Optical data storage system with multiple layer media
    2.
    发明授权
    Optical data storage system with multiple layer media 失效
    具有多层介质的光数据存储系统

    公开(公告)号:US06574174B1

    公开(公告)日:2003-06-03

    申请号:US09549075

    申请日:2000-04-15

    IPC分类号: G11B700

    摘要: An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a conventional single layer optical disk. The optical data storage system comprises an optical medium having a single dedicated servo layer and multiple data stacks which each contain an embedded servo format, a servo laser beam positioned to maintain a first focus point on the dedicated servo reference layer, a read-write laser beam positioned to maintain a second focus point on one of the data stacks, a first, dedicated servo system which provides focus and tracking error correction according to error signals generated from the dedicated servo layer, and a second, embedded servo system which provides focus and tracking error correction according to error signals generated from the data stacks. The dedicated servo layer, in different embodiments of the invention, may be positioned either below or above the data stacks in the optical medium, or interposed between data stacks. The data stacks may comprise discrete physical data layers or “virtual” data layers defined by a format hologram. The servo and read-write lasers may differ in wavelength and/or polarization.

    摘要翻译: 一种使用包括多个数据层或堆叠的光学存储介质的光学信息存储系统,其中多个数据堆栈中的每一个具有与常规单层光盘相当的存储密度。 光学数据存储系统包括具有单个专用伺服层的光学介质和各自包含嵌入式伺服格式的多个数据堆栈,定位成将第一焦点保持在专用伺服参考层上的伺服激光束,读写激光器 光束定位成在数据堆叠之一上保持第二焦点,第一专用伺服系统,其根据从专用伺服层产生的误差信号提供聚焦和跟踪误差校正;以及第二嵌入式伺服系统,其提供焦点和 根据从数据堆产生的误差信号进行跟踪误差校正。 在本发明的不同实施例中的专用伺服层可以位于光学介质中的数据堆的下方或上方,或者位于数据堆之间。 数据堆可以包括由格式全息图定义的离散物理数据层或“虚拟”数据层。 伺服和读写激光器的波长和/或极化可能不同。