1357381 九、發明說明 【發明所屬之技術領域】 本發明是關於網版印刷裝置，尤其是關於錫球印刷的 凸塊形成方法。 【先前技術】 180〜150//m間距的球狀凸塊形成（直徑80〜100/zm )’包括有使用上述的高精度網版印刷裝置，進行印刷後 ，回流膏狀焊錫（cream solder)，實施錫球的形成之印 刷法。網版印刷裝置的1個例子中，具備有：基板搬入輸 送帶、基板搬出輸送帶、備有升降機構之工作台部、具有 轉印圖案來作爲開口部之遮罩、橡膠刮刀（squeegee )、 備有橡膠刮刀升降機構和水平方向移動機構之刮墨橡膠頭 、控制這些機構之控制裝置。基板從搬入輸送帶部搬入裝 置內後’將基板暫定位固定在印刷工作台部，之後用攝影 機來辨認基板及具有與電路圖案相對應的開口部的遮罩之 雙方的標記，修正雙方的位置偏移量，將基板與遮罩相對 位之後，讓印刷工作台上升，使基板與遮罩接觸，藉由橡 膠刮刀，一面使遮罩接觸到基板，一面對遮罩的開口部充 塡膏狀焊料等的糊體，接著下降工作台，藉由基板與遮罩 分離來將糊體轉印到基板上，之後，基板從裝置搬出，以 這方式進行印刷。 另外’已知有：對經過既高精度又微細的穿孔加工過 的治具投入錫球’以特定的間距排列且直接移載置基板上 -5- 1357381 ’載置後進行回流來形成錫球之錫球投入法。再則，依據 曰本專利特開2000 — 49 1 83號公報，還有：使遮罩搖動或 振動，對特定的開口充塡錫球的方法、或由利用毛刷的並 行運動等進行充塡之後予以加熱的步驟所組成之方法。 專利文獻1:日本專利特開2000-49183號公報 【發明內容】 <發明所欲解決之課題> 膏狀焊料的印刷法，因設備成本低廉，一次就能夠形 成大量的凸塊，所以具有的優點爲高生產流量並抑制在較 低的製造成本。然則，印刷法存在的問題爲不容易確保轉 印體積的均等性，經由顫動處理，將回流後的焊錫凸塊予 以壓模’進行高度平滑化的處理，步驟數太多導致設備成 本增加。另外’還存在的問題點爲隨著裝置的高密度化， 進展爲150〜120 y m間距等的精細化的情況，良率變差且 生產性不良。一方面，錫球投入法存在的問題點爲雖能夠 經由確保錫球的分級精度來形成穩定高度的凸塊且適於精 細化，但使用高精度的錫球吸附治具，利用機器人來搭載 錫球’仍會因精細化時的生產節拍增大、治具/設備價格 升高，造成凸塊形成成本的增大。 進而’日本專利特開2000 — 49 1 83號公報中，使遮罩 搖動或振動’對特定的開口充塡錫球的方法，存在的問題 是隨著錫球粒子徑的小徑化，發生粒子間的密貼現象，遮 罩的孔徑不到粒子徑的1 . 3倍，粒子間的密貼力則會大於 -6 - 1357381 粒子本身的重量，致使無法充塡到開口部。另 利用橡膠刮刀或毛刷的並進運動等進行充塡， 的問題。 本發明的目的是提供一種超精細間距的凸 同印刷法，一次就能夠形成大量的凸塊，且如 法，能夠形成穩定高度的凸塊之能夠既廉價又 率地進行印刷/充塡之高生產性之凸塊形成用 凸塊形成方法。 <用以解決課題之手段> 爲了要達成上述目的，本發明實施以下的 ’以印刷法所使用之既廉價又高精度之網版印 礎’開發出：可高速/高精度地將凸塊高度穩 粒子予以充塡/印刷之錫球充塡用印刷裝置。 要高效率地使用錫球，實現：錫球一面密閉狀 一面進行充塡/印刷。進而，開發出：抑制錫 良且品質穩定度很高的凸塊形成方法。 【實施方式】 第1圖中表示凸塊電極形成所使用之金屬 °第1(a)圖爲遮罩整體的狀態。第1(;b)圖 個裝置中所印刷的電極群之開口圖案2 Op的例 罩20安裝在版框21。以下，包括版框21，整 20。使用本遮罩的例子，係以電極導片部的直 外，同樣， 也存在同樣 塊形成，如 同錫球投入 高速且高效 印刷裝置及 手段。首先 刷技術爲基 定之錫球微 另外，爲了 態地保持， 球的充塡不 遮罩的例子 丨爲相當於1 子。即是遮 體稱爲遮罩 徑爲1 2 0 1357381 # m，間距爲150# m，對於1個CPU晶片的導片數有數 千個的電極導片群配置有數十個之容納多數個的基板，利 用印刷法進行凸塊形成所適用。第1 (a)圖中的四角形狀 爲表示1個電極導片群20a。即是與電極導片群相對應所 設置之遮罩開口部20c有多數個與電極導片的大小相對應 的直徑之開口。使用該遮罩20來進行印刷，印刷結束之 後，令印刷工作台1 0下降，被固定在印刷工作台1 〇的基 板5則會下降，藉此來實施退版動作並進行印刷。 第2圖中表示本發明的網版印刷裝置的構成。第2(a )圖中表示從網版印刷裝置的正面來看之構成及系統構成 之圖。進而，第2(b)圖中表示網版印刷裝置從側面來看 之構成。另外，在第3(a) 、3(b)圖中表示網版印刷裝 置從側面來看之構成且是表示印刷中的狀態。 以在本體框設置版框架（未圖示），在版框架上設定 安裝了具有開口部的印刷圖案之網版之遮罩20的方式構 成。在遮罩20的上方配置充塡/印刷頭2，在充塡/印刷頭 2裝著由橡膠刮刀（本發明則是具有篩網狀本體45及刮刀 (scraper)等來取代橡膠刮刀（squeegee)所構成）所組 成之充塡單元。充塡/印刷頭2係由利用充塡/印刷頭移動 機構6就能夠在水平方向上移動所構成。充塡單元可以藉 由充塡單元升降機構4來向上下移動。在遮罩20的下方 設置以與遮罩20相對向的方式載置保持屬於印刷對象物 的基板5之印刷工作台1 0。該印刷工作台1 0具備有：在 水平方向上移動基板5來進行與遮罩的對位之ΧΥ0工作 1357381 台11、及從搬入輸送帶25來承接基板5，且用來使基板5 與遮罩20面接近或接觸之工作台升降機構12。在印刷工 作台10的上面設置基板承接輸送帶26，在印刷工作台10 上承接藉由基板搬入輸送帶25所搬入的基板5，印刷結束 則將基板5排出至基板搬出輸送帶27。 印刷單元本體1中具備有自動地進行遮罩20與基板5 的對位之功能。即是藉由CCD攝影機15，遮罩20及基板 5所分別設有的對位用標記進行攝影，經影像處理來求出 位置偏移量，驅動ΧΥ0工作台11來進行對位，以修正該 偏移量。 此外，控制各驅動用的印刷控制部3 6或處理來自 CCD攝影機15的影像訊號之影像輸入部37等之印刷機控 制部3 0，設置在印刷機本體框的內部，用來進行資料的改 寫或印刷條件的變更等之資料輸入部5 0、或用來監視印刷 狀況等或所設置的辨認標記之顯示部40則是配置在印刷 機的外部。 印刷機控制部30中，設有控制充塡單元之充塡單元 控制部3 6，可以依據所生產凸塊的間距或錫球粒子徑的不 同和所使用金屬遮罩的種類，簡單地選擇設定適當的充塡 /印刷模式。另外，具備有：依照輸入影像來計算相關値 之相關値計算部31、或根據所投入的影像或來自字典38 的資料來找出形狀之形狀推定部32、求出位置座標之位置 座標運算部33、尺寸運算部34，形成爲由CCD攝影機15 所攝影的資料，根據設置在基板及遮罩之位置辨認標記， -9- 1357381 求出位置偏移量，驅動ΧΥ0工作台來進行對位之構成。 以下，針對本發明的印刷裝置的動作進行說明。 形成有凸塊的基板5，藉由基板搬入輸送帶25來供應 至基板承接輸送帶26，固定在印刷工作台10上的特定位 置。基板固定後，將CCD攝影機15移動至預先登錄設定 之基板標記位置。接著，CCD攝影機15將設置在基板5 和遮罩20之位置辨認用標記（未圖示）予以攝影，轉送 到印刷機控制部3 0。控制部內的影像輸入部3 7則從影像 資料來求出遮罩20與基板5的位置偏移量，根據該結果 ，印刷機控制部3 0，令使印刷工作台1 0移動的XY 0工 作台35動作，將基板5對遮罩20的位置予以修正/對位 。對位動作結束後，直到CCD.攝影機15不會與印刷工作 台10干涉的位置爲止，進行特定量的退避動作。CCD攝 影機15退避結束後，印刷工作台10上升，讓基板5接觸 遮罩20。之後，令充塡單元升降機構動作，使設置在充塡 /印刷頭2之篩網狀體接觸到遮罩20面。其次，一面對篩 網狀體施加振動，一面在遮罩面上移動，從篩網狀體的開 口，經由設置在遮罩面的開口，對基板的電極部供應錫球 〇 充塡/印刷頭2在水平方向上經過一定距離行程之後 上升。然後，印刷工作台10下降，遮罩20與基板5分離 ，被充塡至遮罩20的開口部之錫球，轉印到基板上。然 後’印刷了錫球的基板5，經由基板搬出輸送帶27，移送 到下一個步驟。 -10- 1357381 此外，基板5與遮罩20上相對地在同一部位，設置2 個以上的辨認對位用標記，該雙方各別的標記，利用具有 上下方向2視野之特殊的CCD攝影機15，從下方起辨認 遮罩20的標記，從上方起辨認基板5的標記，讀取設置 在特定部位之全部標記的位置座標，將基板5對標記20 的偏移量進行位置運算/修正，將基板5對標記20進行對 位。 其次，針對本發明的印刷頭進行說明。 第4圖中表示一面充塡/印刷頭2將錫球充塡至遮罩 ，一面在遮罩上移動時的模式圖。第5圖中表示充塡/印 刷頭的剖面圖。 如第4圖所示，充塡/印刷頭2中具備有：將載置有 錫球的篩網狀體45予以固定之篩網狀體固定配件3a、及 對篩網狀體45施加垂直或水平的振動之加振手段47、及 使供應至網版面上所未被充塡的錫球不致於殘留之可刮除 的刮刀（scraper ) 3。此外，第 4圖爲設成在刮刀（ scraper) 3上安裝篩網狀體之構成，不過也可以設成如第 5圖所示，篩網狀體安裝在篩網狀體固定配件3a，刮刀（ scraper) 3設置在該外側之構成。另外，還可以設成在篩 網狀體固定配件3a設置刷毛，省略刮刀（scraper ) 3之 構成。篩網狀體45係由具有網目狀的開口 46或是連續的 圓形、橢圓形、長方形或細縫等的開口 46之極薄的金屬 板所形成。此外，網目狀的開口 46可以利用電鑄法等， 一體成形在金屬板。放置在篩網狀體45的上部之錫球48 -11 - 1357381 ，能夠利用加振手段47來使篩網狀體45朝向垂直或水平 方向或者複合兩者的方向（箭頭42的方向）振動，將錫 球彼此間的密貼力予以減少/擴散，並且對錫球作用迴轉 力。利用對該錫球48所產生的迴轉力，對錫球48產生鉛 直方向向下成分的力量。利用該向下的力量，可以穿過篩 網狀體45的開口 46，將錫球48充塡到遮罩20之特定的 開口位置。即是充塡/印刷頭2則對篩網狀體45施加振動 ’並且在遮罩20面上朝向水平方向移動，連續地將錫球 48充塡/印刷至基板5面上的電極部5p。 如第5圖所示，充塡/印刷頭2係藉由篩網狀體45來 形成可以以密閉狀態保持印刷所必要量的錫球4 8之錫球 收納手段。充塡/印刷頭2則是以在印刷動作中使收納了 錫球48的篩網狀體45與對向的刮刀（scraper ) 3連結振 動的方式構成。即是以設置將篩網狀體固定配件3a及刮 刀（scraper ) 3予以施加振動之加振手段47，刮刀（ SCfaPe〇 3與篩網狀體45同步振動的方式構成。 第6圖中表示連結振動作用的一種篩網構造圖。篩網 狀體45係如前述，由極薄的金屬板所構成，該底面設有 網目狀等的開口 46。然後，該兩端部配合篩網狀體固定配 件3 a的傾斜予以彎折，彎折部安裝在篩網狀體固定配件 3 a的面。篩網狀體45很容易就能夠伸縮變形，利用該形 狀特性，當錫球直徑 >開口尺寸+伸縮變形尺寸的情況， 錫球48無法通過，能夠保持錫球48。一方面，相反當錫 球直徑 <開口尺寸+伸縮變形尺寸的情況，確保錫球48 -12- 1357381 可以通過的間隙，能夠充塡錫球。該篩網狀體45可以藉 由篩網狀體45施加振動或者磁力等的外力來產生伸縮。 第7圖中表示經過未圖示之篩網狀體45的充塡/印刷 頭進行錫球的充塡/印刷結構之說明圖。圖中，篩網狀體 固定配件3a爲將攻角（attack angle )設定成大約60度。 使用未圖示的加振手段47，一面將篩網狀體固定配件3a 朝向斜向（攻角方向）施加振動，一面使該充塡/印刷頭2 朝向箭頭41方向移動。該振動經由篩網狀體固定配件3a 傳達到篩網狀體45。該振動傳達到收納在篩網狀體45的 底面之錫球48，則會對錫球48產生箭頭41r方向的迴轉 力。利用該迴轉力，對錫球48產生箭頭41方向的力量（ 水平方向）、及箭頭41a方向（垂直方向）的力量。即是 利用迴轉力來對錫球48產生向下的力量。在該狀態下’ 篩網狀體45反覆進行伸縮，變成篩網狀體45延伸的狀態 的話，設置在該底面部的開口部則開口張開很大，從該處 ，錫球往遮罩面落下、行移動。掉落到遮罩開口部之錫球 ，利用篩網狀體的彎折角部或刮刀（scraper ) 3，壓擠進 入到遮罩開口部。掉落到遮罩面上的開口部以外之錫球， 藉由遮罩45的彎折角部或刮刀（scraper) 3等予以刮除 〇 此外，上述說明已針對設置刮刀（scraper )來刮除殘 留在遮罩面上的錫球進行說明過，不過也可以不設置刮刀 (scraper)，改而在篩網狀體固定配件3a的下部與遮罩 面接觸的部分設置刷毛，利用刷毛來掃除錫球。另外’前 -13- 1357381 述爲止的說明係設成在刷毛的本體部分設置篩網狀體之構 成’不過也可以與篩網狀體不同體地安裝刮刀（scraper) 或刷毛》此情況，必須要有將篩網狀體予以施加振動之加 振機構及將刮刀（scraper)或刷毛施加振動之加振機構。 其次，第8圖中表示對本發明所使用的遮罩開口部充 塡錫球的狀況的一個例子。另外，第9圖中表示設置在遮 罩下部之吸引流路的配置。第10圖則是表示遮罩開口部 的擴大圖。 如第8圖所示，遮罩20設成在由磁性材料所組成之 金屬層20s的下面設有樹脂層20η之2層構造的遮罩形狀 。此外，圖號20η爲爲了要真有密貼性及柔軟性而設置之 樹脂層，但考慮到耐久性，即使以鎳等很薄的金屬來形成 仍可以實現。對電極導片5ρ的上部，供應用來增加錫球 黏著性之焊劑5 f (糊體）。另外，在印刷工作台1 0的基 板承接面側，以與印刷工作台1 0面相同面的方式，固定 複數個磁鐵片10b。利用該磁鐵l〇b的磁力來吸引遮罩的 金屬層20s’以增加遮罩20與基板5各個面的密貼性。 另外’本實施例中，如第9圖所示，在金屬層20s的 下部之樹脂層20η，從設置在遮罩面之開口部起呈大致圍 棋棋盤的網目狀地設置用來吸引空氣流之構槽。該溝槽爲 當將遮罩載置在基板時將空氣排出之排氣流路52。此外， 排氣流路52係以將由設成包圍電極群的溝所構成的排氣 溝槽51予以相連結的方式形成。此外，配置用來吸引空 氣的幫浦’設置該幫浦連接排氣流路52的配管（未圖示 -14- 1357381 )。此外，上述的說明中係設成用幫浦經由排氣流路從遮 罩開口部吸引空氣之構成，不過也可以設成在充塡/印刷 頭側設有對遮罩面噴吹空氣之加壓空氣供應手段，印刷錫 ; 球後，對遮罩面噴吹壓縮空氣，從遮罩開口部，將錫球擠 壓進入電極導片部。此情況也可以設成先在構成遮罩的樹 脂層設置排氣流路由遮罩周邊來放出空氣之構成，錫球則 容易供應至遮罩開口部。 φ 如第1 〇圖所示，遮罩20係以樹脂層20η側的開口大 ' 於金屬層20s側的開口的方式形成。如此，在遮罩與基板 接觸側設置樹脂層，增加遮罩對基板的密貼性，並且防止 基板受到損傷，可以確實地對基板的電極部供應錫球。遮 罩之開口的間隔（間距）設爲L，金屬層20s側之開口的 直徑設爲Rs，樹脂層20η側之開口的直徑設爲Rr (= l.IRs )，排氣溝槽52的寬度設爲R1 (大約〇.4Rr)。遮 罩的開口直徑係依據所供應錫球的直徑來決定。 φ 如同以上所述，依據本發明，一次就能夠既廉價又高 > 速地形成錫球高度有穩定的精度之大量的錫球。另外，裝 置成爲簡單的構成，可以壓低設備成本。 【圖式簡單說明】 第1圖爲表示金屬遮罩的一個例子之圖。 第2圖爲表示網版印刷裝置的一個例子之圖。 第3圖爲用來槪略地說明網版印刷裝置的印刷動作之 圖 -15- 1357381 第4圖爲表示充填/印刷頭進行錫球充塡的例子之圖 〇 第5圖爲表示充塡/印刷頭的—個例子之剖面圖。 : 第6圖爲表示充塡/印刷頭的收納式篩網形狀的一個 例子之圖。 第7圖爲表示充塡/印刷結構之圖。 第8圖爲金屬遮罩之構造槪念圖。 φ' 第9圖表示金屬遮罩之排氣流路的例子之圖。 第10圖爲槪略地表示金屬遮罩的開口部及排氣流路 .- 之圖。 【主要元件符號說明】 1 :印刷單元本體 2 :充塡/印刷頭 3:刮刀（scraper) 5 :基板 , 1 〇 :印刷工作台 1 1 : XY 0工作台 15 :攝影機 20 :遮罩 45 :篩網狀體 -16-1357381 IX. Description of the Invention [Technical Field] The present invention relates to a screen printing apparatus, and more particularly to a bump forming method for solder ball printing. [Prior Art] The spherical bump formation (diameter 80 to 100/zm) of 180 to 150//m pitch includes the use of the high-precision screen printing apparatus described above, and after printing, the cream solder is returned. A printing method for forming a solder ball. In one example of the screen printing apparatus, a substrate loading conveyance belt, a substrate unloading conveyance belt, a table portion provided with an elevating mechanism, a mask having a transfer pattern as an opening portion, a rubber scraper, and a squeegee are provided. A rubber scraper mechanism for the rubber scraper lifting mechanism and the horizontal moving mechanism, and a control device for controlling these mechanisms are provided. After the substrate is loaded into the device from the loading belt portion, the substrate is temporarily positioned and fixed to the printing table portion, and then the camera and the mark of both the substrate and the mask having the opening corresponding to the circuit pattern are recognized by the camera, and the positions of both are corrected. Offset, after the substrate and the mask are opposite each other, the printing table is raised, the substrate is brought into contact with the mask, and the mask is brought into contact with the substrate by a rubber scraper, and the opening of the mask is filled with the paste. A paste such as a solder is then lowered onto the stage, and the paste is transferred to the substrate by separating the substrate from the mask. Thereafter, the substrate is carried out from the apparatus, and printing is performed in this manner. In addition, 'there are known to put the solder balls into the jigs that have been subjected to high-precision and fine perforation, and are arranged at a specific pitch and directly placed on the substrate - 5 - 1357381 ' after being placed and reflowed to form solder balls. The ball is put into the law. Further, according to Japanese Patent Laid-Open Publication No. 2000-49 1 83, there is also a method of shaking or vibrating a mask, filling a tin ball with a specific opening, or charging by a parallel motion using a brush. The method consisting of the steps of heating. Patent Document 1: JP-A-2000-49183 SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] The printing method of a cream solder can form a large number of bumps at a time because of low equipment cost. The advantage is high production flow and suppression at lower manufacturing costs. However, the printing method has a problem in that it is not easy to ensure the uniformity of the transfer volume, and the solder bump after reflow is highly smoothed by the stamper by the wobbling process, and the number of steps is too large, resulting in an increase in equipment cost. Further, there has been a problem that the progress of the pitch is 150 to 120 μm, and the yield is deteriorated and the productivity is poor as the density of the device is increased. On the other hand, the problem of the solder ball input method is that it can form a stable height bump by ensuring the classification accuracy of the solder ball, and is suitable for refinement. However, a high-precision solder ball adsorption jig is used, and the robot is used to mount the tin. The ball will still increase the production tempo during the refinement and increase the cost of the jig/equipment, resulting in an increase in the cost of forming the bump. Further, in the method of "shaking or vibrating the mask" to fill a specific opening with a solder ball, there is a problem that the particle is generated as the diameter of the solder ball is reduced. In the case of close contact, the aperture of the mask is less than 1.3 times the particle diameter, and the adhesion between the particles is greater than the weight of the -6 - 1357381 particles themselves, so that the opening cannot be filled. In addition, the problem of charging is carried out by using a rubber scraper or a parallel movement of a brush. SUMMARY OF THE INVENTION An object of the present invention is to provide a super-fine pitch convex-convex printing method capable of forming a large number of bumps at a time, and as such, a bump of a stable height can be formed at a low cost and in a high rate of printing/filling. A bump forming method for producing bumps. <Means for Solving the Problem> In order to achieve the above object, the present invention has been developed as follows: "The cheap and high-precision screen printing base used in the printing method" is developed: high-speed/high-precision convex The block is highly stabilized and the printing device is filled/printed with a solder ball. To use the solder ball efficiently, it is possible to fill/print the solder ball on one side. Further, a bump forming method which suppresses tin and has high quality stability has been developed. [Embodiment] Fig. 1 shows a metal used for forming a bump electrode. Fig. 1(a) shows a state of the entire mask. The cover 20 of the opening pattern 2 Op of the electrode group printed in the first device (1) is mounted on the frame 21. The following includes the layout 21 and the whole 20. The example in which the mask is used is the same as the electrode guide portion, and similarly, the same block is formed, such as a high-speed and high-efficiency printing device and means. First, the brush technique is based on the tin ball. In addition, in order to maintain the state, the ball is not covered by the mask. That is, the cover is called a mask diameter of 1 2 0 1357381 # m, and the pitch is 150# m. For the number of guides of one CPU wafer, there are thousands of electrode guide groups, and dozens of them are arranged to accommodate a plurality of The substrate is applied by bump formation by a printing method. The square shape in Fig. 1(a) shows one electrode guide group 20a. That is, the mask opening portion 20c provided corresponding to the electrode guide group has a plurality of openings having diameters corresponding to the size of the electrode guide sheets. Printing is performed using the mask 20, and after the printing is completed, the printing table 10 is lowered, and the substrate 5 fixed to the printing table 1 is lowered, whereby the ejecting operation is performed and printing is performed. Fig. 2 shows the configuration of the screen printing apparatus of the present invention. Fig. 2(a) is a view showing the configuration and system configuration of the screen printing apparatus. Further, Fig. 2(b) shows the configuration of the screen printing apparatus as seen from the side. Further, in the third (a) and third (b) drawings, the screen printing apparatus is viewed from the side and shows the state during printing. A screen frame 20 (not shown) is provided on the main body frame, and a screen 20 having a screen pattern of a printed pattern having an opening portion is set on the plate frame. A charging/printing head 2 is disposed above the mask 20, and a rubber blade is attached to the charging/printing head 2 (the present invention has a mesh body 45 and a scraper to replace the rubber squeegee). The unit consisting of The charging/printing head 2 is constructed by being movable in the horizontal direction by the charging/printing head moving mechanism 6. The charging unit can be moved up and down by the charging unit lifting mechanism 4. A printing table 10 holding the substrate 5 belonging to the printing object is placed under the mask 20 so as to face the mask 20. The printing table 10 is configured to move the substrate 5 in the horizontal direction to perform the alignment with the mask, and to work on the substrate 5 and the substrate 5 from the loading conveyor 25, and to cover the substrate 5 with the substrate 5 The table lifting mechanism 12 is in proximity to or in contact with the cover 20. A substrate receiving conveyance belt 26 is provided on the upper surface of the printing table 10, and the substrate 5 carried by the substrate loading conveyance belt 25 is received on the printing table 10. When the printing is completed, the substrate 5 is discharged to the substrate unloading conveyance belt 27. The printing unit body 1 is provided with a function of automatically performing alignment of the mask 20 and the substrate 5. That is, the alignment mark is provided by the CCD camera 15, the mask 20 and the substrate 5, and the positional shift amount is obtained by image processing, and the 工作0 table 11 is driven to perform alignment to correct the position. Offset. Further, the printer control unit 30 that controls the respective printing control unit 36 or the image input unit 37 that processes the video signal from the CCD camera 15 is provided inside the printing machine main body frame for rewriting the data. The data input unit 50 such as a change in printing conditions or the display unit 40 for monitoring the printing status or the like or the identification mark provided is disposed outside the printing machine. The printer control unit 30 is provided with a charging unit control unit 3 for controlling the charging unit, and can simply select the setting depending on the pitch of the produced bumps or the particle diameter of the solder balls and the type of metal mask used. Appropriate charging/printing mode. Further, the correlation calculation unit 31 for calculating the correlation 依照 according to the input image, or the shape estimation unit 32 for finding the shape based on the input image or the data from the dictionary 38, and the position coordinate calculation unit for obtaining the position coordinate 33. The size calculation unit 34 is formed as a material imaged by the CCD camera 15 and is positioned at a position on the substrate and the mask, and -9- 1357381 obtains a positional shift amount, and drives the ΧΥ0 table to perform alignment. Composition. Hereinafter, the operation of the printing apparatus of the present invention will be described. The substrate 5 on which the bumps are formed is carried by the substrate into the conveyance belt 25 to be supplied to the substrate receiving conveyance belt 26, and is fixed at a specific position on the printing table 10. After the substrate is fixed, the CCD camera 15 is moved to the substrate mark position set in advance. Next, the CCD camera 15 photographs the position identification marks (not shown) provided on the substrate 5 and the mask 20, and transfers them to the printer control unit 30. The video input unit 37 in the control unit obtains the positional shift amount between the mask 20 and the substrate 5 from the video data, and based on the result, the printer control unit 30 causes the XY 0 to move the print table 10 to work. The stage 35 operates to correct/align the position of the mask 5 on the substrate 5. After the alignment operation is completed, a certain amount of retracting operation is performed until the CCD. The camera 15 does not interfere with the printing table 10. After the retraction of the CCD camera 15 is completed, the printing table 10 is raised, and the substrate 5 is brought into contact with the mask 20. Thereafter, the charging unit elevating mechanism is operated to bring the mesh body provided in the charging/printing head 2 into contact with the mask 20 surface. Next, as the screen mesh body vibrates, it moves on the mask surface, and the solder ball is filled/printed from the opening of the screen body through the opening provided in the mask surface to the electrode portion of the substrate. The head 2 rises after a certain distance travel in the horizontal direction. Then, the printing table 10 is lowered, the mask 20 is separated from the substrate 5, and the solder ball is filled to the opening of the mask 20 and transferred onto the substrate. Then, the substrate 5 on which the solder balls are printed is transported out of the transport belt 27 via the substrate, and transferred to the next step. -10- 1357381 In addition, the substrate 5 and the mask 20 are provided at the same position, and two or more identification alignment marks are provided. The two respective marks are made of a special CCD camera 15 having a field of view in the vertical direction. The mark of the mask 20 is recognized from the bottom, the mark of the substrate 5 is recognized from the top, the position coordinates of all the marks provided at the specific part are read, and the offset of the mark of the board|substrate 5 with respect to the mark 20 is calculated and corrected, and a board|substrate is board|substrate. 5 Align the marker 20. Next, the print head of the present invention will be described. Fig. 4 is a schematic view showing a state in which the charging/printing head 2 fills the solder ball to the mask while moving on the mask. Fig. 5 is a cross-sectional view showing the filling/printing head. As shown in Fig. 4, the charging/printing head 2 is provided with a mesh-like fixing member 3a for fixing the mesh-like body 45 on which the solder balls are placed, and a vertical or vertical application to the mesh-shaped body 45. The horizontal vibration applying means 47 and the scraper 3 which is supplied to the unfilled solder balls on the screen surface are not left to be scraped. Further, Fig. 4 is a configuration in which a mesh body is attached to a scraper 3, but as shown in Fig. 5, the mesh body may be attached to the mesh body fixing fitting 3a, and the doctor blade (scraper) 3 is disposed on the outer side. Further, it is also possible to provide a bristles in the mesh body fixing fitting 3a, and to omit the configuration of the scraper 3. The mesh body 45 is formed of an extremely thin metal plate having a mesh-like opening 46 or a continuous opening 46 of a circular, elliptical, rectangular or slit. Further, the mesh-like opening 46 can be integrally formed on the metal plate by electroforming or the like. The solder balls 48 -11 - 1357381 placed on the upper portion of the mesh body 45 can vibrate the mesh body 45 in the vertical or horizontal direction or in the direction of the composite (direction of the arrow 42) by the vibration absorbing means 47. The adhesion between the solder balls is reduced/diffused, and the rotating force is applied to the solder balls. With the turning force generated by the solder ball 48, the solder ball 48 is forced to have a downward direct component. With this downward force, the solder ball 48 can be inserted through the opening 46 of the mesh body 45 to the particular opening position of the mask 20. That is, the charging/printing head 2 applies vibration to the mesh body 45 and moves in the horizontal direction on the surface of the mask 20, and the solder ball 48 is continuously charged/printed to the electrode portion 5p on the surface of the substrate 5. As shown in Fig. 5, the charging/printing head 2 is formed by a mesh body 45 to form a solder ball housing means for holding the solder balls 4 8 in a sealed state. The charging/printing head 2 is configured such that the mesh body 45 in which the solder balls 48 are housed is coupled to the opposing scraper 3 during the printing operation. In other words, the vibration absorbing means 47 is provided to vibrate the screen-like body fixing member 3a and the scraper 3, and the blade (the SCfaPe3 is vibrated in synchronization with the mesh body 45. Fig. 6 shows the connection A screen construction diagram for vibration. The mesh body 45 is composed of an extremely thin metal plate as described above, and the bottom surface is provided with an opening 46 such as a mesh shape. Then, the both ends are fixed with a mesh body. The inclination of the fitting 3a is bent, and the bent portion is attached to the surface of the mesh-like fixing fitting 3a. The mesh-like body 45 is easily deformable and deformable, and the shape of the solder ball is used as the diameter of the solder ball> + In the case of the telescopic deformation size, the solder ball 48 cannot pass, and the solder ball 48 can be held. On the one hand, on the other hand, when the solder ball diameter < opening size + expansion and contraction size, the clearance of the solder ball 48 -12 - 1357381 can be ensured. The mesh ball 45 can be expanded and contracted by external force such as vibration or magnetic force by the mesh body 45. Fig. 7 shows the filling of the mesh body 45 (not shown). /Printing head for charging the solder ball Illustrated diagram of the printing structure. In the figure, the mesh-shaped body fixing fitting 3a sets the attack angle to about 60 degrees. The screen-like body fixing fitting 3a is provided on one side by the vibration-removing means 47 (not shown). When the vibration is applied in the oblique direction (angle of attack direction), the charging/printing head 2 is moved in the direction of the arrow 41. The vibration is transmitted to the mesh body 45 via the mesh-shaped fixing metal fitting 3a. The vibration is transmitted to the storage body. The solder ball 48 on the bottom surface of the mesh body 45 generates a turning force in the direction of the arrow 41r to the solder ball 48. The force of the arrow 41 in the direction of the arrow 41 (horizontal direction) and the direction of the arrow 41a are generated by the turning force. The force in the (vertical direction) is the downward force of the solder ball 48 by the turning force. In this state, the screen mesh 45 is repeatedly expanded and contracted, and the mesh body 45 is extended. The opening of the bottom surface portion has a large opening, from which the solder ball falls to the mask surface and moves. The solder ball dropped to the opening of the mask is bent by the corner of the mesh body or the doctor blade. (scraper) 3, squeeze into the mask to open The tin ball that has fallen outside the opening on the mask surface is scraped off by the bent corner portion of the mask 45 or the scraper 3, etc. Further, the above description has been directed to setting a scraper. Although it is described that the solder ball remaining on the mask surface is scraped off, a scraper may not be provided, and instead, a bristles may be provided in a portion where the lower portion of the mesh-like body fixing fitting 3a is in contact with the mask surface, and the bristles are used. The solder ball is removed. The description of the above description of the first 13-1357381 is a configuration in which a mesh body is provided in the main body portion of the bristles. However, a scraper or bristles may be attached differently from the mesh body. In this case, it is necessary to have a vibration absorbing mechanism that applies vibration to the mesh body and a vibration absorbing mechanism that vibrates the scraper or the bristles. Next, Fig. 8 shows an example of a state in which the opening of the mask used in the present invention is filled with a solder ball. Further, Fig. 9 shows the arrangement of the suction flow path provided in the lower portion of the mask. Fig. 10 is an enlarged view showing the opening of the mask. As shown in Fig. 8, the mask 20 is provided with a mask shape of a two-layer structure of a resin layer 20n on the lower surface of a metal layer 20s composed of a magnetic material. Further, the reference numeral 20n is a resin layer provided for the purpose of being excellent in adhesion and flexibility, but in consideration of durability, it can be realized even if it is formed of a very thin metal such as nickel. The upper portion of the electrode guide 5p is supplied with a flux 5f (paste) for increasing the adhesion of the solder ball. Further, on the substrate receiving surface side of the printing table 10, a plurality of magnet pieces 10b are fixed so as to be flush with the surface of the printing table 10. The magnetic layer of the magnet 10b is used to attract the metal layer 20s' of the mask to increase the adhesion between the mask 20 and each surface of the substrate 5. Further, in the present embodiment, as shown in Fig. 9, the resin layer 20n at the lower portion of the metal layer 20s is provided in a mesh shape which is substantially a checkerboard from the opening of the mask surface to attract the air flow. Construction groove. This groove is an exhaust flow path 52 that discharges air when the mask is placed on the substrate. Further, the exhaust gas flow path 52 is formed to connect the exhaust gas grooves 51 formed by the grooves provided to surround the electrode group. Further, a pump for arranging the air is disposed in a pump (the -14-1357381 is not shown). Further, in the above description, the pump is configured to suck air from the opening of the mask via the exhaust flow path, but it may be provided that the air is blown onto the cover surface on the side of the charging/printing head. Pressurizing the air supply means to print the tin; after the ball, the compressed air is blown onto the mask surface, and the solder ball is squeezed into the electrode guide portion from the opening of the mask. In this case, it is also possible to provide a structure in which the exhaust flow path is disposed around the mask layer in the resin layer constituting the mask to release air, and the solder ball is easily supplied to the opening of the mask. φ As shown in Fig. 1, the mask 20 is formed such that the opening on the resin layer 20n side is larger than the opening on the metal layer 20s side. In this manner, the resin layer is provided on the side where the mask is in contact with the substrate, the adhesion of the mask to the substrate is increased, and the substrate is prevented from being damaged, so that the solder ball can be surely supplied to the electrode portion of the substrate. The interval (pitch) of the opening of the mask is set to L, the diameter of the opening on the metal layer 20s side is set to Rs, and the diameter of the opening on the resin layer 20n side is set to Rr (= l.IRs), and the width of the exhaust groove 52 Set to R1 (approx. R.4Rr). The diameter of the opening of the mask is determined by the diameter of the supplied solder ball. φ As described above, according to the present invention, a large number of solder balls having a stable height of the solder ball can be formed at a low cost and high speed at a time. In addition, the device has a simple configuration and can reduce equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an example of a metal mask. Fig. 2 is a view showing an example of a screen printing apparatus. Fig. 3 is a diagram for explaining the printing operation of the screen printing apparatus -15 - 1357381. Fig. 4 is a diagram showing an example of filling the solder ball with the filling head. Fig. 5 is a diagram showing charging/ A cross-sectional view of an example of a print head. Fig. 6 is a view showing an example of the shape of the storage screen of the charging/printing head. Figure 7 is a diagram showing the filling/printing structure. Figure 8 is a structural view of the metal mask. φ' Fig. 9 is a view showing an example of an exhaust flow path of a metal mask. Fig. 10 is a view schematically showing an opening portion of the metal mask and an exhaust flow path. [Description of main component symbols] 1 : Printing unit body 2: charging/printing head 3: scraper 5: substrate, 1 〇: printing table 1 1 : XY 0 table 15 : camera 20 : mask 45 : Screen mesh -16-