Color Tolerance Award preparation of the color selection electrode

摘要

The electrode comprises a shadow mask blank having a pattern of apertures. The patterns are provided in a steel foil by means of a photo-etching process. Mask blanks are cut from the steel foil, with each blank having a pattern of apertures. In order to facitate subsequent drawing, a stack of mask blanks are annealed at a max. temp. above the temp. at which the blanks begin to stick together. Each mask blank is then deep-drawn to form an electrode. To separate annealed blanks while avoiding damage, the mask blanks are placed on a curved substrate before annealing, and are annealed off the substrate.