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    Magneto-optical disk
    2.
    发明公开
    Magneto-optical disk 失效
    Magneto-optische Scheibe。

    公开(公告)号：EP0282744A2

    公开(公告)日：1988-09-21

    申请号：EP88102182.8

    申请日：1988-02-15

    申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

    发明人： Niihara, Toshio ,  Ito, Masaru ,  Shigematsu, Kazuo ,  Kaku, Toshimitsu ,  Taii, Toshiaki Hitachi Makuseru Shihoryo ,  Ohta, Norio ,  Yoshihiro, Masafumi Hitachi Makuseru Shioryo

    IPC分类号： G11B11/10

    CPC分类号： G11B7/0938 ,  G11B11/10582

    摘要： A magneto-optical disk comprises at least a transparent substrate (1) having V-shaped grooves (6) formed therein, a transparent film (3) having a greater refractive index than that of the transparent substrate and a magnetic film (4). Information is recorded between adjacent ones of the V-shaped grooves (6). The V-shaped groove (6) has a depth shallower than λ/6 and deeper than λ/8 where λ represents wave length of laser light with which the magneto-optical disk is irradiated. Optimal tracking signal can be obtained without lowering the push-pull signal intensity for the tracking.

    摘要翻译： 磁光盘至少包括其中形成有V形槽（6）的透明基板（1），具有比透明基板更大的折射率的透明膜（3）和磁性膜（4）。 在相邻的V形槽（6）之间记录信息。 V形槽（6）的深度比λ/ 6浅，深于λ/ 8，其中λ表示照射磁光盘的激光的波长。 可以在不降低跟踪的推挽信号强度的情况下获得最佳跟踪信号。

    Magneto-optical recording medium
    3.
    发明公开
    Magneto-optical recording medium 失效
    磁选机Aufzeichnungsträger。

    公开(公告)号：EP0428128A2

    公开(公告)日：1991-05-22

    申请号：EP90121683.8

    申请日：1990-11-13

    申请人： HITACHI, LTD. ,  HITACHI MAXELL, LTD.

    发明人： Miyamoto, Harukazu ,  Niihara, Toshio ,  Terao, Motoyasu ,  Ohta, Norio ,  Kurebayashi, Masaaki

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10523 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10519 ,  G11B11/10586 ,  Y10T428/265

    摘要： A magneto-optical recording medium having a substrate (1) and a magnetic layer composed of at least a recording layer (3) and a supporting layer (4) and being capable of retrieving information by utilizing the fact that when it is irradiated with a laser beam it produces the magneto-optical effect which affects its reflected light, characterized in that the recording layer (3) has a lower Curie temperature than has the supporting layer (4) and the recording layer (3) is thin enough for the laser beam to pass through.
    A magneto-optical recording medium as defined above, wherein the supporting layer (4) is composed of a first supporting layer and a second supporting layer, and the recording layer (3), the first supporting layer, and the second supporting layer have Curie temperatures of T₁, T₂, and T₃, respectively, which satisfy the following relationship.
    T₁
    A magneto-optical recording medium defined as above, wherein the recording layer (3) has a higher Curie temperature than has the supporting layer (4).
    Owing to the above-mentioned features, the magneto-optical recording media of the present invention are capable of overwriting and have improved recording sensitivity.

    摘要翻译： 一种磁光记录介质，具有基板（1）和由至少记录层（3）和支撑层（4）构成的磁性层，并且能够通过利用以下事实来检索信息： 激光束产生影响其反射光的磁光效应，其特征在于记录层（3）具有比支撑层（4）更低的居里温度，并且记录层（3）对于激光器足够薄 光束通过。 如上所述的磁光记录介质，其中所述支撑层（4）由第一支撑层和第二支撑层构成，并且所述记录层（3），所述第一支撑层和所述第二支撑层具有居里 分别满足以下关系的T1，T2和T3的温度。 T1 / = T3如上定义的磁光记录介质，其中记录层（3）具有比具有支撑层（4）的更高的居里温度。 由于上述特征，本发明的磁光记录介质能够重写并具有提高的记录灵敏度。

    Magneto-optical system
    5.
    发明公开
    Magneto-optical system 失效
    Magneto-optische Scheibe。

    公开(公告)号：EP0368194A2

    公开(公告)日：1990-05-16

    申请号：EP89120477.8

    申请日：1989-11-06

    申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

    发明人： Kirino, Fumiyoshi Sanikopo Takaidohigashi 401 ,  Miyamoto, Harukazu ,  Okamine, Shigenori ,  Ogihara, Noriyuki ,  Takahashi, Masahiko ,  Ohta, Norio ,  Niihara, Toshio

    IPC分类号： G11B11/10

    CPC分类号： G11B11/1053 ,  G11B11/10508 ,  G11B11/10519 ,  G11B11/10586 ,  G11B11/10589 ,  G11B11/10591 ,  G11B11/10593 ,  Y10S428/90

    摘要： In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer (2), a magneto-optical recording layer (3), a second dielectric layer (4) and a metallic layer (5), laid on a disk substrate (1) provided with guide tracks, temperature distribution of the magneto-optical recording layer (3) is controlled by controlling the thermal diffusivity of the metallic layer (5), and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and not recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made. By endowing a Kerr enhancement action to the second dielectric layer (4) and a protective action on the magneto-optical layer (3) to the first dielectric layer (2), only the reliability can be improved without lowering the C/N ratio. By improving the corrosion resistance of the magneto-optical recording layer, the first dielectric layer (2) can be omitted to the contrary, and a magneto-optical disk of simple structure can be obtained and used as memory for domestic applications or communication fields.

    摘要翻译： 在用于用激光束进行记录，再现或擦除的磁光盘中，其包括由第一介电层（2），磁光记录层（3），第二电介质层 （4）和设置有导轨的盘基板（1）上的金属层（5），通过控制金属层（5）的热扩散率来控制磁光记录层（3）的温度分布， ，并且由此提高记录/再现/擦除重复特性。 在本结构的盘中，从激光束的中心向温度升高的范围，因此可以获得考虑到磁道偏移的彻底宽的擦除域宽度，并且在擦除之后不会保留记录域。 与由没有任何金属层的三层结构的盘相比，再现信号输出增加了4dB，因为由于克尔效应和法拉第效应都增加了光束利用效率。 当对本结构的盘进行现场调制记录时，可以缩短场调制记录特有的箭头形状的记录区的尾部，并克服间隙干扰，导致C / N（S / N）比，并且可以进行高密度记录。 通过向第二电介质层（4）赋予克尔增强作用和对第一电介质层（2）的磁光层（3）的保护作用，仅在不降低C / N比的情况下可以提高可靠性。 通过提高磁光记录层的耐腐蚀性，可以省略第一介电层（2），并且可以获得简单结构的磁光盘并将其用作家用或通信领域的存储器。

    Magneto-optical recording medium
    6.
    发明公开
    Magneto-optical recording medium 失效
    磁光记录介质

    公开(公告)号：EP0428128A3

    公开(公告)日：1992-10-21

    申请号：EP90121683.8

    申请日：1990-11-13

    申请人： HITACHI, LTD. ,  HITACHI MAXELL, LTD.

    发明人： Miyamoto, Harukazu ,  Niihara, Toshio ,  Terao, Motoyasu ,  Ohta, Norio ,  Kurebayashi, Masaaki

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10523 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10519 ,  G11B11/10586 ,  Y10T428/265

    摘要： A magneto-optical recording medium having a substrate (1) and a magnetic layer composed of at least a recording layer (3) and a supporting layer (4) and being capable of retrieving information by utilizing the fact that when it is irradiated with a laser beam it produces the magneto-optical effect which affects its reflected light, characterized in that the recording layer (3) has a lower Curie temperature than has the supporting layer (4) and the recording layer (3) is thin enough for the laser beam to pass through. A magneto-optical recording medium as defined above, wherein the supporting layer (4) is composed of a first supporting layer and a second supporting layer, and the recording layer (3), the first supporting layer, and the second supporting layer have Curie temperatures of T₁, T₂, and T₃, respectively, which satisfy the following relationship.
    T₁ A magneto-optical recording medium defined as above, wherein the recording layer (3) has a higher Curie temperature than has the supporting layer (4). Owing to the above-mentioned features, the magneto-optical recording media of the present invention are capable of overwriting and have improved recording sensitivity.

    摘要翻译： 一种磁光记录媒体，它具有基片（1）和至少由记录层（3）和支持层（4）构成的磁性层，并且能够利用这样的事实来检索信息，即当它被照射 激光束产生影响其反射光的磁光效应，其特征在于记录层（3）具有比支撑层（4）低的居里温度，并且记录层（3）对于激光来说足够薄 光束通过。 一种如上定义的磁光记录介质，其中支撑层（4）由第一支撑层和第二支撑层组成，并且记录层（3），第一支撑层和第二支撑层具有居里 温度T 1，T 2和T 3分别满足以下关系。 T 1

    Magneto-optical system
    8.
    发明公开
    Magneto-optical system 失效
    磁光系统

    公开(公告)号：EP0368194A3

    公开(公告)日：1992-03-04

    申请号：EP89120477.8

    申请日：1989-11-06

    申请人： HITACHI, LTD. ,  Hitachi Maxell Ltd.

    发明人： Kirino, Fumiyoshi Sanikopo Takaidohigashi 401 ,  Miyamoto, Harukazu ,  Okamine, Shigenori ,  Ogihara, Noriyuki ,  Takahashi, Masahiko ,  Ohta, Norio ,  Niihara, Toshio

    IPC分类号： G11B11/10

    CPC分类号： G11B11/1053 ,  G11B11/10508 ,  G11B11/10519 ,  G11B11/10586 ,  G11B11/10589 ,  G11B11/10591 ,  G11B11/10593 ,  Y10S428/90

    摘要： In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer (2), a magneto-optical recording layer (3), a second dielectric layer (4) and a metallic layer (5), laid on a disk substrate (1) provided with guide tracks, temperature distribution of the magneto-optical recording layer (3) is controlled by controlling the thermal diffusivity of the metallic layer (5), and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and not recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made. By endowing a Kerr enhancement action to the second dielectric layer (4) and a protective action on the magneto-optical layer (3) to the first dielectric layer (2), only the reliability can be improved without lowering the C/N ratio. By improving the corrosion resistance of the magneto-optical recording layer, the first dielectric layer (2) can be omitted to the contrary, and a magneto-optical disk of simple structure can be obtained and used as memory for domestic applications or communication fields.

    摘要翻译： 在由激光束进行记录，再现或擦除的磁光盘中，该磁光盘包括由第一介质层（2），磁光记录层（3），第二介质层 （5）的热扩散率来控制所述磁光记录层（3）的温度分布，所述磁光记录层（3）的温度分布通过控制所述金属层（5）的热扩散率来控制，所述金属层（5） 从而改善记录/再现/擦除重复特性。 在本结构的光盘中，温度从激光束的中心在更宽的区域内升高，因此可以获得考虑轨道偏移的彻底宽的擦除区域宽度，并且在擦除之后不会留下记录区域。 由于克尔效应和法拉第效应两者都增加了光束利用效率，与由没有任何金属层的三层结构盘所获得的信号相比，再现信号输出增加了4dB。 当本结构的盘受到场调制记录时，可以缩短场调制记录特有的箭形羽状记录域的尾部，并且可以克服码间干扰，导致C / N（S / N）比例并且可以进行高密度记录。 通过赋予第二电介质层（4）克尔增强作用和在磁光层（3）上对第一电介质层（2）的保护作用，可以在不降低C / N比的情况下仅提高可靠性。 通过改善磁光记录层的耐腐蚀性，相反可以省略第一电介质层（2），并且可以获得结构简单的磁光盘并将其用作家庭应用或通信领域的存储器。

    Magneto-optical data recording system
    10.
    发明公开
    Magneto-optical data recording system 失效
    磁光数据记录系统

    公开(公告)号：EP0342624A3

    公开(公告)日：1990-11-22

    申请号：EP89108826.2

    申请日：1989-05-17

    申请人： HITACHI, LTD.

    发明人： Yonezawa, Seiji ,  Ohta, Norio ,  Niihara, Toshio ,  Kataoka, Keiji ,  Takahashi, Masahiko ,  Miyamoto, Harukazu ,  Sukeda, Hirofumi ,  Tsuyoshi, Toshiaki

    IPC分类号： G11B11/10

    CPC分类号： G11B7/00745 ,  G11B7/006 ,  G11B11/10513 ,  G11B11/10521 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595 ,  G11B27/19 ,  G11B27/3027

    摘要： A magneto-optical data recording system comprises magnetic field pulse applying means (27) for applying to a magneto-optic recording medium (1) a magnetic field pulse of a polarity corresponding to code data to be recorded, and means (23, 24, 26, 28) for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying means (27) applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating means continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying means includes a magnetic coil (27) driven by code data from a source of code data (data generator) (37). The heating means includes an optical head which comprises a source of laser beam (23) driven by a laser driver (26) and an optical system (24, 28) which focuses the laser beam from the source of laser beam (23) as a small light spot onto the recording medium (1).