Unidirectional Condenser Microphone Insulator with Adjustable Sound Holes
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Solution Overview
Problem
Unidirectional condenser microphones face challenges in efficiently adjusting acoustic resistance due to the varying distance between acoustic terminals, requiring different numbers and diameters of sound holes in the insulator, which increases production costs and complexity.
Innovation Solution
A unidirectional condenser microphone design featuring an insulator with adjustable sound holes and an acoustic resistance member, where sound hole closing means and compressive force adjustment allow for coarse and fine tuning of acoustic resistance, enabling a shareable insulator for microphones with different terminal distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different numbers and diameters of sound holes are drilled in the insulator for microphones with different terminal distances, then acoustic resistance can be adjusted for each model, but production costs and device complexity increase significantly
Solution Approach 1:
The insulator is designed with a movable partition wall that can be positioned at different locations to selectively open or close sound holes. This dynamic structure allows a single insulator to adapt to different acoustic resistance requirements by changing its configuration, eliminating the need for multiple fixed insulator designs for different microphone models.
Solution Approach 2:
A single insulator design with adjustable partition wall positions serves multiple functions across different microphone models with varying terminal distances. The same insulator can be configured to provide different acoustic resistance values by moving the partition wall, making it universally applicable rather than requiring model-specific insulators.
2Ease of manufacture
If a fixed insulator design is used for all microphone models, then production costs decrease, but acoustic resistance cannot be properly adjusted for different terminal distances
Solution Approach 1:
The partition wall's movable design enables the single insulator to adapt to different acoustic resistance requirements dynamically. By adjusting the partition wall position, the same insulator can optimize sound hole openings for various terminal distances, maintaining adaptability while simplifying production.
Solution Approach 2:
The insulator is segmented into multiple regions by the movable partition wall, allowing selective opening or closing of different sound hole groups. This segmentation enables flexible configuration where only the necessary sound holes are opened for each application, providing adaptability across different models.
3Reliability
If high acoustic resistance values are required for narrow directional microphones with long terminal distances, then unidirectivity is achieved, but fine tunability becomes more difficult to maintain
Solution Approach 1:
The movable partition wall provides a mechanical means for fine adjustment of acoustic resistance. By precisely positioning the partition wall at different locations, the effective opening area of sound holes can be finely tuned to achieve the exact acoustic resistance value needed, even for high resistance requirements in narrow directional microphones.
Solution Approach 2:
The acoustic resistance parameter can be continuously adjusted by changing the partition wall position. This allows precise control over the effective sound hole area, enabling fine tuning of acoustic resistance values to achieve optimal unidirectivity performance for different microphone configurations.
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 approach allows for flexible acoustic resistance adjustment, reducing production costs and enabling the same insulator to be used across microphones with varying terminal distances, improving tunability and directivity while maintaining high acoustic resistance values.
Implementation Method 1
take advantage of acoustic resistance to adjust bi-directional components captured from the rear acoustic terminal
Implementation Method 2
the sound holes directing sound waves from the rear acoustic terminal to a back side of the diaphragm
Implementation Method 3
acoustic resistance adjusting means that applies compressive force to the acoustic resistance member to vary acoustic resistance of the member
Data Source
AI summary
To provide an insulator, which supports a fixed pole in a unidirectional condenser microphone in a shareable manner among microphones that are different in the distance between acoustic terminals from one another. Coarse adjustment is performed on an insulator 31 including a plurality of sound holes 32 drilled therein by acoustically closing a predetermined sound hole 32 among the plurality of sound holes 32 by a predetermined sound hole closing means, and fine adjustment is performed by applying a predetermined amount of compressive force to an acoustic resistance member 40 by an acoustic resistance adjusting means 50 (adjustment nut 51), so as to adjust acoustic resistance present in a sound wave passage from a rear acoustic terminal to the back of a diaphragm.