公开(公告)号：US06538968B1

公开(公告)日：2003-03-25

申请号：US09284080

申请日：1999-04-07

申请人： Atsushi Yamaguchi ,  Kenji Torazawa ,  Satoshi Sumi ,  Kenji Tanase ,  Yoshihisa Suzuki

发明人： Atsushi Yamaguchi ,  Kenji Torazawa ,  Satoshi Sumi ,  Kenji Tanase ,  Yoshihisa Suzuki

IPC分类号： G11B708

CPC分类号： G11B7/126 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/1365 ,  G11B11/10595

摘要： The present invention provides a recording medium and an information recording/reproducing apparatus which permit recording and/or reproducing by a laser beam of optimized power for each recording medium. The recording medium is provided with a calibration region in addition to an information recording region. The calibration region has wobbles formed such that the amplitude of the waveform of a reproduced signal therefrom can change. Prior to recording to the information recording region, a signal is recorded in the calibration region by changing the laser power, and the recorded signal is immediately reproduced. The waveform of the reproduced signal is evaluated to determine optimum laser power for recording. At the time of reproducing, a signal previously recorded in the calibration region is reproduced while changing the laser power, and laser power optimum for reproducing is determined.

摘要翻译： 本发明提供一种记录介质和信息记录/再现装置，其允许通过每个记录介质的优化功率的激光束进行记录和/或再现。 记录介质除了信息记录区域之外还设置有校准区域。 校准区域具有形成的摆动，使得其再现信号的波形的幅度可以改变。 在记录到信息记录区之前，通过改变激光功率将信号记录在校准区域中，并立即再现所记录的信号。 评估再现信号的波形以确定用于记录的最佳激光功率。 在再现时，在改变激光功率的同时再现先前记录在校准区域中的信号，并且确定用于再现的最佳激光功率。

公开(公告)号：US5771211A

公开(公告)日：1998-06-23

申请号：US639365

申请日：1996-04-26

申请人： Kenji Tanase ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi

发明人： Kenji Tanase ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi

IPC分类号： G11B11/105 ,  G11B11/00

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

摘要： The magneto-optical recording medium, including a transparent polycarbonate substrate, an interference layer made of SiN, a reading layer made of GdFeCo, a recording layer made of TbFeCo, an oxidation-preventing layer made of SiN, a irradiation layer made of Al and an ultraviolet-setting plastic layer, is disclosed. Each layer is deposited to a suitable thickness in the above-named order on the transparent polycarbonate substrate. The composition of each element in the reading layer and the recording layer is set to a suitable value to achieve acceptable characteristics. A high recording and reading density is achieved.

摘要翻译： 包括透明聚碳酸酯基板，由SiN制成的干涉层，由GdFeCo制成的读取层，由TbFeCo制成的记录层，由SiN制成的防氧化层的磁光记录介质，由Al制成的照射层和 紫外线固化塑料层。 每层在透明聚碳酸酯基材上以上述顺序沉积到合适的厚度。 将读取层和记录层中的每个元素的组成设定为合适的值以实现可接受的特性。 实现了高记录和读取密度。

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。

公开(公告)号：US06205092B1

公开(公告)日：2001-03-20

申请号：US08976010

申请日：1997-11-21

申请人： Atsushi Yamaguchi ,  Satoshi Sumi ,  Yoshihisa Suzuki ,  Kenji Tanase

发明人： Atsushi Yamaguchi ,  Satoshi Sumi ,  Yoshihisa Suzuki ,  Kenji Tanase

IPC分类号： G11B1100

CPC分类号： B82Y10/00 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1356 ,  G11B7/1384 ,  G11B7/1387 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10554

摘要： A magneto-optic recording medium reproduction device includes a multi-clad, step index optical fiber, a semiconductor laser arranged on one end surface side of the optical fiber for providing laser beam to one end surface of the optical fiber, a photodetector arranged on one end surface side of the optical fiber and receiving laser beam from one end surface of the optical fiber, and a magnetic head for applying an alternating field to the magneto-optic recording medium. Since the other end surface of the optical fiber is arranged adjacent to the magneto-optic recording medium, an accurate signal can be reproduced even from an extremely small recorded domain. Furthermore, since an alternating field is applied to the magneto-optic recording medium, a domain transferred from a recording layer of the magneto-optic recording medium to a reproducing layer is expanded and a large reproduced signal can be obtained from the expanded domain.

摘要翻译： 一种磁光记录介质再现装置，包括：多包层步进折射率光纤，配置在光纤的一个端面侧的半导体激光器，用于向光纤的一个端面提供激光束;光检测器 并且从光纤的一个端面接收激光束，以及用于向磁光记录介质施加交变场的磁头。 由于光纤的另一个端面被布置成与磁光记录介质相邻，所以即使从非常小的记录域也可以再现准确的信号。 此外，由于将交变场应用于磁光记录介质，从磁光记录介质的记录层转移到再现层的域被扩展，并且可以从扩展域获得大的再现信号。

公开(公告)号：US5796683A

公开(公告)日：1998-08-18

申请号：US823757

申请日：1997-03-25

申请人： Satoshi Sumi ,  Kenji Tanase ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Yoichi Tsuchiya

发明人： Satoshi Sumi ,  Kenji Tanase ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Yoichi Tsuchiya

IPC分类号： G11B11/10 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B7/1365 ,  G11B11/10543

摘要： An information recording and reproduction apparatus for a magnetically induced superresolution magneto-optical recording medium includes an optical head that emits a laser beam to a signal recording plane of the medium and detecting a laser beam reflected therefrom. The optical head includes a polarization plane rotary unit and a polarizing filter between a light source and an objective lens. The polarization plane rotary unit transmits the laser beam while rotating the direction of polarization of the laser beam. The polarizing filter allows the laser beam to be transmitted at the outer portion independent of the direction of polarization, and allows only the laser beam that is polarized in a particular direction to be transmitted at the inner portion. The polarization plane rotary unit is controlled so as to rotate the direction of polarization of the laser beam in a direction different from the particular direction in reproduction. Thus, the optical superresolution method is carried out with the inner portion of the laser beam for radiation blocked only in reproduction.

摘要翻译： 用于磁感应超分辨率磁光记录介质的信息记录和再现装置包括：光头，其将激光束发射到介质的信号记录平面，并检测从其反射的激光束。 光头包括偏振面旋转单元和光源与物镜之间的偏振滤光器。 偏振面旋转单元在旋转激光束的偏振方向的同时透射激光束。 偏振滤光器允许激光束在外部部分与偏振方向无关地传输，并且仅允许在特定方向上被偏振的激光束在内部传播。 控制偏振面旋转单元，以便在再现中沿与特定方向不同的方向旋转激光束的偏振方向。 因此，光学超分辨率方法是用激光束的内部部分进行的，用于仅在再现中阻挡辐射。

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。

公开(公告)号：US06327232B2

公开(公告)日：2001-12-04

申请号：US09828987

申请日：2001-04-10

申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

IPC分类号： G11B7005

CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/126 ,  G11B7/1367 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24 ,  G11B11/10515 ,  G11B11/10545 ,  G11B11/10595 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B27/3027 ,  G11B2220/2525

摘要： An information recording and reproduction apparatus for a magneto-optical medium includes a synchronizing signal generation circuit for generating a synchronizing signal to provide a pulsed laser beam at the time of reproduction according to an internal clock obtained from a reproduction signal. The laser beam is driven on/off according to the synchronizing signal at the time of reproduction to have the laser spot on the signal plane prevented from being enlarged, so that the reproducible domain is smaller than the domain of when a laser beam is continuously emitted. In reproduction, an optical superresolution method is applied simultaneous to provision of a pulsed laser beam to allow reproduction of higher density. An external synchronizing signal generation circuit for generating an external synchronizing signal according to a wobble on a surface of a recording medium can be used instead of a synchronizing signal generation circuit according to an internal clock.

公开(公告)号：US06324137B2

公开(公告)日：2001-11-27

申请号：US09828935

申请日：2001-04-10

申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

IPC分类号： G11B7005

CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/126 ,  G11B7/1367 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24 ,  G11B11/10515 ,  G11B11/10545 ,  G11B11/10595 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B27/3027 ,  G11B2220/2525

摘要： An information recording and reproduction apparatus for a magneto-optical medium includes a synchronizing signal generation circuit for generating a synchronizing signal to provide a pulsed laser beam at the time of reproduction according to an internal clock obtained from a reproduction signal. The laser beam is driven on/off according to the synchronizing signal at the time of reproduction to have the laser spot on the signal plane prevented from being enlarged, so that the reproducible domain is smaller than the domain of when a laser beam is continuously emitted. In reproduction, an optical superresolution method is applied simultaneous to provision of a pulsed laser beam to allow reproduction of higher density. An external synchronizing signal generation circuit for generating an external synchronizing signal according to a wobble on a surface of a recording medium can be used instead of a synchronizing signal generation circuit according to an internal clock.

公开(公告)号：US06314070B1

公开(公告)日：2001-11-06

申请号：US09828982

申请日：2001-04-10

申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

IPC分类号： G11B7125

CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/126 ,  G11B7/1367 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24 ,  G11B11/10515 ,  G11B11/10545 ,  G11B11/10595 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B27/3027 ,  G11B2220/2525

摘要： An information recording and reproduction apparatus for a magneto-optical medium includes a synchronizing signal generation circuit for generating a synchronizing signal to provide a pulsed laser beam at the time of reproduction according to an internal clock obtained from a reproduction signal. The laser beam is driven on/off according to the synchronizing signal at the time of reproduction to have the laser spot on the signal plane prevented from being enlarged, so that the reproducible domain is smaller than the domain of when a laser beam is continuously emitted. In reproduction, an optical superresolution method is applied simultaneous to provision of a pulsed laser beam to allow reproduction of higher density. An external synchronizing signal generation circuit for generating an external synchronizing signal according to a wobble on a surface of a recording medium can be used instead of a synchronizing signal generation circuit according to an internal clock.

公开(公告)号：US06240056B1

公开(公告)日：2001-05-29

申请号：US08861791

申请日：1997-05-22

申请人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

发明人： Kenji Tanase ,  Atsushi Yamaguchi ,  Kenji Nakao ,  Hisashi Matsuyama ,  Yoshihiro Hori ,  Satoshi Sumi

IPC分类号： G11B7005

CPC分类号： B82Y10/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/126 ,  G11B7/1367 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24 ,  G11B11/10515 ,  G11B11/10545 ,  G11B11/10595 ,  G11B20/1403 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B27/3027 ,  G11B2220/2525

摘要： An information recording and reproduction apparatus for a magneto-optical medium includes a synchronizing signal generation circuit for generating a synchronizing signal to provide a pulsed laser beam at the time of reproduction according to an internal clock obtained from a reproduction signal. The laser beam is driven on/off according to the synchronizing signal at the time of reproduction to have the laser spot on the signal plane prevented from being enlarged, so that the reproducible domain is smaller than the domain of when a laser beam is continuously emitted. In reproduction, an optical superresolution method is applied simultaneous to provision of a pulsed laser beam to allow reproduction of higher density. An external synchronizing signal generation circuit for generating an external synchronizing signal according to a wobble on a surface of a recording medium can be used instead of a synchronizing signal generation circuit according to an internal clock.

摘要翻译： 用于磁光介质的信息记录和再现装置包括：同步信号产生电路，用于产生同步信号，以根据从再现信号获得的内部时钟在再现时提供脉冲激光束。 根据再现时的同步信号，激光束被驱动开/关，防止信号面上的激光点被放大，使得可再现域小于激光束连续发射的范围 。 在再现中，光学超分辨率方法同时应用于提供脉冲激光束以允许再现更高密度。 可以使用根据内部时钟的同步信号生成电路来代替根据记录介质的表面上的摆动产生外部同步信号的外部同步信号生成电路。