EP3007198B1 - Stellglied - Google Patents

Stellglied Download PDF

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Publication number
EP3007198B1
EP3007198B1 EP15189060.5A EP15189060A EP3007198B1 EP 3007198 B1 EP3007198 B1 EP 3007198B1 EP 15189060 A EP15189060 A EP 15189060A EP 3007198 B1 EP3007198 B1 EP 3007198B1
Authority
EP
European Patent Office
Prior art keywords
actuator
metal part
contact
enclosure
metal
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.)
Active
Application number
EP15189060.5A
Other languages
English (en)
French (fr)
Other versions
EP3007198A1 (de
Inventor
Eric Bonnet
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.)
Banks and Acquirers International Holding SAS
Original Assignee
Banks and Acquirers International Holding SAS
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 Banks and Acquirers International Holding SAS filed Critical Banks and Acquirers International Holding SAS
Publication of EP3007198A1 publication Critical patent/EP3007198A1/de
Application granted granted Critical
Publication of EP3007198B1 publication Critical patent/EP3007198B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • 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
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5805—Connections to printed circuits
    • 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
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H01H13/063—Casings hermetically closed by a diaphragm through which passes an actuating member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/024—Material precious
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2205/00—Movable contacts
    • H01H2205/002—Movable contacts fixed to operating part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/034—Separate snap action
    • H01H2215/036—Metallic disc

Definitions

  • the proposed technique relates to an actuator.
  • the technique relates more particularly to an actuator for electrical contact.
  • Such actuators are used in electronic devices to establish or break an electrical contact at a printed circuit board at a location where the printed circuit track is deliberately interrupted to precisely detect this electrical contact.
  • Such actuators are for example used to generate electrical contacts on a card when keys on a keyboard are pressed or to detect a break in a previously established electrical contact.
  • Actuators are very practical and used in a wide variety of electronic devices. Actuators are mainly of two types: the switch and the puck. These terms are immediately recognized by those skilled in the art and do not have French translations which represent their functions in electronics.
  • the switch is a component to be soldered or glued to a printed circuit board at the location where electrical contact must be established.
  • the switch has the disadvantage of requiring soldering or bonding, which is not necessarily always possible or desirable.
  • a puck generally comes in the form of a pebble.
  • the base of the roller can be round or in the shape of a metal indentation on which it is supposed to make contact.
  • the puck includes, at one of its ends, a conductive surface.
  • This conductive surface is generally made using a conductive ink or any other relatively inexpensive conductive material. Indeed, with a view to reducing costs, pucks are not essential elements of the electronic device, inexpensive materials are used.
  • the puck is also actuated by a rod (located opposite the conductive part).
  • the rod must be firm enough to provide pressure on the electrical contact.
  • the upper when elastic, can more easily accept dimensional variations.
  • This rod, elastic or not, is often directly integrated into another element which is located on the surface of an electronic device and which is accessible by the user. The puck can then be operated via this rod.
  • the puck can also be directly integrated into the keyboard keys: for example, the silicone keyboards of calculators, remote controls, certain payment terminals, etc.
  • the puck does not necessarily age very well: repeated action on a keyboard key can over time damage the conductive surface of the puck and render the key inoperable.
  • the puck does not guarantee quality electrical contact when the conductivity material used is inexpensive. This is why we frequently encounter large pucks with equally large metal footprints.
  • the puck is not necessarily “coupled” with another element. Therefore, during assembly, difficulties may arise to ensure a correct position of a puck which is, so to speak, floating: there may be problems as to the final position of the puck.
  • the deformable material of the puck is used as a return means (as a spring) to ensure that the puck returns to its initial position after being stressed: this contributes to the rapid deterioration of the puck.
  • the proposed technique does not have these drawbacks of the prior art. More particularly, the proposed technique relates to an actuator (A) for creating an electrical contact between two tracks of a printed circuit board.
  • the metal part (PM) has the shape of a spherical cap.
  • this spherical cap when it receives pressure, this spherical cap is able to deform at its center to allow contact to be established with the tracks of the circuit. printed and when the pressure stops, returns to its initial shape. This spherical cap shape contributes to the longevity of the actuator.
  • the polymer part is made of silicone with a hardness of 60 shores A.
  • the actuator withstands a significant number of requests and offers significant resistance to sabotage attempts, for example when it comes to “hacking” a terminal comprising sensitive data, such as a payment terminal.
  • the actuator is used to make a normally closed contact throughout the duration of use of the terminal, except in the case of disassembly (where the electrical circuit is open) for example by a user who tries to open the terminal fraudulently to place a spy device there.
  • the metal part (PM) is composed of a gold-plated spring steel sheet.
  • the end (E1) of the actuator supporting the metal part (PM) is surrounded by an enclosure (EP) extending to a contact base (BPM) of the metal part (BPM).
  • a protective barrier is formed around the metal part, particularly against dust.
  • the enclosure (EP) generally has the shape of a cone whose apex is a point on the line passing through the central axis of the polymer part (PSM).
  • the general principle of the technique is presented in relation to the figure 1 .
  • the principle of the technique consists of providing the actuator (A) with a metal part (PM). This metal part is used to make contact on a corresponding metal footprint (EMp) of a printed circuit board (CCI).
  • this metallic part (PM) is not of any shape.
  • This metal part has the general shape of a cap, a cap which can be spherical or elliptical or rectangular, as shown in figure 1 .
  • the base (BPM) of this metal part which corresponds to the portion which comes into contact with the corresponding metal footprint of the printed circuit board, is of a shape more or less similar to that of the metal footprint. For example, when the metal imprint forms a circle with a diameter equal to half a centimeter, the base of the metal part of the actuator also forms a circle with a diameter substantially equal to half a centimeter.
  • the function of the metal part is twofold: the metal part is used to provide good electrical conductivity, which makes it possible to differentiate the actuator of the present technique from the traditional puck.
  • the geometry (i.e. the geometric shape) of this metal part is also adapted to reproduce an operation close to that of the switch, namely that the force exerted on the metal part to establish electrical contact on the metal impression is restored at least partially by the metal part itself (and not by a molded silicone part), in order to extend the life of the actuator.
  • the force used to make electrical contact deforms the part metallic: this therefore “seeks” to return to its initial form by restoring the energy initially supplied.
  • the actuator (A) also comprises a polymer part (PSM), possibly molded, for example in the form of a cylinder or a rectangular parallelepiped.
  • This polymer part (PSM) forming an arm comprising a contact end (E1) and a moving end (it is through this end that the pressure is exerted - for example from a key on a keyboard -).
  • the size of this polymer part is adapted, case by case, depending on the situation.
  • This polymer part (PSM) gives the actuator sufficient elasticity to accept position differences due to manufacturing errors of the parts, and deformations that may occur during the life of the product (shocks, falls, aging, variations in temperature).
  • a contact end (E1) of this cylinder is fixed to the metal part (PM) of the actuator (A). This fixing can be carried out by any necessary means such as glue.
  • This end (E1) may have a diameter different from that of the cylinder. More particularly, the diameter of this bonding end can be adapted to the shape of the cap.
  • the end (E1) of the actuator supporting the metal part (PM) is surrounded by an enclosure (EP) which serves as protection during assembly manipulations.
  • This enclosure (EP) is sufficiently flexible not to disrupt the operation of the actuator and more particularly the establishment of electrical contact by the metal part.
  • This enclosure (EP) also makes it possible to create a sealing barrier between the metal part (PM) and the external environment.
  • the enclosure creates a chamber within which the metal part takes place.
  • the base of this enclosure which comes into contact with the printed circuit, can itself be covered with a conductive ink.
  • a known hacking technique for this type of device consists of using a conductive ink to create a short circuit between two rings (for example D2 at A1). The ink maintains contact even when the actuator is removed.
  • the guard ring is then used to detect a short circuit between the EMP ring and itself. If necessary, a terminal protection countermeasure is then triggered. The presence of the guard ring therefore establishes a normally open electrical contact which is used to detect hacking by adding a conductive ink (or any other electrically conductive liquid). A protective countermeasure can then be triggered.
  • the actuator as proposed integrates excellent conductivity (which provides a real advantage for the establishment of electrical contact). This conductivity is ensured by the metal part of the actuator.
  • the proposed actuator is simple to implement and does not require any bonding or welding operation, unlike the switch. In a way, the proposed actuator combines both the advantages of the switch and the puck without having the disadvantages.
  • the actuator in which the metal part takes the form of a spherical cap (CS).
  • CS spherical cap
  • the actuator of the technique described is intended to come into contact with a metal imprint, deposited for example on an electronic card.
  • Such a metallic imprint (E0), described in relation to the figure 2 generally takes a circular shape. More particularly, the metal impression comprises at least one external ring (A1) and an internal disc (D2). Of course, other shapes can also be used depending on requirements.
  • This type of metal imprint is generally used to transmit an electrical signal for activating a key, such as a key located on the surface of a case.
  • This technique is often used for example in electronic control devices such as controllers, joysticks, control keyboards, terminals (payment terminals). For example, for a classic keyboard with twelve keys, twelve such fingerprints are screen-printed or printed on a printed circuit board (or on a motherboard).
  • the key activation signal is initiated by bringing into contact for example the external ring (A1) and an internal disk (D2).
  • a microprocessor or other electronic component arrangement receives an electrical pulse and interprets this pulse based on the functionality implemented in the device in question.
  • a metal impression may include one or two guard rings (AG), internal external or both, as described in Figure 3 .
  • Guard rings are used to prevent fraudulent introductions. The guard rings are then connected for example to the ground of the electronic circuit, so that when a fraudulent introduction of a device is made, an electrical contact is immediately established between the guard ring and another of the rings of the metal imprint. Therefore, security measures for the electronic device in question can be automatically implemented. This type of security measure is generally reserved for terminals comprising sensitive data, such as for example payment terminals or devices controlling access to sensitive data.
  • the actuator of the present technique operates according to the same principle.
  • THE figures 4 And 5 present an embodiment of this actuator.
  • the actuator is represented in three dimensions, in an exploded manner.
  • the actuator (A) comprises a polymer part (PSM), in the form of a cylinder.
  • This one piece of polymer (PSM) comprises an end (E1) called the bonding end.
  • This polymer part (PSM) is a molded silicone part.
  • the diameter of this bonding end is less than the diameter of the cylinder. More specifically, the diameter of this bonding end is substantially equal to the diameter of the internal disk (D2).
  • the metal part (PM) of the actuator (A) is in the form of a spherical cap (CS) whose radius, at the base, is substantially equal to the radius of the external ring (A1), namely four millimeters in this embodiment.
  • the height of the spherical cap (CS) is proportional to the radius and the force to be exerted on the cap to make contact.
  • the spherical cap (SC) is glued to the end (E1) with glue (Gl).
  • the end (E1) of the actuator supporting the metal part (PM) is surrounded by an enclosure (EP) which serves as protection during manipulations during assembly.
  • the enclosure is integrated into the polymer part, thus forming a single part, as presented in Figure 4 .
  • This enclosure generally has the shape of a cone whose apex is a point on the line passing through the central axis of the molded silicone cylinder (apex of the cone shown in dotted lines).
  • the radius of this cone is greater than the radius of the spherical cap (CS), that is to say greater than four millimeters.
  • the base of this cone also ensures the stability of the actuator when it is placed on the printed circuit board.
  • the spherical cap (CS) is pressed in its center. From then on, an electrical contact is established between the external ring (A1) and the internal disc (D2).
  • the polymer part (PSM) is made of silicone with a hardness of 60 shores A, just like the EP enclosure (shown in dotted lines).
  • the metal part (PM) is secured to the contact end (E1) using an adhesive whose tearing force is substantially equal to 100 grams (+/- 20 grams) .
  • the metal part (PM) is made of gold-plated spring steel sheet.
  • the polymer part is in the form of a rectangular parallelepiped instead of a cylinder and that the enclosure (EP) could then have a pyramidal shape.
  • the shape of the metal part is also possible.
  • the spherical cap is advantageous in certain situations, it is also possible that the shape of this cap is modified (hyperbolic cap, etc.).
  • any metal part, deformable or not, can be used according to needs.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Moving Of Heads (AREA)

Claims (6)

  1. Stellglied (A) zur Herstellung eines elektrischen Kontakts zwischen zwei Leiterbahnen einer gedruckten Leiterplatte, aufweisend
    - ein Polymerteil (PSM), das einen Arm bildet, der ein Kontaktende (E1) und ein Bewegungsende aufweist;
    - ein Metallteil (PM), das mit dem Kontaktende (E1) fest verbunden ist und im Wesentlichen die Form einer Kalotte hat,
    - wobei das Ende (E1) des Aktuators, das den Metallteil (PM) trägt, von einer Einfassung (EP) umgeben ist, die sich bis zu einer Kontaktbasis (BPM) des Metallteils (BPM) erstreckt, dadurch gekennzeichnet, dass:
    die Einfassung eine Basis aufweist, die dazu bestimmt ist, die Leiterplatte zu berühren, und mit einer leitfähigen Tinte bedeckt ist.
  2. Stellglied nach Anspruch 1, dadurch gekennzeichnet, dass der Metallteil (PM) die Form einer Kugelkalotte hat.
  3. Stellglied nach Anspruch 1, dadurch gekennzeichnet, dass das Polymerteil (PSM) aus Silikon mit einer Härte von 60 Shore A hergestellt ist.
  4. Stellglied nach Anspruch 1, dadurch gekennzeichnet, dass das Metallteil (PM), das mit dem Kontaktende (E1) fest verbunden ist, mit Hilfe eines Klebstoffs, dessen Abreißkraft im Wesentlichen gleich 100 Gramm ist, befestigt wird.
  5. Stellglied nach Anspruch 1, dadurch gekennzeichnet, dass das Metallteil (PM) aus einem vergoldeten Federstahlblech besteht.
  6. Stellglied nach Anspruch 1, dadurch gekennzeichnet, dass die Einfassung (EP) im Allgemeinen die Form eines Kegels hat, dessen Spitze ein Punkt auf der Geraden ist, die durch die Mittelachse des Polymerteils (PSM) verläuft.
EP15189060.5A 2014-10-10 2015-10-09 Stellglied Active EP3007198B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1459769A FR3027152B1 (fr) 2014-10-10 2014-10-10 Actuateur

Publications (2)

Publication Number Publication Date
EP3007198A1 EP3007198A1 (de) 2016-04-13
EP3007198B1 true EP3007198B1 (de) 2024-05-22

Family

ID=52007147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15189060.5A Active EP3007198B1 (de) 2014-10-10 2015-10-09 Stellglied

Country Status (5)

Country Link
US (1) US9984836B2 (de)
EP (1) EP3007198B1 (de)
BR (1) BR102015025857A2 (de)
CA (1) CA2908288A1 (de)
FR (1) FR3027152B1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990018549U (ko) * 1997-11-12 1999-06-05 전주범 카 오디오용 컨트롤 패널의 쿠션 패드
TW419687B (en) * 1998-12-22 2001-01-21 Shinetsu Polymer Co Push button switch cover and method for manufacturing same
JP2005174788A (ja) * 2003-12-12 2005-06-30 Matsushita Electric Ind Co Ltd プッシュオンスイッチ
IT1398690B1 (it) * 2009-07-07 2013-03-08 Eltek Spa Interruttore per veicoli
DE102010048805A1 (de) * 2009-10-23 2011-04-28 Marquardt Gmbh Schaltelement
US8847092B2 (en) * 2012-07-30 2014-09-30 Blackberry Limited Hybrid keypad apparatus

Also Published As

Publication number Publication date
FR3027152A1 (fr) 2016-04-15
FR3027152B1 (fr) 2018-02-16
EP3007198A1 (de) 2016-04-13
US9984836B2 (en) 2018-05-29
US20160104588A1 (en) 2016-04-14
CA2908288A1 (en) 2016-04-10
BR102015025857A2 (pt) 2016-04-19

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