Speaker Dual-Damper Coil Alignment for Large-Amplitude Vibration
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Solution Overview
Problem
The coil in a speaker vibrates not only vertically but also horizontally, leading to potential contact with surrounding components and causing abnormal sound or damage, especially at large amplitudes.
Innovation Solution
A speaker design incorporating a first damper near the upper end and a second damper near the lower end of the coil, providing restoring forces opposite to the swing direction to minimize horizontal movement, ensuring the coil axis aligns with the magnetic assembly axis during vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the coil vibrates with large amplitude to improve sound output, then the sound volume increases, but the coil may touch surrounding components causing abnormal sound and damage
Solution Approach 1:
The patent applies preliminary anti-action by installing dampers before the coil can swing and touch surrounding components. The dampers are positioned to provide restoring forces that counteract the coil's horizontal swinging motion before it reaches a position where contact with surrounding components could occur, thus preventing abnormal sound and potential damage while allowing large amplitude vibrations for high sound output
2Adaptability or versatility
If the coil swings horizontally with large amplitude, then the sound coverage increases, but the coil axis deviates from the magnetic assembly axis causing sound distortion
Solution Approach 1:
The patent uses the damper mechanism as a counterbalancing system. The dampers provide restoring forces that act opposite to the horizontal swinging motion of the coil, effectively counterweighting the tendency of the coil to deviate from its central position. This allows the coil to achieve larger vibration amplitudes for broader sound coverage while the dampers continuously correct the alignment, maintaining the coil axis overlapping with the magnetic assembly axis and preventing sound distortion
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
Reduces coil roll swinging amplitude, preventing coil contact with other components, minimizing sound distortion, and allowing for a thinner speaker design with improved compliance and reduced resonance frequency.
Implementation Method 1
the first damper arranged close to the upper end of the coil may provide, for the upper end of the coil, a first restoring force whose direction is opposite to a swing direction of the coil
Implementation Method 2
The first damper is configured to support the vibrating assembly in a radial direction of the first damper
Implementation Method 3
A speaker may convert electrical energy into acoustic energy to implement sound output through electroacoustic conversion. In the speaker, an energized coil may drive, under an action of a magnetic field provided by a magnet, a diaphragm to vibrate
Data Source
AI summary
A speaker in which an end of a magnetic assembly close to the diaphragm has a magnetic gap. A coil is wound around a coil former, and at least a portion of the coil is located in the magnetic gap. A connecting member is arranged on a side of the coil former close to a side wall of the accommodating cavity. An annular first damper is arranged between the coil former and the connecting member. The first damper is close to an upper end of the coil and is distal from a lower end of the coil. An annular second damper is arranged between the connecting member and the side wall of the accommodating cavity. The second damper is close to the lower end of the coil and is distal from the upper end of the coil.