Controlled system for focussing a read-out light beam

Details Controlled system for focussing a read-out light beam Controlled system for focussing a read-out light beam

1974-11-14

1976-04-20

Borchelt, Archie R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

1791003V, G01J 120

Patent

active

039521915

ABSTRACT:
A controlled system for focussing a read-out light beam onto a moving track carrying information, comprising: a focussing objective lens for forming a periodic motion along its optical axis, under the action of a pilot device; a comparator comparing the pilot signal with the envelope of an electrical read-out signal, the comparator thus producing a focussing error signal, and means for applying said signal to the focussing objective lens for correction purposes.

REFERENCES:
patent: 3716845 (1973-02-01), Chaffin
patent: 3736057 (1973-05-01), Harvey
patent: 3825323 (1974-07-01), Landwer
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3848095 (1972-12-01), Wohlmut et al.
patent: 3854015 (1974-12-01), Janssen
patent: 3876827 (1975-04-01), Janssen

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