Welded Counterweight for Phosphor Wheel Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed operation of phosphor wheels in laser projectors leads to vibration issues due to poor dynamic balance, exacerbated by adhesive materials with low temperature resistance used for counterweights, which degrade and cause contamination and imbalance.
Innovation Solution
A wavelength conversion element with a counterweight member welded to a substrate with high temperature resistance, eliminating the need for adhesive materials and improving balance benefits by allowing the counterweight to be positioned closer to the outer edge, reducing the unit weight and motor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive material is used to fix the counterweight block, then the counterweight can be attached to the phosphor wheel, but the adhesive material deteriorates at high temperature causing loss of viscosity and contamination
Solution Approach 1:
The patent replaces the adhesive material (chemical bonding) with a welding connection (thermal/metallic bonding) to fix the counterweight block to the phosphor wheel. This substitution eliminates the temperature resistance limitations of adhesive materials, allowing the counterweight to remain firmly attached even at high operating temperatures of 7200 rpm or higher.
2Stability of the object's composition
If the counterweight block is positioned close to the center of the phosphor wheel, then the structure is compact, but the rotation radius is small reducing balance benefits
Solution Approach 1:
The patent positions the counterweight block at the outer edge of the phosphor wheel rather than near the center, utilizing the radial dimension to maximize the rotation radius. This dimensional repositioning increases the leverage arm of the counterweight, enhancing its ability to compensate for imbalance while maintaining structural integrity through the welding connection.
3Reliability
If a heavier counterweight block is used to achieve dynamic balance, then the balance quality improves, but the weight load on the motor increases
Solution Approach 1:
The patent optimizes the parameters of the counterweight block, including its position at the outer edge (maximizing rotation radius) and its connection method (welding for firm attachment). These parameter changes allow for more efficient balance compensation, potentially reducing the required counterweight mass while maintaining dynamic balance quality and minimizing motor load.
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
Enhances the reliability of the wavelength conversion element and projection device by ensuring a firm fixation of the counterweight and improved balance, reducing the weight load on the motor and maintaining stability even at high temperatures.
Implementation Method 1
The counterweight member is welded to the first surface of the substrate
Data Source
AI summary
A wavelength conversion element includes a substrate, a counterweight member and a wavelength conversion layer. The substrate has a first surface and a second surface opposite to each other. The counterweight member is welded to the first surface of the substrate and protrudes from the first surface of the substrate. The wavelength conversion layer is disposed on the first surface or the second surface of the substrate. A projection device having the wavelength conversion element is also provided. The wavelength conversion element and the projection device provided by the invention have good reliability.