Micromechanical Pressure Sensor Spring Element Design
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Solution Overview
Problem
Micromechanical pressure sensors face challenges in maintaining robustness against mechanical stresses such as bending and thermal expansion differences, which can lead to faulty pressure signals due to coupling of external influences into the sensor core.
Innovation Solution
A micromechanical pressure sensor design featuring a pressure sensor core with a cavity and a spring element that connects it to a pressure sensor frame, minimizing stress coupling and maximizing mechanical robustness, including various configurations like cantilever-type, ring-shaped, and symmetrically disposed connection elements for optimal stress decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pressure sensor core is rigidly connected to the pressure sensor frame, then structural stability is improved, but mechanical stress from the environment is coupled into the sensor core
Solution Approach 1:
The patent employs a flexible spring element connecting the pressure sensor core to the frame, allowing the connection to deform elastically under external mechanical stress while maintaining structural stability. This flexible connection absorbs environmental stresses without transmitting them to the sensitive sensor core, resolving the contradiction between stability and stress isolation.
2Object-affected harmful factors
If a soft spring element is used to decouple stress, then mechanical robustness is improved, but stability during external acceleration deteriorates
Solution Approach 1:
The spring element is designed with specific geometric parameters (length, width, thickness) that optimize its stiffness characteristics. By carefully selecting these parameters, the spring provides sufficient softness to decouple mechanical stress while maintaining enough stiffness to ensure stability during external acceleration, thus resolving the contradiction between robustness and acceleration stability.
3Stability of the object's composition
If the spring element is rigid, then stability during acceleration is improved, but stress decoupling capability deteriorates
Solution Approach 1:
The spring element is designed with specific geometric parameters (length, width, thickness) that optimize its stiffness characteristics. By carefully selecting these parameters, the spring provides sufficient softness to decouple mechanical stress while maintaining enough stiffness to ensure stability during external acceleration, thus resolving the contradiction between robustness and acceleration stability.
4Object-affected harmful factors
If multiple connection elements are used, then mechanical robustness is improved, but complexity of the structure increases
Solution Approach 1:
The spring element is divided into multiple segments or connection points that connect the pressure sensor core to the frame at different locations. This segmentation distributes the mechanical loads and improves robustness while maintaining a relatively simple overall structure, as each segment can be designed using the same basic spring geometry.
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 design provides enhanced mechanical decoupling and stability, preventing static moments and reducing mechanical stress on the sensor core, ensuring accurate pressure measurements even under external accelerations and impacts.
Implementation Method 1
a spring element for the mechanical connection of the pressure sensor core to the pressure sensor frame, which is developed in such a way that a mechanical robustness is maximized and the coupling of stresses from the pressure sensor frame into the pressure sensor core is minimized
Data Source
AI summary
A micromechanical pressure sensor, having—a pressure sensor core including a sensor diaphragm and a cavity developed above the sensor diaphragm; and—a pressure sensor frame; and—a spring element for the mechanical connection of the pressure sensor core to the pressure sensor frame being developed in such a way that a mechanical robustness is maximized and a coupling of stress from the pressure sensor frame into the sensor pressure core is minimized.