Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-03-08
1976-01-06
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178DIG29, H04N 534
Patent
active
039314669
ABSTRACT:
An automatic control to the optimum lens adjustment in an ACT gun in a television camera tube. A variation in the cathode and control electrode potential during the line flyback requires an adaptation of the lens voltage for optimum target erasing action. In the circuit a measurement of the anode current in the gun is effected because for an optimum target erasing action during the line flyback it is found that this current must be at a minimum. A measurement is effected about an adjusting point. In case of unequal current the optimum value is not yet reached and an adjusting point displacement is effected towards the optimum value whereafter a subsequent measurement is effected.
REFERENCES:
patent: 3392236 (1968-07-01), Nielsen et al.
patent: 3548250 (1970-12-01), Van Roosmalen et al.
patent: 3602642 (1971-08-01), Van Den Auoort et al.
patent: 3610823 (1971-10-01), Haenen et al.
patent: 3708617 (1973-01-01), Caraba et al.
patent: 3764923 (1973-10-01), Woodworth et al.
Griffin Robert L.
Saffian Mitchell
Steckler Henry I.
Trifari Frank R.
U.S. Philips Corporation
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