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49 条记录 (耗时 0.031 秒)

    Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor
    12.
    发明授权
    Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor 失效
    使用具有V形导向槽和预定光学深度的光盘的光存储装置及其访问方法

    公开(公告)号：US4835756A

    公开(公告)日：1989-05-30

    申请号：US32506

    申请日：1987-03-31

    申请人： Toshimitsu Kaku ,  Takeshi Maeda ,  Shigeru Nakamura ,  Masaru Ito ,  Kazuo Shigematsu ,  Yoshito Tsunoda

    发明人： Toshimitsu Kaku ,  Takeshi Maeda ,  Shigeru Nakamura ,  Masaru Ito ,  Kazuo Shigematsu ,  Yoshito Tsunoda

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/24

    CPC分类号： G11B7/0938 ,  G11B7/08505 ,  G11B7/24079 ,  G11B7/24076

    摘要： An optical memory apparatus employs an optical disc having a plurality of guide-grooves in spiral and concentrical form and a plurality of flat tracks each arranged between adjacent two of the guide-grooves for recording information thereon, and the depth of the guide-grooves is suitably selected to increase the degree of modulation of a track cross signal, thereby performing a stable cross track counting by the use of the track cross signal and a tracking signal. One feature of the invention relies in that the modulation degree of the track cross signal is in the range between 30 and 60%. A second feature of the invention is that the guide-grooves are formed into a V shape and have an optical depth of .lambda./6 to .lambda./5 (.lambda. is the wavelength of the light used). In accordance with the invention, not ony a stable cross track counting is realized, but also the tracking signal is not practically varied with variations in the depth of the guide-grooves, thereby ensuring a highly accurate and stable tracking control.

    摘要翻译： 一种光存储装置采用具有多个螺旋形和同心形状的导向槽的光盘，以及多个平行轨道，每个平行轨迹布置在相邻的两个导槽之间，用于在其上记录信息，并且导向槽的深度为 适当地选择以增加轨道交叉信号的调制度，从而通过使用轨道交叉信号和跟踪信号执行稳定的交叉轨道计数。 本发明的一个特征在于，轨道交叉信号的调制度在30％与60％之间。 本发明的第二个特征是导槽形成为V形，并且具有λ/ 6至λ/ 5的光学深度（λ是所用光的波长）。 根据本发明，不能实现稳定的交叉轨道计数，而且跟踪信号实际上不随着导槽深度的变化而变化，从而确保高精度和稳定的跟踪控制。

    Autofocusing control system
    14.
    发明授权
    Autofocusing control system 失效
    自动对焦控制系统

    公开(公告)号：US4725721A

    公开(公告)日：1988-02-16

    申请号：US766271

    申请日：1985-08-16

    申请人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Takeshi Maeda

    发明人： Shigeru Nakamura ,  Yoshito Tsunoda ,  Takeshi Maeda

    IPC分类号： G02B7/28 ,  G11B7/085 ,  G11B7/09 ,  G11B7/135 ,  G11B7/1374 ,  G11B7/1381

    CPC分类号： G11B7/1381 ,  G11B7/08547 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/1374

    摘要： An autofocusing control system makes a position of focusing spot follow for itself a displacement of an information medium. In the autofocusing control system, a single mode semiconductor laser is excited in a multi oscillation mode by returning part of a reflected light beam from the information medium, and a focusing lens having chromatic aberration is used which focuses a laser beam from the semiconductor laser onto a different position along the optical axis of the lens in association with a different laser wavelength.

    摘要翻译： 自动对焦控制系统使得聚焦点的位置本身跟随信息介质的位移。 在自动对焦控制系统中，通过使来自信息介质的一部分反射光束返回到多重振荡模式中，单模半导体激光器被激发，并且使用具有色差的聚焦透镜，其将来自半导体激光器的激光束聚焦到 与不同激光波长相关联的沿着透镜的光轴的不同位置。

    Optical information recording and reproducing apparatus
    15.
    发明授权
    Optical information recording and reproducing apparatus 失效
    光信息记录和再现装置

    公开(公告)号：US4656618A

    公开(公告)日：1987-04-07

    申请号：US639004

    申请日：1984-08-09

    申请人： Toshimitsu Kaku ,  Keiji Kataoka ,  Yoshito Tsunoda ,  Kazuo Shigematsu

    发明人： Toshimitsu Kaku ,  Keiji Kataoka ,  Yoshito Tsunoda ,  Kazuo Shigematsu

    IPC分类号： G11B7/004 ,  G11B7/09 ,  G11B7/12 ,  G11B7/125 ,  G11B27/36

    CPC分类号： G11B27/36 ,  G11B7/004 ,  G11B7/12 ,  G11B7/128 ,  G11B7/0909

    摘要： In an optical information recording and reproducing apparatus having a laser light source and an optical system so that a beam from the laser light source is irradiated through the optical system on an information recording medium to record and reproduce information, an accousto-optic modulator is disposed in the optical system for receiving the beam from the laser light source, and a modulation unit is provided which comprises an oscillator for generating a plurality of signals at different frequencies, a modulator for modulating the outputs of the oscillator and an adder for adding together the outputs of the modulator.

    摘要翻译： 在具有激光光源和光学系统的光学信息记录和再现装置中，使得来自激光光源的光束通过光学系统照射在信息记录介质上以记录和再现信息，设置声光调制器 在用于从激光光源接收光束的光学系统中，提供了一种调制单元，其包括用于产生不同频率的多个信号的振荡器，用于调制振荡器的输出的调制器和用于将 调制器的输出。

    Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus
    19.
    发明授权
    Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus 失效
    具有校正图案和主盘切割装置的光盘存储器的装置和记录载体

    公开(公告)号：US4949331A

    公开(公告)日：1990-08-14

    申请号：US875442

    申请日：1986-06-17

    申请人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

    发明人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

    IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/26 ,  G11B11/105

    CPC分类号： G11B7/261 ,  G11B11/10565 ,  G11B11/10578 ,  G11B11/10582 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/094 ,  G11B7/24082

    摘要： A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals. The second tracking error signal detected from the pit pattern is not affected by the tilting of the record carrier and the movement of the light spot. When a tracking signal obtained by adding the first and second tracking error signals to each other, is used in a closed-loop tracking system, a stable tracking operation can be performed. The polarity of the pit pattern is reversed on every track, and hence a polarity pit having a depth of .lambda./4 (where .lambda. indicates the wavelength of a reproducing light beam) is provided in the record carrier, to reverse the polarity of the second tracking signal on every track on the basis of a signal from the polarity pit.

    摘要翻译： 公开了一种具有盘形基板和用于在其中光学地写入信息的记录层的记录载体，其包括沿着记录载体的旋转方向延伸的引导槽，使得引导槽的多个转动彼此间隔开 在记录载体的径向方向上设置的凹坑图案，以及设置在相邻引导槽之间的位置，在沿上述旋转方向间隔设置的位置处，用于检测光点与相邻引导槽之间的中心线的偏离。 该记录载体的记录/再现操作以从导槽的衍射光检测第一跟踪误差信号，从凹坑图案检测第二跟踪误差信号并将信息记录并再现 在使用第一和第二跟踪误差信号执行跟踪操作的状态下从形成在相邻引导槽之间的区域。 从凹坑图案检测到的第二跟踪误差信号不受记录载体的倾斜和光点的移动的影响。 当在闭环跟踪系统中使用通过将第一和第二跟踪误差信号彼此相加而获得的跟踪信号时，可以执行稳定的跟踪操作。 凹坑图案的极性在每个轨道上反转，因此在记录载体中提供具有λ/ 4深度（其中λ表示再现光束的波长）的极性凹坑，以反转第二 基于来自极性凹坑的信号在每个轨道上跟踪信号。

    Magneto-optic memory apparatus with defect detection of recording medium during erasing operation
    20.
    发明授权
    Magneto-optic memory apparatus with defect detection of recording medium during erasing operation 失效
    在擦除操作期间具有记录介质的缺陷检测的磁光存储装置

    公开(公告)号：US4879703A

    公开(公告)日：1989-11-07

    申请号：US71178

    申请日：1987-07-08

    申请人： Toshimitsu Kaku ,  Yoshito Tsunoda ,  Kazuo Shigematsu

    发明人： Toshimitsu Kaku ,  Yoshito Tsunoda ,  Kazuo Shigematsu

    IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B19/02 ,  G11B20/18 ,  G11B27/36

    CPC分类号： G11B20/1883 ,  G11B11/105 ,  G11B11/10517 ,  G11B11/10595 ,  G11B19/02 ,  G11B27/36

    摘要： A magneto-optic memory apparatus is disclosed in which a laser beam is focused on a recording medium having a perpendicularly-magnetized film, the intensity of said laser beam is caused to correspond to reproducing, recording and erasing operations, an external magnetic field is applied to the recording medium at least in recording and erasing periods so that the magnetic field in the recording period is opposite in direction to the magnetic field in the erasing period, a light quantity signal corresponding to the light quantity reflected from the recording medium and a magnetization signal corresponding to data recorded on the recording medium are produced by using the reflected light from the recording medium, at least one of the light quantity signal and the magnetization is amplified by a variable gain amplifier so that an amplified value in the erasing period is nearly equal to an amplified value in the reproducing period, a defect on the recording medium is detected from the output of the variable gain amplifier in the erasing period, and defect information thus obtained is utilized to record data in a non-defective region of the recording medium.

    摘要翻译： 公开了一种磁光存储装置，其中激光束聚焦在具有垂直磁化膜的记录介质上，使得激光束的强度对应于再现，记录和擦除操作，施加外部磁场 至少在记录和擦除周期到记录介质，使得记录周期中的磁场在擦除周期中与磁场的方向相反，对应于从记录介质反射的光量的光量信号和磁化 通过使用来自记录介质的反射光产生对应于记录在记录介质上的数据的信号，光量信号和磁化中的至少一个被可变增益放大器放大，使得擦除周期中的放大值几乎 在再现期间等于放大值，从外部检测记录介质上的缺陷 并且利用这样获得的缺陷信息将数据记录在记录介质的无缺陷区域中。