US3758810A - Electric discharge tube comprising a rod grid - Google Patents

Electric discharge tube comprising a rod grid Download PDF

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Publication number
US3758810A
US3758810A US00199882A US3758810DA US3758810A US 3758810 A US3758810 A US 3758810A US 00199882 A US00199882 A US 00199882A US 3758810D A US3758810D A US 3758810DA US 3758810 A US3758810 A US 3758810A
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US
United States
Prior art keywords
cylinder
slots
rods
electric discharge
discharge tube
Prior art date
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
Application number
US00199882A
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English (en)
Inventor
H Seifert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3758810A publication Critical patent/US3758810A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/38—Control electrodes, e.g. grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0015—Non-sealed electrodes
    • H01J2893/0017—Cylindrical, helical or annular grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture

Definitions

  • ABSTRACT A metal-ceramic tetrode or triode which comprises a cylindrical rod grid which is manufactured by means of a spark erosion process. In order to improve the mechanical stability of the grid and also to shift the resonant frequency to higher frequencies, the grid comprises wide and narrow rods.
  • the slots Since the wide rods bend inwardly or outwardly during the spark erosion process, the slots, to avoid said drawback,adjoining the wide rods extend in at least one inwardly extending flange of the cylinder farther in the direction normal to the curved surface of the cylinder than the slots present between the thin rods.
  • the invention relates to an electric discharge tube which comprises one or more electrodes, each consisting of a hollow metal cylinder in which slots are provided by means of a spark erosion process, said slots extending in the axial direction and in at least one inwardly extending flange of the cylinder also in a direction normal to the curved surface of the cylinder.
  • Such electrodes are known from the United States Pat. No. 2,980,984 and 3,146,515.
  • the spark erosion process is comparatively cheap while nevertheless high requirements as regards the tolerances can be fulfilled.
  • the electrode according to the invention comprises, in addition to the thin rods of approximately equal cross-section obtained by a spark erosion process, a few wider rods which serve as supports and the adjacent slots of which in at least one inwardly extending flange of the cylinder extend farther in the direction normal to the curved surface of the cylinder than the slots present between the thin rods.
  • the electrode according to the invention is preferably used as a control electrode in a metal-ceramic tetrode or triode.
  • the shape of said control electrode preferably is circular cylindrical which does not mean that the application of the invention is restricted to said shape.
  • the invention may equally successfully be used, for example, in a rectangular cylinder in which the grid, as is usual in many tubes, is formed in one or more side faces. It is not important either from what metal the hollow cylinder is manufactured. This may be, for example, copper, molybdenum or steel.
  • FIG. 1 shows a grid for an electric discharge tube which comprises only a few wider supports, only one of which is shown;
  • FIG. 2 shows an embodiment of a grid according to the invention.
  • the hollow cylinder 1 is constructed as a circular cylinder.
  • the slots 2 are formed by means of a spark erosion process which slots, terminate at the circular plane 4 and, as denoted by 5, extend in the radial direction.
  • the rods 6 and the supports 7 are formed.
  • the rods 6 are slightly plastically deformed, i.e., buckled, by thermal expansion, as a result of which the support 7 is loaded for buckling and, as denoted by 8, bends slightly outwards.
  • the distance to the nearest electrode thus has become'smaller as a result of which electric flash-over will occur at 8 and the tube would be useful at a considerably lower voltage, which has for its result that the required specifications are no loner fulfilled.
  • the hollow cylinder 11 which has a wall thickness of approximately 0.1 mm, is constructed as a circular cylinder.
  • slots are provided by means of a spark erosion process, which slots terminate at the circular plane 14 and,
  • the rods 16 and supports 17 are formed which have a width of approximately 0.1 mm and 1 mm, respectively.
  • the slots 18 and 19 adjoining the supports 17 extend in the circular plane 14 in the radial direction farther than the slots 12 present between the rods 16.
  • the comparatively larger elongation of the supports 17 relative to the rods 16 is compensated for in the circular plane I4 at 10 in that the material can easily be bent in the axial direction at that area as a result of the deeper slots 18 and 19.
  • the deformation of the material at that area lies outside the electric discharge space of the tube and therefore has no influence on the electric properties of the tube.
  • the mechanical stability of the grid is amply sufficient in spite of the deeper slots 18 and 19.
  • an electric discharge tube of the type having at least one electrode consisting of a hollow metal cylinder in which slots are provided by means of a spark erosion process, said slots extending in the axial direction and in at least one inwardly extending flange of the cylinder also in a direction normal to the curved surface of the cylinder as a result of which a grid is formed which is constructed from thin rods of approximately the same cross-section, the improvement comprising that in addition to the thin rods, the electrode comprises a few wider rods which are bounded on either side by two slots which extend farther in the direction normal to the curved surface of the cylinder than the wherein said tube is a metalceramic triode.

Landscapes

  • Discharge Lamp (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Spark Plugs (AREA)
  • Microwave Tubes (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US00199882A 1970-11-21 1971-11-18 Electric discharge tube comprising a rod grid Expired - Lifetime US3758810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2057331A DE2057331C3 (de) 1970-11-21 1970-11-21 Elektrode für eine Elektronenröhre

Publications (1)

Publication Number Publication Date
US3758810A true US3758810A (en) 1973-09-11

Family

ID=5788772

Family Applications (1)

Application Number Title Priority Date Filing Date
US00199882A Expired - Lifetime US3758810A (en) 1970-11-21 1971-11-18 Electric discharge tube comprising a rod grid

Country Status (4)

Country Link
US (1) US3758810A (Direct)
DE (1) DE2057331C3 (Direct)
FR (1) FR2115906A5 (Direct)
GB (1) GB1360662A (Direct)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040255784A1 (en) * 2001-11-30 2004-12-23 Harry Johansson Discharge electrode

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696103A (en) * 1921-08-26 1928-12-18 Seibt Georg Electric discharge tube
US2157595A (en) * 1937-02-25 1939-05-09 John F Cudney Thermionic vacuum tube
US2980984A (en) * 1957-08-19 1961-04-25 Rca Corp Art of fabricating electron tubes
US3146515A (en) * 1962-10-16 1964-09-01 Rca Corp Method of making an electron tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696103A (en) * 1921-08-26 1928-12-18 Seibt Georg Electric discharge tube
US2157595A (en) * 1937-02-25 1939-05-09 John F Cudney Thermionic vacuum tube
US2980984A (en) * 1957-08-19 1961-04-25 Rca Corp Art of fabricating electron tubes
US3146515A (en) * 1962-10-16 1964-09-01 Rca Corp Method of making an electron tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040255784A1 (en) * 2001-11-30 2004-12-23 Harry Johansson Discharge electrode
US7298075B2 (en) * 2001-11-30 2007-11-20 Bact System I Skelleftea Ab Discharge electrode for use in an electrostatic precipitator and method of manufacturing the same

Also Published As

Publication number Publication date
GB1360662A (en) 1974-07-17
FR2115906A5 (Direct) 1972-07-07
DE2057331B2 (de) 1974-01-10
DE2057331A1 (de) 1972-05-31
DE2057331C3 (de) 1974-08-08

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