Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-11-10
1983-02-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 44, 369 45, G01J 120
Patent
active
043743242
ABSTRACT:
In order to improve the focussing of radiation from a source onto an object, in example for a "VLP" or "Compact Disk" system, a further control signal from an object-inclination detector is added to the focussing error signal, yielding improved control stability and smaller focussing errors.
REFERENCES:
patent: 3932700 (1976-01-01), Snopko
patent: 4301527 (1981-11-01), Tsonoda et al.
Opheij Willem G.
van Rosmalen Gerard E.
Briody Thomas A.
Mayer Robert T.
Nelms David C.
Tamoshunas Algy
U.S. Philips Corporation
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