Hidden Magnetic Stripe Card Coating for ISO-Compliant Encoding
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Solution Overview
Problem
Existing methods for hiding magnetic stripes on cards fail to meet ISO standards due to signal attenuation and difficulty in encoding/decoding, especially when using additional layers to conceal the stripe.
Innovation Solution
A personalized medium with a high-coercivity magnetic stripe and an opaque silk-screening layer containing iron tetroxide, combined with silver and white solvent inks, is used to hide the stripe while maintaining magnetic performance, with a total thickness of less than 10 micrometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If additional layers of materials are used to hide the magnetic stripe, then the magnetic stripe is hidden from view, but the card attenuates signals and fails to read or encode information
Solution Approach 1:
The patent changes the optical parameters of the silk-screening layer by using iron tetroxide pigment, which provides opacity to hide the magnetic stripe while maintaining magnetic signal transmission. This specific parameter change allows the layer to fulfill both hiding and signal transmission functions simultaneously
Solution Approach 2:
The patent uses a composite silk-screening layer containing iron tetroxide pigment combined with binding agents and solvents. This composite material provides both the hiding function (through opacity) and the signal transmission function (through magnetic properties), resolving the contradiction between concealment and functionality
2Ease of manufacture
If additional layers of materials are used to hide the magnetic stripe, then the magnetic stripe is hidden from view, but the card fails to meet international standards such as ISO
Solution Approach 1:
The patent carefully controls the thickness parameter of the silk-screening layer to be between 5-20 micrometers, which is sufficient to hide the magnetic stripe visually but thin enough to maintain magnetic signal strength and ISO compliance. This precise parameter control resolves the contradiction between hiding and standard compliance
3Ease of manufacture
If overprinting techniques are used to hide the magnetic stripe, then the magnetic stripe is hidden from view, but encoding and reading of the magnetic stripe becomes difficult
Solution Approach 1:
The silk-screening layer acts as an intermediary that selectively blocks visual light while allowing magnetic field penetration. The iron tetroxide pigment in the layer provides magnetic permeability that enables the magnetic stripe to remain functional for encoding and reading while simultaneously providing visual concealment
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 solution ensures compliance with ISO specifications and effective encoding/decoding, while providing a visually appealing design by hiding the magnetic stripe.
Implementation Method 1
an opaque silk-screening layer above the magnetic stripe that hides the magnetic stripe from view, where the silk-screening layer comprises iron tetroxide
Implementation Method 2
a magnetic stripe on the core layer... which can be read using a magnetic stripe reader
Data Source
AI summary
Provided is a hidden magnetic stripe card and method of personalization, which comprises a personalized medium that includes at least a core layer, a magnetic stripe on the core layer, and an opaque silk-screening layer above the magnetic stripe that hides the magnetic stripe from view, where the silk-screening layer comprises iron tetroxide combined with ink. In some embodiments, the iron tetroxide comes in the form of a paste or powder having low granulometry. Other embodiments are disclosed.