Patent ID: 9121175
Filing Date: 2015-09-01
Classification: B32B,B60R,E04B,G10K

Abstract:
1. A soundproof body comprising: one side layer formed from a porous material, another side layer; and an intermediate layer interposed between said one side layer and said other side layer; wherein said intermediate layer is formed from a sound absorption layer of a membrane-vibration type which is formed from a non-air permeable thin membrane layer of a flexible material, and said other side layer is formed from a perforated sound insulation layer which is formed from a sound insulation material so as to include a plurality of opening portions in a dispersed manner, and wherein an opening ratio and an opening number of the plurality of the opening portions of said perforated sound insulation layer are set respectively in a predetermined opening ratio range and a predetermined opening number range under mass of a laminated body of said non-air permeable thin membrane layer and said perforated sound insulation layer so as to maintain a vibration of said laminated body in relation to noise components of a predetermined low frequency range of noise in a predetermined phase difference range which is predetermined to suppress a resonance phenomenon of said laminated body occurring based on the noise components of the predetermined low frequency range of the noise.