(19)
(11) EP 0 271 877 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.07.1990 Bulletin 1990/27

(43) Date of publication A2:
22.06.1988 Bulletin 1988/25

(21) Application number: 87118580.7

(22) Date of filing: 15.12.1987
(51) International Patent Classification (IPC)4: H01J 61/36, H01J 61/02, H01J 61/18, H01J 61/22
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 15.12.1986 US 941442

(71) Applicant: GTE PRODUCTS CORPORATION
Wilmington Delaware 19801 (US)

(72) Inventors:
  • Passmore, Edmund M.
    Gloucester Massachusetts 01950 (US)
  • Duggan, George L.
    Bedford Massachusetts 01750 (US)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Improved in-lead for sodium and metal-halide lamps


    (57) In an arc tube (40) of a high-pressure discharge lamp, there is provided an inlead member (46) disposed in an end aperture (44) of the arc tube. A coiled wire (60) is disposed about the inlead member forming a gasket between the inlead member and the arc tube at the arc tube end aperture. A sealing glass (56) is provided for sealing between the inlead member and the arc tube end wall. The sealing glass is blocked by the coiled wire so that the sealing glass is not exposed to the constituents within the arc tube, whereby deleterious chemical reactions between the contituents of the arc tube fill and the sealing glass are avoided. In some embodiments, the coil wire also protects the inlead from chemical attack by the fill constituents.







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