Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1982-03-29
1986-06-03
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
313349, 313454, H01J 2948, H01J 146, H01J 2946
Patent
active
045932301
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.
REFERENCES:
patent: 3484645 (1969-12-01), Drees
patent: 3859552 (1975-01-01), Hechtel
patent: 3903450 (1975-09-01), Forbess et al.
patent: 4165473 (1979-08-01), Falce
patent: 4471267 (1984-09-01), Amboss
Richard True, An Ultra-Laminer Tetrode Gun for High Duty Cycle Applications, Dec. 1979, IEDM presented in Wash. D.C., USA, pp. 286-289.
Barron Jr. Gilberto
Blum Theodore M.
Litton Systems Inc.
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