Inventor
OKUMURA TOSHIYUKI
JP43 patents
⚠️ This page may combine multiple inventors who share the name “OKUMURA TOSHIYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SHARP KK
30 patentsUS6456640B1Sep 24, 2002
Gallium nitride type semiconductor laser device
SHARP KK54 citations96
US6377597B1Apr 23, 2002
Gallium nitride semiconductor light emitting element with active layer having multiplex quantum well structure and semiconductor laser light source device
SHARP KK38 citations96
US5049970ASep 17, 1991
High resistive element
SHARP KK66 citations96
US6614824B2Sep 2, 2003
Nitride semiconductor laser device and optical device using the same
SHARP KK52 citations92
US6549552B1Apr 15, 2003
Nitride-type compound semiconductor laser device and laser apparatus incorporating the same
SHARP KK24 citations92
US6370176B1Apr 9, 2002
Gallium nitride group semiconductor laser device and optical pickup apparatus
SHARP KK46 citations92
US5841584ANov 24, 1998
Dielectric multilayered reflector
SHARP KK30 citations92
US5070510ADec 3, 1991
Semiconductor laser device
SHARP KK50 citations91
US7356218B2Apr 8, 2008
Variable demultiplexer
SHARP KK35 citations87
US6556603B1Apr 29, 2003
Nitride-contained semiconductor laser element and optical information reproducing device
SHARP KK16 citations84
US7274010B2Sep 25, 2007
Semiconductor optical amplifier device amplifying an externally applied light signal, semiconductor optical amplification driving device and semiconductor light receiving apparatus
SHARP KK17 citations82
US7199398B2Apr 3, 2007
Nitride semiconductor light emitting device having electrode electrically separated into at least two regions
SHARP KK14 citations82
US5031991AJul 16, 1991
Optical coupling circuit element
SHARP KK19 citations82
US7183569B2Feb 27, 2007
Gallium nitride semiconductor light emitting device having multi-quantum-well structure active layer, and semiconductor laser light source device
SHARP KK7 citations74
US6956882B2Oct 18, 2005
Gallium nitride semiconductor light emitting device having multi-quantum-well structure active layer, and semiconductor laser light source device
SHARP KK8 citations74
US6764870B2Jul 20, 2004
Method for manufacturing a gallium nitride type semiconductor laser device
SHARP KK12 citations74
US6842470B2Jan 11, 2005
Nitride-type compound semiconductor laser device and laser apparatus incorporating the same
SHARP KK10 citations73
US5375135ADec 20, 1994
Semiconductor laser device
SHARP KK9 citations73
US5345460ASep 6, 1994
Semiconductor laser device with window regions
SHARP KK13 citations73
US5335241AAug 2, 1994
Buried stripe type semiconductor laser device
SHARP KK13 citations73
US7251390B2Jul 31, 2007
Planar waveguide device
SHARP KK8 citations71
US5658824AAug 19, 1997
Method of fabricating a semiconductor laser device
SHARP KK10 citations70
US7088902B2Aug 8, 2006
Photonic crystal and producing method thereof
SHARP KK9 citations66
US7015565B2Mar 21, 2006
Gallium nitride type semiconductor laser device
SHARP KK1 citations63
US5182758AJan 26, 1993
Periodic gain-type semiconductor laser device
SHARP KK6 citations63
US5506856AApr 9, 1996
Semiconductor laser device having a resonator of particular length for reduced threshold current density
SHARP KK4 citations62
US5351258ASep 27, 1994
Semiconductor laser device
SHARP KK6 citations62
US7864412B2Jan 4, 2011
Semiconductor optical amplifier device amplifying external light signal and driving apparatus therefor
SHARP KK4 citations60
US5657337AAug 12, 1997
Semiconductor laser device having a resonator of a particular length for reducing threshold current density
SHARP KK1 citations51
US7515624B2Apr 7, 2009
Semiconductor laser, semiconductor laser driver and method of driving semiconductor laser reducing feedback-induced noise by modulated optical output
SHARP KK1 citations50
NEC CORP
8 patentsUS6787384B2Sep 7, 2004
Functional device, method of manufacturing therefor and driver circuit
NEC CORP51 citations96
US6781208B2Aug 24, 2004
Functional device, method of manufacturing therefor and driver circuit
NEC CORP13 citations92
US6160688ADec 12, 2000
Magneto-resistive composite head and a magnetic disk device, having grounded magnetic shielding layers
NEC CORP47 citations92
US6714719B1Mar 30, 2004
Video recording system using magnetic disk drive
NEC CORP9 citations74
US5926019AJul 20, 1999
System for evaluating the play back of magnetoresistive heads
NEC CORP14 citations74
US6157507ADec 5, 2000
Performance evaluation method of an MR head and a magnetic disk device wherein the method is applied
NEC CORP11 citations73
US5404259AApr 4, 1995
Magnetic head having high wear resistance and non-magnetic substrate used in the magnetic head
NEC CORP1 citations48
US5448425ASep 5, 1995
Method for erasing information recorded on magnetic tape with reduced residual magnetization
NEC CORP0 citations42