Wedge Shaped Polymer Interlayers for Head-Up Display Windshields
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Solution Overview
Problem
Existing multiple layer glass panels, particularly those with wedge shaped interlayers, fail to effectively reduce sound transmission, especially in the range of 2,000 to 6,000 Hertz, which is a concern for head-up display windshields in vehicles where noise levels are undesirably high.
Innovation Solution
Incorporating an acoustic polymeric interlayer into wedge shaped laminated glass applications, specifically in windshields, where the interlayer is formed from a single or multiple polymer sheets with varying thicknesses to create a wedge shape, allowing for improved sound dampening by utilizing acoustic and non-acoustic polymer regions through coextrusion processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wedge shaped interlayer is used in laminated glass for head-up display applications, then the light dynamics required for head-up display are achieved, but the sound transmission level through the windshield becomes undesirably high
Solution Approach 1:
The interlayer is designed with varying thickness across its surface (wedge shape) to provide different acoustic impedance at different locations. This local variation in physical properties enables the interlayer to reduce sound transmission while maintaining the required light dynamics for head-up display applications.
Solution Approach 2:
The invention uses a composite structure combining glass layers with a polymer interlayer of varying thickness. This composite material approach allows the system to simultaneously achieve optical requirements for head-up display and acoustic requirements for noise reduction, as the polymer layer provides sound dampening while the overall structure maintains light transmission.
2Object-affected harmful factors
If the interlayer thickness is increased to reduce sound transmission, then the sound dampening characteristics improve, but the wedge shape required for head-up display may be compromised
Solution Approach 1:
The interlayer thickness parameter is varied continuously across the surface to create a gradient structure. By changing the thickness parameter from one region to another, the invention achieves both sound reduction (through increased thickness in certain areas) and maintains the wedge shape (through controlled thickness variation), resolving the contradiction between these two requirements.
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 acoustic polymeric interlayer reduces sound transmission through the windshield by at least 2 decibels, and up to 8 decibels or more, compared to conventional non-acoustic interlayers, effectively addressing the issue of noise transmission in vehicles with head-up display systems.
Implementation Method 1
The acoustic polymeric interlayer reduces sound transmission through the windshield by at least 2 decibels, and up to 8 decibels or more
Data Source
AI summary
The present invention is in the field of polymer interlayers and multiple layer glass panels comprising polymer interlayers, and, more specifically, the present invention is in the field of wedge shaped polymer interlayers.