Protective metal silicate coating for electrodeless HID lamps

Details Protective metal silicate coating for electrodeless HID lamps Protective metal silicate coating for electrodeless HID lamps

1996-11-25

1999-02-02

Patel, Vip

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313489, 313637, 313640, H01J 1716

Patent

active

058669833

ABSTRACT:
Sodium loss, free halide build-up, devitrification and wall etching of the arc chamber are substantially reduced in an electrodeless HID metal halide arc discharge lamp by a protective metal silicate coating present only on the interior, equatorial portion of the arc chamber wall which is closest to the arc plasma. Suitable coatings include a metal silicate of a metal selected from the group consisting essentially of scandium, yttrium, beryllium, rare earth metal and mixture thereof.

REFERENCES:
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patent: 2030397 (1936-02-01), Reynolds
patent: 2568459 (1951-09-01), Noel
patent: 3984590 (1976-10-01), Mason et al.
patent: 4047067 (1977-09-01), Clausen
patent: 4256988 (1981-03-01), Coaton et al.
patent: 4918352 (1990-04-01), Hess et al.
patent: 5032762 (1991-07-01), Spacil et al.
patent: 5270615 (1993-12-01), Chang

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