Sealed Wavelength Conversion Device Dust Prevention Heat Dissipation
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Solution Overview
Problem
Conventional illumination and projection systems face challenges with heat accumulation and dust contamination in wavelength conversion materials, leading to reduced light emission efficiency and shortened component life, as high light power density causes quenching and dust absorption, making it difficult to simultaneously achieve effective heat dissipation and dust prevention.
Innovation Solution
A wavelength conversion device is designed with a sealed box and conduit system that includes a heat exchanger and air circulation device to maintain a low working temperature and prevent dust accumulation, using a substrate and filter plates to optimize light transmission and reflection, and employing various fan types for efficient air exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the wavelength conversion layer operates in an open environment, then heat dissipation is facilitated, but dust accumulates on the layer and optical components, increasing light energy absorption and causing burning and darkening
Solution Approach 1:
The patent employs a sealed box structure with transparent windows to enclose the wavelength conversion layer, creating a protected environment that prevents dust accumulation while allowing optical transmission. The sealing mechanism isolates the conversion layer from external dust particles.
Solution Approach 2:
The patent introduces an air circulation system with filters as intermediaries between the external environment and the wavelength conversion layer. The filters trap dust particles while allowing air flow to carry heat away from the conversion layer, thus mediating between dust prevention and heat dissipation requirements.
2Power
If the light power density of the excitation light is increased, then the output light power is enhanced, but the wavelength conversion material experiences quenching effect, dramatically decreasing light emitting efficiency
Solution Approach 1:
The patent employs a rotating wavelength conversion layer to dynamically distribute the excitation light across different areas of the conversion material. This rotation prevents any single area from experiencing continuous high-intensity illumination, thereby reducing quenching effects while maintaining overall output power.
Solution Approach 2:
The patent divides the wavelength conversion layer into multiple segments or zones that can be independently managed. By rotating or moving different segments through the excitation light path, the system distributes the high power density across time and space, preventing localized quenching while maintaining total output power.
3Object-affected harmful factors
If the wavelength conversion layer is sealed to prevent dust, then dust accumulation is prevented, but heat dissipation becomes more difficult
Solution Approach 1:
The patent introduces an air circulation system with filters as intermediaries between the sealed environment and the external environment. The filtered air flow carries heat away from the wavelength conversion layer while the sealing prevents dust particles from entering the enclosed space.
Solution Approach 2:
The patent uses transparent sealed windows and flexible sealing mechanisms that allow thermal energy transmission while blocking dust particles. The sealing structure is designed to be permeable to heat flow but impermeable to dust particles.
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 prevents dust from affecting light emission and maintains a low temperature, thereby enhancing the light emission efficiency and extending the life of wavelength conversion materials while ensuring effective heat dissipation.
Implementation Method 1
A heat exchanger, for lowering the temperature of the air (or any gas) inside the conduit
Implementation Method 2
A wavelength conversion layer for absorbing an excitation light and generating a converted light
Implementation Method 3
An air circulation device, disposed in the sealed space formed by the box and the conduit, for driving air exchange between the box and the conduit
Data Source
AI summary
Disclosed are a wavelength conversion device and a light emitting device. The wavelength conversion device includes a wavelength conversion layer used for absorbing excitation light and generating converted light; a box having a first area used for transmitting the excitation light to the wavelength conversion layer and a second area used for transmitting the converted light, and further including an air outlet and an air inlet; a conduit, disposed outside the box and used for connecting the air inlet and the air outlet, so as to seal with the box the wavelength conversion layer in the box; a heat exchanger, used for decreasing a gas temperature in the conduit; and a gas circulation device, disposed in sealed space encircled by the box and the conduit, and used for driving exchange between gas in the box and gas in the conduit. The wavelength conversion device achieves both dust prevention and heat dissipation.