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    Device for optically tracking information
    1.
    发明授权
    Device for optically tracking information 失效
    用于光学跟踪信息的设备

    公开(公告)号：US4541082A

    公开(公告)日：1985-09-10

    申请号：US443033

    申请日：1982-11-19

    申请人： Tatsuo Horikoshi ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Hiroshi Tooyama ,  Masatoshi Otake

    发明人： Tatsuo Horikoshi ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Hiroshi Tooyama ,  Masatoshi Otake

    IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B21/10

    CPC分类号： G11B7/0901

    摘要： A device for optically tracking information recorded on an optical disc wherein a photodetector is disposed on the optical axis of an optical system for guiding diffracted waves to the photodetector. The origin of a fictitious X-Y coordinate system at the photodetector is placed on the above-mentioned optical axis, X- and Y-axes of the coordinate system are made parallel to and perpendicular to an information track having the information pits on the rotating recording medium, and the photodetector is divided into four equal parts. A first summation signal indicating the sum of output signals from the four parts of the photodetector is converted into a binary signal, and a difference signal between second summation signals each indicating the sum of output signals from a pair of photodetector parts facing each other with the origin of the coordinate system therebetween is converted into another binary signal. A signal indicating a direction in which the light beam deviates from the information track, is formed on the basis of the above-mentioned binary signals, and a tracking signal indicating the deviation of the light beam from the information track is formed by full-wave rectifying the difference signal and modifying the rectified signal with the above-mentioned direction indicating signal.

    摘要翻译： 一种用于光学跟踪记录在光盘上的信息的装置，其中光电检测器设置在用于将衍射波引导到光电检测器的光学系统的光轴上。 将光电检测器上的虚拟XY坐标系的原点置于上述光轴上，坐标系的X轴和Y轴平行于和垂直于在旋转记录介质上具有信息凹坑的信息轨道 ，并且光电检测器被分成四等份。 指示来自光电检测器的四个部分的输出信号之和的第一求和信号被转换为二进制信号，以及第二求和信号之间的差分信号，每个信号表示来自一对彼此面对的光检测器部分的输出信号之和， 其间的坐标系的原点被转换为另一个二进制信号。 基于上述二进制信号形成指示光束偏离信息轨道的方向的信号，并且指示光束与信息轨道的偏离的跟踪信号由全波形成 整流差分信号，并用上述方向指示信号修正整流信号。

    Optical information tracking apparatus
    2.
    发明授权
    Optical information tracking apparatus 失效
    光信息跟踪装置

    公开(公告)号：US4504937A

    公开(公告)日：1985-03-12

    申请号：US454489

    申请日：1982-12-29

    申请人： Seiji Yonezawa ,  Tatsuo Horikoshi ,  Toshiaki Tsuyoshi

    发明人： Seiji Yonezawa ,  Tatsuo Horikoshi ,  Toshiaki Tsuyoshi

    IPC分类号： G11B7/09 ,  G11B7/12 ,  H04N5/76 ,  G11B7/00

    CPC分类号： G11B7/0901 ,  G11B7/12

    摘要： An optical information tracking apparatus for reproducing information by applying light beam onto a track on a rotating record medium, sensing the diffracted light beam thus generated by means of a photodetector and transforming the diffracted light beam into electrical signals, wherein the origin of said photodetector is aligned with the light axis of the optical system, the X axis is placed in parallel with the direction of said track, the Y axis is placed perpendicular to said track. Electrical signals are taken out respectively from photodetector elements which exist respectively in the first, second, third and fourth quadrants. A difference signal representing the difference between a signal which is the sum of the output signal from the first quadrant and that from the third quadrant and a signal which is the sum of the output signal from the second quadrant and that from the fourth quadrant as well as a sum signal representing the sum of output signals from the first to fourth quadrants are calculated. The positive peak value and the negative peak value of said difference signal are held respectively in peak hold circuits, and occurrences of a positive peak and a negative peak of said sum signal fed from the quadrant photodetector are detected to reset said peak hold circuits when a peak of said sum signal having either positive or negative polarity occurs and to effect sample and hold function for a signal which represents the sum of outputs from said peak hold circuits when a peak of said sum signal having the polarity opposite to said polarity occurs so as to obtain the tracking signal.

    摘要翻译： 一种光学信息跟踪装置，用于通过将光束施加到旋转记录介质上的轨道上来再现信息，感测由光电检测器产生的衍射光束，并将衍射光束变换成电信号，其中所述光电探测器的原点是 与光学系统的光轴对准，X轴与所述轨道的方向平行放置，Y轴垂直于所述轨道放置。 电信号分别从存在于第一，第二，第三和第四象限中的光检测元件取出。 表示作为来自第一象限的输出信号与来自第三象限的输出信号之和的信号与来自第二象限的输出信号之和的信号之差的差分信号以及来自第四象限的信号 作为表示来自第一至第四象限的输出信号之和的和信号。 所述差分信号的正峰值和负峰值分别保持在峰值保持电路中，并且检测从四分之一光电检测器馈送的所述和信号的正峰值和负峰值的出现，以便当所述峰值保持电路 发生具有正极性或负极性的所述和信号的峰值，并且对于表示与所述极性相反极性的所述和信号的峰值发生时表示来自所述峰值保持电路的输出的和的信号，实现采样和保持功能， 以获得跟踪信号。

    Light spot position control system and method by sampled servo
    6.
    发明授权
    Light spot position control system and method by sampled servo 失效
    光点位置控制系统及采样伺服方式

    公开(公告)号：US4872152A

    公开(公告)日：1989-10-03

    申请号：US131643

    申请日：1987-12-11

    申请人： Toshiaki Tsuyoshi ,  Masatoshi Ohtake ,  Wasao Takasugi ,  Seiji Yonezawa

    发明人： Toshiaki Tsuyoshi ,  Masatoshi Ohtake ,  Wasao Takasugi ,  Seiji Yonezawa

    IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B21/10

    CPC分类号： G11B7/0906

    摘要： In a light spot position control system and method in which a control of the irradiation position of a light spot such as a focusing control, a jitter correction and/or a tracking control is made through a sampling control, a newly sampled error value is compared with a one-preceding sampled value. When a difference between both the values is within a range of a predetermined width, the newly sampled value is used as a new sample value as it is. When the difference exceeds the range of the predetermined width, a sum of the one-preceding sampled value and the predetermined width is used as a new sample value. Thereby, the influence of erroneous samples is reduced.

    摘要翻译： 在通过采样控制进行聚焦控制，抖动校正和/或跟踪控制等光点的照射位置的控制的光点位置控制系统和方法中，对新采样的误差值进行比较 具有一个先前的采样值。 当两个值之间的差在预定宽度的范围内时，新采样的值被原样用作新的采样值。 当差超过预定宽度的范围时，将一次取样值与预定宽度的和用作新的样本值。 从而减少错误样品的影响。

    Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset
    7.
    发明授权
    Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset 失效
    具有轨道偏移校正和旋转光盘的复合跟踪伺服系统的方法和装置，其具有用于校正轨道偏移的至少一个校正标记

    公开(公告)号：US4748609A

    公开(公告)日：1988-05-31

    申请号：US845340

    申请日：1986-03-28

    申请人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    发明人： Seiji Yonezawa ,  Masatoshi Ohtake ,  Masaru Ito ,  Toshiaki Tsuyoshi ,  Kazuo Ichino ,  Harushige Nakagaki

    IPC分类号： G11B7/013 ,  G11B7/09 ,  G11B7/095 ,  G11B7/24

    CPC分类号： G11B7/24085 ,  G11B7/094 ,  G11B7/0948 ,  G11B7/0956 ,  G11B7/0901 ,  G11B7/0904

    摘要： A composite wobbled tracking servo system uses a rotary optical disc which has a header field and a data field alternately arranged along the direction of rotation to provide a sector, and which includes pregrooves formed in at least the data field and at least one pair of wobbled track marks disposed in the header field in a relation wobbled relative to the center of a track. A light spot is directed toward and onto the optical disc to detect a push-pull tracking error signal from the reflection of the light spot diffracted by the pregroove, and a wobbled tracking error signal is detected from the reflection of the light spot traversing the wobbled track marks. The push-pull tracking error signal is corrected on the basis of the wobbled tracking error signal to attain the tracking control with higher accuracy, thereby eliminating an undesirable track offset attributable to tilting or eccentricity of the optical disc.

    摘要翻译： 复合摆动跟踪伺服系统使用旋转光盘，其具有沿着旋转方向交替布置的报头字段和数据字段以提供扇区，并且其包括形成在至少数据字段中的预槽和至少一对摆动的 轨道标记以相对于轨道的中心摆动的关系设置在头部区域中。 光点指向光盘，以从由预制槽衍射的光点的反射检测推挽跟踪误差信号，并且从穿过波动的光点的反射中检测摆动的跟踪误差信号 轨迹 基于摆动的跟踪误差信号校正推挽跟踪误差信号，以更高的精度实现跟踪控制，从而消除由于光盘的倾斜或偏心引起的不期望的轨迹偏移。

    Information recording medium with clock information therein
    8.
    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。

    Light spot position control system and method by sampling servo
    9.
    发明授权
    Light spot position control system and method by sampling servo 失效
    光点位置控制系统和采样伺服方法

    公开(公告)号：US4785442A

    公开(公告)日：1988-11-15

    申请号：US072095

    申请日：1987-07-10

    申请人： Masatoshi Ohtake ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Wasao Takasugi ,  Takashi Takeuchi

    发明人： Masatoshi Ohtake ,  Seiji Yonezawa ,  Toshiaki Tsuyoshi ,  Wasao Takasugi ,  Takashi Takeuchi

    IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/095 ,  G11B7/00 ,  G11B21/10

    CPC分类号： G11B7/09

    摘要： A light spot position control system of the invention uses an optical disc in which a servo area and a data area are alternately formed along a rotating direction of a rotary recording medium, wherein error signals obtained from the servo areas are sampled, the latest sample value is compared with at least one-preceding sample value, a check is made to see if the latest sample value is correct or incorrect, and when the latest sample value is decided to be incorrect, the preceding error signal held is directly used as a light spot position control signal without updating the current error signal holding value.

    摘要翻译： 本发明的光点位置控制系统使用其中伺服区域和数据区域沿着旋转记录介质的旋转方向交替形成的光盘，其中从伺服区域获得的误差信号被采样，最新采样值 与至少一个以前的采样值进行比较，进行检查以查看最新采样值是否正确或不正确，并且当最新采样值被确定为不正确时，所保持的前一个误差信号直接用作光 点位置控制信号，而不更新当前误差信号保持值。