200842421 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種於主光纜中併設有用以與用戶引入光 纜連接之分支光纜之光纜。 【先前技術】 資訊量因網際網路之快速普及而增大，資訊通信之高速 - 化不斷發展。最近，正在構築大容量且雙向之光網路，且 正實行FTTH (Fiber To The Home，光纖到家）服務，該 φ FTTI^^務藉由光纖而使通信供應商與各家庭直接連接， 以提供高速通信服務。因此，於主光纜中併設有單心或者 複數心之分支用光纖之光纜之需求增加，該分支用光纖用 以連接引入用戶住宅内之光纜。 於曰本專利特開平7-128554號公報中揭示有該光纜之一 例。所揭示之光纜中，以張力構件為中心而合併多心之光 纜（主光纜）與少心之光纜，並藉由綁帶捆紮上述光纜而實 現一體化。光纜之長度通常對應於100〜3〇〇瓜之配線跨 _ 距’且於每個連接點處，經由接線盒而連接複數根光纜， 藉此鋪設複數根光纟覽。於接線盒中，少心之光纟覽與主光鏡 ^ 之光纖連接。 然而，該光纜中，少心之光纜無法直接與用戶引入光纜 連接。因此，連接少心之光纜與用戶引入光纜時，必須進 行光纖心線之取出作業以及光纖之連接作業。因此，分支 作業需要花費時間。又，必須將收容少心之光繞與引入光 繞之光纖連接部之接線盒安裝於光纜主體，因此需要上述 1302I3.doc 200842421 接線盒之設置空間。 專利文獻1:日本專利特開平7_128554號公報 【發明内容】 發明所欲解決之問題 本發明之目的在於提供—種易於進行現場之分支作業且 無需接線盒之光纜。 Μ 解決問題之技術手段 為實現上述㈣’本發明提供一種光纜，其交替地包 含.⑴由主光纜與分支光纜構成之線條部，上述主光纜中 收容有複數根主線域，上述分支㈣-體併設於主光緵 且收容有-根或複數根分支光纖；以及⑺分支部，盆對分 支光纖與複數根主線光纖中之所期望之主線光纖騎光: 連接。 本發明之㈣中，較佳的是由護罩來覆蓋分支部。護罩 可為熱縮管、由塑膠樹脂形成之半套管、以及自主光纜切 下之光纜外覆皮中之任一者。較佳的是，分支部之外：盘 主體光瘦之外徑大致相等，且於護罩上設置有用以導出I 支光纜之導出部。 出刀 -ϋ土的疋，主光纜除了包含複數根主線光纖之外，亦包 3緩衝材、以及覆蓋複數根主線光纖與緩衝材之光纜外浐 皮。於分支部上，亦可於藉由壓縮或切除緩衝材而形是 空間中收容光纖連接部。亦可於光纜外覆皮中埋 之 構件。 β張力 亦可於*支部t外側t分支光纜《前端*裝有光連接 130213.doc 200842421 器，該光連接器以可卸下之方式固定於主㈣。亦可將保 濩構件纏繞於主光纜以保護光連#器。車交佳的{，於分支 部中交叉地連接主光纜與分支光纜之光纖。 、刀 發明之效果200842421 IX. Description of the Invention: [Technical Field] The present invention relates to an optical cable in a main optical cable and provided with a branch optical cable for connecting a cable to a user. [Prior Art] The amount of information has increased due to the rapid spread of the Internet, and the rapid development of information communication has continued. Recently, a large-capacity and two-way optical network is being constructed, and FTTH (Fiber To The Home) service is being implemented. The φ FTTI service directly connects communication providers to families through optical fibers to provide High-speed communication service. Accordingly, there is an increasing demand for fiber optic cables in a main fiber optic cable that is provided with a single core or a plurality of branch fiber optic cables for connecting the fiber optic cable introduced into the user's home. An example of the optical cable is disclosed in Japanese Laid-Open Patent Publication No. Hei 7-128554. In the disclosed optical cable, a multi-core optical cable (main optical cable) and a low-hearted optical cable are combined with a tension member as a center, and the optical cable is bundled by a strap to realize integration. The length of the cable usually corresponds to the wiring span of 100 to 3 且 and at each connection point, a plurality of optical cables are connected via the junction box, thereby laying a plurality of light sights. In the junction box, the light of the heart is connected to the fiber of the main light mirror. However, in this cable, the cable of less care cannot be directly connected to the user to introduce the optical cable. Therefore, when connecting a cable with little heart and when a user introduces a fiber optic cable, it is necessary to take out the fiber core wire and connect the fiber. Therefore, branching operations take time. Further, it is necessary to mount the junction box for accommodating the light of the heart and the junction box of the optical fiber to the optical fiber cable, and therefore the installation space of the above-mentioned 1302I3.doc 200842421 junction box is required. SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION An object of the present invention is to provide an optical cable which is easy to perform branch work in the field and which does not require a junction box.技术 The technical means for solving the problem is to provide the above-mentioned (four) 'the present invention provides an optical cable, which alternately comprises: (1) a line portion composed of a main optical cable and a branch optical cable, wherein the main optical cable houses a plurality of main line domains, and the branch (four)-body And disposed in the main aperture and containing the -root or a plurality of branch fibers; and (7) the branching portion, the desired pair of main fiber fibers in the pair of branch fibers and the plurality of main line fibers: the connection. In (4) of the present invention, it is preferable that the branch portion is covered by the shield. The shield may be any one of a heat shrinkable tube, a half sleeve formed of a plastic resin, and an outer sheath of a cable cut by an autonomous optical cable. Preferably, outside the branch portion: the outer diameter of the disk body is substantially equal, and a guide portion for guiding the I-branch cable is provided on the shield. The smashing of the shovel - the main cable, in addition to a plurality of main-line fibers, also includes a buffer material, and a cable covering the plurality of main-line fibers and the buffer material. In the branch portion, the fiber connecting portion may be accommodated in a space by compressing or cutting the cushioning material. It can also be buried in the outer sheath of the cable. The β tension can also be used on the outer t-branch cable of the * branch t. The front end * is equipped with an optical connection 130213.doc 200842421, and the optical connector is detachably fixed to the main (four). The security member can also be wrapped around the main cable to protect the optical connector. The car is well-connected to the fiber of the main cable and the branch cable in the branch. Knife, the effect of invention
根據本發明’於光纜中預先設置有用戶5|入用之分支 部’因此無需於現場進行自光攪中引出分支光纜之作業， 故可大幅度縮短連接於用戶終端之引入光纜之連接作業時 間。又，根據本發明，有效利用主光纔内部之空間，無带 使用接線盒便可收容光纖連接部，因此可抑制分支部：： 型化，從而易於進行光纜鋪設作業。 【實施方式】 以下’ *照圖式’對本發明之實施形態加以說明。圖弋 之目的在於進行說明，而非限^發明之範圍。圖式中^ 避免重複說明，相同符辦矣；m . ' u付就表不冋一部分。圖式中之尺寸之 比率不一定準確。According to the present invention, the branch portion of the user 5|input is installed in the optical cable. Therefore, it is not necessary to carry out the operation of the branch cable from the optical stirring in the field, so that the connection operation time of the incoming optical cable connected to the user terminal can be greatly shortened. . Further, according to the present invention, the space inside the main light can be effectively utilized, and the optical fiber connecting portion can be accommodated without using the junction box. Therefore, the branch portion can be suppressed from being molded, and the optical cable laying operation can be easily performed. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The purpose of the illustration is to illustrate, not to limit the scope of the invention. In the figure, ^ avoid repeating the description, the same symbol does not do; m. 'u pays to be a part of the table. The ratio of dimensions in the schema is not necessarily accurate.
圖1係表示本發明之光纔 纜24交替地包含線條部23以 及 10d)。 之第一實施形態之側視圖。光 及分支部 10 (l〇a、10b、l〇c、 圖2係光纜24之線條部23之剖面圖。線條部23由 與分支光境6構成，該主光縵1收容有複數根光纖3，該^ 支光纜6 一體併設於主光纜!，且收容有一根或複數根 光:於主光^1中’複數根主線光纖3與緩衝材4同時 主光繞1之光·外覆皮2所覆蓋。於光料覆皮2中埋設有 張力構件5。於分支光纜6中，分支光纖7與張力構件$同時 130213.doc 200842421 由光纜外覆皮9所覆蓋。 *稷數根主線光纖3例如由帶式心線構成。當由6條4心之 T式心線重豐而構成複數根主線光纖3時，主光纜1之外徑 為11 mm左右。於分支光纜6為1心之情形時，該分支光纜6 為3.0 mmx 1.6 mm左右。光纜外覆皮2與光纜外覆皮9例如 係使用聚乙烯樹脂，經由較窄之連結部並藉由一體成形而 形成。緩衝材4例如係由聚丙烯形成之纖維材，將複數根 主線光纖3保持於域外覆皮2之中空内部，且保護其免受 驗夕卜力或弯曲等之影響。張力構件5例如係外徑為〇7麵左 右之鋼線’張力構件8例如係外徑為〇 4mm左右之鋼線。 再者，根據主光纜所要求之規格，亦可為如下之光纜， 即於光纟見外覆皮内並未填充緩衝材4而收容有複數根主 線光纖3。又，亦可不具有張力構件5。 圖3、®4分別絲示光纜24中之線條部之變形例之側視 圖與剖面圖。光纜24亦可為如下之光纜，#，藉由紫線22 I固定主光，與分支光續6而使該主光纜i與分支光動一 體化又亦可為如下之光纔，即，藉由紫線^來將複數 根分支光纜6a〜6c固定於主光纜！而實現一體化。 圖5係光纜24之分支部10之部分剖面圖。分支部⑺以特 定之間隔而與線條部23交替地設置。於分支部1〇處切除 主光窺1之光欖外覆皮2以及分支光境6之域外覆皮9。藉 由熔接連接等而使複數根主線光纖3中之所期望之光纖^ 與分支光纖7實現光纖連接。分支部1〇整體受到護罩^之 保護。於護罩12與光鏡外覆皮之接合面上纏繞有密封帶Μ 130213.doc 200842421 以確保防水性。 於藉由炼接而連接光纖3a與分支光纖7之情形時，光纖 =接部11¾到光纖保護套筒等保護構件之保護。於保護套 筒中’插入有玻璃陶瓷或鋼線作為強化材。光纖保護套管 之長度通常為20〜40 mm。安裝有強化材之光纖保護套筒 並無可撓性’因此’當欲輕微彎曲光纜時，該光纖無法自 由弓曲，有可能產生障礙（例如光纖斷線）。因此，較理想 的疋使用長度為20 mm左右之較短之保護套筒。 於主光纜1内填充有緩衝材4之情形時，可利用藉由壓縮 或切除緩衝材4而形成之空間來收容光纖連接部丨丨。藉 此了保遵光纖連接部11免受延伸作業時之壓縮或彎曲等 外力之影響。於該情形時，亦可省略光纖保護套筒内之強 化材。由於不安裝強化材，故而當彎曲光纜時，套筒會柔 軟地彎曲，從而不易產生障礙。又，較理想的是，藉由束 帶而將光纖連接部11固定於張力構件5或緩衝材4，使得該 光纖連接部11不會因光纜鋪設作業或鋪設後之微風振動而 於長度方向上移動。 埋入至光纜外覆皮2内之光纜2之張力構件5可直接使 用，而無須於分支部處切斷後使用。因此，即便於分支部 10處切除光纜外覆皮或緩衝材等内裝構件，亦無損於必要 之拉伸強度。 護罩12例如為熱縮管。熱縮管隨著内部纖芯之大小而收 縮，因此，可將分支部10之外徑增加量抑制為最小限度， 故可不影響光纜鋪設。又，若使用具有防水性之熱縮管， 130213.doc • 10· 200842421 則可省略密封帶13。例如’若使用雙層構造且於内層材質 中使用有祕融性聚稀烴樹脂之熱縮f，則樹脂因加熱而 文谷融，可確保與光纟覽外覆皮之密著性。 自複數根主線光纖3中纟出所期望之光纖3&，並將該光 纖3a安放至熔接連接機或機械連接工具中，藉此進行主光 纜1與分支光纜6之光纖連接作業。因此，較理想的是，使 刀支部10中之主光纜1内之光纖3_對於光纜具有鬆弛度 (餘長）’以可於分支部10處拉出光纖連接作業所必須之長 度之光纖。 圖6、圖7係表不光纜24之分支部之變形例之部分剖面 圖。當因光纖連接作業失敗多次等原因而導致餘長不足時 (圖6)延長連接光纖心線而補充長度。於該情形時，準備 光、、見之外之延長連接用之光纖丨4，光纖連接部11分為連接 點山、Ub此2個部位。又，當光纖連接作業中，餘長過 於多時（圖7)，於主光纜丨之圓周方向纏繞並收容餘長。 圖8係表示光纜24於分支部1〇處之主光纜與分支光纜之 心線連接形態之示例的概念圖。於圖8中，(A)部分表示通 常連接之示例，（B)部分、（c)部分分別表示交又連接之示 例。於進行交叉連接之情形時，若某部位無須使用分支光 纜，則例如於分支部10c進行下部送出連接（(c)部分），藉 此可將下游光纜用於其他用途。 圖9係表示本發明之光纜之第二實施形態之側視圖。圖 ^係表示包含第二實施形態之光叙用戶系統光配線之概 〜圖圖11係表不第二實施形態之光纜之較佳例之概念 130213.doc -11 - 200842421 圖。亦可於自分支部10(10a、l〇b、l〇c、l〇d)朝外側伸出 之分支光纜6之前端部，預先安裝光連接器15(圖9)。於該 情形時，利用連接器套筒20，無須接觸光纖即可進行分支 光纜6與引入光纜21之連接作業（圖1〇)。再者，於分支光窥 6中預先設置光連接器15之情形時，較好的是預先使纏繞 保護片16來覆蓋光連接器15(圖1丨）。如此，不僅可防水， 而且可防止進行延線作業時光連接器15掛到障礙物上、或 光連接器15損傷。Fig. 1 shows that the optical cable 24 of the present invention alternately includes the line portions 23 and 10d). A side view of the first embodiment. The light and branch portions 10 (10a, 10b, 10c, and 2 are cross-sectional views of the line portion 23 of the optical cable 24. The line portion 23 is composed of a branching light 6 that houses a plurality of optical fibers 3, the ^ cable 6 is integrated and installed in the main cable!, and contains one or a plurality of light: in the main light ^1 'multiple main line fiber 3 and the buffer material 4 at the same time the main light around 1 light · outer cover Covered by 2. The tension member 5 is embedded in the light-coated cover 2. In the branch cable 6, the branch fiber 7 and the tension member $ are simultaneously 130213.doc 200842421 covered by the cable cover 9. * A plurality of main-line fibers 3, for example, consisting of a belt-shaped core wire. When a plurality of four-core T-shaped core wires are formed to form a plurality of main-core fibers 3, the outer diameter of the main optical cable 1 is about 11 mm. In this case, the branch cable 6 is about 3.0 mm x 1.6 mm. The cable outer cover 2 and the cable outer cover 9 are formed, for example, of polyethylene resin, through a narrow joint portion and integrally formed. A fibrous material formed of polypropylene, which holds a plurality of main-line fibers 3 in a hollow interior of the outer covering 2 and protects The tension member 5 is, for example, a steel wire whose outer diameter is about 7 faces, and the tension member 8 is, for example, a steel wire having an outer diameter of about 4 mm. Further, according to the main optical cable The required specification may be an optical cable in which a plurality of main-line optical fibers 3 are accommodated without filling the cushioning material 4 in the outer cover, and the tension member 5 may not be provided. Fig. 3 and Fig. 4 respectively A side view and a cross-sectional view of a modification of the line portion in the cable 24. The cable 24 can also be an optical cable, #, which is fixed by the purple wire 22 I, and the branch light is 6 to make the main cable i Integration with the branching light can also be as follows: that is, the plurality of branching cables 6a to 6c are fixed to the main optical cable by the purple wire ^ to achieve integration. Fig. 5 is the branching portion 10 of the optical cable 24. A partial cross-sectional view of the branch portion (7) is alternately arranged with the line portion 23 at a specific interval. The outer cover 9 of the main gleam 1 and the outer cover 9 of the branch illuminator 6 are cut off at the branch portion 1 . The desired fiber and branch fiber 7 of the plurality of main-line fibers 3 are connected by fusion bonding or the like The optical fiber connection is realized. The branch portion 1 is protected by the shield. The sealing tape is wound around the joint surface of the shield 12 and the outer cover of the light mirror 130213.doc 200842421 to ensure waterproofness. When the optical fiber 3a and the branch optical fiber 7 are connected, the optical fiber = the protective portion of the connecting portion 113⁄4 to the optical fiber protective sleeve is protected. In the protective sleeve, a glass ceramic or steel wire is inserted as a reinforcing material. The length of the optical fiber protective sleeve It is usually 20 to 40 mm. The fiber protection sleeve with the reinforced material is not flexible. Therefore, when the cable is to be slightly bent, the fiber cannot be freely bowed, which may cause obstacles (such as fiber breakage). Therefore, it is preferable to use a shorter protective sleeve having a length of about 20 mm. When the main optical cable 1 is filled with the cushioning material 4, the space formed by compressing or cutting the cushioning material 4 can be used to accommodate the optical fiber connecting portion. Thereby, the optical fiber connecting portion 11 is protected from external forces such as compression or bending during the extending operation. In this case, the strong material in the fiber protection sleeve can also be omitted. Since the reinforcing material is not installed, when the optical cable is bent, the sleeve is softly bent, so that it is less likely to cause an obstacle. Further, it is preferable that the optical fiber connecting portion 11 is fixed to the tension member 5 or the cushioning material 4 by the band so that the optical fiber connecting portion 11 is not in the longitudinal direction due to the cable laying operation or the breeze vibration after the laying. mobile. The tension member 5 of the optical cable 2 embedded in the outer sheath 2 of the optical cable can be used as it is without being cut at the branch portion. Therefore, even if the inner peripheral member such as the outer sheath or the cushioning material of the optical cable is cut at the branch portion 10, the necessary tensile strength is not impaired. The shield 12 is, for example, a heat shrinkable tube. Since the heat-shrinkable tube shrinks with the size of the inner core, the increase in the outer diameter of the branch portion 10 can be minimized, so that the cable laying can be prevented. Further, if a heat-shrinkable tube having water repellency is used, the sealing tape 13 can be omitted. For example, if a double-layer structure is used and a heat shrinkage f of a secreted polyolefin resin is used for the inner layer material, the resin is heated by the Wengu, and the adhesion to the outer cover of the light can be ensured. The desired optical fiber 3& is taken out from the plurality of main-line optical fibers 3, and the optical fiber 3a is placed in a fusion splice machine or a mechanical connecting tool, whereby the optical fiber connection between the main optical cable 1 and the branch optical cable 6 is performed. Therefore, it is preferable to make the optical fiber 3_ in the main optical cable 1 in the blade portion 10 have slack (excess length) for the optical cable to pull out the optical fiber of the length necessary for the optical fiber connection work at the branch portion 10. Fig. 6 and Fig. 7 are partial cross-sectional views showing a modification of the branch portion of the optical cable 24. When the excess length is insufficient due to multiple failures in the fiber connection operation (Fig. 6), the length of the fiber core line is extended to replenish the length. In this case, the optical fiber bundle 4 for extending the connection is prepared, and the optical fiber connecting portion 11 is divided into two locations: the connection point mountain and the Ub. Further, when the optical fiber is connected, the excess length is excessive (Fig. 7), and the excess length is wound in the circumferential direction of the main optical cable. Fig. 8 is a conceptual diagram showing an example of a connection form of a core wire of a main cable and a branch cable at the branch portion 1 of the optical cable 24. In Fig. 8, part (A) shows an example of a normal connection, and parts (B) and (c) respectively show an example of a reconnection. In the case of cross-connection, if a branch cable is not required for a certain portion, for example, the branch portion 10c performs a lower-feed connection (part (c)), whereby the downstream optical cable can be used for other purposes. Fig. 9 is a side view showing a second embodiment of the optical cable of the present invention. Figure 4 is a diagram showing the optical wiring of the optical subscriber system of the second embodiment. Figure 11 is a diagram showing the concept of a preferred embodiment of the optical cable of the second embodiment. 130213.doc -11 - 200842421. The optical connector 15 (Fig. 9) may be preliminarily attached to the front end of the branch cable 6 which protrudes outward from the branch portion 10 (10a, l〇b, l〇c, l〇d). In this case, the connector sleeve 20 can be used to connect the branch cable 6 to the drop cable 21 without contacting the optical fiber (Fig. 1A). Further, in the case where the optical connector 15 is previously provided in the branch light gliding 6, it is preferable to wind the protective sheet 16 to cover the optical connector 15 in advance (Fig. 1A). In this way, not only waterproofing but also the optical connector 15 can be prevented from being caught on the obstacle or the optical connector 15 from being damaged during the extension operation.
圖12係表示本發明之光纜之分支部之第一變形例的圖， (A)部分係沿光纜之軸之部分剖面圖，（B)部分係垂直於光 纜之軸之剖面圖。於該變形例中，使用塑膠製之半套管 17a、17b作為護罩17。上下分割之半套管17a、17b分別於 與光纜外覆皮接合之接合面上設置有多數個小突起（銼狀 扣環）18，當將上述半套管安裝於光纜時，小突起18會咬 住光纜外覆皮2。藉此，例如即便於鋪設作業時施加外 力，半套筒17a、17b亦不相對於主光纜丨之光纜外覆皮2而 偏移側之套筒17b上設置有用以供分支光纔6穿 過之分支光纜穿過槽19。藉由未圖示之密封帶而使半套管 17a、17b與光纜外覆皮2、9之接合面防水。 圖 13係表示本發明之光纟覽之分支部 之第二變形例的侧視 圖。於第二變形例中 同。光纜外覆皮2中因光纖連接作 外覆皮2’），亦可再次用作護罩j 7 護罩17之形狀與光纜外覆皮2相 業而已切除之部分（光纜 。於護罩17與主光纜1之 邊界點纏繞有未圖示之密封帶 以確保防水性。又，於護 130213.doc 200842421 罩17上設置有用以導出分支光纜6 揸；6 , ★出邛（未圖示）。同樣 糟由狁封ν進行密封，以使該導出部防水。 產業上之可利用性 統之用戶系統光配線 本發明之光纜可較佳用作光通信系 中所使用之光繞。 【圖式簡單說明】Fig. 12 is a view showing a first modification of the branch portion of the optical cable of the present invention, wherein (A) is a partial cross-sectional view along the axis of the optical cable, and (B) is a cross-sectional view perpendicular to the axis of the optical cable. In this modification, half sleeves 17a, 17b made of plastic are used as the shield 17. The upper and lower divided half sleeves 17a, 17b are respectively provided with a plurality of small protrusions (ring-shaped buckles) 18 on the joint surface of the outer cover of the cable, and when the half sleeve is mounted on the optical cable, the small protrusions 18 Bite the outer cover of the cable 2. Thereby, for example, even if an external force is applied during the laying operation, the half sleeves 17a, 17b are not provided with respect to the outer cable cover 2 of the main cable, and the sleeve 17b on the offset side is provided for the branch light to pass through. The branch cable passes through the slot 19. The joint faces of the half sleeves 17a and 17b and the outer sheaths 2 and 9 of the cable are waterproofed by a sealing tape (not shown). Fig. 13 is a side elevational view showing a second modification of the branching portion of the light browsing of the present invention. In the second modification, the same. The outer cover 2 of the cable is made of the outer cover 2') due to the fiber connection. It can also be used again as the cover j 7 . The shape of the cover 17 and the part of the cable outer cover 2 which has been cut off (optical cable. A sealing tape (not shown) is wound around the boundary point of the main optical cable 1 to ensure waterproofness. Further, it is provided on the cover 130213.doc 200842421 to provide a branch cable 6 揸; 6 , ★ 邛 (not shown) The same reason is sealed by the seal ν to make the lead-out portion waterproof. The industrial system optical wiring of the present invention can be preferably used as the optical winding used in the optical communication system. Simple description
圖1係表示本發明之光繞之—實施形態之側視圖 圖2係第一實施形態之光纜之線條部之剖面圖。 圖3係表示第 側視圖。 一實施形態之光纜中之線條部之變形例的 圖4係表示第-實施形態之光麗中之線條部之變形例的 剖面圖。 圖5係第一實施形態之光纜之分支部之部分剖面圖。 圖6想第一實施形態之光纜之分支部之變形例的部分剖 面圖。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a light-wound embodiment of the present invention. Fig. 2 is a cross-sectional view showing a line portion of the optical cable of the first embodiment. Figure 3 shows the first side view. Fig. 4, which is a modification of the line portion in the optical cable of the embodiment, is a cross-sectional view showing a modification of the line portion in the brilliance of the first embodiment. Fig. 5 is a partial cross-sectional view showing a branch portion of the optical cable of the first embodiment. Fig. 6 is a partial cross-sectional view showing a modification of the branch portion of the optical cable of the first embodiment.
圖7係第一實施形態之光纜之分支部之變形例的部分剖 面圖。 圖8之（A)部分、（B)部分、以及（c)部分分別係表示本發 明之光纜之分支部處之心線連接形態的示例之概念圖。 圖9係表示本發明之光纜之第二實施形態之側視圖。 圖1〇係表示包含第二施形態之光纜之用戶系統光配線的 概念圖。 圖11係表不第二實施形態之光纜之較佳例之概念圖。 圖12係表示本發明之光纜之分支部之第一變形例的圖， 130213.doc -13- 200842421 (A)部分係沿光鏡之轴之& 神< σ卩分剖面圖，（B)部分係垂直於光 I龙之轴之剖面圖。 圖13係表示本發明之光纜之分支部之第二變形例的側視 圖。 【主要元件符號說明】Fig. 7 is a partial cross-sectional view showing a modification of the branch portion of the optical cable of the first embodiment. Parts (A), (B), and (c) of Fig. 8 are conceptual diagrams showing examples of the connection patterns of the core wires at the branch portions of the optical cable of the present invention, respectively. Fig. 9 is a side view showing a second embodiment of the optical cable of the present invention. Fig. 1 is a conceptual view showing a user system optical wiring including a second embodiment of the optical cable. Fig. 11 is a conceptual diagram showing a preferred example of the optical cable of the second embodiment. Figure 12 is a view showing a first modification of the branching portion of the optical cable of the present invention, 130213.doc -13 - 200842421 (A) is a section along the axis of the optical mirror & Part of the section is perpendicular to the axis of the light I dragon. Fig. 13 is a side elevational view showing a second modification of the branching portion of the optical cable of the present invention. [Main component symbol description]
1 主光纜 2, 2，，9 光纜外覆皮 3，3a 光纖 4 緩衝材 5, 8 張力構件 6，6a，6b，6c 分支光纜 7 分支光纖 10, 10a，10b，10c，lOd 分支部 11 光纖連接部 lla5 lib 連接點 12, 17 護罩 13 密封帶 14 延長連接用之光纖14 15 光連接器 16 保護片 17a，17b 半套管 18 小突起 19 分支光纜穿過槽 20 連接器套筒 130213.doc -14· 200842421 21 引入光纜 22 紮線 23 線條部 24 光纜 130213.doc -15-1 Main cable 2, 2,, 9 Cable outer sheath 3, 3a Fiber 4 Buffer material 5, 8 Tension member 6, 6a, 6b, 6c Branch cable 7 Branch fiber 10, 10a, 10b, 10c, lOd Branch 11 Fiber Connection part 11a5 lib connection point 12, 17 shield 13 sealing tape 14 fiber for extension connection 14 15 optical connector 16 protection sheet 17a, 17b half sleeve 18 small protrusion 19 branch cable through slot 20 connector sleeve 130213. Doc -14· 200842421 21 Introducing fiber optic cable 22 Cable 23 Line section 24 Cable 130213.doc -15-