Zenith Electronics Corporation

Eugene A Babicz

Richard M Gorski

Hsing-Yao Chen

A three beam, in-line, color CRT electron gun is disclosed for use in high resolution tubes with self convergent yokes. The dynamic quadrupole and main lenses of the gun are complementary to provide emitted beams that are radially symmetrical and of like size and shape, and of constant horizontal dimension and focal length throughout the deflection cycle, thus letting the yoke provide for the correct beam focus upon deflection. Vertical emitted-beam dimension is balanced against the yoke compressive force and the increased deflected beam throw distance to provide well-controlled spot sizes.

Constant horizontal dimension symmetrical beam in-line electron gun

For use particularly in a color cathode ray tube electron gun, means for diverting an electron beam from a straight line path. The beam diverting means has general utility, but is disclosed as part of a quadrupole lens for correcting astigmatism introduced by an associated self-converging yoke. The beam bending feature in the dynamic quadrupole compensates for convergence errors undesirably introduced by the dynamic focus voltage.

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Evanston, IL, United States of America

Eugene A Babicz