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    Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium
    4.
    发明授权
    Small-sized optical memory device and information processing apparatus utilizing cylindrically shaped information recording medium 失效
    小尺寸光学记忆体设备和信息处理设备利用圆柱形信息记录介质

    公开(公告)号：US5109374A

    公开(公告)日：1992-04-28

    申请号：US406519

    申请日：1989-09-13

    申请人： Yoshito Tsunoda ,  Hiroshi Yasuoka ,  Takeshi Maeda

    发明人： Yoshito Tsunoda ,  Hiroshi Yasuoka ,  Takeshi Maeda

    IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/0025 ,  G11B7/09 ,  G11B7/24 ,  G11B11/105

    CPC分类号： G11B11/10584 ,  G11B11/10552 ,  G11B11/10556 ,  G11B11/10576 ,  G11B7/0025 ,  G11B7/24 ,  G11B7/24003

    摘要： An optical memory device includes a cylindrically-shaped optical information recording medium and at least one optical head disposed around the information recording medium for irradiating the information recording medium with a light spot for recording or reproduction of information. The optical head has light spot moving means incorporated therein for the irradiation position of the light spot. The recording or reproduction of information is achieved by causing the light spot moving means to perform tracking control so that the light spot follows a desired track in an area within a range of movement of the light spot by the light spot moving means (or an infromation recording zone) in a state in which the relative positional relationship between the optical head and the cylindrically-shaped information recording medium in the direction parallel to the direction of the rotation axis of the information recording medium is fixed, with the optical head being not moved. The device can be constructed so that the position of either the optical head or the cylindrically-shaped information recording medium relative to the other in the direction parallel to the direction of the rotation axis of the information recording medium is mechanically moved, thereby making it possible to cahnge the information recording zone in the range of movement of the light spot by the light spot moving means to another information recording zone.

    Method of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the method
    5.
    发明授权
    Method of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the method 失效
    使用可用于信息重叠记录的记录介质，记录介质和使用该方法的记录和再现装置来记录和再现信息的方法

    公开(公告)号：US5218599A

    公开(公告)日：1993-06-08

    申请号：US412474

    申请日：1989-09-26

    申请人： Toshiaki Tsuyoshi ,  Yoshito Tsunoda ,  Hiromichi Fujisawa

    发明人： Toshiaki Tsuyoshi ,  Yoshito Tsunoda ,  Hiromichi Fujisawa

    IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24 ,  G11B7/30 ,  G11B11/105 ,  G11B13/00 ,  G11B13/04 ,  G11B20/12 ,  G11B27/32

    CPC分类号： G11B11/10584 ,  G11B11/10597 ,  G11B13/045 ,  G11B27/327 ,  G11B2020/1259 ,  G11B2220/211 ,  G11B2220/2525 ,  G11B7/0079

    摘要： A recording medium is provided with a recording film having opto-magnetic characteristics formed on the substrate, with first information being recorded in advance in the form of pit strings of a phase structure. Second information is recorded over the first information through the application of a magnetic field with polarities corresponding to the second information in the presence of the irradiation of a high-power radiation beam, without damaging the record of the first information. The first and second information are produced independently and simultaneously with a single spot in the same area by use of different signal reproduction mechanisms for the first information and second information. The first information (ROM information) is reproduced as the variation in the amount (intensity) of the reflected light from the opto-magnetic recording film, and the second information (RAM information) is reproduced by detecting the rotational angle of the reflected light, based on the Kerr effect, from the opto-magnetic film concurrently with the reproduction of the first information using a single spot.

    摘要翻译： 记录介质设置有具有形成在基板上的光磁特性的记录膜，其中预先以相位结构的凹坑串的形式记录第一信息。 在存在高功率辐射束的照射的情况下，通过施加具有与第二信息对应的极性的磁场，在第一信息上记录第二信息，而不损害第一信息的记录。 通过对于第一信息和第二信息使用不同的信号再现机制，第一和第二信息与同一区域中的单个点独立地同时产生。 第一信息（ROM信息）被再现为来自光电记录膜的反射光的量（强度）的变化，并且通过检测反射光的旋转角度再现第二信息（RAM信息） 基于克尔效应，从与使用单个点的第一信息的再现同时的光磁膜。

    Apparatus for optical disc memory with correction pattern and master disc cutting apparatus
    7.
    发明授权
    Apparatus for optical disc memory with correction pattern and master disc cutting apparatus 失效
    具有校正图案和主光盘切割设备的光盘存储器的设备

    公开(公告)号：US5084860A

    公开(公告)日：1992-01-28

    申请号：US551025

    申请日：1990-07-11

    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.

    Information recording/reproducing method and apparatus
    8.
    发明授权
    Information recording/reproducing method and apparatus 失效
    信息记录/再现方法和装置

    公开(公告)号：US5073880A

    公开(公告)日：1991-12-17

    申请号：US285584

    申请日：1988-12-16

    申请人： Takeshi Maeda ,  Yoshito Tsunoda

    发明人： Takeshi Maeda ,  Yoshito Tsunoda

    IPC分类号： G11B7/09 ,  G11B11/105 ,  G11B21/10

    CPC分类号： G11B7/0938 ,  G11B11/10565 ,  G11B11/10578 ,  G11B21/106

    摘要： Data recording and/or reproduction on or from a recording medium on which tracking signal detection marks are intermittently provided along each track in a pattern wobbling alternately across the track center line with a very small lateral displacement therefrom, wherein data recording area is defined between the tracking signal detection mark. A servo control system for controlling a write/read light spot so as to follow the track with the aid of a tracking signal obtained by detecting the tracking signal detection marks is provided with a low-pass filter circuit having a cut-off frequency lower than the frequency at which the tracking signal detection marks are detected. A data is recorded or reproduced on or from the recording areas of the recording medium while following the track under the control of the servo system. A blank area where data recording is inhibited is provided between the data recording area and the tracking signal detecting mark (prepit) to suppress interference to the data. A particular access prepit pattern which allows track addresses to be at least approximately detected upon passing of the light spot over the track of the recording medium is previously provided together with synchronizing marks in a synchronizing area.

    Information play-back apparatus with astigmatic auto-focusing
    10.
    发明授权
    Information play-back apparatus with astigmatic auto-focusing 失效
    具有散光自动对焦的信息播放装置

    公开(公告)号：US4293944A

    公开(公告)日：1981-10-06

    申请号：US810166

    申请日：1977-06-27

    申请人： Morishi Izumita ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Susumu Sawano

    发明人： Morishi Izumita ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Susumu Sawano

    IPC分类号： G11B7/0037 ,  G11B7/09 ,  G11B7/095 ,  G11B7/12 ,  G11B17/00

    CPC分类号： G11B7/0037 ,  G11B7/0909 ,  G11B7/0953

    摘要： Information play-back apparatus comprising a laser source, a recording medium, a photodetector, a first optical system which conducts a laser beam from the laser source to an information track on the recording medium as a read spot, and a second optical system which conducts a reflected laser beam from the information track to the photodetector through an optical element having the unidirectional lens action, said optical element being arranged in a manner to define an angle of about 45 degrees relative to the direction of the information track, and said photodetector having at least four light receiving portions divided symmetrically about two axes such that at least one light receiving portion is in each of the four quadrants formed by two axes, and one of the axes is parallel to the direction of the information track.

    摘要翻译： 信息回放装置，包括激光源，记录介质，光电检测器，将来自激光源的激光束传导到作为读取点的记录介质上的信息轨道的第一光学系统，以及第二光学系统， 通过具有单向透镜作用的光学元件从信息轨道到光电检测器的反射激光束，所述光学元件以相对于信息轨道的方向限定约45度的角度的方式布置，并且所述光电检测器具有 至少四个光接收部分围绕两个轴对称地分开，使得至少一个光接收部分在由两个轴形成的四个象限中的每一个中，并且一个轴平行于信息轨道的方向。