Cube-Corner Retroreflective Sheet Boundary Design
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Solution Overview
Problem
Hexagonal cube-corner retroreflective sheeting has limitations in rotation angle characteristics and design, particularly due to conspicuous boundaries between regions with different orientation angles, leading to reduced brightness and inferior aesthetic quality.
Innovation Solution
The use of hexagonal cube-corner retroreflective elements with modified reflective lateral surfaces, such as pentagonal and quadrangular shapes, arranged in a closest-packed state to ensure retroreflectivity at boundaries, maintaining high brightness and concealing the boundaries between regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hexagonal cube-corner retroreflective elements are arranged in regions with different orientation angles to improve rotation angle characteristics, then rotation angle characteristics are improved, but boundaries between regions become conspicuous and brightness is reduced
Solution Approach 1:
The patent applies local quality by making the retroreflective elements at boundaries have different properties from those in the interior. Specifically, boundary elements have at least one reflective lateral surface with a different shape (pentagonal or quadrangular) compared to the hexagonal shape of interior elements. This local modification ensures that boundary elements can still effectively reflect light while accommodating the orientation changes between adjacent regions, thus maintaining brightness at boundaries while allowing different orientation angles in different regions to improve rotation angle characteristics.
2Adaptability or versatility
If hexagonal cube-corner retroreflective elements are arranged in regions with different orientation angles to improve rotation angle characteristics, then rotation angle characteristics are improved, but design quality is reduced due to conspicuous boundaries
Solution Approach 1:
The patent makes boundary retroreflective elements have different local properties (pentagonal or quadrangular reflective surfaces) to seamlessly connect regions with different orientations, preventing visible boundary lines and maintaining uniform appearance across the entire sheeting, thus preserving design quality while enabling improved rotation angle characteristics through multi-directional element arrangement.
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
This approach enhances rotation angle characteristics and design by maintaining high retroreflection efficiency and aesthetic quality across the sheeting, preventing brightness reduction and making boundaries less conspicuous.
Implementation Method 1
Hexagonal cube-corner retroreflective sheeting that is excellent in light reflective efficiency is known as one example of the retroreflective sheeting
Data Source
Figure 1A~2B
Figure 3A~4B
Figure 5A~6
AI summary
An object is to provide cube-corner retroreflective sheeting that is excellent in rotation angle characteristics and excellent in design. In cube-corner retroreflective sheeting 3, cube-corner retroreflective elements in at least two mutually adjacent regions A and B rotate with each other around an axis perpendicular to the sheeting, in which cube-corner retroreflective elements 11 and 12 not in contact with boundaries between the regions A and B are cube-corner retroreflective elements having a hexagonal shape, and cube-corner retroreflective elements 11s, 12s, 11t and 12t in contact with the boundaries between the regions A and B are cube-corner retroreflective elements having a shape obtained by cutting parts of one or two reflective lateral surfaces of the cube-corner retroreflective element having a hexagonal shape where the partly cut reflective lateral surfaces are in contact with the boundaries.