Infrared Security Document Structure for Anti-Counterfeit Verification
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Solution Overview
Problem
Existing documents such as passports and banknotes face challenges in having security features that are difficult to forge and verify, as common watermarks can be easily replicated by counterfeiters.
Innovation Solution
A document with a composite infrared security feature comprising a first substrate layer impregnated with an infrared-absorbing fluid and microperforations, and a second layer more transparent to infrared light, forming a distinctive pattern that can be verified using infrared imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common watermark is used as a security feature, then the document can be verified by a user under transmitted light, but the security feature can be easily replicated by counterfeiters
Solution Approach 1:
The patent transitions from conventional visible light watermarks to infrared-based security features. The first substrate layer absorbs infrared light while the second substrate layer transmits it, creating an infrared-only visible security feature that cannot be replicated by standard counterfeiting methods designed for visible light watermarks.
Solution Approach 2:
The security feature combines two different substrate layers with complementary infrared properties: a first substrate layer containing infrared-absorbing particles and a second substrate layer with infrared-transmitting properties. This composite structure creates the distinctive infrared pattern that serves as the security feature.
2Reliability
If a composite infrared security feature with multiple substrate layers is implemented, then the difficulty to counterfeit is significantly improved, but the device complexity and manufacturing process become more complex
Solution Approach 1:
The security feature is divided into two separate substrate layers, each with specific infrared properties. The first substrate layer handles infrared absorption while the second handles infrared transmission, allowing each layer to be manufactured and optimized independently before being combined.
Solution Approach 2:
The patent modifies the optical parameters of the substrate layers specifically for infrared radiation. By controlling the infrared absorption and transmission properties of each layer, the system creates a security feature that is invisible to the human eye in normal light but visible through infrared imaging.
3Reliability
If the first substrate layer is completely impregnated with infrared-absorbing fluid, then the infrared absorption characteristic is maximized, but the manufacturing precision requirements increase
Solution Approach 1:
The first substrate layer is impregnated with an infrared-absorbing fluid that penetrates the porous structure of the material. This allows uniform distribution of the absorbing particles throughout the substrate without requiring precise control of impregnation depth, as the porous structure naturally distributes the fluid evenly.
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 composite infrared security feature provides a difficult-to-counterfeit authentication method through characteristic IR transmission and absorption patterns, enabling efficient manual and automated verification.
Implementation Method 1
a first substrate layer region which is completely impregnated with an infrared-absorbing fluid
Implementation Method 2
the second substrate layer region is formed to be more transparent to infrared light than the infrared-absorbing fluid in order to allow incident infrared light to pass through to the first substrate layer region
Data Source
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AI summary
Document (100) with a security feature, comprising: a first substrate layer (103), wherein the first substrate layer (103) has a first substrate layer region (105) which is completely impregnated with an infrared-absorbing fluid, wherein the first substrate layer region (105) has microperforations (111a-c) which form a perforation pattern; a second substrate layer (107), wherein the second substrate layer (107) is arranged on the first substrate layer (103), wherein the second substrate layer (107) has a second substrate layer region (109), wherein the second substrate layer region (109) and the first substrate layer region (105) are aligned with each other, and wherein the second substrate layer region (109) is formed to be more transparent to infrared light than the infrared-absorbing fluid in order to allow incident infrared light to pass through to the first substrate layer region (105);and wherein the first substrate layer region (105) and the second substrate layer region (109) form a composite infrared security feature.;