EP0136750A1 - Lampe électrique sans culot - Google Patents

Lampe électrique sans culot Download PDF

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Publication number
EP0136750A1
EP0136750A1 EP84201239A EP84201239A EP0136750A1 EP 0136750 A1 EP0136750 A1 EP 0136750A1 EP 84201239 A EP84201239 A EP 84201239A EP 84201239 A EP84201239 A EP 84201239A EP 0136750 A1 EP0136750 A1 EP 0136750A1
Authority
EP
European Patent Office
Prior art keywords
lamp
external current
niobium
lamp vessel
tantalum
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.)
Ceased
Application number
EP84201239A
Other languages
German (de)
English (en)
Inventor
Jaak Maria Jozef INT. OCTROOIBUREAU B.V. Geboers
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0136750A1 publication Critical patent/EP0136750A1/fr
Ceased 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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/46—Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/40—Leading-in conductors

Definitions

  • the invention relates to a copless electric lamp provided with a lamp vessel of quartz glass which is sealed in a vacuum-tight manner and in which an electric element is arranged, metal foils being incorporated in the wall of the lamp vessel, to each of which foils are welded a respective internal current conductor connected to the electric element and a respective external current conductor which serves to make direct electrical contact with a lamp holder.
  • a lamp is known, from US-PS 4,015,165 (PHX.7884).
  • Such external current conductors conventionally consist of molybdenum.
  • This metal has the disadvantage that it is susceptible to corrosion, as a result of which the lamp is in poor electrical contact with the connection terminals of the lamp holder. This results in electrical losses and may even lead to the lamp being not capable of operating.
  • the external current conductors consist of molybdenum wires which are incorporated in tubes of, for example, nickel. Thus, a good electrical contact with a lamp holder is ensured.
  • a disadvantage of the known construction is that the cost of the lamp is considerably higher due to the fact that additional component parts are used.
  • the invention has for its object to provide an electric lamp having external current conductors which are sufficiently resistant to corrosion and which nevertheless have a non-composite structure.
  • this object is achieved in the lamp described in the opening paragraph in that the external current conductors consist of niobium or tantalum.
  • the electric element in the lamp according to the invention may be a pair of electrodes in an ionizable gas or may be a filament, for example in a halogen-containing gas.
  • the lamp vessel of quartz glass the term "quartz glass” being understood to mean glass having an Si0 2 content of at least 95% by weight, has a very small thermal coefficient of expansion. Therefore, the current conductors generally consist of molybdenum or tungsten where they are embedded in the wall of the lamp vessel in a vacuum-tight manner and are in the form of a foil. As compared with other metals, the said metals have a low coefficient of expansion. It is necessary to use foil-shaped conductors in order to ensure that the conductors are embedded in a vacuum-tight manner. Niobium and tantalum in the form of a foil do not ensure a vacuum-tight embedding in quartz glass. In the lamp according to the invention, the external current conductors of niobium or tantalum are therefore welded to the foils.
  • the foils can be incorporated each in a respective seal of the lamp vessel or together in one seal of the lamp vessel.
  • the external conductors of the lamp according to the invention had a high resistance to corrosion.
  • the lamp with niobium external conductors is to be preferred if a high power lamp is concerned because niobium is a better heat conductor than tantalum.
  • the external current conductors may contain the impurities usual for niobium and tantalum, respectively.
  • Molybdenum foils 3 are embedded in the wall 2 of the quartz glass lamp vessel 1 in a vacuum-tight manner. Inside the lamp vessel a filament 4 is arranged as the electric element with internal current conductors 5 connected to the foil 3. Each of the foils 3 has welded to it an external current conductor 6 of tantalum or niobium.
  • the lamp vessel is filled with a mixture of inert gas and hydrobromide and consumes at 12 V a power of 100 W.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP84201239A 1983-09-01 1984-08-28 Lampe électrique sans culot Ceased EP0136750A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8303045 1983-09-01
NL8303045 1983-09-01

Publications (1)

Publication Number Publication Date
EP0136750A1 true EP0136750A1 (fr) 1985-04-10

Family

ID=19842333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201239A Ceased EP0136750A1 (fr) 1983-09-01 1984-08-28 Lampe électrique sans culot

Country Status (2)

Country Link
EP (1) EP0136750A1 (fr)
HU (1) HU187998B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB808933A (en) * 1956-10-09 1959-02-11 Gen Electric Co Ltd Improvements in or relating to vitreous-to-metal pinch seals
US3668391A (en) * 1970-08-19 1972-06-06 Sylvania Electric Prod Tungsten halogen lamp having improved seal of molybdenum aluminide
US4015165A (en) * 1975-02-04 1977-03-29 U.S. Philips Corporation Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB808933A (en) * 1956-10-09 1959-02-11 Gen Electric Co Ltd Improvements in or relating to vitreous-to-metal pinch seals
US3668391A (en) * 1970-08-19 1972-06-06 Sylvania Electric Prod Tungsten halogen lamp having improved seal of molybdenum aluminide
US4015165A (en) * 1975-02-04 1977-03-29 U.S. Philips Corporation Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves

Also Published As

Publication number Publication date
HUT35421A (en) 1985-06-28
HU187998B (en) 1986-03-28

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB NL

17P Request for examination filed

Effective date: 19851004

17Q First examination report despatched

Effective date: 19870326

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19880204

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GEBOERS, JAAK MARIA JOZEFINT. OCTROOIBUREAU B.V.