Color cathode-ray tube and method for producing the same

Abstract

A conductive film isolated from an inner conductive film is formed on an inner wall of a neck. Assuming that, among a plurality of focusing electrodes constituting an electron gun, a position in a tube axis direction of an end on an anode side of an anode-side focusing electrode placed at a position closest to the anode side is P; among electrodes supplied with substantially the same voltage as that of the anode-side focusing electrode and arranged continuously from the anode-side focusing electrode, a position in the tube axis direction of an end on a beam generating portion side of an electrode placed at a position closest to the beam generating portion side is P; in the tube axis direction, a position of an end on the beam generating portion side of the conductive film is PLand a position of an end on the panel side of the conductive film is PL, the position Pis placed between the position PLand the position PL. Assuming that the distances from the position Pto the positions PL, PL, Pare L, L, L, respectively, relationships: L>Land L<Lare satisfied. Furthermore, in the vertical direction, a range occupied by the conductive film includes and is larger than a range occupied by the anode-side focusing electrode. This can suppress the convergence drift of three electron beams to enhance color purity.