Diffusing Microstructure for Secure Product Readability
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Solution Overview
Problem
Optically variable security elements in secure products, such as security documents, hinder machine and human readability due to high specular reflection, making it difficult to read variable data while maintaining protection against counterfeiting and forgery.
Innovation Solution
Incorporating a diffusing microstructure on the internal surface of a transparent layer within the secure product, which reduces specular reflection and enhances readability by dispersing light, allowing readable information to be clearly visible to both machines and the naked eye without compromising security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective layer is added to protect variable data with optically variable elements, then protection against counterfeiting and forgery is improved, but readability of variable data by machines and the naked eye deteriorates due to high specular reflection
Solution Approach 1:
The patent applies local quality by creating a heterogeneous surface structure on the reflective layer where micro-irregularities are distributed across the surface. This allows different regions to have different optical properties - some areas maintain specular reflection for security while others provide diffuse reflection for readability, resolving the contradiction between protection and readability
Solution Approach 2:
The patent introduces an intermediary layer or surface treatment between the reflective layer and the readable information. This intermediary structure (micro-irregularities) mediates the optical interaction by scattering light in a controlled manner, allowing both the reflective security function and the readable information function to coexist without fully compromising either
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 diffusing microstructure improves readability by reducing specular reflection by 20-80%, enabling clear reading of information in secure products while maintaining resistance to counterfeiting and forgery, without increasing production costs.
Implementation Method 1
a diffusing microstructure positioned on a first part of an internal surface of the second layer... reduces specular reflection by 20-80%... dispersing light
Data Source
AI summary
A secure product, and a production method, comprising a first reflective layer, a second layer and a third layer including readable information, the first layer being enclosed between the second and the third layers, in which the first and second layers are transparent, at least a first part of the internal surface of the second layer comprises a diffusing microstructure, and the diffusing microstructure is positioned so as to cover a predetermined part of the readable information.