Inventor · disambiguated record
Ryuichi Katayama
Also filed as: KATAYAMA RYUICHI
48 granted patents·27 pending applications·568 citations·filing 1992–2014
98Inventor score
Top patents by PatentIndex Score
75 records- 0196US5696750AOptical head apparatus for different types of disksNEC CORP·Filed 1996·Granted Dec 9, 1997·133 cites·24 claims
- 0291US6201780B1Optical head with a phase plate for different types of disksNEC CORP·Filed 1998·Granted Mar 13, 2001·69 cites·38 claims
- 0388US5875167AOptical head deviceNEC CORP·Filed 1997·Granted Feb 23, 1999·55 cites·61 claims
- 0487US6707773B2Optical head and optical information recording and playback apparatusNEC CORP·Filed 2001·Granted Mar 16, 2004·24 cites·31 claims
- 0586US7414951B2Optical head device and optical recording and reproducing apparatusNEC CORP·Filed 2005·Granted Aug 19, 2008·5 cites·96 claims
- 0685US6804180B2Optical head assembly and optical information recording/reproducing deviceNEC CORP·Filed 2001·Granted Oct 12, 2004·20 cites·15 claims
- 0782US6282164B1Optical head having a phase-shifting diffraction gratingNEC CORP·Filed 1998·Granted Aug 28, 2001·37 cites·18 claims
- 0882US5353267AMagneto-optical light detector apparatusNEC CORP·Filed 1993·Granted Oct 4, 1994·32 cites·10 claims
- 0981US7599276B2Optical head device and optical information recording/reproduction apparatusNEC CORP·Filed 2005·Granted Oct 6, 2009·4 cites·14 claims
- 1079US6788628B2Optical head and optical data recording/reproducing apparatus using the sameNEC CORP·Filed 2001·Granted Sep 7, 2004·13 cites·92 claims
- 1179US6594206B2Optical head and optical information recording/reproducing deviceNEC CORP·Filed 2000·Granted Jul 15, 2003·13 cites·30 claims
- 1278US9028070B2Light emitting element having structural bodies arrayed at a first pitch along a first direction and arrayed at a second pitch different from said first pitch along a second direction and projection display device provided with sameTOMIYAMA MIZUHO·Filed 2010·Granted May 12, 2015·4 cites·9 claims
- 1377US6963522B2Optical head apparatus and optical information recording and reproducing apparatusNEC CORP·Filed 2002·Granted Nov 8, 2005·11 cites·103 claims
- 1475US7411882B2Optical head device and optical information recording/reproducing deviceNEC CORP·Filed 2006·Granted Aug 12, 2008·2 cites·15 claims
- 1571US7715296B2Optical head device and optical recording and reproducing apparatusNEC CORP·Filed 2008·Granted May 11, 2010·1 cites·6 claims
- 1670US5453963AMagneto-optical head system for detection of error and information signals by diffraction lightsNEC CORP·Filed 1995·Granted Sep 26, 1995·23 cites·6 claims
- 1768US7710849B2Optical head device and optical information recording or reproducing deviceNEC CORP·Filed 2005·Granted May 4, 2010·1 cites·6 claims
- 1867US7136344B2Optical head device and optical information recording/reproducing apparatusNEC CORP·Filed 2004·Granted Nov 14, 2006·6 cites·15 claims
- 1966US8643050B2Light emitting element and image display apparatus using the light emitting elementKATAYAMA RYUICHI·Filed 2010·Granted Feb 4, 2014·2 cites·10 claims
- 2065US6980505B2Optical head apparatus including two light sources and one photodetectorNEC CORP·Filed 2002·Granted Dec 27, 2005·7 cites·25 claims
- 2164US7200076B2Radial tilt detection optical head apparatus and optical information apparatusNEC CORP·Filed 2002·Granted Apr 3, 2007·5 cites·67 claims
- 2264US6046851APolarization beam splitter and method for making the sameNEC CORP·Filed 1997·Granted Apr 4, 2000·25 cites·4 claims
- 2363US6894958B2Optical system for detecting data signal and tracking error signalNEC CORP·Filed 1999·Granted May 17, 2005·12 cites·2 claims
- 2463US2009052301A1Optical system for detecting data signal and tracking error signal including polarizing optical elementNEC CORP·Filed 2008·Application pending·0 cites
- 2563US2009257339A1Optical head device and optical information recording or reproducing apparatusNEC CORP·Filed 2009·Application pending·0 cites
- 2662US5600614AOptical head system having super resolution elementNEC CORP·Filed 1995·Granted Feb 4, 1997·16 cites·20 claims
- 2762US5570333AHead device for magneto-optical diskNEC CORP·Filed 1994·Granted Oct 29, 1996·13 cites·7 claims
- 2862US2009190457A1Optical head device and optical information reproducing deviceNEC CORP·Filed 2009·Application pending·0 cites
- 2959US7327643B2Radial tilt compensating optical disk apparatus using tracking control loop gainNEC CORP·Filed 2003·Granted Feb 5, 2008·5 cites·17 claims
- 3059US7242647B2Optical head unit and optical information writing/reading deviceNEC CORP·Filed 2003·Granted Jul 10, 2007·3 cites·16 claims
- 3158US8045442B2Optical information recording/ reproducing device and optical information recording/ reproducing methodNEC CORP·Filed 2006·Granted Oct 25, 2011·0 cites·4 claims
- 3257US7542401B2Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatusNEC CORP·Filed 2007·Granted Jun 2, 2009·0 cites·2 claims
- 3356US7085218B2Optical head device and optical information recording or reproducing deviceNEC CORP·Filed 2002·Granted Aug 1, 2006·2 cites·5 claims
- 3454US8238219B2Optical information recording/reproducing device, optical unit, and optical information recording methodTOMINAGA SHIN·Filed 2009·Granted Aug 7, 2012·0 cites·10 claims
- 3554US2005135207A1Optical system for detecting data signal and tracking error signalNEC CORP·Filed 2005·Application pending·0 cites
- 3653US7948854B2Optical head apparatus and optical information recording/reproducing apparatusNEC CORP·Filed 2006·Granted May 24, 2011·0 cites·15 claims
- 3753US5426626APhotodetecting system for a magneto-optical disk head systemNEC CORP·Filed 1992·Granted Jun 20, 1995·15 cites·8 claims
- 3853US2011110207A1Optical unit, control method, and optical information recording/reproducing deviceKATAYAMA RYUICHI·Filed 2009·Application pending·0 cites
- 3952US7272091B2Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatusNEC CORP·Filed 2003·Granted Sep 18, 2007·1 cites·17 claims
- 4052US2010061217A1Optical head unit and optical information recording/reproducing apparatusNEC CORP·Filed 2007·Application pending·0 cites
- 4152US2010046353A1Optical recording medium, optical head device and optical information recording/reproducing deviceNEC CORP·Filed 2008·Application pending·0 cites
- 4251US7622696B2Optical head device, optical information recording/reproducing apparatus and operation method of optical information recording/reproducing apparatusNEC CORP·Filed 2006·Granted Nov 24, 2009·0 cites·22 claims
- 4351US2009274020A1Optical head unit and optical information recording/reproducing apparatusNEC CORP·Filed 2007·Application pending·0 cites
- 4451US2010309770A1Optical head device and optical information recording/reproducing deviceNEC CORP·Filed 2007·Application pending·0 cites
- 4551US2010019126A1Optical head device, optical information recording/reproducing device, and optical information recording/reproducing method thereofKATAYAMA RYUICHI·Filed 2008·Application pending·0 cites
- 4651US2010220577A1Optical head device, optical information recording/reproducing device, and optical information recording/reproducing methodKATAYAMA RYUICHI·Filed 2008·Application pending·0 cites
- 4751US2010085860A1Optical head device, and optical information recording/reproducing device and optical information recording/reproducing method using the sameKATAYAMA RYUICHI·Filed 2008·Application pending·0 cites
- 4851US2010085495A1Optical head device and optical information recording/reproducing deviceKATAYAMA RYUICHI·Filed 2008·Application pending·0 cites
- 4951US2010061216A1Optical head unit and optcal information recording/reproducing apparatusKATAYAMA RYUICHI·Filed 2008·Application pending·0 cites
- 5050US8254238B2Optical information recording/ reproducing apparatus and optical information recording and reproducing methodKATAYAMA RYUICHI·Filed 2011·Granted Aug 28, 2012·0 cites·20 claims
Showing the top 50 of 75 patent records by PatentIndex Score.
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