Loudspeaker Magnetic Circuit Isolation for Lower Shell Vibration
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Solution Overview
Problem
The excessive vibration of the shell in loudspeakers due to the reverse acting force and ampere force on the magnetic circuit structure affects sound quality and user experience.
Innovation Solution
A loudspeaker design that includes a bridging structure separating the magnetic circuit structure from the shell, utilizing main and auxiliary voice coils with opposite acting forces, and a yoke connected to the shell through cantilevers, to reduce the impact force on the shell during sound generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the magnetic circuit structure is directly connected to the shell, then the structural stability is improved, but the shell vibration and sound quality deteriorate due to reverse acting force transmission
Solution Approach 1:
A bridging structure is introduced as an intermediary component between the magnetic circuit structure and the shell. This bridging structure includes elastic supporting elements that provide mechanical connection while isolating vibration transmission, thus resolving the contradiction between structural stability and shell vibration reduction
Solution Approach 2:
The connection between the magnetic circuit structure and the shell is segmented through the bridging structure, which divides the rigid direct connection into multiple flexible connection points. This segmentation allows the system to maintain structural integrity while reducing vibration transmission to the shell
2Object-affected harmful factors
If the magnetic circuit structure is separated from the shell using a bridging structure, then the shell vibration is reduced, but the structural stability may deteriorate
Solution Approach 1:
The bridging structure utilizes elastic supporting elements with specific elasticity parameters that allow it to provide adequate mechanical support while filtering out vibration frequencies that cause shell resonance. By carefully selecting the elasticity parameters, both vibration reduction and structural stability are achieved
3Device complexity
If only a main voice coil is used, then the device complexity is reduced, but the ability to counteract magnetic circuit structure vibration is insufficient
Solution Approach 1:
An auxiliary voice coil is added to generate a counteracting electromagnetic force that opposes the vibration of the magnetic circuit structure. This auxiliary coil acts as a counterweight in the electromagnetic domain, actively canceling out the harmful vibrations while the main voice coil handles the primary sound generation
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
Effectively reduces the vibration of the magnetic circuit structure transmitted to the shell, ensuring better sound quality and reducing excessive shell vibration.
Implementation Method 1
When the alternating current is communicated, the voice coil drives the vibration structure to vibrate and sound under the action of the ampere force
Implementation Method 2
the magnetic circuit structure constituted by the magnetic pole piece, the magnet and the yoke is subjected to a reverse acting force, the reverse acting force and the ampere force to which the voice coil is subjected are equal in magnitude and opposite in direction
Data Source
AI summary
Provided is a loudspeaker. The loudspeaker includes a shell, a vibration structure, a magnetic circuit structure, a voice coil and a bridging structure. The vibration structure is disposed on the shell. The magnetic circuit structure includes a yoke and a magnetic pole structure disposed on the yoke. The voice coil is connected to the vibration structure and is movable relative to the magnetic circuit structure. The yoke is connected to the shell through the bridging structure, and when the loudspeaker is in sound generating operation, the magnetic circuit structure is configured to vibrate independently relative to the shell under a separation of the bridging structure.