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    • 5. 发明授权
    • Multi-stage focus actuator and optical head
    • 多级聚焦执行器和光头
    • US08385178B2
    • 2013-02-26
    • US12977412
    • 2010-12-23
    • Xeufeng WangJohn Erik HersheyZhiyuan RenXiaohong Li
    • Xeufeng WangJohn Erik HersheyZhiyuan RenXiaohong Li
    • G11B7/00
    • G11B7/083G11B7/0927G11B2007/0009
    • Techniques are provided for using a multi-stage actuator to actuate one or more optical components of an optical head. The multi-stage actuator includes a cross-layer displacement component which actuates an optical component to change the beam focus in a displacement range corresponding to the thickness of the data layers in a holographic disk, such that a beam is impinged on the target data layer. The multi-stage actuator also includes a intra-layer focusing component which actuates the optical component in a smaller range to focus the beam on the target data position. The cross-layer displacement component and the intra-layer focusing component may each include more than one actuator. In some embodiments, the focusing component also actuates the optical component in a tilting motion to compensate for movement or imperfections of the disk during a reading or recording process.
    • 提供了使用多级致动器致动光学头的一个或多个光学部件的技术。 多级致动器包括跨层位移部件,其驱动光学部件以在与全息光盘中的数据层的厚度相对应的位移范围内改变光束聚焦,使得光束撞击在目标数据层上 。 多级致动器还包括内部聚焦部件,该部件在较小范围内致动光学部件,以将光束聚焦在目标数据位置上。 跨层位移分量和层内聚焦分量可以各自包括多于一个的致动器。 在一些实施例中,聚焦部件还以倾斜运动来致动光学部件,以在读取或记录过程期间补偿光盘的运动或不完美。