High-current cathode for picture tubes including a grid 3-electr

Details High-current cathode for picture tubes including a grid 3-electr High-current cathode for picture tubes including a grid 3-electr

1995-12-14

1997-06-10

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313270, H01J 2950

Patent

active

056379528

ABSTRACT:
An electron-beam gun system is provided having a cathode arrangement and a grid electrode. The cathode arrangement is a high-current cathode (22) having an emitting surface (23). The grid electrode includes a hat-shaped grid 1-electrode (24) located at a distance of 30 to 80 .mu.m from the emitting surface (23) of the high-current cathode (22), which has a width in a range of 30 to 70 .mu.m in a passing area (18.2) for electrons. The grid electrode includes a grid 2-electrode (15) that is at least 250 .mu.m wide in a passing area (18) for the electrons, and includes a grid 3-electrode (14) having an inlet side that is 250 to 400 .mu.m wide in a passing area (18.1) for the electrons.

REFERENCES:
patent: 3319102 (1967-05-01), Johnson
patent: 4168452 (1979-09-01), Christensen et al.
patent: 4297612 (1981-10-01), Anezaki
patent: 4358703 (1982-11-01), Bijma et al.
patent: 4629933 (1986-12-01), Bijma et al.
patent: 4649317 (1987-03-01), Opresko
patent: 5117153 (1992-05-01), Do

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