WATER PROOF SOUND PASSING MEMBRANE, WATER PROOF SOUND PASSING MEMBER INCLUDING THE SAME, ELECTRONIC APPARATUS, CASE FOR THE SAME, AND WATER PROOF SOUND PASSING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a water proof sound passing membrane, having high resistance to static electricity even when a conductive material is not mixed, whose properties are hard to change even when receiving discharge caused by static electricity.SOLUTION: The sound passing membrane includes a non-porous resin film at which a plurality of through-holes linearly extending penetrating in a thickness direction is formed. A length of a destruction mark formed on a surface by an electrostatic breakdown test performed under conditions of a discharge voltage of 5.0 kV, a discharge distance of 5 mm, and the number of discharges of 10 times is less than or equal to 30 μm.SELECTED DRAWING: Figure 1A