GB806112A - Improvements in and relating to cathodes for electric discharge devices - Google Patents

Improvements in and relating to cathodes for electric discharge devices

Info

Publication number
GB806112A
GB806112A GB1056654A GB1056654A GB806112A GB 806112 A GB806112 A GB 806112A GB 1056654 A GB1056654 A GB 1056654A GB 1056654 A GB1056654 A GB 1056654A GB 806112 A GB806112 A GB 806112A
Authority
GB
United Kingdom
Prior art keywords
helix
mandrel
coiled
coil
diameter
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
GB1056654A
Inventor
Douglas Thomas Waigh
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB1056654A priority Critical patent/GB806112A/en
Publication of GB806112A publication Critical patent/GB806112A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode

Landscapes

  • Discharge Lamp (AREA)

Abstract

806,112. Cathode constructions and materials. THORN ELECTRICAL INDUSTRIES Ltd. March, 30 1955, [April 9, 1954], No. 10566/54. Drawings to Specification. Class 39(1). A coreless, coiled-coil cathode for an electric discharge device, especially a fluorescent discharge lamp, comprises a plurality of wires alongside one another formed into a coreless helix which is itself coiled into a helix, and coated with electron-emitting material. The primary helix contains no core of wire and is not overwound by any other wire. In one example two wires of tungsten 0À075 mm. diameter are wound parallel to and in contact with each other or twisted together, upon a mandrel of molybdenum 0À25 mm. diameter. The primary helix so formed and while still upon the mandrel is wound upon a mandrel 1À19 mm. diameter to form a secondary helix. After removal from the second mandrel the coiled-coil is set by sintering at a temperature of about 1500‹C. and the molybdenum mandrel is then dissolved away by nitric acid with or without sulphuric acid. The coiled-coil is then coated with an electron-emissive material, such as a mixture of barium, strontium and calcium carbonates in proportions of about 55 : 45 : 10 by weight, by dipping into a suspension of the powdered materials in a suspending medium. The space within the primary helix is filled as far as possible with the materials but not the space within the secondary helix. Specification 792,365 is referred to.
GB1056654A 1954-04-09 1954-04-09 Improvements in and relating to cathodes for electric discharge devices Expired GB806112A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1056654A GB806112A (en) 1954-04-09 1954-04-09 Improvements in and relating to cathodes for electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1056654A GB806112A (en) 1954-04-09 1954-04-09 Improvements in and relating to cathodes for electric discharge devices

Publications (1)

Publication Number Publication Date
GB806112A true GB806112A (en) 1958-12-17

Family

ID=9970211

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1056654A Expired GB806112A (en) 1954-04-09 1954-04-09 Improvements in and relating to cathodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB806112A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073986A (en) * 1960-04-20 1963-01-15 Gen Electric Electric incandescent lamp
GB2492854A (en) * 2011-07-13 2013-01-16 Sang Il System Co Ltd Cold cathode fluorescent lamp for illumination

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073986A (en) * 1960-04-20 1963-01-15 Gen Electric Electric incandescent lamp
GB2492854A (en) * 2011-07-13 2013-01-16 Sang Il System Co Ltd Cold cathode fluorescent lamp for illumination

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