Reflective Screen Flat Edge Adhesion Fresnel Lens
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Solution Overview
Problem
The existing reflective screens face issues with uneven surface adhesion due to the triangular cross-sectional shape of the lens layer, leading to inadequate bonding with the support plate and potential peeling apart.
Innovation Solution
The reflective screen features a lens layer with a Fresnel lens shape, where a flat part is formed at the edges, ensuring a flat surface for adhesion. This design improves the adhesion between the reflective screen and the support plate by maintaining flatness and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens layer with triangular cross-sectional shape is used to achieve Fresnel lens functionality, then light reflection and focusing performance is improved, but surface unevenness is created that prevents sufficient adhesion with the support plate
Solution Approach 1:
The lens layer is segmented into two distinct regions: a lens portion with triangular cross-section for optical functionality, and a flat portion at the edge with zero lens height for adhesion. This segmentation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the lens layer are given different local qualities: the lens portion has the triangular shape optimized for light reflection, while the flat portion at the edge has a flat surface specifically designed for adhesion with the support plate. This local differentiation resolves the contradiction between optical performance and adhesion.
2Illumination intensity
If the lens layer is made with convex shape towards the back surface to achieve Fresnel lens effect, then video light reflection is enhanced, but the junction layer surface becomes uneven causing peeling
Solution Approach 1:
The lens layer is divided into a lens portion that is convex towards the back surface for light reflection, and a flat portion at the edge that is flat to ensure stable adhesion. This segmentation maintains both optical functionality and structural stability.
Solution Approach 2:
The lens layer exhibits local quality variation: the lens portion has convex shape for optical performance, while the flat portion at the edge has a flat surface for stable bonding. This local differentiation resolves the contradiction between light reflection enhancement and structural stability.
3Illumination intensity
If the lens height is increased to improve Fresnel lens performance, then light focusing ability is enhanced, but the unevenness of the back surface increases making adhesion difficult
Solution Approach 1:
The lens layer is segmented such that the lens portion can have large lens height for light focusing, while the flat portion at the edge maintains zero lens height and a flat surface for precise adhesion. This segmentation allows independent optimization of both parameters.
Solution Approach 2:
Different regions have different local qualities: the lens portion has high lens height for light focusing ability, while the flat portion at the edge has a flat surface with precise dimensional control for adhesion. This local differentiation resolves the contradiction between light focusing and surface flatness.
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 improved adhesion between the reflective screen and the support plate enhances the stability and durability of the reflective screen unit, effectively preventing peeling and ensuring reliable video display.
Implementation Method 1
a reflective layer (12) which is formed on the unit lens of the lens layer, and reflects light
Implementation Method 2
a lens layer (11) of Fresnel lens shape in which a plurality of unit lenses (111) are arranged
Data Source
AI summary
A reflective screen including a Fresnel lens-shaped lens layer having unit lenses and a reflective layer formed on the unit lenses for reflecting light. The unit lens protrudes from a video source side to a back surface side in the thickness direction of the lens layer. In the lens layer, a flat part having a flat surface f on the back surface side is formed at at least one end edge. In the thickness direction of the lens layer, a maximum lens height h1max of a lens height h1 that is the distance from a position closest to the video source side to a position closest to the back surface side, and a flat surface height h2 that is the distance from the position closest to the video source side of the unit lens to the flat surface f of the flat part 114 satisfy h2≥h1max.