Adaptive Magnetic Head Assembly for Card Readers
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Solution Overview
Problem
Magnetic card readers often experience read errors due to angular rotation of the card during withdrawal, especially in compact designs with shorter mount pieces, which fail to maintain alignment between the card's magnetic stripe and the reading head, leading to misalignment and reinsertion requirements.
Innovation Solution
A card reader with an adaptive magnetic head assembly featuring a rotatable card guiding element and a magnetic reading head that aligns with the card's datum edge, utilizing biasing elements like springs to maintain alignment between the magnetic stripe and the reading head, even with angular rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed card slot width is designed to accommodate the largest card width, then all cards can be inserted, but the difference between card width and slot width increases, leading to increased potential for angular rotation
Solution Approach 1:
The card guiding element is made rotatable relative to the card path, allowing it to dynamically adjust its angular position to match the inserted card's orientation. This dynamic adjustment maintains alignment between the magnetic stripe and reading head regardless of card width variations, resolving the contradiction between accommodating different card sizes and maintaining stable alignment.
2Volume of moving object
If a short mount piece is used to achieve a more compact design, then the card reader becomes more compact, but the potential for card read error caused by angular rotation increases
Solution Approach 1:
The short mount piece incorporates a rotatable card guiding element that can angularly adjust to compensate for misalignment caused by the compact design. This allows the system to maintain reliable card reading accuracy despite the reduced mount piece length that would otherwise increase susceptibility to angular rotation errors.
Solution Approach 2:
The card guiding element automatically adjusts its angular position in response to the inserted card's orientation, self-correcting for misalignment without requiring user intervention or complex external mechanisms. This self-adjusting capability maintains reading accuracy in the compact design.
3Duration of action of stationary object
If the card width becomes narrower from wear over repeated use, then the card can be reused, but the difference between card width and slot width increases, increasing angular rotation potential
Solution Approach 1:
The rotatable card guiding element continuously adapts to the current card width and orientation, maintaining proper alignment even as the card narrows from wear. This dynamic adjustment ensures reliable reading throughout the card's extended usage life, regardless of dimensional changes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adaptive magnetic head assembly effectively reduces card read errors by maintaining alignment between the card's magnetic stripe and the reading head, enhancing data reading reliability and user experience by minimizing the need for reinsertion.
Implementation Method 1
at least one biasing element that biases the datum edge of the magnetic stripe card against the card guiding element. The biasing element may include at least one spring.
Data Source
AI summary
Card readers with adaptive magnetic head assemblies are disclosed. According to one embodiment, a card reader may include chassis comprising a card slot that receives a portion of a magnetic stripe card; a card guiding element positioned in a card path defined by the card slot and that interacts with a datum edge of the magnetic stripe card, at least a portion of the card guiding element being rotatable relative to the card path; and a magnetic reading head provided on the card guiding element that reads a magnetic stripe on the magnetic stripe card. The card guiding element and the magnetic reading head rotate relative to the card path in response to the datum edge of the magnetic stripe card applying a force to the card guiding element, thereby substantially maintaining an alignment between the magnetic stripe and the magnetic reading head.