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。

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：US4163149A

公开(公告)日：1979-07-31

申请号：US819861

申请日：1977-07-28

申请人： Susumu Sawano ,  Yoshito Tsunoda ,  Takeshi Maeda

发明人： Susumu Sawano ,  Yoshito Tsunoda ,  Takeshi Maeda

IPC分类号： G11B7/09 ,  G01J1/36

CPC分类号： G11B7/0909 ,  G11B7/094

摘要： In automatic focusing apparatus comprising a laser source, optical means for causing a light beam from the laser source to follow an information track on an information recorded medium, a photodetector which consists of quartered photodetection portions and to which a reflected light beam from the information track is guided through a cylindrical lens, and means for controlling the focusing of the light beam by the use of an error signal obtained from the shape and the intensity distribution of a light spot on the four photodetection portions, the improvement wherein a compensation signal is created from the absolute value of a difference between outputs from one set of the opposing photodetection portions and the absolute value of a difference between outputs from the other set of the opposing photodetection portions, to compensate for a disturbance ascribable to a movement of the light spot on the photodetector which arises in correspondence with the error signal.

摘要翻译： 在包括激光源的自动聚焦装置中，用于使来自激光源的光束跟随信息记录介质上的信息轨道的光学装置，由四分之一的光电检测部分组成的光电检测器，并且来自信息轨道的反射光束 被引导通过柱面透镜，以及用于通过使用从四个光电检测部分上的光点的形状和强度分布获得的误差信号来控制光束的聚焦的装置，其中产生补偿信号的改进 来自一组相对光检测部分的输出之间的差的绝对值和来自相对光检测部分的另一组的输出之间的差的绝对值，以补偿由于光斑运动引起的干扰 该光检测器与误差信号相对应地产生。

公开(公告)号：US5574881A

公开(公告)日：1996-11-12

申请号：US511779

申请日：1995-08-10

申请人： Hiroshi Yasuoka ,  Yoshito Tsunoda ,  Takeshi Maeda ,  Yoshihisa Kamo ,  Hiromichi Fujisawa ,  Zenji Tsutsumi ,  Shunichi Torii

发明人： Hiroshi Yasuoka ,  Yoshito Tsunoda ,  Takeshi Maeda ,  Yoshihisa Kamo ,  Hiromichi Fujisawa ,  Zenji Tsutsumi ,  Shunichi Torii

IPC分类号： G11B25/04 ,  G06F3/06 ,  G06F12/00 ,  G11B7/00 ,  G11B7/004 ,  G11B19/20 ,  G11B21/00 ,  G11B27/10 ,  G11B27/36 ,  G06F13/00 ,  G06F12/12 ,  G11B17/22

CPC分类号： G11B19/20 ,  G06F3/0601 ,  G11B21/00 ,  G11B27/105 ,  G11B5/5578 ,  G06F2003/0692 ,  G11B2220/20 ,  G11B2220/41 ,  G11B27/36

摘要： A fast access high capacity data storage system and method are disclosed, the data storage system including a disk-based storage system employing a plurality of storage surfaces. Selected storage surfaces have a plurality of independently controlled data access heads in data communication therewith, and circuitry is provided for allowing concurrent data transfers through the plurality of data access heads. Performance is further improved by monitoring frequently accessed data records and transferring them to a copy recording surface or recording surfaces less frequently used, and by moving a data access head of the plurality of data access heads to other recording surfaces to decrease access bottlenecks. The storage system further includes circuitry for averaging at least one of record length data, transfer timing data, access timing data and address data.

摘要翻译： 公开了一种快速访问高容量数据存储系统和方法，该数据存储系统包括采用多个存储表面的基于盘的存储系统。 所选择的存储表面具有与其数据通信的多个独立控制的数据访问头，并且提供电路以允许通过多个数据访问头并发数据传输。 通过监视频繁访问的数据记录并将其传送到复制记录表面或不太频繁使用的记录表面，并通过将多个数据访问头的数据访问头移动到其他记录表面来减少访问瓶颈，进一步提高了性能。 存储系统还包括用于平均记录长度数据，传送定时数据，访问定时数据和地址数据中的至少一个的电路。

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：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：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：US06671239B2

公开(公告)日：2003-12-30

申请号：US10214365

申请日：2002-08-08

申请人： Tsuyoshi Toda ,  Shigeru Nakamura ,  Takeshi Maeda

发明人： Tsuyoshi Toda ,  Shigeru Nakamura ,  Takeshi Maeda

IPC分类号： G11B700

CPC分类号： G11B7/126 ,  G11B7/00454 ,  G11B7/006

摘要： An information recording/reproducing apparatus for overwriting information by applying light from an optical head to a record area and a space of a rewritable recording medium and changing a state of the record area and for reading the information recorded in the record area. The apparatus includes a detector circuit for detecting a state of the record area and the space where information is already recorded by detecting a reflection light while recording information thereon by overwriting, a control circuit for calculating a radiation power used for recording the information and for forming the space on the record area so as to overwrite where information is already recorded in the recording medium, in accordance with the detected reflection light, a pulse generator circuit, and an optical driver circuit.

公开(公告)号：US06445659B1

公开(公告)日：2002-09-03

申请号：US09784115

申请日：2001-02-16

申请人： Tsuyoshi Toda ,  Shigeru Nakamura ,  Takeshi Maeda

发明人： Tsuyoshi Toda ,  Shigeru Nakamura ,  Takeshi Maeda

IPC分类号： G11B700

摘要： An information recording/reproducing apparatus includes a detector circuit for detecting a state of reflection light from the recording medium, a control circuit for calculating a radiation power used for writing the information in the recording medium, in accordance with the reflection light state, a pulse generator circuit for generating record pulse information in accordance with the radiation power, and an optical driver circuit for converting the record pulse information into optical information in accordance with the radiation power and driving the optical head to record the light information into the recording medium. Accordingly, the apparatus records information by applying light from an optical head to a record area of a recording medium and changing a state of the record area and reads the information recorded in the record area.

公开(公告)号：US06717898B2

公开(公告)日：2004-04-06

申请号：US10436257

申请日：2003-05-13

申请人： Shigeru Nakamura ,  Takeshi Maeda ,  Koichiro Wakabayashi

发明人： Shigeru Nakamura ,  Takeshi Maeda ,  Koichiro Wakabayashi

IPC分类号： G11B576

CPC分类号： G11B20/10009 ,  G11B7/005

摘要： An optical information reproducing method for reproducing information recorded at at least one mark on an optical information medium. The method includes irradiating a laser to the optical information medium, detecting a reflected beam reflected from the optical information medium, and reproducing information recorded on the optical information medium from an output signal of a detector which detects the reflected beam. The step of reproducing information is changed in dependence upon a length of the mark of the optical information medium.

摘要翻译： 一种用于再现记录在光信息介质上的至少一个标记上的信息的光信息再现方法。 该方法包括：向光学信息介质照射激光，检测从光学信息介质反射的反射光束，以及从检测反射光束的检测器的输出信号再现记录在光学信息介质上的信息。 再现信息的步骤根据光信息介质的标记的长度而改变。