JP2008058659A - Lens drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive unit capable of enhancing various kinds of efficiency by reducing useless space. <P>SOLUTION: In the lens drive unit 10, the outer peripheral shape of a drive coil 14 is circular when viewed from an optical axis direction, but the cylindrical barrel part 160 of a back yoke 16 has such shape that the corner parts of a square 50 are chamfered, so that the width is narrow in areas equivalent to the sides of the square 50 and the width is wide in areas equivalent to the corner parts 51, 52, 53 and 54 of the square 50 between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical barrel part 160 of the back yoke 16. Then, four magnets 17 are arranged along the inner peripheral surface of the cylindrical barrel part 160 of the back yoke 16 at the respective corner parts 51, 52, 53 and 54 in the cylindrical barrel part 160 of the back yoke 16 in accordance with such structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens driving device that drives a lens in an optical axis direction to form an image of a subject.

  In recent years, as camera-equipped mobile phones equipped with cameras have become popular, opportunities for photographing various subjects using the mobile phones have increased. For example, you can shoot a subject that is far away from the camera lens, such as a friend or landscape (normal shooting), or a subject that is close to the camera lens, such as a bus timetable or petals (close-up shooting) There is a case.

  In close-up photography (macro photography), the lens position of the camera needs to be slightly closer to the subject side than the lens position during normal photography. For this reason, this type of photographic lens system includes a drive mechanism that drives the lens to move in the direction of the optical axis, so that the lens can be moved in the direction of the optical axis by driving the drive mechanism by switching a switch. (For example, see Patent Documents 1 and 2).

A lens driving device disclosed in Patent Document 1 includes a moving lens body including a lens, a magnetic driving unit (including a magnet and a coil) that moves the moving lens body in the optical axis direction of the lens, and a moving lens. It is comprised from the cover part which covers all or one part of a body and a magnetic drive part. And since the moving lens body located in the approximate center of a lens drive device is a substantially cylindrical shape, the components (magnet or coil) surrounding the periphery also have an annular shape (doughnut shape).
Japanese Patent Laying-Open No. 2005-37865 (FIG. 7) JP 2004-184779 A

  However, since the recent external design of the lens driving device has a square (prism) shape in consideration of positioning and assembling properties, as described above, if the magnets and coils are in an annular shape, they are wasted at the four corners in the lens driving device. There was a disadvantage that a new space was born. That is, when designing the shape of the magnet or coil, only the awareness that it is necessary to make the inner peripheral shape of the magnet or coil conform to the shape of the lens holder (cylindrical shape). It is a fact. For this reason, the outer peripheral shape of the magnet and coil is also formed in an annular shape like the inner peripheral shape, and there is a wasteful space between the magnet or coil and the lens driving device (cover portion) formed in a square shape. It has occurred.

  Such problems include the case where the moving lens body and the lens driving device are different in shape, such as the moving lens body having a substantially rectangular tube shape and the lens driving device having a cylindrical shape, or the outer peripheral shape of the moving lens body and the lens driving device. Even when there is a narrow portion and a wide portion between the outer peripheral surface of the moving lens body and the outer peripheral surface of the lens driving device, the same occurs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens driving device capable of reducing various useless spaces and improving various efficiencies.

  In order to solve the above problems, in the present invention, a moving lens body provided with a lens, a driving coil wound around the outer periphery of the moving lens body, and a magnet for generating a linkage magnetic field in the driving coil And a fixed body having a cover portion surrounding the moving lens body and the magnet, the inner peripheral shape of the cover portion is non-circular when viewed from the optical axis direction, and the magnet Is arranged along the inner peripheral surface of the cover part.

  In the present invention, since the shape of the magnet is in accordance with the inner peripheral shape of the cover portion, the space between the inner peripheral surface of the cover portion and the outer peripheral surface of the drive coil can be effectively used as a magnet placement space, and dead space can be reduced. Can be reduced. In addition, since the magnet can be efficiently filled between the inner peripheral surface of the cover part and the outer peripheral surface of the drive coil, a magnetic field linked to the drive coil can be efficiently formed because a magnet having a large volume can be used. can do.

  In another embodiment of the present invention, a moving lens body provided with a lens, a driving coil wound around the outer periphery of the moving lens body, a magnet for generating a linkage magnetic field in the driving coil, and the moving In a lens driving device having a lens body and a fixed body having a cover portion surrounding the magnet, the inner peripheral shape of the cover portion and the outer peripheral shape of the drive coil are different when viewed from the optical axis direction. The magnet is arranged along the inner peripheral surface of the cover part.

  In the present invention, since the shape of the magnet is in accordance with the inner peripheral shape of the cover portion, the space between the inner peripheral surface of the cover portion and the outer peripheral surface of the drive coil can be effectively used as a magnet placement space, and dead space can be reduced. Can be reduced. In addition, since the magnet can be efficiently filled between the inner peripheral surface of the cover part and the outer peripheral surface of the drive coil, a magnetic field linked to the drive coil can be efficiently formed because a magnet having a large volume can be used. can do.

  In the present invention, it is possible to adopt a configuration in which a plurality of the magnets are arranged separately at a plurality of locations in the circumferential direction.

  In the present invention, when the drive coil is wound in an annular shape and the inner peripheral shape of the cover portion is a polygon, the magnet is a plurality of corner portions of the inner peripheral shape of the cover portion. It is preferable to arrange at a position including at least one corner portion.

  In this invention, when the inner peripheral shape of the said cover part is a square or the polygon which chamfered the corner | angular part of the said square, it is preferable that the said magnet is arrange | positioned at the corner | angular part of the said square.

  In this invention, it is preferable that the said cover part is a cylindrical trunk | drum of a back yoke, and it is preferable that the said magnet is being fixed to the internal peripheral surface of the said cylindrical trunk | drum of the said back yoke.

  In this invention, it is preferable that the said back yoke is provided with the inner yoke part extended from the said cylindrical trunk | drum to the inner position of the said drive coil.

  In the present invention, it is preferable that a coil yoke is disposed on the drive coil on the side opposite to the side where the magnet is located. If comprised in this way, the magnetic flux density linked with a drive coil can be raised.

  In the present invention, it is possible to adopt a configuration in which the magnet is disposed on the outer peripheral side of the drive coil and a configuration in which the magnet is disposed on one side in the optical axis direction with respect to the drive coil. However, from the viewpoint of reducing the thickness of the lens driving device, the magnet is preferably arranged on the outer peripheral side of the driving coil.

  In this invention, when the said magnet is arrange | positioned at the outer peripheral side of the said drive coil, the said magnet can employ | adopt the structure magnetized by the pole which is different in an inside and outside direction.

  In the present invention, the magnet includes two magnet pieces magnetized to different poles in the optical axis direction, and the two magnet pieces are arranged to overlap in the optical axis direction so that the same poles are in contact with each other. May be adopted. If comprised in this way, since a magnetic force line generate | occur | produces in high density in the vicinity of the overlap part of two magnet pieces, the magnetic field linked to a drive coil can be formed efficiently.

  In the present invention, the magnet includes a plurality of magnet pieces arranged to overlap in the optical axis direction, and a plurality of the drive coils are arranged in the optical axis direction to face each of the plurality of magnet pieces. Preferably, each of the plurality of magnet pieces is magnetized with different poles in the inner and outer directions, and the magnetizing directions in the inner and outer directions between adjacent magnet pieces in the optical axis direction are opposite. If comprised in this way, the magnetic flux density linked with a drive coil can be raised.

  In the present invention, the magnet includes a plurality of divided magnetization regions arranged in the optical axis direction, and a plurality of the drive coils are arranged in the optical axis direction so as to face each of the plurality of divided magnetization regions. Each of the plurality of divided magnetization regions may be magnetized to different poles in the inner and outer directions, and the magnetization directions in the inner and outer directions may be opposite between adjacent magnetization regions in the optical axis direction. preferable. If comprised in this way, the magnetic flux density linked with a drive coil can be raised.

  In the present invention, the fixed body includes a base disposed on the imaging element side in the optical axis direction with respect to the cylindrical body portion of the back yoke, and a light beam with respect to the cylindrical body portion of the back yoke. It is preferable that the back yoke, the base, and the case have substantially the same outer peripheral shape when viewed from the optical axis direction.

  In the present invention, it is preferable that the fixed body includes a plate-like cover that covers the case on the subject side. With this configuration, it is possible to prevent foreign matters such as dust from entering the lens driving device.

  In this invention, it is preferable that the said plate-shaped cover is extended toward the said base, and the engaging leg part engaged with the said base is extended.

  In the present invention, it is preferable to include an urging member that exerts an urging force for holding the movable lens body at a predetermined position in the optical axis direction regardless of whether or not the drive coil is energized.

  In the present invention, the biasing member may be a spring member that is disposed between the moving lens body and the fixed body and applies a mechanical biasing force to the moving lens body.

  In the present invention, the urging member may be a magnetic body that is disposed on the moving lens body and applies a magnetic urging force to the moving lens body between the urging member and the magnet.

  In the present invention, it is preferable that the moving lens body can change the number of the magnetic bodies that can be mounted and the size of the magnetic body that can be mounted.

  In the present invention, it is preferable that the drive coil is directly wound around the moving lens body. If comprised in this way, the space which a drive coil occupies can be reduced compared with the case where a bobbin etc. are used. In addition, when the space occupied by the drive coil is the same, the number of turns of the drive coil can be increased.

  According to the lens driving device according to the present invention, since the shape of the magnet is made to conform to the inner peripheral shape of the cover portion, the space between the inner peripheral surface of the cover portion and the outer peripheral surface of the drive coil is used as a magnet arrangement space. It can be used effectively and dead space can be reduced. In addition, since the magnet can be efficiently filled between the inner peripheral surface of the cover part and the outer peripheral surface of the drive coil, a magnetic field linked to the drive coil can be efficiently formed because a magnet having a large volume can be used. can do. Therefore, driving efficiency, current utilization efficiency, and energy saving efficiency can be improved.

  The best mode for carrying out the present invention will be described with reference to the drawings. The lens driving device described below can be attached to various electronic devices in addition to the camera-equipped mobile phone. For example, it can be used for a PHS, a PDA, a barcode reader, a thin digital camera, a surveillance camera, a camera for checking the back of a car, a door having an optical authentication function, and the like.

[Embodiment 1]
(overall structure)
FIGS. 1A and 1B are an external view and an exploded perspective view, respectively, of a lens driving device according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the lens driving device shown in FIG. 1 taken along the lens optical axis.

  1A, 1B, and 2, the lens driving device 10 according to the present embodiment is a thin camera such as a digital camera or a camera-equipped mobile phone. Are moved in both directions, the A direction (front side) approaching the subject (object side) and the B direction (rear side) approaching the opposite side (image side) of the subject. The lens 121, 122, 123 and the fixed stop 124 are integrally held on the cylindrical lens holder 12, and the lens driving mechanism 5 moves the moving lens body 3 along the lens optical axis X. And a fixed body 2 on which the lens driving mechanism 5 and the moving lens body 3 are mounted. The movable lens body 3 includes a cylindrical sleeve 15, and a cylindrical lens holder 12 is fixed to the inside thereof.

  In the present embodiment, the fixed body 2 includes a base 19 for holding an image sensor (not shown) on the image side, and a case 11 located on the subject side. A circular incident window 110 for taking the reflected light into the lens is formed. The fixed body 2 includes a back yoke 16 sandwiched between the base 19 and the case 11, and the cylindrical body portion 160 of the back yoke 16 functions as a cover portion surrounding the magnet 17 described later. In addition, an interlinkage magnetic field generator that generates an interlinkage magnetic field in the drive coil 14 together with the magnet 17 is configured.

(Configuration of the lens driving mechanism 5)
3A, 3B, and 3C are a plan view, a longitudinal sectional view, and an explanatory view of a magnet of a magnetic circuit used in the lens driving mechanism of the lens driving device shown in FIG. FIG. 4 is an explanatory diagram showing a lens driving operation in the lens driving device shown in FIG. 1. FIG. 4 (a) shows a state where the moving lens body is located on the image sensor side, and FIG. b) shows a state in which the moving lens body is located on the subject side. In FIGS. 3B and 3C, the magnetization direction with respect to the magnet is indicated by an arrow.

  As shown in FIGS. 1 (b), 2, 3 (a), (b), (c) and FIGS. 4 (a), (b), the lens driving mechanism 5 is directly on the outer peripheral surface of the sleeve 15. A wound annular drive coil 14 and a linkage magnetic field generator 4 for generating a linkage magnetic field in the drive coil 14, and a magnetic circuit is constituted by the drive coil 14 and the linkage magnetic field generator 4. Yes. Further, the lens driving device 10 is formed with a power feeding unit (not shown) for the driving coil 14.

  In this embodiment, the interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  The cylindrical body portion 160 of the back yoke 16 is sandwiched between the base 19 and the case 11, and the imaging element side end portion of the cylindrical body portion 160 of the back yoke 16 is bonded and fixed to the base 19. An end on the subject side of the cylindrical body 160 of the back yoke 16 is bonded and fixed to the case 11. In this way, the cylindrical body portion 160 of the back yoke 16 is exposed on the side surface of the lens driving device 10 and constitutes the side surface portion thereof.

  The lens driving mechanism 5 includes a first plate spring 131 sandwiched between the cylindrical body 160 of the back yoke 16 and the base 19, and the cylindrical body 160 of the back yoke 16 and the case. 11 is provided with a second leaf spring 132 that is sandwiched between the second leaf spring 132 and the second leaf spring 132. Here, the first leaf spring 131 has a small hole 136 formed in an elastic deformation portion inside thereof, and a small protrusion 151 that fits into the small hole 136 is formed at the image sensor side end portion of the sleeve 15. The first plate spring 131 is capable of urging the movable lens body 3 in the optical axis direction by connecting the elastic deformation portion to the image sensor side end portion of the sleeve 15. The first leaf spring 131 has a function of preventing the sleeve 15 from rotating.

  The second leaf spring 132 has a small hole 137 formed in the elastic deformation portion on the inner side thereof, and a small protrusion 152 that fits in the small hole 137 is formed at the subject side end portion of the sleeve 15. The leaf spring 132 has an elastically deformable portion connected to the subject side end of the sleeve 15 and can bias the movable lens body 3 in the optical axis direction. The second leaf spring 132 also has a function of preventing the sleeve 15 from rotating.

  Note that the state shown in FIG. 4A is a state in which the drive coil 14 is not energized, and the imaging element side end of the moving lens body 3 is in contact with the upper surface (stopper part) of the base 19. The position of the moving lens body 3 is the origin position.

  When the lens driving device 10 configured as described above is viewed from the optical axis direction, the cylindrical body portion 160 of the back yoke 16 has a shape obtained by chamfering corners 51, 52, 53, and 54 of a quadrangle 50 indicated by a two-dot chain line. I have. Further, the base 19 and the case 11 also have a shape in which square corners are chamfered, and the size is the same as the cylindrical body 160 of the back yoke 16. Accordingly, the outer peripheral shape of the cylindrical body 160, the base 19 and the case 11 of the back yoke 16 defines the outer peripheral shape of the lens driving device 10.

  In the moving lens body 3, since the sleeve 15 is a cylindrical body, the drive coil 14 is wound in an annular shape. On the other hand, the inner peripheral shape of the cylindrical body portion 160 of the back yoke 16 is different from the outer peripheral shape of the drive coil 14 and is non-circular (in this embodiment, a polygon). For this reason, the width between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body 160 of the back yoke 16 is narrow in a region corresponding to the side of the quadrangle 50, and the square corners 51, 52, The area corresponding to 53 and 54 is wide.

  Therefore, in this embodiment, the four magnets 17 are arranged separately from each of the corner portions 51, 52, 53, 54 of the cylindrical body portion 160 of the back yoke 16. In addition, all of the four magnets 17 have an arc shape in which the inner surface conforms to the outer peripheral shape of the drive coil 14 in a plan view, while the outer surface has the corner portions 51, 52, 53, 54 of the cylindrical body portion 160. It has a shape along the inner peripheral surface.

(Operation)
In the lens driving device 10 configured as described above, all of the four magnets 17 are magnetized to different poles in the inner and outer directions, and form a linkage magnetic field in the driving coil 14 via the back yoke 16. Accordingly, when the drive coil 14 is energized, the moving lens body 3 receives a thrust (electromagnetic force) directed toward the subject as shown by an arrow A in FIGS. 2, 3 (b) and 4 (a). As shown in FIG. 4B, the object moves to the subject side. At that time, since the first plate spring 131 and the second plate spring 132 are bent toward the subject, a biasing force for returning the movable lens body 3 to the origin position is exhibited. Accordingly, the moving lens body 3 stops at a position where the electromagnetic force acting on the moving lens body 3 and the urging force of the first plate spring 131 and the second plate spring 132 are balanced.

  When the energization to the drive coil 14 is stopped from this state, the movable lens body 3 has the first leaf spring 131 and the second spring 131 as shown by an arrow B in FIGS. 2, 3B, and 4B. The plate spring 132 returns to the origin position by the urging force of the plate spring 132. At that time, the drive coil 14 may be energized in the direction opposite to that when the moving lens body 3 is driven toward the subject.

(Main effects of this form)
As described above, in the lens driving device 10 according to the present embodiment, the outer peripheral shape of the driving coil 14 is circular when viewed from the optical axis direction, whereas the cylindrical body portion 160 of the back yoke 16 has a rectangular shape 50. Since the corner portion is chamfered, the region between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 is an area corresponding to the side of the quadrangle 50. The width is narrow, and the width is wide in regions corresponding to the corners 51, 52, 53, 54 of the quadrangle 50. Corresponding to this structure, in this embodiment, the four magnets 17 are respectively connected to the corners 51, 52, 53, 54 of the cylindrical body 160 of the back yoke 16 within the cylindrical body 160 of the back yoke 16. Since it is arranged along the peripheral surface, the space between the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 and the outer peripheral surface of the drive coil 14 can be effectively used as an arrangement space for the magnet 17 and the dead space is reduced. it can. Further, since the magnet 17 can be efficiently filled between the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 and the outer peripheral surface of the drive coil 14, a large volume of the magnet 17 can be used. A magnetic field interlinking with the coil 14 can be efficiently formed. Therefore, driving efficiency, current utilization efficiency, and energy saving efficiency can be improved.

[Embodiment 2]
5A, 5B, and 5C are a plan view, a longitudinal sectional view, and an explanatory view of a magnet of a magnetic circuit used in the lens driving mechanism of the lens driving device according to Embodiment 2 of the present invention. is there. Since the basic configuration of the second embodiment and later-described third to eighth embodiments is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 5A and 5B, in this embodiment as well, as in the first embodiment, the lens drive mechanism 5 includes an annular drive coil 14 that is wound directly on the outer peripheral surface of the sleeve 15. The drive coil 14 includes a linkage magnetic field generator 4 that generates a linkage magnetic field, and the drive coil 14 and the linkage magnetic field generator 4 constitute a magnetic circuit. The interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 (cover portion) surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  Similar to the first embodiment, the cylindrical body portion 160 of the back yoke 16 has a shape in which square corner portions 51, 52, 53, and 54 are chamfered. On the other hand, since the moving lens body 3 is a cylindrical body, the drive coil 14 is wound in an annular shape. For this reason, the width between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body 160 of the back yoke 16 is narrow in a region corresponding to a rectangular side, and the rectangular corners 51, 52, The area corresponding to 53 and 54 is wide. Therefore, also in this embodiment, the four magnets 17 are arranged separately from each of the corner portions 51, 52, 53, 54 of the cylindrical body portion 160 of the back yoke 16. In addition, all of the four magnets 17 have an arc shape in which the inner surface conforms to the outer peripheral shape of the drive coil 14 in plan, while the outer surface extends along the inner peripheral surface of the cylindrical body 160 of the back yoke 16. It has a shape.

  Here, each of the four magnets 17 includes two magnet pieces 170 that are magnetized to different poles in the optical axis direction, and the two magnet pieces 170 are stacked in the optical axis direction so that the same poles are in contact with each other. Has been. For example, the two magnet pieces 170 are arranged so as to overlap in the optical axis direction so that the N poles are in contact with each other.

  In the lens driving device 10 configured as described above, as in the first embodiment, the four magnets 17 are connected to the corners 51, 52, 53, and 54 of the cylindrical body 160 of the back yoke 16. Since it is arranged along the inner peripheral surface of the cylindrical body portion 160, the space between the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 and the outer peripheral surface of the drive coil 14 is effective as an arrangement space for the magnet 17. It can be used and dead space can be reduced.

  Each of the four magnets 17 includes two magnet pieces 170 that are magnetized to different poles in the optical axis direction, and the two magnet pieces 170 are arranged so as to be in contact with each other in the optical axis direction. ing. For this reason, since the lines of magnetic force are generated at a high density in the vicinity of the overlapping portion of the two magnet pieces 170, a magnetic field linked to the drive coil 14 can be efficiently formed.

[Embodiment 3]
6A, 6B, and 6C are a plan view, a longitudinal sectional view, and an explanatory view of a magnet of a magnetic circuit used in the lens driving mechanism of the lens driving device according to Embodiment 3 of the present invention. is there.

  As shown in FIGS. 6A and 6B, in this embodiment as well, as in the first embodiment, the lens driving mechanism 5 includes an annular driving coil 14 that is wound directly on the outer peripheral surface of the sleeve 15. The drive coil 14 includes a linkage magnetic field generator 4 that generates a linkage magnetic field, and the drive coil 14 and the linkage magnetic field generator 4 constitute a magnetic circuit. The interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 (cover portion) surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  The cylindrical body portion 160 of the back yoke 16 has a shape in which square corner portions 51, 52, 53, and 54 are chamfered. On the other hand, since the moving lens body 3 is a cylindrical body, the drive coil 14 is wound in an annular shape. For this reason, the width between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body 160 of the back yoke 16 is narrow in a region corresponding to a rectangular side, and the rectangular corners 51, 52, The area corresponding to 53 and 54 is wide. Therefore, also in this embodiment, the four magnets 17 are arranged separately from each of the corner portions 51, 52, 53, 54 of the cylindrical body portion 160 of the back yoke 16. In addition, all of the four magnets 17 have an arc shape in which the inner surface conforms to the outer peripheral shape of the drive coil 14 in plan, while the outer surface extends along the inner peripheral surface of the cylindrical body 160 of the back yoke 16. It has a shape.

  Here, all of the four magnets 17 are magnetized to different poles in the inner and outer directions. Further, the back yoke 16 includes an inner yoke portion 161 that extends from the lower end portion of the cylindrical body portion 160 to the inner position through the lower portion of the moving lens body 3 at four locations in the circumferential direction where the magnet 17 is disposed. The inner yoke portion 161 is opposed to the magnet 17 with the drive coil 14 therebetween. Specifically, for example, the lens holder 12 and the sleeve 15 are spaced apart from each other in the radial direction, and the upper ends of the lens holder 12 and the sleeve 15 are connected to each other. The yoke part 161 is extended. Further, a notch may be formed in the lens holder 12, and the inner yoke portion 161 may be extended into the notch.

  In the lens driving device 10 configured as described above, as in the first embodiment, the four magnets 17 are connected to the corners 51, 52, 53, and 54 of the cylindrical body 160 of the back yoke 16. Since it is arranged along the inner peripheral surface of the cylindrical body portion 160, the space between the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 and the outer peripheral surface of the drive coil 14 is effective as an arrangement space for the magnet 17. It can be used and dead space can be reduced.

  Further, since the back yoke 16 includes the inner yoke portion 161 extending to the inner position of the drive coil 14, a magnetic field interlinking with the drive coil 14 can be efficiently formed.

[Embodiment 4]
7A, 7B, and 7C are a plan view, a longitudinal sectional view, and an explanatory view of a magnet of a magnetic circuit used in the lens driving mechanism of the lens driving device according to Embodiment 4 of the present invention. is there.

  As shown in FIGS. 7A and 7B, in this embodiment as well, as in Embodiment 1, the lens drive mechanism 5 includes a drive coil 14 that is wound directly on the outer peripheral surface of the moving lens body 3, and The drive coil 14 includes a linkage magnetic field generator 4 that generates a linkage magnetic field, and the drive coil 14 and the linkage magnetic field generator 4 constitute a magnetic circuit. The interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 (cover portion) surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  Here, since the moving lens body 3 has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered, the drive coil 14 also has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered. It has. On the other hand, the cylindrical body portion 160 of the back yoke 16 also has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered, but the outer peripheral surface of the drive coil 14 and the tube of the back yoke 16 are also provided. Between the inner peripheral surface of the cylindrical body 160, the width is narrow in a region corresponding to a square side, and the width is wide in regions corresponding to square corners 51, 52, 53, and 54. Therefore, also in this embodiment, the four magnets 17 are arranged separately from each corner portion of the cylindrical body portion 160 of the back yoke 16.

  As with the first to third embodiments, the outer surface of each of the four magnets 17 has a shape along the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16, but in this embodiment, the drive coil 14 in the optical axis direction. In this embodiment, the inner yoke 162 is provided separately from the back yoke 16 (cylindrical body portion 160). The inner yoke 162 is fixed to the inner surface of the magnet 17, and its end portion is the drive coil 14. Is opposed to the back yoke 16 (tubular body 160).

  In the lens driving device 10 configured as described above, the outer peripheral shape of the drive coil 14 and the inner peripheral shape of the cylindrical body portion 160 of the back yoke 16 are substantially the same, but the outer peripheral surface of the drive coil 14 and the back yoke 16 are the same. The magnet 17 is attached to the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 for each of the wide regions (regions corresponding to square corners) between the inner peripheral surface of the cylindrical body portion 160. It is arranged along. For this reason, the space between the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 and the outer peripheral surface of the drive coil 14 can be effectively used as an arrangement space for the magnet 17 and the dead space can be reduced.

[Embodiment 5]
8A, 8B, and 8C are a plan view, a longitudinal sectional view, and an explanatory view of a coil yoke of a magnetic circuit used in a lens driving mechanism of a lens driving device according to Embodiment 5 of the present invention. It is.

  As shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, in this embodiment as well, the lens driving mechanism 5 is driven directly wound around the outer peripheral surface of the moving lens body 3 as in the first embodiment. A coil 14 and a linkage magnetic field generator 4 for generating a linkage magnetic field in the drive coil 14 are provided, and the drive coil 14 and the linkage magnetic field generator 4 constitute a magnetic circuit. The interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 (cover portion) surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  Here, since the moving lens body 3 has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered, the drive coil 14 also has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered. It has. On the other hand, the cylindrical body portion 160 of the back yoke 16 also has a shape in which the square corner portions 51, 52, 53, and 54 are chamfered, but the outer peripheral surface of the drive coil 14 and the tube of the back yoke 16 are also provided. Between the inner peripheral surface of the cylindrical body 160, the width is narrow in a region corresponding to a square side, and the width is wide in regions corresponding to square corners 51, 52, 53, and 54. Therefore, also in this embodiment, the four magnets 17 are arranged separately from each corner portion of the cylindrical body portion 160 of the back yoke 16.

  Each of the four magnets 17 is magnetized with different poles in the inner and outer directions as in the first to third embodiments, and forms a linkage magnetic field in the drive coil 14 via the back yoke 16. In this embodiment, a coil yoke 165 is disposed on the side (inner peripheral side) opposite to the side on which the magnet 17 is disposed with respect to the drive coil 14. For this reason, since the magnetic force line which came out of the magnet piece 170 can be guide | induced efficiently so that it may link with the drive coil 14, an interlinkage magnetic flux density is high. Therefore, a large thrust can be applied to the moving lens body 3.

[Embodiment 6]
9A, 9B, 9C, and 9D are a plan view, a longitudinal sectional view, and a magnet view of a magnetic circuit used in the lens driving mechanism of the lens driving device according to Embodiment 6 of the present invention. It is explanatory drawing and explanatory drawing of the modification.

  As shown in FIGS. 9A, 9B, and 9C, in this embodiment as well, in the same manner as in the first embodiment, the lens driving mechanism 5 has an annular shape wound directly on the outer peripheral surface of the sleeve 15. A drive coil 14 and a linkage magnetic field generator 4 for generating a linkage magnetic field in the drive coil 14 are provided, and the drive coil 14 and the linkage magnetic field generator 4 constitute a magnetic circuit. The interlinkage magnetic field generator 4 includes a magnet 17 disposed on the outer peripheral side of the drive coil 14 and a back yoke 16 made of a ferromagnetic plate such as a steel plate. The back yoke 16 includes a cylindrical body portion 160 (cover portion) surrounding the drive coil 14, and a magnet 17 is fixed to the inner peripheral surface thereof.

  Similar to the first embodiment, the cylindrical body portion 160 of the back yoke 16 has a shape in which square corner portions 51, 52, 53, and 54 are chamfered. On the other hand, since the moving lens body 3 is a cylindrical body, the drive coil 14 is wound in an annular shape. For this reason, the width between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body 160 of the back yoke 16 is narrow in a region corresponding to a rectangular side, and the rectangular corners 51, 52, The area corresponding to 53 and 54 is wide. Therefore, also in this embodiment, the four magnets 17 are arranged separately from each of the corner portions 51, 52, 53, 54 of the cylindrical body portion 160 of the back yoke 16. In addition, all the four magnets 17 have an arc shape in which the inner surface conforms to the outer peripheral shape of the drive coil 14 in a plan view, while the outer surface has a shape along the inner peripheral surface of the cylindrical body 160 of the back yoke 16. have.

  In this embodiment, each of the four magnets 17 includes two magnet pieces 170 that are arranged so as to overlap in the direction of the lens optical axis X, and the drive coil 14 faces each of the plurality of magnet pieces 170. Two are arranged. Here, each of the two magnet pieces 170 is magnetized to a different pole in the inner and outer directions, and the two magnet pieces 170 have opposite magnetization directions in the inner and outer directions. Therefore, of the two magnet pieces 170, one magnet piece 170 has the south pole facing the drive coil 14, and the other magnet piece 170 has the south pole facing the drive coil 14.

  In the magnetic circuit configured as described above, the lines of magnetic force emitted from the two magnet pieces 170 are concentrated on the center side in the optical axis direction of the magnet 17 as schematically shown in FIG. In addition, since the magnetic lines of force from the two magnet pieces 170 wrap around in a narrow area, the leakage magnetic flux is small. Therefore, since the magnetic flux density interlinked with the drive coil 14 is high, a large thrust can be applied to the moving lens body 3.

  9B and 9C show an example in which two magnet pieces 170 are used, but three or more magnet pieces 170 may be arranged in the direction of the lens optical axis X. Good. Also in this case, the three or more magnet pieces 170 are magnetized to different poles in the inner and outer directions, and the magnetization directions in the inner and outer directions between the magnet pieces 170 adjacent in the direction of the lens optical axis X are also shown. Should be reversed.

  9 (b) and 9 (c) show an example using two magnet pieces 170. As shown in FIG. 9 (d), by applying a polarization magnet to one magnet 170, FIG. A magnetic pole may be arranged as shown in FIG. That is, the four magnets 17 have two magnetized regions arranged in the direction of the lens optical axis X, and the drive coil 14 has a direction of the lens optical axis X so as to face each of the two magnetized regions. Two are arranged. In the magnet 17, different polarities are formed in the inner and outer directions in each of the two magnetized areas, and the magnetization directions in the inner and outer directions are reversed between adjacent magnetized areas in the direction of the lens optical axis X. It has become. If such a configuration is adopted, even with one magnet 17, the magnetic flux density interlinking with the drive coil 14 can be increased, so that a large thrust can be applied to the moving lens body 3.

  When the configuration shown in FIG. 9C is compared with the configuration shown in FIG. 9D, an unstable region is generated in the boundary region of the magnetic poles in which the configuration shown in FIG. 9C is different. Therefore, there is an advantage that the magnetic flux density interlinking with the drive coil 14 can be increased.

[Embodiment 7]
FIG. 10 is an explanatory diagram of the urging member used in the lens driving device according to Embodiment 7 of the present invention. In the first to sixth embodiments, the moving lens body 3 is used as an urging member capable of exerting an urging force for holding the moving lens body 3 at a predetermined position in the optical axis direction regardless of whether the drive coil 14 is energized. The first plate spring 131 and the second plate spring 132 (spring member) for applying a mechanical biasing force to the first plate spring 131 are used. As shown in FIG. 10, the first plate spring 131 is used as the biasing member. In addition to the second plate spring 132, a ball-shaped, wire-shaped, or rod-shaped magnetic body 138 may be attached to the moving lens body 3. With this configuration, a magnetic urging force that acts between the magnetic body 138 and the magnet 17 can be applied to the moving lens body 3. When the magnetic body 138 is used as the urging member, one or both of the first leaf spring 131 and the second leaf spring 132 are omitted, and the urging member is configured by the magnetic body 138 alone. Also good.

[Embodiment 8]
FIGS. 11A and 11B are an external view and an exploded perspective view of a lens driving device according to Embodiment 8 of the present invention, respectively.

  11 (a) and 11 (b), the lens driving device 10 of the present embodiment also has three lenses 121, 122, 123 and a fixed stop 124 on the cylindrical lens holder 12 as in the first embodiment. The moving lens body 3 held integrally with the lens, the lens driving mechanism 5 for moving the moving lens body 3 along the lens optical axis X, and the fixed body 2 on which the lens driving mechanism 5 and the moving lens body 3 are mounted. Have.

  In the present embodiment, the fixed body 2 includes a base 19 for holding an image sensor (not shown) on the image side, and a case 11 located on the subject side. A circular incident window 110 for taking the reflected light into the lens is formed. The fixed body 2 includes a back yoke 16 sandwiched between the base 19 and the case 11, and the cylindrical body portion 160 of the back yoke 16 functions as a cover portion surrounding the magnet 17. Together with the magnet 17, a linkage magnetic field generator for generating a linkage magnetic field in the drive coil 14 is constituted. Here, the imaging element side end of the cylindrical body 160 of the back yoke 16 is bonded and fixed to the base 19, and the subject side end of the cylindrical body 160 of the back yoke 16 is bonded and fixed to the case 11. .

  In the present embodiment, the fixed body 2 includes a metal thin plate cover 18 that is placed on the subject side with respect to the case 11, and a circular incident window 180 is also formed in the thin plate cover 18. Further, the thin plate-like cover 18 includes a pair of engagement leg portions 181 extending from two opposite sides toward the base 19, and a hole 182 formed in the lower end portion of the engagement leg portion 181 extends from the side surface of the base 19. A protruding protrusion 192 is fitted. Further, the lower end of the engaging leg 181 and the protrusion 192 are also fixed by an adhesive.

  When the lens driving device 10 configured as described above is viewed from the optical axis direction, the cylindrical body portion 160 of the back yoke 16 has a shape in which square corner portions are chamfered. Further, the base 19, the case 11, and the thin plate-like cover 18 also have a shape in which a square corner portion is chamfered, and the size is the same as the cylindrical body portion 160 of the back yoke 16. Therefore, the outer peripheral shape of the cylindrical body 160, the base 19, the case 11, and the thin plate cover 18 of the back yoke 16 defines the outer peripheral shape of the lens driving device 10.

  In the moving lens body 3, since the sleeve 15 is a cylindrical body, the drive coil 14 is wound in an annular shape. On the other hand, the inner peripheral shape of the cylindrical body portion 160 of the back yoke 16 is different from the outer peripheral shape of the drive coil 14 and is non-circular (in this embodiment, a polygon). For this reason, between the outer peripheral surface of the drive coil 14 and the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16, the width is narrow in a region corresponding to a square side, and in a region corresponding to a corner of the quadrangle. The width is wide. Therefore, in this embodiment, the four magnets 17 are arranged separately from each of the corners of the cylindrical body 160 of the back yoke 16. In addition, all of the four magnets 17 have an arc shape in which the inner surface conforms to the outer peripheral shape of the drive coil 14 in a plan view, while the outer surface has a shape along the inner peripheral surface of the corner portion of the cylindrical body portion 160. have.

  In this embodiment, the moving lens body 3, the fixed body 2, and the urging member capable of exerting the urging force that holds the moving lens body 3 at a predetermined position in the optical axis direction regardless of whether or not the drive coil 14 is energized. And a first plate spring 131 and a second plate spring 132 (spring member) that are arranged between the two and apply a mechanical biasing force to the movable lens body 3. In this embodiment, a ball-shaped, wire-shaped, or rod-shaped magnetic body 138 held by the moving lens body 3 is used as the biasing member, and a magnetic force acting between the magnetic body 138 and the magnet 17 is used. The biasing force is applied to the moving lens body 3.

  In this embodiment, when the moving lens body 3 is held by the magnetic body 138, the upper end surface of the moving lens body 3 stores a plurality of magnetic bodies 138 at positions corresponding to the four corners of the cylindrical body 160. A possible recess 158 is formed. In addition, the upper case 11 is formed with a notch 118 that opens an upper portion of the two concave portions 158 out of the four concave portions 158.

  When manufacturing such a lens driving device 1, first, the magnetic body 138 is attached to each of the four recesses 158 before covering the upper case 11, and then bonded and fixed. Cover the case 11. In this state, the driving state and inclination of the movable lens body 3 are inspected, and based on the inspection result, the magnetic body 138 is added from the notch 118 of the upper case 11 to the two concave portions 158 located diagonally. After that, it is bonded and fixed, and the driving state and inclination of the moving lens body 3 are adjusted. And after finishing this adjustment, if the thin plate-shaped cover 18 is covered, the recessed part 138 can be covered. Further, if the thin plate-shaped cover 18 covers the gap exposed above the upper case 11, foreign matter can be prevented from entering the lens driving device 1, and the reliability of the lens driving device 1 can be improved.

  In this embodiment, when engaging the engaging leg 181 of the thin plate cover 18 with the base 19, the hole 182 formed in the lower end of the engaging leg 181 is formed, and the protrusion 192 is formed on the side surface of the base 19. However, a structure may be adopted in which the lower end side of the engagement leg 181 is protruded inward and the lower end side of the engagement leg 181 is fitted into the recess formed on the side surface of the base 19. Further, a structure in which the lower end side of the engagement leg 181 protrudes inward and the lower end side of the engagement leg 181 is slid and fitted into a groove formed on the side surface of the base 19 may be employed.

[Other embodiments]
In the above first to eighth embodiments, the cylindrical body portion 160 of the back yoke 16 is regarded as a shape in which the square corner portions 51, 52, 53, and 54 are chamfered, but the cylindrical body portion 160 of the back yoke 16. May be regarded as an octagon. In this case, each of the magnets 17 is disposed at a position including two corner portions of the corner portions of the cylindrical body portion 160 of the back yoke 16. The space between the peripheral surface and the outer peripheral surface of the drive coil 14 can be effectively used as an arrangement space for the magnet 17 and the dead space can be reduced.

  In the first to eighth embodiments, an example in which the moving lens body 3 is cylindrical and the shape of the cylindrical body 160 of the back yoke 16 (the shape of the lens driving device 10) is a polygon has been described. Even when the movable lens body 3 has a substantially rectangular tube shape and the cylindrical body portion 160 of the back yoke 16 has a circular shape (the shape of the lens driving device 10), the outer peripheral surface of the drive coil 14 and the cylindrical shape of the back yoke 16 are also present. A narrow region and a wide region are formed between the inner peripheral surface of the trunk portion 160. Even in such a case, if the magnet 17 is arranged along the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16 in a wide area, the inner peripheral surface of the cylindrical body portion 160 of the back yoke 16. And the outer peripheral surface of the drive coil 14 can be effectively used as an arrangement space for the magnet 17 and the dead space can be reduced.

  Further, in the first to fourth embodiments, the cover portion is formed by the cylindrical body portion 160 of the back yoke 16, but the cover portion is formed by the cylindrical body portion formed on the base 19 or the case 11. The present invention may be applied to such cases.

(A), (b) is the external view of the lens drive device which concerns on Embodiment 1 of this invention, respectively, and a disassembled perspective view. It is sectional drawing when the lens drive device shown in FIG. 1 is cut | disconnected along a lens optical axis. (A), (b), (c) is the top view of a magnetic circuit used for the lens drive mechanism of the lens drive device shown in FIG. 1, a longitudinal cross-sectional view, and explanatory drawing of a magnet. It is explanatory drawing which shows the lens drive operation | movement with the lens drive device shown in FIG. (A), (b), (c) is the top view of the magnetic circuit used for the lens drive mechanism of the lens drive device based on Embodiment 2 of this invention, a longitudinal cross-sectional view, and explanatory drawing of a magnet. (A), (b), (c) is the top view of a magnetic circuit used for the lens drive mechanism of the lens drive device concerning Embodiment 3 of this invention, a longitudinal cross-sectional view, and explanatory drawing of a magnet. (A), (b), (c) is the top view of a magnetic circuit used for the lens drive mechanism of the lens drive device based on Embodiment 4 of this invention, a longitudinal cross-sectional view, and explanatory drawing of a magnet. (A), (b), (c) is the top view of a magnetic circuit used for the lens drive mechanism of the lens drive device based on Embodiment 5 of this invention, a longitudinal cross-sectional view, and explanatory drawing of a coil yoke. (A), (b), (c), (d) are a plan view, a longitudinal sectional view, a magnet, and a deformation of the magnetic circuit used in the lens driving mechanism of the lens driving device according to Embodiment 6 of the present invention. It is explanatory drawing of an example. It is explanatory drawing of the biasing member used with the lens drive device which concerns on Embodiment 7 of this invention. (A), (b) is respectively the external view and exploded perspective view of the lens drive device concerning Embodiment 8 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Fixed body 3 Moving lens body 4 Interlinkage magnetic field generator 5 Lens drive mechanism 11 Case 12 Lens holder 14 Drive coil 15 Sleeve 16 Back yoke 17 Magnet 18 Thin plate cover 19 Base 131, 132 Leaf spring (biasing) Element)
138 Magnetic body (biasing member)
160 Cylindrical body of the back yoke (cover)
161 Inner yoke portion 162 Inner yoke 165 Coil yoke 170 Magnet piece 181 Engaging leg portion

Claims (22)

A moving lens body provided with a lens, a driving coil wound around the outer periphery of the moving lens body, a magnet for generating an interlinkage magnetic field in the driving coil, and the moving lens body and around the magnet In a lens driving device having a fixed body with a surrounding cover portion,
When viewed from the optical axis direction, the inner peripheral shape of the cover part is non-circular,
The lens driving device according to claim 1, wherein the magnet is disposed along an inner peripheral surface of the cover portion. A moving lens body provided with a lens, a driving coil wound around the outer periphery of the moving lens body, a magnet for generating an interlinkage magnetic field in the driving coil, and the moving lens body and around the magnet In a lens driving device having a fixed body with a surrounding cover portion,
When viewed from the optical axis direction, the inner peripheral shape of the cover part and the outer peripheral shape of the drive coil are different,
The lens driving device according to claim 1, wherein the magnet is disposed along an inner peripheral surface of the cover portion.   3. The lens driving device according to claim 1, wherein a plurality of the magnets are spaced apart from each other at a plurality of locations in the circumferential direction. In any of claims 1 to 3,
The drive coil is wound in an annular shape,
The inner peripheral shape of the cover part is a polygon,
The lens driving device according to claim 1, wherein the magnet is disposed at a position including at least one corner portion among a plurality of corner portions of the inner peripheral shape of the cover portion. In any of claims 1 to 3,
The drive coil is wound in an annular shape,
The inner peripheral shape of the cover part is a quadrangle, or a polygon with chamfered corners of the quadrangle,
The lens driving device according to claim 1, wherein the magnet is disposed at a corner portion of the square. In any of claims 1 to 5,
The cover portion is a cylindrical body portion of a back yoke,
The lens driving device, wherein the magnet is fixed to an inner peripheral surface of the cylindrical body portion of the back yoke. In claim 6,
The lens drive device according to claim 1, wherein the back yoke includes an inner yoke portion extending from the cylindrical body portion to an inner position of the drive coil. In claim 6,
A lens driving device characterized in that a coil yoke is arranged on the side opposite to the side where the magnet is located for the driving coil. In any of claims 6 to 8,
The lens driving device according to claim 1, wherein the magnet is disposed on an outer peripheral side of the driving coil. In claim 9,
The lens driving device according to claim 1, wherein the magnet is disposed so that an inner surface thereof follows an outer peripheral shape of the driving coil. In claim 9 or 10,
The lens driving device according to claim 1, wherein the magnet is magnetized to different poles in the inner and outer directions. In claim 9 or 10,
The magnet includes two magnet pieces magnetized to different poles in the optical axis direction,
The two magnet pieces are arranged to overlap in the optical axis direction so that the same poles are in contact with each other. In claim 9 or 10,
The magnet includes a plurality of magnet pieces arranged to overlap in the optical axis direction, and a plurality of the drive coils are arranged in the optical axis direction to face each of the plurality of magnet pieces,
The plurality of magnet pieces are each magnetized to a different pole in the inner and outer directions, and the magnetizing directions in the inner and outer directions between adjacent magnet pieces in the optical axis direction are opposite to each other. apparatus. In claim 9 or 10,
The magnet includes a plurality of divided magnetization regions arranged in the optical axis direction, and a plurality of the drive coils are arranged in the optical axis direction to face each of the plurality of divided magnetization regions,
Each of the plurality of divided magnetization regions is magnetized to different poles in the inner and outer directions, and the magnetization directions in the inner and outer directions are opposite between the adjacent magnetization regions in the optical axis direction. A lens driving device. In any of claims 6 to 14,
The fixed body includes a base disposed on the imaging element side in the optical axis direction with respect to the cylindrical body portion of the back yoke, and imaging in the optical axis direction with respect to the cylindrical body portion of the back yoke. With a case placed on the element side,
When viewed from the optical axis direction, the back yoke, the base, and the case have substantially the same outer peripheral shape.   16. The lens driving device according to claim 15, wherein the fixed body includes a plate-like cover that covers the case on the subject side.   The lens driving device according to claim 16, wherein the plate-like cover extends toward the base and an engagement leg portion that engages with the base extends. In any one of Claims 1 thru | or 17,
A lens driving device comprising an urging member capable of exerting an urging force for holding the movable lens body at a predetermined position in the optical axis direction regardless of whether or not the drive coil is energized. In claim 18,
The lens driving device according to claim 1, wherein the urging member includes a spring member that is disposed between the moving lens body and the fixed body and applies a mechanical urging force to the moving lens body. In claim 18 or 19,
The urging member includes a magnetic body that is disposed on the moving lens body and applies a magnetic urging force generated between the urging member and the magnet to the moving lens body. .   21. The lens driving device according to claim 20, wherein the moving lens body can change the number of magnetic bodies that can be mounted and the size of the magnetic body that can be mounted.   The lens driving device according to claim 1, wherein the driving coil is wound directly around the moving lens body.

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