200837778 • 九、發明說明： 【發明所屬之技術領域】 發明領域 本無明係有關於一種同軸電纟覽。 5 【先前技術】 . 發明背景 • 習知在同軸電纜中有以提高屏蔽效果，謀求衰減量之 Φ 減低為目的，而將外部導體相對於此同軸電纜之長軸方向 以一定角度捲繞於介電體層者。本案申請人提出外部導體 10係使用於絕緣帶蒸鍍鋁或銅等金屬或貼合該等金屬箔之金 屬帶之同軸電纜（參照曰本專利公開公報2000-057863號)及 ~ 外部導體係使用複數條件導電性線之同軸電纜（參照曰本 專利公開公報2003-092031號）。 專利公開公報2000-057863號之同軸電纜係從介電層 15上捲繞作為外部導體之金屬帶，將此金屬帶相對於同軸電 φ 纜之長軸方向以〇度〜25度之角度捲繞。然後，藉以預定範 圍内之角度捲繞金屬帶，日本專利公開公報2000-057863號 之同軸電鐵可獲得足夠之屏蔽效果，進而可謀求衰減量之 ^ 減低。 2〇 日本專利公開公報2003-092031號之同軸電纜係從介 電體上將作為外部導體之複數條導電性線捲繞成螺旋狀， 將此複數條導電性線相對於同轴電纜之長軸方向以8度〜19 度之角度捲繞。然後，藉以預定範圍内之角度捲繞複數條 導電性線，日本專利公開公報2003-092031號之同軸電纜可 5 200837778 提供屏蔽效果等電特性優異之同軸電纜。 在上述同軸電纜中，藉將作為外部導體之金屬帶或複 數條導電性線以預定角度捲繞於介電體層，可獲得足夠之 屏蔽特性，謀求衰減量之減低。 5 對此，機器之高性能化進步之電子機器業界等強烈希 望得以使用具有可撓性，具高屏蔽特性，而可謀求衰減量 減低，衰減量變動小之同軸電纟覽。 L發明内容1 發明揭示 10 本發明即是鑑於上述各種課題而發明者，其目的在於 提供一種具可撓性，且具高屏蔽特性，減低衰減性，同時， 變動小之同軸電纜。 為達成上述目的，本發明之同軸電纜包含有内部導 體、設置於該内部導體外周之介體電層、設置於該介電體 15 層外周之外部導體層及設置於該外部導體層外周之保護坡 覆層；並於前述外部導體層與前述保護彼覆層間設置由捲 繞前述外部導體層之捲繞帶構成之捲繞帶層，前述捲繞帶 層係相對於前述同軸電纜之長軸方向以預定角度捲繞。 藉此，本發明之同軸電纜從同軸電纜之外部導體層上 20 捲繞捲繞帶。因此，由於可以捲繞帶按壓外部導體層，故 可捆緊外部導體層，提高外部導體層之密合度，而提高屏 蔽特性。由於可捆緊外部導體，故將同軸電纜彎曲時，外 部導體層不易形成間隙，而可將提高屏蔽特性之狀態維持 穩定。 200837778 又，在本發明之同軸電纜中，前述捲繞帶宜為金屬化 帶。藉此，由於捲繞帶層為屏蔽層，故具有外部導體層及 捲繞帶層2個屏蔽，而可更提高屏蔽特性。又，在此同軸電 纜中，可使捲繞帶層與外部導體層密合，而將提高屏蔽特 5 性之狀態維持穩定。 在本發明之同軸電纜中，前述預定角度宜在25度〜50 度之範圍内。藉此，本發明之同軸電纜可維持生產效率， 並且以捲繞帶層將外部導體捆緊，提高屏蔽特性。 在本發明之同軸電纜中，前述外部導體層橫捲繞1層。 10 又，在本發明之同軸電纜中，前述外部導體層橫向捲繞2 層。不論外部導體層捲繞1層或2層，皆可從其上方捲繞捲 繞帶，捆緊外部導體層，故即使外部導體層之捲繞數增加， 亦可適用本發明。 圖式簡單說明 15 第l(a)〜(c)圖係顯示本發明實施形態之同軸電纜1者。 第2圖係顯示同軸電纜1之屏蔽實驗結果之第1圖。 第3圖係顯示同軸電纜1之屏蔽實驗結果之第2圖。 第4圖係顯示同軸電纜1之捲繞實驗之實驗方法者。 第5圖係顯示同軸電纜1之捲繞實驗結果之第1圖。 20 第6圖係顯示同軸電纜1之捲繞實驗結果之第2圖。 第7圖係顯示同軸電纜1之捲繞實驗結果之第3圖。 第8圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 捲繞實驗結果之第1圖。 第9圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 7 200837778 . 捲繞實驗結果之第2圖。 第10圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 捲繞實驗結果之第3圖。 【實施方式3 5 實施發明之最佳形態 • 以下，參照圖式，說明本發明第1實施形態。此外，以 下說明之實施形態非限定申請專利範圍之發明者，在實施 形態中說明之特徵之所有組合不限於本發明成立所必要 • 者。 10 首先，使用第1圖，就本實施形態之同軸電纜1之結構 作說明。在此，在第1圖中，第1(a)圖係本實施形態之同軸 • 電纜1之立體圖，第1(b)圖係本實施形態之同軸電纜1之截面 圖，第1(c)圖係顯示捲繞同軸電纜1之捲繞帶之步驟者。 如第1圖所示，本實施形態之同軸電纜1大致以中心導 15 體（内部導體）11、介電體層12、外部導體層13、本發明特徵 0 部份之捲繞帶層14、護套15(保護彼覆層）構成。此同軸電參覽 1以以下之程序形成。 即，此同軸電纜11將複數條導體11a捻合，形成中心導 體11，於此中心導體11之外周使用擠壓機（圖中未示），擠壓 20介電體12a而形成介電體層12。然後，於此介電體層12之外 • 周橫向捲繞複數條導體線13a，形成外部導體層13 ’在此外 部導體層13之外周，於與導體13a之橫向捲繞方向相反之方 向將金屬化帶之ALPET14a(捲繞帶)捲繞成螺旋狀，形成本 發明之特徵部份之捲繞帶層I4。然後’於此捲繞帶層14之 8 200837778 -外周擠壓包覆護套15而形成。如此進行，形成同軸電纜1。 舉例說明此同軸電纜1之材質，導線11a之材質為鍍銀 軟銅線，介電體12a之材質為四氟乙烯-六氟丙烯共聚物（以 下僅稱為FEP)，導體線13a之材質為鍍錫軟銅線，護套15之 5 材質為FEP。 - 此外，本實施形態之同軸電纜1之材質不限於上述材 質，通常亦可使用用於同軸電纜之其他材質者。舉例言之， ^ 介電體亦可使用聚四氟乙烯(PTFE)或四氟乙烯一全氟乙烯 基醚共聚物(PFA)等其他氣樹脂。在本實施形態之同軸電縵 10 1中，捲繞捲繞帶層14之方向只要可捆緊作為外部導體層13 • 而橫向捲繞之導體線13a，為與導體13a之橫向捲繞方向相 • 同之方向亦可。 又，ALPET14a藉由聚氯乙烯（以下僅稱為Pvc)，層疊 鋁箔及聚乙烯對苯二曱酸酯（以下僅稱為PET)，而形成帶 15狀。然後，此ALPET14a以鋁箔與外部導體層13接觸之狀態 φ 從外部導體層13上捲繞。 在上述本實施形態之同軸電纜1中，如第1(c)圖所示， 外部導體層13係將導體線13a橫向捲繞，從此外部導體層13 、 上將用以形成捲繞帶層14之ALPET14a相對於同轴電纟覽 • 20 長軸方向以預定角度0捲繞成螺旋狀。因此，外部導體層13 藉此捲繞帶層14施加所期之應力而捆緊，而提高外導體層 13之導體線13a間之密合度。進而，由於複數條導體線 藉捲繞帶層14捆緊，故藉此捲繞帶層14，可維持導體線 密合之狀態，即使同軸電纜1彎曲，仍可抑制各導體線13a 9 200837778 在該彎曲部份分離。由於此捲繞帶層14RALpET14a形成， 故此捲繞帶層14亦可發揮屏蔽之作用。 藉此，本實施形態之同軸電纜〗包含外部導體層13及捲 繞帶層14具屏敵效果之2個層，再者，由於外部導體層13之 5導體線13a藉捲繞帶層14捆緊，故可提高導體線i3a間之密 合度，維持其密合狀態，而可更提高外部導體層13之屏蔽 效果。 接著，進行了就捲繞本實施形態同軸電纜丨之捲繞帶層 14之預定角度Θ界定其範圍之實驗，使用第2圖〜第1〇圖，就 10 此實驗作說明。 此外，在此次之實驗中，進行了求出上述預定角度0與 屏蔽效果之特性之關係，以界定預定角度$之範圍之屏蔽實 驗及求出上述預定角度^與衰減量之關係，以界定預定角度 0之範圍之捲繞實驗2個實驗。於第2圖、第3圖顯示屏蔽實 15驗之實驗結果，於第4圖顯示捲繞實驗之實驗法，於第5圖〜 第10圖顯示捲繞實驗之實驗結果。首先，使用第2圖、第3 圖’就屏敝實驗詳細說明。 第2圖係顯示屏蔽實驗之實驗結果之表，第3圖係顯示 屏蔽實驗之實驗結果者。在此屏蔽實驗中進行所謂之吸收 20 夾具法(abs〇rbing clamp)，此吸收夾具法將使捲繞捲繞帶層 14之預定角度0不同之4條同軸電纜1調整為長度3m，作為實 驗用電·Α〜D ’使用RF(Radi〇 Frequency)網路分析儀，檢 測插入此實驗用電纜A〜D之信號漏至實驗用電纜A〜D外部 之量。另，插入之信號從0Hz至1GHz依序變化，測量此期 200837778 間之屏蔽效果之變化。此外，對習知所使用之編織型同車由 電纜亦同樣地進行了實驗，以用於比較。 在此屏蔽實驗使用之4個實驗用電纜A〜D之結構係網^ 條外徑0.102mm之鐘銀軟銅線检合，形成中心導體11，认 聆此 中心導體之外周包覆FEP，以將介電體層12形成外後為 0.9mm，於此介電體層外周將29條相當於導體線13a之外和< 〇· 102mm之鍍錫軟銅線相對於同軸電纜之長軸方向以9 6声 之角度’橫向捲繞而形成外部導體層，於此外部導體芦13 之外周將藉由厚度2〜3/rni之PVC層疊厚度1 Ομιη之鋁箱及厚 10 度12μηι之PET而形成之ALPET14A捲繞成螺旋狀，而形成 捲繞帶層14 ’於此捲繞帶層14之外周擠壓包覆由厚度 0.12mm之FEP構成之護套15而形成，此實驗用電纜a〜d之 外徑為1.37mm。 習知之編編型同軸電纜之結構係將7條外徑〇.i〇2mm 15 之鍍銀軟銅線捻合，形成中心導體，於此中心導體之外周 _ 包覆FEP，以將介電體層形成外徑為〇.8gmm，於此介電體 層外周使用外徑〇.〇5mm之鍍錫軟銅線，以束數16、條數6 之編織構造形成外部導體層，於此外部導體層之外周擠壓 ‘ 包覆由厚度〇.12mm2FEP構成之護層而形成，此習知編織 、 20 型同軸電缓之外徑為1.37mm。 實驗用電纜A〜D分別變更用以捲繞捲繞帶層14之角度 沒，實驗用電纟覽A將捲繞帶層14相對於同軸電纟覽丨之長轴方向 以20度之角度捲繞成螺旋狀，實驗用電親b將捲繞帶層14 相對於同軸電纜1之長軸方向以25度之角度捲繞成螺旋 11 200837778 ★狀，實驗用電纜c將捲繞帶層14相對於同軸電纜1之長軸方 向以30度之角度捲繞成螺旋狀，實驗用電纜D將捲繞帶層 相對於同軸電纔1之長軸方向以40度之角度捲繞成職狀。 從第2圖、第3圖可知，具有本實施形態之同轴電則 5之特微結構之實驗用電纜A〜D全體之屏蔽效果較編織型同 - 軸電纜咼。又，比較實驗用電纜A〜D，實驗用電纜a於信號 • 為10MHz時，屏蔽效果為-51.7dB，於信號為100MHz時， φ 屏蔽效果為_48.5dB，實驗用電纜B於信號為10MHz時，屏 蔽效果為-52_5dB ’於信號為ioomhz時，屏蔽效果為 10 -49.8dB，實驗用電纜C於信號為l0MHz時，屏蔽效果為 -53.4dB ’於信號為100MHz時，屏蔽效果為-5〇.〇dB，實驗 用電纜D於信號為10MHz時，屏蔽效果為_55·1(1Β，於信號 為100MHz時，屏蔽效果為-51.1dB。 因而，可知本實施形態之同軸電纜丨具有較習知同軸電 15鏡咼之屏蔽效果，用以捲繞捲繞帶層14之角度0較大者可獲 φ 得較高之屏蔽效果。即，從屏蔽實驗之效果，用以捲繞捲 繞帶層14之角度^以20度以上為佳。惟，當捲繞之角度0增 大時’捲繞帶層14之ALPET14a之寬度與角度峨反比例而 變窄’故同軸電纜1之生產性降低。因此，用以捲繞捲繞帶 20層14之角度^當考慮生產性時，以50度為上限。因而，在屏 蔽實驗中，用以捲繞捲繞帶層14之角度0為2〇度以上、50度 以下可謂較佳角度。接著，使用第4圖〜第10圖，就捲繞實 驗译細說明。 第4圖係用以說明捲繞實驗之實驗法者。首先，使用第 12 200837778 4圖，就捲繞實驗之實驗方法作說明。捲繞實驗係將實驗用 電纜在外徑l〇mm之管20間隔10mm捲繞12次，於此捲繞之 實驗用電纜•插入5GHz及6GHz之2種信號，測量信號之衰減 量。 5 在此捲繞實驗中，進行了使用與在第2圖、第3圖說明 之屏蔽實驗相同之實驗用電纜A〜D及使用了與屏蔽實驗不 同之實驗用電纜F〜Η之實驗之2種捲繞試驗。首先，使用第 5圖〜第7圖，就使用了與屏蔽實驗相同之實驗用電纜a〜d之 實驗之結果作說明。 10 第5圖係顯示捲繞實驗之實驗結果之表，第6圖係顯示 捲繞實驗之衰減量與捲繞帶層14之捲繞角度0之關係者，第 7圖係顯示捲繞實驗之衰減量之變動值與捲繞帶層14之捲 繞角度^之關係者。另，在此捲繞實驗中，亦對習知所使用 之編織型同軸電纜同樣地進行了實驗，以用於比較。 15 從第5圖可知，編織式同軸電纜之衰減量於5GHz時， 為3.67dB/m，於6GHz時，為4.03dB/m，相對於此，在具有 本實施形態同軸電纜1之特徵結構之實驗用電緵A〜D中，實 驗用電纟覽A之衰減量於5GHz時，為3.36dB/m，於6GHz時， 為3.692dB/m，實驗用電纜B之衰減量於5GHz時，為 20 3.305dB/m，於6GHz時，為3.626dB/m，實驗用電纜C之衰 減量於5GHz時，為3.233dB/m，於6GHz時，為3.554dB/m， 實驗用電纜D之衰減量於5GHz時，為3.192dB/m，於6GHz 時，為3.510dB/m。因而，可知具有本實施形態同軸電纜1 之特徵結構之實驗用電纜A〜D全體衰減量較編織型同軸電 13 200837778 -纜減低。 又’從第5圖〜第7圖可知，在實驗用電纜a〜D中，將捲 繞帶層14相對於同軸電纜之長轴方向以40度捲繞成螺旋狀 之實驗用電纜〇之衰減量及衰減量變動值最小，在實驗用電 5纜A及實驗用電纜D，衰減量產生約〇.2dB/m之差。因而， ^ 可知本實施形態之同軸電纜1之衰減量較習知同軸電纜減 低’當捲繞捲繞帶層14之角度^增大時，衰減量可更減低。 ^ 又’實驗用電纜C之衰減量與實驗用電纜D之衰減量之 差約0.04dB/m，其差小，衰減量變動於6GHz時幾乎無差。 10從此情形可知衰減量之減低於捲繞捲繞帶之角度0超過30 度時，衰減量之變化幾乎呈平穩狀態，故以此3〇度為分界， 而在某程度到達最高值。因此，即使捲繞捲繞帶層14之角 度0在40度以上，衰減量之值不致大幅變化，可維持良好之 狀態。如屏蔽實驗之結果所敘述，當考慮生產性時，捲繞 15 捲繞帶層14之角度0以50度為上限。 φ 在本實施形態之同軸電纜1中，從第5圖〜第7圖可知， 衰減量較習知大幅提高，變動量縮小之捲繞帶層14之捲繞 角度約25度。 以上，從此衰減量實驗之結果，捲繞捲繞帶層14之角 20度0之下限為25度，50度為上限。當將衰減量及生產性列入 考慮時，衰減量之變化幾乎呈平穩之30度以上、40度以下 可謂捲繞捲繞帶層14最佳之角度。接著，使用第8圖〜第1〇 圖，就使用其他實驗用電纜之捲繞實驗作詳細說明。 第8圖係顯示使用其他實驗用電纜F〜Η之捲繞實驗之 14 200837778 * 實驗結果之表，第9圖係顯示使用其他實驗用電纜F〜H之捲 繞實驗之衰減量與捲繞帶層14之捲繞角度$之關係者，第10 圖係顯示使用其他實驗用電纜F〜Η之捲繞實驗之衰減量之 變動值與捲繞帶層14之捲繞角度Θ之關係者。 5 在此捲繞實驗使用之3個實驗用電纜17〜11之結構係將7 • 條外徑0.079inm之鍍銀軟銅線捻合，形成中心導體11，於此 . 中心導體之外周包覆FEP，以將介電體層12形成外徑為 翁 〇.7mm，於此介電體層12外周將91條相當於導體線13a之外 徑0.05mm之鍍錫軟銅線相對於同軸電纜之長軸方向以83 !〇 度之角度，橫向捲繞2層而形成外部導體層13，於此外部導 體層13之外周將藉由厚度2〜3/mi之PVC層疊厚度ΙΟμηι之鋁 箔及厚度12μιη之PET而形成之ALPET14a捲繞成螺旋狀，而 形成捲繞帶層14，於此捲繞帶層14之外周擠壓包覆由厚度 0.12mm之FEP構成之護套15而形成，此實驗用電纜F〜Η之 15 外徑為1.13mm。 φ 實驗用電纜F〜Η分別變更用以捲繞捲繞帶層14之角度 0，實驗用電纜F將捲繞帶層14相對於同軸電纜1之長軸方向 以19度之角度捲繞成螺旋狀，實驗用電纜G將捲繞帶層14 _ 相對於同軸電纜1之長軸方向以25度之角度捲繞成螺旋 20 狀，實驗用電纜Η將捲繞帶層14相對於同軸電纜1之長軸方 向以32度之角度捲繞成螺旋狀。在此衰減量實驗使用之比 較實驗用電纜Ε係不具實驗用電纜F〜Η之捲繞帶層14者。 從第8圖可知，比較實驗用電纜Ε之衰減量於5GHz時， 為4.94dB/m，於6GHz時，為5.58dB/m，相對於此，在具有 15 200837778 · •本實施形態同軸電纜1之特徵結構之實驗用電纜F〜Η中，實 驗用電纜F之衰減量於5GHz時，為4.21dB/m，於6GHz時， 為4.65dB/m，實驗用電纜G之衰減量於5GHz時，為 4.11dB/m，於6GHz時，為4.53dB/m，實驗用電鏡Η之衰減 5 量於5GHz時，為4.05dB/m，於6GHz時，為4.45dB/m。因而， 可知具有本實施形態同軸電纜1之特徵結構之實驗用電纜 F〜Η全體衰減量較比較實驗用同軸電纜減低。 又，從第8圖〜第10圖可知，在實驗用電纜F〜Η中，將 ^ 捲繞帶層14相對於同軸電纜之長軸方向以32度捲繞成螺旋 10 狀之實驗用電纜Η之衰減量及衰減量變動值最小，在實驗用 電纜F及實驗用電纜Η，衰減量產生約〇.2dB/m之差。因而， 可知本實施形態之同軸電纜1之衰減量較習知同軸電纜減 低，將外部導體層13橫向捲繞2層時，當捲繞捲繞帶層14之 角度^增大，衰減量可更減低。 15 又，實驗用電纜G之衰減量與實驗用電纜Η之衰減量之 φ 差約〇.〇6dB/m，其差小，衰減量變動在實驗用纜G與實驗用 電缆Η間幾乎無差。從此情形可知衰減量之減低於捲繞捲繞 帶之角度0在25〜32度之間、換言之在30度，衰減量之變化 幾乎呈平穩狀態，故以此3〇度為分界，而在某程度達最高 20 值。因此，即使捲繞捲繞帶層14之角度^在32度以上，衰減 量之值亦不致大幅變化，而可維持良好之狀態。如屏蔽實 驗之結果所敘述，當考慮生產性時，捲繞捲繞帶層14之角 度0以50度為上限。 在本實施形態之同軸電緵中，當外部導體層為捲繞2 16 200837778 泰 層牯，彳文第8圖〜第ι〇圖可知，衰減量較習知大幅提高，變 動ΐ縮小之捲繞帶層14之捲繞角度約25度。 以上’從此衰減量實驗之結果，捲繞捲繞帶層14之角 度0之下限為25度，50度為上限。當將衰減量及生產性列入 5考慮時，衰減置之變化幾乎呈平穩之30度以上、40度以下 . 可謂捲繞捲繞帶層14最佳之角度。 • 以上仗3種貝驗結果，捲繞捲繞帶層14之預定角度0 • 之範圍從所求之衰減量之值而言下限為25度，從生產性之 觀點而言，上限為50度。較佳之範圍在3〇度以上、4〇度以 10下可謂捲繞捲繞帶層14之最佳角度。 以上，由於上述本實施形態同軸電纜1之外部導體層13 以導體線13a橫向捲繞而形成，故富可撓性，同時，具較習 知同軸電纜高之屏蔽效果，衰減量亦減低。藉增大捲繞捲 繞帶層14之角度Θ，更提高屏蔽效果，更減低衰減量。這是 15由於當捲繞捲繞帶14之角度0增大時，捲繞帶層14捆緊外部 φ 導體層13之力增強，外部導體層13之導體線13a間之密合度 提高之故。當導體線13a間之密合度增高時，導體線⑸間 不易形成間隙。因此，可防止因導體線13a間形成間隙而產 纟之屏蔽效果減低，而提高屏蔽效果。再者，由於此捲繞 2〇帶層14WALPET14a形成，故此捲繞帶Η本身發揮屏蔽之作 用0 藉此，本實施形態之同軸電纜1包含外部導體層13及捲 繞帶層14具屏蔽效果之2個層，且外部導體層13之導體線 13a以捲繞帶層14捆緊，故提高導體13a之密合度，維持其 17 200837778 5 • 密合狀態，可更提高外部導體層13之屏蔽效果，亦可謀求 衰減低量之減低。 此外，在本實施形態中，捲繞帶層14以金屬化帶 ALPET14a形成。本發明之捲繞帶層不限於此。只要可捆 緊外部導體層，任何結構皆可。 本發明之同軸電纜任何機器皆可適用。舉例言之，電 腦、計算機、行動電話等電子機器皆可適用，將汽車、飛 機等之控制機器搭載於狹小部所需之機械之控制電路亦可 適用。 10 【圖式簡單說明3 第1(a)〜(c)圖係顯示本發明實施形態之同軸電纜1者。 第2圖係顯示同軸電纜1之屏蔽實驗結果之第1圖。 第3圖係顯示同軸電纜1之屏蔽實驗結果之第2圖。 第4圖係顯示同軸電纜1之捲繞實驗之實驗方法者。 15 第5圖係顯示同軸電纜1之捲繞實驗結果之第1圖。 • 第6圖係顯示同軸電纜1之捲繞實驗結果之第2圖。 第7圖係顯示同軸電纜1之捲繞實驗結果之第3圖。 第8圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 捲繞實驗結果之第1圖。 20 第9圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 捲繞實驗結果之第2圖。 第10圖係顯示外部導體層橫向捲繞2層之同軸電纜1之 捲繞實驗結果之第3圖。 【主要元件符號說明】 18 200837778 1...同軸電纜 13...外部導體層 11…中心導體(内部導體） 13a…導體線 11a…導體 14…捲繞帶層 12...介電體層 14a …ALPET 12a...介電體. 15…護套(保護披覆層) 19200837778 • Nine, invention description: [Technical field to which the invention pertains] Field of the invention The present invention relates to a coaxial power supply. 5 [Prior Art] BACKGROUND OF THE INVENTION It is known that in the coaxial cable, in order to improve the shielding effect and reduce the Φ of the attenuation amount, the outer conductor is wound at a certain angle with respect to the long axis direction of the coaxial cable. Electric layer. The applicant of the present invention has proposed that the outer conductor 10 is used for a metal such as a metal such as aluminum or copper, or a metal tape to which the metal foil is bonded (refer to Japanese Patent Laid-Open Publication No. 2000-057863) and the use of an external guide system. A coaxial cable of a plurality of conditional conductive wires (refer to Japanese Patent Laid-Open Publication No. 2003-092031). The coaxial cable of the patent publication No. 2000-057863 is wound from the dielectric layer 15 as a metal strip of an outer conductor, and the metal strip is wound at an angle of twentieth to 25 degrees with respect to the long axis direction of the coaxial electric φ cable. . Then, by winding the metal strip at an angle within a predetermined range, the coaxial electric iron of Japanese Patent Laid-Open Publication No. 2000-057863 can obtain a sufficient shielding effect, and further reduce the amount of attenuation. The coaxial cable of Japanese Patent Laid-Open Publication No. 2003-092031 is obtained by winding a plurality of conductive wires as an outer conductor into a spiral shape from a dielectric body, and the plurality of conductive wires are aligned with respect to the long axis of the coaxial cable. The direction is wound at an angle of 8 to 19 degrees. Then, by winding a plurality of conductive wires at an angle within a predetermined range, the coaxial cable of Japanese Patent Laid-Open Publication No. 2003-092031 can provide a coaxial cable excellent in electrical properties such as shielding effect. In the above coaxial cable, by winding a metal strip or a plurality of conductive wires as an outer conductor at a predetermined angle around the dielectric layer, sufficient shielding characteristics can be obtained, and the amount of attenuation can be reduced. In this case, the electronic equipment industry, which is improving the performance of the machine, is strongly expected to use a coaxial electric cable that has flexibility and high shielding characteristics, and that can reduce the attenuation and reduce the attenuation. SUMMARY OF THE INVENTION The present invention has been made in view of the above various problems, and an object of the invention is to provide a coaxial cable which has flexibility, has high shielding characteristics, reduces attenuation, and has small variations. To achieve the above object, the coaxial cable of the present invention comprises an inner conductor, a dielectric layer disposed on the outer periphery of the inner conductor, an outer conductor layer disposed on the outer periphery of the dielectric layer 15, and a protection disposed on the outer periphery of the outer conductor layer. a slope coating layer; and a winding belt layer formed of a winding belt wound around the outer conductor layer between the outer conductor layer and the protective coating layer, wherein the winding belt layer is oriented with respect to a long axis direction of the coaxial cable Wrap at a predetermined angle. Thereby, the coaxial cable of the present invention winds the winding tape from the outer conductor layer 20 of the coaxial cable. Therefore, since the outer conductor layer can be pressed by the winding tape, the outer conductor layer can be bundled, and the adhesion of the outer conductor layer can be improved to improve the shielding characteristics. Since the outer conductor can be bundled, when the coaxial cable is bent, the outer conductor layer is less likely to form a gap, and the state in which the shielding property is improved can be stabilized. Further, in the coaxial cable of the present invention, the winding tape is preferably a metallized belt. Thereby, since the wound tape layer is a shield layer, it has two shields of the outer conductor layer and the wound tape layer, and the shielding property can be further improved. Further, in this coaxial cable, the wound tape layer can be brought into close contact with the outer conductor layer, and the state in which the shielding characteristics are improved can be kept stable. In the coaxial cable of the present invention, the predetermined angle is preferably in the range of 25 to 50 degrees. Thereby, the coaxial cable of the present invention can maintain the production efficiency, and the outer conductor is bundled by the winding tape layer to improve the shielding property. In the coaxial cable of the present invention, the outer conductor layer is wound around one layer. Further, in the coaxial cable of the present invention, the outer conductor layer is wound laterally in two layers. Regardless of whether the outer conductor layer is wound by one or two layers, the wound tape can be wound from above and the outer conductor layer can be bundled. Therefore, the present invention can be applied even if the number of windings of the outer conductor layer is increased. BRIEF DESCRIPTION OF THE DRAWINGS 15 The first (a) to (c) drawings show a coaxial cable 1 according to an embodiment of the present invention. Fig. 2 is a first view showing the results of the shielding experiment of the coaxial cable 1. Fig. 3 is a second view showing the results of the shielding experiment of the coaxial cable 1. Fig. 4 is a view showing an experimental method of the winding test of the coaxial cable 1. Fig. 5 is a first view showing the results of the winding test of the coaxial cable 1. 20 Fig. 6 is a second view showing the results of the winding test of the coaxial cable 1. Fig. 7 is a third view showing the results of the winding test of the coaxial cable 1. Fig. 8 is a first view showing the results of the winding test of the coaxial cable 1 in which the outer conductor layer is wound laterally in two layers. Fig. 9 is a view showing a coaxial cable 1 in which an outer conductor layer is laterally wound by 2 layers. 200837778. Fig. 2 of the result of the winding test. Fig. 10 is a third view showing the result of the winding test of the coaxial cable 1 in which the outer conductor layer is wound laterally in two layers. [Embodiment 3] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In addition, the inventors of the embodiments described below are not limited to the necessity of the establishment of the present invention. First, the configuration of the coaxial cable 1 of the present embodiment will be described using Fig. 1 . Here, in Fig. 1, the first (a) is a perspective view of the coaxial cable 1 of the present embodiment, and the first (b) is a cross-sectional view of the coaxial cable 1 of the present embodiment, and the first (c). The figure shows the steps of winding the winding tape of the coaxial cable 1. As shown in Fig. 1, the coaxial cable 1 of the present embodiment has a center conductor 15 (internal conductor) 11, a dielectric layer 12, an outer conductor layer 13, and a winding layer 14 of the feature 0 of the present invention. The sleeve 15 (protection of the cover) is composed. This coaxial electrical access 1 is formed by the following procedure. That is, the coaxial cable 11 twists a plurality of conductors 11a to form a center conductor 11, and an extruder (not shown) is used in the outer periphery of the center conductor 11, and the dielectric layer 12a is extruded to form a dielectric layer 12. . Then, outside the dielectric layer 12, a plurality of conductor wires 13a are laterally wound to form an outer conductor layer 13' on the outer periphery of the outer conductor layer 13, and the metal is placed in a direction opposite to the lateral winding direction of the conductor 13a. The ALPET 14a (winding tape) of the tape is wound into a spiral shape to form a wound tape layer I4 which is a characteristic part of the present invention. Then, 8 200837778, which is wound around the belt layer 14, is formed by extrusion coating the sheath 15 at the outer periphery. In this way, the coaxial cable 1 is formed. The material of the coaxial cable 1 is exemplified. The material of the wire 11a is a silver-plated soft copper wire, the material of the dielectric body 12a is a tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP only), and the material of the conductor wire 13a is plated. Tin soft copper wire, sheath 15 of 5 material is FEP. Further, the material of the coaxial cable 1 of the present embodiment is not limited to the above materials, and other materials for coaxial cables may be used as usual. For example, ^ other dielectric resins such as polytetrafluoroethylene (PTFE) or tetrafluoroethylene-perfluoroethylene ether copolymer (PFA) may be used as the dielectric. In the coaxial electric core 10 1 of the present embodiment, the direction in which the winding belt layer 14 is wound is as long as the conductor wire 13a which is wound laterally as the outer conductor layer 13 can be wound in the lateral winding direction of the conductor 13a. • The same direction is also possible. Further, the ALPET 14a is formed by laminating an aluminum foil and polyethylene terephthalate (hereinafter simply referred to as PET) by polyvinyl chloride (hereinafter referred to simply as "PVC"). Then, the ALPET 14a is wound from the outer conductor layer 13 in a state where the aluminum foil is in contact with the outer conductor layer 13. In the coaxial cable 1 of the above-described embodiment, as shown in Fig. 1(c), the outer conductor layer 13 is formed by laterally winding the conductor wire 13a, and the outer conductor layer 13 is used to form the winding tape layer 14 from above. The ALPET14a is wound in a spiral shape at a predetermined angle 0 with respect to the coaxial electric power • 20 long axis direction. Therefore, the outer conductor layer 13 is thereby tightened by applying the stress of the winding belt layer 14, thereby increasing the adhesion between the conductor wires 13a of the outer conductor layer 13. Further, since the plurality of conductor wires are bundled by the winding tape layer 14, the tape layer 14 can be wound to maintain the state in which the conductor wires are in close contact, and even if the coaxial cable 1 is bent, the conductor wires 13a 9 200837778 can be suppressed. The curved portion is separated. Since the winding belt layer 14RALpET14a is formed, the winding belt layer 14 can also function as a shield. Accordingly, the coaxial cable of the present embodiment includes two layers having the outer conductor layer 13 and the wound belt layer 14 having an anchoring effect, and further, the five conductor wires 13a of the outer conductor layer 13 are bundled by the winding belt layer 14. Tightly, the adhesion between the conductor wires i3a can be improved, and the adhesion state can be maintained, and the shielding effect of the outer conductor layer 13 can be further improved. Next, an experiment was carried out in which the predetermined angle 卷绕 of the wound tape layer 14 of the coaxial cable of the present embodiment was wound, and the experiment was carried out using Fig. 2 to Fig. 1 for the experiment. In addition, in this experiment, a relationship between the predetermined angle 0 and the characteristic of the shielding effect is obtained to define a shielding experiment of the range of the predetermined angle $ and to determine the relationship between the predetermined angle and the attenuation amount to define Winding experiment with a predetermined angle of 0 range 2 experiments. The results of the screening test are shown in Fig. 2 and Fig. 3, and the experimental method of the winding experiment is shown in Fig. 4, and the experimental results of the winding experiment are shown in Fig. 5 to Fig. 10. First, use the 2nd and 3rd drawings to explain the screen experiment in detail. Fig. 2 shows the results of the experimental results of the shielding experiment, and Fig. 3 shows the experimental results of the shielding experiment. In this shielding experiment, a so-called absorption 20 clamp method is performed. This absorption jig method adjusts the four coaxial cables 1 having a predetermined angle 0 different from the winding and winding belt layer 14 to a length of 3 m as an experiment. The electric (Radi〇Frequency) network analyzer was used to detect the amount of the signal inserted into the experimental cables A to D leaking to the outside of the experimental cables A to D. In addition, the inserted signal changes sequentially from 0 Hz to 1 GHz, and the change in shielding effect between 200837778 is measured. In addition, the woven type of the same vehicle used in the prior art was similarly tested by the cable for comparison. In the shielding experiment, the four experimental cables A to D are used to check the structure of the ring-shaped silver soft copper wire with an outer diameter of 0.102 mm to form a center conductor 11. The outer conductor is covered with FEP to cover the center conductor. The dielectric layer 12 is formed to have an outer surface of 0.9 mm. On the outer periphery of the dielectric layer, 29 strips of the tinned soft copper wire corresponding to the conductor line 13a and < 〇·102 mm are 9 6 with respect to the long axis direction of the coaxial cable. The angle is 'laterally wound to form an outer conductor layer, and the outer circumference of the outer conductor 13 is formed by an aluminum case having a thickness of 2 to 3/rni, a thickness of 1 Ομιη of an aluminum case, and a thickness of 10 degrees 12 μηι of PET. Formed in a spiral shape, and the wound belt layer 14' is formed on the outer circumference of the wound belt layer 14 by extrusion coating a sheath 15 composed of FEP having a thickness of 0.12 mm. The outer diameter of the test cables a to d It is 1.37mm. The structure of the conventionally edited coaxial cable is to tie seven silver-plated soft copper wires with an outer diameter of 〇.i〇2mm 15 to form a center conductor, and the outer conductor of the center conductor is coated with FEP to form a dielectric layer. The outer diameter is 〇.8gmm, and a tinned soft copper wire having an outer diameter of 〇.〇5mm is used for the outer periphery of the dielectric layer, and an outer conductor layer is formed by a braid structure of a bundle number of 16 and a number of six, and the outer conductor layer is extruded outside the outer conductor layer. The press' cladding is formed by a sheath composed of a thickness of 1212mm2FEP. This conventional braided, 20-type coaxial electric slow-release outer diameter is 1.37mm. The test cables A to D were respectively changed to the angle at which the winding tape layer 14 was wound, and the experimental power cable A rolled the winding tape layer 14 at an angle of 20 degrees with respect to the long axis direction of the coaxial electric cable. Wrapped in a spiral shape, the experimental electric contact b winds the wound tape layer 14 at a 25-degree angle with respect to the long-axis direction of the coaxial cable 1 into a spiral 11 200837778 ★, and the experimental cable c compares the wound tape layer 14 The coaxial cable 1 was wound in a spiral shape at an angle of 30 degrees in the longitudinal direction of the coaxial cable 1, and the experimental cable D was wound into a position at an angle of 40 degrees with respect to the longitudinal direction of the coaxial electric cable 1. As can be seen from Fig. 2 and Fig. 3, the shielding effect of the entire experimental cables A to D having the ultra-fine structure of the coaxial electric device 5 of the present embodiment is higher than that of the woven-type coaxial cable. In addition, comparing the experimental cables A to D, the experimental cable a has a shielding effect of -51.7 dB when the signal is 10 MHz, and _48.5 dB when the signal is 100 MHz, and the experimental cable B has a signal of 10 MHz. When the signal is ioomhz, the shielding effect is 10 -49.8dB. When the signal cable C is 10MHz, the shielding effect is -53.4dB. When the signal is 100MHz, the shielding effect is -5. 〇.〇dB, when the signal D of the test cable is 10MHz, the shielding effect is _55·1 (1Β, when the signal is 100MHz, the shielding effect is -51.1dB. Therefore, it can be seen that the coaxial cable 本 of the embodiment has a comparison The shielding effect of the conventional coaxial electric 15 mirror is used to obtain a higher shielding effect when the angle 0 of the winding belt layer 14 is larger. That is, the effect of the shielding experiment is used for winding and winding. The angle of the belt layer 14 is preferably 20 or more. However, when the angle 0 of the winding is increased, the width of the ALPET 14a of the winding belt layer 14 is narrowed inversely proportional to the angle ', so the productivity of the coaxial cable 1 is lowered. Therefore, the angle at which the layer 12 of the winding tape 20 is wound ^ when considering productivity The upper limit is 50 degrees. Therefore, in the shielding test, the angle 0 for winding the winding tape layer 14 is 2 degrees or more and 50 degrees or less, which is a preferable angle. Next, using FIG. 4 to FIG. The winding experiment is explained in detail. Figure 4 is used to illustrate the experimental method of the winding experiment. First, use the 12th 200837778 4 diagram to explain the experimental method of the winding experiment. The winding experiment system will be used for the experiment. The cable was wound 12 times at intervals of 10 mm in the tube 20 of the outer diameter l〇mm, and the experimental cable for winding was inserted into the signals of 5 GHz and 6 GHz to measure the attenuation of the signal. 5 In this winding experiment, The test cables A to D which are the same as the shield test described in Fig. 2 and Fig. 3 and the two kinds of winding tests using the test cables F to 不同 different from the shield test were used. First, the fifth test was used. Fig. 7 shows the results of experiments using the same experimental cables a to d as the shielding experiment. 10 Fig. 5 shows the experimental results of the winding experiment, and Fig. 6 shows the winding experiment. The relationship between the attenuation amount and the winding angle 0 of the winding belt layer 14, FIG. The relationship between the fluctuation value of the attenuation amount of the winding test and the winding angle of the winding belt layer 14 is shown. In this winding experiment, the braided coaxial cable used in the conventional method is also similarly performed. Experiment, for comparison. 15 As can be seen from Fig. 5, the attenuation of the braided coaxial cable is 3.67 dB/m at 5 GHz and 4.03 dB/m at 6 GHz. In the experimental electric 緵A to D of the characteristic structure of the coaxial cable 1, the attenuation of the experimental electric power A is 3.36 dB/m at 5 GHz, 3.692 dB/m at 6 GHz, and the experimental cable B The attenuation is 20 3.305dB/m at 5GHz and 3.626dB/m at 6GHz. The attenuation of the experimental cable C is 3.233dB/m at 5GHz and 3.554dB/m at 6GHz. The attenuation of the experimental cable D was 3.192 dB/m at 5 GHz and 3.510 dB/m at 6 GHz. Therefore, it is understood that the total attenuation of the experimental cables A to D having the characteristic structure of the coaxial cable 1 of the present embodiment is lower than that of the woven coaxial cable 13 200837778. Further, as can be seen from Fig. 5 to Fig. 7, in the experimental cables a to D, the winding of the wound tape layer 14 with respect to the long axis direction of the coaxial cable was spirally wound at 40 degrees. The variation of the amount of attenuation and attenuation is the smallest. In the experimental power cable 5 and the experimental cable D, the attenuation amount is about 〇.2dB/m. Therefore, it can be seen that the attenuation amount of the coaxial cable 1 of the present embodiment is lower than that of the conventional coaxial cable. When the angle of the winding of the winding belt layer 14 is increased, the amount of attenuation can be further reduced. ^ The difference between the attenuation of the experimental cable C and the attenuation of the experimental cable D is about 0.04 dB/m, and the difference is small. When the attenuation amount fluctuates at 6 GHz, there is almost no difference. 10 From this situation, it can be seen that when the attenuation amount is less than the angle 0 of the winding and winding belt exceeds 30 degrees, the change in the attenuation amount is almost stable, so that the third degree is used as the boundary and reaches the highest value to some extent. Therefore, even if the angle 0 of winding the wound belt layer 14 is 40 or more, the value of the amount of attenuation does not largely change, and a good state can be maintained. As described in the results of the screening test, when the productivity is considered, the angle 0 of the wound 15 layer 14 is limited to 50 degrees. φ In the coaxial cable 1 of the present embodiment, as is apparent from Figs. 5 to 7, the attenuation amount is significantly increased as compared with the conventional one, and the winding angle of the winding belt layer 14 having a reduced amount of variation is about 25 degrees. From the above, as a result of the attenuation amount experiment, the lower limit of the angle of 20 degrees 0 of the wound winding tape layer 14 is 25 degrees, and 50 degrees is the upper limit. When the attenuation amount and productivity are taken into consideration, the change in the attenuation amount is almost 30 degrees or more and 40 degrees or less, which is the optimum angle for winding the winding belt layer 14. Next, using the drawing experiments of the other experimental cables, detailed description will be made using Figs. 8 to 1 . Figure 8 shows the results of the experiment using the other experimental cable F~Η14 200837778 * The results of the experiment, the figure 9 shows the attenuation and winding tape of the winding experiment using other experimental cables F~H Regarding the relationship of the winding angle $ of the layer 14, the tenth figure shows the relationship between the variation value of the attenuation amount of the winding test using the other experimental cable F~Η and the winding angle Θ of the winding belt layer 14. 5 The structure of the three experimental cables 17 to 11 used in this winding experiment is to tie 7 • silver-plated soft copper wires with an outer diameter of 0.079 inm to form a center conductor 11 , where the center conductor is coated with FEP. The dielectric layer 12 is formed to have an outer diameter of 7 mm. On the outer periphery of the dielectric layer 12, 91 tinned soft copper wires corresponding to an outer diameter of 0.05 mm of the conductor wire 13a are oriented with respect to the long axis direction of the coaxial cable. From the angle of the twist, two layers are wound laterally to form the outer conductor layer 13, and the outer circumference of the outer conductor layer 13 is formed by a thickness of 2 to 3/mi of a PVC laminated thickness of ΙΟμηι of aluminum foil and a thickness of 12 μm of PET. The ALPET 14a is wound into a spiral shape to form a wound belt layer 14, and the outer peripheral layer of the wound belt layer 14 is formed by extrusion coating a sheath 15 composed of FEP having a thickness of 0.12 mm. The experimental cable F~Η The 15 outer diameter is 1.13mm. φ The experimental cables F to Η are respectively changed to an angle 0 for winding the winding belt layer 14, and the experimental cable F winds the winding belt layer 14 at a 19-degree angle with respect to the long-axis direction of the coaxial cable 1. The test cable G is wound into a spiral shape at an angle of 25 degrees with respect to the long axis direction of the coaxial cable 1, and the test cable Η is used to wind the belt layer 14 with respect to the coaxial cable 1. The long axis direction is wound into a spiral at an angle of 32 degrees. In the case of this attenuation amount, the comparison test cable was used without the test cable F~Η. As can be seen from Fig. 8, the attenuation amount of the comparative test cable is 4.94 dB/m at 5 GHz and 5.58 dB/m at 6 GHz, whereas it has 15 200837778. • The coaxial cable 1 of this embodiment In the experimental cable F~Η, the attenuation of the experimental cable F is 4.21 dB/m at 5 GHz, 4.65 dB/m at 6 GHz, and the attenuation of the experimental cable G at 5 GHz. It is 4.11 dB/m, which is 4.53 dB/m at 6 GHz, and the attenuation of the experimental electron microscope is 4.05 dB/m at 5 GHz and 4.45 dB/m at 6 GHz. Therefore, it is understood that the total attenuation amount of the experimental cable F to 具有 having the characteristic structure of the coaxial cable 1 of the present embodiment is lower than that of the comparative experimental coaxial cable. Further, as is apparent from Fig. 8 to Fig. 10, in the experimental cable F to Η, the experimental tape 卷绕 of the winding tape layer 14 was wound into a spiral shape of 32 degrees with respect to the longitudinal direction of the coaxial cable. The attenuation amount and the attenuation amount variation value are the smallest. In the experimental cable F and the experimental cable Η, the attenuation amount is about 〇. 2 dB/m. Therefore, it can be seen that the attenuation amount of the coaxial cable 1 of the present embodiment is lower than that of the conventional coaxial cable, and when the outer conductor layer 13 is wound laterally by two layers, the angle of the winding of the winding belt layer 14 is increased, and the amount of attenuation can be further increased. reduce. 15 Moreover, the difference between the attenuation of the experimental cable G and the attenuation of the experimental cable 〇 is about 〇.〇6dB/m, and the difference is small. The variation of the attenuation is almost no between the experimental cable G and the experimental cable. difference. From this situation, it can be seen that the reduction of the attenuation amount is lower than the angle 0 of the winding and winding belt between 25 and 32 degrees, in other words, at 30 degrees, the change of the attenuation amount is almost stable, so that the boundary is 3, and at a certain The maximum level is 20. Therefore, even if the angle of winding the wound tape layer 14 is 32 or more, the value of the attenuation amount does not largely change, and a good state can be maintained. As described in the results of the screening test, when the productivity is considered, the angle 0 of the wound winding belt layer 14 is limited to 50 degrees. In the coaxial electric cymbal of the present embodiment, when the outer conductor layer is wound 2 16 200837778 泰 牯 牯 牯 牯 牯 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第The winding angle of the belt layer 14 is about 25 degrees. From the above, as a result of the attenuation amount experiment, the lower limit of the angle 0 of the wound winding belt layer 14 is 25 degrees, and 50 degrees is the upper limit. When the attenuation amount and productivity are included in the consideration of 5, the change in the attenuation is almost 30 degrees or more and 40 degrees or less. It can be said that the winding belt layer 14 is optimally angled. • The above three results of the test results, the predetermined angle of the winding and winding layer 14 is 0. The lower limit is 25 degrees from the value of the attenuation determined, and the upper limit is 50 degrees from the viewpoint of productivity. . Preferably, the range is above 3 degrees, and 4 degrees to 10 degrees is the optimum angle for winding the belt layer 14. As described above, since the outer conductor layer 13 of the coaxial cable 1 of the present embodiment is formed by winding the conductor wire 13a laterally, it is flexible and has a shielding effect higher than that of the conventional coaxial cable, and the amount of attenuation is also reduced. By increasing the angle 卷绕 of the wound winding layer 14, the shielding effect is further improved, and the amount of attenuation is further reduced. This is because when the angle 0 of the winding and winding belt 14 is increased, the force of winding the belt layer 14 to the outer φ conductor layer 13 is enhanced, and the adhesion between the conductor wires 13a of the outer conductor layer 13 is improved. When the adhesion between the conductor wires 13a is increased, it is difficult to form a gap between the conductor wires (5). Therefore, it is possible to prevent the shielding effect due to the formation of the gap between the conductor wires 13a and to reduce the shielding effect. Further, since the wound 2 〇 tape layer 14WALPET 14a is formed, the winding tape itself functions as a shield. Thus, the coaxial cable 1 of the present embodiment includes the outer conductor layer 13 and the wound tape layer 14 with a shielding effect. Two layers, and the conductor wire 13a of the outer conductor layer 13 is fastened by the winding tape layer 14, so that the adhesion of the conductor 13a is improved, and the adhesion state of the outer conductor layer 13 can be further improved by maintaining the adhesion state of the conductor 13a. It is also possible to seek to reduce the amount of attenuation. Further, in the present embodiment, the winding tape layer 14 is formed of a metallized tape ALPET 14a. The wound tape layer of the present invention is not limited thereto. Any structure is acceptable as long as the outer conductor layer can be bundled. The coaxial cable of the present invention can be applied to any machine. For example, an electronic device such as a computer, a computer, or a mobile phone can be applied, and a control circuit for a machine that mounts a control device such as a car or an airplane to a narrow portion can also be applied. 10 [Simple description of the drawings 3] The first (a) to (c) drawings show the coaxial cable 1 according to the embodiment of the present invention. Fig. 2 is a first view showing the results of the shielding experiment of the coaxial cable 1. Fig. 3 is a second view showing the results of the shielding experiment of the coaxial cable 1. Fig. 4 is a view showing an experimental method of the winding test of the coaxial cable 1. 15 Fig. 5 is a first view showing the results of the winding test of the coaxial cable 1. • Fig. 6 is a second view showing the results of the winding test of the coaxial cable 1. Fig. 7 is a third view showing the results of the winding test of the coaxial cable 1. Fig. 8 is a first view showing the results of the winding test of the coaxial cable 1 in which the outer conductor layer is wound laterally in two layers. Fig. 9 is a second view showing the results of the winding test of the coaxial cable 1 in which the outer conductor layer is wound laterally in two layers. Fig. 10 is a third view showing the result of the winding test of the coaxial cable 1 in which the outer conductor layer is wound laterally in two layers. [Description of main component symbols] 18 200837778 1...coaxial cable 13...external conductor layer 11...center conductor (internal conductor) 13a...conductor wire 11a...conductor 14...winding tape layer 12...dielectric layer 14a ...ALPET 12a...dielectric body. 15...sheath (protective coating) 19