GB761684A - Improvements in or relating to cathodes for electric discharge tubes - Google Patents

Improvements in or relating to cathodes for electric discharge tubes

Info

Publication number
GB761684A
GB761684A GB975154A GB975154A GB761684A GB 761684 A GB761684 A GB 761684A GB 975154 A GB975154 A GB 975154A GB 975154 A GB975154 A GB 975154A GB 761684 A GB761684 A GB 761684A
Authority
GB
United Kingdom
Prior art keywords
wire
coil
group
mass
turns
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
GB975154A
Inventor
Otto Pressel
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve Co Ltd
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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB975154A priority Critical patent/GB761684A/en
Publication of GB761684A publication Critical patent/GB761684A/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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Abstract

761,684. Making cathodes for electric discharge tubes; soldering. MULLARD RADIO VALVE CO., Ltd. Feb. 16, 1955 [April 2, 1954], No. 9751/54. Classes 83 (2) and 83 (4). [Also in Group XL (a)] A cylindrical dispenser cathode comprises a tube 2 made by continuously welding or solder. ing together adjacent turns of a coil of wire to form a support for a porous mass of sintered refractory metal 5, the pores of which contain the emissive material. The mass 5 may be preformed or formed in situ. The coil 2 may be of tungsten wire, and the soldering effected by winding over it a lower melting-point wire, e.g. molybdenum, and heating, or by using a molybdenum coated wire, at the same time securing locating flanges 7, 8. Some suitable dimensions are given for a magnetron cathode. According to the Provisional Specification, the emissive material may alternatively be formed as a layer on the inner surface of the mass 5. This Specification also shows the turns of the coil 2 as welded together at the ends only, the central turns being spaced apart. Specifications 709,367, 734,209 and 734,311, [all in Group XL (a)], are referred to and' Specification 641,581, [Group XL (a)], is referred to the Provisional Specification.
GB975154A 1954-04-02 1954-04-02 Improvements in or relating to cathodes for electric discharge tubes Expired GB761684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB975154A GB761684A (en) 1954-04-02 1954-04-02 Improvements in or relating to cathodes for electric discharge tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB975154A GB761684A (en) 1954-04-02 1954-04-02 Improvements in or relating to cathodes for electric discharge tubes

Publications (1)

Publication Number Publication Date
GB761684A true GB761684A (en) 1956-11-21

Family

ID=9878068

Family Applications (1)

Application Number Title Priority Date Filing Date
GB975154A Expired GB761684A (en) 1954-04-02 1954-04-02 Improvements in or relating to cathodes for electric discharge tubes

Country Status (1)

Country Link
GB (1) GB761684A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957100A (en) * 1957-08-27 1960-10-18 Philips Corp Magnetron cathode structure
US3376461A (en) * 1964-12-28 1968-04-02 Varian Associates Thermionic cathodes and high frequency electron discharge devices
GB2214704A (en) * 1988-01-20 1989-09-06 English Electric Valve Co Ltd Magnetron cathode assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957100A (en) * 1957-08-27 1960-10-18 Philips Corp Magnetron cathode structure
US3376461A (en) * 1964-12-28 1968-04-02 Varian Associates Thermionic cathodes and high frequency electron discharge devices
GB2214704A (en) * 1988-01-20 1989-09-06 English Electric Valve Co Ltd Magnetron cathode assembly
US5172030A (en) * 1988-01-20 1992-12-15 Eev Limited Magnetron

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