Electro-acoustic Transducer Diaphragm Support Structure
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Solution Overview
Problem
Conventional electro-acoustic transducers with a diaphragm fixed only at the peripheral portion are prone to breaking due to stress concentration, as pressure changes inside the device can cause diaphragm displacement.
Innovation Solution
Incorporating a support part with a displacement part that moves in response to pressure changes and a contacting part with elasticity, which reduces stress on the diaphragm by varying the distance between the diaphragm and the fixed electrode, thereby distributing pressure more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diaphragm is fixed only at the peripheral portion to the housing, then the structure is simple and easy to manufacture, but the diaphragm may break due to stress concentration when pressure changes cause displacement
Solution Approach 1:
A support part is introduced as an intermediary component between the diaphragm and the housing. This support part includes a displacement part that moves with pressure changes and a contacting part with an elastic surface that supports the diaphragm, thereby mediating the stress and preventing direct concentration on the diaphragm while maintaining manufacturing simplicity
Solution Approach 2:
The support part changes its physical state dynamically: the displacement part moves in response to pressure changes, and the contacting part utilizes elastic deformation to distribute stress. This parameter change allows the system to adapt to pressure variations while protecting the diaphragm from breaking
2Device complexity
If the diaphragm is fixed only at the peripheral portion, then the device structure is simple, but the sensitivity across frequency ranges is reduced
Solution Approach 1:
The support part provides localized support at a specific position on the diaphragm rather than fixing the entire periphery. This local quality approach allows the diaphragm to vibrate freely in most areas for high sensitivity while receiving targeted support where needed, maintaining low device 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 solution effectively reduces the likelihood of diaphragm breakage and enhances sensitivity across a wide range of frequencies, as demonstrated by improved sensitivity in both low and high-frequency ranges.
Implementation Method 1
the displacement part that is displaced in a direction in which the diaphragm is displaced in response to a change in pressure inside the housing
Implementation Method 2
a contacting part that is coupled to the displacement part and contacts the partial region with a surface having elasticity
Implementation Method 3
a diaphragm that oscillates in accordance with a potential difference between the diaphragm and the fixed electrode generated based on the electrical signal
Data Source
AI summary
An electro-acoustic transducer includes: a housing; a fixed electrode; a diaphragm that oscillates in accordance with a potential difference between the diaphragm and the fixed electrode generated based on the electric signal, the diaphragm being provided to face the fixed electrode; and a support part that supports the partial region of the diaphragm toward the fixed electrode, the support part including a displacement part that is displaced in a direction in which the diaphragm is displaced in response to a change in pressure inside the housing, and a contacting part contacts the partial region of the diaphragm, wherein a distance between the diaphragm and the fixed electrode in the partial region is less than a distance between the diaphragm and the fixed electrode outside the partial region.