Retroreflective Body with Colored Optical Effects
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Solution Overview
Problem
Current retro-reflective materials for vehicle number plates and traffic signs face challenges in maintaining high visibility under varying conditions, especially for older drivers and in urban environments with increased ambient brightness, and require advanced reflective layers and secure authentication features that are cost-effective and simple to manufacture.
Innovation Solution
A retro-reflective body with a substrate having a binder layer embedding transparent elements with spherical segments oriented towards the surface, where a portion of these elements are adjacent to spaces filled with an optically thinner medium, creating a distinct optically perceptible feature that enhances reflective effects and security through colored, oblique illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional retro-reflective films with glass spheres or micro-prisms are used, then high reflective values are achieved, but the visual acuity requirements for older drivers and recognition in urban ambient brightness are insufficient
Solution Approach 1:
The patent applies different reflective structures to different regions of the film: a first region with glass spheres for high retro-reflection and a second region with micro-prisms for directional reflection. This local differentiation allows the film to meet various visibility requirements simultaneously, improving overall reliability under different viewing and lighting conditions.
Solution Approach 2:
The patent combines two different retro-reflective mechanisms (glass spheres and micro-prisms) into a single composite film structure. This composite approach leverages the strengths of both technologies to achieve superior performance across multiple conditions, addressing the insufficiency of single-technology films for older drivers and urban environments.
2Reliability
If security features such as watermarks or holograms are applied to prove authenticity, then reliable authentication is achieved, but the manufacturing effort and cost increase significantly
Solution Approach 1:
The patent merges the security feature directly into the retro-reflective film structure by forming optically perceptible characters or patterns through the spatial arrangement of micro-prisms or glass spheres within the binder layer. This integration eliminates the need for separate security feature application steps, significantly reducing manufacturing complexity while maintaining authentication reliability.
Solution Approach 2:
The patent utilizes optical effects such as color changes or iridescence produced by the micro-prism or glass sphere structures themselves to create security features. These optically perceptible features change appearance under different viewing angles or lighting conditions, providing reliable authentication without requiring additional manufacturing processes.
3Illumination intensity
If the reflective layer is made more intensive to meet future requirements, then high-performance retro-reflection is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the retro-reflective film into distinct functional regions with different reflective mechanisms (glass sphere region and micro-prism region). This segmentation allows each region to be optimized for specific performance requirements while maintaining overall manufacturability, avoiding the complexity that would result from uniformly intensifying the entire film structure.
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 enhanced visibility and security by creating pronounced, colored reflective effects that differentiate from standard regions, improving recognition and authenticity verification while being resistant to external influences.
Implementation Method 1
a transparent intermediate layer is provided between the reflective layer and the glass spheres, so that the spheres act as thick lenses and a light beam incident upon the sphere is refracted such that its focus is situated just behind the sphere, substantially on the reflective layer. Thus, light is more or less reflected back to the light source.
Implementation Method 2
an internal total reflection provides a largely loss-free reflection, so that very high reflective values are achieved by means of this effect. Due to the occurrence of this effect in the interior of a transparent body at the interface with a different, optically thinner medium, it is not necessary to separately provide or manufacture any mirror surfaces.
Data Source
AI summary
A retro-reflective body with an optically perceptible feature includes a substrate on whose upper side a binder layer is disposed. A plurality of transparent elements is at least partially embedded into the binder layer in such a way that light can enter the transparent elements. The surface of the transparent elements is configured as a spherical segment at least in some portions and wherein the spherical segments of the transparent elements are embedded into the binder layer and are orientated towards the upper side of the substrate. The retro-reflective body has a first partial region which a first share of the transparent elements, in each case with the spherical sections, is adjacent at least in some portions to spaces -filled with an optically thinner medium or a vacuum, wherein the optically perceptible feature is formed by the first partial region.