Speaker diaphragm and manufacture method thereof

Abstract

The invention provides a speaker diaphragm. The speaker diaphragm comprises Kevlar fiber woven cloth and a PMI composite layer, wherein the PMI composite layer comprises more than one PMI layer of different densities. Base materials of the diaphragm comprise woven KEVLAR fiber and a PMI foaming material. The reason of using the two materials is that the two materials have very similar physical characteristics, like high rigidity, high modulus, low density, high temperature resistance (-190DEG C-200DEG C) and very low coefficient of thermal expansion, high corrosion resistance, and high fatigueresistance; further, the two materials have equal direction mechanical property, that is, isotropy. The internal damping can be adjusted, so that the internal damping of the overall diaphragm can beadjusted by changing the density of a rear damping material, then the resonance property of the composite diaphragm can be changed, the resonance frequency of the diaphragm is far from the working frequency range, therefore, in the effective working frequency range, segmentation vibration is reduced to the greatest extent, then distortion is lowered.

Description

technical field [0001] The invention relates to a loudspeaker, in particular to a loudspeaker diaphragm and a preparation method thereof. Background technique [0002] The diaphragm is the core component of the speaker, and its material and characteristics directly determine the sound quality and performance of the speaker. An ideal diaphragm should have the following characteristics: 1. Light—light weight and low density; 2. High rigidity—high elastic modulus; 3. Appropriate internal damping—suppresses resonance. [0003] Among the many performance indicators of the speaker, the most important is the transient characteristic, because it directly reflects the acoustic characteristics of the speaker, namely: resolution (clarity) and restoration (fidelity). In other words, the transient characteristics play a decisive role in whether the sound signal can be reproduced realistically. Usually, the test indexes of transient characteristics include impulse response curve and tim...

AI Technical Summary

Problems solved by technology

[0010] 1. Due to the large difference in the thermal expansion and contraction characteristics of the material, the separation and detachment of the composite layer is caused

[0011] 2. Due to the large difference in the elastic modulus of the material, the difference in the inherent resonance frequency is large. Therefore, as the vibration frequency of the diaphragm increases, a certain material resonates, which causes the composite diaphragm to vibrate asynchronously, so that Its overall failure or resonance distortion can not adapt to the practical application of higher operating frequency or greater dynamics

In the field of professional sound reinforcement, high power and large dynamics are the normal application, so the above-mentioned type of composite diaphragm will be difficult to adapt (usually used in civil, Hi-Fi and other near sound field, small dynamic places)

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