MEMS Parallelogram Guide for Precise Tilt-Resistant Positioning
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Solution Overview
Problem
Conventional MEMS actuators face challenges in achieving precise and robust positioning due to tilting issues under external influences and manufacturing asymmetries, especially in densely packed arrays, where the spring geometry is limited by space constraints and production-related stress, leading to non-linear spring forces and unwanted tilting.
Innovation Solution
The use of a parallelogram guide mechanism with two springs in different planes, asymmetrically suspended on one side, provides precise and robust positioning by minimizing tilting and relaxing production-related stress, allowing for individual electrical addressing of MEMS actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If springs are manufactured within one technological level with uniform material symmetry, then manufacturing precision is improved, but unwanted tilting occurs under external influences and production stress
Solution Approach 1:
The patent applies asymmetry by suspending the movable structural element asymmetrically on one side using a parallelogram guide mechanism with two springs in different planes. This asymmetric configuration compensates for production-related stress and external influences, preventing unwanted tilting while maintaining manufacturing precision through the parallelogram geometric constraint.
Solution Approach 2:
The patent moves from a single-plane spring arrangement to a three-dimensional configuration with springs in different planes (first spring plane and second spring plane). This dimensional change allows the parallelogram guide to maintain rigid parallel guidance while accommodating stress relaxation and preventing tilting under external loads.
2Device complexity
If multiple springs are attached to one post, then device complexity is reduced, but electrical addressing of individual actuators becomes impossible
Solution Approach 1:
The patent segments the electrical connection system by providing separate electrical connections to each movable structural element through the asymmetric spring suspension. Each actuator can be individually addressed electrically while the mechanical suspension remains simplified with springs attached to substrate extensions, achieving both low mechanical complexity and electrical versatility.
3Productivity
If spring geometry is constrained by space limitations in densely packed arrays, then productivity is improved, but spring constant control becomes difficult due to production stress
Solution Approach 1:
The patent utilizes three-dimensional space by arranging springs in different planes (first and second spring planes) rather than confining them to a single plane. This allows adequate spring length and geometry for precise spring constant control while maintaining compact footprint for high array packing density and productivity.
4Ease of manufacture
If radial straight springs are used, then ease of manufacture is improved, but spring constant becomes highly nonlinear and stress-dependent
Solution Approach 1:
The patent employs a parallelogram guide mechanism that dynamically maintains rigid parallel guidance during actuator movement. The two springs in different planes work together to provide linear force characteristics through the geometric constraint, allowing radial straight spring geometry for ease of manufacture while achieving reliable linear spring force behavior.
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 solution enables precise and robust positioning of MEMS actuators with reduced tilting, improved precision, and efficient use of space, while allowing for individual electrical addressing and adaptation to different application conditions.
Implementation Method 1
electrostatic attraction is used as a physical effect
Data Source
AI summary
A MEMS includes a substrate with a substrate extension that rises above a substrate plane. The MEMS includes a movable structural element, a first spring element that mechanically connects the movable structural element to the substrate extension, and a second spring element that mechanically connects the movable structural element to the substrate extension. The first spring element and the second spring element form a parallelogram guide of the movable structural element in relation to the substrate extension.