Vehicle Headlight Micromirror Thermal Load Reduction
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Solution Overview
Problem
High-peak power pulsed lasers cause heating issues in micromirror arrays, reducing their service life, and existing headlight systems struggle to maintain efficiency and compliance with legal illuminance levels, especially in fade-out scenarios with high duty cycles.
Innovation Solution
The computing unit synchronizes the micromirror array's control frequency with the light source control to suppress the focused light beam during OFF phases, shifting micromirrors by 180° and adjusting the light beam's direction to maintain a desired duty cycle, thereby reducing thermal load and achieving precise light image control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-peak power pulsed lasers are used to illuminate the micromirror array, then the brightness and visibility of the light image on the road is improved, but the thermal load on the micromirror array increases causing heating issues that reduce service life
Solution Approach 1:
The patent applies periodic action by synchronizing the light source pulses with the micromirror switching frequency. The light source is activated only during the time the micromirror is in the desired position, creating periodic illumination cycles that provide necessary brightness while allowing cooling periods when the micromirror switches positions, thereby reducing cumulative thermal load
Solution Approach 2:
The control system performs preliminary action by pre-synchronizing the light source activation with the micromirror switching sequence. The light source is activated just before or during the micromirror positioning, ensuring optimal illumination timing while preventing excessive energy accumulation that would cause overheating
2Productivity
If the micromirror array operates with high duty cycle in fade-out scenarios, then the efficiency and light output are maintained, but the thermal load increases and service life decreases
Solution Approach 1:
The system uses periodic action by implementing synchronized pulsing of the light source with the micromirror array at the control frequency. During fade-out scenarios, the light source is periodically activated only when micromirrors are in the ON state, maintaining efficient light output while creating periodic rest periods that reduce thermal accumulation and extend service life
Solution Approach 2:
The control system dynamically changes parameters by adjusting the duty cycle and pulse width of the light source based on the micromirror switching state. In fade-out scenarios, the system optimizes the light source duty cycle to match the micromirror ON-state duration, maintaining productivity while managing thermal load through parameter optimization
3Illumination intensity
If the light source is continuously activated to maintain high illuminance levels, then the visibility and compliance with legal requirements are ensured, but excessive heating occurs that can blind oncoming traffic
Solution Approach 1:
The patent implements periodic action by synchronizing light source activation with micromirror switching. The light source is activated only during specific time windows when micromirrors direct light toward the desired road area, creating periodic illumination cycles that maintain legal illuminance levels while preventing continuous light emission that would cause glare to oncoming traffic
Solution Approach 2:
The system applies local quality by using the micromirror array to precisely direct light only to the required areas on the road. The micromirrors individually control light direction, ensuring high illuminance levels are achieved only where needed while leaving other areas, including areas visible to oncoming traffic, in darkness
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 approach extends the service life of the micromirror array, maintains efficiency, and ensures compliance with legal illuminance levels by reducing excessive heating and allowing for flexible light image generation, including fade-out scenarios without significant blinding of oncoming traffic.
Implementation Method 1
the shaped light beam of the at least one light source is directed onto the micromirror array, and the structured, reflected light beam is projected onto the road
Implementation Method 2
at least one light source including a focusing optic
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Disclosed is a headlight for vehicles, said headlight comprising at least one light source (1) together with a focusing optical unit (6), a micromirror array (7), and an imaging optical unit (9), wherein a central computing unit (4) comprising a light source control (3) and an array control (12) is associated with the light source and with the micromirror array, and the central computing unit is configured to switch the position of the micromirror between an OFF state and an ON state periodically with a predefined control frequency and a predefined duty cycle by means of the array control. The formed light ray (2) from the at least one light source is directed at the micromirror array, and the light beam structured and reflected thereby is projected onto the road (11) as a light pattern (10) via the imaging optical unit (9), wherein the computing unit (4) is configured to suppress the focused light ray (2) directed at the micromirror array (7) at predefined times and synchronously with the control frequency of the micromirror array by means of the light source control (3) and/or the array control (12) .