Raster correction circuit

Details Raster correction circuit Raster correction circuit

1992-04-23

1993-03-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2956

Patent

active

051947846

ABSTRACT:
In a deflection apparatus which corrects for inside barrel distortion, a horizontal deflection winding and a retrace capacitance form a retrace resonance circuit during a retrace interval. A trace capacitance forms a trace resonant circuit with the deflection winding during the trace interval. A circuit branch, that includes a second capacitance and an inductance, is coupled to the deflection winding, during the trace interval. The circuit branch forms a second resonant circuit with the trace capacitance having a resonance frequency that is higher than a frequency of a deflection current in the deflection winding. A current in the circuit branch, that is modulated in a vertical rate, modulates the deflection current in a manner to reduce inside barrel distortion.

REFERENCES:
patent: 3944879 (1976-03-01), Suzuki
patent: 4088931 (1978-05-01), Haferl
patent: 4140949 (1979-02-01), Terry
patent: 4169988 (1979-10-01), Fecht
patent: 4182978 (1980-01-01), Boekhorst
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 4565949 (1986-01-01), Haferl
patent: 4719392 (1988-01-01), Haferl
patent: 4823052 (1989-04-01), Onozawa et al.
patent: 4935675 (1990-06-01), Ochiai
patent: 5043637 (1991-08-01), Gries et al.
patent: 5059874 (1991-10-01), Oliver

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