九、發明說明： 發明領域 本發明涉及背光源元件的導光板的製造方法，更詳細 地說，是涉及如下的背光源元件的導光板的製造方法，即， 最初通過直加工來製造模座(master block)之後，通過利用 該模座的電鍍複製來依次製造母模和子模，然後，通過利 用了子模的注射成型來大量生産導光板。 C先前技術3 發明背景 最近，一般作爲顯示裝置廣泛利用液晶顯示裝置 (LCD : Liquid Crystal Display)，但是液晶顯示裝置由於利 用作爲本身不能發光的受光元件的液晶，所以另外具備作 爲背面照明裝置的背光源元件(BLU : Back Light Unit)。 背光源元件根據所配備的光源的位置而劃分爲邊緣型 (edge type)和直射(direct type)型’直射型是指光源配置在液 晶顯示板的下部側，對顯示板的整個面進行直接照射的方 式；邊緣型是指光源配置在側部，從該光源發出的光通過 導光板並向前面側改變方向的方式，而本發明涉及邊緣型。 第1圖表示過去的邊緣型背光源元件的一例。 包括位於側部用於發出光的光源1〇、配置成端部與該 光源10相接觸的導光板30、層疊配置在導光板上的稜鏡 片40、層疊配置在稜鏡片4〇上的擴散片5〇等，並且，在導 光板30的下部側具有反射片2〇。 1344551 因此，從光源ίο射入導光板30的光，由作爲導光板30 的底面的反射面及導光板30下部側的反射片2〇進行反射， 從作爲導光板30的上表面的出射面射出，從導光板3〇射出 的光透射稜鏡片40並被聚光，接著透射擴散片5〇並被擴散 5 之後’最終照射液晶顯示板（無圖示）的整個面》 在上述這樣的背光源元件中，導光板3〇是決定其性能 的核心要件’具有改變如上述的光的路徑並且將從光源1〇 以點狀或線狀發出的光轉換成面光的作用。 這種導光板30由六面體狀的透明板體形成，其材質使 10用透光性良好的丙稀樹脂和聚碳酸酯樹脂等透明樹脂、或 玻璃等無機透明原材料、或者它們的複合體。 並且’導光板30沒有在其内部的介質變化，本身不能 改變光的路徑，所以，如第2圖所示，進一步在其底面上整 體地形成有用於對所入射的光進行反射的反射圖形（稜鏡 15圖形）32，作爲該反射圖形32主要採用稜鏡圖形。 這裏’反射圖形32的斷面形狀大致爲三角形，平行且 線狀地形成多個。 因此’從導光板30射入的光通過形成在導光板30的底 面上的反射圖形32的各傾斜面，按規定的角度反射而朝向 20上部側’或者，在透射了反射圖形32的各傾斜面之後，由 下部側的反射片2〇進行反射之後，再次通過導光板30而朝 向上部側。 在製造這樣的導光板3〇時，在該導光板3〇上，也可以 直接通過鐳射或機械加工等，進行直加工來製造反射圖形 6 32，但是’如果這樣通過直加工來分別製造導光板3〇，則 製造效率極大地下降，所以，最近主要通過注射成型來製 造導光板30，以同時形成反射圖形32。 也就是說，利用注射成型的導光板30的製造，預先準 備通過直加工而形成有反射圖形32的模芯後，通過利用該 模芯的注射成型的重復，更高效地製造導光板3〇。 然而’利用這種注射成型來製造的方法的情況下，也 産生以下的不良情況。 也就是說，利用一個模芯只能注射成型有限數量的導 光板30,所以，爲了大量生産導光板3〇，需要多個模芯。 但是’通過直加工來製造多個模芯，花費大量的時間、勞 力和成本，所以有製造效率料低、並且難以確保加工的 反射圖形32的精確性和重復性的問題。 再者，安裝在各種産品的背光源元件的導光板3〇，其 尺寸也必須分別不同’過Μ了製造多種尺寸的導光板 3〇，與其㈣地事先必鮮備各種尺寸的㈣，所以導致 製造效率進-步降低、反射圖形32的精雜和重復性也降 低的問題。 C ^^明内】 發明概要 因此，本發明鑒於上述情況，其目的是提供如下的背 光源凡件的導光板的製造方法，，最初通過直加工來製 k模座’通過利用該模座的二次電鍍複製來依次製造母模 和子模後’通過利用了子模的注射成型來大量生產導光 板，從而除了能提高製造效率以外，也能夠確保重復性和 質量。 爲了達到上述目的，本發明的背光源元件的導光板的 製造方法，其特徵在於，包括：通過直加工來製造形成有 5 反射圖形的模座的步驟；在上述模座的上述反射圖形上形 成電鍍膜的步驟；將上述電鍍膜從上述模座上剝離而得到 母模的步驟；在與上述母模上對應地形成的反射圖形上形 成第2電鍍膜的步驟；將上述第2電鍍膜從上述母模上剝離 而得到子模的步驟；以及在將上述子模安裝在模芯之後， 10 通過利用了上述模芯的注射成型，得到形成有與上述子模 上的反射圖形對應的反射圖形的導光板。 發明效果 若採用本發明，製造效率極低的直加工最少僅進行一 次，能夠順利地大量生産導光板，所以，具有當然提高生 15 産效率並可以製造優良品質的導光板的效果。 圖式簡單說明 第1圖是表示過去的背光源元件的結構的概要圖。 第2圖是表示過去的背光源元件所具備的導光板的概 要圖。 20 第3圖是表示根據本發明的背光源元件的導光板的製 造方法的順序圖。 第4圖是表示採用本發明通過直加工來製造模座的步 驟的概要圖。 第5圖是表示採用本發明來形成電鍍膜時使用的電解 8 電鑛裝置的概要圖。 第6圖是表示採用本發明得到在模座上進行電錢的母 模的少驟的概要圖。 第7圖是表示採用本發明來製造的母模的概要圖。 第8圖是表示採用本發明得到在母模上進行電鑛的子 模的少驟的概要圖。 第9圖是表示採用本發明來製造的子模的概要圖。 第10圖是說明按照本發明通過利用了子模的注射成型 來製造導光板的步驟的概要圖。 t賞施方式3 較佳實施例之詳細説明 以下參照附圖，詳細說明本發明的最佳實施方式。 第3圖是表示採用本發明的背光源元件的導光板的製 造方法的順序圖。 首先’如第4圖所示’在金屬板體上以陽刻直加工微細 的反射圖形102，製造模座l〇〇(Sl〇2)。 這時，作爲一例，利用金剛石刀具104通過切削加工來 可以形成反射圖形1〇2 ° 然後’利用第5圖所示的電解電鍍裝置200在模座1〇〇 的形成有該反射圈形的上表面上再形成電錄膜 300(S104)。 這時’將作爲被覆物件的模座100與陰極202連接，在 與陽極204—起浸入電解電鍍液206中的狀態下，在陽極2〇4 和陰極202之間流過電流，在模座1〇〇的反射圖形1〇2上覆蓋 1344551 形成電鍍膜300 ’但是，電鍍膜300最好能用鎳(Ni)金屬膜來 形成。 接著，如第6圖所示，當將形成在模座1〇〇上的電鍍膜 300剝離分離時，在該電鍍膜3〇〇上複製形成與模座1〇〇上的 5陽刻反射圖形302相反地對應的陰刻反射圖形302(S106)。 並且，把這樣製造的電鍍膜300稱爲母模3〇〇(參見第7 圖）。 然後’利用上述電解電鍍裝置200再次複製該母模 300，也就是說，在母模3〇〇的陰刻反射圖形3〇2上通過電解 10電鍍來形成第2電鍍膜400之後(S108)，如第8圖所示，當將 該第2電鍍膜400從母模300上剝離而分離時，在得到的第2 電鍍膜400上複製形成與母模300上的陰刻反射圖形3〇2相 反地對應的陽刻反射圖形402(S110)，將這樣製造的第2電鍍 膜400稱爲子模1〇〇(參見第9圖）。 15 這裏，重復進行利用了母模300的、通過電鍍的子模4〇〇 的製造，製造多個子模400。 然後’如第10圖所示’將製造出的一個子模4〇〇安裝在 模芯500上後，通過利用該模芯5〇〇的注射成型的重復，製 造多個導光板30(S114)，這樣製造的導光板30上的反射圖形 2〇 32與子模400上的陽刻反射圖形402相反對應地形成爲陰 刻。 這樣’报費時間的直加工最初僅進行一次來製造出模 座100之後，利用該模座100來製造母模300和多個子模 4〇〇，利用該子模400可以大量生産導光板30，所以，能夠 10 實現大幅度提高製造效率，並且，能製造重復性和質量良 好的導光板30。 再者，若採用本發明，利用母模300來製造出多個子模 400之後，將該子模400切斷爲期望的尺寸（S112)，可以利用 5 已切斷的特定的子模400來製造相應尺寸的導光板30，因 此，首先需要將模座100製造成最大的尺寸。 當然，也可以不將子模400切斷成多種尺寸，代之將母 模300切斷成多種尺寸，可以製造相應的多種尺寸的導光板 30 ° 10 這樣，也很容易製造多種尺寸的導光板30，所以在這 一點上也可以提高製造效率。 最後，在以上最初使模座100上的反射圖形102形成爲 陽刻，最終使製造的導光板30上的反射圖形32形成爲陰 刻，但是，也可以與其相反地實施是不言而喻的。 15 以上内容只不過是例示了本發明的最佳實施方式，本 發明可以在權利要求書所公開的本發明的範圍内進行各種 變更及修改。 I：阖式簡單說明3 第1圖是表示過去的背光源元件的結構的概要圖。 20 第2圖是表示過去的背光源元件所具備的導光板的概 要圖。 第3圖是表示根據本發明的背光源元件的導光板的製 造方法的順序圖。 第4圖是表示採用本發明通過直加工來製造模座的步 11 1344551 驟的概要圖。 第5圖是表示採用本發明來形成電鍍膜時使用的電解 電鍍裝置的概要圖。 第6圖是表示採用本發明得到在模座上進行電鍍的母 5 模的步驟的概要圖。 第7圖是表示採用本發明來製造的母模的概要圖。 第8圖是表示採用本發明得到在母模上進行電鍍的子 模的步驟的概要圖。 第9圖是表示採用本發明來製造的子模的概要圖。 10 第10圖是說明按照本發明通過利用了子模的注射成型 來製造導光板的步驟的概要圖。 【主要元件符號說明】 10…光源 2〇〇…電解電鍍裝置 20…反射片 202…陰極 30…導光板 204…陽極 32…反射圖形 206…電解電鍵液 40…棱鏡片 300…電鍍膜 50…擴散片 302…陽刻反射圖形 100…製造模座 400…第2電鑛膜 102…反射圖形 402…陽刻反射圖形 104…金剛石刀具 500…模芯 12BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a light guide plate of a backlight element, and more particularly to a method of manufacturing a light guide plate of a backlight element, that is, a mold base is initially manufactured by direct processing ( After the master block), the master and the sub-mold are sequentially manufactured by electroplating reproduction using the mold base, and then the light guide plate is mass-produced by injection molding using the sub-mold. C. Prior Art 3. In recent years, a liquid crystal display device (LCD) is widely used as a display device. However, since a liquid crystal display device uses a liquid crystal which is a light-receiving element that cannot emit light by itself, it also has a backlight as a backlight device. Source Element (BLU: Back Light Unit). The backlight element is divided into an edge type and a direct type according to the position of the light source to be equipped. The direct type means that the light source is disposed on the lower side of the liquid crystal display panel, and directly irradiates the entire surface of the display panel. The edge type refers to a manner in which the light source is disposed at the side, the light emitted from the light source passes through the light guide plate and changes direction toward the front side, and the present invention relates to the edge type. Fig. 1 shows an example of a conventional edge type backlight element. a light source 1B for emitting light at a side portion, a light guide plate 30 disposed at an end portion in contact with the light source 10, a cymbal sheet 40 stacked on the light guide plate, and a diffusion sheet laminated on the cymbal sheet 4 5〇 and the like, and a reflection sheet 2〇 is provided on the lower side of the light guide plate 30. 1344551 Therefore, the light incident on the light guide plate 30 from the light source 355 is reflected by the reflection surface of the bottom surface of the light guide plate 30 and the reflection sheet 2〇 on the lower side of the light guide plate 30, and is emitted from the emission surface which is the upper surface of the light guide plate 30. The light emitted from the light guide plate 3 is transmitted through the cymbal 40 and condensed, and then transmitted through the diffusion sheet 5 〇 and diffused 5, and then 'finally illuminates the entire surface of the liquid crystal display panel (not shown). Among the elements, the light guide plate 3 is a core element that determines its performance 'having a function of changing the path of the light as described above and converting the light emitted from the light source 1 点 in a dot shape or a line shape into a surface light. The light guide plate 30 is formed of a hexahedral transparent plate, and is made of a transparent resin such as acryl resin or polycarbonate resin having good light transmittance, or an inorganic transparent material such as glass, or a composite thereof. . Further, the light guide plate 30 does not have a medium change therein, and the path of the light itself cannot be changed. Therefore, as shown in Fig. 2, a reflection pattern for reflecting the incident light is further integrally formed on the bottom surface thereof ( As the reflection pattern 32, a 稜鏡 pattern is mainly used. Here, the cross-sectional shape of the reflection pattern 32 is substantially triangular, and a plurality of them are formed in parallel and in a line shape. Therefore, the light incident from the light guide plate 30 passes through the inclined surfaces of the reflection pattern 32 formed on the bottom surface of the light guide plate 30, and is reflected at a predetermined angle toward the upper side of the 20' or the inclination of the reflection pattern 32 is transmitted. After the surface, the reflection sheet 2 is reflected by the lower side, and then passes through the light guide plate 30 again toward the upper side. When such a light guide plate 3 is manufactured, the light guide plate 3 may be directly processed by laser or machining to produce the reflection pattern 6 32, but 'if such a light guide plate is separately manufactured by straight processing. 3〇, the manufacturing efficiency is greatly lowered, and therefore, the light guide plate 30 has been mainly manufactured by injection molding to simultaneously form the reflection pattern 32. In other words, in the production of the light guide plate 30 by injection molding, a core having the reflection pattern 32 formed by straight machining is prepared in advance, and the light guide plate 3 is more efficiently manufactured by repeating the injection molding using the core. However, in the case of the method of manufacturing by such injection molding, the following problems occur. That is to say, only a limited number of light guide plates 30 can be injection molded using one core, so that a large number of cores are required for mass production of the light guide plate. However, manufacturing a plurality of cores by straight processing takes a lot of time, labor, and cost, so that there is a problem that the manufacturing efficiency is low, and it is difficult to ensure the accuracy and repeatability of the processed reflection pattern 32. Furthermore, the light guide plates 3 安装 mounted on the backlight elements of various products must be different in size. 'The light guide plates 3 制造 are manufactured over a plurality of sizes, and (4) must be prepared in various sizes (four) in advance, thus resulting in The manufacturing efficiency is further reduced, and the fineness and repeatability of the reflection pattern 32 are also lowered. SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a method of manufacturing a light guide plate of a backlight unit, which is initially manufactured by straight processing to form a k-die base 'by utilizing the mold base After the secondary plating is replicated to sequentially manufacture the master and the sub-mold, the light guide plate is mass-produced by injection molding using the sub-mold, so that in addition to improving the manufacturing efficiency, the repeatability and quality can be ensured. In order to achieve the above object, a method of manufacturing a light guide plate of a backlight element of the present invention includes the steps of: manufacturing a die holder formed with a reflective pattern by straight processing; forming on the reflective pattern of the mold base a step of plating a film; a step of peeling the plating film from the mold base to obtain a master mold; a step of forming a second plating film on a reflective pattern formed corresponding to the master mold; and the second plating film a step of peeling off the master mold to obtain a sub-mold; and after mounting the sub-mold to the mold core, 10 by using injection molding using the mold core, a reflection pattern formed corresponding to the reflection pattern on the sub-mold is obtained Light guide plate. According to the present invention, since the direct processing with extremely low manufacturing efficiency is performed at least once, and the light guide plate can be mass-produced smoothly, it is possible to produce a light guide plate of excellent quality, of course. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the configuration of a conventional backlight element. Fig. 2 is a schematic view showing a light guide plate provided in a conventional backlight element. Fig. 3 is a sequence diagram showing a method of manufacturing a light guide plate of a backlight unit according to the present invention. Fig. 4 is a schematic view showing a step of manufacturing a mold base by straight machining using the present invention. Fig. 5 is a schematic view showing an electrolysis 8 electrowinning apparatus used in the formation of a plating film by the present invention. Fig. 6 is a schematic view showing a small number of steps for obtaining a mother die for carrying money on a die holder by the present invention. Fig. 7 is a schematic view showing a master mold manufactured by the present invention. Fig. 8 is a schematic view showing a small number of sub-modes for obtaining electric ore in the mother mold by the present invention. Fig. 9 is a schematic view showing a sub-mold manufactured by the present invention. Fig. 10 is a schematic view showing the steps of manufacturing a light guide plate by injection molding using a sub-mold according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 3 is a sequence diagram showing a method of manufacturing a light guide plate using the backlight element of the present invention. First, as shown in Fig. 4, a fine reflection pattern 102 is directly processed on the metal plate body to form a mold base 10 (S10). In this case, as an example, the diamond pattern cutter 104 can be used to form the reflection pattern 1 〇 2 ° by the cutting process, and then the upper surface of the mold base 1 形成 is formed by the electrolytic plating apparatus 200 shown in FIG. The electrophotographic film 300 is further formed (S104). At this time, the die holder 100 as the covering member is connected to the cathode 202, and in a state of being immersed in the electrolytic plating solution 206 with the anode 204, a current flows between the anode 2〇4 and the cathode 202, at the die holder 1〇. The reflective pattern 1〇2 of the crucible covers the 1344551 to form the plating film 300'. However, the plating film 300 is preferably formed of a nickel (Ni) metal film. Next, as shown in FIG. 6, when the plating film 300 formed on the mold base 1 is peeled off and separated, a 5 positive reflection pattern 302 on the plating film 3 is formed and formed on the mold base 1 Conversely, the corresponding intaglio reflection pattern 302 is obtained (S106). Further, the plating film 300 thus manufactured is referred to as a master mold 3 (see Fig. 7). Then, the master mold 300 is again copied by the electrolytic plating apparatus 200 described above, that is, after the second plating film 400 is formed by electrolytic 10 plating on the negative reflection pattern 3〇2 of the master mold 3 (S108), As shown in Fig. 8, when the second plating film 400 is peeled off from the master mold 300 and separated, the second plating film 400 is formed on the second plating film 400 to be oppositely formed to correspond to the negative reflection pattern 3〇2 on the master mold 300. The second etching film 402 (S110) is referred to as a sub-module 1 (see Fig. 9). Here, the manufacture of the sub-dies 4 by electroplating using the master 300 is repeated to manufacture a plurality of sub-modules 400. Then, as shown in FIG. 10, after mounting one of the manufactured sub-dies 4 on the mold core 500, a plurality of light guide plates 30 are manufactured by repeating injection molding using the mold core 5 (S114). The reflection pattern 2〇32 on the light guide plate 30 thus manufactured is oppositely formed to be inscribed in the opposite direction to the positive reflection pattern 402 on the submodule 400. Thus, the straight processing of the 'paid time' is initially performed only once to manufacture the mold base 100, and the mold base 100 is used to manufacture the master mold 300 and the plurality of sub-modules 4, by which the light guide plate 30 can be mass-produced. Therefore, the manufacturing efficiency can be greatly improved by 10, and the light guide plate 30 with good repeatability and good quality can be manufactured. Further, according to the present invention, after the plurality of sub-modules 400 are manufactured by the master mold 300, the sub-die 400 is cut into a desired size (S112), and it can be manufactured by using the specific sub-module 400 that has been cut. The light guide plate 30 of a corresponding size, therefore, first requires the mold base 100 to be manufactured to the largest size. Of course, the sub-mold 400 may not be cut into a plurality of sizes, and the master mold 300 may be cut into a plurality of sizes, and the corresponding light guide plates of various sizes may be manufactured 30°. Thus, it is easy to manufacture a plurality of sizes of light guide plates. 30, so at this point can also improve manufacturing efficiency. Finally, in the above, the reflection pattern 102 on the mold base 100 is initially formed into a positive shape, and finally the reflection pattern 32 on the manufactured light guide plate 30 is formed into an intaglio, but it is self-evident that it can be implemented in the opposite direction. The above is only a preferred embodiment of the invention, and various modifications and changes can be made within the scope of the invention as disclosed in the appended claims. I: Brief description of the simplification 3 Fig. 1 is a schematic view showing the structure of a conventional backlight element. 20 Fig. 2 is a schematic view showing a light guide plate provided in a conventional backlight element. Fig. 3 is a sequence diagram showing a method of manufacturing a light guide plate of a backlight element according to the present invention. Fig. 4 is a schematic view showing a step 11 1344551 in which a mold base is manufactured by straight machining using the present invention. Fig. 5 is a schematic view showing an electrolytic plating apparatus used for forming a plating film by the present invention. Fig. 6 is a schematic view showing the steps of obtaining a mother mold which is plated on a mold base by the present invention. Fig. 7 is a schematic view showing a master mold manufactured by the present invention. Figure 8 is a schematic view showing the steps of obtaining a sub-die for electroplating on a master by the present invention. Fig. 9 is a schematic view showing a sub-mold manufactured by the present invention. 10 Fig. 10 is a schematic view showing a step of manufacturing a light guide plate by injection molding using a sub-mold according to the present invention. [Description of main components] 10...light source 2〇〇...electrolytic plating apparatus 20...reflector 202...cathode 30...light guide 204...anode 32...reflection pattern 206...electrolytic key solution 40...prism sheet 300...plating film 50...diffusion Sheet 302...positive reflection pattern 100...manufacture of mold base 400...second electric ore film 102...reflection pattern 402...positive reflection pattern 104...diamond cutter 500...core 12