Microphone Backplate Vent Hole Design for Diaphragm Integrity
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Solution Overview
Problem
Existing microphones face reliability issues due to strength reduction of the diaphragm from vent holes and potential contamination from particulate or volatile substances entering the sound receiving chamber, which affects normal operation.
Innovation Solution
Placing the vent hole on the backplate instead of the diaphragm prevents strength reduction and contamination, ensuring normal diaphragm vibration and improving microphone reliability by isolating the back and front chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a vent hole is provided on the diaphragm to release airflow and reduce air pressure in the back chamber, then the air pressure problem is solved, but the strength of the diaphragm decreases and particulate or volatilization substances may enter the sound receiving chamber
Solution Approach 1:
The patent divides the venting function from the diaphragm by providing a separate vent hole in the backplate. This segmentation allows the diaphragm to maintain its structural integrity while the backplate handles the pressure relief function, thus resolving the contradiction between pressure reduction and diaphragm strength preservation.
Solution Approach 2:
The backplate serves as an intermediary structure that provides the vent hole to release pressure without directly affecting the diaphragm. This intermediary approach allows pressure management while protecting the diaphragm from contamination, as the vent hole is positioned in the backplate rather than on the diaphragm surface.
2Productivity
If a vent hole is provided on the diaphragm to communicate with the sound receiving hole, then airflow can be released, but particulate or volatilization substances enter the sound receiving chamber through the vent hole
Solution Approach 1:
The patent separates the venting pathway from the sound receiving chamber by positioning the vent hole in the backplate rather than on the diaphragm. This segmentation creates an independent pressure relief route that does not intersect with the sound receiving chamber, preventing contamination while maintaining airflow release capability.
Solution Approach 2:
The vent hole is extracted from the diaphragm structure and relocated to the backplate. This extraction removes the contamination risk from the diaphragm area while preserving the pressure relief function, as the vent hole remains accessible to the back chamber for airflow release.
3Reliability
If the vent hole is positioned on the backplate instead of the diaphragm, then diaphragm strength is maintained and contamination is prevented, but the structure becomes more complex
Solution Approach 1:
The backplate is designed to serve multiple functions: it acts as the support structure for the diaphragm, provides the vent hole for pressure relief, and serves as the mounting surface for the sound receiving hole. This multi-functionality simplifies the overall structure by consolidating components, even though the vent hole is positioned on the backplate rather than the diaphragm.
Data Source
AI summary
A microphone is provided, including a base having a chamber; and a capacitor system fixed to the base. The capacitor system includes a backplate fixed to the base and a diaphragm located in the chamber. The backplate and the diaphragm form a capacitor structure. The diaphragm is fixed to the backplate and partitions the chamber into a front chamber and a back chamber. The backplate is provided with a sound receiving hole in communication with the front chamber. The base or the backplate is provided with a vent hole for communicating the back chamber with the outside. The microphone provided by the present disclosure has the advantages of high reliability.