WATERPROOFING SOUND-PASSING MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide a waterproofing sound-passing membrane having high sound-passing property and waterproofness and provide a portable information communication instrument having the waterproofing sound-passing membrane attached to the sound generating part or the sound receiving part. SOLUTION: The waterproofing sound-passing membrane contains a porous plastic membrane 1 free from pores or having an average pore diameter of≤2.0μm and having an areal density of 2-20 g/m2. The portable information communication instrument has the waterproofing sound-passing membrane attached to at least one element selected from sound-receiving part and sound generation part. The porous plastic membrane is preferably e.g. a porous polytetrafluoroethylene membrane or a porous ultra-high-molecular weight polyethylene membrane. The plastic membrane is preferably laminated with a supporting member. The supporting member preferably has e.g. a net or a ring frame form. COPYRIGHT: (C)2004,JPO