Micromechanical Sensor Rocker Structures for Yaw Rate
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Solution Overview
Problem
Conventional yaw rate sensors with seismic masses arranged in a circle face challenges in miniaturization and material efficiency, often resulting in increased area requirements and a higher risk of electrostatic snapping, which can lead to functional impairment.
Innovation Solution
A micromechanical sensor component with four seismic masses and rocker structures, where the rocker structures are designed to reduce area requirements and prevent electrostatic snapping, allowing for compact design and reliable operation by using actuator electrodes strategically placed to detect rotation without increasing the component's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional frame encircling the seismic masses is used, then the structural integrity is maintained, but the area requirement increases
Solution Approach 1:
The continuous frame structure is segmented into discrete rocker structures positioned at specific locations around the seismic masses. Instead of a complete encircling frame, multiple independent rocker elements (first rocker structure, second rocker structure, etc.) are strategically placed to provide structural support while minimizing the overall area occupied by the frame components.
Solution Approach 2:
The frame structure transitions from a two-dimensional planar encirclement to a three-dimensional arrangement where rocker structures are positioned at different heights and angles. This vertical and angular distribution allows the frame to maintain its structural function while reducing the footprint area on the mounting surface.
2Loss of substance
If the component size is reduced for miniaturization, then material usage decreases, but the risk of electrostatic snapping increases
Solution Approach 1:
The rocker structures are pre-positioned and pre-configured to create physical barriers and maintain safe distances between electrostatic components before any electrostatic forces can develop. The rocker geometry is designed in advance to prevent actuator electrodes from approaching stator electrodes closely enough to cause electrostatic snapping, even when the overall component size is minimized.
Solution Approach 2:
The rocker structures serve as intermediary elements between the actuator electrodes and stator electrodes. These rocker components physically intervene in the space between opposing electrodes, preventing direct electrostatic interaction and snapping while allowing the component to maintain a compact overall size.
3Reliability
If rocker structures are added to prevent electrostatic snapping, then reliability improves, but device complexity increases
Solution Approach 1:
The rocker structures are designed to perform multiple functions simultaneously: they provide structural support for the seismic masses, define the operational boundaries to prevent electrostatic snapping, and serve as mechanical constraints for the oscillating motion. This multi-functionality reduces the need for separate components and simplifies the overall device architecture despite the added reliability features.
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 solution enables a compact, cost-effective yaw rate sensor with reduced material usage and minimized risk of electrostatic snapping, ensuring reliable sensor function and improved integration density.
Implementation Method 1
at least one actuator electrode, which during the first rocking movement of the first rocker structure in relation to at least one stator electrode, arranged immovably on the mount, is adjustable
Implementation Method 2
the first rocker structure, connected at least via a first rocker coupling element to the first seismic mass and via a second rocker coupling element to the second seismic mass, is arranged on the mount that the first rocker structure in relation to the mount in a first rocking movement about a predetermined first axis of rotation is displaceable
Implementation Method 3
It should then be possible to determine a rate of rotation by detecting the rotational movement using comb electrodes
Data Source
Figure 1a
Figure 1b
AI summary
The invention relates to a micromechanical sensor component for a rotation rate sensor, comprising a first, second, third, and fourth seismic mass (12a to 12d) which are arranged on a mounting (10) in a movable manner about an intermediate space such that the first seismic mass (12a) and the second seismic mass (12b) can be moved at least along one first pivot axis (14), and the third seismic mass (12c) and the fourth seismic mass (12d) can be moved at least along one second pivot axis (16). A first rocker structure (26a) is connected to the first seismic mass (12a) via a first rocker coupling element (28a) and to the second seismic mass (12b) via a second rocker coupling element (28b) and is arranged on the mounting (10) adjacently to an outer face (30a) of the third seismic mass (12c) such that the first rocker structure (26a) can be set into a first rocker movement about a specified first pivot axis (32a) with respect to the mounting (10).