公开(公告)号：US5539709A

公开(公告)日：1996-07-23

申请号：US92686

申请日：1993-07-16

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10586 ,  G11B11/105 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10521

摘要： A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

摘要翻译： 使用具有向上磁化的位和在磁光记录介质的记录层上具有向下磁化的位的数据记录数据的磁光记录方法包括以下步骤：使用由第一层构成的多层磁记录介质 具有作为记录层的垂直磁各向异性，和具有作为参考层的垂直磁各向异性的第二层; 移动媒体; 施加初始场，使得在记录之前，记录层的磁化方向保持不变，并且参考层的磁化方向向上或向下排列; 将激光束照射到介质上; 根据要记录的二进制数据对激光束的强度进行脉冲调制; 当激光束被照射时，向照射部分施加偏置场; 并且当脉冲调制激光束的强度处于高电平时，形成具有向上磁化并具有向下磁化的位之一，并且当脉冲调制激光束的强度处于低电平时，形成 其他位

公开(公告)号：US5475657A

公开(公告)日：1995-12-12

申请号：US92056

申请日：1993-07-16

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B11/00 ,  G11B13/04

CPC分类号： G11B11/10519 ,  G11B11/105 ,  G11B11/10506 ,  G11B11/10521 ,  G11B11/10586 ,  Y10S428/90 ,  Y10S430/146 ,  Y10T428/12493 ,  Y10T428/12771 ,  Y10T428/12861 ,  Y10T428/12951

摘要： An overwrite capable magnetooptical recording apparatus comprises a moving magnetooptical recording medium to which is applied an initial magnetic field and a laser beam which irradiates the moving medium. The beam intensity is modulated, in accordance with binary data to be recorded, between a high beam intensity level that provides the medium with a first temperature suitable for forming one of a first bit having upward-magnetization and a second bit having downward-magnetization, and a low beam intensity level that provides the medium with a second temperature suitable for forming the other bit. A bias magnetic field is applied to a portion of the medium irradiated by the beam.

摘要翻译： 具有覆盖能力的磁光记录装置包括施加初始磁场的移动磁光记录介质和照射移动介质的激光束。 根据要记录的二进制数据，在提供介质的适合于形成具有向上磁化的第一位和具有向下磁化的第二位之一的第一温度的高光束强度水平之间调制光束强度， 以及向光束强度水平提供适合于形成其它钻头的第二温度的介质。 将偏置磁场施加到由光束照射的介质的一部分上。

公开(公告)号：US5367507A

公开(公告)日：1994-11-22

申请号：US91913

申请日：1993-07-16

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B13/04

CPC分类号： G11B11/105 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10519 ,  G11B11/10521 ,  G11B11/10586

摘要： A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

摘要翻译： 使用具有向上磁化的位和在磁光记录介质的记录层上具有向下磁化的位的数据记录数据的磁光记录方法包括以下步骤：使用由第一层构成的多层磁记录介质 具有作为记录层的垂直磁各向异性，和具有作为参考层的垂直磁各向异性的第二层; 移动媒体; 施加初始场，使得在记录之前，记录层的磁化方向保持不变，并且参考层的磁化方向向上或向下排列; 将激光束照射到介质上; 根据要记录的二进制数据对激光束的强度进行脉冲调制; 当激光束被照射时，向照射部分施加偏置场; 并且当脉冲调制激光束的强度处于高电平时，形成具有向上磁化并具有向下磁化的位之一，并且当脉冲调制激光束的强度处于低电平时，形成 其他位

公开(公告)号：US5440531A

公开(公告)日：1995-08-08

申请号：US275662

申请日：1994-07-15

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B13/04

CPC分类号： G11B11/10586 ,  G11B11/105 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10521

摘要： A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

摘要翻译： 使用具有向上磁化的位和在磁光记录介质的记录层上具有向下磁化的位的数据记录数据的磁光记录方法包括以下步骤：使用由第一层构成的多层磁记录介质 具有作为记录层的垂直磁各向异性，和具有作为参考层的垂直磁各向异性的第二层; 移动媒体; 施加初始场，使得在记录之前，记录层的磁化方向保持不变，并且参考层的磁化方向向上或向下排列; 将激光束照射到介质上; 根据要记录的二进制数据对激光束的强度进行脉冲调制; 当激光束被照射时，向照射部分施加偏置场; 并且当脉冲调制激光束的强度处于高电平时，形成具有向上磁化并具有向下磁化的位之一，并且当脉冲调制激光束的强度处于低电平时，形成 其他位

公开(公告)号：US5239524A

公开(公告)日：1993-08-24

申请号：US453255

申请日：1989-12-20

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105

CPC分类号： G11B11/10586 ,  G11B11/105 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10521

摘要： A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

摘要翻译： 使用具有向上磁化的位和在磁光记录介质的记录层上具有向下磁化的位的数据记录数据的磁光记录方法包括以下步骤：使用由第一层构成的多层磁记录介质 具有作为记录层的垂直磁各向异性，和具有作为参考层的垂直磁各向异性的第二层; 移动媒体; 施加初始场，使得在记录之前，记录层的磁化方向保持不变，并且参考层的磁化方向向上或向下排列; 将激光束照射到介质上; 根据要记录的二进制数据对激光束的强度进行脉冲调制; 当激光束被照射时，向照射部分施加偏置场; 并且当脉冲调制激光束的强度处于高电平时，形成具有向上磁化并具有向下磁化的位之一，并且当脉冲调制激光束的强度处于低电平时，形成 其他位

公开(公告)号：US5680373A

公开(公告)日：1997-10-21

申请号：US370360

申请日：1995-01-09

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B11/00

CPC分类号： G11B11/105 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10519 ,  G11B11/10521 ,  G11B11/10586

摘要： In a magnetooptical reproducing apparatus and method, data recorded in a first layer of a magnetooptical recording medium is transcribed to a second layer by a reproduction magnetic field and is optically reproduced from the second layer.

摘要翻译： 在磁光再现装置和方法中，记录在磁光记录介质的第一层中的数据通过再现磁场转录到第二层，并从第二层被光学再现。

公开(公告)号：US5458987A

公开(公告)日：1995-10-17

申请号：US91904

申请日：1993-07-16

申请人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Jun Saito ,  Hideki Akasaka

IPC分类号： G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10519 ,  G11B11/105 ,  G11B11/10506 ,  G11B11/10521 ,  G11B11/10586 ,  Y10S428/90 ,  Y10S430/146 ,  Y10T428/12493 ,  Y10T428/12771 ,  Y10T428/12861 ,  Y10T428/12951

摘要： A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

摘要翻译： 使用具有向上磁化的位和在磁光记录介质的记录层上具有向下磁化的位的数据记录数据的磁光记录方法包括以下步骤：使用由第一层构成的多层磁记录介质 具有作为记录层的垂直磁各向异性，和具有作为参考层的垂直磁各向异性的第二层; 移动媒体; 施加初始场，使得在记录之前，记录层的磁化方向保持不变，并且参考层的磁化方向向上或向下排列; 将激光束照射到介质上; 根据要记录的二进制数据对激光束的强度进行脉冲调制; 当激光束被照射时，向照射部分施加偏置场; 并且当脉冲调制激光束的强度处于高电平时，形成具有向上磁化并具有向下磁化的位之一，并且当脉冲调制激光束的强度处于低电平时，形成 其他位

公开(公告)号：US5389455A

公开(公告)日：1995-02-14

申请号：US948166

申请日：1992-09-21

申请人： Jun Saito ,  Tetsuo Hosokawa ,  Akio Okamuro ,  Hiroyuki Matsumoto ,  Haruhisa Iida ,  Satomi Kokai ,  Hideki Akasaka

发明人： Jun Saito ,  Tetsuo Hosokawa ,  Akio Okamuro ,  Hiroyuki Matsumoto ,  Haruhisa Iida ,  Satomi Kokai ,  Hideki Akasaka

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10586 ,  Y10S428/90

摘要： A medium includes a readout layer, a memory layer, an adjusting layer for an exchange coupling force .sigma..sub.W, and a writing layer, and can perform an over-write operation upon radiation of a modulated laser beam. The readout layer essentially consists of GdFeCo, the memory layer essentially consists of TbFeCo, the adjusting layer essentially consists of GdFeCo, and the writing layer essentially consists of DyFeCo. The C/N ratio of the medium exceeds 53 dB. The C/N ratio is a value obtained when a plurality of mark.sup.H having a period of 1.6 .mu.m are written, and are read out so that medium noise is maximized as compared to other noise components.

摘要翻译： 介质包括读出层，存储层，用于交换耦合力σW的调整层和写入层，并且可以在调制的激光束的辐射时执行过写操作。 读出层基本上由GdFeCo组成，记忆层主要由TbFeCo组成，调整层基本上由GdFeCo组成，写层基本上由DyFeCo组成。 介质的C / N比超过53 dB。 C / N比是写入具有1.6μm的周期的多个标记H时获得的值，并且被读出，使得与其它噪声分量相比中等噪声最大化。

公开(公告)号：US5126986A

公开(公告)日：1992-06-30

申请号：US668376

申请日：1991-03-11

申请人： Jun Saito ,  Masatoshi Sato ,  Hiroyuki Matsumoto

发明人： Jun Saito ,  Masatoshi Sato ,  Hiroyuki Matsumoto

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10591 ,  G11B11/10506 ,  G11B11/10517 ,  G11B11/10519 ,  G11B11/10532 ,  G11B11/10552 ,  G11B11/10534 ,  Y10S428/928 ,  Y10T428/12465

摘要： A multi-layered magnetooptical recording medium that satisfies predetermined formulas is over write capable when used, in a recording method and apparatus, with a jointing field, i.e., a magnetic field the intensity of which decreases continuously from an initial field to a bias field having the same direction as the initial field, permitting greater freedom in the choice of media compositions. In a two-layer structure including magnetically coupled recording and reference layers, recorded data may advantageously be reproduced from the reference layer.

摘要翻译： 满足预定公式的多层磁光记录介质在使用时具有过写能力，在记录方法和装置中具有连接场，即其强度从初始场连续减小到具有 与初始场相同的方向，允许在选择媒体作品时更大的自由度。 在包括磁耦合记录和参考层的两层结构中，可以有利地从参考层再现所记录的数据。

公开(公告)号：USRE35630E

公开(公告)日：1997-10-14

申请号：US269395

申请日：1994-06-30

申请人： Jun Saito ,  Masatoshi Sato ,  Hiroyuki Matsumoto

发明人： Jun Saito ,  Masatoshi Sato ,  Hiroyuki Matsumoto

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10591 ,  G11B11/10506 ,  G11B11/10517 ,  G11B11/10519 ,  G11B11/10532 ,  G11B11/10552 ,  G11B11/10534 ,  Y10S428/928 ,  Y10T428/12465

摘要： A multi-layered magnetooptical recording medium that satisfies predetermined formulas is over write capable when used, in a recording method and apparatus, with a jointing field, i.e., a magnetic field the intensity of which decreases continuously from an initial field to a bias field having the same direction as the initial field, permitting greater freedom in the choice of media compositions. In a two-layer structure including magnetically coupled recording and reference layers, recorded data may advantageously be reproduced from the reference layer.

摘要翻译： 满足预定公式的多层磁光记录介质在使用时具有过写能力，在记录方法和装置中具有连接场，即其强度从初始场连续减小到具有 与初始场相同的方向，允许在选择媒体作品时更大的自由度。 在包括磁耦合记录和参考层的两层结构中，可以有利地从参考层再现所记录的数据。