Color cathode-ray tube and method for producing the same

A color cathode-ray tube, comprising:

• an envelope having a funnel composed of a funnel portion and a neck, and a panel;
• a phosphor screen provided on an inner wall of the panel;
• an electron gun provided in an inner space of the neck, and having a beam generating portion for controlling generation of three electron beams arranged in an in-line direction, a plurality of focusing electrodes for controlling a focusing of the three electron beams, and an anode;
• and
• an inner conductive film formed on an inner wall of the funnel portion and in a part of an inner wall of the neck, and electrically connected to the anode,
• the color cathode-ray tube further comprising a conductive film isolated from the inner conductive film on the inner wall of the neck,
• wherein, assuming that, among the plurality of focusing electrodes, a position in a tube axis direction of an end on the anode side of an anode-side focusing electrode placed at a position closest to the anode side is P0,
• 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 the beam generating portion side of an electrode placed at a position closest to the beam generating portion side is P1, and
• in the tube axis direction, a position of an end on the beam generating portion side of the conductive film is PL1, and a position of an end on the panel side of the conductive film is PL2,
• in the tube axis direction, the position P0 is placed between the position PL1 and the position PL2,
• assuming that a distance in the tube axis direction from the position P0 to the position PL1 is L1, a distance in the tube axis direction from the position P0 to the position PL2 is L2, and a distance in the tube axis direction from the position P0 to the position P1 is L3, the following relationships:
• L1>L2
• L1<L3
• are satisfied, and
• in a direction orthogonal to a tube axis and the in-line direction, a range occupied by the conductive film includes and is larger than a range occupied by the anode-side electrode focusing electrode.