Loudspeaker Basket Fixing Tab for Enclosure Vibration Control
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Solution Overview
Problem
Existing loudspeaker enclosures suffer from mechanical vibrations due to eigenmodes, leading to acoustic distortion and potential damage, especially when the loudspeaker is fixed to a non-deformable face of the shell, altering the dynamic behavior and eigenmodes of the enclosure.
Innovation Solution
A loudspeaker frame with a fixing tab extending from the front face to the rear, fixed to a second face of the sound box, transfers stiffness from the second face to the first face, limiting deformations during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the loudspeaker is fixed to a non-deformable face of the shell, then the acoustic performance is improved, but the eigenmodes of the enclosure are altered leading to significant displacement and vibration
Solution Approach 1:
The fixing tab extends from the first face (where the loudspeaker is mounted) to the second face (opposite face) of the sound box, creating a three-dimensional stiffening structure. This dimensional extension allows the tab to bridge across the enclosure volume, providing structural support that prevents eigenmode displacement without interfering with the loudspeaker mounting on the first face.
Solution Approach 2:
The stiffening function is segmented from the main shell structure and implemented as a separate fixing tab component. This tab can be independently designed, manufactured, and positioned to provide localized reinforcement at critical areas without requiring modification of the entire shell structure, thus maintaining enclosure eigenmodes while supporting the loudspeaker.
2Stability of the object's composition
If ribs are added to stiffen the faces of the shell, then the deformation is reduced, but the manufacturing complexity increases due to mould release direction constraints
Solution Approach 1:
Instead of adding ribs in the plane of the first face (which would conflict with mould release directions), the fixing tab extends in the third dimension from the first face to the second face. This out-of-plane configuration provides stiffening without interfering with the planar mould release requirements of the shell manufacturing process.
Solution Approach 2:
The fixing tab acts as an intermediary element that transfers mechanical loads between the loudspeaker mounting area and the opposite face of the enclosure. This mediator structure provides the necessary stiffening function without requiring direct modification of the shell faces, thus avoiding conflicts with manufacturing constraints.
3Device complexity
If the loudspeaker is mounted on the lid, then the assembly is simplified, but the lid becomes deformable under the mass of the magnet
Solution Approach 1:
The fixing tab merges the loudspeaker mounting function with the lid stiffening function into a single integrated structure. The tab is fixed to both the loudspeaker frame and the second face of the sound box, creating a combined assembly that simultaneously secures the loudspeaker and prevents lid deformation under magnet mass without requiring separate reinforcement components.
Data Source
AI summary
A frame of a loudspeaker is integrated into the sound box of a speaker enclosure and include a mobile assembly having a diaphragm. The frame includes a front face arranged to be positioned at a first face of the box and in which an opening is formed, defined by a periphery to which the diaphragm can be secured so that the diaphragm is in acoustic communication with the outside of the box via the opening. The frame further includes a fixing tab which extends from the front face of the frame towards the rear of the frame, and which is arranged to be fixed to a second face of the box.