(19)
(11) EP 0 405 816 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.07.1991 Bulletin 1991/30

(43) Date of publication A2:
02.01.1991 Bulletin 1991/01

(21) Application number: 90306639.7

(22) Date of filing: 19.06.1990
(51) International Patent Classification (IPC)5: H01J 65/04
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 27.06.1989 GB 8914722

(71) Applicant: THORN EMI plc
London W1R 9AH (GB)

(72) Inventor:
  • Greb, Ulrich
    Cossington, Leicester, LE7 8UT (GB)

(74) Representative: Fleming, Ian Alexander et al
THORN Lighting Limited, The Quadrangle, Westmount Centre, Uxbridge Road
Hayes, Middlesex, UB4 0HB
Hayes, Middlesex, UB4 0HB (GB)


(56) References cited: : 
   
       


    (54) A discharge tube arrangement


    (57) An electrodeless discharge tube (30, 40, 50, 60) containing an ionizable fill is provided for a discharge tube arrangement in which the discharge is generated and sustained using electromagnetic surface waves. The discharge tube comprises a first portion (32, 42, 52, 62) for insertion in a launcher. A further portion (36, 46, 54, 64) of the tube has a dissimilar cross-section from the cross-section of said first portion.







    Search report