Hearing Device Loudspeaker Box Without Sound Tube
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Solution Overview
Problem
High-performance hearing aids experience pumping effects and feedback due to structure-borne and airborne sound, reducing gain and causing vibrations that affect microphone components.
Innovation Solution
A hearing device design without a sound conducting element between the loudspeaker and sound outlet, featuring a loudspeaker with an open front volume and rigid connection to a damping mat, which reduces vibration transmission and prevents feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible sound conducting element is used to connect the loudspeaker to the sound outlet, then the loudspeaker can be effectively coupled to the sound outlet, but pumping effects occur that reduce the achievable gain
Solution Approach 1:
The patent removes the flexible sound conducting element (sound tube) from the system entirely. Instead of using a tube to connect the loudspeaker to the sound outlet, the loudspeaker is positioned within the housing such that its sound output opening directly faces the sound outlet opening, eliminating the intermediary flexible element that caused pumping effects and gain reduction.
2Object-generated harmful factors
If the loudspeaker is placed in an additional enclosure (loudspeaker box) to prevent structure-borne sound transmission, then feedback is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the loudspeaker housing with the main device housing, eliminating the need for a separate loudspeaker box. The loudspeaker is accommodated within the existing housing structure, and the housing itself serves as the enclosure that prevents structure-borne sound transmission to other components while reducing overall device complexity.
3Object-generated harmful factors
If the loudspeaker is suspended by an elastomer cover to prevent vibration transmission, then structure-borne sound is reduced, but the loudspeaker positioning flexibility is reduced
Solution Approach 1:
The patent removes the elastomer cover suspension system entirely. Instead of suspending the loudspeaker to reduce vibration transmission, the housing structure itself is designed to accommodate the loudspeaker in a fixed position that naturally prevents structure-borne sound transmission, eliminating the need for additional vibration isolation components.
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 design minimizes pumping effects and feedback, enhancing sound sensitivity in the high-frequency range and reducing vibrations, thereby improving sound output and reducing noise interference with microphone components.
Implementation Method 1
a loudspeaker (6) having a loudspeaker diaphragm (24) for generating acoustic signals and a drive (25) acting on the loudspeaker diaphragm
Implementation Method 2
The loudspeaker is rigidly connected to a damping mat (14), which reduces vibration transmission
Data Source
AI summary
A hearing device includes a loudspeaker having a loudspeaker diaphragm for generating acoustic signals, a drive or actuator acting on the loudspeaker diaphragm, and a loudspeaker housing in which the drive or actuator and the loudspeaker diaphragm are accommodated. A housing encloses a housing interior. A loudspeaker box is disposed in the housing interior and has a sound outlet opening coupled with a sound conductor leading out of the housing. The loudspeaker is sealed in the loudspeaker box against the housing interior in a fluid-tight manner. The loudspeaker is disposed in the loudspeaker box clear or free of a sound channel element, disposed within the loudspeaker box and coupling the loudspeaker with the sound outlet opening.