Speaker Vibration Reduction Assembly Using Counteracting Mass
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Solution Overview
Problem
Speaker vibration generates unwanted noise and vibration in vehicles and other applications due to the force transmitted from moving components and acoustic pressure, which existing technologies fail to adequately mitigate.
Innovation Solution
A speaker assembly with a vibration reduction assembly that includes a mass and an actuator, where the actuator moves the mass out of phase with the voice coil to generate a force equal in magnitude and opposite in direction to the speaker's force, reducing the vibration transmitted to the mounting structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration reduction assembly is added to counteract speaker vibration, then vibration and noise are reduced, but device complexity and cost increase
Solution Approach 1:
The patent applies the counterweight principle by introducing a mass attached to the speaker assembly that generates an opposing force to cancel out the vibration forces. The mass is positioned and configured to create a counteracting force that balances the harmful vibrations, directly reducing the net vibration transmitted to the mounting structure.
Solution Approach 2:
The patent utilizes mechanical vibration principles by employing a vibration reduction assembly that includes a mass and actuator system. The assembly is designed to vibrate in opposition to the speaker's vibrations, using controlled mechanical oscillation to cancel out unwanted vibrations through destructive interference of the vibration waves.
2Object-affected harmful factors
If a complete speaker assembly with diaphragm and surround is used for vibration reduction, then vibration cancellation is effective, but size and cost increase
Solution Approach 1:
The patent applies the extraction principle by removing unnecessary components from the vibration reduction assembly. Specifically, the diaphragm and surround are omitted from the counteracting assembly, retaining only the essential elements (mass, actuator, voice coil) needed to generate the counteracting force. This reduces the size and complexity while maintaining vibration cancellation effectiveness.
Solution Approach 2:
The patent applies local quality by giving different functional characteristics to different parts of the assembly. The vibration reduction assembly has a simplified structure with a mass directly attached to the actuator mechanism, concentrating the vibration cancellation function in a compact form rather than distributing it across a complete speaker-like structure with all its components.
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 solution effectively minimizes the vibration and noise transmitted to the mounting structure, reducing undesired sounds like buzzes, squeaks, or rattles, while also reducing the size and cost by omitting the diaphragm and surround in the vibration reduction assembly.
Implementation Method 1
The voice coil generates a magnetic field when a voltage is applied to the voice coil, which repels or attracts the magnetic field of the magnet and therefore cases the voice coil to move axially
Implementation Method 2
The mass is sized to yield a first force that is equal in magnitude and opposite in direction relative to a second force generated by moving components in the speaker and acoustic pressure of the speaker
Data Source
AI summary
A vibration reduction assembly includes a mass and an actuator. The mass is configured to be attached to a rear plate or a frame of a speaker in a manner that allows the mass to move along a longitudinal axis of a pole of the rear plate. The mass is sized to yield a force that is equal in magnitude and opposite in direction relative to a force generated by moving components in the speaker and acoustic pressure of the speaker. In one example, the actuator is configured to move the mass in phase with movement of a voice coil of the speaker along the longitudinal axis of the pole and in an opposite direction than the voice coil movement. In another example, the actuator is configured to move the mass out of phase with the voice coil movement and in the same direction as the voice coil movement.