Loudspeaker Assembly Jig for Magnetic Circuit Alignment
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Solution Overview
Problem
Conventional loudspeaker manufacturing methods often result in gap defects due to dimensional tolerances and uneven adhesive application, leading to misalignment and increased contact between the voice coil and magnetic gap, especially in downsized designs with higher maximum input power.
Innovation Solution
A manufacturing method that ensures parallelism and perpendicularity between the plate, yoke, and frame components using a jig to accurately assemble the magnetic circuit and frame, preventing obliquity and displacement, thereby reducing gap defects and enhancing assembly accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional assembly methods are used without a jig, then assembly process is simpler and faster, but parallelism and perpendicularity between components cannot be ensured, leading to gap defects
Solution Approach 1:
A jig is introduced as an intermediary tool during the assembly process to ensure accurate parallelism and perpendicularity between the plate, yoke, and frame. The jig acts as a temporary mediator that guides component alignment and is removed after assembly, resolving the contradiction by adding controlled complexity only where needed for precision.
Solution Approach 2:
The jig is used to pre-establish the correct geometric relationships (parallelism and perpendicularity) between components before final assembly. By performing the alignment action in advance during the assembly process, the method ensures manufacturing precision without requiring complex post-assembly adjustments.
2Power
If loudspeaker is downsized with larger voice coil amplitude, then maximum input power increases, but gap defects become more noticeable due to increased voice coil contact with magnetic gap
Solution Approach 1:
The method applies preliminary anti-action by ensuring precise parallelism and perpendicularity through the jig during assembly, which prevents the occurrence of gap defects before they can happen during operation. This proactive alignment compensation counteracts the increased risk of gap defects that arises from larger voice coil amplitudes in downsized, high-power loudspeakers.
3Reliability
If adhesive thickness is increased to ensure attachment, then attachment reliability improves, but obliquity and displacement increase due to uneven adhesive distribution
Solution Approach 1:
The jig serves as a mediator that establishes precise geometric relationships between components independent of adhesive thickness variations. By providing mechanical guidance and alignment constraints during assembly, the jig ensures that even with uneven adhesive distribution, the final alignment accuracy and parallelism are maintained, resolving the contradiction between attachment reliability and manufacturing precision.
Data Source
AI summary
Provided is a method of manufacturing a loudspeaker including assembling a magnetic circuit and a frame. In the step of assembling the magnetic circuit and the frame, parallelism between a plate and a damper attachment portion of the frame is ensured by bringing an upper portion of the plate and the damper attachment portion of the frame into contact with a jig. In addition, perpendicularity between a magnetic gap and the damper attachment portion of the frame is ensured by bringing an outer circumferential side portion of the plate of the magnetic gap and an inner circumferential side portion of the yoke into contact with the jig. The magnetic circuit and the frame are assembled in such a state. With such a manufacturing method, it is possible to achieve a superior loudspeaker capable of reducing a gap defect while being downsized and having increased maximum input power.