Hydrophobic and oleophobic membrane, and waterproof sound device using same

    公开(公告)号:US10477305B2

    公开(公告)日:2019-11-12

    申请号:US15622567

    申请日:2017-06-14

    Inventor: Yong Sik Jung

    Abstract: Provided is a waterproof sound device including: an acoustic unit that emits or receives sound; and a membrane that vibrates to transmit the sound emitted from the acoustic unit to the outside or to transmit sound from the outside to the acoustic unit, wherein a distance from the membrane to the acoustic unit is determined to be greater than the maximum vibration width of the width of the vibration of the membrane that vibrates toward the acoustic unit.

    Heat radiation sheet and method of manufacturing same

    公开(公告)号:US11456230B2

    公开(公告)日:2022-09-27

    申请号:US17016832

    申请日:2020-09-10

    Abstract: Provided is a method of manufacturing a heat radiation sheet. The method includes the steps of: electrospinning a first spinning solution comprising an adhesive, first heat conductive particles, and a first solvent to form an adhesive layer in a form of a nano-web having a plurality of pores; mixing second heat conductive particles and a second solvent to obtain a second spinning solution; electrospinning the second spinning solution onto the adhesive layer to form an intermediate layer; mixing a polymer material, a third solvent, and third heat conductive particles to obtain a third spinning solution; and electrospinning the third spinning solution onto the intermediate layer to form a heat radiation layer in a form of a web on the intermediate layer.

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