1241421 玖、發明說明： 【發明所屬之技術領域】 本發明係有關於一種製造光纖透鏡之方法，特別是關於 一種製造雙曲線形式光纖透鏡之方法。 【先前技術】 在光纖透鏡的技術領域中上，為了增加雷射與光纖間的 轉光效率，各種不同型式的光纖透鏡不斷的被提出，分述 如下。 =利第卿號所揭示之光纖透鏡之製法係利用 ::放電溶燒，先將-光纖拉伸以製造出-錐形光纖，接 者在圓錐形光纖頭端作平端或球形對稱曲面處理，再料 =纖尖端浸人玻璃㈣中，控制該光纖浸人玻㈣深 ^形光纖的角度、錐形光纖頭端形狀、玻璃溶液溫度 伸㈣狀。其缺點為利用放㈣燒將光纖拉 利用玻璃炫池溫度來控制尖端透鏡形狀之製作過程繁 谩、耗時且難以控制。此外，此 主 ，、 之弁_、奏拉 1I成+圓球形 ’ ϋ圖1所不’難以形成與雷射光場完美匹配之 透鏡，無法有效提昇耦光效率。 美國專利第5,037，174號揭示一種運 製出錐形光纖之方法，其係利用=弧放電炫燒方式 纖拉伸速度使錐型光纖尖端燒溫度及光 ,^ 知大起，繼而以電弧放電熔焯太 二生對稱之雙曲線光纖透鏡。1缺Α1 70 之 /、缺點為该方法所製作出 式光纖尖端突起、之形狀難以且 定，難以大量生產。 襄長上不易穩 1241421 棘m利弟5,25M51號所揭示之方法係將光纖沿轴心旋 n腦計算控制脈衝式⑶2雷射研磨出—軸為圓形曲 :-軸為雙曲線之透鏡。此種方法之缺 製作非對稱曲面透鏡，相當不易，且 於制从々> ^ 匕〜田射成本昂貴，不 ㈣衣5產業運用上有極大的困難。 因此’貫有需要提供_創新且富進 光纖透鏡之方法，以解決上述問題。衣〜又曲線i 【發明内容】 本發明之主要目的係利用 ^ I 兩電弧與一經過氫氟酸蝕 d過後之錐形光纖之相對位 均勺、、w声利用兩電弧放電形成的不 勺勾皿度％，以得到雙曲線 京你植一， 、I九纖透鏡及所需之曲率 丰徑，提南光纖之耦光效率。 午 為達上述目的，本發明提出一 鏡之方法，包括以下牛驟 *“雙曲線型之光纖透 (b)清哜尖總· /、 除待加工光纖之外被覆層，· 冼先纖，（〇固定該待 提供一灾哭分严 先義於一光纖固定座；（d) ’、奋σσ ’依序將氩氟酸及機％ 4 弁输151〜十m ’由加入該容器中；（e)將該 先纖固疋座置於該容器上方 分之太☆山你x #尸 史5亥待加工光纖之裸光纖部 刀之末鳊伸入該氫氟酸層， 錐角 m刹ΗΑ + π 進仃蝕刻，於該末端形成一 角(f)利用兩電弧炫燒該 及（g)調整該兩電弧與該錐角 置y、㈣透鏡， 形成的不均勻溫度場1得到用兩讀電 需之曲率半徑。 Λ形式之光纖透鏡及所 【實施方式】 參考圖2，其顯示本發明之 ;IL長圖。首先於步驟S丨〇中， 1241421 將待加工光纖20之外被覆層剝除至所 一使該光纖分為兩部分，其—為包括外= 刀21，另一則為該裸光纖部分22 (詳如圖3所示）。 接者於步驟sii中，清洗該裸光纖部分22，於本實施例 中，係利用丙酮、酒精及去離子水清洗該裸光纖部分。 於步驟S12中，將該待加工光纖20固定於—光纖固定座％ 之陶究套管31内，如圖3所示，該光纖固定座3〇設有複數個 透孔，每一透孔内設置一陶£套管31以夹設_待加工光纖 0該陶瓷套官31之内徑係相同於該待加工光纖2〇之外徑。 於步驟S13中，提供一容器4〇及钮刻液’在本實施例中該 蝕刻液包括氫氟酸及機油，該容器4〇之材質係為可抗強酸 之鐵氟龍。其使用方法係依序將氫氟酸及機油加入該容器 中，以形成一氫氟酸層43、一中間混合層42及一機油層4二 於步驟S14中，將該光纖固定座3〇置於該容器4〇上方，使 該待加工光纖20之末端伸入該氫氟酸層43，以進行蝕刻， 於該末端形成一錐角。如圖4所示，姓刻的機制乃是由二氫 敦酸層43與機油層41間具有—中間混合層^，在該中間、曰 合⑽氫氟酸的濃度呈現一梯度變化，濃度隨著高度： 升高而降低，因此伸入該氫氟酸層43中之光纖可完全被溶 解’同時位於該中間混合層42中之光纖則會因氯氣酸的濃 度變化而被|虫刻出一個錐角2 3。 該氫氟酸層43的厚度對該錐角23並無任何的影響，而其 内之氫氟酸之漢度則是越濃敍刻所需時間越短，同時亦會 影響該中m層42之厚度，在本實施财，使用之氨^ 1241421 酉义之'辰度為45至55% ,較佳為48%。 /^油層4 1之浪度及厚度皆會影響中間混和層u的厚 X機油層4 1太濃或太厚會造成中間混 夠，所形成的錐角23會太A，且居度不 /月曰太大’且錐角長度太短；該機油層 或太薄會造成中間混和層42太厚，錐角長度太長。 在本實施例中’使用之機油層之厚度約為2咖?、 广卜段時間後（在本實施例中，姓刻時間為3〇〜45分 知)_’將光纖20取出後再進行一次清洗步驟，其與步驟川 相同’利用丙酮、酒精及去離子水清洗該光纖。 然後’進行炼燒之製程，於步驟S15中，如圖5所示，利 用=电弧51、52炫燒該錐角23，使其形成_光纖透鏡。 取後’於步驟S16中，調整該兩電弧51、52與該錐角2〇 ^相對位置’以得到所需之該光纖透鏡之雙曲線形式及曲 料徑。因為電弧放電所呈現出來的溫度場分佈形式為一 南斯分佈’因此該光纖置入此不均勾之溫度場會炫燒成雙 曲^式。而光纖透鏡的曲率半徑對於輕光效率有決定性 的影響’大曲率半徑的光纖透鏡在輕光上會造成較大的史 奈_反射、’使㈣效率下降’而小曲率半徑的光纖透鏡在 一 s &成較小的史奈爾反射，但是無法提供一適當的 光路將光福入光纖核心中’導致轉光效率下降，故設計製 造適當的曲率半徑是一重要因素。 、如圖6所示’其模擬結果得知該光纖透鏡之最佳曲率半徑 μ纟本步驟中’可藉由調整光纖之錐角23與兩電弧 中心之距離（即圖5中之χ方向）來得到所需之光纖透鏡之 1241421 曲率半徑。該距離越短，所得之曲率半徑越大，形狀也越 接近圓形；該距離越長，所得之曲率半徑越小，也較接近 雙曲線形式。在本實施例中，該距離約為I」馳，皇得到 該光纖透鏡之曲率半徑約為7〜9μηι，且頭端形狀為雙曲線 形式，如圖7所示。 上述貫施例僅為說明本發明之原理及其功效，並非限制 本發明。因此習於此技術之人士對上述實施例進行修改及1241421 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method for manufacturing a fiber optic lens, and more particularly to a method for manufacturing a hyperbolic fiber optic lens. [Prior Art] In the technical field of fiber optic lenses, in order to increase the conversion efficiency between laser and fiber, various types of fiber optic lenses have been continuously proposed, as described below. = The manufacturing method of the optical fiber lens disclosed by Li Diqing No. uses :: discharge melting, firstly -stretching the -optical fiber to produce a -tapered optical fiber, and then the flat end or spherical symmetrical curved surface treatment of the conical fiber head end, Refeeding = the fiber tip is immersed in the glass fiber, and the angle of the fiber immersed in the glass fiber is controlled, the shape of the tapered fiber head end, and the temperature of the glass solution. The disadvantages are that the optical fiber is pulled by using the sintering method and the temperature of the glass lens is used to control the shape of the tip lens. The manufacturing process is tedious, time-consuming and difficult to control. In addition, it is difficult to form a lens that perfectly matches the laser light field, which cannot effectively improve the light coupling efficiency. U.S. Patent No. 5,037,174 discloses a method for manufacturing a tapered optical fiber, which uses the fiber arc speed of the arc discharge firing method to make the tip of the tapered optical fiber burn the temperature and light. Fused Taijisheng symmetrical hyperbolic fiber lens. One of the shortcomings of A1 70 is that the shape of the tip of the optical fiber produced by this method is difficult to define and difficult to mass produce. The method disclosed in Xiangchang is not easy to stabilize. 1241421 The spine m Lidi 5,25M51 The method is to calculate and control the pulsed ⑶2 laser to grind the fiber along the axis of the brain. The axis is a circular curve: the axis is a hyperbolic lens . The shortcomings of this method It is quite difficult to make an asymmetric curved lens, and it is very expensive to manufacture the lens, and it is very difficult to use it in industrial applications. Therefore, there is always a need to provide innovative and enriched fiber lens methods to solve the above problems.衣 ～ 又 曲线 i [Summary of the invention] The main purpose of the present invention is to use ^ I two arcs and a tapered fiber after the hydrofluoric acid d after the relative position of the cone, w sound using two arc discharge In order to get the hyperbola, you can get a hyperbolic lens, a nine-fiber lens, and a required curvature radius, which can improve the coupling efficiency of the South fiber. In order to achieve the above-mentioned purpose, the present invention proposes a mirror method, which includes the following steps: "Hyperbolic fiber optic transmission (b) clearing tip" /, coating layer other than the optical fiber to be processed, (〇 Fixing this to provide a disaster-stricken point is strictly defined in a fiber-optic fixing base; (d) ', Fen σσ' Sequentially put argon fluoride acid and machine% 4 弁 151 ~ ten m 'by adding into the container; (e ) Place the pre-fiber holder on the top of the container ☆ Shanyou x # Corpse 5 The end of the knife of the bare fiber part of the fiber to be processed is extended into the hydrofluoric acid layer, and the taper angle m brake ΗΑ + π is etched, and an angle is formed at the end (f) The two arcs are used to burn the and (g) The two arcs and the cone angle are set to y and ㈣ lenses, and the uneven temperature field 1 is formed to obtain two power readings Curvature radius. Fiber optic lens in Λ form [Embodiment] Referring to FIG. 2, which shows a long diagram of the present invention. First, in step S 丨 〇, 1241421 strips the coating layer outside the optical fiber 20 to be processed to The first makes the fiber into two parts, which is-including the outer = knife 21, and the other is the bare fiber part 22 (see details) 3). In step sii, the bare optical fiber portion 22 is cleaned. In this embodiment, the bare optical fiber portion is cleaned with acetone, alcohol, and deionized water. In step S12, the optical fiber to be processed is cleaned. 20 is fixed in the ceramic sleeve 31 of the optical fiber fixing seat%, as shown in FIG. 3, the optical fiber fixing seat 30 is provided with a plurality of through holes, and each ceramic hole is provided with a ceramic sleeve 31 for clamping. _ The inner diameter of the ceramic sleeve member 31 of the optical fiber to be processed 0 is the same as the outer diameter of the optical fiber 20 to be processed. In step S13, a container 40 and a button etching solution are provided. In this embodiment, the etching solution includes Hydrofluoric acid and engine oil, the material of the container 40 is Teflon which can resist strong acid. Its use method is to sequentially add hydrofluoric acid and engine oil to the container to form a hydrofluoric acid layer 43 and an intermediate In step S14, the mixing layer 42 and an oil layer 42 are placed above the container 40, so that the end of the optical fiber 20 to be processed enters the hydrofluoric acid layer 43 for etching. A cone angle is formed at the end. As shown in Fig. 4, the mechanism of the last name engraving is the dihydrotonic acid layer 43 and the motor oil. There are 41-intermediate mixed layers ^, in which the concentration of hydrofluoric acid in the middle shows a gradient change, and the concentration decreases with height: so the optical fiber protruding into the hydrofluoric acid layer 43 can be completely The optical fiber that is dissolved and is located in the intermediate mixing layer 42 will be engraved with a cone angle 2 3 due to the change in the concentration of chloric acid. The thickness of the hydrofluoric acid layer 43 does not have any cone angle 23 The concentration of hydrofluoric acid in it is shorter and the shorter the time required for engraving, it will also affect the thickness of the middle m layer 42. In this implementation, the use of ammonia ^ 1241421 酉 义 之 ' The degree is 45 to 55%, preferably 48%. / ^ The thickness and thickness of the oil layer 41 will affect the thickness of the intermediate mixing layer u. The thick X machine oil layer 41 will be too thick or too thick, which will cause the intermediate mixing to be sufficient. The formed taper angle 23 will be too A, and the occupancy is not too large, and the taper angle length is too short; the oil layer or too thin will cause the intermediate mixing layer 42 to be too thick and the taper angle length will be too long. In this embodiment, 'the thickness of the used oil layer is about 2 coffee ?, after a wide period of time (in this embodiment, the last time is 30 ~ 45 minutes) _' Take out the optical fiber 20 before A cleaning step, which is the same as the step 'Clean the fiber with acetone, alcohol, and deionized water. Then, the sintering process is performed. In step S15, as shown in FIG. 5, the cone angle 23 is burned with = arcs 51 and 52 to form a fiber lens. After taking “in step S16, adjust the relative positions of the two arcs 51, 52 and the cone angle 20 ^” to obtain the hyperbolic form and the material diameter of the fiber lens required. Because the temperature field distribution form exhibited by the arc discharge is a Nansian distribution ', the temperature field of the optical fiber placed into the uneven discharge will burn into a hyperbolic ^ form. The curvature radius of the fiber lens has a decisive effect on the light efficiency. 'Fiber lenses with large curvature radius will cause larger Sinai reflections in light, which will reduce the efficiency of chirp.' & Smaller Schnell reflection, but unable to provide an appropriate optical path to bless the light into the core of the fiber, leads to a reduction in light conversion efficiency, so designing and manufacturing an appropriate curvature radius is an important factor. As shown in Figure 6, 'The simulation results show that the optimal radius of curvature of the fiber lens μ. In this step, you can adjust the distance between the cone angle 23 of the fiber and the center of the two arcs (ie, the χ direction in Figure 5). To get the required 1214221 radius of curvature of the fiber optic lens. The shorter the distance, the larger the radius of curvature obtained, and the closer the shape is to a circle; the longer the distance, the smaller the radius of curvature obtained, and the closer it is to a hyperbolic form. In this embodiment, the distance is about 1 inch, and the radius of curvature of the fiber lens is about 7 to 9 μm, and the shape of the head end is hyperbolic, as shown in FIG. 7. The above-mentioned embodiments are only for explaining the principle of the present invention and its effects, but not for limiting the present invention. Therefore, those skilled in the art modify the above-mentioned embodiments and
變化仍不脫本發明之精神。本發明之權利範圍應如後述之 申請專利範圍所列。 【圖式簡單說明】 圖1為傳統半球形式之光纖透鏡頭端圖； 圖2為本發明之流程圖； 圖3為本發明之蝕刻裝置之示意圖； 圖4為圖3之局部放大圖，其顯示本發明之蝕刻原理示意 圖； 圖5為本發明之熔燒裝置之示意圖；Changes still do not depart from the spirit of the invention. The scope of rights of the present invention should be as listed in the patent application scope mentioned later. [Brief Description of the Drawings] Figure 1 is a head-end view of a fiber optic lens in a traditional hemispherical form; Figure 2 is a flowchart of the present invention; Figure 3 is a schematic view of an etching device of the present invention; Figure 4 is a partially enlarged view of Figure 3; The schematic diagram of the etching principle of the present invention is shown; FIG. 5 is a schematic diagram of the melting device of the present invention;
圖6為光纖透鏡之曲率半徑對耦光效率之影響之模擬 圖；及 圖7為雙曲線形式之光纖透鏡頭端圖。 【圖式元件符號說明】 20 待加工光纖 21 包括彼附層部分 22 裸露部分 23 錐角 -10- 1241421 30 光纖固定座 31 陶瓷套管 40 容器 41 機油層 42 中間混合層 43 氫氟酸層 51、52 電弧Fig. 6 is a simulation diagram of the influence of the curvature radius of the fiber lens on the light coupling efficiency; and Fig. 7 is a head-end diagram of the fiber lens in the form of a hyperbola. [Illustration of Symbols of Schematic Elements] 20 Optical fiber to be processed 21 Including the attached layer part 22 Bare part 23 Cone angle -10- 1241421 30 Optical fiber holder 31 Ceramic sleeve 40 Container 41 Oil layer 42 Intermediate mixed layer 43 Hydrofluoric acid layer 51 52 arc
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