200941510 .六’發明說明： 【發明所屬之技術領域】 本發明係關於屏蔽扁平電纜及其製造方法，其將複數 根導體平行一行地排成並以絕緣體包覆，其外側則以共通 之屏蔽導體包覆。 - 【先前技術】 . 對電子機器內之配線或機器可動部的配線，爲了能節 省空間及進行簡便之連接，可使用具可撓性之扁平電纜。 D 另外，因機器之使用頻率越高則雜訊之影響越大，所以， 採用經屏蔽之屏蔽扁平電纜。屏蔽扁平電纜通常係將平角 或圓形之導體以預定間隔排列成一行，並由電性絕緣樹脂 所構成之絕緣體將其整體形成一體。另外，由共通之導電 體來包覆絕緣體的外側而構成屏蔽導體，並依需要而構成 爲由樹脂外被來保護其外側的形狀（例如，參照日本特開平 8-64 037號公報、特開2003-16849號公報）。 習知之屏蔽扁平電纜，爲了在電纜終端部將屏蔽導體 〇 連接於連接器或電路基板之接地端子而使用地線（drain " wire)。地線通常係在包覆屏蔽扁平電纜之絕緣體的屏蔽導 • 體之內側，以接觸遍及電纜之長度方向全長的方式配設。 在屏蔽扁平電纜之終端部，雖爲了與連接器或電路基板之 端子部連接，而屏蔽導體與外被一起被除去，但屏蔽導體 藉由上述之地線而與屏蔽端子接地連接。 屏蔽導體與地線雖沿軸方向線狀地電性接觸，但其接 觸面積爲地線之表面積的一半以下。而且，因爲利用屏蔽 導體之捲附或外被的包覆而獲得接觸狀態，所以具有電性 200941510 •接觸不夠充分的情況，恐有屏蔽導體的接地可靠度下降之 虞。另外，在電纜終端部，因屏蔽導體被除去，所以在此 屏蔽導體被除去之區域部分，恐有引起阻抗的不匹配之 虞。另外，因屏蔽功能降低，所以具有信號傳輸不穩之問 題。 - 【發明内容】 . 本發明係鑒於上述實情而完成發明者，其提供一種屏 蔽扁平電纜及其製造方法，可確實地進行屏蔽導體之接地 〇 連接，且防止除去屏蔽導體而造成之阻抗不匹配，並抑制 屏蔽效果的降低。 (解決課題之手段） 本發明之屏蔽扁平電纜，係在將複數根導體平行一行 地排成並由絕緣體包覆成一體的扁平電纜之至少一面，縱 向添設接地連接用之金屬箔帶，且金屬箔帶及絕緣體係由 屏蔽用之金屬箔片所包覆。 接地連接用之金屬箔帶可配置於扁平電纜之兩面，而 〇 黏著於絕緣體上亦可。另外，在接地連接用之金屬箔帶僅 ^ 配置於該扁平電纜的一面的情況，可在扁平電纜之另一面 • 黏著屏蔽用之金屬箔片。又，爲了接著絕緣體與接地連接 用之金屬箔帶，或是絕緣體與屏蔽用之金屬箔片，以網紋 鋼板之模樣塗布黏著劑較佳。又，絕緣體係藉由擠壓成型 而形成爲表面無凹凸之平坦面較佳。 另外，屏蔽用之金屬箔片的外側係由外被所包覆，可 作爲保護整根電纜之構成。外被以擠壓成型而形成較佳， 此情況時，屏蔽用之金屬箔片係由樹脂層及金屬箔層構 200941510 > *成，且設成在外側樹脂層與外被黏著較佳。 另外，若電纜不具有外被，則屏蔽用之金屬箔片被捲 附於絕緣體上達1.5圈以上且具有難燃性，若外被具有外 被之電纜，則外被係由聚胺基甲酸酯樹脂與乙烯-醋酸乙烯 共聚物樹脂之混合樹脂所形成，且具有難燃性。 , 此外，在絕緣體內添加有0.4重量％〜0.6重量％之碳 ^ 黑，以便使藉由YAG雷射而電纜終端進行之金屬箔的加工 變容易。亦可在電纜之折彎部位具安裝有彎曲調節構件之 0 構成，該構件具比屏蔽用之金屬箔片不會被切斷之最小彎 曲半徑還大的彎曲半徑。 另外，該屏蔽用之金屬箔片的捲繞終端部亦可被彎曲 三次以上。另外，該絕緣體亦可爲非難燃性之樹脂。 另外，該接地連接用之金屬箔帶具有內外貫穿之複數 個通氣孔，而該絕緣體被交聯亦可。另外，該外被交聯亦 可。 本發明之屏蔽扁平電纜的製造方法，其將複數根導體 0 平行一行排成並由絕緣體包覆成一體而形成爲扁平電纜， ^ 在該扁平電纜之至少一面縱向添設接地連接用之金屬箔 * 帶，並由屏蔽用之金屬箔片來包覆該金屬箔帶及絕緣體。 又，亦可由外被來包覆該金屬箔片。在交聯時，於金屬箔 帶開孔。 另外，亦可使用具有內外貫穿之複數個通氣孔的金屬 帶，從該金屬箔帶之外側照射電離放射線而將該絕緣體進 行交聯。 另外，可以金屬箔片包覆具有內外貫穿之複數個通氣 200941510 孔的金屬帶，亦可以外被來包覆該金屬箔片。又，亦可從 該外被之外側照射電離放射線而將該外被及該絕緣體進行 交聯。 (發明效果） 根據本發明，由於接地連接用之金屬箔帶與屏蔽用之 . 金屬箔片係平面式之面接觸，所以可有確實的電性接觸， 且接觸面積亦大。對使接地棒接觸於接地連接用之金屬箔 .· 帶者亦相同。藉此，可確實進行屏蔽用之金屬箔片的接地 q 連接。另外，即使在電纜終端部除去屏蔽用之金屬箔片的 情況，由於接地連接用之金屬箔帶仍處在電纜終端，所以 可防止阻抗的不匹配，且可減輕屏蔽功能之降低，而確保 信號傳輸之穩定信及可靠度。 另外，在將金屬箔片之捲繞終端部彎曲三次以上的情 況，即使金屬箔片內側之絕緣體被高溫加熱而產生氣體， 氣體仍不會從貼合有金屬箔片之捲繞終端部洩漏至外部。 另外，即使在屏蔽扁平電纜之外側具有火焰，仍可藉由金 Q 屬箔片來遮斷火焰，可防止火焰進入內部。因此可確保高 ~ 難燃性。 ' 另外，在藉由電離放射線之照射而將絕緣體進行交聯 的情況，被賦予良好之耐熱性。而且，在金屬箔帶形成有 內外貫穿之複數個通氣孔的情況，對絕緣體照射電離放射 線而進行交聯時所產生的氫氣，不會殘留於絕緣體與金屬 箔帶之間而被釋出。藉此，可防止金屬箔帶從絕緣體浮起。 另外，可消除阻抗部分增高而產生尖峰信號等之阻抗的失 真，可達成爲目標値之阻抗。 200941510 【實施方式】 參照圖面說明本發明之實施形態。圖中，la〜lh表示 屏蔽扁平電纜，2a、2b表示導體，3表示絕緣體，4表示金 屬箔片（屏蔽導體），4a表示金屬箔層，4b表示樹脂層，4c 表示黏著劑，5表示外被，6表示金屬箔帶（接地連接用導 體），7表示接地棒。 本發明之一實施形態的屏蔽扁平電纜la，如第1圖所 示，例如，將截面爲平角之導體2a平行一行地排列，並藉 由絕緣樹脂所構成之絕緣體3以使此等導體相互電性絕緣 地方式包覆成一體。在絕緣體3之平坦兩面的至少一面， 縱向添設作爲接地連接用導體之金屬箔帶6，以包覆此金 屬箔帶6及絕緣體3之外周全面的方式，捲繞作爲屏蔽導 體之金屬箔片4。 接地連接用之金屬箔帶6係採用可全部覆蓋排列成行 狀之導體2a的寬度者，並縱向添設於絕緣體3之一面或兩 面。屏蔽用之金屬箔片4係以包覆絕緣體3及金屬箔帶6 整體的方式進行捲繞，並設成在重疊部分封閉。金屬箔片 4與金屬箔帶6係配置成彼此之金屬箔面接觸。因接觸面 寬廣，所以可成爲良好之電性導通狀態。 屏蔽扁平電纜la係藉由作爲屏蔽導體之金屬片4，對 來自外部之雜訊總括地進行屏蔽，並用以屏蔽朝外部雜訊 之放射。屏蔽用之金屬箔片4係採用厚度爲0.01 mm〜 0.05 mm者，可採用由銅或鋁等之金屬箔的單體所構成之金 屬箔片。另外，如第1(b)圖所示，金屬片4係將金屬箔層 疊或蒸鍍於樹脂片上而形成，可採用由金屬箔層4a(7 m 200941510 ‘〜25"m)及樹脂層4b(4ym〜25//m)所構成之金屬箔片。 又’金屬箔片4之樹脂片基材，例如可採用聚對苯二甲酸 乙二酯（PET)。 在採用由金屬箔層4a及樹脂層4b所構成之層疊形狀 者作爲金屬箔片4的情況，其係以金屬箔層4a爲內側而樹 - 脂層4 b爲外側進行捲繞，且至少相重疊之部分係由黏著劑 . 4c所黏著固定。藉此，金屬箔片4之金屬箔層4a可直接接 觸於配置於內側之接地連接用的金屬箔帶6而與其電性連 ❹ 接。另外，因樹脂層4b成爲外側，金屬箔層4a未露出， 所以，即使無外被，仍可保持作爲電纜之一定範圍的耐久 性。 另外，配設於絕緣體3與金屬箔片4之間而作爲接地 連接用導體之金屬箔帶6，與屏蔽用之金屬箔片4相同， 亦可採用將金屬箔層疊於樹脂片上以增強強度者。金屬箔 帶6係以金屬箔層成爲外側之方式被添設而接觸於絕緣體 3的一面或兩面，並藉由金屬箔片4之捲附所保持。屏蔽 Q 用之金屬箔片4與接地連接用之金屬箔帶6的金屬箔彼此 " 間，係以金屬箔帶之大致全部面積進行接觸，所以可成爲 ' 低電阻且良好之電性連接。 絕緣體3係用以將導體2a之間電性絕緣，而對於在高 頻區域的使用，係介設於導體2a間及金屬箔片4(或金屬箔 帶6)之間，作爲形成靜電耦合之電容器的介電質而發揮功 能。絕緣體3之損耗因數及相對介電常數之任一方，均是 較低者的信號傳輸損失較小，而可有效地傳輸高頻信號。 但爲了與機器進行連接，需要藉由介電質材料之相對介電 200941510 •常數來決定尺寸，以實現所需之阻抗。 形成絕緣體3之樹脂，可採用聚酯、聚氯乙烯等，但 以聚烯烴系之樹脂爲較佳，例如，可採用聚乙烯樹脂等。 聚乙烯樹脂的損耗因數爲4x1 0·4左右，相對介電常數爲2.3 〜2.4，其比聚酯樹脂（例如，PET的損耗因數爲2xl0·3，相 - 對介電常數爲2.9〜3.0)還小，故可謂是較佳之材料。 . 如上述而構成之屏蔽扁平電纜la，在與連接器或電路 基板之端子部連接時，需要在終端部露出導體2a及接地連 @ 接用之金屬箔帶6。採用C〇2雷射、YAG雷射等，切入屏 蔽用之金屬箔片4的終端部，並除去此部分以使接地連接 用之金屬箔帶6露出。接著，採用YAG雷射來除去金屬箔 帶6之前端部分，以使絕緣體3全面露出。又，利用CCh 雷射來切斷除去絕緣體3,以使內部之導體2a露出（省略圖 示），並在保持導體2a之排列間距的狀態下連接於連接器 等之端子部。 如上述而形成之終端部，至少在一面側露出接地連接 〇 用之金屬箔帶6，並以橫切金屬箔帶6之寬度方向的方式 ' 配置接地棒7,以使金屬箔帶6與接地棒7接觸。接地棒7 ' 被連接於連接器之接地端子部分。接地連接用之金屬箔帶 6與接地棒7係面接觸，所以可進行連接狀態之固定保持， 可確保確實且穩定之電性連接。 另外，作爲屏蔽導體之金屬箔片4，爲了與連接器等 之連接，在終端部附近成爲被除去之狀態，但接地連接用 之金屬箔帶6因需接地連接而被保留。因此，隔著在導體 2a與金屬箔片4間之間的絕緣體3的靜電電容及外部阻抗 200941510 •被均勻保持，不會在此部分產生阻抗的不匹配。另外，因 在終端部附近之屏蔽用的金屬箔片4被部分除去而造成之 屏蔽功能的降低，亦藉由接地連接用之金屬箔帶6而可得 到減輕，可提高對雜訊之可靠度。 第2圖所示之屏蔽扁平電纜lb，係由外被5來包覆上 - 述屏蔽扁平電纜la之金屬箔片4的外側者。有關由外被5 . 包覆之構成以外的部分，與第1圖中說明之構成基本相 同，故而省略詳細說明。 p 外被5用以保護整根電纜包括金屬箔片4，並具備補 強其機械強度而能承受彎曲等之功能。外被5之被覆厚度 約爲0.2 mm，可由與絕緣體3相同之聚氯乙烯、聚乙烯或 後述之聚胺基甲酸酯樹脂與乙烯-醋酸乙烯共聚物樹脂之 混合樹脂等所形成。另外，外被5可爲以包覆屏蔽導體4 之方式從兩面挾持具有黏著層的樹脂帶而黏著爲一體，亦 可藉由擠壓機的擠壓成型來形成。 在採用具有外被5，且由金屬箔層與樹脂層所構成之 〇 屏蔽用的金屬箔片4之情況，金屬箔片4係以金屬箔層4a ' 爲內側而樹脂層4b爲外側進行捲繞。在由絕緣樹脂之擠壓 ' 成型來形成外被5的情況，外側之樹脂層4b的部分，係藉 由成型時之熱而與外被5融合爲一體。當外被5、金屬箔 片4之樹脂層4b融合爲一體時，在終端部之形成時將外被 5除去之際，金屬箔片4亦被一起除去，可提高作業性。 第3圖爲本發明之其他屏蔽扁平電纜的截面之示意 圖。第3(a)圖爲無外被，且採用平角之導體2a，而僅於電 纜之一面配置金屬箔帶6之例子。第3(b)圖爲有外被，且 -10- 200941510 ‘採用圓形之導體2b，而於電纜之兩面配置金屬箔帶6之例 子。 第3(a)圖之屏蔽扁平電纜lc的平角導體2a，例如可採 用鍍錫軟銅箔。將導體厚度爲〇.〇3 5〜0.1mm，導體寬度爲 0.3mm〜0.8mm者，以〇.5mm〜1.25mm之導體排列間距，平 - 行一行地排列於寬度方向，並由絕緣體3包覆爲一體。 /第3(b)圖之屏蔽扁平電纜Id的圓形導體2b，可採用施 以鍍錫或鍍銀之捻線或單心線。從可燃性之觀點考慮以捻 @ 線爲較佳。捻線可採用相當於AWG28〜AWG40之截面積 者，例如可採用捻搓7根（相當於AWG34號）之外形0.06mm 的導線者。導體之排列間距雖亦係依據信號電壓或圓形導 體2b之粗細，但在使用該捻線之情況，可約爲0.3 mm〜 0.5mm 0 絕緣體3之被覆厚度，可依照絕緣樹脂材之介電常數 及電纜之特性阻抗而決定。雖絕緣體3可爲從兩面挾持將 具有黏著層之樹脂帶排列成行狀的導體2a、2b而一體化 〇 者，但以藉由擠壓機之擠壓成型所形成爲較佳。在擠壓成 型之情況，可將絕緣體3之兩面作成無凹凸的平坦面，所 • 以，在金屬箔帶6或金屬箔片4之積層部分不會產生凹凸， 可形成導體2a、2b之間的分布容量爲一定且均勻之阻抗。 第4圖爲有關金屬箔片4及金屬箔帶6的黏著的實施 形態之說明圖。第4(a)圖爲本發明之黏著劑的供給形態的 一例之說明圖’第4(b)圖爲有關金屬箔片及金屬箔帶的黏 著部與非黏著部的說明圖。圖中，8表示黏著條紋，8a、8b 表不短桿形之黏著條紋’ 9表示黏著面，表示非黏著面。 -11- 200941510 ’ 金屬箔片4或金屬箔帶6,如第1至第3圖之構成例中 之說明’以與導體2a、2b之間隔距離被保持一定，於電纜 全長可獲得均勻之特性阻抗爲較佳。尤其是在無外被5之 電纜中，以金屬箔片4及金屬箔帶6被黏著於絕緣體3而 成爲一體爲較佳。但是，以金屬箔片4及金屬箔帶6未被 - 相互黏著而成爲電性接觸狀態爲較佳。黏著劑被供給相互 . 黏著之金屬箔片4與絕緣體3的任一方之黏著面、及金屬 箔帶6與絕緣體3的任一方之黏著面。又，黏著劑例如可 ϋ 使用聚酯系之黏著劑。 此等黏著不需要在整個面上相同地黏著。因此，可在 黏著面以斑馬線狀、格子狀、圓點狀、網紋鋼板狀等的種 種形態來塗布黏著劑而予以黏著。但是，依此等塗布形狀 或塗布狀態，會產生各種之問題。例如，如第4(b)圖所示， 將金屬箔帶6與絕緣體3之黏著面9及非黏著面10設成斜 條紋狀。在此情況時，例如當沿非黏著面1 0之Ν-Ν線進行 折彎時，金屬箔帶6會成爲在非黏著面10浮起的狀態，造 〇 成電纜之阻抗發生變化。又，在此狀態下，當反複彎曲時， ' 會產生折痕，而恐有金屬箔發生破斷之虞。 ' 因此，以無論在哪一方向折彎，都以必定存在有黏著 條紋的黏著劑之塗布形態爲較佳。對此已判明以塗布成如 第4(a)圖之作爲止滑用之鋼板而熟知的網紋鋼板（亦稱網紋 鋼板）的模樣爲較佳。此網紋鋼板模樣之黏著條紋8，係將 正交之短桿狀黏著條紋8a、8b交錯地排列，並使全體傾斜 於長邊方向或寬度方向。例如，將一片黏著條紋8a、8b之 寬度設爲約0.5mm，長度設爲約4.5mm，以任意之密度塗 -12- 200941510 •布於絕緣體3之黏著面或金屬箔帶6或金屬箔片4側的黏 著面。根據網紋鋼板模樣之黏著條紋，不會產生直線狀之 非黏著面10，亦不會有金屬箔帶6或金屬箔片4呈筋狀浮 起的情況。 另外，近年來，對具備難燃性之電纜的要求很高。第 - 5圖爲顯示提高本發明之電纜的難燃性的構成例之示意 . 圖。在第1圖所示無外被之電纜中，在金屬箔片4之捲繞 重疊部分，係藉由黏著而保持捲繞狀態的狹窄重疊。然而， φ 若金屬箔片4之捲繞重疊量少時，則會由於燃燒使重疊部 分之黏著劑4c被融解。於是，帶內側之絕緣體從此重疊部 分被氣化而洩出，而此氣化部分之燃燒助長了電纜的延燒。 因此，如第5圖所示之屏蔽扁平電纜le，以增大金屬 箔片4之捲繞重疊部分爲較佳。試驗之結果，當捲繞1.5 圈之金屬箔片4並從金屬箔片4的捲繞側使火燄接觸時， 可抑制燃燒氣體之洩漏。因此，以金屬箔片4被捲繞於絕 緣體3之外周達1.5圈以上，且將捲繞之重疊部分設爲0.5 〇 捲繞量以上爲較佳。另外，在金屬箔片4之金屬箔是鋁箔 * 的情況，在7 w m之厚度，會被開孔，使得難燃性試驗成爲 • 不合格，而需要有10//m之厚度。而在銅箔之情況，在7 /zm之厚度’難燃性試驗成爲合格。因此，爲了減薄金屬 箔片4且提高難燃性，以使用銅箔片爲較佳。 另外’在具有第2圖之外被5的電纜中，藉由將難燃 性者用作外被材料，可提高難燃性。作爲難燃性之外被， 習知可採用添加了鹵素系難燃劑之難燃聚乙烯或聚氯乙烯 樹脂’但從環境問題考慮，對不包含鹵素之無鹵素的難燃 -13- 200941510 “注電纜的要求增高。在本發明中，作爲電纜之外被5，採 用由聚胺基甲酸酯樹脂與乙烯-醋酸乙烯共聚物（EVA)樹脂 之混合樹脂（例如，參照日本特開2008-117609號公報），以 實現電纜之難燃化。 聚胺基甲酸酯樹脂與EVA樹脂，係以重量比爲40 : 60 - 〜90: 10，EVA之VA含有率爲50〜90重量％爲較佳。以 - 相對於100重量部之此混合樹脂，含有40〜250重量部之 氫化鎂或氫化鋁等之金屬氫氧化物爲較佳。在由難燃性之 φ 外被5來包覆金屬箔片4的情況，金屬箔片4可一部分重 在形成連接器之連接等用的終端時，屏蔽用之金屬箔 片4的金屬箔，以使用YAG雷射進行切斷爲較佳。又，對 於絕緣體3之切斷，通常可採用C〇2雷射。但當絕緣體3 爲透明或自然色時，在由YAG雷射切斷金屬箔時，會有使 得絕緣體3之內部的導體劣化的情況。另一方面，當將絕 緣體3著色而難以透過yag雷射時，將會變得不容易藉由 〇 匚〇2雷射進行絕緣體3的切斷。 在本發明中，以於絕緣體3添加碳黑，以使絕緣體3 ' 之顏色成爲淺黑色爲較佳。又，碳黑之添加量，以約 〇-5wt%(〇.4重量％〜〇.6重量％)爲較佳。若是採此程度之碳 黑的添加量的話，YAG雷射不容易對內部之導體2a產生影 響’可僅切斷金屬箔片4。另外，可藉由C〇2雷射確實地切 結絕緣體3。 另外，在具有屏蔽用之金屬箔片4的扁平電纜中，與 有無外被5無關，當極端地折彎（最小彎曲半徑以下的彎曲） -14- 200941510 '時，會有在金屬箔片4的金屬箔層4a產生龜裂或被切斷的 情況。因此，期盼以電纜不會以預定之彎曲半徑以下的半 徑被彎曲的方式，在被折彎之部位具有彎曲調節手段，其 使該電纜之彎曲半徑比該金屬箔片4不會切斷之最小彎曲 半徑還大。 • 本發明中，在電纜不會在預定的曲徑以下彎曲之情 . 形，將彎曲調節構件以黏著等方式設置於預想有彎曲之部 位。彎曲調節構件可由圓筒、圓柱、半圓筒、半圓柱之棒 0 狀構件所形成。又，此等之彎曲調節構件的彎曲面之半徑， 例如，相對於電纜之90度的彎曲，彎曲半徑可約爲1.5mm， 而相對於電纜之180度的彎曲，彎曲半徑可約爲2.5mm。 如上述而構成之屏蔽扁平電纜，具有能抑制朝外部之 電磁放射、並能抑制來自外部機器之電磁放射的屏蔽功 能，可應用於使用高頻信號之電子機器的配線或可動部之 配線。另外，亦可將導體全部用作爲信號線，亦可將一部 分用作爲電線。另外，亦可用作爲差動傳輸用之電纜，此 Q 差動傳輸的電纜係爲了能以高速進行數位資料等之信號的 ' 傳輸，而使用一對信號線以逆相位進行資料信號傳輸的電 - 纜。在用作爲差動傳輸用之電纜的情況，可將相鄰之一對 導體作爲信號線，並將兩側之導體作爲接地導體，而在防 止與相鄰之信號線的串擾的形態下使用。 第6及第7圖顯示本發明之其他實施形態的屏蔽電纜 1 f之終端部附近的一例。 被縱向添設之金屬箔片4，其縱向添設而捲繞於金屬 箔帶6之外周的寬度方向的捲繞終端部只被重疊貼合預定 -15- 200941510 ’之寬度方向的長度，並利用將此貼合部分彎曲三次以上而 形成折彎部40。 在折彎部40,金屬箔片4之金屬箔層4a分別在三個折 彎部位被塑性變形，藉以強固地維持折彎狀態。因此，在 VW-1試驗時，即使屏蔽扁平電纜If被加熱而從內部之絕 - 緣體3產生氣體，折彎狀態仍不會被打開，氣體不會從折 彎部40洩漏至外部。因此，在絕緣體是聚乙烯等之易燃物 時，仍可在VW-1試驗時防止屏蔽扁平電纜if朝長度方向 0 延燒，可通過VW-1試驗之基準。 其次，說明屏蔽扁平電纜If之製造方法。金屬箔片4 係使其金屬箔層4a作爲內側，樹脂層4b作爲外側進行捲 繞。此時，如第8(a)圖所示，使縱向添設捲繞之捲繞終端 部4 0a彼此貼合（重疊或黏著）。然後，如第8(b)圖所示，在 寬度方向之端部側將被貼合之捲繞終端部40 a彎曲一次， 形成折彎部40b。接著，如第8(c)圖所示，將折彎部40b朝 內側捲入而再次將捲繞終端部40a折彎，形成折彎部40c。 Q 又，如第8(d)圖所示，再次將折彎部40c朝內側捲入，並 ' 且以從絕緣體3之寬度方向突出之方式折彎捲繞終端部 - 40a。藉此，形成將金屬箔片4之捲繞終端部40a彎曲三次 的折彎部40。 藉此，可獲得屏蔽扁平電纜If，其即使在燃燒試驗時 從絕緣體3產生氣體，折彎狀態仍不會被打開，氣體不會 從折彎部40洩漏至外部。又，折彎部40之彎曲次數可爲 三次以上，上限則爲10次左右。另外，從第8(c)圖之狀態 起至最後折彎捲繞終端部40a而成爲第8(d)圖之狀態時， -16- 200941510 •利用將折彎部40黏著於金屬箔片4，可進一步防止彎曲狀 態被打開。 作爲具體之例子，採用第6圖所示之屏蔽扁平電纜 If，且導體2a採用寬度爲0.3mm、厚度爲0.05mm之鍍錫軟 銅線。絕緣體3使用聚乙烯，厚度爲0.16mm。金屬箔帶6 - 係使用銅PET帶（銅之厚度：9/zm; PET之厚度：12/zm)， . 並以聚乙烯系黏著劑黏著於絕緣體3。金屬箔片4係使用 銅PET (銅之厚度：9 v m ; PET之厚度：12// m)，且折彎部 0 40之寬度爲5mm。在將折彎部40之折彎次數設爲3次或5 次時，可通過VW-1試驗之基準。另一方面，在將折彎部 40之折彎次數設爲2次時，則無法通過VW-1試驗之基準。 第9圖爲顯示本發明之其他實施形態的屏蔽扁平電纜 lg之終端部附近的一例之立體圖。 爲了實現低損失，屏蔽扁平電纜lg之絕緣體3，係使 用低介電常數之聚烯烴樹脂，絕緣體厚度則依絕緣樹脂材 料的介電常數與電纜之特性阻抗而決定。作爲絕緣體3， 〇 係雖可從兩面由具有黏著層之樹脂帶挾持並排之導體2而 形成一體，但以藉由擠壓機之擠壓成型來形成爲較佳。在 ' 擠壓成型之情況，由於可使絕緣體3之兩面成爲無凹凸之 平坦面，而在與金屬箔帶6a之黏著面不會產生凹凸，所以 可形成與導體2之間的分布容量爲一定且均勻之阻抗。另 外，絕緣體3係藉由電離放射線之照射而被交聯，由此提 供良好之耐熱性。 如第10(a)圖所示，在屏蔽扁平電纜lg之金屬箔帶6a 形成有內外貫穿之複數個通氣孔11。此等通氣孔11例如係 -17- 200941510 •以直徑爲0.1mm且相隔lmm之間隔形成。又，如第10(b) 圖所示，作爲此等通氣孔11，亦可分別於長度方向交錯地 形成內外貫穿之複數個縫隙。 再者，說明上述之屏蔽扁平電纜lg的製造方法。在製 造上述之屏蔽扁平電纜lg時，首先將複數根導體2a排列 - 成平行一行’並由聚烯烴樹脂所構成之絕緣體3將此等包 . 覆成一體。又，將預先形成有複數個通氣孔11之接地連接 用的金屬箔帶6a，在除了終端外而於長度方向全範圍，黏 @ 著貼附於絕緣體3之外側，藉此由金屬箔帶6來包覆兩面。 然後，從金屬箔帶6a之外側照射電離放射線，對內部 之絕緣體3進行交聯。關於電離放射線，有屬電子線照射 或鈷照射之γ線照射等。藉此，絕緣體3係藉由電離放射 線之照射而被交聯，而被提供良好之耐熱性。 如上述構成，從由藉由電離放射線之照射而進行了交 聯、分解之聚烯烴樹脂所構成的絕緣體3產生氫氣。於是， 此氫氣通過金屬箔帶6a之通氣孔11放出至外部。 〇 藉此，在交聯、分解時所產生之氫氣不會殘留於絕緣 ' 體3與金屬箔帶6a之間而被釋出至金屬箔帶6a的外側。 ' 藉此，可防止金屬箔帶6a從絕緣體3浮起。另外，可消除 因浮起而使得阻抗被部分增高，乃至產生尖峰信號（約7Ω 之尖峰信號）等之阻抗的失真，可達成目標値之阻抗。 根據上述製造方法，係適合於在藉由絕緣體3將導體 2a —體化之絕緣步驟時，進行了貼附金屬箔帶6a之串聯成 型後，對絕緣體3照射電離放射線之情況。 第11圖爲顯示在第9圖所示之屏蔽扁平電纜lg之金 -18- 200941510 •屬箔帶6a的外側具備外被5之屏蔽扁平電纜lh的終端部 附近之立體圖。具備外被5之屏蔽扁平電纜lh，具有如第 12(a)圖所示之套殼外被型及如第12(b)圖所示之PET外被 型。 在具備套殼外被型之外被5的屏蔽扁平電纜lh中，如 • 第12(a)所示，將鋁箔疊層於由聚對苯二甲酸乙二酯（PET) . 構成的樹脂片上之貼鋁PET帶21，被藉由所謂捲煙的捲法 捲繞於周圍，又，擠壓外被22係藉由樹脂之擠壓被覆而形 U 成。作爲擠壓外被22之樹脂，可使用聚烯烴（聚乙烯或聚 丙烯）、PVC、EVA或EEA等之共聚物、聚酯、聚胺基甲酸 酯等。 在具備屬PET外被型之外被5的屏蔽扁平電纜lh中， 如第12(b)所示，將銅箔疊層於由聚對苯二甲酸乙二酯（PET) 構成的樹脂片上之貼銅PET帶23，被藉由所謂捲煙的捲法 捲繞於周圍。在具備此種外被5的上述該屏蔽扁平電纜lh 的情況，在終端部之加工時，亦可藉由C02雷射來切斷除 Q 去外被5。 ' 在製造具備上述外被5的屏蔽扁平電纜lh時，首先， • 將複數根導體2b排列成平行一行，並由聚烯烴樹脂所構成 之絕緣體3將此等包覆成一體。又，將預先形成有複數個 通氣孔11之接地連接用的金屬箔帶6a，在除了終端外而於 長度方向全範圍，黏著貼附於絕緣體3之外側，藉此由金 屬箔帶6a來包覆兩面。 然後，藉由擠壓被覆或捲帶將外被5包覆於金屬箔帶 6a之外周。形成外被5之步驟，可接續於將金屬箔帶6a -19- 200941510 *貼合於絕緣體3之兩面後馬上進行，亦可暫時捲繞使金屬 箔帶6a貼合者後，在另外之步驟來進行。藉由利用擠壓機 之擠壓成型來形成外被5,可比樹脂帶之貼合等加大線速， 而可提高生產性。在爲了將金屬箔帶6a貼合於絕緣體3而 需要減小線速之情況，可暫時捲繞使金屬箔帶6a貼合者， - 然後，以高線速捲出而進行擠壓被覆。 . 然後，從外被5之外側照射電離放射線，對外被5及 內部之絕緣體3進行交聯。藉此，外被5及絕緣體3被提 @ 供良好之耐熱性。此時，從藉由電離放射線之照射而進行 了交聯、分解之聚烯烴樹脂所構成的絕緣體3產生氫氣。 此氫氣通過金屬箔帶6a之通氣孔11而被放出至金屬箔帶 6a的外部。 藉此，交聯、分解時產生之氫氣不會殘留於絕緣體3 與金屬箔帶6a之間。因此，可防止金屬箔帶6a從絕緣體3 浮起，可消除因浮起而使得阻抗部分增高，乃至產生尖峰 信號等之阻抗的失真，可達成目標値之阻抗。 Q 例如，在如第10(a)圖所示之通氣孔11的直徑爲 0.4mm、間隔A爲1.75mm、間隔B爲1.5mm之情況，開口 - 率約爲4.5%，阻抗全體被增高1.5Ω，不會產生尖峰信號。 另外，當將第10(a)圖所示之通氣孔11的直徑設爲1.0mm 時，開口率約爲30%，阻抗全體被增高5Ω，不會產生尖峰 信號。又，在此等例子中，形成通氣孔11而造成阻抗增大 之部分，被用於減薄絕緣體3之厚度以形成預定之阻抗（例 如 100 Ω )。 又，上述各實施形態之屏蔽扁平電纜la〜lh之各構成 -20- 200941510 要素’可適宜地組合。 【圖式簡單說明】 第1(a)、（b)圖爲說明本發明之屏蔽扁平電纜（無外被） 的槪要圖。 第2圖爲說明本發明之屏蔽扁平電纜（有外被）的槪要 - 圖。 - 第3(a)、（b)圖爲本發明之其他屏蔽扁平電纜的示例圖。 第4(a)、（b)圖爲有關本發明之金屬箔片及金靥箔帶的 0 黏著的實施形態之說明圖。 第5圖爲有關本發明之屏蔽扁平電纜的難燃化之說明 圖。 第6圖爲顯示本發明之其他實施形態的屏蔽電纜之終 端部附近的一例之立體圖。 第7圖爲顯示第6圖之屏蔽電纜的截面之剖視圖。 第8(a)〜（d)圖爲顯示形成第6圖之屏蔽電纜的折彎部 之狀況的剖視圖。 〇 第9圖爲顯示本發明之其他實施形態的屏蔽扁平電纜 ' 之終端部附近的一例之立體圖。 - 第10(a)、（b)圖爲顯示金屬箔帶之通氣孔的槪略俯視圖。 第11圖爲顯示在第9圖之屏蔽扁平電纜設置外被時的 終端部附近之立體圖。 第12(a)、（b)圖爲設有外被之屏蔽扁平電纜的剖視圖。 【主要元件符號說明】 la~ lh 屏蔽扁平電纜 •21 - 200941510 *2 a ' 2 b 導體 3 絕緣體 4 金屬箔片（屏蔽導體） 4 a 金屬箔層 4b 樹脂層 - 4 c 黏著劑 . 5 外被 6 金屬箔帶（接地連接用導體） ❹ 7 接地棒 -22-200941510 . [Technical Field] The present invention relates to a shielded flat cable and a method of manufacturing the same, in which a plurality of conductors are arranged in parallel in a row and covered with an insulator, and the outer side is covered with a common shield conductor. . - [Prior Art]. In order to save space and make easy connection to the wiring in the electronic device or the wiring of the machine movable part, it is possible to make the flexible cable flexible. D In addition, the higher the frequency of use of the machine, the greater the influence of noise, so shielded flat cable is used. The shielded flat cable is usually formed by arranging a flat-angle or circular conductor at a predetermined interval in a row, and integrally forming the body by an insulator made of an electrically insulating resin. In addition, the outer side of the insulator is covered with a common conductor to form a shield conductor, and if necessary, it is configured to be protected from the outside of the resin (see, for example, Japanese Patent Laid-Open No. Hei 8-64037 Bulletin 2003-16849). A conventional shielded flat cable uses a drain wire in order to connect the shield conductor 〇 to the ground terminal of the connector or the circuit board at the cable end portion. The ground wire is usually placed inside the shield conductor covering the insulator of the shielded flat cable so as to be in contact with the entire length of the cable. At the end portion of the shielded flat cable, the shield conductor is removed together with the outer cover for connection to the terminal portion of the connector or the circuit board, but the shield conductor is grounded to the shield terminal by the ground line described above. Although the shield conductor and the ground wire are electrically contacted linearly in the axial direction, the contact area is less than or equal to half the surface area of the ground wire. Further, since the contact state is obtained by the coating of the shield conductor or the coating of the outer casing, it has electrical properties. 200941510 • If the contact is insufficient, there is a fear that the grounding reliability of the shield conductor is lowered. Further, since the shield conductor is removed at the cable end portion, there is a possibility that the impedance mismatch may occur in the portion where the shield conductor is removed. In addition, since the shielding function is lowered, there is a problem that the signal transmission is unstable. - [Summary of the invention]. The present invention has been made in view of the above circumstances, and provides a shielded flat cable and a method of manufacturing the same, which can reliably perform a grounding 〇 connection of a shield conductor, prevent impedance mismatch caused by removing a shield conductor, and suppress a shielding effect. reduce. (Means for Solving the Problem) The shielded flat cable of the present invention is provided with at least one surface of a flat cable in which a plurality of conductors are arranged in parallel and covered by an insulator, and a metal foil tape for ground connection is vertically added, and The metal foil strip and the insulation system are covered by a metal foil for shielding. The metal foil tape for the ground connection can be disposed on both sides of the flat cable, and the 〇 can be adhered to the insulator. Further, in the case where the metal foil tape for ground connection is disposed only on one side of the flat cable, the metal foil for shielding can be adhered to the other side of the flat cable. Further, in order to bond the metal foil tape for the insulator to the ground, or the metal foil for the insulator and the shield, it is preferable to apply the adhesive to the mesh steel plate. Further, it is preferable that the insulating system is formed into a flat surface having no unevenness on the surface by extrusion molding. Further, the outer side of the metal foil for shielding is covered with an outer cover, and can be used as a structure for protecting the entire cable. The outer surface is preferably formed by extrusion molding. In this case, the metal foil for shielding is preferably made of a resin layer and a metal foil layer, and is preferably adhered to the outer resin layer and the outer layer. In addition, if the cable does not have an outer cover, the metal foil for shielding is wound on the insulator to 1. It is more than 5 turns and is flame retardant. If the cable is externally sheathed, the outer cover is formed of a mixed resin of a polyurethane resin and an ethylene-vinyl acetate copolymer resin, and is flame retardant. In addition, 0 is added to the insulator. 4% by weight~0. 6 wt% of carbon black is used to facilitate the processing of the metal foil by cable termination by YAG laser. It is also possible to have a configuration in which a bending adjustment member is attached to a bent portion of the cable, the member having a bending radius larger than a minimum bending radius at which the metal foil for shielding is not cut. Further, the winding end portion of the metal foil for shielding may be bent three times or more. Further, the insulator may be a non-flammable resin. Further, the metal foil tape for the ground connection has a plurality of vent holes penetrating inside and outside, and the insulator may be crosslinked. In addition, the outer cross-linking is also acceptable. A method of manufacturing a shielded flat cable according to the present invention, wherein a plurality of conductors 0 are arranged in parallel in a row and integrally formed by an insulator to form a flat cable, and a metal foil for ground connection is longitudinally added to at least one side of the flat cable. * Tape, and the metal foil tape and insulator are covered by a metal foil for shielding. Further, the metal foil may be coated with an outer cover. At the time of crosslinking, the metal foil tape is opened. Further, a metal strip having a plurality of vent holes penetrating inside and outside may be used, and the ionizing radiation may be irradiated from the outside of the metal foil strip to crosslink the insulator. Alternatively, the metal foil may be coated with a plurality of metal strips having a plurality of holes 200941510 through which the inside and the outside are penetrated, or the metal foil may be coated with the metal foil. Further, the outer layer and the insulator may be crosslinked by irradiating the ionizing radiation from the outer side of the outer layer. (Effect of the Invention) According to the present invention, a metal foil tape for ground connection is used for shielding. The metal foil is in contact with the flat surface, so that it has a positive electrical contact and a large contact area. Contact the ground rod to the metal foil for ground connection. · The same is true for the band. Thereby, the grounding q connection of the metal foil for shielding can be surely performed. Further, even in the case where the metal foil for shielding is removed at the cable end portion, since the metal foil tape for ground connection is still at the cable end, impedance mismatch can be prevented, and the reduction of the shielding function can be reduced, and the signal can be ensured. The stability of the transmission and reliability. Further, when the winding end portion of the metal foil sheet is bent three times or more, even if the insulator inside the metal foil sheet is heated at a high temperature to generate a gas, the gas does not leak from the winding end portion to which the metal foil sheet is bonded. external. In addition, even if there is a flame on the outer side of the shielded flat cable, the flame can be blocked by the gold-based foil to prevent the flame from entering the inside. This ensures high ~ flame retardancy. Further, in the case where the insulator is crosslinked by irradiation with ionizing radiation, good heat resistance is imparted. Further, in the case where the metal foil tape is formed with a plurality of vent holes penetrating inside and outside, the hydrogen gas generated when the insulator is irradiated with the ionizing radiation and crosslinked is not released between the insulator and the metal foil tape, and is released. Thereby, the metal foil tape can be prevented from floating from the insulator. In addition, it is possible to eliminate the distortion of the impedance such as a spike signal due to an increase in the impedance portion, and to achieve the impedance of the target 値. 200941510 [Embodiment] An embodiment of the present invention will be described with reference to the drawings. In the figure, la to lh denote shielded flat cables, 2a and 2b denote conductors, 3 denotes an insulator, 4 denotes a metal foil (shield conductor), 4a denotes a metal foil layer, 4b denotes a resin layer, 4c denotes an adhesive, and 5 denotes an outer 6 indicates a metal foil tape (a conductor for ground connection), and 7 indicates a ground bar. A shielded flat cable 1a according to an embodiment of the present invention, as shown in Fig. 1, for example, a conductor 2a having a rectangular cross section is arranged in parallel in a row, and an insulator 3 made of an insulating resin is used to electrically connect the conductors. The insulation is integrally wrapped. A metal foil tape 6 as a grounding connection conductor is longitudinally added to at least one of the flat surfaces of the insulator 3, and the metal foil tape 6 and the metal foil of the shield metal are wound around the outer periphery of the metal foil tape 6 and the insulator 3 4. The metal foil tape 6 for ground connection is formed by covering the width of the conductor 2a which is arranged in a line shape, and is longitudinally added to one side or both sides of the insulator 3. The metal foil 4 for shielding is wound so as to cover the entire insulator 3 and the metal foil tape 6, and is closed at the overlapping portion. The metal foil 4 and the metal foil tape 6 are arranged in surface contact with each other. Since the contact surface is wide, it can be in a good electrical conduction state. The shielded flat cable la is shielded from the external noise by the metal piece 4 as a shield conductor, and is used to shield the radiation toward the external noise. The metal foil 4 for shielding is made to have a thickness of 0. 01 mm~ 0. For the 05 mm, a metal foil composed of a single metal foil of copper or aluminum may be used. Further, as shown in Fig. 1(b), the metal piece 4 is formed by laminating or vapor-depositing a metal foil on a resin sheet, and a metal foil layer 4a (7 m 200941510 '~25" m) and a resin layer 4b can be used. Metal foil composed of (4ym~25//m). Further, as the resin sheet substrate of the metal foil 4, for example, polyethylene terephthalate (PET) can be used. In the case where the laminated body formed of the metal foil layer 4a and the resin layer 4b is used as the metal foil 4, the metal foil layer 4a is inside and the tree-lip layer 4b is wound on the outside, and at least the phase The overlapping part is made up of an adhesive. 4c is fixed by adhesion. Thereby, the metal foil layer 4a of the metal foil 4 can be directly in contact with the metal foil tape 6 for ground connection disposed inside and electrically connected thereto. Further, since the resin layer 4b is outside and the metal foil layer 4a is not exposed, it is possible to maintain a certain range of durability as a cable even if there is no external appearance. In addition, the metal foil tape 6 disposed between the insulator 3 and the metal foil 4 as a grounding connection conductor may be the same as the metal foil 4 for shielding, or may be formed by laminating a metal foil on a resin sheet to enhance strength. . The metal foil tape 6 is attached so as to be in contact with one or both sides of the insulator 3 so that the metal foil layer is outside, and is held by the wrapping of the metal foil 4. The metal foil 4 for shielding Q and the metal foil of the metal foil tape 6 for grounding are in contact with each other in substantially the entire area of the metal foil tape, so that it can be made into a low resistance and a good electrical connection. The insulator 3 is used to electrically insulate the conductors 2a, and is used between the conductors 2a and the metal foil 4 (or the metal foil strip 6) for the purpose of forming an electrostatic coupling for use in a high frequency region. The dielectric properties of the capacitor function. Any one of the loss factor and the relative dielectric constant of the insulator 3 is that the signal transmission loss of the lower one is small, and the high frequency signal can be efficiently transmitted. However, in order to connect to the machine, it is necessary to determine the size by the relative dielectric of the dielectric material 200941510 • constant to achieve the desired impedance. The resin forming the insulator 3 may be polyester or polyvinyl chloride, but a polyolefin resin is preferred. For example, a polyethylene resin or the like may be used. The loss factor of the polyethylene resin is about 4x1 0·4, and the relative dielectric constant is 2. 3 ~ 2. 4, its specific polyester resin (for example, the loss factor of PET is 2xl0·3, phase-to-dielectric constant is 2. 9~3. 0) It is still small, so it is a better material. . When the shielded flat cable 1a configured as described above is connected to the terminal portion of the connector or the circuit board, it is necessary to expose the conductor 2a and the metal foil tape 6 for grounding at the terminal portion. The end portion of the metal foil 4 for shielding is cut by a C〇2 laser, a YAG laser or the like, and this portion is removed to expose the metal foil tape 6 for ground connection. Next, the front end portion of the metal foil tape 6 is removed by a YAG laser to expose the insulator 3 in its entirety. Further, the insulator 3 is cut and removed by the CCh laser so that the inner conductor 2a is exposed (not shown), and is connected to the terminal portion of the connector or the like while maintaining the arrangement pitch of the conductors 2a. The terminal portion formed as described above exposes the metal foil tape 6 for the ground connection at least on one side, and configures the ground bar 7 so as to cross the width direction of the metal foil tape 6 so that the metal foil tape 6 and the ground are provided. Rod 7 is in contact. The ground rod 7' is connected to the ground terminal portion of the connector. Since the metal foil tape 6 for ground connection is in surface contact with the ground bar 7, it can be fixedly held in a connected state, and a reliable and stable electrical connection can be ensured. Further, the metal foil 4 as a shield conductor is removed from the vicinity of the terminal portion in order to be connected to a connector or the like, but the metal foil tape 6 for ground connection is left in contact with the ground. Therefore, the electrostatic capacitance and the external impedance of the insulator 3 between the conductor 2a and the metal foil 4 are uniformly maintained, and no impedance mismatch occurs in this portion. Further, since the shielding function of the metal foil 4 for shielding in the vicinity of the terminal portion is partially removed, the metal foil tape 6 for ground connection can be reduced, and the reliability of noise can be improved. . The shielded flat cable 1b shown in Fig. 2 is covered by the outer cover 5 - the outer side of the metal foil 4 of the shielded flat cable 1a. About by the outside being 5 . The portions other than the configuration of the cladding are substantially the same as those described in the first embodiment, and thus detailed description thereof will be omitted. The outer cover 5 protects the entire cable including the metal foil 4 and has the function of reinforcing the mechanical strength and withstanding bending. The thickness of the outer cover 5 is about 0. 2 mm can be formed of polyvinyl chloride, polyethylene or a mixture of a polyurethane resin described later and an ethylene-vinyl acetate copolymer resin, which is the same as the insulator 3. Further, the outer cover 5 may be integrally bonded to the resin tape having the adhesive layer from both sides so as to cover the shield conductor 4, or may be formed by extrusion molding of an extruder. In the case of using the metal foil sheet 4 for the shield having the outer layer 5 and composed of the metal foil layer and the resin layer, the metal foil sheet 4 is wound with the metal foil layer 4a' as the inner side and the resin layer 4b as the outer side. Wrap around. In the case where the outer cover 5 is formed by extrusion molding of an insulating resin, the portion of the outer resin layer 4b is fused integrally with the outer cover 5 by heat at the time of molding. When the outer layer 5 and the resin layer 4b of the metal foil sheet 4 are fused together, when the outer layer 5 is removed at the time of forming the terminal portion, the metal foil sheet 4 is also removed together, and workability can be improved. Figure 3 is a schematic view of a cross section of another shielded flat cable of the present invention. Fig. 3(a) shows an example in which the metal foil tape 6 is disposed only on one side of the cable, and the conductor 2a of the flat angle is used. Figure 3(b) shows an example of a metal foil strip 6 on both sides of a cable using a circumscribed conductor 2b and -10-200941510. The flat-angle conductor 2a of the shielded flat cable lc of Fig. 3(a) may be, for example, a tinned soft copper foil. The thickness of the conductor is 〇. 〇 3 5~0. 1mm, conductor width is 0. 3mm~0. 8mm, to 〇. 5mm~1. The conductor arrangement pitch of 25 mm is arranged in a row in a row in a row and is integrally covered by an insulator 3. / The circular conductor 2b of the shielded flat cable Id of Fig. 3(b) may be a tinned or single-plated wire which is tinned or silver plated. From the viewpoint of flammability, it is preferable to use the 捻 @ line. The rifling line can adopt the cross-sectional area equivalent to AWG28~AWG40, for example, it can adopt the shape of 捻搓7 (corresponding to AWG34). 06mm wire. The arrangement pitch of the conductors is also based on the signal voltage or the thickness of the circular conductor 2b, but in the case of using the twisted wire, it may be about 0. 3 mm~ 0. The thickness of the 5mm 0 insulator 3 can be determined according to the dielectric constant of the insulating resin material and the characteristic impedance of the cable. Although the insulator 3 may be integrally formed by sandwiching the conductors 2a and 2b in which the resin tape having the adhesive layer is arranged in a row on both sides, it is preferably formed by extrusion molding by an extruder. In the case of extrusion molding, the both faces of the insulator 3 can be formed into a flat surface having no unevenness, so that no unevenness is formed in the laminated portion of the metal foil tape 6 or the metal foil 4, and the conductors 2a, 2b can be formed. The distributed capacity is a certain and uniform impedance. Fig. 4 is an explanatory view showing an embodiment of adhesion of the metal foil 4 and the metal foil tape 6. Fig. 4(a) is an explanatory view showing an example of the supply form of the adhesive of the present invention. Fig. 4(b) is an explanatory view showing an adhesive portion and a non-adhesive portion of the metal foil piece and the metal foil tape. In the figure, 8 indicates an adhesive streak, and 8a and 8b indicate an adhesive streak of a short rod shape -9 indicates an adhesive surface indicating a non-adhesive surface. -11- 200941510 'The metal foil 4 or the metal foil tape 6, as explained in the configuration examples of the first to third figures, is kept at a constant distance from the conductors 2a and 2b, and uniform characteristics can be obtained over the entire length of the cable. The impedance is better. In particular, in the cable without the outer cover 5, it is preferable that the metal foil 4 and the metal foil tape 6 are adhered to the insulator 3 to be integrated. However, it is preferable that the metal foil 4 and the metal foil tape 6 are not adhered to each other to be electrically contacted. Adhesives are supplied to each other. The adhesive surface of either of the adhered metal foil 4 and the insulator 3, and the adhesive surface of either of the metal foil tape 6 and the insulator 3. Further, as the adhesive, for example, a polyester-based adhesive can be used. These adhesions do not need to adhere identically across the entire surface. Therefore, the adhesive can be applied by applying an adhesive to the adhesive surface in various forms such as a zebra, a lattice, a dot, or a textured steel plate. However, depending on the coating shape or the coating state, various problems occur. For example, as shown in Fig. 4(b), the adhesive face 9 and the non-adhesive surface 10 of the metal foil tape 6 and the insulator 3 are formed in a diagonal stripe shape. In this case, for example, when bending is performed along the Ν-Ν line of the non-adhesive surface 10, the metal foil tape 6 is in a state of floating on the non-adhesive surface 10, and the impedance of the cable is changed. Also, in this state, when the bending is repeated, 'there will be creases, and the metal foil may be broken. Therefore, it is preferable to apply the adhesive in which the adhesive streak is always present in any direction. In view of this, it has been found that a pattern of a textured steel sheet (also referred to as a textured steel sheet) which is well-known as a steel sheet for sliding prevention as shown in Fig. 4(a) is preferable. The adhesive stripe 8 of the textured steel sheet is alternately arranged with the orthogonal short rod-shaped adhesive strips 8a, 8b so as to be inclined in the longitudinal direction or the width direction. For example, the width of one of the adhesive stripes 8a, 8b is set to be about 0. 5mm, the length is set to about 4. 5mm, coated at any density -12- 200941510 • affixed to the adhesive side of the insulator 3 or the adhesive side of the metal foil strip 6 or the metal foil 4 side. According to the adhesive streaks of the textured steel sheet, no linear non-adhesive surface 10 is produced, and the metal foil strip 6 or the metal foil 4 does not float in a rib shape. In addition, in recent years, there has been a high demand for cables having flame retardancy. Fig. 5 is a view showing a configuration example for improving the flame retardancy of the cable of the present invention. Figure. In the cable without the outer cover shown in Fig. 1, in the overlapping portion of the winding of the metal foil 4, the narrow state of the wound state is maintained by adhesion. However, if the amount of winding overlap of the metal foil 4 is small, the adhesive 4c of the overlapping portion is melted by the combustion. Thus, the insulator on the inner side is vaporized and discharged from the overlapping portion, and the combustion of the vaporized portion contributes to the elongation of the cable. Therefore, it is preferable to shield the flat cable le as shown in Fig. 5 to increase the wound overlapping portion of the metal foil 4. The result of the test, when winding 1. When the metal foil 4 of 5 turns is brought into contact with the flame from the winding side of the metal foil 4, leakage of the combustion gas can be suppressed. Therefore, the metal foil 4 is wound around the outer periphery of the insulator 3 to reach 1. More than 5 turns, and set the overlap of the winding to 0. 5 以上 The winding amount is preferably above. Further, in the case where the metal foil of the metal foil 4 is an aluminum foil *, the thickness of 7 w m is opened, so that the flame retardancy test becomes unacceptable, and a thickness of 10 / / m is required. In the case of copper foil, the thickness of the 7/zm' flame retardancy test became acceptable. Therefore, in order to thin the metal foil 4 and improve flame retardancy, it is preferable to use a copper foil. Further, in the cable having the 5 other than the second figure, the flame retardancy can be improved by using the flame retardant as the outer material. As a flame retardant, it is conventional to use a flame-retardant polyethylene or a polyvinyl chloride resin to which a halogen-based flame retardant is added, but from the environmental point of view, it is a halogen-free flame retardant that does not contain halogen-13-200941510 "The demand for a cable is increased. In the present invention, as a cable 5, a mixed resin of a polyurethane resin and an ethylene-vinyl acetate copolymer (EVA) resin is used (for example, refer to JP-A-2008). -117609), in order to achieve the flame retardation of the cable. The polyurethane resin and the EVA resin are in a weight ratio of 40: 60 - 90: 10, and the VA content of the EVA is 50 to 90% by weight. Preferably, it is preferable to use a metal hydroxide such as magnesium hydride or aluminum hydride having a weight of 40 to 250 parts by weight with respect to 100 parts by weight of the mixed resin. In the case of covering the metal foil 4, when the metal foil 4 can partially overlap the terminal for forming a connector or the like, the metal foil of the metal foil 4 for shielding is preferably cut by using a YAG laser. Further, for the cutting of the insulator 3, a C〇2 laser can be usually used. When the insulator 3 is transparent or natural, when the metal foil is cut by the YAG laser, the conductor inside the insulator 3 may be deteriorated. On the other hand, when the insulator 3 is colored and it is difficult to transmit the yag laser, It will be difficult to cut the insulator 3 by the 〇匚〇2 laser. In the present invention, it is preferable to add carbon black to the insulator 3 so that the color of the insulator 3' is light black. The amount of carbon black added is about 〇-5wt% (〇. 4% by weight ~ 〇. 6 wt%) is preferred. If the amount of carbon black added is such a degree, the YAG laser does not easily affect the inner conductor 2a. Only the metal foil 4 can be cut. In addition, the insulator 3 can be surely cut by a C 〇 2 laser. In addition, in the flat cable having the metal foil 4 for shielding, regardless of the presence or absence of the outer cover 5, when it is extremely bent (bending below the minimum bending radius) -14-200941510', there will be a metal foil 4 The metal foil layer 4a is cracked or cut. Therefore, it is desirable to have a bending adjustment means at a portion to be bent in such a manner that the cable is not bent at a radius below a predetermined bending radius, so that the bending radius of the cable is not cut off from the metal foil 4 The minimum bend radius is also large. • In the present invention, the cable does not bend below a predetermined labyrinth. In the shape, the bending adjustment member is placed in a position to be bent in a desired manner. The bending adjustment member may be formed of a cylindrical member, a cylindrical, a semi-cylindrical, and a semi-cylindrical rod-shaped member. Further, the radius of the curved surface of the bending adjustment member, for example, the bending radius of about 90 degrees with respect to the cable, may be about 1. 5mm, and the bending radius can be about 2. Compared with the 180 degree bending of the cable. 5mm. The shielded flat cable having the above-described configuration has a shield function capable of suppressing electromagnetic radiation to the outside and suppressing electromagnetic radiation from an external device, and can be applied to wiring of an electronic device using high-frequency signals or wiring of a movable portion. Alternatively, all of the conductors may be used as a signal line, or a part may be used as a wire. In addition, it can also be used as a cable for differential transmission, and the cable for differential transmission of Q is used to transmit a signal of a digital data at a high speed, and to transmit a data signal in a reverse phase using a pair of signal lines. cable. In the case of a cable for differential transmission, a pair of adjacent conductors can be used as a signal line, and conductors on both sides can be used as a ground conductor, and can be used in a form in which crosstalk with adjacent signal lines is prevented. Figs. 6 and 7 show an example of the vicinity of the end portion of the shielded cable 1 f according to another embodiment of the present invention. The metal foil piece 4 which is longitudinally added is longitudinally added, and the winding end portion wound in the width direction of the outer circumference of the metal foil tape 6 is overlapped and laminated only in the width direction of the predetermined -15-200941510', and The bent portion 40 is formed by bending the bonded portion three times or more. In the bent portion 40, the metal foil layers 4a of the metal foil 4 are plastically deformed at the three bent portions, whereby the bent state is strongly maintained. Therefore, in the VW-1 test, even if the shielded flat cable If is heated to generate gas from the inner permanent-edge body 3, the bent state is not opened, and the gas does not leak from the bent portion 40 to the outside. Therefore, when the insulator is a flammable substance such as polyethylene, the shielded flat cable can be prevented from being burned in the longitudinal direction at the VW-1 test, and can pass the VW-1 test. Next, a method of manufacturing the shielded flat cable If will be described. The metal foil 4 has the metal foil layer 4a as the inner side and the resin layer 4b as the outer side. At this time, as shown in Fig. 8(a), the winding end portions 40a which are wound in the longitudinal direction are bonded to each other (overlapped or adhered). Then, as shown in Fig. 8(b), the wound end portion 40a to be bonded is bent once at the end portion side in the width direction to form the bent portion 40b. Then, as shown in Fig. 8(c), the bent portion 40b is wound inward and the winding end portion 40a is again bent to form the bent portion 40c. Further, as shown in Fig. 8(d), the bent portion 40c is again wound inward, and the winding end portion - 40a is bent so as to protrude from the width direction of the insulator 3. Thereby, the bent portion 40 that bends the winding end portion 40a of the metal foil piece 3 three times is formed. Thereby, the shielded flat cable If can be obtained, even if gas is generated from the insulator 3 at the time of the combustion test, the bent state is not opened, and the gas does not leak from the bent portion 40 to the outside. Further, the number of times of bending of the bent portion 40 may be three or more, and the upper limit may be about ten times. Further, when the state is in the state of the eighth (d) from the state of the eighth (c) to the final bending of the winding end portion 40a, -16-200941510 • the bent portion 40 is adhered to the metal foil 4 It can further prevent the bending state from being opened. As a specific example, the shielded flat cable If shown in Fig. 6 is used, and the conductor 2a has a width of 0. 3mm, thickness is 0. 05mm tinned soft copper wire. The insulator 3 is made of polyethylene and has a thickness of 0. 16mm. Metal foil tape 6 - is a copper PET tape (thickness of copper: 9 / zm; thickness of PET: 12 / zm), . It is adhered to the insulator 3 with a polyethylene adhesive. The metal foil 4 was made of copper PET (thickness of copper: 9 v m; thickness of PET: 12/m), and the width of the bent portion 0 40 was 5 mm. When the number of times of bending of the bent portion 40 is set to 3 or 5 times, the standard of the VW-1 test can be passed. On the other hand, when the number of times of bending of the bent portion 40 is two, the standard of the VW-1 test cannot be passed. Fig. 9 is a perspective view showing an example of the vicinity of the end portion of the shielded flat cable lg according to another embodiment of the present invention. In order to achieve low loss, the insulator 3 of the flat cable lg is shielded by using a low dielectric constant polyolefin resin, and the thickness of the insulator is determined by the dielectric constant of the insulating resin material and the characteristic impedance of the cable. As the insulator 3, the lanthanum may be integrally formed by sandwiching the conductors 2 which are arranged side by side from a resin tape having an adhesive layer, but it is preferably formed by extrusion molding by an extruder. In the case of 'extrusion molding, since both surfaces of the insulator 3 can be made into a flat surface having no unevenness, the unevenness of the adhesion to the metal foil tape 6a does not occur, so that the distribution capacity with the conductor 2 can be made constant. And uniform impedance. Further, the insulator 3 is crosslinked by irradiation with ionizing radiation, thereby providing good heat resistance. As shown in Fig. 10(a), the metal foil tape 6a of the shielded flat cable lg is formed with a plurality of vent holes 11 penetrating inside and outside. These vents 11 are, for example, -17-200941510 • with a diameter of 0. 1 mm and formed at intervals of 1 mm. Further, as shown in Fig. 10(b), as the vent holes 11, a plurality of slits penetrating inside and outside may be alternately formed in the longitudinal direction. Furthermore, a method of manufacturing the above-described shielded flat cable lg will be described. In the manufacture of the above-mentioned shielded flat cable lg, the plurality of conductors 2a are first arranged in a parallel row and the insulator 3 composed of a polyolefin resin is packaged. Overlaid. Further, the metal foil tape 6a for ground connection in which a plurality of vent holes 11 are formed in advance is attached to the outer side of the insulator 3 in the entire length direction except for the terminal, whereby the metal foil tape 6 is used. To cover both sides. Then, ionizing radiation is irradiated from the outside of the metal foil tape 6a, and the internal insulator 3 is crosslinked. Regarding the ionizing radiation, there is a gamma ray irradiation such as electron beam irradiation or cobalt irradiation. Thereby, the insulator 3 is crosslinked by irradiation of ionizing radiation, and is provided with good heat resistance. According to the above configuration, hydrogen gas is generated from the insulator 3 composed of a polyolefin resin which is crosslinked and decomposed by irradiation with ionizing radiation. Then, this hydrogen gas is discharged to the outside through the vent holes 11 of the metal foil tape 6a.借此 In this way, hydrogen generated during crosslinking and decomposition does not remain between the insulating body 3 and the metal foil tape 6a and is released to the outside of the metal foil tape 6a. Thereby, the metal foil tape 6a can be prevented from floating from the insulator 3. In addition, it is possible to eliminate the distortion of the impedance due to the floating portion, and even the impedance of the spike signal (a spike signal of about 7 Ω), and the impedance of the target 可 can be achieved. According to the above-described manufacturing method, in the case of the insulating step of forming the conductor 2a by the insulator 3, the insulator 3 is irradiated with ionizing radiation after the metal foil tape 6a is attached in series. Fig. 11 is a perspective view showing the vicinity of the terminal portion of the shielded flat cable 1h having the outer cover 5 on the outer side of the foil tape 6a, as shown in Fig. 9. The shielded flat cable lh having the outer cover 5 has a jacket outer cover type as shown in Fig. 12(a) and a PET outer cover type as shown in Fig. 12(b). In the shielded flat cable lh having 5 outer casing type, as shown in Fig. 12(a), the aluminum foil is laminated on polyethylene terephthalate (PET). The aluminum PET tape 21 attached to the resin sheet is wound around by a so-called cigarette roll method, and the outer cover 22 is formed by extrusion of a resin. As the resin for extruding the outer cover 22, a copolymer of polyolefin (polyethylene or polypropylene), PVC, EVA or EEA, a polyester, a polyurethane or the like can be used. In the shielded flat cable 1h having a PET outer cover type 5, as shown in the 12th (b), the copper foil is laminated on a resin sheet composed of polyethylene terephthalate (PET). The copper-clad PET tape 23 is wound around by a so-called cigarette roll method. In the case where the shielded flat cable 1h of the above-described outer cover 5 is provided, the Q-out laser can be used to cut the Q-outer 5 by the C02 laser. When the shielded flat cable lh having the above-described outer cover 5 is manufactured, first, the plurality of conductors 2b are arranged in a line in parallel, and the insulator 3 made of a polyolefin resin is integrally wrapped. Further, the metal foil tape 6a for ground connection in which a plurality of vent holes 11 are formed in advance is attached to the outer side of the insulator 3 in the entire length direction except for the terminal, thereby being wrapped by the metal foil tape 6a. Cover both sides. Then, the outer cover 5 is wrapped around the outer periphery of the metal foil tape 6a by extrusion coating or tape. The step of forming the outer cover 5 may be performed immediately after bonding the metal foil tape 6a -19- 200941510* to both sides of the insulator 3, or may be temporarily wound to bond the metal foil tape 6a, and in another step. Come on. By forming the outer cover 5 by extrusion molding using an extruder, the wire speed can be increased by the bonding of the resin tape or the like, and the productivity can be improved. In order to bond the metal foil tape 6a to the insulator 3, it is necessary to reduce the wire speed, and the metal foil tape 6a may be temporarily wound to be bonded to the metal foil tape 6a, and then rolled up at a high wire speed to perform extrusion coating. . Then, the ionizing radiation is irradiated from the outside of the outer casing 5, and the outer insulator 5 and the inner insulator 3 are crosslinked. Thereby, the outer cover 5 and the insulator 3 are provided with good heat resistance. At this time, hydrogen gas is generated from the insulator 3 composed of a polyolefin resin which is crosslinked and decomposed by irradiation with ionizing radiation. This hydrogen gas is discharged to the outside of the metal foil tape 6a through the vent holes 11 of the metal foil tape 6a. Thereby, hydrogen generated during crosslinking and decomposition does not remain between the insulator 3 and the metal foil tape 6a. Therefore, it is possible to prevent the metal foil tape 6a from floating from the insulator 3, and it is possible to eliminate the distortion of the impedance portion due to the floating portion, and even the impedance of the spike signal or the like, thereby achieving the target 値 impedance. Q For example, the diameter of the vent hole 11 as shown in Fig. 10(a) is 0. 4mm, interval A is 1. 75mm, interval B is 1. In the case of 5mm, the opening - rate is about 4. 5%, the impedance is increased by 1. 5Ω, no spikes are generated. Further, when the diameter of the vent hole 11 shown in Fig. 10(a) is set to 1. At 0 mm, the aperture ratio is about 30%, and the impedance is increased by 5 Ω in total, and no spike signal is generated. Further, in these examples, the portion where the vent hole 11 is formed to cause an increase in impedance is used to thin the thickness of the insulator 3 to form a predetermined impedance (e.g., 100 Ω). Further, each of the components -20-200941510 of the shielded flat cables 1a to 1h of the above embodiments can be combined as appropriate. BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1(a) and (b) are schematic views for explaining a shielded flat cable (without an outer cover) according to the present invention. Fig. 2 is a view showing the outline of the shielded flat cable (with the outer cover) of the present invention. - Figures 3(a) and (b) are diagrams showing other examples of shielded flat cables of the present invention. Figs. 4(a) and 4(b) are explanatory views showing an embodiment of the adhesion of the metal foil piece and the metal enamel foil tape of the present invention. Fig. 5 is an explanatory view showing the flame retardancy of the shielded flat cable of the present invention. Fig. 6 is a perspective view showing an example of the vicinity of the end portion of the shielded cable according to another embodiment of the present invention. Fig. 7 is a cross-sectional view showing a section of the shielded cable of Fig. 6. Figs. 8(a) to 8(d) are cross-sectional views showing the state in which the bent portion of the shielded cable of Fig. 6 is formed. Fig. 9 is a perspective view showing an example of the vicinity of a terminal portion of a shielded flat cable ' according to another embodiment of the present invention. - Figures 10(a) and (b) are schematic plan views showing the vent holes of the metal foil tape. Fig. 11 is a perspective view showing the vicinity of the terminal portion when the shielded flat cable of Fig. 9 is provided with an outer cover. Figure 12(a) and (b) are cross-sectional views of a shielded flat cable with a cover. [Main component symbol description] la~ lh Shielded flat cable • 21 - 200941510 *2 a ' 2 b Conductor 3 Insulator 4 Metal foil (shield conductor) 4 a Metal foil layer 4b Resin layer - 4 c Adhesive . 5 outer cover 6 metal foil tape (conductor for ground connection) ❹ 7 ground rod -22-