JP5793027B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device suitable for an autofocus mechanism or the like in a digital camera.

  Conventionally, in a lens driving device used for an autofocus mechanism or the like in a digital camera, a lens holder that holds a lens body is moved along the optical axis direction by a moving mechanism including a magnet, a coil, and a yoke. (For example, refer to Patent Document 1). In this lens driving device, a coil previously bundled in a ring shape is bonded and fixed to the outer peripheral surface of a lens holder that holds a lens body, and a magnetic field from a magnet fixed to the inner wall surface of the yoke is applied to the lens. The holder is moved along the optical axis direction.

JP 2008-33252 A

  However, in the lens driving device described above, since the coil is bonded and fixed to the outer peripheral surface of the lens holder, it is necessary to wait for the adhesive to solidify, and the time required for assembling the lens driving device cannot be shortened. There is. Moreover, there exists a problem that an adhesive agent can be scattered with the adhesion fixation of the coil with respect to a lens holder. Such scattering of the adhesive causes problems such as hindering smooth movement of the lens holder and deterioration of pixel accuracy of the image sensor.

  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 that can be efficiently assembled without causing the adverse effects of using an adhesive.

The lens driving device of the present invention includes a lens holding unit that holds a lens body, a magnet, a coil, and a yoke, a moving mechanism that moves the lens holding unit along the optical axis direction, and the lens holding unit that is elastic. An elastic member for holding the lens , wherein the yoke is formed in a box shape having a plurality of side portions, and the outer periphery of the lens holding means is opposed to the side portions of the yoke. A plurality of holding pieces each having a flat portion are provided, and a hook-like portion is provided on the end side in the optical axis direction, and the flat portion of the holding piece is located at a position spaced apart from the hook-like portion by a certain distance in the optical axis direction. positioning piece facing the flange portion is provided across, Oite between the positioning piece and the flange portion, along the flat portion of the retaining piece, in the coil the lens holding means has been turned directly winding, said Flat portion of the coil which is held on the flat portion of the supporting pieces is characterized that you have been placed directly opposite the side surface portion of the yoke.

  According to the lens driving device, since the coil is directly wound between the hook-shaped portion provided in the lens holding means and the positioning piece, the coil is fixed to the lens holding means without using an adhesive. Therefore, it is possible to assemble efficiently without causing the harmful effects associated with the use of the adhesive. In addition, since the fixing piece for fixing the elastic member is provided on one surface of the bowl-shaped portion, the size of the fixing piece can be increased to some extent. For example, the lens holding means main body (for example, the cylinder constituting the lens holding means) The elastic member can be firmly fixed to the lens holding means as compared with the case where the elastic member is bonded and fixed to the end surface of the shape portion.

In the lens driving device, it is preferable that the positioning piece is formed to protrude outward from the outer periphery of the lens holding means, and the tip of the positioning piece is located outside the coil. It is preferable that the front end portion of the positioning piece is formed in a straight line along the flat portion of the holding piece. The width dimension of the flat part of the coil in the direction orthogonal to the optical axis direction is formed larger than the width dimension of the flat part of the holding piece, and both ends of the flat part are larger than both ends of the flat part. Is preferably located outside. Further, the plurality of holding pieces are formed to protrude outward from the outer periphery of the lens holding means, and a portion positioned between the adjacent flat portions of the coil is separated from the outer peripheral surface of the lens holding means. It is preferable. In this case, the yoke has an upper surface portion with an opening formed at the center, and an arcuate hanging wall surface hangs at positions corresponding to the plurality of corners of the yoke at the peripheral edge of the opening. Preferably, the hanging wall surface is disposed between a portion located between the adjacent flat portions of the coil and the outer peripheral surface of the lens holding means.

  Further, in the lens driving device, a fixing piece for fixing the elastic member may be provided on the outer surface of the bowl-shaped portion through a hole formed in the elastic member. In this case, since the fixing piece for fixing the elastic member is provided on one surface of the bowl-shaped portion, the size of the fixing piece can be configured to be somewhat large. For example, the lens holding means main body (for example, the lens holding means The elastic member can be firmly fixed to the lens holding means as compared with the case where the elastic member is bonded and fixed to the end surface of the cylindrical portion to be configured.

  In particular, in the lens driving device, it is preferable that the elastic member is fixed to the lens holding means by thermally deforming the fixing piece. In this case, since the elastic member is fixed by thermal deformation of the fixing piece, it is possible to shorten the time until the elastic member is fixed and to shorten the time required for the assembly work as compared to the case of adhesive fixing. Become.

  Furthermore, in the lens driving device, it is preferable that a protruding piece on which an end of the coil is entangled is provided on one outer surface of the bowl-shaped portion. In this case, since the end of the coil can be entangled with the protruding piece provided in the bowl-shaped portion, the lens holding means is assembled to another member (for example, a part of the housing of the lens driving device). It is possible to prevent the end of the coil from being damaged in the process or the like.

  For example, in the lens driving device, the protruding piece is inserted through a hole formed in the elastic member, and an end portion of the coil entangled with the protruding piece is joined to the elastic member. In this case, since the end of the coil is connected to the elastic member in a state of being entangled with the protruding piece, the efficiency of the joining operation can be improved.

  In particular, in the lens driving device, the protruding piece has a base portion provided on the flange-like portion side, and an extending portion provided extending from the base portion and having a shape narrower than the base portion, It is preferable that an end portion of the coil is entangled with the extension portion. In this case, since the end portion of the coil is entangled with the extending portion, it is possible to prevent a situation where the position of the coil starts to vary, so that the end portion of the coil can be arranged at a fixed position on the protruding piece. It is possible to perform the joining operation with the elastic member appropriately and efficiently.

  Further, in the lens driving device, the protruding piece is provided to protrude from a recessed portion formed by being recessed in the surface of the bowl-shaped portion, and the base portion is disposed in the recessed portion, while the extending portion Protrudes outward from the surface of the bowl-shaped portion, and the coil is entangled so that the end of the coil is disposed on the distal end side of the extending portion from the position on the base side of the extending portion. Preferably. For example, when solder plating is applied to the coil in order to solder the end of the coil to the elastic member, the length to which the solder plating is applied varies although the end of the coil is appropriately plated with solder. It is assumed that this will happen. In the above configuration, since the coil is entangled from the position on the base side in the extension part of the protruding piece so that the end part of the coil is disposed on the tip side of the extension part, solder plating is appropriately performed. Since the end part of the coil to be arranged can be arranged at the joint portion with the elastic member, the end part of the coil and the elastic member can be appropriately joined.

  According to the present invention, since the coil is directly wound between the hook-shaped portion provided in the lens holding means and the positioning piece, the coil can be fixed to the lens holding means without using an adhesive. Therefore, it is possible to assemble efficiently without causing the harmful effects associated with the use of the adhesive.

It is a disassembled perspective view of the lens drive device which concerns on one embodiment of this invention. It is a disassembled perspective view of the lens drive device concerning the above-mentioned embodiment. It is a perspective view of the state where the coil was wound around the lens holder which the lens drive device concerning the above-mentioned embodiment has. It is a figure for demonstrating the state of the coil of the process wound by the lens holder which the lens drive device which concerns on the said embodiment has. It is a figure for demonstrating the state which attached the lower leaf | plate spring to the lens holder which the lens drive device which concerns on the said embodiment has. It is a perspective view of the state which attached the lens holder which the lens drive device concerning the above-mentioned embodiment has to a base member. It is a perspective view which shows the external appearance of the lens drive device which concerns on the said embodiment. It is a top sectional view of the lens drive device concerning the above-mentioned embodiment. It is a perspective view for demonstrating operation | movement of the lens drive device which concerns on the said embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are exploded perspective views of a lens driving device 1 according to an embodiment of the present invention. In FIG. 1, the lens driving device 1 according to the present embodiment is shown from above, and in FIG. 2, the lens driving device 1 according to this embodiment is shown from below.

  As shown in FIGS. 1 and 2, a lens driving device 1 according to the present embodiment includes a base member 2 constituting a bottom surface portion of the device and a lens holder 3 as a lens holding means for holding a lens body (not shown). And magnets 4a to 4d, a coil 5 and a yoke 6 constituting a moving mechanism for moving the lens holder 3 in the optical axis direction, and a pair of leaf springs for elastically fixing the lens holder 3 to the base member 2 and the yoke 6. (Lower leaf spring 7, upper leaf spring 8) and a cover member 9 that fixes the upper leaf spring 8 to the yoke 6.

  The base member 2 is formed of, for example, an insulating resin material and is provided in a rectangular shape. A rectangular opening 21 is formed near the center of the base member 2 at a position corresponding to an image sensor (not shown). In addition, projecting pieces 22 a to 22 d for fixing the lower leaf spring 7 are erected in the vicinity of the four corners of the base member 2. These protruding pieces 22a to 22d are fixed by being deformed by heat caulking or the like while being inserted through holes 71a of the lower leaf spring 7 described later. In addition, in FIG. 1, it has shown about the state by which these protrusion pieces 22a-22d were deform | transformed. In the vicinity of the center of each side of the base member 2, reference surfaces 23a to 23d used for positioning the lens holder 3 are provided. These reference surfaces 23a to 23d are provided in a flat shape, and projecting pieces 38a to 38d of a lens holder 3 to be described later are brought into contact with each other and used for positioning.

  The base member 2 is insert-molded with a metal plate 10 used for fixing the yoke 6 with a part thereof exposed. The metal plate 10 has a U-shape that opens on the side where the reference surface 23a is disposed, and includes fixing portions 101a to 101d that protrude from the side surfaces at positions corresponding to the four corners of the base member 2. ing. The yoke 6 is fixed to the base member 2 by fixing the lower end portion of the yoke 6 to the fixing portions 101a to 101d by laser welding or the like. The base member 2 is insert-molded with a pair of metal plate members 11 used for conductive connection of the lower leaf spring 7 with a part thereof exposed. These metal plate members 11 are arranged inside the side where the reference surface 23 a is arranged, and each has a connection portion 111 a exposed on the upper surface of the base member 2 and a connection piece 111 b protruding from the lower surface side of the base member 2. doing. A part of the lower leaf spring 7 fixed to the base member 2 is connected to the connecting portion 111a by soldering or the like, so that the lower leaf spring 7 is conductively connected.

  The lens holder 3 is formed of, for example, an insulating resin material, and is generally provided in a cylindrical shape. On the outer peripheral surface of the lens holder 3, there are provided four holding pieces 31a to 31d that protrude outward in the radial direction of the lens holder 3 and hold the coil 5 (in FIGS. 1 and 2, holding pieces 31c and 31d are Not shown). Planar portions are formed on the surfaces of the holding pieces 31a to 31d. In addition, positioning pieces 32a to 32d are provided at the upper ends of the holding pieces 31a to 31d to restrict the upward movement of the coil 5 and perform positioning thereof. Further, above these positioning pieces 32a to 32d, projecting pieces 33a to 33d that project radially outward from the outer peripheral surface of the lens holder 3 are provided. Further, positioning pieces 34 a to 34 d for positioning the upper leaf spring 8 are provided at the upper ends of the protruding pieces 33 a to 33 d. These positioning pieces 34a to 34d are erected upward from the protruding pieces 33a to 33d, and are configured to be engageable with a notch 82a of the upper leaf spring 8 described later. The upper leaf spring 8 is fixed to the lens holder 3 by heat caulking the protruding pieces 33 a to 33 d to the upper leaf spring 8 in a state of being engaged with the notch portion 82 a of the upper leaf spring 8. The lens body (not shown) is attached to the lens holder 3 by being screwed into a thread groove provided on the inner periphery of the lens holder 3, for example.

  Further, a flange 35 is provided at the lower end of the lens holder 3 so as to extend radially outward from the outer peripheral surface. The flange portion 35 is provided in a flange shape with respect to the lens holder 3, and is provided apart from the positioning pieces 32 a to 32 d by a certain distance in the optical axis direction. Moreover, while the upper surface of the bowl-shaped portion 35 constitutes a plane parallel to the positioning pieces 32a to 32d, a flat surface 36 is provided on the lower surface thereof. On the flat surface 36, a plurality of fixing pieces 37 a to 37 d for fixing the lower leaf spring 7 and a plurality of projecting pieces used for positioning the lens holder 3 in contact with the reference surfaces 23 a to 23 d of the base member 2. 38a to 38d are provided. Of these projecting pieces 38a to 38d, the projecting pieces 38b and 38d constitute projecting pieces on which both end portions 5a and 5b of the coil 5 described later are bound. These protruding pieces 38b and 38d are provided in concave portions 39a and 39b formed on the lower surface of the bowl-shaped portion 35 (omitted in FIG. 2, see FIG. 3B). The lower surfaces of the recesses 39 a and 39 b extend horizontally with the flat surface 36 at a position above the flat surface 36. As will be described later, these projecting pieces 38b and 38d are provided with a base 381 provided on the flange-like portion 35 side and a lower side extending from the base 381 and having a shape narrower than that of the base 381. And a protruding portion 382 (omitted in FIG. 2, see FIG. 4B).

  The magnets 4 a to 4 d have a pair of side surface portions 41 and 42 that are orthogonal to each other and an inner peripheral surface portion 43 having an arc shape, and are fixed to the four corner portions of the yoke 6. In this case, the magnets 4a to 4d make the side surface portions 41 and 42 face the inner wall surfaces at the four corners of the yoke 6, and the inner peripheral surface portion 43 is sandwiched by a certain distance from the inner wall surfaces of the hanging wall surfaces 63a to 63d of the yoke 6 described later. (See FIG. 8).

  The coil 5 is directly wound around holding pieces 31 a to 31 d provided on the outer peripheral surface of the lens holder 3. By being wound around the holding pieces 31a to 31d, the coil 5 is in a state of being bundled in a generally annular shape in which portions corresponding to the holding pieces 31a to 31d are arranged linearly. A winding method around the lens holder 3 (holding pieces 31a to 31d) will be described later. Both end portions 5a and 5b of the coil 5 are pulled out to the lower surface side of the bowl-shaped portion 35 of the lens holder 3, and are entangled with the projecting pieces 38b and 38d. 1 and 2 show a state in which these both end portions 5a and 5b are entangled with the protruding pieces 38b and 38d.

  The yoke 6 is formed by machining a metal material and has a box shape opened to the lower side shown in FIG. Further, the yoke 6 is provided in a generally rectangular shape, and a circular opening 61 is provided in the center thereof. Fixing pieces 62 a to 62 d that slightly protrude to the side are provided at the lower ends of the four corners of the yoke 6. These fixing pieces 62 a to 62 d are provided with dimensions that can be placed on the fixing portions 101 a to 101 d of the metal plate 10 protruding from the four corners of the base member 2. Hanging wall surfaces 63 a to 63 d are provided at positions corresponding to the four corner portions of the yoke 6 at the peripheral edge of the opening 61. These hanging wall surfaces 63 a to 63 d are arranged between the outer peripheral surface of the lens holder 3 and the inner peripheral surface of the coil 5 in a state where the lens holder 3 is accommodated. Furthermore, recessed portions 64 a to 64 d that can accommodate the protruding pieces 33 a to 33 d of the lens holder 3 are provided at positions between the hanging wall surfaces 63 a to 63 d at the peripheral edge of the opening 61. A pair of contact pieces 65a to 65d that slightly protrude toward the inside of the opening 61 are provided on the sides of the recesses 64a to 64d. Further, in the vicinity of the four corners on the upper surface of the yoke 6, holes 66a to 66d into which a fixing pin 92 of the cover member 9 described later is inserted are provided.

  The lower leaf spring 7 constitutes an elastic member. For example, the lower leaf spring 7 is made of a conductive material such as phosphor bronze, and is fixed to the lower surface of the lens holder 3 and a pair of outer fixing portions 71 fixed to the base member 2. A pair of inner fixing portions 72, and four arm portions 73 connecting the outer fixing portion 71 and the inner fixing portion 72. A plurality of holes 71 a are provided at predetermined positions of the outer fixing portion 71, and the lower leaf spring 7 is fixed to the base member 2 with the protruding pieces 22 a to 22 d of the base member 2 being inserted into these holes 71 a. . In addition, a plurality of holes 72a are provided at predetermined positions of the inner fixing portion 72, and the lower leaf spring 7 is fixed to the lens while the fixing pieces 37a to 37d provided on the lower surface of the lens holder 3 are inserted into the holes 72a. It is fixed to the holder 3. The arm portion 73 is connected to the inner fixing portion 72 by being bent back multiple times from the position of the outer fixing portion 71 corresponding to the four corner portions of the base member 2.

  Similarly to the lower leaf spring 7, the upper leaf spring 8 is made of a conductive material such as phosphor bronze and has an outer fixed portion 81 having a ring shape fixed to the upper surface of the yoke 6, and the upper surface of the lens holder 3. An inner fixing portion 82 having an annular shape that is fixed to each other, and four arm portions 83 that connect the outer fixing portion 81 and the inner fixing portion 82. Four holes 81 a are provided at predetermined positions of the outer fixing portion 81, and the upper leaf spring 8 is fixed to the yoke 6 with a fixing pin 92 of a cover member 9 (described later) being inserted into these holes 81 a. Further, four cutout portions 82a are provided at predetermined positions of the inner fixing portion 82, and the upper leaf spring 8 is placed in the lens holder 3 in a state where the positioning pieces 34a to 34d of the lens holder 3 are accommodated in these cutout portions 82a. It is fixed to. The arm portion 83 is connected to the inner fixing portion 82 by being bent back multiple times from the position of the outer fixing portion 81 corresponding to the four corner portions of the yoke 6.

  The cover member 9 is formed by machining a metal material. The cover member 9 is provided in a generally rectangular shape, and a circular opening 91 is provided in the center thereof. The cover member 9 has substantially the same shape as the outer shape of the upper surface of the yoke 6, and is configured such that the opening 91 faces the opening 61 of the yoke 6. Four fixing pins 92 for fixing the upper leaf spring 8 to the upper surface of the yoke 6 are provided on the lower surface of the cover member 9 at positions corresponding to the four corner portions.

  When assembling the lens driving device 1 having such a configuration, first, the coil 5 is wound around the lens holder 3. FIG. 3 is a perspective view of a state in which the coil 5 is wound around the lens holder 3 included in the lens driving device 1 according to the present embodiment. In FIG. 3B, the lens holder 3 around which the coil 5 is wound is shown from the lower side, and the vertical direction is shown reversed for convenience of explanation. FIG. 4 is a view for explaining the state of the coil 5 in the process of being wound around the lens holder 3. FIG. 4A shows a cross section of the lens holder 3 and the coil 5. FIG. 4B shows a cross section in the vicinity of the protruding piece 38 of the lens holder 3.

  As shown in FIG. 3, the coil 5 is wound around the holding pieces 31 a to 31 d between the positioning pieces 32 a to 32 d of the lens holder 3 and the flange portion 35. In this case, since the holding pieces 31a to 31d are formed so as to protrude slightly in the radial direction from the outer peripheral surface of the lens holder 3, the coil 5 is formed between the holding pieces 31a to 31d. The lens holder 3 is disposed in a state separated from the outer peripheral surface of the lens holder 3 by a certain distance.

  Here, a method of winding the coil 5 around the lens holder 3 will be described. For example, as shown in FIG. 4A, the coil 5 is wound around the lens holder 3 (holding pieces 31a to 31d) using jigs A1 to A4 arranged between the holding pieces 31a to 31d. A flat surface portion A5 is provided on the outer surface of the end portion of each jig A1 to A4. These plane portions A5 are arranged on the same plane as the plane portions formed on the surfaces of the adjacent holding pieces 31a to 31d. For example, as shown in FIG. 4A, the plane part A5 on the holding piece 31c side of the jigs A2 and A3 is arranged on the same plane as the plane part formed on the surface of the holding piece 31c.

  The coil 5 is wound around the holding pieces 31a to 31d in a state where the jigs A1 to A4 thus configured are arranged between the holding pieces 31a to 31d. Since it is possible to receive a tightening force generated at the time of winding at the flat surface portion A5 of the jigs A1 to A4, it is possible to reliably prevent a situation in which the stress accompanying the tightening force is applied to the lens holder 3 (holding pieces 31a to 31d). Can do. For this reason, it is possible to prevent the lens holder 3 from being deformed as the coil 5 is wound, and to prevent a situation where the lens is difficult to enter when the lens is incorporated into the lens holder 3.

  In the lens driving device 1 according to the present embodiment, a heat-welding resin is coded on the surface of the wire constituting the coil 5. The wire 5 is wound around the lens holder 3 (holding pieces 31a to 31d) while being heated to a temperature at which the resin is welded, whereby the coil 5 is formed. When the winding is completed, heating to the coil 5 (wire) is stopped, and the coil 5 (wire) is solidified in the wound shape. In such a solidified state, the coil 5 is disposed so as to be sandwiched between the positioning pieces 32 a to 32 d and the bowl-shaped portion 35, and is fixed to the lens holder 3. The jigs A1 to A4 are removed after the coil 5 is solidified.

  Here, the configuration in which the flat portion A5 is provided at the ends of the jigs A1 to A4 so that the stress accompanying the tightening of the coil 5 is not applied to the lens holder 3 is described. However, the configuration of the jigs A1 to A4 is not limited to this and can be changed as appropriate. Any configuration can be adopted on condition that the stress accompanying the tightening at the time of winding of the coil 5 is not applied to the lens holder 3. For example, when the lens holder 3 has strength, the jigs A1 to A4 (jigs not having the flat surface portion A5) are arranged between the plurality of holding pieces 31a to 31d, and the coil 5 is simply wound. However, the lens holder 3 can be configured so that stress accompanying tightening when the coil 5 is wound is not applied to the lens holder 3. Also in this case, since it is possible to restrict a tightening force of a certain value or more from the coil 5 to the plurality of holding pieces 31a to 31d during winding, a situation in which the stress accompanying the tightening of the coil 5 is applied to the lens holder 3 can be prevented. It can be effectively prevented.

  Further, the end portions 5a and 5b of the coil 5 wound around the lens holder 3 are entangled with and held by the protruding pieces 38b and 38d provided in the concave portions 39a and 39b of the bowl-shaped portion 35. . The ends 5 a and 5 b of the coil 5 wound around the lens holder 3 are entangled with the protruding pieces 38 b and 38 d, so that the ends 5 a and 5 b of the coil 5 are assembled in the process of assembling the lens holder 3 to the base member 2. Can be prevented from being damaged.

  In this case, the coil 5 is wound from the position on the base 381 side of the extending portion 382 shown in FIG. 4B of the protruding piece 38b (38d). More specifically, the coil 5 is entangled so that the end 5 a (5 b) is arranged on the distal end side of the extension 382 a predetermined number of times from the lower end of the extension 382. In this way, by tangling from the lower end of the extending part 382, it is possible to prevent a situation where the position of the coil 5 at the beginning of entanglement varies. As a result, the end portion 5a (5b) of the coil 5 can be arranged at a fixed position in the protruding piece 38b (38d), so that the soldering with the lower leaf spring 7 can be performed appropriately and efficiently.

  By winding the coil 5 directly around the lens holder 3 in this way, the coil 5 can be fixed to the lens holder 3 without using an adhesive. In addition, the lens holder 3 is designed without any restrictions required when the coil 5 is fitted into the lens holder 3 after being bundled into an annular shape (for example, the restriction that the flange 35 cannot be provided). And the degree of freedom of design can be ensured.

  Further, since a flat surface 36 having a certain width in the radial direction can be formed on the lower surface of the bowl-shaped portion 5, as described above, a plurality of fixing pieces 37a for fixing the lower leaf spring 7 are provided. To 37d and a plurality of protruding pieces 38a to 38d used for positioning the lens holder 3 can be provided. If the coil 5 is fitted into the lens holder 3 after being bundled into an annular shape, the hook-shaped portion 5 cannot be provided, so that these fixed pieces 37a to 37d and the protruding pieces 38a to 38d are attached. If it is to be provided, it must be provided at the lower end portion of the lens holder 3. In this case, a situation may occur in which sufficient space for the fixing pieces 37a to 37d and the protruding pieces 38a to 38d cannot be secured. Alternatively, since it is necessary to give a certain thickness to the lower end portion of the lens holder 3 in order to ensure a sufficient space, it is necessary to reduce the lens diameter and enlarge the external dimensions of the apparatus main body.

  After the coil 5 is wound around the lens holder 3 in this way, the lower leaf spring 7 is attached to the lens holder 3. FIG. 5 is a diagram for explaining a state in which the lower leaf spring 7 is attached to the lens holder 3 included in the lens driving device 1 according to the present embodiment. 5A shows a perspective view of the lens holder 3 with the lower leaf spring 7 attached thereto. FIG. 5B shows a cross section in the vicinity of the protruding piece 38 b of the lens holder 3. In FIG. 5A, as in FIG. 3B, the lens holder 3 is shown from below, and for convenience of explanation, the vertical direction is shown reversed.

  As shown in FIG. 5A, the lower leaf spring 7 is attached to the lens holder 3 so that the fixing pieces 37 a to 37 d provided in the flange-like portion 35 pass through the holes 72 a of the inner fixing portion 72. And the lower leaf | plate spring 7 is fixed to the flat surface 36 of the bowl-shaped part 35 by applying heat to the fixing piece 37a-37d which penetrated the hole 72a, and making it deform | transform (heat caulking). Note that the protruding pieces 38a to 38d provided in the bowl-shaped portion 35 are located on the lower side (the upper side shown in FIG. 5A) from the opening provided between the outer fixing portion 71 and the inner fixing portion 72 of the lower leaf spring 7. Side).

  In this way, the fixing pieces 37a to 37d provided in the bowl-shaped portion 35 are inserted into the holes 72a, and these fixing pieces 37a to 37d are thermally deformed to fix the lower leaf spring 7 to the flat surface 36. The lower leaf spring 7 can be fixed to the lens holder 3 without using the above. In particular, since the lower leaf spring 7 is fixed by the thermal deformation of the fixing pieces 37a to 37d, the time until the lower leaf spring 7 is fixed can be shortened compared to the case where it is bonded and fixed, and the time required for the assembly work is shortened. be able to.

  After fixing the lower leaf spring 7, the end portion 5 a of the coil entangled with the projecting pieces 38 b and 38 d is soldered to the lower leaf spring 7. FIG. 5B shows the positional relationship between the protruding piece 38b (38d) and the lower leaf spring 7. As shown in FIG. 5B, the protruding piece 38b (38d) is provided in the concave portion 39a (39b) of the bowl-shaped portion 35. The base 381 of the protruding piece 38b is disposed in the recess 39a. For this reason, the base portion 381 is disposed closer to the winding portion of the coil 5 than the lower leaf spring 7 fixed to the flange portion 35. On the other hand, the extending portion 382 protrudes outward from the surface (flat portion 36) of the bowl-shaped portion 35. For this reason, the extending portion 382 is disposed at a position corresponding to the lower leaf spring 7 fixed to the flange portion 35. With respect to the protruding piece 38b (38d) arranged in this way, as described above, the end portion 5a (5b) of the coil 5 is the tip of the protruding piece 38b (38d) a predetermined number of times from the lower end portion of the extending portion 382. It is tied toward the club side.

  By the way, the end portion 5a of the coil 5 is preliminarily subjected to solder plating before entering such a binding work. For example, by immersing a wire portion corresponding to the end portion 5a in a solder bath, the resin coating of the wire portion is melted and peeled, and the wire portion is coated with solder and the end portion 5a is subjected to solder plating. In this solder plating operation, the length of the wire portion to be solder plated may vary, and the resin coating may remain on the portion joined to the lower leaf spring 7. When the resin coating remains, a situation where soldering with the lower leaf spring 7 cannot be performed properly may occur.

  In the lens driving device 1 according to the present embodiment, a portion of the coil 5 where resin coating may remain is avoided, and the end portion 5a of the coil 5 appropriately solder-plated is positioned at a position corresponding to the lower leaf spring 7. It is arranged. More specifically, the lower end portion of the extending portion 382 shown in FIG. 5B is disposed below the lower leaf spring 7, and the distal end portion of the extending portion 382 is located above the lower leaf spring 7 in the upper side shown in FIG. 5B. By disposing, the end portion 5a of the coil 5 appropriately plated with solder can be disposed at a position corresponding to the lower leaf spring 7. Then, as shown in FIG. 5B, the solder paste B is applied to the contact portion between the end portion 5a of the coil 5 entangled with the protruding piece 38b and the lower leaf spring 7, and this is appropriately heated by heating with a laser or the like. The end 5a of the coil 5 and the lower leaf spring 7 can be joined.

  After fixing the lower leaf spring 7 to the lens holder 3 in this way, the lens holder 3 is fixed to the base member 2. FIG. 6 is a perspective view of a state in which the lens holder 3 included in the lens driving device 1 according to the present embodiment is attached to the base member 2.

  As shown in FIG. 6, the lower leaf spring 7 is attached to the base member 2 such that the protruding pieces 22 a to 22 d provided on the base member 2 pass through the holes 71 a of the outer fixing portion 71. And the lower leaf | plate spring 7 is fixed to the base member 2 by applying heat to the protrusion pieces 22a-22d which penetrated the hole 71a, and making it deform | transform (heat caulking). Thereby, the lens holder 3 is fixed to the base member 2 via the lower leaf spring 7. A part of the lower leaf spring 7 is placed on the connection portion 111a exposed from the upper surface of the base member 2 and connected by soldering or the like.

  After fixing the lens holder 3 to the base member 2 in this way, the yoke 6 having the magnets 4a to 4d fixed to the inner walls of the four corners is used as a base so that the lens holder 3 is disposed inside the opening 61. Secure to member 2. Then, the upper leaf spring 8 is placed on the upper surface of the lens holder 3 and the yoke 6 so that the positioning pieces 34 a to 34 d of the lens holder 3 are accommodated by the notch 82 a, and the upper leaf spring 8 is mounted on the lens holder 3. Fix it. Further, the cover member 9 is fixed so that the fixing pin 102 is inserted into the holes 66 a to 66 d of the yoke 6 through the hole 81 a of the upper leaf spring 8. Thereby, the assembly operation of the lens driving device 1 is completed, and the lens driving device 1 in the state shown in FIGS. 7 and 8 is completed. FIG. 7 is a perspective view showing an appearance of the lens driving device 1 according to the present embodiment. FIG. 8 is a top sectional view of the lens driving device 1 according to the present embodiment.

  When fixing to the base member 2, the yoke 6 has the fixing pieces 62a to 62d overlapped on the fixing portions 101a to 101d of the metal plate 10 protruding from the four corners of the base member 2, as shown in FIG. State. The yoke 6 is fixed to the base member 2 by joining the fixing pieces 62a to 62d and the fixing portions 101a to 101d by laser welding or the like. The fixing pieces 62a to 62d are configured in a shape in which the center is recessed inward so as to be easily joined to the fixing portions 101a to 101d.

  In the assembled state, in the lens driving device 1, as shown in FIG. 7, the lens holder 3 is disposed inside the opening 91 of the cover member 9. The lens holder 3 is fixed to the base member 5 by the lower leaf spring 7, and is fixed to the yoke 6 by the upper leaf spring 8, and is held at the initial position by the urging force of the upper leaf spring 8 and the lower leaf spring 7. It is in the state. A lens body (not shown) is assembled by screwing into the lens holder 3 from above as shown in FIG. 3 and is configured to be movable integrally with the lens holder 3.

  Inside the lens driving device 1, as shown in FIG. 8, the lens holder 3 around which the coil 5 is wound around the holding pieces 31 a to 31 d is disposed so as to face the opening 21 of the base member 2. Yes. Out of the coil 5 held by the lens holder 3, hanging wall surfaces 63 a to 63 d of the yoke 6 are provided between the inner peripheral portion of the portion where the holding pieces 31 a to 31 d are not disposed and the outer peripheral surface of the lens holder 3. Has been placed. These hanging wall surfaces 63 a to 63 d are arranged to face the magnets 4 a to 4 d fixed to the inner wall surfaces at the four corners of the yoke 6 with the coil 5 interposed therebetween.

  Next, the operation of the lens driving device 1 according to the present embodiment will be described. FIG. 9 is a perspective view for explaining the operation of the lens driving device 1 according to the present embodiment. FIG. 9 shows a cross section corresponding to the central portion of the side of the base member 2 where the connection piece 111b is provided and the corner portion where the fixing portion 101c is disposed. FIG. 9 shows a state where the lens holder 3 is moved in the optical axis direction to the uppermost position.

  In the lens driving device 1, the magnets 4 a to 4 d arranged at the four corners, for example, reach the suspended wall surfaces 63 a to 63 c of the yoke 6 from the inner peripheral surface 43 of the magnets 4 a to 4 d via the coil 5. The magnetic field which returns to the outer peripheral surface of the magnets 4a-4d through the upper surface part and outer wall part of 6 is formed. When a current is passed through the coil 5 held on the outer peripheral surface of the lens holder 3, the current flowing through the coil 5 acts on the magnetic field generated from the magnets 4a to 4d, thereby moving the coil 5 in the vertical direction shown in FIG. Thrust is generated. Accordingly, the lens holder 3 moves in the vertical direction against the urging force of the lower leaf spring 7 and the upper leaf spring 8.

  In the lens driving device 1 according to the present embodiment, for example, this thrust is controlled by controlling the amount of current flowing through the coil 5 in accordance with a driving instruction from a control unit of a mobile phone or digital camera equipped with the device main body. Then, the coil 5 is moved up and down and positioned. As a result, the lens holder 3 that holds the coil 5 can be positioned, and the lens body assembled to the lens holder 3 can be positioned. When the supply of the current flowing through the coil 5 is stopped, the lens holder 3 returns to the initial position according to the urging force of the lower leaf spring 7 and the upper leaf spring 8.

  Thus, in the lens driving device 1 according to the present embodiment, the coil 5 is directly wound between the hook-shaped portion 35 provided in the lens holder 3 and the positioning pieces 32a to 32d, and the hook-shaped portion. Since the lower leaf spring 7 is fixed by the fixing pieces 37a to 37d provided on the lens 35, the coil 5 and the lower leaf spring 7 can be fixed to the lens holder 3 without using an adhesive. As a result, it is possible to assemble efficiently without causing any harmful effects associated with the use of. Further, since the fixing pieces 37a to 37d for fixing the lower leaf spring 7 are provided on the flat surface 36 constituting the lower surface of the bowl-shaped portion 35, the dimensions of the fixing pieces 37a to 37d can be configured to be somewhat large. The lower leaf spring 7 can be firmly fixed to the lens holder 3 as compared with the case where the lower leaf spring 7 is bonded and fixed to the lens holder 3 main body (for example, the lower end surface of the cylindrical portion constituting the lens holder 3). It becomes.

  In particular, in the lens driving device 1 according to the present embodiment, a collar portion 35 and a plurality of holding pieces 31a to 31d are provided on the outer periphery of the lens holder 3, and each of the holding pieces 31a to 31d has one of them. Positioning pieces 32a to 32d are provided in the part, and the coil 5 is wound between the flange 35 and the positioning pieces 32a to 32d. Thereby, a space can be formed between the outer peripheral portion of the lens holder 3 and the inner peripheral portion of the coil 5 in the portion where the holding pieces 31 a to 31 d are not provided. On the other hand, since the positioning pieces 32a to 32d are provided in a part of the holding pieces 31a to 31d, the positioning pieces 32a to 32d are not arranged in a portion corresponding to the space. For this reason, even if the hanging wall surfaces 63a to 63d (inner wall portions) provided in a part of the yoke 6 are inserted into the space, it can be efficiently performed without causing any harmful effects due to the use of the adhesive. It becomes possible to assemble.

  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 above-described embodiment, a case has been described in which a plurality of positioning pieces 32a to 32d are provided on the outer peripheral portion of the lens holder 3 so as to be spaced apart from the flange 35 by a certain distance in the optical axis direction. The configuration of the member that restricts the movement of the coil 5 in the optical axis direction is not limited to this, and can be changed as appropriate. For example, you may make it provide the other hook-shaped part arrange | positioned facing the hook-shaped part 35 at a fixed distance apart. Even in such a change, as in the above-described embodiment, the assembly can be efficiently performed without causing the adverse effects associated with the use of the adhesive. Moreover, when changing in this way, it is preferable to provide the opening part which the drooping wall surfaces 63a-63d of the yoke 6 can penetrate. In this case, as in the above embodiment, the hanging wall surfaces 63a to 63d (inner wall portions) provided on a part of the yoke 6 are located between the outer peripheral portion of the lens holder 3 and the inner peripheral portion of the coil 5. Even if it is the structure inserted in space, it becomes possible to assemble efficiently, without producing the trouble accompanying utilization of an adhesive agent.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Base member 21 Opening part 22a-22d Projection piece 23a-23d Reference surface 3 Lens holder 31a-31d Holding piece 32a-32d Positioning piece 33a-33d Projection piece 34a-34d Positioning piece 35 Gutter-like part 36 Flat part 37a-37d Fixed piece 38a-38d Projection piece 381 Base part 382 Extension part 39a, 39b Recession 4a-4d Magnet 41, 42 Side face part 43 Inner peripheral surface part 5 Coil 6 Yoke 61 Opening part 62a-62d Fixed piece 63a-63d Hanging Wall surface 64a to 64d Recessed portion 65a to 65d Abutting piece 66a to 66d Hole 7 Lower plate spring 71 Outer fixing portion 71a Hole 72 Inner fixing portion 72a Hole 73 Arm portion 8 Upper leaf spring 81 Outer fixing portion 81a Hole 82 Inner fixing portion 82a Cutting Notch 83 Arm 9 Cover member 91 Opening 92 Solid Fixed pins 10, 11 Metal plate materials 101a to 101d Fixed portion 111a Connection portion 111b Connection piece

Claims (12)

A lens holding unit that holds the lens body, a moving mechanism that includes a magnet, a coil, and a yoke and moves the lens holding unit along an optical axis direction; and an elastic member that elastically holds the lens holding unit. The yoke is a lens driving device formed in a box shape having a plurality of side portions ,
On the outer periphery of the lens holding means, a plurality of holding pieces having a flat portion facing the side surface portion of the yoke are provided, and a hook-like portion is provided on the end side in the optical axis direction. at a position a predetermined distance apart in the optical axis direction, positioning piece facing said flange portion across the flat portion of the holding piece is provided, Oite between the positioning piece and the flange portion, the holding The coil is wound directly around the lens holding means so as to follow the flat portion of the piece, and the flat portion of the coil held on the flat portion of the holding piece directly faces the side portion of the yoke. It is arranged Te lens driving device according to claim Rukoto. 2. The lens driving device according to claim 1, wherein the positioning piece is formed so as to protrude outward from the outer periphery of the lens holding means, and the tip of the positioning piece is located outside the coil. The lens driving device according to claim 1, wherein a tip portion of the positioning piece is formed in a straight line shape along a flat portion of the holding piece. The width dimension of the flat part of the coil in the direction orthogonal to the optical axis direction is formed larger than the width dimension of the flat part of the holding piece, and both ends of the flat part are outside the both ends of the flat part. The lens driving device according to claim 1, wherein the lens driving device is located at a position. The plurality of holding pieces are formed to protrude outward from the outer periphery of the lens holding means, and a portion located between the adjacent flat portions of the coil is separated from the outer peripheral surface of the lens holding means. The lens driving device according to any one of claims 1 to 4, wherein the lens driving device is provided. The yoke has an upper surface portion with an opening formed in the center, and an arcuate hanging wall surface is provided at a position corresponding to a plurality of corners of the yoke at the peripheral edge of the opening. 6. The lens driving device according to claim 5, wherein the hanging wall surface is disposed between a portion located between the adjacent flat portions of the coil and an outer peripheral surface of the lens holding means. . 7. The fixing device according to claim 1, further comprising: a fixing piece that is inserted into a hole formed in the elastic member and that fixes the elastic member on one surface of the flange-shaped portion. lens driving device crab according. The lens driving device according to claim 7 , wherein the elastic member is fixed to the lens holding unit by thermally deforming the fixing piece. 9. The lens driving device according to claim 1 , wherein a protruding piece on which an end of the coil is entangled is provided on one outer surface of the hook-shaped portion. The lens drive according to claim 9 , wherein the protruding piece is inserted into a hole formed in the elastic member, and an end portion of the coil entangled with the protruding piece is joined to the elastic member. apparatus. The projecting piece includes a base provided on the flange-like portion side, and an extending portion provided extending from the base and having a shape narrower than the base, and an end of the coil is the extension. The lens driving device according to claim 10 , wherein the lens driving device is entangled with the protruding portion. The protruding piece is provided so as to protrude from a concave portion formed by being recessed in the surface of the bowl-shaped portion, and the base portion is disposed in the concave portion, while the extending portion is formed from the surface of the bowl-shaped portion. also protrudes outwardly, the coil claims, characterized in that the end of the coil from the position of the base side in the extending portion is tied to be disposed on the distal end side of the extending portion Item 12. The lens driving device according to Item 11 .

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