Oil-Filled Pressure Sensor for Wearables
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Solution Overview
Problem
Conventional electronic devices with pressure sensors face challenges due to poor chemical resistance and susceptibility to water and contaminant infiltration, leading to degraded functionality and reduced lifespan.
Innovation Solution
The integration of an oil-filled pressure-sensing device within an electronic watch, featuring a hermetically sealed diaphragm and a chemically inert silicone oil medium, which shields the pressure sensor from environmental contaminants and provides accurate pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel-based pressure-sensing device is used, then the pressure sensor can measure pressure in gas or liquid environment, but the device has poor chemical resistance and is susceptible to water and contaminant infiltration
Solution Approach 1:
The patent introduces an oil-filled encapsulation as an intermediary medium between the pressure sensor and the external environment. The oil acts as a protective barrier that transmits pressure while blocking harmful substances like water and contaminants from reaching the sensor, thus resolving the contradiction between maintaining sensor functionality and preventing contamination.
Solution Approach 2:
The patent creates an inert environment by filling the encapsulation with oil, which provides a chemically resistant medium that protects the pressure sensor from degradation. This inert environment prevents chemical reactions and contamination while allowing the sensor to function accurately in various pressure conditions.
2Device complexity
If the pressure sensor is directly exposed to the environment, then the device structure is simple, but the sensor is susceptible to corrosion and degradation
Solution Approach 1:
The patent implements a nested structure where the pressure sensor is encapsulated within an oil-filled enclosure, which is itself integrated into the electronic device housing. This nested design protects the sensor from environmental damage while maintaining a compact overall structure, thus resolving the contradiction between structural simplicity and extended sensor lifespan.
3Object-affected harmful factors
If an oil-filled encapsulation is used to protect the pressure sensor, then the sensor is shielded from contaminants, but the device requires additional components and space
Solution Approach 1:
The patent merges the protective encapsulation with the device housing and integrates the oil-filled enclosure directly into the existing structure. By combining multiple functions (protection, pressure transmission, and structural support) into a unified design, the patent reduces overall complexity while maintaining effective contaminant protection.
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
This solution enhances the accuracy and durability of pressure sensing by isolating the sensor from corrosion, water, and contaminants, while allowing for compact design and increased interior space for other components.
Implementation Method 1
a diaphragm hermetically sealed to the enclosure
Implementation Method 2
a chemically inert silicone oil medium, which shields the pressure sensor from environmental contaminants
Implementation Method 3
a pressure sensor encapsulated by the sensing medium... configured to measure a pressure of the volume
Implementation Method 4
the channel is configured to equalize the pressure of the volume and a pressure of the external environment
Data Source
AI summary
An electronic device, such as a smart watch, incorporating a fluid-based pressure-sensing device is disclosed. The fluid-based pressure-sensing device includes an enclosure, a pressure sensor, a diaphragm and a sensing medium. The enclosure includes an opening and the pressure sensor is disposed inside the enclosure. The diaphragm hermetically seals the opening, and the sensing medium transfers a pressure exerted on the diaphragm to the pressure sensor. The sensing medium can be liquid oil filling a space of the enclosure, and the diaphragm is a polymer material. The pressure-sensing device may sense an environmental pressure, which may be used by the electronic device to modify its operations, change information that is displayed, and so on.