JP2019003149A - Lens drive device, camera module using the same, and manufacturing method of the same - Google Patents

Abstract

To provide a lens drive device capable of accurately positioning and fixing an upper plate spring into a case, a camera module using the lens drive device, and a manufacturing method of the lens drive device.SOLUTION: A support member 50 and an upper plate spring 30 are inserted into a case 3. At both ends of a side facing portion 31a of the upper plate spring 30, projections 34 projecting from their outer edges are formed. The upper plate spring 30 is positioned in the case 3 in reference to the opposite portions of the projections 34 and the inner surface of a side wall portion 3d. Then, with an adhesive, the case 3 is fixed to the support member 50, and the support member 50 is fixed to the upper plate spring 30.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a lens driving device in which a lens holding member and a leaf spring that supports the lens holding member are housed in a case, a camera module using the lens driving device, and a method of manufacturing the lens driving device.

Patent Document 1 describes an invention related to a lens driving device.
The lens driving device includes a base member and a yoke that covers the base member. A spacer member is fixed inside the ceiling of the yoke, and an upper leaf spring is fixed to the lower surface of the spacer member. A pair of lower leaf springs is fixed to the base member. A lens holding member having a coil is housed inside the case, and the lens holding member is supported by an upper leaf spring and a lower leaf spring so as to be movable in the optical axis direction of the lens.

  A magnet is fixed inside the case, and the magnet faces the outside of the coil. The drive current is passed through the coil through a pair of lower leaf springs. The lens holding member is moved in the direction of the optical axis of the lens by the drive current flowing in the coil and the magnetic field from the magnet facing the coil, and this operation focuses the image on the image sensor.

Utility Model Registration No. 3182605

  This type of lens driving device is small in which one side of the yoke is about 10 mm or less. Therefore, the upper leaf spring is precisely manufactured by an etching process or the like, and is processed with extremely high dimensional accuracy such as an outer edge portion. On the other hand, since the yoke has a box shape and is manufactured by a pressing process using a metal plate made of a magnetic material, the dimensional accuracy of the yoke must be rough compared to the upper leaf spring. In particular, there is a limit to increasing the flatness of the side wall of the yoke. If the central part of the side wall is curved outward within the tolerance range, a deviation is likely to occur between the center of the upper leaf spring and the center of the yoke, and the central part of the side wall part is within the tolerance range. If it is curved inward, the upper leaf spring may not be mounted in the case.

  Further, in the structure in which the spacer member is fixed inside the ceiling portion of the yoke and the upper leaf spring is fixed to the spacer member as in the lens driving device described in Patent Document 1, the internal space of the yoke is narrow. It is also difficult to supply and bond an appropriate amount of adhesive between the yoke ceiling and the spacer member and between the spacer member and the upper leaf spring. In addition, if an adhesive is attached to the elastic arm portion of the upper leaf spring, the elastic coefficient of the upper leaf spring is affected, so that the spacer member and the upper leaf spring are not attached to the elastic arm portion. The work of bonding is also difficult.

  The present invention solves the above-described conventional problems, and provides a lens driving device capable of easily positioning and adhering a leaf spring inside a case, a camera module using the lens driving device, and a method of manufacturing the lens driving device. It is intended to provide.

The present invention provides a support base, a case covering the support base, a lens holding member on which at least a part is located inside the case and on which a lens body can be mounted, and the lens holding member of the lens body. A leaf spring that is movably supported in the direction of the optical axis, a coil mounted on the lens holding member, and a magnet that is provided in the case and faces the coil.
The leaf spring connects a fixed side support portion fixed to the inside of the case, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the lens driving device in which the elastic arm portion is integrally formed,
The fixed side support portion of the leaf spring has an outer edge portion along the inner surface of the case, and a plurality of protruding portions protruding from the outer edge portion toward the inner surface of the case are provided at intervals. It is characterized by this.

In the lens driving device of the present invention, for example, the case has a rectangular shape in plan view, four side wall portions, a square wall portion positioned at a corner portion, a ceiling portion, and an opening formed in the ceiling portion. And
The fixed side support portion of the leaf spring includes a side surface facing portion that faces the side wall portion, and a corner surface facing portion that faces the corner wall portion,
The protrusions facing the inner surface of the side wall portion are integrally formed in at least two places excluding the central portion of each side surface facing portion.

  In the lens driving device of the present invention, a support member facing the ceiling portion is provided inside the case, and the fixed-side support portion abuts against a spring fixing surface facing the support base side of the support member. The space between the case and the support member and the space between the support member and the fixed side support portion are fixed with an adhesive.

  In the lens driving device according to the present invention, a gap is formed between the outer edge portion of the fixed-side support portion and the inner surface of the case between the two protruding portions located on both sides of the angular surface facing portion. It is preferable that a part of the adhesive is present in the gap.

  In the lens driving device of the present invention, the spring fixing surface is provided on the support member so as to correspond to at least two places excluding the central portion of the side surface facing portion, and the spring fixing surface is provided. It is preferable that the side facing portion and the support member are separated from each other in a region that is not present.

  In the lens driving device according to the aspect of the invention, the elastic arm portion of the leaf spring extends from the side facing portion, and the elastic arm portion does not overlap the spring fixing surface, and the elastic arm portion of the side spring opposing the side of the side facing portion. It is preferable that the portion where the elastic arm portion extends is overlapped and bonded to the spring fixing surface.

In the lens driving device according to the aspect of the invention, the support member is located between the angular surface facing portion of the leaf spring and the elastic arm portion, and is located on a side farther from the ceiling portion than the leaf spring. A magnet contact part is formed,
The magnet may be configured to be in contact with the magnet contact portion and bonded to the inner surface of the case.
In this case, it is preferable that the magnet and the elastic arm portion face each other in a direction parallel to the optical axis in a state of being separated from each other.

In the lens driving device of the present invention, the support member includes a side support portion that faces the inner surface of the side wall portion, and a corner portion support portion that faces the inner surface of the corner wall portion, and the magnet The contact portion is formed on the corner support portion.
And it is preferable that the support protrusion which opposes the inner surface of the said side wall part is provided in at least two places except the center part of the said side part support part.

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

Furthermore, the present invention provides a support base, a case that covers the support base, a lens holding member that can be mounted at least partially inside the case and capable of mounting a lens body, and the lens holding member as the lens. A leaf spring that is movably supported in the optical axis direction of the body, a coil mounted on the lens holding member, and a magnet that is provided in the case and faces the coil,
The leaf spring connects a fixed side support portion fixed to the inside of the case, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the manufacturing method of the lens driving device in which the elastic arm portion is integrally formed,
The leaf spring is provided with a plurality of protruding portions protruding toward the inner surface of the case at an interval on the outer edge portion along the inner surface of the case of the fixed side support portion,
A support member and the leaf spring are arranged inside the case, and at least the protruding portion is formed by bringing the fixed-side support portion into contact with a spring fixing surface facing the support base side of the support member. The adhesive is supplied between the outer edge portion of the fixed-side support portion and the inner surface of the case in a region that is not, and between the case and the support member, and between the support member and the fixed-side support portion. Between the two is fixed with an adhesive.

In the method for manufacturing a lens driving device according to the present invention, the case has a rectangular shape in plan view, and is formed on four side wall portions, a corner wall portion located at a corner portion, a ceiling portion, and the ceiling portion. An opening,
The fixed side support portion of the leaf spring includes a side surface facing portion that faces the side wall portion, and a corner surface facing portion that faces the corner wall portion,
The protrusions facing the inner surface of the side wall portion are integrally formed in at least two places excluding the central portion of each side surface facing portion,
The support member is fixed to the inside of the ceiling portion.

  The method for manufacturing a lens driving device according to the present invention is provided between the two protruding portions located on both sides of the angular surface facing portion, and between the outer edge portion of the fixed-side support portion and the inner surface of the case. A gap is formed, and a part of the adhesive is present in the gap.

  In the method of manufacturing a lens driving device according to the present invention, the spring fixing surface is provided on the support member so as to correspond to at least two places excluding the central portion of the side surface facing portion, and the spring fixing surface is It is preferable that the side surface facing portion and the support member are separated from each other in a region that is not provided.

  In the method for manufacturing a lens driving device according to the present invention, the elastic arm portion of the leaf spring is formed to extend from the side facing portion, and the elastic arm portion is not overlapped with the spring fixing surface. It is preferable that a portion of the side facing portion where the elastic arm portion extends is overlapped and bonded to the spring fixing surface.

In the method for manufacturing a lens driving device according to the present invention, the support member is located between the angular face-facing portion of the leaf spring and the elastic arm portion, and is on the side farther from the ceiling portion than the leaf spring. A magnet contact portion located at
It is preferable that the magnet is brought into contact with the magnet contact portion to bond the magnet and the inner surface of the case.

  Furthermore, the manufacturing method of the lens driving device of the present invention includes an adhesive that fixes between the case and the support member and between the support member and the fixed-side support portion, the magnet, and the inner surface of the case. It is preferable to cure the adhesive for fixing the same in the same heating step.

  In the method for manufacturing a lens driving device of the present invention, the magnet and the elastic arm can be opposed to each other in a direction parallel to the optical axis in a state of being separated from each other.

In the method for manufacturing a lens driving device according to the present invention, the support member includes a side support portion that faces the inner surface of the side wall portion, and a corner support portion that faces the inner surface of the corner wall portion. The magnet contact portion is formed on the corner support portion.
It is preferable that support projections facing the inner surface of the side wall portion are provided on the side support portion in at least two places excluding the central portion of the side support portion.

  In the lens driving device according to the present invention, a plurality of protruding portions are formed at intervals on the outer edge portion of the fixed side support portion of the leaf spring, so that the plate is formed in the case by contact or proximity between the protruding portion and the inner surface of the case. The spring can be positioned and fixed. For example, the center portion of the side wall portion of the case is formed by forming a side facing portion and a corner facing portion on the leaf spring, and forming protrusions at intervals in at least two places excluding the center portion of the side facing portion. Even if there is a dimensional tolerance in the flatness, the case and the leaf spring can be positioned on the basis of the contact portion or the proximity portion between the protruding portion and the inner surface located outside the central portion of the side wall portion. .

  In the method for manufacturing a lens driving device according to the present invention, an adhesive is supplied to a gap between the outer edge portion of the fixed side support portion and the inner surface of the case in a region where the protruding portion of the fixed side support portion of the leaf spring is not formed. Thus, an appropriate amount of adhesive can be supplied and bonded between the case and the support member and between the support member and the fixed side support portion of the leaf spring.

The perspective view which shows the external appearance of the lens drive device of embodiment of this invention, FIG. 2 is an exploded perspective view showing components of the lens driving device shown in FIG. FIG. 2 is an exploded perspective view showing an assembly of a support base, a lower leaf spring, and a lens holding member provided at a lower portion of the lens driving device shown in FIG. FIG. 3 is a bottom view of the assembly in which the components shown in FIG. 3 are assembled, as viewed from below with the support base removed; Sectional drawing which cut | disconnected the lens drive device shown in FIG. Sectional drawing which looked at what cut | disconnected the lens drive device by the VI-VI line of FIG. Sectional drawing which removed the lens holding member and the magnet from the sectional view shown in FIG. The enlarged view which expands the illustration upper left part of FIG. The disassembled perspective view which shows the component of FIG.

  1, 2, and 5 show the overall structure of the lens driving device 1 according to the embodiment of the present invention. FIG. 3 shows a support base, a lower leaf spring, a lens holding member, The assembly 70 is shown.

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

  A Z1-Z2 direction shown in each figure is a vertical direction, which is a direction (optical axis direction) parallel to the optical axis O of the lens body. A lens driving device 1 whose entire structure is shown in FIGS. 1, 2 and 5 is mounted on a portable electronic device such as a cellular phone. An imaging element such as a CCD is disposed on the Z2 side of the lens driving device 1. The lens driving device 1, the lens body, and the image sensor are combined to form a camera module. In the camera module, when the lens holding member 10 and the lens body mounted on the lens holding member 10 move in the Z1-Z2 direction, automatic focusing of an image formed on the image sensor is performed.

  As shown in FIGS. 1, 2, and 3, the lens driving device 1 is provided with a support base 40 and a case 3. The support base 40 and the case 3 are combined to form a housing having a storage space inside. Lower plate springs 20A and 20B are provided between the lower part of the lens holding member 10 housed in the internal space and the support base 40, and the upper plate spring 30 is provided between the upper part of the lens holding member 10 and the inside of the case 3. Is provided.

  As shown in FIGS. 1 and 2, the case 3 is formed of a magnetic steel plate (steel plate made of ordinary steel) or the like and functions as a magnetic yoke. Case 3 has a ceiling portion 3a. An opening 3 b is formed in the ceiling 3 a of the case 3. The opening 3b of the case 3 faces the center hole 13a of the lens holding member 10 from above.

  The case 3 has a quadrangular shape (rectangular shape) when viewed from the optical axis direction, and has four side wall portions 3d as outer wall portions and the side wall portions 3d located at the corners of the case 3 as the outer wall portions. Are provided with a square wall portion 3e. The planar shape of the opening 3b formed in the ceiling portion 3a is a quadrangular shape, and the opposing yoke portion 3c bent in the Z2 direction is integrally formed from the four corners of the inner edge of the opening 3b. ing. As shown in FIG. 9, the opposing yoke portion 3c is opposed to the inner surface of each square wall portion 3e from the inside of the case.

  As shown in FIGS. 2 and 5, a support member (spring fixing member) 50 is provided inside the case 3 on the inner side (inner surface side) which is the Z2 side of the ceiling portion 3a. The support member 50 is made of a nonmagnetic material such as a synthetic resin material. The support member 50 has a rectangular frame shape, and includes four side support portions 51 and corner support portions 52 positioned at four corner portions. The side portion support portion 51 faces the inner surface of the side wall portion 3 d of the case 3, and the corner portion support portion 52 faces the inner surface of the corner wall portion 3 e of the case 3. Case contact portions 53 are formed in each of the four corner support portions 52. As shown in FIGS. 5 and 9 (FIG. 9 is shown upside down), the case contact portion 53 is provided in the corner support portion 52, or the corner support portion 52 and the side portion support portion 51, It is provided in the boundary part. The case contact portion 53 is formed to protrude in the Z1 direction from the upper surface 51a of the side support portion 51 of the support member 50.

  A support protrusion 54 that protrudes toward the side wall 3 d of the case 3 is formed on each side support 51 of the support member 50. As shown in FIGS. 7 and 8, the support protrusion 54 is formed to protrude from the outer side portion 51 c of the side support portion 51 of the support member 50 toward the inner surface of the side wall portion 3 d. It is preferable that the support protrusions 54 are provided in at least two locations of the respective side support portions 51 and are not provided in the central portion of the side support portions 51. In the embodiment, the support protrusions 54 are provided only at both end portions of the respective side support portions 51, and are not provided at the center portion of the side support portions 51.

  As shown in FIGS. 5 and 9, a spring fixing surface 55 is provided on the lower surface 51 b of the side support portion 51 formed on the support member 50 facing the Z <b> 2 direction. The spring fixing surface 55 is formed so as to protrude to the Z2 side, which is further below the lower surface 51b of the side support portion 51, and the surface thereof is a flat surface parallel to the XY plane. The spring fixing surfaces 55 are preferably provided at at least two locations on the lower surface 51 b of each side support 51 and not provided at the center of the side support 51. In the embodiment, the spring fixing surfaces 55 are provided only at both end portions of the side support portion 51, and are not provided at the center portion of the side support portion 51.

  The spring fixing surface 55 is a part that is bonded and fixed in contact with a side facing portion 31a of the fixing side support portion 31 formed in the upper leaf spring 30 described later. The spring fixing surface 55 is formed to protrude downward from the side support portion 51 of the support member 50 so as to correspond to at least two places excluding the central portion of the side facing portion 31a. For this reason, even when the center part of the support member 50 is warped, the side facing part 31 a of the upper leaf spring 30 can be appropriately received by the spring fixing surface 55.

  As shown in FIGS. 7 and 9, support ridges 56 that protrude (project) downward are formed integrally with the four corner support portions 52 of the support member 50. Yes. The support raised portion 56 has a trapezoidal shape when viewed from the Z2 side. Magnet contact portions 57 projecting in the Z2 direction are formed at two locations on the surface of the support ridge 56 facing downward. The surface of the magnet contact portion 57 facing the Z2 direction is a magnet contact surface parallel to the XY plane.

  As shown in FIGS. 2, 5, and 7, the upper leaf spring 30 is fixed to the lower surface of the support member 50 facing the Z2 direction. The upper leaf spring 30 includes a rectangular frame-shaped fixed-side support portion 31, a pair of movable-side support portions 32 positioned on the Y1 side and the Y2 side inside thereof, and the fixed-side support portion 31 and the movable-side support. Elastic arm portions 33 that connect the portions 32 at two locations are integrally formed of a leaf spring metal material. The upper leaf spring 30 is formed by etching. The upper leaf spring 30 is disposed such that the thickness direction is the optical axis direction when the lens driving device 1 is assembled.

  The fixed side support portion 31 of the upper leaf spring 30 is continuously provided with a strip-shaped side facing portion 31a extending linearly in the X direction and the Y direction, and a corner facing portion 31b located at four corners. It is integrally formed. The side facing portion 31 a means a portion that extends linearly in the X direction and the Y direction and that faces the inner surface of the side wall portion 3 d of the case 3. The corner facing portion 31 b means a portion facing the inner surface of the corner wall portion 3 e of the case 3. The side wall portion 3d of the case 3 means a flat portion of the lateral outer wall portion of the case 3, and the square wall portion 3e is located between the adjacent side wall portions 3d. It means a portion where the lateral outer wall has a curved shape.

  As shown in FIG. 7, FIG. 8, and FIG. 9, protruding portions 34 that protrude from the outer edge portion 31 c of the fixed side support portion 31 toward the inner surface of the side wall portion 3 d of the case 3 at a plurality of locations on the fixed side support portion 31. Is formed. The protrusions 34 are preferably formed in at least two locations of the respective side facing portions 31a, and the protrusions 34 are preferably not formed at the center of each of the side facing portions 31a. In the embodiment, the protruding portions 34 are formed only at both end portions of the side facing portion 31a. In addition, the protrusion 34 is not provided between the pair of protrusions 34, that is, in the central portion of the side facing portion 31 a. As shown in FIG. 8, the protrusions 34 are not provided in the region W between the protrusions 34 located at two positions on both sides of the angular face facing portion 31 b of the fixed side support portion 31. Then, a gap δa is formed between the outer edge portion of the upper leaf spring 30 and the inner surface of the case 3.

  The elastic arm portion 33 is formed in a thin curved shape, that is, a meandering shape. The two elastic arm portions 33 located on the Y1 side protrude from the side facing portion 31a formed on the Y1 side in the fixed side support portion 31 toward the central portion that is the inner side of the upper leaf spring 30 as a whole, The two elastic arm portions 33 located on the side protrude from the side facing portion 31a formed on the Y2 side in the fixed side support portion 31 toward the central portion as a whole. A base portion of each elastic arm portion 33, that is, a boundary portion between the side facing portion 31a and the elastic arm portion 33 is indicated by reference numeral 33a.

  As shown in FIGS. 7 and 8, the support member 50 is installed on the inner surface of the ceiling portion 3 a of the case 3, and the upper leaf spring 30 is installed on the Z <b> 2 side that is the lower surface side of the support member 50. In the support member 50, the case contact portion 53 provided on the Z1 side is abutted against the inner surface of the ceiling portion 3 a of the case 3, and the upper leaf spring 30 has the upper surface of the side facing portion 31 a of the fixed-side support portion 31. , Butted against the spring fixing surface 55 of the support member 50.

  As shown in FIGS. 7 and 8, a trapezoidal support raised portion 56 formed in the support member 50 is inserted between the angular face facing portion 31 b of the upper leaf spring 30 and the elastic arm portion 33. The support bulge portion 56 enters between the angular surface facing portion 31b and the elastic arm portion 33, whereby the support member 50 and the upper leaf spring 30 are positioned with respect to each other.

  By abutting the case contact portion 53 against the inner surface of the ceiling portion 3a, the support member 50 can be positioned in the case 3 toward the optical axis O direction. Since the case 3 is manufactured by press working, the dimensional accuracy at the corner of the ceiling 3a and in the vicinity thereof is relatively high. The case contact part 53 is formed in the corner | angular part support part 52 of the support member 50, and the case contact part 53 is abutted on the corner | angular part of the rectangular ceiling part 3a. Therefore, the support member 50 can be positioned with high accuracy in the case 3 toward the optical axis direction. Further, the flatness of all the spring fixing surfaces 55 formed on the support member 50 can be maintained high, and the upper leaf spring 30 abutted against the spring fixing surface 55 also maintains a high degree of perpendicularity to the optical axis O. Can be installed.

  On the other hand, as shown in FIG. 5, except for the corner portion of the case 3, a gap δ1 is formed between the upper surface of the support member 50, that is, the upper surface 51a of the side support portion 51 and the ceiling portion 3a. Therefore, the support member 50 can be positioned in the optical axis direction within the case 3 without being affected by the flatness tolerance of the ceiling portion 3a.

  As shown in FIGS. 7 and 8, when the support member 50 and the upper leaf spring 30 are installed inside the ceiling portion 3 a of the case 3, the support protrusion provided on the side support portion 51 of the support member 50. 54 faces the inner surface of the side wall 3d of the case 3. Further, the protrusion 34 protruding outward from the side facing portion 31 a of the upper leaf spring 30 also faces the inner surface of the side wall 3 d of the case 3. The support member 50 can be positioned inside the case 3 by causing the support protrusion 54 formed on the side support portion 51 of the support member 50 to face the inner surface of the side wall 3 d of the case 3. Further, the center of the upper leaf spring 30 in the plan view can coincide with the center of the case 3 by making the protrusion 34 projecting from the side facing portion 31a of the upper leaf spring 30 face the inner surface of the side wall portion 3d. Can be positioned.

  As shown in FIG. 8, the gap (i) between the protrusion 34 formed on the upper leaf spring 30 and the inner surface of the side wall 3 d of the case 3 is separated from the support protrusion 54 formed on the support member 50 and the side surface. It is narrower than the gap (ii) with the inner surface of the wall 3d. Therefore, in the state where the support member 50 and the upper leaf spring 30 are combined by the support ridge 56, the projecting portion 34 and the side wall portion 3d face each other or contact each other, so that the center of the upper leaf spring 30 is obtained. The upper leaf spring 30 is positioned so that the displacement between the center of the case 3 and the center of the ceiling 3a of the case 3 can be minimized. The support member 50 is also positioned so as to follow this.

  The protrusions 34 provided on the upper leaf spring 30 are provided at both ends of the side facing portion 31a of the upper leaf spring 30, and the protrusion 34 is not provided at the center of the side facing portion 31a. Further, the support protrusions 54 provided on the support member 50 are also provided at both ends of the side support part 51, and the support protrusions 54 are not provided at the center part of the side support part 51. Therefore, as shown in FIG. 8, a gap δ <b> 2 is formed between the outer edge portion 31 c of the side facing portion 31 a of the upper leaf spring 30 and the inner surface of the side wall portion 3 d in the portion where the protruding portion 34 does not exist. Yes. Further, in the portion where the support protrusion 54 does not exist, a gap δ3 is formed between the outer side portion 51c of the side portion support portion 51 of the support member 50 and the inner surface of the side wall portion 3d.

  In the side facing portion 31a of the upper leaf spring 30, the gap δ2 is formed at least in the central portion thereof, and in the side portion supporting portion 51 of the support member 50, the δ3 is formed at least in the central portion. In the press working for forming the case 3, the dimensional accuracy of both end portions of the square wall portion 3e and the side wall portion 3d located in the vicinity thereof can be made relatively high, whereas the central portion of the side wall portion 3d has a relatively large tolerance. It is difficult to achieve flatness. On the other hand, the upper leaf spring 30 is formed by etching, and the support member 50 is injection-molded with a synthetic resin material. Both of the two members are formed with a very small dimensional tolerance and high accuracy. Therefore, the protrusion 34 and the support protrusion 54 are opposed or brought into contact with positions close to the corner wall 3e of the case 3 (both ends of the side wall 3d), and the central portion of the side facing portion 31a and the side wall 3d. And the gap δ3 is formed between the central portion of the side support portion 51 and the side wall portion 3d, so that the flatness tolerance at the central portion of the side wall portion 3d is increased or decreased. Regardless, the upper leaf spring 30 and the support member 50 can be positioned with high accuracy inside the case 3.

  The inner surface of the ceiling portion 3a of the case 3 and the support member 50 are fixed with an adhesive, and the support member 50 and the upper leaf spring 30 are also fixed with an adhesive. Accordingly, the upper leaf spring 30 is fixed inside the case 3 via at least the support member 50. As shown in FIG. 9, in a state W between the protrusions 34 located at two locations on both sides of the corner facing portion 31b in a state where the ceiling portion 3a is directed downward (where the Z1 direction is directed downward). The thermosetting adhesive having fluidity is supplied to the surface of the upper leaf spring 30 facing the Z2 side of the stationary support portion 31. Preferably, as shown in FIG. 8, at both ends of the side facing portion 31a (outside the protruding portion 34) of the fixed side support portion 31, or at the boundary between the side facing portion 31a and the corner facing portion 31b, Pa An adhesive is applied to the application area shown. The application area Pa is set at a position close to the spring fixing surface 55 provided on the support member 50, and more preferably, an area overlapping with the support protrusion 54 protruding to the side of the support member 50. The adhesive is applied so that a part thereof is in contact with the inner surface of the case 3.

  In the region W, the adhesive applied to the application region Pa enters the gap δa between the outer edge portion of the upper leaf spring 30 and the inner surface of the case 3, and the adhesive enters between the inner surface of the case 3 and the support member 50. . Further, the adhesive is received by the support protrusion 54 formed on the support member 50 and penetrates between the spring fixing surface 55 of the support member 50 and the side facing portion 31a of the upper leaf spring 30 by capillary action. . The adhesive applied to the application region Pa is present between the inner surface of the case 3 and the support member 50, between the spring fixing surface 55 and the side facing portion 31a, and further within the gap δa. The adhesive is heated in the same heating process as fixing the magnet in the case 3 later, and the adhesive is thermoset.

  As shown in FIG. 8, in the upper leaf spring 30, the elastic arm portion 33 extends from the side facing portion 31 a of the fixed side support portion 31. In the portion where the elastic arm portion 33 extends from the side facing portion 31a, that is, the base of the elastic arm portion 33 or the portion where the boundary portion 33a between the side facing portion 31a and the elastic arm portion 33 is located, the side facing portion 31a. Is fixed to the spring fixing surface 55 with an adhesive. In FIG. 8, the portion fixed by the adhesive is indicated by broken-line hatching. Since the side facing portion 31a is bonded and fixed to the spring fixing surface 55 at the base of the elastic arm portion 33 or the boundary portion 33a between the side facing portion 31a and the elastic arm portion 33, the elastic arm portion 33 is The boundary portion 33a can be deformed as a fulcrum, and problems such as torsional deformation in the side facing portion 31a due to elastic deformation of the elastic arm portion 33 do not occur.

  Moreover, since the elastic arm portion 33 is not overlapped with the spring fixing surface 55 over almost the entire length, the adhesive between the spring fixing surface 55 and the side facing portion 31a is difficult to adhere to the elastic arm portion 33, The problem that the elastic coefficient of the elastic arm portion 33 fluctuates due to adhesion of the adhesive does not occur.

  As shown in FIGS. 2 and 6, the lens driving device 1 is provided with four magnets M. The four magnets M are formed independently. Each magnet M has an outer surface Ma directed outward in the radial direction around the optical axis O and a magnetized surface Mg facing the optical axis O. Between the outer side surface Ma and the magnetized surface Mg, an adhesive surface Mb that is inclined and opposed to each other is formed. Each magnet M has a flat upper surface Mc facing the Z1 direction. Each magnet M is magnetized such that the magnetized surface Mg and the outer surface Ma have different polarities. Further, the magnetized surfaces Mg of all the magnets M are magnetized so as to have the same polarity.

  Each of the four magnets M is disposed inside the case 3 and inside the square wall portion 3e. As shown in FIG. 9, a thermosetting adhesive having fluidity is applied to the application region Pb on the inner surface of the side wall portion 3d located on both sides of the case 3 with the square wall portion 3e interposed therebetween, and the magnet M The adhesion surface Mb is magnetically attracted to the inner surface of the side wall portion 3d facing at an angle of 90 degrees. With the adhesive interposed between the magnet M and the case 3, each magnet M is moved in the Z1 direction, and the upper surface Mc facing the Z1 direction is formed on the corner support portion 52 of the support member 50. The magnet is brought into contact with the magnet contact portion 57. As a result, each magnet M is positioned so as to be fixed at the same position in the direction of the optical axis O in a state where the magnetized surface Mg is directed to the optical axis O.

  With the support member 50, the upper leaf spring 30, and the magnet M incorporated in the case 3, the process proceeds to the heating step. 8 is applied between the inner surface of the case 3 and the support member 50, is interposed between the spring fixing surface 55 and the side facing portion 31a, and is further interposed in the gap δa. 9 and the adhesive applied between the inner surface of the case 3 and the magnet M are simultaneously cured in the same heating process.

  As shown in FIGS. 5 and 6, since at least a part of the elastic arm portion 33 of the upper leaf spring 30 overlaps the upper surface Mc of the magnet M, the space inside the corner portion of the case 3 can be used effectively. It becomes like this. Moreover, since the magnet contact portion 57 provided on the corner support portion 52 of the support member 50 is located on the Z2 side with respect to the elastic arm portion 33 of the upper leaf spring 30, at least a part of the elastic arm portion 33 is provided. Even when the upper surface Mc of the magnet M overlaps, it is possible to avoid contact between the elastic arm 33 and the magnet M during the deformation operation of the elastic arm 33 in the Z direction. That is, at least a part of the magnet M and the elastic arm portion 33 are opposed to each other in a direction (Z1-Z2 direction) parallel to the optical axis O in a state of being separated from each other.

  After the support member 50, the upper leaf spring 30 and the magnet M are assembled in the case 3, the assembly 70 shown in FIG. 2 is assembled in the case 3. An exploded perspective view of the assembly 70 is shown in FIG.

  As shown in FIG. 3, a pair of lower leaf springs 20A and 20B separated from each other are provided between the support base 40 and the lens holding member 10 located thereon. The lower leaf spring located on the Y1 side is denoted by reference numeral 20A, and the lower leaf spring located on the Y2 side is denoted by reference numeral 20B. Each of the lower leaf springs 20A and 20B is a plate in which the fixed side support portion 21, the movable side support portion 22, and the elastic arm portion 23 that connects the fixed side support portion 21 and the movable side support portion 22 are conductive. It is integrally formed of a spring metal material. For example, the lower leaf springs 20A and 20B are formed of a springy stainless steel plate or phosphor bronze plate. The lower leaf springs 20A and 20B are formed by etching. Similarly to the upper leaf spring 30, the lower leaf springs 20A and 20B are arranged such that the thickness direction is the optical axis direction when the lens driving device 1 is assembled.

  As shown in FIG. 3, an attachment portion 21a located on the X2 side and an attachment portion 21b located on the X1 side are formed on the fixed side support portion 21 of the lower leaf spring 20A located on the Y1 side. The fixed side support portion 21 of the lower leaf spring 20B located on the Y2 side is also formed with an attachment portion 21a located on the X2 side and an attachment portion 21b located on the X1 side. The lower leaf springs 20A and 20B each have a mounting hole 24a formed in the mounting portion 21a located on the X2 side, and a mounting hole 24b formed in the mounting portion 21b located on the X1 side.

  As shown in FIGS. 2 and 3, the conductive plate 25A is overlaid on the upper side (Z1 side) of the X2 side mounting portion 21a of the lower leaf spring 20A located on the Y1 side, and the lower leaf spring 20B located on the Y2 side. The conductive plate 25B is superimposed on the upper side (Z1 side) of the attachment portion 21a on the X2 side. The conductive plates 25A and 25B are formed of a conductive metal plate, and are formed of, for example, a rolled steel plate whose surface is gold-plated, brass or another copper alloy plate. The conductive plates 25A and 25B have a support plate portion 26 parallel to the XY plane, and a connection terminal 27 bent from the support plate portion 26 to the lower side Z2. A hole 28 is formed in the support plate portion 26.

  With the mounting portion 21a of the lower leaf spring 20A and the support plate portion 26 of the conductive plate 25A positioned and overlapped, the mounting portion 21a and the support plate portion 26 are welded. This welding is performed by laser spot welding. The attachment portion 21a of the lower leaf spring 20B on the Y2 side and the support plate portion 26 of the conductive plate 25B are also welded in the same manner.

  As shown in FIG. 3, the support base 40 has a quadrangular planar shape and is formed of a synthetic resin material that is a nonmagnetic material. On the four corners of the support base 40, spring fixing surfaces 41A and 41B are formed. Two spring fixing surfaces located on the X2 side are denoted by reference numeral 41A, and two spring fixing surfaces located on the X1 side are denoted by reference numeral 41B. Positioning protrusions 42a are integrally formed on the two spring fixing surfaces 41A located on the X2 side, and positioning protrusions 42b are integrally formed on the two spring fixing surfaces 41B located on the X1 side. The positioning protrusions 42a and 42b protrude in the Z1 direction. The positioning protrusions 42a and the positioning protrusions 42b are cylindrical bodies each having a constant radius.

  As shown in FIG. 3, the support base 40 has a through hole 43 at a position adjacent to the spring fixing surface 41A formed on the X2 side. The through hole 43 is formed between the side 40c facing the X2 side of the support base 40 and each spring fixing surface 41A. The through hole 43 is formed through the support base 40 in the vertical direction (Z1-Z2 direction).

  In the state where the support plate portion 26 of each conductive plate 25A, 25B is overlapped and welded to the X2 side attachment portion 21a of the lower leaf springs 20A, 20B, the attachment holes 24a formed in the respective attachment portions 21a, respectively, The positioning projections 42a provided on the two spring fixing surfaces 41A of the support base 40 are inserted into the hole portions 28 formed in the support plate portion 26, so that the respective attachment portions 21a and the support plate portion 26 are inserted. Is positioned over the spring fixing surface 41A. Further, positioning protrusions 42b provided on the two spring fixing surfaces 41B are inserted into the respective mounting holes 24b formed in the X1 side mounting portions 21b of the lower leaf springs 20A and 20B, and the respective mounting portions are mounted. 21b is installed and positioned on the spring fixing surface 41B.

  Adhesive is applied to the positioning protrusions 42a and 42b provided on the support base 40, and the mounting portions 21a of the support base 40 and the lower leaf springs 20A and 20B are obtained by thermal curing or UV curing of the adhesive. , 21b are bonded and fixed. The attachment portions 21a of the lower leaf springs 20A and 20B and the conductive plates 25A and 25B are also bonded to each other. The tip portions of the four positioning projections 42a and 42b are hot-pressed to form caulking deformation portions at the tip portions of the positioning projections 42a and 42b, and the lower leaf springs 20A and 20B on the support base 40. The conductive plates 25A and 25B may be fixed by caulking.

  When the conductive plates 25A and 25B are fixed on the support base 40, the connection terminals 27 integral with the conductive plates 25A and 25B are inserted into the through holes 43 formed in the support base 40, and connected. The tip of the terminal 27 on the Z2 side is exposed further below the lower surface of the support base 40. At this time, by filling the inside of the through-hole 43 with an adhesive, the conductive plates 25A and 25B can be firmly fixed to the support base 40, and the through-hole 43 is closed with an adhesive and supported. It becomes easy to prevent liquid or the like from entering the inside of the case 3 from the lower side of the base 40 through the through hole 43.

  As shown in FIG. 3, the support base 40 has an opening 44 at the center. Further, stopper portions 45a and 45b are integrally formed on the upper surface of the support base 40 facing the Z1 direction. The stopper portion 45a is located in the space 29 between the fixed side support portion 21 and the movable side support portion 22 of the lower leaf springs 20A and 20B. As shown in FIG. 5, the upper surface of the stopper portion 45a is the lower plate. The springs 20A and 20B coincide with each other so as to be substantially flush with the upper surface of the fixed-side support portion 21. The stopper portion 45b is located between the two lower leaf springs 20A and 20B, and the upper surface of the stopper portion 45b is also located substantially in the same plane as the upper surface of the fixed side support portion 21 of the lower leaf springs 20A and 20B. Yes.

  As shown in FIG. 3, attachment holes 22a are formed in the movable side support portions 22 of the lower leaf springs 20A and 20B on the X1 side and the X2 side, respectively. As shown in the bottom view of FIG. 4, on the lower surface of the lens holding member 10 facing in the Z2 direction, spring fixing surfaces 10b are provided on the X1 side and the X2 side. In each spring fixing surface 10b, a pair of protrusions 10c protruding in the Z2 direction are integrally formed on the Y1 side, and a pair of protrusions 10d protruding in the Z2 direction are integrally formed on the Y2 side. The mounting holes 22a formed at both ends of the movable side support portion 22 of the lower leaf spring 20A on the Y1 side are fitted to the protrusions 10c, and the protrusions 10c are heat caulked to move the movable side of the lower leaf spring 20A. The support portion 22 is fixed to the two spring fixing surfaces 10 b on the lower surface of the lens holding member 10. Similarly, the mounting holes 22a formed at both ends of the lower plate spring 20B on the Y2 side are fitted into the respective projections 10d and heat caulked so that the movable side support portion 22 of the lower plate spring 20B has two. It is fixed to the spring fixing surface 10b of the place.

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

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

  As shown in the bottom view of FIG. 4, projections 19a and 19b are integrally formed at two locations on the bottom surface of the lens holding member 10 facing the Z2 direction. The protrusions 19a and 19b protrude in the Z2 direction. The protrusion 19a located on the Y1 side is a winding protrusion for fixing the winding start end 61a of the conducting wire forming the coil 60, and the protrusion 19b located on the Y2 side is a winding protrusion for fixing the winding end 61b of the conducting wire. The conducting wire for forming the coil 60 is a coated conducting wire, and has a copper wire that is a conductive metal wire and an insulating coating layer that covers the copper wire. The covering layer has a two-layer structure of an insulating layer such as a polyurethane resin covering the copper wire and a fusion layer such as a polyamide resin on the surface thereof.

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

  As shown in FIG. 4, when the movable side support portion 22 of the lower leaf springs 20A and 20B is fixed to the spring fixing surfaces 10b and 10b on the lower surface of the lens holding member 10, it is wound around the protrusion 19a on the Y1 side. The winding start end 61a of the conducting wire is adjacent to the movable support 22 of the lower leaf spring 20A on the Y1 side, and the winding start 61a and the movable support 22 are soldered. The winding end 61b of the conducting wire wound around the Y2 side protrusion 19b and the movable side support portion 22 of the Y2 side lower leaf spring 20B are also soldered in a state adjacent to each other. As a result, one lower leaf spring 20A is conducted to the winding start end 61a of the conductive wire, and the other lower leaf spring 20B is conducted to the winding end 61b.

  As shown in FIG. 3, the conductive plate 25A is overlapped and joined to the attachment portion 21a of the lower leaf spring 20A on the Y1 side, and the conductive plate 25B is overlapped and joined to the attachment portion 21a of the lower leaf spring 20B on the Y2 side. Therefore, the connection terminal 27 of the conductive plate 25A is electrically connected to the winding start end 61a of the coil 60 via the lower plate spring 20A on the Y1 side, and the connection terminal 27 of the conductive plate 25B is connected to the lower plate spring 20B on the Y2 side. Through. The coil 60 is electrically connected to the winding end 61b.

  As shown in FIGS. 2 and 3, a spring fixing surface 10 a is provided on the upper surface of the cylindrical portion 13 of the lens holding member 10 facing the Z1 direction. After the support member 50, the upper leaf spring 30, and the magnet M are fixed inside the case 3, the lens holding member 10, the lower leaf springs 20A and 20B, and the support base 40 around which the coil 60 is wound are assembled. The assembly 70 is inserted into the case 3 from below. The spring fixing surface 10a of the lens holding member 10 is abutted on the lower side of the movable side support portion 32 of the upper leaf spring 30 inside the case 3, and the spring fixing surface 10a and the movable side support portion 32 are made of an adhesive. Fixed. Further, the support base 40 and the case 3 are also fixed to each other.

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

  As shown in FIG. 3, the elastic arm portions 23 provided in the lower leaf springs 20A and 20B are formed in a thin curved shape, that is, a meandering shape, and are provided in the upper leaf spring 30 as shown in FIG. The elastic arm portion 33 is also formed into a thin curved shape, that is, a meandering shape. The lower end of the lens holding member 10 and the support base 40 are connected via lower leaf springs 20A and 20B, the upper end of the cylindrical portion 13 of the lens holding member 10, and the support member 50 fixed to the case 3. Are connected via the upper leaf spring 30. Due to the elastic supporting force of both the elastic arm portions 23 of the lower leaf springs 20A and 20B and the elastic arm portion 33 of the upper leaf spring 30, the lens holding member 10 is inside the case 3 in the Z1-Z2 direction that is the optical axis direction. It is supported to move freely.

Next, operations of the lens driving device 1 having the above structure and a camera module using the lens driving device 1 will be described.
As shown in FIG. 5, when no driving current is applied to the coil 60, the lens holding member 10 is biased in the Z2 direction by the lower leaf springs 20 </ b> A and 20 </ b> B and the upper leaf spring 30. The lower surface facing in the Z2 direction is stable in a lowered posture that hits the stopper portions 45a and 45b of the support base 40.

  When a drive current is applied to the connection terminals 27 and 27 protruding from the support base 40, the drive current flows through the pair of lower leaf springs 20A and 20B to the coil 60 between the winding start end 61a and the winding end 61b. The lens holding member 10 is driven in the optical axis direction (Z1 direction) by an electromagnetic force generated by a drive current flowing through the coil 60 and a magnetic field generated from the magnet M. By the operation of the lens holding member 10, the image formed on the imaging element is focused by the lens body held by the lens holding member 10.

Next, a method for manufacturing the lens driving device 1 will be described with reference to FIGS.
As shown in FIG. 9, the case 3 has a Z1 direction in which the ceiling portion 3a is provided in an upside down posture facing gravity, and the support member 50 and the upper leaf spring 30 are disposed on the inner side (Z2 side) of the ceiling portion 3a. Install. The support bulge 56 formed on the corner support 52 of the support member 50 is inserted between the corner facing portion 31b of the upper plate spring 30 and the elastic arm 33, so that the support member 50 and the upper plate spring are inserted. 30 can be positioned and combined with each other. In this installation process (arrangement process), the support member 50 and the upper leaf spring 30 may be installed inside the case 3 in a state of being combined with each other, or the support member 50 may be installed in the case 3 first, The upper leaf spring 30 may be installed in the case 3. The upper leaf spring 30 installed in the case 3 is supported in a state where the side facing portion 31 a is in contact with a spring fixing surface 55 formed on the support member 50.

  At both end portions of the side facing portion 31a of the upper leaf spring 30, projecting portions 34 project from the outer edge portion 31c, and also at both end portions of the side support portion 51 of the support member 50, support projections from the outer side portion 51c. The part 54 protrudes. The protrusion 34 and the support protrusion 54 are opposed to or in contact with the inner surface of the side wall 3d of the case 3 so that the support member 50 and the upper leaf spring 30 are viewed from the Z2 side of the case 3 in the plan view. Position with respect to. As shown in FIG. 8, a gap (i) between the protrusion 34 provided on the upper leaf spring 30 and the inner surface of the side wall 3d is formed between the support protrusion 54 provided on the support member 50 and the side wall 3d. Since it is narrower than the gap (ii) with the inner surface, the upper leaf spring 30 is positioned mainly by facing the protrusion 34 and the inner surface of the side wall portion 3d, and the support member 50 is also positioned following this.

  In the central portion of the side facing portion 31a of the upper leaf spring 30, a gap δ2 is formed between the outer edge portion 31c and the inner surface of the side wall portion 3d, and in the central portion of the side support portion 51 of the support member 50, A gap δ3 is formed between the outer side portion 51c and the inner surface of the side wall portion 3d. The gaps δ2 and δ3 can absorb the tolerance of flatness in the central portion of the side wall portion 3d of the case 3, and even if the flatness of the central portion of the side wall portion 3d has a tolerance, the upper leaf spring 30 and the support member 50 can be positioned with reference to the inner surfaces of both end portions of the side wall portion 3d close to the square wall portion 3e of the case 3.

  Next, a fluid thermosetting adhesive is applied to the application area Pa shown in FIG. The adhesive enters the gap δa between the outer edge of the upper leaf spring 30 and the inner surface of the case 3, flows down by gravity, and enters between the case contact portion 53 of the support member 50 and the ceiling portion 3a. In addition, the adhesive flows down the gap δa and enters between the spring fixing surface 55 of the support member 50 and the side facing portion 31a of the upper leaf spring 30 by capillary action. A part of the adhesive remains in the gap δa.

  Next, as shown in FIG. 9, on the inner surface of the side wall 3d of the case 3 or the inner surface near the boundary between the side wall 3d and the corner wall 3e, the thermosetting adhesive having fluidity in the application region Pb. Apply. Each of the four magnets M can be installed on the four corner wall portions 3e by magnetically adhering the bonding surface Mb to the inner surface of the side wall portion 3d, and between the bonding surface Mb and the inner surface of the case 3 Adhesive is present. The four magnets M are positioned in the case 3 by bringing their upper surfaces Mc into contact with the magnet contact portions 57 formed on the corner support portions 52 of the support member 50. In the present embodiment, the same adhesive is used for the adhesive applied to the application area Pa and the adhesive applied to the application area Pb, but different adhesives can also be used.

  Thereafter, the process proceeds to a heating step, where the bonding is located between the case 3 and the support member 50, between the spring fixing surface 55 of the support member 50 and the side facing portion 31a of the upper leaf spring 30, and further within the gap δa. The adhesive and the adhesive interposed between the magnet M and the inner surface of the case 3 are all thermally cured at the same time. Thereby, as shown in FIG. 6, the support member 50, the fixed side support portion 31 of the upper leaf spring 30, and the four magnets M are fixed inside the case 3.

  In the same adhesive application process (supply process), between the case 3 and the support member 50, between the spring fixing surface 55 of the support member 50 and the side facing portion 31a of the upper leaf spring 30, and in the gap δa. Further, an adhesive may be supplied between the magnet M and the inner surface of the case 3. For example, a large amount of fluid adhesive is applied to the application region Pb shown in FIG. The magnet M is magnetically attracted to the inner surface of the case 3, and the magnet M is slid toward the ceiling portion 3a until it abuts on the magnet abutting portion 57. With the moving force of the magnet M at this time, the adhesive applied to the application region Pb is poured into the gap δa between the upper leaf spring 30 and the inner surface of the case 3 in the region W shown in FIG. 3 and the support member 50, and between the spring fixing surface 55 and the side facing portion 31 a of the upper leaf spring 30. And it transfers to a heating process. In addition, it is preferable to change the attitude | position of the case 3 so that the open Z2 side of the case 3 may face the direction which gravity acts after a heating process.

  Next, as shown in FIG. 2, an assembly 70 in which the support base 40, the lower leaf springs 20 </ b> A and 20 </ b> B, the conductive plates 25 </ b> A and 25 </ b> B, the lens holding member 10, and the coil 60 are combined. And the upper leaf spring 30 and the magnet M are inserted into the case 3 from the lower side (Z2 side). Alternatively, the case 3 is put on the assembly 70 and the two are combined. Then, the upward spring fixing surface 10a of the lens holding member 10 is abutted on the lower side of the movable side support portion 32 of the upper leaf spring 30, and the spring fixing surface 10a and the movable side support portion 32 are fixed with an adhesive. The support base 40 and the case 3 are also fixed to each other with an adhesive, and the lens driving device 1 is completed.

  In the embodiment, as shown in FIG. 4, the winding start end 61 a and winding end 61 b of the conductive wire constituting the coil 60 are wound around the protrusions 19 a and 19 b on the lower surface of the lens holding member 10. The portion and the lower leaf springs 20A and 20B are soldered to be conductive. However, the present invention has a structure in which the winding start end 61a and winding end 61b of the conductive wire extending from the coil 60 are directly connected to the lower leaf springs 20A and 20B by soldering or a conductive adhesive. Good.

DESCRIPTION OF SYMBOLS 1 Lens drive device 3 Case 3a Ceiling part 3b Opening part 3d Side wall part 3e Square wall part 10 Lens holding member 20A, 20B Lower leaf | plate spring 21 Fixed side support part 22 Movable side support part 23 Elastic arm part 30 Upper leaf | plate spring 31 Fixation Side support portion 31a Side surface facing portion 31b Square surface facing portion 32 Movable side support portion 33 Elastic arm portion 33a Boundary portion 34 Projection portion 40 Support base 50 Support member 51 Side portion support portion 52 Corner portion support portion 53 Case contact portion 54 Support protrusion 55 Spring fixing surface 57 Magnet contact portion 60 Coil M Magnet O Optical axis

Claims (21)

A support base; a case that covers the support base; a lens holding member that can be mounted at least partially inside the case and capable of mounting a lens body; and the lens holding member in an optical axis direction of the lens body. A plate spring movably supported; a coil mounted on the lens holding member; and a magnet provided in the case and facing the coil.
The leaf spring connects a fixed side support portion fixed to the inside of the case, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the lens driving device in which the elastic arm portion is integrally formed,
The fixed side support portion of the leaf spring has an outer edge portion along the inner surface of the case, and a plurality of protruding portions protruding from the outer edge portion toward the inner surface of the case are provided at intervals. A lens driving device. The case has a rectangular shape in plan view, and includes four side wall portions, a square wall portion located at a corner portion, a ceiling portion, and an opening formed in the ceiling portion,
The fixed side support portion of the leaf spring includes a side surface facing portion that faces the side wall portion, and a corner surface facing portion that faces the corner wall portion,
2. The lens driving device according to claim 1, wherein the projecting portions facing the inner surface of the side wall portion are integrally formed in at least two places excluding the central portion of each of the side facing portions.   A support member facing the ceiling portion is provided inside the case, and the fixed-side support portion is in contact with a spring fixing surface facing the support base side of the support member, and the case and the support The lens driving device according to claim 2, wherein the lens driving device is fixed with an adhesive between the member and between the support member and the fixed side support portion.   A gap is formed between the outer edge portion of the fixed-side support portion and the inner surface of the case between the two protruding portions located on both sides of the corner-facing portion. The lens driving device according to claim 3, wherein a part of the adhesive is present.   The spring fixing surface is provided on the support member so as to correspond to at least two places excluding the central portion of the side facing portion, and the side facing portion is provided in a region where the spring fixing surface is not provided. The lens driving device according to claim 3, wherein the support member is separated from the lens driving device.   The elastic arm portion of the leaf spring extends from the side facing portion, and the elastic arm portion of the side facing portion extends without the elastic arm portion overlapping the spring fixing surface. The lens driving device according to claim 5, wherein the portion is overlapped and bonded to the spring fixing surface. The support member is formed with a magnet abutting portion located between the angular surface facing portion of the leaf spring and the elastic arm portion and located on a side farther from the ceiling portion than the leaf spring. And
The lens driving device according to claim 3, wherein the magnet is bonded to the inner surface of the case in contact with the magnet contact portion.   The lens driving device according to claim 7, wherein the magnet and the elastic arm are opposed to each other in a direction parallel to the optical axis in a state of being separated from each other.   The support member includes a side support portion facing the inner surface of the side wall portion and a corner support portion facing the inner surface of the square wall portion, and the magnet contact portion supports the corner portion. The lens driving device according to claim 7, wherein the lens driving device is formed in the portion.   The lens driving device according to claim 9, wherein support protrusions that are opposed to the inner surface of the side wall portion are provided in at least two places excluding the central portion of the side support portion.   A lens driving device according to any one of claims 1 to 10, a lens body held by the lens holding member of the lens driving device, and an imaging element facing the lens body. Camera module to do. A support base; a case that covers the support base; a lens holding member that can be mounted at least partially inside the case and capable of mounting a lens body; and the lens holding member in an optical axis direction of the lens body. A plate spring movably supported; a coil mounted on the lens holding member; and a magnet provided in the case and facing the coil.
The leaf spring connects a fixed side support portion fixed to the inside of the case, a movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. In the manufacturing method of the lens driving device in which the elastic arm portion is integrally formed,
The leaf spring is provided with a plurality of protruding portions protruding toward the inner surface of the case at an interval on the outer edge portion along the inner surface of the case of the fixed side support portion,
A support member and the leaf spring are arranged inside the case, and at least the protruding portion is formed by bringing the fixed-side support portion into contact with a spring fixing surface facing the support base side of the support member. The adhesive is supplied between the outer edge portion of the fixed side support portion and the inner surface of the case in a region that is not, and between the case and the support member and between the support member and the fixed side support portion A method for manufacturing a lens driving device, comprising: fixing a gap between the two with an adhesive. The case has a rectangular shape in plan view, and includes four side wall portions, a square wall portion positioned at a corner portion, a ceiling portion, and an opening formed in the ceiling portion,
The fixed side support portion of the leaf spring includes a side surface facing portion that faces the side wall portion, and a corner surface facing portion that faces the corner wall portion,
The protrusions facing the inner surface of the side wall portion are integrally formed in at least two places excluding the central portion of each side surface facing portion,
The method for manufacturing a lens driving device according to claim 12, wherein the support member is fixed to the inside of the ceiling portion.   A gap is formed between the outer edge portion of the fixed side support portion and the inner surface of the case between the two protruding portions located on both sides of the corner facing portion, and in the gap, The method for manufacturing a lens driving device according to claim 13, wherein a part of the adhesive is present.   The spring fixing surface is provided on the support member so as to correspond to at least two places excluding the central portion of the side facing portion, and the side facing portion is provided in a region where the spring fixing surface is not provided. The method for manufacturing a lens driving device according to claim 13 or 14, wherein the support member and the support member are separated from each other.   The elastic arm portion of the leaf spring is formed so as to extend from the side facing portion, and the elastic arm portion of the side facing portion does not overlap the spring fixing surface. The method for manufacturing a lens driving device according to claim 15, wherein the extending portion is overlapped and adhered to the spring fixing surface. The support member is formed with a magnet abutting portion located between the angular surface facing portion of the leaf spring and the elastic arm portion and located on a side farther from the ceiling portion than the leaf spring. And
The method for manufacturing a lens driving device according to claim 13, wherein the magnet is brought into contact with the magnet contact portion to bond the magnet and the inner surface of the case.   The adhesive that fixes between the case and the support member and between the support member and the fixed-side support portion and the adhesive that fixes the magnet and the inner surface of the case are cured in the same heating process. The method for manufacturing a lens driving device according to claim 17.   The method for manufacturing a lens driving device according to claim 17 or 18, wherein the magnet and the elastic arm portion are opposed to each other in a direction parallel to the optical axis in a state of being separated from each other.   The support member includes a side support portion facing the inner surface of the side wall portion and a corner support portion facing the inner surface of the square wall portion, and the magnet contact portion supports the corner portion. The method for manufacturing a lens driving device according to claim 17, wherein the lens driving device is formed in a portion.   21. The lens driving device according to claim 20, wherein support protrusions facing the inner surface of the side wall portion are provided at at least two locations on the side support portion except for a central portion of the side support portion. Production method.

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