Retrace pulse generator having improved noise immunity

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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H01J 2972

Patent

active

039448835

ABSTRACT:
A deflection system, utilizing a deflection generator coupled to a deflection winding to provide a current in the deflection winding having a magnitude which is a function of the elasped time after a retrace pulse and which changes substantially linearly, includes a retrace pulse generator. The retrace pulse generator utilizes a first gating circuit to provide for controllable coupling between a source of trigger pulses having a first time interval therebetween and a first monostable retrace pulse generator circuit. Fixed width retrace pulses are thereby generated in response to trigger pulses. A second monostable circuit responsive to the retrace pulses is coupled to the first gate for inhibiting the flow of pulses through the first gate for a second interval of time which is less than the first interval of time. The first monostable circuit is therefore immune to noise pulses occurring during the second interval of time. A circuit coupled to the first and second monostable circuits develops trigger pulses for triggering the monostable retrace generator when the trigger pulses produced by the first source of trigger pulses have a time interval therebetween which is at least a predetermined time interval greater than the first time interval.

REFERENCES:
patent: 2753451 (1956-07-01), Cetrone
patent: 3428855 (1969-02-01), McDonald

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