Flexible Lid Sensor Device for Sealing Stability
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Solution Overview
Problem
Existing force sensors with piezoelectric materials face challenges in maintaining air-tight sealing and stability due to dimensional errors and moisture infiltration, leading to unstable measurements, especially in adverse environments.
Innovation Solution
A sensor device configuration with a flexible portion surrounding the sensor element, which absorbs height differences between the force receiving surface and the joint surface, preventing stress concentration and maintaining air-tight sealing by deforming to ensure contact and distribute pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the force receiving surface and joint surface heights are made to coincide precisely, then manufacturing precision is improved, but device complexity increases due to the need for additional height adjustment mechanisms
Solution Approach 1:
The patent employs a flexible lid that can elastically deform to accommodate height differences between the force receiving surface and joint surface. This flexible structure eliminates the need for precise height matching while maintaining effective force transmission, thereby resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent changes the physical state of the lid from rigid to flexible, allowing it to adapt its shape and thickness to compensate for height variations. This parameter change enables the system to tolerate manufacturing tolerances without requiring complex adjustment mechanisms.
2Strength
If welding is used to attach the lid to the package, then strength is improved, but reliability deteriorates due to gaps and moisture infiltration from dimensional errors
Solution Approach 1:
The flexible lid can deform to ensure full contact with the force receiving surface, eliminating gaps that would otherwise allow moisture infiltration. This maintains the benefits of welding for strength while improving reliability by preventing moisture ingress through proper sealing contact.
Solution Approach 2:
The flexible nature of the lid provides a cushioning effect that compensates for dimensional errors and surface irregularities before they can cause sealing failures. This beforehand accommodation of potential problems ensures reliable sealing without requiring perfect manufacturing tolerances.
3Strength
If the lid is made rigid to maintain structural stability, then strength is improved, but adaptability deteriorates due to inability to accommodate height differences
Solution Approach 1:
The patent uses a flexible lid that can adapt to various height configurations while maintaining sufficient structural strength through optimized material selection and geometric design. This flexibility provides adaptability to height differences without sacrificing the structural stability needed for force transmission.
Solution Approach 2:
The lid may be constructed from composite materials that combine flexibility with structural strength, allowing it to both accommodate height variations and maintain the mechanical integrity required for stable force sensing operation.
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 flexible portion design stabilizes air-tight sealing over a long period, reduces stress concentration, and enhances durability, allowing precise force sensing even under varying environmental conditions.
Implementation Method 1
the flexible portion having flexibility that surrounds the vicinity of the sensor element in a position which is on the inner side with respect to an edge of an opening portion of the recess and on the outer side with respect to the sensor element
Implementation Method 2
the sensor element that is disposed in the recess and includes a piezoelectric body
Data Source
AI summary
A sensor device includes a package, a sensor element that is disposed in the package, and a lid that seals the package. The lid includes a flexible portion that surrounds the vicinity of the sensor element in a plan view.