Arcuate Beam Electromechanical Relay for Uniform Air Gap Control
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Solution Overview
Problem
Transistors suffer from non-zero off-state leakage current and limited operating conditions, especially in low-power circuits and high temperatures, and are susceptible to ionizing radiation, while existing micro/nano-electromechanical relays face premature catastrophic failure due to non-uniform air gaps leading to high electric fields.
Innovation Solution
A micro/nano electromechanical relay device with a circularly arcuate beam that pivots about its axis, maintaining constant air gaps with actuator electrodes, reducing the likelihood of beam contact and requiring lower actuation voltages, and incorporating elastically deformable regions for improved stiction and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear beam is used in known electromechanical relays, then the device structure is simple, but non-uniform air gaps occur leading to high electric fields and premature catastrophic failure
Solution Approach 1:
The patent applies curvature by replacing the linear beam with an arcuate beam having a specific radius of curvature. This curved geometry ensures that the beam maintains a substantially uniform air gap with the actuator electrode during pivoting motion, eliminating the non-uniform air gaps that cause high electric fields and premature failure in linear beam designs.
Solution Approach 2:
The patent changes the geometric parameters of the beam by defining specific relationships between the beam's arc radius, the pivot axis position, and the actuator electrode placement. These parameter changes ensure uniform air gap maintenance throughout the beam's range of motion, resolving the reliability issue without excessive complexity.
2Reliability
If larger air gaps are maintained between beam and actuator electrodes, then the likelihood of beam contact with actuator electrode is reduced, but higher actuation voltages are required
Solution Approach 1:
The arcuate beam geometry allows the system to maintain smaller, uniform air gaps while the beam pivots about an offset axis. This curved path ensures the beam surface remains at a substantially constant distance from the actuator electrode, enabling lower actuation voltages compared to linear beam designs that would require larger safety margins.
Solution Approach 2:
The patent replaces the traditional linear flexing mechanism with a rotational pivoting mechanism. This substitution allows the beam to maintain uniform air gaps through rotational motion rather than linear deflection, enabling more efficient electrostatic actuation with lower voltages.
3Productivity
If transistors are used in integrated circuits, then device operation is achieved, but non-zero off-state leakage current occurs reducing efficiency in low-power circuits
Solution Approach 1:
The patent extracts the switching function from transistor-based logic and implements it using an electromechanical relay with a physically isolated beam that pivots to make or break contacts. This mechanical switching mechanism provides true off-state isolation with zero leakage current, eliminating the inherent leakage problem of transistor-based circuits.
4Adaptability or versatility
If transistors are used for switching, then circuit functionality is achieved, but limited operating conditions and susceptibility to ionizing radiation occur
Solution Approach 1:
The patent employs simple, robust mechanical components (arcuate beam, pivot axis, contact electrodes) that are inherently resistant to ionizing radiation and extreme temperatures. These passive mechanical elements have no sensitive semiconductor structures, enabling operation in harsh environments where transistors fail.
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 energy-efficient, reliable operation with reduced risk of premature failure, enabling the use of electromechanical relays in non-volatile computing devices like electronic memory with simplified architecture and consistent voltage requirements.
Implementation Method 1
the developed electrostatic forces maintain generally uniform magnitudes which can reduce the likelihood of the beam being drawn into contact with an actuator electrode
Implementation Method 2
The arm portion can comprise a flexible hinge portion, the flexible hinge portion being less stiff than the arcuate portion
Data Source
AI summary
A micro or nano electromechanical relay device (10) comprising a source electrode (204) an electrically conductive beam (202) comprising an arcuate portion (12a) coupled to the source electrode by an arm portion, first and second drain electrodes (DE1, DE2) and first and second actuator electrodes (AE1, AE2). The arc of the arcuate portion defines a beam axis (BA). The arcuate portion is mounted for pivotal movement about a pivot axis (PA) which is coaxial or generally coaxial with the beam axis.