Card Reader Magnetic Head Inclined Gap Orientation Detection
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Solution Overview
Problem
Conventional card readers fail to accurately detect the orientation of cards with magnetic data, leading to incorrect reading of magnetic data when cards are inserted with reversed front and rear faces, and cannot differentiate between cards with and without recorded data.
Innovation Solution
A card reader design with a magnetic head featuring a straight-shaped magnetic gap inclined relative to the card's insertion direction, allowing detection of magnetization reversals and peak values in the output signal to determine if a card with magnetic data is correctly oriented and recorded, using a control section to count peak values exceeding a threshold for accurate data detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a magnetic head with a straight magnetic gap parallel to the card insertion direction is used, then the structure is simple and manufacturing is easy, but the card reader cannot detect the orientation of the card or differentiate between cards with and without magnetic data
Solution Approach 1:
The magnetic gap in the magnetic head is designed to be inclined at a specific angle (10° to 75°) relative to the card insertion direction, rather than being parallel. This asymmetric configuration allows the magnetic head to detect magnetization reversals only when the card is inserted in the correct orientation, enabling orientation detection while maintaining manufacturing feasibility.
Solution Approach 2:
The inclination angle of the magnetic gap is optimized within a specific range (10° to 75°) to achieve effective detection of magnetization reversals. This parameter optimization ensures that the magnetic head can distinguish between cards with and without magnetic data while maintaining ease of manufacture within the specified angle range.
2Measurement precision
If the magnetic gap is inclined at a large angle to detect card orientation, then orientation detection improves, but the magnetic head may scratch the magnetic stripe on the card
Solution Approach 1:
The inclination angle of the magnetic gap is optimized within a specific range (10° to 75°) to balance detection effectiveness with prevention of magnetic stripe damage. This parameter optimization ensures that the magnetic head can detect magnetization reversals while minimizing mechanical contact and potential scratching of the magnetic stripe.
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
Enables reliable detection of correctly oriented cards with magnetic data, preventing scratches on the magnetic stripe and ensuring accurate data reading while suppressing false positives from unrecorded cards, with an inclination angle of the gap direction optimized between 10° to 75° for effective performance.
Implementation Method 1
a magnetic head which is provided in the card insertion part and is structured to contact with the card... reading of magnetic data recorded in a magnetic stripe of the card
Implementation Method 2
magnetic data are recorded in the magnetic stripe... to perform reading of magnetic data recorded in a magnetic stripe of the card
Data Source
AI summary
A card reader for use with a card may include a card insertion part formed with an insertion port into which the card is inserted; and a magnetic head provided in the card insertion part and structured to contact with the card. A magnetic gap in a straight shape may be formed at a tip end of the magnetic head where the card is to be contacted. When a forming direction of the magnetic gap formed in the straight shape is a gap direction, the gap direction may be inclined with respect to a first direction perpendicular to an inserting direction of the card when viewed in a thickness direction of the card inserted into the insertion port.