GB829286A - Improvements in or relating to sodium vapour electric discharge lamps - Google Patents
Improvements in or relating to sodium vapour electric discharge lampsInfo
- Publication number
- GB829286A GB829286A GB1560455A GB1560455A GB829286A GB 829286 A GB829286 A GB 829286A GB 1560455 A GB1560455 A GB 1560455A GB 1560455 A GB1560455 A GB 1560455A GB 829286 A GB829286 A GB 829286A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sleeve
- sleeves
- limbs
- discharge
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
-
- 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
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Glass Compositions (AREA)
Abstract
829,286. Discharge lamps. GENERAL ELECTRIC CO. Ltd. May 17, 1956 [May 31, 1955], No. 15604/55. Addition to 801,482. Class 39(1). [Also in Group XXIII] A sodium vapour-rare gas discharge lamp having a U-shaped envelope sealed into a singlewalled highly evacuated outer jacket and with each limb, of circular or non-circular section, of the envelope closely surrounded by a sleeve of transparent heat-insulating material as described in the parent Specification, has at least one sleeve formed wholly or partly of a material which is highly transparent to the visible radiations of 5890Š and 5896Š wave length emitted by the sodium vapour discharge, but which is such that the proportion of the incident infrared radiations from the discharge which is directly transmitted through the sleeve is appreciably less than the proportion which would be directly transmitted through a sleeve of the same dimensions formed wholly of soda glass having the composition in percentages by weight : SiO 2 -70-0, Al 2 O 3 -2À5 CaO-5À5, MgO- 3À5, Na 2 O-17À0, K 2 O-0À4, B 2 O 3 -0À8, SO 2 -0À2. The or each sleeve can be wholly or partly formed of a phosphate glass having the composition in percentages by weight : P 2 O 5 -67À44, Al 2 O 3 -13À44, CaO-7À12, B 2 O 3 -5À00, SiO 2 -5À00, Fe 2 O 3 -2À00. The phosphate glass manufactured by Chance Bros. Ltd. known as ON20 may also be used. Each sleeve may-consist of a cylinder of glass such as the aforesaid soda or phosphate glass coated on one or each surface with a thin film which is highly transparent to the yellow sodium light but which has a high absorption and/or reflection factor for infra-red radiations. The film may consist of copper, gold,- titanium dioxide or stannic chloride formed by thermal evaporation, sputtering or chemical decomposition. The sleeves may be slid on to the limbs of the U-envelope and held in position by means which restrain the sleeves against relative longitudinal displacement but without the sleeves being attached to the limbs and without the intervention of spacing means ; alternatively the sleeves may be attached to the limbs at one or more regions whose total axial length is small compared with the axial length of the limbs. The sleeves can be used in the specific constructions of lamp described in the parent Specification.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1560455A GB829286A (en) | 1955-05-03 | 1955-05-03 | Improvements in or relating to sodium vapour electric discharge lamps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1560455A GB829286A (en) | 1955-05-03 | 1955-05-03 | Improvements in or relating to sodium vapour electric discharge lamps |
Publications (1)
Publication Number | Publication Date |
---|---|
GB829286A true GB829286A (en) | 1960-03-02 |
Family
ID=10062121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1560455A Expired GB829286A (en) | 1955-05-03 | 1955-05-03 | Improvements in or relating to sodium vapour electric discharge lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB829286A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005002290A1 (en) * | 2003-06-27 | 2005-01-06 | Koninklijke Philips Electronics, N.V. | Control method and apparatus for improving the efficacy of fluorescent lamps |
-
1955
- 1955-05-03 GB GB1560455A patent/GB829286A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005002290A1 (en) * | 2003-06-27 | 2005-01-06 | Koninklijke Philips Electronics, N.V. | Control method and apparatus for improving the efficacy of fluorescent lamps |
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