GB947311A - Improvements in or relating to sodium-vapour-resistant glass tubing and to electric lamps incorporating such tubing - Google Patents
Improvements in or relating to sodium-vapour-resistant glass tubing and to electric lamps incorporating such tubingInfo
- Publication number
- GB947311A GB947311A GB345660A GB345660A GB947311A GB 947311 A GB947311 A GB 947311A GB 345660 A GB345660 A GB 345660A GB 345660 A GB345660 A GB 345660A GB 947311 A GB947311 A GB 947311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium
- tubing
- thick
- layer
- resistant glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
A composite glass tube, which can form the envelope-preferably U-shaped-of a sodium vapour discharge lamp, consists of an outer layer of support glass, an intermediate layer of non-darkening sodium resistant glass, and an inner layer of darkening sodium resistant glass, the outer layer being thicker than the combined thickness of the intermediate and inner layers, preferably ten or more times as thick. Preferably, the intermediate layer is thicker than the inner layer, e.g. two or three times as thick. In a specific example the outside diameter of the glass tube was 17 mms. and the average wall thickness was 1.0 mm., the intermediate layer being 0.029 mm. thick and the inner layer being 0.013 mm. thick. The support glass consists of, in weight percentages, SiO2-72.0, Al2O3-1.5, CaO-5.2, MgO-3.1, Na2O-17.5, K2O-0.2, B2O3-0.5. The intermediate layer consists of SiO2-0.6, B2O3-22.1, Al2O3-24.4, CaO-7.0, BaO-44.8, SrO-0.2, Na2O-0.2, K2O-1.4. The inner layer consists of SiO2-8.2, Al2O3-26.5, CaO-7.2, Na2O-12.9, B2O3-45.2. The thermal expansions of the glasses are closely matched. The composite tubing is made by the usual process of blowing and drawing by hand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB345660A GB947311A (en) | 1960-02-01 | 1960-02-01 | Improvements in or relating to sodium-vapour-resistant glass tubing and to electric lamps incorporating such tubing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB345660A GB947311A (en) | 1960-02-01 | 1960-02-01 | Improvements in or relating to sodium-vapour-resistant glass tubing and to electric lamps incorporating such tubing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB947311A true GB947311A (en) | 1964-01-22 |
Family
ID=9758671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB345660A Expired GB947311A (en) | 1960-02-01 | 1960-02-01 | Improvements in or relating to sodium-vapour-resistant glass tubing and to electric lamps incorporating such tubing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB947311A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3350598A (en) * | 1965-12-29 | 1967-10-31 | Sylvania Electric Prod | High pressure electric discharge device containing a fill of mercury, halogen and an alkali metal and barrier refractory oxide layers |
| US3377498A (en) * | 1966-01-03 | 1968-04-09 | Sylvania Electric Prod | In a high pressure lamp, protective metal oxide layers on the inner wall of the quartz envelope |
| US4209726A (en) * | 1977-11-02 | 1980-06-24 | U.S. Philips Corporation | Low-pressure sodium vapor discharge lamp |
| EP1391914A2 (en) * | 2002-08-22 | 2004-02-25 | Osram-Sylvania Inc. | Discharge lamp |
| EP1403905A3 (en) * | 2002-09-30 | 2006-06-14 | Osram Sylvania, Inc. | Snap-on spring clip for ceramic HID lamp |
| US7372207B2 (en) | 2003-05-16 | 2008-05-13 | Koninklijke Philips Electronics, N.V. | Lamp and method of manufacturing a lamp |
-
1960
- 1960-02-01 GB GB345660A patent/GB947311A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3350598A (en) * | 1965-12-29 | 1967-10-31 | Sylvania Electric Prod | High pressure electric discharge device containing a fill of mercury, halogen and an alkali metal and barrier refractory oxide layers |
| US3377498A (en) * | 1966-01-03 | 1968-04-09 | Sylvania Electric Prod | In a high pressure lamp, protective metal oxide layers on the inner wall of the quartz envelope |
| US4209726A (en) * | 1977-11-02 | 1980-06-24 | U.S. Philips Corporation | Low-pressure sodium vapor discharge lamp |
| EP1391914A2 (en) * | 2002-08-22 | 2004-02-25 | Osram-Sylvania Inc. | Discharge lamp |
| EP1391914A3 (en) * | 2002-08-22 | 2006-06-14 | Osram-Sylvania Inc. | Discharge lamp |
| EP1403905A3 (en) * | 2002-09-30 | 2006-06-14 | Osram Sylvania, Inc. | Snap-on spring clip for ceramic HID lamp |
| US7372207B2 (en) | 2003-05-16 | 2008-05-13 | Koninklijke Philips Electronics, N.V. | Lamp and method of manufacturing a lamp |
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