Laser Projector Phosphor Cooling via Circulatory Air Channel
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Solution Overview
Problem
Conventional laser projectors face the issue of phosphor deterioration due to high temperatures caused by intense laser light, leading to decreased illuminating efficiency as brightness requirements increase.
Innovation Solution
An optical device with a circulatory air channel and a thermoelectric cooling system that provides cold air to cool the phosphor wheel, enhancing cooling efficiency and preventing dust pollution by recycling cleaner air within the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the energy carried by the laser light beam is intensified to meet brightness requirements, then the illuminating efficiency is improved, but the temperature of the phosphor wheel increases causing phosphor deterioration
Solution Approach 1:
The cooling system is segmented into multiple functional components: a thermal exchanger with cold and hot sides, circulatory air channels divided into cooling channels and exhaust channels, and multiple fans for different airflow functions. This segmentation allows efficient heat transfer from the phosphor wheel while maintaining separate pathways for cooling air and exhaust air.
Solution Approach 2:
The patent introduces air as an intermediary cooling medium between the laser light source/phosphor wheel and the external environment. The air is circulated through the cooling channels, absorbing heat from the phosphor wheel, then transported to the thermal exchanger for heat dissipation before being exhausted or recirculated.
2Reliability
If conventional cooling methods are used, then the structure is simple, but the cooling efficiency is insufficient to prevent phosphor damage
Solution Approach 1:
The cooling system merges multiple functions into an integrated structure: the thermal exchanger combines heat absorption and dissipation functions, the circulatory air channels combine cooling and exhaust pathways, and the system integrates laser light source, phosphor wheel, and cooling components into a unified optical device assembly.
Solution Approach 2:
The cooling air is pre-cooled by the thermal exchanger before being directed to the phosphor wheel, ensuring that the cooling medium is at optimal temperature before contact with the hot phosphor surface, thereby maximizing heat transfer efficiency from the outset.
3Object-affected harmful factors
If outside air is used for cooling, then the air supply is simple, but dust pollution enters the projection system
Solution Approach 1:
The system recirculates cooling air within the device after it has been cooled by the thermal exchanger, rather than continuously introducing outside air. The exhaust channels provide an optional pathway for air discharge, but the primary cooling function uses recovered air from within the device, preventing dust entry while maintaining effective cooling.
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 phosphor damage from high temperatures and improves cooling efficiency, maintaining the brightness requirements while reducing dust-related pollution.
Implementation Method 1
the thermal exchanger can be a thermoelectric cooling chip, the thermoelectric chip has a cold side and a hot side, the cold side is disposed in the circulatory air channel
Implementation Method 2
a cooling fan disposed adjacent to the hot side for dissipating heat from the hot side
Implementation Method 3
an air guiding component disposed in the circulatory air channel for guiding an air provided by the thermal exchanger toward the phosphor wheel
Data Source
AI summary
An optical device utilized in a laser projector includes a circulatory air channel, a phosphor wheel disposed in the circulatory air channel, a thermal exchanger partially disposed in the circulatory air channel, and an air guiding component disposed in the circulatory air channel for guiding an air provided by the thermal exchanger toward the phosphor wheel. The temperature of the air passing through the phosphor wheel is lower than an environment temperature.