CN207128368U - A kind of composite sound-absorbing cotton for loudspeaker module - Google Patents

Abstract

The utility model, which discloses, provides a kind of composite sound-absorbing cotton for loudspeaker module, and acoustical cotton sequentially consists of double faced adhesive tape, microporous polyurethane acoustical cotton, three chlorocyanamide ultramicropore acoustical cottons and the perforate acoustical cotton of polyurethane half.The utility model is not only able to strengthen debugging effect to the acoustics of loudspeaker using different acoustical cottons, and can reduce acoustical cotton quantity, significantly increases operating efficiency, significantly reduces production cost.

Description

A kind of composite sound-absorbing cotton for loudspeaker module

Technical field

The design field of loudspeaker module is the utility model is related to, more particularly to a kind of answering for loudspeaker module Close acoustical cotton.

Background technology

Acoustical cotton is molded using single material foaming mostly at present, but the acoustical cotton pair of unlike material or different compression ratios Acoustics debugging effect is different, and we use a variety of variety classes acoustical cotton cottons in an inside cavity sometimes, to meet Various performance requirements, but this can cause the increase of acoustical cotton quantity, cost of labor rise, the utility model overcomes the above and asked Topic, different acoustical cottons can either be utilized to strengthen debugging effect to the acoustics of loudspeaker, acoustical cotton quantity can be reduced again, significantly Operating efficiency is improved, significantly reduces production cost.

The content of the invention

The purpose of this utility model is to provide a kind of composite sound-absorbing cotton for loudspeaker module, composite sound-absorbing cotton suction Audio fruit is good.

To achieve the above object, the utility model provides following technical scheme：

A kind of acoustical cotton, it is characterised in that there is two layers or more than two layers structure, every layer using unlike material or different pressures Contracting passes through the techniques such as bonding agent, ultrasound, hot pressing than expanded material, between each layer and combined.

Preferably, the acoustical cotton material is three chlorocyanamides, polyurethane foam class acoustical cotton；

Preferably, the acoustical cotton is 2:1、3:1、5:The different compression ratios such as 1；

Preferably, the acoustical cotton thickness is in 0.5mm -0.8mm；

Preferably, combined between each layer of the acoustical cotton by techniques such as double faced adhesive tape, ultrasound, hot pressing；

According to double faced adhesive tape technique for sticking, glue-line need to be bonded acoustical cotton edge or corner, to ensure that acoustical cotton is breathed freely Property；According to ultrasonic technique, ultra-sonic welded frequency is 20KHz, weld interval 0.2s；According to heat pressing process, thermal head temperature 150-200 DEG C, hot pressing time 1s.

Understand that compared with existing acoustical cotton, the utility model makes full use of all kinds of acoustical cottons via above-mentioned technical scheme Tuning effect, reduce acoustical cotton quantity, reduce production cost.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

Fig. 1 is case of the present utility model, and acoustical cotton is successively from bottom to up：1st, double faced adhesive tape, 2, microporous polyurethane 3:1 inhales Sound cotton, 3, three chlorocyanamide ultramicropores 5:1 acoustical cotton, 4, the perforate 2 of polyurethane half:1 acoustical cotton.

Each acoustical cotton thickness is 0.5mm, three chlorocyanamide acoustical cotton average sound absorption coefficients 0.98, is had in the material a large amount of The micropore being mutually communicated（Aperture size is in 30um-150um）, there is good gas permeability, its operation principle is that a large amount of micropores can Increase dischargeable capacity, so as to effectively reduce F0 about 40-50Hz, improve the replaying bass performance of system, lift low frequency sensitivity 0.5-1dB, microporous polyurethane acoustical cotton average sound absorption coefficient 0.96, in 60um-200um, skeleton is wider, can be effective in its aperture Suppress standing wave, the loudness of lifting system；The perforate acoustical cotton acoustic absorptivity 0.38 of polyurethane half, it is empty because the number of openings is relatively fewer Qi leel is analysed converts acoustic energy into heat energy with material friction, so as to suppress cavity resonant, improves systematic distortion.

First by each layer acoustical cotton corner gum, glue thickness 0.05mm, the acoustical cotton for respectively carrying gum is then bonded in one Play pressurize, dwell time 2s.

Described above is only preferred scheme of the present utility model, it is noted that for the ordinary skill people of the art For member, on the premise of the utility model technical principle is not departed from, some improvement and modification can also be made, above-mentioned hypothesis These improvement and modification also should be regarded as the scope of protection of the utility model.

Claims (1)

1. A kind of 1. composite sound-absorbing cotton for loudspeaker module, it is characterised in that：The acoustical cotton sequentially consists of two-sided Glue, microporous polyurethane acoustical cotton, three chlorocyanamide ultramicropore acoustical cottons and the perforate acoustical cotton of polyurethane half.