Inventor · disambiguated record
Toshiaki Tsuyoshi
Also filed as: TSUYOSHI TOSHIAKI
35 granted patents·966 citations·filing 1982–2006
98Inventor score
Technology areasG11B
Top patents by PatentIndex Score
35 records- 0198US4866688AComposite tracking servo system for optical disc apparatus with track offset correctionHITACHI LTD·Filed 1986·Granted Sep 12, 1989·111 cites·20 claims
- 0298US4748609AMethod and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offsetHITACHI LTD·Filed 1986·Granted May 31, 1988·119 cites·21 claims
- 0397US4707816AMethod and apparatus for composite wobbled and push-pull tracking servo systemHITACHI LTD·Filed 1986·Granted Nov 17, 1987·98 cites·13 claims
- 0495US7394607B2Disk drive with position detectionHITACHI GLOBAL STORAGE TECH·Filed 2006·Granted Jul 1, 2008·24 cites·20 claims
- 0595US5959943AInformation recording medium with clock information thereinHITACHI LTD·Filed 1997·Granted Sep 28, 1999·69 cites·2 claims
- 0694US5193034AMagnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic diskHITACHI LTD·Filed 1990·Granted Mar 9, 1993·75 cites·20 claims
- 0791US5218599AMethod of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the methodHITACHI LTD·Filed 1989·Granted Jun 8, 1993·46 cites·18 claims
- 0889US4785442ALight spot position control system and method by sampling servoHITACHI LTD·Filed 1987·Granted Nov 15, 1988·38 cites·7 claims
- 0987US4564929AInformation recording and reproducing apparatus with tracking control by samplingHITACHI LTD·Filed 1982·Granted Jan 14, 1986·30 cites·14 claims
- 1086US5367411AMagnetic recording and reproducing apparatus with reproducing head of magnetoresistive type having control of magnetic bias levelHITACHI LTD·Filed 1992·Granted Nov 22, 1994·40 cites·10 claims
- 1185US4703408AApparatus and record carrier for optically writing informationHITACHI LTD·Filed 1984·Granted Oct 27, 1987·27 cites·20 claims
- 1280US4748611AInformation recording medium and method for reproducing the sameHITACHI LTD·Filed 1986·Granted May 31, 1988·29 cites·2 claims
- 1378US5719719AMagnetic disk drive with sensing current adjustment of MR headHITACHI LTD·Filed 1994·Granted Feb 17, 1998·26 cites·16 claims
- 1478US4949325AMethod and associated apparatus and medium for optical recording and reproducing informationHITACHI LTD·Filed 1988·Granted Aug 14, 1990·22 cites·13 claims
- 1577US5715110AMagnetic recording and reproducing apparatus with thermal asperity correctionHITACHI LTD·Filed 1994·Granted Feb 3, 1998·26 cites·6 claims
- 1677US5170383AMagneto-optical data recording systemHITACHI LTD·Filed 1989·Granted Dec 8, 1992·13 cites·23 claims
- 1774US5132854AHigh speed seek sector servo magnetic disk drive unitHITACHI LTD·Filed 1989·Granted Jul 21, 1992·19 cites·9 claims
- 1874US4872152ALight spot position control system and method by sampled servoHITACHI LTD·Filed 1987·Granted Oct 3, 1989·18 cites·8 claims
- 1970US5657176AMethod and apparatus for optimizing the recording and reproducing of information from magnetic disksHITACHI LTD·Filed 1995·Granted Aug 12, 1997·22 cites·3 claims
- 2067US4796246AMethod and apparatus for beam-track alignment in optical disk apparatusHITACHI LTD·Filed 1986·Granted Jan 3, 1989·19 cites·10 claims
- 2161US4504937AOptical information tracking apparatusHITACHI LTD·Filed 1982·Granted Mar 12, 1985·11 cites·7 claims
- 2259US5473581AMagneto-optical data recording system continuously irradiating optical pulsersHITACHI LTD·Filed 1992·Granted Dec 5, 1995·7 cites·15 claims
- 2358US5337198ADigital magnetic writing and reading apparatusHITACHI LTD·Filed 1992·Granted Aug 9, 1994·12 cites·15 claims
- 2458US4710909APhase compensation apparatus for an optical information recording and reproducing systemHITACHI LTD·Filed 1985·Granted Dec 1, 1987·11 cites·9 claims
- 2556US5430581AMethod and apparatus for optimizing the recording and reproducing of information from magnetic disksHITACHI LTD·Filed 1992·Granted Jul 4, 1995·11 cites·13 claims
- 2656US5083226AMagnetic disk driveHITACHI LTD·Filed 1989·Granted Jan 21, 1992·9 cites·19 claims
- 2753US5572379AMagnetic recording drive having arrangements for average useful life of magnetorestive effects sensorsHITACHI LTD·Filed 1994·Granted Nov 5, 1996·6 cites·8 claims
- 2853US4541082ADevice for optically tracking informationHITACHI LTD·Filed 1982·Granted Sep 10, 1985·8 cites·10 claims
- 2947US5726955AMagneto optical recording medium apparatus and method utilizing light pulse magnetic modulation recordingHITACHI LTD·Filed 1996·Granted Mar 10, 1998·4 cites·9 claims
- 3045US5953178AMagnetic disk apparatusHITACHI LTD·Filed 1997·Granted Sep 14, 1999·7 cites·10 claims
- 3144US5886958AInformation recording apparatus and method for modulated magneto-optical recording mediumHITACHI LTD·Filed 1997·Granted Mar 23, 1999·3 cites·10 claims
- 3239US5579292AMagneto-optical data recording apparatus using a sample-servo system for applying heating pulses to record dataHITACHI LTD·Filed 1995·Granted Nov 26, 1996·2 cites·64 claims
- 3339US4847822AOptical information recording and reproducing apparatus with tracking control by samplingHITACHI LTD·Filed 1987·Granted Jul 11, 1989·4 cites·10 claims
- 3431US6069762AMagnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensorsHITACHI LTD·Filed 1999·Granted May 30, 2000·0 cites·10 claims
- 3531US6014275AMagnetic recording driveHITACHI LTD·Filed 1996·Granted Jan 11, 2000·0 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →