Патент USA US2110553код для вставки
Patented Mar. 8, 1938 2,110,553 UNITED STATES PATENT FFICE 2,110,553 ELECTRON TUBE Max Knoll, Berlin, Germany, assignor to Tele~ funken Gesellschaft fiir Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Application August 4, 1934, Serial No. 738,432 In Germany August 2, 1933 3 Claims. being at the same potential as shown in Fig. 2, it is possible to produce a pencil of electron rays of tory of pencils consisting of electrons or ions. rectangular cross-sectional shape. This arrangement according to the invention corn 5 sists in that the electrodes are disposed in such a proximity to the path and are charged up to such potentials that the curves of the paths are influ enced only in one plane, while in the plane at right angles thereto they are rectilinear in form. 10 An exempli?ed embodiment of the invention adapted to act upon the path of electron rays the beam of electrons to be focused or converged in one plane which in themselves would produce at the point of focus a beam of electrons rectangu lar in cross-section with a length materially in excess of the width. The other pair of surfaces, 10 lib, I212, cause the beam of electrons to be con 1b and 2 illustrate forms of the present invention. Referring to the drawing, Hi denotes a tube of a vacuum vessel lined or coated with a metal then a. very small rectangular area. layer in which are con?ned two plates 1 l and if The invention is similarly applicable to in?u encing the path of ionic ray pencils. Having thus described the invention, what I 20 claim is: being of equal length and parallel to the tube axis, and being equally long in the direction of the tube 20 axis. The supposition is that these two plates are at a negative potential in reference to the tube wall l0. Inside the vacuum vessel is also situated a con ventional electron gun structure as shown sche 25 matically at 8, which includes a source of elec trons 9 for producing the electrons which are di rected along a path between the plates ! i and I2. The fact that in this disposition there occurs an action only upon the curves of the paths in 30 one plane, while in the plane at right angles thereto the path curves do not undergo any change in direction, shall be explained for those rays which travel in planes at right angles to each other and which pass through the axis of the tube 35 l 0. The rays traveling in the plane A-A, Fig. 11), shall be indicated by the marginal rays l3, l4. They traverse as they enter and leave the equi— potential surfaces indicated in Figure 10!. by dotted lines whereby curving of the path is produced. 40 The curvature occurs upon entrance into the plates l I, l 2 in the same sense as on leaving them so that the convergence of the rays I3 and Hi traveling in the plane A—A is increased. The cathode rays leave the plates H, l2, as will be seen, inside the solid angle which is bounded by the marginal rays l3’ and M’. The arrangement thus described may be termed an electrical cylin drical lens from its analogue in optics. In the plane being at right angles to the former and which in Fig. 1a is indicated by 3-38, no de?ection of the cathode rays takes place at all, for the equipotential surfaces are traversed by the cathode rays traveling in the plane B-—B ex actly at right angles. 55 In using the construction as shown in Figure 2, one pair of plates, for instance Ha, Ha, cause verged in another plane perpendicular to the plane of convergence caused by the ?rst pair of plates, with the result that the cross-section of the beam of electrons at the point of focus is 15 shall be described in more detail in what follows by reference to the drawing wherein Figures 1a, 15 (Cl. 250-275) The invention is concerned with an arrange ment which serves to act on the path or trajec If the plate arrangement shown in Fig. 1 is used twice, with the two plate pairs Ha, 12a, and l lb, l2b, being mounted at right angles to each other, with two corresponding or cooperating plates 1. In an electron tube, means to develop an electron beam including a cylindrical potential surface, means to position the said surface co axial with respect to the developed beam, a ?rst and a second pair of opposed plane surfaces, 25 means for supporting said pairs of surfaces so that the developed beam passes therebetween with . the plane of said ?rst pair of surfaces normal to the plane of said second pair of surfaces, said sur faces being adapted to be maintained at substan 30 tially the same potential and at a potential nega tive with respect to the potential of said potential surface whereby the electron beam will be con verged and focused into a small and substantially square area. 35 2. In an electron tube, means to develop an electron beam including a cylindrical potential surface, means to position the said surface co axial with respect to the developed beam, 2. ?rst and a second pair of opposed plane surfaces, 0 means for supporting said pairs of surfaces so that the developed beam passes therebetween with the plane of said ?rst pair of surfaces nor mal to the plane of said second pair of surfaces, 45 said surfaces being adapted to be maintained at substantially the same potential and at a poten tial negative with respect to the potential of said potential surface whereby each pair of surfaces will produce a cylindrical electron lens. 3. The method of operating electron beam tubes which comprises the steps of releasing a stream of electrons from a source, directing the released electrons in the form of a beam toward an im pact area, and electrically compressing the beam in perpendicular directions to produce perpen dicular cylindrical lens effects. MAX KNOLL.