Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1978-01-20
1979-06-26
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
313352, 313361, 250396R, 219121EB, H01J 2316, H01J 2996
Patent
active
041594401
ABSTRACT:
An evacuated enclosure in the form of a cylindrical cavity having a dielectric located therein defines a dielectric guide for transporting an electron beam introduced into the cavity. The dielectric, which is disposed about the cavity wall, is operative to trap the charge associated with normal vacuum expansion of the electron beam. The trapped charge, in cases where the injected electron beam is not space charge limited, modifies the electric fields within the cavity in such a way as to provide focusing forces on the electron beam propagating through the cavity, the focusing forces being sufficient to quide a major portion of the beam through the enclosure without attenuation. Within the injected beam is space charge limited, the trapped charge induces an electrical discharge--either surface flashover or volume puncture of the dielectric--which liberates gaseous material. This gas then ionizes, is attracted by space charge electric fields into the body of the beam, and provides space charge neutralization. In this situation the beam is confirmed by its self-magnetic field and propagates through the cavity with little attenuation.
REFERENCES:
patent: 3412196 (1968-11-01), Figgins
patent: 3914637 (1975-10-01), Bennett
patent: 4079285 (1978-03-01), Little
Chatmon, Jr. Saxfield
Spire Corporation
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