Bone Conduction Microphone Displacement Limiter for Reliability
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Solution Overview
Problem
Bone conduction microphones in the related art lack a mechanism to limit the maximum displacement of the vibration structure, leading to potential damage and reduced reliability, especially in noisy environments.
Innovation Solution
Incorporation of a limiter, such as a protrusion or sealed space, to restrict the maximum displacement of the vibration structure, preventing excessive movement and potential damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no limiter is provided in the vibration structure, then the vibration structure can move freely to capture voice vibrations, but the maximum displacement cannot be limited causing potential damage to the vibration structure
Solution Approach 1:
The patent applies preliminary action by pre-installing limiters (protrusions or sealed spaces) in the vibration structure before operation. These limiters are positioned in advance to prevent excessive displacement of the diaphragm and mass block, thereby avoiding potential damage during testing or normal use without requiring real-time control mechanisms.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating sealed spaces within the vibration structure that act as mechanical buffers. When the diaphragm and mass block displace towards the cavity opening, the sealed space provides resistive force before the components reach the limiter, cushioning the movement and preventing sudden impacts that could cause damage.
2Productivity
If the vibration structure is allowed to displace excessively during testing, then the testing process is simple and fast, but the vibration structure is very easy to be damaged
Solution Approach 1:
The limiters are designed and positioned in advance during manufacturing, so during testing the vibration structure can immediately operate within safe displacement limits without requiring complex test protocols or real-time monitoring. This maintains testing efficiency while preventing damage.
3Reliability
If a limiter is added to the vibration structure, then the maximum displacement can be limited to prevent damage, but the device complexity increases
Solution Approach 1:
The patent merges the limiter function with existing structural elements of the microphone. The limiters are integrated into the substrate, backplate, or mounting plate that already form part of the microphone housing. This combining approach adds the protection function without significantly increasing overall device complexity or component count.
Solution Approach 2:
The substrate, backplate, and mounting plate serve multiple functions: they provide structural support, define the cavity, and simultaneously incorporate limiters to protect the vibration structure. This multi-functionality reduces the need for separate dedicated limiter components, thereby minimizing added 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 limiter effectively prevents damage to the vibration structure, enhancing the reliability and durability of the bone conduction microphone.
Implementation Method 1
Bone conduction microphones convert slight vibrations of bones of the head and neck caused by human voice into electrical signals
Data Source
AI summary
A bone conduction microphone is disclosed. The bone conduction microphone includes a substrate having a cavity with two end openings, a backplate disposed above the substrate, a vibration structure disposed between the backplate and the substrate, and a limiter for limiting a maximum displacement of the vibration structure. The vibration structure includes a diaphragm disposed between the backplate and the substrate and arranged at intervals with the backplate and the substrate respectively and a mass block suspended by the diaphragm and inserted into the cavity through one end opening of the cavity. The bone conduction microphone improves the reliability.