US-12627920-B2 - Expandable acoustic reinforcement member and manufacturing method therefor and use thereof

US12627920B2US 12627920 B2US12627920 B2US 12627920B2US-12627920-B2

Abstract

An expandable acoustic reinforcement member and a manufacturing method therefor and the use thereof. When one or more expansion trigger conditions are applied, an apparent volume of the member is increased, and an internal pore volume is increased. The member is applied to a loudspeaker, and an expansion trigger treatment is performed on the member, so that the apparent volume of the member is increased, and the internal pore volume is increased, such that the acoustic performance of the loudspeaker assembled with the member is improved; meanwhile, pressing is performed between the members, and between the member and a cavity wall of a specific space of the loudspeaker, so that the member is fixed, thereby achieving the effects of eliminating noise in the use process of the loudspeaker and preventing collisions and crushing of the member to generate falling powder, and prolonging the service life of the member.

Inventors

Lei Zhang
Junjie Zhao
Renkun LIU
Zhendan ZHANG
Mingbo GUO
Yuanhong Ma

Assignees

SSI NEW MATERIAL (ZHENJIANG) CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240219
Priority Date: 20210819

Claims (17)

1 . An expandable acoustic enhancer, wherein the expandable acoustic enhancer has an increase in apparent volume and an increase in internal pore volume upon application of one or more expansion triggering conditions; wherein the expandable acoustic enhancer is produced by mixing raw materials for preparing the expandable acoustic enhancer with a solvent to formulate an expandable acoustic enhancing slurry and then molding the slurry; wherein the raw materials comprise a gas adsorption material, a binder and an expandable material; alternatively, the raw materials comprise a gas adsorption material and an expandable binder.
2 . The expandable acoustic enhancer according to claim 1 , wherein the expandable acoustic enhancer has homogeneous properties from its inside to its surface and is not layered.
3 . The expandable acoustic enhancer according to claim 1 , wherein upon application of one or more expansion triggering conditions, the expandable acoustic enhancer has an apparent volume which is 105%-150% of its apparent volume before application of the expansion triggering conditions.
4 . The expandable acoustic enhancer according to claim 1 , wherein the expansion triggering conditions include one or more of mechanical force, temperature, humidity, acoustic wave, light, electric current, magnetic field force, chemical atmosphere and air pressure.
5 . The expandable acoustic enhancer according to claim 1 , wherein in the initial state, when the expandable acoustic enhancer is expandable acoustic enhancing particles, the expandable acoustic enhancing particles have a diameter of 50-900 μm, and when the expandable acoustic enhancer is expandable acoustic enhancing sheets, the expandable acoustic enhancing sheets have a thickness of 50-900 μm.
6 . The expandable acoustic enhancer according to claim 1 , when the raw materials comprise a gas adsorption material, a binder and an expandable material, the expandable material is included in an amount of 0.1-10% and the binder is included in an amount of 1-10%, based on 100% of the total weight of the gas adsorption material; and when the raw materials comprise a gas adsorption material and an expandable binder, the expandable binder is included in an amount of 0.5-10%, based on 100% of the total weight of the gas adsorption material; wherein the amount of the binder and expandable binder is measured based on the solid content in the binder or expandable binder.
7 . The expandable acoustic enhancer according to claim 6 , wherein the gas adsorption material comprises one or more of molecular sieves, activated carbon, porous metal oxides and porous metal-organic frameworks.
8 . The expandable acoustic enhancer according to claim 6 , wherein the expandable material comprises one or more of expandable microspheres, expandable graphite, and foaming materials.
9 . The expandable acoustic enhancer according to claim 6 , wherein the expandable binder comprises one or more of polyurethane-based binders and phenolic resin-based binders.
10 . A method for producing the expandable acoustic enhancer according to claim 1 , comprising: sufficiently mixing raw materials for preparing the expandable acoustic enhancer with a solvent to obtain an expandable acoustic enhancing slurry; and then molding the expandable acoustic enhancing slurry to produce the expandable acoustic enhancer.
11 . A speaker comprising the expandable acoustic enhancer according to claim 1 , wherein the speaker comprises one or more acoustic sensors, one or more housings, and one or more expandable acoustic enhancers; the one or more acoustic sensors and the one or more housings are combined to form a rear cavity of the speaker, and the one or more expandable acoustic enhancers are positioned in the rear cavity of the speaker.
12 . A method for assembling the expandable acoustic enhancer according to claim 1 , comprising assembling the one or more expandable acoustic enhancers in a specific container to reach an initial assembling state, and applying one or more expansion trigger conditions such that the apparent volume of the one or more expandable acoustic enhancers reaches a target value, so that the one or more expandable acoustic enhancers achieve a completed assembling state.
13 . The method for assembling the expandable acoustic enhancer according to claim 12 , wherein the specific container is the rear cavity of the speaker.
14 . The method for assembling the expandable acoustic enhancer according to claim 12 , wherein the specific container is a package for wrapping the expandable acoustic enhancer.
15 . The method for assembling the expandable acoustic enhancer according to claim 12 , wherein the expandable acoustic enhancer has an apparent volume target value which is 105%-150% of its apparent volume before application of the expansion triggering conditions.
16 . An electronic device, provided with the expandable acoustic enhancer according to claim 1 in a rear cavity of a speaker of the electronic device.
17 . The electronic device according to claim 16 , wherein the electronic device comprises a smartphone, a TWS earphone, a headset, a smart glass, a smart watch, a tablet PC or a lightweight laptop.

Description

FIELD OF TECHNOLOGY The present invention relates to an expandable acoustic enhancer and the production method and application thereof, which belongs to the technical field of electroacoustic products. BACKGROUND ART European Patent EP 2424270 A1 discloses a technique for virtually enlarging the rear cavity of a speaker with zeolite materials. By arranging acoustic enhancing materials with gas adsorption and desorption capabilities, such as zeolite and activated carbon, in the speaker cavity, the performance of the speaker can be achieved as if the volume of the cavity had been doubled while the volume of the cavity remained unchanged. In recent years, this technology has been widely used in speakers for smartphones, tablet PCs, thin and light laptops, and other devices, enabling them to achieve better acoustic performance with limited volume and space. At present, the acoustic enhancing material is mostly in the form of granular microspheres having a diameter of 100-600 micrometers. The application of the granular microspheres to the back cavity of a micro-speaker can achieve the effect of lowering the lowest resonance frequency, enhancing the low frequency sensitivity, and improving the low frequency performance of the speaker. However, the particle-type acoustic enhancing material has been reported to have problems such as particle fragmentation, powder shedding, and collision murmur during its application. This problem is especially obvious in low-temperature environments, and the reasons for this type of problem include: the morphology of the acoustic enhancing material particles and the limitations of the filling technology. Specifically, the acoustic enhancing material particles in the speaker cavity space is difficult to reach 100% full, that is, there will be free space for free movement of the acoustic enhancing material particles in the cavity. In addition, when the speaker is in operation, the diaphragm pushes the airflow, and the airflow pushes the acoustic enhancing material particles, causing the acoustic enhancing material particles to vibrate, which leads to collisions between the acoustic enhancing particles and between the acoustic enhancing particles and the speaker housing, resulting in the above problem. In addition, due to the current rise in consumer demand for sound performance in electronic devices, speaker design requires lower F0 values and tends to improve sound performance by increasing amplitude. However, the negative effects include an increase in the operating temperature of the speaker, etc., and the existing acoustic enhancing material particles usually have low thermal conductivity, which is not conducive to heat dissipation in the speaker. In this regard, Chinese patent CN 111163392 A aims to secure acoustic enhancing material particles by simply mixing expandable microspheres with acoustic enhancing material particles and then filling them in a speaker. However, the technical solution has the following drawback: the prior art only simply mixes the acoustic enhancing material particles with the expandable microsphere material, but in actual mass production applications, it tends to occur that the ratio of the expandable microsphere material to the acoustic enhancing material particles in a single micro-speaker after filling is not consistent with the target ratio in the mass mixing. This leads to poor homogeneity of the acoustic performance of the same batch of speakers, and it is not possible to truly realize reliable large-volume industrialized production. Chinese patent CN 111534017 A discloses an improvement on the basis of the above scheme, in which the dispensable material are bonded one by one with the acoustic conditioning material particles to realize the purpose of collision buffering of the acoustic conditioning material particles. However, the technical solution still has the following drawbacks: the volume of acoustic conditioning material that can be filled in the same fillable space decreases significantly in order to realize effective collision cushioning. Moreover, in order to realize effective bonding, the acoustic conditioning material particles need to lose a certain amount of surface area, which reduces the number of channels through which air can enter the acoustic conditioning material particles. Both of these factors result in a reduction in the acoustic performance of the speaker fitted with this component compared to a speaker fitted with conventional acoustic conditioning material. In addition, the size of the particles of the conventional acoustic conditioning material is on the order of micrometers, and this technical solution is also unable to realize reliable large-volume industrial production. Therefore, it is a technical problem urgently to be solved in the field to provide a novel expandable acoustic enhancer and the production method and use thereof. SUMMARY OF THE INVENTION In order to solve the above-mentioned disadvantages and defect