US2222021A - Oxide cathode - Google Patents

Oxide cathode Download PDF

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Publication number
US2222021A
US2222021A US254653A US25465339A US2222021A US 2222021 A US2222021 A US 2222021A US 254653 A US254653 A US 254653A US 25465339 A US25465339 A US 25465339A US 2222021 A US2222021 A US 2222021A
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United States
Prior art keywords
mesh
cathode
parts
wires
band
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Expired - Lifetime
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US254653A
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English (en)
Inventor
Etzrodt Adalbert
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Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
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Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape

Definitions

  • the invention relates to a heated oxide coated cathode for electric discharge tubes and particularly to the metallic wire support for such an oxide coated cathode.
  • An object of the invention is to produce a cathode construction which has a high electron current supply and very great mechanical strength and rigidity against vibrations.
  • Another object is to provide a cathode, especially for gas or vapor filled discharge vessels which are subject to various shocks, which cathode does' not lose its form through mechanical strain.
  • Fig. 1 is a perspective view of a preferred embodiment of the supporting and conductive metal framework for the oxide coated cathode.
  • Fig. 2 is a diagrammatic view of the electrical connections to Fig. 1.
  • Figs. 3 and 4 are enlarged diagrammatic views of portions of the wire mesh illustrating various arrangements between supporting standards.
  • Figs. 5 and 6 are diagrammatic views illustrating still further modifications in the form of the wire supporting structure.
  • the directly heated oxide coated cathode consists of band-formed parts for carrying the oxide coating and these band-formed parts preferably consist of a netting or interweaved wire mesh arranged to correspond to the side surfaces and diagonal surfaces of a prism, preferably a regular prism.
  • the metal thickness or mesh width of the individual mesh parts or the manner of their connection to the support rods is selected so that all surface parts of the cathode have a practically uniform specific power output.
  • Fig. 1 is disclosed a preferred embodiment of the invention.
  • the support rods l, 2, 3, and 4 carry both the mesh surfaces 5, 6, l, and 8 which form the side surfaces of a parallelepiped and the surfaces 9 and II] which form the diagonal 45 surface of the prism.
  • the mesh parts are welded or otherwise secured to the support rods.
  • the diagonal surfaces are preferably made in the manner shown in the figure, as two rectangular mesh strips, bent together, along their edges 50 II and having a wire clamp l2 slipped thereover and preferably welded to both edges.
  • the invention has the specific advantage that the power given by the individual surface parts per unit area can be made practically uniform.
  • Fig. 2 the electrical connections in proportions that permit a uniform loading of the cathode throughout its construction.
  • the support rods are indicated by I3, 14, l5, l6; v the side surfaces by ll, l8, I9, 20; and the diag- 10 onal surfaces by 21, 22', 23, and 24.
  • One pole of the filament battery or other source of power is connected at points l3 and i5 and the other, at points M and 16.
  • the resistance of the side surfaces should preferably be increased in the ratio 15 of the square root of two to one in order that heating on all surface parts of the cathode be equally great. Various means can be utilized to accomplish this result.
  • the wire mesh of the side surfaces may be made with a larger mesh 20 width.
  • the resistance of a band of wire cloth is determined by the angle to which the .band is cut off and connected with the lead-in rods.
  • Fig. 3 shows a gauze band on which the current lead wires 25 and 26, welded with the band, are arranged parallel to wires 21 of one group of wires forming the mesh.
  • the lead wires 28 and 29 are at an angle of 45 to the wires of the gauze band.
  • the resistance of an equally long band in the case of Fig. 4 is approximately one and a half times greater than in the case of Fig.
  • the desired resistance ratio can be produced quite simply by cutting the mesh bands for the preparation of the diagonal surfaces parallel to the wires of the net and the bands for the preparation of the side surfaces at an angle of 45 to these wires.
  • Fig. 5 A further modification of the invention is disclosed in Fig. 5.
  • the emitting surfaces here correspond to the side and diagonal surfaces of a regular hexagon.
  • the mesh parts are supported by the support rods 30, 3
  • the desired uniformity of power distribution and therefore, the strain of the individual parts can
  • the described cathode at the same time has very great strength.
  • Fig. 6 shows another possibility for connection of the cathode diagonal surfaces of Fig. 1 or 2.
  • the mesh bands 36 and 31 which form the diagonal surfaces are bent in the manner shown in Fig. 6 and are welded together along the surface 38.
  • the joining together can be made advantageously similar to that of Fig. 2 and both points 39 and 40 are connected to one pole and points 4
  • This type of cathode construction has very great strength.
  • the cathode disclosed in Fig. 6 also offers the possibility of varying the necessary filament voltage by alternately parallel connection of points 39, 40, 4
  • or 49 and 42 can be connected parallel or points 39 and 42 to one pole and points 40 and 4
  • the ratio previously mentioned of the sides and diagonals is changed by the last arrangement because the diagonal surfaces 36 and 31 do not contact one another in the center but have the bridge 38.
  • the cloth of metal wires is used as a support for the oxide layer because oxide adheres to such a mesh cloth better than on smooth or roughened metal surfaces. It is possible, however, to use solid metal or sheet bands instead of a mesh cloth. In this case, the preferred selection of resistances of the various parts of the cathode is accomplished by choice of different materials or different thicknesses for the bands forming the support for the individual surface parts.
  • a metal conductive portion for an oxide coated cathode comprising a band-shaped mesh forming the fiat sides of a prism and bandshaped mesh members extending from the corners of said prism towards the center thereof, the mesh of said fiat sides of the prism bein different from the mesh of the members extend ing from the corners of said prismtowards the center.
  • a cathode comprising a mesh ribbon forming the lateral surface of an enclosing geometrical figure and mesh ribbon in the interior of said geometrical figure connected to the lateral surface thereof, the interior ribbon being of different mesh than the mesh of the lateral surface.

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  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
US254653A 1938-02-04 1939-02-04 Oxide cathode Expired - Lifetime US2222021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2222021X 1938-02-04

Publications (1)

Publication Number Publication Date
US2222021A true US2222021A (en) 1940-11-19

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ID=7990876

Family Applications (1)

Application Number Title Priority Date Filing Date
US254653A Expired - Lifetime US2222021A (en) 1938-02-04 1939-02-04 Oxide cathode

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US (1) US2222021A (en, 2012)
NL (1) NL52447C (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426255A (en) * 1945-08-30 1947-08-26 Standard Telephones Cables Ltd Cathode for electron discharge devices
US2532838A (en) * 1947-08-15 1950-12-05 Hartford Nat Bank & Trust Co Electric discharge tube comprising an indirectly heated cathode
US3995188A (en) * 1974-06-28 1976-11-30 Thomson-Csf Grid for an electronic tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426255A (en) * 1945-08-30 1947-08-26 Standard Telephones Cables Ltd Cathode for electron discharge devices
US2532838A (en) * 1947-08-15 1950-12-05 Hartford Nat Bank & Trust Co Electric discharge tube comprising an indirectly heated cathode
US3995188A (en) * 1974-06-28 1976-11-30 Thomson-Csf Grid for an electronic tube

Also Published As

Publication number Publication date
NL52447C (en, 2012)

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