Loudspeaker Module Steel Sheet Bonding Gap Prevention
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Solution Overview
Problem
The existing loudspeaker modules face issues with gaps forming between the steel sheet and the plastic housing during injection molding due to differing shrinkage rates, which affect audio performance and are typically addressed by costly and complex nano injection molding.
Innovation Solution
Incorporating a hot-melt bonding medium at the interface between the steel sheet and the module housing during injection molding, along with specific injection molding portions and structures, to enhance bonding strength and prevent gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel sheet is used to replace plastic material for space-saving and increased strength, then the strength and space efficiency are improved, but gaps form during injection molding due to different shrinkage rates
Solution Approach 1:
A hot-melt bonding medium is introduced as an intermediary substance between the steel sheet and the plastic housing. This bonding medium compensates for the shrinkage rate difference during cooling, preventing gap formation while maintaining strong adhesion. The bonding medium layer adapts to the dimensional changes of both materials, ensuring continuous contact and bond integrity.
Solution Approach 2:
The housing structure becomes a composite system consisting of plastic material, steel sheet, and hot-melt bonding medium. This multi-material composite approach allows each component to contribute its advantageous properties: the plastic provides formability, the steel provides strength, and the bonding medium provides gap prevention and adhesion.
2Manufacturing precision
If nano injection molding is used to prevent gaps, then the manufacturing precision is improved, but the processing complexity and cost increase
Solution Approach 1:
The hot-melt bonding medium serves as a simple intermediary that can be applied through conventional injection molding processes, avoiding the need for complex nano injection molding equipment. The bonding medium is introduced in a straightforward manner, making the process accessible to standard manufacturing facilities.
Solution Approach 2:
The hot-melt bonding medium is a cost-effective, consumable material that simplifies the overall manufacturing process. Rather than investing in expensive and complex nano injection molding equipment, the solution uses an inexpensive bonding medium that can be readily applied and provides effective gap prevention.
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 use of a hot-melt bonding medium improves the combination strength between the steel sheet and the module housing, preventing gaps and maintaining audio performance, thus offering a cost-effective solution to the shrinkage-related issues.
Implementation Method 1
a hot-melt bonding medium is provided at a position where the steel sheet and the module housing are combined
Data Source
AI summary
The present disclosure relates to a loudspeaker module and an electronic device. The loudspeaker module include a loudspeaker unit, a steel sheet and a module housing, wherein the loudspeaker unit is fixed in the module housing and divides an internal space of the module housing into a front chamber and a back chamber; the steel sheet is formed on the module housing by of injection molding; and a hot-melt bonding medium is provided at the position where the steel sheet and the module housing are combined. A technical problem to be solved by the present disclosure is to prevent a gap between a module housing and a steel sheet from occurring during injection molding with the combination strength between the steel sheet and the module housing also being improved, thereby preventing the audio performance of a loudspeaker module from being affected.