GB1176955A - Improvements in or relating to Low Pressure Mercury Vapour Fluorescent Electric Discharge Lamps and their Manufacture - Google Patents
Improvements in or relating to Low Pressure Mercury Vapour Fluorescent Electric Discharge Lamps and their ManufactureInfo
- Publication number
- GB1176955A GB1176955A GB3269067A GB3269067A GB1176955A GB 1176955 A GB1176955 A GB 1176955A GB 3269067 A GB3269067 A GB 3269067A GB 3269067 A GB3269067 A GB 3269067A GB 1176955 A GB1176955 A GB 1176955A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gram atom
- coating
- envelope
- mercury
- pressure
- 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
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
1,176,955. Luminescent materials. GENERAL ELECTRIC & ENGLISH ELECTRIC COMPANIES Ltd. 17 July, 1968 [17 July, 1967], No. 32690/67. Heading C4S. [Also in Division H1] In a L.P.M.V. fluorescent discharge lamp containing a rare starting gas at a pressure of a few mm. Hg, and designed in normal operation to develop a minimum wall temperature exceeding 55‹ C., the coating on the internal surface of the envelope includes dispersed in association with the fluorescent material, one or more of the metals Cu, Ag, Au, Zn, Al, Tl, Sn, Pb, Bi, Fe, Co, Ni, in the form of a finely divided powder and in a total amount exceeding 0À3 gram atom per gram atom of the total mercury contained in the envelope. The metal forms an amalgam during processing or initial operation of the lamp to reduce the mercury vapour pressure in operation. The high wall temperature may result either from a power loading exceeding 0À4 watt per sq. inch of the internal surface of the envelope or from operation in conditions of high ambient temperature e.g. in an enclosed fitting. The powder may be uniformly dispersed in the fluorescent material or as a separate layer between the fluorescent material and the envelope. The preferred metals are Sn and Pb which do not oxidize during baking, in particle sizes of 10-50 Á. The coating operation is as described in Specification 1,176,954. A lamp is described having a filling of mercury and argon at a pressure of 2À5 mm. Hg and a coating of a halophosphate phosphor containing Sn powder in an amount of 1À69 gram atoms of Sn per gram atom of Hg. A higher power lamp has a filling of mercury and a mixture of 80% neon and 20% argon at a pressure of 2 mm. Hg and a coating of halophosphate phosphor containing 0À54 gram atom of powdered Sn per gram atom of Hg.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3269067A GB1176955A (en) | 1967-07-17 | 1967-07-17 | Improvements in or relating to Low Pressure Mercury Vapour Fluorescent Electric Discharge Lamps and their Manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3269067A GB1176955A (en) | 1967-07-17 | 1967-07-17 | Improvements in or relating to Low Pressure Mercury Vapour Fluorescent Electric Discharge Lamps and their Manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1176955A true GB1176955A (en) | 1970-01-07 |
Family
ID=10342552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3269067A Expired GB1176955A (en) | 1967-07-17 | 1967-07-17 | Improvements in or relating to Low Pressure Mercury Vapour Fluorescent Electric Discharge Lamps and their Manufacture |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1176955A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2343329A1 (en) * | 1976-03-04 | 1977-09-30 | Philips Nv | LOW PRESSURE MERCURY VAPOR DISCHARGE LAMP |
WO1997013000A1 (en) * | 1995-10-05 | 1997-04-10 | General Electric Company | Amalgam for use in fluorescent lamps comprising lead, tin, mercury together with another of the group silver, magnesium, copper, nickel, gold and platinum |
WO2001071770A1 (en) * | 2000-03-21 | 2001-09-27 | Koninklijke Philips Electronics N.V. | Low-pressure mercury-vapor discharge lamp and amalgam |
-
1967
- 1967-07-17 GB GB3269067A patent/GB1176955A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2343329A1 (en) * | 1976-03-04 | 1977-09-30 | Philips Nv | LOW PRESSURE MERCURY VAPOR DISCHARGE LAMP |
WO1997013000A1 (en) * | 1995-10-05 | 1997-04-10 | General Electric Company | Amalgam for use in fluorescent lamps comprising lead, tin, mercury together with another of the group silver, magnesium, copper, nickel, gold and platinum |
US5952780A (en) * | 1995-10-05 | 1999-09-14 | General Electric Company | Amalgam for use in fluorescent lamps comprising lead, tin, mercury together with another of the group silver, magnesium, copper, nickel, gold and platinum. |
WO2001071770A1 (en) * | 2000-03-21 | 2001-09-27 | Koninklijke Philips Electronics N.V. | Low-pressure mercury-vapor discharge lamp and amalgam |
US6734616B2 (en) * | 2000-03-21 | 2004-05-11 | Koninklijke Philips Electronics N.V. | Low-pressure mercury-vapor discharge lamp and amalgam |
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