Wearable Housing Coupling to Prevent Electrostatic Discharge

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Solution Overview

Problem

Wearable devices with metal components are susceptible to electrostatic discharge (ESD) leading to dielectric breakdown and potential harm to users and internal components.

Innovation Solution

Incorporating an electrical connection component to galvanically couple the inner and outer metal housings of wearable devices, maintaining equal electrostatic potential and preventing dielectric breakdown.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If insulating materials are used to electrically isolate the inner and outer metal housings, then wireless signal propagation is enabled, but electrostatic discharge occurs causing dielectric breakdown and potential damage to internal components

Engineering Contradiction:

Improvewireless signal propagationVSAvoidprotection from electrostatic discharge

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

A conductive intermediary component is introduced between the inner and outer metal housings to establish an electrical connection. This conductive bridge allows electrostatic charge equalization while maintaining wireless signal propagation through the insulating housing structure, thereby preventing dielectric breakdown without compromising communication functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inner and outer metal housings are electrically connected through a conductive component to maintain equal electrostatic potential between them. This equipotential condition eliminates the voltage difference that causes dielectric breakdown, allowing the insulating materials to maintain their protective function while preventing electrostatic discharge damage

Inventive Principle:

Principle #12Equipotentiality

2Adaptability or versatility

If the inner and outer metal housings are electrically isolated, then wireless signals can propagate through the housing, but the housings develop different electrostatic potentials leading to dielectric breakdown

Engineering Contradiction:

Improvewireless signal transmissionVSAvoidelectrostatic potential difference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A conductive intermediary component serves as a mediator between the inner and outer metal housings, providing a controlled electrical path for charge equalization. This intermediary allows the housings to maintain wireless signal transmission capability while eliminating harmful electrostatic potential differences through controlled conductivity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical conductivity parameter between the inner and outer housings is changed from zero (complete isolation) to a controlled non-zero value through the conductive component. This parameter change enables charge equalization and eliminates electrostatic potential differences while preserving wireless signal propagation through the housing structure

Inventive Principle:

Principle #35Parameter changes

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

Prevents damage to internal components and reduces the risk of electrostatic shocks by equalizing electrostatic potential between the inner and outer housings, thereby safeguarding the device and user.

Implementation Method 1

the inner metal housing, the outer metal housing, and internal components may be electrically isolated from one another using one or more insulating materials. However, the electrical (e.g., galvanic) isolation of the respective conductive components may result in the conductive components developing different electrostatic charges or potentials. These varying electrostatic potentials may result in electrostatic discharge (ESD) and dielectric breakdown

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Implementation Method 2

an electrical connection component configured to reduce a difference in an electrical potential between the inner housing component and the outer housing component by electrically coupling the inner housing component and the outer housing component

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250234499A1Electrostatic discharge protection for wearable devices

Publication Date: 2025.07.17 OURA HEALTH OY

AI summary

Methods, systems, and devices for protecting wearable devices from electrostatic discharge are described. A wearable device may include an inner housing and an outer housing that include electrically-conductive materials. The wearable device may include a printed circuit board (PCB) disposed at least partially between the inner housing and the outer housing, the PCB including one or more sensors configured to acquire physiological data from the user through one or more apertures within the inner housing. The wearable device may include an electrical connection component configured to reduce a difference in an electrical potential between the inner housing and the outer housing by electrically coupling the inner housing and the outer housing.