Elastic Damping Element for Hearing Instrument Feedback Reduction
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Solution Overview
Problem
Hearing instruments, particularly ITE devices, face challenges with acoustic feedback due to their small size, leading to impaired sound quality and unpleasant whistling noises, which can also pose a risk to the user's hearing.
Innovation Solution
The design incorporates a damping body made of elastic material with a sound nozzle positioned at a specific angle and a support plate that rests on the canal section's shoulder, effectively reducing vibrations and acoustic feedback by positioning the listener deep in the ear canal while being easy to manufacture using conventional processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hearing instrument is designed as a small ITE device, then it can be worn comfortably in the ear, but acoustic feedback occurs leading to whistling noises and impaired sound quality
Solution Approach 1:
A damping element made of elastic material is introduced as an intermediary component between the receiver and the ear canal. This damping element absorbs vibrations and acoustic energy, preventing the acoustic feedback loop that causes whistling noises while maintaining the compact ITE form factor.
Solution Approach 2:
The damping element is constructed from an elastic material that forms a flexible structure within the canal section. This flexible damping structure adapts to the ear canal geometry while providing vibration absorption and acoustic feedback reduction without adding significant size to the device.
2Object-generated harmful factors
If the damping element is complexly shaped to fit the ear canal, then acoustic feedback is reduced, but manufacturing difficulty increases
Solution Approach 1:
The damping element is divided into distinct functional sections: a bulbous main body for vibration absorption, a canal section for fitting the ear canal geometry, and a support plate for structural support. This segmentation allows each part to be optimized for its specific function while simplifying the overall manufacturing process through modular construction.
Solution Approach 2:
The main body of the damping element is given a bulbous, curved shape that naturally conforms to the anatomy of the ear canal. This spherical/curved geometry provides effective acoustic damping while being amenable to conventional manufacturing processes such as injection molding, avoiding the need for complex machining or assembly.
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 solution significantly reduces the risk of acoustic feedback while maintaining listening quality and ease of manufacturing, ensuring a stable and effective hearing instrument.
Implementation Method 1
designed to mount a receiver (28) of the hearing instrument in a vibration-damping manner
Implementation Method 2
damping element (44) made of an elastic material
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
A hearing instrument (2, 2`) is described, comprising a housing (4, 4') that is wearable in a user's ear and has a concha section (6) and a thin canal section (8) projecting from the concha section (6). The canal section (8) has a doubly curved shape to conform to the anatomy of the human ear canal. The hearing instrument (2, 2`) includes a damping element (44) made of an elastic material, inserted into the canal section (8), for vibration-damping support of a receiver (28). The damping element (44) has a pocket (46) for receiving the receiver (28) and a sound port (50) adjoining it. The sound nozzle (50) is positioned by forming a bend in the damping body (44) at a first angle (W1) to a longitudinal axis of the pocket (46) and ends at its end away from the pocket (46) in a support plate (54) which rests against a shoulder (56) of the canal section (8).The support plate (54) is in turn inclined to an axis of the sound nozzle (50).