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Solution Overview
Problem
Existing security documents, such as banknotes, face challenges in providing durable tactile features for visually impaired users, as these features are prone to damage from handling and sorting machines, and lack effective visual contrast to distinguish denominations, especially in environments with improving photocopier technology.
Innovation Solution
Incorporating a substantially opaque region with a substantially transparent peripheral region on banknotes, which provides high visual contrast and is difficult to reproduce, allowing partially sighted users to identify the banknotes and preventing counterfeiting, while also enabling banknote sorters to differentiate between denominations based on unique transparent region shapes and locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tactile features are added to assist visually impaired users, then accessibility is improved, but durability deteriorates due to damage from handling and sorting machines
Solution Approach 1:
The patent applies different optical properties to different regions of the banknote - the peripheral region is made substantially transparent while the central region remains opaque. This local differentiation creates high visual contrast that is easily detectable by partially sighted users without requiring durable tactile features that would be damaged by handling.
2Ease of manufacture
If traditional opaque banknotes are used, then manufacturing is simple, but visual contrast for denomination identification deteriorates, especially against photocopied counterfeits
Solution Approach 1:
The patent applies the principle of optical property changes by making the peripheral region substantially transparent while keeping the central region opaque. This creates a distinctive visual appearance that is difficult to reproduce with standard photocopiers, thereby improving security and denomination identification while maintaining manufacturing feasibility.
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 solution enhances the durability of tactile features, provides effective visual contrast for identification by partially sighted individuals, and aids in distinguishing banknote denominations, while preventing counterfeiting and improving sorting efficiency.
Implementation Method 1
a substantially transparent peripheral region... providing excellent contrast between the transparent and opaque regions provided thereupon enabling partially-sighted users to perceive the distinctive shape of the opaque region silhouetted against the light background visible through the transparent periphery
Data Source
Figure 1a~1d
Figure 2a~2d
Figure 3a~4
AI summary
A banknote which is one of a series of banknotes of different denominations, the banknote comprising a polymer substrate (1) having a substantially opaque region (2A-2D) defining or carrying indicia relating to the banknote, and a substantially transparent peripheral region (3A-3D) wherein the substantially opaque central region has a shape unique to the denomination of the banknote.