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1. 发明专利

JPH07320324A MAGNETO-OPTICAL RECORDING MEDIUM AND REPRODUCTION METHOD THEREFOR 失效
公开(公告)号：JPH07320324A
公开(公告)日：1995-12-08
申请号：JP10680594
申请日：1994-05-20
申请人： JAPAN BROADCASTING CORP , MITSUBISHI CHEM CORP
发明人： TOKUMARU HARUKI , ARAI KIYOTAKA , SHIMAMORI YOSHIMI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To attain a large rotational angle while ensuring a sufficient reflectance by forming a semi-reflective layer of a thin film of a specific metal element or an alloy thereof and to attain a sufficient reflectance even with an optical interference layer of such a thickness as maximizing the Kerr's rotational angle. CONSTITUTION:A magnetic layer, a semi-reflective layer for reflecting a part of the light from a light source to the side closer to the light source than the magnetic layer and transmitting the remainder, and a reflective layer for reflecting the light from the light source to the side farther from the light source than the magnetic layer are formed on a substrate to constitute the magneto-optical recording medium. The semi-reflective layer is composed of a thin film pricipally one or more than one element selected from among Au, Ag and Cu. This constitution realizes the magneto-optical recording medium exhibiting a reflectance and a large Kerr's rotational angle sufficient for reproduction at the limit of shot noise.

2. 发明专利

JPH05325188A OPTICAL RECORDING APPARATUS 失效
公开(公告)号：JPH05325188A
公开(公告)日：1993-12-10
申请号：JP12870592
申请日：1992-05-21
申请人： JAPAN BROADCASTING CORP
发明人： TOKUMARU HARUKI , ARAI KIYOTAKA
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125
摘要： PURPOSE:To obtain a stable recording operation by a method wherein a laser-driving current is controlled by utilizing the driving signal of, and positional information on, a relay lens for focusing use and a change in recording power on the face of a recording medium due to the displacement of the relay lens for focusing control use is suppressed. CONSTITUTION:A beam of recording-face reflected light from an optical recording medium 9 is passed through a light path in the reverse direction; it is reflected by a splitter 3; it is guided to a reproducing optical system 10; a servo signal for a focusing tracking operation is detected and a recorded signal is reproduced. When the displacement of a focusing relay lens 5 is zero, the aperture diameter of an object lens 8 is nearly equal to the light flux of a beam of object-lens incident light 11. The beam of lens incident light which displaces the lens 5 to the direction of the lens 8 by means of an actuator 6 is converged; its spot diameter becomes large; a beam of radiant light becomes large. When it is displaced to the reverse direction, the spot diameter is narrowed and the power is reduced. When it is displaced further, its diameter is increased again due to its aberration. The position of the focusing relay lens is detected; after that, the driving current of an LD is controlled in such a way that the arrival rate of LD radiant power on the recording medium in its position is not changed largely. Thereby, a stable recording operation is performed.

3. 发明专利

JPH11185302A TAPE-LIKE OPTICAL INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH11185302A
公开(公告)日：1999-07-09
申请号：JP34651597
申请日：1997-12-16
申请人： JAPAN BROADCASTING CORP , FUJI PHOTO FILM CO LTD
发明人： TOKUMARU HARUKI , SHIMIZU NAOKI , ARAI KIYOTAKA , INAGAKI YOSHIO , TSUJIMOTO TADAHIRO
IPC分类号： G11B7/24
摘要： PROBLEM TO BE SOLVED: To provide a tape-like optical information recording medium which is low in noise, makes it possible to obtain high signal intensity and has recording performance high in C/N. SOLUTION: A recording layer consisting of a laser beam responsive compd. and a high-polymer binder is deposited on a tape-like base. The weight ratio of the laser beam responsive compd. in this recording layer to the high-polymer binder is >=1. The state change of the recording layer is induced by irradiation with the laser beam, by which the information is recorded. The information is read by measuring the reflection intensity of the laser beam.

4. 发明专利

JPH07161053A OPTICAL TAPE AND TRACKING ERROR SIGNAL GENERATING METHOD 失效
公开(公告)号：JPH07161053A
公开(公告)日：1995-06-23
申请号：JP30285593
申请日：1993-12-02
申请人： JAPAN BROADCASTING CORP
发明人： ARAI KIYOTAKA , TOKUMARU HARUKI
IPC分类号： G11B7/00 , G11B7/003 , G11B7/09
摘要： PURPOSE:To obtain a tracking servo scanning stably on recording tracks recorded in a circular shape on an optical tape. CONSTITUTION:On an optical tape 9, tracking pilot signals fjc, fj+, fj- (j is the position of the width direction of the optical tape) are multiply recorded in the data signal of a video signal, etc., and also a track is constituted by recording so that the more the signals are heading to the center part with respect to the width direction of the tape the lower the frequencies of signals become (f1c

5. 发明专利

JP2002074818A OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JP2002074818A
公开(公告)日：2002-03-15
申请号：JP2000255255
申请日：2000-08-25
申请人： JAPAN BROADCASTING CORP
发明人： ARAI KIYOTAKA , KASAI HARUO , KOIDE DAIICHI , TOKUMARU HARUKI
IPC分类号： G11B19/20 , G11B7/095
摘要： PROBLEM TO BE SOLVED: To provide an optical disk driving device which permits to reduce an eccentric throw with accuracy, and is quiet and resistant to an external shock. SOLUTION: This optical disk driving device is provided with a means 32 for obtaining a direction and amount of a deviation between the track center and the rotation center of the disk using the information on a time interval of a light spot crossing plural tracks and an angle of rotation of the optical disk by scanning the surface of the rotating optical disk 1 with the light spot emitted from an optical head; a supporting mechanism 3 provided with two pieces of active deviation means which actively deviate the position of the optical disk coupled to and mounted on the rotary shaft of the rotary driving means 8 and at least one piece of passive deviation means which deviate it by an elastic body; and a means 32 for deviating the position of the optical disk in a desired direction by a desired amount and minimizing the distance between positions of the track outer and the rotation center by drive-controlling the two active deviation means according to the detection result by the means 32.

6. 发明专利

JP2001195760A TRACKING CONTROLLER 失效
公开(公告)号：JP2001195760A
公开(公告)日：2001-07-19
申请号：JP2000001952
申请日：2000-01-07
申请人： JAPAN BROADCASTING CORP , UNIV NAGAOKA TECHNOLOGY
发明人： ARAI KIYOTAKA , TOKUMARU HARUKI , OISHI KIYOSHI
IPC分类号： G11B7/095
摘要： PROBLEM TO BE SOLVED: To provide a tracking controller having stable and high follow-up performance for a track on an optical disk rotating at high speed containing the case that a period of one revolution is changed according to the radius of the optical disk such a CLV system and ZCLV system. SOLUTION: This tracking controller is provided with a tracking error generation means 1 generating a tracking error signal answering to a difference between a track position on the optical disk and a beam spot position emitted from an optical head, control means 2, 3 make the beam spot scan the target track on the optical disk based on a drive signal, a correction signal generation means 5 generating a correction signal based on the tracking error signal before a rotation period of at least one revolution of the optical disk, a pre- compensation means 6 generating a compensation signal compensating the amplitude and the phase of the correction signal and an addition means 7 adding the tracking error signal to the compensation signal and outputting the drive signal.

7. 发明专利

JP2000099967A TRACKING ERROR DETECTING METHOD AND OPTICAL REPRODUCING DEVICE 失效
公开(公告)号：JP2000099967A
公开(公告)日：2000-04-07
申请号：JP27377098
申请日：1998-09-28
申请人： JAPAN BROADCASTING CORP
发明人： ARAI KIYOTAKA , OKUMURA HIDEYO , TOKUMARU HARUKI
IPC分类号： G11B7/085 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To generate a tracking error signal by scanning a pilot signal recorded together with a data signal by an optical spot on one predetermined track among plural tracks and using the pilot signal detected by two predetermined optical spots in adjacent relation to each other. SOLUTION: A pilot signal of one-wave frequency is multiplexed on a data signal and recorded on one specified track among plural tracks scanned en block by plural optical spots on an optical recording medium surface. This one track is preferably made to one for scanning any one of optical spots, i.e., the optical spot at a center when the number of optical spots is odd and two optical spots closest to the center when the number thereof is even. A pilot signal is extracted from among signals read by the plural optical spots, and its amplitude is compared with a threshold value to generate a tracking error signal.

8. 发明专利

JPH11185301A TAPE-LIKE OPTICAL INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH11185301A
公开(公告)日：1999-07-09
申请号：JP34651497
申请日：1997-12-16
申请人： JAPAN BROADCASTING CORP , FUJI PHOTO FILM CO LTD
发明人： TOKUMARU HARUKI , SHIMIZU NAOKI , ARAI KIYOTAKA , INAGAKI YOSHIO , TSUJIMOTO TADAHIRO
IPC分类号： G11B7/24
摘要： PROBLEM TO BE SOLVED: To provide a tape-like optical information recording medium with which a large capacity and sufficiently large reading signal intensity are obtainable and a high C/N is obtainable. SOLUTION: A recording layer consisting of a laser beam responsive compd. and a high-polymer binder is deposited on a tape-like base. The thickness of this recording layer is 0.25 to 0.5 times the wavelength of the laser beam. The state change of the recording layer is induced by irradiation with the laser beam, by which the information is recorded. The information is read by measuring the reflection intensity of the laser beam.

9. 发明专利

JPH04278232A FOCUS SERVO CIRCUIT 失效
公开(公告)号：JPH04278232A
公开(公告)日：1992-10-02
申请号：JP3875391
申请日：1991-03-05
申请人： JAPAN BROADCASTING CORP
发明人： ARAI KIYOTAKA , TOKUMARU HARUKI
IPC分类号： G11B7/09
摘要： PURPOSE:To stabilize a focus servo system and enhance its performance by generating a gain which compensates change in the detection sensitivity of focus error, setting said gain to a focus error detection stage, and maintaining constant the whole servoloop gain. CONSTITUTION:An addition point 15 determines the deviation between the distance f1+ (distance between an object lens 4 and an optical recording medium) and a converging point f1+ ' of the lens 4 and outputs focus error voltage equivalent to and deviation - '. This voltage is amplified by a voltage control amplifier 17 and further amplified by a voltage amplifier 19 by way of a phase compensation equalizer 18, thereby driving a focus actuator 5. The converging point of the lens 4 is turned to f1+ ' by the displacement '' of the actuator 5 while the output of the amplifier 19 controls the gain of the amplifier 17 to the inverse number of the Fe detection sensitivity by way of a buffer amplifier 20 and a filter 21. This construction makes it possible to eliminate the characteristic deterioration of the focus servo system, stabilize and enhance its performance.

10. 发明专利

JPH0379132A OPTICAL INFORMATION TRANSMITTER-RECEIVER 失效
公开(公告)号：JPH0379132A
公开(公告)日：1991-04-04
申请号：JP21493889
申请日：1989-08-23
申请人： JAPAN BROADCASTING CORP
发明人： TOKUMARU HARUKI , ARAI KIYOTAKA , OBA YOSHINOBU
IPC分类号： G11B7/12 , G11B7/13 , G11B7/14 , H04B10/11 , H04B10/112 , H04B10/80
摘要： PURPOSE:To enable fast, high-density recording on a tape-shaped recording medium when the signals are recorded and regenerated by rotating the drum by installing an optical head in a drum and transmitting a recording and regenerating signal optically between the rotary drum and its outside. CONSTITUTION:The rotary drum 1 is rotated by a motor 5 and photodetectors which have annular light receiving surfaces are provided above the center of the drum concentrically around the rotary shaft of the drum 1 by as many as channels of the recording signal, thus forming a photodetector group 6. The light receiving surfaces of the photodetector group 6 which is installed opposite an optical fiber group 8 are irradiated with the beam of a semiconductor laser(LD) 7 which is turned on with the recording signal. The recording signal which is converted into an electric signal by the photodetector group 6 is recorded on the tape 2 by turning on the LD of an optical head 3 with an LD driving circuit 10.

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