ES350511A1 - Indirectly heated cathode for an electron discharge tube with an insulated heating element - Google Patents

Indirectly heated cathode for an electron discharge tube with an insulated heating element

Info

Publication number
ES350511A1
ES350511A1 ES350511A ES350511A ES350511A1 ES 350511 A1 ES350511 A1 ES 350511A1 ES 350511 A ES350511 A ES 350511A ES 350511 A ES350511 A ES 350511A ES 350511 A1 ES350511 A1 ES 350511A1
Authority
ES
Spain
Prior art keywords
layer
indirectly heated
cathode
heating element
heated cathode
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
Application number
ES350511A
Other languages
Spanish (es)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES350511A1 publication Critical patent/ES350511A1/en
Expired legal-status Critical Current

Links

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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/24—Insulating layer or body located between heater and emissive material
    • 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
    • H01J1/26—Supports for the emissive material

Abstract

In an indirectly heated cathode in which a heater wire 3 is insulated by a metal oxide layer 6 from a support 1 carrying emissive material 4, the surface of the support 1 which faces the heater wire comprises molybdenum coated with a layer 5 of at least one of the metals of the platinum group having a thickness of at least 3 ÁThe layer 5, e.g. of platinum, is applied in the non-molten state, e.g. by deposition from a suspension or by electroplating, and also is not subjected to any subsequent melting. Preferably, the heater wire has a coating of metal of the platinum group, which has been applied in the non-molten state and then melted, underlying the metal oxide layer 6, which may be of Al 2 O 3 or MgO. Emissive layer 4 may comprise a mixture of nickel powder and alkaline earth metal oxides. The cathode may be a dispenser cathode.
ES350511A 1967-02-17 1968-02-15 Indirectly heated cathode for an electron discharge tube with an insulated heating element Expired ES350511A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL676702376A NL153018B (en) 1967-02-17 1967-02-17 INDIRECTLY HEATED CATHODE.

Publications (1)

Publication Number Publication Date
ES350511A1 true ES350511A1 (en) 1969-05-16

Family

ID=19799315

Family Applications (1)

Application Number Title Priority Date Filing Date
ES350511A Expired ES350511A1 (en) 1967-02-17 1968-02-15 Indirectly heated cathode for an electron discharge tube with an insulated heating element

Country Status (8)

Country Link
US (1) US3553521A (en)
AT (1) AT276576B (en)
BE (1) BE710828A (en)
CH (1) CH468713A (en)
ES (1) ES350511A1 (en)
FR (1) FR1553520A (en)
GB (1) GB1150409A (en)
NL (1) NL153018B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883767A (en) * 1974-02-08 1975-05-13 Gte Sylvania Inc Heater for fast warmup cathode
US3881126A (en) * 1974-03-06 1975-04-29 Gte Sylvania Inc Fast warm-up cathode assembly
JPS6023454B2 (en) * 1978-11-29 1985-06-07 株式会社日立製作所 electron tube cathode
DE3029853C2 (en) * 1980-08-07 1982-08-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Wehnelt cathode indirectly heated by electron impact
NL8304401A (en) * 1983-12-22 1985-07-16 Philips Nv OXYD CATHODE.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733378A (en) * 1956-01-31 Thermionic cathodes for electronic discharge devices
US1719988A (en) * 1923-01-26 1929-07-09 Westinghouse Lamp Co Electron device and the like adapted for alternating current
US2878410A (en) * 1954-11-09 1959-03-17 Gen Electric Electronic tube structure
GB937391A (en) * 1962-02-14 1963-09-18 Mullard Ltd Cold-cathode glow-discharge tubes
US3268305A (en) * 1964-08-17 1966-08-23 Sylvania Electric Prod Composite wire
US3401297A (en) * 1965-08-23 1968-09-10 Varian Associates Thermionic cathodes for electron discharge devices with improved refractory metal heater wires

Also Published As

Publication number Publication date
BE710828A (en) 1968-08-16
DE1639341A1 (en) 1971-04-08
GB1150409A (en) 1969-04-30
NL153018B (en) 1977-04-15
NL6702376A (en) 1968-08-19
FR1553520A (en) 1969-01-10
CH468713A (en) 1969-02-15
DE1639341B2 (en) 1976-02-12
AT276576B (en) 1969-11-25
US3553521A (en) 1971-01-05

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