GB597470A - Improvements in or relating to the mounting of indirectly heated cathodes for electron discharge tubes - Google Patents

Improvements in or relating to the mounting of indirectly heated cathodes for electron discharge tubes

Info

Publication number
GB597470A
GB597470A GB21307/45A GB2130745A GB597470A GB 597470 A GB597470 A GB 597470A GB 21307/45 A GB21307/45 A GB 21307/45A GB 2130745 A GB2130745 A GB 2130745A GB 597470 A GB597470 A GB 597470A
Authority
GB
United Kingdom
Prior art keywords
tube
nickel
indirectly heated
relating
mounting
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
GB21307/45A
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 Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB597470A publication Critical patent/GB597470A/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
    • H01J1/26—Supports for the emissive material

Landscapes

  • Discharge Lamp (AREA)

Abstract

597,470. Thermionic cathodes. PHILIPS LAMPS, Ltd. Aug. 21, 1945, No. 21307. Convention date, June 5, 1940. [Class 39 (i)] An indirectly heated cathodewherein the emitting layer is carried on a tube 7 of nickel or other material of high thermal conductivity, is mounted in mica spacers 2, 3 by a tube 4 within the nickel tube or by cuffs or short projecting tubes entering the ends of the tube 7. This supporting means is of nickel iron, nickel chromium or other alloy of low thermal conductivity, so that the temperature drop along the protruding ends is at least 300‹ C. over a length of 2 mm. with a working temperature of 760-980‹ C. of the emitting portion. The heater is within the tube and extends only as far as the emitting layer. The subjectmatter is identical with that of Specification 550,733.
GB21307/45A 1940-06-05 1945-08-21 Improvements in or relating to the mounting of indirectly heated cathodes for electron discharge tubes Expired GB597470A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL50640X 1940-06-05

Publications (1)

Publication Number Publication Date
GB597470A true GB597470A (en) 1948-01-27

Family

ID=19756154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21307/45A Expired GB597470A (en) 1940-06-05 1945-08-21 Improvements in or relating to the mounting of indirectly heated cathodes for electron discharge tubes

Country Status (5)

Country Link
BE (1) BE441617A (en)
CH (1) CH225248A (en)
FR (1) FR872829A (en)
GB (1) GB597470A (en)
NL (1) NL54119C (en)

Also Published As

Publication number Publication date
CH225248A (en) 1943-01-15
FR872829A (en) 1942-06-19
BE441617A (en)
NL54119C (en)

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