公开(公告)号：US4982393A

公开(公告)日：1991-01-01

申请号：US233489

申请日：1988-08-17

申请人： Machiko Matsushita ,  Shigeto Kanda ,  Eiji Yamaguchi

发明人： Machiko Matsushita ,  Shigeto Kanda ,  Eiji Yamaguchi

IPC分类号： G11B7/09

CPC分类号： G11B7/0946 ,  G11B7/0033 ,  G11B7/0901

摘要： An apparatus for applying a light beam to an optical recording medium having tracks provided thereon and effecting at least one of recording and reproduction of information includes a light source emitting the light beam, an optical system for directing the light beam emitted from the light source to the medium, a device for receiving the light flux reflected by or transmitted through the medium and detecting a tracking error signal indicative of the deviation between the applied position of the light beam and a track, a tracking servo for moving at least a portion of the optical system on the basis of the tracking error signal and correcting the applied position of the light beam, a detector for detecting abnormality of tracking servo from the velocity of the moved portion of the optical system.

公开(公告)号：US4788671A

公开(公告)日：1988-11-29

申请号：US686152

申请日：1984-12-26

申请人： Shigeto Kanda

发明人： Shigeto Kanda

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/12 ,  G11B11/105 ,  G11B19/20 ,  G11B21/00 ,  G11B25/04 ,  G11B27/00 ,  G11B11/00

CPC分类号： G11B19/20 ,  G11B11/10552 ,  G11B11/10595 ,  G11B21/00 ,  G11B25/043 ,  G11B27/005 ,  G11B7/0037

摘要： There is disclosed an information recording and reproducing apparatus which is provided with a disk-shaped recording medium having a recording face allowing information recording and reproduction from both sides; a recording head positioned at a side of the recording face to record information thereon; a reproducing head positioned at the other side of the recording face to reproduce information recorded on the recording face; and a rotary drive unit for independently driving at least two of the disk-shaped recording medium, recording head and reproducing head about a same axis and in the circumferential direction of the recording medium.

摘要翻译： 公开了一种信息记录和再现装置，该信息记录和再现装置设置有具有允许从两侧进行信息记录和再现的记录面的盘形记录介质; 位于记录面侧的记录头，用于在其上记录信息; 位于记录面的另一侧的再现头，以再现记录在记录面上的信息; 以及旋转驱动单元，用于独立地驱动盘状记录介质，记录头和再现头中的至少两个绕着记录介质的相同轴线和圆周方向。

公开(公告)号：US5199023A

公开(公告)日：1993-03-30

申请号：US457863

申请日：1989-12-27

申请人： Masakuni Yamamoto ,  Shigeto Kanda

发明人： Masakuni Yamamoto ,  Shigeto Kanda

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B11/105

CPC分类号： G11B7/0938 ,  G11B7/24079 ,  G11B7/00745

摘要： An optical information recording medium includes a recording surface formed by a recording layer provided on a substrate, the recording surface being provided with parallel information tracks each divided into plural blocks, each of which is formed by a data area for information recording and a servo area for forming prepits for tracking signal detection, wherein the data area has a separating part the height of which is different from that of the information track and which is provided between information tracks adjacent to each other, and the difference in height is equal to or larger than the thickness of the recording layer, and wherein the servo area is not provided within the separating part.

公开(公告)号：US5067118A

公开(公告)日：1991-11-19

申请号：US334195

申请日：1989-04-06

申请人： Shigeto Kanda

发明人： Shigeto Kanda

IPC分类号： G01D5/14 ,  G01D5/244 ,  G01D5/245 ,  G11B7/085 ,  G11B17/34 ,  G11B21/02 ,  G11B21/08

CPC分类号： G11B21/02 ,  G11B17/34 ,  G11B21/08 ,  G11B7/08505 ,  G11B7/08582

摘要： A position detecting device includes a: generator for generating a plurality of phase-shifted signals which are alternately changed in accordance with changes in position or angle of a movable member; a selector for selecting one of the plurality of signals; supplier for supplying a variable level signal; adder for adding a signal selected by the selector and the variable level signal from the signal supplier and outputting a sum signal as a position detection signal; a detector for detecting a phase of the selected signal; and a controller for switching the signal selected by the selector and changing a level of the variable level signal from the signal supplier in accordance with an output from the phase detector.

公开(公告)号：US4982394A

公开(公告)日：1991-01-01

申请号：US224758

申请日：1988-07-27

申请人： Shigeto Kanda ,  Hiroto Kitai ,  Etsuo Yamada

发明人： Shigeto Kanda ,  Hiroto Kitai ,  Etsuo Yamada

IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B19/04

CPC分类号： G11B7/0033 ,  G11B19/04 ,  G11B7/0946

摘要： An optical information processing apparatus comprises an optical head having an optical system contained in a frame and effecting at least one of recording and reproduction of information by applying a light beam condensed by the optical system to a recording medium, a detector for detecting at least one of a tracking signal and a focusing signal, a controller for moving at least a portion of the optical system in accordance with at least one of the tracking signal and the focusing signal, a detector for detecting the postion of the moving portion of the optical system relative to the frame, a position controller for controlling the moving portion so as to be held in a predetermined position, on the basis of the output signal of the position detecting detector, a detector for detecting the abnormality of at least one of the tracking and focusing controls, and a switching device for alternatively operating the tracking and focusing controller and the position controller and rendering the tracking and focusing controller inoperative and operating the position controller when the abnormality of the tracking or focusing control is detected.

公开(公告)号：US4831613A

公开(公告)日：1989-05-16

申请号：US165385

申请日：1988-02-29

申请人： Shigeto Kanda

发明人： Shigeto Kanda

IPC分类号： G11B7/135 ,  G11B7/00 ,  G11B7/005 ,  G11B7/08 ,  G11B7/12 ,  G11B20/22

CPC分类号： G11B20/22 ,  G11B7/005 ,  G11B7/08 ,  G11B7/12

摘要： Disclosed are optical information reproducing method and apparatus wherein an information carrying member having an information pattern recorded thereon is irradiated by plural light beams which are spaced from each other in the direction of tracing of the information pattern, the light beams modulated by the information pattern are simultaneously and independently photoelectrically converted, and a predetermined operation is effected relative to the outputs obtained by the photoelectric conversion to thereby generate a reproduction signal with respect to the recorded information.

摘要翻译： 公开了一种光信息再现方法和装置，其中具有记录在其上的信息图案的信息携带构件被照射在沿信息图案的跟踪方向彼此间隔开的多个光束，由信息图案调制的光束是 同时且独立地进行光电转换，并且相对于通过光电转换获得的输出进行预定的操作，从而生成关于所记录的信息的再现信号。

公开(公告)号：US5150345A

公开(公告)日：1992-09-22

申请号：US794644

申请日：1991-11-18

申请人： Satoshi Shikichi ,  Shigeto Kanda

发明人： Satoshi Shikichi ,  Shigeto Kanda

IPC分类号： G02B7/28 ,  G11B7/0033 ,  G11B7/09

CPC分类号： G11B7/0941 ,  G11B7/0033

摘要： An optical information recording apparatus includes a recording device for condensing a light beam into a spot-like shape, the light beam having been intensity-modulated between at least two levels which are not zero, scanning the light beam on a recording medium and recording information thereon; a detector for detecting a signal indicative of the position error between the light beam spot and the medium in the focusing direction perpendicular to the surface of the medium or the tracking direction in a plane parallel to the surface of the medium which is perpendicular to tracks formed on the medium; a servo device for correcting the position error on the basis of the detected signal; a device for varying the gain of the servo device in conformity with the intensity level of the light beam for producing a gain output; and a device for sampling and holding the gain output as the intensity of the light beam shifts between different levels.

公开(公告)号：US5483514A

公开(公告)日：1996-01-09

申请号：US245649

申请日：1994-05-18

申请人： Shigeto Kanda

发明人： Shigeto Kanda

IPC分类号： G11B7/09 ,  G11B20/12 ,  G11B20/00

CPC分类号： G11B7/0941

摘要： In an optical information recording and/or reproducing apparatus, information is recorded by applying a beam of light to an optical recording medium and/or the recorded information is reproduced by receiving the reflected light of a beam of light applied to the optical recording medium by a photosensor divided into a plurality of sections. The apparatus has a subtractor for subtracting a plurality of signals from the photosensor divided into a plurality of sections, dividing means for dividing a part of a photocurrent from the photosensor into a predetermined frequency component and a predetermined high frequency component, amplifying means for amplifying the signal of the low frequency component and the signal of the high frequency component produced by the dividing means, an adder for adding the both signals amplified by the amplifying means, and a divider for dividing a subtraction signal obtained by the subtractor by an addition signal obtained by the adder to thereby normalize a servo signal.

摘要翻译： 在光学信息记录和/或再现装置中，通过向光学记录介质施加光束来记录信息和/或通过接收通过光学记录介质施加到光学记录介质的光束的反射光来再现记录的信息 光电传感器被分成多个部分。 该装置具有减法器，用于从被划分成多个部分的光电传感器中减去多个信号，用于将来自光电传感器的光电流的一部分划分成预定频率分量和预定高频分量的分频装置， 低频分量的信号和由分割装置产生的高频分量的信号，用于将由放大装置放大的两个信号相加的加法器和用于将由减法器获得的减法信号除以加法信号的分频器获得的加法器 由此对伺服信号进行归一化。

公开(公告)号：US5307338A

公开(公告)日：1994-04-26

申请号：US86373

申请日：1993-07-06

申请人： Kazunori Suzuki ,  Shigeto Kanda ,  Tomoyuki Hiroki ,  Hideki Hosoya

发明人： Kazunori Suzuki ,  Shigeto Kanda ,  Tomoyuki Hiroki ,  Hideki Hosoya

IPC分类号： G06K7/10 ,  G11B17/02 ,  G11B17/04 ,  G11B19/02 ,  G11B19/20 ,  G11B25/04

CPC分类号： G06K19/044 ,  G06K7/10 ,  G11B17/02 ,  G11B17/0408 ,  G11B19/02 ,  G11B19/20 ,  G11B25/046

摘要： An information recording and/or reproducing apparatus comprises a head section to record and/or reproduce information onto/from an information recording medium having a shape other than a circular shape, holding device for holding the information recording medium and rotating the medium, moving device for moving the holding device in a predetermined direction, detecting device for detecting a rotating position of the information recording medium held to the holding device, and control device for controlling movable guide device in correspondence to a signal from the detecting device.

摘要翻译： 一种信息记录和/或再现装置，包括用于在具有不同于圆形形状的信息记录介质上记录和/或再现信息的头部，用于保持信息记录介质并旋转介质的移动装置 用于沿预定方向移动保持装置，用于检测保持在保持装置上的信息记录介质的旋转位置的检测装置，以及用于根据来自检测装置的信号控制可移动引导装置的控制装置。

公开(公告)号：US5206847A

公开(公告)日：1993-04-27

申请号：US501737

申请日：1990-03-30

申请人： Shigeto Kanda

发明人： Shigeto Kanda

IPC分类号： G11B7/26 ,  G11B7/007 ,  G11B7/09 ,  G11B20/12

CPC分类号： G11B7/00745 ,  G11B20/1258 ,  G11B7/0079

摘要： There is disclosed an information recording disk, and a method and apparatus for information recording and reproduction, enabling secure tracking and full utilization of the recording capacity. For this purpose, a spiral or concentric track divided into plural sectors is provided with servo signals for detecting tracking error, by an integral number per sector, and the number is made different between the tracks in the radially inner area of the disk and those in the outer area. The disk is rotated at a constant angular velocity, and the tracking error is detected by the servo signals with a first clock signal of a constant frequency, while the information recording and/or reproduction is conducted with a second clock signal having a frequency higher for the tracks in the outer area of the disk.