US2428013A

US2428013A - Electron tube

Info

Publication number: US2428013A
Application number: US449104A
Authority: US
Inventors: Louis H Crook
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-06-30
Filing date: 1942-06-30
Publication date: 1947-09-30
Anticipated expiration: 1964-09-30

Description

Sept. 30, 1947;

L. cRooK ELEc'rRN TUBE Filed June 30, 1942 INVENroR. Agi/a 36 @uva/af) Arron/v5 ys Patented Sept. 30; 1947 UNITED STATES PATENT OFFICE ELEc'rRoN TUBE Louis H. Crook, Washington, D. C. Application June 3o, 1942, serial 1410. 449,104

(el. 25o-27) 12 Claims. l

This invention relates to electron tubes having a plurality of electrodes.

It is an important object of this invention to provide an electrostatic shield for an electrode within an electron tube and to dispose the shield extending outwardly through the wall of the tube to shield a conductor connected to the electrode.

It is a tfurther important object of this invention to provide integral shield means housing the current sources and the conductors connecting the current sources with the electrodes in an electron tube, and with the shield means extending through the wall of the tube to shield the electrodes of the tube.

It is a further important object of the invention to provide shielded sources f direct current shielded by shielding means extending through the wall of an electron tube, and to connect these direct current sources with other sources, or loads, external to the shielded sources by magnetic coupling.

It is an important object of this invention to assemble the electrodes, the direct current sources, and the conductors connecting the sources with the electrodes, of an electron tube Within a shielding arrangement which enters through a wall of the tube to shield the several circuits of the tube against outside disturbing influences.

Other and further important objects of the invention will be apparent 'cfrom the following description and the accompanying drawings.

In the drawings:

Figure 1 illustrates an electron tube having internal shields which extend through a wall of the tube to house external current sources' and connecting wires. Part of the illustration is in section and part diagrammatic.

Figure 2 is an end view in plan of an electrode of the tube shown in Figure 1.

In Figure 1 there is shown an electronic tube or triode I0, which is provided with a cathode II, a control grid I2, andan anode I3. The triode elements are housed in a gl-ass envelope I4.

For purposes of illustration, the glass envelope is shown as substantially spherical, and the triode elements within the envelope generally dene portions olf spheres.

The cathode II is formed of an annulus I5, bent as shown in Figure 1, and a central terminal element I6 with a plurality of laments I I connected extending between the terminal i6 and the ring I5. Current is supplied to the cathode from a lbattery I8 through a conductor I9 connected to the tenminal I6, and a return path is provided by a somewhat hemispherical shield 20 connected to the ring I5 within the tube and extending outwardly from the tube as a conduit 2l and conductively connected to a. casing 22 which contains the battery I8 and to which one pole of the battery is connected, as indicated at 23.

The cathode supply is, therefore, entirely contained in a shielded system. The metal of the shield is of good conductivity, so that the conductor I9- is effectively shielded against disturbing outside iniiuences.

The control grid I2 may be a'. perforated plate Vor an annulus 24 supporting integrally connected grid wires as in conventional triodes, and the grid structure is bent to conform to the general shape of the cathode in spaced opposed relation to it. A generally hemispherical shield 25 is conductively connected to the ring 24 and this shield extends outwardly of the tube as a conduit 26 and envelopes the shield 2l) in the tube and a portion of the conduit 2l. The conduit `26 bends at an angle to the conduit 2I through an elbow, indicated at 21, and a wall of the elbow is cut away to permit the conduit 2I to pass through it, and is insulated from the conduit 2| by insulation indicated at 28.

The conduit 26 is conductively connected to a casing 29 which houses a battery 30, and one pole of the battery is connected by a conductor 3| within the conduit 26 to a point on the conduit 2i, as is indicated at 32. The other pole of the battery 30 is connected through a secondary winding 33 of a. suitable transformer 315 to the wall of the casing. The primary winding 35 of the transformer 34 is outside the casing for connection to a suitable source indicated at 50, and the

windings

33 and 36 are magnetically coupled by a core 36 of suitable magnetic material extending through a wall of the casing.

The grid circuit is, therefore, within an equipotential shielded systefm.

The anode I3 may be spherical and is suitably positioned with reference to the grid. The anode is also within an equipotentional shielded system. A somewhat hemispherical shield 31 is placed within the tube and about the anode I3, and this shield extends outwardly of the tube as a conduit 38 which is conductively connected 40. One pole of this battery #l0 is connected by a wire 4I Within the conduit 38 to the anode I3, and the other pole of the battery is connected to ,the casing, as indicated at 42, through a primary winding 43 of a transformer 44. A secto a casing 39. The casing 39 houses a battery j 3 ondary winding I is disposed outside thecasing 39 for connection to a suitable load indicated at 5l, and the windings 43 and 45 are magnetically coupled by a core 46 of suitable magnetic material. The anode and cathodecasings are conductively connected to lcomplete the cathodeanode circuit, and this conductive connection is indicated at 41.

The glass envelope i4 is suitably sealed to the metal conduits 26 and 38 by the conventional glass soldering method, and vacuum seals of suitable insulating material seal the space between the conduits 28 and2l, and the bore of the conduit 38, and the bore of the conduit 2l, as indicated at 48, 49, and 63, respectively.

The leads I9, 3|, and 4I are suitably supported in their housing conduits by thin and spaced insulating supports 52, if necessary.

The elements within the tube may be varied as to shape to suit speciiic uses of the tube.

According to the provisions of the patent statutes, I have set forth the principle and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that Within the scope of the appended claims the invention may be practicedv otherwise than as specically illustrated and described.

I claim as my invention:

1. An electronic tube including an envelope and an electrode within the envelope, a source of current connected to said electrode, and a conductive shielding conduit housing said source and entered in said envelope in conductive engagement with said electrode.

2. An electronic tube including an envelope and an electrode Within said envelope, a source of current, a conductor connecting said electrode with said source, and conductive metallic shielding means connected to said source and engaging said electrode and housing said source and said conductor.

3. An electronic tube including an electrode, a source of current, a, conductor connecting said source with said electrode, and conductive metallic shielding means connected to said source disposed enveloping said source and said conductor, said shielding means extending through the wall of the tube and being disposed in shielding relation about said electrode within the tube.

4. An electronic tube including an envelope and an electrode within the envelope, an external source of current, a iirst conductor connecting said source with said electrode, and a second conductor connecting said electrode with said source and enveloping said source and said iirst conductor both within and without said envelope.

5. An electronic tube including an electrode, a source of current outside said tube, conductive shield means housing said source and entered in said tube, and conductor means connecting said electrode and one pole of said source and disposed within said shielding means, said shielding means being connected to the other pole of said sorce and also to said electrode Within the tu e.

6. A non-grounded circuit arrangement including an electronic tube having an envelope, an electrode in said envelope, a source of energy connected to said electrode, anda conductive shielding conduit housing said source of energy and its connection to said electrode, said shielding conduit extending through said envelope and being shaped interiorly of said envelope to eiect a shielding of said electrode therein except for l a predetermined path for electron flow. whereby the complete electrode circuit is shielded both inside and outside said envelope other than for aid electron path.

'7. In a non-grounded electronic tube circuit` v envelope except for a predetermined path of electron flow within said envelope.

8. In an electronic tube, an envelope, a plurality of electrode circuits including inner and outer conductors and `contained within the outer conductor extending into said envelope', shielding means inside said envelope shielding said electrodes one from the other except for a predetermined path of electron flow, and energizing means contained within said outer conductor outside said envelope.

9. In an electronic tube arrangement, an electronic tube including an envelope, a cathode and an anode in said envelope, means connecting said cathode with a potential establishing apparatus outside said envelope, means connecting said anode in a potential circuit including apparatus outside said envelope, conductive shielding means enclosingA the cathode. potential circuit and extending within said envelope, conductive shielding means enclosing said anode potential circuit and extending within said envelope, and conductive means connecting together the shielding means for both said circuits outside said envelope. A

10. A non-grounded circuitarrangement including an electronic tube having an envelope, a plurality of electrodes in said envelope, a source of energy connected with each said electrode, and conductive shielding means housing each said source of energy and shielding and forming a part of the respective electrode circuit independentiy of the other electrode circuits except for a predetermined path for electron iiow within the envelope.

11. A non-grounded circuit arrangement including anhelectronic tube having an envelope, a plurality of electrodes in said envelope, a source of energy connected with each said electtode, and conductive shielding means housing each said source of energy and shielding and forming a part of the respective electrode circuit independently of the other electrode circuits except for a predetermined path for electron now within the envelope, certain of said conductive shielding means being in the form of conduits. the inside surface of one of said conduits being used as one leg of one circuit and a part of the outside surface of the same conduit being used as a leg of another circuit.

12. An electronic tube comprising a glass envelope into which an electrode circuit extends, said circuit including a rst electrode having a metallic casing extending without the envelope, another electrode circuit extending into said envelope, said other circuit including a second electrode having a metallic casing extending without said envelope and within the first said metallic casing, and energizing means for said circuits 5 within one of said 'metallic caslnss outside said Number envelope. 1.383.914 LOUIS H. CROOK. 2,178,775 v 1,645,643 REFERENCES CITED l 2,107,387 The following references are of record in the g'wzm le of this patent:l 1 001,330 2,235,414 UNITED STATES PATENTS 2,278,210 Number Name Date 1o 2,223,082 2,280,980 Samuel Apr. 2a, 1942 2.331.723 2,094,360 Landon Sept. 28, 1937 1,618,319 Weinberger Feb. 22, 1927 2,207,346 wom July 16, 1940 ,Number 2,088,722 Potter Aug. 3, 1937 1I 723324 6 Name Date Hoxie -1.. June 28. 1921 Bunger et al. Nov. 7, 1939 Crook Oct. 18, 1927 Potter Feb. 8, 1938 Seiler Aug. 22, 1939 Engbert May 14, 1940 White Mar. 18, 1941 Morton Mar. 31, 1942 Van Mierlo Nov. 26, 1940 Perc1va1 v.v oct. 12, 1943 FOREIGN PATENTS.

Country Date France Jan. 13, 1932