JP2008139811A - Lens driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device that excels in vibration resistance and in the impact resistance, in a direction of intersecting the direction of the optical axis, tilt direction, and so on, even in a narrow space around a movable lens body. <P>SOLUTION: In the lens driving device 10, of the spring members 31 and 32 supporting the movable lens body 3, a spring member 32 includes a rectangular outer frame part 321 connected to a support body; a circular inner frame 322 connected to the movable lens body 3; and a plurality of arms 323, connecting the inner frame part 322 and outer frame part 321. The arms 323 extend in areas, corresponding to the corners of at least the outer frame part 321, in an area sandwiched between the outer frame part 321 and inner frame part 322. <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.

  2. Description of the Related Art In recent years, camera-equipped mobile phones equipped with cameras and digital cameras have become widespread, and cameras mounted on such portable devices have a lens driving device that drives the lens to be displaced in the optical axis direction. . As such a lens driving device, a movable lens body provided with a lens, a support body that supports the movable lens body so as to be movable in the optical axis direction via a spring member, and the movable lens body is driven in the optical axis direction. The spring member includes an annular outer frame portion connected to the support, an annular inner frame portion connected to the moving lens body, an inner frame portion, and an outer frame. What is provided with the three arm parts which connect a part is used (refer patent document 1, 2).

In such a spring member, the arm portion extends in the circumferential direction between the outer frame portion and the inner frame portion to exhibit a spring property, and enables movement of the movable lens body in the optical axis direction. In addition, the portable device has many opportunities to receive vibrations and impacts due to the nature of being carried, but such vibrations and impacts are absorbed by the arm portion.
JP 2006-128392 A JP 2006-201525 A

  Here, the inventor of the present application proposes a spring member that can cope with the case where the moving lens body is surrounded by a rectangular tube portion, such as the outer shape of the lens driving device being a rectangular parallelepiped. In such a case, for example, the outer frame portion connected to the support body is formed in a rectangular shape, and the inner frame portion connected to the moving lens body is formed in an annular shape in the spring member. As a result, the spring member has a problem that the space between the side portion of the outer frame portion and the inner frame portion is narrow, and the degree of freedom in designing the shape of the arm portion and the like is low. For this reason, the spring member cannot secure a sufficient spring property, and further, the moving lens body moves violently in the direction intersecting the optical axis direction or the tilt direction due to a strong impact such as a drop impact in the lens driving device. In such a case, the spring member is likely to be plastically deformed or broken, and there is a problem that a defect such as a stroke defect is likely to occur in the lens driving device.

  In view of the above problems, an object of the present invention is to provide a lens driving device having excellent vibration resistance and shock resistance in the direction intersecting the optical axis direction and in the tilt direction even when there is only a narrow gap around the moving lens body. Is to provide.

  In order to solve the above problems, in the present invention, a cylindrical moving lens body provided with a lens, a support body that supports the moving lens body so as to be movable in the optical axis direction via a spring member, and the moving lens In the lens driving device having a magnetic driving mechanism for driving the body in the optical axis direction, the support includes a square tube portion surrounding the moving lens body with a predetermined gap, and the spring member includes An outer connecting portion connected to the support, an inner connecting portion connected to the moving lens body, and a plurality of arm portions that connect the inner connecting portion and the outer connecting portion; Of the region sandwiched between the movable lens body and the rectangular tube portion, the region extends at least in a region corresponding to the corner portion of the rectangular tube portion.

  In the present invention, even when the support is provided with a rectangular tube portion surrounding the moving lens body so as to correspond to the outer shape of the lens driving device, it is sandwiched between the moving lens body and the rectangular tube portion. Since the arm portion is extended by effectively using the region corresponding to the corner portion of the rectangular tube portion, sufficient spring property can be given to the arm portion, and the moving lens body is in the optical axis direction. It is possible to configure an arm portion that is less likely to be plastically deformed or broken when it is moved violently in a direction intersecting with or tilted. Therefore, even when the cylindrical moving lens body is surrounded by a square tube portion and there is only a narrow gap around the moving lens body, vibration resistance and shock resistance in the direction crossing the optical axis direction and in the tilt direction It is possible to provide a lens driving device with excellent performance.

  In this invention, it is preferable that the said support body is provided with the square cylinder-shaped back yoke with respect to the said magnetic drive mechanism as the said square cylinder part. If comprised in this way, the side surface of a lens drive device can be comprised by a back yoke, and the circumference | surroundings of a moving lens body can be used effectively.

  In the present invention, each of the plurality of arm portions meanders including a plurality of portions curved and / or bent in a radial direction in an in-plane direction orthogonal to the optical axis direction in a region corresponding to a corner portion of the rectangular tube portion. It is preferable to provide the part. If comprised in this way, the location which exhibits a spring property in an arm part can be increased. In addition, since the force applied to the arm portion can be dispersed, vibration in the tilt direction of the movable lens body can be efficiently suppressed. Furthermore, even when there is only a narrow gap around the moving lens body, an arm portion having a sufficient length can be configured.

  In this invention, it is preferable that the said inner side connection part and the said outer side connection part are wider than the width dimension of the said meandering part. If comprised in this way, even if a big load is added to an inner side connection part and an outer side connection part, it will not be damaged. In addition, when the inner connecting portion is formed wide, stress when the moving lens body moves in a direction intersecting the optical axis direction or tilted obliquely with respect to the optical axis is applied to the arm portion. It is possible to efficiently absorb the stress when the moving lens body moves in a direction intersecting the optical axis direction or tilted in an oblique direction with respect to the optical axis.

  In the present invention, it is preferable that a width dimension of the outer connecting portion is continuously narrowed from the outer connecting portion toward the meandering portion. If comprised in this way, even if a big load is added to an outer side connection part, an arm part will not be damaged.

  In the present invention, it is preferable that a width dimension of the inner connecting portion is continuously narrowed from the inner connecting portion toward the meandering portion. If comprised in this way, even if a big load is added to an inner side connection part, an arm part will not be damaged.

  In the present invention, in the arm portion, the outer connecting portion connected to the outer connecting portion and the inner connecting portion connected to the inner connecting portion are different from each other by 45 ° or more in the angle direction when viewed from the center position of the inner connecting portion. It is preferable that it is located in a location. Furthermore, in the arm portion, the connecting portion with the outer connecting portion and the connecting portion with the inner connecting portion are located at different positions by 60 ° or more in the angular direction centered on the inner connecting portion. The lens driving device according to claim 1, wherein the lens driving device is a lens driving device. With this configuration, even when there is only a narrow gap around the moving lens body, an arm portion having a sufficient length can be configured.

  In the present invention, the rectangular tube portion is, for example, a rectangular tube shape.

  In the present invention, a configuration in which the outer connecting portion has a rectangular frame shape surrounding the inner connecting portion can be adopted. Moreover, in this invention, the structure by which the said connection part for fixation is divided | segmented into plurality can also be employ | adopted.

  In the present invention, it is possible to adopt a configuration in which the plurality of arm portions include two arm portions arranged at both side positions sandwiching the center position of the inner connecting portion.

  In this case, in the two arm portions, the extended lines of the inner connecting portions are parallel to each other on the region side sandwiching the central position of the inner connecting portion, or shifted from the central position of the inner connecting portion. It is preferable to extend in the crossing direction.

  In the present invention, each of the two arm portions is arranged point-symmetrically around the center of the inner connecting portion, and each of the two arm portions is parallel to a side portion of the rectangular tube portion. It is preferable that the spring member extends to the inner connecting portion across a virtual line that bisects the spring member. If comprised in this way, since the length dimension of an arm part can be lengthened, even when there are restrictions, such as a narrow space between the side part of a square tube part, and an inner side connection part, the spring property of an arm part is improved. be able to.

  In the present invention, when the arm portion is composed of two, the first spring member and the second spring member having substantially the same shape of the arm portion at two positions spaced apart in the optical axis direction. It is preferable that the first spring member and the second spring member are arranged in a direction in which the angular position is shifted by 90 °. With this configuration, the moving lens body can be supported with springiness in all directions, so that it is possible to avoid a situation such as inferior vibration resistance or impact resistance in a direction intersecting the optical axis direction or in a tilt direction. Can do.

  In the present invention, it is preferable that the plurality of arm portions are arranged in a rotationally symmetrical manner with a substantially identical shape and centering on the center of the inner connecting portion. In the present invention, “the arm portion is rotationally symmetric” means that when one arm portion is rotated by a predetermined angle with respect to the rotation center, it overlaps with the other arm portion, and the rotation angle is 180 degrees. The case is point symmetric. If comprised in this way, even if an arm part deform | transforms when a movable lens body moves to an optical axis direction, all the arm parts will deform | transform similarly. Accordingly, since there is only a narrow gap around the moving lens body, the moving lens body does not tilt even if the shape of the arm portion is restricted. Further, when the moving lens body moves in the optical axis direction, it is possible to adopt a configuration in which the moving lens body is rotated in the circumferential direction within a range where the aberration of the lens does not become a problem.

  In the present invention, a moving lens body provided with a lens, a support body that supports the moving lens body so as to be movable in the optical axis direction via a spring member, and a magnetic drive mechanism that drives the moving lens body in the optical axis direction The spring member includes an outer connecting portion connected to the support, an inner connecting portion connected to the moving lens body, and the inner connecting portion and the outer connecting portion. A plurality of arm portions connected to each other, each of the plurality of arm portions including a meandering portion including a plurality of portions bent in the radial direction in the in-plane direction orthogonal to the optical axis direction and / or a plurality of bent portions. The arm portions are arranged in a rotationally symmetric manner around the center of the inner connecting portion with substantially the same shape.

  In the present invention, since the plurality of arm portions are arranged in a rotationally symmetrical manner with the substantially same shape as the center of the inner connecting portion, the arm portions are moved when the movable lens body moves in the optical axis direction. Even when deformed, all the arm portions are similarly deformed. Accordingly, since there is only a narrow gap around the moving lens body, the moving lens body does not tilt even if the shape of the arm portion is restricted. Further, when the moving lens body moves in the optical axis direction, it is possible to adopt a configuration in which the moving lens body is rotated in the circumferential direction within a range in which the aberration of the lens does not become a problem. Since it has a curved shape and / or a bent shape in the radial direction, interference or the like does not occur in the meandering portion even when there is only a narrow gap around the moving lens body.

  In the lens driving device of the present invention, the moving lens body and the square tube can be used even in the case where the support is provided with a square tube portion surrounding the moving lens body so as to correspond to the outer shape of the lens driving device. Since the arm portion is extended by effectively utilizing a wide region corresponding to the corner portion of the rectangular tube portion among the regions sandwiched between the portions, the arm portion can be provided with sufficient spring property, and the moving lens When the body moves violently in the direction intersecting the optical axis direction or in the tilt direction, it is possible to configure an arm portion that is less likely to undergo plastic deformation or breakage. Therefore, even in the case where the cylindrical moving lens body is surrounded by a square tube portion and there is only a narrow gap around the moving lens body, vibration resistance and anti-vibration characteristics such as the direction crossing the optical axis direction and the tilt direction are included. It is possible to provide a lens driving device having excellent impact properties.

  Further, in the present invention, since the plurality of arm portions are arranged in a rotationally symmetrical manner with the substantially same shape and centered on the center of the inner connecting portion, the arm portion is moved when the moving lens body moves in the optical axis direction. Even when is deformed, all the arm portions are similarly deformed. Accordingly, since there is only a narrow gap around the moving lens body, the moving lens body does not tilt even if the shape of the arm portion is restricted. Further, when the moving lens body moves in the optical axis direction, it is possible to adopt a configuration in which the moving lens body is rotated in the circumferential direction within a range in which the aberration of the lens does not become a problem. In the case of having a curved shape and / or a bent shape in the radial direction, interference or the like does not occur in the meandering portion even when there is only a narrow gap around the moving lens body.

  A lens driving device to which the present invention is applied will be described below 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 thin digital camera, PHS, PDA, bar code reader, surveillance camera, camera for checking the back of a car, a door having an optical authentication function, and the like.

(overall structure)
1A, 1B, and 1C are respectively an external view, an exploded perspective view, and a side view of a lens driving device to which the present invention is applied as seen from obliquely above. 2A and 2B are cross-sectional views when the lens driving device is cut in the optical axis direction at positions corresponding to the FF ′ line and the GG ′ line in FIG. 1A, respectively. . In FIG. 2B, illustration of a lens, a lens holder, and the like is omitted.

  1A, 1B, 2C, and 2A, 2B, the lens driving device 10 according to the present embodiment is a thin camera used for a camera-equipped mobile phone or the like. The lenses 121, 122, and 123 are moved along the optical axis direction L in both directions of A direction (front side) approaching the subject (object side) and B direction (rear side) approaching the opposite side (image side) of the subject. It has a rectangular parallelepiped shape. The lens driving device 10 generally includes a substantially cylindrical moving lens body 3 in which three lenses 121, 122, 123 and a fixed diaphragm 124 are integrally held on a cylindrical lens holder 12, and the moving lens body 3. It has a lens drive mechanism 5 that moves along the optical axis direction L, and a support 2 on which the lens drive mechanism 5 and the moving lens body 3 are mounted. The moving lens body 3 includes a cylindrical sleeve 15, and a cylindrical lens holder 12 is fixed to the inside thereof.

  In this embodiment, the support 2 has a rectangular base 19 for holding an image sensor (not shown) on the image side, a rectangular case 11 located on the subject side, and a plate shape that covers the subject side of the case 11. In the center of the case 11 and the plate-like cover 18, circular incident windows 110 and 180 for taking reflected light from the subject into the lens are formed, respectively. The support 2 further includes a square cylindrical back yoke 16 (square tube portion) sandwiched between the base 19 and the case 11, and the back yoke 16, together with a drive magnet 17, which will be described later, is a drive coil. 141 and 142 constitute a linkage magnetic field generator 4 for generating a linkage magnetic field. Here, the back yoke 16 is disposed so as to surround the movable lens body 3.

  The lens driving mechanism 5 includes a polygonal cylindrical first driving coil 141 and a second driving coil 142 disposed on the outer peripheral surface of the sleeve 15, and a linkage magnetic field generation that generates a linkage magnetic field in the drive coils 141 and 142. The magnetic drive mechanism 5a is configured by the drive coils 141 and 142 and the interlinkage magnetic field generator 4. The interlinkage magnetic field generator 4 includes four drive magnets 17 disposed between the drive coils 141 and 142, and a rectangular tube-shaped back yoke 16 made of a ferromagnetic plate such as a steel plate. Each of the magnets 17 is fixed to four corners of the inner peripheral surface of the back yoke 16. Here, all the four drive magnets 17 are magnetized to poles having different inner and outer surfaces. For example, all of the four drive magnets 17 are magnetized with an N pole on the inner surface and an S pole on the outer surface. In this embodiment, the drive coils 141 and 142 and the drive magnet 17 are opposed to each other in the optical axis direction L. However, the drive coils 141 and 142 and the drive magnet 17 are in the radial direction (direction intersecting the optical axis direction). In some cases, the opposite configuration may be adopted. In this case, instead of the two drive coils 141 and 142, one drive coil may be used, and as the magnet 17, two magnet pieces may be arranged so as to overlap in the optical axis direction L.

  The back yoke 16 is sandwiched between the base 19 and the case 11, and the back yoke 16 is exposed on the side surface of the lens driving device 10 and constitutes a side surface portion thereof. For this reason, the space around the moving lens body 3 can be used effectively.

  The lens driving mechanism 5 further includes a first spring member 31 sandwiched between the back yoke 16 and the base 19 and a second spring sandwiched between the back yoke 16 and the case 11. A member 32 is provided. Here, both the first spring member 31 and the second spring member 32 are plate springs formed from a thin metal plate made of beryllium copper or the like, and have the same thickness in the optical axis direction. Productivity is high. The thicknesses of the first spring member 31 and the second spring member 32 in the optical axis direction may be changed for convenience. Moreover, although the material which comprises the 1st spring member 31 and the 2nd spring member 32 differs mutually, the structure which makes thickness the same may be employ | adopted.

  Here, the distance between the opposed surfaces of the drive coils 141 and 142 is larger than the dimension of the drive magnet 17 in the optical axis direction L. For this reason, there is a gap in the optical axis direction L between the drive magnet 17 and the first drive coil 141 and between the drive magnet 17 and the second drive coil 142, and the movement is performed within the range of the gap. The lens body 3 can move in the optical axis direction L.

  The back yoke 16 is formed such that the length in the optical axis direction L is longer than the distance between the opposing surfaces of the drive coils 141 and 142. For this reason, the leakage magnetic flux from the magnetic path formed between the drive magnet 17 and the first drive coil 141 and the magnetic path formed between the drive magnet 17 and the second drive coil 142 is reduced. The linearity between the amount of movement of the sleeve 15 and the current flowing through the drive coils 141 and 142 can be improved. Therefore, in the back yoke 16 of this embodiment, for example, the effect of reducing the above-described leakage magnetic flux can be obtained without forming the shape of the back yoke 16 so as to cover the side surfaces and the lower surface or the upper surface of the drive coils 141 and 142. be able to.

  The lens driving device 10 is formed with terminals 318a and 318b for the drive coils 141 and 142, and the configurations of the terminals 318a and 318b will be described later together with the configurations of the first spring member 31 and the second spring member 32. .

(Detailed configuration of sleeve 15)
3A, 3B, and 3C are a plan view, a JJ ′ sectional view, and a KK ′ sectional view of the sleeve 15, respectively. As shown in FIGS. 1B, 2A and 3A, the sleeve 15 has a substantially cylindrical shape, and the outer peripheral surface of the sleeve 15 has a large diameter in the vicinity of the substantially center in the optical axis direction L. A portion 150 is formed. Further, as shown in FIGS. 2B, 3B, and 3C, a rectangular flange portion 156 is formed at the image sensor side end portion of the sleeve 15, and is formed at four locations in the circumferential direction. Have corners. Further, as shown in FIGS. 2B, 3A, 3B, and 3C, a rectangular flange portion 157 is formed at the subject side end of the sleeve 15 in the circumferential direction. In four places, corners 157a, 157b, 157c, and 157d having substantially trapezoidal shapes protrude.

  In this embodiment, when the drive coils 141 and 142 are fixed to the sleeve 15, as shown in FIGS. 2 (A) and 2 (B) and FIGS. 3 (A), (B), and (C), a substantially rectangular shape is obtained. The second drive coil 142 wound around the drive coil bobbin (not shown) is fixed to the outer peripheral surface of the flange portion 157 so that the corner portion is positioned on the outer peripheral side of the corner portions 157a, 157b, 157c, 157d. To do. At this time, the end face on the imaging element side of the second drive coil 142 is brought into contact with the subject-side end face of the large diameter portion 150. Further, the first drive coil 141 wound around a substantially square drive coil bobbin (not shown) is placed on the outer peripheral surface of the flange portion 156 so that the corner portion is positioned on the outer peripheral side of the corner portion of the flange portion 156. Fix it. At that time, the end surface on the subject side of the first drive coil 141 is brought into contact with the end surface on the imaging element side of the large diameter portion 150.

  In the sleeve 15, of the corner portions 157a, 157b, 157c, and 157d, the corner portions 157a and 157c projecting in a trapezoidal shape on the diagonal line are formed with thick portions 158a and 158c on the outer peripheral side, and are thicker. Inside the portions 158a and 158c, magnetic piece holding holes 159a and 159c that are opened on the subject side are formed. A magnetic piece 138 described later is held in the magnetic piece holding holes 159a and 159c.

  The corners 157b and 157d projecting in a trapezoidal shape on the other diagonal of the sleeve 15 project in a columnar shape on the outer peripheral side of the sleeve 15 further toward the subject side than the subject side end surface of the sleeve 15 (the subject side end surface of the moving lens body 3). Thick portions 158b and 158d are formed, and magnetic piece holding holes 159b and 159d opened on the subject side are formed inside the thick portions 158b and 158d. A magnetic piece 138 described later is held in the magnetic piece holding holes 159b and 159d.

  In this embodiment, the drive coils 141 and 142 are supplied with power via the first spring member 31 as will be described in detail later. That is, the drive coil 141 is connected to the first spring member 31 as it is, while the drive coil 142 is a groove-shaped guide portion 154 formed near the corner portion 157a of the sleeve 15 (see FIG. 3A). And is connected to the first spring member 31. Further, the coil ends of the drive coils 141 and 142 are connected to each other, and the connected portions are accommodated in the groove-shaped guide portion 154 of the sleeve 15.

(Configuration of case 11)
4 is a plan view of the case 11. As shown in FIGS. 1A, 1B, and 4, the case 11 has a rectangular flat plate shape, and an incident window 110 is formed near the center. . In the case 11, step portions 111 a and 111 c are formed on one of the pair of diagonal lines so as to extend along the incident window 110.

  In the case 11, notches 112 b and 112 d are formed on the other diagonal line from the entrance window 110 toward the outside in the radial direction. The notches 112b and 112d are constituted by recesses 113b and 113d that are deeply recessed in a trapezoidal shape radially outward from the entrance window 110, and shallow notches 114b and 114d that extend in the circumferential direction with respect to the recesses 113b and 113d. . The recesses 113b and 113d have a trapezoidal shape like the corners 157b and 157d described with reference to FIGS. 3A and 3C. However, the recesses 113b and 113d are formed by the corners 157b and 157d. Is also formed slightly larger.

(Configuration of the plate cover 18)
5A and 5B are a plan view and a side view of the plate-like cover 18, respectively. As shown in FIGS. 1 (A), (B), 2 (A), (B) and FIGS. 5 (A), (B), the plate cover 18 is formed of a nonmagnetic thin plate (for example, SUS304). And a substantially rectangular top plate portion 185 covering the subject side of the case 11 and a pair of engaging leg portions 181 extending from a pair of opposing side portions of the top plate portion 185. An incident window 180 is formed at the center of the top plate portion 185, and a notch 186 is formed at a position overlapping the step portions 111a and 111c of the case 11 described with reference to FIG.

  The engagement leg 181 is formed with an engagement through hole 181a in the vicinity of the lower end thereof. On the other hand, as shown in FIGS. 1A and 1B, an engagement protrusion 191 is formed on the side surface of the base 19. Accordingly, with the base 19, the spring member 31, the back yoke 16, the spring member 32, and the case 11 overlapped, the plate cover 18 is overlapped on the subject side with respect to the case 11, and the engagement protrusion 191 of the base 19 is engaged. The plate-like cover 18 can be fixed to the base 19 by fitting in the through hole 181a.

(Configuration of stopper mechanism)
6A and 6B are a perspective view and a plan view of a first stopper mechanism configured in the lens driving device to which the present invention is applied, respectively. In the assembled state of the lens driving device 10, as shown in FIGS. 6A and 6B, the corners 157b and 157d of the planar trapezoidal shape of the sleeve 15 (the moving lens body 3) are planar trapezoidal shapes of the case 11. The inside of the recesses 113b and 113d. In this state, the outer peripheral surfaces of the corner portions 157b and 157d of the sleeve 15 are opposed to the inner peripheral surfaces of the concave portions 113b and 113d of the case 11 through the gap x on the radially inner side. Further, the outer peripheral surfaces of the corner portions 157b and 157d of the sleeve 15 are opposed to the inner peripheral surfaces of the concave portions 113b and 113d of the case 11 with a gap y in the circumferential direction. In this way, when the moving lens body 3 is displaced in the direction (radial direction and circumferential direction) intersecting the optical axis direction L, the stopper mechanism 101 that restricts the displacement is configured.

(Operation)
In the lens driving device 10 of the present embodiment, the moving lens body 3 is normally located on the image sensor side (image side) as shown in FIG. 2A or 2B. Specifically, the lower end surface (image side surface) of the sleeve 15 is in contact with the upper surface (front side surface) of the base 19.

  In such a state, when a current in a predetermined direction is passed through the drive coils 141 and 142, the drive coils 141 and 142 receive an upward (front) electromagnetic force, respectively. As a result, the sleeve 15 to which the drive coils 141 and 142 are fixed starts to move toward the subject side (front side). At this time, an elastic force that restricts the movement of the sleeve 15 is generated between the spring member 31 and the front end of the sleeve 15 and between the spring member 32 and the rear end of the sleeve 15. For this reason, when the electromagnetic force that moves the sleeve 15 forward and the elastic force that restricts the movement of the sleeve 15 are balanced, the sleeve 15 stops. Further, when a reverse current is passed through the drive coils 141 and 142, the drive coils 141 and 142 receive a downward (rear) electromagnetic force, respectively.

  At this time, the sleeve 15 (moving lens body 3) can be stopped at a desired position by adjusting the amount of current flowing through the drive coils 141 and 142 and the elastic force acting on the sleeve 15 by the spring members 31 and 32. it can. Further, since the urging force of the magnetic piece 138 held by the moving lens body 3 and the driving magnet 17 is also used, the magnetic driving mechanism 5a for generating a propulsive force in the optical axis direction L on the moving lens body 3 can be reduced. Can be planned.

  In this embodiment, since the spring members 31 and 32 in which a linear relationship is established between the elastic force (stress) and the displacement amount (strain amount) are used, the movement amount of the sleeve 15 and the drive coils 141 and 142 are used. It is possible to improve the linearity between the current flowing in the capacitor. In addition, since two elastic members such as the spring members 31 and 32 are used, a large balance force is applied in the optical axis direction L when the sleeve 15 is stopped. Even if another force such as an impact force is applied, the sleeve 15 can be stopped more stably. Further, in the lens driving device 10, the sleeve 15 is not stopped by colliding with a collision material (buffer material) or the like, but is stopped using a balance between electromagnetic force and elastic force. Therefore, it is possible to prevent the occurrence of a collision sound.

  Furthermore, in this embodiment, the moving lens body 3 is supported by the support body 2 via the spring members 31 and 32, and the moving lens body 3 may be displaced in a direction crossing the optical axis direction L when an impact is applied. However, between the moving lens body 3 and the support body 2 (case 11), a stopper mechanism that restricts displacement of the moving lens body 3 in a direction (radial direction and circumferential direction) intersecting the optical axis direction L. Since 101 is configured, even when an impact is applied to the moving lens body 3 in a direction crossing the optical axis direction, the moving lens body 3 is not greatly displaced. Therefore, since the spring members 31 and 32 are not deformed to a state where the shape cannot be restored, the spring members 31 and 32 function normally thereafter. Further, even when an impact is applied to the moving lens body 3 in the direction intersecting the optical axis direction L, the moving lens body 3 is not greatly displaced, so that the drive coils 141 and 142 collide with other members to be disconnected or short-circuited. It is possible to prevent the occurrence of problems such as. Therefore, according to the present invention, the impact resistance in the direction intersecting the optical axis direction L can be improved in the lens driving device 10.

  Further, the stopper mechanism 101 includes corner portions 157b and 157d (projections) projecting in the radial direction from the moving lens body 3, and concave portions 113b and 113d that receive the corner portions 157b and 157d on the inner side. The stopper mechanism 101 can be configured with a simple configuration. In addition, since the corners 157b and 157d and the recesses 113b and 113d all have a trapezoidal shape (polygonal shape), even when an impact is applied to the moving lens body 3 in a direction intersecting the optical axis direction L, The corners 157b and 157d and the recesses 113b and 113d interfere with each other over a relatively large area, so that they operate reliably and the stopper mechanism 101 is not damaged.

  Furthermore, since the corners 157b and 157d are formed on the moving lens body 3 and the recesses 113b and 113d are formed on the support 2 (case 11) side, the thickness of the moving lens body 3 can be reduced. In other words, when the concave portion is formed in the moving lens body 3, the design restriction is increased, for example, the outer peripheral wall of the moving lens body 3 needs to be thickened. Since the (corner portions 157b and 157d) are provided, such a design restriction does not occur.

  Furthermore, the corners 157b and 157d are provided with thick portions 158b and 158d projecting in a columnar shape from the subject side end surface of the moving lens body 3 to the subject side, and the recesses 113b and 113d are formed in the case 11, so The dimension in the optical axis direction L of the portion (corner portions 157b, 157d) and the recesses 113b, 113 can be increased. Therefore, even when the moving lens body 3 is moved to any position in the optical axis direction L, when an impact is applied to the moving lens body 3 in the direction intersecting the optical axis direction L, the protrusion (corner portion) 157b, 157d) and the recesses 113b, 113 reliably interfere with each other, and the displacement of the movable lens body 3 can be regulated.

  Furthermore, the stopper mechanism 101 (corner portions 157b, 157d and recesses 113b, 113) is exposed on the subject-side surface of the case 11, but is covered with the plate cover 18, so that the lens driving device 10 looks good. Can be improved. Further, the plate cover 18 can prevent foreign matter from entering the lens driving device 10.

  Furthermore, the moving lens body 3 has magnetic piece holding holes 159a and 159b for holding the magnetic piece 138 for applying an urging force in the optical axis direction L to the moving lens body 3 by an attractive force acting between the driving magnet 17 and the moving lens body 3. 159c, 159d are formed, and among these magnetic piece holding holes 159a, 159b, 159c, 159d, the magnetic piece holding holes 159a, 159c are covered with the case 11, while the magnetic piece holding holes 159b, 159d are covered with the case 11 Is exposed on the subject side. For this reason, the magnetic piece holding holes 159b and 159d can be used as urging force correcting magnetic piece holding portions that can change the number and size of the magnetic pieces 138 even after the case 11 is covered. Even in this case, the magnetic piece holding holes 159b and 159d (the biasing force correcting magnetic piece holding portions) are formed in the corner portions 157b and 157d used in the stopper mechanism 101 and are covered with the plate cover 18, so that the lens driving device is provided. The appearance of 10 can be improved. Further, the plate cover 18 can prevent foreign matter from entering the lens driving device 10.

  Furthermore, since the corners 157b and 157d (projections) protruding in the radial direction from the moving lens body 3 are accommodated in the recesses 113b and 113d, the lens driving device can be used to increase the effective length of the corners 157b and 157d. 10 can be made thin.

  In this embodiment, the corners 157b and 157d and the recesses 113b and 113d are each formed in a trapezoidal shape (polygonal shape), but may be formed in a semicircular shape. Further, the lower ends of the corner portions 157b and 157d may be extended outward in the radial direction, and the extended portions may be embedded in the edges of the recesses 113b and 113d of the case 11. If comprised in this way, the extended part and the edge of case 11 will overlap when it sees from the optical axis direction L, and will oppose through a predetermined clearance gap in the optical axis direction L. Therefore, when the impact in the optical axis direction L is applied to the moving lens body 3, a stopper mechanism that restricts the moving range of the moving lens body 3 toward the subject side can be configured. Therefore, since the displacement of the moving lens body 3 in the optical axis direction L can be prevented before the spring members 31 and 32 are excessively deformed, the spring members 31 and 32 function normally thereafter. Even when an impact in the optical axis direction L is applied to the moving lens body 3, the moving lens body 3 is not greatly displaced, so that the drive coils 141, 142 and the drive magnet 17 are opposed to each other in the optical axis direction L. Even in this case, it is possible to prevent the occurrence of problems such that the drive coils 141 and 142 collide with the drive magnet 17 and are disconnected or short-circuited. Therefore, the impact resistance in the optical axis direction L can be improved in the lens driving device 10.

(Power feeding structure to the drive coils 141 and 142)
7A and 7B are perspective views showing a state in which the spring members 31 and 32 are connected to the sleeve 15 as viewed from the subject side and the image sensor side, respectively. FIGS. 8A and 8B are schematic views illustrating the connection method of the drive coil to the spring member to which the present invention is applied.

  As shown in FIGS. 7A and 7B, in the lens driving device 10 of the present embodiment, a first spring member 31 and a second spring member 32 are provided at the upper and lower ends of the sleeve 15 (moving lens body 3). Connected. Each of the spring members 31 and 32 has a function of supporting the movable lens body 3 so as to be displaceable in the optical axis direction and preventing the rotation of the movable lens body 3 around the optical axis.

  Here, the first spring member 31 and the second spring member 32 are formed in substantially the same shape, but the first spring member 31 and the second spring member 32 are angular positions shifted by 90 °. It is arranged toward the.

  In the present embodiment, the entire second spring member 32 is integrally formed. On the other hand, the first spring member 31 includes two electrically separated spring pieces 31a and 31b, and terminals 318a and 318b are formed on the spring pieces 31a and 31b, respectively. Therefore, as shown in FIGS. 8A and 8B, when the coil terminals of the drive coils 141 and 142 are electrically connected to the spring pieces 31a and 31b, the drive coils 141 and 142 are connected via the terminals 318a and 318b. Can be powered.

  Specifically, for example, as shown in FIG. 8A, the winding start wire 141a drawn from the inner peripheral side of the drive coil 141 is soldered to a coil connection portion 317a formed on the spring piece 31a. The winding end wire 142b drawn from the outer peripheral side of the drive coil 142 is soldered to the coil connection portion 317b formed on the spring piece 31b. Further, the winding end line 141 b drawn from the outer peripheral side of the drive coil 141 and the winding start line 142 a drawn from the inner peripheral side of the drive coil 142 are connected. At that time, the winding end line 142b of the drive coil 142 is guided to the spring piece 31b through the groove-shaped guide portion 154 formed in the vicinity of the corner portion 157a of the sleeve 15 shown in FIG. The connecting portion 140 between the end wire 141b and the winding start wire 142a of the drive coil 142 is also stored in the groove-shaped guide portion 154. If comprised in this way, while being able to connect the drive coils 141 and 142 in series, the winding direction of the drive coils 141 and 142 can be arrange | equalized.

  As shown in FIG. 8B, the winding end wire 141b drawn from the outer peripheral side of the drive coil 141 is soldered to the coil connection part 317a formed on the spring piece 31a, while the outer peripheral side of the drive coil 142 The winding end wire 142b that is further drawn out may be soldered to the coil connection portion 317b formed in the spring piece 31b. In this case, the winding start line 141a drawn from the inner peripheral side of the drive coil 141 and the winding start line 142a drawn from the inner peripheral side of the drive coil 142 are connected. Also in this case, the winding end line 142b of the drive coil 142 is guided to the spring piece 31b through the groove-shaped guide portion 154 formed in the vicinity of the corner portion 157a of the sleeve 15 shown in FIG. The connecting portion 140 between the winding start wire 141 a and the winding start wire 142 a of the drive coil 142 is also stored in the groove-shaped guide portion 154. If comprised in this way, the drive coils 141 and 142 can be connected in series. However, the winding directions of the drive coils 141 and 142 are reversed.

  Of the coil ends pulled out from the drive coils 141 and 142, when the coil end pulled out at a position away from the first spring member 131 is drawn around the spring piece 31b, it is formed in the second spring member 142. You may pass through the opening.

(Detailed configuration of the second spring member 32)
FIG. 9 is a plan view of the second spring member 32 used in the lens driving device to which the present invention is applied. As shown in FIG. 9, the second spring member 32 includes a rectangular outer frame portion 321 (outer coupling portion) sandwiched between the back yoke 16 and the case 11 and held by the support body 2, and the sleeve 15. An annular inner frame portion 322 (inner coupling portion) connected to the upper end of the inner frame portion, and two arm portions 323 that couple the inner frame portion 322 and the outer frame portion 321. The two arm portions 323 are configured to be point-symmetric about the center C2 (optical axis) of the inner frame portion 322, and each arm portion 323 is between the inner frame portion 322 and the outer frame portion 321. In the region corresponding to the corner portion of the outer frame portion 321 (hereinafter, corner portion 325), the meandering portion 323f provided with a plurality of curved portions 323e that are folded back in the radial direction within the plane orthogonal to the optical axis direction L. The arm portion 323 extends in the circumferential direction while meandering without being largely folded back in the circumferential direction. Here, in each of the two arm portions 323, the connection portion (outer frame connection portion 323 a) with the outer frame portion 321 is positioned on the side portion of the outer frame portion 321, and the center C <b> 2 of the inner frame portion 322 is defined. It is in a point-symmetrical position with the center. Further, the two arm portions 323 both extend in parallel with the side portion connected to the outer frame portion 321 and straddle the virtual bisector L2 passing through the center C2 (optical axis) of the inner frame portion 322. And connected to the inner frame portion 322.

  Further, in the two arm portions 323, the connection portion (inner frame connection portion 323b) with the inner frame portion 322 is parallel to the bisector L2 and deviated from the bisector L2 (preferably Are 323b on both sides of L2). Furthermore, the extension line of the inner frame connecting portion 323b of the two arm portions 323 is shifted from the center C2 of the inner frame portion 322. Further, the width of the arm portion 323 changes in the length direction, for example, the arm portion 323 is wide in the vicinity of the outer frame connection portion 323a, the inner frame connection portion 323b, or the like. Moreover, in the outer frame connection part 323a and the inner frame connection part 323b, the width dimension is continuously narrowed toward the meandering part 323f.

  In this way, in the two arm portions 323, the outer frame connecting portion 323a and the inner frame connecting portion 323b have an angle direction of 45 ° or more, further 60 ° or more, as viewed from the center position of the inner frame portion 322. Then, the arm portion 323 extends at about 70 °. The two arm portions 323 have substantially the same shape and are rotationally symmetric about the center of the inner frame portion 322. In this embodiment, the outer frame connecting portion 323a and the inner frame connecting portion 323b are largely shifted from the center position of the inner frame portion 322, but the two arm portions 323 are configured not to overlap in the radial direction. It is.

  Note that holes 324 into which the protrusions 16a of the back yoke 16 shown in FIG. 2B are fitted are formed at four corners of the outer frame portion 321 of the second spring member 32. Further, the inner frame portion 322 of the second spring member 32 is formed with a notch 326 into which the small protrusion 152 of the sleeve 15 shown in FIG.

(Detailed configuration of the first spring member 31)
FIGS. 10A and 10B are plan views showing the configuration before and after the division of the first spring member 31 used in the lens driving device to which the present invention is applied. As shown in FIG. 10B, the first spring member 31 is divided into two spring pieces 31a and 31b. When the spring pieces 31a and 31b are combined, the first spring member 31 is substantially the same as the second spring member 32. It has a shape. That is, the first spring member 31 includes an annular inner frame portion 311 held between the back yoke 16 and the base 19 and held by the support 2 and an annular inner portion connected to the lower end of the sleeve 15. A frame portion 312 and two arm portions 313 that connect the inner frame portion 312 and the outer frame portion 311 are provided. The two arm portions 313 are configured symmetrically with respect to the center position C1 (optical axis) of the inner frame portion 312, and any of the arm portions 313 is formed between the inner frame portion 312 and the outer frame portion 311. Among the intervening regions, a plurality of curves that fold back in a radial direction within a plane orthogonal to the optical axis direction L in a region (hereinafter, corner portion 315) corresponding to a corner portion of the outer frame portion 311 (corner portion of the back yoke 16). It extends with a meandering part 313f provided with a part 313e. Here, in each of the two arm portions 313, the connection portion with the outer frame portion 311 (outer frame connection portion 313 a) is located on the side portion of the outer frame portion 311, and the center position C 1 of the inner frame portion 312. Is in a point-symmetric position with respect to. Each of the two arm portions 313 has a virtual bisector L1 extending in parallel with the side portion connected to the outer frame portion 311 and passing through the center position C1 (optical axis) of the inner frame portion 312. It is connected to the inner frame portion 312 across the bridge.

  Further, in the two arm portions 313, the connection portion (inner frame connection portion 313b) with the inner frame portion 312 is parallel to the side portion of the outer frame portion 311 at both sides of the bisector L1, that is, second order. It extends parallel to the dividing line L1, and the extension line of the inner frame connecting portion 313b of the two arm portions 313 is shifted from the center position C1 of the inner frame portion 312. Further, the width of the arm portion 313 changes in the length direction, for example, the arm portion 313 is wide in the vicinity of the outer frame connection portion 313a, the inner frame connection portion 313b, or the like. Further, in the outer frame connecting portion 313a and the inner frame connecting portion 313b, the width dimension is continuously narrowed toward the meandering portion 313f.

  In this way, in the two arm portions 313, the outer frame connecting portion 313 a and the inner frame connecting portion 313 b are 45 ° or more in angle direction, further 60 ° or more, as viewed from the center position C 1 of the inner frame portion 312. In the form, the arm portion 313 extends at about 70 °. The two arm portions 313 have substantially the same shape and are rotationally symmetrical about the center of the inner frame portion 312. In addition, since the first spring member 31 and the second spring member 32 are arranged in the same direction and with an angular position shifted by 90 °, the two arm portions 313 of the first spring member 31; The two arm portions 323 of the second spring member 32 are formed to be rotationally symmetric about the centers of the inner frame portions 312 and 323. In this embodiment, the outer frame connecting portion 313a and the inner frame connecting portion 313b are largely shifted from the center position of the inner frame portion 312, but the two arm portions 313 are configured not to overlap in the radial direction. It is.

  Note that a small hole 316 into which the small protrusion 151 of the sleeve 15 shown in FIG. 7B is fitted is formed in the inner frame portion 312 of the first spring member 31. In the first spring member 31, the inner frame portion 312 of each of the spring pieces 31 a and 31 b protrudes to the outer peripheral side, and the coil terminals shown in FIGS. 8A and 8B are connected by solder. Coil connection portions 317a and 317b are formed. Further, in the first spring member 31, terminals 318a and 318b bent at a right angle on the outer peripheral side are formed on the outer frame portions 311 of the spring pieces 31a and 31b, respectively.

  As shown in FIG. 10 (A), the first spring member 31 having such a configuration includes the lens driving device 10 in a state of a spring member constituting member 310 in which spring pieces 31a and 32b are integrally formed in a lead frame shape. Used for assembly. In the spring member constituting member 310, portions corresponding to the end portions of the terminals 318a and 318b are connected to the U-shaped connecting portion 310a via the constricted portion 318c. For this reason, the connection part 310a can be cut off only by bending at the constricted part 318c. Further, on the side opposite to the terminals 318a and 318b, the outer frame portion 311 is connected to the U-shaped connecting portion 310b via the constricted portion 311c. For this reason, the connection part 310b can be cut off only by bending at the constricted part 311c. Furthermore, the end portions of the inner frame portion 312 are connected to two connecting portions 310c extending radially inward via a constricted portion 312c. Here, the front ends of the two connecting portions 310c are divided through slits, and the connecting portions 310c can be separated simply by bending the two connecting portions 310c separately at the constricted portion 312c. Accordingly, a separation mark remains at the ends of the spring pieces 31a and 32b.

(Assembly method)
In order to assemble the lens driving device 10 using such a member, after the movable lens body 3 is arranged inside the back yoke 16, a spring member constituting member 310 (first spring member 31) and an insulating material (not shown) are provided. The back yoke 16 and the base 19 are fixed with an adhesive or the like. Next, the connecting portions 310a, 310b, and 310c are bent at the constricted portions 311c, 312c, and 318c of the spring member constituting member 310 to disconnect the connecting portions 310a, 310b, and 310c. As a result, the first spring member 31 is divided into two spring pieces 31a and 31b. Next, the terminals 318a and 318b are bent downward. The connecting portions 310a, 310b, and 310c may be separated by mechanical cutting, laser fusing, or the like.

  Next, the end portions of the drive coils 141 and 142 are soldered to the coil connection portions 317a and 317b formed on the spring pieces 31a and 31b.

  When such an assembly is performed, in the moving lens body 3 (sleeve 15), the magnetic piece holding holes 159a, 159b, 159c, and 159d opened on the subject side are each provided with a spherical, wire-shaped or rod-shaped magnetic piece 138. Attach them one by one and fix them with an adhesive.

  Next, the back yoke 16 and the case 11 are fixed with an adhesive or the like with the second spring member 32 and an insulating material (not shown) interposed therebetween. In this state, of the magnetic piece holding holes 159a, 159b, 159c, and 159d, the entire corner portions 157a and 157c including the magnetic piece holding holes 159a and 159c are covered with the case 11. However, the magnetic piece holding holes 159b and 159d are exposed on the surface on the subject side by the cutout portions of the spring member 32 and the cutouts 112b and 112d of the case 11.

  In this state, the drive coils 141 and 142 are energized to drive the moving lens body 3, and the inclination of the moving lens body 3 and the current value (starting current) necessary to start the moving lens body 3 are corrected. That is, if there is a problem with the tilt of the movable lens body 3, a spherical, wire-like or rod-like magnetic piece 138 is added to one or both of the magnetic piece holding holes 159 b and 159 d, or the magnetic piece 138 is used. The lens is replaced with one having a different size, and the inclination of the moving lens body 3 is corrected. In addition, by adding the magnetic piece 138 or replacing the magnetic piece 138 with a different size, the current value (starting current) necessary to start the movable lens body 3 can be adjusted. If such a configuration is not adopted, the magnetic piece 138 once incorporated in the lens driving device 10 cannot be replaced with another one, and the urging force applied to the moving lens body 3 by the magnetic piece 138 is not appropriate. In some cases, the lens driving device 10 was a work-in-process loss. However, according to the present embodiment, the magnetic piece 138 can be easily replaced even after inspection in a state close to the finished product. It is possible to prevent loss.

  Next, the plate cover 18 is overlapped on the subject side with respect to the case 11, and the engagement protrusion 191 of the base 19 is fitted into the engagement through hole 181 a to fix the plate cover 18 to the base 19. In this state, the entire corners 157b and 157d of the sleeve 15 such as the magnetic piece holding holes 159b and 159d, and the notches 112b and 112d of the case 11 are covered with the plate cover 18.

(Main effects of this form)
As described above, in this embodiment, even when the rectangular spring members 31 and 32 are used corresponding to the outer shape of the lens driving device 10 and the shape of the lens driving device 5, the rectangular outer frame portion 311, Of the region sandwiched between the outer frame portion 311 and the annular inner frame portions 312 and 322, a wide region corresponding to the corner portions 315 and 325 of the outer frame portions 311 and 321 (corner portions of the back yoke 16) is effectively used. The arm portions 313 and 323 are extended. For this reason, sufficient spring properties can be imparted to the arm portions 313, 323, and plastic deformation or breakage can occur when the movable lens body 3 moves violently in the direction intersecting the optical axis direction L or in the tilt direction. The arm portions 313 and 323 that are not easily generated can be configured. In other words, the arm portions 313 and 323 have an outer frame out of a region sandwiched between the outer frame portions 311 and 321 and the inner frame portions 312 and 322 (region sandwiched between the moving lens body 3 and the back yoke 16). It can be made into the shape provided with the some curved part 313e, 323e curved to a radial direction in the wide area | region equivalent to the corner | angular part 315,325 of the part 311,321 (corner part of the back yoke 16). Therefore, even when the spring members 31 and 32 are deformed by an external force, the stress applied to the meandering portions 313f and 323f is dispersed, so that the strength of the arm portions 313 and 323 can be increased. Therefore, when the outer frame portions 311 and 321 employ the rectangular spring members 31 and 32, even when vibration or impact in the direction intersecting the optical axis direction of the moving lens body 3 or in the tilt direction is applied, the spring member 31 is used. , 32 does not undergo plastic deformation or breakage. Therefore, it is possible to configure the lens driving device 10 having excellent vibration resistance and impact resistance in the direction intersecting the optical axis direction L and in the tilt direction, and further resistance to twisting of the moving lens body 3.

  In addition, the two arm portions 313 of the first spring member 31 and the two arm portions 323 of the second spring member 32 are formed rotationally symmetric around the center of the inner frame portions 312 and 323, Both extend in the same circumferential direction. Accordingly, even when the arm portions 313 and 323 are deformed when the movable lens body 3 is moved in the optical axis direction L, all the arm portions 313 and 323 are similarly deformed. Therefore, since there is only a narrow gap around the moving lens body 3, the moving lens body 3 does not tilt even if the shape of the arm portions 313 and 323 is restricted. In addition, in the present embodiment, the meandering portions 313f and 323f have a curved shape and / or a bent shape in the radial direction, so even when there is only a narrow gap around the moving lens body 3, the meandering portion 313f, Problems such as interference at 323f do not occur.

  Further, in each of the two arm portions 313 and 323, the inner frame connection portions 313b and 323b connected to the inner frame portions 312 and 322 have their extension lines extending from the center positions C1 and C2 of the inner frame portions 312 and 322, respectively. They extend in parallel to each other on the sandwiched region side. For this reason, since the portions where the arm portions 313 and 323 impart spring properties to the moving lens body 3 can be dispersed in a plane orthogonal to the optical axis direction L, vibration of the moving lens body 3 in the tilt direction is efficiently performed. It can be suppressed well. From this point of view, a configuration in which the extension lines of the inner frame connecting portions 313b and 323b intersect at positions avoiding the center positions C1 and C2 of the inner frame portions 312 and 322 may be adopted.

  Further, the two arm portions 313 and 323 extend over virtual bisectors L1 and L2 passing through the centers of the inner frame portions 312 and 322, respectively, and the arm portions 313 and 323 are long. Even when there is a restriction such as a narrow space between the side portions of the portions 311 and 321 and the inner frame portions 312 and 322, the spring property can be improved. Therefore, in the arm portions 313 and 323, the outer frame connecting portions 313a and 323a and the inner frame connecting portions 313b and 323b are at an angle of 45 ° or more when viewed from the center positions C1 and C2 of the inner frame portions 312 and 322. The arm portions 313 and 323 can be extended with a sufficient number of curved portions 313e and 323e (meandering portions 313f and 323f) between them.

  Further, the two spring members 31 and 32 have substantially the same shape, but are arranged in an orientation in which the angular position is shifted by 90 °, so that the movable lens body 3 is supported with springiness in all directions. Can do. Therefore, it is possible to avoid such a situation that vibration resistance and impact resistance are inferior in a specific direction. From the viewpoint of supporting the movable lens body 3 with springiness in all directions, depending on the number and shape of the arm portions 313 and 323, the shift of the angular position of the two spring members 31 and 32 is 90 °. It is not limited.

  Furthermore, the widths of the arm portions 313 and 323 change in the length direction, such as the vicinity of the outer frame connection portions 313a and 323a and the width of the inner frame connection portions 313b and 323b. Further, in the outer frame connecting portion 323a and the inner frame connecting portion 323b, the width dimension is continuously narrowed toward the meandering portion. For this reason, it is possible to avoid a situation in which the moving lens body 3 resonates and is greatly displaced, and a situation in which stress concentrates on specific portions of the arm portions 313 and 323. From this point of view, the thicknesses of the arm portions 313 and 323 may be changed in the length direction.

[Other embodiments]
FIGS. 11A and 11B are enlarged views showing the shape of the meandering portion of the spring member in other embodiments. FIGS. 12A, 12B, and 12C are configuration diagrams showing the shapes of the arm portions of the spring members in other embodiments, respectively.

  As shown in FIGS. 11A and 11B, the shape of the meandering portion formed by the plurality of curved portions 313e and 323e of the spring members 31 and 32 is an arbitrary shape within a range not departing from the present invention. be able to. For example, as shown in FIG. 11A, the shape may be such that the meandering curve is stretched. Further, as shown in FIG. 11B, the number of times of bending may be increased.

  Further, as shown in FIGS. 12A, 12B, and 12C, in the spring member 32, the shape of the two arm portions 323 can be any shape without departing from the present invention. . For example, in the above embodiment, the meandering portion is formed on the side close to the outer frame connecting portion 323a. However, as shown in FIG. 12A, the meandering portion may be formed on the side close to the inner frame connecting portion 323b. Good. As shown in FIG. 12B, one extension line of the inner frame connecting portion 323b passes through the center position C2 of the inner frame portion 322, and the other extension line is a position avoiding the center position C2. You may comprise as follows. Furthermore, as shown in FIG. 12C, if the respective extension lines in the inner frame connecting portion 323b extend in parallel with each other on the side of the region sandwiching the center position C2 of the inner frame portion 322, the outer frame connecting portion 323a. One of the extended lines may be parallel to the extended line of the inner frame connecting portion 323b and the other may intersect at an angle other than 90 °. Although not shown in the drawing, both the extension lines of the outer frame connection part 323a are parallel to the extension line of the inner frame connection part 323b, or an angle other than 90 ° with respect to the extension line of the inner frame connection part 323b. You may comprise so that it may cross | interpose. In addition, the structure demonstrated using said FIG. 12 (A), (B), (C) is applicable also to the arm part 313 which the spring member 31 has.

  In the above embodiment, the spring members 31 and 32 including the two arm portions 313 and 323 are used. However, as shown in FIGS. 13A and 13B, the spring members 31 and 32 include four arm portions. 313 and 323 may be provided. Also in this case, the structure of each arm part 313,323 is the same as that of the said form. For example, when comparing two arm portions 313 and 323 arranged on both sides of the center positions C1 and C2 of the inner frame portions 312 and 322 among the four arm portions 313 and 323, the outer frame portion 321 and The connecting portion (outer frame connecting portion 323a) is located on the side of the outer frame portion 321 and is in a point-symmetrical position with the center C2 of the inner frame portion 322 as the center. Further, the two arm portions 323 both extend in parallel with the side portion connected to the outer frame portion 321 and straddle the virtual bisector L2 passing through the center C2 (optical axis) of the inner frame portion 322. And connected to the inner frame portion 322. Further, any of the arm portions 313 and 323 is a region (corner portion 315, 325) includes meandering portions 313f and 323f including a plurality of bending portions 313e and 323e that are folded back in the radial direction within a plane orthogonal to the optical axis direction L, and the arm portions 313 and 323 are largely folded back in the circumferential direction. It extends in the circumferential direction while meandering. Further, the two arm portions 313 of the first spring member 31 and the two arm portions 323 of the second spring member 32 are formed rotationally symmetrically around the center of the inner frame portions 312 and 323, Both extend in the same circumferential direction. Further, in the arm portions 313 and 323, the outer frame connecting portions 313a and 323a and the inner frame connecting portions 313b and 323b are at an angle of 45 ° or more, and 60 in view of the center positions C1 and C2 of the inner frame portions 312 and 322. The arm portions 313 and 323 extend with a sufficient number of curved portions 313e and 323e (meandering portions 313f and 323f) between them. Since other configurations are the same as those in the above embodiment, common portions are denoted by the same reference numerals, and detailed description thereof is omitted.

  Furthermore, in the above embodiment, the spring members 31 and 32 in which the outer connecting portions connected to the support body 2 are rectangular frame-shaped outer frame portions 311 and 321 are used, but the outer connecting portions are divided into a plurality of parts. A configuration in which the arm portions 313 and 323 are coupled to the plurality of divided outer coupling portions may be employed.

  In addition, in the said form, what was divided | segmented as the drive magnet 17 was used, However, You may use the integral drive magnet 17. FIG. Moreover, in the said form, although two drive coils were used, you may use one drive coil. Conversely, two drive magnets may be used for one drive coil. Furthermore, in the above embodiment, the drive magnet 17 and the drive coils 141 and 142 are opposed to each other in the optical axis direction L. However, the drive coils 141 and 142 are fixed to the outer peripheral side of the sleeve 15, and the drive magnet 17 is connected to the drive coils 141 and 142. 142 may be fixed to the back yoke 16 so as to face the outer peripheral side. Further, if the interlinkage magnetic field can be generated in the direction perpendicular to the optical axis with respect to the drive coils 141 and 142, the drive magnet 17 is configured to be magnetized in the axial direction and configured to be magnetized in the radial direction. Any of these may be adopted. Further, the drive magnet of the drive magnet and the drive coil may be fixed to the sleeve 15. Moreover, in the said form, the plate-shaped cover 18 may be comprised with a magnetic body, and the structure which can coat | cover the case 11, the back yoke 16, and the whole side surface of the base 19 with the plate-shaped cover 18 may be employ | adopted. By comprising in this way, the plate-shaped cover 18 can be functioned as a shielding material. Further, in the plate-like cover 18, a configuration in which a portion covering the side surface of the back yoke 16 is formed of a magnetic material may be employed. With this configuration, the plate cover 18 can function as an auxiliary back yoke for promoting the magnetism of the drive magnet 17. Furthermore, in the above embodiment, when configuring the stopper mechanism 101 (first stopper mechanism), the moving lens body 3 is provided with a protrusion and the support body 2 is provided with a recess. The stopper mechanism 101 (first stopper mechanism) may be configured by providing a recessed portion that is recessed and a protrusion that enters the recessed portion on the support. Furthermore, in the above embodiment, four magnetic piece holding holes are provided in the moving lens body 3, but a configuration in which one magnetic piece holding hole is provided may be adopted. Furthermore, you may use a ring-shaped thing as a magnetic piece.

(A), (B), and (C) are the external view, the exploded perspective view, and the side view which looked at the front of the lens drive device to which this invention was applied from diagonally upward. (A), (B) is sectional drawing when a lens drive device is cut | disconnected in the optical axis direction in the position corresponded to the FF 'line and GG' line | wire in FIG. 1 (A), respectively. (A), (B), and (C) are a plan view, a JJ ′ sectional view, and a KK ′ sectional view of a sleeve used in the lens driving device to which the present invention is applied, respectively. It is a top view of the case used for the lens drive device to which the present invention is applied. (A) and (B) are respectively a plan view and a side view of a plate-like cover used in a lens driving device to which the present invention is applied. (A), (B) is the perspective view of the 1st stopper mechanism comprised in the lens drive device to which this invention is applied, respectively, and its top view. (A) and (B) are perspective views showing a state in which the first spring member and the second spring member are mounted on the sleeve as viewed from the subject side and the image sensor side in the lens driving device to which the present invention is applied. FIG. (A), (B) is a schematic diagram which each illustrates the connection method of the drive coil with respect to the spring member to which this invention is applied. It is a top view of the 2nd spring member used for the lens drive device to which the present invention is applied. (A), (B) is a top view which respectively shows the structure before dividing | segmenting the 1st spring member used for the lens drive device to which this invention is applied, and the structure after dividing | segmenting. (A), (B) is an enlarged view which respectively shows the shape of the meander part of the spring member in other embodiment. (A), (B), (C) is a block diagram which shows the shape of the arm part of the spring member in other embodiment, respectively. (A), (B) is a top view which shows the example which provided the four arm parts in the two spring members used for the lens drive device to which this invention is applied, respectively.

Explanation of symbols

2 Support body 3 Moving lens body 10 Lens drive device 15 Sleeve 16 Back yoke (square tube portion)
31, 32 Spring members 31a, 31b Spring pieces 141, 142 Drive coils 311, 321 Outer frame portion (outer coupling portion)
312 and 322 Inner frame (inner connecting part)
313, 323 Arm part

Claims (17)

A cylindrical moving lens body provided with a lens; a support body that supports the moving lens body so as to be movable in the optical axis direction via a spring member; and a magnetic drive mechanism that drives the moving lens body in the optical axis direction. In a lens driving device having
The support includes a square tube portion surrounding the movable lens body with a predetermined gap therebetween,
The spring member includes an outer connecting portion connected to the support, an inner connecting portion connected to the moving lens body, and a plurality of arm portions that connect the inner connecting portion and the outer connecting portion. ,
The arm portion extends at least in a region corresponding to a corner portion of the rectangular tube portion among regions sandwiched between the movable lens body and the rectangular tube portion.   The lens driving device according to claim 1, wherein the support body includes a rectangular tube-shaped back yoke with respect to the magnetic driving mechanism as the rectangular tube portion.   Each of the plurality of arm portions includes a meandering portion including a plurality of portions curved and / or bent in a radial direction in an in-plane direction orthogonal to the optical axis direction in a region corresponding to a corner portion of the rectangular tube portion. The lens driving device according to claim 1, wherein the lens driving device is provided.   The lens driving device according to claim 3, wherein the inner connection portion and the outer connection portion are wider than a width dimension of the meandering portion.   The lens driving device according to claim 4, wherein a width dimension of the outer connecting portion is continuously narrowed from the outer connecting portion toward the meandering portion.   6. The lens driving device according to claim 4, wherein a width dimension of the inner connecting portion is continuously narrowed from the inner connecting portion toward the meandering portion.   In the arm portion, the outer connecting portion connected to the outer connecting portion and the inner connecting portion connected to the inner connecting portion are located at different positions by 45 ° or more in the angular direction when viewed from the center position of the inner connecting portion. The lens driving device according to claim 1, wherein the lens driving device is a lens driving device.   In the arm portion, the connecting portion with the outer connecting portion and the connecting portion with the inner connecting portion are located at different positions by 60 ° or more in the angular direction centered on the inner connecting portion. The lens driving device according to any one of claims 1 to 6.   The lens driving device according to any one of claims 1 to 8, wherein the rectangular tube portion has a rectangular tube shape.   The lens driving device according to claim 1, wherein the outer connecting portion has a rectangular frame shape surrounding the inner connecting portion.   The lens driving device according to claim 1, wherein the fixing connecting portion is divided into a plurality of portions.   12. The lens according to claim 1, wherein the plurality of arm portions include two arm portions disposed at both side positions sandwiching a center position of the inner connecting portion. Drive device.   In the two arm portions, the extension lines of the inner connection portions intersect with each other on the region side sandwiching the center position of the inner connection portion or at positions shifted from the center position of the inner connection portion. The lens driving device according to claim 12, wherein the lens driving device extends in a direction. Each of the two arm portions is arranged point-symmetrically around the center of the inner connecting portion,
13. The two arm portions each extend parallel to a side portion of the rectangular tube portion and extend to the inner connecting portion across a virtual line that bisects the spring member. Or the lens drive device of 13. The arm part is two,
The spring member is arranged as a first spring member and a second spring member having substantially the same shape of the arm portion at two locations separated in the optical axis direction,
The lens driving device according to any one of claims 1 to 14, wherein the first spring member and the second spring member are arranged so that an angular position is shifted by 90 degrees.   The lens driving device according to any one of claims 1 to 15, wherein the plurality of arm portions are arranged in a rotationally symmetrical manner with a substantially identical shape and centering on a center of the inner connecting portion. . A lens having a moving lens body provided with a lens, a support that supports the moving lens body so as to be movable in the optical axis direction via a spring member, and a magnetic drive mechanism that drives the moving lens body in the optical axis direction In the drive device,
The spring member includes an outer connecting portion connected to the support, an inner connecting portion connected to the moving lens body, and a plurality of arm portions that connect the inner connecting portion and the outer connecting portion. ,
Each of the plurality of arm portions includes a meandering portion including a plurality of portions that are radially curved and / or bent in an in-plane direction orthogonal to the optical axis direction,
The lens driving device according to claim 1, wherein the plurality of arm portions have substantially the same shape and are arranged in rotational symmetry about the center of the inner coupling portion.

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