1375945 九、發明說明： 【發明所屬之技術領域】 ' 本發明涉及一種發聲裝置，尤其涉及一種於液體介質 鲁 • 中工作之發聲裝置。 【先前技術】 發聲裝置一般由訊號輸入裝置與發聲元件組成。通過 訊號輸入裝置输入訊號給發聲元件，進而發出聲音。現有 之發聲元件種類很多，如電動式、電磁式、靜電式及壓電 籲式，它們大都採用振膜振動發出聲音，結構較為複雜。早 於二十世紀初，即有人提出了一種基於熱聲效應之熱致發 聲元件之構想，請參見文獻“ The Thermophone ” ， EDWARD C. WENTE，Vol.XIX，Νο·4，pp333-345 及 “On Some Thermal Effects of Electric Currents ” ，William Henry Preece, Proceedings of the Royal Society of London, Vol.30,（1879-1881)，pp408-411 °該熱致發聲元件通過向一 I金屬箔片或金屬絲中通入交流電來實現發聲。該金屬箔片 _或金屬絲須具有較小之熱容，較薄之厚度，且可將其内部 產生之熱量迅速傳導給周圍氣體介質之特點。當交流電通 • 過該金屬箔片或金屬絲時，隨交流電電流強度之變化，該 • 金屬箔片或金屬絲可迅速升降溫，並與周圍氣體介質迅速 發生熱交換，使該周圍氣體介質分子受熱運動並使該周圍 氣體介質產生密度變化，進而發出聲波。 H.D.Arnold與I.B.Crandall也介紹了一種簡單之熱致 發聲裝置，請參見 “The thermophone as a precision source 1375945 of sound- , η. D. Arnold, I. B. Crandall, Phys. Rev. 10, 38 (1917)明參見圖i，該文獻中介紹之發聲裝置loo 包括一用銘片製成之發聲元件1〇2，該翻片之厚度為〇7 微米。該發聲元件102通過一夾具1〇4固定，該發聲元件 池及夾具1〇4没置於一基體1〇8表面。一電流引線1〇6 與該發聲元件102電連接，用於向該發聲元件搬輸入電 訊號。由=發聲元件皿之發聲頻率與其單位面積熱容密 =相關。單位面積熱容大，則發聲頻率範圍窄，強度低； 單位面積熱容小，則發聲頻率範圍寬，強度高。欲獲得且 有較寬f聲頻率範圍及較高強度之聲波，則要求發 102之單位面積熱容愈小愈好。該發聲元件⑽使用具有 較小熱容之金屬|^，受材料本身之限制，其小。 能達到0.7微米，巾〇.7微米厚之鉑片之單位面積熱容； 小只能達到2乂1〇.4焦耳每平方釐米克爾文。由於受材料單 位面積，容之限制，該發聲元件1〇2之發聲頻率最高僅達 4千赫茲’且該發聲元件1〇2之發聲強度也不足以 直接感知。 綜上所述’該發聲元件1〇2之發聲強度低，人耳難以 直接感知’該發聲元件1〇2發聲頻率範圍窄且都係於空 氣中發聲’應用範圍比較窄，應用領域比較單一。 【發明内容】 有鑒於此，提供一種發聲頻率範圍寬，發聲強产譆人 耳能夠直接感知’且能夠於液態介f中發聲之發聲^ 达》、八® i貝 1375945 一種發聲裝置，其包括一訊號輸入裝置及一發聲元 件。該發聲元件與該訊號輸入裝置電連接。該發聲元件包 •括一奈米碳管結構，該奈米碳管結構至少一表面與一液態 質接觸。該訊號輸入裝置輸入訊號給該奈米碳管結構， 使該奈米碳管結構改變該液態介質之密度而發出聲波。 相較於先前技術，該發聲裝置中採用奈米碳管結構做 發聲元件，該奈米碳管結構熱容小且比表面積大，因此該 •發聲裝置有著足夠高之發聲強度與足夠寬之發聲頻率範 圍，能夠讓人耳直接感知，而且該發聲裝置中還能夠於液 態”質中發聲。拓展了採用“熱聲”效應之發聲裝置之應 用領域及範圍。 【實施方式】 以下將結合附圖詳細說明本發明實施例之於液態介質 工作之發聲裝置。 请參閱圖2，本發明第一實施例提供一種發聲裝置 鲁200，其包括一訊號輸入裝置，至少兩個電極220及一 發聲元件230。該至少兩個電極220間隔設置並與該發聲 元件230電連接’該訊號輸入裝置21〇經由該電極220與 該發聲元件230電連接。在工作時，該發聲元件23〇至少 • 一表面與一液態介質300相接觸，在本實施例中，該發聲 元件230浸沒於一液態介質3〇〇中。 該訊號輸入裝置210用於輸入音頻電訊號或交流電訊 號給該發聲元件230，該發聲元件230將該音頻電訊號或 父流電訊號轉變為熱能’通過加熱周圍液態介質3〇〇，並 1375945 改變該周圍液態介質300之密度而發出聲波β 該訊號輸入裝置210通過該電極220與該發聲元件 230電連接，在本實施例中，該電極22〇之數量為兩個， 分別為第一電極220a與第二電極22〇b。該第一電極22〇a 與第二電極220b分別設置於該發聲元件23〇之兩端，且該 第一電極220a與第二電極220b分別與該訊號輪入裝置 210之兩端電連接，從而形成一個訊號回路。另外，該第 一電極220a與第二電極220b還可支撐固定該發聲元件 230。該電極220之設置，可使該訊號輸入裝置21〇電連接 並輸入訊號給該發聲元件230。可以理解，該電極22〇之 具體結構與形式不限，如該訊號輸入装置21〇 導線與該發聲元件230電連接。 ° 該發聲元件230包括一奈米碳管結構，該奈米碳管結 構具有較大之比表面積，從而具有與液體介質接觸之較大 ，面積。該奈米碳管結構之單位面積熱容小於2xl〇-4焦耳 每平方釐米克爾文，優選地，該奈米碳管結構之單位面積 熱容小於1.7xl〇·6焦耳每平方釐米克爾文。 該奈米碳管結構包括至少一奈米碳管膜，至少一奈米 碳管線狀結構或奈米碳管膜與奈米碳管線狀結構-起形成 3合結構。該奈米碳管膜包括無序奈卡碳管膜與有序奈 米炭s膜。這裏之無序指該奈米碳管膜中之奈米碳管之排 列方向無規則；有序指該奈㈣管膜中至少多數奈米碳管 之㈣方向具# —定規律’如該多數奈米碳管通過凡德瓦 爾力首尾相連’或該多數奈米碳管基本沿一個固定方向擇 10 1375945 優取向排列或基本沿幾個固定方向擇優取向排列。 具體地，該奈米碳管膜包括奈米碳管絮化膜、奈米碳 管碾壓臈及奈米碳管拉膜。 〜該奈米碳管絮化膜通過對一奈米碳管陣列絮化處理而 獲得’該奈米碳管絮化膜中之奈米碳管相互纏繞或各向同 性排列。該奈米碳管絮化膜之結構及製備方法請參見范守 。等人於2007年4月13日申請，並於2008年1〇月 曰公開之第CN101284662A號大陸公開專利申請（申請 人.清華大學；鴻富錦精密工業（深圳）有限公司）。 請參閱圖3,該奈米碳管礙壓膜通過礙壓一奈米碳管 陣列而獲得，該奈米碳管礙壓膜可採用一平面壓頭沿垂直 於上述奈来碳管陣列生長之基底之方向擠壓上述奈米碳管 陣列而獲得。此時該奈米碳管礙壓膜中之奈来碳管各向同 性；該奈米碳管碾壓膜也可採用一滾軸狀壓頭沿某一固定 方向礙壓上述奈米碳管陣列而獲得，此時該奈米碳管礙壓 #膜中之奈米碳管於該固定方向擇優取向；該奈求碳管礙壓 膜還可採用滾轴狀壓頭沿不同方向礎壓上述奈米碳管陣列 而獲得，此時該奈米碳管碾壓膜中之奈米碳管沿不同方向 *擇優取向。該奈米碳管碾壓膜之結構及製備方:妹參見三 •守善等人於2007年6月1日申請，申請月號“ 200710074699.6號之大陸專利申請（申請人：清華大學 鴻富錦精密工業（深圳）有限公司）。 干’ 請參閱圖4,該奈米碳管拉膜通過採用一拉伸工具自 -奈米碳管陣列直接拉取而獲得，該奈米碳管拉膜為透明 11 明’且該奈求碳管拉膜中之 瓦爾力首尾相連，米碳管 T通過凡德 參見范守善等人於2_年2/9膜9之；1構及其製備方法請 公開之第CN1G1239712 ⑺’於霸年8月 人：清華大與m 就大陸公開專利Φ請（申請 實施例中；太2!?::業（_)有限公司)。在本 管-構由福：：ί“碳管拉膜，且該奈米碳 ;;:5二數重疊設置之奈米碳管拉膜組成，形成-個厚 =1 間之層狀結構，且相鄰之奈米碳管 拉膜中之奈米碳管之間具 度且小於等於90产。優.㈣二"大於等於0 太乎石山〜士心& 選地’备該夹角α為0度時，該 構包括層數較多之奈米碳管拉膜（如大於或等 置S冑该奈米碳管結構於保證發聲強度之同時，也 具〇備一定之機械性能’·當該爽角α大於〇度且小於或等於 ^ 該奈米奴管結構包括層數較少之奈米碳管拉膜 如J於16層）’這係因為當該相鄰之奈米碳管拉膜中之 奈米碳管之間具有一交又角度時，該奈米碳管相互交織形 成-網狀結構，使該奈米碳管結構之機械性能增加，可避 免該碳奈米結構從空氣放入液態介質3〇〇中時由於液態介 。〇〇之表面張力使奈米碳管膜收縮，從而可減少該；米 碳管拉膜之層數。本實施例中，該奈米碳管結構包括16 層相互重疊設置之奈米碳管拉膜’相鄰奈米碳管拉膜中之 奈米碳管之間具有90度夾角。 可以理解，該發聲裝置200採用透明或者半透明該奈 米碳管拉膜為發聲元件23〇，使該發聲裝置細能夠應用 到一些特殊場合，如光源之外表面。 碳管線狀結構包括至少一奈米碳管線，該奈米 ^ 複數首尾相連之奈米碳管。該奈米碳管線狀,士 構可為由複數Μ碳管線動Μ域之綠結構， 互扭轉組成之絞線結構。另外，該奈米碳管結構可由該太 米碳管線狀結構平行設置、相互纏繞或相互編織組成Γ' 該奈米碳管線通過對一有序奈米碳管膜進行有機溶劑 處理或機械力扭轉而獲得，該奈Μ管線包括複數通過凡 ，瓦爾力f尾相連之奈米碳管。該通過有機溶劑處理而獲 得之非扭轉之奈米碳管線包括複數沿奈米碳管線長度方向 排列並首尾相連之奈米碳管。該通過機械力扭轉而獲得之 扭轉之奈米碳管線包括複數繞奈米碳管線軸向螺旋排列之 奈米碳管。該奈来碳管線長度不限，直徑為G5奈米· 微米。該通過有機溶劑處理獲得之奈米碳管線及其製備方 法請參見范守善等人於2005年12月16日申請，於2〇〇7 年6月20日公開之第CN19822〇9A號大陸公開專利申請 (申請人··清華大學；鴻富錦精密工業（深圳）有限公司）。 該發聲裝置200於工作時，該發聲元件23〇全部浸沒 於液態介質300中。由於該碳奈米結構單位面積熱容小於 2xl(T4焦耳每平方釐米克爾文，當該發聲元件23〇接收到 該訊號輸入裝置210之訊號後，該發聲元件230中之奈米 碳管結構將電能轉換為熱能’並迅速與周圍之液態介質 300產生熱交換，使周圍之液態介質3〇〇改變密度。當該 訊滅輸入裝置210之訊號為週期變化之交流電訊號或經過 13 1375945 調製後之音頻電訊號時，該奈米碳管結構產生之熱能也會 同步發生變換，使該發聲元件230周圍之液態介質3〇〇之 密度也會產生變化，從而發出聲波。同時利用該液態介質 300良好之導熱性，對該發聲元件23〇所發出之熱量及時 散埶0 · 為保證該發聲元件230之電熱轉換效率，該液態介質 300之電阻率應大於2xl〇-2歐姆•米。優選地，該液態介 質300為非電解質溶液、純水、海水、淡水及有機溶劑中 之一種或任意組合。在本實施例中，該液態介質3〇〇為純 水。該純水不僅電導率達到1>5><1〇7歐姆•米，且該純水 之比熱容也較大，可迅速吸收奈米碳管結構表面之熱量， 對該奈米碳管結構進行快速散熱。 請參閱圖5，為該發聲裝置2〇〇於純水水面下〇 lcm 之深度時分別加40 V、50 V及60 V電壓得到之頻率回應 特性曲線’該發聲裝置200之發聲元件23〇採用16層同向 重疊設置之奈米碳管拉膜所製成。於靠近該水面之地方設 置一麥克風用於測試該發聲裝置2〇〇自該水面下發出之聲 波。從圖5可看出，該發聲元件23〇之發聲強度超過6〇 分貝每瓦聲壓級，最高可達95分貝每瓦聲壓級；該發聲元 件230之發聲頻率範圍為1赫茲至10萬赫茲以上。因此該 發聲裝置200具有較高之發聲強度，且頻率範圍比較寬， 有著非常理想之發聲效果。 請參閱圖6,本技術方案第二實施例提供一種發聲裝 置400 ’該發聲裝置4〇〇包括訊號輸入襄置，電極42〇 14 1375945 及發聲元件430。 本實施例中之發聲裝置400與第一實施例中之發聲裝 置200之結構基本相同，其主要區別在於，本實施例中之 發聲裝置400包括四個棒狀電極420，即第一電極420a， 苐二電極420b，第三電極420c及第四電極420d。該第一 電極420a，第二電極420b，第三電極420c及第四電極420d 空間平行間隔設置。該發聲元件430環繞該第一電極 420a，第二電極420b，第三電極420c及第四電極420d設 • 置，並與該第一電極420a，第二電極420b，第三電極420c 及第四電極420d分別電連接，形成一環形發聲元件430。 任意兩個相鄰之電極均分別與該訊號輸入裝置410之兩端 電連接，以使位於相鄰電極之間之發聲元件430接入輸入 訊號。具體地，先將不相鄰之兩個電極電連接後與該訊號 輸入裝置410之一端電連接，剩下之兩個電極電連接後與 該訊號輸入裝置410之另一端電連接。本實施例中，可先 $將該第一電極420a及第三電極420c電連接後與該訊號輸 入裝置410之一端電連接，再將該第二電極420b及第四電 極420d電連接後與該訊號輸入裝置410之另一端電連接。 上述連接方式可實現相鄰電極之間之奈米碳管結構之並 聯。並聯後之奈米碳管結構具有較小之電阻，可降低工作 電壓。且，上述連接方式可使該發聲元件430具有較大之 輻射面積，且發聲強度得到增強，可實現環繞發聲效果。 另外，當該發聲元件430之面積較大時，該第三電極420c 及第四電極420d也可進一步起到支撐該發聲元件430之作 15 1375945 用。 該第一電極420a，第二電極420b，第三電極420c及 . 第四電極420d也可與該發聲元件430設置於同一平面内。 • 該設置於同一平面内之各電極之連接方式與上述電極之連 接方式相同或相似。可以理解，本實施例可設置複數電極， 其數量不限，只需確保任意兩個相鄰之電極420均分別與 該訊號輸入裝置410之兩端電連接即可。 請參閱圖7,本技術方案第三實施例提供一種發聲裝 鲁置500,該發聲裝置500包括一訊號輸入裝置510,兩個電 極520，分別為第一電極520a及第二電極520b，及一發聲 元件530。 本實施例提供之發聲裝置500與第一實施例之發聲裝 置200結構基本相同，其主要區別在於，本實施例中之發 聲裝置500進一步包括一支撐結構540。該發聲元件530 至少部分設置於該支撐結構540之表面。 I 該支撐結構540可由硬性材料，如金剛石、玻璃或石 英製成；也可由柔性材料，如塑膠或樹脂製成。優選地， 該支撐結構540之材料應具有較好之絕熱性能，從而防止 該發聲元件530產生之熱量被該支撐結構540吸收，無法 - 達到加熱周圍液態介質進而發聲之目的。 該支撐結構540用於支撐該發聲元件530，任何具有 確定形狀之物體，均可作為本實施例中之支撐結構540。 具體地，該支撐結構540可為一平面結構或一曲面結構， 並具有一表面。此時，該發聲元件530直接設置並貼合於 16 1375945 該支撐結構540之表面。由於該發聲元件530整體通過支 撐結構540支撐，因此該發聲元件530可承受強度較高之 ' 訊號輸入，從而具有較高之發聲強度。另外，由於發聲元 件530設置於支撐結構540表面，故將該奈米碳管結構放 入該液態介質令時，該支撐結構可起到保護奈米碳管結構 不被破壞或改變之作用。 該支撐結構540也可為一立體結構，如一立方體、一 圓錐體或一圓柱體。此時，該發聲元件530可環繞該支撐 •結構540設置，形成一環形發聲元件530。該發聲元件530 也可部分設置於該支撐結構540表面，從而於該發聲元件 530表面至支撐結構540之間形成一攏音空間。所形成之 攏音空間可為一封閉空間或一開放空間。該支撐結構540 可為一 V型、U型結構或一具有狹窄開口之腔體。當該支 撐結構540為一具有狹窄開口之腔體時，該發聲元件530 可平鋪固定設置於該腔體之開口上，從而形成一亥姆霍茲 I共振腔。當該支撐結構540為一 V型結構時，該發聲元件 530設置於該V型結構之兩端，即從V型結構之一端延伸 至另一端，使該發聲元件530部分懸空設置，從而於該發 • 聲元件530表面至支撐結構540之間形成一攏音空間。該 第一電極520a與第二電極520b間隔設置於該發聲元件 530表面。該第一電極520a與第二電極520b與該訊號輸 入裝置510之兩端電連接。該V型支撐結構540可反射該 發聲元件530位於該支撐結構540 —側之聲波，增強該發 聲裝置500之發聲效果。 17 137-5945 在本實施例中’該支撐結構540為一平面結構，該發 聲元件530貼合設置於該支撐結構540表面。 該發聲裝置中採用奈米碳管結構做發聲元件，該奈米 碳官結構熱容小且比表面積大，因此該發聲裝置有著足夠 高之發聲強度與足夠寬之發聲頻率範圍，能夠讓人耳直接 感知，而且該發聲裝置中還能夠於液態介質中發聲。拓展 了採用“熱聲”效應之發聲裝置之應用領域及範圍。 綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施例， 自不能以此限制本案之申請專利範圍。舉凡習知本案技藝 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 蓋於以下申請專利範圍内。 〜 【圖式簡單說明】 圖1係先前技術中發聲裝置之結構示意圖。 圖2係本發明第一實施例發聲裝置之結構示意圖。 圖3係本發明第一實施例作為發聲元件之擇優取向夺 米碳管碾壓膜之掃描電鏡照片。 ，、 圖4係本發明第一實施例作為發聲元件之奈米碳管 膜之掃描電鏡照片。 線。圖5係本發實關發衫置之頻率響應特性曲 圖6係本發明第二實施例發聲装置之結構示意圖。 圖7係本發明第三實施例發聲裝置之結構示意圖。 【主要元件符號說明】 18 1375945 發 聲 裝 置 100、 200 ' 400、 500 發 聲 元 件 102、 230、 430、 530 夾 具 104 電 流 引線 106 基 體 108 訊 號 4^ m 入裝置 210、 410 ' 510 電 極 220、 420 ' 520 第 一 電 極 220a > 420a ' 520a 第 二 電 極 220b ' 420b 、520b 液 態 介 質 300 第 二 電 極 420c 第 四 電 極 420d 支 撐 結 構 540 191375945 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a sounding device, and more particularly to a sounding device that operates in a liquid medium. [Prior Art] The sounding device is generally composed of a signal input device and a sounding element. The signal is input to the sounding component through the signal input device, and then the sound is emitted. There are many types of sound-emitting components, such as electric, electromagnetic, electrostatic, and piezoelectric, and most of them use diaphragm vibration to emit sound, and the structure is complicated. As early as the beginning of the twentieth century, the idea of a thermoacoustic component based on thermoacoustic effects was proposed, see the document "The Thermophone", EDWARD C. WENTE, Vol.XIX, Νο·4, pp333-345 and " On Some Thermal Effects of Electric Currents ” , William Henry Preece, Proceedings of the Royal Society of London, Vol. 30, (1879-1881), pp 408-411 ° The thermoacoustic element passes through a metal foil or wire In the middle of the exchange of alternating current to achieve sound. The metal foil _ or wire must have a small heat capacity, a thin thickness, and can quickly transfer the heat generated inside it to the surrounding gaseous medium. When the AC wire passes through the metal foil or wire, the metal foil or wire can rapidly rise and fall with the change of the alternating current intensity, and rapidly exchange heat with the surrounding gas medium to make the surrounding gas medium molecule. The heat is moved and the ambient gas medium is subjected to a density change, which in turn emits sound waves. HDArnold and IBCrandall also introduced a simple thermal sounding device, see "The thermophone as a precision source 1375945 of sound- , η. D. Arnold, IB Crandall, Phys. Rev. 10, 38 (1917) Referring to Figure i, the sounding device loo described in the document comprises a sounding element 1 2 made of a slab having a thickness of 〇 7 μm. The sounding element 102 is fixed by a clamp 1 〇 4, the sounding The component cell and the clamp 1〇4 are not placed on the surface of a substrate 1〇8. A current lead 1〇6 is electrically connected to the sound emitting element 102 for inputting a signal to the sounding element. The sounding frequency of the sounding component is It is related to the heat capacity density per unit area. The heat capacity per unit area is large, the sound frequency range is narrow, and the intensity is low. The heat capacity per unit area is small, the sound frequency range is wide, and the intensity is high. To obtain and have a wide f sound frequency range and For higher-intensity sound waves, it is required that the heat capacity per unit area of the hair 102 is as small as possible. The sound-emitting element (10) uses a metal having a small heat capacity, which is limited by the material itself, and can be as small as 0.7 micron. 〇.7 microns thick The heat capacity per unit area of the film; the small can only reach 2乂1〇.4 joules per square centimeter Kelvin. Due to the limitation of the unit area of the material, the sounding frequency of the sounding element 1〇2 is only up to 4 kHz' Moreover, the sound intensity of the sounding element 1〇2 is not sufficient to directly sense. In summary, the sounding intensity of the sounding element 1〇2 is low, and it is difficult for the human ear to directly perceive the sounding element 1〇2 to have a narrow sound frequency range and both In the air, the application range is relatively narrow, and the application field is relatively simple. [Invention] In view of the above, a wide range of sound frequencies is provided, and the sound is strong and the human ear can directly sense 'and can sound in the liquid medium f Sounding device </ br>, 八® i 贝 1375945 A sounding device comprising a signal input device and a sounding component. The sounding component is electrically connected to the signal input device. The sounding component package comprises a carbon nanotube structure, At least one surface of the carbon nanotube structure is in contact with a liquid material. The signal input device inputs a signal to the carbon nanotube structure, so that the carbon nanotube structure changes the density of the liquid medium. Compared with the prior art, the sound generating device adopts a carbon nanotube structure as a sounding element, and the carbon nanotube structure has a small heat capacity and a large specific surface area, so the sounding device has a high sound intensity and A wide enough range of audible frequencies can be directly perceived by the ear, and the sounding device can also sound in the liquid state. Expanded the application field and scope of the sounding device using the "hot sound" effect. [Embodiment] Hereinafter, a sound generating device for operating a liquid medium according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 2, a first embodiment of the present invention provides a sounding device 200 including a signal input device, at least two electrodes 220, and a sounding element 230. The at least two electrodes 220 are spaced apart and electrically coupled to the sound emitting element 230. The signal input device 21 is electrically coupled to the sound emitting element 230 via the electrode 220. In operation, the sound producing element 23 has at least one surface in contact with a liquid medium 300. In the present embodiment, the sounding element 230 is immersed in a liquid medium. The signal input device 210 is configured to input an audio signal or an alternating current signal to the sounding component 230, and the sounding component 230 converts the audio signal or the parent electrical signal into heat energy by heating the surrounding liquid medium 3〇〇 and changing 1375945 The sound of the surrounding liquid medium 300 emits an acoustic wave β. The signal input device 210 is electrically connected to the sound emitting element 230 through the electrode 220. In this embodiment, the number of the electrodes 22 is two, respectively being the first electrode 220a. And the second electrode 22〇b. The first electrode 22A and the second electrode 220b are respectively disposed at two ends of the sounding element 23, and the first electrode 220a and the second electrode 220b are respectively electrically connected to both ends of the signal wheeling device 210, thereby Form a signal loop. In addition, the first electrode 220a and the second electrode 220b can also support and fix the sound emitting element 230. The electrode 220 is disposed to electrically connect the signal input device 21 and input a signal to the sound emitting element 230. It can be understood that the specific structure and form of the electrode 22 is not limited, for example, the signal input device 21 is electrically connected to the sound emitting element 230. ° The sound producing element 230 includes a carbon nanotube structure having a large specific surface area to have a large area in contact with the liquid medium. The carbon nanotube structure has a heat capacity per unit area of less than 2 x 1 〇 - 4 joules per square centimeter of Kelvin. Preferably, the carbon nanotube structure has a heat capacity per unit area of less than 1.7 x 1 〇 6 joules per square centimeter of Kelvin. The carbon nanotube structure comprises at least one carbon nanotube film, and at least one nano carbon line structure or a carbon nanotube film forms a triple structure with the nano carbon line structure. The carbon nanotube membrane comprises a disordered nika carbon nanotube membrane and an ordered nanocarbon s membrane. The disorder here means that the arrangement direction of the carbon nanotubes in the carbon nanotube film is irregular; the order refers to the (four) direction of at least most of the carbon nanotubes in the naphthalene film. The carbon nanotubes are connected end to end by van der Waals force or the majority of the carbon nanotubes are arranged in a fixed orientation along a fixed orientation of 10 1375945 or in a preferred orientation along several fixed directions. Specifically, the carbon nanotube membrane comprises a carbon nanotube flocculation membrane, a carbon nanotube compaction crucible, and a carbon nanotube membrane. ~ The carbon nanotube flocculation membrane is obtained by flocculation of a carbon nanotube array to obtain the carbon nanotubes in the carbon nanotube flocculation membrane intertwined or isotropically aligned. Please refer to Fan Shou for the structure and preparation method of the carbon nanotube flocculation membrane. Et al., filed on April 13, 2007, and published in the first quarter of 2008, CN101284662A, the mainland open patent application (applicant. Tsinghua University; Hongfujin Precision Industry (Shenzhen) Co., Ltd.). Referring to FIG. 3, the nano-carbon tube barrier film is obtained by obstructing an array of carbon nanotubes, and the nano-carbon tube film can be grown perpendicular to the array of carbon nanotubes by using a planar indenter. Obtained by extruding the above-described carbon nanotube array in the direction of the substrate. At this time, the carbon nanotubes in the nano-carbon tube are isotropic; the carbon nanotube rolled film can also use a roller-shaped indenter to block the carbon nanotube array in a certain fixed direction. Obtaining, at this time, the carbon nanotubes in the film may be preferentially oriented in the fixed direction; the carbon nanotubes may also adopt a roller-shaped indenter to press the above-mentioned nevron in different directions. The carbon nanotube array is obtained, and the carbon nanotubes in the carbon nanotube rolled film are preferentially oriented in different directions*. The structure and preparation of the carbon nanotube film is as follows: Sanshou Shoushan et al. applied for the mainland patent application on June 1, 2007, applying for the monthly patent application “200710074699.6 (Applicant: Tsinghua University Hongfujin Precision Industry (Shenzhen) Co., Ltd.) Dry 'Please refer to Figure 4, the carbon nanotube film is obtained by directly pulling from a carbon nanotube array using a stretching tool. The carbon nanotube film is Transparent 11 Ming' and the Vale in the carbon tube film is connected end to end, the carbon tube T through the van der See Fan Shoushan and others in the 2nd year 2 / 9 film 9; 1 structure and its preparation method please disclose CN1G1239712 (7) 'In August of the year of the Hegemony: Tsinghua University and m on the mainland open patent Φ please (in the application example; too 2!?:: industry (_) Ltd.). In this tube - structure by Fu:: “"Carbon tube film, and the nano carbon;;: 5 binary overlap set of carbon nanotube film formed, forming a layer thickness of 1 = 1, and adjacent carbon nanotubes The carbon nanotubes in the film are between 90 degrees and less than or equal to 90%. Excellent. (4) Two "greater than or equal to 0 too Stone Mountain ~ Shixin & Site selection 'When the angle α is 0 degrees, the structure includes a number of layers of carbon nanotube film (such as greater than or equal to S胄 The carbon nanotube structure also has certain mechanical properties while ensuring the sound intensity. · When the refresh angle α is greater than the twist and less than or equal to ^ The nanotube structure includes a small number of layers. The carbon nanotube film is J (16 layers). This is because when the carbon nanotubes in the adjacent carbon nanotube film have an angle and an angle between the carbon nanotubes, the carbon nanotubes are interwoven. The mesh structure increases the mechanical properties of the carbon nanotube structure, and the liquid carbon structure can be avoided when it is placed in the liquid medium from the air. The surface tension of the crucible shrinks the carbon nanotube film, thereby reducing the number of layers of the carbon nanotube film. In this embodiment, the carbon nanotube structure comprises 16 layers of carbon nanotube film which are arranged to overlap each other. The carbon nanotubes in the adjacent carbon nanotube film have an angle of 90 degrees. It can be understood that the sounding device 200 adopts a transparent or translucent carbon nanotube film as the sounding element 23, so that the sounding device can be applied to some special occasions such as the outer surface of the light source. The carbon line-like structure includes at least one nano carbon line, and the nanometer is a plurality of carbon nanotubes connected end to end. The nanocarbon is in the form of a pipeline, and the structure can be a stranded structure composed of a green structure of a plurality of carbon-carbon pipelines and a mutual twist. In addition, the carbon nanotube structure may be formed by parallel arrangement of the carbon nanotube-like structures, intertwined or interwoven. The nanocarbon pipeline is subjected to organic solvent treatment or mechanical force twisting on an ordered carbon nanotube membrane. Obtained, the naphtha pipeline includes a plurality of carbon nanotubes connected by a vantage force. The non-twisted nanocarbon pipeline obtained by the organic solvent treatment comprises a plurality of carbon nanotubes arranged along the length of the nanocarbon pipeline and connected end to end. The twisted nanocarbon pipeline obtained by mechanical force torsion comprises a plurality of carbon nanotubes arranged in an axial spiral arrangement around the carbon nanotubes. The Nylon carbon line is not limited in length and has a diameter of G5 nanometers. The nano carbon pipeline obtained by the organic solvent treatment and the preparation method thereof can be found in the application for publication of the Chinese Patent Application No. CN19822〇9A published by Fan Shoushan et al. on December 16, 2005, published on June 20, 2007. (Applicant··Tsinghua University; Hongfujin Precision Industry (Shenzhen) Co., Ltd.). When the sounding device 200 is in operation, the sounding element 23 is entirely immersed in the liquid medium 300. Since the heat capacity per unit area of the carbon nanostructure is less than 2xl (T4 joules per square centimeter Kelvin), when the sounding element 23 receives the signal from the signal input device 210, the carbon nanotube structure in the sounding element 230 will The electrical energy is converted into thermal energy' and rapidly exchanges heat with the surrounding liquid medium 300, so that the surrounding liquid medium changes its density. When the signal of the signal input device 210 is periodically changed, the alternating current signal is modulated by 13 1375945. In the audio signal, the thermal energy generated by the carbon nanotube structure is also synchronously changed, so that the density of the liquid medium 3 around the sounding element 230 is also changed, thereby generating sound waves. At the same time, the liquid medium 300 is good. The thermal conductivity of the sound generating element 23 is dissipated in time. To ensure the electrothermal conversion efficiency of the sound generating element 230, the resistivity of the liquid medium 300 should be greater than 2 x 1 〇 -2 ohm·m. Preferably, The liquid medium 300 is one or any combination of a non-electrolyte solution, pure water, sea water, fresh water, and an organic solvent. In the present embodiment, the liquid state The medium 3〇〇 is pure water. The pure water not only has a conductivity of 1>5><1〇7 ohm·m, and the specific heat capacity of the pure water is also large, and the heat of the surface of the carbon nanotube structure can be quickly absorbed. The carbon nanotube structure is rapidly dissipated. Please refer to Fig. 5 for the frequency response characteristic curve obtained by adding 40 V, 50 V and 60 V voltages to the depth of the pure water surface at a depth of 1 cm. The sound producing element 23 of the sounding device 200 is made of 16 layers of carbon nanotube film which are arranged in the same direction and overlapped. A microphone is arranged near the water surface for testing the sounding device 2 from the surface of the water. The sound wave emitted. As can be seen from Fig. 5, the sound intensity of the sound emitting element 23 exceeds 6 〇 decibels per watt sound pressure level, up to 95 decibels per watt sound pressure level; the sounding element 230 has a sound frequency range of 1 Hz to 100,000 Hz or more. Therefore, the sounding device 200 has a high vocal intensity and a wide frequency range, and has a very good vocal effect. Referring to FIG. 6, the second embodiment of the present invention provides a sounding device 400'. Sounding device 4〇〇 includes a signal input device, an electrode 42〇14 1375945 and a sounding element 430. The sounding device 400 in this embodiment is basically the same as the sounding device 200 in the first embodiment, and the main difference is that the embodiment The sounding device 400 includes four rod electrodes 420, namely, a first electrode 420a, a second electrode 420b, a third electrode 420c, and a fourth electrode 420d. The first electrode 420a, the second electrode 420b, and the third electrode 420c The fourth electrode 420d is disposed in parallel with the space. The sounding element 430 surrounds the first electrode 420a, the second electrode 420b, the third electrode 420c and the fourth electrode 420d, and the first electrode 420a and the second electrode 420b. The third electrode 420c and the fourth electrode 420d are electrically connected to each other to form an annular sounding element 430. Any two adjacent electrodes are electrically connected to both ends of the signal input device 410, respectively, so that the sounding element 430 located between adjacent electrodes is connected to the input signal. Specifically, the two adjacent electrodes are electrically connected and electrically connected to one end of the signal input device 410, and the remaining two electrodes are electrically connected and electrically connected to the other end of the signal input device 410. In this embodiment, the first electrode 420a and the third electrode 420c are electrically connected to each other, and then electrically connected to one end of the signal input device 410, and then electrically connected to the second electrode 420b and the fourth electrode 420d. The other end of the signal input device 410 is electrically connected. The above connection method can realize the parallel connection of the carbon nanotube structures between adjacent electrodes. The carbon nanotube structure after parallel connection has a small resistance to reduce the operating voltage. Moreover, the above connection method enables the sound emitting element 430 to have a large radiation area, and the sounding intensity is enhanced, and the surrounding sounding effect can be realized. In addition, when the area of the sound emitting element 430 is large, the third electrode 420c and the fourth electrode 420d can further serve to support the sounding element 430 for use in 15 1375945. The first electrode 420a, the second electrode 420b, the third electrode 420c, and the fourth electrode 420d may be disposed in the same plane as the sound emitting element 430. • The electrodes connected in the same plane are connected in the same or similar way to the above electrodes. It can be understood that the present embodiment can be provided with a plurality of electrodes, the number of which is not limited, and it is only necessary to ensure that any two adjacent electrodes 420 are electrically connected to both ends of the signal input device 410, respectively. Referring to FIG. 7, a third embodiment of the present invention provides a sounding device 500. The sounding device 500 includes a signal input device 510, and two electrodes 520, which are a first electrode 520a and a second electrode 520b, respectively. Sounding element 530. The sound emitting device 500 provided in this embodiment has substantially the same structure as the sound emitting device 200 of the first embodiment, and the main difference is that the sound generating device 500 in the embodiment further includes a supporting structure 540. The sounding element 530 is at least partially disposed on a surface of the support structure 540. I The support structure 540 may be made of a hard material such as diamond, glass or quartz; or may be made of a flexible material such as plastic or resin. Preferably, the material of the support structure 540 should have better thermal insulation properties, so that the heat generated by the sound generating element 530 is prevented from being absorbed by the support structure 540, and the purpose of heating the surrounding liquid medium to sound is not achieved. The support structure 540 is for supporting the sound emitting element 530, and any object having a certain shape can be used as the support structure 540 in this embodiment. Specifically, the support structure 540 can be a planar structure or a curved structure and has a surface. At this time, the sounding element 530 is directly disposed and attached to the surface of the support structure 540 of 16 1375945. Since the sounding element 530 is integrally supported by the support structure 540, the sounding element 530 can withstand a higher intensity 'signal input, thereby having a higher vocal intensity. In addition, since the sounding element 530 is disposed on the surface of the support structure 540, when the carbon nanotube structure is placed in the liquid medium, the support structure can protect the carbon nanotube structure from being damaged or changed. The support structure 540 can also be a three-dimensional structure such as a cube, a cone or a cylinder. At this point, the sounding element 530 can be disposed about the support structure 540 to form an annular sounding element 530. The sounding element 530 can also be partially disposed on the surface of the support structure 540 to form a sound-sounding space between the surface of the sound-emitting element 530 and the support structure 540. The resulting sounding space can be a closed space or an open space. The support structure 540 can be a V-shaped, U-shaped structure or a cavity having a narrow opening. When the supporting structure 540 is a cavity having a narrow opening, the sounding element 530 can be tiled and fixed on the opening of the cavity to form a Helmholtz I resonant cavity. When the supporting structure 540 is a V-shaped structure, the sounding element 530 is disposed at two ends of the V-shaped structure, that is, extending from one end of the V-shaped structure to the other end, so that the sound-emitting element 530 is partially suspended, thereby A sounding space is formed between the surface of the acoustic element 530 and the support structure 540. The first electrode 520a and the second electrode 520b are spaced apart from each other on the surface of the sound emitting element 530. The first electrode 520a and the second electrode 520b are electrically connected to both ends of the signal input device 510. The V-shaped support structure 540 can reflect the sound waves of the sound-emitting element 530 on the side of the support structure 540 to enhance the sounding effect of the sound-emitting device 500. 17 137-5945 In the present embodiment, the supporting structure 540 is a planar structure, and the sounding element 530 is disposed on the surface of the supporting structure 540. The sound generating device adopts a carbon nanotube structure as a sounding element, and the nano carbon official structure has a small heat capacity and a large specific surface area, so the sounding device has a sound intensity of sufficiently high and a wide range of sounding frequencies, which can make an ear Directly perceived, and the sounding device is also capable of sounding in a liquid medium. Expanded the application field and scope of the sounding device using the "hot sound" effect. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. ~ [Simple description of the drawing] Fig. 1 is a schematic structural view of a sounding device in the prior art. 2 is a schematic structural view of a sounding device according to a first embodiment of the present invention. Fig. 3 is a scanning electron micrograph of a preferred embodiment of the present invention as a sound-emitting element of a carbon nanotube film. Fig. 4 is a scanning electron micrograph of a carbon nanotube film as a sounding element of the first embodiment of the present invention. line. Fig. 5 is a diagram showing the frequency response characteristic of the present invention. Fig. 6 is a schematic view showing the structure of the sounding device of the second embodiment of the present invention. Fig. 7 is a schematic structural view of a sound generating device according to a third embodiment of the present invention. [Main component symbol description] 18 1375945 Sounding device 100, 200 '400, 500 sounding element 102, 230, 430, 530 Fixture 104 Current lead 106 Base 108 Signal 4^ m Into device 210, 410 ' 510 Electrode 220, 420 ' 520 First electrode 220a > 420a ' 520a second electrode 220b ' 420b , 520b liquid medium 300 second electrode 420c fourth electrode 420d support structure 540 19