Inventor
SAKUMA NOBUO
JP45 patents
⚠️ This page may combine multiple inventors who share the name “SAKUMA NOBUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
38 patentsUS7048388B2May 23, 2006
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH KK140 citations99
US5606181AFeb 25, 1997
Edge emitting type light emitting diode array heads
RICOH KK204 citations98
US7637621B2Dec 29, 2009
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH KK26 citations96
US7631975B2Dec 15, 2009
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH KK25 citations96
US7441908B2Oct 28, 2008
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH KK35 citations96
US6292305B1Sep 18, 2001
Virtual screen display device
RICOH KK77 citations96
US5408095AApr 18, 1995
Optical scanner having an image forming mirror and means for reducing scanning line pitch irregularities
RICOH KK59 citations96
US5233454AAug 3, 1993
Image forming reflecting mirror for constant speed optical scan and optical scanner
RICOH KK58 citations96
US5005928AApr 9, 1991
Optical scanning system
RICOH KK68 citations96
US7637618B2Dec 29, 2009
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH KK17 citations93
US6545803B1Apr 8, 2003
Virtual screen display device
RICOH KK28 citations93
US5970034AOct 19, 1999
Multiple-beam optical recording apparatus
RICOH KK21 citations93
US4955682ASep 11, 1990
Scanning optical system
RICOH KK27 citations93
US4934772AJun 19, 1990
Light beam scanning lens and light beam scanning device
RICOH KK37 citations93
US4932734AJun 12, 1990
Optical scanning system using a laser diode array
RICOH KK32 citations93
US4756585AJul 12, 1988
Optical beam scanning system
RICOH KK31 citations93
US4695132ASep 22, 1987
Fθ single lens
RICOH KK27 citations93
US4571035AFeb 18, 1986
Two-element fθ lens group capable of correcting leaning of deflecting plane
RICOH KK28 citations93
US3982116ASep 21, 1976
Slit illumination system for copying machine
RICOH KK35 citations93
US5426298AJun 20, 1995
Optical scanner
RICOH KK50 citations92
US5128795AJul 7, 1992
Scanning lens and scanning apparatus using scanning lens
RICOH KK39 citations92
US4953171AAug 28, 1990
Semiconductor laser source unit
RICOH KK39 citations92
US4943128AJul 24, 1990
Light scanning device
RICOH KK24 citations92
US4712884ADec 15, 1987
Lens system for deflected light beam
RICOH KK34 citations87
US5170278ADec 8, 1992
Return optical deflecting element, optical deflecting element and optical scanner
RICOH KK28 citations86
US7705868B2Apr 27, 2010
Light emitting array with improved characteristics, optical writing unit, and image forming apparatus
RICOH KK11 citations84
US4770517ASep 13, 1988
Two-lens fθ lens
RICOH KK23 citations82
US5852499ADec 22, 1998
Method and device for determining fiber orientation of paper, and apparatus for removing image forming substance from paper
RICOH KK11 citations74
US5729349AMar 17, 1998
Method and device for determining fiber orientation of paper, and apparatus for removing image forming substance from paper
RICOH KK9 citations74
US5373390ADec 13, 1994
Optical scanning system
RICOH KK10 citations74
US5233455AAug 3, 1993
Scanning optical system
RICOH KK15 citations74
US5155616AOct 13, 1992
Scanning optical system
RICOH KK19 citations74
US4758059AJul 19, 1988
Post-objective type optical deflector
RICOH KK15 citations74
US4707085ANov 17, 1987
Fθ lens for use in light beam scanner
RICOH KK17 citations74
US4154500AMay 15, 1979
Exposure optical system for electrostatic copying machine or the like
RICOH KK17 citations73
US5157534AOct 20, 1992
Optical scanner
RICOH KK11 citations72
US5666220ASep 9, 1997
Optical scanner and polygon mirror
RICOH KK5 citations63
US4436407AMar 13, 1984
Electrophotographic reproduction of a three-dimensional object
RICOH KK6 citations63
RICOH CO LTD
4 patentsUSRE45258ENov 25, 2014
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH CO LTD14 citations93
US7938545B2May 10, 2011
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH CO LTD14 citations93
US7922341B2Apr 12, 2011
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH CO LTD13 citations93
USRE48309ENov 17, 2020
Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
RICOH CO LTD1 citations73