Electric lamp and discharge devices – With magnetic device – Field transverse to discharge
Patent
1975-06-27
1976-12-21
Rolinec, R. V.
Electric lamp and discharge devices
With magnetic device
Field transverse to discharge
313231, 315111, 313183, H01J 1704
Patent
active
039990940
ABSTRACT:
A cathodoluminescent gas discharge device having improved modulation characteristics whereby an electron beam generated by the device is more easily modulated by a small control voltage. The improved gas discharge device includes a cathode for generating a gas discharge to be used as a source of electrons. An electron-transmissive extraction grid is spaced from the cathode and receives an electrical potential for extracting electrons from the gas discharge. An electron-transmissive modulation grid is spaced from the extraction grid and receives a control voltage for modulating the flow of electrons through itself. A "drift space" having a length approximately equivalent to at least one ionization mean free path is located between either the extraction grid and the cathode electrode or between the extraction grid and the modulation grid in order to lower the energy of the electrons arriving at the modulation grid so that the flow of electrons therethrough can be modulated by a smaller amplitude control voltage than is possible without the drift space. A target anode is spaced from the modulation grid and receives an accelerating potential for accelerating toward itself those electrons which pass through the modulation grid. The spacing between the target anode and the modulation grid is chosen to be too small, at the gas pressure within the device, to sustain a gas discharge therebetween.
REFERENCES:
patent: 2288256 (1942-06-01), Shepherd
patent: 2495908 (1950-01-01), Rich
patent: 2857542 (1958-10-01), Curtis
patent: 3324348 (1967-06-01), Baker
patent: 3409793 (1968-11-01), Stutsman
patent: 3831052 (1974-08-01), Knechtli
patent: 3882342 (1975-06-01), Kamegaya et al.
patent: 3909652 (1975-09-01), Ferre et al.
Coult John H.
Rolinec R. V.
Sunderdick Vincent J.
Zenith Radio Corporation
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