Inventor
SUKEDA HIROFUMI
JP89 patents
⚠️ This page may combine multiple inventors who share the name “SUKEDA HIROFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
49 patentsUS6649894B2Nov 18, 2003
Optical near field generator
HITACHI LTD117 citations98
US6256277B1Jul 3, 2001
Information recording apparatus having controlled recording energy generation circuit
HITACHI LTD84 citations98
US6160784ADec 12, 2000
Recording a mark with the rising and falling edges varied based on previously recorded control data
HITACHI LTD89 citations98
US5867455AFeb 2, 1999
Optical method and device for irradiating domains at predetermined positions
HITACHI LTD117 citations98
US6392985B2May 21, 2002
Optical reproduction apparatus for reproducing information from optical recording medium having wobbled address pits
HITACHI LTD44 citations97
US6370106B2Apr 9, 2002
Optical reproduction apparatus
HITACHI LTD43 citations97
US5898663AApr 27, 1999
Optical recording medium with address information prepit for the same track at opposite boundaries of the same track
HITACHI LTD61 citations97
US6925040B1Aug 2, 2005
Information recording method, information recording medium and information recording apparatus
HITACHI LTD33 citations96
US6104685AAug 15, 2000
Information recording apparatus
HITACHI LTD48 citations96
US5982738ANov 9, 1999
Optical recording medium having at least wobbled synchronous information shared between tracks
HITACHI LTD17 citations96
US5959943ASep 28, 1999
Information recording medium with clock information therein
HITACHI LTD69 citations96
US5790482AAug 4, 1998
Optical disk apparatus for recording information using a light intensity modulation method with a partial response detector
HITACHI LTD62 citations96
US4894816AJan 16, 1990
Optical information recording apparatus
HITACHI LTD68 citations96
US7283439B2Oct 16, 2007
Optical disk apparatus using mechanism for controlling spherical aberration
HITACHI LTD25 citations93
US7260033B2Aug 21, 2007
Optical reproducing apparatus
HITACHI LTD20 citations93
US7215609B2May 8, 2007
Optical reproducing apparatus
HITACHI LTD22 citations93
US7012875B2Mar 14, 2006
Optical disk apparatus using focal shift signals to control spherical aberration
HITACHI LTD27 citations93
US6683823B2Jan 27, 2004
Method for reproducing information on a recording medium
HITACHI LTD22 citations93
US5572503ANov 5, 1996
Correcting non-linear distortions of optical information with a non-linear equalizer
HITACHI LTD32 citations93
US5315573AMay 24, 1994
Non-linear optical saturable absorber layer in an optical disk to discriminate wavelength above or below a threshold level of intensity
HITACHI LTD26 citations93
US5313448AMay 17, 1994
Laser device driven by a periodic waveform optimized for reducing laser noise
HITACHI LTD31 citations93
US5270987ADec 14, 1993
Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor
HITACHI LTD22 citations93
US7133230B2Nov 7, 2006
Recording head and information recording apparatus
HITACHI LTD40 citations92
US7079457B2Jul 18, 2006
Method of reproducing information with equalization coefficient for the reproduced information
HITACHI LTD24 citations92
US6728197B2Apr 27, 2004
Optical disk having a plurality of information recording units
HITACHI LTD20 citations92
US6529466B2Mar 4, 2003
Information recording apparatus
HITACHI LTD17 citations92
US6480447B1Nov 12, 2002
Method of reproducing information using a selected equalization coefficient for each signal
HITACHI LTD17 citations92
US6188658B1Feb 13, 2001
Information recording apparatus
HITACHI LTD15 citations92
US6064644AMay 16, 2000
Optical recording medium having particular arrangement of prepits and manufacturing method thereof
HITACHI LTD13 citations86
US6603730B2Aug 5, 2003
Optical reproducing method
HITACHI LTD12 citations82
US6580685B2Jun 17, 2003
Optical recording medium with aligned prepit portion
HITACHI LTD4 citations82
US6552994B2Apr 22, 2003
Optical reproduction apparatus
HITACHI LTD6 citations82
US6549510B2Apr 15, 2003
Optical recording medium having grooves and lands
HITACHI LTD4 citations82
US6542456B2Apr 1, 2003
Optical reproducing method
HITACHI LTD6 citations82
US6532207B2Mar 11, 2003
Optical reproducing method
HITACHI LTD4 citations82
US6529470B2Mar 4, 2003
Optical recording medium with aligned prepit portion
HITACHI LTD6 citations82
US6483800B2Nov 19, 2002
Optical reproduction apparatus for reproducing information from an optical recording medium having wobbled pits
HITACHI LTD6 citations82
US6430146B1Aug 6, 2002
Optical reproducing method
HITACHI LTD5 citations82
US6262968B1Jul 17, 2001
Optical information processing apparatus
HITACHI LTD8 citations82
US5170383ADec 8, 1992
Magneto-optical data recording system
HITACHI LTD13 citations82
US7349317B2Mar 25, 2008
Information recording method, information recording medium and information recording apparatus
HITACHI LTD3 citations74
US7099263B2Aug 29, 2006
Optical reproducing method for optical medium with aligned prepit portion
HITACHI LTD1 citations74
US6944105B2Sep 13, 2005
Method of reproducing information with equalization for the reproduced information to reduce inter-symbol interference
HITACHI LTD7 citations74
US6845081B2Jan 18, 2005
Optical reproducing method for optical medium with aligned prepit portion
HITACHI LTD3 citations74
US6545973B2Apr 8, 2003
Optical reproduction apparatus
HITACHI LTD2 citations74
US6538980B2Mar 25, 2003
Optical disc
HITACHI LTD2 citations74
US6538981B2Mar 25, 2003
Optical reproduction apparatus
HITACHI LTD4 citations74
US6125084ASep 26, 2000
Optical disk device using a recording medium structurally arranged to generate a recording clock
HITACHI LTD10 citations74
US5886958AMar 23, 1999
Information recording apparatus and method for modulated magneto-optical recording medium
HITACHI LTD3 citations74
HITACHI MAXELL
1 patentShowing the top 50 of 89 patents by PatentIndex Score.