GB833432A - Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor - Google Patents

Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor

Info

Publication number
GB833432A
GB833432A GB1841655A GB1841655A GB833432A GB 833432 A GB833432 A GB 833432A GB 1841655 A GB1841655 A GB 1841655A GB 1841655 A GB1841655 A GB 1841655A GB 833432 A GB833432 A GB 833432A
Authority
GB
United Kingdom
Prior art keywords
cathode
heater
indirectly heated
relating
heater elements
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
GB1841655A
Inventor
Bernard Joseph Mayo
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1841655A priority Critical patent/GB833432A/en
Priority to FR1152794D priority patent/FR1152794A/en
Publication of GB833432A publication Critical patent/GB833432A/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
    • H01J1/22—Heaters

Abstract

833,432. Thermionic cathode constructions. ELECTRIC & MUSICAL INDUSTRIES Ltd. June 11, 1956 [June 25, 1955], No. 18416/55. Class 39(1). [Also in Group XI] A filamentary heater for an indirectly heated cathode, initially bent so as to provide two parallel conductors, is twisted so as to transpose parts of the conductors at one or more positions, Fig. 2, so that in the oppositely disposed portions the current flow in opposite directions. The heater of Fig. 2 may be inserted into a cathode sleeve, or bent round into a spiral, Fig. 3. Fig. 4 shows the spiral heater of Fig. 3 mounted between a concave cathode surface 12 and a rearward cup 8 which is welded to the cathode as at 9, and has a stem 10 passing through a supporting insulator 5. The whole cathode structure is secured inside a shield 13. According to the Provisional Specification such a filament can also be used as a directlyheated cathode.
GB1841655A 1955-06-25 1955-06-25 Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor Expired GB833432A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1841655A GB833432A (en) 1955-06-25 1955-06-25 Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor
FR1152794D FR1152794A (en) 1955-06-25 1956-06-22 Improvements to heating elements for electron tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1841655A GB833432A (en) 1955-06-25 1955-06-25 Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor

Publications (1)

Publication Number Publication Date
GB833432A true GB833432A (en) 1960-04-27

Family

ID=10112066

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1841655A Expired GB833432A (en) 1955-06-25 1955-06-25 Improvements in or relating to indirectly heated cathodes for electron discharge devices and to heater elements therefor

Country Status (2)

Country Link
FR (1) FR1152794A (en)
GB (1) GB833432A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147732A (en) * 1983-10-07 1985-05-15 English Electric Valve Co Ltd Improvements in or relating to travelling wave tubes
GB2192751A (en) * 1986-07-14 1988-01-20 Denki Kagaku Kogyo Kk Thermionic cathode structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569768A (en) * 1968-11-21 1971-03-09 Sylvania Electric Prod Cathode sleeve effecting maximum heat transfer to top of cathode cap and minimum to cap wall
DE10211947A1 (en) * 2002-03-18 2003-10-16 Siemens Ag Thermionic emitter, especially for x-ray tubes, has magnetic field compensation arrangement with current generating magnetic field that substantially compensates field generated by heating current

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147732A (en) * 1983-10-07 1985-05-15 English Electric Valve Co Ltd Improvements in or relating to travelling wave tubes
US4658181A (en) * 1983-10-07 1987-04-14 English Electric Valve Company Limited Travelling wave tubes
GB2192751A (en) * 1986-07-14 1988-01-20 Denki Kagaku Kogyo Kk Thermionic cathode structure
US4878866A (en) * 1986-07-14 1989-11-07 Denki Kagaku Kogyo Kabushiki Kaisha Thermionic cathode structure
GB2192751B (en) * 1986-07-14 1991-02-13 Denki Kagaku Kogyo Kk Method of making a thermionic cathode structure.

Also Published As

Publication number Publication date
FR1152794A (en) 1958-02-25

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