Light-Guided Warning Lamp Uniform Illumination via Total Reflection
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Solution Overview
Problem
Existing automotive warning lights for blind zones or lane changes have uneven light-emitting areas, with a high brightness-to-darkness ratio, affecting driving experience and requiring multiple LEDs for larger areas, increasing costs.
Innovation Solution
A light-guided warning lamp design using a light guide with a light entrance surface, first and second reflective surfaces, and total reflection stripes to convert and reflect light uniformly, along with a diffusion film for enhanced uniformity and exit angle adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light sources or LEDs are equipped to achieve larger light-emitting area, then the light-emitting area is increased, but the product cost increases
Solution Approach 1:
The light guide is divided into multiple functional surfaces: light entrance surface, first reflective surface, second reflective surface, and light exit surface. Each surface segment performs a specific optical function to collectively achieve uniform large-area illumination using a single light source, avoiding the need for multiple LEDs.
Solution Approach 2:
The light guide acts as an intermediary component between the single LED light source and the target illumination area. It transforms the point-source light into uniform parallel light distribution across a large area through its specially designed reflective surfaces and total internal reflection stripes.
2Illumination intensity
If total reflection stripes are added to the first and second reflective surfaces, then light uniformity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent replaces complex mechanical multi-LED arrangements with a single LED combined with an optically engineered light guide. The total internal reflection stripes are integrated into the light guide's geometry, eliminating the need for separate reflective components or complex mechanical assemblies while achieving superior light uniformity.
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 design achieves a uniform warning light distribution with a reduced brightness-to-darkness ratio, improving driving experience and reducing costs by ensuring even light coverage in the target area.
Implementation Method 1
the light emitted from the light source is converted to parallel light through the light entrance surface
Implementation Method 2
the first and second reflective surface are provided with total reflection stripes configured so that said parallel light is totally reflected to the second reflective surface through the first reflective surface and then totally reflected by the second reflective surface to said light exit surface
Implementation Method 3
outer surface of said light exit surface is provided with a diffusion film for increasing the uniformity of said warning light and increasing the exit angle of said warning light
Data Source
AI summary
A warning lamp used in lane change at blind zone of a vehicle includes a light source and a light guide including a light entrance surface, a first reflective surface, a second reflective surface, and a light exit surface, the light entrance surface is located above the light source so that the light emitted from the light source is converted to parallel light through the light entrance surface, said first reflective surface is arranged aslope above the light entrance surface, sides of s the first reflective surface are provided with the second reflective surface and the light exit surface, respectively, the first and second reflective surface are provided with total reflection stripes configured so that said parallel light is totally reflected to the second reflective surface through the first reflective surface and then totally reflected by the second reflective surface to said light exit surface to form uniform warning light.