(19)
(11) EP 0 491 471 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.09.1992 Bulletin 1992/40

(43) Date of publication A2:
24.06.1992 Bulletin 1992/26

(21) Application number: 91310751.2

(22) Date of filing: 21.11.1991
(51) International Patent Classification (IPC)5: H01J 35/16, H01J 35/04
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.11.1990 US 616464

(71) Applicant: VARIAN ASSOCIATES, INC.
Palo Alto, California 94304 (US)

(72) Inventors:
  • Richardson, John E.
    Salt Lake City, Utah 84121 (US)
  • Boye, James E.
    Salt Lake City, Utah 84103 (US)
  • Koller, Thomas J.
    Salt Lake City, Utah 84121 (US)

(74) Representative: Cline, Roger Ledlie et al
EDWARD EVANS & CO. Chancery House 53-64 Chancery Lane
London WC2A 1SD
London WC2A 1SD (GB)


(56) References cited: : 
   
       


    (54) High power x-ray tube


    (57) A high power x-ray generating tube (2) for reducing the effects of excessive heating of the window (16) through which the x-rays (16) are transmitted. The x-ray generating tube consists of a metal center section (6) having a stationary cathode (8) and a rotating anode (10). Various embodiments are employed for deflecting secondary electrons back scattered from the anode away from the window to avoid overheating of the window. A grounded anode simplifes the mechanisms required to prevent overheating.






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