Inventor · disambiguated record
Masahiro Ojima
Also filed as: OJIMA MASAHIRO
39 granted patents·1 pending application·1,058 citations·filing 1979–2004
98Inventor score
Top patents by PatentIndex Score
40 records- 0197US4908813AWavelength multiplexing optical recording apparatusHITACHI LTD·Filed 1987·Granted Mar 13, 1990·100 cites·9 claims
- 0297US4357616ARecording mediumHITACHI LTD·Filed 1980·Granted Nov 2, 1982·72 cites·13 claims
- 0396US4901325ASemiconductor laser deviceHITACHI LTD·Filed 1988·Granted Feb 13, 1990·81 cites·19 claims
- 0495US4894816AOptical information recording apparatusHITACHI LTD·Filed 1988·Granted Jan 16, 1990·68 cites·15 claims
- 0595US4410277AApparatus for detecting magneto-optical anisotropyHITACHI LTD·Filed 1979·Granted Oct 18, 1983·54 cites·1 claims
- 0693US4985881ARecord carrier for a magneto-optical disc memory having guide grooves of a plurality of tracks disposed with a predetermined relation to light spot diameterHITACHI LTD·Filed 1987·Granted Jan 15, 1991·46 cites·18 claims
- 0790US4984231AOptical information phase change recording medium having double protective layerHITACHI LTD·Filed 1988·Granted Jan 8, 1991·42 cites·20 claims
- 0890US4333173AOptical information processor with prismatic correction of laser beam shapeHITACHI LTD·Filed 1980·Granted Jun 1, 1982·61 cites·29 claims
- 0987US4712203AMethod and apparatus for thermo magnetic recording/erasing information with preselected magnetic field switchingHITACHI LTD·Filed 1985·Granted Dec 8, 1987·36 cites·8 claims
- 1086US4571650AMagneto-optic information storage system utilizing a self-coupled laserHITACHI LTD·Filed 1983·Granted Feb 18, 1986·28 cites·20 claims
- 1185US5245491AMagneto-optical head employing optical fiber connected stationary and movable portionsHITACHI CABLE·Filed 1990·Granted Sep 14, 1993·43 cites·17 claims
- 1285US5020041AMagneto-optical memory apparatus having a floating magnetic headHITACHI LTD·Filed 1988·Granted May 28, 1991·31 cites·23 claims
- 1384US5043960AOverwritable magneto-optic recording and reproducing apparatusHITACHI LTD·Filed 1988·Granted Aug 27, 1991·29 cites·19 claims
- 1482US4480325AOptical pickupHITACHI LTD·Filed 1983·Granted Oct 30, 1984·23 cites·21 claims
- 1581US6731846B2Dispersion compensator and optical transmission system using sameHITACHI LTD·Filed 2001·Granted May 4, 2004·27 cites·8 claims
- 1680US5737467AResin molded optical assemblyHITACHI LTD·Filed 1995·Granted Apr 7, 1998·60 cites·23 claims
- 1778US5235591AStack type optical disc apparatus, sealed and separate type optical head therefor and optical disc mediumHITACHI LTD·Filed 1991·Granted Aug 10, 1993·27 cites·34 claims
- 1875US5270987AMagneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium thereforHITACHI LTD·Filed 1990·Granted Dec 14, 1993·22 cites·53 claims
- 1975US4672594AMagneto-optical recording system utilizing a leakage magnetic field of focusing actuatorHITACHI LTD·Filed 1985·Granted Jun 9, 1987·20 cites·5 claims
- 2073US4712218AMethod of and apparatus for driving semiconductor laserHITACHI LTD·Filed 1984·Granted Dec 8, 1987·16 cites·15 claims
- 2172US4672593AOptical head with improved extinction ratio for magneto-optical memoryHITACHI LTD·Filed 1985·Granted Jun 9, 1987·18 cites·10 claims
- 2270US5408452AOptical information recording/reproducing system including novel tracking systemHITACHI MAXELL·Filed 1991·Granted Apr 18, 1995·20 cites·3 claims
- 2362US5253232AMagneto-optical recording apparatus having a magnetic slider with increased rail widthHITACHI LTD·Filed 1990·Granted Oct 12, 1993·13 cites·28 claims
- 2462US4982389AMagneto-optical recorder with compensation for variation in applied magnetic field intensity on a recording mediumHITACHI LTD·Filed 1988·Granted Jan 1, 1991·12 cites·10 claims
- 2562US4811348ASemiconductor laser array deviceHITACHI LTD·Filed 1988·Granted Mar 7, 1989·13 cites·8 claims
- 2660US5016234ATwo-laser collimated beam optical head with monitorHITACHI LTD·Filed 1988·Granted May 14, 1991·12 cites·13 claims
- 2759US6463191B1Optical switching device and optical switching methodHITACHI LTD·Filed 2000·Granted Oct 8, 2002·4 cites·17 claims
- 2858US5644554AMagnetic head load/unload device, method and a magneto-optical disk apparatus using the sameHITACHI LTD·Filed 1993·Granted Jul 1, 1997·11 cites·21 claims
- 2958US5293567AOptical recording methodHITACHI LTD·Filed 1992·Granted Mar 8, 1994·11 cites·10 claims
- 3054US5462811AMagneto-optical recording media and mangeto-optical device using the mediaHITACHI LTD·Filed 1992·Granted Oct 31, 1995·9 cites·14 claims
- 3152US4806952AInformation recording apparatus for recording/reproducing information by irradiating an information recording medium with an energy beamHITACHI LTD·Filed 1987·Granted Feb 21, 1989·8 cites·7 claims
- 3246US2005047372A1Seamless handover method for mobile IPv6 home agentFiled 2004·Application pending·0 cites
- 3345US4296419AMember for recording informationHITACHI LTD·Filed 1979·Granted Oct 20, 1981·7 cites·20 claims
- 3443US4982396AInformation recording medium and apparatus using reversible phase changeHITACHI LTD·Filed 1988·Granted Jan 1, 1991·5 cites·39 claims
- 3542US5208827ASemiconductor laser device having a transparent waveguide and a large second harmonic generation outputHITACHI LTD·Filed 1991·Granted May 4, 1993·8 cites·22 claims
- 3641US4855951AMethod for erasing recording in a PHB memoryHITACHI LTD·Filed 1987·Granted Aug 8, 1989·4 cites·17 claims
- 3741US4348461ARecording memberHITACHI LTD·Filed 1980·Granted Sep 7, 1982·7 cites·7 claims
- 3840US5263015AMagneto-optical recording media and overwrite recording method using the sameHITACHI LTD·Filed 1991·Granted Nov 16, 1993·4 cites·12 claims
- 3939US5161135AMagneto-optical disc memory apparatus including a header signal and magneto-optical signal level adjusting circuitHITACHI LTD·Filed 1990·Granted Nov 3, 1992·3 cites·11 claims
- 4038US5434844AMagneto-optical recording media and magneto-optical recording device using the sameHITACHI LTD·Filed 1993·Granted Jul 18, 1995·3 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →