Wavelength Conversion Element Homogeneous Illuminance
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Solution Overview
Problem
Existing light source devices suffer from inhomogeneous illuminance distribution and fluorescence emission efficiency deterioration due to localized excitation light irradiation on phosphors, leading to heat generation and reduced performance.
Innovation Solution
A wavelength conversion element is designed with a cemented body formed by bonding a phosphor layer and a light guide member, where the excitation light enters through a specific surface, allowing it to propagate through the light guide and homogeneously irradiate the phosphor, reducing local heat generation and enhancing fluorescence emission efficiency. The light guide member, made of high thermal conductivity materials like sapphire, aids in heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If excitation light is directed through a light guide to irradiate phosphor, then the light source device can generate fluorescence for illumination, but the illuminance distribution becomes inhomogeneous and local heat generation occurs
Solution Approach 1:
The patent applies local quality by configuring the light guide member with different surface characteristics: the first surface (light input) has high reflectivity to maintain light intensity, while the second surface (phosphor interface) has low reflectivity to enable homogeneous light distribution. This differential surface treatment ensures that different regions of the light guide perform different functions - the input region preserves light intensity while the output region distributes light uniformly across the phosphor layer, preventing localized overheating.
2Power
If excitation light is concentrated on a specific area of phosphor to generate fluorescence, then light emission efficiency can be maintained, but heat generation causes deterioration in fluorescence emission efficiency
Solution Approach 1:
The light guide member serves as an intermediary between the excitation light source and the phosphor layer. It receives concentrated excitation light from the light source and transforms it into uniformly distributed light across the phosphor surface through controlled total internal reflection and optimized surface reflectivity. This intermediary function prevents direct concentrated heating of the phosphor while maintaining efficient fluorescence generation, thereby preserving both light emission efficiency and operational reliability.
3Ease of operation
If a light guide member is used to transmit excitation light, then the light can be directed to phosphor, but inhomogeneous illuminance distribution occurs
Solution Approach 1:
The patent applies parameter changes by modifying the reflectivity parameter of the light guide member's surfaces. The first surface is designed with high reflectivity (maintaining light intensity) while the second surface has low reflectivity (enabling uniform distribution). This parameter differentiation allows the light guide to simultaneously achieve effective light direction control and homogeneous illuminance distribution across the phosphor layer.
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 achieves homogeneous illuminance distribution and prevents fluorescence emission efficiency deterioration by reducing local heat generation in the phosphor layer, resulting in improved light emission efficiency and brightness in light source devices and projectors.
Implementation Method 1
a light guide member configured to transmit the first light and the second light
Implementation Method 2
a first wavelength conversion member which is excited by first light to emit second light having a wavelength band different from a wavelength band of the first light
Implementation Method 3
The light guide member, made of high thermal conductivity materials like sapphire, aids in heat dissipation
Data Source
AI summary
A wavelength conversion element according to the present disclosure includes a cemented body obtained by bonding a first wavelength conversion member which is excited by first light to emit second light having a wavelength band different from a wavelength band of the first light, and a first light guide member configured to transmit the first light and the second light, and a reflecting member which is disposed so as to be opposed to at least one surface parallel to a first direction out of a plurality of outer circumferential surfaces of the cemented body, and reflects at least one of the first light and the second light.