EP0623946B1 - Niederdruck Natrium Entladungslampe - Google Patents

Niederdruck Natrium Entladungslampe Download PDF

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Publication number
EP0623946B1
EP0623946B1 EP19940201152 EP94201152A EP0623946B1 EP 0623946 B1 EP0623946 B1 EP 0623946B1 EP 19940201152 EP19940201152 EP 19940201152 EP 94201152 A EP94201152 A EP 94201152A EP 0623946 B1 EP0623946 B1 EP 0623946B1
Authority
EP
European Patent Office
Prior art keywords
coating
discharge vessel
pinched seal
extends
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 - Lifetime
Application number
EP19940201152
Other languages
English (en)
French (fr)
Other versions
EP0623946A1 (de
Inventor
Karel Roger Vervecken
Petrus Martinus Gerardus Van Gennip
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
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP19940201152 priority Critical patent/EP0623946B1/de
Publication of EP0623946A1 publication Critical patent/EP0623946A1/de
Application granted granted Critical
Publication of EP0623946B1 publication Critical patent/EP0623946B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/366—Seals for leading-in conductors
    • H01J61/368—Pinched seals or analogous seals

Definitions

  • the invention relates to a low-pressure sodium discharge lamp comprising:
  • Such a low-pressure sodium discharge lamp is known from US-A-4,783,612.
  • the coatings have a butt joint which lies inside the relevant pinched seal.
  • the first coating is resistant to sodium. This coating protects the current conductors against electric contact with liquid or solid sodium which could deposit against the pinched seal. The discharge arc could apply itself to the sodium if the coating were absent, which would lead to violent reactions and damage to the current conductor and the pinched seal.
  • the second coating is thicker than the first one and absorbs forces which result from the difference between the coefficients of thermal expansion of the discharge vessel and the current conductors.
  • this object is achieved in that the first coating extends through the entire pinched seal and is enveloped by the second coating in the pinched seal.
  • the low-pressure sodium discharge lamp has a discharge vessel 1 which is sealed in a vacuumtight miner and contains a filling comprising sodium and rare gas.
  • Electrodes 2 are arranged in the discharge vessel, each connected to at least one respective current conductor 3 which issues to the exterior through a respective pinched seal 4.
  • each electrode has two current conductors.
  • the current conductors 3 each have a first coating 5 of borate glass which extends from the relevant pinched seal 4 to inside the discharge vessel 1, and in contact with the said coating 5 a second coating 6 of lime glass which extends to outside the discharge vessel.
  • An evacutated outer bulb 8 provided with an IR reflection filter 7 surrounds the discharge vessel and carries a lamp cap, for example, a bayonet cap 10.
  • the first coating 5 extends through the entire pinched seal 4 and is enveloped by the second coating 6 in the pinched seal.
  • Table 1 (1),(6) (5) (1') SiO 2 63.3 5.6 5.7 B 2 O 3 0.8 17.2 18.5 Al 2 O 3 4.7 8.8 9.2 Na 2 O 17.1 K 2 O 0.7 0.16 MgO 3.1 5.1 5.0 CaO 4.7 10.3 10.0 BaO 5.2 50.4 50.4 SrO 0.9 1.1 ZrO 2 1.5 SO 3 0.07 remainder 0.33 0.04 0.1 (1') borate glass on discharge vessel
  • each electrode 2 has two current conductors 3, for example made of CrNiFe, each with an individual first 5 and individual second coating 6.
  • the discharge vessel 1 is made of lime glass and has a layer of borate glass at its inner surface in order to make the discharge vessel resistant to sodium.
  • the outer bulb has an IR reflection filter, for example of tin-doped indium oxide, at its innner surface.
  • the lamp in the drawing has a first coating of borate glass which extends throughout the relevant pinched seal from inside the discharge vessel. It is favourable for the coating to extend to outside the discharge vessel so as to have manufacturing tolerances available.
  • the second coating of lime glass may be made, for example, of the same glass as the discharge vessel. The presence of this coating is nevertheless visible, inter alia because it projects from the pinched seal.
  • the lamp of the type shown continued to burn after 9000 hours at a 125 kHz high-frequency supply without cracks becoming observable.
  • lamps with cracks were found after 2000 hours already upon operation under identical circumstances.
  • One fourth of the number of lamps exhibited cracks after 5000 hours.
  • the compositions of the glasses used are given in % by weight in Table 1.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (1)

  1. Niederdruck-Natriumentladungslampe mit:
    einem gasdicht verschlossenen Entladungsgefäß (1) mit einer Natrium und Edelgas enthaltenden Füllung ;
    in dem Entladungsgefäß angeordneten Elektroden (2), die jeweils mit zumindest einem jeweiligen Stromleiter (3) verbunden sind, der durch eine jeweilige Quetschdichtung (4) nach außen tritt, wobei die Stromleiter (3) jeweils einen ersten Überzug (5) aus Boratglas haben, der sich von der betreffenden Quetschdichtung (4) in das Entladungsgefäß (1) hinein erstreckt, und im Kontakt mit diesem Überzug (5) einen zweiten Überzug (6) aus Kalkglas, der sich bis außerhalb des Entladungsgefäßes erstreckt;
    einem evakuierten, mit einem IR-Reflexionsfilter (7) versehenen Außenkolben (8), der das Entladungsgefäß umgibt,
       dadurch gekennzeichnet, daß der erste Überzug (5) durch die gesamte Quetschdichtung (4) hindurch verläuft und in der Quetschdichtung von dem zweiten Überzug (6) umgeben wird.
EP19940201152 1993-05-03 1994-04-27 Niederdruck Natrium Entladungslampe Expired - Lifetime EP0623946B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19940201152 EP0623946B1 (de) 1993-05-03 1994-04-27 Niederdruck Natrium Entladungslampe

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93201256 1993-05-03
EP93201256 1993-05-03
EP19940201152 EP0623946B1 (de) 1993-05-03 1994-04-27 Niederdruck Natrium Entladungslampe

Publications (2)

Publication Number Publication Date
EP0623946A1 EP0623946A1 (de) 1994-11-09
EP0623946B1 true EP0623946B1 (de) 1997-01-15

Family

ID=26133782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940201152 Expired - Lifetime EP0623946B1 (de) 1993-05-03 1994-04-27 Niederdruck Natrium Entladungslampe

Country Status (1)

Country Link
EP (1) EP0623946B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3665510B2 (ja) * 1999-06-28 2005-06-29 株式会社小糸製作所 放電ランプ装置用アークチューブ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8302128A (nl) * 1983-06-15 1985-01-02 Philips Nv Lagedruknatriumdampontladingslamp.

Also Published As

Publication number Publication date
EP0623946A1 (de) 1994-11-09

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