Micromirror Mechanical Stop for Shock Protection
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Solution Overview
Problem
Micromirror devices are vulnerable to mechanical shocks, particularly during free fall and impact, due to inadequate protection of the mirror and suspension springs.
Innovation Solution
Incorporating a mechanical stop on the cap and function layer that restricts deflection perpendicular to the main extension plane, with a recess in the micromirror to accommodate the stop edge and connecting the micromirror to a suspension spring, enhancing the robustness by allowing the stop to overlap with the window frame and providing additional protection against overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no mechanical stop is provided, then the micromirror can deflect freely during operation, but the mirror and spring are vulnerable to mechanical shocks and impacts
Solution Approach 1:
The mechanical stop is pre-positioned on the cap or function layer before any shock or impact occurs. This preliminary positioning ensures that when mechanical shocks or impacts occur during free fall or vibration, the stop is already in place to restrict deflection of the micromirror perpendicular to the main extension plane, protecting both the mirror and suspension spring from damage
Solution Approach 2:
The micromirror device is segmented into distinct functional layers (cap layer, function layer, window layer) with the stop integrated into specific layers. This segmentation allows the stop to be positioned optimally without compromising the overall structure, enabling the stop to restrict deflection while maintaining the device's operational flexibility
2Reliability
If the stop is positioned to overlap with the window frame, then protection against overload is enhanced, but the gap dimensions and movement clearance are reduced
Solution Approach 1:
The stop is designed with specific local geometric features (such as protrusions or extended regions) that overlap with the window frame only in the perpendicular direction to the main extension plane. This local quality enhancement provides overload protection at the critical stop location while maintaining adequate gap dimensions and movement clearance in other directions, allowing the micromirror to rotate about its pivot axis without restriction
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 significantly enhances the micromirror's robustness against mechanical shocks, protecting the mirror and spring from impacts and vibrations, while maintaining small gap dimensions and adjustable movement clearance, thereby improving stability and controllability.
Implementation Method 1
the micromirror device has a stop, which is designed to restrict a deflection of the micromirror in a direction perpendicular to the main extension plane
Implementation Method 2
a micromirror being patterned out of the function layer... connects the micromirror to a suspension spring
Data Source
AI summary
A micromirror device having a cap, a function layer, and a window layer, which are disposed on top of one another and parallel to a main extension plane, the function layer being situated between the cap and the window layer, and a micromirror is patterned out of the function layer. The micromirror device has a stop, which is designed to restrict a deflection of the micromirror in a direction perpendicular to the main extension plane.