201235693 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種製造導光板之方法。 【先前技術】 液晶顯示裝置等透過型圖像顯示裝置一般而言具有作為 ’ 背光源之面光源裝置。端面照光型面光源裝置係包括具有 w 透光性樹脂板之導光板、以及對透光性樹脂板之端面供給 光之光源。自透光性樹脂板之端面入射之光係藉由設置於 Ο 透光性樹脂板之背面側之反射點等反射機構而反射，自導 光板之出射面供給圖像顯示用之面狀光。 用於製造導光板之透明樹脂母板，存在於黏貼有用以保 護該透明樹脂母板之表面之保護膜之狀態下進行供給之情 況（例如，參照專利文獻丨。）。作為保護膜，考慮到製造成 本等觀點而廣泛使用具有包含聚乙烯系彈性體之黏著層 者。 作為於透光性樹脂板上形成反射點之方法，提出有應用 〇 喷墨印刷法。根據喷墨法，期待可簡易地形成構成所需圖 案之反射點。 ^ 先前技術文獻 • 專利文獻 專利文獻1:日本專利特開2005_131783號公報 【發明内容】 發明所欲解決之問題 然而，若藉由噴墨法來形成反射點，則存在以下問題： 161717.doc 201235693 有時反射點之形狀紊，或相鄰之反射點彼此間連結，從 而無法以符合設計之圖案形成反射點。若產生反射^之圖 案之紊亂，則作為導光板之功能可能明顯受損。 因此，本發明之目的在於當藉由喷墨法來形成導光板之 反射點時充分地抑制反射點圖案之紊亂。 解決問題之技術手段 根據本發明者等人之見解，認為在將具有黏著層之保護 膜自樹脂板剝離掉時，形成黏著層之黏著劑之一部分會殘 留於樹脂板之表面，且因殘留之黏著劑導致反射點之圖案 紊亂。尤其於藉由噴墨法來形成反射點之情形時，容易產 生黏著劑導致圖案之紊亂。本發明者等人經過銳意研究， 結果發現可藉由使用具有包含特定成分之黏著層之保護 膜，而抑制反射點之圖案之紊亂，從而完成本發日2。… 即，本發明之製造導光板之方法包括如下步驟：將保護 膜自樹脂板剝離，該保護臈係包含基材膜、及設置於該基 材膜上且黏貼於樹脂板之表面之黏著層，且該黏著層含有 乙烯-乙酸乙烯醋共聚物；藉由噴墨印刷而將油墨配置於 樹脂板之黏貼有黏著層之表面，形成點狀圖案；以及自形 成上述圖案之上述油墨’形成反射點。 又，本發明係關於一種可藉由上述本發明之製造方法而 獲得之導光板。本發明之導光板可—方面充分地抑制反射 點之圖案之紊亂，一方面充分地發揮噴墨法之優點，簡易 且高效地進行製造。 墨印刷用樹脂板 於其他形態中，本發明係關於一種噴 161717.doc 201235693 S亥喷墨印刷用樹脂板可藉由包括如下步驟之方法而獲得： 將保護膜自樹脂板剝離，該保護膜係包含基材膜、及設置 於4基材膜上且黏貼於樹脂板之表面之黏著層，且該黏著 層含有乙烯-乙酸乙烯酯共聚物。 根據本發明之樹脂板，於將油墨點狀地圖案印刷於該樹 脂板之表面上時，可充分地抑制印刷圖案之紊亂。本發明 v 之樹脂板可較佳地用於製造導光板。 發明之效果 〇 根據本發明，可於藉由喷墨法來形成導光板之反射點之 情形時’充分地抑制反射點圖案之紊亂。 【實施方式】 以下，對本發明之較佳實施形態進行詳細說明。其中， 本發明並不限定於以下實施形態。 圖1係表不製造導光板之方法之一實施形態的步驟圖。 本實施形態之方法係主要包括如下步驟：將保護膜2自樹 Q 脂板15剝離，該保護膜2係包含基材膜25 '及設置於基材 膜25上且黏貼於樹脂板15之表面之黏著層21 ;藉由喷墨印 .刷而將油墨10配置於樹脂板15之黏貼有黏著層之表面s， 形成點狀圖案；以及自形成有圖案之油墨1〇，形成反射點 11。根據該方法，可製造包含樹脂板15及設置於樹脂板15 上之反射點11的導光板1。 如圖1 (a)所不，樹脂板丨5係於其表面上黏貼有保護膜2之 狀態下進打供給。保護膜2之黏著層21含有作為彈性體之 乙烯-乙酸乙烯酯共聚物。該乙烯-乙酸乙烯酯共聚物較佳 161717.doc 201235693 為含有源自乙酸乙烯酯之8〜20質量％之單體單元、及' 乙烯之80〜92質量％之單體單元。黏著層以亦可含有乙#稀^ 乙酸乙稀醋共聚物以外之其他成分。較佳為，黏著層Μ 有使對於選自松脂系樹脂、苯并咬喃，樹脂、苯并咬： 樹脂及節樹脂之被著體(樹脂板! 5 )之潤濕性提昇之材料。 松脂系樹脂係選自例如松脂、聚合松脂 '氣化松脂、松月旨 改性物及松脂或氫化松脂之甘油酯或季戊四醇酯。其中: 較佳為氫化松脂。 ' 基材膜25較佳為聚烯烴系樹脂膜。聚烯烴系樹脂膜至少 包含1種選自例如低密度聚乙烤、中密度聚乙煉、高密^ 聚乙烯、直鏈狀低密度聚烯烴、聚丙烯及乙烯-丙烯共； 物之聚烯烴系樹脂。基材膜25可為單層膜，亦可為包含2 層以上之膜之多層臈。 3 樹月旨板15係、透光性之樹脂片。具體而言，㈣板15較佳 為聚（甲基）丙稀酸烧基醋樹脂片、聚苯乙烯片或聚碳酸酉旨 系樹脂片。 將保護膜2自樹脂板15剝離，使樹脂板15之一主表面即 表面s露出（圖1(b)p剝離保護膜2之方法未作特別限定。 具有表面S之樹脂板15係用於藉由噴墨法而利用油墨對表 面S進行印刷，形成印刷圖案。即，樹腊_係噴墨印刷 用樹脂板。 繼而，如® 1(C)所示，於黏貼有黏著層之表面s配置 反射點形成用之油墨1〇,形成點狀圖案。油墨_ 黑 頭5以液滴狀噴出。 、^ 161717.doc 201235693 油墨ίο為藉由硬化或乾燥而形成反射點之油墨即可，例 士可使用i外線硬化油墨、水性油墨或溶劑油墨。該等 油墨中’就環保之便利性等觀點而言，較佳為紫外線硬化 油墨及水性油墨。於使用紫外線硬化油墨之情形時，經由 利用燈7對經印刷之油墨丨〇照射紫外線，使油墨1 〇硬化之 步驟，形成包含經硬化之油墨之反射點丨丨。於使用水性油 墨或溶劑油墨之情形時，藉由乾燥裝置而將油墨乾燥，形 成反射點。任一種類之油墨均可含有顏料等之微粒子，亦 可為視需要不含微粒子之透明者。 可藉由使用黏著層21含有乙烯_乙酸乙烯酯共聚物之保 護膜2,而抑制自印刷直至硬化為止之過程中反射點μ 形狀之局部奈亂。例如，不易產生山型反射點"之底邊部 擴散，導致相鄰之反射點η彼此間連結之情形。 導光板1係較佳地用作例如構成液晶顯示裝置之端面照 光型面光源裝置用之導光板。 實施例 以下’例㈣施你卜對本發明進一步進行具體說明。但 是’本發明並不限定於該等實施例。 導光板之製作 準備於表面黏貼有具有包含乙烯-乙酸乙烯酯共聚物之 黏著層之保護膜（T〇ray FiIm加工製造，T〇retec7232)的聚 甲基丙烯酸甲酯樹脂片（厚度4 mm、尺寸370 mm)。將保護臈自該丙烯酸樹脂片（聚甲基丙烯酸甲酯樹脂 片）剝離，並藉由使用紫外線硬化油墨（4〇〇c時之黏度· 8 3 161717.doc ， 201235693 mPa · s)之噴墨法，以解析度3〇〇 dpi、解析度以❹扣丨或解 析度75 dpi對因制離而露出之丙烯酸樹脂片之表面進行印 刷。將油墨之液滴量設定為約4〇 pL，喷墨頭之掃描速度 設定為200 mm/s。自油墨著落2秒之後，藉由累計光量〇·5 J/m2之紫外線照射而使油墨硬化，形成反射點，獲得實施 例之導光板。 除了將保護膜替換為具有包含聚乙烯之黏著層之膜（日 立化成工業製造，Hitalex ML223G)以外，以與實施例相同 之順序’獲得比較例之導光板。 評價 以目視觀察導光板之反射點之狀態，並#由以下基準來 判定其狀態。評價結果示於表1。 A :相鄰之反射點彼此間未連結，且形出 战有具有大致圓形 之底面之反射點。 B :相鄰之反射點彼此間連結，及/或形屮丄 〜戍有具有自圓形紊 亂之形狀之底面的反射點。 [表1] 實施例 ~— 黏著層 ---- 乙烯-乙酸乙烯酯共聚物一- 反射點觀察結果 解析度300 dpi ^ A 解析度150 dpi ............· A … 解析度75 dpi -------.... A … 比較例 聚乙烯201235693 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method of manufacturing a light guide plate. [Prior Art] A transmissive image display device such as a liquid crystal display device generally has a surface light source device as a backlight. The end-illuminated surface light source device includes a light guide plate having a w-transparent resin plate and a light source for supplying light to an end surface of the translucent resin plate. The light incident from the end surface of the light-transmitting resin sheet is reflected by a reflection means such as a reflection point provided on the back side of the 透光 light-transmitting resin sheet, and the surface light for image display is supplied from the light-emitting surface of the light guide plate. The transparent resin mother substrate for producing a light guide plate is supplied in a state in which a protective film for protecting the surface of the transparent resin mother substrate is adhered (for example, see Patent Document 丨). As the protective film, an adhesive layer containing a polyethylene-based elastomer is widely used in view of production cost and the like. As a method of forming a reflection point on a light-transmitting resin sheet, an application 〇 inkjet printing method has been proposed. According to the ink jet method, it is expected that the reflection points constituting the desired pattern can be easily formed. CITATION LIST Patent Literature Patent Literature 1: JP-A-2005-131783 SUMMARY OF INVENTION Technical Problem However, if a reflection point is formed by an inkjet method, the following problems occur: 161717.doc 201235693 Sometimes the shape of the reflection point is turbulent, or adjacent reflection points are connected to each other, so that the reflection point cannot be formed in a pattern conforming to the design. If the disorder of the reflection pattern is generated, the function as a light guide plate may be significantly impaired. Accordingly, an object of the present invention is to sufficiently suppress the disorder of the reflection dot pattern when the reflection point of the light guide plate is formed by the ink jet method. According to the inventors' knowledge, it is considered that when the protective film having an adhesive layer is peeled off from the resin sheet, a part of the adhesive forming the adhesive layer remains on the surface of the resin sheet, and remains due to the residue. The adhesive causes the pattern of the reflection points to be disordered. Particularly in the case where a reflection point is formed by an ink jet method, it is easy to cause an adhesive to cause disorder of the pattern. As a result of intensive research, the inventors of the present invention have found that the pattern of the reflection point can be suppressed by using a protective film having an adhesive layer containing a specific component, thereby completing the present day. That is, the method for manufacturing a light guide plate of the present invention comprises the steps of: peeling a protective film from a resin sheet, the protective layer comprising a substrate film, and an adhesive layer disposed on the substrate film and adhered to a surface of the resin sheet And the adhesive layer comprises an ethylene-vinyl acetate copolymer; the ink is disposed on the surface of the resin sheet adhered to the adhesive layer by inkjet printing to form a dot pattern; and the ink is formed from the pattern forming the reflection point. Further, the present invention relates to a light guide plate obtainable by the above-described manufacturing method of the present invention. The light guide plate of the present invention can sufficiently suppress the disorder of the pattern of the reflection dots, and at the same time, fully exhibits the advantages of the ink jet method, and can be easily and efficiently manufactured. In other forms, the present invention relates to a resin sheet for inkjet printing of 161717.doc 201235693 S inkjet printing can be obtained by a method comprising the steps of: peeling a protective film from a resin sheet, the protective film The adhesive film comprises a base film and an adhesive layer provided on the base film and adhered to the surface of the resin plate, and the adhesive layer contains an ethylene-vinyl acetate copolymer. According to the resin sheet of the present invention, when the ink is dot-pattern printed on the surface of the resin sheet, the disorder of the printed pattern can be sufficiently suppressed. The resin sheet of the present invention v can be preferably used for the manufacture of a light guide plate. EFFECTS OF THE INVENTION According to the present invention, when the reflection point of the light guide plate is formed by the ink jet method, the disorder of the reflection dot pattern can be sufficiently suppressed. [Embodiment] Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments. Fig. 1 is a step diagram showing an embodiment of a method of manufacturing a light guide plate. The method of the present embodiment mainly includes the step of peeling off the protective film 2 from the tree Q grease sheet 2, which comprises the substrate film 25' and the surface of the substrate film 25 adhered to the surface of the resin sheet 15. The adhesive layer 21 is disposed on the surface s of the resin sheet 15 to which the adhesive layer is adhered by an ink jet printing to form a dot pattern; and the reflection point 11 is formed from the ink 1 having the pattern formed. According to this method, the light guide plate 1 including the resin plate 15 and the reflection dots 11 provided on the resin plate 15 can be manufactured. As shown in Fig. 1 (a), the resin sheet 5 is fed in a state in which the protective film 2 is adhered to the surface thereof. The adhesive layer 21 of the protective film 2 contains an ethylene-vinyl acetate copolymer as an elastomer. The ethylene-vinyl acetate copolymer is preferably 161717.doc 201235693 is a monomer unit containing 8 to 20% by mass of vinyl acetate and 80 to 92% by mass of ethylene. The adhesive layer may also contain other ingredients than the ethylene glycol vinegar copolymer. Preferably, the adhesive layer has a material which improves the wettability of a substrate (resin board! 5) selected from the group consisting of rosin-based resin, benzopyrene, resin, and benzo bite: resin and resin. The rosin-based resin is selected from, for example, rosin, polymeric rosin 'gasified turpentine, pine sulphate modified product, and glycerin or pentaerythritol ester of rosin or hydrogenated rosin. Wherein: hydrogenated rosin is preferred. The base film 25 is preferably a polyolefin resin film. The polyolefin resin film contains at least one polyolefin selected from the group consisting of, for example, low-density polyethylene baking, medium-density polyethylene smelting, high-density polyethylene, linear low-density polyolefin, polypropylene, and ethylene-propylene. Resin. The base film 25 may be a single layer film or a multilayer layer comprising two or more layers. 3 Tree Moon Board 15 series, translucent resin sheet. Specifically, the (four) plate 15 is preferably a poly(methyl) acrylate acid vinegar resin sheet, a polystyrene sheet or a polycarbonate sheet. The protective film 2 is peeled off from the resin sheet 15, and the surface s which is one main surface of the resin sheet 15 is exposed (the method of peeling the protective film 2 in FIG. 1(b) is not particularly limited. The resin sheet 15 having the surface S is used for The surface S is printed by ink by an inkjet method to form a printed pattern. That is, a wax-based resin plate for inkjet printing. Then, as shown in the ® 1 (C), the surface of the adhesive layer is adhered. The ink for forming the reflection dots is arranged to form a dot pattern. The ink _ blackhead 5 is ejected in the form of droplets. ^161717.doc 201235693 Ink ίο is an ink which forms a reflection point by hardening or drying, I can use an external hardening ink, an aqueous ink or a solvent ink. Among these inks, an ultraviolet curable ink and an aqueous ink are preferred from the viewpoint of convenience in terms of environmental protection, etc. In the case of using an ultraviolet curable ink, a lamp is used. 7 The step of irradiating the printed ink with ultraviolet rays to harden the ink 1 to form a reflection point containing the hardened ink. When using an aqueous ink or a solvent ink, the ink is dried by a drying device. Drying, forming a reflection point. Any type of ink may contain fine particles such as pigments, or may be transparent to the particles as needed. The protective film 2 containing an ethylene-vinyl acetate copolymer may be used by using the adhesive layer 21. Further, it suppresses the local chaos of the shape of the reflection point μ during the process from the printing to the hardening. For example, it is less likely that the bottom side of the mountain reflection point is diffused, and the adjacent reflection points η are connected to each other. The light guide plate 1 is preferably used as, for example, a light guide plate for an end face illumination type surface light source device constituting a liquid crystal display device. EXAMPLES Hereinafter, the present invention will be further specifically described by way of example (4). However, the present invention is not limited thereto. Examples of the light guide plate are prepared by applying a polymethyl methacrylate resin sheet having a protective film (T〇ray FiIm process, T〇retec 7232) having an adhesive layer containing an ethylene-vinyl acetate copolymer. Thickness 4 mm, size 370 mm). The protective tape is peeled off from the acrylic resin sheet (polymethyl methacrylate resin sheet), and the ink is cured by using ultraviolet rays. Viscosity at 4〇〇c · 8 3 161717.doc , 201235693 mPa · s) The inkjet method, with a resolution of 3〇〇dpi, a resolution of ❹ 丨 or a resolution of 75 dpi, is exposed by the separation The surface of the acrylic resin sheet was printed. The amount of ink droplets was set to about 4 〇 pL, and the scanning speed of the ink jet head was set to 200 mm/s. After 2 seconds from the ink landing, the cumulative light amount 〇·5 J/ The ultraviolet ray of m2 was used to harden the ink to form a reflection point, and the light guide plate of the example was obtained. The film was replaced with a film having an adhesive layer containing polyethylene (Hitalex ML223G, manufactured by Hitachi Chemical Co., Ltd.), and examples. The light guide plate of the comparative example was obtained in the same order. Evaluation The state of the reflection point of the light guide plate was visually observed, and the state was judged by the following reference. The evaluation results are shown in Table 1. A: Adjacent reflection points are not connected to each other, and the formation has a reflection point having a substantially circular bottom surface. B: Adjacent reflection points are connected to each other, and/or shape 戍 戍 has a reflection point having a bottom surface of a shape from a circular turbulence. [Table 1] Example ~ - Adhesive layer - ethylene-vinyl acetate copolymer - reflection point observation result resolution 300 dpi ^ A resolution 150 dpi ............ A ... resolution 75 dpi -------.... A ... Comparative polyethylene
BB
BB
B 如表所示，使用黏貼有包含乙稀-乙 賤·乙烯酯共聚物之 16l717.doc 201235693 黏著層之樹脂板的實施例之導光板係藉由喷墨法而形成之 反射點之形狀相較使用㈣有包含聚乙婦之黏著層之樹脂 板的比較例之導光板，得到顯著改善。即，根據本發明， 可確 < 於藉由喷墨法而形成導光板之反射點之情形時，可 充分地抑制反射點之圖案之紊亂。 【圖式簡單說明】 圖1係表示導光板之製造方法之一實施形態的步驟圖。 Ο _ 【主要元件符號說明】B As shown in the table, the light guide plate of the embodiment in which the resin plate of the adhesive layer of the 161717.doc 201235693 adhesive layer containing the ethylene-acetonitrile-vinyl ester copolymer is adhered is formed by the ink jet method. A light guide plate of a comparative example having a resin plate containing an adhesive layer of a polystyrene was significantly improved. That is, according to the present invention, it is possible to surely suppress the disorder of the pattern of the reflection dots when the reflection point of the light guide plate is formed by the ink jet method. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing an embodiment of a method of manufacturing a light guide plate. Ο _ [Main component symbol description]
1 2 5 7 10 11 15 21 25 S 導光板 保護膜 噴墨頭 燈1 2 5 7 10 11 15 21 25 S Light guide plate Protective film Ink jet head Light
G 油墨 反射點 樹脂板 黏著層 基材獏 黏貼有黏著層21之表面 161717.docG Ink Reflection point Resin board Adhesive layer Substrate 貘 Adhesive surface of adhesive layer 21 161717.doc