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1. (WO2018020987) WATERPROOF SOUND-TRANSMISSIVE COVER, WATERPROOF SOUND-TRANSMISSIVE COVER MEMBER AND ACOUSTIC DEVICE

Pub. No.:    WO/2018/020987    International Application No.:    PCT/JP2017/024970
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Sat Jul 08 01:59:59 CEST 2017
IPC: H04R 1/02
H04R 1/08
B01D 71/48
Applicants: W. L. GORE & ASSOCIATES, CO., LTD.
Inventors: KURIHARA, Yasuhiro
KENALEY, Ryan
OSUGI, Nobuyuki
SAEKI, Takayuki
NAKAMURA, Ryosuke
NAMBA, Takafumi
Title: WATERPROOF SOUND-TRANSMISSIVE COVER, WATERPROOF SOUND-TRANSMISSIVE COVER MEMBER AND ACOUSTIC DEVICE
Abstract:
The waterproof sound-transmissive cover is characterized by providing a frequency response curve with a difference between a maximum sound pressure level and a minimum sound pressure level of 13.0 dB or less in the range of frequencies from 3 kHz to 8 kHz, and an insertion loss at 1 kHz of less than 14.0dB, and said cover comprising: a porous film having (1) a water pressure resistance measured according to JIS L1092 water penetration test method B (high pressure method) of 20 kPa or more, and air permeability measured according to JIS L1096 method A (Frazier type method) of 3.0 cc/cm2・sec or more, and (2) a tensile strength measured according to ASTM standards D412 of 5.5N or more.