Patent ID: 7030547

Claim:
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: SL 1 <SL 2 <SL 3 , SW 1 <SW 2 <SW 3 , BH 1 >BH 2 >BH 3 , BV 1 >BV 2 >BV 3 , where SL 1 , SL 2 and SL 3 are lengths of long sides of rectangular through holes in outermost columns, columns next to said outermost columns, and remaining columns, of said plurality of columns, respectively, SW 1 , SW 2 and SW 3 are lengths of short sides of rectangular through holes in said outermost columns, said columns next to said outermost columns, and said remaining columns, of said plurality of columns, respectively, BH 1 , BH 2 and BH 3 are vertical bridge widths between adjacent ones of said rectangular through holes in said outermost columns, said columns next to said outermost columns, and said remaining columns, of said plurality of columns, respectively, and BV 1 , BV 2 and BV 3 are a horizontal distance between adjacent ones of said rectangular through holes in said outermost columns and said columns next to said outermost columns, a horizontal distance between adjacent ones of said rectangular through holes in said columns next to said outermost columns and columns adjacent to said columns next to said outermost columns, in said remaining columns, and a horizontal distance between adjacent ones of said rectangular through holes in adjacent ones of said remaining columns, respectively.