Micromechanical Z-Inertial Sensor Lever Stop Mechanism
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Solution Overview
Problem
Existing micromechanical z-inertial sensors require additional process steps and complexity for manufacturing stop knobs, limiting stop distance and direction, and suffer from imprecise stop behavior due to variations in layer depositions.
Innovation Solution
The use of torsion spring elements connected to a seismic mass via lever elements, which act as stop elements, allowing for precise and cost-effective stop implementation without additional layer depositions, enabling parameterization of stop action through geometric design and leveraging layer ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stop knobs are manufactured using additional layer depositions, then a stop concept can be implemented, but manufacturing complexity increases and stop behavior becomes imprecise due to layer deposition variations
Solution Approach 1:
The invention extracts the stop function from the layer deposition process and implements it through a mechanical lever element that strikes against a stop surface. This separates the stop mechanism from the sensitive layer deposition process, eliminating the precision problems caused by layer thickness variations while reducing manufacturing complexity.
Solution Approach 2:
The lever element acts as an intermediary between the seismic mass and the stop surface. Instead of directly depositing stop knobs through multiple layers, the lever element transmits the stopping action mechanically, providing precise and reproducible stop behavior independent of layer deposition variations.
2Adaptability or versatility
If stop knobs of defined height are manufactured through the manufacturing process, then a stop distance can be set, but only downward stop is possible and upward stop requires further added complexity
Solution Approach 1:
The lever element provides universal stop capability in both upward and downward directions without requiring separate stop knobs for each direction. The single lever element can strike against stop surfaces positioned above or below the seismic mass, providing bidirectional stopping functionality while maintaining simple manufacturing.
3Ease of manufacture
If additional layer depositions are performed to create stop knobs, then a stop concept is achieved, but manufacturing cost and process time increase
Solution Approach 1:
The invention removes the stop knob formation step from the layer deposition process entirely. The stop function is achieved through the lever element geometry and its interaction with stop surfaces, eliminating the need for additional layer depositions and associated manufacturing time and cost.
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 approach simplifies the manufacturing process, provides precise stop behavior, and allows for both downward and upward stops, reducing manufacturing complexity and variability in layer depositions, while avoiding electrostatic issues.
Implementation Method 1
the lever element being designed to strike against a stop element
Implementation Method 2
torsion spring elements joined to the first seismic mass element
Data Source
AI summary
A micromechanical z-inertial sensor. The micromechical z-inertial sensor includes at least one first seismic mass element; and torsion spring elements joined to the first seismic mass element. In each case, first torsion spring elements are connected to a substrate, and second torsion spring elements are connected to the first seismic mass element. A first and a second torsion spring element in each case is joined to one another with the aid of a lever element. The lever element is designed to strike against a stop element.