FR2373866A1 - Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts. - Google Patents

Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts.

Info

Publication number
FR2373866A1
FR2373866A1 FR7637326A FR7637326A FR2373866A1 FR 2373866 A1 FR2373866 A1 FR 2373866A1 FR 7637326 A FR7637326 A FR 7637326A FR 7637326 A FR7637326 A FR 7637326A FR 2373866 A1 FR2373866 A1 FR 2373866A1
Authority
FR
France
Prior art keywords
indirectly heated
emissive layer
heat conductor
container
prod
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.)
Granted
Application number
FR7637326A
Other languages
French (fr)
Other versions
FR2373866B1 (en
Inventor
Jean-Michel Montgaillard
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7637326A priority Critical patent/FR2373866A1/en
Publication of FR2373866A1 publication Critical patent/FR2373866A1/en
Application granted granted Critical
Publication of FR2373866B1 publication Critical patent/FR2373866B1/fr
Granted 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

Abstract

Indirectly heated thermoelectric cathode consists of a container carrying an emissive layer and contg. a heat conductor. The conductor is coated with an insulating material consisting of the prod. of sintering a mixt. of >=2 insulating frittable components >=1 of which has a thermal expansion coefft. greater than that of the conductor. The coefft of expansion of the prod. of sintering at least one other component is less than that of the filament. Used for indirectly heated electron tubes. No cradles form at elevated temp. between the filament and the casing as occured in prior art. Prod. is more robust and was better resistant to mechanical and thermal shock and to damage by vibration.
FR7637326A 1976-12-10 1976-12-10 Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts. Granted FR2373866A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7637326A FR2373866A1 (en) 1976-12-10 1976-12-10 Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7637326A FR2373866A1 (en) 1976-12-10 1976-12-10 Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts.

Publications (2)

Publication Number Publication Date
FR2373866A1 true FR2373866A1 (en) 1978-07-07
FR2373866B1 FR2373866B1 (en) 1979-03-30

Family

ID=9180925

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7637326A Granted FR2373866A1 (en) 1976-12-10 1976-12-10 Indirectly heated thermo:electronic cathode - comprises a container with an emissive layer and a heat conductor with controlled expansion coeffts.

Country Status (1)

Country Link
FR (1) FR2373866A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311501A1 (en) * 1987-10-09 1989-04-12 Thomson-Csf Strongly built oxide cathode for cathode ray tubes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311501A1 (en) * 1987-10-09 1989-04-12 Thomson-Csf Strongly built oxide cathode for cathode ray tubes
FR2621735A1 (en) * 1987-10-09 1989-04-14 Thomson Csf ROBUST OXIDE CATHODE FOR CATHODE RAY TUBE
US4912362A (en) * 1987-10-09 1990-03-27 Thomson-Csf Sturdy oxide cathode for cathode ray tube

Also Published As

Publication number Publication date
FR2373866B1 (en) 1979-03-30

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