Ellipsoidal Light Guide Entry for Vehicle Lamp Flux
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Solution Overview
Problem
Current LED light sources in motor vehicle light guides face inefficiencies due to low luminous flux and inadequate light distribution, particularly in rear lamps where red light sources are lacking, and existing collimation solutions are cumbersome and inefficient for small light guide diameters.
Innovation Solution
A light device featuring an elongated light guide with an entry part composed of intersecting ellipsoids, where LED light sources are seated in the first focuses for optimal light reflection and distribution within the guide, allowing for improved light concentration and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED light sources are installed in higher quantities in a flat arrangement to increase total luminous flux intensity, then the total luminous flux intensity is improved, but the device complexity and space requirements worsen
Solution Approach 1:
The patent combines multiple LED light sources (first and second LED light sources) into a single entry part of the light guide, merging their light output into one integrated structure. This eliminates the need for separate flat arrangements of multiple LED modules, reducing device complexity while maintaining high luminous flux intensity through the combined output of multiple diodes seated in one entry part.
2Illumination intensity
If the entry part of the light guide has a parabolic shape to collimate light, then the luminous flux is improved, but the light distribution efficiency in the light guide worsens
Solution Approach 1:
The patent applies different geometric characteristics to different regions of the light guide entry part. The entry part features an ellipsoidal shape with specific focal properties that differ from uniform parabolic collimators. This local geometric optimization allows simultaneous achievement of high luminous flux concentration and efficient light distribution throughout the light guide, as the ellipsoidal geometry naturally directs light rays to specific focal regions while maintaining broad coverage.
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
This configuration enhances LED light source efficiency, ensures better light distribution and homogeneity, and enables the use of standard LED sources for higher luminous flux applications, including red light functions in motor vehicle rear lamps.
Implementation Method 1
LED light sources are seated in the first focuses for emission of light beams
Implementation Method 2
emission of light beams and their reflection from the elliptic walls of the ellipsoids to the second focuses
Implementation Method 3
the entry part of the light guide consists of mutually intersecting parts of at least two ellipsoids arranged with their main axes next to each other while the LED light sources are fitted in the first focuses of the ellipsoids
Data Source
AI summary
A light device comprises an elongated light guide (2) and a LED source (1) seated in the light guide entry part (3) for emitting the light beam into the light guide (2). The entry part of the light guide comprises mutually intersecting parts of at least two ellipsoids (11, 21) arranged with their main axes (14, 24) next to each other. The LED light sources are fitted in the first focuses (15, 25) of the ellipsoids for emission of light beams and their reflection from the elliptic walls (13, 23) thereof to the second focuses (16, 26) thereof, laying inside the light guide in different distances from the first focuses. The distance between the first focus (15) and the second focus (16) of the first ellipsoid (11) preferably equals at least 1.5 times the distance between the first focus (25) and the second focus (26) of the second ellipsoid (21).