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Shigeru Ohuchida
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical element, optical pickup unit, and optical disk drive unit
Patent number
7,457,222
Issue date
Nov 25, 2008
Ricoh Company, Ltd.
Hideaki Hirai
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup apparatus and optical pickup method
Patent number
7,426,169
Issue date
Sep 16, 2008
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup apparatus having an improved holographic unit, and o...
Patent number
7,307,938
Issue date
Dec 11, 2007
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical element, optical pickup unit, and optical disk drive unit
Patent number
7,197,003
Issue date
Mar 27, 2007
Ricoh Company, Ltd.
Hideaki Hirai
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup apparatus, optical data recording/reproducing appara...
Patent number
7,177,258
Issue date
Feb 13, 2007
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup apparatus having an improved holographic unit, and o...
Patent number
6,937,554
Issue date
Aug 30, 2005
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical apparatus for recording/reproducing and reading/reproducing...
Patent number
6,876,621
Issue date
Apr 5, 2005
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup apparatus and optical pickup method adapted for sele...
Patent number
6,810,001
Issue date
Oct 26, 2004
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pick-up device and method using a high-density double diffr...
Patent number
5,956,302
Issue date
Sep 21, 1999
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical head with forward and reflected light beams propagating thr...
Patent number
5,684,779
Issue date
Nov 4, 1997
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical head
Patent number
5,428,588
Issue date
Jun 27, 1995
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Wavelength converting element and system for recording and reproduc...
Patent number
5,325,348
Issue date
Jun 28, 1994
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pick-up for use with an opto-magnetic signal
Patent number
5,278,817
Issue date
Jan 11, 1994
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical pickup device with dual grating element
Patent number
5,243,583
Issue date
Sep 7, 1993
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Magneto-optical recording/reproducing apparatus with light beam spl...
Patent number
5,231,620
Issue date
Jul 27, 1993
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optomagnetic recording/reproducing apparatus
Patent number
5,115,423
Issue date
May 19, 1992
Ricoh Company, Ltd.
Hideo Maeda
G11 - INFORMATION STORAGE
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,107,477
Issue date
Apr 21, 1992
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical wavelength-divison multi/demultiplexer
Patent number
5,107,359
Issue date
Apr 21, 1992
Ricoh Company, Ltd.
Shigeru Ohuchida
G02 - OPTICS
Information
Patent Grant
Optical information recording/reproducing apparatus
Patent number
5,101,389
Issue date
Mar 31, 1992
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,097,462
Issue date
Mar 17, 1992
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Integrated optical pick-up device
Patent number
5,060,212
Issue date
Oct 22, 1991
Ricoh Company, Ltd.
Kazuhiro Fujita
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical information reading and writing device with diffraction means
Patent number
5,015,835
Issue date
May 14, 1991
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Grant
Optical head device for recording and reproducing information
Patent number
4,935,911
Issue date
Jun 19, 1990
Ricoh Company, Ltd.
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Patents Applications
last 30 patents
Information
Patent Application
Optical element, optical pickup unit, and optical disk drive unit
Publication number
20070147218
Publication date
Jun 28, 2007
Hideaki Hirai
G11 - INFORMATION STORAGE
Information
Patent Application
Optical element, optical pickup unit, and optical disk drive unit
Publication number
20060158977
Publication date
Jul 20, 2006
Hideaki Hirai
G11 - INFORMATION STORAGE
Information
Patent Application
Optical pickup apparatus having an improved holographic unit, and o...
Publication number
20050088948
Publication date
Apr 28, 2005
Ricoh Corporation
Shigeru Ohuchida
G02 - OPTICS
Information
Patent Application
Optical pickup apparatus, optical data recording/reproducing appara...
Publication number
20050058051
Publication date
Mar 17, 2005
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Application
Optical pickup apparatus and optical pickup method
Publication number
20050036431
Publication date
Feb 17, 2005
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Application
Optical element, optical pickup unit, and optical disk drive unit
Publication number
20020093902
Publication date
Jul 18, 2002
Hideaki Hirai
G11 - INFORMATION STORAGE
Information
Patent Application
Optical pickup apparatus having an improved holographic unit, and o...
Publication number
20020018432
Publication date
Feb 14, 2002
Shigeru Ohuchida
G02 - OPTICS
Information
Patent Application
Optical pickup apparatus and optical pickup method
Publication number
20020018433
Publication date
Feb 14, 2002
Shigeru Ohuchida
G11 - INFORMATION STORAGE
Information
Patent Application
Optical pickup apparatus, optical data recording/reproducing appara...
Publication number
20010026523
Publication date
Oct 4, 2001
Shigeru Ohuchida
G11 - INFORMATION STORAGE