JP2019008069A - Lens driving device, camera module using the same, and lens driving device manufacturing method - Google Patents

Abstract

To provide a lens driving device that enables one-time process to mutually conduct a leaf spring supporting so as to freely operate a lens holding member on a supporting base, and a conductive plate having a connection terminal to be fixed to the supporting base, to provide a camera module that uses the lens driving device, and to provide a lens driving device manufacturing method.SOLUTION: A leaf spring blank 120 forming a lower part leaf spring and a conductive plate blank 150 forming a conductive plate are overlappedly fixed to a spring fixation surface 41A formed in the supporting base 40. An overlapped part where a first coupling branch part 121a of the leaf spring blank 120 and a second coupling branch part 151 of the conductive plate 150 are overlapped is irradiated with a laser Ls, and is melted together, and thereby the first coupling branch part 121a and the second coupling branch part 151 are welded.SELECTED DRAWING: Figure 12

Description

  In the present invention, a lens holding member on which a coil is mounted is supported on a support base by a pair of lower leaf springs, and the coil is energized via a connection terminal fixed to the support base and the lower leaf spring. The present invention relates to a lens driving device having a structure, a camera module using the lens driving device, and a method of manufacturing the lens driving device.

Patent Document 1 describes an invention related to a lens driving device.
In this lens driving device, a lens support having a coil is supported on a base by rear springs that are a pair of leaf springs. A pair of terminals are supported on the base, and the pair of terminals are electrically connected to the pair of rear springs on a one-to-one basis. The drive current is passed from the terminal to the coil via each rear spring. The lens support is moved in the direction of the optical axis of the lens by the drive current flowing in the coil and the magnetic field from the magnet facing the coil, and this operation focuses the image on the image sensor.

  As described in paragraphs [0050] to [0052], the lens driving device described in Patent Document 1 has a terminal insertion hole formed in the base, and fixes a pair of rear springs to the base. In addition, the terminal connection portion formed on the rear spring is opposed to the terminal insertion hole. Insert the terminal from the rear into the terminal insertion hole of the base, bring one end of the terminal into contact with the terminal connection part of the rear spring, and bond the one end of the terminal and the terminal connection part with a conductive thermosetting adhesive I am letting.

JP 2009-14890 A

  In the lens driving device described in Patent Document 1, the rear spring and the terminal are fixed and made conductive by a conductive thermosetting adhesive, so that it takes time to complete the curing of the adhesive. In addition, since the rear spring and the terminal are cut out from the metal material in separate processes and joined to each other with a thermosetting adhesive, it is necessary to manage the rear spring and the terminal as separate parts. The management of parts is complicated.

  The present invention solves the above-described conventional problems, and can couple a pair of leaf springs to a terminal simultaneously with the cutting step from the connecting branch portion, and improve the reliability of conduction between the leaf spring and the terminal. It is an object of the present invention to provide a lens driving device, a camera module using the lens driving device, and a method of manufacturing the lens driving device.

The present invention provides a support base, a lens holding member on which a lens body can be mounted, and a lens holding member that is provided between the support base and the lens holding member and moves in the optical axis direction of the lens body. A pair of leaf springs that are freely supported, a coil mounted on the lens holding member, and a magnet facing the coil,
Each of the leaf springs connects a fixed side support portion supported by the support base, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the lens driving device that has an elastic arm portion and the coil and the movable side support portion are electrically connected,
The fixed support portion and a conductive plate having connection terminals are overlapped and fixed to the support base, and an edge portion of the fixed support portion is welded to the conductive plate, and the conductive plate The coil can be energized through a pair of leaf springs.

  In the lens driving device according to the aspect of the invention, it is preferable that the fixed side support portion is installed on a spring fixing surface formed on the support base, and the conductive plate is overlaid on the fixed side support portion.

  In the lens driving device of the present invention, a first protrusion is formed on the fixed-side support part, a second protrusion is formed on the conductive plate, and the first protrusion and the second protrusion are overlapped, The edge part of a 1st protrusion part can be comprised as what is welded to the said 2nd protrusion part.

  In the lens driving device of the present invention, the edge of the first protrusion and the edge of the second protrusion are aligned vertically.

  In the lens driving device according to the aspect of the invention, it is preferable that the connection terminal and the second protrusion are provided adjacent to each other in the conductive plate.

  A camera module according to the present invention includes the lens driving device according to any one of the above, a lens body held by the lens holding member of the lens driving device, and an imaging element facing the lens body. It is what.

Next, the present invention provides a support base, a lens holding member on which a lens body can be mounted, and the lens holding member provided between the support base and the lens holding member, the optical axis of the lens body. A pair of leaf springs that are movably supported in a direction, a coil mounted on the lens holding member, and a magnet facing the coil,
Each of the leaf springs connects a fixed side support portion supported by the support base, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the manufacturing method of the lens drive device which has an elastic arm part and the coil and the movable side support part are conducted,
Using a leaf spring blank in which the first connecting branch portion is continuous from the fixed side support portion, and a conductive plate blank in which the second connecting branch portion is continuous from the conductive plate having the connection terminal,
(A) a step of overlapping the fixed side support portion and the conductive plate so that the first connection branch portion and the second connection branch portion overlap each other;
(B) fusing the first connecting branch and welding the cut edge of the first connecting branch to the second connecting branch;
It is characterized by having.

The method for manufacturing a lens driving device of the present invention includes a step of fixing the fixed side support portion and the conductive plate to the support base between the step (a) and the step (b). And
In the step (b), it is preferable that the first connecting branch portion and the second connecting branch portion are fused at the same time.

  In the method for manufacturing a lens driving device of the present invention, the conductive plate is formed of a metal material having a plate thickness larger than that of the plate spring, and in the step (b), a laser is applied to the first connection branch side. Is preferably irradiated.

  In the manufacturing method of the lens driving device of the present invention, in the step (a), the fixed side support portion is installed on a spring fixing surface formed on the support base, and the conductive material is placed on the fixed side support portion. It is preferable to stack the plates.

In this case, the conductive plate is formed by bending the connection terminal,
When the fixed side support portion and the conductive plate are arranged on the spring fixing surface of the support base, the connection terminal is inserted into a through hole formed in the support base, and the connection terminal The tip portion can be exposed to the outside from the support base.
Moreover, it is preferable to fill the inside of the through hole with an adhesive.

  In the method for manufacturing a lens driving device according to the present invention, it is preferable that the connection terminal and the second protrusion are formed adjacent to each other on the conductive plate.

  In the method for manufacturing a lens driving device according to the present invention, a positioning protrusion is provided on the spring fixing surface of the support base, and a mounting hole formed in the fixing side support portion and a hole portion formed in the conductive plate. Further, it is preferable to insert the positioning protrusion.

  For example, in the method for manufacturing a lens driving device according to the present invention, a caulking deformation portion is formed on the positioning protrusion, and the fixing-side support portion and the conductive plate are caulked and fixed on the spring fixing surface.

  In the manufacturing method of the lens driving device of the present invention, it is preferable that the movable side support portion of the leaf spring is fixed to the lens holding member before the step (a).

  In the present invention, since the fixed side support portion of the leaf spring is welded to the conductive plate having the connection terminals, the fixed side support portion and the conductive plate can be conducted in a short time, and the reliability of conduction is high. can do.

  Moreover, the 1st connection branch part of a leaf | plate spring blank and the 2nd connection branch part of an electroconductive board blank can be piled up and fused together, and the process of cut | disconnecting a leaf | plate spring and an electroconductive board separately from a blank is eliminated. It is also possible.

The perspective view which shows the external appearance of the lens drive device of embodiment of this invention, FIG. 2 is an exploded perspective view showing components of the lens driving device shown in FIG. FIG. 1 is an exploded perspective view showing the lens driving device shown in FIG. 1 in a state where an upper leaf spring and a support member are removed; An exploded perspective view showing a fixed side support portion of the lower leaf spring and the conductive plate attached to the support base; FIG. 5 is an enlarged exploded perspective view showing a part of FIG. A bottom view of the fixing structure of the lens holding member and the lower leaf spring as viewed from the Z2 side, 1 is a perspective view showing a method for manufacturing a lens driving device according to the present invention, in which a movable side support portion of a lower leaf spring is fixed to a lens holding member, and a fixed side support portion of the lower leaf spring and a conductive plate are overlapped. Figure, 1 is a perspective view showing a method of manufacturing a lens driving device according to the present invention, in which a movable side support portion of a lower leaf spring is fixed to a lens holding member, and a stationary side support portion and a conductive plate of the lower leaf spring are overlapped. Figure, The manufacturing method of the lens drive device of the present invention, which is an exploded perspective view showing a process of attaching a lens holding member on which a lower leaf spring and a conductive plate are superimposed on a support base, 1 is a perspective view showing a manufacturing method of a lens driving device according to the present invention, in which a lens holding member with a lower leaf spring and a conductive plate superimposed on each other is attached to a support base; The manufacturing method of the lens drive device of this invention is shown, and after the fixed side support part and conductive plate of a lower leaf | plate spring are attached to a support base, the connection branch part of a leaf | plate spring blank and a conductive plate blank is cut | disconnected. A perspective view showing the state (A) (B) is an enlarged side view for explaining the welding process between the fixed side support portion of the lower leaf spring and the conductive wire plate;

  1 and 2 show the overall structure of a lens driving device 1 according to an embodiment of the present invention. FIG. 3 shows a support base, a lower leaf spring, a lens holding member, a coil, a magnet, and a case. It is shown. 4 and 5 show a conductive plate having a support base, a lower leaf spring, and connection terminals. FIG. 5 is an exploded perspective view showing a part of FIG. 4 in an enlarged manner.

  The lens driving device 1 has a lens holding member 10. The lens holding member 10 is formed by injection molding with a synthetic resin material. As shown in FIG. 3, the lens holding member 10 has a cylindrical portion 13. The cylindrical portion 13 is a relatively thin cylindrical body and has a center hole 13a continuous in the Z1-Z2 direction. A lens body (lens barrel or lens barrel) is attached to the center hole 13a of the cylindrical portion 13. The lens body includes a lens set obtained by combining one lens or a plurality of lenses, and a lens holder that holds the lens or the lens set. For example, an internal thread portion is formed in the center hole 13a, an external thread portion is formed on the outer peripheral surface of the lens holder, and the external thread portion is screwed to the internal thread portion, so that the lens body is mounted inside the cylindrical portion 13. Mounted. Alternatively, the lens body is inserted into the center hole 13a, and the lens body and the inner surface of the cylindrical portion 13 are fixed with an adhesive.

  A Z1-Z2 direction shown in each figure is a vertical direction, which is a direction (optical axis direction) parallel to the optical axis O of the lens body. The lens driving device 1 is mounted on a portable electronic device such as a mobile phone. An imaging element such as a CCD is disposed on the Z2 side of the lens driving device 1. The lens driving device 1, the lens body, and the image sensor are combined to form a camera module. In the camera module, when the lens holding member 10 and the lens body mounted on the lens holding member 10 move in the Z1-Z2 direction, automatic focusing of an image formed on the image sensor is performed.

  As shown in FIGS. 1, 2, and 3, the lens driving device 1 is provided with a support base 40 and a case 3. The support base 40 and the case 3 are combined to form a housing having a storage space inside. The lens holding member 10 and the lower leaf springs 20A and 20B are accommodated in this accommodation space.

  As shown in FIGS. 3 and 4, a pair of lower leaf springs 20A and 20B separated from each other are provided between the support base 40 and the lens holding member 10 positioned thereon. The lower leaf spring located on the Y1 side is denoted by reference numeral 20A, and the lower leaf spring located on the Y2 side is denoted by reference numeral 20B. Each of the lower leaf springs 20A and 20B is a leaf spring in which a fixed side support portion 21, a movable side support portion 22, and an elastic arm portion 23 that connects the fixed side support portion 21 and the movable side support portion 22 are conductive. It is integrally formed of a metal material. For example, the lower leaf springs 20A and 20B are formed of a springy stainless steel plate or phosphor bronze plate.

  As shown in FIG. 4, the fixed-side support portion 21 of the lower leaf spring 20A located on the Y1 side is formed separately into an attachment portion 21a located on the X2 side and an attachment portion 21b located on the X1 side. The fixed side support portion 21 of the lower leaf spring 20B located on the Y2 side is also formed by being divided into an attachment portion 21a located on the X2 side and an attachment portion 21b located on the X1 side. The lower leaf springs 20A and 20B each have a mounting hole 24a formed in the mounting portion 21a located on the X2 side, and a mounting hole 24b formed in the mounting portion 21b located on the X1 side. The mounting holes 24a and 24b are preferably holes with the entire periphery of the edge closed, but may be notched holes with a part opened.

  As shown in FIGS. 3, 4, and 5, the conductive plate 50 </ b> A is superimposed on the upper side (Z <b> 1 side) of the X <b> 2 side mounting portion 21 a of the lower leaf spring 20 </ b> A located on the Y <b> 1 side, and the lower part located on the Y <b> 2 side. The conductive plate 50B is overlaid on the upper side (Z1 side) of the attachment portion 21a on the X2 side of the leaf spring 20B. The conductive plates 50A and 50B are formed of a conductive metal plate, and are formed of, for example, a rolled steel plate whose surface is gold-plated, brass or another copper alloy plate. The conductive plates 50 </ b> A and 50 </ b> B include a support plate portion 51 that is parallel to the XY plane, and a connection terminal 52 that is bent downward from an edge portion of the support plate portion 51. A hole 53 is formed in the support plate 51. The hole 53 is preferably a hole whose entire circumference is closed, but may be a notch-shaped hole partially opened.

  The attachment portion 21a of the lower leaf spring 20A on the Y1 side and the support plate portion 51 of the conductive plate 50A are positioned relative to each other by making the attachment hole 24a and the hole portion 53 coincide with each other. The attachment portion 21a of the lower plate spring 20B on the Y2 side and the support plate portion 51 of the conductive plate 50B are also relatively positioned by making the attachment hole 24a and the hole portion 53 coincide with each other.

  As shown in FIGS. 4 and 5, a first projecting portion 25 projecting in the X2 direction is formed on the attachment portion 21a of the lower leaf spring 20A, and a first projecting portion projecting in the X2 direction is formed on the support plate portion 51 of the conductive plate 50A. Two projecting portions 54 are formed. In a state where the mounting portion 21a of the lower leaf spring 20A and the support plate portion 51 of the conductive plate 50A are positioned and overlapped, the edge portion 25a of the first protruding portion 25 and the edge portion of the second protruding portion 54 are caused by laser. 54a is fused together. As a result, the edge 25a of the first protrusion 25 and the edge 54a of the second protrusion 54 coincide in the vertical direction (Z1-Z2 direction), and the edge 25a of the first protrusion 25 is the second. It is welded to the edge part 54a of the protrusion part 54, and the attachment part 21a and the support plate part 51 are conducted.

  The conductive plate 50A is formed of a metal plate that is thicker than the lower plate spring 20A. Therefore, in a state where the attachment portion 21a and the support plate portion 51 are overlapped, the edge 25a of the attachment portion 21a is supported on the support plate portion by irradiating the laser from the lower leaf spring 20A toward the Z1 direction from the Z2 side. 51 can be efficiently welded. This fusing and welding process will be described in detail later with reference to FIG.

  A first projecting portion 25 is also formed on the attachment portion 21a of the lower leaf spring 20B on the Y2 side, and a second projecting portion 54 is also formed on the support plate portion 51 of the conductive plate 50B. Also on the Y2 side, the edge 25a of the first protrusion 25 and the edge 54a of the second protrusion 54 are simultaneously melted and welded by the laser.

  The attachment portions 21a of the lower leaf springs 20A and 20B and the support plate portions 51 of the conductive plates 50A and 50B are only welded portions between the edge portion 25a of the first protrusion portion 25 and the edge portion 54a of the second protrusion portion 54. In addition, it is possible to add a welding point by further irradiating a laser beam on the central portion or the like.

  As shown in FIGS. 4 and 5, in the conductive plates 50 </ b> A and 50 </ b> B, the second protrusion 54 is directed to the X2 side, the connection terminal 52 is positioned on the X2 side, and the second protrusion 54 and the connection terminal 52 are located. Are adjacent to each other in the Y1-Y2 direction. Therefore, when processing the conductive plates 50A and 50B from a metal plate, the yield of the metal plate is improved.

  As shown in FIG. 4, the support base 40 has a square shape (rectangular shape) when viewed from the optical axis direction, and is formed of a synthetic resin material that is a nonmagnetic material. On the four corners of the support base 40, spring fixing surfaces 41A and 41B are formed. Two spring fixing surfaces located on the X2 side are denoted by reference numeral 41A, and two spring fixing surfaces located on the X1 side are denoted by reference numeral 41B. The spring fixing surfaces 41A and 41B are formed at a position one step higher in the Z1 direction on the upper surface 40a of the support base 40 facing the Z1 direction. The surfaces of all the spring fixing surfaces 41A and 41B located at four locations are located on the same plane parallel to the XY plane. Since the support base 40 is injection-molded with a synthetic resin material, the four spring fixing surfaces 41A and 41B can be positioned substantially on the same plane by increasing the accuracy of the mold.

  Positioning protrusions 42a are integrally formed on the two spring fixing surfaces 41A located on the X2 side, and positioning protrusions 42b are integrally formed on the two spring fixing surfaces 41B located on the X1 side. The positioning protrusions 42a and 42b protrude in the Z1 direction. As shown in FIGS. 4 and 5, the positioning protrusions 42a and the positioning protrusions 42b are cylindrical bodies each having a certain radius.

  As shown in FIGS. 4 and 5, the support base 40 is formed with a rectangular through hole 43 at a position adjacent to the spring fixing surface 41A formed on the X2 side. The through hole 43 is formed between the side 40c facing the X2 side of the support base 40 and each spring fixing surface 41A. The through hole 43 is formed through the support base 40 in the vertical direction (Z1-Z2 direction).

  In the state where the attachment portion 21a on the X2 side of the lower leaf springs 20A and 20B and the support plate portion 51 of each conductive plate 50A and 50B are overlapped, it is formed in the attachment hole 24a and the support plate portion 51 formed in the attachment portion 21a. The positioning projection 42a of the support base 40 is inserted through the hole 53, and the mounting portion 21a and the support plate portion 51 are placed on the spring fixing surface 41A. Further, the positioning protrusion 42b is inserted into the mounting hole 24b formed in the mounting portion 21b on the X1 side of the lower leaf springs 20A and 20B, and the mounting portion 21b is installed on the spring fixing surface 41B.

  As shown in FIG. 3, the tip portions of the positioning projections 42a and 42b are heated and pressed to form a crimp deformation portion 44a at the tip portion of the positioning projection 42a, and the crimp deformation portion at the tip portion of the positioning projection 42b. 44b is formed. As a result, the mounting portion 21a of the lower leaf springs 20A and 20B and the support plate portion 51 of the conductive plates 50A and 50B are fixed by caulking on the spring fixing surface 41A on the X2 side of the support base 40. The On the spring fixing surface 41B on the X1 side of the support base 40, the attachment portions 21b of the lower leaf springs 20A and 20B are caulked and fixed.

  As shown in FIGS. 3, 4, and 5, on the support base 40, the attachment portions 21 a and 21 b that become the fixed side support portion 21 of the Y1 side lower leaf spring 20 </ b> A and the Y2 side lower leaf spring 20 </ b> B Mounting portions 21a and 21b to be the fixed side support portions 21 are installed on the spring fixing surfaces 41A and 41B of the support base 40 in direct contact with each other, and conductive plates 50A and 50B having support terminals 52 (supports). The plate portion 51) is overlaid on the upper side (Z1 side) of the attachment portion 21a of the lower leaf springs 20A and 20B.

  Since the support base 40 is injection-molded with a synthetic resin material, the four spring fixing surfaces 41A and 41B can be formed on substantially the same plane by increasing the accuracy of the mold. Since the attachment portions 21a and 21b of the lower leaf springs 20A and 20B are directly received only by the surfaces of the spring fixing surfaces 41A and 41B, the flatness of the fixed side support portion 21 of the lower leaf springs 20A and 20B is kept high. Then, it can be attached to the support base 40. Moreover, the relative flatness of the fixed side support portions 21 of the lower leaf spring 20A and the lower leaf spring 20B that are separated from each other can be maintained high.

  As shown in FIG. 4, the four attachment portions 21a and 21b constituting the fixed-side support portion 21 of the lower leaf springs 20A and 20B are not connected to each other and have independent structures. Therefore, on the support base 40, it is only necessary to provide the spring fixing surfaces 41A and 41B only at the corners of the quadrangle, and it is not necessary to arrange the spring fixing surfaces on the X1-X2 side and the Y1-Y2 side. Therefore, the support base 40 can be reduced in size, and the attachment portions 21a and 21b can be supported with sufficient strength. Moreover, since the attachment parts 21a and 21b separated into four are installed on the spring fixing surfaces 41A and 41B formed on substantially the same plane, the two lower leaf springs 20A and 20B maintain a high flatness. It becomes possible to fix with.

  Since the conductive plates 50A and 50B are stacked on the fixed-side support portion 21 of the lower leaf springs 20A and 20B, compared to the structure in which the connection terminals are embedded in the support base by insert molding, The thickness dimension of the support base 40 in the Z1-Z2 direction can be reduced, and as a result, the lens driving device 1 can be easily thinned.

  When the conductive plates 50A and 50B are caulked and fixed on the support base 40, the connection terminals 52 integral with the conductive plates 50A and 50B are inserted into the through holes 43 formed in the support base 40, The Z2 side tip of the connection terminal 52 is exposed further below the lower surface 40 b of the support base 40. At this time, by filling the inside of the through hole 43 with an adhesive, the conductive plates 50A and 50B can be firmly fixed to the support base 40, and the through hole 43 is closed with an adhesive and supported. It becomes easy to prevent liquid or the like from entering the inside of the case 3 from the lower side of the base 40 through the through hole 43.

  In the present invention, an adhesive may be attached around the positioning protrusions 42a and 42b without forming the caulking deformation portions 44a and 44b on the positioning protrusions 42a and 42b. By providing an adhesive layer between the positioning projection 42a on the X2 side and the attachment hole 24a and the hole 53, the attachment part 21a of the lower leaf springs 20A and 20B and the support plate part 51 of the conductive plates 50A and 50B are supported. It can be bonded and fixed to the base 40. Further, the attachment portion 21b of the lower leaf springs 20A and 20B and the support base 40 can be bonded and fixed with an adhesive adhered to the positioning projection 42b on the X1 side. Moreover, you may use together this adhesion fixing and the caulking fixation by caulking deformation part 44a, 44b.

  As shown in FIG. 4, a pair of mounting holes 22a are formed in the movable side support portions 22 of the lower leaf springs 20A and 20B on the X1 side and the X2 side, respectively. As shown in the bottom view of FIG. 6, on the lower surface of the lens holding member 10 facing in the Z2 direction, spring fixing surfaces 10b are provided on the X1 side and the X2 side. In each spring fixing surface 10b, a pair of protrusions 10c protruding in the Z2 direction are integrally formed on the Y1 side, and a pair of protrusions 10d protruding in the Z2 direction are integrally formed on the Y2 side. The mounting hole 22a formed in the movable side support portion 22 of the lower leaf spring 20A on the Y1 side is fitted into the protrusion 10c, and the protrusion 10c is heat caulked so that the movable side support portion 22 of the lower leaf spring 20A is The lens holding member 10 is fixed to the spring fixing surface 10b on the lower surface. Similarly, the movable support 22 of the lower leaf spring 20B is fixed to the spring fixing surface 10b by fitting the mounting hole 22a of the lower leaf spring 20B on the Y2 side to the protrusion 10d and heat caulking the protrusion 10d. Is done.

  Since the lower leaf springs 20A and 20B are fixed to spring fixing surfaces 41A and 41B formed so as to be substantially flush with the support base 40, and the flatness is maintained high, the lower leaf springs 20A and 20B are movable. The lens holding member 10 supported by the side support portion 22 can suppress the inclination of the optical axis O (the optical axis of the lens body) coinciding with the central axis of the cylindrical portion 13, and the spring fixing surface 41 </ b> A of the optical axis O. The perpendicularity to the plane (XY plane) along 41B can be set with high accuracy.

  As shown in FIG. 3, a flange portion 11 is formed on the Z2 side and a plurality of regulating protrusions 12 are formed on the Z1 side on the outer side (outer peripheral portion) of the cylindrical portion 13 of the lens holding member 10. . The flange portion 11 may have a bowl shape extending substantially continuously in the circumferential direction around the optical axis O, or may be formed intermittently in the circumferential direction. The restricting protrusions 12 are formed at intervals in the circumferential direction. The flange portion 11 and the plurality of regulating protrusions 12 face each other in the optical axis direction (Z1-Z2 direction).

  As shown in the bottom view of FIG. 6, projections 19a and 19b are integrally formed at two locations on the bottom surface of the lens holding member 10 facing the Z2 direction. The protrusions 19a and 19b protrude in the Z2 direction. The protrusion 19a located on the Y1 side is a winding protrusion for fixing the winding start end 61a of the conducting wire forming the coil 60, and the protrusion 19b located on the Y2 side is a winding protrusion for fixing the winding end 61b of the conducting wire. The conducting wire for forming the coil 60 is a coated conducting wire, and has a copper wire that is a conductive metal wire and an insulating coating layer that covers the copper wire. The covering layer has a two-layer structure of an insulating layer such as a polyurethane resin covering the copper wire and a fusion layer such as a polyamide resin on the surface thereof.

  The coating layer is removed at the winding start end 61a of the conducting wire, and the winding start end 61a is wound around the protrusion 19a on the Y1 side shown in FIG. The conducting wire extending from the protrusion 19 a is wound between the flange portion 11 and the restriction protrusion 12 on the outer side portion of the cylindrical portion 13 of the lens holding member 10. In the winding process, the conductive wire is heated by applying hot air or the like, and the insulating layers are fusion-bonded together by melting the fusion layer to form the coil 60. The winding end 61b of the conducting wire that has finished winding the coil 60 is drawn out to the lower surface of the lens holding member 10, the coating layer is removed, and the winding end 61b is wound around the Y2 projection 19b shown in FIG.

  As shown in FIG. 6, when the movable side support portion 22 of the lower leaf springs 20A and 20B is fixed to the spring fixing surfaces 10b and 10b on the lower surface of the lens holding member 10, it is wound around the protrusion 19a on the Y1 side. The winding start end 61a of the conducting wire is adjacent to the movable support 22 of the lower leaf spring 20A on the Y1 side, and the winding start 61a and the movable support 22 are soldered. The winding end 61b of the conducting wire wound around the Y2 side protrusion 19b and the movable side support portion 22 of the Y2 side lower leaf spring 20B are also soldered in a state adjacent to each other. As a result, one lower leaf spring 20A is conducted to the winding start end 61a of the conductive wire, and the other lower leaf spring 20B is conducted to the winding end 61b.

  As shown in FIG. 3, the conductive plate 50A is overlapped and joined to the attachment portion 21a of the lower leaf spring 20A on the Y1 side, and the conductive plate 50B is overlapped and joined to the attachment portion 21a of the lower leaf spring 20B on the Y2 side. Therefore, the connection terminal 52 of the conductive plate 50A is electrically connected to the winding start end 61a of the coil 60 via the lower plate spring 20A on the Y1 side, and the connection terminal 52 of the conductive plate 50B is connected to the lower plate spring 20B on the Y2 side. Is conducted to the winding end 61b of the coil 60.

  The case 3 shown in FIGS. 1, 2 and 3 is formed of a magnetic steel plate (steel plate made of ordinary steel) or the like and functions as a magnetic yoke. Case 3 has a ceiling portion 3a. The support base 40 has a light transmission hole 45 at the center, but the opening 3 b also opens at the ceiling 3 a of the case 3. The light transmission hole 45 of the support base 40 and the opening 3b of the case 3 face each other in the Z1-Z2 direction, and also face the center hole 13a of the lens holding member 10 from above and below.

  The case 3 has a quadrangular (rectangular) planar shape, and is provided with four planar side plate portions 3d as outer wall portions and a square side plate portion 3e that connects the respective planar side plate portions 3d. The planar shape of the opening 3b formed in the ceiling portion 3a is a quadrangular shape, and the opposing yoke portion 3c bent in the Z2 direction is integrally formed from the four corners of the inner edge of the opening 3b. ing. The opposing yoke portion 3c faces the inner surface of each square side plate portion 3e from the inside of the case.

  The ceiling part 3a of the case 3 has a rectangular shape when viewed from above, which is the optical axis direction, and the through parts 4 are formed at the four corners thereof. The through portion 4 faces the magnet M fixed inside the case 3 in the Z1 direction. As shown in FIG. 2, the upper leaf spring 30 is installed above the ceiling 3 a of the case 3 (in the Z1 direction). The upper leaf spring 30 has a substantially rectangular frame-shaped fixed side support portion 31, a movable side support portion 32 inside thereof, and an elastic arm portion that connects the fixed side support portion 31 and the movable side support portion 32 at four locations. 33 is integrally formed of a leaf spring metal material. Through portions 34 are formed at four corners of the fixed side support portion 31.

  As shown in FIGS. 1 and 2, a support member (spring fixing member) 6 is provided above the ceiling 3 a of the case 3 and further above the upper leaf spring 30 (Z1 direction). The support member 6 is formed in a rectangular shape by a nonmagnetic material such as a synthetic resin material. On the lower surface of the support member 6 facing in the Z2 direction, the protrusions 7 are integrally formed from the four corners in the Z2 direction. A light transmission hole 6 b is opened at the center of the support member 6. The light transmission hole 6 b faces the opening 3 b formed in the ceiling 3 a of the case 3.

  As shown in FIG. 1 and FIG. 2, the fixed side support portion 31 of the upper leaf spring 30 is installed on the outer surface facing the Z1 side of the ceiling portion 3a of the case 3, and the support member 6 is overlaid thereon, The protrusions 7 provided at the four locations of the support member 6 are inserted into the through portions 34 formed at the four locations of the fixed-side support portion 31 of the upper leaf spring 30, and 4 of the ceiling portion 3 a of the case 3. It is inserted through the penetrating part 4 formed at the place. And the tip part which faces the Z2 side of the protrusion 7 on the inner side of the ceiling part 3a of the case 3 is thermally deformed, and the support member 6 and the ceiling part 3a of the case 3 However, heat caulking is fixed.

  As shown in FIGS. 2 and 3, the lens driving device 1 is provided with four magnets M. The four magnets M are formed independently. As shown in FIG. 3, each of the magnets M is an outer surface Ma serving as an outer magnetized surface directed outward in the radial direction around the optical axis O, and an inner magnetized surface facing the optical axis O. It has a magnetized surface Mg. Each magnet M is magnetized such that the magnetized surface Mg and the outer surface Ma have different polarities. Further, the magnetized surfaces Mg of all the magnets M are magnetized so as to have the same polarity. Each magnet M has a flat upper surface Mb facing in the Z1 direction.

  The four magnets M are disposed inside the case 3 and inside the square side plate portion 3e. In a state in which a fluid adhesive is applied to the inner surfaces of the corner side plate portion 3e and the flat side plate portion 3d of the case 3, each magnet M is in a posture in which the magnetized surface Mg faces the optical axis O. Are magnetically attracted to the inner surface of the planar side plate portion 3d facing each other at an angle of 90 degrees. With the adhesive interposed between the inner surface of the case 3 and each magnet M, each magnet M has an upper surface Mb facing in the Z1 direction of the caulking deformed portion (thermally deformed portion) of the protrusion 7. The magnet M is positioned in the Z1 direction (optical axis O direction) inside the case 3 by being abutted against the tip surface.

  When the lens driving device 1 is assembled, a part of the fluid adhesive provided between the inner surfaces of the corner side plate portion 3e and the flat side plate portion 3d of the case 3 and the magnet M is formed on the support member 6. Flows into the gap between the protruding portion 7 and the penetrating portion 4 formed in the ceiling portion 3 a of the case 3. Then, the adhesive penetrates between the outer surface of the ceiling portion 3a facing the Z1 direction and the corner portion of the fixed side support portion 31 of the upper leaf spring 30 by capillary action. When the adhesive is thermally cured, each magnet M is bonded and fixed inside the case 3, and the outer surface of the ceiling portion 3 a of the case 3 and the fixed side support portion 31 of the upper leaf spring 30 are bonded and fixed. The Further, the support member 6 is also bonded and fixed to the case 3.

  As shown in FIGS. 2 and 3, a spring fixing surface 10 a is provided on the upper surface of the cylindrical portion 13 of the lens holding member 10 facing the Z1 direction. After the magnet M is fixed inside the case 3 and the upper leaf spring 30 and the support member 6 are fixed outside the ceiling portion 3a of the case 3, the lens holding member 10 and the lower leaf spring 20A around which the coil 60 is wound. An assembly 70 (see FIG. 11) in which the 20B, the conductive plates 50A and 50B, and the support base 40 are assembled is inserted into the case 3 from below. The spring fixing surface 10a of the lens holding member 10 passes through the opening 3b formed in the ceiling portion 3a of the case 3 and protrudes upward (Z1 direction) from the outer surface of the ceiling portion 3a. The spring fixing surface 10a is abutted on the lower side of the movable side support portion 32 of the upper leaf spring 30, and the spring fixing surface 10a and the movable side support portion 32 are fixed with an adhesive. The support base 40 and the case 3 are also fixed to each other with an adhesive.

  As shown in FIGS. 2 and 3, there is a gap between the outer surface of the cylindrical portion 13 of the lens holding member 10 and the coil 60 at a portion where the regulating protrusion 12 on the outer side of the lens holding member 10 does not exist. (I) is formed. The gaps (i) are formed at four locations on the outer side of the lens holding member 10. When the lens holding member 10 is housed in the case 3 and the upper end portion of the lens holding member 10 and the movable side support portion 32 of the upper leaf spring 30 are fixed, the opening 3b of the case 3 (ceiling portion 3a). The opposing yoke portion 3c bent downward from four locations around the center enters the inside of the gap (i). Therefore, the magnetized surface Mg of the magnet M faces the outside of the coil 60, and the facing yoke portion 3 c faces the inside of the coil 60.

  As shown in FIG. 3, the elastic arm portions 23 provided in the lower leaf springs 20A and 20B are formed in a thin curved shape, that is, a meandering shape, and are provided in the upper leaf spring 30 as shown in FIG. The elastic arm portion 33 is also formed into a thin curved shape, that is, a meandering shape. The lower end of the lens holding member 10 and the support base 40 are connected via lower leaf springs 20A and 20B, and the upper end of the cylindrical portion 13 of the lens holding member 10 and the ceiling portion 3a of the case 3 are the upper plate. It is connected via a spring 30. Due to the elastic supporting force of both the elastic arm portions 23 of the lower leaf springs 20A and 20B and the elastic arm portion 33 of the upper leaf spring 30, the lens holding member 10 is inside the case 3 in the Z1-Z2 direction that is the optical axis direction. It is supported to move freely.

  The case 3, the support member 6, the magnet M, and the support base 40 constitute a stationary member that does not move with respect to the movable lens holding member 10. The upper leaf spring 30 may be provided between the fixed side member including the case 3 (housing) and the lens holding member 10, and does not need to be disposed outside the case 3. For example, the fixed side support portion 31 of the upper leaf spring 30 may be fixed between the lower surface of the ceiling portion 3a of the case 3 and the upper surface Mb of the magnet M.

Next, operations of the lens driving device 1 having the above structure and a camera module using the lens driving device 1 will be described.
When the drive current is not applied to the coil 60, the lens holding member 10 supported by the lower leaf springs 20A and 20B and the upper leaf spring 30 is stable at the position moved in the Z2 direction. That is, in this initial state, a part of the lower end side of the lens holding member 10 is in contact with a part of the upper surface of the support base 40. When a drive current is applied to the connection terminals 52, 52 protruding from the support base 40, the drive current flows through the pair of lower leaf springs 20A, 20B to the coil 60 between the winding start end 61a and the winding end 61b. The lens holding member 10 is driven in the optical axis direction (Z1 direction) by an electromagnetic force generated by a drive current flowing through the coil 60 and a magnetic field generated from the magnet M. By the operation of the lens holding member 10, the image formed on the imaging element is focused by the lens body held by the lens holding member 10.

Next, a method for manufacturing the lens driving device 1 will be described with reference to FIGS.
7 and 8, the lens holding member 10 is shown in a posture in which the lower surface on the Z2 side faces upward in the figure. Although the coil 60 is wound around the outer side of the lens holding member 10, in FIGS. 7 and 8, the winding start end 61a of the conducting wire wound around the protrusion 19a and the winding end 61b wound around the protrusion 19b (both see FIG. 6). ) Is omitted. Further, in FIG. 9, the crimping deformation portions 44a and 44b are formed on the positioning protrusions 42a and 42b.

  In the process of FIG. 7, the leaf spring blank 120 and the conductive plate blank 150 are used. The leaf spring blank 120 is punched from a spring metal plate. However, the leaf spring blank 120 may be obtained by etching a metal plate. The leaf spring blank 120 has the outer shapes of the lower leaf spring 20A and the lower leaf spring 20B punched out. The first connecting branch 121a is continuous from the X2 side mounting portion 21a of the lower leaf spring 20A, and the first connecting branch 121a is also continuous from the X2 side mounting portion 21a of the lower leaf spring 20B. The support plate portion 122a is continuous with the first connecting branch portions 121a and 121a. The first connecting branch 121b is continuous from the X1 side mounting portion 21b of the lower leaf spring 20A, and the first connecting branch 121b is also continuous from the X1 side mounting portion 21b of the lower leaf spring 20B. The support plate portion 122b is continuous with the first connecting branch portions 121b and 121b. Therefore, the lower leaf spring 20A and the lower leaf spring 20B are connected via the first connection branch portions 121a and 121b and the support plate portions 122a and 122b.

  The support plate portion 122a and the support plate portion 122b are band-shaped plate portions that are continuous in the Y1-Y2 direction. The support plate portion 122a and the support plate portion 122b extend long in the Y1-Y2 direction, and a plurality of lower leaf springs 20A and 20B are spaced apart in the Y1-Y2 direction from the common support plate portion 122a and the support plate portion 122b. Are connected. A feed hole 123a is formed in the support plate portion 122a, a feed hole 123b is formed in the support plate portion 122b, and the support plate portions 122a and 122b are sent in the Y direction using the feed holes 123a and 123b. Each lower leaf | plate spring 20A, 20B is sent in order according to a some assembly process.

  The conductive plate blank 150 is formed of a conductive metal plate, and the outer shapes of the two conductive plates 50A and 50B are punched out. A second connecting branch 151 is continuous from each of the conductive plates 50A and 50B, and a support plate 152 is continuous with each second connecting branch 151. The support plate portion 152 is a belt-like plate portion that extends continuously in the Y1-Y2 direction, and a plurality of conductive plates 50A and 50B are connected to the common support plate portion 152 at intervals in the Y1-Y2 direction. . A feed hole 153 is formed in the support plate portion 152. In the conductive plate blank 150, the conductive plates 50A and 50B are provided with connection terminals 52 that are bent at the edge of the support plate portion 51 and project in the Z2 direction.

  As shown in FIGS. 7 and 8, the mounting holes 22a formed on the X1 and X2 sides of the movable support 22 of the lower leaf spring 20A on the Y1 side are fitted into the protrusions 10c on the lower surface of the lens holding member 10. Then, the protrusion 10c is caulked with heat. At the same time, the mounting holes 22a formed on the X1 and X2 sides of the movable support 22 of the lower leaf spring 20B on the Y2 side are fitted into the protrusions 10d on the lower surface of the lens holding member 10 to heat the protrusions 10d. . Thereby, the movable side support part fixing process of the leaf | plate spring which fixes the movable side support part 22 of lower leaf | plate spring 20A, 20B to the spring fixing surface 10b of the lens holding member 10 is performed.

  In the step before or after the movable side support portion fixing step, as shown in FIG. 8, the conductive plate is attached to the attachment portions 21a and 21a on the X2 side which is the fixed side support portion 21 of the lower leaf springs 20A and 20B. A stacking process is performed in which the support plates 51 of the conductive plates 50A and 50B of the blank 150 are stacked. After both the movable side support portion fixing step and the laminating step, as shown in FIG. 9, the leaf spring blank 120 and the conductive plate blank 150 fixed to the lower surface of the lens holding member 10 face downward in the figure, and the leaf spring blank 120 And the fixing process (fixing process of a fixed side support part and a conductive plate) which fixes the conductive plate blank 150 to the support base 40 is performed.

  In the laminating step and the fixing side support portion and the conductive plate fixing step, the mounting portion 21a on the X2 side of the lower leaf springs 20A and 20B is fixed to the support base 40 by the spring as described with reference to FIGS. It is installed on the surface 41A, and the support plate portions 51 of the conductive plates 50A and 50B are stacked on the attachment portion 21a (lamination process). In the stacking process, the positioning protrusion 42a is inserted into the mounting hole 24a and the hole 53, and the crimped deformation portion 44a is formed at the tip of the positioning protrusion 42a. In other words, the fixing step of the fixing side support portion and the conductive plate is performed by forming the caulking deformation portion 44a.

  At this time, the attachment portion 21a of the fixed side support portion 21 is disposed between the upper surface (spring fixing surface 41A) of the support base 40 and the support plate portions 51 of the conductive plates 50A and 50B. Also, the X1 side mounting portion 21b of the lower leaf springs 20A and 20B is also installed on the spring fixing surface 41B of the support base 40, the positioning projection 42b is inserted into the mounting hole 24b, and the tip of the positioning projection 42b is inserted. The caulking deformation portion 44b is formed.

  Further, the connection terminals 52 of the conductive plates 50 </ b> A and 50 </ b> B are inserted into the through holes 43 formed in the support base 40, and the tip portions of the connection terminals 52 are protruded from the lower surface of the support base 40. Then, the through hole 43 is filled with an adhesive from the Z1 side. Further, if necessary, an adhesive is also applied to the positioning protrusions 42a, and the attachment portion 21a and the support plate portion 51 are bonded and fixed to the support base 40. Further, the positioning protrusion 42b and the attachment portion 21b are also fixed with an adhesive. By using a thermosetting adhesive as the adhesive filling the through hole 43 and the adhesive applied to the positioning protrusions 42a and 42b, these adhesives can be cured simultaneously by heating.

  In the laminating step and the fixing side support portion and the conductive plate fixing step, the attachment portions 21a and 21b of the lower leaf springs 20A and 20B are firstly fixed with the lens holding member 10 and the movable side support portion 22 fixed. Are mounted on the spring fixing surfaces 41A and 41B, the positioning protrusions 42a and 42b are inserted into the mounting holes 24a and 24b, and then the conductive plates 50A and 50B are overlaid on the corresponding mounting portions 21a and 21a, respectively. The protrusion 42a can be inserted into the hole 53 of the conductive plates 50A and 50B to perform a heat caulking process or the like. Alternatively, as shown in FIG. 8, in the step before or after the movable side support portion fixing step, the X2 side mounting portions 21a and 21a, which are the fixed side support portions 21 of the lower leaf springs 20A and 20B, are electrically connected. 9 and 10, the plate spring blank 120 and the conductive plate blank 150 are temporarily fixed with an adhesive or the like while the support plate portions 51 of the conductive plates 50 </ b> A and 50 </ b> B of the plate blank 150 are stacked and positioned. As shown, the attachment portions 21a, 21b and the conductive plates 50A, 50B may be fixed to the support base 40. In addition, the 2nd connection of the 1st connection branch part 121a of the leaf | plate spring blank 120 and the electrically conductive plate blank 150 is carried out by the lamination | stacking process which overlaps the attaching part 21a of lower leaf | plate spring 20A, 20B, and the support plate part 51 of electrically conductive plate 50A, 50B. The branch portion 151 is overlapped in the thickness direction of the lower leaf springs 20A and 20B.

  As described above, the fixed side support portion 21 of the lower plate springs 20A and 20B and the support plate portion 51 of the conductive plates 50A and 50B are arranged and fixed on the spring fixing surfaces 41A and 41B of the support base 40. The process ends. Note that when the attachment portion 21a and the support plate portion 51 are bonded and fixed to the support base 40 by applying an adhesive to the positioning projection 42a, the caulking deformation portion 44a is not formed at the front portion of the positioning projection 42a. May be. Similarly, when the positioning projection 42b and the attachment portion 21b are fixed with an adhesive, the caulking deformation portion 44b may not be formed at the tip of the positioning projection 42b.

  After the above-described movable side support portion fixing step (shown in FIG. 8), a step of conducting the movable side support portion 22 of the lower leaf springs 20A and 20B and the coil 60 (conduction connection step) is performed. In this conductive connection step, as described above with reference to FIG. 6, the movable side support portion 22 and the winding start end 61a of the lower leaf spring 20A are soldered, and the movable side support portion 22 and the winding end of the lower leaf spring 20B are soldered. 61b is soldered. This conductive connection step may be performed anywhere after the movable side support portion fixing step and before the fixed side support portion and the conductive plate fixing step.

  In the embodiment, as shown in FIG. 6, the winding start end 61 a and winding end 61 b of the conductive wire constituting the coil 60 are wound around the protrusions 19 a and 19 b on the lower surface of the lens holding member 10. The portion and the lower leaf springs 20A and 20B are soldered to be conductive. However, the present invention has a structure in which the winding start end 61a and winding end 61b of the conductive wire extending from the coil 60 are directly connected to the lower leaf springs 20A and 20B by soldering or a conductive adhesive. Good.

  As shown in FIG. 10, the plate spring blank 120, the conductive plate blank 150, the lens holding member 10, and the coil 60 can be mounted on the support base 40 by the end of the fixing process of the fixed side support portion and the conductive plate. it can. Next, the cutting process (melting process) of a connection branch part is performed.

  In a state where the fixing process of the fixed side support portion and the conductive plate is completed, as shown in FIGS. 10 and 12A, the first connecting branch portion 121a extending in the X2 direction from the leaf spring blank 120, and the conductive plate blank A second connecting branch 151 extending in the X2 direction from 150 overlaps in the vertical direction (Z1-Z2 direction). In the cutting step, the overlapping portion of the first connecting branch 121a and the second connecting branch 151 extending in the X2 direction is simultaneously cut along the cutting line L1 shown in FIG. 10, and extends to the X1 side. The 1st connection branch part 121b of the leaf | plate spring blank 120 is cut | disconnected along the cutting line L2. The cutting process of the cutting line L1 and the cutting line L2 is performed by a laser cutter. Although not shown in the drawings in the present embodiment, the laser that irradiates the first connecting branches 121a and 121b from the Z2 side hits the support base 40 in correspondence with the cutting lines L1 and L2. The support base 40 is provided with a penetrating portion (a relief hole) for avoiding the above.

  Explaining the cutting process at the cutting line L1 of the overlapping portion of the first connecting branch 121a and the second connecting branch 151, the leaf spring blank 120 is formed rather than the metal plate forming the conductive plate blank 150. The metal plate is thinner, and the ratio is 1/3 or less. Therefore, as indicated by an arrow in FIG. 12 (A), the first connection with a small plate thickness at the overlapping portion between the first connection branch 121a of the leaf spring blank 120 and the second connection branch 151 of the conductive plate blank 150. The laser Ls is irradiated from the branch part 121a side, and the first connection branch part 121a and the second connection branch part 151 are fused together and simultaneously.

  As shown in FIGS. 4, 11, and 12, when the overlapping portion of the first connecting branch 121 a of the leaf spring blank 120 and the second connecting branch 151 of the conductive plate blank 150 is melted by a laser cutter, A part of the first connecting branch part 121a remains on the attachment part 21a, which is the fixed side support part 21 of the leaf springs 20A and 20B, and this part becomes the first protruding part 25. After being cut, the first protrusion 25 is defined as a part of the attachment portion 21a. At the same time, a part of the second connecting branch part 151 remains on the support plate part 51 of the conductive plates 50 </ b> A and 50 </ b> B, and this part becomes the second projecting part 54. After the cutting, the second projecting portion 54 is defined as a part of the support plate portion 51 of the conductive plates 50A and 50B.

  Since the first connecting branch 121a and the second connecting branch 151 are fused together, the edge 25a of the first protrusion 25 and the edge 54a of the second protrusion 54 coincide in the Z1-Z2 direction. The edge 25a of the first protrusion 25 and the edge 54a of the second protrusion 54 are welded to each other, and the conductive plates 50A and 50B and the attachment part 21a are electrically connected. In the process before or after the first connecting branch 121a and the second connecting branch 151 are fused with the laser cutter, the overlapping region of the mounting part 21a and the support plate 51 is scanned with the same laser cutter. , May be welded together.

  By completing the cutting step, the assembly 70 shown in FIGS. 11 and 12B is completed. As shown in FIG. 11, the assembly 70 in which the support base 40, the lower leaf springs 20 </ b> A and 20 </ b> B, the conductive plates 50 </ b> A and 50 </ b> B, the lens holding member 10, and the coil 60 are combined is already provided with the support member 6. The upper leaf spring 30 and the magnet M are inserted into the case 3 fixed from below. Then, the upward spring fixing surface 10a of the lens holding member 10 is abutted to the lower side of the movable side support portion 32 of the upper leaf spring 30, and the spring fixing surface 10a and the movable side support portion 32 are fixed with an adhesive. . Further, the support base 40 and the case 3 are also fixed to each other by an adhesive, and the lens driving device 1 is completed.

  In the present invention, when the laser Ls shown in FIG. 12 (A) is irradiated to the overlapping portion between the first connecting branch 121a of the leaf spring blank 120 and the second connecting branch 151 of the conductive plate blank 150, Only the first connecting branch 121a is melted, and the edge 25a of the first protrusion 25 formed as a result is welded to the second connecting branch 151. Thereafter, the second connecting branch 151 may be cut with a laser cutter or other cutting means.

  Further, when only the first connecting branch 121a of the leaf spring blank 120 is melted and the edge 25a of the first protruding portion 25 is welded to the second connecting branch 151 of the conductive plate blank 150, the fixed side support is supported. The first connecting branch 121a can be melted before the fixing process of the part and the conductive plate. That is, in the state shown in FIG. 8 in which the movable side support portion fixing step and the stacking step are performed, the first connecting branch portion 121a is irradiated with laser from the Z2 side, and the first connecting branch portion 121a is fused and secondly cut. You may weld with respect to the connection branch part 151. FIG.

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Case 3a Ceiling part 3b Opening part 6 Support member 7 Protrusion part 10 Lens holding member 10a, 10b Spring fixing surface 11 Flange part 12 Restriction protrusion part 20A, 20B Lower leaf | plate spring 21 Fixed side support part 21a, 21b Attachment Part 22 movable side support part 22a mounting hole 23 elastic arm parts 24a, 24b mounting hole 25 first projecting part 25a edge 30 upper leaf spring 31 fixed side support part 32 movable side support part 33 elastic arm part 40 support base 41A, 41B Spring fixing surface 42a, 42b Positioning protrusion 43 Through hole 44a, 44b Caulking deformation part 50A, 50B Conductive plate 52 Connection terminal 53 Hole 54 Second protrusion 54a Edge 60 Coil 120 Leaf spring blank 121a, 121b First connection branch Portions 122a and 122b Support plate 150 Conductive plate blank 151 Second connecting branch 152 Support plate M Stone Mg magnetized surface O optical axis

Claims (16)

A support base, a lens holding member on which a lens body can be mounted, and a lens holding member provided between the support base and the lens holding member so as to be movable in the optical axis direction of the lens body. A pair of leaf springs, a coil mounted on the lens holding member, and a magnet facing the coil,
Each of the leaf springs connects a fixed side support portion supported by the support base, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the lens driving device that has an elastic arm portion and the coil and the movable side support portion are electrically connected,
The fixed support portion and a conductive plate having connection terminals are overlapped and fixed to the support base, and an edge portion of the fixed support portion is welded to the conductive plate, and the conductive plate A lens driving device, wherein the coil can be energized through a pair of leaf springs.   The lens driving device according to claim 1, wherein the fixed side support portion is installed on a spring fixing surface formed on the support base, and the conductive plate is overlaid on the fixed side support portion.   A first protrusion is formed on the fixed support part, a second protrusion is formed on the conductive plate, the first protrusion and the second protrusion are overlapped, and an edge of the first protrusion is The lens driving device according to claim 2, wherein the lens driving device is welded to the second protrusion.   The lens driving device according to claim 3, wherein an edge of the first protrusion and an edge of the second protrusion are aligned vertically.   The lens driving device according to claim 3, wherein in the conductive plate, the connection terminal and the second projecting portion are provided adjacent to each other.   A lens driving device according to any one of claims 1 to 5, a lens body held by the lens holding member of the lens driving device, and an imaging element facing the lens body. Camera module. A support base, a lens holding member on which a lens body can be mounted, and a lens holding member provided between the support base and the lens holding member so as to be movable in the optical axis direction of the lens body. A pair of leaf springs, a coil mounted on the lens holding member, and a magnet facing the coil,
Each of the leaf springs connects a fixed side support portion supported by the support base, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the manufacturing method of the lens drive device which has an elastic arm part and the coil and the movable side support part are conducted,
Using a leaf spring blank in which the first connecting branch portion is continuous from the fixed side support portion, and a conductive plate blank in which the second connecting branch portion is continuous from the conductive plate having the connection terminal,
(A) a step of overlapping the fixed side support portion and the conductive plate so that the first connection branch portion and the second connection branch portion overlap each other;
(B) fusing the first connecting branch and welding the cut edge of the first connecting branch to the second connecting branch;
A method of manufacturing a lens driving device comprising: Between the step (a) and the step (b), the step of fixing the fixed side support portion and the conductive plate to the support base,
The method for manufacturing a lens driving device according to claim 7, wherein in the step (b), the first connecting branch portion and the second connecting branch portion are fused at the same time.   The lens according to claim 7 or 8, wherein the conductive plate is formed of a metal material having a plate thickness larger than that of the plate spring, and irradiates a laser on the first connecting branch side in the step (b). Manufacturing method of drive device.   10. The method according to claim 7, wherein, in the step (a), the fixed side support portion is installed on a spring fixing surface formed on the support base, and the conductive plate is stacked on the fixed side support portion. A method for manufacturing the lens driving device according to claim 1. The conductive plate is formed by bending the connection terminal,
When the fixed side support portion and the conductive plate are arranged on the spring fixing surface of the support base, the connection terminal is inserted into a through hole formed in the support base, and the connection terminal The method for manufacturing a lens driving device according to claim 10, wherein the front portion is exposed to the outside from the support base.   The method for manufacturing a lens driving device according to claim 11, wherein an adhesive is filled in the through hole.   The method for manufacturing a lens driving device according to claim 11, wherein the connection terminal and the second protrusion are formed adjacent to each other on the conductive plate.   12. A positioning projection is provided on the spring fixing surface of the support base, and the positioning projection is inserted into an attachment hole formed in the fixed side support portion and a hole portion formed in the conductive plate. 14. A method for manufacturing a lens driving device according to any one of claims 13 to 13.   The method of manufacturing a lens driving device according to claim 14, wherein a caulking deformation portion is formed on the positioning protrusion, and the fixing-side support portion and the conductive plate are caulked and fixed on the spring fixing surface.   The method for manufacturing a lens driving device according to claim 7, wherein the movable side support portion of the leaf spring is fixed to the lens holding member before the step (a).

Images