Optical Security Component with Integrated Microlenses
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Solution Overview
Problem
Existing optical security components with Moiré magnification effects face challenges in reproducibility during high-volume manufacturing and have limitations in thickness, leading to potential forgery and compatibility issues with DOVID-type components, along with strong contrast inversion in specular reflection affecting observer understanding.
Innovation Solution
An optical security component featuring a first layer of dielectric material and a second reflective layer with complementary cylindrical microlenses of different curvatures, arranged in a specific periodic structure to provide Moiré magnification and uninterrupted movement effects without contrast accidents in specular reflection, enhancing authentication and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-layer arrangement with microlenses, optical separator, and micro-images is used, then Moiré magnification effect is achieved, but manufacturing precision and reproducibility deteriorate due to very precise relative positioning requirements
Solution Approach 1:
The patent merges the microlens structure and micro-image support into a single integrated layer, eliminating the optical separator and reducing the system from three layers to two layers. This integration removes the critical alignment requirements between separate layers, thereby improving manufacturing precision and reproducibility while maintaining the Moiré magnification effect for authenticity verification.
Solution Approach 2:
The patent transitions from a three-dimensional stacked arrangement (microlenses layer, optical separator, micro-images layer) to a more compact two-dimensional integrated structure. By embedding the micro-images directly within or on the microlens layer, the patent reduces the thickness dimension while preserving the optical functionality, thus improving both manufacturability and resistance to manipulation.
2Length of moving object
If the optical security component thickness is reduced to a few tens of microns, then compatibility with DOVID-type components improves, but the component becomes more easily manipulated and reusable for counterfeiting
Solution Approach 1:
By merging the microlens and micro-image layers into a single integrated structure, the patent achieves a compact thickness of a few tens of microns, making it compatible with DOVID-type components. Simultaneously, the integrated design creates a more robust structure that is harder to manipulate and reuse for counterfeiting compared to separate layered structures.
Solution Approach 2:
The patent employs a composite structure combining microlens elements and micro-image patterns within a single layer, creating a multifunctional integrated component. This composite design achieves both thinness for DOVID compatibility and enhanced security against forgery through the complex integrated architecture that is difficult to replicate.
3Illumination intensity
If traditional Moiré magnification components are used, then magnification effect is achieved, but strong contrast inversion in specular reflection occurs affecting observer understanding
Solution Approach 1:
The patent applies different optical properties to different regions within the integrated layer. By locally optimizing the microlens and micro-image configurations, the patent reduces the strong contrast inversion effects in specular reflection that occur in traditional designs, thereby improving observer understanding while maintaining the Moiré magnification effect.
Solution Approach 2:
The patent designs the integrated microlens-micro-image structure to dynamically control light reflection and transmission. By optimizing the geometric and optical parameters of the integrated elements, the patent achieves smoother contrast transitions in specular reflection, eliminating the abrupt contrast inversion that disrupts observer understanding while preserving the magnification functionality.
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 improves reproducibility, handling, and authentication by providing stable, uninterrupted Moiré magnification and movement effects, reducing the risk of forgery and enhancing observer experience through controlled curvature and arrangement of microlenses and micro-images.
Implementation Method 1
the optical component presenting, in reflection and under the effect of a tilt movement around an axis perpendicular to said first direction, a magnification and a displacement of said first micro-images by Moiré magnification
Implementation Method 2
The curved external surfaces of the microstructures 27 reflect incident light according to the laws of reflection, in all directions (rays R1)
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
According to one aspect, the invention relates to an optical security component (301) intended to be observed in reflection, by the naked eye. It comprises a first layer (313) of dielectric material and a second reflective layer (314) forming a reflective interface with the first layer. The reflective interface comprises a first optical structure with first elementary surfaces (I1) and second elementary surfaces (I2). The first elementary surfaces (I1) follow the profile of a first one-dimensional array of first cylindrical microlenses identical to each other, arranged periodically in a first direction, with a first period. The second elementary surfaces (I2) follow the profile of a second one-dimensional array of second cylindrical microlenses identical to each other, superposed on said first array, the curvature of said second cylindrical microlenses being less than that of said first cylindrical microlenses. The first elementary surfaces (L) or the second elementary surfaces (I2) have contours that, when viewed from above, form identical and recognisable micro-images, arranged periodically in a second direction and with a second period, the optical component displaying, in reflection and upon being tilted about an axis perpendicular to said first direction, magnification and displacement of said first micro-images by moiré magnification.