WO2010058637A1 - Dispositif d’actionnement de lentille et module de caméra dans lequel est monté ce dispositif d’actionnement de lentille - Google Patents

Dispositif d’actionnement de lentille et module de caméra dans lequel est monté ce dispositif d’actionnement de lentille Download PDF

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Publication number
WO2010058637A1
WO2010058637A1 PCT/JP2009/064462 JP2009064462W WO2010058637A1 WO 2010058637 A1 WO2010058637 A1 WO 2010058637A1 JP 2009064462 W JP2009064462 W JP 2009064462W WO 2010058637 A1 WO2010058637 A1 WO 2010058637A1
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WO
WIPO (PCT)
Prior art keywords
magnetic plate
driving device
lens
lens driving
magnetic
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Application number
PCT/JP2009/064462
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English (en)
Japanese (ja)
Inventor
三生 中島
博司 山下
裕麻 青井
哲 太田
Original Assignee
三洋電機株式会社
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Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2010058637A1 publication Critical patent/WO2010058637A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism

Definitions

  • the present invention includes a base having a substantially flat base, a holder for holding the lens, movable in the direction of the optical axis of the lens with respect to the base, and surrounding the lens from the radial direction of the lens.
  • a lens driving device including a plurality of fixed magnets, a case attached to the base and surrounding the holder, and a magnetic plate opposed to the plurality of magnets in the radial direction, and a camera module equipped with the lens driving device About.
  • a camera mounted on a mobile phone has been increased in the number of pixels and has become an essential function. Therefore, in order to perform autofocus of the camera, a lens driving device that moves the lens in the direction of the optical axis of the lens (hereinafter referred to as “optical axis direction”) is used in the camera.
  • optical axis direction a lens driving device that moves the lens in the direction of the optical axis of the lens
  • a voice coil type structure as in Patent Document 1 is adopted as a structure for driving the lens of the lens driving device.
  • This voice coil type structure is generally known to be able to reduce the size of the lens driving device because the structure can be simplified as compared with a structure using a stepping motor.
  • a coil is mounted on the holder holding the lens, a magnet is mounted on the base side, and the holder is moved in the optical axis direction by an electromagnetic driving force generated by applying a current to the coil. Has moved. Further, the holder is supported by a spring member, and the spring member is shared for power supply to the coil so that the wiring is not drawn from the holder.
  • a magnetic plate is disposed at a position facing the plurality of magnets and each magnet in the radial direction.
  • the present invention has been made in view of the above problems, and the object of the present invention is to maintain a constant radial distance between a plurality of magnets and each of the magnets and the magnetic bodies facing each other in the radial direction. Another object of the present invention is to provide a lens driving device that makes the magnetic forces between the magnets and the magnetic plate substantially equal to each other, and a camera module equipped with the lens driving device.
  • a first aspect of the present invention includes a base having a substantially flat base, a holder for holding the lens, and a holder movable in the direction of the optical axis of the lens with respect to the base. And surrounding the lens from the radial direction of the lens, a plurality of magnets fixed to the holder, a case attached to the base and surrounding the holder, and facing the plurality of magnets in the radial direction.
  • the lens driving device includes a magnetic plate, and at least one of the base and the case is provided with a positioning portion that determines the radial position of the magnetic plate.
  • the radial position of the magnetic plate is determined by providing the positioning portion on at least one of the base and the case, the radial distance between the magnet and the magnetic plate is accurately set. can do. Accordingly, the radial distances between the plurality of magnets and the magnetic plates opposed to the respective magnets in the radial direction can be made substantially equal to each other. As a result, the magnetic force between each magnet and the magnetic plate can be made substantially equal to each other.
  • each of the base and the case is provided with the positioning portion, and the positioning portion is provided on the optical axis of the magnetic plate.
  • the gist is to contact both ends of the direction.
  • the magnetic plate can be prevented from being inclined with respect to the optical axis direction.
  • the gist of the lens driving device includes a coil that opposes the magnet in the radial direction and generates a magnetic field, and the magnetic plate is arranged in a radial direction with a gap in between the coil.
  • the magnetic plate is arranged with a gap in the radial direction with respect to the coil, so that the contact between the magnetic plate and the coil can be suppressed, which is caused by the contact between the magnetic plate and the coil.
  • the bending of the coil can be suppressed.
  • the magnetic plate can be accurately arranged with respect to the coil by the positioning part, the size of the radial gap between the magnetic plate and the coil can be set small. As a result, the lens drive device can be reduced in size in the radial direction.
  • the case extends in the direction of the optical axis and is attached to the base.
  • the gist is provided with a side plate, wherein the side plate is provided with a notch portion that opens in the radial direction and in which the magnetic plate is disposed.
  • the lens driving device can be reduced in the radial direction as compared with the structure in which the magnetic plate is not disposed in the notch. be able to.
  • the longitudinal width of the notch portion of the case is the longitudinal direction of the magnetic plate.
  • the gist is that it is approximately equal to the width of the direction.
  • the gap formed between the magnetic plate and the notch is reduced or eliminated. Can do. Therefore, it is possible to prevent dust from entering the case from the outside of the lens driving device through the gap. In addition, the position of the magnetic plate in the longitudinal direction relative to the case can be accurately determined by the notch.
  • the gist of the invention according to claim 6 is that, in the lens driving device according to claim 5, the space between the magnetic plate and the notch is sealed with an adhesive.
  • the magnetic plate can be fixed to the case by sealing the longitudinal direction between the magnetic plate and the cutout portion with the adhesive, and the magnetic plate and the cutout from the outside of the lens driving device. It is possible to more accurately suppress dust from entering the case through a gap formed between the first and second portions.
  • the length of the cutout portion in the direction of the optical axis is the length of the optical axis of the side plate. It is formed shorter than the length in the direction, and one end of the side plate in the direction of the optical axis is formed in an annular shape.
  • the length of the notch portion in the optical axis direction is shortened to form one end of the side plate in the optical axis direction in an annular shape, so that one end of the side plate in the optical axis direction is not formed in an annular shape.
  • the rigidity of the side plate can be improved. Therefore, it can suppress that a side plate deform
  • the invention according to claim 8 is the lens driving device according to any one of claims 4 to 6, wherein the case is provided with a top plate connected to the side plate and having an opening hole, The gist of the positioning portion is provided on the top plate.
  • the magnetic plate can be formed long in the direction of the optical axis. Therefore, by forming the magnetic plate long in the direction of the optical axis, even if the holder moves in the direction of the optical axis, the magnetic plate and the magnet can face each other in the radial direction, and the magnetic force between the magnetic plate and the magnet Therefore, it is possible to suppress the holder from being inclined with respect to the direction of the optical axis.
  • the gist of the ninth aspect of the present invention is that, in the lens driving device according to the eighth aspect, the thickness of the top plate is formed to be greater than the thickness of the side plate.
  • the positioning part is provided on the top plate by forming the thickness of the top plate larger than the thickness of the side plate, it is possible to suppress the case rigidity from being excessively lowered.
  • the invention described in claim 10 is a camera module, and is summarized in that the lens driving device according to any one of claims 1 to 9 is mounted.
  • the lens driving device can be suitably mounted on the camera module.
  • the magnetic distances between the magnets and the magnetic plates are substantially equal to each other by keeping the radial distances between the plurality of magnets and the magnets and the magnetic bodies facing each other in the radial direction constant.
  • a camera module equipped with the lens driving device.
  • the lens driving device according to the present invention is embodied as a lens driving device used for autofocus of a camera mounted on a mobile phone
  • optical axis direction the direction along the optical axis of the lens
  • radial direction the radial direction of the lens
  • the direction surrounding the lens from the radial direction is referred to as “circumferential direction”.
  • the base 30 side is defined as “lower side”
  • the case 40 side is defined as “upper side”.
  • the side toward the optical axis is defined as “inside”
  • the side away from the optical axis is defined as “outside”.
  • the whole structure of the lens drive device 1 is demonstrated.
  • the lens holder RH is omitted.
  • the lens driving device 1 is provided with a movable body 1a that can move in the optical axis direction, a driving force applied to the moving body 1a, and a fixed that is fixed to a device on which the lens driving device 1 is mounted. It is comprised by the body 1b.
  • the lens driving device 1 performs autofocusing of the camera by moving the lens in the optical axis direction as the moving body 1a moves in the optical axis direction.
  • the lens driving device 1 according to the present embodiment has about 8. in plan view in the optical axis direction. It is formed in a 5 mm square, and the height of the lens driving device 1 in the optical axis direction is about 3 mm.
  • the moving body 1a includes a lens, a lens holder RH that holds the lens, a holder 10 that holds the lens holder RH, and a plurality of magnets 20 that are fixed to the holder 10.
  • the four magnets 20 of this embodiment are being fixed to the holder 10 via the fixed distance in the circumferential direction mutually.
  • the magnet 20 is a neodymium magnet (Ne-Fe-B).
  • the magnet 20 of this embodiment uses a neodymium sintered magnet formed in a plate shape.
  • the holder 10 integrally provided with the resin material by injection molding is formed in an octagonal shape in plan view in the optical axis direction.
  • a holding portion 12 that is recessed radially inward from the side surface 10a of the holder 10 and that opens on the upper side in the optical axis direction is provided.
  • the radial position of the outer surface 20a which is the outer surface in the radial direction of the magnet 20, and the radial position of the side surface 10a of the holder 10 are formed to be equal to each other.
  • a shaft 50 (FIG. 1) is provided between the magnets 20 adjacent in the circumferential direction.
  • Through-holes 13 and 14 are provided to enable insertion of the reference holes.
  • the through hole 13 is provided in a circular shape, and the through hole 14 is provided in a long hole shape.
  • the through-hole 14 is formed by making the direction along the diagonal L1 which connected each center of the through-hole 13 and the through-hole 14 into a major axis, and making the direction orthogonal to the diagonal L1 into a minor axis.
  • the fixed body 1 b includes a base 3 that constitutes an outer frame of the lens driving device 1. 0 and the case 40, a shaft 50 that is fixed to the base 30 and guides the movement of the holder 10 in the optical axis direction, and a coil 60 that forms a magnetic field by applying an electric current.
  • rectangular plate-like magnetic plates 70 formed of magnetic steel plates are fixed to the base 30 and the case 40 on the outer side in the radial direction of the coil 60.
  • the base 30 is integrally provided with a resin material by injection molding.
  • the base 30 is provided with a base 31 that forms the lower surface of the outer frame of the lens driving device 1 and a support column 32 that extends from the base 31 along the upper side in the optical axis direction.
  • the base 31 is formed in a square shape in a plan view in the optical axis direction.
  • pillar part 32 is provided in the four corners of the base 31, respectively.
  • two magnetic plates 70 are disposed at two locations on the periphery of the base 30.
  • the case 40 constitutes a side surface and an upper surface of the outer frame of the lens driving device 1.
  • the case 40 is attached to the base 30 so as to surround the outer side of the coil 60 in the radial direction.
  • the top plate 40a of the case 40 is provided with two through holes 41 into which the shaft 50 is inserted and an opening 42 through which the movable body 1a can be inserted.
  • the side plate 40b of the case 40 is provided with a notch 43 in which the magnetic plate 70 is disposed.
  • the shaft 50 is fixed to the base 31 of the base 30 and is inserted into the through hole 41 of the case 40 so as to be held along the optical axis direction.
  • This shaft 5 At 0, the holder 10 is inserted.
  • the holder 10 can move along the shaft 50 by making it slidable with respect to the shaft 50. That is, the moving body 1a is guided by the shaft 50 and moves in the optical axis direction.
  • two shafts 50 having the same shape and the same dimensions are used.
  • the coil 60 is wound around the four support portions 32 of the base 30. And
  • the coil 60 includes a first coil 61 wound in a predetermined direction and a second coil 62 wound in a direction opposite to the winding direction of the first coil 61.
  • a current is applied to the first coil 61 and the second coil 62, magnetic fields are generated around the first coil 61 and the second coil 62, respectively.
  • the magnetic field and the magnet 20 generate a force that moves the moving body 1a in the optical axis direction.
  • a stepped portion 3 in which a case 40 is fitted to the base portion 31 of the base 30. 4 is provided.
  • the step portion 34 is formed in a substantially quadrangular shape.
  • magnetic plate positioning portions 35 that determine the radial position of the magnetic plate 70 are provided on two sides where the magnetic plate 70 is disposed.
  • the magnetic plate positioning portion 35 is formed in a concave shape that is recessed inward in the radial direction from the side surface 34a of the stepped portion 34 and opened upward in the optical axis direction.
  • a magnetic plate positioning portion 44 that determines the radial position of the magnetic plate 70 is provided on the upper portion 43 a in the optical axis direction constituting the cutout portion 43 of the case 40. ing.
  • the magnetic plate positioning portion 44 is formed in a concave shape that is recessed inward in the radial direction from a position overlapping the notch portion 43 in the longitudinal direction on the periphery of the top plate 40 a of the case 40.
  • the upper portion of the magnetic plate 70 in the optical axis direction contacts the magnetic plate positioning portion 44
  • the lower portion of the magnetic plate 70 in the optical axis direction contacts the magnetic plate positioning portion 35. That is, the magnetic plate positioning portions 35 and 44 support both ends of the magnetic plate 70 in the optical axis direction. Therefore, the magnetic plate 70 is suppressed from being inclined with respect to the optical axis.
  • the base portion 31 of the base 30 is provided with a shaft positioning portion 36 that determines the radial position of the shaft 50.
  • This shaft positioning portion 36 Is formed in a bottomed hole shape for fixing the shaft 50.
  • the step portion 34, the magnetic plate positioning portion 35, and the shaft positioning portion 36 are integrally formed when the base 30 is injection molded.
  • the longitudinal width H ⁇ b> 1 of the notch 43 of the case 40 is substantially equal to the longitudinal width H ⁇ b> 2 of the magnetic plate 70.
  • the magnetic plate 70 is fixed to the notch 43 of the case 40 and the base 31 of the base 30 with an adhesive.
  • the magnetic plate 70 is filled from the outside in the radial direction. This adhesive is desirably filled at least on the periphery of the magnetic plate 70. In the present embodiment, the entire surface of the radially outer surface of the magnetic plate 70 is filled with an adhesive.
  • the longitudinal width H2 of the magnetic plate 70 is shown smaller than the longitudinal width H1 of the notch 43. H2 is substantially equal to each other.
  • the radial position of the magnetic plate 70 is set so as to overlap the radial position of the side plate 40 b of the case 40.
  • the magnetic plate 70 is arranged on the outer side in the radial direction from the side plate 40 b, it is necessary to provide the base 30 with a radial place for arranging the magnetic plate 70.
  • the magnetic plate 70 is disposed on the inner side in the radial direction than the side plate 40b, it is necessary to provide the base 30 and the case 40 with a radial position for arranging the magnetic plate 70. Accordingly, in any case, the lens driving device 1 becomes large in the radial direction.
  • the case 40 or the base 30 does not need to be enlarged in the radial direction. Can be planned.
  • the magnetic plate positioning portions 35 and 44 are formed on the outer side in the radial direction from the coil 60. As a result, the magnetic plate 70 is disposed with a gap in the radial direction from the coil 60. The magnetic plate 70 is supported by the magnetic plate positioning portions 35 and 44 at both ends in the optical axis direction. Since it is suppressed that it inclines with respect to an optical axis direction, it has suppressed that the magnetic board 70 contacts the coil 60. FIG. Therefore, the magnetic plate positioning portions 35 and 44 can set an accurate position in the radial direction of the magnetic plate 70 and can suppress the inclination of the magnetic plate 70 in the optical axis direction. Even if the distance in the radial direction is set small, the magnetic plate 70 The contact between the coil 60 and the coil 60 is suppressed.
  • the shaft 50 fixed to the shaft positioning part 36 of the base 30 of the fixed body 1b is inserted in the through holes 13 and 14 of the holder 10 of the movable body 1a.
  • the magnetic plate 70 is disposed only on one side of the center line with the diagonal line L1 formed by the through holes 13 and 14 as the center line.
  • the magnetic plate 70 is attached to the magnetic plate positioning portion 35 provided on the two sides of the step portion 34 on one side of the diagonal line L1 in the base portion 31 of the base 30.
  • the two magnetic plates 70 are respectively arranged at the center positions of the magnets 20 that are opposed to the magnetic plates 70 in the radial direction.
  • the direction of the attractive force F ⁇ b> 2 to the outside in the radial direction of the magnet 20 generated by the magnet 20 that is opposed to the radial direction of the magnet 20 is orthogonal.
  • the direction of the resultant force F3 between the attractive force F1 and the attractive force F2 is the diagonal line L1.
  • a one-dot chain line in FIG. 7 indicates the optical axis direction.
  • the moving body 1a is located at the home position. Specifically, the lower surface of the holder 10 of the moving body 1 a is in contact with the upper surface of the base portion 31 of the base 30. Mobile body 1a Is in the home position, no current is applied to the coil 60.
  • the moving body 1a moves to the position shown in FIG. 7B.
  • a current is applied to the first coil 61 and the second coil 62
  • a magnetic field is generated around each of the first coil 61 and the second coil 62.
  • a magnetic circuit is formed by the magnetic field and the magnet 20, and a force for moving the moving body 1a upward in the optical axis direction is generated.
  • the moving body 1a moves from the home position shown in FIG. 7A upward in the optical axis direction to the position shown in FIG. 7B.
  • the lens is moved to the on-focus position while moving the moving body 1a upward and downward in the optical axis direction.
  • the moving body 1a is urged in the direction of the resultant force F3 by the magnetic force generated between the two magnetic plates 70 and the magnets 20 facing the magnetic plates 70 in the radial direction. Is done.
  • the moving body 1a is biased in the direction of the resultant force F3
  • the through holes 13 and 14 of the holder 10 and the shaft 50 inserted into the through holes 13 and 14 are brought into pressure contact. For this reason, even when the moving body 1a is moved in the vertical direction, a frictional drag acts on the gravity.
  • the moving body 1a is maintained at the on-focus position.
  • the filter 2 and the image sensor 3 are disposed on the base 30 side of the lens driving device 1. That is, the filter 2 and the image sensor 3 are disposed below the base 30 in the optical axis direction.
  • the Hall element 4 is disposed as a position detection element. Based on the signal from the Hall element 4, the position of the moving body 1a is detected.
  • a CPU Central Processing Unit
  • CP U5 processes the signal input from the image sensor 3 to obtain the contrast value of the captured image. Then, the position of the moving body 1a having the best contrast value is acquired as the on-focus position.
  • the CPU 5 drives the moving body 1a toward the on-focus position.
  • C The PU 5 monitors the signal from the hall element 4 and drives the moving body 1a until the signal from the hall element 4 is in a state corresponding to the on-focus position. Thereby, the moving body 1a is positioned at the on-focus position.
  • the lens driving device 1 of the present embodiment According to the lens driving device 1 of the present embodiment, the following effects can be obtained.
  • the magnetic plate positioning part 35 which determines the position of the radial direction of the magnetic plate 70, 44 is a structure provided in the base 31 and the case 40 of the base 30, respectively. According to this configuration, the size of the radial distance between the two magnetic plates 70 and the two magnets 20 can be set with high accuracy. Therefore, the radial distance between the magnetic plate 70 and the magnet 20 can be made equal to each other, and the magnetic forces between the magnetic plate 70 and the magnet 20 can be made equal to each other.
  • the shaft positioning portion 36 for determining the position of the shaft 50 is provided integrally with the support portion 32 at the base portion 31 of the base 30, the radial position of the magnet 20 with respect to the coil 60 is set with high accuracy. be able to. Therefore, the magnetic forces between the coil 60 and the four magnets 20 can be made equal to each other.
  • the magnetic plate positioning portion 35 and the shaft positioning portion 36 are integrally provided when the base 30 is injection molded, the magnetic plate positioning portion 35 and the shaft positioning portion 3 are provided. Compared with the case where 6 is provided by additional machining, the manufacturing process of the base 30 can be simplified, and the position accuracy of the shaft positioning portion 36 with respect to the magnetic plate positioning portion 35 can be improved. Therefore, the position of the magnetic plate 70 relative to the magnet 20 and the coil 6 Since the position of the magnet 20 with respect to 0 can be set with higher accuracy, the two magnets 20 and 2 The magnetic forces between the magnetic plates 70 can be made equal to each other more reliably, and the magnetic forces between the four magnets 20 and the coils 60 can be made more reliable to be equal to each other.
  • the magnetic plate positioning portions 35 and 44 are in contact with both ends of the magnetic plate 70 in the optical axis direction. According to this configuration, the magnetic plate 7 by the magnetic plate positioning portions 35 and 44 is used. Since the length between the optical axis directions supporting 0 can be increased, the magnetic plate 70 can be prevented from being inclined with respect to the optical axis direction. Accordingly, the radial distance between the magnetic plate 70 and the magnet 20 can be made equal regardless of whether the moving body 1a is at the home position or the on-focus position, and the magnetic force between the magnetic plate 70 and the magnet 20 can be made equal. Can do.
  • the magnetic plate 70 is arranged on the outer side in the radial direction from the coil 60, and a gap is provided between the magnetic plate 70 and the coil 60 in the radial direction. According to this configuration, since the contact between the magnetic plate 70 and the coil 60 can be suppressed, the magnetic plate 70 The bending of the coil 60 due to the contact between the coil 60 and the coil 60 can be suppressed.
  • the position of the magnetic plate 70 in the radial direction can be accurately set by the magnetic plate positioning portions 35 and 44, an error in the position of the magnetic plate 70 in the radial direction with respect to the coil 60 can be reduced. Therefore, even if the radial gap between the coil 60 and the magnetic plate 70 is made small, it is possible to prevent the magnetic plate 70 and the coil 60 from contacting each other. as a result, It is possible to reduce the size of the lens driving device 1 in the radial direction while suppressing contact between the magnetic plate 70 and the coil 60. Further, since the radial distance between the magnet 20 and the magnetic plate 70 can be reduced, the magnetic efficiency between the magnet 20 and the magnetic plate 70 can be improved.
  • the magnetic plate positioning portions 35 and 44 suppress the inclination of the magnetic plate 70 with respect to the optical axis direction, the radial distance between the magnetic plate 70 and the coil 60 can be further reduced. Therefore, the magnetic efficiency between the magnet 20 and the magnetic plate 70 can be further improved, and the lens driving device 1 can be further downsized in the radial direction.
  • the notch 43 in which the magnetic plate 70 is disposed on the side plate 40 b of the case 40. is provided.
  • the radial position of the side plate 40 b and the radial position of the magnetic plate 70 overlap each other, so that the cutout portion 43 forms an arrangement space for the magnetic plate 70. Therefore, it is not necessary to form an arrangement space for the magnetic plate 70 on the outer side or the inner side in the radial direction of the side plate 40b. Therefore, compared with the configuration in which the magnetic plate 70 is arranged on the outer side or the inner side in the radial direction than the side plate 40b, The case 40 can be reduced in size in the radial direction. As a result, the lens drive device 1 can be reduced in size in the radial direction.
  • the longitudinal width H1 of the notch 43 of the case 40 and the longitudinal width H2 of the magnetic plate 70 are substantially equal. According to this configuration, the gap G formed between the longitudinal direction of the notch 43 and the magnetic plate 70 can be reduced or eliminated. Accordingly, it is possible to prevent dust from entering the case 40 from the outside of the lens driving device 1 through the gap G.
  • the magnetic plate 70 in the notch 43 the position of the magnetic plate 70 in the longitudinal direction with respect to the case 40 can be determined. Therefore, the position in the longitudinal direction of the magnetic plate 70 relative to the magnet 20 can be accurately determined. Thereby, since each direction of attractive force F1 and F2 between the magnet 20 and the magnetic plate 70 can be controlled, the resultant force F3 of the attractive forces F1 and F2 can be accurately perpendicular to the diagonal line L1. Can do.
  • an adhesive is filled between the notches 43 and the magnetic plate 70 in the longitudinal direction.
  • the magnetic plate 70 is fixed to the notch 43 of the case 40.
  • the adhesive seals the gap G, so that the outside of the lens driving device 1 passes through the gap G. It is possible to more reliably suppress dust from entering the case 40.
  • the magnetic plate positioning portion 44 is configured to be provided on the top plate 40 a of the case 40. According to this configuration, the position of the upper end portion in the optical axis direction of the magnetic plate 70 can be disposed above the lower surface of the top plate 40a. Therefore, even if the moving body 1a moves to the uppermost side in the optical axis direction range in which the moving body 1a is movable, the magnetic plate 70 is disposed at a position facing the magnet 20 in the radial direction. As a result, when the moving body 1a moves upward in the optical axis direction, the radial distance between the magnet 20 and the magnetic plate 70 can be kept constant, and the magnetic force between the magnet 20 and the magnetic plate 70 can be maintained. Can be prevented from becoming unstable.
  • the magnetic plate positioning portion 35 is provided on the upper surface 3 of the step portion 34 provided on the base portion 31 of the base 30. Since it is formed below the optical axis direction than 4b, even if the moving body 1a is located at the home position, the magnetic plate 70 is disposed at a position facing the magnet 20 in the radial direction. As a result, when the moving body 1a moves toward the home position, the radial distance between the magnet 20 and the magnetic plate 70 can be maintained constant, and the magnetic force between the magnet 20 and the magnetic plate 70 is not improved. It can suppress becoming stable.
  • the magnetic plate positioning portions 44 and 35 can make the length of the magnetic plate 70 in the optical axis direction longer than the movable range of the movable body 1a in the optical axis direction. Even if the movement of the direction is performed, the radial distance between the magnet 20 and the magnetic plate 70 can be kept constant, so that the magnetic force can be prevented from becoming unstable.
  • the thickness of the top plate 40a of the case 40 is formed to be thicker than the thickness of the side plate 40b. According to this structure, even if the positioning part 44 is provided in the top plate 40a, it can suppress that the rigidity of the case 40 falls excessively.
  • the top 4 By forming 0a thick, excessive reduction in rigidity of the case 40 can be suppressed even when the side plate 40b is formed thin, so that the case 40 can be reduced in the radial direction. As a result, the lens drive device 1 can be reduced in size in the radial direction.
  • the lens driving device 1 is mounted on a camera module of a mobile phone.
  • the number of electronic components increases as the size and performance of portable devices increase, but the placement space for electronic components is reduced, so that each electronic component is given. Space is shrinking. That is, downsizing of the lens driving device 1 is required.
  • the radial distance between the magnetic plate 70 and the coil 60 is reduced by the positioning portions 35 and 44, and the radial reduction of the case 40 is achieved by the notch portion 43.
  • the size of 1 is reduced in size. Therefore, it is preferable to mount the lens driving device 1 of the present embodiment on the portable device.
  • the lens drive device 1 of this embodiment although applied to the camera module mounted in a mobile telephone, the application range of this invention is not limited to this.
  • the present invention may be applied to a camera module mounted on another portable device.
  • the number of the magnetic plates 70 is not limited to this. Since it is sufficient that the moving body 1a can be urged in one radial direction by the magnetic plate 70 and the magnet 20, for example, an L-shaped magnetic plate 80 may be used as shown in FIG. Here, the areas of the portions of the magnetic plate 80 facing the two magnets 20 are preferably equal. With this configuration, the magnetic forces between the magnet 20 and the magnetic plate 80 facing the magnet 20 in the radial direction can be made equal to each other.
  • the end portion 81 of the magnetic plate 80 is positioned at the substantially central portion of the magnet 20. The position of is not limited to this.
  • the magnetic plate 80 is formed on the outer surface 20a of the magnet 20. The position of the end 81 may be set so as to face the entire surface.
  • the positioning part 44 was provided in the top plate 40a of the case 40
  • the position in which the magnetic board positioning part 44 is provided is not limited to this.
  • the length of the notch 43 in the optical axis direction is shorter than the length of the side plate 40b in the optical axis direction.
  • the magnetic plate positioning part 44 may be provided on the upper part 43 a of the notch part 43. In this case, since the upper end portion 45 of the side plate 40b is formed in an annular shape along the periphery of the top plate 40a, the rigidity of the case 40 can be improved.
  • locking part 46 in the notch part 43 of the side plate 40b of the case 40 as the magnetic board positioning part 44 may be sufficient.
  • the radial position of the magnetic plate 70 is determined.
  • the length of the locking portion 46 in the optical axis direction is formed to be equal to the length of the cutout portion 43 in the optical axis direction.
  • the length in the optical axis direction is not limited to this.
  • the cutout 43 may be formed shorter than the length in the optical axis direction.
  • the magnetic plate positioning unit 44 is provided on the top plate 40a.
  • the magnetic plate positioning unit 44 is formed in a step shape that is recessed from the lower surface of the top plate 40a to the upper side in the optical axis direction.
  • the shape of is not limited to this.
  • a protrusion 47 protruding downward from the lower surface of the top plate 40a in the optical axis direction may be provided, and a step shape may be formed by the protrusion 47 and the lower surface. This eliminates the need to reduce the thickness of the top board 40a. A reduction in the rigidity of the case 40 can be prevented.
  • both of the magnetic plate positioning portions 35 and 44 have a step shape that opens outward in the radial direction, but the shape of the magnetic plate positioning portion is not limited to this. Absent.
  • the recess 48 may be provided on the lower surface of the top plate 40 a of the case 40 and the recess 37 may be provided on the base 31 of the base 30. With this configuration, the magnetic plate 70 is sandwiched from both sides in the radial direction, so that the magnetic plate 70 can be reliably prevented from being detached from the base 30 and the case 40.
  • the cutout portion 43 in the side plate 40b of the case 40 has the shape of an opening hole that penetrates the side plate 40b in the radial direction, but the shape of the cutout portion 43 is limited to this. There is nothing.
  • the notch 43 may have a concave shape that is recessed inward in the radial direction from the side plate 40 b. By bringing the magnetic plate 70 into contact with the notch 43, the notch 43 can also serve as a magnetic plate positioning part.
  • the magnetic plate positioning unit 35 is provided on the base 30 side and the magnetic plate positioning unit 44 is provided on the case 40 side as the magnetic plate positioning unit.
  • the configuration of is not limited to this.
  • the magnetic plate positioning part may be configured to be provided only on the base 30 side or only on the case 40 side.
  • the top view which shows the planar structure of a moving body about the lens drive device of the embodiment.
  • A) The perspective view which shows the disassembled perspective structure of a fixing body about the lens drive device of the embodiment.
  • B) The enlarged view which expanded the magnetic board positioning part of the base side about the lens drive device of the embodiment.
  • C The enlarged view which expanded the magnetic plate positioning part by the side of the case about the lens drive device of the embodiment.
  • the top view which shows the arrangement
  • A Sectional drawing which shows the cross-sectional structure of the state in which a moving body is located in a home position about the lens drive device of the embodiment.
  • B Sectional drawing which shows the cross-sectional structure of the state in which a moving body is located in an on-focus position about the lens drive device of the embodiment.
  • the schematic diagram which shows the structure of the camera module carrying the lens drive device of the embodiment.
  • the top view which shows the arrangement

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

L’invention concerne un dispositif d’actionnement de lentille dans lequel la distance radiale entre des aimants et des plaques magnétiques faisant face radialement aux aimants, respectivement, est maintenue à un niveau constant afin de rendre les forces magnétiques entre chacun des aimants et chacune des plaques magnétiques essentiellement égales les unes aux autres. L’invention concerne également un module de caméra dans lequel est monté un dispositif d’actionnement de lentille. Le dispositif d’actionnement de lentille comprend une base (30) ayant une section de base en forme de plaque essentiellement plane, un support pour tenir une lentille et capable de se déplacer dans la direction de l’axe optique de la lentille par rapport à la base (30), des aimants entourant radialement la lentille et fixés au support, un boîtier (40) monté sur la base et entourant extérieurement le support, et des plaques magnétiques (70) faisant face radialement aux aimants. Des sections de positionnement de plaques magnétiques (35, 44) pour déterminer les positions radiales des plaques magnétiques (70) sont disposées sur la base (30) et le boîtier (40).
PCT/JP2009/064462 2008-11-18 2009-08-18 Dispositif d’actionnement de lentille et module de caméra dans lequel est monté ce dispositif d’actionnement de lentille WO2010058637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-294835 2008-11-18
JP2008294835A JP2012027044A (ja) 2008-11-18 2008-11-18 レンズ駆動装置及びレンズ駆動装置を搭載したカメラモジュール

Publications (1)

Publication Number Publication Date
WO2010058637A1 true WO2010058637A1 (fr) 2010-05-27

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JP (1) JP2012027044A (fr)
WO (1) WO2010058637A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011024805A1 (fr) * 2009-08-25 2011-03-03 三洋電機株式会社 Dispositif de commande de lentille et module d'appareil photographique le comportant
JP2013105138A (ja) * 2011-11-16 2013-05-30 Nidec Sankyo Corp レンズ駆動装置
CN109739009A (zh) * 2019-02-20 2019-05-10 重庆睿恩光电子有限责任公司 透镜驱动装置、摄像头装置及电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006091207A (ja) * 2004-09-22 2006-04-06 Nidec Sankyo Corp レンズ駆動装置
JP2007025640A (ja) * 2005-06-17 2007-02-01 Nidec Sankyo Corp レンズ駆動装置
JP2007041616A (ja) * 2006-10-11 2007-02-15 Nidec Sankyo Corp レンズ駆動装置の製造方法
JP2007094364A (ja) * 2005-09-02 2007-04-12 Nidec Sankyo Corp レンズ駆動装置
WO2008093804A1 (fr) * 2007-01-31 2008-08-07 Sharp Kabushiki Kaisha Actionneur, dispositif d'imagerie et dispositif électronique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006091207A (ja) * 2004-09-22 2006-04-06 Nidec Sankyo Corp レンズ駆動装置
JP2007025640A (ja) * 2005-06-17 2007-02-01 Nidec Sankyo Corp レンズ駆動装置
JP2007094364A (ja) * 2005-09-02 2007-04-12 Nidec Sankyo Corp レンズ駆動装置
JP2007041616A (ja) * 2006-10-11 2007-02-15 Nidec Sankyo Corp レンズ駆動装置の製造方法
WO2008093804A1 (fr) * 2007-01-31 2008-08-07 Sharp Kabushiki Kaisha Actionneur, dispositif d'imagerie et dispositif électronique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011024805A1 (fr) * 2009-08-25 2011-03-03 三洋電機株式会社 Dispositif de commande de lentille et module d'appareil photographique le comportant
JP2013105138A (ja) * 2011-11-16 2013-05-30 Nidec Sankyo Corp レンズ駆動装置
CN109739009A (zh) * 2019-02-20 2019-05-10 重庆睿恩光电子有限责任公司 透镜驱动装置、摄像头装置及电子设备

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