Laser Headlight Fluorescent Plate Crack Detection
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Solution Overview
Problem
Conventional vehicular headlamps with laser light sources and fluorescent material plates face issues with eye safety due to the risk of laser light exposure when the fluorescent material plate detaches or develops minute cracks, which existing detection mechanisms cannot reliably detect, leading to potential harm to oncoming drivers.
Innovation Solution
A light source apparatus featuring a laser light source, a fluorescent material plate with transparent conductive film patterns, and a light scanning mechanism that includes a first transparent conductive film pattern within the laser beam irradiation region and a second pattern outside it, forming a continuous series connection wiring to detect resistance changes and prevent laser light emission if a defect occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent material plate is used with a laser light source to generate white light, then the light intensity and illumination quality are improved, but the risk of laser light exposure to oncoming drivers increases when the plate detaches or develops cracks
Solution Approach 1:
The fluorescent material plate is segmented into multiple sections, each with its own conductive film pattern. This segmentation allows independent detection of defects in each section, enabling precise identification of crack locations while maintaining overall system safety
Solution Approach 2:
A transparent conductive film pattern is introduced as an intermediary between the laser light source and the fluorescent material plate. This film serves dual purposes: it allows light transmission while providing a detectable electrical signal that indicates plate integrity, thus mediating between the optical function and safety monitoring
2Illumination intensity
If the fluorescent material plate is irradiated with high-intensity laser light to improve illumination, then the light output quality is enhanced, but minute cracks in the plate cannot be detected by existing detection mechanisms
Solution Approach 1:
The mechanical/optical detection system is replaced with an electrical detection system using transparent conductive films. Instead of relying on optical methods to detect cracks, the invention uses electrical resistance measurements through the conductive film patterns to identify crack locations with high precision
Solution Approach 2:
The invention utilizes changes in electrical resistance (analogous to color change in optical detection) of the transparent conductive film to indicate crack presence. When a crack occurs, the resistance pattern changes, providing a detectable signal that indicates defect location without affecting the optical appearance of the plate
3Reliability
If the fluorescent material plate is made more robust to prevent detachment, then the reliability is improved, but the ability to detect minute cracks through resistance changes is compromised
Solution Approach 1:
A thin transparent conductive film is applied to the fluorescent material plate surface. This thin film structure maintains the plate's mechanical robustness while introducing an electrical sensing layer that can detect cracks through resistance changes, combining structural integrity with defect detection capability
4Area of stationary object
If a light scanning mechanism is used to scan the fluorescent material plate, then the illumination coverage is improved, but the complexity of the detection system increases
Solution Approach 1:
The transparent conductive film pattern serves multiple functions simultaneously: it acts as an electrical sensing element for crack detection, maintains optical transparency for light transmission, and provides a structural layer on the fluorescent plate. This multi-functionality eliminates the need for separate detection systems, reducing overall complexity
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 apparatus effectively detects minute cracks in the fluorescent material plate, preventing dangerous laser light exposure by disconnecting the power supply when a defect is detected, ensuring the safety of oncoming drivers by maintaining the intensity and resolution of the emitted light.
Implementation Method 1
a fluorescent material plate 3 capable of emitting light 20 by converting light in a wavelength in response to irradiation with a laser beam 2
Implementation Method 2
detect a change in a resistance value of the series connection wiring
Data Source
AI summary
A light source apparatus includes: a laser light source; a fluorescent material plate including a laser beam irradiation region and being capable of emitting light generated by irradiating the laser beam irradiation region with a laser beam; a light scanning mechanism capable of scanning the laser beam irradiation region with the laser beam; a first transparent conductive film pattern disposed on the fluorescent material plate in the laser beam irradiation region; a second transparent conductive film pattern disposed on the fluorescent material plate outside the laser beam irradiation region and connected to the first transparent conductive film pattern to constitute a continuous series connection wiring; and an electric circuit electrically connected to the second transparent conductive film pattern, detect a change in a resistance value of the series connection wiring, and function to stop the driving of the laser light source when the resistance value falls outside a predetermined range.