US2189906A - Electronic discharge tube - Google Patents

Description

Feb. 13, 1940. A. .KA'rscH ELECTRONIC DISCHARGE TUBE Filed Jan. 16, 19:57

`Patented Feb. 13, 1940 Unno STATES PATENT ELEcTRoNIo Disclamer TUBE Annemarie "Katsch, Berlin-Lichterfelde, `Gicl'- many,`assignor to C. Lorenz Aktiengesellschaft, Y `Berlin-"I'empelhof, Lorenzweg,` `Germany, a

company Application January 16 1937, `Serial No. 120,895

l In Germany January 16, 1936 3Claims.r

In` the construction of `electronic discharge valves or tubes glass bulbs are used in most cases to form the discharge vessel thereof. Glass Vesl l appear from `the following description and be 'particularly pointed out in the appended claims,

reference being had tothe accompanying drawing that shows a partially diagrammatic sectional View in a medial vertical plane ofone embodiment of theinvention.

In this drawing,y Agdenotes the anode, K the cathode, G the grid which inthe case represented by way of example is a wire helix whose turns E, F are supported by shanks E, F in a well known manner. These are fastened in a socket 3 of` a metal disc B, this disc thus supporting the grid G by means of the shanks E, F.- Cathode Kis' arranged to extend through socket y3. Anode A has` cooling ns Wthe two outer of which4 are each integral with a ring P.

'The discharge vessel D is composed of ceramic portion Wl, W2, Wand a glass 4top U. The portions WE. W2 are held together by ametal ring Q shrunk thereon. Equally, the portions 4W2, W3 are held together by the two rings P shrunk onto them. Portion U is provided with a tubular extension if, where the vessel is connected with the pump and where it is sealed off, as is well known with devices of this kind. Glass portion U is united with the ceramic portion W3 by melting.

In order to provide for-airtightnessthe ceramic portions Wl, W2, W3` are shaped outside by grinding so as to intimately contact with the rings P, Q shrunk thereon. In this connection attention is called to the factl that the glass walls' of discharge vessels donot allow of tooling them in this manner, especially because they are too thin in this regard. The airtightness alorded in this way is raised to vacuum tightness by melting `glass or a ceramic glazing or the like onto the butt joints so as to produce melting spots S.

The leads of the electrodes are sealed into the crestaim ori-"HCE wall .of the vessel, except `those portions thereof which are annular and are shrunk ontoV theves-V sel, such as the rings P. f :V

Ring Q, lor any other ring ofsimilar disposition,imay form one coatingof a condenser C` whosepther coating is a metal ring 2, `an annurlar dielectric 4 being arranged between the two.

- In orderto avoid that during the process of y producing .the melting spots S' too much heat is carried away by the electrodes concerned, in accordance with the invention the `path between the vl() e spots Sfand the main body or active part of ther electrodes is made as largedasv` possible. This should bedone especially becausethe anode A has a relativelyflarge mass. In the example represented this path is formed bythe rings Pand the l outer cooling nn W integraltherewith,`thus being .long enough toprevent the .heat from being carried away to an extent elect o'fy the melting.

that would impair the` r The invention is not only` suitable for combinn ing ceramic parts with form a vacuum vessel metallic ones in order to as` described herebefore,

but maybe employedalso whenever in a discharge tube metal partsare to be connected with `ceramicparts,` For` instance, it is possible to support' within the tube .the electrodes, thereof by means l of ceramic studs ior Shanks and to shrunk metal ing in their turn connected toV the electrodes 'rings onto such ceramic members, these rings beproper. `The 'ceramic studs or the like may likewise be formed integral with the vacuum vessel. l

Discharge tubes as providedv `by the invention are much less liable knownand besides are easy to manufacture.

What is claimed is: r. r l

1. An electronic discharge tube havi ramic vessel, electrodes in said vessel, and a ring integral with one of the electrodes located outside and shrunk on the Vessel.

electrode leads of which extend directly through to injury than those hitherto the wall of the vessel whereby the provision lof a press isobviated.

3. A discharge tube according to claim 1, corn-` prising a condenser having an clement constituted by one of said metallic portions.

ANNEMARIE KATsoH.

40 2. A discharge'tube` according to claim` 1,` the J

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