Hot cathode for broad beam electron gun

Details Hot cathode for broad beam electron gun Hot cathode for broad beam electron gun

1981-05-20

1985-02-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural ray-type tube

313302, 313446, H01J 2950, H01J 3100

Patent

active

044994052

ABSTRACT:
An improved broad beam electron gun having a hot cathode assembly which is comprised of cathode means for generating a substantially hemispherical space-charge distribution, the cathode means including electron emitting structures having principal electron emissive surfaces which lie in hypothetical cylindrical-shaped surfaces, the axes of revolution of which are coincident with the major axis of symmetry of the electron emitting structure, the major axis of symmetry being orthogonal to the plane of the anode, the electron emitting structures variously including concave filament sections which form a tip, cylinders and coils, and wherein an electron beam of broad, uniform cross-sectional area is obtained without a shaping grid.

REFERENCES:
patent: 1949048 (1934-02-01), Holst
patent: 2148588 (1939-02-01), Snow
patent: 3374386 (1968-03-01), Charbonnier et al.
patent: 3626231 (1971-12-01), Kahl
patent: 3863163 (1975-01-01), Farrell et al.

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