公开(公告)号：USRE35435E

公开(公告)日：1997-01-28

申请号：US757911

申请日：1991-09-11

申请人： Atsushi Saito ,  Takeshi Maeda ,  Hisataka Sugiyama ,  Wasao Takasugi

发明人： Atsushi Saito ,  Takeshi Maeda ,  Hisataka Sugiyama ,  Wasao Takasugi

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B7/007

CPC分类号： G11B7/126 ,  G11B11/10528 ,  G11B11/1053 ,  G11B20/10009 ,  G11B20/10222 ,  G11B7/24085 ,  G11B11/10595

摘要： A method and an apparatus for recording and reproducing information for use with an optical disk apparatus in which a pit edge recording method is used. According to the pit edge recording method, the leading edge and the trailing edge of a hole pit or a record domain generated during a recording operation are dealt with as information. During the recording, the recording pulse width and the recording power are corrected, and during the reproduction, the variation in the edge position is corrected.

摘要翻译： 一种用于记录和再现用于其中使用凹坑边缘记录方法的光盘装置的信息的方法和装置。 根据凹坑边缘记录方法，作为信息处理在记录操作期间产生的孔坑或记录域的前缘和后缘。 在记录期间，记录脉冲宽度和记录功率被校正，并且在再现期间修正边缘位置的变化。

公开(公告)号：US5463600A

公开(公告)日：1995-10-31

申请号：US225315

申请日：1994-04-08

申请人： Fumiyoshi Kirino ,  Atsushi Saito ,  Tsuyoshi Toda ,  Hiroshi Ide ,  Hiroyuki Tsuchinaga ,  Takeshi Maeda ,  Fumio Kugiya

发明人： Fumiyoshi Kirino ,  Atsushi Saito ,  Tsuyoshi Toda ,  Hiroshi Ide ,  Hiroyuki Tsuchinaga ,  Takeshi Maeda ,  Fumio Kugiya

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B20/12 ,  G11C13/06 ,  G11B13/04

CPC分类号： G11B11/10506 ,  G11B11/10595 ,  G11C13/06

摘要： A magneto-optical disk system includes a magneto-optical disk and a disk drive. The magneto-optical disk drives provides a function of controlling the shape of a recorded domain by using a short wavelength laser beam and a test recording and a function of recording a using a pulse train. The magneto-optical disk has a laminated layer structure capable of obtaining a high S/N ratio and stabilizing a heat conduction. The magneto-optical disk drive with the recorded domain shape control function using a short wavelength laser beam and a test recording and with the pulse train recording record function is organically coupled with the magneto-optical disk having the laminated layer structure with a stabilized heat conduction to make the disk and the disk drive have an integrity therebetween, providing a magneto-optical disk having a recording capacity four times as large as the first generation magneto-optical disk system.

摘要翻译： 磁光盘系统包括磁光盘和磁盘驱动器。 磁光盘驱动器通过使用短波长激光束和测试记录以及使用脉冲串记录功能来提供控制记录域的形状的功能。 磁光盘具有能够获得高S / N比并稳定热传导的叠层结构。 具有使用短波长激光束和测试记录并具有脉冲串记录记录功能的记录域形状控制功能的磁光盘驱动器与具有稳定的热传导的层叠层结构的磁光盘有机耦合 为了使盘和盘驱动器之间具有完整性，提供具有与第一代磁光盘系统相同的四倍的记录容量的磁光盘。

公开(公告)号：US5418770A

公开(公告)日：1995-05-23

申请号：US764922

申请日：1991-09-24

申请人： Hiroshi Ide ,  Takeshi Maeda ,  Atsushi Saito

发明人： Hiroshi Ide ,  Takeshi Maeda ,  Atsushi Saito

IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/36 ,  G11B7/00

CPC分类号： G11B7/126 ,  G11B11/10508 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10212 ,  G11B20/1816 ,  G11B27/36 ,  G11B7/0045 ,  G11B7/24085 ,  G11B20/1258

摘要： A pit edge interval correcting method in an optical recording/read-out apparatus wherein as data items to be used to correct pit edge intervals for cancellation of a thermal interference from a previously recorded pattern, there is formed a table representing relationships between kinds of record patterns and edge shift quantities of the patterns in a read-out signal. Edge shift quantities of particular patterns with respect to a unitary variation quantity of a recording medium surface temperature (an ambient temperature of an optical disk) and edge shift quantities of particular patterns with respect to a unitary variation quantity of laser power are beforehand acquired as correction control data. Before actual data are recorded, the particular patterns are again recorded on a medium and read out therefrom. If an edge shift occurs in a read-out signal, a variation quantity of the recording medium surface temperature and a variation quantity of the laser power are separately obtained based on a quantity of the edge shift occurring and the correction control data collected in advance. Using each variation quantity, the value set to the laser power is altered and/or the data in the table are updated to correct the actual data.

摘要翻译： 光记录/读出装置中的凹坑边缘间隔校正方法，其中作为用于校正凹坑边缘间隔的数据项，用于从先前记录的图案中消除热干扰，形成表示记录种类之间关系的表 读出信号中的图案的图案和边缘移位量。 相对于记录介质表面温度（光盘的环境温度）的单位变化量和特定图案的边缘偏移量相对于激光功率的单位变化量的特定图案的边缘偏移量预先获取为校正 控制数据。 在记录实际数据之前，将特定图案再次记录在介质上并从中读出。 如果在读出信号中发生边沿位移，则根据发生的边沿位移的量和预先收集的校正控制数据分别获得记录介质表面温度的变化量和激光功率的变化量。 使用每个变化量，更改设置为激光功率的值和/或更新表中的数据以更正实际数据。

公开(公告)号：US5105409A

公开(公告)日：1992-04-14

申请号：US230971

申请日：1988-08-11

申请人： Toshimitsu Kaku ,  Kazuo Shigematsu ,  Hisataka Sugiyama ,  Takeshi Maeda ,  Masahiro Takasago

发明人： Toshimitsu Kaku ,  Kazuo Shigematsu ,  Hisataka Sugiyama ,  Takeshi Maeda ,  Masahiro Takasago

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/09

CPC分类号： G11B7/094

摘要： Disclosed is an optical recording and reproducing apparaus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an information processing circuit modulating the intensity of the light spot according to writing pulses to record information on the recording medium and using the electrical signal to reproduce information from the recording medium, and a tracking servo circuit carrying out tracking servo operation on the basis of the electrical signal and including an extracting circuit connected to a source of extracting pulses having a pulse width at least equal to the writing pulse width so that writing pulse parts contained in the electrical signal are extracted during recording information, whereby a track offset occurring during information recording can be minimized, and the stability of the tracking servo system can be improved.

公开(公告)号：US5060208A

公开(公告)日：1991-10-22

申请号：US288124

申请日：1988-12-22

申请人： Nobuyuki Nagai ,  Takeshi Maeda ,  Atsushi Saito ,  Takeshi Nakao ,  Hitoshi Watanabe

发明人： Nobuyuki Nagai ,  Takeshi Maeda ,  Atsushi Saito ,  Takeshi Nakao ,  Hitoshi Watanabe

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B19/02 ,  G11B20/10 ,  G11B20/14 ,  G11B27/30 ,  G11B27/36

CPC分类号： G11B20/10212 ,  G11B11/10508 ,  G11B11/1053 ,  G11B11/10595 ,  G11B19/02 ,  G11B27/30 ,  G11B27/36

摘要： A method and apparatus for recording a signal in a magneto-optical disk having pre-pits formed on a recording track which pits are optically detectable for generation of data read and write clocks. The method and apparatus includes the steps of: prior to writing data in the magnetooptical disk, writing a test pattern on a leading portion of a data recording area of the magnetooptical disk at predetermined timings; reading the data recording area to generate a time shift between the read-out test pattern and the original test pattern; adjusting the predetermined timings in accordance with the time shift to generate adjusted data write timings; and writing data in the data writing area in accordance with the adjusted data write timings and the apparatus therefore.

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。

公开(公告)号：US4802153A

公开(公告)日：1989-01-31

申请号：US842200

申请日：1986-03-21

申请人： Keiji Kataoka ,  Takeshi Maeda ,  Yoshito Tsunoda

发明人： Keiji Kataoka ,  Takeshi Maeda ,  Yoshito Tsunoda

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12

CPC分类号： G11B7/08558 ,  G11B7/08511 ,  G11B7/08552 ,  G11B7/1245

摘要： Accessing method and an apparatus therefor in an optical disc apparatus having an acousto-optic light deflector for deflecting a light spot to a different address or different track on an optical disc are disclosed. An auto-focus signal is held at a constant level for a predetermined period when the acousto-optic light deflector deflects the light spot. Thus, an affect caused by coexistence of a plurality of acoustic frequencies in the acoustic-optic device is eliminated and fast light accessing is attained.

摘要翻译： 公开了具有用于将光点偏转到光盘上的不同地址或不同轨道的声光偏转器的光盘装置中的访问方法及其装置。 当声光偏转器偏转光斑时，自动对焦信号被保持在一定的时间段上。 因此，消除了在声光装置中多个声频共存引起的影响，并且实现了快速的光访问。

公开(公告)号：US4742218A

公开(公告)日：1988-05-03

申请号：US828354

申请日：1986-02-11

申请人： Shigeru Nakamura ,  Toshimasa Kamisada ,  Akira Saito ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Toshimitsu Kaku ,  Tuyoshi Kato ,  Masaaki Hishiki ,  Masateru Watanabe

发明人： Shigeru Nakamura ,  Toshimasa Kamisada ,  Akira Saito ,  Takeshi Maeda ,  Yoshito Tsunoda ,  Toshimitsu Kaku ,  Tuyoshi Kato ,  Masaaki Hishiki ,  Masateru Watanabe

IPC分类号： G11B7/09 ,  G11B11/105 ,  G01J1/20 ,  G11B5/09

CPC分类号： G11B7/0912 ,  G11B11/10541 ,  G11B11/10576

摘要： A focus error detection apparatus and an optical disk apparatus comprising a focusing lens for focusing reflected light coming from a light reflecting surface which is to be adjusted at the focal point of a projected light beam; a beam splitter means for dividing the output light of said focusing lens into a first and a second focused light beam; a first and a second photo-detector disposed respectively on the optical paths of said first and said second focused light beam, one of which is located behind the convergence point of said first focused light beam and the other of which is located before the convergence point of said second focused light beam, each of them generating outputs proportional to the amount of light within a predetermined region of the received light image, when it varies so that it is enlarged; and a circuit generating a focus error signal by using the difference between the outputs of said two photo-detectors.

摘要翻译： 一种聚焦误差检测装置和光盘装置，包括：聚焦透镜，用于聚焦来自被投影光束的焦点处被调节的光反射表面的反射光; 分束器装置，用于将所述聚焦透镜的输出光分成第一和第二聚焦光束; 分别设置在所述第一和第二聚焦光束的光路上的第一和第二光电检测器，其中一个位于所述第一聚焦光束的会聚点之后，另一个位于会聚点之前 所述第二聚焦光束中的每一个产生与所接收的光图像的预定区域内的光量成比例的输出，当其变化使得其被放大时; 以及通过使用所述两个光电检测器的输出之间的差产生聚焦误差信号的电路。

公开(公告)号：US4646103A

公开(公告)日：1987-02-24

申请号：US832887

申请日：1986-02-26

申请人： Hisataka Sugiyama ,  Kazuo Shigematsu ,  Takeshi Maeda ,  Atsushi Saitoh ,  Wasao Takasugi

发明人： Hisataka Sugiyama ,  Kazuo Shigematsu ,  Takeshi Maeda ,  Atsushi Saitoh ,  Wasao Takasugi

IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/14 ,  G01D15/14 ,  G11B7/00 ,  G11B21/10

CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/1053 ,  G11B20/10009 ,  G11B20/1403 ,  G11B7/0045 ,  G11B7/24085

摘要： In an optical recording system wherein the intensity of a laser beam is modulated with an input modulation signal so as to record information on a recording medium, the intensity modulation of the laser beam is performed after the pulse waveform of the input modulation signal is converted into two pulses which express the front edge and rear edge of the pulse waveform respectively.

摘要翻译： 在其中利用输入调制信号调制激光束的强度以将信息记录在记录介质上的光学记录系统中，在将输入调制信号的脉冲波形转换成 两个脉冲分别表示脉冲波形的前沿和后沿。

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

IPC分类号： G02B7/28 ,  G02B27/40 ,  G11B7/09 ,  G11B7/135 ,  G11B7/1381 ,  G11B7/22 ,  G11B7/00

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。