EP0122051B1 - Procédé pour doser une lampe à vapeur de sodium à haute pression non-saturée - Google Patents

Procédé pour doser une lampe à vapeur de sodium à haute pression non-saturée Download PDF

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Publication number
EP0122051B1
EP0122051B1 EP19840301613 EP84301613A EP0122051B1 EP 0122051 B1 EP0122051 B1 EP 0122051B1 EP 19840301613 EP19840301613 EP 19840301613 EP 84301613 A EP84301613 A EP 84301613A EP 0122051 B1 EP0122051 B1 EP 0122051B1
Authority
EP
European Patent Office
Prior art keywords
sodium
arc tube
oxygen
mercury
high 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
Application number
EP19840301613
Other languages
German (de)
English (en)
Other versions
EP0122051A1 (fr
Inventor
Philip J. White
Dennis B. Shinn
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
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Filing date
Publication date
Application filed by GTE Products Corp filed Critical GTE Products Corp
Publication of EP0122051A1 publication Critical patent/EP0122051A1/fr
Application granted granted Critical
Publication of EP0122051B1 publication Critical patent/EP0122051B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels

Definitions

  • This invention relates to a process for dosing the sodium amount in the arc tube of a high pressure sodium lamp of the unsaturated vapor pressure type.
  • Concurrently filed related European Patent Applications No. 84301612.2 entitled “Unsaturated Vapor Pressure Type High Pressure Sodium Lamps”, and No. 84301610.6 entitled “Unsaturated Vapor High Pressure Sodium Lamp Getter Mounting”, relate to an arc tube and an arc tube fabricating process for unsaturated vapor high pressure sodium lamps.
  • concurrently filed related European Patent No. 84301611.4 entitled “Unsaturated Vapor High Pressure Sodium Lamp Arc Tube Fabrication Process” and No. 84301615.5 entitled “Arc Tube Fabrication Process” relate to arc tube fabrication of unsaturated vapor high pressure sodium lamps.
  • a process for dosing an arc tube for a high pressure sodium lamp of the unsaturated vapour pressure type with the proper amount of sodium and mercury in accordance with the prior art portion of claim 1 is known (U.S. Patent 4,156,550, issued to Farukubo et al. on May 29, 1979).
  • sodium azide (NaN3) was dissolved in a solvent, placed in a container and the solvent evaporated.
  • a mercury dispenser in the form of an AI-ZrTi-Hg alloy was placed in the container. Thereafter, the container was positioned within one exhaust pipe affixed to the arc tube, and this one exhaust pipe was closed or pinched off. Another exhaust pipe or tube was affixed to the other end of the arc tube and to an exhaust system. The exhaust tube having the container therein was heated to decompose the sodium and mercury-containing compounds and provide the desired sodium and mercury within the arc tube. Also, the arc tube was evacuated and re-filled with a starting gas.
  • An object of the present invention is to provide an enhanced unsaturated vapour high pressure sodium lamp. Another object of the invention is to improve the dosing of an arc tube for an unsaturated vapor high pressure sodium lamp. Still another object of the invention is to provide an improved process for dosing the arc tube of an unsaturated vapor high pressure sodium lamp. A further object of the invention is to enhance the manufacture of unsaturated vapor high pressure sodium lamps.
  • Fig. 1 illustrates a high pressure sodium lamp of the unsaturated vapor pressure type having a hermetically sealed and evacuated glass envelope 5 formed to fit into an ordinary screw-type base member 7.
  • a glass stem member 9 is sealed to the envelope 5 and projects therein. Electrical conductors, 11 and 13 respectively, are sealed into and pass through the stem member 9 to provide electrical connections from the interior to the exterior of the glass envelope 5.
  • An electrically conductive support member 15 is affixed to one of the electrical conductors 11 and has a pair of crossbars 17 and 19 affixed thereto at either end. Also, a plurality of springlike members 21 are affixed to the support member 15 and formed for contact with the glass envelope 5. Moreover, a pair of getters 23 and 25 are attached to the support member 15 and serve to insure the integrity of the evacuated envelope 5.
  • This arc tube 27 Disposed within the glass envelope 5 and supported by the crossbars 17 and 19 is an arc tube 27.
  • One electrode 29 is affixed to and supported by the crossbar 17 while the other electrode 31 is insulatingly supported by the other crossbar 19, but electrically connected to the electrical conductor 13 passing through the stem member 9.
  • Heat conserving elements 33 may be wrapped about arc tube 27 at each end thereof in the vicinity of the electrodes 19 and 31 in order to reduce the heat differential thereat from the center of the arc tube 27.
  • a sodium-containing compound such as sodium aluminate having a decomposition temperature greater than about 600°C is located within the arc tube 27.
  • the sodium-containing compound is positioned in the general vicinity of one of the electrodes 31.
  • an oxygen-absorbing getter of an alloy from the group of metals including aluminum, titanium, scandium, hafnium, cerium, zirconium, lanthanum, thorium, yttriumm and other rare earth or actinide metals is positioned within the arc tube 27 in the vicinity of arc of the electrodes 31.
  • one end of the arc tube 27 is sealed and the sodium-containing compound and oxygen-absorbing getter are in pellet form and merely poured into the other end of the arc tube 27.
  • the arc tube 27 is flushed with an inert gas, such as nitrogen, and filled with a rare gas, such as xenon and mercury.
  • an inert gas such as nitrogen
  • a rare gas such as xenon and mercury.
  • the mercury may be included in a mercury-containing compound which is located within the arc tube 27 in the manner previously described with respect to the sodium-containing compound and oxygen-absorbing getter.
  • decomposition of a mercury-containing compound within the arc tube 27 is also appropriate to the dosing of the arc tube 27.
  • the sealing of the unsealed end of the arc tube 27 is effected, and the desired decomposition therein takes place during operational use. More specifically, the sodium-containing compound decomposes to provide oxygen and sodium and the oxygen-absorbing getter serves to absorb the oxygen to prevent reformation of the original sodium-containing compound. As a result, the desired dose of sodium, mercury and rare gas is provided within the arc tube 27,
  • a graph is shown illustrating the atomic sodium content vs. time within an arc tube 27 which is dosed with mercury, xenon and sodium aluminate but which does not include an oxygen-absorbing getter within the arc tube 27.
  • a zirconium-aluminum getter is included within the arc tube 27 of the embodiment used to measure the graph of Fig. 3.
  • the atomic sodium content in the arc tube of the embodiment of Fig. 2 without the oxygen-absorbing getter rapidly decreases with operational time.
  • the zirconium-aluminum getter in the arc tube of the embodiment of Fig. 3 inhibits sodium-compound reformation whereupon the sodium content of the arc tube 27 remains substantially constant for an extended period of time.
  • a high pressure sodium lamp of the unsaturated vapor pressure type is provided by a process having numerous advantages over other known techniques.
  • the process is inexpensive of process operations and component cost, but exhibits an efficiency of fabrication and dosing of an arc tube believed to be previously unattainable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Claims (5)

1. Procédé pour le dosage de la quantité de sodium dans le tube à arc d'une lampe au sodium à haute pression du type à pression de vapeur non saturée, caractérisé en ce qu'il comporte les étapes suivantes:
introduction dans le dit tube à arc d'un composé contenant du sodium et de l'oxygène, d'un getter absorbant l'oxygène, d'un composé décomposable contenant du du mercure, et d'un gaz rare; et
scellement du dit tube à arc, de manière à obtenir la décomposition thermique du dit composé contenant de l'oxygène et du sodium à l'intérieur du dit tube à arc lors du fonctionnement de la lampe, le dit getter absorbant l'oxygène de manière à rendre libre d'éviter larefor- mation du dit composé contenant du sodium et de l'oxygène.
2. Procédé selon la revendication 1 caractérisé en ce que le dit composé contenant du sodium est un aluminate de sodium.
3. Procédé selon la revendication 1 caractérisé en ce que le getter absorbant l'oxygène est un alliage de métaux choisis dans le groupe comprenant l'aluminium, le titane, le scandium, le cérium, l'hafnium, le lanthane, l'yttrium, le thorium et le zirconium.
4. Procédé selon la revendication 1 caractérisé en ce que le dit mercure est présent sous forme d'un composé contenant du mercure se décomposant pour délivrer du mercure.
5. Procédé selon la revendication 1 caractérisé en ce que le composé contenant du sodium est de l'aluminate de sodium et que le dit getter absorbant l'oxygène est un alliage de métal au titane.
EP19840301613 1983-03-10 1984-03-09 Procédé pour doser une lampe à vapeur de sodium à haute pression non-saturée Expired EP0122051B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47389283A 1983-03-10 1983-03-10
US473892 1983-03-10

Publications (2)

Publication Number Publication Date
EP0122051A1 EP0122051A1 (fr) 1984-10-17
EP0122051B1 true EP0122051B1 (fr) 1987-06-10

Family

ID=23881451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840301613 Expired EP0122051B1 (fr) 1983-03-10 1984-03-09 Procédé pour doser une lampe à vapeur de sodium à haute pression non-saturée

Country Status (5)

Country Link
EP (1) EP0122051B1 (fr)
JP (1) JPS59194328A (fr)
AU (1) AU578237B2 (fr)
CA (1) CA1239980A (fr)
DE (1) DE3464177D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037721C2 (de) * 1990-11-27 2003-02-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zur Herstellung einer Natriumhochdrucklampe sowie dafür geeignete Vorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH455038A (it) * 1965-06-08 1968-04-30 Getters Spa Procedimento per riempire con del mercurio dei recipienti a scarica e per eliminare i gas residui nocivi
US3453477A (en) * 1967-02-16 1969-07-01 Gen Electric Alumina-ceramic sodium vapor lamp
IT963874B (it) * 1972-08-10 1974-01-21 Getters Spa Dispositivo getter perfezionato contenente materiale non evapora bile
US4075530A (en) * 1976-04-21 1978-02-21 Japan Storage Battery Company Limited High pressure sodium vapor lamp of unsaturated vapor pressure type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037721C2 (de) * 1990-11-27 2003-02-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zur Herstellung einer Natriumhochdrucklampe sowie dafür geeignete Vorrichtung

Also Published As

Publication number Publication date
AU2547084A (en) 1984-09-13
DE3464177D1 (en) 1987-07-16
CA1239980A (fr) 1988-08-02
JPS59194328A (ja) 1984-11-05
EP0122051A1 (fr) 1984-10-17
AU578237B2 (en) 1988-10-20

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