Patterned Interference Film for Forgery Prevention
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Solution Overview
Problem
Current forgery prevention structures using optical elements like holograms face challenges in achieving high security and design excellence, particularly in providing vivid color tones and precise pattern alignment, while being cost-effective and productive, due to limitations in manufacturing methods and material reflectance.
Innovation Solution
A forgery prevention structure comprising a relief forming layer, a first reflection layer, a functional thin film layer, a second reflection layer, and a protection layer, where the second reflection layer is selectively patterned and colored, allowing for interference and color change with view angles, and avoiding positional misalignment through precise patterning and etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-intensity ink layer is used to provide vivid color tones, then color tone variety is improved, but reflectance decreases and light scattering increases
Solution Approach 1:
The patent combines high-intensity ink layers with vapor-deposited aluminum reflection layers to create a composite structure. The ink provides vivid color tones while the aluminum layer compensates for reflectance loss and reduces light scattering, achieving both color variety and high reflectance simultaneously
Solution Approach 2:
The patent applies different materials to different regions: high-intensity ink is applied only to specific pattern areas where vivid color is needed, while other areas use transparent or white base layers with aluminum reflection layers, optimizing both color vividness and overall reflectance
2Illumination intensity
If a partially colored reflection layer is created by overprinting high-luminance ink over a colored layer, then color variety is improved, but positional accuracy deteriorates
Solution Approach 1:
The patent pre-forms the colored layer and relief structure on the base film before applying the high-luminance ink pattern. This preliminary structuring provides alignment references that enable precise positional registration during the subsequent ink application process
Solution Approach 2:
The patent introduces a transparent or white base layer as an intermediary between the colored layer and the high-luminance ink. This intermediary layer provides a uniform substrate that improves ink adhesion and enables more accurate positional alignment during overprinting
3Illumination intensity
If a precious-metal reflection layer is formed by vacuum deposition or sputtering and then etched, then vivid color tone is improved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent replaces expensive precious-metal reflection layers with aluminum vapor-deposited films that are applied to the entire surface and then selectively removed by etching in pattern areas. This approach uses inexpensive materials and simplifies the manufacturing process while achieving the desired optical effects
Solution Approach 2:
The patent segments the reflection layer into patterned areas (where aluminum is removed) and non-patterned areas (where aluminum remains). This segmentation is achieved through etching processes that are more efficient than forming precious-metal layers, improving both productivity and cost-effectiveness
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 structure achieves a high forgery prevention effect with distinct color tones between areas, enhancing design and security while maintaining cost-effectiveness and productivity by utilizing a three-layer interference film with precise layering and patterning techniques.
Implementation Method 1
A colored reflection layer is obtained which makes three layers of the first reflection layer 3, the functional thin film layer 4, and the second reflection layer 5 interfere in at least a partial range of visible light
Implementation Method 2
The relief structure 7 has an effect of diffracting, scattering, absorbing, and polarizing/separating at least a part of a wave-length range of visible light
Implementation Method 3
The relief structure 7 has an effect of diffracting, scattering, absorbing, and polarizing/separating at least a part of a wave-length range of visible light
Implementation Method 4
The relief structure 7 has an effect of diffracting, scattering, absorbing, and polarizing/separating at least a part of a wave-length range of visible light
Implementation Method 5
a vapor-deposited film of aluminum and has a tendency to scatter. Therefore, there is a defect that a colored metallic luster, e.g., a metal luster of a vivid color tone such as gold or copper is not obtained
Data Source
Figure 1~2C
Figure 3~5
Figure 6~7B
AI summary
A forgery prevention structure (41) comprises a relief forming layer (42), a first reflection layer (43), a functional thin film layer (44), a second reflection layer (45), and a protection layer (46), which are layered in this order. The relief forming layer (42) has, on one side, a relief structure comprising a first relief (47) and a second relief (48), with a micro uneven pattern which perform an effect of diffracting, scattering, absorbing, and polarizing/separating a wavelength range of at least a part of visible light. A surface of the first relief has a smaller uneven surface area in comparison with a surface of the second relief. The first reflection layer and the functional thin film layer are provided along the uneven surfaces of the first and second reliefs of the relief structure. The second reflection layer and the protection layer are provided so as to cover only a surface of the functional thin film layer of the first relief.