COLOR CATHODE-RAY TUBE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube capable of preventing the adhesion and survival of black pieces generated in trimming of an optical filter layer, and eliminating display defects. SOLUTION: In the manufacturing process of the color cathode-ray tube, length from a panel seal end surface to the peeling off end of a black layer [trimming dimension (a)] in the trimming process of the black layer is made longer than length from the panel seal end surface to the peeling off end of a filter layer [trimming dimension (b)] in the trimming process of an optical filter layer.