JP5368886B2 - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device for enhancing fixing strength of a first case body and a second case body combined in an optical axis direction, and suppressing passage of an electromagnetic wave between the inside and outside of the device in a comparatively simple configuration. <P>SOLUTION: The lens driving device 1 includes a movable body 2 for holding a lens, a drive mechanism for driving the movable body 2, and the first case body 11 and the second case body 12 mutually fixed to be combined in the optical axis direction. The first case body 11 is formed of a magnetic material and arranged in an object side so as to surround the drive mechanism. The second case body 12 is formed of a resin material and arranged in an anti-object side. An attaching recess 12b for attaching the lens driving device 1 to portable equipment is formed on the outer peripheral face of the second case body 12. An extending part 11e extended to the anti-object side is formed at a position avoiding the attaching recess 12b so as to be overlapped from the outside on the outer peripheral face of the second case body 12 in the first case body 11. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a lens driving device used in a relatively small camera mounted on a mobile phone or the like.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a moving lens body that moves in the optical axis direction while holding a plurality of lenses, and a moving lens via two leaf springs 2. Description of the Related Art A lens driving device including a fixed body that holds a body in a movable manner is known (for example, see Patent Document 1). In the lens driving device described in Patent Document 1, a driving coil is wound around the outer periphery of a cylindrical sleeve constituting a moving lens body. In this lens driving device, four magnets are arranged so as to face the outer peripheral surface of the driving coil.

  In this lens driving device, the fixed body includes a base for holding the image sensor, a case located on the subject side, and a back yoke sandwiched between the base and the case. The back yoke, and the case and the back yoke are fixed by, for example, bonding in a state where the end surfaces in the optical axis direction are in contact with each other. The back yoke functions as a cover that surrounds the four magnets.

  Here, inside the camera in which the lens driving device is used, a driving mechanism for driving the lens, and electronic components such as a driving circuit of the driving mechanism and an imaging device are arranged. Therefore, in a camera using a lens driving device, it is preferable to limit the passage of electromagnetic waves between the outside and the inside of the camera in order to prevent electromagnetic interference with the outside. That is, it is preferable to perform electromagnetic shielding in a camera in which a lens driving device is used. Thus, various configurations for performing electromagnetic shielding in a camera in which a lens driving device is used have been proposed (see, for example, Patent Document 2).

  In the camera described in Patent Document 2, in a housing formed of a housing in which a resin layer is formed on the front and back of a metal plate, a lid made of the metal plate, and a substrate on which a ground pattern is formed, A drive mechanism, electronic components, and the like for driving the lens are arranged, and the camera is electromagnetically shielded by this housing. Conventionally, various configurations for performing electromagnetic shielding have been proposed in cameras other than cameras using lens driving devices (see, for example, Patent Documents 3 and 4).

JP 2008-58659 A JP 2009-38445 A JP 2008-193666 A JP 2006-165624 A

  In the lens driving device described in Patent Document 1, as described above, the base and the back yoke are fixed by bonding in a state where the end surfaces in the optical axis direction are in contact with each other. For this reason, in this lens driving device, it is difficult to ensure a sufficient adhesion area between the base and the back yoke, and there is a possibility that sufficient fixing strength between the base and the back yoke cannot be ensured. Moreover, in the camera described in Patent Document 2, a housing in which a resin layer is formed on the front and back of a metal plate is used for electromagnetic shielding, and the configuration of the camera is complicated.

  Accordingly, an object of the present invention is to increase the fixing strength between the first case body and the second case body that are combined and fixed in the optical axis direction, and has a relatively simple configuration, so that the inside of the apparatus Another object of the present invention is to provide a lens driving device capable of suppressing the passage of electromagnetic waves between the outside and the outside.

In order to solve the above-described problems, a lens driving device according to the present invention is a lens driving device that is mounted and used in a portable device, and includes a movable body that holds a lens and is movable in the optical axis direction of the lens, and a movable body. A drive mechanism for driving in the optical axis direction, and a first case body and a second case body that are disposed so as to surround the movable body and the drive mechanism and are combined in the optical axis direction and fixed to each other; The one case body is made of a magnetic material and is formed in a substantially rectangular tube shape that is substantially rectangular when viewed from the optical axis direction, and is disposed on the subject side so as to surround the drive mechanism. The case body is made of a resin material and is formed in a substantially rectangular tube shape whose shape when viewed from the optical axis direction is a substantially quadrangular shape, and is disposed on the side opposite to the subject, and the outer periphery of the four corners of the second case body Mobile device on the surface A mounting recess for mounting the lens driving device is formed, the four corners of the first case body, notch is formed to the mounting recess is exposed, the first case body, be between notch, and In the position avoiding the mounting recess, an extending portion extending toward the non-subject side is formed so as to overlap the outer peripheral surface of the second case body from the outside, and each side surface of the first case body is provided in the optical axis direction. Two first end surfaces of the substantially parallel extending portion and two second end surfaces that are substantially orthogonal to the optical axis direction and that extend from the subject side end of the first end surface toward the four corners of the first case body are formed. On the outer peripheral surface of the second case body, there are formed an arrangement concave portion in which the extending portion is arranged, and a convex portion that protrudes to the outer peripheral side of the lens driving device from the mounting concave portion and the arrangement concave portion. And the mounting recess, and the subject side of the second case body in contact with the second end surface Is formed between the end face and the mounting recess, and the first case body and the second case body, characterized in that it is secured together by adhesive disposed recess, it is applied to the first end surface and the second end face .

  In the lens driving device of the present invention, the extending portion of the first case body arranged on the subject side extends to the anti-subject side so as to overlap the outer peripheral surface of the second case body arranged on the anti-subject side from the outside. Yes. For this reason, the bonding area between the first case body and the second case body is increased by utilizing the space between the outer peripheral surface of the second case body and the extension part where the extension part overlaps, and the end surface of the extension part. Is possible. Therefore, in the present invention, it is possible to increase the fixing strength between the first case body and the second case body.

  In the present invention, the extending portion of the first case body made of the magnetic material extends toward the non-subject side so as to overlap the outer peripheral surface of the second case body made of the resin material. Therefore, in addition to the subject side of the lens driving device on which the first case body formed of a magnetic material is disposed, the lens is also provided on the opposite side of the lens driving device on which the second case body formed of a resin material is disposed. It becomes possible to suppress the passage of electromagnetic waves between the inside and outside of the driving device. In other words, in the present invention, it is possible to suppress the passage of electromagnetic waves between the inside and the outside of the lens driving device with a relatively simple configuration in which the extending portion is formed in the first case body.

Further, in the present invention, the extending portion is formed at a position avoiding the mounting recess for mounting the lens driving device to the portable device. Therefore, in the present invention, it is possible to increase the fixing strength between the first case body and the second case body without hindering the attachment of the lens driving apparatus to the portable device, and the lens driving apparatus It is possible to suppress the passage of electromagnetic waves between the inside and the outside. In the present invention, each of the side surfaces of the first case body has two first end surfaces of the extending portion substantially parallel to the optical axis direction, and a subject side end of the first end surface substantially orthogonal to the optical axis direction. Since the two second end faces from the first case body toward the four corners of the first case body are formed, the first end face substantially parallel to the optical axis direction and the second end face substantially orthogonal to the optical axis direction are used, It becomes possible to adhere | attach 1 case body and 2nd case body. Therefore, it is possible to increase the fixing strength between the first case body and the second case body in both directions of the optical axis direction and the direction substantially orthogonal to the optical axis direction.

  In the present invention, it is preferable that the extending portion extends to the opposite side end of the second case body. If comprised in this way, compared with the case where the extension part is not extended to the anti-subject side edge of the 2nd case body, between the outer peripheral surface of the 2nd case body and the extension part, and the extension part Using the end face, it is possible to increase the bonding area between the first case body and the second case body. Therefore, the fixing strength between the first case body and the second case body can be further increased. Further, it is possible to effectively suppress the passage of electromagnetic waves between the inside and the outside of the lens driving device on the side opposite to the subject of the lens driving device where the second case body is disposed.

  As described above, according to the present invention, it is possible to increase the fixing strength between the first case body and the second case body that are combined and fixed in the optical axis direction, and with a relatively simple configuration, the lens It becomes possible to suppress the passage of electromagnetic waves between the inside and outside of the driving device.

It is a perspective view of the lens drive device concerning an embodiment of the invention. It is sectional drawing of the EE cross section of FIG. It is a disassembled perspective view of the lens drive device shown in FIG. It is a perspective view for demonstrating the arrangement | positioning relationship of the drive magnet part and drive coil which are shown in FIG. It is a side view of the drive magnet part and drive coil which are shown in FIG. It is a figure which shows a drive magnet piece and a drive coil from the HH direction of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the lens driving device 1 shown in FIG. FIG. 4 is a perspective view for explaining the positional relationship between the driving magnet unit 17 and the driving coil 18 shown in FIG. FIG. 5 is a side view of the drive magnet unit 17 and the drive coil 18 shown in FIG. FIG. 6 is a diagram illustrating the driving magnet piece 24 and the driving coil 18 from the HH direction in FIG. 5.

  The lens driving device 1 of this embodiment is used in a relatively small camera mounted on a portable device such as a cellular phone. That is, the lens driving device 1 is used by being mounted on a portable device. As shown in FIG. 1, the lens driving device 1 is formed in a substantially quadrangular prism shape as a whole. That is, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape.

  In the camera in which the lens driving device 1 of this embodiment is mounted, an image sensor (not shown) is arranged on the lower side (that is, the Z2 direction side) of FIG. 2, and the upper side (that is, the Z1 direction side) of FIG. The subject placed in is photographed. Therefore, in the following description, the Z1 direction side is the subject side (object side), and the Z2 direction side is the anti-subject side (imaging element side). In the following description, two directions orthogonal to the optical axis L and orthogonal to each other are defined as an X direction and a Y direction. In this embodiment, the four side surfaces of the lens driving device 1 are parallel to the X direction or the Y direction.

  As shown in FIGS. 1 and 2, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction. The movable body 2 is movably held by the fixed body 3 via two types of plate springs 5 and 6 (see FIG. 3). In addition, illustration of the leaf | plate springs 5 and 6 is abbreviate | omitted in FIG.

  The movable body 2 is fixed by electrically connecting a sleeve 8 that holds a lens holder 7 to which a plurality of lenses are fixed and an end of a driving coil 18 that constitutes the driving mechanism 4 by soldering or the like. Coil end fixing members 9 and 10. 2, illustration of the coil end fixing members 9 and 10 is omitted, and illustration of the lens holder 7 is omitted in FIG.

  The lens holder 7 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed on the inner peripheral side thereof. The sleeve 8 is formed in a substantially cylindrical shape, and holds the lens holder 7 on the inner peripheral side thereof. On the outer periphery of the sleeve 8, there are formed a fixing surface 8a for fixing a driving coil 18, which will be described later, constituting the driving mechanism 4, and a mounting surface 8b on which the driving coil 18 is mounted (FIG. 2). The coil end fixing members 9 and 10 are made of a conductive metal material. The coil end fixing members 9 and 10 are fixed to the end surface of the sleeve 8 on the side opposite to the subject.

  The fixed body 3 includes a first case body 11 disposed on the subject side and a second case body 12 disposed on the opposite subject side.

  The first case body 11 is formed of a magnetic material, and is formed in a substantially rectangular tube shape with a bottom (substantially bottomed rectangular tube shape) having a bottom portion 11a and a tube portion 11b. The first case body 11 of this embodiment is formed by, for example, drawing, and the thickness of the cylindrical portion 11b is thinner than the thickness of the bottom portion 11a. The first case body 11 is disposed so as to surround the outer peripheral sides of the drive mechanism 4 and the movable body 2.

  A circular through hole 11c is formed at the center of the bottom 11a disposed on the subject side. Cutout portions 11d are formed at the four corners of the cylindrical portion 11b on the non-subject side, and extending portions 11e extending toward the non-subject side are formed between the cutout portions 11d of the cylindrical portion 11b. In other words, the first case body 11 is formed with four extending portions 11e.

  The notch portion 11d is formed so as to be recessed from the opposite end of the cylindrical portion 11b toward the subject side. The extending part 11e is formed in a substantially rectangular shape, and two end faces (first surfaces) of the extending part 11e substantially parallel to the optical axis direction are formed on each of the four side surfaces 11f constituting the cylindrical part 11b. (End face) 11g and two end faces (second end faces) 11h parallel to the X direction or the Y direction and extending from the subject side end of the end face 11g toward the four corners of the first case body 11 are formed.

  The second case body 12 is formed of a resin material and is formed in a substantially rectangular tube shape. As shown in FIG. 3, a terminal 13 is fixed to the second case body 12. Further, the second case body 12 has a contact surface 12a (see FIG. 2) with which the end surface of the sleeve 8 on the side opposite to the subject contacts, and an attachment recess 12b for attaching the lens driving device 1 to a portable device such as a cellular phone. (Refer FIG. 3) and the arrangement | positioning recessed part 12c (refer FIG. 3) in which the extension part 11e of the 1st case body 11 is arrange | positioned are formed.

  The contact surface 12a is formed in a planar shape substantially perpendicular to the optical axis L. The attachment recesses 12 b are formed on the outer peripheral surfaces of the four corners of the second case body 12. The mounting recess 12b is formed to comply with, for example, the SMIA (Standard Mobile Imaging Architecture) standard. Specifically, the mounting recess 12b is directed from the side surface of the second case body 12 parallel to the Y direction to the inside of the X direction. It is formed to be depressed. The arrangement | positioning recessed part 12c is formed so that it may become depressed toward the X direction inner side or the Y direction inner side from the four side surfaces of the 2nd case body 12. FIG. Moreover, the arrangement | positioning recessed part 12c is formed in the center part of the side surface of the 2nd case body 12 in a X direction or a Y direction, and is formed so that it may not connect with the attachment recessed part 12b.

  The second case body 12 is attached to the anti-subject side of the first case body 11 so as to cover the outer peripheral side of the lens holder 7 on the anti-subject side. That is, the first case body 11 and the second case body 12 are combined in the optical axis direction. Specifically, the first case body 11 and the second case body 12 are combined and fixed to each other so that the extending portion 11e of the first case body 11 is disposed in the arrangement recess 12c of the second case body 12. Has been. That is, the first case body 11 and the second case body 12 are combined and fixed to each other so that the extending portion 11e overlaps the outer peripheral surface of the second case body 12 from the outside. The first case body 11 and the second case body 12 are combined and fixed so that the subject-side end face 12d of the second case body 12 and the end face 11h of the first case body 11 come into contact with each other.

  When the first case body 11 and the second case body 12 are combined, as shown in FIG. 1, the mounting recess 12b is disposed at a position corresponding to the notch 11d, and the mounting recess 12b is exposed. That is, the notch 11d is formed so that the mounting recess 12b is exposed. Moreover, the extension part 11e is arrange | positioned in the position which does not overlap with the attachment recessed part 12b. That is, the extending part 11e is formed at a position avoiding the mounting recess 12b. Further, the extending portion 11 e extends to the opposite end of the second case body 12. In other words, the end surface of the extending portion 11e on the side opposite to the subject and the end surface of the second case body 12 on the side opposite to the subject substantially coincide.

  In this embodiment, when the first case body 11 and the second case body 12 are combined, the outer peripheral surface of the first case body 11 and the outermost peripheral surface of the second case body 12 are as shown in FIG. They are arranged on substantially the same plane. That is, in this embodiment, the extending portion 11 e does not protrude outward in the radial direction from the outermost peripheral surface of the second case body 12.

  The first case body 11 and the second case body 12 are fixed by adhesion. For example, the first case body 11 and the second case body 12 are combined and fixed in the optical axis direction in a state where an adhesive is applied to the arrangement recess 12c and the end faces 11g and 11h of the first case body 11. .

  The leaf spring 5 includes a sleeve fixing portion that is fixed to the sleeve 8, a case body fixing portion that is fixed to the first case body 11, and a spring portion that connects the sleeve fixing portion and the case body fixing portion. It is arranged on the subject side of the body 2. The sleeve fixing portion is fixed to the end surface of the sleeve 8 on the subject side. The case body fixing portion is fixed to the surface on the side opposite to the subject of the bottom portion 11a of the first case body 11 via a spacer 14 formed in a substantially rectangular frame shape.

  The leaf spring 6 includes a sleeve fixing portion fixed to the sleeve 8, a case body fixing portion fixed to the second case body 12, and a spring portion connecting the sleeve fixing portion and the case body fixing portion. Arranged on the opposite side of the body 2. The sleeve fixing portion is fixed to the end surface of the sleeve 8 on the side opposite to the subject via the coil end fixing members 9 and 10. The case body fixing portion is fixed to the second case body 12.

  As shown in FIGS. 2, 4, and the like, the drive mechanism 4 includes four substantially triangular prism-shaped drives disposed at the four corners of the lens driving device 1 (specifically, the four corners inside the first case body 11). Four driving coils 18 wound in a substantially triangular tube shape, the inner peripheral side of which is disposed opposite to the outer peripheral surface of the driving magnet unit 17 with a predetermined gap, and the driving coil A magnetic member 19 that is fixed to the movable body 2 on the subject side with respect to 18, coil protection members 20 and 21 that are attached to the subject side and the non-subject side of the drive coil 18, and an anti-subject side of the drive magnet unit 17. And a magnetic plate 22 to be arranged.

  The drive magnet unit 17 is composed of two substantially triangular prism-shaped drive magnet pieces 23 and 24 arranged so as to overlap in the optical axis direction, and a flat plate-like magnet arranged between the drive magnet pieces 23 and 24. And a member 25.

  The driving magnet pieces 23 and 24 are formed so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle, and is substantially parallel to the optical axis L as shown in FIGS. And two orthogonal surface portions 23a, 24a that are orthogonal to each other, and one rectangular inclined surface portion 23b, 24b that is substantially parallel to the optical axis L and connects the two orthogonal surface portions 23a, 24a. Yes.

  The driving magnet pieces 23 and 24 are arranged such that the inner peripheral surface of the cylindrical portion 11b of the first case body 11 and the orthogonal surface portions 23a and 24a are substantially parallel to each other. Further, the four drive magnet pieces 23 are fixed to the bottom portion 11 a of the first case body 11. Specifically, the subject-side end surfaces of the four drive magnet pieces 23 are fixed to the surface of the bottom portion 11a on the side opposite to the subject by bonding or the like. Yes.

  The magnetic member 25 is made of a magnetic material. The magnetic member 25 is formed in a flat plate shape having a substantially right-angled isosceles triangle shape similar to that of the drive magnet pieces 23 and 24 when viewed from the optical axis direction.

  The magnetic plate 22 is formed of a magnetic material and has a flat plate shape. The magnetic plate 22 includes four cover portions 22a each having a substantially triangular shape that covers each of the end surfaces of the four drive magnet portions 17 on the side opposite to the subject, and four connection portions 22b that connect the four cover portions 22a. It consists of and.

  The cover 22a is formed so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle. The connecting portion 22b is formed in an elongated rectangular shape, and is arranged so as to be parallel to the X direction or the Y direction. The connecting portion 22 b connects the cover portions 22 a adjacent to each other in the circumferential direction of the lens driving device 1 on the outer peripheral end side of the magnetic plate 22, and the sleeve 8 is inserted through the center of the magnetic plate 22. The hole 22c is formed so as to penetrate in the optical axis direction.

  The magnetic plate 22 is fixed to the end surfaces of the four driving magnet pieces 24 on the side opposite to the subject. Specifically, the magnetic plate 22 is fixed to the four driving magnet pieces 24 by bonding or the like in a state where the cover portion 22a is in contact with the end surface of the driving magnet piece 24 on the side opposite to the subject. Moreover, the outer peripheral end of the magnetic plate 22 is in contact with the inner peripheral surface of the cylindrical portion 11b of the first case body 11, as shown in FIG.

  As shown in FIG. 6, the driving coil 18 is wound so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle, and is substantially parallel to the optical axis L and orthogonal to each other. Two rectangular orthogonal surface portions 18a and one rectangular inclined surface portion 18b that is substantially parallel to the optical axis L and connects the two orthogonal surface portions 18a are provided.

  The four drive coils 18 are fixed to the outer peripheral surface of the sleeve 8. Specifically, the inclined surface portion 18b is fixed to the fixed surface 8a by adhesion in a state where the surface of the inclined surface portion 18b opposite to the subject side is mounted on the mounting surface 8b of the sleeve 8. Further, the inclined surface portion 18b is fixed to the fixed surface 8a so that the inner peripheral surface of the driving coil 18 and the outer peripheral surface of the driving magnet portion 17 are substantially parallel via a predetermined gap, and the driving coil 18 are arranged at four corners inside the first case body 11. The drive coil 18 is disposed at four corners inside the first case body 11 with predetermined gaps between the drive coil 18 and the inner peripheral surface of the first case body 11, and together with the sleeve 8, the optical axis. It can move in the direction.

  As shown in FIG. 5, the two drive magnet pieces 23 and 24 constituting the drive magnet unit 17 are the same in the optical axis direction (S pole and S pole, or N pole and N pole). Are arranged to face each other. Therefore, as shown in FIGS. 5 and 6, a magnetic flux F passing through the orthogonal surface portion 18 a and the inclined surface portion 18 b of the drive coil 18 is generated between the drive magnet pieces 23 and 24.

  The magnetic member 19 is formed of a magnetic material and is formed in a substantially annular shape. In this embodiment, the driving magnet unit 17 and the driving coil 18 are attracted so that the magnetic member 19 is attracted toward the intermediate position of the driving magnet unit 17 in the optical axis direction within the movable range of the movable body 2. Has been placed.

  The coil protection members 20 and 21 are formed of a relatively hard resin material or metal material such as PET (polyethylene terephthalate), and are formed in a substantially rectangular frame shape as shown in FIG. In this embodiment, the coil protection member 20 is attached to the end surface on the subject side of the driving coil 18, and the coil protection member 21 is attached to the end surface on the side opposite to the subject of the driving coil 18.

(Main effects of this form)
As described above, in the present embodiment, the extending portion 11e of the first case body 11 disposed on the subject side is opposite to the outer peripheral surface of the second case body 12 disposed on the opposite subject side from the outside. It extends to the subject side. Therefore, the bonding area between the first case body 11 and the second case body 12 is increased using the extension portion 11e and the arrangement recess 12c and the end surfaces 11g and 11h of the first case body 11 and the like. Can do. Therefore, in this embodiment, the fixing strength between the first case body 11 and the second case body 12 can be increased.

  In particular, in this embodiment, since the extending portion 11e extends to the opposite end of the second case body 12 as compared with the end of the second case body 12, the extending portion 11e does not extend to the opposite end of the second case body 12. The bonding area between the first case body 11 and the second case body 12 can be further increased between the extending portion 11e and the arrangement recess 12c and on the end surface 11g of the first case body 11. Therefore, the fixing strength between the first case body 11 and the second case body 12 can be further increased.

  In this embodiment, two end surfaces 11g substantially parallel to the optical axis direction and two end surfaces 11h substantially orthogonal to the optical axis direction are formed on each of the side surfaces 11f of the first case body 11. . Therefore, by bonding the first case body 11 and the second case body 12 using the end faces 11g and 11h, the first case body 11 and the first case body 11 can be seen in both directions of the optical axis direction and the direction substantially orthogonal to the optical axis direction. The fixing strength with the second case body 12 can be increased. That is, when the first case body 11 and the second case body 12 are bonded using only the end face 11g, the fixing strength of the first case body 11 and the second case body 12 in the direction substantially orthogonal to the optical axis direction is increased. Although it is possible to increase, it is difficult to increase the fixing strength of the first case body 11 and the second case body 12 in the optical axis direction. On the other hand, when the first case body 11 and the second case body 12 are bonded using only the end surface 11h, it is possible to increase the fixing strength between the first case body 11 and the second case body 12 in the optical axis direction. However, it is difficult to increase the fixing strength of the first case body 11 and the second case body 12 in a direction substantially orthogonal to the optical axis direction. On the other hand, in this embodiment, the fixing strength between the first case body 11 and the second case body 12 can be increased in both the optical axis direction and the direction substantially orthogonal to the optical axis direction.

  In this embodiment, the extending portion 11e of the first case body 11 formed of a magnetic material extends toward the non-subject side so as to overlap the outer peripheral surface of the second case body 12 formed of a resin material. Therefore, in addition to the subject side of the lens driving device 1 in which the first case body 11 formed of a magnetic material is disposed, the anti-subject side of the lens driving device 1 in which the second case body 12 formed of a resin material is disposed. In this case, it is possible to suppress the passage of electromagnetic waves between the inside and the outside of the lens driving device 1. In particular, in the present embodiment, since the extending portion 11e extends to the opposite subject side end of the second case body 12, the lens driving device 1 on the opposite subject side of the lens driving device 1 where the second case body 12 is disposed. It is possible to effectively suppress the passage of electromagnetic waves between the inside and the outside. As described above, in this embodiment, it is possible to suppress the passage of electromagnetic waves between the inside and the outside of the lens driving device 1 with a relatively simple configuration in which the extending portion 11e is formed in the first case body 11. It becomes possible.

  In this embodiment, the extending portion 11e is formed at a position that does not overlap the mounting recess 12b for mounting the lens driving device 1 to the portable device. Therefore, in this embodiment, the fixing strength between the first case body 11 and the second case body 12 can be increased without hindering the attachment of the lens driving apparatus 1 to the portable device, and the lens driving apparatus. It becomes possible to suppress the passage of electromagnetic waves between the inside of 1 and the outside.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the above-described form, the end surface of the extension portion 11e on the side opposite to the subject and the end surface of the second case body 12 on the side opposite to the subject are substantially coincident with each other. The end surface of the two case body 12 on the side opposite to the subject may not substantially coincide. For example, the end surface on the side opposite to the subject of the extension portion 11e may be disposed closer to the subject side than the end surface on the side opposite the subject of the second case body 12, or the end surface on the side opposite to the subject of the extension portion 11e. The body 12 may be disposed on the side opposite to the subject than the end surface on the side opposite to the subject.

  In the embodiment described above, the four extending portions 11 e are formed in the first case body 11. In addition, for example, the number of extending portions 11e formed in the first case body 11 may be 5 or more, or 3 or less. Moreover, although the extension part 11e is formed in the substantially square shape in the form mentioned above, the extension part 11e may be formed in polygonal shapes other than square shape, and semicircle shape and a semi-elliptical shape. Etc. may be formed.

  In the embodiment described above, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is a substantially square shape. In addition, for example, the lens driving device 1 may be formed such that the shape when viewed from the optical axis direction is a substantially polygonal shape other than the substantially rectangular shape, or the shape when viewed from the optical axis direction. May be formed into a substantially circular shape or a substantially elliptical shape. That is, the first case body 11 and the second case body 12 may be formed in a substantially polygonal tube shape other than a substantially square tube shape, or may be formed in a substantially cylindrical shape or a substantially elliptical tube shape.

  In the embodiment described above, the drive magnet portion 17 is formed in a substantially triangular prism shape, but the drive magnet portion 17 may be formed in a substantially polygonal column shape other than a substantially triangular prism shape, a substantially cylindrical shape, or a substantially elliptical column shape. May be formed. In the above-described embodiment, the driving coil 18 is wound in a substantially triangular cylindrical shape, but the driving coil 18 may be wound in a substantially polygonal cylindrical shape other than the substantially triangular cylindrical shape, or a substantially cylindrical shape. It may be wound in a shape or a substantially oval cylindrical shape.

  In the embodiment described above, the drive coil 18 is fixed to the movable body 2 side and the drive magnet portion 17 is fixed to the fixed body 3 side. However, the drive magnet portion 17 is fixed to the movable body 2 side and fixed. The driving coil 18 may be fixed to the body 3 side. In the above-described embodiment, the lens driving device 1 includes the four driving magnet portions 17 and the four driving coils 18. However, the driving magnet portion 17 and the driving coil included in the lens driving device 1 are provided. The number of 18 may be 3 or less, or 5 or more.

  In the embodiment described above, the substantially triangular columnar driving magnet portions 17 are disposed at the four corners of the lens driving device 1, the substantially triangular cylindrical driving coil 18 is fixed to the outer peripheral surface of the sleeve 8, and the driving coil 18. The configuration of the present invention is applied to the lens driving device 1 in which the inner peripheral surface of the lens and the outer peripheral surface of the driving magnet portion 17 are arranged to face each other with a predetermined gap. In addition to this, for example, a lens driving device in which a driving coil is wound around an outer peripheral surface of a sleeve and a driving magnet is disposed so as to face the outer peripheral surface of the driving coil (for example, Patent Document 1 described above) The lens driving device according to the present invention may be applied, or a driving coil may be wound around the outer peripheral surface of the sleeve, and the driving coil may be opposed to the end surface in the optical axis direction of the driving coil. The configuration of the present invention may be applied to a lens driving device in which a magnet is arranged.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 4 Drive mechanism 11 1st case body 11d Notch part 11e Extension part 11f Side surface 11g End surface (1st end surface)
11h End face (second end face)
12 Second case body 12b Mounting recess L Optical axis Z1 Subject side Z2 Non-subject side

Claims (2)

In a lens driving device used by being mounted on a portable device,
A movable body that holds the lens and is movable in the optical axis direction of the lens, a drive mechanism for driving the movable body in the optical axis direction, and is disposed so as to surround the movable body and the drive mechanism. A first case body and a second case body which are combined in the optical axis direction and fixed to each other;
The first case body is made of a magnetic material and is formed in a substantially rectangular tube shape that is substantially square when viewed from the optical axis direction, and is disposed on the subject side so as to surround the drive mechanism. And
The second case body is made of a resin material and is formed in a substantially rectangular tube shape having a substantially square shape when viewed from the optical axis direction, and is disposed on the opposite subject side,
On the outer peripheral surfaces of the four corners of the second case body, attachment recesses for attaching the lens driving device to the portable device are formed,
Cutouts are formed at the four corners of the first case body so that the mounting recess is exposed,
An extending portion extending toward the non-subject side so as to overlap the outer peripheral surface of the second case body from the outside at a position between the cutout portions of the first case body and avoiding the mounting recess. Formed,
Each of the side surfaces of the first case body includes two first end surfaces of the extending portion that are substantially parallel to the optical axis direction and a subject side end of the first end surface that is substantially orthogonal to the optical axis direction. And two second end faces toward the four corners of the first case body,
On the outer peripheral surface of the second case body, there are formed a disposition concave portion in which the extending portion is disposed, and a convex portion that protrudes toward the outer peripheral side of the lens driving device from the mounting concave portion and the disposition concave portion,
The convex portion is formed between the placement concave portion and the mounting concave portion, and between the subject-side end surface of the second case body with which the second end surface abuts and the mounting concave portion,
The lens driving device, wherein the first case body and the second case body are fixed to each other by an adhesive applied to the arrangement recess, the first end surface, and the second end surface .   The lens driving device according to claim 1, wherein the extending portion extends to an end on the side opposite to the subject of the second case body.

Images