Phosphor Wheel Mass Imbalance and Heat Dissipation
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Solution Overview
Problem
Existing phosphor wheels in field sequential projection systems face challenges in reducing mass distribution imbalance, particularly when large openings are present, which can affect the balance and heat dissipation, leading to potential deterioration of the phosphor particles and reduced reliability.
Innovation Solution
A phosphor wheel design featuring a substrate with a disk shape, a phosphor layer curved along the circumferential direction, heat dissipation fins on the opposing surface, and strategically positioned projections to counterbalance the mass distribution imbalance, ensuring effective heat dissipation and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large openings are provided in the phosphor wheel substrate, then light transmission is improved, but mass distribution imbalance increases
Solution Approach 1:
The patent applies the counterweight principle by providing a balance weight in the central member of the phosphor wheel substrate. The balance weight is positioned to counterbalance the mass distribution imbalance caused by large openings in the substrate, thereby maintaining rotational balance while allowing sufficient light transmission through the openings.
2Temperature
If heat dissipation fins are added to the substrate, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat dissipation function with the existing substrate structure by integrally forming heat dissipation fins on the substrate. This integration approach improves heat dissipation capability while avoiding the increased device complexity that would result from adding separate heat dissipation components.
Solution Approach 2:
The substrate is designed to serve multiple functions: it provides structural support, enables light transmission through openings, and dissipates heat through integrally formed fins. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving effective heat dissipation.
3Manufacturing precision
If the phosphor layer is positioned along the circumferential direction, then color separation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent positions the phosphor layer along the circumferential direction of the rotating substrate, creating a curved arrangement that follows the rotational path. This curved configuration improves color separation precision by ensuring proper spatial positioning of different phosphor materials, while the modular substrate design helps manage manufacturing complexity.
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 design effectively reduces mass distribution imbalance, enhances heat dissipation, and improves the reliability of the phosphor wheel by preventing overheating and structural weaknesses, while maintaining the integrity of the phosphor layer and substrate.
Implementation Method 1
a heat dissipation fin that is provided on the second main surface
Implementation Method 2
a heat dissipation fin that is provided on the second main surface
Implementation Method 3
a phosphor layer that has a curved shape and is provided along a circumferential direction of the substrate on the first main surface
Data Source
AI summary
A phosphor wheel includes a substrate that has a disk shape, and includes a first main surface, a second main surface opposite to the first main surface, and an opening, a phosphor layer that has a curved shape and is provided along a circumferential direction of the substrate on the first main surface, the phosphor layer being provided side by side with the opening in the circumferential direction in plan view, a heat dissipation fin that is provided on the second main surface, and a projection that is provided on the second main surface, and is different from the heat dissipation fin. The heat dissipation fin and the projection are disposed integrally with the substrate.