Directly heated cathode for an electron tube with coaxial electr

Details Directly heated cathode for an electron tube with coaxial electr Directly heated cathode for an electron tube with coaxial electr

1979-08-27

1981-11-24

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Discharging devices with apertured electrode interposed...

313299, 313348, H01J 146, H01J 2110

Patent

active

043027016

ABSTRACT:
In an exemplary embodiment, a transmitting tube has a coaxial design of the electrodes and their lead-ins and includes a cathode formed of a hollow cylinder which is secured at one end to an annular cathode lead, and at the other end is secured to a cathode cap which is supported at a power supply lead extending coaxially within the hollow cylinder. In this cathode, the carrier is not to consist of wire, so that inhomogeneities on the cathode surface are avoided. To this end, the disclosure provides that the hollow cylinder consist of pyrolytic graphite and be coated with a thin metal layer, preferably consisting of tungsten carbide and thorium, or a thorium oxide.

REFERENCES:
patent: 3591822 (1961-07-01), Katz
patent: 3826948 (1974-07-01), Polese et al.
patent: 4076992 (1978-02-01), Mark
patent: 4119880 (1978-10-01), Wilcox et al.
patent: 4178530 (1979-12-01), Lersmacher et al.

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