SHADOWMASK OF MAKING METHOD

摘要

Both surfaces of a metal sheet except those regions in which small and large openings are to be formed are coated with resist films. The upper surface of the metal sheet is further coated with an organic synthetic film. Etching soln. is sprayed on the lower surface of the metal sheet kept in a substantially horizontal position to etch the region corresponding to the small opening so forming the small recesses. The metal sheet is then turned over and the regions corresponding to the large openings are etched until the large recesses are reached to the resistant layer. Resist film and the remaining resistant layer are then removed.