Inventor
NAGAHAMA TOSHIYA
JP9 patents
Patents
9 patentsUS5111449AMay 5, 1992
Optical pick-up device using diffraction grating element having two sub-regions
SHARP KK34 citations92
US4904856AFeb 27, 1990
Optical pickup device with diffraction sensing
SHARP KK45 citations92
US7483360B2Jan 27, 2009
Optical pickup device using polarizing hologram element and hologram laser therefor
SHARP KK8 citations83
US5049732ASep 17, 1991
Optical pickup device with diffraction device
SHARP KK20 citations82
USRE35332ESep 24, 1996
Optical pickup device with diffraction device
SHARP KK8 citations73
US5408450AApr 18, 1995
Optical pickup apparatus
SHARP KK19 citations73
US7649825B2Jan 19, 2010
Splitting element, light emitter, and optical pickup apparatus
SHARP KK7 citations61
US5272329ADec 21, 1993
Optical pickup device using a holographic optical element and an amplifier
SHARP KK5 citations60
US6847665B2Jan 25, 2005
Semiconductor laser device and method for producing the same
SHARP KK3 citations57