Three-Layer Chip-Scale MEMS Device for Compact IMU
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Solution Overview
Problem
Inertial measurement units (IMUs) face challenges in integrating multiple components into limited spaces while maintaining performance, as traditional IMUs occupy significant volume due to the inclusion of three gyroscopes and three accelerometers, which can be prone to errors from external shocks, vibrations, and thermal mismatches.
Innovation Solution
A three-layer chip-scale micro-electromechanical systems (MEMS) device is developed, where MEMS gyroscopes and accelerometers are sealed between three glass layers, reducing volume and increasing rigidity, with recesses and interconnects for support, and hermetic seals to maintain different atmospheric conditions for each device type, enhancing robustness and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional IMU components (three gyroscopes and three accelerometers) are integrated, then motion information acquisition capability is improved, but device volume increases
Solution Approach 1:
The patent combines multiple MEMS devices (gyroscopes and accelerometers) into a single integrated IMU component, merging their functions into one unified device that occupies limited space while maintaining full motion information acquisition capability
Solution Approach 2:
The patent implements a multi-layer stacked architecture where device layers containing MEMS sensors are nested between outer layers, with central and outer layers bonded together to form a compact three-layer structure that maximizes space utilization
2Volume of moving object
If device volume is reduced for limited space applications, then space utilization is improved, but structural rigidity deteriorates
Solution Approach 1:
The patent employs a composite layered structure combining central and outer layers bonded together, creating a rigid multi-layer assembly that maintains structural strength while minimizing overall device volume through vertical stacking
Solution Approach 2:
The patent transitions from a planar two-dimensional layout to a three-dimensional stacked architecture, utilizing the vertical dimension to arrange device layers between outer layers, thereby reducing footprint area while maintaining structural integrity through bonded interfaces
3Device complexity
If MEMS devices are placed in a single atmospheric environment, then device simplicity is improved, but performance of different device types deteriorates
Solution Approach 1:
The patent creates different atmospheric environments in different regions of the device structure, with first MEMS devices (gyroscopes) positioned in a first atmosphere and second MEMS devices (accelerometers) positioned in a second atmosphere, allowing each device type to operate in its optimal environmental condition
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 results in a compact, robust IMU that preserves high performance by reducing strain-induced errors and maintaining desired performance in limited spaces, while efficiently managing different atmospheric conditions for MEMS devices within the IMU.
Implementation Method 1
a first device layer bonded to the first outer layer, a second device layer bonded to the second outer layer, the first side bonded to the first device layer and the second side bonded to the second device layer
Data Source
AI summary
Systems and methods for a micro-electromechanical system (MEMS) device are provided. In one embodiment, a system comprises a first outer layer and a first device layer comprising a first set of MEMS devices, wherein the first device layer is bonded to the first outer layer. The system also comprises a second outer layer and a second device layer comprising a second set of MEMS devices, wherein the second device layer is bonded to the second outer layer. Further, the system comprises a central layer having a first side and a second side opposite that of the first side, wherein the first side is bonded to the first device layer and the second side is bonded to the second device layer.