A New Form of Extended Field Lens for Use in Color Television Picture Tube Guns

Small neck inline beam color picture tubes and self-convergent yokes are rapidly gaining in popularity. The principal incentive for this trend is, of course, the cost savings resulting from self-convergence. Although this combination produces competitive performance in small picture sizes, conventional small neck, bi-potential, inline guns do not produce adequate resolution for large screen sizes. Zenith´s new 19V 100°ABLE tube(l) employs a new extended field lens (EFL) gun which overcomes this limitation. This extended field lens utilizes a novel axial potential distribution. Spot size performance for the gun is significantly better than that of contemporary large neck delta gun tubes.