Patent ID: 7030547
Filing Date: 2006-04-18
Classification: H01J

Abstract:
1. A color cathode ray tube comprising: a vacuum envelope having an approximately rectangular panel portion having a phosphor film formed on an inner surface thereof, a neck portion housing an electron gun and a funnel portion which connects the neck portion and the panel portion; an approximately rectangular color selection electrode having a major surface which faces the phosphor film and in which a plurality of electron beam apertures are formed, and skirt portions which are formed in a shape of a frame by being bent toward the neck portion from peripheries of long sides and short sides of the major surface; and a mask frame which holds the skirt portions of the color selection electrode by being welded to the skirt portions, wherein the color selection electrode includes a plurality of rectangular through holes in the skirt portions, the plurality of rectangular through holes are comprised of a plurality of columns of rectangular through holes, said columns being arranged in a lengthwise direction of corresponding ones of the skirt portions, and each of the plurality of columns of through holes is comprised of rectangular through holes arranged in a widthwise direction of the corresponding ones of the skirt portions, and wherein the following inequalities are satisfied: where SL SW BH BV