Doorbell Camera Active Cooling Using Ultrasonic Fluid Flow

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Solution Overview

Problem

Existing electronic devices, such as mini PCs, doorbell cameras, and LED lighting systems, face challenges with passive cooling solutions that are bulky, heavy, and inadequate for managing heat, especially when enhanced computing performance is desired, and active cooling solutions like fans introduce vibration and noise.

Innovation Solution

A doorbell system with a housing and active cooling cells that utilize vibrational motion to drive a fluid for heat transfer, featuring a top plate, orifice plate, and cooling elements to achieve high-speed fluid flow without backflow, suitable for devices with limited space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If passive cooling with heat sinks is used, then dust accumulation and vibration are reduced, but cooling effectiveness is insufficient for high-performance devices

Engineering Contradiction:

Improvecooling effectivenessVSAvoiddust accumulation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs ultrasonic vibration at frequencies between 20-100 kHz to drive fluid flow through the heat dissipation structure. This high-frequency vibration creates acoustic streaming effects that generate continuous fluid circulation without mechanical moving parts, achieving effective cooling while avoiding dust accumulation and vibration issues associated with traditional fans

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent replaces traditional mechanical fan-based cooling systems with an ultrasonic vibration-driven fluid circulation system. This substitution eliminates mechanical contact and moving parts while achieving active cooling through acoustic field effects, resolving the contradiction between cooling effectiveness and dust-free operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If fan-based active cooling is used, then cooling effectiveness is improved, but vibration, noise, and dust accumulation are introduced

Engineering Contradiction:

Improvecooling effectivenessVSAvoidvibration and noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent utilizes ultrasonic vibration frequencies (20-100 kHz) that are imperceptible to human hearing, eliminating audible noise while maintaining effective fluid circulation. The high-frequency oscillations create acoustic radiation pressure that drives continuous fluid flow without the mechanical vibration and noise associated with traditional fans

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent replaces mechanical fan rotation with ultrasonic vibration-driven acoustic streaming. This substitution eliminates mechanical contact, bearing friction, and rotational imbalance that cause vibration and noise in traditional cooling systems, achieving silent and vibration-free operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If traditional passive cooling is used, then device size can be reduced, but heat dissipation capability is insufficient for enhanced processing

Engineering Contradiction:

Improveprocessing speedVSAvoidheat generation

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent employs ultrasonic vibration to create acoustic streaming that enhances convective heat transfer coefficients. The high-frequency oscillations disrupt thermal boundary layers and promote efficient heat removal from processing components, enabling sustained high-performance operation without excessive heat accumulation

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent utilizes fluid circulation driven by ultrasonic vibration to actively remove heat from high-performance processing components. The acoustic field generates continuous fluid flow that efficiently transports heat away from heat-generating elements, enabling enhanced processing capabilities while maintaining acceptable temperature levels

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 active cooling system effectively transfers heat from heat-generating structures, enabling faster processing and higher resolution capabilities in devices like doorbell cameras and mini PCs without the drawbacks of traditional cooling methods.

Implementation Method 1

The cooling element is configured to utilize vibrational motion when driven to draw a fluid into each active cooling cell

Methodology Applied

Scientific EffectVibrational motion: Vibration

Implementation Method 2

The active cooling cell(s) are configured to utilize vibrational motion to drive a fluid for transferring heat from the heat-generating structure

Methodology Applied

Scientific EffectHeat transfer: Convection

Data Source

PatentUS12492118B2Doorbell camera having active cooling

Publication Date: 2025.12.09 FRORE SYSTEMS INC

AI summary

A doorbell system is disclosed. The doorbell system includes a housing, a heat-generating structure, and a cooling system. The housing is configured to be coupled to a structure. The heat-generating structure and cooling system are coupled with the housing. The cooling system includes at least one active cooling cell. The heat-generating structure may be thermally coupled with the cooling system. The active cooling cell(s) are configured to utilize vibrational motion to drive a fluid for transferring heat from the heat-generating structure. The cooling system is coupled with and contained by the housing.