Light Emitter Inversion for External Heat Dissipation
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Solution Overview
Problem
Biological sensing apparatuses with light emitters face poor cooling efficiency due to heat dissipation towards internal sensors, which can lead to reduced reliability and performance.
Innovation Solution
A light emitter design featuring a semi-insulating member with higher thermal conductivity than the mirror layers, a sub-mount for light passage, and a cooler on the light exit surface, allowing heat to be dissipated externally, thereby enhancing cooling efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light emitter is mounted with the light output facing inward toward the product interior, then the structure is simplified, but heat dissipation efficiency deteriorates because heat is directed toward internal components
Solution Approach 1:
The patent inverts the conventional mounting orientation by rotating the light emitter 180 degrees around the vertical axis, so that the light output direction is reversed from facing inward to facing outward. This inversion allows heat to be dissipated toward the exterior of the product rather than toward internal components, resolving the contradiction between structural simplicity and cooling efficiency
Solution Approach 2:
The patent changes the mounting orientation parameter (rotation angle around vertical axis) from the conventional position to 180 degrees, thereby altering the direction of both light output and heat dissipation. This parameter change enables heat to escape outward while maintaining the simplified mounting structure
2Temperature
If the light emitter is mounted junction-down on the mounting substrate, then heat dissipation performance is improved, but the light output direction is fixed toward the interior of the product
Solution Approach 1:
The patent introduces rotational flexibility by allowing the light emitter to be rotated around the vertical axis before mounting. This dynamic adjustment capability enables the system to optimize both heat dissipation direction and light output direction according to specific application requirements, transforming a fixed mounting solution into an adaptable one
Solution Approach 2:
By rotating the emitter 180 degrees around the vertical axis, the patent inverts the heat dissipation direction from inward-facing to outward-facing, allowing the junction-down mounting to simultaneously achieve excellent heat dissipation performance and outward heat rejection
3Reliability
If the light emitter is mounted with light output facing outward, then cooling efficiency is improved, but the mounting structure becomes more complex
Solution Approach 1:
The patent achieves outward-facing light output and heat dissipation through a simple 180-degree rotation of the light emitter around the vertical axis. This inversion requires no additional mounting components or complex structural modifications, maintaining simplicity while achieving superior cooling efficiency
Solution Approach 2:
The mounting structure is designed to accommodate the rotated orientation of the light emitter, allowing the same basic mounting mechanism to achieve both optimal heat dissipation and light output directions simultaneously, enhancing the universality and effectiveness of the mounting solution
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 design effectively dissipates heat externally, improving the cooling efficiency and reliability of the light emitter, reducing stress on internal components, and increasing the lifespan of the device.
Implementation Method 1
a semi-insulating member provided on a side surface of the columnar section and having thermal conductivity higher than thermal conductivity of the first mirror layer and thermal conductivity of the second mirror layer
Implementation Method 2
a sub-mount which has a first surface bonded to the semi-insulating member and through which light produced in the active layer passes
Data Source
AI summary
A light emitter includes a substrate, a first mirror layer provided on the substrate, a columnar section including an active layer provided on a side of the first mirror layer that is the side opposite the substrate and a second mirror layer provided on a side of the active layer that is the side opposite the first mirror layer, a semi-insulating member provided on the side surface of the columnar section and having thermal conductivity higher than the thermal conductivity of the first mirror layer and the thermal conductivity of the second mirror layer, and a sub-mount which has a first surface bonded to the semi-insulating member and through which light produced in the active layer passes, and a second surface of the sub-mount that is the surface opposite the first surface is oriented in the direction in which the light produced in the active layer exits.