Inventor
IZUMI HARUHIKO
JP34 patents
⚠️ This page may combine multiple inventors who share the name “IZUMI HARUHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
32 patentsUS5347505ASep 13, 1994
Optical medium recording method and apparatus employing pulse width delay and/or advancement
FUJITSU LTD62 citations96
US5812501ASep 22, 1998
Optical recording medium having a non-volatile identification code and method for encoding data using same
FUJITSU LTD43 citations95
US5661703AAug 26, 1997
Optical recording medium having a non-volatile identification code and method for encoding data using same
FUJITSU LTD95 citations95
US5986987ANov 16, 1999
PRML readout system for optical disk
FUJITSU LTD36 citations93
US5680380AOct 21, 1997
Data readout system for optical disk having maximum likelihood data detecting circuit
FUJITSU LTD36 citations93
US5675565AOct 7, 1997
Data reproduction method and apparatus
FUJITSU LTD26 citations93
US6320832B1Nov 20, 2001
Laser power control in information recording device
FUJITSU LTD22 citations92
US5740154AApr 14, 1998
Magnetooptical record medium having adjacent header signals
FUJITSU LTD18 citations92
US5691072ANov 25, 1997
Magneto-optical recording medium and method of reproducing information recorded on such medium
FUJITSU LTD36 citations92
US5610895AMar 11, 1997
Optical head having light blocking means positioned in front of a detector for super-resolution detection
FUJITSU LTD27 citations92
US5390156AFeb 14, 1995
Magneto-optic overwrite disk recording system for erasing and overwriting in a single pass
FUJITSU LTD21 citations92
US5235590AAug 10, 1993
Read out apparatus for reading out information from magneto-optic disk
FUJITSU LTD38 citations92
US6507543B2Jan 14, 2003
Optical disk apparatus and galvano-mirror used for the same
FUJITSU LTD13 citations84
US5854775ADec 29, 1998
Magneto-optic disk recording system having improved duty ratio controller
FUJITSU LTD20 citations84
US6072754AJun 6, 2000
Magneto-optical medium and reproducing device for the same
FUJITSU LTD9 citations74
US6026064AFeb 15, 2000
Head driving apparatus and optical disk apparatus
FUJITSU LTD14 citations74
US5850377ADec 15, 1998
Data readout system for optical disk having maximum likehood data detecting circuit
FUJITSU LTD6 citations74
US5745464AApr 28, 1998
Edge position data reproduction apparatus
FUJITSU LTD16 citations74
US5598392AJan 28, 1997
Data reproduction system synchronized by recording data
FUJITSU LTD13 citations74
US5428594AJun 27, 1995
Magneto-optic recording method and apparatus utilizing a two-state modulated light beam
FUJITSU LTD9 citations74
US6341102B1Jan 22, 2002
Data writing/reading apparatus
FUJITSU LTD11 citations73
US6103407AAug 15, 2000
Magneto-optical recording medium and method of using same
FUJITSU LTD8 citations73
US6030716AFeb 29, 2000
Magneto-optical recording medium and method of reproducing information recorded on such medium
FUJITSU LTD7 citations73
US7430086B2Sep 30, 2008
Discrete track recording method, storage apparatus and method of producing storage apparatus
FUJITSU LTD5 citations63
US6741528B1May 25, 2004
Magneto-optical head device
FUJITSU LTD4 citations63
US5981016ANov 9, 1999
Magneto-optical medium and reproducing device for the same
FUJITSU LTD2 citations63
US5859813AJan 12, 1999
Magneto-optical recording method and apparatus to be used in the method
FUJITSU LTD2 citations63
US5359586AOct 25, 1994
Read out apparatus for reading out information from magneto-optic disk
FUJITSU LTD6 citations63
US5876858AMar 2, 1999
Magneto-optical recording medium with magnetic film having large magnetic anisotropy
FUJITSU LTD2 citations62
US5871855AFeb 16, 1999
Magneto-optical recording medium and method of using same
FUJITSU LTD4 citations62
US5663936ASep 2, 1997
Magneto-optic recording medium suited for mark edge recording system and having magnetic layer made of composition modulated material
FUJITSU LTD2 citations62
US6272079B1Aug 7, 2001
Optical head unit for optical disk apparatus having both focus control and track control function
FUJITSU LTD6 citations61