POS machine LCD screen tamper circuit

Abstract

The utility model discloses a POS machine LCD screen anti-tamper circuit comprising an upper layer FPC and a lower layer FPC, the upper layer FPC is provided with a first hole, and the lower layer FPC is provided with a second hole corresponding to the first hole. The PET layer is arranged in the first hole and connected with the upper-layer FPC, the upper-layer silver paste circuit is printed on the upper end face of the PET layer, the lower-layer silver paste circuit is printed on the lower end face of the PET layer and communicated with the upper-layer silver paste circuit, the lower-layer silver paste circuit is communicated with the upper-layer FPC, and the upper-layer FPC is communicated with the lower-layer FPC. The flexible printed circuit board has the advantages that the PET layer is arranged, the upper-layer silver paste circuit and the lower-layer silver paste circuit which are printed on the PET layer are used for protecting the upper-layer FPC and the lower-layer FPC, and compared with a traditional wire arrangement mode of three layers of FPCs, the flexible printed circuit board can save the use amount of one layer of FPC, improve the production efficiency and achieve cost compression.

Description

Technical Field

[0001] The utility model relates to the field of payment equipment, in particular to an anti-disassembly circuit for an LCD screen of a POS machine. Background Art

[0002] LCD screen is short for liquid crystal display screen. As an efficient payment device, POS machine displays payment information through LCD screen. In order to ensure the safety of the entire payment device, an anti-tampering circuit is set on the LCD shielding backplane. The FPC lead of the existing anti-tampering circuit is wrapped by bonding, and usually three layers of FPC are required. Among them, the lower layer FPC and the middle layer FPC are responsible for connecting the LCD screen and the POS machine motherboard as functional circuits, and the upper layer FPC is bonded to the middle layer FPC and the lower layer FPC as a protection circuit. Once the upper layer FPC as a protection circuit is damaged, the functional circuit is disconnected and an alarm is triggered. Although this design can ensure safety effects, it is expensive and inconvenient to assemble.

[0003] In view of this, it is necessary to provide a POS machine LCD screen anti-tampering circuit. Summary of the invention

[0004] The utility model provides a POS machine LCD screen disassembly prevention circuit, which effectively solves the problem that the existing protection circuit is inconvenient to assemble and has high cost.

[0005] The technical solution adopted by the utility model is

[0006] A POS machine LCD screen anti-disassembly circuit comprises an upper FPC and a lower FPC, wherein the upper FPC is provided with a No. 1 hole, and the lower FPC is provided with a No. 2 hole corresponding to the No. 1 hole, and further comprises a PET layer arranged in the No. 1 hole and connected to the upper FPC, an upper silver paste circuit printed on the upper end surface of the PET layer, and a lower silver paste circuit printed on the lower end surface of the PET layer and conductive with the upper silver paste circuit, wherein the lower silver paste circuit is conductive with the upper FPC, and the upper FPC is conductive with the lower FPC.

[0007] Furthermore, the PET layer is connected to the upper FPC layer by heat pressing.

[0008] Furthermore, the PET layer is provided with vertical through holes, silver dots are provided in the vertical through holes, and the upper silver paste circuit and the lower silver paste circuit are connected through the silver dots.

[0009] Furthermore, the upper FPC includes an upper substrate and an upper conductor arranged in the upper substrate, and the lower FPC includes a lower substrate and a lower conductor arranged in the lower substrate.

[0010] Furthermore, a glue layer is provided between the upper FPC layer and the lower FPC layer.

[0011] The beneficial effects of the utility model are as follows: by setting a PET layer, the upper and lower silver paste circuits printed on the PET layer are used to protect the upper and lower FPCs. Compared with the traditional three-layer FPC wiring method, it can save one layer of FPC, improve production efficiency, and achieve cost compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an exploded view of the POS machine LCD screen anti-tampering circuit provided in an embodiment of the present application.

[0013] Markings in the figure are: 1, lower layer FPC; 2, upper layer FPC; 3, PET layer; 4, upper layer silver paste circuit; 5, lower layer silver paste circuit; 100, hole No. 1. DETAILED DESCRIPTION

[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0015] like Figure 1 As shown, an anti-disassembly circuit for an LCD screen of a POS machine provided in an embodiment of the present application comprises an upper FPC2 and a lower FPC1, wherein the upper FPC2 is provided with a No. 1 hole 100, and the lower FPC1 is provided with a No. 2 hole corresponding to the No. 1 hole 100, and further comprises a PET layer 3 arranged in the No. 1 hole 100 and connected to the upper FPC2, an upper silver paste circuit 4 printed on the upper end surface of the PET layer 3, and a lower silver paste circuit 5 printed on the lower end surface of the PET layer 3 and conductively connected to the upper silver paste circuit 4, wherein the lower silver paste circuit 5 is conductively connected to the upper FPC2, and the upper FPC2 is conductively connected to the lower FPC1.

[0016] In actual use, the POS machine LCD screen anti-tampering circuit of the present application uses the lower layer FPC1 and the upper layer FPC2 as functional circuits to electrically conduct the LCD screen and the POS machine mainboard. The PET layer 3, the upper layer silver paste circuit 4 and the lower layer silver paste circuit 5 are used as protection circuits to protect the lower layer FPC1 and the upper layer FPC2. When the POS machine LCD screen anti-tampering circuit of the present application is physically damaged and a circuit is broken, the circuit between the upper layer silver paste circuit 4 and the lower layer silver paste circuit 5 is disconnected, and the mainboard signal of the POS machine LCD screen is disconnected, so that the POS machine LCD screen control system is locked to achieve a protective effect.

[0017] In the above design, by setting the PET layer 3, the upper FPC2 and the lower FPC1 are protected by the upper silver paste circuit 4 and the lower silver paste circuit 5 printed on the PET layer 3. Compared with the traditional three-layer FPC wiring method, it can save one layer of FPC, improve production efficiency, and achieve cost compression.

[0018] Specifically, the PET layer 3 is connected to the upper layer FPC2 by heat pressing.

[0019] In the above design, the PET layer 3 and the upper layer FPC2 are connected by heat pressing, which can effectively ensure the firmness between the PET layer 3 and the upper layer FPC2.

[0020] Specifically, the PET layer 3 is provided with a vertical through hole, a silver dot is provided in the vertical through hole, and the upper silver paste circuit 4 and the lower silver paste circuit 5 are connected through the silver dot.

[0021] In actual use, when the upper silver paste circuit 4 is damaged, the circuit formed by the lower silver paste circuit 5 and the upper silver paste circuit 4 is disconnected.

[0022] In the above design, the connection relationship between the PET layer 3, the upper silver paste circuit 4, the lower silver paste circuit 5 and the silver dots can not only ensure the support of the upper silver paste circuit 4 and the lower silver paste circuit 5, but also ensure the conduction between the upper silver paste circuit 4 and the lower silver paste circuit 5.

[0023] Specifically, the upper FPC2 includes an upper substrate and an upper conductor disposed in the upper substrate, and the lower FPC1 includes a lower substrate and a lower conductor disposed in the lower substrate.

[0024] In the above design, the structural design of the upper layer FPC2 and the lower layer FPC1 can ensure effective circuit connection.

[0025] Specifically, a glue layer is provided between the upper layer FPC2 and the lower layer FPC1.

[0026] In the above design, the upper layer FPC2 and the lower layer FPC1 are connected by a glue layer to ensure the firmness between the upper layer FPC2 and the lower layer FPC1.

[0027] To further explain in detail, it should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A POS machine LCD screen anti-tampering circuit, comprising an upper layer FPC (2) and a lower layer FPC (1), characterized in that: The upper FPC (2) is provided with a No. 1 hole (100), and the lower FPC (1) is provided with a No. 2 hole corresponding to the No. 1 hole (100), and further comprises a PET layer (3) arranged in the No. 1 hole (100) and connected to the upper FPC (2), an upper silver paste circuit (4) printed on the upper end surface of the PET layer (3), and a lower silver paste circuit (5) printed on the lower end surface of the PET layer (3) and conductively connected to the upper silver paste circuit (4); the lower silver paste circuit (5) is conductively connected to the upper FPC (2), and the upper FPC (2) is conductively connected to the lower FPC (1).

2. The POS machine LCD screen anti-tampering circuit according to claim 1, characterized in that: The PET layer (3) is connected to the upper FPC layer (2) by heat pressing.

3. The POS machine LCD screen anti-tampering circuit according to claim 1, characterized in that: The PET layer (3) is provided with a vertical through hole, a silver dot is provided in the vertical through hole, and the upper silver paste circuit (4) and the lower silver paste circuit (5) are connected through the silver dot.

4. The POS machine LCD screen anti-tampering circuit according to claim 1, characterized in that: The upper FPC (2) comprises an upper substrate and an upper conductor arranged in the upper substrate, and the lower FPC (1) comprises a lower substrate and a lower conductor arranged in the lower substrate.

5. The POS machine LCD screen anti-tampering circuit according to claim 1, characterized in that: An adhesive layer is provided between the upper layer FPC (2) and the lower layer FPC (1).

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