In-Plane Micro Bearings for MEMS Drive Assemblies
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Solution Overview
Problem
Current microelectromechanical systems (MEMS) face challenges in developing miniaturized machines with efficient in-plane and out-of-plane motion transmission and bearing systems, which are crucial for applications such as micro blenders and micro vehicles, due to limitations in power requirements, force generation, and footprint constraints.
Innovation Solution
The development of micro drive assemblies that include a substrate with in-plane micro shafts and micro bearings, coupled with various actuators like thermal and torsional ratcheting actuators, and micro transmissions that enable efficient in-plane and out-of-plane motion conversion, allowing for smaller, more powerful, and lower power-consuming devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional MEMS devices are used, then the device size is reduced, but the power requirements increase and force generation capability decreases
Solution Approach 1:
The patent transitions from conventional out-of-plane MEMS structures to in-plane micro shafts and bearings, utilizing the planar dimension of the substrate to reduce device footprint while maintaining functional performance. The in-plane configuration allows for more efficient force transmission and reduced power consumption at micro scales.
Solution Approach 2:
The invention changes the geometric parameters of the bearing structures, using conical surfaces with specific apex angles (e.g., 60 degrees) and optimized dimensions to improve mechanical efficiency. By adjusting the bearing geometry and material properties, the device achieves lower power requirements while maintaining miniaturization.
2Volume of moving object
If conventional MEMS devices are used, then the device size is reduced, but the force generation capability decreases
Solution Approach 1:
The patent utilizes in-plane force transmission through the substrate plane, allowing for more effective force generation compared to vertical out-of-plane structures. The in-plane micro shafts can transmit forces laterally across the substrate, leveraging the mechanical properties of the substrate for enhanced force capability at reduced device size.
Solution Approach 2:
The invention employs composite structures combining the substrate material with integrated micro bearing components and actuator elements. This composite approach allows for optimized force transmission pathways and enhanced mechanical performance, enabling significant force generation in miniaturized devices.
3Power
If micro drive assemblies with in-plane shafts and micro bearings are implemented, then power requirements are reduced and force generation is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified structures: the micro shafts serve as both structural support and force transmission elements, while the micro bearings are directly formed within the substrate matrix. This merging of functions reduces the number of discrete components and simplifies the overall device architecture, offsetting the complexity introduced by in-plane mechanisms.
Solution Approach 2:
The in-plane micro shafts and bearings are designed to perform multiple functions simultaneously: mechanical support, force transmission, and motion guidance. This multi-functionality reduces the need for separate specialized components, thereby managing device complexity while achieving improved power efficiency and force generation.
4Area of stationary object
If micro machines are miniaturized to one to two orders of magnitude smaller, then chip footprint is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The transition to in-plane structures allows for more tolerant fabrication processes compared to vertical out-of-plane features. The planar geometry of in-plane shafts and bearings can be manufactured using standard photolithography and etching techniques with relaxed precision requirements, enabling significant chip footprint reduction while maintaining manufacturability.
Solution Approach 2:
The invention specifies optimized geometric parameters for the micro bearings, such as conical surfaces with 60-degree apex angles and carefully controlled dimensions. These parameter choices are designed to be compatible with existing manufacturing capabilities, achieving miniaturization without excessively stringent precision requirements by leveraging robust geometric configurations.
Data Source
AI summary
A micro drive assembly may comprise a substrate, a micro shaft oriented in-plane with the substrate and at least one micro bearing to support rotation of the micro shaft. The micro shaft and micro bearing may be in or less than the micrometer domain.