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1. 发明公开

EP0803870A3 Magneto-optical recording medium 失效
标题翻译： Magnetooptisches Aufzeichnungsmedium
公开(公告)号：EP0803870A3
公开(公告)日：1998-08-12
申请号：EP97106555
申请日：1997-04-21
申请人： SHARP KK
发明人： HIROKANE JUNJI , NAKAYAMA JUNICHIRO , NAKAJIMA JUNSAKU , TAKAHASHI AKIRA
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10586 , Y10S428/90
摘要： An magneto-optical recording medium includes: a transparent dielectric layer (2); a reproduction layer (3) that is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature; a non-magnetic intermediate layer (4); a recording layer (5) made of a perpendicularly magnetized film; and a protection layer (6), the layers being formed one after another in this order. The recording layer is made of a rare-earth and transition metal alloy, and the rare earth metal is composed of more than two kinds of rare-earth-metal elements containing Gd. The information stored in a magnetic recording domain is masked with respect to a part that is in an in-plane magnetization state. Consequently, recording can be performed with a less powerful laser beam, and each recording bit can be reproduced independently to produce high quality signals even if the converged light beam covers a neighboring recording bit within its radius.
摘要翻译：一种磁光记录介质包括：透明介电层（2）; 再现层（3），其在室温下处于平面内磁化状态并随着温度升高而变为垂直磁化状态; 非磁性中间层（4）; 由垂直磁化膜制成的记录层（5）和保护层（6），各层依次形成。记录层由稀土过渡金属合金构成，稀土类金属由含有Gd的两种以上的稀土类金属元素构成。存储在磁记录域中的信息相对于处于面内磁化状态的部分被掩蔽。因此，即使聚焦光束覆盖其半径内的相邻记录位，也可以用较小功率的激光束执行记录，并且可以独立地再现每个记录位以产生高质量信号。

2. 发明公开

EP0782135A3 Magneto-optical recording medium and method for reproducing therefrom 失效
标题翻译： Magnetooptisches Aufzeichnungsmedium und Verfahren zur Wiedergabe davon
公开(公告)号：EP0782135A3
公开(公告)日：1998-07-08
申请号：EP96309394
申请日：1996-12-20
申请人： SHARP KK
发明人： HIROKANE JUNJI , NAKAYAMA JUNICHIRO , NAKAJIMA JUNSAKU , TAKAHASHI AKIRA , OHTA KENJI
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10515 , G11B11/10584 , G11B11/10589 , G11B11/10593
摘要： A magneto-optical recording medium is arranged so that (1) a first transparent dielectric layer, (2) a reproduction layer showing in-plane magnetization at room temperature while showing perpendicular magnetization in response to temperature rise, (3) a second transparent dielectric layer, (4) a recording layer made of perpendicular magnetization film; and (5) a protective layer are laminated on a substrate in this order. The reproduction layer has a thickness of 5nm to 30nm, the second transparent dielectric layer has a thickness of 6nm to 40nm, and the recording layer has a thickness of 20nm to 80nm. It is possible to separately reproduce individual recording bit even when one or more adjacent recording bits exist within the diameter of the light beam converged onto a target recording bit. This is because the information of a recording magnetic domain of a portion showing in-plane magnetization is masked.
摘要翻译：磁光记录介质被布置成使得（1）第一透明介电层，（2）再现层，其在室温下显示面内磁化同时响应于温度升高而显示垂直磁化，（3）第二透明电介质层，（4）由垂直磁化膜制成的记录层; 和（5）保护层依次层压在基板上。再生层的厚度为5nm〜30nm，第二透明介电层的厚度为6nm〜40nm，记录层的厚度为20nm〜80nm。即使在收敛到目标记录位上的光束的直径内存在一个或多个相邻的记录位，也可以分别再现各个记录位。这是因为屏蔽显示面内磁化的部分的记录磁畴的信息。

3. 发明授权

EP0471527B1 Method and system for reproducing information from a magnetic recording medium 失效
标题翻译：方法和系统，用于再现磁记录介质上的信息
公开(公告)号：EP0471527B1
公开(公告)日：1997-12-29
申请号：EP91307371
申请日：1991-08-09
申请人： SHARP KK
发明人： NAKAJIMA JUNSAKU , TAKAHASHI AKIRA , HIROKANE JUNJI , MURAKAMI YOSHITERU , OHTA KENJI
IPC分类号： G03G5/16 , G11B5/00 , G11B5/64 , G11B11/105 , G11B13/04 , G11B19/02 , G11B11/10
CPC分类号： G11B5/653 , G03G5/16 , G11B5/00 , G11B5/656 , G11B11/10504 , G11B11/10515 , G11B11/10532 , G11B11/10589 , G11B13/045 , G11B19/02

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