GB655566A - Improvements in or relating to the manufacture of thermionic valves - Google Patents

Improvements in or relating to the manufacture of thermionic valves

Info

Publication number
GB655566A
GB655566A GB3085447A GB3085447A GB655566A GB 655566 A GB655566 A GB 655566A GB 3085447 A GB3085447 A GB 3085447A GB 3085447 A GB3085447 A GB 3085447A GB 655566 A GB655566 A GB 655566A
Authority
GB
United Kingdom
Prior art keywords
filament
spring
welded
wire
filament wire
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
GB3085447A
Inventor
Norman Edward Hugo Pearson
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.)
Hivac Ltd
Original Assignee
Hivac 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 Hivac Ltd filed Critical Hivac Ltd
Priority to GB3085447A priority Critical patent/GB655566A/en
Publication of GB655566A publication Critical patent/GB655566A/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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

655,566. Thermionic valves. HIVAC, Ltd. Nov. 20, 1947, No. 30854. [Class 39 (i)] In a filament mounting arrangement for a thermionic valve, of the type in which the anode comprises opposed parallel planar surfaces on either side of the filament whereby the principal direction of electron travel when the valve is in operation is substantially normal to said planar anode surfaces, a single limb filament wire is held under tension by its attachment at one end to a spring which is formed as a strip of metal whose cross-section has a width dimension several times greater than its thickness, said spring being of generally flat or only slightly bowed form and being disposed so as to lie with its length dimension substantially at right angles to the filament wire, and its width dimension substantially at right angles to the filament wire and parallel to said principal direction of electron travel. The filament wire 10 is held between a fixed support lug 11 and a cantilever spring 12 and passes through triangular holes in mica spacing plates 13 and 14, provided with projections 27 to locate the electrode assembly in the surrounding envelope. Support-lug 11 is a substantially L-shaped metal stamping, rigidly secured by means of bent-over tongues 18 to the lowermost of two superposed mica layers forming the lower spacing plate 14. Two layers of mica are used so that the lower edge of the anode (not shown) will be insulated from the tongues 18. The filament is connected, for example by welding, to the lug 11 through the intermediary of a metal tag 19, to which is also welded the end of a connecting-wire 20. The spring 12 has a downturned portion 21 to which is welded a metal tag 22 connected, as by welding, to the filament wire, and is welded at its opposite end to one limb of a U-shaped metal plate 23, the other limb of which is welded to one of the support rods 24 of the suppressor grid structure. The position and tension of the spring 12 may be adjusted by bending the plate 23. In a possible modification, the tensioning spring is connected at each end to fixed members and the filament wire is attached to its centre.
GB3085447A 1947-11-20 1947-11-20 Improvements in or relating to the manufacture of thermionic valves Expired GB655566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3085447A GB655566A (en) 1947-11-20 1947-11-20 Improvements in or relating to the manufacture of thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3085447A GB655566A (en) 1947-11-20 1947-11-20 Improvements in or relating to the manufacture of thermionic valves

Publications (1)

Publication Number Publication Date
GB655566A true GB655566A (en) 1951-07-25

Family

ID=10314174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3085447A Expired GB655566A (en) 1947-11-20 1947-11-20 Improvements in or relating to the manufacture of thermionic valves

Country Status (1)

Country Link
GB (1) GB655566A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1038660B (en) * 1954-09-25 1958-09-11 Telefunken Gmbh Method for tensioning the thread of a directly or indirectly heated cathode of an electron tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1038660B (en) * 1954-09-25 1958-09-11 Telefunken Gmbh Method for tensioning the thread of a directly or indirectly heated cathode of an electron tube

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