EP3850710B1 - Electronic device comprising elastic connection pins - Google Patents

Electronic device comprising elastic connection pins Download PDF

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Publication number
EP3850710B1
EP3850710B1 EP19769152.0A EP19769152A EP3850710B1 EP 3850710 B1 EP3850710 B1 EP 3850710B1 EP 19769152 A EP19769152 A EP 19769152A EP 3850710 B1 EP3850710 B1 EP 3850710B1
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EP
European Patent Office
Prior art keywords
blind holes
holes
pins
series
curved
Prior art date
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Active
Application number
EP19769152.0A
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German (de)
French (fr)
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EP3850710A1 (en
Inventor
François Guillot
Pascal SPOOR
Olivier Roche
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Safran Electronics and Defense SAS
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Safran Electronics and Defense SAS
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Publication of EP3850710A1 publication Critical patent/EP3850710A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/75—Coupling devices for rigid printing circuits or like structures connecting to cables except for flat or ribbon cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6473—Impedance matching

Definitions

  • the present invention relates to the field of electronics and more particularly to the field of electrical connection in electronic devices.
  • a pin is generally made of conductive metal and comprises an end section that is elastically deformable in a direction transverse to a longitudinal direction of the pin in such a way that the end section has two outer surface portions, diametrically opposed to each other. the other, which are capable of being elastically brought closer together.
  • the end segment can thus be engaged by force in the metallized hole and the elasticity makes it possible to ensure permanent contact between the conductive coating of the metallized hole and the outer surface portions of the end segment of the pin.
  • pins are known. The most common for common applications are, for example, split pins with a round section or so-called “banana” pins.
  • spindles cannot be used for applications in which the spindles are more stressed (mechanical, vibratory, thermal constraints, etc.) and in particular in aeronautics where the resistance to these stresses is the subject of standards such as the ARINC 600 standard.
  • connectors of the "PRESS-FIT" type comprising pins whose end section has a so-called “needle-cat" shape, that is to say that the end section comprises, between a proximal solid part and a distal solid part, an intermediate part comprising two outwardly arcuate blades so as to have outer surface portions separated from each other by a distance greater than the greatest transverse dimension from the rest of the end section.
  • the blades have first converging ends connected to the proximal solid portion and second converging ends connected to the distal solid part, the outer surface portions providing contact with the metallized hole located on an intermediate part of the blades which is curved.
  • a disadvantage is that this type of pin can be relatively expensive to manufacture to ensure a reliable connection under certain conditions of use.
  • the metallized hole must be long enough to accommodate the distal part and the intermediate part of the end section of the pin, ensuring that the outer surface portions in contact with the electrically conductive coating of the metallized hole are sufficiently engaged in the metallized hole so as not to risk being extracted therefrom under the effect of the stresses applied to the connector and/or to the printed circuit board.
  • the point of contact of the outer surface portions of the pin with the electrically conductive coating of the metallized hole must be at a minimum depth of 0.3 mm with respect to the entry of the metallized hole.
  • the pins of the current connectors generate an iterative break in impedance, or “stub effect”, in the matched lines (therefore with iterative impedance).
  • An object of the invention is to provide an electrical connector pin ensuring a reliable connection.
  • a high-frequency electronic device comprising: a printed circuit board having conductive tracks and at least a first series of blind holes which extend from a first face of the board and which are each provided with an electrically conductive coating connected to at least one of the conductive tracks; and at least one connector which extends from the side of the first face and which comprises a base and pins having a connection section to the base and a free end section.
  • the end segment has a cross-section presenting at least one curved portion around an axis parallel to a longitudinal direction of the end segment and the end segment having side edges which are provided with electrical contact portions and which can be brought together by causing an elastic deformation of the curved portion, the end sections of the pins each being received in one of the holes of the first series of blind holes and the curved portion being elastically deformed in such a way so that the contact portions are elastically applied against the electrically conductive coating.
  • the structure of the pins is relatively simple and the pressure exerted by the contact portions on the surface of the coating of the hole intended to receive the pin can be adjusted by acting on the curvature of the curved portion, the thickness of the end section and/or the choice of material.
  • This shape allows the pin to be sufficiently rigid during its introduction into the hole but also in use once connected while ensuring reliable electrical contact.
  • This structure also makes it possible to have a relatively short end section that can be accommodated in blind holes and more generally in holes of relatively short length (in particular compared to current solutions of the “PRESS-FIT” type). In the high-frequency electronic device, the stub effects will be limited.
  • each of the blind holes interconnects two conductive tracks forming a differential line.
  • the cross section comprises two curved portions around an axis parallel to a longitudinal direction of the end section, the two portions being inverted with respect to each other, the cross section preferably being substantially in the shape of S flattened.
  • the end section comprises a bevelled and/or rounded end part.
  • the plate comprises a second series of blind holes extending opposite the first series of blind holes.
  • PCB printed circuit board
  • the conductive tracks 3 are connected to high-frequency electronic components not shown and form a high-frequency circuit.
  • the holes are a first series of blind holes 4.1 and a second series of blind holes 4.1 which extend facing each other from faces 2.1, 2.2 of substrate 2 opposite to each other.
  • the blind holes 4.1 of each pair of holes facing each other are coaxial with each other and have their ends separated by a distance of approximately 0.4 mm.
  • Each of the blind holes 4.1 interconnects two conductive tracks forming a differential line.
  • the other holes 4.2 are through to open on the two faces 2.1, 2.2.
  • the substrate here has a thickness of 3.2 mm and the holes 4.1 a depth of approximately 1.4 mm.
  • the holes 4.1, 4.2 of each series are spaced from each other by a distance of approximately 2.54 mm.
  • the device comprises connectors 10 comprising a base 11 to which pins generally designated as 12 are fixed.
  • the fixing of the connecting sections 12.1 to the base 11 is carried out in a manner known per se, for example by overmoulding.
  • the electrical connection of each connecting section 12.1 to the electrical cables 13 is made in a manner known per se, for example by brazing.
  • the connecting section 12.1 and the end section 12.2 are here made in one piece of metal.
  • the metal used here is one of the following alloys: CuSn4, CuSn6, CuNiSi, CuCrAgFeTiSi.
  • Each pin 12 is made by cutting a sheet of the metal indicated. Provision is made for a surface treatment by depositing a layer of Nickel with a thickness of around 1.5 ⁇ m with a so-called “flash Nickel” finish over a thickness of around 0.3 to 1.0 ⁇ m.
  • Flash Nickel flash Nickel
  • Pin 12 has a flat elongated shape.
  • flat it is meant that pin 12 has a thickness smaller than its width measured perpendicular to its longitudinal direction.
  • the end section 12.2 of the spindle 12 is made from an initially rectangular cross-section blade which has been deformed to finally present here a wavy shape.
  • the cross section has two curved portions 14, 15 around an axis parallel to a longitudinal direction of the end section 12.2.
  • the two curved portions 14, 15 are inverted relative to each other and the cross section is substantially flattened S-shaped.
  • the end section 12.2 thus has side edges forming electrical contact portions which can be brought closer together by causing an elastic deformation of the curved portions 14, 15.
  • the end section includes an end part 12.3 which here is bevelled. As a variant, the end part 12.3 is rounded.
  • the connectors are mounted on the electronic card 1 by engaging the end sections 12.2 in the holes 4.1, 4.2. In doing so, the transverse deformation of the end sections 12.2 is caused, which causes the lateral edges 16 to come together. This deformation results in an accentuation of the curvature of the curved portions 14, 15. This deformation is carried out gradually due to the shape of the end part 15.3, the bevels also facilitating the centering of the pin in the hole. It will be noted that the force necessary for the deformation of the curved portions 14, 15 depends in particular on the thickness of the blade forming the end section 12.2 and on the initial curvature of the curved portions 14, 15.
  • said thickness will be determined and the initial curvature as a function of the desired insertion force and the desired pressure for applying the side edges 16 against the internal coating 5.
  • the end sections of the pins are driven into the holes with a length between 0.3 mm and 1.4 mm, preferably about 0.85 mm.
  • the end sections 12.2 of the pins 12 are each received in a hole 4.1, 4.2 and remain elastically deformed transversely in such a way that the side edges 16 are elastically applied over their entire length against the electrically conductive coating 5.
  • the fact that the side edges 16 of the end section are in contact over their entire length with the internal coating of the hole limits the risk of an excessively localized concentration of stress which could result in deterioration of the coating.
  • corrugated shape of the cross-section of the end segment provides it with rigidity and relatively good resistance to buckling, facilitating the operation of inserting the end segment into the hole.
  • the side edges 16 are each provided with a contact portion 17 projecting from the rest of the side edge concerned.
  • the contact portions 17 are here triangular in shape and are located in the end part 12.3, the bevels extending in the extension of a front surface of the contact portions.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)

Description

La présente invention concerne le domaine de l'électronique et plus particulièrement le domaine du raccordement électrique dans les dispositifs électroniques.The present invention relates to the field of electronics and more particularly to the field of electrical connection in electronic devices.

ARRIERE-PLAN TECHNOLOGIQUETECHNOLOGICAL BACKGROUND

Il est connu de raccorder un composant ou dispositif électronique à une plaque de circuit imprimé (communément appelée PCB) en utilisant un connecteur pourvu de broches destinées à être engagées dans des trous qui ont été ménagés dans la plaque de circuit imprimé et qui possèdent une surface interne recouverte d'un revêtement électriquement conducteur relié à des pistes conductrices du circuit imprimé. On parle de trous ou vias métallisés. Un tel connecteur est connu du document US 9136624 B1 .It is known to connect an electronic component or device to a printed circuit board (commonly called a PCB) using a connector provided with pins intended to be engaged in holes which have been made in the printed circuit board and which have a surface internal covered with an electrically conductive coating connected to the conductive tracks of the printed circuit. We are talking about metallized holes or vias. Such a connector is known from the document US 9136624 B1 .

Une broche est généralement réalisée en métal conducteur et comprend un tronçon d'extrémité élastiquement déformable dans un sens transversal à une direction longitudinale de la broche de telle manière que le tronçon d'extrémité ait deux portions de surface extérieures, diamétralement opposées l'une à l'autre, qui sont susceptibles d'être élastiquement rapprochées l'une de l'autre. Le tronçon d'extrémité peut ainsi être engagé à force dans le trou métallisé et l'élasticité permet d'assurer un contact permanent entre le revêtement conducteur du trou métallisé et les portions de surfaces extérieures du tronçon d'extrémité de la broche.A pin is generally made of conductive metal and comprises an end section that is elastically deformable in a direction transverse to a longitudinal direction of the pin in such a way that the end section has two outer surface portions, diametrically opposed to each other. the other, which are capable of being elastically brought closer together. The end segment can thus be engaged by force in the metallized hole and the elasticity makes it possible to ensure permanent contact between the conductive coating of the metallized hole and the outer surface portions of the end segment of the pin.

Plusieurs formes de broches sont connues. Les plus courantes pour les applications usuelles sont par exemple les broches fendues de section ronde ou les broches dites « banane ».Several forms of pins are known. The most common for common applications are, for example, split pins with a round section or so-called “banana” pins.

Ces broches ne sont pas utilisables pour des applications dans lesquelles les broches sont plus sollicitées (contraintes mécaniques, vibratoires, thermiques...) et notamment dans l'aéronautique où la résistance à ces contraintes fait l'objet de normes telles que la norme ARINC 600.These spindles cannot be used for applications in which the spindles are more stressed (mechanical, vibratory, thermal constraints, etc.) and in particular in aeronautics where the resistance to these stresses is the subject of standards such as the ARINC 600 standard.

Pour ces applications, il est connu des connecteurs de type « PRESS-FIT » comportant des broches dont le tronçon d'extrémité a une forme dite en « chat d'aiguille », c'est-à-dire que le tronçon d'extrémité comprend, entre une partie massive proximale et une partie massive distale, une partie intermédiaire comportant deux lames arquées vers l'extérieur pour avoir des portions de surface extérieure écartées l'une de l'autre d'une distance supérieure à la plus grande dimension transversale du reste du tronçon d'extrémité. Les lames ont des premières extrémités convergentes reliées à la portion massive proximale et des deuxièmes extrémités convergentes reliées à la partie massive distale, les portions de surface extérieure assurant le contact avec le trou métallisé se trouvant sur une partie intermédiaire des lames qui est incurvée.For these applications, connectors of the "PRESS-FIT" type are known comprising pins whose end section has a so-called "needle-cat" shape, that is to say that the end section comprises, between a proximal solid part and a distal solid part, an intermediate part comprising two outwardly arcuate blades so as to have outer surface portions separated from each other by a distance greater than the greatest transverse dimension from the rest of the end section. The blades have first converging ends connected to the proximal solid portion and second converging ends connected to the distal solid part, the outer surface portions providing contact with the metallized hole located on an intermediate part of the blades which is curved.

Un inconvénient est que ce type de broche peut se révéler relativement coûteux à fabriquer pour assurer une connexion fiable dans certaines conditions d'utilisation.A disadvantage is that this type of pin can be relatively expensive to manufacture to ensure a reliable connection under certain conditions of use.

Un autre inconvénient de ce type de broche est que le trou métallisé doit avoir une longueur suffisante pour accueillir la partie distale et la partie intermédiaire du tronçon d'extrémité de la broche en assurant que les portions de surface extérieure en contact avec le revêtement électriquement conducteur du trou métallisé sont suffisamment engagées dans le trou métallisé pour ne pas risquer d'en être extraites sous l'effet des contraintes appliqués au connecteur et/ou à la plaque de circuit imprimé. Ainsi, on considère que le point de contact des portions de surface extérieure de la broche avec le revêtement électriquement conducteur du trou métallisé doit so trouver à une profondeur minimale de 0,3 mm par rapport à l'entrée du trou métallisé.Another disadvantage of this type of pin is that the metallized hole must be long enough to accommodate the distal part and the intermediate part of the end section of the pin, ensuring that the outer surface portions in contact with the electrically conductive coating of the metallized hole are sufficiently engaged in the metallized hole so as not to risk being extracted therefrom under the effect of the stresses applied to the connector and/or to the printed circuit board. Thus, it is considered that the point of contact of the outer surface portions of the pin with the electrically conductive coating of the metallized hole must be at a minimum depth of 0.3 mm with respect to the entry of the metallized hole.

En outre, dans le cas de dispositif électronique hautes fréquences, les broches des connecteurs actuels engendre une rupture d'impédance itérative, ou « effet de stub », dans les lignes adaptée (donc à impédance itérative).In addition, in the case of high-frequency electronic devices, the pins of the current connectors generate an iterative break in impedance, or “stub effect”, in the matched lines (therefore with iterative impedance).

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Un but de l'invention est de fournir une broche de connecteur électrique assurant une connexion fiable.An object of the invention is to provide an electrical connector pin ensuring a reliable connection.

BREF EXPOSE DE L'INVENTIONBRIEF DESCRIPTION OF THE INVENTION

A cet effet, on prévoit, selon l'invention un dispositif électronique haute fréquence comprenant : une plaque de circuit imprimé ayant des pistes conductrices et au moins une première série de trous borgnes qui s'étendent depuis une première face de la plaque et qui sont pourvus chacun d'un revêtement électriquement conducteur raccordé à au moins l'une des pistes conductrices ; et au moins un connecteur qui s'étend du côté de la première face et qui comprend une embase et des broches ayant un tronçon de liaison à l'embase et un tronçon d'extrémité libre. Le tronçon d'extrémité a une section transversale présentant au moins une portion courbée autour d'un axe parallèle à une direction longitudinale du tronçon d'extrémité et le tronçon d'extrémité ayant des bords latéraux qui sont pourvus de portions de contact électrique et qui peuvent être rapprochés l'un de l'autre en provoquant une déformation élastique de la portion courbée, les tronçons d'extrémité des broches étant reçus chacun dans un des trous de la première série de trous borgnes et la portion courbée étant déformée élastiquement de telle manière que les portions de contact soient élastiquement appliquées contre le revêtement électriquement conducteur.To this end, provision is made, according to the invention, for a high-frequency electronic device comprising: a printed circuit board having conductive tracks and at least a first series of blind holes which extend from a first face of the board and which are each provided with an electrically conductive coating connected to at least one of the conductive tracks; and at least one connector which extends from the side of the first face and which comprises a base and pins having a connection section to the base and a free end section. The end segment has a cross-section presenting at least one curved portion around an axis parallel to a longitudinal direction of the end segment and the end segment having side edges which are provided with electrical contact portions and which can be brought together by causing an elastic deformation of the curved portion, the end sections of the pins each being received in one of the holes of the first series of blind holes and the curved portion being elastically deformed in such a way so that the contact portions are elastically applied against the electrically conductive coating.

La structure des broches est relativement simple et la pression qu'exercent les portions de contact sur la surface du revêtement du trou destiné à recevoir la broche peut être ajustée en jouant sur la courbure de la portion courbée, l'épaisseur du tronçon d'extrémité et/ou le choix du matériau. Cette forme permet à la broche d'être suffisamment rigide lors de son introduction dans le trou mais également en utilisation une fois connectée tout en assurant un contact électrique fiable. Cette structure permet en outre d'avoir un tronçon d'extrémité relativement court pouvant être accueilli dans des trous borgnes et plus généralement dans des trous de relativement faible longueur (en particulier par rapport aux solutions actuelles de type « PRESS-FIT »). Dans le dispositif électronique haute-fréquence, les effets de stub vont être limités.The structure of the pins is relatively simple and the pressure exerted by the contact portions on the surface of the coating of the hole intended to receive the pin can be adjusted by acting on the curvature of the curved portion, the thickness of the end section and/or the choice of material. This shape allows the pin to be sufficiently rigid during its introduction into the hole but also in use once connected while ensuring reliable electrical contact. This structure also makes it possible to have a relatively short end section that can be accommodated in blind holes and more generally in holes of relatively short length (in particular compared to current solutions of the “PRESS-FIT” type). In the high-frequency electronic device, the stub effects will be limited.

Selon une caractéristique particulière, chacun des trous borgnes relie entre elles deux pistes conductrices formant une ligne différentielle.According to a particular characteristic, each of the blind holes interconnects two conductive tracks forming a differential line.

Avantageusement, la section transversale comprend deux portions courbées autour d'un axe parallèle à une direction longitudinale du tronçon d'extrémité, les deux portions étant inversées l'une par rapport à l'autre, la section transversale étant de préférence sensiblement en forme de S aplati.Advantageously, the cross section comprises two curved portions around an axis parallel to a longitudinal direction of the end section, the two portions being inverted with respect to each other, the cross section preferably being substantially in the shape of S flattened.

Optionnellement, le tronçon d'extrémité comprend une partie terminale biseautée et/ou arrondie.Optionally, the end section comprises a bevelled and/or rounded end part.

Selon un mode de réalisation préféré, la plaque comprend une deuxième série de trous borgnes s'étendant en vis-à-vis de la première série de trous borgnes.According to a preferred embodiment, the plate comprises a second series of blind holes extending opposite the first series of blind holes.

Selon des caractéristiques optionnelles :

  • les extrémités des trous borgnes en vis-à-vis sont espacées l'une de l'autre d'une distance comprise entre 0,1 mm et 0,4 mm environ ;
  • les tronçons d'extrémité des broches sont enfoncés dans les trous d'une longueur comprise entre 0,3 mm et 1,4 mm, de préférence 0,85 mm environ ;
  • les trous borgnes ont une longueur comprise entre 1,4 mm et 1,6 mm ;
  • les trous de chaque série sont espacés d'une distance de 2,54 mm environ.
According to optional features:
  • the ends of the facing blind holes are spaced apart by a distance between approximately 0.1 mm and 0.4 mm;
  • the end sections of the pins are driven into the holes by a length of between 0.3 mm and 1.4 mm, preferably approximately 0.85 mm;
  • the blind holes have a length between 1.4 mm and 1.6 mm;
  • the holes of each series are spaced by a distance of approximately 2.54 mm.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de réalisation particulier et non limitatif de l'invention.Other characteristics and advantages of the invention will become apparent on reading the following description of a particular and non-limiting embodiment of the invention.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Il sera fait référence aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue en élévation d'une broche selon l'invention ;
  • la figure 2 est une vue en coupe d'un connecteur selon l'invention ;
  • la figure 3 est une vue partielle, en coupe transversale, d'un dispositif électronique selon l'invention ;
  • la figure 4 est une vue en coupe transversale, selon la ligne IV-IV de la figure 1, de la broche de l'invention,
  • la figure 5 est une vue partielle analogue à la figure 1 d'une broche selon une variante de réalisation.
Reference will be made to the attached drawings, among which:
  • the figure 1 is an elevational view of a spindle according to the invention;
  • the picture 2 is a sectional view of a connector according to the invention;
  • the picture 3 is a partial cross-sectional view of an electronic device according to the invention;
  • the figure 4 is a cross-sectional view, along line IV-IV of the figure 1 , of the spindle of the invention,
  • the figure 5 is a partial view analogous to the figure 1 of a pin according to a variant embodiment.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence aux figures 1 à 4, l'invention est ici décrite en application à un dispositif électronique comprenant une plaque de circuit imprimé (ou PCB), généralement désignée en 1, comprenant un substrat électriquement isolant 2 qui porte des pistes électriquement conductrices 3 et qui est pourvu de trous 4.1, 4.2 recouverts chacun par un revêtement interne 5 relié à l'une des pistes électriquement conductrices 3. Les pistes conductrices 3 sont raccordées à des composants électroniques haute-fréquence non représentés et forment un circuit haute fréquence.With reference to figures 1 to 4 , the invention is described here in application to an electronic device comprising a printed circuit board (or PCB), generally designated at 1, comprising an electrically insulating substrate 2 which carries electrically conductive tracks 3 and which is provided with holes 4.1, 4.2 each covered by an internal coating 5 connected to one of the electrically conductive tracks 3. The conductive tracks 3 are connected to high-frequency electronic components not shown and form a high-frequency circuit.

Parmi les trous, se trouvent une première série de trous borgnes 4.1 et une deuxième série de trous borgnes 4.1 qui s'étendent en vis-à-vis depuis des faces 2.1, 2.2 du substrat 2 opposées l'une à l'autre. Les trous borgnes 4.1 de chaque paire de trous en vis-à-vis sont coaxiaux l'un à l'autre et ont leurs extrémités séparées d'une distance de 0,4 mm environ. Chacun des trous borgnes 4.1 relie entre elles deux pistes conductrices formant une ligne différentielle.Among the holes are a first series of blind holes 4.1 and a second series of blind holes 4.1 which extend facing each other from faces 2.1, 2.2 of substrate 2 opposite to each other. The blind holes 4.1 of each pair of holes facing each other are coaxial with each other and have their ends separated by a distance of approximately 0.4 mm. Each of the blind holes 4.1 interconnects two conductive tracks forming a differential line.

Parmi les trous, les autres trous 4.2 sont traversants pour déboucher sur les deux faces 2.1, 2.2.Among the holes, the other holes 4.2 are through to open on the two faces 2.1, 2.2.

Le substrat a ici une épaisseur de 3,2 mm et les trous 4.1 une profondeur de 1,4 mm environ. Les trous 4.1, 4.2 de chaque série sont espacés les uns des autres d'une distance de 2,54 mm environ.The substrate here has a thickness of 3.2 mm and the holes 4.1 a depth of approximately 1.4 mm. The holes 4.1, 4.2 of each series are spaced from each other by a distance of approximately 2.54 mm.

Le dispositif comprend des connecteurs 10 comportant une embase 11 à laquelle sont fixées des broches généralement désignées en 12.The device comprises connectors 10 comprising a base 11 to which pins generally designated as 12 are fixed.

Chaque broche 12 possède :

  • un tronçon de liaison 12.1 fixé à l'embase 11 et connecté à un câble électrique 13 ;
  • un tronçon d'extrémité 12.2 s'étendant dans le prolongement du tronçon de liaison 12.1 et ayant une partie terminale libre 12.3.
Each pin 12 has:
  • a connecting section 12.1 fixed to the base 11 and connected to an electric cable 13;
  • an end section 12.2 extending in the extension of the connecting section 12.1 and having a free end part 12.3.

La fixation des tronçons de liaison 12.1 à l'embase 11 est réalisée de manière connue en elle-même par exemple par surmoulage. Le raccordement électrique de chaque tronçon de liaison 12.1 aux câbles électriques 13 est réalisé de manière connue en elle-même par exemple par brasage.The fixing of the connecting sections 12.1 to the base 11 is carried out in a manner known per se, for example by overmoulding. The electrical connection of each connecting section 12.1 to the electrical cables 13 is made in a manner known per se, for example by brazing.

Le tronçon de liaison 12.1 et le tronçon d'extrémité 12.2 sont ici réalisés d'une seule pièce en métal. Le métal utilisé est ici l'un des alliages suivants : CuSn4, CuSn6, CuNiSi, CuCrAgFeTiSi. Chaque broche 12 est fabriquée par découpage d'une tôle du métal indiqué. Il est prévu un traitement de surface par dépôt d'une couche de Nickel d'une épaisseur d'environ 1,5 µm avec une finition dite par « flash Nickel » sur une épaisseur de 0,3 à 1,0 µm environ. D'autres matériaux électriquement conducteurs, en particulier des métaux et alliages, sont bien évidemment envisageables.The connecting section 12.1 and the end section 12.2 are here made in one piece of metal. The metal used here is one of the following alloys: CuSn4, CuSn6, CuNiSi, CuCrAgFeTiSi. Each pin 12 is made by cutting a sheet of the metal indicated. Provision is made for a surface treatment by depositing a layer of Nickel with a thickness of around 1.5 μm with a so-called “flash Nickel” finish over a thickness of around 0.3 to 1.0 μm. Other electrically conductive materials, in particular metals and alloys, can of course be envisaged.

La broche 12 a une forme allongée plate. Par « plate », on entend que la broche 12 a une épaisseur plus faible que sa largeur mesurée perpendiculaire à sa direction longitudinale.Pin 12 has a flat elongated shape. By “flat”, it is meant that pin 12 has a thickness smaller than its width measured perpendicular to its longitudinal direction.

Le tronçon d'extrémité 12.2 de la broche 12 est réalisé à partir d'une lame de section transversale initialement rectangulaire qui a été déformée pour présenter finalement ici une forme ondulée.The end section 12.2 of the spindle 12 is made from an initially rectangular cross-section blade which has been deformed to finally present here a wavy shape.

La section transversale présente deux portions courbées 14, 15 autour d'un axe parallèle à une direction longitudinale du tronçon d'extrémité 12.2. Les deux portions courbées 14, 15 sont inversées l'une par rapport à l'autre et la section transversale est sensiblement en forme de S aplati.The cross section has two curved portions 14, 15 around an axis parallel to a longitudinal direction of the end section 12.2. The two curved portions 14, 15 are inverted relative to each other and the cross section is substantially flattened S-shaped.

Le tronçon d'extrémité 12.2 a ainsi des bords latéraux formant des portions de contact électrique qui peuvent être rapprochés l'un de l'autre en provoquant une déformation élastique des portions courbées 14, 15.The end section 12.2 thus has side edges forming electrical contact portions which can be brought closer together by causing an elastic deformation of the curved portions 14, 15.

Le tronçon d'extrémité comprend une partie terminale 12.3 qui est ici biseautée. En variante, la partie terminale 12.3 est arrondie.The end section includes an end part 12.3 which here is bevelled. As a variant, the end part 12.3 is rounded.

Les connecteurs sont montés sur la carte électronique 1 en engageant les tronçons d'extrémité 12.2 dans les trous 4.1, 4.2. Ce faisant, on provoque la déformation transversale des tronçons d'extrémité 12.2, ce qui provoque le rapprochement des bords latéraux 16. Cette déformation se traduit par une accentuation de la courbure des portions courbées 14, 15. Cette déformation est réalisée progressivement du fait de la forme de la partie terminale 15.3, les biseaux facilitant également le centrage de la broche dans le trou. On notera que l'effort nécessaire à la déformation des portions courbées 14, 15 dépend notamment de l'épaisseur de la lame formant le tronçon d'extrémité 12.2 et de la courbure initiale des portions courbées 14, 15. Ainsi, on déterminera ladite épaisseur et la courbure initiale en fonction de l'effort d'insertion souhaité et de la pression recherchée d'application des bords latéraux 16 contre le revêtement interne 5. Les tronçons d'extrémité des broches sont enfoncés dans les trous d'une longueur comprise entre 0,3 mm et 1,4 mm, de préférence 0,85 mm environ.The connectors are mounted on the electronic card 1 by engaging the end sections 12.2 in the holes 4.1, 4.2. In doing so, the transverse deformation of the end sections 12.2 is caused, which causes the lateral edges 16 to come together. This deformation results in an accentuation of the curvature of the curved portions 14, 15. This deformation is carried out gradually due to the shape of the end part 15.3, the bevels also facilitating the centering of the pin in the hole. It will be noted that the force necessary for the deformation of the curved portions 14, 15 depends in particular on the thickness of the blade forming the end section 12.2 and on the initial curvature of the curved portions 14, 15. Thus, said thickness will be determined and the initial curvature as a function of the desired insertion force and the desired pressure for applying the side edges 16 against the internal coating 5. The end sections of the pins are driven into the holes with a length between 0.3 mm and 1.4 mm, preferably about 0.85 mm.

Une fois les connecteurs montés sur la carte électronique 1, les tronçons d'extrémité 12.2 des broches 12 sont reçus chacun dans un trou 4.1, 4.2 et restent déformés élastiquement transversalement de telle manière que les bords latéraux 16 sont élastiquement appliqués sur toute leur longueur contre le revêtement électriquement conducteur 5. Le fait que les bords latéraux 16 du tronçon d'extrémité soient contact sur toute leur longueur avec le revêtement interne du trou limite le risque d'une concentration de contrainte trop localisée qui pourrait aboutir à une détérioration du revêtement.Once the connectors have been mounted on the electronic card 1, the end sections 12.2 of the pins 12 are each received in a hole 4.1, 4.2 and remain elastically deformed transversely in such a way that the side edges 16 are elastically applied over their entire length against the electrically conductive coating 5. The fact that the side edges 16 of the end section are in contact over their entire length with the internal coating of the hole limits the risk of an excessively localized concentration of stress which could result in deterioration of the coating.

On notera que la forme ondulée de la section transversale du tronçon d'extrémité apporte à celui-ci de la rigidité et une relativement bonne résistance au flambage, facilitant l'opération d'insertion du tronçon d'extrémité dans le trou.It will be noted that the corrugated shape of the cross-section of the end segment provides it with rigidity and relatively good resistance to buckling, facilitating the operation of inserting the end segment into the hole.

On notera également que la mise en œuvre de trous borgnes 4.1 et do broches 12 relativement courtes permet de maximiser les bandes passantes hautes fréquences par minimisation de l'effet de « stub » des trous métallisés sur les lignes adaptées aux hautes fréquences.It will also be noted that the implementation of relatively short blind holes 4.1 and do pins 12 makes it possible to maximize the high frequency bandwidths by minimization of the "stub" effect of the metallized holes on the lines adapted to high frequencies.

En référence à la figure 5, les bords latéraux 16 sont pourvus chacun d'une portion de contact 17 en saillie du reste du bord latéral concerné. Les portions de contact 17 sont ici de forme triangulaire et sont situées dans la partie terminale 12.3, les biseaux s'étendant dans le prolongement d'une surface frontale des portions de contact.With reference to the figure 5 , the side edges 16 are each provided with a contact portion 17 projecting from the rest of the side edge concerned. The contact portions 17 are here triangular in shape and are located in the end part 12.3, the bevels extending in the extension of a front surface of the contact portions.

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit mais englobe toute variante entrant dans le champ de l'invention telle que définie par les revendications.Of course, the invention is not limited to the embodiment described but encompasses any variant falling within the scope of the invention as defined by the claims.

Claims (11)

  1. A high-frequency electronic device comprising: a printed circuit board (1) having conductive tracks (3) and at least a first series of blind holes (4.1) that extend from a first face of the board and each of which is provided with an electrically conductive coating (5) connected to at least one of the conductive tracks; and at least one connector (10) that extends beside the first face and comprises a base and pins (12), each pin having a link segment (12.1) that is linked to the base and an end segment (12.2) that is free, characterized by the end segment (12.2) having a cross-section presenting at least one curved portion that is curved around an axis parallel to a longitudinal direction of the end segment (12.2) and the end segment (12.2) having side edges (16) that are provided with electrical contact portions and that can be moved towards each other by causing the curved portion to deform elastically, each of the end segments (12.2) of the pins being received in a respective hole of the first series of blind holes (4.1), and said at least one curved portion being deformed elastically in such a manner that the contact portions are pressed elastically against the electrically conductive coating.
  2. A device according to claim 1, wherein each of the blind holes connects together two conductive tracks forming a differential line.
  3. A device according to any preceding claim, wherein the cross-section includes two curved portions (14, 15) curved around respective axes parallel to the longitudinal direction of the end segment (12.2), the two portions being curved in mutually opposite directions.
  4. A device according to claim 3, wherein the cross-section is substantially in the form of a flattened S-shape.
  5. A device according to any preceding claim, wherein the end segment (12.2) includes a terminal portion (12.3) that is chamfered and/or rounded.
  6. A device according to any preceding claim, wherein the board includes a second series of blind holes (4.1) extending facing the first series of blind holes (4.1).
  7. A device according to the preceding claim, wherein the ends of the facing blind holes are spaced apart from each other by a distance of about 0.2 mm.
  8. A device according to any preceding claim, wherein the end segments of the pins are pushed into the holes over a length lying in the range 0.3 mm to 1.4 mm.
  9. A device according to the preceding claim, wherein the end segments of the pins are pushed into the holes over a length of about 0.85 mm
  10. A device according to any preceding claim, wherein the blind holes have a length lying in the range 1.4 mm to 1.6 mm.
  11. A device according to any preceding claim, wherein the holes of each series are spaced apart by a distance of about 2.54 mm.
EP19769152.0A 2018-09-14 2019-09-13 Electronic device comprising elastic connection pins Active EP3850710B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1858314A FR3086110B1 (en) 2018-09-14 2018-09-14 ELASTIC CONNECTION PIN, CONNECTOR AND ELECTRONIC DEVICE INCLUDING SUCH PINs
PCT/EP2019/074589 WO2020053437A1 (en) 2018-09-14 2019-09-13 Electronic device comprising elastic connection pins

Publications (2)

Publication Number Publication Date
EP3850710A1 EP3850710A1 (en) 2021-07-21
EP3850710B1 true EP3850710B1 (en) 2022-10-26

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US (1) US11355873B2 (en)
EP (1) EP3850710B1 (en)
CN (1) CN112640220A (en)
FR (1) FR3086110B1 (en)
WO (1) WO2020053437A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11664626B2 (en) * 2021-07-29 2023-05-30 Dell Products L.P. Staggered press-fit fish-eye connector

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Publication number Priority date Publication date Assignee Title
US3028573A (en) * 1959-05-01 1962-04-03 Automatic Elect Lab Cross-connecting board
US4223970A (en) * 1979-02-26 1980-09-23 Electronics Stamping Corporation Compliant backplane electrical connector
US4415220A (en) * 1981-05-29 1983-11-15 Bell Telephone Laboratories, Incorporated Compliant contact pin
EP0332720A1 (en) * 1988-03-15 1989-09-20 INOVAN GmbH & Co. KG Metalle und Bauelemente Contact pin
US5456608A (en) * 1993-08-25 1995-10-10 Conx Corporation Cross-connect system
DE19831394B4 (en) 1998-07-14 2008-09-11 Marquardt Gmbh Carrier for components
US6593535B2 (en) * 2001-06-26 2003-07-15 Teradyne, Inc. Direct inner layer interconnect for a high speed printed circuit board
US6984135B2 (en) * 2001-10-01 2006-01-10 Molex Incorporated Press fit pin
JP4299184B2 (en) * 2004-04-23 2009-07-22 矢崎総業株式会社 Board connection board terminal
JP5686009B2 (en) * 2011-03-18 2015-03-18 富士通株式会社 Substrate unit and method for manufacturing substrate unit
US9136624B1 (en) * 2013-03-28 2015-09-15 Juniper Networks, Inc. Orthogonal cross-connecting of printed circuit boards without a midplane board
DE102013218441A1 (en) * 2013-09-13 2015-04-02 Würth Elektronik Ics Gmbh & Co. Kg Direct plug-in device with Vorjustiereinrichtung and relative to this sliding locking device
JP2018516442A (en) * 2015-06-03 2018-06-21 スリーエム イノベイティブ プロパティズ カンパニー Low profile electrical connector
JP7047431B2 (en) * 2018-02-08 2022-04-05 富士通株式会社 Electronic components and boards

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Publication number Publication date
US20210265752A1 (en) 2021-08-26
WO2020053437A1 (en) 2020-03-19
FR3086110B1 (en) 2021-05-28
US11355873B2 (en) 2022-06-07
EP3850710A1 (en) 2021-07-21
FR3086110A1 (en) 2020-03-20
CN112640220A (en) 2021-04-09

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