Lens drive unit

Abstract

To provide a lens drive capable of suppressing an inclination of a light axis of a lens body.SOLUTION: A lens drive 101 includes a drive mechanism DM for moving a lens holding member 7 relative to a fixed side member FB. The drive mechanism DM includes a magnetic member MG that has a magnetic field generation member 10 and a yoke 9 and is supported movably by a support member SM, and a coil 11 provided in the fixed side member FB so as to oppose the magnetic field generation member 10, and is configured such that the magnetic member MB travels in a light axis direction by energization of the coil 11. The coil 11 includes a left coil 11L and a right coil 11r that can be energized individually. A lens holding member 7 is connected to a left connection member 8L fixed to a left magnetic member MGL in a first position, and is connected to a right connection member 8R fixed to a right magnetic member MGR in a second position. The first position and the second position oppose mutually while sandwiching a light axis OA.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a lens driving device mounted in, for example, a mobile device with a camera. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a lens holder driving device (lens driving device) including a lens holder supported by an upper leaf spring and a lower leaf spring so as to be movable in the optical axis direction is known (see Patent Document 1).

[0003] This lens driving device is configured so that the lens holder can be moved in the optical axis direction relative to the base member by a VCM type driving mechanism constituted by a driving coil, a yoke, and a permanent magnet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 204-017977 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned lens driving device, depending on the position, the lens holder may tilt, and the optical axis of the lens body may also tilt.

[0006] It is therefore desirable to provide a lens driving device that can suppress the tilt of the optical axis of the lens body. [Means for solving the problem]

[0007] A lens driving device according to an embodiment of the present invention is a lens driving device including a fixed-side member, a lens holding member capable of holding a lens body, a movable-side member including the lens holding member, and a driving mechanism for moving the lens holding member at least in an optical axis direction relative to the fixed-side member, wherein the driving mechanism has at least two driving sections including a first driving section and a second driving section arranged to face each other across the optical axis, the first driving section includes a first magnetic member having a first magnetic field generating member and a first yoke, and supported by a support member so as to be movable in the optical axis direction, and a first coil provided on the fixed-side member to face the first magnetic field generating member, and the first magnetic field generating member is driven by energizing the first coil. The magnetic member is configured to move in the optical axis direction, the second driving unit includes a second magnetic member having a second magnetic field generating member and a second yoke and supported by the support member so as to be movable in the optical axis direction, and a second coil provided on the fixed side member so as to face the second magnetic field generating member, the second magnetic member is configured to move in the optical axis direction by energizing the second coil, the first coil and the second coil can be energized separately, the lens holding member is connected at a first position to a first connecting member fixed to the first magnetic member and is connected at a second position to a second connecting member fixed to the second magnetic member, the first connecting member being The metal member is elastically deformable. The lens holding member and the first magnetic member are connected to each other so that they do not come into contact with each other, and the second connecting member is The metal member is elastically deformable. The lens holding member and the second magnetic member are connected so that they do not come into contact with each other, and the first position and the second position face each other across the optical axis. Effect of the Invention

[0008] The above-described lens driving device can suppress tilt of the optical axis of the lens body. [Brief description of the drawings]

[0009] [Figure 1A]FIG. 2 is a top perspective view of the lens driving device. [Figure 1B] FIG. 2 is a top perspective view of the lens driving device with a cover member removed. [Diagram 2] FIG. 2 is an exploded perspective view of the lens driving device. [Figure 3A] FIG. [Figure 3B] FIG. [Figure 4A] FIG. 2 is a top perspective view of the coil assembly. [Figure 4B] FIG. [Figure 5A] FIG. 4 is a top perspective view of a movable member to which a support member is attached. [Figure 5B] FIG. 4 is a bottom perspective view of the movable member to which the support member is attached. [Figure 6A] FIG. 4 is a top perspective view of a coil holding member to which a support member for supporting a movable member is attached. [Figure 6B] FIG. 4 is a bottom perspective view of the coil holding member to which the support member for supporting the movable member is attached. [Figure 7A] FIG. 2 is a top perspective view of a coil holding member to which a coil assembly is attached. [Figure 7B] FIG. 4 is a bottom perspective view of the coil holding member to which the coil assembly is attached. [Figure 8A] FIG. [Figure 8B] FIG. [Figure 8C] FIG. [Figure 9A] FIG. [Figure 9B] FIG. [Figure 9C] FIG. [Figure 10] FIG. [Figure 11A] 4 is a right side view of the right yoke, the right magnetic field generating member, the right coil, and the right magnetic detection member when the lens driving device is in an initial state. FIG. [Figure 11B]13 is a right side view of the right yoke, the right magnetic field generating member, the right coil, and the right magnetic detection member when the right yoke and the right magnetic field generating member have moved downward. FIG. [Figure 11C] 13 is a right side view of the right yoke, the right magnetic field generating member, the right coil, and the right magnetic detection member when the right yoke and the right magnetic field generating member have moved upward. FIG. [Figure 12A] 4 is a front view of the lens holding member, the connecting member, and the yoke. FIG. [Figure 12B] 13 is a front view of the lens holding member, the connecting member, and the yoke when the optical axis is tilted. FIG. [Figure 13A] 4 is a top view of the base member, the coil holding member, and the yoke. FIG. [Figure 13B] FIG. 2 is a top perspective view of a base member, a coil holding member, and a yoke. [Figure 14A] FIG. 2 is a perspective view of a yoke with a workpiece attached thereto; [Figure 14B] FIG. 2 is a perspective view of a yoke having a connecting member attached thereto. [Figure 14C] FIG. 2 is a perspective view of a yoke to which a connecting member and a magnetic field generating member are attached. [Figure 14D] FIG. 2 is a perspective view of a yoke with a connecting member, a magnetic field generating member, and an adhesive attached thereto. [Figure 15A] FIG. 4 is a top view of the coil holding member and the coil. [Figure 15B] 4 is a cross-sectional view of a coil holding member and a coil. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A lens driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. Figures 1A and 1B are perspective views of the lens driving device 101. Specifically, Figure 1A is an upper perspective view of the lens driving device 101 with a cover member 1 attached, and Figure 1B is an upper perspective view of the lens driving device 101 with the cover member 1 removed. Figure 2 is an exploded perspective view of the lens driving device 101.

[0011] In FIG. 1A, 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. 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 this embodiment, the optical axis OA extends parallel to the Z axis. The X1 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (rear side) of the lens driving device 101. 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. Moreover, the Z1 side of the lens driving device 101 corresponds to the upper side of the lens driving device 101, and the Z2 side of the lens driving device 101 corresponds to the lower side of the lens driving device 101. The same applies to the other figures.

[0012] The lens driving device 101 is a device for driving a lens body (not shown). In this embodiment, the lens driving device 101 is configured to move the lens body in an optical axis direction by using a driving mechanism DM. The optical axis direction includes the direction of the optical axis OA with respect to the lens body and a direction parallel to the optical axis OA.

[0013] 1B, the drive mechanism DM includes a left drive unit DML as a first drive unit and a right drive unit DMR as a second drive unit, which are arranged to face each other across the optical axis OA. In this embodiment, the left drive unit DML and the right drive unit DMR are configured to have the same shape and are arranged to be symmetrical in a top view.

[0014] The cover member 1 is configured to function as a housing HS that covers each of the components. In this embodiment, the cover member 1 constitutes the housing HS together with the base member 2. The housing HS is a part of the fixed side member FB. The cover member 1 is produced by subjecting a plate material made of a non-magnetic metal such as austenitic stainless steel to punching, drawing, and the like.

[0015] Specifically, the cover member 1 has a rectangular cylindrical outer wall portion 1A, a rectangular annular flat upper plate portion 1B provided so as to be continuous with the upper end (Z1 side end) of the outer wall portion 1A, a cylindrical wall portion 1C extending upward from the inner edge of the upper plate portion 1B, and an annular plate portion 1D provided so as to be continuous with the upper end (Z1 side end) of the cylindrical wall portion 1C. A circular opening 1K is formed in the center of the annular plate portion 1D. The outer wall portion 1A includes a first side plate portion 1A1 to a fourth side plate portion 1A4. The first side plate portion 1A1 and the third side plate portion 1A3 face each other, and the second side plate portion 1A2 and the fourth side plate portion 1A4 face each other. The first side plate portion 1A1 and the third side plate portion 1A3 extend perpendicularly to the second side plate portion 1A2 and the fourth side plate portion 1A4. The upper plate portion 1B is not limited to a flat plate shape, and may have a recess or a projection. The cylindrical wall portion 1C and the annular plate portion 1D may be omitted.

[0016] Next, each member housed in the housing HS will be described with reference to Fig. 2. Fig. 2 is an exploded perspective view of the lens driving device 101.

[0017] As shown in FIG. 2, the lens driving device 101 includes a movable side member MB, a fixed side member FB, and a support member SM arranged between the movable side member MB and the fixed side member FB and supporting the movable side member MB so that it can move in the optical axis direction relative to the fixed side member FB.

[0018] The movable member MB is a member configured to be movable relative to the fixed member FB. In the example shown in Fig. 2, the movable member MB includes a lens holding member 7, a connecting member 8, and a magnetic member MG. The magnetic member MG includes a yoke 9 and a magnetic field generating member 10.

[0019] Here, the movable member MB will be described in detail with reference to Fig. 3A and Fig. 3B. Fig. 3A and Fig. 3B are diagrams showing an example of the configuration of the movable member MB. Specifically, Fig. 3A is a perspective view of the movable member MB, and Fig. 3B is an exploded perspective view of the movable member MB.

[0020] The lens holding member 7 is configured to hold a lens body. The lens body is, for example, a cylindrical lens barrel having at least one lens. The lens body may be a liquid lens.

[0021] In this embodiment, the lens holding member 7 is produced by injection molding a synthetic resin such as liquid crystal polymer (LCP). Specifically, the lens holding member 7 has a cylindrical portion 7P having a cross section that is circular on the inside and octagonal on the outside when viewed from above. A lens body (not shown) is fitted into the cylindrical portion 7P and fixed to the lens holding member 7 by an adhesive placed between the inner peripheral surface of the cylindrical portion 7P and the outer peripheral surface of the lens body.

[0022] As shown in Fig. 3A, a protrusion 7T is formed at the upper end of the lens holding member 7, protruding radially outward from the cylindrical portion 7P. Then, as shown in Fig. 3B, a through hole 7H for receiving the upper end of the connecting member 8 is formed in the protrusion 7T. Specifically, the protrusion 7T includes a left protrusion 7TL protruding to the left (Y1 direction) and a right protrusion 7TR protruding to the right (Y2 direction). Then, the through hole 7H includes a left through hole 7HL formed in the left protrusion 7TL and a right through hole 7HR formed in the right protrusion 7TR.

[0023] The magnetic member MG is a member that constitutes the drive mechanism DM. The drive mechanism DM is configured to be able to move the movable member MB along the optical axis direction relative to the fixed member FB. In this embodiment, the magnetic member MG includes a yoke 9 and a magnetic field generating member 10, as shown in FIG. 3. Specifically, the magnetic member MG includes a left magnetic member MGL that constitutes the left drive unit DML, and a right magnetic member MGR that constitutes the right drive unit DMR. The left magnetic member MGL includes a left yoke 9L and a left magnetic field generating member 10L, and the right magnetic member MGR includes a right yoke 9R and a right magnetic field generating member 10R.

[0024] The connecting member 8 is a member for connecting the lens holding member 7 and the magnetic member MG. In the example shown in FIG. 3, the connecting member 8 is an elastically deformable plate-shaped metal member (leaf spring). Specifically, the connecting member 8 includes a left connecting member 8L and a right connecting member 8R. The left connecting member 8L has its upper end inserted into a left through-hole 7HL formed in the left protruding portion 7TL of the lens holding member 7, and is fixed to the left protruding portion 7TL by an adhesive AD1. Similarly, the right connecting member 8R has its upper end inserted into a right through-hole 7HR formed in the right protruding portion 7TR of the lens holding member 7, and is fixed to the right protruding portion 7TR by an adhesive AD1. In addition, the left connecting member 8L is fixed to the left yoke 9L by welding, and the right connecting member 8R is fixed to the right yoke 9R by welding. A figure G8 indicated by a dotted line in FIG. 3B indicates the position of the connecting member 8 when attached to the yoke 9. Specifically, the figure G8 includes a figure G8L and a figure G8R. A graphic G8L indicates the position of the left connecting member 8L when attached to the left yoke 9L, and a graphic G8R indicates the position of the right connecting member 8R when attached to the right yoke 9R.

[0025] The yoke 9 is a member that constitutes a magnetic circuit together with the magnetic field generating member 10. In the example shown in Fig. 3, the yoke 9 is produced by subjecting a plate material made of a soft magnetic material such as iron to punching, bending, and the like.

[0026] Specifically, the yoke 9 includes an inner plate portion 9i located closer to the optical axis OA, an outer plate portion 9e located farther from the optical axis OA and arranged to face the inner plate portion 9i, and a connecting portion 9c connecting the upper end of the inner plate portion 9i to the upper end of the outer plate portion 9e. Specifically, the left yoke 9L includes a left inner plate portion 9iL located closer to the optical axis OA, a left outer plate portion 9eL located farther from the optical axis OA and arranged to face the left inner plate portion 9iL, and a left connecting portion 9cL connecting the upper end of the left inner plate portion 9iL to the upper end of the left outer plate portion 9eL. Similarly, the right yoke 9R includes a right inner plate portion 9iR located closer to the optical axis OA, a right outer plate portion 9eR located farther from the optical axis OA and arranged to face the right inner plate portion 9iR, and a right connecting portion 9cR connecting the upper end of the right inner plate portion 9iR to the upper end of the right outer plate portion 9eR.

[0027] The magnetic field generating member 10 is a member that constitutes a magnetic circuit together with the yoke 9. In the example shown in Fig. 3, the magnetic field generating member 10 is composed of a bipolar magnetized permanent magnet.

[0028] Specifically, the magnetic field generating member 10 includes a left magnetic field generating member 10L and a right magnetic field generating member 10R. The left magnetic field generating member 10L is composed of two permanent magnets (an upper left magnet 10LU and a lower left magnet 10LD), and the right magnetic field generating member 10R is composed of two permanent magnets (an upper right magnet 10RU and a lower right magnet 10RD).

[0029] In Fig. 3B, for clarity, a cross pattern is applied to the north pole of each of the upper left magnet 10LU, the lower left magnet 10LD, the upper right magnet 10RU, and the lower right magnet 10RD, and a dot pattern is applied to the south pole of each of them. The same is true for other figures illustrating the polarities of each of the upper left magnet 10LU, the lower left magnet 10LD, the upper right magnet 10RU, and the lower right magnet 10RD.

[0030] As shown in FIG. 3A, the left magnetic field generating member 10L is fixed with an adhesive to the inner surface (the surface facing the left outer plate portion 9eL) of the left inner plate portion 9iL of the left yoke 9L, and the right magnetic field generating member 10R is fixed with an adhesive to the inner surface (the surface facing the right outer plate portion 9eR) of the right inner plate portion 9iR of the right yoke 9R.

[0031] As shown in FIG. 2, the fixed member FB includes a cover member 1, a base member 2, a coil holding member 6, and a coil assembly CA.

[0032] The base member 2 is produced by injection molding using a synthetic resin such as a liquid crystal polymer. In this embodiment, the base member 2 is a member having a rectangular frame-like outer shape, and has a substantially circular opening 2K formed in the center, as shown in FIG.

[0033] 1A, the inner surface of the outer peripheral wall 1A of the cover member 1 near its lower end is combined with and positioned on the outer peripheral side surface of the base member 2. The base member 2 is fixed to the cover member 1 by an adhesive AD0, and together with the cover member 1, forms the housing HS.

[0034] The coil holding member 6 is configured to be able to hold the coil assembly CA. In this embodiment, the coil holding member 6 is produced by injection molding using a synthetic resin such as a liquid crystal polymer. Specifically, as shown in Fig. 2, the coil holding member 6 has a rectangular frame-like outer shape and has a substantially rectangular opening 6K formed in the center.

[0035] Here, with reference to Fig. 4, the coil assembly CA held by the coil holding member 6 will be described in detail. Fig. 4 is a diagram showing an example of the configuration of the coil assembly CA. Specifically, Fig. 4A is a perspective view of the coil assembly CA, and Fig. 4B is an exploded perspective view of the coil assembly CA. The coil assembly CA includes a circuit board 3, a coil 11, a magnetic detection member 12, a capacitor 13, and a reinforcing member 14.

[0036] The circuit board 3 is a board on which a wiring pattern is formed for connecting the coil 11, the magnetic detection member 12, the capacitor 13, etc. to an external device such as a control device (not shown). In the example shown in Fig. 4, the circuit board 3 is a flexible printed circuit board configured to be capable of being repeatedly deformed. However, the circuit board 3 may also be a rigid circuit board.

[0037] Specifically, the circuit board 3 includes a left extending portion 3L extending along the first side plate portion 1A1 of the outer circumferential wall portion 1A of the cover member 1, a rear extending portion 3B extending along the second side plate portion 1A2, and a right extending portion 3R extending along the third side plate portion 1A3. Note that the left extending portion 3L, the rear extending portion 3B, and the third side plate portion 1A3 may be configured as individual circuit boards.

[0038] The coil 11 is formed by winding a conductive (metallic) wire (conductor). In the example shown in FIG. 4, the coil 11 includes a winding portion 11m as a coil main body formed by winding in a substantially octagonal ring shape, and a first extension portion 11s and a second extension portion 11e extending from the winding portion 11m and soldered to the circuit board 3. For clarity, FIG. 4 omits the illustration of the detailed winding state of the conductive wire having a surface covered with an insulating member for the winding portion 11m. That is, the winding portion 11m is illustrated in a simplified manner. The same is true for other figures illustrating the winding portion 11m. The first extension portion 11s is connected to an end portion (winding start portion) of the winding portion 11m located on the inner periphery side of the winding portion 11m at the winding start side of the coil 11. The second extending portion 11e is connected to an end portion (winding end portion) of the winding portion 11m located on the winding end side of the coil 11 and on the outer circumferential side of the winding portion 11m.

[0039] Specifically, the coil 11 includes a left coil 11L attached to the left extending portion 3L of the circuit board 3, and a right coil 11R attached to the right extending portion 3R of the circuit board 3. The left coil 11L includes a left winding portion 11mL, a first left extending portion 11sL, and a second left extending portion 11eL, and the right coil 11R includes a right winding portion 11mR, a first right extending portion 11sR, and a second right extending portion 11eR. The first right extending portion 11sR is fixed to a first conductor pad PD1 on the right extending portion 3R of the circuit board 3 by solder SD1 (see FIG. 4A), and the second right extending portion 11eR is fixed to a second conductor pad PD2 on the right extending portion 3R of the circuit board 3 by solder SD2 (see FIG. 4A). Similarly, the first left extending portion 11sL and the second left extending portion 11eL are fixed to conductor pads (not visible in FIG. 4) on the left extending portion 3L of the circuit board 3.

[0040] More specifically, the coil 11 is formed to have a coil axis 11x extending in a direction perpendicular to the optical axis direction, as shown in Fig. 4A. That is, the left winding portion 11mL of the left coil 11L has a left coil axis 11xL extending in a direction perpendicular to the optical axis direction, and the right winding portion 11mR of the right coil 11R has a right coil axis 11xR extending in a direction perpendicular to the optical axis direction.

[0041] The magnetic detection member 12 is configured to detect the magnetism generated by the magnetic field generating member 10. In the example shown in Fig. 4, the magnetic detection member 12 is configured to detect the position of the movable member MB (magnetic member MG) by using a Hall element. However, the magnetic detection member 12 may be configured to detect the position of the movable member MB (magnetic member MG) by using a magnetic resistance element such as a Giant Magneto Resistive effect (GMR) element, a Semiconductor Magneto Resistive (SMR) element, an Anisotropic Magneto Resistive (AMR) element, or a Tunnel Magneto Resistive (TMR) element that can detect a magnetic field generated by a magnet.

[0042] Specifically, the magnetic detection member 12 includes a left magnetic detection member 12L for receiving magnetism from the left magnetic field generating member 10L and detecting the position of the left magnetic member MGL in the optical axis direction, and a right magnetic detection member 12R for receiving magnetism from the right magnetic field generating member 10R and detecting the position of the right magnetic member MGR in the optical axis direction.

[0043] The left magnetic detection member 12L is disposed in the left winding portion 11mL of the left coil 11L, and is fixed to the left extension portion 3L of the circuit board 3. Similarly, the right magnetic detection member 12R is disposed in the right winding portion 11mR of the right coil 11R, and is fixed to the right extension portion 3R of the circuit board 3.

[0044] The capacitor 13 is a bypass capacitor that connects the power line and the ground. In the example shown in Fig. 4, the capacitor 13 includes a left capacitor 13L and a right capacitor 13R. The left capacitor 13L is disposed in the left winding part 11mL of the left coil 11L, and is fixed to the left extension part 3L of the circuit board 3. Similarly, the right capacitor 13R is disposed in the right winding part 11mR of the right coil 11R, and is fixed to the right extension part 3R of the circuit board 3.

[0045] An adhesive may be applied to the inside of the winding portion 11m. In this case, the magnetic detection member 12 and the capacitor 13 may be embedded inside the adhesive applied to the inside of the winding portion 11m.

[0046] The reinforcing members 14 are members for reinforcing the circuit board 3. In the example shown in Fig. 4, the reinforcing members 14 are plate-shaped members made of stainless steel, and include a rear reinforcing member 14B, a left reinforcing member 14L, and a right reinforcing member 14R.

[0047] Specifically, the reinforcing member 14 includes a rear reinforcing member 14B fixed to the rear extending portion 3B of the circuit board 3 by an adhesive, a left reinforcing member 14L fixed to the left extending portion 3L of the circuit board 3 by an adhesive, and a right reinforcing member 14R fixed to the right extending portion 3R of the circuit board 3 by an adhesive. Note that in the example shown in Fig. 4, the rear reinforcing member 14B may be omitted.

[0048] The left extending portion 3L and the right extending portion 3R of the circuit board 3 are formed with round holes RH1 for receiving guide pins used to position the coil 11 when fixing the coil 11 to the circuit board 3. Similarly, the left reinforcing member 14L and the right reinforcing member 14R are formed with round holes RH2 for receiving the guide pins.

[0049] Here, the support member SM will be described in detail with reference to Figs. 2 to 7. Fig. 5 is a perspective view of the movable-side member MB to which the support member SM is attached. Specifically, Fig. 5A is an upper perspective view of the movable-side member MB to which the support member SM is attached, and Fig. 5B is a lower perspective view of the movable-side member MB to which the support member SM is attached. Fig. 6 is a perspective view of the coil holding member 6 to which the support member SM supporting the movable-side member MB is attached. Specifically, Fig. 6A is an upper perspective view of the coil holding member 6 to which the support member SM supporting the movable-side member MB is attached, and Fig. 6B is a lower perspective view of the coil holding member 6 to which the support member SM supporting the movable-side member MB is attached. Fig. 7 is a perspective view of the coil holding member 6 to which the coil assembly CA is attached. Specifically, Fig. 7A is an upper perspective view of the coil holding member 6 to which the coil assembly CA is attached, and Fig. 7B is a lower perspective view of the coil holding member 6 to which the coil assembly CA is attached. In addition, in Figs. 6 and 7, for clarity, a dot pattern is added to the coil holding member 6.

[0050] In this embodiment, the support member SM is made of a metal plate mainly made of a copper alloy. Specifically, as shown in Fig. 2, the support member SM includes an upper leaf spring 4 arranged between an upper portion of the movable member MB (yoke 9) and an upper portion of the fixed member FB (coil holding member 6), and a lower leaf spring 5 arranged between a lower portion of the movable member MB (magnetic field generating member 10) and a lower portion of the fixed member FB (coil holding member 6).

[0051] 2 indicates the position of the upper leaf spring 4 when attached to the yoke 9. Specifically, the figure G4 includes figures G4L and G4R. The figure G4L indicates the position of the upper leaf spring 4 (left inner portion 4iL) when attached to the left yoke 9L, and the figure G4R indicates the position of the upper leaf spring 4 (right inner portion 4iR) when attached to the right yoke 9R.

[0052] 2 indicates the position of the magnetic field generating member 10 when attached to the lower leaf spring 5. Specifically, the graphic G10 includes the graphic G10L and the graphic G10R. The graphic G10L indicates the position of the left magnetic field generating member 10L (lower-left magnet 10LD) when attached to the lower leaf spring 5 (left inner portion 5iL), and the graphic G10R indicates the position of the right magnetic field generating member 10R (lower-right magnet 10RD) when attached to the lower leaf spring 5 (right inner portion 5iR).

[0053] As shown in Figure 6, when the coil holding member 6, the movable side member MB, and the support member SM are combined, the support member SM supports the movable side member MB so that the movable side member MB can move in the optical axis direction (Z-axis direction) relative to the coil holding member 6.

[0054] 5A, the upper leaf spring 4 has a generally rectangular annular outer shape in a top view. The upper leaf spring 4 includes an inner portion 4i serving as a first support portion (movable support portion) fixed to the movable member MB (yoke 9), an outer portion 4e serving as a second support portion (fixed support portion) fixed to the fixed member FB (coil holding member 6), an elastic arm portion 4g located between the inner portion 4i and the outer portion 4e, and a crosspiece portion 4r connecting the two outer portions 4e.

[0055] More specifically, the inner portion 4i includes a left inner portion 4iL fixed to the left yoke 9L and a right inner portion 4iR fixed to the right yoke 9R.

[0056] The outer portion 4e of the upper leaf spring 4 is placed on the end faces (upper surfaces) of the four corners of the coil holding member 6 on the subject side (Z1 side), as shown in FIG. 6A. The four corners of the coil holding member 6 are provided with four pedestal portions 6P extending in the vertical direction, as shown in FIG. 7A. The end faces (upper surfaces) of the four pedestal portions 6P on the subject side (Z1 side) are provided with protrusions 6T protruding upward. The protrusions 6T are inserted into the through holes 4H (see FIG. 5A) provided in the outer portion 4e of the upper leaf spring 4. The protrusions 6T are fixed to the outer portion 4e by heat crimping, as shown in FIG. 6A. In FIG. 6A and FIG. 7A, the protrusions 6T are shown in a state in which the tip is deformed after heat crimping. The same is true in other figures showing the protrusions 6T. The protrusions 6T may be cold crimped.

[0057] The inner portion 4i of the upper leaf spring 4 is placed on the connecting portion 9c of the yoke 9 (see FIG. 3B). The inner portion 4i is then fixed to the connecting portion 9c of the yoke 9 by welding. Specifically, as shown in FIG. 5A, the left inner portion 4iL is welded to the upper surface of the left connecting portion 9cL of the left yoke 9L, and the right inner portion 4iR is welded to the upper surface of the right connecting portion 9cR of the right yoke 9R.

[0058] 5B, the lower leaf spring 5 has a generally rectangular annular outer shape in top view. The lower leaf spring 5 includes an inner portion 5i serving as a first support portion (movable support portion) fixed to the movable member MB (magnetic field generating member 10), an outer portion 5e serving as a second support portion (fixed support portion) fixed to the fixed member FB (coil holding member 6), an elastic arm portion 5g located between the inner portion 5i and the outer portion 5e, and a crosspiece portion 5r connecting the two outer portions 5e.

[0059] More specifically, the inner portion 5i includes a left inner portion 5iL fixed to the left magnetic field generating member 10L, and a right inner portion 5iR fixed to the right magnetic field generating member 10R.

[0060] The outer portion 5e of the lower leaf spring 5 is placed on the end faces (lower faces) of the imaging element side (Z2 side) of four pedestal portions 6P provided at the four corners of the coil holding member 6. As shown in Fig. 7B, four recesses 6R recessed upward (Z1 direction) are provided on the end faces (lower faces) of the four pedestal portions 6P on the imaging element side (Z2 side). Then, as shown in Fig. 6B, the outer portion 5e is fixed to the coil holding member 6 by adhesive AD2 applied to the recesses 6R.

[0061] The inner portion 5i of the lower leaf spring 5 is placed on the magnetic field generating member 10 as shown in Fig. 5B. The inner portion 5i is then fixed to the magnetic field generating member 10 by an adhesive. Specifically, as shown in Fig. 5B, the left inner portion 5iL is adhesively fixed to the lower surface of the left lower magnet 10LD of the left magnetic field generating member 10L, and the right inner portion 5iR is adhesively fixed to the lower surface of the right lower magnet 10RD of the right magnetic field generating member 10R.

[0062] 6A, the upper leaf spring 4 is formed to have two-fold rotational symmetry with respect to the optical axis OA. The upper leaf spring 4 is fixed to the movable member MB (yoke 9) at the inner portion 4i, and is fixed to the upper portion of the coil holding member 6 at the outer portion 4e. Therefore, the upper leaf spring 4 can support the movable member MB (lens holding member 7) with respect to the coil holding member 6 in a well-balanced manner.

[0063] Similarly, the lower leaf spring 5 is formed to have two-fold rotational symmetry with respect to the optical axis OA, as shown in Fig. 6B. The lower leaf spring 5 is fixed to the movable member MB (magnetic field generating member 10) at the inner portion 5i, and is fixed to the lower part of the coil holding member 6 at the outer portion 5e. Therefore, the lower leaf spring 5 can support the movable member MB (lens holding member 7) with respect to the coil holding member 6 in a well-balanced manner.

[0064] The lens driving device 101 typically has a substantially rectangular parallelepiped outer shape as shown in FIG. 1A, and is attached onto an external board (not shown) on which an imaging element (not shown) is mounted. The external board, the lens driving device 101, the lens body attached to the movable member MB, and the imaging element mounted on the external board so as to face the lens body constitute a camera module. The coil 11 is connected to a current supply source via the circuit board 3. When a current flows through the coil 11, the driving mechanism DM generates an electromagnetic force along the optical axis direction.

[0065] The lens driving device 101 utilizes this electromagnetic force to move the movable side member MB (lens holding member 7) along the optical axis direction on the Z1 side (subject side) of the imaging element, thereby realizing an automatic focus adjustment function (autofocus function). Specifically, the lens driving device 101 moves the movable side member MB (lens holding member 7) in a direction away from the imaging element to enable macro photography, and moves the movable side member MB (lens holding member 7) in a direction approaching the imaging element to enable infinity photography.

[0066] Next, the details of the drive mechanism DM will be described with reference to Figs. 8 to 10. Figs. 8 and 9 are diagrams showing a configuration example of the right drive unit DMR, which is one of the drive mechanisms DM. Specifically, Fig. 8A is a top view of the right drive unit DMR, Fig. 8B is a left side view of the right drive unit DMR, and Fig. 8C is a bottom view of the right drive unit DMR. Also, Fig. 9A is a front view of the right drive unit DMR, Fig. 9B is a right side view of the right drive unit DMR, and Fig. 9C is a rear view of the right drive unit DMR. Fig. 10 is a cross-sectional view of the right drive unit DMR when a plane parallel to the XZ plane including the dashed dotted line L1 in Fig. 8A is seen from the Y1 side as indicated by the arrow. In Figs. 8 and 9, for clarity, a fine cross pattern is applied to the N pole parts of the upper right magnet 10RU and the lower right magnet 10RD, a dot pattern is applied to the S pole parts of each, and a coarse cross pattern is applied to the right coil 11R. For clarity, the right magnetic field generating member 10R is indicated by a dotted line in Fig. 10. Also, the following description relates to the right driving part DMR, but is similarly applicable to the left driving part DML.

[0067] As shown in FIGS. 8 and 9, the right driving part DMR constituting the driving mechanism DM includes a right yoke 9R, a right magnetic field generating member 10R, and a right coil 11R.

[0068] The right driving unit DMR is configured to generate a driving force (thrust) using the magnetic field generated by the right magnetic field generating member 10R and the current flowing through the right coil 11R, thereby moving the right yoke 9R fixed to the right magnetic field generating member 10R up and down along the optical axis direction.

[0069] The right magnetic field generating member 10R (upper right magnet 10RU and lower right magnet 10RD) has a substantially rectangular parallelepiped shape as shown in Fig. 3. In the initial state of the lens driving device 101, the right magnetic field generating member 10R is fixed with an adhesive to the right inner plate portion 9iR and the right connecting portion 9cR of the right yoke 9R so as to be located inside (on the Y1 side) of the right coil 11R with a gap GP between them as shown in Fig. 8C. The initial state of the lens driving device 101 refers to the state of the lens driving device 101 when no current is supplied to the coil 11.

[0070] In addition, in the initial state of the lens driving device 101, the right magnetic field generating member 10R is fixed with an adhesive to the right inner plate portion 9iR and the right connecting portion 9cR of the right yoke 9R so that its central plane MS is located at a position higher than the right coil axis 11xR by a height HT, as shown in Fig. 9A. The central plane MS corresponds to the boundary surface between the upper right magnet 10RU and the lower right magnet 10RD. That is, the right magnetic field generating member 10R is disposed so that the N pole portion of the upper right magnet 10RU faces the upper straight portion 11RU of the right coil 11R, and the S pole portion of the lower right magnet 10RD faces the lower straight portion 11RD of the right coil 11R, as shown in Fig. 10.

[0071] Furthermore, as shown in FIG. 9B, the right magnetic field generating member 10R is configured so that its length (width W1) in the fore-and-aft direction (X-axis direction) is greater than the length (width W2) in the fore-and-aft direction (X-axis direction) of the right outer plate portion 9eR of the right yoke 9R, and so that width W1 encompasses width W2.

[0072] Furthermore, as shown in FIG. 10, the right magnetic field generating member 10R is configured so that its width W1 is greater than the length (width W3) in the fore-and-aft direction (X-axis direction) of each of the upper straight portion 11RU and the lower straight portion 11RD of the right coil 11R, and so that the width W1 encompasses the width W3.

[0073] The right magnetic field generating member 10R is configured so that the width W1 is smaller than the length (width W4) of the right coil 11R in the front-rear direction (X-axis direction), and the width W4 encompasses the width W1.

[0074] In addition, in the initial state of the lens driving device 101, the right magnetic field generating member 10R is configured so that its length (height H1) in the vertical direction (Z-axis direction) is greater than the length (height H2) in the vertical direction (Z-axis direction) of the right coil 11R, and so that the height H1 includes the height H2.

[0075] Next, referring to FIG. 11, the movement of the right yoke 9R and the right magnetic field generating member 10R realized by the right driving unit DMR will be described. FIG. 11 is a right side view of the right yoke 9R, the right magnetic field generating member 10R, the right coil 11R, and the right magnetic detection member 12R. Specifically, FIG. 11A shows the positional relationship of the right yoke 9R, the right magnetic field generating member 10R, the right coil 11R, and the right magnetic detection member 12R when the lens driving device 101 is in the initial state. FIG. 11B shows the positional relationship of the right yoke 9R, the right magnetic field generating member 10R, the right coil 11R, and the right magnetic detection member 12R when the right yoke 9R and the right magnetic field generating member 10R move downward (Z2 direction). FIG. 11C shows the positional relationship of the right yoke 9R, the right magnetic field generating member 10R, the right coil 11R, and the right magnetic detection member 12R when the right yoke 9R and the right magnetic field generating member 10R move upward (Z1 direction). In Fig. 11, for clarity, a fine cross pattern is applied to the north pole of each of the upper right magnet 10RU and the lower right magnet 10RD, and a dot pattern is applied to the south pole of each of them. In Fig. 11, for clarity, a coarse cross pattern is applied to the right coil 11R, and the circuit board 3 is not shown. In addition, the following description relates to the right drive unit DMR, but is similarly applicable to the left drive unit DML.

[0076] An opening 9K (right opening 9KR) is formed in the right outer plate portion 9eR of the right yoke 9R. The right opening 9KR is formed so that the change in effective magnetic flux density according to the change in the position (height) of the right yoke 9R (right magnetic field generating member 10R) relative to the right magnetic detection member 12R in the optical axis direction becomes large. The "effective magnetic flux density" is the density of the magnetic flux passing through the right magnetic detection member 12R. That is, in a configuration in which the right opening 9KR is formed in the right outer plate portion 9eR of the right yoke 9R, the fluctuation range of the effective magnetic flux density is larger than that in a configuration in which the right opening 9KR is not formed. The fluctuation range of the effective magnetic flux density means, for example, the difference between the effective magnetic flux density when the right magnetic field generating member 10R is at the upper limit position in the optical axis direction and the effective magnetic flux density when the right magnetic field generating member 10R is at the lower limit position in the optical axis direction.

[0077] This configuration increases the output of the right magnetic detection member 12R, thereby improving the detection accuracy of the right magnetic field generation member 10R by the right magnetic detection member 12R. This configuration also increases the resolution of the right magnetic detection member 12R, thereby improving the detection accuracy of the right magnetic field generation member 10R by the right magnetic detection member 12R.

[0078] In this embodiment, as shown in Fig. 11A, the right opening 9KR is configured such that its length (width W11) in the front-rear direction (X-axis direction) is greater than the length (width W12) of the right magnetic detection member 12R in the front-rear direction (X-axis direction), and the width W11 encompasses the width W12. Also, as shown in Fig. 11A, the right opening 9KR is configured such that its length (height H11) in the up-down direction (Z-axis direction) is greater than the length (height H12) of the right magnetic detection member 12R in the up-down direction (Z-axis direction), and the height H11 encompasses the height H12.

[0079] Thus, in this embodiment, when the lens driving device 101 is in the initial state, the right magnetic detection member 12R is positioned to face the right opening 9KR as shown in Fig. 11A. In other words, the right magnetic detection member 12R is positioned so that the entirety of the right magnetic detection member 12R can be seen through the right opening 9KR when viewed from the right side.

[0080] When a current is supplied from the first right extension 11sR of the right coil 11R through the right winding 11mR to the second right extension 11eR, the conductor constituting the right coil 11R receives an upward (Z1) force (a force based on the Lorentz force). The right coil 11R is fixed to the fixed member FB (coil holding member 6) and cannot move upward. Therefore, the movable member MB (right yoke 9R) moves downward due to a reaction force of the force. As a result, the right magnetic detection member 12R is moved to a position where only its lower part is visible through the right opening 9KR (a position where its upper end is hidden behind the right outer plate 9eR and is not visible) as shown in FIG. 11B when viewed from the right side.

[0081] Conversely, when a current is supplied from the second right extension 11eR of the right coil 11R through the right winding portion 11mR to the first right extension 11sR, the conductor constituting the right coil 11R receives a downward (Z2) force (a force based on the Lorentz force). The right coil 11R is fixed to the fixed member FB (coil holding member 6) and cannot move upward. Therefore, the movable member MB (right yoke 9R) moves upward due to a reaction force of the force. As a result, the right magnetic detection member 12R is moved to a position where only its upper portion is visible through the right opening 9KR (where its lower end is hidden behind the right outer plate portion 9eR and is invisible) as shown in FIG. 11C when viewed from the right side.

[0082] In this embodiment, the effective magnetic flux density in the state shown in FIG. 11B is greater than the effective magnetic flux density in the state shown in FIG. 11A. Also, the effective magnetic flux density in the state shown in FIG. 11A is greater than the effective magnetic flux density in the state shown in FIG. 11C. That is, in this embodiment, the lens driving device 101 is configured so that the effective magnetic flux density decreases approximately linearly as the right yoke 9R moves upward (Z1 direction). However, the lens driving device 101 may be configured so that the effective magnetic flux density increases approximately linearly as the right yoke 9R moves upward (Z1 direction). Also, the lens driving device 101 may be configured so that the effective magnetic flux density decreases nonlinearly as the right yoke 9R moves upward (Z1 direction), or so that the effective magnetic flux density increases nonlinearly as the right yoke 9R moves upward (Z1 direction).

[0083] Next, the tilt suppression function by the drive mechanism DM will be described with reference to Fig. 12. The tilt suppression function is a function for suppressing the tilt of the optical axis OA of the lens body. Fig. 12 is a front view of the lens holding member 7, the connecting member 8, and the yoke 9. Specifically, Fig. 12A is a front view of the lens holding member 7, the connecting member 8, and the yoke 9 when the optical axis OA is not tilted (when the optical axis OA is parallel to the Z axis). Fig. 12B is a front view of the lens holding member 7, the connecting member 8, and the yoke 9 when the optical axis OA is tilted (when the optical axis OA is tilted with respect to the Z axis by the tilt angle θ).

[0084] A control device (not shown) of the lens driving device 101 is configured to detect the state of the lens holding member 7 based on the output of the magnetic detection member 12. In this embodiment, the control device is a device that is external to the lens driving device 101. However, the control device may be a device that is attached inside the lens driving device 101, or may be integrated into the magnetic detection member 12.

[0085] For example, the control device detects the position (height) of the left driving unit DML (left yoke 9L) in the up-down direction (Z-axis direction) based on the output of the left magnetic detection member 12L, and detects the position (height) of the right driving unit DMR (right yoke 9R) in the up-down direction (Z-axis direction) based on the output of the right magnetic detection member 12R. Then, based on the heights of the left yoke 9L and the right yoke 9R, the control device detects the state shown in Fig. 12B, that is, the state in which the left yoke 9L is located at a position higher than the right yoke 9R by the height DF. This state corresponds to the state in which the optical axis OA of the lens body is inclined by the inclination angle θ with respect to the Z axis.

[0086] In this case, the control device can bring the tilt angle θ closer to zero by operating at least one of the left drive unit DML and the right drive unit DMR.

[0087] In the example shown in Figure 12B, the control device lowers the left yoke 9L by the left drive unit DML and raises the right yoke 9R by the right drive unit DMR so that the state (posture) of the lens holding member 7 becomes the state (posture) shown in Figure 12A.

[0088] In addition, the control device may bring the inclination angle θ closer to zero by lowering the left yoke 9L using the left drive unit DML without operating the right drive unit DMR, and may bring the inclination angle θ closer to zero by raising the right yoke 9R using the right drive unit DMR without operating the left drive unit DML.

[0089] Alternatively, the control device may bring the inclination angle θ closer to zero by making the amount of lift of the right yoke 9R by the right drive unit DMR greater than the amount of lift of the left yoke 9L by the left drive unit DML. In other words, the control device may bring the inclination angle θ closer to zero while lifting both the left yoke 9L and the right yoke 9R.

[0090] Alternatively, the control device may bring the inclination angle θ closer to zero by making the amount of lowering of the right yoke 9R by the right drive unit DMR smaller than the amount of lowering of the left yoke 9L by the left drive unit DML. In other words, the control device may bring the inclination angle θ closer to zero while lowering both the left yoke 9L and the right yoke 9R.

[0091] Next, a stopper mechanism that limits the movement of the movable member MB will be described with reference to FIG. 13. FIG. 13 is a diagram showing the positional relationship between the base member 2, the coil holding member 6, and the yoke 9. Specifically, FIG. 13A is a top view of the base member 2, the coil holding member 6, and the yoke 9, and FIG. 13B is an upper perspective view of the base member 2, the coil holding member 6, and the yoke 9. In FIG. 13, for clarity, members other than the base member 2, the coil holding member 6, and the yoke 9 are omitted. In FIG. 13, for clarity, a fine dot pattern is applied to the base member 2, a coarse dot pattern is applied to the coil holding member 6, and a cross pattern is applied to the yoke 9.

[0092] 2, four protrusions 2S protruding upward are provided on the surface (upper surface) on the subject side (Z1 side) of the base member 2. Specifically, the protrusions 2S include a left rear protrusion 2SLB, a left front protrusion 2SLF, a right rear protrusion 2SRB, and a right front protrusion 2SRF.

[0093] 2, four protrusions 6S protruding inward are provided at the four corners of the coil holding member 6. Specifically, the protrusions 6S include a left rear protrusion 6SLB, a left front protrusion 6SLF, a right rear protrusion 6SRB, and a right front protrusion 6SRF. The coil holding member 6 is joined to the base member 2 by an adhesive with the lower leaf spring 5 attached to its underside.

[0094] 13, the left rear protrusion 2SLB and the left rear overhang 6SLB are disposed opposite each other in the radial direction of a circle centered on the optical axis OA. Similarly, the left front protrusion 2SLF and the left front overhang 6SLF are disposed opposite each other, the right rear protrusion 2SRB and the right rear overhang 6SRB are disposed opposite each other, and the right front protrusion 2SRF and the right front overhang 6SRF are disposed opposite each other in the radial direction of a circle centered on the optical axis OA.

[0095] The yoke 9 has a contact portion 9S formed so as to come into contact with the overhang portion 6S when the yoke 9 moves along the X-axis direction. That is, the contact portion 9S is formed so as to prevent the overhang portion 6S from coming into direct contact with the magnetic field generating member 10. In this embodiment, the right inner plate portion 9iR of the right yoke 9R has a pair of right contact portions 9SR (a right rear contact portion 9SRB and a right front contact portion 9SRF). Specifically, the right front contact portion 9SRF formed so as to be bent at the front end (end portion on the X1 side) of the right inner plate portion 9iR of the right yoke 9R and extend outward (in the Y2 direction) is arranged so as to come into contact with the rear side surface (face on the X2 side) of the right front overhang portion 6SRF, and the right rear contact portion 9SRB formed so as to be bent at the rear end (end portion on the X2 side) of the right inner plate portion 9iR of the right yoke 9R and extend outward (in the Y2 direction) is arranged so as to come into contact with the front side surface (face on the X1 side) of the right rear overhang portion 6SRB.

[0096] Similarly, the left inner plate portion 9iL of the left yoke 9L has a pair of left contact portions 9SL (a left rear contact portion 9SLB and a left front contact portion 9SLF). Specifically, the left front contact portion 9SLF formed so as to be bent at the front end (end portion on the X1 side) of the left inner plate portion 9iL of the left yoke 9L and extend outward (in the Y1 direction) is arranged so as to be in contact with the rear side surface (face on the X2 side) of the left front overhang portion 6SLF, and the left rear contact portion 9SLB formed so as to be bent at the rear end (end portion on the X2 side) of the left inner plate portion 9iL of the left yoke 9L and extend outward (in the Y1 direction) is arranged so as to be in contact with the front side surface (face on the X1 side) of the left rear overhang portion 6SLB.

[0097] The protrusion 2S and the overhang 6S are configured to function as stoppers that limit excessive movement of the movable member MB in the X-axis direction and the Y-axis direction. Specifically, the right rear protrusion 2SRB is configured so that when the right yoke 9R moves a distance DS1 toward the Y1 side, the Y2 side surface of the right rear protrusion 2SRB comes into contact with the contact surface CF1 (a portion marked with a diagonal line pattern in FIG. 8B) of the right inner plate portion 9iR of the right yoke 9R. The right front protrusion 2SRF is configured so that when the right yoke 9R moves a distance DS1 toward the Y1 side, the Y2 side surface of the right front protrusion 2SRF comes into contact with the contact surface CF2 (a portion marked with a diagonal line pattern in FIG. 8B) of the right inner plate portion 9iR of the right yoke 9R. The same is true for the left rear protrusion 2SLB and the left front protrusion 2SLF.

[0098] The right rear overhang 6SRB is configured so that when the right yoke 9R moves a distance DS2 toward the X2 side, the X1 side surface of the right rear overhang 6SRB comes into contact with the right rear contact portion 9SRB of the right yoke 9R. The right front overhang 6SRF is configured so that when the right yoke 9R moves a distance DS2 toward the X1 side, the X2 side surface of the right front overhang 6SRF comes into contact with the right front contact portion 9SRF of the right yoke 9R. The same is true for the left rear overhang 6SLB and the left front overhang 6SLF.

[0099] Next, a method of assembling the magnetic member MG will be described with reference to Fig. 14. Fig. 14 is a perspective view of members constituting the magnetic member MG (left magnetic member MGL). Specifically, Fig. 14A is a perspective view of a yoke 9 to which a workpiece WP is attached. Fig. 14B is a perspective view of the yoke 9 to which a connecting member 8 is attached. Fig. 14C is a perspective view of the yoke 9 to which a magnetic field generating member 10 is further attached. Fig. 14D is a perspective view of the yoke 9 to which an adhesive AD3 is further attached. Note that the following description relates to the left magnetic member MGL, but is similarly applicable to the right magnetic member MGR.

[0100] The workpiece WP is a metal plate including a connecting member 8 and a frame member 15. Specifically, the workpiece WP includes a left workpiece WPL and a right workpiece WPR (not shown), the left workpiece WPL includes a left connecting member 8L and a left frame member 15L, and the right workpiece WPR includes a right connecting member 8R and a right frame member 15R (not shown).

[0101] The left workpiece WPL is a member used when attaching the left connecting member 8L to the left yoke 9L. In this embodiment, the left workpiece WPL is joined to the left inner plate portion 9iL of the left yoke 9L by welding.

[0102] Fig. 14A shows the state of the left yoke 9L after the left workpiece WPL has been welded. In Fig. 14A, for clarity, a coarse dot pattern is applied to the left frame member 15L, which is a part of the left workpiece WPL. Also, in Figs. 14A to 14D, for clarity, a coarse cross pattern is applied to the left yoke 9L. The round hole RH3 formed in the left frame member 15L is a hole into which a guide pin used for positioning the workpiece WP is inserted.

[0103] The inner plate portion 9i of the yoke 9 is formed with a through-hole 9H. In this embodiment, the through-hole 9H is a round through-hole. However, the through-hole 9H may be a through-hole having another shape such as a square shape, or may be a notch. The through-hole 9H includes a left through-hole 9HL formed in the left inner plate portion 9iL of the left yoke 9L, and a right through-hole 9HR (see FIG. 8B) formed in the right inner plate portion 9iR of the right yoke 9R. Specifically, as shown in FIG. 14A, the left through-hole 9HL is formed in the left inner plate portion 9iL of the left yoke 9L. The left through-hole 9HL includes a left front through-hole 9HLF and a left rear through-hole 9HLB. The left connecting member 8L is disposed so as to be in contact with the surface of the left inner plate portion 9iL between the left front through-hole 9HLF and the left rear through-hole 9HLB, and is welded to the left inner plate portion 9iL at three welding points WD1 to WD3. In Figs. 14A to 14D, for clarity, the welds WD1 to WD3 are marked with fine dot patterns.

[0104] Thereafter, the left workpiece WPL is cut by a cutting device (not shown) such as a cutting laser irradiation device or a cutter. As a result, the left frame member 15L constituting the left workpiece WPL is cut from the left connecting member 8L. Specifically, the left workpiece WPL is cut into the left connecting member 8L and the left frame member 15L at the cutting line CT represented by the broken line in FIG. 14A. The cutting line CT includes the first cutting line CT1 to the third cutting line CT3. That is, the left workpiece WPL is cut at each of the first cutting line CT1 to the third cutting line CT3. More specifically, the upper end of the left connecting member 8L is cut from the left frame member 15L at the first cutting line CT1, the lower front end of the left connecting member 8L is cut from the left frame member 15L at the second cutting line CT2, and the lower rear end of the left connecting member 8L is cut from the left frame member 15L at the third cutting line CT3.

[0105] The left through-hole 9HL is used as a space for realizing cutting by a cutting device such as a cutting laser irradiation device or a cutter. Specifically, the left front through-hole 9HLF is used as a space for realizing cutting at the second cutting line CT2, and the left rear through-hole 9HLB is used as a space for realizing cutting at the third cutting line CT3.

[0106] FIG. 14B shows the state of the left yoke 9L after the left frame member 15L has been separated from the left connecting member 8L.

[0107] The left magnetic field generating member 10L is fitted into the left yoke 9L from the lower side (Z2 side) of the left yoke 9L. Specifically, the left magnetic field generating member 10L is fitted into the left yoke 9L so that the top surface (Z1 side surface) of the upper-left magnet 10LU contacts the ceiling surface (Z2 side surface) of the left coupling portion 9cL of the left yoke 9L, the right side surface (Y2 side surface) of the upper-left magnet 10LU contacts the inner surface (Y1 side surface) of the left inner plate portion 9iL of the left yoke 9L, and the right side surface (Y2 side surface) of the lower-left magnet 10LD contacts the inner surface (Y1 side surface) of the left inner plate portion 9iL of the left yoke 9L.

[0108] In this embodiment, adhesive (not shown) is applied between the upper surface (Z1 side surface) of the upper left magnet 10LU and the ceiling surface (Z2 side surface) of the left connecting portion 9cL of the left yoke 9L, between the front surface (X1 side surface) of the left magnetic field generating member 10L and the inner surface (X2 side surface) of the left front contact portion 9SLF, and between the rear surface (X2 side surface) of the left magnetic field generating member 10L and the inner surface (X1 side surface) of the left rear contact portion 9SLB.

[0109] Fig. 14C shows the state of the left yoke 9L after the left magnetic field generating member 10L has been attached. For clarity, in Fig. 14C and Fig. 14D, a fine cross pattern is applied to the north pole portion of each of the upper left magnet 10LU and the lower left magnet 10LD, and a fine dot pattern is applied to the south pole portion of each of them.

[0110] When the left magnetic field generating member 10L is attached to the left yoke 9L, the lower end BE of the upper left magnet 10LU and the upper end TE of the lower left magnet 10LD are visible through the left through-holes 9HL (the left rear through-hole 9HLB and the left front through-hole 9HLF, respectively).

[0111] At this stage, the left through portion 9HL is used as a space for applying adhesive AD3 between the upper left magnet 10LU and the lower left magnet 10LD, and between the left magnetic field generating member 10L and the left inner plate portion 9iL.

[0112] Fig. 14D shows the state of the left yoke 9L after the adhesive AD3 has been applied, in which a rough dot pattern has been applied for clarity.

[0113] Next, the positional relationship between the coil holding member 6 and the coil 11 will be described with reference to Fig. 15. Fig. 15 is a diagram showing a configuration example of the coil holding member 6 and the coil 11. Specifically, Fig. 15A is a top view of the coil holding member 6 and the coil 11. Fig. 15B is a cross-sectional view of the coil holding member 6 and the coil 11 when a plane parallel to the XZ plane including the dashed line L2 in the top view shown in Fig. 15A is viewed from the Y1 side as indicated by the arrow. In Fig. 15, for clarity, a coarse dot pattern is applied to the coil holding member 6, and a fine dot pattern is applied to the coil 11.

[0114] The right coil 11R has the Y1 inner surfaces of both ends in the X-axis direction (the rear curved portion 11RB and the front curved portion 11RF) adhered and fixed to the right rear overhang portion 6SRB and the right front overhang portion 6SRF with an adhesive. Similarly, the left coil 11L has the Y2 inner surfaces of both ends in the X-axis direction adhered and fixed to the left rear overhang portion 6SLB and the left front overhang portion 6SLF with an adhesive. In other words, the coil assembly CA is fixed to the overhang portion 6S.

[0115] As shown in Fig. 15B, the right coil 11R includes an upper straight portion 11RU, a lower straight portion 11RD, an upper rear inclined portion 11RUB, an upper front inclined portion 11RUF, a lower rear inclined portion 11RDB, a lower front inclined portion 11RDF, a rear curved portion 11RB, and a front curved portion 11RF. That is, the right coil 11R has a shape narrower at both ends than the right coil 11R having an oval shape. The same is true for the left coil 11L.

[0116] This configuration, compared to a case where the right coil 11R has an oval shape, makes it possible to reduce the diameter of the round hole RH4 through which the guide pin passes when attaching the right coil 11R to the right extension portion 3R of the circuit board 3, thereby increasing the degree of freedom in designing the conductor pattern formed on the right extension portion 3R. This is because the space for the round hole RH4 in the right extension portion 3R can be reduced.

[0117] In addition, this configuration has the effect of preventing the thickness of the bottom 6B of the coil holding member 6 from becoming thin, compared to when the right coil 11R has an oval shape. Specifically, this configuration has the effect of preventing the thicknesses of the portions of the bottom 6B facing the lower rear inclined portion 11RDB, the lower front inclined portion 11RDF, the rear curved portion 11RB, and the front curved portion 11RF from becoming thin. In other words, this configuration has the effect of increasing the strength of the bottom 6B by making the bottom 6B of the coil holding member 6 thicker.

[0118] As described above, the lens driving device 101 according to the embodiment of the present invention includes, as shown in FIG. 2, a fixed-side member FB, a lens holding member 7 capable of holding a lens body, a movable-side member MB including the lens holding member 7, and a driving mechanism DM for moving the lens holding member 7 at least in the optical axis direction relative to the fixed-side member FB. The driving mechanism DM has at least two driving units including a left driving unit DML as a first driving unit and a right driving unit DMR as a second driving unit arranged to face each other across the optical axis OA. The left driving unit DML includes a left magnetic member MGL as a first magnetic member having a left magnetic field generating member 10L as a first magnetic field generating member and a left yoke 9L as a first yoke, and supported by a support member SM so as to be movable in the optical axis direction, and a left coil 11L as a first coil provided on the fixed-side member FB to face the left magnetic field generating member 10L. The left magnetic member MGL is configured to move in the optical axis direction by energizing the left coil 11L. Similarly, the right driving unit DMR includes a right magnetic member MGR as a second magnetic member having a right magnetic field generating member 10R and a right yoke 9R as a second yoke, and supported by a support member SM so as to be movable in the optical axis direction, and a right coil 11R as a second coil provided on a fixed side member FB so as to face the right magnetic field generating member 10R. The right magnetic member MGR is configured to move in the optical axis direction by energizing the right coil 11R. The left coil 11L and the right coil 11R can be energized separately. The lens holding member 7 is connected at a first position (left position of the upper end) to a left connecting member 8L as a first connecting member fixed to the left magnetic member MGL, and is connected at a second position (right position of the upper end) to a right connecting member 8R as a second connecting member fixed to the right magnetic member MGR. The first position and the second position face each other across the optical axis OA. In the example shown in FIG. 3, the first position is the position where the left protrusion 7TL is formed, and the second position is the position where the right protrusion 7TR is formed.

[0119] This configuration can achieve not only an autofocus function but also tilt suppression, which suppresses tilt of the lens holding member 7, by adjusting the current flowing through each coil of at least two drive units. Therefore, this configuration can correct the tilt even if the optical axis OA is tilted.

[0120] As shown in Fig. 5A, the left yoke 9L typically includes a left inner plate portion 9iL as a first inner plate portion located closer to the optical axis OA, a left outer plate portion 9eL as a first outer plate portion located farther from the optical axis OA and arranged to face the left inner plate portion 9iL, and a left coupling portion 9cL as a first coupling portion connecting one end portion (upper end portions in the example shown in Fig. 5A) of the left inner plate portion 9iL and the left outer plate portion 9eL in the optical axis direction. Similarly, as shown in Fig. 5B, the right yoke 9R typically includes a right inner plate portion 9iR as a second inner plate portion located closer to the optical axis OA, a right outer plate portion 9eR as a second outer plate portion located farther from the optical axis OA and arranged to face the right inner plate portion 9iR, and a right coupling portion 9cR as a second coupling portion connecting one end portion (upper end portions in the example shown in Fig. 5A) of the right inner plate portion 9iR and the right outer plate portion 9eR in the optical axis direction. The left magnetic field generating member 10L is fixed to the inner surface (the surface facing the left outer plate portion 9eL) of the left inner plate portion 9iL, and the left coil 11L is disposed between the left magnetic field generating member 10L and the left outer plate portion 9eL. Similarly, the right magnetic field generating member 10R is fixed to the inner surface (the surface facing the right outer plate portion 9eR) of the right inner plate portion 9iR, and the right coil 11R is disposed between the right magnetic field generating member 10R and the right outer plate portion 9eR.

[0121] This configuration can improve the thrust of the drive mechanism DM because the yoke 9 can increase the density of the magnetic flux passing through the coil 11.

[0122] The left connecting member 8L is typically a plate-shaped metal member (leaf spring) that is elastically deformable and fixed to the left inner plate portion 9iL of the left yoke 9L. Similarly, the right connecting member 8R is typically a plate-shaped metal member (leaf spring) that is elastically deformable and fixed to the right inner plate portion 9iR of the right yoke 9R. The connecting member 8, which is a plate-shaped metal member (leaf spring), can suppress the influence of the difference in the amount of movement of the two magnetic members MG (the left magnetic member MGL and the right magnetic member MGR) even if the amount of movement is different. In other words, the connecting member 8 can absorb the force generated by the difference in the amount of movement of the two magnetic members MG by its deformation. As shown in FIG. 14A, the left through-portion 9HL is formed as a first through-portion in the left inner plate portion 9iL, and as shown in FIG. 14B, the cut portion CP of the left connecting member 8L is positioned opposite the left through-portion 9HL, and as shown in FIG. 14D, the adhesive AD3 that fixes the left magnetic field generating member 10L to the left inner plate portion 9iL is exposed from the left through-portion 9HL. Similarly, as shown in FIG. 8B, a right through portion 9HR is formed as a second through portion in the right inner plate portion 9iR, and the cutting portion CP (see FIG. 3B) of the right connecting member 8R is positioned opposite the right through portion 9HR, and the adhesive (not shown) that fixes the right magnetic field generating member 10R to the right inner plate portion 9iR is positioned so as to be exposed from the right through portion 9HR.

[0123] 14, this configuration makes it possible to cut the connecting member 8 and apply the adhesive AD3 by utilizing the through-hole 9H. Therefore, this configuration can realize a reduction in size of the lens driving device 101 and improve the productivity of the lens driving device 101, as compared with a case in which, for example, a structure provided for cutting the connecting member 8 and a structure provided for applying the adhesive AD3 are provided separately.

[0124] As shown in FIG. 3, the left magnetic field generating member 10L is composed of two first permanent magnets (upper left magnet 10LU and lower left magnet 10LD). A portion of each of the two first permanent magnets is located corresponding to the left through-hole 9HL. For example, as shown in FIG. 14C, before the adhesive AD3 is applied, the upper left magnet 10LU and the lower left magnet 10LD are arranged to correspond to the left through-hole 9HL so that the lower end BE of the upper left magnet 10LU and the upper end TE of the lower left magnet 10LD are both visible through the left through-hole 9HL. Similarly, as shown in FIG. 3, the right magnetic field generating member 10R is composed of two second permanent magnets (upper right magnet 10RU and lower right magnet 10RD). A portion of each of the two second permanent magnets is located corresponding to the right through-hole 9HR. For example, as shown in FIG. 8B, before the adhesive is applied, the upper right magnet 10RU and the lower right magnet 10RD are each positioned to correspond to the right through-hole 9HR so that the lower end BE of the upper right magnet 10RU and the upper end TE of the lower right magnet 10RD are both visible through the right through-hole 9HR.

[0125] This configuration enables adhesive to be reliably applied between each of the two permanent magnets and the inner plate portion 9i of the yoke 9, thereby providing the advantage that each of the two permanent magnets can be reliably fixed to the yoke 9 with adhesive.

[0126] As shown in FIG. 2, the fixed-side member FB includes a first board (left extension 3L of the circuit board 3) disposed between the left magnetic field generating member 10L and the left outer plate portion 9eL of the left yoke 9L (see FIG. 3B), and a second board (right extension 3R of the circuit board 3) disposed between the right magnetic field generating member 10R and the right outer plate portion 9eR of the right yoke 9R (see FIG. 3B). As shown in FIG. 4, the left coil 11L is formed to have a first winding portion (left winding portion 11mL) having a first coil axis (left coil axis 11xL) extending in a direction perpendicular to the optical axis direction, and is fixed to the first board (left extension 3L of the circuit board 3). A first magnetic detection member (left magnetic detection member 12L) for receiving a magnetic field from the left magnetic field generating member 10L and detecting the position of the left magnetic member MGL in the optical axis direction is located in the left winding portion 11mL and is fixed to the first board (left extension 3L of the circuit board 3). 4, the right coil 11R is formed to have a second winding part (right winding part 11mR) having a second coil axis (right coil axis 11xR) extending in a direction perpendicular to the optical axis direction, and is fixed to a second board (right extension part 3R of circuit board 3). A second magnetic detection member (right magnetic detection member 12R) for receiving a magnetic field from the right magnetic field generating member 10R and detecting the position of the right magnetic member MGR in the optical axis direction is located in the right winding part 11mR, and is fixed to the second board (right extension part 3R of circuit board 3).

[0127] This configuration brings about the effect that feedback control of the position of the magnetic member MG based on the position of the magnetic member MG detected by the magnetic detection member 12 is realized.

[0128] As shown in Fig. 11, a right opening 9KR is formed in a portion of the right outer plate 9eR of the right yoke 9R that corresponds to the right magnetic detection member 12R. Also, a left opening 9KL (see Fig. 3A) is formed in a portion of the left outer plate 9eL of the left yoke 9L that corresponds to the left magnetic detection member 12L.

[0129] This configuration brings about the effect that the change in the magnetic field received by the magnetic detection member 12 in response to a change in the position of the magnetic member MG in the optical axis direction can be made larger, thereby improving the detection accuracy of the position of the magnetic member MG in the optical axis direction.

[0130] As shown in FIG. 7A, the fixed side member FB includes a coil holding member 6 that supports the left coil 11L constituting the left driving part DML and also supports the right coil 11R constituting the right driving part DMR.

[0131] This configuration has the advantage that at least two coils 11 (the left coil 11L and the right coil 11R) are held by one coil holding member 6, making it easier to handle the coil assembly CA.

[0132] As shown in FIG. 5A, the left connecting portion 9cL of the left yoke 9L is a plate-shaped portion connecting the upper ends of the left inner plate portion 9iL and the left outer plate portion 9eL, and the right connecting portion 9cR of the right yoke 9R is a plate-shaped portion connecting the upper ends of the right inner plate portion 9iR and the right outer plate portion 9eR. As shown in FIG. 2, the support member SM includes an upper leaf spring 4 and a lower leaf spring 5. The upper leaf spring 4 is provided between the upper portion of the coil holding member 6 (the upper end surface of the base portion 6P shown in FIG. 7A) and each of the left yoke 9L (left connecting portion 9cL) and the right yoke 9R (right connecting portion 9cR). The lower leaf spring 5 is provided between the lower portion of the coil holding member 6 (the lower end surface of the base portion 6P shown in FIG. 7B) and each of the left magnetic field generating member 10L and the right magnetic field generating member 10R.

[0133] In this configuration, the lower leaf spring 5 is fixed to the driving magnets, the lower left magnet 10LD and the lower right magnet 10RD, thereby achieving the advantage of making the lens driving device 101 more compact than when the lower leaf spring 5 is fixed to the yoke 9 (left yoke 9L and right yoke 9R) like the upper leaf spring 4.

[0134] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications or substitutions may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

[0135] For example, in the above embodiment, the driving mechanism DM is configured to include the left driving unit DML and the right driving unit DMR, but may further include a front driving unit arranged on the front side (X1 side) of the lens holding member 7 and a rear driving unit arranged on the rear side (X2 side) of the lens holding member 7. That is, the driving mechanism DM may include four driving units arranged on the front, rear, left and right sides of the lens holding member 7. The four driving units are preferably configured to have the same shape and are arranged to be four-fold rotationally symmetrical with respect to the optical axis OA in a top view. In this case, the lens driving device 101 can realize the translation of the lens holding member 7 in the Z-axis direction, the rotation around a rotation axis parallel to the X-axis, and the rotation around a rotation axis parallel to the Y-axis. Therefore, the lens driving device 101 can realize the image stabilization function in addition to the automatic focus adjustment function.

[0136] In the above embodiment, the yoke 9 is configured such that the connecting portion 9c connects the upper end of the inner plate portion 9i to the upper end of the outer plate portion 9e, but the connecting portion may be configured to connect the lower end of the inner plate portion 9i to the lower end of the outer plate portion 9e. In this case, the inner portion 5i of the lower leaf spring 5 may be fixed to the lower surface of the connecting portion, and the inner portion 4i of the upper leaf spring 4 may be fixed to the upper surface of the magnetic field generating member 10. In other words, the connecting portion 9c connecting the upper end of the inner plate portion 9i to the upper end of the outer plate portion 9e may be omitted.

[0137] Also, in the above-described embodiment, the opening 9K (see FIG. 11) is configured by one through hole, but it may be configured by multiple through holes, or may be configured by one or multiple cutouts. [Explanation of symbols]

[0138] 1 ··· Cover member 1A ··· Outer peripheral wall portion 1A1 ··· First side plate portion 1A2 ··· Second side plate portion 1A3 ··· Third side plate portion 1A4 ··· Fourth side plate portion 1B ··· Upper plate portion 1C ··· Cylindrical wall portion 1D ··· Annular plate portion 1K ··· Opening 2 ··· Base member 2K ··· Opening 2S ··· Protruding portion 2SLB ··· Left rear protruding portion 2SLF ··· Left front protruding portion 2SRB ··· Right rear protruding portion 2SRF ··· Right front protruding portion 3 ··· Circuit board 3B ··· Rear extending portion 3L ··· Left extending portion 3R ··· Right extending portion 4 ··· Upper side plate spring 4e ··· Outer portion 4g ··· Elastic arm portion 4H ··· Through hole 4i ··· Inner portion 4iL ··· Left inner portion 4iR ··· Right inner portion 4r ··· Cross bar portion 5 ··· Lower side plate spring 5e ··· Outer portion 5g ··· Elastic arm portion 5i ··· Inner portion 5iL ··· Left inner portion 5iR ··· Right inner portion 5r ··· Cross bar portion 6 ··· Coil holding member 6B ··· Bottom portion 6K ··· Opening 6P ··· Pedestal portion 6R ··· Recessed portion 6S ··· Overhanging portion 6SLB ··· Left rear overhanging portion 6SLF ··· Left front overhanging portion 6SRB ··· Right rear overhanging portion 6SRF ··· Right front overhanging portion 6T ··· Protruding portion 7 ··· Lens holding member 7H ··· Through hole 7HL ··· Left through hole 7HR ··· Right through hole 7P ··· Cylindrical portion 7T ··· Protruding portion 7TL ··· Left protruding portion 7TR ··· Right protruding portion 8 ··· Connecting member 8L ··· Left connecting member 8R ··· Right connecting member 9 ··· Yoke 9c ··· Connecting portion 9cL ··· Left connecting portion 9cR ··· Right connecting portion 9e ··· Outer plate portion 9eL ··· Left outer plate portion 9eR ··· Right outer plate portion 9H ··· Through portion 9HL ··· Left through portion 9HLB ··· Left rear through portion 9HLF ··· Left front through portion 9HR ··· Right through portion 9i ··· Inner plate portion 9iL ··· Left inner plate portion 9iR ··· Right inner plate portion 9K ··· Opening 9KL ··· Left opening 9KR ··· Right opening 9L ··· Left yoke 9R ··· Right yoke 9S ··· Contact portion 9SL ··· Left contact portion 9SLB ··· Left rear contact portion 9SLF ··· Left front contact portion 9SR ··· Right contact portion 9SRB ··· Right rear contact portion 9SRF ··· Right front contact portion 10 ··· Magnetic field generating member 10L ··· Left magnetic field generating member 10LD ··· Lower left magnet 10LU ··· Upper left magnet 10R ··· Right magnetic field generating member 10RD ··· Lower right magnet 10RU ··· Upper right magnet11 Coil 11e Second extension part 11eL Second left extension part 11eR Second right extension part 11L Left coil 11m Winding part 11mL Left winding part 11mR Right winding part 11R Right coil 11RB Rear curved part 11RD...Lower linear part 11RDB...Lower rear inclined part 11RDF...Lower front inclined part 11RF...Front curved part 11RU...Upper straight part 11RUB...Upper rear inclined part 11RUF...Upper front inclined part 11s...First extension part 11sL...First left extension part 11sR...1st right extension part 11x...Coil axis 11xL...Left coil shaft 11xR...Right coil shaft 12...Magnetic detection member 12L...Left magnetic detection member 12R...Right magnetic detection member 13...Capacitor 13L...Left capacitor 13R...Right capacitor 14...Reinforcing member 14B...Rear reinforcing member 14L...Left reinforcing member 14R...Right reinforcing member 101...Lens drive unit AD0~AD3...Adhesive CA...Coil assembly CP...Cutting section DM...Drive mechanism DML...Left drive unit DMR...Right drive unit FB...Fixed-side member HS...Housing MB...Movable-side member MG...Magnetic member MGL...Left magnetic member MGR...Right magnetic member MS...Central surface OA...Optical axis PD1...First conductor pad PD2: Second conductive pad RH1 to RH3: Round holes SM: Support member

Claims

1. A fixed member; a lens holding member capable of holding a lens body; a movable member including the lens holding member; a drive mechanism for moving the lens holding member relative to the fixed member at least in the optical axis direction, the driving mechanism has at least two driving units including a first driving unit and a second driving unit arranged to face each other across an optical axis, the first driving unit includes a first magnetic member having a first magnetic field generating member and a first yoke, and supported by a support member so as to be movable in the optical axis direction; and a first coil provided on the fixed member so as to face the first magnetic field generating member, and is configured such that the first magnetic member moves in the optical axis direction when current is applied to the first coil; the second driving unit includes a second magnetic member having a second magnetic field generating member and a second yoke, and supported by the support member so as to be movable in the optical axis direction; and a second coil provided on the fixed member so as to face the second magnetic field generating member, and is configured such that the second magnetic member moves in the optical axis direction when current is applied to the second coil; The first coil and the second coil can be individually energized, the lens holding member is connected at a first position to a first connecting member fixed to the first magnetic member and capable of elastic deformation, and is connected at a second position to a second connecting member fixed to the second magnetic member, the first connecting member is an elastically deformable metal member, and connects the lens holding member and the first magnetic member such that the lens holding member and the first magnetic member do not come into contact with each other; the second connecting member is an elastically deformable metal member, and connects the lens holding member and the second magnetic member so that the lens holding member and the second magnetic member do not come into contact with each other; The first position and the second position face each other across the optical axis. A lens driving device comprising:

2. the first yoke includes a first inner plate portion located closer to the optical axis, a first outer plate portion arranged to face the first inner plate portion and located farther from the optical axis, and a first connecting portion connecting one end portion of the first inner plate portion and one end portion of the first outer plate portion in the optical axis direction, the second yoke includes a second inner plate portion located closer to the optical axis, a second outer plate portion arranged to face the second inner plate portion and located farther from the optical axis, and a second connecting portion connecting one end portion of the second inner plate portion and one end portion of the second outer plate portion in the optical axis direction, the first magnetic field generating member is fixed to an inner surface of the first inner plate portion, and the first coil is disposed between the first magnetic field generating member and the first outer plate portion, The second magnetic field generating member is fixed to an inner surface of the second inner plate portion, and the second coil is disposed between the second magnetic field generating member and the second outer plate portion. The lens driving device according to claim 1 .

3. A fixed member; a lens holding member capable of holding a lens body; a movable member including the lens holding member; a drive mechanism for moving the lens holding member relative to the fixed member at least in the optical axis direction, the driving mechanism has at least two driving units including a first driving unit and a second driving unit arranged to face each other across an optical axis, the first driving unit includes a first magnetic member having a first magnetic field generating member and a first yoke, and supported by a support member so as to be movable in the optical axis direction; and a first coil provided on the fixed member so as to face the first magnetic field generating member, and is configured such that the first magnetic member moves in the optical axis direction when current is applied to the first coil; the second driving unit includes a second magnetic member having a second magnetic field generating member and a second yoke, and supported by the support member so as to be movable in the optical axis direction; and a second coil provided on the fixed member so as to face the second magnetic field generating member, and is configured such that the second magnetic member moves in the optical axis direction when current is applied to the second coil; The first coil and the second coil can be individually energized, the lens holding member is connected at a first position to a first connecting member fixed to the first magnetic member, and is connected at a second position to a second connecting member fixed to the second magnetic member; the first position and the second position face each other across an optical axis, the first yoke includes a first inner plate portion located closer to the optical axis, a first outer plate portion arranged to face the first inner plate portion and located farther from the optical axis, and a first connecting portion connecting one end portion of the first inner plate portion and one end portion of the first outer plate portion in the optical axis direction, the second yoke includes a second inner plate portion located closer to the optical axis, a second outer plate portion arranged to face the second inner plate portion and located farther from the optical axis, and a second connecting portion connecting one end portion of the second inner plate portion and one end portion of the second outer plate portion in the optical axis direction, the first magnetic field generating member is fixed to an inner surface of the first inner plate portion, and the first coil is disposed between the first magnetic field generating member and the first outer plate portion, the second magnetic field generating member is fixed to an inner surface of the second inner plate portion, and the second coil is disposed between the second magnetic field generating member and the second outer plate portion, the first connecting member is an elastically deformable plate-like metal member fixed to the first inner plate portion of the first yoke, The second connecting member is an elastically deformable plate-shaped metal member fixed to the second inner plate portion of the second yoke. A lens driving device comprising:

4. a first through-hole is formed in the first inner plate portion, a cut portion of the first connecting member is positioned opposite to the first through-hole, and an adhesive that fixes the first magnetic field generating member to the first inner plate portion is exposed from the first through-hole, a second through-portion is formed in the second inner plate portion, a cut portion of the second connecting member is positioned opposite to the second through-portion, and an adhesive that fixes the second magnetic field generating member to the second inner plate portion is exposed from the second through-portion; The lens driving device according to claim 3 .

5. the first magnetic field generating member is composed of two first permanent magnets, and a portion of each of the two first permanent magnets is located corresponding to the first through-portion, The second magnetic field generating member is composed of two second permanent magnets, and a portion of each of the two second permanent magnets is located corresponding to the second through-hole.

5. The lens driving device according to claim 4.

6. the fixed-side member includes a first substrate disposed between the first magnetic field generating member and the first outer plate portion, and a second substrate disposed between the second magnetic field generating member and the second outer plate portion, the first coil is formed to have a first winding portion having a first coil axis extending in a direction perpendicular to an optical axis direction, and is fixed to the first substrate; a first magnetic detection member for detecting a position of the first magnetic member in the optical axis direction by receiving a magnetic field from the first magnetic field generating member, the first magnetic detection member being located within the first winding portion and fixed to the first substrate; the second coil is formed to have a second winding portion having a second coil axis extending in a direction perpendicular to the optical axis direction, and is fixed to the second substrate; a second magnetic detection member for detecting a position of the second magnetic member in the optical axis direction by receiving a magnetic field from the second magnetic field generating member, the second magnetic detection member being located within the second winding portion and fixed to the second substrate; 6. The lens driving device according to claim 2,

7. an opening is formed in the first outer plate portion at a portion corresponding to the first magnetic detection member, An opening is formed in the second outer plate portion at a portion corresponding to the second magnetic detection member.

7. The lens driving device according to claim 6.

8. the fixed member has a coil holding member that supports the first coil of the first driving unit and supports the second coil of the second driving unit.

8. The lens driving device according to claim 2, wherein the lens driving device is a lens driving device.

9. the first connecting portion of the first yoke is a plate-like portion connecting upper ends of the first inner plate portion and the first outer plate portion in the optical axis direction, the second connecting portion of the second yoke is a plate-like portion connecting upper ends of the second inner plate portion and the second outer plate portion in the optical axis direction, The support member includes an upper leaf spring and a lower leaf spring; the upper leaf spring is provided between an upper portion of the coil holding member and each of the first connecting portion and the second connecting portion, and The lower leaf spring is provided between a lower portion of the coil holding member and each of the first magnetic field generating member and the second magnetic field generating member. The lens driving device according to claim 8.

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