US1875744A - Arrangement for dispensing badly conductive substances in vacuum valves - Google Patents

Arrangement for dispensing badly conductive substances in vacuum valves Download PDF

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Publication number
US1875744A
US1875744A US365340A US36534029A US1875744A US 1875744 A US1875744 A US 1875744A US 365340 A US365340 A US 365340A US 36534029 A US36534029 A US 36534029A US 1875744 A US1875744 A US 1875744A
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United States
Prior art keywords
anode
arrangement
substances
dispensing
vacuum valves
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Expired - Lifetime
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US365340A
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English (en)
Inventor
Loewe Bernhard
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/39—Degassing vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H01J7/186—Getter supports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Definitions

  • the invention relates to an arrangement for dispersing substances in vacuum Valves.
  • the device according. to my invention differs from other known devices where the substances to be dispersed are arranged, for instance, on an auxiliary wire which, prior to the manufacture of the valve,
  • getter substances such as mag nesium within the valve by eddy current heating.
  • non -conductive or electrolytic substances are to be evaporated or even only heated. This process may not be applied 0 because in badlvconductive substances eddy currents cannotbe induced to a noteworthy If, however. salts or other badly conducsuitable frequency is allowed to act upon the valve from the outside. As close as possible to these points to be heated with particular intensity the substance to be heated may, ac cording to my invention, be arranged. If, more particularly, the substance to be heatedis non-conductive,it may be arranged in such.
  • the anode is provided with two slots forthe substance to be dispersed at the side of the place of attachment and the point of attachment 80.
  • the slots 2 in the anode may from the outside across the glass jar or the electrode system and whose axis is coincident with the axis of the cylindrical anode, the induced eddy current lines run at the cylindrical jacket of anode 1 essentially in circles which, however, on account of the slots 2 are greatly compressed on bridge 3 and a particularly strong heating,such as described,
  • the element or body 4 is attached onthe bridge on the inner surface ofthe anode and may consist of a reactivecompound according to my invention described in application No.-
  • the effect to be produced bythe heat is the dispersal of the substance 4 for purposes of form-v ing .a highly emissive layer. on the cathode 6.
  • the electrode system according to Fig. 1 is;
  • the slots mayadditionally be covered by non-conductive material; it is possible, for instance, ,in the manner indicated in the figure to make them as wide as a mica-sheet is thick and to insert one or several mica plates, into the slots 2.
  • Fig. 2 shows a further embodiment of my invention where an element of conductive material is to be heated. In this case it will not be advisable to arrange the lozenge 4 immediately on the bridge 3 of the anode.
  • the bridge may be made particularly narrow in order to effect a very strong heating, and the substance to be heated and which may be badly, yet noticeably conductive may be arranged outside the anode across bridge 3, thus being without conductive connection with the anode and being heated merely by heat radiation from bridge 3.
  • the element 4 may be made very be a piece ofmagnesium.
  • getter substance 4 For the dispersal of getter substances an embodiment like that on Fig. 3 is particularly appropriate. By giving the getter substance 4 proper dimensions and by arranging it at a correct distance from anode 2 we may produce the result that in the manufacture of the V valve the dispersal of the magnesium takes place only after the outgassing of the metal elements.
  • Fig. 1 Whilst the arrangement according to my 1nvention as shown .in Fig. 2 is preferred for the dispersal of a getter substance, the arrangement according to Fig. 1 is suitable in the firstplace for-the production of a high emission cathode.
  • - W hatsoever may be the embodiment of my invention, the fundamental principleof it is always, to determine the distribution of eddy current lines in a metal conductor by a ce'r tain shape in such a way that at one or several places the temperature produced by the eddy currents is higher than that at other places.
  • a vacuum tube comprising an electrode system consisting of a cathode, a grid and a cylindrical anode, lead-in wires for the'system, an eddy current arrangement outside the tube consisting of a high frequency current coil for heating the anodeat a destined place to a higher'te'mperature than atneighbouring places the anode being slit along a line across said place and non-conductive substances arranged at said place these non-conductive substances being scattered.
  • a vacuum tube comprising an electrode system consisting of a cathode, a grid and a cylindrical anode, lead-in wires for the sys: tem, an eddy current arrangement outside the; tube consisting of a high frequency'current coil for heating the anode at a destined place to a higher temperature than at neighbouring 7 places the anode being slit along aline across said place and a reaction mixture arranged at said place this reaction mixture being scat tered and precipitated at the surface of the cathode as a highly emissive layer;
  • a vacuum tube comprising an electrode system consisting of a cathode, a grid and a cylindrical anode, lead-in wires for the sys-' tem, an eddy current arrangement outside the tube consisting of a high frequency current coil for heating the anode, a lozenge of barium oxide and silicon attached to the inner surface of the anode in the middle of a shell line, the anode being slitfrom both ends along said shell line.
  • a Vacuum tube comprising an electrode system consisting of a cathode, a grid and a cylindrical anode, lead-in Wires for the sys tem, an eddy current arrangement outside the tube consisting of a high frequency current coil for heating the anode, a lozenge of barium oxide and silicon attached to theinner surface of the anode in the middle of a shell line, the anode being slit from both ends along said shell line, and mica sheets inserted in these slots of the anode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US365340A 1928-05-12 1929-05-23 Arrangement for dispensing badly conductive substances in vacuum valves Expired - Lifetime US1875744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE311654X 1928-05-12

Publications (1)

Publication Number Publication Date
US1875744A true US1875744A (en) 1932-09-06

Family

ID=6130851

Family Applications (1)

Application Number Title Priority Date Filing Date
US365340A Expired - Lifetime US1875744A (en) 1928-05-12 1929-05-23 Arrangement for dispensing badly conductive substances in vacuum valves

Country Status (4)

Country Link
US (1) US1875744A (de)
FR (1) FR674931A (de)
GB (1) GB311654A (de)
NL (1) NL29687C (de)

Also Published As

Publication number Publication date
FR674931A (fr) 1930-02-04
GB311654A (en) 1930-09-15
NL29687C (de)

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