LED Light Source Spacer Air-Gap Isolation for Output Stability
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Solution Overview
Problem
Existing biochemical analysis devices with LED modules face challenges in stabilizing light output quickly after power activation and suppressing luminance efficiency fluctuations due to temperature variations in fluctuating environments.
Innovation Solution
The device incorporates a spacer with higher heat conductivity than the holder, covered by a concave portion of the holder through an air layer, reducing the exposed area and increasing thermal resistance to stabilize LED temperature and suppress fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a cooling mechanism using water cooling or air cooling is provided on the opposite side of the heat sink to the LED module, then the time required to stabilize the light amount of the LED light source is shortened, but the temperature of the LED module fluctuates when installed in an environment where temperature fluctuation is large
Solution Approach 1:
The holder is divided into a light source holder and a base holder that are separated by a gap, allowing independent thermal management. The light source holder can be optimized for rapid heat dissipation to shorten stabilization time, while the base holder provides thermal insulation to suppress temperature fluctuations in the LED module.
Solution Approach 2:
A light guide plate is introduced as an intermediary component between the LED module and the base holder. This light guide plate acts as a thermal barrier that reduces heat transfer from the base holder to the LED module, thereby suppressing temperature fluctuations while allowing the light source holder to maintain rapid stabilization.
2Productivity
If the spacer is formed of a material having high heat conductivity, then the light amount stabilizes quickly, but the temperature fluctuation of the LED module increases in environments with temperature changes
Solution Approach 1:
The holder structure employs different thermal conductivity characteristics in different regions. The light source holder portion uses materials with high heat conductivity to rapidly stabilize the LED light source, while the base holder portion uses materials with low heat conductivity to isolate the LED module from environmental temperature fluctuations.
Solution Approach 2:
The holder is segmented into functionally distinct regions: a light source holder for rapid thermal response and a base holder for thermal isolation. This segmentation allows each region to be optimized for its specific function without compromising the other.
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 shortens the time to stabilize LED light output and reduces temperature fluctuations, maintaining consistent luminance efficiency even in environments with significant temperature changes.
Implementation Method 1
a convex portion of the spacer is covered with a concave portion of the holder through an air layer
Implementation Method 2
the spacer is formed of a material having a heat conductivity higher than that of the holder
Data Source
AI summary
A biochemical analysis device that emits light used to measure absorbance of a sample includes an LED that emits the light, a substrate on which the LED is mounted, a spacer that supports the substrate, a holder that accommodates the LED, the substrate, and the spacer, and a flow path formed by circulating constant temperature water through the holder. The spacer is formed of a material having a heat conductivity higher than that of the holder. The spacer is in contact with the holder at a contact portion. A convex portion of the spacer is covered with a concave portion of the holder through an air layer.