Bone Conduction Microphone Piezoelectric Element Segmentation
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Solution Overview
Problem
Conventional bone conduction microphones have reduced potential level detection due to full-surface attachment of piezoelectric elements, leading to decreased voice transmission and the unwanted transmission of call button vibration as unpleasant sounds to the other party.
Innovation Solution
A bone conduction microphone design with a piezoelectric element fixed only at its peripheral edge to an element support member, which includes a diaphragm part and a drive plate, allowing for increased deformation and reduced vibration transmission from the call button, enhancing voice pickup and suppressing unwanted noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the piezoelectric element is fully attached to the microphone pad, then the structure is stable and easy to manufacture, but the potential level output is reduced and voice transmission quality deteriorates
Solution Approach 1:
The piezoelectric element attachment is segmented into two distinct regions: a fixed peripheral edge portion that provides structural stability, and a free central portion that deforms under vibration to generate electrical signals. This segmentation resolves the contradiction by allowing both easy manufacture (through peripheral fixation) and high potential level output (through central deformation freedom).
Solution Approach 2:
Different regions of the piezoelectric element are given different functional qualities: the peripheral edge is fixed to provide structural stability and ease of manufacture, while the central portion is left free to maximize deformation and potential level output during vibration. This local differentiation of attachment quality resolves the contradiction between manufacturing ease and measurement precision.
2Stability of the object's composition
If the piezoelectric element is fully attached to the microphone pad, then the structure is stable, but vibration from the call button is transmitted as unpleasant sound
Solution Approach 1:
The attachment structure is segmented to fix only the peripheral edge of the piezoelectric element while leaving the central portion free. This segmentation allows the structure to remain stable through peripheral fixation while preventing harmful vibration transmission from the call button, as the free central portion does not transmit mechanical vibrations to the housing.
Solution Approach 2:
The harmful vibration transmission path is extracted by removing the full-surface attachment. By taking out the attachment from the central region, the transmission path for harmful vibrations from the call button is eliminated, while the peripheral attachment maintains structural stability.
3Device complexity
If the piezoelectric element is fully attached to the microphone pad, then the structure is simple, but voice transmission quality is reduced
Solution Approach 1:
The attachment structure is segmented into peripheral fixation and central freedom, creating a simple yet effective design that maintains structural simplicity while dramatically improving voice transmission quality through enhanced deformation capability of the piezoelectric element.
4Measurement precision
If the piezoelectric element is fixed at the peripheral edge only, then the potential level output is increased and voice transmission is improved, but the structure becomes more complex
Solution Approach 1:
The peripheral edge fixation structure segments the attachment function, providing both structural support and vibration isolation. This segmentation achieves high potential level output through free central deformation while maintaining relatively simple overall structure through the element support member design.
Solution Approach 2:
The element support member acts as an intermediary structure that provides peripheral fixation while allowing central freedom. This intermediary component enables the piezoelectric element to achieve high potential level output without significantly increasing overall structural 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
The design increases the potential level output of the piezoelectric element and effectively suppresses the transmission of call button vibration, improving voice transmission quality and reducing unwanted noise in bone conduction headsets.
Implementation Method 1
a piezoelectric element that converts the vibration acquired by the vibration acquisition unit into a voice signal
Data Source
AI summary
A bone conduction microphone includes a housing having an opening, a microphone pad, an element support member, a piezoelectric element, and a drive plate. The microphone pad is formed in a bottomed tubular shape having a bottom portion disposed outward and a tubular portion with an outer circumference fixed to an inner circumference of the opening. The element support member has an outer circumference fixed to an inner circumference of the tubular portion, and a support portion projecting toward the bottom portion. The piezoelectric element is in a plate shape with a peripheral edge of one surface fixed to the support portion and picks up vibration. The drive plate has a diaphragm part fixed to an inward surface of the bottom portion, and the diaphragm part is provided at a center with a protrusion fixed to an element central portion on another surface of the piezoelectric element.