Inventor
TSURUKAWA IKUYA
JP18 patents
Patents
18 patentsUS6628893B2Sep 30, 2003
DC motor rotation control apparatus
RICOH KK36 citations92
US6617816B2Sep 9, 2003
DC motor rotation detecting apparatus and DC motor rotation control apparatus
RICOH KK34 citations92
US5293034AMar 8, 1994
Focus state detection device
RICOH KK28 citations92
US5267085ANov 30, 1993
Zoom lens apparatus of two-lens group structure
RICOH KK21 citations92
US7259923B2Aug 21, 2007
Lens barrel
RICOH KK25 citations91
US4985719AJan 15, 1991
Apparatus for preventing static electricity of plastic lens
RICOH KK23 citations90
US4847648AJul 11, 1989
Varifocal camera
RICOH KK25 citations90
US5392159AFeb 21, 1995
Zoom lens device of two-lens group structure and driving device of varifocal lens of two-lens group structure
RICOH KK35 citations89
US7744294B2Jun 29, 2010
Lens barrel, camera, portable information terminal device, and image input device
RICOH KK13 citations84
US6570350B2May 27, 2003
DC motor rotation detecting apparatus and DC motor rotation control apparatus
RICOH KK15 citations84
US5146254ASep 8, 1992
Apparatus for driving varifocal lens
RICOH KK12 citations73
US4561747ADec 31, 1985
Auto-focusing method
RICOH KK14 citations73
US4950061AAug 21, 1990
Drive device for a varifocal lens system
RICOH KK19 citations72
US4831399AMay 16, 1989
Finder switching apparatus for camera
RICOH KK14 citations72
US4498754AFeb 12, 1985
Single lens reflex camera
RICOH KK9 citations72
US7048574B2May 23, 2006
Resilient contact structure with bypass wire and camera having such contact
RICOH KK7 citations69
US7307368B2Dec 11, 2007
DC motor
RICOH KK6 citations63
US4605295AAug 12, 1986
Single lens reflex camera
RICOH KK5 citations61