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    Optical pickup device having compatibility with tracking system, and optical disk recording/reproduction apparatus using the same
    3.
    发明授权
    Optical pickup device having compatibility with tracking system, and optical disk recording/reproduction apparatus using the same 失效
    具有与跟踪系统兼容的光学拾取装置，以及使用其的光盘记录/再现装置

    公开(公告)号：US06385158B1

    公开(公告)日：2002-05-07

    申请号：US09168880

    申请日：1998-10-09

    申请人： Naoyuki Takagi ,  Satoshi Sumi

    发明人： Naoyuki Takagi ,  Satoshi Sumi

    IPC分类号： G11B700

    CPC分类号： G11B7/1369 ,  G11B7/0903 ,  G11B7/0906 ,  G11B7/0943 ,  G11B7/1275 ,  G11B7/131 ,  G11B7/1353 ,  G11B11/10543 ,  G11B11/10576 ,  G11B11/10597 ,  G11B2007/0006

    摘要： An optical pickup device for an AS-MO disk, a DVD and a CD includes a dual wavelength semiconductor laser with first and second oscillation devices, a polarization plane rotary unit selectively rotating a plane of polarization of a laser beam 90°, and a polarization selective diffraction grating passing a laser beam straight forward or dividing a laser beam into three beams depending upon the direction of polarization. The optical pickup device operates by the DPP tracking system where three laser beams are directed for an AS-MO disk, and by the DPD tracking system where a single laser beam is directed for a DVD or a CD. As a result, a signal can be reproduced from an AS-MO disk, a DVD, or a CD having different tracking systems.

    摘要翻译： 用于AS-MO盘，DVD和CD的光学拾取装置包括具有第一和第二振荡装置的双波长半导体激光器，选择性地将激光束的偏振面旋转90°的偏振面旋转单元和偏振 选择性衍射光栅将激光束直接向前传播或根据偏振方向将激光束分成三束。 光学拾取装置由DPP跟踪系统操作，其中三个激光束被引导用于AS-MO盘，以及DPD跟踪系统，其中单个激光束被定向用于DVD或CD。 结果，可以从具有不同跟踪系统的AS-MO盘，DVD或CD再现信号。

    Method and apparatus for recording with a magneto-optical recording medium applying one period of an alternating magnetic field to a unit domain length
    4.
    发明授权
    Method and apparatus for recording with a magneto-optical recording medium applying one period of an alternating magnetic field to a unit domain length 失效
    用磁光记录介质进行记录的方法和装置，其将一个交变磁场的周期应用于单位域长度

    公开(公告)号：US06501707B1

    公开(公告)日：2002-12-31

    申请号：US09233917

    申请日：1999-01-21

    申请人： Atsushi Yamaguchi ,  Naoyuki Takagi

    发明人： Atsushi Yamaguchi ,  Naoyuki Takagi

    IPC分类号： G11B1100

    CPC分类号： G11B11/10528 ,  G11B11/10513 ,  G11B11/10515 ,  G11B20/1426

    摘要： A magneto-optical recording medium includes a recording layer and a reproducing layer respectively formed by magnetic layers on a substrate. A record magnetic domain is formed within the recording layer by using a magnetic head, which is transferred into a reproducing layer by irradiating a laser beam upon reproduction. The physical length in recording a unit bit is taken as a unit domain length. Where the unit domain length is 1T and “1” is recorded in 1T, “1” is recorded in a former half 1T/2 and “0” is in a latter half 1T/2 by applying one period of an alternating magnetic field to the unit domain length.

    摘要翻译： 磁光记录介质包括分别由衬底上的磁性层形成的记录层和再现层。 通过使用磁头在记录层内形成记录磁畴，磁头通过在再现时照射激光而被转印到再现层中。 记录单位位的物理长度作为单位域长度。 在单位域长度为1T且在1T中记录为“1”的情况下，在前半部1T / 2中记录“1”，在后半部1T / 2中记录“0”，通过将一个交变磁场周期 单位域长度。

    Magneto-optical disk apparatus capable of accurately enlarging and reproducing a magnetic domain and method of reproducing the same
    6.
    发明授权
    Magneto-optical disk apparatus capable of accurately enlarging and reproducing a magnetic domain and method of reproducing the same 有权
    能够精确地放大和再现磁畴的磁光盘装置及其再现方法

    公开(公告)号：US06483783B1

    公开(公告)日：2002-11-19

    申请号：US09713034

    申请日：2000-11-16

    申请人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Hiroki Ishida ,  Atsushi Yamaguchi ,  Morio Nakatani

    发明人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Hiroki Ishida ,  Atsushi Yamaguchi ,  Morio Nakatani

    IPC分类号： G11B1100

    CPC分类号： G11B11/10595 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/1055

    摘要： A magnetic head is configured of a core and a coil wound around the core and passing current through the coil in a variable direction allows the core to have an edge generating an alternating magnetic field Hex1 and another edge generating an alternating magnetic field Hex2. Alternating magnetic fields Hex1 and Hex2 are applied to the respective edges. Furthermore, a laser beam LB1 is directed such that its optical axis L01 matches the edge receiving the alternating magnetic field Hex1, and a laser beam LB2 is directed such that its optical axis L02 matches the edge receiving the alternating magnetic field Hex2. A first magneto-optical signal detected through the alternating magnetic field Hex1 and the laser beam LB1 and a second magneto-optical signal detected through the alternating magnetic field Hex2 and the laser beam LB2 are composited together. As such, an alternating magnetic field can be applied to a magneto-optical recording medium at a predetermined angle to an in-plane direction of the recording medium to accurately enlarge a magnetic domains for reproduction.

    摘要翻译： 磁头由铁芯和缠绕在磁芯上的线圈构成，并且使电流沿可变方向通过线圈允许磁芯具有产生交变磁场Hex1的边缘，另一边产生交变磁场Hex2。 交替磁场Hex1和Hex2被施加到相应的边缘。 此外，激光束LB1被引导为使得其光轴L01与接收交变磁场Hex1的边缘匹配，并且激光束LB2被引导为使得其光轴L02与接收交变磁场Hex2的边缘匹配。 通过交变磁场Hex1和激光束LB1检测到的第一磁光信号和通过交变磁场Hex2和激光束LB2检测的第二磁光信号被合成在一起。 这样，可以将交变磁场以与记录介质的面内方向成预定角度的方式施加到磁光记录介质，以精确地放大用于再现的磁畴。

    Apparatus and method for reproducing information from a magneto optical recording medium by the magnetic domain magnification method
    7.
    发明授权
    Apparatus and method for reproducing information from a magneto optical recording medium by the magnetic domain magnification method 有权
    通过磁畴放大法从磁光记录介质再现信息的装置和方法

    公开(公告)号：US06418088B1

    公开(公告)日：2002-07-09

    申请号：US09367934

    申请日：1999-08-24

    申请人： Naoyuki Takagi ,  Atsushi Yamaguchi

    发明人： Naoyuki Takagi ,  Atsushi Yamaguchi

    IPC分类号： G11B1100

    CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B11/10595

    摘要： A laser beam is directed from an optical head (40) while an alternating magnetic field is applied from a magnetic head (52). A reproduced signal from the optical head (40) is input to a reproduced signal detecting circuit (45) through a reproduced signal amplifying circuit (41). The detected signal (CK) of discontinuous regions provided at prescribed intervals in the groove of a magneto-optical recording medium (1) is input to an external synchronous signal generating circuit (46) and, in response, an external synchronous signal (SYN) is generated. In synchronization with the external synchronous signal (SYN), the reproduced signal detecting circuit (45) calculates a difference between the reproduced signal generated when a magnetic field for magnetic domain magnification is applied and the reproduced signal generated when a magnetic field for magnetic domain erasure is applied. The difference is detected as a reproduced signal (RF). Accordingly, low frequency “winding” included in the reproduced signal from the optical head (40) is offset, resulting in a correct reproduced signal (RF).

    摘要翻译： 从磁头（40）引导激光束，同时从磁头（52）施加交变磁场。 来自光头（40）的再现信号通过再生信号放大电路（41）输入再生信号检测电路（45）。 在磁光记录介质（1）的凹槽中以规定间隔设置的不连续区域的检测信号（CK）被输入到外部同步信号发生电路（46），作为响应，外部同步信号（SYN） 被生成。 与外部同步信号（SYN）同步，再现信号检测电路（45）计算当施加磁场倍率的磁场时产生的再生信号与磁场擦除磁场产生的再生信号之间的差值 被申请;被应用。 该差被检测为再生信号（RF）。 因此，包含在来自光头（40）的再现信号中的低频“绕组”偏移，导致正确的再现信号（RF）。

    Method and apparatus for recording with a magneto-optical recording medium
    8.
    发明授权
    Method and apparatus for recording with a magneto-optical recording medium 有权
    用磁光记录介质记录的方法和装置

    公开(公告)号：US06697304B2

    公开(公告)日：2004-02-24

    申请号：US10247691

    申请日：2002-09-20

    申请人： Atsushi Yamaguchi ,  Naoyuki Takagi

    发明人： Atsushi Yamaguchi ,  Naoyuki Takagi

    IPC分类号： G11B1100

    CPC分类号： G11B11/10528 ,  G11B11/10513 ,  G11B11/10515 ,  G11B20/1426

    摘要： A magneto-optical recording medium includes a recording layer and a reproducing layer respectively formed by magnetic layers on a substrate. A record magnetic domain is formed within the recording layer by using a magnetic head, which is transferred into a reproducing layer by irradiating a laser beam upon reproduction. The physical length in recording a unit bit is taken as a unit domain length. Where the unit domain length is 1T and “1” is recorded in 1T, “1” is recorded in a former half 1T/2 and “0” is in a latter half 1T/2 by applying one period of an alternating magnetic field to the unit domain length.

    摘要翻译： 磁光记录介质包括分别由衬底上的磁性层形成的记录层和再现层。 通过使用磁头在记录层内形成记录磁畴，磁头通过在再现时照射激光而被转印到再现层中。 记录单位位的物理长度作为单位域长度。 在单位域长度为1T且在1T中记录为“1”的情况下，在前半部1T / 2中记录“1”，在后半部1T / 2中记录“0”，通过将一个交变磁场周期 单位域长度。

    Reproducing method for magneto-optic recording medium, and magneto-optic disk device
    9.
    发明授权
    Reproducing method for magneto-optic recording medium, and magneto-optic disk device 失效
    磁光记录介质的再现方法和磁光盘装置

    公开(公告)号：US06388955B1

    公开(公告)日：2002-05-14

    申请号：US09381498

    申请日：1999-09-22

    申请人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

    发明人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

    IPC分类号： G11B1100

    CPC分类号： G11B7/126 ,  G11B11/10515 ,  G11B11/10595

    摘要： A reproducing apparatus reproduces a signal recorded in a magneto-optical disk. The magneto-optical disk includes a layered structure having a recording layer, an intermediate layer and a reproducing layer. Laser light is illuminated from an optical head to the magneto-optical disk in such an intensity that no magnetic domain is transferred from the recording layer to the reproducing layer only by the laser light. In this state, alternating magnetic field is applied through a magnetic head to the magneto-optical disk, thereby concurrently causing transfer and expansion of a magnetic domain to the reproducing layer. As a result, transfer of the magnetic domain is effected with expansion.

    摘要翻译： 再现装置再现记录在磁光盘中的信号。 磁光盘包括具有记录层，中间层和再现层的分层结构。 激光从光头照射到磁 - 光盘，其强度使得只有通过激光将磁畴从记录层转移到再现层。 在这种状态下，通过磁头向磁光盘施加交变磁场，从而同时引起磁畴向再现层的转移和扩展。 结果，扩大了磁畴的转移。

    Magnetooptical disk unit capable of recording or reproducing signals having different domain lengths under the same conditions, signal recording method and signal reproducing method
    10.
    发明授权
    Magnetooptical disk unit capable of recording or reproducing signals having different domain lengths under the same conditions, signal recording method and signal reproducing method 失效
    能够在相同条件下记录或再现具有不同域长度的信号的磁光盘单元，信号记录方法和信号再现方法

    公开(公告)号：US06295253B1

    公开(公告)日：2001-09-25

    申请号：US09666549

    申请日：2000-09-21

    申请人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Atsushi Yamaguchi ,  Hiroki Ishida

    发明人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Atsushi Yamaguchi ,  Hiroki Ishida

    IPC分类号： G11B1100

    CPC分类号： G11B20/10 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10534 ,  G11B11/1055 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/2525

    摘要： When recording a recorded signal consisting of “01011001110” in a magnetooptical recording medium, (1,1) corresponding to a domain of 2T is converted to (1,0,1), and (0,0) is converted to (0,1,0) in the recorded signal. In other words, the first “1” of (1,1) is converted to unit bits “1,0” and the first “0” of (0,0) is converted to unit bits “0,1”. Similarly, the first “1” of (1,1,1) corresponding to a domain of 3T is converted to unit bits “1,0”, and the second “1” is converted to unit bits “1,0”. “1” or “0” of the final unit bit is not converted but recorded as such. Consequently, a signal can be correctly reproduced by extension ally transferring domains having different domain lengths from a recording layer to a reproducing layer under the same reproducing conditions.

    摘要翻译： 当在磁光记录介质中记录由“01011001110”组成的记录信号时，对应于2T的域的（1,1）被转换为（1,0,1），（0,0）被转换为（0， 1,0）记录信号。 换句话说，（1,1）的第一个“1”被转换为单位比特“1,0”，（0,0）的第一个“0”被转换为单位比特“0,1”。 类似地，对应于3T的域的（1,1,1）的第一“1”被转换为单位比特“1,0”，第二“1”被转换为单位比特“1,0”。 最终单位位的“1”或“0”不转换而是被记录。 因此，通过在相同的再现条件下将具有不同域长度的域从记录层延伸到再现层，可以正确地再现信号。