Wavelength Conversion Wheel Surface Roughness for Balance Weight Adhesion
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Solution Overview
Problem
The reliability of phosphor wheels in projection devices using laser diodes is compromised due to insufficient adhesion strength between the phosphor wheel and balancing glue, leading to potential imbalance and malfunction during high-speed rotation.
Innovation Solution
A wavelength conversion wheel design featuring a turnable disc with an anodized layer on the pressure ring, where the surface roughness is 1 μm to 10 μm, enhancing the adhesion strength between the anodized layer and the balance weight, thereby preventing the balance weight from dropping out during high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If balancing glue is added to the phosphor wheel to prevent imbalance during high-speed rotation, then the stability of the phosphor wheel is improved, but the adhesion strength between the phosphor wheel and balancing glue is insufficient, leading to potential dropping out during rotation
Solution Approach 1:
The invention changes the surface roughness parameter of the pressure ring from a conventional smooth surface to a specific roughness range of 1-10 μm. This parameter change creates micro-structures on the surface that mechanically interlock with the balancing glue, significantly enhancing adhesion strength and preventing the balance weight from dropping out during high-speed rotation.
Solution Approach 2:
The invention applies local quality modification by creating a roughened surface layer (anodized layer) specifically on the pressure ring where the balancing glue is applied. This localized rough surface treatment is confined to the bonding area, providing enhanced adhesion only where needed, while the rest of the phosphor wheel maintains its original smooth surface properties.
2Productivity
If the phosphor wheel rotates at high speed to achieve projection function, then the productivity of the projection device is improved, but the insufficient adhesion causes the balance weight to drop out, affecting reliability
Solution Approach 1:
By modifying the surface roughness parameter to 1-10 μm, the invention creates optimal mechanical interlocking conditions that can withstand the centrifugal forces generated during high-speed rotation, ensuring the balance weight remains securely attached while maintaining high rotation speeds for efficient projection.
Solution Approach 2:
The invention creates a composite structure consisting of the pressure ring, anodized layer, and balancing glue working together as an integrated system. The anodized layer serves as an intermediate bonding phase that combines the structural integrity of the metal pressure ring with the adhesive properties of the balancing glue, forming a reliable composite assembly capable of withstanding high-speed operation.
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 improved adhesion strength increases the reliability of the wavelength conversion wheel by more than 28% compared to conventional designs, ensuring stable operation and reducing the risk of imbalance.
Implementation Method 1
The anodized layer is disposed on the first surface. The balance weight is disposed on the anodized layer, wherein the surface roughness of the anodized layer is 1 μm to 10 μm.
Data Source
AI summary
A wavelength conversion wheel includes a turnable disc, a wavelength conversion layer, a pressure ring, an anodized layer and a balance weight. The turnable disc has an inner ring portion and a ring-shaped irradiation portion. The ring-shaped irradiation portion is connected to an outer edge of the inner ring portion. The ring-shaped irradiation portion includes a wavelength conversion region. The wavelength conversion layer is disposed on the wavelength conversion region. The pressure ring presses against the inner ring portion and has a first surface facing away the turnable disc. The anodized layer is disposed on the first surface. The balance weight is disposed on the anodized layer, wherein the surface roughness of the anodized layer is 1 μm to 10 μm. The wavelength conversion wheel of the invention has better reliability. A projection device with the wavelength conversion wheel is further provided.