Radio-wave transparent cover with protrusion for decorative layer
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Solution Overview
Problem
Conventional radio-wave transparent covers for radar systems have an undesirable black frame-like appearance due to the lack of a decorative layer near the peripheral edge, leading to wrinkles in the decorative layer caused by thermal contraction of the base layer during cooling.
Innovation Solution
A radio-wave transparent cover design featuring a plastic transparent layer with a protrusion extending rearward, a decorative layer covering the inner circumferential surface of the engaging end, and a base layer positioned behind the protrusion, which suppresses base layer contraction and allows the decorative layer to be closer to the peripheral edge, enhancing aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base layer is engaged with the protrusion on the rear-side surface of the transparent layer to suppress thermal contraction, then wrinkle formation in the decorative layer is prevented, but no decorative layer is provided in an about 4 mm wide region between the engaging protrusion and the periphery of the rear-side surface of the transparent layer, resulting in poor aesthetic appearance
Solution Approach 1:
The protrusion is designed with a dual-function structure: the outer peripheral surface engages with the base layer to suppress thermal contraction, while the inner circumferential surface provides a new engagement surface for the decorative layer. This dimensional differentiation allows the decorative layer to extend to the very periphery of the transparent layer, eliminating the 4 mm wide non-decorated region and improving aesthetic appearance without compromising wrinkle prevention
Solution Approach 2:
The protrusion structure serves multiple functions: (1) the outer peripheral surface engages with the base layer to suppress thermal contraction during cooling, (2) the inner circumferential surface engages with the decorative layer to allow it to extend to the periphery, and (3) the overall structure maintains the structural integrity of the multi-layer assembly. This multi-functionality resolves the contradiction by making the same structural element serve both wrinkle prevention and aesthetic enhancement
2Shape
If the decorative layer is extended closer to the peripheral edge to improve aesthetic appearance, then the black frame-like appearance is eliminated, but the base layer thermal contraction during cooling causes wrinkles in the decorative layer
Solution Approach 1:
The protrusion structure is pre-designed with an inner circumferential surface that engages with the decorative layer before the base layer cooling process begins. This preliminary engagement provides preemptive support to the decorative layer, preventing it from developing wrinkles when the base layer contracts during cooling, while still allowing the decorative layer to extend to the periphery for aesthetic enhancement
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 prevents wrinkling of the decorative layer and improves the aesthetic appearance by ensuring the base layer is not visible through the transparent layer, while maintaining radio-wave transparency and structural integrity.
Implementation Method 1
The base layer contracts as it cools down, pulling the decorative layer
Data Source
AI summary
The radio-wave transparent cover includes a plastic transparent layer, a decorative layer provided on the rear-side surface of the transparent layer, and a plastic base layer provided on the rear-side surface of the decorative layer. The transparent layer has a peripheral part having a protrusion extending rearward. The protrusion defines a peripheral edge of the transparent layer. The protrusion has an inner circumferential surface forming a part of an engaging end projecting rearward from the protrusion. The decorative layer is provided in a region of the rear-side surface of the transparent layer adjoining the inner circumferential surface of the engaging end.