Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1974-11-07
1976-03-30
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315408, H01J 2974
Patent
active
039477240
ABSTRACT:
An improved sweep generator circuit suitable for deflection circuits in television receivers conventionally includes a condenser chargeable through a resistance to establish the sweep. A resistive voltage divider and a threshold comparator circuit are each arranged parallel to the condenser. The comparator circuit is triggerable to establish a low impedance discharge path across the condenser when the charging voltage across the condenser exceeds a normal reference voltage from the voltage divider. The frequency of the generator is made variable in response to a synchronization frequency within predetermined limits by shunting a resistance of the voltage divider by a control resistance through an electronic switch that is triggerable by the sync pulse train. Normally the minimum sync interval determins the heighest frequency of the sweep generator; if an additional (disturbance) pulse occurs within such minimum sync interval to prematurely establish the shunt connection of the control resistance, the condenser will not have had time to charge up to a value sufficient to reach the then-reduced reference voltage, and the comparator circuit will remain in its high impedance condition until the condenser voltage has attained a value equal to the normal reference voltage of the divider.
REFERENCES:
patent: 3343006 (1967-09-01), Attwood
Blum T. M.
Loewe-Opta GmbH
Wilbur Maynard R.
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