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    • 1. 发明授权
    • Thermomagnetic recording method using a recording light power modulated
according to the signal to be modulated
    • 使用根据要调制的信号调制的记录光功率的热磁记录方法
    • US5379275A
    • 1995-01-03
    • US131854
    • 1993-10-05
    • Masahiko KanekoKatsuhisa ArataniYoshihiro Muto
    • Masahiko KanekoKatsuhisa ArataniYoshihiro Muto
    • G11B11/105G11B13/04
    • G11B11/10586G11B11/10506G11B11/10519G11B11/10521G11B11/10523G11B11/10528
    • The present invention adopts as the basic structure of its thermomagnetic recording medium an arrangement consisting of a first and a second magnetic thin film having perpendicular anisotropy and a third magnetic thin film having in-plane magnetic anisotropy or small perpendicular magnetic anisotropy interposed therebetween, formed into a laminated structure by being magnetically coupled to the adjoining films in turn, modulates and switches, in accordance with information to be recorded, a first heating condition and a second heating condition, with the medium applied with a predetermined external magnetic field H.sub.ex in the direction perpendicular to the plane of the film, the first condition being that for raising temperature of the medium to a first temperature T.sub.1 which is virtually above the Curie temperature T.sub.C1 of the first magnetic thin film and not causing reversal of the magnetic moment in the second magnetic thin film and the second condition being that for raising temperature of the same to a second temperature T.sub.2 which is virtually above the Curie temperature T.sub.C1 and sufficient to cause reversal of the magnetic moment in the second magnetic thin film, to thereby form an information bit (magnetic domains) in the first magnetic thin film, and adapts during the course the medium is cooled from the heated states such that two states established by the different relationships between the directions of magnetization of the first and second magnetic thin films are finally formed whereby the recording of the information is performed to achieve overwriting.
    • 本发明采用其热磁记录介质的基本结构,由具有垂直各向异性的第一和第二磁性薄膜和介于其间的具有面内磁各向异性或小的垂直磁各向异性的第三磁性薄膜组成的布置形成为 按照要记录的信息,依次磁耦合到相邻的薄膜上的层压结构,第一加热条件和第二加热条件,介质在方向上施加预定的外部磁场六边形 垂直于薄膜平面的第一个条件是将介质的温度提升到实质上高于第一磁性薄膜的居里温度TC1的第一温度T1,而不会使第二磁性体的磁矩反转 薄膜,第二个条件是提高温度 相当于实质上高于居里温度TC1的第二温度T2,并且足以引起第二磁性薄膜中的磁矩的反转,从而在第一磁性薄膜中形成信息位(磁畴),以及 在该过程中适应介质从加热状态冷却,使得由第一和第二磁性薄膜的磁化方向之间的不同关系建立的两个状态最终形成,由此执行信息的记录以实现覆盖。
    • 2. 再颁专利
    • Multilayer optical disk
    • 多层光盘
    • USRE40136E1
    • 2008-03-04
    • US11091006
    • 2005-03-25
    • Masahiko KanekoNobuhiko UmezuKatsuhisa ArataniAriyoshi Nakaoki
    • Masahiko KanekoNobuhiko UmezuKatsuhisa ArataniAriyoshi Nakaoki
    • B32B3/02
    • G11B7/244G11B7/24G11B7/2531G11B7/2534G11B7/257G11B7/258G11B7/2585G11B2007/2571G11B2007/25713Y10T428/21
    • A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing apparatus. The method of manufacturing a multilayer disk comprises the steps of forming a first substrate having a first information storage area enabling reproduction of information therein with a first light beam having a wavelength of 770 nm to 830 nm; forming a second substrate having a second information storage area enabling reproduction of information therein with a second light beam having a wavelength of 615-655 nm but which is relatively transparent with respect to said first light beam; and bonding said first substrate to said second substrate together without said first and second said information areas facing each other.
    • 具有信息存储层的多层光盘,其可以由通用再现装置(例如,光盘播放器)再现,并且可以通过使用专用再现装置从其它信息存储层读取信息。 制造多层盘的方法包括以下步骤:形成具有第一信息存储区域的第一基板,该第一信息存储区域能够利用波长为770nm至830nm的第一光束再现其中的信息; 形成具有第二信息存储区域的第二基板,所述第二信息存储区域能够利用波长为615-655nm但相对于所述第一光束相对透明的第二光束再现信息; 以及将所述第一基板与所述第二基板结合在一起,而所述第一和第二信息区域彼此面对。
    • 3. 发明授权
    • Multi-layer optical disk
    • 多层光盘
    • US5761187A
    • 1998-06-02
    • US697275
    • 1996-08-27
    • Masahiko KanekoKatsuhisa ArataniAriyoshi Nakaoki
    • Masahiko KanekoKatsuhisa ArataniAriyoshi Nakaoki
    • G11B7/24G11B7/256G11B7/258
    • G11B7/24G11B7/256G11B7/258
    • The present invention provides a multi-layer optical disk, in which even if a wave length of read light is changed at a time of reproducing, both of reproduction signals from a first information memory layer and a second information memory layer have sufficient levels. In a multi-layer optical disk, in which a first information memory layer and a second information memory layer are sequentially film-formed on a substrate and information recorded on the first information memory layer and the second information memory layer are reproduced by irradiating read light from a substrate side, the first information memory layer and the second information memory layer can be reproduced by a first read light and a second read light which is shorter in wave length than this first read light, and the first information memory layer is made of material in which a refractive index n and an extinction coefficient k in a wave length area of the first read light comply with the following conditions: 0.ltoreq.k.ltoreq.0.25 n=.alpha.-k+2.8 (where .alpha. is a constant and 0.15.ltoreq..alpha..ltoreq.0.45)
    • 本发明提供一种多层光盘,其中即使在再现时读取光的波长变化,来自第一信息存储层和第二信息存储层的再现信号都具有足够的电平。 在多层光盘中,第一信息存储层和第二信息存储层顺序成膜在衬底上,并且通过照射读取光来再现记录在第一信息存储层和第二信息存储层上的信息 可以通过第一读取光和比第一读取光更短波长的第二读取光再现第一信息存储层和第二信息存储层,并且第一信息存储层由基板侧构成,并且第一信息存储层由 在第一读取光的波长区域中的折射率n和消光系数k符合以下条件的材料:0 <= k
    • 9. 发明授权
    • Method of fabricating a high-density magnetooptic recording medium
    • 制造高密度磁光记录介质的方法
    • US5230930A
    • 1993-07-27
    • US832575
    • 1992-02-07
    • Katsuhisa ArataniMasahiko KanekoMasumi OhtaIsamu Nakao
    • Katsuhisa ArataniMasahiko KanekoMasumi OhtaIsamu Nakao
    • G11B11/10G11B11/105
    • G11B11/10582
    • A method of fabricating a magnetooptic recording medium (10) having at least a reproducing layer (11) and a recording layer (13), from which information is read out by changing the state of magnetization of the reproducing layer (11) comprises steps of forming the reproducing layer (11) on a substrate (21), putting a high-density magnetic recording medium (30) storing information in a high-density magnetic pattern into close contact with the reproducing layer (11) to copy the high-density magnetic pattern formed on the high-density magnetic recording medium (30) into the reproducing layer (11), and forming the recording layer (13) over the reproducing layer (11) after copying the high-density magnetic pattern into the reproducing layer, to copy the high-density magnetic pattern into the recording layer (13).
    • 一种制造具有至少再现层(11)和记录层(13)的磁光记录介质(10)的方法,通过改变再现层(11)的磁化状态从中读出信息,包括步骤: 在基板(21)上形成再现层(11),将存储高密度磁图案的信息的高密度磁记录介质(30)与再现层(11)紧密接触,以将高密度 在高密度磁记录介质(30)上形成到再现层(11)中的磁图案,以及在将高密度磁图案复制到再现层中之后,在再现层(11)上形成记录层(13) 以将高密度磁图案复制到记录层(13)中。