Circuit for minimizing edge hooking in television camera...

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

H - Electricity

01

J

355/19

H01J 29/72 (2006.01) H04N 5/228 (2006.01)

Patent

CA 1182929

ABSTRACT OF THE DISCLOSURE 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 inter- vals, 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.

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