Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device
Patent
1981-01-19
1982-11-30
Bell, Mark
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For plural electrodes of discharge device
501 54, H01J 1716, C03C 306, H01J 6130, H01K 128
Patent
active
043617794
ABSTRACT:
A quartz glass lamp vessel 1 or 21 is used in many types of lamps. Sometimes it is expedient to absorb a certain portion of the emission spectrum. In accordance with the prior art this is possible by including rare earth metal oxides in the quartz glass.
The solubility of rare earth metal oxides in quartz glass is, however, limited.
According to the invention, quartz glass is used which contains an alkali metal oxide and optionally, an alkaline earth metal oxide, in addition to a rare earth metal oxide. The alkali metal oxide increases the solubility of the rare earth metal oxide, so that rare earth metal oxides can be used in larger concentrations. This results in glasses which have a higher degree of absorption, from which lamp vessels can be produced.
REFERENCES:
patent: 3764286 (1973-10-01), Antczak et al.
patent: 3848152 (1974-11-01), Schultz
patent: 3850602 (1974-11-01), Bruning
patent: 3935119 (1976-01-01), Barber et al.
Klimashina E. V. et al., "Effect of Small Additions of Some Elements on the Spectral Properties of Vitreous Silica", Sovj. J. Glass Physics and Chem., 1975, 1 (2), pp. 144-148.
van der Steen Gerardus H. A. M.
Van Hove Eddy F. C.
Bell Mark
Smith Robert S.
U.S. Philips Corporation
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