A method of drape drawing of a shadow mask for a color display tube, a shadow mask manufactured by this method, and a color display tube including such a shadow mask

摘要

A shadow mask sheet 1 for a colour display tube consisting of an iron-nickel alloy of the invar type is drape drawn by means of a drawing process. During said drawing process the shadow mask sheet 1 is provided with a skirt 2. By keeping the rim 16 of the skirt 22 clamped in a slip-free manner during the drawing process, the skirt 22 can be plastically deformed simultaneously with the formation of the skirt 22, as a result of which the reproducibility of the shape of the shadow mask sheet 1 is increased.