公开(公告)号：US20210251095A1

公开(公告)日：2021-08-12

申请号：US16973190

申请日：2020-04-24

Applicant: NITTO DENKO CORPORATION

Inventor： Tamao FUKUSHIMA ,  Takeo INOUE ,  Yu KAMAMOTO ,  Hisae KITAGAWA

IPC: H05K5/06 ,  H04R1/44

Abstract: A waterproof membrane of the present disclosure has an insertion loss of 5.0 dB or less for sound with a frequency of 1 kHz, and an insertion loss of 5.0 dB or less for sound with a frequency of 10 kHz when a permeation region for sound of the waterproof membrane has an area of 1.3 mm2. The waterproof membrane of the present disclosure can cope with further size reduction of the permeation region. A waterproof member of the present disclosure includes the above-mentioned waterproof membrane of the present invention and a support member joined to the waterproof membrane.

公开(公告)号：US20220312091A1

公开(公告)日：2022-09-29

申请号：US17605119

申请日：2020-04-24

Applicant: NITTO DENKO CORPORATION

Inventor： Yu KAMAMOTO ,  Takeo INOUE ,  Tamao FUKUSHIMA ,  Hisae KITAGAWA

IPC: H04R1/02 ,  H04R1/28

Abstract: The conversion element member of the present disclosure includes: a conversion element having an opening capable of functioning as a ventilation port and/or a sound-transmitting port; and a waterproof membrane. The conversion element has an outer surface provided with the opening. The waterproof membrane is joined, at a joining portion thereof, to the outer surface of the element so as to cover the opening, the joining portion having a shape surrounding the opening when viewed in a direction perpendicular to the outer surface. The waterproof membrane has a non-joining portion defined as a portion surrounded by the joining portion when viewed in the direction, the non-joining portion having a region overlapping the outer surface when viewed in the direction. A spacing distance D1 between the membrane and the outer surface in the region is 0.01 mm to X mm, where X represents, in an indentation test on the waterproof membrane.

公开(公告)号：US20250018350A1

公开(公告)日：2025-01-16

申请号：US18709940

申请日：2022-11-08

Applicant: NITTO DENKO CORPORATION

Inventor： Kodai UEDA ,  Yu KAMAMOTO ,  Yuichi TAKAMURA ,  Satoru FURUYAMA

IPC: B01D71/32 ,  B01D71/52

Abstract: An air-permeable filter includes a porous fluorine resin membrane having one principal surface and the other principal surface, and treated with an oil-repellent agent for oil-repellency. In a measurement of its absorption spectrum by Fourier-transform infrared spectroscopy, an absorbance ratio Rf of the one principal surface and an absorbance ratio Rb of the other principal surface calculated by Aa/Am are not substantially the same. The Aa indicates an absorbance at a peak derived from the oil-repellent agent in the absorption spectrum, and the Am indicates an absorbance at a peak derived from a C—F bond in the absorption spectrum.

公开(公告)号：US20230068958A1

公开(公告)日：2023-03-02

申请号：US17794405

申请日：2021-07-02

Applicant: NITTO DENKO CORPORATION

Inventor： Yu KAMAMOTO ,  Hisae KITAGAWA

IPC: C08J9/14 ,  B01D46/54 ,  B01D39/16 ,  B29C55/14 ,  B29C55/00 ,  C08J5/18 ,  H05K5/02

Abstract: Provided is a porous polytetrafluoroethylene membrane in which an absolute value of a difference in lightness between one principal surface and the other principal surface is 1.0 or more, where the lightness is lightness L* of CIE 1976 (L*, a*, b*) color space specified in JIS Z8781-4: 2013. The porous polytetrafluoroethylene membrane may be colored black or gray. The porous polytetrafluoroethylene membrane provided can have properties with a reduced coloring-induced deterioration.