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61. 发明授权

US5367509A Method for reproducing information recorded on a magneto-optical recording medium including servo controlling the dimension of the reproduction region of the recording medium by means of a recorded signal 失效
标题翻译：用于再现记录在磁光记录介质上的信息的方法，包括通过记录信号控制记录介质的再现区域的尺寸的伺服
公开(公告)号：US5367509A
公开(公告)日：1994-11-22
申请号：US233555
申请日：1994-04-26
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
IPC分类号： G11B7/125 , G11B11/10 , G11B11/105 , G11B13/04 , G11B11/12
CPC分类号： G11B11/10515 , G11B11/10595
摘要： This invention is directed to an improvement in a novel magneto-optical disc reproducing method of the record information erasing type or the record information raised or transfer type wherein a technique is employed to prevent the dimension of an actual reproduction region from varying by a change of temperature or linear velocity of a magneto-optical disc. To realize this, reference information is recorded on a magneto-optical disc to reproduce this reference information prior to actual data reproduction to detect the regenerative RF signal level to control a laser power or an external magnetic field so that the regenerative RF signal level becomes equal to a level optimum for reproduction, thus allowing the dimension of an actual reproduction region to be an optimum fixed dimension at all times. At the time of actual reproduction, control is made so that the controlled laser power or external magnetic field is maintained.
摘要翻译：本发明旨在改进记录信息擦除类型或记录信息提升或传输类型的新型磁光盘再现方法，其中采用一种技术来防止实际再现区域的尺寸由于磁光盘的温度或线速度。为了实现这一点，将参考信息记录在磁光盘上以在实际数据再现之前再现该参考信息，以检测再生RF信号电平以控制激光功率或外部磁场，使得再生RF信号电平变得相等达到最佳的再现水平，从而允许实际再现区域的尺寸始终为最佳固定尺寸。在实际再现时，进行控制以保持受控激光功率或外部磁场。

62. 发明授权

US5335213A Positional detection of a magneto-optic recording medium for controlling irradiation of a relief region 失效
标题翻译：用于控制浮雕区域照射的磁光记录介质的位置检测
公开(公告)号：US5335213A
公开(公告)日：1994-08-02
申请号：US937876
申请日：1992-09-30
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
IPC分类号： G11B7/005 , G11B11/105 , G11B11/00 , G11B11/10
CPC分类号： G11B11/10595 , G11B11/10515 , G11B7/005
摘要： 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.
摘要翻译： 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。

63. 发明授权

US5208799A Magneto-optic recording method and magneto-optic recording/reproducing apparatus 失效
标题翻译：磁光记录方法和磁光记录/再现装置
公开(公告)号：US5208799A
公开(公告)日：1993-05-04
申请号：US832384
申请日：1992-02-07
申请人： Isamu Nakao , Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
发明人： Isamu Nakao , Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10502 , G11B11/10532 , G11B11/10586
摘要： A method and apparatus for recording and reproducing information onto and from a magneto-optic recording medium is disclosed. The magneto-optic recording medium has at least a reproducing layer and a recording layer. A recording optical head records information on the magneto-optic recording medium. A reproducing optical head has a reading light beam for reading information recorded in a region within a spot of the reading light beam by magneto-optic effect by changing a state of magnetization of the reproducing layer and at the same time irradiating the recording medium with the light beam. A wavelength of the recording light beam emitted by the recording optical head is substantially smaller than a wavelength of the reading light beam emitted by the reading optical head. A minimum ratio of the wavelength of the recording light beam to that of the reproducing light beam is 1:3.

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