Lens drive device and camera module
The lens driving device addresses winding disorder issues by employing specialized coil support structures, ensuring stable coil winding and preventing misalignment, thereby enhancing operational reliability.
Patent Information
- Application Number
- JP2024004463
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2025-07-29
Smart Images
Figure 2025110564000001_ABST
Abstract
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 that moves a lens holding member along the optical axis direction by a driving unit composed of a coil wound around a coil support portion protruding radially outward from the side surface of the lens holding member to the outside of the diameter of a circle centered on the optical axis, and a magnet attached to a fixed-side member is known (see Patent Document 1). In this lens driving device, the coil has a coil axis perpendicular to the optical axis direction and is configured to have a plurality of winding layers. And each winding layer is configured to include an annular portion of a wire wound around the coil support portion in a plurality of turns.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the above-described lens driving device, when measures against winding disorder of the wire constituting the coil are not taken, a gap is formed between the annular portion of the wire of the first turn and the surface of the lens holding member at the transition portion from the first turn to the second turn of the first layer, which is the innermost layer of the plurality of winding layers, and there is a risk that other annular portions of the wire (for example, the annular portion of the wire of the second layer) enter this gap, resulting in winding disorder of the wire constituting the coil.
[0005] Therefore, it is desirable to provide a lens driving device capable of suppressing the occurrence of winding disorder of the wire constituting the coil.
Means for Solving the Problems
[0006] The lens driving device according to an embodiment of the present invention includes a lens holding member 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, a coil member provided on the lens holding member and formed of a wire in which a first coil, a second coil, and a relay portion connecting the first coil and the second coil in series are continuous, a first magnet and a second magnet facing the first coil and the second coil respectively, wherein the lens holding member includes a first holding portion provided on one end side in the optical axis direction for holding one end portion of the wire and a second holding portion for holding the other end portion, a first coil arrangement surface provided on one of two outer surfaces facing each other across the optical axis, a second coil arrangement surface provided on the other, a relay surface positioned between the first coil arrangement surface and the second coil arrangement surface and facing the relay portion, a first coil support portion protruding outward from the first coil arrangement surface around which a first wire annular portion constituting the first coil is wound, and a second coil support portion protruding outward from the second coil arrangement surface around which a second wire annular portion constituting the second coil is wound, and the first coil support portion has a first support protrusion, a second support protrusion, and an intermediate support protrusion that are spaced apart from each other and arranged side by side in the extending direction of the first wire annular portion perpendicular to the optical axis direction. In the lens driving device, the first coil is wound around the periphery of the first coil support portion with a portion where the wire extending from the first holding portion is bent to one side in the extending direction at the first support protrusion or the intermediate support protrusion as the start end of the first turn, and a raised portion is provided at the base of the second support protrusion at a position on the extension line of the first wire annular portion extending from the start end of the first turn.
Advantages of the Invention
[0007] The above-described lens driving device can suppress the winding disorder of the wire constituting the coil (first coil).
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
Embodiments for Carrying Out the Invention
[0009] Hereinafter, the camera module CM and the lens driving device 101 according to the embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the camera module CM, and FIG. 2 is an exploded perspective view of the lens driving device 101 that constitutes the camera module CM. In FIG. 1, 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 camera module CM corresponds to the front side (front surface side) of the camera module CM, and the X2 side of the camera module CM corresponds to the rear side (rear surface side) of the camera module CM. Also, the Y1 side of the camera module CM corresponds to the left side of the camera module CM, and the Y2 side of the camera module CM corresponds to the right side of the camera module CM. Also, the Z1 side of the camera module CM corresponds to the upper side (subject side) of the camera module CM, and the Z2 side of the camera module CM corresponds to the lower side (imaging element side) of the camera module CM. The same applies to other members and other figures.
[0010] As shown in FIG. 1, the camera module CM includes a substrate SB, a lens driving device 101, a lens body LS, and an imaging element IS mounted on the substrate SB so as to face the lens body LS. The lens body LS is, for example, a cylindrical lens barrel including 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 LS and a direction parallel to the optical axis OA.
[0011] As shown in FIG. 2, the lens driving device 101 includes a lens holding member 2 capable of holding the lens body LS, 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 functions as a conductive member that provides an electrical connection between an external power source and the lens driving device 101.
[0012] As shown in Fig. 2, the drive unit DM includes a coil member 3 attached to the lens holding member 2, a yoke 4 serving as a cover member that also functions as an outer case having a substantially rectangular outer shape in top view, and two magnets 5 disposed opposite to the front and rear surfaces of the yoke 4, respectively. In the illustrated example, the magnet 5 is a permanent magnet with two-pole magnetization and includes a front magnet 5F and a rear magnet 5B. 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.
[0013] The leaf spring 6 includes an upper leaf spring 16 disposed between the leaf spring holding member 1 and the lens holding member 2, and a lower leaf spring 26 disposed 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.
[0014] As shown in Fig. 1, the lens drive device 101 has a substantially rectangular parallelepiped shape and is mounted on a substrate SB on which an imaging element IS is mounted.
[0015] The coil member 3 is connected to a power source via the lower leaf spring 26, the metal member 7, and the substrate SB. When an electric current flows through the coil member 3, the drive unit DM generates an electromagnetic force along the optical axis direction.
[0016] The lens drive device 101 utilizes this electromagnetic force to move the lens holding member 2 along the optical axis direction on the Z1 side (subject side) of the imaging element IS, thereby realizing an autofocus function. Specifically, the lens drive device 101 moves the lens holding member 2 in a direction away from the imaging element IS to enable macro photography, and moves the lens holding member 2 in a direction approaching the imaging element IS to enable infinity photography.
[0017] Next, with reference to FIGS. 3 to 8, 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 diagram of FIG. 3 is an upper perspective view of the lens driving device 101 with the yoke 4 removed, the central diagram of FIG. 3 is an upper perspective view of the lens driving device 101 with the leaf spring holding member 1 further removed, and the lower diagram of FIG. 3 is an upper perspective view of the lens driving device 101 with the upper leaf spring 16 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 diagrams of FIGS. 4 and 5 show the lens holding member 2 without the coil member 3 wound, and the lower diagrams of FIGS. 4 and 5 show the lens holding member 2 with the coil member 3 wound. FIG. 6 is a front view of the lens holding member 2 and a bottom view of the front side portion of the lens holding member 2. FIG. 7 is a rear view of the lens holding member 2 and a bottom view of the rear side portion of the lens holding member 2. FIG. 8 is a bottom view of the lens driving device 101 in a state where a part of the components is removed. Specifically, the upper diagram of FIG. 8 is a bottom view of the lens driving device 101 with the metal member 7 and the base member 18 removed, and the lower diagram of FIG. 8 is a bottom view of the lens driving device 101 with the lower leaf spring 26 and the lens holding member 2 further removed.
[0018] The leaf spring holding member 1 is arranged so as to prevent the lens holding member 2 and the yoke 4 from colliding when the lens holding member 2 moves in the Z1 direction. That is, the leaf spring holding member 1 functions as a spacer member and is arranged so as to be able to form a space between the lens holding member 2 and the upper surface portion 4B of the yoke 4. However, if a space can be formed between the lens holding member 2 and the upper surface portion 4B of the yoke 4 by another member or structure, etc., the leaf spring holding member 1 may be omitted. In the illustrated example, the leaf spring holding member 1 is manufactured by injection molding a synthetic resin such as liquid crystal polymer (LCP).
[0019] 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 protruding portion 52 formed at an end portion on the imaging element IS side (Z2 side) in the optical axis direction. The cylindrical portion 12 is formed to be substantially cylindrical at an end portion on the subject side (Z1 side) in the optical axis direction.
[0020] The lens body LS 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 LS and the cylindrical portion 12. Further, four pedestal portions 12d having depressions 12dh are provided so as to surround the optical axis OA on the end surface of the cylindrical portion 12 on the subject side. As shown in FIG. 3, the inner portion 16i of the upper plate spring 16 is placed on the pedestal portion 12d.
[0021] On the outer peripheral surface of the cylindrical portion 12, as shown in the upper figure of FIG. 4, a coil support portion 14 for supporting the coil member 3 from the inside is provided. In the illustrated example, the coil support portion 14 is formed so as to be able to support a substantially rectangular ring-shaped coil member 3. And, at the end portion of the lens holding member 2 on the subject side, a flange portion 12h protruding radially outward is formed so as to face the protruding portion 52 in the optical axis direction.
[0022] Specifically, as shown in the upper diagram of FIG. 5, the coil support portion 14 includes a front coil support portion 14F and a rear coil support portion 14B. As shown in the lower diagram of FIG. 5, the coil member 3 includes a front coil 3F and a rear coil 3B. More specifically, the front coil support portion 14F includes a left front support protrusion 14FL, a central front support protrusion 14FM, and a right front support protrusion 14FR. The rear coil support portion 14B includes a left rear support protrusion 14BL, a central rear support protrusion 14BM, and a right rear support protrusion 14BR. In the illustrated example, the left front support protrusion 14FL, the central front support protrusion 14FM, the right front support protrusion 14FR, the left rear support protrusion 14BL, the central rear support protrusion 14BM, and the right rear support protrusion 14BR all have substantially rectangular end faces. And the relay portion 3J that connects the front coil 3F and the rear coil 3B, also called a jumper wire, is disposed between the eaves portion 12h and the protrusion 52 in the optical axis direction. In the illustrated example, the coil member 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.
[0023] The protrusion 52 protrudes radially outward from the outer peripheral surface at the end of the cylindrical portion 12 on the imaging element IS side (Z2 side). And the relay portion 3J of the coil member 3 is disposed on the relay surface 2J formed on the subject side (Z1 side) of the protrusion 52.
[0024] As shown in the upper diagram of FIG. 5, the lens holding member 2 has two holding portions 72 as angular convex protrusions protruding downward (Z2 direction) from the surface on the imaging element IS side (Z2 side), six protruding portions 2p as round convex protrusions, and two abutting portions 2q as angular convex protrusions. Note that the protruding portions 2p may be angular convex, and the abutting portions 2q may be round convex.
[0025] The holding portion 72 is configured such that an extending portion 33, which is a part of the conductive wire forming the coil member 3, is wound thereon. In the illustrated example, as shown in the lower diagram of FIG. 5, the holding portion 72 includes a front holding portion 72F corresponding to the starting-side portion (front extending portion 33F) of the wire forming the coil member 3, and a rear holding portion 72B corresponding to the ending-side portion (rear extending portion 33B) of the wire forming the coil member 3. The front extending portion 33F is wound around and held by the front holding portion 72F, and the rear extending portion 33B is wound around and held by the rear holding portion 72B.
[0026] As shown in the upper diagrams of FIGS. 5 and 8, the protruding portions 2p include three protruding portions 2p corresponding to the lower left side plate spring 26L and three protruding portions 2p corresponding to the lower right side plate spring 26R. The inner portion 26i of the lower side plate spring 26 as the movable-side support portion is positioned and fixed to the protruding portions 2p. Specifically, the protruding portions 2p are inserted into circular holes 26k formed as through-holes in the inner portion 26i (inner joint portion 26c) of the lower side plate spring 26. Note that the through-hole may be a hole other than a circular hole, such as a square hole or an elliptical hole, or a notch, as long as it corresponds to the shape of the protruding portion 2p.
[0027] Next, the drive unit DM of the lens driving device 101 will be described. As shown in the lower diagram of FIG. 8, the drive unit DM includes a coil member 3, a yoke 4, and two magnets 5 disposed so as to face the front and rear surfaces of the yoke 4, respectively. The drive unit DM generates a driving force (thrust) by the current flowing through the coil member 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.
[0028] As shown in the lower diagram of FIG. 5, the coil member 3 is formed by winding a wire (conductive wire) around the outer periphery of the coil support portion 14. Each of the front coil 3F and the rear coil 3B forming the coil member 3 includes a winding portion 13 as a coil main body portion wound in a substantially rectangular annular shape, and an extending portion 33 extending from the winding portion 13 and wound around the holding portion 72. Specifically, the front coil 3F includes a front winding portion 13F and a front extending portion 33F, and the rear coil 3B includes a rear winding portion 13B and a rear extending portion 33B.
[0029] In other words, as shown in the upper diagram of FIG. 6, the extending portion 33 is connected to a front extending portion 33F that is connected to a starting end 13FS, which is an end portion of the front winding portion 13F located on the inner peripheral side of the front winding portion 13F, and a rear extending portion 33B that is connected to an ending end 13BE, which is an end portion of the rear winding portion 13B located on the outer peripheral side of the rear winding portion 13B, as shown in the upper diagram of FIG. 7.
[0030] Specifically, as shown in the lower diagram of FIG. 5, the front extending portion 33F includes a winding portion 33m that is wound around the front holding portion 72F, and the rear extending portion 33B includes a winding portion 33m that is wound around the rear holding portion 72B.
[0031] In the illustrated example, the front extending portion 33F is wound around the front holding portion 72F of the lens holding member 2 before the wire forming the front coil 3F is wound around the outer periphery of the front coil support portion 14F, that is, before the front winding portion 13F is formed. In the example shown in the lower diagram of FIG. 5, the front extending portion 33F is wound around the front holding portion 72F four turns. Thereby, the winding portion 33m is formed on the front holding portion 72F, and a part of the front extending portion 33F is held by the front holding portion 72F. However, the front extending portion 33F may be wound around the front holding portion 72F after the wire forming the coil member 3 is wound around the outer periphery of the front coil support portion 14F, that is, after the front winding portion 13F is formed.
[0032] After the front extending portion 33F is wound around the front holding portion 72F, the wire forming the coil member 3 is wound around the outer periphery of the front coil support portion 14F. At that time, the wire extending from the winding portion 33m extends so as to face the bottom surface of the front recessed portion 2RF, which is a groove formed in the front coil arrangement surface 2CF, as shown in the upper diagram of FIG. 6, and contacts the upper left corner portion of the central front support protrusion 14FM and extends above the central front support protrusion 14FM.
[0033] The front winding portion 13F of the front coil 3F wound around the outer periphery of the front coil support portion 14F is fixed (held) in a state of being supported from the inside by the left front support protrusion 14FL, the central front support protrusion 14FM, and the right front support protrusion 14FR, as shown in the lower diagram of FIG. 4.
[0034] When the winding of the wire around the outer periphery of the front coil support portion 14F is completed, as shown in the lower diagram of FIG. 5, the relay portion 3J connected to the winding end 13FE of the front winding portion 13F is drawn out to the rear side (X2 side) of the lens holding member 2 via the relay surface 2J formed between the eaves portion 12h and the protruding portion 52, and extends so as to face the bottom surface of the rear recessed portion 2RB, which is a groove formed in the rear coil placement surface 2CB, as shown in the upper diagram of FIG. 7, and is connected to the winding start end 13BS of the rear winding portion 13B.
[0035] Thereafter, the wire constituting the coil member 3 is wound around the outer periphery of the rear coil support portion 14B. At that time, the wire extending from the relay portion 3J contacts the upper surface of the central rear support protrusion 14BM and extends toward the left rear support protrusion 14BL.
[0036] The rear winding portion 13B of the rear coil 3B wound around the outer periphery of the rear coil support portion 14B is fixed (held) in a state of being supported from the inside by the left rear support protrusion 14BL, the central rear support protrusion 14BM, and the right rear support protrusion 14BR, as shown in the lower diagram of FIG. 5.
[0037] When the winding of the wire around the outer periphery of the rear coil support portion 14B is completed, as shown in the upper diagram of FIG. 7, the rear extending portion 33B connected to the winding end 13BE of the rear winding portion 13B is wound around the rear holding portion 72B. In the illustrated example, the rear extending portion 33B is wound around the rear holding portion 72B five turns.
[0038] 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 bottomless box-shaped outer shape that defines a storage portion 4s. The yoke 4 has a rectangular cylindrical outer wall portion 4A and a flat annular 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 houses the magnet 5 in the storage portion 4s so as to sandwich the magnet 5 between the outer wall portion 4A and the coil member 3 as shown in the lower diagram of FIG. 8, and as shown in FIG. 1, it is coupled to the base member 18 and constitutes the housing HS together with the base member 18. However, the yoke 4 may be replaced with a cover member made of a non-magnetic material such as austenitic stainless steel.
[0039] Next, the magnet 5 that constitutes the drive unit DM will be described. As shown in FIG. 2, the magnet 5 has a substantially rectangular parallelepiped shape. The magnet 5 is located outside the coil member 3 and is arranged so as to face the front and rear surfaces of the rectangular cylindrical outer wall portion 4A that constitutes the yoke 4 as shown in the lower diagram of FIG. 8. The magnet 5 is fixed to the inner surface of the yoke 4 by an adhesive. Further, the magnet 5 is arranged such that, for example, the upper side (the subject side) is the N pole and the lower side is the S pole, or the upper side is the S pole and the lower side is the N pole.
[0040] Next, the leaf spring 6 and the fixed-side member FB will be described. FIG. 9 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. 9 is a bottom perspective view of the leaf spring holding member 1. The central diagram of FIG. 9 is a bottom perspective view of the leaf spring holding member 1 and the upper leaf spring 16, and the lower diagram of FIG. 9 is a bottom perspective view of the leaf spring holding member 1, the yoke 4, and the upper leaf spring 16. FIG. 10 is a diagram for explaining an example of the connection structure between the lower leaf spring 26 (the lower right leaf spring 26R) and the coil member 3 (the front extension portion 33F of the front coil 3F). Specifically, the upper diagram of FIG. 10 is an enlarged view of the range R1 surrounded by the broken line in the upper diagram of FIG. 8, and the lower diagram of FIG. 10 is an enlarged view of the lower leaf spring 26 (the lower right leaf spring 26R), the coil member 3 (the front coil 3F), and the lens holding member 2 when the range R1 is viewed from the X1 side. In FIG. 10, the solder SD joining the front coil 3F and the lower right leaf spring 26R is shown in a cross pattern. Also, for easier understanding of the explanation, in the upper diagram of FIG. 10, the lower right leaf spring 26R and the solder SD are represented by broken lines. FIG. 11 is a diagram for explaining the base member 18 as the fixed-side member FB. Specifically, the upper diagram of FIG. 11 is an upper perspective view of the base member 18, the central diagram of FIG. 11 is an upper perspective view of the metal member 7, and the lower diagram of FIG. 11 is an upper perspective view of the base member 18 in which the metal member 7 is embedded.
[0041] In the present embodiment, the leaf spring 6 is made of a metal plate mainly made of a copper alloy. And the leaf spring 6 includes an upper leaf spring 16 disposed between the leaf spring holding member 1 and the lens holding member 2, and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. 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 member 3. Therefore, the lower left leaf spring 26L is electrically connected to one end of the coil member 3, and the lower right leaf spring 26R is electrically connected to the other end of the coil member 3.
[0042] As shown in the central view 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 four elastic arm portions 16g located 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 bars 16r connecting two adjacent ones of the four corner portions 16b.
[0043] In the illustrated example, the upper plate spring 16 is formed to be substantially two-fold symmetric about the optical axis OA, 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 at the outer portion 16e. Therefore, the upper plate spring 16 can support the lens holding member 2 in a well-balanced manner.
[0044] When the upper plate spring 16 is attached to the lens holding member 2, as shown in the central view of FIG. 3, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see the lower view of FIG. 3). Then, as shown in the upper view of FIG. 3, 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 fixed to the plate spring holding member 1. The plate spring holding member 1 is fixed to the yoke 4 with an adhesive.
[0045] The plate spring holding member 1 is configured to hold the upper plate spring 16 inside the yoke 4. Specifically, as shown in the upper view of FIG. 9, the plate spring holding member 1 has a substantially rectangular annular shape, and has four corner portions 1c (first corner portion 1c1 to fourth corner portion 1c4) and protrusions 1p (first protrusion 1p1 to fourth protrusion 1p4) protruding downward (in the Z2 direction) from each of the four corner portions 1c. The four protrusions 1p are inserted into four round holes 16k (first round hole 16k1 to fourth round hole 16k4) formed as through holes in the four corner portions 16b of the upper plate spring 16, as shown in the central view of FIG. 9.
[0046] More specifically, as shown in the central figure of FIG. 9, the first protrusion 1p1 is inserted into the first round hole 16k1 formed in the upper leaf spring 16, the second protrusion 1p2 is inserted into the second round hole 16k2, the third protrusion 1p3 is inserted into the third round hole 16k3, and the fourth protrusion 1p4 is inserted into the fourth round hole 16k4.
[0047] Then, the four protrusions 1p of the leaf spring holding member 1 and the four corner portions 16b of the upper leaf spring 16 are joined by an adhesive. Note that the joining of the four protrusions 1p of the leaf spring holding member 1 and the four corner portions 16b of the upper leaf spring 16 may be realized by thermal caulking or cold caulking of the protrusions 1p. Further, the leaf spring holding member 1 is configured to allow elastic deformation of the elastic arm portions 16g constituting the upper leaf spring 16.
[0048] The lower left side plate spring 26L and the lower right side plate spring 26R are formed substantially symmetrically with respect to the left and right as shown in the upper figure of FIG. 8, and are configured such that the shape of the inner portion (the side facing the optical axis OA) of each of them is substantially semi-circular. And each of the lower left side plate spring 26L and the lower right side plate 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.
[0049] Each inner portion 26i of the lower left side plate spring 26L and the lower right side plate spring 26R includes two 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 member 3 as shown in the upper figure of FIG. 8.
[0050] 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. 8. The round hole 26k as the through hole may be a notch. Thereby, each inner portion 26i of the left lower side plate spring 26L and the right lower side plate spring 26R is 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.
[0051] As shown in the upper figure of FIG. 10, 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 IS 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 lens holding member 2 on the imaging element IS side (Z2 side). And as shown in the lower figure of FIG. 10, the front extending portion 33F constituting the coil member 3 extends along the Z-axis direction so as to face the bottom surface of the front recess 2RF formed in the front coil arrangement surface 2CF.
[0052] In a state where the right lower side plate spring 26R is attached to the lens holding member 2, as shown in the lower figure of FIG. 10, the front holding portion 72F protrudes downward (Z2 direction) from the inner portion 26i so that the tip thereof is located on the imaging element IS 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 front holding portion 72F so as to be located on the imaging element IS side (Z2 side) rather than the inner portion 26i.
[0053] The lower right side plate spring 26R and the winding portion 33m of the coil member 3 are electrically and mechanically connected by solder SD. Specifically, as shown in the upper figure of FIG. 8, 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 subjected to thermal caulking, and the solder paste applied to the connection plate portion 26h is heated by laser light. However, the front extending portion 33F of the lower right side plate spring 26R and the coil member 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 FIG. 10 is similarly applicable to the connection between the lower left side plate spring 26L, the lens holding member 2, and the rear coil 3B.
[0054] As shown in the upper figure of FIG. 8, 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.
[0055] The base member 18 is produced 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, as shown in FIG. 11, and a circular opening 18k is formed at the center. Further, six protruding portions 18p protruding upward are provided on the surface of the base member 18 on the subject side (Z1 side). The protruding portions 18p are inserted and fitted into through holes 26t (see the upper figure of FIG. 8) 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 18p are subjected to thermal caulking and fixed to the outer joint portions 26d. In FIG. 11, the protruding portions 18p are shown in a state where the tips are deformed after thermal caulking. Note that the protruding portions 18p may be fixed to the outer joint portions 26d by cold caulking.
[0056] As shown in FIG. 11, a metal member 7 formed of 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.
[0057] 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 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 exposed from the upper surface (the surface on the Z1 side) of the base member 18. In the illustrated example, the surfaces of the connection portion 7AC and the connection portion 7BC are located on the same plane.
[0058] The connection portion 7AC is connected to the outer joint portion 26d of the lower right side plate spring 26R by laser welding or a conductive bonding material or the like in a state of facing a through hole 26dt formed in the outer joint portion 26d of the lower right side plate spring 26R (see the upper figure in FIG. 8). The conductive bonding material is, for example, solder or a conductive adhesive.
[0059] Similarly, the connection portion 7BC is connected to the outer joint portion 26d of the lower left side plate spring 26L by laser welding or a conductive bonding material or the like in a state of facing a through hole 26dt formed in the outer joint portion 26d of the lower left side plate spring 26L (see the upper figure in FIG. 8).
[0060] Further, the first metal member 7A has a terminal portion 7AT protruding 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 protruding downward from the bottom surface (the surface on the Z2 side) of the base member 18.
[0061] The third metal member 7C has end portions 7C1 to 7C4 protruding 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.
[0062] 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 at least partially with an adhesive.
[0063] Next, with reference to FIGS. 12 to 16, the positional relationship between the lens holding member 2 and the coil member 3 will be described. FIG. 12 is a front view of the lens holding members 2, 2X, and 2Y. Specifically, the upper diagram in FIG. 12 is a front view of the lens holding member 2X as a comparative example, the central diagram in FIG. 12 is a front view of the lens holding member 2Y as another comparative example, and the lower diagram in FIG. 12 is a front view of the lens holding member 2 according to the embodiment of the present disclosure. FIG. 13 is a front view of the lens holding members 2, 2X, and 2Y around which the coil member 3 is wound. Specifically, the upper diagram in FIG. 13 is a front view of the lens holding member 2X around which the coil member 3 is wound, the central diagram in FIG. 13 is a front view of the lens holding member 2Y around which the coil member 3 is wound, and the lower diagram in FIG. 13 is a front view of the lens holding member 2 around which the coil member 3 is wound. FIG. 14 is a front view, a left side view, a right side view, an upper view, and a lower view of the left front support protrusion 14FL constituting the front coil support portion 14F. FIGS. 15 and 16 are partial cross-sectional views of the lens holding member 2 and the coil member 3. Specifically, the left diagram in FIG. 15 shows a cross-section of the lens holding member 2 and the coil member 3 as viewed from the Y2 side in a virtual plane parallel to the XZ plane including the cutting line CL1 in the lower diagram of FIG. 13. The right diagram in FIG. 15 shows a cross-section of the lens holding member 2 and the coil member 3 as viewed from the Y2 side in a virtual plane parallel to the XZ plane including the cutting line CL2 in the lower diagram of FIG. 13. The upper diagram in FIG. 16 shows a cross-section of the lens holding member 2 and the coil member 3 as viewed from the Z1 side in a virtual plane parallel to the XY plane including the cutting line CL3 in the lower diagram of FIG. 13. The lower diagram in FIG. 16 shows a cross-section of the lens holding member 2 and the coil member 3 as viewed from the Z1 side in a virtual plane parallel to the XY plane including the cutting line CL4 in the lower diagram of FIG. 13.
[0064] In this embodiment, the wire material constituting the coil member 3 is composed of a conductive metal wire and an insulating coating layer that coats the metal wire. The coating layer has a two-layer structure including an insulating layer that coats the metal wire and a fusion layer disposed around the insulating layer. When the coil member 3 is wound around the outer periphery of the coil support portion 14, the two wire material annular portions W adjacent to each other have their respective fusion layers thermally fused to each other. In FIGS. 13, 15, and 16, the coating layer is not shown for clarity.
[0065] The coil member 3 (front coil 3F) wound around the coil support portion 14 (front coil support portion 14F) of the lens holding member 2 includes eight winding layers WL (front winding layers WLF) as shown in FIG. 15. The eight front winding layers WLF include the first layer WLF1 to the eighth layer WLF8. The first layer WLF1 includes six turns of front wire material annular portions WF (first front wire material annular portions WF11 to WF16), the second layer WLF2 includes five turns of front wire material annular portions WF (first front wire material annular portions WF21 to WF25), the third layer WLF3 includes six turns of front wire material annular portions WF (first front wire material annular portions WF31 to WF36), the fourth layer WLF4 includes five turns of front wire material annular portions WF (first front wire material annular portions WF41 to WF45), the fifth layer WLF5 includes six turns of front wire material annular portions WF (first front wire material annular portions WF51 to WF56), the sixth layer WLF6 includes five turns of front wire material annular portions WF (first front wire material annular portions WF61 to WF65), the seventh layer WLF7 includes six turns of front wire material annular portions WF (first front wire material annular portions WF71 to WF76), and the eighth layer WLF8 includes five turns of front wire material annular portions WF (first front wire material annular portions WF81 to WF85). The same applies to the coil member 3 (front coil 3F) wound around the lens holding member 2X as a comparative example and the lens holding member 2Y as another comparative example.
[0066] And as a comparative example, the lens holding member 2X has a front recess 2RF on the Y1 side of the left front support protrusion 14FL as shown in the upper figure of FIG. 12. The wire forming the front coil 3F forms a winding start end 13FS at the upper left corner of the left front support protrusion 14FL, is wound around the front coil support portion 14F clockwise in a front view, and is configured such that an inclination start portion TS is formed at the lower left corner of the left front support protrusion 14FL. The inclination start portion TS is a portion where the inclination of the wire for the transition from the first turn (the first front wire annular portion WF11) to the second turn (the second front wire annular portion WF12) of the first layer WLF1 starts.
[0067] With such a configuration, the wire wound around the lens holding member 2X is wound around the front coil support portion 14F so as to be displaced toward the X1 side as it extends from the Z2 side to the Z1 side within the range ZN1 surrounded by the broken line as shown in the upper figure of FIG. 13. Therefore, in the range ZN1 which is the range corresponding to the short side on the left side of the front coil 3F, it is difficult to wind the wire in an aligned manner, and there is a risk of winding disorder. Specifically, in the transition portion from the first turn (the first front wire annular portion WF11) to the second turn (the second front wire annular portion WF12) of the first layer WLF1 which is the innermost layer of the eight winding layers WL, a gap is formed between the first front wire annular portion WF11 and the front coil arrangement surface 2CF, and there is a risk that other front wire annular portions WF (for example, the fifth front wire annular portion WF25 of the second layer WLF2) will enter this gap, causing winding disorder of the wire forming the front coil 3F. Also, since the relay portion 3J is drawn out from the range ZN1 which is the range including the winding end 13FE of the front coil 3F, winding disorder is likely to occur at this point as well, and there is a risk that the relay portion 3J will become loose.
[0068] Further, as another comparative example, the lens holding member 2Y has a front recess 2RF on the Y1 side of the central front support protrusion 14FM as shown in the central view of FIG. 12. The wire forming the front coil 3F forms a winding start end 13FS at the upper left corner of the central front support protrusion 14FM and is wound around the front coil support portion 14F clockwise in a front view, and is configured to form an inclination start portion TS at the upper left corner of the left front support protrusion 14FL.
[0069] With such a configuration, the wire wound around the lens holding member 2Y is wound around the front coil support portion 14F so as to be displaced toward the X1 side as it extends from the Y1 side to the Y2 side within the range ZN2 surrounded by the broken line as shown in the central view of FIG. 13. Therefore, in the range ZN2 which is the range corresponding to the upper long side of the front coil 3F, it is difficult to wind the wire in an aligned manner, and there is a risk of causing winding disorder. Specifically, in the transition portion from the first turn (the first front wire annular portion WF11) to the second turn (the second front wire annular portion WF12) of the first layer WLF1 which is the innermost layer of the eight winding layers WL, a gap is formed between the first front wire annular portion WF11 and the front coil arrangement surface 2CF, and there is a risk that other front wire annular portions WF (for example, the fifth front wire annular portion WF25 of the second layer WLF2) enter this gap, resulting in winding disorder of the wire forming the front coil 3F. Further, since the relay portion 3J is drawn out from within the range ZN2 which is the range including the winding end 13FE of the front coil 3F, winding disorder is likely to occur at this point as well, and there is a risk that the relay portion 3J becomes loose.
[0070] Therefore, as shown in the lower diagram of FIG. 12, the lens holding member 2 according to the embodiment of the present disclosure is configured to suppress the occurrence of winding disorder of the wire forming the front coil 3F by having a raised portion BM at the base of the left front support protrusion 14FL. That is, the lens holding member 2 is configured such that the aligned winding of the wire forming the front coil 3F can be easily realized even within a range ZN3 corresponding to the lower long side of the front coil 3F, and the occurrence of winding disorder can be suppressed. Specifically, as shown in the lower diagram of FIG. 6, at a position corresponding to the transition portion TR from the first turn (first front wire annular portion WF11) to the second turn (second front wire annular portion WF12) of the first layer WLF1 which is the innermost layer of the eight winding layers WL, the raised portion BM is arranged so as to fill the gap GP between the first front wire annular portion WF11 and the front coil arrangement surface 2CF, and other front wire annular portions WF (for example, the fifth front wire annular portion WF25 of the second layer WLF2) are prevented from entering the gap GP, thereby suppressing the occurrence of winding disorder of the wire forming the front coil 3F. In the lower diagrams of FIGS. 6, 12, 14, and 16, for clarity, a dot pattern is attached to the surface of the raised portion BM. Also, in the upper diagrams of FIGS. 15 and 16, for clarity, a cross pattern is attached to the cross section of the raised portion BM.
[0071] More specifically, as shown in the lower diagram of FIG. 12, the lens holding member 2 has a front recess 2RF on the Y1 side of the central front support protrusion 14FM, and the wire forming the front coil 3F forms a winding start end 13FS at the upper left corner of the central front support protrusion 14FM and is wound around the front coil support portion 14F clockwise in a front view, and is configured to form an inclination start portion TS at the lower right corner of the right front support protrusion 14FR. That is, as shown in the lower diagram of FIG. 6, the first front wire annular portion WF11 forming the first layer WLF1 of the front coil 3F is arranged such that the right end portion is located on the X1 side surface of the front coil arrangement surface 2CF, while the left end portion is located on the X1 side surface of the raised portion BM. Therefore, the first front wire annular portion WF11 is wound around the front coil support portion 14F so as to be displaced to the X1 side as it extends from the Y2 side to the Y1 side.
[0072] With such a configuration, the wire forming the front coil 3F is wound around the front coil support portion 14F so as to be displaced toward the X1 side as it extends from the Y2 side to the Y1 side in a state where at least a part of the gap GP between the first front wire annular portion WF11 and the front coil arrangement surface 2CF is filled by the raised portion BM within the range ZN3 surrounded by the broken line in the lower diagram of FIG. 13. Therefore, this configuration can suppress the occurrence of wire winding disorder caused by another front wire annular portion WF (for example, the fifth front wire annular portion WF25 of the second layer WLF2) entering the gap GP between the first front wire annular portion WF11 and the front coil arrangement surface 2CF. Also, since the relay portion 3J is not drawn out from within the range ZN3 for the wire forming the front coil 3F, winding disorder is also less likely to occur at this point, and loosening of the relay portion 3J is also less likely to occur.
[0073] Here, referring to FIG. 14, the details of the raised portion BM will be described. As shown in FIG. 14, the raised portion BM is provided at the base of each of the upper surface UF, the left surface LF, and the lower surface DF of the left front support protrusion 14FL. In the illustrated example, the raised portion BM is provided so as to have a width WD1 and a height HT1 at the base of the lower surface DF, a width WD2 and a height HT1 at the base of the upper surface UF, and a width WD3 and a height HT1 at the base of the left surface LF, and is not provided at the base of the right surface RF. Also, the height HT1 is substantially the same as the thickness DT of one wire, and each of the width WD1, the width WD2, and the width WD3 is substantially the same as the thickness DT of one wire. Further, among the raised portion BM, the lower portion BM1 provided at the base of the lower surface DF is formed so as to gradually increase in height from the end on the Y2 side toward the end on the Y1 side. That is, the lower portion BM1 is formed so as to have a maximum height HT1 at the end on the Y1 side and a minimum height HT2 at the end on the Y2 side.
[0074] And the wire forming the front coil 3F is wound around the front coil support portion 14F so as to form eight winding layers WL (front winding layer WLF), as shown in FIG. 15. Specifically, the front coil 3F is configured such that each of the odd-numbered layers, i.e., the first layer WLF1, the third layer WLF3, the fifth layer WLF5, and the seventh layer WLF7, includes six front wire annular portions WF, and each of the even-numbered layers, i.e., the second layer WLF2, the fourth layer WLF4, the sixth layer WLF6, and the eighth layer WLF8, includes five front wire annular portions WF.
[0075] Also, as shown in the upper diagram of FIG. 16, the first layer WLF1 of the wire forming the front coil 3F is configured to achieve aligned winding of six front wire annular portions WF (first front wire annular portion WF11 to sixth front wire annular portion WF16) on the Z1 side of the front coil support portion 14F. Specifically, the first layer WLF1 of the wire forming the front coil 3F is configured such that the end point WF11E of the first front wire annular portion WF11 and the start point WF12S of the second front wire annular portion WF12 are connected on the Z1 side of the central front support protrusion 14FM. The same applies to the connection between the end point of the second front wire annular portion WF12 and the start point of the third front wire annular portion WF13.
[0076] Also, as shown in the lower diagram of FIG. 16, the second layer WLF2 of the wire forming the front coil 3F is configured to achieve aligned winding of five front wire annular portions WF (first front wire annular portion WF21 to fifth front wire annular portion WF25) on the Z1 side of the front coil support portion 14F. Specifically, the second layer WLF2 of the wire forming the front coil 3F is configured such that the end point WF16E of the sixth front wire annular portion WF16 of the first layer WLF1 and the start point WF21S of the first front wire annular portion WF21 of the second layer WLF2 are connected on the Z1 side of the central front support protrusion 14FM. The same applies to the connection between the end point of the first front wire annular portion WF21 of the second layer WLF2 and the start point of the second front wire annular portion WF22 of the second layer WLF2.
[0077] This configuration realizes the stabilization of the shape of the front coil 3F and brings about the effect that winding disorder is less likely to occur.
[0078] Next, referring to FIG. 17, a lens holding member 2A, which is another configuration example of the lens holding member 2, will be described. FIG. 17 is a front view of the lens holding member 2A and corresponds to the lower diagram of FIG. 12, which is a front view of the lens holding member 2.
[0079] The lens holding member 2A is different from the lens holding member 2 in that the front recess 2RF is formed on the Y1 side of the right front support protrusion 14FR on the front coil arrangement surface 2CF, while the front recess 2RF is formed on the Y1 side of the central front support protrusion 14FM.
[0080] Specifically, in the lens holding member 2A, the wire forming the front coil 3F forms a winding start end 13FS at the upper left corner of the right front support protrusion 14FR and is wound around the front coil support portion 14F clockwise in a front view, and forms an inclination start portion TS at the lower right corner of the right front support protrusion 14FR. That is, the first front wire annular portion WF11 constituting the first layer WLF1 of the front coil 3F is arranged such that, as in the case of the lens holding member 2, the right end portion is located on the X1 side surface of the front coil arrangement surface 2CF, while the left end portion is located on the X1 side surface of the raised portion BM. Therefore, the first front wire annular portion WF11 is wound around the front coil support portion 14F so as to be displaced toward the X1 side as it extends from the Y2 side to the Y1 side.
[0081] With such a configuration, the wire wound around the lens holding member 2A can be suppressed from generating winding disorder of the wire forming the front coil 3F, similar to the case of the lens holding member 2. Further, since the wire forming the front coil 3F is not drawn out from the transition portion TR to the relay portion 3J, winding disorder is less likely to occur, and loosening of the relay portion 3J is also less likely to occur.
[0082] As described above, as shown in FIG. 2, the lens driving device 101 according to the present embodiment includes a lens holding member 2 having a cylindrical portion 12 capable of holding a lens body LS, a support member (leaf spring 6) that supports the lens holding member 2 so as to be movable in the optical axis direction, a first coil (front coil 3F), a second coil (rear coil 3B), and a coil member 3 formed of a wire (conductive wire) in which a relay portion 3J that connects the first coil (front coil 3F) and the second coil (rear coil 3B) in series is continuous, and a first magnet (front magnet 5F) and a second magnet (rear magnet 5B) that face the first coil (front coil 3F) and the second coil (rear coil 3B), respectively. The lens holding member 2 includes a first holding portion (front holding portion 72F) provided on one end side (Z1 side) of the cylindrical portion 12 in the optical axis direction for holding one end portion of the wire, a second holding portion (rear holding portion 72B) for holding the other end portion, a first coil arrangement surface (front coil arrangement surface 2CF) provided on one of two outer surfaces facing each other across the optical axis OA on which the first coil (front coil 3F) is arranged, a second coil arrangement surface (rear coil arrangement surface 2CB) provided on the other of the two outer surfaces facing each other across the optical axis OA on which the second coil (rear coil 3B) is arranged, a relay surface 2J located between the first coil arrangement surface (front coil arrangement surface 2CF) and the second coil arrangement surface (rear coil arrangement surface 2CB) and facing the relay portion 3J, a first coil support portion (front coil support portion 14F) on which a first wire annular portion (front wire annular portion WF) that protrudes outward (X1 side) from the first coil arrangement surface (front coil arrangement surface 2CF) and constitutes the first coil (front coil 3F) is wound, and a second coil support portion (rear coil support portion 14B) on which a second wire annular portion (rear wire annular portion WB) that protrudes outward (X2 side) from the second coil arrangement surface (rear coil arrangement surface 2CB) and constitutes the second coil (rear coil 3B) is wound. As shown in FIG. 6, the first coil support portion (front coil support portion 14F) includes a first support protrusion (right front support protrusion 14FR), a second support protrusion (left front support protrusion 14FL), which are arranged side by side with a space therebetween in the extending direction (Y-axis direction) of the first wire annular portion (front wire annular portion WF) perpendicular to the optical axis direction, and an intermediate support protrusion (central front support protrusion 14FM) located between the first support protrusion (right front support protrusion 14FR) and the second support protrusion (left front support protrusion 14FL).The first coil (front coil 3F) has a portion where a wire (front extending portion 33F) extending from the first holding portion (front holding portion 72F) is bent to one side (Y2 side, which is the side away from the second support protrusion (left front support protrusion 14FL)) in the extending direction (Y-axis direction) by the first support protrusion (right front support protrusion 14FR) or the intermediate support protrusion (central front support protrusion 14FM) as the starting end 13FS of the first turn (the first front wire annular portion WF11 which is the first winding) and is wound around the first coil support portion (front coil support portion 14F). At the base of the second support protrusion (left front support protrusion 14FL), a raised portion BM is provided on the extension line EL of the first wire annular portion (the first front wire annular portion WF11) extending from the starting end 13FS of the first turn (the first front wire annular portion WF11).
[0083] This configuration brings about the effect of being able to hardly cause winding disorder of the wire constituting the coil member 3. At the position corresponding to the transition portion TR from the first turn to the second turn, the raised portion BM is provided so as to fill the gap GP between the wire annular portion of the first turn (the first front wire annular portion WF11) and the lens holding member 2 (coil arrangement surface 2C). This is because it can suppress the first wire annular portion of the first turn (the first front wire annular portion WF11) from moving in the axial direction (X-axis direction) of the coil axis or other front wire annular portions WF (for example, the front wire annular portions WF constituting the second layer WLF2) from entering the gap GP. Therefore, this configuration brings about the effect of being able to suppress the wire constituting the coil member 3 from coming into contact with other members in the vicinity or the distance between the coil member 3 and the magnet 5 from varying.
[0084] Also, the raised portion BM is preferably connected to each of the first coil arrangement surface (front coil arrangement surface 2CF) and the second support protrusion (left front support protrusion 14FL) as shown in the left figure of FIG. 15. And the protruding amount (height HT1) of the raised portion BM (the portion located on the extension line EL) protruding from the first coil arrangement surface (front coil arrangement surface 2CF) to the X1 side is preferably substantially the same as the thickness DT of one wire.
[0085] As shown in the upper diagram of FIG. 16, this configuration has the effect that the end point WF11E of the first front wire annular portion WF11 in the first turn, which is supported by the second support protrusion (left front support protrusion 14FL), can be aligned with the start point WF12S of the second front wire annular portion WF12 in the second turn, which is supported by the intermediate support protrusion (central front support protrusion 14FM).
[0086] Further, as shown in FIG. 14, the raised portion BM is preferably provided at the base of each of the first surface (lower surface DF) located on one end side (Z2 side) in the optical axis direction (Z-axis direction) of the second support protrusion (left front support protrusion 14FL), the second surface (upper surface UF) located on the other end side (Z1 side) in the optical axis direction (Z-axis direction), and the third surface (left surface LF) located on the side (Y1 side) far from the intermediate support protrusion (central front support protrusion 14FM).
[0087] This configuration has the effect of further reducing the occurrence of winding disorder of the wire constituting the coil member 3. This is because, as shown in the lower diagram of FIG. 6, the gap GP formed between the first front wire annular portion WF11 in the first turn and the lens holding member 2 (front coil arrangement surface 2CF) can be reduced. Further, this configuration enables the transition portion TR from the first turn to the second turn of the wire constituting the front coil 3F to be formed in the range ZN3 which corresponds to the lower long side of the front coil 3F, and has the effect of suppressing the influence of the winding disorder of the wire that may occur at the transition portion TR on the loosening or the like of the relay portion 3J extending from the upper right corner of the first support protrusion (right front support protrusion 14FR) toward the second coil (rear coil 3B).
[0088] Also, as shown in FIG. 14, the protruding amounts (widths WD1 to WD3) of the raised portions BM protruding from each of the first surface (lower surface DF), the second surface (upper surface UF), and the third surface (left surface LF) of the second support protrusion (left front support protrusion 14FL) are preferably substantially the same as the thickness DT of the wire. Further, the protruding amount (height HT1) of the raised portion BM provided on the first surface (lower surface DF) from the first coil arrangement surface (front coil arrangement surface 2CF) is preferably substantially the same as the thickness DT of the wire at a position close to the third surface (left surface LF), and is smaller than the thickness DT of the wire at a position away from the third surface (left surface LF). In the illustrated example, the protruding amount (height HT1) has a minimum value (height HT2) at a position away from the third surface (left surface LF). Also, a part of the first front wire annular portion WF11 of the first turn is located outside (X1 side) of the raised portion BM, as shown in the lower diagram of FIG. 6.
[0089] As shown in the lower diagram of FIG. 6, this configuration has the effect of being able to reduce the gap GP formed between the first front wire annular portion WF11 of the first turn and the lens holding member 2 (front coil arrangement surface 2CF).
[0090] Also, the raised portion BM provided on the first surface (lower surface DF) preferably includes a portion (lower portion BM1) where the protruding amount (height HT1) from the first coil arrangement surface (front coil arrangement surface 2CF) changes continuously, as shown in FIG. 14.
[0091] This configuration has the effect of facilitating the processing of the raised portion BM as compared with the case where the shape of the raised portion BM is stepped. Also, it has the effect of enhancing the stability of the support of the wire by the raised portion BM.
[0092] Also, the relay portion 3J is preferably arranged to extend from the winding end 13FE of the first coil (front coil 3F) located at one end (Y2 side) of the first coil (front coil 3F) in the extending direction (Y-axis direction) toward the second coil (rear coil 3B), as shown in the lower diagram of FIG. 8.
[0093] This configuration can increase the length of the wire portion between the range (range ZN3) where the transition part TR from the first turn to the second turn is located and the relay part 3J, as shown in the lower diagram of FIG. 13, compared to the case where the lens holding member 2Y shown in the central diagram of FIG. 13 is used. Therefore, even if winding disorder occurs in the range ZN3 where the transition part TR is located, this configuration has the effect of making it difficult for the influence to reach the relay part 3J and suppressing the occurrence of loosening of the relay part 3J.
[0094] Also, the first coil (front coil 3F) preferably has a part where the first wire annular part (first front wire annular part WF11) is bent to one side (Y2 side) in the extending direction (Y-axis direction) by the intermediate support protrusion (central front support protrusion 14FM) as the start end 13FS of the first turn, and is wound around the first coil support part (front coil support part 14F).
[0095] This configuration has the effect of making it even more difficult for winding disorder of the wire forming the first coil (front coil 3F) to occur, compared to the case where the first coil (front coil 3F) is wound around the first coil support part (front coil support part 14F) with a part where the first wire annular part (first front wire annular part WF11) is bent to one side (Y2 side) in the extending direction (Y-axis direction) by the first support protrusion (right front support protrusion 14FR) as the start end 13FS of the first turn. This is because the gap GP formed between the first front wire annular part WF11 of the first turn and the lens holding member 2 (front coil arrangement surface 2CF) can be further reduced. For example, it is because the gap formed on the Z1 side of the intermediate support protrusion (central front support protrusion 14FM) can be eliminated.
[0096] 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, substitutions, etc. 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.
[0097] For example, in the above-described embodiment, the number of intermediate support protrusions (central front support protrusion 14FM) is one, but it may be two or more.
[0098] Also, in the above-described embodiment, the raised portion BM is not provided at the base of the lower surface of the intermediate support protrusion (central front support protrusion 14FM), but it may be provided at the base of the lower surface of the intermediate support protrusion (central front support protrusion 14FM). In this case, the raised portion provided at the base of the lower surface of the intermediate support protrusion (central front support protrusion 14FM) is preferably formed such that the protruding amount (height) in the axial direction (X-axis direction) of the coil axis continuously changes. Further, when the start end 13FS of the first turn is formed at the upper left corner of the first support protrusion (right front support protrusion 14FR), the raised portion BM may be provided not only at the base of the second support protrusion (left front support protrusion 14FL) but also at the base of the upper surface of the intermediate support protrusion (central front support protrusion 14FM).
Explanation of reference numerals
[0099] 1... Leaf spring holding member 1c... Corner portion 1c1... First corner portion 1c2... Second corner portion 1c3... Third corner portion 1c4... Fourth corner portion 1p... Projection 1p1... First projection 1p2... Second projection 1p3... Third projection 1p4... Fourth projection 2, 2A, 2X, 2Y... Lens holding member 2C... Coil arrangement surface 2CB... Rear coil arrangement surface 2CF... Front coil arrangement surface 2J... Relay surface 2p... Protruding portion 2q... Contact portion 2R... Recess 2RB... Rear recess 2RF... Front recess 3... Coil member 3B... Rear coil 3F... Front coil 3J... Relay portion 4... Yoke 4A... Outer wall portion 4B... Upper surface portion 4s... Storage portion 5... Magnet 5B... Rear magnet 5F... Front 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... Base portion 12dh... Depression 12h... Eaves portion 12k... Opening 13... Winding portion 13B... Rear winding portion 13BE... End of winding 13BS... Start of winding 13F... Front winding portion 13FE... End of winding 13FS... Start of winding 14... Coil support portion 14B... Rear coil support portion 14BL... Left rear support projection 14BM... Central rear support projection 14BR... Right rear support projection 14F... Front coil support portion 14FL... Left front support projection 14FM... Central front support projection 14FR... Right front support projection 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 18p... 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... Connection plate portion 26i... Inner portion 26k... Round hole 26L... Lower left leaf spring 26R... Lower right leaf spring 26t... Through hole 33... Extension portion 33B... Rear extension portion 33F... Front extension portion33m ··· Winding portion 52 ··· Protrusion 72 ··· Holding portion 72B ··· Rear holding portion 72F ··· Front holding portion 101 ··· Lens driving device AD ··· Adhesive BM ··· Protrusion BM1 ··· Lower portion CM ··· Camera module DF ··· Bottom surface DM ··· Driving portion EL ··· Extension line FB ··· Fixed-side member GP ··· Gap HS ··· Housing IS ··· Image sensor LF ··· Left surface LS ··· Lens body OA ··· Optical axis RF ··· Right surface SB ··· Substrate SD ··· Solder TR ··· Transition portion TS ··· Inclination start portion UF ··· Upper surface W ··· Wire annular portion WB ··· Rear wire annular portion WB11 ··· First rear wire annular portion WB85 ··· Fifth rear wire annular portion WF ··· Front wire annular portion WF11 ··· First front wire annular portion WF11E ··· End point WF12 ··· Second front wire annular portion WF12S ··· Start point WF13 ··· Third front wire annular portion WF14 ··· Fourth front wire annular portion WF15 ··· Fifth front wire annular portion WF16 ··· Sixth front wire annular portion WF16E ··· End point WF21 ··· First front wire annular portion WF21S ··· Start point WF25 ··· Fifth front wire annular portion WF31 ··· First front wire annular portion WF36 ··· Sixth front wire annular portion WF41 ··· First front wire annular portion WF45 ··· Fifth front wire annular portion WF51 ··· First front wire annular portion WF56 ··· Sixth front wire annular portion WF61 ··· First front wire annular portion WF65 ··· Fifth front wire annular portion WF71 ··· First front wire annular portion WF76 ··· Sixth front wire annular portion WF81 ··· First front wire annular portion WF85 ··· Fifth front wire annular portion WL ··· Winding layer WLF ··· Front winding layer WLF1 ··· First layer WLF2 ··· Second layer WLF3 ··· Third layer WLF4 ··· Fourth layer WLF5 ··· Fifth layer WLF6 ··· Sixth layer WLF7 ··· Seventh layer WLF8 ··· Eighth layer
Claims
1. a lens holding member 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; a coil member provided on the lens holding member, the coil member including a first coil, a second coil, and a relay portion connecting the first coil and the second coil in series, the relay portion being formed of a continuous wire; a first magnet and a second magnet facing the first coil and the second coil, respectively; the lens holding member has: a first holding portion provided at one end side in the optical axis direction to hold one end of the wire; and a second holding portion to hold the other end; a first coil arrangement surface provided on one of two outer surfaces opposing each other across the optical axis; a second coil arrangement surface provided on the other; a relay surface located between the first coil arrangement surface and the second coil arrangement surface and facing the relay portion; a first coil support portion around which a first annular wire portion that protrudes outward from the first coil arrangement surface and constitutes the first coil is wound; and a second coil support portion around which a second annular wire portion that protrudes outward from the second coil arrangement surface and constitutes the second coil is wound; In a lens driving device, the first coil support portion has a first support protrusion, a second support protrusion, and an intermediate support protrusion located between the first support protrusion and the second support protrusion, the first coil support portion being arranged side by side and spaced apart from each other in an extending direction of the first wire annular portion perpendicular to the optical axis direction, the first coil is wound around the first coil support part, with a portion where the wire extending from the first holding part is bent to one side in the extension direction by the first support protrusion or the intermediate support protrusion as a winding start end of a first turn, A lens driving device characterized in that a protrusion is provided at the base of the second support protrusion, the protrusion being located on an extension line of the first wire loop portion extending from the winding start end of the first turn.
2. the protruding portion is connected to each of the first coil arrangement surface and the second support protrusion, a protrusion amount of the protruding portion protruding from the first coil arrangement surface is substantially the same as a thickness of the wire material; The lens driving device according to claim 1 .
3. The raised portion is provided at the base of each of a first surface located on the one end side in the optical axis direction of the second support protrusion, a second surface located on the other end side in the optical axis direction, and a third surface located on the side farther from the intermediate support protrusion.
3. The lens driving device according to claim 2.
4. The protruding amount of the raised portion protruding from each of the first surface, the second surface, and the third surface of the second support protrusion is substantially the same as the thickness of the wire. The protruding amount of the raised portion provided on the first surface from the first coil arrangement surface is substantially the same as the thickness of the wire at a position close to the third surface, and is smaller than the thickness of the wire at a position away from the third surface. The lens driving device according to claim 3.
5. The raised portion provided on the first surface includes a portion where the protruding amount from the first coil arrangement surface continuously changes. The lens driving device according to claim 4.
6. The relay portion is arranged to extend from the end of winding of the first coil located at one end of the first coil in the extending direction toward the second coil. The lens driving device according to claim 1.
7. The first coil is wound around the first coil support portion with the portion where the first wire annular portion is bent to one side in the extending direction by the intermediate support protrusion as the start end of the first turn. The lens driving device according to claim 1.
8. The lens driving device according to any one of claims 1 to 7, the lens body, and an imaging element facing the lens body. A camera module.
Citation Information
Patent Citations
Lens drive device
WO2018043132A1