Wavelength Conversion Element Air Layer Cooling
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Solution Overview
Problem
Existing light source apparatuses face challenges in providing a light transmissive member on the excitation light incident side due to the lack of adhesives with the required transparency, heat resistance, and refractive index, which hinders efficient cooling and wavelength conversion efficiency.
Innovation Solution
A wavelength conversion element is designed with a light transmissive member having a curved surface opposite to the excitation light direction, bonded via a support member, and an air layer thinner than the bonding member is introduced between the light transmissive member and the wavelength conversion layer to enhance heat dissipation and reduce interface reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a light transmissive member with high thermal conductivity is provided on the excitation light incident side, then heat dissipation performance is improved, but no adhesive with required light transparency, high heat resistance, and specific refractive index is available
Solution Approach 1:
An air layer is introduced as an intermediary between the light transmissive member and the wavelength conversion layer. The air layer serves as a thermal conduction path that eliminates the need for specialized adhesives, while maintaining light transparency and enabling effective heat dissipation from the wavelength conversion layer to the light transmissive member.
2Temperature
If a light transmissive member is provided on the excitation light incident side, then heat dissipation is improved, but interface reflection increases
Solution Approach 1:
The air layer acts as an intermediary layer between the light transmissive member and the wavelength conversion layer, reducing refractive index mismatch and minimizing interface reflection. This allows the light transmissive member to be positioned close to the wavelength conversion layer for effective heat dissipation without causing significant optical loss due to reflection.
3Temperature
If the light transmissive member is positioned close to the wavelength conversion layer for heat dissipation, then heat transfer efficiency is improved, but interface reflection increases
Solution Approach 1:
The air layer is positioned between the light transmissive member and the wavelength conversion layer to mediate the thermal and optical interaction. This intermediary layer enables close positioning for heat transfer while maintaining light transparency by reducing refractive index mismatch, thus simultaneously achieving efficient heat dissipation and minimal interface reflection.
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 effectively suppresses interface reflection, improves heat dissipation, and maintains wavelength conversion efficiency, allowing for a reliable light source apparatus and projector with enhanced performance.
Implementation Method 1
an air layer is provided between the light incident surface of the wavelength conversion layer and the light transmissive member, and the air layer is thinner than the bonding member
Implementation Method 2
a light transmissive member that has a curved surface that protrudes in a direction opposite a direction in which the excitation light travels
Implementation Method 3
a phosphor on which the collected excitation light is incident and which is excited with the incident excitation light to radiate fluorescence
Data Source
AI summary
A wavelength conversion element according to an aspect of the invention includes a wavelength conversion layer having a light incident surface on which excitation light is incident and a light exiting surface that faces away from the light incident surface and a cooler including a support member that supports the wavelength conversion layer and a light transmissive member that has a curved surface that protrudes in the direction opposite the direction in which the excitation light travels, faces the light incident surface of the wavelength conversion layer, and is bonded to the support member via a bonding member. An air layer provided between the light incident surface of the wavelength conversion layer and the light transmissive member, and the air layer is thinner than the bonding member.