579410 A7 B7 五、發明説明（〇 【發明的技術領域】 本發明係有關使用於透過型液晶顯示裝置的背光或照 明平面顯示裝置等面光源的面光源裝置用導光板及其製造 方法。 【先行技術】 ‘以往，已知的使用於透過型液晶顯示裝置的背光或照 明顯示裝置等面光源的面光源裝置，如第5圖的槪略說明 圖所不，係在尚透光性導光板11的端面11 a前方配置直線 狀光源12，在該導光板11射出面的表面側相對設置擴散片 1 3，背面側設置反射片14，再將微小的剖面魚板狀的透鏡 平行配列的透鏡片15、16，使其透鏡條以X、Y方向交叉 配列地予以重疊配設的面光源裝置1 0。 依照這種裝置，光源的光從端面11 a進入導光板11內 ’在上下面間依序反射，自入射端面向相反端面傳播。傳 播於導光板11內的一部分光，從導光板11表面射出，通 過擴散片13成爲擴散光而形成均勻化的亮度面，再通過透 鏡片15、16集光於前面方向而成爲高亮度的面光源。 然而，上述面光源的亮度面，卻有導光板11入射端面 附近比較亮，遠離入射端面亮度漸減而變暗的缺點。 爲了消除這個缺點，已知有特開平2- 1 5779 1號公報， 如第6圖所示，在導光板11背面以乳白色墨水印刷著擴散 圖案17，其印刷面積在導光板11入射端面11a附近較疏， 遠離入射端面1 la較密的方法予以消除。 本紙張尺度適用中國國家標隼（CNS ) Α4規格（210Χ297公釐） —l·---^----ρΐ — 0 I (請先閱讀背面之注意事項再填寫本頁) 訂 #1 經濟部智慧財產局員工消費合作社印製 -4 - 579410 A7 B7_ 五、發明説明（2) 該印刷方式所使用的墨水，雖爲含氧化鈦溶媒中混合 玻璃珠等的微小粒子的墨水，但將這種墨水以絲網（silk screen)印刷等方法直接印在導光板11背面時，從光入射端 面側由疏到密逐漸變化面積所形成的擴散圖案，形成該擴 散圖案的圓形的各個點，尤其在小面積的部分不易正確形 成而常會變形。 又，點的大小本身也難於作到200μπιφ以下。 此情形下，由那種導光板所傳播的光的擴散狀態不符 設計，結果面光源裝置的亮度面會有產生亮度斑點的問題 〇 —方面，爲解決該印刷方式的問題，特開平9- 1383 10 號公報已建議，將形成於導光板背面的擴散圖案的各個點 的形狀部，預先準確形成於導光板的成形模具，於導光板 成形時，同時將該擴散圖案依照設計準確轉印形成的方法 〇 這種成形方式的導光板11的成形模具，係將上述擴散 圖案的各個點的形狀部，以照相蝕刻法來形成。 但是，以照相蝕刻法形成擴散圖案，即使各點的形狀 準確形成，要將光的擴散面形成於細微的凹凸面仍有困難 ，此情形下光的擴散度會降低，結果很難作成滿意的亮度 面而成問題。 【發明所欲解決的課題】 本發明的課題在於，對使用於透過型液晶的背光或照 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X 297公釐） '' -5 - (請先閱讀背面之注意事項再填寫本頁) 訂 ^91. 經濟部智慧財產局員工消費合作社印製 579410 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明説明（3) 明顯示裝置等面光源裝置的導光板中，使傳播於導光板內 的光準確擴散射出於面光源裝置的前面方向的擴散圖案， 在形成時消除上述先行的技術問題。 【發明的目的】 本發明的目的在於，提供擴散光能夠依照設計準確射 出在面光源裝置的導光板前面側，使亮度面全體的亮度均 勻而無斑點，並且能極簡單地以低價格有效率地製造面光 源裝置的面光源裝置用導光板及其製造方法。 本發明的目的也在於，提供能夠將以往所使用的已花 費龐大設計成本所設計的無亮度斑點的印刷用點狀圖案， 直接而且不減低任何效果地予以使用的面光源裝置用導光 板及其製造方法。 【用以解決課題的手段】 爲達成上述目的，本發明的面光源裝置用導光板的特 徵爲：在包括向內部傳播從側面入射的光的導光板，設於 前述導光板側面的光源，設於前述導光板前面的擴散構件 ，及設於前述導光板背面的反射構件所構成的面光源裝置 中，前述導光板，係在透光性基板的至少單面，形成複數 的點狀亂反射部，該亂反射部係由互相重疊或分離的細微 線所形成的擴散面。 再者，本發明的面光源裝置用導光板的製造方法的特 徵爲：在透光性基板所構成的導光板，將光源設於側面， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ----：---訂------ (請先閲讀背面之注意事項再填寫本頁} -6- 579410 A7 ___B7 _ 五、發明説明（4) (請先閱讀背面之注意事項再填寫本頁) 擴散構件設於前面，反射構件設於背面的面光源裝置中， 對前述導光板成形模具的成形面，極微細送出極微小點徑 的雷射光束，以形成由極微細凹凸所構成的點狀亂反射部 所集體形成的擴散圖案面，前述導光板由前述模具予以成 形加工時，同時至少在其單面轉印成形前述擴散圖案面。 本發明的亂反射部，係將極微小的雷射光束點依序在 縱、橫方向連續細微錯開，結果得以形成微小的單一個點 狀，如此形成的各點本身，其加工面會形成極微細的凹凸 狀的面。因此，入射於此點狀加工面的光，會全方向無斑 點地擴散反射。 這種作爲亂反射部的點，將其點狀大小及其配列狀態 適當準確地形成於導光板背面側而成爲擴散圖案面時，從 導光板入射端面入射的光經內部傳播，其一部分在此亂反 射部適確良好地擴散反射，得以向前面方向射出而形成預 定的亮度面。 經濟部智慧財產局員工消費合作社印製 依此作法，本發明的導光板具有，其亂反射部係在導 光板成形之同時以適確狀態轉印形成的點狀，而由此等點 集合配列所形成的擴散圖案，因此每一製品的性能不會產 生差異，而能夠作成高品質、低成本而量產性優異的面光 源裝置用導光板。 又，製造上述導光板時，其作法爲將極微小的點徑的 雷射光束在縱、橫方向連續極微細送出，俾在前述導光板 成形模具的成形面，形成由極微細凹凸狀的面構成的點狀 所集合配列而成的擴散圖案面，前述導光板由前述模具予 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 579410 A7 B7 五、發明説明（5) (請先閱讀背面之注意事項再填寫本頁) 以成形加工時，同時至少在與射出面相反側的背面，轉印 成形爲具有由極微細凹凸狀的面所構成的點狀的多數亂反 射部的擴散圖案面。 依此作法，能夠將導光板擴散圖案面的極微細凹凸狀 的面所構成的點狀亂反射部，容易地，無加工不均勻地， 適確地予以形成，並且每一製品的性能不會產生差異，而 能夠作成高品質、低成本而量產性優異的導光板。 又，前述亂反射部的由極微細凹凸狀的面所構成的各 個點狀，係將成形模具的成形面以雷射光束線加工，作成 最小寬度50μιη〜最大寬度ΙΟΟΟμιη的圓形、橢圓形、矩形、 多角形等，再將該等點所集合配列的擴散圖案面予以轉印 成形爲宜。依此作法得以容易而適確地達成擴散圖案的配 列設計，容易獲得具有均勻亮度面而無亮度斑點的面光源 裝置用導光板。 經濟部智慧財產局員工消費合作社印製 再者，前述的亂反射部由極微細凹凸狀的面所構成的 各個點狀，係將成形模具的成形面以雷射光束施予直徑 5 0〜ΙΟΟΟμηιφ、切入深度2〜15μιη、線距1〜20μιη的縱、橫方 向連續的線加工予以形成，再將該等點所集合配列的擴散 圖案面予以轉印成形爲宜。 依此作法，各點的光得以適當準確地擴散，導光板的 擴散圖案面得以適當準確地充分發揮其功能，而容易獲得 具有均勻亮度面而無亮度斑點的面光源裝置用導光板。 【發明的實施形態】 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ 297公釐） -8- 579410 Α7 Β7 五、發明説明（6) 以下，根據附圖說明有關本發明的實施形態。 第1圖爲說明本發明實施形態之一的導光板的部分剖 面圖’第2圖爲槪略說明上述導光板製造狀態的部分剖面 圖’惟導光板1與說明往例的第5圖的導光板11 一樣，在 其射出面相反側的背面la，全面形成有多數的如第6圖所 示的預定的擴散圖案1 7的點狀亂反射部2。 本發明的亂反射部2，如第2圖所示，係在導光板成形 模具3的導光板背面的成形面，由極微細的凹凸構成的點 狀所形成的多數亂反射部成形面4，於導光板1成形時同時 轉印而成。 轉印上述亂反射部2的模具3的轉印成形面4，係用雷 射光束加工機以雷射光束進行點徑30〜100μιηφ(30〜65 μιηφ爲 宜）、切入深度2〜15μιη(4〜8 μΐΉ爲宜）、線距1〜20μιη (1〜6 μιη爲宜）的極微細的凹凸面加工。 第3圖表示由雷射光束將一個點狀予以圓形加工時的 說明用加工面。此情形爲雷射光束僅以圖上的橫方向移動 ，結果形成直徑50〜ΙΟΟΟμιηφ的圓形點狀的極微細凹凸面5 。第4圖表示同樣將雷射光束移動於圖上的縱、橫方向， 以形成圓形點狀的極微細凹凸面6的加工情形的說明用加 工面。 如此予以加工的成形模具3的亂反射部2的加工面4， 係由雷射光束予以形成各個正確的點狀，因此適確形成依 照設計的擴散圖案面，由此成形的導光板1就具有依照設 計的優良的擴散面。 本紙張尺度適用中國國家標準（CNS ) A4規格（21〇><297公t ) (請先閲讀背面之注意事項再填寫本頁) 訂 經濟部智慧財產局員工消費合作社印製 -9- 579410 A7 B7 五、發明説明（7) 因此，採用本發明的導光板的面光源裝置不會產生亮 度斑點，而能夠作成亮度性能至少與印刷方式的導光板同 等或以上的均勻亮度面的面光源裝置。 又，印刷方式的導光板，其點狀的大小在〇.2mmc|)以下 的印刷頗難，相對於此，本發明的雷射加工能夠很容易地 達到0·05ιηΐΉφ的加工，由此也可完全消除點狀可見的現象。 再者，上述實施形態由雷射光束的加工，也能夠以放 電加工。 又，上述實施形態中的導光板亂反射部的點狀不限於 圓形，橢圓形、矩形、多角形等其他形狀也可以，擴散圖 案的點的配列形態也可任意變更。又，導光板的剖面形狀 不限於上述實施形態，矩形也可以，擴散圖案的形成面不 限於導光板背面側，設於射出面側或兩面也可以。 【實施例】 以下說明有關本發明的面光源裝置用導光板及其製造 方法的具體實施例，並且闡明採用本發明實施例的面光源 裝置用導光板，其導光板射出面整體的均勻亮度特性優於 採用印刷方式導光板的比較例。 本發明的實施例，係採用壓克力的剖面楔狀的矩形板 ，在其背面（與射出面相反側的面）照射雷射光束，作成極微 細的凹凸的點狀而加工形成擴散圖案，對著其板厚較厚的 一側設置線狀光源而成爲面光源裝置。 第1表爲以雷射光束照射在本發明的導光板背面的成 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X 297公釐） — Li —_____0 . - . (讀先閱讀背面之注意事項再填寫本頁) 訂 經濟部智慧財產局員工消費合作社印製 -10- 579410 A7 _B7____ 五、發明説明（8) 形模具的轉印面，作成極微細的凹凸的點狀時的特定加工 條件的一部分數據。此處表示五個樣本的數據。 (讀先閱讀背面之注意事項再填寫本頁) 表中的「輸出」爲所使用的雷射加工裝置的輸出1至 127的刻度中的選定刻度値，「線距」爲光束移送寬度的選 定刻度値。 「點徑」爲雷射光束的照射徑，「點形狀」爲由雷射 光束掃描而形成於照射面的點的形狀，「加工深度」爲雷 射光束在照射面的加工深度的最淺部分及最深部分。 「判定」爲使用由上述加工條件加工的成形模具成形 的導光板所製作的面光源裝置的亮度面的亮度斑點狀態的 判定結果。 第I表579410 A7 B7 V. Description of the invention (0 [Technical Field of the Invention] The present invention relates to a light guide plate for a surface light source device used for a surface light source such as a backlight of a transmissive liquid crystal display device or an illuminated flat display device, and a method for manufacturing the same. [Technology] 'In the past, a known surface light source device used for a surface light source, such as a backlight of a transmissive liquid crystal display device or an illumination display device, was attached to a light-transmitting light guide plate 11 as shown in the schematic illustration of FIG. 5. A linear light source 12 is arranged in front of the end surface 11a of the light guide plate. A diffuser sheet 13 is disposed on the front side of the exit surface of the light guide plate 11, a reflective sheet 14 is disposed on the back side, and a lens sheet having a small cross section of a fish plate-shaped lens is arranged in parallel. 15,16, the surface light source device 10 whose lens strips are arranged in an overlapping arrangement in the X and Y directions. According to this device, the light from the light source enters the light guide plate 11 from the end face 11a, depending on the upper and lower surfaces. Sequential reflection, propagating from the incident end to the opposite end face. Part of the light propagating through the light guide plate 11 is emitted from the surface of the light guide plate 11 and becomes diffused light through the diffusion sheet 13 to form a uniform brightness. The surface is then focused by the lens sheets 15 and 16 in the front direction to become a high-brightness surface light source. However, the brightness surface of the above-mentioned surface light source is brighter near the entrance end face of the light guide plate 11, and away from the entrance end face, the brightness gradually decreases and becomes dark. In order to eliminate this disadvantage, Japanese Unexamined Patent Publication No. 2- 1 5779 1 is known. As shown in FIG. 6, a diffusion pattern 17 is printed on the back of the light guide plate 11 with milky white ink, and the printing area is incident on the light guide plate 11. The area near the end face 11a is relatively sparse, and the distance away from the incident end face 1 la is denser to be eliminated. This paper size applies the Chinese national standard (CNS) A4 specification (210 × 297 mm) —l · --- ^ ---- ρΐ — 0 I (Please read the notes on the back before filling this page) Order # 1 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-4-579410 A7 B7_ V. Description of the invention (2) Although the ink used in this printing method is An ink containing fine particles such as glass beads in a titanium oxide-containing solvent. However, when this ink is directly printed on the back of the light guide plate 11 by a method such as silk screen printing, the light is gradually changed from sparse to dense from the light incident end face side. The diffusion pattern formed by the product, the dots forming the circle of the diffusion pattern, especially in a small area, are not easy to form correctly and often deform. Also, the size of the dot itself is difficult to be less than 200 μm. In this case, The diffusion state of the light propagated by this light guide plate does not match the design. As a result, the brightness surface of the surface light source device may have a problem of brightness speckles. On the one hand, in order to solve the problem of the printing method, Japanese Patent Laid-Open No. 9-1383 10 has suggested, The shape parts of the dots of the diffusion pattern formed on the back of the light guide plate are accurately formed in advance in a forming mold of the light guide plate. When the light guide plate is formed, the diffusion pattern is accurately transferred and formed according to the design. This molding method The forming mold of the light guide plate 11 is formed by forming a shape of each point of the diffusion pattern by a photoetching method. However, if a diffusion pattern is formed by a photoetching method, even if the shapes of the dots are accurately formed, it is still difficult to form a light diffusion surface on a fine concave-convex surface. In this case, the light diffusion degree is reduced, and it is difficult to make a satisfactory result. The brightness side becomes a problem. [Problems to be Solved by the Invention] The problem of the present invention is to apply the Chinese National Standard (CNS) Α4 specification (210X 297 mm) to the backlight or transparent paper size used in transmissive liquid crystals '' -5-(please first Read the notes on the back and fill in this page) Order ^ 91. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 579410 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (3) Surface light sources such as display devices In the light guide plate of the device, the light propagating in the light guide plate is accurately diffused and emitted out of the diffusion pattern in the front direction of the surface light source device, and the above-mentioned prior technical problem is eliminated during formation. [Objective of the Invention] An object of the present invention is to provide diffused light that can be accurately emitted on the front side of a light guide plate of a surface light source device according to a design, so that the brightness of the entire luminance surface is uniform without flecks, and can be extremely simply and efficiently at a low price. A light guide plate for a surface light source device and a method of manufacturing the light guide plate for the surface light source device. It is also an object of the present invention to provide a light guide plate for a surface light source device that can use a dot pattern for printing without brightness spots that has been designed in the past and has taken a large design cost, and which can be used without reducing any effect. Production method. [Means for Solving the Problems] In order to achieve the above object, the light guide plate for a surface light source device of the present invention is characterized in that a light guide plate including a light guide plate that propagates light incident from a side surface to the inside is provided with a light source provided on a side surface of the light guide plate. In a surface light source device composed of a diffusion member in front of the light guide plate and a reflection member provided on the back of the light guide plate, the light guide plate is formed on at least one side of a light-transmitting substrate and forms a plurality of point-like random reflection portions. The random reflection portion is a diffusion surface formed by fine lines overlapping or separated from each other. Furthermore, the method for manufacturing a light guide plate for a surface light source device according to the present invention is characterized in that a light source is provided on a side of a light guide plate composed of a light-transmitting substrate, and this paper size is in accordance with Chinese National Standard (CNS) A4 (210X297) (Mm) ----: --- Order ------ (Please read the notes on the back before filling out this page} -6- 579410 A7 ___B7 _ 5. Description of the invention (4) (Please read the back first For details, please fill in this page again.) The diffuser member is set on the front and the reflective member is set on the surface light source device on the back. The forming surface of the aforementioned light guide plate forming mold sends the laser beam of extremely small spot diameter to form A diffuse pattern surface formed collectively by dot-like random reflection portions composed of extremely fine irregularities, and when the light guide plate is formed by the mold, the diffusion pattern surface is transferred and formed on at least one side at the same time. The extremely small laser beam points are sequentially staggered in the vertical and horizontal directions in succession, resulting in the formation of a tiny single point. The points formed in this way will have a very fine uneven surface on the processed surface. Therefore, the light incident on this point-shaped processing surface will be diffusely reflected in all directions without speckles. This point, which is a random reflection portion, has its point size and arrangement state appropriately and accurately formed on the back side of the light guide plate. When it becomes a diffusion pattern surface, the light incident from the incident end face of the light guide plate propagates internally, and a part of it is diffused and reflected properly in this random reflection part, and it can be emitted in the front direction to form a predetermined brightness surface. According to this method, the consumer cooperative prints, the light guide plate of the present invention has a random reflection portion that is formed in a dot shape while transferring the light guide plate in a proper state, and a diffusion pattern formed by arranging and arranging these points. Therefore, there is no difference in the performance of each product, and it is possible to produce a light guide plate for a surface light source device with high quality, low cost, and excellent mass productivity. In manufacturing the above light guide plate, the method is to reduce The laser beam is continuously and extremely finely emitted in the vertical and horizontal directions, and a point composed of an extremely fine uneven surface is formed on the forming surface of the light guide plate forming mold. Diffusion pattern surface formed by the collection, the aforementioned light guide plate is made by the aforementioned mold to the paper size. Applicable to China National Standard (CNS) A4 specification (210X297 mm) 579410 A7 B7 5. Invention description (5) (Please read the back first (Please note that this page is to be filled in again.) At the same time, during the forming process, at least the back surface opposite to the exit surface is transferred and formed into a diffuse pattern surface with a plurality of irregular reflection portions composed of extremely fine uneven surfaces. In this way, the point-like chaotic reflection portion formed by the extremely fine uneven surface of the light guide plate diffusion pattern surface can be formed easily and without processing unevenness, and the performance of each product is not uniform. Differences can occur, and a light guide plate with high quality, low cost, and excellent mass productivity can be produced. In addition, each dot shape of the chaotic reflection portion composed of extremely fine uneven surfaces is formed by forming the molding surface of the molding die to Laser beam line processing to create a circle, ellipse, rectangle, polygon, etc. with a minimum width of 50 μm to a maximum width of 100 μm, and then arrange the points to arrange the diffusion maps Forming a transfer surface to be appropriate. According to this method, it is possible to easily and appropriately achieve the arrangement design of the diffusion pattern, and it is easy to obtain a light guide plate for a surface light source device having a uniform brightness surface without brightness spots. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The aforementioned random reflection portion is composed of extremely fine concave-convex surfaces, each of which is formed by applying a laser beam to the forming surface of the forming mold with a diameter of 50 to ΙΟΟΟμηιφ. , Cut into a depth of 2 to 15 μm, line spacing of 1 to 20 μm in the vertical and horizontal direction continuous line processing to form, and then these points are arranged in a row of the diffusion pattern surface is suitable for transfer molding. According to this method, the light at each point can be appropriately and accurately diffused, the diffusion pattern surface of the light guide plate can fully and accurately perform its function, and it is easy to obtain a light guide plate for a surface light source device having a uniform brightness surface without brightness spots. [Embodiment of the invention] The paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210 × 297 mm) -8-579410 Α7 B7 5. Description of the invention (6) Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a partial cross-sectional view illustrating a light guide plate according to one embodiment of the present invention. "Second Fig. Is a partial cross-sectional view illustrating the manufacturing state of the above-mentioned light guide plate." Like the light plate 11, a large number of dot-like random reflection portions 2 with predetermined diffusion patterns 17 as shown in FIG. As shown in FIG. 2, the random reflection part 2 of the present invention is formed on the back surface of the light guide plate of the light guide plate forming mold 3. Most of the random reflection part formation surfaces 4 are formed by dots made of extremely fine irregularities. It is transferred at the same time when the light guide plate 1 is formed. The transfer molding surface 4 of the mold 3 to which the random reflection portion 2 is transferred is a laser beam processing machine using a laser beam to perform a spot diameter of 30 to 100 μιηφ (preferably 30 to 65 μιηφ) and a cutting depth of 2 to 15 μιη (4 ~ 8 μΐΉ is preferred), fine pitch surface processing of line pitch 1 ~ 20 μιη (1 ~ 6 μιη is preferred). Fig. 3 shows a processing surface for explanation when a point is circularly processed by a laser beam. In this case, the laser beam moves only in the horizontal direction on the drawing, and as a result, a very fine concave-convex surface with a circular dot shape with a diameter of 50 to 100 μmηφ is formed 5. Fig. 4 shows a processing surface for explaining the processing of moving the laser beam in the vertical and horizontal directions on the drawing to form a circular dot-shaped extremely fine uneven surface 6; The processing surface 4 of the random reflection portion 2 of the molding die 3 processed in this way is formed by laser beams to form each correct point shape. Therefore, a diffusion pattern surface according to the design is appropriately formed. The light guide plate 1 thus formed has Excellent diffusion surface according to design. This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 > < 297g) (Please read the precautions on the back before filling out this page) Order printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives -9- 579410 A7 B7 V. Description of the invention (7) Therefore, the surface light source device using the light guide plate of the present invention does not generate brightness spots, and can be a surface light source with a uniform brightness surface having at least the same brightness performance as or more than that of a light guide plate of a printing method. Device. In addition, the light guide plate of the printing method is difficult to print with a dot size of 0.2 mmc |) or less. In contrast, the laser processing of the present invention can easily achieve a processing of 0. 05ιηΐΉφ. Eliminate the phenomenon of visible spots. In addition, in the above-mentioned embodiment, the laser beam processing can also be performed by electric discharge. In addition, the dot shape of the random reflection portion of the light guide plate in the above embodiment is not limited to a circular shape, and other shapes such as an ellipse, a rectangle, and a polygon may be used. The arrangement pattern of the dots of the diffusion pattern may be arbitrarily changed. The cross-sectional shape of the light guide plate is not limited to the embodiment described above, and it may be rectangular. The surface on which the diffusion pattern is formed is not limited to the back surface side of the light guide plate, and may be provided on the emission surface side or both surfaces. [Examples] Specific examples of the light guide plate for a surface light source device and a method for manufacturing the same according to the present invention will be described below, and the light guide plate for a surface light source device using the embodiment of the present invention will be explained. It is better than the comparative example using the printing light guide plate. In the embodiment of the present invention, an acrylic cross-section wedge-shaped rectangular plate is used, and a laser beam is irradiated on the back surface (the surface opposite to the exit surface) to form extremely fine uneven points and processed to form a diffusion pattern. A linear light source is provided to the thicker side of the plate to form a surface light source device. The first table is the cost paper size applied to the back of the light guide plate of the present invention with a laser beam. Applicable to China National Standard (CNS) A4 specification (210X 297 mm) — Li —_____ 0.-. (Read the precautions on the back before reading (Fill in this page again.) Order Printed by the Intellectual Property Bureau Employees' Cooperative of the Ministry of Economic Affairs -10- 579410 A7 _B7____ V. Description of the invention (8) Part of the specific processing conditions when the transfer surface of the mold is made into extremely fine uneven spots data. Data for five samples are shown here. (Read the precautions on the back before you fill in this page.) "Output" in the table is the selected scale from the scale of output 1 to 127 of the laser processing device used. "Line spacing" is the selection of the beam transfer width. Scale 値. "Spot diameter" is the irradiation diameter of the laser beam, "Spot shape" is the shape of the spot formed on the irradiation surface by scanning the laser beam, and "processing depth" is the shallowest part of the processing depth of the laser beam on the irradiation surface And the deepest part. The "judgment" is a judgment result of the brightness speckle state of the brightness surface of the surface light source device manufactured using the light guide plate formed by the molding die processed under the above processing conditions. Table I
No. 輸出 線距 點徑 點形狀 加工深度/μπι 判定 (M27) (μπι) (μιηφ) 淺 深 亮度斑點 1 4 3 35 圓 4.0 8.0 〇 2 10 5 35 圓 6.0 9.0 〇 3 25 10 70 圓 8.3 10.5 X 4 40 35 70 圆 5.0 rio.o X 5 40 35 70 圓 10.0 22.0 X 經濟部智慧財產局員工消費合作社印製 對本發明導光板1的成形模具3，將其極微細的凹凸的 點狀轉印面以雷射光束照射加工時，爲了將面光源裝置的 亮度斑點控制在規定値以下，其加工條件的選定經進行種 種實驗的結果，如第1表所示，可知以雷射光束加工裝置 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -11 - 579410 A7 _._B7_ _五、發明説明（9) 的輸出4至10、線距（移送寬度）1至12μιη、點徑35μιηφ、 光束加工深度4.0至9.Ομηι進行加工較爲適切。 也可知以其他條件進行加工時，會有例如點狀的周圍 崩塌，或凹凸狀態亦即面粗糙度達不到適切値的情形，皆 爲加工面不能成爲適切狀態，以致面光源裝置的亮度斑點 變大，而成爲不合規格的狀態。 採用以上述的雷射光束加工法將擴散圖案轉印面予以 加工的成形模具3，成形加工本發明導光板1的結果，擴散 圖案的點狀能夠依照設計予以適切形成，與採用以往的印 刷方式形成擴散圖案的導光板的面光源裝置比較，如第2 表所示，採用本發明導光板1的面光源裝置的亮度均勻度 ，明顯高於以往的印刷方式的面光源裝置。 第2表中’印刷墨水A、印刷墨水B、印刷墨水C，分 別表示使用不同墨水同一擴散圖案的印刷方式導光板的面 光源裝置亮度面的亮度値（nit)，Max、Min、Typ分別爲上述 面光源裝置亮度面的9點測定數據的最大値、最小値、平 均値，均勻度爲上述最小亮度値對最大亮度値的比率（％)。 對於本發明品也相同。 (請先閲讀背面之注意事項再填寫本頁) 衣· 訂 f 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -12- 579410 Α7 Β7 五、發明説明（4 第2表 印刷墨水A 印刷墨水B 印刷墨水C 本發明品 Typ 2679 2626 2666 2732 Max 2926 2800 2946 2919 Min 2538 2453 2498 2608 均勻度 86.7 87.6 84.7 89.3 (請先閲讀背面之注意事項再填寫本頁) 【發明的效果】 依照本發明，因係以雷達光束將點狀亂反射部的成形 面正確形成於導光板本身的成形模具，導光板成形時將其 亂反射部同時一體成形，故各亂反射部會依照設計適確構 成擴散圖案而形成導光板，使用這種導光板的面光源裝置 ，不會產生亮度斑點，而能夠作成亮度性能至少與印刷方 式的導光板同等或以上的均勻亮度面的面光源裝置。 經濟部智慧財產局員工消費合作社印製 又依照本發明，可提供能夠將以往所使用的已花費龐 大設計成本所設計的無亮度斑點的印刷用點狀圖案，直接 而且不減低任何效果地予以使用的面光源裝置用導光板及 其製造方法。 再者依照本發明，相對於印刷方式的導光板，其點狀 的大小在0·2πιιήΦ以下的印刷頗難，而本發明的雷射加工能 夠很容易地達到〇·〇5ιηιηφ的加工，由此也可完全消除點狀可 見的現象。此點也爲優異的均勻亮度面的面光源裝置。 【圖面的簡單說明】 本紙張尺度適用中國國家標準（CNS ) Α4規格（210 X 297公釐） -13- 579410 Μ __ Β7 五、發明説明（d 第1圖：本發明實施形態之一的導光板的部分剖面說 明圖。 第2圖：上述實施形態的導光板製造狀態的部分剖面 5兌明圖。 第3圖：形成本發明實施形態之一的亂反射部的點狀 .加工面說明圖。 第4圖：上述點狀加工面的不同實施形態的說明圖。 第5圖：使用導光板的以往的面光源裝置的分解槪略 6兌明圖。 第6圖：表示以往設於上述導光板的亂反射部的擴散 圖案狀態的槪略說明圖。 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 【圖號說明】 1 導光板 la 背面 2 亂反射部 3 模具 4 亂反射部成形面 5 圓形點狀的極微細凹凸面 6 圓形點狀的極微細凹凸面 10 面光源裝置 11 導光板 11 a 端面 12 直線狀光源 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -14- 579410 A7 B7 五、發明説明（〇 13 擴散片 14 反散片 1 5、1 6 透鏡片 17 擴散款式 (請先閱讀背面之注意事項再填寫本頁) 經濟智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -15-No. Output line pitch Dot shape processing depth / μπι judgment (M27) (μπι) (μιηφ) light and deep brightness spots 1 4 3 35 circle 4.0 8.0 〇2 10 5 35 circle 6.0 9.0 〇3 25 10 70 circle 8.3 10.5 X 4 40 35 70 circle 5.0 rio.o X 5 40 35 70 circle 10.0 22.0 X Printing mold 3 for light guide plate 1 of the present invention is printed by the consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, and its extremely fine uneven point-shaped transfer surface In order to control the brightness speckle of the surface light source device to a predetermined value or less when processing with a laser beam, the processing conditions were selected and various experiments were performed. As shown in Table 1, it can be seen that the laser beam processing device is used for the paper. The scale is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) -11-579410 A7 _._ B7_ _ V. The output of invention description (9) 4 to 10, line spacing (transfer width) 1 to 12 μm, point diameter 35μιηφ, beam processing depth 4.0 to 9.〇μηι is more suitable for processing. It can also be seen that when processing is performed under other conditions, for example, point-like surrounding collapse, or unevenness, that is, the surface roughness cannot reach an appropriate level, all the processed surfaces cannot be an appropriate state, so that the brightness spots of the surface light source device It becomes large and becomes substandard. Using the forming mold 3 for processing the diffusion pattern transfer surface by the above-mentioned laser beam processing method, and as a result of forming and processing the light guide plate 1 of the present invention, the dots of the diffusion pattern can be appropriately formed according to the design, and formed by using the conventional printing method. Compared with the surface light source device of the light guide plate of the diffusion pattern, as shown in Table 2, the brightness uniformity of the surface light source device using the light guide plate 1 of the present invention is significantly higher than that of the conventional surface light source device of the printing method. In Table 2, 'printing ink A, printing ink B, and printing ink C respectively represent the brightness 値 (nit) of the brightness surface of the surface light source device of the light guide plate of the printing method using the same diffusion pattern of different inks, and Max, Min, and Typ are respectively The maximum 値, minimum 値, and average 値 of the nine-point measurement data of the brightness surface of the surface light source device are uniformity, which is a ratio (%) of the minimum 値 to the maximum 値. The same applies to the product of the present invention. (Please read the precautions on the back before filling out this page) Clothing · Ordering f Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs Employee Cooperatives This paper is printed in accordance with China National Standard (CNS) A4 (210X297 mm) -12- 579410 Α7 Β7 V. Description of the invention (4 Table 2 Printing ink A Printing ink B Printing ink C The product of this invention Typ 2679 2626 2666 2732 Max 2926 2800 2946 2919 Min 2538 2453 2498 2608 Uniformity 86.7 87.6 84.7 89.3 (Please read the precautions on the back first (Fill in this page again.) [Effects of the invention] According to the present invention, since the forming surface of the spot-shaped random reflection portion is accurately formed on the light guide plate itself by the radar beam, the random reflection portion is formed integrally at the same time when the light guide plate is formed. Therefore, each random reflection part will form a light guide plate according to the design to properly form a diffusion pattern. The surface light source device using this light guide plate will not produce brightness spots, and can be made to have a brightness performance at least equal to or better than that of a light guide plate in a printing method. Surface light source device with uniform brightness surface. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and according to the present invention, A light guide plate for a surface light source device and a manufacturing method thereof that can be used directly and without reducing any effect, which have been used in the past, and which do not have any effect, can be used to design a dot pattern without brightness speckles, which has been used for a large design cost. Compared with the light guide plate of the printing method, the dot-like size is difficult to print below 0 · 2πιήήΦ, and the laser processing of the present invention can easily reach the processing of 〇 · 05ιηιηφ, thereby also completely eliminating dots This phenomenon is visible. This point is also an excellent uniform light surface area light source device. [Simplified description of the drawing] This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -13-579410 Μ __ Β7 V. Description of the invention (d Figure 1: Partial cross-sectional view of the light guide plate according to one embodiment of the present invention. Figure 2: Partial cross-section 5 of the manufacturing state of the light guide plate according to the above embodiment. Figure 3 : Dot-shaped. Working surface explanatory diagram of the random reflection portion forming one of the embodiments of the present invention. Fig. 4: Illustration of different embodiments of the dot-shaped processed surface described above. 5 : Explanatory diagram 6 of a conventional surface light source device using a light guide plate. Figure 6: A schematic explanatory diagram showing a diffusion pattern state of a random reflection portion provided in the light guide plate in the past. (Please read the back Note: Please fill in this page again.) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. [Illustration of the drawing number] 1 The back of the light guide plate 2 The random reflection part 3 The mold 4 The irregular reflection part forming surface 5 The circular dot-shaped extremely fine uneven surface 6 Circular point-shaped ultra-fine uneven surface 10 surface light source device 11 light guide plate 11 a end surface 12 linear light source This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) -14- 579410 A7 B7 V. Description of the invention (〇13 Diffusion sheet 14 Anti-scatter sheet 1 5, 16 Lens sheet 17 Diffusion pattern (please read the precautions on the back before filling this page) Printed by the Employees and Cooperatives of the Bureau of Economics and Intellectual Property Co., Ltd. This paper is in accordance with Chinese national standards (CNS ) A4 size (210X297mm) -15-