发明授权
US5420837A Recording condition determination method and apparatus upon execution of over-write operation on magnetooptical disk by heat shut off method and pulse train method, and magnetooptical recording method and apparatus 失效
通过热切断方法和脉冲串方法对磁光盘执行过写操作的记录条件确定方法和装置以及磁光记录方法和装置

  • 专利标题: Recording condition determination method and apparatus upon execution of over-write operation on magnetooptical disk by heat shut off method and pulse train method, and magnetooptical recording method and apparatus
  • 专利标题(中): 通过热切断方法和脉冲串方法对磁光盘执行过写操作的记录条件确定方法和装置以及磁光记录方法和装置
  • 申请号: US141620
    申请日: 1993-10-27
  • 公开(公告)号: US5420837A
    公开(公告)日: 1995-05-30
  • 发明人: Jun SaitoShinichi Kurita
  • 申请人: Jun SaitoShinichi Kurita
  • 申请人地址: JPX Tokyo
  • 专利权人: Nikon Corporation
  • 当前专利权人: Nikon Corporation
  • 当前专利权人地址: JPX Tokyo
  • 优先权: JPX4-289165 19921028; JPX5-255416 19931013
  • 主分类号: G11B7/0045
  • IPC分类号: G11B7/0045 G11B7/125 G11B11/105 G11B11/00
Recording condition determination method and apparatus upon execution of
over-write operation on magnetooptical disk by heat shut off method and
pulse train method, and magnetooptical recording method and apparatus
摘要:
In a magnetooptical recording method and apparatus the intensity of a laser beam to be radiated onto an over-write capable magnetooptical disk is raised from P.sub.L to an intensity P.sub.H higher than P.sub.L, the intensity is reduced to an intensity P.sub.LT lower than P.sub.H after P.sub.H is maintained for a time T.sub.W1, the laser beam is intensity-modulated at a period T.sub.p between P.sub.LT and an intensity P.sub.W2 higher than P.sub.LT so as to form a mark on the magnetooptical disk by a high-temperature cycle, thereafter, the intensity is reduced to an intensity P.sub.LB lower than P.sub.L, and the intensity is raised to P.sub.L after an elapse of a time T.sub.off. The intensity P.sub.L is selected from an intensity range defined between an upper limit and a lower limit. The upper limit is a laser beam intensity for maintaining a pre-heat state in which a temperature on the magnetooptical disk becomes a predetermined temperature .THETA..sub.pre, and is also an intensity which does not cause the high-temperature cycle. The lower limit is an intensity at which a mark formed by the high-temperature cycle can be erased. At least one of P.sub.L, T.sub.off, and P.sub.LB is controlled to achieve the pre-heat state within a time until the intensity is raised to P.sub.H again. At least one of P.sub.W2, P.sub.LT, and a time T.sub.W2 for maintaining P.sub.W2 is controlled, so that a temperature, after an elapse of T.sub.W1, at a peak temperature position or a spot center position of the laser beam radiated onto the magnetooptical disk surface becomes equal to a temperature after an elapse of T.sub.W2.
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