GB195594A - Improvements relating to electron discharge tubes for generating x-rays - Google Patents

Abstract

195,594. Metropolitan-Vickers Electrical Co., Ltd., (Assignees of Slepian, J.). April 1, 1922, [Convention date]. R÷ntgen-ray tubes. - A varying magnetic field adjacent to the cathode controls the path of the electrons to an anode or target so as to increase their velocity. By this means hard rays may be produced with relatively low voltages between the electrodes. In one arrangement, Fig. 1, a discshaped container 1, having a cathode 4 heated by current from battery 5 and an, anode 6 near the edge, is mounted between the disc-shaped pole pieces 9, 11 of a U-shaped magnet 12 which may be energized by a winding 13 in series with a battery 15. A winding 16 mounted around the edge of the container is energized by alternating current or a condenser discharge, and produces varying magnetic and electric fields which cause the electrons to move to the anode in spiral paths. In another arrangement, Fig. 4, a container 17 of toroidal shape, with a cathode 4 close to the inner wall and an anode 6 close to the outer wall, is mounted in a laminated iron core 18 of the shell type. A winding 23 mounted around the central part of the core is energized by alternating current or a condenser discharge. Magnets 27 of segmental shape are mounted above and below the container so as to produce transverse magnetic fields near the inner and outer walls of the container, thereby deflecting electrons from these walls. A source of energy 8 may be connected between the anode and cathode or may be omitted. Vacuum tubes.-The Specification, as open to inspection under Sect. 91 (3) (a), comprises also the application of the invention to electron discharge tubes. This subject-matter does not appear in the Specification as accepted.