Collapsible Loudspeaker Mounting to Contain Magnet Ejection
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Solution Overview
Problem
Conventional loudspeakers in vehicles can project the magnet assembly as a projectile during impacts, posing a safety hazard to passengers due to the lack of rigid attachment between the magnet assembly and the enclosure.
Innovation Solution
A mechanical coupling is established between the magnet assembly and the enclosure, either directly through connectors or indirectly via a flange, to ensure the magnet assembly remains attached to the enclosure during impacts, allowing the loudspeaker system to collapse within the enclosure's failure load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnet assembly is rigidly attached to the enclosure, then safety during impact is improved, but audio performance may deteriorate due to reduced rigidity
Solution Approach 1:
The loudspeaker system is divided into two distinct attachment mechanisms: a rigid attachment between the magnet assembly and enclosure for safety, and a collapsible basket for audio performance. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different parts of the loudspeaker system have different rigidity requirements. The magnet assembly attachment is made rigid for safety, while the basket is made collapsible for audio performance. This local differentiation of mechanical properties resolves the contradiction between safety and audio quality.
2Reliability
If a collapsible basket is used, then safety during impact is improved, but manufacturing complexity increases
Solution Approach 1:
The basket is designed with collapsible members that can dynamically change their structural state - rigid during normal operation for audio performance, and collapsible during impact for safety. This dynamic behavior reduces the need for complex permanent safety mechanisms.
Solution Approach 2:
The mechanical properties of the basket members are designed to change under different load conditions. The collapsible members maintain rigidity under normal operating loads but collapse under impact loads, providing safety without requiring complex additional components.
3Strength
If the basket is made highly rigid, then audio performance is improved, but safety during impact deteriorates as the loudspeaker projects outward
Solution Approach 1:
The loudspeaker system separates the audio performance function (rigid basket) from the safety function (collapsible basket members). This segmentation allows the basket to provide rigidity for audio quality while having built-in collapse paths for safety during impact.
Solution Approach 2:
The potential harm of a rigid basket becoming a projectile during impact is converted into a benefit by designing collapsible members that intentionally fail in a controlled manner. The rigidity needed for audio performance is maintained during operation, while the collapse mechanism provides safety during impact events.
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 configuration prevents the magnet assembly from being projected out during sudden impacts, enhancing safety while maintaining sufficient rigidity for audio performance.
Implementation Method 1
a magnet and voice coil assembly, which is operable to convert electrical energy to axial displacement to provide said driving of the diaphragm
Implementation Method 2
The magnet assembly and a back face and/or side face of the enclosure are adapted for being mechanically coupled to each other, so as to provide a rigid attachment between the magnet assembly and the enclosure
Data Source
Figure 1~2B
Figure 3~4C
Figure 5~6
AI summary
A loudspeaker system comprising: a loudspeaker assembly including a diaphragm, a magnet assembly, and a voice coil assembly, wherein the magnet assembly and voice coil assembly are driveably coupled to the diaphragm to displace the diaphragm to transmit pressure waves as audible sound, an enclosure arranged to enclose the loudspeaker assembly and including a back face and a front face, wherein said back face extends over the magnet assembly, and the magnet assembly is mechanically coupled to the back face and/or side face of the enclosure and the diaphragm is coupled to a front face of the enclosure, wherein the magnet assembly and diaphragm are directly connected to each other by a collapsible basket or said loud speaker assembly does not comprise a basket coupling the magnet assembly and diaphragm.