Color cathode-ray tube and method for producing the same

Details Color cathode-ray tube and method for producing the same Color cathode-ray tube and method for producing the same

2008-01-01

2008-01-01

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Envelope

C313S417000, C313S450000, C313S456000, C315S003000, C315S382000, C315S382100, C445S034000, C445S036000

Reexamination Certificate

active

11247366

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 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 a beam generating portion side of an electrode placed at a position closest to the beam generating portion side is P1; in the tube axis direction, a position of an end on the beam generating portion side of the conductive film is PL1and a position of an end on the panel side of the conductive film is PL2, the position P0is placed between the position PL1and the position PL2. Assuming that the distances from the position P0to the positions PL1, PL2, P1are L1, L2, L3, respectively, relationships: L1>L2and L1<L3are 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.

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