GB1471454A - Low pressure mercury vapour discharge lamp with amalgam - Google Patents
Low pressure mercury vapour discharge lamp with amalgamInfo
- Publication number
- GB1471454A GB1471454A GB3303674A GB3303674A GB1471454A GB 1471454 A GB1471454 A GB 1471454A GB 3303674 A GB3303674 A GB 3303674A GB 3303674 A GB3303674 A GB 3303674A GB 1471454 A GB1471454 A GB 1471454A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mol
- amalgam
- lamp
- lamps
- metal
- 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
- 229910000497 Amalgam Inorganic materials 0.000 title abstract 8
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title abstract 2
- 229910052753 mercury Inorganic materials 0.000 title abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 229910000846 In alloy Inorganic materials 0.000 abstract 1
- 229910052783 alkali metal Inorganic materials 0.000 abstract 1
- 150000001340 alkali metals Chemical class 0.000 abstract 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 1
- 150000001342 alkaline earth metals Chemical class 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910052793 cadmium Inorganic materials 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 229910052738 indium Inorganic materials 0.000 abstract 1
- 229910052745 lead Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
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
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
1471454 Metal-vapour lamps PATENT TREUHAND GES FUR ELEKTRISCHE GLUHLAMPEN mbH 26 July 1974 [1 Aug 1973] 33036/74 Heading H1D In a low pressure mercury vapour discharge lamp, preferably a fluorescent lamp, an amalgam determining the equilibrium vapour pressure in operation of the lamp and containing more than one metal (apart from Hg) contains an alkali metal or an alkaline earth metal (e.g. Mg). The amalgam may also include In, Pb, Cd, Su. The proportion of In may be 5-50 mol per cent, preferably 5-40 mol per cent, with 5-40 mol per cent Hg. A particular amalgam for lamps which are thermally highly loaded contains 1 mol Hg, 6 mol In and 1 mol Mg. For high power lamps, the amalgam may contain 1 mol Hg, 10 mol In and 1 mol Hg. Mg can be substituted for In reducing the amount of In by about 40%, which reduces cost and has other advantages. As shown in Fig. 1, a lamp with an envelope 1 carrying a fluorescent layer 2 has at each end a stem 3 carrying the electrodes and having a flare 4. The amalgam is applied to flare 4 in the form of a ring 10. The width of ring 10 may be 3 mm., and quantity of Mg, 1À2 mg and of In, 34 mg. 20 mg Of Hg is introduced into the lamp. The amalgam formed contains 1 mol Hg to 7 mol of Mg-In alloy. A metal cylinder 11 surrounding the electrode carries an amalgam-forming alloy 13 including In to facilitate run-up. Alternatively, the amalgam (15) of composition Hg 1 In 10 Mg 1 , is carried by an iron foil (14) (Fig. 2, not shown) disposed around the stem and supported thereby by means of a wire. The lamps have a light flux which varies little with changes in the internal temperature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2339056A DE2339056A1 (en) | 1973-08-01 | 1973-08-01 | LOW PRESSURE MERCURY VAPOR DISCHARGE LAMP WITH AMALGAM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1471454A true GB1471454A (en) | 1977-04-27 |
Family
ID=5888618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3303674A Expired GB1471454A (en) | 1973-08-01 | 1974-07-26 | Low pressure mercury vapour discharge lamp with amalgam |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3906284A (en) |
| DE (1) | DE2339056A1 (en) |
| GB (1) | GB1471454A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070570A (en) * | 1976-06-29 | 1978-01-24 | General Energy Development Corporation | Lighting apparatus |
| DE2820746C3 (en) * | 1978-05-12 | 1980-11-06 | Kernforschungsanlage Juelich Gmbh, 5170 Juelich | Mercury vapor low pressure discharge lamp |
| GB2182486B (en) * | 1985-10-04 | 1990-06-06 | Ushio Electric Inc | Magnesium and iron vapor discharge lamp |
| CN1146010C (en) * | 1997-03-27 | 2004-04-14 | 皇家菲利浦电子有限公司 | Low-pressure mercury discharge lamp |
| US6310437B1 (en) | 2000-06-01 | 2001-10-30 | General Electric Company | Fluorescent lamp extension tube amalgam holder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3263111A (en) * | 1962-08-02 | 1966-07-26 | Ulrich W Doering | Fluorescent tube with mercury amalgam on tube wall |
| DE1937938C3 (en) * | 1969-07-25 | 1980-10-09 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen | Mercury vapor low pressure discharge lamp with major and minor amalgam |
-
1973
- 1973-08-01 DE DE2339056A patent/DE2339056A1/en not_active Withdrawn
-
1974
- 1974-07-23 US US490986A patent/US3906284A/en not_active Expired - Lifetime
- 1974-07-26 GB GB3303674A patent/GB1471454A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3906284A (en) | 1975-09-16 |
| DE2339056A1 (en) | 1975-02-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |