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

    公开(公告)号:US10028043B2

    公开(公告)日:2018-07-17

    申请号:US15655087

    申请日:2017-07-20

    IPC分类号: H04R1/02 H04R1/44

    摘要: 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 T1 and a tensile strength at break of the waterproof sound-permeable membrane in a TD direction orthogonal to the MD direction is denoted by T2, a strength ratio (T1/T2) is in a range of 0.5 to 2.0.

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

    公开(公告)号:US10547925B2

    公开(公告)日:2020-01-28

    申请号:US15519302

    申请日:2015-10-15

    IPC分类号: H04R1/02 H04R1/08 C08J7/12

    摘要: 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.