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1. 发明专利

JP2002334464A LIGHT PICKUP WITH TILT DETECTION FUNCTION 失效
公开(公告)号：JP2002334464A
公开(公告)日：2002-11-22
申请号：JP2001142858
申请日：2001-05-14
申请人： KENWOOD CORP , JAPAN BROADCASTING CORP
发明人： TOKIWA KAZUNORI , ABE KAZUNARI , HIRAGA TAKAYOSHI , MIYAZAWA HIROSHI , TOKUMARU HARUKI , SHIMIZU NAOKI , YANAGISAWA HITOSHI , KOIDE DAIICHI
IPC分类号： G11B7/095 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To accurately detect the tilt of a signal face which is being recorded or reproduced. SOLUTION: A main laser beam ML generated for recording or reproducing is guided with a main optical system 27 and the signal face 12 of a light disk 1 is irradiated with the laser beam through an objective lens 25. A sub laser beam SL generated for detecting the tilt of the light disk is guided with a sub optical system 55 and condensed at defocus on the signal face 12 through the objective lens 25 while being superimposed with the main laser beam ML. A returning laser beam SL' reflected on the signal face 12 is guided with the sub optical system 55 and condensed on a tetrameric photodetector 60 for detecting the tilt of the light disk with a condensor lens 54. In the case that the optical disk 1 is tilted based on the optical axis of the objective lens 25 looking toward the radial direction, a deviation in the returning laser beam SL' occurs, a difference appears between the total receiving amount of the photodetectors A and D of the tetrameric photodetector 60 and the total receiving amount of the photodetectors B and C, thus a tilt detection signal looking toward the radial direction is made from the output of the light detection of the tetrameric photodetector 60.

2. 发明专利

JP2003257028A METHOD AND DEVICE FOR RECORDING OPTICAL INFORMATION AND OPTICAL INFORMATION RECORDING MEDIUM 审中-公开
公开(公告)号：JP2003257028A
公开(公告)日：2003-09-12
申请号：JP2002053968
申请日：2002-02-28
申请人： JAPAN BROADCASTING CORP
发明人： ISHII NORIHIKO , SHIMIZU NAOKI , TOKUMARU HARUKI
IPC分类号： B41M5/26 , G11B7/0045 , G11B7/125 , G11B7/24 , G11B7/243
摘要： PROBLEM TO BE SOLVED: To provide a method and a device for recording optical information capable of easily deciding an optimal recording compensation value to prevent thermal interferences even when information recording is carried out at a very high density. SOLUTION: A multipulse string constituted of the repetition of a mark and space which has a time length equivalent to one of combinations of mark lengths to be recorded and previous space lengths is trial-written on an optical information recording medium, optimal recording pulse conditions are decided for the combination from its reproducing signal and, for the other combination of the mark lengths to be recorded and the previous space lengths, recording pulse conditions are uniquely decided by utilizing the fact that heat diffusion by recording is decided only by the horizontal heat conductivity of a recording film. COPYRIGHT: (C)2003,JPO

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

JPH10199008A MULTIBEAM OPTICAL HEAD 失效
公开(公告)号：JPH10199008A
公开(公告)日：1998-07-31
申请号：JP164797
申请日：1997-01-08
申请人： JAPAN BROADCASTING CORP
发明人： OKUMURA HIDEYO , TOKUMARU HARUKI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To make light beam emitting intervals very small and to enable a high speed recording and reproducing in a high density without enlarging the device constitution by arranging emitting beams of laser diodes at minute intervals. SOLUTION: This multibeam optical head for simultaneously recording and reproducing plural bits of information on a recording medium is equipped with plural laser diodes 1 for emitting their source becomes and optical fibers 8 installed in the same number as these plural laser diodes to be used as a light guide path for beams emitted from the laser diodes respectively. Emitting ends of the optical fibers 8 are arranged at equal intervals on a straight line by a processed substrate 9.

5. 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

6. 发明专利

JPH0291818A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0291818A
公开(公告)日：1990-03-30
申请号：JP24236088
申请日：1988-09-29
申请人： JAPAN BROADCASTING CORP
发明人： TOKUMARU HARUKI
IPC分类号： G11B7/00 , G11B7/0045
摘要： PURPOSE:To make the S/N ratio of a reproducing signal excellent and to reduce the distortion of waveform by previously setting the radius of an optical disk which rotates at a constant angular velocity and an optimum duty ratio in an environmental temperature and controlling a recording signal. CONSTITUTION:Data on the optimum duty ratio corresponding to the position of radius in each environmental temperature under which the optical disk device is used is previously obtained and stored in a ROM 11. The environmental temperature at the time of recording and the position of the radius of the disk are detected by a temperature sensor 9 and a disk radius position sensor 7 and transferred to a CPU 5 through A/D converters 8 and 10. According to the transferred data, the CPU 5 reads out the duty ratio in which the distortion of waveform is minimum from the ROM 11 and inputs it in a comparator 2. An output from the comparator 2 is inputted in a duty ratio detection circuit 3 and the detection output from the circuit 3 is supplied to the CPU 5, where it is compared with the data on the duty ratio from the ROM 11, and the compared result is returned to the comparator 2 to control the duty ratio. The duty ratio of the actual recording signal is controlled to be equal to the optimum value, whereas the S/N ratio of the reproducing signal is made excellent.

7. 发明专利

JPH01100755A MAGNETO-OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01100755A
公开(公告)日：1989-04-19
申请号：JP25729387
申请日：1987-10-14
申请人： JAPAN BROADCASTING CORP
发明人： TOKUMARU HARUKI , NOMURA TATSUO , TAI KAZUHIKO
IPC分类号： G11B11/10 , G11B7/085 , G11B11/105
摘要： PURPOSE:To realize recording and reproduction with high density by arranging an objective lens between the light reflecting plane of a rotary polygonal mirror and a magneto-optical recording medium, and enabling the magneto-optical recording medium to be scanned by a convergent spot. CONSTITUTION:A tape shape recording medium 1 is the one is which a magneto- optical recording material layer of Tb-Fe and Tb-Fe-Co, etc., is provided on a resin film with low rigidity and with heat resistance by vapor-deposition or sputtering, and a guide groove for tracking is formed, and it is wound on a supplying reel 13. Laser beams emitted from a fixed optical system A2 and a fixed optical system B3 arranged oppositely to the side of the tape shape recording medium 1 are reflected on the rotary polygonal mirror 6, and each of them is made incident on actuators 4 and 5 incorporating the objective lenses, respectively, and is converged on the recording medium 1, then, it is recorded or reproduced. The actuators 4 and 5 are supported by brackets extending from the fixed optical systems A and B, respectively, and perform a focusing or a tracking function by moving the objective lens. In such a way, it is possible to perform the recording with high density.

8. 发明专利

JPH11144298A MULTIBEAM OPTICAL HEAD AND OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH11144298A
公开(公告)日：1999-05-28
申请号：JP31207797
申请日：1997-11-13
申请人： JAPAN BROADCASTING CORP
发明人： OKUMURA HIDEYO , TOKUMARU HARUKI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To perform a high speed recording and reproduction with high density by arranging outgoing beams of laser diodes in a fine interval to make the interval between light spots fine to be the same interval as a track pitch without making the size of the whole of a device larger. SOLUTION: Plural light beams are made to be generated by plural laser doides 1 and, also, the interval between light beams to be outputted from an optical guidewave 3 is made fine by guiding the beams into respective input ports of a waveguide pattern in which the interval between respective output ports is made fine while monitoring intensities of respective light beams with a coupling optical system 2. Moreover, light beams to be emitted from the optical waveguide 3 are taken in by an optical head system 11 to be respectively converged on a recording medium 12.

9. 发明专利

JPH06243474A RECORDING, REPRODUCING AND TRACKING METHODS FOR OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH06243474A
公开(公告)日：1994-09-02
申请号：JP3152493
申请日：1993-02-22
申请人： JAPAN BROADCASTING CORP
发明人： OGAWA KAZUTO , TOKUMARU HARUKI
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/005 , G11B7/09
摘要： PURPOSE:To accurately detect signals and to improve recording density even though adjacent tracks are made closet to each other by performing mark recording while aligning recording mark positions in a track vertical direction. CONSTITUTION:When a mark Dj+1,i+1 is to be detected, tracking control is performed so that the center of reproducing light spot 2 scans the boundary position of two adjacent tracks DTvi and DTvi+1 and the value of a mark Dj+1,i+1 is discriminated by using a reproduced waveform Rsj+1,i+1 level which is obtained when the center position of the spot 2 reaches to the boundary of two recording positions Dpi,i and Dpi+1,i formed on the track DTvi and the boundary of two recordinh positions Dpi,i+1 and Dpj+1,i+1 formed on the other track DTvi+1 and the already obtained value of marks Dj+1, Dj+1,i and Dj,i+1. Thus, while the track pitch is made smaller than 1/2 of the current pitch, the recording density is improved to more than twice the current density.

10. 发明专利

JPH06215407A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH06215407A
公开(公告)日：1994-08-05
申请号：JP801893
申请日：1993-01-21
申请人： ASAHI OPTICAL CO LTD , JAPAN BROADCASTING CORP
发明人： TOKUMARU HARUKI , MARUYAMA KOICHI , WAKAMIYA SHUNICHIRO
IPC分类号： G11B7/135
摘要： PURPOSE:To prevent the change of intervals of plural spots formed on a recording medium by providing a relay lens having prescribed conjugate function between a collimator lens as a focusing lens and an objective lens. CONSTITUTION:Plural beams emitted from a semiconductor laser 1 are made parallel light beams by means of a collimator lens 2 as a focusing lens, respectively, and transmitted through a beam splitter 3. By assuming that the distance from the position of the light source made incident on the lens 2 to the front principal point of the lens 2 is dx, the light beam transmitted through the beam splitter 3 is relayed by relay lenses 4, 5 having the function for making the point the distance dx apart from the rear principal point of the lens 2 on the side of an objective lens 7 and the front focus of the lens 7 almost conjugate. By this constitution, even when the collimator lens 2 except the objective lens 7 is moved in the direction of the optical axis in order to focus, the change of an image forming magnification is suppressed and the change of the spot interval is prevented.

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