Inventor
IMADA NOBUO
JP5 patents
Patents
5 patentsUS5872761AFeb 16, 1999
Optical disk apparatus and optical head thereof
HITACHI LTD17 citations92
US5699341ADec 16, 1997
Optical disk apparatus and optical head thereof
HITACHI LTD19 citations92
US5404344AApr 4, 1995
Recording/reproducing optical head producing focusing error signal from zero-th order diffracted light and tracking error signal from first order diffracted light
HITACHI LTD23 citations92
US6069862AMay 30, 2000
Compact optical head including two light emitters having parallel optical axes
HITACHI LTD9 citations73
US6388976B1May 14, 2002
Compact optical head including two light emitters having parallel optical axes
HITACHI LTD4 citations62