JPWO2019103015A1 - 圧電スピーカー形成用積層体 - Google Patents
圧電スピーカー形成用積層体 Download PDFInfo
- Publication number
- JPWO2019103015A1 JPWO2019103015A1 JP2019555322A JP2019555322A JPWO2019103015A1 JP WO2019103015 A1 JPWO2019103015 A1 JP WO2019103015A1 JP 2019555322 A JP2019555322 A JP 2019555322A JP 2019555322 A JP2019555322 A JP 2019555322A JP WO2019103015 A1 JPWO2019103015 A1 JP WO2019103015A1
- Authority
- JP
- Japan
- Prior art keywords
- layer
- piezoelectric film
- piezoelectric
- intervening layer
- adhesive surface
- 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
Links
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Images
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Abstract
Description
圧電フィルムと、粘着面と、前記圧電フィルムと前記粘着面との間に配置された多孔体層及び/又は樹脂層である介在層と、前記粘着面に接合した剥離層と、を備え、
前記圧電フィルムを平面視で観察したときに、前記圧電フィルムの少なくとも一部が前記粘着面と重複するように前記粘着面が配置され、
前記剥離層を除去した状態で前記粘着面を支持体に貼り付けることにより、前記圧電フィルム及び前記介在層を圧電スピーカー又はその一部として前記支持体に固定することが可能である、圧電スピーカー形成用積層体を提供する。
図1及び図2を用いて、第1実施形態に係る圧電スピーカー形成用積層体を説明する。圧電スピーカー形成用積層体10は、圧電フィルム35と、粘着面17と、介在層40と、剥離層20と、を備えている。また、積層体10は、粘着層51を備えており、粘着面17は、粘着層51の表面(主面)により形成されている。積層体10は、粘着層又は接着層52(以下、単に粘着層52と称することがある)をさらに備えている。圧電フィルム35は、圧電体30と、電極61と、電極62と、を含んでいる。剥離層20と、粘着層51と、介在層40と、粘着層52と、圧電フィルム35とは、この順に積層されている。
拘束度(N/m3)=弾性率(N/m2)×表面充填率÷厚さ(m)
以下、図5を用いて第2実施形態に係る圧電スピーカー形成用積層体110を説明する。以下では、第1実施形態と同様の部分については、説明を省略することがある。
剥離層20、第1粘着層51、介在層40、第2粘着層52及び圧電フィルム35がこの順に積層された積層体から剥離層20を除去し、第1粘着層51によって、固定された支持体80に貼り付けた。これにより、図3に示す構造を作製した。具体的には、支持体80として、厚さ5mmのステンレス平板(SUS平板)を用いた。第1粘着層51として、不織布の両面にアクリル系粘着剤を含侵させた、厚み0.16mmの粘着シート(両面テープ)を用いた。介在層40として、エチレンプロピレンゴムとブチルゴムとを含む混和物を約10倍の発泡倍率で発泡させた、厚さ3mmで独立気泡型の発泡体を用いた。第2粘着層52として、基材が不織布でありその基材の両面に無溶剤型のアクリル樹脂を含む粘着剤が塗布された、厚さ0.15mmの粘着シート(両面テープ)を用いた。圧電フィルム35として、両面に銅電極(ニッケルを含む)が蒸着されたポリフッ化ビニリデンフィルム(総厚み33μm)を用いた。実施例1の第1粘着層51、介在層40、第2粘着層52及び圧電フィルム35は、平面視で縦37.5mm×横37.5mmの寸法を有しており、平面視で輪郭が重複した非分割かつ非枠状の板状形状を有している(後述の実施例及び参考例でも同様である)。支持体80は、平面視で縦50mm×横50mmの寸法を有しており、第1粘着層51を全体的に覆っている。このようにして、図3に示す構成を有する実施例1のサンプルを作製した。
介在層40として、エチレンプロピレンゴムを含む混和物を約10倍の発泡倍率で発泡させた、厚さ3mmで半独立半連続気泡型の発泡体を用いた。この発泡体は、硫黄を含むものである。それ以外は、実施例1と同様にして、実施例2のサンプルを作製した。
実施例3では、介在層40として、実施例2の介在層40と同一材料かつ同一構造の、厚さ5mmの発泡体を用いた。それ以外は、実施例2と同様にして、実施例3のサンプルを作製した。
実施例4では、介在層40として、実施例2の介在層40と同一材料かつ同一構造の、厚さ10mmの発泡体を用いた。それ以外は、実施例2と同様にして、実施例4のサンプルを作製した。
実施例5では、介在層40として、実施例2の介在層40と同一材料かつ同一構造の、厚さ20mmの発泡体を用いた。それ以外は、実施例2と同様にして、実施例5のサンプルを作製した。
介在層40として、エチレンプロピレンゴムを含む混和物を約10倍の発泡倍率で発泡させた、厚さ20mmで半独立半連続気泡型の発泡体を用いた。この発泡体は、硫黄を含まないものであり、実施例2〜5の介在層40として用いた発泡体に比べて柔軟である。それ以外は、実施例1と同様にして、実施例6のサンプルを作製した。
介在層40として、エチレンプロピレンゴムを含む混和物を約20倍の発泡倍率で発泡させた、厚さ20mmで半独立半連続気泡型の発泡体を用いた。それ以外は、実施例1と同様にして、実施例7のサンプルを作製した。
介在層40として、金属多孔体を用いた。この金属多孔体は、材料がニッケルであり、孔径が0.9mmであり、厚みが2.0mmのものである。第2粘着層52として、実施例1の第1粘着層51と同じ粘着層を用いた。それ以外は、実施例1と同様にして、実施例8のサンプルを作製した。
実施例1の第1粘着層51及び第2粘着層52を省略し、圧電フィルム35と支持体80との間に介在層140のみを介在させた。介在層140として、アクリル系粘着剤によって構成された、厚さ3mmの基材レス粘着シートを用いた。それ以外は、実施例1と同様にして、図5の積層体110から剥離層20を剥がしたものを図3の支持体80に取り付けた構成を有する、実施例9のサンプルを作製した。
介在層40として、実施例9の介在層140と同じ介在層を用いた。それ以外は、実施例8と同様にして、実施例10のサンプルを作製した。
介在層40として、厚さ5mmのウレタンフォームを用いた。それ以外は、実施例8と同様にして、実施例11のサンプルを作製した。
介在層40として、厚さ10mmのウレタンフォームを用いた。このウレタンフォームは、実施例11の介在層40として用いたウレタンフォームに比べて孔径が小さいものである。それ以外は、実施例8と同様にして、実施例12のサンプルを作製した。
介在層40として、厚さ5mmで独立気泡型のアクリルニトリルブタジエンゴムの発泡体を用いた。それ以外は、実施例8と同様にして、実施例13のサンプルを作製した。
介在層40として、厚さ5mmで独立気泡型のエチレンプロピレンゴムの発泡体を用いた。それ以外は、実施例8と同様にして、実施例14のサンプルを作製した。
介在層40として、天然ゴムとスチレンブタジエンゴムとがブレンドされた厚さ5mmで独立気泡型の発泡体を用いた。それ以外は、実施例8と同様にして、実施例15のサンプルを作製した。
介在層40として、厚さ5mmで独立気泡型のシリコーンの発泡体を用いた。それ以外は、実施例8と同様にして、実施例16のサンプルを作製した。
介在層40として、実施例1の介在層40と同一材料かつ同一構造の、厚さ10mmの発泡体を用いた。第2粘着層52として、実施例1と同じ粘着シートを用いた。圧電フィルム35の圧電体30として、厚さ35μmのトウモロコシ由来のポリ乳酸を主原料とした樹脂シートを用いた。圧電フィルム35の第1電極61及び第2電極62は、それぞれ、厚さ0.1μmのアルミニウム膜であり、蒸着によって形成した。こうして、総厚みが35.2μmの圧電フィルム35を得た。それ以外は、実施例1と同様にして、実施例17のサンプルを作製した。
実施例1の圧電フィルム35を、参考例1のサンプルとした。参考例1では、地面に平行な台上に、接着せずにサンプルを置いた。
介在層の厚さは、厚みゲージを用いて測定した。
介在層から、小片を切り出した。切り出した小片に対して、引張試験機(TA Instruments社製「RSA−G2」)を用いて、常温で圧縮試験を行った。これにより、応力−ひずみ曲線を得た。応力−ひずみ曲線の初期傾きから、弾性率を算出した。
顕微鏡により、介在層の拡大画像を得た。この拡大画像を画像解析することにより、介在層の孔径の平均値を求めた。求めた平均値を、介在層の孔径とした。
介在層から直方体の小片を切り出した。切り出した小片の体積及び質量から見かけの密度を求めた。見かけの密度を、介在層を形成する母材(中実体)の密度で除した。これにより、充填率を算出した。さらに1から充填率を差し引いた。これにより、空孔率を得た。
実施例2〜16については、上述の充填率を表面充填率とした。実施例1及び17では、介在層は表面スキン層を有しているため、表面充填率は100%とした。
実施例1〜8及び10〜17のサンプルを測定するための構成を、図6に示す。圧電フィルム35の両面の角部に、厚さ70μmであり縦5mm×横70mmである導電性銅箔テープ70(3M社製のCU−35C)を取り付けた。また、これらの導電性銅箔テープ70のそれぞれに、みのむしクリップ75を取り付けた。導電性銅箔テープ70及びみのむしクリップ75は、圧電フィルム35に交流電圧を印加するための電気経路の一部を構成する。
・周波数範囲:100Hz〜100kHz
・スイープ時間:20秒
・実効電圧:10V
・出力波形:サイン波
・測定時間:22秒
・ピークホールド
・測定範囲:4Hz〜102.4kHz
・ライン数:6400
暗騒音よりも3dB以上音圧レベルが大きい周波数域(音圧レベルが暗騒音+3dB以上に保たれる周波数範囲がピーク周波数(音圧レベルがピークとなる周波数)の±10%に満たないような急峻なピーク部を除く)の下端を、音が出始める周波数と判断した。
図3に戻って本発明による圧電スピーカーの支持構造の一例を参照する。圧電スピーカー10では、圧電フィルム35の全面が粘着層51、52及び介在層40を介して支持体80に固定されている。
Claims (9)
- 圧電フィルムと、粘着面と、前記圧電フィルムと前記粘着面との間に配置された多孔体層及び/又は樹脂層である介在層と、前記粘着面に接合した剥離層と、を備え、
前記圧電フィルムを平面視で観察したときに、前記圧電フィルムの少なくとも一部が前記粘着面と重複するように前記粘着面が配置され、
前記剥離層を除去した状態で前記粘着面を支持体に貼り付けることにより、前記圧電フィルム及び前記介在層を圧電スピーカー又はその一部として前記支持体に固定することが可能である、圧電スピーカー形成用積層体。 - 前記圧電フィルムを平面視で観察したときに、前記圧電フィルムの面積の50%以上の領域において前記粘着面が配置されている、請求項1に記載の圧電スピーカー形成用積層体。
- 前記圧電フィルム、前記介在層及び前記剥離層は、それぞれ、厚さが実質的に一定である、請求項1又は2に記載の圧電スピーカー形成用積層体。
- 帯状体の形状を有し、
前記帯状体の長手方向に巻き込まれた巻回体の形態を有する、請求項3に記載の圧電スピーカー形成用積層体。 - 前記圧電フィルムの圧電体は、樹脂フィルムであり、
前記介在層は、圧電フィルムとしては機能しない樹脂層である、請求項1〜4のいずれか一項に記載の圧電スピーカー形成用積層体。 - 前記圧電スピーカー形成用積層体における前記剥離層とは反対側の主面の50%以上が、前記圧電フィルムによって構成されている、請求項1〜5のいずれか1項に記載の圧電スピーカー形成用積層体。
- 非圧縮状態における前記介在層の厚さは、0.1mm〜30mmの範囲にある、請求項1〜6のいずれか一項に記載の圧電スピーカー形成用積層体。
- 前記介在層は、エチレンプロピレンゴム発泡体層である、請求項1〜7のいずれか一項に記載の圧電スピーカー形成用積層体。
- 前記圧電フィルムと前記粘着面との間に存在する互いに隣接する層は接合されている、請求項1〜8のいずれか一項に記載の圧電スピーカー形成用積層体。
ここで、前記圧電フィルムと前記粘着面との間は、前記圧電フィルム及び前記粘着面を
含む。
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