US2164699A

US2164699A - Electron discharge device

Info

Publication number: US2164699A
Application number: US242702A
Authority: US
Inventors: Richard U Clark
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-07-06
Filing date: 1938-11-28
Publication date: 1939-07-04
Anticipated expiration: 1956-07-04

Description

July 4, 1939. R CLARK 2,164,699

ELECTRON DISCHARGE DEVICE Original Filed July 6, 1937 nun manna IN VENT OR.

ATTORNEYS.

Patented July 4, 1939 2,164,699

iliTED STATES PATENT OFFIQE ELECTRON DISCHARGE DEVICE Richard U. Clark, Fort Wayne, Ind.

Original application July 6, 1937, Serial No.

152,014. Divided and this application November 28, 1938, Serial No, 242,702

2 Claims. (Cl. 250177) The present invention relates to electron dis- There is provided a non-conducting partition charge devices and more particularly to a novel l5 having an outer diameter greater than that construction of vapor electric tube primarily of the plates. This partition has a. central openadapted for the generation or by-passing of aping which forms a close fit or contact with the 5 preciable amounts of electric current of either outer surface of the common cathode. 5 an alternating or pulsating nature, when prop- The

grids

5 and 6 as well as plates or anodes erly excited by direct or alternating current from H and I2 abut against the partition i5 which any suitable external source, as shown in my Reacts as a screen or baffle to prevent stray arcs issue Patent No. 20,727 issued May 17, 1938. between the adjacent tube sections. It also 10 This application is a division of my copending serves to center and anchor the multiple grids 10 application Serial No. 152,014, filed July 6, 1937, and plates. I on Electron discharge device. The common cathode or electron emittin One of the objects of the present invention is means may be of the oxide coated type, of caesito provide a novel construction of vapor electric ated metal, or of any other type suitable for use tube employing a readily ionizable atmosphere, with alkali metal vapors. In the disclosed emin combination with a common electron emitting bodiment it comprises a tube-like sleeve Iii exmeans, a plurality of associated grids and anodes nd ou e partition enclosing hea and means for permitting a free but controlled ng C011 l7, Which coil is connected to the sleeve flow of electrons from substantially the entire It by Suitable connection a W urf e of the emitting mean The

grids

5 and 6 are connected through a by- Another object of the present invention is to passageway Which extends from point Wit provide in a vapor electric tube having multiple ne g id. outwardly through the partition l5 and grid and anode elements, a common cathode or into the adjacent grid, Such passageway being 0f electron emitting means so constructed and ara size and displacem Sufficient y-p s the ranged 3, to permit a free and complete flow of fiOW of electrons and ions from one portion Of 25 electrons from substantially its entire emitting the cathode to another at such times as the grids surface t one plate ,1; a, time, prevent simultaneous emission to the plates. In

The above features, advantages and capabilithe particular form shown in Fig. 1 for accomties of my present invention will become apparent pushing this Object I have ShOWh tWO Such p sfrom a description of the accompanying draw- SageWayS i9 and 20 Which are of arcllate Shape 30 m in which I have m t t d one form of my and extend through the partition l5 outside of invention but the form there shown is to be the p p y 0 the grids but have their intake understood as illustrative only and not as definand discharge ends terminating Within e p ing the limits of my invention except as exy 0f the spressed or intended to be expressed in the ap- It is obvious that these communicating passage- 35 pended claims. Ways may also extend outside the plates if de- Fig. 1 is a view partly in section of an electron sired, or by pr p y Shielding the p a es and leads discharge device illustrating an embodiment of a vir ually C osed passage will exist from either my invention, end of one grid, around the tube structure, back Fig. 2 is a cross sectional View showing a modit0 the end of the Other g d permitting the flow 40 ficaticn thereof. of cathode emission, provided the grid end shields Referring to the drawing in detail there is (115- have suitable openings or ducts therein. closed an evacuated bulb l in which is mounted In Fig. 2 a modified form is shown in which a common cathode or electron emitting means the partition 2i extends Vertically instead of horiprovided with leads 3 and 4 for supplying heater zcntally, as shown in Fig. l and the by-passage- 45 excitation. This common cathode may be

heated Ways

22 and 23 corresponding to the by-passageeither indirectly or as a filament. Surrounding ways 59 and 20 of Fig. 1 are arranged horizontalor encompassing the electron emitting means are ly instead of vertically as shown in Fig. l and provided

multiple grids

5 and 6 having heat pass through the partition at a point outside radiators i and 8 connected-to lead wires 9 and the periphery of the grids and arranged to have 50 i8, respectively. Surrounding these grids are their intake and discharge ends terminating plates or anodes H and i2 connected to lead within the periphery of the grid, and as in Fig. 1,

wires l3 and M, respectively. The grid heat these by-passageways are of a size and displaceradiators "l and 8 are employed to maintain the ment suflicient to bypass the flow of electrons and grids cool and to reduce the grid emission. ions from one portion of the cathode to the other at such times as the grids prevent simultaneous emission to the plates. By this arrangement the free flow of electrons from substantially the entire surface of the cathode or electron emitting means is permitted to one plate at a time when the tube is in operation notwithstanding the partition tightly fits around the cathode and notwithstanding the Icy-passageways extend outside the periphery of the grids.

In my preferred form the anodes and grids are made of compressed and sintered powders of conducting materials including rhenium or other metals of high oxidizing temperatures, and poisonous to electron emission, and carbon, all proportioned to afiord minimum electron emission and at the same time a maximum heat radiation from such parts.

The particular form disclosed may be employed with satisfactory results in oscillating circuits to convert the input into alternating or pulsating current from applied direct current source. This type of tube is particularly important in low voltage oscillating circuits such as are necessarily employed in operating radio sets.

Having thus described the invention I claim:

1. An electric discharge tube having an envelope and an electron emitting cathode, anodes and grids therein made of compressed sintered powders of conducting materials, including metals of high oxidizing temperatures and poisonous to electron emission together with carbon proportioned to afford minimum electron emission and a maximum heat radiation.

2. A substantially non-emitting electrode for electron discharge tubes made of pressed sintered powders of conducting materials including metals or" high oxidizing temperatures poisonous to electron emission together With carbon proportioned to afford minimum electron emission and maximum heat radiation.

RICHARD U. CLARK.