Lens drive device and camera module

Abstract

To provide a lens drive device with which it is possible to suppress a difference of electromagnetic forces due to a difference in the number of turns of wire.SOLUTION: A lens drive device 101 comprises a lens holding member 2 and a coil 3. The coil 3 includes, between a flange-like part 52 and a restriction part 12h of the lens holding member 2, a winding part 13 formed by winding a wire on the outer circumference of a cylindrical part 12. The winding part 13 has six winding layers WL that are stacked one on another from an outer circumferential surface EF of a coil support part 12j toward the radial outside. A first wire annular section WA11 of the first turn of the winding part 13 leading to a left extension part 33L is arranged such that a second section WP2 is located closer to the restriction part 12h side (Z1 side) by a dimension appropriately equal to a thickness DS1 of the wire than is a first section WP1.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present disclosure relates to a lens driving device mounted on, for example, a mobile device with a camera, and a camera module including the lens driving device.

Background Art

[0002] Conventionally, a lens driving device is known that moves a lens holding member along the optical axis direction by a driving unit composed of a coil wound around the outer periphery of the lens holding member and a magnet attached to a fixed-side member (see Patent Document 1). In this lens driving device, the start winding portion and the end winding portion of the wire forming the coil are arranged on opposite sides with the optical axis interposed therebetween.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described lens driving device, the wire forming the coil is wound around the lens holding member such that the number of turns of the wire forming the outermost layer of the coil differs by one turn between one semi-circular portion and the other semi-circular portion existing between the start winding portion and the end winding portion. That is, the wire forming the coil is wound around the lens holding member such that one semi-circular portion is shorter than the other semi-circular portion by half a turn. Therefore, when an electric current flows through the coil, there is a possibility that a slight difference occurs in the electromagnetic force generated between the coil and the magnet.

[0005] Therefore, it is desirable to provide a lens driving device that can suppress the difference in electromagnetic force caused by such a difference in the number of turns of the wire.

Means for Solving the Problems

[0006] A lens driving device according to an embodiment of the present invention includes a fixed-side member, a lens holding member having a cylindrical portion capable of holding a lens body, a support member that supports the lens holding member so as to be movable in the optical axis direction, and at least a coil provided outside the cylindrical portion of the lens holding member and a plurality of magnets facing the coil, and a driving unit that moves the lens holding member in the optical axis direction. The lens holding member has a flange portion that protrudes radially outward from the outer peripheral surface of the cylindrical portion and a restricting portion that faces the flange portion with a gap therebetween in the optical axis direction. In the flange portion, a first notch portion and a second notch portion are formed at positions facing each other with the cylindrical portion interposed therebetween, a first holding portion is provided corresponding to the first notch portion, and a second holding portion is provided corresponding to the second notch portion. The coil includes a winding portion formed by winding a wire around the outer periphery of the cylindrical portion between one surface of the flange portion and the restricting portion, a first extending portion connected to the start portion of the winding of the winding portion, and a second extending portion connected to the end portion of the winding of the winding portion. The first extending portion passes through the first notch portion and is held by the first holding portion, and the second extending portion passes through the second notch portion and is held by the second holding portion. In the lens driving device, the winding portion has a plurality of winding layers stacked radially outward from the outer peripheral surface of the cylindrical portion, and a first partial loop of the wire forming the first turn of the winding portion connected to the first extending portion is located in a second region that is located between the second notch portion and the first notch portion and is different from the first region, and is located closer to the restricting portion by approximately the same dimension as the thickness of the wire than a first partial loop that is located in a first region between the first notch portion and the second notch portion along the outer peripheral surface of the cylindrical portion.

Advantages of the Invention

[0007] The above-described lens driving device can suppress a difference in electromagnetic force caused by a difference in the number of turns of the wire.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the lens driving device 101 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the lens driving device 101, and FIG. 2 is an exploded perspective view of the lens driving device 101. In FIGS. 1 and 2, X1 represents one direction of the X-axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. Also, Y1 represents one direction of the Y-axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y-axis. Similarly, Z1 represents one direction of the Z-axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z-axis. In FIG. 1, the X1 side of the lens driving device 101 corresponds to the front side (front face side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (rear face side) of the lens driving device 101. Also, the Y1 side of the lens driving device 101 corresponds to the left side of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the right side of the lens driving device 101. Further, the Z1 side of the lens driving device 101 corresponds to the upper side (subject side) of the lens driving device 101, and the Z2 side of the lens driving device 101 corresponds to the lower side (imaging element side) of the lens driving device 101. The same applies to other figures.

[0010] As shown in FIG. 2, the lens driving device 101 includes a lens holding member 2 capable of holding a lens body (not shown), a driving unit DM that moves the lens holding member 2 along the optical axis direction (Z-axis direction), a leaf spring 6 as a support member that supports the lens holding member 2 so as to be movable in the optical axis direction, a fixed-side member FB to which the leaf spring 6 is fixed, and a metal member 7 that provides an electrical connection between an external power source and the lens driving device 101. The lens body is, for example, a cylindrical lens barrel having at least one lens, and is configured such that its central axis extends along the optical axis direction. The optical axis direction includes the direction of the optical axis OA with respect to the lens body and a direction parallel to the optical axis OA.

[0011] As shown in FIG. 2, the drive unit DM includes a coil 3 wound around the lens holding member 2, a yoke 4 serving as a cover member that also functions as a rectangular box-shaped outer case, and four magnets 5 arranged to face the four corners of the yoke 4. In the present embodiment, the magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface. The fixed-side member FB includes a leaf spring holding member 1, a yoke 4, and a base member 18 in which a metal member 7 is embedded. The leaf spring 6 includes an upper leaf spring 16 connecting between the lens holding member 2 and the yoke 4, and a lower leaf spring 26 connecting between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a lower left leaf spring 26L and a lower right leaf spring 26R.

[0012] As shown in FIG. 1, the lens driving device 101 has a substantially rectangular parallelepiped shape and is mounted on a substrate (not shown) on which an image sensor (not shown) is mounted. The camera module includes the substrate, the lens driving device 101, a lens body mounted on the lens holding member 2, and an image sensor mounted on the substrate so as to face the lens body. The coil 3 is connected to a power source via the lower leaf spring 26, the metal member 7, and the substrate. When an electric current flows through the coil 3, the drive unit DM generates an electromagnetic force along the optical axis direction.

[0013] The lens driving device 101 utilizes this electromagnetic force to realize an autofocus function by moving the lens holding member 2 along the optical axis direction on the Z1 side (subject side) of the image sensor. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image sensor to enable macro photography, and moves the lens holding member 2 in a direction approaching the image sensor to enable infinity photography.

[0014] Next, with reference to FIGS. 3 to 6, the positional relationship between the lens holding member 2 and the drive unit DM will be described. FIG. 3 is an upper perspective view of the lens driving device 101 in a state where a part of the components is removed. Specifically, the upper view of FIG. 3 is an upper perspective view of the lens driving device 101 with the leaf spring holding member 1 removed, the middle view of FIG. 3 is an upper perspective view of the lens driving device 101 with the upper leaf spring 16 further removed, and the lower view of FIG. 3 is an upper perspective view of the lens driving device 101 with the yoke 4 further removed. FIG. 4 is an upper perspective view of the lens holding member 2, and FIG. 5 is a lower perspective view of the lens holding member 2. Specifically, the upper view of FIG. 4 and the upper view of FIG. 5 are views of the lens holding member 2 without the coil 3 wound, and the lower view of FIG. 4 and the lower view of FIG. 5 are views of the lens holding member 2 with the coil 3 wound. FIG. 6 is a bottom view of the lens holding member 2 in a state where a part of the components is removed. Specifically, the upper view of FIG. 6 is a bottom view of the lens driving device 101 with the metal member 7 and the base member 18 removed, and the lower view of FIG. 6 is a bottom view of the lens driving device 101 with the lower leaf spring 26 and the lens holding member 2 further removed.

[0015] In the illustrated example, the lens holding member 2 is manufactured by injection molding a synthetic resin such as liquid crystal polymer (LCP). Specifically, as shown in FIG. 4, the lens holding member 2 includes a cylindrical portion 12 formed to have an opening 12k which is a through hole along the optical axis direction, and a flange portion 52 formed at an end on the imaging element side (Z2 side) in the optical axis direction. The cylindrical portion 12 is formed to be substantially cylindrical at the end on the subject side (Z1 side) in the optical axis direction.

[0016] The lens body is configured to be fixed inside the cylindrical portion 12 using an adhesive. A spiral groove may be provided on the inner peripheral surface of the cylindrical portion 12. This is to increase the adhesive strength between the lens body and the cylindrical portion 12. Further, four pedestal portions 12d having depressions 12dh are provided so as to surround the optical axis OA at the end face on the subject side of the cylindrical portion 12. As shown in FIG. 3, the inner portion 16i of the upper leaf spring 16 is placed on the pedestal portion 12d.

[0017] On the outer peripheral surface of the cylindrical portion 12, as shown in the upper figure of Fig. 4, a coil support portion 12j is provided as an outer peripheral wall portion that supports the coil 3 from the inside. In the present embodiment, the coil support portion 12j is formed in an octagonal ring shape so as to support the octagonal ring-shaped coil 3. And on the subject side of the coil support portion 12j, a regulating portion 12h that protrudes radially outward is formed so as to face the flange portion 52 in the optical axis direction. And as shown in the lower figure of Fig. 4, the coil 3 is wound around the outer peripheral surface of the lens holding member 2 in an octagonal ring shape so as to be supported by the coil support portion 12j and sandwiched between the regulating portion 12h and the flange portion 52 in the optical axis direction. In the illustrated example, the coil 3 is held by the lens holding member 2 without using an adhesive, but it may be fixed to the lens holding member 2 using an adhesive.

[0018] As described above, the flange portion 52 protrudes radially outward from the outer peripheral surface at the end portion on the imaging element side (Z2 side) of the cylindrical portion 12. And the coil 3 is disposed on the subject side (Z1 side) of the flange portion 52. As shown in the lower figure of Fig. 5, two notch portions 52k are formed in the flange portion 52 with the optical axis OA of the lens body interposed therebetween. And an extending portion 33 which is a part of the conductive wire (conductive line) constituting the coil 3 is passed through the notch portion 52k. Specifically, the left extending portion 33L which is the wire portion on the winding start side of the coil 3 is passed through the left notch portion 52kL which is one of the notch portions 52k, and the right extending portion 33R which is the wire portion on the winding end side of the coil 3 is passed through the right notch portion 52kR which is the other of the notch portions 52k.

[0019] As shown in the upper figure of Fig. 5, the flange portion 52 includes two holding portions 72 as angular convex projecting portions that project downward (in the Z2 direction) from the surface on the imaging element side (Z2 side), six projecting portions 2p as round convex projecting portions, and two abutting portions 2q as round convex projecting portions. Note that at least one of the projecting portions 2p and the abutting portions 2q may be angular convex.

[0020] As shown in the lower diagram of FIG. 5, the holding part 72 includes a left holding part 72L corresponding to the start side of winding of the coil 3 (winding part 13), and a right holding part 72R corresponding to the end side of winding of the coil 3 (winding part 13). The left extending part 33L is wound around and held by the left holding part 72L, and the right extending part 33R is wound around and held by the right holding part 72R.

[0021] As shown in the upper diagrams of FIGS. 5 and 6, the protruding part 2p includes three protruding parts 2p corresponding to the lower left side plate spring 26L and three protruding parts 2p corresponding to the lower right side plate spring 26R. An inner part 26i as a movable side support part of the lower side plate spring 26 is positioned and fixed to the protruding part 2p. The protruding part 2p is inserted into a round hole 26k as a through hole formed in the inner part 26i (inner joint part 26c) of the lower side plate spring 26. Note that the through hole may be a hole other than a round hole such as a square hole or an elliptical hole, or a notch, as long as it corresponds to the shape of the protruding part 2p.

[0022] Next, the drive part DM of the lens drive device 101 will be described. As shown in the lower diagram of FIG. 6, the drive part DM includes a coil 3, a yoke 4, and four magnets 5 arranged so as to face each of the four corners of the yoke 4. Then, the drive part DM generates a driving force (thrust force) with the current flowing through the coil 3 and the magnetic field generated by the magnets 5, and can move the lens holding member 2 up and down along the optical axis direction.

[0023] As shown in the lower diagram of FIG. 5, the coil 3 is formed by winding a conducting wire around the outer periphery of the lens holding member 2. The coil 3 includes a winding part 13 as a coil main body part formed by being wound in an octagonal ring shape, and an extending part 33 extending from the winding part 13 and wound around the holding part 72.

[0024] The extending part 33 includes a left extending part 33L connected to an end part (starting part 13S) of the winding part 13 located on the inner peripheral side of the winding part 13 at the start side of winding of the coil 3 (winding part 13), and a right extending part 33R connected to an end part (ending part 13E) of the winding part 13 located on the outer peripheral side of the winding part 13 at the end side of winding of the coil 3 (winding part 13).

[0025] Specifically, as shown in the lower diagram of FIG. 5, the left extending portion 33L includes a winding portion 33m wound around the left holding portion 72L, a connecting portion 33c extending to face the surface of the flange portion 52 on the imaging element side (Z2 side), and an insertion portion 33k inserted through the left notch portion 52kL and extending from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side). Similarly, the right extending portion 33R includes a winding portion 33m wound around the right holding portion 72R, a connecting portion 33c extending to face the surface of the flange portion 52 on the imaging element side (Z2 side), and an insertion portion 33k inserted through the right notch portion 52kR and extending from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side).

[0026] In the illustrated example, the left extending portion 33L is wound around the left holding portion 72L of the lens holding member 2 before the conducting wire forming 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 illustrated example, a part of the conducting wire, the left extending portion 33L, is wound around the left holding portion 72L four turns. Thereby, the winding portion 33m is formed on the left holding portion 72L, and a part of the left extending portion 33L is held by the left holding portion 72L. However, the left extending portion 33L may be wound around the left holding portion 72L after the conducting wire is wound around the outer periphery of the lens holding member 2, that is, after the winding portion 13 is formed.

[0027] After the left extending portion 33L is wound around the left holding portion 72L, the conducting wire is wound around the outer periphery of the lens holding member 2. At that time, the conducting wire extending from the winding portion 33m extends to face the bottom surface of the flange portion 52, and extends from the lower side of the flange portion 52 through the left notch portion 52kL to the upper side of the flange portion 52. At this time, the portion facing the bottom surface of the flange portion 52 constitutes the connecting portion 33c of the left extending portion 33L, and the portion passing through the left notch portion 52kL constitutes the insertion portion 33k of the left extending portion 33L. Note that the portion located between the winding portion 33m and the insertion portion 33k and not facing the flange portion 52 also constitutes the connecting portion 33c of the left extending portion 33L.

[0028] As shown in the lower diagram of FIG. 4, 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 lens holding member 2. Further, the winding portion 13 is fixed to the subject side of the flange portion 52 so as to be sandwiched between the restricting portion 12h and the flange portion 52 while being supported from the inside by the coil support portion 12j (see the upper diagram of FIG. 4). Further, since the inner peripheral surface of the winding portion 13 is isotropically and evenly 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 and the central axis of the lens holding member 2 coincide. Therefore, the lens driving device 101 is configured such that the optical axis OA of the lens body held by the lens holding member 2 easily coincides with the respective central axes of the lens holding member 2 and the coil 3.

[0029] When the winding of the conducting wire around the outer periphery of the lens holding member 2 is completed, as shown in the lower diagram of FIG. 5, the right extending portion 33R connected to the end portion on the winding end side of the winding portion 13 is drawn out from the subject side of the flange portion 52 to the imaging element side of the flange portion 52 through the right notch portion 52kR. Specifically, the insertion portion 33k passes through the right notch portion 52kR, and the winding portion 33m is wound around the right holding portion 72R of the lens holding member 2. In the illustrated example, the right extending portion 33R is wound around the right holding portion 72R four times. The portion located between the insertion portion 33k and the winding portion 33m of the right extending portion 33R constitutes the connection portion 33c of the right extending portion 33R.

[0030] Next, the yoke 4 that constitutes the drive unit DM will be described. In the present embodiment, the yoke 4 is manufactured by performing punching, drawing, and other processes 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-shaped outer shape that defines a storage portion 4s. And, as shown in FIG. 2, the yoke 4 has a rectangular cylindrical outer wall portion 4A and a flat plate-shaped upper surface portion 4B provided so as to be continuous with the upper end (the end on the Z1 side) of the outer wall portion 4A. The yoke 4 configured in this way is accommodated in the storage portion 4s so as to sandwich the magnet 5 between the outer wall portion 4A and the coil 3, as shown in the lower diagram of FIG. 6, and is coupled to the base member 18 and constitutes the housing HS together with the base member 18, as shown in the upper diagram of FIG. 3. However, the yoke 4 may be replaced with a cover member made of a non-magnetic material such as austenitic stainless steel.

[0031] Next, the magnet 5 that constitutes the drive unit DM will be described. As shown in FIG. 2, the magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface. And, as shown in the lower diagram of FIG. 6, the four magnets 5 are located outside the coil 3 and are arranged so as to face the respective four corners of the rectangular cylindrical outer wall portion 4A that constitutes the yoke 4. And the magnet 5 is fixed to the inner surface of the yoke 4 with an adhesive. Further, the magnet 5 is arranged such that, for example, the inner side (the side facing the optical axis OA) is the N pole and the outer side is the S pole, or the inner side is the S pole and the outer side is the N pole.

[0032] Next, the leaf spring 6 and the fixed-side member FB will be described. FIG. 7 is a diagram for explaining an example of the connection structure of three members (the leaf spring holding member 1, the yoke 4, and the upper leaf spring 16). Specifically, the upper diagram of FIG. 7 is a bottom perspective view of the leaf spring holding member 1. The central diagram of FIG. 7 is a bottom perspective view of the leaf spring holding member 1 and the upper leaf spring 16. The lower diagram of FIG. 7 is a bottom perspective view of the leaf spring holding member 1, the yoke 4, and the upper leaf spring 16. FIGS. 8 and 9 are diagrams for explaining an example of the connection structure between the lower right leaf spring 26R and the coil 3 (the right extending portion 33R). Specifically, FIG. 8 is an enlarged view of the range R1 shown in the upper diagram of FIG. 6, and FIG. 9 is an enlarged view of the lower right leaf spring 26R, the coil 3, and the lens holding member 2 when the range R1 is viewed from the Y2 side. In FIGS. 8 and 9, the solder SD that joins the coil 3 and the lower right leaf spring 26R is shown by cross-hatching. Also, for easier understanding of the explanation, in FIG. 8, the lower right leaf spring 26R is represented by a dashed line, and in FIG. 9, the illustration of the yoke 4 is omitted. FIG. 10 is a diagram for explaining the base member 18 as the fixed-side member FB. Specifically, the upper diagram of FIG. 10 is an upper perspective view of the base member 18, the central diagram of FIG. 10 is an upper perspective view of the metal member 7, and the lower diagram of FIG. 10 is an upper perspective view of the base member 18 in which the metal member 7 is embedded.

[0033] In this embodiment, the leaf spring 6 is made of a metal plate mainly made of a copper alloy. The leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the yoke 4 as shown in the upper diagram of FIG. 3, and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18 as shown in the upper diagram of FIG. 6. With each of the lens holding member 2 and the leaf spring 6 (the upper leaf spring 16, the lower left leaf spring 26L, and the lower right leaf spring 26R) connected, the leaf 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 leaf spring 26 (the lower left leaf spring 26L and the lower right leaf spring 26R) also functions as a power supply member for supplying current to the coil 3. Therefore, the lower left leaf spring 26L is electrically connected to one end of the coil 3, and the lower right leaf spring 26R is electrically connected to the other end of the coil 3.

[0034] As shown in the upper figure of Fig. 3, the upper plate spring 16 has a substantially rectangular shape in a top view, 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 FB (plate spring holding member 1 and yoke 4), and four elastic arm portions 16g positioned between the inner portion 16i and the outer portion 16e. Specifically, the inner portion 16i is provided in an annular shape so as to surround the optical axis OA. The outer portion 16e has four corner portions 16b and four cross portions 16r connecting two adjacent ones of the four corner portions 16b.

[0035] In the illustrated example, the upper plate spring 16 is formed to be substantially bilaterally symmetric, and is configured to be 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 16e. Therefore, the upper plate spring 16 can support the lens holding member 2 in a well-balanced manner.

[0036] When the upper plate spring 16 is attached to the lens driving device 101, as shown in the upper figure of Fig. 3, the inner portion 16i is placed on the pedestal portion 12d (see the central figure of Fig. 3) of the lens holding member 2. Then, the inner portion 16i and the pedestal portion 12d are joined 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 with an adhesive.

[0037] 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 the upper figure of Fig. 7, the plate spring holding member 1 has a substantially rectangular annular shape, four corner portions 1c (first corner portion 1c1 to fourth corner portion 1c4), projections 1p (first projection 1p1 to fourth projection 1p4) protruding downward (Z2 direction) from each of the four corner portions 1c, and a recess 1r formed inside the bottom surface (the surface on the Z2 side).

[0038] The protruding portion 1p is inserted into a round hole 16k (see the upper figure in Fig. 3), which is a through-hole formed in the corner portion 16b of the upper leaf spring 16, and is also inserted into round holes 4k (see the middle figure in Fig. 3), which are through-holes formed in each of the four corner portions of the upper surface portion 4B constituting the yoke 4.

[0039] More specifically, the protruding portion 1p in the leaf spring holding member 1 includes first to fourth protruding portions 1p1 to 1p4 as shown in the upper figure of Fig. 7. The round holes 4k formed in the yoke 4 include first to fourth round holes 4k1 to 4k4 as shown in the middle figure of Fig. 3. The round holes 16k formed in the upper leaf spring 16 include first to fourth round holes 16k1 to 16k4 as shown in the upper figure of Fig. 3. Then, as shown in the middle figure of Fig. 7, the first protruding portion 1p1 is inserted into the first round hole 16k1 formed in the upper leaf spring 16, the second protruding portion 1p2 is inserted into the second round hole 16k2, the third protruding portion 1p3 is inserted into the third round hole 16k3, and the fourth protruding portion 1p4 is inserted into the fourth round hole 16k4. Further, as shown in the lower figure of Fig. 7, the first protruding portion 1p1 is inserted into the first round hole 4k1 formed in the upper surface portion 4B of the yoke 4, the second protruding portion 1p2 is inserted into the second round hole 4k2, the third protruding portion 1p3 is inserted into the third round hole 4k3, and the fourth protruding portion 1p4 is inserted into the fourth round hole 4k4.

[0040] Thereafter, caulking is performed on the protruding portion 1p. In Fig. 7, the protruding portion 1p is shown in a state where the tip is deformed after caulking. Note that cold caulking may be performed on the protruding portion 1p.

[0041] In this way, the outer portion 16e of the upper leaf spring 16 is sandwiched and fixed between the leaf spring holding member 1 and the upper surface portion 4B of the yoke 4. In the illustrated example, an adhesive is applied between the corner portion 1c of the leaf spring holding member 1 and the corner portion 16b of the outer portion 16e, and between the corner portion of the upper surface portion 4B and the corner portion 16b of the outer portion 16e.

[0042] The recess 1r of the leaf spring holding member 1 is configured to allow elastic deformation of the elastic arm portion 16g that constitutes the upper leaf spring 16. In the illustrated example, when no current is flowing through the coil 3, the lens holding member 2 is not floating in the air, but is biased toward the imaging element side (Z2 side) by the leaf spring 6 and is in contact with the upper surface (the surface on the Z1 side) of the base member 18 via the contact portion 2q. When current flows through the coil 3, the lens holding member 2 is moved toward the subject side (Z1 side) by the electromagnetic force and is held in the air away from the base member 18. At this time, in the elastic arm portion 16g of the upper leaf spring 16, the portion in contact with the inner portion 16i is displaced upward (in the Z1 direction). The recess 1r of the leaf spring holding member 1 is formed to allow this displacement.

[0043] As shown in the upper figure of FIG. 3, the lens holding member 2 has its upper end protruding above (in the Z1 direction) the upper surface portion 4B of the yoke 4 even when no current is flowing through the coil 3. Therefore, the recess 1r of the leaf spring holding member 1 is formed to allow not only the displacement of the elastic arm portion 16g but also further protrusion of the lens holding member 2 when current flows through the coil 3.

[0044] As shown in the upper figure of FIG. 6, the lower left leaf spring 26L and the lower right leaf spring 26R are formed substantially symmetrically with respect to each other, and the shape of the inner portion (the side facing the optical axis OA) of each of them is configured to be substantially semi-circular. Each of the lower left leaf spring 26L and the lower right leaf spring 26R includes an inner portion 26i as a movable-side support portion fixed to the lens holding member 2, an outer portion 26e as a fixed-side support portion fixed to the fixed-side member FB (base member 18), and two elastic arm portions 26g located between the inner portion 26i and the outer portion 26e.

[0045] As shown in the upper figure of FIG. 6, each inner portion 26i of the lower left leaf spring 26L and the lower right leaf spring 26R includes three inner joining portions 26c joined to the lens holding member 2 and a connection plate portion 26h facing the extending portion 33 of the coil 3.

[0046] When the left lower side plate spring 26L and the right lower side plate spring 26R are attached to the lens holding member 2, each of the six protruding portions 2p of the lens holding member 2 shown in the upper figure of FIG. 5 is inserted into a round hole 26k as a through hole provided in each inner joint portion 26c of the left lower side plate spring 26L and the right lower side plate spring 26R shown in the upper figure of FIG. 6. The round hole 26k as the through hole may be a notch. Thereby, the inner portions 26i of the left lower side plate spring 26L and the right lower side plate spring 26R are positioned and fixed to the lens holding member 2. The left lower side plate spring 26L and the right lower side plate spring 26R are fixed to the lens holding member 2, for example, by applying thermal caulking or cold caulking to the protruding portion 2p of the lens holding member 2.

[0047] As shown in FIGS. 8 and 9, the connection plate portion 26h of the inner portion 26i constituting the right lower side plate spring 26R faces the surface of the lens holding member 2 on the imaging element side (Z2 side) when the right lower side plate spring 26R is attached to the lens holding member 2. That is, the surface of the connection plate portion 26h on the subject side (Z1 side) faces the surface of the flange-shaped portion 52 constituting the lens holding member 2 on the imaging element side (Z2 side). And as shown in FIG. 9, the connection portion 33c of the right extending portion 33R constituting the coil 3 extends between the surface of the inner portion 26i of the right lower side plate spring 26R on the subject side (Z1 side) and the surface of the flange-shaped portion 52 of the lens holding member 2 on the imaging element side (Z2 side).

[0048] When the right lower side plate spring 26R is attached to the lens holding member 2, as shown in FIG. 9, the right holding portion 72R protrudes downward (Z2 direction) from the inner portion 26i so that the tip thereof is located on the imaging element side (Z2 side) rather than the inner portion 26i of the right lower side plate spring 26R. Also, a part of the winding portion 33m is wound around the right holding portion 72R so as to be located on the imaging element side (Z2 side) rather than the inner portion 26i.

[0049] The lower right side plate spring 26R and the right extending portion 33R (wrapping portion 33m) of the coil 3 are electrically and mechanically connected by solder SD. Specifically, as shown in the upper diagram of FIG. 6, the lower right side plate spring 26R is attached to the lens holding member 2 such that the round hole 26k formed in the inner joint portion 26c fits with the protruding portion 2p of the lens holding member 2. Then, the protruding portion 2p of the lens holding member 2 is thermally caulked, and the solder paste applied to the connection plate portion 26h is heated by laser light. However, the lower right side plate spring 26R and the right extending portion 33R of the coil 3 may be electrically and mechanically connected by a conductive adhesive in which conductive fillers such as silver particles are dispersed in a synthetic resin. Note that the above description with reference to FIGS. 8 and 9 is similarly applicable to the connection between the lower left side plate spring 26L, the lens holding member 2, and the coil 3.

[0050] As shown in the upper diagram of FIG. 6, the outer portion 26e of the lower left side plate spring 26L includes two outer joint portions 26d joined to the base member 18. Similarly, the outer portion 26e of the lower right side plate spring 26R includes two outer joint portions 26d joined to the base member 18.

[0051] The base member 18 is manufactured by injection molding using a 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, and a circular opening 18k is formed in the center. Further, on the surface of the base member 18 on the subject side (Z1 side), four protruding portions 18t protruding upward are provided. The protruding portions 18t are inserted and fitted into through holes 26t (see the upper diagram of FIG. 6) provided in the outer joint portions 26d of each of the lower left side plate spring 26L and the lower right side plate spring 26R. At this time, the protruding portions 18t are thermally caulked and fixed to the outer joint portions 26d. In FIG. 10, the protruding portions 18t are illustrated in a state where the tips are deformed after being thermally caulked. Note that the protruding portions 18t may be fixed to the outer joint portions 26d by cold caulking.

[0052] As shown in Fig. 10, a metal member 7 formed from a metal plate containing a material such as copper, iron, or an alloy mainly composed of these is insert-molded and embedded in the base member 18.

[0053] The metal member 7 includes a first metal member 7A to a third metal member 7C. The first metal member 7A has a connection portion 7AC that is exposed from the upper surface (the surface on the Z1 side) of the base member 18, and the second metal member 7B has a connection portion 7BC that is exposed from the upper surface (the surface on the Z1 side) of the base member 18. The surfaces of the connection portion 7AC and the connection portion 7BC are located on the same plane.

[0054] The connection portion 7AC is connected to the outer joint portion 26d of the lower right side plate spring 26R via a conductive bonding material in a state of facing a through hole 26dt (see the upper figure in Fig. 6) formed in the outer joint portion 26d of the lower right side plate spring 26R. The conductive bonding material is, for example, solder or a conductive adhesive, etc. In this embodiment, the conductive bonding material is a conductive adhesive.

[0055] Similarly, the connection portion 7BC is connected to the outer joint portion 26d of the lower left side plate spring 26L via a conductive bonding material in a state of facing a through hole 26dt (see the upper figure in Fig. 6) formed in the outer joint portion 26d of the lower left side plate spring 26L.

[0056] Further, the first metal member 7A has a terminal portion 7AT that protrudes downward from the bottom surface (the surface on the Z2 side) of the base member 18, and the second metal member 7B has a terminal portion 7BT that protrudes downward from the bottom surface (the surface on the Z2 side) of the base member 18.

[0057] The third metal member 7C has end portions 7C1 to 7C4 that protrude outward in a direction perpendicular to the optical axis direction from the corner portions of the base member 18. As shown in Fig. 1, each of the end portions 7C1 to 7C4 is configured to contact the lower end portions at the four corners of the yoke 4.

[0058] After the inner surface of the outer wall portion 4A of the yoke 4 and the outer peripheral side surface of the base member 18 are combined and positioned, each of the end portions 7C1 to 7C4 and the lower end portions of the four corners of the yoke 4 are welded and fixed to the yoke 4. The yoke 4 and the base member 18 may be fixed with an adhesive at least partially.

[0059] Next, with reference to FIGS. 11 to 17, the positional relationship between the lens holding member 2 and the coil 3 will be described. FIGS. 11 to 15 are views of the lens holding member 2 as seen from a direction perpendicular to the optical axis direction. Specifically, the upper view of FIG. 11 is a left side view of the lens holding member 2X as a comparative example, and the lower view of FIG. 11 is a left side view of the lens holding member 2. FIG. 11 shows a state when only the innermost layer (first layer WL1) of the six winding layers WL constituting the winding portion 13 of the coil 3 is wound. The upper view of FIG. 12 is a right side view of the lens holding member 2X as a comparative example, and the lower view of FIG. 12 is a right side view of the lens holding member 2. FIG. 12 shows a state when all of the winding portion 13 of the coil 3 is wound. The upper view of FIG. 13 is a front view of the lens holding member 2. The lower view of FIG. 13 is a cross-sectional view of the lens holding member 2 around which the coil 3 is wound, and shows a cross-section of the lens holding member 2 and the coil 3 as seen from the X1 side in a virtual plane parallel to the YZ plane including the cutting line CL1 in the lower view of FIG. 4. The upper view of FIG. 14 is a right side view of the lens holding member 2. The lower view of FIG. 14 is a cross-sectional view of the lens holding member 2 around which the coil 3 is wound, and shows a cross-section of the lens holding member 2 and the coil 3 as seen from the Y2 side in a virtual plane parallel to the XZ plane including the cutting line CL2 in the lower view of FIG. 4. The upper view of FIG. 15 is a rear view of the lens holding member 2, and the lower view of FIG. 15 is a left side view of the lens holding member 2. FIGS. 16 and 17 are cross-sectional views of the lens holding member 2 and the coil 3. Specifically, the left view of FIG. 16 is an enlarged view of the range R2 surrounded by the broken line in the lower view of FIG. 13, and the right view of FIG. 16 is an enlarged view of the range R3 surrounded by the broken line in the lower view of FIG. 13. Also, the left view of FIG. 17 is an enlarged view of the range R4 surrounded by the broken line in the lower view of FIG. 14, and the right view of FIG. 17 is an enlarged view of the range R5 surrounded by the broken line in the lower view of FIG. 14. In FIGS. 16 and 17, for clarity, the cross-sectional pattern (hatched pattern) is attached only to the cross-section of the wire material constituting the coil 3.

[0060] The conductive wire (wire material) that constitutes the coil 3 has a conductive metal wire and an insulating coating layer that coats the metal wire. The coating layer has a two-layer structure having an insulating layer that coats the metal wire and a fusion layer disposed around the insulating layer. In FIGS. 11 to 17, the coating layer is omitted from illustration for clarity. And when the coil 3 is wound around the outer periphery of the lens holding member 2, the two wire material annular portions WA adjacent to each other have their respective fusion layers thermally fused to each other.

[0061] In the upper diagram of FIG. 11, only the innermost layer (the first layer WL1) of the six winding layers WL that constitute the winding portion 13 of the coil 3 is wound around the lens holding member 2X as a comparative example. The first layer WL1 includes a 9-turn wire material annular portion WA (the first wire material annular portions WA11 to WA19).

[0062] The first wire material annular portion WA11 extends parallel to the XY plane from the starting point WA11S, which is also the starting portion 13S of the winding portion 13, to the intermediate point WA11M, and then extends obliquely upward to the end point WA11E, where it is connected to the starting point WA12S of the second wire material annular portion WA12. In the upper diagram of FIG. 11, the obliquely extending portion of the first wire material annular portion WA11 is referred to as the inclined portion TD. The same applies to the second wire material annular portion WA12 to the eighth wire material annular portion WA18.

[0063] The ninth wire material annular portion WA19 extends parallel to the XY plane from the starting point WA19S to the intermediate point WA19M, and then rides on the inclined portion TD of the eighth wire material annular portion WA18 and is overlapped outside the inclined portion TD of the eighth wire material annular portion WA18. At the end point WA19E, it is connected to the starting point of the first wire material annular portion WA21 of the second layer WL2 (not shown in the upper diagram of FIG. 11).

[0064] Since the first layer WL1 is wound around the outer peripheral surface of the lens holding member 2X in this way, as shown in the upper diagram of FIG. 12, the eighth wire annular portion WA68, which is the last wire annular portion WA in the outermost layer (the sixth layer WL6), is shorter by half a turn than the other wire annular portions WA (the first wire annular portion WA61 to the seventh wire annular portion WA67) in the outermost layer (the sixth layer WL6). Specifically, as shown in the upper diagram of FIG. 12, when the end point WA68E, which is also the end portion 13E of the winding portion 13 of the eighth wire annular portion WA68, reaches the right notch portion 52kR, it is drawn out from the subject side (Z1 side) of the flange portion 52 through the right notch portion 52kR to the imaging element side (Z2 side) of the flange portion 52.

[0065] In such a configuration, the number of turns (the number of wire annular portions WA) of the outermost layer, the sixth layer WL6, is reduced by half a turn due to the eighth wire annular portion WA68. And when the number of wire annular portions WA in the outermost layer closest to the magnet 5 decreases, the thrust generated by the drive unit DM decreases. Also, a difference occurs in the thrust generated by the drive unit DM between the X1 side (the side where the half-turn eighth wire annular portion WA68 exists) and the X2 side (the side where there is no half-turn wire annular portion), causing the balance to be disrupted.

[0066] Therefore, as shown in the lower diagram of FIG. 11, the lens holding member 2 according to the embodiment of the present disclosure has a protruding portion PT corresponding to a half-turn wire on the outer peripheral surface EF of the coil support portion 12j, which is the portion around which the wire is wound, and is configured such that the number of turns (the number of wire annular portions WA) of the outermost layer does not decrease. In FIGS. 11, 13, 14, and 15, for clarity, a dot pattern is attached to the surface of the protruding portion PT. Also, in FIGS. 16 and 17, for clarity, a cross pattern is attached to the cross section of the protruding portion PT.

[0067] Specifically, in the lower diagram of FIG. 11, only the innermost layer (the first layer WL1) of the six winding layers WL that constitute the winding portion 13 of the coil 3 is wound around the lens holding member 2, similar to the case of the lens holding member 2X as a comparative example. The first layer WL1 includes a nine-turn wire annular portion WA (the first wire annular portion WA11 to the ninth wire annular portion WA19).

[0068] The first wire annular portion WA11 extends approximately half a circumference parallel to the XY plane from the starting point WA11S, which is also the starting portion 13S of the winding portion 13, then rides on the height adjustment portion HA (see the upper diagram of FIG. 14) of the protruding portion PT and is overlapped on the upper side of the height adjustment portion HA, and then extends along the first protruding portion PT1 of the protruding portion PT parallel to the XY plane, and is connected to the starting point WA12S of the second wire annular portion WA12 at the end point WA11E. The same applies to the second wire annular portion WA12 to the ninth wire annular portion WA19.

[0069] As shown in the lower diagram of FIG. 13, the left extending portion 33L wound around the left holding portion 72L extends along the inclined surface 2T (left inclined surface 2TL) of the lens holding member 2 and is connected to the starting point WA11S of the first wire annular portion WA11 of the first layer WL1. Also, as shown in the lower diagram of FIG. 13, the right extending portion 33R wound around the right holding portion 72R extends along the inclined surface 2T (right inclined surface 2TR) of the lens holding member 2 and is connected to the end point WA68E of the eighth wire annular portion WA68 of the sixth layer WL6.

[0070] As shown in the lower diagram of FIG. 15, a concave portion 12U is formed in the portion of the coil support portion 12j corresponding to the starting portion 13S of the winding portion 13. In FIG. 15, for clarity, a cross pattern is attached to the concave portion 12U. The concave portion 12U is a structure for aligning the radial positions of the first wire annular portion WA11 in the first layer WL1 and the other wire annular portions WA (the second wire annular portion WA12 to the ninth wire annular portion WA19) in the first layer WL1, as shown in FIG. 16.

[0071] Since the first layer WL1 is wound around the outer peripheral surface EF of the coil support portion 12j in this manner, in the lens holding member 2, as shown in the lower diagram of FIG. 12, the eighth wire annular portion WA68, which is the last wire annular portion WA in the outermost layer (the sixth layer WL6), has the same length as the other wire annular portions WA (the first wire annular portion WA61 to the seventh wire annular portion WA67) in the outermost layer (the sixth layer WL6). Specifically, in the eighth wire annular portion WA68, both the starting point WA68S and the ending point WA68E are on the right notch portion 52kR. When the ending point WA68E reaches the right notch portion 52kR, it is drawn from the subject side (Z1 side) of the flange portion 52 through the right notch portion 52kR to the imaging element side (Z2 side) of the flange portion 52.

[0072] In such a configuration, unlike the case of the lens holding member 2X, the number of turns (the number of wire annular portions WA) of the outermost layer, the sixth layer WL6, does not decrease by half a turn of the eighth wire annular portion WA68. Therefore, it is possible to suppress a decrease in the thrust generated by the drive unit DM, and it is also possible to suppress a difference in the thrust generated by the drive unit DM between the X1 side and the X2 side, which would cause the balance to be disrupted.

[0073] More specifically, as shown in FIG. 16, the winding portion 13 of the coil 3 has six winding layers WL. The six winding layers WL include the first layer WL1 to the sixth layer WL6. The first layer WL1 includes nine turns of wire annular portions WA (the first wire annular portion WA11 to the ninth wire annular portion WA19), the second layer WL2 includes eight turns of wire annular portions WA (the first wire annular portion WA21 to the eighth wire annular portion WA28), the third layer WL3 includes nine turns of wire annular portions WA (the first wire annular portion WA31 to the ninth wire annular portion WA39), the fourth layer WL4 includes eight turns of wire annular portions WA (the first wire annular portion WA41 to the eighth wire annular portion WA48), the fifth layer WL5 includes nine turns of wire annular portions WA (the first wire annular portion WA51 to the ninth wire annular portion WA59), and the sixth layer WL6 includes eight turns of wire annular portions WA (the first wire annular portion WA61 to the eighth wire annular portion WA68). That is, the winding portion 13 includes 51 turns of wire annular portions WA.

[0074] The protruding part PT includes a height adjustment part HA and a first protruding part PT1. As shown in the upper figure of FIG. 14, the height adjustment part HA is a part that gradually becomes higher in the Z-axis direction over the width WD along the X-axis direction. The first protruding part PT1 is a part that extends parallel to the XY plane and whose height in the Z-axis direction does not change. In the illustrated example, the first protruding part PT1 is higher than the upper surface of the flange part 52 by the thickness DS1 (see FIG. 17) which is the diameter of the wire.

[0075] This configuration can suppress a decrease in the thrust generated by the drive part DM by avoiding a reduction in the number of the outermost wire annular parts WA closest to the magnet 5 by half a turn.

[0076] Next, referring to FIGS. 18 to 22, another configuration example of the lens holding member 2, namely the lens holding member 2A, will be described. FIGS. 18 to 22 are views of the lens holding member 2A seen from a direction perpendicular to the optical axis direction. Specifically, the upper figure of FIG. 18 is a front view of the lens holding member 2A and corresponds to the upper figure of FIG. 13. The lower figure of FIG. 18 is a cross-sectional view of the lens holding member 2A around which the coil 3 is wound and corresponds to the lower figure of FIG. 13. The upper figure of FIG. 19 is a right side view of the lens holding member 2A and corresponds to the upper figure of FIG. 14. The lower figure of FIG. 19 is a cross-sectional view of the lens holding member 2A around which the coil 3 is wound and corresponds to the lower figure of FIG. 14. The upper figure of FIG. 20 is a rear view of the lens holding member 2A and corresponds to the upper figure of FIG. 15. The lower figure of FIG. 20 is a left side view of the lens holding member 2A and corresponds to the lower figure of FIG. 15. FIGS. 21 and 22 are cross-sectional views of the lens holding member 2A and the coil 3. FIG. 21 corresponds to FIG. 16, and FIG. 22 corresponds to FIG. 17. Specifically, the left figure of FIG. 21 is an enlarged view of the range R6 surrounded by the broken line in the lower figure of FIG. 18, and the right figure of FIG. 21 is an enlarged view of the range R7 surrounded by the broken line in the lower figure of FIG. 18. Also, the left figure of FIG. 22 is an enlarged view of the range R8 surrounded by the broken line in the lower figure of FIG. 19, and the right figure of FIG. 22 is an enlarged view of the range R9 surrounded by the broken line in the lower figure of FIG. 19. In FIGS. 21 and 22, for clarity, a cross-sectional pattern (hatched pattern) is attached to the cross-section of the wire constituting the coil 3.

[0077] In the lens holding member 2X shown in the upper diagram of FIG. 11 and the upper diagram of FIG. 12, when the number of turns of the winding portion 13 is reduced to adjust the resistance value of the wire of the coil 3, the number of turns of the outermost layer, the sixth layer WL6 (the number of wire annular portions WA), decreases. Further, when the number of wire annular portions WA in the outermost layer closest to the magnet 5 decreases, the decrease in the thrust generated by the drive unit DM becomes larger than when the number of wire annular portions WA forming the inner layer decreases.

[0078] Therefore, the lens holding member 2A shown in FIGS. 18 to 22 is configured such that a protruding portion PT is provided on the outer peripheral surface EF of the coil support portion 12j, which is a portion around which the wire is wound, so that the number of turns (the number of wire annular portions WA) of the innermost layer, the first layer WL1, can be reduced by two. In FIGS. 18 to 20, for clarity, a dot pattern is provided on the surface of the protruding portion PT. Further, in FIGS. 21 and 22, for clarity, a cross pattern is provided on the cross section of the protruding portion PT.

[0079] The lens holding member 2A is different from the lens holding member 2 in that the protruding portion PT includes a second protruding portion PT2, but is the same as the lens holding member 2 in other respects.

[0080] Similar to the first protruding portion PT1, the second protruding portion PT2 extends parallel to the XY plane and is a portion where the height in the Z-axis direction does not change. Further, as shown in FIG. 22, the second protruding portion PT2 is configured to be lower than the first protruding portion PT1 by the wire thickness DS1. Also, in the illustrated example, the second protruding portion PT2 is configured to have a height corresponding to twice the wire thickness DS1 so that the number of turns (the number of wire annular portions WA) of the innermost layer, the first layer WL1, can be reduced by two. Note that the second protruding portion PT2 may be configured to have a height of three times or more the wire thickness DS1 so that the number of turns (the number of wire annular portions WA) of the innermost layer, the first layer WL1, can be reduced by three or more.

[0081] This configuration can adjust the resistance value of the wire of the coil 3 while suppressing a decrease in the thrust generated by the drive unit DM by reducing the number of the innermost wire annular portions WA farthest from the magnet 5 instead of reducing the number of the outermost wire annular portions WA closest to the magnet 5, bringing about the effect that the resistance value of the wire of the coil 3 can be adjusted while suppressing a decrease in the thrust generated by the drive unit DM.

[0082] As described above, as shown in FIG. 2, the lens driving device 101 according to the present embodiment includes a fixed-side member FB, a lens holding member 2 having a cylindrical portion 12 capable of holding a lens body, a leaf spring 6 (an upper leaf spring 16 and a lower leaf spring 26) as a support member that supports the lens holding member 2 so as to be movable in the optical axis direction (Z-axis direction), a coil 3 provided at least outside the cylindrical portion 12 of the lens holding member 2, and a plurality (four) of magnets 5 facing the coil 3, and has a drive unit DM that moves the lens holding member 2 in the optical axis direction with respect to the fixed-side member FB. The lens holding member 2 has a flange-shaped portion 52 protruding radially outward from the outer peripheral surface EF of the cylindrical portion 12 and a restricting portion 12h facing the flange-shaped portion 52 with a gap therebetween in the optical axis direction. Two notches 52k (a left notch 52kL and a right notch 52kR) are formed in the flange-shaped portion 52 at positions facing each other with the cylindrical portion 12 interposed therebetween, and holding portions 72 are provided corresponding to the two notches 52k, respectively. The coil 3 includes a winding portion 13 formed by winding a wire around the outer periphery of the cylindrical portion 12 between one surface (the surface on the Z1 side) of the flange-shaped portion 52 and one surface (the surface on the Z2 side) of the restricting portion 12h, a first extending portion (a left extending portion 33L) connected to the start portion 13S of the winding portion 13, and a second extending portion (a right extending portion 33R) connected to the end portion 13E of the winding portion 13. The first extending portion (the left extending portion 33L) passes through the first notch (the left notch 52kL) and is held by the first holding portion (the left holding portion 72L), and the second extending portion (the right extending portion 33R) passes through the second notch (the right notch 52kR) and is held by the second holding portion (the right holding portion 72R).

[0083] As shown in FIGS. 16 and 17, the winding portion 13 has a plurality (six) of winding layers WL stacked radially outward from the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j). Then, as shown in FIG. 17, the first turn wire annular portion WA (first wire annular portion WA11) of the winding portion 13 connected to the first extending portion (left extending portion 33L) is in a direction along the outer peripheral surface EF of the cylindrical portion 12 (a direction parallel to the XY plane which is the direction in which the wire is wound). The second portion WP2, which is located between the second notch portion (right notch portion 52kR) and the first notch portion (left notch portion 52kL) and exists in the second region ZN2 different from the first region ZN1, is arranged to be positioned on the side (Z1 side) of the regulating portion 12h by approximately the same dimension as the wire thickness DS1. In the example shown in FIG. 17, the first turn wire annular portion WA (first wire annular portion WA11) of the winding portion 13 is wound around the second region ZN2 after being wound around the first region ZN1. That is, in the first turn wire annular portion WA (first wire annular portion WA11) of the winding portion 13, the first portion WP1 existing in the first region ZN1 is connected to the first extending portion (left extending portion 33L).

[0084] This configuration has the effect of making the number of wires constituting the outermost layer of the winding portion 13 the same over the entire circumference (360 degrees) of the cylindrical portion 12. Therefore, this configuration has the effect of suppressing the variation in the electromagnetic force generated by the coils 3 and the four magnets 5 in the circumferential direction of the cylindrical portion 12. That is, this configuration has the effect of suppressing the difference in electromagnetic force caused by the difference in the number of turns of the wire.

[0085] Further, as shown in FIG. 17, in the second region ZN2, a first protrusion PT1 is provided at a corner formed by one surface (the surface on the Z1 side) of the flange portion 52 and the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j). The first turn of the wire annular portion WA (the second portion WP2 of the first wire annular portion WA11) is disposed in contact with the surface on the side of the regulating portion 12h (the Z1 side) of the first protrusion PT1. Note that the protruding amount PX1 of the first protrusion PT1 radially outward from the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j) is substantially the same as the thickness DS1 of the wire.

[0086] This configuration provides an effect that the position (height in the Z-axis direction) of the first turn of the wire can be easily made different between the first region ZN1 and the second region ZN2 by the first protrusion PT1. Further, this configuration provides an effect that the second layer WL2, which is an adjacent layer located adjacent to the first layer WL1, which is the innermost layer of the winding portion 13, can be appropriately formed.

[0087] Further, as shown in FIG. 16, on the side (Z2 side) of the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j) where the flange portion 52 is located, at a portion corresponding to the second notch portion (right notch portion 52kR) (the portion where the second notch portion is formed), a height adjusting portion HA that contacts the first turn of the wire annular portion WA (the first wire annular portion WA11) is provided integrally with the cylindrical portion 12 (coil support portion 12j). That is, the height adjusting portion HA is provided on the side (Y2 side) corresponding to the second notch portion (right notch portion 52kR), rather than on the side (Y1 side) corresponding to the first notch portion (left notch portion 52kL), of the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j). Then, as is apparent from the upper diagram of FIG. 14, the height position in the optical axis direction (Z-axis direction) of the first turn of the wire annular portion WA (the first wire annular portion WA11) wound from the first region ZN1 toward the second region ZN2 gradually changes in the circumferential direction by the height adjusting portion HA. Note that in the illustrated example, the height adjusting portion HA is formed continuously with the first protrusion PT1, but it may be formed so as to be arranged with a gap therebetween.

[0088] This configuration can gradually change the height of the wire (the wire annular part WA) in the Z-axis direction, thus bringing about the effect of suppressing the occurrence of winding disorder in the winding part 13.

[0089] Also, as shown in FIG. 22, in the first region ZN1, a second protruding portion PT2 may be provided at a corner formed by one surface (the surface on the Z1 side) of the flange portion 52 and the outer peripheral surface EF of the cylindrical portion 12 (the coil support portion 12j). In this case, the first portion WP1 of the wire annular part WA of the first turn (the first wire annular part WA11) is arranged in contact with the surface on the side of the restricting portion 12h (the Z1 side) of the second protruding portion PT2. Note that the protruding amount PX2 of the second protruding portion PT2 radially outward from the outer peripheral surface EF of the cylindrical portion 12 (the coil support portion 12j) is substantially the same as the thickness DS1 of the wire. And the protruding amount PZ1 of the first protruding portion PT1 toward the side of the restricting portion 12h (the Z1 side) is larger than the protruding amount PZ2 of the second protruding portion PT2 toward the side of the restricting portion 12h (the Z1 side) by a dimension substantially the same as the thickness DS1 of the wire.

[0090] This configuration brings about the effect that the number of wires in the outermost layer (the sixth layer WL6) close to the magnet 5 can be increased by adjusting the protruding amounts of the first protruding portion PT1 and the second protruding portion PT2 in the optical axis direction.

[0091] Also, as shown in FIG. 22, the protruding amount PZ1 of the first protruding portion PT1 toward the side of the restricting portion 12h (the Z1 side) with respect to one surface (the surface on the Z1 side) of the flange portion 52 is desirably a natural number multiple of the thickness DS1 of the wire. The number of winding layers WL constituting the winding part 13 is an even number. The number of turns of the wire constituting the outermost layer of the winding part 13 is one less than the number of turns of the wire constituting the adjacent layer, which is the second layer from the outside adjacent to the outermost layer. The wires constituting the adjacent layer are arranged over the entire area between one surface (the surface on the Z1 side) of the flange portion 52 and the restricting portion 12h. The wires constituting the outermost layer are arranged such that each of the plurality of wire annular parts WA constituting the outermost layer is located between two adjacent wire annular parts WA in the optical axis direction constituting the adjacent layer.

[0092] In the example shown in FIG. 22, the protruding amount PZ1 of the regulating portion 12h of the first protruding portion PT1 toward the side (Z1 side) is three times the thickness DS1 of the wire, the number of winding layers WL constituting the winding portion 13 is six, and the number of turns (8 turns) of the wire constituting the outermost layer (the sixth layer) of the winding portion 13 is one less than the number of turns (9 turns) of the wire constituting the adjacent layer (the fifth layer), which is the second layer from the outside adjacent to the outermost layer. The wire constituting the adjacent layer (the fifth layer) is arranged without a gap over the entire area between the one surface (the surface on the Z1 side) of the flange portion 52 and the regulating portion 12h. The wire constituting the outermost layer (the sixth layer) is arranged such that each of the eight wire annular portions WA constituting the outermost layer (the sixth layer) is positioned between two adjacent wire annular portions WA in the optical axis direction (Z-axis direction) of the adjacent layer (the fifth layer). Specifically, the first wire annular portion WA61 constituting the outermost layer (the sixth layer) farthest from the cylindrical portion 12 is arranged to be positioned between the eighth wire annular portion WA58 and the ninth wire annular portion WA59 constituting the adjacent layer (the fifth layer) in the Z-axis direction.

[0093] This configuration results in an effect that the number of wires in the outermost layer (the sixth layer WL6) increases, and the thrust by the drive unit DM can be increased.

[0094] As described above, the preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments. Various modifications and substitutions can be applied to the above-described embodiments without departing from the scope of the present invention. Also, each of the features described with reference to the above embodiments may be appropriately combined as long as there is no technical contradiction.

[0095] For example, in the above-described embodiment, the base member 18 constitutes the fixed-side member FB, but it may also constitute a movable-side member that holds the magnet 5 (a magnet holding member in a lens drive device having an optical hand shake correction function).

Explanation of Reference Numerals

[0096] 1... leaf spring holding member 1c... corner 1c1... first corner 1c2... second corner 1c3... third corner 1c4... fourth corner 1p... protrusion 1p1... first protrusion 1p2... second protrusion 1p3... third protrusion 1p4... fourth protrusion 1r... recess 2, 2A, 2X... lens holding member 2p... protruding portion 2q... abutting portion 2T... inclined surface 2TL... left inclined surface 2TR... right inclined surface 3... coil 4... yoke 4A... outer wall portion 4B... upper surface portion 4k... round hole 4k1... first round hole 4k2... second round hole 4k3... third round hole 4k4... fourth round hole 4s... storage portion 5... magnet 6... leaf spring 7... metal member 7A... first metal member 7AT... terminal portion 7B... second metal member 7BT... terminal portion 7C... third metal member 7C1~7C4... end portions 12... cylindrical portion 12d... pedestal portion 12dh... depression 12h... regulating portion 12j... coil support portion 12k... opening 12U... recess 13... winding portion 13E... end of winding portion 13S... start of winding portion 16... upper leaf spring 16b... corner portion 16e... outer portion 16g... elastic arm portion 16i... inner portion 16k... round hole 16k1... first round hole 16k2... second round hole 16k3... third round hole 16k4... fourth round hole 16r... crossbar portion 18... base member 18k... opening 18t... protruding portion 26... lower leaf spring 26c... inner joint portion 26d... outer joint portion 26dt... through hole 26e... outer portion 26g... elastic arm portion 26h... connecting plate portion 26i... inner portion 26k... round hole 26L... lower left leaf spring 26R... lower right leaf spring 26t... through hole 33... extending portion 33c... connecting portion 33k... insertion portion 33L... left extending portion 33m... winding portion 33R... right extending portion 52... flange portion 52k... notch portion 52kL... left notch portion 52kR... right notch portion 72... holding portion 72L... left holding portion 72R... right holding portion 101... lens driving device AD... adhesive DM... driving portion EF... outer peripheral surface FB... fixed side member HA... height adjusting portion HS... housing OA... optical axis PT... protruding portionPT1 ··· The first protrusion PT2 ··· The second protrusion SD ··· Solder TD ··· Inclined part WA ··· Wire annular part WA11 ··· The first wire annular part WA11E ··· End point WA11M ··· Intermediate point WA11S ··· Starting point WA12 ··· The second wire annular part WA12S ··· Starting point WA13 ··· The third wire annular part WA14 ··· The fourth wire annular part WA15 ··· The fifth wire annular part WA16 ··· The sixth wire annular part WA17 ··· The seventh wire annular part WA18 ··· The eighth wire annular part WA18E ··· End point WA19 ··· The ninth wire annular part WA19M ··· Intermediate point WA19S ··· Starting point WA21 ··· The first wire annular part WA28 ··· The eighth wire annular part WA31 ··· The first wire annular part WA39 ··· The ninth wire annular part WA41 ··· The first wire annular part WA48 ··· The eighth wire annular part WA51 ··· The first wire annular part WA58 ··· The eighth wire annular part WA59 ··· The ninth wire annular part WA61 ··· The first wire annular part WA67 ··· The seventh wire annular part WA68 ··· The eighth wire annular part WA68E ··· End point WA68S ··· Starting point WL ··· Winding layer WL1 ··· The first layer WL2 ··· The second layer WL3 ··· The third layer WL4 ··· The fourth layer WL5 ··· The fifth layer WL6 ··· The sixth layer WP1 ··· The first part WP2 ··· The second part ZN1 ··· The first region ZN2 ··· The second region

Claims

1. A fixed side member, a lens holding member having a cylindrical portion capable of holding a lens body, a support member that supports the lens holding member so as to be movable in the optical axis direction, including a coil provided at least outside the cylindrical portion of the lens holding member and a plurality of magnets facing the coil, and a drive unit that moves the lens holding member in the optical axis direction, the lens holding member has a flange portion protruding radially outward from the outer peripheral surface of the cylindrical portion and a restricting portion facing the flange portion with a space therebetween in the optical axis direction, a first notch portion and a second notch portion are formed in the flange portion at positions facing each other with the cylindrical portion interposed therebetween, a first holding portion is provided corresponding to the first notch portion, and a second holding portion is provided corresponding to the second notch portion, the coil has a winding portion formed by winding a wire around the outer periphery of the cylindrical portion between one surface of the flange portion and the restricting portion, a first extending portion connected to the start portion of the winding of the winding portion, and a second extending portion connected to the end portion of the winding of the winding portion, in the lens driving device, the first extending portion passes through the first notch portion and is held by the first holding portion, and the second extending portion passes through the second notch portion and is held by the second holding portion, the winding portion has a plurality of winding layers stacked radially outward from the outer peripheral surface of the cylindrical portion, the first wire annular portion connected to the first extending portion is located in a second region that is located between the second notch portion and the first notch portion and is different from the first region, rather than a first portion existing in a first region located between the first notch portion and the second notch portion in the direction along the outer peripheral surface of the cylindrical portion, and is arranged to be positioned closer to the restricting portion side by approximately the same dimension as the thickness of the wire, A lens driving device characterized by the above.

2. In the second region, a first protruding portion is provided at a corner formed by the one surface of the flange portion and the outer peripheral surface of the cylindrical portion, the first wire annular portion is arranged in contact with the surface of the first protruding portion on the restricting portion side, the protruding amount of the first protruding portion radially outward from the outer peripheral surface of the cylindrical portion is substantially the same as the thickness of the wire, The lens driving device according to Claim 1.

3. At a position corresponding to the second notch portion, a height adjusting portion in contact with the first wire annular portion is provided integrally with the cylindrical portion, The height position in the optical axis direction of the first wound wire annular portion wound from the first region toward the second region gradually changes in the circumferential direction by the height adjustment portion. The lens driving device according to claim 2.

4. In the first region, a second protruding portion is provided at a corner formed by the one surface of the flange portion and the outer peripheral surface of the cylindrical portion. The first wound wire annular portion is disposed in contact with the surface on the restricting portion side of the second protruding portion. The amount of protrusion of the second protruding portion radially outward from the outer peripheral surface of the cylindrical portion is substantially the same as the thickness of the wire. The amount of protrusion of the first protruding portion toward the restricting portion side is larger by a dimension substantially the same as the thickness of the wire than the amount of protrusion of the second protruding portion toward the restricting portion side. The lens driving device according to claim 2 or claim 3.

5. The amount of protrusion of the first protruding portion toward the restricting portion side is a natural number multiple of the thickness of the wire. The number of winding layers constituting the winding portion is an even number. The number of windings of the wire constituting the outermost layer of the winding portion is one less than the number of windings of the wire constituting the adjacent layer which is the second layer from the outside adjacent to the outermost layer. The wire constituting the adjacent layer is disposed over the entire area between the one surface of the flange portion and the restricting portion. The wire constituting the outermost layer is disposed such that each of the plurality of wire annular portions constituting the outermost layer is positioned between two adjacent wire annular portions adjacent in the optical axis direction of the adjacent layer. The lens driving device according to claim 4.

6. The lens driving device according to any one of claims 1 to 3, the lens body, and an image pickup device facing the lens body. Camera module.

Images