Horizontal deflection circuit having a variable retrace period

Details Horizontal deflection circuit having a variable retrace period Horizontal deflection circuit having a variable retrace period

1986-04-18

1987-11-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

047059931

ABSTRACT:
A horizontal deflection circuit comprises an oscillator responsive to a horizontal sync pulse applied thereto for generating a first oscillation at the frequency of the sync pulse. A first switching device is responsive to a first half cycle of the first oscillation to cause a ramp current to be generated in a resonant circuit. The resonant circuit comprises a deflection coil and a first capacitor to produce a second, half-cycle oscillation immediately following a complete cycle of the first oscillation to define the retrace period of the circuit. A second switching device when enabled is responsive to a second half cycle of the first oscillation. The second switching device is enabled by operating a manually controlled switch. The enabled second switching device intermittently couples a second capacitor to the first capacitor of the resonant circuit to vary the retrace period.

REFERENCES:
patent: 4019093 (1977-04-01), Klein
patent: 4238714 (1980-12-01), Sumi
patent: 4513228 (1985-04-01), Teuling

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