Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1980-11-24
1983-02-01
Anderson, Bruce C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313426, 313432, 313460, H01J 2950
Patent
active
043718086
ABSTRACT:
The electron beam emanated by a single electron gun falls, after traversing two successive quadrupolar electron lenses, on a beam separator electrode having a pair of vertically spaced apertures formed therethrough for permitting the passage of fractions of the incident beam as two separate beams for dual image display. Subsequently deflected vertically by respective pairs of vertical deflection plates, the two display beams follow their trajectories to a target screen through a focus corrector device, a third quadrupolar electron lens, a pair of horizontal deflection plates, and a dome-shaped scan expansion mesh. Were it not for the focus corrector device, the spots of the display beams on the screen would differ in size according to whether they were deflected upwardly or downwardly by the vertical deflection plate pairs disposed respectively above and below the tube axis. Comprising four plates arranged in boxlike configuration with insulating gaps therebetween, the focus corrector device functions to compensate for spot size variations in the vertical direction.
REFERENCES:
patent: 3497744 (1970-02-01), Himmelbauer et al.
patent: 3639796 (1972-02-01), Fuse
patent: 3792303 (1974-02-01), Albertin et al.
patent: 3819984 (1974-06-01), Hawken
patent: 3949262 (1976-04-01), Ohkoshi et al.
patent: 4137479 (1979-01-01), Janko
patent: 4302704 (1981-11-01), Saito
Kaneko Isamu
Urano Tadao
Anderson Bruce C.
Iwatsu Electric Co. Ltd.
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