US2164913A - Indirectly heated cathode - Google Patents

Indirectly heated cathode Download PDF

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Publication number
US2164913A
US2164913A US45701A US4570135A US2164913A US 2164913 A US2164913 A US 2164913A US 45701 A US45701 A US 45701A US 4570135 A US4570135 A US 4570135A US 2164913 A US2164913 A US 2164913A
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US
United States
Prior art keywords
wire
cathode
indirectly heated
heated cathode
heater
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
US45701A
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English (en)
Inventor
Goodchild Frank Douglas
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2164913A publication Critical patent/US2164913A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Definitions

  • This invention relates to indirectly heated cathodes for thermionic valves.
  • a heater for an indirectly heated cathode of a thermionic valve is formed by separately covering a plurality of wires with insulating material, then placing the wires parallel and coating them with a second coating of insulating material and finally forming the multiple wire into the shape required for insertion into the cathode.
  • This construction enables a given length of heater wire to be inserted into a smaller space, and also enables the heater wire to be maintained in a specified arrangement after folding into shape so that it can readily be fitted to any particular form of cathode.
  • Figure 1 shows a heater for an indirectly heated cathode formed according to the invention from two wires
  • Figs. 2 to 5 show various forms of cathode using a heater according to the invention.
  • tungsten wire is coated with'an insulating coating of, for example, aluminium oxide by any usual method such as spraying with or dipping it into a sludge of this material, which is afterwards dried to leave a coating of solid aluminium oxide.
  • the coating is preferably not so thick as that applied when a single length of wire is to be folded to form the heater.
  • FIG. 2 shows the manner in which the twin wire is folded into a bundle and disposed within a cylindrical cathode
  • Fig. 1 shows one manner in which the twin wire may be folded into a flat zig-zag form for insertion into a cathode of flattened form.
  • the insulating coating breaks away, in the same manner as it does at the bends of a single wire, but with the double wire it is clear that there will be less danger of short circuits between the exposed tips of the loops.
  • Figure 3 shows the flat zig-zag of Figure l inserted into a cathode of fiat rectangular shape.
  • the two wires are cut at one end and there joined as shown at b, Fig. 3.
  • the other ends c, d of the two wires are connected to suitable leads for the heating current which traverses one wire of the zig-zag and returns along the other wire.
  • a heater of cathode for insertion into a flattened form may be formed into a series of flat wire above referred to.
  • Figure 5 shows a fiattened rectangular cathode into which has been inserted a zig-zag winding of a triple core wire.
  • the heating current enters by one outside wire 0 at one end of the zig-zag and leaves by the other outside wire d at the other end of the zig-zag, the wire 0 and d being joined in the middle wire at f and g respectively as shown.
  • An indirectly heated cathode for a thermionic Valve comprising an open-ended casing of rectangular cross section having a greater length than breadth, an insulated structure of width approximately the internal breadth of said cathode mounted in the interior thereof, said structure being lated cores composed of three separately insucovered as a unit to form a triple wire and folded into fiat zigzag form, each fold thereof consisting of two separate parts, each part comprising a single insulated body having a triple wire core, and means interconnecting the end of said triple wire core in series, whereby a single series conductor arrangement is provided.

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  • Solid Thermionic Cathode (AREA)
  • Electron Sources, Ion Sources (AREA)
US45701A 1935-03-06 1935-10-19 Indirectly heated cathode Expired - Lifetime US2164913A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7041/35A GB453154A (en) 1935-03-06 1935-03-06 Improvements in or relating to indirectly heated cathodes for thermionic valves

Publications (1)

Publication Number Publication Date
US2164913A true US2164913A (en) 1939-07-04

Family

ID=9825498

Family Applications (1)

Application Number Title Priority Date Filing Date
US45701A Expired - Lifetime US2164913A (en) 1935-03-06 1935-10-19 Indirectly heated cathode

Country Status (6)

Country Link
US (1) US2164913A (enrdf_load_stackoverflow)
BE (1) BE411406A (enrdf_load_stackoverflow)
DE (1) DE755099C (enrdf_load_stackoverflow)
FR (1) FR798600A (enrdf_load_stackoverflow)
GB (1) GB453154A (enrdf_load_stackoverflow)
NL (1) NL42560C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487695A (en) * 1946-11-29 1949-11-08 North American Geophysical Com Electric heating element
US2742585A (en) * 1952-08-22 1956-04-17 Gen Electric Electrical vapor detector
US2753480A (en) * 1952-10-11 1956-07-03 Rca Corp Indirectly heated cathode structure and method of assembly
US2885334A (en) * 1954-01-01 1959-05-05 Int Standard Electric Corp Thermionic cathode heaters
US2899664A (en) * 1956-02-27 1959-08-11 Electric heating units and methods of making the same
US2935709A (en) * 1958-03-18 1960-05-03 Ii William A Paine Apparatus and method for strain rod assembly and filament core
US3265924A (en) * 1962-06-29 1966-08-09 York Res Corp Thermionic tube having novel heater and cathode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749312A (en) * 1953-05-02 1956-05-23 Emi Ltd Improvements in or relating to indirectly heated cathodes for electron discharge devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH157162A (de) * 1930-07-03 1932-09-15 Gustav Ganz & Co Indirekt geheizte Glühkathode für Entladungsröhren.
NL36127C (enrdf_load_stackoverflow) * 1932-02-16
US2158665A (en) * 1932-06-30 1939-05-16 Hygrade Sylvania Corp Electron discharge device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487695A (en) * 1946-11-29 1949-11-08 North American Geophysical Com Electric heating element
US2742585A (en) * 1952-08-22 1956-04-17 Gen Electric Electrical vapor detector
US2753480A (en) * 1952-10-11 1956-07-03 Rca Corp Indirectly heated cathode structure and method of assembly
US2885334A (en) * 1954-01-01 1959-05-05 Int Standard Electric Corp Thermionic cathode heaters
US2899664A (en) * 1956-02-27 1959-08-11 Electric heating units and methods of making the same
US2935709A (en) * 1958-03-18 1960-05-03 Ii William A Paine Apparatus and method for strain rod assembly and filament core
US3265924A (en) * 1962-06-29 1966-08-09 York Res Corp Thermionic tube having novel heater and cathode

Also Published As

Publication number Publication date
BE411406A (enrdf_load_stackoverflow)
DE755099C (de) 1953-10-26
FR798600A (fr) 1936-05-20
GB453154A (en) 1936-09-07
NL42560C (enrdf_load_stackoverflow)

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