GB1160819A - Cathodes for Magnetrons - Google Patents

Cathodes for Magnetrons

Info

Publication number
GB1160819A
GB1160819A GB56130/67A GB5613067A GB1160819A GB 1160819 A GB1160819 A GB 1160819A GB 56130/67 A GB56130/67 A GB 56130/67A GB 5613067 A GB5613067 A GB 5613067A GB 1160819 A GB1160819 A GB 1160819A
Authority
GB
United Kingdom
Prior art keywords
support
cathode
dec
bodies
magnetron
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
GB56130/67A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1160819A publication Critical patent/GB1160819A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons

Landscapes

  • Microwave Tubes (AREA)

Abstract

1,160,819. Cathode constructions. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 11 Dec., 1967 [14 Dec., 1966], No. 56130/67. Heading H1D. A cathode for a magnetron comprises a cathode support 1 surrounding a heater 2 and carrying a first electron emitting body 5 and at least one second electron emitting body 12 of a different material which is in poor thermal contact with the support. The first body 5 consists mainly of tungsten and is preferably a dispenser cathode, and the second body 12 consists mainly of molybdenum and is heated by electron back-bombardment, and an annular gap is provided between the support 1 and the second body 12 which is secured to the support by a ring 13. Since the second bodies 12 are thermally insulated from the support they are cooled mainly by radiation, thereby increasing the permissible power of the magnetron. Preferably there are two bodies 12 each of a larger diameter than the first body 5 so that they shield the ends 10 and 11 of the screening hoods 7 and 8 from deposition of emissive material evaporated from the first body 5. The support 1 may be of reduced wall thickness as shown at 15 in the vicinity of the lower second body 12.
GB56130/67A 1966-12-14 1967-12-11 Cathodes for Magnetrons Expired GB1160819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0040995 1966-12-14

Publications (1)

Publication Number Publication Date
GB1160819A true GB1160819A (en) 1969-08-06

Family

ID=7377513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB56130/67A Expired GB1160819A (en) 1966-12-14 1967-12-11 Cathodes for Magnetrons

Country Status (7)

Country Link
US (1) US3505557A (en)
BE (1) BE707876A (en)
DE (1) DE1541026B2 (en)
ES (1) ES348151A1 (en)
FR (1) FR1569624A (en)
GB (1) GB1160819A (en)
NL (1) NL6716680A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1399260A (en) * 1972-12-21 1975-07-02 English Electric Valve Co Ltd Magnetrons
US3896332A (en) * 1973-06-04 1975-07-22 M O Valve Co Ltd High power quick starting magnetron
US6497118B1 (en) * 2000-09-19 2002-12-24 Corning Incorporated Method and apparatus for reducing refractory contamination in fused silica processes

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2869012A (en) * 1955-10-10 1959-01-13 Rudolf A Muller Thermionic device
US2957100A (en) * 1957-08-27 1960-10-18 Philips Corp Magnetron cathode structure
DE1143931B (en) * 1959-10-13 1963-02-21 Tesla Np Storage cathode for discharge lamps with a porous cathode body
GB943535A (en) * 1959-10-16 1963-12-04 Tesla Np Improvements in or relating to discharge lamps
NL272981A (en) * 1961-01-02
FR1277518A (en) * 1961-01-09 1961-12-01 Philips Nv Resonant cavity magnetron with cylindrical cathode
US3192436A (en) * 1961-06-02 1965-06-29 Litton Industries Inc Heater switching cathode for magnetrons
FR1306999A (en) * 1961-11-25 1962-10-19 Cie Francaise De Micro Ondes Cold cathode for magnetron

Also Published As

Publication number Publication date
FR1569624A (en) 1969-04-28
NL6716680A (en) 1968-06-17
ES348151A1 (en) 1969-03-16
BE707876A (en) 1968-06-12
US3505557A (en) 1970-04-07
DE1541026A1 (en) 1969-09-25
DE1541026B2 (en) 1971-08-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees