EP0270417B1 - Inductor - Google Patents

Inductor Download PDF

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Publication number
EP0270417B1
EP0270417B1 EP19870402512 EP87402512A EP0270417B1 EP 0270417 B1 EP0270417 B1 EP 0270417B1 EP 19870402512 EP19870402512 EP 19870402512 EP 87402512 A EP87402512 A EP 87402512A EP 0270417 B1 EP0270417 B1 EP 0270417B1
Authority
EP
European Patent Office
Prior art keywords
component
lug
tab
edge
component according
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 - Lifetime
Application number
EP19870402512
Other languages
German (de)
French (fr)
Other versions
EP0270417A1 (en
Inventor
René Croue
Jean-Pierre Gros
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
Original Assignee
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 SA filed Critical Thomson CSF SA
Publication of EP0270417A1 publication Critical patent/EP0270417A1/en
Application granted granted Critical
Publication of EP0270417B1 publication Critical patent/EP0270417B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices

Definitions

  • the invention relates to a circuit component, in particular a micro-inductor, having, embedded in a body, at least one end conductor soldered to a flat tab inside the body and which is part of a terminal. outlet, welding being carried out on a flat face of the tab.
  • a circuit component in particular a micro-inductor
  • Such a component is for example known from document US-A-4,064,472.
  • the circuit components have, for their electrical connection, either wire ends or lugs or lugs, which are generally flat. In the latter case, the terminals protrude from the body of the component or along an external face of this body.
  • the invention preferably relates (but not exclusively) to the latter kind of component which does not have a projecting terminal.
  • the size of such a component is reduced, without compromising the ease of connection to a substrate, for example a printed circuit; indeed for the welding of the component, which in general has two connection terminals on the same face, it suffices to place it on the corresponding conductive parts of the substrate and then to perform wave welding.
  • a micro-inductor in which each end of the wound wire is soldered, in the body of the component, to a lug connected to the corresponding external terminal.
  • the invention results from the observation that the thermal stresses imposed on the component when welding the external connection terminals, risk altering the soldering, inside this component, of the conductive wires with the corresponding tabs inside this component.
  • the welding of the end of the conductive wire is combined with an attachment of this end to the tab, this attachment being effected at a location separate from the one where the welding is carried out and being such that the end of the conductive wire passes from one face to the other of the tab.
  • the conductive wire crosses the tab internal thanks to a hole or a slot that this tab has. Provision may also be made, also for good attachment, at the ends of the internal tab of the projections or spoilers retaining the conductive wire.
  • connection terminals each of which has a face substantially in the same plane as an outer wall 20 of the body 13 of the component ( Figure 2).
  • the component appears, when finished, as a parallelepipedic block of resin with, along two edges 14 and 15, sections 16 and 17 respectively with two branches 18 and 19 (FIG. 1) perpendicular.
  • the face 20 having the branches 19 and 19 ′ is deposited on a printed circuit board.
  • the branches 19 and 19 ′ then rest on conductors of the wafer and the fixing is carried out by the technique known as wave welding.
  • the invention relates to the connection of each conductive wire 12 to the corresponding profile 16.
  • profile 16 In FIG. 1, only the profile 16 has been shown in detail, the profile 17 being symmetrical with the profile 16 with respect to a median plane. longitudinal of the component.
  • the latter has a tab 25 projecting from the free edge 24 of the branch 18; this tab 25 extends only over a part of the length of the branch 18. It is closer to one end 181 of this branch 18 than to the other end 182.
  • the tab 25 is inclined obliquely towards the interior of the component while the branch 18 is in the same plane as an external face 23 of the body of the component.
  • This tab 25 has two notches 26 and 27, one of which opens onto a edge 28 perpendicular to the edge 14 while the second notch opens into the opposite edge 29.
  • the free edge 30 of the tab 25 is parallel to the edge 14.
  • the end 12 of the wire 10 leaves from the side of the internal face of the tab 25 to go to the external side of this tab, this first passage taking place in the notch 27. Then this end has a strand 33 welded against the face external part 34 of the tab 25 which is located between the notches 26 and 27. This strand 33 continues with an end which is applied against the internal face of the tab 25 while pressing against the bottom of the notch 26.
  • the upper edge of the notch 26 is used as a support during the final cutting of the conducting wire.
  • the end 12 is only welded over a part of the length of the component, that is to say over a part of the length of the profile 16, the heating power, for carrying out the welding, is limited.
  • the coil 11, the wire 10 and the tab 25 are embedded in a resin molded to form the parallelepipedic body 13 of the inductor ( Figure 2).
  • a tab 40 projects from the free edge 39 of the branch 19. This tab 40, shorter in length than the section 16, is inclined obliquely towards the inside of the body of the component.
  • one branch, or both branches, of the section 16,17 is extended outside the body of the component by a connection lug or lug 41.
  • the tab 251 has a hole 42 leaving the passage at the end 12 of the wire after welding against the outer face of said tab 251.
  • the hole 42 is closer to the edge 281 than to the edge 291 so that the length of wire welded between this hole 42 and the edge 291 is sufficiently large.
  • the sections 282 and 292 of the tab 252 are extended upwards, that is to say away from the section 16, by oblique edges, respectively 43 and 44, increasing in its upper part the width of the tab and constituting spoilers improving the attachment of the wire.
  • the tab 253 has a notch 45 with oblique edges playing a role similar to that of the notch 27 of Figure 1.
  • This oblique notch 45 opens in the area of the corner between the edge 303 and the slice 293.
  • the tab 254 has a notch 46 with vertical edges opening into the edge 304.
  • This slot 46 has a role similar to that of the hole 42 ( Figure 3). Like the latter, it is closer to the 284 section than to the 294 section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)

Description

L'invention est relative à un composant de circuit, notamment une micro-inductance, presentant, noyé dans un corps, au moins un conducteur d'extrémité soudé à une patte plane à l'intérieur du corps et qui fait partie d'une borne de sortie, le soudage étant effectué sur une face plane de la patte. Un tel composant est par exemple connu du document US-A-4 064 472. On connait aussi du document DE-A-3 513 171 un composant, où l'extrémité du fil conducteur est fixée par ancrage à la patte.The invention relates to a circuit component, in particular a micro-inductor, having, embedded in a body, at least one end conductor soldered to a flat tab inside the body and which is part of a terminal. outlet, welding being carried out on a flat face of the tab. Such a component is for example known from document US-A-4,064,472. We also know from document DE-A-3,513,171 a component, where the end of the conductive wire is fixed by anchoring to the tab.

Les composants de circuit présentent, pour leur connexion électrique, soit des extrémités filaires, soit des pattes ou cosses, plates le plus souvent. Dans ce dernier cas, les bornes sont en saillie du corps du composant ou selon une face extérieure de ce corps. L'invention se rapporte de préférence (mais non exclusivement) à cette dernière sorte de composant qui ne présente pas de borne en saillie. L'encombrement d'un tel composant est réduit, sans compromettre la facilité de connexion à un substrat, par exemple un circuit imprimé ; en effet pour le soudage du composant, qui en général présente deux bornes de connexion sur la même face, il suffit de le poser sur les parties conductrices correspondantes du substrat puis d'effectuer un soudage à la vague.The circuit components have, for their electrical connection, either wire ends or lugs or lugs, which are generally flat. In the latter case, the terminals protrude from the body of the component or along an external face of this body. The invention preferably relates (but not exclusively) to the latter kind of component which does not have a projecting terminal. The size of such a component is reduced, without compromising the ease of connection to a substrate, for example a printed circuit; indeed for the welding of the component, which in general has two connection terminals on the same face, it suffices to place it on the corresponding conductive parts of the substrate and then to perform wave welding.

On connaît une micro-inductance dans laquelle chaque extrémité du fil bobiné est soudée, dans le corps du composant, à une patte connectée à la borne extérieure correspondante.A micro-inductor is known in which each end of the wound wire is soldered, in the body of the component, to a lug connected to the corresponding external terminal.

L'invention résulte de la constatation que les contraintes thermiques imposées au composant lors du soudage des bornes de connexion externe, risquent d'altérer la soudure, à l'intérieur de ce composant, des fils conducteurs aux pattes correspondantes à l'intérieur de ce composant.The invention results from the observation that the thermal stresses imposed on the component when welding the external connection terminals, risk altering the soldering, inside this component, of the conductive wires with the corresponding tabs inside this component.

Pour remédier à cet inconvénient dans le composant de l'invention celui-ci est caractérisé en ce que le soudage de l'extrémité du fil conducteur est combiné a un accrochage de cette extrémité à la patte, cet accrochage étant effuctué en un emplacement distinct de celui où est effectuée la soudure et étant tel que l'extrémité du fil conducteur passe d'une face à l'autre de la patte.To overcome this drawback in the component of the invention, it is characterized in that the welding of the end of the conductive wire is combined with an attachment of this end to the tab, this attachment being effected at a location separate from the one where the welding is carried out and being such that the end of the conductive wire passes from one face to the other of the tab.

Dans le mode de réalisation préféré de l'invention, pour améliorer l'accrochage, le fil conducteur traverse la patte interne grâce à un trou ou une fente que présente cette patte. On peut également prévoir, également pour un bon accrochage, aux extrémités de la patte interne des saillies ou becquets de retenue du fil conducteur.In the preferred embodiment of the invention, to improve the attachment, the conductive wire crosses the tab internal thanks to a hole or a slot that this tab has. Provision may also be made, also for good attachment, at the ends of the internal tab of the projections or spoilers retaining the conductive wire.

D'autres caractéristiques et avantages de l'invention, apparaîtront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :

  • La figure 1 est une vue en perspective d'une micro-inductance selon l'invention en cours de fabrication,
  • La figure 2 est un schéma en perspective d'une micro-inductance terminée, et
  • les figures 3 à 6 montrent des variantes d'une patte d'une micro-inductance du type de celle de la figure 1.
Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
  • FIG. 1 is a perspective view of a micro-inductor according to the invention during manufacture,
  • FIG. 2 is a perspective diagram of a completed micro-inductor, and
  • FIGS. 3 to 6 show variants of a tab of a micro-inductor of the type of that of FIG. 1.

L'exemple de réalisation de l'invention qu'on va décrire en relation avec les figures est une micro-inductance formée d'un fil 10 bobiné sur une carcasse 11 qui est raccordé par ses extrémités (dont une seule 12 est représentée sur la figure 1) à des bornes de connexion dont chacune présente une face pratiquement dans le même plan qu'une paroi extérieure 20 du corps 13 du composant (figure 2).The embodiment of the invention which will be described in relation to the figures is a micro-inductance formed of a wire 10 wound on a carcass 11 which is connected by its ends (of which only one 12 is shown in the Figure 1) to connection terminals, each of which has a face substantially in the same plane as an outer wall 20 of the body 13 of the component (Figure 2).

Le composant se présente, une fois terminé, comme un bloc parallélépipédique de résine avec, selon deux arêtes 14 et 15, des profilés respectivement 16 et 17 à deux branches 18 et 19 (figure 1) perpendiculaires.The component appears, when finished, as a parallelepipedic block of resin with, along two edges 14 and 15, sections 16 and 17 respectively with two branches 18 and 19 (FIG. 1) perpendicular.

Pour la connexion à un circuit extérieur on dépose par exemple la face 20 présentant les branches 19 et 19' sur une plaquette de circuit imprimé. Les branches 19 et 19' reposent alors sur des conducteurs de la plaquette et la fixation est effectuée par la technique dite de soudage à la vague.For connection to an external circuit, for example, the face 20 having the branches 19 and 19 ′ is deposited on a printed circuit board. The branches 19 and 19 ′ then rest on conductors of the wafer and the fixing is carried out by the technique known as wave welding.

L'invention concerne la connexion de chaque fil conducteur 12 au profilé 16 correspondant. Sur la figure 1 on n'a représenté en détail que le profilé 16, le profilé 17 étant symétrique du profilé 16 par rapport à un plan médian longitudinal du composant.The invention relates to the connection of each conductive wire 12 to the corresponding profile 16. In FIG. 1, only the profile 16 has been shown in detail, the profile 17 being symmetrical with the profile 16 with respect to a median plane. longitudinal of the component.

Pour la connexion de l'extrémité 12 du fil bobiné 10 au profilé 16, ce dernier présente une patte 25 en saillie de l'arête libre 24 de la branche 18 ; cette patte 25 s'étend seulement sur une partie de la longueur de la branche 18. Elle est plus rapprochée d'une extrémité 18₁ de cette branche 18 que de l'autre extrémité 18₂. La patte 25 est inclinée en oblique vers l'intérieur du composant alors que la branche 18 est dans le même plan qu'une face externe 23 du corps du composant.For the connection of the end 12 of the wound wire 10 to the section 16, the latter has a tab 25 projecting from the free edge 24 of the branch 18; this tab 25 extends only over a part of the length of the branch 18. It is closer to one end 18₁ of this branch 18 than to the other end 18₂. The tab 25 is inclined obliquely towards the interior of the component while the branch 18 is in the same plane as an external face 23 of the body of the component.

Cette patte 25 présente deux encoches 26 et 27 dont l'une débouche sur une tranche 28 perpendiculaire à l'arête 14 alors que la seconde encoche débouche dans la tranche opposée 29. Le bord libre 30 de la patte 25 est parallèle à l'arête 14.This tab 25 has two notches 26 and 27, one of which opens onto a edge 28 perpendicular to the edge 14 while the second notch opens into the opposite edge 29. The free edge 30 of the tab 25 is parallel to the edge 14.

L'extrémité 12 du fil 10 part du côté de la face interne de la patte 25 pour aller du côté externe de cette patte, ce premier passage s'effectuant dans l'encoche 27. Ensuite cette extrémité présente un brin 33 soudé contre la face externe de la partie 34 de la patte 25 qui se trouve entre les encoches 26 et 27. Ce brin 33 se poursuit par une extrémité qui est appliquée contre la face interne de la patte 25 en s'appuyant au passage contre le fond de l'encoche 26.The end 12 of the wire 10 leaves from the side of the internal face of the tab 25 to go to the external side of this tab, this first passage taking place in the notch 27. Then this end has a strand 33 welded against the face external part 34 of the tab 25 which is located between the notches 26 and 27. This strand 33 continues with an end which is applied against the internal face of the tab 25 while pressing against the bottom of the notch 26.

L'accrochage, complété par le soudage, de l'extrémité 12 du fil conducteur 10 à la patte 25 grâce aux encoches 26 et 27 assure une liaison fiable de cette extrémité à la patte.The attachment, completed by welding, of the end 12 of the conductive wire 10 to the tab 25 by means of the notches 26 and 27 ensures a reliable connection from this end to the tab.

L'arête supérieure de l'encoche 26 est utilisée comme appui lors de la coupe finale du fil conducteur.The upper edge of the notch 26 is used as a support during the final cutting of the conducting wire.

Par ailleurs, comme l'extrémité 12 n'est soudée que sur une partie de la longueur du composant, c'est-à-dire sur une partie de la longueur du profilé 16, la puissance du chauffage, pour effectuer la soudure, est limitée.Furthermore, since the end 12 is only welded over a part of the length of the component, that is to say over a part of the length of the profile 16, the heating power, for carrying out the welding, is limited.

La bobine 11, le fil 10 et la patte 25 sont noyés dans une résine moulée pour former le corps parallélépipédique 13 de l'inductance (figure 2).The coil 11, the wire 10 and the tab 25 are embedded in a resin molded to form the parallelepipedic body 13 of the inductor (Figure 2).

Pour améliorer encore l'accrochage de chaque profilé à la résine une patte 40 est en saillie du bord libre 39 de la branche 19. Cette patte 40, de plus courte longueur que le profilé 16, est inclinée en oblique vers l'intérieur du corps du composant.To further improve the attachment of each profile to the resin, a tab 40 projects from the free edge 39 of the branch 19. This tab 40, shorter in length than the section 16, is inclined obliquely towards the inside of the body of the component.

Dans une variante une branche, ou les deux branches, du profilé 16,17 est prolongée à l'extérieur du corps du composant par une patte ou cosse de connexion 41.In a variant, one branch, or both branches, of the section 16,17 is extended outside the body of the component by a connection lug or lug 41.

Dans la variante représentée sur la figure 3 à la place des encoches 26 et 27 la patte 25₁ présente un trou 42 laissant le passage à l'extrémité 12 du fil après son soudage contre la face externe de ladite patte 25₁ . Le trou 42 est plus proche de la tranche 28₁ que de la tranche 29₁ afin que la longueur de fil soudé entre ce trou 42 et la tranche 29₁ soit suffisamment importante.In the variant shown in Figure 3 in place of the notches 26 and 27 the tab 25₁ has a hole 42 leaving the passage at the end 12 of the wire after welding against the outer face of said tab 25₁. The hole 42 is closer to the edge 28₁ than to the edge 29₁ so that the length of wire welded between this hole 42 and the edge 29₁ is sufficiently large.

Dans l'exemple de la figure 4 les tranches 28₂ et 29₂ de la patte 25₂ sont prolongées vers le haut, c'est-à-dire en s'éloignant du profilé 16, par des arêtes obliques, respectivement 43 et 44, augmentant dans sa partie supérieure la largeur de la patte et constituant des becquets améliorant l'accrochage du fil.In the example of FIG. 4, the sections 28₂ and 29₂ of the tab 25₂ are extended upwards, that is to say away from the section 16, by oblique edges, respectively 43 and 44, increasing in its upper part the width of the tab and constituting spoilers improving the attachment of the wire.

Dans le mode de réalisation représenté sur la figure 5 la patte 25₃ présente une encoche 45 à bords obliques jouant un rôle analogue à celui de l'encoche 27 de la figure 1. Cette encoche oblique 45 débouche dans la zone du coin entre l'arête 30₃ et la tranche 29₃ .In the embodiment shown in Figure 5 the tab 25₃ has a notch 45 with oblique edges playing a role similar to that of the notch 27 of Figure 1. This oblique notch 45 opens in the area of the corner between the edge 30₃ and the slice 29₃.

Enfin dans l'exemple de la figure 6 la patte 25₄ comporte une encoche 46 à bords verticaux débouchant dans l'arête 30₄ . Cette fente 46 a un rôle analogue à celui du trou 42 (figure 3). Comme ce dernier elle se trouve plus proche de la tranche 28₄ que de la tranche 29₄.Finally, in the example of FIG. 6, the tab 25₄ has a notch 46 with vertical edges opening into the edge 30₄. This slot 46 has a role similar to that of the hole 42 (Figure 3). Like the latter, it is closer to the 28₄ section than to the 29₄ section.

Claims (8)

  1. An electrical component, particularly a micro-inductor, having, concealed in a body (13), at least one end conductor (12) soldered to a flat lug (25) inside the body and forming part of an output terminal (16), the soldering being carried out on a plane face of the lug , characterised in that the soldering of the end (12) of the conductor wire is combined with hooking this end to the lug, this hooking being carried out at a location distinct from that where the soldering is carried out, and being such that the end of the conductor wire passes from one face of the lug to the other.
  2. A component according to Claim 1, characterised in that the tab (25) has an opening (42) or a slot or notch (26, 27; 45; 46) allowing the end (12) of the conductor wire to pass from one face of the lug (25) to the other.
  3. A component according to Claim 1 or 2, characterised in that, at least at one of its ends, the lug has a projection, edge or notch (43, 44; 26, 27) for holding the conductor wire.
  4. A component according to Claims 2 and 3, characterised in that the conductor wire is held by an edge of a notch or slot for the passage of the end of the conductor wire on either side of the lug.
  5. A component according to any one of the preceding claims, characterised in that the lug (25) extends only over part of the length of the component.
  6. A component according to any one of the preceding claims, characterised in that, this component having a generally parallelepipedic external form, the output terminal (16, 17) comprises a square-shaped profile, one edge of which is merged with an edge (14, 15) of the parallelepiped, and in that the tab (25) projects from one edge (24) of one of the branches (18) of the profile and is inclined towards the inside of the component body.
  7. A component according to Claim 6, characterised in that the second branch (19) of the profile (16) has another lug (40) also inclined towards the inside of the component body.
  8. A component according to Claim 6 or 7, characterised in that the profile has another lug (41) projecting from the component body.
EP19870402512 1986-11-07 1987-11-06 Inductor Expired - Lifetime EP0270417B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8615579A FR2606544B1 (en) 1986-11-07 1986-11-07 INDUCTANCE
FR8615579 1986-11-07

Publications (2)

Publication Number Publication Date
EP0270417A1 EP0270417A1 (en) 1988-06-08
EP0270417B1 true EP0270417B1 (en) 1993-01-27

Family

ID=9340654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870402512 Expired - Lifetime EP0270417B1 (en) 1986-11-07 1987-11-06 Inductor

Country Status (4)

Country Link
EP (1) EP0270417B1 (en)
DE (1) DE3783881T2 (en)
ES (1) ES2037099T3 (en)
FR (1) FR2606544B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713147C2 (en) 1997-03-27 1999-09-09 Siemens Matsushita Components Chip inductance
AU2003270988A1 (en) * 2002-12-19 2004-07-08 Canon Kabushiki Kaisha Electrical Device, Transformer, and Inductor, and Method of Manufacturing Electrical Device
DE102012201847A1 (en) * 2012-02-08 2013-08-08 Würth Elektronik eiSos Gmbh & Co. KG Electronic component

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR994399A (en) * 1949-06-30 1951-11-15 Device for mounting high frequency windings for radio reception, in a protective enclosure
US4064472A (en) * 1976-04-08 1977-12-20 Vanguard Electronics Company, Inc. Compact inductor
US4704592A (en) * 1984-09-13 1987-11-03 Siemens Aktiengesellschaft Chip inductor electronic component
DE3513171A1 (en) * 1985-04-12 1986-10-16 Siemens AG, 1000 Berlin und 8000 München Method and device for flux-free soldering of electrical winding ends to electrical connecting elements of electrical components, especially coils and wire resistors

Also Published As

Publication number Publication date
EP0270417A1 (en) 1988-06-08
DE3783881D1 (en) 1993-03-11
ES2037099T3 (en) 1993-06-16
FR2606544B1 (en) 1990-05-18
FR2606544A1 (en) 1988-05-13
DE3783881T2 (en) 1993-05-19

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