Speaker Module Resonance Cavity Using Shield Can and Through Hole
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Solution Overview
Problem
Audio signals in low audio frequency bands require a large space to generate resonance phenomena due to their long wavelengths, which can cause vibrations with large amplitudes, posing challenges in designing electronic devices with limited spaces.
Innovation Solution
The electronic device includes a housing with a support defining a through hole, a speaker module, a shield can spaced apart from the speaker module in the second direction with a connecting structure positioned in the second direction with respect to the through hole, connecting a first space between the speaker and the enclosure and a second space between the PCB and the shield can via the through hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large space is provided for low audio frequency resonance, then resonance quality is improved, but device size increases
Solution Approach 1:
The patent merges the first space (between speaker and enclosure) and the second space (between PCB and shield can) into a single resonant cavity through the connecting structure. This allows both spaces to work together to provide sufficient resonance volume for low audio frequencies without increasing the overall device footprint, as the spaces are stacked vertically rather than requiring horizontal expansion.
Solution Approach 2:
The patent utilizes the vertical dimension (thickness direction of the device) to accommodate the resonant cavity. By connecting spaces in the thickness direction rather than spreading them out horizontally, the design achieves sufficient resonance volume without increasing the device's length or width, effectively moving the solution from 2D plane to 3D space utilization.
2Reliability
If spaces are connected for resonance, then low audio frequency output is improved, but structural complexity increases
Solution Approach 1:
The shield can serves multiple functions: it shields electronic components from electromagnetic interference and simultaneously forms part of the resonant cavity structure. The connecting structure both mechanically connects components and provides acoustic coupling between spaces. This multi-functionality reduces the need for separate dedicated resonance chambers and connecting passages, simplifying the overall structure.
Solution Approach 2:
The existing structural components (enclosure, shield can, connecting structure) are designed to serve dual purposes: their primary functions plus resonance cavity formation. Rather than adding separate resonance chambers and connecting tubes, the design makes the necessary structural elements also serve as the resonant system, eliminating redundant components and simplifying manufacturing.
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 connecting structure effectively manages resonance of audio signals by connecting the first and second spaces, reducing vibrations and optimizing space utilization in the electronic device.
Implementation Method 1
a second space between the PCB and the shield can, wherein a third internal volume is a third space between the connecting structure and the cover sheet, to connect the first space and the second space via the through hole, for resonance of the audio signal
Data Source
AI summary
An electronic device includes: a housing comprising a support defining a through hole; a display positioned in a first direction with respect to the support; a speaker module in the housing and in a second direction opposite to the first direction with respect to the support; a shield can spaced apart from the speaker module in the second direction and covering electronic components disposed on a printed circuit board (PCB), and a connecting structure positioned in the second direction with respect to the through hole, the connecting structure being in contact with a first side of the enclosure at least partially surrounding the first internal volume and being in contact with a second side of the shield can at least partially surrounding the second internal volume.