Piezoelectric Microphone Series Cell Voltage Summing
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Solution Overview
Problem
Conventional piezoelectric microphones have limited sensitivity due to their simple parallel plate structure, which restricts the voltage level of the piezoelectric signal generated in response to sound pressure.
Innovation Solution
A piezoelectric microphone design featuring multiple cells arranged in various patterns on a protection layer, each comprising a lower electrode, a piezoelectric layer, and an upper electrode, connected in series to increase the total voltage level of the piezoelectric signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple parallel plate structure is used for the piezoelectric layer and electrodes, then the manufacturing process is simple and easy to fabricate, but the voltage level of the piezoelectric signal is limited and sensitivity cannot be increased
Solution Approach 1:
The piezoelectric microphone is divided into multiple unit cells arranged in series, where each cell consists of a lower electrode, piezoelectric layer, and upper electrode. This segmentation allows the voltage signals from each cell to be summed, thereby increasing the total voltage level and sensitivity while maintaining the simplicity of each individual cell structure for easy manufacturing.
2Measurement precision
If multiple cells are arranged in series to increase voltage level, then the sensitivity is enhanced, but the device complexity increases
Solution Approach 1:
Multiple unit cells are merged and connected in series configuration, where the upper electrode of one cell is connected to the lower electrode of the next cell. This merging approach allows the individual cell structures to be simplified while achieving enhanced sensitivity through voltage summation, as the connections are made through shared electrodes rather than complex intercell wiring.
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 increased number of cells allows for enhanced sensitivity by summing the piezoelectric signals, enabling the voltage level to be adjusted and improved, thereby overcoming the sensitivity limitations of traditional designs.
Implementation Method 1
The piezoelectric layer 30 generates a piezoelectric signal in proportion to an applied sound pressure
Data Source
AI summary
Provided is a piezoelectric microphone. The piezoelectric microphone includes a plurality of cells each having a lower electrode, a piezoelectric layer, and an upper electrode. The cells can be arranged on a protection layer in various patterns. Since the piezoelectric microphone includes the plurality of cells, the voltage level of a piezoelectric signal of the piezoelectric microphone can be easily increased to a desired level by adjusting the number of the cells. Thus, the sensitivity of the piezoelectric microphone can be increased.