US1906037A - Electrode in discharge tubes - Google Patents

Electrode in discharge tubes Download PDF

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Publication number
US1906037A
US1906037A US79590A US7959026A US1906037A US 1906037 A US1906037 A US 1906037A US 79590 A US79590 A US 79590A US 7959026 A US7959026 A US 7959026A US 1906037 A US1906037 A US 1906037A
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US
United States
Prior art keywords
tube
magnesium
wall
electrode
discharge
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
US79590A
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English (en)
Inventor
Zecher Gustav
Bruijnes Johannes
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General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US1906037A publication Critical patent/US1906037A/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
    • 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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel

Definitions

  • the life of these electrodes is very short because they soon disintegrate if the current density at the surface of the electrodes is not Besides, in gasfilled discharge tubes the disintegrating magnesium absorbs not only the lIljIlIlOllS ingredients but also the gaseous filling itself, so that the pressure of the gas gradually decreases.
  • the invention has for its ob'ect the manufacture of magnesium electrodes which do not have the said disadvantages and it can more particularly be applied to gasfilled j tubes in which the glowing effect is produced by the positive column.
  • the discliar e e comprises one or more bodies whlch su tub stantially consist of magnesium and which during or after the exhaustion of the tube are heated to'such an extent that the magnesium voltalizes or disintegrates and de- Egsits on the wall of thetube in the neighurhood of one or more conductors serving to lead the current through the wall of the tube and in conductive connection with the said conductors.
  • the body may be heated in diflerent ways.
  • the body may be heated in diflerent ways.
  • the magnesium body should preferably be fixed on a rod of any material susceptible of being readily deprived of occluded gases
  • the rod for example as iron, said rod being sevolatilization' of'the ma esium this red is then already sufliciently fe prived of occluded gases.
  • the layer deposited on the a wall may be chosen such that during the opinvention is already eration of the tube the rod does not contribute to the discharge and consequently neither is heated to a high temperature.
  • the discharge tube comprising one or more electrodes constituted in accordance with the process of the invention, offers the advantage that it has a long life since owing to the large surface of the electrode the temperature of the latter is not raised very much so that the material deposited on the wall disintegrates or volatilizes only in a slight meas- Besides, any ingredients injurious to the discharge and present in the tube, are absorbed while the layer acting as an electrode is being applied and during the operation of the tube and the operatin voltage and the starting voltage of the tu e are materially smaller than is the case with the usual electrodes.
  • the wall of the tube in the neighbourhood of the leading-in conductors is given such a shape that the magnesium which has deposited on the wall and which disintegrates or volatilizes during the operation of the tube, substantially deposits again on the wall portion coated already with magnesium. Owing to this the volatilization of magnesium which with the electrodes according to the small, does not exercise any detrimental influence on the life of the tube as the layer once produced remains intact.
  • the wall of the tube in the neighbourhood of the leading-in conductors should preferably be made substantially spherical.
  • the tube near the portion acting as an electrode may be kinked.
  • Figure 1 represents a discharge tube in which the glowing effect is produced by the positive column, said tube comprising electrodes constituted in accordance with the process of the invention and Figure 2 shows a detail of one of the electrodes in such'a' tube.
  • the numeral 1 refers to a glass tube which at both sides is kinked and which is provided with spherical ends 2.
  • each end 2 is sealed a leading-in wire 3, for example, of platinum or of any other material allowing of being readily sealed in glass,
  • a mica screen 6 may be 4 inorder to limit the deposition of magnesium as much as possible to the wall of the sphere 2.
  • a portion of the leading-in wire 3 as well as the glass wall in the nearest proximity of this wire is coated with a layer 7 of conductive material.
  • a layer 7 of conductive material Preferably an emulsion of graphite in water should be used for this purpose.
  • the ends 2 are then sealed to the tube 1, whereupon the tube is exhausted in the known manner and is provided with a gaseous filling for which purpose frequently neon under a pressure of some millimetres of mercury is used.
  • a coil (not shewn in the drawing) is arranged around each end 2, in which coil a high frequency magnetic field of such intensity is excited that the magnesium helix 5 volatilizes and on the wall of the tube a magnesium layer 8 is formed which also covers the conductive layer 7
  • the discharge tube is ready for use and may be connected to some source of potential which in the drawing is diagrammatically winding 9 of a transformer.
  • the latter is not heated during the operation of the tube to a high temperature so that the magnesium layer only slightly volatilizes.
  • the end 2 of the tube has such a shape that any distintegrating or volatilizing magnesium particles substantially strike on portions of the tube which are already coated with magnesium.
  • the wall of the tube in the neighbourhood of the electrode being substantially spherical so that the magnesium which has deposited on the wall and which volatilizes during the operation of the tube substantially deposits again on the spherical part of the wall of the tube.
  • the Wall of the tube in theeneighbourhood of the electrode being substantially spherical so that the magnesium which has deposited on the wall and which volatilizes during the operation of the tube substantially deposits again on the spherical part of the wall of the tube.
  • a positive column discharge device comprising an envelope having a tubular portion with electrode chambers-of greater diameter than. said tubular portion at each end thereof, a lead-in member sealed into each electrode chamber and a metallic coating covering the inner wall of each electrode chamber, contacting with its respective lead-in member, and bounded by the junction of. the electrode chamber and tubular portion.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Lasers (AREA)
US79590A 1925-03-28 1926-01-06 Electrode in discharge tubes Expired - Lifetime US1906037A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL249847X 1925-03-28

Publications (1)

Publication Number Publication Date
US1906037A true US1906037A (en) 1933-04-25

Family

ID=19781028

Family Applications (1)

Application Number Title Priority Date Filing Date
US79590A Expired - Lifetime US1906037A (en) 1925-03-28 1926-01-06 Electrode in discharge tubes

Country Status (5)

Country Link
US (1) US1906037A (enrdf_load_stackoverflow)
DE (1) DE529985C (enrdf_load_stackoverflow)
FR (1) FR609190A (enrdf_load_stackoverflow)
GB (1) GB249847A (enrdf_load_stackoverflow)
NL (1) NL23558C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432051A (en) * 1944-05-19 1947-12-02 Vang Alfred Mercury tube and circuit therefor
US2680826A (en) * 1948-05-01 1954-06-08 Sylvania Electric Prod Stabilized klystron
CN110112411A (zh) * 2019-04-23 2019-08-09 上海应用技术大学 一种MnCO3微球及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754656C (de) * 1937-11-12 1952-07-07 Stabilovolt G M B H Glimmentladungsroehre zur Gleichspannungsregelung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432051A (en) * 1944-05-19 1947-12-02 Vang Alfred Mercury tube and circuit therefor
US2680826A (en) * 1948-05-01 1954-06-08 Sylvania Electric Prod Stabilized klystron
CN110112411A (zh) * 2019-04-23 2019-08-09 上海应用技术大学 一种MnCO3微球及其制备方法

Also Published As

Publication number Publication date
GB249847A (en) 1927-01-20
DE529985C (de) 1931-07-23
NL23558C (enrdf_load_stackoverflow)
FR609190A (fr) 1926-08-10

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