Vehicular Lighting Circuit with Scanning Reflector for Adaptive Beam Control
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Solution Overview
Problem
Adaptive driving beam (ADB) technologies face issues with instantaneous and discontinuous light distribution patterns causing discomfort to drivers and safety concerns due to sudden changes in illumination.
Innovation Solution
A lighting circuit for vehicular lighting devices that includes a semiconductor light source, a reflector, and a lighting control system to continuously vary light intensity and distribution patterns based on the reflector's periodic motion, using a position detector and light intensity calculator to estimate and adjust light output accordingly, ensuring smooth transitions and reduced glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reflector continuously scans the front of the vehicle with reflected light, then the light distribution pattern can be dynamically adjusted, but instantaneous and discontinuous variation of the light distribution pattern causes discomfort to the driver
Solution Approach 1:
The patent applies the continuity principle by ensuring that the light distribution pattern varies continuously rather than discontinuously. The control unit adjusts the light intensity of the semiconductor light source based on the rotational position of the reflector, maintaining continuous illumination across the scanned regions. This prevents sudden darkness or abrupt shifts in irradiated regions, thereby eliminating driver discomfort while preserving adaptive light distribution capabilities.
2Manufacturing precision
If the semiconductor light source is turned on and off based on reflector position, then precise light distribution control is achieved, but discontinuous light output creates sudden darkness in previously irradiated regions
Solution Approach 1:
The patent applies dynamics by transitioning from a static on/off control approach to a dynamic continuous intensity adjustment approach. The light intensity of the semiconductor light source is continuously varied based on the rotational position of the reflector, rather than being simply turned on or off. This dynamic control maintains precise light distribution while ensuring continuous illumination, preventing sudden darkness in previously irradiated regions.
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 reduces driver discomfort and enhances safety by providing a seamless and adaptive light distribution that adjusts to changing conditions, minimizing glare and flicker effects.
Implementation Method 1
a semiconductor light source; and a reflector that receives emitted light of the semiconductor light source
Implementation Method 2
a reflector that receives emitted light of the semiconductor light source and repeats a predetermined periodic motion so as to scan the front of a vehicle with reflected light of the emitted light
Data Source
AI summary
A blade receives light emitted from a light source and repeats a predetermined periodic motion to scan the front of a vehicle with reflected light of the emitted light. A position detector generates a position detection signal S4 indicating a timing at which a predetermined reference point of the blade passes a predetermined position. Based on the position detection signal S4, a period calculator calculates a period Tp of the periodic motion of the blade. A light intensity calculator receives light-distribution-pattern information S3 to be formed in front of the vehicle and calculates light intensity to be generated by the light source at each time based on the position detection signal S4 and the period Tp. A driver turns on a semiconductor light source so as to obtain the light intensity calculated by the light intensity calculator at each time.