(19)
(11) EP 0 438 253 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.09.1991 Bulletin 1991/39

(43) Date of publication A2:
24.07.1991 Bulletin 1991/30

(21) Application number: 91300253.1

(22) Date of filing: 14.01.1991
(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: 16.01.1990 GB 9000962

(71) Applicant: THORN EMI plc
London W1A 2AY (GB)

(72) Inventor:
  • Linden-Smith, Neil Anthony
    Leicester (GB)

(74) Representative: Sanders, Peter Colin Christopher et al
BROOKES & MARTIN High Holborn House 52/54 High Holborn
London WC1V 6SE
London WC1V 6SE (GB)


(56) References cited: : 
   
       


    (54) A discharge tube arrangement


    (57) A discharge tube arrangement comprising a disharge tube (20) containing a fill (24) and a launcher (22) suitable, when energised with radio frequency (r.f.) power, for exciting surface waves in the discharge tube (20). A part of the external surface of the discharge tube is coated with an electrically conductive material (44) to form the inner tube (26) of the launcher (22).






    Search report