CN1280804C - 用于光驱的聚焦控制装置及其方法 - Google Patents
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Abstract
一种应用于用于光驱的聚焦控制装置及其方法,包括耦合器,于跨轨过程中接收偏移信号及光学读取头输出的聚焦误差信号而输出耦合信号。聚焦补偿器,用于接收耦合信号,据以输出聚焦控制信号,以控制光学读取头的位置略为偏离于聚焦点,藉以减少跨轨过程中,循轨误差信号耦合至聚焦误差信号的情形,同时增加伺服系统的稳定度。当跨轨过程结束后,将偏移信号移除,以使光学读取头的位置恢复到聚焦正常的位置上。
Description
技术领域
本发明是有关于聚焦控制装置及其方法,且特别是在光驱系统执行跨轨过程中,利用偏移信号以增加聚焦误差信号稳定度,进而增加伺服系统稳定度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系用于控制光学读取头的位置,使光学读取头所发出的雷射光得以精确的聚焦在光盘片上。第1图是传统光驱示意图。传统光驱100包括传统聚焦控制装置120与光学读取头110,以存取光盘片130。当聚焦误差信号Fe依据由光盘片130所反射之激光束而产生后,聚焦控制装置120即依据聚焦误差信号Fe而产生聚焦控制信号Foo,用于控制光学读取头110的位置,以使光学读取头110所发出的雷射光得以精确的聚焦在光盘片130上。
第2图是聚焦控制装置120示意图,其主要包括模拟数字(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系接收聚焦误差信号Fe,将其数字化后由聚焦补偿器220进行补偿,补偿后的信号则经由D/A转换器230转换成模拟信号后,再输出而成为聚焦控制信号Foo,作为控制光学读取头110位置的控制信号。
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处(pits)与平处(lands)以记录数据。然而在跨轨过程中系利用雷射光扫过多个轨道的表面,因此这时候的聚焦误差信号Fe容易耦合循轨误差信号(Tracking error signal)Te,而使得聚焦误差信号Fe不够精确。请参考第3图,其描绘跨轨过程中的循轨误差信号Te与聚焦误差信号Fe的波形图。明显的,在跨轨过程中,循轨误差信号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在跨轨(Seeking)过程中产生震动,而可能使得伺服系统发生不稳定的情形。
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及其方法,使光学读取头的聚焦较为稳定。
根据上述的目的,本发明提出一种在光电系统执行跨轨过程中,增加伺服系统稳定度的聚焦控制装置,其中该光电系统包含聚焦控制装置,用于发出聚焦控制信号,该光电系统包括光学读取头,用于发射激光束以读取光盘片的数据,且聚焦误差信号得以依据由光盘片所反射的光束而产生,所述聚焦控制装置包括:耦合器,用于接收聚焦误差信号及偏移信号,将其耦合后产生耦合信号;以及聚焦补偿器,用于接收耦合信号,并据以输出聚焦控制信号,以在跨轨过程中控制光学读取头的位置略为偏离于聚焦点。当跨轨过程结束后,将该偏移信号移除,以使光学读取头的位置恢复到聚焦正常的位置上。
根据本发明的另一目的,提出了一种在光电系统执行跨轨过程中,增加伺服系统稳定度的聚焦控制装置,其中该光电系统包含聚焦控制装置,用于发出聚焦控制信号,该光电系统包括光学读取头,用于读取光盘片,该聚焦控制装置包括:模拟数字转换器,用于接收聚焦误差信号,并将该聚焦误差信号数字化后输出数字聚焦误差信号;耦合器,用于在该跨轨过程中接收偏移信号及该数字聚焦误差信号,用于将该数字聚焦误差信号与该偏移信号耦合后据以产生耦合信号;聚焦补偿器,用于接收该耦合信号并据以输出补偿信号;以及数字模拟转换器,用于接收该补偿信号并据以输出该聚焦控制信号,以控制该光学读取头;其中,该偏移信号系用于跨轨过程中与该数字聚焦误差信号耦合,使该光学读取头的聚焦点偏离聚焦点,且当该跨轨过程结束后,该偏移信号被移除而使该光学读取的位置得以恢复至该聚焦点上。
根据本发明的另一目的,提出一种应用于光驱中,用于增加跨轨过程中伺服系统稳定度的聚焦控制方法。该聚焦控制方法包括下列步骤:首先,在跨轨过程开始时产生偏移信号;将偏移信号与聚焦误差信号输入耦合器而相加;由聚焦补偿器接收耦合器之输出;最后输出聚焦控制信号以控制光学读取头,以使跨轨过程中的光学读取头位置偏离正常聚焦点,进而减少循轨误差信号耦合治聚交误差信号的情形,同时增加伺服系统的稳定度。
附图说明
第1图显示了传统光驱示意图。
第2图显示了传统聚焦控制装置示意图。
第3图显示了传统跨轨过程中的循轨误差信号Te与聚焦误差信号Fe的波形图。
第4图显示了依照本发明一较佳实施例的一种光驱示意图。
第5图显示了聚焦控制装置示意图。
第6图显示了依照本发明的一个较佳实施例的光学读取头与光盘片的位置关系图。
【附图标记说明】
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、520:A/D转换器
230、560:D/A转换器
540:耦合器
130、430:光盘片
610:雷射光
具体实施方式
为让本发明的上述目的、特微、和优点能更明显易懂,下文特举一较佳实施例,并配合所附图式,作更详细说明如下:
请参照第4图,其绘示依照本发明一较佳实施例的一种光驱示意图,其包括聚焦控制装置420与光学读取头410,用于发射激光束投射至光盘片430上,用于存取光盘片430的数据。当聚焦误差信号Fe依据由光盘片430所反射的反射光而产生后,聚焦控制装置420则依据偏移信号OF与聚焦误差信号Fe而输出聚焦控制信号Foo,用于控制光学读取头410的位置。
请参照第5图,其绘示为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520、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’。然后,耦合器540接收数字聚焦误差信号Fe’及偏移信号OF,将其耦合后产生耦合信号Fe’_OF。接着聚焦补偿器550接受耦合信号Fe’_OF并据以输出一补偿信号Sc。然后D/A转换器560接收补偿信号Sc并据以输出聚焦控制信号Foo。上述的耦合器540可为一个加法器,用于产生数字聚焦误差信号Fe’及偏移信号OF相加的结果。较佳实施例中所外加的偏移信号OF系于跨轨过程中与数字聚焦误差信号Fe’耦合,使光学读取头的聚焦点稍微偏离光盘片。由于此时的光学读取头已偏离聚焦点,亦即光路较正常聚焦时为差,所以循轨误差信号耦合至聚焦误差信号的情形也降低。易言之,耦合至聚焦误差信号的噪声将减少,于是聚焦误差信号的震动情形将减少,同时增加伺服系统的稳定度。应注意的是,在实际实施上,只需要将光学读取头略为偏移正常聚焦点一些即可,亦即偏移信号OF不需太大。在较佳实施例中,可以取聚焦误差信号的信号峰对峰(Peak-to-peak)值的30分之一的直流电平来实施。当然,熟习本发明技艺者当可依据实际情形变更偏移信号的值,但所有基于本发明较佳实施例精神所为的等效修饰与变更,仍应包含于本发明申请权利要求范围中。
第6图是跨轨过程中,本实施例的光学读取头410与光盘片430的位置关系图。跨轨过程中,偏移信号OF将使光学读取头410稍微远离正常的对焦位置,而使雷射光610的聚焦位置稍微远离光盘片430的表面,以使聚焦误差信号Fe于跨轨过程中所耦合到的噪声,例如是循轨误差信号,可以大为减少。而偏移信号OF例如为一直流信号。此外,本发明较佳实施例所揭露的装置与方法,可应用于任何需要读取光盘片的光电系统,例如CD-ROM碟机(drive)、CD-RW碟机、DVD-ROM碟机、DVD+R碟机、DVD+RW碟机、或DVD-RAM碟机等系统之中,但熟习本发明技术者当可依据其需求,将本发明方法应用在其光学系统中。
本发明上述实施例所公开的聚焦控制装置可以在跨轨过程中使光学读取头的聚焦稳定,不受噪声干扰。而且由于是在跨轨过程中使用,此时并未读取数据,因此聚焦点偏离光盘片并不会有任何不良影响。
综上所述,虽然本发明已以一较佳实施例公开如上,然其并非用于限定本发明,任何熟习此技艺者,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的权利要求所界定者为准。
Claims (10)
1.一种在光电系统执行跨轨过程中,增加伺服系统稳定度的聚焦控制装置,其中该光电系统包含聚焦控制装置,用于发出聚焦控制信号,该光电系统包括光学读取头,用于读取光盘片,所述聚焦控制装置包括:
耦合器,于跨轨过程中接收偏移信号及聚焦误差信号,将该聚焦误差信号与该偏移信号耦合,据以产生耦合信号;以及
聚焦补偿器,用于接收该耦合信号,据以输出该聚焦控制信号,以控制该光学读取头;
其中,该偏移信号系用于跨轨过程中与该聚焦误差信号耦合,使该光学读取头的聚焦点偏离聚焦点,且当该跨轨过程结束后,该偏移信号被移除而使该光学读取的位置得以恢复至该聚焦点上。
2.根据权利要求1所述的聚焦控制装置,其中该光学读取头输出聚焦误差信号,所述聚焦误差信号具有低频误差成分。
3.根据权利要求1所述的聚焦控制装置,其中该耦合器为加法器。
4.根据权利要求1所述的聚焦控制装置,其中该偏移信号为直流信号。
5.一种在光电系统执行跨轨过程中,增加伺服系统稳定度的聚焦控制装置,其中该光电系统包含聚焦控制装置,用于发出聚焦控制信号,该光电系统包括光学读取头,用于读取光盘片,所述聚焦控制装置包括:
模拟数字转换器,用于接收聚焦误差信号,并将该聚焦误差信号数字化后输出数字聚焦误差信号;
耦合器,用于在该跨轨过程中接收偏移信号及该数字聚焦误差信号,用于将该数字聚焦误差信号与该偏移信号耦合后据以产生耦合信号;
聚焦补偿器,用于接收该耦合信号并据以输出补偿信号;以及
数字模拟转换器,用于接收该补偿信号并据以输出该聚焦控制信号,以控制该光学读取头;
其中,该偏移信号系用于跨轨过程中与该数字聚焦误差信号耦合,使该光学读取头的聚焦点偏离聚焦点,且当该跨轨过程结束后,该偏移信号被移除而使该光学读取的位置得以恢复至该聚焦点上。
6.根据权利要求5所述的聚焦控制装置,其中该光学读取头输出聚焦误差信号,所述聚焦误差信号具有低频误差成分。
7.根据权利要求5所述的聚焦控制装置,其中该耦合器为加法器。
8.根据权利要求5所述的聚焦控制装置,其中该偏移信号为直流信号。
9.一种在光电系统执行跨轨过程中,增加伺服系统稳定度的聚焦控制方法,其中该光电系统包括光学读取头及聚焦补偿器,且该光电系统是利用聚焦控制信号以控制该光学读取头的位置以读取光盘片,所述聚焦控制方法包括:
在该跨轨过程中,将偏移信号及聚焦误差信号耦合后产生耦合信号;
将该耦合信号输入该聚焦补偿器后据以输出聚焦控制信号,其中,该偏移信号是用于跨轨过程中与该聚焦误差信号耦合,使该光学读取头偏离聚焦点;以及
当该跨轨过程结束后,该偏移信号被移除而使该光学读取的位置得以恢复至该聚焦点上。
10.根据权利要求9所述的聚焦控制方法,其中该偏移信号为直流信号。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US52071103P | 2003-11-17 | 2003-11-17 | |
US60/520,711 | 2003-11-17 |
Publications (2)
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CN1619668A CN1619668A (zh) | 2005-05-25 |
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