Unitized Speaker Housing via Two-Shot Injection Molding
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Solution Overview
Problem
Conventional portable wireless speakers face challenges in maintaining acoustic efficiency and reliability due to smaller enclosures, which result in reduced bass response, higher failure rates, and wider component tolerances, while also being costly and labor-intensive to manufacture.
Innovation Solution
A portable speaker apparatus with a continuous unitized body formed by injection molding, where the speaker housing and flexible surround form a single unit, using materials like polycarbonate and liquid silicone rubber, eliminating the need for separate components and fastening mechanisms, thereby reducing failure points and improving acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker enclosure is made smaller to improve portability, then compactness is improved, but acoustic efficiency and bass response deteriorate
Solution Approach 1:
The patent merges the speaker housing and passive radiator into a single continuous unitized body formed by injection molding. This integration eliminates separate components and interfaces, allowing the passive radiator to be seamlessly incorporated into the housing structure. The merged design maximizes the use of available internal volume for acoustic purposes while maintaining a compact external form factor, thus improving acoustic efficiency without sacrificing portability.
2Ease of manufacture
If multiple separate components are used to form the speaker housing and passive radiator, then manufacturing flexibility is improved, but assembly complexity and failure points increase
Solution Approach 1:
The speaker housing and passive radiator are combined into a single integrated component manufactured through injection molding. This merging eliminates the need for separate manufacturing processes, assembly steps, fasteners, and sealing interfaces. The single-component design reduces assembly complexity to zero while maintaining manufacturing flexibility through the versatility of injection molding technology, which can produce complex geometries in one step.
Solution Approach 2:
The injection molding process itself provides segmentation through multi-cavity or stacked mold designs, allowing multiple speaker units to be produced simultaneously or in sequence. This maintains manufacturing flexibility and scalability while still producing integrated single-piece speaker housings, balancing production efficiency with design integration.
3Ease of operation
If conventional separate component assembly is used, then ease of assembly is improved, but reliability and seal integrity deteriorate
Solution Approach 1:
By merging the housing and passive radiator into a single molded piece, the patent eliminates all assembly operations and interfaces. The continuous material structure ensures perfect seal integrity without requiring gaskets, adhesives, or mechanical fasteners that could fail. The integrated design makes assembly trivial (simplifying to a single injection molding operation) while simultaneously maximizing reliability through the absence of potential failure points.
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 solution enhances acoustic efficiency, reduces manufacturing costs and labor, and improves reliability by integrating the speaker housing and passive radiator into a single, robust unit, minimizing acoustic and water leakage, and increasing thermal resistance.
Implementation Method 1
The continuous unitized body can be injection molded. In some cases, the injection molding can be a multi-shot process, where a first shot of the multi-shot process forms the speaker housing, and where a second shot of the multi-shot process forms the flexible surround and over-molds the diaphragm
Data Source
AI summary
Certain embodiments include an injection-molded portable speaker apparatus including a portable speaker housing with an opening formed on the surface, a flexible inverted speaker surround including an inner perimeter and an outer perimeter, where the outer perimeter is coupled to an outer edge of the opening of the housing, and a diaphragm coupled to the inner perimeter of the flexible surround such that the diaphragm is suspended within the opening of the housing, where the flexible surround and diaphragm form a speaker passive, and where the speaker housing and the flexible surround form a continuous unitized body. The injection molding process for the continuous unitized body can be a two-shot process, where the first shot forms the speaker housing, and the second shot forms the flexible surround, which may further over-mold the diaphragm, such that the diaphragm is part of the continuous unitized body.