Rear cavity filler for reducing resonant frequency of loudspeaker and preparation method thereof

Abstract

The invention discloses a rear cavity filler for reducing the resonant frequency of a loudspeaker and a preparation method thereof. A mesoporous material is creatively and independently applied as theback cavity filler of the micro loudspeaker, the forming method is simple, and the mesoporous silica microsphere can be obtained by coating the mesoporous material raw material through a microemulsion method and tetrabutyl orthosilicate chemical hydrolysis and is used as the back cavity filler. The mesoporous silica microsphere with larger specific surface area and pore volume has more advantagesfor the adsorption and desorption process of the actual back cavity gas, and better virtually increases the volume of the resonance space of the back cavity of the loudspeaker, so that the resonancefrequency of the low-frequency band of the loudspeaker is reduced. The mesoporous silica microspheres have uniform and adjustable mesoporous material pore diameters and rich and diverse pore channel structures, so that the influence factors of the low-frequency output performance of the loudspeaker can be studied more conveniently by regulating and controlling conditions. Due to the existence of the mesopores, the diffusion of gas in the pore channels is accelerated, the damping of the loudspeaker is reduced, the low-frequency output of the loudspeaker is remarkably improved, and the low-frequency acoustic performance of the loudspeaker is improved.

Description

technical field [0001] The invention relates to the field of loudspeakers, in particular to a back cavity filler and a preparation method for reducing the resonance frequency of the loudspeaker. Background technique [0002] Loudspeakers, as vibrating sound devices, are widely used. For each speaker, the effective sound frequency it can emit has a certain range, which is between the low frequency lower limit frequency and the high frequency upper limit frequency. Wherein, the low frequency lower limit frequency is the resonance frequency of the speaker, and the intersection of the high frequency end of the frequency response curve is the high frequency upper limit frequency. In general, speakers can be simply divided into: woofers with a frequency range of 20H Z ~3000H Z between; midrange speaker, frequency range in 500H Z ~5000H Z between; and tweeters, the frequency range is 2 ~ 20000H Z between. [0003] Therefore, the resonance frequency is an important parameter ...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned patent, because the molecular sieve material is still used in combination, it also has the disadvantages of filling the above-mentioned molecular sieve material

[0007] However, the use of mesoporous materials alone as back cavity fillers has not been reported yet.

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