Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1985-06-28
1987-04-28
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313146, H01J 2948, H01J 1946
Patent
active
046617418
ABSTRACT:
An electron gun includes a preferably non-metallic apertured grid with a flat upstream-facing surface closely spaced from and parallel to a flat emitting surface of a cathode. The grid aperture diverges in a downstream direction and has its peripheral wall contoured to shape the transverse cross-section of an emitted electron beam at a predetermined downstream location, preferably at the beam crossover. The peripheral wall of the grid aperture is devoid of sharp transitions, has a circular cross section to produce a circular beam crossover of minimum diameter, and has a convex segment extending from the upstream end of the aperture and joining a concave segment extending to the downstream end of the aperture. The convex first segment has a smaller radius of curvature than the second concave segment and has its center of curvature disposed substantially at the upstream facing surface. In the preferred embodiment the grid is made of a synthetic sapphire and the cathode is a thermionic cathode made of lanthanum hexaboride.
REFERENCES:
patent: 3436584 (1969-04-01), Hughes et al.
patent: 4068145 (1978-01-01), Nakagawa et al.
patent: 4258283 (1981-03-01), Brunger et al.
Harte Kenneth J.
Valun John
Control Data Corporation
DeMeo Palmer C.
Edell Ira C.
Helzer Charles W.
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