Optical Multilayer with Ordered and Disordered Microstructures
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Solution Overview
Problem
Current methods for authentication and anti-counterfeiting require additional equipment, which can be costly, and existing optical multilayers do not effectively differentiate appearance under different lighting conditions, limiting their visual appeal and functionality.
Innovation Solution
An optical multilayer with textured surfaces comprising regions of ordered and disordered optical microstructures, where the first region exhibits diffractive effects in directional light and minimal effects in diffuse light, utilizing layers with different refractive indices and microstructures of constant and non-constant periodicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional equipment is used for authentication, then authentication reliability is improved, but device complexity and cost increase
Solution Approach 1:
The optical multilayer structure enables self-authentication by inherently producing different visual appearances under directional versus diffuse lighting conditions. The structured surface itself serves as the authentication mechanism without requiring external equipment, making the system self-sufficient and eliminating the need for additional authentication devices
Solution Approach 2:
The patent utilizes color and appearance changes of the optical multilayer under different lighting conditions to provide authentication. The structured surface exhibits diffractive effects in directional light that create distinct visual patterns, while appearing uniform in diffuse light, enabling equipment-free visual authentication
2Ease of manufacture
If uniform texture is used on optical multilayer, then manufacturing simplicity is improved, but visual appeal and differentiation capability deteriorate
Solution Approach 1:
The patent applies different texture characteristics to different regions of the optical multilayer. Specifically, a first region contains optically active microstructures that produce diffractive effects, while a second region contains optically inactive microstructures that appear uniform. This local differentiation creates visually appealing and distinguishable features without significantly complicating the overall manufacturing process
3Reliability
If optically active microstructures are added to provide differentiation, then authentication capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the optical multilayer surface into distinct regions: a first region with optically active microstructures for authentication and a second region with optically inactive microstructures. This segmentation allows the authentication function to be localized to specific areas, reducing the overall structural complexity while maintaining strong authentication 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 easy authentication without additional equipment, provides a visually appealing effect, and effectively differentiates appearance under various lighting conditions, making it suitable for everyday use in security and anti-counterfeiting applications.
Implementation Method 1
the first region of the surface exhibits diffractive effects when viewed in directional light
Implementation Method 2
at least two thin layers of material having different refractive indices, such that selective wavelengths are transmitted and/or reflected
Data Source
AI summary
An optical multilayer (1) comprising textured surfaces suitable for use in anti- counterfeiting and/or security applications is described. The optical multilayer (1) comprises at least two textured layers, said layers having different refractive indices, wherein each of the textured layers comprise at least one first region (7), said first region (7) comprising optical microstructures of constant periodicity, and each of the textured layers comprise at least one second region (8), said second region (8) comprising optical microstructures which are disordered.