GB202047A - Improvements in or relating to electron discharge devices - Google Patents

Abstract

202,047. Western Electric Co., Ltd., (Western Electric Co., Inc.). May 12, 1922. Vacuum tubes.-The containing-vessel of a thermionic valve or other discharge device comprises. a metallic portion forming the anode and a glass portion which is united by fusion or welding to a portion of reduced thickness of the anode; means are described for supporting the other electrodes and for cooling the valve. The anode 1 consists of a copper cylinder coated with tin, with a tapered and flared open end 5 which is fused to the tapered end of a white limeglass portion 4. Dimensions of the anode are given. The support for the grid and filament comprises a hollow steel tube 6, the lower squared end of which fits in a plate 9 of lavite or other insulating material. Two bent plates 11, 12. Fig. 2, secured around the tube, are spaced from the plate by a sleeve 13<1>, and are welded to T-bars 13, 14 mounted on a collar 15 fitting around a re-entrant stem 16. The upper end of the tube is squared, and fits into two plates 17, 18 of lavite. The upper plate 18 fits loosely in the anode, and is spaced by a flange from the plate 17. A helical grid 22 is wound around wires 21 fastened to the plate 17 and passing freely through the plate 9 so as to allow expansion. The grid lead-in wire 23 is sealed into the end of a long tubular extension 24 of the stem. The filament 25 is wound in zig-zag fashion around hooked wires 26 fastened in the plate 17, and around hooked wires 27 passing loosely through apertures in the 'plate 9 and welded to springs having portions 29, 30 of different dimensions the larger portions 29 being shielded from heat by the plate 9. One end of the filament is secured to one of the wires 26, which is welded to the upper end of the tube 6, connection being made through the T-bar 13 with a lead 34. The other end of the filament is connected by another wire 26 with a lead 35<1> passing through and insulated by a glass or quartz sleeve 35 from the tube 6, connection being made with a lead 36. The valve may be cooled by a pipe 43, Fig. 4, or by insertion in a vessel 40 through which water, oil, or other medium is circulated. The glass portion 4 is mounted in a leather or heavy rubber washer 44 secured by rings 45, 46 to the base of the vessel, so that the leads extend below. When an insulating cooling liquid such as oil is used, the valve and leads may be immersed in the liquid.