3D Membrane Protection for Hearing Device Transducers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hearing device transducers are prone to malfunction due to entry of substances like cerumen or dirt, leading to reduced acoustic performance or failure, and current solutions either cause clogging or nonlinear sound transmission.
Innovation Solution
A 3D-shaped membrane with thinner portions for sound transmission and thicker portions for stability, integrated with stiffeners, provides a protective element for transducers, enhancing sound transmission while preventing clogging and maintaining mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fine and dense mesh filter is used to block cerumen, then protection against cerumen entry is improved, but the filter becomes prone to clogging and requires frequent replacement
Solution Approach 1:
The protective element is segmented into distinct functional zones: a first region with a fine mesh structure for cerumen filtration, and a second region with a larger pore structure for acoustic transmission. This segmentation allows each region to perform its specific function optimally without interfering with the other, reducing clogging while maintaining protection.
Solution Approach 2:
Different regions of the protective element have different structural properties tailored to their specific functions. The first region has high density for filtration, while the second region has lower density for acoustic transmission. This local differentiation of quality allows the single element to provide both protection and acoustic performance without requiring replacement.
2Reliability
If a flat membrane is used to protect the transducer, then protection against cerumen entry is improved, but sound transmission quality deteriorates due to nonlinear distortion at large sound levels
Solution Approach 1:
The protective element incorporates a curved or three-dimensional structure instead of a flat membrane. This curvature distributes acoustic pressure more evenly across the surface, preventing the nonlinear displacement and distortion that occurs with flat membranes at high sound levels, while maintaining effective cerumen protection.
Solution Approach 2:
The protective element transitions from a two-dimensional flat membrane to a three-dimensional structure with varying thickness and pore distribution. This dimensional change allows optimization of both protection and acoustic transmission properties, eliminating the nonlinear distortion issue while maintaining cerumen blocking capability.
3Strength
If the membrane bending stiffness is increased to prevent damage, then mechanical durability is improved, but sound transmission loss increases requiring larger receivers
Solution Approach 1:
The protective element is divided into regions with different thicknesses and stiffness properties. The first region has sufficient stiffness for durability, while the second region has optimized properties for acoustic transmission. This segmentation allows the system to achieve both durability and low acoustic loss without requiring larger receivers.
Solution Approach 2:
Different portions of the protective element have locally optimized properties: areas requiring strength have higher stiffness, while areas requiring acoustic transmission have lower loss characteristics. This local quality differentiation resolves the contradiction between durability and acoustic performance.
4Device complexity
If a single-layer membrane is used for protection, then device complexity is reduced, but the ability to simultaneously achieve protection, acoustic transmission, and mechanical stability deteriorates
Solution Approach 1:
The protective element is segmented into functionally distinct regions within a single integrated structure. This segmentation provides multiple functions (filtration, acoustic transmission, mechanical support) in one element, maintaining simplicity while achieving superior overall performance compared to single-function membranes.
Solution Approach 2:
The protective element is designed as a multi-functional component that simultaneously provides cerumen protection, acoustic transmission, and mechanical stability. This universality is achieved through the multi-region structure that combines different functional properties in a single element, reducing overall device complexity while enhancing reliability.
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 3D-shaped membrane design improves sound transmission and mechanical stability, reducing the need for servicing and spare parts, and ensures consistent acoustic performance across various frequencies.
Implementation Method 1
one or more thinner portions configured to transmit sound
Data Source
AI summary
Described herein are a protective element configured to be connected to an electroacoustic transducer or a sound tube included in a hearing device, the protective element comprising a 3D-shaped membrane enclosing a cavity with an opening at which the membrane is configured to connect to the transducer or sound tube, wherein the membrane has one or more thinner portions configured to transmit sound and one or more thicker portions at which a rigidity of the membrane is greater than at the thinner portions.