EP0077240B1 - Printed tape inductance and transmitter using such an inductance - Google Patents

Printed tape inductance and transmitter using such an inductance Download PDF

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Publication number
EP0077240B1
EP0077240B1 EP19820401758 EP82401758A EP0077240B1 EP 0077240 B1 EP0077240 B1 EP 0077240B1 EP 19820401758 EP19820401758 EP 19820401758 EP 82401758 A EP82401758 A EP 82401758A EP 0077240 B1 EP0077240 B1 EP 0077240B1
Authority
EP
European Patent Office
Prior art keywords
inductance
cylinder
ring
cursor
axis
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
EP19820401758
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German (de)
French (fr)
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EP0077240A1 (en
Inventor
Albert Boubouleix
Jacques Hermann
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Thales SA
Original Assignee
Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0077240A1 publication Critical patent/EP0077240A1/en
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Publication of EP0077240B1 publication Critical patent/EP0077240B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/004—Printed inductances with the coil helically wound around an axis without a core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/006—Printed inductances flexible printed inductors

Definitions

  • the invention relates to an inductor mainly used in circuits tuned on medium power transmitters.
  • Such inductances are usually produced by winding a conductor according to a helix defined by its pitch and its number of turns drawn on a generator cylinder.
  • this variation can be ensured by leaps, by switching taps arranged along the propeller, which makes it possible to change the number of turns contributing to the value of the inductor.
  • the transmitter has a remote control or an automatic tuning system
  • a continuous variation of the inductance value is necessary.
  • this variation is obtained by the displacement of the fulcrum of a cursor on the conductor by a screwing movement around the axis of the propeller.
  • the cursor is usually placed inside the propeller. It is in mechanical and electrical connection with a rotary conductor arranged along the axis of the propeller, on which it can move longitudinally.
  • a motor rotates the axial conductor, which causes the desired variation in the inductance.
  • Such devices have electrical drawbacks such as the presence in series of three friction contacts, one on the cursor in contact with the helical conductor, a second allowing sliding on the rotating axial conductor, a third to ensure the connection of this axial conductor with the fixed elements of the circuits associated with the device.
  • the unused turns of the propeller have a "dead end" effect capable of creating parasitic resonances.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is an inductor comprising a conductor forming a cylindrical helix, the conductor being constituted by a ribbon printed on the surface of an insulating cylinder, characterized in that it is made variable by sliding along the axis of the insulating cylinder of a slider comprising at least one ring of contacts mounted on a conductive ring of diameter slightly greater than that of the cylinder.
  • Fig. 1 represents a flexible support surface 1 printed on which inclined copper strips 2 are obtained by implementing a known technique for manufacturing printed circuits consisting, for example, of attacking by chemical means the surface parts left free between the copper bands, after screen printing of the drawing representing the bands, using a protective ink.
  • the winding of the support 1 on an insulating cylinder 3, shown in FIG. 2, superimpose lines A and B in fig. 1, which restores the continuity of the helical conductor.
  • This continuity is materially produced along a strip C which extends the width of the support beyond the line A and which constitutes an overlap zone after winding of the support on the insulating cylinder 3.
  • Fig. 3 shows in section the elements which ensure, in this overlap zone, the electrical continuity at a copper strip 2 of the printed support and the mechanical fixing of this flexible support on the insulating cylinder 3.
  • the flexible support 1 used is a double-sided circuit.
  • the copper-colored parts of the first face form the turns 2 of the inductance.
  • the copper-colored part of the second face is limited to the facing surfaces with the copper-colored parts of the first face at the level of the covering strip C, in order to constitute fixing zones by welding with the corresponding copper-colored parts of the first face, in order to '' ensure the mechanical strength and facilitate the wetting, by welding, of rivets 4 ensuring electrical continuity.
  • This process results in the construction of an inductor of fixed value and usable as it is.
  • This inductance is made adjustable by the installation of a slider according to FIG. 4.
  • This cursor consists of a copper ring 5 with a diameter slightly greater than that of the printed cylinder.
  • a crown, 6 and 7 composed of about fifty elastic contacts pressing on the cylinder along a circumference located in a plane perpendicular to the axis of the cylinder.
  • These crowns are made of beryllium bronze from a band 8 in FIG. 5 cut into the shape of a comb with wide teeth 9.
  • each teeth are then preformed so that each forms one of the contacts of a crown, the latter being made up of a length of strip, fixed, using rivets, by its unformed part, at one end of the slider ring, over the entire length of its internal circumference.
  • a crown being made up of a length of strip, fixed, using rivets, by its unformed part, at one end of the slider ring, over the entire length of its internal circumference.
  • One of these crowns 6 ensures the connection between the cursor ring and the printed turns, by a number of contacts in parallel which is all the higher the larger the width of the printed part and the narrower the space between turns.
  • the ring is dimensioned in length so that short-circuit, via the two crowns mounted at its ends, the unused turns, whatever its position between those giving the maximum and minimum values of the inductance.
  • the width and the pitch of the helical conductor can vary the along the cylinder.
  • the conductive strips 2 of FIG. 1 represent an example of this improvement.
  • the increase in the width of the conductive strip in the region which remains alone used at low inductance values allows the improvement of the inductance overvoltage for these low values.
  • the increased surface of the copper in this region allows an improved evacuation of the calories due to the high frequency losses of the device, these losses being concentrated on the only turns remaining used for the low inductance values.
  • the variation in the pitch of the helix formed by the conductive strip also makes it possible to improve the device by choosing an optimized law of variation of the inductance as a function of the movement of the ring along the printed cylinder.
  • the electrical connection, between the cursor ring and the fixed elements of the circuits associated with the inductance, is provided by a wiper 10 in FIG. 4, integral with the ring, which establishes permanent contact with a silver brass rail 11 disposed parallel to the axis of the insulating cylinder.
  • Fig. 6 shows the inductance terminated with the drive means of the slider ring.
  • the printed support 1 the helical drawing 2
  • the cursor ring 5 the contact rings 6 and 7.
  • the positions of the cursor 10 and of the rail 11 are recalled in the middle of the ring.
  • the sliding of the slider ring along the cylinder carrying the printed inductance is ensured by two threaded rods 12, 13 arranged parallel and symmetrically with respect to the axis of the printed cylinder.
  • These rods have a thread consisting of a square section groove whose pitch is determined according to the friction and the desired speed of movement of the ring.
  • These rods act by screwing in a balanced manner on two nuts 14, 15 made integral with the ring using insulating spacers 16,17.
  • the rotation of the rods is ensured by gears 18, 19 integral with these rods and placed in a plane perpendicular to the axis of the cylinder printed at the end thereof.
  • These gears are themselves driven synchronously by an intermediate gear 20, itself driven by a servo motor not shown in the figure.
  • the symmetrical action of the ring drive system allows precise positioning of the ring during changes in inductance value while maintaining the coincidence of its axis and that of the printed cylinder. This avoids any jamming effect and excessive crushing of the crown contacts, which could result from an asymmetrical drive of the ring.
  • variable inductance which has just been described is particularly applicable to the tuning circuits of the transmitters.
  • a maximum value of 111 lH is obtained with 22 turns printed on a cylinder with a diameter of 70 mm and a length of 280 mm.
  • the admissible current is 10 A with an overvoltage coefficient greater than 200.
  • the resulting dissipated power is approximately 15 W.
  • the printed circuit used to obtain these performances has a copper thickness greater than 1 00 Il.
  • the mechanical drive described allows a positioning time of less than 1.5 s.
  • the invention is not limited to the embodiment precisely described and produced.
  • various techniques of printed circuits can provide alternative embodiments.
  • the use, for example, of metallized holes can eliminate the use of rivets on the overlap zone C of FIG. 3.
  • the support cylinder may in another variant be made of insulating material treated to receive, directly by copper metallization, the design of the inductor according to the known screen printing process, this avoiding the winding operation described above.
  • the electrical connection of the slider ring to the fixed elements of the associated circuits by means of the wiper 10 and the rail 11 can be replaced in another variant embodiment by a semi-rigid connection such as a copper strip, which eliminates a friction contact if the mechanical and electrical stabilities are deemed sufficient.
  • the embodiment then presents only one contact by friction in series with the inductor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Description

L'invention concerne une inductance principalement utilisée dans des circuits accordés sur des émetteurs de moyenne puissance.The invention relates to an inductor mainly used in circuits tuned on medium power transmitters.

De telles inductances sont habituellement réalisées en bobinant un conducteur selon une hélice définie par son pas et son nombre de spires tracées sur un cylindre générateur. Dans le cas d'une inductance variable, cette variation peut être assurée par bonds, en commutant des prises disposées le long de l'hélice, ce qui permet de changer le nombre des spires contribuant à la valeur de l'inductance. Lorsque l'émetteur possède une télécommande ou un système d'accord automatique, une variation continue de la valeur de l'inductance est nécessaire. Dans ce cas, cette variation est obtenue par le déplacement du point d'appui d'un curseur sur le conducteur par un mouvement de vissage autour de l'axe de l'hélice. Le curseur est habituellement placé à l'intérieur de l'hélice. Il est en liaison mécanique et électrique avec un conducteur rotatif disposé selon l'axe de l'hélice, sur lequel il peut se déplacer longitudinalement. Un moteur assure la rotation du conducteur axial, ce qui entraîne la variation souhaitée de l'inductance.Such inductances are usually produced by winding a conductor according to a helix defined by its pitch and its number of turns drawn on a generator cylinder. In the case of a variable inductor, this variation can be ensured by leaps, by switching taps arranged along the propeller, which makes it possible to change the number of turns contributing to the value of the inductor. When the transmitter has a remote control or an automatic tuning system, a continuous variation of the inductance value is necessary. In this case, this variation is obtained by the displacement of the fulcrum of a cursor on the conductor by a screwing movement around the axis of the propeller. The cursor is usually placed inside the propeller. It is in mechanical and electrical connection with a rotary conductor arranged along the axis of the propeller, on which it can move longitudinally. A motor rotates the axial conductor, which causes the desired variation in the inductance.

De tels dispositifs présentent des inconvénients électriques tels que la présence en série de trois contacts par frottement, un sur le curseur en contact avec le conducteur en hélice, un deuxième permettant le glissement sur le conducteur axial tournant, un troisième pour assurer la liaison de ce conducteur axial avec les éléments fixes des circuits associés au dispositif. D'autre part, les spires inutilisées de l'hélice présentent un effet de «bout mort» susceptible de créer des résonances parasites.Such devices have electrical drawbacks such as the presence in series of three friction contacts, one on the cursor in contact with the helical conductor, a second allowing sliding on the rotating axial conductor, a third to ensure the connection of this axial conductor with the fixed elements of the circuits associated with the device. On the other hand, the unused turns of the propeller have a "dead end" effect capable of creating parasitic resonances.

Sur le plan mécanique, une variation entre les valeurs extrêmes de l'inductance impose au curseur le parcours de la longueur développée du conducteur en hélice. La rapidité du positionnement du curseur sur ce parcours est limitée par des considérations telles que l'inertie des masses tournantes mises en mouvement et l'usure due à la grande vitesse de glissement du curseur sur le conducteur et la pression exigée pour obtenir une résistance de contact minimale entre le curseur et le conducteur. Ces contraintes imposent la mise en ceuvre de dispositifs d'asservissement puissants, dissipant beaucoup d'énergie, associés à des réalisations mécaniques coûteuses.On the mechanical level, a variation between the extreme values of the inductance forces the cursor to travel the developed length of the helical conductor. The speed of positioning the cursor on this path is limited by considerations such as the inertia of the rotating masses set in motion and wear due to the high speed of sliding of the cursor on the conductor and the pressure required to obtain a resistance of minimum contact between the cursor and the conductor. These constraints require the implementation of powerful servo devices, dissipating a lot of energy, associated with expensive mechanical achievements.

Le but de l'invention est de pallier les inconvénients précités.The object of the invention is to overcome the aforementioned drawbacks.

A cet effet l'invention a pour objet une inductance comportant un conducteur formant une hélice cylindrique, le conducteur étant constitué par un ruban imprimé sur la surface d'un cylindre isolant, caractérisée en ce qu'elle est rendue variable par glissement le long de l'axe du cylindre isolant d'un curseur comportant au moins une couronne de contacts montée sur une bague conductrice de diamètre légèrement supérieur à celui du cylindre.To this end, the subject of the invention is an inductor comprising a conductor forming a cylindrical helix, the conductor being constituted by a ribbon printed on the surface of an insulating cylinder, characterized in that it is made variable by sliding along the axis of the insulating cylinder of a slider comprising at least one ring of contacts mounted on a conductive ring of diameter slightly greater than that of the cylinder.

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description ci-après d'un mode de réalisation de l'invention et des figures s'y rapportant.

  • Les fig. 1, 2, 3, 4, 5 illustrent les étapes de fabrication de l'inductance selon l'invention.
  • La fig. 6 représente les éléments essentiels de l'inductance terminée.
The invention will be better understood and other characteristics will appear with the aid of the description below of an embodiment of the invention and of the figures relating thereto.
  • Figs. 1, 2, 3, 4, 5 illustrate the steps for manufacturing the inductor according to the invention.
  • Fig. 6 shows the essential elements of the completed inductance.

La fig. 1 représente une surface de support souple 1 imprimé sur lequel des bandes de cuivre 2 inclinées sont obtenues par mise en oeuvre d'une technique connue de fabrication de circuits imprimés consistant, par exemple, à attaquer par voie chimique les parties de surface laissées libres entre les bandes de cuivre, après impression par sérigraphie du dessin représentant les bandes, à l'aide d'une encre protectrice. L'enroulement du support 1 sur un cylindre isolant 3, représenté sur la fig. 2, superpose les lignes A et B de la fig. 1, ce qui reconstitue la continuité du conducteur en hélice. Cette continuité est matériellement réalisée suivant une bande C qui prolonge la largeur du support au-delà de la ligne A et qui constitue une zone de recouvrement après enroulement du support sur le cylindre isolant 3.Fig. 1 represents a flexible support surface 1 printed on which inclined copper strips 2 are obtained by implementing a known technique for manufacturing printed circuits consisting, for example, of attacking by chemical means the surface parts left free between the copper bands, after screen printing of the drawing representing the bands, using a protective ink. The winding of the support 1 on an insulating cylinder 3, shown in FIG. 2, superimpose lines A and B in fig. 1, which restores the continuity of the helical conductor. This continuity is materially produced along a strip C which extends the width of the support beyond the line A and which constitutes an overlap zone after winding of the support on the insulating cylinder 3.

La fig. 3 représente en coupe les éléments qui assurent, dans cette zone de recouvrement, la continuité électrique au niveau d'une bande de cuivre 2 du support imprimé et la fixation mécanique de ce support souple sur le cylindre isolant 3. Le support souple 1 utilisé est un circuit double face. Les parties cuivrées de la première face forment les spires 2 de l'inductance. La partie cuivrée de la deuxième face est limitée aux surfaces en regard avec les parties cuivrées de la première face au niveau de la bande de recouvrement C, pour constituer des zones de fixation par soudure avec les parties cuivrées correspondantes de la première face, afin d'assurer la tenue mécanique et de faciliter le mouillage, par la soudure, de rivets 4 assurant la continuité électrique.Fig. 3 shows in section the elements which ensure, in this overlap zone, the electrical continuity at a copper strip 2 of the printed support and the mechanical fixing of this flexible support on the insulating cylinder 3. The flexible support 1 used is a double-sided circuit. The copper-colored parts of the first face form the turns 2 of the inductance. The copper-colored part of the second face is limited to the facing surfaces with the copper-colored parts of the first face at the level of the covering strip C, in order to constitute fixing zones by welding with the corresponding copper-colored parts of the first face, in order to '' ensure the mechanical strength and facilitate the wetting, by welding, of rivets 4 ensuring electrical continuity.

Ce procédé aboutit à la construction d'une inductance de valeur fixe et utilisable telle quelle. Cette inductance, selon une des caractéristiques de l'invention, est rendue ajustable par la mise en place d'un curseur selon la fig. 4. Ce curseur est constitué par une bague en cuivre 5 de diamètre légèrement supérieur à celui du cylindre imprimé. A chaque extrémité de cette bague est fixée une couronne, 6 et 7, composée d'environ cinquante contacts élastiques faisant pression sur le cylindre le long d'une circonférence située dans un plan perpendiculaire à l'axe du cylindre. Ces couronnes sont réalisées en bronze béryllium à partir d'une bande 8 sur la fig. 5 découpée en forme de peigne à larges dents 9. Ces dents sont ensuite préformées de façon que chacune forme l'un des contacts d'une couronne, celle-ci étant constituée d'une longueur de bande, fixée, à l'aide de rivets, par sa partie non formée, à une extrémité de la bague curseur, sur toute la longueur de sa circonférence interne. L'une de ces couronnes 6 assure la liaison entre la bague curseur et les spires imprimées, par un nombre de contacts en parallèle d'autant plus élevé que la largeur de la partie imprimée est grande et que l'espace entre spires est étroit. La bague est dimensionnée en longueur de façon à court-circuiter, par l'intermédiaire des deux couronnes montées à ses extrémités, les spires non utilisées, quelle que soit sa position entre celles donnant les valeurs maximale et minimale de l'inductance.This process results in the construction of an inductor of fixed value and usable as it is. This inductance, according to one of the characteristics of the invention, is made adjustable by the installation of a slider according to FIG. 4. This cursor consists of a copper ring 5 with a diameter slightly greater than that of the printed cylinder. At each end of this ring is fixed a crown, 6 and 7, composed of about fifty elastic contacts pressing on the cylinder along a circumference located in a plane perpendicular to the axis of the cylinder. These crowns are made of beryllium bronze from a band 8 in FIG. 5 cut into the shape of a comb with wide teeth 9. These teeth are then preformed so that each forms one of the contacts of a crown, the latter being made up of a length of strip, fixed, using rivets, by its unformed part, at one end of the slider ring, over the entire length of its internal circumference. One of these crowns 6 ensures the connection between the cursor ring and the printed turns, by a number of contacts in parallel which is all the higher the larger the width of the printed part and the narrower the space between turns. The ring is dimensioned in length so that short-circuit, via the two crowns mounted at its ends, the unused turns, whatever its position between those giving the maximum and minimum values of the inductance.

Une autre caractéristique de la construction de l'inductance à partir de circuits imprimés selon l'invention autorise la mise en oeuvre d'un perfectionnement supplémentaire dans le cas d'une inductance variable: la largeur et le pas du conducteur en hélice peuvent varier le long du cylindre. Les bandes conductrices 2 de la fig. 1 représentent un exemple de ce perfectionnement.Another characteristic of the construction of the inductor from printed circuits according to the invention allows the implementation of an additional improvement in the case of a variable inductor: the width and the pitch of the helical conductor can vary the along the cylinder. The conductive strips 2 of FIG. 1 represent an example of this improvement.

L'augmentation de la largeur de la bande conductrice dans la région qui reste seule utilisée aux faibles valeurs d'inductance permet l'amélioration de la surtension de l'inductance pour ces faibles valeurs. D'autre part la surface augmentée du cuivre en cette région permet une évacuation améliorée des calories dues aux pertes hautes fréquences du dispositif, ces pertes se trouvant concentrées sur les seules spires restant utilisées pour les faibles valeurs d'inductance.The increase in the width of the conductive strip in the region which remains alone used at low inductance values allows the improvement of the inductance overvoltage for these low values. On the other hand the increased surface of the copper in this region allows an improved evacuation of the calories due to the high frequency losses of the device, these losses being concentrated on the only turns remaining used for the low inductance values.

La variation du pas de l'hélice formée par le ruban conducteur permet par ailleurs de perfectionner le dispositif en choisissant une loi de variation optimisée de l'inductance en fonction du déplacement de la bague sur le long du cylindre imprimé.The variation in the pitch of the helix formed by the conductive strip also makes it possible to improve the device by choosing an optimized law of variation of the inductance as a function of the movement of the ring along the printed cylinder.

La liaison électrique, entre la bague curseur et les éléments fixes des circuits associés à l'inductance, est assurée par un frotteur 10 sur la fig. 4, solidaire de la bague, qui établit un contact permanent avec un rail en laiton argenté 11 disposé parallèlement à l'axe du cylindre isolant.The electrical connection, between the cursor ring and the fixed elements of the circuits associated with the inductance, is provided by a wiper 10 in FIG. 4, integral with the ring, which establishes permanent contact with a silver brass rail 11 disposed parallel to the axis of the insulating cylinder.

La fig. 6 représente l'inductance terminée avec les moyens d'entraînement de la bague curseur. Pour les commodités de lecture du dessin, sont seuls représentés les éléments nécessaires à la compréhension de l'invention. Sont reportés: le support imprimé 1, le dessin en hélice 2, la bague curseur 5 et ses couronnes de contacts 6 et 7. Les positions du curseur 10 et du rail 11 sont rappelées au milieu de la bague.Fig. 6 shows the inductance terminated with the drive means of the slider ring. For the convenience of reading the drawing, only the elements necessary for understanding the invention are shown. The following are reported: the printed support 1, the helical drawing 2, the cursor ring 5 and its contact rings 6 and 7. The positions of the cursor 10 and of the rail 11 are recalled in the middle of the ring.

Le glissement de la bague curseur le long du cylindre portant l'inductance imprimée est assuré par deux tiges filetées 12, 13 disposées parallèlement et symétriquement par rapport à l'axe du cylindre imprimé. Ces tiges ont un filetage constitué par une rainure de section carrée dont le pas est déterminé en fonction des frottements et de la vitesse souhaitée du déplacement de la bague. Ces tiges agissent par vissage d'une manière équilibrée sur deux écrous 14, 15 rendus solidaires de la bague à l'aide d'entretoises isolantes 16,17. La rotation des tiges est assurée par des engrenages 18, 19 solidaires de ces tiges et placés dans un plan perpendiculaire à l'axe du cylindre imprimé à l'extrémité de celui-ci. Ces engrenages sont eux- mêmes entraînés d'une manière synchrone par un engrenage intermédiaire 20, lui-même entraîné par un moteur d'asservissement non représenté sur la figure. L'action symétrique du système d'entraînement de la bague permet un positionnement précis de celle-ci pendant les changements de valeur d'inductance en maintenant la coïncidence de son axe et de celui du cylindre imprimé. Cela évite tout effet de coincement et un écrasement excessif des contacts des couronnes, qui pourraient résulter d'un entraînement dissymétrique de la bague.The sliding of the slider ring along the cylinder carrying the printed inductance is ensured by two threaded rods 12, 13 arranged parallel and symmetrically with respect to the axis of the printed cylinder. These rods have a thread consisting of a square section groove whose pitch is determined according to the friction and the desired speed of movement of the ring. These rods act by screwing in a balanced manner on two nuts 14, 15 made integral with the ring using insulating spacers 16,17. The rotation of the rods is ensured by gears 18, 19 integral with these rods and placed in a plane perpendicular to the axis of the cylinder printed at the end thereof. These gears are themselves driven synchronously by an intermediate gear 20, itself driven by a servo motor not shown in the figure. The symmetrical action of the ring drive system allows precise positioning of the ring during changes in inductance value while maintaining the coincidence of its axis and that of the printed cylinder. This avoids any jamming effect and excessive crushing of the crown contacts, which could result from an asymmetrical drive of the ring.

L'inductance variable qui vient d'être décrite est particulièrement applicable aux circuits d'accord des émetteurs. Dans un mode de réalisation pour la gamme de 1,5 à 30 MHz, une valeur maximale de 111lH est obtenue avec 22 spires imprimées sur un cylindre de diamètre de 70 mm et de longueur de 280 mm. Le courant admissible est de 10 A avec un coefficient de surtension supérieur à 200. La puissance dissipée résultante est d'environ 15 W. Le circuit imprimé utilisé pour obtenir ces performances présente une épaisseur de cuivre supérieure à 1 00 Il.The variable inductance which has just been described is particularly applicable to the tuning circuits of the transmitters. In an embodiment for the range from 1.5 to 30 MHz, a maximum value of 111 lH is obtained with 22 turns printed on a cylinder with a diameter of 70 mm and a length of 280 mm. The admissible current is 10 A with an overvoltage coefficient greater than 200. The resulting dissipated power is approximately 15 W. The printed circuit used to obtain these performances has a copper thickness greater than 1 00 Il.

L'entraînement mécanique décrit permet un temps de positionnement inférieur à 1,5 s.The mechanical drive described allows a positioning time of less than 1.5 s.

L'invention n'est pas limitée au mode de réalisation précisément décrit et réalisé. En particulier les techniques diverses de circuits imprimés peuvent fournir des variantes de réalisation. L'usage, par exemple, des trous métallisés peut supprimer l'emploi de rivets sur la zone de recouvrement C de la fig. 3. Le cylindre-support peut dans une autre variante être réalisé en matière isolante traitée pour recevoir, directement par métallisation de cuivre, le dessin de l'inductance selon le procédé connu de sérigraphie, cela évitant l'opération d'enroulement précédemment décrite.The invention is not limited to the embodiment precisely described and produced. In particular the various techniques of printed circuits can provide alternative embodiments. The use, for example, of metallized holes can eliminate the use of rivets on the overlap zone C of FIG. 3. The support cylinder may in another variant be made of insulating material treated to receive, directly by copper metallization, the design of the inductor according to the known screen printing process, this avoiding the winding operation described above.

La connexion électrique de la bague curseur aux éléments fixes des circuits associés par l'intermédiaire du frotteur 10 et du rail 11 peut être remplacée dans une autre variante de réalisation par une connexion semi-rigide telle qu'un feuillard de cuivre, ce qui supprime un contact par frottement si les stabilités mécanique et électrique sont jugées suffisantes. La réalisation ne présente alors, qu'un seul contact par frottement en série avec l'inductance.The electrical connection of the slider ring to the fixed elements of the associated circuits by means of the wiper 10 and the rail 11 can be replaced in another variant embodiment by a semi-rigid connection such as a copper strip, which eliminates a friction contact if the mechanical and electrical stabilities are deemed sufficient. The embodiment then presents only one contact by friction in series with the inductor.

Claims (6)

1. An inductance comprising a conductorform- ing a cylindrical spiral, the conductor being constituted by a tape (1) printed on the cylindrical surface of an insultating cylinder (3), characterized in that the inductance is rendered variable by a cursor (5) which glides along the axis of the insulating cylinder and comprises at least one crown of contacts (6) mounted on a conductive ring (5) of a diameter which is slightly larger than that of the cylinder.
2. An inductance according to claim 1, characterized in that the ring is equipped with crowns (6, 7) at both of its ends and is of a length such that its crowns constitute a short-circuit for the unused windings of the spiral band, regardless of the position of the ring.
3. An inductance according to claim 2, characterized in that the spiral band is of a width which varies along the cylinder, the windings constituting the inductance set near its minimal value being those of the greater width.
4. An inductance according to one of claims 2 or 3, characterized in that the spiral band presents a variable lead along the cylinder.
5. An inductance according to claim 4, characterized in that it comprises means for regular driving of the cursor ring, these means comprising two threaded rods (12, 13) positioned parallely and symmetrically with respect to the axis of the cylinder, on which rods are engaged two screws (14, 15) integral with the cursor ring (5), these two rods being free in rotation and being integral with two gear wheels (18,19) mounted in a plane perpendicular to the axis of the cylinder at the end of the latter, these gear wheels being mutually coupled by a third intermediate gear wheel which is itself coupled to a control motor.
6. An emitter, characterized in that it comprises at least one inductance according to one of the preceding claims.
EP19820401758 1981-10-06 1982-09-28 Printed tape inductance and transmitter using such an inductance Expired EP0077240B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118786 1981-10-06
FR8118786A FR2514190B1 (en) 1981-10-06 1981-10-06 PRINTED TAPE INDUCTOR AND TRANSMITTER COMPRISING SUCH AN INDUCTANCE

Publications (2)

Publication Number Publication Date
EP0077240A1 EP0077240A1 (en) 1983-04-20
EP0077240B1 true EP0077240B1 (en) 1985-08-14

Family

ID=9262787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820401758 Expired EP0077240B1 (en) 1981-10-06 1982-09-28 Printed tape inductance and transmitter using such an inductance

Country Status (3)

Country Link
EP (1) EP0077240B1 (en)
DE (1) DE3265438D1 (en)
FR (1) FR2514190B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618122A1 (en) * 1986-05-30 1987-12-03 Johann Leonhard Huettlinger Tunable filter coil
FR2659484A1 (en) * 1990-03-12 1991-09-13 Alcatel Cable Variable inductor
WO2009111165A1 (en) * 2008-02-18 2009-09-11 Advanced Magnet Lab, Inc. Helical coil design and process for direct fabrication from a conductive layer
CN101425358B (en) * 2008-08-08 2011-01-05 西安交通大学 Lightning current waveform forming inductor
EP2419910B1 (en) * 2009-04-16 2014-04-16 Siemens Aktiengesellschaft Winding and method for producing a winding

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
GB674108A (en) * 1900-01-01
ES138162A1 (en) * 1934-07-24 1935-08-16 R S N V Machinerieen En App N REGULATOR TRANSFORMER
NL237742A (en) * 1958-04-03
DE1111682B (en) * 1959-11-11 1961-07-27 Philips Patentverwaltung Tuning arrangement with an approximately circular line
FR1349306A (en) * 1962-11-30 1964-01-17 Device for mobile connections between two fixed electrical windings
CH447377A (en) * 1964-12-16 1967-11-30 Frako Kondensator Apparate Winding for coils in electrical machines and devices
GB1336592A (en) * 1971-07-12 1973-11-07 Denton J Ltd Electrical coils and methods of making same
DE2205045A1 (en) * 1972-02-03 1973-08-09 Wilhelm Dr Ing Lepper COILS FOR DC OR AC
US4045786A (en) * 1974-09-03 1977-08-30 Honeywell Information Systems Inc. Magnetic domain memory device having an improved drive coil arrangement
JPS5545987B2 (en) * 1974-10-02 1980-11-20
DE2520934C3 (en) * 1975-05-10 1982-07-08 Blaupunkt-Werke Gmbh, 3200 Hildesheim Printed coil
DE2643657C3 (en) * 1976-09-28 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electric high frequency coil with continuously variable inductance
FR2379891A1 (en) * 1977-02-03 1978-09-01 Videon Sa General purpose transformer used in TV receivers - has printed circuit windings formed on flexible plastics substrate

Also Published As

Publication number Publication date
DE3265438D1 (en) 1985-09-19
FR2514190B1 (en) 1988-06-17
FR2514190A1 (en) 1983-04-08
EP0077240A1 (en) 1983-04-20

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