Curved Optical Member Light Source Device for Fluorescent Material Uniformity
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Solution Overview
Problem
The existing light source devices for projection-type image display devices suffer from reduced light-emitting efficiency and shortened service life of fluorescent materials due to concentrated excitation light irradiation, leading to high temperature and efficiency loss.
Innovation Solution
A light source device design that uses an optical member with curvature to diffuse excitation light, ensuring it is incident on the fluorescent material at a light-condensing position, thereby distributing the luminance evenly and reducing temperature extremes, which includes adjusting the positions and curvature of lenses or using optical fibers to spread the light uniformly across the fluorescent material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If excitation light is concentrated onto a single portion of the fluorescent material, then illumination intensity is improved, but the fluorescent material deteriorates in light-emitting efficiency and service life
Solution Approach 1:
The patent divides the concentrated excitation light into multiple light spots arranged in a matrix pattern across the fluorescent material surface. This segmentation distributes the illumination intensity across multiple regions rather than concentrating it at a single point, preventing localized overheating and material degradation while maintaining overall illumination effectiveness.
Solution Approach 2:
The patent transitions from one-dimensional concentrated illumination to two-dimensional distributed illumination by arranging light spots in a matrix pattern. This dimensional expansion allows the excitation light to cover a broader area of the fluorescent material, reducing the intensity at any single point while maintaining total illumination energy.
2Illumination intensity
If excitation light is concentrated onto a single portion of the fluorescent material, then illumination intensity is improved, but light-emitting efficiency deteriorates
Solution Approach 1:
The patent segments the concentrated light beam into multiple discrete light spots distributed across the fluorescent material. This segmentation prevents energy over-concentration that causes thermal degradation and efficiency loss, while maintaining the total energy input to the fluorescent material for optimal light-emitting efficiency.
Solution Approach 2:
The patent applies different illumination characteristics to different regions of the fluorescent material by creating a matrix of light spots. Each local region receives appropriate illumination intensity, preventing localized overheating that would reduce light-emitting efficiency, while ensuring uniform overall performance across the entire material surface.
3Illumination intensity
If optical member curvature is increased to concentrate light, then illumination intensity improves, but temperature rise increases
Solution Approach 1:
The patent uses the optical member to segment the concentrated light into multiple spots, distributing the thermal load across multiple locations on the fluorescent material. This prevents excessive temperature rise at any single point while maintaining the illumination intensity required for effective excitation across the entire material surface.
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 design enhances the light-emitting efficiency and extends the service life of the fluorescent material by preventing excessive temperature rise and ensuring uniform luminance distribution across the irradiation region.
Implementation Method 1
The optical member has a curvature that is set so as to allow the excitation light that has passed through the optical member to be made incident on the fluorescent material at a front side of the fluorescent material as a light-condensing position
Implementation Method 2
a fluorescent material for emitting fluorescent light when excited by the excitation light
Data Source
AI summary
To provide a light source device and a projection-type image display device which can improve light emitting efficiency and service life of a fluorescent material. The light source device includes: an excitation light source for emitting excitation light; a fluorescent material for emitting fluorescent light when excited by the excitation light; and an optical member for directing the excitation light to the fluorescent material. The optical member has a curvature that is set such that a light-condensing position of the excitation light is positioned on a light-emitting side of the excitation light relative to the fluorescent material. An optical fiber is disposed between the excitation light source and the light source, so that the excitation light from the excitation light source may be made incident on the optical fiber.