Phosphor Wheel Heat-Dissipating Module for Laser Projection
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Solution Overview
Problem
Current laser projection systems face challenges in effectively dissipating heat from phosphor wheels without increasing the system's volume, leading to restricted luminance and noise issues due to the limitations of motor size and airflow inefficiency.
Innovation Solution
A phosphor wheel heat-dissipating module incorporating a phosphor wheel with air vents and an impeller, which utilizes airflow to remove heat from the phosphor wheel's outer-ring portion, enhancing heat dissipation efficiency and reducing temperature non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the area of the phosphor wheel is increased to meet luminance requirements, then the energy absorbed by the phosphor agent per unit time is increased, but the system space and motor size are correspondingly increased
Solution Approach 1:
The patent introduces a blowing device that directs airflow through air vents onto the phosphor wheel surface. This pneumatic approach enables efficient heat dissipation without requiring an increased phosphor wheel area, thereby maintaining compact system space while still accommodating high energy input from the laser light source.
Solution Approach 2:
The patent changes the thermal management parameters by introducing forced convection through controlled airflow. By adjusting airflow velocity and distribution patterns, the system can dissipate heat more effectively from a compact phosphor wheel, allowing high energy absorption without proportional increases in system volume.
2Temperature
If the rotating speed of the motor is increased to maintain high speed rotation of the phosphor wheel, then the heat-dissipating efficacy is improved, but the noise and motor complexity are increased
Solution Approach 1:
The patent introduces airflow as an intermediary heat transfer medium. Instead of relying solely on high-speed rotation for heat dissipation, the blowing device creates a controlled airflow field that acts as an intermediary to carry heat away from the phosphor wheel. This allows effective heat dissipation at lower rotational speeds, reducing noise and motor complexity.
Solution Approach 2:
The patent employs pneumatic principles by using a blowing device to generate controlled airflow. This pneumatic heat dissipation mechanism provides an alternative to purely mechanical rotation-based cooling, enabling effective thermal management with reduced motor speed requirements and associated noise.
3Use of energy by moving object
If the area of the phosphor wheel is increased, then the optical path is increased, but the balance of the phosphor wheel becomes difficult to maintain
Solution Approach 1:
The patent enables the phosphor wheel to self-regulate thermal effects through the airflow mechanism. The blowing device creates airflow patterns that naturally adapt to the wheel's rotation, providing stable thermal management without requiring increased wheel area. This maintains the wheel's balance and rotational stability while still achieving high energy absorption.
4Temperature
If the phosphor wheel is rotated at high speed, then the energy absorption is reduced, but the heat-dissipating efficacy is achieved, however the airflow cannot be effectively driven due to circular disc profile
Solution Approach 1:
The patent employs a blowing device that generates controlled airflow independent of the phosphor wheel's rotational speed. This pneumatic system directly drives airflow through air vents onto the wheel surface, effectively decoupling heat dissipation performance from rotation speed. The circular disc profile no longer limits airflow effectiveness since the blowing device actively generates the required air movement.
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 module effectively reduces the local temperature of the phosphor wheel, allowing it to withstand higher energy laser beams without area increase, enhancing luminance and reducing system volume while minimizing noise.
Implementation Method 1
a second portion of the airflow is transferred to the first surface of the phosphor wheel through the air vents, thereby removing heat from the phosphor wheel
Implementation Method 2
The impeller is disposed on the second surface of the phosphor wheel... A first portion of the airflow is blown out through the first outlet, and a second portion of the airflow is transferred to the first surface of the phosphor wheel through the air vents
Data Source
AI summary
A phosphor wheel heat-dissipating module for a laser projection system is provided. The phosphor wheel heat-dissipating module includes a phosphor wheel, a plurality of air vents and an impeller. At least one phosphor agent is coated on an outer-ring portion of a first surface of the phosphor wheel. The air vents run through the phosphor wheel. The impeller is disposed on a second surface of the phosphor wheel, and includes an inlet and a first outlet. A laser beam is projected on the outer-ring portion of the phosphor wheel. When the phosphor wheel is rotated at a high rotating speed, an airflow is inhaled into the impeller through the inlet. A first portion of the airflow is blown out through the first outlet, and a second portion of the airflow is transferred to the first surface of the phosphor wheel through the air vents.