Differential Pressure Sensor Filter Joining Stability
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Solution Overview
Problem
The existing semiconductor differential pressure sensors face reduced joining stability of filters due to thermal expansion and shrinkage of the case, which causes deformation of the joining surface, leading to instability in the filter attachment.
Innovation Solution
A differential pressure sensor design featuring a case body with a protrusion where the atmosphere introducing hole is formed, allowing the filter to be joined to the protrusion independently of the case's inner wall surface, thereby maintaining stability even with thermal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the filter is joined to the joining surface formed on the same plane as the inner wall surface, then the manufacturing process is simple, but the joining stability deteriorates due to thermal expansion and shrinkage of the case
Solution Approach 1:
The invention divides the case inner wall into two distinct surfaces: the original inner wall surface and a newly created joining surface formed by a protrusion. This segmentation allows the joining surface to be isolated from the thermal deformation effects that affect the main body of the case, thereby maintaining joining stability while keeping the manufacturing process relatively simple through integral forming of the protrusion.
Solution Approach 2:
The invention transitions from a two-dimensional planar joining surface to a three-dimensional protruding structure. By forming the joining surface on a protrusion that extends into the case interior, the patent creates a separate dimensional zone that is thermally isolated from the case wall, preventing thermal expansion and shrinkage from affecting filter joining stability.
2Device complexity
If the joining surface is formed on the same plane as the inner wall surface, then the structural complexity is low, but the filter joining stability deteriorates due to surface deformation
Solution Approach 1:
The case inner wall is segmented into the main wall structure and a separate protrusion structure. This segmentation isolates the joining function to a specific localized area that is structurally distinct from the case body, allowing the joining surface to maintain stability while the case undergoes thermal changes. The protrusion acts as an independent structural element that does not deform with the case wall.
Solution Approach 2:
The invention applies local quality by creating a protrusion with a specific joining surface that has different thermal and mechanical properties from the surrounding case wall. This localized structure is designed specifically for filter joining, providing enhanced stability and resistance to deformation while the rest of the case maintains its original structural characteristics.
3Ease of manufacture
If the filter is joined to a deformed joining surface, then the manufacturing process is straightforward, but the production yield decreases due to peeling and instability
Solution Approach 1:
The protrusion with the stable joining surface is formed in advance as an integral part of the case structure, before the filter joining process. This preliminary formation of a thermally stable joining surface ensures that subsequent filter attachment occurs on a surface that will not deform due to thermal expansion or shrinkage, thereby preventing peeling and improving production yield without complicating the overall manufacturing process.
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 design enhances the joining stability of the filter, preventing peeling and improving production yield by allowing for more precise and efficient joining, reducing production time and thermal expansion effects.
Implementation Method 1
The case thermally expands or shrinks with a change in ambient temperature
Data Source
AI summary
Provided is a differential pressure sensor capable of improving joining stability of a filter. The differential pressure sensor includes: a sensor module configured to detect a pressure difference between an atmospheric pressure and a pressure of a measured medium; a case body, which is configured to contain the sensor module, and in which an atmosphere introducing hole for introducing atmospheric air into the case body is formed; and a filter provided from inside the case body to cover the atmosphere introducing hole, the case body having a protrusion, which protrudes to an inside of the case body, the atmosphere introducing hole being formed in the protrusion, the filter being joined to the protrusion.