Vehicle Laser Headlight Safety Mirror Detection
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Solution Overview
Problem
Existing laser lighting modules for vehicle headlights lack comprehensive safety functionality and efficiency, particularly in detecting damage to the light converter, which can lead to reduced performance and potential eye safety risks for traffic participants.
Innovation Solution
A laser lighting module comprising a laser, scanning arrangement, light conversion device, safety mirror, and safety controller, where the safety mirror reflects a fraction of transmitted laser light to a safety detector, enabling detection of damage regardless of polarization, and the safety controller switches off the laser if a threshold is exceeded, ensuring eye safety and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor with pattern of conductive layers is integrated into the light converting layer, then safety detection capability is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The safety detection function is extracted from the light converting layer and implemented as a separate safety mirror and safety detector arrangement. This separates the safety detection subsystem from the light conversion subsystem, reducing device complexity while maintaining safety detection capability.
Solution Approach 2:
A safety mirror is introduced as an intermediary component to reflect a portion of the laser light to the safety detector. This intermediary enables safety detection without requiring direct integration of sensors into the light converting layer, simplifying the overall device structure.
2Reliability
If the safety mirror reflects a fraction of transmitted laser light, then safety detection reliability is improved, but light loss increases
Solution Approach 1:
The safety mirror reflects only a fraction or portion of the transmitted laser light rather than all of it. This partial action provides sufficient light for safety detection while minimizing light loss and maintaining overall system efficiency.
3Measurement precision
If polarization-sensitive sensors are used to detect light converter defects, then measurement precision is improved, but adaptability decreases
Solution Approach 1:
The safety detector is designed to detect safety detection light irrespective of polarization state, making the system universal and compatible with different laser types (polarized or non-polarized). This multi-functional capability maintains defect detection precision while increasing adaptability to various laser sources.
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 provides improved detection of damage to the light converter, enhancing safety and efficiency by monitoring all relevant transmitted laser light, reducing unnecessary light losses, and allowing for a broader range of lasers to be used, while ensuring reliable detection of intensity peaks caused by damage.
Implementation Method 1
The safety mirror is arranged to provide safety detection light by reflecting a fraction of the transmitted laser light hitting the safety mirror to the safety detector
Implementation Method 2
The light converter is arranged to convert a fraction of the laser light to converted light. The converted light is characterized by a second wavelength range different than the first wavelength range
Implementation Method 3
The light converter may be further arranged to scatter the laser light
Data Source
AI summary
A laser lighting module for a vehicle headlight includes at least one laser, a scanning arrangement, a light conversion device, a safety mirror, a safety detector and a safety controller. The laser emits light in a first wavelength range and the scanning arrangement moves a beam of the light within a scanning solid angle so a spot of the light moves across the light conversion device. The light conversion device converts a fraction of the light to converted light in a different wavelength range than the first and emits a mixture of transmitted and converted light. The safety mirror is arranged within the scanning solid angle such that at least 90% of the transmitted light hits the safety mirror. The safety controller receives the control signal, generated by the safety detector from the safety detection light, and switches off the laser if the control signal exceeds a first threshold value.