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公开(公告)号：US4523089A
公开(公告)日：1985-06-11
申请号：US411809
申请日：1982-08-26
IPC分类号： G11B7/125 , H01S5/068 , H01S5/0683 , G01J1/32 , H01S3/10
CPC分类号： H01S5/06835
摘要： A driving circuit for driving a semiconductor laser by a driving signal containing a pulse signal representing given information and superposed on a DC bias signal includes means for monitoring intensity of laser light emitted when the DC bias is applied, and means for monitoring the intensity of laser light emitted when the pulse signal is applied. The DC bias signal and the pulse signal are varied in dependence on the result of comparisons between the outputs of the monitoring means and respective predetermined reference values.
摘要翻译： 用于通过包含表示给定信息并叠加在DC偏置信号上的脉冲信号的驱动信号驱动半导体激光器的驱动电路包括用于监视施加DC偏压时发射的激光的强度的装置，以及用于监视激光强度的装置 当施加脉冲信号时发出光。 DC偏置信号和脉冲信号根据监视装置的输出与相应的预定参考值之间的比较结果而变化。
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公开(公告)号：US4554652A
公开(公告)日：1985-11-19
申请号：US490165
申请日：1983-04-29
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/007 , G11B7/09 , G11B7/125 , G11B19/04 , G11B20/10 , G11B20/12 , G11B20/18 , G11B27/36
CPC分类号： G11B27/36 , G11B19/04 , G11B20/10 , G11B20/1217 , G11B20/18 , G11B7/0045 , G11B7/007 , G11B7/125 , G11B2220/2537
摘要： An optical information processor records predetermined information along a track on a recording medium through the irradiation of a light beam intensity-modulated in accordance with the predetermined information. A tracking signal obtained when the light beam traces the track, is compared with first and second preset values which define a predetermined range. When the tracking signal departs from the predetermined range, the intensity modulation of the light beam or the recording operation is stopped, thereby preventing data destruction which otherwise occurs due to the digression of the light beam from the track.
摘要翻译： 光学信息处理器通过照射根据预定信息强度调制的光束，沿着记录介质上的轨道记录预定信息。 当光束跟踪轨道时获得的跟踪信号与限定预定范围的第一和第二预设值进行比较。 当跟踪信号偏离预定范围时，光束的强度调制或记录操作停止，从而防止由于来自轨迹的光束的分离而出现的数据破坏。
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公开(公告)号：US4563760A
公开(公告)日：1986-01-07
申请号：US401020
申请日：1982-07-22
申请人： Takeshi Maeda , Kazuo Shigematsu , Masahiro Takasago , Yasumitsu Mizoguchi , Zenji Tsutsumi , Yoshito Tsunoda , Motoo Uno
发明人： Takeshi Maeda , Kazuo Shigematsu , Masahiro Takasago , Yasumitsu Mizoguchi , Zenji Tsutsumi , Yoshito Tsunoda , Motoo Uno
CPC分类号： G11B7/08 , G11B7/09 , G11B7/0901 , G11B7/0941
摘要： A method of detecting a light spot control signal is disclosed in which, when information is reproduced from an optical disk for optically recording information, a signal level obtained at a high-reflectivity portion of the optical disk is taken out of a signal reproduced from the optical disk, and is used as a control signal, which controls a light spot so that it tracks information stored in the optical disk.
摘要翻译： 公开了一种检测光点控制信号的方法，其中当从用于光学记录信息的光盘再现信息时，从从光盘中再现的信号中取出在光盘的高反射率部分获得的信号电平 光盘，并且被用作控制信号，其控制光点，使得其跟踪存储在光盘中的信息。
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公开(公告)号：US4450547A
公开(公告)日：1984-05-22
申请号：US313218
申请日：1981-10-20
申请人： Shigeru Nakamura , Takeshi Maeda , Toshimitsu Kaku , Yoshito Tsunoda , Wasao Takasugi , Tokuya Kaneda
发明人： Shigeru Nakamura , Takeshi Maeda , Toshimitsu Kaku , Yoshito Tsunoda , Wasao Takasugi , Tokuya Kaneda
CPC分类号： G11B7/1381 , G02B27/40 , G11B7/0908 , G11B7/0916 , G11B7/22
摘要： A focal position detecting optical apparatus wherein a light beam focused by a first optical system is irradiated on an object to be illuminated, focal point images are formed at two foci spaced apart from each other by a cylindrical lens disposed in a path of light beam reflected from the object, and a shielding element having a tip edge making an angle of approximately 45.degree. with an operating axis of the cylindrical lens is inserted at a site between the two foci and at which the light beam has a circular cross section to extract a portion of the light beam travelling between the two foci. The extracted portion is detected by two photodetectors disposed symmetrically with an axis lying in substantially the same direction as the tip edge, and the difference between outputs of the two photodetectors is produced for detection of an actual focal position of the first optical system.
摘要翻译： 一种焦点位置检测光学装置，其中由第一光学系统聚焦的光束照射在待照射的物体上，焦点图像通过设置在反射光束的路径中的柱面透镜彼此间隔开地形成在两个焦点处 并且具有与柱面透镜的操作轴线成约45度的尖端边缘的屏蔽元件插入在两个焦点之间的位置处，并且光束具有圆形横截面以提取 光束在两个焦点之间行进的部分。 提取部分由两个光电检测器检测，两个光电检测器以与尖端边缘基本相同的轴线对称布置，并且产生两个光电检测器的输出之间的差异，用于检测第一光学系统的实际焦点位置。
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公开(公告)号：US4550394A
公开(公告)日：1985-10-29
申请号：US479894
申请日：1983-03-29
CPC分类号： G11B7/24085 , G11B27/36 , G11B7/0903
摘要： An optical information recording system in which predetermined information is recorded by a first laser light beam on a recording medium along a guiding groove previously formed in the recording medium. Second and third laser light beams are projected onto the recording medium at positions deviated from the center of the guiding groove and preceding and succeeding to the first laser beam. A pattern in which no mutual interference of information to be recorded by the first laser beam is present is detected from an information signal which modulates the intensity of the first laser light beam. A difference is determined between the quantity of light reflected upon illumination of the recorded pattern by the second laser beam chronographically succeeding to the first laser beam and the quantity of light reflected upon illumination by the third laser beam. The position of the first laser beam is controlled on the basis of the thus determined difference for effecting an information tracking operation with improved accuracy.
摘要翻译： 一种光学信息记录系统，其中通过预先形成在记录介质中的导向槽，通过第一激光束将预定信息记录在记录介质上。 第二和第三激光束在与引导槽的中心偏离并在第一激光束之前和之后的位置处被投影到记录介质上。 从调制第一激光的强度的信息信号中检测不存在由第一激光束记录的信息的相互干扰的图案。 在通过第一激光束的时间计时的第二激光束照射记录图案反射的光量与由第三激光束照射反射的光量之间确定差异。 基于如此确定的差异来控制第一激光束的位置，以提高准确度进行信息跟踪操作。
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6.发明授权
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.
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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
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.
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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.
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公开(公告)号：US4855991A
公开(公告)日：1989-08-08
申请号：US10428
申请日：1987-02-03
CPC分类号： G11B27/30 , G11B20/10203 , G11B7/00745 , G11B7/09 , G11B7/094 , G11B7/0956 , G11B2220/2537
摘要： An optical disk having a disk-like substrate and a recording layer provided on the substrate. First and second regions are alternately arranged along a rotational direction of the optical disk. The first region includes a pre-formed optically detectable portion having an address area, and the second region has a guide groove serving as an optical guide for a light spot. A track offset detection area is provided for detecting track offset due to inclination of the optical disk and is disposed with respect to the first region and the second region so that the light spot is not affected by the first region and the second region. The track offset detection area is preferably a mirror portion disposed between the first region and the second region.
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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。
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