Electroacoustic Transducer Bobbin Flange for Precise Damper Molding
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Solution Overview
Problem
Conventional electroacoustic transducers, such as loudspeakers, have limitations in the connection and positioning of components like the damper, which affects the precision and efficiency of assembly.
Innovation Solution
The electroacoustic transducer design includes a cylindrical bobbin with a voice coil, a magnetic circuit, a diaphragm, a flange portion, and a damper connected to the magnetic circuit or frame, with the damper being formed by resin injection molding around the flange to ensure precise attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the damper is connected to the bobbin using conventional methods (separate components or integral molding), then the assembly process is simpler, but the positioning precision and attachment accuracy of the damper deteriorates
Solution Approach 1:
The flange portion is integrated with the bobbin as a single structural unit, eliminating the need for separate connection components. This merging of components ensures precise positioning of the damper while simplifying the overall assembly process, as the flange serves both as a structural element and as the attachment interface for the damper.
Solution Approach 2:
The flange portion is pre-formed as an integral part of the bobbin structure before the damper attachment process. This preliminary formation of the attachment interface ensures that the damper can be positioned with high precision during assembly, without requiring additional positioning adjustments or complex alignment procedures.
2Productivity
If manual assembly methods are used for connecting the damper, then flexibility in assembly is maintained, but production efficiency and productivity deteriorates
Solution Approach 1:
The flange portion integrates multiple functions into a single component: structural support for the bobbin, positioning reference for the damper, and attachment interface. This consolidation enables automated assembly processes to efficiently connect the damper without requiring complex manual operations, thereby improving productivity while maintaining operational simplicity.
3Manufacturing precision
If the damper is connected using conventional connection methods, then the structure is simpler, but dimensional accuracy and attachment precision deteriorates
Solution Approach 1:
The flange portion is merged with the bobbin to form an integral structure, eliminating gaps and interfaces that would compromise dimensional accuracy. This unified structure ensures precise dimensional control while the simplified connection design (flange to damper) reduces overall structural complexity compared to multi-component connection systems.
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 design allows for improved precision in damper attachment and enhanced production efficiency, reducing manual labor and ensuring minimal dimensional errors.
Implementation Method 1
forming the damper by filling, with resin, a space between a first mold component and a second mold component that are disposed sandwiching an entire circumference of the flange in a winding axis direction of the voice coil
Data Source
AI summary
An electroacoustic transducer includes: a bobbin that is cylindrical; a voice coil that is wound around one end portion of the bobbin; a magnetic circuit that includes a tubular magnetic gap in which the voice coil is disposed; a frame to which the magnetic circuit is attached; a diaphragm that is connected to the bobbin and the frame; a flange portion that protrudes outward from an outer circumferential surface of the bobbin, between the voice coil and the diaphragm; and a damper that is connected to an outer circumferential surface of the flange portion and to the magnetic circuit or the frame.