Electron gun having a low capacitance cathode and grid assembly

Details Electron gun having a low capacitance cathode and grid assembly Electron gun having a low capacitance cathode and grid assembly

H - Electricity

01

J

313/35.33

H01J 29/48 (2006.01)

Patent

CA 1149003

Abstract The present invention relates to an electrode assembly. The assembly is comprised of an annular insulating support member having a front face, a rear surface, and a portion defining a frusto-conical major interior surface extending between a central circular front opening adjacent the front face and a substantially smaller central circular rear opening adjacent the rear face. A first disk-shaped grid electrode is provided of a size not substantially exceeding that of the smaller opening and is disposed overlying the smaller opening and bonded at its periphery to the support member's rear surface. A second, non-planar grid electrode is bonded to the support member's front surface, the second electrode including a recessed portion extending into the front opening to position a central region of thes second electrode in closely spaced relation to the first grid electrode. The recessed portion has a frusto-conical surface disposed in axially aligned closely spaced relation to the frusto-conical interior surface of the support member. A cathode electrode is provided having an activated, electron emissive surface. Finally, a unit is provided which includes an insulating member bonded to the rear surface of the annular support member for mounting the cathode electrode with its electro-emissive surface closely adjacent the first grid electrode. The first and second grid electrodes each include a central aperture. The apertures of the electrodes and the electron emissive surface of the cathode are arranged in mutual alignment.

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