Piezoelectric Audio Device Electrode Length Optimization
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Solution Overview
Problem
The frequency response of piezoelectric flaps in audio devices can shift due to residual stress and mechanical fatigue, leading to degraded audio fidelity.
Innovation Solution
The apparatus includes a substrate with an opening, a first piezoelectric flap with electrodes extending no more than half of its length, and a second piezoelectric flap with electrodes extending similarly, allowing for independent control and operation of each flap to maintain optimal frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric flap uses full-length electrodes to maximize electrical coupling, then the electrical signal generation is improved, but the residual stress and mechanical fatigue effects are amplified causing frequency response shift
Solution Approach 1:
The patent extracts only the necessary portion of the piezoelectric flap (electrodes extending no more than half the length) to perform the electrical coupling function while removing the excess material that would be susceptible to residual stress and mechanical fatigue. This extraction reduces the harmful effects without compromising the essential transduction function.
Solution Approach 2:
The patent applies different qualities to different parts of the piezoelectric flap by limiting electrode extension to no more than half the flap length. This creates a local quality distinction where the electrode region has optimized electrical coupling while the reduced overall structure experiences less mechanical stress accumulation.
2Measurement precision
If the piezoelectric flap is designed with full electrode extension to maximize sensitivity, then the audio signal conversion is improved, but the mechanical fatigue and stress variations increase leading to frequency drift
Solution Approach 1:
The patent applies partial action by extending electrodes only to no more than half the piezoelectric flap length rather than the full length. This partial extension provides sufficient electrical coupling for adequate signal detection while avoiding the excessive material that would be prone to mechanical fatigue and stress variations.
3Use of energy by moving object
If the electrodes extend the full length of the piezoelectric flap to maximize electrical contact, then the energy conversion efficiency is improved, but the impact of foreign matter and stress variations increases
Solution Approach 1:
The patent extracts only the necessary electrode length (no more than half the flap length) to perform energy conversion while removing the excess portion that would be more susceptible to foreign matter contamination and stress variations, thus maintaining adequate energy conversion with reduced vulnerability.
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 helps maintain the designed frequency response by minimizing the impact of residual stress and mechanical fatigue, thereby enhancing the audio fidelity of the device.
Implementation Method 1
A piezoelectric transducer can convert between mechanical energy (e.g., vibration) and electrical energy using piezoelectric effect
Data Source
AI summary
In one example, an apparatus comprises a substrate, a first piezoelectric flap, and a second piezoelectric flap. The substrate has an opening. The first piezoelectric flap has a first end on the substrate and has a first portion extending over a first part of the opening, the first piezoelectric flap including first electrodes, in which the first electrodes extend no more than half of a first length of the first portion. The second piezoelectric flap has a second end on the substrate and has a second portion extending over a second part of the opening, the second piezoelectric flap including second electrodes, in which the second electrodes extend no more than half of a second length of the second portion.