Deflectable MEMS Structure Using Trench Segmentation for Precision Positioning
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Solution Overview
Problem
Existing methods for deflecting and positioning MEMS structures lack precision, repeatability, and flexibility, often requiring high alignment accuracy and activating at specific points in time, with limited deflection capabilities and high energy consumption.
Innovation Solution
A deflectable structure with a layer having a trench structure and junctions that allow for movement between areas, utilizing intrinsic stress from materials with different thermal expansion coefficients, enabling deflection and precise positioning through thermal or mechanical activation at a predefined point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bimorph effect is used for positioning, then positioning is achieved with layer stresses, but actuators are automatically activated once exposed
Solution Approach 1:
The structure is divided into a first area and a second area separated by a trench structure, with controlled junctions that allow independent positioning of the first area while maintaining the second area as a stable reference. This segmentation enables precise positioning without automatic actuator activation.
Solution Approach 2:
A trench structure with controlled junctions acts as an intermediary mechanism between the first and second areas. The junctions provide a controlled connection that allows positioning through stress application without causing automatic actuator activation, mediating the interaction between positioning requirements and actuator control.
2Manufacturing precision
If surface forces are used for positioning, then positioning is achieved with surface tensions, but very high dosage accuracy is necessary for liquid application
Solution Approach 1:
The invention replaces the liquid-based surface force mechanism with a solid-state mechanical stress system. Instead of applying liquids and relying on surface tensions, the patent uses a trench structure with junctions that enable mechanical stress application, eliminating the need for high-precision liquid dosing while achieving comparable positioning accuracy.
3Manufacturing precision
If mechanical elements are used for positioning, then positioning is achieved below or above flat surface, but very high positioning accuracy and tight tolerances are necessary
Solution Approach 1:
The invention merges the positioning function with the existing layer structure by creating a trench within the same layer that contains the micromechanical structure. This integration eliminates the need for separate mechanical positioning elements and reduces alignment complexity, as the trench and junctions are formed in the same manufacturing process.
4Adaptability or versatility
If multilayers are used for deflection, then three-dimensional potential distribution is enabled, but expensive process steps and small deflections are required
Solution Approach 1:
The invention achieves three-dimensional positioning capability by utilizing the vertical dimension through the trench structure. The trench provides depth and vertical separation between the first and second areas, enabling 3D potential distribution without requiring multiple layered structures. This single-layer approach with vertical trench integration reduces process complexity while maintaining adaptability.
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 provides high positioning accuracy and repeatability without requiring high alignment accuracy, allowing for flexible deflection and activation at a predefined time, suitable for applications like microscanners and phase-shifting elements with reduced energy consumption.
Implementation Method 1
a structure (114) which in cooperation with the first area (110) creates a mechanical stress
Implementation Method 2
utilizing intrinsic stress created by materials with different thermal expansion coefficients
Implementation Method 3
the second junction (108) between the first area (110) and the second area (112) is implemented as a predetermined breaking point
Data Source
AI summary
A deflectable structure includes a layer having a first area and a second area, a trench structure in the layer which penetrates the layer and separates the first area from the second area, a first junction between the first area and the second area, and a second junction between the first area and the second area, the first area being permanently moveable from a first, permanent position with regard to the second area to a second position, deflected as compared to the first position, with regard to the second area by applying a force.