Pressure Sensor Cap With Offset Openings Against Contaminants

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Solution Overview

Problem

Pressure sensors in wearable and portable devices are susceptible to damage and parametric shifts due to environmental contaminants and mechanical failures, such as high-velocity water and probing, when directly exposed.

Innovation Solution

A protective cap with offset openings is used over the pressure sensor, which is protected by a waterproofing medium, preventing direct exposure to contaminants and hazards while allowing pressure measurement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pressure sensor is directly exposed to the environment to measure pressure, then the measurement function is enabled, but the sensor becomes susceptible to damage and parametric shifts due to contaminants and mechanical failures

Engineering Contradiction:

Improvesensor integrityVSAvoidexposure to contaminants

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A protective cap with offset openings is introduced as an intermediary element between the environment and the pressure sensor. The cap includes a waterproofing medium that blocks contaminants while allowing pressure transmission, and the offset openings are positioned away from the port to prevent direct ingress of water and debris while maintaining pressure sensing capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

A waterproofing medium in the form of a flexible membrane or coating is applied to protect the pressure sensor. This thin film barrier prevents contaminants from reaching the sensor while allowing pressure changes to be transmitted through it, maintaining both protection and functionality

Inventive Principle:

Principle #30Flexible shells and thin films

2Object-affected harmful factors

If a waterproof membrane or mesh is used to protect the pressure sensor, then protection from contaminants is improved, but the structure becomes susceptible to mechanical failure under high velocity water or probing

Engineering Contradiction:

Improveprotection from contaminantsVSAvoidresistance to mechanical failure

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The protective structure is segmented into multiple functional layers: a rigid protective cap that provides mechanical strength and structural integrity, and a waterproofing medium that provides contamination protection. This segmentation allows each layer to specialize in its primary function without compromising the other

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protective structure combines different materials with complementary properties: a rigid cap material (such as metal or hard polymer) for mechanical strength, and a waterproofing medium (such as silicone or polymer coating) for chemical and water resistance. This composite approach provides both protection from contaminants and resistance to mechanical failure

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If the pressure sensor is encapsulated with a waterproof medium, then protection from contaminants is achieved, but mechanical failure modes such as damage from high velocity water or probing remain

Engineering Contradiction:

Improveprotection from water and chemicalsVSAvoidresistance to high velocity water

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The protective cap is designed with offset openings positioned away from the port, creating a buffer zone that prevents direct impact of high velocity water or probing objects from reaching the pressure sensor. This beforehand cushioning absorbs or deflects mechanical threats before they can compromise the sensor

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 errors in pressure readings by minimizing direct exposure to contaminants and mechanical damage, maintaining sensor integrity and accuracy.

Implementation Method 1

A protective cap with offset openings is used over the pressure sensor, which is protected by a waterproofing medium

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS12590858B2Protective cap for pressure sensors

Publication Date: 2026.03.31 APPLE INC

AI summary

Aspects of the subject technology relate to an apparatus having a housing including a port exposed to an environment. A pressure sensor is disposed within the housing to measure a pressure of the environment. A medium partially fills a sensor cavity or is coated over the pressure sensor, and a cap including multiple openings is disposed over the pressure sensor. The openings of the cap are arranged to be offset from the port.