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    Optical recording medium having a constant birefringent property and an alterable photochromic property
    1.
    发明授权
    Optical recording medium having a constant birefringent property and an alterable photochromic property 失效
    具有恒定双折射性和可变光致变色特性的光记录介质

    公开(公告)号：US5316900A

    公开(公告)日：1994-05-31

    申请号：US138246

    申请日：1993-10-15

    申请人： Tsuyoshi Tsujioka ,  Fumio Tatezono ,  Koutaro Matsuura ,  Masahiro Irie

    发明人： Tsuyoshi Tsujioka ,  Fumio Tatezono ,  Koutaro Matsuura ,  Masahiro Irie

    IPC分类号： G11B7/24 ,  G03C1/73

    CPC分类号： G11B7/24 ,  Y10S430/146

    摘要： A recording medium comprises a recording layer, a birefringent layer, and a reflecting layer. The recording layer is formed of a material whose optical rotatory power is alterable such that in one state no optical rotatory power is present and, in a second state, optical rotatory power is present. Information is recorded in the recording layer by selectively altering the state of the recording layer. The birefringent layer is formed of a material having constant birefringence without regard to the state of the recording layer. The reflecting layer reflects a light beam transmitted through the recording layer and the birefringent layer to reintroduce the beam into the birefringent layer and the recording layer. A method of reproducing information from this recording medium applies a polarized light beam to the recording medium and detects change of the polarized state of the polarized light beam reflected from the recording medium, thereby reading the information recorded in the recording layer. According to the inventive recording medium and reproducing method, the information is reproduced by detecting the presence of optical rotatory power of the recording layer.

    摘要翻译： 记录介质包括记录层，双折射层和反射层。 记录层由其旋光力可变的材料形成，使得在一个状态下不存在旋转光，而在第二状态下存在旋转光。 通过选择性地改变记录层的状态将信息记录在记录层中。 双折射层由具有恒定双折射的材料形成，而不考虑记录层的状态。 反射层反射透射通过记录层和双折射层的光束，以将光束重新引入双折射层和记录层。 从该记录介质再现信息的方法将偏振光束施加到记录介质上并检测从记录介质反射的偏振光束的偏振状态的变化，从而读取记录在记录层中的信息。 根据本发明的记录介质和再现方法，通过检测记录层的旋转光的存在来再现信息。