Card Reader Contact Array for Compact Mobile Design
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Solution Overview
Problem
Conventional chip card readers are bulky due to their design focus on function rather than size, making them less portable and inconvenient for mobile use.
Innovation Solution
A mobile chip card reader with open sides and a high-density contact array that allows lateral movement of the card during insertion, enabling communication with the card through a subset of contacts selected based on power draw and protocol responses, and featuring a transparent panel for alignment and user feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed sides with fixed width are used to constrain the chip card, then the chip card will not move laterally and reliable contact is ensured, but the card reader becomes bulky and less portable
Solution Approach 1:
The contact structure is segmented into multiple individual reader contacts arranged in an array, allowing selective engagement with card contacts. This segmentation enables the card reader to identify and use only the necessary contact points, reducing the need for rigid structural constraints and allowing for a more compact design.
Solution Approach 2:
The system transitions from a static, fixed-width housing to a dynamic contact identification process. The card reader dynamically determines which reader contacts are engaged with card contacts during operation, allowing the structure to adapt to varying card positions without requiring rigid physical constraints.
2Volume of moving object
If open sides are used to allow lateral movement, then the card reader width can be reduced, but the chip card may move laterally during insertion
Solution Approach 1:
The system incorporates feedback through the circuitry that detects which reader contacts are engaged with card contacts. This feedback mechanism allows the card reader to identify successful contact engagement and adjust or repeat the insertion process if lateral misalignment occurs, maintaining position stability without requiring rigid structural constraints.
Solution Approach 2:
The mechanical constraint system (closed sides with fixed width) is replaced with an electrical detection system that identifies contact engagement through the contact array. This substitution allows lateral movement freedom while maintaining reliable communication through electronic detection of successful contact.
3Adaptability or versatility
If a contact array with more contacts than card contacts is used, then multiple insertion positions are accommodated, but the device complexity increases
Solution Approach 1:
The contact array serves multiple functions: it provides mechanical contact points, enables position detection, and facilitates communication. By making the contact structure multi-functional, the system accommodates various insertion positions without requiring separate mechanisms for each function, thereby managing complexity while enhancing versatility.
Solution Approach 2:
The contact array automatically identifies which contacts are engaged through the circuitry's detection capabilities. The system self-configures to use only the engaged contacts for communication, eliminating the need for manual configuration or complex control mechanisms to manage the large number of available contacts.
Data Source
AI summary
A card reader, comprising: a frame having a slot for insertion of a chip card that has a plurality of card contacts, wherein the slot has open sides that allow the chip card to move laterally during the insertion; a plurality of reader contacts coupled to the frame and positioned in the slot in a position to be contacted by the card contacts when the chip card is inserted in the slot, and circuitry configured to communicate with the chip card through the plurality of card contact, wherein there are more reader contacts than card contacts and the circuitry is configured to determine which subset of the reader contacts engages the card contacts and to communicate with the chip card through the subset of reader contacts.