Loudspeaker Movable Magnet Linking Unit Low-Frequency Response
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Solution Overview
Problem
Miniaturization of electric loudspeakers is hindered by manufacturing costs and reduced low-frequency response, which limits their application in consumer devices and results in limited heat dissipation and maximum output current.
Innovation Solution
The design includes a cavity with a vibration film, a movable magnet, and a linking-up unit, such as a reed, that adjusts the magnetic field in response to electronic signals, allowing for increased current flow through coils with more turns, enhancing magnetic force and low-frequency response while maintaining sound pressure level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of electric loudspeaker is reduced for miniaturization, then the device can be applied to hand-held electronic devices, but the low frequency response decreases and heat dissipation ability is limited
Solution Approach 1:
The loudspeaker is divided into multiple independent coil assemblies, each with its own magnet and vibration film portion. This segmentation allows each coil to be optimized for specific frequency ranges, with multiple coils working together to achieve full-range sound output including low frequencies, thereby maintaining reliability while enabling miniaturization.
Solution Approach 2:
Multiple coil assemblies are arranged in a nested or compact configuration where coils are positioned at different locations around a central vibration film. This nesting approach maximizes the use of available space, allowing multiple functional elements to coexist in a minimized volume while maintaining their individual performance characteristics.
2Power
If larger current is supplied to coils to increase bass output, then low frequency response improves, but heat dissipation ability is limited due to fixed connection
Solution Approach 1:
The vibration film is divided into multiple portions, each connected to a separate coil assembly. This segmentation distributes the electrical current and thermal load across multiple independent coils rather than concentrating it in a single coil, improving heat dissipation capability while maintaining the power needed for strong bass output.
Solution Approach 2:
Instead of increasing current through a single coil in one dimension, the solution distributes multiple coils in spatial dimensions around the vibration film. This multi-dimensional arrangement allows current to be distributed across multiple pathways, reducing thermal concentration while maintaining total power output for bass response.
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 configuration improves low-frequency response and sound pressure level, reduces resonant frequency, and allows for miniaturization without compromising efficiency, overcoming the limitations of conventional loudspeakers.
Implementation Method 1
The first coil is configured to adjust the first magnetic field in the first coil according to the driving of an electronic signal. At least part of the first magnet is in the first coil, and the first magnet is movable along a first axis.
Data Source
AI summary
A loudspeaker includes a cavity, a first coil, a first magnet and a linking-up unit. The cavity includes a vibration film. The vibration film is disposed on an opening of the cavity. The first coil is configured to adjust a first magnetic field in the first coil according to the driving of an electronic signal. At least part of the first magnet is in the first coil. The first magnet is movable along a first axis. The linking-up unit is between the vibration film and the first magnet. The linking-up unit is connected to the vibration film and the magnet respectively.