Vehicle Headlight Bezel Heat Resistance via Anthraquinone Dyes
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Solution Overview
Problem
Vehicle headlight assemblies lack sufficient heat resistance, which can lead to performance degradation and reliability issues under varying environmental conditions.
Innovation Solution
A vehicle headlight assembly is designed with a bezel and optionally a housing made from a thermoplastic resin and a colorant, specifically using anthraquinone dyes or their amine salts, which are selected to enhance heat resistance and provide color options without metal plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal plating is used on the bezel to provide color and light reflection, then the aesthetic appearance and light reflection are improved, but the heat resistance and durability under high temperature conditions deteriorate
Solution Approach 1:
The patent changes the material parameters by using thermoplastic resin with specific glass transition temperature (Tg ≥ 80°C) and melting point (≥ 220°C) requirements, combined with organic colorants, to achieve both color functionality and heat resistance without metal plating
Solution Approach 2:
The patent creates a composite material system combining thermoplastic resin base material with organic colorants (anthraquinone, perinone, or azo dyes) to simultaneously achieve coloration, light reflection, and high temperature stability that neither component could achieve alone
2Ease of manufacture
If traditional thermoplastic resin is used for the bezel, then the ease of manufacture and cost are improved, but the heat resistance and color stability under varying environmental conditions deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for the thermoplastic resin including glass transition temperature (Tg ≥ 80°C) and melting point (≥ 220°C) to ensure the material maintains both manufacturability through injection molding and sufficient heat resistance for headlight applications
Solution Approach 2:
The patent replaces expensive metal plating processes with a more economical organic colorant-based coloring method that integrates directly into the molding process, reducing manufacturing complexity and cost while achieving the desired aesthetic and functional properties
3Reliability
If organic colorants are used instead of metal plating, then the heat resistance is improved, but the color variety and design options may be limited
Solution Approach 1:
The patent makes the organic colorant system universal by selecting dye classes (anthraquinone, perinone, azo) that can produce multiple colors and can be combined in various proportions to achieve different shades, providing design versatility comparable to metal plating while maintaining heat resistance
Solution Approach 2:
The patent applies different organic colorants to different regions or components of the headlight assembly (bezel, housing, trim pieces) to create varied color schemes and design patterns, enabling aesthetic customization without compromising the heat resistance of any individual component
Data Source
AI summary
This invention relates to a vehicle headlight assembly comprising: a light source, a housing supporting the light, a bezel equipped over the front side of the housing, and a transparent cover being equipped over the front side of the bezel, wherein the bezel and optionally the housing comprises a thermoplastic resin and a colorant, wherein the colorant is selected from the group consisting of an anthraquinone dye, an amine salt thereof and a mixture thereof.