PL15555B1 - A method of producing cathode ray tubes with high emissions. - Google Patents

Description

Priority: February 2, 1928 (Germany). The invention relates to a method of producing high-emissivity cathode lamps for cathode ray tubes, e.g., amplifiers or rectifiers. According to the invention, the cathode, if appropriate after a suitable pre-treatment of its surface, is a metal with high emission properties, e.g. barium, strontium, calcium or their mixtures. The essence of the invention consists in the fact that at least two chemical compounds are led to an exchange reaction in such a way that the desired material has A high emissivity property, such as barium, is liberated as metal and superimposed on the cathode. The method is described below in a specific embodiment. The lamp being emptied is housed in a powdered mixture of barium oxide and silicon. This mixture, suitably shaped, in the given case by adding binders or other materials that prolong the course of the reaction, and pressing in the shape of pellets, is placed in the lamp bulb so that heating can take place. not this mixture. When a pellet is ignited in a vacuum, an exchange reaction takes place between its components, during which silicon oxide is formed on the one hand, and metallic bar on the other. It is best to apply a vacuum of 10-4 to 10-7 hours, since the reaction takes place at a light heat temperature while emptying the gas from the lamp bank. The metallic bar is dispersed in the form of a metal vapor in the bancelamps and, with the appropriate arrangement, it settles on the cathode surface, so that the components involved in the reaction are placed on the cathode surface or on their own. constitute the cathode. When the surface of such a cathode is heated or electrically discharged, the reaction proceeds in the above-indicated direction that constantly small amounts of metallic barium are formed. Similarly, on the basis of known reaction equations, it is possible to generate metallic sodium, potassium, or other suitable metal. The method according to the invention may be used several times in the manufacture of one lamp in order to produce several different metals or one after the other, or at the same time by reacting the appropriate compounds. Instead of silicon, it is possible to use iron, silicon, aluminum, magnesium or similar materials. ly. Using the method according to the invention, it is possible to remove the usual spraying inside the lamp of a metal that absorbs gas residues, e.g. magnesium, because a sufficient amount of metal vapor is released during the reaction, and Figures 1 and 2 show two examples of the interior of the lamps the products with which the invention may find application. Fig. 1 shows a set of three electrodes for a cathode ray tube mounted on a lamp post, which set consists of a cathode, a grid and an anode, shown in longitudinal section. Inside the anode is a pellet, made of a mixture of the components involved in the reaction, and Fig. 2 shows a metal vessel placed next to the lamp electrode assembly, in which the material used for the reaction is placed at the bottom. whereby the reaction takes place when the vessel is heated, for example by bombardment with electrons or by inducing currents of high frequency therein. PL

Claims (11)

Patent claims. 1. A method of producing high-emission cathode ray tubes, characterized by placing a mixture of components inside the lamp, between which an exchangeable chemical reaction may take place, during which a metal of significant mission ability is released, e.g. bar, when the gases are evacuated from the lamp, a higher reaction takes place, so that the highly emissive metal that is sputtering during this reaction partially settles on the lamp angle. 2. The method according to claim 1, characterized by the fact that an exchangeable chemical reaction between the constituents of the mixture is triggered or sustained by heating the mixture, 3. The method according to p. 2, characterized by the fact that the components involved in the reaction form the surface of the cathode or the cathode itself, because the reaction is carried out so slowly that over a long time, small amounts of material with a longer capacity are constantly formed issue. 4. The method according to p. 3. The method as claimed in claim 3, characterized in that reaction extenders, for example one of the reaction products, are added to the mixture placed on the cathode. 5. The method according to p. 1-4, the significant point is that the components involved in the exchange reaction are materials such that the materials resulting from the reaction are solids! at normal temperature. 6. The method according to p. 1, 2 and 5, the significant point is that the mixture of reaction components is used in the form of pellets, compressed from this mixture with the addition of binders or materials which extend the reaction. 7. The method according to p. 1-6, it is known that barium oxide and silicon, or iron-silicon, aluminum, magnesium or the like are used as reaction components. 8. The method according to p. 1, 2, 5-7, characterized by the fact that the mixture of components involved in the reaction is heated by heating one of the electrodes, especially the anode, 9. The method according to p. 1-8, a significant area where one of the biological components involved in the reaction is a metal which, during the reaction, sprays and absorbs gas residues contained in the lamp envelope. 10. A variant of the method according to claim 1 to 9, characterized by the fact that during the evacuation of the lamp, various materials of high emission are simultaneously or sequentially produced from the respective reactions. 11. A cathode ray tube manufactured according to the method according to claim 1, 2, 5-9, characterized by the fact that the mixture of reaction components is placed in the vessel by a metal adjacent to the electrode assembly. Bernhard Loewe. Deputy: Inz. Th. Raczynski, patent attorney at HG. and RG. 2 ^^ Print by L. Boguslawski and Ski, Warsaw. PL