Parabolic Reflector Panel Arrays for LED Headlamp Beam Control
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Solution Overview
Problem
Existing vehicle headlamps with LED technology face challenges in achieving a desired luminous intensity distribution and beam shape due to inadequate reflector panel configurations, which affect the performance of low and high beam light emissions.
Innovation Solution
A parabolic reflector with specific arrays of reflector panels, each with defined angles, is used within a vehicle headlamp housing to optimize the light emission from LED chips, featuring distinct low and high beam reflector panel angles to achieve a precise luminous intensity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a parabolic reflector with multiple rows and columns of reflector panels having different reflector panel angles is used, then the luminous intensity distribution is improved, but the device complexity increases
Solution Approach 1:
The reflector is divided into multiple discrete reflector panels arranged in rows and columns, each panel having a specific reflector panel angle. This segmentation allows independent optimization of each panel's angle to achieve precise luminous intensity distribution while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
Different reflector panels are assigned different reflector panel angles based on their specific positions in the array. This local differentiation optimizes the light reflection characteristics for each panel location, enabling precise control over the overall luminous intensity distribution pattern
2Manufacturing precision
If separate reflector panels with specific angles are used for low beam and high beam, then the beam shape precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The reflector system is segmented into distinct low beam reflector panels and high beam reflector panels, each optimized for their specific beam requirements. This segmentation enables precise control over beam shapes while allowing standardized manufacturing processes for each panel type
Solution Approach 2:
The reflector panel angles are pre-calculated and pre-set during the design and manufacturing phase to achieve the desired luminous intensity distribution. This preliminary configuration eliminates the need for complex post-manufacturing adjustments, simplifying the overall manufacturing process while maintaining high precision
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 effectively enhances the luminous intensity distribution and beam shape, improving the visibility and safety of motor vehicles by optimizing the light emission patterns for both low and high beam functions.
Implementation Method 1
a parabolic reflector of a vehicle headlamp wherein a plurality of reflecting elements or panels provides a desired luminous intensity distribution which is realized by each panel having a reflector panel angle, defined herein as the angle between a light beam from a light emitting diode traveling to a specific reflector panel and a beam reflected by the reflector panel
Data Source
AI summary
A parabolic reflector is utilized for a vehicle head lamp having a housing, lens, light emitting diodes and control circuits for the light emitting diodes. The parabolic reflector comprises a plurality of reflective panels in an upper array for the low beam and a lower array for the high beam. The upper array is formed by three rows of twelve panels in side-to-side configuration. The lower array is divide into two separate groups, with each group having a two outermost panels, two intermediate panels and two innermost panels. The reflective panels of the upper array and the lower array are so positioned with respect to the light emitting diodes as to form a desired luminous intensity distribution from the head lamp.