Patent ID: 9171535
Filing Date: 2015-10-27
Classification: B32B,G10K,H04M,H04R

Abstract:
1. A waterproof sound-transmitting membrane comprising: a solid resin film having a plurality of through holes that are straight holes having a constant cross-sectional shape, the plurality of through holes extending through the solid resin film along a straight line in a thickness direction of the solid resin film, a density of the through holes being in a range from 1×10 a treatment layer having water repellency, the treatment layer being formed on at least one of two surfaces of the resin film that are opposite to each other in the thickness direction, the treatment layer having openings at positions corresponding to the plurality of through holes, wherein the waterproof sound-transmitting membrane has an air permeability of 100 seconds/100 mL or less in terms of Gurley number.