Shadow mask type color cathode ray tube with shadow mask effective to minimize the appearance of Moire patterns

摘要

A color cathode ray tube which includes an evacuated envelope having a phosphor deposited screen and an electron gun assembly positioned in opposition to the phosphor deposited screen and operable to emit electron beams towards the phosphor deposited screen, and an apertured shadow mask disposed inside the envelope in the vicinity of and generally parallel to the phosphor deposited screen and spaced a predetermined distance from the phosphor deposited screen. The pitch between each of the neighboring apertures in the shadow mask as measured in a vertical direction perpendicular to a horizontal scanning line is chosen to be a value variable as a function of the distance away from the center of the phosphor deposited screen.