JP6118131B2 - 防水通音膜、通音部材、及び電気機器 - Google Patents
防水通音膜、通音部材、及び電気機器 Download PDFInfo
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Description
ポリテトラフルオロエチレンを主成分とする多孔質膜と、
前記多孔質膜を積層した状態で延伸されることなく前記多孔質膜と一体化されており、前記多孔質膜を支持している支持材と、を備え、
前記支持材は、線径が前記支持材全体において45〜60μmであり、かつ、オープニングが700〜1100μmであるメッシュ又はネットであり、
JIS L1092のB法(高水圧法)に基づいて測定される耐水圧が20kPa以上である、防水通音膜を提供する。
上記の防水通音膜と、
前記防水通音膜を支持している膜支持材と、を備える通音部材を提供する。
発音部又は受音部を備えた電気機器であって、
前記発音部又は前記受音部に対応する筐体の開口を塞ぐように、上記の防水通音膜又は上記の通音部材が配置されている、電気機器を提供する。
多孔質膜又は防水通音膜の通気度をJIS(日本工業規格) L 1096に規定されている通気性測定法のB法(ガーレー法)に準拠して評価した。
多孔質膜又は防水通音膜の耐水圧を、耐水度試験機を用いて、JIS L 1092:2009に記載されているB法(高水圧法)に基づいて測定した。ただし、この規定に示された試験片の面積では多孔質膜が著しく変形するので、ステンレスメッシュ(開口径:2mm)を多孔質膜又は防水通音膜の加圧面の反対側に設けることによって樹脂多孔質膜の変形をある程度抑制した状態で、多孔質膜又は防水通音膜の耐水圧を測定した。
コピー用紙(普通紙)と、多孔質膜又は防水通音膜とを、コピー用紙が下になるように積層し、スポイトを用いて多孔質膜に灯油を一滴垂らした後1分間放置した。その後、多孔質膜を取り除いてコピー用紙の状態を確認し、コピー用紙が灯油で濡れている場合を撥液性なし、コピー用紙が灯油で濡れていない場合を撥液性ありと評価した。
作製した防水通音膜の音響特性を以下のように評価した。最初に、図5に示すように、携帯電話の筐体を模したポリスチレン製の模擬筐体20(外形60mm×50mm×28mm)を準備した。この模擬筐体20は、径が2mmであるスピーカー取付穴22及びスピーカーケーブル44の導通孔24を1つずつ有している。模擬筐体20は、スピーカー取付穴22及び導通孔24以外に開口を有していない。次に、図5に示すように、径が5mmの通音孔32を有する、ウレタン製のスポンジで形成された充填材30にスピーカー40(スター精密社製、SCG−16A)を取り付け、模擬筐体20の内部に封入した。スピーカーケーブル42を導通孔24から模擬筐体20の外部へ導き出した。その後、導通孔24をパテで塞いだ。
PTFEファインパウダー(ダイキン工業社製、F−104)100重量部と、炭化水素油(エッソ社製、アイソパーM)20重量部とを均一に混合し、得られた混合物をシリンダーによって圧縮した後にラム押出しを行ってシート状の混合物を得た。次に、得られたシート状の混合物を一対の金属ロールを通して厚さ0.16mmに圧延し、さらに150℃の加熱によって成形助剤を乾燥除去してPTFEのシート成形体を得た。
CH2=CHCOOCH2CH2C6F13 (式1)
支持材として、線径が55μm及びオープニングが1000μmであるPET製のメッシュ(日本特殊織物社製、華24−30)を用いた以外は実施例1と同様にして、実施例2に係る防水通音膜を得た。
支持材として、線径が48μm及びオープニングが206μmであるポリエステル製のメッシュ(日本特殊織物社製、LX 100SS)を用いた以外は、実施例1と同様にして、比較例1に係る防水通音膜を得た。
支持材として、線径が85μm及びオープニング300μm×800μmであるポリプロピレン(PP)製のメッシュ(デルスター社製、デルネットRB0707−30P)を用いた以外は、実施例1と同様にして比較例2に係る防水通音膜を得た。
PTFEファインパウダー(ダイキン工業社製、ポリフロンF−104U)100重量部に炭化水素油(アイソパーM、エッソ石油社製)25重量部を均一に混合した混和物をペースト状に押出して棒状に予備形成を行った。この予備形成物を、一対の金属製圧延ロールの間に通し、厚み0.2mm、幅370mmの未焼成テープを得た。次に、この未焼成テープをロール延伸機によってPTFEの融点以上の温度(375℃)で縦方向に20倍に延伸し、縦方向延伸済焼成PTFEシートを得た。次に、支持材である、オープニング(網目の大きさ)が300μm×800μm、線径(繊維系)が85μmである格子構造のPP製のネットを上記の縦方向延伸済焼成PTFEシートの一方の主面にネットの融点以上の温度(180℃)、圧力5kg/cm2でラミネートした。次に、ラミネート後のPTFEシートをキスコーターにより撥水剤(商品名:スコッチガードFX3576)100重量部と黒色染料(商品名:バリファーストブラック)190重量部とが混合された処理剤を用いて着色処理を行った。着色処理後、このPTFEシートをテンターによって温度130℃で横方向に3倍延伸し、比較例3に係る防水通音膜を得た。すなわち、比較例3に係る防水通音膜において、支持材であるPP製のネットは、多孔質膜であるPTFEシートに積層された状態で横方向に3倍に延伸されている。この横方向の延伸によって、PP製のネットの横方向のオープニングは300μmから900μmへと変化した。また、PP製のネットの横方向に延びる糸の線径は85μmから49μmへ変化した。一方、PP製ネットの縦方向に延びる糸の線径は85μmのままであった。
特開平10−165787号公報の実施例1に記載の方法と同様にして、比較例4に係る防水通音膜を得た。具体的には、以下のようにして比較例4に係る防水通音膜を得た。まず、PTFEファインパウダー(ダイキン工業社製、ポリフロンF−104U)100重量部に炭化水素油(アイソパーM、エッソ石油社製)25重量部を均一に混合した混和物をペースト押し出して棒状に予備成形を行った。この予備成形物を、一対の金属製圧延ロールの間に通し、厚み0.2mm、幅370mmの未焼成テープを得た。ついで、この成形物を、ロール延伸機によってPTFEの融点以上の温度(375℃)で縦方向に50倍延伸し、縦方向延伸済焼成PTFEシートを得た。一方、オープニング(網目の大きさ)が1000μm、線径(繊維系)が85μmである格子構造のPP製のネットをそのネットの融点以下の温度(130℃)で縦方向に5倍延伸した。この延伸によって、PP製のネットの縦方向のオープニングは1000μmから5000μmへと変化した。また、PP製のネットの縦方向に延びる糸の線径は85μmから38μmへ変化した。
3 通音部材
11 多孔質膜
12 支持材
100 電気機器
Claims (6)
- ポリテトラフルオロエチレンを主成分とする多孔質膜と、
前記多孔質膜を積層した状態で延伸されることなく前記多孔質膜と一体化されており、前記多孔質膜を支持している支持材と、を備え、
前記支持材は、線径が前記支持材全体において45〜60μmであり、かつ、オープニングが700〜1100μmであるメッシュ又はネットであり、
JIS L1092のB法(高水圧法)に基づいて測定される耐水圧が20kPa以上である、防水通音膜。 - 3000Hzの音に対する挿入損失が5dB以下である、請求項1に記載の防水通音膜。
- 前記支持材は、ヤング率が0.2〜7.0GPaである樹脂材料によって形成されている請求項1又は2に記載の防水通音膜。
- 前記多孔質膜の面密度が2.0〜10.0g/m2である、請求項1〜3のいずれか1項に記載の防水通音膜。
- 請求項1〜4のいずれか1項に記載の防水通音膜と、
前記防水通音膜を支持している膜支持材と、を備える通音部材。 - 発音部又は受音部を備えた電気機器であって、
前記発音部又は前記受音部に対応する筐体の開口を塞ぐように、請求項1〜4のいずれか1項に記載の防水通音膜又は請求項5に記載の通音部材が配置されている、電気機器。
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JP2013035079A JP6118131B2 (ja) | 2013-02-25 | 2013-02-25 | 防水通音膜、通音部材、及び電気機器 |
US14/766,542 US9578402B2 (en) | 2013-02-25 | 2013-10-28 | Waterproof sound-transmitting membrane, sound-transmitting member, and electrical device |
KR1020157025553A KR20150122693A (ko) | 2013-02-25 | 2013-10-28 | 방수 통음막, 통음 부재 및 전기 기기 |
PCT/JP2013/006350 WO2014128799A1 (ja) | 2013-02-25 | 2013-10-28 | 防水通音膜、通音部材、及び電気機器 |
CN201380073765.1A CN105009603A (zh) | 2013-02-25 | 2013-10-28 | 防水透声膜、透声构件及电气设备 |
TW102139723A TW201440532A (zh) | 2013-02-25 | 2013-11-01 | 防水透音膜、透音構件及電氣製品 |
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