Transparent Printed Security Features for Personalized ID Cards
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Solution Overview
Problem
Existing security features for documents such as ID cards are not personalized, are costly, and lack individualization, failing to meet the balance of cost, durability, security, and quality criteria.
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
1Reliability
If traditional security ribbons containing mass transferrable optically variable pigments, UV fluorescing pigments, or dyes are used, then security features are provided, but material cost increases significantly
Solution Approach 1:
The patent replaces expensive, specialized security ribbons with a disposable thermal transfer sheet containing ordinary polymer material and pigment. The sheet is consumed in the printing process, transferring the security feature image to the document substrate, thereby eliminating the need for costly reusable security ribbons while maintaining security functionality.
Solution Approach 2:
The patent changes the material parameter from specialized optically variable pigments and UV fluorescing materials to ordinary polymer material with pigment dispersed throughout. This parameter change reduces material cost while the security feature is enhanced through the clear material's ability to refract and reflect light, creating visual effects without requiring expensive specialized materials.
2Reliability
If pre-designed security laminates such as holographic patches are used, then security features are provided, but personalization capability is lost
Solution Approach 1:
The patent segments the security feature into an image-wise pattern that can be individually customized for each document. The thermal transfer sheet allows the security feature image to be divided into pixel or dot elements that can be selectively transferred to create personalized patterns, names, or designs specific to each document holder, unlike monolithic pre-designed laminates.
Solution Approach 2:
The patent introduces dynamic personalization capability where the security feature can be customized in real-time during the printing process. The thermal transfer sheet can be programmed to transfer different image patterns, text, or designs based on the specific document being produced, allowing the security feature to adapt and change for each individual document rather than using static pre-designed laminates.
3Reliability
If clear material is printed image-wise and followed by uniform top coat application, then durability and visibility are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines multiple functions into a single thermal transfer sheet: the clear polymer material provides both the image-wise security feature and serves as the protective top coat when applied uniformly. This merging of functions reduces manufacturing process complexity by eliminating the need for separate application steps for the security feature and protective coating, as both are transferred together in one printing operation.
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, ensuring the underlying image remains legible and the security feature is distinct, enhancing document verification.
Implementation Method 1
The clear material, when printed image-wise and followed by application of a uniform top coat, provides a visual effect
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.