SU27980A1 - Hot cathode for discharge tubes - Google Patents

Description

A previously known method of protecting cathodes from spraying using a magnetic field according to the patent. No. 17506 is limited by practical dimensions of the electrodes. In the meantime, in connection with the demands of life, hollow devices must be built with ever greater power. The main limitation is that the radii of the cylindrical electrodes should be referred to as the squares of the mass ratios of the ions and electrons. This makes it necessary to have a small size of electrodes. Therefore, attention was paid to the modification of the design of the electrodes in order to expand the scope of application of this method,

-Patent No. 17506 describes an incandescent cathode for discharge tubes of such a shape that one part of its surface serves to emit electrons, and the other part serves to receive ion shocks, which was designed to protect the electron-emitting part of the cathode from spraying.

The subject of the present invention is another embodiment of the implementation of a hot cathode for discharge tubes along

patent .4 ° 17506 using coaxial electrodes.

According to the invention, the inner or outer cathode is provided with blades, the surface of these blades facing the anode serves to perceive the impact of ions, and the opposite surface is covered with an electron-emitting substance.

In FIG. 1 and 2 schematically depict a proposed embodiment of the cathode.

FIG. Figure 1 shows cylindrical electrodes, cathode A and anode B. A cathode heated by current directly or through heating, or by ion bombardment, has blades a on its surface, arranged in such a way that their inner surface b serves to emit electrons and c-surface to receive ion shocks. A substance with a high emissivity is deposited on the inner surface. In addition, this substance may be deposited in a depression between the blade and the cathode body. Electrodes can be placed in a coaxial magnetic field.

for a better separation of the trajectories of ions 2 and electrons. The magnetic field may be absent. ,

Thus, it turns out that, although the ions and hit the cathode, but do not cause its destruction, as they hit the surface specifically designed for this and from a different angle than the electrons leaving the cathode.

FIG. 2, the outer cathode A is provided with curved blades. The letter B marked the anode.

The subject matter of the invention.

An embodiment of an incandescent cathode for discharge tubes according to patent No. 17506 using coaxial electrodes, wherein the internal or external cathode is provided with blades, while the surface of these blades facing the anode serves for BQ Scoring ion shock and the opposite surface is covered with emitting electrons by matter.

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