Inventor · disambiguated record
Yutaka Yamanaka
Also filed as: YAMANAKA YUTAKA
50 granted patents·24 pending applications·870 citations·filing 1985–2021
98Inventor score
Top patents by PatentIndex Score
74 records- 0199US5181161ASignal reproducing apparatus for optical recording and reproducing equipment with compensation of crosstalk from nearby tracks and method for the sameNEC CORP·Filed 1990·Granted Jan 19, 1993·230 cites·8 claims
- 0297US4945529AOptical head comprising a diffraction grating for directing two or more diffracted beams to optical detectorsNEC CORP·Filed 1986·Granted Jul 31, 1990·91 cites·25 claims
- 0391US6424436B1Holographic elementNEC CORP·Filed 2000·Granted Jul 23, 2002·48 cites·23 claims
- 0491US5121378AOptical head apparatus for focussing a minute light beam spot on a recording mediumNEC CORP·Filed 1989·Granted Jun 9, 1992·43 cites·8 claims
- 0591US4817074AMethod and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording systemNEC CORP·Filed 1986·Granted Mar 28, 1989·45 cites·7 claims
- 0689US6771584B2Optical disk, aberration correction method and optical disk apparatusNEC CORP·Filed 2001·Granted Aug 3, 2004·26 cites·18 claims
- 0787US5255278ASemiconductor laser with vertical resonatorNEC CORP·Filed 1992·Granted Oct 19, 1993·54 cites·8 claims
- 0884US7474599B2Optical disc medium, and apparatus and method for recording data on the sameNEC CORP·Filed 2004·Granted Jan 6, 2009·17 cites·12 claims
- 0983US4647495AElectromagnetic reflection bodyBRIDGESTONE CORP·Filed 1985·Granted Mar 3, 1987·43 cites·12 claims
- 1082US5892749AOptical head device for reading two optical disksNEC CORP·Filed 1997·Granted Apr 6, 1999·38 cites·7 claims
- 1180US6791927B2Optical head having optimum tilt anglesNEC CORP·Filed 2002·Granted Sep 14, 2004·14 cites·20 claims
- 1278US5982732AOptical head having multiple light sources having different wavelengthsNEC CORP·Filed 1997·Granted Nov 9, 1999·30 cites·30 claims
- 1377US7471617B2Optical disc medium having extended record control data areas, optical disc apparatus using the same, and data recording method on the sameNEC CORP·Filed 2005·Granted Dec 30, 2008·3 cites·1 claims
- 1476US6993753B2Compiler for parallel computerFUJITSU LTD·Filed 2001·Granted Jan 31, 2006·22 cites·18 claims
- 1576US4894815AOptical head for reading information from a magnetooptic recording mediumNEC CORP·Filed 1988·Granted Jan 16, 1990·20 cites·4 claims
- 1673US7643394B2Optical disk, optical disk recording method, and optical disk recording apparatusTOSHIBA KK·Filed 2005·Granted Jan 5, 2010·2 cites·8 claims
- 1770US5453963AMagneto-optical head system for detection of error and information signals by diffraction lightsNEC CORP·Filed 1995·Granted Sep 26, 1995·23 cites·6 claims
- 1868US5365540AVertical-to-surface optical semiconductor device and apparatus for coupling optical signalsNEC CORP·Filed 1993·Granted Nov 15, 1994·23 cites·5 claims
- 1966US7355957B2Optical disc medium having a system information recording area of low recording densityNEC CORP·Filed 2004·Granted Apr 8, 2008·6 cites·3 claims
- 2066US7196984B2Optical disk medium and optical disk recording and reproducing apparatusNEC CORP·Filed 2004·Granted Mar 27, 2007·6 cites·8 claims
- 2166US5835283ACondenser lens for optical disksNEC CORP·Filed 1997·Granted Nov 10, 1998·18 cites·2 claims
- 2259US7817528B2Optical disk medium and optical disk apparatusNEC CORP·Filed 2007·Granted Oct 19, 2010·0 cites·6 claims
- 2359US7391708B2Optical disc and method for reproducing the sameNEC CORP·Filed 2003·Granted Jun 24, 2008·3 cites·13 claims
- 2459US7327643B2Radial tilt compensating optical disk apparatus using tracking control loop gainNEC CORP·Filed 2003·Granted Feb 5, 2008·5 cites·17 claims
- 2557US6266302B1Optical disk apparatusNEC CORP·Filed 1999·Granted Jul 24, 2001·12 cites·7 claims
- 2656US8391113B2Optical disc for tuple-speed recording and optical disc device for tuple-speed recordingNAKATANI MORIO·Filed 2009·Granted Mar 5, 2013·0 cites·5 claims
- 2756US7355942B2Optical disk and optical disk drive for suppressing a digital sum value and low-frequency componentsTEAC CORP·Filed 2004·Granted Apr 8, 2008·2 cites·6 claims
- 2855US7551533B2Optical disk, optical disk drive and method of playing back an optical diskTOSHIBA KK·Filed 2006·Granted Jun 23, 2009·0 cites·11 claims
- 2955US6912186B2Data recording/reproducing method for optical disk and apparatus for the sameNEC CORP·Filed 2002·Granted Jun 28, 2005·2 cites·12 claims
- 3054US5923635AOptical information recording or playbacking system, optical head apparatus used in the system and method for recording or playbacking optical informationNEC CORP·Filed 1997·Granted Jul 13, 1999·11 cites·18 claims
- 3153US7791987B2Recording type optical disc medium and optical disc device for the sameNEC CORP·Filed 2005·Granted Sep 7, 2010·0 cites·7 claims
- 3251US7471602B2Recording/reproducing method and recording/reproducing apparatus and optical diskTOSHIBA KK·Filed 2005·Granted Dec 30, 2008·0 cites·2 claims
- 3350US11063509B2Step-up switching power supply circuitDENSO CORP·Filed 2020·Granted Jul 13, 2021·0 cites·6 claims
- 3450US8331208B2Information readout device and information readout methodYAMANAKA YUTAKA·Filed 2008·Granted Dec 11, 2012·0 cites·10 claims
- 3550US7835256B2Two-layer optical disk and recording/reproducing optical disk apparatus of the two-layer optical diskNEC CORP·Filed 2006·Granted Nov 16, 2010·0 cites·3 claims
- 3650US7336576B2Optical disk medium and optical disk recording/reproducing apparatus utilizing tilt detection areas having special marksTOSHIBA KK·Filed 2004·Granted Feb 26, 2008·1 cites·10 claims
- 3750US6205108B1Optical head for reproducing or recording a compact or similar diskNEC CORP·Filed 1997·Granted Mar 20, 2001·7 cites·6 claims
- 3850US2007280081A1Recording control method of rewritable type optical disc and drive unit for recording and reproducing the sameNEC CORP·Filed 2007·Application pending·0 cites
- 3950US2008031116A1Information management method for information recording medium, recording method, and information recording/reproducing apparatus therebyNEC CORP·Filed 2007·Application pending·0 cites
- 4050US2007230300A1Recording method on rewritable optical disc and optical disc driving apparatusNEC CORP·Filed 2007·Application pending·0 cites
- 4149US2007165492A1Recording type optical disc apparatus and optical disc mediumNEC CORP·Filed 2006·Application pending·0 cites
- 4248US7492697B2Optical disc recording method and apparatusSANYO ELECTRIC CO·Filed 2005·Granted Feb 17, 2009·0 cites·14 claims
- 4348US2006271942A1Optical disc medium and optical disc deviceNEC CORP·Filed 2006·Application pending·0 cites
- 4448US2006292492A1Optical information recording medium and optical information reproducing apparatusNEC CORP·Filed 2006·Application pending·0 cites
- 4547US6414804B1Converging optical system for laser beam sourceNEC CORP·Filed 2000·Granted Jul 2, 2002·1 cites·10 claims
- 4647US2010322049A1Optical disc drive deviceYAMANAKA YUTAKA·Filed 2009·Application pending·0 cites
- 4746US7492696B2Optical disk medium and optical disk apparatusNEC CORP·Filed 2004·Granted Feb 17, 2009·0 cites·8 claims
- 4846US2006039268A1Method for manufacturing optical disk media of high-to-low and low-to-high reflectance typesNEC CORP·Filed 2005·Application pending·0 cites
- 4946US2023091376A1Deterioration prediction system, deterioration prediction method, and recordingmedium for storing programNEC CORP·Filed 2021·Application pending·0 cites
- 5045US2005243698A1Optical disc medium and optical disc apparatusNEC CORP·Filed 2005·Application pending·0 cites
Showing the top 50 of 74 patent records by PatentIndex Score.
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