Divergent Reflection Surfaces for Fluorescent Plate Lighting
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Solution Overview
Problem
Existing fluorescent light source devices for projector apparatuses face challenges in reducing size due to complex structures, suffer from temperature quenching and shortened service life due to excessive excitation light condensation, and struggle with high light utilization efficiency.
Innovation Solution
A fluorescent light source device with a mirror member having excitation light reflection surfaces that convert excitation light into divergent light, combined with a light condensing optical system that focuses excitation light on the mirror member, allowing for a compact design and efficient fluorescent light emission without excessive condensation on the fluorescent plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If excitation light is excessively condensed on the fluorescent plate, then light utilization efficiency is improved, but temperature quenching occurs and service life is shortened
Solution Approach 1:
The patent divides the excitation light condensation into multiple reflection surfaces (first, second, third reflection surfaces) instead of concentrating all light through a single focal point. This segmentation allows distributed condensation that achieves high light utilization while preventing excessive localized heating that would shorten service life.
Solution Approach 2:
Different reflection surfaces are designed with different properties (reflective type or light-transmitting type) to control where and how excitation light is condensed. The light-transmitting reflection surface specifically allows selective transmission of excitation light while blocking fluorescent light, creating localized quality control to prevent temperature quenching in critical areas.
2Productivity
If a light condensing optical system and collimator optical system are separately provided, then light utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of light condensing and collimation into a single integrated optical system. The reflection surfaces are designed to simultaneously perform both condensation of excitation light and collimation of fluorescent light, eliminating the need for separate optical systems while maintaining high light utilization efficiency.
Solution Approach 2:
The reflection surfaces serve multiple functions: they act as light condensing elements for excitation light, as collimating elements for fluorescent light, and as wavelength-selective elements (in the case of light-transmitting reflection surfaces). This multi-functionality reduces device complexity while maintaining performance.
3Reliability
If the focal position is moved to prevent excessive condensation, then service life is extended, but light utilization efficiency decreases
Solution Approach 1:
Instead of moving the focal position along the optical axis (one dimension), the patent uses multiple reflection surfaces arranged in different spatial positions and orientations (adding spatial dimensions). This allows the excitation light to be condensed onto different areas of the fluorescent plate simultaneously, preventing excessive localization while maintaining high overall light utilization efficiency.
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 enables a compact, efficient fluorescent light source with reduced temperature quenching and extended service life, achieving high light utilization efficiency when used in projector apparatuses.
Implementation Method 1
the excitation light incident optical system includes a mirror member having a plurality of excitation light reflection surfaces for changing respective travel directions of the excitation light output from the respective excitation light sources
Implementation Method 2
a fluorescent plate for receiving the excitation light and emitting fluorescent light
Data Source
AI summary
An illumination device includes a plurality of excitation light sources; a fluorescent plate for receiving the excitation light and emitting fluorescent light; and an optical system for causing excitation light from each of the plurality of excitation light sources to be incident on the fluorescent plate, the optical system includes a plurality of reflection surfaces for redirecting the output from the respective excitation light sources into a divergent light pattern.