JP2014050046A - 静電型スピーカ - Google Patents
静電型スピーカ Download PDFInfo
- Publication number
- JP2014050046A JP2014050046A JP2012193479A JP2012193479A JP2014050046A JP 2014050046 A JP2014050046 A JP 2014050046A JP 2012193479 A JP2012193479 A JP 2012193479A JP 2012193479 A JP2012193479 A JP 2012193479A JP 2014050046 A JP2014050046 A JP 2014050046A
- Authority
- JP
- Japan
- Prior art keywords
- buffer member
- fine particles
- functional group
- vibrating membrane
- inorganic fine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Abstract
【解決手段】静電型スピーカは、薄膜状部材からなる振動膜と、前記振動膜に対向して配置される導電性の音響透過性を有する平面電極と、前記振動膜と前記平面電極との間に配置され、その表面にカチオン性の官能基を導入した材料で形成される緩衝部材と、を備えることを特徴とする。
【選択図】図1
Description
(実施例1)
まず、振動膜は、ポリエステルフィルム(東レ(株)製、厚さ1.4μm)に対して、フッ素系皮膜材料として、CT-solv.100E(商品名:旭硝子(株)製)にて希釈したサイトップ(商品名:旭硝子(株)製CTL-102AE)を浸漬にて塗布し、100℃で、1分間乾燥して作製した。
カチオン性官能基量(mmol/g)=1000(W2-W1)/73/W1 (1)
ここで、W1はGMAグラフト不織布(アミノ基導入前の緩衝部材)の重量、W2はアミノ基導入緩衝部材の重量である。また、「73」はジエチルアミンの分子量である。上記より、実施例1の緩衝部材が有するカチオン性官能基量は2.1mmol/gと算出された。
なお、カチオン性官能基としてジエチルアミン以外のモノマーを用いる場合には、(1)式でのカチオン性官能基量の計算には、「73」に替えてそのモノマーの分子量を使用すればよい。
振動膜は実施例1と同じものである。緩衝部材は、実施例1においてナイロン不織布への電子線の照射量を5Mradとした以外は実施例1と同様である。得られたGMA不織布(アミノ基導入前の緩衝部材)の重量増加率で定義されるグラフト率は60%、アミノ基導入緩衝部材のカチオン性官能基量は0.6mmol/gであった。
振動膜は、実施例1のポリエステルフィルムの代わりに、PVDFフィルム(クレハ製、厚さ4μm)を用いた以外は実施例1と同様の方法で作製した。
振動膜は実施例1と同じものを用いた。緩衝部材は、実施例1における電子線照射処理において、電子線照射量を30Mradとした。それ以外は実施例1と同様の操作により緩衝部材を得た。比較例2においてGMA不織布のグラフト率は198%、アミノ基導入緩衝部材のカチオン性官能基量は4.0mmol/gであった。
振動膜は実施例1と同じものを用いた。緩衝部材は、実施例1における電子線照射処理において、電子線照射量を2Mradとした。それ以外は実施例1と同様の操作により緩衝材を得た。比較例3において得られたGMA不織布のグラフト率は15%、アミノ基導入緩衝材のカチオン性官能基量は0.2mmol/gであった。
振動膜は実施例1と同じものを用いた。緩衝部材は、まず、ナイロン不織布(旭化成せんい製、目付100g/m2)を窒素雰囲気下で岩崎電気株式会社製、エレクトロカーテン型電子線照射装置、CB250/15/180L、を用い電子線を200kVの加速電圧で20Mrad照射した。ついで、この不織布を10%のメタクリル酸グリシジル溶液に浸漬し、グラフト重合反応を行い、重量増加率で定義されるグラフト率105%のナイロン製のGMAグラフト不織布を得た。さらに、10%のジエチルアミン水溶液にこの不織布を浸漬しアミノ基を導入し、カチオン性官能基量は2.6mmol/gの緩衝部材を得、振動膜は実施例1と同様とした。
振動膜は実施例1と同じものを用いた。緩衝部材は、実施例1で用いたナイロン不織布(旭化成せんい製、目付40g/m2)を、そのまま緩衝部材とした。
振動膜は実施例3と同じものを用いた。緩衝部材は、実施例3で用いたポリプロピレン不織布(旭化成せんい製、目付40g/m2)を、そのまま緩衝部材とした。
振動膜は実施例1と同じものを用いた。実施例6で用いたナイロン不織布(旭化成せんい製、目付100g/m2)を、そのまま緩衝部材とした。
JIS L 1096(フラジール形法)により緩衝部材の通気度を測定した。
あらかじめ、それぞれの振動膜及び緩衝部材を直流送風式除電器(春日電機製、KD−410)にて除電して、振動膜と緩衝部材の電荷量をほぼ0.0nCにした。その後、平面電極をSUS325のメッシュ板とし、図1に示すように平面電極間に実施例及び比較例それぞれの緩衝部材を設け、さらにその緩衝部材にそれぞれの振動膜を挟み込みスピーカを作製した。作製したスピーカの電極間に20Hzから10kHzの正弦波での電圧100Vを供給し周波数特性を評価をした。周波数の評価は、スピーカから25cmの距離に設置した騒音計(NL-20 リオン(株)製)にて測定した。
振動膜及び緩衝部材の電荷量の測定は、周波数特性評価用に作製したスピーカに100Hz及び1kHzの正弦波での電圧100Vを供給し、その後スピーカから振動膜を取り出し、春日電機株式会社製のクーロンメーター(NK-1001)を接続した静電電荷量測定器(ファラデーケージ型 KQ-1400)を用いて、それぞれの周波数における電荷量を測定した。
2 緩衝部材
3 振動膜
11 緩衝部材の基体
12a 無機微粒子
12b 高分子微粒子
13 シランモノマー
14 バインダー
15 フッ素系高分子層
16 振動膜の基体
Claims (7)
- 薄膜状部材からなる振動膜と、
前記振動膜に対向して配置される導電性の音響透過性を有する平面電極と、
前記振動膜と前記平面電極との間に配置され、前記振動膜との接触により前記振動膜を帯電させる緩衝部材と、を備え
前記緩衝部材は、少なくとも表面にカチオン性の官能基を有することを特徴とする静電型スピーカ。 - 前記緩衝部材のカチオン性官能基がアミノ基、アンモニウム基、スルホニウム基、ホスホニウム基のうちいずれか1種であることを特徴とする請求項1に記載の静電型スピーカ。
- 前記緩衝部材の単位質量当たりのカチオン性官能基量が0.5mmol/g以上3.0mmol/g以下であることを特徴とする請求項1または2に記載の静電型スピーカ。
- 前記緩衝部材の官能基導入方法が放射線グラフト重合法であることを特徴とする請求項1から3のいずれか1つに記載の静電型スピーカ。
- 前記緩衝部材の通気度が150cm3/cm2/sec以上400cm3/cm2/sec以下であることを特徴とする請求項1から4のいずれか1つに記載の静電型スピーカ。
- 前記緩衝部材の少なくとも前記振動膜に対向する表面には、無機微粒子または高分子微粒子と、バインダー成分及び/又はシランモノマーと、を含む薄膜が形成されることを特徴とする請求項1から5のいずれか1つに記載の静電型スピーカ。
- 前記振動膜は、少なくとも表面の一部にフッ素系高分子を含む層が形成されていること、を特徴とする請求項1から6のいずれか1つに記載の静電型スピーカ。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4851621A (ja) * | 1971-10-27 | 1973-07-20 | ||
JPS5089017A (ja) * | 1973-09-15 | 1975-07-17 | ||
JP2012065295A (ja) * | 2010-09-17 | 2012-03-29 | Nbc Meshtec Inc | スピーカー振動板用フィルム |
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JPS4851621A (ja) * | 1971-10-27 | 1973-07-20 | ||
JPS5089017A (ja) * | 1973-09-15 | 1975-07-17 | ||
JP2012065295A (ja) * | 2010-09-17 | 2012-03-29 | Nbc Meshtec Inc | スピーカー振動板用フィルム |
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