Colour display tube

Details Colour display tube Colour display tube

H - Electricity

01

J

313/35.12

H01J 29/51 (2006.01) H01J 29/48 (2006.01)

Patent

CA 1183195

19 ABSTRACT: Of an electron gun system for a colour display tube with which three electron beams situated in one plane are generated, the second electrode is formed by a beaker- shaped portion, in which a first plate is connected to the bottom portion and a second plate is connected to the open end. The apertures for the outermost electron beams in the beaker-shaped portion are situated eccentrically with respect to the apertures for the outermost electron beams in the first electrode. The apertures for the outermost electron beams in the first plate and the second plate, respectively are situated eccentrically with respect to the apertures in the beaker-shaped portion. As a result of this, an asymmetric lens field is generated in the second electrode for the two outermost electron beams a the area of the cross-over, which field deflect the outer- most electron beams in such manner that three electron beams converge on the display screen. By deflecting the outermost electron beams substantially at the area of the cross-over the convergence of the electron beams is sub- stantially independent of variations in the potential of the second electrode and the first focusing electrode. The axes of the apertures for the outermost electron beams in the focusing electrodes are situated substantially on the axis of the outermost electron beams already deflected over the convergence angle in the second electrode. As a result of this symmetrical focusing lens fields are wormed so that in the case of variations in the potential of the focusing electrodes only the focusing is influenced with- out influencing the convergence of the electron beams.

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