CN1305048C - 用于光驱的聚焦控制装置及其方法 - Google Patents

用于光驱的聚焦控制装置及其方法 Download PDF

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CN1305048C
CN1305048C CNB2004100957442A CN200410095744A CN1305048C CN 1305048 C CN1305048 C CN 1305048C CN B2004100957442 A CNB2004100957442 A CN B2004100957442A CN 200410095744 A CN200410095744 A CN 200410095744A CN 1305048 C CN1305048 C CN 1305048C
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赖义麟
蔡金印
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Via Technologies Inc
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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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
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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
    • G11B7/0948—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 detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
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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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
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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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration
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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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
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Abstract

一种应用于光驱的聚焦控制装置及其方法。在接收跟踪误差信号与聚焦误差信号后，随即以滤波器将跟踪误差信号的高频信号滤掉，并在调整其振幅后输出一校正信号，再以校正信号去除聚焦误差信号的一低频误差部分，以使聚焦误差信号耦合的跟踪误差信号低频误差部分可去除，而补偿器则利用该耦合信号产生聚焦控制信号，用以在聚焦操作程序中控制光学读取头的位置。

Description

用于光驱的聚焦控制装置及其方法
技术领域
本发明是有关于一种聚焦控制装置及其方法，且特别是应用于光驱的聚焦控制装置及其方法。
背景技术
在光驱的伺服信号中，聚焦误差信号(Focusing error signal)Fe是用以控制光学读取头的位置，使光学读取头所发出的激光得以精确的聚焦在光盘片上。图1是传统光驱100的示意图，其包括聚焦控制装置120与光学读取头110，以存取光盘片130。光学读取头110依据光盘片130的反射光而输出聚焦误差信号Fe，聚焦控制装置120则依据聚焦误差信号Fe而输出聚焦控制信号Foo，用以控制光学读取头110的位置。
图2是聚焦控制装置120示意图，其包括模拟数字(Analog-to-digital，A/D)转换器210、聚焦补偿器220及数字模拟(Digital-to-analog，D/A)转换器230。A/D转换器210接收聚焦误差信号Fe，将之数字化后由聚焦补偿器220进行补偿，然后经由D/A转换器230输出聚焦控制信号Foo，以控制光学读取头110的位置，而使光学读取头所发出的激光能精确的聚焦在光盘片上。
然而，由于光驱内部噪声干扰多而影响各个伺服信号，而使得光学读取头无法精确对焦。此外，因光盘片的表面具有多个轨道，而每个轨道上又利用凹坑(pits)与平台(lands)以记录数据。然而在跨轨过程中是利用激光扫过多个轨道的表面，因此这时候的聚焦误差信号Fe容易耦合跟踪误差信号(Tracking error signal)Te，而使得聚焦误差信号Fe不够精确。请参考图3，其描绘跨轨过程中的跟踪误差信号Te与聚焦误差信号Fe的波形图。明显的，在跨轨过程中，跟踪误差信号Te中的低频成分会耦合到聚焦误差信号Fe中，因此使聚焦误差信号Fe无法确实反应实际上激光聚焦的状态，进而使得光学读取头无法精确对焦。
发明内容
有鉴于此，本发明的目的就是在提供一种应用于光驱的聚焦控制装置与方法，使聚焦误差信号可除去造成误差的低频部分，而使光学读取头所发出的激光得以精确的聚焦在光盘片上。
根据本发明的目的，提出一种光驱，用以读取一光盘片，优选实施例中的光驱包括：一光学读取头，用以读取光盘片的数据后输出一聚焦误差信号及一跟踪误差信号；以及一聚焦控制装置。该聚焦控制装置包括：一滤波器，用以将跟踪误差信号滤除高频信号后输出一校正信号；一耦合器，用以接收聚焦误差信号及校正信号，并将聚焦误差信号减去校正信号以除去聚焦误差信号的低频误差成分除去后而产生一耦合信号；以及一聚焦补偿器，用以接收耦合信号，并据以输出一聚焦控制信号以控制光学读取头。
根据本发明的另一目的，提出一种应用于光学仪器的聚焦控制方法，用以使光学读取头可更精准的聚焦在光盘片上。聚焦控制方法包括下列步骤：首先接收光学读取头输出的跟踪误差信号及聚焦误差信号；随后将跟踪误差信号滤除高频后与聚焦误差信号输入耦合器；接着由耦合器将聚焦误差信号的低频误差成分除去；再由聚焦补偿器接收耦合器的输出后输出聚焦控制信号。
本发明还提供一种光电系统的聚焦控制装置，用以接收一跟踪误差信号及一聚焦误差信号，并据以输出一聚焦控制信号，以控制该光电系统的光学读取头的位置，而使该光学读取头所发出的激光能精确的聚焦在一光盘片上，该聚焦控制装置包括：一滤波器，用以滤除该跟踪误差信号的高频信号后输出一校正信号；一耦合器，用以接收该聚焦误差信号及该校正信号，且依据该校正信号而将该聚焦误差信号的低频误差部分去除以产生一耦合信号；以及一聚焦补偿器，用以接收该耦合信号，并据以输出该聚焦控制信号。
本发明还提供一种光电系统的聚焦控制装置，用以接收一跟踪误差信号及一聚焦误差信号，并据以输出一聚焦控制信号，以控制该光电系统的光学读取头的位置，而使该光学读取头所发出的激光能精确的聚焦在一光盘片上，该聚焦控制装置包括：第一模拟数字转换器，用以接收该跟踪误差信号并数字化后输出一数字跟踪误差信号；第二模拟数字转换器，用以接收该聚焦误差信号并数字化后输出一数字聚焦误差信号；一滤波器，用以将该数字跟踪误差信号滤除高频后输出一校正信号；一耦合器，用以接收该数字聚焦误差信号及该校正信号，且依据该校正信号而将该聚焦误差信号的低频误差部分去除以产生一耦合信号；一聚焦补偿器，用以接收该耦合信号并据以输出一补偿信号；以及一数字模拟转换器，用以接收该补偿信号并据以输出该聚焦控制信号。
附图说明
图1绘示乃传统光驱示意图。
图2绘示乃传统聚焦控制装置示意图。
图3绘示乃跨轨过程中的跟踪误差信号Te与聚焦误差信号Fe的波形图。
图4绘示乃依照本发明一优选实施例的一种光驱示意图。
图5绘示乃依照本发明一优选实施例的一种聚焦控制装置示意图。
附图标号说明
100：传统光驱
120：聚焦控制装置
400：光驱
420：聚焦控制装置
110、410：光学读取头
220、550：聚焦补偿器
210、510、520：A/D转换器
230、560：D/A转换器
540：耦合器
530：滤波器
130、430：光盘片
具体实施方式
为让本发明的上述目的、特征、和优点能更明显易懂，下文特举一优选实施例，并配合所附图式，作更详细说明如下：
请参照图4，其绘示依照本发明一优选实施例的一种光驱示意图。光驱400包括聚焦控制装置420与光学读取头410，以存取光盘片430。当跟踪误差信号Te与聚焦误差信号Fe是依据光盘片430的反射光而产生后，聚焦控制装置420随即依据跟踪误差信号Te与聚焦误差信号Fe而输出聚焦控制信号Foo，并回授至光学读取头410以控制光学读取头410。
请参照图5，其绘示为依照本发明一优选实施例的一种聚焦控制装置示意图。聚焦控制装置420包括模拟数字(Analog-to-digital，A/D)转换器510、520、滤波器530、耦合器540、聚焦补偿器550、及数字模拟(Digital-to-analog，D/A)转换器560。A/D转换器510用以接收跟踪误差信号Te并数字化后输出一数字跟踪误差信号。同样地，A/D转换器520接收聚焦误差信号Fe并数字化后输出一数字聚焦误差信号Fe’。接着，滤波器530滤除数字跟踪误差信号的高频信号后输出校正信号Te’。应注意的是，就一般而言滤波器530是个低通滤波器，它会在滤除跟踪误差信号Te的高频信号后，同时也达到调整跟踪误差信号Te的振幅的效果，于是聚焦误差信号Fe便有一个较规则的低频误差成分来做补偿。然后，耦合器540接收数字聚焦误差信号Fe’及校正信号Te’，并将数字聚焦误差信号Fe’减去校正信号Te’，用以将聚焦误差信号的低频误差成分除去后，而产生耦合信号。接着聚焦补偿器550接受耦合信号并据以输出一补偿信号。然后D/A转换器560接收补偿信号并据以输出聚焦控制信号Foo。
由于聚焦误差信号Fe包含一低频误差成分，此成分是由跟踪误差信号Te的低频耦合而来，如图3所示。数字跟踪误差信号经由滤波器滤除高频后仅保留低频部分，并据以输出一校正信号Te’。耦合器540依据校正信号Te’而将数字聚焦误差信号Fe’的低频误差成分去除所产生耦合信号Fe”，基本上已可精确地反应实际上激光聚焦的状态，于是可使聚焦补偿器550可以正确地输出聚焦控制信号Foo，并使得光学读取头得以精确对焦在光盘片上。
综上所述，虽然本发明已以一优选实施例揭露如上，然其并非用以限定本发明，本领域技术人员，在不脱离本发明的精神和范围内，当可作各种的更动与润饰，因此本发明的保护范围当视所附权利要求所界定者为准。

Claims (7)

1.一种光电系统的聚焦控制装置，用以接收一跟踪误差信号及一聚焦误差信号，并据以输出一聚焦控制信号，以控制该光电系统的光学读取头的位置，而使该光学读取头所发出的激光能精确的聚焦在一光盘片上，该聚焦控制装置包括：
一滤波器，用以滤除该跟踪误差信号的高频信号后输出一校正信号；
一耦合器，用以接收该聚焦误差信号及该校正信号，且依据该校正信号而将该聚焦误差信号的低频误差部分去除以产生一耦合信号；以及
一聚焦补偿器，用以接收该耦合信号，并据以输出该聚焦控制信号。
2.如权利要求1所述的聚焦控制装置，该聚焦控制装置还包括：
第一模拟数字转换器，用以接收该跟踪误差信号并数字化后输出到滤波器；
第二模拟数字转换器，用以接收该聚焦误差信号并数字化后输出到耦合器；和
数字模拟转换器，用以接收聚焦补偿器的聚焦控制信号并转换成模拟信号。
3.如权利要求1所述的聚焦控制装置，其中该滤波器将该跟踪误差信号滤除该高频信号后并调整该跟踪误差信号的振幅后输出而成为该校正信号。
4.一种光学仪器的聚焦控制方法，用以接收该光学仪器的一光学读取头输出的一跟踪误差信号及一聚焦误差信号后并据以输出一聚焦控制信号，据以控制该光学读取头的位置，而使该光学读取头所发出的激光能精确的聚焦在光盘片上，该聚焦控制方法包括下列步骤：
滤除该跟踪误差信号的高频信号后用以输出一校正信号；
依据该校正信号以去除该聚焦控制信号中的低频误差成分后产生一耦合信号；以及
将该耦合信号输入一聚焦补偿器，据以输出该聚焦控制信号。
5.如权利要求4所述的聚焦控制方法，其中在该滤波步骤中，滤除该跟踪误差信号的该高频信号且调整该跟踪误差信号的振幅后而成为该校正信号。
6.一种光驱，用以读取一光盘片，该光驱包括：
一光学读取头，用以产生一激光束投射至该光盘片表面，并依据由该光盘片表面所反射的激光束据以输出一聚焦误差信号及一跟踪误差信号；以及
一聚焦控制装置，包括：
一滤波器，用以跟踪误差信号滤除该跟踪误差信号的高频信号后输出一校正信号；
一耦合器，用以接收该聚焦误差信号及该校正信号，依据该校正信号以去除该聚焦控制信号中的低频误差成分后产生一耦合信号；以及
一聚焦补偿器，用以接收该耦合信号，并据以输出一聚焦控制信号以控制该光学读取头的位置，而使该光学读取头所发出的激光能精确的聚焦在光盘片上。
7.如权利要求6所述的光驱，其中该滤波器在滤除该跟踪误差信号的该高频信号后并调整该跟踪误差信号的振幅而成为该校正信号。
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