EP0119082B1 - Hochdrucknatriumlampe mit ungesättigtem Dampf und Getter - Google Patents

Hochdrucknatriumlampe mit ungesättigtem Dampf und Getter Download PDF

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Publication number
EP0119082B1
EP0119082B1 EP84301610A EP84301610A EP0119082B1 EP 0119082 B1 EP0119082 B1 EP 0119082B1 EP 84301610 A EP84301610 A EP 84301610A EP 84301610 A EP84301610 A EP 84301610A EP 0119082 B1 EP0119082 B1 EP 0119082B1
Authority
EP
European Patent Office
Prior art keywords
arc tube
oxygen
sodium
envelope
getter
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
EP84301610A
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English (en)
French (fr)
Other versions
EP0119082A2 (de
EP0119082A3 (en
Inventor
Philip J White
Robert S. White
John A. Scholz
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 EP0119082A2 publication Critical patent/EP0119082A2/de
Publication of EP0119082A3 publication Critical patent/EP0119082A3/en
Application granted granted Critical
Publication of EP0119082B1 publication Critical patent/EP0119082B1/de
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
    • H01J61/02—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 unsaturated vapor high pressure sodium lamps and more particularly to the mounting of getters within the arc tube of an unsaturated vapor high pressure sodium lamp.
  • High pressure sodium vapor discharge lamps comprising a getter are also known from US-A-3 485 313 and US-A-3 953 755.
  • the above-described technique has been employed with varying amounts of success, it has been found that the results do leave something to be desired. More specifically, it has been found that intimate contact between the tubular ceramic envelope of the arc tube and the oxygen-absorbing getter therein tends to cause an undesired darkening of the ceramic envelope in the area of contact with the getter material. Although the exact cause of this darkening condition of the ceramic envelope is not thoroughly understood, it is believed that a chemical reduction takes place between the getter and the aluminium envelope whereat contact therebetween is effected.
  • An object of the present invention is to provide an improved high pressure sodium lamp. Another object of the invention is to enhance the arc tube of an unsaturated vapor high pressure sodium lamp. A further object of the invention is the structure of an unsaturated vapor high pressure sodium lamp.
  • an arc tube having a tubular ceramic envelope with an electrode sealed into each end of the envelope, a dosing of sodium, mercury and rare gas within the envelope and an oxygen-absorbing getter attached to at least one of the electrodes within the ceramic envelope.
  • Fig. 1 illustrates an unsaturated vapor high pressure sodium lamp 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.
  • 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.
  • This arc tube preferably of a material such as polycrystalline alumina for example, includes an electrode 29 and 31 at either end thereof.
  • 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 the arc tube 27 at each end thereof in the vicinity of the electrodes 29 and 31 in order to reduce the heat differential thereat from the center of the arc tube 27.
  • a getter 37 is disposed within the arc tube 27 of Fig. 1
  • an electrode member 39 is sealed into an apertured ceramic 41 which is, in turn, sealed into the end of a tubular ceramic envelope of an arc tube.
  • the opposite end of the tubular ceramic envelope is sealed in substantially the same manner.
  • the electrode member 39 includes a shank portion 43 which has a substantially circularly- wound cathode portion 45 telescoped thereover and affixed thereto, as by welding for example. Also affixed to the shank portion 43 intermediate the cathode portion 45 and the apertured ceramic 41 is the getter 37.
  • the getter 37 is in the form of a suitable substrate 47, such as nickel plated iron, and a gettering material 49, such as zirconium- aluminum powder, is sintered thereto. Thereafter, the substrate 47 is affixed to or telescoped over the shank portion 43 of the electrode member 39.
  • a preferred gettering material is a zirconium-aluminum alloy known as ST-101, available from SAES Getters, Milan, Italy, other metals are equally applicable.
  • metal alloys selected from the metal group consisting of aluminum, titanium, scandium, cerium, lanthanum, thorium, zirconium, yttrium and other rare earth oxides are suitable gettering materials for the above-described configurations.
  • a small tab containing a gettering material could be affixed to the electrode or alternatively, the getter material could be applied to the wound cathode portion 45 of the electrode member 39.
  • other configurations of a similar nature are appropriate to the structure so long as the gettering material is separated from the ceramic envelope of the arc tube.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Discharge Lamp (AREA)

Claims (9)

1. Bogenentladungsröhre für eine Hochdruck-Natriumlampe, welche umfaßt:
eine rohrförmige keramische Hülle (27);
eine Dosis an Natrium, Quecksilber and Edelgas in der keramischen Hülle; und
jeweils eine Elektrode (29, 31), die in jedes Ende der keramischen Hülle eingesiegelt bzw. eingeschmolzen ist, dadurch gekennzeichnet, daß die Dosierung von Natrium und Quecksilber lediglich ausreicht, damit des Natrium und das Quecksilber im Betrieb vollständig verdampft werden, um eine Lampe vom Typ mit ungesättigtem Dampf zu schaffen, und daß ein sauerstoffabsorbierender Getter (37) innerhalb der keramischen Hülle angeordnet und an zumindest einer der Elektroden befestigt ist, wobei der Getter von der Bogenentladungsstrecke zwischen den Elektroden entfernt sich in unmittelbarem Kontakt mit der Dosierung befindet.
2. Bogenentladungsröhre nach Anspruch 1, dadurch gekennzeichnet, daß der sauerstoffabsorbierende Getter (37) innerhalb der und in Abstand von der rohrförmigen keramischen Hülle (27) positioniert ist.
3. Bogenentladungsröhre nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der sauerstoffabsorbierende Getter (37) an einem Substrat (47) befestigt ist, das seinerseits an einem Schaftteil (43) einer der Elektroden (45) innerhalb der rohrförmigen keramischen Hülle (27) befestigt ist.
4. Bogenentladungsröhre nach Anspruch 3, dadurch gekennzeichnet, daß der sauerstoffabsorbierende Getter (37) in der Form eines Metallpulvers (49) vorliegt, das an das Substrat (47) gesintert ist.
5. Bogenentladungsröhre nach Anspruch 4, dadurch gekennzeichnet, daß das Substrat in der Form einer geschlitzten, eine Durchbrechung aufweisenden Scheibe vorliegt, die um den Schaftteil montiert ist und sich radial von diesem erstreckt.
6. Bogenentladungsröhre nach einem Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der sauerstoffabsorbierende Getter aus Aluminium, Titan, Scandium, Hafnium, Zer, Lanthan, Thorium, Yttrium oder Zirkonium besteht.
7. Bogenentladungsröhre nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Natrium und das Quecksilber der Dosierung innerhalb der rohrförmigen Hülle (27) in der Form eines Amalgams vorliegen, das innerhalb der Lampe zerfällt, um das Quecksilber und das Natrium und Sauerstoff zur Verfügung zu stellen, der von dem sauerstoffabsorbierenden Getter absorbiert wird.
8. Bogenentladungsröhre nach einem Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die rohrförmige keramische Hülle (27) in der Form einer rohrförmigen polykristallinen Aluminiumhülle vorliegt.
9. Hochdruck-Natriumlampe der ungesättigen Art mit einer Bogenentladungsröhre nach einem der Ansprüche 1 bis 8.
EP84301610A 1983-03-10 1984-03-09 Hochdrucknatriumlampe mit ungesättigtem Dampf und Getter Expired EP0119082B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47389783A 1983-03-10 1983-03-10
US473897 1983-03-10

Publications (3)

Publication Number Publication Date
EP0119082A2 EP0119082A2 (de) 1984-09-19
EP0119082A3 EP0119082A3 (en) 1985-06-19
EP0119082B1 true EP0119082B1 (de) 1988-12-28

Family

ID=23881474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301610A Expired EP0119082B1 (de) 1983-03-10 1984-03-09 Hochdrucknatriumlampe mit ungesättigtem Dampf und Getter

Country Status (5)

Country Link
EP (1) EP0119082B1 (de)
JP (1) JPS59169051A (de)
AU (1) AU578602B2 (de)
CA (1) CA1222274A (de)
DE (1) DE3475853D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8623296D0 (en) * 1986-09-27 1986-10-29 Emi Plc Thorn Hydrogen getter
US5434472A (en) * 1992-04-15 1995-07-18 United States Philips Corporation High-pressure sodium discharge lamp with getter
DE4325679A1 (de) * 1993-07-30 1995-02-02 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische Lampe mit Halogenfüllung
US20070096649A1 (en) * 2005-10-28 2007-05-03 Roels Timothy J Electrode-mounted getter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485343A (en) * 1967-08-28 1969-12-23 Gen Electric Oxygen getter for high pressure sodium vapor lamp
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1211176A (en) * 1967-02-16 1970-11-04 Gen Electric High-pressure sodium vapor lamp
US3453477A (en) * 1967-02-16 1969-07-01 Gen Electric Alumina-ceramic sodium vapor lamp
NL7315641A (nl) * 1973-11-15 1975-05-20 Philips Nv Hogedrukgasontladingslamp.
NL7611137A (nl) * 1976-10-08 1978-04-11 Philips Nv Hogedrukontladingslamp.
CA1214196A (en) * 1983-02-14 1986-11-18 Jack M. Strok Color rendition high pressure sodium arc tubes having an oxygen getter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485343A (en) * 1967-08-28 1969-12-23 Gen Electric Oxygen getter for high pressure sodium vapor lamp
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
JPS59169051A (ja) 1984-09-22
AU2547784A (en) 1984-09-13
CA1222274A (en) 1987-05-26
AU578602B2 (en) 1988-11-03
EP0119082A2 (de) 1984-09-19
EP0119082A3 (en) 1985-06-19
DE3475853D1 (en) 1989-02-02

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