Color cathode ray tube having correction plate electrodes mounte

Details Color cathode ray tube having correction plate electrodes mounte Color cathode ray tube having correction plate electrodes mounte

1997-08-25

1999-03-23

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313446, 313449, H01J 2950

Patent

active

058864628

ABSTRACT:
A color cathode ray tube includes a phosphor screen, a shadow mask closely spaced from the phosphor screen and electron gun. The electron gun has a plurality of electrodes including a plurality of cathodes for emitting a plurality of in-line electron beams, a control grid having a plurality of in-line apertures centered with the cathodes, an accelerating electrode, a cup-shaped focus electrode and a cup-shaped anode fixed on insulating supports. Each of the cup-shaped focus electrode and anode has at a first end face thereof opposing the other of the cup-shaped focus electrode and anode, a single opening surrounded by a rim formed by turning in the end face thereof toward an interior thereof. Each of said cup-shaped focus electrode and anode has a correction plate electrode therein, has a step on an inner wall thereof at a position set back from the first end face thereof to provide a first portion having an inside diameter larger on an open end side thereof opposite the first end face, than that of a second portion thereof on a side of the first end face. The correction plate electrode is pressed against the step and fixed to the cup-shaped electrode, or is fixed in the second portion of the smaller inside diameter.

REFERENCES:
patent: 4668892 (1987-05-01), Peels

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