Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent
1992-03-16
1994-09-20
Horabik, Michael
Electric lamp and discharge devices
Electrode and shield structures
Filament or resistance heated electrodes
313355, 313311, 313315, H01J 1906
Patent
active
053492650
ABSTRACT:
Structures in electrodes such as filaments for electric lamps and the like are subject to heat corrosion and/or erosion or evaporation during use. The electrodes are coated with synthetic diamond which serves to protect the operating or exposed portion or portions of the electrodes from corrosion and/or erosion. Where the electrode is a filament employed to generate and emit radiation including light energy for illumination, the coating is thin enough to be transmissive of the light energy generated when the electrode is electrically energized. Similarly if the electrode is used in the generation of an arc or electron beam, the synthetic diamond coating serves to protect the core material of the electrode from erosion and/or corrosion while permitting the radiant energy to be transmitted therethrough. If the electrode is a filament in a light bulb, the side wall and end wall thereof heated to incandescense are coated with such protective light transmitting material. In a modified form, the entire electrode is made of carbon.
REFERENCES:
patent: 3604970 (1971-09-01), Campbell et al.
patent: 3826946 (1974-07-01), Hammer et al.
patent: 4084942 (1978-04-01), Villabos
patent: 5132587 (1992-07-01), Lemelson
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