Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-04-14
1979-01-16
Dahl, Lawrence J.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
1791003V, 358128, G01J 120
Patent
active
041350839
ABSTRACT:
An optical scanning device scans recording tracks on a record carrier with the aid of a beam of radiation, while an objective, which concentrates the beam of radiation to a scanning spot, performs automatic electrically controlled movements in a direction perpendicular to the plane of the record carrier with the aid of a focussing bearing arrangement, so as to ensure a continuous focussing of the scanning spot on the recording tracks. Moreover, in order to follow the oscillations of the recording track, the objective also performs electrically controlled movements which are such that the scanning spot moves at least substantially parallel to the plane of the record carrier.
REFERENCES:
patent: 4032776 (1977-06-01), Van Rosmalen
patent: 4063287 (1977-12-01), Van Rosmalen
patent: 4074312 (1978-02-01), Van Rosmalen
Boonstra Lieuwe
Dekker Francois D.
van Alem Antonius A. M.
Van de Veerdonk Johannes T. A.
Cohen Simon L.
Dahl Lawrence J.
Trifari Frank R.
U.S. Philips Corporation
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