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    Apparatus for reproducing information from opto-magnetic record medium
    2.
    发明授权
    Apparatus for reproducing information from opto-magnetic record medium 失效
    用于从光磁记录介质再现信息的装置

    公开(公告)号：US5099470A

    公开(公告)日：1992-03-24

    申请号：US483016

    申请日：1990-02-22

    申请人： Nobuhide Matsubayashi

    发明人： Nobuhide Matsubayashi

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

    CPC分类号： G11B7/1365 ,  G11B11/10545 ,  G11B7/1356

    摘要： In an apparatus for reproducing information recorded in an opto-magnetic record medium, a linearly polarized light beam is made incident upon the record medium, a light beam reflected by the record medium is made incident upon a quarter wavelength plate whose principal axis is inclined with respect to the polarization direction of the incident linearly polarized light beam and is converted into one of elliptically polarized light beams having major axes perpendicular to each other depending upon the direction of magnetization in the record medium. The elliptically polarized light beam is made incident upon a polarization beam splitter for separating major and minor axis components from each other, and the thus separated major and minor axis components are received by first and second photodetectors, respectively. Output signals from the photodetectors are supplied to a differential amplifier to drive a difference therebetween representing a reproduced information signal. The information signal having a high C/N ratio can be reproduced without being influenced by a phase difference caused by the optomagnetic record medium and/or optical elements constituting of an optical system of the apparatus.

    Signal detector for an optical information reproducing apparatus
    3.
    发明授权
    Signal detector for an optical information reproducing apparatus 失效
    用于光信息再现装置的信号检测器

    公开(公告)号：US5598389A

    公开(公告)日：1997-01-28

    申请号：US299699

    申请日：1994-09-01

    申请人： Junichi Nakano ,  Hiroshi Ezawa ,  Nobuhide Matsubayashi

    发明人： Junichi Nakano ,  Hiroshi Ezawa ,  Nobuhide Matsubayashi

    IPC分类号： G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/14 ,  G11B7/00

    CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B20/1426 ,  G11B7/005

    摘要： Write data, which has been modulated in a 4/11 mode and converted in an NRZI mode, is written on a sample servo type optical disk by means of a magnetic head and a laser diode in a pickup. A signal reproducer in an optical disk unit comprises a differentiating circuit for differentiating a reproduced signal originating from data recorded on the optical disk after detected by the pickup, an A/D converter for sampling a differential signal synchronously with a channel clock, and a difference detector for reproducing data by performing difference detection on results of A/D conversion. The difference detector includes a register, a selector, and a determiner.

    摘要翻译： 已经以4/11模式调制并以NRZI模式转换的写入数据通过拾取器中的磁头和激光二极管写入样品伺服型光盘。 光盘单元中的信号再现器包括一个微分电路，用于对由拾取器检测到的源自记录在光盘上的数据的再现信号进行微分，用于与通道时钟同步地采样差分信号的A / D转换器， 检测器，用于通过对A / D转换结果执行差分检测来再现数据。 差分检测器包括寄存器，选择器和确定器。

    Optical disk apparatus with beam energy correction for deviations in inclination
    5.
    发明授权
    Optical disk apparatus with beam energy correction for deviations in inclination 失效
    具有光束能量校正的光盘装置倾斜偏差

    公开(公告)号：US4631712A

    公开(公告)日：1986-12-23

    申请号：US627764

    申请日：1984-07-05

    申请人： Nobuhide Matsubayashi ,  Hideyuki Kenjyo ,  Kiichi Kato ,  Masaharu Sakamoto

    发明人： Nobuhide Matsubayashi ,  Hideyuki Kenjyo ,  Kiichi Kato ,  Masaharu Sakamoto

    IPC分类号： G11B7/09 ,  G11B7/0037 ,  G11B7/095 ,  G11B7/125 ,  G11B7/126

    CPC分类号： G11B7/126 ,  G11B7/0037 ,  G11B7/0956

    摘要： An optical disk apparatus has an optical head. The optical head emits a light beam onto an optical disk and forms pits in the optical disk, thereby recording a signal. A detector detects the relative inclination between the optical head and the optical disk and generates a signal corresponding to this relative inclination. A beam intensity correction circuit corrects the intensity of the light beam in accordance with the relative inclination to form proper pits. In one embodiment, the intensity of the light beam is increased when the relative inclination is increased.

    摘要翻译： 光盘装置具有光头。 光头将光束发射到光盘上并在光盘中形成凹坑，从而记录信号。 检测器检测光头和光盘之间的相对倾斜度并产生对应于该相对倾角的信号。 光束强度校正电路根据相对倾斜度校正光束的强度，形成适当的凹坑。 在一个实施例中，当相对倾斜度增加时，光束的强度增加。

    Photomagnetic differential reproducing system
    6.
    发明授权
    Photomagnetic differential reproducing system 失效
    光磁差分再现系统

    公开(公告)号：US4682311A

    公开(公告)日：1987-07-21

    申请号：US823559

    申请日：1986-01-29

    申请人： Nobuhide Matsubayashi ,  Kiichi Kato

    发明人： Nobuhide Matsubayashi ,  Kiichi Kato

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

    CPC分类号： G11B11/10532

    摘要： A linearly polarized light is projected upon a recording medium of a photomagnetic type; the reflected light is rotated by an appropriate angle through a halfwave plate and split into a reflected light and a transmitted light through a beam splitter having reflection factors of 0 or 100% for p- or s-polarized light in such a way that the beam splitter functions as an analyzer for one of the reflected and transmitted lights. The other of the reflected and transmitted lights is passed through an analyzer. The two lights passed through the beam splitter and the analyzer are detected by two photodetectors separately and applied to a differential amplifier to generate a reproduction signal of high S/N ratio without the use of a half mirror R.sub.p =R.sub.s =50% which is very difficult to manufacture.

    摘要翻译： 线偏振光投影在光磁型记录介质上; 反射光通过半波片旋转适当的角度，并且通过分光镜分离成反射光和透射光，该分束器对于p-偏振光或S偏振光具有0或100％的反射因子，使得光束 分离器用作反射和透射光之一的分析仪。 反射和透射的另一个光通过分析仪。 两个光通过分束器，分析仪分别由两个光电检测器检测，并应用于差分放大器以产生高S / N比的再现信号，而不使用半反射镜Rp = Rs = 50％ 难以制造

    Photomagnetic signal detecting device
    7.
    发明授权
    Photomagnetic signal detecting device 失效
    光磁信号检测装置

    公开(公告)号：US5404490A

    公开(公告)日：1995-04-04

    申请号：US918776

    申请日：1992-07-27

    申请人： Nobuhide Matsubayashi ,  Yoichi Hosaka ,  Ken Sugawara

    发明人： Nobuhide Matsubayashi ,  Yoichi Hosaka ,  Ken Sugawara

    IPC分类号： G11B11/105 ,  G02B5/30 ,  G11B7/00

    CPC分类号： G11B11/10543

    摘要： A photomagnetic signal detecting apparatus, in the reflected light path of a light beam reflected from a recording medium in which information is magnetically recorded, there is provided an optical element having a light beam dividing device transmitting one of two polarized lights intersecting at right angles with each other and reflecting the other polarized light and a light path converting device emitting by reflection or refraction the light beam reflected by this light beam dividing device in substantially the same direction as of the transmitted light transmitted through the above mentioned light beam dividing device so that the transmitted light and reflected light emitted from this optical element may be received by a photodetecting device.

    摘要翻译： 一种光磁信号检测装置，在从记录有信息的记录介质反射的光束的反射光路中，设置有光束分割装置，该光束分割装置将与两个垂直相交的两个偏振光中的一个与 彼此反射并且反射另一个偏振光和光路转换装置，其通过反射或折射由该光束分割装置反射的光束以与透过上述光束分割装置的透射光大致相同的方向发射，从而 从该光学元件发射的透射光和反射光可以由光电检测装置接收。

    Apparatus and method for recording/reproducing magneto-optical information
    10.
    发明授权
    Apparatus and method for recording/reproducing magneto-optical information 失效
    用于记录/再现磁光信息的装置和方法

    公开(公告)号：US06169714A

    公开(公告)日：2001-01-02

    申请号：US09173069

    申请日：1998-10-16

    申请人： Yasuhito Tanaka ,  Masaaki Kurebayashi ,  Takeshi Maeda ,  Hitoshi Watanabe ,  Tetsu Watanabe ,  Shigemi Maeda ,  Satoshi Sumi ,  Nobuhide Matsubayashi ,  Michio Matsuura

    发明人： Yasuhito Tanaka ,  Masaaki Kurebayashi ,  Takeshi Maeda ,  Hitoshi Watanabe ,  Tetsu Watanabe ,  Shigemi Maeda ,  Satoshi Sumi ,  Nobuhide Matsubayashi ,  Michio Matsuura

    IPC分类号： G11B709

    CPC分类号： G11B7/126 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0945 ,  G11B7/0956 ,  G11B11/10515 ,  G11B11/10576 ,  G11B11/10595

    摘要： A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium at least including a first magnetic film having perpendicular magnetic anisotropy, and a second magnetic film to which information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit for receiving the readout laser beam reflected from the second magnetic film of the recording medium, and a subtraction circuit in which output signals of the two detection elements of the 2-split detection circuit are subtracted from each other to generate a differential signal. The apparatus further comprises a circuit for making a spot of the laser beam jump one track before readout of the information from the magneto-optical information recording medium, a positive/negative balance correction circuit for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.

    摘要翻译： 一种磁光信息记录/再现装置，其中至少包括具有垂直磁各向异性的第一磁性膜的磁光信息记录介质和第二磁性膜，通过照射 使用激光束，使得读出的激光束照射到第二磁性膜上，从而读出传递到第二磁性膜的信息。 该装置包括用于接收从记录介质的第二磁性膜反射的读出激光束的二分割检测电路，以及减法电路，其中从每个减去2分割检测电路的两个检测元件的输出信号 另外产生差分信号。 该装置还包括一个电路，用于在从磁光信息记录介质读出信息之前使激光束的点跳跃到一个轨道;正/负平衡校正电路，用于检测正，负振幅之间的振幅比， 响应于轨道跳跃从减法电路产生的差分信号中产生的轨道跳转信号，从而根据振幅比输出校正信号;以及加法电路，用于将校正信号加到差分信号上，从而产生跟踪 用于从磁光信息记录介质读出磁光信息的跟踪控制的误差信号。