TW480199B - Piezoelectric sensor for measuring bonding parameters - Google Patents

Piezoelectric sensor for measuring bonding parameters Download PDF

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Publication number
TW480199B
TW480199B TW090103931A TW90103931A TW480199B TW 480199 B TW480199 B TW 480199B TW 090103931 A TW090103931 A TW 090103931A TW 90103931 A TW90103931 A TW 90103931A TW 480199 B TW480199 B TW 480199B
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Taiwan
Prior art keywords
patent application
item
scope
sensor
signal
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TW090103931A
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English (en)
Inventor
Lai Wa Chan-Wong
Siu San Chiu
Siu Wing Or
Yiu Ming Cheung
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Asm Assembly Automation Ltd
Univ Hong Kong Polytechnic
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Publication of TW480199B publication Critical patent/TW480199B/zh

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    • H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L24/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B23K31/125—Weld quality monitoring
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480199 A7 r—B7 i、發明說明（1 ) 〔發明領域〕 本發明關於在積體電路元件接合時測量接合參數（例 如衝擊力，超音波振幅及接合時間）之壓電感測器，本發 明亦延伸及於有此種感測器之超音波接合設備。 〔發明背景〕 製造微電子產品及積體電路中，接合係利用一條金屬 接合線（例如鋁，金或銅）在二元件（例如一積體電路元 件與印刷電路板）之間產生電子連接之機械程序，接合程 序通常有二階段，在第一階段，一超音波接合設備觸及接 觸墊並使接合線預先變形，之後，在第二階段，接合設備 釋出一股超音波衝擊能量。在第二階段中接合設備振動並 開始以工具與接合線一起移動，並將表面上的不可接合氧 化層（若有者）移除。接合線接著在消除超音波能量及壓 力後變形，在接合線/接觸墊界面形成冶金接合。 在二階段中有些參數均需監視，在第一階段爲需要測 量及監視施加在接合線上的衝擊力及後續力以確保接合品 質，在第二階段，超音波衝擊的振幅及期間（接合時間） 對接合品質有明顯效應，因此須加以監視。可保證所需品 質的接合參數最佳範圍經決定以適於不同型式接合機，然 而，爲確保參數在此範圍內，其必須加以持續監視。 〔先前技術〕 美國第4，8 5 4 ’ 4 9 4號專利揭示一種監視接合 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) ·裝 ;π· 11 經濟部智慧財產局員工消費合作社印製 -4 - 480199 A7 _____ B7 五、發明說明（2 ) (請先閱讀背面之注意事項再填寫本頁) 參數之方法，其利用附接在一超音波聚能器的一壓電感測 器來測量超音波振幅，並利用應變規來監視接合力。然而 ’在此設計中需要二個別的感測器來監視接合參數。 美國第4 ，040 ，885號專利中揭示一種非破壞 性地監視超音波接合系統接合品質之設備，其係將接合工 具在自由振動（亦即無負荷）狀態下與接合操作期間的振 幅加以比較。 〔發明槪述〕 本發明之目的在於提供一種測量接合參數之簡單設備 ，其可爲超音波接合設備的一體部分，而可馬上由一接合 設備移到另一設備。 依據本發明，其提供在超音波接合操作中測量接合參 數之感測器，該感測器包括位於超音波接合設備的一超音 波傳感器附近之壓電材料，且有感測至少一第一接合參數 的一第一輸出端以及感測至少一第二接合參數的一第二輸 出端。 經濟部智慧財產局員工消費合作社印製 藉此裝置提供單一感測器’其可同時測量數個接合參 數，此外，藉由將感測器置於超音波傳感器附近’感測器 可與接合設備一體成型，使其能隨同接合設備由一接合機 移至另一接合機。另外，藉由提供用於不同參數的不同信 號輸出端以將要測量的不同參數的信號回應最佳化。 在本發明一較佳實施例中，第一輸出端用來測量衝擊 力，第二輸出端是用來測量超音波振幅和接合時間。第一 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐‘) 480199 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（3 ) 輸出端包括與所施加之衝擊力方向（沿著接合工具移動方 向）平行的一對電極，第二輸出端包括橫向於所施加之衝 擊力方向之一對電極。 電極可設在單片壓電材料上，此片壓電材料一般可爲 環狀’且電極可間隔9 0 °設在壓電材料周圍。然而壓電 材料亦可有其他形狀，例如方形或矩形。 最好設有信號處理裝置來處理由第一及第二輸出端來 之信號，處理裝置包括將二信號分離之裝置，此信號處理 裝置可包括用於第一信號輸出端來的信號輸出之一低通濾 波器’ 一局通濾波器，以及用於第二信號輸出端來之信號 輸出之諧波濾波器。信號處理裝置亦可包括信號放大裝置 〇 請了解本發明亦可延伸至倂有此感測器之接合裝置， 因此’由另一較廣觀點觀之，本發明提供超音波接合設備 ，其包括一超音波傳感器及一超音波聚能器，更包括位於 傳感器附近之含有壓電材料的一感測器，該感測器具有用 來感測至少一第一接合參數之一第一輸出端，以及用來感 測至少一第二接合參數之一第二輸出端。 〔圖式簡介〕 以下參照所附圖式舉例說明本發明一實施例，其中： 圖1係倂有依據本發明一感測器實施例之一超音波接 合設備部分分解立體圖。 圖2係接合設備及與系統其他元件連接槪示圖。 (請先閱讀背面t注意事項再填寫本頁) 裝 訂i ,拳 本紙張尺度國家鮮（CNS)A4舰⑵〇 x_2_97公爱)_ -6 - 經濟部智慧財產局員工消費合作社印製 480199 A7 B7_ 五、發明說明（4 ) 圖3係感測器剖面圖。 圖4係感測器第一輸出端槪示圖。 圖5係感測器第二輸出端槪示圖。 〔符號說明〕 1 安裝凸緣 2 超音波傳感器 3 超音波聚能器 4 接合工具 5 感測器 10 超音波信號產生器 11 放大器 12 低通濾波器 13 高通濾波器 14 電腦 2 0 電極對 2 1 電極對 3 1 放大器 33 第二諧波濾波器 3 4 放大器 9 接合設備 15 放大器 16 放大器 17 諧波濾波器 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐·) -------—^ I --------訂"-------- (請先閱讀背面之注意事項再填寫本頁) 480199 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 ) 11a 放大器 lib 放大器 〔較佳實施例詳述〕 請先參閱圖1 ，所示者爲倂有依據本發明一感測器5 較佳實施例之一超音波接合設備，接合設備9包含一安裝 凸緣1 ，超音波傳感器2，超音波聚能器，以及呈毛細管 或楔狀之接合工具4。超音波傳感器2可爲壓電式藍吉文 (Langevin )型夾層傳·感器，但亦可採用業界已知的任何 適當傳感器。傳感器2是用來在超音波頻率下產生振動， 之後在驅動工具4之前以聚能器3將振動放大。如上所述 ，接合設備爲習用。 然而，在本發明實施例中，一感測器5形成接合設備 9的一體部分，並位於傳感器2與聚能器3之間。在使用 接合設備9時，如圖2所示，傳感器2接收從一超音波信 號產生器1 0來之輸入，而感測器5 (稍後詳述）之輸出 先饋送到放大器1 1 a ，1 1 b並分別到低通及高通濾波 器12，13 (其方式後述），在通過放大器15 ，16 之後到一電腦1 4。如下所述者，感測器5之輸出可用來 監視重要接合參數並提供控制回饋信號給超音波信號產生 器1 0。特別言之，電腦1 4可貯存各接合參數可接受値 範圍，並設裝置將測得的接合參數與這些範圍比較。當測 得參數與可接受範圍不同，可產生一控制回饋信號將其帶 回範圍內。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） .----丨 裝--------訂--------- (請先閱讀背面之注意事項再填寫本頁) 480199 A7 B7 五、發明說明（6 ) 如圖3所示，感測器5包含一壓電材料環（可使用任 何適當壓電材料），二對電極2 0，2 1利用任何適當方 式（例如共火（co-firing )，電鍍，濺射，蒸發，電化殿 積）附接在壓電材料環上。第一對電極2 〇垂直設置而在 與接合工具4平行的一條線上，第二對電極2 1水平設置 ’亦即橫向於接合工具4。感測器的背面設一共用接地板 ’接出各電極對20，2 1輸出信號。圖4所示者爲第一 垂直電極對2 0之典型輸出信號，圖5所示者爲第二水平 電極對21之典型輸出信號。 二電極對2 0，2 1是用來感測不同參數，垂直對 2 0用來感測衝擊力，圖中可看出其對於接合工具4接觸 要接合之線而使接合設備9 -接合墊造成之彎曲力矩較有 反應，因其與接合工具4垂直對齊。圖4所示者爲電極典 型輸出，輸出之取出係從電極對2 0上者或下者。水平設 置的第二電極對2 1是用來測量超音波振幅及接合時間。 圖4所示者爲第一電極對2 0典型輸出，當接合工具 4與線接觸並使線壓靠接點墊而變形之時，偵測到一信號 (圖中在水平軸約5 m s之處）。此信號的振幅可用來決 定衝擊力，此信號亦示出稍後施加超音波衝擊能量下之連 續均勻反應。圖5則示出水平設置的第二電極對2 1典型 信號，圖中可看到此時電極輸出信號僅在接合工具4與表 面接觸之點有很小的信號，因爲此對電極係橫向於工具4 設置，在接觸期間對於接合設備彎曲力矩之偵測較不敏感 。然而，第二對電極2 1因應超音波衝擊能量提供較強且 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -------L----I 裝--- (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 480199 A7 B7 五、發明說明（7 ) 較淸晰之信號，因此可用來測量超音波衝擊能量之振幅及 接合時間。 (請先閱讀背面之注意事項再填寫本頁) 請參閱圖2 ，第一電極對2 0的輸出回饋到一放大器 1 1 a ，之後到一低通（例如4 Κ Η z )濾波器1 2，以 移除超音波振動，之後由放大器1 5放大。如上所述，此 信號可用來決定衝擊力。另一方面第二電極對2 1之信號 由放大器1 1 b放大，之後到一高通濾波器1 3 ，一諧波 濾波器1 7 (可有可無），之後到一放大器1 6。此信號 用來測量超音波振幅和接合時間。 請了解亦可使用其他電極構造，本發明不限於圖3所 示者，例如可使用多個電極，之後平均以提供輸出信號。 電極亦可形成圍繞環狀壓電材料的周圍弧形段，對習於此 技者而言馬上可知許多設計，重要的是垂直方向的電極與 接合工具4平行，以提供測量衝擊力之輸出，而橫向於接 合工具4的水平方向的電極用來測量超音波振幅及接合時 間。 經濟部智慧財產局員工消費合作社印製 上述實施例中，二電極對係形成在同一片壓電材料上 ，然而請了解壓電材料亦可分爲各具一電極對的二片。 -u- 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）

Claims (1)

  1. 480199 A8 B8 C8 D8 六、申請專利範圍 1 · 一種在超音波接合操作中測量接合參數之感測器 ，包括在一超音波接合設備的一超音波傳感器附近的壓電 材料，並包括用來感測至少一第一接合參數之一第一輸出 端，以及用來感測至少一第二接合參數之一第二輸出端。 2 ·依據申請專利範圍第1項之感測器，其中第一輸 出端係用來感測衝擊力，第二輸出端用來感測超音波振幅 及接合時間。 _ 3 ·依據申請專利範圍第2項之感測器，其中第一輸 出端包括方向與所施加之衝擊力方向平行之一對電極，第 二輸出端包括橫向於衝擊力方向的一對電極。 4 ·依據申請專利範圍第3項之感測器，其中電極係 設在單片壓電材料上。 5 ·依據申請專利範圍第4項之感測器，其中壓電材 料一般爲環狀，而電極係一定間隔設在壓電材料周圍。 6 ·依據申請專利範圍第5項之感測器，其中電極相 隔g〇。 〇 7 ·依據申請專利範圍第1項之感測器，更包括處理 來自第一及第二輸出端的信號輸出之信號處理裝置，該處 理裝置包括將二信號分離之裝置。 8 ·依據申請專利範圍第7項之感測器，其中信號處 理裝置包括用於第一信號輸出端的信號輸出之一低通濾波 器。 9 ·依據申請專利範圍第7項之感測器’其中信號處 理裝置包括用於第二信號輸出端的信號輸出之一高通濾波 本纸張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -1 1 - fm ϋ_ι— mi lam —HJV —nil §1>1 tm 1¾ (請先閲讀背面之注意事項再填寫本頁) 、1T 經濟部智慧財4局S工消費合作社印製 480199 ABCD 經濟部智慧財產局員工消費合作社印製 六、申請專利範圍 器及一諧波濾波器。 1〇·依據申請專利範圍第7項之感測器，其中信號 處理裝置包括信號放大裝置。 1 1 · 一種超音波接合設備，包括一超音波傳感器以 及一超音波聚能器，更包括一感測器，該感測器包括位於 傳感器附近的壓電材料，該感測器有用於感測至少一第一 接合參數的一第一輸出端以及用來感測至少一第二接合參 數的一第二輸出端。 1 2 ·依據申請專利範圍第1 1項之設備，其中第一 輸出端係用.來感測衝擊力，第二輸出端用來感測超音波期 間及振幅。 1 3 ·依據申請專利範圍第1 2項之設備，其中第一 輸出端包括方向與所施加之衝擊力方向平行之一對電極， 第二輸出端包括橫向於衝擊力方向的一對電極· 1 4 ·依據申請專利範圍第1 3項之設備，其中電極 係設在單片壓電材料上。 1 5 ·依據申請專利範圍第1 4項之設備，其中壓電 材料一般爲環狀，而電極係一定間隔設在壓電材料周圍。 1 6 ·依據申請專利範圍第1 5項之設備，其中電極 相隔9 0 ° 。 1 7 ·依據申請專利範圍第1 1項之設備’更包括處 理來自第一及第二輸出端的信號輸出之信號處理裝置，該 處理裝置包括將二信號分離之裝置。 1 8 .依據申請專利範圍第1 6項之設備’其中信號 ------Γ--10^------訂------0 (請先閲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（210X 297公釐） _ 12- 480199 A8 B8 C8 _ D8____ 々、申請專利範圍 處理裝置包括用於第一信號輸出端的信號輸出之一低通濾 波器。 1 9 ·依據申請專利範圍第1 6項之設備’其中信號 處理裝置包括用於第二信號輸出端的信號輸出之一高通濾、 波器及一諧波濾.波器。 2 0 ·依據申請專利範圍第1 6項之設備，其中信號 處理裝置包括信號放大裝置。 2 1 ·依據申請專利範圍第1 1項之設備，更包括計 算機裝置，其包括貯存所需接合參數之裝置，將所測得參 數與所需參數比較之裝置，以及產生回饋控制信號之裝 置。 --------·I------訂------0， (請先閲讀背面之注意事項再填寫本頁) 經濟部智慧財/!.局S工消費合作社印製 本紙浪尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -13-
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CN1310071A (zh) 2001-08-29
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US6279810B1 (en) 2001-08-28
HK1040951A1 (en) 2002-06-28

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