Inventor
YAMAMOTO ETSUFUMI
JP8 patents
Patents
8 patentsUS5181195AJan 19, 1993
Tracking error signal generator with dc offset cancellation
SONY CORP24 citations91
US6134198AOct 17, 2000
Optical disc apparatus and tracking error signal calculation circuit
SONY CORP16 citations83
US5181193AJan 19, 1993
Optical pickup device for a recording and/or reproducing apparatus
SONY CORP13 citations73
US5144614ASep 1, 1992
Optical pickup device
SONY CORP9 citations73
US4897828AJan 30, 1990
Optical pickup device
SONY CORP10 citations73
US4893296AJan 9, 1990
Optical pickup device
SONY CORP15 citations73
US6130868AOct 10, 2000
Apparatus and method for controlling rotational speed during a pause operation
SONY CORP5 citations60
US5606537AFeb 25, 1997
Method of adjusting optics of optical pickup using error negating signal processing technique
SONY CORP1 citations50