Wavelength-Converting Wheel Heat Insulation for Balance Stability
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Solution Overview
Problem
The high cost of high-brightness red and green laser diodes in projection apparatuses leads to the use of blue laser diodes to excite phosphor wheels, causing heat-related issues with balance glue, which can deteriorate and lead to imbalance and instability in the phosphor wheel during high-speed rotation.
Innovation Solution
A wavelength-converting wheel with a heat insulation structure, including an air layer between the pressing ring and the inner ring portion, reduces heat transmission to the balance block, preventing deterioration and ensuring stability during high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If balance glue is added to the phosphor wheel to prevent shaking during high-speed rotation, then the stability of the phosphor wheel is improved, but the balance glue deteriorates when the phosphor wheel is overheated by laser diode irradiation
Solution Approach 1:
A heat insulation structure (air layer) is introduced as an intermediary between the wavelength-converting region and the balance block to block heat transmission. This mediator protects the balance glue from thermal deterioration while maintaining its stabilizing function, resolving the contradiction between stability and reliability.
2Productivity
If the phosphor wheel rotates at high speed to achieve projection function, then the productivity is improved, but the balance glue may fly away due to heat deterioration
Solution Approach 1:
The heat insulation structure is installed in advance to prevent heat from reaching the balance glue before high-speed rotation begins. This prior protection ensures the balance glue maintains its adhesion and preventing it from flying away during high-speed operation, thus maintaining both productivity and reliability.
3Ease of manufacture
If blue laser diode is used to excite phosphor powder to generate yellow and green light, then the cost is reduced, but heat is generated that causes balance glue deterioration
Solution Approach 1:
The air layer acts as a thermal insulator and intermediary, blocking the heat generated by blue laser diode excitation from reaching the balance glue. This allows the cost-effective blue laser diode solution to be used while protecting against thermal deterioration through the heat insulation structure.
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 heat insulation structure enhances the reliability of the wavelength-converting wheel by preventing heat-induced deterioration and imbalance, ensuring stable operation and extending the service life of the phosphor wheel.
Implementation Method 1
A heat insulation structure is disposed in a projection direction where the first balance block is projected on the inner ring portion
Implementation Method 2
The wavelength-converting region is configured to convert the excited beam into a converted beam
Data Source
AI summary
A wavelength-converting wheel includes a motor, a turntable, a pressing ring, a first balance block and an adhesive layer. The motor has a rotating shaft. The turntable has an inner ring portion and an annular irradiation portion. The inner ring portion is sleeved on the rotating shaft. The annular irradiation portion is connected to an outer edge of the inner ring portion. The pressing ring is sleeved on the rotating shaft and pressed and abutted against the inner ring portion. The pressing ring has a first surface and a second surface. The second surface faces the inner ring portion. The first balance block is disposed on the first surface. The adhesive layer is adhered between the second surface of the pressing ring and the inner ring portion. A heat insulation structure is disposed in the projection direction where the first balance block is projected on the inner ring portion.