Covert Label Diffracting Optical Element Authentication
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Solution Overview
Problem
Manufacturers face challenges in authenticating products and preventing counterfeit returns, as existing labeling methods are easily replicable and difficult to verify, leading to potential financial losses from false refunds.
Innovation Solution
A covert label structure incorporating a diffracting optical element layer and an overcoat layer that reflects light in a predetermined pattern, which can be authenticated using a handheld device or technology by projecting light at a specific wavelength and comparing the reflected pattern against a database, making it difficult to counterfeit and detect with the human eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional labeling methods are used for product identification, then the labeling process is simple and inexpensive, but the labels are easily replicated and difficult to verify, leading to high risk of counterfeit products
Solution Approach 1:
The label is divided into multiple functional layers: a base layer containing the diffracting optical element and an overcoat layer. This segmentation allows each layer to perform a specific function - the diffracting element creates the optical pattern while the overcoat protects it and adds opacity - making the overall system more reliable for authentication without requiring excessive complexity in any single component
Solution Approach 2:
The label utilizes changes in optical parameters - specifically the wavelength-dependent interaction with the diffracting optical element. Different wavelengths of light interact differently with the label structure, creating a characteristic reflection pattern that is difficult to replicate. This parameter-based authentication approach significantly improves reliability while maintaining reasonable structural complexity
2Reliability
If covert label structures with diffracting optical elements are used, then authentication reliability improves and counterfeiting becomes difficult, but the label becomes detectable and requires specialized authentication equipment
Solution Approach 1:
The overcoat layer is designed with wavelength-selective optical properties - it appears opaque at certain wavelengths while being transparent at others. This creates a visual effect where the label can appear invisible or normal under certain lighting conditions but reveals its authentication pattern when illuminated with the appropriate wavelength, thus improving counterfeit prevention while managing detectability
Solution Approach 2:
The overcoat layer acts as an intermediary between the diffracting optical element and the environment. It protects the delicate diffracting structure while controlling its visibility - the overcoat can be optimized to be transparent at the authentication wavelength while appearing opaque at visible wavelengths, thus mediating between the need for reliable authentication and the desire for label invisibility
3Object-affected harmful factors
If the overcoat layer is made opaque to visible light, then the diffracting optical element is protected and the label is invisible to the human eye, but light authentication requires specific wavelength transparency
Solution Approach 1:
The overcoat layer exhibits different optical properties at different wavelengths - it is opaque at visible wavelengths to protect the diffracting element from environmental damage and human detection, but transparent at the specific infrared or ultraviolet wavelength used for authentication. This local quality variation in the same material allows simultaneous achievement of protection and authenticated visibility
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 covert label structure enables quick and reliable product authentication, reducing the risk of counterfeit returns and associated financial losses, while being inexpensive to manufacture and difficult to replicate.
Implementation Method 1
a diffracting optical element layer that reflects light in a predetermined pattern
Implementation Method 2
an overcoat layer that is transparent to light at a particular wavelength of light and is opaque to other wavelengths of light
Data Source
AI summary
A covert label structure comprising a three dimensional diffracting optical element layer (100) having a depth profile for producing a predetermined pattern, wherein different portions of a top surface of the diffracting optical element layer (100) have at least two different depths relative to a bottom surface of the diffracting optical element layer (100), wherein the depth profile spans across two dimensions of the top surface of the diffracting optical element layer (100), and wherein the top surface reflects light according to the predefined pattern and an overcoat layer (108) over the top surface of the diffracting optical element layer (100) wherein the overcoat layer (108) is opaque to at least one wavelength of light.