Retroreflective Sheeting with Lenticular Tamper Evidence
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Solution Overview
Problem
Existing retroreflective sheeting technologies do not effectively incorporate printed images or utilize stereoscopic images for tamper prevention in applications such as number plates and certification stickers.
Innovation Solution
Incorporating a light-transmissive optical element array sheet with retroreflective sheeting, where a latent image formed through specific halftone printing is used, allowing the formation of a stereoscopic image that changes with the relative position of the optical element array sheet, thereby enhancing tamper prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If retroreflective sheeting is used for signs and number plates, then visibility and retroreflection performance are improved, but susceptibility to tampering increases
Solution Approach 1:
A latent image is pre-printed on the retroreflective sheeting before use. This latent image remains invisible or indistinct until the sheeting is tampered with or viewed under specific conditions, at which point the tamper evidence becomes apparent. This preliminary preparation enables detection of unauthorized modifications.
Solution Approach 2:
The patent employs optical elements (such as lenticular lenses or prism arrays) that create variable color or intensity effects when viewed from different angles. The retroreflective sheeting incorporates these optical elements in a pattern that produces a specific visual effect, which changes or disappears when the sheeting is tampered with, providing visual evidence of tampering.
2Illumination intensity
If printed images are incorporated into retroreflective sheeting, then design quality and visual effect are improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the printed image layer with the retroreflective elements and optical elements into a single integrated sheeting structure. The printed image is applied directly to the retroreflective substrate, and the optical elements are embedded or laminated in a way that creates a unified component, simplifying manufacturing and assembly.
Solution Approach 2:
The retroreflective sheeting serves multiple functions simultaneously: it provides retroreflection for visibility, displays printed images for design and information, and incorporates optical elements for enhanced visual effects and tamper evidence. This multi-functionality is achieved through an integrated structure that combines these features in a single manufacturable product.
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 tamper prevention effect by rendering the latent image visible only when the optical element array sheet is laminated, making it difficult to tamper with the retroreflective sheeting used in number plates and certification stickers.
Implementation Method 1
a lenticular lens sheet is used as the optical element array sheet... when the printed image is seen through the optical element array sheet, a variable image, which varies according to the relative position of the optical element array sheet to the retroreflective sheeting, is formed
Implementation Method 2
retroreflective sheeting which retroreflects light
Data Source
AI summary
This invention provides a retroreflective sheeting which at least comprises a printed image-incorporated retroreflective sheeting and an optical element array sheet in which a large number of light-transmissive optical elements are regularly disposed at least at a fixed location; more particularly a printed image-incorporated retroreflective sheeting which reveals a stereoscopic image when the printed image is seen through a lenticular lens sheet or a convex lens array sheet; and a reflective sheeting which uses the stereoscopic image for tamper prevention.