Back to results
US 4,792,728 AGranted
Cathodoluminescent garnet lamp
AssigneeInternational Business Machines Corporation
InventorsIfay F. Chang, Ronald I. Feigenblatt, Webster E. Howard, Eugene I. Gordon
Life of this patent
Estimating the term…
Abstract
A cathodoluminescent lamp in the form of a vacuum diode or triode uses a self-supporting YAG crystal as the light emitter. The crystal shape can be selected (spherical, slab, bar) for desired effect and light trapping is turned to advantage by selectively coating the crystal surface to provide for preferential light emission.
Claims16
An intense light source comprising a coating means to inhibit light transmission from regions of said crystal:
- an evacuated chamber formed by one or more walls,
- a self-supporting garnet crystal in said evacuated chamber,
- a relatively massive heat sink in heat conducting relation to said crystal,
- excitation means located in said chamber for exciting said garnet crystal simultaneously over a substantial portion of a surface of said crystal, with electromagnetic radiation from many directions, and
- a light transmitting region in at least one wall of said chamber for transmitting light emitted by said garnet crystal.
2 more elements
Dependencies are inferred from the claim text.