Means for enhancing uniformity in electron beam spot size in tel

Details Means for enhancing uniformity in electron beam spot size in tel Means for enhancing uniformity in electron beam spot size in tel

1980-02-11

1981-11-10

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 67, 358242, 315386, H04N 924, H04N 568, H01J 2952, H01J 2956

Patent

active

043001572

ABSTRACT:
This disclosure depicts means for providing greater spot size uniformity across the screen of cathode ray picture tubes. A beam-current-control signal is derived from the horizontal scansion circuit means in which the amplitude of the signal varies monotonically as a function of the distance of the beam spot from the minor axis of the faceplate. Means for receiving the beam-current-control signal for modulating the luminance signal are provided. The beam-current-control signal has such characteristics that the modulation causes a predetermined gradational reduction in beam current at least from the minor axis to the minor sides of the faceplate to inhibit beam spot enlargement in faceplate side zones and thus provide greater spot size uniformity across the screen.

REFERENCES:
patent: 2613333 (1952-10-01), Bull
patent: 2698400 (1954-12-01), Schreiber
patent: 4196446 (1980-04-01), Rowe et al.

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