electronic terminal and security system

Abstract

The invention relates to an electronic terminal (10) comprising: A peripheral (20); An electronic card (30) extending in a given plane and comprising a front face of the electronic card (31) and a rear face of the electronic card (32); two card-to-card connectors (21, 22) for the electrical connection of said electronic card (30) to said peripheral (20), of which a first connector (21) is mounted directly on said front face (31) of the electronic card (30) and a second connector (22) is connected to said display device (20), said first connector (21) and second connector (22) being disconnectable by a translation along a direction substantially orthogonal to said plane of the electronic card (30);a safety system (40) configured to detect an attempt to disconnect said first connector (21) and second connector (22), the safety system (40) comprising a part (41) clamping the second connector (22) and said rear face of the electronic board (32) so as to maintain contact between the first connector (21) and second connector (22); and a detector (42) for the presence of said part (41). Figure 1;

Description

Title of the invention: Electronic terminal and security system technical field

[0001] The invention, which belongs to the field of electronic terminals, relates in particular to a particular architecture of electronic terminal enabling the detection and prevention of a potentially fraudulent disconnection of at least some of the constituent elements of such a terminal. Introduction

[0002] Generally, an electronic terminal, of the communication terminal or payment terminal type, consists of a number of electronic devices assembled together, at least some of which are fully enclosed in a protective case comprising a front cover and a rear cover capable of cooperating with each other so as to allow secure closure of the protective case.

[0003] These various electronic devices, some of which are at least electrically connected to each other, include in particular a possible touch device capable of receiving touch inputs, a display device, and an electronic board on which are arranged at least some of the electronic components necessary for the operation of the electronic terminal.

[0004] Certain types of electronic terminals, intended to collect or transmit confidential data, are required to operate in restricted environments and to offer functionalities of a sensitive nature.

[0005] Thus, such terminals must exhibit a high degree of operational security and high reliability, and in particular include additional electronic elements designed to ensure their proper functioning and to prevent any fraud or intrusion.

[0006] For example, it must not be possible to easily access the signals of the display device, in order to be sure to control its output, and to prevent the display of false messages that could deceive the user.

[0007] Therefore, it is necessary to be able to detect the disconnection of the display device immediately.

[0008] It should be noted that the display device is traditionally electrically connected to the electronic board via a board-to-board (BTB) connection. Indeed, the display device comprises its own electronic board (and the connection is between the two electronic boards).

[0009] We thus have two card-to-card connectors respectively connected to the electronic card of the terminal and to the display device (generally male and female plugged in), physically disconnectable, so that the display device can be changed if needed (for example in case of failure), and it is this disconnection that we are trying to detect.

[0010] It is known to those skilled in the art to detect disconnection of board-to-board connectors by looping a signal through the contacts between the two connectors. If the signal is detected as interrupted (disconnection), the active safety mechanism is triggered.

[0011] The principle of looping a signal through the connectors implies controlling the routing of the traces of the two connected elements. This does not pose a problem on the electronic board side since it is designed specifically for the terminal, but for cost reasons, standard display devices (i.e., commercially available, so-called "off-the-shelf") are used, which do not have this functionality.

[0012] It is therefore necessary to use other display devices, which can be modified to allow the safety loop.

[0013] It would therefore be desirable to have a security solution that can detect the disconnection of board-to-board connectors for any component of a terminal, including standard non-modifiable components, and that remains simple, effective and reliable.

[0014] The invention improves the situation. Summary of the invention

[0015] The present invention therefore relates to an electronic terminal comprising: - - A peripheral device; - An electronic card extending in a given plane and comprising a front face of electronic board and a rear face of electronic board; - - two board-to-board connectors for the electrical connection of said electronic card said peripheral, of which a first connector mounted directly on said front face of the electronic card and a second connector connected to said display device, said first connector and second connectors being disconnectable by a translation along a direction substantially orthogonal to said plane of the electronic card; - a security system configured to detect an attempt to disconnection of said first connector and second connector, the safety system comprising a part clamping the second connector and said rear face of the electronic board so as to keep the first connector and second connector in contact; and at least one presence detector of said part.

[0016] According to advantageous and non-limiting characteristics:

[0017] Said device is a display device.

[0018] The first card-to-card connector is a female part and the second card-to-card connector is a male part.

[0019] Said part of the security system keeps the male part of the card-to-card connector pressed into said female part of the card-to-card connector.

[0020] The first board-to-board connector is soldered to the electronic board.

[0021] The detector is covered by said part.

[0022] The detector is a button held in place by the part.

[0023] The part of the security system is an elastic part applying a compressive force along said direction substantially orthogonal to said plane of the electronic board.

[0024] The part is made of metal and connected to ground.

[0025] The first board-to-board connector is located near an edge of the electronic board

[0026] The part has a C-shaped form around said edge of the electronic board.

[0027] Which said part is a bent metal sheet.

[0028] An internal surface of said part is at least partially covered by a flexible printed circuit.

[0029] Said presence detector of said part is disposed on said rear face of the electronic board.

[0030] Said part comprises successively a first wing, a side and a second wing.

[0031] Said presence detector of said part is disposed on said rear face opposite the first connector.

[0032] Said presence detector of said part is disposed on said front face of the electronic board.

[0033] The first wing covers the second board-to-board connector, the side extends over said edge of the electronic board.

[0034] The second wing covers the detector, or the first wing also covers the detector.

[0035] The first or second wing has a protrusion adapted to press said button.

[0036] Said first wing has a lateral panel on at least one side adjacent to the flank, said lateral panel extending along at least the second card-to-card connector, and preferably along the first card-to-card connector.

[0037] The side has a slot into which a lateral end of the second card-to-card connector is inserted.

[0038] The electronic board is configured to trigger an alert if the detector detects an absence from the room. Brief description of the figures

[0039] The invention will be better understood upon reading the detailed description, which is given below in relation to the figures, among which:

[0040] [Fig.1] represents an example of an electronic terminal according to the invention.

[0041] [Fig.2] represents an example of an embodiment of a presence detection device of an electronic terminal security system conforming to the invention.

[0042] [Fig.3] represents an example of an embodiment of a part of the electronic terminal security system according to the invention.

[0043] [Fig.4a] is a top view of a first embodiment of the electronic terminal security system according to the invention.

[0044] [Fig.4b] is a bottom view of the first embodiment of the electronic terminal security system according to the invention.

[0045] [Fig.5a] is a top view of a second embodiment of the electronic terminal security system according to the invention.

[0046] [Fig.5b] is a side view of the second embodiment of the electronic terminal security system according to the invention. Detailed description

[0047] General architecture

[0048] With reference to [Fig.1], the electronic terminal 10 is advantageously of the electronic terminal type.

[0049] It comprises at least one electronic card 30 extending in a given plane and comprising a front face of electronic card 31 and a rear face of electronic card 32, and a peripheral 20. The electronic card 30 is generally rectangular and has edges.

[0050] The electronic board 30, or PCB (for Printed Circuit Board), is a rigid board that includes a plurality of electronic components necessary for the operation of the electronic terminal, some of which are connected by a plurality of conductive traces arranged on the electronic board. In particular, the electronic board 30 includes the central processing unit of the electronic terminal 10.

[0051] The terminal 10 typically includes a protective housing 40 in which the electronic card 30 is suitable for being disposed.

[0052] By peripheral 20, we mean a functional unit distinct from the electronic board 30 but comprising its own electronic board. More precisely, the Electronic card 30 is the main electronic card of terminal 10, and the peripheral card 20 is a secondary card, hence the name "peripheral".

[0053] The device 20 is preferably a display device, possibly a touchscreen, but it could alternatively be a card reader, a biometric sensor, etc. Preferably, the device 20 is a standard, non-modifiable device. There may be several devices 20.

[0054] The terminal 10 further includes in a known manner two card-to-card connectors 21, 22 for the electrical connection of said electronic card 30 to said peripheral 20.

[0055] More specifically, there is a first connector 21 mounted directly on the front face 31 of the electronic board 30, and a second connector 22 connected to the display device 20. As such, the first connector is generally soldered directly onto the electronic board 30, while the second connector 22 is generally at the end of a flat cable coming from the peripheral 20. It should be noted that the peripheral 20 is most often supplied directly with the cable and the second connector 22, the assembly not being detachable (one end of the cable is soldered to the electronic board of the peripheral, and the other end is soldered to the second connector), so that the only possible disconnection is between the first and second connectors 21, 22.

[0056] The two connectors 21, 22 will naturally be complementary, but any type of connector 21, 22 can be used, including the "pin header" type. Generally, there is a female connector and a male connector, the female connector typically being the first connector 21 and the male connector typically being the second connector 22. In this latter case, the first connector 21 mounted on the electronic board 30 forms a base for the second connector 22. They can be reversed (male connector on the board 30), or even two hermaphroditic connectors can be used.

[0057] In the context of the present invention, said first connector 21 and second connector 22 are disconnectable by translation along a direction substantially orthogonal to said plane of the electronic board 30 (the plane in which the board 30 extends), referred to as the disconnection direction. In other words, it is not intended that said first connector 21 and second connector 22 be disconnectable by translation within said plane of the electronic board 30.

[0058] Conversely, when disconnected, said first connector 21 and second connector 22 are connectable by a translation along a direction substantially orthogonal to said plane of the electronic card 30, by pushing the male connector into the female connector.

[0059] In practice, this is achieved by properly arranging the first connector 21 on the electronic board, in particular by orienting the cavities / pins in said direction.

[0060] Preferably, the device 20 is then connected to the second connector 22 by a flat cable extending perpendicularly to said disconnection direction, i.e. in the plane of the card 30, over its front face 30.

[0061] In all cases, the first connector 21 is advantageously of the "board edge" type, that is to say, it is located near an edge of said electronic board 30. Indeed, space is generally limited on the board, and a board edge connector allows for optimization of the footprint. More precisely, the first connector 21 generally has a long edge and a short edge (it has a parallelepiped shape), and it is understood here that one of these two edges of the first connector 21 is preferably substantially parallel to one of the edges of the board 30, at a distance less than the length of said short edge (and most often directly against the edge of the board 30).

[0062] The possible flat cable connecting the second connector 22 to the peripheral 20 then extends, if it is in the plane of the card 30, orthogonally to said long edge and therefore substantially parallel to the short edge.

[0063] The choice of edge-of-board connectors may seem paradoxical because they are considered more vulnerable due to the risk of accessing the signal from the side, by laterally penetrating connector 21 and / or 22. We will see that, on the contrary, it is perfectly suited to the present invention.

[0064] Intuitively, the long edge of the first connector 21 can be along the edge of the card 30, but alternatively, according to the preferred embodiment of [Fig. 1], it is the short edge of the first connector 21 that is along the edge of the card 30. This means, as can be seen in the figures, that the flat cable from the second connector 22 extends substantially along said edge of the card 30 on the front face 31.

[0065] Such an arrangement is in fact not only optimal from the point of view of the size of the card 30, but also proves, as we shall see, optimal from the point of view of safety: it significantly reduces the risks related to the edge of the card because one or two pins of the connector 21 at most are accessible laterally, and proves to be even more suitable.

[0066] Security system

[0067] The electronic terminal 10 further includes a security system configured to detect disconnection of said first connector 21 and second connector 22, which, as explained, could mean that an attacker wishes to fraudulently access the device 20. It should be noted that the disconnection may be legitimate. (for example to repair terminal 10), but the idea is that it cannot be disconnected without this being detected.

[0068] The security system 40 comprises for this purpose:

[0069] - a part 41 enclosing the second connector 22 and said rear face 32 of the electronic card 30 so as to keep the first connector 21 and second connector 22 in contact. To rephrase, the part sandwiches the card 30 (by resting on the back face 32) and the second connector 22 (by resting on its top), with the first connector 21 in the middle.

[0070] - a detector 42 for the presence of said part 41.

[0071] Several embodiments of part 41 will be seen later, but it is understood that as long as it is there, the aforementioned translation of the second connector 22, and therefore disconnection, is impossible. There may be a little play, but contact is maintained because the first and second connectors 21, 22 would have to be separated to achieve disconnection.

[0072] Part 41 is naturally removable, if one legitimately wishes to disconnect connectors 21 and 22, but if it is moved the detector 42 detects its absence.

[0073] It is then sufficient to configure the electronic card 30 to trigger an alert if the part 41 is detected as absent by the detector 42 (for example, by sending a notification, emitting an audio or visual signal, refusing to implement a transaction, etc.). This achieves the same result as looping a signal through the connectors 21, 22, without needing to modify the device 20.

[0074] We will not be limited to one way of using the security system 40.

[0075] Detector

[0076] As explained, the security system 40 includes at least one presence detector 42. There may be a single detector 42, or two in a preferred mode, or even more.

[0077] With reference to the figures, part 41 preferentially covers detector 42 so as to prevent it from being accessible and potentially disabled or deceived by an attacker.

[0078] Any presence detection technology for part 41 (optical sensor, proximity sensor, electrical contactor, etc.) may be used, but preferably a simple button as shown in [Fig. 2]. This is a simple, reliable, and inexpensive technology. It may, for example, be of the "false touch" type, and in particular a foil equipped with a metal dome that deforms under pressure (called a dome foil) or a conductive comb

[0079] Part 41 and button 42 are therefore in contact, and button 42 is then held pressed by part 41 (as long as it is present).

[0080] Thus, in this case, the part 41 clamps the second connector 22 and said rear face of the electronic board 32 so as to both keep the button 42 pressed and keep the first connector 21 and second connector 22 in contact (in other words, the part 41, when in place has the dual function of keeping the button 41 permanently pressed and preventing the first connector 21 and second connector 22 from separating).

[0081] If the button 42 is released (which means an attempt to remove the part 41), the electronic board 30 triggers the alert.

[0082] According to a first embodiment, corresponding to figures 4a and 4b, the detector 42 is arranged on said rear face 32 of the electronic card 32, and therefore it is itself covered by the part 41 because the latter encloses this rear face 32, and thus it is protected and inaccessible from an attacker.

[0083] In a particularly preferred manner, the detector 42 is arranged opposite the first connector 21. In other words, the positions of the detector 42 and the first connector 21 coincide on the card 30, they are aligned, i.e. if one were to cross the card 30 at the level of the first connector 21 one would come upon the detector 42.

[0084] Thus, in this case, the part 41, which clamps the second connector 22 and the rear face of the electronic board 32, cannot hold the button 42 down without maintaining contact between the first connector 21 and the second connector 22, and vice versa. In other words, it is impossible to have one button pressed without the other. This makes it impossible to move the part in such a way as to release the connector 21 while holding the button 42. To put it another way, this design is particularly sensitive to attempts to move the part 41.

[0085] According to a second embodiment, corresponding to Figures 5a and 5b, the detector 42 is located on the front face 31 of the electronic board 32, near the first connector 22 (it is indeed on the same face as the latter). The detector 42 is therefore also near the second connector 22, and it is thus easy for the part 41 to cover both the second connector 22 and the detector 42, protecting it and rendering it inaccessible to an attacker.

[0086] It is understood that this mode is slightly less secure since the positions of the detector 42 and the first connector 21 cannot coincide on the board 30 (even though there are additional means to prevent any movement of part 41, see below). On the other hand, this mode is particularly well-suited for detecting any attempt, serious or not, to tamper with the part. Indeed, as soon as one attempts to bend part 41, even slightly, the press of button 42 is instantly interrupted. To put it another way, this architecture is particularly sensitive to attempts to deform part 41.

[0087] According to a particularly advantageous mode, two detectors 42 can be had, one on the front face 31 and the other on the rear face 32, so as to guarantee maximum security and be sensitive to any attempt to manipulate the part 41 (displacement and deformation).

[0088] Part

[0089] Any part 41 allowing it to be kept in contact with the first connector 21 and second connector 22 may be used.

[0090] Preferably, the part 41 of the safety system 40 is an elastic part applying a compressive force along said direction substantially orthogonal to said plane of the electronic card 30. In other words, the part "grips" the card 30 and the connectors 21, 22.

[0091] For this purpose, part 41 may include elastic return means (for example, springs – a “clothespin” type part) or be made of elastic material, in particular plastic or metal. In the latter case, it is advantageously connected to ground (for example, via a flexible tab) to enhance safety.

[0092] With reference to [Fig.3], if the connectors are of the board edge type (i.e. the first board-to-board connector 21 is located near an edge of the electronic board 30), the part 41 advantageously has a C-shaped form around said edge of the electronic board 30 (a form which was already found on [Fig.1]).

[0093] By "C-shape" it is meant that the part 41 goes around the card 30 along the edge near which the first connector 21 is located. Thus, it not only prevents disconnection, but it also protects the connectors 21, 22 laterally by forming a barrier preventing access via that edge. The part 41 can be added / removed by sliding it laterally until it touches the edge of the card 30.

[0094] According to a preferred embodiment, in accordance with the figures, and in particular with the aforementioned [Fig.3], the "C" is angular, i.e. the part 41 successively comprises a first wing 411, a side 410 and a second wing 412. In other words, the part 41 comprises two folds substantially at 90°: a first fold between the first wing 411 and the side 410, a second fold between the side 410 and the second wing 412. The part 41 can thus, for example, be a folded sheet metal, as shown in [Fig.3].

[0095] As can be seen in Figures 4a and 4b mentioned above, which respectively represent said part 41 viewed from above and below in the first embodiment above in which the detector 42 is arranged on the rear face 32, the first wing 411 covers the second board-to-board connector 22 (i.e., the first wing 411 is on the side of the front face 31 of the board 30), the side 410 extends over said edge of the electronic board 30, and the second wing 412 covers the detector 42 (i.e., the second wing 412 is on the rear face 32 of the board 30). The wings 411 and 412 thus form the "jaws" of the part 41, hence the clamping and retaining effect. This configuration is optimal, protects all the components, and has a minimal footprint.

[0096] If the detector 42 is a button, as seen in the figures and in particular in [Fig. 3], the second wing 412 (the one against the rear surface 32 of the card 30 and therefore covering this button 42) has a protrusion 413 adapted to press on said button 42, typically a cone. This ensures perfect contact of the button 42 and therefore an absence of false negatives / false positives.

[0097] As can be seen in Figures 5a and 5b mentioned above, which respectively represent said part 41 viewed from above and from the side in the second embodiment above in which the detector 42 is arranged on the front face 31, the first wing 411 (on the side of the front face 31 of the card 30) covers both the second board-to-board connector 22 and the detector 42, the side 410 always extending over said edge of the electronic card 30, and the second wing 412 only resting on the rear face 32 of the card 30. The wings 411 and 412 still form "jaws" of the part 41, but insofar as the second wing 412 does not cover any component (everything is under the first wing 411), it is possible to lighten it and reduce it to a "clip" as seen in the [Fig.5b]. On the other hand, the first wing 411 must be wider to cover both the second connector 22 and the detector 42.Such an asymmetrical architecture of part 41 fits particularly well on the card 30 while being easy for a technician to handle and who must legitimately remove part 41 to disconnect the peripheral 20 as part of maintenance or repair of the terminal 10.

[0098] Note that in this embodiment, the possible protrusion 413 adapted to press said button 42 is on the first wing 411 instead of the second wing 412 (The part 41 is therefore reversed with respect to [Fig.3]).

[0099] In the case where there is a detector 42 on each face 31, 32, we preferentially have a protuberance 413 on each of the wings 411, 412 (one for each detector 42).

[0100] Preferably, an internal surface of said part 41 (i.e., towards the card 30) is covered by a flexible printed circuit board, in particular at least the internal surface of the side 410 (and preferably the entire internal surface of the part). By flexible integrated circuit, or FCP (for Flexible Circuit Board), we mean a flexible board with conductive traces and potentially electronic components. Any drilling in part 41 (and in particular its side 410) damages this circuit and therefore disrupts the electrical signal. It is sufficient to connect it to the electronic card 30 to also trigger an alert if this printed circuit board experiences a disturbance.

[0101] According to yet another preferred embodiment (not shown), said first wing 411 may have a lateral panel on at least one side adjacent to the flank 410, said lateral panel extending along at least the second card-to-card connector 22, and preferably along the first card-to-card connector 21, and even more preferably until it touches the front face 31 of the card 30, so as to completely "enclose" the connectors 21, 22 (and where applicable the detector 42 if we are in the second embodiment in which the detector 42 is arranged on the front face 31). This panel or these panels may be obtained by additional folds of the part 41.

[0102] Indeed, as explained, the edge side is protected by the flank 410, and the flap(s) in question are intended to protect the other sides, although an attack from this angle would be much more complex (it would require opening the terminal 10, and there are already multiple security systems in place to prevent this). In [Fig. 4a], a lateral flap is most preferably located on the side of the first wing 411 of the part 410, to the right of the flank 410, i.e., "downstream" of the second connector 22, since the cable of the peripheral 20 is upstream of the connector 22.

[0103] Note that the first wing 411 can also have a lateral panel on the opposite side to the flank 410, although an attack from this side would be even more complicated (since it would have to come from the center of the card 30) and it would then be necessary to slightly spread the wings 411, 412 apart to add / remove part 41, which would be immediately detected in the case of the second embodiment.

[0104] In an embodiment (not shown) with connectors 21, 22 edge of card but with the long edge of the first connector 21 which would be along the edge of the card 30 (i.e. with the cable of the peripheral 20 which would go towards the center of the card 30), there are preferably two lateral faces on the two sides adjacent to the flank 410 (i.e. the short edges of the connectors 21, 22).

[0105] In all cases, the side panels, as explained, prevent access to the signals from the sides and also allow for good centering of part 41, which ensures that it is properly engaged with detector 42. Indeed, it should be recalled that part 41 is designed to be added / removed by sliding it laterally until it touches the edge of card 30, and the panels then act as guides.

[0106] According to yet another preferred embodiment (shown in Figures 5a and 5b, but also applicable to the first embodiment in which the detector 42 is arranged on the rear face 32), where the short edge of the first connector 21 is along the edge of the card 30, the side 410 may have a slot into which a lateral end of the second connector 22 fits, and in particular an end lateral to a stiffener of said second connector 22. It may seem paradoxical to expose the second connector 22 in this way, but it actually proves to be low-risk and very advantageous: - In this way, the connector 22 itself prevents any lateral movement of the part 41. This is therefore particularly useful in the second embodiment (in which the detector 42 is located on the rear face 32), which, it should be noted, is particularly sensitive to any attempt to deform the part 41, but in which it may still be possible to move the part 41. With this slot, the same level of security is obtained as with two detectors 42. - A board edge connector will never protrude from the first side, and therefore the end of the second connector 22 only inserts a few millimeters into the slot, which is insufficient to allow access. - The slot does not need to allow the insertion of the lateral end of the first connector 21, the second connector 22 being generally wider than the first connector 21, and thus preferably it is a slot which only allows the insertion of the lateral end of the second connector 22 (and not that of the lateral end of the first connector 21). - We are in the case where the short edge of the first connector 21 is along the edge of the card 30, i.e. it would be necessary in any case to drill through the side edges to reach the pins of the first connector 21.

Claims

Demands

1. Electronic terminal (10) comprising: - A peripheral (20); - An electronic card (30) extending in a given plane and comprising a front face of the electronic card (31) and a rear face of the electronic card (32); - two card-to-card connectors (21, 22) for the electrical connection of said electronic card (30) to said peripheral (20), of which a first connector (21) is mounted directly on said front face (31) of the electronic card (30) and a second connector (22) is connected to said display device (20), said first connector (21) and second connector (22) being disconnectable by a translation along a direction substantially orthogonal to said plane of the electronic card (30);- a security system (40) configured to detect an attempt to disconnect said first connector (21) and second connector (22), the security system (40) comprising a part (41) clamping the second connector (22) and said rear face (32) of the electronic board (30) so as to maintain contact between the first connector (21) and second connector (22); and at least one detector (42) of the presence of said part (41).

2. Electronic terminal according to claim 1, wherein said device (20) is a display device

3. Electronic terminal according to any one of claims 1 and 2, wherein the first card-to-card connector (21) is a female part and the second card-to-card connector (22) is a male part, said part (41) of the security system (40) maintaining the male part (22) of the card-to-card connector (21, 22) pressed into said female part (21) of the card-to-card connector (21, 22).

4. Electronic terminal according to any one of claims 1 to 3, wherein the first board-to-board connector (21) is soldered to the electronic board (30).

5. Electronic terminal according to any one of claims 1 to 4, wherein the detector (42) is covered by said part (41).

6. Electronic terminal according to claim 5, wherein the detector (42) is a button held pressed by the part (41).

7. Electronic terminal according to any one of claims 1 to 6, wherein the part (41) of the security system (40) is an elastic part applying a compressive force along said direction substantially orthogonal to said plane of the electronic card (30).

8. Electronic terminal according to claim 7, wherein the part (41) is made of metal and connected to ground.

9. Electronic terminal according to any one of claims 1 to 8, wherein the first board-to-board connector (21) is disposed near an edge of the electronic board (30), the part (41) having a C-shape around said edge of the electronic board (30).

10. Electronic terminal according to claims 8 and 9 in combination, wherein said part (41) is a bent metal sheet.

11. Electronic terminal according to any one of claims 9 and 10, wherein an internal surface of said part (41) is at least partially covered by a flexible printed circuit.

12. Electronic terminal according to any one of claims 1 to 11, wherein said detector (42) of presence of said part (41) is disposed on said rear face (32) of the electronic card (30).

13. Electronic terminal according to claims 5, 9 and 12 in combination, wherein said part (41) successively comprises a first wing (411), a side (410) and a second wing (412), the first wing (411) covering the second board-to-board connector (42), the side (410) extending over said edge of the electronic board (30), and the second wing (412) covering the detector (42).

14. Electronic terminal according to any one of claims 12 and 13, wherein said detector (42) of presence of said part (41) is disposed on said rear face (32) opposite the first connector (31).

15. Electronic terminal according to any one of claims 1 to 14, wherein said detector (42) of presence of said part (41) is disposed on said front face (32) of the electronic card (30).

16. An electronic terminal according to claims 5, 9, and 15 in combination, wherein said part (41) successively comprises a first wing (411), a side (410), and a second wing (412), the first wing (411) covering the second card-to-card connector (22) and the detector (42), the side (410) extending over said edge of the electronic card (30).

17. Electronic terminal according to any one of claims 13 and 16 in combination with claim 6, wherein the first or second wing (411, 412) has a protrusion (413) adapted to press said button (42).

18. Electronic terminal according to any one of claims 13, 14, 16 and 17, wherein said first wing (411) has a side panel on at least one side adjacent to the flank (410), said side panel extending along at least the second card-to-card connector (22), and preferably along the first card-to-card connector (21).

19. Electronic terminal according to any one of claims 13, 14, 16 to 18, wherein the side (410) has a slot into which a lateral end of the second card-to-card connector (22) fits.

20. Electronic terminal according to any one of claims 1 to 19, wherein the electronic card (30) is configured to trigger an alert if the detector (42) detects an absence of the part (41).

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