JP2012242647A - Lens drive device and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device and a manufacturing method for the lens drive device that can prevent damage of a lens holding member by heat by connecting a plate spring and a coil by a small quantity of heat.SOLUTION: In the manufacturing method for a lens drive device (1), a coil (59) is mounted around a lens holding member (5) for holding a lens body, a yoke (7) and a magnet (6) are provided so that a magnetic circuit acts on the coil (59) to move the lens holding member (5) in an optical axis direction, and the lens holding member (5) is supported by a bottom plate spring (4) in the optical axis direction. An end of the coil (59) is wound around a binding pin (57) provided in the lens holding member (5) and the end of the coil (59) wound around the binding pin (57) is electrically connected to the bottom plate spring (4) via solder paste (65) in the vicinity of a notch (63) formed in the bottom plate spring (4).

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 lower case and the lens holding member. The leaf spring is divided into two spring pieces. One end of the coil is connected to one spring piece, and the other end of the end of the coil is connected to the other spring piece. In this case, both ends of the coil are wound around a pair of binding pins press-fitted into the lower end of the lens holding member, and connected to each spring piece by welding or the like. Thus, the spring piece also functions as a conduction path for energizing the coil.

JP 2010-286532 A

  However, in the lens driving device as described above, since both ends of the coil and the leaf spring are connected by welding or the like, it is necessary to use a high heat resistance as a binding pin. Further, when a metal pin is used as the binding pin, there is a possibility that the binding pin falls off from the resin lens holding member due to heat transmitted to the binding pin during welding.

  The present invention has been made in view of such circumstances, and a lens driving device and a lens driving device capable of preventing damage to a lens holding member due to heat by connecting a leaf spring and a coil with a small amount of heating. An object is to provide a manufacturing method.

  The lens driving device according to the present invention includes a lens holding member that holds a lens body, a coil that is attached around the lens holding member, and a magnetic circuit that acts on the coil, and the lens holding member is disposed on an optical axis. A moving mechanism for moving in the direction and a biasing member for supporting the lens holding member in the optical axis direction, the lens holding member is provided with a binding pin around which an end of the coil is wound, The end of the coil wound around the binding pin is electrically joined to the urging member, and the urging member has a notch formed in the vicinity of the joint with the end of the coil. It is characterized by.

  In the manufacturing method of the lens driving device of the present invention, a coil is attached around a lens holding member that holds a lens body, and a magnetic circuit acts on the coil so that the lens holding member moves in the optical axis direction. A method of manufacturing a lens driving device in which a mechanism is provided and the lens holding member is supported by an urging member in the optical axis direction, the step of winding an end of the coil around a binding pin provided in the lens holding member And a step of electrically joining an end of the coil wound around the binding pin to the biasing member in the vicinity of the notch formed in the biasing member.

  According to these configurations, the notch portion formed in the urging member suppresses the escape of heat when the urging member and the coil end are joined, and the urging member and the coil end can be connected with a small amount of heating. Can be joined. Thereby, since the heat transmitted to the binding pin can be suppressed, damage to the binding pin due to heat can be prevented, and it is not necessary to form the binding pin with a heat resistant material. Further, when the binding pin is formed separately from the resin lens holding member, the binding pin can be prevented from falling off the lens holding member. The notch includes an opening formed by notching the urging member.

  According to the present invention, in the lens driving device, an end portion of a coil wound around the binding pin is joined to the urging member via a molten joining material. Further, according to the present invention, in the method for manufacturing the lens driving device, in the step of electrically bonding the end of the coil to the biasing member, the lens driving device is bonded via a molten bonding material. According to these configurations, the energizing member and the coil end can be joined by melting the molten joining material with a small amount of heating.

  According to the present invention, in the lens driving device, the binding pin is integrally formed of the same material as the lens holding member. According to this configuration, since heat transmitted to the binding pin is suppressed, even if the lens holding member and the binding pin are integrally formed of the same material, the binding pin is not damaged by heat. Further, the cost can be reduced by reducing the number of parts.

  In the lens driving device according to the present invention, the insulating film covering the surface of the end of the coil is peeled off. Moreover, this invention has the process of peeling the insulating film which covers the surface of the edge part of the said coil, before winding the edge part of the said coil around the said binding pin in the manufacturing method of the said lens drive device. According to these configurations, the urging member and the end portion of the coil can be satisfactorily bonded via the fusion bonding material.

  In the lens driving device according to the present invention, the urging member is fixed to the lens holding member. The present invention further includes a step of fixing the urging member to the lens holding member before joining the end of the coil to the urging member in the method for manufacturing the lens driving device. According to these configurations, since the urging member and the lens holding member are fixed, the urging member and the end of the coil can be favorably joined via the fusion bonding material.

  According to the present invention, it is possible to prevent damage to the lens holding member due to heat by connecting the leaf spring and the coil with a small amount of heating.

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 explanatory drawing of the junction part of the coil which concerns on this Embodiment, and a lower leaf | plate spring. It is the elements on larger scale of the junction part of the coil which concerns on this Embodiment, and a lower leaf | plate spring. 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.

  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 is applicable as long as the leaf spring and the end of the coil 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 (biasing member) on a lower case 2 to which an external terminal 3 is attached. A coil 59 is wound around the lens holding member 5, and a yoke 7 (moving mechanism) 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 in a thin box shape having a lower surface opened by a synthetic resin. A rectangular opening 21 is formed at the center of the upper wall portion of the lower case 2, and the image sensor on the substrate is exposed upward through the opening 21. Around the rectangular opening portion 21, an annular convex portion 22 that prevents foreign matter from entering the center side of the lower case 2 is formed. At the four corners of the upper wall portion of the lower case 2, positioning convex portions 23 for positioning the lower leaf spring 4 and projections 24 for fixing the lower leaf spring 4 are formed. The lower leaf spring 4 is attached to the lower case 2 in a state where it is positioned in the front-rear and left-right directions by the positioning convex portion 23 and the protruding portion 24.

  The lower case 2 is insert-molded with a conductive metal plate 25. The metal plate 25 is partially exposed from the lower case 2, and the yoke 7 is electrically connected. A pair of attachment holes 26 and protrusions 27 for attaching the pair of external terminals 3 are formed around two adjacent corners of the lower case 2. The pair of external terminals 3 is formed by bending a part of a conductive metal plate. The external terminal 3 is fixed to the lower case 2 by thermal caulking of the protruding portion 27 in a state where the bent side plate portion is inserted into the mounting hole 26 and the protruding portion 27 protrudes from the insertion hole 31 formed in the flat plate portion. The

  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 at the center along the annular convex portion 22 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. 3) 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 3 and are also joined to the end 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. An octagonal 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.

  The flange portion 53 is formed with a relief portion 55 that is cut out corresponding to the inner wall portion 74 of the yoke 7. The escape portion 55 prevents interference between the lower end portion of the inner wall portion 74 of the yoke 7 and the flange portion 53 when the lens holding member 5 is moved upward. 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. 3). . 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 (moving mechanisms) 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 trapezoidal shape in accordance with the corner of the yoke 7 and has a magnetic pole surface parallel to the wall surface of the inner wall 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 has an outer plate portion 82 located on the radially outer side, an inner plate portion 83 located on the radially inner side, and a spring plate portion 84 connecting the outer plate portion 82 and the inner plate portion 83. ing. A cutout portion 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 notch 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 junction part of a coil and a lower leaf | plate spring is demonstrated in detail. FIG. 3 is an explanatory diagram of a joint portion between the coil and the lower leaf spring according to the present embodiment. FIG. 4 is an enlarged view of FIG. 3 and 4 are views of the lower surface of the lens holding member as viewed from above.

  As shown in FIGS. 3 and 4, the inner plate portion 43 of the pair of spring pieces 41 extends in a semicircular shape, and is fixed to the lower surface of the lens holding member 5 at three locations in the extending direction. . The inner side plate part 43 is heat crimped in the fixed plate part 61a-61c of the both ends position of an extending direction, and an intermediate position. The fixed plate portion 61b at the intermediate position is cut away so as to avoid the binding pin 57 and the leg portion 58 protruding from the lower surface of the lens holding member 5. The fixing plate portion 61 b at the intermediate position is formed with a joint portion 62 that is joined to the end portion of the coil 59 along the binding pin 57. The joint portion 62 is formed so as to surround a substantially half portion around the binding pin 57.

  Further, a notch 63 is formed in the fixed plate 61b at the intermediate position. The notch 63 divides the fixing plate 61 b at the intermediate position into a joining part 62 side that is joined to the coil 59 and a fixing part 64 side that is secured to the lens holding member 5. The joint portion 62 side and the fixed portion 64 side of the fixed plate portion 61 b are connected by a connecting portion narrowed by the notch portion 63. In addition, the joint portion 62 is connected to the fixed plate portion 61a located on one end side by an arc-shaped elongated connecting portion. Thus, the spring piece 41 is formed so as to suppress the escape of heat in the joint portion 62 by soldering by narrowing the connecting portion.

  The ends of the coils 59 are wound around the pair of binding pins 57, respectively. In this case, the end of the coil 59 wound around the pair of binding pins 57 is stripped of the insulating film covering the surface. Then, after the insulating coating at the end of the coil 59 is peeled off and the spring piece 41 is fixed to the lens holding member 5 by heat caulking, the spring piece 41 is soldered to the end of the coil 59. For this reason, the adhesion between the end portion of the coil 59 and the solder paste 65 is enhanced, and the spring piece 41 is held in a stable posture with respect to the lens holding member 5. Can be satisfactorily joined by soldering.

  When soldering the joining portion 62 of the spring piece 41 and the end portion of the coil 59, the escape of heat at the joining portion 62 is suppressed by the notch portion 63 as described above. Therefore, the solder paste 65 can be melted by a small amount of heating of the solder paste 65. For this reason, it is possible to perform soldering between the joint portion 62 of the spring piece 41 and the end portion of the coil 59 while suppressing the temperature so as not to damage the binding pin 57. Further, since the binding pin 57 is prevented from being damaged, it is not necessary to form the binding pin 57 (lens holding member 5) from a heat resistant material.

  By the way, a slight gap L is formed between the inner edge portion of the joint portion 62 and the bare surface of the coil 59. The gap L is necessary when the spring piece 41 is installed on the lens holding member 5 by an automatic machine. In general, when a gap is formed between the coil and the joint, the solder paste is likely to spread, and there is a possibility that the joint and the end of the coil cannot be sufficiently joined. Specifically, the flux contained in the solder paste makes it easier for the solder paste to leave the coil surface, making it difficult to form a good solder bridge between the joint and the coil.

  However, in the spring piece 41 according to the present embodiment, the connecting portion between the joining portion 62 and the fixing portion 64 is formed narrow by the notch portion 63, and the solder paste from the joining portion 62 side to the fixing portion 64 side is formed. The spread of 65 is suppressed. Therefore, the solder paste 65 stays around the pin 57 and the adhesion between the joint 62 and the coil 59 is maintained, and a good solder bridge is formed between the joint 62 and the coil 59. As described above, in the lens driving device 1 according to the present embodiment, it is possible to prevent the binding pin 57 from being damaged and to solder the spring piece 41 and the end of the coil 59 satisfactorily. ing.

  In the present embodiment, the spring piece 41 is installed on the lens holding member 5 by an automatic machine. However, the present invention is not limited to this configuration. The spring piece 41 may be manually set to the lens holding member 5. In this case, it is preferable that the gap is not formed between the inner edge portion of the joint portion 62 and the bare surface of the coil 59.

  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 notches 85 at the four corners of the upper leaf spring 8 and the insertion holes 76 at the four corners 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. At this time, a winding jig 95 is attached to the lens holding member 5 via a relief portion 55 formed in the flange portion 53, and the winding of the coil 59 is prevented by the jig 95. In addition, both ends of the coil 59 are wound around the pair of binding pins 57 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. 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 joint portion 62 of the pair of spring pieces 41 are laser soldered. At this time, the notch 63 in the vicinity of the joint 62 prevents heat escape at the joint 62, and the solder paste 65 is melted with a small amount of heating. Further, the notch 63 in the vicinity of the joint 62 suppresses the diffusion of the solder paste 65, and a good solder bridge is formed between the coil 59 and the joint 62. Thereby, a pair of spring piece 41 and the both ends of the coil 59 are electrically connected.

  In addition, as shown in FIG. 6A, a pair of external terminals 3 are attached to the lower case 2. At this time, the external terminal 3 causes the side plate portion to be inserted into the mounting hole 26 of the lower case 2 and causes the protruding portion 27 of the lower case 2 to protrude from the insertion hole 31. And the lower case 2 and a pair of external terminal 3 are integrated by heat-caulking the protrusion part 27 of the lower case 2.

  As shown in FIG. 6B, the lens holding member 5 with the coil 59 is placed on the assembled lower case 2, and the lower case 2 and the lens holding member 5 are connected via the pair of spring pieces 41. It is attached. 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. The pair of spring pieces 41 are joined to the external terminals 3 by laser welding. Thereby, the pair of external terminals 3 and both ends of the coil 59 are electrically connected to both ends of the coil 59 via the pair of spring pieces 41.

  When the lower case 2 and the lens holding member 5 are integrated, as shown in FIG. 6C, the yoke 7 with the top cover 9 is covered from above. 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 coil 59 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 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 notch 63 formed in the spring piece 41 allows heat to escape during fusion bonding between the spring piece 41 and the end of the coil 59. It is suppressed, and the fusion bonding material can be melted with a small amount of heating, and the spring piece 41 and the end of the coil 59 can be bonded. Thereby, since the heat transmitted to the binding pin 57 can be suppressed, damage to the binding pin 57 due to heat can be prevented, and the binding pin 57 does not need to be formed of a heat resistant material.

  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, the binding pin is integrally formed of the same material as the lens holding member. However, the present invention is not limited to this configuration. The binding pin may be formed of a material different from the lens holding member and provided on the lens holding member. For example, the binding pin may be formed of metal and press-fitted into a synthetic resin lens holding member. Even in this case, since heat transmitted to the binding pin is suppressed, it is possible to prevent the binding pin from falling off the lens holding member.

  Further, in the present embodiment, the spring piece is cut out from the inner edge side to suppress the escape of heat at the time of fusion bonding between the spring piece and the coil end portion. However, the present invention is not limited to this configuration. The notch part should just be formed so that the escape of the heat | fever at the time of fusion | melting joining may be suppressed, for example, the opening part formed by notching a spring piece may be sufficient. The spring piece may be formed with a plurality of notches.

  Moreover, in this Embodiment, although it was set as the structure which joins the edge part of a coil to a pair of spring piece as an urging member, it is not limited to this structure. The urging member may be any member as long as it supports the lens holding member.

  In this embodiment, a magnetic circuit is formed by a magnet and a yoke as a moving mechanism, but the present invention is not limited to this configuration. The moving mechanism may have any configuration as long as it forms a magnetic circuit.

  In the present embodiment, the solder paste is exemplified as the melt bonding material, but the present invention is not limited to this configuration. The melt-bonding material may be any material as long as it can melt-bond the end of the coil and the biasing member.

  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. For example, after the end of the coil is wound around the binding pin, the insulating coating on the end of the coil may be peeled off. Further, the end of the coil may be joined to the biasing member before the biasing member is fixed to the lens holding member.

  In the present embodiment, the spring piece is fixed to the lens holding member by heat caulking, but is not limited to this configuration. Any method may be used as long as the urging member can be fixed to the lens holding member in a stable posture.

  In the present embodiment, the spring piece and the end of the coil are joined by laser soldering, but the present invention is not limited to this configuration. The urging member and the end of the coil may be joined in any manner as long as the joining method can prevent damage to the lens driving device at the time of joining the urging member and the end of the coil. For example, the urging member and the end of the coil may be joined by laser welding without using a fusion joining material such as a solder pace.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Lower case 3 External terminal 4 Lower leaf | plate spring (biasing member)
5 Lens holding member 6 Magnet (movement mechanism)
7 Yoke (movement mechanism)
8 Upper leaf spring 9 Top cover 41 Spring piece (biasing member)
42 Outer plate portion 43 Inner plate portion 44 Spring plate portion 45 Insertion hole 53 Flange portion 56 Projection portion 57 Tying pin 59 Coil 62 Joining portion 63 Notch portion 65 Solder paste (melting bonding material)
73 Outer wall part 74 Inner wall part

Claims (9)

A lens holding member for holding the lens body;
A coil attached around the lens holding member;
A moving mechanism that forms a magnetic circuit acting on the coil and moves the lens holding member in the optical axis direction;
An urging member that supports the lens holding member in the optical axis direction,
The lens holding member is provided with a binding pin around which an end of the coil is wound,
The end of the coil wound around the binding pin is electrically joined to the biasing member,
The lens driving device according to claim 1, wherein the biasing member has a notch formed in the vicinity of a joint portion with the end of the coil.   2. The lens driving device according to claim 1, wherein an end portion of a coil wound around the binding pin is joined to the urging member via a fusion bonding material.   The lens driving device according to claim 1, wherein the binding pin is integrally formed of the same material as the lens holding member.   The lens driving device according to any one of claims 1 to 3, wherein an insulating film covering a surface of an end portion of the coil is peeled off.   The lens driving device according to claim 1, wherein the biasing member is fixed to the lens holding member. A coil is attached around a lens holding member that holds the lens body, and a moving mechanism is provided so that a magnetic circuit acts on the coil to move the lens holding member in the optical axis direction. A method of manufacturing a lens driving device in which the lens holding member is supported by a member,
Winding the end of the coil around a binding pin provided on the lens holding member;
And a step of electrically joining an end of the coil wound around the binding pin to the urging member in the vicinity of the notch formed in the urging member. Manufacturing method.   The method for manufacturing a lens driving device according to claim 6, wherein in the step of electrically joining the end of the coil to the biasing member, the coil is joined via a melt-bonding material.   8. The lens driving device according to claim 6, further comprising a step of removing an insulating film covering a surface of the end portion of the coil before winding the end portion of the coil around the binding pin. 9. Production method.   The lens according to any one of claims 6 to 8, further comprising a step of fixing the biasing member to the lens holding member before joining an end of the coil to the biasing member. Manufacturing method of drive device.

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