Retroreflective Screen Microrecess Structure for Angle-Controlled Reflection
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Solution Overview
Problem
Existing retroreflective screens with cube corner microstructures have limitations in maximizing retroreflection efficiency and controlling the angle of incidence, particularly for applications requiring varied angles of incidence.
Innovation Solution
The microrecesses are designed in the form of truncated pyramids with specific dimensions and orientations to enhance retroreflection efficiency and control the angle of incidence, featuring a reflective metallization on lateral and back surfaces, and a transparent film with non-structured regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cube corner microstructures are used for retroreflection, then retroreflection efficiency is improved, but the ability to control angle of incidence is limited
Solution Approach 1:
The screen is divided into multiple zones, each containing microrecesses with different geometrical parameters (depth, aperture size, wall angles). This segmentation allows different zones to be optimized for different angles of incidence, thereby providing angle control capability while maintaining high retroreflection efficiency in each zone.
Solution Approach 2:
Each zone of the screen has locally optimized microrecess characteristics tailored to specific angular requirements. The microrecesses in different zones have different depths, aperture dimensions, and wall angles, creating local quality variations that enable the screen to handle varied angles of incidence effectively.
2Reliability
If microrecesses are coated with reflective metallization, then retroreflection efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The molding process that forms the microrecesses and the metallization deposition process are combined into a single integrated manufacturing step. The mold includes metallization layers already deposited on the microrecess surfaces, so that when the film is molded, the microrecesses are formed and metallized simultaneously, reducing manufacturing complexity.
Solution Approach 2:
The metallization layers are pre-deposited on the mold cavities before the film molding process. This preliminary action ensures that when the film is molded against the mold, the microrecesses are already metallized, eliminating the need for separate metallization steps and simplifying the overall manufacturing process.
3Illumination intensity
If the film is made transparent, then visibility through the screen is improved, but retroreflection performance may be compromised
Solution Approach 1:
The film has different optical properties in different regions: the microrecess areas contain metallization layers that provide retroreflection, while the non-structured regions remain transparent. This local quality differentiation allows the film to simultaneously achieve transparency for visibility and retroreflection performance for display.
Solution Approach 2:
The film surface is segmented into microrecess zones with metallization (for retroreflection) and non-structured transparent zones (for visibility). This segmentation allows light to pass through transparent regions while being retroreflected from metallized regions, achieving both transparency and retroreflection performance.
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 improved retroreflection efficiency at targeted angles of incidence while maintaining transparency and ease of manufacturing, allowing for varied angles of incidence to be addressed effectively.
Implementation Method 1
each microrecess having the shape of a truncated pyramid, the lateral walls and the back of each microrecess being coated with a reflective metallization
Implementation Method 2
reflective metallization
Implementation Method 3
the film is made of a transparent material
Data Source
AI summary
A retroreflective screen comprising including a film having a surface including a plurality of microrecesses, each microrecess having the shape of a truncated pyramid, the lateral walls and the back of each microrecess being coated with a reflective metallization.