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41. 发明专利

JPH02206040A OPTICAL DISK 失效
公开(公告)号：JPH02206040A
公开(公告)日：1990-08-15
申请号：JP2615989
申请日：1989-02-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIYOSE YASUHIRO , OZAKI MINORU , FURUKAWA TERUO , ARAI RYUICHIRO , NAKANE KAZUHIKO , SHIMAMOTO MASAMI
IPC分类号： G11B20/12 , G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/24 , G11B20/18
摘要： PURPOSE:To reproduce information using separately recorded correction data in accordance with map information at the time when a synchronous signal of a data part cannot be obtained by the normal reproducing operation because of a defect across plural tracks by using check data recorded in a prescribed position of a read-only area. CONSTITUTION:Information is recorded in a prescribed radial range of a recording plate 1 on an optical disk, and this recording part 1 is divided to prescribed sectors in the peripheral direction. A read-only area 2 where information is recorded with bits is provided on the inner peripheral side of the recording part 1, and a write area 3 with magnetic recording is formed on the outer peripheral side. Tracks are spirally provided at intervals of a prescribed length in the recording part 1, and information is recorded on tracks 4 or one-sector data areas between tracks. Sectors S0 to S21 in the area 2 consist of a header part SB and a data part SD, and error check data Cd0 to Cdn-1 are recorded in data areas of a 7nth track T7m to an (8n-1)th track Tan-1 of the 21st sector S21 of the data area of the data part SD.

42. 发明专利

JPH0287329A SIGNAL REGENERATING DEVICE 失效
公开(公告)号：JPH0287329A
公开(公告)日：1990-03-28
申请号：JP23951088
申请日：1988-09-24
申请人： MITSUBISHI ELECTRIC CORP
发明人： YANAGI JUNJI , FURUKAWA TERUO
IPC分类号： G11B7/00 , G11B7/005 , G11B7/13
摘要： PURPOSE:To prevent the detection mistake of a regenerative signal by providing a gain switching section switching a gain of a pre-stage circuit of an automatic gain control amplifier receiving a regenerative signal regenerated from a recording medium. CONSTITUTION:A filter circuit 1 eliminates noise at the outside of a required frequency band from an inputted regenerative signal S1 and an output signal S2 of the filter circuit 1 eliminating noise is inputted to a 1st stage amplifier 2. Moreover, the filter circuit 1 is connected to a gain switching circuit 9 being a gain switching section. An output signal 2a amplified by the 1st stage amplifier 2 is inputted to an automatic gain control AGC amplifier 4 via an attenuator circuit 3. The gain switching section increases the gain of the 1st stage amplifier of an AGC amplifier 4 when the information of the control track of a recording medium is reproduced. Thus, the amplitude of the regenerative signal regenerated from the control track of the recording medium with a small light reflectance is increased to prevent detection mistake of the regenerative signal.

43. 发明专利

JPH01243241A OPTICAL DISK AND OPTICAL DISK DRIVING DEVICE 失效
公开(公告)号：JPH01243241A
公开(公告)日：1989-09-27
申请号：JP7030888
申请日：1988-03-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO , ITO OSAMU
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/09 , G11B21/08
摘要： PURPOSE:To detect the travel direction of a head in performing an access operation, to prevent the runaway of the head from occurring, and to improve the resolution of track count by deciding a pit pattern in sequence decided in advance on an optical disk. CONSTITUTION:In the optical disk on which a pair of wobble pits, a clock pit, and an address pit are preformatted at a constant interval in a track direction, the address pit pattern of each track is constituted of a binary digital Dn {(n): relative track number, Dn: A(n, 1)-A(n, k)} of K digits, and is set as a cyclic code of N cycles (N>=8). Also, it is set as the code in which two or more digits of logic '1' exist in each Dn in a condition where two or more digits of '0' exist in that cycle. A device to drive the optical disk 11 constituted in such way consists of an optical head 12, an optical detector 13, a pre-amplifier 14, a speed detector 15, a direction detector 16, an inversion amplifier circuit 17, a velocity control circuit 19, and address pit pattern detector 20, etc.

44. 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.

45. 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.

46. 发明专利

JPS644943A RECORDING MEDIUM DRIVING DEVICE 失效
公开(公告)号：JPS644943A
公开(公告)日：1989-01-10
申请号：JP16034987
申请日：1987-06-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMAMOTO MASAMI , NAKANE KAZUHIKO , FURUKAWA TERUO
IPC分类号： G11B7/09 , G11B7/005 , G11B7/13 , G11B11/10 , G11B11/105 , G11B13/04 , G11B27/24
摘要： PURPOSE:To accurately realize the reproduction of information and to perform the switching of the polarity of a pit information reproducing signal and a magnetization information reproducing signal, by providing a pre-amplifier having a function to obtain a prescribed signal by first and second detectors and switching means, etc., and absorbing the fluctuation of a various kinds of parameters. CONSTITUTION:The first switching means 23 and 24 which select the execution of the addition amplification of the output signals S1 and S2 of the first and second detectors 9 and 19 with a constant gain K1, or that of the subtraction amplification with a constant gain K2 by a control signal, and the second switching means 25 and 26 which select uniquely the polarity of the addition amplification signal or the subtraction amplification signal by the control signal are provided. And a signal Vi decided by the first and second switching means 23-26 can be obtained. In the signal Vi, (i) represents 1-4, and equation I is established for V1-V4. In such a way, it is possible to amplify both the pit information reproducing signal and the magnetization information reproducing signal to constant levels with the same polarity in spite of the fluctuation of a various kinds of parameters of a laser power, etc.

47. 发明专利

JPS6221192B2 失效
公开(公告)号：JPS6221192B2
公开(公告)日：1987-05-11
申请号：JP3746979
申请日：1979-03-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO
IPC分类号： H03M7/00 , G11B5/09 , G11B20/14 , H03M7/14 , H04L25/49

48. 发明专利

JPS6233370A DATA RECORDING ERROR DETECTOR FOR OPTICAL DISC 失效
公开(公告)号：JPS6233370A
公开(公告)日：1987-02-13
申请号：JP17459885
申请日：1985-08-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO , FUJIO KAZUYOSHI , OZAKI MINORU
IPC分类号： G11B20/10 , G11B20/18
摘要： PURPOSE:To prevent generation of an abnormal clock by providing an error detection and correction means for detecting and correcting an error of a recording signal and a means for switching a range keeping synchronization with the recording signal of an automatic phase control circuit depending on the verified read time and the normal reproduction time. CONSTITUTION:When the response speed is fast, the titled device is sensitive to external noises and causes easily an abnormal clock. In increasing the natural frequency at the verify read time more than that at the normal reproduction time, the abnormal clock at the normal reproduction is prevented. Further, the inherent frequency is increased, then the synchronization keeping range is widened. Thus, a switch 22 in an automatic phase control circuit 17 is changed over to be connected to a capacitor C2 at the reproduction or a switch 23 is clanged over to the position of a resistor R4, then the range of keeping the inherent frequency and the synchronization is widened and the circuit 17 is more sensitive to noise due to decentering an optical disc 8 or noise due to aging deterioration of the optical disc 8 than that at the normal reproduction. Thus, the abnormal clock is prevented and the probability of mis-reproduction is minimized.

49. 发明专利

JPS60248025A BINARY DATA CONVERTING AND DECODING SYSTEM 失效
公开(公告)号：JPS60248025A
公开(公告)日：1985-12-07
申请号：JP10675084
申请日：1984-05-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO
IPC分类号： H03M5/04 , G11B20/14
摘要： PURPOSE:To reduce the hardware of an NRZ system coding system with excellent capability by converting a binary data string into a code string where an NRZ code and an NRZI code are mixed in converting the binary data string into a prescribed transmission line code string. CONSTITUTION:In converting original data 8 bits into a 10-bit code string, for example, an original signal inputted to a terminal 1 is converted into an 8-bit data by a serial/parallel shift register 2. An output of the register 2 is converted into a 10-bit code by a pattern converting section 4, and in this case, the code logics 1, 0 of the head bit are converted into an NRZ code having logical 1, 0 and the remaining 9 bits are converted into a converted X code string of an NRZI code having a logic inverted by a code logic 1. The code string and the inverted back pattern are switched for the head bit only by a changeover SW5, latched by one block section at a delay 6, become serial data by a parallel/serial shift register, become a desired NRZ code string by a converter 15 and outputted to a terminal 9. A latched signal enters a CDS integrated value 7 to control the next pattern changeover SW5.

50. 发明专利

JPS60223003A VERTICAL MAGNETIC SIGNAL PROCESSING SYSTEM 失效
公开(公告)号：JPS60223003A
公开(公告)日：1985-11-07
申请号：JP7663984
申请日：1984-04-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： FURUKAWA TERUO , NISHIMURA MASARU
IPC分类号： G11B5/02 , G11B5/127 , G11B5/187 , G11B5/265 , G11B5/48 , G11B5/58
摘要： PURPOSE:To reduce the crosstalk and also to improve the track density by decreasing both the width and the thickness of a track of the 1st main magnetic pole in the width and the traveling directions of said track respectively in comparison with those of a track of the 2nd magnetic pole. CONSTITUTION:A tracking signal of a low frequency is recorded in the track width direction of an SP head H by the 2nd magnetic pole 2a having large width. While a main signal of a high frequency is recorded to tracks 3a, 3b,... respectively by the 1st main magnetic pole 1a. Then an end or both ends 5a, 5b,... of tracks 3a, 3b,... where the main signal is recorded are erased by the tracking signal. This eliminates a gurd band as well as the effect of the crosstalk. At the same time, the lengthwise thickness of the track of the pole 2a is increased. As a result, no main signal is reproduced on a track by the pole 2a and only the tracking signal can be reproduced when the information recorded on a track is reproduced.

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