Loudspeaker Assembly Structure for Voice Coil Concentricity
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Solution Overview
Problem
Existing loudspeaker assembly processes face challenges in maintaining concentricity and stability due to the magnetic yoke blocking the voice coil and diaphragm, leading to difficulties in gluing and requiring increased magnetic gaps that affect performance.
Innovation Solution
A loudspeaker design with notches on the magnetic yoke and frame for precise positioning of components, allowing for injection molding and ensuring concentricity through a consistent assembly sequence, reducing magnetic gaps and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the magnetic yoke is arranged to combine with the frame through injection molding, then the structural integration is improved, but the magnetic yoke blocks the voice coil and diaphragm, making assembly difficult and affecting concentricity
Solution Approach 1:
The magnetic yoke is segmented into a flat board part and a folded part that can be separately positioned. The folded part is bent and extended from both sides of the flat board part, creating a modular structure that allows the voice coil and diaphragm to be assembled in sequence without being blocked by the entire magnetic yoke structure.
Solution Approach 2:
A circuit board is introduced as an intermediary component arranged between the diaphragm and the voice coil. The circuit board includes a connection arm that extends through the magnetic gap, providing a mounting surface for the voice coil and diaphragm while maintaining their relative positions and ensuring concentricity.
2Ease of manufacture
If the magnetic gap range is increased to facilitate assembly, then assembly ease is improved, but the loudspeaker performance is degraded
Solution Approach 1:
The magnetic yoke has different structural characteristics in different regions. The folded part creates localized magnetic gaps with precise dimensions, while the flat board part provides overall structural support. This allows the magnetic gap to be precisely controlled where needed for voice coil insertion while maintaining structural integrity.
Solution Approach 2:
The magnetic gap dimensions are precisely controlled by changing the geometric parameters of the folded part of the magnetic yoke. By adjusting the bend radius and extension length of the folded part, the magnetic gap can be optimized for both assembly ease and performance without requiring an increased overall gap range.
3Adaptability or versatility
If different fixtures are used for positioning the voice coil and frame, then assembly flexibility is improved, but maintaining concentricity becomes difficult
Solution Approach 1:
The circuit board serves multiple functions: it provides electrical connections, structural support, and positioning references. The connection arm extending through the magnetic gap acts as a universal positioning element that ensures concentricity between the voice coil, diaphragm, and frame while allowing assembly flexibility.
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 design ensures reliable bonding and concentricity of components, improving assembly efficiency and performance by reducing magnetic gaps and maintaining structural integrity.
Implementation Method 1
The magnetic circuit system drives the vibration system to vibrate and produce sound. The vibration system includes a diaphragm fixed on the frame, and a voice coil inserted in the magnetic gap.
Data Source
AI summary
The present disclosure provides a loudspeaker including a frame, a first diaphragm, a first voice coil and a magnetic circuit system, and a first circuit board arranged between the first diaphragm and the first voice coil. The magnetic circuit system includes a magnetic yoke and a first magnet. Compared with the related technology, the loudspeaker of the present disclosure guarantees the concentricity of the frame and the first voice coil, and guarantees the reliability of the bonding between the first circuit board and the first diaphragm.