Logic Board Speaker with Hermetic Acoustic Cavity
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Solution Overview
Problem
As portable consumer electronics devices become more compact, the limited space within system enclosures poses a challenge for integrating speakers effectively, as traditional lateral mounting of speakers occupies valuable vertical space and compromises low-frequency audio output.
Innovation Solution
Mounting a loudspeaker directly on the main logic board with a hermetic seal to create an integrated acoustic cavity, which includes a back volume between the loudspeaker and the main logic board, and using a compressible seal to direct sound efficiently outward, while also incorporating a multi-chamber back volume for enhanced low-frequency output and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If speakers are mounted laterally to the main logic board, then adequate back volume for low-frequency output is achieved, but vertical space within the system enclosure is compromised
Solution Approach 1:
The patent merges the speaker assembly with the main logic board by mounting the speaker directly onto the board, integrating two previously separate components (speaker and logic board) into a single spatial configuration. This integration allows the speaker to share vertical space with the logic board while maintaining adequate back volume through the sealed cavity formation, thereby resolving the contradiction between space efficiency and low-frequency output capability
Solution Approach 2:
The speaker assembly is nested within the vertical space above the main logic board, with the speaker housing positioned to utilize the space between the logic board and the system enclosure top case. The back volume is nested within the sealed cavity formed by the logic board, speaker housing, and sealing structure, allowing adequate acoustic volume without increasing the external footprint or compromising vertical space
2Volume of moving object
If speakers are integrated onto the main logic board, then vertical space is optimized, but adequate back volume for acceptable sound quality becomes challenging
Solution Approach 1:
A sealing structure (including gaskets and adhesive seals) is introduced as an intermediary element between the speaker housing and the main logic board. This sealing structure creates an airtight sealed cavity that maintains adequate back volume for the speaker while enabling the compact integrated configuration. The seal acts as a mediator that allows the speaker to function properly in the constrained space by preventing air leakage and maintaining the necessary acoustic pressure differential
Solution Approach 2:
The patent changes the spatial parameters of the speaker assembly by reducing its lateral footprint and nesting it within the vertical space above the logic board. By adjusting the positioning and dimensions of the speaker housing and optimizing the sealed cavity volume, the design achieves adequate back volume for sound quality while maximizing vertical space utilization. The sealing structure parameters are also optimized to ensure proper acoustic isolation
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 allows for improved sound quality and increased low-frequency output while optimizing space usage, reducing noise interference by shielding electronic components and enhancing the overall performance of the speaker assembly.
Implementation Method 1
an acoustic cavity is defined between the diaphragm, the speaker housing, the hermetic seal, and the substrate
Implementation Method 2
direct the emitted sound toward the opening... such that sound can more efficiently radiate outside the system housing
Implementation Method 3
The loudspeaker may be an electrodynamic driver, and thus, may have a diaphragm that is movably connected with a speaker housing or frame to emit sound
Data Source
AI summary
A computer system having a loudspeaker mounted on a main logic board by a hermetic seal, is disclosed. More particularly, embodiments of the computer system include an acoustic cavity defined between the loudspeaker, the main logic board, and the hermetic seal. Embodiments of the computer system may include a compressible seal separated from the hermetic seal by the loudspeaker and/or the main logic board. The compressible seal may define an acoustic channel and the loudspeaker may emit sound in a high frequency range through the acoustic channel toward a system exit. Other embodiments are also described and claimed.