Triangular Transducer Membrane for Condenser Microphone Resonance Control

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Solution Overview

Problem

Condenser microphones suffer from pronounced resonance phenomena, which deteriorate sound quality due to non-linear frequency response.

Innovation Solution

The use of a transducer membrane with an essentially triangular shape and a corresponding electrode surface with attenuation recesses, arranged in a specific pattern to reduce transverse air flow and provide controlled attenuation, results in improved sound reproduction by minimizing strong local frequency variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a circular transducer membrane is used, then the structure is simple and easy to manufacture, but pronounced resonance phenomena occur which deteriorate sound quality

Engineering Contradiction:

Improvemembrane structure simplicityVSAvoidresonance phenomena

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies asymmetry by changing the membrane shape from the conventional circular form to a triangular shape with straight edges and corners. This asymmetric geometry fundamentally alters the vibration modes and resonance characteristics of the membrane, eliminating the pronounced resonance phenomena that occur with circular membranes while maintaining manufacturing feasibility through standard cutting and mounting processes.

Inventive Principle:

Principle #4Asymmetry

2Object-affected harmful factors

If the membrane shape is changed to reduce resonance, then sound quality improves, but the manufacturing complexity increases

Engineering Contradiction:

Improveresonance phenomenaVSAvoidmembrane fabrication

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent applies local quality by adding attenuation recesses at specific locations on the membrane surface, particularly near the corners and along the edges. These localized structural modifications create controlled damping zones that reduce resonance phenomena without requiring complete redesign of the entire membrane, thus maintaining relatively simple manufacturing processes while achieving improved sound quality.

Inventive Principle:

Principle #3Local quality

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 configuration achieves a smoother frequency response and balanced sound wave registration, reducing resonance issues and enhancing sound quality.

Implementation Method 1

condenser microphone for transformation of sound waves to an electric signal

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentEP1900249B1Electro acoustic transducer

Publication Date: 2012.10.24 EHRLUND GORAN

Figure 1a~1c
Figure 2
Figure 3a~3b

AI summary

Condenser microphone capsule (10) with an electrically conducting transducer membrane (15) arranged in parallel with and at a distance from an electrically conducting electrode sur- face (26) wherein the active area (20) of the transducer membrane has an essentially triangu- lar shape.