Miniature Speaker Diaphragm Stiffener Border Segmentation
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Solution Overview
Problem
Miniature speakers in mobile devices face limitations in acoustic performance due to a restricted effective radiation area, which cannot be improved without increasing the size of the magnetic circuit unit.
Innovation Solution
The design includes a vibration unit with a diaphragm, stiffener, and border, where the stiffener controls high-frequency vibrations and the border controls low-frequency vibrations, enhancing the effective radiation area and sensitivity without altering the magnetic circuit unit's size, by utilizing a configuration that includes a vibration plate, voice coil, magnetic circuit unit, and a cover providing additional vibration space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size of the magnetic circuit unit is increased to improve acoustic performance, then the effective radiation area of the diaphragm can be enlarged, but the overall size of the speaker increases
Solution Approach 1:
The diaphragm is segmented into multiple functional zones: a central portion with a stiffener for high-frequency control, an intermediate annular region, and an outer annular region with a different stiffness. This segmentation allows each zone to contribute differently to sound radiation, effectively increasing the useful radiation area without increasing the overall diaphragm size or magnetic circuit unit size.
Solution Approach 2:
Different regions of the diaphragm are given different local properties through the addition of stiffeners and varying thicknesses. The central portion has increased stiffness for high-frequency response, while the outer annular region has optimized stiffness for low-frequency response. This local differentiation maximizes the acoustic performance of each area without requiring a larger overall structure.
2Ease of manufacture
If the diaphragm structure is simplified without additional components, then the manufacturing is easier, but the acoustic performance cannot be improved
Solution Approach 1:
The stiffener is integrated directly into the diaphragm structure as a single molded piece rather than being a separate component requiring assembly. The diaphragm and stiffener form an integrated unit that can be manufactured in one process, maintaining ease of manufacture while achieving improved acoustic performance through the optimized structure.
Solution Approach 2:
The diaphragm utilizes composite construction with a base material and integrated stiffening elements, creating a structure that combines the flexibility needed for sound radiation with the stiffness required for controlled vibration. This composite approach achieves superior acoustic performance while maintaining manufacturing simplicity through integrated fabrication.
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 enlarges the effective radiation area of the diaphragm, improving the sensitivity and acoustic performance of the miniature speaker, specifically enhancing its ability to handle high voltage while maintaining a compact size.
Implementation Method 1
a voice coil driving the diaphragm to vibrate
Implementation Method 2
the diaphragm to vibrate for producing audible sounds
Data Source
AI summary
A miniature speaker is disclosed. The miniature speaker includes a frame, a magnetic circuit unit positioned by the frame and forming a magnetic gap, and a vibration unit. The vibration unit includes a vibration plate having a diaphragm including a central portion, a periphery suspending the diaphragm, a suspension surrounding the central portion with an edge connecting to the periphery, a stiffener located on the central portion, a border located on the central portion and surrounding the stiffener, and a voice coil including an inner side and an outer side opposed to the inner side. The border and the stiffener cooperatively form an interval therebetween. The stiffener controls the high frequency vibrations, and the border controls the low frequency vibrations.