Loudspeaker Rear Cavity Zeolite Particle Filling
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Solution Overview
Problem
Conventional loudspeaker modules have limited space in the rear acoustic cavity, restricting the filling of sound absorption elements like zeolite particles, which affects their sound absorption performance due to poor packaging and gas permeability.
Innovation Solution
Incorporating a net-like isolating component within the rear acoustic cavity to create a filled region for sound absorbing particles, made of non-foaming materials like natural zeolite powder, allowing them to fully occupy the space and improve gas permeability, thereby enhancing acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound absorbing particles are packaged with screen mesh cloth into a packaging bag, then the particles are contained and isolated, but the overall gas permeability is poor and the packaging bag cannot fill the whole rear acoustic cavity
Solution Approach 1:
The patent removes the packaging bag and screen mesh cloth from the sound absorption structure. The sound absorbing particles are directly placed in the rear acoustic cavity without any packaging, eliminating the packaging bag's negative effects on gas permeability and space utilization while maintaining particle containment through the net-like isolating component
Solution Approach 2:
The patent uses a net-like isolating component with porous structure instead of a sealed packaging bag. This net-like structure provides adequate gas permeability for the sound absorbing particles to function effectively while still isolating them from the loudspeaker unit, resolving the contradiction between containment and gas permeability
2Reliability
If the rear acoustic cavity is filled as much as possible with sound absorption element, then the low frequency performance is improved, but the limited space and packaging constraints prevent sufficient filling
Solution Approach 1:
By removing the packaging bag constraint, the sound absorbing particles can be directly filled into the rear acoustic cavity, maximizing the filling volume and improving low frequency performance without being limited by the packaging bag's shape and size
Solution Approach 2:
The patent changes the physical state of the sound absorption element from packaged form to loose particle form, allowing the particles to flow and fill the rear acoustic cavity more completely, thereby increasing the effective filling volume and improving acoustic performance
3Reliability
If packaging bag is used to contain sound absorbing particles, then the particles are isolated from loudspeaker unit, but the gas permeability is poor affecting sound absorption performance
Solution Approach 1:
The patent replaces the sealed packaging bag with a net-like isolating component that has porous structure. This allows gas to permeate through the isolating component while still containing the sound absorbing particles and isolating them from the loudspeaker unit, eliminating the harmful effect of poor gas permeability
Solution Approach 2:
The net-like isolating component serves as an intermediary structure between the sound absorbing particles and the loudspeaker unit. It provides isolation functionality while maintaining gas permeability, resolving the contradiction between particle containment and gas flow requirements
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 solution enables the sound absorbing particles to fully fill the rear acoustic cavity, improving low-frequency performance and overall acoustic quality while reducing production costs and complexity.
Implementation Method 1
the sound absorption element can effectively reduce the F0 (low frequency) of the module, and makes the medium frequency curve smoother
Implementation Method 2
the sound absorbing particles are made of a non-foaming material, and the external diameter of the sound absorbing particles is ≥0.01 mm
Data Source
AI summary
A loudspeaker module, comprising a housing, the housing accommodates a loudspeaker unit, and the loudspeaker unit divides the overall module inner cavity into a front acoustic cavity and a rear acoustic cavity, the rear acoustic cavity is provided with sound absorbing particles therein, the rear acoustic cavity is further provided with therein a net-like isolating component for isolating the sound absorbing particles and the loudspeaker unit, the isolating component divides the whole rear acoustic cavity into a filled region and an non-filled region, the sound absorbing particles are located within the filled region, the sound absorbing particles are made of a non-foaming material, and the external diameter of the sound absorbing particles is ≥0.01 mm and less than the height of the filled region.