ES421074A1 - A perfect method of manufacturing a color selecting electrode for color image tubes. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

An improved method of manufacturing a color imager for color picture tubes of the type having electronic barrel means and a phosphorescent screen including embossed areas of phosphorescent materials smaller than the areas of the parts of said phosphorescent screen subjected to the scanning of the electron beams of said electronic gun means, the method comprising the operations of forming a pattern of openings in an electrode plate, the pattern of which is useful for making said phosphorescent zones designed, and widening said openings of said electrode plate up to predetermined dimensions to obtain said color-picking electrode, in which the improvement lies in the fact that said first mentioned operation comprises the formation of a layer of FE3 O4 on each of the surfaces of said plate electrode, the drawing of said Fe3 O4 layers according to the aforementioned drawing d and openings until partially discovering said electrode plate, the chemical attack of said electrode plate with a chemical attack agent of FeCL3 to form said drawing of openings, and in which said second operation mentions includes the chemical attack of said plate electrode with a FeCL3 chemical etching agent to widen said openings, the removal of the remaining FeO4 layers from both surfaces of the mentioned electrode plate and the formation of Fe3O4 films on the two surfaces of said electrode plate and in the walls of the openings thus widened. (Machine-translation by Google Translate, not legally binding)