发明授权
US06650599B2 Method and apparatus for determining power level of laser beam in magneto-optical recording device
有权
用于确定磁光记录装置中的激光束功率电平的方法和装置
- 专利标题: Method and apparatus for determining power level of laser beam in magneto-optical recording device
- 专利标题(中): 用于确定磁光记录装置中的激光束功率电平的方法和装置
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申请号: US09922836申请日: 2001-08-07
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公开(公告)号: US06650599B2公开(公告)日: 2003-11-18
- 发明人: Naoyuki Takagi , Atsushi Yamaguchi , Kenichiro Mitani
- 申请人: Naoyuki Takagi , Atsushi Yamaguchi , Kenichiro Mitani
- 优先权: JP10-011341 19980123; JP10-323842 19981113
- 主分类号: G11B1100
- IPC分类号: G11B1100
摘要:
A reproducing apparatus reproduces a signal recorded in a magneto-optical disk. The magneto-optical disk includes a layered structure having a recording layer, an intermediate layer and a reproducing layer. Laser light is illuminated from an optical head to the magneto-optical disk in such an intensity that no magnetic domain is transferred from the recording layer to the reproducing layer only by the laser light. In this state, alternating magnetic field is applied through a magnetic head to the magneto-optical disk, thereby concurrently causing transfer and expansion of a magnetic domain to the reproducing layer. As a result, transfer of the magnetic domain is effected with expansion.