Low-Profile Loudspeaker With Nested Spider for High Excursion
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Solution Overview
Problem
Existing loudspeakers face challenges in achieving reduced mounting depth while maintaining high excursion, motor strength, power handling, and efficiency, often resulting in heat buildup, mechanical instability, and reduced reliability.
Innovation Solution
A loudspeaker design with a centrally disposed spider and force transfer assembly that allows for high excursion with reduced mounting depth, incorporating a spider mounted within the yoke's central opening, connected to a diaphragm support structure, and a voice coil positioned in multiple air gap sections, enabling sufficient electromotive force and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the mechanical excursion range is reduced to decrease mounting depth, then the overall depth is reduced, but the ability to reproduce low frequencies with high output deteriorates
Solution Approach 1:
The patent repositions the spider from the traditional external location to the central opening of the yoke, utilizing the internal space along the central axis. This dimensional reconfiguration allows the voice coil to achieve greater axial excursion within the same mounting depth, effectively using the third dimension (depth along the central axis) to resolve the contradiction between limited mounting depth and required excursion range for low frequency reproduction
2Length of stationary object
If the magnetic motor structure size is reduced for reduced depth, then the mounting depth is decreased, but the electromotive force and excursion capability deteriorate
Solution Approach 1:
The patent nests the spider within the central opening of the yoke structure, and positions the voice coil to operate within the air gap defined by the magnet and yoke. This nested configuration allows the magnetic motor structure to maintain sufficient size for generating adequate electromotive force while fitting within a reduced mounting depth envelope, as the components are efficiently arranged in concentric layers along the central axis
3Length of stationary object
If the diaphragm height is shortened to minimize depth, then the mounting depth is reduced, but the structural strength deteriorates requiring reinforcement that adds mass
Solution Approach 1:
The patent compensates for the shortened diaphragm height by increasing the excursion capability in the axial dimension. The repositioned spider and optimized air gap configuration allow the voice coil to achieve greater linear travel along the central axis, maintaining the mechanical clearance necessary for high excursion without requiring a taller diaphragm structure, thereby avoiding the need for additional reinforcing mass
4Length of stationary object
If the spider is repositioned to reduce depth, then the mounting depth is decreased, but the mechanical stability and operational reliability deteriorate
Solution Approach 1:
The patent nests the spider within the central opening of the yoke, where it is securely positioned and supported by the yoke structure. This nested configuration provides stable mechanical support and proper alignment for the voice coil, maintaining operational reliability. The spider's repositioning to the central opening allows it to effectively center the voice coil while providing stable mechanical clearance, ensuring consistent operation without compromising reliability
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 achieves stable mechanical clearance, high excursion, and efficient power handling with reduced depth, preventing damage and maintaining reliability in smaller enclosures.
Implementation Method 1
a voice coil winding on a bobbin suspended within the air gap of the magnet assembly
Implementation Method 2
a spider mounted within in the central opening of the yoke of a magnetic motor structure which is connected by a coupling to a diaphragm support structure that transfers force from a voice coil winding
Data Source
AI summary
A low-profile loudspeaker has a speaker motor assembly with a yoke including a central column. One or more magnets are radially disposed around the central column. A top plate is mounted in an axially centered relation to an arrangement of the one or more magnets and the central column. Inner circumferences of the top plate and the one or more magnets and an outer circumference of the central column of the yok define an air gap. One or more axial spiders are mounted to an interior of the central column, with a circumference of the air gap being larger than an outer circumference of the one or more axial spiders.