EP0123397B1 - Lampe à vapeur de sodium à haute pression non saturée - Google Patents

Lampe à vapeur de sodium à haute pression non saturée Download PDF

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Publication number
EP0123397B1
EP0123397B1 EP84301612A EP84301612A EP0123397B1 EP 0123397 B1 EP0123397 B1 EP 0123397B1 EP 84301612 A EP84301612 A EP 84301612A EP 84301612 A EP84301612 A EP 84301612A EP 0123397 B1 EP0123397 B1 EP 0123397B1
Authority
EP
European Patent Office
Prior art keywords
getter
sodium
high pressure
arc tube
lamp
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
Application number
EP84301612A
Other languages
German (de)
English (en)
Other versions
EP0123397A1 (fr
Inventor
Philip J. White
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GTE Products Corp filed Critical GTE Products Corp
Publication of EP0123397A1 publication Critical patent/EP0123397A1/fr
Application granted granted Critical
Publication of EP0123397B1 publication Critical patent/EP0123397B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/825—High-pressure sodium lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/26—Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope

Definitions

  • This invention relates to high pressure sodium lamps of the unsaturated vapor pressure type and more particularly to an unsaturated vapor pressure type high pressure sodium lamp having an arc tube containing a fill gas and a getter in contact with the fill gas.
  • High pressure sodium lamps and particularly so-called saturated high pressure sodium lamps, are known in the art, see US-A-3,384,798.
  • a lamp comprises an evacuated glass envelope having a plurality of electrically conductive support members therein and extending therethrough, an elongated arc tube having a pair of electrodes extending therethrough and affixed to said electrically conductive support members within said glass envelope and a gas fill including mercury and sodium within said elongated arc tube.
  • a lamp wherein the amount of sodium and mercury employed is only that which would become totally vaporised in use, i.e. an unsaturated vapor type lamp, would be a highly desirable structure insofar as efficiency, cost of manufacture and enhanced lighting capability are concerned, although no practical embodiment of such a lamp was known until the disclosure of US-A 4,075,530 of Furukubo et al.
  • a niobium exhaust pipe is coupled to an arc tube and a decomposable material, NaN3, is located within the exhaust pipe.
  • the exhaust pipe is heated to decompose the NaN3 while the arc tube is cooled to effect condensation.
  • the material within this exhaust pipe is heated to effect decomposition, transferred to the arc tube wherein materials, such as sodium and mercury, are condensed and whereat undesired gases, such as nitrogen, are withdrawn.
  • an object of the invention is to provide a practically usable unsaturated high pressure sodium lamp that is capable of manufacture by more economic means.
  • the invention accordingly provides a lamp of the kind initially referred to which is characterised in that said mercury and sodium are provided only in an amount that will become completely vaporised in use and that said lamp further comprises a getter located within said arc tube in direct contact with said fill gas and providing a metal oxide having a free energy of formation per mole of oxygen more negative than the free energy of formation per mole of oxygen of sodium oxide.
  • Fig. 1 illustrates an unsaturated vapor pressure high pressure sodium lamp of the invention.
  • a glass envelope 3 is formed for insertion in a normal screw-type metal base 5.
  • a stem portion 7 of glass is hermetically sealed to the glass envelope 3 and extends therein.
  • the stem portion 7 has a plurality of electrical conductors 9 sealed therein and extending therethrough.
  • An electrically conductive support member 11 is affixed to one of the electrical conductors 9 and to a metal crossmember 13 attached to an electrode 15 at one end of an elongated arc tube 17.
  • Another electrode 19 is located at the opposite end of the arc tube 17 and attached to one of the electrical conductors 9 passing through the stem portion 7.
  • Heat insulating sleeves 21 and 23 are wrapped about the opposite ends of the arc tube 17 in the vicinity of the electrodes 19 and 15 respectively.
  • the glass envelope is evacuated and at least one getter, preferably barium, 25 is Positioned adjacent the stem portion 7.
  • a lamp fill including sodium and mercury is disposed within the arc tube 17 in an amount only sufficient to provide an unsaturated vapor type high pressure sodium lamp.
  • a getter forming a metal oxide having a free energy of formation per mole of oxygen more negative than sodium oxide and more positive than aluminum oxide is located within the arc tube 17. The getter is in direct contact with the fill gas and preferably adjacent one of the electrodes 15 and 19 within the arc tube 17.
  • the getter is of a material which does not react with mercury or sodium but does react with oxygen at a rate greater than the rate of reaction of sodium with oxygen. Also, the getter has a melting temperature greater than the operational end temperature of the arc tube 17. Moreover, a preferred getter is a zirconium-aluminum alloy getter manufactured by SAES Getters S.P.A., Milan, Italy, and known by the trade name St 101 getter having an alloy containing about 84% zirconium and 16% aluminum.
  • each of the lamps included an arc tube 17 of a polycrystalline aluminum oxide material having an inner volume of about 4.3 cubic centimeters.
  • Each of the arc tubes 17 contained a relatively low amount of sodium, about 6 X 10- 5 g, and one of the arc tubes 17 included about 10 mg of the above-described zirconium-aluminum getter material.
  • a high pressure sodium lamp employing an unsaturated vapor pressure
  • a getter is positioned within the arc tube of the lamp.
  • the arc tube has a relatively low amount of sodium introduced therein, and the getter forms a metal oxide with a more negative free energy of formation than that of sodium oxide.
  • the sodium level of the arc tube is maintained and the period of operational use of the lamp is extended as compared with prior known structures.

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  • Discharge Lamp (AREA)

Claims (7)

1. Lampe au sodium à haute pression comprenant une ampoule (3) de verre sous vide contenant une pluralité de supports électriquement conducteurs (9, 11, 13) dans laquelle ils font saillie, un tube à arc (17) de forme allongée et comportant deux électrodes (15,19) s'étendant au travers et fixées aux dits supports électriquement conducteurs (9,13) à l'intérieur de la dite ampoule de verre et un gaz de remplissage incluant du mercure et du sodium à l'intérieur du dit tube à arc (17), caractérisée en ce que la quantité du dit mercure et du dit sodium est juste telle qu'elle soit complètement vaporisée en fonctionnement de manière à déterminer une lampe du type à pression de vapeur non saturée, et que la dite lampe comprend en outre un getter disposé à l'intérieur du dit tube à arc (17) en contact direct avec le dit gaz de remplissage et fournissant un oxyde de métal présentant une énergie libre de formation par mole d'oxygène plus négative que cells de l'oxyde de sodium.
2. Lampe au sodium à haute pression non saturée selon la revendication 1 caractérisée en ce que le dit getter est réalisé dans un alliage zirconium-aluminium.
3. Lampe au sodium à haute pression non saturée selon la revendication 1 ou 2 caractérisée en ce que le dit getter ne réagit ni au mercure ni au sodium.
4. Lampe au sodium à haute pression non saturée selon l'une quelconque des revendications 1 à 3 caractérisée en ce que le dit getter est réalisé dans un alliage contenant 84% environ de zirconium et 16% environ d'aluminium.
5. Lampe au sodium à haute pression non saturée selon l'une quelconque des revendications 1 à 4 caractérisée en ce que le dit tube à arc a une température donnée d'extrémité en fonctionnement, et que la température du point de fusion du dit getter est supérieure à la dite température donnée d'extrémité en fonctionnement du dit tube à arc.
6. Lampe au sodium à haute pression non saturée selon l'une quelconque des revendications 1 à 5 caractérisé en ce que le matériau du dit getter réagit avec l'oxygène plus rapidement que le sodium avec l'oxygène.
7. Lampe au sodium à haute pression non saturée selon l'une quelconque des revendications 1 à 7 caractérisé en ce que le dit tube à arc a un volume de 4,3 cm3 environ et contient 6.10-5 g environ de sodium et 10 mg environ d'ùn getter comprenant 84% de zirconium et 16% d'aluminium.
EP84301612A 1983-03-10 1984-03-09 Lampe à vapeur de sodium à haute pression non saturée Expired EP0123397B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47389583A 1983-03-10 1983-03-10
US473895 1990-08-27

Publications (2)

Publication Number Publication Date
EP0123397A1 EP0123397A1 (fr) 1984-10-31
EP0123397B1 true EP0123397B1 (fr) 1988-12-28

Family

ID=23881464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301612A Expired EP0123397B1 (fr) 1983-03-10 1984-03-09 Lampe à vapeur de sodium à haute pression non saturée

Country Status (5)

Country Link
EP (1) EP0123397B1 (fr)
JP (1) JPS59169050A (fr)
AU (1) AU578603B2 (fr)
CA (1) CA1222273A (fr)
DE (1) DE3475855D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282657A1 (fr) * 1987-03-16 1988-09-21 Iwasaki Electric Co., Ltd. Lampe à vapeur de sodium à haute pression ayant des caractéristiques d'un type à pression de vapeur non saturée
JP2928813B2 (ja) * 1988-02-10 1999-08-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 不飽和高圧ナトリウムランプ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203901A (en) * 1962-02-15 1965-08-31 Porta Paolo Della Method of manufacturing zirconiumaluminum alloy getters
US3384798A (en) * 1966-04-26 1968-05-21 Gen Electric High pressure saturation vapor sodium lamp containing mercury
US3485343A (en) * 1967-08-28 1969-12-23 Gen Electric Oxygen getter for high pressure sodium vapor lamp
DE2131887B2 (fr) * 1970-06-24 1974-09-19 Shing Cheung Kowloon Hong Kong Chow (Grossbritannien)
US4075530A (en) * 1976-04-21 1978-02-21 Japan Storage Battery Company Limited High pressure sodium vapor lamp of unsaturated vapor pressure type

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3453477A (en) * 1967-02-16 1969-07-01 Gen Electric Alumina-ceramic sodium vapor lamp
GB1211176A (en) * 1967-02-16 1970-11-04 Gen Electric High-pressure sodium vapor lamp
US3805105A (en) * 1971-06-30 1974-04-16 Gte Sylvania Inc High pressure electric discharge device with zirconium-aluminum getter
US4025812A (en) * 1975-10-14 1977-05-24 General Electric Company Alumina ceramic alkali metal lamp having metal getter structure
HU172230B (hu) * 1976-04-07 1978-07-28 Egyesuelt Izzolampa Razrjadnyj istochnik sveta vysokogo davlenija s metallo-galogennoj dobavkoj
CA1214196A (fr) * 1983-02-14 1986-11-18 Jack M. Strok Tubes couleur a vapeur de sodium haute pression avec desoxygeneur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203901A (en) * 1962-02-15 1965-08-31 Porta Paolo Della Method of manufacturing zirconiumaluminum alloy getters
US3384798A (en) * 1966-04-26 1968-05-21 Gen Electric High pressure saturation vapor sodium lamp containing mercury
US3485343A (en) * 1967-08-28 1969-12-23 Gen Electric Oxygen getter for high pressure sodium vapor lamp
DE2131887B2 (fr) * 1970-06-24 1974-09-19 Shing Cheung Kowloon Hong Kong Chow (Grossbritannien)
US4075530A (en) * 1976-04-21 1978-02-21 Japan Storage Battery Company Limited High pressure sodium vapor lamp of unsaturated vapor pressure type

Also Published As

Publication number Publication date
EP0123397A1 (fr) 1984-10-31
AU2547884A (en) 1984-09-13
CA1222273A (fr) 1987-05-26
JPS59169050A (ja) 1984-09-22
DE3475855D1 (en) 1989-02-02
AU578603B2 (en) 1988-11-03

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