Linear electron beam tubes

(19)

(11)

EP 0 753 877 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	29.01.1997 Bulletin 1997/05

(43)	Date of publication A2:
	15.01.1997 Bulletin 1997/03

(21)	Application number: 96304943.2

(22)	Date of filing: 04.07.1996

(51)	International Patent Classification (IPC)⁶: H01J 23/15, H01J 25/04

(84)	Designated Contracting States:
	DE FR IT

(30)

Priority:

12.07.1995 GB 9514172
25.07.1995 GB 9515232

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

(72)	Inventor:
	Pickering,Alan Hugh Chelmsford, Essex (GB)

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

(54)	Linear electron beam tubes

(57) In a tube such as an IOT, an electron gun includes a cathode 2 grid and anode surrounded by a resonant input cavity 5. A grid lead 10 supplies a voltage to the grid 3 and includes a filter comprising a capacitor 11 and inductor 12 which are both approximately one quarter wavelength long at a selected frequency to reduce or prevent rf leakage along the grid lead. The grid lead is arranged to extend through the cavity 5 and is located within the interior space which is surrounded by the annular cavity 5.

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