Piezoelectric Airflow Generator for Wearable Projection Heat Dissipation

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Solution Overview

Problem

Current wearable projection devices face challenges in heat dissipation, particularly when using natural convection, which increases size and weight, and forced convection, which is inefficient and prone to dust accumulation when used outdoors.

Innovation Solution

A wearable projection device design incorporating a vapor chamber and an airflow generator with a piezoelectric thin film, where the vapor chamber is connected to the optical engine module and the airflow generator is positioned on the vapor chamber, driven by a control module to introduce external cooling airflow for efficient heat dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If natural convection heat dissipation is adopted, then a larger surface area is required for heat dissipation, but the wearable projection device cannot achieve lightweight

Engineering Contradiction:

Improveheat dissipationVSAvoiddevice weight

Core Design Contradiction:

TemperatureVSWeight of moving object

Solution Approach 1:

The patent replaces the mechanical natural convection system with a piezoelectric thin film-based airflow generator. The piezoelectric thin film converts electrical energy directly into mechanical vibration to generate airflow, eliminating the need for large surface area natural convection structures and reducing device weight while maintaining effective heat dissipation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the heat dissipation mechanism from passive natural convection to active piezoelectric-driven airflow generation. By changing the operating parameters (using piezoelectric effect instead of thermal buoyancy), the system achieves efficient heat dissipation with a compact, lightweight design suitable for wearable devices.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If forced convection heat dissipation is adopted, then a blower and an axial fan are required, but the heat dissipation amount is low and efficiency is poor under the same volume and noise specification

Engineering Contradiction:

Improveheat dissipationVSAvoidheat dissipation efficiency

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

The patent replaces traditional mechanical blowers and axial fans with a piezoelectric thin film-based airflow generator. This substitution eliminates complex mechanical components, reduces noise, and improves heat dissipation efficiency by directly coupling electrical energy to airflow generation through the piezoelectric effect, achieving better performance within the same volume constraints.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Temperature

If forced convection heat dissipation is adopted, then dust covering the air outlet/inlet is likely to occur when used outdoors, but heat dissipation effect decreases

Engineering Contradiction:

Improveheat dissipationVSAvoiddust accumulation

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent uses the piezoelectric thin film to generate mechanical vibrations that create airflow for heat dissipation. This vibration-based approach generates controlled airflow patterns that can prevent dust accumulation by maintaining air movement across the air inlet and outlet, unlike static or low-velocity forced convection systems that allow dust to settle.

Inventive Principle:

Principle #18Mechanical vibration

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 achieves improved heat dissipation efficiency, reduces noise under the same power consumption, and maintains a lightweight and dust-proof structure, ensuring both effective cooling and high display quality.

Implementation Method 1

The airflow generator includes a piezoelectric thin film. The control module is configured to drive the piezoelectric thin film to vibrate

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

the cooling airflow from outside enters the containing space of the body through the air inlet, so as to cool the vapor chamber

Methodology Applied

Scientific EffectConvection cooling: Convection

Implementation Method 3

The vapor chamber is connected to the optical engine module

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS20250060602A1Wearable projection device

Publication Date: 2025.02.20 CORETRONIC CORPORATION

AI summary

A wearable projection device includes a body, an optical engine module, a heat-dissipation component, and a control module. The body has an air inlet, and a containing space connected to the air inlet. The optical engine module is disposed in the containing space. The heat-dissipation component disposed in the containing space is configured to dissipate heat from the optical engine module. The heat-dissipation component includes a vapor chamber and an airflow generator. The vapor chamber is connected to the optical engine module. The airflow generator is positioned on the vapor chamber, and the airflow generator includes a piezoelectric thin film. The control module is disposed on the body, electrically connected to the optical engine module and the airflow generator, and configured to drive the piezoelectric thin film to vibrate, so that an external cooling airflow enters the containing space through the air inlet to cool the vapor chamber.