Micromechanical Assembly Perpendicular Displacement via Spring-Actuator
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Solution Overview
Problem
Existing micromechanical assemblies with fixed and movable electrode fingers primarily allow for movement within the plane of the electrode combs, limiting their application in scenarios requiring perpendicular displacement, and often require complex alignment and additional drive components.
Innovation Solution
A micromechanical assembly with a displaceable component connected via springs, allowing bidirectional perpendicular displacement without the need for additional drive components like magnets, utilizing a SEA principle with electrode combs structured from conductive layers and insulating layers to facilitate cost-effective and simple manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional micromechanical assemblies with fixed and movable electrode fingers are used, then movement within the plane of the electrode combs is achieved, but perpendicular displacement capability is limited
Solution Approach 1:
The patent introduces a spring element that enables the displaceable component to move perpendicular to the plane of the electrode combs, adding a third dimension (z-axis) to the previously two-dimensional (x-y plane) movement capability. This dimensional expansion allows the actuator to achieve bidirectional perpendicular displacement without requiring complex alignment mechanisms, as the spring naturally accommodates out-of-plane motion.
2Adaptability or versatility
If additional drive components like magnets are added to achieve perpendicular displacement, then displacement capability is improved, but device complexity and installation space increase
Solution Approach 1:
The spring element serves dual functions: it provides the mechanical compliance needed for perpendicular displacement and simultaneously acts as the drive mechanism itself. The electrostatic comb drive generates force that, through the spring's elastic properties, produces perpendicular motion without requiring separate magnetic or mechanical drive components. This self-service approach eliminates the need for additional magnets or complex drive mechanisms.
3Manufacturing precision
If precise alignment of drive components is required during manufacturing, then actuation precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the mechanical parameter of the connection between the displaceable component and the mounting from a rigid fixed connection to a compliant spring connection. This parameter change allows manufacturing tolerances to be significantly relaxed, as the spring can accommodate misalignments and still provide functional perpendicular displacement. The electrostatic comb drive structure itself provides self-alignment through its symmetric finger configuration, further simplifying manufacturing.
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
Enables efficient perpendicular displacement of components by 50 μm in both directions with low power consumption, suitable for applications like microoptics and spectrometers, and reduces manufacturing complexity by eliminating alignment requirements and additional drive components.
Implementation Method 1
The displaceable component is displaceable in a first displacement direction having a first directional component which is perpendicular to the central plane of the stator electrode comb by application of a first voltage between the electrode combs
Implementation Method 2
The displaceable component may be connected to the mounting together with the at least one actuator electrode comb via at least one spring, for example
Data Source
AI summary
A micromechanical assembly having a mounting, at least one stator electrode comb, which is fixedly placed on the mounting, having at least two stator electrode fingers, whose central longitudinal axes are on a central plane of the stator electrode comb, at least one actuator electrode comb having at least two actuator electrode fingers, and a displaceable component, which is coupled to the at least one actuator electrode comb so that the displaceable component is displaceable in relation to the mounting at least in one first displacement direction using a nonzero operating voltage, which is applied between the at least two stator electrode fingers and the at least two actuator electrode fingers, the first displacement direction having one first nonzero directional component perpendicular to the central plane.