Inventor
OHUCHIDA SHIGERU
JP23 patents
Patents
23 patentsUS5107359AApr 21, 1992
Optical wavelength-divison multi/demultiplexer
RICOH KK127 citations98
US5231620AJul 27, 1993
Magneto-optical recording/reproducing apparatus with light beam splitting means
RICOH KK75 citations96
US5015835AMay 14, 1991
Optical information reading and writing device with diffraction means
RICOH KK56 citations96
US5956302ASep 21, 1999
Optical pick-up device and method using a high-density double diffraction grating
RICOH KK36 citations92
US5684779ANov 4, 1997
Optical head with forward and reflected light beams propagating through a dual diffraction grating device along a common path
RICOH KK42 citations92
US5428588AJun 27, 1995
Optical head
RICOH KK33 citations92
US5278817AJan 11, 1994
Optical pick-up for use with an opto-magnetic signal
RICOH KK25 citations92
US5115423AMay 19, 1992
Optomagnetic recording/reproducing apparatus
RICOH KK39 citations92
US5107477AApr 21, 1992
Integrated optical pick-up device
RICOH KK29 citations92
US5101389AMar 31, 1992
Optical information recording/reproducing apparatus
RICOH KK52 citations92
US5060212AOct 22, 1991
Integrated optical pick-up device
RICOH KK36 citations92
US4935911AJun 19, 1990
Optical head device for recording and reproducing information
RICOH KK30 citations92
US5243583ASep 7, 1993
Optical pickup device with dual grating element
RICOH KK34 citations90
US7197003B2Mar 27, 2007
Optical element, optical pickup unit, and optical disk drive unit
RICOH KK13 citations84
US6876621B2Apr 5, 2005
Optical apparatus for recording/reproducing and reading/reproducing data on an optical recording medium, and method for using same
RICOH KK16 citations84
US5097462AMar 17, 1992
Integrated optical pick-up device
RICOH KK17 citations82
US6937554B2Aug 30, 2005
Optical pickup apparatus having an improved holographic unit, and optical disk drive including the same
RICOH KK11 citations74
US5325348AJun 28, 1994
Wavelength converting element and system for recording and reproducing optical information
RICOH KK19 citations74
US7457222B2Nov 25, 2008
Optical element, optical pickup unit, and optical disk drive unit
RICOH KK2 citations63
US6810001B2Oct 26, 2004
Optical pickup apparatus and optical pickup method adapted for selectively using laser light of different wavelengths
RICOH KK4 citations63
US7426169B2Sep 16, 2008
Optical pickup apparatus and optical pickup method
RICOH KK0 citations52
US7307938B2Dec 11, 2007
Optical pickup apparatus having an improved holographic unit, and optical disk drive including the same
RICOH KK1 citations52
US7177258B2Feb 13, 2007
Optical pickup apparatus, optical data recording/reproducing apparatus, and optical data recording/reproducing method
RICOH KK1 citations52