Cathode ray tube apparatus with reduced beam spot size

Details Cathode ray tube apparatus with reduced beam spot size Cathode ray tube apparatus with reduced beam spot size

1992-08-28

1994-08-30

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313453, 315 15, H01J 2948, H01J 2958

Patent

active

053431138

ABSTRACT:
There is disclosed a cathode-ray tube which employs an electron gun assembly of the laminar flow (LF) type. The beam emanating from the LF electron gun assembly is directed through a three-electrode einzel lens assembly where the center electrode of the einzel lens assembly is subjected to a modulation voltage. Positioned after the einzel lens assembly are magnetic deflection circuits which include a horizontal and vertical coil enabling the beam to deflect in the horizontal and vertical directions and which circuits are positioned internally within the CRT. A convergence assembly is also built within the neck of the CRT. Thus, the CRT provides the advantages of the laminar flow gun while enabling modulation of the electron beam to provide an extremely small spot size to enable the CRT to operate with small spot size and to provide more efficient deflection at higher modulation rates.

REFERENCES:
patent: 3740607 (1973-06-01), Silzars et al.
patent: 3980919 (1976-09-01), Bates et al.
patent: 4429254 (1984-01-01), Chang
patent: 4742266 (1988-05-01), New
Advances in CRT Technology, Watkins-Johnson Company, Tech-notes, vol. 6, No. 2 by Norman Lehrer Mar./Apr., 1979 pp. 1-11.
The Laminar Flow Gun CRT, Watkins-Johnson Company, Tech-notes, vol. 1, No. 3 May/Jun., 1974 pp. 1-10.
An Experimental "In-Neck" integrated Yoke, SID 84 Digest, K. K. N. Chang, RCA Laboratories, 1984, pp. 264-267.
Cathode-Ray Tubes, Radiation Laboratory Series, McGraw-Hill, New York, vol. 22, 1948, p. 47.

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