LED Light Irradiating Device Cooling via Air Circulation
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Solution Overview
Problem
Ultraviolet ray irradiating devices using LEDs face issues with heat generation, leading to reduced luminous efficiency and lifespan, and deformation of reflective tubes due to high temperatures, resulting in non-uniform light distribution.
Innovation Solution
A light irradiating device configuration that includes a housing with a reflective mirror and a heat radiating member, such as a water cooling heat sink, along with air circulation and a fan to efficiently cool the reflective mirror and maintain a uniform light distribution by preventing temperature increases in the light passage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reflective tube is used to guide and mix ultraviolet rays from LED light emitting elements, then a uniform irradiating distribution is obtained in the irradiating area, but the reflective tube is deformed due to high temperature when ultraviolet rays are irradiated onto it
Solution Approach 1:
The harmful ultraviolet rays are extracted from the system by using a light absorbing member instead of a reflective tube. The light absorbing member absorbs the ultraviolet rays that would otherwise heat the reflective tube, preventing thermal deformation while maintaining the light guiding and mixing function through a different mechanism.
Solution Approach 2:
The harmful ultraviolet rays that cause heating are converted into a beneficial function by using a light absorbing member. The absorbed ultraviolet energy is dissipated as heat in a controlled manner, preventing the thermal deformation issue while still achieving uniform light distribution through the light guiding structure.
2Use of energy by moving object
If LED light emitting elements are used as a light source, then power consumption is reduced and lifespan is elongated, but heat is generated that lowers luminous efficiency and lifespan
Solution Approach 1:
A light absorbing member is introduced as an intermediary between the LED light emitting elements and the surrounding environment. This member absorbs the ultraviolet rays and converts them to heat in a controlled manner, preventing heat accumulation that would otherwise reduce LED luminous efficiency and lifespan, while maintaining the benefits of low power consumption LED operation.
3Stability of the object's composition
If a reflective tube is used to enclose the base plate to guide ultraviolet rays, then light mixing is achieved, but the ultraviolet rays cause high temperature in the reflective tube leading to deformation
Solution Approach 1:
The reflective tube is replaced with a light absorbing member that extracts the problematic ultraviolet radiation from the system. This eliminates the thermal deformation issue while maintaining the light guiding and mixing function through the light absorbing structure, ensuring both structural stability and light mixing uniformity.
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 effectively suppresses temperature increases in the reflective mirror and the light passage area, preventing deformation and ensuring uniform light distribution, thus extending the lifespan and improving the luminous efficiency of the LED light source.
Implementation Method 1
a light absorbing member which absorbs light from the plurality of light emitting diode elements
Implementation Method 2
a heat radiating member, such as a water cooling heat sink
Data Source
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AI summary
Provided is a light irradiating device which has a configuration to efficiently cool a member disposed in a light passage area through which the light of the LED passes. The light irradiating device includes a substrate (205), a plurality of light emitting diode elements (210) disposed on a surface of the substrate (205), a cooling unit which is disposed on a rear surface of the substrate (205) and cools the substrate (205, 207) and the plurality of light emitting diode elements (210), an inner wall (300) which is disposed to enclose a light passage area through which light of the plurality of light emitting diode elements passes, a housing (100) which accommodates the substrate (205), the plurality of light emitting diode elements, the cooling unit, and the inner wall (300) and generates a space between the inner wall and the housing, an air inlet (404B) which introduces air in the light passage area onto the rear surface of the substrate (205), a flow channel which passes through the rear surface of the substrate (205) and connects the air inlet (404B) and the space, and a circulation port (301) which is provided to discharge the air in the space to the light passage area, wherein the cooling unit cools the air introduced in the air inlet (404B), and the air is convected between the light passage area and the space.