High emissivity cold cathode ultrastructure

Details High emissivity cold cathode ultrastructure High emissivity cold cathode ultrastructure

1988-09-26

1990-04-10

DeMeo, Palmer C.

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313346R, 313353, H01J 130

Patent

active

049163566

ABSTRACT:
A high emissivity cold cathode has alternating cylindrical tube layers, deposited by vapor deposition, of a refractory metal such as niobium and a refractory insulating material such as alumina. The metal layers have a thickness of less than or about 1,000 angstroms such that the electric field strength at the exposed end is sufficient, in combination with a low work function metal to emit electrons when a voltage of about 2,000 volts is applied.

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