Rotation-Type Optical Module Balancing Ring Design

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Solution Overview

Problem

Current projection apparatuses experience significant vibrations and noise due to an unstable structure caused by an excessively high center of mass and inadequate balancing in the fluorescent color wheel, leading to resonance and deformation during high-speed rotation.

Innovation Solution

A rotation-type optical module is designed with a balancing ring positioned below the turntable, featuring an outer and at least one inner retaining wall, which includes a weight substance to adjust the center of mass and improve stability, thereby reducing vibrations and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If a metal ring is added to increase the weight of the fluorescent color wheel, then the center of mass can be modified, but the axial force increases and causes great vibration of the element body

Engineering Contradiction:

Improveweight of fluorescent color wheelVSAvoidvibration of element body

Core Design Contradiction:

Weight of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent uses a balancing ring with adjustable weight substances to create counterweights that offset the axial force generated by the metal ring. The balancing ring is positioned on the opposite side of the turntable from the metal ring, and weight substances can be added or removed to achieve dynamic balance, thereby reducing vibration during rotation.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent makes the balancing system dynamic by allowing weight substances to be adjusted on the balancing ring. This enables the center of mass to be dynamically balanced during rotation, allowing the system to adapt to different operating conditions and minimize vibration at various rotation speeds.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If a metal ring with only one axial turning retaining wall is used, then the structure is simpler, but the bonding area between optical elements and the metal ring is small, resulting in poor structural strength

Engineering Contradiction:

Improvestructure of metal ringVSAvoidbonding area between optical element and metal ring

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent segments the retaining structure by adding multiple inner retaining walls in addition to the outer retaining wall. This divides the bonding area into multiple sections, allowing optical elements to be bonded at different locations and increasing the overall bonding area and structural strength while maintaining a modular structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a single axial retaining wall to a multi-dimensional retaining structure with outer and inner retaining walls extending in different directions. This creates a three-dimensional bonding framework that increases the bonding area without significantly increasing structural complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Volume of moving object

If the outer diameter of the metal ring is kept small, then the structure is more compact, but the copper sheet can only be disposed on an inner ring part, reducing the effectiveness of the balancing mass

Engineering Contradiction:

Improveouter diameter of metal ringVSAvoideffectiveness of balancing mass

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent uses a nested structure with outer and inner retaining walls that create multiple bonding zones. This allows the turntable to effectively utilize the entire radial space for mounting balancing masses, maximizing the moment of inertia and balancing effectiveness within a compact outer diameter.

Inventive Principle:

Principle #7Nested doll (Nesting)

4Ease of manufacture

If balancing is completed with the center of mass falling in the turntable, then the metal ring position is simplified, but the axial force is larger and causes great vibration

Engineering Contradiction:

Improvepositioning of metal ringVSAvoidvibration during rotation

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent positions the balancing ring on the opposite side of the turntable from the metal ring to create a counterbalancing effect. The weight substances on the balancing ring generate counteracting forces that offset the axial force from the metal ring, reducing vibration while maintaining simple manufacturing positioning.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Data Source

PatentUS11589018B2Rotation-type optical module and projection apparatus

Publication Date: 2023.02.21 CORETRONIC CORPORATION

AI summary

A rotation-type optical module includes a driving element, a turntable, an optical material, a balancing ring, and a first weight substance. The driving element includes a body and a rotating shaft body. The turntable is sleeved on the rotating shaft body and includes a first surface and a second surface. The optical material is disposed on the first surface of the turntable. The balancing ring is disposed between the driving element and the turntable and includes a third surface and a fourth surface, and the third surface and the second surface face each other. The balancing ring includes an outer retaining wall and at least one inner retaining wall which protrude from the fourth surface, and the first weight substance abuts between the outer retaining wall and the at least one inner retaining wall. A projection apparatus including the foregoing rotation-type optical module is further provided.