Lens driving device and camera module

Abstract

Provided is a lens driving device capable of suppressing a difference in electromagnetic force caused by a difference in the number of turns of a wire. The lens driving device (101) has a lens holding member (2) and a coil (3). The coil (3) is provided with a winding part (13), and the winding part (13) is arranged between the flange part (52) and the limiting part (12h) of the lens holding part (2) and is formed by winding a wire rod on the periphery of the cylindrical part (12). The winding section (13) has six winding layers (WL) that overlap radially outward from the outer peripheral surface (EF) of the coil support section (12j). A first wire rod annular portion (WA11) of a first turn of the winding portion (13) connected to the left extension portion (33L) is disposed such that a position of a second portion (WP2) is closer to a restriction portion (12h) side (Z1 side) than a first portion (WP1) by approximately the same dimension as the thickness (DS1) of the wire rod.

Description

Technical Field

[0001] The present disclosure relates to, for example, a lens driving device mounted on a camera-equipped portable device or the like, and a camera module including the lens driving device. Background Art

[0002] Conventionally, there has been known a lens driving device that moves a lens holding member in the optical axis direction by a driving unit including a coil wound around the outer periphery of the lens holding member and a magnet mounted on a fixed-side member (see Patent Document 1). This lens driving device is configured such that the winding start portion and the winding end portion of the wire material constituting the coil are arranged on opposite sides across the optical axis.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-095067 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] However, in the above-described lens driving device, the wire material constituting the coil is wound around the lens holding member such that the number of turns of the wire material 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 winding start portion and the winding end portion. That is, the wire material constituting the coil is wound around the lens holding member such that one semi-circular portion is shorter than the other semi-circular portion by an amount of half a turn. Therefore, when an electric current flows through the coil, there is a concern that a slight difference is generated in the electromagnetic force generated between the coil and the magnet.

[0008] Therefore, it is desired to provide a lens driving device capable of suppressing the difference in electromagnetic force caused by such a difference in the number of turns of the wire material.

[0009] Means for Solving the Technical Problem

[0010] 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 supporting member that supports the lens holding member so as to be movable in the optical axis direction; and a driving unit including at least a coil provided outside the cylindrical portion of the lens holding member and a plurality of magnets opposed to the coil, and moving 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 spaced apart from and opposed to the flange portion in the optical axis direction. On the flange portion, a first notch portion and a second notch portion are formed at positions opposed to each other across the cylindrical portion, and 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 winding start portion of the winding portion; and a second extending portion connected to the winding end portion 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 that overlap from the outer peripheral surface of the cylindrical portion toward the radially outer side, and the wire annular portion of the first turn of the winding portion connected to the first extending portion is arranged such that, in the direction along the outer peripheral surface of the cylindrical portion, compared with a first portion existing in a first region between the first notch portion and the second notch portion, a second portion existing in a second region different from the first region between the second notch portion and the first notch portion is closer to the restricting portion side by a dimension amount approximately the same as the thickness of the wire.

[0011] Advantages of the Invention

[0012] The above-described lens driving device can suppress the difference in electromagnetic force caused by the difference in the number of turns of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view of the lens driving device.

[0014] Figure 2 is an exploded perspective view of the lens driving device.

[0015] Figure 3 is a top perspective view of the lens driving device in a state where a part of the components is removed.

[0016] Figure 4 is a top perspective view of the lens holding member.

[0017] Figure 5It is a bottom perspective view of the lens holding member.

[0018] Figure 6 It is a bottom view of the lens driving device in a state where a part of the component is removed.

[0019] Figure 7 It is a diagram showing an example of the connection structure of the leaf spring holding member, the yoke, and the upper side leaf spring.

[0020] Figure 8 It is a bottom view of the lens holding member, the coil, and the lower side leaf spring.

[0021] Figure 9 It is a right side view of the lens holding member, the coil, and the lower side leaf spring.

[0022] Figure 10 It is a top perspective view of the metal member and the base member.

[0023] Figure 11 It is a left side view of the lens holding member.

[0024] Figure 12 It is a right side view of the lens holding member.

[0025] Figure 13 It is a front view and a front sectional view of the lens holding member.

[0026] Figure 14 It is a right side view and a right side sectional view of the lens holding member.

[0027] Figure 15 It is a rear view and a left side view of the lens holding member.

[0028] Figure 16 It is a front sectional view of the lens holding member.

[0029] Figure 17 It is a right side sectional view of the lens holding member.

[0030] Figure 18 It is a front view and a front sectional view of the lens holding member.

[0031] Figure 19 It is a right side view and a right side sectional view of the lens holding member.

[0032] Figure 20 It is a rear view and a left side view of the lens holding member.

[0033] Figure 21 It is a front sectional view of the lens holding member.

[0034] Figure 22 It is a right side sectional view of the lens holding member.

[0035] Explanation of Reference Numerals

[0036] Detailed implementation mode

[0037] Hereinafter, the lens driving device 101 according to the embodiment of the present invention will be described with reference to the drawings. Figure 1 is a perspective view of the lens driving device 101, Figure 2 is an exploded perspective view of the lens driving device 101. In Figure 1 and Figure 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. In addition, 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 Figure 1 , the X1 side of the lens driving device 101 corresponds to the front side (front surface side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (rear surface side) of the lens driving device 101. In addition, 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. In addition, the Z1 side of the lens driving device 101 corresponds to the upper side (object 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.

[0038] As Figure 2 shown, the lens driving device 101 includes a lens holding member 2 that can hold a lens body (not shown); a driving unit DM that moves the lens holding member 2 in the optical axis direction (Z-axis direction); a leaf spring 6 as a supporting member that supports the lens holding member 2 so as to be movable in the optical axis direction; a fixed-side member FB that fixes the leaf spring 6; 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 is along the optical axis direction. The optical axis direction includes the direction of the optical axis OA related to the lens body and the direction parallel to the optical axis OA.

[0039] As Figure 2As shown, the drive unit DM includes: a coil 3 wound around the lens holding member 2, a yoke 4 serving as a cover member and also as a rectangular box-shaped outer casing, and four magnets 5 arranged opposite to 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 the lens holding member 2 and the yoke 4, and a lower leaf spring 26 connecting 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.

[0040] As Figure 1 shown, the lens driving device 101 has a substantially rectangular parallelepiped shape and is mounted on a substrate (not shown) on which a photographing element (not shown) is mounted. The camera module is composed of a substrate, the lens driving device 101, a lens body mounted on the lens holding member 2, and a photographing element 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 current flows through the coil 3, the drive unit DM generates an electromagnetic force along the optical axis direction.

[0041] The lens driving device 101 uses this electromagnetic force to move the lens holding member 2 along the optical axis direction on the Z1 side (object side) of the photographing element, thereby realizing the autofocus function. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the photographing element to enable macro photography, and moves the lens holding member 2 in a direction closer to the photographing element to enable infinity photography.

[0042] Next, with reference to Figures 3 - 6 , the positional relationship between the lens holding member 2 and the drive unit DM will be described. Figure 3 is a perspective view from above of the lens driving device 101 in a state where a part of the components is removed. Specifically, Figure 3 the upper figure of Figure 3 is a perspective view from above of the lens driving device 101 in a state where the leaf spring holding member 1 is removed, Figure 3 the central figure of Figure 4 is a perspective view from above of the lens driving device 101 in a state where the upper leaf spring 16 is further removed, Figure 5 the lower figure of Figure 4 is a perspective view from above of the lens driving device 101 in a state where the yoke 4 is further removed. Figure 5 is a perspective view from above of the lens holding member 2, Figure 4 the lower figure of Figure 5The following figure is a view of the lens holding member 2 around which the coil 3 is wound. Figure 6 It is a bottom view of the lens holding member 2 in a state where a part of the constituent elements is removed. Specifically, Figure 6 The upper figure of 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. Figure 6 The lower figure of is a bottom view of the lens driving device 101 in a state where the lower side plate spring 26 and the lens holding member 2 are further removed.

[0043] 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 Figure 4 shown, the lens holding member 2 includes a cylindrical portion 12 formed with an opening 12k serving as a through hole along the optical axis direction, and a flange portion 52 formed at an end portion on the imaging element side (Z2 side) in the optical axis direction. The cylindrical portion 12 is formed in a substantially cylindrical shape at the end portion on the subject side (Z1 side) in the optical axis direction.

[0044] The lens body is configured to be fixed to the inside of the cylindrical portion 12 using an adhesive. A spiral groove may also be provided on the inner peripheral surface of the cylindrical portion 12. This is to improve the adhesive strength between the lens body and the cylindrical portion 12. In addition, on the end face of the cylindrical portion 12 on the subject side, four pedestal portions 12d having recesses 12dh are provided so as to surround the optical axis OA. As Figure 3 shown, the inner side portion 16i of the upper side plate spring 16 is placed on the pedestal portion 12d.

[0045] As Figure 4 shown in the upper figure of , a coil support portion 12j serving 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 octagonal ring shape so as to be able to support the octagonal ring-shaped coil 3. Moreover, on the subject side of the coil support portion 12j, a restricting portion 12h protruding radially outward is formed so as to face the flange portion 52 in the optical axis direction. And, as Figure 4 shown in the lower figure of , 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 be sandwiched between the restricting portion 12h and the flange portion 52 in the optical axis direction. In the illustrated example, the coil 3 is held on the lens holding member 2 without using an adhesive, but it may also be fixed to the lens holding member 2 using an adhesive.

[0046] In this way, the flange portion 52 protrudes radially outward from the outer peripheral surface of 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 Figure 5As shown in the lower figure below, on the flange portion 52, two notch portions 52k are formed across the optical axis OA of the lens body. Moreover, a part of the conductive wire material (lead wire) constituting the coil 3, that is, the extending portion 33, passes through the notch portion 52k. Specifically, the left extending portion 33L, which is the lead wire portion on the winding start side of the coil 3, passes through the left notch portion 52kL, which is one of the notch portions 52k, and the right extending portion 33R, which is the lead wire portion on the winding end side of the coil 3, passes through the right notch portion 52kR, which is the other of the notch portions 52k.

[0047] As Figure 5 As shown in the upper figure above, the flange portion 52 includes two holding portions 72, which are square convex-shaped protruding portions protruding downward (in the Z2 direction) from the side facing the imaging element (Z2 side), six protruding setting portions 2p having a circular convex shape, and two abutting portions 2q having a circular convex shape. In addition, at least one of the protruding setting portions 2p and the abutting portions 2q may also be square convex-shaped.

[0048] As Figure 5 As shown in the lower figure below, the holding portion 72 includes a left holding portion 72L corresponding to the winding start side of the coil 3 (winding portion 13) and a right holding portion 72R corresponding to the winding end side of the coil 3 (winding portion 13). The left extending portion 33L is wound and held by the left holding portion 72L, and the right extending portion 33R is wound and held by the right holding portion 72R.

[0049] As Figure 5 As shown in the upper figure above and Figure 6 As shown in the upper figure above, the protruding setting portions 2p include three protruding setting portions 2p corresponding to the lower left side plate spring 26L and three protruding setting portions 2p corresponding to the lower right side plate spring 26R. The inner portion 26i of the lower side plate spring 26, which is the movable side support portion, is positioned and fixed to the protruding setting portion 2p. The protruding setting portion 2p is inserted through a circular hole 26k, which is a through hole, formed in the inner portion 26i (inner joint portion 26c) of the lower side plate spring 26. In addition, the through hole only needs to correspond to the shape of the protruding setting portion 2p, and may be a hole other than a circular hole such as a square hole or an elliptical hole, or may be a notch.

[0050] Next, the drive unit DM of the lens driving device 101 will be described. As Figure 6 As shown in the lower figure below, the drive unit DM includes a coil 3, a yoke 4, and four magnets 5 arranged so as to face the four corners of the yoke 4 respectively. Moreover, the drive unit DM generates a driving force (thrust) by using 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.

[0051] As Figure 5As shown in the following figure, the coil 3 is formed by winding a wire around the outer periphery of the lens holding member 2. The coil 3 includes a winding portion 13 that is wound into an octagonal ring shape and forms the coil main body portion, and an extension portion 33 that extends from the winding portion 13 and is wound around the holding portion 72.

[0052] The extension portion 33 includes: a left extension portion 33L that is connected to an end portion (winding start portion 13S) of the winding portion 13 located on the inner peripheral side of the coil 3 (winding portion 13) at the winding start side of the coil 3; and a right extension portion 33R that is connected to an end portion (winding end portion 13E) of the winding portion 13 located on the outer peripheral side of the coil 3 (winding portion 13) at the winding end side of the coil 3.

[0053] Specifically, as Figure 5 shown in the following figure, the left extension portion 33L includes a winding portion 33m wound around the left holding portion 72L, a connecting portion 33c that extends to face the imaging element side (Z2 side) of the flange portion 52, and an insertion portion 33k that is inserted through the left notch portion 52kL and extends from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side). Similarly, the right extension portion 33R includes a winding portion 33m wound around the right holding portion 72R, a connecting portion 33c that extends to face the imaging element side (Z2 side) of the flange portion 52, and an insertion portion 33k that is inserted through the right notch portion 52kR and extends from the imaging element side (Z2 side) of the flange portion 52 to the subject side (Z1 side).

[0054] In the illustrated example, the wire forming the left extension portion 33L of the coil 3 is wound around the left holding portion 72L of the lens holding member 2 before being wound around the outer periphery of the lens holding member 2, that is, before forming the winding portion 13. In the illustrated example, the left extension portion 33L, which is a part of the wire, is wound around the left holding portion 72L four times. Thus, the winding portion 33m is formed on the left holding portion 72L, and a part of the left extension portion 33L is held by the left holding portion 72L. However, the left extension portion 33L may also be wound around the left holding portion 72L after the wire is wound around the outer periphery of the lens holding member 2, that is, after forming the winding portion 13.

[0055] After the left extension portion 33L is wound around the left holding portion 72L, the wire is wound around the outer periphery of the lens holding member 2. At this time, the 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 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 extension portion 33L, and the portion passing through the left notch portion 52kL constitutes the insertion portion 33k of the left extension portion 33L. In addition, 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 extension portion 33L.

[0056] As shown Figure 4 in the following figure, 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 in a state of being sandwiched between the restricting portion 12h and the flange portion 52 while being supported from the inside by the coil support portion 12j (refer to Figure 4 the upper figure). Further, since the inner peripheral surface of the winding portion 13 is supported isotropically and well-balanced by the coil support portions 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 such that the optical axis OA of the lens body held by the lens holding member 2 easily coincides with the central axes of the lens holding member 2 and the coil 3, respectively.

[0057] When the winding of the wire around the outer periphery of the lens holding member 2 is completed, the right extension portion 33R connected to the end portion on the winding end side of the winding portion 13 is led out from the subject side of the flange portion 52 to the imaging element side of the flange portion 52 via the right notch portion 52kR, as Figure 5 shown in the following figure. 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 extension portion 33R is wound 4 times around the right holding portion 72R. The portion between the insertion portion 33k and the winding portion 33m of the right extension portion 33R constitutes the connecting portion 33c of the right extension portion 33R.

[0058] Next, the yoke 4 constituting the drive portion DM will be described. In the present embodiment, the yoke 4 is manufactured by performing blanking and drawing processes on a plate material made of a soft magnetic material such as iron. Specifically, as Figure 1 shown, the yoke 4 has a box-shaped outer shape that defines the accommodating portion 4s. Further, as Figure 2 shown, the yoke 4 has a rectangular cylindrical outer wall portion 4A and a flat plate-shaped upper surface portion 4B provided in a continuous manner with the upper end (the end portion on the Z1 side) of the outer wall portion 4A. The yoke 4 configured in this way accommodates the magnet 5 in the accommodating portion 4s in a state of being sandwiched between the outer wall portion 4A and the coil 3, as Figure 6 shown in the following figure, and is combined with the base member 18 to form a frame HS together with the base member 18, as Figure 3 shown in the upper figure. However, the yoke 4 may be replaced with a cover member made of a non-magnetic material such as austenitic stainless steel.

[0059] Next, the magnet 5 constituting the drive portion DM will be described. As Figure 2 shown, the magnet 5 has a quadrangular prism shape with a trapezoidal bottom surface. Further, as Figure 6As shown in the following figure, four magnets 5 are located outside the coil 3 and are arranged in such a way that they respectively face the four corners of the outer wall portion 4A of the rectangular cylindrical yoke 4. Moreover, the magnets 5 are fixed to the inner surface of the yoke 4 by an adhesive. In addition, the magnets 5 are arranged, for example, with the inner side (the side facing the optical axis OA) being the N pole and the outer side being the S pole, or the inner side being the S pole and the outer side being the N pole.

[0060] Next, the leaf spring 6 and the fixed-side member FB will be described. Figure 7 is a diagram showing an example of the connection structure of three components (the leaf spring holding member 1, the yoke 4, and the upper side leaf spring 16). Specifically, Figure 7 The upper diagram of is a bottom perspective view of the leaf spring holding member 1. Figure 7 The central diagram of is a bottom perspective view of the leaf spring holding member 1 and the upper side leaf spring 16. Figure 7 The lower diagram of is a bottom perspective view of the leaf spring holding member 1, the yoke 4, and the upper side leaf spring 16. Figure 8 and Figure 9 is a diagram showing an example of the connection structure between the lower right side leaf spring 26R and the coil 3 (right extension portion 33R). Specifically, Figure 8 is Figure 6 an enlarged view of the range R1 shown in the upper diagram of, Figure 9 is an enlarged view of the lower right side leaf spring 26R, the coil 3, and the lens holding member 2 when observing the range R1 from the Y2 side. In addition, in Figure 8 and Figure 9 , the solder SD that joins the coil 3 and the lower right side leaf spring 26R is indicated by cross hatching. In addition, for easy understanding of the explanation, in Figure 8 , the lower right side leaf spring 26R is indicated by a dashed line, and in Figure 9 , the illustration of the yoke 4 is omitted. Figure 10 is a diagram for explaining the base member 18 as the fixed-side member FB. Specifically, Figure 10 The upper diagram of is an upper perspective view of the base member 18, Figure 10 The central diagram of is an upper perspective view of the metal member 7, Figure 10 The lower diagram of is an upper perspective view of the base member 18 in which the metal member 7 is embedded.

[0061] In the present embodiment, the leaf spring 6 is made of a metal plate mainly made of a copper alloy. The leaf spring 6 includes Figure 3 the upper side leaf spring 16 arranged between the lens holding member 2 and the yoke 4 as shown in the upper diagram of, and Figure 6The lower side leaf springs 26 disposed between the lens holding member 2 and the base member 18 as shown in the upper figure above. In a state where the lens holding member 2 and the leaf springs 6 (the upper side leaf spring 16, the lower left side leaf spring 26L, and the lower right side leaf spring 26R) are respectively connected, the leaf springs 6 support the lens holding member 2 in such a manner that the lens holding member 2 can move in the optical axis direction (Z-axis direction). The lower side leaf springs 26 (the lower left side leaf spring 26L and the lower right side leaf spring 26R) also function as power supply members for supplying current to the coil 3. Accordingly, the lower left side leaf spring 26L is electrically connected to one end of the coil 3, and the lower right side leaf spring 26R is electrically connected to the other end of the coil 3.

[0062] As Figure 3 shown in the upper figure above, the upper side leaf spring 16 is substantially rectangular in plan 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 (the leaf spring holding member 1 and the yoke 4), and four elastic arm portions 16g located between the inner portion 16i and the outer portion 16e. Specifically, the inner portion 16i is provided in a circular ring shape so as to surround the optical axis OA. The outer portion 16e has four corner portions 16b and four cross bars 16r connecting two adjacent corner portions 16b among the four corner portions 16b.

[0063] In the illustrated example, the upper side leaf spring 16 is formed to be substantially bilaterally symmetric, and is configured to be fixed to the lens holding member 2 through the inner portion 16i and fixed to the leaf spring holding member 1 and the yoke 4 through the outer portion 16e. Accordingly, the upper side leaf spring 16 can support the lens holding member 2 with good balance.

[0064] When the upper side leaf spring 16 is mounted on the lens driving device 101, as Figure 3 shown in the upper figure above, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (refer to Figure 3 the central figure). Further, 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 upper surface portion 4B of the leaf spring holding member 1 and the yoke 4 and fixed with an adhesive.

[0065] The leaf spring holding member 1 is configured to be able to hold the upper side leaf spring 16 on the subject side (Z1 side) of the yoke 4. Specifically, as Figure 7 shown in the upper figure above, the leaf spring holding member 1 is substantially rectangular ring-shaped, and has four corner portions 1c (a first corner portion 1c1 to a fourth corner portion 1c4), protrusions 1p (a first protrusion 1p1 to a fourth protrusion 1p4) respectively protruding downward (Z2 direction) from the four corner portions 1c, and a recess 1r formed on the inner side of the bottom surface (the surface on the Z2 side).

[0066] The protruding portion 1p is inserted through a circular hole 16k, which is a through-hole formed in the corner portion 16b of the upper leaf spring 16 (refer to Figure 3 the upper figure), and is also inserted through circular holes 4k, which are through-holes formed in the four corner portions of the upper surface portion 4B constituting the yoke 4 (refer to Figure 3 the central figure).

[0067] More specifically, as shown in the upper figure of Figure 7 , the protruding portion 1p in the leaf spring holding member 1 includes a first protruding portion 1p1 to a fourth protruding portion 1p4. As shown in the central figure of Figure 3 , the circular holes 4k formed in the yoke 4 include a first circular hole 4k1 to a fourth circular hole 4k4. As shown in the upper figure of Figure 3 , the circular holes 16k formed in the upper leaf spring 16 include a first circular hole 16k1 to a fourth circular hole 16k4. Moreover, as shown in the central figure of Figure 7 , the first protruding portion 1p1 is inserted through the first circular hole 16k1 formed in the upper leaf spring 16, the second protruding portion 1p2 is inserted through the second circular hole 16k2, the third protruding portion 1p3 is inserted through the third circular hole 16k3, and the fourth protruding portion 1p4 is inserted through the fourth circular hole 16k4. Furthermore, as shown in the lower figure of Figure 7 , the first protruding portion 1p1 is inserted through the first circular hole 4k1 formed in the upper surface portion 4B of the yoke 4, the second protruding portion 1p2 is inserted through the second circular hole 4k2, the third protruding portion 1p3 is inserted through the third circular hole 4k3, and the fourth protruding portion 1p4 is inserted through the fourth circular hole 4k4.

[0068] After that, hot riveting is performed on the protruding portion 1p. In Figure 7 , the protruding portion 1p is shown in a state where the front end is deformed after hot riveting. Additionally, cold riveting can also be performed on the protruding portion 1p.

[0069] In this way, the outer portion 16e of the upper leaf spring 16 is clamped 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.

[0070] The concave portion 1r of the leaf spring holding member 1 is configured to allow elastic deformation of the elastic arm portion 16g of the upper side leaf spring 16. In the illustrated example, when no current flows through the coil 3, the lens holding member 2 is not floating in the air, but is urged by the leaf spring 6 toward the imaging element side (Z2 side), and contacts 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 moves toward the subject side (Z1 side) by electromagnetic force, separates from the base member 18, and is held in the air. At this time, the portion where the elastic arm portion 16g of the upper side leaf spring 16 contacts the inner portion 16i is displaced upward (in the Z1 direction). The concave portion 1r of the leaf spring holding member 1 is formed to allow this displacement.

[0071] As Figure 3 shown in the upper figure above, even when no current flows through the coil 3, the upper end of the lens holding member 2 protrudes upward (in the Z1 direction) from the upper surface portion 4B of the yoke 4. Therefore, the concave portion 1r of the leaf spring holding member 1 is formed to allow not only the displacement of the elastic arm portion 16g but also the further protrusion of the lens holding member 2 when current flows through the coil 3.

[0072] As Figure 6 shown in the upper figure above, the lower left side leaf spring 26L and the lower right side leaf spring 26R are formed to be substantially symmetrical with each other left and right, and the shape of the inner side (the side facing the optical axis OA) of each of them is substantially semicircular. Moreover, the lower left side leaf spring 26L and the lower right side leaf spring 26R each include 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.

[0073] As Figure 6 shown in the upper figure above, the inner portions 26i of the lower left side leaf spring 26L and the lower right side leaf spring 26R each include three inner engagement portions 26c that engage with the lens holding member 2 and a connecting plate portion 26h that faces the extension portion 33 of the coil 3.

[0074] When the lower left side leaf spring 26L and the lower right side leaf spring 26R are mounted on the lens holding member 2, Figure 5 the six protruding portions 2p of the lens holding member 2 shown in the upper figure above are respectively inserted through in Figure 6The round holes 26k as through-holes are provided at the inner joint portions 26c of the left lower side leaf spring 26L and the right lower side leaf spring 26R shown in the upper figure above. The round holes 26k as through-holes may also be notches. Thus, the inner portions 26i of the left lower side leaf spring 26L and the right lower side leaf spring 26R are positioned and fixed to the lens holding member 2. The left lower side leaf spring 26L and the right lower side leaf spring 26R are fixed to the lens holding member 2, for example, by thermally riveting or cold riveting the protruding portion 2p of the lens holding member 2.

[0075] As Figure 8 and Figure 9 shown, when the right lower side leaf spring 26R is mounted on the lens holding member 2, the connecting plate portion 26h constituting the inner portion 26i of the right lower side leaf spring 26R faces the imaging element side (Z2 side) of the lens holding member 2. That is, the surface on the subject side (Z1 side) of the connecting plate portion 26h faces the surface on the imaging element side (Z2 side) of the flange portion 52 constituting the lens holding member 2. And, as Figure 9 shown, the connecting portion 33c of the right extension portion 33R of the coil 3 extends through between the surface on the subject side (Z1 side) of the inner portion 26i of the right lower side leaf spring 26R and the surface on the imaging element side (Z2 side) of the flange portion 52 of the lens holding member 2.

[0076] When the right lower side leaf spring 26R is mounted on the lens holding member 2, as Figure 9 shown, the right holding portion 72R protrudes downward (Z2 direction) of the inner portion 26i in such a manner that the front end thereof is located on the imaging element side (Z2 side) more than the inner portion 26i of the right lower side leaf spring 26R. In addition, a part of the winding portion 33m is wound around the right holding portion 72R in such a manner that it is located on the imaging element side (Z2 side) more than the inner portion 26i.

[0077] The right lower side leaf spring 26R is electrically and mechanically connected to the right extension portion 33R (winding portion 33m) of the coil 3. Specifically, as Figure 6 shown in the upper figure above, the right lower side leaf spring 26R is mounted on the lens holding member 2 in such a manner that the round hole 26k formed in the inner joint portion 26c is fitted to the protruding portion 2p of the lens holding member 2. And, the protruding portion 2p of the lens holding member 2 is thermally riveted, and the solder paste applied to the connecting plate portion 26h is laser-heated. However, the right lower side leaf spring 26R and the right extension portion 33R of the coil 3 may also be electrically and mechanically connected by a conductive adhesive in which conductive fillers such as silver particles are dispersed in a synthetic resin. In addition, the above description with reference to Figure 8 and Figure 9 similarly applies to the connection of the left lower side leaf spring 26L, the lens holding member 2, and the coil 3.

[0078] AsFigure 6 As shown in the above figure, the outer portion 26e of the lower left side leaf spring 26L includes two outer engaging portions 26d that engage with the base member 18. Similarly, the outer portion 26e of the lower right side leaf spring 26R includes two outer engaging portions 26d that engage with the base member 18.

[0079] The base member 18 is produced, for example, by injection molding using a synthetic resin such as liquid crystal polymer. In the present embodiment, as Figure 10 shown, 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. In addition, four protruding portions 18t protruding upward are provided on the surface of the base member 18 on the subject side (Z1 side). The protruding portions 18t are inserted through and fitted into through holes 26t provided in the outer engaging portions 26d of the lower left side leaf spring 26L and the lower right side leaf spring 26R respectively (refer to Figure 6 the above figure). At this time, the protruding portions 18t are thermally riveted and fixed to the outer engaging portions 26d. In Figure 10 , the protruding portions 18t are shown in a state where the front ends are deformed after being thermally riveted. In addition, the protruding portions 18t may be cold-riveted and fixed to the outer engaging portions 26d.

[0080] As Figure 10 shown, in the base member 18, a metal member 7 is insert-molded and buried, and the metal member 7 is formed of a metal plate made of a material such as an alloy containing copper or iron or having them as main components.

[0081] The metal member 7 includes a first metal member 7A to a third metal member 7C. The first metal member 7A has a connecting portion 7AC exposed from the upper surface (the surface on the Z1 side) of the base member 18, and the second metal member 7B has a connecting portion 7BC exposed from the upper surface (the surface on the Z1 side) of the base member 18. The surface of the connecting portion 7AC and the surface of the connecting portion 7BC are located on the same plane.

[0082] The connecting portion 7AC is connected to the outer engaging portion 26d of the lower right side leaf spring 26R via a conductive bonding material in a state of being opposed to a through hole 26dt formed in the outer engaging portion 26d of the lower right side leaf spring 26R (refer to Figure 6 the above figure). The conductive bonding material is, for example, solder or a conductive adhesive. In the present embodiment, the conductive bonding material is a conductive adhesive.

[0083] Similarly, the connecting portion 7BC is connected to the outer engaging portion 26d of the lower left side leaf spring 26L via a conductive bonding material in a state of being opposed to a through hole 26dt formed in the outer engaging portion 26d of the lower left side leaf spring 26L (refer to Figure 6 the above figure).

[0084] In addition, the first metal component 7A has a terminal portion 7AT that protrudes downward from the bottom surface (the surface on the Z2 side) of the base component 18, and the second metal component 7B has a terminal portion 7BT that protrudes downward from the bottom surface (the surface on the Z2 side) of the base component 18.

[0085] The third metal component 7C has end portions 7C1 to 7C4 that protrude outward from the corner portions of the base component 18 in a direction perpendicular to the optical axis direction. As Figure 1 shown, the end portions 7C1 to 7C4 are respectively configured to contact the lower end portions of the four corners of the yoke 4.

[0086] After the inner surface of the outer wall portion 4A of the yoke 4 and the outer peripheral side surface of the base component 18 are combined and positioned, the end portions 7C1 to 7C4 are respectively welded to the lower end portions of the four corners of the yoke 4 to fix the base component 18 to the yoke 4. The yoke 4 and the base component 18 can also be fixed at least partially with an adhesive.

[0087] Next, with reference to Figures 11 - 17 , the positional relationship between the lens holding member 2 and the coil 3 will be described. Figures 11 - 15 is a view of the lens holding member 2 observed from a direction perpendicular to the optical axis direction. Specifically, Figure 11 the upper figure of Figure 11 is a left side view of the lens holding member 2X as a comparative example, Figure 11 and the lower figure of Figure 12 is a left side view of the lens holding member 2. Figure 12 shows the state when only the innermost layer (the first layer WL1) of the six winding layers WL forming the winding portion 13 of the coil 3 is wound. Figure 12 The upper figure of Figure 13 is a front view of the lens holding member 2. Figure 13 The lower figure of Figure 4 is a cross-sectional view of the lens holding member 2 wound with the coil 3, showing the cross-section of the lens holding member 2 and the coil 3 observed from the X1 side in a virtual plane parallel to the YZ plane including the cut line CL1 in the lower figure of Figure 14 The upper figure of Figure 14 is a right side view of the lens holding member 2. Figure 4 The lower figure of Figure 15 is a cross-sectional view of the lens holding member 2 wound with the coil 3, showing the cross-section of the lens holding member 2 and the coil 3 observed from the Y2 side in a virtual plane parallel to the XZ plane including the cut line CL2 in the lower figure of Figure 15The following figure is a left side view of the lens holding member 2. Figure 16 and Figure 17 are cross-sectional views of the lens holding member 2 and the coil 3. Specifically, Figure 16 the left figure of Figure 13 is an enlarged view of the range R2 surrounded by the dashed line in the following figure of Figure 16 and the right figure of Figure 13 is an enlarged view of the range R3 surrounded by the dashed line in the following figure of Figure 17 the left figure of Figure 14 is an enlarged view of the range R4 surrounded by the dashed line in the following figure of Figure 17 and the right figure of Figure 14 is an enlarged view of the range R5 surrounded by the dashed line in the following figure of Figure 16 and Figure 17 for clarity, only a cross-sectional pattern (slant pattern) is added to the cross-section of the wire material constituting the coil 3.

[0088] The wire (wire material) constituting the coil 3 has a conductive metal wire and an insulating covering layer covering the metal wire. The covering layer has a double-layer structure including an insulating layer covering the metal wire and a welding layer disposed around the insulating layer. In Figures 11 - 17 for clarity, the illustration of the covering layer is omitted. Moreover, when the coil 3 is wound around the outer periphery of the lens holding member 2, the welding layers of the respective two wire material annular portions WA adjacent to each other are thermally welded to each other.

[0089] In Figure 11 the upper figure of

[0090] only the innermost layer (the first layer WL1) of the six winding layers WL of the winding portion 13 constituting the coil 3 is wound around the lens holding member 2X as a comparative example. The first layer WL1 includes 9 turns of wire material annular portions WA (the first wire material annular portion WA11 to the ninth wire material annular portion WA19). Figure 11 the first wire material annular portion WA11 extends parallel to the XY plane from the starting point WA11S which is also the winding start point 13S of the winding portion 13 to the midpoint WA11M, and then extends obliquely upward to the end point WA11E, and is connected to the starting point WA12S of the second wire material annular portion WA12 at the end point WA11E. In addition, in

[0091] The ninth wire loop portion WA19 extends parallel to the XY plane from the starting point WA19S to the intermediate point WA19M. After that, it straddles the inclined portion TD of the eighth wire loop portion WA18 and overlaps with the outer side of the inclined portion TD of the eighth wire loop portion WA18. At the end point WA19E, it is connected to the starting point of the first wire loop portion WA21 of the second layer WL2 (not shown in the upper figure in Figure 11 ).

[0092] 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 figure in Figure 12 , on the lens holding member 2X, the last wire loop portion WA in the outermost layer (the sixth layer WL6), that is, the eighth wire loop portion WA68, is shorter by half a turn compared to the other wire loop portions WA (the first wire loop portion WA61 to the seventh wire loop portion WA67) in the outermost layer (the sixth layer WL6). Specifically, as shown in the upper figure in Figure 12 , when the end point WA68E of the eighth wire loop portion WA68, which is also the winding end portion 13E of the winding portion 13, reaches the right notch portion 52kR, it passes through the right notch portion 52kR from the subject side (Z1 side) of the flange portion 52 and is led out to the imaging element side (Z2 side) of the flange portion 52.

[0093] In this configuration, the number of turns (the number of wire loop portions WA) of the sixth layer WL6, which is the outermost layer, is reduced by half a turn of the eighth wire loop portion WA68. Moreover, when the number of wire loop portions WA of the outermost layer closest to the magnet 5 is reduced, the thrust generated by the drive unit DM decreases. In addition, a difference in the thrust generated by the drive unit DM occurs between the X1 side (the side where the eighth wire loop portion WA68 with a half - turn amount exists) and the X2 side (the side where there is no wire loop portion with a half - turn amount), resulting in imbalance.

[0094] Therefore, as shown in the lower figure in Figure 11 , the lens holding member 2 of the embodiment of the present disclosure has a protruding portion PT equivalent to a wire of half a turn amount on the outer peripheral surface EF of the coil support portion 12j, which is the portion wound with the wire, so that the number of turns (the number of wire loop portions WA) of the outermost layer is not reduced. In addition, in Figure 11 , Figure 13 , Figure 14 , and Figure 15 , for clarity, a dot pattern is added to the surface of the protruding portion PT. In addition, in Figure 16 and Figure 17 , for clarity, a cross pattern is added to the cross - section of the protruding portion PT.

[0095] Specifically, in Figure 11In the following figure, on the lens holding member 2, similar to the case of the lens holding member 2X as a comparative example, 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. The first layer WL1 includes 9 turns of the wire ring portion WA (the first wire ring portion WA11 to the ninth wire ring portion WA19).

[0096] Approximately half a turn of the first wire ring portion WA11 starting from the starting point WA11S of the winding start portion 13S of the winding portion 13 also extends parallel to the XY plane. After that, it straddles the height adjustment portion HA of the protruding portion PT (refer to Figure 14 the upper figure) and overlaps with the upper side of the height adjustment portion HA. Then, it extends along the first protruding portion PT1 of the protruding portion PT that extends parallel to the XY plane and is connected to the starting point WA12S of the second wire ring portion WA12 at the end point WA11E. The same applies to the second wire ring portion WA12 to the ninth wire ring portion WA19.

[0097] As Figure 13 shown in the following figure, the left extension 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 ring portion WA11 of the first layer WL1. In addition, as Figure 13 shown in the following figure, the right extension 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 ring portion WA68 of the sixth layer WL6.

[0098] As Figure 15 shown in the following figure, a recess 12U is formed in the portion of the coil support portion 12j corresponding to the winding start portion 13S of the winding portion 13. In Figure 15 it, for clarity, a cross pattern is added to the recess 12U. As Figure 16 shown, the recess 12U is a structure for aligning the radial position of the first wire ring portion WA11 in the first layer WL1 with the radial positions of the other wire ring portions WA (the second wire ring portion WA12 to the ninth wire ring portion WA19) in the first layer WL1.

[0099] Since the first layer WL1 is wound around the outer peripheral surface EF of the coil support portion 12j in this way, therefore as Figure 12As shown in the figure below, on the lens holding member 2, the last wire loop portion WA in the outermost layer (the sixth layer WL6), that is, the eighth wire loop portion WA68, has the same length as the other wire loop portions WA (the first wire loop portion WA61 to the seventh wire loop portion WA67) in the outermost layer (the sixth layer WL6). Specifically, both the starting point WA68S and the ending point WA68E of the eighth wire loop portion WA68 are located above the right notch portion 52kR. When the ending point WA68E reaches the right notch portion 52kR, it is led 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.

[0100] In this configuration, unlike the case of the lens holding member 2X, the number of turns (the number of wire loop portions WA) of the sixth layer WL6, which is the outermost layer, does not decrease by half a turn of the eighth wire loop 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 on the X1 side and the X2 side and loss of balance.

[0101] More specifically, as Figure 16 shown, 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 9 turns of wire loop portions WA (the first wire loop portion WA11 to the ninth wire loop portion WA19), the second layer WL2 includes 8 turns of wire loop portions WA (the first wire loop portion WA21 to the eighth wire loop portion WA28), the third layer WL3 includes 9 turns of wire loop portions WA (the first wire loop portion WA31 to the ninth wire loop portion WA39), the fourth layer WL4 includes 8 turns of wire loop portions WA (the first wire loop portion WA41 to the eighth wire loop portion WA48), the fifth layer WL5 includes 9 turns of wire loop portions WA (the first wire loop portion WA51 to the ninth wire loop portion WA59), and the sixth layer WL6 includes 8 turns of wire loop portions WA (the first wire loop portion WA61 to the eighth wire loop portion WA68). That is, the winding portion 13 includes 51 turns of wire loop portions WA.

[0102] The protruding portion PT includes a height adjustment portion HA and a first protruding portion PT1. As Figure 14 shown in the upper figure, the height adjustment portion HA is a portion that gradually becomes higher in the Z-axis direction along the width WD in the X-axis direction. The first protruding portion PT1 is a portion that extends parallel to the XY plane and does not change in height in the Z-axis direction. In the illustrated example, the first protruding portion PT1 is higher than the upper surface of the flange portion 52 by an amount equal to the diameter (thickness DS1) of the wire (refer to Figure 17 ).

[0103] This configuration can suppress a reduction in the thrust generated by the drive unit DM by preventing the number of turns of the outermost wire ring portion WA closest to the magnet 5 from decreasing by half a turn.

[0104] Next, a lens holding member 2A, which is another configuration example of the lens holding member 2, will be described with reference to Figures 18 - 22 . Figures 18 - 22 FIG. is a view of the lens holding member 2A as viewed from a direction perpendicular to the optical axis direction. Specifically, Figure 18 the upper figure of is the front view of the lens holding member 2A, corresponding to Figure 13 the upper figure of. Figure 18 the lower figure of is a cross-sectional view of the lens holding member 2A around which the coil 3 is wound, corresponding to Figure 13 the lower figure of. Figure 19 the upper figure of is the right side view of the lens holding member 2A, corresponding to Figure 14 the upper figure of. Figure 19 the lower figure of is a cross-sectional view of the lens holding member 2A around which the coil 3 is wound, corresponding to Figure 14 the lower figure of. Figure 20 the upper figure of is the rear view of the lens holding member 2A, corresponding to Figure 15 the upper figure of. Figure 20 the lower figure of is the left side view of the lens holding member 2A, corresponding to Figure 15 the lower figure of. Figure 21 and Figure 22 are cross-sectional views of the lens holding member 2A and the coil 3. Figure 21 Corresponding to Figure 16 , Figure 22 corresponding to Figure 17 . Specifically, Figure 21 the left figure of is an enlarged view of the range R6 surrounded by the dashed line in Figure 18 the lower figure of, Figure 21 the right figure of is an enlarged view of the range R7 surrounded by the dashed line in Figure 18 the lower figure of. Additionally, Figure 22 the left figure of is an enlarged view of the range R8 surrounded by the dashed line in Figure 19 the lower figure of, Figure 22 the right figure of is an enlarged view of the range R9 surrounded by the dashed line in Figure 19 the lower figure of. Additionally, in Figure 21 and Figure 22 , for clarity, a cross-sectional pattern (hatched pattern) is added to the cross-section of the wire forming the coil 3.

[0105] In Figure 11 the upper figure of and Figure 12In the lens holding member 2X shown in the figure above, when the number of turns of the winding portion 13 is reduced to adjust the resistance value of the wire material of the coil 3, the number of turns of the sixth layer WL6, which is the outermost layer (the number of wire loop portions WA), is reduced. Further, when the number of wire loop portions WA of the outermost layer closest to the magnet 5 is reduced, the decrease in the thrust generated by the drive unit DM becomes larger compared to the case where the number of wire loop portions WA of the layer closer to the inside is reduced.

[0106] Therefore, Figures 18 - 22 The lens holding member 2A shown is configured such that a protrusion PT is provided on the outer peripheral surface EF of the coil support portion 12j, which is a portion where the wire is wound, and the number of turns of the first layer WL1, which is the innermost layer (the number of wire loop portions WA), can be reduced by two. Further, in Figures 18 - 20 for clarity, a dot pattern is added to the surface of the protrusion PT. Further, in Figure 21 and Figure 22 for clarity, a cross pattern is added to the cross section of the protrusion PT.

[0107] Further, the lens holding member 2A is different from the lens holding member 2 in that the protrusion PT includes a second protrusion PT2, but is the same as the lens holding member 2 in other respects.

[0108] The second protrusion PT2 is the same as the first protrusion PT1 and is a portion that extends parallel to the XY plane and has a constant height in the Z-axis direction. Further, as Figure 22 shown, the second protrusion PT2 is configured to be lower than the first protrusion PT1 by an amount corresponding to the thickness DS1 of the wire. Further, in the illustrated example, the second protrusion PT2 is configured to have a height equivalent to twice the thickness DS1 of the wire so that the number of turns of the first layer WL1, which is the innermost layer (the number of wire loop portions WA), can be reduced by two. Further, the second protrusion PT2 may also be configured to have a height of three times or more the thickness DS1 of the wire so that the number of turns of the first layer WL1, which is the innermost layer (the number of wire loop portions WA), can be reduced by three or more.

[0109] This configuration has the effect of being able to adjust the resistance value of the wire material of the coil 3 while suppressing a decrease in the thrust generated by the drive unit DM by reducing the number of wire loop portions WA of the innermost layer farthest from the magnet 5 instead of reducing the number of wire loop portions WA of the outermost layer closest to the magnet 5.

[0110] As described above, as Figure 2As shown, the lens driving device 101 of 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 supporting member that supports the lens holding member 2 so as to be movable in the optical axis direction (Z-axis direction); and a driving unit DM including at least a coil 3 provided outside the cylindrical portion 12 of the lens holding member 2 and a plurality (four) of magnets 5 opposed to the coil 3, the driving unit DM moving the lens holding member 2 relative to the fixed-side member FB in the optical axis direction. The lens holding member 2 has a flange portion 52 protruding radially outward from the outer peripheral surface EF of the cylindrical portion 12 and a restricting portion 12h separated from and opposed to the flange portion 52 in the optical axis direction. On the flange portion 52, two notch portions 52k (a left notch portion 52kL and a right notch portion 52kR) are formed at positions opposed to each other across the cylindrical portion 12, and holding portions 72 are provided corresponding to the two notch portions 52k, respectively. The coil 3 has: 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 portion 52 and one surface (the surface on the Z2 side) of the restricting portion 12h; a first extension portion (a left extension portion 33L) connected to the winding start portion 13S of the winding portion 13; and a second extension portion (a right extension portion 33R) connected to the winding end portion 13E of the winding portion 13. The first extension portion (the left extension portion 33L) is held by the first holding portion (the left holding portion 72L) through the first notch portion (the left notch portion 52kL), and the second extension portion (the right extension portion 33R) is held by the second holding portion (the right holding portion 72R) through the second notch portion (the right notch portion 52kR).

[0111] As Figure 16 and Figure 17 shown, the winding portion 13 has a plurality (six) of winding layers WL overlapping radially outward from the outer peripheral surface EF of the cylindrical portion 12 (coil supporting portion 12j). Moreover, as Figure 17 shown, the wire annular portion WA (the first wire annular portion WA11) of the first turn of the winding portion 13 connected to the first extension portion (the left extension portion 33L) is arranged such that, in the direction along the outer peripheral surface EF of the cylindrical portion 12 (the direction of winding the wire, i.e., the direction parallel to the XY plane), compared with the first part WP1 of the first region ZN1 existing between the first notch portion (the left notch portion 52kL) and the second notch portion (the right notch portion 52kR), the second part WP2 existing between the second notch portion (the right notch portion 52kR) and the first notch portion (the left notch portion 52kL) and in a second region ZN2 different from the first region ZN1 is located at a position on the restricting portion 12h side (the Z1 side) by a dimension approximately the same as the thickness DS1 of the wire. Additionally, in Figure 17In the example shown, the wire loop portion WA (first wire loop portion WA11) of the first turn of the winding portion 13 is wound around the second region ZN2 after being wound around the first region ZN1. That is, in the wire loop portion WA (first wire loop portion WA11) of the first turn of the winding portion 13, the first part WP1 existing in the first region ZN1 is connected to the first extension portion (left extension portion 33L).

[0112] This configuration has the effect of making the number of wires in the outermost layer constituting 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 deviation of the electromagnetic force generated by the coil 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.

[0113] In addition, as Figure 17 shown, in the second region ZN2, a first protrusion PT1 is provided at the 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 second part WP2 of the wire loop portion WA (first wire loop portion WA11) of the first turn is disposed in contact with the surface on the side of the restricting portion 12h (Z1 side) in the first protrusion PT1. In addition, the protruding amount PX1 of the first protrusion PT1 from the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j) toward the radially outer side is substantially the same as the thickness DS1 of the wire.

[0114] This configuration has the following effects: By the first protrusion PT1, it is possible to easily make the position (height in the Z-axis direction) of the wire of the first turn different in the first region ZN1 and the second region ZN2. In addition, this configuration has the effect of being able to appropriately form the adjacent layer, that is, the second layer WL2, located at a position adjacent to the innermost layer WL1 of the winding portion 13.

[0115] In addition, as Figure 16 shown, 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, that is, the portion corresponding to the second notch portion (right notch portion 52kR) (the portion forming the second notch portion), a height adjustment portion HA that is in contact with the wire loop portion WA (first wire loop portion WA11) of the first turn is provided integrally with the cylindrical portion 12 (coil support portion 12j). That is, the height adjustment portion HA is provided on the side (Y2 side) corresponding to the second notch portion (right notch portion 52kR) in the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j), rather than on the side (Y1 side) corresponding to the first notch portion (left notch portion 52kL). And from Figure 14As can be seen from the figure above, the height position in the optical axis direction (Z-axis direction) of the wire loop portion WA (the first wire loop portion WA11) of the first turn wound from the first region ZN1 to the second region ZN2 gradually changes in the circumferential direction by the height adjustment portion HA. In addition, in the illustrated example, the height adjustment portion HA is continuously formed with the first protrusion portion PT1, but they may also be arranged with a gap therebetween.

[0116] This configuration can gradually change the height of the wire (wire loop portion WA) in the Z-axis direction, and thus has the effect of being able to suppress the occurrence of winding disorder in the winding portion 13.

[0117] In addition, as Figure 22 shown, in the first region ZN1, a second protrusion portion PT2 may also be provided at the 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). In this case, the wire loop portion WA of the first turn (the first portion WP1 of the first wire loop portion WA11) is arranged in contact with the surface on the side of the restricting portion 12h (Z1 side) of the second protrusion portion PT2. In addition, the amount of protrusion PX2 of the second protrusion portion PT2 from the outer peripheral surface EF of the cylindrical portion 12 (coil support portion 12j) toward the radially outer side is substantially the same as the thickness DS1 of the wire. Moreover, the amount of protrusion PZ1 of the first protrusion portion PT1 toward the restricting portion 12h side (Z1 side) is larger than the amount of protrusion PZ2 of the second protrusion portion PT2 toward the restricting portion 12h side (Z1 side) by a dimension amount substantially the same as the thickness DS1 of the wire.

[0118] This configuration has the following effect: by adjusting the amounts of protrusion of the first protrusion portion PT1 and the second protrusion portion PT2 in the optical axis direction, the number of wires in the outermost layer (the sixth layer WL6) close to the magnet 5 can be increased.

[0119] In addition, as Figure 22 shown, the amount of protrusion PZ1 of the first protrusion portion PT1 toward the restricting portion 12h side (Z1 side) with respect to one surface (the surface on the Z1 side) of the flange portion 52 is preferably a natural number multiple of the thickness DS1 of the wire. The number of winding layers WL constituting the winding portion 13 is an even number. The number of turns of the wire in the outermost layer of the winding portion 13 is one less than the number of turns of the wire in the adjacent layer which is the second layer from the outside adjacent to the outermost layer. The wires constituting the adjacent layer are arranged in the entire region from one surface (the surface on the Z1 side) of the flange portion 52 to the restricting portion 12h. The wires constituting the outermost layer are arranged such that the plurality of wire loop portions WA constituting the outermost layer are respectively located between two wire loop portions WA adjacent in the optical axis direction of the adjacent layer.

[0120] In Figure 22In the example shown, the protruding amount PZ1 of the first protruding portion PT1 toward the restricting portion 12h side (Z1 side) is three times the wire thickness DS1 of the wire material. The number of winding layers WL that make up the winding portion 13 is six. The number of turns (8 turns) of the wire material in the outermost layer (the sixth layer) that makes up the winding portion 13 is one less than the number of turns (9 turns) of the wire material in the adjacent layer (the fifth layer) that is the second layer from the outside adjacent to the outermost layer. The wire material that makes up the adjacent layer (the fifth layer) is arranged without gaps in the entire area from one surface (the surface on the Z1 side) of the flange portion 52 to the restricting portion 12h. The wire material that makes up the outermost layer (the sixth layer) is arranged such that the eight wire material annular portions WA that make up the outermost layer (the sixth layer) are respectively located between two wire material annular portions WA that are adjacent in the optical axis direction (Z-axis direction) and make up the adjacent layer (the fifth layer). Specifically, the first wire material annular portion WA61 that makes up the outermost layer (the sixth layer) farthest from the cylindrical portion 12 is arranged to be located between the eighth wire material annular portion WA58 and the ninth wire material annular portion WA59 that make up the adjacent layer (the fifth layer) in the Z-axis direction.

[0121] This configuration has the following effect: The number of wire materials in the outermost layer (the sixth layer WL6) increases, and the thrust of the drive unit DM can be improved.

[0122] 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 embodiments. Various modifications and substitutions can be applied to the above embodiments without departing from the scope of the present invention. In addition, the respective features described with reference to the above embodiments can be appropriately combined as long as they are not technically contradictory.

[0123] For example, in the above embodiment, the base member 18 constitutes the fixed-side member FB, but it may also constitute the movable-side member that holds the magnet 5 (the magnet holding member in a lens driving device having an optical hand shake correction function).

Claims

1. A lens driving device, comprising: Fixed side parts; A lens holding component having a cylindrical portion capable of holding a lens body; a supporting member that supports the lens holding member so as to be movable in the optical axis direction; and The driving unit includes at least a coil provided outside the cylindrical portion of the lens holding member and a plurality of magnets facing the coil, and moves the lens holding member along the optical axis direction. The lens holding member includes: a flange portion protruding radially outward from the outer peripheral surface of the cylindrical portion; and a restricting portion separated from and facing the flange portion in the optical axis direction. A first notch and a second notch are formed on the flange at positions opposite to each other across the cylindrical portion, and a first retaining portion is provided corresponding to the first notch, and a second retaining portion is provided corresponding to the second notch. The coil comprises: a winding portion formed by winding a wire material around the outer periphery of the cylindrical portion between one side of the flange portion and the limiting portion; a first extending portion connected to a winding start portion of the winding portion; and a second extending portion connected to a winding end portion of the winding portion. The first extension portion passes through the first notch portion and is held by the first holding portion, and the second extension portion passes through the second notch portion and is held by the second holding portion. It is characterized in that In the lens driving device, The winding portion includes a plurality of winding layers, the plurality of winding layers being overlapped from the outer peripheral surface of the cylindrical portion toward the radially outer side, The annular portion of the wire of the first turn of the winding portion connected to the first extension portion is configured so that, in the direction along the outer circumferential surface of the cylindrical portion, the position of the second portion located between the second notch portion and the first notch portion and existing in a second area different from the first area is closer to the limiting portion side by an amount approximately the same as the thickness of the wire, compared to the first portion located between the first notch portion and the second notch portion and existing in the first area.

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

3. The lens driving device according to claim 2, wherein: A height adjustment portion connected to the annular portion of the wire rod of the first turn is integrally provided with the cylindrical portion at a position corresponding to the second notch portion. The height position in the optical axis direction of the annular portion of the wire of the first turn wound from the first region to the second region is gradually changed in the circumferential direction by the height adjusting portion.

4. The lens driving device according to claim 2 or 3, characterized in that: In the first region, a second protrusion is provided at a corner formed by the one surface of the flange portion and the outer peripheral surface of the cylindrical portion. The annular portion of the wire of the first turn is arranged in contact with a surface of the second protruding portion on the side of the restricting portion. The amount by which the second protrusion protrudes radially outward from the outer peripheral surface of the cylindrical portion is substantially the same as the thickness of the wire material. The protrusion amount of the first protrusion toward the restriction portion is larger than the protrusion amount of the second protrusion toward the restriction portion by an amount substantially equal to the thickness of the wire.

5. The lens driving device according to claim 4, characterized in that: The protrusion amount of the first protrusion toward the limiting portion is a natural number times the thickness of the wire. The number of the winding layers constituting the winding portion is an even number, The number of turns of the wire material constituting the outermost layer of the winding portion is one less than the number of turns of the wire material constituting the adjacent layer which is the second layer from the outside adjacent to the outermost layer, The wire material constituting the adjacent layer is arranged over the entire region from the one surface of the flange portion to the limiting portion, The wire members constituting the outermost layer are arranged so that the plurality of wire ring portions constituting the outermost layer are respectively located between two wire ring portions constituting the adjacent layer that are adjacent in the optical axis direction.

6. A camera module, characterized in that: have: The lens driving device according to any one of claims 1 to 3; the lens body; and The imaging element is opposite to the lens body.

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