201200357 六、發明說明： 【發明所屬之技術領域】 本發明是關於使用於網版印刷的網目構件，尤其是在 使用於太陽電池的表面電極的印刷等的使用高黏度糊劑的 '印刷，不會有印刷模糊的情形，高低差異很少，並且可達 ‘ 成高印刷位置精度的印刷。 【先前技術】 網版印刷，是以積疊晶片電容器等的電子零件的製造 爲主，也利用於：太陽電池的表面電極也就是聚電用主電 極（母線）或聚電用柵電極（指叉電極）的形成。在使用 於網版印刷的印刷版（網版），使用著編織細線而成的網 目構件，該細線由金屬或樹脂（聚酯）所構成。而在編織 不鏽鋼細線的網目織物（以下稱爲「金屬網目織物」）的 周邊接合著：編織著聚酯細線而成的網目織物（以下稱爲 「聚酯網目織物」）的印刷版（複合遮罩）也被廣泛利用 0 複合遮罩，是將編織聚酯細線而成的網目織物張設在 鋁製的模框之後，將金屬網目織物黏接，將乾燥後與金屬 網目織物重疊的部分的聚酯網目織物切斷。然後塗佈感光 性乳劑，在金屬網目織物上將目的的印刷圖案進行曝光、 顯像，製作出印刷版。當在編織細線而成的網目織物相同 厚度的情況，開口率（後述第1圖所示的開口部的總計面 積率）越高則透過的糊劑的量則越多。在太陽電池的表面 -5- 201200357 電極的印刷等，是利用開口率50〜60%程度的金屬網目織 物。 如太陽電池的表面電極的印刷，當使用高黏度的糊劑 進行印刷寬度1 〇〇μηι〜2mm程度的印刷時，廣泛利用了網 版印刷（例如，專利文獻1 )。可是，當使用金屬網目織 物而以高黏度的糊劑印刷時，會有網目痕跡容易殘留，且 印刷的高低差容易有差異性的問題。在太陽電池的表面電 極這樣的聚電用電極的情況，如果有高低差的差異性或有 電極高度較低的部分的話，則電阻會變高，所以必須有能 進行高低差較小的印刷的網目構件。 在太陽電池的表面電極，如果受光面積變大且電極的 電阻減少的話，則發電效率會提升。因此，表面電極儘可 能地將其長寬比提高，也就是努力讓電極的寬度變窄，電 極高度提高。可是，在電極寬度爲狹窄到50μπι左右時，在 使用金屬網目織物的網版印刷，則無法充分地排出糊劑， 所以往往所印刷的電極的高度變低。 並且，已知金屬網目織物在反覆印刷後會伸展，印刷 位置會偏移。因此，當需要較高印刷位置精度的印刷的情 況，會有在印刷次數仍較少的階段則需要更換印刷版的問 題。 第1圖，是通常使用於網版印刷的印刷版的局部放大 說明圖。將編織了由金屬或聚酯所構成的細線1的網目構 件（網目織物），張設於網版框（沒有圖示）之後，全面 塗佈樹脂4 (感光性乳劑）而以遮罩覆蓋，只有沒有印刷 -6- 201200357 的部分曝光，使感光性乳劑4硬化’將想印刷的部分的感 光性乳劑4去除，製作印刷版5 (在圖中2表示網目構件的 開口部（網目開口部））。而樹脂4 (感光性乳劑）’通 常是較網目構件更厚10〜”^^的程度。 在網版印刷’如第2圖（a )〜（c )所示’藉由使刮 刀6移動，來將糊劑7充塡到印刷圖案部3 (參考上述第1圖 )的網目開口部2，並且使糊劑7附著於印刷對象物8 °在 刮刀6通過後，藉由印刷版的張力讓印刷版5 (參考上述第 1圖）與印刷對象物8分離，而糊劑7殘留於印刷對象物8， 依照去除了感光性乳劑4的圖案印刷。印刷過後的糊劑7， 在對應於網目開口部2的部分較厚，對應於細線1的部分較 薄（第2圖（b))，藉由糊劑7的黏性與表面張力而平坦 化（整平）（第2圖（c))。此時，糊劑7越過印刷版5的 網目開口部2而擴張。該糊劑的擴張稱爲印刷的滲開（第2 圖（c)中，以7a顯示）。 印刷膜厚度（塗佈在印刷對象物8的糊劑7的厚度dl ) ，藉由印刷版5的厚度、網目構件的開口率（開口部2的總 計面積比率）所決定，已知在相同印刷面積的情況，則成 立印刷膜厚度（μπι )=印刷版的厚度（μπι ) X開口率（％ )的關係。 作爲製造網目構件的方法，提出有藉由電鑄法將鎳等 堆積成網目狀的方法（例如專利文獻2、3)。可是已知在 以電鑄法製作的金屬箔會產生強度的差異的情形，在以電 鑄法製作的網目也可能會產生強度的差異。雖然也考慮過 201200357 在鎳等的金屬箔以蝕刻等進行開孔加工來作成網目構件的 技術，而與利用電鑄法作成的網目構件同樣會產生強度的 差異。 爲了較金屬網目織物更提升糊劑的排出性，也提出利 用金屬遮罩的技術。例如在專利文獻4，提出了一種金屬 遮罩，在太陽電池表面電極的印刷，爲了使糊劑的排出性 更提升，在金屬板設置開口部，在開口之間加上厚度較金 屬部分更小的支承體部（也稱爲「架橋」），則一邊保持 遮罩一邊使糊劑的排出性提升。可是在這種技術，爲了讓 聯繫印刷圖案部的支承體部存在，在印刷寬度較小的情況 ，可能糊劑無法充分遮蔽支承體部，而無法充分獲得支承 體部的印刷高度。而在開口部之中，在遮蔽部存在有所謂 的導塊狀的情況，爲了維持強度，則需要將支承體部的寬 度加大、或增加支承體部的數量，所以也可能因爲沒有排 出糊劑的支承體部的原因，而產生印刷模糊的情形。 因此，需要一種網版印刷用網目構件，即使如在太陽 電池的表面電極的印刷所使用的導電性銀糊劑，在使用高 黏度的糊劑時，印刷不會模糊，不易殘留網目痕跡（也就 是電極的高低差異較小）地進行印刷，並且印刷位置精度 較高。 〔先前技術文獻〕 〔專利文獻〕 專利文獻1:日本特開2005-150540號公報 專利文獻2:日本特許第3 5 1 68 82號公報 201200357 專利文獻3:日本特許第2847746號公報 專利文獻4:日本特開2006-341 547號公報 【發明內容】 〔發明欲解決的課題〕 本發明鑑於這種情形，其目的要提供一種網版印刷用 網目構件，即使在使用高黏度的糊劑的情況，也不會有印 刷模糊的情形，能達成高低差異很少的印刷，並且可得到 高印刷位置精度。 〔用以解決課題的手段〕 本發明包含以下的型態。 (1 )是用來以感光性乳劑形成印刷圖案的網版印刷 用網目構件，上述網版印刷用網目構件，是藉由軋製金屬 箔所構成，在與印刷對象物的印刷區域相當的軋製金屬箔 的部分，具有朝向印刷對象物擴大的多數的孔部，以與上 述印刷區域相當的軋製金屬箔的部分的印刷對象物側的線 部最大寬度A、上述孔部與孔部的間隔B的比A/B，所規定 的最大線寬係數小於0.40 » (2) 在上述（1)記載的網目構件其中，上述軋製金 屬箔，在與印刷對象物的印刷區域相當的部分以外，具有 與印刷對象物的非印刷區域相當的部分，在相當於該非印 刷區域的部分，沒有開設孔部。 (3) 在上述（1)記載的網目構件其中，上述軋製金 -9- 201200357 屬箔，在與印刷對象物的印刷區域相當的部分以外，具有 與印刷對象物的非印刷區域相當的部分，在相當於該非印 刷區域的部分，以相較於相當於印刷區域的部分的孔部的 開口率更小的開口率，開設有多數的孔部。 (4) 在上述（1)〜（3)其中之一記載的網目構件 其中，與上述印刷區域相當的軋製金屬箔的部分的印刷對 象物側的線部最大寬度A爲小於30μιη。 (5) 在上述（1)〜（4)其中之一記載的網目構件 其中，厚度爲5μιη以上，3Όμιη以下。 (6) 在上述（2)〜（5)其中之一記載的網目構件 其中，相當於上述印刷區域的軋製金屬箔的部分、與相當 於該非印刷區域的軋製金屬箔的部分的交界的輪廓，至少 局部圓角化。 (7) 在上述（1)〜（6)其中之一記載的網目構件 其中，構成線部的至少單面爲平坦的。 (8) 在上述（1)〜（7)其中之一記載的網目構件 其中，上述軋製金屬箔，是由：不鏽鋼、鈦、鈦合金、鎳 、鎳合金、銅、銅合金、及鋁合金所構成的群組中選擇出 的一種所構成。 〔發明效果〕 藉由本發明的網版印刷用網目構件，則能適當地規定 :以與印刷區域相當的軋製金屬箔的部分的印刷對象物側 的線部最大寬度A、孔部與孔部的間隔Β的比（Α/Β )所規 -10- 201200357 定的最大線寬係數，所以能實現一種網版印刷用網目構件 ’即使在使用高黏度的糊劑的情況，也不會有印刷模糊的 情形，能達成高低差異很少的印刷，並且可得到高印刷位 置精度：該網版印刷用網目構件，以電子零件的製造爲主 ’對於太陽電池的表面電極也就是聚電用主電極（母線） 或聚電用柵電極（指叉電極）的形成非常有用。 【實施方式】 本發明者們，調查了在習知技術的金屬網目織物，印 刷圖案較細時無法有良好的厚膜印刷的原因。製作複合遮 罩，該複合遮罩組合了不鏽鋼細線的網目織物（厚度35 μηι ’網目數：3 25 (條/吋））與聚酯網目，以能拍攝高速動 畫的微觀測器（日本股份有限公司KEYENCE製：型式VW-6000 )觀察：利用印刷線寬度：80μιη的網版印刷過程。此 時的糊劑使用導電性銀糊劑（日本東洋墨水製造股份有限 公司製：「RAFS」）。 觀察的結果，尤其在金屬網目織物的交叉部，糊劑的 遮蔽性變差，並且判斷出糊劑有殘留於印刷後的金屬網目 織物的孔部（開口部）的傾向。產生這種現象的原因，應 該是網目織物存在的部分的印刷高度變低，產生印刷高度 的差異（高低差）、或印刷到印刷對象物的糊劑的量變少 ，印刷高度變低的緣故。而糊劑殘留於孔部的原因，應該 是附著在不鏽鋼細線的交叉部的糊劑，當受到表面張力的 影響而離開網版時，與周邊的糊劑一起附著於網目的緣故 -11 - 201200357 。根據觀察結果，爲了解決金屬網目織物的課題，針對當 網版印刷時的網版離開時，沒有糊劑殘留於網目的構造加 以硏究。 爲了獲得沒有金屬網目織物這樣的交叉部的網目構件 ，嘗試在軋製金屬箔藉由蝕刻、雷射加工、噴射方式進行 開孔加工。結果，從開口精度與開口速度的觀點，判斷蝕 刻方式最適合。而當藉由蝕刻處理進行開孔加工時，當藉 由來自兩面的蝕刻進行開孔加工時，由於在孔部的局部形 成有凸部，所以當網版印刷時可能會有糊劑滞留。因此， 從一方面藉由蝕刻處理進行開孔加工較佳。結果，孔部的 形狀（外觀形狀），爲從其中一方側朝另一方側擴大的形 狀，藉由將孔部形成爲朝向印刷對象物擴大，則可避免糊 劑滯留的情形。 當孔部的外觀形狀爲朝向印刷對象物擴大時，爲了硏 究在成爲垂直時，糊劑的排出性有無不同，而進行解析。 解析方法，是使用氣液二相非壓縮性流動解析的高度設定 法，解析軟體爲COMSOL公司（瑞典）製「COMSOL Multiphysics j 。孔部的外觀形狀朝向印刷對象物擴大時 的開口率，刮刀面側爲3 8%，印刷面側（也就是印刷對象 物側）爲77% (兩面的平均開口率爲58% )，垂直的情況 的開口率，刮刀面側與印刷面側都假設爲5 8 %。而網目構 件的厚度爲15μιη，糊劑的黏度假設爲高黏度的200Pa · s。 解析的結果，當孔部的外觀形狀朝向印刷對象物擴大 時，刮刀通過後20msec，糊劑從網目構件完全排出，相對 -12- 201200357 的，成爲垂直的情況，刮刀通過後20msec，糊劑的一部分 附著在網目構件的印刷面側。當糊劑的黏度假設爲1 〇〇〇Pa • s時，當孔部的外觀形狀朝向印刷對象物擴大時，刮刀 通過後20msec，糊劑從網目構件完全排出，相對的，成爲 垂直的情況，刮刀通過後25msec，糊劑的一部分仍附著在 網目構件的印刷面側，排出性的差異更明顯。根據該解析 結果，爲了使用高黏度糊劑進行網版印刷，將孔部加工成 讓孔部的外觀形狀朝向印刷對象物擴大，相較於加工成垂 直的方式，糊劑的排出性較良好。並且印刷面側的開口率 與刮刀面側的開口率的差，能夠在5〜8 0 %程度。如果考慮 糊劑的排出性等的話，20〜50%程度較佳。 本發明者們，在厚度16μιη的軋製不鏽鋼鋼箔（東洋精 箔股份有限公司製：規格SUS304-H)，僅從單側噴霧上蝕 刻液進行開孔加工，製作網目構件。孔部與孔部的間隔（ 間距）爲80μηι (網目數：320 (條/吋））。單面的開口率 爲64% ’另一面的開口率爲3 2% (兩面的開口率的平均48% )。爲了與藉由金屬網目織物所構成的網目構件比較糊劑 的排出性，使用與金屬網目織物的糊劑印刷過程的觀察同 樣的微觀測器進行觀察。結果判斷，在藉由軋製金屬箔所 構成的網目構件（軋製金屬箔網目構件），糊劑的排出， 與藉由金屬網目織物所構成的網目構件相比爲較平均。而 在軋製金屬箔網目構件’在細線網目織物所觀察的孔部（ 開口部）並沒有殘留糊劑。並且當孔部朝向印刷面側擴大 時，以及在印刷面側孔部變窄的情況，都沒有發現糊劑的 -13- 201200357 殘留。 根據該結果發現，藉由在軋製金屬箔進行開孔加工所 構成的網目構件，糊劑的排出很均勻，在網版印刷後，在 開口部並沒有殘留糊劑。 爲了測定如上述的軋製金屬箔網目構件（厚度：16μηι ，間距：80μιη )的印刷位置精度，實施反覆印刷實驗。製 作將軋製金屬箔網目構件與聚酯網目織物接合的複合遮罩 ，塗佈感光性乳劑之後，將測試用印刷圖案進行曝光、顯 像，製作印刷版。使用該印刷版，將5000次的反覆印刷後 的印刷位置進行測定的結果，印刷位置精度在1 5μπι以內。 在金屬網目織物的情況，已知爲3 Ομιη左右的印刷位置精度 ，而了解軋製金屬箔網目構件，其印刷位置精度較金屬網 目織物更高。 接著，針對軋製金屬箔網目構件的孔部的擴大方向來 硏究。在厚度21 μιη的不鏽,鋼軋製箔在印刷物側（東洋精箔 股份有限公司製：規格S U S 3 0 4 - Η )，從單側進行蝕刻進行 開孔加工，製作軋製金屬箔網目構件。將印刷版製作成： 孔部朝向印刷面側擴大、以及將印刷版製作成孔部朝向印 刷面側變窄，進行印刷實驗。網目構件的單面的開口率爲 7 3 %，另一面的開口率爲3 7 % (兩面的開口率的平均5 5 % ) 。結果，孔部朝向印刷面側擴大的網目構件能進行良好的 印刷，可是孔部朝印刷面側變窄的網目構件’印刷模糊， 無法進行良好的印刷。根據該結果’在本發明的網目構件 ，孔部的外觀形狀形成爲朝向印刷對象物擴大° -14- 201200357 本發明者們’爲了評估軋製金屬箔網目構件的印刷性 ’也實施印刷實驗。在厚度16 μιη與21 μιη的不鏽鋼軋製箔 (東洋精箔股份有限公司製：規格SUS304-H )，從單側以 蝕刻處理進行開孔加工（孔的形狀參考後述第3圖），製 作開口部的間距與開口率不同的網目構件。從單側進行蝕 刻的結果，將蝕刻液進行噴霧側的開口率較高，相反面開 口率較低。 將該網目構件，與張設於鋁框的聚酯細線網目，接合 成讓開口率較高的面成爲印刷對象物側，製作出複合遮罩 。在塗佈感光性乳劑後，製作出印刷圖案寬度：80μπι的印 刷版。使用該印刷版與導電性銀糊劑（日本東洋墨水製造 股份有限公司製：「R AF S」）來進行印刷實驗，評估印 刷線是否模糊（斷線）。在光學顯微鏡的觀察下，在印刷 線沒有印刷模糊（斷線）時則判斷爲良好（〇），印刷模 糊時則判斷爲不良（X)。其結果顯示於下述表1(實驗 No. 1〜8 )。並且所謂下述表1所示的開口率（印刷面側的 開口率），是從印刷面側的開口寬度（孔部的開口寬度： μιη ) 2/間距（μιη ) 2x 1 〇〇 ( % )所計算出。如本發明的網目 構件，孔部的形狀朝向印刷面側（印刷對象物側）擴大’ 開口率在印刷面側與刮刀側不同。在沒有特別說明的情況 ，該網目構件的開口率，爲印刷面側的開口率與刮刀側的 開口率的平均値。 -15- 201200357 i 有無印 刷模糊 X X X 〇 〇 〇 〇 〇 mx s親 陌铖 mm m"K 0. 47 0. 42 0. 40 (O CO d 寸 CQ 〇 rH 00 o o CO o 寸 C>3 o 骧=t S< mu 胆铖 匿·Κ g® LO CQ CSJ CD CO 卜 CO lo 寸 οα 印刷面側的 開口率(％) 00 寸 S <N CD 寸 to 卜 CO 00 開口率* ,(%) t-H CO O) 寸 CO 00 in 寸 CO ΙΟ in in in σ> ΙΩ 間距 (μΐη) ιο 卜 100 ΙΛ 卜 100 § o 00 100 100 厚度 (/im) CO P-H rH <N to »H r-^ CNJ CO to rH rH rH (Μ 實驗 No. ϊ-Η CO in 00 - X * .. o 迴迎dzs^aiis 孽MRI®踏褂口ss 辱®ϋδί&:#ακ* -16- 201200357 根據印刷實驗的結果，解析影響印刷模糊的因素的結 果，將印刷面側的孔部與孔部之間的距離成爲最大的線部 最大寬度A，除以孔部與孔部的間隔（間距）B的最大線寬 係數（最大線寬係數=線部最大寬度A +間距B )，對於有 無印刷模糊情形有很大的影響，如果印刷面側的最大線寬 係數小於0.40的話，則沒有印刷模糊的情形，能進行良好 的印刷。 雖然印刷面側的開口率也有影響印刷性的傾向，而了 解即使印刷面側的開口率高到50%以上的情況，在印刷面 側的最大線寬係數在0.4以上，也會產生印刷模糊的情形 。也就是說，在軋製金屬箔進行開孔加工，藉由使糊劑穿 透的印刷圖案區域的最大線寬係數（最大線寬係數=線部 最大寬度A +間距B )小於0.40，則能印刷出不會有印刷模 糊情形的電極。 在第3圖（放大圖）顯示了本發明的網目構件的孔部 (開口部）的開口形狀。在本發明的網目構件’多數形成 的孔部的形狀（開口部形狀）’如第3圖所示的大致四角 形狀（網目構件的印刷相當區域的形狀爲格子狀）’而希 望確保開口率且保持強度。在第3圖’雖然顯示孔部2的四 個角落爲圓角化的形狀’而這種形狀的情況，線部1 a的寬 度最寬的部分成爲線部最大寬度A ’該線部最大寬度A會 影響網目構件的特性。孔部與孔部的間隔（間距）B ’如 第3圖所示，代表從孔部2的一邊到鄰接的另一孔部2的一 邊爲止的距離。 -17- 201200357 在上述第3圖，雖然開口形狀預定爲線部la相互交叉 的部分爲十字型，而也可如第4圖所示，開口形狀爲線部 la相互交叉的部分爲大致T字型。 當線部la相互交叉的部分爲大致T字型時，線部最大 寬度，會因爲方向而不同（第4圖所示的A與C)。在這種 情況，採用線部最大寬度爲最大的A，計算上述最大線寬 係數（最大線寬係數=線部最大寬度A +間距B )。並且當 測定：印刷面側的線部最大寬度A、印刷面側的孔部與孔 部的間隔（間距）時，使用鄰接的兩個孔部。 爲了使印刷膜厚度成爲定値，在印刷區域，孔部的形 狀基本爲相同形狀，以等間隔將孔部形成。可是，在藉由 印刷部位而改變印刷膜厚度的情況等，往往會藉由印刷目 的，改變孔部的大小、或改變孔部與孔部的間隔。即使在 這種情況，針對鄰接的孔部與孔部，將最大的線寬作爲線 部最大寬度A，根據該線部最大寬度A、孔部與孔部的間 隔（間距）B計算最大線寬係數（最大線寬係數=線部最 大寬度A +間距B)。 印刷面側的開口率越高，孔部與孔部的間隔（間距） 變得越小，最小爲〇。可是，在該情況，要確保刮刀面側 的線寬度而保持必要的強度。例如，在不鏽鋼且厚度爲 2 Ομηι的網目構件，當網目數爲250 (條/吋）且線部最大寬 度Α爲0時，刮刀面側的線寬度爲1 5 μιη以上較佳。印刷面 側的線寬度與刮刀側的線寬度的差，通常爲5〜30μιη程度 較佳，更佳爲10〜2〇μιη程度。而當線部最大寬度Α爲0時 -18- 201200357 ，最大線寬係數（最大線寬係數=線部最大寬度A +間距B )也成爲〇，而如上述可在刮刀面側確保線寬度，且保持 必要的強度，所以最大線寬係數（最大線寬係數=線部最 大寬度A +間距B)的下限爲0。 在上述表1顯示之中，使用沒有印刷模糊情形的實鹼 No.4〜8，製作印刷圖案寬度爲50μιη的印刷版，使用同樣 的導電性銀糊劑來實施印刷實驗，評估有無印刷模糊情形 與印刷寬度的差異情形。此時印刷寬度的差異情形’以雷 射顯微鏡（日本股份有限公司KEYENCE製：型式VK-97 00 )測定最大印刷寬度與最小印刷寬度，藉由測量其差異來 判斷。結果顯示在下述表2。 -19- 201200357 【zs 印刷寬度的 差異("m) 寸 I-H C0 in 0¾ rH ΙΟ rH r-i σ! (N ΙΟ d Η 有無印 刷模糊 〇 〇 〇 〇 〇 «3 S錄 晅赋 匿璁 m"K CO CO 6 寸 CO d CO 6 0. 30 ό 癱攻 s< mu 瞄慽 匡·Κ g® CO 卜 ΙΟ <Μ 寸 <Ν 印刷面側的 開口率(％) (N (Ο 卜 CO 卜 CO CO 間距 (μΐη) 100 〇 00 § 100 100 厚度 (μπι) rH (N CD rH »Η cq 實驗 No. 寸 ΙΟ c〇 卜 00 -20- 201200357 根據該結果，能夠如下述地考察。雖然全部的網目構 件都沒有印刷模糊的情形’而仍然認爲有印刷寬度的差異 。在印刷面側的線部最大寬度A爲3 Ομιη以上時，印刷寬度 的差異爲20μιη以上，當印刷面側的線部最大寬度爲小於 30μπι時，印刷寬度的差異比小於20μηι還要更小。也就是 說，在軋製金屬箔進行開孔加工，印刷面側的最大線寬係 數爲小於0.40，並且印刷面側的線部最大寬度Α爲小於 3 Ομιη的話，則能進行：即使印刷寬度較細，印刷寬度的差 異也較少的印刷，所以較好。 網目構件的開口率較高，同一面積單位的糊劑的穿透 量變多。這裡所謂的開口率，代表單面的開口率與其他面 的開口率的平均開口率（之後，當單面的開口率與其他面 的開口率不同時，其平均開口率僅稱爲開口率）。因此在 使用軋製金屬箔網目與高黏度糊劑的網版印刷，希望讓糊 劑穿透用的區域的開口率提高。當使用導件性銀糊劑之中 黏度較高的糊劑來進行印刷時，希望開口率爲50%以上， 更理想爲70%以上。可是，開口率太高會影響到網目構件 的強度降低，所以厚度爲15μχη的情況作至80%程度，厚度 20μηι的情況作至85%程度較佳。 爲了提升糊劑的排出性，雖然希望提高開口率，而如 上述如果開口率太高的話，剩餘的線部的剖面積會變小， 所以網目構件的強度會降低。因此，硏究了既提高開口率 也提升強度的方法》 本發明的網目構件，包含有：（1)軋製金屬箔，除 -21 - 201200357 了與印刷對象物的印刷區域相當的部分以外’具有與印刷 對象物的非印刷區域相當的部分，在與非印刷區域相當的 部分沒有開設孔部的型態、或（2)軋製金屬箔’在與印 刷對象物的印刷區域相當的部分以外，具有與印刷對象物 的非印刷區域相當的部分，在與非印刷區域相當的部分’ 以較相當於印刷區域的部分的孔部的開口率更小的開口率 ，開設有多數的孔部的型態等；這些型態是根據既提高開 口率也提升強度這樣的觀點所構成的β 本發明者們，製作出：在厚度16μιη的軋製不鏽鋼鋼箔 (東洋精箔股份有限公司製：規格SUS3 04-H)，以蝕刻處 理全面進行開孔加工的開口率爲55%的軋製金屬箔網目、 以及只有在用來將印刷圖案曝光的區域（150mmx 15 0mm) 作爲開口率55%，其週邊的開口率作爲5%的軋製金屬箔網 目。將兩種的軋製金屬箔網目以張力計（Tokyo Process Service公司製：型式STG75B)的刻度，以〇.65mm非常高 的張力黏接在，張設於鋁框的聚酯細線網目。黏接後，將 軋製金屬箔網目部分的聚酯細線網目切開，觀察軋製金屬 箔網目部分是否斷裂。觀察的結果，只有印刷圖案區域提 高了開口率的軋製金屬箔網目沒有斷裂，全面開口率相同 的軋製金屬箔網目斷裂。 根據該結果，在軋製金屬箔進行開孔加工的網目構件 ，藉由將印刷圖案用的區域（也就是，與印刷對象物的印 刷區域相當的軋製金屬箔的部分）的開口率提高，將其他 區域（也就是與印刷對象物的非印刷區域相當的軋製金屬 -22- 201200357 箔的部分）的開口率降低，則由於與印刷對象物的印刷區 域相當的部分（以下稱爲「印刷區域相當部分」）的開口 率較高，所以糊劑的排出量變多，而可達成長寬比更高的 印刷，並且由於與印刷對象物的非印刷區域相當的部分（ 以下稱爲「非印刷區域相當部分」）的開口率較低，所以 對於製作複合遮罩時的張力的耐久性可以提升。 藉由將非印刷區域相當部分的開口率降低’來提高網 目構件的強度，則可以將印刷時應力集中的與聚酯細線網 目的接合部的強度提高，所以預期能夠提升網目的使用壽 命。 在網版印刷，有時候會有印刷對象物的一部分等混入 到印刷對象物上’當印刷與刮刀接觸時，網目構件破裂’ 網目構件斷裂的情形。因此’進行實驗’比較細線（金屬 )網目織物與軋製不鏽鋼鋼箔對於混入異物的耐久性。金 屬網目織物，線徑：18μιη，厚度20μιη’開口率爲50%’軋 製不鏽鋼鋼箔其厚度爲21μιη。將其分別設置在高度3mm的 矽片上，在使刮刀通過之後，以微觀測器（日本股份有限 公司KEYENCE製：型式VHX-2000)觀察。結果’金屬網 目織物其不鏽鋼鋼線斷裂’相對的’軋製不鏽鋼鋼箱沒有 斷裂。也就是說’了解不鏽鋼鋼箔對於砂片等的混入異物 的耐久性，是較金屬網目織物更高°因此’藉由將乳製金 屬箔網目的非印刷區域相當部分的開口率降低’能預期： 非印刷區域相當部分對於混入異物的耐久性提升’即使在 印刷中混入有異物的情況’網目構件也不易斷裂。 -23- 201200357 爲了提升網目構件的強度’糊劑穿透的印刷圖案區域 的周邊的區域（非印刷區域相當部分）’開口率也可爲0% (也就是，沒有形成孔部的軋製金屬箱）°也就是’藉由 在軋製金屬范的非印刷區域相當部分不形成孔部’而成爲 有充分強度的構造。可是’因爲感光性乳劑的種類而與軋 製金屬箔的黏接性變低，所以在反覆印刷的途中可能會剝 離。因此，非印刷區域相當部分的開口率’可以考慮感光 性乳劑的黏接性（以及影響黏接性的軋製金屬箔的種類等 )來設定。 即使非印刷區域相當部分的開口率相同’當設置於非 印刷區域相當部分的孔部的至少一部分的開口寬度，大於 :設置在印刷區域相當部分的孔部的開口寬度時，則與感 光性乳劑的緊貼性提升。因此，設置在非印刷區域相當部 分的孔部的至少一部分的開口寬度，大於：設置在印刷區 域相當部分的孔部的開口寬度較佳。 在網目構件的厚度越厚，也就是印刷版的厚度越厚時 ，雖然能進行較厚的印刷，可是藉由使用於印刷的糊劑， 而網目構件的厚度太厚的話，容易產生印刷高度的高低差 異。預想該情況，藉由讓網目構件的厚度（也就是軋製金 屬箔的厚度）成爲30μπι以下，較適合進行高低差異較少的 印刷。網目構件的厚度越薄則越能容易進行高低差異較少 的印刷，而厚度小於5μιη的軋製金屬箔很難獲得，也很難 確保強度，所以網目構件的厚度爲5μιη以上較佳。其厚度 ，從確保強度的觀點來看，ΙΟμιη以上更好。 24- 201200357 另一方面，印刷版的厚度相同的情況，雖然印刷區域 相當部分的開口率越高則能進行越厚的印刷’可是提高開 口率會使網目構件的強度降低。因此，使用改變開口率而 改變強度的網目構件，以模擬網版印刷用鋁框的金屬製夾 板，將網目構件拉伸，實施負荷實驗。在該負荷實驗’在 將網目構件拉伸的狀態，使用壓縮實驗機（INSTRON公司 製），將夾於卡盤的網版印刷用聚氨酯橡膠製的刮刀，與 網版印刷時同樣地按壓於網版構件，觀察施加於網目構件 的張力、與是否承受得住刮刀的印刷壓力。 結果，當每單位寬度的拉伸強度（單位：N/cm，將進 行拉伸實驗時的斷裂荷重（N)換算爲每拉伸實驗片的寬 度lcm單位）爲20N/Cm以上時，了解網目構件不會產生斷 裂。藉此，網目構件的拉伸強度，爲20N/cm以上較佳。在 上述的拉伸實驗，從網目構件切出：寬度：15mm，標點 距離：100mm的實驗片，使用拉伸實驗機（股份有限公司 ORIENTEC製）以拉伸速度10mm/分鐘來實施拉伸實驗。 在下述表3顯示上述的結果（網目的厚度（μπι)、網 目數（條/吋）、單位寬度的最小剖面積、開口率（％ )、 印刷面側的最大線寬係數、單位寬度的拉伸強度（N/cm ) 、有無印刷模糊情形，負荷實驗結果）。在表3，負荷實 驗的評估，當網目構件的線部破裂時，網目構件全體破損 ，所以藉由目視來進行觀察，判斷網目構件的線部沒有破 裂時則爲「〇」，網目構件的線部即使有_處破裂也爲「 -25- 201200357 tcofi s瑟 mm 她菌 〇 〇 〇 〇 〇 〇 負荷 實驗 X X 〇 〇 〇 〇 mx 忌鐮 mm s-κ 寸 CO Ο 00 CO o CD CO 〇 d CO CO o CVJ CO o si CO 卜 S CO (M rH io * M-Cp □ e 踽 οα 寸 CO 00 CO l〇 O) CO lO io ^ 8 S> 侧旨 « J 酹胆 mm 0. 009 0. 012 0. 023 0. 031 0. 036 0. 055 網目數 (獅） Ο s o ιο o o in 寸 〇 in 04 0 IO 01 厚度 (βτα) CD CO CD i-H rH w oa 實驗 No. 05 o rH rH (N rH CO ?*"4 寸 r-4 winss^f nsi " -26- 201200357 在印刷區域相當部分的開口率小於2 5 %的情況’容易 產生印刷模糊的情形，所以該開口率爲25%以上較佳。網 目構件的每單位寬度的拉伸強度爲20N/cm以上較佳，所以 即使厚度不同的情況’需要至少每單位寬度的拉伸強度爲 2 0N/cm的開口率（計算上的最大開口率）以下的開口率。 實驗結果，在軋製金屬箔進行開孔加工所製作的網目構件 的每單位寬度的拉伸強度，與每單位寬度的最小剖面積（ mm2/Cm :相當於線部的剖面積）成比例。每單位寬度的最 小剖面積（mm2/cm)、與每單位寬度的拉伸強度（N/cm )的關係，顯示於第5圖（上述表3)。藉此，網目構件的 計算上的最大開口率，能以下述式子（1 )計算出。 〔數學式1〕 _2〇(N/cm) _Tf χΙΟΟ ...... Μ、 _ I軋製金屬箱的拉伸強度(Ν / mm2 )χ厚度(mm)x 10 也就是說，網目構件的開口率（印刷區域相當部分的 開口率），確保在網版印刷必要的開口率也就是25%以上 ，並且爲了確保每單位寬度的拉伸強度爲20N/Cm以上，以 上述式子（1 )計算.出的計算上的最大開口率以下較佳。 本發明的網目構件，是限定印刷區域相當部分的最大 線寬係數，也包含有用來確保強度的非印刷區域相當部分 ，針對其型態列舉出各式各樣的構造。例如，第6圖（a ) 及（b )，是顯示本發明的網目構件的形態的一個例子的 說明圖，第6圖（a )是俯視圖（非印刷區域相當部分的孔 -27- 201200357 部沒有圖示），第6圖（b)是其局部放大圖。在該型態， 網目構件10，在印刷區域相當部分11 (開口率變高的部分 )的周圍具有非印刷區域相當部分12(開口率變低的部分 )0 第7圖（a)〜（c)，是顯示本發明的網目構件的形 態的其他例子的說明圖。本發明的網目構件10，在中央部 具有一處的印刷區域相當部分11 (開口率變高的部分）， 在其周圍具有非印刷區域相當部分12 (開口率變低的部分 )(第7圖（a))，在中央部具有複數個印刷區域相當部 分11 (開口率變高的部分），在其周圍具有非印刷區域相 當部分12(開口率變低的部分）（第7圖（b))，在中央 部具有非印刷區域相當部分1 2 (開口率變低的部分），在 其周圍具有印刷區域相當部分11 (開口率變高的部分）， 在其更周圍具有非印刷區域相當部分1 2 (開口率變低的部 分）（第7圖（c))，列舉出等等各種型態。 針對在中央部具有印刷區域相當部分，在其周圍具有 非印刷區域相當部分的網目構件（軋製金屬箔網目構件） (例如上述第7圖（a ))，以有限元素法（FEM )來解析 拉伸時的應力集中。解析的結果，當平均應力爲lOOMPa時 ，網目構件的中央部爲86.8MPa，開口率較高的區域（印 刷區域相當部分）與開口率較低的部分（非印刷區域相當 部分）的交界的角落部（角度90度）爲128.3MPa’ 了解應 力集中在角落部。也就是說，當拉伸時而網目構件斷裂時 ，開口率較高的區域與開口率較低的區域的交界之中從角 -28- 201200357 落部斷裂的可能性較高》相對地，角落部的角度大於90度 (圓角化的形狀）時，角落部的應力爲l〇4.5MPa ’與角落 部爲90度的情況相比，較沒有應力集中的情形。 也就是如第8圖所示，開口率不同的區域1 1、1 2的交 界（以假想線D表示）的輪廓，藉由作成不是直角而是局 部圓角化的形狀，則可減低拉伸時的應力集中情形’可獲 得不易斷裂的網目構件。尤其即使網目構件的厚度較薄（ 3 〇μιη程度以下），提高開口率較高的區域的開口率’並且 以高張力張設時，也預期能防止斷裂。 印刷區域相當部分與非印刷區域相當部分的交界D ’ 如第8圖所示，設定爲以印刷區域相當部分的開口部的端 部爲基準，該交界D，爲計算印刷區域相當部分與該非印 刷區域相當部分的各個開口率時的基準。 當鄰接的部分（印刷區域相當部分與非印刷區域相當 部分）的開口率的差異較大時，當拉伸時應力集中於交界 D，可能從開口率較高（強度較低）的部分的線部開始斷 裂。在該情況，爲了讓在交界D的開口率（剛性）的差異 變小，設置：具有較高開口率與較低開口率的中間的開口 率的第三部分的方式也很有用。或者也可將開口率較低的 部分的開口率作成，接近較高開口率的部分則變高，較遠 則變低。 所謂本發明的網目構件的各部分，是軋製金屬箔之中 開口率相同的範圍，開口率不同的範圍爲其他部分。即使 開口率相同，而以開口率不同的部分分開的情況，則視爲 -29- 201200357 其他部分（例如複數的開口率較高的部分散佈在開口 低的部分的情況）。在朝向用來將印刷圖案曝光的開 較高的部分，漸漸改變開口率（通常是變高）的情況 個相同開口率的範圍視爲一個區域，變成朝向開口率 的區域存在有複數區域。 作爲軋製金屬箔的材料，雖然沒有特別限定，除 鏽鋼以外，以鈦或鈦合金、鎳或鎳合金、銅或銅合金 合金等能作成箔狀即可，例如列舉不鏽鋼的話 SUS304-H等，鈦合金的話則爲JISH4600 80種等，鎳 的話則爲JISCS2520 ( 1986) NCHRW1等，銅合金的 爲JISH3130 C 1 720R-H等，鋁合金的話則爲JISH4000 等。這種軋製金屬箔，一般在市面有販賣能容易取得 本發明的網目構件，藉由在軋製金屬箔進行蝕刻 成朝向印刷對象物擴大的多數的孔部較佳，在該網目 ，構成線部的至少單面爲平坦的，所以例如如第9圖 〜（c )(用來說明糊劑的充塡狀態的圖面）所示， 織有在表面具有凹凸的細線的網目相比，刮刀6的移 得更順暢（第9圖（a))，容易將糊劑7均勻地擴展I 圖（b)，並且能進行印刷膜厚度d2較厚的圖案的印 所以較佳（第9圖（c ))。而藉由具有這樣平坦的面 製作複合遮罩（周圍爲樹脂網目中央爲金屬網目的遮 時，也有容易與樹脂網目黏接的優點。而在第9圖（a (c )，也顯示了孔部2的外觀形狀形成爲朝向印刷面 第9圖（a )的下側）擴大的狀態（第9圖（a )的上側 率較 口率 ，每 較闻 了不 、鋁 則爲 合金 話則 5052 〇 ，形 構件 (a) 與編 動變 〔第9 刷， ，當 罩） )〜 側（ 爲刮 30- 201200357 刀側）。 本發明的網目構件，雖然藉由利用蝕刻處理進行開孔 加工，而在軋製金屬箔形成多數的孔部的方式較佳，而其 順序如下。首先，將軋製金屬箔張開而貼在玻璃等的表面 平坦的固定板的狀態，或者將軋製金屬箔張設於捲筒的滾 子的狀態，也就是軋製金屬箔張設成沒有皺折的狀態進行 以下的加工。首先在軋製金屬箔儘可能較薄地塗佈感光性 光阻劑，然後將描繪於遮罩的網目的開口部的圖案進行曝 光、顯像，則在軋製金屬箔形成開口部的圖案。 當製造：在印刷區域相當部分以外具有非印刷區域相 當部分，在非印刷區域相當部分以較印刷區域相當部分的 孔部的開口率更小的開口率開設有多數的孔部之網目構件 時，在軋製金屬箔塗佈感光性光阻劑之後，在描繪有印刷 區域相當部分的開口圖案的遮罩上，重疊配置有：描繪有 非印刷區域相當部分的開口圖案的遮罩，進行曝光、顯像 ，接著進行蝕刻即可，藉此以較簡單的順序，則能製造出 具有開口率較高的部分與較低的部分的網目構件。 〔實施例〕 以下藉由實施例更詳細地說明本發明，下述實施例其 性質並不是限定本發明’在適合前後敘述的主旨的範圍也 可適當地變更實施’這些都包含於本發明的技術範圍。 〔實施例1〕 -31 · 201200357 在厚度16μιη的市面販賣的不鏽鋼軋製箔（東洋精箔股 份有限公司製：規格SUS3 04-H) ’從單側以蝕刻處理進行 開孔加工，製作軋製金屬箔網目。開口率較高的區域’是 與太陽電池的表面電極圖案的形狀配合的形狀，將指叉電 極的印刷圖案進行曝光、顯像的部分，寬度：500μιη，長 度：150mm，將母線圖案進行曝光、顯像的部分，寬度： 2.4mm，長度150mm。孔部的形狀，爲開口朝向印刷面側 擴大的形狀。開口率較高的部分（印刷區域相當部分）的 印刷面側的間距爲80μιη，印刷物側的線部最大寬度A爲 2 7μηι，最大線寬係數爲0.34。開口率，開口率較高的部分 (印刷區域相當部分）爲62%，開口率較低部分（非印刷 區域相當部分）爲12 %。開口率較高的部分與較低的部分 之間的交界爲直線狀。 爲了進行比較實驗，將該網目構件與聚酯細線網目接 合，塗佈感光性乳劑之後，將指叉電極寬度1 〇〇μηι ’母線 寬度：2mm的印刷圖案進行曝光、顯像，製作出印刷版。 爲了進行比較，使用厚度：3 5μιη、線徑：16μιη，開口率 :63%，間距78μηι (網目數325 (條/吋））的不鏽鋼細線 網目織物，同樣地製作印刷版。兩者的印刷版，其感光性 乳劑的厚度都較網目構件的厚度更厚2 0μπι。使用這些印刷 版，進行使用導電性銀糊劑（日本東洋墨水製造股份有限 公司製：「R AF S」）的印刷，以雷射顯微鏡（日本股份 有限公司KEYENCE製：型式VK-9700 )測定印刷高度。將 其結果顯示在下述表4。 -32- 201200357 [表4] 印刷高度("m) 平均 最大 最小 高低差異 1*製金屬箔網 目(本發明品1) 19. 2 23. 1 17. 0 6. 1 1*製金屬箔網 目(本發明品2) 27. 3 28. 0 22, 7 5. 3 製金屬箔網 目(本發明品3) 21. 8 22. 2 15. 9 6. 3 ^製金屬箔網 目体發明品4) 23. 9 25. 3 21. 3 4. 0 金屬網目織物 (比較品） 13. 9 19. 6 11. 1 8. 5 印刷向度’在本發明品1〜4是19.2〜27·3μπι，較比較 品的13.9μηι更高’並且高低差異（最大高度一最小高度） ，本發明品是4 · 0〜6 · 3 μιη，比較品是8 · 5 μιη，本發明品的 較小。 〔實施例2〕 在厚度21μιη的市面販賣的不鏽鋼軋製箔（東洋精箔股 份有限公司製：規格SUS3 04-H )，在描繪著開口率較高的 區域的開口（網目）圖案的遮罩上，重疊著用來描繪開口 率較低的區域的圖案的薄膜遮罩而進行曝光。在顯像後， 從單側以蝕刻處理進行開孔加工，製作軋製金屬箔網目。 開口率較高的部分，是與太陽電池表面電極圖案的形狀配 合的形狀，將指叉電極的印刷圖案曝光、顯像的部分，寬 度：500μιη，長度：150mm，將母線的圖案進行曝光、顯 像的部分，寬度：2.4mm，長度：150mm。孔部的形狀， -33- 201200357 爲開口朝向印刷面側擴大的形狀。開口率較高的部分的印 刷面側的間距爲ΙΟΟμηι (網目數：250 (條/吋）），印刷 物側的線部最大寬度Α爲30μιη，最大線寬係數爲0.30。 開口率較高的部分的開口率爲66%，開口率較低部分 爲9%。開口率較高的部分與較低的部分之間的交界爲直線 或圓角化（參考上述第8圖）。使用該網目構件作成印刷 版。而感光性乳劑的厚度較網目構件的厚度更厚2 0μιη。使 用該印刷版，進行使用導電性銀糊劑（日本東洋墨水製造 股份有限公司製：「RAFS」）的印刷，而確認印刷沒有 模糊情形且高低差異爲5 μιη。 〔實施例3〕 在厚度30μηι的市面販賣的不鏽鋼軋製箔（東洋精箔股 份有限公司製：規格SUS304-H)，從單側以蝕刻處理進行 開孔加工，製作軋製金屬箔網目。開口率較高的部分，在 網目構件的中央部，爲70mmx70mm。開口率較高的部分的 間距爲200μπα，印刷物側的線部最大寬度A爲59μιη，最大 線寬係數爲0.30。孔部的形狀，爲開口朝向印刷面側擴大 的形狀。開口率較高的部分的開口率爲74%，開口率較低 的部分的間距爲300μπι (網目數85 (條/吋）），開口率爲 9%。開口率較高的部分與較低的部分之間的交界爲直線或 圓角化（參考上述第8圖）。使用該網目構件作成印刷版 。而感光性乳劑的厚度較網目構件的厚度更厚1 Ομιη。使用 該印刷版，進行實際的印刷，而確認印刷沒有模糊情形且 -34- 201200357 高低差異爲6μπι。 〔實施例4〕 在厚度20μηι的市面販賣的不鏽鋼軋製箔（東洋精箔股 份有限公司製：規格SUS304-H)，從單側以蝕刻處理進行 開孔加工，製作軋製金屬箔網目。開口率較高的部分是與 太陽電池的表面電極圖案的形狀配合的形狀，將指叉電極 的印刷圖案曝光、顯像的部分，寬度：500μιη ’長度： 15 0mm，將母線的圖案進行曝光、顯像的部分，寬度： 2.4mm，長度：150mm。開口率較高的部分的間距爲 ΙΟΟμιη (網目數：2 50 (條/吋）），印刷物側的線部最大 寬度Α爲20μπι，最大線寬係數爲0_20。爲開口朝向印刷面 側擴大的形狀。開口率較高的部分的開口率爲86% ’開口 率較低的部分的周邊爲不鏽鋼軋製箔（開口率〇% )。開口 率較高的部分與不鏽鋼軋製箔（開口率〇% )之間的交界爲 直線或圓角化（參考上述第8圖）。使用該網目構件作成 印刷版。而感光性乳劑的厚度較網目構件的厚度更厚 。使用該印刷版’進行實際的印刷’而確認印刷沒有模糊 情形且高低差異爲4Pm。 〔實施例5〕 爲了評估印刷位置精度’在厚度16μιη的市面販賣的不 鏽鋼軋製箔（東洋精箔股份有限公司製：規格SUS3 04-H ) ，從單側以蝕刻處理進行開孔加工，製作軋製金屬箔網目 -35- 201200357 。開口率較高的部分，在網目構件的中央部，爲200mmx 200mm。開口率較高的部分的間距爲80μηι (網目爲320網 目（條/吋）），印刷物側的線部最大寬度Α爲20μιη，最大 線寬係數爲0.25。 孔部，爲朝向印刷面側擴大的形狀，開口率較高的部 分的開口率爲57%，開口率較高的區域的周邊爲不鏽鋼軋 製箔（開口率〇%)。開口率較高的部分與軋製不鏽鋼箔（ 開口率0% )之間的交界爲直線或圓角化（參考上述第8圖 )。 使用該網目構件，測定印刷次數：5000次的印刷位置 。結果，從第1次開始的印刷位置起的印刷位置偏移爲± 1 5 μιη以內，比習知技術的金屬網目織物的印刷位置偏移的 ±30μιη (例如，「電子學高品質網版印刷技術」染谷隆夫 監修，2005年發行，第44頁）更少。根據該結果，了解在 軋製金屬箔進行開孔加工的網目構件，能達成高印刷精度 〇 雖然詳細參考特定的實施方式來說明本申請，而業者 可了解在不脫離本發明的精神與範圍下，可以進行各種變 更或修正。 本申請案，是根據2010年2月26日申請的日本專利申 請（日本特願2010-04 3159) ，2011年2月23日申請的日本 專利申請（日本特願2011 -0 37569)，其內容取入在此作 爲參考。 -36- 201200357 〔產業上的可利用性〕 藉由本發明的網版印刷用網目構件，將與印刷區域相 當的軋製金屬箔的部分的印刷對象物側的線部最大寬度A 、孔部與孔部的間隔B的比A/B，所規定的最大線寬係數作 適當的限定，所以可實現一種網版印刷用網目構件，即使 在使用高黏度的糊劑的情況，也能達成高低差異很少的印 刷，並且可得到高印刷位置精度，這種網版印刷用網目構 件，是以電子零件的製造爲主，對於：太陽電池的表面電 極也就是聚電用主電極（母線）或聚電用柵電極（指叉電 極）的形成非常有用。 【圖式簡單說明】 第1圖是通常使用於網版印刷的印刷版的局部放大說 明圖。 第2圖（a)〜（c)，是習知技術的網版印刷的糊劑 的充塡狀態的說明圖》 第3圖是用來說明孔部的開口形狀的放大圖。 第4圖是用來說明孔部的其他開口形狀的放大圖。 第5圖是顯兩每單位寬度的最小剖面積（mm2/cm)、 與每單位寬度的拉伸強度（N/cm )的關係的曲線圖》 第6圖（a)〜（b) ’是顯示本發明的網目構件的型 態的一個例子的說明圖。 第7圖（a)〜（c)，是顯示本發明的網目構件的形 態的其他例子的說明圖 -37- 201200357 第8圖，是顯示本發明的網目構件的形態的另外其他 例子的說明圖。 第9圖（a)〜（c)，是使用本發明的網目構件時的 網版印刷的糊劑的充塡狀態的說明圖。 【主要元件符號說明】 1 :細線 1 a :線部 2 :孔部（開口部） 3 :印刷圖案部 4 :感光性乳劑 5 :印刷版 6 :刮刀 7 :糊劑 7a :滲開 8 :印刷對象物 1 0 :網目構件 1 1 :印刷區域相當部分 ! 2 :非印刷區域相當部分 -38-201200357 VI. [Technical Field] The present invention relates to a mesh member used for screen printing, in particular, printing using a high-viscosity paste for printing on a surface electrode of a solar cell, etc. There will be cases where the printing is blurred, the difference between the height and the low is small, and it is possible to achieve printing with high printing position accuracy. [Prior Art] Screen printing is mainly based on the manufacture of electronic components such as stacked chip capacitors, and is also used for: the surface electrode of a solar cell, that is, the main electrode for the polyelectrogen (bus bar) or the gate electrode for the polyelectrole (referring to Formation of the fork electrode). In a printing plate (screen) used for screen printing, a mesh member obtained by weaving fine wires is used, and the fine wires are made of metal or resin (polyester). On the periphery of a mesh fabric (hereinafter referred to as "metal mesh fabric") in which stainless steel fine threads are woven, a printing plate of a mesh fabric (hereinafter referred to as "polyester mesh fabric") in which fine polyester threads are knitted is bonded (composite cover). The cover is also widely used. The composite cover is a part of the mesh fabric which is woven with a fine polyester thread and which is attached to the aluminum mold frame, and which is bonded to the metal mesh fabric after drying. The polyester mesh fabric is cut. Then, a photosensitive emulsion was applied, and the intended printing pattern was exposed and developed on a metal mesh fabric to prepare a printing plate. When the mesh fabric having the fine threads is the same thickness, the aperture ratio (the total area ratio of the openings shown in Fig. 1 to be described later) is increased as the amount of the paste is increased. On the surface of the solar cell -5- 201200357 Electrode printing, etc., is a metal mesh fabric using an opening ratio of 50 to 60%. For example, in the printing of the surface electrode of a solar cell, screen printing is widely used when a printing having a printing width of about 1 〇〇μηι to 2 mm is used with a high-viscosity paste (for example, Patent Document 1). However, when a metal mesh fabric is used and printed with a paste having a high viscosity, there is a problem that the mesh marks are liable to remain, and the difference in printing is likely to be different. In the case of a collecting electrode such as a surface electrode of a solar cell, if there is a difference in height difference or a portion having a low electrode height, the electric resistance becomes high, so that it is necessary to perform printing with a small difference in height. Mesh component. In the surface electrode of a solar cell, if the light receiving area becomes large and the resistance of the electrode decreases, the power generation efficiency increases. Therefore, the surface electrode increases its aspect ratio as much as possible, that is, efforts to narrow the width of the electrode and increase the height of the electrode. However, when the electrode width is narrowed to about 50 μm, the screen printing using the metal mesh fabric does not sufficiently discharge the paste, so that the height of the printed electrode tends to be low. Also, it is known that the metal mesh fabric stretches after repeated printing, and the printing position is shifted. Therefore, when printing with higher printing position accuracy is required, there is a problem that the printing plate needs to be replaced at a stage where the number of printing is still small. Fig. 1 is a partially enlarged explanatory view of a printing plate generally used for screen printing. A mesh member (mesh fabric) in which a thin wire 1 made of metal or polyester is knitted is stretched over a screen frame (not shown), and the resin 4 (photosensitive emulsion) is entirely coated and covered with a mask. Only the partial exposure of the printing -6-201200357 is performed, and the photosensitive emulsion 4 is cured. 'The photosensitive emulsion 4 which is to be printed is removed, and the printing plate 5 is produced (in the figure, 2 shows the opening of the mesh member (mesh opening) ). The resin 4 (photosensitive emulsion)' is usually 10 to more thick than the mesh member. In the screen printing 'as shown in Fig. 2 (a) to (c), by moving the blade 6, The paste 7 is filled in the mesh opening portion 2 of the print pattern portion 3 (refer to the first FIG. 1 described above), and the paste 7 is attached to the printing object 8°. After the blade 6 is passed, the tension of the printing plate is allowed. The printing plate 5 (refer to the first drawing described above) is separated from the printing object 8, and the paste 7 remains in the printing target 8 and is printed in accordance with the pattern in which the photosensitive emulsion 4 is removed. The paste 7 after printing corresponds to the mesh. The portion of the opening portion 2 is thick, and the portion corresponding to the thin wire 1 is thin (Fig. 2(b)), and is flattened (flattened) by the viscosity and surface tension of the paste 7 (Fig. 2(c) At this time, the paste 7 expands beyond the mesh opening portion 2 of the printing plate 5. The expansion of the paste is referred to as bleeding of printing (in Fig. 2(c), shown as 7a). The thickness d1 of the paste 7 to be printed on the object 8 to be printed, the thickness of the printing plate 5, and the aperture ratio of the mesh member (the total area ratio of the opening 2) It is determined that, in the case of the same printing area, the relationship between the thickness of the printing film (μπι) = the thickness of the printing plate (μπι) X and the opening ratio (%) is established. As a method of manufacturing the mesh member, it is proposed to be electroformed. A method in which nickel or the like is deposited in a mesh shape (for example, Patent Documents 2 and 3). However, it is known that a metal foil produced by electroforming may have a difference in strength, and a mesh produced by electroforming may also be used. There is a difference in strength. Although the technique of forming a mesh member by etching a metal foil such as nickel by etching or the like is considered in 201200357, a difference in strength is generated similarly to a mesh member formed by electroforming. The mesh fabric further enhances the discharge property of the paste, and a technique of using a metal mask is also proposed. For example, in Patent Document 4, a metal mask is proposed, in which the electrode on the surface of the solar cell is printed, in order to improve the discharge property of the paste, An opening is provided in the metal plate, and a support body (also referred to as a "bridge") having a smaller thickness than the metal portion is added between the openings, and the mask is held while being held. Increase the discharge of the paste. However, in this technique, in order to allow the support body portion to be associated with the printed pattern portion, when the printing width is small, the paste may not sufficiently shield the support body portion, and the printing height of the support body portion may not be sufficiently obtained. In the case of the opening portion, there is a so-called guide block shape in the shielding portion. In order to maintain the strength, it is necessary to increase the width of the support body portion or increase the number of the support body portions. The reason for the support body is that the printing is blurred. Therefore, there is a need for a screen member for screen printing, and even if a conductive silver paste is used for printing on a surface electrode of a solar cell, when a paste having a high viscosity is used, printing is not blurred, and it is difficult to leave a trace of the mesh (that is, Printing is performed with a small difference in height of the electrodes, and the printing position is highly accurate. [Prior Art] [Patent Document] Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. 2005-150540. Patent Document 2: Japanese Patent No. 3 5 1 68 No. 201200357 Patent Document 3: Japanese Patent No. 2847746 Patent Document 4: [Problem to be Solved by the Invention] The present invention has been made in view of such circumstances, and an object thereof is to provide a mesh member for screen printing, even in the case of using a paste having a high viscosity. There is no case where the printing is blurred, and printing with little difference in height can be achieved, and high printing position accuracy can be obtained. [Means for Solving the Problem] The present invention includes the following forms. (1) is a screen printing mesh member for forming a printing pattern with a photosensitive emulsion, and the screen printing mesh member is formed by rolling a metal foil and is rolled in a printing area corresponding to the printing target. The portion of the metal foil has a plurality of hole portions that are enlarged toward the printing target, and the maximum width A of the line portion on the printing object side of the portion of the rolled metal foil corresponding to the printing region, and the hole portion and the hole portion In the mesh member according to the above (1), the rolled metal foil is in a ratio corresponding to the printing area of the printing object, and the ratio of the line width of the printing object is less than 0.40. There is a portion corresponding to the non-printing area of the printing object, and no hole is formed in the portion corresponding to the non-printing area. (3) In the mesh member according to the above (1), the rolled gold-9-201200357 foil has a portion corresponding to the non-printing region of the printing target other than the portion corresponding to the printing region of the printing target. In the portion corresponding to the non-printing region, a plurality of holes are opened at an aperture ratio smaller than the aperture ratio of the hole portion corresponding to the portion of the printing region. (4) The mesh member according to any one of the above (1) to (3), wherein the portion of the rolled metal foil corresponding to the printing region has a maximum width A of a line portion on the side of the printed object side of less than 30 μm. (5) The mesh member according to any one of the above (1) to (4), wherein the thickness is 5 μm or more and 3 μm or less. (6) The mesh member according to any one of the above (2) to (5), wherein the portion corresponding to the rolled metal foil of the printing region and the portion of the rolled metal foil corresponding to the non-printing region are at the boundary The contour is at least partially rounded. (7) The mesh member according to any one of the above (1) to (6), wherein at least one side of the constituent line portion is flat. (8) The mesh member according to any one of (1) to (7) above, wherein the rolled metal foil is made of stainless steel, titanium, titanium alloy, nickel, nickel alloy, copper, copper alloy, and aluminum alloy. One of the selected groups is composed of one selected. [Effect of the Invention] The mesh member for screen printing according to the present invention can appropriately define the maximum width A of the line portion on the side of the printing object on the portion of the rolled metal foil corresponding to the printing region, and the hole portion and the hole portion. The ratio of the spacing Β(Α/Β) is -10--10-00, 00, 2012, the maximum line width factor is set, so that a mesh component for screen printing can be realized. Even in the case of using a high-viscosity paste, there is no printing. In the case of ambiguity, it is possible to achieve printing with little difference in height and high precision, and high printing position accuracy can be obtained: the mesh member for screen printing is mainly made of electronic parts. The surface electrode for solar cells is the main electrode for collecting electricity. (Bus) or the formation of a gate electrode (finger electrode) for collecting electricity is very useful. [Embodiment] The present inventors investigated the reason why the metal mesh fabric of the prior art cannot have a good thick film printing when the printing pattern is fine. A composite mask is made which combines a stainless steel fine mesh mesh fabric (thickness 35 μηι 'mesh: 3 25 (bar/吋)) with a polyester mesh to capture high-speed animated micro-observers (Japanese limited stock) Company KEYENCE system: type VW-6000) observation: using the printing line width: 80μιη screen printing process. At this time, a conductive silver paste ("RAFS" manufactured by Toyo Ink Co., Ltd., Japan) was used as the paste. As a result of the observation, particularly in the intersection portion of the metal mesh fabric, the shielding property of the paste was deteriorated, and it was judged that the paste had a tendency to remain in the hole portion (opening portion) of the printed metal mesh fabric. The reason for this phenomenon is that the printing height of the portion where the mesh fabric is present is lowered, and the difference in printing height (height difference) or the amount of the paste printed on the printing object is reduced, and the printing height is lowered. The reason why the paste remains in the hole portion is that the paste adhered to the intersection of the stainless steel thin wires is attached to the mesh together with the surrounding paste when it is separated from the screen by the influence of the surface tension - 11 - 201200357 . According to the observation results, in order to solve the problem of the metal mesh fabric, the structure in which no paste remains in the mesh is taken into consideration when the screen is removed at the time of screen printing. In order to obtain a mesh member having no intersection portion such as a metal mesh fabric, it is attempted to perform a drilling process by rolling, metal foil etching, laser processing, or jetting. As a result, it is judged that the etching method is most suitable from the viewpoints of the opening precision and the opening speed. On the other hand, when the boring process is performed by the etching process, when the boring process is performed by etching from both sides, since the convex portion is formed in the portion of the hole portion, the paste may be retained during the screen printing. Therefore, it is preferable to perform the drilling process from the one side by the etching process. As a result, the shape (appearance shape) of the hole portion is a shape that expands from one side to the other side, and by forming the hole portion to be enlarged toward the printing object, it is possible to avoid the sticking of the paste. When the outer shape of the hole portion is enlarged toward the object to be printed, the analysis is performed to determine whether or not the discharge property of the paste is different when it is perpendicular. The analysis method is a height setting method using gas-liquid two-phase non-compressive flow analysis, and the analysis software is "COMSOL Multiphysics j" manufactured by COMSOL Corporation (Sweden). The aperture ratio of the shape of the hole portion toward the object to be printed is increased. The side is 3 8%, the printing side (that is, the printing object side) is 77% (the average opening ratio of the two sides is 58%), and the vertical opening ratio, the blade side and the printing side are assumed to be 5 8 %. The thickness of the mesh member is 15 μm, and the stick holiday of the paste is set to 200 Pa·s of high viscosity. As a result of the analysis, when the appearance of the hole portion is enlarged toward the printing object, the paste is passed from the mesh member 20 msec after the blade is passed. It is completely discharged, and it is vertical when it is -12-201200357. After the blade passes 20msec, a part of the paste adheres to the printing surface side of the mesh member. When the paste holiday is set to 1 〇〇〇Pa • s, when When the appearance of the hole portion is enlarged toward the object to be printed, the paste is completely discharged from the mesh member 20 msec after the blade is passed, and is relatively vertical, and 25 msec after the blade passes. A part of the agent still adheres to the printing surface side of the mesh member, and the difference in discharge property is more remarkable. According to the analysis result, in order to perform screen printing using a high-viscosity paste, the hole portion is processed so that the appearance of the hole portion faces the printing object. The material is enlarged, and the discharge property of the paste is better than that of the processing, and the difference between the opening ratio on the printing surface side and the opening ratio on the blade surface side can be about 5 to 80%. The venting property of the present invention is preferably 20 to 50%. The inventors of the present invention have a thickness of 16 μm of rolled stainless steel foil (manufactured by Toyo Fine Foil Co., Ltd.: SUS304-H), which is etched only from one side spray. The liquid was subjected to drilling to prepare a mesh member. The interval (pitch) between the hole portion and the hole portion was 80 μm (mesh number: 320 (bar/吋)). The opening ratio of one side was 64% 'the opening ratio of the other side was 3 2% (average 48% of the opening ratio of both sides). In order to compare the discharge property of the paste with the mesh member composed of the metal mesh fabric, the same microobserver was used as the observation of the paste printing process of the metal mesh fabric. As a result, it was judged that, in the mesh member (rolled metal foil mesh member) formed by rolling a metal foil, the discharge of the paste was more average than that of the mesh member composed of the metal mesh fabric. The rolled metal foil mesh member 'there is no residual paste in the hole portion (opening portion) observed in the fine mesh fabric, and when the hole portion is enlarged toward the printing surface side, and the hole portion on the printing surface side is narrowed, No residue of -13-201200357 was found in the paste. According to the results, it was found that the discharge of the paste was uniform by the mesh member formed by the hole processing of the rolled metal foil, and after the screen printing, the opening was There is no residual paste. In order to measure the printing position accuracy of the rolled metal foil mesh member (thickness: 16 μm, pitch: 80 μmη) as described above, a reverse printing experiment was carried out. A composite mask in which the rolled metal foil mesh member and the polyester mesh fabric were joined was prepared, and after the photosensitive emulsion was applied, the test printing pattern was exposed and developed to prepare a printing plate. Using this printing plate, the printing position after 5,000 times of reverse printing was measured, and the printing position accuracy was within 15 μm. In the case of a metal mesh fabric, it is known that the printing position accuracy is about 3 Ο μηη, and it is known that the rolled metal foil mesh member has a higher printing position accuracy than the metal mesh fabric. Next, the direction in which the hole portion of the rolled metal foil mesh member is expanded is examined. In a stainless steel having a thickness of 21 μm, a rolled steel foil is etched from one side on the side of the printed matter (made by Toyo Seiki Co., Ltd.: SUS 3 0 4 - Η), and a rolled metal foil mesh member is produced. . The printing plate was produced in such a manner that the hole portion was enlarged toward the printing surface side, and the printing plate was formed so that the hole portion was narrowed toward the printing surface side, and a printing experiment was performed. The opening ratio of the one side of the mesh member was 73%, and the opening ratio of the other side was 37% (the average of the opening ratios of the two sides was 55 %). As a result, the mesh member whose hole portion is enlarged toward the printing surface side can be printed well, but the mesh member of the hole portion which is narrowed toward the printing surface side is printed and blurred, and good printing cannot be performed. According to the result, in the mesh member of the present invention, the outer shape of the hole portion is formed to be enlarged toward the object to be printed, and the inventors have performed a printing experiment in order to evaluate the printability of the rolled metal foil mesh member. In a stainless steel rolled foil (manufactured by Toyo Fine Foil Co., Ltd.: SUS304-H) having a thickness of 16 μm and 21 μm, a hole is formed by etching from one side (the shape of the hole is referred to in the third drawing), and an opening is produced. A mesh member having a different pitch and opening ratio. As a result of etching from one side, the opening ratio of the etching liquid on the spray side was high, and the opening ratio on the opposite side was low. The mesh member was joined to a polyester fine mesh which was stretched over an aluminum frame so that the surface having a high aperture ratio became the object to be printed, and a composite mask was produced. After the photosensitive emulsion was applied, a printing plate having a printed pattern width of 80 μm was produced. Using this printing plate and a conductive silver paste ("R AF S" manufactured by Toyo Ink Co., Ltd.), a printing experiment was conducted to evaluate whether the printing line was blurred (broken line). Under the observation of the optical microscope, it was judged to be good (〇) when there was no printing blur (broken line) on the printing line, and it was judged to be defective (X) when the printing was performed. The results are shown in Table 1 below (Experiments Nos. 1 to 8). In addition, the aperture ratio (opening ratio on the printing surface side) shown in the following Table 1 is the opening width from the printing surface side (opening width of the hole portion: μιη) 2 / pitch (μιη) 2x 1 〇〇 (%) Calculated. In the mesh member of the present invention, the shape of the hole portion is enlarged toward the printing surface side (printing object side). The opening ratio is different from the blade side on the printing surface side. The opening ratio of the mesh member is an average value of the opening ratio on the printing surface side and the opening ratio on the blade side, unless otherwise specified. -15- 201200357 i With or without printing XXX 〇〇〇〇〇mx s pro-m铖mm m"K 0. 47 0. 42 0. 40 (O CO d inch CQ 〇rH 00 oo CO o inch C>3 o 骧=t S < mu 胆铖 Κ·Κ g® LO CQ CSJ CD CO 卜 CO lo inch οα Opening ratio on the printing side (%) 00 inch S <N CD inch to Bu CO 00 aperture ratio*, (%) tH CO O) inch CO 00 in inch CO ΙΟ in in σ> ΙΩ spacing (μΐη) ιο 卜 100 ΙΛ 卜 100 § o 00 100 100 thickness ( /im) CO PH rH <N to »H r-^ CNJ CO to rH rH rH (Μ Experiment No. ϊ-Η CO in 00 - X * .. o Welcome dzs^aiis 孽MRI® 褂s mouth ss 辱®ϋδί&:# Κκ* -16- 201200357 According to the result of the printing experiment, the result of the factor affecting the printing blur is analyzed, and the maximum width A of the line portion which maximizes the distance between the hole portion on the printing surface side and the hole portion is divided by the hole portion and the hole. The maximum line width coefficient (maximum line width coefficient = line width maximum width A + spacing B) of the interval (pitch) B of the portion has a great influence on the presence or absence of printing blur, if the maximum line width coefficient on the printing side is less than 0.40 In the case where there is no printing blur, good printing can be performed. Although the aperture ratio on the printing surface side tends to affect the printability, it is understood that even if the aperture ratio on the printing surface side is as high as 50% or more, the printing surface side is known. The maximum line width coefficient is 0.4 or more, and printing blurring is also caused. That is to say, the maximum line width coefficient (maximum line) of the printed pattern region penetrated by the paste is performed in the rolled metal foil. Width coefficient = line width maximum width A + spacing B When the thickness is less than 0.40, an electrode which does not have a printing blur can be printed. The opening shape of the hole portion (opening portion) of the mesh member of the present invention is shown in Fig. 3 (enlarged view). The shape (opening shape) of the plurality of formed hole portions is substantially quadrangular in shape as shown in Fig. 3 (the shape of the printing-receiving region of the mesh member is in a lattice shape), and it is desirable to secure the aperture ratio and maintain the strength. 'While the four corners of the hole portion 2 are shown in a rounded shape', the widest portion of the line portion 1 a becomes the maximum width A ' of the line portion. The maximum width A of the line portion affects the mesh. Characteristics of the member: The distance (pitch) B' between the hole portion and the hole portion is as shown in Fig. 3, and represents the distance from one side of the hole portion 2 to one side of the other adjacent hole portion 2. -17- 201200357 In the third drawing, the portion in which the opening shape is predetermined such that the line portions la intersect with each other is a cross type, and as shown in Fig. 4, the portion in which the opening shape is such that the line portions la intersect each other is substantially T-shaped. The part that crosses each other is roughly T In the case of the type, the maximum width of the line will vary depending on the direction (A and C shown in Fig. 4). In this case, the maximum line width coefficient (maximum line width) is calculated using the maximum width of the line portion. The coefficient = the maximum width of the line portion A + the pitch B). When measuring the maximum width A of the line portion on the printing surface side and the interval (pitch) between the hole portion on the printing surface side and the hole portion, two adjacent hole portions are used. In order to make the thickness of the printing film constant, the shape of the hole portion is substantially the same shape in the printing region, and the hole portion is formed at equal intervals. However, when the thickness of the printing film is changed by the printing portion, it is often printed. Purpose, to change the size of the hole, or to change the spacing between the hole and the hole. Even in this case, the maximum line width is defined as the maximum width A of the line portion for the adjacent hole portion and the hole portion, and the maximum line width is calculated according to the maximum width A of the line portion and the interval (pitch) B between the hole portion and the hole portion. Coefficient (maximum line width factor = line width maximum width A + spacing B). The higher the aperture ratio on the side of the printing surface, the smaller the interval (pitch) between the hole portion and the hole portion, and the minimum is 〇. However, in this case, the line width on the side of the blade is required to maintain the necessary strength. For example, in a mesh member having a stainless steel and a thickness of 2 Ομηι, when the number of meshes is 250 (bar/吋) and the maximum width Α of the line portion is 0, the line width on the blade side is preferably 15 μm or more. The difference between the line width on the printing surface side and the line width on the blade side is usually from 5 to 30 μm, more preferably from 10 to 2 μm. When the maximum width Α of the line portion is 0: -18 - 201200357, the maximum line width coefficient (maximum line width coefficient = line width maximum width A + spacing B) also becomes 〇, and as described above, the line width can be ensured on the blade side. And the necessary strength is maintained, so the lower limit of the maximum line width coefficient (maximum line width coefficient = line portion maximum width A + spacing B) is zero. In the above-described Table 1, the printing plates having a printing pattern width of 50 μm were produced using the solid bases No. 4 to 8 in the absence of printing blur, and the printing experiment was carried out using the same conductive silver paste to evaluate the presence or absence of the printing blur. The difference from the print width. At this time, the difference in printing width was measured by a laser microscope (manufactured by KEYENCE, Japan: model VK-97 00) to determine the maximum printing width and the minimum printing width, and the difference was measured. The results are shown in Table 2 below. -19- 201200357 [zs difference in printing width ("m) inch IH C0 in 03⁄4 rH ΙΟ rH ri σ! (N ΙΟ d Η with or without printing blur 〇〇〇〇〇 «3 S recording 晅 璁 璁 m"K CO CO 6 inch CO d CO 6 0. 30 瘫 瘫 attack s < mu 慽 匡·Κ g® CO Bu ΙΟ <Μ inch <Ν aperture ratio on the side of the printing surface (%) (N (Ο CO CO CO CO Isolation (μΐη) 100 〇00 § 100 100 Thickness (μπι) rH (N CD rH »Η cq Experiment No. inch ΙΟ c〇 00 -20 - 201200357 According to the results, it can be considered as follows. Although there is no case where printing is blurred, all the mesh members are considered to have a difference in printing width. The maximum width A of the line portion on the printing surface side is 3 When Ομιη or more, the difference in printing width is 20 μm or more, and when the maximum width of the line portion on the printing surface side is less than 30 μm, the difference in printing width is smaller than that of less than 20 μm. That is, the opening of the rolled metal foil is performed. In the case of processing, the maximum line width coefficient on the side of the printing surface is less than 0.40, and the maximum width Α of the line portion on the printing surface side is less than 3 Ομιη, and printing can be performed even if the printing width is small and the difference in printing width is small. Therefore, the opening ratio of the mesh member is high, and the penetration amount of the paste of the same area unit is increased. The so-called aperture ratio here represents the average of the aperture ratio of one side and the aperture ratio of other surfaces. The mouth rate (after that, when the aperture ratio of one side is different from the aperture ratio of other planes, the average aperture ratio is simply called the aperture ratio). Therefore, it is desirable to use screen printing of rolled metal foil mesh and high viscosity paste. The opening ratio of the region for which the paste is penetrated is increased. When printing is carried out using a paste having a high viscosity among the conductive silver pastes, the aperture ratio is desirably 50% or more, more preferably 70% or more. If the aperture ratio is too high, the strength of the mesh member is lowered, so that the thickness is 15 μχη to 80%, and the thickness 20 μηι is preferably 85%. In order to improve the discharge of the paste, it is desirable to increase the opening. If the aperture ratio is too high as described above, the cross-sectional area of the remaining line portion becomes small, so the strength of the mesh member is lowered. Therefore, a method of improving both the aperture ratio and the strength is considered. The member includes: (1) a rolled metal foil, except for the portion corresponding to the printing area of the printing object, other than the portion corresponding to the printing area of the printing object, having a portion corresponding to the non-printing area of the printing object, The portion corresponding to the non-printing area is not in the form of a hole portion, or (2) the rolled metal foil 'has a portion corresponding to the non-printing area of the printing object, except for the portion corresponding to the printing area of the printing object. In the portion corresponding to the non-printing area, a plurality of apertures are formed at an aperture ratio smaller than the aperture ratio of the hole portion corresponding to the portion of the printing region; these patterns are based on increasing the aperture ratio. The inventors of the present invention have produced a rolled stainless steel foil (manufactured by Toyo Fine Foil Co., Ltd.: SUS3 04-H) having a thickness of 16 μm, and fully etched by etching. The rolled metal foil mesh having an opening ratio of 55% and a region (150 mm x 150 mm) for exposing the printed pattern only had an aperture ratio of 55%, and the opening ratio at the periphery thereof was 5% of the rolled metal foil mesh. Two kinds of rolled metal foil meshes were adhered to a polyester fine wire mesh stretched in an aluminum frame with a very high tension of 〇.65 mm on a scale of a tensiometer (manufactured by Tokyo Process Service: type STG75B). After the bonding, the polyester fine wire mesh of the rolled metal foil mesh portion was cut to observe whether or not the mesh portion of the rolled metal foil was broken. As a result of observation, only the rolled metal foil mesh having an increased opening ratio in the printed pattern region was not broken, and the rolled metal foil mesh having the same overall opening ratio was broken. According to the result, in the mesh member which is subjected to the drilling process of the rolled metal foil, the opening ratio of the region for the printing pattern (that is, the portion of the rolled metal foil corresponding to the printing region of the printing target) is improved. When the aperture ratio of the area of the rolled metal-22-201200357 foil corresponding to the non-printing area of the printing target is lowered, the portion corresponding to the printing area of the printing target (hereinafter referred to as "printing" In the case where the amount of the paste is increased, the amount of the discharge of the paste is increased, and the portion having a higher aspect ratio can be printed, and the portion corresponding to the non-printing area of the printing object (hereinafter referred to as "non-printing" The area ratio is relatively low, so the durability of the tension when fabricating the composite mask can be improved. By increasing the aperture ratio of a portion corresponding to the non-printing area to increase the strength of the mesh member, it is possible to increase the strength of the joint portion of the polyester fine-wire mesh during stress concentration during printing, and it is expected that the life of the mesh can be improved. In the screen printing, sometimes a part of the printing object or the like is mixed into the printing object. When the printing is in contact with the blade, the mesh member is broken, and the mesh member is broken. Therefore, 'experimental' was compared with the durability of the fine (metal) mesh fabric and the rolled stainless steel foil for foreign matter. A metallic mesh fabric having a wire diameter of 18 μm and a thickness of 20 μm and an opening ratio of 50%' rolled stainless steel foil having a thickness of 21 μm. They were placed on a slab having a height of 3 mm, and after passing the squeegee, they were observed with a microobserver (manufactured by Nippon Co., Ltd., KEYENCE: type VHX-2000). As a result, the metal mesh fabric had its stainless steel wire broken 'opposite' rolled stainless steel steel box without breaking. That is to say, 'Understanding the durability of the stainless steel foil for the foreign matter mixed in the sand, etc., is higher than that of the metal mesh fabric. Therefore, 'by reducing the aperture ratio of a considerable portion of the non-printing area of the dairy metal foil mesh can be expected. : The durability of the non-printing area is increased for the foreign matter mixed. Even if foreign matter is mixed in the printing, the mesh member is not easily broken. -23- 201200357 In order to increase the strength of the mesh member, the area around the printed pattern area where the paste penetrates (the non-printing area is equivalent) can also be 0% (that is, the rolled metal without the hole portion) The box) is also a structure having sufficient strength by forming a hole portion in a portion of the non-printing region of the rolled metal. However, since the adhesion to the rolled metal foil is lowered because of the type of the photosensitive emulsion, peeling may occur during the reverse printing. Therefore, the aperture ratio of a part of the non-printing area can be set in consideration of the adhesiveness of the photosensitive emulsion (and the type of rolled metal foil which affects the adhesion). Even if the opening ratio of a portion of the non-printing area is the same 'when the opening width of at least a part of the hole portion provided in the non-printing area is larger than the opening width of the hole portion provided in the corresponding portion of the printing area, the photosensitive emulsion is used The tightness of the improvement. Therefore, the opening width of at least a part of the hole portion provided in a portion corresponding to the non-printing area is larger than the opening width of the hole portion provided in a corresponding portion of the printing area. The thicker the thickness of the mesh member, that is, the thicker the thickness of the printing plate, the thicker the printing, but by using the paste for printing, and the thickness of the mesh member is too thick, the printing height is likely to occur. High and low differences. In view of this, it is preferable to make the printing having a small difference in height by making the thickness of the mesh member (that is, the thickness of the rolled metal foil) 30 μm or less. The thinner the thickness of the mesh member, the easier it is to perform printing with less difference in height, and the rolled metal foil having a thickness of less than 5 μm is difficult to obtain, and it is difficult to ensure strength. Therefore, the thickness of the mesh member is preferably 5 μm or more. The thickness thereof is better from the viewpoint of ensuring strength, ΙΟμιη or more. 24-201200357 On the other hand, in the case where the thickness of the printing plate is the same, the thicker printing can be performed although the opening ratio of a portion of the printing area is higher. However, increasing the opening ratio lowers the strength of the mesh member. Therefore, a mesh member which changes the strength by changing the aperture ratio was used to simulate a metal clip of an aluminum frame for screen printing, and the mesh member was stretched to carry out a load test. In the load test, in a state where the mesh member was stretched, a squeegee made of urethane rubber for screen printing sandwiched between chucks was pressed in the same manner as in the case of screen printing, using a compression tester (manufactured by INSTRON Co., Ltd.). The plate member observes the tension applied to the mesh member and the printing pressure of the blade. As a result, when the tensile strength per unit width (unit: N/cm, the breaking load (N) when the tensile test was performed was converted to the unit of the width per cm of the tensile test piece) was 20 N/cm or more, the mesh was understood. The member does not break. Thereby, the tensile strength of the mesh member is preferably 20 N/cm or more. In the above tensile test, a tensile test was carried out from a mesh member: a test piece having a width of 15 mm and a punctuation distance of 100 mm, using a tensile tester (manufactured by ORIENTEC Co., Ltd.) at a tensile speed of 10 mm/min. Table 3 below shows the results (mesh thickness (μπι), mesh number (bar/吋), minimum cross-sectional area per unit width, aperture ratio (%), maximum line width coefficient on the printing surface side, unit width pull) Extensive strength (N/cm), with or without printing blur, load test results). In Table 3, in the evaluation of the load test, when the line portion of the mesh member is broken, the entire mesh member is broken. Therefore, when the line portion of the mesh member is not broken, it is "〇", and the line of the mesh member is broken. Even if there is a rupture at the _, it is "-25- 201200357 tcofi s 瑟 mm her bacteria load test XX 〇〇〇〇mx 镰mm s-κ inch CO Ο 00 CO o CD CO 〇d CO CO o CVJ CO o si CO 卜 S CO (M rH io * M-Cp □ e 踽οα inch CO 00 CO l〇O) CO lO io ^ 8 S> Side intention « J 酹 mm mm 0. 009 0. 012 0. 023 0. 031 0. 036 0. 055 Number of meshes (lion) Ο so ιο oo in inch 〇 in 04 0 IO 01 Thickness (βτα) CD CO CD iH rH w oa Experiment No. 05 o rH rH (N rH CO ?*"4 inch r-4 winss^f nsi " -26- 201200357 In the case where the aperture ratio of a part of the printing area is less than 25%, the printing blur is likely to occur, so the aperture ratio is 25% or more. Preferably, the tensile strength per unit width of the mesh member is preferably 20 N/cm or more, so even if the thickness is different, it is necessary to The tensile strength per unit width is an aperture ratio of an opening ratio (calculated maximum aperture ratio) of 20 N/cm. Experimental results, per unit width of a mesh member produced by performing a drilling process on a rolled metal foil Tensile strength, which is proportional to the minimum cross-sectional area per unit width (mm2/Cm: equivalent to the cross-sectional area of the line). The minimum cross-sectional area per unit width (mm2/cm) and the tensile strength per unit width ( The relationship of N/cm) is shown in Fig. 5 (Table 3 above). Thereby, the calculated maximum aperture ratio of the mesh member can be calculated by the following formula (1). [Math. 1] _2〇( N/cm) _Tf χΙΟΟ ...... Μ, _ I tensile strength of rolled metal box (Ν / mm2 ) χ thickness (mm) x 10 That is, the opening ratio of the mesh member (a considerable part of the printing area) The aperture ratio) ensures that the required aperture ratio in screen printing is 25% or more, and in order to ensure that the tensile strength per unit width is 20 N/cm or more, the calculation is performed by the above formula (1). The maximum aperture ratio is preferably lower. The mesh member of the present invention is equivalent to the limited printing area. The maximum width of the coefficient component, also contains non-printing area to ensure that a considerable part of the strength, include a variety of configurations for which patterns. For example, Fig. 6(a) and Fig. 6(b) are explanatory views showing an example of the form of the mesh member of the present invention, and Fig. 6(a) is a plan view (hole -27-201200357 of a portion corresponding to the non-printing area). Fig. 6(b) is a partially enlarged view of the same. In this type, the mesh member 10 has a non-printing area equivalent portion 12 (a portion where the aperture ratio becomes low) around the printing portion equivalent portion 11 (portion where the aperture ratio becomes high). FIG. 7(a) to (c) Is an explanatory view showing another example of the form of the mesh member of the present invention. The mesh member 10 of the present invention has a printing portion corresponding portion 11 (a portion having a high aperture ratio) at a central portion, and a non-printing region corresponding portion 12 (a portion having a low aperture ratio) around the periphery (Fig. 7) (a)) having a plurality of printing area equivalent portions 11 (portions having a high aperture ratio) in the center portion, and having a non-printing area equivalent portion 12 (a portion having a low aperture ratio) around the center portion (Fig. 7(b) In the central portion, there is a non-printing area equivalent portion 1 2 (a portion having a low aperture ratio), and a printing portion corresponding portion 11 (a portion having a high aperture ratio) is provided around the central portion, and a non-printing portion is provided in a portion thereof. 1 2 (the portion where the aperture ratio becomes low) (Fig. 7(c)), and various other types are listed. A mesh member (rolled metal foil mesh member) having a portion corresponding to a printing region at a central portion and having a non-printing region corresponding thereto (for example, the above-mentioned Fig. 7 (a)) is analyzed by a finite element method (FEM) Stress concentration during stretching. As a result of the analysis, when the average stress is 100 MPa, the center portion of the mesh member is 86.8 MPa, the corner of the region where the aperture ratio is high (the portion corresponding to the printing region) and the portion where the aperture ratio is low (the portion corresponding to the non-printing region) The part (angle of 90 degrees) is 128.3 MPa' to understand that stress is concentrated in the corners. That is to say, when the mesh member is broken at the time of stretching, the possibility of a break from the corner -28-201200357 is higher in the boundary between the region having a higher aperture ratio and the region having a lower aperture ratio. When the angle of the portion is larger than 90 degrees (the shape of the rounded shape), the stress at the corner portion is l〇4.5 MPa', and the stress concentration is less than that in the case where the corner portion is 90 degrees. That is, as shown in Fig. 8, the contour of the boundary (indicated by the imaginary line D) of the regions 1 1 and 1 2 having different aperture ratios can be reduced by forming a shape that is not rounded but partially rounded. At the time of stress concentration, 'a mesh member that is not easily broken can be obtained. In particular, even when the thickness of the mesh member is thin (less than 3 〇μη), when the opening ratio of the region having a high aperture ratio is increased and it is stretched at a high tension, it is expected to prevent cracking. The boundary D' corresponding to a portion of the printing area corresponding to the non-printing area is set to be based on the end of the opening portion corresponding to the printing portion, which is a portion for calculating the printing area and the non-printing, as shown in Fig. 8. The reference for each aperture ratio of a considerable portion of the area. When the difference in the aperture ratio of the adjacent portion (the portion corresponding to the non-printing region of the printing region) is large, the stress concentrates on the boundary D when stretching, possibly from the portion of the portion having a higher aperture ratio (lower intensity) The department began to break. In this case, in order to make the difference in the aperture ratio (rigidity) at the boundary D small, it is also useful to provide a third portion having an aperture ratio of a middle having a higher aperture ratio and a lower aperture ratio. Alternatively, the aperture ratio of the portion having a lower aperture ratio may be made higher, and the portion near the higher aperture ratio becomes higher, and becomes lower at a longer distance. The respective portions of the mesh member of the present invention are in the range in which the aperture ratio of the rolled metal foil is the same, and the range in which the aperture ratio is different is the other portion. Even if the aperture ratio is the same and the parts with different aperture ratios are separated, it is regarded as other parts of -29-201200357 (for example, the case where the complex aperture ratio is spread in the lower opening portion). In the case where the opening ratio (usually becomes high) is gradually changed toward the upper portion for exposing the printed pattern, the range of the same aperture ratio is regarded as one region, and the region facing the aperture ratio has a plurality of regions. The material of the rolled metal foil is not particularly limited, and may be formed into a foil shape such as titanium or a titanium alloy, a nickel or a nickel alloy, a copper or a copper alloy alloy, and the like, for example, SUS304-H, etc. In the case of titanium alloy, it is JISH4600 80, etc., in the case of nickel, it is JISCS2520 (1986) NCHRW1, the copper alloy is JISH3130 C 1 720R-H, and the aluminum alloy is JISH4000. Such a rolled metal foil is generally sold on the market, and it is preferable to obtain a mesh member which can easily obtain the mesh member of the present invention, and it is preferable to form a plurality of holes which are enlarged toward the printing object by rolling the metal foil, and the wire is formed in the mesh. Since at least one side of the portion is flat, for example, as shown in Fig. 9 to Fig. (c) (the surface for explaining the state of filling of the paste), the blade is woven with a mesh having fine lines on the surface. 6 is more smoothly moved (Fig. 9(a)), it is easy to uniformly spread the paste 7 to Fig. (b), and it is preferable to print a pattern having a thick printed film thickness d2 (Fig. 9 (Fig. 9 ( c)). By forming a composite mask having such a flat surface (the periphery of the resin mesh is a metal mesh for the purpose of shielding, it is also easy to adhere to the resin mesh. In Fig. 9 (a (c), the hole is also shown). The external shape of the portion 2 is formed so as to be enlarged toward the lower side of the printing surface 9 (a) (the upper side ratio of the ninth figure (a) is higher than the mouth rate, and the aluminum is the alloy if it is not. 〇, the shape member (a) and the braiding change [9th brush, when the cover)) ~ side (for scraping 30-201200357 knife side). The mesh member of the present invention is preferably formed by forming a plurality of hole portions in a rolled metal foil by performing an opening process by an etching process, and the order is as follows. First, the rolled metal foil is opened and attached to a flat plate having a flat surface such as glass, or the rolled metal foil is stretched over the roll of the roll, that is, the rolled metal foil is stretched without wrinkles. The state is processed as follows. First, the photosensitive metal resist is applied as thin as possible on the rolled metal foil, and then the pattern drawn on the opening of the mesh of the mask is exposed and developed, and the pattern of the opening is formed in the rolled metal foil. When manufacturing: having a non-printing area equivalent portion other than a portion of the printing area, and a portion of the non-printing area opening a mesh member having a plurality of hole portions at an opening ratio smaller than an opening ratio of a corresponding portion of the printing portion, After the photosensitive metal resist is applied to the rolled metal foil, a mask in which an opening pattern corresponding to the non-printing area is drawn is superposed on the mask on which the opening pattern corresponding to the printing area is drawn, and exposure is performed. The development is followed by etching, whereby in a relatively simple order, a mesh member having a portion having a high aperture ratio and a low portion can be manufactured. [Examples] Hereinafter, the present invention will be described in more detail by way of Examples. The following examples are not intended to limit the scope of the present invention. Technical scope. [Embodiment 1] -31 · 201200357 Stainless steel rolled foil (made by Toyo Seiki Co., Ltd.: SUS3 04-H) sold in the market of thickness 16 μm. 'Opening is performed by etching from one side to produce rolling. Metal foil mesh. The region having a high aperture ratio is a shape that matches the shape of the surface electrode pattern of the solar cell, and the portion where the printed pattern of the interdigitated electrode is exposed and developed, the width: 500 μm, the length: 150 mm, and the bus bar pattern is exposed. The part of the image, width: 2.4mm, length 150mm. The shape of the hole portion is a shape in which the opening is enlarged toward the printing surface side. The portion on the printing surface side where the aperture ratio is high (corresponding portion of the printing area) has a pitch of 80 μm, the maximum width A of the line portion on the printed matter side is 2 7 μm, and the maximum line width coefficient is 0.34. The aperture ratio, the portion having a higher aperture ratio (corresponding portion of the printing area) was 62%, and the portion having a lower aperture ratio (corresponding to a non-printing area) was 12%. The boundary between the portion having a higher aperture ratio and the lower portion is linear. In order to carry out a comparative experiment, the mesh member was bonded to a polyester fine mesh, and after applying a photosensitive emulsion, a printing pattern having a finger electrode width of 1 〇〇μηι 'bus width: 2 mm was exposed and developed to prepare a printing plate. . For comparison, a stainless steel fine mesh fabric having a thickness of 3 5 μm, a wire diameter of 16 μm, an aperture ratio of 63%, and a pitch of 78 μm (mesh number 325 (bar/吋)) was used, and a printing plate was produced in the same manner. In both printing plates, the thickness of the photosensitive emulsion is thicker than the thickness of the mesh member by 20 μm. Using these printing plates, printing was performed using a conductive silver paste ("R AF S" manufactured by Toyo Ink Co., Ltd.), and printing was performed by a laser microscope (manufactured by KEYENCE, Japan: type VK-9700). height. The results are shown in Table 4 below. -32- 201200357 [Table 4] Printing height ("m) Average maximum minimum height difference 1* metal foil mesh (Invention 1) 19. 2 23. 1 17. 0 6. 1 1* Metal foil mesh (Inventive product 2) 27. 3 28. 0 22, 7 5. 3 Metal foil mesh (Inventive product 3) 21. 8 22. 2 15. 9 6. 3 ^ Metal foil mesh body invention 4) 23. 9 25. 3 21. 3 4. 0 Metal mesh fabric (comparative) 13. 9 19. 6 11. 1 8. 5 Printing dimension 'In the present invention, products 1 to 4 are 19.2 to 27·3 μπι, The comparative product has a higher density of 13.9 μm and a difference in height (maximum height to minimum height), the present invention is 4 · 0 to 6 · 3 μιη, and the comparative product is 8 · 5 μιη, and the product of the present invention is small. [Example 2] A stainless steel rolled foil (made by Toyo Fine Foil Co., Ltd.: SUS3 04-H) sold in the market with a thickness of 21 μm, a mask of an opening (mesh) pattern in a region where the aperture ratio is high is drawn. Exposure is performed by superimposing a film mask for patterning a region having a low aperture ratio. After the development, the opening process was performed by etching treatment from one side to produce a rolled metal foil mesh. The portion having a higher aperture ratio is a shape that matches the shape of the electrode pattern on the surface of the solar cell, and the portion where the printed pattern of the interdigitated electrode is exposed and developed is Width: 500 μm, length: 150 mm, and the pattern of the bus bar is exposed and displayed. The part of the image, width: 2.4mm, length: 150mm. The shape of the hole portion, -33- 201200357 is a shape in which the opening is enlarged toward the printing surface side. The pitch of the printing surface side of the portion having the higher aperture ratio is ΙΟΟμηι (the number of meshes: 250 (bar/吋)), the maximum width Α of the line portion on the printing side is 30 μm, and the maximum line width coefficient is 0.30. The opening ratio of the portion having a higher aperture ratio was 66%, and the portion having a lower aperture ratio was 9%. The boundary between the portion having the higher aperture ratio and the lower portion is straight or rounded (refer to Fig. 8 above). The mesh member is used to make a printing plate. The thickness of the photosensitive emulsion is thicker than the thickness of the mesh member by 20 μm. Using the printing plate, printing using a conductive silver paste ("RAFS" manufactured by Toyo Ink Co., Ltd.) was performed, and it was confirmed that the printing was not blurred and the difference was 5 μm. [Example 3] A stainless steel rolled foil (manufactured by Toyo Seiki Co., Ltd.: SUS304-H) sold in a market having a thickness of 30 μm was subjected to a hole-forming process by etching treatment on one side to produce a rolled metal foil mesh. The portion having a higher aperture ratio is 70 mm x 70 mm at the center of the mesh member. The portion having a higher aperture ratio has a pitch of 200 μπα, the maximum width A of the line portion on the printed matter side is 59 μm, and the maximum line width coefficient is 0.30. The shape of the hole portion is a shape in which the opening is enlarged toward the printing surface side. The portion having a higher aperture ratio has an aperture ratio of 74%, and the portion having a lower aperture ratio has a pitch of 300 μm (mesh number 85 (bar/吋)) and an aperture ratio of 9%. The boundary between the portion having the higher aperture ratio and the lower portion is straight or rounded (refer to Fig. 8 above). The mesh member is used to make a printing plate. The thickness of the photosensitive emulsion is 1 Ομιη thicker than the thickness of the mesh member. Using the printing plate, the actual printing was performed, and it was confirmed that the printing was not blurred and the difference between -34 and 201200357 was 6 μm. [Example 4] A stainless steel rolled foil (manufactured by Toyo Seiki Co., Ltd.: SUS304-H) sold in a market having a thickness of 20 μm was subjected to a hole-forming process by etching treatment on one side to produce a rolled metal foil mesh. The portion having a higher aperture ratio is a shape that matches the shape of the surface electrode pattern of the solar cell, and the portion of the printed pattern of the interdigitated electrode is exposed and developed, and has a width of 500 μm η 'length: 150 mm, and the pattern of the bus bar is exposed. The part of the image, width: 2.4mm, length: 150mm. The pitch of the portion having a higher aperture ratio is ΙΟΟμιη (number of meshes: 2 50 (bars/吋)), and the maximum width Α of the line portion on the printed matter side is 20 μm and the maximum line width coefficient is 0_20. The shape in which the opening is enlarged toward the printing surface side. The opening ratio of the portion having a high aperture ratio is 86%. The periphery of the portion having a low aperture ratio is a stainless steel rolled foil (opening ratio 〇%). The boundary between the portion having a higher aperture ratio and the stainless steel rolled foil (opening ratio 〇%) is straight or rounded (refer to Fig. 8 above). The mesh member is used to make a printing plate. The thickness of the photosensitive emulsion is thicker than the thickness of the mesh member. Using the printing plate 'for actual printing', it was confirmed that the printing was not blurred and the difference was 4 Pm. [Example 5] In order to evaluate the accuracy of the printing position, a stainless steel rolled foil (made by Toyo Seiki Co., Ltd.: SUS3 04-H) sold in the market of a thickness of 16 μm, was subjected to drilling treatment from one side by etching treatment. Rolled metal foil mesh -35- 201200357. The portion having a higher aperture ratio is 200 mm x 200 mm at the center of the mesh member. The portion having a higher aperture ratio has a pitch of 80 μm (mesh is 320 mesh (bar/吋)), and the maximum width Α of the line portion on the printed matter side is 20 μm, and the maximum line width coefficient is 0.25. The hole portion has a shape that expands toward the printing surface side, and the opening ratio of the portion having a high opening ratio is 57%, and the periphery of the region having a high opening ratio is a stainless steel rolled foil (opening ratio 〇%). The boundary between the portion having a higher aperture ratio and the rolled stainless steel foil (opening ratio 0%) is straight or rounded (refer to Fig. 8 above). Using this mesh member, the number of times of printing was measured: 5,000 printing positions. As a result, the printing position shift from the printing position at the first time is within ±15 μm, which is ±30 μm offset from the printing position of the conventional metal mesh fabric (for example, "electronic high-quality screen printing" The technology was supervised by N. Takashi, released in 2005, p. 44). According to the result, it is understood that the mesh member which is subjected to the drilling process of the rolled metal foil can achieve high printing precision. Although the present application will be described in detail with reference to the specific embodiments, it will be understood by those skilled in the art without departing from the spirit and scope of the invention , you can make various changes or corrections. This application is based on a Japanese patent application filed on Feb. 26, 2010 (Japanese Patent Application No. 2010-04 3159), filed on Feb. 23, 2011, the Japanese Patent Application No. 2011-0 37569 The incorporation is hereby incorporated by reference. -36-201200357 [Industrial Applicability] With the mesh member for screen printing of the present invention, the maximum width A of the line portion on the side of the object to be printed on the portion of the rolled metal foil corresponding to the printing region, and the hole portion and The ratio A/B of the interval B of the hole portion is appropriately limited by the specified maximum line width coefficient, so that a mesh member for screen printing can be realized, and even in the case of using a high-viscosity paste, a difference can be achieved. Very little printing, and high printing position accuracy can be obtained. This screen printing mesh member is mainly for the manufacture of electronic parts. For the surface electrode of solar cells, it is the main electrode (bus bar) or poly. The formation of an electric gate electrode (finger electrode) is very useful. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partially enlarged explanatory view of a printing plate generally used for screen printing. Fig. 2(a) to Fig. 2(c) are explanatory views of the state in which the paste of the screen printing of the prior art is filled. Fig. 3 is an enlarged view for explaining the shape of the opening of the hole. Fig. 4 is an enlarged view for explaining the shape of another opening of the hole portion. Fig. 5 is a graph showing the relationship between the minimum cross-sectional area per unit width (mm2/cm) and the tensile strength per unit width (N/cm). Fig. 6 (a) to (b) 'is An explanatory diagram showing an example of the form of the mesh member of the present invention. (a) to (c) of FIG. 7 are explanatory diagrams showing another example of the form of the mesh member of the present invention. FIG. 37 - 201200357 FIG. 8 is an explanatory view showing still another example of the form of the mesh member of the present invention. . Fig. 9 (a) to (c) are explanatory views of the state in which the paste of the screen printing is filled when the mesh member of the present invention is used. [Description of main component symbols] 1 : Thin line 1 a : Line part 2 : Hole part (opening part) 3 : Printing pattern part 4 : Photosensitive emulsion 5 : Printing plate 6 : Scraper 7 : Paste 7a : Seepage 8 : Printing Object 1 0 : Mesh member 1 1 : A considerable portion of the printed area! 2 : A non-printed area equivalent - 38-