US3246198A - Grid electrode for electrical discharge tubes - Google Patents

Grid electrode for electrical discharge tubes Download PDF

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Publication number
US3246198A
US3246198A US205313A US20531362A US3246198A US 3246198 A US3246198 A US 3246198A US 205313 A US205313 A US 205313A US 20531362 A US20531362 A US 20531362A US 3246198 A US3246198 A US 3246198A
Authority
US
United States
Prior art keywords
cross
grid
rods
bar members
grid wire
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
US205313A
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English (en)
Inventor
Dulk Ernst Sigmund Den
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
North American Philips Co Inc
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 US3246198A publication Critical patent/US3246198A/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
    • H01J2893/0016—Planar 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
    • H01J2893/0025—Manufacture by winding wire upon a support

Definitions

  • the invention relates to a grid electrode for electric discharge tubes, which electrode is manufactured according to the method described in Netherlands patent specification 89,848, and which consists of a frame constituted by two supporting rods on which a grid wire is tautly wound, and two cross bars having in general a rectangular cross-section and being provided in the proximity of the ends of the grid electrode, while on each grid end at least one of the cross bars is welded on one of the supporting rods at some distance from its end, so that it has a part which projects outside the frame.
  • Both the supporting rods and the cross bars and the grid wire c sist of molybdenum.
  • the grid wire is connected to the supporting rods with a vitreous cement or by means of a welded rod provided across the grid wire.
  • this connection of the grid wire is somewhat complicated.
  • the supporting rods consist of nickel, while the ends of the grid wire are clamped by bending the projecting ends of the cross bars consisting of molybdenum about the supporting rods after winding the grid wire.
  • FIG. 1 is a continuously wound grid before the grids are separated
  • FIG. 2 shows the end of a grid according to the invention
  • FIG. 3 is a plan view of such a grid.
  • FIG. 4 is a plan view of another embodiment and FIGS. 5 and 6 are a front view and a plan view respectively of still another embodiment according to the invention.
  • cross rods 2 which in this case extend about one of the supporting rods 1 and the .free ends 3 of which are welded on the other supporting rod 1 at some distance from the end indicated by a cross.
  • both the rods 1 and the cross rods 2 consisted of molybdenum.
  • the grid wire 4 is wound across the rod 1 and hooked behind a projecting end 3 of a cross rod 2 at the end of a grid and conducted to the beginning of the following grid via the rod 2, so that the portion between the grids has no turns which would have to be removed afterwards.
  • the grid wire 4 is provided on the supporting rods 1 between the grids by means of glass or by welding-on a strip.
  • the grids are separated by cutting the rods between two grids.
  • the rods 1 consist of nickel and it now appears possible to bend the ends 3 of the molybdenum cross bars 2 about the rods 1, so that the grid wire 4 is clamped (FIGS. 2 and 3) without these ends breaking off.
  • the end of the grid wire is indicated b 5.
  • a suitable cross profile 8 will have to be used in many cases, as indicated, for example, in FIG. 4, in order to obtain a sufficient rigidity in a direction parallel to the grid wires 4.
  • FIG. 4 separate cross bars 6 are provided.
  • One end 7 clamps the wire end 5.
  • the other end 7 is preferably bent also, as indicated by an arrow.
  • the flat sides of the supporting rods 8 have the advantage that they facilitate the welding of the cross rods 6 and cause a certain damping of the grid wires because these wires shift along the fiat face when vibrating, so that the microphonic effect of the grids is decreased.
  • the use of such profiled supporting rods was already known.
  • the invention is also particularly suitable for the case known per se .in which two grids are wound across each other. Across the wires 4, a second grid 9 is wound in the case of FIGS. 5 and 6, which grid has .a pitch, for example, which corresponds to that of a screen grid of the electrode system. Then the wires 9 may shadow the wires of the positive screen grid in order to decrease the screen grid current without it being necessary for this screen grid to have a pitch which is as small as that of the grid 5 which is formed by the wire 4, or conversely.
  • the four ends 5 and 10 respectively may then each be clamped behind a separate projection 3 or 7 so that it is not necessary to clamp two ends of a wire under one projection.
  • a grid electrode for an electric discharge tube comprising a pair of spaced support rods, a pair of molybdenum cross-bar members placed cross-wise in spaced relationship over the stay-rods, a grid wire helically and tautly wound over the stay-rods between the cross-bar members, the ends of said grid wire passing and being clamped between the ends of the cross-bar members and the stayrods, the ends of said cross-bar members being bent around the support rods to firmly secure the ends of the grid wire.
  • a grid electrode for an electric discharge tube comprising a pair of spaced support rods, a pair of molybdenum cross-bar members placed cross-wise in spaced relationship over the stay-rods, a grid wire helically and tautly wound over the stay-rods between the cross-bar members, the ends of said grid wire passing between the ends of the cross-bar members and the stay-rods, the ends of said cross-bar members being bent around the support rods to firmly secure the ends of the grid wires, the support rods ends of the cross-bar mernbers are bent about the stayrods.
  • a grid electrode for an electric discharge tube comprising a pair of spaced nickel support rods, a pair-of molybdenum cross-bar members placed cross-wise in spaced relationship over the stay-rods, a grid wire helically and tautly wound over'the stay-rods between the cross bar members, the ends of said grid wire passing between the ends of the cross-bar members and the stay-rods, the ends of said cross-bar members being bent around and en: gaging the support rods to firmly secure the ends of the grid wire; the support rods having a cross-section which v 4 t resists 'de'formatioh'when theends of the crossbar members are bent around the stay-rods.

Landscapes

  • Wire Processing (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
US205313A 1961-07-20 1962-06-26 Grid electrode for electrical discharge tubes Expired - Lifetime US3246198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL267331 1961-07-20

Publications (1)

Publication Number Publication Date
US3246198A true US3246198A (en) 1966-04-12

Family

ID=19753175

Family Applications (1)

Application Number Title Priority Date Filing Date
US205313A Expired - Lifetime US3246198A (en) 1961-07-20 1962-06-26 Grid electrode for electrical discharge tubes

Country Status (7)

Country Link
US (1) US3246198A (da)
CH (1) CH406448A (da)
DE (1) DE1875629U (da)
DK (1) DK103247C (da)
ES (1) ES279307A1 (da)
GB (1) GB950250A (da)
NL (1) NL267331A (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050220957A1 (en) * 2004-03-30 2005-10-06 Unilever Bestfoods, North America Tomato process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1792219A (en) * 1926-02-27 1931-02-10 Siemens Ag Method of securing grid wires
DE1041605B (de) * 1956-05-25 1958-10-23 Siemens Ag Spanngitter, dessen Gitterdraehte auf Holmen befestigt sind
DE1113036B (de) * 1960-05-10 1961-08-24 Telefunken Patent Verfahren zum Befestigen der Wickeldrahtenden eines Spanngitters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1792219A (en) * 1926-02-27 1931-02-10 Siemens Ag Method of securing grid wires
DE1041605B (de) * 1956-05-25 1958-10-23 Siemens Ag Spanngitter, dessen Gitterdraehte auf Holmen befestigt sind
DE1113036B (de) * 1960-05-10 1961-08-24 Telefunken Patent Verfahren zum Befestigen der Wickeldrahtenden eines Spanngitters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050220957A1 (en) * 2004-03-30 2005-10-06 Unilever Bestfoods, North America Tomato process

Also Published As

Publication number Publication date
GB950250A (en) 1964-02-26
ES279307A1 (es) 1962-11-16
DK103247C (da) 1965-12-06
CH406448A (de) 1966-01-31
NL267331A (da)
DE1875629U (de) 1963-07-18

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