Laminated Pressure Sensor Protection Against Corrosive Ingress
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Solution Overview
Problem
Existing pressure sensors face reliability issues due to corrosion caused by permeation of corrosive substances, which affects accurate pressure detection, particularly in environments exposed to organic solvents and oils.
Innovation Solution
A pressure sensor device with a laminated protection structure comprising a first and second recessed portion filled with fluorine-based gels and a porous fluorine-based resin member, which prevents the ingress of corrosive substances and maintains accurate pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protection member (fluorine gel or fluorosilicone gel) is used to cover the pressure detection element, wire, and lead frame, then the structure is simple and manufacturing is easy, but corrosive substances can permeate into the protection member causing corrosion and reducing reliability
Solution Approach 1:
The protection structure is divided into multiple segments: a first protection member (fluorine gel) directly covering the pressure detection element, and a second protection member (resin coating) covering the first protection member. This segmentation allows each layer to perform specific protection functions, preventing corrosive substance permeation while maintaining structural organization.
Solution Approach 2:
The patent uses composite materials by combining fluorine gel (first protection member) with a resin coating (second protection member). This composite structure leverages the chemical resistance of fluorine gel and the impermeability of the resin coating to provide superior protection against corrosive substances compared to single materials.
2Reliability
If the pressure detection element is exposed to corrosive substances in the usage environment, then the structure remains simple with direct access to the measurement medium, but corrosion occurs at joining portions reducing measurement accuracy and reliability
Solution Approach 1:
The protection structure is applied in advance to the pressure detection element, wire, and lead frame before they are exposed to corrosive substances in the usage environment. The fluorine gel and resin coating form a pre-established barrier that actively prevents corrosive substances from reaching and damaging the joining portions, thereby maintaining reliability.
3Reliability
If a multi-layer protection structure with resin member and dual protection members is used, then reliability and corrosion protection are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the protection functions into an integrated multi-layer structure where the first protection member (fluorine gel) and second protection member (resin coating) are combined in sequence. The resin coating is applied to cover the fluorine gel, creating a unified protection system that maintains long-term detection accuracy while consolidating multiple protection functions into a single assembled structure.
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 laminated protection structure enhances the reliability of the pressure sensor by protecting the pressure detection element, wires, and lead frame from corrosion, ensuring accurate and long-term pressure detection.
Implementation Method 1
the second recessed portion is filled with a first protection member, wherein the first recessed portion has a resin member having a film shape provided therein, wherein the resin member covers an entire surface of the first protection member, and is in close contact with the first protection member, wherein the first recessed portion is filled with a second protection member
Data Source
AI summary
Provided is a pressure sensor device including: a case body; a pressure detection element; a wire; and a lead frame, wherein the case body has a first recessed portion and a second recessed portion formed therein, wherein the first recessed portion faces a pressure introduction chamber, wherein the second recessed portion is formed in a part of a bottom portion of the first recessed portion, wherein at least a part of the lead frame, the pressure detection element, and the wire are arranged inside of the second recessed portion, wherein the second recessed portion is filled with a first protection member, wherein the first recessed portion has a resin member having a film shape provided therein, wherein the resin member covers an entire surface of the first protection member, wherein the first recessed portion is filled with a second protection member.