Inventor
YUKAWA HIROAKI
JP11 patents
⚠️ This page may combine multiple inventors who share the name “YUKAWA HIROAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
8 patentsUS6980504B2Dec 27, 2005
Diffractive optical element with a pair of opposite surfaces projecting light on a photodetector
SONY CORP12 citations82
US6760296B1Jul 6, 2004
Optical integrated device, optical pickup and optical disk apparatus
SONY CORP10 citations73
US7443780B2Oct 28, 2008
Optical pickup device and optical disk device having a diffraction element so that a first light beam and a second light beam comport with each other
SONY CORP2 citations60
US6967907B2Nov 22, 2005
Optical pickup device and optical disk device having a diffraction grating
SONY CORP4 citations60
US6906991B1Jun 14, 2005
Optical head, optical recording and/or reproducing apparatus and integrated optical module
SONY CORP3 citations60
US7072271B2Jul 4, 2006
Optical head, optical recording and/or reproducing apparatus and integrated optical module
SONY CORP0 citations50
US7990832B2Aug 2, 2011
Optical pickup including plural light sources and recording and/or reproducing apparatus for an optical recording medium
SONY CORP0 citations39
US7583570B2Sep 1, 2009
Optical pickup and disc drive apparatus
SONY CORP0 citations38