Slim Loudspeaker Magnetic Fluid Distribution
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Solution Overview
Problem
Conventional slim loudspeakers face issues with reduced low-frequency characteristics and reproduction frequency bandwidth due to increased stiffness and local concentration of magnetic fluid, leading to air gaps and rolling in the magnetic gap.
Innovation Solution
A loudspeaker design that includes a magnetic circuit with a magnet, plate, and yoke, featuring a voice coil in a magnetic gap with a magnetic fluid uniformly distributed between the voice coil and the plate or yoke, utilizing a sound hole configuration to ensure even magnetic flux distribution and prevent air gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the width of the loudspeaker is narrowed to achieve a slim design, then the appearance is improved and space utilization is increased, but the stiffness of the suspension increases and the minimum resonant frequency increases, degrading low-frequency characteristics
Solution Approach 1:
The patent applies local quality by providing suspensions only at specific locations (front and rear sides) rather than uniformly around the entire circumference of the diaphragm. This localized suspension arrangement allows the loudspeaker to maintain sufficient width at critical points while achieving an overall slim profile, thereby resolving the contradiction between narrow width and low-frequency performance.
2Reliability
If magnetic fluid is filled in the magnetic gap to prevent rolling and improve low-frequency characteristics, then the magnetic fluid may be locally concentrated causing air gaps and degradation of low-frequency characteristics
Solution Approach 1:
The patent applies parameter changes by carefully controlling the filling amount and distribution of magnetic fluid in the magnetic gap. By optimizing the volume and positioning of magnetic fluid, the system achieves uniform distribution that prevents both rolling and air gaps, thereby improving low-frequency characteristics without causing local concentration issues.
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 uniform distribution of magnetic fluid prevents air gaps and rolling, maintaining low-frequency characteristics and reducing the risk of sound leakage, thereby enhancing the loudspeaker's performance and reliability even in slim designs.
Implementation Method 1
a magnetic fluid filled in at least one of a gap between the voice coil and the plate and a gap between the voice coil and the yoke
Data Source
AI summary
A loudspeaker is provided which includes: a magnetic circuit including a magnet having at least one hole, a plate fixed to one of a pair of polar surfaces of the magnet, and a box-shaped yoke having an inner bottom surface fixed to the other polar surface of the magnet; a voice coil vertically vibratably provided in a magnetic gap formed by the plate and the yoke; a diaphragm having a peripheral edge connected to an upper end of the voice coil; and a magnetic fluid filled in at least one of a gap between the voice coil and the plate and a gap between the voice coil and the yoke. The loudspeaker includes at least one means for uniformly distributing the magnetic fluid.