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    Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing
    1.
    发明授权
    Multiple data layer optical disk drive system with fixed aberration correction and optimum interlayer spacing 失效
    具有固定像差校正和最佳层间距的多数据层光盘驱动系统

    公开(公告)号：US5625609A

    公开(公告)日：1997-04-29

    申请号：US403166

    申请日：1995-03-13

    申请人： Milton R. Latta ,  Hal J. Rosen ,  Kurt A. Rubin ,  Wade Wai-Chung Tang

    发明人： Milton R. Latta ,  Hal J. Rosen ,  Kurt A. Rubin ,  Wade Wai-Chung Tang

    IPC分类号： G11B7/1378 ,  G11B7/00 ,  G11B7/005 ,  G11B7/24 ,  G11B7/252

    CPC分类号： G11B7/24 ,  G11B7/005 ,  G11B2007/0013

    摘要： A multiple data layer optical disk drive system has fixed aberration correction and uses a disk with maximum interlayer spacing for reduced interlayer crosstalk. In one embodiment the multiple data layer disk has a substrate with a thickness that is reduced by approximately one-half the thickness of the spacer layer that separates the first and last data layers. The disk is designed to operate with a lens that has spherical aberration correction to compensate for the thickness of a conventional single data layer disk. This allows the disk drive to handle multiple data layer disks as well as to be backward compatible and thus handle conventional single data layer disks. The thickness of the substrate material plus one-half the thickness of the spacer layer material (which may have a different index of refraction than the substrate material) is equivalent, for purposes of spherical aberration correction, to the thickness of the substrate material used in the conventional single data layer disk. The focused spot with minimum spherical aberration is thus located at the middle of the spacer layer rather than on the first data layer. The spacer layer thickness is selected so that when the focused spot is located on either the first or last data layer there is some deliberately designed spherical aberration, although an amount that is acceptable. As a result the thickness of the spacer layer can be significantly increased to thereby reduce interlayer crosstalk. In another embodiment that substrate thickness and spacer layer thickness are selected and then the lens is corrected for spherical aberration corresponding to the thickness of substrate material plus one-half the thickness of spacer layer material.

    摘要翻译： 多数据层光盘驱动系统具有固定的像差校正，并且使用具有最大层间距的盘来减少层间串扰。 在一个实施例中，多数据层盘具有基板，其厚度减小了分隔第一和最后数据层的间隔层的厚度的大约二分之一。 该盘被设计成与具有球面像差校正的透镜一起工作以补偿常规单个数据层盘的厚度。 这允许磁盘驱动器处理多个数据层磁盘以及向后兼容，从而处理传统的单个数据层磁盘。 衬底材料的厚度加上间隔层材料的厚度的一半（与衬底材料相比可能具有不同的折射率）相当于用于球面像差校正的基底材料的厚度 传统的单数据层磁盘。 因此，具有最小球面像差的聚焦点位于间隔层的中间而不是位于第一数据层上。 选择间隔层厚度，使得当聚焦点位于第一或最后数据层上时，存在一些故意设计的球面像差，尽管可接受的量。 结果，间隔层的厚度可以显着增加，从而减少层间串扰。 在另一个实施例中，选择衬底厚度和间隔层厚度，然后针对与衬底材料的厚度加上间隔层材料的厚度的一半的球面像差校正透镜。

    Optical data storage system with multiple write-once phase-change recording layers
    2.
    发明授权
    Optical data storage system with multiple write-once phase-change recording layers 失效
    具有多个一次写入相变记录层的光学数据存储系统

    公开(公告)号：US5555537A

    公开(公告)日：1996-09-10

    申请号：US497518

    申请日：1995-06-30

    申请人： Wayne I. Imaino ,  Hal J. Rosen ,  Kurt A. Rubin ,  Wade W.-C. Tang

    发明人： Wayne I. Imaino ,  Hal J. Rosen ,  Kurt A. Rubin ,  Wade W.-C. Tang

    IPC分类号： G11B7/0045 ,  G11B7/243 ,  G11B7/257 ,  G11B7/00 ,  G11B5/66 ,  G11B7/24

    CPC分类号： G11B7/257 ,  G11B7/24038 ,  G11B7/243 ,  G11B2007/24306 ,  G11B2007/24308 ,  G11B2007/2431 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/2432 ,  G11B2007/25706 ,  G11B2007/25708 ,  G11B2007/25716 ,  G11B7/00454 ,  G11B7/24009 ,  G11B7/24012

    摘要： An optical disk drive uses an optical disk with spatially separated multiple phase-change WORM recording layers. The optical disk has a light transmissive substrate onto which the laser light is incident. The substrate supports at least two spatially separated multi-film recording stacks, each stack including an active recording layer of phase-change WORM material. The disk is either an air-gap structure wherein each recording stack is supported on a separate substrate and the substrates are separated by an air-gap, or a solid structure wherein a solid light transmissive spacer layer separates the recording stacks. Each of the recording stacks located between the substrate on which the laser light is incident and the farthest recording stack includes an active phase-change recording layer and an optical interference film in contact with the recording layer. The recording layer is made sufficiently thin to have good light transmissivity, but at this low thickness, without any other layers, is not sufficiently reflective to act as a recording layer with suitable servo and recording performance. The optical interference film in contact with the recording layer has a high index of refraction relative to the adjacent recording layer and spacer to increase the optical interference effect in the recording stack. The optical interference film optimizes the contrast, reflectivity and transmissivity of the recording stack. The optical interference film has low absorption so that laser light can pass through it to focus on a farther recording layer. This allows the farther recording layers to be written using reasonable laser power.

    摘要翻译： 光盘驱动器使用具有空间分离的多相变WORM记录层的光盘。 光盘具有入射激光的透光基板。 衬底支撑至少两个空间分离的多层记录堆叠，每个堆叠包括相变WORM材料的活性记录层。 磁盘是气隙结构，其中每个记录堆叠被支撑在单独的基板上，并且基板被气隙分离，或者固体透光隔离层分离记录堆叠的固体结构。 位于其上入射的基板和最远的记录堆叠之间的记录堆叠中的每一个包括与记录层接触的有源相变记录层和光学干涉膜。 记录层被制成足够薄以具有良好的光透射率，但是在没有任何其它层的这个低厚度下，不能充分反射以用作具有适当的伺服和记录性能的记录层。 与记录层接触的光学干涉膜相对于相邻的记录层和间隔物具有高的折射率，以增加记录堆叠中的光学干涉效应。 光学干涉膜优化了记录堆叠的对比度，反射率和透射率。 光学干涉膜具有低吸收，使得激光可以通过它来聚焦在更远的记录层上。 这允许使用合理的激光功率写入更远的记录层。