Identity Document Photosensitive Coating Radiation Transparency

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Solution Overview

Problem

Existing identity documents with secondary portraits face challenges such as the need for dedicated transparent zones, which restrict printing areas and weaken the document structure when using perforation methods.

Innovation Solution

A method involving a document structure with transparent external layers and a white central layer coated with a photosensitive opaque white coating, where specific points are made transparent using radiation to create a secondary portrait without dedicated zones or structural weakening, allowing for visible patterns under intense lighting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If a transparent window is used for the secondary portrait, then the secondary portrait can be displayed, but the printing surface area is reduced and the document structure is weakened

Engineering Contradiction:

Improvesecondary portrait visibilityVSAvoidprinting surface area

Core Design Contradiction:

Loss of informationVSArea of stationary object

Solution Approach 1:

The white central layer serves multiple functions: it provides a printing background for the overall document and simultaneously contains the secondary portrait information. The photosensitive coating on this layer can be selectively removed to reveal the secondary portrait, while the rest of the layer remains as a printing surface. This eliminates the need for a separate transparent window and maximizes the usable printing area.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the function of the transparent window with the white central layer. Instead of having a separate window structure, the secondary portrait is integrated directly into the white central layer through selective removal of the photosensitive coating. This combines the background printing function and the secondary portrait display function into a single layer structure.

Inventive Principle:

Principle #5Merging (Combining)

2Loss of information

If a transparent window is used for the secondary portrait, then the secondary portrait can be displayed, but the document structure is weakened

Engineering Contradiction:

Improvesecondary portrait visibilityVSAvoiddocument structural strength

Core Design Contradiction:

Loss of informationVSStrength

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention replaces the mechanical transparent window structure with a photosensitive coating removal system. Instead of physically cutting or inserting a window, the secondary portrait is created by selectively removing the photosensitive coating through radiation exposure. This eliminates the mechanical weakness associated with windows while maintaining the secondary portrait display function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Area of stationary object

If perforation is used to create the secondary portrait, then no dedicated zone is needed, but the document becomes mechanically weaker and prone to breakage

Engineering Contradiction:

Improveprinting surface areaVSAvoiddocument structural strength

Core Design Contradiction:

Area of stationary objectVSStrength

Solution Approach 1:

The invention replaces the mechanical perforation system with a photosensitive coating removal system. Instead of physically perforating the document layers, the secondary portrait is created by selectively removing the photosensitive coating through radiation exposure. This eliminates the mechanical weakness and breakage risk associated with perforation while maintaining the full surface area for printing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 the creation of a secondary portrait that is not visible under ambient lighting but visible when backlit, maintaining document strength and allowing for printing on the entire surface, enhancing authentication and security without mechanical weakness.

Implementation Method 1

a photosensitive opaque white coating, a step of exposing at least a point of the photosensitive opaque white coating to a first radiation, the radiation being able to perform ablation of the photosensitive opaque white coating, so that the point exposed to the radiation becomes transparent

Methodology Applied

Scientific EffectPhotosensitivity: Photochromism

Implementation Method 2

the radiation being able to perform ablation of the photosensitive opaque white coating

Methodology Applied

Scientific EffectAblation: Ablation

Implementation Method 3

the first radiation is a laser radiation close to UV radiation, with a wavelength in the range from 190 to 400 nm, or close to IR radiation, with a wavelength in the range from 700 to 2500 nm, or close to green radiation with a wavelength in the range from 500 nm to 550 nm

Methodology Applied

Scientific EffectLaser heating: Laser

Data Source

PatentUS20230382149A1Method for manufacturing an identity document, identity document and method for authenticating such an identity document

Publication Date: 2023.11.30 IDEMIA IDENTITY & SECURITY FRANCE SAS

AI summary

An identity document and method for manufacturing the identity document, the method including providing a document body that includes at least a first and a second transparent external layer and a white central layer, the white central layer including a transparent substrate at least partially covered with a photosensitive opaque white coating, and exposing at least a point of the photosensitive opaque white layer to a first radiation, the radiation being able to perform ablation of the photosensitive opaque white layer, so that the point exposed to the radiation becomes transparent, and so that light passes through the thickness of the identity document at that point.