US1675586A - Electron-discharge apparatus - Google Patents

Description

W. C. WHITE ELECTRON DISCHARGE APPARATUS July 3, 1928. A 1,675,586

Original Filed June 5. 1922 Im/entor I /\/i||iarn QWH CQ,

- His fittprn ey.

, Patented July 3, 1928.

"UNITED STATES.

WILLIAM 0. WHITE,

PATENT ore-res;

OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY,'A CORPORATION OF NEW YORK.

ELECTRON-DISCHARGE APPARATUS.

Original application filed June 5,- 1922,

In the operation .of electron discharge devices of the type here involved,- particularly for the amplification ofhigh frequency cur-Q l rents, ditliculty is experienced because of the capacity which is present between the grid and anode electrodes. By reason of this capacity the efficiency of such devices for amplifying purposes when employed in the usual manner is greatly reduced. A further object of my invention is to provide a con struction which will reduce to a minimum the capacity between these two elements,

thereby permitting their operation at a higher elticiency than has heretofore been possible.

It has been customary in the past to bring all of the leading-in conductors which sup- ,ply current to the electrodes out at one end of the receptacle in which the electrodes are enclosed and to provide a base for the receptacle consisting of ametalshell which enclosesa disc of insulating material in which the contacts through which current is sup-c plied to the device are mounted. The addition of this base to the deviceresults in an appreciable increase in the capacity between anode and grid electrodes,- which is objectionable for the reason above set forth.

In carrying my invention into effect I eliminate this objectionable feature in the present form of the three-electrode electron discharge device. This is accomplished by extending the leading-in conductors which supply current to the electrodes only a short distance outside of the tube and arranging them in such a way that the ends of the leading-in conductors are adapted to make di-- rect contact with contact members through which current may be supplied. 1 also bring the leading-in conductor which supplies current to the anode out of one end of the tube and the leading-in conductor which supplies current to the gridout of the oppo- Serial-No. 566,024.. Divided and this application filed March 27, 1924. Serial No. 702,450.

site end of the tube. As a result the capacity between these leading-in conductors which 15 present in the usual tube construction is almost completely eliminated, the

only capacity between the two electrodes being the llllilVOltltlblC- capacity present by reason of their parallel relation. By cutting off theleadmgun conductors so that they extend only a short distance outside the tube the portions extending out oi the tube will be rigid enough to serve also as supports for the tube and it will be possible to securely support the tubes from suitable contacts s0 positioned as to make contact with the leading-in conductors extending from the opposite ends of the tube.

The no\-'el-features which I believe to be clmracteristic of my invention are setforth in the appended claim, the invention itself however both. as to its organization and method of operation will best be understood by reference to the following description taken in connection with the accompanying drawing in which Fig. 1 is a perspective View of an electron discharge device constructed in accordance with my invention and mounted in a suitable holder; and Fig. 2 is a plan View of the same with-a portion of the holder cut away.

As indicated in the drawing the electron discharge device comprises a tubular receptacle' 1 containing a cylindrical anode 2 and grid and filament or cathode electrodes within this anode. The filament, which is not shown, is supported from its opposite ends by the supporting members 3 and 4. A leading-in conductor 5 is connected to the supporting member?) through a spring 6, which provides the desired tension on the filament, and leading-in conductor 7 is connected to supporting member. 4 through a transverse arm 8. A leading-in conductor 9 supplies current to the grid, which is not shown, but which is'supported on a rod 10. The anode. 2 is supported from its two ends by the arms '11 and 12. The arm 11 is attached to the transverse arm 8 but insulated therefrom by means of ahead 13 of insulating material and arm 12 is attached to a bridge 14 of insulating material through which the leading-in conductors 5, 7 and 9 pass.

By this constructionit .is possible to astheir desiredspaced relation before they are sealed into the tube. Current is supplied to the anode by meansof a leading-in con-, ductor 15, which is connected-to the armll through a flexible connection 16. The leading-in conductors 5, 7, 9 and 15 are made a to extend only. a short'distance outsideof the receptacle 1. Inthis way even-though the leading-in conductors are comparatively flexible, the portion extending outside of the receptacle .1 will be sufiiciently rigid to securely support the device.

I have shown in the drawing as a supporting means for the device described a base 17 having mounted thereontwo flexible contact members 18 and 19 positioned just far 'enoughapart so that whenthe receptacle l-is placedbetween them the leadingin conductors 9-and will make contact with both of these spring members.- An

upright support memberp2o, which is mounted on the base 17 carries the two spring contact members 21 and '22, which" are preferably in the same plane as contact member 19, and these contact members 21- and 22 are arranged so as to make contact with the ends of the leading-in conductors 5 and 7 through which current is supplied to the filament. The upright member is provided with an opening 23, which serves as a guide for the insertion of one end of the device into the holder. The

guide member 2a is also provided for con- 1 venience in guiding the opposite end of the device so that the leading-in conductor 15 will malrecontact with the contact memberpreferred embodiment of my invention it will be apparentthat my invention is by nomeans limited to the particular embodb ment shown anddescribed but-that many modifications in the form and arrangement of theelectrodes of'the electron discharge device, as well as in the manner in which the contact members are arranged, may be made-without departing from the scope of my invention as set forthin the appended claim;

That I-claim'as new and desire to secure.

by Letters Patent'of the United States, is K A mounting for an electron discharge device comprising abase member, a pair of flexible contact members mounted thereon,

a supporting Imembcr v provided with an o'pemng,'a pair of spring contacts mounted on the supporting member at opposite sides of said opening, said spring contacts and -one of said flexible contact members being located in'su'bstantially thesame plane, the other of said flexible contact members being mounted in a plane substantially parallel to the first mentioned plane.

In witness whereof,- I have hereunto set my hand this 26th day' of March, 1924.

WILLIAM c. WHITE.

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