MEMS Device With In-Plane Shutter Valve for Ultrasonic Fluid Control
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Solution Overview
Problem
Existing MEMS devices lack enhanced performance in generating pressure waves and fluid motion efficiently, particularly in ultrasonic frequency ranges, which limits their applications in devices like loudspeakers and pumps.
Innovation Solution
A MEMS device with a substrate, a membrane structure deflectable out-of-plane, and a valve structure comprising a planar perforated and shutter structure that switches between positions to control fluidic resistance, allowing for ultrasonic frequency operation and demodulation to audio frequencies, is developed. The valve structure includes a shutter that moves in-plane and a control circuitry to manage the membrane and actuator for sound pressure generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional MEMS device structure is used, then the device can operate in ultrasonic frequency range, but the efficiency of generating pressure waves and fluid motion is insufficient
Solution Approach 1:
The shutter structure is made movable in-plane between first and second positions, allowing dynamic adjustment of fluidic resistance. This dynamic configuration enables optimization of fluid motion efficiency by switching between different resistance states, thereby improving productivity while managing energy loss through adaptive control rather than static design
Solution Approach 2:
The valve structure changes the fluidic resistance parameter by switching the shutter between positions. This parameter change allows the system to optimize fluid motion efficiency for different operating conditions, resolving the contradiction between productivity and energy loss by adapting resistance levels to match operational requirements
2Productivity
If a valve structure with movable shutter is added to control fluidic resistance, then fluid motion efficiency is enhanced, but device complexity increases
Solution Approach 1:
The valve structure is segmented into distinct components: a planar perforated structure and a separate movable shutter structure. This segmentation allows independent optimization of each component's function while maintaining overall simplicity. The shutter can be controlled independently to adjust fluidic resistance without complicating the entire device architecture
Solution Approach 2:
The shutter structure moves in-plane (lateral dimension) rather than out-of-plane, adding a dimensional aspect to fluid control. This in-plane movement mechanism provides efficient fluidic resistance control while avoiding the complexity of out-of-plane mechanical structures, thus enhancing productivity without proportionally increasing device complexity
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 configuration enables efficient fluid motion and sound pressure modulation, enhancing the performance of MEMS devices in both ultrasonic and audio frequency ranges, thereby improving their functionality in applications such as loudspeakers and pumps.
Implementation Method 1
a membrane structure mechanically connected to the substrate and configured for deflecting out-of-plane with regard to a substrate plane and with a frequency in an ultrasonic frequency range to cause a fluid motion in the cavity
Implementation Method 2
a shutter structure opposing the perforated structure and arranged moveably in-plane with a frequency in the ultrasonic frequency range and with regard to the substrate plane and between a first position and a second position
Data Source
AI summary
A MEMS device includes a substrate having a cavity and a membrane structure mechanically connected to the substrate and configured for deflecting out-of-plane with regard to a substrate plane and with a frequency in an ultrasonic frequency range to cause a fluid motion of the fluid in the cavity. The MEMS device includes a valve structure sandwiching the cavity together with the membrane structure, wherein the valve structure includes a planar perforated structure and a shutter structure opposing the perforated structure and arranged movably in-plane and with a frequency in the ultrasonic frequency range and with regard to the substrate plane and between a first position and a second position. The shutter structure is arranged to provide a first fluidic resistance for the fluid in the first position and a second, higher fluidic resistance for the fluid in the second position.