Inventor
SAKAI KOHJI
JP83 patents
⚠️ This page may combine multiple inventors who share the name “SAKAI KOHJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
39 patentsUS6509995B1Jan 21, 2003
Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatus
RICOH KK142 citations99
US7253937B2Aug 7, 2007
Multi-beam optical scanning device and image forming apparatus
RICOH KK59 citations98
US7006120B2Feb 28, 2006
Multi-beam optical scanning apparatus and image forming apparatus
RICOH KK65 citations98
US6771407B2Aug 3, 2004
Optical scanner and image formation apparatus
RICOH KK82 citations98
US6448998B1Sep 10, 2002
Scanning and imaging lens, optical scanning device and image forming apparatus
RICOH KK122 citations98
US6388792B1May 14, 2002
Optical scanning device and image forming apparatus
RICOH KK117 citations98
US6256133B1Jul 3, 2001
Optical scanning apparatus
RICOH KK85 citations98
US5999345ADec 7, 1999
Multi-beam light source unit
RICOH KK131 citations98
US7068407B2Jun 27, 2006
Optical element, optical scanner and image forming apparatus
RICOH KK49 citations96
US6781729B2Aug 24, 2004
Optical scanning system with unvarying image surface under environmental temperature change
RICOH KK58 citations96
US6606179B2Aug 12, 2003
Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatus
RICOH KK39 citations96
US6347004B1Feb 12, 2002
Optical scanning apparatus and scanning image forming lens
RICOH KK75 citations96
US6229638B1May 8, 2001
Optical scanning apparatus capable of reducing variations in shading and improving light usage
RICOH KK54 citations96
US6166842ADec 26, 2000
Scanning image forming lens and optical scanning apparatus
RICOH KK44 citations96
US7672032B2Mar 2, 2010
Optical scanner and image forming apparatus using optical scanner
RICOH KK27 citations93
US7443558B2Oct 28, 2008
Optical scanning device and image forming apparatus
RICOH KK29 citations93
US7417777B2Aug 26, 2008
Optical scanning device and image forming apparatus
RICOH KK42 citations93
US7362486B2Apr 22, 2008
Optical scanning device with at least one resin lens for controlling a beam waist position shift
RICOH KK28 citations93
US7215354B1May 8, 2007
Scanning optical system, optical scanning device and image forming apparatus
RICOH KK37 citations93
US7038822B2May 2, 2006
Optical element, optical scanner and image forming apparatus
RICOH KK37 citations93
US7034973B2Apr 25, 2006
Scanning optical system, optical scanning device, and image forming apparatus
RICOH KK21 citations93
US6999208B2Feb 14, 2006
Optical scanner, optical scanning method, scanning image forming optical system, optical scanning lens and image forming apparatus
RICOH KK52 citations93
US6937371B2Aug 30, 2005
Optical scanner and image formation apparatus
RICOH KK27 citations93
US6856438B2Feb 15, 2005
Optical scanning lens and apparatus capable of effectively generating accurately-pitched light spots, and image forming apparatus using the same
RICOH KK28 citations93
US6800845B2Oct 5, 2004
Multi-beam scanning device, multi-beam scanning method, light source device, and image forming apparatus
RICOH KK22 citations93
US6801351B2Oct 5, 2004
Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatus
RICOH KK28 citations93
US6366384B1Apr 2, 2002
Multi-beam scanning method, apparatus and multi-beam light source device achieving improved scanning line pitch using large light emitting points interval
RICOH KK41 citations93
US6348988B2Feb 19, 2002
Scanning image forming lens and optical scanning apparatus
RICOH KK25 citations93
US6348989B2Feb 19, 2002
Scanning image forming lens and optical scanning apparatus
RICOH KK22 citations93
US5831758ANov 3, 1998
Multi-beam optical scanner
RICOH KK27 citations93
US7663657B2Feb 16, 2010
Optical scanning device and image forming apparatus
RICOH KK26 citations92
US7411712B2Aug 12, 2008
Optical scanner and image formation apparatus
RICOH KK35 citations92
US6704129B2Mar 9, 2004
Optical scanning apparatus capable of reducing variations in shading and improving light usage
RICOH KK14 citations88
US6288819B1Sep 11, 2001
Scanning image forming lens and optical scanning apparatus
RICOH KK30 citations87
US7616364B2Nov 10, 2009
Scanning 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 lens
RICOH KK19 citations84
US7688491B2Mar 30, 2010
Diffractive-optical element, scanning optical system, optical scanner, and image forming apparatus
RICOH KK17 citations83
US7330296B2Feb 12, 2008
Synchronous detector, optical scanner, and image forming apparatus
RICOH KK7 citations74
US6903855B2Jun 7, 2005
Multi-beam scanning method, apparatus and multi-beam light source device achieving improved scanning line pitch using large light emitting points interval
RICOH KK9 citations74
USRE38195EJul 22, 2003
Multi-beam optical scanner
RICOH KK12 citations74
RICOH CO LTD
3 patentsUSRE45918EMar 8, 2016
Optical scanning apparatus, optical writing apparatus, and image forming apparatus
RICOH CO LTD13 citations84
US7876486B2Jan 25, 2011
Optical scanning apparatus, optical writing apparatus, and image forming apparatus
RICOH CO LTD11 citations84
US10371817B2Aug 6, 2019
Object detecting apparatus
RICOH CO LTD2 citations73
SHARP KK
2 patentsRIOCH COMPANY LTD
1 patentAKATSU KAZUHIRO
1 patentTOKITA TOSHIAKI
1 patentSAKAI KOHJI
1 patentSUHARA HIROYUKI
1 patentSUZUKI MITSUO
1 patentShowing the top 50 of 83 patents by PatentIndex Score.