543252 A7 B7 五、發明説明（ [發明的技術領域] 本發明係關於裝配於基板表面、且其端子殳冈定具固定 於基板背面之電連接器。 [先前技藝] 以往’如圖6所示，此種電連接器3〇中，固定具35會突出 於接觸基板31表面32之外殼33裝配面34，固定具35會以貫 通基板31之固定具插通孔36並固定於基板31之背面37的方 式，將電連接器30固定於基板31上。 另外，端子之導線39會突出於裝配面34上之一定下凹量 的凹部3 8 ’各導線3 9會穿過和基板3丨對應之插通孔4〇，並 突出至基板31之背面37。 [發明所欲解決之問題] 通常，在電連接器之製造過程中，會在圖6所示之狀態’ 例如，將其搬運至噴流式焊接方式（WAVE 自 動谇接裝置之連續爐内，導線3 9之前端雖然會被焊接於基 板32之背面3 7的導電部（圖上未標示）上，但有所謂焊劑上昇 之問題。 亦即，電連接器观搬運至連續爐内時，擴散至基板底 面背面37之焊劑會通過固定具插通孔％到達基板”之表面 32’接著向側面擴散至凹部38 ’然後，有可能通過外殼” 上之端子固定孔（圖上未標示）而到邊# 7々k ;叩則違端子之接點部（圖6中以 箭頭表示）。此時，可能產生端子接觸不良。- 本發明有鑑於前述課題，而以與祉叮十— 挺仏可確貫防止因焊劑上 -4- 本紙張尺度適财㈣家標準(CNS) A4規格(210 X 297^p---；^__ 2 五、發明説明（ 什而產生接觸不良之電連接器為目的。 [解決問題之手段] 為了達成前述目的， 、專利中請第^項之發明，係裝配於具有通往f面之端子插 通孔及固疋具裝配孔之基板表面的電連接器，其特徵係在 於，，備和前述基板表面相對之相對面而由合成樹脂製成 =外殼；此外殼之相對面含有接觸基板表面之左右一對的 衣配面、及位於此裝配面間並和基板表面間有一定間隙之 中間面，且具有由和外殼成一體之合成樹脂所構成、突出 於各裝配面、貝通基板之固定具裝配孔而固定於基板背面 的-對固定具、以及以橫向固定於外殼、並貫通中間面端 子固定孔及基板端子插通孔而焊接於基板背面之複數端子 ;前述相對面則含有區隔和前述外殼之裝配面相鄰接之中 間面的區隔溝。 本發明係利用區隔溝來隔開裝配面及中間面之連繫，在 自動焊接裝置之連續爐内’ M設擴散至基板f面之焊劑通 過固疋具插通孔到達裝配面，亦會停留於區隔溝内，而不 會到達中間面。因&，可確實防止因烊劑上升之影響而產 生端子接觸不良的問題。 專利申凊第2項之發明係針對專利申請第丨項之電連接器 ，其特徵在於，使前述外殼之相對面背面的連接側端面具 有以連結電連接為為目的之連結凹部，前述端子含有樺向 大出之彎曲狀突出部，該突出部係從外殼之相對面側穿過 端子固定孔插入並置入連結凹部内，突出部之頂部設有接 543252 A7 _________ B7 五、發明説明（3 ) 點部。 此時’在將端子裝配於外殼上時，端子固定孔必須通過 端子之突出部。因此，端子固定孔至少在突出部之突出方 向會較大。所以，萬一焊劑到達中間面時，雖然焊劑有容 易到達端子接點部之傾向，但因本發明可確實防止焊劑到 達中間面’故即使是此種型式之電連接器，亦可確實防止 焊劑上昇至接點部。 專利申請第3項之發明係針對申請專利範圍第1或2項之電 連接器’其特徵在於，前述裝配面設有開放溝，至少亦可 將固定具之周邊部開放至中間面的相反側。本發明時，在 自動焊接裝置之連續爐内，假設擴散至基板背面之焊劑通 過固定具插通孔到達裝配面，此焊劑亦會經過開放溝而被 排至中間面之相反側。結果，可以更確實地防止焊劑上昇 導致之端子接觸不良。 專利申請第4項之發明係針對申請專利範圍第1至3項中任 一項之電連接器，其特徵在於，前述區隔溝之深度及寬度 的和為3 mm以上。本專利發明者體認到，為了防止經由裝 配面侵入區隔溝内之焊劑到達中間面，相關之面距離是極 為重要的項目，故發現只要3 mm以上即可獲得絕佳效果。 [發明之實施形態] 麥照附錄圖面實施本發明之適當實施形態的說明。 圖1係將本發明之一實施形態電連接器裝配於基板之狀態 的部份斷面圖。圖2係沿圖！之ΙΙ-Π線的斷面圖，省略基板 之圖示。圖3係圖1之要部部份斷面的放大圖。 :297公釐） -6 543252 A7 ___ B7 五、發明説明（4 ~-- 首先’參照圖1可知，太雷々垃吳t人七 +冤連接為1含有裝配於基板2之表 面2a而由絕緣性合成樹脂構成之外殼3、以及在貫通此外殼 3之狀態下採2列橫向並列配置之端子列4, 5(圖丨只標示單側 端子列4。請參照圖2)。 蒼照圖1，外殼3之左右方向χ較長。外殼3具有和基板2表 面2 a相對之相對面6，此相對面6之左右方向χ的相對端部為 接觸基板2表面2a之成對裝配面7，7。在相對面6上，位於成 對之裝配面7，7間之中間面8位於裝配面7之凹陷位置，中間 面8及基板2表面2a間有一定之間隙。各端子列4(5)之各端子 突出於中間面8 ’從基板2表面2a貫穿至背面2b，並焊接於 基板2背面2b之導電部（圖上未標示）。 由和外殼3成一體之合成樹脂所構成的成對固定具9分別 形成輪轂狀並突出於成對裝配面7，7之外，各固定具9會穿 過固定具插通孔22由基板2表面2a貫通至背面2b，並固定於 背面2b。 本實施形態之特徵係為，在外殼3之相對面6上有橫向切 割相對面6、區隔各裝配面7及中間面8之區隔溝10，此區隔 溝1 〇即可防止焊接時之焊劑上昇。 參照圖2可知，端子列4係交互配列端子4 a尽端子4 b，如 圖2所示，端子4a及端子4 b只有其導線71，72之形狀不同而 已。同樣的，端子列5亦交互配列端子5a及端子5b，端子5a 及端子5b亦只有其導線73, 74之形狀不同而已。 參照圖1及圖2可知，外殼3之相對面6背面--連結側端面 U具有連結凹部1 2。連結凹部1 2係以插入並連接對象電連 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 543252 A7 B7543252 A7 B7 V. Description of the Invention ([Technical Field of the Invention] The present invention relates to an electrical connector which is mounted on the surface of a substrate and whose terminals are fixed to the back of the substrate. [Previous technology] The conventional method is shown in FIG. 6 In this electrical connector 30, the fixture 35 will protrude from the mounting surface 34 of the housing 33 that contacts the surface 32 of the substrate 31, and the fixture 35 will be fixed to the back surface of the substrate 31 with the fixture insertion hole 36 penetrating the substrate 31. 37 method, the electrical connector 30 is fixed on the substrate 31. In addition, the terminal wire 39 will protrude from the recessed portion 3 8 of a certain concave amount on the mounting surface 34, and each of the wires 39 will pass through and correspond to the substrate 3 丨The through hole 40 is projected to the back surface 37 of the substrate 31. [Problems to be Solved by the Invention] Generally, in the manufacturing process of the electrical connector, it will be in the state shown in FIG. 6 'For example, it is transported to Jet welding method (In the continuous furnace of the WAVE automatic welding device, although the front end of the wire 39 is welded to the conductive part (not shown) on the back surface 37 of the substrate 32, there is a problem of so-called flux rise.) That is, the electric connector 28 is transferred to the continuous furnace When inside, the flux that has diffused to the bottom surface 37 of the substrate will reach the surface 32 'of the substrate through the penetration hole of the fixture, and then diffuse to the recessed portion 38' to the side. Then, it may pass through the terminal fixing hole on the housing "(not shown in the figure) (Labeled) and to edge # 7々k; 叩 violates the contact portion of the terminal (indicated by an arrow in FIG. 6). At this time, a poor contact of the terminal may occur. — Tightness can surely prevent the flux on the paper -4- this paper size is suitable for financial standards (CNS) A4 specifications (210 X 297 ^ p ---; ^ __ 2 V. Description of the invention (even resulting in poor contact [Means for solving problems] In order to achieve the aforementioned purpose, the invention of item ^ in the patent is assembled on the surface of a substrate having a terminal insertion hole leading to the f-plane and a mounting hole for a fixture. The electrical connector is characterized in that the opposite surface of the substrate is made of synthetic resin = case; the opposite side of the case contains a pair of left and right matching surfaces that contact the surface of the substrate, and is located in the assembly There is a certain distance between the surface and the substrate surface The middle surface of the gap is composed of a synthetic resin integrated with the housing, protruding from each mounting surface, fixing holes of Beton substrate fixing holes, and fixed to the back of the substrate-a pair of fixing tools, and lateral fixing to the housing, The plurality of terminals are welded to the back surface of the substrate through the intermediate surface terminal fixing hole and the substrate terminal insertion hole; the aforementioned opposite surface includes an isolation groove that separates the intermediate surface adjacent to the assembly surface of the casing. The groove is used to separate the connection between the assembly surface and the intermediate surface. In a continuous furnace of an automatic welding device, the flux that is diffused to the f surface of the substrate is passed through the fixture insertion hole to the assembly surface, and it will stay in the separation groove. Without reaching the middle plane. With &, the problem of poor contact of the terminals due to the effect of rising tincture can be reliably prevented. The invention of item 2 of the patent application is directed to the electrical connector of item 丨 of the patent application, which is characterized in that the connection side end surface of the opposite side of the housing is provided with a connecting recess for the purpose of connecting electrical connection, and the terminal contains A large curved protrusion protruding from the birch, the protrusion is inserted from the opposite side of the casing through the terminal fixing hole and inserted into the connecting recess. The top of the protrusion is provided with a connection 543252 A7 _________ B7 V. Description of the invention (3 ) Click. At this time, when the terminal is assembled on the housing, the terminal fixing hole must pass through the protruding portion of the terminal. Therefore, the terminal fixing hole is larger at least in the protruding direction of the protruding portion. Therefore, even when the flux reaches the intermediate surface, although the flux tends to easily reach the terminal contact portion, the present invention can surely prevent the flux from reaching the intermediate surface. Therefore, even this type of electrical connector can reliably prevent the flux. Rise to the contact area. The invention of item 3 of the patent application is directed to the electrical connector of item 1 or 2 of the scope of patent application, characterized in that the aforementioned mounting surface is provided with an open groove, and at least the peripheral portion of the fixture can be opened to the opposite side of the middle surface . In the present invention, in a continuous furnace of an automatic soldering device, it is assumed that the flux diffused to the back surface of the substrate reaches the mounting surface through the fixture insertion hole, and this flux will also be discharged to the opposite side of the intermediate surface through the open groove. As a result, it is possible to more surely prevent the poor contact of the terminal caused by the rising of the flux. The invention of item 4 of the patent application is an electrical connector for any one of items 1 to 3 of the scope of patent application, characterized in that the sum of the depth and width of the aforementioned partition groove is 3 mm or more. The inventor of this patent realized that in order to prevent the flux intruding into the partition trench from reaching the intermediate surface through the mounting surface, the relevant surface distance is a very important item, and found that an excellent effect can be obtained as long as it is 3 mm or more. [Embodiments of the Invention] Mai Zhao appended the drawings to illustrate a suitable embodiment of the present invention. Fig. 1 is a partial cross-sectional view showing a state where an electrical connector according to an embodiment of the present invention is mounted on a substrate. Figure 2 is along the picture! The cross-sectional view of the II-II line is omitted from the illustration of the substrate. FIG. 3 is an enlarged view of a cross section of a main part of FIG. 1. : 297 mm) -6 543252 A7 ___ B7 V. Description of the invention (4 ~-First of all, referring to Figure 1, we can see that Tai Lei 々 t 七 7 + unjust connection is 1 containing the surface 2a assembled on the substrate 2 and A housing 3 made of insulating synthetic resin, and two rows of terminal rows 4, 5 arranged side by side in the state of penetrating the shell 3 (Figure 丨 only shows one-sided terminal row 4. Please refer to Figure 2). 1. The left and right direction χ of the housing 3 is longer. The housing 3 has an opposite surface 6 opposite to the surface 2 a of the substrate 2, and the opposite ends of the left and right directions χ of the opposite surface 6 are paired mounting surfaces 7 that contact the surface 2 a of the substrate 2 , 7. On the opposite surface 6, the intermediate surface 8 located between the pair of mounting surfaces 7, 7 is located in the recessed position of the mounting surface 7, and there is a certain gap between the intermediate surface 8 and the surface 2a of the substrate 2. Each terminal row 4 ( 5) Each terminal protrudes from the middle surface 8 'from the surface 2a of the substrate 2 to the back surface 2b, and is welded to the conductive portion (not shown in the figure) of the back surface 2b of the substrate 2. It is composed of a synthetic resin integrated with the housing 3. The pair of fixing fixtures 9 respectively form a hub shape and protrude beyond the pair of mounting surfaces 7 and 7, and each of the fixing fixtures 9 will pass through the fixing The insertion hole 22 penetrates from the surface 2a to the back surface 2b of the substrate 2 and is fixed to the back surface 2b. This embodiment is characterized in that the opposite surface 6 of the casing 3 has a transverse cutting opposite surface 6 and separates each assembly surface 7 And the partition groove 10 of the middle surface 8, this partition groove 10 can prevent the flux from rising during welding. Referring to FIG. 2, it can be seen that the terminal row 4 is an interactively arranged terminal 4 a and a terminal 4 b, as shown in FIG. 2. The terminals 4a and 4b differ only in the shape of the wires 71 and 72. Similarly, the terminal row 5 also alternately arranges the terminals 5a and 5b, and the terminals 5a and 5b differ only in the shapes of the wires 73 and 74. 1 and 2 show that the opposite side 6 of the housing 3-the connecting side end surface U has a connecting recessed portion 12. The connecting recessed portion 12 is for inserting and connecting the target electrical connector. This paper applies the Chinese National Standard (CNS) A4 standard. (210X 297 mm) 543252 A7 B7
接器插入凸部（圖上未標示）為目的之凹部，本電連接哭1為 所謂頂型構造。 參照圖2可知，外殼3上，區隔連結凹部丨2之前後成對固 定壁13，14上會以橫向並列方式形成端子固定溝15，各端子 固定溝内固定著對應各端子列4，5之端子。 連結凹部12之下方一外殼3之底部3a會形成分別固定各端 子列4, 5之端子的端子固定孔16。 端子4a含有置入連結凹部12之端子固定溝15内之長形主 體部17、以及設於該主體部1 7前端且彎曲成山形狀之突出 部18。利用此突出部17之頂部構成接點部19。另外，端子 4a具有連結於主體部17上且被用於壓入端子固定孔15之壓 入部20、以及連結於壓入部20上且形成向外殼3下方突出之 L字形狀的導線71。突出部17為外殼3之前後方向γ(圖2中為 左右方向），係向内突出。 雖然端子4b之構造和端子4a相同，但相對於端子4a之導 線71在外殼3之前方有較大的餘量，端子4b之導線72對後方 只有少許餘量，只有此點不同。 端子列5之端子5a在外殼3之前後方向Y和端子列4之端 子4a相對’其形狀則和端子列4之4b成前後對稱形狀。另 外，端子列5之端子5b在外殼3之前後方向Y和端子列4之 端子4b相對，其形狀則和端子列4之4a成前後對稱形狀。 如此，各導線71，72, 73，及74為均一分散’利用此方式， 在基板2背面2b可以防止各導線之焊接部份的干涉，並提 高安裝密度。 本紙張尺度適用中國國家標準(CNS) A4規格(21〇 X 297公釐) 543252 A7 厂 _ B7 五、發明説明（6 ) 例如，將端子4a組裝至外殼3時，端子4a之前端突出部18 會穿過外殼3底部3a之端子固定孔16，並插入連結凹部12内 。所以，端子固定孔16之斷面形狀上，前後方向γ之寬度必 須設定為可以穿過突出部17之量。因此，壓入部2〇壓入端 子固定孔16之狀態下，端子固定孔丨6内會有間隙。又，壓 入部2 0之壓入突起應朝外殼3之左右方向（圖2中為和紙面垂 直之方向）隆起。 參照圖3可知，為了讓各導線7丨〜74穿過基板2，端子插 通孔21仏攸基板2表面2a貫通至背面2b，同時，為了使固定 具9能穿過，固定具插通孔22亦必須貫。 固定具9係整體呈略圓柱狀之輪轂狀突起，具有利用開槽 23分割如成對之分割體24，25。成對之分割體24，25中，在 接近電連接器1端部之分割體24的前端’會形成向外的鉤26 ’各鉤26會固定於固定具插通孔22之邊緣。在圖，29係 使區隔溝10連通至連結凹部12内之側部的連通孔。 區隔溝3之斷面形狀為略矩形，區隔溝3之深度H(具體而 言’相當於從裝配面7之高度）及寬度w之和設定為3 mm以 上。例如，深度Η為2 mm時，則寬度W為1.7 mm。 其次，參照圖4及圖5來說明固定具9之基部周邊。裝配面 7上，以壓曲固定具9之基部周圍來形成開放溝27。此開放 溝27向左右方向X延伸，並朝外殼3之端部及區隔溝丨〇開放 。所以，裝配面7被分割成前後成對之部份7a, 。而在開 放溝2 7之底部形成之切入溝2 8，會延伸至固定具9之分割體 24範圍。又，前述連通孔29會朝開放溝27及區隔溝1〇之一 -9- 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐) ' -- 543252 A7 一 —__B7 五、發明説明（7 ) 部份開放。 利用本實施形態，以區隔溝10來隔開裝配面7及中間面8 之連繫，具有下述優點。亦即，如圖1所示，以固定具9將 電連接器1裝配於基板2表面2a之狀態下，將其移至自動焊 接裝置的連續爐内時，擴散至基板2背面2b之焊劑假設經由 固定具插通孔22到達裝配面7，也會積存於區隔溝1〇内，而 不會到達有端子固定孔16(參照圖2)之中間面8。所以，可以 確實防止因焊劑上昇影響所導致之端子4a等的接觸不良。 尤其是區隔溝10之深度Η及寬度W的和為3 mm以上，故 經由裝配面7到達中間面8之所謂連繫距離可以充份確保距 離，而可以確實防止焊劑到達裝配面8。 又，本實施形態中，將端子4a等裝配於外殼3上時，因突 出部18必須穿過端子固定孔16，端子固定孔16會較大，所 以，萬一焊劑到達中間面8時，雖然焊劑有容易到達接點部 19之傾向，但因如前面所述，故可確實防止焊劑到達中間 面8，具有十分良好之效果。 此外，因裝配面7設有開放溝27,可充份確保容納沿固定 具9上昇之焊劑的容積。而且，亦可經由開放溝”促使此焊 劑進入切入溝28及連通孔29，故整體而言，可確保相當大 容積來容納焊劑。結果，可確實防止焊劑到達中間面8=， 更可確實防止端子接觸不良之發生。 又，本發明並不限於前述實施形態而已，例如，亦可廢 除連通孔29。又，開玫溝27只對外殼3之端部側開即亦可。X 其他’在本發明範圍尚可以實施各種變更。 -10· 本紙張尺度適_ ® s家標準(CNS) A4規格(2lG χ 297公爱) — --- 543252 A7 _______Β7 五、發明説明（8 ) [圖式之簡單說明] 圖1係將本發明之一實施形態電連接器裝配於基板之狀態 的部份斷面圖。 圖2係沿圖1之IMI線的斷面圖。 圖3係圖1之要部斷面的放大圖。 圖4係從底面之相對面側觀察電連接器之概略斜視圖。 圖5係電連接器之底面圖。 圖6係傳統電連接器之概略斷面圖。 [符號之說明] 1 電連接器 2 基板 2a 表面 2b 背面 3 外殼 4, 5 端子列 4a，4b， 5a, 5b 端 6 相對面 7 裝配面 8 中間面 9 固定具 10 區隔溝 11 連結側端面 12 連結凹部 16 端子固定孔 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 543252 A7 B7 五、發明説明（9 ) 18 突出部 19 接點部 21 端子插通孔 22 固定具插通孔 27 開放溝 28 切入溝 29 連通孔 71, 72, 73, 74 導線 -12- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐）The connector is inserted into a concave portion (not shown in the figure) for the purpose. This electrical connection is a so-called top structure. Referring to FIG. 2, on the housing 3, the terminal fixing grooves 15 are formed on the fixing walls 13 and 14 in pairs in front and back to separate the connecting recesses 2 and 2. Terminal fixing grooves corresponding to the terminal rows 4 and 5 are fixed in the terminal fixing grooves. Of the terminal. A bottom fixing portion 3a of a housing 3 below the connecting recess 12 will form a terminal fixing hole 16 for fixing the terminals of the terminal rows 4, 5 respectively. The terminal 4a includes an elongated main body portion 17 which is inserted into the terminal fixing groove 15 of the connecting recessed portion 12, and a protruding portion 18 provided at the front end of the main body portion 17 and bent into a mountain shape. The top of this protruding portion 17 constitutes a contact portion 19. In addition, the terminal 4a has a press-fit portion 20 connected to the main body portion 17 and used to press-fit the terminal fixing hole 15, and an L-shaped lead wire 71 connected to the press-fit portion 20 and protruding downward from the case 3. The protruding portion 17 is the front-back direction γ of the housing 3 (the left-right direction in Fig. 2), and projects inwardly. Although the structure of the terminal 4b is the same as that of the terminal 4a, the lead 71 of the terminal 4a has a large margin in front of the housing 3, and the lead 72 of the terminal 4b has a slight margin to the rear, which is different only in this point. The terminal 5a of the terminal row 5 is opposite to the terminal 4a of the terminal row 4 in the front and rear directions Y of the housing 3, and its shape is symmetrical to the front and rear of the terminal row 4b. In addition, the terminal 5b of the terminal row 5 faces the terminal 4b of the terminal row 4 in the front-back direction Y of the housing 3, and its shape is symmetrical to the front and rear of the terminal row 4a. In this way, the wires 71, 72, 73, and 74 are uniformly dispersed. In this way, the back surface 2b of the substrate 2 can prevent interference of the welding portions of the wires and increase the mounting density. This paper size applies the Chinese National Standard (CNS) A4 specification (21〇X 297 mm) 543252 A7 factory_ B7 V. Description of the invention (6) For example, when the terminal 4a is assembled to the housing 3, the front end of the terminal 4a is 18 It will pass through the terminal fixing hole 16 on the bottom 3 a of the casing 3 and be inserted into the connecting recess 12. Therefore, in the cross-sectional shape of the terminal fixing hole 16, the width in the front-rear direction γ must be set so as to pass through the protruding portion 17. Therefore, in the state where the terminal-fitting hole 16 is pushed into the terminal-fitting portion 20, there is a gap in the terminal-fixing hole 丨 6. In addition, the press-in protrusion of the press-in portion 20 should be raised in the left-right direction of the casing 3 (the direction perpendicular to the paper surface in FIG. 2). Referring to FIG. 3, in order to let each of the wires 7 ˜ 74 pass through the substrate 2, the terminal insertion holes 21 pass from the front surface 2 a of the substrate 2 to the back surface 2 b. At the same time, in order to allow the fixture 9 to pass through, the fixture insertion holes are provided. 22 must also be done. The fixture 9 is a hub-like protrusion having a substantially cylindrical shape as a whole, and has a divided body 24, 25 divided into two by a slot 23, for example. Of the paired divided bodies 24 and 25, an outward hook 26 is formed near the front end of the divided body 24 near the end of the electrical connector 1, and each of the hooks 26 is fixed to the edge of the fixture insertion hole 22. In the figure, 29 is a communication hole that connects the partition groove 10 to a side portion connecting the recessed portion 12. The sectional shape of the partition groove 3 is slightly rectangular, and the sum of the depth H (specifically, 'equivalent to the height from the mounting surface 7) and the width w of the partition groove 3 is set to 3 mm or more. For example, when the depth Η is 2 mm, the width W is 1.7 mm. Next, the periphery of the base of the fixture 9 will be described with reference to FIGS. 4 and 5. An open groove 27 is formed on the mounting surface 7 by buckling around the base of the fixture 9. This open groove 27 extends in the left-right direction X, and is opened toward the end of the casing 3 and the partition groove 〇. Therefore, the assembling surface 7 is divided into front and rear pairs 7a,. The cut-in groove 2 8 formed at the bottom of the open groove 27 will extend to the range of the divided body 24 of the fixture 9. In addition, the aforementioned communication hole 29 will face one of the open groove 27 and the partition groove 10-9. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) '-543252 A7 A ---_ B7 V. Invention Note (7) is partially open. According to this embodiment, the connection between the mounting surface 7 and the intermediate surface 8 by the partition groove 10 has the following advantages. That is, as shown in FIG. 1, when the electrical connector 1 is mounted on the surface 2 a of the substrate 2 with the fixture 9, the flux is diffused to the back surface 2 b of the substrate 2 when it is moved to a continuous furnace of an automatic welding device. Reaching the mounting surface 7 through the fixture insertion hole 22 also accumulates in the partition groove 10 and does not reach the intermediate surface 8 having the terminal fixing hole 16 (see FIG. 2). Therefore, it is possible to surely prevent the contact failure of the terminals 4a and the like due to the influence of the flux rising. In particular, the sum of the depth Η and the width W of the partition groove 10 is 3 mm or more. Therefore, the so-called connection distance from the mounting surface 7 to the intermediate surface 8 can sufficiently secure the distance, and can reliably prevent the flux from reaching the mounting surface 8. In addition, in this embodiment, when the terminal 4a or the like is mounted on the housing 3, the protruding portion 18 must pass through the terminal fixing hole 16, and the terminal fixing hole 16 will be large. Therefore, if the flux reaches the intermediate surface 8, although The flux tends to easily reach the contact portion 19, but as described above, the flux can be reliably prevented from reaching the intermediate surface 8 and has a very good effect. In addition, since the mounting surface 7 is provided with an open groove 27, it is possible to sufficiently secure the volume for accommodating the flux rising along the fixture 9. In addition, the flux can also be caused to enter the cut-in trench 28 and the communication hole 29 through the open groove. Therefore, a large volume can be ensured to accommodate the flux as a whole. As a result, the flux can be reliably prevented from reaching the intermediate surface 8 =, and it can be prevented The occurrence of poor contact of the terminal. The present invention is not limited to the foregoing embodiment. For example, the communication hole 29 may be eliminated. Moreover, the opening groove 27 may be opened only to the side of the end of the housing 3. X Others Various changes can be made to the scope of the present invention. -10 · This paper is suitable for _ ® s House Standard (CNS) A4 specification (2lG χ 297 public love) — --- 543252 A7 _______B7 V. Description of the invention (8) [Schematic diagram Brief description] Fig. 1 is a partial cross-sectional view of a state where an electrical connector according to an embodiment of the present invention is assembled on a substrate. Fig. 2 is a cross-sectional view taken along the IMI line of Fig. 1. Fig. 3 is a summary of Fig. 1 Figure 4 is an enlarged perspective view of the electrical connector viewed from the opposite side of the bottom surface. Figure 5 is a bottom view of the electrical connector. Figure 6 is a schematic sectional view of a conventional electrical connector. [Symbol Description] 1 Electrical connector 2 Substrate 2a Surface 2b Back 3 Housing 4, 5 Terminal row 4a, 4b, 5a, 5b End 6 Opposite surface 7 Mounting surface 8 Middle surface 9 Fixture 10 Partition groove 11 Connection side end 12 Connection recess 16 Terminal fixing hole -11-This paper size applies to China Standard (CNS) A4 size (210 X 297 mm) 543252 A7 B7 V. Description of the invention (9) 18 Projection 19 Contact point 21 Terminal insertion hole 22 Fixture insertion hole 27 Open groove 28 Cut-in groove 29 Communication hole 71, 72, 73, 74 Wire-12- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)