Fluorescent Light Emitting Device for Arbitrary Headlamp Patterns
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Solution Overview
Problem
Conventional light source devices achieve limited light-projection patterns as they only irradiate the focal point with a laser beam, leaving the surrounding area unlit, restricting their application to specific and limited light-distribution states.
Innovation Solution
A light emitting device design where the light emitting section is positioned to include both the focal point and its periphery, with the focal point being most strongly excited and the periphery excited based on the light intensity distribution of the excitation light, allowing for arbitrary light-projection patterns by controlling the light intensity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the fluorescent material is positioned only at the focal point to achieve strong light emission, then the illumination intensity at the focal point is improved, but the light-projection pattern becomes limited and cannot cover the surrounding area
Solution Approach 1:
The patent applies local quality by creating different excitation intensity zones within the light emitting section. The focal point region receives high-intensity excitation light for strong narrow-angle illumination, while the peripheral region receives lower-intensity excitation light for wide-angle illumination. This spatial variation in excitation quality enables the system to achieve both focused and distributed light projection patterns simultaneously, resolving the contradiction between illumination intensity and light-projection versatility.
2Use of energy by moving object
If the laser beam is concentrated only at the focal point to maximize energy utilization, then the energy efficiency is improved, but the illuminated area is restricted to a small region
Solution Approach 1:
The patent utilizes parameter changes by varying the excitation light intensity distribution across different spatial regions of the light emitting section. By controlling the excitation light parameters (intensity, distribution pattern) to create a gradient from the focal point to the periphery, the system efficiently converts laser energy into fluorescence with different emission characteristics. This enables both high energy utilization at the focal point and extended illuminated area through peripheral emission, resolving the contradiction between energy efficiency and illuminated area.
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
Enables the light emitting device to achieve arbitrary light-projection patterns, enhancing its usability and convenience by illuminating both a narrow and wide solid angle, addressing the limitation of only irradiating the focal point in conventional devices.
Implementation Method 1
a light emitting section for emitting fluorescence by receiving the excitation light emitted from the excitation light source
Data Source
AI summary
A headlamp includes an laser element for emitting a laser beam; a light emitting section for emitting fluorescence by receiving the laser beam emitted from the laser element; and a parabolic mirror for reflecting the fluorescence emitted from the light emitting section, the light emitting section being placed so that a focal point of the parabolic mirror and a periphery of the focal point are positioned on the light emitting section, the light emitting section being most strongly excited at a portion corresponding to the focal point, meanwhile, at a portion corresponding to the periphery of the focal point, the light emitting section being excited with intensity being dependent on light intensity distribution of the excitation light on an irradiation surface of the light emitting section.