Multi-Tonal Security Feature Using Layered Substrate

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Solution Overview

Problem

Current security features in documents like banknotes are often too complex for the public to authenticate effectively, making them vulnerable to counterfeiting, as they require specialized inspection and may not provide a strong, easily recognizable effect.

Innovation Solution

A security feature comprising a substrate with two image layers, where a first image layer is applied with colored ink and a second semi-opaque layer with transparent or translucent regions overlaps with the first, creating a multi-tonal image visible in both reflection and transmission, enhancing public authentication and difficulty in reproduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If complex security features are used in banknotes, then security against counterfeiting is improved, but ease of public authentication deteriorates

Engineering Contradiction:

Improvesecurity against counterfeitingVSAvoidease of public authentication

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The security feature is segmented into multiple transparent layers, each containing a portion of the image. When viewed individually, each layer shows only part of the image, but when overlaid, they reconstruct the complete multi-tonal image. This segmentation makes counterfeiting difficult while allowing public authentication through simple visual inspection of the layered structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs color changes and tonal variations across multiple transparent layers. Each layer contains image portions with different tonal values, and when combined, they create a rich multi-tonal image. This color/tonal variation provides a strong visual effect that is easily recognizable by the public while being difficult to reproduce authentically.

Inventive Principle:

Principle #32Color changes

2Reliability

If multi-layer security features are implemented, then counterfeit resistance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecounterfeit resistanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple image layers into a single security feature structure. The layers are designed to be transparent and are positioned in registration with each other, combining to form a complete multi-tonal image. This merging approach achieves high counterfeit resistance while maintaining manufacturing efficiency by integrating the layers into one cohesive feature rather than requiring separate components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes parameter changes in the transparent layers, specifically varying the tonal values and image content of each layer. By controlling the optical parameters (transparency, tonal variation) of each layer, the system achieves complex security properties while the manufacturing process remains relatively simple, as the layers can be produced using standard printing techniques on transparent substrates.

Inventive Principle:

Principle #35Parameter changes

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 provides a secure, easily recognizable multi-tonal image that is challenging to counterfeit, engaging the public in authenticating documents and reducing counterfeiting costs, while being simpler and cost-effective to produce.

Implementation Method 1

a second image layer applied to the substrate, wherein the second image layer is a layer of semi-opaque material including transparent or translucent regions in which the semi-opaque material is omitted or reduced

Methodology Applied

Scientific EffectLight absorption and transmission: Absorption (EM radiation)