Back to results
US 4,054,816 AGranted
Sweep circuit for cathode-ray tube display
AssigneeInternational Business Machines Corporation
InventorSteven Dennis Keidl
Life of this patent
Estimating the term…
Abstract
A recurrent digital sweep signal starts an integrator fed by a constant current. The integrator includes push-pull Darlington stages, which act as alternately conducting controlled current sources for split deflection coils outside the integrator feedback loop. A phase shifter provides arcsine correction. A time-out circuit avoids excessive dissipation if the sweep signal should be lost.
Claims9
A sweep circuit for a cathode-ray tube display, comprising:
- a reference for producing a constant reference signal;
- an integrator responsive to said reference signal and having a feedback loop for producing a drive signal with a rate of change determined by said reference signal;
- and
- driver means being responsive to said drive signal for passing a time-varying output current through a deflection-coil means, said driver means having a sensor receiving said output current and coupled to said feedback loop, said deflection coil means being connected outside said feedback loop;
- and
- trigger means coupled to said integrater and to said reference, for resetting said drive signal to a value determined by said reference signal.
3 more elements
Dependencies are inferred from the claim text.