Microphone Port Perforations for Foreign Material Protection
Solution Overview
Problem
Existing microphone ports in electronic devices are complex and bulky, prone to clogging, and introduce potential leak paths for internal noise due to multiple layers, which fail to effectively prevent liquid and dirt intrusion while maintaining sound quality.
Innovation Solution
A microphone port formed by perforations in the microphone substrate or associated layers, such as a flexible printed circuit, with smaller microperforations to block foreign materials and larger openings to prevent clogging, providing a shielded microelectromechanical systems microphone device and integrated circuit with sound passageways that resist contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple layers with small openings are used to prevent liquid and dirt intrusion, then foreign material protection is improved, but device complexity and bulk increase
Solution Approach 1:
The protective structure is segmented into multiple perforation layers with different opening sizes within a single integrated component. The first layer has first perforations and the second layer has second perforations, creating a multi-level filtration system without requiring separate protective components for each function.
Solution Approach 2:
The solution implements a nested structure where one perforated layer is positioned within another perforated layer. The first perforated layer and second perforated layer are arranged such that they overlap to form sound passageways, creating a compact nested arrangement that provides multiple protective functions in a single integrated structure.
2Object-affected harmful factors
If small openings are used to block foreign materials, then liquid and dirt intrusion is prevented, but the openings are susceptible to clogging
Solution Approach 1:
Different regions of the protective structure have different opening sizes tailored to specific functions. The first perforated layer has first perforations of a certain size while the second perforated layer has second perforations of a different size, allowing each layer to address specific aspects of contamination while collectively providing clogging resistance.
Solution Approach 2:
The solution adds a dimensional aspect by implementing perforations in multiple layers stacked in the vertical dimension. Instead of relying on a single plane of openings, the protective structure extends through multiple layers with sound passageways formed by overlapping openings, providing both filtration and anti-clogging properties through this multi-dimensional arrangement.
3Object-affected harmful factors
If multiple layers are used for protection, then foreign material blocking is improved, but potential leak paths for internal noise are introduced
Solution Approach 1:
The solution merges the protective function with the acoustic function by integrating the perforated layers into the sound port structure itself. The first and second perforated layers are combined to form sound passageways that allow acoustic energy to pass through while blocking foreign materials, eliminating the need for separate protective components that would create additional leak paths.
Solution Approach 2:
The perforated layer structure serves multiple functions simultaneously: it blocks foreign materials like liquid and dirt, provides mechanical protection for the microphone, and maintains acoustic transparency by forming sound passageways. This multi-functional design eliminates the need for additional separate components that would otherwise be required for each function.
Data Source
AI summary
An electronic device may be provided with a microphone in a microphone port. A shield may cover a microelectromechanical systems microphone device on a microphone substrate. An opening in the microphone substrate may form a sound port for the microphone. The microphone port may be formed by perforations in the microphone substrate or other layers such as a flexible printed circuit layer, a sheet metal layer, a layer of adhesive, a flexible polymer carrier layer in an adhesive tape, or an electronic device housing. The perforations may be sufficiently small to help resist the intrusions of foreign material such as liquid and dirt into the sound port of the microphone. Larger openings may be formed in other structures such as an electronic device housing. The larger openings may serve as sound passageways for the microphone port while being sufficiently large to resist clogging.