Speaker Magnetic Circuit Holder with Elastic Pressing Arms
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Solution Overview
Problem
Existing speakers face challenges in stably holding the magnetic circuit due to dimensional tolerances, leading to potential deformation or displacement of the frame and magnetic circuit, which affects vibration characteristics and stability.
Innovation Solution
A speaker design featuring a magnetic circuit holder with elastically deformable pressing arms that contact the magnetic circuit's restriction surface, allowing for stable holding and distributing stress even with a step between mounting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner periphery of the bottom portion presses the front end surface of the yoke to restrict movement, then the magnetic circuit is held stably in the thrust direction, but a step between mounting surfaces causes gap formation and frame deformation
Solution Approach 1:
The bottom portion is segmented into a pressing portion (with pressing arms) and a mounting portion, allowing independent functions of pressing and mounting. This segmentation enables the pressing arms to compensate for dimensional tolerances while the mounting portion provides stable screw fixation, resolving the contradiction between stable magnetic circuit holding and frame deformation prevention.
Solution Approach 2:
The pressing arms are designed with elastic deformability, changing their mechanical parameter from rigid to flexible. This allows the pressing arms to deform elastically and absorb dimensional tolerance variations, maintaining stable contact with the magnetic circuit front end surface without transmitting excessive stress to the frame, thus preventing frame deformation while ensuring stable magnetic circuit holding.
2Strength
If mounting screws are used to fix the bottom chamber to the frame, then the frame and bottom chamber are connected, but the tightening force deforms or breaks the frame
Solution Approach 1:
The bottom portion is divided into pressing and mounting portions positioned at different locations. The mounting portion receives screws for secure fixation between the frame and bottom chamber, while the pressing portion (with pressing arms) handles the magnetic circuit contact. This spatial segmentation allows the mounting screws to provide strong connection without concentrating stress on the frame's critical structural areas, preventing frame deformation or breakage.
3Ease of manufacture
If dimensional tolerances of bottom chamber and frame are not controlled tightly, then manufacturing cost is reduced, but alignment between front end surfaces becomes difficult
Solution Approach 1:
The pressing arms act as an intermediary element between the bottom chamber's mounting surface and the magnetic circuit's front end surface. They provide a compliant interface that compensates for misalignment caused by relaxed dimensional tolerances in the bottom chamber and frame. The elastic deformability of the pressing arms allows them to adapt to surface irregularities and maintain proper contact, achieving functional alignment precision without requiring tight manufacturing tolerances.
4Reliability
If the front end surface of the bottom chamber is positioned rearward from the front end surface of the yoke, then the magnetic circuit is held, but a gap occurs between the bottom portion and bottom chamber preventing stable connection
Solution Approach 1:
The pressing arms are designed to be elastically deformable, introducing dynamic compliance to the system. When the bottom chamber is positioned with its front end surface rearward from the yoke's front end surface, the pressing arms can still make contact with the magnetic circuit and apply restraining force. The elastic deformation of the pressing arms compensates for the positional offset, maintaining both magnetic circuit restriction and enabling stable screw connection between the frame and bottom chamber.
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 stable retention of the magnetic circuit, preventing frame deformation and maintaining vibration characteristics by distributing stress through elastically deformable pressing arms, reducing the likelihood of frame bending or breaking.
Implementation Method 1
at least one pressing arm 42 is formed so as to be elastically deformable
Implementation Method 2
The magnet of the magnetic circuit is fixed to the bottom chamber due to the magnetic attraction
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An outer structure of a magnetic circuit is held inside a holder recess of a magnetic circuit holder of a frame. A pressing portion is screw-fixed to a mounting surface 15 of the magnetic circuit holder. Elastically deformable pressing arms are formed at the pressing portion, and the pressing arms press a restriction surface of the outer structure of the magnetic circuit.