US1859029A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US1859029A
US1859029A US409804A US40980429A US1859029A US 1859029 A US1859029 A US 1859029A US 409804 A US409804 A US 409804A US 40980429 A US40980429 A US 40980429A US 1859029 A US1859029 A US 1859029A
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US
United States
Prior art keywords
tube
discharge tube
electric discharge
envelope
conductor
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
US409804A
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English (en)
Inventor
Boer Jan Hendrik De
Karel Marinus Van Gessel
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1859029A publication Critical patent/US1859029A/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
    • 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

Definitions

  • This invention has reference to an electric discharge tube, more particularly an incandescent cathode discharge tube.
  • This volatilization is usually efiected by heating a supply 'of the so-called getter material introduced into the tube to the temperature of volatilization by means of induction currents generated by a high frequency magnetic alternating field.
  • the material volatilized is thus precipitated on the colder parts of the tube and the gaseous residues or impurities are vinculated or absorbed.
  • the invention has for its object an electric discharge tube in which means are provided which render harmless any gaseous residues 5 or impurities set free during the operation of the tube, in a simple and easy manner.
  • An electric discharge tube comprises an incandescent cathode which has connected in parallel to it a conductor made of a substance which is capable of vinculating or absorbing gaseous residues or impurities at high temperatures.
  • this conductor is made of a substance of high specific electric resistance so as to permit small consumption of the current passing through this conductor.
  • Very good results may be obtained by constituting the conductor of zirconium.
  • other metals such as tantalum, molybdenum,- titanium, chromium, and aluminum may be used, it has been found that the best results are obtained with zirconium.
  • the conductor should not be connected in parallel to the incandescent cathode until after the exhaustion of the discharge tube, as otherwise the conductor may acquire too high a tem perature during exhaust.
  • one end of the conductor may be connected to a separate leading-in wire which is taken through the wall of the tube. After the exhaustion of the tube this wire may be connected to a leading-in wire of the incandescent cathode.
  • the discharge tube 1 shown in the figure is exhausted to the highest extent possible, and comprises a stem 2 having a pinch 3 on which the various electrodes of the tube are arranged. These electrodes comprise a cylindrical anode 4, which is supported upon a supporting wire 5, a grid 6, and a filament 7.
  • the grid 6 is secured to a wire 8 supported upon the supporting rods 9 and 10.
  • the incandescent cathode is secured to the sup ports 11 and 12 which have also mounted between them a wire 13 of zirconium, the dimensions of which wire are such that during the operation of the tube the wire is heated to such a high temperature that it vinculates or absorbs gaseous residues which may be set free during the operation of the tube.
  • the invention does not only extend to high vacuum discharge tubes such as valves for wireless telegraphy or telephony, X-ray tubes, rectifiers, etc., but alsoto discharge tubes having a gaseous filling, such as gas-filled rectifiers, for example tubes having a filling of rare gas to which metal Vapor, say mercury vapor, may be added.
  • an electron discharge device the combination with an evacuated envelope containing co-operating electrodes one of which is heatable and a pair of current supply leads connected to said heatable electrode, of a coherent body of zirconium of high electrical resistance connected during normal 0 eration of said device to said leads where y sufficient current passes through said heatable electrode and said body to maintain said electrode at operating temperature and said body at a temperature which renders it capable of combining permanently with the common occluded gases in said envelope.
  • an electron discharge device the combination with an evacuated envelope, an electrode therein, a co-operating heatable electrode, and a pair of current carrying leads connected to said heatable electrode, of an elongated body of zirconium in said envelope permanently connected to said leads in parallel to said heatable electrode and of such electrical resistance as to be maintained during normal operation at a temperature which renders it capable of combining permanently with the common occluded gases in said envelope.
  • An electron discharge device comprising a sealed envelope containing a heatable electrode and a co-operating electrode, a pair of conductors extending into said envelope, and a coherent body of zirconium connected to said heatable electrode in said envelope electrically connected to and mounted between said conductors and of an electrical resistance such that at normal operating potential on said conductors said body is maintained at a temperature which renders it capable of combining permanently with the common occluded gases in said envelope.
  • An electron discharge device comprising a sealed envelope, a pair of conductors extending into said envelope, a heatablecathode comprising a refractory filament connected to said conductor and a zirconium filament connected to said conductors in parallel to said refractory filament and proportioned to operate at normal voltage between said conductors at a temperature which renders it capable of combining permanently with the common occluded gases in said envelope.

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  • Physical Or Chemical Processes And Apparatus (AREA)
US409804A 1928-12-15 1929-11-26 Electric discharge tube Expired - Lifetime US1859029A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1859029X 1928-12-15

Publications (1)

Publication Number Publication Date
US1859029A true US1859029A (en) 1932-05-17

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ID=19873197

Family Applications (1)

Application Number Title Priority Date Filing Date
US409804A Expired - Lifetime US1859029A (en) 1928-12-15 1929-11-26 Electric discharge tube

Country Status (4)

Country Link
US (1) US1859029A (fr)
BE (1) BE365960A (fr)
FR (1) FR686234A (fr)
NL (1) NL24989C (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2668253A (en) * 1950-07-06 1954-02-02 American Television Inc Getter for electron discharge devices
US2749466A (en) * 1951-12-18 1956-06-05 Machlett Lab Inc Electron tube gettering means
US2794932A (en) * 1951-01-12 1957-06-04 Ets Claude Paz & Silva Gas absorbent material
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter
US3149716A (en) * 1959-09-29 1964-09-22 Dick Co Ab Evaporator vacuum pump
US3262756A (en) * 1962-12-18 1966-07-26 Gerald W Keilholtz Method for analyzing inert gas for presence of oxygen or water vapor
US4622433A (en) * 1984-03-30 1986-11-11 Diacon, Inc. Ceramic package system using low temperature sealing glasses
US5017831A (en) * 1987-12-30 1991-05-21 Gte Products Corporation Glow discharge lamp with getter material on anode

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449786A (en) * 1943-03-05 1948-09-21 Westinghouse Electric Corp Getter
US2668253A (en) * 1950-07-06 1954-02-02 American Television Inc Getter for electron discharge devices
US2794932A (en) * 1951-01-12 1957-06-04 Ets Claude Paz & Silva Gas absorbent material
US2749466A (en) * 1951-12-18 1956-06-05 Machlett Lab Inc Electron tube gettering means
US3149716A (en) * 1959-09-29 1964-09-22 Dick Co Ab Evaporator vacuum pump
US3090852A (en) * 1960-02-11 1963-05-21 Gen Electric Gettering arrangement for a vacuum circuit interrupter
US3262756A (en) * 1962-12-18 1966-07-26 Gerald W Keilholtz Method for analyzing inert gas for presence of oxygen or water vapor
US4622433A (en) * 1984-03-30 1986-11-11 Diacon, Inc. Ceramic package system using low temperature sealing glasses
US5017831A (en) * 1987-12-30 1991-05-21 Gte Products Corporation Glow discharge lamp with getter material on anode

Also Published As

Publication number Publication date
FR686234A (fr) 1930-07-23
BE365960A (fr)
NL24989C (fr)

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