Receiver Assemblies with Shared-Wall Acoustic Channels
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Solution Overview
Problem
In-ear devices face challenges in modifying frequency response while maintaining a minimal increase in length, which affects comfort and fit rate due to the unique anatomy of individual ear canals and the limitations of existing acoustic channels.
Innovation Solution
The integration of an acoustic channel that shares one or more surfaces with the receiver, allowing for a reduction in the overall length of the receiver and channel system by common length, and utilizing a balanced armature motor with a displaceable diaphragm and varying acoustic mass to modify resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an acoustic channel is added to modify frequency response, then acoustic performance is improved, but device length increases
Solution Approach 1:
The patent merges the acoustic channel with the receiver housing by making the housing walls form portions of the acoustic channel boundaries. Specifically, the first wall and second wall of the receiver housing define boundaries of the acoustic channel, eliminating the need for separate channel structures and reducing overall device length while maintaining acoustic performance.
Solution Approach 2:
The patent utilizes the radial dimension of the receiver housing to create the acoustic channel path. Instead of extending the channel axially (lengthwise), the sound waves travel through a path defined by the housing walls in a radial or circumferential direction, effectively using unused spatial dimensions to achieve the required acoustic path length without increasing device length.
2Adaptability or versatility
If device length is reduced for better fit rate, then comfort is improved, but frequency response modification capability is reduced
Solution Approach 1:
The receiver housing serves dual functions: as the structural enclosure for the receiver components and as the acoustic channel structure. The housing walls themselves form the acoustic channel boundaries, combining two functions into one structure, thereby maintaining frequency response modification capability while minimizing device length for better fit rate.
Solution Approach 2:
The receiver housing is designed as a multi-functional component that simultaneously provides mechanical protection, structural support, and acoustic channel functionality. This universal design allows the same structure to fulfill multiple roles, eliminating the need for additional components that would increase device length and reduce fit rate.
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 approach enhances the fit rate of in-ear devices by effectively modifying frequency response without increasing device length, thereby improving comfort and acoustic performance.
Implementation Method 1
In a simple analysis, this acoustic transmission line can be represented by a simple inertance (mass), which allows for shifting the frequency of the acoustic resonance by adding inertance to the system, by means of an acoustic channel
Implementation Method 2
The acoustic channel creates an additional acoustic load upon the receiver, thereby modifying its output
Implementation Method 3
The acoustic channel (viewed as a transmission line) will introduce a time delay between the acoustic outlet and the port, equal to the effective length of the acoustic channel divided by the speed of sound
Implementation Method 4
at smaller dimensions, the acoustic wave begins to exchange heat with the walls of the acoustic channel, thereby attenuating the wave
Implementation Method 5
A first acoustic pressure is generated in the front volume as the balanced armature motor moves the diaphragm
Data Source
AI summary
A receiver is provided having a balanced armature motor mechanically interconnected to a displaceable diaphragm component. A front volume changes as the displaceable diaphragm component moves. The front volume is connected to a port. A rear volume changes oppositely to the front volume as the displaceable diaphragm moves. An acoustic channel connects to the port and is also connected to a sound outlet. The sound outlet allows acoustic energy to exit from the acoustic channel. A first acoustic pressure is generated in the front volume as the balanced armature motor moves the diaphragm. The acoustic channel and the internal volume are divided by a common wall section, wherein the common wall section is defined by at least one of the walls of the housing which also provides a portion of at least one wall for the acoustic channel.