Color cathode ray tube

摘要

The present invention provides an excellent color cathode ray tube of a black matrix type which can reduce the irregularities of a phosphor screen, can exhibits the uniformity of screen, can exhibit the favorable quality of screen, and can obtain the image display of high quality. The size T of a boundary portion between a large hole and a small hole of each electron beam aperture formed in a shadow mask is made small and the surface roughness of an inner surface is made small so that the Irregularity index which expresses the uniformity of the phosphor screen can be set to a value not greater than 7%.