WO2014029296A1 - 一种可实现镜头可控倾斜的音圈马达结构 - Google Patents

一种可实现镜头可控倾斜的音圈马达结构 Download PDF

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Publication number
WO2014029296A1
WO2014029296A1 PCT/CN2013/081595 CN2013081595W WO2014029296A1 WO 2014029296 A1 WO2014029296 A1 WO 2014029296A1 CN 2013081595 W CN2013081595 W CN 2013081595W WO 2014029296 A1 WO2014029296 A1 WO 2014029296A1
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WIPO (PCT)
Prior art keywords
magnet
coil
lens
focus
deflection
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PCT/CN2013/081595
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English (en)
French (fr)
Inventor
钞晨
王彬
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爱佩仪光电技术（深圳）有限公司
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Priority to JP2015527771A priority Critical patent/JP5926460B2/ja
Priority to KR20157006344A priority patent/KR20150045463A/ko
Priority to EP13831279.8A priority patent/EP2887112B1/en
Publication of WO2014029296A1 publication Critical patent/WO2014029296A1/zh
Priority to US14/627,079 priority patent/US9329356B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • 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
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • 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
    • G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
    • 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
    • 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
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • 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
    • 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
    • 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
    • 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
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G03B2205/0023—Movement of one or more optical elements for control of motion blur by tilting or inclining one or more optical elements with respect to the optical axis
    • 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
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0053—Driving means for the movement of one or more optical element
    • G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
    • 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
    • G11B7/0932—Details of sprung supports
    • 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

Definitions

  • the invention discloses a voice coil motor for controlling tilt of a lens, in particular to a voice coil motor structure capable of achieving controlled tilt of the lens.
  • Ai Peiyi Optoelectronics Technology Co., Ltd. has also developed a focus motor that can make the lens controllable tilt, realizes the function of autofocus and optical anti-shake, and realizes the miniaturization breakthrough of the device, making the three-axis motor For the first time, the volume is as small as the traditional single-axis motor, and the power consumption is well controlled, which really paves the way for the application of the three-axis motor in the mobile phone.
  • Ai Peiyi's motor design utilizes several (greater than or equal to) identical actuators distributed around the lens, independently pushing the lens to move in a direction substantially parallel to the optical axis, by controlling each actuator The amount of movement to achieve the focus of the lens and the controllable tilt angle, while the tilt of the lens can produce the equivalent translation of the lens, which can be combined with the gyro sensing control to achieve optical anti-shake shooting.
  • this type of motor has the disadvantages of relatively large mass production difficulty and difficulty in matching with the motor drive circuit, and thus has not been widely promoted in smart phones.
  • the current focus motor of Ai Pei Optoelectronics Technology Co., Ltd. usually uses four identical actuators to push the lens motion together. Each actuator contributes to the focus and deflection of the lens, so four actuators are required to cooperate. Cooperate to precisely control the attitude of the lens.
  • the three control parameters of the motor focus position, the X-direction deflection angle and the Y-direction deflection angle need to be converted into four current parameters for driving the four actuators in order to achieve the required control. Therefore, the control chip needs to be implanted with a complex conversion algorithm.
  • each drive circuit assumes the task of controlling the focus position and deflection angle of the motor.
  • the drive current is a superposition of the current that controls the focus and the current that controls the deflection. Due to the limitation of the dynamic range of the current output of each driver circuit, the change in the magnitude of the focus current will affect the dynamic range of the deflection current, so the two motions of the focus motion and the yaw motion are easily pinned.
  • the present invention provides a new voice coil motor structure capable of achieving controlled tilt of the lens, which
  • the coils are relatively perpendicular to the optical axis and are parallel to each other, wherein one coil independently controls the lens to move in a direction perpendicular to the image sensor to achieve focus of the lens; the remaining coils respectively control the lens for two perpendicular to the light Controllable deflection of the shaft and the mutually orthogonal axes of rotation.
  • a voice coil motor structure capable of realizing controllable tilt of the lens
  • the voice coil motor structure includes a lens mount for fixing the lens, a focus coil, a deflection coil and a magnet, and a focus coil
  • the deflection coils are respectively fixed on the outer side of the lens holder, and the magnets are arranged around the focus coil and the deflection coils, so that the focus coil can interact with the magnets, so that the focus coil drives the lens holder to move back and forth to achieve focus of the lens, and the deflection coil can interact with the magnets.
  • the function is to make the deflection coil drive the lens holder to perform the tilting movement to realize the lens shifting.
  • the focusing coil is provided with one, and the deflection coil is provided with two, which are respectively a first deflection coil and a second deflection coil.
  • the two deflection coils are respectively disposed on two sides of the focus coil, and the focus coil and the deflection coil are parallel to each other and focus.
  • the coil and the deflection yoke are respectively disposed perpendicular to the optical axis of the lens in the lens mount.
  • the magnet is provided with four, wherein the first magnet and the second magnet are a group, and the first magnet and the second magnet are oppositely disposed, and the generated magnetic field mainly acts on the first deflection coil and the focus coil; the third magnet and The fourth magnet is a group, and the third magnet and the fourth magnet are oppositely disposed, and the generated magnetic field mainly acts on the second deflection coil and the focus coil.
  • the second magnet corresponds to the inner pole polarity of the focus coil portion being the same polarity as the inner magnet pole of the first magnet, and the second magnet corresponds to the inner pole polarity of the first deflection coil portion being opposite to the polarity of the inner magnet of the first magnet.
  • the polarity of the inner magnetic pole of the fourth magnet corresponding to the focus coil portion is the same as the polarity of the inner magnetic pole of the third magnet, and the polarity of the inner magnetic pole of the fourth magnet corresponding to the second deflection coil portion is opposite to the polarity of the inner magnetic pole of the third magnet.
  • the outer cover of the lens mount is provided with a metal yoke for shielding the internal and external magnetic fields, and the magnet is fixedly mounted inside the metal yoke.
  • the upper end of the lens holder is provided with a top spring piece, and the lower end of the lens holder is provided with a bottom spring piece, and the lens holder is suspended in the metal yoke through the top spring piece and the bottom spring piece.
  • the top spring piece is respectively insulated with a gasket on the upper and lower sides.
  • the second magnet and/or the fourth magnet adopt a planar two-stage magnetic injection process to realize two magnetic pole polarization directions on the same side on the same magnet, or two magnets with opposite magnetic pole polarization directions. to make.
  • the invention has the beneficial effects that the invention controls the lens by using three coils which are perpendicular to the optical axis and parallel to each other, and the motor structure is completely different from that in the conventional technology, and the lens can be simultaneously focused and controlled tilt angle. .
  • the three-coil structure of the invention maintains important advantages such as miniaturization of the volume, and is easy to mass-produce, and the impedance of the coil is easily matched with the motor drive circuit, and can be widely applied to current smart phones, so that it has the same function as the mid-to-high end digital camera. Photo camera function.
  • the three control parameters of the motor focus position, the X direction deflection angle and the Y direction deflection angle can be directly used to control the three actuators without complicated algorithm conversion, and each coil impedance is just right (about 15 ⁇ ). ), can be well matched with the drive circuit.
  • only three driving circuits can be used to complete the operation, and the circuit structure is simplified. Each drive circuit independently controls three different motions, so that the focus and deflection have their own independent dynamic range and do not pinpoint each other.
  • Figure 1 is a schematic perspective view of the present invention.
  • FIG. 2 is a schematic plan view of the present invention.
  • FIG. 3 is a schematic cross-sectional view of the A-A of FIG. 2.
  • FIG. 4 is a schematic cross-sectional view of the B-B of FIG. 2.
  • Figure 5 is a schematic view showing the structure of the exploded state of the present invention.
  • This embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the present embodiment, and are all within the scope of the present invention.
  • the core component of the present invention is three substantially rectangular coils that are parallel to each other and that are substantially perpendicular to the optical axis (the optical axis, i.e., the central axis of the optical path defined by the imaging lens in the lens). And a combination of several magnets that are carefully arranged around the coil.
  • the coil is provided with three, which is the simplest structure that can achieve the object of the present invention.
  • the number of coils can also be specifically set according to actual needs.
  • One of the three coils in this embodiment is the focus coil 6, and the other two coils are deflection coils, which are the first deflection coil 5 and the second deflection coil 7, respectively, wherein the focus coil 6 is disposed in the middle, and the two deflection coils Set separately on both sides.
  • a magnet is disposed around the focus coil 6.
  • the magnet is provided with four magnets 8, a second magnet 9, a third magnet 10, and a fourth magnet 11, respectively, so that the focus coil 6 is energized.
  • the portion of the focus coil 6 corresponding to each of the magnets will obtain a force in the same direction substantially parallel to the direction of the optical axis, so that the focus coil 6 drives the lens to move back and forth to achieve the focusing function of the lens.
  • the deflection yoke has a magnet distribution only in two opposite directions, and the other two opposite directions have no magnetite distribution, and the polarities of the magnetic poles in opposite directions with respect to the magnet are opposite, so that when the deflection yoke is energized, the two opposing magnets are The coil portion will generate a force in the opposite direction, forming a moment, causing the lens to produce a tilting motion, and the two deflection coils independently control the lens to produce a tilting motion in two orthogonal directions.
  • the magnet is provided with four, and the four magnets are divided into two groups, each set of magnets includes two oppositely disposed magnets, and the two sets of magnets are orthogonally distributed, wherein the opposite first magnet 8 and second magnet 9 are a group, the position of which is upward, the magnetic field generated mainly acts on the first deflection coil 5 and the focus coil 6; the opposite third magnet 10 and the fourth magnet 11 are in a group, and the position thereof is downward, and the magnetic field generated is mainly Acting on the second deflection yoke 7 and the focus coil 6.
  • the magnetic poles of the first magnet 8 and the second magnet 9 are arranged as shown in FIG.
  • the magnetic pole of the first magnet 8 near the inner end is N pole
  • the magnetic pole of the outer end is S pole
  • the second magnet. 9 can use the planar two-stage magnetic injection process to achieve the opposite two polarization directions on one magnet, or two magnetisms with opposite polarization directions, and the second magnet 9 corresponds to the inner side of the focus coil 6
  • One end of the magnetic pole is N pole
  • the outer end of the magnetic pole is S pole
  • the second magnet 9 corresponds to the inner end of the first deflection coil 5 part of the magnetic pole S pole
  • the outer end of the magnetic pole is N pole
  • the third magnet 10 and the fourth Referring to FIG. 3, the magnetic pole of the magnet 11 is shown in FIG.
  • the magnetic pole of the third magnet 10 near the inner end is N pole
  • the magnetic pole of the outer end is S pole
  • the fourth magnet 11 can be magnetized by a plane two-stage magnetization process.
  • the opposite two polarization directions are realized, and two magnets having opposite polarization directions may be respectively used for splicing
  • the fourth magnet 11 corresponds to the inner end of the focus coil 6 and the magnetic pole is N pole
  • the magnetic pole of the outer end is S.
  • Polar fourth magnetic The stone 11 corresponds to the magnetic pole S pole of the inner end of the second deflection yoke 7 portion
  • the magnetic pole of the outer one end is N pole.
  • the magnetic poles of all the magnets can also be reversely arranged, and the current flowing through the coil is also reversed, and the direction of motion of the final motor is unchanged.
  • the present invention also includes other peripheral components.
  • the focus coil 6 and the two deflection coils are fixedly disposed outside the lens mount 12, and the shape of the focus coil 6 and the two deflection coils coincide with the outer shape of the lens mount 12. That is, the focusing coil 6 and the two deflection coils enclose the lens holder 12, and a lens (not shown) is fixedly disposed in the lens holder 12, and the lens holder 12 drives the lens to move together.
  • a top spring piece 3 is fixedly disposed on the top of the lens holder 12, and a bottom spring piece 13 is fixedly disposed at the bottom of the lens holder 12.
  • the lens holder 12 and the focus coil 6 and the two deflection coils constitute a moving part of the present invention, and the moving part passes through the top spring piece 3. And the bottom spring piece 13 is suspended.
  • the top spring piece 3 and the bottom spring piece 13 are formed by a single layer or a plurality of leaf springs, and the rotation axis of the deflection movement can be precisely controlled by controlling the spring coefficient ratio of each layer spring. The position, combined with the control of the coil current, enables focus and controllable deflection of the lens.
  • the elastic properties of the top spring piece 3 and the bottom spring piece 13 are adjusted so that the entire suspension system can allow the moving part to perform the up and down focusing motion, and can also perform the yaw motion in two orthogonal directions perpendicular to the optical axis.
  • a first insulating gasket 2 and a second insulating gasket 4 are fixedly disposed outside the coil, and the top spring piece 3 is disposed between the first insulating gasket 2 and the second insulating gasket 4.
  • the outer outer cover of the present invention is provided with a metal yoke 1 which can be used for adsorbing and fixing the magnet around the periphery of the coil, and can be used to shield the internal and external magnetic fields from mutual interference.
  • the first insulating gasket 2 and the second insulating gasket 4 serve to fix and electrically insulate the top spring piece 3 from the metal yoke 1 and the magnet.
  • the bottom of the metal yoke 1 is fixedly mounted with a bottom case 14, and the bottom spring piece 13 is fixedly mounted on the bottom case 14.
  • the bottom case 14 and the metal yoke 1 are mounted to each other to form a receiving cavity, and the components of the lens mount 12 are mounted on Capacitance inside the cavity.
  • the focus coil 6 when the invention is in use, when the focus coil 6 is energized, the polarities of the opposite magnetic poles are the same, so that the focus coil 6 can generate a force substantially in the same direction along the optical axis, and the lens holder 12 is driven to move back and forth. Focus on the lens.
  • the invention utilizes three coils which are relatively perpendicular to the optical axis and are parallel to each other to control the lens.
  • the motor structure is completely different from that in the conventional technology, and the focus and the controllable tilt angle of the lens can be simultaneously achieved.
  • the three-coil structure of the invention maintains important advantages such as miniaturization of the volume, and is easy to mass-produce, and the impedance of the coil is easily matched with the motor drive circuit, and can be widely applied to current smart phones, so that it has the same function as the mid-to-high end digital camera. Photo camera function.
  • the three control parameters of the motor focus position, the X direction deflection angle and the Y direction deflection angle can be directly used to control the three actuators without complicated algorithm conversion, and each coil impedance is just right (about 15 ⁇ ). ), can be well matched with the drive circuit.
  • only three driving circuits can be used to complete the operation, and the circuit structure is simplified. Each drive circuit independently controls three different motions, so that the focus and deflection have their own independent dynamic range and do not pinpoint each other.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

一种可实现镜头可控倾斜的音圈马达结构，音圈马达结构包括用于固定安装镜头的镜头座（12）、对焦线圈（6）、偏转线圈（5、7）和磁石（8-11），对焦线圈（6）和偏转线圈（5、7）分别固定套装在镜头座（12）外侧，磁石（8-11）排布在对焦线圈（6）和偏转线圈（5、7）四周，使得对焦线圈（6）能够与磁石（8-11）相互作用，使对焦线圈（6）带动镜头座（12）前后运动，实现镜头对焦，偏转线圈（5、7）能够与磁石（8-11）相互作用，使偏转线圈（5、7）带动镜头座（12）做倾斜运动，实现镜头的移轴。本结构可同时实现镜头的对焦与可控倾斜角度，其三线圈结构保持了体积小型化等重要优点，同时易于量产，线圈的阻抗易于与马达驱动电路相匹配，可广泛应用于目前的智能手机中，使其具有与中高端数码相机同样的拍照功能。

Description

一种可实现镜头可控倾斜的音圈马达结构 技术领域
本发明公开一种控制镜头倾斜的音圈马达，特别是一种可实现镜头可控倾斜的音圈马达结构。
背景技术
随着手机生产技术的不断提高，尤其是智能手机的出现以后，手机的功能越来越多，手机的摄像与拍照功能几乎已经成为每个手机的必备功能，随着5M、8M、12M等高像素摄像头在智能手机中的日益普及，使得手机拍照的素质越来越接近数码相机。但是，现有技术中的高像素手机摄像头却通常不含有数码相机的一些光学和机械部件，这种硬件上的缺失，无疑会让拍照手机的拍照效果比数码相机差很多。目前的拍照手机通常最多只有一个自动对焦马达来实现近焦、远焦的转换功能，其对镜头的控制至多是单维度的令镜头靠近或远离图像传感器。而高级的数码相机中，则同时是通过更加复杂的机械装置控制镜头相对于图像传感器进行多维度的运动，例如利用镜头平移来实现光学防抖动（OIS）,以及利用镜头适度倾斜来实现移轴摄影等。
为了使具有拍照功能的手机的摄像效果进一步向数码相机靠拢，不少国际知名的手机对焦马达厂商都开始研发三轴对焦马达，如TDK，Mistumi,富士康等厂商已经开发了基于镜头平移的光学防抖对焦马达。但是这些马达的结构非常复杂，体积和功耗较大，因此一直未能在智能手机市场上推广开来。
爱佩仪光电技术有限公司也为此开发了一款能令镜头产生可控倾斜的对焦马达，实现了自动对焦加光学防抖动的功能，并实现了器件的小型化突破，使得三轴马达的体积第一次做到跟传统单轴马达一样小，功耗也得到了良好控制，真正为三轴马达在手机中的应用铺平了道路。爱佩仪的这款马达设计利用了分布在镜头周边的若干个（大于等于3个）相同致动器，分别独立推动镜头在大致平行于光轴的方向上运动，通过控制每个致动器的移动量来实现镜头的对焦和可控倾斜角度，而镜头的倾斜的同时又能产生镜头的等效平移，从而可结合陀螺仪传感控制实现光学防抖的拍摄效果。然而，该款马达具有量产难度相对较大，不易与马达驱动电路相匹配等缺点，因而也未在智能手机中大量推广。
爱佩仪光电技术有限公司目前的对焦马达通常是采用四个相同的致动器共同推动镜头运动，其中每一个致动器对镜头的对焦和偏转都有贡献，所以需要四个致动器协同配合才能精确控制镜头的姿态。镜头运动时需要将马达对焦位置、X方向偏转角度和Y方向偏转角度这三个控制参量经过复杂的换算，转换成为驱动四个致动器的四个电流参量，才能实现所需要的控制。因此，控制芯片需要植入复杂的转换算法。此种对焦马达中，每个致动器的线圈阻抗偏小（< 10Ω），不利于与驱动电路匹配，且需要四个相同的驱动电路，用以控制四个相互独立的致动器。每个驱动电路都承担了控制马达对焦位置和偏转角度的任务，驱动电流为控制对焦的电流与控制偏转的电流的叠加。由于每个驱动电路的电流输出动态范围的限制，对焦电流的大小变化将影响偏转电流的动态范围，因此对焦运动和偏转运动两种运动容易互相牵制。
 发明内容
针对上述提到的现有技术中智能手机中镜头驱动马达功能简单，或者结构复杂、难于量产等缺点，本发明提供一种新的可实现镜头可控倾斜的音圈马达结构，其通过多个与光轴相对垂直，且彼此间互相平行的线圈组成，其中一个线圈独立控制镜头在垂直于图像传感器的方向上运动，实现镜头的对焦；其余的线圈各自控制镜头分别对于两个垂直于光轴且相互正交的转轴进行可控偏转。
本发明解决其技术问题采用的技术方案是：一种可实现镜头可控倾斜的音圈马达结构，音圈马达结构包括用于固定安装镜头的镜头座、对焦线圈、偏转线圈和磁石，对焦线圈和偏转线圈分别固定套装在镜头座外侧，磁石排布在对焦线圈和偏转线圈四周，使得对焦线圈能够与磁石相互作用，使对焦线圈带动镜头座前后运动，实现镜头对焦，偏转线圈能够与磁石相互作用，使偏转线圈带动镜头座做倾斜运动，实现镜头的移轴。
本发明解决其技术问题采用的技术方案进一步还包括：
所述的对焦线圈设有一个，偏转线圈设有两个，分别为第一偏转线圈和第二偏转线圈，两个偏转线圈分别设置在对焦线圈两侧，对焦线圈和偏转线圈相互平行，且对焦线圈和偏转线圈分别垂直于镜头座内的镜头的光轴设置。
所述的磁石设有四个，其中第一磁石和第二磁石为一组，第一磁石和第二磁石相对设置，其产生的磁场主要作用于第一偏转线圈和对焦线圈；第三磁石和第四磁石为一组，第三磁石和第四磁石相对设置，其产生的磁场主要作用于第二偏转线圈和对焦线圈。
所述的第二磁石对应于对焦线圈部分的内侧磁极极性与第一磁石内侧磁极极性相同，第二磁石对应于第一偏转线圈部分的内侧磁极极性与第一磁石内侧磁极极性相反；第四磁石对应于对焦线圈部分的内侧磁极极性与第三磁石内侧磁极极性相同，第四磁石对应于第二偏转线圈部分的内侧磁极极性与第三磁石内侧磁极极性相反。
所述的镜头座外侧罩装有用于屏蔽内外磁场的金属磁轭，磁石固定安装在金属磁轭内部。
所述的镜头座上端设有顶弹簧片，镜头座下端设有底弹簧片，镜头座通过顶弹簧片和底弹簧片悬挂在金属磁轭内。
所述的顶弹簧片上下两侧分别绝缘垫圈。
所述的第二磁石和/或第四磁石采用平面两级注磁工艺在同一块磁石上实现同一侧相反的两个磁极极化方向，或分别用两个磁极极化方向相反的磁石拼接而成。
本发明的有益效果是：本发明利用三个与光轴相对垂直，彼此互相平行的线圈对镜头进行控制，马达结构与常规技术中的完全不同，其可同时实现镜头的对焦与可控倾斜角度。本发明的三线圈结构保持了体积小型化等重要优点，同时易于量产，线圈的阻抗易于与马达驱动电路相匹配，可广泛应用于目前的智能手机中，使其具有与中高端数码相机同样的拍照功能。本发明中，马达对焦位置、X方向偏转角度和Y方向偏转角度这三个控制参量可直接用来控制三个致动器，不需要复杂算法转换，且每个线圈阻抗正合适(约为15Ω)，可与驱动电路很好配合。本发明中，只需采用三个驱动电路即可完成工作，电路结构简化。每个驱动电路分别独立控制三种不同的运动，使得对焦与偏转都有各自独立的动态范围，不会互相牵制。
下面将结合附图和具体实施方式对本发明做进一步说明。
 附图说明
图1为本发明立体结构示意图。
图2为本发明俯视结构示意图。
图3为图2的A-A剖面结构示意图。
图4为图2的B-B剖面结构示意图。
图5为本发明的分解状态结构示意图。
图中，1-金属磁轭，2-第一绝缘垫圈，3-顶弹簧片，4-第二绝缘垫圈，5-第一偏转线圈，6-对焦线圈，7-第二偏转线圈，8-第一磁石，9-第二磁石，10-第三磁石，11-第四磁石，12-镜头座，13-底弹簧片，14-底壳。
 具体实施方式
本实施例为本发明优选实施方式，其他凡其原理和基本结构与本实施例相同或近似的，均在本发明保护范围之内。
请参看附图1至附图5，本发明的核心部件是三个互相平行，且大致垂直于光轴（光轴即镜头中成像镜片所确定的光路的中心轴）方向的大致为矩形的线圈，以及在线圈四周精心排布的若干个磁石的组合。本实施例中，线圈设置有三个，其为可实现本发明目的的最简结构，具体实施时，也可以根据实际需要具体设置线圈数量。本实施例中的三个线圈中一个为对焦线圈6，另外两个线圈为偏转线圈，分别为第一偏转线圈5和第二偏转线圈7，其中，对焦线圈6设置在中间，两个偏转线圈分别设置在两侧。
对焦线圈6的四周对应设置有磁石，本实施例中，磁石设有四个，分别为第一磁石8、第二磁石9、第三磁石10和第四磁石11，因此当对焦线圈6内通电时，对焦线圈6对应于各磁石的部分将获得大致平行于光轴方向的相同朝向的作用力，从而使得对焦线圈6带动镜头做前后运动，实现镜头的对焦功能。偏转线圈只在两个相对的方向上有磁石分布，另外两个相对方向无磁石分布，且相对有磁石的两个方向的磁极极性相反，这样，当偏转线圈通电时，两个相对磁石的线圈部分将产生方向相反的力，形成一个力矩，使得镜头产生倾斜运动，两个偏转线圈分别独立控制镜头在两个正交的方向上产生倾斜运动。本实施例中，磁石设有四个，四个磁石分成两组，每组磁石包括两个相对设置的磁石，两组磁石呈正交分布，其中相对的第一磁石8和第二磁石9为一组，其位置偏上，其产生的磁场主要作用于第一偏转线圈5和对焦线圈6；相对的第三磁石10和第四磁石11为一组，其位置偏下，其产生的磁场主要作用于第二偏转线圈7和对焦线圈6。本实施例中，第一磁石8和第二磁石9的磁极设置请参看附图4，其中，第一磁石8靠近内侧一端的磁极为N极，靠近外侧一端的磁极为S极，第二磁石9可以用平面两级注磁工艺在一块磁石上实现相反的两个极化方向，也可以分别用两个极化方向相反的磁石拼接而成，第二磁石9对应于对焦线圈6部分的内侧一端磁极为N极，外侧一端的磁极为S极，第二磁石9对应于第一偏转线圈5部分的内侧一端的磁极为S极，外侧一端的磁极为N极；第三磁石10和第四磁石11的磁极设置请参看附图3，其中，第三磁石10靠近内侧一端的磁极为N极，靠近外侧一端的磁极为S极，第四磁石11可以用平面两级注磁工艺在一块磁石上实现相反的两个极化方向，也可以分别用两个极化方向相反的磁石拼接而成，第四磁石11对应于对焦线圈6部分的内侧一端磁极为N极，外侧一端的磁极为S极，第四磁石11对应于第二偏转线圈7部分的内侧一端的磁极为S极，外侧一端的磁极为N极。具体实施时，所有的磁石的磁极也可以全部反向设置，同时控制流过线圈的电流也反向，则最终马达的运动方向不变。
除了上述核心部件外，本发明中还包括其他外围部件，对焦线圈6和两个偏转线圈固定套装在镜头座12外侧，对焦线圈6和两个偏转线圈的形状与镜头座12的外部形状相吻合，即对焦线圈6和两个偏转线圈包裹镜头座12，镜头（图中未画出）固定设置在镜头座12内，由镜头座12带动镜头一起运动。镜头座12顶部固定设置有顶弹簧片3，镜头座12底部固定设置有底弹簧片13，镜头座12以及对焦线圈6和两个偏转线圈构成本发明的运动部分，运动部分通过顶弹簧片3和底弹簧片13悬挂起来，本实施例中，顶弹簧片3和底弹簧片13由单层或多层片状弹簧形成，通过控制各层弹簧的弹性系数比例，可以精确控制偏转运动的转轴位置，结合线圈电流的控制，可实现镜头的对焦与可控偏转。本实施例中，顶弹簧片3和底弹簧片13的弹性属性要调节到整个悬挂系统既能允许运动部分做上下对焦运动，又能在垂至于光轴的两个正交方向上做偏转运动。线圈外侧固定设有第一绝缘垫圈2和第二绝缘垫圈4，顶弹簧片3设置在第一绝缘垫圈2和第二绝缘垫圈4之间。本发明整体外侧罩装有一个金属磁轭1，金属磁轭1可将磁石用来吸附固定在线圈的周边，同时可用来屏蔽内外磁场，使其不会产生相互干扰。第一绝缘垫圈2和第二绝缘垫圈4用来将顶弹簧片3与金属磁轭1和磁石相固定并实现电绝缘。金属磁轭1底部固定安装有底壳14，底弹簧片13固定安装在底壳14上，底壳14与金属磁轭1相互安装在一起，形成一个容置腔，镜头座12的部件安装在容置腔内。
本发明在使用时，当对焦线圈6通电时，其四周相对的磁极极性相同，因此对焦线圈6可以产生一个大致沿光轴且方向相同的作用力，带动镜头座12做前后运动，从而实现镜头的对焦。当第一偏转线圈5通电时，由于其对应的第一磁石8和第二磁石9磁极相反，因此会产生一个方向相反的作用力，构成一个力矩，带动镜头座12朝第一磁石8或第二磁石9的方向倾斜；当偏转线圈7通电时，其对应的第三磁石10和第四磁石11磁极相反，因此产生一个方向相反的作用力，构成一个力矩，带动镜头座12朝第三磁石10或第四磁石11的方向倾斜。因此通过控制三个线圈的电流，可分别独立控制镜头的对焦运动和沿两个正交转轴的倾斜运动。
本发明利用三个与光轴相对垂直，彼此互相平行的线圈对镜头进行控制，马达结构与常规技术中的完全不同，其可同时实现镜头的对焦与可控倾斜角度。本发明的三线圈结构保持了体积小型化等重要优点，同时易于量产，线圈的阻抗易于与马达驱动电路相匹配，可广泛应用于目前的智能手机中，使其具有与中高端数码相机同样的拍照功能。本发明中，马达对焦位置、X方向偏转角度和Y方向偏转角度这三个控制参量可直接用来控制三个致动器，不需要复杂算法转换，且每个线圈阻抗正合适(约为15Ω)，可与驱动电路很好配合。本发明中，只需采用三个驱动电路即可完成工作，电路结构简化。每个驱动电路分别独立控制三种不同的运动，使得对焦与偏转都有各自独立的动态范围，不会互相牵制。

Claims (8)

  1. 一种可实现镜头可控倾斜的音圈马达结构，其特征是：所述的音圈马达结构包括用于固定安装镜头的镜头座、对焦线圈、偏转线圈和磁石，对焦线圈和偏转线圈分别固定套装在镜头座外侧，磁石排布在对焦线圈和偏转线圈四周，使得对焦线圈能够与磁石相互作用，使对焦线圈带动镜头座前后运动，实现镜头对焦，偏转线圈能够与磁石相互作用，使偏转线圈带动镜头座做倾斜运动，实现镜头的移轴。
  2. 根据权利要求1所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的对焦线圈设有一个，偏转线圈设有两个，分别为第一偏转线圈和第二偏转线圈，两个偏转线圈分别设置在对焦线圈两侧，对焦线圈和偏转线圈相互平行，且对焦线圈和偏转线圈分别垂直于镜头座内的镜头的光轴设置。
  3. 根据权利要求2所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的磁石设有四个，其中第一磁石和第二磁石为一组，第一磁石和第二磁石相对设置，其产生的磁场主要作用于第一偏转线圈和对焦线圈；第三磁石和第四磁石为一组，第三磁石和第四磁石相对设置，其产生的磁场主要作用于第二偏转线圈和对焦线圈。
  4. 根据权利要求3所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的第二磁石对应于对焦线圈部分的内侧磁极极性与第一磁石内侧磁极极性相同，第二磁石对应于第一偏转线圈部分的内侧磁极极性与第一磁石内侧磁极极性相反；第四磁石对应于对焦线圈部分的内侧磁极极性与第三磁石内侧磁极极性相同，第四磁石对应于第二偏转线圈部分的内侧磁极极性与第三磁石内侧磁极极性相反。
  5. 根据权利要求1至4中任意一项所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的镜头座外侧罩装有用于屏蔽内外磁场的金属磁轭，磁石固定安装在金属磁轭内部。
  6. 根据权利要求5所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的镜头座上端设有顶弹簧片，镜头座下端设有底弹簧片，镜头座通过顶弹簧片和底弹簧片悬挂在金属磁轭内。
  7. 根据权利要求5所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的顶弹簧片上下两侧分别绝缘垫圈。
  8. 根据权利要求4所述的可实现镜头可控倾斜的音圈马达结构，其特征是：所述的第二磁石和/或第四磁石采用平面两级注磁工艺在同一块磁石上实现同一侧相反的两个磁极极化方向，或分别用两个磁极极化方向相反的磁石拼接而成。
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