Raster width correction apparatus for multi scan frequency monit

Details Raster width correction apparatus for multi scan frequency monit Raster width correction apparatus for multi scan frequency monit

1986-08-18

1987-06-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

046773509

ABSTRACT:
In a deflection circuit that operates in any scan frequency selected from a plurality of frequencies, the supply voltage that is DC-coupled to a first terminal of a trace capacitor is increased when the scan frequency increases. The deflection circuit includes a diode modulator that is controlled by a modulation voltage having an AC component voltage that varies at a vertical rate. The increase in the supply voltage causes an increase in a DC component voltage of the modulation voltage that is coupled to a second terminal of the trace capacitor such that the voltage in the trace capacitor increases in the same proportion as the supply voltage. The proportional increase in the trace capacitor voltage maintains the raster width unchanged when the scan frequency increases.

REFERENCES:
patent: 4329729 (1982-05-01), Knight
patent: 4565949 (1986-01-01), Haferl
patent: 4625154 (1986-11-01), Willis

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