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1. (WO1991017559) GRID AMPLIFICATION TUBE WITH VARYING WIDTH BARS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017559 International Application No.: PCT/FR1991/000334
Publication Date: 14.11.1991 International Filing Date: 23.04.1991
IPC:
H01J 1/46 (2006.01) ,H01J 19/38 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
1
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
46
Control electrodes, e.g. grid; Auxiliary electrodes
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
19
Details of vacuum tubes of the types covered by group H01J21/82
28
Non-electron-emitting electrodes; Screens
38
Control electrodes, e.g. grid
Applicants:
THOMSON TUBES ELECTRONIQUES [FR/FR]; 38, rue Vauthier F-92100 Boulogne-Billancourt, FR (AllExceptUS)
TARDY, Michel, Pierre [FR/FR]; FR (UsOnly)
BUGE, Jean-Pierre [FR/FR]; FR (UsOnly)
Inventors:
TARDY, Michel, Pierre; FR
BUGE, Jean-Pierre; FR
Agent:
GUERIN, Michel; Thomson-CSF S.C.P.I. F-92045 Paris-La Défense Cédex 67, FR
Priority Data:
90/0564004.05.1990FR
Title (EN) GRID AMPLIFICATION TUBE WITH VARYING WIDTH BARS
(FR) TUBE D'AMPLIFICATION A GRILLE AVEC BARREAUX DE LARGEUR VARIABLE
Abstract:
(EN) The invention relates to electron power tubes with grid. For high powers and high energies, very high, localized heating of the grid takes place due to the high currents. It is the case for example for the screen grid (grid G2) of meshed grid tetrodes with vertical or oblique bars (20, 22) of pyrolytic graphite. In order to improve the operational reliability and the life of the tube, the invention proposes to use grid bars having a larger width at the bottom of the grid, where the high frequency currents are at their highest.
(FR) L'invention concerne les tubes électroniques de puissance à grille. Pour de fortes puissances et des hautes fréquences un échauffement très important et localisé de la grille se produit sous l'effet des courants élevés. C'est le cas par exemple pour la grille-écran (grille G2) des tétrodes à grille maillée à barreaux verticaux ou obliques (20, 22) en graphite pyrolytique. Pour améliorer la fiabilité de fonctionnement et la durée de vie du tube, on propose selon l'invention de donner aux barreaux de la grille une largeur plus importante dans le bas de la grille, là où les courants haute fréquence sont les plus importants.
Designated States: JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: French (FR)
Filing Language: French (FR)
Also published as:
EP0481052US5317230JPH05501635DE000069108666FR2661778