GB478166A - Improvements in or relating to electron discharge tube arrangements - Google Patents

Abstract

478,166. Discharge apparatus. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. April 21, 1937, No. 11433. Convention date, April 30, 1936. [Classes 39 (i) and 40 (iii)] The split anode segments of a short-wave tube are formed by the inner faces of a divided and tubular member the axis of which is perpendicular to the electrode axis, and the tubular member forms part of an oscillating circuit structure comprising also an outer tubular member coupled at its outer ends, at least for high-frequency currents, to the inner tubular member. In one form, Fig. 2, the cylindrical anode segments are formed by the faces A1, A2, of a tubular member Li, and surround the cathode K. An outer member La is coupled galvanically to the member Li at the ends st. In a modification, Fig. 3, the ends st are closed by caps L<111> sliding on the tubular members, and the members are spaced by insulators O and by the envelope G. The resonator is tuned by movement of one or both caps. One cap may screw onto the outer member, or the caps may be only capacitatively connected to the members. Tuning may instead be effected by a capacity bridge members sliding on the two parts of the member Li or by a sliding dielectric member spanning both parts. These parts may be operated by a lever mounted in a springy glass seal in the wall. The heating leads for the cathode are introduced at a potential node, or along the axis of symmetry. They may include chokes, and short-circuit condensers may be connected between them and the inner 'member Li. An aerial may be capacitatively coupled to the inner member Li or current coupled to the inner surface of the outer member La. The outer member La may form the envelope of the device and may be of non-magnetic material if the device is used in a magnetron arrangement.