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    Magneto-optical recording medium and manufacturing method thereof
    1.
    发明授权
    Magneto-optical recording medium and manufacturing method thereof 失效
    磁光记录介质及其制造方法

    公开(公告)号：US5968678A

    公开(公告)日：1999-10-19

    申请号：US689149

    申请日：1996-07-30

    申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Seiji Murata ,  Kenji Torasawa

    发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Yoshihisa Suzuki ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Seiji Murata ,  Kenji Torasawa

    IPC分类号： G11B11/105 ,  G11B5/66

    CPC分类号： G11B11/1051 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10586 ,  G11B11/10595 ,  Y10S428/90

    摘要： In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 .ANG. and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness of 800 to 1200 .ANG. with Gd content of 30 to 36 at. % and Co content of 12 to 50 at. % is formed. On the reading layer, a TbFeCo recording layer of which Co content is 10 to 16 at. % is formed. The recording layer is a perpendicular magnetization film, and the reading layer is an in-plane magnetization film. At the time of reading, the reading and recording layers are heated, and the direction of magnetization of the recording layer is transferred to the reading layer only in the prescribed heated area. Information can be read only from the transferred portion, and thus a super resolution effect is obtained. When Kerr rotation angle .theta..sub.K is measured for the light reflected from the reading layer while the temperatures of the reading and recording layers are elevated, .theta..sub.K is approximately in proportion to Cth power of the elevated temperature t, wherein C is at least 8.0.

    摘要翻译： 在磁光记录介质中，在聚碳酸酯树脂的透明基板上形成厚度为600〜800的SiN膜，表面粗糙度Rmax为10nm以下。 在SiN膜上，具有800〜1200厚度的GdFeCo读取层，Gd含量为30〜36at。 ％，Co含量为12〜50。 ％ 形成了。 在读取层上，Co含量为10〜16at的TbFeCo记录层。 ％ 形成了。 记录层是垂直磁化膜，读取层是面内磁化膜。 在读取时，读取和记录层被加热，并且仅在规定的加热区域中记录层的磁化方向被转移到读取层。 信息只能从传送部分读取，从而获得超分辨率效果。 当读取层和记录层的温度升高时，对于从读取层反射的光测量克尔旋转角θK时，θK与升高温度t的Cth功率大致成比例，其中C至少为8.0。

    Recording and reproduction device for a magneto-optic recording medium capable of recording information according to optical super-resolution
    2.
    发明授权
    Recording and reproduction device for a magneto-optic recording medium capable of recording information according to optical super-resolution 失效
    能够根据光学超分辨率记录信息的磁光记录介质的记录和再现装置

    公开(公告)号：US06243326B1

    公开(公告)日：2001-06-05

    申请号：US09101800

    申请日：1998-10-19

    申请人： Satoshi Sumi ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Kenji Tanase ,  Yoshiharu Uchihara ,  Kenji Torazawa ,  Seiji Murata

    发明人： Satoshi Sumi ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Kenji Tanase ,  Yoshiharu Uchihara ,  Kenji Torazawa ,  Seiji Murata

    IPC分类号： G11B1100

    CPC分类号： G11B11/1051 ,  G11B11/10508 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10586

    摘要： A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer (6) on a recording layer (4) and still preferably has an intermediate layer (8) between a reproduction layer (3) and the recording layer (4). The recording/reproduction device includes a circuit (33) for pulsing a laser beam to be radiated to the magneto-optic disk and still preferably includes a polarization rotating unit (50) and a polarizing filter (51) for blocking only the center of the laser beam in reproduction. The heat emitting layer (6) diffusing any heat generated by the laser beam, and the discontinuously radiated laser beam allow small recording domain. The laser beam having its center blocked forms smaller main lobe due to diffraction effect.

    摘要翻译： 磁光盘及其记录/再现装置采用光学超分辨率来增加记录容量。 更具体地，磁光盘在记录层（4）上具有发热层（6），并且还优选地在再现层（3）和记录层（4）之间具有中间层（8）。 记录/再现装置包括用于脉冲激光束以辐射到磁光盘的电路（33），并且还优选地包括偏振旋转单元（50）和偏振滤光器（51），用于仅阻挡 激光束在再现。 发热层（6）扩散由激光束产生的热量，不连续辐射的激光束允许小的记录域。 具有中心阻挡的激光束由于衍射效应而形成较小的主瓣。

    Method of manufacturing optical disc
    3.
    发明授权
    Method of manufacturing optical disc 失效
    制造光盘的方法

    公开(公告)号：US4957776A

    公开(公告)日：1990-09-18

    申请号：US293748

    申请日：1989-01-03

    申请人： Masahiro Higuchi ,  Sadao Sakamoto ,  Yoshiharu Uchihara

    发明人： Masahiro Higuchi ,  Sadao Sakamoto ,  Yoshiharu Uchihara

    IPC分类号： G11B7/24 ,  G11B7/26

    CPC分类号： G11B7/26 ,  G11B7/24

    摘要： The method of manufacturing an optical disc related to the invention first forms warp prevention layer on one surface or the other surface of the disc substrate where information is recorded on one surface, and then, recording film covering the surface opposite from the surface having warp prevention layer or beam reflection film covering the information-recorded surface, and finally protection layer covering either the beam reflection film or the recording film, in this order. Thus the optical disc related to this invention can prevent damage and dust from incurring and adhering to the other surface of the disc substrate when forming these films on one surface so that the warp prevention layer can be perfectly level by suppressing swell of the layer itself. Since the warp prevention layer is formed on one surface before forming those films mentioned above on the other surface, the one surface maintains satisfactory wetness, and as a result, foam is rarely generated between the warp prevention layer and the disc substrate.Furthermore, the method of manufacturing an optical disc related to the invention introduces a system which measures the warp of the disc substrate coated with warp prevention layer before coating protection film, and then properly adjusts the thickness of the protection film to a specific thickness enough to fully cancel the warp. This effectively minimizes warping of the disc substrate itself.

    摘要翻译： 制造与本发明有关的光盘的方法首先在一个表面上记录信息的盘基片的一个表面或另一个表面上形成翘曲防止层，然后记录覆盖与具有经纱预防的表面相对的表面的膜 覆盖信息记录表面的层或光束反射膜，最后覆盖光束反射膜或记录膜的保护层。 因此，当在一个表面上形成这些膜时，与本发明相关的光盘可以防止损坏和灰尘引起并粘附到盘基片的另一个表面上，从而通过抑制层本身的膨胀来防止翘曲层的层次。 由于在另一个表面上形成上述那些膜之前，在一个表面上形成经纱防止层，所以一个表面保持令人满意的湿度，结果在翘曲防止层和盘基片之间很少产生泡沫。 此外，与本发明有关的光盘的制造方法引入了在涂布保护膜之前测量涂布有经线防止层的盘基板的翘曲的系统，然后将保护膜的厚度适当调整到足够的特定厚度， 完全取消翘曲。 这有效地最小化盘基片本身的翘曲。

    Information recording/reproducing apparatus to record/reproduce information on a recording medium recorded with an address mark
    7.
    发明授权
    Information recording/reproducing apparatus to record/reproduce information on a recording medium recorded with an address mark 有权
    用于在记录有地址标记的记录介质上记录/再现信息的信息记录/再现装置

    公开(公告)号：US06400653B1

    公开(公告)日：2002-06-04

    申请号：US09355831

    申请日：1999-08-05

    申请人： Kenji Torazawa ,  Kenji Asano ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Noboru Mamiya ,  Toshiaki Hioki

    发明人： Kenji Torazawa ,  Kenji Asano ,  Satoshi Sumi ,  Yoshiharu Uchihara ,  Noboru Mamiya ,  Toshiaki Hioki

    IPC分类号： G11B1100

    CPC分类号： G11B11/10584 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/00718 ,  G11B7/00745 ,  G11B11/10513 ,  G11B11/10515 ,  G11B11/10565 ,  G11B11/10578 ,  G11B11/10595 ,  G11B27/19 ,  G11B27/24 ,  G11B27/3027 ,  G11B2220/2525

    摘要： An magneto-optical disc recording/reproducing apparatus includes an optical head (36) to detect a wobble (46) and an address mark (81 to 84) in an magneto-optical disc (31) and output a wobble signal (WB1, WB2) and an address mark signal (AML, AMG), a PLL circuit (47) to generate a clock signal (CK) in response to wobble signal (WB1), an address mark synchronous signal generation circuit (46) to generate an address mark synchronous signal (AM) in response to address mark signal (AML, AMG), a synchronizing circuit (48) to synchronize clock signal (CK) with address mark synchronous signal (AM) and generate a synchronized clock signal (SCK), and a timing setting circuit (49) to generate a timing pulse signal (TG1) to control a magnetic head driving circuit (34) and a timing pulse signal (TG2) to control a laser driving circuit (35). The recording/reproducing apparatus can detect a address mark (81 to 84), record la data signal on magneto-optical disc (31) in synchronization with the detected address mark, and reproduce a data signal from magneto-optical disc (31) in synchronization with the detected address mark, so that the data signal can be surely recorded/reproduced.

    摘要翻译： 磁光盘记录/重放装置包括一个用于检测磁光盘（31）中的摆动（46）和地址标记（81至84）的光头（36），并输出摆动信号（WB1，WB2 ）和地址标记信号（AML，AMG），PLL电路（47），用于响应于摆动信号（WB1）产生时钟信号（CK），地址标记同步信号产生电路（46）产生地址标记 响应于地址标记信号（AML，AMG）的同步信号（AM），同步电路（48），用于将时钟信号（CK）与地址标记同步信号（AM）同步并产生同步时钟信号（SCK），以及 定时设定电路（49），生成用于控制磁头驱动电路（34）的定时脉冲信号（TG1）和定时脉冲信号（TG2），以控制激光驱动电路（35）。 记录/再现装置可以检测地址标记（81至84），与检测到的地址标记同步地在磁光盘（31）上记录数据信号，并且从磁光盘（31）再现数据信号 与检测到的地址标记进行同步，从而可以可靠地记录/再现数据信号。