Color display system with electrostatic convergence means

Details Color display system with electrostatic convergence means Color display system with electrostatic convergence means

1986-06-26

1987-09-29

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 313414, 313439, H01J 2951, H01J 2962

Patent

active

046971203

ABSTRACT:
A color display system includes a cathode-ray tube and yoke. The yoke is a non-converging type. The cathode-ray tube has en electron gun assembly for generating and directing three electron beams, located at the corners of an equilateral triangle, along paths toward a screen of the tube. The electron gun assembly comprises three electron guns each including electrodes that comprise a beam-forming region and electrodes that form a main focusing lens in the path of each electron beam. The main focusing lens is formed by at least two focusing electrodes. The focusing electrode closest to the beam-forming region includes a separated part adjacent to the paths of each of the electron beams. Each separated part forms a portion of the dipole lens structure in the path of an electron beam. Means are provided for applying dynamic signals to the separated parts which are related to the deflection of the electron beams. The dipole lens structures establish electrostatic dipole fields in the path of the three electron beams that cause the beams to converge at the screen for all angles of deflection.

REFERENCES:
patent: 2907915 (1959-10-01), Gleichauf
patent: 3317769 (1967-05-01), Johnson
patent: 3590302 (1971-06-01), Bussey
patent: 3614502 (1971-10-01), Doggett et al.
patent: 3778666 (1973-12-01), Miyaoka et al.
patent: 3916244 (1975-10-01), Evans, Jr.
patent: 4291251 (1981-09-01), Bijma et al.
patent: 4470029 (1984-09-01), Chase

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