CN1164735A - 用于光学拾波器的三轴运动执行器 - Google Patents

用于光学拾波器的三轴运动执行器 Download PDF

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CN1164735A
CN1164735A CN96102282A CN96102282A CN1164735A CN 1164735 A CN1164735 A CN 1164735A CN 96102282 A CN96102282 A CN 96102282A CN 96102282 A CN96102282 A CN 96102282A CN 1164735 A CN1164735 A CN 1164735A
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optical pick
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姜声浩
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Samsung Electronics Co Ltd
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    • 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
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    • 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
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    • 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
    • G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
    • 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
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    • 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
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    • 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
    • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
    • 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
    • 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
    • G11B7/0953—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 eccentricity of the disc or disc tracks
    • 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

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Abstract

用于光学拾波器的三轴运动执行器，带有：一个透镜支架，带有两个与光盘轨道径向相平行的侧平面和两个与光盘轨道切向相平行的侧平面；多个悬架，用来支承透镜支架；第一和第三磁铁，安装在基座上分别面对着与光盘轨道径向相平行的两个侧平面；第二和第四磁铁，安装在基座上分别面对着与光盘轨道切向相平行的两个侧平面；一个聚焦线圈，缠绕在透镜支架上，及第一至第四跟踪线圈，连接到聚焦线圈上分别面对着第一至第四磁铁。

Description

用于光学拾波器的 三轴运动执行器
本发明涉及一种用于光学拾波器的执行器，更明确地说，涉及一种用于光学拾波器的三轴运动执行器，该执行器能在三轴方向移动物镜。
通常，光学拾波器在径向跨越光盘运动的同时，以非接触的方式在/从记录介质，即光盘上记录和/或播放信息。
这种光学拾波器包括一个物镜，该物镜用来把从光源发出的光会聚到光盘上的特定焦点。该物镜安装在一个执行器内，沿跟踪或聚焦方向运动，以便在光盘上的预定位置处产生一个预定直径的光点。
图1是用于光学拾波器的传统执行器的示意立体图。
如图所示，用于光学拾波器的传统执行器包括：一个基座11、一个固定到基座11上的支架13、一个用来固定物镜15的线圈架17、一个用来把线圈架17连接到支架13上的悬架19、和一个用来沿跟踪或聚焦方向移动线圈架17的磁驱动装置。
该磁驱动装置带有：一个缠绕在线圈架17上的聚焦线圈21；连接在聚焦线圈21上的诸跟踪线圈23；一对磁铁25a和25b；一对安装在基座11上分别用来固定磁铁25a和25b的外磁轭27a和27b；及一对固定到基座11上位于聚焦线圈21与线圈架17之间的内磁轭29a和29b，用来引导线圈架17。这里，跟踪线圈23连接到聚焦线圈21上使其面对着各自的磁铁25a和25b。
在如上构成的用于光学拾波器的传统执行器中，当把电流加到聚焦线圈21和跟踪线圈23上时，根据弗来明(Fleming)左手定则，在垂直于所加电流和磁铁25a和25b的磁场方向上产生一个力。这个力在跟踪方向即Y轴方向和聚焦方向即Z轴方向移动线圈架17和物镜15。这里，利用加到聚焦线圈21和跟踪线圈23上的电流方向和电流强度来控制物镜15的运动。
然而，用于光学拾波器的传统执行器，既不带有用来控制光盘倾斜的装置，又不带有用来补偿光盘轨道切向误差的装置。
例如，用于低密度盘如光盘(CD)的一般光学拾波器产生相当大的光点，因而光盘的倾斜和光盘轨道的切向误差小得可以忽略。与此不同，例如，用于高密度盘如数字视盘(DVD)的光学拾波器在盘上产生的光点很小，由此导致盘的切向误差很显著。因此，传统执行器不能用于高密度盘的光学拾波器。
本发明的目的在于提供一种用于光学拾波器的三轴运动执行器，该执行器不仅可在跟踪和聚焦方向上移动物镜，而且在光盘轨道的切向移动物镜以便控制光盘轨道的切向误差。
为了实现上述目的，提供了一种用于光学拾波器的三轴运动执行器，该执行器包括：一个基座；一个位于一个光轴上的物镜；一个透镜支架，它带有两个与光盘轨道的径向相平行的侧平面和两个与光盘轨道的切向相平行的侧平面，物镜被固定到该支架上；多个用来支承该透镜支架的悬架，从而使该透镜支架可以在基座上方运动；安装在基座上分别面对着与光盘轨道径向相平行的两个侧平面的第一和第三磁铁；安装在基座上分别面对着与光盘切向相平行的两个侧平面的第二和第四磁铁；一个缠绕在透镜支架上以便垂直于光轴的聚焦线圈；及连接到聚焦线圈上分别面对着第一至第四磁铁的第一至第四跟踪线圈。
通过参照附图详细描述本发明的最佳实施例，将会更加明白上述目的和本发明的优点。在附图中：
图1是用于光学拾波器的常规执行器的示意立体图；
图2是根据本发明用于光学拾波器的三轴运动执行器的示意立体图；及
图3是根据本发明用于光学拾波器的三轴运动执行器的俯视图。
如图2和3中所示，根据本发明用于光学拾波器的三轴运动执行器带有一个基座31；一个透镜支架33，它带有安装在其上的一个物镜32并安装在基座31上；围绕着透镜支架33安装在基座31上的磁铁34a、34b、34c和34d；一个缠绕在透镜支架33上的聚焦线圈35；多个连接到聚焦线圈35上的跟踪线圈36a-36h；及多个用来支承透镜支架33的悬架37，以致于使透镜支架33可跨越基座31运动。
基座31安装在滑架(没表示)上并在光盘(没表示)的径向(Y轴)运动。
物镜32位于一个光轴上，并把从光学拾波器的光源(没表示)发出的光会聚到光盘上。
透镜支架33可以是八角形的柱状物如图2中所示、正方形柱状物、或圆柱，并带有两个与光盘轨道切向即X轴方向相平行的侧平面33a和33c及两个与光盘径向即Y轴方向相平行的侧平面33b和33d。
第一和第三磁铁34a和34c安装在基座31上，分别面对着透镜支架33的侧平面33a和33c；而第二和第四磁铁34b和34d安装在基座31上，分别面对着透镜支架33的侧平面33b和33d。磁铁34a-34d最好是永久磁铁。磁铁34a-34d的S极面对着透镜支架33，而其N极则背对着透镜支架33，或者反过来布置。
聚焦线圈35缠绕在透镜支架33的侧面33a-33d上，以便垂直于光轴。这样，通过加到聚焦线圈35上的电流与磁铁34a-34d之间的相互作用，使物镜32沿聚焦方向即沿Z轴上下运动。
通过磁铁34a-34d与流过跟踪线圈36a-36h的电流之间的相互作用，使透镜支架33沿X和Y轴运动。跟踪线圈36a-36h安装在侧平面33a-33d的边界区域内，即两个侧平面相交处。这样，得到四对跟踪线圈，即，第一对跟踪线圈36a和36b、第二对跟踪线圈36c和36d、第三对跟踪线圈36e和36f、及第四对跟踪线圈36g和36h。跟踪线圈36a-36h的每一个被透镜支架33的侧平面33a-33d之间的边界线33′分成两部分。电流平行于光轴流经这两部分，并且两部之一面对着对应的磁铁。
就是说，第一跟踪线圈36a和36b及第三跟踪线圈36e和36f的每一部分分别面对着第一和第三磁铁34a和34c，并且沿X轴方向移动透镜支架33。第二跟踪线圈36c和36d及第四跟踪线圈36g和36h的每一部分分别面对着第二和第四磁铁34b和34d，并且沿Y轴方向移动透镜支架33。
例如，电流以相同方向流经第一跟踪线圈36a和36b的各自部分，这些部分面对着第一磁铁34a。如果把电流逆时针加到跟踪线圈36a上，则电流向下流经跟踪线圈36a中面对着第一磁铁34a的那一部分，即左部分。这里，把电流顺时针加到跟踪线圈36b上，并由此电流向下流经跟踪线圈36b中面对着第一磁铁34a的那一部分，即右部分。
以与第一跟踪线圈36a和36b相同的方式，把电流加到第二、第三、和第四跟踪线圈36c和36d、36e和36f、及36g和36h上。因此，由于流经面对着磁铁34a-34d的诸线圈部分的电流方向相同，所以施加到透镜支架33上的力在一个方向上。
诸悬架37的每一个都是弹性偏移元件并能够伸缩。每个悬架37的一端固定到透镜支架33上，而其另一端固定到安装在基座31的支承件38上。
在面对着磁铁34a-34d的诸侧面附近在透镜支架33的上表面上，最好形成四个通孔39a-39d。可以进一步提供多个分别安装在通孔39a-39d内的内磁轭件40a-40d，用来引导透镜支架33。此外，还可以进一步提供外磁轭件41a-41d，这些外磁轭件连接到磁铁34a-34d的背面上，以便使磁铁34a-34d能牢固地安装在基座31上。
根据本发明用于光学拾波器的上述三轴运动执行器除在跟踪和聚焦方向能移动物镜之外，还能在光盘轨道的切向移动物镜。因而，能够修正聚焦、跟踪、和切向误差，这就使该执行器能广泛用于高密度盘的光学拾波器。

Claims (11)

1.一种用于光学拾波器的三轴运动执行器，它包括：
一个基座；
一个位于一个光轴上的物镜；
一个透镜支架，带有两个与光盘轨道径向相平行的侧平面及两个与光盘轨道切向相平行的侧平面，所述物镜固定到该透镜支架上；
多个悬架，用来支承所述透镜支架从而使所述透镜支架可在所述基座上方运动；
第一和第三磁铁，安装在所述基座上分别面对着与光盘轨道径向相平行的所述两个侧平面；
第二和第四磁铁，安装在所述基座上分别面对着与光盘轨道切向相平行的所述两个侧平面；
一个聚焦线圈，缠绕在所述透镜支架上以便垂直于所述光轴；及
第一至第四跟踪线圈，连接在所述聚焦线圈上分别面对着第一至第四磁铁。
2.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，所述跟踪线圈的每一个带有一对相互分离的线圈，每个线圈的一个部分平行于所述光轴并面对着所述诸磁铁的一个，并且电流以相同方向流经每个线圈的所述部分。
3.根据权利要求2所述的用于光学拾波器的三轴运动执行器，其中，所述跟踪线圈的所述两个线圈缠绕成匝，并把电流顺时针加到所述两个线圈之一上，而把电流逆时针加到另一个线圈上。
4.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，所述透镜支架为八角柱状物形状。
5.根据权利要求4所述的用于光学拾波器的三轴运动执行器，其中，所述跟踪线圈的每一个带有一对缠绕成匝的线圈，每匝被所述透镜支架的所述侧平面之间的边界线分成两部分，并且所述两部分之一面对着所述诸磁铁中的一个。
6.根据权利要求5所述的用于光学拾波器的三轴运动执行器，其中，把电流顺时针加到所述线圈之一上，而把电流逆时针加到另一个线圈上。
7.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，所述诸磁铁的N极面对着所述透镜支架。
8.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，所述诸磁铁的S极面对着所述透镜支架。
9.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，所述悬架由弹性材料构成，并且所述悬架的一端固定到所述透镜支架上，而其另一端固定到安装在所述基座的支承件上。
10.根据权利要求1所述的用于光学拾波器的三轴运动执行器，其中，在面对着所述诸磁铁的诸侧面附近，在所述透镜支架的上表面上形成四个通孔，并且在所述各个通孔内进一步提供多个内磁轭件以引导所述透镜支架。
11.根据权利要求1所述的用于光学拾波器的三轴运动执行器，还包括多个连接到所述各个磁铁的外表面上以支承所述磁铁的外磁轭件。
CN96102282A 1995-06-15 1996-06-14 用于光学拾波器的三轴运动执行器 Pending CN1164735A (zh)

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US6885536B1 (en) * 2001-08-31 2005-04-26 The Texas A&M University System Method and apparatus for magnetically generating motion with high precision
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JP4154985B2 (ja) * 2002-10-02 2008-09-24 松下電器産業株式会社 光ピックアップ装置及び光ディスク装置
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JP2008122594A (ja) * 2006-11-10 2008-05-29 Konica Minolta Opto Inc レンズ駆動装置
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KR102565728B1 (ko) * 2023-03-07 2023-08-11 (주)애니텍코리아 하방 취출형 담배 수납 트레이 커버 및 하방 취출형 담배 수납 트레이

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JP2728496B2 (ja) * 1989-04-21 1998-03-18 株式会社日立製作所 対物レンズ駆動装置
KR960007895B1 (ko) * 1993-11-29 1996-06-15 대우전자 주식회사 광학디스크플레이어용 광픽업엑츄에이터
US5579175A (en) * 1994-02-18 1996-11-26 Samsung Electronics Co., Ltd. Actuator for optical equipment capable of reducing the number of coils to necessary to move an objective lens in a tracking direction and a focusing direction
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