WO2011021502A1 - Lens drive device - Google Patents

Lens drive device Download PDF

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Publication number
WO2011021502A1
WO2011021502A1 PCT/JP2010/063169 JP2010063169W WO2011021502A1 WO 2011021502 A1 WO2011021502 A1 WO 2011021502A1 JP 2010063169 W JP2010063169 W JP 2010063169W WO 2011021502 A1 WO2011021502 A1 WO 2011021502A1
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WO
WIPO (PCT)
Prior art keywords
driving
optical axis
lens
drive
coils
Prior art date
Application number
PCT/JP2010/063169
Other languages
French (fr)
Japanese (ja)
Inventor
和出達貴
細井守
Original Assignee
日本電産サンキョー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産サンキョー株式会社 filed Critical 日本電産サンキョー株式会社
Publication of WO2011021502A1 publication Critical patent/WO2011021502A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B5/06—Swinging lens about normal to the optical axis
    • 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
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0933—Details of stationary parts
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0935—Details of the moving parts
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path

Definitions

  • the present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like.
  • a lens driving device for driving a photographing lens of a camera used in a mobile phone or the like a moving lens body that moves in the optical axis direction while holding a plurality of lenses, and a moving lens through two leaf springs 2.
  • a lens driving device including a fixed body that holds a body in a movable manner is known (see, for example, Patent Document 1).
  • a driving coil is wound around the outer periphery of a cylindrical sleeve constituting a moving lens body.
  • four magnets are arranged so as to face the outer peripheral surface of the driving coil.
  • tilt amount tilt amount of the lens mounted on the camera
  • an object of the present invention is to provide a lens driving device capable of suppressing the inclination of the optical axis of the lens.
  • a lens driving device of the present invention includes a movable body that holds a lens and is movable in the optical axis direction of the lens, and a drive mechanism for driving the movable body.
  • a drive mechanism for driving the movable body includes a movable body that holds a lens and is movable in the optical axis direction of the lens, and a drive mechanism for driving the movable body.
  • Four drive magnet portions formed in a substantially column shape and four drive coils formed in a substantially cylindrical shape are provided, and the four drive magnet portions are light in the longitudinal direction.
  • the four driving coils are arranged so as to be substantially parallel to the axial direction and do not overlap each other when viewed from the optical axis direction, and each of the four driving coils has four inner peripheral surfaces for driving.
  • each of the four drive coils is wound by each of the four conductors. Characterized in that it is formed by.
  • each of the four driving coils wound in a substantially cylindrical shape has an inner peripheral surface that is in contact with each of the outer peripheral surfaces of the four driving magnet portions via a predetermined gap.
  • the driving magnet portion is disposed so as to face the driving magnet portion so that the longitudinal direction thereof is substantially parallel to the optical axis direction, and magnetic flux passing through the driving coil at a position facing the driving coil. It is magnetized to occur. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet portions and the four driving coils.
  • each of the four drive coils is formed by winding each of the four conductive wires.
  • the magnitude of the driving force generated between each of the four driving magnets and the four driving coils is controlled. You can change that.
  • the four drive magnet portions are arranged at positions that do not overlap each other when viewed from the optical axis direction. Therefore, the inclination of the optical axis of the lens can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet units and the four driving coils. Therefore, in the present invention, it is possible to suppress the inclination of the optical axis of the lens by appropriately correcting the inclination of the optical axis of the lens. In the present invention, since it is possible to correct the tilt of the optical axis of the lens, it is possible to correct this shake when shake occurs in the camera in which the lens driving device is mounted.
  • the four drive magnet portions and the four drive coils are arranged in a rotational symmetry of about 90 ° about the optical axis of the lens.
  • the drive magnet portion includes two substantially columnar drive magnet pieces arranged so as to overlap in the optical axis direction, and the opposing surfaces of the two drive magnet pieces in the optical axis direction are any
  • the same magnetic pole is preferably magnetized. If comprised in this way, between the opposing surfaces of two drive magnet pieces, the density of the magnetic flux which passes a drive coil can be raised. Therefore, a magnetic circuit for driving the movable body can be formed more efficiently, and the driving force generated in each of the four drive magnet portions and the four drive coils can be increased. As a result, it is possible to improve the responsiveness when correcting the tilt of the optical axis of the lens, and to effectively suppress the tilt of the optical axis of the lens.
  • the lens driving device preferably includes a sensor for detecting the inclination of the optical axis of the lens, and the sensor is preferably attached to the movable body. If comprised in this way, the inclination of the optical axis of a lens can be directly detected with a sensor. Therefore, it is possible to correct the inclination of the optical axis of the lens in real time by correcting the inclination of the optical axis of the lens based on the detection result of the sensor.
  • the lens driving device includes a fixed body that holds the movable body so as to be movable in the optical axis direction, and a sensor for detecting the inclination of the optical axis of the lens, and the sensor is attached to the fixed body. Also good.
  • the senor is preferably disposed between adjacent drive coils in the circumferential direction of the lens driving device. If comprised in this way, a sensor can be arrange
  • the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the driving mechanism.
  • Each of the driving magnet units and the four driving coils is disposed at each of the four corners of the lens driving device, and the control unit is configured to select one of the four driving coils based on the output result from the sensor.
  • the first current control unit that controls the magnitude of the current supplied to each of the two drive coils arranged substantially point-symmetrically with respect to the optical axis of the lens. It is preferable to include a second current control unit that controls the magnitude of the current supplied to each of the remaining two drive coils.
  • the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially square shape, and the four driving magnet portions and the four driving coils are: It is preferable that the optical axis of the lens is arranged in a rotational symmetry of about 90 ° about the optical axis.
  • the tilt of the optical axis of the lens with the predetermined first direction orthogonal to the optical axis direction as the axial direction is corrected by the driving coil controlled by the first current control unit, and the second current
  • the drive coil controlled by the control unit can correct the inclination of the optical axis of the lens with the second direction orthogonal to the optical axis direction and the first direction as the axial direction. Therefore, the four driving coils can correct the inclination of the optical axis in all directions.
  • the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the driving mechanism.
  • Each of the driving magnet units and the four driving coils is disposed at each of the four corners of the lens driving device, and the control unit is configured to select one of the four driving coils based on the output result from the sensor.
  • the lens driving device is a lens driving device having a substantially rectangular shape or a substantially square shape when viewed from the optical axis direction of the lens, and holds the lens.
  • a movable body movable in the optical axis direction; and a drive mechanism for driving the movable body, the drive mechanism comprising four substantially columnar drive magnet portions disposed at each of the four corners of the lens drive device; And four drive coils formed by being wound in a substantially cylindrical shape, and the four drive magnet portions are arranged so that the longitudinal direction thereof is substantially parallel to the optical axis direction.
  • Each of the driving coils is arranged so that the inner peripheral surface thereof faces each of the outer peripheral surfaces of the four driving magnet portions with a predetermined gap, and the driving magnet portion is connected to the driving coil. Magnetized to generate magnetic flux that passes through the drive coil at the opposite position.
  • two driving coils arranged adjacent to each other in the circumferential direction centering on the optical axis of the lens are formed by sequentially winding one conductive wire, and the rest The two driving coils are formed by sequentially winding the other one conducting wire, or each of the four driving coils is wound by each of the four conducting wires.
  • the two driving coils arranged adjacent to each other in the circumferential direction around the optical axis of the lens are connected in series, and the remaining two The drive coils are connected in series.
  • each of the four driving coils wound in a substantially cylindrical shape has an inner peripheral surface that is in contact with each of the outer peripheral surfaces of the four driving magnet portions via a predetermined gap.
  • the driving magnet portion is disposed so as to face the driving magnet portion so that the longitudinal direction thereof is substantially parallel to the optical axis direction, and magnetic flux passing through the driving coil at a position facing the driving coil. It is magnetized to occur. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet portions and the four driving coils.
  • one of the four driving coils arranged so as to be adjacent to each other in the circumferential direction centered on the optical axis of the lens is sequentially wound by one conductive wire.
  • the remaining two driving coils are formed by sequentially winding another one conducting wire.
  • each of the four driving coils is formed by winding each of the four conductive wires, and is adjacent to each other in the circumferential direction around the optical axis of the lens among the four driving coils.
  • the two driving coils arranged so as to fit with each other are connected in series, and the remaining two driving coils are connected in series.
  • each of the four drive magnet portions and the four drive coils has four corners of the lens drive device that are substantially rectangular or square when viewed from the optical axis direction. Is arranged. Therefore, the magnitude of the driving force generated between the two driving magnet portions and the driving coil adjacent in the circumferential direction and the driving force generated between the other two driving magnet portions and the driving coil are reduced.
  • the lens driving device of the present invention it is possible to suppress the tilt of the optical axis of the lens.
  • FIG. 2 is a cross-sectional view taken along a line EE in FIG. 1. It is a disassembled perspective view of the principal part of the lens drive device shown in FIG.
  • FIG. 4 is a plan view for explaining the arrangement of four drive magnet units and four drive coils shown in FIG. 3.
  • FIG. 4 is a side view of the drive magnet unit and the drive coil shown in FIG. 3.
  • FIG. 6 is a diagram showing a driving magnet piece and a driving coil from the GG direction of FIG. 5.
  • FIG. 3 is a circuit diagram illustrating a configuration of a control unit and its peripheral part of the drive mechanism shown in FIG. 2.
  • FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention.
  • 2 is a cross-sectional view taken along the line EE of FIG.
  • FIG. 3 is an exploded perspective view of a main part of the lens driving device 1 shown in FIG.
  • the lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. That is, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. In this embodiment, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square.
  • an image sensor (not shown) is arranged on the lower side in FIG. 2 (that is, the Z2 direction side), and the upper side in FIG. 2 (that is, the Z1 direction).
  • the subject placed on the side) is photographed. Therefore, in the following description, the Z1 direction side is the subject side (object side), and the Z2 direction side is the anti-subject side (imaging element side, image side).
  • two directions orthogonal to the optical axis L and orthogonal to each other are defined as an X direction and a Y direction.
  • a plane formed from the X direction and the Y direction is defined as an XY plane.
  • the four side surfaces of the lens driving device 1 are parallel to the X direction or the Y direction.
  • the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction.
  • the lens driving device 1 also includes a sensor 10 for detecting the inclination of the optical axis L of the lens.
  • the movable body 2 includes a sleeve 6 that holds a lens holder 5 to which a plurality of lenses are fixed.
  • the lens holder 5 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed on the inner peripheral side thereof.
  • a male screw is formed on the outer peripheral surface of the lens holder 5.
  • the sleeve 6 is formed in a substantially cylindrical shape, and holds the lens holder 5 on the inner peripheral side thereof. That is, a female screw that engages with a male screw formed on the outer peripheral surface of the lens holder 5 is formed on the inner peripheral surface of the sleeve 6.
  • a part of a leaf spring (not shown) is fixed to the subject side end and the non-subject side end of the sleeve 6. Another part of the leaf spring is fixed to the fixed body 3, and the movable body 2 is held by the fixed body 3 via the leaf spring.
  • the fixed body 3 includes a first case body 7 disposed on the subject side and a second case body 8 disposed on the opposite subject side.
  • the first case body 7 is formed of a magnetic material, and is formed in a substantially square cylindrical shape with a bottom having a bottom portion 7a and a cylindrical portion 7b. A circular through hole 7c is formed at the center of the bottom 7a arranged on the subject side.
  • the first case body 7 is disposed so as to surround the outer peripheral side of the movable body 2 and the drive mechanism 4.
  • the second case body 8 is formed of a resin material and is formed in a substantially rectangular tube shape. The second case body 8 is attached to the anti-subject side end of the first case body 7 so as to cover the outer peripheral side of the lens holder 5 on the anti-subject side.
  • the drive mechanism 4 includes four drive magnet portions 11 formed in a substantially triangular prism shape, and four drive coils 12 formed in a substantially triangular tube shape.
  • the configuration of the drive mechanism 4 and the configuration of the sensor 10 will be described.
  • FIG. 4 is a plan view for explaining the arrangement of the four drive magnet portions 11 and the four drive coils 12 shown in FIG.
  • FIG. 5 is a side view of the drive magnet unit 11 and the drive coil 12 shown in FIG.
  • FIG. 6 is a diagram showing the driving magnet piece 14 and the driving coil 12 from the GG direction of FIG.
  • the four driving magnet portions 11 are formed in a substantially triangular prism shape, and the four corners (specifically, the longitudinal direction of the lens driving device 1 is set to be substantially parallel to the optical axis direction).
  • the four corners on the inner side of the first case body 7 are disposed.
  • the four driving coils 12 are formed in a substantially triangular cylindrical shape, and the inner peripheral surface thereof is in contact with each of the outer peripheral surfaces of the four driving magnet portions 11 via a predetermined gap. Are arranged to face each other.
  • the lens driving device 1 of the present embodiment is formed so that the shape when viewed from the optical axis direction is a substantially square shape. Therefore, in the present embodiment, the four drive magnet portions 11 and the four drive coils 12 are arranged in a rotational symmetry of about 90 ° with the optical axis L as the center as shown in FIG. .
  • the drive magnet unit 11 is formed in a substantially triangular shape between two drive magnet pieces 13 and 14 having a substantially triangular prism shape and arranged so as to overlap in the optical axis direction, and the drive magnet pieces 13 and 14. And a magnetic plate 15.
  • the driving magnet piece 13 is disposed on the subject side
  • the driving magnet piece 14 is disposed on the opposite subject side. Further, the end surface on the opposite side of the driving magnet piece 13 and the end surface on the subject side of the magnetic plate 15 are fixed, and the end surface on the subject side of the driving magnet piece 14 and the end surface of the magnetic plate 15 on the opposite side of the subject. Is fixed.
  • the driving magnet pieces 13 and 14 are formed so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle, and the driving magnet pieces 13 and 14 are viewed when viewed from the optical axis direction.
  • the two sides excluding the hypotenuse are arranged so as to be substantially parallel to the inner peripheral surface of the cylindrical portion 7 b of the first case body 7. That is, the driving magnet pieces 13 and 14 are arranged so that the oblique sides of the driving magnet pieces 13 and 14 arranged on the diagonal line face each other when viewed from the optical axis direction.
  • the magnetic plate 15 is made of a magnetic material.
  • the magnetic plate 15 is formed in a flat plate shape whose shape when viewed from the optical axis direction is substantially a right triangle similar to the driving magnet pieces 13 and 14.
  • the driving magnet piece 13 is fixed to the bottom 7 a of the first case body 7. Specifically, the end surface on the subject side of the driving magnet piece 13 is fixed to the surface on the side opposite to the subject of the bottom portion 7a, and the end surface on the subject side of the driving magnet piece 13 is on the side opposite to the subject side of the bottom portion 7a. It is in contact with the surface.
  • a plate-like magnetic plate 16 made of a magnetic material is fixed to the end surface of the four drive magnet pieces 14 on the side opposite to the subject, and the end face on the side opposite to the subject of the four drive magnet pieces 14 is fixed. Is in contact with the magnetic plate 16.
  • the magnetic plate 16 is in contact with the inner peripheral surface of the cylindrical portion 7 b of the first case body 7.
  • the driving coil 12 is wound so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle.
  • the four drive coils 12 are fixed to the outer peripheral surface of the sleeve 6. Specifically, the inner circumferential surface of the driving coil 12 and the outer circumferential surface of the driving magnet unit 11 are approximately 4 at a pitch of approximately 90 ° with the optical axis L as the center so that the outer circumferential surface of the driving magnet portion 11 is substantially parallel through a predetermined gap.
  • the drive coils 12 are fixed to the outer peripheral surface of the sleeve 6, and the drive coils 12 are arranged at the four corners inside the first case body 7.
  • the drive coil 12 is disposed at the four corners inside the first case body 7 with predetermined gaps between the drive coil 12 and the inner peripheral surface of the first case body 7, and together with the sleeve 6, the optical axis. It can move in the direction.
  • the non-subject side end of the drive coil 12 does not move to the subject side relative to the subject side end of the drive magnet piece 14, and the subject side end of the drive coil 12 is the drive magnet.
  • the driving magnet unit 11 and the driving coil 12 are formed and arranged so as not to move to the side opposite the subject than the end on the side opposite the subject of the piece 13.
  • each of the four drive coils 12 is formed by winding each of the four conductive wires. That is, one drive coil 12 is formed by one conductive wire.
  • the respective drive coils 12 are referred to as drive coils 12A to 12D.
  • the driving coils 12A to 12D are arranged in this order in the clockwise direction in the circumferential direction of the lens driving device 1 around the optical axis L.
  • the drive coils 12A and 12C are arranged so as to sandwich the optical axis L in a first direction V (first direction V) inclined by approximately 45 ° with respect to the X direction and the Y direction on the XY plane.
  • the drive coil 12 ⁇ / b> A and the drive coil 12 ⁇ / b> C are disposed substantially symmetrical with respect to the optical axis L.
  • driving coils 12B and 12D are arranged so as to sandwich the optical axis L in a second direction W (second direction W) substantially orthogonal to the first direction V on the XY plane.
  • the coil 12B and the driving coil 12D are arranged substantially symmetrical with respect to the optical axis L.
  • the two drive magnet pieces 13 and 14 constituting the drive magnet unit 11 have the same magnetic poles (S pole and S pole, or N pole) in the optical axis direction. N poles) are arranged to face each other. That is, the opposing surfaces of the drive magnet pieces 13 and 14 are both magnetized to the same magnetic pole. For example, the opposing surfaces of the drive magnet pieces 13 and 14 are both magnetized to the S pole. Therefore, a magnetic flux passing through the three surfaces of the driving coil 12 is generated between the driving magnet pieces 13 and 14 as indicated by arrows in FIGS. That is, the drive magnet unit 11 is magnetized so that a magnetic flux passing through the drive coil 12 is generated at a position facing the drive coil 12.
  • the sensor 10 is, for example, a two-axis gyroscope capable of detecting an inclination with two directions orthogonal to each other as directions of rotation axes.
  • the sensor 10 is formed in a flat rectangular parallelepiped shape, and detects an inclination having a direction perpendicular to the thickness direction as the direction of the rotation axis and an inclination having the thickness direction as the direction of the rotation axis.
  • This is a 2-axis gyroscope capable of
  • the sensor 10 is fixed to the outer peripheral surface of the sleeve 6 as shown in FIG.
  • the sensor 10 is disposed between two driving coils 12 adjacent in the circumferential direction of the sleeve 6.
  • the sensor 10 is disposed between the driving coil 12B and the driving coil 12C.
  • the sensor 10 causes the inclination of the sleeve 6 (that is, the inclination of the movable body 2) with the X direction as the direction of the rotation axis and the inclination of the sleeve 6 with the Y direction as the direction of the rotation axis (that is, the movable body). Can be detected.
  • FIG. 7 is a circuit diagram showing the configuration of the control unit 21 and its peripheral part of the drive mechanism 4 shown in FIG.
  • the lens driving device 1 includes a control unit 21 for controlling the driving mechanism 4.
  • the control unit 21 moves the movable body 2 holding the lens in the optical axis direction to perform focus control for focusing the lens, and tilt correction control for correcting the tilt of the optical axis L of the lens.
  • an inclination correction control unit 23 for performing the above.
  • the focus control unit 22 and the inclination correction control unit 23 are configured by a calculation unit such as a CPU, for example.
  • the control unit 21 also includes a current supply circuit 24 that supplies current to the drive coil 12A, a current supply circuit 25 that supplies current to the drive coil 12C, and a current supply circuit 26 that supplies current to the drive coil 12B. And a current supply circuit 27 for supplying a current to the drive coil 12D.
  • the current supply circuits 24 to 27 are connected in parallel so that the same control command value is transmitted from the focus control unit 22. Specifically, the current supply circuits 24 to 27 are connected in parallel from the focus control unit 22 via the adders 28 to 31, and an output signal from the focus control unit 22 is input to the adders 28 to 31. The output signals of the adders 28 to 31 are input to the current supply circuits 24 to 27.
  • the current supply circuits 24 and 25 are connected to the inclination correction control unit 23 via adders 28 and 29 and a differential output amplifier 32, and an output signal from the inclination correction control unit 23 is a differential output amplifier 32.
  • the signals converted into differential outputs by the differential output amplifier 32 are input to the adders 28 and 29.
  • the current supply circuits 26 and 27 are connected to the inclination correction control unit 23 via the adders 30 and 31 and the differential output amplifier 33, and an output signal from the inclination correction control unit 23 is the differential output amplifier 33.
  • the signals converted into differential outputs by the differential output amplifier 33 are input to the adders 30 and 31.
  • the sensor 10 is connected to the inclination correction control unit 23.
  • an inclination correction control unit is provided via a sensor amplifier 34 that amplifies a detection signal of an inclination with the X direction as an axial direction and a sensor amplifier 35 that amplifies a detection signal of an inclination with the Y direction as an axial direction.
  • the sensor 10 is connected to 23, and the detection signal of the sensor 10 is input to the inclination correction control unit 23 via the sensor amplifiers 34 and 35.
  • the focus control unit 22 is connected to a host control unit 36 that controls the camera on which the lens driving device 1 is mounted.
  • the focus control unit 22 when the movable body 2 is moved in the optical axis direction in order to adjust the focus of the lens, the focus control unit 22 outputs a control command value signal toward the current supply circuits 24-27.
  • the sensor 10 does not detect the tilt of the movable body 2 with the X direction and / or the Y direction as the axial direction and no signal is output from the differential output amplifiers 32 and 33, the current supply circuits 24 to 27, a current having the same magnitude is supplied to the drive coils 12A to 12D. Therefore, a substantially equal driving force in the optical axis direction is generated between each of the driving coils 12A to 12D and each of the driving magnet portions 11. Therefore, the movable body 2 moves in the optical axis direction without tilting.
  • the tilt correction control unit 23 performs tilt correction based on the detection signal input from the sensor 10. Is output to the differential output amplifier 32 and / or the differential output amplifier 33.
  • the differential output amplifier 32 When the output signal of the inclination correction control unit 23 is input to the differential output amplifier 32, the differential output amplifier 32 generates a signal converted into a differential output based on this signal, and this signal is added to the adder 28, Output to 29.
  • the differential output amplifier 33 When a signal for tilt correction is input to the differential output amplifier 33, the differential output amplifier 33 generates a signal converted into a differential output based on this signal, and this signal is added to the adders 30, 31. Output toward.
  • the added signals are input to the current supply circuits 24-27. Therefore, a current having a magnitude corresponding to the output signals of the adders 28 to 31 is supplied from the current supply circuits 24 to 27 to the driving coils 12A to 12D. Therefore, a driving force corresponding to the output signals of the adders 28 to 31 is generated between the driving coils 12A to 12D and the driving magnet units 11.
  • the movable body 2 moves in the optical axis direction while tilting, and the tilt of the movable body 2 ( That is, the inclination of the optical axis L of the lens is corrected.
  • a current having the same magnitude is supplied to the driving coil 12A and the driving coil 12B, and the driving coil 12C
  • a current having a magnitude different from that of the current supplied to the drive coils 12A and 12B and the same magnitude as the current supplied to the drive coil 12D, and having the X direction as the axial direction is movable.
  • the inclination of the body 2 is corrected.
  • a current of the same magnitude is supplied to the drive coil 12A and the drive coil 12D, and the drive coil 12B and the driving coil 12C are supplied with a current having a magnitude different from that of the current supplied to the driving coils 12A and 12D and the same magnitude, and the Y direction is defined as the axial direction.
  • the tilt of the movable body 2 is corrected.
  • the tilt correction control unit 23, the adders 28 and 29, and the differential output amplifier 32 drive substantially symmetrical with respect to the optical axis L based on the output result from the sensor 10.
  • a first current control unit 41 that controls the magnitude of the current supplied to the coils 12A and 12C is configured.
  • the second current control unit 42 controls the magnitude of the current supplied to the remaining two drive coils 12B and 12D by the inclination correction control unit 23, the adders 30 and 31, and the differential output amplifier 33. Is configured.
  • each of the four drive coils 12 wound in a substantially triangular cylindrical shape has an inner peripheral surface that is predetermined with each of the outer peripheral surfaces of the four drive magnet portions 11. It arrange
  • the drive magnet unit 11 is arranged so that its longitudinal direction is substantially parallel to the optical axis direction, and a magnetic flux passing through the drive coil 12 is generated at a position facing the drive coil 11. Magnetized. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet units 11 and the four driving coils 12.
  • each of the four drive coils 12 is formed by winding each of the four conductive wires.
  • the magnitude of the driving force generated in each of the four driving magnets 11 and the four driving coils 12 is controlled. You can change that.
  • the four drive magnet portions 11 are arranged at the four corners of the lens drive device 1. Therefore, the inclination of the optical axis L can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet portions 11 and the four driving coils 12. Therefore, in this embodiment, it is possible to suppress the inclination of the optical axis L by appropriately correcting the inclination of the optical axis L.
  • the movable body without tilting the optical axis L is obtained by making the magnitudes of the driving forces generated between the four driving magnet portions 11 and the four driving coils 12 the same. 2 can be driven in the direction of the optical axis. That is, the lens focus operation and the optical axis L inclination correction can be performed using the common drive magnet unit 11 and the drive coil 12. Therefore, the configuration of the lens driving device 1 is simplified as compared with the case where a driving mechanism for performing the focusing operation of the lens and a driving mechanism for correcting the inclination of the optical axis L are provided separately. Therefore, the cost of the lens driving device 1 can be reduced.
  • the inclination of the optical axis L can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet units 11 and the four driving coils 12. For this reason, when shake such as camera shake occurs in the camera in which the lens driving device 1 is mounted, it is also possible to correct this shake.
  • the four drive magnet portions 11 and the four drive coils 12 are arranged in a rotational symmetry of about 90 ° with the optical axis L as the center. Therefore, when correcting the inclination of the optical axis L, it is relatively easy to adjust the balance of the driving forces generated between the four driving magnet units 11 and the four driving coils 12. Therefore, in this embodiment, it is possible to more appropriately correct the inclination of the optical axis L. In this embodiment, the control by the control unit 21 when correcting the inclination of the optical axis L is facilitated.
  • the opposing surfaces of the two drive magnet pieces 13 and 14 arranged so as to overlap in the optical axis direction are both magnetized to the same magnetic pole. Therefore, it is possible to increase the density of the magnetic flux passing through the driving coil 12 between the opposing surfaces of the two driving magnet pieces 13 and 14. Therefore, the magnetic circuit for driving the movable body 2 can be formed more efficiently, and the driving force generated in each of the four driving magnet portions 11 and the four driving coils 12 can be increased. Can do. As a result, in this embodiment, it is possible to improve the responsiveness when correcting the inclination of the optical axis L, and it is possible to effectively suppress the inclination of the optical axis L.
  • the magnitude of the current supplied to each of the drive coils 12A and 12C arranged substantially point-symmetrically with respect to the optical axis L is controlled by the first current control unit 41, and the optical axis L is controlled.
  • the magnitude of the current supplied to each of the drive coils 12 ⁇ / b> B and 12 ⁇ / b> D arranged approximately point-symmetrically is controlled by the second current control unit 42. Therefore, the inclination of the optical axis L with the second direction W as the axial direction is corrected by the driving coils 12A and 12C, and the inclination of the optical axis L with the first direction V as the axial direction is corrected by the driving coils 12B and 12D. Can be corrected. Therefore, in the present embodiment, the four driving coils 12 can correct the inclination of the optical axis L in all directions.
  • the senor 10 is fixed to the movable body 2. Therefore, the inclination of the optical axis L of the lens held by the movable body 2 can be directly detected by the sensor 10. Therefore, in this embodiment, the inclination of the optical axis L can be corrected in real time by correcting the inclination of the optical axis L based on the detection result of the sensor 10.
  • the senor 10 is arranged between two drive coils 12 adjacent in the circumferential direction. Therefore, the sensor 10 can be arranged using the space between the two drive coils 12 that are likely to become a dead space. Therefore, in this embodiment, the lens driving device 1 can be reduced in size.
  • the drive coil 12A is connected to the current supply circuit 24, the drive coil 12C is connected to the current supply circuit 25, the drive coil 12B is connected to the current supply circuit 26, and the drive coil 12D is the current.
  • the supply circuit 27 is connected.
  • the drive coil 12A is connected to the current supply circuit 24, the drive coil 12B is connected to the current supply circuit 25, the drive coil 12C is connected to the current supply circuit 26, and the drive coil 12D is It may be connected to the current supply circuit 27.
  • this configuration it is possible to correct the inclination of the optical axis L with the Y direction as the axial direction. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the Y direction as an axial direction, this configuration can suppress the inclination of the optical axis L. become.
  • the drive coil 12A is connected to the current supply circuit 24, the drive coil 12D is connected to the current supply circuit 25, the drive coil 12B is connected to the current supply circuit 26, and the drive coil 12C is connected to the current supply circuit 27. May be connected. If comprised in this way, the inclination of the optical axis L which makes an X direction an axial direction can be correct
  • the first current control unit 41 is configured so that each of the two driving coils 12 ⁇ / b> A and 12 ⁇ / b> B or the driving coils 12 ⁇ / b> A and 12 ⁇ / b> D adjacent in the circumferential direction is present.
  • the second current control unit 42 supplies the remaining two driving coils 12C and 12D or the driving coils 12B and 12C to the third current control unit that controls the magnitude of the current supplied to
  • the fourth current control unit controls the magnitude of the current to be generated.
  • the differential output amplifier 32 is disposed between the inclination correction control unit 23 and the adders 28 and 29, and the differential output amplifier 33 is disposed between the inclination correction control unit 23 and the adders 30 and 31.
  • the inclination correction control unit 23 and the adders 28 to 31 may be directly connected.
  • the four drive magnet portions 11 and the four drive coils 12 are arranged at the four corners of the lens drive device 1.
  • two driving magnet portions 11 and two driving coils 12 are arranged at a substantially intermediate position in the X direction on the outer peripheral side of the movable body 2, and Y on the outer peripheral side of the movable body 2 is arranged.
  • Two drive magnet portions 11 and two drive coils 12 may be arranged at a substantially intermediate position in the direction.
  • the four drive magnet portions 11 and the four drive coils 12 do not have to be arranged with a rotational symmetry of about 90 ° about the optical axis L.
  • the four driving magnet portions 11 and the four driving coils 12 are arranged so as not to overlap each other when viewed from the optical axis direction, the inclination of the optical axis L can be suppressed. It is possible to obtain the above-described effects.
  • the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square.
  • the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is substantially rectangular or trapezoidal.
  • the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is a substantially polygonal shape other than the substantially square shape, or the shape when viewed from the optical axis direction is a substantially circular shape. Or you may form so that it may become a substantially ellipse shape.
  • the drive magnet portion 11 is formed in a substantially triangular prism shape.
  • the drive magnet portion 11 may be formed in a substantially polygonal column shape other than a substantially triangular prism shape, a substantially cylindrical shape, or a substantially elliptical column shape. May be formed.
  • the driving coil 12 is wound in a substantially triangular cylindrical shape.
  • the driving coil 12 may be wound in a substantially polygonal cylindrical shape other than the substantially triangular cylindrical shape, or a substantially cylindrical shape. It may be wound in a shape or a substantially oval cylindrical shape.
  • the magnetic plate 15 is disposed between the opposing surfaces of the drive magnet pieces 13 and 14.
  • the magnetic plate 15 may not be disposed between the facing surfaces of the driving magnet pieces 13 and 14, and a gap may be formed between the facing surfaces of the driving magnet pieces 13 and 14. And the opposing surface of the magnet pieces 13 for drive and 14 may contact
  • the driving magnet unit 11 is constituted by the two driving magnet pieces 13 and 14 and the magnetic plate 15, but the driving magnet unit 11 is a single driving magnet piece. It may be constituted only by. In this case, the driving magnet pieces are magnetized so that the magnetic poles formed at both ends in the optical axis direction are different from the magnetic poles formed at intermediate positions in the optical axis direction.
  • the senor 10 is a two-axis gyroscope capable of detecting an inclination with two directions orthogonal to each other as directions of the rotation axis.
  • the sensor 10 may be a single-axis gyroscope capable of detecting an inclination with one direction as the direction of the rotation axis.
  • two sensors 10 are fixed to the sleeve 6.
  • one sensor 10 is fixed to the sleeve 6 between the driving coil 12B and the driving coil 12C, and the other sensor 10 is connected to the sleeve between the driving coil 12C and the driving coil 12D. 6 is fixed.
  • the sensor 10 may be a three-axis gyroscope capable of detecting an inclination with three directions orthogonal to each other as directions of rotation axes.
  • the sleeve 6 is fixed to the sleeve 6, but the sensor 10 may be fixed to the fixed body 3.
  • the sensor 10 may be fixed to the inner peripheral surface of the cylindrical portion 7 b of the first case body 7.
  • the sensor 10 is preferably disposed between two driving coils 12 adjacent in the circumferential direction.
  • the inclination of the optical axis L is corrected by changing the magnitude of the current supplied to the four drive coils 12.
  • the inclination of the optical axis L may be corrected by changing the direction of the current supplied to the four drive coils 12.
  • the movable body 2 is moved in the optical axis direction using the driving coil 12 and the inclination of the movable body 2 is corrected.
  • a driving coil for moving the movable body 2 in the optical axis direction is separately wound around the outer peripheral surface of the sleeve 6, and the movable body 2 is moved in the optical axis direction using the driving coil.
  • the driving coil 12 may be used only for correcting the inclination of the movable body 2.
  • the driving coil 12 is fixed on the movable body 2 side and the driving magnet section 11 is fixed on the fixed body 3 side, but the driving magnet section 11 is fixed and fixed on the movable body 2 side.
  • the driving coil 12 may be fixed to the body 3 side.
  • each of the drive coils 12A to 12D is connected to each of the current supply circuits 24 to 27.
  • the driving coil 12A and the driving coil 12D are connected in series and connected to the current supply circuit 24, and the driving coil 12B and the driving coil 12C are connected in series and supplied with current. It may be connected to the circuit 25.
  • the drive coil 12A and the drive coil 12D are formed by sequentially winding one conductive wire and connected to the current supply circuit 24, and the drive coil 12B and the drive coil 12C are one. These conductors may be formed by being sequentially wound and connected to the current supply circuit 25.
  • this configuration it is possible to correct the inclination of the optical axis L with the Y direction as the axial direction. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the Y direction as an axial direction, this configuration can suppress the inclination of the optical axis L. become.
  • the drive coil 12A and the drive coil 12B are connected in series and connected to the current supply circuit 24, and the drive coil 12C and the drive coil 12D are connected in series and connected to the current supply circuit 25. It may be connected.
  • the drive coil 12A and the drive coil 12B are formed by sequentially winding one conductive wire and connected to the current supply circuit 24, and the drive coil 12C and the drive coil 12D are one. These conductors may be formed by being sequentially wound, and may be connected to the current supply circuit 25.
  • the configuration of the configuration can suppress the inclination of the optical axis L. become.

Abstract

A lens drive device wherein the tilt of the optical axis of the lens is minimized. A lens drive device is provided with a movable body which can move in the optical axis direction while holding the lens, and a drive mechanism (4) which drives the movable body. The drive mechanism (4) is provided with four driving magnet sections (11) which are formed in a substantially columnar shape, and four driving coils (12) which are formed by being wound in a substantially tubular shape. The four driving magnet sections (11) are arranged in such a manner that the longitudinal direction thereof is substantially parallel to the optical axis direction and that the driving magnet sections (11) are not overlapped with each other when viewed in the optical axis direction. Each of the four driving coils (12) is disposed in such a manner that the inner peripheral surface of the driving coil (12) faces each of the outer peripheral surfaces of the four driving magnet sections (11) with a predetermined spacing therebetween. The driving magnet sections (11) are magnetized so that magnetic fluxes which pass through the driving coils (12) are generated at positions at which the driving magnet sections (11) face the driving coils (12). The four driving coils (12) are each formed by winding a conductive wire.

Description

レンズ駆動装置Lens drive device
　本発明は、携帯電話等で使用される比較的小型のカメラに搭載されるレンズ駆動装置に関する。 The present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like.
　従来、携帯電話等で使用されるカメラの撮影用レンズを駆動するレンズ駆動装置として、複数のレンズを保持して光軸方向に移動する移動レンズ体と、２枚の板バネを介して移動レンズ体を移動可能に保持する固定体とを備えるレンズ駆動装置が知られている（たとえば、特許文献１参照）。この特許文献１に記載のレンズ駆動装置では、移動レンズ体を構成する円筒状のスリーブの外周に駆動用コイルが巻回されている。また、このレンズ駆動装置では、駆動用コイルの外周面に対向するように、４個の磁石が配置されている。 2. Description of the Related Art Conventionally, as a lens driving device for driving a photographing lens of a camera used in a mobile phone or the like, a moving lens body that moves in the optical axis direction while holding a plurality of lenses, and a moving lens through two leaf springs 2. Description of the Related Art A lens driving device including a fixed body that holds a body in a movable manner is known (see, for example, Patent Document 1). In the lens driving device described in Patent Document 1, a driving coil is wound around the outer periphery of a cylindrical sleeve constituting a moving lens body. In this lens driving device, four magnets are arranged so as to face the outer peripheral surface of the driving coil.
特開２００８－５８６５９号公報JP 2008-58659 A
　近年、携帯電話等に使用されるカメラの市場では、高画素化の要求が一段と高まっており、かかる高画素化の要求に応えるため、カメラに搭載されるレンズの光軸の傾き量（チルト量）の許容範囲がしだいに狭くなっている。 In recent years, in the market of cameras used for mobile phones and the like, the demand for higher pixels has increased further, and in order to meet the demand for higher pixels, the tilt amount (tilt amount) of the lens mounted on the camera ) Is gradually becoming narrower.
　そこで、本発明の課題は、レンズの光軸の傾きを抑制することが可能なレンズ駆動装置を提供することにある。 Therefore, an object of the present invention is to provide a lens driving device capable of suppressing the inclination of the optical axis of the lens.
　上記の課題を解決するため、本発明のレンズ駆動装置は、レンズを保持しレンズの光軸方向へ移動可能な可動体と、可動体を駆動するための駆動機構とを備え、駆動機構は、略柱状に形成される４個の駆動用磁石部と、略筒状に巻回されて形成される４個の駆動用コイルとを備え、４個の駆動用磁石部は、その長手方向が光軸方向と略平行になるように配置されるとともに、光軸方向から見たときに互いに重ならない位置に配置され、４個の駆動用コイルのそれぞれは、その内周面が４個の駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、駆動用磁石部は、駆動用コイルとの対向位置で駆動用コイルを通過する磁束が発生するように着磁され、４個の駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されていることを特徴とする。 In order to solve the above-described problem, a lens driving device of the present invention includes a movable body that holds a lens and is movable in the optical axis direction of the lens, and a drive mechanism for driving the movable body. Four drive magnet portions formed in a substantially column shape and four drive coils formed in a substantially cylindrical shape are provided, and the four drive magnet portions are light in the longitudinal direction. The four driving coils are arranged so as to be substantially parallel to the axial direction and do not overlap each other when viewed from the optical axis direction, and each of the four driving coils has four inner peripheral surfaces for driving. It is arranged so as to face each of the outer peripheral surfaces of the magnet part via a predetermined gap, and the driving magnet part is magnetized so that a magnetic flux passing through the driving coil is generated at a position facing the driving coil. Each of the four drive coils is wound by each of the four conductors. Characterized in that it is formed by.
　本発明のレンズ駆動装置では、略筒状に巻回された４個の駆動用コイルのそれぞれは、その内周面が４個の駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、かつ、駆動用磁石部は、その長手方向が光軸方向と略平行になるように配置されるとともに、駆動用コイルとの対向位置で駆動用コイルを通過する磁束が発生するように着磁されている。そのため、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに光軸方向への駆動力が生じる。また、本発明では、４個の駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されている。そのため、４個の駆動用コイルに供給される電流の大きさや電流の方向を制御することで、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに生じる駆動力の大きさを変えることができる。さらに、本発明では、４個の駆動用磁石部は、光軸方向から見たときに互いに重ならない位置に配置されている。そのため、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに生じる駆動力の大きさを変えることで、レンズの光軸の傾きを補正することが可能になる。したがって、本発明では、レンズの光軸の傾きを適切に補正することで、レンズの光軸の傾きを抑制することが可能になる。また、本発明では、レンズの光軸の傾きを補正することが可能になるため、レンズ駆動装置が搭載されるカメラで振れが生じた場合に、この振れを補正することが可能になる。 In the lens driving device according to the present invention, each of the four driving coils wound in a substantially cylindrical shape has an inner peripheral surface that is in contact with each of the outer peripheral surfaces of the four driving magnet portions via a predetermined gap. The driving magnet portion is disposed so as to face the driving magnet portion so that the longitudinal direction thereof is substantially parallel to the optical axis direction, and magnetic flux passing through the driving coil at a position facing the driving coil. It is magnetized to occur. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet portions and the four driving coils. In the present invention, each of the four drive coils is formed by winding each of the four conductive wires. Therefore, by controlling the magnitude and direction of the current supplied to the four driving coils, the magnitude of the driving force generated between each of the four driving magnets and the four driving coils is controlled. You can change that. Furthermore, in the present invention, the four drive magnet portions are arranged at positions that do not overlap each other when viewed from the optical axis direction. Therefore, the inclination of the optical axis of the lens can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet units and the four driving coils. Therefore, in the present invention, it is possible to suppress the inclination of the optical axis of the lens by appropriately correcting the inclination of the optical axis of the lens. In the present invention, since it is possible to correct the tilt of the optical axis of the lens, it is possible to correct this shake when shake occurs in the camera in which the lens driving device is mounted.
　なお、本発明では、可動体が光軸方向へ移動する際に生じる光軸の傾きを補正することが可能であるとともに、レンズ駆動装置の組立誤差等によって生じた光軸の傾きを補正することも可能である。 In the present invention, it is possible to correct the inclination of the optical axis generated when the movable body moves in the optical axis direction, and to correct the inclination of the optical axis caused by an assembly error of the lens driving device. Is also possible.
　本発明において、４個の駆動用磁石部および４個の駆動用コイルは、レンズの光軸を略中心にして略９０°の回転対称で配置されていることが好ましい。このように構成すると、レンズの光軸の傾きを補正する際の、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに生じる駆動力のバランスの調整が比較的容易になる。したがって、レンズの光軸の傾きをより適切に補正することが可能になる。 In the present invention, it is preferable that the four drive magnet portions and the four drive coils are arranged in a rotational symmetry of about 90 ° about the optical axis of the lens. With this configuration, when correcting the inclination of the optical axis of the lens, it is relatively easy to adjust the balance of driving forces generated between the four driving magnet units and the four driving coils. Become. Therefore, it is possible to more appropriately correct the inclination of the optical axis of the lens.
　本発明において、駆動用磁石部は、光軸方向で重なるように配置される略柱状の２個の駆動用磁石片を備え、光軸方向における２個の駆動用磁石片同士の対向面はいずれも、同じ磁極に着磁されていることが好ましい。このように構成すると、２個の駆動用磁石片同士の対向面の間において、駆動用コイルを通過する磁束の密度を高めることができる。したがって、可動体を駆動するための磁気回路をより効率良く形成することができ、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに生じる駆動力を高めることができる。その結果、レンズの光軸の傾きを補正する際の応答性を高めることが可能になり、レンズの光軸の傾きを効果的に抑制することが可能になる。 In the present invention, the drive magnet portion includes two substantially columnar drive magnet pieces arranged so as to overlap in the optical axis direction, and the opposing surfaces of the two drive magnet pieces in the optical axis direction are any However, the same magnetic pole is preferably magnetized. If comprised in this way, between the opposing surfaces of two drive magnet pieces, the density of the magnetic flux which passes a drive coil can be raised. Therefore, a magnetic circuit for driving the movable body can be formed more efficiently, and the driving force generated in each of the four drive magnet portions and the four drive coils can be increased. As a result, it is possible to improve the responsiveness when correcting the tilt of the optical axis of the lens, and to effectively suppress the tilt of the optical axis of the lens.
　本発明において、レンズ駆動装置は、レンズの光軸の傾きを検出するためのセンサを備え、センサは、可動体に取り付けられていることが好ましい。このように構成すると、レンズの光軸の傾きをセンサで直接的に検出することができる。したがって、センサでの検出結果に基づいて、レンズの光軸の傾きを補正することで、リアルタイムでレンズの光軸の傾きを補正することが可能になる。 In the present invention, the lens driving device preferably includes a sensor for detecting the inclination of the optical axis of the lens, and the sensor is preferably attached to the movable body. If comprised in this way, the inclination of the optical axis of a lens can be directly detected with a sensor. Therefore, it is possible to correct the inclination of the optical axis of the lens in real time by correcting the inclination of the optical axis of the lens based on the detection result of the sensor.
　本発明において、レンズ駆動装置は、可動体を光軸方向へ移動可能に保持する固定体と、レンズの光軸の傾きを検出するためのセンサとを備え、センサは、固定体に取り付けられても良い。 In the present invention, the lens driving device includes a fixed body that holds the movable body so as to be movable in the optical axis direction, and a sensor for detecting the inclination of the optical axis of the lens, and the sensor is attached to the fixed body. Also good.
　本発明において、センサは、レンズ駆動装置の周方向で隣り合う駆動用コイルの間に配置されていることが好ましい。このように構成すると、デッドスペースとなりやすい駆動用コイルの間を利用してセンサを配置することができる。したがって、レンズ駆動装置を小型化することが可能になる。 In the present invention, the sensor is preferably disposed between adjacent drive coils in the circumferential direction of the lens driving device. If comprised in this way, a sensor can be arrange | positioned using between the coils for a drive which tends to become a dead space. Therefore, it is possible to reduce the size of the lens driving device.
　本発明において、レンズ駆動装置は、光軸方向から見たときの形状が略長方形状または略正方形状となる略四角柱状に形成されるとともに、駆動機構を制御するための制御部を備え、４個の駆動用磁石部および４個の駆動用コイルのそれぞれは、レンズ駆動装置の四隅のそれぞれに配置され、制御部は、センサからの出力結果に基づいて、４個の駆動用コイルのうちの、レンズの光軸に対して略点対称に配置される２個の駆動用コイルのそれぞれに供給される電流の大きさを制御する第１電流制御部と、センサからの出力結果に基づいて、残りの２個の駆動用コイルのそれぞれに供給される電流の大きさを制御する第２電流制御部とを備えることが好ましい。また、この場合には、レンズ駆動装置は、光軸方向から見たときの形状が略正方形状となる略四角柱状に形成され、４個の駆動用磁石部および４個の駆動用コイルは、レンズの光軸を略中心にして略９０°の回転対称で配置されていることが好ましい。このように構成すると、第１電流制御部で制御される駆動用コイルによって、光軸方向に直交する所定の第１の方向を軸方向とするレンズの光軸の傾きを補正し、第２電流制御部で制御される駆動用コイルによって、光軸方向と第１の方向とに直交する第２の方向を軸方向とするレンズの光軸の傾きを補正することができる。したがって、４個の駆動用コイルによって、全方向で光軸の傾きを補正することが可能になる。 In the present invention, the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the driving mechanism. Each of the driving magnet units and the four driving coils is disposed at each of the four corners of the lens driving device, and the control unit is configured to select one of the four driving coils based on the output result from the sensor. Based on the output result from the first current control unit that controls the magnitude of the current supplied to each of the two drive coils arranged substantially point-symmetrically with respect to the optical axis of the lens, It is preferable to include a second current control unit that controls the magnitude of the current supplied to each of the remaining two drive coils. Further, in this case, the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially square shape, and the four driving magnet portions and the four driving coils are: It is preferable that the optical axis of the lens is arranged in a rotational symmetry of about 90 ° about the optical axis. With this configuration, the tilt of the optical axis of the lens with the predetermined first direction orthogonal to the optical axis direction as the axial direction is corrected by the driving coil controlled by the first current control unit, and the second current The drive coil controlled by the control unit can correct the inclination of the optical axis of the lens with the second direction orthogonal to the optical axis direction and the first direction as the axial direction. Therefore, the four driving coils can correct the inclination of the optical axis in all directions.
　本発明において、レンズ駆動装置は、光軸方向から見たときの形状が略長方形状または略正方形状となる略四角柱状に形成されるとともに、駆動機構を制御するための制御部を備え、４個の駆動用磁石部および４個の駆動用コイルのそれぞれは、レンズ駆動装置の四隅のそれぞれに配置され、制御部は、センサからの出力結果に基づいて、４個の駆動用コイルのうちの、レンズ駆動装置の周方向で隣り合う２個の駆動用コイルのそれぞれに供給される電流の大きさを制御する第３電流制御部と、センサからの出力結果に基づいて、残りの２個の駆動用コイルのそれぞれに供給される電流の大きさを制御する第４電流制御部とを備えていても良い。この場合には、光軸方向に直交する所定の方向を軸方向とするレンズの光軸の傾きを補正することが可能になる。 In the present invention, the lens driving device is formed in a substantially quadrangular prism shape whose shape when viewed from the optical axis direction is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the driving mechanism. Each of the driving magnet units and the four driving coils is disposed at each of the four corners of the lens driving device, and the control unit is configured to select one of the four driving coils based on the output result from the sensor. A third current control unit for controlling the magnitude of the current supplied to each of the two driving coils adjacent in the circumferential direction of the lens driving device, and the remaining two based on the output result from the sensor You may provide the 4th electric current control part which controls the magnitude | size of the electric current supplied to each of the coil for a drive. In this case, it is possible to correct the inclination of the optical axis of the lens whose axial direction is a predetermined direction orthogonal to the optical axis direction.
　また、上記の課題を解決するため、本発明のレンズ駆動装置は、レンズの光軸方向から見たときの形状が略長方形状または略正方形状となるレンズ駆動装置であって、レンズを保持し光軸方向へ移動可能な可動体と、可動体を駆動するための駆動機構とを備え、駆動機構は、レンズ駆動装置の四隅のそれぞれに配置される略柱状の４個の駆動用磁石部と、略筒状に巻回されて形成される４個の駆動用コイルとを備え、４個の駆動用磁石部は、その長手方向が光軸方向と略平行になるように配置され、４個の駆動用コイルのそれぞれは、その内周面が４個の駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、駆動用磁石部は、駆動用コイルとの対向位置で駆動用コイルを通過する磁束が発生するように着磁され、４個の駆動用コイルのうちの、レンズの光軸を中心とする周方向で隣り合うように配置される２個の駆動用コイルは、１本の導線が順次巻回されて形成され、残りの２個の駆動用コイルは、他の１本の導線が順次巻回されて形成されていること、または、４個の駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されるとともに、４個の駆動用コイルのうちの、レンズの光軸を中心とする周方向で隣り合うように配置される２個の駆動用コイルは直列に接続され、残りの２個の駆動用コイルは直列に接続されていることを特徴とする。 In order to solve the above problems, the lens driving device according to the present invention is a lens driving device having a substantially rectangular shape or a substantially square shape when viewed from the optical axis direction of the lens, and holds the lens. A movable body movable in the optical axis direction; and a drive mechanism for driving the movable body, the drive mechanism comprising four substantially columnar drive magnet portions disposed at each of the four corners of the lens drive device; And four drive coils formed by being wound in a substantially cylindrical shape, and the four drive magnet portions are arranged so that the longitudinal direction thereof is substantially parallel to the optical axis direction. Each of the driving coils is arranged so that the inner peripheral surface thereof faces each of the outer peripheral surfaces of the four driving magnet portions with a predetermined gap, and the driving magnet portion is connected to the driving coil. Magnetized to generate magnetic flux that passes through the drive coil at the opposite position. Of the four driving coils, two driving coils arranged adjacent to each other in the circumferential direction centering on the optical axis of the lens are formed by sequentially winding one conductive wire, and the rest The two driving coils are formed by sequentially winding the other one conducting wire, or each of the four driving coils is wound by each of the four conducting wires. Of the four driving coils, the two driving coils arranged adjacent to each other in the circumferential direction around the optical axis of the lens are connected in series, and the remaining two The drive coils are connected in series.
　本発明のレンズ駆動装置では、略筒状に巻回された４個の駆動用コイルのそれぞれは、その内周面が４個の駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、かつ、駆動用磁石部は、その長手方向が光軸方向と略平行になるように配置されるとともに、駆動用コイルとの対向位置で駆動用コイルを通過する磁束が発生するように着磁されている。そのため、４個の駆動用磁石部と４個の駆動用コイルとの間のそれぞれに光軸方向への駆動力が生じる。また、本発明では、４個の駆動用コイルのうちの、レンズの光軸を中心とする周方向で隣り合うように配置される２個の駆動用コイルは、１本の導線が順次巻回されて形成され、残りの２個の駆動用コイルは、他の１本の導線が順次巻回されて形成されている。または、４個の駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されるとともに、４個の駆動用コイルのうちの、レンズの光軸を中心とする周方向で隣り合うように配置される２個の駆動用コイルは直列に接続され、残りの２個の駆動用コイルは直列に接続されている。そのため、駆動用コイルに供給される電流の大きさや電流の方向を制御することで、周方向で隣り合う２個の駆動用磁石部と駆動用コイルとの間に生じる駆動力の大きさと、他の２個の駆動用磁石部と駆動用コイルとの間に生じる駆動力の大きさとを変えることができる。さらに、本発明では、４個の駆動用磁石部および４個の駆動用コイルのそれぞれは、光軸方向から見たときの形状が略長方形状または略正方形状となるレンズ駆動装置の四隅のそれぞれに配置されている。そのため、周方向で隣り合う２個の駆動用磁石部と駆動用コイルとの間に生じる駆動力の大きさと、他の２個の駆動用磁石部と駆動用コイルとの間に生じる駆動力の大きさとを変えることで、光軸方向の直交する所定の方向を軸方向とするレンズの光軸の傾きを補正することが可能になる。その結果、本発明では、レンズの光軸の傾きを適切に補正することで、レンズの光軸の傾きを抑制することが可能になる。 In the lens driving device according to the present invention, each of the four driving coils wound in a substantially cylindrical shape has an inner peripheral surface that is in contact with each of the outer peripheral surfaces of the four driving magnet portions via a predetermined gap. The driving magnet portion is disposed so as to face the driving magnet portion so that the longitudinal direction thereof is substantially parallel to the optical axis direction, and magnetic flux passing through the driving coil at a position facing the driving coil. It is magnetized to occur. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet portions and the four driving coils. In the present invention, of the four driving coils, one of the four driving coils arranged so as to be adjacent to each other in the circumferential direction centered on the optical axis of the lens is sequentially wound by one conductive wire. The remaining two driving coils are formed by sequentially winding another one conducting wire. Alternatively, each of the four driving coils is formed by winding each of the four conductive wires, and is adjacent to each other in the circumferential direction around the optical axis of the lens among the four driving coils. The two driving coils arranged so as to fit with each other are connected in series, and the remaining two driving coils are connected in series. Therefore, by controlling the magnitude of the current supplied to the driving coil and the direction of the current, the magnitude of the driving force generated between the two driving magnet parts adjacent to each other in the circumferential direction and the driving coil, and the like The magnitude of the driving force generated between the two driving magnet portions and the driving coil can be changed. Furthermore, in the present invention, each of the four drive magnet portions and the four drive coils has four corners of the lens drive device that are substantially rectangular or square when viewed from the optical axis direction. Is arranged. Therefore, the magnitude of the driving force generated between the two driving magnet portions and the driving coil adjacent in the circumferential direction and the driving force generated between the other two driving magnet portions and the driving coil are reduced. By changing the size, it is possible to correct the inclination of the optical axis of the lens whose axial direction is a predetermined direction orthogonal to the optical axis direction. As a result, in the present invention, it is possible to suppress the inclination of the optical axis of the lens by appropriately correcting the inclination of the optical axis of the lens.
　以上のように、本発明のレンズ駆動装置では、レンズの光軸の傾きを抑制することが可能になる。 As described above, in the lens driving device of the present invention, it is possible to suppress the tilt of the optical axis of the lens.
本発明の実施の形態にかかるレンズ駆動装置の斜視図である。It is a perspective view of the lens drive device concerning an embodiment of the invention. 図１のＥ－Ｅ断面の断面図である。FIG. 2 is a cross-sectional view taken along a line EE in FIG. 1. 図１に示すレンズ駆動装置の要部の分解斜視図である。It is a disassembled perspective view of the principal part of the lens drive device shown in FIG. 図３に示す４個の駆動用磁石部および４個の駆動用コイルの配置を説明するための平面図である。FIG. 4 is a plan view for explaining the arrangement of four drive magnet units and four drive coils shown in FIG. 3. 図３に示す駆動用磁石部および駆動用コイルの側面図である。FIG. 4 is a side view of the drive magnet unit and the drive coil shown in FIG. 3. 図５のＧ－Ｇ方向から駆動用磁石片および駆動用コイルを示す図である。FIG. 6 is a diagram showing a driving magnet piece and a driving coil from the GG direction of FIG. 5. 図２に示す駆動機構の制御部およびその周辺部分の構成を示す回路図である。FIG. 3 is a circuit diagram illustrating a configuration of a control unit and its peripheral part of the drive mechanism shown in FIG. 2.
　１　レンズ駆動装置
　２　可動体
　３　固定体
　４　駆動機構
　１０　センサ
　１１　駆動用磁石部
　１２（１２Ａ～１２Ｄ）　駆動用コイル
　１３、１４　駆動用磁石片
　２１　制御部
　４１　第１電流制御部
　４２　第２電流制御部
　Ｌ　光軸 DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 10 Sensor 11 Drive magnet part 12 (12A-12D) Drive coil 13, 14 Drive magnet piece 21 Control part 41 1st current control part 42 2nd current control Part L Optical axis
　以下、図面を参照しながら、本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　（レンズ駆動装置の概略構成）
　図１は、本発明の実施の形態にかかるレンズ駆動装置１の斜視図である。図２は、図１のＥ－Ｅ断面の断面図である。図３は、図１に示すレンズ駆動装置１の要部の分解斜視図である。 (Schematic configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of a main part of the lens driving device 1 shown in FIG.
　本形態のレンズ駆動装置１は、携帯電話等で使用される比較的小型のカメラに搭載されるものであり、図１に示すように、全体として略四角柱状に形成されている。すなわち、レンズ駆動装置１は、撮影用のレンズの光軸Ｌの方向（光軸方向）から見たときの形状が略四角形状となるように形成されている。本形態では、レンズ駆動装置１は、光軸方向から見たときの形状が略正方形状となるように形成されている。 The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. That is, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. In this embodiment, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square.
　なお、本形態のレンズ駆動装置１が搭載されるカメラでは、図２の下側（すなわち、Ｚ２方向側）に図示を省略する撮像素子が配置されており、図２の上側（すなわち、Ｚ１方向側）に配置される被写体が撮影される。したがって、以下の説明では、Ｚ１方向側を被写体側（物体側）、Ｚ２方向側を反被写体側（撮像素子側、像側）とする。また、以下の説明では、光軸Ｌに直交するとともに互いに直交する２方向をＸ方向、Ｙ方向とする。また、Ｘ方向とＹ方向とから形成される平面をＸＹ平面とする。本形態では、レンズ駆動装置１の４つの側面は、Ｘ方向またはＹ方向と平行になっている。 In the camera in which the lens driving device 1 according to this embodiment is mounted, an image sensor (not shown) is arranged on the lower side in FIG. 2 (that is, the Z2 direction side), and the upper side in FIG. 2 (that is, the Z1 direction). The subject placed on the side) is photographed. Therefore, in the following description, the Z1 direction side is the subject side (object side), and the Z2 direction side is the anti-subject side (imaging element side, image side). In the following description, two directions orthogonal to the optical axis L and orthogonal to each other are defined as an X direction and a Y direction. A plane formed from the X direction and the Y direction is defined as an XY plane. In this embodiment, the four side surfaces of the lens driving device 1 are parallel to the X direction or the Y direction.
　レンズ駆動装置１は、図１～図３に示すように、撮影用のレンズを保持し光軸方向へ移動可能な可動体２と、可動体２を光軸方向へ移動可能に保持する固定体３と、可動体２を光軸方向へ駆動するための駆動機構４とを備えている。また、レンズ駆動装置１は、レンズの光軸Ｌの傾きを検出するためのセンサ１０を備えている。 As shown in FIGS. 1 to 3, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction. The lens driving device 1 also includes a sensor 10 for detecting the inclination of the optical axis L of the lens.
　可動体２は、複数のレンズが固定されたレンズホルダ５を保持するスリーブ６を備えている。レンズホルダ５は、略円筒状に形成されており、その内周側に複数のレンズが固定されている。レンズホルダ５の外周面には、オネジが形成されている。スリーブ６は、略円筒状に形成されており、その内周側でレンズホルダ５を保持している。すなわち、スリーブ６の内周面には、レンズホルダ５の外周面に形成されるオネジと係合するメネジが形成されている。また、スリーブ６の被写体側端および反被写体側端には、図示を省略する板バネの一部が固定されている。この板バネの他の一部は、固定体３に固定されており、可動体２は、板バネを介して、固定体３に保持されている。 The movable body 2 includes a sleeve 6 that holds a lens holder 5 to which a plurality of lenses are fixed. The lens holder 5 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed on the inner peripheral side thereof. A male screw is formed on the outer peripheral surface of the lens holder 5. The sleeve 6 is formed in a substantially cylindrical shape, and holds the lens holder 5 on the inner peripheral side thereof. That is, a female screw that engages with a male screw formed on the outer peripheral surface of the lens holder 5 is formed on the inner peripheral surface of the sleeve 6. A part of a leaf spring (not shown) is fixed to the subject side end and the non-subject side end of the sleeve 6. Another part of the leaf spring is fixed to the fixed body 3, and the movable body 2 is held by the fixed body 3 via the leaf spring.
　固定体３は、被写体側に配置される第１ケース体７と、反被写体側に配置される第２ケース体８とを備えている。第１ケース体７は、磁性材料で形成されるとともに、底部７ａと筒部７ｂとを有する底付きの略四角筒状に形成されている。被写体側に配置される底部７ａの中心には、円形の貫通孔７ｃが形成されている。第１ケース体７は、可動体２および駆動機構４の外周側を囲むように配置されている。第２ケース体８は、たとえば、樹脂材料で形成されるとともに、略四角筒状に形成されている。この第２ケース体８は、レンズホルダ５の反被写体側の外周側を覆うように、第１ケース体７の反被写体側端に取り付けられている。 The fixed body 3 includes a first case body 7 disposed on the subject side and a second case body 8 disposed on the opposite subject side. The first case body 7 is formed of a magnetic material, and is formed in a substantially square cylindrical shape with a bottom having a bottom portion 7a and a cylindrical portion 7b. A circular through hole 7c is formed at the center of the bottom 7a arranged on the subject side. The first case body 7 is disposed so as to surround the outer peripheral side of the movable body 2 and the drive mechanism 4. For example, the second case body 8 is formed of a resin material and is formed in a substantially rectangular tube shape. The second case body 8 is attached to the anti-subject side end of the first case body 7 so as to cover the outer peripheral side of the lens holder 5 on the anti-subject side.
　駆動機構４は、略三角柱状に形成される４個の駆動用磁石部１１と、略三角筒状に巻回されて形成される４個の駆動用コイル１２とを備えている。以下、この駆動機構４の構成およびセンサ１０の構成について説明する。 The drive mechanism 4 includes four drive magnet portions 11 formed in a substantially triangular prism shape, and four drive coils 12 formed in a substantially triangular tube shape. Hereinafter, the configuration of the drive mechanism 4 and the configuration of the sensor 10 will be described.
　（駆動機構の構成、センサの構成）
　図４は、図３に示す４個の駆動用磁石部１１および４個の駆動用コイル１２の配置を説明するための平面図である。図５は、図３に示す駆動用磁石部１１および駆動用コイル１２の側面図である。図６は、図５のＧ－Ｇ方向から駆動用磁石片１４および駆動用コイル１２を示す図である。 (Drive mechanism configuration, sensor configuration)
FIG. 4 is a plan view for explaining the arrangement of the four drive magnet portions 11 and the four drive coils 12 shown in FIG. FIG. 5 is a side view of the drive magnet unit 11 and the drive coil 12 shown in FIG. FIG. 6 is a diagram showing the driving magnet piece 14 and the driving coil 12 from the GG direction of FIG.
　４個の駆動用磁石部１１は、上述のように、略三角柱状に形成されており、その長手方向が光軸方向と略平行になるように、レンズ駆動装置１の四隅（具体的には、第１ケース体７の内側の四隅）のそれぞれに配置されている。また、４個の駆動用コイル１２は、上述のように、略三角筒状に形成されており、その内周面が４個の駆動用磁石部１１の外周面のそれぞれと所定の隙間を介して対向するように配置されている。 As described above, the four driving magnet portions 11 are formed in a substantially triangular prism shape, and the four corners (specifically, the longitudinal direction of the lens driving device 1 is set to be substantially parallel to the optical axis direction). The four corners on the inner side of the first case body 7 are disposed. Further, as described above, the four driving coils 12 are formed in a substantially triangular cylindrical shape, and the inner peripheral surface thereof is in contact with each of the outer peripheral surfaces of the four driving magnet portions 11 via a predetermined gap. Are arranged to face each other.
　本形態のレンズ駆動装置１は、上述のように、光軸方向から見たときの形状が略正方形状となるように形成されている。そのため、本形態では、４個の駆動用磁石部１１および４個の駆動用コイル１２は、図４に示すように、光軸Ｌを略中心にして略９０°の回転対称に配置されている。 As described above, the lens driving device 1 of the present embodiment is formed so that the shape when viewed from the optical axis direction is a substantially square shape. Therefore, in the present embodiment, the four drive magnet portions 11 and the four drive coils 12 are arranged in a rotational symmetry of about 90 ° with the optical axis L as the center as shown in FIG. .
　駆動用磁石部１１は、光軸方向で重なるように配置される略三角柱状の２個の駆動用磁石片１３、１４と、駆動用磁石片１３、１４の間に配置される略三角形状の磁性板１５とを備えている。本形態では、駆動用磁石片１３が被写体側に配置され、駆動用磁石片１４が反被写体側に配置されている。また、駆動用磁石片１３の反被写体側の端面と、磁性板１５の被写体側の端面とが固定され、駆動用磁石片１４の被写体側の端面と、磁性板１５の反被写体側の端面とが固定されている。 The drive magnet unit 11 is formed in a substantially triangular shape between two drive magnet pieces 13 and 14 having a substantially triangular prism shape and arranged so as to overlap in the optical axis direction, and the drive magnet pieces 13 and 14. And a magnetic plate 15. In this embodiment, the driving magnet piece 13 is disposed on the subject side, and the driving magnet piece 14 is disposed on the opposite subject side. Further, the end surface on the opposite side of the driving magnet piece 13 and the end surface on the subject side of the magnetic plate 15 are fixed, and the end surface on the subject side of the driving magnet piece 14 and the end surface of the magnetic plate 15 on the opposite side of the subject. Is fixed.
　駆動用磁石片１３、１４は、光軸方向から見たときの形状が略直角二等辺三角形となるように形成されており、駆動用磁石片１３、１４は、光軸方向から見たときに、その斜辺を除く２辺が第１ケース体７の筒部７ｂの内周面と略平行になるように配置されている。すなわち、光軸方向から見たときに、対角線上に配置される駆動用磁石片１３、１４の斜辺同士が互いに対向するように、駆動用磁石片１３、１４が配置されている。磁性板１５は、磁性材料で形成されている。この磁性板１５は、光軸方向から見たときの形状が駆動用磁石片１３、１４と同様の略直角三角形状となる平板状に形成されている。 The driving magnet pieces 13 and 14 are formed so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle, and the driving magnet pieces 13 and 14 are viewed when viewed from the optical axis direction. The two sides excluding the hypotenuse are arranged so as to be substantially parallel to the inner peripheral surface of the cylindrical portion 7 b of the first case body 7. That is, the driving magnet pieces 13 and 14 are arranged so that the oblique sides of the driving magnet pieces 13 and 14 arranged on the diagonal line face each other when viewed from the optical axis direction. The magnetic plate 15 is made of a magnetic material. The magnetic plate 15 is formed in a flat plate shape whose shape when viewed from the optical axis direction is substantially a right triangle similar to the driving magnet pieces 13 and 14.
　駆動用磁石片１３は、第１ケース体７の底部７ａに固定されている。具体的には、駆動用磁石片１３の被写体側の端面は、底部７ａの反被写体側の面に固定されており、駆動用磁石片１３の被写体側の端面は、底部７ａの反被写体側の面に当接している。４個の駆動用磁石片１４の反被写体側の端面には、磁性材料で形成された平板状の磁性板１６が固定されており、４個の駆動用磁石片１４の反被写体側の端面には、磁性板１６が当接している。磁性板１６は、第１ケース体７の筒部７ｂの内周面に当接している。 The driving magnet piece 13 is fixed to the bottom 7 a of the first case body 7. Specifically, the end surface on the subject side of the driving magnet piece 13 is fixed to the surface on the side opposite to the subject of the bottom portion 7a, and the end surface on the subject side of the driving magnet piece 13 is on the side opposite to the subject side of the bottom portion 7a. It is in contact with the surface. A plate-like magnetic plate 16 made of a magnetic material is fixed to the end surface of the four drive magnet pieces 14 on the side opposite to the subject, and the end face on the side opposite to the subject of the four drive magnet pieces 14 is fixed. Is in contact with the magnetic plate 16. The magnetic plate 16 is in contact with the inner peripheral surface of the cylindrical portion 7 b of the first case body 7.
　駆動用コイル１２は、図４、図６に示すように、光軸方向から見たときの形状が略直角二等辺三角形状となるように巻回されている。４個の駆動用コイル１２は、スリーブ６の外周面に固定されている。具体的には、駆動用コイル１２の内周面と駆動用磁石部１１の外周面とが所定の隙間を介して略平行になるように、光軸Ｌを中心にして略９０°ピッチで４個の駆動用コイル１２がスリーブ６の外周面に固定されており、駆動用コイル１２は、第１ケース体７の内側の四隅に配置されている。なお、駆動用コイル１２は、第１ケース体７の内周面との間に所定の隙間を保った状態で、第１ケース体７の内側の四隅に配置されており、スリーブ６とともに光軸方向へ移動可能となっている。 As shown in FIGS. 4 and 6, the driving coil 12 is wound so that the shape when viewed from the optical axis direction is a substantially right-angled isosceles triangle. The four drive coils 12 are fixed to the outer peripheral surface of the sleeve 6. Specifically, the inner circumferential surface of the driving coil 12 and the outer circumferential surface of the driving magnet unit 11 are approximately 4 at a pitch of approximately 90 ° with the optical axis L as the center so that the outer circumferential surface of the driving magnet portion 11 is substantially parallel through a predetermined gap. The drive coils 12 are fixed to the outer peripheral surface of the sleeve 6, and the drive coils 12 are arranged at the four corners inside the first case body 7. The drive coil 12 is disposed at the four corners inside the first case body 7 with predetermined gaps between the drive coil 12 and the inner peripheral surface of the first case body 7, and together with the sleeve 6, the optical axis. It can move in the direction.
　本形態では、駆動用コイル１２の反被写体側端が、駆動用磁石片１４の被写体側端よりも被写体側へ移動することがなく、かつ、駆動用コイル１２の被写体側端が、駆動用磁石片１３の反被写体側端よりも反被写体側へ移動することがないように、駆動用磁石部１１および駆動用コイル１２が形成され、配置されている。 In this embodiment, the non-subject side end of the drive coil 12 does not move to the subject side relative to the subject side end of the drive magnet piece 14, and the subject side end of the drive coil 12 is the drive magnet. The driving magnet unit 11 and the driving coil 12 are formed and arranged so as not to move to the side opposite the subject than the end on the side opposite the subject of the piece 13.
　また、本形態では、４個の駆動用コイル１２のそれぞれは、４本の導線のそれぞれが巻回されて形成されている。すなわち、１本の導線によって１個の駆動用コイル１２が形成されている。以下では、４個の駆動用コイル１２を区別して表す場合には、それぞれの駆動用コイル１２を駆動用コイル１２Ａ～１２Ｄとする。駆動用コイル１２Ａ～１２Ｄは、図４に示すように、光軸Ｌを中心とするレンズ駆動装置１の周方向において、時計回りにこの順番で配置されている。具体的には、ＸＹ平面においてＸ方向およびＹ方向に対して略４５°傾く第１の方向Ｖ（第１方向Ｖ）で、光軸Ｌを挟むように、駆動用コイル１２Ａ、１２Ｃが配置されており、駆動用コイル１２Ａと駆動用コイル１２Ｃとは、光軸Ｌに対して略点対称で配置されている。また、ＸＹ平面において第１方向Ｖに対して略直交する第２の方向Ｗ（第２方向Ｗ）で、光軸Ｌを挟むように、駆動用コイル１２Ｂ、１２Ｄが配置されており、駆動用コイル１２Ｂと駆動用コイル１２Ｄとは、光軸Ｌに対して略点対称で配置されている。 In this embodiment, each of the four drive coils 12 is formed by winding each of the four conductive wires. That is, one drive coil 12 is formed by one conductive wire. Hereinafter, when the four drive coils 12 are distinguished from each other, the respective drive coils 12 are referred to as drive coils 12A to 12D. As shown in FIG. 4, the driving coils 12A to 12D are arranged in this order in the clockwise direction in the circumferential direction of the lens driving device 1 around the optical axis L. Specifically, the drive coils 12A and 12C are arranged so as to sandwich the optical axis L in a first direction V (first direction V) inclined by approximately 45 ° with respect to the X direction and the Y direction on the XY plane. The drive coil 12 </ b> A and the drive coil 12 </ b> C are disposed substantially symmetrical with respect to the optical axis L. In addition, driving coils 12B and 12D are arranged so as to sandwich the optical axis L in a second direction W (second direction W) substantially orthogonal to the first direction V on the XY plane. The coil 12B and the driving coil 12D are arranged substantially symmetrical with respect to the optical axis L.
　図２、図５に示すように、駆動用磁石部１１を構成する２個の駆動用磁石片１３、１４は、光軸方向において、同じ磁極同士（Ｓ極とＳ極、あるいは、Ｎ極とＮ極）が対向するように配置されている。すなわち、駆動用磁石片１３、１４同士の対向面は、いずれも同じ磁極に着磁されている。たとえば、駆動用磁石片１３、１４同士の対向面はいずれもＳ極に着磁されている。そのため、駆動用磁石片１３、１４の間には、図５、図６の矢印のように、駆動用コイル１２の三面を通過する磁束が発生している。すなわち、駆動用磁石部１１は、駆動用コイル１２との対向位置で駆動用コイル１２を通過する磁束が発生するように着磁されている。 As shown in FIGS. 2 and 5, the two drive magnet pieces 13 and 14 constituting the drive magnet unit 11 have the same magnetic poles (S pole and S pole, or N pole) in the optical axis direction. N poles) are arranged to face each other. That is, the opposing surfaces of the drive magnet pieces 13 and 14 are both magnetized to the same magnetic pole. For example, the opposing surfaces of the drive magnet pieces 13 and 14 are both magnetized to the S pole. Therefore, a magnetic flux passing through the three surfaces of the driving coil 12 is generated between the driving magnet pieces 13 and 14 as indicated by arrows in FIGS. That is, the drive magnet unit 11 is magnetized so that a magnetic flux passing through the drive coil 12 is generated at a position facing the drive coil 12.
　センサ１０は、たとえば、互いに直交する２つの方向を回転軸の方向とする傾きの検出が可能な２軸ジャイロスコープである。具体的には、センサ１０は、扁平な直方体状に形成されるとともに、その厚み方向に直交する方向を回転軸の方向とする傾きと、その厚み方向を回転軸の方向とする傾きとの検出が可能な２軸ジャイロスコープである。 The sensor 10 is, for example, a two-axis gyroscope capable of detecting an inclination with two directions orthogonal to each other as directions of rotation axes. Specifically, the sensor 10 is formed in a flat rectangular parallelepiped shape, and detects an inclination having a direction perpendicular to the thickness direction as the direction of the rotation axis and an inclination having the thickness direction as the direction of the rotation axis. This is a 2-axis gyroscope capable of
　このセンサ１０は、図３に示すように、スリーブ６の外周面に固定されている。また、センサ１０は、スリーブ６の周方向で隣り合う２個の駆動用コイル１２の間に配置されている。たとえば、センサ１０は、駆動用コイル１２Ｂと駆動用コイル１２Ｃとの間に配置されている。本形態では、センサ１０によって、Ｘ方向を回転軸の方向とするスリーブ６の傾き（すなわち、可動体２の傾き）と、Ｙ方向を回転軸の方向とするスリーブ６の傾き（すなわち、可動体２の傾き）とが検出可能となっている。 The sensor 10 is fixed to the outer peripheral surface of the sleeve 6 as shown in FIG. The sensor 10 is disposed between two driving coils 12 adjacent in the circumferential direction of the sleeve 6. For example, the sensor 10 is disposed between the driving coil 12B and the driving coil 12C. In this embodiment, the sensor 10 causes the inclination of the sleeve 6 (that is, the inclination of the movable body 2) with the X direction as the direction of the rotation axis and the inclination of the sleeve 6 with the Y direction as the direction of the rotation axis (that is, the movable body). Can be detected.
　（駆動機構の制御部の構成）
　図７は、図２に示す駆動機構４の制御部２１およびその周辺部分の構成を示す回路図である。 (Configuration of control unit of drive mechanism)
FIG. 7 is a circuit diagram showing the configuration of the control unit 21 and its peripheral part of the drive mechanism 4 shown in FIG.
　レンズ駆動装置１は、駆動機構４を制御するための制御部２１を備えている。制御部２１は、レンズを保持する可動体２を光軸方向へ移動させてレンズの焦点を合わせるフォーカス制御を行うためのフォーカス制御部２２と、レンズの光軸Ｌの傾きを補正する傾き補正制御を行うための傾き補正制御部２３とを備えている。フォーカス制御部２２および傾き補正制御部２３は、たとえば、ＣＰＵ等の演算手段によって構成されている。 The lens driving device 1 includes a control unit 21 for controlling the driving mechanism 4. The control unit 21 moves the movable body 2 holding the lens in the optical axis direction to perform focus control for focusing the lens, and tilt correction control for correcting the tilt of the optical axis L of the lens. And an inclination correction control unit 23 for performing the above. The focus control unit 22 and the inclination correction control unit 23 are configured by a calculation unit such as a CPU, for example.
　また、制御部２１は、駆動用コイル１２Ａに電流を供給する電流供給回路２４と、駆動用コイル１２Ｃに電流を供給する電流供給回路２５と、駆動用コイル１２Ｂに電流を供給する電流供給回路２６と、駆動用コイル１２Ｄに電流を供給する電流供給回路２７とを備えている。 The control unit 21 also includes a current supply circuit 24 that supplies current to the drive coil 12A, a current supply circuit 25 that supplies current to the drive coil 12C, and a current supply circuit 26 that supplies current to the drive coil 12B. And a current supply circuit 27 for supplying a current to the drive coil 12D.
　図７に示すように、電流供給回路２４～２７は、フォーカス制御部２２から同じ制御指令値が伝達されるように並列に接続されている。具体的には、電流供給回路２４～２７は、加算器２８～３１を介してフォーカス制御部２２から並列に接続されており、フォーカス制御部２２からの出力信号が加算器２８～３１に入力され、加算器２８～３１の出力信号が電流供給回路２４～２７に入力される。 As shown in FIG. 7, the current supply circuits 24 to 27 are connected in parallel so that the same control command value is transmitted from the focus control unit 22. Specifically, the current supply circuits 24 to 27 are connected in parallel from the focus control unit 22 via the adders 28 to 31, and an output signal from the focus control unit 22 is input to the adders 28 to 31. The output signals of the adders 28 to 31 are input to the current supply circuits 24 to 27.
　また、電流供給回路２４、２５は、加算器２８、２９および差動出力アンプ３２を介して傾き補正制御部２３に接続されており、傾き補正制御部２３からの出力信号が差動出力アンプ３２に入力され、差動出力アンプ３２により差動出力に変換された信号が加算器２８、２９に入力される。また、電流供給回路２６、２７は、加算器３０、３１および差動出力アンプ３３を介して傾き補正制御部２３に接続されており、傾き補正制御部２３からの出力信号が差動出力アンプ３３に入力され、差動出力アンプ３３により差動出力に変換された信号が加算器３０、３１に入力される。 The current supply circuits 24 and 25 are connected to the inclination correction control unit 23 via adders 28 and 29 and a differential output amplifier 32, and an output signal from the inclination correction control unit 23 is a differential output amplifier 32. The signals converted into differential outputs by the differential output amplifier 32 are input to the adders 28 and 29. The current supply circuits 26 and 27 are connected to the inclination correction control unit 23 via the adders 30 and 31 and the differential output amplifier 33, and an output signal from the inclination correction control unit 23 is the differential output amplifier 33. And the signals converted into differential outputs by the differential output amplifier 33 are input to the adders 30 and 31.
　傾き補正制御部２３には、センサ１０が接続されている。具体的には、Ｘ方向を軸方向とする傾きの検出信号を増幅するセンサアンプ３４と、Ｙ方向を軸方向とする傾きの検出信号を増幅するセンサアンプ３５とを介して、傾き補正制御部２３にセンサ１０が接続されており、センサ１０の検出信号は、センサアンプ３４、３５を介して傾き補正制御部２３に入力される。フォーカス制御部２２には、レンズ駆動装置１が搭載されるカメラの制御を行う上位制御部３６が接続されている。 The sensor 10 is connected to the inclination correction control unit 23. Specifically, an inclination correction control unit is provided via a sensor amplifier 34 that amplifies a detection signal of an inclination with the X direction as an axial direction and a sensor amplifier 35 that amplifies a detection signal of an inclination with the Y direction as an axial direction. The sensor 10 is connected to 23, and the detection signal of the sensor 10 is input to the inclination correction control unit 23 via the sensor amplifiers 34 and 35. The focus control unit 22 is connected to a host control unit 36 that controls the camera on which the lens driving device 1 is mounted.
　本形態では、レンズの焦点を合わせるために可動体２を光軸方向へ移動させる際には、フォーカス制御部２２は、制御指令値信号を電流供給回路２４～２７に向かって出力する。ここで、センサ１０でＸ方向および／またはＹ方向を軸方向とする可動体２の傾きが検出されず、差動出力アンプ３２、３３から信号の出力がない場合には、電流供給回路２４～２７から駆動用コイル１２Ａ～１２Ｄに等しい大きさの電流が供給される。そのため、各駆動用コイル１２Ａ～１２Ｄと各駆動用磁石部１１との間には、光軸方向への略等しい駆動力が生じる。したがって、可動体２は、傾くことなく光軸方向へ移動する。 In this embodiment, when the movable body 2 is moved in the optical axis direction in order to adjust the focus of the lens, the focus control unit 22 outputs a control command value signal toward the current supply circuits 24-27. Here, when the sensor 10 does not detect the tilt of the movable body 2 with the X direction and / or the Y direction as the axial direction and no signal is output from the differential output amplifiers 32 and 33, the current supply circuits 24 to 27, a current having the same magnitude is supplied to the drive coils 12A to 12D. Therefore, a substantially equal driving force in the optical axis direction is generated between each of the driving coils 12A to 12D and each of the driving magnet portions 11. Therefore, the movable body 2 moves in the optical axis direction without tilting.
　一方、センサ１０でＸ方向および／またはＹ方向を軸方向とする可動体２の傾きが検出されると、傾き補正制御部２３は、センサ１０から入力される検出信号に基づいて、傾き補正用の信号を生成し、差動出力アンプ３２および／または差動出力アンプ３３に向かってこの信号を出力する。差動出力アンプ３２に傾き補正制御部２３の出力信号が入力されると、差動出力アンプ３２は、この信号に基づいて差動出力に変換された信号を生成しこの信号を加算器２８、２９に向かって出力する。また、差動出力アンプ３３に傾き補正用の信号が入力されると、差動出力アンプ３３は、この信号に基づいて差動出力に変換された信号を生成しこの信号を加算器３０、３１に向かって出力する。 On the other hand, when the sensor 10 detects the tilt of the movable body 2 with the X direction and / or the Y direction as the axial direction, the tilt correction control unit 23 performs tilt correction based on the detection signal input from the sensor 10. Is output to the differential output amplifier 32 and / or the differential output amplifier 33. When the output signal of the inclination correction control unit 23 is input to the differential output amplifier 32, the differential output amplifier 32 generates a signal converted into a differential output based on this signal, and this signal is added to the adder 28, Output to 29. When a signal for tilt correction is input to the differential output amplifier 33, the differential output amplifier 33 generates a signal converted into a differential output based on this signal, and this signal is added to the adders 30, 31. Output toward.
　加算器２８～３１では、フォーカス制御部２２からの制御指令値信号と、傾き補正制御部２３からの制御指令値に基づいて差動出力アンプ３２、３３で差動出力に変換された信号とが加算され、電流供給回路２４～２７にこの加算された信号が入力される。そのため、電流供給回路２４～２７から駆動用コイル１２Ａ～１２Ｄには、加算器２８～３１の出力信号に応じた大きさの電流が供給される。したがって、各駆動用コイル１２Ａ～１２Ｄと各駆動用磁石部１１との間には、加算器２８～３１の出力信号に応じた駆動力が生じる。その結果、センサ１０でＸ方向および／またはＹ方向を軸方向とする可動体２の傾きが検出されると、可動体２は、傾きながら光軸方向へ移動して、可動体２の傾き（すなわち、レンズの光軸Ｌの傾き）が補正される。 In the adders 28 to 31, a control command value signal from the focus control unit 22 and a signal converted into a differential output by the differential output amplifiers 32 and 33 based on the control command value from the inclination correction control unit 23. The added signals are input to the current supply circuits 24-27. Therefore, a current having a magnitude corresponding to the output signals of the adders 28 to 31 is supplied from the current supply circuits 24 to 27 to the driving coils 12A to 12D. Therefore, a driving force corresponding to the output signals of the adders 28 to 31 is generated between the driving coils 12A to 12D and the driving magnet units 11. As a result, when the sensor 10 detects the tilt of the movable body 2 with the X direction and / or the Y direction as the axial direction, the movable body 2 moves in the optical axis direction while tilting, and the tilt of the movable body 2 ( That is, the inclination of the optical axis L of the lens is corrected.
　たとえば、センサ１０でＸ方向を軸方向とする可動体２の傾きが検出されると、駆動用コイル１２Ａと駆動用コイル１２Ｂとに等しい大きさの電流が供給されるとともに、駆動用コイル１２Ｃと駆動用コイル１２Ｄとに、駆動用コイル１２Ａ、１２Ｂに供給される電流の大きさと異なる大きさの電流であって、かつ、等しい大きさの電流が供給されて、Ｘ方向を軸方向とする可動体２の傾きが補正される。 For example, when the sensor 10 detects the inclination of the movable body 2 with the X direction as the axial direction, a current having the same magnitude is supplied to the driving coil 12A and the driving coil 12B, and the driving coil 12C A current having a magnitude different from that of the current supplied to the drive coils 12A and 12B and the same magnitude as the current supplied to the drive coil 12D, and having the X direction as the axial direction is movable. The inclination of the body 2 is corrected.
　また、たとえば、センサ１０でＹ方向を軸方向とする可動体２の傾きが検出されると、駆動用コイル１２Ａと駆動用コイル１２Ｄとに等しい大きさの電流が供給されるとともに、駆動用コイル１２Ｂと駆動用コイル１２Ｃとに、駆動用コイル１２Ａ、１２Ｄに供給される電流の大きさと異なる大きさの電流であって、かつ、等しい大きさの電流が供給されて、Ｙ方向を軸方向とする可動体２の傾きが補正される。 For example, when the sensor 10 detects the inclination of the movable body 2 with the Y direction as the axial direction, a current of the same magnitude is supplied to the drive coil 12A and the drive coil 12D, and the drive coil 12B and the driving coil 12C are supplied with a current having a magnitude different from that of the current supplied to the driving coils 12A and 12D and the same magnitude, and the Y direction is defined as the axial direction. The tilt of the movable body 2 is corrected.
　なお、本形態では、傾き補正制御部２３と加算器２８、２９と差動出力アンプ３２とによって、センサ１０からの出力結果に基づいて、光軸Ｌに対して略点対称に配置される駆動用コイル１２Ａ、１２Ｃに供給される電流の大きさを制御する第１電流制御部４１が構成されている。また、傾き補正制御部２３と加算器３０、３１と差動出力アンプ３３とによって、残りの２個の駆動用コイル１２Ｂ、１２Ｄに供給される電流の大きさを制御する第２電流制御部４２が構成されている。 In this embodiment, the tilt correction control unit 23, the adders 28 and 29, and the differential output amplifier 32 drive substantially symmetrical with respect to the optical axis L based on the output result from the sensor 10. A first current control unit 41 that controls the magnitude of the current supplied to the coils 12A and 12C is configured. The second current control unit 42 controls the magnitude of the current supplied to the remaining two drive coils 12B and 12D by the inclination correction control unit 23, the adders 30 and 31, and the differential output amplifier 33. Is configured.
　（本形態の主な効果）
　以上説明したように、本形態では、略三角筒状に巻回された４個の駆動用コイル１２のそれぞれは、その内周面が４個の駆動用磁石部１１の外周面のそれぞれと所定の隙間を介して対向するように配置されている。また、駆動用磁石部１１は、その長手方向が光軸方向と略平行になるように配置されるとともに、駆動用コイル１１との対向位置で駆動用コイル１２を通過する磁束が発生するように着磁されている。そのため、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに光軸方向への駆動力が生じる。また、本形態では、４個の駆動用コイル１２のそれぞれは、４本の導線のそれぞれが巻回されて形成されている。そのため、４個の駆動用コイル１２に供給される電流の大きさを制御することで、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力の大きさを変えることができる。さらに、本形態では、４個の駆動用磁石部１１は、レンズ駆動装置１の四隅に配置されている。そのため、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力の大きさを変えることで、光軸Ｌの傾きを補正することができる。したがって、本形態では、光軸Ｌの傾きを適切に補正することで光軸Ｌの傾きを抑制することが可能になる。 (Main effects of this form)
As described above, in this embodiment, each of the four drive coils 12 wound in a substantially triangular cylindrical shape has an inner peripheral surface that is predetermined with each of the outer peripheral surfaces of the four drive magnet portions 11. It arrange | positions so that it may oppose through the clearance gap. Further, the drive magnet unit 11 is arranged so that its longitudinal direction is substantially parallel to the optical axis direction, and a magnetic flux passing through the drive coil 12 is generated at a position facing the drive coil 11. Magnetized. Therefore, a driving force in the direction of the optical axis is generated between each of the four driving magnet units 11 and the four driving coils 12. In this embodiment, each of the four drive coils 12 is formed by winding each of the four conductive wires. Therefore, by controlling the magnitude of the current supplied to the four driving coils 12, the magnitude of the driving force generated in each of the four driving magnets 11 and the four driving coils 12 is controlled. You can change that. Furthermore, in this embodiment, the four drive magnet portions 11 are arranged at the four corners of the lens drive device 1. Therefore, the inclination of the optical axis L can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet portions 11 and the four driving coils 12. Therefore, in this embodiment, it is possible to suppress the inclination of the optical axis L by appropriately correcting the inclination of the optical axis L.
　また、本形態では、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力の大きさを同じにすることで、光軸Ｌを傾けることなく可動体２を光軸方向へ駆動することができる。すなわち、共通の駆動用磁石部１１および駆動用コイル１２を利用して、レンズのフォーカス動作と光軸Ｌの傾き補正とを行うことができる。したがって、レンズのフォーカス動作を行うための駆動機構と、光軸Ｌの傾き補正を行うための駆動機構とが個別に設けられている場合と比較して、レンズ駆動装置１の構成を簡素化することができ、レンズ駆動装置１のコストを低減することができる。 Moreover, in this embodiment, the movable body without tilting the optical axis L is obtained by making the magnitudes of the driving forces generated between the four driving magnet portions 11 and the four driving coils 12 the same. 2 can be driven in the direction of the optical axis. That is, the lens focus operation and the optical axis L inclination correction can be performed using the common drive magnet unit 11 and the drive coil 12. Therefore, the configuration of the lens driving device 1 is simplified as compared with the case where a driving mechanism for performing the focusing operation of the lens and a driving mechanism for correcting the inclination of the optical axis L are provided separately. Therefore, the cost of the lens driving device 1 can be reduced.
　また、本形態では、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力の大きさを変えることで、光軸Ｌの傾きを補正することができるため、レンズ駆動装置１が搭載されるカメラで手振れ等の振れが生じた場合に、この振れを補正することも可能になる。 In this embodiment, the inclination of the optical axis L can be corrected by changing the magnitude of the driving force generated between each of the four driving magnet units 11 and the four driving coils 12. For this reason, when shake such as camera shake occurs in the camera in which the lens driving device 1 is mounted, it is also possible to correct this shake.
　本形態では、４個の駆動用磁石部１１および４個の駆動用コイル１２は、光軸Ｌを略中心にして略９０°の回転対称で配置されている。そのため、光軸Ｌの傾きを補正する際の、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力のバランスの調整が比較的容易になる。したがって、本形態では、光軸Ｌの傾きをより適切に補正することが可能になる。また、本形態では、光軸Ｌの傾きを補正する際の制御部２１での制御が容易になる。 In this embodiment, the four drive magnet portions 11 and the four drive coils 12 are arranged in a rotational symmetry of about 90 ° with the optical axis L as the center. Therefore, when correcting the inclination of the optical axis L, it is relatively easy to adjust the balance of the driving forces generated between the four driving magnet units 11 and the four driving coils 12. Therefore, in this embodiment, it is possible to more appropriately correct the inclination of the optical axis L. In this embodiment, the control by the control unit 21 when correcting the inclination of the optical axis L is facilitated.
　本形態では、光軸方向で重なるように配置される２個の駆動用磁石片１３、１４同士の対向面はいずれも、同じ磁極に着磁されている。そのため、２個の駆動用磁石片１３、１４同士の対向面の間において、駆動用コイル１２を通過する磁束の密度を高めることができる。したがって、可動体２を駆動するための磁気回路をより効率良く形成することができ、４個の駆動用磁石部１１と４個の駆動用コイル１２との間のそれぞれに生じる駆動力を高めることができる。その結果、本形態では、光軸Ｌの傾きを補正する際の応答性を高めることが可能になり、光軸Ｌの傾きを効果的に抑制することが可能になる。 In this embodiment, the opposing surfaces of the two drive magnet pieces 13 and 14 arranged so as to overlap in the optical axis direction are both magnetized to the same magnetic pole. Therefore, it is possible to increase the density of the magnetic flux passing through the driving coil 12 between the opposing surfaces of the two driving magnet pieces 13 and 14. Therefore, the magnetic circuit for driving the movable body 2 can be formed more efficiently, and the driving force generated in each of the four driving magnet portions 11 and the four driving coils 12 can be increased. Can do. As a result, in this embodiment, it is possible to improve the responsiveness when correcting the inclination of the optical axis L, and it is possible to effectively suppress the inclination of the optical axis L.
　本形態では、光軸Ｌに対して略点対称に配置される駆動用コイル１２Ａ、１２Ｃのそれぞれに供給される電流の大きさが第１電流制御部４１によって制御され、光軸Ｌに対して略点対称に配置される駆動用コイル１２Ｂ、１２Ｄのそれぞれに供給される電流の大きさが第２電流制御部４２によって制御されている。そのため、駆動用コイル１２Ａ、１２Ｃによって、第２方向Ｗを軸方向とする光軸Ｌの傾きを補正し、駆動用コイル１２Ｂ、１２Ｄによって、第１方向Ｖを軸方向とする光軸Ｌの傾きを補正することができる。したがって、本形態では、４個の駆動用コイル１２によって、全方向で光軸Ｌの傾きを補正することが可能になる。 In this embodiment, the magnitude of the current supplied to each of the drive coils 12A and 12C arranged substantially point-symmetrically with respect to the optical axis L is controlled by the first current control unit 41, and the optical axis L is controlled. The magnitude of the current supplied to each of the drive coils 12 </ b> B and 12 </ b> D arranged approximately point-symmetrically is controlled by the second current control unit 42. Therefore, the inclination of the optical axis L with the second direction W as the axial direction is corrected by the driving coils 12A and 12C, and the inclination of the optical axis L with the first direction V as the axial direction is corrected by the driving coils 12B and 12D. Can be corrected. Therefore, in the present embodiment, the four driving coils 12 can correct the inclination of the optical axis L in all directions.
　本形態では、センサ１０は、可動体２に固定されている。そのため、可動体２に保持されるレンズの光軸Ｌの傾きをセンサ１０で直接的に検出することができる。したがって、本形態では、センサ１０での検出結果に基づいて、光軸Ｌの傾きを補正することで、リアルタイムで光軸Ｌの傾きを補正することができる。 In this embodiment, the sensor 10 is fixed to the movable body 2. Therefore, the inclination of the optical axis L of the lens held by the movable body 2 can be directly detected by the sensor 10. Therefore, in this embodiment, the inclination of the optical axis L can be corrected in real time by correcting the inclination of the optical axis L based on the detection result of the sensor 10.
　本形態では、センサ１０は、周方向で隣り合う２個の駆動用コイル１２の間に配置されている。そのため、デッドスペースとなりやすい２個の駆動用コイル１２の間を利用してセンサ１０を配置することができる。したがって、本形態では、レンズ駆動装置１を小型化することが可能になる。 In this embodiment, the sensor 10 is arranged between two drive coils 12 adjacent in the circumferential direction. Therefore, the sensor 10 can be arranged using the space between the two drive coils 12 that are likely to become a dead space. Therefore, in this embodiment, the lens driving device 1 can be reduced in size.
　（他の実施の形態）
　上述した形態は、本発明の好適な形態の一例ではあるが、これに限定されるものではなく本発明の要旨を変更しない範囲において種々変形実施が可能である。 (Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.
　上述した形態では、駆動用コイル１２Ａが電流供給回路２４に接続され、駆動用コイル１２Ｃが電流供給回路２５に接続され、駆動用コイル１２Ｂが電流供給回路２６に接続され、駆動用コイル１２Ｄが電流供給回路２７に接続されている。この他にもたとえば、駆動用コイル１２Ａが電流供給回路２４に接続され、駆動用コイル１２Ｂが電流供給回路２５に接続され、駆動用コイル１２Ｃが電流供給回路２６に接続され、駆動用コイル１２Ｄが電流供給回路２７に接続されても良い。 In the embodiment described above, the drive coil 12A is connected to the current supply circuit 24, the drive coil 12C is connected to the current supply circuit 25, the drive coil 12B is connected to the current supply circuit 26, and the drive coil 12D is the current. The supply circuit 27 is connected. In addition, for example, the drive coil 12A is connected to the current supply circuit 24, the drive coil 12B is connected to the current supply circuit 25, the drive coil 12C is connected to the current supply circuit 26, and the drive coil 12D is It may be connected to the current supply circuit 27.
　このように構成すると、Ｙ方向を軸方向とする光軸Ｌの傾きを補正することができる。したがって、レンズ駆動装置１が搭載されるカメラでＹ方向を軸方向とする光軸Ｌの傾きが発生しやすい場合には、このように構成すれば、光軸Ｌの傾きを抑制することが可能になる。 With this configuration, it is possible to correct the inclination of the optical axis L with the Y direction as the axial direction. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the Y direction as an axial direction, this configuration can suppress the inclination of the optical axis L. become.
　また、駆動用コイル１２Ａが電流供給回路２４に接続され、駆動用コイル１２Ｄが電流供給回路２５に接続され、駆動用コイル１２Ｂが電流供給回路２６に接続され、駆動用コイル１２Ｃが電流供給回路２７に接続されても良い。このように構成すると、Ｘ方向を軸方向とする光軸Ｌの傾きを補正することができる。したがって、レンズ駆動装置１が搭載されるカメラでＸ方向を軸方向とする光軸Ｌの傾きが発生しやすい場合には、このように構成すれば、光軸Ｌの傾きを抑制することが可能になる。 The drive coil 12A is connected to the current supply circuit 24, the drive coil 12D is connected to the current supply circuit 25, the drive coil 12B is connected to the current supply circuit 26, and the drive coil 12C is connected to the current supply circuit 27. May be connected. If comprised in this way, the inclination of the optical axis L which makes an X direction an axial direction can be correct | amended. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the X direction as an axial direction, the configuration of the configuration can suppress the inclination of the optical axis L. become.
　なお、この場合には、第１電流制御部４１は、センサ１０からの出力結果に基づいて、周方向で隣り合う２個の駆動用コイル１２Ａ、１２Ｂ、または、駆動用コイル１２Ａ、１２Ｄのそれぞれに供給される電流の大きさを制御する第３電流制御部となり、第２電流制御部４２は、残りの２個の駆動用コイル１２Ｃ、１２Ｄ、または、駆動用コイル１２Ｂ、１２Ｃのそれぞれに供給される電流の大きさを制御する第４電流制御部となる。 In this case, based on the output result from the sensor 10, the first current control unit 41 is configured so that each of the two driving coils 12 </ b> A and 12 </ b> B or the driving coils 12 </ b> A and 12 </ b> D adjacent in the circumferential direction is present. The second current control unit 42 supplies the remaining two driving coils 12C and 12D or the driving coils 12B and 12C to the third current control unit that controls the magnitude of the current supplied to The fourth current control unit controls the magnitude of the current to be generated.
　上述した形態では、傾き補正制御部２３と加算器２８、２９との間に差動出力アンプ３２が配置され、傾き補正制御部２３と加算器３０、３１との間に差動出力アンプ３３が配置されている。この他にもたとえば、傾き補正制御部２３と加算器２８～３１とが直接、接続されても良い。 In the embodiment described above, the differential output amplifier 32 is disposed between the inclination correction control unit 23 and the adders 28 and 29, and the differential output amplifier 33 is disposed between the inclination correction control unit 23 and the adders 30 and 31. Has been placed. In addition, for example, the inclination correction control unit 23 and the adders 28 to 31 may be directly connected.
　上述した形態では、４個の駆動用磁石部１１および４個の駆動用コイル１２は、レンズ駆動装置１の四隅に配置されている。この他にもたとえば、可動体２の外周側の、Ｘ方向における略中間位置に２個の駆動用磁石部１１および２個の駆動用コイル１２が配置され、可動体２の外周側の、Ｙ方向における略中間位置に２個の駆動用磁石部１１および２個の駆動用コイル１２が配置されても良い。また、４個の駆動用磁石部１１および４個の駆動用コイル１２は、光軸Ｌを中心にして略９０°の回転対称で配置されていなくても良い。すなわち、光軸方向から見たときに、４個の駆動用磁石部１１および４個の駆動用コイル１２が互いに重ならないように配置されていれば、光軸Ｌの傾きを抑制することができる等の上述の効果を得ることは可能である。 In the embodiment described above, the four drive magnet portions 11 and the four drive coils 12 are arranged at the four corners of the lens drive device 1. In addition to this, for example, two driving magnet portions 11 and two driving coils 12 are arranged at a substantially intermediate position in the X direction on the outer peripheral side of the movable body 2, and Y on the outer peripheral side of the movable body 2 is arranged. Two drive magnet portions 11 and two drive coils 12 may be arranged at a substantially intermediate position in the direction. Further, the four drive magnet portions 11 and the four drive coils 12 do not have to be arranged with a rotational symmetry of about 90 ° about the optical axis L. That is, if the four driving magnet portions 11 and the four driving coils 12 are arranged so as not to overlap each other when viewed from the optical axis direction, the inclination of the optical axis L can be suppressed. It is possible to obtain the above-described effects.
　上述した形態では、レンズ駆動装置１は、光軸方向から見たときの形状が略正方形状となるように形成されている。この他にもたとえば、レンズ駆動装置１は、光軸方向から見たときの形状が略長方形状や略台形状となるように形成されても良い。また、レンズ駆動装置１は、光軸方向から見たときの形状が略四角形状以外の略多角形状となるように形成されても良いし、光軸方向から見たときの形状が略円形状あるいは略楕円形状となるように形成されても良い。 In the above-described form, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square. In addition, for example, the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is substantially rectangular or trapezoidal. Further, the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is a substantially polygonal shape other than the substantially square shape, or the shape when viewed from the optical axis direction is a substantially circular shape. Or you may form so that it may become a substantially ellipse shape.
　上述した形態では、駆動用磁石部１１は略三角柱状に形成されているが、駆動用磁石部１１は略三角柱状以外の略多角柱状に形成されても良いし、略円柱状や略楕円柱状に形成されても良い。また、上述した形態では、駆動用コイル１２は略三角筒状に巻回されているが、駆動用コイル１２は略三角筒状以外の略多角筒状に巻回されても良いし、略円筒状や略楕円筒状に巻回されても良い。 In the embodiment described above, the drive magnet portion 11 is formed in a substantially triangular prism shape. However, the drive magnet portion 11 may be formed in a substantially polygonal column shape other than a substantially triangular prism shape, a substantially cylindrical shape, or a substantially elliptical column shape. May be formed. In the embodiment described above, the driving coil 12 is wound in a substantially triangular cylindrical shape. However, the driving coil 12 may be wound in a substantially polygonal cylindrical shape other than the substantially triangular cylindrical shape, or a substantially cylindrical shape. It may be wound in a shape or a substantially oval cylindrical shape.
　上述した形態では、駆動用磁石片１３、１４同士の対向面の間には、磁性板１５が配置されている。この他にもたとえば、駆動用磁石片１３、１４同士の対向面の間に磁性板１５が配置されずに、駆動用磁石片１３、１４同士の対向面の間に隙間が形成されても良いし、駆動用磁石片１３、１４同士の対向面が当接していても良い。また、上述した形態では、駆動用磁石部１１は、２個の駆動用磁石片１３、１４と磁性板１５とによって構成されているが、駆動用磁石部１１は、１個の駆動用磁石片のみによって構成されても良い。この場合には、この駆動用磁石片は、光軸方向の両端に形成される磁極と光軸方向の中間位置に形成される磁極とが異なるように着磁される。 In the above-described embodiment, the magnetic plate 15 is disposed between the opposing surfaces of the drive magnet pieces 13 and 14. In addition, for example, the magnetic plate 15 may not be disposed between the facing surfaces of the driving magnet pieces 13 and 14, and a gap may be formed between the facing surfaces of the driving magnet pieces 13 and 14. And the opposing surface of the magnet pieces 13 for drive and 14 may contact | abut. In the embodiment described above, the driving magnet unit 11 is constituted by the two driving magnet pieces 13 and 14 and the magnetic plate 15, but the driving magnet unit 11 is a single driving magnet piece. It may be constituted only by. In this case, the driving magnet pieces are magnetized so that the magnetic poles formed at both ends in the optical axis direction are different from the magnetic poles formed at intermediate positions in the optical axis direction.
　上述した形態では、センサ１０は、互いに直交する２つの方向を回転軸の方向とする傾きの検出が可能な２軸ジャイロスコープである。この他にもたとえば、センサ１０は、１つの方向を回転軸の方向とする傾きの検出が可能な１軸ジャイロスコープであっても良い。この場合には、２個のセンサ１０がスリーブ６に固定される。具体的には、たとえば、駆動用コイル１２Ｂと駆動用コイル１２Ｃとの間で一方のセンサ１０がスリーブ６に固定され、駆動用コイル１２Ｃと駆動用コイル１２Ｄとの間で他方のセンサ１０がスリーブ６に固定される。なお、センサ１０は、互いに直交する３つの方向を回転軸の方向とする傾きの検出が可能な３軸ジャイロスコープであっても良い。 In the embodiment described above, the sensor 10 is a two-axis gyroscope capable of detecting an inclination with two directions orthogonal to each other as directions of the rotation axis. In addition to this, for example, the sensor 10 may be a single-axis gyroscope capable of detecting an inclination with one direction as the direction of the rotation axis. In this case, two sensors 10 are fixed to the sleeve 6. Specifically, for example, one sensor 10 is fixed to the sleeve 6 between the driving coil 12B and the driving coil 12C, and the other sensor 10 is connected to the sleeve between the driving coil 12C and the driving coil 12D. 6 is fixed. Note that the sensor 10 may be a three-axis gyroscope capable of detecting an inclination with three directions orthogonal to each other as directions of rotation axes.
　上述した形態では、センサ１０は、スリーブ６に固定されているが、センサ１０は、固定体３に固定されても良い。たとえば、センサ１０は、第１ケース体７の筒部７ｂの内周面に固定されても良い。なお、この場合にも、センサ１０は、周方向で隣接する２個の駆動用コイル１２の間に配置されていることが好ましい。 In the embodiment described above, the sensor 10 is fixed to the sleeve 6, but the sensor 10 may be fixed to the fixed body 3. For example, the sensor 10 may be fixed to the inner peripheral surface of the cylindrical portion 7 b of the first case body 7. In this case as well, the sensor 10 is preferably disposed between two driving coils 12 adjacent in the circumferential direction.
　上述した形態では、４個の駆動用コイル１２に供給される電流の大きさを変えることで、光軸Ｌの傾きを補正している。この他にもたとえば、４個の駆動用コイル１２に供給される電流の向きを変えることで光軸Ｌの傾きを補正しても良い。 In the above-described embodiment, the inclination of the optical axis L is corrected by changing the magnitude of the current supplied to the four drive coils 12. In addition, for example, the inclination of the optical axis L may be corrected by changing the direction of the current supplied to the four drive coils 12.
　上述した形態では、駆動用コイル１２を利用して、可動体２を光軸方向へ移動させるとともに、可動体２の傾きを補正している。この他にもたとえば、可動体２を光軸方向へ移動させるための駆動用コイルを別途、スリーブ６の外周面に沿って巻回し、この駆動用コイルを利用して可動体２を光軸方向へ移動させるとともに、駆動用コイル１２を可動体２の傾きの補正のみに利用しても良い。 In the above-described embodiment, the movable body 2 is moved in the optical axis direction using the driving coil 12 and the inclination of the movable body 2 is corrected. In addition, for example, a driving coil for moving the movable body 2 in the optical axis direction is separately wound around the outer peripheral surface of the sleeve 6, and the movable body 2 is moved in the optical axis direction using the driving coil. The driving coil 12 may be used only for correcting the inclination of the movable body 2.
　上述した形態では、可動体２側に駆動用コイル１２が固定され、固定体３側に駆動用磁石部１１が固定されているが、可動体２側に駆動用磁石部１１が固定され、固定体３側に駆動用コイル１２が固定されても良い。 In the embodiment described above, the driving coil 12 is fixed on the movable body 2 side and the driving magnet section 11 is fixed on the fixed body 3 side, but the driving magnet section 11 is fixed and fixed on the movable body 2 side. The driving coil 12 may be fixed to the body 3 side.
　上述した形態では、駆動用コイル１２Ａ～１２Ｄのそれぞれは、電流供給回路２４～２７のそれぞれに接続されている。この他にもたとえば、駆動用コイル１２Ａと駆動用コイル１２Ｄとが直列に接続されるとともに電流供給回路２４に接続され、駆動用コイル１２Ｂと駆動用コイル１２Ｃとが直列に接続されるとともに電流供給回路２５に接続されても良い。あるいは、駆動用コイル１２Ａと駆動用コイル１２Ｄとが１本の導線が順次巻回されることで形成されるとともに電流供給回路２４に接続され、駆動用コイル１２Ｂと駆動用コイル１２Ｃとが１本の導線が順次巻回されることで形成されるとともに電流供給回路２５に接続されても良い。 In the above-described form, each of the drive coils 12A to 12D is connected to each of the current supply circuits 24 to 27. In addition, for example, the driving coil 12A and the driving coil 12D are connected in series and connected to the current supply circuit 24, and the driving coil 12B and the driving coil 12C are connected in series and supplied with current. It may be connected to the circuit 25. Alternatively, the drive coil 12A and the drive coil 12D are formed by sequentially winding one conductive wire and connected to the current supply circuit 24, and the drive coil 12B and the drive coil 12C are one. These conductors may be formed by being sequentially wound and connected to the current supply circuit 25.
　このように構成すると、Ｙ方向を軸方向とする光軸Ｌの傾きを補正することができる。したがって、レンズ駆動装置１が搭載されるカメラでＹ方向を軸方向とする光軸Ｌの傾きが発生しやすい場合には、このように構成すれば、光軸Ｌの傾きを抑制することが可能になる。 With this configuration, it is possible to correct the inclination of the optical axis L with the Y direction as the axial direction. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the Y direction as an axial direction, this configuration can suppress the inclination of the optical axis L. become.
　同様に、駆動用コイル１２Ａと駆動用コイル１２Ｂとが直列に接続されるとともに電流供給回路２４に接続され、駆動用コイル１２Ｃと駆動用コイル１２Ｄとが直列に接続されるとともに電流供給回路２５に接続されても良い。あるいは、駆動用コイル１２Ａと駆動用コイル１２Ｂとが１本の導線が順次巻回されることで形成されるとともに電流供給回路２４に接続され、駆動用コイル１２Ｃと駆動用コイル１２Ｄとが１本の導線が順次巻回されることで形成されるとともに、電流供給回路２５に接続されても良い。 Similarly, the drive coil 12A and the drive coil 12B are connected in series and connected to the current supply circuit 24, and the drive coil 12C and the drive coil 12D are connected in series and connected to the current supply circuit 25. It may be connected. Alternatively, the drive coil 12A and the drive coil 12B are formed by sequentially winding one conductive wire and connected to the current supply circuit 24, and the drive coil 12C and the drive coil 12D are one. These conductors may be formed by being sequentially wound, and may be connected to the current supply circuit 25.
　このように構成すると、Ｘ方向を軸方向とする光軸Ｌの傾きを補正することができる。したがって、レンズ駆動装置１が搭載されるカメラでＸ方向を軸方向とする光軸Ｌの傾きが発生しやすい場合には、このように構成すれば、光軸Ｌの傾きを抑制することが可能になる。 With this configuration, the inclination of the optical axis L with the X direction as the axial direction can be corrected. Therefore, when the camera in which the lens driving device 1 is mounted is likely to cause an inclination of the optical axis L with the X direction as an axial direction, the configuration of the configuration can suppress the inclination of the optical axis L. become.
　なお、これらの場合には、電流供給回路２６、２７、加算器３０、３１および差動出力アンプ３３等が不要となるため、制御部２１の構成を簡素化することができる。 In these cases, the current supply circuits 26 and 27, the adders 30 and 31, the differential output amplifier 33, and the like are not necessary, so that the configuration of the control unit 21 can be simplified.

Claims (10)

  1. 　レンズを保持し前記レンズの光軸方向へ移動可能な可動体と、前記可動体を駆動するための駆動機構とを備え、
    　前記駆動機構は、略柱状に形成される４個の駆動用磁石部と、略筒状に巻回されて形成される４個の駆動用コイルとを備え、
    　４個の前記駆動用磁石部は、その長手方向が前記光軸方向と略平行になるように配置されるとともに、前記光軸方向から見たときに互いに重ならない位置に配置され、
    　４個の前記駆動用コイルのそれぞれは、その内周面が４個の前記駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、
    　前記駆動用磁石部は、前記駆動用コイルとの対向位置で前記駆動用コイルを通過する磁束が発生するように着磁され、
    　４個の前記駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されていることを特徴とするレンズ駆動装置。     A movable body that holds the lens and is movable in the optical axis direction of the lens, and a drive mechanism for driving the movable body,
    The drive mechanism includes four drive magnet portions formed in a substantially columnar shape, and four drive coils formed in a substantially cylindrical shape,
    The four drive magnet portions are arranged so that the longitudinal direction thereof is substantially parallel to the optical axis direction, and are arranged at positions that do not overlap each other when viewed from the optical axis direction,
    Each of the four driving coils is arranged such that an inner peripheral surface thereof faces each of the outer peripheral surfaces of the four driving magnet portions with a predetermined gap therebetween,
    The drive magnet portion is magnetized so that a magnetic flux passing through the drive coil is generated at a position facing the drive coil,
    Each of the four drive coils is formed by winding each of the four conductive wires.
  2. 　４個の前記駆動用磁石部および４個の前記駆動用コイルは、前記レンズの光軸を略中心にして略９０°の回転対称で配置されていることを特徴とする請求項１記載のレンズ駆動装置。 The lens according to claim 1, wherein the four driving magnet portions and the four driving coils are arranged in a rotational symmetry of approximately 90 ° about the optical axis of the lens. Drive device.
  3. 　前記駆動用磁石部は、前記光軸方向で重なるように配置される略柱状の２個の駆動用磁石片を備え、
    　前記光軸方向における２個の前記駆動用磁石片同士の対向面はいずれも、同じ磁極に着磁されていることを特徴とする請求項１または２記載のレンズ駆動装置。     The drive magnet section includes two substantially columnar drive magnet pieces arranged so as to overlap in the optical axis direction,
    The lens driving device according to claim 1, wherein the opposing surfaces of the two driving magnet pieces in the optical axis direction are both magnetized to the same magnetic pole.
  4. 　前記レンズの光軸の傾きを検出するためのセンサを備え、
    　前記センサは、前記可動体に取り付けられていることを特徴とする請求項１から３のいずれかに記載のレンズ駆動装置。     A sensor for detecting the inclination of the optical axis of the lens;
    The lens driving device according to claim 1, wherein the sensor is attached to the movable body.
  5. 　前記可動体を前記光軸方向へ移動可能に保持する固定体と、前記レンズの光軸の傾きを検出するためのセンサとを備え、
    　前記センサは、前記固定体に取り付けられていることを特徴とする請求項１から３のいずれかに記載のレンズ駆動装置。     A fixed body that holds the movable body so as to be movable in the optical axis direction, and a sensor for detecting the inclination of the optical axis of the lens,
    The lens driving device according to claim 1, wherein the sensor is attached to the fixed body.
  6. 　前記センサは、前記レンズ駆動装置の周方向で隣り合う前記駆動用コイルの間に配置されていることを特徴とする請求項４または５記載のレンズ駆動装置。 6. The lens driving device according to claim 4, wherein the sensor is disposed between the driving coils adjacent in the circumferential direction of the lens driving device.
  7. 　前記光軸方向から見たときの形状が略長方形状または略正方形状となる略四角柱状に形成されるとともに、前記駆動機構を制御するための制御部を備え、
    　４個の前記駆動用磁石部および４個の前記駆動用コイルのそれぞれは、前記レンズ駆動装置の四隅のそれぞれに配置され、
    　前記制御部は、前記センサからの出力結果に基づいて、４個の前記駆動用コイルのうちの、前記レンズの光軸に対して略点対称に配置される２個の前記駆動用コイルのそれぞれに供給される電流の大きさを制御する第１電流制御部と、前記センサからの出力結果に基づいて、残りの２個の前記駆動用コイルのそれぞれに供給される電流の大きさを制御する第２電流制御部とを備えることを特徴とする請求項４から６のいずれかに記載のレンズ駆動装置。     The shape when viewed from the optical axis direction is formed in a substantially rectangular column shape that is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the drive mechanism,
    Each of the four driving magnet portions and the four driving coils are arranged at each of the four corners of the lens driving device,
    Each of the two driving coils arranged approximately point-symmetrically with respect to the optical axis of the lens among the four driving coils based on the output result from the sensor. Based on the output result from the first current control unit that controls the magnitude of the current supplied to the first and second sensors, the magnitude of the current supplied to each of the remaining two driving coils is controlled. The lens driving device according to claim 4, further comprising a second current control unit.
  8. 　前記光軸方向から見たときの形状が略正方形状となる略四角柱状に形成され、
    　４個の前記駆動用磁石部および４個の前記駆動用コイルは、前記レンズの光軸を略中心にして略９０°の回転対称で配置されていることを特徴とする請求項７記載のレンズ駆動装置。     The shape when viewed from the optical axis direction is formed in a substantially square column shape that is a substantially square shape,
    The lens according to claim 7, wherein the four driving magnet portions and the four driving coils are arranged in a rotational symmetry of about 90 ° about the optical axis of the lens. Drive device.
  9. 　前記光軸方向から見たときの形状が略長方形状または略正方形状となる略四角柱状に形成されるとともに、前記駆動機構を制御するための制御部を備え、
    　４個の前記駆動用磁石部および４個の前記駆動用コイルのそれぞれは、前記レンズ駆動装置の四隅のそれぞれに配置され、
    　前記制御部は、前記センサからの出力結果に基づいて、４個の前記駆動用コイルのうちの、前記レンズ駆動装置の周方向で隣り合う２個の前記駆動用コイルのそれぞれに供給される電流の大きさを制御する第３電流制御部と、前記センサからの出力結果に基づいて、残りの２個の前記駆動用コイルのそれぞれに供給される電流の大きさを制御する第４電流制御部とを備えることを特徴とする請求項４から６のいずれかに記載のレンズ駆動装置。     The shape when viewed from the optical axis direction is formed in a substantially rectangular column shape that is a substantially rectangular shape or a substantially square shape, and includes a control unit for controlling the drive mechanism,
    Each of the four driving magnet portions and the four driving coils are arranged at each of the four corners of the lens driving device,
    The control unit supplies current supplied to each of the two driving coils adjacent to each other in the circumferential direction of the lens driving device among the four driving coils based on the output result from the sensor. And a fourth current control unit for controlling the magnitude of the current supplied to each of the remaining two driving coils based on the output result from the sensor. The lens driving device according to claim 4, further comprising:
  10. 　レンズの光軸方向から見たときの形状が略長方形状または略正方形状となるレンズ駆動装置であって、
    　前記レンズを保持し前記光軸方向へ移動可能な可動体と、前記可動体を駆動するための駆動機構とを備え、
    　前記駆動機構は、前記レンズ駆動装置の四隅のそれぞれに配置される略柱状の４個の駆動用磁石部と、略筒状に巻回されて形成される４個の駆動用コイルとを備え、
    　４個の前記駆動用磁石部は、その長手方向が前記光軸方向と略平行になるように配置され、
    　４個の前記駆動用コイルのそれぞれは、その内周面が４個の前記駆動用磁石部の外周面のそれぞれと所定の隙間を介して対向するように配置され、
    　前記駆動用磁石部は、前記駆動用コイルとの対向位置で前記駆動用コイルを通過する磁束が発生するように着磁され、
    　４個の前記駆動用コイルのうちの、前記レンズの光軸を中心とする周方向で隣り合うように配置される２個の前記駆動用コイルは、１本の導線が順次巻回されて形成され、残りの２個の前記駆動用コイルは、他の１本の導線が順次巻回されて形成されていること、または、
    　４個の前記駆動用コイルのそれぞれは、４本の導線のそれぞれが巻回されて形成されるとともに、４個の前記駆動用コイルのうちの、前記レンズの光軸を中心とする周方向で隣り合うように配置される２個の前記駆動用コイルは直列に接続され、残りの２個の前記駆動用コイルは直列に接続されていることを特徴とするレンズ駆動装置。     A lens driving device whose shape when viewed from the optical axis direction of the lens is a substantially rectangular shape or a substantially square shape,
    A movable body that holds the lens and is movable in the optical axis direction, and a drive mechanism for driving the movable body,
    The drive mechanism includes four substantially columnar drive magnet portions disposed at each of the four corners of the lens drive device, and four drive coils formed by being wound in a substantially cylindrical shape,
    The four drive magnet portions are arranged so that the longitudinal direction thereof is substantially parallel to the optical axis direction,
    Each of the four driving coils is arranged such that an inner peripheral surface thereof faces each of the outer peripheral surfaces of the four driving magnet portions with a predetermined gap therebetween,
    The drive magnet portion is magnetized so that a magnetic flux passing through the drive coil is generated at a position facing the drive coil,
    Of the four driving coils, the two driving coils arranged adjacent to each other in the circumferential direction centered on the optical axis of the lens are formed by sequentially winding one conductive wire. The other two driving coils are formed by sequentially winding another one conducting wire, or
    Each of the four driving coils is formed by winding each of the four conductive wires, and the circumferential direction around the optical axis of the lens among the four driving coils. The two driving coils arranged adjacent to each other are connected in series, and the remaining two driving coils are connected in series.
PCT/JP2010/063169 2009-08-18 2010-08-04 Lens drive device WO2011021502A1 (en)

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