Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1994-12-22
1997-02-18
Lee, Benny T.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 533, 313309, 313351, H01J 2304
Patent
active
056044011
ABSTRACT:
An electron beam having a high current ratio between the high and the low current modes, susceptible to no significant change in beam diameter and relatively free from ripples in both modes is formed. This electron beam is used to realize a highly reliable, simple-structured and compact microwave tube which performs nearly optimal RF operations in both modes. The gate electrode or the emitter electrode, in which emitters are formed, of a field-emission cold cathode is divided into a plurality of parts, and the area in which electrons are emitted is switched over by varying the voltage applied to this divided electrode to make possible switching between two current modes, the high and the low. Alternatively, the current ratio between the high and the low current modes is made settable by making variable the connections between three or more parts into which the gate electrode or the emitter electrode are divided.
REFERENCES:
patent: 4145635 (1979-03-01), Tuck
patent: 4163918 (1979-08-01), Shelton
patent: 5124664 (1992-06-01), Cade et al.
Lee Benny T.
NEC Corporation
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