Electron gun with a gamma correct field emission cathode

Details Electron gun with a gamma correct field emission cathode Electron gun with a gamma correct field emission cathode

1996-07-08

1998-12-15

O'Shea, Sandra L.

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

313309, 313306, 313307, 313496, 3151691, 345 74, 345147, H01J 130, H01J 1924

Patent

active

058501207

ABSTRACT:
An electron gun includes a field emission cold cathode (1) having a first electric potential, a primary gate electrode (2) having a first opening around the top of the cathode (1) and having a second electric potential which is higher than the first electric potential for causing an electron emission from the top of the cathode (1), and a second gate electrode (3) having a second opening around the top of the cathode (1) and having a third electric potential which is higher than the first electric potential and lower than the second electric potential, wherein a first voltage defined as a difference between the first and the second electric potentials varies in proportion to a second voltage defined as a difference between the first and the third electric potentials so as to provide a current-voltage characteristic having an apparent gamma-property. The apparent gamma-property is such that the luminous output of a fluorescent substance (7) of an anode (8) is directly proportional to a signal voltage.

REFERENCES:
patent: 5070282 (1991-12-01), Epsztein
patent: 5150019 (1992-09-01), Thomas et al.
patent: 5191217 (1993-03-01), Kane et al.
patent: 5336973 (1994-08-01), Leroux et al.
patent: 5555000 (1996-09-01), Sarrasin et al.

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