Inventor
SEO KATSUHIRO
JP31 patents
⚠️ This page may combine multiple inventors who share the name “SEO KATSUHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
23 patentsUS6160776ADec 12, 2000
Optical recording medium, and method of manufacturing optical recording medium
SONY CORP62 citations96
US6312780B1Nov 6, 2001
Optical recording medium
SONY CORP81 citations94
US6055218AApr 25, 2000
Recording medium having track formed of land portion and groove portion, and reproducing apparatus therefor
SONY CORP36 citations92
US5742577AApr 21, 1998
Prism has a plurality of reflective regions each with a predetermined phase difference
SONY CORP26 citations92
US5416762AMay 16, 1995
Improved disc cartridge and recording and/or reproducing apparatus having means for positioning a turntable and disc cartridge support structure and means for reducing vibrations
SONY CORP38 citations92
US5414687AMay 9, 1995
Disc recording/reproducing apparatus
SONY CORP29 citations92
US5329503AJul 12, 1994
Magneto-optical disc recording/reproducing apparatus
SONY CORP25 citations92
US6246644B1Jun 12, 2001
Optical pickup and method for manufacturing optical pickup
SONY CORP15 citations84
US5648944AJul 15, 1997
Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clock signals with different frequencies
SONY CORP7 citations74
US5627810AMay 6, 1997
Recording/reproducing apparatus that forms read and write clock signals with differing frequencies from the servo clock signals
SONY CORP7 citations74
US5428583AJun 27, 1995
Magneto-optical disc recording/reproducing apparatus
SONY CORP19 citations74
US5563869AOct 8, 1996
Prism has a plurality of reflective regions each with a predetermined phase difference
SONY CORP9 citations73
US7800986B2Sep 21, 2010
Optical pickup and optical disc apparatus
SONY CORP4 citations63
US7778141B2Aug 17, 2010
Optical pickup, optical disc device, polarization adjustment plate, and optical device
SONY CORP3 citations63
US7492676B2Feb 17, 2009
Optical pickup and optical disc apparatus including the same
SONY CORP3 citations63
US5249167ASep 28, 1993
Optical pickup apparatus which includes a plate-like element for splitting a returning light beam into different light beams having different focussing point
SONY CORP4 citations63
US8384045B2Feb 26, 2013
Minute particle analyzing device and method
SONY CORP3 citations62
US5577018ANov 19, 1996
Phase changing apparatus and optical pickup apparatus for magneto-optic storage device using same
SONY CORP4 citations62
US8014076B2Sep 6, 2011
Variable focal length lens, camera module, and electronic apparatus
SONY CORP1 citations52
US7336432B2Feb 26, 2008
Optical pickup and optical disc device
SONY CORP0 citations52
US8913242B2Dec 16, 2014
Fine particle measurement device
SONY CORP0 citations42
US7859953B2Dec 28, 2010
Optical pickup and optical disc apparatus
SONY CORP0 citations42
US7986593B2Jul 26, 2011
Optical integrated device, method for detecting light, optical pickup, and optical disc apparatus
SONY CORP0 citations40