Nitto-denko Corporation

Nobuharu Kuki

Masaaki Mori

Masashi Kobayashi

Kouji Furuuchi

Yuichi Abe

Teppei Tezuka

Tamao Fukushima

Kazuaki Mochida

The sound-permeable membrane of the present invention is adapted, when placed over an opening for directing sound to or from a sound transducer, to prevent entry of foreign matters into the sound transducer through the opening while permitting passage of sound, the sound-permeable membrane including a non-porous film or a multilayer membrane including the non-porous film. The non-porous film is formed of oriented polytetrafluoroethylene. This sound-permeable membrane has an unconventional configuration and exhibits various excellent properties. At least one principal surface of the non-porous film may have a region subjected to a surface modification treatment.

Sound-permeable membrane, sound-permeable membrane member including same, microphone, and electronic device

A waterproof member () includes a first adhesive layer (), a second adhesive layer (), and a porous layer (). The porous layer () is disposed between the first adhesive layer () and the second adhesive layer (). The first adhesive layer () and the second adhesive layer () each have a frame shape in plan view. When the first adhesive layer (), the second adhesive layer (), and the porous layer () are seen in plan view, the outer boundary of the porous layer () lies within the outer boundary of the first adhesive layer () and the outer boundary of the second adhesive layer (). The first adhesive layer () is bonded directly to the second adhesive layer () in a region outside the outer boundary of the porous layer (). The porous layer () has a peripheral surface that is shielded from outside by the first adhesive layer () and the second adhesive layer ().

Waterproof member and electronic device including the waterproof member

The waterproof sound-permeable membrane of the present disclosure is a waterproof sound-permeable membrane adapted to permit passage of sound and prevent ingress of water. The air permeability of the waterproof sound-permeable membrane, as expressed by Gurley number, is 20 seconds/100 mL or more. The water entry pressure of the waterproof sound-permeable membrane is 500 kPa or more. When a tensile strength at break of the waterproof sound-permeable membrane in a MD direction is denoted by Tand a tensile strength at break of the waterproof sound-permeable membrane in a TD direction orthogonal to the MD direction is denoted by T, a strength ratio (T/T) is in a range of 0.5 to 2.0.

Waterproof sound-permeable membrane, waterproof sound-permeable member, and electronic device

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Osaka, Japan

Nobuharu Kuki