US2128759A - Electron tube - Google Patents

Description

Aug. 30, 1938. J. RICHTER ET AL ELERCTRON TUBE Filed July 31, 1934 fizveniars;

JOHANNES RICHTER BERNARD HENSEL KURT HESS Attorney Patented Aug. 30, 1938 UNITED STATES ELECTRON TUBE Johannes Richter, Bernhard Hensel, and Kurt Hess, Berlin, Germany, assignors to Telefunken Gesellschaft fiir Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Application July 31, 1934, Serial No. 737,762 In Germany July 31, 1933 3 Claims.

Cathode ray tubes are known for individual mounting of the electrodes within the glass bulb, as well as for common assembling of the individual electrodes in the leg of the tube. In the latter type of mountain it is suitable in order to prevent breaking of the voluminous assembly reaching into the neck, to stiffen the same in at least two points in the tube. If the cathode neck into which the mounted leg is placed has the same inner diameter at all places, or if the smallest diameter lies near the screen, it has been proposed, for instance, to provide a spacing memher for instance a mica ring having the inner diameter of the neck, for the stiffening of the assembly. However, tubes are also constructed in which'the smallest diameter of the neck is at the beginning, i. e., at the place of sealing of the press of the leg and whereby the inner diameter becomes greater towards the luminous screen. This shaping is for instance more suitable for the reason that on the one hand the influence of the wall charges upon the cathode ray is smaller in the vicinity of the deviation plates due to the larger diameter of the neck, and since on the other hand, a smaller socket can be used for the tube. In such mountings the above mentioned means for the stifiening of the system for instance by means of a spacer disk is not generally applicable.

It is, therefore, proposed that besides the sealing-in of the press, the system mounted on a leg be still further sealed at one or several places possibly far apart from the leg. This sealing may consist of a pure glass sealing or else a metal seal. It is very advantageous to take the latter step. On one or several deviation plates of the system, small screw bushings are sealed for instance. If the system is inserted into the neck, metal wires are screwed into the screw bushings through glass studs provided on the neck, These metal wires serving at the same time as electrode lead-ins of the deviation plates, are securely sealed together with the glass studs. This described method of sealing forms together with the sealing of the press a stiff mounting of the electrode system mounted on a leg.

The drawing shows schematically in Fig. 1, one form of electronic tube embodying applicants invention, and Fig. 2 a detail of the arrangement for supporting the deflecting electrodes.

In the drawing an electronic device I has contained therein the usual form of electron emitter and focusing electrodes which are shown as an electron gun 4. Suitable operating potentials are supplied to the various elements by means of the elements of the electron gun 4 by the conductors 5, 6 and l. Arranged immediately in front of the gun 4 is a pair of beam deflecting electrodes 8 for deflecting the beam in one direction and a second pair of beam deflecting elec- (Cl. 2502'l.5)

trodes 9 and 0 for deflecting the beam in a second direction at right angles to the first plane of deflection. The insulating members 2i! .connected between all of the deflecting electrodes and the anode are suitably secured to the deflecting plates and anode by means of clips or the equivalent I Operating voltages are supplied to the deflecting plates 9 and ill by conductors l3 and I2, respectively, and to the deflecting plates 8 by way of conductor It. Secured to each deflecting plate is a bushing ll having internal threads into which the conductor elements l2, l3 and I6 are suitably screwed and then these various conductor elements pass out through the tube wall by way of the stem members l8. The electrode assembly comprising the electron emitter and focusing electrodes is positioned by way of the stem member l8 and the supporting plate member 2|.

Having thus described the invention, what we claim is:

1. An electronic device comprising an envelope, an electrode assembly including an anode within the envelope for developing a cathode ray beam upon the application of suitable voltages to the various portions thereof, a plurality of electron beam deflecting electrodes, a stem member for supporting the electrode assembly and the deflecting electrodes, insulating members for supporting the deflecting electrodes from the anode and a plurality of conductors connected to the deflecting electrodes and the envelope wall and passing through the envelope wall.

2. An electronic device comprising an envelope, an electrode assembly comprising a cathode and an anode combined within the device for developing upon the application of suitable voltages thereto a cathode ray beam, a plurality of deflecting electrodes, a stem member for supporting the electrode assembly and the deflecting electrodes, insulating members for supporting the deflecting electrodes from the anode, a threaded bushing secured to each deflecting electrode on the side thereof toward the envelope wall, and a single conductor element screwed into each bushing and passing through the wall of the envelope so that voltages may be supplied to the deflecting electrodes and the deflecting electrodes rigidly positioned with respect to the envelope wall.

3. In a cathode ray tube wherein is provided an envelope having a stem portion and side walls, and a plurality of deflecting electrodes, the method of preventing implosion which comprises the step of directly supporting the electrodes simultaneously from the stem and from the side walls.

JOH. RICHTER. BERNH. HENSEL. KURT HESS.

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