Inventor
OBA AKITOMO
JP3 patents
Patents
3 patentsUS5659531AAug 19, 1997
Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein
NEC CORP24 citations90
US5883741AMar 16, 1999
Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein
NEC CORP15 citations80
US5535055AJul 9, 1996
Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein
NEC CORP14 citations80