Conductive MEMS Flexure Assembly for Compact Low-Power Actuation
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Solution Overview
Problem
Existing miniaturized MEMS actuators face challenges in providing reliable, compact, and low-power solutions for camera packages, particularly in achieving precise mechanical motion within the constraints of portable devices, imaging devices, and medical instruments.
Innovation Solution
The development of an electrically-conductive MEMS flexure assembly with multiple subportions and conductive pads, allowing deformation in two axes and featuring a latching assembly with a biased latch bolt, enables precise mechanical motion and coupling of MEMS subportions, facilitating in-plane and out-of-plane actuation for MEMS actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional actuators are used to provide mechanical motion, then the actuation function is achieved, but the device size and power consumption increase
Solution Approach 1:
The patent replaces conventional mechanical actuators with a MEMS-based electrostatic actuation system. The movable platform is actuated through electrostatic forces generated by voltage applied to interdigitated electrodes, eliminating the need for traditional mechanical motors or actuators and achieving miniaturization while maintaining actuation functionality
Solution Approach 2:
The device is divided into distinct functional sub-portions including a fixed sub-portion and a movable sub-portion that can be independently fabricated and then assembled. This segmentation allows for optimized design of each component and simplifies the overall assembly process, contributing to compact device size
2Reliability
If conventional actuators are used to provide mechanical motion, then the actuation function is achieved, but power consumption increases
Solution Approach 1:
The electrostatic MEMS actuation system consumes significantly less power compared to conventional mechanical actuators. The actuation is achieved through voltage application to electrodes, which requires minimal energy, especially when using techniques like capacitive charging where energy is stored in the electric field rather than continuously consumed
Solution Approach 2:
The actuation system uses periodic voltage application to achieve motion, where voltage is applied to move the platform and then removed or reversed to return it to the original position. This periodic action pattern reduces average power consumption compared to continuous actuation required by conventional systems
3Stability of the object's composition
If MEMS subportions are coupled rigidly, then structural stability is improved, but mechanical flexibility and actuation range are reduced
Solution Approach 1:
The patent employs flexible hinge structures and thin-film suspended elements to connect the fixed and movable sub-portions. These flexible connections allow the movable platform to rotate and move in three-dimensional space while maintaining structural integrity, achieving both stability and flexibility simultaneously
Solution Approach 2:
The coupling between sub-portions is designed to be dynamic rather than rigid, allowing the structure to adapt its stiffness and movement characteristics based on operational requirements. The flexible hinges provide stable support at rest while enabling full range of motion during actuation
4Reliability
If complex latching mechanisms are used to secure MEMS subportions, then coupling reliability is improved, but device complexity increases
Solution Approach 1:
The latching mechanism is designed to be self-actuating through electrostatic forces. When voltage is applied to the latch electrodes, the electric field automatically engages or disengages the latching feature without requiring external mechanical actuation or complex control mechanisms, achieving reliable coupling with minimal complexity
Solution Approach 2:
The latching system uses electrostatic fields as an intermediary to transfer force and achieve coupling. Rather than direct mechanical engagement requiring complex levers or springs, the electric field mediates the coupling action, simplifying the mechanism while maintaining reliability
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 provides a compact, low-power, and efficient mechanism for MEMS actuators, enabling precise mechanical motion and latching configurations, enhancing the performance of camera packages and other miniaturized devices by allowing for linear and rotational movements.
Implementation Method 1
a biased latch bolt
Implementation Method 2
configured to allow deformation of the plurality of MEMS electrically-conductive flexures in two axes
Data Source
AI summary
An electrically-conductive, MEMS flexure assembly includes: a first MEMS subportion including a first plurality of electrically-conductive pads; a second MEMS subportion including a second plurality of electrically-conductive pads; and a plurality of MEMS electrically-conductive flexures electrically coupling the first plurality of electrically-conductive pads on the first MEMS subportion and the second plurality of electrically-conductive pads on the second MEMS subportion.