Wedge-Shaped Multi-Layer Interlayer for HUD Acoustic and IR Management
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Solution Overview
Problem
Existing polymeric interlayers used in multiple layer glass panels, particularly those with wedge-shaped configurations for head-up display systems, face challenges in balancing sound dampening characteristics with desirable visual properties, while also effectively managing infrared radiation.
Innovation Solution
A multi-layer interlayer comprising a first and second wedge-shaped polymeric layer, with a third polymeric layer positioned between them, where the first and second layers have a glass transition temperature at least 10°C higher than the third layer, and specific thickness profiles and IR absorbing agents are incorporated to achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a multi-layer interlayer with acoustic polymeric layers is used to reduce noise transmission, then sound dampening characteristics are improved, but optical properties such as visual clarity deteriorate due to cloudiness or mottle
Solution Approach 1:
The patent applies local quality by creating an asymmetric multi-layer structure where outer layers have higher Tg (at least 10°C higher than inner layers) and specific thickness variations (at least one outer layer at least 10% thicker than the other at certain locations). This localized differentiation of material properties throughout the interlayer structure provides sound dampening in acoustic layers while maintaining visual clarity through the optimized layer configuration that prevents cloudiness and mottle.
2Object-affected harmful factors
If high concentrations of infrared absorbing particles are dispersed in the interlayer to block infrared radiation, then infrared absorption is improved, but transmission of specific wavelength ranges from sensors deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration and distribution of infrared absorbing particles within the interlayer structure. The particles are dispersed at optimized concentrations that provide sufficient infrared absorption while maintaining transmission in the 850-1050 nm wavelength range required for traffic and rain sensors. This parameter optimization resolves the contradiction between infrared blocking and sensor functionality.
3Illumination intensity
If the first and second polymeric layers are made thinner to improve visual properties, then optical clarity is improved, but sound dampening characteristics deteriorate
Solution Approach 1:
The patent applies composite materials by creating a multi-layer interlayer structure combining polymeric layers with different glass transition temperatures. The outer layers have higher Tg than the inner acoustic layers, and the specific thickness configuration (with at least one outer layer at least 10% thicker than the other at certain locations) optimizes both optical clarity and sound dampening. This composite structure allows thin outer layers for visual clarity while maintaining adequate sound dampening through the layered configuration.
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 proposed interlayer effectively maintains sound dampening and visual clarity, while providing sufficient infrared absorption, thus enhancing the performance of multiple layer glass panels, especially in automotive applications with head-up display systems.
Implementation Method 1
the first and second layers each have a Tg that is at least 10° C. higher than the glass transition temperature (Tg) of the third layer
Implementation Method 2
some interlayers include an infrared absorbing compound to control the amount of energy passing through the window or windshield and into the cabin of the vehicle
Data Source
AI summary
Multiple layer interlayers having enhanced optical and acoustic properties are provided, along with methods of making and using the same. Interlayers as described herein may include at least two outer skin layers and an inner core layer, with one of the outer skin layers having a different thickness than the other at one or more locations along the interlayer. The multi-layer interlayer may also exhibit acoustic properties and, in some cases, may have an overall wedged thickness profile. Additionally, in some aspects, interlayers and laminates formed therefrom may also provide reduced infrared energy transmission, without sacrificing acoustic and/or optical performance.