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    Optical information recording and reproducing disc employing a film having thermally changeable optical characteristics
    1.
    发明授权
    Optical information recording and reproducing disc employing a film having thermally changeable optical characteristics 失效
    使用具有热变化光学特性的膜的光学信息记录和再现盘

    公开(公告)号：US4852076A

    公开(公告)日：1989-07-25

    申请号：US062425

    申请日：1987-06-16

    申请人： Takeo Ohta ,  Tatsushi Nakamura ,  Shizuhiko Tanigawa

    发明人： Takeo Ohta ,  Tatsushi Nakamura ,  Shizuhiko Tanigawa

    IPC分类号： G11B7/013 ,  G11B7/24 ,  G11B7/24085 ,  G11B27/32

    CPC分类号： G11B7/24085 ,  G11B27/32 ,  G11B7/24

    摘要： An optical information recording and reproducing disc information has a substrate in the surface of which are formed signal recording grooves and cue signal recording pits. A light-absorbing thin film is formed on the surface of the substrate, the optical characteristics of the light-absorbing film being changeable thermally through irradiation by a light beam. The pitches of the grooves and pits, as well as the widths of the grooves and pits, are determined to meet specific conditions in relation to the diameter of the laser beam which is used for recording and reproduction of the signals. In addition, the depths of the grooves and pits are determined suitably in relation to the wavelength of the laser beam. With this arrangement, it is possible to attain a high quality of reproduction of information from the disc.

    摘要翻译： 光信息记录和再现盘信息具有表面上的基板，形成信号记录槽和提示信号记录凹坑。 在基板的表面上形成光吸收薄膜，光吸收膜的光学特性可通过光束的照射热变化。 凹槽和凹坑的间距以及凹槽和凹坑的宽度被确定为满足用于记录和再现信号的激光束的直径的特定条件。 此外，相对于激光束的波长适当地确定凹槽和凹坑的深度。 通过这种布置，可以从盘获得高质量的信息再现。

    Optical recording and retrieving disc
    2.
    发明授权
    Optical recording and retrieving disc 失效
    光学记录和回收光盘

    公开(公告)号：US4547875A

    公开(公告)日：1985-10-15

    申请号：US433264

    申请日：1982-10-07

    申请人： Takeo Ohta ,  Tatsushi Nakamura ,  Nobuo Akahira

    发明人： Takeo Ohta ,  Tatsushi Nakamura ,  Nobuo Akahira

    IPC分类号： G11B7/013 ,  G11B7/09 ,  G11B7/24 ,  G11B7/243 ,  G11B7/00

    CPC分类号： G11B7/24085 ,  G11B7/0901 ,  G11B7/24

    摘要： An optical disc for optical recording, retrieving and erasing of informations. The phase difference .psi. of reflected light produced by the tracking groove in the form of convexity or protrusion of concavity or groove and the change .DELTA..psi. in the phase difference caused by a recording in a recording film are selected in relation to each other to provide a stable detection signal for tracking, thereby to permit a highly accurate tracking on the optical disc carrying information at a high density.

    摘要翻译： 用于光学记录，检索和擦除信息的光盘。 选择相对于彼此相对于由记录膜中的记录引起的由凹槽或凹槽的凸起或突出形式的跟踪凹槽产生的反射光的相位差psi和由记录膜中的记录引起的相位差的变化ΔTApsi， 用于跟踪的稳定的检测信号，从而允许高密度地携带信息的光盘上的高精度跟踪。

    System and method of optical information storage in a recording disc
    3.
    发明授权
    System and method of optical information storage in a recording disc 失效
    光信息存储在记录盘中的系统和方法

    公开(公告)号：US4330883A

    公开(公告)日：1982-05-18

    申请号：US76725

    申请日：1979-09-18

    申请人： Takeo Ohta ,  Nobuo Akahira ,  Tatsushi Nakamura ,  Tadaoki Yamashita

    发明人： Takeo Ohta ,  Nobuo Akahira ,  Tatsushi Nakamura ,  Tadaoki Yamashita

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/24

    CPC分类号： G11B7/24 ,  G11B7/00455

    摘要： A system and a method of recording information by changes of refractive index and light absorption coefficient on a thin film, and reproducing the recorded information byscanning a focussed monochromatic light along a track on a thin film of a selected thickness andletting a light component reflected at a light-incident surface of said thin film and the other light component reflected at an inside face of the opposite surface to said incident surface of the thin film interfere with each other thereby efficiently to vary intensity of reflection light.

    摘要翻译： 一种通过薄膜上的折射率和光吸收系数的变化来记录信息的系统和方法，并且通过沿着所选厚度的薄膜上的轨道扫描聚焦的单色光并且使反射的光成分再现所记录的信息 在所述薄膜的光入射表面处，并且在与薄膜的入射表面相对的表面的内表面处反射的另一个光分量彼此干涉，从而有效地改变反射光的强度。

    Method and apparatus for recording and reproducing information on and from an optical disk
    4.
    发明授权
    Method and apparatus for recording and reproducing information on and from an optical disk 失效
    用于在光盘上记录和再现信息的方法和装置

    公开(公告)号：US4322839A

    公开(公告)日：1982-03-30

    申请号：US069570

    申请日：1979-08-24

    申请人： Tadaoki Yamashita ,  Takeo Ohta ,  Nobuo Akahira ,  Tatsushi Nakamura ,  Mutsuo Takenaga

    发明人： Tadaoki Yamashita ,  Takeo Ohta ,  Nobuo Akahira ,  Tatsushi Nakamura ,  Mutsuo Takenaga

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/24

    CPC分类号： G11B7/00455 ,  G11B7/24

    摘要： The optical density and/or the reflectivity of a recording layer included in an optical disk is selectively changed to record information by irradiation with a semiconductor laser beam, while the recording layer may be covered with a suitable protective film. The thickness of the recording layer is so determined that it is able to record information by means of a continuous wave type semiconductor laser beam, while the optical absorption rate of the recording layer is adjusted by setting the percentages of particular additives. The recorded information may be reproduced by the application of a laser beam, the incident power of which is lower than that of the recording beam, to detect the reflected light.

    摘要翻译： 选择性地改变包括在光盘中的记录层的光密度和/或反射率以通过用半导体激光束照射来记录信息，同时可以用合适的保护膜覆盖记录层。 记录层的厚度被确定为能够通过连续波型半导体激光束记录信息，同时通过设定特定添加剂的百分比来调节记录层的光吸收率。 记录的信息可以通过施加其入射功率低于记录光束的激光束来再现以检测反射光。