498696 A7 --B7 五、發明說明（1 ) 〔發明之詳細說明〕 〔發明所屬的技術領域〕 (請先閱讀背面之注意事項再填寫本頁) 本發明有關電子音響機器、通信機器、電子機器所使 用的壓電發聲體及其製造方法。 〔背景技術〕 經濟部智慧財產局員工消費合作社印製 壓電發聲體係廣泛被利用爲簡易的電氣音響變換裝置 ’而尤其近年來多用在行動電話等領域。如第7圖（A) 之斷面所示，一般作成爲將壓電驅動板1 〇 〇貼在金屬振 動板1 1 0的構成。壓電材可用例如，壓電性陶瓷{以銷 酸鈦酸鉛（簡稱P Z T )，鈦酸鋇、锆酸鉛、鈦酸鉛等爲 主成份的陶瓷}。將如此壓電材例如形成爲圓板狀並進行 燒成’極化以製得壓電驅動板1 〇 〇。在壓電驅動板 1〇0之上面（或者在表面、背面）設置有驅動用之電極 1〇2。另一方面，形成金屬振動板1 1 〇的金屬可用例 如F e - N i系不銹鋼材料。藉由將前述壓電驅動板 1〇0在金屬振動板1 1 〇上使用導電性粘著劑予以貼合 ，而可製得壓電發聲體（或者壓電擴音器、壓電蜂音器。 在如此所得壓電發聲體1 2 0上，於電極1 〇 2與金 屬振動板1 1 0之間，換言之，於壓電驅動板1 0 0之表 面背面將施加驅動信號1 2 2。金屬振動板1 1 〇側通常 予以接地。如按此方式，對壓電驅動板1 〇 0給予電位移 ，則壓電驅動板1 0 0將如第7圖（B )中以箭頭F A所 示，往圓周方向伸縮。惟由於金屬振動板1 1 0，之存在 -4- 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 經濟部智慧財產局員工消費合作社印製 498696 A7 B7 五、發明說明（2 ) 而全體開始彎曲，結果，如箭頭F B所示在上下方向振動 而產生聲音。 〔發明擬解決的課題〕 壓電發聲體之聲壓（sound pressure)特性，將成爲例 如第8圖中以圖表GA所示者。該圖中，f 〇爲共振（ resonance)頻率。又，f L爲聲壓低的頻率。此聲壓特性較 佳爲在人的可聽範圍，例如在3 0 OH z至3 kH z之範 圍爲平坦者。另一方面，由於在共振頻率附近聲壓將極端 變大之故，再生音對人類將成爲不自然。如增大金屬振動 板之直徑，共振頻率將低下。但，在此方法，壓電發聲體 之形狀將變大。又，藉由使壓電發聲體之厚度變小，亦可 降低共振頻率。然而，此方法在構造強度上當然有其界限 〇 於是，爲避免前述的不合適事宜的方法，有在日本專 利平7 6 - 7 8 3 9 7號公報所揭示的壓電發聲體。在此 方法中，於壓電振動板上設置使用金屬或陶瓷的共振抑制 構件。由此，可抑制因壓電振動板之共振作用的聲壓級（ level )之變動。據此方法，如第8圖中的曲線G B所示， 共振頻率將移位至低區域側之同時，聲壓亦將被抑制。惟 在此背景技術中有呈現聲壓級極端下降的頻率f L的不合 宜現象。此乃可能在壓電發聲體中發生高次之振動之故。 本發明係著眼於以上之問題者，以提供不致降低音® 而可得良好音質的壓電發聲體及其製造方法爲目的° 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -5- --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 498696 A7 _ B7 五、發明說明（3 ) 〔解決課題的方法〕 爲達成前述目的’第一，本發明提供一種壓電發聲體 ’係將箱體所支撐的振動板與由形成有電極的壓電材而成 的驅動板粘貼在一起的壓電發聲體，而前述驅動板或振動 板具備有可增大振幅且降低共振頻率的振動調整部。 藉由調整振幅及共振頻率的振動調整部之設立而不致 降低音量之下能獲得良好的音質。 其振動調整部，具體上，可採用下述方法。 (1 )構成爲在驅動板之壓電體內部所形成的電場肯g 引起較單層而使電極對抗的情形之電場爲高的電場之方式 ，且作成爲較假定驅動板及振動板之外徑比（驅動板之夕f 徑/振動板之外徑）爲0 · 7的情形之該驅動板與振動板 之質量比（驅動板之質量/振動板之質量（爲大。 (2 )構成爲在驅動板之壓電體內部所形成的電場肯g 引起較單層而使電極對抗的情形之電場爲高的電場之方式 ，且作成爲使驅動板之厚度較振動板之厚度爲厚。 (3 )在驅動板或振動板上設置與驅動板同步驅動的 壓電性之第二驅動構件。 (4 )將驅動板和前述第二驅動構件的合計質量，與 前述振動板之質量的比率作成爲5以下。 (5 )使驅動板之外形尺寸近似於振動板之外形尺寸 〇 由於如此方式對振動給予質量慣性，可降低固有振動 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) -11111--訂 I I — I ---- 經濟部智慧財產局員工消費合作社印製 -6 - 經濟部智慧財產局員工消費合作社印製 498696 A7 B7 五、發明說明（4 ) 頻率之同時，在其共振頻率亦可得高的聲壓。 又，由於設法著眼於電場、驅動性或外形尺寸以提升 振動性，可降低呈現在高頻側的高次諧波之共振，而能做 到在振動頻率之可聽頻帶的廣頻帶化’聲壓亦可得平坦者 〇 爲此之實現，採用下述方法較爲有效。 (1 )在驅動板或振動板之任一方之中央領域固接重 錘。 (2 )驅動板必須使用經埋設內部電極的積層體。 藉由在驅動板或振動板之任一方固接重錘而簡易地對 振動給予質量慣性，可降低固有振動頻率。又，藉由壓電 體之積層，而不致引起驅動電壓之增大之下能以有效率地 以大變位量驅動驅動板之同時，藉由增大厚度而共振頻率 將移位。據此，可容易實現上述（1 )至（5 )之方法， 不致招致聲壓之低落之下而可得經提升音質的壓電發聲體 〇 又，第二，本發明提供一種壓電發聲體之製造方法， 其特徵爲：製作由形成有電極的壓電材而成的驅動板和振 動板所構成，再具有調整振幅及共振頻率的振動調整部的 壓電發聲元件，並粘接箱體和該壓電發聲元件，藉由該粘 接劑支撐振動板。 藉由預先製作設置有振動調整部的壓電發聲元件並予 以固接而不致增加製造成本之下，即能製得音量降低小的 良好音質之壓電發聲體。本發明之前述以及其他目的，特 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -----------裝--------訂--------- (請先閱讀背面之注意事項再填寫本頁) 498696 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（5 ) 徵，優點將從以下之詳細說明及所附圖可明瞭。 〔發明之實施形態〕 以下，就本發明之實施形態加以詳細說明。在第1圖 中顯示有一實施形態之外觀及主要剖面。同圖中，壓電發 聲元件1 0係全體形成爲圓板狀而成爲在振動板1 2上使 驅動板1 4粘貼在一起的構成。另一方面，本身爲壓電發 聲元件1 0之支撐框的箱體2 0係直徑方向剖面爲略L字 狀而全體經形成爲圓環狀◦並且，藉由在此箱體2 0之高 低差2 2上擴及全周所設的粘接劑等支撐前述壓電發聲元 件1〇。 在前述振動板1 2之背面（圖之下側面）中央固接有 金屬製之重錘1 6。驅動板1 4係壓電體（壓電片）之積 層體構造而在內部平行埋設有內部電極3 0並在表面形成 有電極32，34。內部電極30係藉由通孔36而交替 方式連接至電極3 2，3 4。而分別將電極3 2連接至引 出端子3 8，電極3 4連接至引出端子4 0。引出電極 3 8，4 0可使用習用的金屬端子或導線等。另外，如振 動板1 2或箱體2 0爲金屬時，可作成爲從此引出一端之 端子之方式。 其次，就各構成要素再行說明。壓電發聲元件1 0之 振動板1 2可使用習用者。例如可使用1 0 /zm至1 0 0 // m程度厚之不銹鋼等之金屬板。 壓電發聲元件1 0之驅動板1 4係由使用例如， 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -8 - --------tT---------$· (請先閱讀背面之注意事項再填寫本頁) 498696 A7 B7 五、發明說明（6 ) p z T系等習用之壓電陶瓷材料的壓電陶瓷積層體所構成 。如上述，由於藉由通孔3 6交替連接表面之電極3 2， (請先閱讀背面之注意事項再填寫本頁) 3 4與內部電極3 0而在鄰接的電極間成爲交替之極性。 在此，通孔3 6係藉由設置通孔合模面（through-hole land )以及使用導電膏塡充通孔內而形成之。振動板1 2之位 移量可依驅動板1 4內之壓電材之積層張數之增減而調整 ，而藉由積層張數之增加而容易達成位移量之增大。積層 構造方面，除圖示者以外，各種構造者亦可適用。 經濟部智慧財產局員工消費合作社印製 箱體2 0較佳爲金屬製。由於使用金屬，即使在下側 置開口 2 6仍能製得強度高精度佳的箱體2 0。具體而言 ，較佳爲如鎂合金等的不易受氧化且熱膨脹率較小的金屬 ，或者如鋁般的輕量的金屬。可按開口 2 6之形狀，大小 ，數量（圖示之例爲1個）調整聲壓。箱體2 0之形狀較 佳爲環狀者，而可由平板之切削加工或沖孔加工製得。又 ，箱體2 0之高低差2 2之部份之內徑係較振動板1 2之 外徑爲大，且開口 2 6之大小爲較振動板1 2之外徑爲小 而作成爲在箱體2 0內能收容壓電發聲元件1 0的形狀尺 寸。 在此箱體2 0中支撐壓電發聲元件1 0的方法而言， 可在箱體2 0按嵌合等方法藉機械方式予以固定，惟如考 慮生產性時藉粘接劑之支撐方法較佳。在此，如振動板 1 2爲金屬的情形，較佳爲與金屬間的粘接性良好而不會 阻礙振動的材質，例如，矽系粘接劑等柔軟的材質者較合 適0 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） _ 9 - 498696 經濟部智慧財產局員工消費合作社印製 A7 _______B7 五、發明說明（7 ) 安裝在壓電發聲元件1 0的重錘1 6，可使用金屬片 °又’固定重錘1 6的位置而言，可如圖示之方式固定在 振動板1 2之略中央，亦可固定在驅動板1 4側（電極3 2側，或電極3 4側）。或者，亦可使用與前述驅動板 1 4之壓電體相同材質形成重錘1 6，並將此積層於驅動 板1 4並予以粘接之方式。如此作成，則壓電體之積層部 份可當作重錘1 6作用，同時亦可當作第2驅動體作用。 又’亦可將重錘1 6分割爲複數個並設置在各處之方式。 經如上所構成的壓電發聲體5 0，例如對圖中以虛線 表示的電子機器箱體5 2，按壓電發聲元件1 0之驅動板 1 4能成爲機器側之方式予以安裝。如按此方式直接將壓 電發聲體5 0安裝在電子機器箱體5 2，則可實現電子機 器之高密度化，尤其是低矮化。另外，對電子機器箱體 5 2不直接安裝而亦可作成爲將具有開口的遮蔽板僅作外 殼蓋覆在驅動板側之方式。 其次，外部連接用端子3 8，4 0可做各種變形。首 先，可將導線按直接電氣方式連接至驅動板1 4之電極 3 2，3 4。第2圖（A )所示的例係將金屬端子6〇， 6 2分別安裝在壓電發聲元件1 〇之周圍適當位置者。在 一端之金屬端子6 0，係按電氣方式經連接至驅動板1 4 上面之電極3 2，而作爲端子6 1連接至外部。另一端之 金屬端子6 2 ’係按電氣方式經連接至使用導電性金屬的 振動板1 2 ’而作爲端子6 3連接至外部。振動板1 2， 係使用導電性粘接劑按電氣方式經連接至驅動板1 4之背 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 10 -------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 498696 A7 _ B7 五、發明說明（8 ) 面側之電極3 4。金屬端子6 0，6 2，係將金屬片彎曲 爲曲軸（crank )狀者，而露出在箱體2 0之外周部位。另 外’如箱體2 0爲金屬之情形，則爲防止上述金屬端子 60，62，按電氣方式接觸箱子20起見，在其等之間 設置絕緣被覆6 4，6 6。 第2圖（B )係將經電氣連接至驅動板1 4之背面側 電極3 4的振動板1 2，使用導線6 6連接至箱體2 0者 。端子6 3將由箱體2 0之適當部位取出。在一端子之金 屬端子6 0側係與前述第2圖（A )之例相同。 如上之第2圖所示，藉由從箱體使用金屬片製的端子 而引出，可製得能實裝的壓電發聲體。當然，可作成爲引 出至箱體之外周側之側面後再連接之方式。 第3圖（A )所示之例，係將分叩具有聲壓調整用之 開口 71，73的平板70，72，作成爲設置在壓電發 聲體5 0之箱體2 0之背側或表面之方式者。如此，藉由 聲壓調整用之平板7 0或7 2之設置，即使壓電發聲體 5 0爲相同構造，仍能獲得不同的聲壓特性並可降低鑄模 成本等之製造成本。 其次，一邊參照第4圖，一邊說明上述的壓電發聲體 5〇主要製造過程。首先從將成爲驅動板的積層體開始說 明。製作在具有P Z T系組成的陶瓷粉末中經添加粘接劑 的泥槳，從此依刮刀片（doctor blade )等方法製得生片（ green sheet )。此生片之厚度較佳爲5// m至1〇〇 //m 範圍，特佳爲1 5 //m至5 0 之範圍。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -11- (請先閱讀背面之注意事項再填寫本頁) .·裝---- tr---------. 經濟部智慧財產局員工消費合作社印製 498696 A7 五、發明說明（9 ) (請先閱讀背面之注意事項再填寫本頁) 裁斷如此所得的生片之同時，將A g (銀），A g / P d (鈀（等之導電膏使用網版印刷（SCreen pnnting)等之 方法印刷並形成如第4圖（A )所示的積層片1 4 A至 1 4 C。另外，在該處所分別形成通孔1 4 D至1 4 F。 其後，如同圖（B)所示，進行各積層片1 4A至1 4C 之積層之同時，並予以加壓固定。然後，如同圖（C )所 示般，在通孔內部塡充導電性膏。其後，切斷爲預定形狀 之同時，以約1 1 0 0度至1 3 0 0度程度之溫度燒成， 製得例如外徑1 5mm，厚度6 0 之積層體。 此積層體藉由在兩面連接電極端子並施加直流電壓而 極化，並成爲壓電驅動板。由於作成爲如此的積層構造而 可在電壓內形成較單層構造之情形爲高的電場。如此的積 層構造之驅動板1 4係如第4圖（C )所示般粘接在振動 板1 2。振動板1 2與驅動板1 4之粘接係藉由在驅動板 1 2之主面依網版印刷等方法均勻印刷粘接劑1 2 A ’並 對此貼上驅動板1 4而施行。此時，粘接劑1 2 A亦可使 用導電性粘接劑。如此可製得壓電發聲元件1 0。 經濟部智慧財產局員工消費合作社印製 另一方面，在設置有開口 2 6的箱體2 0內之高低差 2 2上按環狀塗佈矽系粘接劑2 4之後，將上述的壓電發 聲元件1 0按如第4圖（C )所示之方式予以粘接。粘接 劑2 4硬化後，即成爲振動板1 2受支撐的構造。相反地 ，亦可在振動板1 2側按環狀塗佈矽系粘接劑2 4之後粘 接在箱體2 0之高低著2 2，惟作業性的效率上’較佳爲 在箱體2 0側塗佈粘接劑2 4。在此情形，由於按粘接劑 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -12- 498696 A7 ________ B7 五、發明說明（10 ) (請先閱讀背面之注意事項再填寫本頁) 2 4之度而壓電發聲元件1 〇之振動環境會變化之故，視 粘接劑2 4之硬度等之塗佈條件調整前述積層體之質量及 /或厚度。例如，如粘接劑2 4較硬時，要將積層體加重 ’加厚之方式。 其次’說明本形態之作用。在本形態中，作成爲較假 定驅動板1 4與振動板1 2之外徑比爲7的情形之該驅動 板1 4與該振動板1 2之質量比爲大，而驅動板1 4之厚 度爲較振動板1 2之厚度爲厚的構造。亦即，考慮驅動板 1 4及重錘1 6之全體質量及厚度能較振動板1 2爲大的 方式以決定形狀等。以往，壓電發聲體方面有人認爲驅動 板對振動板之比率以〇 · 7較爲理想（例如，T I C (股 )電子陶瓷1 9 8 4年秋季號壓電應用特輯「壓電擴音器 」）山添敏泰者）。然而，如考慮振動時之空氣阻抗或支 撐構造內之夜間振動阻害要因，若較以往增大體積。質量 則可提高音壓。藉由如此作法，即使降低作爲壓電發聲體 5〇的共振頻率，其聲壓仍高，且可得在較廣的頻率帶域 成爲平坦（flat )的聲壓振動。 經濟部智慧財產局員工消費合作社印製 經實驗確認，能得到良好的聲壓特性的振動板1 2與 驅動板1 4及重錘1 6之合計量之比率（驅動板1 4及重 錘1 6之質量/振動板1 2之質量），如考慮機械性剛性 及共振頻率降低效果之平衡時，較佳爲1 <合計比率< 5 之範圍之事實。 即使振動板1 2與驅動板1 4爲相同質量及/或厚度 ，亦可得同樣之效果。如增大驅動板1 4及重錘1 6之質 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -13 - 經濟部智慧財產局員工消費合作社印製 498696 A7 ---- B7 五、發明說明（11 ) 量及/或厚度即能流動充份量的能量，惟相當程度之剛性 將過於升高而聲壓之共振頻率f 0將升高。亦即，如驅動 板1 4和重錘1 6的合計質量與前述振動板之質量之比率 爲1以下之情形，由於振動抑制作用不足之故，不能期待 共振頻率之低頻化。又，前述比率爲大於5的情形，由於 驅動板1 4之剛性將大到所需要値以上之故，機械性振動 板將被過份抑制。上述之範圍係爲達成聲壓之提昇及共振 頻率之低頻化兩者方面有用。 另外’重錘1 6較佳爲設在壓電發聲元件1 〇之中央 。由如此設置，可使發聲元件1 〇之固有振動予以低頻化 ，結果能做到聲壓之頻率特性之高頻帶（band zone )化之 故。又，形狀方面，不限於圓板狀而可作成爲環狀（nng )而中心軸將與驅動板1 4 一致之方式。 再者，經實驗確認，振動板1 2與驅動板1 4之外徑 尺寸之比率較佳爲； 〇· 8 ^ (驅動板1 4之外徑/振動板1 2之外徑） 〇 由於如此設定規定外徑比，可能可抑制出現在高頻側 的高次諧波（high-order )之共振之故，聲壓之頻率特性將 成爲平坦而聲壓級（sound pressure level)將被平坦化。再者 ，由於重錘1 6之附加效果，可能共振頻率會位移◦由此 條件而看，亦可以振動板作爲重錘並製作具有較共振動板 爲大的外徑的驅動板以作成爲支撐該驅動板的構造。 上述的形態中，重錘1 6係作爲振動調整部發揮作用 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -14 - -----------裝--------訂---------^^1 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 498696 A7 B7 五、發明說明（12 ) 者，惟替代重錘1 6，驅動板1 4可作爲振動調整部發揮 作用。第5圖（A )所示的例’係作成爲將驅動板1 4 P 之質量及/或厚度作成爲較前述振動板12之質量及/或 厚度爲大的構造。亦即，在振動板1 2所貼上的驅動板 1 4 P係考慮驅動板1 4 P之全體質量及/或厚度能較振 動板1 2爲大的方式以決定形狀等。振動板1 2與驅動板 1 4 P之質量及/或厚度之比率，如考慮機械剛性及共振 頻率降減效果之平衡時，爲與上述的情形同樣較佳爲； 1 <(驅動板1 4 P之質量或厚度/振動板1 2之質 量或厚度）<5之範圍。 如第5圖（B )所示，藉由第2之驅動板1 4 Q之設 置亦可得到同樣之效果。第1之驅動板1 4及第2之驅動 板1 4 Q係按分開作爲另體構成之同時，按能壓電驅動第 2之驅動板1 4 Q之方式設置電極3 2 Q並將兩者連接固 定予以一體化。如將第1之驅動板1 4及第2之驅動板 1 4 Q預先以積層並使之一體化，則可成爲與第5圖（5 )同樣。在此例中，由於第2之驅動板1 4 Q不僅將與前 述重錘1 6同樣發揮作用，亦可作爲驅動裝置發揮作用之 故，即使降低共振頻率，其聲壓仍高且在廣的頻率頻帶中 可得良好的聲壓之振動。第5圖（C )係將第2的驅動板 1 4 Q形成在第1之驅動板1 4與振動板1 2之間者，而 在第2之驅動板1 4 Q上設置有電極3 4 Q。 再者，在如第3圖（B )所示，亦可作成爲在振動板 1 2之表面及背面設置驅動板8 0，8 2之方式。在此情 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -15- 裝--------訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 498696 A7 ____ B7 五、發明說明（13 ) 形，按兩個驅動板8 0，8 2之伸縮相位（expansion phase)不致相撞之方式調整振動模式及極化方向。在此例中 ，振動板1 2係按將其周緣對箱體8 4之溝8 6嵌入的狀 態以機械方式予以支撐。 另外，如此方式將積層體之一部份作爲振動調整部使 用的情形，除進行參考材料特性的調整之外，藉由前述生 片之厚度，電極層數，片層數等之調節而進行振動特性之 調整。 如上之第2之驅動板1 4 P，1 4 Q較佳爲與進行驅 動的壓電材料同一材料者，並較佳爲在積層過程時在第1 之驅動板1 4上進行積層形成。金屬片製的重錘1 6較佳 爲在驅動板1 4與振動板1 2之粘接過程時設置。當然， 亦可作成爲將重錘1 6以與驅動板1 4同一材料形成。又 ，可作成爲設置第2之驅動板及重錘兩者。 又，驅動板1 4之中心軸與振動板1 2之中心軸，在 發揮振動之效率至最大限起見，較佳爲使之一致。由於如 此調整，當振動時中心部將最受質量之影響而可給予大的 質量慣性。據此可更有效獲得上述的聲壓特性之效果。 第5圖（D )係電極3 2 R兼用驅動板1 4之表面側 電極及重錘的例，而第5圖（C )係電極3 4 R兼用驅動 板1 4之背面側電極及重錘的例。再者，可作成爲兼用驅 動板1 4之內部電極1 8及重錘之方式。不論任何一種方 式，均可得與前述例同樣效果。其次，就有關前述形態之 實施例加以說明。 本紙張尺度適用中國國家標準（CNS)A4規格（210x297公釐） -16 - 裝--------訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 498696 A7 B7 五、發明說明（14 ) 就本發明之實施例說明如下。將壓電體與振動板之外 徑之比作成爲0 · 8以上。壓電體可作成爲如前述形態般 予以積層或亦可不予以積層’惟較佳爲積層體者。本貫施 例中，作成爲：壓電體之外徑爲1 8mm，厚度爲6 2 //m，重量1 3 0毫克之3層構造之積層體；以及振動板 之外徑爲1 9mm，厚度2 0 ，重量3 0毫克之不銹 鋼材。重錘之重量作成爲2 0 0毫克。如按以往技術，如 作成爲驅動板與振動板之外徑比（驅動板/振動板）爲 〇· 7，而厚度爲相同時之驅動板重量爲9 0至1 〇 〇毫 克程度。 測定上述般的試料測定聲壓特性的結果爲如弟6圖曲 線G C所示者，比較以往之曲線（參照第8圖）時可知’ 共振頻率f 〇位移至3 Ο Ο Η z附近側之同時，3 0 0至 3〇Ο Ο Η ζ之可聽頻帶的聲壓級亦被平坦化而變成良好 。另外，如將壓電體之外徑改小爲1 4 m m時，則成爲如 曲線G D般而出現聲壓級極端降低的頻率。 本發明中有多種實施形態而可依據上述揭示能做多標 變化。例如，前述形態所示的材料或形狀，尺寸僅爲其中 之一例而視必要可適當予以變更。片之積層數’內部電極 之晶體點陣（pattern )亦一樣。可將驅動板之電極或內部 電極之晶體點陣作成爲按矩陣狀或部份開口的晶體點陣以 形成非電極形成部，可將其單板或積層體之非電極形成部 作爲重錘發揮功能並作成爲振動調整。 »t--------tr--------- (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） -17 - 498696 A7 ------B7____ 五、發明說明〇5 ) 〔發明之效果〕 如上所說明，本發明有如下之效果。 (1 )由於作成爲在經粘貼振動板與驅動板的壓電發 聲元件上設置振動調整部之故，對振動賦與適度之質量慣 性而成爲不致招致音量之下降而能降低共振頻率，並能得 到良好的音質。 (2 )由於作成爲規定振動板及驅動板之外形尺寸之 故，可降低高次諧波之共振，而能做到可聽頻帶的聲壓級 之平坦化。 (3 )由於作成爲預先製作設置有振動調整部的壓電 發聲元件並固接在箱體之故，不致增加製造成本之下能製 得音量之降低較小而音質良好之壓電發聲體。 (請先閱讀背面之注意事項再填寫本頁) 之 明 發 J 本 明示 說表 單·· 簡圖 之 1 面第 圖 面 咅 面 主 及 觀 外 之 態 形 施 圖 的 ·裝--------訂---------· 經濟部智慧財產局員工消費合作社印製 圖 第第第第第第第 圖圖圖圖圖圖圖 圖圖 ^、J^、-" 面面 剖剖 要要 主主 之之 形形 變變 之之 態態 形形 述述rr 示示 表表 圖 的 程。 過圖 造的 製部 要要 主主 之之 態態 形形 述他 前其 示示 表表 圖 的 。 的 圖性 的特 成壓 構聲 本本 基基 之之 件件 性元元 特聲聲 壓發發 聲電電 之壓壓 例之之 施往往 實以以 示示示 表表表 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 18- 498696 A7 _B7 五、發明說明（16 ) 經濟部智慧財產局員工消費合作社印製 〔符號之說明〕 10 壓電發聲元件 12Α 粘接齊ί 12 振動板 14Α 至 14C 積層片 14D 至 14F 通孔 14,14Ρ，14Q 驅動板 16 重錘 18 內部電極 20 箱體 22 局低差 24 矽系粘接劑 24 支撐體 2 6 開口 30 內部電極 32,32Q，32R，34,34Q,34Q 電極 36 通孔 38,40 引出端子 50 壓電發聲體 52 電子機器箱體 60,62 金屬端子 61,63 端子 64 絕緣被覆 (請先閱讀背面之注意事項再填寫本頁) ·裝 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -19 - 498696 A7 B7 五、發明說明（17 ) 66 導線 70 平板 71 開口 81 驅動板 84 箱體 86 溝 f0 共振頻率 -----------41^ 裝--------訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） _ 20 -498696 A7 --B7 V. Description of the invention (1) [Detailed description of the invention] [Technical field to which the invention belongs] (Please read the precautions on the back before filling out this page) The present invention relates to electronic audio equipment, communication equipment, and electronic equipment Used piezoelectric sounding body and its manufacturing method. [Background Art] Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economics The piezoelectric sound system is widely used as a simple electric sound conversion device, and it has been used in mobile phones and other fields in recent years. As shown in the cross-section of FIG. 7 (A), a piezoelectric driving plate 100 is generally attached to a metal vibrating plate 110. As the piezoelectric material, for example, piezoelectric ceramics {ceramics mainly composed of lead titanate (PZT), barium titanate, lead zirconate, lead titanate, etc.} can be used. Such a piezoelectric material is formed into a circular plate shape, for example, and is fired and polarized to obtain a piezoelectric driving plate 100. An electrode 102 for driving is provided on the piezoelectric driving board 100 (or on the front surface and the back surface). On the other hand, as the metal forming the metal vibration plate 110, for example, a Fe-Ni-based stainless steel material can be used. A piezoelectric sounding body (or a piezoelectric loudspeaker, a piezoelectric buzzer, etc.) can be produced by bonding the aforementioned piezoelectric driving plate 100 to a metal vibration plate 1 10 using a conductive adhesive. On the piezoelectric sounding body 120 obtained in this way, between the electrode 102 and the metal vibration plate 110, in other words, a driving signal 12 will be applied to the surface and back of the piezoelectric driving plate 100. Metal The vibrating plate 110 is usually grounded. If an electrical displacement is given to the piezoelectric driving plate 100 in this way, the piezoelectric driving plate 100 will be indicated by arrow FA in FIG. 7 (B), Stretch in the circumferential direction. However, due to the existence of the metal vibration plate 1 10, the size of this paper applies to the Chinese National Standard (CNS) A4 (210 X 297 mm). Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. B7 V. Description of the invention (2) The whole begins to bend, and as a result, the arrow FB vibrates up and down to produce sound. [Problems to be solved by the invention] The sound pressure characteristic of the piezoelectric sounding body will become For example, it is shown in the graph GA in Figure 8. In this figure, f 〇 Resonance frequency. F L is the frequency at which the sound pressure is low. This sound pressure characteristic is preferably in the audible range of a person, for example, it is flat in the range of 30 OH z to 3 kH z. On the other hand, Because the sound pressure will be extremely large near the resonance frequency, the reproduced sound will become unnatural to humans. If the diameter of the metal vibration plate is increased, the resonance frequency will be lowered. However, in this method, the shape of the piezoelectric sounding body will be It becomes larger. Also, by reducing the thickness of the piezoelectric sounding body, the resonance frequency can also be reduced. However, this method certainly has its limit in terms of structural strength. Therefore, in order to avoid the aforementioned inappropriate matters, there are methods The piezoelectric sounding body disclosed in Japanese Patent Publication No. 7 6-7 8 3 9 7. In this method, a resonance suppressing member using a metal or ceramic is provided on a piezoelectric vibration plate. As a result, it is possible to suppress the piezoelectric sound generator. Changes in the sound pressure level (level) of the resonance effect of the vibration plate. According to this method, as shown by the curve GB in Fig. 8, the resonance frequency will be shifted to the low area side, and the sound pressure will be suppressed. Sound pressure This is an unfavorable phenomenon that the frequency f L is extremely reduced. This is the reason that high-order vibration may occur in the piezoelectric sounding body. The present invention is directed to the above problems to provide good sound quality without reducing the sound ® Piezoelectric sounding body and its manufacturing method for the purpose ° This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -5- ---------------- ---- Order --------- line (please read the notes on the back before filling this page) 498696 A7 _ B7 V. Description of the invention (3) [Method to solve the problem] In order to achieve the aforementioned purpose ' First, the present invention provides a piezoelectric sounding body, which is a piezoelectric sounding body in which a vibration plate supported by a box and a driving plate made of a piezoelectric material formed with electrodes are bonded together, and the driving plate or the vibration The plate is provided with a vibration adjustment section that can increase the amplitude and reduce the resonance frequency. By setting the vibration adjustment section that adjusts the amplitude and resonance frequency, good sound quality can be obtained without lowering the volume. As the vibration adjusting unit, specifically, the following method can be adopted. (1) The electric field formed in the piezoelectric body of the driving plate is configured such that the electric field is higher than that in the case where the electrodes are opposed by a single layer, and the electric field is higher than the assumed driving plate and vibration plate In the case where the diameter ratio (the diameter of the driving plate / diameter of the vibration plate) is 0 · 7, the mass ratio of the driving plate to the vibration plate (mass of the driving plate / mass of the vibration plate) is large. (2) Composition The electric field formed in the piezoelectric body of the driving plate may cause a higher electric field when the electrodes are opposed to a single layer, and the thickness of the driving plate is thicker than that of the vibration plate. (3) A piezoelectric second driving member driven in synchronization with the driving plate is provided on the driving plate or the vibration plate. (4) The ratio of the total mass of the driving plate and the second driving member to the mass of the foregoing vibration plate Make it less than 5. (5) Make the external dimension of the driving plate similar to the external dimension of the vibration plate. Owing to the mass inertia applied to the vibration in this way, the natural vibration can be reduced. 297 mm) (please (Please read the notes on the back before filling this page) -11111--Order II — I ---- Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs -6-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7 B7 5 Explanation of the invention (4) At the same time as the frequency, a high sound pressure can also be obtained at its resonance frequency. In addition, due to efforts to focus on the electric field, driveability, or external dimensions to improve vibration, the high order presented on the high frequency side can be reduced. Harmonic resonance, and can achieve a wide frequency band in the audible frequency band of the vibration frequency. The sound pressure can also be flattened. To achieve this, the following method is more effective. The weight is fixed to the central area of either side of the plate. (2) The drive plate must use a laminated body with embedded internal electrodes. The mass inertia is simply given to the vibration by fixing the weight to either the drive plate or the vibration plate. , Can reduce the natural vibration frequency. Also, by the laminated layer of the piezoelectric body without causing an increase in the driving voltage, the driving plate can be driven with a large displacement efficiently while resonating by increasing the thickness. Frequency will shift According to this, the above methods (1) to (5) can be easily realized, and a piezoelectric sounding body with improved sound quality can be obtained without incurring a decrease in sound pressure. Second, the present invention provides a piezoelectric sounding A method for manufacturing a body is characterized in that a piezoelectric sounding element including a driving plate and a vibration plate made of a piezoelectric material having electrodes formed thereon, and a vibration adjusting unit for adjusting the amplitude and resonance frequency, and an adhesive box And the piezoelectric sound generating element, and the vibration plate is supported by the adhesive. The piezoelectric sound generating element provided with the vibration adjusting portion is made in advance and is fixed without increasing the manufacturing cost, so that the volume can be reduced. Small piezoelectric sounding body with good sound quality. For the aforesaid and other purposes of the present invention, the special paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm). -------- Order --------- (Please read the notes on the back before filling out this page) 498696 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (5 ), The advantages will be clear from the following detailed description and attached drawings[Embodiments of Invention] Hereinafter, embodiments of the present invention will be described in detail. Fig. 1 shows the appearance and main section of one embodiment. In the figure, the piezoelectric sound generating element 10 is formed in a disc shape as a whole, and has a structure in which a driving plate 14 is bonded to a vibration plate 12. On the other hand, the box body 20, which is the support frame of the piezoelectric sounding element 10, has a slightly L-shaped cross section in the diameter direction, and the entire body is formed into a ring shape. The difference 22 is extended to the entire periphery, and an adhesive or the like is provided to support the aforementioned piezoelectric sound generating element 10. A metal weight 16 is fixedly attached to the center of the back surface (lower side surface in the figure) of the aforementioned vibration plate 12. The driving plate 14 is a laminated body structure of a piezoelectric body (piezo sheet), and internal electrodes 30 are embedded in parallel inside, and electrodes 32 and 34 are formed on the surface. The internal electrodes 30 are alternately connected to the electrodes 3 2 and 3 4 through the through holes 36. The electrodes 32 are connected to the lead terminals 38 and the electrodes 34 are connected to the lead terminals 40 respectively. Lead-out electrodes 38, 40 can use conventional metal terminals or wires. In addition, if the vibration plate 12 or the case 20 is made of metal, it can be used as a way to lead out one terminal from this. Next, the constituent elements will be explained again. The vibration plate 12 of the piezoelectric sounding element 10 can be used by a user. For example, a metal plate such as stainless steel having a thickness of about 10 / zm to 1 0 // m can be used. The driving board 1 4 of the piezoelectric sounding element 10 is used by, for example, the size of this paper applies the Chinese National Standard (CNS) A4 (210 X 297 mm) -8--------- tT --- ------ $ · (Please read the notes on the back before filling out this page) 498696 A7 B7 V. Description of the invention (6) Pz T series piezoelectric ceramics laminated body made of conventional piezoelectric ceramic materials. As described above, since the electrodes 3 2 on the surface are alternately connected through the through holes 36, (please read the precautions on the back before filling in this page) 3 4 and the internal electrodes 30, which alternate polarity between adjacent electrodes. Here, the through holes 36 are formed by providing a through-hole land and filling the through holes with a conductive paste. The displacement amount of the vibration plate 12 can be adjusted according to the increase or decrease of the number of laminated layers of the piezoelectric material in the drive plate 14, and the increase of the displacement amount can be easily achieved by increasing the number of laminated layers. As for the laminated structure, in addition to those shown in the figure, various structures can be applied. The box 20 printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is preferably made of metal. Due to the use of metal, even if the opening 2 6 is placed on the lower side, a box 20 with high strength and high precision can be produced. Specifically, a metal such as a magnesium alloy that is not easily oxidized and has a small thermal expansion coefficient, or a lightweight metal such as aluminum is preferred. The sound pressure can be adjusted according to the shape, size, and number of openings 2 (1 in the example shown). The shape of the box body 20 is preferably a ring shape, and can be obtained by cutting or punching a flat plate. In addition, the inner diameter of the portion of the box 20 with a height difference 22 is larger than the outer diameter of the vibration plate 12 and the size of the opening 26 is smaller than the outer diameter of the vibration plate 12 The shape and size of the piezoelectric sounding element 10 can be accommodated in the case 20. As for the method of supporting the piezoelectric sounding element 10 in this box 20, it can be fixed mechanically in the box 20 by means such as fitting. However, when considering the productivity, the support method by using an adhesive is more suitable. good. Here, if the vibrating plate 12 is a metal, a material with good adhesion to the metal without hindering vibration is preferred. For example, a soft material such as a silicon-based adhesive is more suitable. Applicable to China National Standard (CNS) A4 specification (210 X 297 mm) _ 9-498696 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _______B7 V. Description of the invention (7) Heavy hammer mounted on the piezoelectric sounding element 10 16, can use a metal sheet ° and 'fix the weight 16' position, as shown in the figure can be fixed at the center of the vibration plate 12 slightly, can also be fixed to the drive plate 14 side (electrode 3 2 side , Or electrode 3 4 side). Alternatively, it is also possible to form the weight 16 using the same material as the piezoelectric body of the drive plate 14 described above, and to laminate and bond the weight to the drive plate 14. In this way, the laminated portion of the piezoelectric body can function as the weight 16 and also function as the second driving body. It is also possible to divide the weight 16 into a plurality of pieces and install them everywhere. The piezoelectric sounding body 50 constructed as described above can be mounted on the electronic device case 5 2 by pressing the driving board 14 of the electric sounding element 10 in the figure, for example, as a dotted line in the figure. If the piezoelectric sounding body 50 is directly installed in the electronic machine case 52 in this way, the density of the electronic machine can be increased, especially the height can be reduced. In addition, the electronic device case 5 2 may not be directly installed, but may be a method in which a shield plate having an opening is only used as a cover to cover the drive plate side. Secondly, the external connection terminals 38, 40 can be modified in various ways. First, the wires can be directly electrically connected to the electrodes 3 2, 3 4 of the drive board 1 4. The example shown in FIG. 2 (A) is one in which metal terminals 60 and 62 are mounted at appropriate positions around the piezoelectric sounding element 10, respectively. The metal terminal 60 at one end is electrically connected to the electrode 3 2 on the upper side of the driving board 1 4 and is connected to the outside as the terminal 61. The metal terminal 6 2 ′ at the other end is electrically connected to the vibration plate 1 2 ′ using a conductive metal to the outside as a terminal 6 3. The vibrating plate 12 is electrically connected to the back of the driving plate 1 4 using a conductive adhesive. The paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) 10 ------ ------------- Order --------- Line (Please read the precautions on the back before filling this page) 498696 A7 _ B7 V. Description of the invention (8) Front side之 electrode 3 4. The metal terminals 60 and 62 are those in which a metal piece is bent into a crank shape, and are exposed at the outer periphery of the box body 20. In addition, if the case 20 is a metal, in order to prevent the metal terminals 60, 62 from being electrically contacted with the case 20, an insulation coating 6 is provided therebetween. Figure 2 (B) shows the vibration plate 12 which is electrically connected to the back side electrode 3 4 of the drive plate 14 and is connected to the box body 20 using a wire 6 6. The terminal 63 will be taken out of the appropriate part of the box 20. The metal terminal 60 side of one terminal is the same as the example shown in FIG. 2 (A). As shown in Fig. 2 above, a piezoelectric sounding body that can be mounted can be manufactured by drawing out a terminal made of a metal sheet from the case. Of course, it can be used as a way to connect to the side of the outer peripheral side of the cabinet. The example shown in FIG. 3 (A) is a case where the flat plates 70 and 72 having openings 71 and 73 for sound pressure adjustment are divided to be provided on the back side of the case 2 0 of the piezoelectric sounding body 50 or Superficial way. In this way, by setting the flat plate 70 or 72 for sound pressure adjustment, even if the piezoelectric sounding body 50 has the same structure, different sound pressure characteristics can be obtained, and manufacturing costs such as the cost of a mold can be reduced. Next, the main manufacturing process of the above-mentioned piezoelectric sounder 50 will be described with reference to FIG. 4. The explanation starts with the multilayer body that will be the driver board. A clay paddle with a binder added to a ceramic powder having a PZT-based composition was produced, and a green sheet was prepared therefrom by a method such as a doctor blade. The thickness of the green sheet is preferably in the range of 5 // m to 100 // m, and particularly preferably in the range of 15 / m to 50. This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm) -11- (Please read the precautions on the back before filling this page). · Installation ---- tr ------- -. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7 V. Description of Invention (9) (Please read the precautions on the back before filling this page) At the same time when cutting the green film obtained in this way, the A g (silver) , A g / P d (The conductive paste of palladium (and so on) is printed and formed using a method such as screen printing (SCreen pnnting) and the like is formed as shown in FIG. 4 (A). Laminated sheets 1 4 A to 1 4 C. In addition, in Through holes 1 4 D to 1 4 F are formed in the space. Thereafter, as shown in Fig. (B), the lamination of each of the laminated sheets 1 4A to 1 4C is carried out and fixed under pressure. Then, as shown in the figure ( C) As shown in the figure, a conductive paste is filled inside the through hole. Thereafter, the conductive paste is cut into a predetermined shape, and then fired at a temperature of about 110 ° to 130 ° C. A laminated body having a diameter of 15 mm and a thickness of 60. This laminated body is polarized by connecting electrode terminals on both sides and applying a DC voltage, and becomes a piezoelectric driving plate. For such a laminated structure, a higher electric field can be formed in the voltage than in the case of a single-layer structure. The drive plate 14 of such a laminated structure is bonded to the vibration plate 12 as shown in FIG. 4 (C). The bonding between the vibration plate 12 and the driving plate 14 is performed by uniformly printing the adhesive 1 2 A ′ on the main surface of the driving plate 12 by screen printing or the like, and applying the driving plate 14 to this. At this time, a conductive adhesive can also be used as the adhesive 1 2 A. In this way, a piezoelectric sounding element 10 can be produced. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs On the other hand, After the silicon-based adhesive 24 is applied in a ring shape to the level difference 22 in the case 20, the above-mentioned piezoelectric sounding element 10 is bonded as shown in FIG. 4 (C). After the adhesive 2 4 is hardened, it becomes a structure in which the vibration plate 12 is supported. Conversely, a silicon-based adhesive 2 4 may be applied in a ring shape on the vibration plate 12 side and then bonded to the case 20 The height is 2 2, but in terms of workability, it is better to apply the adhesive 2 4 to the box 20 side. In this case, it is suitable for the paper size of the adhesive. National Standard (CNS) A4 Specification (210 X 297 mm) -12- 498696 A7 ________ B7 V. Description of Invention (10) (Please read the precautions on the back before filling this page) 2 Piezoelectricity with a degree of 4 Because the vibration environment of the component 10 will change, the quality and / or thickness of the laminated body may be adjusted depending on the coating conditions such as the hardness of the adhesive 2 4. For example, if the adhesive 2 4 is hard, it is necessary to laminate. Body weighting 'way of thickening. Next, the function of this form will be described. In this embodiment, the ratio of the mass of the driving plate 14 to the vibrating plate 12 is larger than that in the case where the ratio of the outer diameter of the driving plate 14 to the vibrating plate 12 is 7; The thickness is a structure that is thicker than the thickness of the vibration plate 12. That is, it is considered that the shape and the like of the driving plate 14 and the weight 16 can be larger than that of the vibration plate 12 as a whole in terms of mass and thickness. In the past, some people think that the ratio of the driving plate to the vibrating plate is ideal for piezoelectric sounding bodies (for example, TIC Electronic Ceramics, 1948, Fall 1984, "Piezophones" ") Shan Tian Mintai). However, if you consider the air resistance during vibration or the night vibration resistance factors in the support structure, if you increase the volume compared to the past. Quality increases sound pressure. By doing this, even if the resonance frequency of the piezoelectric sounding body 50 is reduced, the sound pressure is still high, and a sound pressure vibration that is flat in a wide frequency band can be obtained. Printed by an employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, which has been confirmed by experiments to obtain a good sound pressure characteristic of the vibration plate 12 and the driving plate 14 and the weight ratio 16 (the driving plate 14 and the weight 1) The mass of 6 / the mass of vibrating plate 1 2), when considering the balance between the mechanical rigidity and the effect of reducing the resonance frequency, the fact that it is in the range of 1 < total ratio < 5 is preferred. Even if the vibration plate 12 and the driving plate 14 have the same mass and / or thickness, the same effect can be obtained. If the quality of the drive plate 14 and the weight 16 are increased, the paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm). -13-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7- -B7 V. Description of the invention (11) The quantity and / or thickness can flow sufficient energy, but a considerable degree of rigidity will be too high and the resonance frequency f 0 of the sound pressure will increase. That is, if the ratio of the total mass of the drive plate 14 and the weight 16 to the mass of the aforementioned vibration plate is 1 or less, the vibration suppression effect is insufficient, and the low frequency of the resonance frequency cannot be expected. In the case where the aforementioned ratio is greater than 5, the rigidity of the drive plate 14 is larger than necessary, and the mechanical vibration plate is excessively suppressed. The above range is useful for achieving both an increase in sound pressure and a reduction in resonance frequency. In addition, the weight 16 is preferably provided in the center of the piezoelectric sounding element 10. With this arrangement, the natural vibration of the sound generating element 10 can be reduced in frequency, and as a result, the high-frequency band (band zone) of the frequency characteristics of the sound pressure can be achieved. In addition, the shape is not limited to a circular plate shape, but may be a ring shape (nng), and the central axis will be the same as the drive plate 1 4. Furthermore, it is experimentally confirmed that the ratio of the outer diameter dimension of the vibration plate 12 to the driving plate 14 is preferably; ·· 8 ^ (the outer diameter of the driving plate 14 / the outer diameter of the vibration plate 12) Setting a predetermined outer diameter ratio may suppress high-order resonances appearing on the high frequency side, so that the frequency characteristics of sound pressure will become flat and the sound pressure level will be flattened . In addition, due to the additional effect of the weight 16, the resonance frequency may shift. Based on this condition, the vibration plate can also be used as a weight and a drive plate with a larger outer diameter than the common vibration plate can be made as a support. The structure of the driving board. In the above-mentioned form, the weight 1 6 series functions as a vibration adjusting part. The paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm). -14------------ installation -------- Order --------- ^^ 1 (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7 B7 V. Invention Note (12), except that instead of the weight 16, the drive plate 14 can function as a vibration adjusting section. The example 'shown in FIG. 5 (A) has a structure in which the mass and / or thickness of the driving plate 1 4 P is larger than the mass and / or thickness of the aforementioned vibration plate 12. That is, the driving plate 1 4 P attached to the vibration plate 12 is determined in consideration of the fact that the overall mass and / or thickness of the driving plate 1 4 P can be larger than that of the vibration plate 12. The ratio of the mass and / or thickness of the vibration plate 12 to the driving plate 1 4 P, if considering the balance between the mechanical rigidity and the resonance frequency reduction effect, it is preferably the same as the above; 1 < (drive plate 1 Mass or thickness of 4 P / mass or thickness of the vibration plate 12) < 5 range. As shown in Fig. 5 (B), the same effect can be obtained by setting the second drive plate 1 4 Q. The first drive plate 1 4 and the second drive plate 1 4 Q are separately structured, and the electrodes 3 2 Q are provided in a manner capable of piezoelectrically driving the second drive plate 1 4 Q. The connection is fixed and integrated. If the first drive plate 14 and the second drive plate 1 4 Q are laminated and integrated in advance, it can be the same as that shown in FIG. 5 (5). In this example, since the second drive plate 1 4 Q will not only function as the weight 16 but also function as a driving device, even if the resonance frequency is lowered, its sound pressure is still high and wide. Good sound pressure vibration can be obtained in the frequency band. FIG. 5 (C) shows a second driving plate 1 4 Q formed between the first driving plate 14 and the vibration plate 12, and an electrode 3 4 is provided on the second driving plate 1 4 Q Q. In addition, as shown in FIG. 3 (B), it is also possible to provide a mode in which the drive plates 80, 82 are provided on the front and back surfaces of the vibration plate 12. In this case, the paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm). -15- Packing -------- Order --------- (Please read the Please fill in this page again) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7 ____ B7 V. Description of the invention (13), according to the expansion phase of the two drive plates 8 0, 8 2 will not collide Way to adjust the vibration mode and polarization direction. In this example, the vibration plate 12 is mechanically supported in a state where its periphery is inserted into the groove 86 of the box body 8 4. In addition, in the case where a part of the laminated body is used as a vibration adjusting part in this way, in addition to adjusting the characteristics of the reference material, the vibration is performed by adjusting the thickness of the green sheet, the number of electrode layers, and the number of layers. Adjustment of characteristics. As described above, the second driving plate 1 4 P, 1 4 Q is preferably the same material as the piezoelectric material to be driven, and is preferably formed on the first driving plate 14 during the lamination process. The weight 16 made of sheet metal is preferably provided during the bonding process of the driving plate 14 and the vibration plate 12. Of course, the weight 16 may be made of the same material as the driving plate 14. In addition, it can be used as both a second drive plate and a weight. It is preferable that the central axis of the driving plate 14 and the central axis of the vibration plate 12 be consistent with each other in order to maximize vibration efficiency. Due to this adjustment, the mass will be most affected by the mass when vibrating, and large mass inertia can be given. Accordingly, the effects of the above-mentioned sound pressure characteristics can be obtained more effectively. Fig. 5 (D) shows an example in which the electrode 3 2 R uses both the front-side electrode and the weight of the driving plate 14, and Fig. 5 (C) shows that the electrode 3 4 R uses both the back-side electrode and the weight in the driving plate 14. Case. Furthermore, it can be used as a method of using the internal electrode 18 and the weight of the driving plate 14 at the same time. Either way, the same effect as that of the foregoing example can be obtained. Next, an embodiment related to the aforementioned embodiment will be described. This paper size applies to China National Standard (CNS) A4 (210x297 mm) -16-Packing -------- Order --------- (Please read the precautions on the back before filling in this Page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 498696 A7 B7 V. Description of the Invention (14) An embodiment of the present invention will be described below. The ratio of the outer diameter of the piezoelectric body to the diaphragm is set to 0 · 8 or more. The piezoelectric body may be laminated as described above or may not be laminated ', but it is preferably a laminated body. In this embodiment, it is made of: a laminated body having a three-layer structure with an outer diameter of 18 mm, a thickness of 6 2 // m, and a weight of 130 mg; and an outer diameter of the vibration plate of 19 mm, Stainless steel with a thickness of 20 and a weight of 30 mg. The weight of the hammer is 200 mg. According to the conventional technology, the ratio of the outer diameter of the driving plate to the vibration plate (driving plate / vibrating plate) is 0.7, and the weight of the driving plate when the thickness is the same is about 90 to 100 milligrams. As a result of measuring the sound pressure characteristics of the above-mentioned sample, as shown in the graph 6 of the graph GC, when comparing the conventional curve (refer to FIG. 8), it can be seen that the resonance frequency f 〇 is shifted to the side near 3 〇 〇 Η z The sound pressure level in the audible frequency band of 300 to 300 Η ζ ζ is also flattened and becomes good. In addition, when the outer diameter of the piezoelectric body is reduced to 14 mm, it becomes a frequency at which the sound pressure level is extremely reduced like the curve GD. There are various embodiments in the present invention, and multiple standard changes can be made based on the above disclosure. For example, the materials and shapes shown in the aforementioned embodiments are only examples, and the dimensions may be appropriately changed as necessary. The same is true for the crystal pattern of the number of layers of the sheet 'internal electrodes. The crystal lattice of the electrode or internal electrode of the driving board can be made into a matrix or partially open crystal lattice to form the non-electrode forming portion, and the non-electrode forming portion of its single plate or laminated body can be used as a weight Function as vibration adjustment. »T -------- tr --------- (Please read the notes on the back before filling out this page) This paper size applies to China National Standard (CNS) A4 (210 x 297 mm) (Centi) -17-498696 A7 ------ B7____ 5. Description of the Invention 05) [Effect of the Invention] As explained above, the present invention has the following effects. (1) Since it is provided with a vibration adjusting portion on a piezoelectric sounding element with a vibration plate and a driving plate pasted, it imparts a moderate mass inertia to the vibration so that it does not cause a decrease in volume and can reduce the resonance frequency. Get good sound quality. (2) Since it has a predetermined external shape of the vibration plate and the driving plate, it can reduce the resonance of higher harmonics and flatten the sound pressure level in the audible frequency band. (3) As a piezoelectric sounding element provided with a vibration adjusting portion is made in advance and fixed to the case, a piezoelectric sounding body with a small volume reduction and good sound quality can be obtained without increasing the manufacturing cost. (Please read the precautions on the reverse side before filling out this page) Mingfa J. Explicit Form ·· 1 of the diagram, the first and the second side of the subject, and the appearance of the shape and appearance of the installation ----- --- Order --------- · Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs This section describes the process of the deformation of the main body and the shape of the main body. The manufacturing department that made the pictures must describe the state of the owner in the form of the master. The illustrations of the graphic elements of the special pressure-constructed sound element are based on the application of the pressure element of the sound element, sound pressure, sound, electricity, and electricity. CNS) A4 specification (210 X 297 mm) 18- 498696 A7 _B7 V. Description of invention (16) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs [Description of Symbols] 10 Piezoelectric sound element 12Α Bonding together 12 Vibration Plates 14A to 14C Laminates 14D to 14F Through holes 14, 14P, 14Q Drive plate 16 Weight 18 Internal electrode 20 Cabinet 22 Round difference 24 Silicone adhesive 24 Support 2 6 Opening 30 Internal electrodes 32, 32Q, 32R, 34, 34Q, 34Q electrode 36 through hole 38, 40 lead-out terminal 50 piezoelectric sounding body 52 electronic machine case 60, 62 metal terminal 61, 63 terminal 64 insulation coating (please read the precautions on the back before filling this page ) · The size of this paper is applicable to China National Standard (CNS) A4 (210 X 297 mm) -19-498696 A7 B7 V. Description of the invention (17) 66 Wire 70 Flat plate 71 Open 81 Drive plate 84 Box 86 groove f0 Resonance Frequency ----------- 41 ^ Installation -------- Order --------- (Please read the precautions on the back before filling out this page) Ministry of Economy Wisdom The paper size printed by the Property Cooperative's Consumer Cooperative is applicable to China National Standard (CNS) A4 (210 X 297 mm) _ 20-