MEMORY CARD READER BODY WITH PROTECTIVE MESH ON BOTH SIDES

Abstract

A memory card reader body includes proposed, on an internal face, a receiving recess to receive a memory card connector. The receiving recess has electrically conductive tracks forming a protective mesh for the memory card connector. The conductive tracks are such that they also extend on an external face of the memory card reader body through vias passing through the internal and external faces.

Claims

1. A memory card reader body comprising: an internal face and an external face; on the internal face, a receiving recess to receive a memory card connector, the receiving recess comprising at least one electrically conductive track forming a protective mesh for the memory card connector wherein said at least one electrically conductive track also extends the external face of the memory card reader body through at least one via passing through said internal and external faces.

2. The memory card reader body according to claim 1, comprising at least one electrically conductive track of an active-signal-conducting type, each extremity of which is terminated by a connection pin situated on the internal face, said electrically conductive track of an active-signal-conducting type extending from the internal face towards the external face through a first electrically conductive through hole and from the external face towards the internal face through a second electrically conductive through hole.

3. The memory card reader body according to claim 1, furthermore comprising at least one electrically conductive track of a ground type, each extremity of which is terminated by a connection pin situated on the internal face, said at least one electrically conductive track of a ground type extending from the internal face to the external face through a third electrically conductive through hole and from the external face to the internal face through a fourth electrically conductive through hole.

4. The memory card reader body according to claim 1, wherein the external face is covered with a thermosetting resin.

5. The memory card reader body according to claim 1, wherein the external face is covered with a thermoplastic resin.

6. The memory card reader body according to claim 1, comprising a protective cover mounted on the external face.

7. The memory card reader body according to claim 6, wherein said protective cover is sealed to the external face by a thermosetting glue or cyanoacrylate glue.

8. The memory card reader body according to claim 1, wherein said internal face and/or said external face has at least one area in relief on which said at least one electrically conductive track extends.

9. The memory card reader body according to claim 1, wherein said at least one electrically conductive track takes the form of a loop having a determined geometrical shape.

10. A memory card reader comprising the reader body according to claim 1.

11. A terminal comprising the memory card reader according to claim 10.

12. A method for manufacturing a protective mesh of a memory card connector for a memory card reader body, wherein the method comprises: defining a geometrical shape of at least one electrically conductive track extending on internal and external faces of said memory card reader body by means of at least through via passing through said internal and external faces; defining a location of said at least one through via; forming said at least one conductive track and said at least one through via on the memory card reader body.

Description

4. LIST OF FIGURES

[0039] Other features and characteristics of the invention shall appear from the following description, given by way of an indicative and non-exhaustive example, and from the appended drawings of which:

[0040] FIG. 1, already described with reference to the prior art, shows a classic example of the architecture of a memory card reader before assembly;

[0041] FIGS. 2 and 3, already described with reference to the prior art, present an example of a classic architecture of a memory card reader body provided with a memory card connector;

[0042] FIGS. 4A and 4B present a top view and a bottom view of a memory card reader body according to one particular embodiment of the invention;

[0043] FIGS. 5A, 5B, 5C, 5D each illustrate a simplified example of the electrical diagrams of a protective mesh according to the invention, comprising four through vias;

[0044] FIG. 6 illustrates another simplified example of a schematic electrical diagram of a protective mesh according to the invention, comprising six through vias.

[0045] FIG. 7 illustrates the memory card reader body of FIGS. 4A and 4B provided with a protective cover according to one particular embodiment of the invention.

5. DETAILED DESCRIPTION

[0046] In all the figures of present document, the identical elements and steps are designated by one and the same numerical reference.

[0047] We shall strive more particularly in the following description to describe the invention in the context of electronic payment terminals. The invention of course is not limited to this particular field of application but is of interest for any type of terminal that can include a memory card reader.

[0048] The general principle of the invention relies on the implementing of an electrical protective mesh configured on both sides on the memory card reader body as illustrated in FIGS. 4A and 4B.

[0049] The top view illustration in FIG. 4A shows the internal face of a memory card reader body 100 and the top view illustrated in FIG. 4B shows the external face of the memory card reader body 100 according to one particular embodiment of the invention. The internal face is the face to which the connector of said memory card gets attached.

[0050] The memory card reader body 100, which has a generally rectangular parallelepiped shape, comprises a receiving recess 180 on its internal face for receiving a memory card connector. The receiving recess 180 has a pre-determined volume shape: it enables protection of the memory card connector from external intrusion while at the same time creating the space needed for the insertion and the reading of a smartcard type of memory card. The receiving recess 180 comprises a plurality of electrically conductive tracks 200 forming a protective mesh for the memory card connector. As illustrated in the figure, the conductive tracks 200 are laid out on the internal face in such a way that the protective mesh generally covers the surface of the receiving recess 180 that is to receive the memory card connector. Each conductive track takes the form of a loop, each end of which terminates in a contact pin (or connection pin).

[0051] The receiving recess 180 furthermore comprises, on its internal surface, a contact zone (or connection zone) 220 in which the contact pins of the protective mesh are grouped together. The contact zone 220 is intended for connection to the memory card connector. Once the memory card connector is integrated into the receiving recess 180, the contact pins are connected to the electronic circuit, which ensures the operation of the electronic payment terminal, by means of an elastomer connector, for example of the Zebra (registered mark) type. For example, the contact zone comprises six contact pins 220 as shown in FIG. 4A.

[0052] According to the invention, the conductive tracks 200 extend without interruption on the external face of the memory card reader body 100 by means of electrically conductive through holes (also called vias here below) so as to extend the protective mesh from the internal face towards the external face of the memory card reader body 100. The through vias are illustrated by the encircled area referenced 150. Each via is a through hole providing the electrical link from a conductive track of the internal face (the front face) towards the external face (the back face or from the external face (the back face) towards the internal face (the front face). Thus; since the protective mesh is dual-faced (i.e. front/back)), it has a protective surface that is greater than that of the prior art solutions, reducing the possibilities of intrusion by malicious third parties (especially by the machining of the external face).

[0053] The vias in the present example are grouped together within a same area of the memory card reader body 100. Naturally, this is an illustratory example and other configurations can be envisaged without departing from the context of the invention. For example, the vias can be distributed disparately on the faces of the memory card reader body 100.

[0054] The conductive tracks 200 are laid out on the external face in such a way that the protective mesh appreciably covers the entire external surface of the memory card reader body. Indeed, the greater the surface covered by the conductive tracks 200, the greater is the level of detection of intrusions. The tracks have a geometrically pre-determined shape.

[0055] The conductive tracks 200 are printed on both faces of the memory card reader body 100 by means of a laser-etching technique such as the LDS technique for example.

[0056] In the example illustrated herein, the receiving recess 180 comprises two conductive loops: a first type of loop dedicated to the transmission of the active input/output signal (denoted as I/O in the figure) and a second type of loop dedicated to setting up a reference potential, also called a ground (denoted as GND in the figure). As explained further above, each loop extremity terminates in a connection pin.

[0057] The first I/O conductive loop extends without interruption from the internal face to the external face of the reader body by means of a first through via 150.sub.2 and from the external face to the internal face by means of a second through via 150.

[0058] The second conductive loop GND extends without interruption from the internal face to the external face of the reader body by means of a third through via 150.sub.1 and from the external face to the internal face by means of a fourth through via 150.sub.4.

[0059] In order to increase the chances of detecting fraudulent intrusion, the surface of the memory card reader body is designed so as to have, on its external face and/or its internal face, one or more features in relief on which there extend the electrical tracks 200. These features in relief can take the form of breaks or steps 160 thus enabling the forming of protective mesh with a 3D structure.

[0060] We refer now to FIGS. 5A, 5B, 5C and 5D each of which illustrates an example of a simplified electrical diagram of a protective mesh according to the invention, implementing four through vias. This is a protective mesh situated on the external face of the memory card reader body.

[0061] Referring to FIG. 5A: [0062] the conductive track 10a which corresponds to the input-output signal I/O extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30a.sub.2 and 30a.sub.3 and [0063] the conductive track 20a extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30a.sub.1 and 30a.sub.4. Referring to FIG. 5B: [0064] the conductive track 10b which corresponds to the input-output signal I/O extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30b.sub.2 and 30b.sub.3 and [0065] the conductive track 20b extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30b.sub.1 and 30b.sub.4. Referring to FIG. 5C: [0066] the conductive track 10c which corresponds to the input-output signal I/O extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30c.sub.2 and 30c.sub.3 and [0067] the conductive track 20c extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30c.sub.1 and 30c.sub.4. Referring to FIG. 5D: [0068] the conductive track 10d which corresponds to the input-output signal I/O extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30d.sub.2 and 30d.sub.3 and [0069] the conductive track 20d extends without interruption from the internal face to the external face of the reader body in passing through the through vias 30d.sub.1 and 30d.sub.4.

[0070] In these configurations, the reader body has a set of four through vias and two conductive loops.

[0071] It will be understood that, by means of the through vias, the conductive loop I/O and the conductive loop GND traditionally laid out on the internal face of the memory card reader body are extended at least partially on the external face of said body.

[0072] FIG. 6 illustrates another example of a simplified electrical diagram of a protective mesh according to the invention implementing six through vias.

[0073] The conductive track 70 represents the ground and passes through the through vias 80.sub.1 and 80.sub.4. The conductive track 60 represents the active input-output I/O signal. The conductive track 60 consists of a first track portion 60.sub.1 (Mesh In) situated on the external face of a second track part 60.sub.2 situated on the internal face of a third track part 60.sub.3 (Mesh Out) situated on the external face. The passages of the track 60 from the internal face to the external face or the external face to the internal face are provided by through vias 80.sub.2, 80.sub.4, 80.sub.6, 80.sub.6. The second track part 60.sub.2 forms a bridge between the internal face enabling the electrical connection of the first and third track parts situated on the external face of the memory card reader body. This particular configuration further slows down attacks by malicious third parties because it is not possible, by shorting a track part (or loop part), to deactivate the entire track of (or the entire loop).

[0074] This particular solution furthermore shows that by increasing the number of through vias while preserving the number of signals or loops (one ground and one I/O signal), the number of electrical configurations that can be envisaged increases in a combinatory manner.

[0075] These are of course examples given purely by way of an illustration. Other electrical configurations based on the same principle can be envisaged without departing from the framework of the invention.

[0076] In addition, the external face of the memory card reader body 100 is covered with an opaque thermosetting protective resin (for example a two-component epoxy resin of the LOCTITE 9497, LOCTITE 9466 or LOCTITE 9464 type). Thus, accessing sensitive signals through the external face without breaking the conductive tracks is made extremely difficult. Indeed, a thermosetting resin is both hard and brittle. The opaqueness of the resin makes the conductive tracks non-visible through this resin. A thermoplastic protective resin can also be envisaged as a variant of implementation, but it nevertheless has the defect of being easily deteriorated by heat. An acrylate type resin fulfilling the same function can also be used within the framework of the invention.

[0077] As illustrated in FIG. 7, the memory card reader body 100 can include a protective cover 700 mounted on its external face. The cover can be sealed to the external face by means of a thermosetting glue or cyanoacrylate glue (for example of the CYANO 406 type). The cover can be made out of thermosetting or thermoplastic material. It is also possible to envisage making the cover out of metal. In this case, it is necessary to plan for a thickness of glue or resin that is great enough to prevent any interference between the cover and the conductive tracks.

[0078] Those skilled in the art will choose the material of the reader body (at least on its external face side) so that it is compatible in terms of adhesion with the resin or the glue used to protect the reader body. Similarly, the material of the cover will be chosen in such a way that it is compatible with the resin or the glue used.

[0079] Finally, we describe here below the main steps of the method for manufacturing a protective mesh for a memory card reader body according to one particular embodiment of the invention. First of all, a geometrical shape is defined for the electrically conductive tracks extending on the internal and external faces of the memory card reader body. The location of the vias passing through said internal and external faces is also defined. Then, said conductive tracks are made by means of a laser-etching technique (LSD for example) on the internal and external faces of the memory card reader body along with the through vias, using a mechanical drilling or laser drilling operation. The protective mesh thus formed includes conductive tracks on both sides. The protection surface is thereby increased as compared with the prior art solutions, reducing the possibilities of external intrusion. It must be noted that the geometrical shape of the tracks and the location of the vias can be chosen respectively from among a plurality of predetermined geometrical shapes and a plurality of predetermined locations. This makes it external intrusions even more difficult to carry out.