Thin Speaker Membrane Segmentation for Vibration Control
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Solution Overview
Problem
Conventional thin speakers with elliptic or polygonal shapes face challenges in maintaining sound quality and volume due to radial segmental vibrations, increased material costs, and complex production processes, particularly in middle-level frequencies and in ultra-thin consumer electronics.
Innovation Solution
A thin speaker structure featuring a circular voice coil, an elliptic membrane with a strengthened central region, and a reduced magnetic circuit member, integrated with a long support frame and elliptic step surface to enhance membrane rigidity and reduce segmental vibrations, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the membrane area is increased to improve volume and bass response, then the sound quality improves, but the speaker thickness increases
Solution Approach 1:
The membrane is divided into a center portion and a peripheral portion, with the center portion having a different shape (round) than the peripheral portion (elliptic). This segmentation allows the center to provide bass response while the peripheral elliptic shape maintains thin profile, resolving the contradiction between volume and thickness.
Solution Approach 2:
Different regions of the membrane are given different properties: the center portion is designed with round shape for bass enhancement, while the peripheral portion uses elliptic shape for thin profile. The voice coil is also positioned specifically at the center to locally enhance bass response without increasing overall thickness.
2Adaptability or versatility
If an elliptic membrane shape is used to fit corner positions, then the speaker adapts to limited space, but radial segmental vibration occurs causing poor middle level frequency performance
Solution Approach 1:
The membrane is segmented into center and peripheral portions with different shapes. The peripheral elliptic portion maintains corner adaptability while the center round portion provides stable vibration characteristics, preventing radial segmental vibration and ensuring good middle level frequency performance.
Solution Approach 2:
The membrane combines symmetric round center portion with asymmetric elliptic peripheral portion. This asymmetric design allows the speaker to fit corner positions while the symmetric center provides stable vibration, resolving the contradiction between adaptability and performance reliability.
3Ease of manufacture
If a round voice coil is used to simplify production, then manufacturing cost and complexity reduce, but the elliptic membrane experiences uneven forces causing segmental vibration
Solution Approach 1:
The membrane is segmented into center and peripheral portions with different shapes. The round center portion works well with the round voice coil for easy manufacturing, while the elliptic peripheral portion provides the necessary shape for thin profile. This segmentation allows round components for simplicity while maintaining overall performance.
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 solution improves sound quality and volume by reducing radial segmental vibrations, lowering material costs, and simplifying production, while ensuring the speaker remains thin enough for consumer electronics applications.
Implementation Method 1
a voice coil 30 installed in the magnetic circuit member 20; wherein the hollow portion, the magnetic circuit member 20 and the voice coil 30 are in circular shapes
Implementation Method 2
the membrane 71 and the voice coil are proportional concentric circles. When the membrane 71 is axially moved up and down by the voice coil
Data Source
AI summary
A thin speaker structure comprises: a long support frame; a magnetic circuit member; a voice coil; a membrane; wherein the magnetic circuit member and voice coil are rounded and the membrane includes an elliptic surrounding and an elliptic body with a center portion and a peripheral portion; the peripheral portion is fixed to a bottom edge of an inner surface of the surrounding and the center portion corresponding to the peripheral portion defines a rigid strengthened region in a longer elliptic shape; the center portion has a length of a long side longer than a diameter of the voice coil at a predetermined distance; whereby the elliptic body is combined with the circular voice coil to form a vibrating structure in order to increase the rigidity of the membrane.