Image-Wise Printed Security Features for Document Personalization
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Solution Overview
Problem
Existing security features for documents such as ID cards are not personalized, leading to high material costs and lack of individualization, while existing low-cost solutions do not meet durability and security requirements.
Innovation Solution
A thermal transfer sheet with a clear mass transfer panel and protective top coat is used to print image-wise security features, including a transparent layer pattern, which can be customized for each document, enhancing visibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pre-designed security laminates such as holographic patches are used, then security features are provided, but they are manufactured in large batches and not personalized or individualized for an individual document holder
Solution Approach 1:
The security feature is divided into a base layer and an image-wise pattern layer that can be separately manufactured and then combined. The image-wise pattern layer is created individually for each document using dye diffusion printing, while the base layer can be produced in batches, enabling both personalization and efficient manufacturing.
Solution Approach 2:
The base layer of the security feature is prepared in advance as a generic component that can be stored and applied later. This allows the personalized image-wise pattern to be printed and applied to the pre-prepared base layer at the point of document issuance, combining batch manufacturing efficiency with individual customization.
2Adaptability or versatility
If security ribbons containing mass transferrable optically variable pigments, UV fluorescing pigments, dyes are used, then security features are added at point of issuance, but material cost is high
Solution Approach 1:
The patent uses standard dye diffusion printing materials and common polymers instead of expensive specialized security ribbons. The security feature is created using economical, readily available materials that can be printed individually at point of issuance without requiring costly proprietary security materials.
Solution Approach 2:
The patent creates security features by changing the physical and optical parameters of common materials through image-wise printing. By varying dye concentration, layer thickness, and optical properties in specific patterns, sophisticated security features are generated using inexpensive base materials, eliminating the need for costly pre-formulated security ribbons.
3Quantity of substance
If standard printing materials are used for security features, then cost is reduced, but durability and security requirements are not met
Solution Approach 1:
The security feature consists of multiple layers including a base layer and an image-wise pattern layer with different optical and physical properties. This composite structure combines materials with complementary characteristics to achieve both durability and security functionality while maintaining cost-effectiveness through the use of standard printing materials.
Solution Approach 2:
The patent employs optical variable effects through image-wise dye diffusion printing, creating patterns that exhibit color changes and visual complexity. This provides security functionality through optical properties rather than relying on expensive specialized pigments, maintaining both security 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
Provides low-cost, individually tailored security features with improved durability and visibility, allowing for secure and convenient identity verification.
Implementation Method 1
Printing, such as dye diffusion thermal transfer printing (also known as D2T2 or 'dye-sublimation' printing) may be used to produce color images
Implementation Method 2
followed by transfer of a protective top coat
Data Source
AI summary
A visual security feature is provided that is disposed on a target. The visual security feature includes two substantially transparent layers. At least one of the two substantially transparent layers is present in an image-wise pattern.