GB675163A - Improvements in or relating to vacuum electric discharge tubes - Google Patents

Improvements in or relating to vacuum electric discharge tubes

Info

Publication number
GB675163A
GB675163A GB12237/47A GB1223747A GB675163A GB 675163 A GB675163 A GB 675163A GB 12237/47 A GB12237/47 A GB 12237/47A GB 1223747 A GB1223747 A GB 1223747A GB 675163 A GB675163 A GB 675163A
Authority
GB
United Kingdom
Prior art keywords
electrode
relating
emitting
mixture
electric discharge
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
GB12237/47A
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 GB675163A publication Critical patent/GB675163A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Discharge Lamp (AREA)

Abstract

675,163. Electrode materials. PHILIPS LAMPS, Ltd. May 6. 1947 [Dec. 14, 1944], No. 12237/47. Class 39 (i). To maintain constant the operation of an electrode emitting secondary electrons, such as the grid of a transmitting valve designed to emit secondary electrons in a one-to-one ratio and so to receive a net current of zero, the electrode has a coating of a mixture of secondary emitting material such as one or both of the oxides of magnesium and beryllium, and a material of good heat-radiating properties such as carbon or black oxides of titanium, molybdenum, zirconium, or tungsten. The heatradiating material ensures the maintenance of the electrode at a low temperature. A mixture of soot and magnesia may be applied to the electrode by means of a suspension. Part of the electrode may be left uncoated, or may be coated only with secondary-emitting material, or only with heat-radiating material.
GB12237/47A 1944-12-14 1947-05-06 Improvements in or relating to vacuum electric discharge tubes Expired GB675163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE675163X 1944-12-14

Publications (1)

Publication Number Publication Date
GB675163A true GB675163A (en) 1952-07-09

Family

ID=3877570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12237/47A Expired GB675163A (en) 1944-12-14 1947-05-06 Improvements in or relating to vacuum electric discharge tubes

Country Status (1)

Country Link
GB (1) GB675163A (en)

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