Speaker Box Mesh Support Structure for Drop Reliability
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Solution Overview
Problem
Existing speaker boxes in portable mobile terminals suffer from reduced fixation strength and drop reliability due to the use of a mesh that is not supportive of the speaker unit, leading to potential deformation and resonance issues, especially with large-sized units.
Innovation Solution
A speaker box design featuring a mesh fixed to a protrusion on a steel sheet with a damping member sandwiched between the mesh and the yoke, maintaining a specific distance and thickness to stabilize the speaker unit, and using a sealing member to cover a filling hole, enhancing fixation strength and drop reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the mesh is spaced apart from the speaker unit to avoid resonance, then acoustic performance is improved, but fixation strength between the speaker unit and housing is reduced
Solution Approach 1:
A damping member is introduced as an intermediary component between the mesh and the speaker unit. This damping member serves dual functions: it prevents direct contact between the mesh and speaker unit to avoid resonance, while simultaneously providing sufficient mechanical support and fixation strength through its damping properties and structural design
Solution Approach 2:
The damping member is made of foam material that combines acoustic damping properties with mechanical support capabilities. This composite material solution allows the mesh to be spaced from the speaker unit for acoustic performance while the foam provides the necessary fixation strength
2Strength
If damping foam is provided between the mesh and speaker unit to improve fixation, then fixation strength is improved, but deformation of the mesh occurs
Solution Approach 1:
The damping member is designed with specific local properties: it has sufficient thickness and elasticity in the contact regions to provide fixation strength, while maintaining appropriate compliance to avoid excessive deformation of the mesh. The damping member's material properties are locally optimized to balance support and deformation prevention
3Strength
If the mesh is fixed directly to the speaker unit to improve fixation strength, then fixation strength is improved, but resonance between the speaker unit and sound-absorbing particles occurs
Solution Approach 1:
The damping member serves as a mediator that decouples the mesh from direct contact with the speaker unit. This intermediary layer eliminates the resonance pathway while maintaining the necessary mechanical connection for fixation strength
Solution Approach 2:
The harmful direct contact between the mesh and speaker unit is extracted/removed from the system. By taking out the direct mechanical connection and replacing it with a damping member, the resonance issue is eliminated while preserving fixation functionality
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 improves fixation strength and drop reliability by stabilizing the speaker unit within the housing, preventing resonance and deformation, thereby ensuring stable acoustic performance.
Implementation Method 1
a damping member sandwiched between the mesh and the yoke
Implementation Method 2
the mesh is glued to a top wall and fixed using hot-melt adhesive
Data Source
AI summary
The present disclosure discloses a speaker box including a housing having a receiving space and a speaker unit received in the receiving space. The housing and the speaker unit encloses a front cavity and a rear cavity isolated from each other. A mesh disposed in the rear cavity is configured to enclose a filling chamber with the bottom cover for filling sound-absorbing particles. A steel sheet of the bottom cover includes a protrusion connected to the mesh. And, a damping member opposite to the protrusion is sandwiched between the mesh and the yoke; the speaker box in the present disclosure has higher drop reliability.