Patent ID: 6731054
Filing Date: 2004-05-04
Classification: H01J

Abstract:
A shadow mask for use in a cathode ray tube, comprising:a mask body having a mask effective section where a number of electron beam passage apertures are formed and a skirt portion provided at a peripheral edge of the mask effective section; and a mask frame arranged outside the skirt portion and resistance-welded to the skirt portion at a plurality of portions, wherein the skirt portion includes an outer surface in contact with the mask frame, an inner surface positioned opposite to the outer surface, and at least one of: (i) a plurality of concave portions and (ii) a plurality of convex portions formed on that region of the inner surface of the skirt portion which a contact surface of an electrode for resistance-welding contacts, in each of the welding portions, said at least one of: (i) the plurality of concave portions and (ii) the plurality of convex portions each having a smaller area than an area of the contact surface of the electrode, the contact surface of the electrode having a diameter smaller than a width of the skirt portion.