发明授权
US5889739A Magnetooptical recording medium and information recording and reproducing methods using the recording medium 失效
磁光记录介质和使用记录介质的信息记录和再现方法

  • 专利标题: Magnetooptical recording medium and information recording and reproducing methods using the recording medium
  • 专利标题(中): 磁光记录介质和使用记录介质的信息记录和再现方法
  • 申请号: US774721
    申请日: 1997-01-03
  • 公开(公告)号: US5889739A
    公开(公告)日: 1999-03-30
  • 发明人: Naoki NishimuraHiroshi OmataKazuoki Honguu
  • 申请人: Naoki NishimuraHiroshi OmataKazuoki Honguu
  • 申请人地址: JPX
  • 专利权人: Canon Kabushiki Kaisha
  • 当前专利权人: Canon Kabushiki Kaisha
  • 当前专利权人地址: JPX
  • 优先权: JPX4-230265 19920828; JPX4-230266 19920828; JPX4-230277 19920828; JPX5-038137 19930226; JPX5-038138 19930226; JPX5-043786 19930304; JPX5-066656 19930325; JPX5-098025 19930423; JPX5-188400 19930729; JPX5-188438 19930729
  • 主分类号: G11B11/10
  • IPC分类号: G11B11/10 G11B11/105 G11B5/66
Magnetooptical recording medium and information recording and
reproducing methods using the recording medium
摘要:
A method of recording information on and reproducing information from a magnetooptical recording medium which includes first and second magnetic layers. The method includes the step of projecting a light spot onto the medium. When reproducing information, the light spot is projected onto the medium from the side of the magnetic layer. In this method only a high temperature region of the second magnetic layer within a light spot projection portion is changed to a perpendicular magnetization film so that information recorded in the first magnetic layer is transferred to the perpendicular magnetization film of the second magnetic layer. In addition, information which is transferred to the second magnetic layer is detected by using reflected light from the medium which is subjected to the magneto-optic effect from the perpendicular magnetization film of the second magnetic layer. When recording information, a magnetic field is applied, whose magnetization direction is modulated according to information, to a light spot projection portion of the medium so the magnetization of the second magnetic layer is oriented to the direction of the applied magnetic field, and the magnetization of the second magnetic layer is transferred to the first magnetic layer to form a record bit.
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