US2516853A - Electron discharge device for ultra high frequencies - Google Patents

Description

ELEdTRdN DISCHARGE DEVICE FOR ULTRA HIGH FREQUENCIES Original Filed Feb. 16, 1942 g- 1950 I P G CHEVIGNY ETAL 2,516,853

I IV VEN TORS Patented Aug. 1, 1950 W I 1 Paul Geo ges gheyigny andLEmilejLahin, New

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iemiewithhi'eh ebe ie y lteee ew whi h i a st i tu nenerpee an (7 ee henq ieq I th' ,ki nis t mwhich e be us in:nl cee f h bevi ffe nete fi elee e e em iqe .w t wi en i e e ire fi, three/ 15 81M812 an th 'E PF KE bGtWQQn the er eq si ne lm e v 9 thes ells ,a. Spira mins m m e u' e nw i o e l One 9f h -,,eed mended "and bul e between Littl med e .0 t mak o p i 'i ontec w thl'fihe he end e t enr Thub 'mevin th imem e pend ely in a o v d re s ,t bhengetee size of the oavity yesonator (see F igjfi).

' of the oavity resonator is shown in Fig,j4, wherein whiehioanbe use d inp laee o f jthegayity lgesonator 135 which is threaded to reoeive thethreaqe Bil et snbwninf Ri 1"; a cylindri memb 5'- T r ven h w-mu IF is o a devi ce;-.-hav;lng a different f orgnmf adjustab1e* cavity resonator whio oan b need in place of that shown in Fig. 1. I

ith th hn tewn inn v eriphe s resp c l The construction:-- showngn Eig.; 1 comprises a ofeyl nderfl @133 t is,arrangement thee of centrally locate d filament 10, constit t n t e hecevit re omtvrc l b v r db turmn he cathor ie, coimebted 'ihh'fisum manner with a fila- & 4D Cylindrical member 85 tolincreas epr dect'ease ts ment midpoint lead I: and fi1anient-termina r-qtrusion- 1I -W 1l v 1 d Q 1d t a i i n iq t leads [2 and 5l3vwhich:arelebroughtioi f the he embetl mem th r e k avi re ene o tube through the end of the ins ulating tube wall outsieepf the enve op m ylb m d a ail epe- JFPmIWSfid of a t equ supsta nce through rate part and attached to'the part "protrugi i ng h'theleads r Sta-343d, Th grid l5 ie of the mthrough the envelope, as by brazing andneed cj lindfioalitype which may be ed in, ayellnot necessarily .be the same unitary ;sheet "of knotv n nianner and placed oonoentrically ayogzid. metal; as the part inside ofthe envelope. he T anode 18 e tlierie'el ilf gin er ion th u l e apa ity between con motion eoncentrically;syg'tjonnding the grid h oavityi e opat and ,tube l t' Q l 2 91 anEl gfilaxnente-and is closed at its outer end lfii A sired Zino'l'der'toallow different'D. C. velta eslto cyl indei' act as a 'gu iqegor eooling -air to be applied to the velectrodes. "Ifhe'itfifl ofjthe 19 e que th ira t i emet jma f ei I n l e n tiv a ran m n 'fe e e in the'slz j structural elements of Fig. 1 arelike-nurnlaez egi i one of the eavity resonatonwalls is provjded with .E .e p t enn e b e k on i of there fad c hevlriee ei iu t' l ficevvlt 19 0 $9 att a b b lin gen an u j in 1 3 z ctieej v z eken elee i n EQWP SMe I th nth e v repeater-L Y which is undesirable f1 .om an el eotpical.stand the anode 91-9 which also m yfpeprov ded w th nofl itee [21 1911 o flth p e i :t eqo n inev fins (not shtwgrn)- The wall.otthe tjnsulating'tube pa ity between the anode and'cav ity resonatog', may be seaied to the circumference of the cylinder as used in the embodiments herein, constitutes a 20 by means of the annular's'eal member 2|. A very efiective means for obtaining the capacity coupling,= as'=*the anode offers a' -relatively"large surface close to the tube wall near which the tank member can easily be brought. The location of the plates of the coupling condenser within the evacuated vessel has the further advantage that the condenser plates can be brought closertoi gether without the occurrence of sparking be- M tween them than would be possible in the at-f mosphere; and this enables the coupling capacity.

to be made larger with a consequent desired decrease in the voltage drop across it. I

The constructions according to this invention in which the cavity resonator is brought through envelope meansi 3.;An electron discharge device according to claim 1, in which said hollow anode is closed at on'e end and further comprises a hollow cylinder the glass to the outside of the vessel, while the coupling capacity is placed inside the vessel, is of special advantage, as the portion outside the vessel can be tuned by adjusting the size of the Camry resonator; and'at the same time the cf.- fectiveness of the coupling capacity within the vessel is retained. The use of the coupling capacity between the cavity resonator and the anode is of special advantage because it enables thethigh D. C. voltage ordinarily placed on they anode to, be kept off the resonator. This greatly simplifies problems of insulation, and results in enabling small cavity resonators to be used, which is a requirement for high frequency operause: 'By keeping the'high D. C. anode voltage off the cavity resonator, the cavity resonator can be. placed nearer the cathode, that is with a shoter' "section of glass between the cathode and cavity resonator than otherwise, and as. the high Dgj C voltage is between the anode. and cavity resonator wall, the-required insulation there-betvjfeeii can be provided by a suiiicientlylong sectionl ofthe glass envelope wall'between the cavity, resonator and anode. This keeps the large D. voltage stress away from the glass section between the two walls ofthe cavity resonator which. protrude through the glass, so that the only volt-f age across the glass extending between thewalls is. the oscillating or signal voltage between the anode and grid. This enables the two walls of the cavity .resonator to bebrought quite close together which correspondingly permits the use of a small cavity, resonator, tunable to high -fre-.

quencies.

The tube may be used in any well-known manner, for example, as, an amplifier or an oscillator. As, iswell-known,,to make the tube oscillate, it is onlynecessary to proportion the elements so that a sufficient feedback of energy from theanode circuit to the grid-cathode circuit shall occur to f sustain the oscillations. Energy output may be taken from the devices in a convenient, practical manner. For example, a loop (not shown), may beplaced in the cavity.

Accordingly, while we have described above th principles of our invention in connection with specific apparatus and particular modifications thereof, it is to be clearly understood that this description is made only by way of example and notasalimitation on the scope of our invention as setforth in the objects and the accompanying.

attached at one end about the closed end thereof,

and projecting outwardly through said envelope means.

4. An electron discharge device according to claim 1, inwhich theinside of each side of said resonator is spirally'threaded, and in which the periphery i'of'the ftoroidal resonator consists of a I spiral shaped spring member extending between the threads, of the two sides, the ends of spring member overlapping one another.

15;nn electron discharge device according to claim 1, in which one side of the resonator is provided with an annular opening and further comprises a hollow cylindrical member having one end extending through said opening, and

connection to vacuum tube electrodes comprising a pair of side walls, each of said walls being provided with a corresponding spiral thread, anda spiral-shaped spring member extending between the"tl'ireads of the two walls, the ends of said springmember overlapping each other.

,7. A cavity resonator according to claim 6, in which one end of said spring member is provided with a protuberance engaging the overlapping end of said spring member.

8. .A tunable cavity resonator adapted for connection to vacuum tube electrodes comprising a pairof side walls, one of said walls having an annular, opening, a cylindrical member adapted to enter. said opening, a' pair of annular curved spring members attached within said one of said resonator side Walls, one of said spring members bearingalong the outer surface of said cylindrical member and the other bearing along the inner surface of said cylindrical member whereby curved surfaces are provided from the cylindrical member to the wall through which it protrudes, and means coupled to said cylindrical member for varying the degree of entrance of said member...

PAUL GEORGES CHEVIGNY.

EMILE LABIN.

REFERENCES CITED The following references areof record in the file of this patent:

UNITED STATES PATENTS the

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