Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1980-09-18
1986-07-01
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
313422, H01J 2970, H01J 2972
Patent
active
045982333
ABSTRACT:
A compact color display tube is provided in which a modulated electron beam enters a repelling trajectory control field, formed between a mesh electrode and a planar electrode, at an acute angle .alpha.. The beam follows a parabolic trajectory and approaches a target electrode bearing bands of phosphor stripes at substantially the same angle. The mesh electrode, comprising a plurality of parallel conductors, is disposed adjacent to the target electrode. The conductors of the mesh electrode extend parallel to the stripes and are spaced at a pitch corresponding to the pitch of the repeating bands of phosphor stripes. The target electrode is held at a potential such that the electron beam passing through the space between a pair of the conductors is focused and deflected onto a phosphor line of the target. A colored picture can be produced using a single electron beam by a spot wobbling technique or by scanning each phosphor line sequentially. In the case of a triple beam in-line electron gun, each beam has its own, slightly different trajectory and these trajectories coincide in the apertures of the mesh before impinging on their respective phosphors.
REFERENCES:
patent: 2999957 (1961-09-01), Schagen et al.
patent: 3377500 (1968-04-01), Burns
patent: 3484647 (1969-12-01), McGuinness
patent: 3621319 (1971-11-01), Heynisch
patent: 3683224 (1972-08-01), Lea
patent: 4137486 (1979-01-01), Schwartz
patent: 4153856 (1979-05-01), Siekanowicz et al.
Blum Theodore M.
Kraus Robert J.
U.S. Philips Corporation
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