GB857090A - Improvements in or relating to thermionic dispenser cathodes - Google Patents

Improvements in or relating to thermionic dispenser cathodes

Info

Publication number
GB857090A
GB857090A GB32781/57A GB3278157A GB857090A GB 857090 A GB857090 A GB 857090A GB 32781/57 A GB32781/57 A GB 32781/57A GB 3278157 A GB3278157 A GB 3278157A GB 857090 A GB857090 A GB 857090A
Authority
GB
United Kingdom
Prior art keywords
partition
support
relating
oct
porous
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
GB32781/57A
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 Electrical Industries Ltd
Original Assignee
Philips Electrical 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 Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB857090A publication Critical patent/GB857090A/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

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

857,090. Thermionic cathode constructions. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 21, 1957 [Oct. 24, 1956], No. 32781/57. Class 39(1). A dispenser cathode has a porous refractory metal body 10, in or behind which is located the emissive material, and a hollow support member 15 within which is the heater 20; the two are separated by a partition 16 to prevent backward emission, the partition being of greater diameter than the support. The migration path is long enough to prevent such migration. The support member 15 may be made with a lap joint, Fig. 2 (not shown), and the support, partition, and porous member may all be welded together in a single operation. The partition may be dished, so that it makes line contact only with the porous member.
GB32781/57A 1956-10-24 1957-10-21 Improvements in or relating to thermionic dispenser cathodes Expired GB857090A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US618072A US2869017A (en) 1956-10-24 1956-10-24 Thermionic dispenser cathode

Publications (1)

Publication Number Publication Date
GB857090A true GB857090A (en) 1960-12-29

Family

ID=24476212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32781/57A Expired GB857090A (en) 1956-10-24 1957-10-21 Improvements in or relating to thermionic dispenser cathodes

Country Status (7)

Country Link
US (1) US2869017A (en)
BE (1) BE561832A (en)
CH (1) CH355529A (en)
DE (1) DE1042136B (en)
FR (1) FR1185028A (en)
GB (1) GB857090A (en)
NL (1) NL100722C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127617A (en) * 1981-12-11 1984-04-11 Tokyo Shibaura Electric Co Cathode structure for electron tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE564257A (en) * 1957-01-26
KR930007461B1 (en) * 1991-04-23 1993-08-11 주식회사 금성사 Method of making a dispenser type cathode
US5114742A (en) * 1991-07-17 1992-05-19 The United States Of America As Represented By The Secretary Of The Army Preparing a scandate cathode by impregnating a porous tungsten billet with Ba3 Al2 O6, coating the top surface with a mixture of Sc6 WO12, Sc2 (WO4)3, and W in a 1:3:2 mole ratio, and heating in a vacuum

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498869A (en) * 1949-10-25
BE512852A (en) * 1951-07-17
NL174029B (en) * 1951-11-29 Joseph Salim Peress HOLLOW ARTICLES FOR FOR EXAMPLE A DIVING SUIT.
NL96177C (en) * 1952-02-27
CH315203A (en) * 1952-03-24 1956-07-31 Siemens Ag Cathode for electrical discharge vessels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127617A (en) * 1981-12-11 1984-04-11 Tokyo Shibaura Electric Co Cathode structure for electron tube
US4524296A (en) * 1981-12-11 1985-06-18 Tokyo Shibaura Denki Kabushiki Kaisha Cathode structure for electron tube

Also Published As

Publication number Publication date
FR1185028A (en) 1959-07-29
CH355529A (en) 1961-07-15
BE561832A (en)
NL100722C (en)
DE1042136B (en) 1958-10-30
US2869017A (en) 1959-01-13

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