Speaker Assembly Back Volume Optimization
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Solution Overview
Problem
Electronic devices face challenges in maintaining broad frequency range and acoustic performance due to limited space for back volume in speaker assemblies, which affects the stiffness of the diaphragm and overall sound production.
Innovation Solution
The design includes a speaker module with a speaker enclosure that defines a speaker volume, utilizing a support rib to divide the volume and direct air flow, and a sealing film to isolate the speaker volume from the ambient environment, allowing for increased back volume while minimizing space occupied by the speaker assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the back volume of the speaker assembly is increased to improve acoustic performance and reduce diaphragm stiffness, then the space occupied by the speaker assembly increases, which conflicts with the goal of reducing device dimensions
Solution Approach 1:
The speaker assembly is divided into separate functional components: the speaker module containing the diaphragm and voice coil, and the speaker enclosure defining the back volume. This segmentation allows the back volume to be optimized for acoustic performance while the overall assembly footprint is minimized by strategic placement within the device housing.
Solution Approach 2:
The speaker enclosure is nested within the device housing, utilizing the housing walls to form part of the back volume boundaries. This nesting approach maximizes the back volume available for acoustic performance without proportionally increasing the overall device dimensions, as the housing structure serves dual purposes.
2Reliability
If the diaphragm size is increased to improve low frequency audio performance, then the diaphragm becomes stiffer with smaller back volume, requiring more power to produce desired output
Solution Approach 1:
The system optimizes the relationship between diaphragm size and back volume by adjusting the back volume parameter to compensate for diaphragm stiffness. By maintaining an optimal back volume-to-diaphragm-area ratio, the system achieves desired low frequency response without excessive power requirements, balancing mechanical and acoustic parameters.
3Volume of stationary object
If the speaker assembly is miniaturized to reduce device size, then the back volume is reduced, which negatively impacts acoustic performance and diaphragm flexibility
Solution Approach 1:
The speaker enclosure is designed with an extended depth dimension, utilizing the thickness direction of the device to maximize back volume. By orienting the enclosure depth perpendicular to the device front face, the design achieves adequate back volume for acoustic performance while maintaining a compact footprint in the planar dimensions.
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 configuration enhances acoustic performance by maximizing the speaker volume, reducing the thickness of the speaker enclosure, and maintaining desired acoustic quality within the constraints of reduced device dimensions.
Implementation Method 1
a speaker module positioned in the internal volume and in fluid communication with the speaker volume
Implementation Method 2
utilizing a support rib to divide the volume and direct air flow
Implementation Method 3
a sealing film to isolate the speaker volume from the ambient environment
Data Source
AI summary
An electronic device can include a housing defining an aperture and a display positioned in the aperture. The display and the housing can define an internal volume in which a speaker assembly is positioned. The speaker assembly can include a speaker module and a speaker enclosure in fluid communication, with the speaker enclosure at least partially defining a speaker volume.