Inventor
TSUCHINAGA HIROYUKI
JP30 patents
⚠️ This page may combine multiple inventors who share the name “TSUCHINAGA HIROYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
19 patentsUS5848045ADec 8, 1998
Method for recording and reading an optical disk
HITACHI LTD70 citations96
US5790482AAug 4, 1998
Optical disk apparatus for recording information using a light intensity modulation method with a partial response detector
HITACHI LTD62 citations96
US4970707ANov 13, 1990
Optical tape apparatus with a tracking control mechanism and/or a focusing control mechanism
HITACHI LTD64 citations96
US5703855ADec 30, 1997
Optical disk apparatus and recording and reading method for an optical disk using the same
HITACHI LTD61 citations95
US5513165AApr 30, 1996
Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing
HITACHI LTD90 citations95
US6654325B1Nov 25, 2003
Trial writing method and optical disk system using the same
HITACHI LTD46 citations93
US5828636AOct 27, 1998
Optical disk apparatus having optimized focus shift mechanism control
HITACHI LTD34 citations93
US5572503ANov 5, 1996
Correcting non-linear distortions of optical information with a non-linear equalizer
HITACHI LTD32 citations93
US5463600AOct 31, 1995
Magneto-optical recording system using recording waveform having a plurality of power levels providing high recording density
HITACHI LTD40 citations93
US5457666AOct 10, 1995
Light modulation method for forming a mark in magneto-optical recording system
HITACHI LTD53 citations93
US6215751B1Apr 10, 2001
Data demodulating method and optical disk device using the method
HITACHI LTD28 citations92
US5497361AMar 5, 1996
Information reproducing apparatus with a DC level correcting capability
HITACHI LTD32 citations92
US7227818B1Jun 5, 2007
Magneto-optical data recording/reproducing method
HITACHI LTD11 citations84
US7024617B2Apr 4, 2006
Data decoding method and circuit and information recording and reproducing apparatus using the same
HITACHI LTD10 citations74
US6785074B2Aug 31, 2004
Preamble pattern and magnetic recording system using the pattern
HITACHI LTD10 citations74
US6477131B1Nov 5, 2002
Head amplifier and an optical disk device using the same
HITACHI LTD10 citations74
US6320834B1Nov 20, 2001
Data demodulating method and optical disk device using the method
HITACHI LTD12 citations74
US5448544ASep 5, 1995
Data recording/playback apparatus and signal processing method
HITACHI LTD13 citations74
US5090005AFeb 18, 1992
Tape recorder with means for sampling and holding focusing and tracking error signals during discontinuity of tape on surface of rotating drum
HITACHI LTD18 citations74
HITACHI GLOBAL STORAGE TECH
9 patentsUS7502189B2Mar 10, 2009
Apparatus, signal-processing circuit and device for magnetic recording system
HITACHI GLOBAL STORAGE TECH156 citations99
US7486460B2Feb 3, 2009
Disk drive with enhanced storage capacity increase ratio
HITACHI GLOBAL STORAGE TECH66 citations98
US7440221B2Oct 21, 2008
Calibration of reader/writer offset in hard disk drive using shingled recording
HITACHI GLOBAL STORAGE TECH39 citations93
US7372656B2May 13, 2008
disk drive with side erase control
HITACHI GLOBAL STORAGE TECH17 citations84
US7142379B2Nov 28, 2006
Preamble pattern and magnetic recording system using the pattern
HITACHI GLOBAL STORAGE TECH6 citations74
US7817367B2Oct 19, 2010
Apparatus, signal-processing circuit and device for magnetic recording system
HITACHI GLOBAL STORAGE TECH4 citations63
US7612960B2Nov 3, 2009
Method for formatting data sectors on magnetic disk, and magnetic disk drive
HITACHI GLOBAL STORAGE TECH2 citations63
US7213195B2May 1, 2007
Data decoding method and circuit and information recording and reproducing apparatus using the same
HITACHI GLOBAL STORAGE TECH4 citations63
US7159166B2Jan 2, 2007
Error correction method, error correction circuit and information-recording/reproduction apparatus
HITACHI GLOBAL STORAGE TECH2 citations63