Inventor
OOYAMA NORIYOSHI
JP3 patents
Patents
3 patentsUS4767921AAug 30, 1988
Optical pickup device wherein the astigmatic converged beam spot is aligned along the dividing lines of the four-division photo-detector
SANYO ELECTRIC CO21 citations79
US5136565AAug 4, 1992
Optical device for reading and writing data on a recording medium
SANYO ELECTRIC CO15 citations71
US7672202B2Mar 2, 2010
Optical pickup apparatus
SANYO ELECTRIC CO0 citations39