Inventor
OTSUKA YASUO
JP46 patents
⚠️ This page may combine multiple inventors who share the name “OTSUKA YASUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
38 patentsUS6231191B1May 15, 2001
Image display mechanism and image display device
HITACHI LTD85 citations99
US6299313B1Oct 9, 2001
Projection display apparatus and projection lens device for use therein
HITACHI LTD52 citations96
US6280038B1Aug 28, 2001
Optical equipment
HITACHI LTD66 citations96
US6290360B1Sep 18, 2001
Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same
HITACHI LTD59 citations95
US7021768B2Apr 4, 2006
Optical apparatus
HITACHI LTD11 citations93
US6431710B2Aug 13, 2002
Optical apparatus
HITACHI LTD23 citations93
US6783245B2Aug 31, 2004
Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same
HITACHI LTD17 citations92
US6411440B2Jun 25, 2002
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD19 citations92
US6256083B1Jul 3, 2001
Liquid crystal display apparatus and optical device for use therein
HITACHI LTD19 citations92
US6201645B1Mar 13, 2001
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD21 citations92
US5859829AJan 12, 1999
Disc apparatus for accepting a disc having at least one portion for preventing misinsertion
HITACHI LTD21 citations92
US5612940AMar 18, 1997
Disc cartridge for receiving a disk and mechanism for preventing an incorrect insertion of a cartridge
HITACHI LTD23 citations92
US5805312ASep 8, 1998
Thermographical image copier system with real time copying and variable read and record speeds
HITACHI LTD22 citations90
US6392809B2May 21, 2002
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD10 citations82
US5297133AMar 22, 1994
Optical disc cartridge and mechanism for preventing an incorrect insertion of a cartridge
HITACHI LTD17 citations81
US7175284B2Feb 13, 2007
Projection type display apparatus
HITACHI LTD6 citations74
US6908198B2Jun 21, 2005
Image display mechanism and image display device
HITACHI LTD7 citations74
US6857749B2Feb 22, 2005
Projection type display apparatus
HITACHI LTD7 citations74
US6829031B2Dec 7, 2004
Liquid crystal display apparatus and optical device for use therein
HITACHI LTD5 citations74
US6817720B2Nov 16, 2004
Image display mechanism and image display device
HITACHI LTD8 citations74
US6741396B2May 25, 2004
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD6 citations74
US6682197B2Jan 27, 2004
Image display mechanism and image display device
HITACHI LTD9 citations74
US6588910B2Jul 8, 2003
Image display mechanism and image display device
HITACHI LTD7 citations74
US6567218B2May 20, 2003
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD3 citations74
US6124979ASep 26, 2000
Projection display apparatus and projection lens device for use therein
HITACHI LTD10 citations74
US6824273B2Nov 30, 2004
Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same
HITACHI LTD9 citations73
US5831967ANov 3, 1998
Cartridge for preventing misinsertion
HITACHI LTD11 citations73
US5606547AFeb 25, 1997
Optical disc cartridge and mechanism for preventing an incorrect insertion of a cartridge
HITACHI LTD5 citations73
US4937801AJun 26, 1990
Magneto-optical recording and reproducing apparatus with magnetic field controller
HITACHI LTD13 citations73
US5548411AAug 20, 1996
Facsimile apparatus
HITACHI LTD11 citations71
US5452098ASep 19, 1995
Facsimile apparatus
HITACHI LTD11 citations71
US7832871B2Nov 16, 2010
Optical equipment with at least first and second ventilation paths
HITACHI LTD2 citations63
US7441904B2Oct 28, 2008
Projection type display apparatus with ventilation
HITACHI LTD2 citations63
US6535267B2Mar 18, 2003
Liquid crystal display apparatus having liquid crystal display element immersed in cooling medium
HITACHI LTD4 citations63
US7327520B2Feb 5, 2008
Optical unit and image display apparatus
HITACHI LTD0 citations52
US7106518B2Sep 12, 2006
Optical unit and image display apparatus
HITACHI LTD0 citations52
US6963453B2Nov 8, 2005
Optical unit and image display apparatus
HITACHI LTD0 citations52
US6545812B2Apr 8, 2003
Array lens, lighting optical system, optical unit and imaging apparatus
HITACHI LTD0 citations52