MEMS Electrostatic Speaker Cell Array Design
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Solution Overview
Problem
Electrostatic speakers are large and costly, limiting their adoption due to size and cost constraints, while conventional speakers suffer from distortion issues.
Innovation Solution
A compact and cost-effective MEMS electrostatic speaker design utilizing an array of cells with microscopic-scale dimensions, featuring perforated stators and a thin membrane, operated with low voltages to achieve high performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic speaker design is used, then acoustic performance is improved, but device size increases and manufacturing cost increases
Solution Approach 1:
The electrostatic speaker is divided into multiple discrete cells, each contributing to the overall acoustic output. This segmentation allows the total acoustic performance to be achieved through parallel smaller units rather than a single large structure, thereby reducing the device volume while maintaining acoustic quality
Solution Approach 2:
The patent transitions from conventional two-dimensional speaker membranes to three-dimensional cellular structures with micro-scale dimensions. This dimensional change enables compact packaging of multiple acoustic elements, significantly reducing the overall device volume while preserving acoustic performance through volumetric arrangement
2Reliability
If conventional electrostatic speaker design is used, then acoustic performance is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the speaker into standardized cellular units, the manufacturing process can be optimized through modular production techniques. This allows for easier fabrication, assembly, and quality control, thereby reducing manufacturing costs while maintaining acoustic performance
Solution Approach 2:
The patent employs micro-scale dimensions and specific material parameter selections that enable fabrication using conventional micro-fabrication techniques. These parameter changes allow the use of established manufacturing processes, reducing development and production costs compared to conventional electrostatic speaker manufacturing
3Volume of moving object
If MEMS electrostatic speaker design is used, then device size is reduced, but sound pressure level capability may be limited
Solution Approach 1:
Multiple MEMS electrostatic cells are merged in parallel to achieve cumulative acoustic output. The combined sound pressure levels from multiple small cells reach or exceed 100 dB, overcoming the power limitations of individual micro-scale elements while maintaining compact device dimensions
Solution Approach 2:
The cellular structure is designed with pre-configured acoustic coupling and phase alignment to maximize sound pressure level output. This preliminary structural arrangement ensures that the acoustic waves from multiple cells constructively interfere, achieving high SPL without requiring excessive power input
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 MEMS electrostatic speaker achieves high sound pressure levels exceeding 100 dB and reduces distortion, offering a compact and affordable solution with improved frequency response and phase accuracy.
Implementation Method 1
applying activation voltages to stators of the cells, thereby inducing membranes of the cells to move between upper and lower stators of the cells and generate acoustic signals
Data Source
AI summary
A micro-electro-mechanical system (MEMS) electrostatic speaker that comprises an array of cells, wherein each cell comprises an upper stator, a membrane, a lower stator and supporting elements configured to support the upper stator, the membrane and the lower stator; wherein a distance between the upper stator and the lower stator of each cell is of microscopic scale.