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    • 5. 发明授权
    • Short coherent-length optical tomograph for high density volume optical
data storage devices
    • 用于高密度体积光学数据存储设备的短相干长度光学层析成像仪
    • US5883875A
    • 1999-03-16
    • US921710
    • 1997-09-02
    • Hans Juergen CoufalRobert K. Grygier
    • Hans Juergen CoufalRobert K. Grygier
    • G11B7/00G11B7/0037G11B7/005G11B7/09G11B7/12G11B7/125G11B7/135G11B7/14
    • G11B7/0065G11B7/005G11B7/12G11B7/128G11B7/1369G11B7/14G01N21/4795G01N21/9501G11B2007/0013G11B7/0037G11B7/08564G11B7/0908
    • A device for reading data from a multi-layered optical disk includes a short coherence-length light source, a beam splitter, an adjustable mirror and an optical detector. The beam splitter is used to form first and second light beams from the short coherence-length light beam. The first light beam is then directed to the optical disk and is reflected by a data mark stored on the optical disk. The second light beam is directed along a reference beam path. The mirror is disposed along the reference beam path and reflects the second light beam back to the beam splitter. The beam splitter recombines the reflected first light beam and the second light beam after the second light beam traverses the reference beam path. The optical detector detects the data mark by constructive interference of the combined reflected first light beam and the second light beam. The position of the mirror is adjustable so that the optical path length of the reference beam path is made equal to the optical path length of the first light beam to each layer of the multi-layered optical disk. A device for recording data onto a multi-layered optical disk uses similar components and techniques for recording data.
    • 用于从多层光盘读取数据的装置包括短相干长度光源,分束器,可调镜和光检测器。 分束器用于从短相干长度光束形成第一和第二光束。 第一光束然后被引导到光盘,并被存储在光盘上的数据标记反射。 第二光束沿着参考光束路径被引导。 反射镜沿着参考光束路径设置并将第二光束反射回分束器。 在第二光束穿过参考光束路径之后,分束器将反射的第一光束和第二光束重新组合。 光检测器通过组合的反射第一光束和第二光束的相长干涉来检测数据标记。 反射镜的位置是可调节的,使得参考光束路径的光路长度等于第一光束到多层光盘的每一层的光路长度。 用于将数据记录到多层光盘上的装置使用类似的组件和技术来记录数据。