Speaker Box Magnetic Circuit Coupling Valve for Sound Leakage Control
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Solution Overview
Problem
Existing speaker boxes lack effective control over sound leakage and air pressure balance, leading to limited acoustic performance, especially when used as caller receivers during phone calls.
Innovation Solution
A speaker box design featuring a magnetic circuit coupling valve with a negative stiffness diaphragm, which controls leakage holes in the bottom cover to optimize sound leakage control and enhance acoustic isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a vent with valve is provided in the housing to enable air pressure balance and heat dissipation, then air pressure balance and heat dissipation are improved, but sound leakage control is insufficient
Solution Approach 1:
The vent is divided into multiple leakage holes distributed across the bottom cover, allowing independent control of each hole through the magnetic circuit coupling valve. This segmentation enables precise control over air pressure balance while minimizing sound leakage by opening only the necessary holes.
Solution Approach 2:
The magnetic circuit coupling valve acts as an intermediary mechanism between the control signal and the leakage holes. It uses a negative stiffness diaphragm and electromagnetic field to precisely control the opening and closing of each leakage hole, achieving both air pressure balance and sound leakage control.
2Device complexity
If the valve control structure is simplified without specific devices, then device complexity is reduced, but control performance and response speed are insufficient
Solution Approach 1:
The traditional mechanical valve control system is replaced with a magnetic circuit coupling valve that uses electromagnetic fields to control the negative stiffness diaphragm. This substitution eliminates complex mechanical linkages and achieves faster response speed through direct electromagnetic actuation.
Solution Approach 2:
The magnetic circuit coupling valve changes the state of the diaphragm by controlling electromagnetic field parameters. By adjusting the electromagnetic field strength, the diaphragm can be precisely controlled to open or close the leakage holes, achieving fast and accurate control response.
3Object-generated harmful factors
If the rear cavity is sealed to improve acoustic isolation, then acoustic performance is improved, but air pressure balance and heat dissipation are compromised
Solution Approach 1:
The leakage holes are designed to be dynamically controllable through the magnetic circuit coupling valve. The system can switch between sealed and vented states based on operational requirements, allowing the rear cavity to maintain acoustic isolation during playback while enabling heat dissipation during operation.
Solution Approach 2:
The magnetic circuit coupling valve enables continuous control of the leakage holes, allowing the system to maintain optimal conditions for both acoustic isolation and heat dissipation. The valve can be adjusted to provide controlled ventilation that continuously balances acoustic performance and thermal management.
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 speaker box achieves improved acoustic performance by accurately controlling the communication of the rear cavity with the outside, optimizing sound leakage, and enhancing acoustic isolation.
Implementation Method 1
The coil receives an external control signal and generates an electromagnetic field with the secondary magnet to drive the negative stiffness diaphragm to abut on and seal the one or more leakage holes to a closed state, or drive the negative stiffness diaphragm to separate from the one or more leakage holes to make the one or more leakage holes open
Implementation Method 2
a negative stiffness diaphragm fixed to the support and a coil fixed on a side of the negative stiffness diaphragm close to the secondary magnet and separated from the secondary magnet. The negative stiffness diaphragm faces to and is separated from the one or more leakage holes
Data Source
AI summary
The present invention provides a speaker box including a housing, a sound unit and a magnetic circuit coupling valve. The sound unit includes a bracket, a vibration system and a magnetic circuit system including a secondary magnet. The housing includes a bottom cover having leakage holes. The magnetic circuit coupling valve is accommodated in a rear cavity and includes a support, a negative stiffness diaphragm and a coil. The negative stiffness diaphragm faces to the leakage holes. The coil receives an external control signal and generates an electromagnetic field with the secondary magnet to drive the negative stiffness diaphragm to seal the leakage holes, or make the leakage holes open, or make the leakage holes partially open or closed. Compared with a related technology, the speaker box has fine acoustic performance and is able to accurately control communication of a rear cavity with the outside.