EP2126944B1 - Pusher-type vault switch and printed circuit including same - Google Patents
Pusher-type vault switch and printed circuit including same Download PDFInfo
- Publication number
- EP2126944B1 EP2126944B1 EP08775709.2A EP08775709A EP2126944B1 EP 2126944 B1 EP2126944 B1 EP 2126944B1 EP 08775709 A EP08775709 A EP 08775709A EP 2126944 B1 EP2126944 B1 EP 2126944B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- domes
- switch
- spacer
- printed circuit
- dome
- 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.)
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- 125000006850 spacer group Chemical group 0.000 claims description 31
- 239000000758 substrate Substances 0.000 claims description 16
- 239000011241 protective layer Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 210000002105 tongue Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/006—Movable contacts mounted on spacer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/012—Movable contacts mounted on both sides of layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/05—Card, e.g. credit card
Definitions
- the present invention relates to a push-button type dome switch for a thin printed circuit board, and a thin printed circuit board.
- a thin printed circuit board can be incorporated into a smart card.
- domes are frequently used as push button switch elements in a keyboard.
- a dome is a cap-shaped element, either continuous or peripherally indented, which exerts a reaction force at a pressure that varies as shown in FIG. figure 6 .
- the curves represent, on the ordinate, the variation of the force applied to the center of a dome as a function of the stroke of this central part of the dome, taken on the abscissa.
- the upper curve corresponds to the increase of the pressure applied to the dome towards its contact position, and the lower curve to the release of this pressure towards the state of rest.
- the upper curve shows that the necessary force rises to a maximum Ft for a stroke Tt, before rapidly decreasing to a smaller value Fr for a stroke Tr, before a slight rise in force until contact full.
- the part of this curve in which the force decreases as the stroke increases between the races Tt and Tr gives a tactile effect felt by the finger that exerts pressure on the dome.
- the first part of the race can be as gradual as desired, by applying a force that increases slowly; however, once the maximum force Ft is reached, the passage to the frank contact occurs very quickly under the action of the elasticity of the dome itself.
- domes in various forms to such smart cards. Given the dimensional constraints of these cards, the domes must have a diameter of about 5 to 8 mm in the plane of the card, and a stroke of a few tenths of a millimeter, less than 0.45 mm. No realization of dome push button type switch has given satisfaction in this application. The reasons are in general, either the absence of discernible tactile reaction, or most often insufficient reliability.
- EP 1 670 012 A discloses a dome switch according to the preamble of claim 1.
- the object of the invention is the production of such push-button type dome switches giving an effective tactile feedback while having a high reliability, that is to say ensuring the obtaining of a certain contact, for a number of maneuvering extremely superior to that which is normally conceivable in the case of such a card.
- this result is obtained by using two substantially identical domes, arranged one against the other by their periphery with the interposition of a spacer.
- the invention relates to a push-button type dome switch for a thin printed circuit board having a thin substrate with at least one face of which is disposed a printed circuit having at least two connection pads to be connected by the switch;
- the switch comprises two domes and an insulating spacer, the peripheral parts of the two domes are each in contact with a face of the spacer and are thus opposite on either side of the spacer, each dome has a connection member intended to be permanently connected to a connection pad of the printed circuit, and the spacer has a central hole large enough that the tops of the two domes can come into mutual contact when subjected to a mutual approaching force.
- the domes have a cap shape having a continuous or substantially continuous circular periphery.
- the connecting member of each dome is preferably a tab which protrudes from the cap, and which for example has a weld passage hole.
- the connecting members of the two domes then have staggered positions along the periphery of the switch.
- the spacer is continuous at the entire periphery, and at least one of the domes has a communication hole on both sides of the dome and / or the spacer is discontinuous at a location at least on its periphery.
- the spacer is continuous at the entire periphery, and the enclosed space between the domes is, in the open position of the switch, at a pressure different from the ambient pressure outside the domes.
- the domes comprise a central portion of which at least three branches extend, the two domes having substantially identical dimensions, the outer ends of the branches of a dome being in contact with the spacer at locations to which they are facing the outer ends of the branches of the other dome.
- the spacer is preferably discontinuous and is present only between the ends of the branches.
- the domes are attached to the spacer by gluing.
- the spacer is entirely formed of glue.
- the invention also relates to a thin printed circuit, of the type which comprises a thin substrate with at least one face of which is disposed a printed circuit having at least two connection pads connected by a push-button type switch.
- the thin substrate has an orifice between the two connection pads
- the pushbutton-type switch is according to one of the preceding paragraphs and is arranged so that the domes' tops are substantially centered on the 'orifice.
- the orifice of the substrate has dimensions at least equal to those of the periphery of the dome, and the connection member of the dome protrudes towards a connection pad.
- the orifice has dimensions at least substantially equal to those of the periphery of the dome, and portions of the thin substrate having the connection pads protrude into the orifice to be connected to the domes.
- the orifice has dimensions smaller than those of the periphery of the dome, so that the thin substrate constitutes the spacer.
- the printed circuit is integrated with a laminated assembly comprising, in addition to the thin substrate, a protective layer placed on at least one of the faces of the thin substrate.
- the printed circuit is integrated with a laminated assembly comprising, on both sides of the thin substrate, protective layers which completely surround the switch and may be flexible or rigid.
- the printed circuit is incorporated in a smart card.
- An advantage of the push-button type switches according to the invention is that they constitute components that can be manipulated and set up by the usual machines for placing electrical and electronic components.
- the push-button switch 10 shown in section on the figure 2 and in exploded form on the figure 3 , comprises two domes 12 having a slight bulge 14 in the center and a continuous circular peripheral portion 16. Each dome 12 has a lug 18 which protrudes from its periphery and preferably has a hole permitting weld housing.
- the Figures 2 and 3 indicate that a circular spacer 32 is disposed between the two domes.
- the push-button switch 10 is disposed on a printed circuit 20, which is thin because of its small thickness (of the order of a tenth of a millimeter) and is relatively flexible.
- This printed circuit 20 has tracks 22, 24 which form connection pads on tongues 26, 28 arranged around a central orifice 30 of circular shape.
- each lug 18 forming a connecting member of a dome 12 is in contact with one of the two tracks of the tracks 22, 24 printed on the tongues 26, 28 of the thin substrate 20.
- the domes are in electrical contact only when pressure is exerted by pinching the domes of the switch to bring the bulges 14 of the domes tops.
- each dome (considered without the lug 18) is for example 8 mm, although domes of 5 or 6 mm in diameter can also be used.
- the metal is preferably steel having a thickness of a few tens of microns.
- the total thickness of the switch that is to say the two domes and the spacer, is of the order of 0.4 to 0.45 mm.
- the stroke between the open position in which the bulges 14 are distant and the closed position obtained by contact of these bulges is of the order of 0.3 mm.
- the push-button type switch represented in the form of a dome 12, is surrounded on each side of the printed circuit 20 by a guard ring 34 arranged around the domes and disengaging them, but covering the connecting portions between the legs or connecting members of the domes and the tracks of the printed circuit 20.
- a protective layer 36 is disposed on each side of the substrate 20, above the spacer 32, so that the switch is fully enclosed as the indicates the figure 5 . As the protective layers are flexible, the switch can be easily controlled by pinching between two fingers.
- a push-button-type switch formed with domes of 8 mm diameter worked several tens of thousands of times. It could be used over a very wide range of temperatures, being controlled by a low activation force, of the order of 2 to 3.5 N. This force is easily applied by clamping between two fingers.
- spacer 32 in the form of a separate element, it may simply consist of an insulating adhesive ring placed between the two domes, with a thickness just sufficient to ensure isolation.
- the space delimited inside the switch, between the domes and the spacer is connected with the space outside the dome, either by a hole (not shown) formed in at least one dome, or by at least one connecting channel formed in the spacer 32, preferably in an inclined direction with respect to a radial direction.
- the domes of the push-button type switch behave in the conventional manner described above with reference to the figure 6 .
- the switch can be made under vacuum, so that its behavior is not that which is indicated on the figure 6 but corresponds to a curve starting above the x-axis.
- the domes do not stick to each other after being in contact, that is to say, so that the vacuum is not sufficient to prevent the separation of the two domes, it is necessary that the force created by this vacuum is sufficiently lower than that which corresponds to the force Fr.
- the advantage of reduction of stroke, and therefore of reduction of thickness of the switch can be obtained only if the force due to the vacuum does not reach the value of the hollow of the curves of the figure 6 for the race Tr.
- the space between the domes contains air or a gas at atmospheric pressure or at a higher pressure, and it is not connected to the outside.
- the compression of the gas placed inside increases the necessary pressure force.
- the shape of the domes must be such that, in the closed position, the space remaining between the two domes is sufficient for the minimum of the curve observed for the race Tr remains lower than the maximum of the curve observed for the race Tt ; otherwise, the tactile effect given by the force reduction during the stroke increase would be lost.
- domes having a circular central portion and branches protruding therefrom i.e. Star domes, having at least three branches.
- the domes must have substantially identical dimensions so that the tabs can be placed on either side of the spacer. This is then preferably discontinuous.
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- Push-Button Switches (AREA)
Description
La présente invention concerne un interrupteur à dômes de type bouton-poussoir pour circuit imprimé mince, et un circuit imprimé mince. Un tel circuit imprimé mince peut être incorporé à une carte à puce.The present invention relates to a push-button type dome switch for a thin printed circuit board, and a thin printed circuit board. Such a thin printed circuit board can be incorporated into a smart card.
On utilise fréquemment des organes de contact appelés "dômes" comme éléments d'interrupteur de type bouton-poussoir dans un clavier. Un dôme est un élément en forme de calotte, soit continue, soit échancrée périphériquement, qui exerce une force de réaction à une pression qui varie comme représenté sur la
Sur la
La partie de cette courbe dans laquelle la force diminue alors que la course augmente entre les courses Tt et Tr, donne un effet tactile que ressent le doigt qui exerce la pression sur le dôme. La première partie de course peut être aussi progressive que voulu, par application d'une force qui augmente lentement ; cependant, une fois que la force maximale Ft est atteinte, le passage au contact franc s'effectue très rapidement sous l'action de l'élasticité du dôme lui-même.The part of this curve in which the force decreases as the stroke increases between the races Tt and Tr gives a tactile effect felt by the finger that exerts pressure on the dome. The first part of the race can be as gradual as desired, by applying a force that increases slowly; however, once the maximum force Ft is reached, the passage to the frank contact occurs very quickly under the action of the elasticity of the dome itself.
On souhaite utiliser de tels dômes dans des interrupteurs de type bouton-poussoir incorporés à des circuits minces. L'avantage de ces interrupteurs de type bouton-poussoir est qu'ils permettent la formation de touches de commande ou de "clavier" incorporées à des organes minces. Ainsi, pour la réalisation de cartes à puce plus ou moins souples et munies d'un clavier et d'un afficheur, il est souhaitable d'utiliser des dômes de contact pour des interrupteurs de type bouton-poussoir.It is desired to use such domes in push-button type switches incorporated in thin circuits. The advantage of these push button type switches is that they allow the formation of control keys or "keyboard" incorporated in thin bodies. Thus, for the realization of smart cards more or less flexible and provided with a keyboard and a display, it is It is desirable to use contact domes for push-button switches.
On a donc essayé d'incorporer des dômes sous diverses formes à de telles cartes à puce. Compte tenu des contraintes dimensionnelles de ces cartes, les dômes doivent avoir un diamètre de 5 à 8 mm environ dans le plan de la carte, et une course de quelques dixièmes de millimètre, inférieure à 0,45 mm. Aucune réalisation d'interrupteur de type bouton-poussoir à dôme n'a donné satisfaction dans cette application. Les raisons en sont en général, soit l'absence de réaction tactile discernable, soit le plus souvent une fiabilité insuffisante. Le document "
L'invention a pour objet la réalisation de tels interrupteurs à dômes de type bouton-poussoir donnant une réaction tactile efficace tout en ayant une fiabilité élevée, c'est-à-dire assurant l'obtention d'un contact certain, pour un nombre de manoeuvres extrêmement supérieur à celui qui est normalement envisageable dans le cas d'une telle carte.The object of the invention is the production of such push-button type dome switches giving an effective tactile feedback while having a high reliability, that is to say ensuring the obtaining of a certain contact, for a number of maneuvering extremely superior to that which is normally conceivable in the case of such a card.
Selon l'invention, ce résultat est obtenu par utilisation de deux dômes sensiblement identiques, disposés l'un contre l'autre par leur périphérie avec interposition d'une entretoise. Bien que cette disposition réduise la course que peut parcourir chaque dôme, on constate de façon surprenante d'une part qu'on obtient un effet tactile très significatif et d'autre part que la fiabilité est élevée, sans doute parce que, grâce au montage en regard des deux dômes, les forces qui leur sont appliquées sont encaissées entièrement par les dômes et ne créent pas de contraintes significatives dans le matériau du circuit imprimé de la carte qui les entoure.According to the invention, this result is obtained by using two substantially identical domes, arranged one against the other by their periphery with the interposition of a spacer. Although this arrangement reduces the travel that each dome can travel, surprisingly, on the one hand, we obtain a very significant tactile effect and on the other hand that the reliability is high, probably because, thanks to the assembly opposite the two domes, the forces applied to them are entirely encased by the domes and do not create significant constraints in the printed circuit board material around them.
Plus précisément, l'invention concerne un interrupteur à dômes de type bouton-poussoir pour circuit imprimé mince possédant un substrat mince à une face au moins duquel est disposé un circuit imprimé ayant au moins deux plages de connexion à connecter par l'interrupteur ; selon l'invention, l'interrupteur comprend deux dômes et une entretoise isolante, les parties périphériques des deux dômes sont chacune au contact d'une face de l'entretoise et sont ainsi en regard de part et d'autre de l'entretoise, chaque dôme possède un organe de connexion destiné à être connecté de manière permanente à une plage de connexion du circuit imprimé, et l'entretoise a un trou central suffisamment grand pour que les sommets des deux dômes puissent venir en contact mutuel lorsqu'ils sont soumis à une force de rapprochement mutuel.More specifically, the invention relates to a push-button type dome switch for a thin printed circuit board having a thin substrate with at least one face of which is disposed a printed circuit having at least two connection pads to be connected by the switch; according to the invention, the switch comprises two domes and an insulating spacer, the peripheral parts of the two domes are each in contact with a face of the spacer and are thus opposite on either side of the spacer, each dome has a connection member intended to be permanently connected to a connection pad of the printed circuit, and the spacer has a central hole large enough that the tops of the two domes can come into mutual contact when subjected to a mutual approaching force.
Dans un mode de réalisation, les dômes ont une forme de calotte ayant une périphérie circulaire continue ou pratiquement continue.In one embodiment, the domes have a cap shape having a continuous or substantially continuous circular periphery.
Dans ce cas, l'organe de connexion de chaque dôme est de préférence une patte qui dépasse de la calotte, et qui a par exemple un trou de passage de soudure. De préférence, les organes de connexion des deux dômes ont alors des positions décalées suivant la périphérie de l'interrupteur.In this case, the connecting member of each dome is preferably a tab which protrudes from the cap, and which for example has a weld passage hole. Preferably, the connecting members of the two domes then have staggered positions along the periphery of the switch.
Dans une variante, l'entretoise est continue à toute la périphérie, et l'un des dômes au moins a un trou de mise en communication des deux côtés du dôme et/ou l'entretoise est discontinue à un emplacement au moins de sa périphérie.In a variant, the spacer is continuous at the entire periphery, and at least one of the domes has a communication hole on both sides of the dome and / or the spacer is discontinuous at a location at least on its periphery. .
Dans une autre variante, l'entretoise est continue à toute la périphérie, et l'espace clos compris entre les dômes est, dans la position d'ouverture de l'interrupteur, à une pression différente de la pression ambiante à l'extérieur des dômes.In another variant, the spacer is continuous at the entire periphery, and the enclosed space between the domes is, in the open position of the switch, at a pressure different from the ambient pressure outside the domes.
Dans un autre mode de réalisation, les dômes comportent une partie centrale dont dépassent au moins trois branches, les deux dômes ayant des dimensions pratiquement identiques, les extrémités extérieures des branches d'un dôme étant au contact de l'entretoise à des emplacements auxquels elles sont en regard des extrémités extérieures des branches de l'autre dôme.In another embodiment, the domes comprise a central portion of which at least three branches extend, the two domes having substantially identical dimensions, the outer ends of the branches of a dome being in contact with the spacer at locations to which they are facing the outer ends of the branches of the other dome.
Dans ce cas, l'entretoise est de préférence discontinue et n'est présente qu'entre les extrémités des branches.In this case, the spacer is preferably discontinuous and is present only between the ends of the branches.
De préférence, les dômes sont fixés à l'entretoise par collage. Par exemple, l'entretoise est entièrement formée de colle.Preferably, the domes are attached to the spacer by gluing. For example, the spacer is entirely formed of glue.
L'invention concerne aussi un circuit imprimé mince, du type qui comprend un substrat mince à une face au moins duquel est disposé un circuit imprimé ayant au moins deux plages de connexion connectées par un interrupteur de type bouton-poussoir. Selon l'invention, le substrat mince a un orifice entre les deux plages de connexion, et l'interrupteur de type bouton-poussoir est selon l'un des paragraphes précédents et est disposé de manière que les sommets des dômes soient pratiquement centrés sur l'orifice.The invention also relates to a thin printed circuit, of the type which comprises a thin substrate with at least one face of which is disposed a printed circuit having at least two connection pads connected by a push-button type switch. According to the invention, the thin substrate has an orifice between the two connection pads, and the pushbutton-type switch is according to one of the preceding paragraphs and is arranged so that the domes' tops are substantially centered on the 'orifice.
Dans un mode de réalisation, l'orifice du substrat a des dimensions au moins égales à celles de la périphérie du dôme, et l'organe de connexion du dôme dépasse vers une plage de connexion.In one embodiment, the orifice of the substrate has dimensions at least equal to those of the periphery of the dome, and the connection member of the dome protrudes towards a connection pad.
Dans un autre mode de réalisation, l'orifice a des dimensions au moins sensiblement égales à celles de la périphérie du dôme, et des parties du substrat mince ayant les plages de connexion dépassent dans l'orifice pour être connectées aux dômes.In another embodiment, the orifice has dimensions at least substantially equal to those of the periphery of the dome, and portions of the thin substrate having the connection pads protrude into the orifice to be connected to the domes.
Dans un autre mode de réalisation, l'orifice a des dimensions inférieures à celles de la périphérie du dôme, de sorte que le substrat mince constitue l'entretoise.In another embodiment, the orifice has dimensions smaller than those of the periphery of the dome, so that the thin substrate constitutes the spacer.
Dans une variante, le circuit imprimé est intégré à un ensemble laminé comprenant, en plus du substrat mince, une couche protectrice placée sur l'une des faces au moins du substrat mince.In a variant, the printed circuit is integrated with a laminated assembly comprising, in addition to the thin substrate, a protective layer placed on at least one of the faces of the thin substrate.
Dans une autre variante, le circuit imprimé est intégré à un ensemble laminé comprenant, aux deux faces du substrat mince, des couches protectrices qui entourent complètement l'interrupteur et peuvent être souples ou rigides.In another variant, the printed circuit is integrated with a laminated assembly comprising, on both sides of the thin substrate, protective layers which completely surround the switch and may be flexible or rigid.
De préférence, le circuit imprimé est incorporé à une carte à puce.Preferably, the printed circuit is incorporated in a smart card.
Un avantage des interrupteurs du type bouton-poussoir selon l'invention est qu'ils constituent des composants qui peuvent être manipulés et mis en place par les machines habituelles de mise en place des composants électriques et électroniques.An advantage of the push-button type switches according to the invention is that they constitute components that can be manipulated and set up by the usual machines for placing electrical and electronic components.
D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre d'un exemple de réalisation, faite en référence aux dessins annexés sur lesquels :
- la
figure 1 est une vue en perspective très agrandie d'une partie de circuit imprimé mince munie d'un interrupteur de type bouton-poussoir selon l'invention ; - la
figure 2 est une coupe diamétrale de l'interrupteur de type bouton-poussoir de lafigure 1 , avec des parties adjacentes du circuit imprimé ; - la
figure 3 est analogue à lafigure 1 mais représente sous forme éclatée les différents éléments de l'interrupteur de type bouton-poussoir ; - la
figure 4 est une vue en perspective d'une partie de carte à puce comprenant l'interrupteur de type bouton-poussoir desfigures 1 à 3 ; - la
figure 5 est une coupe de la partie de circuit imprimé d'une carte à puce représentée sur lafigure 4 ; et - la
figure 6 , déjà décrite, est un graphique indiquant la variation de la force appliquée à un dôme classique, en fonction de la course. - La
figure 1 est une vue en perspective d'un interrupteur de type bouton-poussoir selon l'invention, incorporé à un circuit imprimé mince, par exemple d'une carte à puce plus ou moins souple.
- the
figure 1 is a greatly enlarged perspective view of a thin printed circuit portion provided with a push-button type switch according to the invention; - the
figure 2 is a diametrical cut of the push-button type switch of thefigure 1 , with adjacent parts of the printed circuit; - the
figure 3 is analogous to thefigure 1 but represents in exploded form the various elements of the push-button type switch; - the
figure 4 is a perspective view of a chip card portion including the push-button type switch ofFigures 1 to 3 ; - the
figure 5 is a section of the printed circuit of a chip card shown on thefigure 4 ; and - the
figure 6 , already described, is a graph indicating the variation of the force applied to a conventional dome, as a function of the stroke. - The
figure 1 is a perspective view of a pushbutton-type switch according to the invention, incorporated in a thin printed circuit, for example a more or less flexible smart card.
L'interrupteur 10 de type bouton-poussoir, représenté en coupe sur la
Les
L'interrupteur 10 de type bouton-poussoir est disposé sur un circuit imprimé 20, qui est mince du fait de sa faible épaisseur (de l'ordre du dixième de millimètre) et est relativement souple. Ce circuit imprimé 20 a des pistes 22, 24 qui forment des plages de connexion sur des languettes 26, 28 disposées autour d'un orifice central 30 de forme circulaire.The push-
Dans ce mode de réalisation, et comme l'indique la coupe de la
Comme l'entretoise 32 est isolante, les dômes ne sont en contact électrique que lorsqu'une pression est exercée par pincement des dômes de l'interrupteur pour rapprocher les bombements 14 des sommets des dômes.As the
Dans ce mode de réalisation, le diamètre de chaque dôme (considéré sans la patte 18) est par exemple de 8 mm, bien que des dômes de 5 ou 6 mm de diamètre puissent aussi être utilisés. Le métal est de préférence d'acier ayant une épaisseur de quelques dizaines de microns. L'épaisseur totale de l'interrupteur, c'est-à-dire des deux dômes et de l'entretoise, est de l'ordre de 0,4 à 0,45 mm. La course entre la position d'ouverture dans laquelle les bombements 14 sont distants et la position de fermeture obtenue par contact de ces bombements est de l'ordre de 0,3 mm.In this embodiment, the diameter of each dome (considered without the lug 18) is for example 8 mm, although domes of 5 or 6 mm in diameter can also be used. The metal is preferably steel having a thickness of a few tens of microns. The total thickness of the switch, that is to say the two domes and the spacer, is of the order of 0.4 to 0.45 mm. The stroke between the open position in which the
On considère maintenant, en référence aux
Dans l'exemple de réalisation représenté sur les
Bien qu'on ait représenté sur la
Dans le mode de réalisation des
Dans des variantes, il est possible de réaliser un interrupteur de type bouton-poussoir qui n'a pas de communication entre l'espace intérieur et l'espace extérieur. Par exemple, l'interrupteur peut être réalisé sous vide, de sorte que son comportement n'est pas celui qui est indiqué sur la
Dans une autre variante, l'espace compris entre les dômes contient de l'air ou un gaz à la pression atmosphérique ou à une pression supérieure, et il n'est pas relié à l'extérieur. Ainsi, lors de la fermeture de l'interrupteur, la compression du gaz placé à l'intérieur augmente la force de pression nécessaire. Cependant, la forme des dômes doit être telle que, en position de fermeture, l'espace restant entre les deux dômes soit suffisant pour que le minimum de la courbe observé pour la course Tr reste inférieur au maximum de la courbe observé pour la course Tt ; dans le cas contraire, l'effet tactile donné par la réduction de force lors de l'augmentation de course serait perdu.In another variant, the space between the domes contains air or a gas at atmospheric pressure or at a higher pressure, and it is not connected to the outside. Thus, when closing the switch, the compression of the gas placed inside increases the necessary pressure force. However, the shape of the domes must be such that, in the closed position, the space remaining between the two domes is sufficient for the minimum of the curve observed for the race Tr remains lower than the maximum of the curve observed for the race Tt ; otherwise, the tactile effect given by the force reduction during the stroke increase would be lost.
Bien qu'on ait décrit un interrupteur de type bouton-poussoir comprenant deux dômes en forme de calotte, il est aussi possible d'utiliser des dômes ayant une partie centrale circulaire et des branches qui en dépassent, c'est-à-dire des dômes en étoile, ayant au moins trois branches. Dans ce cas, les dômes doivent avoir des dimensions pratiquement identiques afin que les pattes puissent être mises en regard de part et d'autre de l'entretoise. Celle-ci est alors de préférence discontinue.Although there has been described a pushbutton-type switch comprising two cap-like domes, it is also possible to use domes having a circular central portion and branches protruding therefrom, i.e. Star domes, having at least three branches. In this case, the domes must have substantially identical dimensions so that the tabs can be placed on either side of the spacer. This is then preferably discontinuous.
Bien qu'on ait décrit l'application de l'invention à une carte à puce, elle convient à d'autres applications telles que des nappes souples de connexion, par exemple du type appelé "limandes", lorsqu'elles doivent intégrer une fonction d'interrupteur de type bouton-poussoir.Although the application of the invention has been described to a smart card, it is suitable for other applications such as flexible connection plies, for example of the type called "flanges", when they have to integrate a function. push button type switch.
Claims (11)
- Multi-domed switch of the push-button type for a thin printed circuit possessing a thin substrate (20) against at least one face of which a printed circuit having at least two connection pads to be connected by the switch (10) is placed, characterized in that:- it comprises two domes (12) and an insulating spacer (32),- the peripheral parts of the two domes (12) are each in contact with one face of the spacer (32) and are thus facing one another on either side of the spacer (32),- each dome (12) possesses a connection member (18) intended to be permanently connected to a connection pad of the printed circuit (20), and- the spacer (32) has a central hole large enough for the tops of the two domes (12) to be able to come into mutual contact when they are subjected to a closing-up force.
- Switch according to Claim 1, characterized in that the domes (12) take the form of a spherical cap having a continuous or practically continuous circular periphery (16).
- Switch according to Claim 2, characterized in that the connection member (18) of each dome is a lug that extends beyond the spherical cap.
- Switch according to either of Claims 2 and 3, characterized in that the spacer (32) is continuous all around the periphery, and at least one of the domes (12) has a hole for bringing the two sides of the dome into communication.
- Switch according to either of Claims 2 and 3, characterized in that the spacer (32) includes a connecting channel for bringing the space bounded on the inside of said switch, between the domes (12) and the spacer (32), into communication with the space outside the domes (12).
- Switch according to either of Claims 2 and 3, characterized in that the spacer (32) is continuous all around the periphery, and the closed space lying between the domes (12) is, in the open position of the switch, at a different pressure from the ambient pressure outside the domes.
- Switch according to Claim 1, characterized in that the domes have a central part from which at least three branches extend, the two domes having practically identical dimensions, the external ends of the branches of one dome being in contact with the spacer in positions in which they are facing the external ends of the branches of the other dome.
- Switch according to any one of the preceding claims, characterized in that the domes (12) are fixed to the spacer (32) by adhesive bonding.
- Thin printed circuit, of the type which comprises a thin substrate (20) against at least one face of which a printed circuit having at least two connection pads connected by a switch of the push-button type is placed, characterized in that:- the thin substrate (20) has an orifice (30) between the two connection pads; and- the push-button switch (10) is according to any one of the preceding claims and is placed so that the tops of the domes (12) are practically centred on the orifice (30).
- Printed circuit according to Claim 9, characterized in that the orifice (30) of the substrate has dimensions at least equal to those of the periphery of the dome, and the connection member (18) of the dome extends towards a connection pad.
- Printed circuit according to either of Claims 9 and 10, characterized in that the printed circuit (20) is integrated into a laminated assembly comprising, at the two faces of the thin substrate (20), protective layers (36) which completely surround the switch (10).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0701848A FR2913809B1 (en) | 2007-03-14 | 2007-03-14 | PUSH BUTTON TYPE SWITCH, AND PRINTED CIRCUIT INCLUDING THE SAME |
PCT/FR2008/050408 WO2008129193A2 (en) | 2007-03-14 | 2008-03-11 | Pusher-type vault switch and printed circuit including same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2126944A2 EP2126944A2 (en) | 2009-12-02 |
EP2126944B1 true EP2126944B1 (en) | 2014-06-11 |
Family
ID=38317692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08775709.2A Active EP2126944B1 (en) | 2007-03-14 | 2008-03-11 | Pusher-type vault switch and printed circuit including same |
Country Status (5)
Country | Link |
---|---|
US (1) | US8278580B2 (en) |
EP (1) | EP2126944B1 (en) |
FR (1) | FR2913809B1 (en) |
TW (1) | TW200906241A (en) |
WO (1) | WO2008129193A2 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8136736B2 (en) * | 2008-12-09 | 2012-03-20 | Vasco Data Security, Inc. | Slim electronic device with detector for unintentional activation |
US8191789B2 (en) | 2008-12-09 | 2012-06-05 | Vasco Data Security, Inc. | Flex token with embossed key protection |
US8314354B2 (en) * | 2009-07-27 | 2012-11-20 | Apple Inc. | Accessory controller for electronic devices |
FR2950193A1 (en) * | 2009-09-15 | 2011-03-18 | Nicomatic Sa | TOUCH-EFFECT SWITCH |
US20130071683A1 (en) * | 2011-09-21 | 2013-03-21 | Apple Inc. | Systems and methods for electroforming domes for use in dome switches |
US8777115B2 (en) | 2012-07-13 | 2014-07-15 | Syscard Innovations Inc. | Card switch |
US9031276B2 (en) | 2012-12-07 | 2015-05-12 | Apple Inc. | Electroformed housings for electronic devices |
US9711303B2 (en) | 2013-06-27 | 2017-07-18 | Blackberry Limited | Dome-shaped assembly and handheld electronic device including dome-shaped assembly |
US20180294112A1 (en) * | 2017-04-11 | 2018-10-11 | Shenzhen Excelsecu Data Technology Co., Ltd. | Dome switch and smart card |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2181489C (en) * | 1995-08-14 | 2001-06-12 | Richard Owen Glasson | Method and apparatus for switching mechanism |
US5898147A (en) * | 1997-10-29 | 1999-04-27 | C & K Components, Inc. | Dual tact switch assembly |
JP2002245895A (en) * | 2001-02-14 | 2002-08-30 | Yazaki Corp | Dome switch |
US6858811B2 (en) * | 2001-06-07 | 2005-02-22 | Bed-Check Corporation | Binary switch apparatus and method for manufacturing same |
US6797906B2 (en) * | 2002-03-15 | 2004-09-28 | Brother Kogyo Kabushiki Kaisha | Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard |
WO2005045867A1 (en) * | 2003-11-06 | 2005-05-19 | Philip Adrian Sjostrom | Switch element |
JP4371987B2 (en) * | 2004-12-07 | 2009-11-25 | ホシデン株式会社 | Push-on switch |
-
2007
- 2007-03-14 FR FR0701848A patent/FR2913809B1/en active Active
-
2008
- 2008-03-11 US US12/531,175 patent/US8278580B2/en not_active Expired - Fee Related
- 2008-03-11 WO PCT/FR2008/050408 patent/WO2008129193A2/en active Application Filing
- 2008-03-11 EP EP08775709.2A patent/EP2126944B1/en active Active
- 2008-03-13 TW TW097108855A patent/TW200906241A/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2008129193A2 (en) | 2008-10-30 |
TW200906241A (en) | 2009-02-01 |
FR2913809B1 (en) | 2009-06-05 |
US20100140072A1 (en) | 2010-06-10 |
EP2126944A2 (en) | 2009-12-02 |
US8278580B2 (en) | 2012-10-02 |
WO2008129193A3 (en) | 2008-12-18 |
FR2913809A1 (en) | 2008-09-19 |
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