Non-Contact Magnetic Reader for Security Document Quality Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring magnetic security features on security documents require the ink to dry, leading to delays and potential invalidation of banknotes if faults are detected after production, as they necessitate physical contact and cannot measure magnetic properties in liquid form, resulting in premature discarding of products.
Innovation Solution
A non-contact measurement system using a support module and magnetic reader module that maintains a gap between the reader and the security feature, allowing for contactless measurement of magnetic properties, enabling early fault detection and reducing mechanical stress and wear on the reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact measurement is used to measure magnetic security features, then measurement precision is improved, but the magnetic security feature is damaged due to physical contact and ink smudging
Solution Approach 1:
The patent replaces mechanical contact measurement with non-contact magnetic field measurement. The magnetic reader module detects magnetic properties through electromagnetic induction without physically touching the magnetic security feature, thereby eliminating ink smudging and physical damage while maintaining measurement precision.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the measurement system and the magnetic security feature. The magnetic reader module senses magnetic flux changes through the magnetic field without direct contact, allowing accurate measurement while preventing harmful physical interaction with the wet ink or delicate security feature.
2Measurement precision
If measurement is performed after ink drying, then measurement accuracy is improved, but production time is increased due to waiting for drying
Solution Approach 1:
The patent enables measurement to be performed before the ink is fully dried by using non-contact magnetic field detection. This preliminary measurement capability allows quality control to occur during the production process rather than after drying, significantly reducing production time while maintaining measurement accuracy through magnetic flux detection.
3Productivity
If the banknote is fed through the measurement system, then productivity is improved, but the risk of ink stains increases requiring the banknote to be dry
Solution Approach 1:
The patent replaces mechanical contact during measurement with non-contact magnetic field sensing. This allows banknotes to be fed through the measurement system at high speed without the magnetic reader module touching the ink, eliminating the risk of ink stains while maintaining high productivity through continuous measurement capability.
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 the measurement of magnetic properties before, during, and after production, preventing premature discarding of security documents, reducing mechanical load, and avoiding smudging of wet ink, thus allowing for early preventive measures and efficient quality control.
Implementation Method 1
the magnet sensor to measure the change in a magnetic property, such as the magnetic flux density
Data Source
Figure 1A~1C
Figure 1D
Figure 1E
AI summary
Apparatuses and methods for measuring magnetic properties of magnetic security feature are disclosed. Magnetic reader modules are movably coupled to support modules configured to guide the magnetic reader modules along a first direction. The magnetic reader modules are configured to perform contactless measurements of magnetic property changes induced as the magnetic reader modules move above said magnetic security features and generate an electrical signal in response to said measurements.