Field emission type electron gun

Details Field emission type electron gun Field emission type electron gun

1988-10-27

1990-03-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313449, H01J 2958, H01J 2946

Patent

active

049104420

ABSTRACT:
A field emission type electron gun comprises a cathode, an anode placed opposing the cathode, a filament placed obliquely above the anode in a space between the cathode and anode to heat the anode, a control electrode and a vacuum container housing the cathode, the anode the control electrode and the filament. The anode has an elongated body with a through hole at its center, the control electrode is provided near the anode, and means for rendering the electric potential of the control electrode to be negative to the electric potential of the anode is provided to concentrate an electron beam to the top end of the anode.

REFERENCES:
patent: 3250936 (1966-05-01), Pua
patent: 3659135 (1972-04-01), Van Roosmalen
patent: 3869636 (1975-03-01), Lawrence
patent: 3890533 (1975-06-01), Tanaka
patent: 4019077 (1977-04-01), Sakifani

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