US2044347A - Electron tube - Google Patents

Description

June 16, 1936. BRUCHE 2,044,347

ELECTRON TUBE Filed Oct. 5, 1952 00000000 00000000 00000 000 ooooo/ooo INVENT QR ERNST UC Patented June 16, 1936 1 UNITED STATES PATENT OFFICE ELECTRON TUBE Ernst Briiche, Berlin-Reinickendorf, Germany,

assignor to Allgcmeine Elektricitatz Gesellschaft, Berlin, Germany, a corporation of Germany Application October 5, 1932, Serial No. 636,281 In Germany October 19, 1931 1 Claim. (01. 25027.5)

The present invention relates to a new method conducting tube I which has an inside diameter and means to control an electron ray tube of the of 2 or 3 mm. has at one end a flared opening H cathode ray type for use in sound film and telewhich is placed opposite the heated cathode I2 vision work. mounted inside the vessel 6. The conductive tube In electron ray tubes used for sound film and It] may at the same time be used to act as the television work the intensity of the spot produced anode by applying a suitable potential thereto by upon the tube fluorescent screen or end wall due means of the lead l3. The electrons emanating to the bombardment thereof by the cathode ray from the cathode I2 are driven through the conhas heretofore been regulated electrostatically, ducting tube member ID and are made to impinge especially the so-called Wehnelt cylinder having upon the fluorescent screen I lmounted upon 10 been employed for this purpose. inside surface of the end wall of the vessel 1.

Instead of electrostatic control of the bright- By the aid of the coil I5 snugly surrounding the ness or luminosity of the resulting image spot conductive tube In it is thus feasible to influence recourse is bad according to the present inventhe intensity f the electron y p In 0 tion to magnetic control. In controlling the ray er to insure as high as feasible an intensity of 15 intensity in this manner the magnetic field of a the pencil by action of the coil, the latter is discoil traversed by the controlling currents and Posed most suitably at as close a Proximity s whose axis coincides with the axis of the ray possible to the outlet opening of the electron pencil is brought to act upon the latter in such pencil 20, as illustrated in the drawing. Instead manner as to produce a controlling a ti th r of the conducting tube It? there could also be used 0 on. In the practical application of this idea it is a glass tube rendered interiorly conductive, for

essential that the coil should surround the ray instance, by having a lv r ating applied to pencil in a similarly close manner as the Wehnelt e inner Wall- In this case lGhe p 8 a d 9 cylinder. may be dispensed with since the glass tube may The accompanying drawing serves to illustrate be united or fused directly with the cap members the general principles of the invention and show 6 and 1.

two suitable forms of tube arrangements. By the Havin now described the v on What I drawing, Fig. 1 shows the magnetic field applied cla m is! close to the cathode and arranged somewhat like A cathode ray tube comprising an evacuated a Wehnelt cylinder; and Fig. 2 illustrates a modicontainer, means within the container for gener- 30 fied control arrangement using the same general ating a cathode ray, a second container having control principle. provided therein at one end a fluorescent viewing Referring now to the drawing, and first to Fig. screen, an elongated tubular anode connecting 3 1, the cathode ray tube l is shown to include a the separate containers to permit the cathode cathode member 2, an anode member 3 and the ray pencil generated within one container to be fluorescent screen 4 which is rendered luminous passed therethrough to the second container, and by bombardment thereof by the cathode ray pencil electro-magnetic means surrounding the said. 20. To regulate the intensity of the electron ray tubular anode in the space between the two conpencil 20 there is provided a coil 5 which snugly tainers, said electro-magnetic means being adapt- 40 embraces or surrounds the electron ray pencil ed to have applied thereto varying magnitude and which sets up interiorly a field which extends electric signals for producing varying strength in the direction of the electron ray pencil. magnetic fields along the axis of the tubular In another embodiment of the invention, such anode to vary in accordance with the variations as that shown by Fig. 2, ways and means are in the electrical signals the electron concentration 5 adopted to mount the coil exteriorly of the tube within the g at d C d y W thou d minwhile yet the electron ray pencil is made to be ishing the total electron content of the ray so as closely surrounded by the coiL The cathode ray to control the observable intensity 0f the lumitube, according to this modification, comprises nescent efiect produced upon the fluorescent viewtwo parts 5 and 1 which are closed by metal caps ing screen while maintaining constant the elec- 50 8 and 9, and which are inter-connected by a contron flow toward the screenducting tube I0 fitted into the metallic caps. The ERNST BRI'lCHE.

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