Alloy Absorbing Layer for Fabry-Perot Anti-Counterfeiting Films
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Solution Overview
Problem
Existing optically variable films struggle to achieve high color saturation while effectively hollowing out patterns, as traditional materials like chromium resist corrosion and result in low color saturation when aluminum is used, compromising anti-counterfeiting effectiveness.
Innovation Solution
The use of an alloy as the absorbing layer in a Fabry-Perot filter structure, specifically combining metals like aluminum and chromium, allows for complete hollowing of the optically variable film while maintaining high color saturation, addressing the contradiction between color saturation and hollowing in prior art.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chromium absorbing layer is used in Fabry-Perot filter structure, then the optically variable film can be formed with stable structure, but the chromium layer resists corrosion and cannot be completely hollowed out, resulting in gray black appearance and reduced hollowing effect
Solution Approach 1:
The patent uses composite absorbing layer structure combining aluminum and chromium layers. The aluminum layer (5-15 nm) provides corrosion susceptibility for complete hollowing, while the chromium layer (2-10 nm) provides structural stability. This composite structure resolves the contradiction between ease of hollowing and structural stability.
Solution Approach 2:
The patent optimizes the thickness parameters of aluminum and chromium layers in the absorbing layer. By controlling the aluminum layer thickness to 5-15 nm and chromium layer thickness to 2-10 nm, the film achieves both complete hollowing capability and sufficient structural stability, resolving the contradiction through precise parameter control.
2Ease of manufacture
If aluminum is used as absorbing layer to enable complete hollowing, then the hollowing effect is improved, but the refractive index is far smaller than extinction coefficient, resulting in low color saturation and reduced anti-counterfeiting effect
Solution Approach 1:
The patent combines aluminum and chromium in the absorbing layer to achieve both complete hollowing and high color saturation. The aluminum layer enables complete corrosion and hollowing, while the chromium layer contributes to color saturation, resolving the contradiction between hollowing capability and color quality.
Solution Approach 2:
The patent optimizes the thickness ratio and material composition of aluminum and chromium layers to achieve the best balance between hollowing effect and color saturation. By adjusting these parameters within specific ranges, both hollowing completeness and color vibrancy are maximized.
3Manufacturing precision
If aluminum-absorbing layer is used, then complete hollowing can be achieved, but the color saturation is low and anti-counterfeiting effect is reduced
Solution Approach 1:
The patent uses a composite absorbing layer with aluminum and chromium where aluminum (5-15 nm) ensures complete hollowing while chromium (2-10 nm) enhances color saturation. This composite approach simultaneously achieves both hollowing completeness and vibrant color for effective anti-counterfeiting.
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
This approach enables the realization of high color saturation and accurate hollowing, enhancing the anti-counterfeiting effect by ensuring vivid colors and precise pattern expression, even when observed through a transparent substrate.
Implementation Method 1
The color changes of the anti-counterfeiting element may be realized through the optical principle, that is, when the optical anti-counterfeiting element is inclined, the color of the optical anti-counterfeiting element changes along with the change of a viewing angle
Implementation Method 2
The principle of a Fabry-Perot interferometer may also be adopted, the structure of 'absorbing layer/dielectric layer/reflecting layer' is adopted, and an optically variable plating layer with the colors changing along with the change of the viewing angle is formed
Data Source
AI summary
The disclose provides an optical anti-counterfeiting element and a manufacturing method of the optical anti-counterfeiting element, the optical anti-counterfeiting element includes: a substrate, the substrate has a first surface and a second surface which are opposite to each other; and an interference color layer located on the first surface of the substrate, the interference color layer is located in a non-hollow area of the optical anti-counterfeiting element and is not located in a hollow area, the interference color layer is a Fabry-Perot filter structure, an absorbing layer of the Fabry-Perot filter structure is in contact with the substrate, and a material of the absorbing layer is an alloy.