Asymmetric Phosphor Wheel Balancing for Laser Projectors
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Solution Overview
Problem
Current laser projectors face structural imbalance and vibration issues due to the use of balancing sheets, which lead to noise and reduced lifetime of the driving unit during high-speed rotation.
Innovation Solution
A wavelength conversion device with a ring-shaped or asymmetrical assembly member is integrated, where the assembly member is located on the same side as the driving unit and surrounds it, eliminating the need for a balancing sheet and ensuring structural balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a balancing sheet is added to improve structural balance, then structural balance is improved, but device complexity and noise increase
Solution Approach 1:
The patent applies asymmetry by designing the phosphor wheel with an asymmetric thickness distribution. The phosphor wheel has a first region with a first thickness and a second region with a second thickness that is different from the first thickness. This asymmetric structure inherently balances the phosphor wheel without requiring an additional balancing sheet, thereby improving structural balance while reducing device complexity
Solution Approach 2:
The patent merges the balancing function into the phosphor wheel structure itself by making it asymmetric. Instead of adding a separate balancing sheet as an independent component, the balancing function is integrated into the phosphor wheel's own structure through variable thickness design, thus eliminating the need for additional components
2Stability of the object's composition
If a balancing sheet is added to improve structural balance, then structural balance is improved, but noise and vibration increase
Solution Approach 1:
The asymmetric thickness design of the phosphor wheel creates inherent structural balance that reduces vibration and noise during rotation. By carefully designing the asymmetric structure, the patent achieves balance without the need for additional balancing components that would generate wind shear and resistance forces, thereby reducing noise and vibration
3Stability of the object's composition
If a balancing sheet is added to improve structural balance, then structural balance is improved, but the lifetime of the driving unit decreases
Solution Approach 1:
The asymmetric phosphor wheel structure achieves structural balance inherently, eliminating the need for a separate balancing sheet. This reduces the overall weight and complexity of the rotating assembly, decreasing the load on the driving unit's rotation shaft and thereby extending its lifetime and improving reliability
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
This configuration reduces noise and wind resistance, extends the lifetime of the driving unit, and maintains structural balance without additional components, enhancing the projector's performance.
Implementation Method 1
The at least one wavelength conversion material layer is disposed on the substrate and located in the first region and configured to convert a wavelength of the excitation beam
Data Source
AI summary
The invention provides a wavelength conversion device and a projector. The wavelength conversion device is configured to receive an excitation beam and includes a substrate, at least one wavelength conversion material layer, a driving unit and an assembly member. The substrate has a first region and a second region disposed adjacent to each other. The at least one wavelength conversion material layer is disposed on the substrate and located in the first region and configured to convert a wavelength of the excitation beam. The driving unit includes a rotation shaft. The driving unit is connected to the substrate and configured to drive the substrate to rotate with the rotation shaft as an axial center. The assembly member is disposed on the substrate, and the substrate drives the assembly member to rotate. A thickness or a shape of the assembly member is asymmetrical in a radial direction.