Miniature Speaker Second Diaphragm Suspension Width Variation
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Solution Overview
Problem
The existing miniature speakers in portable devices face limitations in sound quality due to the even width of the suspension in the second diaphragm, which restricts the rigidity and stability of the vibration system, leading to compromised sound reproduction.
Innovation Solution
The design incorporates a second diaphragm with a main suspension and auxiliary suspensions of varying widths, enhancing lateral rigidity and vibration stability by suppressing lateral swing, while allowing for improved sound quality and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the suspension of the second diaphragm has an even width, then the structure is simple and easy to manufacture, but the rigidity of the second diaphragm is limited and the vibration stability is compromised
Solution Approach 1:
The suspension is designed with non-uniform width where the first portion (connected to frame) has greater width than the second portion (connected to voice coil). This local variation in width provides different stiffness characteristics at different locations, enhancing overall vibration stability while maintaining manufacturing simplicity through a single-piece construction.
2Ease of manufacture
If the suspension has even width, then the manufacturing process is simple, but the lateral rigidity of the second diaphragm is insufficient leading to lateral swing
Solution Approach 1:
The suspension features a first portion with greater width than the second portion. The wider first portion provides enhanced lateral rigidity to prevent lateral swing of the second diaphragm, while the overall single-piece design maintains manufacturing simplicity.
3Stability of the object's composition
If the suspension width is increased to improve rigidity, then the vibration stability improves, but the device size increases
Solution Approach 1:
Instead of uniformly increasing suspension width, the design applies increased width only to the first portion where it is most needed for stability. The second portion maintains smaller width, thereby improving vibration stability without proportionally increasing overall device size.
Solution Approach 2:
The suspension is divided into two portions with different width characteristics. This segmentation allows optimized rigidity distribution - wider at the frame connection for stability, narrower at the voice coil connection for compactness - resolving the size-stability tradeoff.
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 configuration enhances the vibration efficiency and stability of the miniature speaker, resulting in improved sound quality and reduced noise, effectively addressing the limitations of the previous designs.
Implementation Method 1
a magnetic circuit system (3) supported by the frame (1), wherein the magnetic circuit system (3) is used for driving the vibration system (2) to produce sounds
Implementation Method 2
an elastic member (24) disposed at the second diaphragm (22), wherein the elastic member (24) has two ends, a first end and a second end; the first end is fixed to the frame (1) and the second end is fixed to the voice coil (23)
Data Source
AI summary
The present application discloses a miniature speaker, including: a frame; a vibration system positioned on the frame; a magnetic circuit system for driving the vibration system. The vibration system includes a first diaphragm fixed to the frame, a second diaphragm, and a voice coil for driving the first diaphragm to produce sounds. The second diaphragm includes a suspension, a first fastening portion fixed to the frame, a second fastening portion fixed to the voice coil at an end away from the first diaphragm. The suspension includes a main suspension and a pair of auxiliary suspensions extending from two edges of the main suspension along a length direction of the main suspension. A width of the main suspension is greater than a width of the auxiliary suspension. The rigidity of the second suspension is improved, and the lateral swing of the vibration system is suppressed.