Color picture tube

Details Color picture tube Color picture tube

1979-10-16

1982-09-21

Karlsen, Ernest F.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313445, 313457, H01J 2946

Patent

active

043509240

ABSTRACT:
A color picture tube with an in-line multi-stage focusing type electron gun assembly which can suppress generation of spark discharges and which can be improved in withstand voltage characteristics. The electron gun assembly comprises a metallic shielding member facing the fluorescent screen and maintained at the anode potential. The shielding member is displaced, in the direction of a tube axis and toward the base, from an edge facing the base of an inner graphite coating formed on the inner wall of the neck tube by a predetermined distance or more. The metallic shielding member shields electrostatically the edge of the inner graphite coating from the grid electrodes and cathode electrode close to the base and at lower potentials. At least one of focusing voltage feed conductors for third and fifth grid electrodes is wired so as to run through a gap between the inner wall of the neck tube and a bead glass for supporting the electrodes of the electron gun assembly.

REFERENCES:
patent: 4153857 (1979-05-01), Delsing et al.

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