Slotted shadow mask having apertures spaced to minimize moire

摘要

A color picture tube having a shadow mask is disclosed in which, with a view to making occurrence of moire imperceptible, electron beam transmissive apertures of the shadow mask are formed in such an array that a plurality of trains of the electron beam transmissive apertures each arrayed in the vertical direction with a pitch P.sub.y are juxtaposed to one another, wherein, assuming that the order of the harmonics is represented by n and m is an odd number smaller than 2n, there exist the relations (n-0.5)P.sub.l ≦P.sub.y ≦(n+0.05) P.sub.l and (m-0.35)P.sub.y /2n≦&Dgr;y≦(m+0.35)P.sub.y /2n among the pitch P.sub.y, pitch P.sub.l of scanning lines and vertical deviation &Dgr;y between two adjacent apertures in the horizontal direction.