JP5153916B2 - Lens driving device and method of manufacturing lens driving device - Google Patents

Description

  The present invention relates to a small lens driving device mounted on a mobile phone with a camera and the like, and a method of manufacturing the lens driving device.

  Conventionally, as a small lens driving device, one that magnetically drives a lens holding member holding a lens in an optical axis direction is known (for example, see Patent Document 1). The lens driving device described in Patent Document 1 is configured by placing a lens holding member having a coil wound around its outer peripheral surface on a base member and covering the yoke from above. Magnets are respectively fixed to the inner side surfaces of the side wall portions of the yoke, and the magnets are positioned around the coils held by the lens holding member. In the lens driving device, a magnetic circuit is formed by the yoke and the magnet, and the lens holding member is moved in the optical axis direction by electromagnetic force generated by energization of the coil.

  A leaf spring for returning the lens holding member is disposed between the base member and the lens holding member. The leaf spring is divided into a pair of spring pieces, one end of the coil winding is connected to one spring piece, and the other end of the coil end is connected to the other spring piece. Each spring piece is welded to an external terminal fixed to the base member. Thus, the spring piece also functions as a power supply member for energizing the coil by connecting the coil and the external terminal.

JP 2010-061031 A

  However, in the lens driving device configured as described above, when the leaf spring is welded to the external terminal, the leaf spring may float from the installation surface of the external terminal, and it is difficult to reliably join the leaf spring to the external terminal. It was.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens driving device and a method of manufacturing the lens driving device capable of reliably bonding a leaf spring to an external terminal.

The lens driving device of the present invention includes a lens holding member that holds a lens body, a plate spring that supports the lens holding member so as to be movable in the optical axis direction, and fixes the plate spring, And a base member provided with an external terminal for achieving electrical continuity, and the leaf spring is formed with a joint piece extending toward the external terminal and positioned on the external terminal. A fixing position to be fixed to the base member is provided on the base end side, and a tip end region that can be pressed to the base member side is provided on the tip end side of the joining piece. A joint position where the joint piece is joined in close contact with the external terminal is provided between the fixed position of the joint piece and an opening or notch located on the external terminal. Part is formed, the joint The, characterized in that the joining position is provided on the inner edge of the opening or notch.

The method for manufacturing a lens driving device of the present invention is a method for manufacturing a lens driving device in which a lens holding member for holding a lens body is supported by a leaf spring so as to be movable in the optical axis direction, and an external terminal is provided on a base member. The fixing position is provided on the base end side of the joining piece formed on the leaf spring so as to extend toward the external terminal and to be positioned on the external terminal, and the fixing position is fixed to the base member. A joining position where the joining piece is joined to the external terminal is provided between the fixing region and the tip region on the tip side of the joining piece, and the pressing position provided in the tip region is the base. thereby pressing the member, the joining position possess and bonding in close contact to said external terminal, the step of bonding the bonding position to the external terminals, the distal end side than the fixing position of the joining pieces Formed opening The bonding position to the inner edge of the part or the notch, characterized in that is provided.

  According to these configurations, since the joining position is provided between the fixed position provided on the proximal end side of the joining piece and the pressing position provided on the distal end side, the joining position of the joining piece with respect to the external terminal can be prevented from floating. . Therefore, the joining piece can be brought into close contact with the external terminal, and the leaf spring and the external terminal can be reliably joined.

According to the present invention, in the lens driving device, an opening is formed on a distal end side of the joining piece, and an inner edge on a proximal end among inner edges facing the opening on the joining piece. The joining position is provided in the portion, and the pressing position is provided in a region along the inner edge on the tip side. In the method for manufacturing a lens driving device according to the present invention, the step of bonding the bonding position to the external terminal may include a tip of an inner edge portion opposed to the opening formed on a tip side of the bonding piece. The pressing position is provided in a region along the inner edge portion on the side, and the joining position is provided on the inner edge portion on the proximal end side. According to these configurations, it is possible to prevent floating of the joining position of the joining piece with respect to the external terminal by pressing one place in the region along the inner edge on the front end side across the opening. Therefore, it is not necessary to press the two positions on the tip side of the joining piece as in the case where the tip side of the joining piece is cut out and formed into two forks.
In addition, the lens driving device, the joining position is provided on the inner edge of the base end side of the opening or notch. Also, in the manufacturing method of the lens driving device, the joining position is provided on the inner edge of the base end side of the opening or notch.

  In the lens driving device according to the present invention, the fixing position of the joining piece is fixed to the base member by heat caulking. According to the present invention, in the method for manufacturing a lens driving device, in the step of fixing the fixing position to the base member, the fixing position is fixed to the base member by thermal caulking. According to these structures, the fixing position of the joining piece can be strongly fixed to the base member.

  In the lens driving device according to the present invention, the pressing position of the joining piece is pressed against the base member by a jig. In the method for manufacturing a lens driving device according to the present invention, in the step of bonding the bonding position to the external terminal, the pressing position is pressed against the base member with a jig. According to these configurations, the manufacturing of the lens driving device can be automated by pressing the pressing position of the joining piece against the base member using a jig.

  In the lens driving device according to the present invention, the joining position of the joining piece is joined to the external terminal by laser welding. In the method of manufacturing a lens driving device according to the present invention, in the step of joining the joining position to the external terminal, the joining position is joined to the external terminal by laser welding. According to these structures, a joining piece can be joined to an external terminal, without generating foreign materials, such as a solder ball. Therefore, it is possible to suppress the entry of foreign matter into the lens driving device.

  According to the present invention, it is possible to prevent the joining piece provided on the leaf spring from floating with respect to the external terminal, and to reliably join the leaf spring to the external terminal.

It is a whole perspective view of implementation of the lens drive device concerning the present invention. It is a disassembled perspective view of the lens drive device concerning this embodiment. It is an upper surface schematic diagram of a lower case and a spring piece according to the present embodiment. It is explanatory drawing of the joining method of the lower leaf | plate spring and external terminal which concern on this Embodiment. It is explanatory drawing of the first half of the assembly operation | work of the lens drive device which concerns on this Embodiment. It is explanatory drawing of the second half of the assembly operation | work of the lens drive device which concerns on this Embodiment. It is operation | movement explanatory drawing of the lens drive device which concerns on this Embodiment. It is a modification of the fixed piece which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following lens drive devices are examples, and are not limited thereto. In the lens driving device, the present invention can be applied as long as the plate spring and the external terminal are electrically connected.

  FIG. 1 is an overall perspective view of the lens driving device according to the present embodiment. FIG. 2 is an exploded perspective view of the lens driving device according to the present embodiment.

  As shown in FIGS. 1 and 2, the lens driving device 1 is mounted on a substrate on which an image sensor (not shown) is mounted, and drives a lens body (not shown) in the optical axis direction with respect to the image sensor. To adjust the focal length. In the lens driving device 1, a lens holding member 5 is attached via a lower leaf spring 4 (plate spring) on a lower case 2 (base member) in which an external terminal 31 is embedded. A coil 59 is wound around the lens holding member 5, and a yoke 7 with a magnet 6 is fixed to the lower case 2 so as to cover the coil 59. A top cover 9 is attached to the upper surface of the yoke 7 via an upper leaf spring 8.

  The lower case 2 is formed of a synthetic resin into a substantially rectangular frame shape when viewed from above. A circular opening 21 is formed at the center of the lower case 2, and the image sensor on the substrate is exposed upward through the opening 21. Protrusions 24 for fixing the lower leaf spring 4 are formed at the four corners of the lower case 2. The lower plate spring 4 is attached to the lower case 2 in a state where the protrusion 24 is positioned in the front-rear and left-right directions.

  The lower case 2 is insert-molded with a conductive metal plate 25. The metal plate 25 is exposed at the four corners of the lower case 2 and is electrically connected to the four corners of the yoke 7. A pair of external terminals 31 are insert-molded in the vicinity of two adjacent corners of the lower case 2. The pair of external terminals 31 are formed by bending a conductive metal plate, the upper plate portion 32 is exposed from the upper surface of the lower case 2, and the side plate portion 33 protrudes from the lower surface of the lower case 2. The upper plate portions 32 of the pair of external terminals 31 exposed from the lower case 2 are electrically connected to the lower plate spring 4. The metal plate 25 and the external terminal 31 are not electrically connected.

  The lower leaf spring 4 is made of conductive phosphor bronze or the like, and includes a pair of spring pieces 41. The pair of spring pieces 41 are arranged so as to form an opening in the center along the opening 21 of the lower case 2. Each spring piece 41 includes an outer plate portion 42 positioned on the radially outer side, an inner plate portion 43 positioned on the radially inner side, and a meandering spring plate portion 44 connecting the outer plate portion 42 and the inner plate portion 43. have. An insertion hole 46 is formed in the outer plate 42 corresponding to the protrusion 24 of the lower case 2, and an insertion hole is formed in the inner plate 43 corresponding to the protrusion 56 (see FIG. 5D) of the lens holding member 5. 45 is formed.

  The outer plate portion 42 is fixed to the lower case 2 by causing the protrusion 24 of the lower case 2 to protrude from the insertion hole 46 and heat caulking the protrusion 24. The inner plate portion 43 is fixed to the lens holding member 5 by thermal caulking of the protruding portion 56 with the protruding portion 56 of the lens holding member 5 protruding from the insertion hole 45. Thus, the lower case 2 and the lens holding member 5 are connected via the lower leaf spring 4. Further, the spring plate portion 44 of each spring piece 41 applies an urging force to the lens holding member 5 toward the lower case 2 side. The pair of spring pieces 41 are electrically joined to the pair of external terminals 31 and electrically joined to the end portion of the coil 59.

  The lens holding member 5 includes a cylindrical portion 52 that is formed of a synthetic resin and has an internal thread portion 51 formed on the inner peripheral surface thereof, and a flange portion 53 that protrudes radially outward from the lower end portion of the cylindrical portion 52. ing. A lens unit (not shown) having an external thread portion formed on the outer peripheral surface is mounted inside the cylindrical portion 52. Four coil support portions 54 that support the coil 59 from the inside protrude from the outer peripheral surface of the cylindrical portion 52. A cylindrical coil 59 is formed by winding a conducting wire around a coil support portion 54 provided in the cylindrical portion 52. In this case, a gap is formed between the coil 59 and the cylindrical portion 52 so that an inner wall portion 74 of the yoke 7 described later is interposed.

  A plurality of protrusions 56 for fixing the lower plate spring 4 and a pair of tangling pins 57 around which both ends of the coil 59 are wound are formed on the lower portion of the lens holding member 5 (see FIG. 5D). . One end portion of the coil 59 is joined to one spring piece 41 while being wound around one binding pin 57, and the other end portion of the coil 59 is wound around the other binding pin 57 in the other state. It is joined to the spring piece 41. In addition, four leg portions 58 that are in contact with the lower case 2 are formed under the lens holding member 5.

  The yoke 7 has a box shape with an open bottom surface, and a window portion 72 that exposes the cylindrical portion 52 of the lens holding member 5 is formed on the upper wall portion 71. The yoke 7 is formed with four inner wall portions 74 that are opposed to the four corners of the outer peripheral wall portion 73 that is rectangular when viewed from above. Each inner wall 74 is inserted through a gap between the coil 59 and the cylindrical portion 52. Magnets 6 are respectively attached to the four corners of the inner peripheral surface of the outer peripheral wall 73. The magnet 6 is formed in a substantially trapezoidal shape when viewed from above in accordance with the corner portion of the yoke 7, and has a magnetic pole surface parallel to the wall surface of the inner wall portion 74. Coils 59 are disposed between the magnet 6 and the inner wall 74 at the four corners of the yoke 7.

  Then, a magnetic circuit is formed by the yoke 7 and the magnet 6, and the lens holding member 5 is driven in the optical axis direction by energizing the coil 59. In addition, an edge 75 that is joined to the metal plate 25 of the lower case 2 is formed at the lower portion of the yoke 7. Insertion holes 76 for attaching the top cover 9 are formed at the four corners of the upper wall portion 71 of the yoke 7.

  The upper leaf spring 8 is formed of phosphor bronze or the like, and has an opening 81 having a smaller diameter than the window 72 of the yoke 7. The upper leaf spring 8 includes an outer plate portion 82 located radially outside, an inner plate portion 83 located radially inside, and a meandering spring plate portion 84 connecting the outer plate portion 82 and the inner plate portion 83. have. An insertion hole 85 is formed in the outer plate portion 82 corresponding to the insertion hole 76 of the yoke 7. The inner plate portion 83 is fixed to the upper end surface of the cylindrical portion 52 with an adhesive. The spring plate portion 84 of the upper plate spring 8 applies an urging force to the lens holding member 5 toward the lower case 2 side.

  The top cover 9 is formed in a rectangular frame shape from synthetic resin. At the four corners of the top cover 9, projections 91 for fixing the upper leaf spring 8 projecting from the lower surface are formed. The top cover 9 is integrated with the upper plate spring 8 and the yoke 7 by thermal caulking of the projection 91 in a state where the projection 91 is inserted into the insertion hole 85 of the upper plate spring 8 and the insertion hole 76 of the yoke 7. The Details of the assembling work of the lens driving device 1 will be described later.

  Here, with reference to FIG.3 and FIG.4, the joining method of a spring piece and an external terminal is demonstrated. FIG. 3 is a schematic top view of the lower case and the spring piece according to the present embodiment. FIG. 4 is an explanatory diagram of a method of joining the lower leaf spring and the external terminal according to the present embodiment. 4A and 4B show a joining method between the leaf spring and the external terminal according to the present embodiment, and FIGS. 4C and 4D show a joining method between the leaf spring and the external terminal according to the comparative example. 3 and 4, the lens holding member fixed to the spring piece is omitted for convenience of explanation.

  As shown in FIG. 3, the pair of spring pieces 41 is supplied in a state of being connected to the hoop material 93 (frame body), and is separated from the hoop material 93 after being fixed to the lower case 2. The outer plate portion 42 of the pair of spring pieces 41 has an elongated straight portion 66 extending along the outer surface of the lower case 2 and a pair of fixed pieces 67 fixed to the lower case 2 at both ends of the straight portion 66. doing. The pair of fixing pieces 67 extend obliquely so as to cross the diagonal line of the lower case 2, and are fixed to the protrusions 24 of the lower case 2 by heat caulking at a substantially half portion on the straight line portion 66 side. Further, the pair of fixed pieces 67 are connected to the inner plate portion 43 via meandering spring plate portions 44.

  Further, each fixing piece 67 is connected to the hoop material 93 via a connecting portion 69 extending on a substantially diagonal line of the lower case 2. An opening 68 is formed on the distal end side of the fixed piece 67 on one side, and is located on the upper plate portion 32 of the external terminal 31 exposed from the lower case 2. The fixed piece 67 is electrically connected to the external terminal 31 by laser welding the installation portion of the inner edge of the opening 68 and the external terminal 31. That is, one fixing piece 67 is a joining piece that extends from the fixing position with respect to the lower case 2 toward the external terminal 31 and is joined to the external terminal 31.

  More specifically, as shown in FIGS. 4A and 4B, the fixed piece 67 on one side extends obliquely toward the external terminal 31 and is fixed to the fixed position P1, the joint position P2, from the proximal end side to the distal end side, Each pressing position P3 is provided. The fixed position P <b> 1 is located on the base end side that is continuous with the linear portion 66. At the fixing position P1, the base end side of the fixing piece 67 is fixed to the lower case 2 by heat caulking. The joining position P <b> 2 is located on the inner edge 77 on the base end side of the inner edges 77 and 78 facing the opening 68 on the upper plate portion 32 of the external terminal 31. At the joining position P3, the distal end side of the fixed piece 67 is joined to the upper plate portion 32 by laser welding.

  The pressing position P <b> 3 is located in the narrow tip region 79 along the tip side inner edge 78 of the inner edges 77, 78 facing the opening 68 on the upper plate portion 32 of the external terminal 31. At the pressing position P <b> 3, the tip region 79 of the fixed piece 67 is pressed against the upper plate portion 32 by the metal jig 95. After the fixing piece 67 is fixed to the lower case 2 at the fixing position P1, the fixing piece 67 is joined to the upper plate portion 32 by laser welding at the joining position P2 while the pressing position P3 is held by the jig 95. The As described above, in the present embodiment, the fixing piece P2 is pressed against the upper plate portion 32 at the fixing position P1 and the pressing position P3 with the bonding position P2 interposed therebetween, so that the floating of the bonding position P2 is suppressed. 67 is joined to the external terminal 31. For this reason, the front end side of the fixed piece 67 is brought into close contact with the upper plate portion 32, and the fixed piece 67 and the external terminal 31 are reliably joined by laser welding.

  By the way, if it joins by soldering, even if the front end side of the fixed piece 67 floats, it can join to the upper board part 32 with a solder bridge. However, when joining by soldering, there is a possibility that unmelted solder paste may occur or foreign matters such as solder balls may be scattered. In this case, there is a problem that the foreign matter enters the lens driving device and the foreign matter is reflected in the image sensor. Further, since a soldering iron is used for soldering, it cannot be applied to a small lens driving device.

  In the present embodiment, the fixing piece 67 and the external terminal 31 are joined in a close contact state by laser welding, so that it is possible to cope with a small lens driving device without generating foreign matters during welding. . In addition, the tip region 79 of the fixed piece 67 can press a substantially intermediate position in the width direction of the fixed piece 67 with a jig 95. Thereby, the fixing piece 67 can be uniformly adhered to the upper surface of the upper plate portion 32 only by pressing one of the intermediate positions in the longitudinal direction of the distal end region 79.

  On the other hand, as shown in FIGS. 4C and 4D, the fixing piece 101 according to the comparative example is different from the fixing piece 67 according to the present embodiment in that an opening is not formed on the distal end side. The fixed piece 101 extends obliquely toward the external terminal 102, and is provided with a fixed position P1, a pressing position P3, and a joining position P2 from the proximal end side toward the distal end side. The fixing position P1 of the fixing piece 101 is located on the base end side connected to the linear portion 103, and is fixed to the lower case 104 by heat caulking. The pressing position P3 of the fixing piece 101 is located between the fixing position P1 and the joining position P2, and is pressed against the lower case 104 by a metal jig 105. The joining position P2 of the fixed piece 101 is located at the tip, and is joined to the upper plate portion 106 by laser welding.

  The fixing piece 101 is fixed to the lower case 104 at the fixing position P1, and then laser-welded at the joining position P2 in a state where the pressing position P3 is pressed by the jig 105. At this time, since the pressing position P3 is located on the base end side with respect to the distal end of the fixed piece 101, the fixed piece 101 is warped by the pressing of the jig 105, and the distal end side of the fixed piece 101 may float with respect to the upper plate portion 106. is there. As described above, in the fixed piece 101 according to the comparative example, it is difficult to reliably join the fixed piece 101 to the upper plate portion 106 by laser welding.

  In the present embodiment, the fixed position P1, the joining position P2, and the pressing position P3 are arranged on a substantially straight line. However, the present invention is not limited to this structure. The fixed position P1 may be positioned on the proximal end side of the fixed piece 67, the pressing position P3 may be positioned on the distal end side of the fixed piece 67, and the joining position P2 may be positioned between the fixed position P1 and the pressing position P3. .

  Next, the assembly operation of the lens driving device will be described with reference to FIG. FIG. 5 is an explanatory diagram of the first half of the assembling work of the lens driving device according to the present embodiment. FIG. 6 is an explanatory diagram of the latter half of the assembling work of the lens driving device according to the present embodiment. The following assembling work can be automatically performed by an automatic machine.

  As shown in FIG. 5A, the magnets 6 are respectively fixed to the corners of the four corners of the yoke 7 by an adhesive. At this time, the magnetic pole surface of the magnet 6 is opposed to the wall surface of the inner wall portion 74 of the yoke 7 with a predetermined interval (see FIG. 7). Next, as shown in FIG. 5B, the upper leaf spring 8 is placed on the upper surface of the yoke 7, and the top cover 9 is attached from above. At this time, the protrusions 91 at the four corners of the top cover 9 are respectively inserted into the four through holes 85 of the upper leaf spring 8 and the four through holes 76 of the yoke 7. Then, the top cover 9, the upper plate spring 8, and the yoke 7 are integrated with each other by thermally crimping the protrusions 91 of the top cover 9.

  On the other hand, as shown in FIG. 5C, a coil 59 is wound around the outer periphery of the lens holding member 5. Both end portions of the coil 59 wound around the lens holding member 5 are wound around a pair of binding pins 57. In this case, both ends of the coil 59 are wound after the insulating film is removed by a laser or the like.

  Next, as shown in FIG. 5D, a pair of spring pieces 41 is attached to the lower part of the lens holding member 5. The pair of spring pieces 41 is supplied to the lens holding member 5 in a state of being connected to the hoop material 93 via the connecting portion 69. At this time, the protrusions 56 of the lens holding member 5 are inserted into the insertion holes 45 of the pair of spring pieces 41, respectively. Then, the lens holding member 5 and the pair of spring pieces 41 are integrated by the caulking of the protrusion 56 of the lens holding member 5. Further, the end portion of the coil 59 wound around the binding pin 57 and the inner plate portion 43 of the pair of spring pieces 41 are laser soldered. Thereby, a pair of spring piece 41 and the both ends of the coil 59 are electrically connected.

  As shown in FIG. 6A, the lens holding member 5 with the coil 59 is placed on the lower case 2, and the lower case 2 and the lens holding member 5 are attached via a pair of spring pieces 41. At this time, the protrusion 24 of the lower case 2 is inserted into the insertion holes 46 of the pair of spring pieces 41, and the protrusion 24 is thermally crimped, whereby the lower case 2 and the lens holding member 5 are integrated. When the pair of spring pieces 41 are fixed to the lower case 2, the fixed pieces 67 of the pair of spring pieces 41 are joined to the upper plate portion 32 of the external terminal 31 by laser welding.

  In this case, the inner edge 77 located on the proximal end side of the opening 68 is laser-welded in a state where the distal end region 79 of the fixed piece 67 is pressed against the lower case 2 by the jig 95 (see FIG. 4A). Since the proximal end side of the fixed piece 67 is fixed to the lower case 2 and the distal end side of the fixed piece 67 is pressed against the lower case 2, laser welding is performed with the inner edge portion 77 positioned between them being in close contact with the upper plate portion 32. Is done. Thereby, the fixed piece 67 is reliably joined to the external terminal 31, and the pair of external terminals 31 and both ends of the coil 59 are electrically connected to both ends of the coil 59 via the pair of spring pieces 41. Is done.

  Next, as shown in FIG. 6B, the hoop material 93 is separated from the pair of spring pieces 41 by laser cutting. At this time, the laser beam is emitted toward the root portion of the connecting portion 69 located at the four corners of the lower case 2. Since the base portion of the connecting portion 69 faces the metal plate 25 exposed on the lower case 2, the laser beam is not irradiated to the resin molded portion of the lower case 2.

  When the hoop material 93 is separated from the pair of spring pieces 41, the yoke 7 with the top cover 9 is covered from above as shown in FIG. 6C. At this time, the inner wall portion 74 of the yoke 7 is inserted into the gap between the coil 59 of the lens holding member 5 and the cylindrical portion 52. As a result, at the four corners of the yoke 7, the inner wall 74 is interposed between the magnet 6 and the inner wall 74 to form a magnetic circuit. Further, the edge 75 of the yoke 7 is placed on the metal plate 25 of the lower case 2 and joined to the metal plate 25 located at the four corners of the lower case 2 by laser welding.

  Then, as shown in FIG. 6D, an adhesive is applied to the upper end surface of the cylindrical portion 52 and the inner plate portion 83 of the upper leaf spring 8 through the window portion 72 of the yoke 7. Thereby, the yoke 7 and the top cover 9 and the lens holding member 5 are connected via the upper leaf spring 8. The lens driving device 1 thus assembled is urged toward the lower case 2 by the leaf springs 4 and 8 provided on the upper and lower sides of the lens holding member 5. In the lens driving device 1, when the coil 59 around which the lens holding member 5 is wound is energized, the lens holding member 5 is moved in the optical axis direction against the urging force of the leaf springs 4 and 8.

  Hereinafter, the operation of the lens driving device will be described with reference to FIG. FIG. 7 is an operation explanatory diagram of the lens driving device according to the present embodiment.

  As shown in FIG. 7, the magnet 6 is fixed to the four corners of the outer peripheral wall portion 73 of the yoke 7, and the inner wall portion 74 is positioned so as to face the magnetic pole surface of the magnet 6. Is formed. A coil 59 wound around the lens holding member 5 is interposed between the magnet 6 and the inner wall portion 74. The magnetic circuit is formed so that the magnetic flux lines generated on the magnetic pole surface of the magnet 6 pass through the coil 59 toward the inner wall 74. The lens holding member 5 is pretensioned on the lower case 2 side by an upper leaf spring 8 and a lower leaf spring 4.

  When the coil 59 is energized in this initial state, an electromagnetic force is generated in the optical axis direction with respect to the coil 59. Due to the electromagnetic force generated in the coil 59, the lens holding member 5 moves in the optical axis direction against the urging force of the upper plate spring 8 and the lower plate spring 4, and a focal point between a lens body (not shown) and the image sensor. The distance is adjusted. In this case, since the inner wall portion 74 of the yoke 7 and the magnetic pole surface of the magnet 6 are parallel, the amount of magnetic flux lines passing through the coil 59 is large, and magnetic circuits are formed only at the four corners of the lens driving device 1. It is possible to generate a sufficient driving force. When the energization of the coil 59 is stopped, the lens holding member 5 is pulled back to the initial position by the restoring force of the upper leaf spring 8 and the lower leaf spring 4.

  As described above, according to the lens driving device 1 according to the present embodiment, the joint position P2 is provided between the fixed position P1 provided on the proximal end side of the fixed piece 67 and the pressing position P3 provided on the distal end side. Therefore, the floating of the joining position P2 of the fixing piece 67 with respect to the external terminal 31 can be prevented. Therefore, the fixing piece 67 can be brought into close contact with the external terminal 31, and the leaf spring 4 and the external terminal 31 can be reliably bonded.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the present embodiment, an opening is provided on the distal end side of the fixed piece as the joining piece, the inner edge portion on the proximal end side of the opening portion is set as the joining position, and the narrow portion along the inner edge portion on the distal end side of the opening portion is provided. Although the width region is the pressing position, the present invention is not limited to this configuration. Any configuration may be used as long as the pressing position is provided on the front side of the fixed piece on the opposite side of the fixed position with the joining position interposed therebetween. For example, as shown in FIG. 8A, the front end side of the fixing piece 111 is notched and formed into two forks, and a pressing position P3 is provided at each of the two forks, and a joining position is provided at the base end side edge of the notch 112. P2 may be provided. Further, as shown in FIG. 8B, the side of the fixed piece 115 is notched, and a pressing position P3 is provided in a region remaining on the tip side from the notch 116, and is joined to the edge on the proximal end side of the notch 116. The position P2 may be provided.

  Moreover, in this Embodiment, although the opening part was formed in the rectangular shape, it is not limited to this structure. The opening only needs to form a joining position with respect to the fixed piece as the joining piece. For example, the opening may be formed in a circular shape or an ellipse shape.

  Moreover, in this Embodiment, although the joining position and the press position were provided in the front end side of the fixed piece as a joining piece, it is not limited to this structure. The joining position may be provided between the fixed position and the pressing position, and may be provided, for example, at an intermediate position between the fixing position and the pressing position.

  In the present embodiment, the lower leaf spring and the external terminal are joined by laser welding, but the present invention is not limited to this configuration. As long as the lower leaf spring and the external terminal can be joined, the lower leaf spring and the external terminal may be joined by any method.

  In this embodiment, the lens driving device is assembled by an automatic machine. However, the present invention is not limited to this configuration. The lens driving device may be assembled manually, or the lens driving device may be assembled by combining an automatic machine and manual.

  Moreover, in this Embodiment, it is not limited to the above-mentioned assembly order. In the present embodiment, the lower plate spring is fixed to the lower case, and then the lower plate spring is joined to the external terminal. However, the present invention is not limited to this configuration. The lower plate spring may be fixed to the lower case after the lower plate spring is joined to the external terminal in a state where the base end side of the fixed piece is held down by the lower case.

  In this embodiment, the fixing position of the fixing piece as the joining piece is fixed to the lens holding member by thermal caulking. However, the present invention is not limited to this configuration. As long as the leaf spring can be fixed to the lens holding member, it may be fixed by any method.

  Moreover, in this Embodiment, although the pressing position of the fixed piece as a joining piece was pressed on the lower case, it is not limited to this structure. The pressing position may be pressed to the lower case side so that the joining position is in close contact with the external terminal.

1 Lens drive device 2 Lower case (base member)
4 Lower leaf spring (leaf spring)
5 Lens holding member 6 Magnet 7 Yoke 8 Upper leaf spring 9 Top cover 31 External terminal 32 Upper plate portion 41 Spring piece 59 Coil 66 Linear portion 67 Fixed piece (joint piece)
68 Opening 77, 78 Inner edge 79 Tip area 95 Jig

Claims (10)

A lens holding member for holding the lens body;
A leaf spring that supports the lens holding member so as to be movable in the optical axis direction;
A base member provided with an external terminal for fixing the leaf spring and electrically conducting the leaf spring;
The leaf spring is formed with a joining piece extending toward the external terminal and positioned on the external terminal.
A fixing position to be fixed to the base member is provided on the base end side of the joining piece, and a tip region that can be pressed to the base member side is provided on the tip side of the joining piece. Between the tip region, a joining position where the joining piece is joined in close contact with the external terminal is provided,
An opening or a notch is formed on the external terminal on the distal end side of the fixed position of the joining piece,
The lens driving device according to claim 1 , wherein the bonding position is provided at an inner edge portion of the opening or the notch . The lens driving apparatus according to claim 1 , wherein the joining position is provided at an inner edge portion on a proximal end side of the opening portion or the notch portion. The lens driving device according to claim 1 , wherein the fixing position of the joining piece is fixed to the base member by heat caulking. 4. The lens driving device according to claim 1 , wherein the joining position of the joining piece is joined to the external terminal by laser welding. 5. The lens driving device according to any one of claims 1 to 4 , wherein the tip region of the joining piece is pressed against the base member by a jig. A method for manufacturing a lens driving device in which a lens holding member for holding a lens body is supported by a leaf spring so as to be movable in an optical axis direction, and an external terminal is provided on a base member,
Providing a fixed position on the base end side of the joining piece formed on the leaf spring so as to extend toward the external terminal and to be positioned on the external terminal, and fixing the fixed position to the base member When,
A joining position where the joining piece is joined to the external terminal is provided between the tip region on the tip side of the joining piece and the fixing position, and the pressing position provided in the tip region is pressed toward the base member side. while, it possesses and bonding in close contact with the joining position to the external terminal,
The step of joining the joining position to the external terminal is characterized in that the joining position is provided at an inner edge of an opening or a notch formed on the distal end side of the fixed position of the joining piece. Manufacturing method. The method of manufacturing a lens driving device according to claim 6 , wherein the joining position is provided at an inner edge portion on a proximal end side of the opening portion or the notch portion. The method for manufacturing a lens driving device according to claim 6 , wherein the step of fixing the fixing position to the base member fixes the fixing position to the base member by thermal caulking. The method for manufacturing a lens driving device according to claim 6 , wherein the step of bonding the bonding position to the external terminal presses the pressing position against the base member with a jig. . The method for manufacturing a lens driving device according to claim 6 , wherein in the step of bonding the bonding position to the external terminal, the bonding position is bonded to the external terminal by laser welding. .

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