High Aspect Ratio Microspeaker Dual Plane Suspension
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Solution Overview
Problem
High aspect ratio microspeakers face stability issues due to their elongated shape, which can lead to rocking modes that decrease sound pressure output and affect audio performance in compact consumer electronics devices.
Innovation Solution
A dual suspension system is implemented, with a primary suspension member attached around the diaphragm and a secondary suspension member attached to the width sides of the voice coil, providing stability by suppressing rocking modes without interfering with the diaphragm's vibrational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single plane suspension system is used in high aspect ratio microspeakers, then the device can be miniaturized to fit compact consumer electronics, but the diaphragm stability deteriorates due to increased rocking modes
Solution Approach 1:
The patent introduces a second suspension plane perpendicular to the first suspension plane, transforming the single-plane suspension system into a two-plane suspension system. This dimensional addition provides stability in the rocking mode direction without increasing the footprint area, allowing the microspeaker to maintain compact size while improving diaphragm stability.
2Productivity
If the diaphragm aspect ratio is increased to improve sound pressure output, then the audio performance is improved, but the rocking mode severity increases reducing stability
Solution Approach 1:
By adding suspension elements in a second plane perpendicular to the first suspension plane, the patent stabilizes the diaphragm against rocking modes. This allows the use of higher aspect ratio diaphragms for improved sound pressure output without suffering from excessive rocking instability.
Solution Approach 2:
The patent modifies the suspension system configuration by changing the arrangement and orientation of suspension elements, specifically adding a second plane of suspension. This parameter change in the suspension architecture enables the diaphragm to maintain stability at higher aspect ratios, thereby achieving improved sound pressure output.
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 dual suspension system enhances the stability of high aspect ratio microspeakers, increasing the frequency at which rocking modes occur above the working range, thereby improving sound pressure output and overall audio performance in compact devices.
Implementation Method 1
A voice coil, having an upper end and a lower end, may be attached to a bottom face of the diaphragm at its upper end. The transducer may further include a magnet assembly. The magnet assembly may include a magnet and a yoke.
Implementation Method 2
An upper suspension member and a lower suspension member. The upper suspension member may connect the sound radiating surface to the frame and be above the voice coil. The lower suspension member may connect the voice coil to the frame.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~6
AI summary
A microspeaker includes a frame and a diaphragm having length sides that are longer than its width sides. A magnet is positioned below the diaphragm. A yoke includes a base portion positioned below the magnet and sidewalls which extend from the base portion, the yoke sidewalls positioned only along a length dimension of the magnet. A voice coil includes an upper end attached to a bottom face of the diaphragm and a lower end positioned within a gap formed between the length dimension of the magnet and the yoke sidewalls. A first suspension member is attached to the length sides and the width sides of the diaphragm and the frame. The first suspension member is within a first plane. A second suspension member is attached to the lower end of the voice coil and the frame. The second suspension member is in a second plane different from the first plane.