Metal halide lamp with titania-silicate barrier zone in fused si

Details Metal halide lamp with titania-silicate barrier zone in fused si Metal halide lamp with titania-silicate barrier zone in fused si

1974-06-13

1976-10-26

Demeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313221, 313227, H01J 6122, H01J 6135

Patent

active

039886280

ABSTRACT:
A titania-silicate glass zone or layer is formed at the surface in fused silica by first applying a thick opaque polycrystalline titania powder coating to the silica and then fusing the coating into the silica at a high temperature. Such a zone reduces the ultraviolet transmission of the silica and also lowers its sodium ion conductivity. The zone may usefully be formed on the fused silica arc tubes of metal halide lamps in order to inhibit sodium loss and on other discharge lamps required to be ozone free.

REFERENCES:
patent: 2568459 (1951-09-01), Noel
patent: 3531677 (1970-09-01), Loughridge

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