Speaker Acoustic Membrane Liquid Ejection via Controlled Vibration
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Solution Overview
Problem
Electronic devices with speakers face operational issues when liquid enters the speaker duct, as conventional methods struggle to efficiently remove the liquid, leading to reduced sound output.
Innovation Solution
The electronic device employs a processor-controlled acoustic module with a coil and membrane to apply specific signals, changing the vibration plate's momentum over time to force out liquid from the speaker duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid enters the speaker duct, then the speaker can still vibrate and produce sound, but the sound output volume decreases and liquid damage occurs
Solution Approach 1:
The patent applies mechanical vibration to the vibration plate through controlled oscillation signals to generate centrifugal force that propels liquid droplets out of the speaker duct. The vibration plate oscillates in a direction substantially perpendicular to the speaker duct, creating dynamic motion that overcomes surface tension and gravitational forces holding the liquid inside the duct, thereby preventing liquid damage while maintaining speaker operational reliability
Solution Approach 2:
The patent changes the operational parameters of the vibration plate by adjusting oscillation frequency and amplitude based on detected liquid presence. When liquid is detected in the speaker duct, the system increases the oscillation intensity to an optimal range that effectively ejects liquid without causing mechanical damage to the speaker components, thus resolving the contradiction between reliability and liquid damage prevention
2Productivity
If the vibration plate moves repeatedly to remove liquid, then liquid can be partially removed, but removal efficiency is low due to the duct's acoustic signal transmission structure
Solution Approach 1:
The patent transforms the conventional low-efficiency repeated movement method into high-efficiency oscillatory vibration. By driving the vibration plate to oscillate at specific frequencies perpendicular to the duct axis, the system generates centrifugal and inertial forces that rapidly eject liquid droplets, achieving efficient liquid removal (productivity improvement) without modifying the speaker duct's acoustic structure (avoiding increased device complexity)
Solution Approach 2:
The patent employs periodic oscillation of the vibration plate at controlled frequencies to create cyclic centrifugal forces that continuously propel liquid outward. This periodic action is more efficient than aperiodic repeated movements, as it maintains consistent ejection force through rhythmic oscillation, thereby improving liquid removal efficiency while preserving the original speaker duct design
3Productivity
If the vibration plate oscillates with high intensity to force out liquid, then liquid removal efficiency improves, but the speaker may suffer mechanical damage
Solution Approach 1:
The patent dynamically adjusts the oscillation parameters (frequency and amplitude) of the vibration plate based on liquid detection results. When liquid is present, the system increases oscillation intensity to optimal levels that maximize liquid ejection efficiency. The control unit monitors and regulates these parameters to ensure they remain within safe mechanical limits, preventing damage to the speaker components while maintaining high liquid removal efficiency
Solution Approach 2:
The patent implements a feedback control mechanism where the control unit receives signals from liquid detection units and adjusts the vibration plate's oscillation parameters accordingly. This closed-loop control ensures that high-intensity oscillation is applied only when liquid is detected and at levels that are effective for removal but below the threshold for mechanical damage, thus resolving the contradiction between productivity and strength
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 method effectively removes liquid from the speaker duct, ensuring the device maintains normal sound output and operation even when exposed to moisture.
Implementation Method 1
an acoustic module disposed in an internal space of the housing and the acoustic module comprising a coil and an acoustic membrane, the acoustic membrane being movable based on a signal applied to the coil
Implementation Method 2
apply a first signal to the coil via the amplifier to move the acoustic membrane in a first direction by a first distance to force out at least a portion of liquid introduced into at least a portion of the internal space to the outside of the internal space using the acoustic membrane
Data Source
AI summary
An electronic device includes a memory, a housing, an acoustic module comprising a coil and an acoustic membrane configured to be movable based on a signal applied to the coil, the acoustic module being disposed in an internal space of the housing, an amplifier, and a processor. The memory may store instructions that when executed by the processor cause the processor to apply a first signal to the coil through the amplifier to move the acoustic membrane in a first direction by a first distance and applying a second signal to the coil through the amplifier to move the acoustic membrane in a second direction different from the first direction and/or to move the acoustic membrane by a second distance different from the first distance after applying the first signal to the coil.