CN111028443A

CN111028443A - Two-sided protection apron of POS machine

Info

Publication number: CN111028443A
Application number: CN201911327581.9A
Authority: CN
Inventors: 沈勇坚; 胡永刚; 王翔平
Original assignee: Dynamicode Co Ltd
Current assignee: Dynamicode Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-17

Abstract

The invention discloses a POS machine double-sided protection cover plate which comprises a protection plate, wherein one side of the protection plate is connected with a mainboard, at least three anti-dismantling signal circuits are arranged on the surface, the anti-dismantling signal circuits are respectively connected with a conductive bar on the mainboard and then connected with a safety chip on the mainboard, three anti-dismantling switches are arranged on the other side of the protection plate, each anti-dismantling switch is connected with one anti-dismantling signal circuit, and the anti-dismantling signal circuits connected with the three anti-dismantling switches are different. The invention has simple structure and low cost, and greatly improves the safety.

Description

Two-sided protection apron of POS machine

Technical Field

The invention relates to a protective cover plate, in particular to a double-sided protective cover plate of a POS machine.

Background

In order to protect the security sensitive signals, the conventional POS generally uses a protection board to cover and protect the whole security area, so as to protect the security signals on the motherboard, including PADs, traces, vias, and resistors and capacitors of the security signals.

The existing protection board is basically a multi-layer hard board HDICPCB covered by a protection mesh wire, and the protection board has higher cost and longer production period.

Disclosure of Invention

The invention aims to solve the problems and provides a double-sided protective cover plate of a POS machine.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a POS machine two-sided protection apron, POS machine two-sided protection apron includes a protection shield, protection shield one side and mainboard connection, and be equipped with at least three on this face and prevent tearing open signal circuit, these several prevent tearing open signal circuit earlier with the busbar on the mainboard be connected, be connected with the safety chip on the mainboard again, be equipped with the three on the protection shield another side and prevent tearing open the switch, every prevents tearing open the switch and prevents tearing open signal circuit connection with one, and the signal circuit is all inequality in preventing tearing open that this three prevents tearing open the switch connection.

In a preferred embodiment of the present invention, the protection board is a single-layer PCB board.

In a preferred embodiment of the present invention, each tamper-evident signal circuit forms a meander-shaped trace on one side of the protective plate, which meander-shaped trace fills the cover.

In a preferred embodiment of the present invention, the meander-shaped traces of the three tamper-proof signal circuits connected to the three tamper-proof switches, respectively, on one surface of the protection board are respectively upstream of the respective tamper-proof switches.

In a preferred embodiment of the present invention, the pads on the conductive strips on one side of the protective plate are covered by the tamper switch on the other side of the protective plate, and at least one pad is opposite in polarity to the tamper switch.

In a preferred embodiment of the present invention, the through hole of each loop trace is located in the corresponding tamper switch.

The invention has the beneficial effects that:

the invention has simple structure and low cost, and greatly improves the safety.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the surface A of the present invention;

FIG. 2 is a schematic view of the side B of the present invention;

fig. 3 is a schematic diagram of a trace sequence according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1 and 2, the present invention provides a double-sided protective cover for a POS device, which includes a protective plate 100.

The protection board 100 may be a single-layer double-sided PCB, one side of which is a side a and the other side of which is a side B.

The a surface is used as a security area facing the main board, and a PAD is disposed on the a surface to connect the conductive strip 110, for example, the conductive strip 110 is provided with a corresponding PAD 111, so that the protection board 100 is connected to the main board of the POS machine through the conductive strip 110.

As shown in fig. 2, the B surface of the protection plate 100 is a back surface facing the housing. Three anti-tamper switches 300 are provided and are connected to independent anti-tamper signals, respectively.

On the basis, the multi-path anti-dismantling signal circuits 200 are further arranged on the surface A, the routing of the anti-dismantling signal circuits 200 on the surface A can form a zigzag routing which is distributed on the surface A, the anti-dismantling signal circuits 200 are connected to the PAD of the surface A to be connected with the conductive strips, then are connected to the safety chip of the mainboard, and are monitored in real time by the protection alarm device of the safety chip.

The multi-channel anti-disassembly signal circuit 200 finally respectively moves to the anti-disassembly switches corresponding to the B surfaces. By way of example, in the present embodiment, three anti-tamper signal circuits 200 are used, and the three anti-tamper signal circuits 200 finally go to three anti-tamper switches on the B-plane, i.e., three anti-tamper switches 300 are connected to different anti-tamper signal circuits 200 respectively.

In addition, the loop-shaped trace formed by each tamper-proof signal circuit 200 is located upstream of the corresponding tamper-proof switch 300 in the tamper-proof signal transmission direction, so that even if each tamper-proof switch 300 on the B-side is damaged, the loop-shaped trace formed by each tamper-proof signal circuit 200 on the a-side can also play a role in protection.

As each anti-dismantling signal circuit 200 on the surface A is also respectively connected with the conductive bar 110 and then directly connected with the security chip on the mainboard, and the security chip on the mainboard is connected with the alarm device, the anti-dismantling signal circuits and the loop-shaped wiring formed when the anti-dismantling signal circuit 200 is connected with the anti-dismantling switch 300 can be directly monitored through the alarm device, once the anti-dismantling switch 300 or the loop-shaped wiring is attacked and disconnected or short-circuited, the alarm device can give an alarm, and the security chip can erase all sensitive information in the POS machine. Therefore, the key information of the POS machine is protected from being stolen, and the safety is improved.

In addition, different from in the HDI board among the traditional design, punching of inlayer line, hole on every layer is all protected by the one deck line to realize the design scheme that the one deck protected the next floor, based on the characteristics that whole PCB board is single-deck double-sided structure in this example, only go on back the shape at the A face and walk the line, punch the corresponding anti-unpacking of B face after the wire winding of A face is accomplished at last and close.

Furthermore, in this example, the pad 111 on the conductive strip 110 on the a side is covered by the tamper switch 300 on the B side, and the polarity of at least 1 tamper signal on the conductive strip 110 is necessarily opposite to that of the tamper switch. By way of example, see fig. 3, which shows a solution in which the polarity of the tamper signals of pin2 and pin4 on the left side conductive strip 110 is opposite to the polarity of the tamper switch (connected to pin3) covering it. This does not allow direct detection of the conductive strip from the housing without destroying the tamper switch, nor does it allow simple detection of the conductive strip and the pad 111 after the tamper switch has been destroyed. Through the arrangement of the structure, the tamper switch 300 can simultaneously protect the tamper signal circuit 200, the conductive strip 110 and the pad 111 on the a surface.

Further, since at least one pad 111 of the conductive strip 110 is opposite to the polarity of the tamper switch 300 covering the conductive strip, even if all three tamper switches 300 are damaged, the conductive strip 110 is tried to be short-circuited by drilling, but since the pad 111 of the conductive strip 110 is opposite to the polarity of the tamper switch 300, at least one tamper signal circuit 200 on the a-plane can also play a role in protection, thereby further improving the security.

Referring to fig. 3, in order to enable the above function to be realized only by providing the above structure on the single-layer protection plate 100, the routing sequence on the protection plate is rearranged in the present embodiment.

The levels of the two adjacent anti-splitting signals of the pads 3 and 4 (i.e. the pins 3 and 4) are opposite in polarity, namely the pads 2 and 3 (i.e. the pins 2 and 3) on the left conductive strip (i.e. the conductive strip T1) and the right conductive strip (i.e. the conductive strip T2).

The tamper signal on pad 2 on bus bar T1 is passed through the left bus bar onto the protection board, in upstream and downstream order, first around the serpentine guard line M1 on the board, and then through a tamper switch S1 to pad 2 of bus bar T2. Tamper switch S1 covers pads 3 and 4 on conductive strip T2. Any attempt to drill a tamper switch will result in an alarm, since the polarity of the tamper signal at pad 2 on conductive strip T2 is opposite to the polarity of the tamper signal at pad 3 on conductive strip T2.

The tamper signal on pad 3 on bus bar T2 is applied to the protective panel via bus bar T2, first by winding serpentine M2 on the panel, and then via tamper switch S2 to pad 3 on the left bus bar T1. This tamper switch covers pads 2 and 3 protecting the left conductive strip T1.

The tamper signal on pad 4 on bus bar T2 is routed through the right bus bar T2 to the protection board, first around serpentine M3 on the board, and then through tamper switch S3 to pad 4 on the left bus bar T1.

According to the upstream and downstream order of the tamper signals, even after all three tamper switches are broken, the serpentine guard line of the tamper signals remains effective and covers the area of the entire guard plate. The pad 4 of the left conductive strip and the pad 2 of the right conductive strip are respectively at the most downstream of the respective tamper signal without special protection.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a POS machine two-sided protection apron, its characterized in that, POS machine two-sided protection apron includes a protection shield, protection shield one side and mainboard connection, and be equipped with at least three on this face and prevent tearing open signal circuit, these several prevent tearing open signal circuit earlier with the busbar on the mainboard be connected, be connected with the safety chip on the mainboard again, be equipped with three on the protection shield another side and prevent tearing open the switch, every prevents tearing open the switch and prevents tearing open signal circuit and be connected with one, and the signal circuit is all inequality in preventing tearing open that this three prevents tearing open the switch connection.

2. The double-sided protective cover sheet for POS machine according to claim 1, wherein the protective sheet is a single-layer PCB.

3. The dual-sided protective cover sheet of a POS machine of claim 1, wherein each tamper-proof signal circuit forms a loop-shaped trace on one side of the protective sheet, the loop-shaped trace lining the cover side.

4. The dual-sided protective cover of a POS machine of claim 3, wherein the zigzag traces of the three tamper-proof signal circuits on one side of the protective plate, which are connected to the three tamper-proof switches, are respectively upstream of the respective tamper-proof switches.

5. The dual-sided protective cover sheet for POS machine of claim 1, wherein the pads on the conductive strip on one side of the protective sheet are covered by the tamper switch on the other side of the protective sheet, and at least one pad has a polarity opposite to that of the tamper switch.

6. The dual-sided protective cover of a POS machine of claim 4, wherein the through hole of each loop trace is located within the corresponding tamper switch.