Phosphor Wheel Balance Ring Structure for Vibration and Noise Reduction

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Solution Overview

Problem

Phosphor wheels in projectors experience significant unbalance due to uneven distribution of phosphors, leading to increased processing time for dynamic balancing, risk of balancing mass falling off, and enhanced vibrations and noise.

Innovation Solution

A wavelength conversion device with a balance ring featuring protrusions or recesses to compensate for structural imbalance, reducing the weight and adhesive needs for balancing masses and positioning them above air gaps to minimize heat transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If phosphors with different colors/densities are distributed on the phosphor wheel to meet project requirements, then the device can satisfy different project requirements, but the phosphor wheel has considerable unbalance requiring more processing time and correction times in dynamic balancing processes

Engineering Contradiction:

Improveability to meet different project requirementsVSAvoidprocessing time and number of correction times in dynamic balancing

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the balance ring with specifically positioned balancing masses during manufacturing, rather than performing balancing corrections after the phosphor wheel is assembled. This advance preparation eliminates the need for multiple dynamic balancing correction iterations, significantly reducing processing time while maintaining the ability to meet different project requirements through proper initial design

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The balance ring is designed to be self-balancing through its structural features - the ring itself contains integrated balancing masses positioned at specific locations that automatically compensate for the unbalance caused by non-uniform phosphor distribution. This self-service mechanism eliminates the need for external balancing operations and multiple correction cycles

Inventive Principle:

Principle #25Self-service

2Stability of the object's composition

If adhesive is used to fix the balancing mass to the balance ring, then the balancing mass is secured, but the amount of adhesive needed increases and heat transfer from the base plate to the balancing mass is enhanced

Engineering Contradiction:

Improvefixing reliability of balancing massVSAvoidheat transfer to balancing mass

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The patent extracts the adhesive layer from the system by making the balance ring and balancing masses as an integrated component. This removal of the adhesive intermediary eliminates both the need for large amounts of adhesive and the thermal conduction path that adhesive provides, thereby reducing heat transfer to the balancing mass while maintaining securing reliability through the integrated structure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the chemical bonding mechanism (adhesive) with a mechanical integration approach where the balancing masses are formed as part of the balance ring structure. This substitution eliminates the thermal conduction pathway provided by adhesive while maintaining the securing function through structural integration rather than chemical bonding

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution reduces processing time and number of correction times in dynamic balancing, prevents balancing mass from falling off, decreases adhesive usage, and minimizes heat transfer, thereby reducing vibrations and noise.

Implementation Method 1

the balance ring has a balancing part, and the balancing part includes at least one of the following structures: (1) a protrusion formed by a part of an outer periphery of the balance ring protruding in a direction away from the rotation shaft; (2) a recess formed by a part of the outer periphery of the balance ring caving in a direction towards the rotation shaft

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

because the balancing mass may be positioned above an air gap between the base plate and the balance ring to lengthen a heat conduction path between the base plate and the balancing mass, the amount of heat transferred from the base plate to the balancing mass via the adhesive can be reduced

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12243968B2Wavelength conversion device

Publication Date: 2025.03.04 CORETRONIC CORPORATION

AI summary

A wavelength conversion device includes a base plate, at least one wavelength conversion material layer and a balance ring. The base plate has a geometric center, the wavelength conversion material layer is disposed on the base plate, and the balance ring is disposed on the base plate and rotates about a rotation shaft. The balance ring has a balancing part, and the balancing part includes at least one of the following structures: (1) a protrusion formed by a part of an outer periphery of the balance ring protruding in a direction away from the rotation shaft; (2) a recess formed by a part of the outer periphery of the balance ring caving in a direction towards the rotation shaft.