(19)
(11) EP 0 589 606 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.02.1995 Bulletin 1995/05

(43) Date of publication A2:
30.03.1994 Bulletin 1994/13

(21) Application number: 93307233.2

(22) Date of filing: 14.09.1993
(51) International Patent Classification (IPC)5: H01J 23/065, H01J 25/34, H01J 1/88, H01J 3/02
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 24.09.1992 GB 9220226

(71) Applicant: EEV LIMITED
Chelmsford, Essex, CM1 2QU (GB)

(72) Inventors:
  • Arnold, Barry James
    Colchester, Essex C05 0NR (GB)
  • Shakespeare, Brian Alfred Henry
    Chelmsford, Essex CM2 9BE (GB)

(74) Representative: Cockayne, Gillian et al
GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Electron gun arrangements


    (57) An electron gun arrangement which is particularly suitable for use in travelling wave tubes includes a substantially cylindrical ceramic body (20) which partly defines a vacuum envelope. The body (20) surrounds an electrode assembly constituted by cathode (21), grids (22,23 and 24) and an anode (25). The leads to the grids and cathode are extensive in a generally longitudinal axial direction at the end of the body (20) remote from the anode (25), electrical connection being made via pins (30-33) and metallised apertures (26-29) extensive longitudinally through the wall of the body (20). The internal diameter of the body (20) may be stepped to define ridges (38-40) to which supports for parts of the electrode assembly are fixed.






    Search report