US1757233A - Discharge tube - Google Patents

Discharge tube Download PDF

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Publication number
US1757233A
US1757233A US740738A US74073824A US1757233A US 1757233 A US1757233 A US 1757233A US 740738 A US740738 A US 740738A US 74073824 A US74073824 A US 74073824A US 1757233 A US1757233 A US 1757233A
Authority
US
United States
Prior art keywords
cathode
tubular
tube
conductor
anode
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
US740738A
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English (en)
Inventor
Bol Cornelis
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
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1757233A publication Critical patent/US1757233A/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
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • 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
    • H01J19/74—Cooling arrangements

Definitions

  • This invention has reference to incandescent cathode discharge tubes, especially to discharge tubes of the said kind, the operation of which is essentially based on elec- 5 tronic motion.
  • the invention has for its object to cause the magnetic field referred to to disappear or at least to materially weaken the same by a particular construction of the cathode 5 and also to insure a very solid arrangement minimum value as otherwise the electrons of the incandescent cathode coaxially with other cylindrical electrodes.
  • the incandescent cathode In discharge tubes according to the inventron the incandescent cathode consists of a tube inside of which is a conductor, the tube and the conductor being so shaped and arranged relatively to each other that the magnetic fields generated by currents of equal strength and flowing in the tube and in the conductor in opposite directions neutralize or at least materially weaken each other outside the tube.
  • the conductor provided within the tube may consist of one or more wires.
  • the incandescent cathode accordingto the invention may preferably consist of a tube having an annular cross-section, a conductor being substantially coaxially arranged inside said tube, the tube and the conductor being at one end in conductive connection with each other.
  • the conductor in the tubular incandescent cathode may be The rectifier shown on the drawing conformed into a tubular aggregate.
  • the incandescent cathode may be superficially coated with substances that easily emit electrons, for'example, with one or more oxides of material, prefthealkaline earth metals and the tube itself may in this case be constructed of material having a lower melting point than tungsten, such for example as platinum or nickel.
  • the tube 1 is on one side in conductive connection with a conductor 3.
  • the conductor may at that place be provided with a flared out or expanded portion 2 which is sealed-to the tubular cathode.
  • the conductor 3 is substantially coaxially arranged in the tube and may consist of material which is a good conductor of electricity, such for example as nickel or copper. It will however frequently be essential to also make the conductor 3 of tungsten.
  • the conductor 3 and the tube 1 must be adapted to carry a current of e ual strength.
  • the crosssection of the con uctor 3 is chosen that the temperature of t e latter during the operation of the tube remains lower than of thetubular cathode 1.
  • the conductor 3 is clas ed within a binary strap 4: as indicated in igure 1, which strap may consist of nickel and is connected in any way for example by soldering, to two metal caps 5 hermeticall sealed at the edge to the ends of glass tu es 6.
  • Thecaps 5 have fixed to them leading-inwires 7.
  • Suitable material forthe said caps is chrome iron of such composition thatits coeflicient of expansion corresponds to that of the glass. When using for example potassium soda glass, the content of chromium may be about 17 to 20%.
  • the leadin -in wires-7 On the other side of the caps 5 are secured-the leadin -in wires-7.
  • he tubular incandescent cathode 1 is clasped within a binary strap 8 secured to two caps 9, which in their turn have fixed to them leading-in wires 10.
  • The'caps are hermetically sealed t6 glass tubes 11 and may consist for example 0 chrome iron of suitable composition.
  • the glass tubes 11 and the tube 5 form part of a glass sealing member 12 which at the edge is hermetically sealed to the end of avessel 13 serving as an anode.
  • This vessel may at the place of sealing consist of chrome iron of suitable. composition, and preferably the entire vessel is made of chrome iron.
  • the vessel 13 is cylindrical and coaxially arranged relatively to the incandescent cathode 1. It is provided with a thread 14 by means of which the discharge tube'can be located in a vessel through which a cooling'liquid for thejan'ode 13 flows.
  • the conductor 3 shewn in Fi re 2 is made hollow and has arranged inside a tube of small diameter'15 for t e supply of the cooling medium.
  • the conductor 3 may in this case be connected directly to a ca 16 which has fixed to it a leading-in wire 1%.
  • the leadin -in wire17 should'be hollow so as to allow or the passage of the tube 15.
  • a discharge tube having a tubular incandescent cathode, a hollow conductor disposed substantially coaxially within said tubular cathode, said conductor and said tubular cathode being at one end connection with each other, and means for cooling the said hollow conductor.
  • a discharge tube having a cylindrical anode member forming a portion of the outside wall of said tube, a base portion for said tube and an. air-tight connection between said base portion and said anode member, a tubular cathode member extendin coaxially of said anode member contained within' said tube closed by said anode member, means for supporting said tubular cathode within said tube and rigidly fastening the same, connections for supplying current to said tubular cathode passing through said support means,
  • tubular cathode and base member, a second tubular member contained within said tubular cathode and in conductive relationship therewith at one end, and means for rigidly mounting said second tubular member within said cathode and establishing a current connection therewith, said tubular'cathode and said inner conducting tube providing means for neutralizing magnetic fields produced by current flowing through said members whereby electronic emission takes place in a radial direction between said cathode and anode.
  • a cylindrical anode member In a discharge vessel, a cylindrical anode member, a glass support means for said anode of like diameter to said anode, means for hermetically'sealing said glass support means and said cylindrical anode to form'an evacuated envelope, a tubular cathode supported within said cylindrical anode andarranged coaxially with respect thereto, a plurality of connections between said glass support member and said gathode for supplying current to said cathode and rigidly mounting the same, a tubular member within said cathode for completing the cathode circuit and permitting currents to flow therethrough in an opposite direction to the direction of flow through said cathode,
  • tubular cathode and inner tubular member providing means whereby currents flowing t erethrough produce magnetic fields in opposite directions so that the field outside said tubular cathode is neutralized and electronic emission takes place between said cathode and said anode in a radial direc-. tion.
  • a glass supporting member forming a base for the discharge apparatus, a tubular anode member, said member being of like cross-sectional size to said glass support member and means for fastening said glass support member to said anode and providing an hermetim cally sealed body, a tubular cathode within said hermetically sealed body, a binary strap carried by said glass support for rigidly mounting said tubular cathode coaxially with respectto said anode, means for sealing said strapto said glass support, said strap providing means for establishing a current connec-. tion for said tubular cathode, a second binary stra supported from said glass support, and
  • tubular member carried thereby and rigidly supported within said tubular cathode, said tubular member and said cathode being in conductive relationship with respect to each other at the end remote from said support, said cathode and inner tubular member providing means for producing opposing ma net-ic fields external to said tubular catho e upon a flow of current therethrough, whereby the magnetic field external to said cathode is neutralized and electronic emission takes place in radial direction from said cathode to said anode.

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Lasers (AREA)
US740738A 1923-10-17 1924-09-30 Discharge tube Expired - Lifetime US1757233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL223564X 1923-10-17

Publications (1)

Publication Number Publication Date
US1757233A true US1757233A (en) 1930-05-06

Family

ID=19779506

Family Applications (1)

Application Number Title Priority Date Filing Date
US740738A Expired - Lifetime US1757233A (en) 1923-10-17 1924-09-30 Discharge tube

Country Status (4)

Country Link
US (1) US1757233A (fr)
FR (1) FR587096A (fr)
GB (1) GB223564A (fr)
NL (1) NL14962C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460119A (en) * 1944-09-23 1949-01-25 Gen Electric Magnetron
US2493423A (en) * 1944-05-29 1950-01-03 Rca Corp Electron discharge device of the magnetron type
US2761992A (en) * 1950-08-19 1956-09-04 Siemens Reiniger Werke Ag Electrical discharge tube
EP0326273A3 (fr) * 1988-01-26 1990-07-11 Eev Limited Cathodes à chauffage direct

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2493423A (en) * 1944-05-29 1950-01-03 Rca Corp Electron discharge device of the magnetron type
US2460119A (en) * 1944-09-23 1949-01-25 Gen Electric Magnetron
US2761992A (en) * 1950-08-19 1956-09-04 Siemens Reiniger Werke Ag Electrical discharge tube
EP0326273A3 (fr) * 1988-01-26 1990-07-11 Eev Limited Cathodes à chauffage direct

Also Published As

Publication number Publication date
GB223564A (en) 1925-06-11
FR587096A (fr) 1925-04-10
NL14962C (fr)

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