CN213338175U - Lens driving device and camera module - Google Patents

Abstract

A lens driving device and a camera module can inhibit the generation of stripping scraps of a coating layer in a lead wire forming a coil. A lens driving device (101) is provided with: a lens holding member (2); a coil (3); and an upper plate spring (16) and a lower plate spring (26) which support the lens holding member (2) so as to be movable in the optical axis direction. The coil (3) has: a winding section (13) formed of a conductive wire wound around the outer periphery of the lens holding member (2); and an extension portion (33B) extending from a winding end portion (13WE) of the winding portion (13) and connected to the lower leaf spring (26B). The wire has a Metal Wire (MW) and an insulating Coating (CL) covering the Metal Wire (MW). The extending portion (33B) extends so as to intersect with a lead portion located on the outermost periphery of the winding portion (13) with the winding end portion (13WE) as a base point.

Description

Lens driving device and camera module

Technical Field

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

Background

Conventionally, a lens driving device including a lens holding member and a coil arranged on an outer periphery of the lens holding member is known (see patent document 1). In this device, the wire constituting the coil has a conductive metal wire and an insulating coating layer covering the metal wire. The cladding layer is formed in a double-layer structure of an insulating layer covering the metal wire and a cladding layer arranged around the insulating layer. Further, the respective fusion-spliced layers of the 2 lead portions adjacent to each other when wound around the outer periphery of the lens holding member are thermally welded to each other.

The plurality of lead portions constituting the outermost layer of the coil are sequentially wound from the object side (upper side) toward the image pickup device side (lower side) in the direction along the optical axis. Further, the lowest wire portion of the plurality of wire portions is configured to be relatively easily separated from the adjacent wire portion on the upper side when pulled downward. That is, the lowermost lead portion of the plurality of lead portions constituting the outermost layer is configured not to intersect with the other lead portions constituting the outermost layer when pulled downward, but to be separated from the other lead portions. This is to prevent an excessive tension from being applied to the end portion of the wire extending from the winding end portion of the coil, that is, the extending portion.

Patent document 1: international publication No. 2018/181168

However, in the lens driving device described above, when the lead portion located on the lowermost side among the plurality of lead portions constituting the outermost layer receives an impact due to dropping or the like, the lead portion may be further peeled off from the other lead portions constituting the outermost layer, and peeling debris of the coating may be generated. Further, the peeling debris of the coating layer may adhere to the image pickup element as foreign matter, causing an image failure.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide a lens driving device capable of suppressing generation of peeling debris of a coating in a wire constituting a coil.

The lens driving device according to an embodiment of the present invention includes: a support member; a lens holding member capable of holding a lens body; a coil held by the lens holding member; a magnet opposed to the coil; and a pair of leaf springs arranged to connect the support member and the lens holding member and to support the lens holding member movably in an optical axis direction, wherein the coil includes: a winding portion formed of a conductive wire wound around an outer periphery of the lens holding member; a 1 st extending portion extending from a winding start end portion of the winding portion and connected to one of the leaf springs; and a 2 nd extending portion extending from a winding end portion of the winding portion and connected to the other leaf spring, wherein the lead wire has a metal wire and an insulating coating covering the metal wire, and the 2 nd extending portion extends from the winding end portion as a base point so as to cross a lead wire portion located at an outermost periphery of the winding portion.

The winding end portion may be provided between one end portion and the other end portion of the winding portion in the optical axis direction.

The lens holding member may have a cylindrical portion around which the lead wire is wound, and the outer periphery of the annular cross section of the cylindrical portion may have an oval shape.

The lens holding member may have a flange portion for supporting the winding portion and a pair of holding portions for holding the 1 st extending portion and the 2 nd extending portion, respectively, the cylindrical portion may have a long diameter portion having a largest diameter dimension passing through an optical axis in a plan view, and the flange portion may be provided with a notch portion for passing the 1 st extending portion and the 2 nd extending portion, respectively, in correspondence with the long diameter portion.

The camera module according to an embodiment of the present invention includes: the lens driving device described above; the lens body; and an imaging element facing the lens body.

Effect of the utility model

The lens driving device can inhibit the generation of coating peeling scraps.

Drawings

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

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

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

Fig. 4(a) and 4(B) are top perspective views of the lens driving device in a state where a part of the components is removed.

Fig. 5(a) and 5(B) are top perspective views of the lens holding member.

Fig. 6(a) and 6(B) are bottom perspective views of the lens holder.

Fig. 7(a) and 7(B) are bottom perspective views of the lens holder.

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

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

Fig. 10(a) and 10(B) are plan views of the upper leaf spring and the lower leaf spring.

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

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

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

Fig. 14(a) and 14(B) are a side view and a cross-sectional view of a lens holding member holding a coil.

Fig. 15(a) and 15(B) are sectional views of the lens holding member holding the coil.

Fig. 16 is a sectional view of a wire constituting a coil.

Fig. 17 is a diagram illustrating another example of a connection structure between a lower plate spring and a coil in the lens driving device.

Description of the reference numerals

1. a plate spring holding member; 1c · corner; 1p · protrusion; 1r · recess; 2 · lens holding member; 2 p.bulge; 2q · abutment; 3. coil; 4. yoke; 4A. outer wall portion; 4B · upper surface part; 4 k. round hole; 4s · receiving section; 5. magnet; 6. leaf spring; 7. metal parts; 7A. 1 st metal part; 7 AT. terminal portion; 7B. 2 nd metal part; 7BT · terminal section; 7C · 3 rd metal part; 7C 1-7C 4. cndot. end; 12. cylindrical portion; 12d · a pedestal portion; 12dh · divot; 12E · outer peripheral wall portion; 12 h. eave; 12j · coil support; 12 jL. major diameter; 12 jS. minor diameter; 12N · inner peripheral wall portion; 13. coil; 13A. layer 1; 13 B.2 layer; 13℃ layer 3; 13 D.layer 4; 13 E.5 layer; 13WE · winding termination; 13 WS. winding start end; 16. upper leaf spring; 16b · angle part; 16e · outer portion; 16 g. elastic arm portion; 16i · inner part; 16 k. round hole; 16r · stack portion; 18. base part; 18k · open; 18t · projecting portion; 26. 26A, 26B. lower leaf spring; 26c · inner junction portion; 26d · outer junction portion; 26dt · through-hole; 26e · outer portion; 26 g. resilient arm portion; 26h · web portion; 26i · inner part; 26 k. round hole; 26t · through-hole; 33. 33A, 33B. an extension; 33 c.a.connection; 33k · plug-through; 33m · winding; 33s · repeat; 52. flange portion; 52k · gap portion; 72. 72A, 72B. holding part; 101. lens driving device; AD · adhesive; CL. coating; IL. insulating layer; JD. optical axis; MK. a drive mechanism; MW · metal wire; RG. stationary side components; SD & solder; WL. fusion coating.

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. 2(a) is a top perspective view of the lens driving device 101, and fig. 2(B) is a front view of the lens driving device 101 as viewed from the Y2 side. Fig. 3(a) is a plan view of the lens driving device 101, and fig. 3(B) is a bottom view of the lens driving device 101. Fig. 4(a) is a top perspective view of the lens driving device 101 in a state where the plate spring holding member 1 is removed. Fig. 4(B) is a top 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 drive mechanism MK for moving the lens holding member 2 in the optical axis direction (Z-axis direction); a plate spring 6 that supports the lens holding member 2 so as to be movable in the optical axis direction; a fixed-side member RG to which the plate spring 6 is fixed; and a metal member 7 for electrically connecting an external power source and the lens driving device 101. The lens body is, for example, a cylindrical lens barrel having 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 of the lens body and a direction parallel to the optical axis JD.

As shown in fig. 1, drive mechanism MK includes: a long annular coil 3 wound; a yoke 4 serving as a cover member that also serves as a rectangular box-shaped 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 as a support member in which metal member 7 is embedded. 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 image pickup device (not shown) is mounted. The camera module includes a substrate, a lens driving device 101, a lens body mounted on the lens holding member 2, and an image pickup device mounted on the substrate so as to face the lens body. The coil 3 is connected to a power supply via the lower plate spring 26, the metal member 7, and the substrate. When a current flows through the coil 3, the driving mechanism MK generates an electromagnetic force along the optical axis direction.

The lens driving device 101 realizes an autofocus function by moving the lens holding member 2 in the optical axis direction on the image pickup element Z1 side (object side) by the electromagnetic force. Specifically, the lens driving device 101 can move the lens holding member 2 in a direction away from the image pickup device to perform macro imaging, and can move the lens holding member 2 in a direction close to the image pickup device to perform infinity imaging.

Next, the relationship between the lens holding member 2 and the drive mechanism MK will be described. Fig. 5(a) is a top perspective view of the lens holding member 2, and fig. 5(B) is a top 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. 5 (a). Fig. 6(a) is a bottom perspective view of the lens holder 2, and fig. 6(B) is a bottom perspective view of the lens holder 2 showing a state in which the coil 3 is wound around the lens holder 2 of fig. 6 (a). Fig. 7(a) is a bottom perspective view of the lens holder 2, and fig. 7(B) is a bottom perspective view of the lens holder 2 showing a state in which the coil 3 is wound around the lens holder 2 shown in fig. 7 (a). Fig. 8(a) is an enlarged view of a portion S shown in fig. 7(B), and fig. 8(B) is an enlarged view of a portion P shown in fig. 6 (B). Fig. 9(a) is a bottom view of the lens driving device 101 in a state where the metal member 7 and the base member 18 are removed, and fig. 9(B) 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. 5(a), the lens holding member 2 includes: a cylindrical portion 12 formed to have a through hole along the optical axis direction; and a flange portion (flange portion) 52 formed at an end portion on the image pickup element 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 the present embodiment, the lens body is fixed to the inside of the cylindrical portion 12 by using an adhesive without using a screw fastening structure. However, the cylindrical portion 12 may be provided with a thread groove on the inner circumferential surface of the cylindrical shape so that the lens body is attached using a screw fastening structure. Further, in the cylindrical portion 12, 4 pedestal portions 12d having recesses 12dh on the end surface on the object side are provided so as to surround the optical axis JD. As shown in fig. 4(a), the inner portion 16i of the upper leaf spring 16 is placed on the base portion 12 d.

As shown in fig. 5(a), a coil support portion 12j as an outer peripheral wall portion for supporting 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 is formed in an elongated annular shape so as to be able to support the elongated annular coil 3. Further, on the object side of the coil support portion 12j, a flange portion 12h is formed to protrude radially outward so as to face the flange portion 52 in the optical axis direction. Further, as shown in fig. 5(B), the coil 3 is wound around the outer peripheral surface of the lens holding member 2 in an elongated annular shape 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. In the present embodiment, the coil 3 is held by the lens holding member 2 without using an adhesive, but may be fixed to the lens holding member 2 using an adhesive.

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). Further, the coil 3 is disposed on the object side of the flange portion 52. As shown in fig. 6(B), 2 notches 52k are formed in the flange portion 52 so as to sandwich the optical axis JD of the lens body. Further, the extension 33, which is a part of the conductive wire (lead wire) constituting the coil 3, is inserted into the notch 52 k. Specifically, the extending portion 33A as the lead portion on the winding start end side of the coil 3 is passed through one of the notches 52k, and the extending portion 33B as the lead portion on the winding end side of the coil 3 is passed through the other of the notches 52 k.

As shown in fig. 6(a), the flange portion 52 includes: 2 holding portions 72 as protruding portions protruding downward (Z2 direction) from the surface on the imaging element side (Z2 side) and having a rectangular convex shape; 6 protruding parts 2p in a circular convex shape; and 2 contact parts 2q in a circular convex shape. At least one of the protruding portion 2p and the abutting portion 2q may be a rectangular convex shape.

As shown in fig. 6(B), 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). The extending portions 33A and 33B constituting both ends of the coil 3 are wound around the holding portion 72 and held.

As shown in fig. 6(a) and 9(a), the protruding portion 2p includes: 3 protruding portions 2p corresponding to the lower leaf spring 26A; and 3 protruding portions 2p corresponding to the lower leaf spring 26B. The inner portion 26i of each of the lower leaf spring 26A and the lower leaf spring 26B, which is a movable side support portion, is positioned and fixed to the protruding portion 2 p. The protruding portion 2p is inserted into a circular hole 26k (see fig. 10B) serving as a through portion formed in an inner portion 26i (an inner joining portion 26c (see fig. 10B)) 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 square 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. 9(B), the drive mechanism MK includes a coil 3, a yoke 4, and 4 magnets 5 arranged to face four corners of the yoke 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 can move the lens holding member 2 up and down in the optical axis direction.

The coil 3 is formed by winding a wire around the outer periphery of the lens holding member 2 as shown in fig. 6 (B). The coil 3 includes: a winding portion 13 as a coil main body portion formed by winding in a long annular shape; and an extension portion 33 extending from the winding portion 13 and wound around the holding portion 72.

The extension 33 includes: an extension portion 33A connected to an end portion (winding start end portion 13WS) 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 (winding portion 13); and an extension portion 33B connected to an end portion (winding end portion 13WE) 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, the extension 33A includes, as shown in fig. 8 (a): a winding portion 33m wound around the holding portion 72A; a connecting portion 33c extending so as to face the image pickup element side (Z2 side) of the flange portion 52; and an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the object side (Z1 side). As shown in fig. 8(B), the extension 33B includes: a winding portion 33m wound around the holding portion 72B; a connecting portion 33c extending so as to face the image pickup element side (Z2 side) of the flange portion 52; an insertion portion 33k inserted through the cutout portion 52k and extending from the image pickup device side (Z2 side) of the flange portion 52 toward the object side (Z1 side); and a repeating portion 33s extending so as to intersect (overlap) with a lead portion located at the outermost periphery (outermost layer) of the wound portion 13.

In the present embodiment, the extending portion 33A is wound around the holding portion 72A of the lens holding member 2 before the lead wire constituting the coil 3 is wound around the outer periphery of the lens holding member 2 (coil support portion 12j), that is, before the winding portion 13 is formed. In the example shown in fig. 8(a), the extension 33A as a part of the wire 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 extended portion 33A may be wound around the holding portion 72A after the lead wire is wound around the outer periphery of the lens holding member 2, that is, after the wound portion 13 is formed.

After the extension portion 33A is wound around the holding portion 72A, the lead wire is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 8(a), the lead wire extending from the winding portion 33m extends so as to face the bottom surface of the flange portion 52, and extends from the lower side of the flange portion 52 toward the upper side of the flange portion 52 through the notch portion 52 k. At this time, the portion facing the bottom surface of flange 52 constitutes connection portion 33c of extension portion 33A, and the portion passing through notch 52k constitutes insertion portion 33k of extension portion 33A. The portion located between the winding portion 33m and the insertion portion 33k and not facing the flange portion 52 also constitutes the connection portion 33c of the extension portion 33A.

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. 5 (B). The winding portion 13 is fixed to the object side of the flange portion 52 so as to be sandwiched between the flange portion 52 and the brim portion 12h in a state of being supported from the inside by the coil support portion 12j (see fig. 5 a). Since the inner peripheral surface of the winding portion 13 is isotropically and well-balanced 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 be able to easily align the optical axis JD of the lens body held by the lens holding member 2 with the respective central axes of the lens holding member 2 and the coil 3.

When the winding of the lead wire around the outer periphery of the lens holding member 2 is completed, the extending 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 image pickup device side of the flange portion 52 via the notch portion 52k as shown in fig. 8 (B). 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. 8(B), the extending portion 33B is wound around the holding portion 72B by 3 turns. The portion of the extending portion 33B located between the insertion portion 33k and the winding portion 33m constitutes a connecting portion 33c of the extending portion 33B.

Next, the yoke 4 constituting the drive mechanism MK will be described. In the present embodiment, the yoke 4 is produced by punching, drawing, or the like a plate material made of a soft magnetic material such as iron. Specifically, the yoke 4 has a box-like outer shape defining the housing portion 4s as shown in fig. 1. Further, the yoke 4 has: a rectangular cylindrical outer wall portion 4A; and a flat annular upper surface portion 4B provided continuously to an upper end (end on the Z1 side) of the outer wall portion 4A. The yoke 4 configured as described above is housed in the housing portion 4s so as to sandwich the magnet 5 between the outer wall portion 4A and the coil 3 as shown in fig. 9(B), and is coupled to the base member 18 to constitute a frame together with the base member 18 as shown in fig. 2 (a). However, the yoke 4 may be replaced with a cover member made of a non-magnetic material such as austenitic stainless steel.

Next, the magnet 5 constituting the drive mechanism MK will be described. The magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface as shown in fig. 1. Further, as shown in fig. 9(B), the 4 magnets 5 are located outside the coil 3 and arranged so as to face the four corners of the rectangular-cylindrical outer wall portion 4A constituting the yoke 4. Further, the magnet 5 is fixed to the yoke 4 with an adhesive. The magnet 5 is disposed, for example, such that the inner side (the side facing the optical axis JD) is an N pole, 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. 10(a) and 10(B) are diagrams for explaining the leaf spring 6. Fig. 10(a) is a plan view of the upper leaf spring 16, and fig. 10(B) is a plan view of the lower leaf spring 26. Fig. 11 a, 11B, and 11C are diagrams illustrating an example of a connection structure of 3 components (the plate spring holding member 1, the yoke 4, and the upper plate spring 16). Specifically, fig. 11(a) is a bottom perspective view of the plate spring holding member 1. That is, in fig. 11(a), illustration of the yoke 4 and the upper plate spring 16, which are 2 out of 3 members, is omitted. Fig. 11(B) is a bottom perspective view of the leaf spring holding member 1 and the upper leaf spring 16. That is, in fig. 11(B), the yoke 4, which is 1 of the 3 members, is not shown. Fig. 11(C) is a bottom perspective view of the plate spring holding member 1, the yoke 4, and the upper plate spring 16. That is, fig. 11(C) shows all 3 components. Fig. 12 a and 12B are views illustrating an example of a connection structure between the lower leaf spring 26B and the coil 3 (the extending portion 33B). Specifically, fig. 12(a) is an enlarged view of the portion T shown in fig. 9(a), and fig. 12(B) is an enlarged view of the lower plate spring 26B, the coil 3, and the lens holding member 2 when the portion T shown in fig. 9(a) is viewed from the X1 side. In fig. 12(a) and 12(B), the brazing material SD for joining the coil 3 and the lower plate spring 26B is shown by cross hatching. Fig. 13 is a diagram illustrating base member 18 as stationary-side member RG. Specifically, the base member 18 includes an exploded perspective view and a complete perspective view of the metal member 7.

In the present embodiment, the plate spring 6 is made of a metal plate mainly made of a copper alloy. The plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the yoke 4 as shown in fig. 4 (a); and a lower plate spring 26 disposed between the lens holding member 2 and the base member 18 as shown in fig. 9 (a). In a state where the lens holding member 2 is engaged with the plate spring 6 (the upper plate spring 16, the lower plate spring 26A, and the lower plate spring 26B), the plate spring 6 supports the lens holding member 2 so that the lens holding member 2 can move in the optical axis direction (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. 10(a), the upper leaf spring 16 includes: an inner portion 16i, which is a movable side support portion, having a substantially rectangular shape and fixed to the lens holding member 2; an outer portion 16e as a fixed-side support portion fixed to fixed-side member RG (plate spring holding member 1 and yoke 4); and 4 resilient arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the inner portion 16i is provided in an annular shape so as to surround the optical axis JD. The outer portion 16e has 4 corner portions 16b, and 4 stacks 16r connecting adjacent 2 of the 4 corner portions 16 b.

In this way, the upper plate spring 16 is formed to be substantially 2-fold symmetrical, and is configured to be fixed to the lens holding member 2 at the inner portion 16i and to be fixed to the plate spring holding member 1 and the yoke 4 at the outer portion 16 e. Therefore, the upper plate spring 16 can support the lens holding member 2 in a well-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. 5 a). Further, the inner portion 16i and the base portion 12d are joined by 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 is fixed by an adhesive.

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

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

More specifically, the projection 1p of the leaf spring holding member 1 includes the 1 st projection 1p1 to the 4 th projection 1p4 as shown in fig. 11 (a). The circular hole 4k formed in the yoke 4 includes the 1 st circular hole 4k1 to the 4 th circular hole 4k4 as shown in fig. 4 (B). The circular hole 16k formed in the upper leaf spring 16 includes 1 st to 4 th circular holes 16k1 to 16k4 as shown in fig. 10 (a). Further, as shown in fig. 11(B), the 1 st protrusion 1p1 is inserted into the 1 st circular hole 16k1 formed in the upper plate 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. As shown in fig. 11(C), 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. 11(a) to 11(C), the projection 1p is shown in a state in which the end after hot riveting is deformed. The projection 1p may also be cold-riveted.

In this way, 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 floated in the air when no current flows through the coil 3, but is biased toward the image pickup device side (Z2 side) by the plate spring 6, and is brought into contact with the upper surface (surface on the Z1 side) of the base member 18 via the contact portion 2 q. When a current flows through the coil 3, the lens holding member 2 moves toward the object side (Z1 side) by an electromagnetic force, and is separated from the base member 18 and held in the air. At this time, the portion of the elastic arm portion 16g of the upper leaf spring 16 that contacts the inside portion 16i is displaced upward (in the direction Z1). The concave portion 1r of the leaf spring holding member 1 is formed to allow this displacement.

As shown in fig. 4a, even when no current flows through the coil 3, the lens holding member 2 has an upper end that protrudes upward (in the direction Z1) from the upper surface portion 4B of the yoke 4. Therefore, the recess 1r of the plate spring holding member 1 is formed to allow further protrusion of the lens holding member 2 when a current flows through the coil 3, in addition to allowing 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 configured to be substantially bilaterally symmetrical to each other, and the inner portions (the side facing the optical axis JD) are formed in substantially semicircular shapes. 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 lens holding member 2; outer portion 26e as a fixed side support portion fixed to fixed side member RG (base member 18); and 2 resilient arm portions 26g located between the medial portion 26i and the lateral portion 26 e.

As shown in fig. 10(B), the inner portion 26i of each of the lower leaf springs 26A and 26B includes: 3 inner engaging portions 26c engaged with the lens holding member 2; and a web portion 26h opposed to the extension portion 33 of the coil 3.

When the lower plate springs 26A and 26B are attached to the lens holding member 2, the 6 protruding portions 2p of the lens holding member 2 shown in fig. 6(a) are inserted into and fitted into circular holes 26k as through portions provided in the inner engagement portions 26c of the lower plate springs 26A and 26B shown in fig. 10 (B). 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. 12 a and 12B, the connecting plate portion 26h constituting the inner portion 26i of the lower plate spring 26B faces the surface of the lens holder 2 on the image pickup device side (Z2 side) when the lower plate spring 26B is attached to the lens holder 2. That is, the surface of the connecting plate 26h on the object side (Z1 side) faces the surface of the flange 52 constituting the lens holding member 2 on the image pickup device side (Z2 side). Further, as shown in fig. 12B, the connection portion 33c of the extending portion 33B of the coil 3 extends through a space between the surface of the inner portion 26i of the lower plate spring 26B on the object 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 26B is attached to the lens holding member 2, as shown in fig. 12B, the holding portion 72B protrudes downward (in the Z2 direction) from the inner portion 26i of the lower leaf spring 26B so that the tip thereof is positioned closer to the image pickup device side (Z2 side) than the inner portion 26 i. Further, a part of the winding portion 33m is also wound around the holding portion 72B so as to be positioned closer to the image pickup device side (Z2 side) than the inner portion 26 i.

The lower plate spring 26B and the extension 33B of the coil 3 are electrically and mechanically connected to each other by the brazing material SD. Specifically, as shown in fig. 9(a), the lower plate spring 26B is attached to the lens holding member 2 such that a circular hole 26k formed in the inner joining portion 26c is fitted in the protruding portion 2p of the lens holding member 2. Further, the projecting portion 2p of the lens holding member 2 is subjected to hot caulking, and the solder paste applied to the connecting plate portion 26h is heated by laser. However, the lower plate spring 26B and the extending portion 33B 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. 12(a) and 12(B) is also applied to the connection of the lower plate spring 26A, the lens holding member 2, and the coil 3.

As shown in fig. 10(B), the outer portion 26e of the lower leaf spring 26A includes 2 outer engaging portions 26d that engage with the base member 18. Similarly, the outer portion 26e of the lower leaf spring 26B includes 2 outer engaging portions 26d that engage with the base member 18.

The base member 18 is manufactured by injection molding using synthetic resin such as liquid crystal polymer, for example. In the present embodiment, the base member 18 is a member having a substantially rectangular plate-like outer shape as shown in fig. 13, and a circular opening 18k is formed at the center. Further, 4 projecting portions 18t projecting upward are provided on the surface of the base member 18 on the object side (Z1 side). The protruding portion 18t is inserted into and fitted into a through hole 26t (see fig. 10B) 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 protruding portion 18t is fixed to the outer joining portion 26d by hot riveting. In fig. 13, the protruding portion 18t is shown in a state in which the end subjected to the hot riveting is deformed. The projection 18t may be fixed to the outer joining portion 26d by cold riveting.

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

The metal member 7 includes 1 st to 3 rd metal members 7A to 7C. The 1 st metal member 7A has a connection portion 7AC exposed from the upper surface (surface on the Z1 side) of the base member 18, and the 2 nd metal member 7B has a connection portion 7BC exposed from the upper surface (surface on the Z1 side) of the base member 18. The surface of the connection portion 7AC and the surface of the connection portion 7BC are located on the same plane.

The connection portion 7AC is connected to the outer-side joining portion 26d of the lower leaf spring 26B via a conductive joining material in a state of facing the through hole 26dt (see fig. 10B) formed in the outer-side joining portion 26d of the lower leaf spring 26B. The conductive bonding material is, for example, a solder or a conductive adhesive. In the present embodiment, the conductive bonding material is a conductive adhesive.

Similarly, the connection portion 7BC is connected to the outer-side joining portion 26d of the lower leaf spring 26A via a conductive joining material in a state facing the through hole 26dt (see fig. 10B) formed in the outer-side joining portion 26d of the lower leaf spring 26A.

The 1 st metal member 7A has a terminal portion 7AT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18, and the 2 nd metal member 7B has a terminal portion 7BT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18.

The 3 rd metal member 7C has end portions 7C 1-7C 4 protruding outward in a direction perpendicular to the optical axis direction from the corner of the base member 18. The end portions 7C1 to 7C4 are configured to contact the lower ends of the four corners of the yoke 4 as shown in fig. 2(a) and 2(B), respectively.

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

Next, the coil 3 held by the lens holding member 2 will be described with reference to fig. 14(a), 14(B) to 16. Fig. 14(a), 14(B), 15(a), and 15(B) show the lens holding member 2 holding the coil 3. Specifically, fig. 14(a) is a side view of the lens holding member 2 around which the coil 3 is wound, and fig. 14(B) is a cross-sectional view of the lens holding member 2 around which the coil 3 is wound, at a virtual plane parallel to the XY plane containing the line segment L1 shown in fig. 14 (a). Fig. 15(a) is a cross-sectional perspective view of the lens holding member 2 around which the coil 3 is wound, at an imaginary plane parallel to the XZ plane including the line segment L2 shown in fig. 14 (a). Fig. 15(B) is a cross-sectional view of the lens holding member 2 around which the coil 3 is wound when viewed from the Y2 side, the imaginary plane being parallel to the XZ plane including the line segment L2 shown in fig. 14 (a). Fig. 16 is an enlarged view of a portion U surrounded by a broken line shown in fig. 15 (B).

As shown in fig. 14(B), the coil support portion 12j of the lens holding member 2 includes: an inner peripheral wall portion 12N of a substantially circular inner peripheral wall having a diameter D1 as viewed from above; and an outer peripheral wall portion 12E having a substantially elliptical outer peripheral wall having a short diameter D2 and a long diameter D3 when viewed from above.

The winding portion 13 is held by the outer peripheral wall portion 12E. That is, the lead wire constituting the winding portion 13 is wound around the outer peripheral wall portion 12E having a substantially elliptical outer peripheral wall when viewed from above.

In a configuration in which a wire is wound around an outer peripheral wall portion having a polygonal (e.g., octagonal) outer peripheral wall when viewed from above, the wire wound around the outer peripheral wall portion is subjected to a winding tension at a portion corresponding to each vertex of the polygon, but is not subjected to a winding tension at a portion corresponding to each side of the polygon. Therefore, the outer peripheral wall portion having the polygonal outer peripheral wall when viewed from the top is more likely to cause winding disorder than the outer peripheral wall portion 12E having the substantially elliptical outer peripheral wall when viewed from the top as in the present embodiment. On the other hand, as in the present embodiment, the wire wound around the outer peripheral wall portion 12E having the substantially elliptical outer peripheral wall when viewed from the top is always under a winding tension, and thus regular winding is easily achieved. As a result, the outer peripheral wall portion 12E can improve the adhesion between the lens holding member 2 and the lead wire.

In this way, the coil support portion 12j of the lens holding member 2 around which the lead wire constituting the winding portion 13 is wound has: a long diameter portion 12jL corresponding to a portion of the outer peripheral wall portion 12E having the largest diameter; and a short diameter portion 12jS corresponding to a portion of the outer peripheral wall portion 12E having the smallest diameter.

Further, the long diameter portion 12jL is formed at a position corresponding to the position where the notch portion 52k is formed and corresponding to the position of the extending portion 33 continuous with the end of the winding portion 13 as shown in fig. 14 (B).

More specifically, as shown in fig. 15(a), the conductive wire constituting the winding portion 13 is wound around the outer peripheral wall portion 12E of the coil support portion 12j so as to form a 5-fold layer. The 5-fold layers include the 1 st layer 13A, the 2 nd layer 13B, the 3 rd layer 13C, the 4 th layer 13D, and the 5 th layer 13E. However, the conductive wire constituting the winding portion 13 may be wound around the outer peripheral wall portion 12E so as to form a layer of 4 or less or 6 or more.

The 1 st to 4 th layers 13A to 13D each include a wire portion having a predetermined number of turns (1 st turn). The outermost layer, i.e., the 5 th layer 13E, includes a wire portion having a predetermined number of turns (2 nd turn) less than the 1 st turn. In the example shown in fig. 15(a), the 1 st turn is 11 turns, and the 2 nd turn is 9 turns.

The outermost layer, i.e., the 5 th layer 13E, is composed of 9 turns of the wire portion from the 1 st wire portion 13E1 located at the lowermost side (Z2 side) to the 9 th wire portion 13E9 located at the uppermost side (Z1 side) as shown in fig. 15 a.

The 9 th wire part 13E9 is connected to the repeated part 33s of the extension part 33B at the position of the winding termination part 13 WE. As shown in fig. 15B, the overlap portion 33s extends downward (in the Z2 direction) from the 1 st wire portion 13E1 so as to cross the outer side (the X1 side) of the 8 th wire portion 13E8, changes direction inward (in the X2 direction) at the position of the 1 st wire portion 13E1, and is connected to the insertion portion 33 k.

As shown in fig. 16, the conductive wire constituting the winding portion 13 has a conductive metal wire MW and an insulating coating CL for covering the metal wire MW. The cladding CL includes an insulating layer IL and a cladding layer WL. In the present embodiment, the metal wire MW is formed of copper, the insulating layer IL is formed of a urethane resin, and the cladding layer WL is formed of a polyimide resin. Further, the weld layers WL of the respective adjacent 2 lead portions are welded to each other. Fig. 16 shows a state in which the fusion-bonding layer WL of the 7 th wire part 13E7 constituting the 5 th layer 13E is integrated with the fusion-bonding layer WL of the adjacent other wire part by thermal fusion-bonding. The thermal welding is achieved by heat treatment with hot air or the like, for example. The adjacent other wire portions include: the 6 th wire part 13E6 and the 8 th wire part 13E8 constituting the 5 th layer 13E; and a 6 th wire part 13D6 and a 7 th wire part 13D7 constituting the 4 th layer 13D.

In the present embodiment, only the weld layer WL of the overlapping portion 33s of the extension portion 33B is in contact with the weld layer WL of each of the 1 st wire part 13E1 to the 8 th wire part 13E8 constituting the 5 th layer 13E, which is the outermost layer, and is not integrated by welding. However, the weld layer WL of the overlap portion 33s may be integrated with the weld layers WL of the 1 st to 8 th wire portions 13E1 to 13E8 by thermal welding. In the wound portion 33m of the extension portion 33B, the metal wire MW is exposed without being covered with the coating layer CL. This is for electrical connection with the lower plate spring 26B. The same applies to the wound portion 33m of the extension portion 33A.

As described above, the lens driving device 101 according to the present embodiment includes: a base member 18 as a support member; a lens holding member 2 capable of holding a lens body; a coil 3 held by the lens holding member 2; a magnet 5 opposed to the coil 3; and a pair of lower leaf springs 26 arranged to connect the base member 18 and the lens holding member 2 and to support the lens holding member 2 movably in the optical axis direction. The coil 3 has: a winding portion 13 formed of a conductive wire wound around the outer periphery of the lens holding member 2; an extension portion 33A as a 1 st extension portion extending from the winding start end portion 13WS of the winding portion 13 and connected to the lower leaf spring 26A, which is one of the lower leaf springs 26; and an extension portion 33B as a 2 nd extension portion extending from the winding end portion 13WE of the winding portion 13 and connected to the lower leaf spring 26B, which is the other one of the lower leaf springs 26. The conductive wire constituting the winding portion 13 has a metal wire MW and an insulating coating CL covering the metal wire MW. Further, the extending portion 33B extends so as to intersect with the lead portion located on the outermost periphery (outermost layer) of the winding portion 13 with the winding end portion 13WE as a base point.

Specifically, as shown in fig. 15B, the overlapping portion 33s of the extending portion 33B extends downward (in the Z2 direction) so as to intersect (overlap) the 1 st to 8 th wire portions 13E1 to 13E8 constituting the 5 th layer 13E which is the wire portion located at the outermost layer of the winding portion 13, that is, so as to cross the outer sides (X1 side) of the 1 st to 8 th wire portions 13E1 to 13E8, and is connected to the insertion portion 33 k.

According to this structure, the lens driving device 101 can make the coating CL of the wire part difficult to peel off at the winding termination portion 13 WE. The extension 33B is for the following purpose: when the substrate is pulled downward (in the direction Z2) in order to wind the substrate around the holding portion 72B, a force is generated at the winding end portion 13WE to press the fusion layer WL of the 9 th wire part 13E9 constituting the 5 th layer 13E against the fusion layer WL of the 8 th wire part 13E8 adjacent to the lower side of the 9 th wire part 13E 9. That is, the extension 33B is for the purpose of: so that a force of pulling away the fusion coat WL of the 9 th wire part 13E9 constituting the 5 th layer 13E from the fusion coat WL of the 8 th wire part 13E8 adjoining on the lower side of the 9 th wire part 13E9 is not generated. As a result, in the lens driving device 101, even when an impact due to dropping or the like is applied, generation of peeling debris of the coating layer can be suppressed, and adhesion of foreign matter such as peeling debris to the image pickup element can be suppressed. Therefore, the lens driving device 101 can suppress the adverse effect of foreign matter such as peeling debris on the image.

In the example shown in fig. 15(a), the conductive wire constituting the wound portion 13 is wound in order from the Z2 side toward the Z1 side in the odd-numbered layers including the 1 st layer 13A, the 3 rd layer 13C, and the 5 th layer 13E, and in order from the Z1 side toward the Z2 side in the even-numbered layers including the 2 nd layer 13B and the 4 th layer 13D, as indicated by an arrow AR 1. Therefore, in the example of fig. 15(a), in order to configure the winding portion 13 such that the repeated portion 33s of the extending portion 33B and the lead portion of the winding portion 13 located at the outermost layer intersect (overlap) each other, the outermost layer needs to be an odd-numbered layer. This is because: when the outermost layer is an even-numbered layer, in the case where the extension portion 33B is pulled downward (in the Z2 direction) in order to wind the outermost layer into the holding portion 72B, a force is generated to pull the cladding layer WL of the lowermost wire portion located on the lowermost side (on the Z2 side) out of the outermost wire portions from the cladding layer WL of the wire portion adjacent to the lowermost wire portion on the upper side thereof at the position of the winding terminal end portion 13 WE.

The winding terminal portion 13WE is typically provided between one end portion and the other end portion in the optical axis direction of the winding portion 13. In the example shown in fig. 15B, the 5 th layer 13E as the outermost layer is configured to include a lead portion of 11 turns at the maximum, and the winding terminal end portion 13WE is arranged between one end portion (a portion in contact with the brim portion 12 h) and the other end portion (a portion in contact with the flange portion 52) of the winding portion 13 in the optical axis direction, that is, at a position of the 9 th lead portion 13E9 of the 5 th layer 13E. The 9 th wire part 13E9 is the uppermost wire part located uppermost (Z1 side) among the wire parts constituting the outermost layer.

The winding end portion 13WE may be disposed at any position from the 2 nd to 8 th lead portions 13E2 to 13E8 of the 5 th layer 13E. That is, the uppermost lead portion of the 5 th layer 13E may be any one of the 2 nd lead portion 13E2 to the 8 th lead portion 13E 8. The winding terminal portion 13WE can be disposed at the position of the 10 th wire portion when the 5 th layer 13E includes the 10 th wire portion, and at the position of the 11 th wire portion when the 5 th layer 13E includes the 11 th wire portion. In this way, the number of turns of the outermost layer of the winding portion 13 may be any number of turns of 2 or more.

In the present embodiment, the position of the winding end portion 13WE is set to: the overlapping portion 33s of the extension portion 33B extending from the winding terminal portion 13WE to the holding portion 72B is made continuous with the insertion portion 33k at the central portion of the notch portion 52k as shown in fig. 12(a) and 12 (B). That is, the position of the winding terminal portion 13WE is set so that the extension portion 33B does not contact the flange portion 52 at the position of the insertion portion 33 k. Therefore, even when an impact due to dropping or the like is applied to the lens driving device 101, the extension portion 33B does not come into contact with the edge of the flange portion 52 at the position of the notch portion 52k, and is not disconnected due to contact with the edge of the flange portion 52.

The lens holding member 2 typically has a cylindrical portion 12 around which the wire is wound, and the outer periphery of the annular cross section of the cylindrical portion 12 is formed in an oval shape. Oval includes oblong, rounded rectangle, ellipse, oval, or the like. In the above-described embodiment, the cylindrical portion 12 is formed such that the outer periphery of the annular cross section has a substantially elliptical shape having the short diameter D2 and the long diameter D3 as shown in fig. 14 (B).

With this configuration, the cylindrical portion 12 of the lens holding member 2 can be easily wound around the wound portion 13. This is because the conductive wire regularly wound around the cylindrical portion 12 formed in an oval shape on the outer periphery of the annular cross section is in a state of being constantly applied with a winding tension. Further, the wound portion 13 wound around the cylindrical portion 12 formed in an oval shape on the outer periphery of the annular cross section is less likely to move relative to the cylindrical portion 12. This is because the adhesion between the cylindrical portion 12 and the winding portion 13 is improved. The moving difficulty also plays a role in preventing the wire from being broken. In the above-described embodiment, the winding portion 13 is directly wound around and held by the coil support portion 12j of the cylindrical portion 12 without using an adhesive, but may be fixed to the coil support portion 12j after being wound around the coil support portion 12j using an adhesive.

The lens holding member 2 typically has a pair of holding portions 72 that support the flange portion 52 of the winding portion 13 and hold the extending portion 33. In the present embodiment, the pair of holding portions 72 includes a holding portion 72A that holds the extending portion 33A and a holding portion 72B that holds the extending portion 33B.

As shown in fig. 14B, the cylindrical portion 12 has a long diameter portion 12jL having the largest diameter dimension passing through the optical axis JD in a plan view (viewed from above). Further, the flange portion 52 is provided with a notch portion 52k through which the extending portion 33 passes, corresponding to the long diameter portion 12 jL.

According to this configuration, on the lower surface (surface on the Z2 side) of the flange portion 52, the area (or the radial width) of the portion corresponding to the long diameter portion 12jL is larger than the area (or the radial width) of the portion corresponding to the short diameter portion 12 jS. This is because the coil support portion 12j of the cylindrical portion 12 has an inner peripheral wall portion 12N forming a substantially circular inner peripheral wall. Therefore, in the lens holding member 2, even if the notch portion 52k is provided at a position corresponding to the long diameter portion 12jL, the area (width in the radial direction) in which the lower leaf spring 26 is arranged can be secured.

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 embodiment can be applied to various modifications, replacements, and the like without departing from the scope of the present invention. The features described with reference to the above embodiments can be combined as appropriate as long as the technical contradiction is not present.

For example, in the above-described embodiment, the holding portion 72B around which the extending portion 33B is wound is configured to protrude downward (in the Z2 direction) from the lower surface (on the Z2 side) of the flange portion 52. However, the holding portion 72B may be configured to protrude in a direction other than the downward direction, such as the lateral direction, the obliquely upward direction, or the obliquely downward direction.

Fig. 17 is an enlarged view of the lower plate spring 26B, the coil 3, and the lens holding member 2, and corresponds to fig. 12 (B). The lens holding member 2 shown in fig. 17 is different from the lens holding member 2 shown in fig. 12(B) in that it includes a holding portion 72B protruding from the cylindrical portion 12 in the X1 direction at the position of the notch portion 52 k.

The holding portion 72B shown in fig. 17 is a T-shaped projection including a coming-off prevention portion for preventing the winding portion 33m from coming off in the X1 direction. The retaining portions protrude from the distal end of the holding portion 72B in the Y1 direction and the Y2 direction, respectively.

The portion wound around the holding portion 72B shown in fig. 17 on the lower side (Z2 side) of the winding portion 33m is electrically and mechanically connected to the inner portion 26i of the lower leaf spring 26B via the brazing material SD. With this configuration, the holding portion 72B shown in fig. 17 can more reliably prevent the contact between the extension portion 33B and the flange portion 52.

In the above embodiment for realizing the autofocus function, the lower plate spring 26A is electrically connected to the extension portion 33A, and the lower plate spring 26B is electrically connected to the extension portion 33B, but the present invention is not limited to this configuration. The present invention may include, for example, the following structure: in the lens driving device with camera shake correction function, the upper plate spring 16 is divided into 2 parts, one of which is electrically connected to the extending portion 33A and the other of which is electrically connected to the extending portion 33B. In this configuration, the upper plate spring 16 is disposed so as to connect the magnet holder as a support member and the lens holding member 2, and is configured to support the lens holding member 2 so as to be movable in the optical axis direction. The magnet holder is a member that holds the magnet 5 facing the coil 3 held by the lens holding member 2, and is typically connected to the base member 18 via a support wire, and is supported by the support wire so as to be movable in a direction perpendicular to the optical axis direction. Specifically, the magnet holder is configured to be movable in a direction perpendicular to the optical axis direction by a drive mechanism including the magnet 5 and a coil different from the coil 3 provided on the base member 18 so as to face the magnet 5. In this case, the holding portion 72 as the protruding portion may be provided on the side where the upper leaf spring 16 is disposed, that is, on the upper side of the lens holding member 2.

Claims (5)

1. A lens driving device is provided with:

a support member;

a lens holding member capable of holding a lens body;

a coil held by the lens holding member;

a magnet opposed to the coil; and

a pair of leaf springs disposed to connect the support member and the lens holding member and to support the lens holding member movably in the optical axis direction,

it is characterized in that the preparation method is characterized in that,

the coil has: a winding portion formed of a conductive wire wound around an outer periphery of the lens holding member; a 1 st extending portion extending from a winding start end portion of the winding portion and connected to one of the leaf springs; and a 2 nd extending portion extending from a winding end portion of the winding portion and connected to the other leaf spring,

the lead wire has a metal wire and an insulating coating layer covering the metal wire,

the 2 nd extending portion extends so as to cross a lead portion located on an outermost periphery of the winding portion with the winding end portion as a base point.

2. The lens driving device according to claim 1,

the winding end portion is provided between one end portion and the other end portion of the winding portion in the optical axis direction.

3. The lens driving device according to claim 1 or 2,

the lens holding member has a cylindrical portion around which the wire is wound, and an outer periphery of an annular cross section of the cylindrical portion has an oval shape.

4. The lens driving device according to claim 3,

the lens holding member has a flange portion for supporting the winding portion and a pair of holding portions for holding the 1 st extending portion and the 2 nd extending portion,

the cylindrical portion has a major axis portion having a maximum diameter dimension passing through the optical axis in a plan view,

the flange portion is provided with a notch portion corresponding to the long diameter portion for allowing the 1 st extending portion and the 2 nd extending portion to pass through, respectively.

5. A camera module, comprising:

the lens driving device according to any one of claims 1 to 4;

the lens body; and

and an imaging element facing the lens body.

Images