring 26A on the subject side (Z1 side) and the surface of the flange portion 52 of the lens holding member 2 on the image pickup device side (Z2 side).

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

The lower plate spring 26A and the extension 33A of the coil 3 are electrically and mechanically connected by the solder SD. Specifically, as shown in fig. 9A, the lower plate spring 26A is attached to the lens holding member 2 such that a circular hole 26k formed in the inner joint portion 26c is fitted in the protruding portion 2p of the lens holding member 2. The protruding portion 2p of the lens holding member 2 is heat-staked, and the solder paste applied to the connecting plate portion 26h is heated by a laser. However, the lower plate spring 26A and the extension 33A of the coil 3 may be electrically and mechanically connected to each other by a conductive adhesive in which a conductive filler such as silver particles is dispersed in a synthetic resin.

The above description with reference to fig. 12A and 12B is also applicable to the connection of the lower leaf spring 26B, the lens holding member 2, and the coil 3.

As shown in fig. 10B, the outer side portion 26e of the lower leaf spring 26A includes 2 outer side engaging portions 26d (the 1 st outer side engaging portion 26d1 and the 4 th outer side engaging portion 26d4) that engage with the base member 18. Likewise, the outer side portion 26e of the lower plate spring 26B includes 2 outer side engaging portions 26d (the 2 nd outer side engaging portion 26d2 and the 3 rd outer side engaging portion 26d3) that engage with the base member 18.

As shown in fig. 13A to 13C, the 1 st outer engaging portion 26d1 of the lower plate spring 26A includes a 1 st terminal portion TN1 as a terminal portion TN extending downward (Z2 direction) from the 1 st outer engaging portion 26d1, and the 2 nd outer engaging portion 26d2 of the lower plate spring 26B includes a 2 nd terminal portion TN2 as a terminal portion TN extending downward (Z2 direction) from the 2 nd outer engaging portion 26d 2.

The 1 st terminal portion TN1 is bent in an L shape at the bent portion FD (the 1 st bent portion FD1) and protrudes downward (in the Z2 direction) from the 1 st outer joint portion 26d 1. Similarly, the 2 nd terminal portion TN2 is bent in an L shape at the bent portion FD (the 2 nd bent portion FD2) and protrudes downward (in the Z2 direction) from the 2 nd outer joint portion 26d 2.

The 1 st terminal portion TN1 is inserted into a hole 18h (1 st hole 18h1) provided in the base member 18, and the 2 nd terminal portion TN2 is inserted into a hole 18h (2 nd hole 18h2) provided in the base member 18. The front end portions of the 1 st terminal portion TN1 and the 2 nd terminal portion TN2 protrude downward (in the Z2 direction) of the base member 18 and are exposed. Therefore, the 2 tip portions constitute connection portions with the outside, respectively. In the present embodiment, each of the 2 distal end portions is configured such that the plate surface thereof faces the front (Y2 side).

The base member 18 is manufactured by injection molding a synthetic resin such as a liquid crystal polymer, for example. In the present embodiment, the base member 18 has a rectangular plate-like outer shape and a circular opening 18k at the center, as shown in fig. 13B.

The outer engagement portion 26d is placed on a placement portion 18s provided in the base member 18. Specifically, the mounting portion 18s includes the 1 st mounting portion 18s1 to the 4 th mounting portion 18s4 provided at each corner CN of the 4 corners CN (the 1 st corner CN1 to the 4 th corner CN4) of the base member 18. The 1 st outer engaging portion 26d1 is placed on the 1 st placement portion 18s1, the 2 nd outer engaging portion 26d2 is placed on the 2 nd placement portion 18s2, the 3 rd outer engaging portion 26d3 is placed on the 3 rd placement portion 18s3, and the 4 th outer engaging portion 26d4 is placed on the 4 th placement portion 18s 4.

The outer portion 26e is provided with a through hole 26t as a through portion, and the through hole 26t is fitted into a projection 18t (see fig. 13B) provided on a surface (upper surface) of the base member 18 on the subject side (Z1 side). The projection 18t is configured to project upward (in the Z1 direction). In the present embodiment, the through hole 26t is a circular hole, but may be a notch. An adhesive is applied to the portion where the through-hole 26t and the protrusion 18t are fitted. Thereby, the outer portion 26e of the lower leaf spring 26A is positioned and fixed to the base member 18.

Specifically, the through holes 26t include the 1 st through hole 26t1 to the 6 th through hole 26t6, and the protrusions 18t include the 1 st through 18t1 to the 6 th protrusion 18t 6. In the present embodiment, 1 through hole 26t (1 st through hole 26t1) is formed in the 1 st outer bonding portion 26d1 having the 1 st terminal portion TN1, and 1 through hole 26t (2 nd through hole 26t2) is also formed in the 2 nd outer bonding portion 26d2 having the 2 nd terminal portion TN 2. On the other hand, 2 through holes 26t (3 rd through hole 26t3 and 4 th through hole 26t4) are formed in the 3 rd outer bonding portion 26d3 having no terminal portion, and 2 through holes 26t (5 th through hole 26t5 and 6 th through hole 26t6) are also formed in the 4 th outer bonding portion 26d4 having no terminal portion. This is to prevent the lower leaf spring 26 from sliding on the base member 18 when the lower leaf spring 26 is attached to the base member 18. However, 2 or more through holes 26t may be formed in the 1 st outer bonding portion 26d1, or 2 or more through holes 26t may be formed in the 2 nd outer bonding portion 26d 2. Alternatively, only 1 through-hole 26t may be formed in the 3 rd outer bonding portion 26d3, and only 1 through-hole 26t may be formed in the 4 th outer bonding portion 26d 4.

With this configuration, the 1 st through hole 26t1 formed in the 1 st outer joint portion 26d1 is fitted into the 1 st projection 18t1 formed in the 1 st mounting portion 18s1, and the 2 nd through hole 26t2 formed in the 2 nd outer joint portion 26d2 is fitted into the 2 nd projection 18t2 formed in the 2 nd mounting portion 18s 2. Further, the 3 rd through hole 26t3 formed in the 3 rd outer joint portion 26d3 is fitted with the 3 rd protrusion 18t3 formed in the 3 rd mounting portion 18s3, and the 4 th through hole 26t4 formed in the 3 rd outer joint portion 26d3 is fitted with the 4 th protrusion 18t4 formed in the 3 rd mounting portion 18s 3. Similarly, the 5 th through hole 26t5 formed in the 4 th outer joint portion 26d4 is fitted into the 5 th protrusion 18t5 formed in the 4 th mounting portion 18s4, and the 6 th through hole 26t6 formed in the 4 th outer joint portion 26d4 is fitted into the 6 th protrusion 18t6 formed in the 4 th mounting portion 18s 4. An adhesive is applied to the portion where the through-hole 26t and the protrusion 18t are fitted. Thereby, the outer portion 26e of the lower leaf spring 26A is positioned and fixed to the base member 18.

In this way, the lower plate spring 26A is engaged with the lens holding member 2 by 2 inner engaging portions 26c, and is connected with the base member 18 by 2 outer engaging portions 26 d. The same applies to the lower leaf spring 26B. With this configuration, the lower plate springs 26A and 26B can suspend and support the lens holding member 2 in a balanced manner in a state in which the lens holding member can move in the optical axis direction.

The lower plate spring 26A and the lower plate spring 26B, which are electrically insulated from each other, are electrically connected to a substrate (not shown) on which the image pickup device is mounted. The lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. Therefore, the coil 3 can receive the supply of current through the lower plate spring 26.

Next, the connection of the lower leaf spring 26 to the lens holding member 2 and the base member 18 will be described with reference to fig. 14A and 14B. Fig. 14A and 14B are perspective views of the lower leaf spring 26 connecting the lens holding member 2 and the base member 18. Specifically, fig. 14A is an upper perspective view of the lower leaf spring 26 in a state where the lower leaf spring 26A and the lower leaf spring 26B are connected by the connection portion JC. Fig. 14B is a lower perspective view of the lower plate spring 26 to which the lens holding member 2 is attached. Fig. 14C is an upper perspective view of the lower leaf spring 26 to which the base member 18 is further attached.

Before the lens holding member 2 and the base member 18 are attached to the lower leaf spring 26, the lower leaf spring 26 is in a state in which the lower leaf spring 26A and the lower leaf spring 26B are connected by the connection portion JC, as shown in fig. 14A. That is, the lower plate spring 26 is formed into a shape as shown in fig. 14A from 1 metal plate by etching or the like. The lower leaf spring 26 is attached to the lens holding member 2 and the base member 18, and then is disconnected from the connection portion JC at the cutting portion CT (see fig. 13A).

In the present embodiment, the connection portion JC includes 1 st connection portion JC1 to 4 th connection portion JC4 as shown in fig. 14A, and the cutting portion CT includes 1 st cutting portion CT1 to 8 th cutting portion CT8 as shown in fig. 13A. The circular hole formed in each connection portion JC is used for positioning the lower plate spring 26 when the lower plate spring 26 is attached to each of the lens holding member 2 and the base member 18.

Specifically, the 1 st connecting portion JC1 is configured to connect the 1 st outer joint part 26d1 and the 2 nd outer joint part 26d 2. The 2 nd connecting portion JC2 is configured to connect the 2 nd outer joint part 26d2 and the 3 rd outer joint part 26d 3. The 3 rd connecting portion JC3 is configured to connect the 3 rd outer joint part 26d3 and the 4 th outer joint part 26d 4. The 4 th connecting portion JC4 is configured to connect the 4 th outer joint part 26d4 and the 1 st outer joint part 26d 1.

Also, the 1 st outer joint part 26d1 is broken from the 1 st joint JC1 at the 1 st cut part CT1, and is broken from the 4 th joint JC4 at the 8 th cut part CT 8. The 2 nd outer joint portion 26d2 is configured to be broken from the 1 st joint JC1 at the 2 nd cut part CT2 and from the 2 nd joint JC2 at the 3 rd cut part CT 3. The 3 rd outer joint portion 26d3 is configured to be disconnected from the 2 nd connecting portion JC2 at the 4 th cut portion CT4 and from the 3 rd connecting portion JC3 at the 5 th cut portion CT 5. The 4 th outer joint portion 26d4 is configured to be disconnected from the 3 rd connecting portion JC3 at the 6 th cut portion CT6 and from the 4 th connecting portion JC4 at the 7 th cut portion CT 7.

In the present embodiment, the 1 st to 4 th connecting portions JC1 to JC4 are configured to be disconnected independently of each other, but may be configured to be formed integrally with at least 2 members.

As shown in fig. 14B, in the lower leaf spring 26 in a state where the lower leaf spring 26A and the lower leaf spring 26B are coupled by the coupling portion JC, the inner joining portion 26c is attached to the lens holding member 2 before the outer joining portion 26d is attached to the base member 18.

Specifically, the lower plate spring 26 is inserted into the circular hole 26k formed in the inner joint portion 26c through the projection portion 2p of the lens holding member 2, and then the projection portion 2p is heat-staked to be joined to the lens holding member 2. The lower plate spring 26 is electrically and mechanically connected to the extending portion 33 wound around the holding portion 72 of the lens holding member 2 by the solder SD at the connecting plate portion 26 h.

Then, the lower plate spring 26 in the state of being engaged with the lens holding member 2 is attached to the base member 18 via the outer engaging portion 26d as shown in fig. 14C.

Specifically, the lower leaf spring 26 is formed by inserting the protrusion 18t of the base member 18 into the through hole 26t formed in the outer joining portion 26d and inserting the terminal portion TN extending from the outer joining portion 26d into the hole 18h (see fig. 13B) formed in the base member 18, and then applying an adhesive (not shown) to attach the lower leaf spring 26 to the protrusion 18t and the hole 18h, thereby adhesively fixing the lower leaf spring 26 to the base member 18.

In the present embodiment, the adhesive is a hybrid adhesive that is cured by heat or ultraviolet rays, or cured by moisture or ultraviolet rays. The lower leaf spring 26 is half-cured (provisionally cured) by irradiation of ultraviolet rays, and then is disconnected from the connection portion JC at the cutting portion CT. After the lower leaf spring 26 is disconnected from the connection portion JC, the adhesive is completely cured by heat or moisture. However, the lower leaf spring 26 may be disconnected from the connection portion JC at the cut portion CT after the adhesive is completely cured. In this case, the adhesive may be an ultraviolet-curable adhesive or a heat-curable adhesive.

Next, the structure of the 1 st corner CN1, which is 1 of the 4 corners CN of the base member 18, will be described with reference to fig. 15A to 15D and fig. 16A to 16C. Fig. 15A to 15D are enlarged views of the 1 st corner CN1 of the base member 18, and correspond to enlarged views of a part ZN1 surrounded by a broken line in fig. 13B. Specifically, fig. 15A to 15C are top perspective views of the 1 st corner CN1 of the base member 18, and fig. 15D is a plan view of the 1 st corner CN1 of the base member 18. Fig. 16A to 16C are sectional views of the base member 18. Specifically, fig. 16A is a view showing a cross section of the 1 st protrusion 18t1 in a vertical plane (XZ plane) including the one-dot chain line L1 in fig. 15D. Fig. 16B is a view showing a cross section of the 1 st projection 18t1a, which is a comparative example of the 1 st projection 18t 1. Fig. 16C is a cross-sectional view of the 1 st projection 18t1b, which is another comparative example of the 1 st projection 18t 1. The description of the 1 st corner CN1 also applies to the 2 nd corner CN 2.

The 1 st corner CN1 of the base member 18 mainly includes the 1 st mounting portion 18s1, the 1 st protrusion 18t1, the 1 st hole 18h1, the wall portion WL, and the outer edge portion EG. The 1 st mounting portion 18s1 is configured to mount the 1 st outer engagement portion 26d1 of the lower leaf spring 26A. The 1 st projection 18t1 is configured to be inserted through the 1 st through hole 26t1 formed in the 1 st outer engaging portion 26d1 of the lower leaf spring 26A.

Specifically, as shown in fig. 16A, the 1 st projection 18t1 includes a root RT constituting a base of the 1 st projection 18t 1. In the present embodiment, the root RT is formed at a position lower than the upper surface (surface on the Z1 side) of the 1 st mounting portion 18s 1.

Further, a groove portion GR is formed around the root RT of the 1 st projection 18t1 so as to be recessed from the upper surface of the 1 st mounting portion 18s 1. In the present embodiment, the groove GR is formed annularly over the entire circumference of the root RT. With this configuration, when the adhesive is applied to the upper surface of the 1 st outer joint portion 26d1 after the 1 st terminal portion TN1 is inserted into the 1 st hole portion 18h1, the adhesive passes around the root RT of the 1 st protrusion 18t1 and can easily adhere to the lower surface of the 1 st outer joint portion 26d1 above the groove portion GR. However, the groove GR may be formed in a partial ring shape.

As shown in the comparative example of fig. 16B, when the groove portion GR is omitted and the root RT is formed at a position higher than the upper surface of the 1 st mounting portion 18s1, the lower leaf spring 26A may be adhered and fixed to the base member 18 in a state of being caught on the root RT of the 1 st projection 18t1a and being lifted up in the height direction (Z1 direction). The 1 st projection 18t1 of the present embodiment can prevent such lifting of the lower leaf spring 26A by forming the groove portion GR, and can suppress variation in the operating characteristics of the lens drive device 101.

The root RT is formed as a curved surface to ensure or improve the mechanical strength of the 1 st projection 18t 1. That is, the root RT is configured to be smoothly connected to the groove GR by the curved surface processing.

As shown in the other comparative example of fig. 16C, when the root RT is formed in a cylindrical shape, the 1 st projection 18t1b may be reduced in mechanical strength because stress concentrates on the lower end portion of the root RT indicated by the arrow AR 1. The 1 st projection 18t1 of the present embodiment can prevent such a decrease in mechanical strength by configuring the root RT to be a curved surface.

The 1 st hole 18h1 is configured to allow the 1 st terminal TN1 to pass therethrough. In the present embodiment, as shown in fig. 15D, the 1 st hole 18h1 is formed in the 1 st placement portion 18s1 so as to extend along the X axis. The 1 st hole 18h1 includes 3 inclined surfaces SL (1 st inclined surface SL1 to 3 rd inclined surface SL3) and the recess CV. In this configuration, when the adhesive is applied to the upper surface of the 1 st outer bonding portion 26d1 after the 1 st terminal portion TN1 is inserted into the 1 st hole portion 18h1, the adhesive can be easily attached to the lower surface of the 1 st outer bonding portion 26d1 and the periphery of the 1 st terminal portion TN 1.

The wall portion WL is configured to prevent the adhesive applied on the 1 st outer joining portion 26d1 placed on the 1 st placement portion 18s1 from flowing out to the outside of the 1 st placement portion 18s 1. In the present embodiment, the wall portion WL includes a 1 st wall portion WL1 extending in the X axis direction, a 2 nd wall portion WL2 extending in the Y axis direction, and a 3 rd wall portion WL3 facing the corner of the base member 18 and extending so as to connect the 1 st wall portion WL1 and the 2 nd wall portion WL 2.

As shown in fig. 16A, the upper end of the wall portion WL is located at a position higher by a height H1 than the upper surface of the 1 st mounting portion 18s1, and is at the same height as the upper surface TS of the 1 st projection 18t 1. However, the height of the wall portion WL may be different from the height of the upper surface TS of the 1 st projection 18t 1.

With this structure, the wall portion WL can prevent the adhesive applied on the 1 st outer joint portion 26d1 from flowing out onto the outer edge portion EG and being cured. Therefore, the wall portion WL can prevent the adhesive that has hardened above the outer edge portion EG from interfering with the lower end portion of the outer wall portion 4A of the yoke 4 when the yoke 4 is attached to the base member 18 in the subsequent step.

The outer edge portion EG is a portion constituting a base portion of the base member 18. As shown in fig. 2A, the upper surface of the outer edge portion EG is configured to contact the lower end portion of the outer wall portion 4A of the yoke 4.

Next, the joining of the lower leaf spring 26A and the base member 18 by the adhesive AD will be described with reference to fig. 17A to 19B. Fig. 17A and 17B are enlarged views of the 1 st corner CN1 of the base member 18. Specifically, fig. 17A is a plan view of the 1 st corner CN1 in a state where the 1 st outer engaging portion 26d1 of the lower leaf spring 26A is placed on the 1 st placing portion 18s 1. Fig. 17B is a plan view of the 1 st corner CN1 in a state where the adhesive AD is applied to the 1 st outer joint part 26d 1. Fig. 18 is an enlarged view of the 1 st through hole 26t1 formed in the 1 st outer joint portion 26d1, and corresponds to an enlarged view of a part ZN2 surrounded by a broken line in fig. 17A. Fig. 19A and 19B are sectional views of corner 1 CN 1. Specifically, fig. 19A is a view showing a cross section of the 1 st corner CN1 in a vertical plane (XZ plane) including the one-dot chain line L2 in fig. 17B. Fig. 19B is a view showing a cross section of the 1 st corner CN1 in a vertical plane (YZ plane) including the one-dot chain line L3 in fig. 17B.

In the present embodiment, the 1 st through hole 26t1 is a substantially circular hole having a radius R2 larger than the radius R1 of the 1 st projection 18t1 as shown in fig. 18, and 4 substantially semicircular notches CU (the 1 st notch CU1 to the 4 th notch CU4) are arranged at equal intervals on the circumference. The notch CU is formed to facilitate the inflow of the adhesive AD into the groove portion GR. However, the notch CU may also be omitted.

As shown in fig. 19A, the adhesive AD applied to the 1 st outer joint portion 26d1 flows into the groove portion GR through the gap between the 1 st protrusion 18t1 and the 1 st through hole 26t 1. Also, the adhesive AD adheres to and hardens the lower surface of the 1 st outer joint portion 26d1, the inner circumferential surface of the 1 st through hole 26t1, the outer circumferential surface of the 1 st protrusion 18t1, and the upper surface of the 1 st outer joint portion 26d 1.

In this way, the adhesive AD in the groove GR and the adhesive AD on the upper surface of the 1 st outer bonding portion 26d1 are connected and cured in the base member 18 and the lower leaf spring 26A, and the 1 st outer bonding portion 26d1 is located outside the 1 st through hole 26t 1.

In the present embodiment, the adhesive AD is applied so as to completely cover the upper surface TS of the 1 st projection 18t1, but may be applied so as not to cover the upper surface TS of the 1 st projection 18t1, that is, so as to expose at least a part of the upper surface TS of the 1 st projection 18t 1.

Further, as shown in fig. 19B, the adhesive AD applied to the 1 st outer joint portion 26d1 flows into the space between the 1 st terminal portion TN1 and the 1 st hole portion 18h 1. The adhesive AD adheres to and hardens the lower surfaces of the 1 st inclined surface SL1, the 2 nd inclined surface SL2, the 3 rd inclined surface SL3, the recess CV, the 1 st terminal portion TN1, the 1 st outer joint portion 26d1, and the upper surface of the 1 st outer joint portion 26d1, and the 1 st inclined surface SL1, the 2 nd inclined surface SL2, the 3 rd inclined surface SL3, and the recess CV constitute the 1 st hole 18h 1.

In this way, the base member 18 and the lower leaf spring 26A are configured such that the adhesive AD between the 1 st terminal portion TN1 and the 1 st hole portion 18h1, the adhesive AD attached to the lower surface of the 1 st outer bonding portion 26d1, and the adhesive AD attached to the upper surface of the 1 st outer bonding portion 26d1 are connected and cured.

In other embodiments, the base member 18 may have a groove portion GR1 different from the groove portion GR at a position indicated by a one-dot chain line in fig. 17A, for example. The groove portion GR1 is formed, for example, inside the wall portion WL, partially below the 1 st outer joint portion 26d 1. With this structure, when the adhesive AD is applied to the upper surface of the 1 st outer joint portion 26d1, the adhesive AD flows into the groove portion GR1 through the gap between the 1 st outer joint portion 26d1 and the wall portion WL, and easily adheres to the lower surface of the 1 st outer joint portion 26d1 above the groove portion GR 1. With this structure, the adhesive AD is cured by sandwiching the 1 st outer joint portion 26d1 between the groove portion GR1 and the upper and lower sides thereof. Therefore, this structure can further improve the adhesion strength between the lower leaf spring 26A and the base member 18.

As described above, the lens driving device 101 of the present embodiment includes a housing including the base member 18 and the yoke 4 as a cover member, the lens holding member 2 capable of holding the lens body, the coil 3 held by the lens holding member 2, the magnet 5 opposed to the coil 3, and the leaf spring 6 (lower leaf spring 26) provided to movably support the lens holding member 2 in the optical axis direction and to connect the base member 18 and the lens holding member 2.

The lower plate spring 26 has an outer portion 26e as a fixed side support portion fixed to the base member 18, an inner portion 26i as a movable side support portion fixed to the lens holding member 2, an elastic arm portion 26g provided between the outer portion 26e and the inner portion 26i, and a terminal portion TN extending from the outer portion 26e and exposed to the outside of the base member 18.

The base member 18 includes a hole 18h through which the terminal portion TN is inserted, a mounting portion 18s on which the outer portion 26e of the lower leaf spring 26 is mounted, a protrusion 18t inserted into a through hole 26t formed in the outer portion 26e as a through portion, and a groove portion GR formed around the protrusion 18t so as to be recessed from the mounting portion 18 s.

The lens driving device 101 is configured such that the adhesive AD is disposed between the terminal portion TN and the hole portion 18h, and the adhesive AD in the groove portion GR is connected to the adhesive AD on the upper surface of the outer portion 26e located outside the through hole 26 t.

With this configuration, the lens driving device 101 does not need to have the terminal portion as a separate component, so that the number of components can be reduced, and the manufacturing cost of the connection structure between the lower plate spring 26 and the power supply located outside the lens driving device 101 can be suppressed.

The lower plate spring 26 having the terminal portion TN is formed by etching, and thus, the change of the terminal length, the pitch, and the like can be relatively easily allowed.

In the lens driving device 101, the adhesive AD attached to the projection 18t is cured while spreading to both the upper and lower sides of the outer portion 26e (outer joint portion 26d) of the lower leaf spring 26, and the lower leaf spring 26 can be firmly fixed to the base member 18.

Further, in lens drive device 101, adhesive AD is configured to flow into a space between terminal portion TN and hole 18h, and thus foreign matter can be reliably prevented from entering from the outside through hole 18 h.

The groove portion GR is preferably formed annularly around the root RT of the projection 18 t. Even if the diameter of the root RT of the projection 18t is increased so as to increase the end thereof in order to secure the mechanical strength, the groove portion GR can prevent the lower leaf spring 26 from interfering with the root RT of the projection 18t as shown in fig. 16B. Therefore, the groove GR can prevent the lower leaf spring 26 from being attached to the base member 18 in a state of being lifted from the base member 18.

In the lens driving device 101, a part of the fixing side support portion of the lower plate spring 26 is preferably positioned above the groove portion GR, and an adhesive is preferably attached to the lower surface of the fixing side support portion. Specifically, as shown in fig. 19A, the lens driving device 101 is configured such that the edge of the 1 st through hole 26t1 formed in the 1 st outer joint portion 26d1 protrudes above the groove GR, and the adhesive AD adheres to the lower surface of the edge. With this configuration, in the lens driving device 101, the adhesive AD attached to the 1 st projection 18t1 is cured in a state of sandwiching the outer portion 26e (the 1 st outer joining portion 26d1) of the lower leaf spring 26A up and down, and the lower leaf spring 26A can be firmly fixed to the base member 18.

The base member 18 is preferably configured to be rectangular in plan view, and the placement portions 18s are located at the corners CN of the base member 18. The terminal portion TN is preferably bent in an L shape from the outer portion 26e and protrudes downward. The hole 18h is preferably formed along the outer edge EG of the base member 18. Further, a wall portion WL higher than the placement portion 18s is preferably formed outside the hole portion 18 h. The wall portion WL can suppress the outflow of the adhesive AD to the outside. Therefore, as shown in fig. 2A, the wall portion WL can prevent the adhesive AD from interfering with the fitting between the upper surface of the outer edge portion EG of the base member 18 and the lower end surface of the outer wall portion 4A of the yoke 4.

The wall portion WL preferably includes, as shown in fig. 15A, a 1 st wall portion WL1 extending in the 1 st direction (X-axis direction), a 2 nd wall portion WL2 extending in the 2 nd direction (Y-axis direction) intersecting the 1 st direction (X-axis direction), and a 3 rd wall portion WL3 connecting the 1 st wall portion WL1 and the 2 nd wall portion WL 2. The hole 18h (the 1 st hole 18h1) is provided in the mounting portion 18s (the 1 st mounting portion 18s1) along the 1 st wall portion WL 1. With this structure, the wall portion WL can more effectively suppress the outflow of the adhesive AD to the outside.

The lower leaf spring 26 preferably includes a lower leaf spring 26A as a 1 st leaf spring and a lower leaf spring 26B as a 2 nd leaf spring, as shown in fig. 13A. The lower leaf spring 26A and the lower leaf spring 26B are coupled to each other via a coupling portion JC until they are mounted on the base member 18 as shown in fig. 14A. Further, as shown in fig. 13B, the hole 18h preferably includes a 1 st hole 18h1 and a 2 nd hole 18h 2. In this case, the lower plate spring 26A has a plate-shaped 1 st terminal portion TN1, and the lower plate spring 26B has a plate-shaped 2 nd terminal portion TN 2. Further, 1 st terminal portion TN1 is inserted into 1 st hole portion 18h1, and 2 nd terminal portion TN2 is inserted into 2 nd hole portion 18h 2. The plate surface of the 1 st terminal portion TN1 and the plate surface of the 2 nd terminal portion TN2 are arranged to face the same direction (Y2 direction). The lower leaf spring 26A is configured such that the 1 st cut portion CT1 at a position adjacent to the 1 st bent portion FD1 of the 1 st terminal portion TN1 is cut off from the 1 st connecting portion JC1 (see fig. 14A). The lower leaf spring 26B is configured such that the 2 nd cut portion CT2 at a position adjacent to the 2 nd bent portion FD2 of the 2 nd terminal portion TN2 is cut off from the 1 st connecting portion JC 1. With this configuration, the lower leaf spring 26A and the lower leaf spring 26B are attached to the lens holding member 2 and the base member 18 in a state of being coupled by the coupling portion JC as shown in fig. 14A. Therefore, this structure can improve the assembling property of the lens driving device 101.

For example, as shown in fig. 13A, the lower plate spring 26A may have a 1 st outer engaging portion 26d1 and a 4 th outer engaging portion 26d4, and the lower plate spring 26B may have a 2 nd outer engaging portion 26d2 and a 3 rd outer engaging portion 26d 3. In this case, the 1 st outside bonding portion 26d1 includes a 1 st terminal portion TN1, and the 2 nd outside bonding portion 26d2 includes a 2 nd terminal portion TN 2.

Further, the 1 st outer joint portion 26d1 is configured to be disconnected from a 1 st connecting portion JC1 that connects the 1 st outer joint portion 26d1 and the 2 nd outer joint portion 26d2 and to be disconnected from a 4 th connecting portion JC4 that connects the 4 th outer joint portion 26d4 and the 1 st outer joint portion 26d1, as shown in fig. 14A. The 2 nd outer joint portion 26d2 is configured to be disconnected from the 1 st joint JC1, and to be disconnected from the 2 nd joint JC2 that connects the 2 nd outer joint portion 26d2 and the 3 rd outer joint portion 26d 3. The 3 rd outer joint portion 26d3 is configured to be disconnected from the 2 nd connecting portion JC2, and to be disconnected from the 3 rd connecting portion JC3 that connects the 3 rd outer joint portion 26d3 and the 4 th outer joint portion 26d 4. The 4 th outer joint part 26d4 is configured to be disconnected from the 3 rd connecting portion JC3 and from the 1 st connecting portion JC 1. With this configuration, the lower leaf springs 26A and 26B are easily disconnected from each other after the lower leaf springs 26 are attached to the lens holding member 2 and the base member 18.

As shown in fig. 13A to 13C, for example, the method for manufacturing the lens driving device 101 according to the embodiment of the present invention includes: a mounting step of inserting the terminal portion TN into a hole portion 18h formed in the base member 18 to expose a part of the terminal portion TN to the outside of the base member 18, and mounting the outer joint portion 26d on a mounting portion 18s of the base member 18 by inserting the protrusion 18t formed in the base member 18 into a through hole 26t serving as a through portion formed in the outer joint portion 26d serving as a fixed-side support portion; a coating step of coating an adhesive so as to adhere to the terminal portion TN and the protrusion 18 t; and a curing step of curing the adhesive that has entered between the terminal portion TN and the hole portion 18h and spread such that an adhesive portion of the groove portion GR formed around the root portion RT of the protrusion 18t at the placement portion 18s is continuous with an adhesive portion of the upper surface of the outer joining portion 26d located outside the through hole 26 t. The adhesive is preferably hardened by ultraviolet irradiation.

This manufacturing method is used for the lens driving device 101 using the lower plate spring 26 having the terminal portion TN integrated therein. Therefore, this manufacturing method can omit a step of mounting the terminal portion as a separate member to the base member 18 and a step of connecting the lower leaf spring 26 to the terminal portion as a separate member.

In addition, in this manufacturing method, the adhesive applied in the 1-time application step adheres to the terminal portion TN of the lower leaf spring 26 and the protrusion 18t of the base member 18, so that the production efficiency of the lens driving device 101 can be improved. This is because it is not necessary to apply an adhesive to the terminal portion TN and to apply an adhesive to the protrusion 18t separately.

Further, in this manufacturing method, the adhesive portion at the groove portion GR and the adhesive portion at the upper surface of the outer joining portion 26d are integrally cured, and the adhesive strength between the base member 18 and the lower leaf spring 26 can be improved.

In this manufacturing method, as shown in fig. 19A, for example, the adhesive flows into the groove portion GR so as to adhere to the lower surface of the outer joining portion 26d of the lower leaf spring 26 protruding above the groove portion GR. Therefore, the adhesive agent sandwiches and hardens a part of the outer joining portion 26 d. As a result, this manufacturing method can further improve the adhesion strength between the base member 18 and the lower leaf spring 26.

In this manufacturing method, the lower leaf spring 26A and the lower leaf spring 26B are preferably disconnected from the connection portion JC after the curing step. That is, the lower plate spring 26A and the lower plate spring 26B are connected by the connection portion JC before the curing process is completed. Therefore, according to this manufacturing method, handling of the lower leaf springs 26A and 26B is facilitated. Further, according to this manufacturing method, before the lower leaf spring 26A and the lower leaf spring 26B are disconnected from the connection portion JC, excessive deformation of the lower leaf spring 26A and the lower leaf spring 26B is suppressed by the connection portion JC. Therefore, according to this manufacturing method, plastic deformation of the elastic arm portion 26g of the lower leaf spring 26 during assembly of the lens driving device 101 is reliably prevented.

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 applied to various modifications and alterations without departing from the scope of the present invention. The features described with reference to the above embodiments may be combined as appropriate as long as they are not technically contradictory.

Description of the marks

A leaf spring holding member 1 c. corner 1 p. projection 1 r. recess 2. lens holding member 2 p. yoke 4A. outer wall 4B. upper wall 4F. inner wall 4 k. circular hole 4 s. receptacle 5. magnet 6. coil winding 16 h. inner wall 12 h. spring support section 16 h. inner wall section 18 h. inner wall section 16. coil winding 16 h. inner wall section 18 h. spring holding member 18 h. inner wall section 18 h. spring holding section 18 h. inner wall section 18 h. spring holding section 18 h. inner wall section, 26B. a lower plate spring 26 c. an inner joint portion 26 d. an outer joint portion 26 e. an elastic arm portion 26 h. a connection plate portion 26 i. an inner portion 26 k. a circular hole 26 t. a through hole 33, 33A, 33B. extension 33 c. facing portion 33 k. insertion portion 33 m. winding portion 52 k. flange portion 52 k. notch portion 72, 72A, 72B. holding part 101. lens driving device AD. adhesive CN. corner CT. cutting part CU. notch CV. recess EG. outer edge FD. bending part GR. groove JC. connection JD. optical axis MK. fixed-side part RT. root SD. solder SL. inclined surface TS. wall.

Claims (10)

1. A lens driving device is provided with:

a housing including a base member and a cover member;

a lens holding member capable of holding a lens body;

a coil held by the lens holding member;

a magnet facing the coil; and

a leaf spring configured to support the lens holding member movably in an optical axis direction and to connect the base member and the lens holding member,

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

the leaf spring has a fixed-side support portion fixed to the base member, a movable-side support portion fixed to the lens holding member, an elastic arm portion provided between the fixed-side support portion and the movable-side support portion, and a terminal portion extending from the fixed-side support portion and exposed to the outside of the base member,

the base member has a hole portion through which the terminal portion is inserted, a mounting portion on which the fixed-side support portion is mounted, a protrusion inserted into a through portion formed in the fixed-side support portion, and a groove portion formed around the protrusion and recessed from the mounting portion,

an adhesive is disposed between the terminal portion and the hole portion, the adhesive in the groove portion is connected to the adhesive on the upper surface of the fixed-side support portion, and the fixed-side support portion is located outside the through portion.

2. The lens driving apparatus as claimed in claim 1,

the groove portion is formed in a ring shape around a root portion of the protrusion.

3. The lens driving apparatus as claimed in claim 1,

a part of the fixed-side support portion is positioned above the groove portion, and an adhesive is attached to a lower surface of the fixed-side support portion.

4. The lens driving apparatus according to claim 2,

a part of the fixed-side support portion is positioned above the groove portion, and an adhesive is attached to a lower surface of the fixed-side support portion.

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

the base member is configured to be rectangular in a plan view, and the placement portion is located at a corner of the base member,

the terminal portion is bent in an L shape from the fixed-side supporting portion and protrudes downward,

the hole is formed along the outer edge of the base member,

a wall portion higher than the placement portion is formed outside the hole portion.

6. The lens driving apparatus as claimed in claim 5,

the wall parts include a 1 st wall part extending along a 1 st direction, a 2 nd wall part extending along a 2 nd direction intersecting the 1 st direction, and a 3 rd wall part connecting the 1 st wall part and the 2 nd wall part,

the hole is provided along the first wall 1 at the placement portion.

7. The lens driving apparatus as claimed in claim 5,

the leaf springs include a 1 st leaf spring and a 2 nd leaf spring,

the holes include a 1 st hole and a 2 nd hole,

the 1 st plate spring has a plate-shaped 1 st terminal portion,

the 2 nd plate spring has a plate-shaped 2 nd terminal portion,

the 1 st terminal part is inserted into the 1 st hole part,

the 2 nd terminal part is inserted into the 2 nd hole part,

the plate surface of the 1 st terminal portion and the plate surface of the 2 nd terminal portion are arranged in the same direction,

the 1 st leaf spring is configured to be separated from a connection portion at a 1 st cut portion, the 1 st cut portion is located adjacent to a bent portion of the 1 st terminal portion, the connection portion connects the 1 st leaf spring and the 2 nd leaf spring, and,

the 2 nd leaf spring is configured to be separated from the connection portion at a 2 nd cut portion, and the 2 nd cut portion is located adjacent to a bent portion of the 2 nd terminal portion.

8. The lens driving apparatus as claimed in claim 6,

the leaf springs include a 1 st leaf spring and a 2 nd leaf spring,

the holes include a 1 st hole and a 2 nd hole,

the 1 st plate spring has a plate-shaped 1 st terminal portion,

the 2 nd plate spring has a plate-shaped 2 nd terminal portion,

the 1 st terminal part is inserted into the 1 st hole part,

the 2 nd terminal part is inserted into the 2 nd hole part,

the plate surface of the 1 st terminal portion and the plate surface of the 2 nd terminal portion are arranged in the same direction,

the 1 st leaf spring is configured to be separated from a connection portion at a 1 st cut portion, the 1 st cut portion is located adjacent to a bent portion of the 1 st terminal portion, the connection portion connects the 1 st leaf spring and the 2 nd leaf spring, and,

the 2 nd leaf spring is configured to be separated from the connection portion at a 2 nd cut portion, and the 2 nd cut portion is located adjacent to a bent portion of the 2 nd terminal portion.

9. The lens driving apparatus as claimed in claim 8,

the fixed side support portion of the 1 st leaf spring has a 1 st outer engaging portion and a 4 th outer engaging portion,

the fixed side support portion of the 2 nd plate spring has a 2 nd outer engaging portion and a 3 rd outer engaging portion,

the 1 st outer joint part has the 1 st terminal part,

the 2 nd outer joint portion has the 2 nd terminal portion,

the 1 st outer joint part is configured to be disconnected from a 1 st joint part and also disconnected from a 4 th joint part, the 1 st joint part connects the 1 st outer joint part and the 2 nd outer joint part, the 4 th joint part connects the 4 th outer joint part and the 1 st outer joint part,

the 2 nd outer joint part is configured to be disconnected from the 1 st joint part and also from the 2 nd joint part, the 2 nd joint part connects the 2 nd outer joint part and the 3 rd outer joint part,

the 3 rd outer joint part is configured to be disconnected from the 2 nd connecting part and also disconnected from the 3 rd connecting part, the 3 rd connecting part connects the 3 rd outer joint part and the 4 th outer joint part,

the 4 th outer joint part is configured to be disconnected from the 3 rd connecting part and also disconnected from the 4 th connecting part.

10. A camera module, characterized in that,

the disclosed device is provided with: the lens driving device according to any one of claims 1 to 9;

the lens body; and

and an imaging element facing the lens body.

Images