GB1039910A - Indirectly heated cathode - Google Patents

Indirectly heated cathode

Info

Publication number
GB1039910A
GB1039910A GB2478263A GB2478263A GB1039910A GB 1039910 A GB1039910 A GB 1039910A GB 2478263 A GB2478263 A GB 2478263A GB 2478263 A GB2478263 A GB 2478263A GB 1039910 A GB1039910 A GB 1039910A
Authority
GB
United Kingdom
Prior art keywords
cathode
heater
insulating material
june
embedded
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
GB2478263A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston 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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1039910A publication Critical patent/GB1039910A/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

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,039,910. Indirectly-heated cathodes. COMPAGNIE FRANCAISE THOMSON-HOUSTON. June 21, 1963 [June 29, 1962], No. 24782/63. Heading H1D. [Also in Division H5] A cathode heater 10 is embedded in a refractory insulating material 9 by the Schoop process, i.e. spraying with droplets of molten material, and is assembled with a cathode 1 but is not fixed to its inner walls. During manufacture, a layer of magnesium oxide or aluminium oxide may be deposited by the Schoop process on the convex surface of a stainless steel mandrel, a spiral heater is laid thereon and further insulating material is deposited until the heater is embedded in a mass of insulating material having an undulating outer convex surface, and a smooth concave surface which conforms to the under-surface of cathode 1. As shown, two concave screens 7, 8 having a smaller curvature than cathode base 1, are arranged behind the heater, screen 8 only contacting insulating mass 9 over a small area. The insulated heater is held in contact with cathode 1 by central stem 6 and by insulated leads 11, 12 secured to a plate 5, from which cathode 1 is supported by feet 4. The invention may also be applied to cylindrical cathodes.
GB2478263A 1962-06-29 1963-06-21 Indirectly heated cathode Expired GB1039910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR902516A FR1334534A (en) 1962-06-29 1962-06-29 Indirectly heated cathode

Publications (1)

Publication Number Publication Date
GB1039910A true GB1039910A (en) 1966-08-24

Family

ID=8782204

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2478263A Expired GB1039910A (en) 1962-06-29 1963-06-21 Indirectly heated cathode

Country Status (2)

Country Link
FR (1) FR1334534A (en)
GB (1) GB1039910A (en)

Also Published As

Publication number Publication date
FR1334534A (en) 1963-08-09

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