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US 5,523,650 AGranted
Electric incandescent lamp with a quartz glass lamp vessel and quartz glass tube for said lamp
AssigneeU.S. Philips Corporation
InventorsJoannes Terheijden, Peter E. M. Van Den Eijn-Den
Life of this patent
Estimating the term…
Abstract
The electric incandescent lamp has a quartz glass lamp vessel (1) or envelope (4') around the lamp vessel, which has a red coloured dope in the area at the side of the incandescent body (3). The quartz glass with red dope contains samarium.sup.II oxide, aluminium oxide and silicon dioxide, the analysis of the glass in its oxidised form being Sm.sub.2 O.sub.3 to 1 to 3% by weight, Al.sub.2 O.sub.3 up to 3% by weight, rest SiO.sub.2, the molar ratio Al/Sm being at least 2.
Claims6
An electric incandescent lamp, comprising:
- a tubular quartz glass lamp vessel having a longitudinal axis, an incandescent body axially arranged in said lamp vessel, said incandescent body being laterally surrounded by quartz glass with a red dope comprising samarium.sup.II oxide, aluminium oxide and silicon dioxide, and upon analysis in oxidized form is found to contain, apart from oxides of trace elements, 1-3% by weight Sm.sub.2 O.sub.3, up to 3% by weight Al.sub.2 O.sub.3, while the remainder is SiO.sub.2, the molar ratio Al/Sm being at least 2.
An electric lamp, comprising:
- a light source;
- and
- a body of red-doped quartz glass surrounding at least a portion of said light-source,
- said red doped quartz glass comprising samarium.sup.II oxide, aluminium oxide and silicon dioxide, said red doped quartz glass containing in oxidized form 1-3% by weight Sm.sub.2 O.sub.3 and up to 3% by weight Al.sub.2 O.sub.3, excluding oxides of trace elements, while the remainder is SiO.sub.2 and the molar ratio Al/Sm is at least 2.
1 more element
An electric lamp, comprising
- a lamp vessel having a portion of red doped quartz glass comprising samarium.sup.II oxide, aluminium oxide and silicon dioxide, said red doped quartz glass containing in oxidized form 1-3% by weight Sm.sub.2 O.sub.3 and up to 3% by weight Al.sub.2 O.sub.3, excluding oxides of trace elements, while the remainder is SiO.sub.2 and the molar ratio Al/Sm being at least 2;
- and
- a light source arranged within said lamp envelope.
Dependencies are inferred from the claim text.