Inventor · disambiguated record
Naoharu Yanagawa
Also filed as: YANAGAWA NAOHARU
69 granted patents·6 pending applications·849 citations·filing 1990–2012
99Inventor score
Files withPIONEER ELECTRONIC CORP36PIONEER CORP33YANAGAWA NAOHARU3PIONEER ELECTRIC CORP2IZAWA MASATAKA1
Top patents by PatentIndex Score
75 records- 0195US5764610AOptical disk type identification system using a frequency detectorPIONEER ELECTRONIC CORP·Filed 1997·Granted Jun 9, 1998·107 cites·12 claims
- 0289US7154831B2Device and method for controlling tilt servoPIONEER CORP·Filed 2005·Granted Dec 26, 2006·7 cites·5 claims
- 0388US6925039B2Device and method for controlling tilt servoPIONEER CORP·Filed 2001·Granted Aug 2, 2005·25 cites·11 claims
- 0488US6246660B1Device for controlling the power of a recording optical beam in an information storage apparatusPIONEER ELECTRONIC CORP·Filed 1999·Granted Jun 12, 2001·53 cites·15 claims
- 0587US6801488B2Pre-pit detecting apparatus for optical recording mediumPIONEER CORP·Filed 2002·Granted Oct 5, 2004·24 cites·11 claims
- 0685US6975574B2Device and method for controlling tilt servoPIONEER CORP·Filed 2001·Granted Dec 13, 2005·15 cites·21 claims
- 0783US5483512AOptical information recording/reproducing devicePIONEER ELECTRONIC CORP·Filed 1994·Granted Jan 9, 1996·31 cites·13 claims
- 0883US5381394AOptical pickup for an optical disc playerPIONEER ELECTRONIC CORP·Filed 1993·Granted Jan 10, 1995·33 cites·2 claims
- 0982US7436742B2Optical recording device and aberration correction methodPIONEER CORP·Filed 2004·Granted Oct 14, 2008·15 cites·13 claims
- 1082US6442115B1Information recording apparatusPIONEER CORP·Filed 1999·Granted Aug 27, 2002·38 cites·6 claims
- 1181US5287367AApparatus for controlling semiconductor laserPIONEER ELECTRONIC CORP·Filed 1992·Granted Feb 15, 1994·42 cites·11 claims
- 1279US6567354B2Optical pickup device minimizing an undesirable astigmatismPIONEER CORP·Filed 2002·Granted May 20, 2003·11 cites·17 claims
- 1378US5550799ADevice for and method of calibrating optimum recording power for recordable optical disc recording apparatusPIONEER ELECTRONIC CORP·Filed 1995·Granted Aug 27, 1996·31 cites·8 claims
- 1477US5673245ARotary optical system for guiding and converging divided light beams to a tape recording mediumPIONEER ELECTRONIC CORP·Filed 1995·Granted Sep 30, 1997·30 cites·9 claims
- 1576US5442609ATracking error signal correcting system which adjusts gain such that rending tracking error signals and recording trucking error signals and recording tracking error signals are equalPIONEER ELECTRONIC CORP·Filed 1993·Granted Aug 15, 1995·23 cites·3 claims
- 1675US6891784B2Apparatus and method for re-executing pre-pit detection if pre-pits are not detected after changing reference levelPIONEER CORP·Filed 2002·Granted May 10, 2005·12 cites·12 claims
- 1775US5363358AOptical disc apparatus with selection of three-beam and push-pull systemsPIONEER ELECTRONIC CORP·Filed 1993·Granted Nov 8, 1994·22 cites·2 claims
- 1873US7760606B2Recording apparatus and recording method, and computer programPIONEER CORP·Filed 2006·Granted Jul 20, 2010·2 cites·18 claims
- 1973US7746741B2Information recording device and method, and computer programPIONEER CORP·Filed 2005·Granted Jun 29, 2010·2 cites·12 claims
- 2073US7518964B2Information record apparatus and method, and computer program productPIONEER CORP·Filed 2005·Granted Apr 14, 2009·2 cites·16 claims
- 2172US7852726B2Recording apparatus and recording medium, and computer programPIONEER CORP·Filed 2006·Granted Dec 14, 2010·2 cites·19 claims
- 2269US6327237B2Optical pickup for recording or reproducing systemPIONEER ELECTRONIC CORP·Filed 2001·Granted Dec 4, 2001·6 cites·4 claims
- 2369US5136567APhoto-detecting devicePIONEER ELECTRONIC CORP·Filed 1991·Granted Aug 4, 1992·19 cites·6 claims
- 2468US5168486ARecording device for recording a blank disk from an optical diskPIONEER ELECTRONIC CORP·Filed 1990·Granted Dec 1, 1992·17 cites·3 claims
- 2566US6346695B2Optical pickup devicePIONEER ELECTRONIC CORP·Filed 1999·Granted Feb 12, 2002·19 cites·11 claims
- 2666US5748600ARotational optical head for optical recording mediumPIONEER ELECTRONIC CORP·Filed 1996·Granted May 5, 1998·20 cites·6 claims
- 2766US5610883AOptical pickup apparatus having means to eliminate crosstalk in a focus error signalPIONEER ELECTRONIC CORP·Filed 1995·Granted Mar 11, 1997·18 cites·4 claims
- 2865US6075759AOptical information recording and reproducing apparatusPIONEER ELECTRONIC CORP·Filed 1998·Granted Jun 13, 2000·19 cites·11 claims
- 2963US6160768AFloating optical pickup and information recording and reproducing apparatus including the samePIONEER ELECTRONIC CORP·Filed 1997·Granted Dec 12, 2000·16 cites·16 claims
- 3061US5132950AOptical head having a prism for splitting a beam of light into two polarized light beamsPIONEER ELECTRONIC CORP·Filed 1990·Granted Jul 21, 1992·14 cites·9 claims
- 3160US6088310APickup for an optical system including a blazed hologram for dividing a laserPIONEER ELECTRIC CORP·Filed 1997·Granted Jul 11, 2000·13 cites·3 claims
- 3259US5084850AApparatus for detecting focus error signalPIONEER ELECTRONIC CORP·Filed 1990·Granted Jan 28, 1992·16 cites·11 claims
- 3357US7099255B2Error counting apparatus for counting an error number of a pre-pit signal in an optical disc and method thereforPIONEER CORP·Filed 2002·Granted Aug 29, 2006·3 cites·15 claims
- 3457US6956802B2Aperture ratio measuring apparatus for optical recording medium with pre-pitsPIONEER CORP·Filed 2002·Granted Oct 18, 2005·3 cites·7 claims
- 3557US6928041B2Pre-pit detecting apparatus for optical recording mediumPIONEER CORP·Filed 2002·Granted Aug 9, 2005·3 cites·10 claims
- 3656US7042818B2Device and method for controlling tilt servoPIONEER CORP·Filed 2005·Granted May 9, 2006·0 cites·6 claims
- 3756US6363038B1Optical pickup device minimizing an undesirable astigmatismPIONEER CORP·Filed 1999·Granted Mar 26, 2002·10 cites·2 claims
- 3856US6266313B1Optical pickup for recording or reproducing systemPIONEER ELECTRONIC CORP·Filed 1997·Granted Jul 24, 2001·10 cites·4 claims
- 3954US8014256B2Optical pickup and information devicePIONEER CORP·Filed 2007·Granted Sep 6, 2011·0 cites·13 claims
- 4054US6731662B2Laser light intensity controllerPIONEER CORP·Filed 2001·Granted May 4, 2004·2 cites·30 claims
- 4154US5093816AOptical magnetic recording and reproducing systemPIONEER ELECTRIC CORP·Filed 1990·Granted Mar 3, 1992·9 cites·3 claims
- 4253US6954418B2Apparatus for adjusting signal levels derived from an optical disc to become equal to a reference level determined from at least one of the signal levels of the signals and for synthesizing the signalsPIONEER CORP·Filed 2002·Granted Oct 11, 2005·2 cites·25 claims
- 4353US6865143B2Optical device including a calibrating unit for calibrating a level adjusting unitPIONEER CORP·Filed 2002·Granted Mar 8, 2005·2 cites·2 claims
- 4453US6317400B1Optical pickup apparatusPIONEER ELECTRONIC CORP·Filed 1999·Granted Nov 13, 2001·10 cites·6 claims
- 4553US5982733AOptical headPIONEER ELECTRONIC CORP·Filed 1998·Granted Nov 9, 1999·10 cites·12 claims
- 4652US5894460AMagneto-optical card recording apparatus employing an initialization magnet and a recording magnetPIONEER ELECTRONIC CORP·Filed 1997·Granted Apr 13, 1999·10 cites·2 claims
- 4751US6577581B2Variable recording layer disk image pickup devicePIONEER CORP·Filed 2001·Granted Jun 10, 2003·1 cites·5 claims
- 4850US7961579B2Information reproduction apparatusPIONEER CORP·Filed 2006·Granted Jun 14, 2011·0 cites·3 claims
- 4950US7948844B2Information recording/reproducing device and the likePIONEER CORP·Filed 2006·Granted May 24, 2011·0 cites·10 claims
- 5050US6697398B2Laser light intensity controllerPIONEER CORP·Filed 2001·Granted Feb 24, 2004·1 cites·15 claims
Showing the top 50 of 75 patent records by PatentIndex Score.
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