Color cathode ray tube comprising an in-line electron gun with extended outer apertures

A colour cathode ray tube comprising an in-line electron gun for generating three coplanar electron beams, said electron gun having a main lens portion comprising a first lens electrode and a second lens electrode, said first and second lens electrodes each having an aperture which is common to the three electron beams, which common aperture is bounded by an edge, and said lens electrodes each having a central aperture and two outer apertures for allowing passage of, respectively, the central and outer electron beams, said central and outer apertures being situated in a plate-shaped part which is arranged in the relevant lens electrode at some distance from and recessed with respect to the common aperture, said common apertures of the first and second lens electrodes facing each other, characterized in that in both the first and the second lens electrodes, the outer apertures in the plate-shaped part are formed such that, viewed in projection on the plate-shaped part and from the other lens electrode, the outer apertures extend in the in-line plane beyond the edge of the common aperture, said outer apertures being entirely enclosed in said plate-shaped part.