Inventor
ROBERTS SPENCER D
US4 patents
Patents
4 patentsUS5038333AAug 6, 1991
Positioning systems including reliable track crossing detection for high speed relative motions
IBM59 citations94
US4914725AApr 3, 1990
Transducer positioning servo mechanisms employing digital and analog circuits
IBM86 citations93
US4125881ANov 14, 1978
Tape motion control for reel-to-reel drive
IBM88 citations92
US5128913AJul 7, 1992
Acquiring focus in an optical system using a soft focus acquiring system
IBM3 citations61