Flexible Tamper Circuit for Fuel Dispenser Input Removal Detection
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Solution Overview
Problem
Existing payment system input devices, such as card readers and PIN pads, lack sufficient security against unauthorized removal and tampering, failing to meet the increasing security demands of payment card companies.
Innovation Solution
A flexible circuit assembly with tamper-responsive electronics and conductor circuits is integrated into the payment system, featuring a switch portion and a cable connecting the connector and switch portions, which is mounted to a printed circuit board, providing enhanced security by detecting unauthorized removal attempts and responding with appropriate actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable-based switches or microswitches are used for anti-removal mechanisms, then some degree of protection is provided, but the security is insufficient to meet new payment card company mandates
Solution Approach 1:
The patent embeds the switch assembly within the connector housing, creating a nested structure where the switch is protected by the housing and the connector assembly is integrated into the circuit board. This nesting provides multiple layers of protection without significantly increasing overall device complexity
Solution Approach 2:
The patent uses a flexible circuit board design with a thin flexible member that contains the switch and conductor circuits. This flexible structure allows the security mechanism to be integrated into the connector without adding rigid bulk, maintaining ease of manufacture while improving security
2Strength
If switches are positioned in hard to access locations, then cable and switch protection is improved, but the complexity of installation and maintenance increases
Solution Approach 1:
The patent combines the switch, connector, and housing into a single integrated assembly that is manufactured as one unit. This merging eliminates the need for separate installation steps for the switch and connector, making manufacturing easier while still providing protection through the integrated structure
Solution Approach 2:
The flexible circuit board design allows the switch assembly to be self-contained and self-protecting through its integrated housing and embedded switch structure. The design serves itself by incorporating the protection mechanisms within the normal operational components, eliminating the need for additional maintenance interventions
Data Source
AI summary
A system for detecting unauthorized removal or tampering. The system comprises a printed circuit board having tamper-response electronics and a flexible circuit assembly defining a connector portion, a switch portion, and a cable extending between the connector portion and the switch portion. The flexible circuit assembly is coupled with the printed circuit board at the connector portion. The flexible circuit assembly comprises a plurality of layers each comprising a flexible dielectric substrate and a switch disposed in the switch portion. The switch is in electrical communication with the tamper-response electronics of the printed circuit board via a conductive path. The flexible circuit assembly also comprises a tamper-responsive conductor circuit enclosing the conductive path. The tamper-responsive conductor circuit is in electrical communication with the tamper-response electronics of the printed circuit board.