Sound absorption structure body

Abstract

A sound absorption structure body has a housing has a front side and a side face raised at at least a part of an outer edge section of the front face, a gas adsorption body placed in the internal space, surrounded by the front face and the side face, of the housing and physically adsorbing gas in the internal space, a sealing means for sealing the gas adsorption body from the outside, and an acoustic connection section provided at at least either the front face or the side face and functioning as an acoustic mass for acoustically connecting the internal space of the housing and the space outside the housing. The sound absorption structure body achieves both sound absorption in a low -pitched sound range and downsizing of the sound absorption structure body itself.

Description

technical field [0001] The present invention relates to sound-absorbing structures, and more particularly to sound-absorbing structures that absorb noise. Background technique [0002] In recent years, the awareness of the living environment has been increasing, and the need to fully consider the sound environment such as noise from the outside is increasing. In this situation, anti-noise technology can be said to be a very important technology. As the most common noise prevention technology, a sound-absorbing structure 100 utilizing the Helmholtz resonance effect shown in FIG. 17 is known (for example, refer to Patent Document 1). FIG. 17 is a cross-sectional view of a conventional sound-absorbing structure 100 . The sound absorbing structure 100 includes an acoustic port 101 and a box 102 . An opening is formed on the front surface of the case 102, and the acoustic port 101 is fixedly installed. Here, it is assumed that the volume inside the box 102 is V0, the speed of...

AI Technical Summary

Problems solved by technology

That is, in the sound-absorbing structure 100 shown in FIG. 17, it is necessary to enlarge the size of the sound-absorbing structure 110 itself.

In addition, in the sound absorbing structure 110 shown in FIG. 18, it is necessary to increase the thickness of the sound absorbing structure 110 itself.

[0018] When the resonance frequency f0 is lowered in this way, there is a problem that the size of the sound-absorbing structure itself increases or the thickness of the sound-absorbing structure itself increases.

Furthermore, when it is considered that the sound-absorbing structure is installed on, for example, the wall of a living room, there is a problem that the indoor space is limited as the sound-absorbing structure itself increases in size.

As a result, it is difficult for the conventional sound-absorbing structure to achieve both sound absorption in the low-frequency range and miniaturization of the sound-absorbing structure itself.

Images