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61. 发明专利

JPH03156756A INFORMATION RECORDING METHOD FOR MAGNETO-OPTICAL RECORDING INFORMATION MEDIUM 失效
公开(公告)号：JPH03156756A
公开(公告)日：1991-07-04
申请号：JP30427589
申请日：1989-11-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： TAKEUCHI KOICHI , ITO OSAMU , YOSHIMOTO KYOSUKE , TANAKA KUNIMARO , WATANABE SEIO , TSUTSUMI KAZUHIKO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To prevent mis-recognition of a signal due to recording left unerased in the case of overwriting information on the existing information by recording information while selecting a width of a light beam with a smaller intensity in that of light beams to be a width being the sum of the land width of a track and a width due to a maximum error in terms of the position control of the light beam with respect to the center of the track or over. CONSTITUTION:The information is overwritten onto the existing information by selecting the width of a mark formed by a light beam with a smaller output in light beams of 2 kinds of intensity used for recording information to be the sum of the width of a land 52 of a track and a width due to a maximum error of position control of the light beam with respect to the center 58 of the track or over, that is, a maximum width 59 of the track offset or over. Thus, even when a track offset takes place in the case of overwrite, since the mark by the light beam of a smaller output is formed to the entire range of the land 52 of the track, the mark recorded on the land 52 precedingly is completely overwritten. Thus, the recording left unerased is not entirely caused to the land 52, then no mis-recognition in the readout of the information is not caused.

62. 发明专利

JPH02312071A OPTICAL RECORDING SYSTEM 失效
公开(公告)号：JPH02312071A
公开(公告)日：1990-12-27
申请号：JP13320589
申请日：1989-05-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIYOSE YASUHIRO , OZAKI MINORU , TANAKA KUNIMARO , ITO OSAMU
IPC分类号： G11B20/18
摘要： PURPOSE:To reduce a load that data is rewritten by distributively recording the data on plural optical disks and simultaneously recording the inspection symbol of an error correction code on a part of the optical disks. CONSTITUTION:A host computer 3 gives the data which should be recorded to a controller 2 and instructs the reproduction of the data, besides. Then, the controller 2 distributively gives the data to the driving devices 11 - 20 of the optical disks 4 to execute recording and reproducing. A number recording area 4b is provided to the disk 4. On the disk 4 of the number which is recorded on the area 4b, the inspection symbol of the error correction code generated by the data of the other disks 4 is recorded. The loaded driving devices 11 - 20 are specified by the reproduced data of the disk 4 where the inspection symbol and an inspection symbol generation rule are recorded. Thus, the driving devices 11 - 20 are operated without hindrance and the load that the data is rewritten is reduced.

63. 发明专利

JPH0157426B2 失效
公开(公告)号：JPH0157426B2
公开(公告)日：1989-12-05
申请号：JP1941181
申请日：1981-02-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： OZAKI MINORU , TANAKA KUNIMARO
IPC分类号： H04B1/10 , G11B20/18 , H04B14/04

64. 发明专利

JPH01223637A SIGNAL DECODING SYSTEM 失效
公开(公告)号：JPH01223637A
公开(公告)日：1989-09-06
申请号：JP5013888
申请日：1988-03-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO , ITO OSAMU , TANAKA KUNIMARO , OGAWA MASAHARU , YOSHIMOTO KYOSUKE , OTOTAKE MASABUMI
IPC分类号： G11B20/14 , G11B7/00 , G11B7/005 , G11B11/10 , G11B11/105
摘要： PURPOSE:To correct a phase shift of a recording and reproducing clock and a reproduction detecting signal by decoding a reproducing signal of a recording bit and a pre-format bit by the same decoder through delaying circuits in which each delay quantity is different. CONSTITUTION:A reproduction detecting signal is inputted to a terminal 50, becomes prescribed pulse width by a pulse generator 51, inputted to a DL line 52 of delay quantity tau of the minimum tap interval, and signals O1-O8 which are delayed by tau each are obtained. This signal is inputted to a counter 53, and counted up when a clock signal is inputted and only when O1-O8 are in an H level, and a deciding circuit 56 is a circuit for deciding an output value of each counter, and outputs a code of 3 bits for showing its input line. This deciding code is latched by a latching circuit 57, and by a selector 59, a DL line signal whose phase error goes to minimum is outputted. By using this phase correcting device, a recording and reproducing CK and its phase can be corrected.

65. 发明专利

JPH01223635A OPTICAL DISK AND OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JPH01223635A
公开(公告)日：1989-09-06
申请号：JP5013988
申请日：1988-03-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： ITO OSAMU , OGAWA MASAHARU , YOSHIMOTO KYOSUKE , TANAKA KUNIMARO , FURUKAWA TERUO , OTOTAKE MASABUMI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/085 , G11B7/24
摘要： PURPOSE:To improve the resolution of a track count by placing a bit position in a position of >=two stages against a reference position and placing independently an even field and an odd field at every information track of one piece or more. CONSTITUTION:Even servo-fields 1, 2, 3 and 4 and odd servo-fields 6, 7, 8 and 9 constitute a pair of wobble pits, and each pit is deviated a little from the track center axis. Clock pits 5, 10 are placed on the track center axis, go to a clock reference of recorded information data, and also, go to a reference for generating a sampling pulse of the wobble pit. Timing positions based on the clock pits 5, 10 of the wobble pits 1 and 6, 2 and 7, 3 and 8, and 4 and 9 as a reference are denoted as (a), (b), (c) and (d), respectively. A servo-field structure in which the pit exists in the timing position (a) is shown as A or alphaas shown in the figure, and in the same way, (b), (c) and (d) are shown as B or beta, C or gamma, and D or delta, respectively. In such a way, the detection can be detected in the course of an access operation.

66. 发明专利

JPH01189039A OPTICAL INFORMATION RECORDING CARRIER 失效
公开(公告)号：JPH01189039A
公开(公告)日：1989-07-28
申请号：JP1079088
申请日：1988-01-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAJIMA HAJIME , WATANABE SEIO , TANAKA KUNIMARO
IPC分类号： G11B11/10 , G11B7/007 , G11B7/013 , G11B7/24 , G11B11/105
摘要： PURPOSE:To stop the spread of information bits with the wall surface of guide grooves and to suppress generation of crosstalks by increasing the geometric depth of the guide grooves to a specific value and steepening the inclination of the wall surfaces of said grooves. CONSTITUTION:The guide grooves 5 for detecting the deviation of a microspot from the center of information recording tracks 4 are formed on the surface of a substrate 1 and an information recording medium 2 is formed by vapor deposition, etc., on the surface of the substrate 1. The depth of the grooves 5 in the case of an information recording carrier which is transparent in the substrate material on the side to be irradiated with light and has a refractive index (n) is confined to (2N+1)lambda/8n (N=1, 2..., lambda is the wavelength of the irradiation light). The wall surfaces 5a of the grooves 5 are formed to the steepened angle of inclination and the medium 2 is interrupted at the wall surfaces 5a and, therefore, heat transmission stops at the wall surfaces 5a. The edges in the tracking direction of the recording bits are limited by the grooves 5 in such a manner, by which the generation of the crosstalks by an increase in the recording bits is obviated and the larger margin for the power of the recording laser is taken.

67. 发明专利

JPS6449137A MULTIPLEX RECORDING AND REPRODUCING DEVICE BASED ON OPTICAL WAVELENGTH 失效
公开(公告)号：JPS6449137A
公开(公告)日：1989-02-23
申请号：JP20688987
申请日：1987-08-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKANE KAZUHIKO , TANAKA KUNIMARO , YOSHIMOTO KYOSUKE , YOSHIMURA MOTOMU , MAEDA MITSUO
IPC分类号： G11B7/125 , G11B7/00 , G11B7/004 , G11B7/20
摘要： PURPOSE:To stabilize a recording wavelength and to increase recording capacity by recording wavelength checking information by means of a reference wavelength and controlling the oscillation frequency of a laser beam to be emitted at the time of recording/reproducing so as to allow it to coincide with the reference wavelength. CONSTITUTION:A light emitting spectrum of a semiconductor laser goes to an uncontinuous longitudinal mode wavelength with a fixed interval in accordance with the increment of an injection current. Recording, reproducing and tracking are executed in accordance with the uncontinuous wavelength. At that time, 8-bit wavelength checking information is recorded in a header area of each sector on a track by means of the recording/reproducing wavelength. At the time of recording/reproducing, a wavelength pattern detecting/collating circuit 71 compares inputs lambda1-lambda8 with the wavelength checking information based upon the reference frequency recorded in a ROM 72. The output of the circuit 71 controls the injection current, i.e. the wavelength, of the semiconductor laser through an injection current pattern generating circuit 73 and a D/A converter 74. Consequently, the wavelength to be used for multiplex recording can be stabilized and the storage capacity of information can be increased.

68. 发明专利

JPS63275042A OPTICAL DISK 失效
公开(公告)号：JPS63275042A
公开(公告)日：1988-11-11
申请号：JP11120887
申请日：1987-05-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： TANAKA KUNIMARO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/24
摘要： PURPOSE:To improve the S/N of a reproducing signal by recording a data representing the property of a recording medium in a form of a pit longer in the track direction of the recording medium according to the phase encode modulation rule and in a form of phase pit. CONSTITUTION:In recording a data representing the property of a recording medium onto a control track, it is recorded by the modulation system of phase encode in a form of a pit longer in a direction of a control track. That is, servo byte 1 and a long hole pit 2 are recorded on the control track in the sample servo according to the modulation system of phase encode. In case of the sample servo, it differs from the continuous servo, since the generation of a tracking error signal is according to a wobble pit, even it a Phase Encoded part (PEP) is a long hole, no effect is given onto the tracking servo. The reproducing amplitude of the reproducing signal obtained by reproducing the control track formed in this way is remarkably larger and the S/N is improved.

69. 发明专利

JPS6217314B2 失效
公开(公告)号：JPS6217314B2
公开(公告)日：1987-04-16
申请号：JP5567980
申请日：1980-04-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： TANAKA KUNIMARO , OZAKI MINORU
IPC分类号： H03M13/00 , G11B20/10 , G11B20/18 , G11B27/02 , G11B27/029 , G11B27/036 , H03M13/27

70. 发明专利

JPS6049963B2 失效
公开(公告)号：JPS6049963B2
公开(公告)日：1985-11-06
申请号：JP10094477
申请日：1977-08-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： TANAKA KUNIMARO , OONISHI TAKESHI
IPC分类号： G11B15/087 , G11B5/09 , G11B15/02 , G11B20/10 , G11B27/02 , G11B27/28

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