Focus correction system for video disc player

Details Focus correction system for video disc player Focus correction system for video disc player

1975-07-02

1978-06-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 358128, G01J 120

Patent

active

040977307

ABSTRACT:
A focus correction system exhibits an enhanced acquisition range by responding to a focus-servo pilot signal recorded on a video disc with the same spatial phase distribution in each turn of a multi-turn information storage track.

REFERENCES:
patent: 1891227 (1932-12-01), Friebus
patent: 3038369 (1962-06-01), Davis
patent: 3381086 (1968-04-01), Moss et al.
patent: 3530258 (1968-06-01), Gregg et al.
patent: 3847485 (1974-11-01), Zanoni
patent: 4025784 (1977-05-01), Lehureau et al.

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