Quartz glass with reduced ultraviolet radiation transmissivity,

Details Quartz glass with reduced ultraviolet radiation transmissivity, Quartz glass with reduced ultraviolet radiation transmissivity,

1995-05-17

1996-11-05

Tokar, Michael

Electric lamp and discharge devices

With gas or vapor

Envelope composition

501152, 501 64, 501 68, 501153, 313493, C03C 306, H01J 502

Patent

active

055720919

ABSTRACT:
Ultraviolet (UV) radiation in the UV-C and UV-B bands, which is particularly dangerous, is absorbed and filtered by quartz glass doped with between 0.065% and 3.25%, and preferably between 0.065% and 1.3% by weight, of cerium metal, or cerium as such. Preferably, the cerium is added to quartz sand and/or rock crystal, in form of a fine-grained powder of up to 2 0 .mu.m grain size, in form of cerium aluminate (CeAlO.sub.3), present in up to about 5% by weight, and preferably up to about 2%, and melted together in a single step. The quartz glass so obtained is particularly suitable for a metal halide discharge lamp, e.g. as an outer envelope (1), or as the discharge vessel (27) itself, or for halogen incandescent lamps, to form the quartz-glass light bulb or an envelope therefor. A small quantity of titanium oxide, up to about 0.05%, may be added as a further doping agent to the melt to further improve the UV absorption in the B and C bands.

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