Pigmented Lacquer Film Diffractive Relief Latent Security
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Solution Overview
Problem
Existing films with diffractive relief structures and metallic or non-metallic reflection layers are too noticeable and distracting, making them unsuitable for applications like vehicle license plates, vehicle interiors, and valuable documents where a subtle security feature is needed.
Innovation Solution
A film with a pigmented colored lacquer layer instead of a metallic or non-metallic inorganic reflection layer, which produces a latent optically variable effect only visible under closer inspection or specific lighting conditions, maintaining a conventional appearance at normal distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic or non-metallic inorganic reflection layer is used to maximize the optically variable effect, then the security feature becomes highly visible and distracting, but this makes the film unsuitable for applications like license plates and vehicle interiors where subtlety is needed
Solution Approach 1:
The patent applies local quality by making the optically variable effect location-dependent and condition-dependent. The diffractive relief structure is present throughout the film, but the optically variable effect is localized to specific viewing conditions (close inspection, specific angles, or illuminated areas), while other areas maintain a conventional appearance. This allows the security feature to be visible where needed without causing general visual distraction.
Solution Approach 2:
The patent changes the optical parameters of the film by using a pigmented colored lacquer layer instead of a metallic or non-metallic inorganic reflection layer. This parameter change transforms the film's optical properties from highly reflective and visibly variable to subtly reflective with latent optically variable effects that only manifest under specific conditions, thereby reducing visual distraction while maintaining security functionality.
2Reliability
If the optically variable effect is made more noticeable to enhance security, then the film becomes too distracting for normal viewing, but reducing the effect makes it easier to counterfeit
Solution Approach 1:
The patent applies dynamics by making the optically variable effect condition-dependent rather than static. The effect dynamically appears or disappears based on viewing conditions such as inspection distance, viewing angle, or illumination. Under normal viewing conditions, the film appears conventional and comfortable, but under inspection conditions (close viewing, specific angles, or illuminated areas), the optically variable effect emerges to provide anti-counterfeit protection.
3Object-affected harmful factors
If a pigmented colored lacquer layer is used instead of a reflection layer, then the optically variable effect becomes latent and less noticeable, but this reduces the traditional security feature visibility
Solution Approach 1:
The patent applies preliminary action by incorporating the diffractive relief structure into the pigmented colored lacquer layer during the manufacturing process. The structure is pre-formed within the lacquer layer, ensuring that the latent optically variable effect is inherently present and will automatically manifest under appropriate inspection conditions without requiring additional application steps or activation procedures.
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 film provides enhanced security against forgery and decorative appeal with a subtle, non-distracting optically variable effect that is only recognizable upon closer inspection or under suitable illumination, maintaining the appearance of the coated article.
Implementation Method 1
The film (1) comprises at least one transparent replication layer (2) with a diffractive relief structure (3) and a pigmented colored lacquer layer (4)... an optically variable effect generated by the diffractive relief structure
Data Source
Figure 1
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AI summary
The invention relates to a film (1) comprising at least one transparent replicating layer (2) with a diffractive relief structure (3) and a reflective layer, wherein the reflective layer is formed by at least one pigmented color lacquer layer (4), and wherein the film (1, 1', 1'') exhibits a latent optically variable effect generated by the diffractive relief structure (3), and to its use. The invention further relates to a method for producing such a film.