US1895867A - Getter capsule - Google Patents

Description

R. H. SINDEN GETTER CA'PSULE- Jan. 31, 1933.

Filed Nov. 50, 1929 Patented Jan. 31 II-X'Zv-Zi UNITED STATES AT ROGER HULL sinnniv, or cALnwnLL, new JERSEY, AssreNoaro wnsrmenonsn LAMP COMPANY, A CORPORATION 'or' rnnnsynvnmnv 1 5 L p 1 GETTER cArsULE Application filed November so, 1929. seaa1fm 41 e9s.

The present invention relates to getter capsules for electrical discharge devices such as radio vacuum tubes, photo-electric .cells and related devices;

Getter capsules are used extensiv ely in connection with the above mentioned devices to enclose a getter material, or

which will liberate the getter material under the action of heat, and dispense th to the interior of the tube.

chemicals e material Getter capsules of the disc type in common use comprise two pieces of thin metal such as nickel secured together so as to enclose the material between the pieces, one

piece having a struck-out portion to afford a container for the material. In the manufacture of the disc type capsules it'is the practice to dispose the struck-out portion at the center of the pieces and spo t weldthe pieces together at spaced points around the margin thereof. The capsule is then mounted in the tube, the tube exhausted,

sired the metal parts, therein freed .from' occluded gases by high frequency and if deinduction heating means, the capsule heated by the same means to liberate the getter material into the interior of the tube to combine with the residual gases remaining in the tube and -in some instances to drop of the tube.

Considerable difiiculty has perienced, especially when a chemical comregulate the cathode been expound of the getter and a reducing agent are employed, in heating the capsule sufficiently to effect the chemical action and liberate the getter from the capsule without heating other parts to undesirably high temperatures. 7

One object of my invention is to provide an improved construction of getter capsule which will enable the sameto be manufactured readily and at thesame time provide a capsule which may be heated to effect complete reduction of the chemicals therein and liberate the getter without the a of an excessive amount of heat.

pplication A 'fi he flobject invention .isjtc so i construct a fcapsulefthat the, material which liberatesthe getter-will be disposed. at -the' i more strongly hea't'ed portion of the capsule. Y

According tofmy invention,'I.-form my im-j o proved capsule from two metal pieces at east one of which has a; struck-outportion "adjacent its margin to form a container for the getter material orthe chemical com- 2 pound of the getter Imaterial and a reducing 5 7 agent. ,The pieces aresecured togetherfover the getter material by spot welds "at suitable omts or byotherdesired fastening means."

. Vith this arrangement I am enabled to disduced therein, the. central portion being heated less thanthe margin portions. Placing the getter [containing portion at the margm also-Provides forthe portions of; the tube, the rupture occurring at the point where the margin of, the struckoutportionfand discscoincide.

In the drawingFig. 1 is a sideelevation al .75

view of a disccapsule embodyinglmy-inven tion, applied to a photo-electric cell; Figs. 2;and 3,,are a -top,plan and. side elevational views on an enlarged scale of parts shown in Fig. 1, the views beingtaken at 90 from 80 .theposition shown in Fig.1. r

' Figs. 4 and!) 'aretop, plan and side eleva tionalviews ofa modifiedform of capsule embodying my lIlVfiIltlOIl. F at V Referringto Figssl, 2 and 3 an embodi- 85 ment'of my invention is shown applied to a fphoto-electricgcell which comprises an .en-

velope-l having a reentrant stem"2,ta press: "3 of saidstem scaling in leading-in and supv port'wires 4 for a cathode 5 and a supportand i g ENToFFme I controlofthegpoint" at which the capsule will rupture sothegetter -,70v may be liberated and deposited at desired.

these affording a COIIta1I111'1g f t leading-inwire 6 for an anode'il The anode 7'also serves as a capsule for getter material and consists of two thin metal pieces 8 each "having a struck-out portion 9 to afford a con taining spacelO for the gettermaterial.

The pieces may be nickel or other suitable metal and secured together as for example misch metal.

by welding. Thestruck-out portions 9 are i disposed at the marginsof the plates 8 rather than in the central portions for reasons above disclosed.

10 and may consist of caesium dichromate" andragreduclng agent su ch;as ealcium-;;or heating the anode 7 I Upon by' high frequency induction, the marginal v a 1 1929;], V A getter material' is placed in the spaces a,

7 3. gettercapsule comprising two metal pieces. at least one of said'pieces having a struck-out. portion for a jgetter' material the struck-out portion being eccentrically disposed relative to the pieces so that said:.por-- Vtion will be at the hottest portion of the pieces when the capsule is heated'byinduction currents.

' In testimony whereof, I have hereunto sub scribed myname this 29thday of November,

7 "portionof the pieces 8 are'heated"to'higher' temperatures than other parts of'the' anode 7 I a thus affording suflicientrheatto Tefiect th jereduction ofthe caesium,compound withthe jterio'r {of the envelope: By, disposing the "consequenti-liberation of; caesium tothe .in-

' vstrufkQo'ut I ort1on9l adjacent-f theffro'nt of at that point: on i the "envelope,"

7 Referring to Figs; 4 and 5 offthe 7 another embodiment of 'in'y" invention 7 is heenvelopel the caesiumfmay h deposited shown ini 'hich the capsule 7" comprises two hottest portion: of the point Within the tube to be deposited. Q R g I r V Althuogh I have disclosed'my invention as containing space Q10;

7 the getter material;

fing only twometalpieces, I "tion adjacent the marginof at least one of plates 8", only one of which has a pressed out portion 9" welded at points 11" .tolsecurejthe same-over to afijord a gettermaterial Theiplates are spot I Pressed outp ortionv 9' 'is jdisposed'at the margin otthe' plate for,

the same reasonsstated relative to the cap-, sule By my inventiong 'it will be seen that I am enabled to provide a getter capsule'compris- 'a pre'ssed out porgetter material. By this arrangement, I a m 7 enabled toheatfthe getter materialby the applied to a photo-electric cell ,it is to-be un} discand to select the tat'whichthe getter 4 derstood that the capsule constructed accordance' with my invention 3 may be applied V vacuum tubes L and related devices Vherever it is desirable to liberate a. getter a material to'lower the cath d drop fth J 1 What is claimed'is': I

p 1. A getter capsule comprising metalpieces r at least one ofsaidpiieces having astruckout portion to provide-a: containingspace for containingspace ber a" getter material said ing disposed eccentrically with respect'tothe centerof said pieces. 1

rial.

1 Q'RQGERI new 8mm;

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