US1941110A - Electron discharge device - Google Patents

Description

Dec. 26, 1933. v. l.. RoNcl Er AL 1,941,110

ELECTRON DISCHARGE DEVICE Filed Dec. ll, 1929 V L. HoNc/ ATTUHWEY Patented Dec. 26,v 1933 wenn \ i I: ELECTRON DISCRGE DEVICE; 5 l a 'viet'eijnmnetBrooklyn, and-Auen remettra@ New York, N. Y..vassignors to Bell TelepllollA s.

Laboratories, Incorporated, New

.a corporation of NewYork I 1 L Application December l11, 19,29l

York, 151-552,

scleimsirol.259%275) l rounds the Yfilament and is supported by a collar .l engaging" the stem. The leading-in' wiresv4 for the filament are sealedjjin the stem and extend outwardly to a baseV carryingfterminals attached "heavy wires 1'? vveldedfto,V a' collar rv18 clamped v,around the stem`13. Ahelical wire grid 19 issupportedby rods'jZOfrom a reentrant stein 21 ^to an extension of lthe'iglass vessel 'and thesefterjminals conduct low voltage ytoy the filament for Y heating it and causing emissionA of electrons to the plate electrode. When the device susedas l y Y coaxially withtheftrl'tde 16. The detailed conan oscillation generator or amplier' ofhigh Ypower exceedingly highrvoltages'arefapplied to the plate electrode to obtain high'power` output. In order to prevent corona discharge or leakage between the low potential iilamentV terminals and the high potential plate terminals, the plate electrode leadingin wires are connected to radial terminals projecting from a metallic band fastened to the outside wall-of the vessel near one ,preferably of isolantite, whichl is attached to end. This arrangement overcomes the close spacing of the high potential and low potentialv terminals so that the insulating base is not destroyed vby destructivev discharges arcing across the various terminals and substantiallyincreases lthe insulating paths betweenvrthe filament and plate terminals to insure uniform and eiiicient operation of the device over a long period of service.

The various features of this invention will be Vmore readily understood'from the following detailed description with reference to the accompanying drawing in which y Fig. 1 shows in elevation an electron discharge device partly brokenvaway to show the interior electrode structure and illustrating the location of the various terminals for the electrodes in accordance with this invention;v

Fig. 2 is a perspective View on an enlarged scale of the metallic terminal carrying band for the anode of the device; and

Fig; 3 shows in perspective the mounting of the device on a base and the support therefor. Referring particularly to Fig. 1, the electron discharge device comprises a glass enclosing vessel havingV a large diameter center portion 10 and end 'portions 11 and 12l wires 25 serve to 'form a large surface toimof smaller diameter. A plurality of concentric glass walls are disposed within the end portion 12 with the outer edgeof the outer walljoined to thelglass portion 12 to outerwall joined tothe inner end of the next succeeding wall to form an outwardly extending stemlA, and the outer "endof the second wall joined toanfendof the innermost wall to' form formnareentrant stem 13, the other end of the 5,0

another rcentrant'stem Y(not shown) terminating '55 in a press portion 15. This arrangement provides 4Va. long insulating path 4between the lament and anodeleading-n' wiresv within the device.

' A 'iilamentary cathode Y(not shown) lis supported from the press portion'l and aA large. surface anodeV 16 is attached to the stem 13 by attheptliergcnd of'the vessel 10 and disposed 'struction of the electrodes and their assemblyin the Sdevice is fully described in a'co'pending" ap- "plication oi V. L.'Ronci and H. W. Ericsson'er.

Noi413,164 filed December 11,1929.' The .iila- 39 m'ri'leadingin wires k22 are embedded in' rthe press 15 and extend outwardly through the stern 14V and are attacl'fedv tof 'pintypeitermin'als l23 carried by a cup-shaped 'insulating member 24 cemented to the glass portion 11 and carries a f metallic pin type terminal in which the twisted wires 25 are soldered. The multiple leading-in press'the high frequency signal current on the control or grid electrode 19.

When the device of the `type disclosed is used as an oscillation generator or amplifier of high power, exceedingly high potentials are `applied .to the anode or plate electrode 16 and there'is danger of corona leakage or disruptive arc discharge between thehigh potential anode terminals and the low potential filament terminals.

In ,accordance with this invention leakage between the anode and filament terminals exterior of the enclosing vessel is prevented by placing the Aanode and filament terminals a relatively long distance apart. The anode leading-in wires 28 within the device are connected to the heavy 'i110 A thimble type insulating plug 26 of iso- 'd ,I antite having an annular flange portion 27 is 1, glass vessel having a reentrant stem, a filament. ,and a plate electrode supported from saidstem, 'abase havingterminals for said' filament atwires 1'7 by metallic strips 29 welded thereto and are embedded in the stem 13. Flexible lengths of wire 30 are attached to the leading-in wires 28 and bent over the edge of the end portion 12 of the vessel and soldered to radial pin terminals v3l projecting from and carried 'bya collar 32 encircling the end portion 12 at I'an appropriate distance from the lament terminals. Asishoiwn in Fig. 2 the collar comprises two semi-circular slotted metallic bands 32 provided with anges 33 which are clamped togetherby screws;34. Between the collar and the glass portion '12 is a strip of yieldable insulating vmaterial138, such as asbestos. The terminal 'pins 31 are attached to -oset portions of thecollar 32 Vintermediate the ilanged ends 33 and the offset portions form cavities to allow the wires 30 to enter the termiinals 3l. sulating path between the anode and filament terminals and also provides a relatively 'long air gap therebetweeinthus preventing arcs and other discharges between the terminals whereby uniform and eiiicient operation of the device over a Y long period of service is assured.

y f What is claimed is:

1..An electron discharge device comprising a tached to said stem, and a terminal carrying member embracing said vessel and connected to said plate electrode.

2. An electron discharge device comprising a glass vessel having a reentrant stem, a filament and plate electrode supported from said stem,

Vva base having terminals for said lament at tached to said stem, and a terminal memberhavu i-ng two symmetrical portions clamped about said vessel and connected to said piate electrode.v

' 3. An electron discharge device comprising an enclosing an electrode supported Within said vessel, a metal band encompassing said vesradial 'terminals extending fromsaid band, and an electrical connection between said electrode and said terminals. Y v

4.. An electron discharge device comprising an l,enclosing vessel havingan extending portion, a

reentrant stern within said portion, an electrode 'supported from said'stem, a ,plurality of leadingin wires attached to said electrode and extending This arrangement increases the .innr

another of said electrodes.

Vclamped-to said vessel, terminal pins on said col- .lar,-and an electrical connection between said electrode and said terminal pins.

6. An electron discharge device comprising a :glass vessel :having an extending end portion, an

outwardly extending stem and a reentrant stern terminating in a press portion concentrically disposed 4within saidA end portion, an electrode suprported 'from said press portion, a base member of insulating material mounted on said extendying-stem, terminal pins on said base member, and leading-in wires for said electrode embedded in saidpressportion and connectedto said terminal pins.

7. An electron'discharge device comprising a glass vessel, a reentrant stem, an outwardly extending stem, and a press disposed concentrically with respect tosaid vessel,.a `lament supported from vsaid press, a base having Yterminals for said filament attached to said extending stem, iilament leading-in wires-embedded in said press' and connected to said terminals, an anode within said vessel supported from said reentrant stem, a metallic vband surrounding said vessel remote from Asaid terminals, and a multiple electrical connection -between vsaid anode and said band.

' 8. In combination, an electron discharge device comprising a glass vessel having an extending portion at each endareentrant stem within one portion, an electrode mounted on said stem,

.a metallic band surrounding saidY portion, terla'nenclosing vessel, a plurality of cooperating andV relectrically separate electrodes mounted within said vessel, aterminal member extending from each end of said vessel, electrical connections between -said terminal members and two' of said electrodes, Aa metallic band clamped about said vessely 4intermediate said terminal members, and an velectrical connection between said band and ALLENv I. CRAWFORD. VICTOR L. Ronin. c

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