Diamond electron radiation cathode, electron source,...

Details Diamond electron radiation cathode, electron source,... Diamond electron radiation cathode, electron source,...

2011-03-01

2011-03-01

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

Discharge devices having a multipointed or serrated edge...

C313S310000, C313S311000, C313S341000, C313S336000

Reexamination Certificate

active

07898161

ABSTRACT:
An object is to provide an electron emitting cathode achieving high luminance, low energy dispersion, and long life. It is therefore an object to provide a diamond electron emitting cathode graspable on a sufficiently stable basis, sharpened at the tip, and improved in electric field intensity. A diamond electron emitting cathode110according to the present invention is partitioned into at least three regions, i.e., a front end region203intended for electron emission at a tip of columnar shape, a rear end region201intended for grasping opposite in the longitudinal direction, and a thinned intermediate region202, a cross-sectional area of the rear end region is not less than 0.2 mm2, the tip of the front end region is sharpened, and a maximum cross-sectional area of the thinned intermediate region is not more than 0.1 mm2.

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