GB590520A - Indirectly-heated cathode structures for electron discharge devices - Google Patents

Indirectly-heated cathode structures for electron discharge devices

Info

Publication number
GB590520A
GB590520A GB2090/45A GB209045A GB590520A GB 590520 A GB590520 A GB 590520A GB 2090/45 A GB2090/45 A GB 2090/45A GB 209045 A GB209045 A GB 209045A GB 590520 A GB590520 A GB 590520A
Authority
GB
United Kingdom
Prior art keywords
insulating plate
coil
heating coil
metal disc
jan
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
GB2090/45A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB590520A publication Critical patent/GB590520A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/36—Tubes with flat electrodes, e.g. disc electrode
    • 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)
  • Solid Thermionic Cathode (AREA)

Abstract

590,520. Thermionic cathodes. STANDARD TELEPHONES & CABLES, Ltd. Jan. 26, 1945, No. 2090. Convention date, Jan. 31, 1944, [Class 39 (iii)] [Also in Group XL] An indirectly heated cathode for an electron discharge device comprises an insulating plate 28, Fig. 2, having an integral upturned ring 56 to which a metal disc 26, Fig. 3, carrying the emissive layer is secured, a heating coil 30, 32, in the form of a double spiral secured in the hollow enclosure thus formed out of contact with the metal disc 26, and two current supply leads for the coil connected one to both ends of the coil and the other to its mid-point, the cathode structure being supported by means of its lead-wires from an insulating seal at the base of the discharge device, Fig. 1 (not shown). The heater coil 30, 32 may be embedded in the insulating plate 28 and is preferably wound more closely near the periphery of the disc 28 than at the centre thereof, as shown in Fig. 2. In a modification, Figs. 6, 7 (not shown) the heating coil is supported above the surface of the insulating plate by means of a plurality of wire "pigtails." In a further modification, Fig. 4, the insulating plate 128 is provided with a plurality of radially extending ribs 158 integral therewith having arcuate notches 160 which serve to hold the heating coil 30, 32 in position. The upper surface of the insulating plate may be coated with heat reflecting material, e.g., magnesium oxide, so as to concentrate the heat on the metal disc 26.
GB2090/45A 1944-01-31 1945-01-26 Indirectly-heated cathode structures for electron discharge devices Expired GB590520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US520383A US2421039A (en) 1944-01-31 1944-01-31 Cathode structure

Publications (1)

Publication Number Publication Date
GB590520A true GB590520A (en) 1947-07-21

Family

ID=24072365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2090/45A Expired GB590520A (en) 1944-01-31 1945-01-26 Indirectly-heated cathode structures for electron discharge devices

Country Status (5)

Country Link
US (1) US2421039A (en)
BE (1) BE470922A (en)
CH (1) CH259587A (en)
FR (1) FR928312A (en)
GB (1) GB590520A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899591A (en) * 1959-08-11 Electrical heating device
US2500355A (en) * 1944-11-14 1950-03-14 Sylvania Electric Prod Electron discharge tube
US2436907A (en) * 1945-06-23 1948-03-02 Nasa Indirectly heated cathode
BE475720A (en) * 1946-08-30
FR1137688A (en) * 1954-10-22 1957-06-03 Thomson Houston Comp Francaise Advanced cathode
DE1143589B (en) * 1959-12-22 1963-02-14 Edgerton Germeshausen And Grie Method of manufacturing a heater for cathodes of electrical discharge tubes
US3558965A (en) * 1967-10-02 1971-01-26 Nat Video Corp Cathode for television tube and method of making
US4296311A (en) * 1979-08-15 1981-10-20 The Kanthal Corporation Electric hot plate
GB2192751B (en) * 1986-07-14 1991-02-13 Denki Kagaku Kogyo Kk Method of making a thermionic cathode structure.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1102249A (en) * 1911-10-31 1914-07-07 Cutler Hammer Mfg Co Electric resistance unit.
US1539497A (en) * 1922-03-27 1925-05-26 W B Mcallister Company Electrical heating device
US1866195A (en) * 1929-06-01 1932-07-05 Ile De France Radio valves employing gallium
FR700923A (en) * 1929-11-13 1931-03-09 Telefunken Gmbh Heated cathode tube and control electrode
US2051637A (en) * 1934-12-07 1936-08-18 Electric Trading Corp Electrical heating device
US2300891A (en) * 1941-04-25 1942-11-03 Hankscraft Co Liquid conductor heater
US2357905A (en) * 1942-01-26 1944-09-12 Mcgraw Electric Co Automatic sadiron
BE478852A (en) * 1942-06-26

Also Published As

Publication number Publication date
US2421039A (en) 1947-05-27
FR928312A (en) 1947-11-25
CH259587A (en) 1949-01-31
BE470922A (en)

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