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：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：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：US4853912A

公开(公告)日：1989-08-01

申请号：US131327

申请日：1987-12-08

申请人： Hideki Akasaka ,  Masatoshi Sato

发明人： Hideki Akasaka ,  Masatoshi Sato

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10586 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10584

摘要： A magneto-optical recording process is produced by irradiating a recording track of a recording medium, in the course of movement thereof, with a main light beam of intensity sufficient for heating the medium to a temperature at which the coercive force thereof is reduced to zero or a very small value in a continuous manner during the recording operation and irradiating a separating area with a subsidiary beam of a modulated intensity, thereby modulating the vertical magnetization of said separating area. A floating magnetic field generated by the thus modulated vertical magnetization generates magnetic fields of mutually different directions, thus forming a record bit on the recording track.

摘要翻译： 磁光记录过程是通过在其移动过程中用记录介质的记录轨道照射强度足以将介质加热至其矫顽力降至零的温度的主光束来产生的 或在记录操作期间以连续的方式具有非常小的值，并且利用调制强度的辅助光束照射分离区域，从而调制所述分离区域的垂直磁化。 由这样调制的垂直磁化产生的浮动磁场产生相互不同方向的磁场，从而在记录磁道上形成记录位。

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：US5014252A

公开(公告)日：1991-05-07

申请号：US570978

申请日：1990-08-22

申请人： Hideki Akasaka ,  Masatoshi Sato

发明人： Hideki Akasaka ,  Masatoshi Sato

IPC分类号： G11B11/105

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

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 two adjacent laser beams, i.e., a leading beam and a trailing beam onto the medium; the leading beam being an erasing beam of low level which is not modulated in principle; the trailing beam is a writing beam which is pulse modulated between high level and basis level in accordance with binary data to be recorded; and the basis level being able to have an intensity equal to or lower than the low level and to be zero level; when the trailing 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 when the leading low-level laser beam is radiated, 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：将作为介质的多层磁记录介质用作第一 具有作为记录层的垂直磁各向异性的层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; 将两个相邻的激光束，即前导光束和后向光束照射到介质上; 前导光束是原则上未调制的低电平擦除光束; 拖尾光束是根据要记录的二进制数据在高电平和基准电平之间进行脉冲调制的写入光束; 并且基准能够具有等于或低于低水平的强度并且为零水平; 当后向激光束被照射时，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，形成具有向上磁化的位之一，并且当引导低级激光束被辐射时，形成另一位。

公开(公告)号：US5204193A

公开(公告)日：1993-04-20

申请号：US734119

申请日：1991-07-25

申请人： Masatoshi Sato ,  Hideki Akasaka

发明人： Masatoshi Sato ,  Hideki Akasaka

IPC分类号： C22C38/00 ,  C22C19/07 ,  C22C38/10 ,  C22C45/00 ,  C22C45/04 ,  G11B11/10 ,  G11B11/105 ,  G11C13/06 ,  H01F10/12 ,  H01F10/13 ,  H01F10/16

CPC分类号： G11B11/105 ,  G11B11/10586 ,  Y10S428/90

摘要： A Curie temperature (Tc) writing magnetooptical recording medium which uses a dual perpendicular magnetic layer is composed of a first layer having a low Curie point (TL) and a high coercive force (HH) and a second layer having a relatively high Curie point (TH) and low coercive force (HL) and wherein data is written by applying an external magnetic field to the medium which is heated to a temperature higher than the low Curie point (TL) and lower than the high Curie point (TH). The Tc writing magnetooptical recording medium is characterized in that both the first and second layers are made of an RE-Fe-Co amorphous alloy, wherein the RE represents at least one rare earth metal selected from the group consisting of Tb, Dy, Gd and Ho.

摘要翻译： 使用双垂直磁性层的书写磁光记录介质的居里温度（Tc）由具有低居里点（TL）和高矫顽力（HH）的第一层和具有较高居里点的第二层 TH）和低矫顽力（HL），并且其中通过向被加热到高于低居里点（TL）并低于高居里点（TH）的温度的介质施加外部磁场来写入数据。 Tc写磁光记录介质的特征在于，第一层和第二层均由RE-Fe-Co非晶合金制成，其中RE表示选自Tb，Dy，Gd中的至少一种稀土金属和 何