Circuit for minimizing edge hooking in television camera pickup

Details Circuit for minimizing edge hooking in television camera pickup Circuit for minimizing edge hooking in television camera pickup

1981-03-30

1983-09-13

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, 315395, H01J 2956

Patent

active

044044992

ABSTRACT:
Selected additional voltages are utilized to modify the respective horizontal and vertical sawtooth waveforms which generate the horizontal and vertical electron beam scans in a photoelectric tube. The added voltages are selectively applied during the respective horizontal and vertical blanking intervals, whereby the speed of the scan is doubled, tripled, etc., during the blanking intervals. Since the time available during blanking is still the same, increasing the speed of the beam scan causes the beam to scan correspondingly further into the non-scanned target portion. Thus, corresponding greater distances into the surrounding target are discharged which, in turn, circumvents charge bleeding into the active picture area, thereby precluding edge hooking.

REFERENCES:
patent: 3755707 (1973-08-01), Fremont
patent: 3857059 (1974-12-01), Larson
patent: 4038581 (1983-03-01), Dorsey et al.

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