Speaker Coil Stabilizer for Microspeaker Stability
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Solution Overview
Problem
Microspeakers face a conflict between being compact and capable of producing a broad range of frequencies, with coils often being more prone to undesirable movement due to their length-width proportions, such as 3:1, which affects their stability.
Innovation Solution
A speaker design incorporating a permanent magnet and a coil stabilized by a stabilizer that contacts the coil's internal, external, or bottom surfaces, limiting movement along axes perpendicular to the coil's primary axis, ensuring the coil moves only along the desired axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coil length is increased to produce a broad frequency range, then the frequency range is improved, but the coil becomes more prone to undesirable movement due to length-width proportions
Solution Approach 1:
A stabilizer is introduced as an intermediary component between the coil and the magnetic field structure. The stabilizer contacts the coil at multiple points and provides mechanical support to prevent unwanted lateral movement while allowing axial movement, thus resolving the contradiction between coil length for frequency range and coil stability
2Volume of moving object
If the coil length-width proportion is increased to 3:1 or 2:1 for compactness, then the speaker compactness is improved, but the coil becomes more inclined to move in undesirable directions
Solution Approach 1:
The stabilizer acts as a mediator that provides mechanical support to the coil, preventing lateral displacement caused by the high length-width ratio. It allows the coil to maintain its compact proportions while compensating for the increased tendency toward unwanted movement through additional contact points and structural support
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 stabilizer effectively restricts unwanted movement of the coil, enhancing the speaker's frequency range and compactness while maintaining stability, thereby addressing the issue of coil instability in microspeakers.
Implementation Method 1
a voice coil, which may be positioned within a magnetic field defined by a permanent magnet and yoke or pot arrangement
Data Source
AI summary
A speaker and method for making the same are provided. The speaker includes a permanent magnet and a coil disposed about a first axis around the permanent magnet, the coil being configured to move along the first axis. The speaker further includes a membrane attached to a top surface of the coil and a stabilizer contacting at least one of an internal surface, an external surface, and a bottom surface of the coil, and configured to limit movement of the coil relative to a second axis perpendicular to the first axis.