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1. 发明申请

WO1993023850A1 READ-ONLY OPTOMAGNETIC DISK, AND REPRODUCING METHOD AND EQUIPMENT 审中-公开
标题翻译：只读光盘，再生方法和设备
公开(公告)号：WO1993023850A1
公开(公告)日：1993-11-25
申请号：PCT/JP1993000647
申请日：1993-05-18
申请人： NIKON CORPORATION , MATSUMOTO, Hiroyuki , NIWA, Tatsuo
发明人： NIKON CORPORATION
IPC分类号： G11B11/10
CPC分类号： G11B11/10586 , G11B11/10515 , G11B11/10584 , G11B11/10593
摘要： A read-only optomagnetic disk which comprises at least a supporting base and a magnetic layer formed on it, and is provided with a first group of regions ( alpha 1) (corresponding to pits or marks) which are magnetizable in given directions by the irradiation with a laser beam for reproduction, and a second group of regions ( alpha 0) which are not magnetizable in given directions. One region of the first or second groups is handled as an information unit. The presence of this information unit, the length, or the edge position, represents information. Only when a region ( alpha 1) is positioned in the heat accumulated area (a) in the irradiated spot, the coercive force in it is reduced. Therefore, the magnetization is orientated in a given direction ANd by the influence of an auxiliary magnetic field ANd (heated out). In any other area than the ( alpha 1) in the spot, the magnetism is not orientated in the direction ( ANd ). Even if a region ( alpha 0) is in the heat accumulated area (a), magnetism in the whole spot is not in the given directions. Therefore, it is possible to detect the region ( alpha 1) which is smaller than the diameter of the spot.
摘要翻译：一种只读光磁盘，其至少包括支撑基座和形成在其上的磁性层，并且具有第一组区域（α1）（对应于凹坑或标记）），其可通过照射在给定方向上可磁化具有用于再现的激光束，以及在给定方向上不可磁化的第二组区域（α0）。处理第一组或第二组的一个区域作为信息单元。该信息单元的存在，长度或边缘位置表示信息。只有当区域（α1）位于照射点的热积聚区域（a）中时，其中的矫顽力降低。因此，通过辅助磁场ANd（被加热）的影响，磁化在给定方向ANd上定向。在任何其他区域（α1）中，磁场不是沿着方向（ANd）定向的。即使区域（α0）在热积累区域（a）中，整个点的磁性也不在给定的方向上。因此，可以检测小于点的直径的区域（α1）。

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