Inventor
MAEGAWA HIROSHI
JP24 patents
⚠️ This page may combine multiple inventors who share the name “MAEGAWA HIROSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
22 patentsUS6345018B1Feb 5, 2002
Demodulation circuit for demodulating wobbling signal
RICOH KK74 citations96
US5956313ASep 21, 1999
Phase-change optical disc recording method and apparatus, and information recording apparatus and recording pre-compensation method
RICOH KK50 citations96
US6160773ADec 12, 2000
Optical disk device
RICOH KK25 citations92
US5828634AOct 27, 1998
Optical disk tracking method and device for producing a tracking error signal and a track crossing signal
RICOH KK55 citations92
US5745463AApr 28, 1998
Phase-change optical disc recording method and apparatus, and information recording apparatus and recording pre-compensation method
RICOH KK31 citations92
US5648952AJul 15, 1997
Phase-change optical disc recording method and apparatus, and information recording apparatus and recording pre-compensation method
RICOH KK30 citations92
US5602823AFeb 11, 1997
Optical recording medium having pre-formatted patterns arrange by shifting phases
RICOH KK33 citations92
US5438601AAug 1, 1995
Reference clock frequency divider
RICOH KK25 citations92
US7715285B2May 11, 2010
Information recording medium having a plurality of recording layers
RICOH KK8 citations84
US6859425B2Feb 22, 2005
Wobble signal detection circuit and optical disk device
RICOH KK17 citations84
US6888783B2May 3, 2005
Wobble detection circuit corresponding to a plurality of media having different pre-formats and optical disk apparatus having reduced size
RICOH KK11 citations74
US6741540B2May 25, 2004
Optical pickup device, information reproduction/recording apparatus, and information processing apparatus
RICOH KK5 citations74
US7633846B2Dec 15, 2009
Multi-level information reproducing method, multi-level information recording medium, multi-level information waveform equalizing device, multi-level information reproducing apparatus, multi-level information recording apparatus, signal processing method, reproduced signal processing circuit and optical disk apparatus
RICOH KK2 citations63
US7474603B2Jan 6, 2009
Optical information recording method, apparatus, and medium, laser control circuit, wobble signal detection method, and servo signal detection method
RICOH KK2 citations63
US7426173B2Sep 16, 2008
Method and apparatus for definition of signal for record medium
RICOH KK6 citations63
USRE39513EMar 13, 2007
Demodulation circuit for demodulating wobbling signal
RICOH KK4 citations63
US7061845B2Jun 13, 2006
Write clock generating circuit and optical disk apparatus
RICOH KK5 citations63
US7046615B2May 16, 2006
Wobble detection circuit corresponding to a plurality of media having different pre-formats and optical disk apparatus having reduced size
RICOH KK2 citations63
US7729229B2Jun 1, 2010
Recording medium, wobble cycle detection method, wobble information detection method, wobble information detection circuit, and information recording/reproduction device
RICOH KK0 citations52
US7706242B2Apr 27, 2010
Optical disk, signal generation method, clock signal generation method, and optical disk device
RICOH KK0 citations52
US7260049B2Aug 21, 2007
Optical pickup device, information reproduction/recording apparatus, and information processing apparatus
RICOH KK0 citations52
US7016273B2Mar 21, 2006
Optical pickup device, information reproduction/recording apparatus, and information processing apparatus
RICOH KK0 citations52