Color picture tube having an improved expanded focus lens...

Details Color picture tube having an improved expanded focus lens... Color picture tube having an improved expanded focus lens...

H - Electricity

01

J

313/35.13

H01J 29/62 (2006.01) H01J 29/48 (2006.01) H01J 29/50 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1182163

ABSTRACT An improved color picture tube has an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams, formed by two spaced electrodes each having three separate inline apertures therein. Each electrode also includes a peripheral rim. The peripheral rims of the two electrodes face each other. The apertured portion of each electrode is within a recess set back from the rim. The recess in at least one of the electrodes has a width at the center beam path that is wider than its width at the side beam paths, measured perpendicular to the plane containing the electron beam paths.

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