H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.12
H01J 29/70 (2006.01) H01J 29/48 (2006.01) H01J 29/50 (2006.01)
Patent
CA 1068321
ABSTRACT OF THE DISCLOSURE This disclosure depicts an electron gun for use in a color cathode ray tube of a small neck, shadow mask type. The gun includes an extended field lens for generating a cluster of electron beams converged and individually focused at the screen of the tube. Three main focus lens means are situated on lens axis which are mutually parallel and parallel to a gun central axis. At least two of the lens axes are off-axis with respect to the gun axis. The focus lens means has for each beam at least three electrodes including a focus electrode for receiving a potential for electrically adjusting the focus of the beam. In succession down-beam, there at least two associated electrodes having potentials thereon which form in the gaps between adjacent electrodes significant main focus field components. To adjust beam focus, the strength of a first of these components is controlled by the voltage received by the focus electrode. The strength of a second of the field components is relatively less than that of the first component. Each of the lens means is character- ized by having addressing faces of the associated electrodes which define the second field component being so structured and disposed as to cause the second field component to be asymmetrical and effective to significantly divert the beam from its path resulting in convergence of the beams without any significant distortion of the beams and substantially indepen- dently of any beam-focusing adjustments of the first field component.
264090
Blacker Allen P.
Schwartz James W.
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