Lamp having a glass lamp vessel and Glass (Na-Ca-Ba-SiO.sub.2 wi

Details Lamp having a glass lamp vessel and Glass (Na-Ca-Ba-SiO.sub.2 wi Lamp having a glass lamp vessel and Glass (Na-Ca-Ba-SiO.sub.2 wi

1983-09-06

1984-07-10

McCarthy, Helen M.

Electric lamp and discharge devices

With gas or vapor

Envelope composition

313638, 501 65, 501 66, 501 67, 501 70, 501 72, 501 73, 501 77, 501900, C03C 304, C03C 308

Patent

active

044595107

ABSTRACT:
The invention relates to lamps having a glass lamp vessel (1) and to a glass suitable therefor. The relevant glass is adequately resistant to attack by electrons, is resistant to atmospheric influences and is properly workable in a gas flame. This glass contains 44-60 mole % silicon oxide; 0-7.5 mole % boron oxide; 0-6 mole % zirconium oxide; 0-7.5 mole % aluminium oxide; 5-20 mole % calcium oxide; 12.5-25 mole % barium oxide; 0-15 mole % magnesium oxide; 0-10 mole % strontium oxide; 2-8 mole % sodium oxide. The sum of the alkaline earth metals is 25-42.5 mole %.
No discoloration occurs in sodium vapor discharge lamps when the lamp vessel has been made of this glass.

REFERENCES:
patent: 1943051 (1934-01-01), Berger
patent: 3563772 (1971-02-01), Joormann et al.
patent: 4036654 (1977-07-01), Yale
patent: 4122460 (1978-10-01), Humenik et al.
patent: 4179300 (1979-12-01), Sagara
patent: 4265667 (1981-05-01), Ikeda et al.

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