GB1378733A - Indirectly heated type cathode devices - Google Patents

Indirectly heated type cathode devices

Info

Publication number
GB1378733A
GB1378733A GB2022273A GB2022273A GB1378733A GB 1378733 A GB1378733 A GB 1378733A GB 2022273 A GB2022273 A GB 2022273A GB 2022273 A GB2022273 A GB 2022273A GB 1378733 A GB1378733 A GB 1378733A
Authority
GB
United Kingdom
Prior art keywords
mixture
heater
substrate
casing
april
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
GB2022273A
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric 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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Publication of GB1378733A publication Critical patent/GB1378733A/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
    • H01J1/24—Insulating layer or body located between heater and emissive material

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1378733 Thermionic cathode constructions TOKYO SHIBAURA ELECTRIC CO Ltd 27 April 1973 [28 April 1972] 20222/73 Heading H1D An indirectly heated cathode comprises a hollow casing 1 containing a mixture 3, 4 of a metal and an insulating and heat resistive material, an emissive substrate 2 mounted at one end of the casing and a metal foil heater 5 embedded in the mixture and spaced from the substrate. A concave porous disc 2 is brazed to a Mo cylinder and covered with a layer 4 of the mixture. A flat spiral W foil heater 5 is added and covered with a mixture of Al 2 O 3 and Mo powders. This is compressed with a die 6 and sintered. The inner surface of substrate 2 and the heater may both be concave. The mixture may comprise Y 2 O 3 , ZrO, HfO 2 , BeO 2 , MgO or a rare earth oxide and W, Ni, Re, Ta, Ti, Zr, Hf, V, Nb, Cr or elements of the Pt group. The cylinder may be coated with Ru-Mo alloy. The heater may comprise one spiral or two interleaved spirals joined at their centres. It is etched from sheet then shaped under pressure at 1700‹ C. It may be coated with an insulating oxide film. A thin heater permits the use of a shorter casing thereby reducing heat losses and shortening starting time. The cathode is used in klystrons and travelling wave tubes.
GB2022273A 1972-04-28 1973-04-27 Indirectly heated type cathode devices Expired GB1378733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4278772A JPS495262A (en) 1972-04-28 1972-04-28

Publications (1)

Publication Number Publication Date
GB1378733A true GB1378733A (en) 1974-12-27

Family

ID=12645661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2022273A Expired GB1378733A (en) 1972-04-28 1973-04-27 Indirectly heated type cathode devices

Country Status (3)

Country Link
US (1) US3803441A (en)
JP (1) JPS495262A (en)
GB (1) GB1378733A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268325A (en) * 1992-07-01 1994-01-05 Thorn Emi Electronics Ltd Thermionic cathode structure.

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU179748B (en) * 1974-01-15 1982-12-28 Ferenc Puskas Cathode of a metal ceramic sintered body produced by dust metalurgy for closing discharge tube of sodium vapour lamp and process for the production thereof
JPS5525066B2 (en) * 1974-10-30 1980-07-03
US4268775A (en) * 1978-03-13 1981-05-19 Anthony J. Barraco Cathode-heater assembly and support structure therefor
FR2476386A1 (en) * 1980-02-15 1981-08-21 Thomson Csf INDIRECT HEATING CATHODE HEATING ELEMENT, METHOD OF MANUFACTURING THE SAME, AND INDIRECT HEATING CATHODE COMPRISING SUCH A MEMBER
NL8100928A (en) * 1981-02-26 1982-09-16 Philips Nv OXYD CATHODE.
US5350969A (en) * 1991-12-03 1994-09-27 Litton Systems, Inc. Cathode heater and cathode assembly for microwave power tubes
CN102446680A (en) * 2010-10-13 2012-05-09 北京中科信电子装备有限公司 Novel emission electron cathode for effectively increasing multi-charge ion yield
FR2997548A1 (en) * 2012-10-26 2014-05-02 Thales Sa FAST-START THERMOELECTRONIC EMISSION CATHODE AND PROCESS FOR PREPARING THE SAME

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS433701Y1 (en) * 1967-07-26 1968-02-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268325A (en) * 1992-07-01 1994-01-05 Thorn Emi Electronics Ltd Thermionic cathode structure.
GB2268325B (en) * 1992-07-01 1996-01-03 Thorn Emi Electronics Ltd Thermionic cathode structure

Also Published As

Publication number Publication date
DE2321516B2 (en) 1976-01-08
US3803441A (en) 1974-04-09
JPS495262A (en) 1974-01-17
DE2321516A1 (en) 1973-11-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee