Scattering Optical Security Component for Reliable Image Authentication

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Solution Overview

Problem

Existing optical security components, such as holograms, are difficult to authenticate reliably using ordinary or high-resolution image acquisition devices, especially for non-expert operators, due to angular selectivity of diffracting effects, and are not compatible with large-volume fabrication methods used for holographic components.

Innovation Solution

An optical security component with a reflective layer featuring microstructures distributed uniformly and modulated in height according to a random function, forming a scattering optical structure that produces a high-resolution image identifiable by reflection, compatible with fabrication methods for holographic components, allowing easy authentication using image acquisition devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If diffractive optical structures (holograms) are used for security authentication, then authentication with the naked eye is excellent, but reliable automatic authentication using image acquisition devices is difficult

Engineering Contradiction:

Improveauthentication accuracyVSAvoiddetection difficulty by image acquisition device

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent changes the fundamental optical parameter from diffraction to scattering. The microstructures are designed with random height distributions that scatter light in multiple directions, creating images that can be captured by ordinary image acquisition devices without angular selectivity constraints, thereby enabling automatic authentication while maintaining visual authentication quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the diffractive optical mechanism with a scattering-based optical mechanism. Instead of using periodic microstructures that diffract light, the invention uses random microstructures that scatter light, substituting one optical phenomenon for another to achieve compatibility with digital image capture systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If high-resolution image acquisition apparatus is used to capture hologram details, then more detail information is obtained, but it remains difficult to obtain a utilizable snapshot due to angular selectivity

Engineering Contradiction:

Improveimage resolutionVSAvoidease of capturing usable image

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent changes the angular response parameter from highly selective (diffraction) to broad (scattering). The scattering microstructures illuminate a wide angular range, allowing images to be captured from various angles using ordinary devices, making the system easy to operate without requiring precise angular alignment or specialized high-resolution equipment

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If ordinary printing techniques are used for security marking, then fabrication is simple, but fabrication in large volumes according to holographic methods is not compatible

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidlarge-volume fabrication capability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent changes the structural parameter of the optical element from periodic (holographic) to random (scattering). This random structure can be directly fabricated using conventional printing and deposition techniques, combining the simplicity of ordinary manufacturing with the capability for large-volume production, eliminating the need for complex holographic fabrication processes

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

Enables reliable and easy authentication of products with high-resolution images, overcoming angular sensitivity issues and facilitating production in large volumes, resulting in images of 'photographic' quality that can be identified by image acquisition devices.

Implementation Method 1

the said reflective layer exhibiting a zone structured with microstructures distributed spatially in a uniform manner over the whole of the zone so as to form an optical structure which is at least partially scattering in the said checking spectral band

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS9550390B2Optical security component, fabrication of such a component and secure product equipped with such a component

Publication Date: 2017.01.24 SURYS

AI summary

An optical security component intended to be checked in reflection in a checking spectral band includes a layer that is reflective in the checking spectral band. The layer exhibits a structured zone that includes microstructures distributed spatially in a uniform manner over a whole of the structured zone so as to form an optical structure that is at least partially scattering in the checking spectral band. The microstructures have heights that are distributed according to a random function, modulated over the structured zone by a modulation function so as to form, after illumination of the optical security component at a given angle, an image identifiable by observation in reflection.