200913422 九、發明說明： 【發明所屬之技術領域】 本發明係關於具有同軸電纜和連接器（端子部）的線 束，尤其是關於連接器中的接地棒和同軸電纜之屏蔽體（外 部導體部）的連接構造。 【先前技術】 在汽車等各種電子機器的內部中爲了使零件及基板之 間電氣連接而使用線束。尤其在手機及電腦等資訊機器 中，爲了高速傳送高容量的信號而利用使用同軸電纜的線 束，又爲了小型化、高密度組裝，在該同軸電纜中使用例 如所謂AWG#42的極細線。 線束的連接器之間，例如，極細線之複數條的同軸電 纜以狹小的節距排列的扁平纜線連接。連接此種複數條同 軸電纜的連接器，例如，係構成將各同軸電纜的屏蔽體經 由共同的接地棒設定共通電位。在此構成中，各屏蔽體和 接地棒以往係藉由壓接或銲接而進行電性連接。 、 [專利文獻1]日本特開2001-15242號公報 【發明內容】 [發明欲解決之課題 然而’壓接有不易取得穩定之電氣特性的問題。另一 方面’銲接用於塡補圓筒狀的屏蔽體和平面狀的電極之間 的間隙，可實現良好的電氣特性。然而，銲接有製程複雜 及產生環境污染物質之問題。 這點如特許文獻1所記載，例如，若使用像雷射融接 200913422 那樣的技術’具有能以無公害且穩定的電氣特性而實現電 線和電極之連接的可能性。又，電子束融接亦具有同樣的 可能性。例如，將同軸電纜的芯線（內部導體部）連接到電 極時，能使用雷射融接進行。然而，雷射融接和電子光束 融接基本上具有微細融接的特徵。因此，與芯線相較，當 對表面積大且圓筒狀的屏蔽體適用雷射融接等之時，變成 只能在屏蔽體和電極相接的微小面積作基本的融接之狀 態。結果’無法使屏蔽體全體良好地成爲均一的電位，而 有屏蔽體的效果降低之問題。又，藉由雷射融接將屏蔽體 熔化後’恐有對屏蔽體和芯線之間的內部介電體層造成傷 害的問題。 本發明是爲了解決上述問題點而開發者，係以提供： 關於屏蔽體和接地棒之連接，其製程對環境的影響輕微， 且可獲得良好的電氣特性之線束作爲目的。 【課題解決手段】 本發明相關的線束，係具有同軸電纜、和安裝於上述 同軸電纜的端子部者，上述端子部具有電性連接到在上述 同軸電纜的外部導體部之接地棒，上述接地棒爲由具有比 上述外部導體部更低熔點的材質製成，藉由使上述接地棒 熔融後進行固化而連接到上述外部導體部。 其他本發明相關的線束，具有：上述接地棒使用雷射 使上述接地棒熔融固化而連接到上述外部導體部之構造。 本發明較佳的形態，係上述外部導體部爲銅或銅合金 所製成且上述接地棒爲黃銅或鋁所製成之—種線束。 200913422 又’本發明之線束的上述端子部，在內部具有抓住上 述接地棒的威體’上述殼體可作成具有下列構造：露出橫 跨上述同軸電續而延伸的上述接地棒之中與上述同軸電纜 交叉之範圍的開口部。 又’本發明的線束可作成下列構造：具有：屬於上述 接地棒的第1接地棒、和第2接地棒，上述第1接地棒、 上述同軸電纜及上述第2接地棒具有成爲三明治構造的部 分。 [發明效果] 根據本發明’可作成因接地棒與外部導體部相比較熔 點低’以雷射等照射接地棒且加熱而進行接地棒與外部導 體部的熔接時，可使加熱處的接地棒適當地熔融，另一方 面’使外部導體部爲幾乎未熔融的狀態。在此狀態中，一 面抑制向內部介電體層之熱傳導，尤其是在接地棒加熱處 附近位置之內部介電體層局部加熱，並藉由擴大接地棒的 熔融點’或熔融的構件將外部導體部和接地棒之間的空隙 加以塡充’可擴大接地棒和外部導體部的接觸面積。即， 在本發明之線束的構造中，不使用對環境影響大的銲材等 之材料’可使外部導體部和接地棒進行良好的電性連接。 【實施方式】 &下，將根據圖式針對本發明的實施形態（以下稱實施 形態）進行說明。 第1圖爲實施形態之線束的模式立體圖。線束2係由 電纜部4、及分別設置於其兩端的連接器部6組成。例如， 200913422 電續部4爲由平行排列的複數條同軸電纜組成的扁平纜 線。連接器部6的形狀係依據殻體8而決定，例如，構成 陽連接器者係被稱爲插頭殼體者，另一方面，構成陰連接 器者係被稱爲插座殼體。例如，第1圖顯示的連接器部6 爲陽連接器，並嵌合於安裝在基板等（未圖示）的陰連接器。 第2圖爲顯示連接器部6構造的模式圖。連接器部6 含有殼體8、接地棒1〇、及電纜部4之端部而構成。 將構成電纜部4的各同軸電纜1 2端部加以剝線，從以 外部被覆14包覆的部分朝前端依序地設置露出屏蔽體 1 6、內部介電體層1 8、芯線2 0的露出部分。又，在剝線中， 切割外部被覆1 4和內部介電體層1 8之步驟，可使用被稱 爲雷射剝線器的裝置而以高生產性進行。該裝置係使用C〇2 雷射’不會傷害到位於外部被覆1 4和內部介電體層1 8之 下的金屬部（屏蔽體1 6或芯線2 0 )，且可選擇性地切割外部 被覆14或內部介電體層18。又，切割屏蔽體16之步驟可 使用YAG雷射或YV〇4雷射等被稱爲雷射屏蔽體切割器的 裝置而以高生產性進行。 排列於電纜部4的寬度方向的複數個屏蔽體1 6，被從 電纜部4的一方面側之接地棒1 0a，以及從反對面側之接地 棒10b所緊貼。 接地棒10爲具有與露出於電纜部4之端部的屏蔽體16 之長度對應的寬度、和比電纜部4的寬度更大的長度之細 長板狀構件。接地棒1 〇在屏蔽體1 6的露出部分交叉並橫 跨電纜部4延伸，且共通地連接在各屏蔽體16，並將各個 200913422 屏蔽體1 6設定在共通的接地電位。接地棒1 〇爲了擴大與 圓筒狀的屏蔽體16表面之接觸面積，在與屏蔽體16抵接 的位置預先形成凹部24。 殻體8，例如係由2個殼體零件8 a，8 b所構成。例如， 殼體零件8b在內側形成收容電纜部4之端部或接地棒1 0 的凹部2 6。又，在凹部2 6中配置與各同軸電纜12之芯線 20連接的電極墊22。 殻體零件8a係以包覆安裝於殻體零件8b的電纜部4 之端部等的方式，而與殻體零件8 b組合。在本實施形態 中’接地棒1 Ob可預先安裝於在殼體零件8b的屏蔽體1 6 之預定位置。又，同樣地，接地棒l〇a可預先安裝在殻體 零件8a。若使用如此預先裝配接地棒1〇的殼體零件8a，8b 的話，可簡化連接器部6之組裝作業。 在將接地棒1 0預先安裝在殼體零件8 a，8b之構成中， 藉由在殻體零件8b的凹部26安裝電纜部4之端部，將殼 體零件8a組裝於殼體零件8b，屏蔽體16形成被接地棒10a， 1 〇b夾持的三明治構造。爲了作成使後述之雷射熔接爲可 行’在使用此構成中的殻體零件8a, 8b設置將接地棒10a， l〇b的表面之中與電纜部4交叉的範圍露出的開口部28a, 28b ° 第3圖爲顯示電纜部4和接地棒丨〇之位置關係的模式 平面圖。又’第4圖爲組裝後之連接器部6的模式垂直剖 面圖’係顯示與在第3圖所示的直線A-A’之位置對應的 剖面。殼體8在內部抓住接地棒1 〇及電纜部4的端部。又， 200913422 殼體零件8a，8b，挾持接地棒10a, 1 Ob之長度方向2 並將兩接地棒1 0朝屏蔽體1 6彈迫。藉此，接地棒1 可壓接於屏蔽體1 6。在此狀態，將雷射從連接器部 部經由開口部28a，28b照射在接地棒1 〇a，] Ob，使 10熔接在屏蔽體16。 在此，對接地棒1 0使用比屏蔽體1 6更低熔點& 大多之情況，屏蔽體16係由銅（或銅合金）構成。相 屏蔽體1 6，例如，接地棒10係由黃銅或銘形成。 1 0的厚度係考慮到適於雷射熔接之進行或強度等而 例如可作成5 0 μ m的程度。又，以雷射來說例如， Y A G雷射和光纖雷射等。 第5圖爲顯示屏蔽體16和接地棒10之交叉部 式平面圖。屏蔽體16具有以微細之銅線形成的編緯 構成該編織的各銅線沿著同軸電纜1 2之軸而形成蹈 示第5圖的屏蔽體1 6部分的斜線係表現出此編織_ 3 〇顯示雷射熔接處。在該處照射雷射脈衝，一直到 1 〇之裡面都熔融。此時，因爲屏蔽體16之熔點比 10更高，可一面抑制屏蔽體16之熔融，一面圖謀將 1 〇的熔融點向橫方向擴大。又，熔融後的接地棒1 0 浸潤、擴散在屏蔽體1 6的編織構造，藉此可達成熔 之擴大。 接地棒1 0和屏蔽體1 6的雷射熔接，係可在接 的寬度範圍中，朝同軸電纜1 2之軸方向錯開的複數 3 0處進行。又，也可在朝接地棒丨〇的長度方向錯開 :端部， 0a, 1 0b 6的外 接地棒 ί)材料。 對於此 接地棒 規定， 可使用 分的模 丨構造， 【旋。顯 I造。點 接地棒 接地棒 接地棒 之材料 接面積 地棒1 0 個地點 的複數 -10- 200913422 個位置上進行雷射照射而熔接。如此，藉由增加點3 0的數 量，接地棒1 〇和屏蔽體1 6可更良好地作電性連接。若更 具體地描述時，藉由增加點3 0的數量，更多構成屏蔽體1 6 之編織的銅線與接地棒1 0熔接，而提高屏蔽體1 6的電位 均一性。又，如本實施形態般，以接地棒1 〇將屏蔽體16 作成三明治狀態，將各個接地棒1 〇雷射熔接到屏蔽體1 6， 對屏蔽體1 6的電位之均一性的提高也是有效。 此外，屏蔽體1 6的構造並不限定於編織構造，例如， 在捲繞爲全部平行地螺旋狀之構造時也可得到上述的效 果。 在上述實施形態中係顯示，在組裝連接器部6後，再 從開口部28a，28b實施雷射熔接之構成。但，也可作成： 將接地棒1 0雷射熔接於屏蔽體1 6後，才收容至殼體零件 8a，8b的構成。此時，也可不必在殼體零件8a, 8b設置開 口部28a，28b。又，也可作成使接地棒10只連接於屏蔽體 I 6之單側的構成。 上述接地棒10,雖然爲預先形成凹部24的構造，但也 可作成下列之構成：由柔軟的構件將接地棒1 0製成平板， 藉由將其推壓入屏蔽體1 6，使接地棒1 0表面塌陷，使接地 棒1 0和屏蔽體1 6的接觸面積增加。例如，此構成可藉由 使用2個接地棒10挾持屏蔽體16而形成三明治構造，並 按壓此三明治構造而實現。 【圖式簡單說明】 第1圖爲本發明實施形態的線束之模式立體圖。 -11- 200913422 第2圖爲顯示連接器部構造的模式圖。 第3圖爲顯示電纜部和接地棒之位置關係的模式平面 圖。 第4圖爲連接器部的模式垂直剖面圖。 第5圖爲顯示同軸電纜的屏蔽體和接地棒的交差部分 之模式平面圖。 【主要元件符號說明】 2 線束 4 電纜部 6 連接器部 8 殼體 8a，8 b 殼體零件 10，10a，10b 接地棒 12 同軸電纜 14 外部被覆 16 屏蔽體 18 內部介電體層 20 芯線 22 電極墊 24,26 凹部 28a,28b 開口部 30 點200913422 IX. OBJECTS OF THE INVENTION: TECHNICAL FIELD The present invention relates to a wire harness having a coaxial cable and a connector (terminal portion), and more particularly to a shield for a ground rod and a coaxial cable in a connector (outer conductor portion) Connection structure. [Prior Art] A wire harness is used in order to electrically connect a component and a substrate in various electronic devices such as automobiles. In particular, in an information machine such as a mobile phone or a computer, a wire harness using a coaxial cable is used for high-speed transmission of a high-capacity signal, and a very thin wire such as the so-called AWG #42 is used for the coaxial cable for miniaturization and high-density assembly. Between the connectors of the harness, for example, a plurality of coaxial cables of extremely thin wires are connected by a flat cable arranged in a narrow pitch. A connector for connecting such a plurality of coaxial cables, for example, is configured to set a common potential of the shields of the respective coaxial cables via a common ground rod. In this configuration, each of the shield and the grounding rod are electrically connected by crimping or welding. [Patent Document 1] JP-A-2001-15242 SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] However, there is a problem in that it is difficult to obtain stable electrical characteristics by crimping. On the other hand, the welding is used to fill the gap between the cylindrical shield and the planar electrode to achieve good electrical characteristics. However, welding has problems with complicated processes and environmental pollutants. This is described in Patent Document 1, for example, if a technique such as laser fusion 200913422 is used, it is possible to realize connection of a wire and an electrode with no pollution and stable electrical characteristics. Moreover, electron beam fusion has the same possibility. For example, when the core wire (internal conductor portion) of the coaxial cable is connected to the electrode, laser fusion can be performed. However, laser fusion and electron beam fusion are essentially characterized by fine fusion. Therefore, when the shielded body having a large surface area and a cylindrical shape is subjected to laser fusion or the like as compared with the core wire, it becomes a state in which the shield body and the electrode are connected to each other in a substantially fused state. As a result, there was a problem that the entire shield body could not be uniformly formed into a uniform potential, and the effect of the shield body was lowered. Further, after the shield is melted by laser fusion, there is a problem that the internal dielectric layer between the shield and the core wire is damaged. The present invention has been made in order to solve the above problems, and provides a connection between a shield and a ground rod, a process in which the influence of the process on the environment is slight, and a wire harness having good electrical characteristics can be obtained. [Means for Solving the Problems] The wire harness according to the present invention includes a coaxial cable and a terminal portion attached to the coaxial cable, and the terminal portion is electrically connected to a ground rod of an outer conductor portion of the coaxial cable, and the ground rod The material is made of a material having a lower melting point than the outer conductor portion, and is solidified by melting the ground rod to be connected to the outer conductor portion. Another wire harness according to the present invention has a structure in which the ground bar is melted and solidified by using a laser to be connected to the outer conductor portion. In a preferred embodiment of the present invention, the outer conductor portion is made of copper or a copper alloy, and the ground rod is made of brass or aluminum. 200913422 Further, the terminal portion of the wire harness of the present invention has a core body for grasping the ground rod inside. The casing may have a structure in which the ground rod extending across the coaxial electric continuity is exposed and the above The opening of the range in which the coaxial cable crosses. Further, the wire harness of the present invention may have the following structure: a first ground bar belonging to the ground bar and a second ground bar, wherein the first ground bar, the coaxial cable, and the second ground bar have a sandwich structure . [Effect of the Invention] According to the present invention, it is possible to make the ground rod of the heating portion by the fact that the ground rod is lower in melting point than the outer conductor portion, and the ground rod is irradiated with a laser or the like and heated to perform welding of the ground rod and the outer conductor portion. The melt is appropriately melted, and on the other hand, the outer conductor portion is in a state of being almost unmelted. In this state, heat conduction to the inner dielectric layer is suppressed, especially local heating of the inner dielectric layer at a position near the ground rod heating, and the outer conductor portion is expanded by expanding the melting point of the ground rod or the molten member. The gap between the ground rod and the ground rod is filled to expand the contact area between the ground rod and the outer conductor portion. In other words, in the structure of the wire harness of the present invention, the outer conductor portion and the ground rod can be electrically connected without using a material such as a welding material having a large influence on the environment. [Embodiment] An embodiment (hereinafter referred to as an embodiment) of the present invention will be described with reference to the drawings. Fig. 1 is a schematic perspective view of a wire harness of an embodiment. The wire harness 2 is composed of a cable portion 4 and a connector portion 6 provided at both ends thereof. For example, 200913422 Electrical Continuation 4 is a flat cable consisting of a plurality of coaxial cables arranged in parallel. The shape of the connector portion 6 is determined depending on the casing 8. For example, a person who constitutes a male connector is referred to as a plug housing, and a person who constitutes a female connector is referred to as a socket housing. For example, the connector portion 6 shown in Fig. 1 is a male connector and is fitted to a female connector mounted on a substrate or the like (not shown). Fig. 2 is a schematic view showing the structure of the connector portion 6. The connector portion 6 includes a case 8 , a ground bar 1 , and an end portion of the cable portion 4 . The end portions of the coaxial cables 1 2 constituting the cable portion 4 are stripped, and the exposed portions of the shield body 16 , the internal dielectric layer 18 , and the core wire 20 are sequentially disposed from the portion covered with the outer covering 14 toward the front end. section. Further, in the stripping, the step of cutting the outer covering 14 and the inner dielectric layer 18 can be carried out with high productivity using a device called a laser stripper. The device uses a C〇2 laser' to not damage the metal portion (the shield 16 or the core 20) located under the outer cladding 14 and the inner dielectric layer 18, and can selectively cut the outer coating. 14 or internal dielectric layer 18. Further, the step of cutting the shield 16 can be carried out with high productivity using a device called a laser shield cutter such as a YAG laser or a YV〇4 laser. The plurality of shields 16 arranged in the width direction of the cable portion 4 are closely contacted from the ground rod 10a on the one side of the cable portion 4 and the ground rod 10b on the opposite side. The ground rod 10 is a thin plate-shaped member having a width corresponding to the length of the shield 16 exposed at the end of the cable portion 4 and a length larger than the width of the cable portion 4. The grounding bars 1 are crossed at the exposed portions of the shields 16 and extend across the cable portion 4, and are commonly connected to the respective shields 16, and the respective 200913422 shields 16 are set at a common ground potential. In order to enlarge the contact area with the surface of the cylindrical shield 16, the ground bar 1 has a recess 24 formed in advance at a position in contact with the shield 16. The housing 8 is, for example, composed of two housing parts 8 a, 8 b. For example, the case member 8b has a recess portion 26 that accommodates the end portion of the cable portion 4 or the ground bar 10 on the inner side. Further, an electrode pad 22 connected to the core wire 20 of each coaxial cable 12 is disposed in the recessed portion 26. The case member 8a is combined with the case member 8b so as to be wrapped around the end portion of the cable portion 4 of the case member 8b. In the present embodiment, the ground rod 1 Ob can be previously mounted at a predetermined position of the shield 16 of the casing member 8b. Further, similarly, the ground bar 10a can be attached to the casing member 8a in advance. The assembly work of the connector portion 6 can be simplified by using the case parts 8a, 8b in which the ground rods 1 are pre-assembled. In the configuration in which the ground rod 10 is previously attached to the case parts 8a, 8b, the end portion of the cable portion 4 is attached to the recess 26 of the case member 8b, and the case member 8a is assembled to the case member 8b. The shield 16 forms a sandwich structure sandwiched by the ground rods 10a, 1 〇b. In order to make the laser welding to be described later possible, the housing parts 8a, 8b using the above-described configuration are provided with openings 28a, 28b which expose the range of the ground rods 10a, 10b which intersect the cable portion 4. ° Fig. 3 is a schematic plan view showing the positional relationship between the cable portion 4 and the ground rod. Further, Fig. 4 is a schematic vertical cross-sectional view of the assembled connector portion 6 showing a cross section corresponding to the position of the straight line A-A' shown in Fig. 3. The housing 8 grips the ground rod 1 and the end of the cable portion 4 inside. Further, 200913422, the housing parts 8a, 8b hold the ground rod 10a, 1 Ob in the longitudinal direction 2 and urge the two ground rods 10 toward the shield 16. Thereby, the ground rod 1 can be crimped to the shield 16. In this state, the laser is irradiated from the connector portion to the ground rod 1 〇a,] Ob via the openings 28a, 28b, and the 10 is welded to the shield 16. Here, the ground rod 10 is used at a lower melting point than the shield 16 . In most cases, the shield 16 is made of copper (or a copper alloy). The phase shield 16 is, for example, formed by brass or stencil. The thickness of 10 is, for example, suitable for the progress or strength of the laser welding, for example, to a degree of 50 μm. Also, for lasers, for example, Y A G lasers and fiber lasers. Fig. 5 is a plan view showing the intersection of the shield 16 and the ground rod 10. The shield body 16 has a weft-like structure formed of a fine copper wire, and each of the braided copper wires is formed along the axis of the coaxial cable 12 to form a shielded body of the fifth embodiment. 〇The laser weld is displayed. The laser pulse is illuminated there and melts up to 1 inch. At this time, since the melting point of the shield 16 is higher than 10, the melting point of the shield 16 can be suppressed, and the melting point of 1 〇 can be enlarged in the lateral direction. Further, the molten ground rod 10 is wetted and diffused in the braided structure of the shield 16 to thereby achieve expansion of the melt. The laser welding of the ground rod 10 and the shield 16 can be performed at a plurality of positions shifted in the axial direction of the coaxial cable 12 in the width range of the connection. Alternatively, it may be staggered toward the length of the ground rod :: the end portion, 0a, 10b 6 of the external ground rod ί) material. For this ground rod specification, a sub-module construction can be used, [spin. I made it. Point Grounding rod Grounding rod Material of the grounding rod Connection area Number of ground rods 10 locations -10- 200913422 Laser irradiation at locations. Thus, by increasing the number of points 30, the ground rod 1 〇 and the shield 16 can be electrically connected more well. More specifically, by increasing the number of dots 30, more of the braided copper wire constituting the shield 16 is welded to the ground bar 10, and the potential uniformity of the shield 16 is improved. Further, as in the present embodiment, the shield 16 is sandwiched by the ground bar 1 ,, and each ground bar 1 is laser-welded to the shield 16 , and the uniformity of the potential of the shield 16 is also effective. . Further, the structure of the shield 16 is not limited to the woven structure, and the above-described effects can also be obtained, for example, when the structure is wound in a spiral shape in all directions. In the above embodiment, after the connector portion 6 is assembled, the laser welding is performed from the openings 28a and 28b. However, it is also possible to form a structure in which the ground rod 10 is laser-welded to the shield 16 and then housed in the casing parts 8a, 8b. At this time, it is not necessary to provide the opening portions 28a, 28b in the casing parts 8a, 8b. Further, the ground rod 10 may be connected only to one side of the shield I 6 . The ground rod 10 has a structure in which the concave portion 24 is formed in advance, but may be configured as follows: the ground rod 10 is formed into a flat plate by a soft member, and is pushed into the shield body 16 to make the ground rod The surface collapse of 10 causes the contact area of the ground rod 10 and the shield 16 to increase. For example, this configuration can be realized by forming the sandwich structure by holding the shield 16 using the two ground rods 10 and pressing the sandwich structure. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a mode of a wire harness according to an embodiment of the present invention. -11- 200913422 Fig. 2 is a schematic view showing the structure of the connector portion. Figure 3 is a schematic plan view showing the positional relationship between the cable portion and the ground rod. Figure 4 is a schematic vertical cross-sectional view of the connector portion. Fig. 5 is a schematic plan view showing a cross section of a shield of a coaxial cable and a ground rod. [Main component symbol description] 2 Harness 4 Cable section 6 Connector part 8 Housing 8a, 8 b Housing parts 10, 10a, 10b Grounding rod 12 Coaxial cable 14 External coating 16 Shield 18 Internal dielectric layer 20 Core 22 Electrode Pad 24, 26 recess 28a, 28b opening 30 points