公开(公告)号：US4523089A

公开(公告)日：1985-06-11

申请号：US411809

申请日：1982-08-26

申请人： Takeshi Maeda ,  Yasumitsu Mizoguchi ,  Masahiro Takasago ,  Tokuya Kaneda ,  Yoshito Tsunoda

发明人： Takeshi Maeda ,  Yasumitsu Mizoguchi ,  Masahiro Takasago ,  Tokuya Kaneda ,  Yoshito Tsunoda

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。

公开(公告)号：US4554652A

公开(公告)日：1985-11-19

申请号：US490165

申请日：1983-04-29

申请人： Takeshi Maeda ,  Yoshito Tsunoda ,  Takakazu Huno ,  Masahiro Takasago ,  Yasumitsu Mizoguchi

发明人： Takeshi Maeda ,  Yoshito Tsunoda ,  Takakazu Huno ,  Masahiro Takasago ,  Yasumitsu Mizoguchi

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。

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

IPC分类号： G02B7/28 ,  G11B7/08 ,  G11B7/09 ,  G11B7/00

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。

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。

公开(公告)号：US4650332A

公开(公告)日：1987-03-17

申请号：US718278

申请日：1985-04-01

申请人： Koji Muraoka ,  Takeshi Maeda ,  Masahiro Takasago ,  Tokuya Kaneda

发明人： Koji Muraoka ,  Takeshi Maeda ,  Masahiro Takasago ,  Tokuya Kaneda

IPC分类号： G01D5/36 ,  G01D5/38 ,  G01B11/14 ,  G01J1/32

CPC分类号： G01D5/36

摘要： In an optical position detecting apparatus using moire, two light receiving elements are associated with a single light emitting element, and moire or grating portions of an auxiliary moire i.e., fixed sub-scale opposing the respective light receiving elements are arranged such that detection signals produced from the two light receiving elements upon movement of a movable moire i.e., main scale are substantially 180.degree. out of phase. The difference between the detection signals from the light receiving elements is used as a positioning signal, and the sum of the detection signals from the light receiving elements is used as a signal for controlling the input of the light emitting element.

摘要翻译： 在使用莫尔条纹的光学位置检测装置中，两个光接收元件与单个发光元件相关联，并且配置辅助波纹的莫尔条纹或光栅部分，即与各个光接收元件相对的固定子刻度，使得产生检测信号 来自两个光接收元件的移动可移动的莫尔条，即主刻度大致相差180度。 来自光接收元件的检测信号之间的差异用作定位信号，并且来自光接收元件的检测信号的和被用作用于控制发光元件的输入的信号。

公开(公告)号：US4542491A

公开(公告)日：1985-09-17

申请号：US438774

申请日：1982-11-03

申请人： Masahiro Takasago ,  Takeshi Maeda ,  Motoo Uno ,  Yasumitsu Mizoguchi

发明人： Masahiro Takasago ,  Takeshi Maeda ,  Motoo Uno ,  Yasumitsu Mizoguchi

IPC分类号： G02B7/28 ,  G11B7/085 ,  G11B7/09 ,  G11B7/00

CPC分类号： G11B7/08511 ,  G11B7/0909

摘要： An optical information disc apparatus includes a laser source, a recording medium with an information track, an optical system for emitting a laser beam from the laser source onto the information track, a photodetector detecting the focus error of the optical system using the light reflected from the information track, and an auto-focusing servo system operating the optical system to make the focus of the system follow the upward and downward movement of the recording medium, the optical information disc apparatus being further provided with a control circuit to make the auto-focusing servo system effective only when the optical system is in a position equivalent to the linear region of a defocusing signal having an S-curve characteristic.

摘要翻译： 一种光学信息盘装置，包括激光源，具有信息轨道的记录介质，用于将激光源发射到信息轨道上的激光束的光学系统，光检测器，其使用从 信息轨道，以及操作光学系统以使系统的焦点跟随记录介质的向上和向下移动的自动聚焦伺服系统，光学信息盘设备还设置有控制电路， 只有当光学系统处于与具有S曲线特性的散焦信号的线性区域相当的位置时，聚焦伺服系统才有效。

公开(公告)号：US4607358A

公开(公告)日：1986-08-19

申请号：US736125

申请日：1985-05-20

申请人： Takeshi Maeda ,  Motoo Uno ,  Kouji Muraoka ,  Masahiro Takasago ,  Yasumitsu Mizoguchi ,  Tokuya Kaneko

发明人： Takeshi Maeda ,  Motoo Uno ,  Kouji Muraoka ,  Masahiro Takasago ,  Yasumitsu Mizoguchi ,  Tokuya Kaneko

IPC分类号： G11B7/08 ,  G11B7/085 ,  G11B7/09 ,  G11B17/00 ,  G11B7/00

CPC分类号： G11B7/08517 ,  G11B17/005 ,  G11B7/08529 ,  G11B7/08588 ,  G11B7/0901

摘要： In an optical memory apparatus wherein predetermined information is optically recorded on a recording medium along guide grooves previously formed and then played back; an optical memory apparatus wherein, using a tracking signal and a signal indicating the quantity of reflected light at the time at which a projected light beam passes through the guide grooves, the directions in which the light beam passes through the grooves and the number of the guide grooves to be passed are detected, a seek control is performed by adding and subtracting the numbers of the guide grooves to be passed, depending upon the directions of passage, and fine positioning is thereafter performed by the use of the tracking signal.

摘要翻译： 在光存储装置中，其中预先确定的信息沿预先形成的导向槽光记录在记录介质上，然后重放; 一种光存储装置，其中使用跟踪信号和指示投影光束穿过引导槽的时间处的反射光量的信号，光束通过凹槽的方向和 检测要通过的引导槽，通过根据通过方向加减去要通过的引导槽的数量来执行寻道控制，然后通过使用跟踪信号进行精细定位。

公开(公告)号：US4550394A

公开(公告)日：1985-10-29

申请号：US479894

申请日：1983-03-29

申请人： Takeshi Maeda ,  Masahiro Takasago ,  Yoshito Tsunoda

发明人： Takeshi Maeda ,  Masahiro Takasago ,  Yoshito Tsunoda

IPC分类号： G11B7/013 ,  G11B7/09 ,  G11B27/36 ,  G11B7/00 ,  G11B21/10

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。

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。