Cold cathode

Details Cold cathode Cold cathode

1994-12-30

1997-06-03

Hjerpe, Richard

Electric lamp and discharge devices

Discharge devices having a multipointed or serrated edge...

313351, 313336, H01J 130

Patent

active

056357893

ABSTRACT:
Disclosed is a field emission device which has an emitter formed in the center portion where ion bombardment is likely to occur, and a gate formed partially thicker, or which has a metal layer with the same potential as the emitter and a high melting point, formed in the center portion of the cathode. Therefore, even bombardment of positive ions at the center portion of the cold field emission device will not affect the electron emission, thereby ensuring an always stable cathode current or electron beam. Further, as the field emission device is designed to prevent the deterioration of the insulation between the emitter and gate, abrupt stopping of the electron emission hardly occurs. Therefore, an electron tube using this field emission device has a stable function and high reliability.

REFERENCES:
patent: 4008412 (1977-02-01), Yuito et al.
patent: 4498952 (1985-02-01), Christensen
patent: 4721885 (1988-01-01), Brodie
patent: 5030895 (1991-07-01), Gray
patent: 5150192 (1992-09-01), Green et al.
patent: 5191217 (1993-03-01), Kane et al.
patent: 5243252 (1993-09-01), Kaneko et al.
C.A. Spindt et al., "Physical properties of thin-film emission cathodes with molybdenum cones," Journal of Applied Physics, vol. 47, No. 12, Dec. 1976, pp. 5248-5263.

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