Inventor · disambiguated record
Tetsu Watanabe
Also filed as: WATANABE TETSU
60 granted patents·4 pending applications·866 citations·filing 1980–2021
99Inventor score
Top patents by PatentIndex Score
64 records- 0195US4559568AApparatus for re-recording a digital signal on a record medium and for reproducing the same therefromSONY CORP·Filed 1983·Granted Dec 17, 1985·51 cites·12 claims
- 0294US5533001AMagneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lensSONY CORP·Filed 1995·Granted Jul 2, 1996·57 cites·3 claims
- 0393US5610880AOptical disc system and optical disk thereforSONY CORP·Filed 1996·Granted Mar 11, 1997·69 cites·2 claims
- 0491US5392263AMagneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lensSONY CORP·Filed 1994·Granted Feb 21, 1995·31 cites·9 claims
- 0591US4348699AApparatus for recording and/or reproducing digital signalSONY CORP·Filed 1980·Granted Sep 7, 1982·39 cites·11 claims
- 0689US6717738B2Optical element, metal mold for producing optical element and production method for optical elementSONY CORP·Filed 2001·Granted Apr 6, 2004·18 cites·46 claims
- 0788US6747943B2Optical recording medium and disc cartridgeSONY CORP·Filed 2001·Granted Jun 8, 2004·17 cites·2 claims
- 0886US5838646AOptical disk having a protective layer of specified thickness relative to the numerical aperture of the objective lensSONY CORP·Filed 1997·Granted Nov 17, 1998·38 cites·6 claims
- 0984US7547868B2Optical near-field generating apparatus and method and information recording and reproducing apparatusSONY CORP·Filed 2008·Granted Jun 16, 2009·10 cites·21 claims
- 1083US5170385ARecording medium with unembossed area indicating sector divisionsSONY CORP·Filed 1990·Granted Dec 8, 1992·34 cites·4 claims
- 1182US5515346AMagneto-optical disk system with specified thickness for protective layer relative to the numerical apperture of the objective lensSONY CORP·Filed 1995·Granted May 7, 1996·22 cites·4 claims
- 1282US5414687ADisc recording/reproducing apparatusSONY CORP·Filed 1993·Granted May 9, 1995·29 cites·1 claims
- 1381US5287334AMagneto-optical pickup apparatus and magneto-optical recording/reproducing apparatusSONY CORP·Filed 1991·Granted Feb 15, 1994·32 cites·14 claims
- 1481US5200935ARecording apparatus using magneto-optical effect including control means for inhibiting energizing of the light beam generating means in responsive to coded dataSONY CORP·Filed 1990·Granted Apr 6, 1993·30 cites·7 claims
- 1579US6992842B2Optical device, optical system, method of production of same, and mold for production of sameSONY CORP·Filed 2005·Granted Jan 31, 2006·6 cites·6 claims
- 1679US5757733AOptical disc system having an objective lens with a numerical aperture related to the thickness of the protective layerSONY CORP·Filed 1996·Granted May 26, 1998·18 cites·12 claims
- 1778US8023365B2Optical near-field generating device, optical near-field generating method and information recording and reproducing apparatusSONY CORP·Filed 2007·Granted Sep 20, 2011·3 cites·21 claims
- 1877US5488590AMagneto-optical overwrite recording and reproducing systemSONY CORP·Filed 1994·Granted Jan 30, 1996·25 cites·12 claims
- 1976US6898027B2Optical element and manufacturing method for sameSONY CORP·Filed 2002·Granted May 24, 2005·9 cites·6 claims
- 2076US6704275B2Optical recording medium and disc cartridge having 2 GB capacitySONY CORP·Filed 2001·Granted Mar 9, 2004·7 cites·4 claims
- 2175US7064906B2Optical pickup device with shielding to limit incident or emitted lightSONY CORP·Filed 2005·Granted Jun 20, 2006·2 cites·4 claims
- 2274US8203913B2Recording/reproduction apparatus and recording/reproduction systemHONGO KAZUHIRO·Filed 2009·Granted Jun 19, 2012·2 cites·12 claims
- 2374US6785222B2Read-only optical recording medium and disc cartridgeSONY CORP·Filed 2001·Granted Aug 31, 2004·7 cites·3 claims
- 2473US4998231AMagneto-optical disk recording apparatusSONY CORP·Filed 1989·Granted Mar 5, 1991·17 cites·8 claims
- 2571US6496450B2Optical recording/reproducing apparatus, optical rotating recording medium, and method of designing optical recording/reproducing apparatusSONY CORP·Filed 2000·Granted Dec 17, 2002·8 cites·20 claims
- 2671USRE37428EMagneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lensSONY CORP·Filed 1995·Granted Oct 30, 2001·13 cites·9 claims
- 2771US5495455AMagneto-optical disk recording and reading apparatus and method wherein the recording head is controlled in the radial direction of the disk to a desired positionSONY CORP·Filed 1993·Granted Feb 27, 1996·20 cites·2 claims
- 2869US6966707B2Optical pickupSONY CORP·Filed 2005·Granted Nov 22, 2005·4 cites·1 claims
- 2969US5428583AMagneto-optical disc recording/reproducing apparatusSONY CORP·Filed 1992·Granted Jun 27, 1995·19 cites·7 claims
- 3069US5189650AMagneto-optical signal reproducing apparatus in which reproduced magneto-optical signal level is compared with reference signal level varied in accordance with in-phase signalSONY CORP·Filed 1990·Granted Feb 23, 1993·18 cites·7 claims
- 3168US7305689B2Optical recording medium and disc cartridgeSONY CORP·Filed 2004·Granted Dec 4, 2007·4 cites·2 claims
- 3268US6825995B2Optical device, optical system, method of production of same, and mold for production of sameSONY CORP·Filed 2001·Granted Nov 30, 2004·7 cites·9 claims
- 3366US6985310B2Optical device, optical system, method of production of same, and mold for production of sameSONY CORP·Filed 2004·Granted Jan 10, 2006·6 cites·13 claims
- 3465US5329503AMagneto-optical disc recording/reproducing apparatusSONY CORP·Filed 1992·Granted Jul 12, 1994·25 cites·10 claims
- 3564US6262948B1Optical disk having a protective layer specified thickness relative to the NA of an objective lens and the wavelength of light sourceSONY CORP·Filed 1998·Granted Jul 17, 2001·14 cites·18 claims
- 3664US6169714B1Apparatus and method for recording/reproducing magneto-optical informationHITACHI LTD·Filed 1998·Granted Jan 2, 2001·17 cites·12 claims
- 3763US7454771B2Optical recording medium and disc cartridgeSONY CORP·Filed 2007·Granted Nov 18, 2008·0 cites·2 claims
- 3862US5182734AMagneto-optical recording apparatus with pulse driven light beam and variable delay of magnetic field reversals based on recording medium characteristicsSONY CORP·Filed 1989·Granted Jan 26, 1993·12 cites·9 claims
- 3961US6972912B2Optical device, optical system, method of production of same, and mold for production of sameSONY CORP·Filed 2004·Granted Dec 6, 2005·4 cites·12 claims
- 4059US5559774AOptical disc reproducing apparatus which employs a binary detector for the outer tracks and a ternary detector for the inner tracksSONY CORP·Filed 1991·Granted Sep 24, 1996·12 cites·8 claims
- 4158US5914915AMagneto-optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layerSONY CORP·Filed 1996·Granted Jun 22, 1999·13 cites·3 claims
- 4258US5781518ADisc recording method wherein a segment is recorded with reference data to control the phase of a data clockSONY CORP·Filed 1997·Granted Jul 14, 1998·13 cites·2 claims
- 4357US11222182B2Server device, servicing method, and programRAKUTEN GROUP INC·Filed 2018·Granted Jan 11, 2022·0 cites·8 claims
- 4457US5910932AOptical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical diskSONY CORP·Filed 1997·Granted Jun 8, 1999·12 cites·23 claims
- 4556US5587990AOptical disc system and optical disc thereforSONY CORP·Filed 1995·Granted Dec 24, 1996·10 cites·4 claims
- 4653US5838656AOptical disk system having an objective lens with a numerical aperture related to the thickness of the protective layerSONY CORP·Filed 1997·Granted Nov 17, 1998·5 cites·9 claims
- 4752US5508981AMagneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lensSONY CORP·Filed 1995·Granted Apr 16, 1996·5 cites·2 claims
- 4851US6896419B2Optical pickupSONY CORP·Filed 2003·Granted May 24, 2005·2 cites·3 claims
- 4950US7420892B2Optical head device, and optical recording/reproducing deviceSONY CORP·Filed 2003·Granted Sep 2, 2008·1 cites·22 claims
- 5049US6075762ADisc drive apparatusSONY CORP·Filed 1998·Granted Jun 13, 2000·8 cites·7 claims
Showing the top 50 of 64 patent records by PatentIndex Score.
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