Patent ID: 8749127

Claim:
A cathodoluminescent device comprising: a transparent envelope; a reflective, conductive, metal anode layer deposited over a phosphor layer deposited on an interior of a face of the envelope; a thermionic, broad-beam, electron gun attached to feedthroughs penetrating a glass disk, the glass disk fused to a base of the envelope, the electron gun comprising a cathode, a metal guard ring, a metal extraction ring, a metal field-forming ring, and a diffusing grid, and wherein the cathode further comprises a heater; a two point snubber making contact to the anode layer, the snubber coupled to a feedthrough of the glass disk; and a power supply mounted to the feedthroughs of the glass disk, the power supply having circuitry for providing power to the heater of the cathode and for providing an acceleration voltage between the electron gun and the anode, the power supply having a connector for coupling the device to receive power from a fixture.