Thin Speaker Damper Design for Amplitude Symmetry
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Solution Overview
Problem
Current thin speakers for next-generation automatic collision notification systems face challenges in achieving high symmetry in amplitude, reducing distortion, and minimizing the lowest resonance frequency, while maintaining a small size and high rigidity to prevent voice coil abutment issues.
Innovation Solution
A thin speaker design featuring a diaphragm with a bow-shaped inner circumference damper that includes a bend and wave sections, providing increased rigidity and softness, and a magnetic circuit configuration that reduces the abutting of the voice coil bobbin and damper on the yoke, ensuring symmetric amplitude and improved acoustic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the speaker is made thin to reduce size, then the thickness is reduced, but the rigidity decreases causing voice coil abutment issues
Solution Approach 1:
The patent employs a thin frame structure with optimized cross-sectional geometry that provides high rigidity despite reduced thickness. The frame includes a magnetic circuit portion, a coil portion, and a diaphragm portion with specific thickness variations that maintain structural integrity while achieving the required thin profile for ACN systems.
Solution Approach 2:
The patent optimizes the thickness parameters of different portions of the frame structure. The magnetic circuit portion has a first thickness, the coil portion has a second thickness greater than the first, and the diaphragm portion has a third thickness greater than the first. This differential thickness design maintains rigidity where needed while achieving overall thinness.
2Strength
If the damper is made softer to reduce resonance frequency, then the lowest resonance frequency is reduced, but the rigidity decreases causing excessive vibration
Solution Approach 1:
The damper is designed with non-uniform properties along its height. The upper portion has different characteristics than the lower portion, allowing the upper part to provide softness for reduced resonance frequency while the lower part maintains rigidity to prevent excessive vibration and maintain structural stability.
3Manufacturing precision
If the amplitude symmetry is improved to reduce distortion, then the distortion is reduced, but the structural complexity increases
Solution Approach 1:
The frame structure intentionally employs asymmetric design in specific regions to achieve symmetric amplitude characteristics. The magnetic circuit portion, coil portion, and diaphragm portion have different thicknesses and geometries that compensate for nonlinearities and achieve highly symmetric amplitude response, reducing distortion without requiring excessive structural complexity.
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 design enhances the speaker's rigidity and flexibility, reducing distortion and the lowest resonance frequency, while maintaining a compact size, thus improving the overall acoustic performance and preventing abnormal sounds during high input levels.
Implementation Method 1
a magnetic gap including the voice coil, the voice coil bobbin to which an inner circumference of a damper is attached
Data Source
AI summary
A damper has an inner circumference including a curve descending in a bow shape. A wave section extends from the outer circumferential end of the curve to the outer circumference of the damper. The inner circumference of the damper is shorter than the wave section.