发明授权
US5783300A Magnetooptical recording medium allowing overwriting with two or more
magnetic layers and recording method utilizing the same
失效
允许使用两个或多个磁性层重写的磁光记录介质和利用该磁光记录介质的记录方法
- 专利标题： Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same
- 专利标题（中）： 允许使用两个或多个磁性层重写的磁光记录介质和利用该磁光记录介质的记录方法
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申请号： US613431申请日： 1996-02-29
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公开(公告)号： US5783300A公开(公告)日： 1998-07-21
- 发明人: Yoichi Osato , Hisaaki Kawade , Eiichi Fujii , Nobuhiro Kasama , Tadashi Kobayashi
- 申请人： Yoichi Osato , Hisaaki Kawade , Eiichi Fujii , Nobuhiro Kasama , Tadashi Kobayashi
- 申请人地址： JPX Tokyo
- 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 Tokyo
- 优先权： JPX62-153108 19860618; JPX61-158787 19860708; JPX61-191202 19860816; JPX61-262034 19861105; JPX61-278566 19861125; JPX61-278567 19861125; JPX61-20384 19870202; JPX61-21675 19870203; JPX62-23993 19870204; JPX62-24706 19870206; JPX62-24707 19870206; JPX62-27082 19870210; JPX62-27083 19870210; JPX62-37736 19870223; JPX62-52897 19870310; JPX62-70273 19870326; JPX62-70274 19870326; JPX62-70279 19870326; JPX62-72559 19870326
- 主分类号： G11B11/105
- IPC分类号： G11B11/105 ; G11B5/66 ; G11B5/62 ; G11B5/64 ; G11B11/00
摘要：
A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than the first magnetic layer and being exchange coupled with the first magnetic layer satisfies the relation: ##EQU1## wherein H.sub.H is the coercive force of the first magnetic layer; H.sub.L is the coercive force of the second magnetic layer; M.sub.s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and .sigma..sub.w is the magnetic wall energy between the first and second magnetic layers.
公开/授权文献
- USD243262S Game target 公开/授权日：1977-02-01