Patent ID: 7042146

Claim:
Electron gun comprising at least one emissive cathode of substantially tubular shape, held in place using support means comprising: an eyelet surrounding the cathode, and a metal plate substantially parallel to the longitudinal axis Z of the gun comprising a central part folded so as to partially surround the eyelet, this central part having in the direction of the longitudinal axis a width L′ and two side arms extending on each side of the central part, the side arms having in the direction of the longitudinal axis a width L″ and being terminated by ends folded so as not to be aligned with said arms, said ends being dedicated to be inserted into a glass bead, wherein a connecting region that connects the central part to the side arms has, in the direction of the longitudinal axis, a width L which is greater than the width L″ of the side arms in the same direction, wherein the width L′ is less than the width L.