Patent ID: 6847158

Claim:
An electron gun comprising: at least one cathode for emitting an electron beam; a dish-shaped control electrode comprising a substantially planar part provided with at least one aperture for the passage of the electron beam emanating from the cathode and a skirt at least partially surrounding the cathode; and means for supporting the cathode so as to keep the cathode at a specified distance from the control electrode, wherein the control electrode comprises at least three separate metal components the substantially planar part of the control electrode having a center portion drilled with the at least one aperture which are intended to face each cathode and two end portions, wherein the center portion is connected to each of the two end portions through a curved portion, at least two metal components forming the skirt at least partially surrounding the cathode, wherein the ends of the two components overlap at least partially, and wherein the outer surface of one end of the two components faces the inner surface of the end of the other of the two components, and wherein the two metal components each having peripheries extending outward from the cathode for attaching to the end portions of the substantially planar part.