Light Source Device Non-Overlapping Fluorescence Conversion
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Solution Overview
Problem
In projector light source devices, the separation of excitation light and phosphor layers can lead to fluorescence loss from side surfaces, reducing the efficiency of fluorescence utilization.
Innovation Solution
A light source device configuration that includes a light source section emitting two pencils with different wavelength bands, optical elements to alter the direction of these pencils, and a wavelength conversion layer, where the optical elements ensure the pencils do not overlap on the plane of incidence, thereby minimizing fluorescence loss by directing them to non-overlapping areas on the wavelength conversion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the phosphor layer is irradiated with excitation light from the solid-state light source, then wavelength conversion occurs, but fluorescence is emitted from the side surface of the phosphor layer causing loss and decreased use efficiency
Solution Approach 1:
The patent segments the phosphor layer into multiple regions with different refractive indices (first region and second region). This segmentation allows different portions of the phosphor layer to handle light differently, directing fluorescence toward the optical system while minimizing side surface emission. The segmented structure creates internal light management that reduces energy loss.
Solution Approach 2:
The patent applies local quality by giving different optical properties to different parts of the phosphor layer. The first region has a first refractive index optimized for certain light paths, while the second region has a second refractive index for other light paths. This local differentiation ensures that fluorescence is preferentially directed toward the optical system rather than being lost from side surfaces.
2Area of stationary object
If multiple pencils are used to illuminate the wavelength conversion layer, then coverage is improved, but overlapping pencils cause increased fluorescence loss from side surfaces
Solution Approach 1:
The patent solves the overlapping problem by introducing a spatial dimension solution through the segmented phosphor layer structure. By creating regions with different refractive indices at different locations, the patent effectively manages light paths in multiple dimensions, allowing multiple pencils to illuminate the conversion layer without overlapping in a way that causes side surface loss.
Solution Approach 2:
The segmented phosphor layer acts as an intermediary between the multiple excitation pencils and the optical system. The different regions with different refractive indices mediate the light paths, ensuring that pencils are properly directed and converted without causing harmful overlaps that would lead to fluorescence loss from side surfaces.
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 configuration enhances the use efficiency of fluorescence by reducing losses from side surfaces, achieving a higher illumination efficiency compared to traditional designs.
Implementation Method 1
a wavelength conversion layer having a plane of incidence which the first pencil and the second pencil enter, and configured to perform wavelength conversion of the first pencil and the second pencil into fluorescence having a second wavelength band different from the first wavelength band
Data Source
AI summary
A light source device according to the present disclosure includes a light source section for emitting a first pencil and a second pencil which have a first wavelength band, a first optical element for altering a proceeding direction of a principal ray of the first pencil, a second optical element for altering a proceeding direction of a principal ray of the second pencil, and a wavelength conversion layer having a plane of incidence which the first pencil and the second pencil enter, and for performing wavelength conversion of the first pencil and the second pencil into fluorescence having a second wavelength band. The first optical element and the second optical element alter the proceeding directions of the principal ray of the first pencil and the principal ray of the second pencil so that the first pencil and the second pencil fail to overlap each other on the plane of incidence.