Hearing Device Mechanical Element for Acoustic Tuning and Cerumen Protection
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Solution Overview
Problem
Hearing devices face challenges in achieving a desired frequency response due to size constraints and ear canal geometry variations, and are prone to malfunctions from substance ingress, such as cerumen, which affects sound quality and reliability.
Innovation Solution
A hearing device with a mechanical element featuring alternating thinner and thicker portions around its structure, which modifies sound output and provides ingress protection, allowing for improved sound transmission and acoustic performance while reducing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hearing device size is reduced to meet wearability constraints, then the device can fit better in the ear canal, but the frequency response quality deteriorates due to limited space for acoustic components
Solution Approach 1:
The mechanical element is divided into multiple sections with alternating thinner and thicker portions, allowing each section to serve different acoustic functions within a compact structure. This segmentation enables complex frequency response shaping without increasing overall device volume.
Solution Approach 2:
Different portions of the mechanical element have different thicknesses to create localized acoustic properties. The thinner portions allow sound transmission while the thicker portions provide structural support and ingress protection, optimizing both size and frequency response quality in specific regions.
2Object-affected harmful factors
If a dense mesh filter is used to block cerumen, then substance ingress protection is improved, but sound transmission quality deteriorates due to filter clogging and acoustic impedance
Solution Approach 1:
The mechanical element uses a flexible membrane structure with alternating thin and thick portions that acts as a cerumen filter. The thin portions allow sound transmission while the thick portions provide structural integrity and blocking capability, maintaining both protection and sound quality without clogging issues.
Solution Approach 2:
The mechanical element's structure with alternating thin and thick portions creates a porous-like acoustic filter that allows sound frequencies to pass through while blocking cerumen and other substances, avoiding the clogging problems associated with dense mesh filters.
3Device complexity
If the mechanical element structure is simplified, then device complexity is reduced, but the ability to shape frequency response deteriorates
Solution Approach 1:
The mechanical element with alternating thin and thick portions serves multiple functions simultaneously: it acts as a cerumen filter, shapes the frequency response, provides structural support, and maintains a compact form factor. This multi-functionality reduces the need for separate components, simplifying overall device complexity.
Solution Approach 2:
By varying the thickness parameter of the mechanical element's portions, the frequency response can be shaped without changing the fundamental structure or adding complex components. The alternating thin and thick portions create specific acoustic resonances and filtering characteristics through parameter variation alone.
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 mechanical element enhances sound transmission, adjusts frequency response, and protects against substance ingress, resulting in improved acoustic performance and reliability with a smaller form factor.
Implementation Method 1
a section in which thinner portions and thicker portions are alternatingly arranged around an axis of the structure... providing for a transmission of sound
Implementation Method 2
The frequency response of a hearing device can be affected by many parameters including the properties of various components included in the hearing device... The mechanical element enhances sound transmission, adjusts frequency response
Data Source
AI summary
The disclosure relates to a hearing device configured to be worn at an ear of a user, the hearing device comprising a sound delivery (SD) part configured to be at least partially inserted into an ear canal, the SD part comprising a sound tube having an axis in which direction sound is propagating, wherein the sound tube is acoustically coupled to an electroacoustic transducer; and a mechanical element configured to be connected to the SD part, the element comprising a structure enclosing a cavity with an opening facing the SD part when the element is connected to the SD part such that the cavity is acoustically coupled to the electroacoustic transducer.