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POS machine safety contact pressure test device and test method

A technology of safety contacts and POS machines, applied in the field of testing, can solve the problems of inability to accurately measure the critical pressure value of safety contacts triggering, affecting the preload and tolerance of silicone pads, etc.

Active Publication Date: 2017-08-04
上海汇尔通信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the trigger critical pressure value of the safety contact of the POS machine is related to the design of the silicone pad. The compression of the silicone pad is the main factor that determines the trigger critical pressure value. However, in actual production, due to the manufacturing tolerance of the silicone pad, Therefore, after the whole POS machine is locked and paid, the trigger critical pressure value of the safety contact will be different from the nominal value of the safety contact at the time of design.
[0004] However, the current pressure test method for the safety contact of the POS machine is to directly measure the pressure sensor, but because the pressure sensor itself has a certain thickness, it will greatly affect the preload of the silicone pad, so that it is impossible to accurately measure the POS machine after it is locked. Threshold pressure value for triggering of safety contacts

Method used

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  • POS machine safety contact pressure test device and test method
  • POS machine safety contact pressure test device and test method
  • POS machine safety contact pressure test device and test method

Examples

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Embodiment 1

[0041] Please refer to Figure 1-2 , Embodiment 1 of the present invention is:

[0042] A POS machine safety contact pressure testing device provided by the present invention includes a circuit board, on which a safety contact is provided, on which a cantilever beam is provided, and the cantilever beam includes a free end and a circuit The fixed end of the board connection, the safety contact is set on the free end, and the fixed end is provided with a strain gauge used to obtain the strain value generated by the deformation of the connection between the cantilever beam and the circuit board, and the strain gauge and the processing The processor is used to calculate the pressure value of the safety contact of the POS machine according to the acquired strain value.

[0043] The cantilever beam is a cantilever beam cut from the original circuit board, the surrounding groove of the cantilever beam is open, and the safety contact is set at the free end of the cantilever arm, whic...

Embodiment 2

[0053] Please refer to Figure 1-2 , the second embodiment of the present invention is:

[0054] On the basis of the first embodiment above, the strain gauge is further limited, specifically: the strain gauge is located in the middle of the safety contact and the end of the fixed end. Setting the strain gauge in the middle of the safety contact and the end of the fixed end can improve the sensitivity of the strain gauge, and then can accurately obtain the strain value generated by the deformation of the connection between the cantilever beam and the circuit board, and calculate the POS based on the strain value The pressure value of the machine safety contact, the pressure value at this time is the most accurate. The strain gauges are wired to the processor. The above-mentioned strain gauges are connected by wires, and the collected strain values ​​are transmitted to the processor (the processor is a peripheral strain tester) by wire, which can improve the transmission effic...

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Abstract

The invention relates to the field of test, in particular to a POS machine safety contact pressure test device and a test method. The shape of a circuit board is cut in a special way to form a cantilever beam, and the safety contact is arranged at the free end of the cantilever beam. The influence of deformation of other parts of the circuit board on the measurement value at a measurement position of a strain gauge under the condition that a POS machine is locked can be avoided. When the joint of the cantilever beam and the circuit board deforms, the strain gauge arranged at the fixed end acquires a strain value, and the pressure value of the safety contact of a POS machine is calculated by a processor. The whole test process has nothing to do with the amount of compression of a silica gel pad. Therefore, the pressure value of the safety contact can be measured accurately under the condition that a POS machine is locked.

Description

technical field [0001] The invention relates to the testing field, in particular to a POS machine safety contact pressure testing device and testing method. Background technique [0002] There are generally one or more safety contacts on the PCB board of the POS machine, which are pre-pressed with a certain pressure value through the silicone pad. The pressure value at this time is called the trigger critical pressure value. At this time, the POS machine will be triggered to enter the security mode, and the internal information can be prevented from leaking by removing the internal information. [0003] However, the trigger critical pressure value of the safety contact of the POS machine is related to the design of the silicone pad. The compression of the silicone pad is the main factor that determines the trigger critical pressure value. However, in actual production, due to the manufacturing tolerance of the silicone pad, Therefore, after the whole POS machine is locked, ...

Claims

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Application Information

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IPC IPC(8): G01L5/00G07G1/00
CPCG01L5/00G07G1/0018
Inventor 林培春刘荣坚
Owner 上海汇尔通信息技术有限公司
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