Vehicle Lighting Assembly Using Optical Filter for Yellow Turn Signals
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Solution Overview
Problem
Current vehicle lighting assemblies face challenges in meeting automotive safety standards for yellow colored turn signals and red colored brake/taillights due to high costs, complexity, and styling requirements, particularly with the use of AlInGaP type yellow LEDs and multi-colored lenses.
Innovation Solution
A vehicle lighting assembly utilizing a single-color optical filter in combination with InGaN type yellow-green LEDs to shift the yellow-green light to the required yellow color range, while allowing red light to pass through without color shift, thereby reducing component count and cost, and meeting both SAE J578 and SAE J576 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AlInGaP type yellow LEDs and multi-colored lenses are used to meet yellow turn signal requirements, then photometric standards are satisfied, but manufacturing cost and device complexity increase
Solution Approach 1:
A single red lens is used to perform multiple functions: it filters yellow-green LED light to produce yellow turn signals while also allowing red brake light to pass through unchanged. This eliminates the need for separate yellow LEDs and multi-colored lenses, reducing component count while meeting both SAE J578 and SAE J576 standards
Solution Approach 2:
The patent changes the wavelength parameter of the light source from traditional yellow AlInGaP LEDs to yellow-green InGaN LEDs. This parameter change enables the use of a single red lens to achieve both yellow turn signal and red brake light functions, simplifying the overall assembly while maintaining photometric compliance
2Reliability
If AlInGaP type yellow LEDs are used for turn signals, then yellow color requirements are met, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive AlInGaP yellow LEDs with more cost-effective InGaN yellow-green LEDs. By combining these cheaper LEDs with a standard red lens, the solution achieves yellow turn signal compliance at lower manufacturing cost, effectively substituting an expensive component with a cheaper alternative that achieves the same functional result
Solution Approach 2:
The red lens acts as an intermediary that converts yellow-green LED light into yellow turn signal light. This intermediary component enables the use of cheaper InGaN LEDs instead of expensive AlInGaP yellow LEDs, reducing manufacturing cost while maintaining color compliance
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 enables a cost-effective and stylish vehicle lighting assembly that meets the photometric requirements for yellow turn signals and red brake/taillights, reducing manufacturing complexity and cost, while improving human reaction time through enhanced color contrast.
Implementation Method 1
The lens is a single-color optical filter configured to shift the yellow-green colored light emitted from the turn signal light source to a range of about 588 nm to about 592 nm
Data Source
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AI summary
A vehicle lighting assembly includes a housing, a circuit board, and a lens. The circuit board is disposed within the housing and includes a turn signal light source configured to emit yellow-green colored light at a peak intensity in a range of about 500 nm to about 570 nm. The lens is coupled to the housing. The lens is a single-color optical filter configured to shift the yellow-green colored light emitted from the turn signal light source to a range of about 588 nm to about 592 nm.