Iridescent Security Film Angle-Dependent Authentication
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Solution Overview
Problem
Existing security documents lack a visible authentication mechanism that can be easily identified by the general public without the need for devices, while maintaining a high level of security through angle-dependent iridescent effects.
Innovation Solution
A security sheet with an iridescent security mark that is visible under normal observation and exhibits a color change only when viewed obliquely, utilizing iridescent pigments that are almost imperceptible under normal conditions, combined with a dye to ensure visibility under oblique angles, and optionally including fluorescent compounds and tactile effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iridescent pigments are used that are invisible under direct observation to maintain security, then security level is improved, but ease of detection by the general public deteriorates
Solution Approach 1:
The patent applies color change principles by using iridescent pigments that display different colors under direct observation versus oblique observation. The pigments appear colored under direct observation (making the mark visible to the general public) but show iridescent effects only under oblique observation (maintaining security). This color state change based on viewing angle resolves the contradiction between visibility and security.
Solution Approach 2:
The patent changes the parameter of observation angle to control the visibility of the iridescent effect. By specifying that the iridescent effect is visible only under oblique observation (at angles other than 90 degrees to the surface), the patent enables the same pigment to serve dual purposes: being visible under normal conditions while maintaining security through angle-dependent properties.
2Difficulty of detecting and measuring
If iridescent pigments are made visible under normal observation to improve ease of detection, then ease of detection is improved, but security level deteriorates
Solution Approach 1:
The patent uses color change properties of iridescent pigments to differentiate between normal observation and oblique observation states. The pigments are formulated to appear colored under direct observation (improving detectability) while displaying iridescent effects only under oblique observation (maintaining security). This conditional color expression resolves the contradiction.
Solution Approach 2:
The patent introduces the parameter of observation angle as a control mechanism. By specifying that iridescent effects are visible only under oblique observation conditions, the patent enables the security feature to be easily detectable under normal conditions while maintaining its security function under specific viewing angles.
3Reliability
If multiple zones with different iridescent pigments are used to improve security through angle-dependent effects, then security level is improved, but device complexity deteriorates
Solution Approach 1:
The patent applies local quality by creating different zones with distinct iridescent pigment compositions within the security mark. Each zone contains pigments with specific color and iridescent properties, creating spatial variation in optical characteristics. This localized differentiation enhances security while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent uses composite materials by combining different iridescent pigments with dyes in various zones. The composite formulation of pigments and dyes creates zones with specific optical properties that are visible under normal observation while maintaining iridescent effects under oblique observation, achieving enhanced security without excessive structural complexity.
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
Enhances public accessibility to authentication while maintaining a high security level by ensuring the iridescent effects are visible only when observed at specific angles, preventing unauthorized duplication and providing a visible authentication method without the need for devices.
Implementation Method 1
iridescent pigments that are almost colorless under normal observation and presenting an iridescent effect visible only when observed obliquely
Implementation Method 2
pigments iridescents which allow a document to be authenticated by their interference effect which creates a change of colors observable from certain angles
Implementation Method 3
The area is made perceptible under normal observation by the fact that it is colored
Implementation Method 4
substances reacting to certain stimulations giving a light response to the human eye, in particular fluorescent substances (reacting to UV rays)
Data Source
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Figure 7~10
AI summary
The invention relates to a security film (1) comprising a security mark (2) that can be observed on the surface of the film (1) and has at least one area (2a, 2b) having an iridescent effect. Said area is coloured under normal observation with the naked eye and has quasi-colourless iridescent pigments under normal observation and an iridescent effect which is visible only under oblique observation.