EP0007865A1 - Electron tube with a cylindrical pyrolytic graphite grid - Google Patents

Electron tube with a cylindrical pyrolytic graphite grid Download PDF

Info

Publication number
EP0007865A1
EP0007865A1 EP79400518A EP79400518A EP0007865A1 EP 0007865 A1 EP0007865 A1 EP 0007865A1 EP 79400518 A EP79400518 A EP 79400518A EP 79400518 A EP79400518 A EP 79400518A EP 0007865 A1 EP0007865 A1 EP 0007865A1
Authority
EP
European Patent Office
Prior art keywords
grid
mast
pyrolytic graphite
blades
contact
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.)
Granted
Application number
EP79400518A
Other languages
German (de)
French (fr)
Other versions
EP0007865B1 (en
Inventor
Roger Hoet
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.)
Thales SA
Thomson CSF Scpi
Original Assignee
Thomson CSF Scpi
Thomson CSF SA
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 Thomson CSF Scpi, Thomson CSF SA filed Critical Thomson CSF Scpi
Publication of EP0007865A1 publication Critical patent/EP0007865A1/en
Application granted granted Critical
Publication of EP0007865B1 publication Critical patent/EP0007865B1/en
Expired legal-status Critical Current

Links

Images

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
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/48—Mountings for individual electrodes
    • 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
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/38—Control electrodes, e.g. grid

Definitions

  • the invention relates to electronic tubes with coaxial cylindrical electrodes comprising at least one grid in pyrolytic graphite.
  • the subject of the invention is in particular the mounting of such a grid when it is necessary to have, in addition to the electrical connection of the lower end of the grid with the base of the tube, a second connection electric at the upper end of the grid, in particular to allow the mounting of the "cathode to ground” tube, according to the arrangement described in French patent 70 43 740, in which the upper end of the grid is connected to a conductor central, or mast, crossing the electrodes.
  • the central conductive mast is in contact with the grid by means of a set of graphite blades regularly distributed over a circular periphery. It possibly carries on its upper part a conductive disc either of metal or of graphite.
  • the electronic tubes with cylindrical electrodes comprise . both a central mast at one end of which is connected a grid in pyrolytic graphite, are characterized by the combination of a circular opening at the top of the grid and a set of graphite blades, solidiary or not of the grid, through which the contact takes place between the mast and the upper part of the body of the grid.
  • said set of graphite blades is made on the periphery of the conical skirt of a flat-bottomed pyrolytic graphite bell; the bell is fixed by its bottom to the mast or to the disc fixed to the upper part of this, preferably a metal disc, and the grid is then lowered onto the bell, the diameter of the upper bore of the grid being between the extreme diameters of the bell.
  • the blades are produced on the upper part of the grid itself, part which is then conical, and bears directly on the disc, then preferably in pyrolytic graphite itself .
  • the grid-mast contact direct or not, is an elastic contact, uniformly distributed, well accommodating the differences in expansion between these two elements at operating temperature.
  • FIG. 1 in diagrammatic vertical section, we see in 1 a pyrolytic graphite grid connected according to the invention to the upper part of the conductive mast 5.
  • the grid has at its base a sleeve 1.1. fitted onto the metal crown 3, itself mounted on the base 4; we have voluntarily omitted all the details concerning this part of the grid, its machining, its fixing, as external to the invention.
  • a disc 5.1 On the upper part of the central mast 5 is fixed a disc 5.1. whose outside diameter is less than that of the grid bore. This disc has a series of tapped holes 5.1.1. It is made of metal.
  • the bottom of the bell has a circular bore 6.1, by which it engages on the plate 5.1. ; it is provided with expansion slots 6.2., four in the example shown.
  • the skirt 6.3. of the frustoconical bell has slots 6.4. regularly distributed around its periphery and defining a set of blades 6.5.
  • the diameter of the upper grid bore is between the extreme diameters of the skirt conical as shown in detail in Figure 3; the grid is lowered onto the bell on which it comes to press elastically thanks to the blades 6.5 which it tightens slightly, without any risk of sticking or sintering because the contact is made graphite on graphite.
  • the bell also has holes 6.6. fixing on the plate 5.1.
  • the fixing screws are represented shunts constituted by tantalum blades fixed at one of their ends under the heads of the screws 7 and welded to the other on the mast.
  • the mounting can still be completed by shunts 9 similar to shunts 8, welded on the one hand to the base 4 and taken on the other hand under the fixing screws 1.1.1 of the grid on the crown 3, according to an arrangement otherwise known.
  • the upper part of the grid assumes the shape of a conical skirt 1.4. cut into strips 1.6. by slots 1.5. ; in this variant the 5.1 disc. is preferably graphite; it has rounded edges.
  • This assembly which has the same advantages as the previous one, is simpler but it requires that the grid be machined specially for this purpose, so as to present the strips 1.6.5.2. shows a central fixing screw for the 5.1 f graphite disc on the mast 5.
  • Figure 5 is an overall sectional view of a lamp with four electrodes or tetrode, comprising a screen grid 1 mounted like that of the variant of FIG. 1.
  • the cathode carrying the reference 10 a first control grid, arranged inside the grid 1 and bearing the reference 50, the designated anode by the mark 2 and the queusot 20 of the vacuum enclosure.
  • the figure also shows in its lower part the metal cups 41 to 45 for connection of the different electrodes to the voltage sources, not shown, which supply them, cups isolated from each other by shims of insulating material 46.
  • the references 30 and 40 respectively designate a radiator and a protective cover.
  • a grid 200 mm high and 90 mm in diameter in its central part has been mounted with a bell having a diameter of 31 mm at its base and a slope of 2 ° 30 for a total height of 10 mm; the height of the slots was 7 mm and the central bore of the bell 15 mm.
  • the grid bore was slightly less than the previous diameter.
  • the disc 5.1 instead of being attached and fixed to the central conductor 5, can be an integral part of it or welded onto it.

Abstract

L'invention concerne les tubes électroniques à grille en graphite pyrolytique. La connexion de la grille 1 avec la partie supérieure du mât conducteur central 5 est réalisée par l'intermédiaire d'une cloche 6 en graphite pyrolytique elle aussi, dont la jupe conique est découpée en lamelles, et qui est fixée par son fond sur le disque 5.1 solidaire du mât. Application notamment aux lampes triodes de puissance des émetteurs radioélectriques.The invention relates to electronic tubes with a pyrolytic graphite grid. The connection of the grid 1 with the upper part of the central conductive mast 5 is carried out by means of a bell 6 also made of pyrolytic graphite, the conical skirt of which is cut into strips, and which is fixed by its bottom to the 5.1 disc secured to the mast. Application in particular to triode power lamps of radio transmitters.

Description

L'invention concerne les tubes électroniques à électrodes cylindriques coaxiales comportant au moins une grille en graphite pyrolytique.The invention relates to electronic tubes with coaxial cylindrical electrodes comprising at least one grid in pyrolytic graphite.

L'invention a pour objet en.particulier le montage d'une telle grille lorsqu'il est nécessaire d'avoir, en plus de la connexion électrique de l'extrémité inférieure de la grille avec `l'embase du tube, une seconde connexion électrique à l'extrémité supérieure de la grille, notamment pour permettre le montage du tube "cathode à la masse", suivant la disposition décrite dans le brevet français 70 43 740, dans lequel l'extrémité supérieure de la grille est connectée à un conducteur central, ou mât, traversant les électrodes.The subject of the invention is in particular the mounting of such a grid when it is necessary to have, in addition to the electrical connection of the lower end of the grid with the base of the tube, a second connection electric at the upper end of the grid, in particular to allow the mounting of the "cathode to ground" tube, according to the arrangement described in French patent 70 43 740, in which the upper end of the grid is connected to a conductor central, or mast, crossing the electrodes.

De telles grilles en graphite pyrolytique (dit encore graphite orienté) ont été décrites, notamment dans plusieurs brevets déposés au nom de la demanderesse, par exemple les brevets français 1 523 248 et 1 344 220.Such grids made of pyrolytic graphite (also called oriented graphite) have been described, in particular in several patents filed in the name of the applicant, for example French patents 1,523,248 and 1,344,220.

Leur montage et leur fixation ont fait l'objet d'une demande de brevet déposée par la demanderesse le 23 Juin 1978, sous le numéro 78 18 834 concernant un procédé qui permet de résoudre les problèmes tant mécaniques que thermiques (différences des dilatations de la grille et de l'embase notamment) et électriques, lorsqu'il suffit que la grille ne comporte qu'une seule connexion électrique, c'est-à-dire lorsque l'on peut se contenter d'un montage du tube du type dit "grille à la masse".Their mounting and fixing were the subject of a patent application filed by the plaintiff on June 23, 1978, under the number 78 18 834 concerning a process which makes it possible to solve both mechanical and thermal problems (differences in the expansion of the grid and the base in particular) and electrical, when it suffices that the grid has only one electrical connection, that is to say when one can be satisfied with mounting the tube of the so-called type "ground grid".

Cependant, dans le cas de grilles en graphite pyrolytique, lorsque, pour augmenter le gain en puissance du tube par exemple, on est conduit à adopter pour le tube le montage dit "cathode à la masse", dont il a été question plus haut, avec conducteur central, la liaison de la grille avec l'extrémité supérieure de ce conducteur, c'est-à-dire son extrémité opposée à celle par laquelle il traverse l'embase, pose un problème analogue à celui de la fixation de la grille à l'embase. Cette liaison doit permettre d'absorber les écarts de dilatation entre la grille et le conducteur central, écarts qui peuvent être très importants si le mât est en métal (mobybdène par exemple); les contraintes tant longitudinales que transversales doivent être évitées car elles entraîneraient des déformations de la grille et son décentrage.However, in the case of pyrolytic graphite grids, when, to increase the power gain of the tube for example, we are led to adopt for the tube the so-called "cathode to the mass ", which was discussed above, with central conductor, the grid connection with the upper end of this conductor, that is to say its end opposite to that by which it crosses the base, poses a problem similar to that of fixing the grid to the base. This connection must make it possible to absorb the differences in expansion between the grid and the central conductor, differences which can be very significant if the mast is made of metal (mobybdenum by example); both longitudinal and transverse stresses should be avoided because they would cause deformations of the grid and its off-center.

Suivant l'invention, le mât conducteur central est en contact avec la grille par l'intermédiaire d'un ensemble de lames en graphite régulièrement réparties sur un pourtour circulaire. Il porte éventuellement à sa partie supérieure un disque conducteur soit en métal, soit en graphite.According to the invention, the central conductive mast is in contact with the grid by means of a set of graphite blades regularly distributed over a circular periphery. It possibly carries on its upper part a conductive disc either of metal or of graphite.

Plus précisément, les tubes électroniques à électrodes cylindriques suivant l'invention, compor- . tant un mât central à l'une des-extrémités duquel est connectée une grille en graphite pyrolytique, sont caractérisés par la combinaison d'une ouverture circulaire à la partie supérieure de la grille et d'un ensemble de lames de graphite, solidiaire ou non de la grille, par lequel a lieu le contact entre le mât et la partie supérieure du corps de la grille.More specifically, the electronic tubes with cylindrical electrodes according to the invention, comprise . both a central mast at one end of which is connected a grid in pyrolytic graphite, are characterized by the combination of a circular opening at the top of the grid and a set of graphite blades, solidiary or not of the grid, through which the contact takes place between the mast and the upper part of the body of the grid.

Suivant un mode préféré de mise en oeuvre de l'invention, qui permet d'utiliser une grille monobloc en graphite pyrolytique ayant subi l'usinage standard, ledit ensemble de lames de graphite est réalisé sur le pourtour de la jupe conique d'une cloche en graphite pyrolytique à fond plat ; la cloche est fixée par son fond sur le mât ou sur le disque fixé à la partie supérieure de clui-ci, disque de préférence en métal, et la grille est ensuite descendue sur la cloche, le diamètre de l'alésage supérieur de la grille étant compris entre les diamètres extrêmes de la cloche.According to a preferred embodiment of the invention, which makes it possible to use a one-piece grid of pyrolytic graphite having undergone standard machining, said set of graphite blades is made on the periphery of the conical skirt of a flat-bottomed pyrolytic graphite bell; the bell is fixed by its bottom to the mast or to the disc fixed to the upper part of this, preferably a metal disc, and the grid is then lowered onto the bell, the diameter of the upper bore of the grid being between the extreme diameters of the bell.

Suivant un autre mode de mise en oeuvre de l'invention, les lames sont réalisées sur la partie supérieure de la grille elle-même, partie qui est alors conique, et appuie directement sur le disque, alors de préférence en graphite pyrolytique lui- aussi.According to another embodiment of the invention, the blades are produced on the upper part of the grid itself, part which is then conical, and bears directly on the disc, then preferably in pyrolytic graphite itself .

Dans tous les cas, le contact grille-mât, direct ou non, est un contact élastique, uniformément réparti, accommodant bien les différences de dilatation entre ces deux éléments à la température de fonctionnement.In all cases, the grid-mast contact, direct or not, is an elastic contact, uniformly distributed, well accommodating the differences in expansion between these two elements at operating temperature.

La fixation de la grille, et la connexion électrique à son autre extrémité, c'est-à-dire son extrémité inférieure, sont par exemple avantageusement réalisées de la manière indiquée dans la demande de brevet déjà citée.The attachment of the grid, and the electrical connection at its other end, that is to say its lower end, are for example advantageously carried out in the manner indicated in the patent application already cited.

L'invention sera mieux comprise à la lecture de la description qui suit et des figures qui s'y rapportent parmi lesquelles :

  • - la figure 1 montre en coupe axiale schématique un premier exemple de mise en oeuvre de l'in- tion ;
  • - la figure 2 est une vue agrandie d'un des éléments de la figure 1 ;
  • - la figure 3 est une vue en coupe de la partie supérieure de la grille de la figure 1 ;
  • - la figure 4 montre, également en coupe axiale schématique, un second exemple de mise en oeuvre de l'invention ; 1
  • - la figure 5 est une vue d'ensemble en coupe d'un tube électronique comportant une grille conforme à celle de la figure 1.
The invention will be better understood on reading the description which follows and the figures relating to it, among which:
  • - Figure 1 shows in schematic axial section a first example of implementation of the invention;
  • - Figure 2 is an enlarged view of one of the elements of Figure 1;
  • - Figure 3 is a sectional view of the upper part of the grid of Figure 1;
  • - Figure 4 shows, also in axial section schematic, a second example of implementation of the invention; 1
  • FIG. 5 is an overall sectional view of an electronic tube comprising a grid conforming to that of FIG. 1.

On voit à la figure 1, en coupe verticale schématique, en 1 une grille en graphite pyrolytique connectée suivant l'invention à la partie supérieure du mât conducteur 5.In FIG. 1, in diagrammatic vertical section, we see in 1 a pyrolytic graphite grid connected according to the invention to the upper part of the conductive mast 5.

La grille comporte à sa base un manchon 1.1. emboîté sur la couronne métallique 3, elle même montée sur l'embase 4 ; on a omis volontairement tous les détails concernant cette partie de la grille, son'usinage, sa fixation, comme extérieurs à l'invention.The grid has at its base a sleeve 1.1. fitted onto the metal crown 3, itself mounted on the base 4; we have voluntarily omitted all the details concerning this part of the grid, its machining, its fixing, as external to the invention.

A la partie supérieure de la grille 1 est réalisé un alésage central de précision 1.2.At the upper part of the grid 1 is produced a central bore of precision 1.2.

Sur la partie supérieure du mât central 5 est fixé un disque 5.1. dont le diamètre extérieur est inférieur à celui de l'alésage de la grille. Ce disque comporte une série de trous taraudés 5.1.1. Il est réalisé en métal.On the upper part of the central mast 5 is fixed a disc 5.1. whose outside diameter is less than that of the grid bore. This disc has a series of tapped holes 5.1.1. It is made of metal.

Une cloche 6, à fond plat, représentée à plus grande échelle figure 2, en graphite pyrolytique, est montée sur le plateau 5.1. Le fond de la cloche comporte un alésage circulaire 6.1, par lequel elle s'engage sur le plateau 5.1. ; elle est munie de fentes de dilatation 6.2., quatre sur l'exemple représenté.A bell 6, with a flat bottom, shown on a larger scale in FIG. 2, in pyrolytic graphite, is mounted on the plate 5.1. The bottom of the bell has a circular bore 6.1, by which it engages on the plate 5.1. ; it is provided with expansion slots 6.2., four in the example shown.

La jupe 6.3. de la cloche tronconique, comporte des fentes 6.4. réparties régulièrement sur sa périphérie et définissant un ensemble de lames 6.5. Le diamètre de l'alésage supérieur de la grille est compris entre les diamètres extrêmes de la jupe conique comme le montre le détail de la figure 3 ; la grille est descendue sur la cloche sur laquelle elle vient appuyer élastiquement grâce aux lames 6.5 qu'elle resserre légèrement, sans aucun risque de collage ou de frittage du fait que le contact est réalisé graphite sur graphite.The skirt 6.3. of the frustoconical bell, has slots 6.4. regularly distributed around its periphery and defining a set of blades 6.5. The diameter of the upper grid bore is between the extreme diameters of the skirt conical as shown in detail in Figure 3; the grid is lowered onto the bell on which it comes to press elastically thanks to the blades 6.5 which it tightens slightly, without any risk of sticking or sintering because the contact is made graphite on graphite.

La cloche comporte d'autre part des trous 6.6. de fixation sur le plateau 5.1. On voit en 7 les vis de fixation. Dans l'exemple de la figure, en 8, sont représentés des shunts constitués par des lames de tantale fixées à l'une de leurs extrémités sous les têtes des vis 7 et soudées à l'autre sur le mât.The bell also has holes 6.6. fixing on the plate 5.1. We see in 7 the fixing screws. In the example of the figure, at 8, are represented shunts constituted by tantalum blades fixed at one of their ends under the heads of the screws 7 and welded to the other on the mast.

Le montage peut encoré être complété par des shunts 9 similaires aux shunts 8, soudés d'une part à l'embase 4 et pris d'autre part sous les vis de fixation 1.1.1 de la grille sur la couronne 3, suivant une disposition connue par ailleurs.The mounting can still be completed by shunts 9 similar to shunts 8, welded on the one hand to the base 4 and taken on the other hand under the fixing screws 1.1.1 of the grid on the crown 3, according to an arrangement otherwise known.

Dans la variante de l'invention représentée sur la figure 4, où les mêmes références indiquent les mêmes éléments que sur la figure 1, la partie supérieure de la grille affecte la forme d'une jupe conique 1.4. découpée en lamelles 1.6. par des fentes 1.5. ; dans cette variante le disque 5.1. est de préférence en graphite ; il présente des bords arrondis.In the variant of the invention shown in Figure 4, where the same references indicate the same elements as in Figure 1, the upper part of the grid assumes the shape of a conical skirt 1.4. cut into strips 1.6. by slots 1.5. ; in this variant the 5.1 disc. is preferably graphite; it has rounded edges.

Ce montage qui présente les même avantages que le précédent est plus simple mais il exige que la grille soit usinée spécialement à cet effet, de façon à présenter les lamelles 1.6.5.2. représente une vis de fixation centrale du disque 5.1 f en graphite, sur le mât 5.This assembly, which has the same advantages as the previous one, is simpler but it requires that the grid be machined specially for this purpose, so as to present the strips 1.6.5.2. shows a central fixing screw for the 5.1 f graphite disc on the mast 5.

La figure 5 est une vue d'ensemble en coupe d'une lampe à quatre électrodes ou tétrode , comportant une grille écran 1 montée comme celle de la variante de la figure 1.Figure 5 is an overall sectional view of a lamp with four electrodes or tetrode, comprising a screen grid 1 mounted like that of the variant of FIG. 1.

On retrouve sur cette figure avec les mêmes repères les éléments décrits précédemment et, en outre, la cathode portant le repère 10, une première grille de commande, disposée à l'intérieur de la grille 1 et portant le repère 50, l'anode désignée par le repère 2 et le queusot 20 de l'enceinte à vide. La figure montre également dans sa partie inférieure les coupelles métalliques 41 à 45 de connexion des différentes électrodes aux sources de tension, non représentées, qui les alimentent, coupelles isolées les unes des autres par des cales en matière isolante 46. Les repères 30 et 40 désignent respectivement un radiateur et un capot de protection.We find in this figure with the same references the elements described above and, in addition, the cathode carrying the reference 10, a first control grid, arranged inside the grid 1 and bearing the reference 50, the designated anode by the mark 2 and the queusot 20 of the vacuum enclosure. The figure also shows in its lower part the metal cups 41 to 45 for connection of the different electrodes to the voltage sources, not shown, which supply them, cups isolated from each other by shims of insulating material 46. The references 30 and 40 respectively designate a radiator and a protective cover.

A titre d'exemple non limitatif une grille de 200 mm de hauteur et 90 mm de diamètre dans sa partie centrale a été montée avec une cloche ayant un diamètre de 31 mm à sa base et une pente de 2°30 pour une hauteur totale de 10 mm ; la hauteur des fentes était de 7 mm et l'alésage central de la cloche de 15 mm. L'alésage de la grille était légèrement inférieur au diamètre précédent.By way of nonlimiting example, a grid 200 mm high and 90 mm in diameter in its central part has been mounted with a bell having a diameter of 31 mm at its base and a slope of 2 ° 30 for a total height of 10 mm; the height of the slots was 7 mm and the central bore of the bell 15 mm. The grid bore was slightly less than the previous diameter.

Dans des variantes également comprises dans l'invention, le disque 5.1, au lieu d'être rapporté et fixé sur le conducteur central 5, peut en être une partie intégrante ou soudé sur celui-ci.In variants also included in the invention, the disc 5.1, instead of being attached and fixed to the central conductor 5, can be an integral part of it or welded onto it.

Claims (5)

1. Tube électronique à électrodes cylindriques coaxiales comportant au moins une grille en graphite pyrolytique ouverte à sa partie supérieure et un mât conducteur central coaxial avec ces électrodes passant dans cette ouverture, en conatct électrique l'un avec l'autre à leur partie supérieure, caractérisé en ce que ce contact a lieu par des lames, séparées par des fentes réparties sur un pourtour circulaire.1. Electronic tube with coaxial cylindrical electrodes comprising at least one pyrolytic graphite grid open at its upper part and a central conductive mast coaxial with these electrodes passing through this opening, in electrical contact with each other at their upper part, characterized in that this contact takes place by blades, separated by slots distributed on a circular periphery. 2. Tube électronique suivant la revendication 1, caractérisé en ce que les lames en question s'étendent à partir du bord inférieur de la jupe tronconique d'une cloche en graphite pyrolytique fixée par son fond sur le.mât et sont en contact à une certaine distance de ce bord, par leur face extérieure, avec le bord de l'ouverture de la grille.2. Electronic tube according to claim 1, characterized in that the blades in question extend from the lower edge of the frustoconical skirt of a pyrolytic graphite bell fixed by its bottom on the mast and are in contact with a certain distance from this edge, by their outside face, with the edge of the grid opening. 3. Tube électronique suivant la revendication 1, caractérisé en ce que la grille se termine à sa partie supérieure par une partie rétrécie sur le bord de laquelle sont découpées les lames, lesquelles sont en contact avec le mât.3. Electronic tube according to claim 1, characterized in that the grid ends at its upper part by a narrowed part on the edge of which are cut the blades, which are in contact with the mast. 4. Tube électronique suivant la revendication 2, caractérisé en ce que la fixation de la cloche sur le mât a lieu par le moyen d'un disque intermédiaire en métal fixé sur le mât.4. Electronic tube according to claim 2, characterized in that the fixing of the bell on the mast takes place by means of an intermediate metal disc fixed on the mast. 5. Tube électronique suivant la revendication 3, caractérisé en ce que les lames sont en contact avec le mât par l'intermédiaire d'un disque en graphite pyrolytique fixé sur le mât.5. Electronic tube according to claim 3, characterized in that the blades are in contact with the mast by means of a pyrolytic graphite disc fixed on the mast.
EP79400518A 1978-07-27 1979-07-20 Electron tube with a cylindrical pyrolytic graphite grid Expired EP0007865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7822265A FR2432215A1 (en) 1978-07-27 1978-07-27 ELECTRONIC TUBE WITH CYLINDRICAL GRID IN PYROLYTIC GRAPHITE
FR7822265 1978-07-27

Publications (2)

Publication Number Publication Date
EP0007865A1 true EP0007865A1 (en) 1980-02-06
EP0007865B1 EP0007865B1 (en) 1982-02-03

Family

ID=9211260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400518A Expired EP0007865B1 (en) 1978-07-27 1979-07-20 Electron tube with a cylindrical pyrolytic graphite grid

Country Status (4)

Country Link
US (1) US4387320A (en)
EP (1) EP0007865B1 (en)
DE (1) DE2962047D1 (en)
FR (1) FR2432215A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999041762A1 (en) * 1998-02-13 1999-08-19 Thomson Tubes Electroniques Electronic tube grid with axial beam

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520553A1 (en) * 1982-01-22 1983-07-29 Cameca ELECTRONIC OPTICAL APPARATUS COMPRISING PYROLYTIC GRAPHITE ELEMENTS
FR2661778A1 (en) * 1990-05-04 1991-11-08 Thomson Tubes Electroniques GRID AMPLIFIER TUBE WITH VARIABLE WIDTH BARS.
DE59106482D1 (en) * 1991-01-21 1995-10-19 Thomson Elektronenroehren Ag Controllable high-performance electron tube.
GB9405139D0 (en) * 1994-03-16 1994-05-18 Eev Ltd Electron gun arrangements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528755A (en) *
GB1293596A (en) * 1968-11-21 1972-10-18 Varian Associates Improvements in electron tubes comprising an evacuated envelope enclosing at least three cylindrical electrodes
FR2276681A1 (en) * 1974-06-28 1976-01-23 Thomson Csf GRID FOR ELECTRONIC TUBE AND TUBE WITH SUCH GRID

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164740A (en) * 1960-04-29 1965-01-05 Rca Corp Electron tube grids and method of making the same
FR1344220A (en) * 1962-03-02 1963-11-29 Thomson Houston Comp Francaise Grid for electron tubes
GB1514591A (en) * 1976-01-29 1978-06-14 English Electric Valve Co Ltd Electronic valves
FR2429490A1 (en) * 1978-06-23 1980-01-18 Thomson Csf PYROLYTIC GRAPHITE GRID FOR HIGH POWER ELECTRONIC TUBE, AND MOUNTING METHOD THEREOF
US4302701A (en) * 1978-07-07 1981-11-24 Siemens Aktiengesellschaft Directly heated cathode for an electron tube with coaxial electrode design

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528755A (en) *
GB1293596A (en) * 1968-11-21 1972-10-18 Varian Associates Improvements in electron tubes comprising an evacuated envelope enclosing at least three cylindrical electrodes
FR2276681A1 (en) * 1974-06-28 1976-01-23 Thomson Csf GRID FOR ELECTRONIC TUBE AND TUBE WITH SUCH GRID

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999041762A1 (en) * 1998-02-13 1999-08-19 Thomson Tubes Electroniques Electronic tube grid with axial beam
FR2775118A1 (en) * 1998-02-13 1999-08-20 Thomson Tubes Electroniques GRID FOR ELECTRONIC TUBE WITH AXIAL BEAM WITH IMPROVED PERFORMANCE

Also Published As

Publication number Publication date
FR2432215B1 (en) 1980-12-12
EP0007865B1 (en) 1982-02-03
US4387320A (en) 1983-06-07
FR2432215A1 (en) 1980-02-22
DE2962047D1 (en) 1982-03-11

Similar Documents

Publication Publication Date Title
EP1139358A1 (en) Electrical switching device having a vacuum bottle and a flexible electrical connection
EP0007865B1 (en) Electron tube with a cylindrical pyrolytic graphite grid
FR2772983A1 (en) ELECTRIC DISCHARGE BULB DEVICE
EP1170794A1 (en) Method of fabricating a power electronic component and power electronic component obtained thereby
FR2903221A1 (en) METHOD FOR FASTENING AN ELEMENT IN AN ELECTRICAL APPARATUS AND ELECTRIC APPARATUS SUCH AS A VACUUM BULB HAVING AT LEAST TWO FIXED PARTS ACCORDING TO SUCH A METHOD
EP0512906B1 (en) Battery of nickel-hydrogen accumulators
EP0160594B1 (en) Piezoelectric resonator
EP0290341B1 (en) Commutator for an electrical rotating machine, and production process of this commutator
FR2479579A1 (en) DEVICE FOR FIXING AND TAKING ELECTRIC CONTACT OF A BATTERY IN A WATCH
FR2549953A1 (en) CATHODE MOUNTING IN A RING LASER GYROSCOPE
FR2754393A1 (en) DEVICE FOR INTRODUCING AND HOLDING AN ELECTRODES BEAM IN AN ELECTROCHEMICAL GENERATOR CONTAINER
EP0349379B1 (en) Control spider with removable rods for a nuclear fuel assembly
EP2485260B1 (en) Method for assembly and airtight sealing of an encapsulation box
EP0391798B1 (en) Temperature sensor with thermistor and method of making it
EP1056633B1 (en) Servomotor using a controlled density filter
EP0003937B1 (en) Cathode for an electron gun
EP0004220A1 (en) Solar energy collector
FR2580696A1 (en) Pillar support and jack interacting with such a support and with a technical floor
FR2626158A1 (en) Flower holder
EP1055246B1 (en) Electronic tube grid with axial beam
EP1056109B1 (en) Medium voltage vacuum circuit breaker with a protection housing per pole
FR2620581A1 (en) Improved lightning-conductor installation
EP0385888A1 (en) Piezoelectric unit with conductive elastic holding elements
FR2487624A1 (en) ELECTRODE HOLDER DEVICE
AU595210B2 (en) Method and apparatus for measuring temperature of substrate

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB NL

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE GB NL

REF Corresponds to:

Ref document number: 2962047

Country of ref document: DE

Date of ref document: 19820311

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19890731

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19910201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910617

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910624

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910625

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920720

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19920731

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920720

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930401

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT