Magnetic deflection field enhancer means for television CRT elec

Details Magnetic deflection field enhancer means for television CRT elec Magnetic deflection field enhancer means for television CRT elec

1980-09-29

1985-10-15

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, H01J 2950

Patent

active

045476985

ABSTRACT:
An in-line electron gun in a color TV cathode ray tube generates three coplanar electron beams. The raster pattern projected by the center beam is diminished in vertical height so as to be non-coextensive with the two off-axis beams. The gun is characterized by having two pairs of inwardly converging but non-intersecting magnetic field enhancer means, one of each pair being located at a point of beam egress and embracing in symmetrical relationship one of the off-axis beams. Each member of each of the pairs comprises an L-shaped bracket with the brackets defining an opening therebetween, with one leg of each bracket providing for attachment to the electrode. The brackets, the predetermined angle and distance, and their separation and length are such that the enhancer means is effective to divert the flux of the vertical deflection field through the openings between the enhancer means. As a result, the vertical height of the raster pattern of the center beam is enhanced into coextensiveness with the raster patterns of the off-axis beams.

REFERENCES:
patent: Re29895 (1979-01-01), Murata et al.
patent: 3548249 (1970-12-01), Yoshida et al.
patent: 3860850 (1975-01-01), Takenaka et al.
patent: 4196370 (1980-04-01), Hughes
patent: 4225804 (1980-09-01), Bekaert et al.

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