Active Acoustic Shutter for Pressure Shock Protection
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Solution Overview
Problem
Acoustic components in electronic devices, such as microphones and speakers, face challenges in withstanding environmental shocks and pressure differentials, leading to potential damage from air bursts and impacts, as traditional protection methods like acoustic meshes are inadequate in preventing substantial pressure waves from passing through.
Innovation Solution
An active acoustic protection system that utilizes a mechanism to close acoustic passages in response to pressure differentials or motion sensors, employing actuators like solenoids or MEMs systems to create a mechanical seal, reducing the risk of damage by isolating sensitive components from external acoustic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic mesh or foam materials are used to protect acoustic components, then acoustic shock protection is improved, but sound quality deteriorates due to material interference with acoustic field
Solution Approach 1:
The harmful acoustic mesh material is removed from the acoustic passage. Instead, a mechanical shutter is introduced that can be opened to allow direct acoustic coupling and closed to provide protection, eliminating the need for sound-quality-degrading materials while maintaining both protection and acoustic performance
Solution Approach 2:
The acoustic passage protection mechanism is made dynamic through the use of a controllable shutter that can transition between open and closed states. This allows the system to adapt between protection mode (shutter closed) and normal operation mode (shutter open), whereas traditional mesh materials provide static, always-present protection that degrades sound quality
2Reliability
If acoustic mesh and foam materials are placed in acoustic passages, then protection against water intrusion and contamination is improved, but acoustic performance deteriorates across different frequency ranges
Solution Approach 1:
The harmful foam and mesh materials are extracted from the acoustic passage. The mechanical shutter provides protection against water intrusion and contamination when closed, while eliminating the acoustic performance degradation caused by these materials when the shutter is open during normal operation
Solution Approach 2:
The protection mechanism transitions from static (always-present mesh/foam) to dynamic (controllable shutter). The shutter can be closed to provide environmental protection and opened to restore full acoustic performance, allowing the system to adapt to different operational requirements without permanent degradation
3Device complexity
If traditional acoustic protection materials are used, then design simplicity is maintained, but the ability to withstand substantial pressure differentials deteriorates
Solution Approach 1:
The shutter is positioned in advance within the acoustic passage and can be rapidly closed before substantial pressure differentials occur. This preliminary positioning allows the system to respond quickly to impact or air burst events, providing protection against pressure differentials that traditional materials cannot withstand
Solution Approach 2:
The passive mechanical protection of mesh and foam materials is replaced with an active mechanical shutter system controlled by sensors and actuators. This substitution enables the system to withstand substantial pressure differentials through rapid shutter closure while maintaining relatively simple device architecture
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 active protection system effectively reduces the risk of damage to acoustic components by substantially isolating them from overpressure and underpressure, enhancing their service life and robustness in various environmental conditions.
Implementation Method 1
a motion sensor in signal communication with the actuated mechanism or controller, or both, operable to generate a sensor signal indicative of motion of the device
Implementation Method 2
The actuator (or actuated mechanism) can utilize a solenoid or other electromagnetic actuator operable to close the acoustic passage by operation of a shutter or valve
Implementation Method 3
In other designs, a microelectricalmechanical (MEMs) system or solid state actuator can be used, for example where the acoustic aperture is defined through the MEMs device or solid state actuator chip
Data Source
AI summary
A device comprises a housing, an acoustic component coupled to an exterior of the device through an acoustic passage in the housing, and an actuated mechanism operable to close the acoustic passage between the acoustic component and the housing. The actuated mechanism is operable to close the acoustic passage in response to a control signal, where the control signal is indicative of a pressure differential transmittable from the exterior of the device through the acoustic passage to the acoustic component.