CN101652813B - 具有延迟跳层的光盘驱动器 - Google Patents

具有延迟跳层的光盘驱动器 Download PDF

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CN101652813B
CN101652813B CN2008800110729A CN200880011072A CN101652813B CN 101652813 B CN101652813 B CN 101652813B CN 2008800110729 A CN2008800110729 A CN 2008800110729A CN 200880011072 A CN200880011072 A CN 200880011072A CN 101652813 B CN101652813 B CN 101652813B
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CN101652813A (zh
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O·S·马利克
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Koninklijke Philips NV
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • G11B7/0908Disposition 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 for focusing only
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • G11B7/0946Disposition 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 operation during external perturbations not related to the carrier or servo beam, e.g. vibration
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • G11B7/0948Disposition 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B2007/0003Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

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Abstract

一种能够处理具有至少两个存储层(61,62)的光盘(2)的光盘驱动器(1),包括:可轴向移动的物镜(34)以及用于控制物镜的轴向位置的聚焦致动器(52);控制电路(90),用于产生针对聚焦致动器的致动器控制信号(SQF);以及阈值源(98),用于提供低于聚焦致动器的供电电压(Vs)的阈值电平(VT)。控制电路(90)监控聚焦干扰信号,并在聚焦干扰信号的绝对值太高的情况下延迟跳层。具体地,控制电路比较干扰信号的绝对值与所述阈值电平,如果该绝对值高于所述阈值电平,则抑制(83)跳层直至干扰信号的绝对值变得低于所述阈值电平。

Description

具有延迟跳层的光盘驱动器
技术领域
本发明总体涉及光记录领域。更为具体地,本发明涉及用于处理多层光盘的光盘驱动设备;下文中,这样的盘驱动设备还被称为“光盘驱动器”。本发明总体涉及任何类型的盘,尤其涉及DVD和BD。
背景技术
如所公知的,光存储盘包括存储空间的连续螺旋形式或多同心圆形式的至少一个轨道,该存储空间中可以以数据模式来存储信息。光盘可以是只读类型,在制造期间将信息记录在其中,该信息只能被用户读取。光存储盘还可以是可写类型,用户可向其中存储信息。
对于将信息写入光存储盘的存储空间中,或者从盘中读取信息,光盘驱动器一方面包括:用于接收和旋转光盘的旋转装置,另一方面还包括用于产生光束(典型为激光束)并用所述激光束扫描存储轨道的光扫描装置。由于光盘技术(信息可存储于光盘的方式以及可从光盘读取光数据的方式)一般已为大众所知,因此在此不必详细描述该技术。
光扫描装置包括用于将光束聚焦于盘上的焦点的物镜。在操作期间,焦点应保持与轨道对准或者应能够从当前轨道被移动到新的轨道。为此,至少物镜被径向可移动地安装,且光盘驱动器包括用于控制物镜的径向位置的径向致动器装置。此外,光束应保持聚焦在盘上。为此,物镜被可轴向移动地设置,且光盘驱动器包括用于控制物镜的轴向位置的聚焦致动器装置。
信息轨道被物理地设置在盘的存储层中。除了仅具有一个存储层的盘之外,已经开发了具有彼此叠置的两个存储层的盘。应注意,盘甚至可能具有三个或更多存储层,不过在下文中将针对双层盘的情况解释本发明。
发明内容
当向盘写信息时,该信息通常被连续地写入一个轨道中。然而,该轨道可能没有足够的空间供连续写入。当可用空间充满时,必定跳转到同一轨道的另一位置,或不同层的轨道的另一位置。以下,跳转到不同层的位置将被称为“跳层”。
同样,有可能在读取时必须进行跳层,因为用户发出命令,要求从不同于当前层的层读取信息。
执行跳层需要在较大的距离上移动物镜,并且为了快速完成,需要较大的聚焦致动器驱动信号。针对该致动器的通用供电电压是12V。不过,近来的开发趋向较低电压,例如5V。现在,在聚焦致动器驱动信号上存在某种干扰的情况下可能出现问题。如果该干扰的值相对较高,则用于该致动器驱动信号的余量不足。该致动器信号可能缩减,并且跳转可能不能被正确地执行。
本发明的目的是减少该问题。
根据本发明,监控聚焦致动器驱动信号上的干扰,并将其与阈值进行比较。如果干扰电平太高,则禁止跳层。
其他有利之处在从属权利要求中提及。
附图说明
本发明的这些以及其它方面、特征和优点将进一步通过以下的参考附图的一个或多个优选实施例来阐明,在附图中相同的附图标记表示相同或相似的部件,并且在附图中:
图1示意性图示了光盘驱动器;
图2是显示作为时间的函数的致动器信号的曲线图;
图3是显示作为时间的函数的致动器信号以及阈值电平的曲线图;
图4是说明按照本发明所采取的步骤的流程图。
具体实施方式
图1示意性图示了适于将信息存储在光盘2上或者从光盘2读取信息的光盘驱动设备1,光盘2典型地为DVD或BD。为了旋转盘2,盘驱动设备1包括固定于框架(为简化起见未示出)、用于限定旋转轴5的电动机4。为了容纳并保持盘2,盘驱动设备1可包括转盘或夹紧毂盘6,其在主轴电动机4的情况下被安装在电动机4的主轴7上。
盘驱动设备1还包括用于通过光束扫描盘2的轨道(未示出)的光学系统30。更具体地,在图1所示的示例性设置中,光学系统30包括被设置用于产生光束32的光束产生装置31,典型为诸如激光器二极管的激光器。下文中,将用添加到附图标记32的符号a、b、c等来表示光束32的光学路径的不同部分。
光束32穿过分束器33和物镜34(光束32b)到达盘2。光束32b从盘2反射(反射的光束32c)并穿过物镜34和分束器33(光束32d)到达光学检测器35。
物镜34被设计用于将光束32b聚焦到盘2的记录层上的焦点F,该焦点F通常是圆形的。在放大情况下,图上示出了盘2包括平行设置的两个记录层61、62。
盘驱动设备1还包括致动器系统50,该系统包括用于将物镜34相对于盘2进行径向移动的径向致动器51。由于径向致动器本身是公知的,同时本发明不涉及这种径向致动器的设计和运行,因此不必在此详细讨论径向致动器的设计和运行。
为了实现并维持正确地聚焦在所期望的记录层上,所述物镜34被可轴向移动地安装,另外致动器系统50还包括聚焦致动器52,其被设置用于将物镜34相对于盘2进行轴向移动。由于轴向致动器本身是公知的,而另外这种轴向致动器的设计和操作不是本发明的主题,因此在此不必详细讨论这种聚焦致动器的设计和操作。
注意,用于将物镜相对于设备框架进行支撑的装置、以及用于轴向和径向移动物镜的装置本身通常是公知的。由于这种支撑和移动装置的设计和操作不是本发明的主题,因此不必在此详细讨论其设计和操作。
还应注意,径向致动器51和聚焦致动器52可以实现为一个集成的2D-致动器。
盘驱动设备1还包括控制电路90,该控制电路具有耦合到径向致动器51的控制输入端的第一输出端91、具有连接到聚焦致动器52的控制输入端的第二输出端92、以及具有耦合到电动机4的控制输入端的第三输出端94。控制电路90被设计用于:在其第一输出端91处产生用于控制径向致动器51的控制信号SCR,在其第二控制输出端92处产生用于控制聚焦致动器52的控制信号SCF,以及在其第三输出端93处产生用于控制电动机4的控制信号SCM
控制电路90还具有用于从光学检测器35接收读取信号SR的读取信号输入端95。
图2是说明与执行跳层相关联的问题的曲线图;横轴代表时间,纵轴代表信号电平(伏特)。聚焦致动器控制信号SCF是两个贡献的和。第一贡献(如曲线71所示)是典型的正弦形信号并且需要用来补偿轴向上的干扰以便保持光束聚集在记录层上。第二贡献(如阻挡信号72所示)需要用来执行跳层。该第二贡献(其将被称为跳转控制信号)包括两个信号部分72a和72b,其中第一信号部分72a导致物镜的加速,而与第一信号部分72a相比符号相反的第二信号部分72b导致物镜的减速。
图2还显示了所述两个信号的和(曲线73)。图2还显示了向致动器供电的供电电压Vs。现在,如在74所示,可以看到存在的问题是所述两个贡献(虚线所示)的和会大于供电电压Vs。在这种情况下,实际的致动器控制信号(实线所示)将小于所预期的致动器控制信号(虚线所示),并且跳层将不精确。
图3是类似于图2的曲线图,现在示出本发明所提出的方案。除了干扰控制信号71和跳转控制信号72以外,该图显示了低于供电电压Vs的阈值电平VT,该阈值电平由阈值源98提供给控制电路90。如果干扰控制信号71的绝对值高于阈值电平VT,则控制电路90阻止跳转控制信号72被发出。假设是希望从t1时刻执行跳转,而在t1时刻不希望使干扰控制信号71的绝对值高于阈值电平VT。在那种情况下,跳转将被推迟到干扰控制信号71的绝对值变得低于阈值电平VT的t2时刻。这样,针对跳转控制信号72一直有Vs-VT的余量。
图4是说明按照本发明由控制电路90所采取的步骤的流程图。对于该说明,跳层在轴向方向上是向前还是向后是不重要的。
在步骤81中,控制电路90接收信号,该信号表示应预期在下一可能的时机执行跳层。
在步骤82中,控制电路90读取聚焦干扰信号,并在步骤83中,控制电路90将该聚焦干扰信号与阈值电平VT进行比较。
如果显示出聚焦干扰信号的绝对值高于阈值电平VT,则控制电路90返回步骤83。这种情形持续到显示出聚焦干扰信号的绝对值低于阈值电平VT,此时步骤84中的控制电路90产生跳转控制信号从而执行跳层。
这样,跳层被有效地延迟直到聚焦干扰信号的绝对值足够低。
应注意,上述操作是在控制电路90预期到不久将要进行跳层时执行的,而不必当即执行。在那种情况下,允许控制电路90进行等待,同时发出跳层控制信号。然而,还有可能由外部条件指示跳层的时刻,例如由于盘驱动器正从盘上读取电影,而该盘上的电影信息从一层跳转到另一层。
总之,本发明提供了光盘驱动器1,其能够处理具有至少两个存储层61,62的光盘2,该光盘驱动器1包括可轴向移动的物镜34以及用于控制物镜的轴向位置的聚焦致动器52;
控制电路90,用于产生用于聚焦致动器的致动器控制信号SCF
以及,阈值源98,用于针对聚焦致动器提供低于供电电压Vs的阈值电平VT
控制电路90监控聚焦干扰信号,并在聚焦干扰信号的绝对值太高的情况下延迟跳层。
具体地,控制电路比较干扰信号的绝对值和所述阈值电平,如果该绝对值高于所述阈值电平,则抑制(步骤83)跳层直到干扰信号的绝对值变得低于所述阈值电平。
尽管已经在附图和前述说明中详细图示并描述了本发明,但是本领域技术人员应清楚,这样的图示和描述应被认为是说明性或示例性的,而非限制性的。本发明不限于所公开的实施例;而是在所附权利要求中所限定的本发明的保护范围内可能进行多种变化和修改。
从附图、公开及所附权利要求的学习中,本领域的技术人员在实施所要求保护的发明的过程中能够理解并实现针对所公开实施例的其它变化。在权利要求中,词语“包括”不排除其它的元素或步骤,并且不定冠词“一”不排除多个。单个处理器或其它单元可以实现权利要求中所记载的多项功能。在彼此不同的从属权利要求中叙述特定措施的纯粹事实不表明这些措施的组合不能被有利地利用。计算机程序可以存储/分布在适当介质(如光存储介质,或与其它硬件一起提供或作为其它硬件的一部分的固态介质)上,还可以以其它形式比如通过因特网或其它有线或无线电信系统来分布。权利要求中的任何附图标记不应被理解为对范围的限制。
以上参考框图对本发明作了解释,所述框图图示了按照本发明的设备的功能块。应理解,这些功能块中的一个或多个可以以硬件实现,其中这样的功能块的功能由独立的硬件部件来执行,而且这些功能块中的一个或多个还可以以软件来实现,使得这样的功能块的功能由计算机程序或诸如微处理器、微控制器、数字信号处理器等可编程设备的一个或多个程序行来实现。

Claims (2)

1.一种用于控制能够处理具有至少两个存储层(61,62)的光盘(2)的光盘驱动器(1)的方法,该盘驱动器包括可轴向移动的物镜(34)以及用于控制物镜的轴向位置的聚焦致动器(52);
所述方法包括以下步骤:
限定阈值电平(VT)低于用于聚焦致动器的供电电压(Vs);
接收指示趋近的跳层的信号;
将聚焦致动器控制信号(SCF)的干扰信号的绝对值与所述阈值电平进行比较;
如果聚焦致动器控制信号的干扰信号的绝对值高于所述阈值电平,则抑制跳层直至聚焦致动器控制信号的干扰信号的绝对值变得低于所述阈值电平(83)。
2.一种能够处理具有至少两个存储层(61,62)的光盘(2)的光盘驱动器(1),该盘驱动器包括:
可轴向移动的物镜(34)以及用于控制物镜的轴向位置的聚焦致动器(52);
控制电路(90),用于产生针对聚焦致动器的致动器控制信号(SCF);
阈值源(98),用于提供低于聚焦致动器的供电电压(Vs)的阈值电平(VT);
所述控制电路(90)被设计用于执行权利要求1的方法。
CN2008800110729A 2007-04-05 2008-04-01 具有延迟跳层的光盘驱动器 Expired - Fee Related CN101652813B (zh)

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US6256273B1 (en) * 1997-07-10 2001-07-03 Pioneer Electronic Corporation Focusing control apparatus for optimally directing light onto a recording surface

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JP3688484B2 (ja) * 1998-11-20 2005-08-31 パイオニア株式会社 光学式記録媒体のドライブ装置
JP2002190121A (ja) * 2000-12-19 2002-07-05 Hitachi Ltd 光学的情報記録再生装置
JP2003091836A (ja) * 2001-09-17 2003-03-28 Toshiba Corp サーボ制御回路、半導体集積回路、光ディスク装置及びサーボ制御方法

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CN1050637A (zh) * 1989-09-30 1991-04-10 德国汤姆森-勃朗特有限公司 检测电路
US6091680A (en) * 1997-06-27 2000-07-18 Pioneer Electronic Corporation Focus control apparatus
US6256273B1 (en) * 1997-07-10 2001-07-03 Pioneer Electronic Corporation Focusing control apparatus for optimally directing light onto a recording surface

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