Environmentally Robust Electret Condenser Microphone

Yoshinobu YASUNO; Yasuhiro RIKO; Nobuhiro FUNAKOSHI; Takeshi SHIMIZU; Goro YAMAUCHI

doi:10.1093/ietfec/e89-a.8.2226

Environmentally Robust Electret Condenser Microphone

Yoshinobu YASUNO, Yasuhiro RIKO, Nobuhiro FUNAKOSHI, Takeshi SHIMIZU, Goro YAMAUCHI

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We introduced a new electret condenser Microphone (ECM) water repellent coating structure for protection against common hazards, such as water or alcohol. This protection structure is composed of small acoustical holes with a water-repellent coating. The water-repellent coating has a contact angle of more than 150 degrees for water on a small acoustical hole having less than 0.2 mm aperture, which blocks water invasion but allows acoustical transmission. The reliability of the coating was confirmed by several tests, such as long-term immersion in water and alcohol, re-flow soldering test and surface scratching. These tests produced no damage to the coating. The fabricated ECM meets the requirements for the IEC 60526 class 7, which is 30 minutes under water at a depth of 1 meter. The diameter and number of holes is determined both by acoustic characteristics and water resistance.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E89-A No.8 pp.2226-2229

Publication Date: 2006/08/01

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Online ISSN: 1745-1337

DOI: 10.1093/ietfec/e89-a.8.2226

Type of Manuscript: LETTER

Category: Engineering Acoustics

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Yoshinobu YASUNO, Yasuhiro RIKO, Nobuhiro FUNAKOSHI, Takeshi SHIMIZU, Goro YAMAUCHI, "Environmentally Robust Electret Condenser Microphone" in IEICE TRANSACTIONS on Fundamentals, vol. E89-A, no. 8, pp. 2226-2229, August 2006, doi: 10.1093/ietfec/e89-a.8.2226.
Abstract: We introduced a new electret condenser Microphone (ECM) water repellent coating structure for protection against common hazards, such as water or alcohol. This protection structure is composed of small acoustical holes with a water-repellent coating. The water-repellent coating has a contact angle of more than 150 degrees for water on a small acoustical hole having less than 0.2 mm aperture, which blocks water invasion but allows acoustical transmission. The reliability of the coating was confirmed by several tests, such as long-term immersion in water and alcohol, re-flow soldering test and surface scratching. These tests produced no damage to the coating. The fabricated ECM meets the requirements for the IEC 60526 class 7, which is 30 minutes under water at a depth of 1 meter. The diameter and number of holes is determined both by acoustic characteristics and water resistance.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e89-a.8.2226/_p

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@ARTICLE{e89-a_8_2226,
author={Yoshinobu YASUNO, Yasuhiro RIKO, Nobuhiro FUNAKOSHI, Takeshi SHIMIZU, Goro YAMAUCHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Environmentally Robust Electret Condenser Microphone},
year={2006},
volume={E89-A},
number={8},
pages={2226-2229},
abstract={We introduced a new electret condenser Microphone (ECM) water repellent coating structure for protection against common hazards, such as water or alcohol. This protection structure is composed of small acoustical holes with a water-repellent coating. The water-repellent coating has a contact angle of more than 150 degrees for water on a small acoustical hole having less than 0.2 mm aperture, which blocks water invasion but allows acoustical transmission. The reliability of the coating was confirmed by several tests, such as long-term immersion in water and alcohol, re-flow soldering test and surface scratching. These tests produced no damage to the coating. The fabricated ECM meets the requirements for the IEC 60526 class 7, which is 30 minutes under water at a depth of 1 meter. The diameter and number of holes is determined both by acoustic characteristics and water resistance.},
keywords={},
doi={10.1093/ietfec/e89-a.8.2226},
ISSN={1745-1337},
month={August},}

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TY - JOUR
TI - Environmentally Robust Electret Condenser Microphone
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2226
EP - 2229
AU - Yoshinobu YASUNO
AU - Yasuhiro RIKO
AU - Nobuhiro FUNAKOSHI
AU - Takeshi SHIMIZU
AU - Goro YAMAUCHI
PY - 2006
DO - 10.1093/ietfec/e89-a.8.2226
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E89-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 2006
AB - We introduced a new electret condenser Microphone (ECM) water repellent coating structure for protection against common hazards, such as water or alcohol. This protection structure is composed of small acoustical holes with a water-repellent coating. The water-repellent coating has a contact angle of more than 150 degrees for water on a small acoustical hole having less than 0.2 mm aperture, which blocks water invasion but allows acoustical transmission. The reliability of the coating was confirmed by several tests, such as long-term immersion in water and alcohol, re-flow soldering test and surface scratching. These tests produced no damage to the coating. The fabricated ECM meets the requirements for the IEC 60526 class 7, which is 30 minutes under water at a depth of 1 meter. The diameter and number of holes is determined both by acoustic characteristics and water resistance.
ER -