C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/13, 313/173
C03C 3/06 (2006.01) H01J 61/30 (2006.01) H01K 1/28 (2006.01)
Patent
CA 1143384
PHN 9663 10 29.8.80 ABSTRACT: Lamp having a lamp vessel made of quartz glass, quartz glass and method of preparing quartz glass. 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 us- ed 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 ab- sorption, from which lamp vessels can be produced. Fig. 6 to be included.
368585
Van Der Steen Gerardus H.a.m.
Van Hove Eddy F.c.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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