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    Magneto-optical recording medium
    1.
    发明授权
    Magneto-optical recording medium 失效
    磁光记录介质

    公开(公告)号：US06200673B1

    公开(公告)日：2001-03-13

    申请号：US07607870

    申请日：1990-11-01

    申请人： Harukazu Miyamoto ,  Toshio Niihara ,  Motoyasu Terao ,  Norio Ohta ,  Masaaki Kurebayashi

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

    IPC分类号： G11B566

    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 and a magnetic layer composed of at least a recording layer and a supporting layer 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 has a lower Curie temperature than has the supporting layer and recording layer is thin enough for the laser beam to pass through. A magneto-optical recording medium as defined above, wherein the supporting layer is composed of a first supporting layer and a second supporting layer, and the recording layer, the first supporting layer, and the second supporting layer have Curie temperatures of T1, T2, and T3, respectively, which satisfy the following relationship. T1

    摘要翻译： 一种磁光记录介质，具有基板和由至少记录层和支撑层构成的磁性层，并且能够通过利用这样的事实来检索信息，即当用激光束照射时产生磁光效应 其影响其反射光，其特征在于记录层具有比支撑层低的居里温度，并且记录层足够薄以使激光束通过。1.如上所述的磁光记录介质，其中支撑层 由第一支撑层和第二支撑层组成，并且记录层，第一支撑层和第二支撑层分别具有满足以下关系的T1，T2和T3的居里温度。 光记录介质，其中记录层具有比具有支撑层的更高的居里温度。由于上述 特征，本发明的磁光记录介质能够重写并具有改进的记录灵敏度。

    Information recording medium with clock information therein
    2.
    发明授权
    Information recording medium with clock information therein 失效
    具有时钟信息的信息记录介质

    公开(公告)号：US5959943A

    公开(公告)日：1999-09-28

    申请号：US932056

    申请日：1997-09-17

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

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

    IPC分类号： G11B20/10 ,  G11B5/02 ,  G11B7/006 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B27/19 ,  G11B27/30 ,  G11B11/00

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

    摘要： A magneto-optical data recording system comprises magnetic field pulse applying means for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and means 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 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 driven by code data from a source of code data (data generator). The heating means includes an optical head which comprises a source of laser beam driven by a laser driver and an optical system which focuses the laser beam from the source of laser beam as a small light spot onto the recording medium.

    摘要翻译： 一种磁光数据记录系统，包括磁场脉冲施加装置，用于向磁光记录介质施加与要记录的代码数据相对应的极性的磁场脉冲，以及用于以脉动方式加热记录介质的装置， 与要记录的代码数据同步的预定频率。 在记录期间，磁场脉冲施加装置沿着记录介质的轨道施加与代码数据对应的极性的磁场脉冲，并且加热装置以与代码数据同步的预定频率的脉动方式连续地加热记录介质 从而直接覆盖代码数据。 磁场脉冲施加装置包括由代码数据源（数据发生器）的代码数据驱动的磁线圈。 加热装置包括光学头，其包括由激光驱动器驱动的激光束源和将来自激光源的激光束作为小光点聚焦到记录介质上的光学系统。

    Magneto-optical disk
    3.
    发明授权
    Magneto-optical disk 失效
    磁光盘

    公开(公告)号：US5654058A

    公开(公告)日：1997-08-05

    申请号：US310006

    申请日：1994-09-21

    申请人： Fumiyoshi Kirino ,  Harukazu Miyamoto ,  Shigenori Okamine ,  Noriyuki Ogihara ,  Masahiko Takahashi ,  Norio Ohta ,  Toshio Niihara

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

    IPC分类号： G11B11/105 ,  G11B5/66

    CPC分类号： G11B11/1053 ,  G11B11/10586 ,  G11B11/10589 ,  G11B11/10591 ,  G11B11/10593 ,  G11B11/10508 ,  G11B11/10519 ,  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, a magneto-optical recording layer, a second dielectric layer and a metallic layer, laid on a disk substrate provided with guide tracks, temperature distribution of the magneto-optical recording layer is controlled by controlling the thermal diffusivity of the metallic layer, 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 no 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.

    摘要翻译： 在用于用激光束记录，再现或擦除的磁光盘中，其包括由第一介电层，磁光记录层，第二电介质层和金属层组成的四层结构的膜，铺设 在设置有导轨的盘基板上，通过控制金属层的热扩散率来控制磁光记录层的温度分布，从而提高记录/再现/擦除重复特性。 在本结构的盘中，从激光束的中心向较高的区域升温，从而可以获得考虑到磁道偏移的完全宽的擦除域宽度，并且在擦除之后不会留下记录域。 与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。 当本结构的磁盘进行现场调制记录时，可以缩短磁场调制记录特有的箭头 - 羽状记录区的尾部，并克服间断干扰，导致C / N（S / N）比，并且可以进行高密度记录。

    Magneto-optical recording medium having dielectric layers with different indices of refraction
    5.
    发明授权
    Magneto-optical recording medium having dielectric layers with different indices of refraction 失效
    具有不同折射率的电介质层的磁光记录介质

    公开(公告)号：US5914198A

    公开(公告)日：1999-06-22

    申请号：US831262

    申请日：1997-04-07

    申请人： Harukazu Miyamoto ,  Toshio Niihara ,  Norio Ohta ,  Fumiyoshi Kirino

    发明人： Harukazu Miyamoto ,  Toshio Niihara ,  Norio Ohta ,  Fumiyoshi Kirino

    IPC分类号： G11B11/105 ,  G11B5/66

    CPC分类号： G11B11/10593 ,  G11B11/10584 ,  Y10S428/90

    摘要： In a magneto-optical recording medium which comprises a transparent substrate, a first dielectric film, a magnetic film, a second dielectric film and a metal reflective film, formed successively one upon another, Kerr rotation angle can be increased without lowering the reflectivity by setting the thickness of the first dielectric film to 120-220% of a minimum film thickness among film thicknesses showing a minimum reflectivity and setting the thickness of the second dielectric film to 80-120% of a film thickness showing a maximum Kerr rotation angle and furthermore by making the refractive index of the first dielectric film lower than that of the second dielectric film.

    摘要翻译： 在包括透明基板的磁光记录介质中，可以相互依次形成的第一电介质膜，磁膜，第二电介质膜和金属反射膜，可以增加克尔旋转角度，而不会通过设定降低反射率 第一电介质膜的厚度为薄膜厚度的最小膜厚的120-220％，表示最小的反射率，并将第二电介质膜的厚度设定为显示最大克尔旋转角度的膜厚度的80-120％ 通过使第一电介质膜的折射率低于第二电介质膜的折射率。

    Magneto-optical disk and process for manufacturing the same
    7.
    发明授权
    Magneto-optical disk and process for manufacturing the same 失效
    磁光盘及其制造方法

    公开(公告)号：US5179546A

    公开(公告)日：1993-01-12

    申请号：US631984

    申请日：1990-12-21

    申请人： Yumiko Anzai ,  Yoshinori Miyamura ,  Toshio Niihara ,  Harukazu Miyamoto ,  Norio Ohta

    发明人： Yumiko Anzai ,  Yoshinori Miyamura ,  Toshio Niihara ,  Harukazu Miyamoto ,  Norio Ohta

    IPC分类号： G11B11/10 ,  G11B7/26 ,  G11B11/105

    CPC分类号： G11B11/10584 ,  G11B11/10582 ,  G11B7/26

    摘要： A magneto-optical disk which has a circular disk form and comprises a substrate provided with information pits and a guide groove, a recording medium layer provided on the substrate, and a protective layer formed of at least one thin film on the medium layer, in which the surface of the protective layer is minutely roughened to have a concave rough pattern and not to substantially protrude beyond a reference level composed of the outermost surface portions of the protective layer. When the magneto-optical disk is subjected to recording by a CSS system using an air floating magnetic head conforming to high-frequency recording in a magnetic field modulation type recording, which is one of methods of overwrite recording on magneto-optical disks, the minute concave rough pattern formed on the surface of the disk substrate prevents such troubles as adhesion of the magnetic head to the surface of the disk and collision between the disk substrate being rotated and the head.

    摘要翻译： 一种具有圆盘形状并包括设置有信息凹坑的衬底和引导槽的磁光盘，设置在衬底上的记录介质层和由介质层上的至少一层薄膜形成的保护层， 其保护层的表面被微小地粗糙化以具有凹形粗糙图案，并且基本上不突出超过由保护层的最外表面部分组成的基准水平。 当磁光盘通过使用在磁光调制型记录中的符合高频记录的空气浮动磁头的CSS系统进行记录时，其是在磁光盘上重写记录的方法之一，分钟 形成在盘基板表面上的凹形粗糙图案防止了磁头粘附到盘表面和盘基片旋转与头部之间的碰撞等问题。

    Magneto-optical data recording system continuously irradiating optical pulsers
    8.
    发明授权
    Magneto-optical data recording system continuously irradiating optical pulsers 失效
    磁光数据记录系统连续照射光脉冲器

    公开(公告)号：US5473581A

    公开(公告)日：1995-12-05

    申请号：US979338

    申请日：1992-11-20

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

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

    IPC分类号： G11B20/10 ,  G11B5/02 ,  G11B7/006 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B27/19 ,  G11B27/30 ,  G11B11/00

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

    摘要： A magneto-optical data recording system comprises magnetic field pulse applying apparatus for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and apparatus 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 apparatus applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating apparatus 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 apparatus includes a magnetic coil driven by code data from a source of code data (data generator). The heating apparatus includes an optical head which comprises a source of laser beam driven by a laser driver and an optical system which focuses the laser beam from the source of laser beam as a small light spot onto the recording medium.

    摘要翻译： 一种磁光数据记录系统，包括磁场脉冲施加装置，用于向磁光记录介质施加与要记录的代码数据相对应的极性的磁场脉冲，以及用于以脉动方式加热记录介质的装置， 与要记录的代码数据同步的预定频率。 在记录期间，磁场脉冲施加装置沿着记录介质的轨道施加与代码数据对应的极性的磁场脉冲，并且加热装置以与代码数据同步的预定频率的脉动方式连续地加热记录介质 从而直接覆盖代码数据。 磁场脉冲施加装置包括由代码数据源（数据发生器）的代码数据驱动的磁线圈。 加热装置包括光学头，其包括由激光驱动器驱动的激光束源和将来自激光源的激光束作为小光点聚焦到记录介质上的光学系统。