Inventor
HIGASHIURA KAZUO
JP5 patents
Patents
5 patentsUS5761174AJun 2, 1998
Optical pickup device with split hologram element that diffracts light in direction parallel to track
SANKYO SEIKI SEISAKUSHO KK16 citations73
US6167017ADec 26, 2000
Optical head assembly having means for detecting tracking errors based on astigmatisms generated by returning beams
SANKYO SEIKI SEISAKUSHO KK11 citations72
US5357280AOct 18, 1994
Automatic focusing apparatus using scanning line weighting of a video signal to determine an in-focus condition
SANKYO SEIKI SEISAKUSHO KK15 citations70
US5929907AJul 27, 1999
Automatic focusing apparatus using scanning line weighting of a video signal to determine an in-focus condition
SANKYO SEIKI SEISAKUSHO KK2 citations59
US6184512B1Feb 6, 2001
Semiconductor laser apparatus and optical pickup apparatus
SANKYO SEIKI SEISAKUSHO KK1 citations51