US3504213A - Nonemissive carbide elements for grids for power tubes - Google Patents

Nonemissive carbide elements for grids for power tubes Download PDF

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Publication number
US3504213A
US3504213A US609649A US3504213DA US3504213A US 3504213 A US3504213 A US 3504213A US 609649 A US609649 A US 609649A US 3504213D A US3504213D A US 3504213DA US 3504213 A US3504213 A US 3504213A
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US
United States
Prior art keywords
grid
grids
rods
nonemissive
power tubes
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US609649A
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English (en)
Inventor
Petr Hix
Petr Schneider
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Tesla AS
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Tesla AS
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Publication date
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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
    • H01J1/46—Control electrodes, e.g. grid; Auxiliary electrodes
    • H01J1/48—Control electrodes, e.g. grid; Auxiliary electrodes characterised by the material

Definitions

  • graphite is combined with other materials having similar properties as graphite to strengthen the grid construction. It is of primary importance to increase the strength of the various active elements of which the grid is made up.
  • the invention also relates to the form of the active elements or members of the grid, and means for holding these active members in their position in the grid structure to achieve a cage-type grid.
  • This invention is characterized by the feature that its active portion consists of individual members consisting of a non-metallic material with electric and thermal conductivity.
  • a suitable non-metallic material for use in the invention is a carbide of a metal of the Group IV, Vb 0r VIb of the periodic system of elements with carbon bound in the carbide and an excess of graphite not bound therein. This excess lies between 0.3 and 40% of the weight of the carbon bound in the carbide.
  • Particularly suitable are carbides of molybdenum or tungsten.
  • the active portion of the grid consists of members made from the mentioned non-metallic material, for example in the form of rods of circular or rectangular cross-section elongated parallel to the axis of the cathode and circumferentially spaced about the same. If the rods are of rectangular cross-section, the narrower side faces the cathode. A tubular grid body is created in both cases.
  • the carrier system of the non-active portion is made in any known manner.
  • FIG. 1 shows a grid of the invention for an otherwise conventional power tube, not shown; and
  • FIG. 2 shows a modified grid both figures being fragmentary perspective views.
  • Twelve cylindrical rod 1 in FIG. 1 form a cylindrical grid surrounding a non-illustrated cathode and interposed between the cathode and a non-illustrated anode.
  • These rods are conductively connected in parallel alignment and in spaced circumferential relationship between two, coaxial, circularly annular holders 2, 3 of metal, metallized ceramic, or carbon containing material, having a rectangular cross-section.
  • the spacing of the rods 1 is selected in accordance with the required .grid transparency of the tube, not otherwise shown. If a small transparency is required, rods 5 shown in FIG. 2. and having a rectangular cross-section may be used, and their smaller side faces the cathode in the axis of the tube.
  • the individual rods are soldered together with suitably profiled metal sleeves.
  • the grid surface subjected to bombardment by electrons is smaller than in the grid of FIG. 1, but the total radiating surface of the grid is substantially increased.
  • the grid may be assembled, for example, in the following manner: One end of each rod 1 is covered with rhodium, gold or nickel by galvanic deposition. The metallized rods are then inserted first in blind openings or a groove of one of the holders 2, 3. The distance between the openings determines the density of the grid. The assembled holder and rods 1 are heated in a vacuum or hydrogen oven until the metallized ends of the rods 1 are soldered to the metal of the holder. Then the free second ends of the rods 1 are also provided with a metal layer and are soldered to the second holder. The grid may of course also be completed by a single soldering step.
  • the non-metallic grids In comparison with metallic grids, the non-metallic grids have the advantage that the admissible grid dissipation is at least three times larger.
  • a grid for an electron tube comprising:
  • each of said elements consisting throughout of a carbide of a metal from Group IVb, Vb, or
  • said metal being tungsten or molybdenum.

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  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Solid Thermionic Cathode (AREA)
  • Hybrid Cells (AREA)
US609649A 1966-08-17 1967-01-16 Nonemissive carbide elements for grids for power tubes Expired - Lifetime US3504213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS540366 1966-08-17

Publications (1)

Publication Number Publication Date
US3504213A true US3504213A (en) 1970-03-31

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ID=5398870

Family Applications (1)

Application Number Title Priority Date Filing Date
US609649A Expired - Lifetime US3504213A (en) 1966-08-17 1967-01-16 Nonemissive carbide elements for grids for power tubes

Country Status (6)

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US (1) US3504213A (de)
CH (1) CH452065A (de)
DE (1) DE1614755A1 (de)
FR (1) FR1512848A (de)
GB (1) GB1169456A (de)
NL (1) NL6700510A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688150A (en) * 1965-06-30 1972-08-29 Siemens Ag Degassing arrangement for electron beam tube including an mk dispenser cathode
US3902094A (en) * 1972-11-13 1975-08-26 Varian Associates Vane grid structures and method of making same
US3906285A (en) * 1973-05-15 1975-09-16 Nippon Electric Kagoshima Ltd Luminescent display tube anode assembly comprising anode segments each having a tungsten carbide conductive layer
US4263528A (en) * 1978-05-03 1981-04-21 Varian Associates, Inc. Grid coating for thermionic electron emission suppression

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241565A (en) * 1940-05-31 1941-05-13 Rca Corp Grid electrode
US2305478A (en) * 1940-08-02 1942-12-15 Bell Telephone Labor Inc Method of carbonizing electrodes
US2348045A (en) * 1942-01-01 1944-05-02 Bell Telephone Labor Inc Electron discharge device and method of manufacture
US2361203A (en) * 1942-01-01 1944-10-24 Bell Telephone Labor Inc Electron discharge device and method of manufacture
US2401040A (en) * 1942-10-05 1946-05-28 Eitel Mccullough Inc Method of making electronic tubes
US2497111A (en) * 1947-07-25 1950-02-14 Eitel Mccullough Inc Electron tube having carburized thoriated cathode
US2513241A (en) * 1943-03-10 1950-06-27 Hartford Nat Bank & Trust Co Nonemitting electrode for electric discharge tubes
US2513387A (en) * 1947-08-26 1950-07-04 Standard Telephones Cables Ltd Grid electrode
US2821496A (en) * 1951-08-03 1958-01-28 Gen Electric Non-emissive grids
US3389285A (en) * 1964-09-08 1968-06-18 Int Standard Electric Corp Grid electrode having a barrier layer of metal carbide and a surface coating of metal boride thereon
US3418511A (en) * 1965-05-28 1968-12-24 Bbc Brown Boveri & Cie Mercury arc rectifier with multiple grid structure

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241565A (en) * 1940-05-31 1941-05-13 Rca Corp Grid electrode
US2305478A (en) * 1940-08-02 1942-12-15 Bell Telephone Labor Inc Method of carbonizing electrodes
US2348045A (en) * 1942-01-01 1944-05-02 Bell Telephone Labor Inc Electron discharge device and method of manufacture
US2361203A (en) * 1942-01-01 1944-10-24 Bell Telephone Labor Inc Electron discharge device and method of manufacture
US2401040A (en) * 1942-10-05 1946-05-28 Eitel Mccullough Inc Method of making electronic tubes
US2513241A (en) * 1943-03-10 1950-06-27 Hartford Nat Bank & Trust Co Nonemitting electrode for electric discharge tubes
US2497111A (en) * 1947-07-25 1950-02-14 Eitel Mccullough Inc Electron tube having carburized thoriated cathode
US2513387A (en) * 1947-08-26 1950-07-04 Standard Telephones Cables Ltd Grid electrode
US2821496A (en) * 1951-08-03 1958-01-28 Gen Electric Non-emissive grids
US3389285A (en) * 1964-09-08 1968-06-18 Int Standard Electric Corp Grid electrode having a barrier layer of metal carbide and a surface coating of metal boride thereon
US3418511A (en) * 1965-05-28 1968-12-24 Bbc Brown Boveri & Cie Mercury arc rectifier with multiple grid structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688150A (en) * 1965-06-30 1972-08-29 Siemens Ag Degassing arrangement for electron beam tube including an mk dispenser cathode
US3902094A (en) * 1972-11-13 1975-08-26 Varian Associates Vane grid structures and method of making same
US3906285A (en) * 1973-05-15 1975-09-16 Nippon Electric Kagoshima Ltd Luminescent display tube anode assembly comprising anode segments each having a tungsten carbide conductive layer
US4263528A (en) * 1978-05-03 1981-04-21 Varian Associates, Inc. Grid coating for thermionic electron emission suppression

Also Published As

Publication number Publication date
CH452065A (de) 1968-05-31
NL6700510A (de) 1968-02-19
GB1169456A (en) 1969-11-05
FR1512848A (fr) 1968-02-09
DE1614755A1 (de) 1971-02-11

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