Dual-mode electron gun

Details Dual-mode electron gun Dual-mode electron gun

H - Electricity

01

J

353/12

H01J 23/06 (2006.01) H01J 23/065 (2006.01)

Patent

CA 1198819

IMPROVED DUAL-MODE ELECTRON GUN By Richard B. True ABSTRACT An improved dual-mode electron gun includes a close-in and a further control grid to control the laminar flow of electrons which pass from the smooth spherical surface of a cathode toward an annular anode. In the high mode of operation, the close-in grid is maintained, for example, at +36 volts while the further grid is maintained at +250 volts. During the low mode of operation, the close-in grid is maintained at -36 volts while the further grid potential is +250 volts. The two control grids are divided into inner circular and an outer annular areas. The close-in grid has more conductive elements in its outer annular area than in the same area of the further grid. The two grids are then aligned so that the close-in grid functions as a control grid to block the flow of electrons from the outer annular area during the low mode of operation and as a shadow grid for the further control grid during both low and high modes of operation.

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