Card Reader Foreign Object Detection via Shutter Mechanism
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Solution Overview
Problem
Card readers face challenges in detecting insert skimmers, which are devices illegally attached to read magnetic data, as existing detection methods are not effective against sophisticated skimming techniques, leading to potential fraud in financial institutions.
Innovation Solution
A card reader design incorporating a main body with a card conveyance path, first and second card detection mechanisms, a shutter member, and a control unit that moves the shutter to close the path when an object is detected by the second mechanism but not the first, and detects foreign objects if the shutter does not move to the closed position, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing detection methods are used to detect insert skimmers, then the card reader structure remains simple, but the detection accuracy and reliability are insufficient against sophisticated skimming techniques
Solution Approach 1:
The detection system is segmented into multiple independent detection mechanisms: a first card detection mechanism upstream of the main body, a second card detection mechanism within the main body, and a shutter member with its own detection mechanism. Each segment detects specific aspects of card insertion, and their combined results provide comprehensive foreign object detection capability.
Solution Approach 2:
The shutter member acts as an intermediary element between the first and second card detection mechanisms. It physically blocks the card conveyance path when closed, and its state is detected by the shutter state detector. This intermediary provides an additional detection dimension that helps distinguish between legitimate cards and foreign objects.
2Measurement precision
If multiple detection mechanisms are added to improve foreign object detection, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
The shutter member serves multiple functions simultaneously: it physically closes the card conveyance path to prevent card insertion, acts as a mechanical barrier, and its position is detected by the shutter state detector to provide detection information. This merging of functions reduces the need for separate detection components.
Solution Approach 2:
The shutter member is a multi-functional component that performs both mechanical blocking and detection purposes. By making the shutter system universal (serving both protection and detection functions), the patent reduces overall system complexity while maintaining high detection precision.
Data Source
AI summary
A card reader may include a main body part having a conveyance path;a first card detection mechanism disposed upstream of the main body part; a second card detection mechanism disposed in the main body part at a distance less than a length of the card from the first card detection mechanism; a shutter member disposed between the first and second card detection mechanisms; a shutter state detector; and a control unit. The control unit may be structured to close the shutter member when an object is detected by the second card detection mechanism after being detected by the first card detection mechanism, and then the inserted object is not detected by the second card detection mechanism while the inserted object is not detected by the first card detection mechanism; and detect that an object other than the card has been inserted when the shutter member close after the control.