201100723 六、發明說明 【發明所屬之技術領域】 本發明係有關邊緣照明型照明裝置。有關之照明裝置 係作爲使用在辦公室或家屋的屋內之照明裝置而爲有用。 【先前技術】 作爲所謂邊緣照明型之照明裝置，係廣泛知道有光 源’和爲了使從該光源入射的光進行面發光的導光板，和 於該導光板的出光面側具備光擴散板，從有關之光擴散板 射出的光之亮度呈均一地加以控制之照明裝置（例如，參 照專利文獻1~6 )。 以往技術文獻 [專利文獻] [專利文獻1]日本特開平4-257824號公報 [專利文獻2 ]日本特開平8 - 4 1 8 3 1號公報 [專利文獻3]日本特開平8-41832號公報 [專利文獻4]日本特開平3 -5 726號公報 [專利文獻5]日本特開平5-196940號公報 [專利文獻6]日本特開平3-256090號公報 【發明內容】 [發明欲解決之課題] 但在將以往的邊緣照明型照明裝置在辦公室或家屋的 屋內使用時’在屋內的人未必充分感受到明亮度。因此， 201100723 本發明的目的係提供在屋內的人可感受良好明亮度之邊緣 照明型照明裝置。 [爲解決課題之手段] 本發明者們係銳意檢討的結果，至完成可達成上述目 的之本發明。即，本發明係屬於具備略四角形狀的導光 板，和配設於該導光板之至少1個側端面側之光源，和配 設於與射出從前述光源射出而入射至前述導光板之側端面 的光之該導光板之出光面對向之反射面側的略四角形狀的 反射薄膜，和配設前述導光板之出光面側的略四角形狀的 光擴散板，於前述導光板之反射面的表面，形成亂反射光 的亂反射部之邊緣照明型照明裝置，其特徵乃在前述光擴 散板之外表面，有該光擴散板之1邊的附近之亮度A,、 與前述1邊對向之1邊的附近之亮度A2、及與此等對向 之2邊等距離地描繪的線附近之亮度B乃滿足下述式 (1 )及（2 )者之邊緣照明型照明裝置。 式（1 ) : 1.2XA! S B S 3 _0χΑι 式（2 ) : 1 .2χΑ2 ^ Β ^ 3.0χΑ2 [發明效果] 如根據本發明，可提供在屋內的人可感受良好明亮度 之邊緣照明型照明裝置。加上，本發明之邊緣照明型照明 裝置係在其法線方向的正下方之照度亦爲良好’特別是作 -6- 201100723 爲在屋內之照明裝置爲最佳° 【實施方式】 對於本發明之邊緣照明型照明裝置，參照圖1乃至圖 3同時加以說明，但本發明並不限定於此。圖1乃模式性 地顯示配設光源於導光板之對向的2個側端面側所成之本 發明之邊緣照明型照明裝置之一例的剖面圖。圖2乃模式 性地顯示配設光源於導光板之1個側端面側所成之本發明 〇 之邊緣照明型照明裝置之一例的剖面圖。圖3乃模式性地 顯示配設光源於導光板之對向的2個側端面側所成之本發 明之邊緣照明型照明裝置之一例的斜視圖。如圖1乃至圖 3所示，本發明之邊緣照明型照明裝置7係具備導光板 1，和配設於導光板1之至少1個側端面側之光源2A，和 配設於與射出從光源2A射出而入射至導光板1之側端面 的光之導光板1之出光面對向之反射面側的反射薄膜3, Q 和配設於導光板1之出光面側之略四角形狀的光擴散板 6 0 導光板1係光透過性良好之透明基板者爲佳。作爲透 明基板的材質，例如可舉出異丁烯樹脂、聚碳酸酯樹脂、 聚苯乙烯樹脂、聚烯烴酸酯樹脂等之1種以上的熱可塑性 樹脂等。另外’作爲透明基板，亦可使用此等樹脂之層積 體。其中’從透明性，導光性，加工性的點，異丁烯樹脂 爲佳。異丁烯樹脂係全光線透過率乃90%以上者爲更佳。 導光板1係略四角形狀的平板爲佳。在此所稱之略四 201100723 角形狀係意味正方形，長方形，菱形等4條邊所成之形 狀，但其頂角部乃呈帶有圓弧進行加工亦可。導光板1的 厚度乃通常程度，理想乃3〜8mm。然而’導光板 1之厚度係從良好地使從後述之光源2A射出的光進行入 光的點，較光源2A (或其單元全體）之厚度爲厚者爲 佳。 作爲光源2A，如在圖2所示地配設於導光板1之1 個側端面側亦可，而如在圖1及圖3所示地，配設於相互 對向之2個側端面側亦可。作爲光源，可舉出螢光燈’冷 陰極管，LED等。使用螢光燈或冷陰極管的情況，通常， 與在導光板側端面的長度方向略平行地加以配設。使用 LED之情況，通常，與在導光板側端面的長度方向略平行 地複數個配設LED。特別是，LED係因尺寸小之故，在可 薄型化照明而爲有用。對於LED的顏色，雖無特別限 制，但在住宅，辦公室，商業設施等之屋內，或加油站 內，車輛內使用上，白色爲佳。然而，作爲白色LED，可 舉出經由藍色LED與黃色螢光體之組合而發光成白色光 的LED，或經由組合紅，藍，綠各LED之時而發光成白 色光的LED等。 作爲配設於導光板1之反射面側的反射薄膜3，例如 可舉出白色聚酯製之低發泡薄膜，或於玻璃或者塑料薄 膜，蒸鍍反射率高的金屬之薄膜等。反射薄膜3的厚度係 通常50〜400 // m程度。 於導光板1之出光面側配設光擴散板6。作爲有關之 -8 - 201100723 光擴散板6，可採用對於透明基板賦予光擴散性能之以往 公知的光擴散板者。作爲有關之透明基板的材質，與前述 之導光板同樣，例如可舉出異丁烯樹脂、聚碳酸酯樹脂、 聚苯乙烯樹脂、聚烯烴酸酯樹脂等之1種以上的熱可塑性 樹脂等。另外，作爲光擴散板，亦可使用此等樹脂之層積 體。其中，從成形性，表面硬度的點，異丁烯樹脂爲佳。 作爲賦予光擴散性能於前述透明基板之方法，可採用以往 0 公知的方法，例如可舉出於透明基板表面施以凹凸形狀的 方法，或於透明基板內，含有與該透明基板折射率不同之 1種以上的光擴散劑之方法等。作爲其光擴散劑，可舉出 丙烯酸系交聯片，MS系交聯片等之有機系微粒子，或二 氧化矽，氧化鈦，硫酸鋇等之無機系微粒子。其中，前述 有機系微粒子爲佳。光擴散板6係霧度値乃80〜1〇〇%，全 光線透過率乃3 5〜8 0 %爲佳。 光擴散板6係與前述之導光板1同樣，略四角形狀的 平板爲佳。其厚度係通常 程度，理想爲 0 · 5 〜4mm 〇 具備前述各構件之本發明的邊緣照明型照明裝置係其 特徵乃在光擴散板6之外表面，有光擴散板6之1邊的附 近之亮度Ai、與前述1邊對向之1邊的附近之亮度八2、 及與此等對向之2邊等距離地描繪的線附近之亮度B乃滿 足下述式（1)及（2)者。 式（1 ) : 1.2xAi S B S 3-OxA! 201100723 式（2 ) ： 1.2xA2 ^ B ^ 3.0χΑ2 滿足前述式（1 )及式（2 )之邊緣照明型照明裝置係 具體而言，意味比較於在該照明裝置之兩端部附近的亮 度，該照明裝置之中央部附近的亮度則相當程度變高 (1.2倍以上3.0倍以下）之照明裝置者。即，意味對於 該照明裝置之兩端部附近與中央部附近的亮度產生相當程 度的不勻（unevenness )者。並且，經由照明裝置滿足如 此之物性値者，即經由具有適度之亮度不勻者，將該照明 裝置例如設置於屋內頂部之情況，發揮屋內的人可感受良 好明亮度之效果。加上，在將照射光線之屋內內側周邊部 的照度適度地保持，在該照明裝置之法線方向正下方可獲 得充分的照度，特別是作爲在屋內之照明裝置爲最佳。 亮度 Αι、売度 A2、亮度B乃滿足下述式（3)及 (4 )之邊緣照明型照明裝置乃更佳。 式（3 ) ： 1,4χΑι ^ Β ^ 2.5χΑ! 式（4 ) ： 1.4χΑ2 ^ Β ^ 2.5χΑ2 對於亮度Β乃對於亮度Α,或亮度人2而言未達1.2倍 之情況，看該照明裝置的人所感受的亮度，或在該照明裝 置之法線方向正下方的照度乃並不充分。另一方面，對於 亮度B乃對於亮度A,或亮度八2而言超過3.0倍之情況， 例如在使用該照明裝置於屋內時之該屋內之內側周邊部的 -10- 201100723 照度乃並不充分。 從光源2A射出的光係從導光板1之側端面射入至導 光板1內。並且，其入射光係在導光板1內重複反射時， 在亂反射部1 0進行亂反射，接著從導光板1的出光面射 出。另外，前述導光板1內的光的一部分乃爲了防止從亂 反射部1 〇或亂反射部10之間出光，反射其光而再次射入 至導光板1內，而配設反射薄膜3(圖1乃至圖3)。 π 前述亂反射部10係形成爲由略圓狀，略點狀，略四 〇 角形狀等所成之點狀，或條紋狀，其中點狀爲佳。另外， 作爲其亂反射部之形成方法，例如可舉出將導光板1表面 網化之方法，或施以特定之楔型加工的方法，將特定油墨 等進行網版印刷或蒸鍍之方法。此等之中，經由網版印刷 而形成者爲佳。作爲前述油墨，係可採用以往公知之構 成，例如可舉出氧化鈦微粒子、二氧化矽微粒子、丙烯酸 系珠、含有爲了使細微中空粒子等的光進行亂反射的微粒 Q 子之揮發硬化型之油墨或紫外線硬化型之油墨等。網版印 刷係在室溫附近，於導光板塗佈上述油墨之後，經由以室 溫〜80°C程度進行乾燥而進行。 前述亂反射部1 〇係從照度等的點，隨著從配設有光 源2A之側端面側遠離，呈其點密度變高地加以形成者爲 佳。作爲呈點密度變高地形成之方法，係可舉出（1 )將 點的間距（中心間距離）做成一定，隨著從配設有光源 2A之側端面側遠離，提昇點面積之方法，或（2 )將點面 積做成一定，隨著從配設有光源2A之側端面側遠離’縮 -11 - 201100723 短點的間距之方法等。另外，形成點狀之亂反射部的情 況’點面積係通常爲0.3〜2.0mm2，而理想爲 。點的間距係通常爲0.5〜3.0mm，而理想爲i .〇〜2.0mni。 每單位面積所佔的點的密度’即點佔有密度係通常爲 10~60% ’而理想爲20〜55%。另外’有關之點狀的亂反射 部係各平行地配列於導光板1之縱方向及橫方向亦可，而 亦可一部分偏移加以配列。更且，經由從任意的1個點的 中心連結與該點鄰接之點的中心之時，呈描繪正三角形地 加以配列者更佳。 本發明之邊緣照明型照明裝置係如上述，亮度B乃對 於亮度Αι或亮度Az而言滿足前述（1)及（2)者作爲要 件。有關的要件係經由適宜調整前述亂反射部之形成圖案 者而加以具備。具體而言，將前述之點狀或條紋狀的亂反 射部形成於導光板1 ’實際組裝邊緣照明型照明裝置而進 行評估，未滿足前述式（1 )及（2 )的情況係大小調整亂 反射部之密度’再次組裝該裝置，以及進行評估。由反覆 如此之操作，製作滿足前述式（1 )及（2 )之邊緣照明型 照明裝置。 例如’將前述亂反射部形成爲點狀之情況，由隨著從 配設有光源2A之側端面側遠離，其點密度變高之圖案加 以形成，更且其圖案乃經由 (A)前述亮度B乃對於前述亮度Ai或亮度A2而言 未達1 · 2倍之情況’減少配設有前述光源之側端面側附近 的點密度’且增加點密度成爲最高之範圍的點密度， -12- 201100723 (B)前述亮度B乃對於前述亮度A!或亮度A2 超過3 · 0倍之情況，增加配設有前述光源之側端面側 的點密度，且減少點密度成爲最高之範圍的點密度， 其點密度者，製作滿足前述式（1 )及（2 )之邊緣照 照明裝置。 在本發明中，爲了良好地將從光源2A射出的光 至導光板1，如圖1乃至圖3所示，將反射薄膜3延 β 光源2A附近加以配設者爲佳，更且於光源2A附近 〇 反射器4爲佳。有關之反射器4係在光源2Α附近， 設於反射薄膜3之相反側（圖1乃至圖3)，可配 LED光源2Α之後方（與導光板1相反方向）者（ 示）。作爲反射器4係例如可使用與前述反射薄膜同 之反射器，其厚度係通常爲5 0〜4 0〇βιη程度。 另外，如在圖2所示，對於配設光源2Α於導光 之1個側端面側之情況，於與配設光源2Α之側端面 Q 的側端面側，貼附反射薄膜者爲佳。有關之反射薄膜 使用與前述之反射薄膜同材質之構成。另外，對於在 板1未配設光源2Α之其他的側端面’亦貼附前述反 膜爲佳。 更且，如圖1乃至圖3所示，導光板〗、光源 反射薄膜3等各構件係通常收納於鋁等金屬製的框 內。 然而，於前述光擴散板之更外側’可配設稜鏡 (未圖示）。 而言 附近 調整 明型 射入 伸至 配設 可配 設於 未圖 材質 板1 對向 係可 導光 射薄 2Α、 體5 片者 -13- 201100723 [實施例] 以下，顯示本發明之實施例及比較例，但本發明並不 限定於此等。然而，對於實施例及比較例之邊緣照明型照 明裝置，經由下述試驗法而加以評估。 (1 )亮度測定 將邊緣照明型照明裝置，配置於寬2m，深度2m，高 度2m的箱狀黑室之頂部中央。頂部，壁的反射率（85°反 射率）係作爲0%。另外，邊緣照明型照明裝置的消耗電 力係作爲64W，從照明出射面對於該面的法線方向相距 5 00mm之位置，設置測定用攝影機，使用日本（股）I systen公司製之「E.ye Scaled」而測定在下述特定位置之 亮度。 (A )從配設有光源側之光擴散板的1邊，對於該光 擴散板之長度方向相距20mm之位置的亮度作爲A,。 (B) 從前述1邊與對向在光擴散板之長度方向之1 邊，對於該光擴散板之長度方向相距20mm之位置的亮度 作爲A2。 (C) 與各記載於前述（A)及（B)之各邊等距離 (從各邊75mm )之亮度作爲B。 (2 )照度測定 將邊緣照明型照明裝置，配置於寬3m，深度3m，高 度2m的箱狀白室之頂部中央。頂部，壁的反射率（8 5 °反 射率）係作爲3 0%。另外，邊緣照明型照明裝置的消耗電 14- 201100723 力係作爲64W，使用東京光電公司製之ANA-F12照度計 測定在從照明出射面正下方1 1 〇〇mm位置之照度。 (3 )人所感受之明亮度（稱作「人感度」） 觀測者進入至前述箱狀的白室內，以目視觀測被評估 對象之邊緣照明型照明裝置，該觀測者充分感受到明亮之 情況乃◎，感受若干明亮的情況乃〇，感受若千暗的情況 乃△，感受暗的情況乃X。 〇 實施例1，比較例1 使用下述所示之構件而做成邊緣照明型照明裝置。 <邊緣照明型照明裝置之構件> (導光板） 使用形成爲厚度5mm、縱150mmx橫1 200mm之異丁 烯樹脂組成物（日本住友化學公司製之「SUMIPEX E005」）。 (使用於網版印刷之油墨） 對於此導光板之表面（反射面），使用下述油墨，以 網版印刷實施略圓狀的點形狀。 揮發硬化型樹脂油墨 7 6.8重量％ 丙烯酸珠 16.4重量％ 二氧化矽微粒子 3 · 2重量％ 螢光體 3.6重量％ -15- 201100723 (關於點圖案） 前述點係將其間距（中心間距離）做成一定’隨著從 配設有光源之側端面側遠離，其點面積變高地形成。另 外，將縱軸作爲每單位面積所佔之點的密度（點佔有密 度），將橫軸作爲從導光板之前述側端面側的距離的圖 表，示於圖4(實施例1)及圖5 (比較例1)。更且’表示任 意的1個點，和與該點鄰接的點之位置關係的圖’示於圖 6 0 然而，在實施例1中，將點的間距作爲ι73mm ’最 小直徑係作爲〇 . 8 3 mm，最大直徑係作爲1 · 3 1 mm ’在比較 例1中，將點的間距作爲1 · 7 3 m m ’最小直徑係作爲 1.04mm，最大直徑係作爲1.26mm。 (光擴散板） 使用形成爲厚度2mm、縱150mm X橫1 2 0 0mm之異丁 烯樹脂組成物（日本住友化學公司製之「SUMIPEX E5 3 5」）。 (光源） 作爲光源，使用 24〇個 CREE公司製之白色 LED(0.27W/個）。另外，於在導光板之5mmxl200mm之2 個側端面側，各呈各1 20個成爲略直線狀地配設前述白色 LED。 -16- 201100723 (反射薄膜） 於前述導光板之反射面側，配設日本TORAY(股）公 司製之「E60」薄膜（厚度 180#m、縱 150mmx橫 1 208mm )。更且，對於未配設有光源之導光板的側端面 側，亦貼附前述「E60」薄膜（厚度180#m、5mmx 15 0mm) ° Ο (反射器） 於前述光源的下側（出光面側），作爲反射器，配設 日本TORAY(股）公司製之「Ε60」薄膜（厚度180#rn、 縱 14mmx 橫 1200mm)。 將實施例1及比較例1之結果示於表1 【表1】 亮度〜 亮度A2 亮度B Ατ/Β α2/β 法線方向正 下方的亮度 (lx) 人感度 實施例1 1699 1699 2886 1.69 1. 69 1290 ◎ 比較例1 2602 2602 2719 1.04 Τ. 04 1280 △201100723 VI. Description of the Invention [Technical Field of the Invention] The present invention relates to an edge illumination type lighting device. The lighting device is useful as a lighting device for use in an office or a house. [Prior Art] As the illumination device of the edge illumination type, a light source ′ and a light guide plate for causing surface light to be incident from the light source are provided, and a light diffusion plate is provided on the light exit surface side of the light guide plate. The illuminating device in which the brightness of the light emitted from the light diffusing plate is uniformly controlled (for example, refer to Patent Documents 1 to 6). [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 8- No. Hei 8- No. Hei 8- No. 8-41832 [Patent Document 4] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. However, when the conventional edge-lit lighting device is used in an office or a house, the person inside the house may not fully feel the brightness. Therefore, 201100723 aims to provide an edge-lit illuminating device in which a person in the house can feel good brightness. [Means for Solving the Problem] The inventors of the present invention made a result of keen evaluation, and completed the present invention which can achieve the above object. In other words, the present invention relates to a light guide plate having a substantially square shape, and a light source disposed on at least one side end surface side of the light guide plate, and a light source that is emitted from the light source and incident on the side surface of the light guide plate. a light-diffusing sheet of the light guide plate facing the reflective surface on the side of the reflective surface, and a light diffusing plate having a slightly square shape on the light-emitting surface side of the light guide plate, on the reflective surface of the light guide plate An edge illumination type illuminating device that forms a chaotic reflection portion that illuminates the reflected light, and has a brightness A in the vicinity of one side of the light diffusing plate on the outer surface of the light diffusing plate, and is opposite to the one side The brightness A2 in the vicinity of one side and the brightness B in the vicinity of the line drawn equidistant from the two sides of the opposite sides are edge lighting type illumination devices satisfying the following formulas (1) and (2). Formula (1): 1.2XA! SBS 3 _0χΑι Formula (2): 1.2 χΑ 2 ^ Β ^ 3.0χΑ2 [Effect of the Invention] According to the present invention, it is possible to provide an edge-illuminated illumination in which a person in the house can feel good brightness. Device. In addition, the illuminating device of the edge-illuminating device of the present invention has a good illuminance just below the normal direction thereof. In particular, it is -6-201100723, which is optimal for the lighting device in the house. [Embodiment] The edge illumination type illumination device of the present invention will be described with reference to Fig. 1 through Fig. 3, but the present invention is not limited thereto. Fig. 1 is a cross-sectional view schematically showing an example of the edge illumination type illumination device of the present invention in which the light source is disposed on the two side end faces of the light guide plate. Fig. 2 is a cross-sectional view schematically showing an example of an edge illumination type illumination device of the present invention in which a light source is disposed on one side end surface side of a light guide plate. Fig. 3 is a perspective view schematically showing an example of the edge illumination type illumination device of the present invention in which the light source is disposed on the two side end faces of the light guide plate. As shown in FIG. 1 to FIG. 3, the edge illumination type illumination device 7 of the present invention includes a light guide plate 1 and a light source 2A disposed on at least one side end surface side of the light guide plate 1, and is disposed and emitted from the light source. 2A, the light-emitting plate 1 of the light incident on the side end surface of the light guide plate 1 faces the reflective film 3 on the side of the reflecting surface, Q, and the light diffusion of the substantially square shape disposed on the light-emitting surface side of the light guide plate 1 Plate 60 The light guide plate 1 is preferably a transparent substrate having good light transmittance. The material of the transparent substrate may, for example, be one or more thermoplastic resins such as an isobutylene resin, a polycarbonate resin, a polystyrene resin or a polyolefin resin. Further, as the transparent substrate, a laminate of these resins can also be used. Among them, isobutylene resin is preferred from the viewpoints of transparency, light guiding property and workability. It is more preferable that the isobutylene resin has a total light transmittance of 90% or more. The light guide plate 1 is preferably a flat plate having a square shape. It is referred to herein as a little four. 201100723 The angular shape means a shape formed by four sides of a square, a rectangle, a rhombus, etc., but the top corner portion may be processed with an arc. The thickness of the light guide plate 1 is usually a degree, and is preferably 3 to 8 mm. However, the thickness of the light guide plate 1 is preferably such that the thickness of the light source 2A (or the entire unit thereof) is thicker than the light emitted from the light source 2A to be described later. As the light source 2A, as shown in FIG. 2, it may be disposed on one side end surface side of the light guide plate 1, and as shown in FIG. 1 and FIG. 3, it may be disposed on the two side end faces of the opposite sides. Also. Examples of the light source include a fluorescent lamp 'cold cathode tube, an LED, and the like. In the case of using a fluorescent lamp or a cold cathode tube, it is usually arranged in a direction slightly parallel to the longitudinal direction of the end surface of the light guide plate. In the case of using an LED, generally, LEDs are disposed in plurality in parallel with the longitudinal direction of the end surface of the light guide plate. In particular, LEDs are useful for thinning illumination because of their small size. The color of the LED is not particularly limited, but in a house such as a house, an office, a commercial facility, or a gas station, white is preferred for use in a vehicle. However, as the white LED, an LED that emits white light by a combination of a blue LED and a yellow phosphor, or an LED that emits white light by combining red, blue, and green LEDs may be used. The reflective film 3 disposed on the side of the reflecting surface of the light guide plate 1 may, for example, be a low foaming film made of white polyester or a film of a metal having a high reflectance in a glass or plastic film. The thickness of the reflective film 3 is usually about 50 to 400 // m. A light diffusing plate 6 is disposed on the light emitting surface side of the light guide plate 1. As the light diffusing plate 6 of -8 - 201100723, a conventionally known light diffusing plate which imparts light diffusing performance to a transparent substrate can be used. The material of the transparent substrate is, for example, a thermoplastic resin such as an isobutylene resin, a polycarbonate resin, a polystyrene resin or a polyolefin resin, and the like. Further, as the light diffusing plate, a laminate of these resins can also be used. Among them, isobutylene resin is preferred from the viewpoint of formability and surface hardness. As a method of imparting light diffusing performance to the transparent substrate, a conventionally known method can be employed, and for example, a method of applying a concave-convex shape to a surface of a transparent substrate or a refractive index different from that of the transparent substrate may be employed in the transparent substrate. A method of one or more kinds of light diffusing agents, and the like. Examples of the light-diffusing agent include organic-based fine particles such as an acrylic cross-linked sheet, an MS-based crosslinked sheet, and inorganic fine particles such as cerium oxide, titanium oxide or barium sulfate. Among them, the organic fine particles are preferred. The light diffusing plate 6 has a haze of 80 to 1%, and a total light transmittance of 3 5 to 80% is preferable. Similarly to the above-described light guide plate 1, the light diffusing plate 6 is preferably a flat plate having a square shape. The edge-illuminated illumination device of the present invention having the above-described respective members is characterized in that it has a thickness of about 0.5 to 4 mm, and is characterized in that it is on the outer surface of the light diffusing plate 6 and is in the vicinity of one side of the light diffusing plate 6. The brightness Ai, the brightness 8.2 in the vicinity of one side of the one side opposite to the one side, and the brightness B in the vicinity of the line drawn equidistant from the two sides of the opposite sides satisfy the following formulas (1) and (2). )By. Equation (1) : 1.2xAi SBS 3-OxA! 201100723 Equation (2) : 1.2xA2 ^ B ^ 3.0χΑ2 The edge-illuminated illumination device that satisfies the above equations (1) and (2) is specifically In the vicinity of the end portions of the illuminating device, the brightness of the vicinity of the central portion of the illuminating device is considerably higher (1.2 times or more and 3.0 times or less). That is, it means that a degree of unevenness is generated for the brightness near the both end portions of the illumination device and the vicinity of the central portion. Further, the illuminating device satisfies the physical properties of the illuminating device, that is, when the illuminating device is placed on the top of the house, for example, if the brightness is uneven, the effect of the person in the room feeling good brightness can be exerted. In addition, the illuminance of the inner peripheral portion of the house where the light is irradiated is moderately maintained, and sufficient illuminance can be obtained directly below the normal direction of the illuminating device, particularly as an illuminating device in the house. Brightness Αι, A A2, and brightness B are better for edge-lit illumination devices satisfying the following equations (3) and (4). Equation (3) : 1,4χΑι ^ Β ^ 2.5χΑ! Equation (4) : 1.4χΑ2 ^ Β ^ 2.5χΑ2 For brightness Β is for brightness Α, or brightness person 2 is less than 1.2 times, see the lighting The brightness perceived by the person of the device, or the illuminance directly below the normal direction of the illumination device, is not sufficient. On the other hand, for the case where the brightness B is more than 3.0 times for the brightness A or the brightness VIII, for example, the illuminance of the inner peripheral portion of the house when the illuminating device is used indoors is -10-201100723 insufficient. The light emitted from the light source 2A is incident into the light guide plate 1 from the side end surface of the light guide plate 1. Further, when the incident light is repeatedly reflected in the light guide plate 1, the incident light is scattered in the disordered portion 10, and then emitted from the light-emitting surface of the light guide plate 1. In addition, a part of the light in the light guide plate 1 is disposed to prevent light from being emitted between the disordered portion 1 or the disordered portion 10, reflects the light, and is incident on the light guide plate 1 again, and is provided with the reflective film 3 (Fig. 1 or even Figure 3). π The above-mentioned chaotic reflection portion 10 is formed in a dot shape or a stripe shape which is formed in a slightly round shape, a slight dot shape, a slightly four-corner shape, or the like, and a dot shape is preferable. In addition, as a method of forming the disordered portion, for example, a method of meshing the surface of the light guide plate 1 or a method of applying a specific wedge type, a method of screen printing or vapor deposition of a specific ink or the like may be mentioned. Among these, it is preferable to form by screen printing. As the ink, a conventionally known structure can be used, and examples thereof include titanium oxide fine particles, cerium oxide fine particles, acrylic beads, and a vapor-curing type containing fine particles Q for randomly reflecting light such as fine hollow particles. Ink or UV-curable inks, etc. The screen printing is carried out at around room temperature, and after drying the above-mentioned ink on the light guide plate, drying is carried out at a room temperature of about -80 °C. It is preferable that the slanting reflection portion 1 is formed such that the illuminance and the like are separated from the side surface side on which the light source 2A is disposed, and the dot density is increased. As a method of forming the dot density, the method of (1) the pitch of the dots (the distance between the centers) is constant, and the distance between the dots is increased from the side surface side where the light source 2A is disposed, and the dot area is raised. Or (2) the point area is made constant, and the distance from the side surface side where the light source 2A is disposed is away from the short distance of the shrinkage - 201100723. Further, in the case where the dot-shaped disordered portion is formed, the dot area is usually 0.3 to 2.0 mm 2 , and is preferably. The pitch of the dots is usually 0.5 to 3.0 mm, and is ideally i.〇~2.0 mni. The density of dots per unit area, that is, the dot occupancy density is usually 10 to 60% ' and desirably 20 to 55%. Further, the point-like random reflection portions may be arranged in parallel in the longitudinal direction and the lateral direction of the light guide plate 1, and may be arranged in a part of the offset. Further, when the center of a point adjacent to the point is connected from the center of an arbitrary one point, it is more preferable to arrange it in an equilateral triangle. In the edge illumination type illumination device of the present invention, as described above, the luminance B is a requirement for satisfying the above (1) and (2) for the luminance 或 or the luminance Az. The relevant elements are provided by appropriately adjusting the pattern forming of the above-described chaotic reflection portion. Specifically, the dot-like or stripe-shaped irregular reflection portion is formed on the light guide plate 1' to actually assemble the edge illumination type illumination device, and the evaluation is performed. If the above formulas (1) and (2) are not satisfied, the size adjustment disorder is performed. The density of the reflectors 'reassembled the device and evaluated. By repeating such operations, an edge illumination type illumination device that satisfies the above formulas (1) and (2) is produced. For example, when the irregular reflection portion is formed in a dot shape, the dot density is increased as it goes away from the side surface side where the light source 2A is disposed, and the pattern is further via (A) the brightness. B is a case where the brightness Ai or the brightness A2 is less than 1.2 times, the dot density near the side end side of the light source is reduced, and the dot density at which the dot density is the highest is increased, -12- 201100723 (B) The brightness B is a point density in which the dot density on the side end side of the light source is increased and the dot density is the highest in the case where the brightness A! or the brightness A2 is more than 3.0 times. For the dot density, an edge illumination device that satisfies the above formulas (1) and (2) is produced. In the present invention, in order to favorably transmit the light emitted from the light source 2A to the light guide plate 1, as shown in FIG. 1 to FIG. 3, it is preferable to arrange the reflective film 3 in the vicinity of the β light source 2A, and more preferably in the light source 2A. The neodymium reflector 4 is preferred. The reflector 4 is disposed in the vicinity of the light source 2A, on the opposite side of the reflective film 3 (Fig. 1 to Fig. 3), and can be disposed behind the LED light source 2 (in the opposite direction to the light guide plate 1). As the reflector 4, for example, a reflector similar to the above-mentioned reflective film can be used, and the thickness thereof is usually about 50 to 40 〇 βιη. Further, as shown in Fig. 2, in the case where the light source 2 is disposed on one side end surface side of the light guide, it is preferable to attach a reflective film to the side end surface side of the side end surface Q on which the light source 2 is disposed. The reflective film is made of the same material as the reflective film described above. Further, it is preferable to attach the above-mentioned reverse film to the other side end surface ′ where the light source 2 is not disposed on the board 1. Further, as shown in Fig. 1 to Fig. 3, each member such as the light guide plate and the light source reflection film 3 is usually housed in a frame made of metal such as aluminum. However, 稜鏡 (not shown) may be disposed on the outer side of the light diffusing plate. For the purpose of the present invention, the adjustment of the present invention can be carried out in the vicinity of the material plate 1 to the opposite side of the material plate 1 to the light guide film 2, and the body 5 piece 13-201100723 [Embodiment] Hereinafter, the implementation of the present invention is shown. Examples and comparative examples, but the present invention is not limited thereto. However, the edge illumination type illumination devices of the examples and the comparative examples were evaluated by the following test methods. (1) Measurement of brightness The edge-illuminated illumination device was placed at the center of the top of a box-shaped black chamber having a width of 2 m, a depth of 2 m, and a height of 2 m. At the top, the reflectivity of the wall (85° reflectance) is taken as 0%. In addition, the power consumption of the edge-illuminated illuminating device is 64 W, and a measuring camera is installed at a position where the illumination emitting surface is 500 mm apart from the normal direction of the surface, and "E.ye" manufactured by Japan Issys Co., Ltd. is used. Scaled" measures the brightness at a specific position as described below. (A) From the side where the light-diffusing sheet on the light source side is disposed, the luminance at a position spaced apart from the longitudinal direction of the light-diffusing sheet by 20 mm is taken as A. (B) The brightness at a position spaced apart from the longitudinal direction of the light diffusing plate by 20 mm from the one side and the opposite side in the longitudinal direction of the light diffusing plate is taken as A2. (C) The brightness of each of the sides (75 mm from each side) described in each of the above (A) and (B) is B. (2) Illumination measurement The edge-illuminated illumination device was placed at the center of the top of a box-shaped white chamber having a width of 3 m, a depth of 3 m, and a height of 2 m. At the top, the reflectivity of the wall (85 ° reflectance) is taken as 30%. In addition, the illuminance of the edge-illuminated illuminating device was measured at a position of 1 1 〇〇 mm directly below the illumination exit surface by using an ANA-F12 illuminometer manufactured by Tokyo Optoelectronics Co., Ltd. as a 64W. (3) The brightness perceived by the person (referred to as "human sensitivity") The observer enters the box-shaped white room to visually observe the edge-illuminated illumination device of the object to be evaluated, and the observer fully feels the brightness ◎ ◎, feel a certain bright situation is 〇, feel that if the dark situation is △, the feeling of darkness is X.实施 Example 1 Comparative Example 1 An edge illumination type illumination device was fabricated using the members shown below. <Mechanism of Edge Illumination Illumination Device> (Light Guide Plate) An isobutylene resin composition ("SUMIPEX E005" manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 5 mm, a length of 150 mm, and a width of 200 mm was used. (Ink for Screen Printing) For the surface (reflecting surface) of the light guiding plate, a dot shape having a substantially round shape was performed by screen printing using the following ink. Volatile hardening type resin ink 7 6.8% by weight Acrylic beads 16.4% by weight Ceria granules 3 · 2% by weight Phosphor 3.6% by weight -15- 201100723 (About dot pattern) The above points are made by the pitch (center distance) The formation is constant as it goes away from the side end side where the light source is disposed, and the dot area thereof becomes high. In addition, the vertical axis is the density (point occupancy density) of the point occupied by the unit area, and the horizontal axis is a graph of the distance from the side end surface side of the light guide plate, and is shown in FIG. 4 (Example 1) and FIG. (Comparative Example 1). Further, 'a diagram showing the positional relationship between an arbitrary point and a point adjacent to the point' is shown in Fig. 60. However, in the first embodiment, the pitch of the dots is taken as ι 73 mm 'minimum diameter system as 〇. 8 3 mm, the maximum diameter is 1 · 3 1 mm ' In Comparative Example 1, the pitch of the dots is taken as 1 · 7 3 mm 'minimum diameter system is 1.04 mm, and the maximum diameter is 1.26 mm. (Light-diffusing sheet) An isobutylene resin composition ("SUMIPEX E5 3 5" manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 2 mm, a length of 150 mm, and a width of 1 200 mm was used. (Light source) As a light source, 24 white LEDs (0.27 W/piece) manufactured by CREE Co., Ltd. were used. In addition, the white LEDs are arranged in a straight line on each of the two side end faces of 5 mm x 200 mm of the light guide plate. -16- 201100723 (Reflective film) On the side of the reflection surface of the light guide plate, an "E60" film (thickness 180#m, vertical 150mmx width 1 208mm) manufactured by TORAY Corporation of Japan was placed. Further, the side surface of the light guide plate to which the light source is not disposed is also attached with the above-mentioned "E60" film (thickness 180#m, 5mmx 15 0mm) Ο (reflector) on the lower side of the light source (light emitting surface) On the side, a "Ε60" film (thickness 180#rn, vertical 14mmx and 1200mm) made by TORAY Corporation of Japan was used as a reflector. The results of Example 1 and Comparative Example 1 are shown in Table 1. [Table 1] Brightness ~ Brightness A2 Brightness B Ατ/Β α2/β Brightness directly below the normal direction (lx) Human sensitivity Example 1 1699 1699 2886 1.69 1 69 1290 ◎ Comparative Example 1 2602 2602 2719 1.04 Τ. 04 1280 △
【圖式簡單說明】 圖1乃模式性地顯示配設光源於導光板之對向的2個 側端面側所成之本發明之邊緣照明型照明裝置之一例的剖 面圖。 圖2乃模式性地顯示配設光源於導光板之1個側端面 側所成之本發明之邊緣照明型照明裝置之一例的剖面圖。 圖3乃模式性地顯示配設光源於導光板之對向的2個 -17- 201100723 側端面側所成之本發明之照明裝置之一例的斜視圖。 圖4乃顯示形成於在實施例1之導光板的反射面之點 狀亂反射部之密度分布[縱軸：點佔有密度（％ )、橫軸： 從配設光源之側端面側的距離（mm )]之一例的圖表。 圖5乃顯示形成於在比較例1之導光板的反射面之點 狀亂反射部之密度分布[縱軸：點佔有密度（％ )、橫軸： 從配設光源之側端面側的距離（mm )]之一例的圖表。 圖6乃顯示任意1個的點，和與該點鄰接的點之位置 關係圖（圖中的數値之單位係mm )。 【主要元件符號說明】 1 :導光板 1 〇 :亂反射部 2A ： LED ,照明BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an example of an edge illumination type illumination device of the present invention which is formed by arranging light sources on opposite side faces of a light guide plate. Fig. 2 is a cross-sectional view schematically showing an example of the edge illumination type illumination device of the present invention in which a light source is disposed on one side end surface side of the light guide plate. Fig. 3 is a perspective view schematically showing an example of the illuminating device of the present invention in which the light source is disposed on the side faces of the two -17-201100723 side faces of the light guide plate. 4 is a view showing the density distribution of the dot-like reflecting portion formed on the reflecting surface of the light guiding plate of the first embodiment [vertical axis: dot occupied density (%), and horizontal axis: distance from the side end side where the light source is disposed ( Mm )] A chart of one example. Fig. 5 is a view showing the density distribution of the dot-like scattering portion formed on the reflecting surface of the light guiding plate of Comparative Example 1 [vertical axis: dot occupied density (%), horizontal axis: distance from the side end side where the light source is disposed ( Mm )] A chart of one example. Fig. 6 is a view showing a positional relationship between any one of the points and a point adjacent to the point (the unit of the number in the figure is mm). [Description of main component symbols] 1 : Light guide plate 1 〇 : chaotic reflection part 2A : LED , illumination
2 B : L E D 陣歹 IJ 3 :反射薄膜 4 :反射器 5 :鋁製的框體 6 :光擴散板 7 :邊緣照明型照明裝置 -18-2 B : L E D 歹 IJ 3 : reflective film 4 : reflector 5 : frame made of aluminum 6 : light diffuser 7 : edge-lit illuminator -18-