(19)
(11) EP 0 320 933 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.05.1990 Bulletin 1990/21

(43) Date of publication A2:
21.06.1989 Bulletin 1989/25

(21) Application number: 88120992.8

(22) Date of filing: 15.12.1988
(51) International Patent Classification (IPC)4: H01J 61/82
(84) Designated Contracting States:
BE DE FR GB NL

(30) Priority: 18.12.1987 US 135405

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

(72) Inventors:
  • English, George J.
    North Reading MA 01867 (US)
  • Garrity, Donald F. Jr.
    Chester, NH 03036 (US)
  • Rothwell, Harold L. Jr.
    Georgetown, MA 01833 (US)

(74) Representative: Lemke, Jörg-Michael, Dipl.-Ing. 
Schmiedstrasse 1, Hausen
D-86447 Aindling
D-86447 Aindling (DE)


(56) References cited: : 
   
       


    (54) Pulsed metal halide light source


    (57) The present invention is directed to a new type of colored light source especially well suited for use as a signal and/or navigational aid. The source is also adaptable to many other applications requiring momentary flashes of a particular color of light.
    The mercury-free, pulsed metal halide light source of the present invention comprises in combination:
    (a) a light transmissive glass vacuum outer jacket;
    (b) a light transmissive glass arc tube disposed within said outer jacket;
    (c) emissive material comprising at least one metal halide salt and an inert gas; and
    (d) an anode and a cathode, disposed within said arc tube, forming a gap therebetween;
    said cathode being completely covered by said metal halide salt.







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