US2203249A

US2203249A - Electron discharge device

Info

Publication number: US2203249A
Application number: US236411A
Authority: US
Inventors: Bohme Joachim
Original assignee: Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
Current assignee: Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
Priority date: 1937-10-27
Filing date: 1938-10-22
Publication date: 1940-06-04
Anticipated expiration: 1957-06-04

Description

June 4, 1940. J. BOHME- ELECTRON DISCHARGE DEVICE Filed Oct. 22, 1938 INVENTQR. JOACHIM B O HME fl 1 W ATTORNEY.

Patented June 4, 1940 UNITED STATES ELECTRON DISCHARGE DEVICE Joachim Biihme, Berlin-Schoneberg, Germany,

assignor to Fides Gesellschaft fiir die Verwaltung und Verwertung von gewerblichen Schutzrechten mit beschranktcr Haftung,

Berlin, Germany, a corporation of Germany Application October 22, 1938, Serial No. In Germany October 27, 1937 2 Claims.

This invention relates to an electron discharge device particularly suitable for use at high frequencies.

Push-pull tubes in which the two electrode 5 assemblies operating in push-pull as well as the essential parts of' the oscillatory circuit have been accommodated inside one and the same glass vessel or bulb have previously been suggested. The particular purpose of such an ar- 1 rangement has been to make it unnecessary for the current leads to carry RF currents, and as a result such difficulties as are attendant upon the sealing of the-current supply wires arising in tubes of the conventional types are obviated. To this end the lead for the high potential supplied to the plate is connected with a point along the internal oscillatory circuit where the alternating potential is of zero value. The RF energy generated in the tube is delivered from the tube and fed to the consumer or load by means of capacitive coupling from the outside. This coupling is usually effected by having on the outside of the tube metallic surfaces such as laminations or sheets or gauzes, which, conjointly with the 25 plates or anodes confined within the vessel, result in coupling condensers.

Now, the present invention is concerned with an improvement upon the type of tube previously disclosed and which results in an appreciable simplification both in structure as well as in operation.

According to this invention, in a push-pull tube the metallic parts which represent the outer coats of the coupling condensers form the wall or shell of the vessel. Inside these walls are two push-pull connected electrode systems including the essential elements of the oscillatory circuit. Inasmuch as each anode or plate must cooperate with an outer coat of the coupling 40 condenser the tube either in transverse or longitudinal sense is divided by an insulating, for excharge device made according to my invention,

and Figure 2 shows a schematic section of a modification of the electron discharge device shown in Figure 1.

Figure 1 illustrates a tube whose metallic shell is divided in the transverse sense by an insulation body 3, the cup-shaped halves of the metal envelope being denoted l and 2. Coni'ointly with the anodes or plates 4 and5, these halves constitute the coupling condensers before mentioned. The leads brought to the consumer or load circuit are united in some suitable manner with the wall parts i and 2. The two

cathodes

8 and 9 are united into a common construction .unit," and the same is true of the two grids 6 and l. The

anodes

4 and 5 are inter-connected by a clip l0 whose inductance primarily governs the frequency of the oscillations generated in the tube. The lead l3 for the high potential of the plate is connected with the symmetry point II of this clip. In a similar way the grid lead M is'united with the symmetry point of the connection be tween the grids 6 and 1 preferably in the form of a metallic cylinder Ma. The insulation body 3 has a hole l2 through which the clip ill may be passed. Similar holes are formed in the insulation body for the grid and the plate leads, the said holes being conveniently sealed, say, by solder at the end where the lead-wires come out of the insulator piece.

The tube here disclosed, as will be noted, combines in a simple way an electrode system suited for the generation of ultra-short Waves together with the necessary coupling elements, and arrangements are so made that none of the leads iscalled upon to carry RF energy, with the result that such difficulties as will otherwise arise in the construction of these leads Contrasted with other tubes of the push-pull type described, a tube as here disclosed offers principally the merit that the mounting of distinct coupler means outside the tube shell is obviated, and such mounting may in some instances tend to make the mounting of the device more difficult. For the purpose of supporting the tube in the rack the tube preferably is propped at suitable points of the insulator part 3. The latter may, in fact, be built so as to make it more adapted to this end.

Another embodiment of a tube according to the invention is shown in Fig. 2. This tube is divided longitudinally by an insulator part resulting thus in two wall parts l5 and I6. Cooperating with wall portion I5 is the anode or plate l1, grid l9 and cathode 2|, While with the wall part It cooperate the plate 22, grid and the filament la. The lead 21 designed to bring in are obviated.

of the insulation body for the reason that thesemay be readily fashioned in all kinds of forms and shapes, and since they are easy to work. Moreover suitable methods have been suggested or disclosed in the prior art by which the metallic Wall may be intimately united with the ceramic partition piece. The material mostconvenient v for the metallic parts of a tube or vessel wall or shell is copper, though also other metals or alloys are serviceable, most especially those adapted to result in excellent fusion or soldered junctions with vitreous or ceramic intermediary part.

While I have indicated the preferred embodiments of my invention of which I am now aware and have also indicated only one specific applica tion for which my invention may be employed, it will be apparent that my invention is by no means limited to the exact forms illustrated or the use indicated, but that many variations may be made in the particular structure used and the purpose for which it is employed without departing from the scope of my invention as set forth in the appended claims.

I claim:

1. An electron discharge device having an envelope comprising a pair of metallic cup-shaped members with their open ends oppositely disposed to each other, a partition of insulating material between said cup-shaped members and sealing said cup-shaped members together with an air- 2. An electron discharge device having an envelope comprising a pair of metallic cup-shaped members with their open ends oppositely disposed to each other, a partition of insulating material between said cup-shaped members and sealing said cupshaped members together with an airtight seal, a cathode member extending through one of said cup-shaped members and through said partition to provide a cathode in each of said cup-shaped members axially of said cup-shaped members, a grid in each cup-shaped member surrounding the cathodes, said grids being connected and supported by a tubular member extending through and supported by said partition, an anode surrounding each of said grids, a conductor connecting said anodes and separate conductors connected to said anode conductor and to said tubular member for providing voltage leads to said grids and anodes, said partition enclosing the separate conductors connected to the anode conductor and the tubular member and providing a seal therefor between the metallic cup-shaped members. M

JOACHIM BOHME.