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公开(公告)号：JPH10112033A
公开(公告)日：1998-04-28
申请号：JP28323896
申请日：1996-10-04
Applicant: SONY CORP
Inventor： HORIGOME HIDEYOSHI , HIDA MINORU , FUJITA GORO , TOSAKA SUSUMU
Abstract: PROBLEM TO BE SOLVED: To provide a high-density recording medium by alternately forming two circulating tracks whose data areas are on the land and the groove at each circulating track and using both the land and the groove as recording track. SOLUTION: Grooves GBs and lands LDs are formed so that they appear alternately at each circulation. The black portion of a service area ARs is a service pit and formed between recording/reproducing scanning loci SSPRs. The shaded portion of the data area ARd is the data track formed by a groove GB and unshaded portions are data tracks formed by lands LDs. Recording/ reproducing scanning by a laser scanning spot LSP is spirally performed in the solid arrow direction along the locus SSPR. By this, in comparison with the case where either one of the land LD and groove GB is used as data track, high density recording twice as high is realized.
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公开(公告)号：JPH08273161A
公开(公告)日：1996-10-18
申请号：JP7369895
申请日：1995-03-30
Applicant: SONY CORP
Inventor： OTSUKA GAKUSHI , FUJITA GORO , HIDA MINORU
Abstract: PURPOSE: To improve the memory capacity over the entire part by recording reference patterns to be used as a reference at the time of reproducing of recording data in recording and reproducing regions. CONSTITUTION: The exact specification of writing positions in a ROM region is made possible by press accuracy in the case only the tops of the respective zones of the RAM regions are provided with the reference regions where 2T patterns and 8t patterns are recorded and, therefore, the 2T patterns and 8T patterns may be omitted as shown in Fig. (b). The useless recording regions are thus omitted as compared with the case the tops of the respective sectors are provided with the reference regions in the RAM region as well. The storage capacity of the optical disk is correspondingly improved. Only the top of the RAM region may be provided with the reference region as shown in Fig. (c) and in such a case, the useless recording regions of the RAM region are omitted and further, the storage capacity of the optical disk is improved.
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公开(公告)号：JPH07334929A
公开(公告)日：1995-12-22
申请号：JP15258994
申请日：1994-06-10
Applicant: SONY CORP
Inventor： NAKAO SHINICHI , KOBAYASHI SHOEI , HIDA MINORU
IPC: G11B20/10
Abstract: PURPOSE:To surely detect data even when the area for detecting the DC level of a disk-shaped recording medium is defective by causing a DC voltage correction circuit to hold just the voltage value sample-held in the previous period. CONSTITUTION:When the area CL for detecting the DC level of a disk-shaped recording medium 11 has one or more defects DF, a DC voltage correction circuit 50 holds just the voltage value sample-held in the previous period to output it as a DC level S31. As the results, a second reproducing signal S16 is obtained by detecting and correcting the fluctuations of a first reproduced signal S10 based on the results of difference between the DC level S31 and the first reproduced signal S10 and thereby data is reliably reproduced.
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公开(公告)号：JPH06150578A
公开(公告)日：1994-05-31
申请号：JP31658092
申请日：1992-10-30
Applicant: SONY CORP
Inventor： FUJITA GORO , HIDA MINORU
Abstract: PURPOSE:To surely and simply detect information by selecting a most likely data group based on information in the state of the transition of an RF signal by a viterbi decoding method even when the asymmetry amount is fluctuated due to the fluctuation of write power. CONSTITUTION:An asymmetry amount is detected with a digital RF signal in a reference area on an optical disk 3 based on a timing signal from a timing generator by an asymmetry detection circuit 16. The digital RF signal is demodulated with a viterbi decoding method by a viterbi detection circuit 17 based on the asymmetry amount detected by the asymmetry detection circuit 16.
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公开(公告)号：JPH05225683A
公开(公告)日：1993-09-03
申请号：JP2870992
申请日：1992-02-17
Applicant: SONY CORP
Inventor： HIDA MINORU
Abstract: PURPOSE:To easily change a control program for the controlling unit of the disk player without necessitating drastic modification of the disk player and a high cost. CONSTITUTION:A program changing disk DSK recording a changed program is loaded on the disk player provided with a control unit 30 for controlling various operations accompanied by a writable/readable memory 32 storing controlling programs for them and an information reproducing operation state is taken based on an operation control by the controlling unit 30. Then, after the loading of the program changing disk DSK on the controlling unit 30 is confirmed, the changed program reproduced from the program changing disk DSK is written by the writable/readable memory 32 and thus, the control program for the controlling unit 30 is changed.
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Patent Agency Ranking
公开(公告)号：JPH0554391A
公开(公告)日：1993-03-05
申请号：JP23571891
申请日：1991-08-23
Applicant: SONY CORP
Inventor： FUJITA GORO , HIDA MINORU
Abstract: PURPOSE:To realize an accurate multivalue detection operation independent of the level and amplitude fluctuation of a regenerative signal. CONSTITUTION:The multivalue data is detected by comparing the signal level data obtained by the A/D conversion of the regenerative signal with the threshold value. The output of an A/D converter 7 is stored in a memory means 10, and a threshold value to be used for the multivalue is set based on the distribution information of the signal level data.
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公开(公告)号：JPH056623A
公开(公告)日：1993-01-14
申请号：JP18362691
申请日：1991-06-28
Applicant: SONY CORP
Inventor： WATANABE SATORU , YAMAGAMI TAMOTSU , HIDA MINORU , NAGARA TORU
IPC: G11B11/10 , G11B11/105 , G11B20/10
Abstract: PURPOSE:To make it possible to judge the logics of multiple values by accurately imparting the magnetic field of an N pole or an S pole into a magneto-optical disk in response to a recording signal and forming a mark corresponding to the N pole. CONSTITUTION:When the magnetic field of an N pole or an S pole is imparted from a magnetic head 35 in response to a recording signal, the mark corresponding to the magnetic field is formed on a magneto-optical disk 31. Different from an optical modulating method, recording operation is positively performed on the magneto-optical disk 31 not only for recording the logic 1 but also for recording the logic 0. Namely, the logic 0 is not recording by not recording the logic 1 after the logic 1 has been recorded, but a part of the logic 1 is erased and then the logic 0 is recorded. In this way, the logic of multiple values can be accurately judged in a partial response method.
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公开(公告)号：JPH04155662A
公开(公告)日：1992-05-28
申请号：JP27892290
申请日：1990-10-19
Applicant: SONY CORP
Inventor： HIDA MINORU
Abstract: PURPOSE:To increase recording capacity without increasing the scale of circuit by continuously recording address and data in data area with substantially constant line recording density. CONSTITUTION:In a recording medium 10, servo areas As and data areas Ad are disposed alternately along the rotational direction of disc, i.e. the direction of recording track, where a single area As and an area Ad adjacent thereto constitute a single segment SG. Each area As is previously arranged radially from the center of rotation Ro of a disc. An address such as so-called sector mark or a track address and predetermined number of data DA are recorded continuously using a predetermined channel clock obtained based on clock information of the area As. Reference and data are recorded continuously with substantially uniform line density in the area As, regardless of the track position, using the predetermined channel clock.
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公开(公告)号：JPH02297776A
公开(公告)日：1990-12-10
申请号：JP11928889
申请日：1989-05-12
Applicant: SONY CORP
Inventor： HIDA MINORU
IPC: G11B20/14
Abstract: PURPOSE:To obtain a data phase compensating circuit which has the high phase compensating accuracy together with its scale to be miniaturized and receives no influence of the temperature characteristic, the delay value, etc., by performing no control of an original channel clock if a reference bit has a defect or is not recorded yet. CONSTITUTION:A read-out reproduction signal is sampled by an A/D converter 2 with use of a channel clock, and a reference bit part is detected out of the sampled reproduction signal. A phase detecting circuit 3 detects a phase error of the channel clock to the reference bit part. Then the phase of an original channel clock is controlled based on the detected phase error for compensation of the phases of the channel clock and the reproduction signal. Meanwhile the original channel clock is not controlled if a reference bit has a defect or is not recorded yet. Thus it is possible to obtain a data phase compensating circuit which has the high phase compensating accuracy together with its scale to be miniaturized and receives no influence of the temperature characteristic, the delay value, etc.
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公开(公告)号：JPH02288732A
公开(公告)日：1990-11-28
申请号：JP11116389
申请日：1989-04-28
Applicant: SONY CORP
Inventor： HIDA MINORU
Abstract: PURPOSE:To decrease the circuit scale by applying modulation in compliance with the modulation rule corresponding to one and other mark numbers of digital data split into two while one of the digital data split into two corresponds to a low order of a modulation code and the other corresponds to a high order. CONSTITUTION:A 1 byte digital data is split into a high order 4-bit MSN and a low order 4-bit LSN, data bits b0-b3 are transferred to channel bits Ch1-Ch4 and data bits b4-b7 are transferred to channel bits Ch6-Ch9. Channel bits Ch0, Ch5 are used for flags applying inversion/noninversion according to the modulation rule and a channel bit Ch10 is used for matching mark number in a modulation code. When a digital data is converted into a modulation code by a gate circuit, since the modulation rule is simple, the gate number is considerably saved and the circuit integration is facilitated.
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