Radiant energy – Irradiation of objects or material
Patent
1995-03-27
1997-07-22
Anderson, Bruce
Radiant energy
Irradiation of objects or material
313636, H01J 1716, H01J 3700
Patent
active
056506309
ABSTRACT:
To eliminate radiation from the mercury high-pressure discharge lamp of wlengths below 365 nm, the lamp includes a discharge vessel of quartz glass which is doped with vanadium in a quantity of up to about only 250 ppm, by weight, with respect to 1 mm of wall thickness of the quartz glass. This absorbed radiation also heats the quartz glass, so that the outside wall temperature of the vessel can be maintained between about 400.degree. and 950.degree. C. The effect can be enhanced by adding, additionally, titanium and/or tin to provide metal ions to the doping substance, in an overall quantity of up to 500 ppm, by weight. Alternatively, the quartz glass can be coated with TiO.sub.2 or SnO.sub.2. Suitable wall thicknesses for the discharge vessel are between 1 and 5 mm, and the fill therein is preferably mercury in a quantity of between 0.5 and 15 mg/cm.sup.3 and xenon with a cold fill pressure of 0.1 to 2.5 bar. Electrode spacing of the lamp is preferably between 2 and 5 mm. The vanadium portion preferably is less than 200 ppm and may, most desirably, be between 20 and 150 ppm, with respect to 1 mm wall thickness of the quartz glass of the discharge vessel.
REFERENCES:
patent: Re30165 (1979-12-01), Mason et al.
patent: 2862131 (1958-11-01), Escher-Desrivieres
patent: 3253174 (1966-05-01), Elmer et al.
patent: 3902091 (1975-08-01), Mason et al.
patent: 4732842 (1988-03-01), Kira
patent: 4985275 (1991-01-01), Takemura et al.
Dierks Joern
Maier Juergen
Anderson Bruce
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
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