US3771205A - Method of manufacturing a multiple-electrode discharge tube - Google Patents

Method of manufacturing a multiple-electrode discharge tube Download PDF

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Publication number
US3771205A
US3771205A US00211917A US3771205DA US3771205A US 3771205 A US3771205 A US 3771205A US 00211917 A US00211917 A US 00211917A US 3771205D A US3771205D A US 3771205DA US 3771205 A US3771205 A US 3771205A
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US
United States
Prior art keywords
electrode
envelope
electrodes
electrode members
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
US00211917A
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English (en)
Inventor
S Furuta
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.)
Sankosha Co Ltd
Original Assignee
Sankosha Co Ltd
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 Sankosha Co Ltd filed Critical Sankosha Co Ltd
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Publication of US3771205A publication Critical patent/US3771205A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/50—Spacing members extending to the envelope
    • 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
    • H01J2893/0002—Construction arrangements of electrode systems
    • H01J2893/0005—Fixing of electrodes
    • H01J2893/0008—Supply leads; Electrode supports via rigid connection to vessel

Definitions

  • the invention relates to a multiple-electrode discharge tube of the layer-built type, and in particular, to such discharge tube having more than two electrodes in which an intermediate electrode is a disc'electrode having a diameter greater than either the upper or lower electrode.
  • the invention also relates to a method of manufacturing such discharge tube.
  • Prior art multiple-electrode discharge tube of the kind described have been fabricated by fusing the electrodes to the envelope of the tube with high frequency heating, and both top and bottom electrodes as well as the intermediate electrode were of a common thickness.
  • a high frequency coil is disposed around the envelope and is energized to produce magnetic flux which intersects each of the electrodes to thereby generate heat for fusing purposes.
  • the intermediate electrode in view of the higher flux density around the intermediate electrode compared to the relatively low density around the upper or lower electrode, and because of the greater diameter of the intermediate electrode, more flux is intersected by the intermediate electrode.
  • FIG. 1 is a schematic elevational section of a prior art triode discharge tube of the layer-built type arranged with a high frequency heating coil
  • FIG. 3 is an elevation, partly in section, of the discharge tube shown in FIG. 2,
  • FIG. 4 shows graphically the relation between the fusing temperature and heating time for various electrode thicknesses
  • FIG. 5 is an elevational section of the discharge tube constructed according to the invention, using disc electrodes to constitute a pentode structure.
  • FIG. 1 shows a prior art discharge tube which includes an upper electrode 1, a lower electrode 2 and an intermediate electrode 4, all of which have an equal thickness. These electrodes are fused with an envelope 3, which may comprise glass, by means of high frequency heating coil 7. As mentioned previously, more flux is intersected by the intermediate electrode as compared with the upper or lower electrode, with the consequence that the temperatures of the intermediate electrode rises more rapidly than the latter and hence is supplied with an additional amount of heat until the time when the other electrodes become sufficiently heated to permit their being fused with the envelope 3. Such overheating of the intermediate electrode causes strains in the glass envelope and degrades the quality of the product.
  • curve designated A represents the diagram for the thin electrodes l and 2
  • curve B for a thin intermediate electrode 4
  • curve C for a thick intermediate electrode 4A.
  • the points at which fusing takes place are indicated at 17 and 18 on the respective curves.
  • the top electrode 1 is thin, the second electrode 11 from the top is thick, the third electrode 12 is thin, the fourth electrode 13 is thick, and the bottom electrode 2 is thin.
  • odd-numbered electrodes are thin and smaller in diameter than even-numbered electrodes, while even-numbered electrodes are thick and greater in diameter.
  • High frequency heating coils 14, 15 and 16 are disposed only around thin electrodes 1, 12 and 2.
  • the envelope of the discharge tube has been described as comprising glass, it should be obvious that it may comprise ceramic material.
  • the electrode is provided with a melting metal for fusion with the envelope.
  • the invention is again effective to prevent undesired flow and attachment of the melting metal to other functional surfaces which might occur if the electrodes involve differential time periods to reach a melting temperature, and which would degrade their mechanical strength and other functions.
  • a multipleelectrode discharge tube of the layer-built type in which an intermediate disc electrode positioned between upper and lower disc electrodes has a greater diameter than the latter.
  • the method as claimed in claim 1 further comprising providing a plurality of first electrode members, placing a corresponding plurality of high frequency heating coils around the outer periphery of the envelope so as to oppose the corresponding first electrode members and energizing said coils to heat and fuse said plurality of first electrode members and said second electrode members with said envelope.
  • the method as claimed in claim 2 further comprising providing a plurality of second electrode members and alternating said first electrode members with said second electrode members.

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  • Gas-Filled Discharge Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US00211917A 1971-03-09 1971-12-27 Method of manufacturing a multiple-electrode discharge tube Expired - Lifetime US3771205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46012185A JPS523552B1 (fr) 1971-03-09 1971-03-09

Publications (1)

Publication Number Publication Date
US3771205A true US3771205A (en) 1973-11-13

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ID=11798342

Family Applications (1)

Application Number Title Priority Date Filing Date
US00211917A Expired - Lifetime US3771205A (en) 1971-03-09 1971-12-27 Method of manufacturing a multiple-electrode discharge tube

Country Status (2)

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US (1) US3771205A (fr)
JP (1) JPS523552B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2279249A (en) * 1939-01-26 1942-04-07 Westinghouse Electric & Mfg Co Spark gap device
US2409855A (en) * 1940-09-07 1946-10-22 Jr Curtis Hillyer Gaseous discharge tube
US2899590A (en) * 1959-08-11 Ceramic vacuum tube
US2910607A (en) * 1955-02-04 1959-10-27 Eitel Mccullough Inc Ceramic type electron tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899590A (en) * 1959-08-11 Ceramic vacuum tube
US2279249A (en) * 1939-01-26 1942-04-07 Westinghouse Electric & Mfg Co Spark gap device
US2409855A (en) * 1940-09-07 1946-10-22 Jr Curtis Hillyer Gaseous discharge tube
US2910607A (en) * 1955-02-04 1959-10-27 Eitel Mccullough Inc Ceramic type electron tube

Also Published As

Publication number Publication date
JPS523552B1 (fr) 1977-01-28

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