LED Fog Lamp Reflector Array for Glare Reduction
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Solution Overview
Problem
Traditional halogen fog lamps have low optical efficiency and high power consumption, while LED fog lamps produce lower luminous flux and are sensitive to temperature, requiring effective thermal management and improved light distribution.
Innovation Solution
A fog lamp design featuring a circular transparent window, a plurality of reflectors positioned behind the window, and an LED array at a common focus point, with specific reflector configurations to produce collimated and angled light rays, including a central and lateral reflectors with concave surfaces, to enhance light distribution and reduce glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional halogen light bulbs are used in fog lamps, then high luminous flux is achieved, but power consumption is high and optical efficiency is low (about 18 percent)
Solution Approach 1:
The patent transitions from halogen bulb light sources to LED light sources, fundamentally changing the illumination parameter. LEDs consume significantly less power while maintaining adequate luminous flux for fog lamp applications, directly resolving the contradiction between high luminous flux and low power consumption.
2Illumination intensity
If traditional halogen light bulbs are used in fog lamps, then high luminous flux is achieved, but optical efficiency is low
Solution Approach 1:
The patent replaces halogen bulbs with LEDs, changing the light source parameter to achieve higher optical efficiency. LEDs convert electrical energy to light more efficiently, reducing energy loss and improving overall optical efficiency while maintaining sufficient luminous flux.
3Use of energy by moving object
If LED light sources are used in fog lamps, then power consumption is reduced and lifetime is extended, but luminous flux is lower and thermal management is required
Solution Approach 1:
The patent optimizes LED selection and configuration to achieve the required luminous flux for fog lamp applications. By carefully selecting LED specifications and arranging multiple LEDs in an array, the system maintains adequate illumination intensity while benefiting from reduced power consumption and extended lifetime.
Solution Approach 2:
The patent uses an array of multiple LEDs instead of a single light source. This segmentation allows the system to accumulate sufficient total luminous flux from individual LEDs while maintaining low power consumption per unit, resolving the contradiction between reduced power consumption and adequate illumination intensity.
4Duration of action of stationary object
If LED light sources are used in fog lamps, then lifetime is extended, but thermal management is required due to temperature sensitivity
Solution Approach 1:
The patent introduces a heat sink as an intermediary thermal management component. The heat sink absorbs and dissipates heat generated by LEDs, maintaining operating temperatures within optimal ranges and protecting the LEDs from temperature-related degradation, thereby extending lifetime while managing thermal sensitivity.
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 improved light distribution with reduced glare and increased efficiency, consuming less power while maintaining high luminous flux, making it a more effective and efficient alternative to traditional halogen fog lamps.
Implementation Method 1
a plurality of reflectors positioned behind the window, each reflector being operable to produce reflected rays of light
Data Source
AI summary
A fog lamp for use in an automobile includes a plurality of reflectors each sharing a common focus point, a light emitting diode array positioned at the common focus point, and a circular, non-optic window. The window fits through a standard-sized opening in an automobile fascia substantially two inches in diameter. The reflectors include a central reflector, a pair of lateral reflectors surrounding the central reflector and angled toward a center axis of the fog lamp, and a pair of converging reflectors surrounding the lateral reflectors and angled more sharply toward the center axis of the fog lamp. The central reflector and lateral reflectors produce beams of reflected light through the outer circumference of the window. The converging reflectors produce beams of reflected light converging at a secondary focus point within the fog lamp and transmitting through the window.