Inventor · disambiguated record
Kohji Sakai
Also filed as: SAKAI KOHJI
83 granted patents·3 pending applications·1,983 citations·filing 1997–2021
99Inventor score
Top patents by PatentIndex Score
86 records- 0198US7068407B2Optical element, optical scanner and image forming apparatusRICOH KK·Filed 2005·Granted Jun 27, 2006·49 cites·18 claims
- 0298US6509995B1Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatusRICOH KK·Filed 2000·Granted Jan 21, 2003·142 cites·6 claims
- 0397US7417777B2Optical scanning device and image forming apparatusRICOH KK·Filed 2007·Granted Aug 26, 2008·42 cites·11 claims
- 0497US6448998B1Scanning and imaging lens, optical scanning device and image forming apparatusRICOH KK·Filed 2000·Granted Sep 10, 2002·122 cites·31 claims
- 0597US6388792B1Optical scanning device and image forming apparatusRICOH KK·Filed 2000·Granted May 14, 2002·117 cites·42 claims
- 0696US7253937B2Multi-beam optical scanning device and image forming apparatusRICOH KK·Filed 2006·Granted Aug 7, 2007·59 cites·18 claims
- 0796US6771407B2Optical scanner and image formation apparatusRICOH KK·Filed 2002·Granted Aug 3, 2004·82 cites·5 claims
- 0895US7616364B2Scanning optical system, optical scanner, and image forming apparatus having a biconvex lens having a change of curvature of the toric surface in the cross section in the sub-scanning direction along the main scanning direction is asymmetric with an optical axis of the lensRICOH KK·Filed 2006·Granted Nov 10, 2009·19 cites·12 claims
- 0995US7006120B2Multi-beam optical scanning apparatus and image forming apparatusRICOH KK·Filed 2003·Granted Feb 28, 2006·65 cites·33 claims
- 1095US6596985B2Multi-beam scanning device, multi-beam scanning method, light source device, and image forming apparatusRIOCH COMPANY LTD·Filed 2001·Granted Jul 22, 2003·101 cites·22 claims
- 1194US5999345AMulti-beam light source unitRICOH KK·Filed 1998·Granted Dec 7, 1999·131 cites·40 claims
- 1293US7443558B2Optical scanning device and image forming apparatusRICOH KK·Filed 2007·Granted Oct 28, 2008·29 cites·10 claims
- 1392US11740453B2Apparatus configured to fly light-absorbing material, apparatus configured to model three-dimensional modeled object, and method of flying light-absorbing materialSUHARA HIROYUKI·Filed 2020·Granted Aug 29, 2023·3 cites·16 claims
- 1492USRE45918EOptical scanning apparatus, optical writing apparatus, and image forming apparatusRICOH CO LTD·Filed 2012·Granted Mar 8, 2016·13 cites·18 claims
- 1592US7672032B2Optical scanner and image forming apparatus using optical scannerRICOH KK·Filed 2007·Granted Mar 2, 2010·27 cites·18 claims
- 1692US7362486B2Optical scanning device with at least one resin lens for controlling a beam waist position shiftRICOH KK·Filed 2005·Granted Apr 22, 2008·28 cites·16 claims
- 1792US6999208B2Optical scanner, optical scanning method, scanning image forming optical system, optical scanning lens and image forming apparatusRICOH KK·Filed 2001·Granted Feb 14, 2006·52 cites·120 claims
- 1892US6781729B2Optical scanning system with unvarying image surface under environmental temperature changeRICOH KK·Filed 2002·Granted Aug 24, 2004·58 cites·42 claims
- 1991US8922863B2Optical scanning device and image forming apparatusTOKITA TOSHIAKI·Filed 2012·Granted Dec 30, 2014·8 cites·10 claims
- 2091US7663657B2Optical scanning device and image forming apparatusRICOH KK·Filed 2007·Granted Feb 16, 2010·26 cites·6 claims
- 2191US6606179B2Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatusRICOH KK·Filed 2002·Granted Aug 12, 2003·39 cites·10 claims
- 2290US7038822B2Optical element, optical scanner and image forming apparatusRICOH KK·Filed 2003·Granted May 2, 2006·37 cites·22 claims
- 2388US7215354B1Scanning optical system, optical scanning device and image forming apparatusRICOH KK·Filed 2000·Granted May 8, 2007·37 cites·21 claims
- 2488US6801351B2Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatusRICOH KK·Filed 2002·Granted Oct 5, 2004·28 cites·3 claims
- 2588US6256133B1Optical scanning apparatusRICOH KK·Filed 1999·Granted Jul 3, 2001·85 cites·23 claims
- 2687US8009342B2Optical scanning device, image forming apparatus, and controlling methodRICOH CO LTD·Filed 2010·Granted Aug 30, 2011·4 cites·5 claims
- 2787US7688491B2Diffractive-optical element, scanning optical system, optical scanner, and image forming apparatusRICOH KK·Filed 2007·Granted Mar 30, 2010·17 cites·17 claims
- 2887US7411712B2Optical scanner and image formation apparatusRICOH KK·Filed 2004·Granted Aug 12, 2008·35 cites·24 claims
- 2986US9981604B2Object detector and sensing apparatusSAKAI KOHJI·Filed 2015·Granted May 29, 2018·6 cites·14 claims
- 3086US6937371B2Optical scanner and image formation apparatusRICOH KK·Filed 2004·Granted Aug 30, 2005·27 cites·20 claims
- 3186US6347004B1Optical scanning apparatus and scanning image forming lensRICOH KK·Filed 1999·Granted Feb 12, 2002·75 cites·19 claims
- 3284US7876486B2Optical scanning apparatus, optical writing apparatus, and image forming apparatusRICOH CO LTD·Filed 2007·Granted Jan 25, 2011·11 cites·16 claims
- 3384US6856438B2Optical scanning lens and apparatus capable of effectively generating accurately-pitched light spots, and image forming apparatus using the sameRICOH KK·Filed 2003·Granted Feb 15, 2005·28 cites·12 claims
- 3483US6800845B2Multi-beam scanning device, multi-beam scanning method, light source device, and image forming apparatusRICOH KK·Filed 2003·Granted Oct 5, 2004·22 cites·20 claims
- 3583US6288819B1Scanning image forming lens and optical scanning apparatusRICOH KK·Filed 2000·Granted Sep 11, 2001·30 cites·22 claims
- 3683US6166842AScanning image forming lens and optical scanning apparatusRICOH KK·Filed 1999·Granted Dec 26, 2000·44 cites·35 claims
- 3782US9557563B2Optical scanning device, method of adjusting optical scanning device, and image forming apparatusSUZUKI MITSUO·Filed 2015·Granted Jan 31, 2017·2 cites·7 claims
- 3882US9448436B2Planar light source device and liquid crystal display device equipped with sameSHARP KK·Filed 2012·Granted Sep 20, 2016·3 cites·20 claims
- 3982US6229638B1Optical scanning apparatus capable of reducing variations in shading and improving light usageRICOH KK·Filed 1999·Granted May 8, 2001·54 cites·10 claims
- 4080US10203431B2Microlens array, image display apparatus, object apparatus, and moldSAKAI KOHJI·Filed 2017·Granted Feb 12, 2019·2 cites·7 claims
- 4180US9568605B2Object detector and sensorAKATSU KAZUHIRO·Filed 2014·Granted Feb 14, 2017·5 cites·19 claims
- 4280US9235154B2Image forming method of exposing the surface of an image carrier with light and image forming apparatusSUHARA HIROYUKI·Filed 2014·Granted Jan 12, 2016·2 cites·9 claims
- 4380US8077369B2Optical scanning device, optical writing device, and image forming apparatusSAKAI KOHJI·Filed 2011·Granted Dec 13, 2011·4 cites·9 claims
- 4480US7034973B2Scanning optical system, optical scanning device, and image forming apparatusRICOH KK·Filed 2003·Granted Apr 25, 2006·21 cites·62 claims
- 4578US8441513B2Light source device and image forming apparatusSAKAI KOHJI·Filed 2010·Granted May 14, 2013·4 cites·11 claims
- 4677US6348988B2Scanning image forming lens and optical scanning apparatusRICOH KK·Filed 2001·Granted Feb 19, 2002·25 cites·12 claims
- 4776US10371817B2Object detecting apparatusRICOH CO LTD·Filed 2018·Granted Aug 6, 2019·2 cites·17 claims
- 4876US9435938B2Edge-lit surface light source deviceSHARP KK·Filed 2013·Granted Sep 6, 2016·3 cites·8 claims
- 4975US6366384B1Multi-beam scanning method, apparatus and multi-beam light source device achieving improved scanning line pitch using large light emitting points intervalRICOH KK·Filed 1999·Granted Apr 2, 2002·41 cites·3 claims
- 5074US6348989B2Scanning image forming lens and optical scanning apparatusRICOH KK·Filed 2001·Granted Feb 19, 2002·22 cites·10 claims
Showing the top 50 of 86 patent records by PatentIndex Score.
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