Loudspeaker Field Replaceable Moving Assembly
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Solution Overview
Problem
Traditional loudspeakers face issues with tolerance stack-up and alignment problems during assembly, leading to performance degradation and complex, time-consuming repairs due to permanently attached components and the need for specialized tools and knowledge.
Innovation Solution
The loudspeaker design allows for precise alignment between the frame and motor structure using a centering fixture and employs a moving assembly unit that can be easily replaced in the field, minimizing tolerance stack-up and eliminating the need for specialized tools or knowledge, with the moving assembly comprising the voice coil, upper and lower suspensions, and diaphragm formed outside the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional assembly methods with permanent fasteners and in-frame assembly are used, then manufacturing complexity is reduced, but alignment precision and tolerance stack-up worsen significantly
Solution Approach 1:
The patent applies preliminary action by pre-assembling the moving assembly (voice coil, suspensions, diaphragm) outside the frame on a separate fixture before final installation. This allows precise alignment and tolerance control to be established beforehand, preventing cumulative tolerance stack-up that would occur with sequential in-frame assembly. The pre-assembled unit is then installed as a complete module into the frame.
Solution Approach 2:
The patent uses an intermediary assembly fixture that serves as a temporary holding and alignment structure for the moving assembly components during pre-assembly. This fixture enables precise positioning and concentric alignment of the voice coil, suspensions, and diaphragm before the assembly is transferred to the final speaker frame, acting as a mediator that facilitates high-precision assembly without requiring complex in-frame alignment procedures.
2Stability of the object's composition
If components are permanently attached with glue, then structural stability improves, but ease of repair deteriorates due to need for specialized tools and knowledge
Solution Approach 1:
The patent applies segmentation by dividing the loudspeaker into distinct modular components: a stationary frame assembly and a separate moving assembly (voice coil, suspensions, diaphragm). The moving assembly is designed as a self-contained module that can be independently removed and replaced without affecting the frame or requiring glue removal. This modular segmentation maintains structural stability while enabling simple field repairs by unskilled workers.
Solution Approach 2:
The patent applies dynamics by designing the moving assembly with movable and detachable connections to the frame, allowing the assembly to be dynamically removed and reinstalled. Instead of permanent fixed connections, the design enables the moving assembly to be detached for repair or replacement and reattached, providing flexibility for maintenance while maintaining operational stability during use.
3Reliability
If tolerance stack-up is allowed to accumulate from voice coil to upper suspension, then ease of manufacture improves, but reliability deteriorates due to suspension deformation and voice coil rocking
Solution Approach 1:
The patent applies preliminary action by pre-assembling the moving assembly components (voice coil, lower suspension, upper suspension, diaphragm) on a dedicated fixture before final installation into the frame. This pre-assembly process establishes precise concentric alignment and minimizes tolerance stack-up among components. The pre-assembled unit is then installed as a complete module, preventing the accumulation of alignment errors that would occur with sequential in-frame assembly.
Solution Approach 2:
The patent replaces the traditional mechanical in-frame assembly process with a pre-assembly fixture system. Instead of assembling components sequentially within the frame constraints, the moving assembly is constructed on a separate dedicated fixture that provides precise positioning and alignment features. This substitution of the assembly system eliminates the frame's dimensional constraints from the tolerance chain and enables tighter alignment control.
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 simplifies repairs and replacements, reduces deformation of the upper suspension, and ensures precise alignment, enhancing the loudspeaker's performance and making field repairs feasible by unskilled workers without specialized equipment.
Implementation Method 1
precise alignment between the frame and motor structure using a centering fixture
Implementation Method 2
electrical energy is supplied to the voice coil causing it to axially move within the magnetic gap
Implementation Method 3
The free ends of the diaphragm and lower suspension are mounted to the outer surface of the former of the voice coil and support it for axial movement within the magnetic gap
Data Source
AI summary
A loudspeaker and method of assembly according to this invention provides for precise alignment between the frame and motor structure before they are connected to one another, and employs a fixture to form the moving assembly of the speaker, i.e. the voice coil, upper and lower suspensions and diaphragm, outside of the frame so that concentric tolerance stack-up is minimized. The moving assembly, once formed, is mounted as a unit to the frame and motor structure to facilitate assembly and repair of the speaker.