(19)
(11) EP 0 341 749 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.03.1991 Bulletin 1991/13

(43) Date of publication A2:
15.11.1989 Bulletin 1989/46

(21) Application number: 89108640.7

(22) Date of filing: 12.05.1989
(51) International Patent Classification (IPC)4: H01J 61/36, H01J 9/32
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 13.05.1988 US 194060

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

(72) Inventors:
  • Snellgrove, Richard A.
    Danvers, MA 01923 (US)
  • Wyner, Elliot F.
    Peabody, MA 01960 (US)

(74) Representative: Butler, Michael John 
FRANK B. DEHN & CO. Imperial House 15-19 Kingsway
London, WC2B 6UZ
London, WC2B 6UZ (GB)


(56) References cited: : 
   
       


    (54) Improved arc tube for high pressure metal vapor discharge lamp, lamp including same, and method


    (57) An arc tube for a high pressure metal vapor discharge lamp is provided. The arc tube of the present invention comprises a tubular ceramic envelope; a chemical fill within said envelope; a seal button at each end of said envelope; said seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through said seal button aperture and being oriented such that the electrode projects into said tubular ceramic envelope, said feedthrough member being sealed into said seal button by means of a fritless seal between said seal button and said feedthrough; and sealing frit material sealing said seal buttons into the ends of said tubular ceramic envelope. A method for fabricating the above-described arc tube and high pressure metal vapor discharge lamp including the above-described arc tube is also provided.







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