Light Source Device Heat Conductive Member Thermal Management
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Solution Overview
Problem
The existing light source devices for projection type display apparatuses using laser diodes face challenges in efficiently cooling the fluorescent body, which leads to reduced fluorescent conversion efficiency and shortened lifespan due to inadequate heat dissipation, especially when glass or quartz is used in the light condensing optical system.
Innovation Solution
A light source device configuration that includes a wavelength conversion element with a fluorescent body, a light condensing member, and a heat conductive member, where the heat conductive member has higher conductivity than the light condensing member, and they are overlapped and in contact with each other in the optical axis direction, along with a heat dissipation member to effectively dissipate heat generated by the fluorescent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fluorescent body is in close contact with the light condensing optical system made of glass or quartz, then heat transmission from the fluorescent body is improved, but heat dissipation is insufficient due to the low thermal conductivity of glass or quartz
Solution Approach 1:
The patent introduces a heat conductive member as an intermediary substance between the fluorescent body and the light condensing optical system. This mediator has higher thermal conductivity than glass or quartz, enabling efficient heat transmission from the fluorescent body while overcoming the poor heat dissipation properties of the optical system material.
Solution Approach 2:
The patent changes the thermal conductivity parameter by replacing the direct contact interface (fluorescent body to glass/quartz) with an intermediate layer having superior thermal conductivity. This parameter change resolves the contradiction by maintaining thermal contact while improving heat dissipation capability.
2Productivity
If the fluorescent body is in close contact with the substrate for heat transmission, then cooling efficiency is improved, but the light condensing optical system cannot dissipate heat sufficiently due to material limitations
Solution Approach 1:
The heat conductive member serves as a dual-function intermediary: it transmits heat from the fluorescent body to the substrate while also providing a thermal pathway that overcomes the heat dissipation limitations of the glass or quartz optical system.
3Illumination intensity
If glass or quartz is used as the light condensing optical system material, then optical performance is maintained, but thermal conductivity is insufficient for effective cooling
Solution Approach 1:
The patent segments the thermal management function from the optical function by introducing a separate heat conductive member. The light condensing optical system maintains its optical performance with glass or quartz, while the heat conductive member handles thermal conductivity independently.
Solution Approach 2:
The heat conductive member performs multiple functions: it acts as a thermal conduit between the fluorescent body and substrate, and simultaneously compensates for the insufficient heat dissipation capability of the glass or quartz optical system, without interfering with optical performance.
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 cooling efficiency for the fluorescent body, reducing thermal resistance and prolonging its lifespan by efficiently transmitting and dissipating heat, thereby maintaining the luminance and durability of the light source.
Implementation Method 1
a heat conductive member having heat conductivity greater than heat conductivity of the light condensing member, wherein at least a part of the fluorescent body, the heat conductive member, and the light condensing member are overlapped and in contact with each other
Implementation Method 2
a light condensing member for condensing light from the light source to the wavelength conversion element
Implementation Method 3
converts a wavelength of the condensed light by fluorescent conversion, and emits light including green light and red light
Data Source
AI summary
A light source device includes a wavelength conversion element having a fluorescent body for converting a wavelength of light from a light source, a light condensing member for condensing light from the light source to the wavelength conversion element, the light condensing member being arranged to face a surface of the fluorescent body, and a heat conductive member having heat conductivity greater than heat conductivity of the light condensing member, wherein an area where at least a part of the fluorescent body, the heat conductive member, and the light condensing member are overlapped and in contact with each other in this order is arranged, when viewed from an optical axis direction of the light condensing member.