CN1096066C - 光学信息记录媒体 - Google Patents

光学信息记录媒体 Download PDF

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CN1096066C
CN1096066C CN96106145.6A CN96106145A CN1096066C CN 1096066 C CN1096066 C CN 1096066C CN 96106145 A CN96106145 A CN 96106145A CN 1096066 C CN1096066 C CN 1096066C
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recording media
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CN1144372A (zh
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樫原俊昭
谷井清
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085Pits
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055Disposition or mounting of transducers relative to record carriers
    • G11B11/10576Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • G11B11/10578Servo format, e.g. prepits, guide tracks, pilot signals
    • 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
    • G11B7/0938Disposition 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
    • 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24073Tracks
    • G11B7/24079Width or depth

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  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

一种记录媒体,其特征在于,将预先记录信息提供给市场的控制信息坑点部区域3的光道间距作得比该媒体1内连续纹槽的数据记录区域2中的光道间距大,使两区域中的跟踪信号调制度基本相等。因而,该记录媒体可稳定地重放记录。

Description

光学信息记录媒体
本发明涉及可记录擦除高密度信息的光盘。可记录重放、擦除高密度信息的光盘,为了对其进行高速访问及高速处理数据,各条光道被分割成多个扇区,通过坑点预先形成光道地址和扇区号。通常,与光盘相关的驱动控制信息涉及多条光道,并且用坑点形成在光盘上,当将光盘插入驱动器时,驱动器具有读入该控制信息,设定其各种条件的功能。已有的光盘不管是可记录信息的区域还是控制信号区域,光道间距是固定不变的。因此,跟踪光道用的跟踪伺服机构不工作状态下的差动信号振幅,如图4所示,在连续纹槽部大,而在具有控制信息的坑点部,为了在无坑点部分不产生跟踪信号,该振幅降低到跟踪信号4的约1/3,从而存在跟踪伺服不稳定的问题。
如上所述,在预先利用坑点结构或光道变形形成控制信号的区域中,比之至少由一定连续区间的光道构成、用以记录用户信息的数据记录区域内,跟踪差动信号振幅低得多。其结果,因差动信号的S/N下降,电气、光学偏差影响增大等而产生损害跟踪伺服稳定性的问题。再有,随着光道间距变小,控制信号信息读出调制度也下降。其结果产生有损于控制信息读出可靠性的问题。
本发明鉴于上述问题,提出一种信息记录媒体。为了谋求对读出可靠性要求高的控制信息记录区域的跟踪伺服稳定,并抑制读出信号调制度下降,该信息记录媒体具有控制信息记录区域的区域形状不同于连续纹槽数据记录区域的状态结构,也即作为这类几何形状要素的轨道间距、轨道宽度、轨道宽度与轨道间宽之比或轨道深度的至少任一种发生变化,其变化前提是跟踪信号振幅在数据记录区域和控制信息记录区域中基本一样。
或进一步而言,在具有用反射率将跟踪信号归一化的放大控制电路的系统中,其有效条件是在数据记录区域和控制信息记录区域中使跟踪信号振幅与反射率之比(即跟踪调制度)基本一样。
通过将上述的控制信息记录区域的坑点宽度作得比连续纹槽数据区域的槽宽窄,就能提高重放时的调制度。通过将控制信息记录区域的光道间距作得比连续纹槽数据记录区域的光道间距大,就能增大跟踪差动信号振幅,从而使记录重放装置中的跟踪伺服动作稳定,并能提高读取控制信息的可靠性。
再有,通过将控制信息记录区域的坑点深度作得比连续纹槽部深度(通常为λ/8,λ为重放激光波长)深,也能改善重放时的信号调制度。
下面结合附图详细说明本发明的实施例。
图1表示本发明一实施例光盘结构的顶视图。
图2为本发明实施例中跟踪差动信号的波形图。
图3表示本发明实施例光盘结构主要部分的斜视图。
图4为已有技术的跟踪差动信号的波形图。
图1表示第一实施例。该图为光盘1上表面的结构图,控制信息信号坑点部的光道3形成在光盘的内周。控制信息信号坑点部和数据记录区域都用扇区划分,各个扇区有用于访问的地址信号。在作为数据记录区域的连续区域2的光道间距为1.2μm,控制信号记录区域的控制信息信号坑点部区域3的光道间距为1.6μm时,从数据记录区域2运行到控制信息信号坑点部区域后的跟踪差动信号,如图2所示,能补偿因控制信息信号坑点部坑点零散引起的跟踪差动信号振幅下降,使之相对于连续纹槽部基本不变。通常,控制信息信号坑点部至少分布在两条以上的光道上进行记录。区域转接部分遍及大约有1至10条光道,因而用连续纹槽设置转接区,使光道间距为1.6μm也是有效的。
按照如上构成,能使两区域跟踪信号振幅基本相同。虽然作为一例说明了各光道间距取1.2μm、1.6μm的情况,但这些间距根据所用激光波长和汇聚光点的光学系统的条件而改变,所以上述以外的其它间距值也完全有可能。
上述实施例是以跟踪信号振幅一致为例进行说明的,但在涉及本发明的进行记录重放的已有装置中,大多包含用反射率除以伺服信号使振幅归一化的电路。因此以上述装置为对象的光盘为例,取作为数据记录区域的连续纹槽区域2的光道间距为1.2μm,取作为控制信号记录区域的控制信息信号坑点部区域3的光道间距为1.4-1.5μm,又设控制信息坑点部区域中因坑点散射而反射率低,随着反射率低跟踪信号振幅也低。在这样条件下,通过记录重放装置中用反射率归一化的增益控制电路后,从数据记录区域2运行到控制信息信号坑点部区域的跟踪差动信号如图2所示,基本相等,能更稳定。通过上述条件选择,以跟踪误差信号的调制度在控制信息记录区域和其以外区域中基本相等为目的,改变光道间距,从而能获得稳定的跟踪差动信号。
在上述实施例中对控制信息坑点部区域设在最内周附近进行说明,但并不限于此,根据光盘与其记录重放装置的接口规范,也可设在最外周、进而可设在中央部分,还不仅可设在一处,而且设在最内周、最外周、中间等多处也是可以的。
下面,说明抑制跟踪差动信号振幅下降的另一实施例。
通常是利用这种情况,即跟踪信号调制度(用反射率归一化的振幅)取决于激光光点半值宽度的直径与光道间距的关系,在半值宽度与光道宽度基本一致,即光道充填系数接近1时,跟踪调制度变得最大。但本实施例的情况下,着眼于在连续光道部分使半值宽度比光道宽度大,跟踪调制度低一些时,确定光盘的规范,而在控制信息记录区域设定跟踪调制度最大的光道间距。本实施例的场合,光道间距在数据记录区域约为1.2μm,在控制信息坑点部区域中约为1.5μm,补偿了跟踪信号振幅下降部分,实现了整体上基本相同的跟踪调制度,从而能进行稳定的记录重放。
随着高密度记录要求,光道间距进一步变小时,必须保持激光光点半值宽度与光道宽度的关系基本不变,因而成为光道间宽度比光道宽度小的状态。此时光道间宽度与光道宽度之比(光道宽度比)在1以下。光道间距大时光道间宽度变大,光道宽度比大于1。
图3表示另一实施例,在图3中,5,5b为控制信息坑点部坑点阵的图解,表示记录控制信息的2个例子,5表示各凹坑分离排列的情况,5b表示以连续纹槽的变形实现近似坑点的形状。通常,一个光盘上统一为某一种形式。6表示数据记录区域中采用连续纹槽的记录光道,用于记录用户信息。连续纹槽的一部分以同一深度,用5所示那样的断续光道纹槽的形态记录着地址数据或扇区数据,但图中未示。如上所述,作为几何条件,通过改变控制信息坑点部区域中光道深度d1相对于其以外区域中光道深度d2的深度,就能抑制控制信息记录区域中跟踪信号振幅下降。连续纹槽部跟踪信号调制度最大时的纹槽深度为λ/8。然而,当光道间距进一步缩短时,为了保证成形复制性,最好设定得比λ/8浅些。由于控制信息坑点部为不连续的凹凸构造,即使将其设定得与λ/8相等或更深,也能获得足够的复制性。
本发明的实质就是进行上述组合,在控制信息坑点部区域和其以外区域中使跟踪信号振幅、跟踪调制度一致。
本发明虽以光盘进行说明,但不限于光盘状媒体,不言而喻,也可应用于卡状、其它形状等光学记录媒体。
如上所述,按照本发明,在具有控制信息记录区域的记录媒体中,该记录区域以光道纹槽的断续或其变形记录着地址信息,且在特定区域中连续地记录着地址信息和其它的控制信息,通过使光道间距或光道宽度比、深度等几何条件在控制信息记录区域和其以外的数据区域中不同,能使两区域中的跟踪调制度、跟踪信号振幅在特定的记录重放装置条件下基本相等,以简单结构取得记录重放时的稳定性和提高可靠性的良好效果。

Claims (11)

1.一种光学信息记录媒体,备有:
包含多个光道的数据记录光道区(2),所述光道具有连续纹槽形式;
包含2个或多个具有不连续形式用于记录控制信息的控制信息光道区(3),其中,控制信息光道区(3)的跟踪信号振幅与数据记录光道区(2)的跟踪信号振幅相等;
其特征在于,
控制信息光道区(3)中的光道间距比其它区中的大。
2.如权利要求1所述的光信息记录媒体,其特征在于,所述控制信息光道区(3)进一步在光道宽度与光道间隔的比、光道深度、和跟踪调制度的至少参数之一不同,所述跟踪调制度是控制信息光道区(3)的跟踪信号与同一区中记录膜的反射率的比,其中,其它区中的跟踪调制度与控制信息光道区(3)中的相比基本相等。
3.如权利要求1所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)的差别在于光道宽度与光道间隔之比不同。
4.如权利要求2所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)的差别在于光道宽度与光道间隔之比不同。
5.如权利要求3所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)中的光道宽度与光道间隔之比近似为1,而其它区中的两者之比小于1。
6.如权利要求1至5任一权利要求所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)的差别在于光道深度不同。
7.如权利要求6所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)的光道深度比其它区的光道深度大。
8.如权利要求1任一权利要求所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)的进一步差别在于,光道宽度与光道间隔之比、光道深度的至少参数之一不同。
9.如权利要求1所述的光信息记录媒体,其特征在于,进一步包含能够记录和重放、或记录、重放和揩除信息信号的记录层。
10.如权利要求1所述的光信息记录媒体,其特征在于,其中,所述控制信息光道区(3)可设置在光盘的内周部。
11.如权利要求1所述的光信息记录媒体,其特征在于,所述控制信息光道区(3)可设在光盘的外周部。
CN96106145.6A 1995-04-21 1996-04-19 光学信息记录媒体 Expired - Fee Related CN1096066C (zh)

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DE69623378D1 (de) 2002-10-10
EP0740289A1 (en) 1996-10-30
DE69623378T2 (de) 2003-01-09
JPH08293129A (ja) 1996-11-05
US5793741A (en) 1998-08-11
CN1144372A (zh) 1997-03-05
EP0740289B1 (en) 2002-09-04

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