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    • 124. 发明授权
    • Optical pickup apparatus for phase changing optical disk
    • 用于相变光盘的光学拾取装置
    • US5450387A
    • 1995-09-12
    • US957600
    • 1992-10-06
    • Masumi OnoAtsushi FukumotoKouichi Yasuda
    • Masumi OnoAtsushi FukumotoKouichi Yasuda
    • G11B7/00G11B7/0045G11B7/005G11B7/09G11B7/095G11B7/135G11B11/105
    • G11B11/10576G11B7/00454G11B7/0052G11B7/0903
    • An optical disk reproducing apparatus for optical disks which are have a material layer whose reflectivity is lowered when a temperature of this material exceeds a predetermined temperature, is fabricated on a transparent substrate. A plurality of phase pits have been formed in this substrate corresponding to an information signal. The optical disk reproducing apparatus comprises: an optical pickup for reading the information signal by irradiating on a recording plane of the optical disk, a first optical spot for reproducing the information signal, and also second and third optical spots each having lower light intensity than that of the first optical spot. The second and third optical spots located at positions where there is no adverse influence caused by a thermal history of the first optical spot. The optical disk reproducing apparatus further comprises tracking control unit for performing a tracking control of the optical pickup based upon a difference signal between detection signals derived from first and second photo detecting units of the optical pickup, for receiving light of the second and third optical spots reflected from the optical disk.
    • 一种用于光盘的光盘再现装置,在该材料的温度超过预定温度时,具有反射率降低的材料层。 在该基板上形成了与信息​​信号对应的多个相位凹坑。 光盘重放装置包括:光拾取器,用于通过照射在光盘的记录平面上的信息信号,用于再现信息信号的第一光点,以及具有比光强低的光强度的第二和第三光点。 的第一个光点。 位于第一光点的热历史没有不利影响的位置处的第二和第三光点。 光盘重放装置还包括跟踪控制单元,用于基于从光学拾取器的第一和第二光电检测单元得到的检测信号之间的差异信号执行光学拾取器的跟踪控制,用于接收第二和第三光点的光 从光盘反射。
    • 125. 发明授权
    • Optical recording medium
    • 光记录介质
    • US5432774A
    • 1995-07-11
    • US930701
    • 1992-10-06
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • G11B7/005G11B11/105G11B7/09
    • G11B7/005G11B11/10504G11B11/10515G11B11/10528G11B11/10586
    • An optical recording medium has a multi-layer film including a reproducing layer and a recording holding layer magnetically coupled to each other as a recording film. While a readout light is radiated to the optical recording medium for erasing the recording holding layer and the reproducing layer or transcribing signals magnetically recorded in the recording holding layer to the reproducing layer, the signals are converted by photomagnetic effects into optical signals which are read, or an optical recording medium having phase pits changed in reflectance with temperature. While a readout light beam is radiated to the optical recording medium and the reflectance is changed partially within a scanning spot of the readout light beam, the phase pits are read. The minimum pit interval of the recording signals along the scanning direction of the readout light beam is selected to be not more than .lambda./2NA, where .lambda. is the wavelength of the readout light beam, and NA is the numerical aperture of an objective lens for raising the recording line density and the recording capacity of the recording medium.
    • PCT No.PCT / JP91 / 01435 Sec。 371日期:1992年10月6日 102(e)日期1992年10月6日PCT 1991年10月18日PCT PCT。 出版物WO92 / 15091 日期:1992年9月3日。光记录介质具有包括作为记录膜彼此磁耦合的再现层和记录保持层的多层膜。 当读出光被照射到用于擦除记录保持层和再现层的光学记录介质或将磁记录在记录保持层中的信号转录到再现层时,信号通过光磁效应被转换成被读取的光信号, 或具有随温度变化的相位凹坑的光记录介质。 当读出光束被照射到光学记录介质并且反射率在读出光束的扫描点内部分地改变时,读取相位凹坑。 沿着读出光束的扫描方向的记录信号的最小凹坑间隔被选择为不大于λ/ 2NA,其中λ是读出光束的波长,NA是物镜的数值孔径,用于 提高记录线密度和记录介质的记录容量。
    • 126. 发明授权
    • Method for reproducing signals recorded on optical recording medium
    • 用于再现记录在光学记录介质上的信号的方法
    • US5390162A
    • 1995-02-14
    • US941058
    • 1992-09-30
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • G11B7/005G11B11/105G11B19/02G11B11/10G11B11/03
    • G11B7/005G11B11/10515G11B11/10595G11B19/02
    • A method for reproducing a magneto-optical recording medium the recording pits of which are erased or relieved with rise in temperature of the recording medium caused by radiation of a readout light beam or an optical recording medium the reflectance of which is changed with rise in temperature of the recording medium caused by radiation of the readout light beam, in which changes in the size of an effective reproducing region due to the temperature of the recording medium may be inhibited. To this end, when the magneto-optical disc 11, for example, is rotated at a constant angular velocity, a detecting unit 17 is provided for detecting the radial position of the magneto-optical disc 11 and the laser power as well as the external magnetic field is controlled depending on an output of the detecting unit 17 for controlling the size of an effective reproducing region to be constant without regard to the linear velocity at each reproducing position.
    • PCT No.PCT / JP91 / 01438 Sec。 371日期:1992年9月30日 102(e)日期1992年9月30日PCT 1991年10月19日PCT公布。 出版物WO92 / 14245 日期:1992年8月20日。一种用于再现磁光记录介质的方法,所述磁光记录介质由于读出光束或光记录介质的辐射而被记录介质的温度升高而被擦除或释放, 其随着读取光束的辐射而导致的记录介质的温度升高而改变,其中由于记录介质的温度导致的有效再现区域的尺寸的变化可能被抑制。 为此,例如当磁光盘11以恒定的角速度旋转时,提供检测单元17用于检测磁光盘11的径向位置和激光功率以及外部 根据检测单元17的输出控制磁场,用于将有效再现区域的大小控制为恒定,而不考虑每个再现位置处的线速度。
    • 129. 发明授权
    • Positional detection of a magneto-optic recording medium for controlling
irradiation of a relief region
    • 用于控制浮雕区域照射的磁光记录介质的位置检测
    • US5335213A
    • 1994-08-02
    • US937876
    • 1992-09-30
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • Atsushi FukumotoToshiki UdagawaShunji YoshimuraMasumi OnoKouichi Yasuda
    • G11B7/005G11B11/105G11B11/00G11B11/10
    • G11B11/10595G11B11/10515G11B7/005
    • A method for reproducing a magneto-optical recording medium the recording pits of which are erased or relieved with rise in temperature of the recording medium caused by radiation of a readout beam, or an optical recording medium the reflectance of which is changed with rise in temperature of the recording medium caused by radiation of the readout beam, in which, when the line recording density of the recording medium is changed, the size of the effective reproducing region is controlled to an optimum value conforming to the line recording density to assure a stable reproducing state. To this end, with the magneto-optical disc 11 for example, being rotated at a constant angular velocity, a detecting unit 17 is provided for detecting the radial position of the magneto-optical disc 11 and the laser power as well as the external magnetic field is controlled depending on an output of the detecting unit 17 for controlling the size of an effective reproducing region to an optimum value conforming to the line recording density at each reproducing position.
    • PCT No.PCT / JP91 / 01439 Sec。 371日期:1992年9月30日 102(e)日期1992年9月30日PCT 1991年10月19日PCT公布。 公开号WO92 / 15093 日期:1992年9月3日。一种用于再现磁光记录介质的方法,所述磁光记录介质的记录凹坑由于读出光束的辐射而导致的记录介质的温度升高或释放,或光记录介质的反射率 其随着读出光束的辐射而由记录介质的温度升高而改变,其中当记录介质的行记录密度改变时,有效再现区域的大小被控制为符合 线路记录密度以确保稳定的再现状态。 为此,例如利用磁光盘11以恒定的角速度旋转,提供检测单元17用于检测磁光盘11的径向位置和激光功率以及外部磁性 根据检测单元17的输出控制有效再现区域的大小,使其达到在每个再现位置处符合行记录密度的最佳值。