TWI320121B

TWI320121B - Light guide for planar light source device, method of manufacturing the same, and cutting tool for use therein

Info

Publication number: TWI320121B
Application number: TW094133492A
Authority: TW
Inventors: Yoshiaki Murayama; Atsushi Saiki; Tomoyoshi Yamashita
Priority date: 2004-10-08
Filing date: 2005-09-27
Publication date: 2010-02-01
Also published as: TW200617534A; KR20060052090A

Description

1320121 九、發明說明：【發明所屬之技術領域】1320121 IX. Description of invention: [Technical field to which the invention belongs]

本發明是有關於一種端面照光方式之面光源裝置中所使用之導光體及其製造方法。本發明特別是有關於一種以形成與一次光源對向之導光體光入射端面的切削加工為特徵的面光源裝置用導光體之製造方法以及其切削加工中所使用的切削工具。又，本發明特別是有關於實現降低亮斑等光學不良能見度之面光源裝置中所使用的導光體。使用有本發明之導光體之面光源裝置，較好的是用於：例如，作為可攜式筆記型電腦等之監視器或液晶電視或視頻一體化液晶電視等顯示部而使用之液晶顯示裝置的背光，或，作為行動電話等可攜式電子機器之顯示器面板，各種機器之指示器而使用的較小型液晶顯示裝置之背光，或，作為車站或公共設施等引路板或看板而使用之液 B曰γ員示裝置的责光，或，作為高速公路或一般道路之交通標識等標示裝置而使用之液晶顯示裝置的背光。【先前技術】龄^年來，液晶顯示裝置，其作為可攜式筆記型電腦等 ^視器’或液晶電視、視頻—體型液晶電視、行動電話及 ^持終端機等之顯神而使用，進而可於其他各種領域中 ^使用。又’伴隨資訊處理量之增大化、需求多樣化、對鱗’液晶顯示裝置之大畫面化、化正日盈發展。液曰曰顯不裝置’基本上含有背光部及液晶顯示元件 1320121 4自液顯示裝置精簡化之觀點考照光方式者作以㈣ > / ^用端面示元件部之;1 用該方式者中，液晶顯二=出射面)與液晶顯示元件部之背面對向，= 少一個側端面(光入射端面)對向二 ^而配置有直f型#紐#線狀或雜之導二二次r所發出之光自導光體之光入射二向先體内。p，並使其自光出射面射出。作為麵照光枝面統裝置之導総錢 ::等成形法而將丙烯系樹脂等透光性合賴脂:形為 =^=:由射出成形所獲得之半成品中，因其端部附者有洗Π或〜道’成形加工後為使其成為具有所尺寸及形狀之導光體，故而切除該等之不必要部分。然而，上述端面照光方式面光源裝置之導光體中，自 -次光源射出併人射至導光體之光人射端面且導向導内之光，其於該導光體内之分佈對自光出射面射出之光之分佈有較大影響。導光體内之光的分佈亦受到光入端面之特性之影響。因此’先前，為於全財可能麟特性均— 性較高之光入射端面，於切除上述不必要部分後，進行去除澆口切割痕等端面切削加工。該端面切削加工，其使用例如如日本專利特門 2001-260075號公報（專利文獻丨）中所揭示之裝置。該^ 面切割裝置中，將具有尺寸大於導光體之被加卫端面部之厚度的鑽;S切肖彳1具HJ定於刀架，使劾架沿著導光體之 1320121 主，之兩面移動，並根據所需之切入量重複均糟此’可於短時間内加工成提高表面特性然而’近年來，對於背光之光學古， =於與液晶顯示元件之有效顯示區域相對應：二 =其於有效發光區域内具有較高之亮度均進而，易出極低f極高之區域’則其過於顯眼而容度區域。乂好的是盡力抑制產生如此之局部低/高亮列舉局部低/南免度區域之原因的具體例，可佈不C〜面自—次光源導入至導光體内之光的分 =二ί:局部低/高亮度區域之-種形態，可列舉 ===中’沿光入射端面™ 面射=„方式面光源裝置+ ’自導光體之光出射形:佈的峰值(峰值光)’-般其與該光出射面 =如=40度之較小角度(即，其與光出射面之法至⑽度之鼓角度），且為使如此之分佈峰值接近於光出射面之法線方向，而稜鏡片配設於導光體光出射面上。然而，於通過光神妒士面欠光源而導入至導光體内之光的分佈不均-方月形時’無法忽視幾乎不受藉由上述稜鏡片之光角度而傾斜=====與導光體出射面法線成* 9 產生如上述般之明帶及暗帶及斜光之問題，隨著導光體薄型化（例如2至3mm左右）之發展而日趨顯著。又，近年來，於液晶顯示裝置中，要求盡可能提高相對於其外形尺寸之顯示晝面尺寸之比率，並提高顯示效率。因此，對於面光源裝置，亦要求盡可能提高相對於其外形尺寸之發光面尺寸之比率，即，要求盡可能減小存在於發光面四周之框狀之構造部分（亦稱為「邊緣」）之尺寸。另一方面，於面光源裝置中，亦要求其薄型化，且為了適應該要求導光體必須薄型化。於端面照光方式面光源裝置中，自一次光源而入射至導光體的光入射端面之光，其一部分相對於光出射面或背面，以大於全反射臨界角之入射角射入，而藉由内面全反射引導，另一部分以小於全反射臨界角小之角度入射至光出射面，其一部分自光出射面射出。隨著導光體之薄型化（例如厚度為〇 5麵至3 mm 程度）’自-次光源發出之光於導光體之光出射面的光入射端面附近區域射出之情形時’根據光人射端面之距離而週期性出現高亮度部分（亮線或明帶）及低亮度部分（暗線或暗帶）°該現象於邊緣寬度較大之情形時實際上並未成為題’但於如上述之邊緣寬度小之面光源裝置中，易於發現藉由該影響而產生之亮斑則特別成為問題。於如此之光入射端面附近產生亮斑，其原因在於通過導光體的光人射端面自-次光源導人至導光體内的光分佈不均一。作為該光分佈不均一之原因之一，可列舉導光體光入射端面之形態如何。因此，作為防止產生如上述之亮 1320121 斑之方法，例如於日本專利特開2000-214334號公報（專 =文獻2)中揭示有：使光入射端面與光出射面形成角度 :例如^於等於93度之鈍角，並使光入射端面與作為與導的體之光出射面相反側主面的背面所形成之角度為例如 •4233度。又，例如於日本專利特開平1〇 319339號公報 ^專利文獻3)中揭示有：使光人射端面與光出射面所形 f之角度與光入射端面與背面所形成之角度相等，並使該 •角度為例如大於等於8〇度、小於等於90度。又，例如^ 曰本專利特開平7_198956號公報（專利文獻4)中揭示有、: 於導光體背面之光入射端面之附近區域，作為防止一次光源射入之方法’形成傾斜之逆傾斜部，其隨著與光入射端面距離之加大而增加導光體厚度。，而，於如上述之光入射端面附近產生亮斑，其與光 $射端面之表面特性有關。因此，作為防止產生如上述之冗斑之方法，例如於日本專利特開平916〇〇35號公報[專利=3253〇〇1號公報](專利文獻5)巾揭示有：將與光入射端面之光出射面平行之方向的算術平均粗縫度Ra設為〇.05至Ο.3 μΐη。又，例如於日本專利特開2001-83512號公報（專利文獻6)中揭示有：將光入射端面之算術平均粗縫度Ra設為〇.G5至（)加，且根據導光體厚度方向之粗糙度程度而加粗與光出射面平行之方向的粗糙度程度。又，例如於曰本專利特開2002-324424號公報（專利文獻 7)中揭示有：將光人射端面之最大高度Ry設為3至5μιη，平均粗链度Ra設為大於等於〇3、小於等於〇 6，因此， 11 工32〇121 使光入射端面係含有例如梨地面而成者。進而，例如於日本專利特開2000-306410號公報（專利文獻8)中揭示有：將沿者與光出射端面平行方向而形成之頂角為16〇至175 度之稜鏡形成於光入射端面上。 [發明所欲解決之問題] 上述之端面切削裝置及使用其之切削方法，對於如上述之明帶及暗帶之產生及斜光之產生未進行充分處理，因此無法說其已充分提高面光源裝置之品位。經切削加工之合成樹脂製導光體之光入射端面，微觀鲁上其具有藉由作為切削加工工具之鑽石切削工具等切削工具而引起之劃痕，或藉由切削工具與合成樹脂摩擦生熱而使合成樹脂部分熔融進而產生之細微凹凸等細微構造。本發明者，就藉由如此切削加工之導光體光入射端面特性與導光體之光學性能之間的關係進行了研究。其結果發現，於製造導光體時’藉由光入射端面之切削加工之條件，特別作為切削工具所使用之工具的形態特徵，上述產生明帶及暗帶之產生及斜光之產生的狀況發生改變。即，發現藉鲁由適當設定切削加工條件，可充分抑制明帶及暗帶之產生及斜光之產生，並得出本發明。又’若根據上述專利文獻5至專利文獻8之方法，藉由使光入射端面之表面特性為特定者，可減少光入射端面附近之亮斑。然而’伴隨於邊緣寬度較小之面光源裝置中之導光體薄型化之問題’亦存於上述情況之外。即，一次光源所發 12 1320121 出之光於作為導光體之光入射端面與光出射端面之分界的導光體邊緣線中’藉由產生作為二次光源的作用而具有影響，於光入射端面附近，自面光源裝置之發光面相對於其法線方向傾斜之斜方向上，進行特別強之光出射（產生斜光），且於其作為液晶顯示裝置之背光而使用之情形時，則使顯示圖像之品位降低。上述專利文獻5至8之方法中，無法充分抑制如此之現象。又，上述專利文獻4之方法，其僅對體積區域上使光散射之光散射型導光體有效。又，僅於上述專利文獻2或 3之方法中，其無法充分處理一次光源之射入等亮斑之產生及斜光之產生之兩方面。【發明内容】目的在於提供一種面光源裝置及使用於該面 ^源裝置之導光體’其難以發現伴隨導光體薄型化而於導 ===近區域中產生之亮斑’且於光入射端* 端面!為解虹毅雜_者，係提供一種自”裝置用導光體之製造方法，其特徵脉’山引導自一二人光源發出之光且具有使來自上述一次光出射面面及使經過引導之光射出的光光體之㈣，成樹脂構成的材料作為上述導角為小於等於8度之切削工具的切削加工 13 1320121 而完成上述光入射端面。又，本發明作為解決上述技術性問題者，係提供一種 =巧，其概在於，其係於製造端面照光方式面光源裝置用導光體時使用於上述光入射端面之切削加工中者，該端面照光方式面光源裝置用導光體引導自一次光源發出具ί使來自—次光源發出之光射入的光人射端面及 ^過引導之光射出的光出射面、且由透光性合成樹脂所隙角為大於等於3度、小於等於45 角為小於等於8度。等;態樣中，上述切削工具之傾斜角為大於 =f。於本發明之-態樣中，上述切削工具前端之曲 ^徑為大轉於U _、小於等於6㈣於本發明之一二，上肋削工具係使崎結多晶鑽石粒子作為固定 :磨拉。於本發明之—態樣中，上述燒結多晶鑽石其平均粒徑為大於等於0.3卿、小於等於3〇帅。進而，本發明作為解決上述技術性問題者，係提供一 ’其W ’引導自一次光源發出 ίίΐΓ 述—次光源發出之光射人的光入射端面及使經過引導之光射出的光出射面及其反面側之背面，且上述光人射端面與上述f面所形成之於89.4度、小於等於91度。料上述光入射端面，根據超深度形狀測定得之上述導級之厚度方向之平均傾勒大 j = 3度、小於等於12度。勺八於等於 1320121 於本發明之-態樣中，上述光入射端面，存於根據超深度形狀測定顯微鏡之測量所得之傾斜角之度數分佈中的傾斜角為大於等於20度之成分比率為小於等於4〇%。於本發明之-態樣中’上述光入射端面，係根據超深度形狀測定顯微鏡之測量所得之上述導光體之厚度方向的中心線平均粗糙度Ra為大於等於〇 2 μιη、小於等於〇 4 μιη。於本發明之-樣中，上述光入射端面，根據超深度形狀測鲁定顯微鏡之測量所得之上述導光體之厚度方向的十點平均粗糙度Rz為大於等於0.7 μιη、小於等於2 μπι。於本發明之一態樣中，上述光入射端面為粗糙面、具備有與上述導光體之厚度方向垂直之方向相互平行並延伸之複數個透鏡列且其剖面形狀中含有曲線之透鏡列形成面或具備有與上述導光體之厚度方向垂直之方向相互平行並延伸之複數個透鏡列且使該透鏡列之至少一部分為粗糖面而成之粗面化的透鏡列形成面。於本發明之一態樣中，上述光出射面由粗糙面所構成。於本發明之一態樣中，上述背面為具備有與上述光入射端面大致垂直之方向相互平行並延伸之複數個透鏡列的透鏡列形成面。 [發明之效果] 若根據如上之本發明，易於獲得光輸入端面形狀之導光體，該導光體藉由使用有間隙角為大於等於3度、小於等於4.5度且傾斜角為小於等於8度之切削工具的切削加工，而完成含有透光性合成樹脂之導光體之光入射端面，可形成充分抑制明帶及暗帶之產生及斜光之產生的面光源 15 1320121 裝置。又，若根據如上之本㈣，使光场端面與背面所成之角為大於等於89.4度、小於等於91度，並使*入射端面之導光體厚度方向之平斜角纽為大於#於3度、小於等於12度，藉此於面光裝置中，難以發薄型化而於導光體光人射端面附近領域出現之^導且可減少光入射端面附之斜光的產生。 ▲為讓本發明之上述和其他目的、特徵和優點能更明顯易f董，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下。 ^ 【實施方式】以下，參照圖式就本發明之實施形態加以說明。圖1係用以說明本發明中之面光源裝置用導光體之製造方法之實施中所使用的端面切削加工装置之一實施形態的模式結構圖，圖2係其立體模式圖。此處，亦揭示有本發明中之切削加工用切削工具之一實施形態。於該等圖中，符號2表示作為被加工物之板狀導光體。導光體2含有透光性合成樹脂板，並係用以構成液晶顯示裝置用之端面照光方式背光者。導光體2，其具有2 個主面2a、2b及與該等主面之外表面邊緣相鄰接之端面 2c、2d、2e、2f。主面2a作為光出射面而使用，端面2c 作為光入射端面而使用。導光體2藉由設於未圖示之加工裝置本體的未圖示之保持機構而定位於所需之位置，並大致保持為水平方向（即，以主面2a，2b位於與XY面大致 1320121 為平行之面内之方式）。端面2c係被加工端面，並平行位於XZ面内。透光性合成樹脂板只要係可進行切削加工者’對材質無特別限制，詳細情況以下加以敍述，例如其由丙稀系樹脂、聚碳酸酯系樹脂或環狀聚烯烴系樹脂所構成。於加工裝置本體上固定有背板4。於該背板上安裝有延伸於Y方向之導軌6，並安裝有刀架支持部8，該刀架支，部8藉由該導軌引導並可於γ方向上來回移動。於上述背板4上安裝有可正反旋轉之伺服馬達如，其旋轉力由捲繞於輸出旋轉軸之皮帶4而傳達至2根分別延伸於^ 方向之螺桿轴4c。另一方面，於刀架支持部8上安穿與形成於上述螺桿軸之公螺桿相扣合而形成的母 ^ 螺桿部件8a。因此，可藉由驅動祠服馬達如並使而使刀架支持部8沿Y方向向所希望之位並^ ’ 於刀架支持部8上，安裝有可正反旋轉 ^ 处’其旋轉力傳至滾珠螺桿轴8(：。藉由刀^服馬^ 支持刀架1〇向以向移動。即，於骑The present invention relates to a light guide body used in a surface light source device of an end face illumination method and a method of manufacturing the same. In particular, the present invention relates to a method of manufacturing a light guide for a surface light source device which is characterized in that a cutting process for forming a light incident surface of a light guide opposite to a primary light source, and a cutting tool used for the cutting process. Further, the present invention is particularly directed to a light guide body used in a surface light source device that achieves reduction in optical defect visibility such as bright spots. The surface light source device having the light guide body of the present invention is preferably used for, for example, a liquid crystal display used as a monitor of a portable notebook computer or a display unit such as a liquid crystal television or a video integrated liquid crystal television. The backlight of the device, or the display panel of a portable electronic device such as a mobile phone, the backlight of a smaller liquid crystal display device used for indicators of various machines, or used as a guide or billboard for a station or public facility. The backlight of the liquid 显示员员员员员 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , [Prior Art] In the age of the year, the liquid crystal display device is used as a portable notebook computer or the like, or a liquid crystal television, a video-type LCD TV, a mobile phone, and a terminal device. Can be used in various other fields. In addition, with the increase in the amount of information processing, the diversification of demand, and the large-screen display of the scale-based liquid crystal display device, the company is developing. The liquid helium display device basically includes a backlight portion and a liquid crystal display element 1320121. The liquid crystal display device is simplified from the viewpoint of the light mode. (4) > / ^ uses the end face to indicate the component portion; , the liquid crystal display 2 = the exit surface) and the back side of the liquid crystal display element portion, = one side end surface (light incident end surface) is opposite to the opposite side and is arranged with a straight f type #纽# linear or miscellaneous guide two times The light emitted by r is incident on the light source from the light guide body. p, and emit it from the light exit surface. As a guide for the face-lighting device, the light-transmissive lyophilized resin such as a propylene-based resin is formed by a molding method: the shape is =^=: in the semi-finished product obtained by injection molding, because the end is attached There is a wash or a 'way' to form a light guide having a size and shape after the forming process, so that unnecessary portions are cut off. However, in the light guide body of the above-described end face illumination type surface light source device, the self-primary light source is emitted and incident on the light human end face of the light guide body and the light in the guide light is distributed in the light guide body. The distribution of the light emitted from the light exit surface has a large influence. The distribution of light in the light guide is also affected by the characteristics of the light entering the end face. Therefore, in the past, in order to remove the above-mentioned unnecessary portion, the end face cutting process such as the gate cutting mark is performed. This end face cutting process uses, for example, a device disclosed in Japanese Patent Publication No. 2001-260075 (Patent Document No.). In the surface cutting device, the drill having a thickness larger than the thickness of the reinforced end face of the light guide body; the S-cut 彳 1 HJ is fixed to the tool holder, so that the truss is along the light guide body 1320121, The two sides move and repeat the same according to the required cutting amount. This can be processed in a short time to improve the surface characteristics. However, in recent years, for the optical backlight of the backlight, it corresponds to the effective display area of the liquid crystal display element: = It has a high brightness in the effective light-emitting area, and then the area that is extremely low and extremely high, is too conspicuous and tolerant. The best example is to try to suppress the cause of such local low/high-light enumeration of the local low/south-free area, and the light that can be introduced into the light-guide body from the C-plane is not divided into two. ί: The form of the local low/high brightness area, which can be listed as === in the 'light incident end face TM plane = „ mode surface light source device + 'self-light guide light exit shape: cloth peak (peak light) '--the same as the light exit surface = such as = 40 degrees of the smaller angle (ie, its light exit surface to the drum angle of (10) degrees), and so that the distribution peak is close to the light exit surface The normal direction, and the cymbal is disposed on the light-emitting surface of the light guide. However, the uneven distribution of light introduced into the light guide body through the light source of the light gods is not negligible. It is hardly inclined by the light angle of the above-mentioned cymbal ===== and the normal to the light-emitting surface of the light guide is *9 to produce the problem of the bright band and the dark band and the oblique light as described above, with the light guide thin The development of (for example, about 2 to 3 mm) is becoming more and more remarkable. In recent years, in liquid crystal display devices, it is required to increase the phase as much as possible. For the display of the dimensions of the dimensions of the dimensions, and to improve the display efficiency. Therefore, for the surface light source device, it is also required to increase the ratio of the size of the light-emitting surface relative to its outer dimensions as much as possible, that is, to minimize the existence of The size of the frame-like structure (also known as the "edge") around the light-emitting surface. On the other hand, in the surface light source device, it is also required to be thinned, and in order to meet the demand, the light guide body must be made thinner. In the end-illuminated surface light source device, light incident on the light incident end surface of the light guide from the primary light source is partially incident on the light exit surface or the back surface at an incident angle greater than a critical angle of total reflection. The inner surface is totally reflected and the other portion is incident on the light exit surface at an angle smaller than the critical angle of total reflection, and a part thereof is emitted from the light exit surface. With the thinning of the light guide body (for example, the thickness is 〇5 to 3 mm), the light emitted from the self-primary light source is emitted from the vicinity of the light incident end face of the light exit surface of the light guide body. The high-luminance part (bright line or bright band) and the low-brightness part (dark line or dark band) appear periodically at the distance of the end face. This phenomenon does not actually become a problem when the edge width is large. In a surface light source device having a small edge width, it is easy to find a bright spot generated by the influence, which is particularly problematic. Bright spots are generated in the vicinity of the incident end face of such light, because the light distribution through the light-emitting end face of the light guide body from the secondary light source to the light guide body is not uniform. One of the causes of the unevenness of the light distribution is the form of the light incident end surface of the light guide. Therefore, as a method of preventing the occurrence of the glare 1320121 plaque as described above, for example, Japanese Patent Laid-Open Publication No. 2000-214334 (Special Document 2) discloses that the light incident end face is formed at an angle with the light exit surface: for example, An obtuse angle of 93 degrees and an angle formed by the light incident end surface and the back surface of the main surface opposite to the light exit surface of the guided body are, for example, 4233 degrees. Further, for example, Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. The angle is, for example, greater than or equal to 8 degrees and less than or equal to 90 degrees. In the vicinity of the light incident end surface on the back surface of the light guide body, as a method of preventing the primary light source from entering, the reverse slope portion of the inclination is formed, as disclosed in Japanese Laid-Open Patent Publication No. Hei 7-198956 (Patent Document 4). It increases the thickness of the light guide as the distance from the incident end face of the light increases. Further, a bright spot is generated in the vicinity of the light incident end surface as described above, which is related to the surface characteristics of the light-emitting end face. Therefore, as a method of preventing the occurrence of the above-mentioned smear, for example, Japanese Patent Laid-Open Publication No. Hei No. 916-35 (Patent Document No. 3 253 〇〇 1) (Patent Document 5) discloses that the light is incident on the end surface. The arithmetic mean roughness Ra of the direction in which the light exit faces are parallel is set to 〇.05 to Ο.3 μΐη. Further, for example, Japanese Laid-Open Patent Publication No. 2001-83512 (Patent Document 6) discloses that the arithmetic mean rough degree Ra of the light incident end face is set to 〇.G5 to () plus, and according to the thickness direction of the light guide body. The degree of roughness increases the degree of roughness in the direction parallel to the light exit surface. Further, for example, Japanese Laid-Open Patent Publication No. 2002-324424 (Patent Document 7) discloses that the maximum height Ry of the light-emitting end face is set to 3 to 5 μm, and the average thick-chain degree Ra is set to be equal to or greater than 〇3. It is less than or equal to 〇6, so 11 workers 32〇121 make the light incident end face contain, for example, a pear floor. Further, for example, Japanese Laid-Open Patent Publication No. 2000-306410 (Patent Document 8) discloses that the apex angle formed by the direction parallel to the light exit end face is 16 〇 to 175 °, and is formed on the light incident end face. on. [Problems to be Solved by the Invention] The above-described end face cutting device and the cutting method using the same do not sufficiently treat the occurrence of the above-described bright and dark bands and the occurrence of oblique light, and therefore it cannot be said that the surface light source device has been sufficiently improved. The taste. The light-incident end surface of the synthetic resin light guide body which has been subjected to the cutting process has a scratch caused by a cutting tool such as a diamond cutting tool as a cutting tool or a frictional heat generated by a cutting tool and a synthetic resin The microstructure is partially melted to produce a fine structure such as fine unevenness. The inventors of the present invention have studied the relationship between the light incident end surface characteristics of the light guide body and the optical performance of the light guide body. As a result, it has been found that the condition of the cutting process by the light incident end face during the manufacture of the light guide body, particularly as the morphological feature of the tool used in the cutting tool, causes the occurrence of the occurrence of the bright band and the dark band and the occurrence of the oblique light. change. Namely, it has been found that by appropriately setting the cutting processing conditions, the generation of the bright and dark bands and the generation of the oblique light can be sufficiently suppressed, and the present invention can be obtained. Further, according to the methods of Patent Document 5 to Patent Document 8, the surface characteristics of the light incident end surface are made specific, and the bright spots near the light incident end surface can be reduced. However, the problem of thinning of the light guide body in the surface light source device having a small edge width is also present in the above case. That is, the light emitted by the primary light source 12 1320121 is in the edge line of the light guide body which is the boundary between the light incident end surface and the light exit end surface of the light guide body, and has an influence by the action of generating the secondary light source. In the vicinity of the end face, when the light-emitting surface of the surface light source device is inclined obliquely with respect to the normal direction thereof, particularly strong light is emitted (inclination is generated), and when it is used as a backlight of the liquid crystal display device, the display is performed. The quality of the image is reduced. In the methods of the above Patent Documents 5 to 8, such a phenomenon cannot be sufficiently suppressed. Further, the method of Patent Document 4 described above is effective only for a light-scattering light guide that scatters light in a volume region. Further, in the method of Patent Document 2 or 3, it is not possible to sufficiently handle both the generation of bright spots such as the entrance of the light source and the generation of oblique light. SUMMARY OF THE INVENTION It is an object of the invention to provide a surface light source device and a light guide body used in the surface source device, which are difficult to find a bright spot generated in a near region with a lighter thickness of the light guide body. The incident end* end face! is a method for manufacturing a light guide body for the device, and the characteristic pulse 'mountain guides the light emitted from the light source of one or two people and has the surface of the light emitted from the first light and (4) A material made of a light-emitting body that has been guided by the light is formed as a material of the cutting tool 13 1320121 in which the lead angle is 8 degrees or less. The light incident end surface is completed. The problem of the problem is that it is used in the cutting of the light incident end face when manufacturing the light guide for the surface light source device of the end face illumination method, and the guide for the face light source device is used. The light body is guided from the primary light source to emit a light emitting surface that emits light from the secondary light source and emits light, and the light emitting surface is emitted by the light transmitting synthetic tree. The gap angle of the grease is 3 degrees or more, 45 degrees or less is 8 degrees or less. In the aspect, the inclination angle of the cutting tool is greater than = f. In the aspect of the invention, the cutting tool front end The curvature of the curve is greater than U _, less than or equal to 6 (four). In the second aspect of the present invention, the upper rib cutting tool is used to fix the stellate polycrystalline diamond particles as: fixed. In the aspect of the present invention, the above sintering The polycrystalline diamond has an average particle diameter of 0.3 or more and 3 or less. Further, as a solution to the above technical problem, the present invention provides a 'W' guide from a primary light source. The light incident end surface of the light person and the light exit surface of the guided light and the back surface side thereof are formed, and the light human end surface and the f surface are formed at 89.4 degrees or less and 91 degrees or less. The incident end face has an average inclination of the thickness direction of the above-mentioned guide step measured by the ultra-depth shape, j = 3 degrees, and less than or equal to 12 degrees. The spoon eight is equal to 1320121. In the aspect of the invention, the light incident end face, Deposited according to The ratio of the inclination angle in the power distribution of the inclination angle measured by the depth shape measuring microscope to 20 degrees or more is 4% or less. In the aspect of the invention, the light incident end surface is based on the super depth. The center line average roughness Ra in the thickness direction of the light guide body measured by the shape measuring microscope is 大于2 μηη or more and 〇4 μηη. In the present invention, the light incident end surface is based on the ultra depth. The ten-point average roughness Rz in the thickness direction of the light guide body obtained by the measurement of the shape-determining microscope is 0.7 μm or more and 2 μm or less. In one aspect of the invention, the light incident end surface is a rough surface. a lens array forming surface having a plurality of lens rows extending parallel to a direction perpendicular to a thickness direction of the light guiding body and having a curved surface in a cross-sectional shape or having a direction perpendicular to a thickness direction of the light guiding body a plurality of lens columns parallel and extending, and at least a portion of the lens rows are roughened lens rows Surface. In one aspect of the invention, the light exiting surface is formed by a rough surface. In one aspect of the invention, the back surface is a lens array forming surface having a plurality of lens rows extending in parallel with each other in a direction substantially perpendicular to the light incident end surface. [Effects of the Invention] According to the present invention as described above, it is easy to obtain a light guide body having a shape of a light input end face, which has a gap angle of 3 degrees or more, 4.5 degrees or less, and a tilt angle of 8 or less. In the cutting process of the cutting tool, the light incident end surface of the light guide body containing the light transmissive synthetic resin is completed, and a surface light source 15 1320121 device capable of sufficiently suppressing the generation of the bright band and the dark band and the occurrence of the oblique light can be formed. Further, according to the above (4), the angle between the end face of the light field and the back surface is 89.4 degrees or more and 91 degrees or less, and the flat bevel angle of the thickness direction of the light incident body of the * incident end face is greater than # 3 degrees and 12 degrees or less, in the surface light device, it is difficult to be thinned and formed in the vicinity of the light-emitting body end face and the occurrence of oblique light attached to the light incident end face can be reduced. The above and other objects, features, and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic structural view showing an embodiment of an end face cutting apparatus used in the method of manufacturing a light guide for a surface light source device according to the present invention, and Fig. 2 is a perspective view thereof. Here, an embodiment of the cutting tool for cutting according to the present invention is also disclosed. In the drawings, reference numeral 2 denotes a plate-shaped light guide as a workpiece. The light guide 2 includes a light-transmitting synthetic resin sheet and is used to constitute a backlight for a liquid crystal display device. The light guide body 2 has two main faces 2a, 2b and end faces 2c, 2d, 2e, 2f adjacent to the outer edge of the main faces. The main surface 2a is used as a light exit surface, and the end surface 2c is used as a light incident end surface. The light guide 2 is positioned at a desired position by a holding mechanism (not shown) provided in a main body of the processing apparatus (not shown), and is substantially horizontally positioned (that is, the main surfaces 2a and 2b are located substantially in the XY plane. 1320121 is the way in parallel.) The end face 2c is a machined end face and is positioned parallel to the XZ face. The material of the light-transmissive synthetic resin sheet is not particularly limited as long as it can be subjected to the cutting process, and the details thereof will be described below. For example, it is made of an acrylic resin, a polycarbonate resin or a cyclic polyolefin resin. A backing plate 4 is fixed to the processing device body. A guide rail 6 extending in the Y direction is mounted on the back plate, and a holder support portion 8 is attached, and the holder holder 8 is guided by the guide rail and movable back and forth in the γ direction. A servo motor that can rotate forward and backward is attached to the back plate 4, and the rotational force is transmitted from the belt 4 wound around the output rotary shaft to the two screw shafts 4c extending in the direction of the ^. On the other hand, the female screw member 8a formed by being engaged with the male screw formed on the screw shaft is attached to the holder support portion 8. Therefore, the tool holder support portion 8 can be driven to the desired position in the Y direction by the drive of the motor, and the front and rear rotations can be mounted. Pass to the ball screw shaft 8 (:. With the knife ^ service horse ^ support the knife holder 1 〇 direction to move.

相=之扣合部件1〇a，藉由，S 動並停止。又’雖未圖示，但於位置移以引導刀架10沿X方向移動、遙舳' 加。上安裝有用々问移動之導軌，刀架1 及上述滾珠螺_^於”向平行移動。L者該導軌為提同刀架10之移動精度，較好的相互平行配置而使用。U 將上边兩根導軌稭此，於滾珠螺桿轴8c主要僅具有 17 1320121 驅動刀架之功能，並具有於導勒接疮^ 啕趴等軌上維持刀架10之較高位置精度且抑制騎10驅輯之振動的功能。 ^好^騎狀騎1()解歡_。該間隙較好二，VL1至5 μιη左右。若間隙位於上述範圍之外且 …、:出現刀架10無法驅動之情形。又，若間隙過分大 =上述I聲則出現於刀架1G轉時因移動而產生振動，從而於導光體端面形成作為產生斜光之原因的不規則凹凸圖案。 A於刀架10上，安裝有完成切削刀具12及用以藉由該元成切削刀具而先於切肖彳加工進行之粗加玉之粗切削刀具 14。該等刀具係例如燒結多晶鑽石切削工具，且完成切削刀具12與粗切削刀具14相比可使用較小粒子之鑽石作為固定研磨粒。鑽石切削工具係例如於平均粒徑為0.3至3〇 μιη，較好的是〇‘5至25 μιη，更好的是2至10 μιη之範圍内’將相對於該平均粒徑士 5〇%範圍内之粒徑之鑽石粒子與點合劑共同燒結而得者。燒結多晶鑽石切削工具，其與例如以CVD法等而得者相比，機械性強度較高且粒度分佈更優良。若鑽石粒子之平均粒徑大於30 μιη，則於導光體之光入射端面附近容易出現明帶，若鑽石粒子之平均粒徑小於0.3 μιη，則於導光體之光入射端面附近容易出現暗帶。於刀架10上附設有刀具支持位置交替機構l〇b，該交替機構10b於沿他方向切入移動之移動方向（Y方向）前進之第1位置與後退之第2位置處轉換支持完成切削刀具 12及粗切削刀具14中之一方。該刀具支持位置轉換機構，具體地說，係人如粗切削7J具及第2位置之間可僅支持例 ^之位置轉換，亦可同時僅支持完肋削刀具相互逆向而進行之仿=持雙方之切削切削工具12、14 之位置替換之刀1 Φ f轉作為可僅支持粗切削刀具14 對於刀架1〇以γ、、位置轉換機構l〇b，可列舉例如， 14 ’並藉由空壓機置可變之方式支持粗切削刀具時移動之部件者。；方向驅動與粗切削刀具14同 14之表;^光體2與完成切削刀具12及粗切削刀具切削刀具12及㈣的^式圖。如圖所示，完成 (7 /、4,具有大於導光體2之端面 M(z方向尺寸）的寬度（2方向尺寸），且可度整體14❿對導光體端面2C之寬 4c、動機構含有上述伺服馬達4a、皮帶4b、螺桿軸他、干部件83及刀架支持部8，輸送移動機構由上述视馬達8b、滾珠螺桿轴8c及扣合部件他所構成。祠艮馬達4a、8b及刀具支持位置轉換機構滿藉由控制部 2〇而得以控制。以下，參照圖4及圖5就控制部20之動作加以說明。圖4係藉由刀具支持位置轉換機構1〇b之粗切削刀具 Μ之位置轉換與粗切削加工及完成切削加工的說明圖，圖 5係完成切削刀具12之形態特徵之說明圖。於進行導光體端面2c之粗切削加工時，根據控制部 1320121 刀具支持轉換機構_如® 4 (a)所示，將相成切削刀且^粗切削刀具14之位置沿Y方向轉換至自完態下前進之（即，接近導光體2)第1位置⑴。時序ί據控制部2〇之指令，舰馬達8b以所需之所兩之槲Ϊ订正轉或反轉，繼而，使藉由移送機構根據距離）ί:料體端面&之#由X方向上尺寸之最大同H#，^架1〇上之粗切削刀具14沿X方向來回移動。戶^要之^控制部2〇之指令，與伺服馬達8b同時且根據二f 服馬達&進行重複正轉或反轉，繼而， =刀入移動機構而使刀架1〇上之粗切削刀具14沿¥方 ^且回移動。具體的是，於圖卜圖4及圖5 +，粗切削〃 / /tJ X方向自右向左移動時進行粗切削加工，於X 方向衡程之左端進行反轉時’粗切肖彳姻X具14僅於Y 方^逐步後退（即逐漸遠離導光體），而於X方向衡程之右端進行反轉時，粗切削刀具14沿γ方向以於所需之切 =量（例如10至30 μιη左右）加入上述後退量之距離而刖進。以此方式以所期望之次數（例如5至3〇左右後）進行粗切削加工。於自粗切削加工向完成切削加工轉移時，首先，根據控制部20之指令，刀具支持位置轉換機構1〇b，如圖4(b) 所示，將相對於刀架10之粗切削刀具14之位置沿γ方向轉換為自切削刀具12後退之第2位置（2)。繼而，於該狀瘙下，根據控制部20之指令，伺服馬達4a正轉，繼而，如圖4(c)所示，刀架1〇上之粗切削刀具14藉由切入移 1320121Phase = the snap part 1〇a, by which S moves and stops. Further, although not shown, the position is moved to guide the tool holder 10 to move in the X direction and to move away. The guide rail for moving is attached, and the tool holder 1 and the ball screw are moved in parallel. The guide rails of the L are used to improve the movement accuracy of the tool holder 10, and are preferably arranged in parallel with each other. U will be used above. The two guide rails have the function of driving the tool holder mainly on the ball screw shaft 8c, and have the higher positional accuracy of the tool holder 10 on the rails such as the guide rods and the likes, and suppress the riding of the 10 drive. The function of the vibration. ^Good ^ riding ride 1 () solves the joy _. The gap is better than two, VL1 to 5 μιη. If the gap is outside the above range and ...,: the knife frame 10 can not be driven. Further, if the gap is excessively large, the above-mentioned I sound occurs when the tool holder 1G rotates, and vibration occurs due to the movement, so that an irregular concave-convex pattern which is a cause of oblique light is formed on the end surface of the light guide body. A is mounted on the tool holder 10 There is a cutting tool 12 and a rough cutting tool 14 for roughing the jade by the cutting tool. The tools are, for example, sintered polycrystalline diamond cutting tools, and the cutting tool 12 is completed. Can be used compared to rough cutting tool 14 A small particle of diamond is used as a fixed abrasive. The diamond cutting tool is, for example, having an average particle diameter of 0.3 to 3 μmηη, preferably 〇'5 to 25 μηη, more preferably 2 to 10 μηη. The diamond particles having a particle diameter in the range of 5% by volume of the average particle diameter are sintered together with the spotting agent. The sintered polycrystalline diamond cutting tool has mechanical strength compared with, for example, a CVD method or the like. High and fine particle size distribution. If the average particle diameter of the diamond particles is larger than 30 μm, the bright band is likely to appear near the light incident end face of the light guide body, and if the average particle diameter of the diamond particles is less than 0.3 μm, the light guide body is A dark band is likely to occur in the vicinity of the light incident end face. A tool support position alternate mechanism 10b is attached to the tool holder 10, and the alternate mechanism 10b advances to the first position and the backward position in the moving direction (Y direction) of the cutting direction in the other direction. The second position conversion support completes one of the cutting tool 12 and the rough cutting tool 14. The tool supports a position conversion mechanism, specifically, a person such as a rough cutting 7J and a second position can only support the example For the conversion, it is also possible to support only the reverse of the rib cutting tools. The position of the cutting tools 12 and 14 is replaced by the knives 1 Φ f to support only the rough cutting tool 14 for the tool holder 1 The γ and the position conversion mechanism 100b may, for example, be a member that moves when the rough cutting tool is supported by the air compressor, and the direction is driven by the rough cutting tool 14; ^^光体2 and the finished cutting tool 12 and the rough cutting tool cutting tool 12 and (4) are shown in the figure, completed (7 /, 4, with the end face M larger than the light guide 2 (z direction size) Width (two-direction dimension), and the overall width 14 ❿ to the width 4c of the light guide end face 2C, the moving mechanism includes the servo motor 4a, the belt 4b, the screw shaft, the dry member 83, and the tool holder support portion 8, and the transport movement The mechanism is composed of the above-mentioned sight motor 8b, the ball screw shaft 8c, and the fastening member. The 艮艮 motor 4a, 8b and the tool support position conversion mechanism are controlled by the control unit 2〇. Hereinafter, the operation of the control unit 20 will be described with reference to Figs. 4 and 5 . Fig. 4 is an explanatory view showing the position conversion, rough cutting, and cutting processing of the rough cutting tool by the tool supporting position changing mechanism 1b, and Fig. 5 is an explanatory view showing the morphological characteristics of the cutting tool 12. When the rough cutting of the light guide end face 2c is performed, the position of the forming cutting tool and the rough cutting tool 14 is converted to the Y direction in accordance with the control unit 1320121 tool support switching mechanism_, as shown in Fig. 4 (a). The first position (1) is advanced (ie, close to the light guide 2). According to the instruction of the control unit 2, the ship motor 8b is rotated forward or reversed by the required two, and then by the transfer mechanism according to the distance): the end face of the material body &# is determined by the X direction The upper dimension is the same as the H#, and the coarse cutting tool 14 on the frame 1 is moved back and forth in the X direction. The command of the control unit 2〇 is repeated with the servo motor 8b and the forward/reverse rotation is performed according to the second motor, and then the knife is moved into the moving mechanism to make the rough cutting on the tool holder 1 The cutter 14 moves along the ¥ side and moves back. Specifically, in Fig. 4 and Fig. 5 +, the rough cutting is performed when the rough cutting 〃 / /tJ X direction moves from right to left, and when the left end of the X direction is reversed, the rough cutting is performed. The X tool 14 is only gradually retracted in the Y direction (ie, gradually away from the light guide body), and when the right end of the X direction is reversed, the rough cutting tool 14 is in the γ direction to the desired cutting amount (for example, 10). Add to the distance of 30 μιη) and increase the distance of the above retreat. In this way, the rough cutting process is performed a desired number of times (for example, after about 5 to 3 Torr). When transferring from the rough cutting process to the completion of the cutting process, first, according to the instruction of the control unit 20, the tool supports the position converting mechanism 1b, as shown in FIG. 4(b), the rough cutting tool 14 with respect to the tool holder 10. The position is converted in the γ direction to the second position (2) from which the cutting tool 12 retreats. Then, in this state, the servo motor 4a is rotated forward according to the instruction of the control unit 20, and then, as shown in Fig. 4(c), the rough cutting tool 14 on the tool holder 1 is moved by the cutting 1320121.

Y方气前進。該前進沿Y方向，並僅以略小位於第1位置之粗切削切肖，江具14之前端具12之前端位置之差（該值传一兀成刀月J 的距離而移動。藉此，完成切削加左右） H光體端面2c之完成切削加工之際^據控制部Y square gas advances. The advancement is in the Y direction, and is only slightly smaller than the rough cut at the first position, and the difference between the front end positions of the front end of the ware 14 is shifted (the value is transmitted by the distance of the knives J). , the completion of cutting plus left and right) H light body end face 2c at the time of completion of the cutting process

LΓ服馬達8b以所需之時序重複進行正轉及反 =繼而’ It由輸送移動機構刀· 1〇上之完成切削刀具 A者方向以所需之衡程（大於導光體端面以之又方向之尺寸之距離）而來回移動。同時，根據控制部2〇之指令’與伺服馬達8b同時且健馬達4a以所需之時序而重複進打正轉及反轉，繼而藉由切人移動機構刀架⑴上之完成切削刀具12沿著γ方向而來回移動。具體的是於圖卜圖4圖5中，切削刀具12沿χ方向自右向左移動之時進行兀成切削加工，於X方向衡程之左端而反轉時，完成切削工具12僅沿γ方向後退，而於χ方向衡程之右端而反轉時，切削刀具12沿γ方向以於所需之切入量（例如2 至20 μιη左右）加入上述後退量的距離而前進。如此進行所需次數（例如2至20次左右）之完成切削加工。於完成切削加工之最終階段，較好的是進行數次切入量幾乎為〇 μιη之切削加工。藉此’可獲得穩定且個體不均一較少之良好特性的切削加工面。於該完成切削加工時，可將刀架10沿χ方向之輸送移動速度設為例如50至2000 mm/sec之範圍内之特定速度°又’亦可於50至2000 mm/sec之範圍内使刀架10沿 21 1320121 x方向之輸送移動速度隨切肖彳加工而變化。刀且式中’如圖5所示，作為完成切削 ^之鑽石_工具，_角D1為大於等於3度、小L Γ 马达马达 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 The distance of the dimension of the direction) moves back and forth. At the same time, according to the instruction of the control unit 2', the servo motor 8b is simultaneously and the motor 4a repeats the forward rotation and the reverse rotation at the required timing, and then the cutting tool 12 is completed by cutting the movable mechanism tool holder (1). Move back and forth along the gamma direction. Specifically, in FIG. 4 and FIG. 5, when the cutting tool 12 moves from right to left in the x direction, the cutting process is performed, and when the left end of the X direction is reversed, the cutting tool 12 is completed only along the γ. When the direction is reversed and the right end of the χ direction is reversed, the cutting tool 12 advances in the γ direction by the distance of the required amount of retraction (for example, about 2 to 20 μm). This is done in the required number of times (for example, about 2 to 20 times) to complete the cutting process. In the final stage of the completion of the cutting process, it is preferable to carry out the cutting process in which the cutting amount is almost 〇 μιη. By this, it is possible to obtain a machined surface which is stable and has less uniform characteristics of individuality. When the cutting process is completed, the conveying speed of the tool holder 10 in the weir direction can be set to a specific speed in the range of, for example, 50 to 2000 mm/sec, and can also be made in the range of 50 to 2000 mm/sec. The transport speed of the tool holder 10 along the 21 1320121 x direction varies with the cutting process. In the knives and formulas, as shown in Fig. 5, as the diamond_tool for completing the cutting, the angle D1 is 3 degrees or more and small.

二於:.5度’傾斜角D2為大於等於3度、小於等於8 ，義之曲率半控11為大於等於15吨、小於等於若間隙角IM小於3度則易出現明帶，若間隙角以大於 4.5度則易出現暗帶。又，若傾斜角D2小於3度則易因切 ’’產生毛刺，若傾斜角D2大於8度則易產生斜光。又，若前端之曲率半徑R小於丨.—，則姻面會鏡面化且易產，暗帶’若前端之鲜半徑—，則切削時電阻過高而使切削面粗糙且易產生明帶。Second: .5 degrees 'inclination angle D2 is greater than or equal to 3 degrees, less than or equal to 8, the radius of curvature half control 11 is greater than or equal to 15 tons, less than or equal to the gap angle IM is less than 3 degrees, it is easy to appear bright band, if the clearance angle is More than 4.5 degrees is prone to dark bands. Further, if the inclination angle D2 is less than 3 degrees, burrs are easily generated due to the cut, and if the inclination angle D2 is larger than 8 degrees, oblique light is likely to occur. Further, if the radius of curvature R of the tip end is smaller than 丨.—, the surface of the mask will be mirror-finished and easy to produce, and if the dark band 'has a sharp radius at the tip end, the resistance at the time of cutting is too high, and the cut surface is rough and the bright band is easily generated.

使用以上述方式獲得之導光體，其可形成如圖G所示之端，照光方式面光源裝置。即，以對向於導光體端面（光入射端面）2c之方式配置附有反射罩1〇2之線狀一次光源 10卜並以對向於導光體主面（光出射面）2b之方式配置光反射薄膜105 ’並於導光體光出射面2a上配置棱鏡片 104。再者，作為導光體之一方之主面的光出射面，作為具有指向性光出射功能之褪光面，於其他主面（背面） 2b上形成有相互平行且延伸於與光入射端面&垂直之方向的複數個稜鏡列。又，於與稜鏡片1〇4之導光體光出射面2a對向之下面（入光面）i〇4a中，形成有相互平行且與一次光源101相平行並延伸於X方向之複數個稜鏡列。形成於導光體光出射面2a之槌光面’其自實現特別於 YZ面内所需之指向性光出射，並事先光出射面内之亮度 22 1320121 ^均句度的觀點考慮’較好的是根據IS04287/1-1984使平斜角0a為〇·5至15度之範圍内。平均傾斜角0a更好阌疋為1至12度之範圍’進而好的是為15至u度之範固。褪光面之平均傾斜角如，根據IS04287/1-1984,使用針式粗韃度制定粗㈣雜，制定方向之座標設為 ^使肋下公式⑴及公式⑺自所獲得之傾斜函數 1 (X)中而求出。 △a = (VL)iLl(d/dx)f(x)idx …⑴ = tan'(Aa)- (2) 此處，L為測定之長度，Aa為平均傾斜角如之正切進而’作為導光體2較好的是出射率為〇 5至5%之範圍，更好的是為1至3%之範圍。此是因為，若光出射率 ^於0.5%則自導紐3射出之^量變少且無法獲得足夠之壳度’若光出射率大於5%則於一次光源！附 =出杏：光出射面2a内之χ方向上之出射光之衰減變初:光出射面2a上之亮度之均勻度具有降低之傾向。藉由如此之導光體2，於與光入射端面及仏之雙方均垂直之YZ面内，自光出射面2a射出出射光光度分佈中’峰錢之衫㈣與光出射面之法線為 5〇至80度之範圍内且半高全寬為1〇至4〇向性之出射特性的光，可自光出射面2&而射出，鏡片可有效使該射出方向偏向，從而可提高高亮度之面光源裝置。供種”有 23 Ϊ320121 本發明中，自導光體2之光出射率定義如下。光出射面2a之光入射端面2c側之端緣上的光強度盥於距離L之位置上自光人射端面2e側之端緣射出之光強度⑴ 之間的關係，若將導光體2之厚度（2方向尺寸）設=t，則其滿足如下式（3)之關係： ” 一 I = I0(a/100)[I-(a/l〇〇)f …⑻ 此處，常數α係光出射率，且係自與光出射面之光 =射端面2e垂直之X方向上的每單位長度（相當於導光體厚度t之長度）導光體2之發出光比率（百分比：〇/小 =光出射率α於縱軸上取自光出射面以之出射光之光強度、對數，於橫軸上取（L/t)，並藉由對該等關係進行繪圖，而可由該斜率而求出。二：於導光體2之背面之稜鏡列，控制於與自導 ^體2之出射光之-次光源⑽平行之面（χζ面）内的 =性^可形成雙凸透鏡列或ν字狀料而代替棱鏡。體Γ α之稜鏡列，較好的是將其頂角設於内此是因為’藉由將頂纽於該範圍置之古辩夕裎#枓 ^又集中’可實現面光源裝 ri 更好的是設於9G至剛度範圍内。释光體中’以精確製作所需之稜鏡列形狀，性能’並且抑制於組裝作業時或作為光源用時的棱鏡頂部之磨損或變形為目的，可於稜鏡列之頂部形成有平坦部或曲面部。為兮1G1係延伸於x方向延伸之驗光源，且作為該一:人光源101可使用例如螢光燈或冷陰極管。該情形 24 1320121 時，一次光源101如圖6所示，不僅可對向導光體2之一方之侧端面而設置’亦可根據需要而進—步設置於反面侧之側端面。再者’作為-次光源並非僅限定於線狀光源，亦可將如LED规、时燈、金屬„料點狀光源排列為一個或複數個而加以使用。作為光偏向元件之棱鏡片1〇4之2個主面购、祕係整體相互平行而排列’且作為整體分別位於盘χγ面平行之位置。主面购、104b中之一方（位於導光體2之光出射面2a侧之主面）作為入光面_，他方作為出光面 104b。出光面lG4b作為與導光體光出射面23相平行之平坦面。入光面馳作為與複數個延伸於χ方向之棱鏡列相平行而排列之稜鏡列形成面。棱鏡列形成面可於與其鄰接之稜鏡列之間設置有寬度較窄之平坦部（例如，與棱鏡列之Υ方向尺寸相同心、於其寬度的平坦部），但自提 ^之利用效率之觀財慮，較好岐未設置平坦部而將稜鏡列沿X方向連接排列。，：中藉由棱鏡片1〇4而產生之光偏向之情況。該圖係表不來自ΥΖ面内之導光體2的峰絲（對應值之光)之前進方向者。以角度a自導光體傾斜射出之峰值光，人射至稜鏡列之第1面，而^屮面而全反射且大致沿出光面104b之法線方向而射出。又，XZ面内可藉由如上述之導光體 ==的亮：廣泛區域内實現充分提高出光面“ 25 1320121 稜鏡片104之棱鏡列之稜鏡面之形狀’並非僅限於單一平面，亦可使用例如剖面凸多角形狀或凸曲面形狀，藉此實現高亮度化、窄視野化。稜鏡片104，以精確獲得所需之稜鏡列形狀，獲得穩定之光學性能，並且抑制於組裝作業時或作為光源裝置使用時的稜鏡頂部之磨損或變形，可於稜鏡列之頂部形成有平坦部或曲面部。該情形時，形成於稜鏡列頂部之平坦部或曲面部之寬度’為小於等於3 μιη，但自抑制藉由光源裝置之亮度降低或黏滯現象而產生亮度不均一之圖案之觀點考慮，更好的是為小於等於2 μιη，進而好的是為小於等於 1 μιη。上述導光體2及稜鏡片1〇4可含有光透過率較高之合成樹脂。作為如此之合成樹脂，可列舉甲基丙烯樹脂、丙稀樹脂、聚碳酸酯樹脂、聚酯樹脂、氯化乙烯基系樹脂。特別好的是甲基丙烯樹脂，其高光透過率、耐熱性、力學特性、成升>加工性優良，故而最為合適。作為如此之甲基两烯樹脂係含有曱基丙烯酸甲酯為主要成分之樹脂，較好的是甲基丙烯酸曱酯之比例為大於等於8〇重量％者。於形成導光體2及棱鏡片104之粗糙面或稜鏡列等表面構造時，可使用具有所需之表面構造之構成部件藉由熱壓而形成透明合成樹脂板，亦可藉由網版印刷、押出成形或射出成形等而於成形之同時賦予形狀。又，可使用熱或光硬化性樹脂等而形成構造面L於由聚㈣脂、丙烯樹脂、聚碳酸醋樹脂、氣化乙職樹脂、聚ψ基丙稀醯亞胺樹脂 26 1320121 等構成之透明薄膜或薄板等透明基材表面，亦可形成由聚甲基丙烯醯亞胺構成之粗糙面構造或透鏡列排列構造，藉由黏接、黏著等方法而使如此之薄板接合於另一個透明基材上並使其一體化。作為活性能量線硬化型樹脂，可使用多官能基（甲基）丙烯化合物、乙烯基化合物、（曱基）丙烯酸酯類、烯炳基化合物、（曱基）丙烯酸之金屬鹽等。The light guide body obtained in the above manner can be used, which can form the end light source device as shown in Fig. G. In other words, the linear primary light source 10 having the reflection cover 1〇2 is disposed so as to oppose the end surface (light incident end surface) 2c of the light guide body, and is opposed to the main surface (light exit surface) 2b of the light guide body. The light reflecting film 105' is disposed in a manner, and the prism sheet 104 is disposed on the light guiding body light emitting surface 2a. Further, the light exit surface which is one of the principal surfaces of the light guide body is formed as a matte surface having a directional light emitting function, and is formed in parallel with the other main surface (back surface) 2b and extending to the light incident end face &; a plurality of columns in the direction of the vertical. Further, a plurality of parallel to the primary light source 101 and extending in the X direction are formed in the lower surface (light incident surface) i〇4a opposite to the light guide light exit surface 2a of the cymbal sheet 1〇4. Queue. The illuminating surface formed on the light-emitting surface 2a of the light guide body is emitted from the directional light required to realize the YZ plane in particular, and the luminance in the light-emitting surface is previously considered to be good. The flat bevel angle 0a is in the range of 〇·5 to 15 degrees according to IS04287/1-1984. The average tilt angle 0a is more preferably 阌疋 in the range of 1 to 12 degrees' and further preferably in the range of 15 to u degrees. The average tilt angle of the matte surface is as follows. According to IS04287/1-1984, the coarse (four) impurity is determined using the needle roughness, and the coordinate of the direction is set to ^ the tilt function 1 obtained by the under-ribbed formula (1) and the formula (7). It is obtained by X). Δa = (VL)iLl(d/dx)f(x)idx (1) = tan'(Aa)- (2) where L is the length of the measurement, and Aa is the average tilt angle such as tangent and then as a guide The light body 2 preferably has an emission ratio in the range of 〇5 to 5%, more preferably in the range of 1 to 3%. This is because if the light emission rate is 0.5%, the amount of the self-guided gold 3 is reduced and the sufficient shell size cannot be obtained. If the light emission rate is more than 5%, the light source is used once! Attached = Apricot: Attenuation of the outgoing light in the direction of the light exiting surface 2a Initially: The uniformity of the brightness on the light exiting surface 2a tends to decrease. With such a light guide body 2, in the YZ plane perpendicular to both the light incident end surface and the cymbal, the normal light beam distribution (4) and the light exit surface are emitted from the light exit surface 2a. Light having a half-height width and a full-width of 1〇 to 4〇 can be emitted from the light exit surface 2& and the lens can effectively deflect the exit direction, thereby improving high brightness. Surface light source device. In the present invention, the light emission rate from the light guide 2 is defined as follows: the light intensity on the edge of the light incident end face 2c side of the light exit face 2a is at a position L from the light The relationship between the light intensity (1) emitted from the edge of the end face 2e side is such that if the thickness (two-direction dimension) of the light guide 2 is set to t, it satisfies the relationship of the following formula (3): "I = I0 ( a/100) [I-(a/l〇〇) f (8) Here, the constant α is the light emission rate, and is per unit length in the X direction perpendicular to the light of the light exit surface = the end surface 2e ( Corresponding to the length of the thickness t of the light guide body) The ratio of the emitted light of the light guide body 2 (percent: 〇 / small = the light exit rate α is the light intensity and the logarithm of the light emitted from the light exit surface on the vertical axis The axis is taken (L/t) and is plotted by the relationship, and can be obtained from the slope. Second: the column on the back side of the light guide body 2 is controlled by the self-guide body 2 The illuminating light-sub-light source (10) parallel surface (the surface of the χζ) can form a lenticular lens column or a ν-shaped material instead of the prism. The body Γ α 稜鏡, preferably the top The angle is set in this because it is better to set the surface light source ri by setting the top button to the range of the ancient 裎裎枓又又又更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好更好It is possible to form a flat portion or a curved surface portion on the top of the array for the purpose of accurately producing the desired shape and performance of the array and suppressing abrasion or deformation of the prism top at the time of assembly work or as a light source. The 兮1G1 system extends the light source extending in the x direction, and as the one: the human light source 101 can use, for example, a fluorescent lamp or a cold cathode tube. In this case 24 1320121, the primary light source 101 is not only correct as shown in FIG. The side surface of one side of the light guide body 2 may be provided as 'the side end surface of the reverse side side as needed. Further, the 'secondary light source is not limited to the linear light source, and may be, for example, an LED gauge. The light source and the metal material are arranged in one or a plurality of light sources. The two main facets of the prism sheet 1〇4 as the light deflecting element and the secret system are arranged in parallel with each other and are respectively located in the disk. The position where the χγ plane is parallel. The main surface One of 104b (the main surface on the light exit surface 2a side of the light guide 2) serves as the light incident surface _, and the other side serves as the light exit surface 104b. The light exit surface lG4b serves as a flat surface parallel to the light guide light exit surface 23. The entrance surface is formed as a line forming surface parallel to a plurality of prism columns extending in the χ direction. The prism column forming surface may be provided with a flat portion having a narrow width between the adjacent columns ( For example, the flat portion of the width of the prism row is the same as the width of the prism, but it is preferable that the flat portion is not provided and the array is connected in the X direction. , : The case where the light generated by the prism sheet 1 〇 4 is biased. The figure is not from the forward direction of the peak of the light guide 2 in the pupil plane (corresponding value light). The peak light emitted from the light guide at an angle a is incident on the first surface of the array, and is totally reflected and substantially emitted along the normal direction of the light exit surface 104b. Further, the XZ plane can be brightened by the light guide body == as described above: the light-emitting surface can be sufficiently improved in a wide area. The shape of the surface of the prism column of the wafer 104 is not limited to a single plane. The use of, for example, a profiled convex polygonal shape or a convex curved surface shape, thereby achieving high brightness and narrow field of view. The ruthenium sheet 104 is used to accurately obtain a desired sinusoidal shape to obtain stable optical properties, and is suppressed during assembly work or As the wear or deformation of the top of the crucible when used as a light source device, a flat portion or a curved surface portion may be formed on the top of the array. In this case, the width of the flat portion or the curved portion formed at the top of the array is smaller than It is equal to 3 μm, but it is more preferably 2 μm or less, and more preferably 1 μm or less, from the viewpoint of suppressing the pattern of uneven brightness by the brightness reduction or viscous phenomenon of the light source device. The light guide body 2 and the cymbal sheet 1 〇 4 may contain a synthetic resin having a high light transmittance. Examples of such a synthetic resin include methacrylic resin, acryl resin, and polycarbonate. Resin, polyester resin, and chlorinated vinyl resin. Particularly preferred is a methacrylic resin which is most suitable for its high light transmittance, heat resistance, mechanical properties, and liters. The diene resin is a resin containing methyl methacrylate as a main component, and preferably a ratio of decyl methacrylate is 8% by weight or more. The rough surface of the light guide body 2 and the prism sheet 104 is formed or In the case of a surface structure such as a matrix, a transparent synthetic resin sheet can be formed by hot pressing using a constituent member having a desired surface structure, and can be imparted at the same time by screen printing, extrusion molding, or injection molding. Further, a structural surface L may be formed by using a heat or photocurable resin or the like in the form of poly(tetra) grease, acryl resin, polycarbonate resin, gasification resin, polyacrylonitrile amide resin 26 1320121, and the like. The surface of the transparent substrate such as a transparent film or a thin plate may be formed into a rough surface structure or a lens array structure composed of polymethacrylimide, which is adhered by adhesion, adhesion, or the like. The thin plate is bonded to and integrated with another transparent substrate. As the active energy ray-curable resin, a polyfunctional (meth) propylene compound, a vinyl compound, a (mercapto) acrylate, or an ene group can be used. a compound, a metal salt of (meth)acrylic acid, and the like.

作為光反射膜105可使用例如於表面具有金屬蒸鍍反射層之塑料膜。繼而，圖8係表示本發明之使用有面光源裝置用導光體之面光縣置的-個實施形態的立體模式圖，圖9係其部分剖面圖。如圖所示，本實施形態之面光源裝置，含有：導光體23，該導光體23將至少-個側端面作為光入射端面231 ’並將與其大致垂直之一個表面作為光出射面233 ; 線狀-次光源2卜該線狀—次純21對向於該導光體^ 之光入射端面23!配置，並由光源反射罩22覆蓋；光偏向讀心該光偏向元件r配置於導光體23光出射面上；，反射元件25，該光反射元件25對向於與導紐23之光出射面233為相反側之背面234而配置。導光體23大致與χγ面平行而配置，且其板狀。導紐23具有4個侧端面，其中將與γζ面錢^ :丁之上對側端面中之至少一個側端面作為光入射端面 2=。光入射端面23卜與一次光源21對向配置，將自一 j源發出之光自光人射端面231導人至導光體23内。於本發明中，例如，於與光人射端面231為相反侧之側端面 27 1320121 232等其他側端面’亦可對向配置—次光源。大致與導光體23之光入射端面231垂'直分別與ΧΥ平面大致平行，任一方之之2個主面作為光出射面233。將含有粗糙面之指=== 與至該光出射面233或其昔而Μ射機構付導入射至二射中之至少-個，而使引導入射至先人·面31之光藉由導光體23，並於射端面23i及光出射面233兩者垂直之面（χζ面）、=，使具有指向性之光自光出射面233射出。該χζ面内之出射光光度分佈之峰值之方向（峰值光），與光出射面形成之角度設為α。角度為α係例如1〇至4G度，出射光度分佈之半高全寬係例如1〇至4〇度。开ν成於導光體23之主面且含有指向性光出射機構之粗糙面或透鏡列’自提高光出射面内之亮度之均句度之觀點考慮，較好的是將平均傾斜角此，設於〇 5至15度之範圍内。平1傾斜角如，，更好的是位於1至12度之範圍内，進而好的是位於1.5至U度之範圍内。又，關於平均傾斜角之測定方法’以下加以敍述。又’未付與指向性光出射機構之其他主面，為控制與自導光體23之出射光之一次光源21平行的面（YZ面）内之指向性’較好的是成為透鏡列形成面，該透鏡列形成面排列有延伸於與光入射端面231為大致垂直方向的複數個透鏡列。於圖8所示之實施形態中，於光出射面233中形成有粗》面’且於背面234中形成有透鏡列形成面，該透鏡列形成面含有延伸於與光入射端面231大致垂直方向 28 1320121 (大致係X方向）複數個透鏡列的排列。於本發明中，與圖8所示之形態相反’可於光出射面233中形成有透鏡列形成面，而將背面234作為粗糙面。如圖8所示，於導光體23之背面234或光出射面233 中形成用以控制YZ面中之指向性的透鏡列形成面之情形時，作為該透鏡列，可列舉大致沿x方向延伸之稜鏡列、雙凸透鏡列、V字狀溝等，較好的是將γζ剖面之形狀大 φ 致設為三角形之稜鏡列。於本發明中，於導光體23之背面234中形成棱鏡列形成面作為透鏡列形成面之情形時，較好的是將其頂角設為 85至11〇度之範圍内。此是因為，藉由使頂角位於該範圍内而可使來自導光體23之出射光適度集中，並且可實現提向面光源裝置之亮度，更好的是為90至1〇〇度之範圍内。本發明之導光體，以精確獲得所需之稜鏡列形狀，獲得穩定之光學性能，並且抑制於組裝作業時或作為光源裝置使用時之稜鏡頂部之磨損或變形為目的，亦可於稜鏡列 ® 之頂部形成平坦面或曲面部。再者’於本發明中’可與形成於如上述之光出射面233 或其背面234之光出射機構併用，亦可附加指向性光出射機構，該指向性光出射機構使光擴散性微粒子混入並分散於導光體内部。圖10係本實施形態中之導光體23之部分放大剖面圖。導光體23係光入射端面231與光出射端面233形成之角度為Θ1 ’光入射端面231與背面234形成之角度為02。 29 1320121 I等角度Θ1、Θ2，係指光入射端面231與其附近之例，^历以内之光出射面233或背面234所形成的角度。二椒&光體23於光入射面231形成為厚楔形，楔角為θ3。 ^ . θ3 ’係指沿X方向平均之光出射面233與背面234 ♦ ^角度。角度㊀1為大於等於88.2度、小於等於89 6 度，較好的是大於等於88.6度、小於等於89度。角度的 =於等於89.4度、小於等於91度，較好的是大於;於 9〇度、小於等於90.5度。若角度㊀卜e2位於該等範圍之外，則有可能斜光及亮斑變得顯I㈣θ3例如為大於等於0.1度、小於等於1度。；光入射為面23丨’導光體23之大致厚度方向之平均傾斜角度Θ&為大於等於3。、小於等於12。。藉由使光入射端面231之大致導光體厚度d之方向（大致為ζ方向：參照圖9)之平均傾斜角0a設於該範_，㈣當調節面内之光之分佈’特別適當的是自導光體光出射面233之光入射端面附近區域之光出射（光量及出射角分佈），且於伴隨導光體薄型化之光入射端面附近區域難以出現亮斑。平均傾斜角0a若不滿3。’則自導光體光人射端面之附近區域之出射光量變少’該區域之亮度變得過低，另一方面，若平均傾斜角θα超過12。，則自導光體光人射端面之附近區域之出射光量變多，顧域之亮度變得過高，進而難以降低光入射端面附近之斜方向之特殊光出射。光入射端面 231之導光體23之大致厚度方向之平均傾斜角0a，較好的是大於等於5°、小於等於丨丨。，其更好岐大於等於6。、 30 1320121As the light reflecting film 105, for example, a plastic film having a metal vapor-deposited reflective layer on its surface can be used. Fig. 8 is a perspective view showing an embodiment of the surface light source of the light guide device for a surface light source device of the present invention, and Fig. 9 is a partial cross-sectional view thereof. As shown in the figure, the surface light source device of the present embodiment includes a light guide body 23 having at least one side end surface as a light incident end surface 231' and a surface substantially perpendicular thereto as a light exit surface 233. The linear-sub-light source 2 is arranged in the line-sub-purity 21 opposite to the light incident end face 23! of the light guide body, and is covered by the light source reflector 22; the light is deflected toward the read center. The light guide surface of the light guide body 23; the reflection element 25 disposed opposite to the back surface 234 opposite to the light exit surface 233 of the guide button 23. The light guide body 23 is disposed substantially in parallel with the χγ plane, and has a plate shape. The guide bar 23 has four side end faces, wherein at least one of the side end faces of the opposite side faces of the γ ζ ^ 作为作为。。。。。。。。。. The light incident end face 23 is disposed opposite to the primary light source 21, and light emitted from a j source is guided from the light incident end face 231 to the light guide body 23. In the present invention, for example, the other side end surface such as the side end surface 27 1320121 232 opposite to the light incident end surface 231 may be disposed to face the secondary light source. The light incident end surface 231 of the light guide body 23 is substantially perpendicular to the pupil plane, and the two main surfaces are the light exit surface 233. Introducing the finger containing the rough surface === with at least one of the light exiting surface 233 or the past radiation mechanism into the two shots, and directing the light incident on the front surface 31 by the guide The light body 23 emits light having directivity from the light exit surface 233 on the surface (the surface) perpendicular to both the end surface 23i and the light exit surface 233. The direction (peak light) of the peak of the emitted light luminosity distribution in the pupil plane is set to α with the angle of the light exit surface. The angle is α, for example, 1 〇 to 4 G degrees, and the full width at half maximum of the exit luminosity distribution is, for example, 1 〇 to 4 〇. It is preferable to open the average tilt angle of the light surface of the light guide body 23 and the rough surface or the lens array of the directivity light exiting mechanism from the viewpoint of increasing the uniformity of the brightness in the light exit surface. It is located in the range of 5 to 15 degrees. The flat 1 tilt angle is, for example, preferably in the range of 1 to 12 degrees, and more preferably in the range of 1.5 to U degrees. Further, the method of measuring the average tilt angle will be described below. Further, the other principal surface of the unpaid and directional light emitting means is preferably formed into a lens column for controlling the directivity in the surface (YZ plane) parallel to the primary light source 21 of the light emitted from the light guide 23. In the surface, the lens column forming surface is arranged in a plurality of lens rows extending in a direction substantially perpendicular to the light incident end surface 231. In the embodiment shown in FIG. 8, a rough surface is formed on the light exit surface 233, and a lens array forming surface is formed on the back surface 234. The lens array forming surface extends substantially perpendicular to the light incident end surface 231. 28 1320121 (Approximating the X direction) The arrangement of a plurality of lens columns. In the present invention, contrary to the embodiment shown in Fig. 8, a lens row forming surface can be formed in the light exit surface 233, and the back surface 234 can be used as a rough surface. As shown in FIG. 8, when the lens column forming surface for controlling the directivity in the YZ plane is formed in the back surface 234 or the light exit surface 233 of the light guide 23, the lens row may be substantially in the x direction. It is preferable that the shape of the γζ cross section is large φ into a triangular array, such as a sinuous column, a lenticular lens row, a V-shaped groove, or the like. In the present invention, in the case where the prism array forming surface is formed as the lens column forming surface in the back surface 234 of the light guide body 23, it is preferable to set the apex angle to be in the range of 85 to 11 Torr. This is because the emitted light from the light guide body 23 can be moderately concentrated by setting the apex angle within the range, and the brightness of the lifted-surface light source device can be realized, and it is more preferably 90 to 1 degree. Within the scope. The light guide body of the present invention can accurately obtain the desired shape of the array, obtain stable optical properties, and suppress the wear or deformation of the top of the crucible during assembly work or when used as a light source device, or The top of the ® ® ® forms a flat or curved surface. Further, 'in the present invention' may be used in combination with a light-emitting means formed on the light-emitting surface 233 or the back surface 234 as described above, or a directional light-emitting means may be added, and the directional light-emitting means may mix the light-diffusing fine particles And dispersed inside the light guide. Fig. 10 is a partially enlarged sectional view showing the light guide body 23 in the embodiment. The angle between the light incident end surface 231 and the light exit end surface 233 of the light guide body 23 is Θ1'. The angle between the light incident end surface 231 and the back surface 234 is 02. 29 1320121 I is an angle Θ1, Θ2, which refers to the angle formed by the light incident end surface 231 and its vicinity, the light exit surface 233 or the back surface 234. The second pepper & light body 23 is formed into a thick wedge shape on the light incident surface 231 with a wedge angle of θ3. ^ . θ3 ' means the angle between the light exit surface 233 and the back surface 234 ♦ ^ averaged in the X direction. The angle -1 is greater than or equal to 88.2 degrees and less than or equal to 89 degrees, preferably greater than or equal to 88.6 degrees and less than or equal to 89 degrees. The angle = is equal to 89.4 degrees, less than or equal to 91 degrees, preferably greater than; 9 degrees, less than or equal to 90.5 degrees. If the angle - e2 is outside the range, it is possible that the oblique light and the bright spot become visible. (IV) θ3 is, for example, greater than 0.1 degrees and less than or equal to 1 degree. The light incidence is the surface 23丨' The average tilt angle Θ& of the light guide body 23 in the approximate thickness direction is 3 or more. Less than or equal to 12. . By setting the average tilt angle 0a of the direction of the substantially light guide thickness d of the light incident end surface 231 (approximately the ζ direction: see FIG. 9) to the range _, (4) the distribution of light in the adjustment plane is particularly appropriate. The light is emitted from the vicinity of the light incident end surface of the light guide light exit surface 233 (light quantity and emission angle distribution), and bright spots are hard to occur in the vicinity of the light incident end surface accompanying the thinning of the light guide body. The average tilt angle 0a is less than 3. The amount of light emitted from the vicinity of the end face of the light guide body is small. The brightness of the area is too low. On the other hand, the average tilt angle θα exceeds 12. Further, since the amount of light emitted from the vicinity of the end face of the light guide body is increased, the brightness of the region is too high, and it is difficult to reduce the extraordinary light emission in the oblique direction near the light incident end face. The average inclination angle 0a of the light guide body 23 of the light incident end surface 231 in the substantially thickness direction is preferably 5 or more and less than or equal to 丨丨. , its better 岐 is greater than or equal to 6. , 30 1320121

小於等於9°。平均傾斜角纟ea，可自使用超深度形狀測定顯微鏡 (例如KEYENCE會社製造之νκ·85〇〇[商品名])而測得之傾斜角而獲得。即，平均傾斜角可使用超深度形狀測定顯微鏡而測定導光體23之光入射端面等面之中心線平均粗糙度Ra及十點平均粗糙度Rz，讀取測定範圍内之、 Rz ’並根據該取範_· G2之條件下而提取剖面曲線’求出各測定點（因於朗定條件下—次可測定之範圍為ΙΙΟμηι’故而而於除去導光體光入射端面之導光體厚卢方向之兩端的50叫的區域中，以等間隔進行5處測定广之傾斜角之絕對值，藉由平均該等值而得到。如上之平均傾斜角0a，對敎點之源裝置之光_性有影響。特暇根據之測量而得之傾斜角之度數分佈中，傾 ^角主要為大於等於2〇。之絲之存姐率對光Less than or equal to 9°. The average tilt angle 纟ea can be obtained by using an ultra-depth shape measuring microscope (for example, νκ·85〇〇 [trade name] manufactured by KEYENCE Co., Ltd.). In other words, the average tilt angle can be measured using the ultra-depth shape measuring microscope to measure the center line average roughness Ra and the ten-point average roughness Rz of the surface of the light incident end surface of the light guide 23, and read Rz' in the measurement range and The profile curve is extracted under the condition of the _· G2 condition. The measurement points are obtained (the range of the light guide body at which the light incident end face is removed due to the measurable range of ΙΙΟμηι' under the conditions of the Langding condition) In the 50-called area at both ends of the direction of the Lu, the absolute values of the tilt angles measured at five equal intervals are obtained by averaging the equivalent values. The average tilt angle 0a as above, the light of the source device to the point _ Sex has an effect. In the distribution of the degree of inclination obtained from the measurement, the inclination angle is mainly greater than or equal to 2 〇.

方向之特殊光出射的產生有影響。為降低面光 ΐίϋΐίΓ面附近之斜方向之特殊光出射，較好的之形成^光人射端面231 ♦有例如_面。作為粗縫面切削加工裝置:==用本發明之切削工具及端面方法，猎由其他之銑刀工具等切削方 1320121The production of special light from the direction has an effect. In order to reduce the surface light 特殊 ϋΐ ϋΐ ϋΐ 特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊特殊As a rough surface cutting machine: == With the cutting tool and end face method of the present invention, hunting is performed by other milling tools, etc. 1320121

法，藉由研磨石、砂紙、磨輪等研磨方法，及藉由鼓風加工、放電加X、電解研磨、化學研料之方法。作於鼓風加工巾之鼓難子，可麟如_球之球形物，及如軋化錄之多角形物，較好的是使用多角形物可形成擴光效果大之粗㈣。藉由調整湖加王或研磨加工之加工方向而可形成非等向性之粗链面。為調節χγ面内之光之擴散，可_大致為Ζ方向之加玉方向並形獻致為ζ方向之線狀凹凸形狀，為調節χζ面内之光之擴散，可採用 Υ方向之加工方向並形成Υ方向之線狀凹凸形狀。藉由組合其他複數個互不相同之加X方向，可形成無方向性之粗糙面。該粗糙面加工可直接實施於導光體之光入射端面上，亦可於使用構成部件而將透光性合成樹脂成形於導光體之金屬模中，於用以形成構成部件之光入射端面轉印的面形成有對應轉印形成面時，藉由於成形時轉印至透光性合成樹脂而加以實施。The method is a grinding method such as grinding stone, sandpaper, grinding wheel, or the like, and a method of blasting, discharging, adding X, electrolytic grinding, and chemical grinding. For the blasting of the blasting towel, the lining is like a spherical object, and a polygonal object such as a rolled-up recording. It is preferable to use a polygonal object to form a thickening effect (four). An anisotropic thick chain surface can be formed by adjusting the processing direction of the lake king or the grinding process. In order to adjust the diffusion of light in the χγ plane, the direction of the jade in the direction of the Ζ can be roughly formed and the shape of the line is convex and convex. In order to adjust the diffusion of light in the χζ surface, the processing direction of the Υ direction can be used. And forming a linear concave-convex shape in the Υ direction. By combining a plurality of other mutually different X directions, a non-directional rough surface can be formed. The rough surface processing can be directly performed on the light incident end surface of the light guide body, or the light transmissive synthetic resin can be formed in the metal mold of the light guide body using the constituent members, and the light incident end surface for forming the constituent member can be formed. When the transfer surface is formed to correspond to the transfer forming surface, it is transferred to the light-transmitting synthetic resin by molding.

又，光入射端面231可係含有透鏡列形成面者，而代替粗糙面，該透鏡列形成面以相互平行方式排列有延伸於與導光體之厚度方向（Ζ方向）垂直之方向（γ方向）的複數個透鏡列。至於透鏡列，可使用稜鏡列。自光擴散效果方面考慮，較好的是該透鏡列係於其Χ2剖面形狀含有曲線者。圖11中表示形成有如此之透鏡列之光入射端面之剖面形狀之模式放大圖。於該例中，透鏡面231a係以曲率半徑 R而向外凸出之曲面，藉由頂角φ具有相對間距p之三角稜鏡形狀之最大距離d。作為如此之光入射端面之透鏡列形成 32 1320121 面之形成方法，較好的是使用上述本發明之切削工具及端面切削加工裝置之切削方法，及藉由其他銳刀工具等進行切削之方法。該透鏡列形成面之加工，可於導光體之光入射端面上直接實施，亦可於使用構成部件於導光體成形透明性合成樹脂的金屬職置中，於用以形成構成部件之光入射端面轉印的面上形成對應轉印形成面時，於成形時將其轉印至透明性合成樹脂而實施。 • 進而’作為光入射端面231係具備於導光體之厚度方向 (z方向）垂直之方向（γ方向）相互平行並延伸之複數個透鏡列的透鏡列形成面，且可係含有透鏡列之至少一部分進行粗面化而成之粗㈣透鏡列形成面者。該粗面化之透鏡列形成面之粗面化，可列舉藉由砂紙、磨輪等之研磨方去及藉由銑刀加工、電解研磨、化學研磨等之方法。該等粗糙面加工，可於形成有導光體之透鏡列之光入射端”面上直接實施，亦可於使用構成部件於導光體上成形透明性合成樹脂的模具裝置中’於用以形成構成部件之光入射端面轉印的面上形成對應轉印形成面時，藉由於成形時將其轉印至透明性合成樹脂而實施。如上，於面光源裝置用導光體之一個製造方法中，因使用構成部件而使透光性合成樹脂成形，藉由該構成部件之表面之形狀轉印而獲得對應於導光體之導光原料。藉此，可以與光出射面及背面相同之方式形成對應於導光體之光出射面以及背面的導光原料之面。繼而，藉由對對應於導光體之光入射端面之導光原料之面進行切削加工而形 33 1320121 成光入射端面’從而獲得面光源裝置用導光體。又，於面光源裝置用導光體之另一個製造方法中，因使用構成部件而使透光性合成樹脂成形，藉由該構成部件之表面之形狀轉印而形成光出射面、背面及光入射端面，並獲得上述面光源裝置用導光體。光入射端面231，又，根據超深度形狀測定顯微鏡之測量而獲得之導光體之厚度方向的中心線平均粗链度Ra 較好的疋大於等於0.2μηι、小於等於0.4以⑺，根據超深声形狀測定顯微鏡之測量而獲得之上述導光體之厚度方向的籲十點平均粗糙度Rz較好的是大於等於〇 7 μιη、小於等於2 μηι。藉由設為如此之範圍，容易將上述平均傾斜角如及傾斜角之度數分佈中，傾斜角為大於等於2〇。之成分之存在比率設於所定之範圍内。又，光入射端面231之表面特性，較好的是沿長度方向，即，與導光體厚度方向（Ζ方向）垂直之方向方向），平均傾斜角0a為1至3度，中心線平均粗糖度以為0.02至Ο.ΐμπι，十點平均粗糙度以為〇 3至2。此處，平均傾斜角θ&，更好的是li3至2·7度，特別好的是攀 1.5至2.5度之範圍。中心線平均粗糙度尺&，更好的是〇至〇.〇8 μηι，特別好的是〇.〇5至〇〇7 μιη之範圍。十點平均粗縫度Rz ’更好的是〇 4至1.7 μηι，特別好的是〇 5至 1.5 μιη之範圍。作為導光體23，並非僅限定於如圖9所示之楔形者，亦可使用大致為均—厚度者（即，03 = 〇)。 34 1320121 ^光偏向元件24配置於導光體23之光出射面233上。光偏向疋件24之2個主面241、242，整體相互平行而排列’且整體分別位於與χγ面平行之位置。主面241、242 中之一方（位於導光體23之光出射面233側之主面）作為 =光面241，另一方作為出光面242。出光面242作為與導光體23之光出射面233相平行之平坦面。入光面241作為與複數個延伸於Υ方向之稜制相平行而㈣之稜鏡列形 φ成面。棱鏡列形成面亦可於與其鄰接之稜鏡列之間設置有寬度較窄之底部平坦部（例如，與稜鏡列之χ方向尺寸相同或小於寬度之平坦部），但自提高光之利用效率之觀點考慮’較好的是未設置底部平坦部而將稜鏡列連接於X方向而排列。於圖12中’其模式地表示有藉由光偏向元件24而產生之光偏向之情況。該圖係表示自ΧΖ面内之導光體23發出之峰值光（對應於出射光分佈之峰值之光）之前進方向的一例者。以角度a且自導光體23之光出射面233傾斜射肇出之峰值光，入射至棱鏡列之第1稜鏡面，並藉由第2面而内面全反射，從而大致沿出光面242之法線方向而射出。又’於YZ面内’可藉由如上述之導光體背面234之稜鏡列之作用而於廣泛區域内實現充分提高出光面242之法線方向的亮度。於圖13中，作為參考’模式性地表示自導光體光出射面、特別是光入射端面附近區域之光出射之情況。又，於圖14中，作為參考，模式性地表示自面光源裝置之光偏向 35 1320121 元件出光面、特別是導光體的光入射端面附近區域之光出射之情況。如圖13及圖14所示’導光體光出射面233之中央部區域（光入射端面附近以外之區域）中，如圖13 所示’自光入射端面231入射之光之峰值光’與光出射面 233形成角度α而射出，並自一方之棱鏡面入射至光偏向元件24 ’於另一方之稜鏡面内進行内面反射’並沿出光面法線方向射出。與此相對，於導光體光出射面233之光入端面附近區域’峰值光與光出射面233形成角度β而射出，並自一方之稜鏡面入射至光偏向元件24,根據角度β之大 _ 小，於光偏向元件24之另一方之稜鏡面内進行或未進行内面反射，並與出光面形成角度γ而射出。上述角度β藉由導光體之光入射端面231之形態，例如分別與光出射面233及背面234所形成之角度01、02 而受影響，進而藉由表面特性而受影響，特別是受ΧΖ面内之平均傾斜角0a及傾斜角度數分佈之影響。若角度Θ1、Θ2過大，則角度β小於角度α，且自該區域之出射光少’因此，該區域之亮度過低且亮度均句度易下降。若角度Θ1、Θ2過小，則角度β大於角度α，且自，區域之出射光量變多’因此，該區域之亮度過度增加且亮度均勻度易下降。若角度β大於角度α，則射入至光偏向兀件24之光未經由稜鏡面之内面反射而僅受到折射作用並出現出光之成分。若該成分過多，則上述光入射端面附近區域中之斜方向之特殊光出射將變得顯眼。進而’若平均傾斜角Μ過小，則角度ρ小於角度α， 36 1320121 且自該區域之出射光量變少，因此，該區域之亮度過低且亮度均勻度易下降。若平均傾斜角如過大，則角度P大於角度α，且自該區域之出射光量變多，因此，該區域之亮度過度增加且亮度均勻度易下降。若角度ρ大於角度α，則射入至光偏向元件24之光未經由稜鏡面之内面反射而僅爻到折射作用並出現出光之成分。若該成分過多則上述光入射端面附近區域中之斜方向之特殊光出射將變得顯眼。又，若傾斜角之度數分佈中至傾斜角為大於等於2〇。之成分的存在比率過大，則射入至光偏向元件24之光未經由棱鏡面之内面反射而僅受到折射作用且出光之成分過多，上述光入射端面附近區域中之斜方向之特殊光出射將變得顯眼。因此，於本發明中，為於光入射端面附近區域實現盘中央部相同或接近之光出射狀態，而將角度θ1、θ2之^ 圍、及平均傾斜角如之範圍，進而傾斜角之傾斜角為大於等於20。之成分的存在比率之範圍，嗖於上述特定範圍内，藉麟持亮度均勻紅_光人射端面附近區域之斜方向之特別出射光的產生。〜光偏向元件24中’以精確獲得所需之稜卿狀，獲得穩定之光學性能，並且抑制於組裝作料或作為光源裝置使用時稜鏡頂部之磨損或變形為目的，亦部形成有頂部平坦部或頂部曲面部。該情=稜由光源裝置之亮度低絲滯縣而產生亮度不均一之圖^ 37 1320121 的觀點考慮，較好的是為小於等於3帅，更$^平坦部或頂部曲面部之寬度設為棒耸於？ I 野的疋將頂部平坦面或頂部曲面部設 = ;:，進而更好的是設為小於等於― 例如螢光ΜΑ 5延伸於Y方向之線狀光源，且可使用 -人无源21如圖8所子，丁，側端面而設置之餅，面向導光體23之一方之側之侧端面。作為」次光、^據_^^錢置於反面Further, the light incident end surface 231 may include a lens column forming surface instead of the rough surface, and the lens column forming surfaces are arranged in parallel with each other so as to extend in a direction perpendicular to the thickness direction (Ζ direction) of the light guiding body (γ direction) a plurality of lens columns. As for the lens column, a column array can be used. From the viewpoint of light diffusion effect, it is preferred that the lens array has a curve in its Χ2 cross-sectional shape. Fig. 11 is a schematic enlarged view showing a cross-sectional shape of a light incident end surface on which such a lens array is formed. In this example, the lens surface 231a is a curved surface which is convex outward with a radius of curvature R, and the maximum angle d of the triangular prism shape having a relative pitch p by the apex angle φ. As a method of forming the lens array 32 1320121 surface of such a light incident end surface, it is preferable to use the above-described cutting tool of the present invention and a cutting method of the end surface cutting apparatus, and a method of cutting by another sharp knife tool or the like. The lens column forming surface can be directly formed on the light incident end surface of the light guide body, or can be used to form the light of the constituent member in the metal working position in which the transparent member synthetic resin is formed by using the constituent member in the light guide body. When a surface corresponding to the transfer surface is formed on the surface on which the incident end face is transferred, it is transferred to a transparent synthetic resin at the time of molding. Further, the light incident end surface 231 is a lens column forming surface including a plurality of lens rows which are parallel to each other in a direction (γ direction) in which the thickness direction (z direction) of the light guide body is perpendicular to each other, and may include a lens column. At least a part of the rough (four) lens array formed by roughening is formed. The surface of the roughened lens array forming surface is roughened, and examples thereof include a method of polishing by sandpaper or a grinding wheel, and a method of milling, electrolytic polishing, chemical polishing, or the like. The rough surface processing may be directly performed on the light incident end surface of the lens array on which the light guide body is formed, or may be used in a mold device using a constituent member to form a transparent synthetic resin on the light guide body. When the surface on which the light incident end surface of the constituent member is transferred is formed on the surface corresponding to the transfer forming surface, it is transferred to the transparent synthetic resin during molding. As described above, one of the light guides for the surface light source device is manufactured. In this case, the light-transmitting synthetic resin is molded by using the constituent member, and the light guiding material corresponding to the light guiding member is obtained by transferring the shape of the surface of the constituent member. This can be the same as the light emitting surface and the back surface. The method forms a surface corresponding to the light-emitting surface of the light guide body and the light-conducting material of the back surface. Then, by cutting the surface of the light-guiding material corresponding to the light incident end surface of the light guide body, the shape is 33 1320121 In the other method of manufacturing the light guide for the surface light source device, the light-transmitting synthetic resin is formed by using the constituent member. The light-emitting surface, the back surface, and the light incident end surface are formed by transfer of the shape of the surface of the constituent member, and the light guide for the surface light source device is obtained. The light incident end surface 231 is further measured by the ultra-depth shape measurement microscope. The center line average thick chain width Ra of the obtained light guide body in the thickness direction is preferably μ greater than or equal to 0.2 μm, and less than or equal to 0.4 (7), and the thickness direction of the light guide body obtained by measuring the ultra-deep shape measuring microscope The average roughness Rz of the ten points is preferably 大于7 μηη or more and 2 μηι or less. By setting it as such a range, it is easy to distribute the above-mentioned average inclination angle such as the inclination angle degree, and the inclination angle is larger than The ratio of the existence of the component is set to be within a predetermined range. Further, the surface characteristic of the light incident end surface 231 is preferably in the longitudinal direction, that is, the direction perpendicular to the thickness direction of the light guide body (Ζ direction). ), the average tilt angle 0a is 1 to 3 degrees, the centerline average roughness is 0.02 to Ο.ΐμπι, and the ten point average roughness is 〇3 to 2. Here, the average tilt angle θ &Amp;, better is li3 to 2. 7 degrees, especially good to climb the range of 1.5 to 2.5 degrees. Center line average roughness ruler & better, 〇 to 〇. 〇 8 μηι, particularly good It is a range of 〇.〇5 to 〇〇7 μιη. The ten-point average rough degree Rz' is more preferably 〇4 to 1.7 μηι, particularly preferably 〇5 to 1.5 μηη. As the light guide 23, not It is only limited to the wedge shape as shown in Fig. 9. It is also possible to use a substantially uniform thickness (i.e., 03 = 〇). 34 1320121 The optical deflecting element 24 is disposed on the light exit surface 233 of the light guide body 23. The two main faces 241 and 242 of the deflecting member 24 are arranged in parallel with each other and are respectively located at positions parallel to the χγ plane. One of the main faces 241 and 242 is located on the light exit face 233 side of the light guide body 23. The main surface is the = smooth surface 241 and the other is the light exit surface 242. The light-emitting surface 242 serves as a flat surface parallel to the light exit surface 233 of the light guide 23. The light incident surface 241 is formed as a surface parallel to the plurality of ridges extending in the Υ direction and (4). The prism column forming surface may be provided with a bottom flat portion having a narrow width (for example, a flat portion having the same or smaller width than the width direction of the array) between the adjacent rows, but the use of self-increasing light From the viewpoint of efficiency, it is preferable that the bottom flat portion is not provided and the array is connected in the X direction. In Fig. 12, it exemplarily shows the case where the light deflected by the light deflecting element 24 is deflected. This figure shows an example of the forward direction of the peak light (light corresponding to the peak of the outgoing light distribution) emitted from the light guide 23 in the pupil plane. The peak light that is obliquely emitted from the light exit surface 233 of the light guide body 23 at an angle a is incident on the first pupil plane of the prism array, and is totally reflected by the inner surface by the second surface, so as to substantially along the light exit surface 242 Shooting in the normal direction. Further, in the YZ plane, the brightness in the normal direction of the light-emitting surface 242 can be sufficiently increased in a wide area by the action of the above-described arrangement of the light guide back surface 234. In Fig. 13, as a reference, the case where the light from the light guide surface of the light guide, particularly the vicinity of the light incident end face, is emitted is schematically shown. Further, in Fig. 14, reference is made to the case where the light from the surface light source device is deflected toward the light exiting surface of the element, particularly the region near the light incident end face of the light guide. As shown in FIG. 13 and FIG. 14 , the central portion of the light guide light exit surface 233 (the region other than the vicinity of the light incident end surface), as shown in FIG. 13 , 'the peak light of the light incident from the light incident end surface 231 ' The light exit surface 233 is emitted at an angle α, and is incident on one of the prism faces from the prism surface of the light deflecting element 24' in the other side, and is emitted in the normal direction of the light exit surface. On the other hand, in the region near the light entrance end surface of the light guide light exit surface 233, the peak light is emitted at an angle β with the light exit surface 233, and is incident on the light deflecting element 24 from one of the top surfaces, depending on the angle β. _ Small, with or without internal reflection in the other side of the light deflecting element 24, and emitting at an angle γ with the light exiting surface. The angle β is affected by the light incident end surface 231 of the light guide body, for example, the angles 01 and 02 formed by the light exit surface 233 and the back surface 234, respectively, and is affected by the surface characteristics, particularly by the surface. The influence of the average inclination angle 0a and the distribution of the number of inclination angles in the plane. If the angles Θ1 and Θ2 are too large, the angle β is smaller than the angle α, and the amount of light emitted from the region is small. Therefore, the luminance of the region is too low and the luminance uniformity is liable to decrease. If the angles Θ1 and Θ2 are too small, the angle β is larger than the angle α, and the amount of light emitted from the region becomes large. Therefore, the luminance of the region is excessively increased and the luminance uniformity is liable to decrease. If the angle β is larger than the angle α, the light incident on the light deflecting element 24 is not reflected by the inner surface of the pupil surface, but is only subjected to refraction and appears as a component of light. If the amount of the component is too large, the extraordinary light emission in the oblique direction in the vicinity of the light incident end surface becomes conspicuous. Further, if the average tilt angle Μ is too small, the angle ρ is smaller than the angle α, 36 1320121 and the amount of light emitted from the region is small. Therefore, the luminance of the region is too low and the luminance uniformity is liable to decrease. If the average tilt angle is too large, the angle P is larger than the angle α, and the amount of light emitted from the region is increased. Therefore, the luminance of the region is excessively increased and the luminance uniformity is liable to decrease. If the angle ρ is larger than the angle α, the light incident on the light deflecting element 24 is not reflected by the inner surface of the facet, but only the refractive effect and the component of the light appear. If the composition is too large, the extraordinary light emission in the oblique direction in the vicinity of the light incident end face will become conspicuous. Further, if the degree of inclination of the inclination angle distribution is equal to or greater than 2 〇. If the ratio of the components is too large, the light incident on the light deflecting element 24 is not reflected by the inner surface of the prism surface, but is only subjected to refraction and the light emitting component is excessive, and the oblique light in the vicinity of the light incident end surface will be emitted. Become conspicuous. Therefore, in the present invention, the light exiting state in which the center portion of the disk is the same or close to the vicinity of the light incident end face is obtained, and the angles θ1 and θ2 and the average tilt angle are set as the range, and the tilt angle of the tilt angle is further Is greater than or equal to 20. The range of the existence ratio of the components is within the above-mentioned specific range, and the brightness of the component is uniform red _ the generation of the special outgoing light in the oblique direction of the vicinity of the light-emitting end face. ~ Light deflecting element 24' is used to accurately obtain the desired rib shape, to obtain stable optical properties, and to suppress the wear or deformation of the top portion of the crucible when used as a light source device, and is also formed with a flat top. Part or top surface section. The situation is that the brightness of the light source device is low and the brightness of the light source device is not uniform. According to the viewpoint of 37 1320121, it is preferable to set the width of the flat portion or the top surface portion to be less than or equal to 3 handsome. Sticking to it? I wilderness 疋 set the top flat surface or top curved surface = ;:, and more preferably set to less than or equal to - for example, fluorescent ΜΑ 5 extends in the Y direction of the linear light source, and can be used - human passive 21 In Fig. 8, the cake provided on the side end surface and the side end surface on the side of one side of the light guide body 23 are provided. As the "second light, ^ _ ^ ^ money placed on the reverse side

人九/原21，可使用發光二極管（LED) 等點狀之光源，_可使用將複數她狀光源以適當間隔而配置者。For the Nine/Original 21, a point-like light source such as a light-emitting diode (LED) can be used, and _ can be configured by arranging a plurality of her-shaped light sources at appropriate intervals.

光源反射罩22係將-次光源21之光以低損耗引導向導光體23者。作為其材質，可使用例如於表面具有金屬蒸鍍反射層之塑料薄膜。如騎示，光源反射罩22避開光偏向元件24 ’經由一次光源21之外面自光反射元件乃之端緣部外面向導光體23之光出射面端緣部纏繞。另一方面，光源反射罩22亦可經由一次光源21之外面自光反射元件 25之端緣部外面向光偏向元件24之出光面端緣部纏繞。可將與如此之光源反射罩22相同之反射部件付於導光體 23之光入射端面231以外之側端面。作為光反射元件25，可使用例如於表面具有金屬蒸鑛反射層之塑料薄膜。於本發明中，作為光反射元件25了亦可使用藉由金屬蒸鍍而形成於導光體23之背面234上的光反射層等，從而取代反射薄膜。本發明之導光體23及光偏向元件24可由光透過率較 38 1320121 高之合成樹脂所構成。作為如此之合成樹脂，可列舉：甲基丙烯樹脂、丙烯樹脂、聚碳酸酯樹脂、聚酯樹脂、氯化乙埽基樹脂。特別是曱基丙婦樹脂，其高光透過率、耐熱性、力學特性、成形加工性優良’故而最為合適。作為如此之曱基丙稀樹脂’係含有曱基丙烯酸甲g旨為主要成分之樹脂，較好的是甲基丙烯酸曱酯之比例為大於等於80重量 %者。於形成導光體23及光偏向元件24之粗糖面等表面馨構造或稜鏡列或雙凸透鏡列等表面構造時，可藉由使用具有所需之表面構造之構成部件將透明合成樹脂板經熱壓而形成，亦可藉由網版印刷、押出成形或射出成形等與成形同時賦予形狀。又，可使用熱或光硬化性樹脂等而形成構造面。進而，於含有聚酯樹脂、丙烯樹脂、聚碳酸酯樹脂、氯化乙烯基樹脂、聚曱基丙烯醯亞胺系樹脂等的透明薄膜或薄板等透明基材之表面，可形成含有活性能量線硬化型樹脂之粗糙面構造或透鏡列排列構造，藉由黏接、黏著等方法使如此之薄板接合一體化於另一個透明基材上。作為活性能量線硬化型樹脂，可使用多官能基（甲基）丙烯化合物、乙烯基化合物、（曱基）丙烯酸酯類、烯炳基化合物、 (甲基）丙烯酸之金屬鹽等。於含有如上所述之一次光源21、光源反射罩22、導光體23、光偏向元件24及光反射元件25而成之面光源裝置之發光面（光偏向元件25之出光面242)上，如圖9所示，配置有透過型之液晶顯示元件28，藉此構成將本發明之面光源裝置作為背光而使用的液晶顯示裝置。液晶顯示襞 39 1320121 置，由觀察者自圖9中之上方而觀察。 [實施例] 以下，藉由實施例就本發明加以進一步說明。 [實施例1] 端面5中相關說明之端面完成裳置，對作為 =光人射面2e進行域加卫，該光人射端面，由射出成形及錢口切咖獲得之橫向尺胤: mm、縱向尺寸為232.7 mm、戽声Λ 29 m >工β 板狀m厚度為2.2m之丙烯樹脂製极狀導先體2的上述尺寸為 5咖之邊。 :刀肖j加工中，以固定之轉速2〇〇〇 mm/sec並以固定 =切入量25 μιη進行7次切削。於完成切削加工中，以固定之轉^ 150 mm/sec並以5 μηι之切入量進行7次以3哗之切入量進行3次及以G μιη切人量進行7次之切削。使用所獲得之導光體，製作如圖6所示之端面照光方式面光源|置。每-個該面光源，打開—次光源1〇1，觀察稜鏡片104之上面（出光面）難時，未產生明帶/暗帶及斜光（參照下述之表一）。 [實施例2至4及比較例1至3] 除了以如表一所揭示之方式，將作為完成切削切削工具12及粗切削刀具丨4之鑽石切削工具之間隙角D1、傾斜角D2及前端之曲率半徑R分別進行變更外，以與實施例 1相同之方式製造導光體，使用該導光體製作面光源裝置。母個所獲得之面光源裝置，以與實施例1相同之方式觀察稜鏡片104之上面（出光面）1〇41)時，得到如圖1所 1320121 示之結果。表一間隙角D1 (度）傾斜角D2 (度）前端（μιη ) 明帶/暗帶產生斜光產生實施例 1 3.5 4 3 無無實施例 2 4.5 4 5 無無實施例 3 3 4 1.5 無無實施例 4 3 6 3 無無比較例 1 5 4 3 產生明帶無比較例 2 2 4 3 產生明帶無比較例 3 3 10 3 無有 [實施例5] 於本實施例中，製造由圖8至圖12之實施形態所說明之導光體及使用該導光體之面光源裝置。使用玻璃珠對經過最終鏡面加工之有效面積為230 mm><290 mm、厚度為3 mm之不錄鋼板的整個表面進行鼓風處理。另一方面，藉由切削加工於經過最終鏡面加工之有效面積為230 mm><290 mm、厚度為3 mm之其他不錄鋼板之表面上轉印面，該轉印面用以轉印形成連設有頂角為 100°、頂部前端曲率半徑為15 μιη、間隙為50 μιη的稜鏡列形成面。 41 1320121 ▲以由上述方式所獲得之2個構成部件而進行透明丙歸樹脂之射出成形，並獲得導光原料，該導光原料為23〇 :290 mm之長方形，且厚度自一方之長邊侧向他方之長邊。側為2.2 mm至〇.7職的連續變化之楔形（楔角= 0.37 )’且-方之主面祕，他方之主面為稜鏡列形成面。使用切削機於與主面平行之方向上，對與該導光材料 ^長度為290 mm之邊（長邊）相對應之一方之侧端面（厚，為2.2 mm之側端面）進行切削加工，並使其粗面化。措此’形成光人射端面，域得導細，該導光體具有：· 含有導光原料之粗面化主面之光出射面及含有導光原料之稜鏡列形成面之背面（稜鏡列延伸於與光入射端面大致垂直之方向）。光入射端面與光出射面所形成之角度θι為 88.9 ’光入射端面與背面所形成之角度们為则。。於導光體大致厚度方向上測定所獲得之導光體之光入射端面的表面粗糖度。、測定時’使用超深度形狀測定顯微鏡⑽丫腹^會社製造之VK_85GG[商品名])。首先，収導光體23之光入射^面231之大致導光體高度方向的中心線平均粗縫度 Ra及十點平均粗糙度&，並讀取測定翻内之以士。使用100倍物鏡。關於該測定範圍，根據濾波條件（單純平均土2)而提取導光體高度方向之剖面形狀，求出各測定點之傾斜角之絕對值，平均化後得到平均傾斜角如。再者，於該測定條件下-次可測定之範圍為11〇叫左右，故而於除去導光體光入射端面之導光體厚度方向之兩端的 42 1320121 50 μιη之區域中，以等間隔進行5處測定，求得各參數之平均值。結果於表二中表示。以對向於導光體23之光入射端面231之方式，沿導光度方向配置含有陰齡之—次光源，並由光源反The light source reflector 22 guides the light of the secondary light source 21 to the light guide body 23 with low loss. As the material thereof, for example, a plastic film having a metal vapor-deposited reflective layer on its surface can be used. As shown in the figure, the light source reflector 22 is slid away from the light deflecting element 24' via the outer surface of the primary light source 21 from the outer edge of the light reflecting element and the light emitting surface end edge of the light guiding body 23. On the other hand, the light source reflector 22 may be wound from the outer surface of the end surface of the light reflecting element 25 to the outer edge of the light exiting surface of the light deflecting element 24 via the outer surface of the primary light source 21. The reflection member similar to the light source reflection cover 22 can be applied to the side end surface other than the light incident end surface 231 of the light guide body 23. As the light reflecting member 25, for example, a plastic film having a metal vaporized reflective layer on its surface can be used. In the present invention, as the light reflecting element 25, a light reflecting layer or the like formed on the back surface 234 of the light guiding body 23 by metal vapor deposition may be used instead of the reflecting film. The light guide body 23 and the light deflecting element 24 of the present invention can be composed of a synthetic resin having a light transmittance higher than that of 38 1320121. Examples of such a synthetic resin include a methyl propylene resin, an acrylic resin, a polycarbonate resin, a polyester resin, and an acetyl chloride-based resin. In particular, mercapto-propyl resin is most suitable for its high light transmittance, heat resistance, mechanical properties, and moldability. The mercapto acryl resin as described above is a resin containing a mercapto methacrylate as a main component, and preferably a ratio of decyl methacrylate is 80% by weight or more. When forming a surface structure such as a surface of a light guide body 23 and a roughened surface of the light deflecting element 24, or a surface structure such as a tangent or a lenticular lens array, the transparent synthetic resin sheet can be passed through using a constituent member having a desired surface structure. It is formed by hot pressing, and can be imparted with shape by screen printing, extrusion molding, or injection molding. Further, a structural surface can be formed by using a heat or a photocurable resin or the like. Further, an active energy ray can be formed on the surface of a transparent substrate such as a transparent film or a thin plate containing a polyester resin, an acrylic resin, a polycarbonate resin, a chlorinated vinyl resin, a polyacrylonitrile acrylonitrile-based resin, or the like. The rough surface structure or the lens array structure of the hardened resin is such that the thin plate is joined and integrated on the other transparent substrate by adhesion, adhesion, or the like. As the active energy ray-curable resin, a polyfunctional (meth) propylene compound, a vinyl compound, a (mercapto) acrylate, an enebyl compound, a metal salt of (meth)acrylic acid, or the like can be used. On the light-emitting surface (light-emitting surface 242 of the light deflecting element 25) of the surface light source device including the primary light source 21, the light source reflector 22, the light guide 23, the light deflecting element 24, and the light reflecting element 25 as described above, As shown in FIG. 9, a transmissive liquid crystal display element 28 is disposed, thereby constituting a liquid crystal display device using the surface light source device of the present invention as a backlight. The liquid crystal display 襞 39 1320121 is viewed by the observer from above in Fig. 9. [Examples] Hereinafter, the present invention will be further described by way of examples. [Embodiment 1] The end face of the end face 5 is finished, and the field is protected as a light human face 2e, which is obtained by injection molding and a rectangular ruler: mm The longitudinal dimension is 232.7 mm, the humming sound is 29 m > the above-mentioned size of the polar conductive precursor 2 made of acrylic resin having a thickness of 2.2 m is a side of 5 coffee. : In the machining of the knife j, the cutting was performed 7 times at a fixed rotation speed of 2 〇〇〇 mm/sec and at a fixed = cutting amount of 25 μm. In the completion of the cutting process, the cutting was performed at a fixed rotation of 150 mm/sec and at a cutting rate of 5 μηι 7 times, 3 times with a cutting amount of 3哗, and 7 times with a G μιη cutting amount. Using the obtained light guide body, an end face illumination type surface light source shown in Fig. 6 was produced. For each of the surface light sources, the primary light source 1〇1 is turned on, and when the upper surface (light emitting surface) of the cymbal 104 is difficult, no bright band/dark band and oblique light are generated (refer to Table 1 below). [Examples 2 to 4 and Comparative Examples 1 to 3] In addition to the manner as disclosed in Table 1, the clearance angle D1, the inclination angle D2, and the front end of the diamond cutting tool which is used to complete the cutting tool 12 and the rough cutting tool 丨4 A light guide was produced in the same manner as in Example 1 except that the curvature radius R was changed, and a surface light source device was produced using the light guide. When the surface light source device obtained by the mother was observed in the same manner as in the first embodiment (the light exiting surface 1〇41), the result shown in Fig. 120122 was obtained. Table 1 Gap angle D1 (degrees) Inclination angle D2 (degrees) Front end (μιη) Bright band/dark band produces oblique light Generation Example 1 3.5 4 3 No Example 2 4.5 4 5 No Example 3 3 4 1.5 No Example 4 3 6 3 No Comparative Example 1 5 4 3 Production of bright band No comparative example 2 2 4 3 Production of bright band No comparative example 3 3 10 3 No [Example 5] In the present example, manufacturing was carried out 8 to the light guide described in the embodiment of Fig. 12 and a surface light source device using the same. The entire surface of the unrecorded steel sheet having an effective area of 230 mm ><290 mm and a thickness of 3 mm subjected to final mirror processing was subjected to air blowing treatment using glass beads. On the other hand, the transfer surface is transferred to form a transfer surface by cutting and processing on the surface of the other non-recorded steel sheet having an effective area of 230 mm > 290 mm and a thickness of 3 mm. There is a tantalum forming surface with a apex angle of 100°, a top end radius of curvature of 15 μm, and a gap of 50 μm. 41 1320121 ▲The transparent acryl resin was injection-molded by the two components obtained in the above manner, and a light guiding material was obtained. The light guiding material was a rectangular shape of 23 〇:290 mm, and the thickness was from the long side of one side. Sideways to the other side of the other side. The side is a continuously varying wedge shape (wedge angle = 0.37) from 2.2 mm to 〇.7 and the main face of the square is secret. Using a cutting machine in a direction parallel to the main surface, the side end surface (thickness, 2.2 mm side end surface) corresponding to the side (long side) of the light guiding material having a length of 290 mm is cut, And make it rough. In this way, the light-emitting end surface is formed to have a fine guide. The light guide body has: a light-emitting surface containing a roughened main surface of the light-guiding material and a back surface of the tantalum-forming surface containing the light-guiding material (edge) The mirror array extends in a direction substantially perpendicular to the light incident end surface). The angle θι formed by the light incident end surface and the light exit surface is 88.9 ′. The angle formed by the light incident end surface and the back surface is as follows. . The surface roughness of the light incident end face of the obtained light guide body was measured in the thickness direction of the light guide. At the time of measurement, the ultra-depth shape measuring microscope (10) was used to make VK_85GG [trade name] manufactured by the company. First, the center line of the light incident surface 231 of the light guide body 23 is substantially the average slit degree Ra of the height direction of the light guide body and the ten point average roughness & and the inside of the measurement is read. Use a 100x objective. With respect to the measurement range, the cross-sectional shape of the light guide in the height direction is extracted based on the filter condition (simple average soil 2), and the absolute value of the inclination angle of each measurement point is obtained, and after averaging, the average inclination angle is obtained. Further, in the measurement condition, the range which can be measured once is about 11 〇, and therefore, in the region of 42 1320121 50 μηη at both ends of the thickness direction of the light guide body where the light incident end face of the light guide is removed, at equal intervals At 5 points, the average value of each parameter was obtained. The results are shown in Table 2. The light source is incident on the end face 231 of the light guide body 23, and the sub-light source containing the aging age is disposed along the light guide direction, and is reversed by the light source.

射ίΓ,麗光會社製造之反射薄膜）而覆蓋。將光擴散反射溝膜（T〇ray社製酬[商品名])貼於其他侧端面，並且以對向於作為導光體23之棱鏡列形成面之背面234之方式而配置含有光散射亂反射薄板的光反射元件25。將上述結構組合為框體。該面光源裝置中，出射光歧分佈（χ^ 面内）之农大峰值為與光出射面法線方向成产 t 寬為22.5度。 & w 另一方面，使用折射率為1.5064之丙烯系紫外線硬化陘柯月曰製作稜鏡片，該稜鏡片一方之稜鏡面之曲率半徑為 1000 μιη之凸曲面狀，他方之稜鏡面為平面形狀，且於厚度為125 μιη之聚酯薄膜之一方之表面形成並列連接有= 數個間隙為50 μπι之棱鏡列的棱鏡列。並以以下方式載置含有所獲得之稜鏡片的光偏向元件24,即稜鏡列形成面面向上述導光體23之光出射面（褪光面）233侧，並於導光體23之光入射端面231中與稜鏡列之邊緣線平行，且各棱鏡列之平面狀稜鏡面面向導光體23之光入射端面23 j。進而，將液晶顯示元件（LED)配置於光偏向元件24 關於以上述方式所獲得之面光源裝置，點亮一次光源 21以目視觀察發光面後，未發現自導光體光入射面233沿 43 1320121 X方向30mm之區域内的亮斑或於導光體光入射端面233 之附近之斜方向之特殊光出射。圖15中表示面光源裝置的法線亮度之測定結果。法線亮度隨著向導光體光入射端面231方向前進而逐漸降低，於如此之亮度分佈之情形時並未發現亮斑。 [實施例6] 除於藉由用以使對應於導光原料之長邊的一方侧端面粗面化之切削機進行切削加工時，僅改變切削工具之角度以外，與實施例5以相同之方式獲得面光源裝置。導光體中，光入射端面與光出射面所成之角度Θ1為 88.7°，光入射端面與背面所成之角度θ2為90.3。。關於所得之面光源裝置，點亮一次光源21以目視觀察發光面後，未發現自導光體光入射面233沿X方向30 mm 區域内的亮斑或於導光體光入射端面233之附近之斜方向之特殊光出射。圖16表示面光源裝置之法線亮度之測定結果。法線亮度隨著向導光體光入射端面231方向之前進而逐漸降低，於如此之亮度分佈之情形時並未發現亮斑。再者，導光體的光入射端面之平均傾斜角0a、傾斜角大於等於20。之成分之存在比率、Ra&Rz，均與實施例5 相同。 [實施例7至9] 除於藉由用以使對應於導光原料之長邊的一方側端面粗面化之切削機進行切削加工時，僅改變切削工具之角度 44 1320121 以外’與實施例5以相同之方式獲得面光源裝置。導光體，光入射端面與光出射面所成之角度Θ1為 88.5° (實施例7)、88 3 (實施例8)。、89.1。（實施例9)，光入射端面與背面所成之角度Θ2為90.7。（實施例7)、9〇.8。 (實施例8)、89.9。（實施例9)。Covered by a reflective film made by Liguang Club. The light-diffusing reflection groove film (trade name, manufactured by T〇ray Co., Ltd.) is attached to the other side end surface, and is disposed so as to be opposite to the back surface 234 of the prism array forming surface of the light guide body 23 The light reflecting element 25 of the thin plate is reflected. The above structures are combined into a frame. In the surface light source device, the peak of the agricultural output of the outgoing light distribution (inside the surface) is a width of 22.5 degrees from the normal direction of the light exit surface. & w On the other hand, a ruthenium sheet having a refractive index of 1.5064 is used to produce a ruthenium sheet having a radius of curvature of 1000 μm on one side of the enamel sheet, and a square shape on the other side. And on the surface of one of the polyester films having a thickness of 125 μm, a prism column having a plurality of prism columns having a gap of 50 μm was formed in parallel. And the light deflecting element 24 containing the obtained ruthenium sheet is placed in such a manner that the yam formation surface faces the light exit surface (fading surface) 233 side of the light guide body 23, and the light is guided to the light guide body 23 The incident end surface 231 is parallel to the edge line of the matrix, and the planar surface of each prism array is incident on the light incident end face 23j of the light guide 23. Further, the liquid crystal display element (LED) is disposed on the light deflecting element 24. The surface light source device obtained as described above is used to illuminate the primary light source 21 to visually observe the light emitting surface, and the self-light guiding light incident surface 233 is not found along the boundary 43. 1320121 A bright spot in a region of 30 mm in the X direction or a special light in an oblique direction in the vicinity of the light incident end surface 233 of the light guide is emitted. Fig. 15 shows the measurement result of the normal brightness of the surface light source device. The normal brightness gradually decreases as the light incident light incident end face 231 advances, and no bright spot is found in the case of such a luminance distribution. [Embodiment 6] When cutting is performed by a cutting machine for roughening one end surface corresponding to the long side of the light guiding material, the angle is the same as that of the fifth embodiment except that the angle of the cutting tool is changed. The method of obtaining a surface light source device. In the light guide, the angle Θ1 between the light incident end surface and the light exit surface is 88.7°, and the angle θ2 between the light incident end surface and the back surface is 90.3. . In the obtained surface light source device, after the primary light source 21 was turned on to visually observe the light-emitting surface, no bright spot in the region of 30 mm in the X direction from the light guide light incident surface 233 or near the light incident end surface 233 of the light guide was observed. The special light in the oblique direction is emitted. Fig. 16 shows the measurement result of the normal brightness of the surface light source device. The normal brightness gradually decreases as the light beam is incident on the end face 231, and no bright spot is found in the case of such a brightness distribution. Further, the light incident end surface of the light guide has an average tilt angle 0a and an inclination angle of 20 or more. The ratio of the components present, Ra & Rz, were the same as in Example 5. [Examples 7 to 9] When cutting is performed by a cutting machine for roughening one end surface corresponding to the long side of the light guiding material, only the angle of the cutting tool 44 1320121 is changed' and the embodiment 5 The surface light source device was obtained in the same manner. The light guide body had an angle Θ1 of 88.5° (Example 7) and 88 3 (Example 8). , 89.1. (Example 9) The angle Θ2 between the light incident end surface and the back surface was 90.7. (Example 7), 9〇.8. (Example 8), 89.9. (Example 9).

關於所獲得之面光源裝置，點亮一次光源21以目視觀察發光面後’幾乎未發現自導光體光入射面233沿X方向 30 mm區域内得亮斑或於導光體光入射端面233之附近之斜方向之特殊光出射。於圖17 (實施例7)、圖18 (實施例8)及圖19 (實施例#9)中表示面光源裝置法線亮度之測定結果。法線亮度隨著向導光體光入射端面231前進而逐漸降低 *於如此之亮度分佈之情形時幾乎未發現亮斑。再者’導光體光入射端面之平均傾斜角如、傾斜角大於等之成'刀存在比率、Ra&Rz，均與實施例5相同。 [比較例4至6] -面使對應於導光原料之長邊的-方側端面粗面化之切削機進行切削加I時，改變切削工具之角度以外’ m相同之方式獲得面光源裝置。本入(較例）87·7。（比較例6)， t入射k面與Μ所成之角度θ2為9(^比㈣〇 9。 (比較例5)、91.〇。（比較例6)。 · 關於所得之面光源裝置，點亮—次光源21以目視觀察 45 1320121 ，光面後’未發現自導光體光入射面233沿χ方向3〇mm 區域内的焭斑或於導光體光入射端面233之附近之斜方向之特殊光出射。於圖20 (比較例4)、圖21 (比較例5)及圖22 (比較例6)中表示面光源裝置法線亮度之測定結果。法線亮度隨著向導光體光入射端面231方向之前進而以較大變化率產生變化，於如此之亮度分佈之情形時發現亮斑。再者，導光體光入射端面之平均傾斜角0a、傾斜角大於等於20。之成分存在比率、Ra及Rz，均與實施例5相同。_ [實施例10] 除於藉由用以使對應於導光原料之長邊的一方側端面粗面化之切削機進行切削加工時，將完成切削之切削速度變為較慢之速度以外，與實施例5以相同之方式獲得面光源裝置。以與實施例5相同之方式獲得之導光體光入射端面之平均傾斜角0a、傾斜角大於等於2〇。之成分存在比率、Ra及RZ之測定結果表示於表二。關於所獲得之面光源裝置，點亮一次光源21以目視觀 · 察發光面後，未發現自導光體光入射面233沿X方向30 mm區域内的亮斑或於導光體光入射端面233之附近之斜方向之特殊光出射。 [實施例11] 除於藉由用以使對應於導光原料之長邊的一方側端面粗面化之切削機進行切削加工時’將完成切削之切削速度變為較快之速度以外，與實施例5以相同之方式獲得面光 46 1320121 源裝置。與實施例5相同之方式獲得之導光體光入射端面之平均傾斜角ea、傾斜角大於等於2G。之成分存在比率、 Ra及RZ之測定結果表示於表二。關於所獲％之面光源裝置，點亮一次光源21以目視觀察發光面後，幾乎未發現自導光體光入射面233沿χ方向 30 mm區域内的亮斑或於導光體光入射端面233之附近之斜方向之特殊光出射。 ^ [比較例7] 除於藉由用以使對應於導光原料之長邊的一方侧端面粗面化之切削機進行切削加工時，將完成切削之切削速度變為非甲慢之速度以外，與實施例5以相同之方式獲得面光源裝置。與實施例5以相同方式獲得之導光體光入射端面之平均傾斜角0a、傾斜角大於等於20。之成分存在比率、Ra及RZ之測定結果表示於表二。關於所得之面光源裝置，點亮一次光源21以目視觀察發光面後’發現自導光體光入射面233沿X方向30 mm區 • 域内的亮度較其他部分暗，並成為暗帶，且亮度均勻度較低。又’發現於導光體光入射端面233之附近之斜方向之特殊光出射。 [比較例8] 除於错由用以使對應於導光原料之長邊的一方側端面粗面化之切削機進行切削加工時，將完成切削之切削速度變為非常快之速度以外，與實施例5以相同之方式獲得面光源裝置。以與實施例5相同之方式獲得之導光體光入射 47 1320121 =面^平均傾斜角0a、傾斜角大於等於加。之成分存在比率、Ra及Rz之測定結果表示於表^ 察發=獲面光源裝置，點亮一次光源21 以目視觀彳發現自導光體光入射面233沿x方向30mm =内的亮度較其他部分高，並成為明帶，且亮度均句度較低。表二平均傾斜角0a f Μ ------ 實施例5 ---- R A 實施例 10 實施例 11 比較例7 比較例8 傾斜角大於等於20。之成分之存在比率 (%) RaTim) —^__ 5.0 11.0 2.9 18.0 18.0 12.0 22.0 16.0 55.0 Rz (μιη) ---- 0.21 0.28 0.15 0.48 1.03 0.90 1.40 0.68 2.10 品位（亮度分佈）良好良好良好 ^光入射端面附光入射端面附 3/T- ΘΗ ^ 品位（特殊光出射）無無基本上無有無 —雖然本發明已以較佳實施例揭露如上，然、其並非用以鲁限，本發明’任何熟習此技藝者’在不脫離本發明之精神和範圍内，當可作些許之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。【圖式簡單說明】圖1係用以說明本發明中之面光源裝置用導光體之製造方法之實施中所使用的端面切削加工裝置之一實施形態之模式結構圖。 ~ 48 1320121 圖2係圖1裝置之立體模式圖。圖3表示導光體與元成切削刀具及袓切削刀具之位置關係之模式圖。圖4係藉由刀具支持位置交替方法之粗切削刀具之位置交替與粗切削加工及完成切削加工之說明圖。圖5係完成切削刀具之形態特徵之說明圖。圖6係端面照光方式之背光之立體圖。With respect to the obtained surface light source device, after the primary light source 21 is turned on to visually observe the light-emitting surface, it is hardly found that the self-light-guide light incident surface 233 has a bright spot in the region of 30 mm in the X direction or the light incident end surface 233 of the light guide. The special light in the oblique direction in the vicinity is emitted. The measurement results of the normal brightness of the surface light source device are shown in Fig. 17 (Example 7), Fig. 18 (Example 8), and Fig. 19 (Example #9). The normal brightness gradually decreases as the light beam incident end surface 231 advances. * In the case of such a luminance distribution, almost no bright spots are found. Further, the average inclination angle of the light incident end face of the light guide body is, for example, the inclination angle is larger than that of the 'knife existence ratio, Ra & Rz, and is the same as that of the fifth embodiment. [Comparative Examples 4 to 6] - A surface light source device was obtained in the same manner as the angle of the cutting tool was changed by cutting the cutting machine corresponding to the surface of the long side of the light guiding material to be roughened. . This entry (comparative example) 87·7. (Comparative Example 6), the angle θ2 between the incident x-plane and the Μ was 9 (^ ratio (4) 〇 9. (Comparative Example 5), 91. 〇 (Comparative Example 6). Illuminating—the secondary light source 21 is visually observed 45 1320121, and after the smooth surface, the eclipse in the region of 3 mm in the x-direction of the light guide light incident surface 233 or the vicinity of the light incident end surface 233 of the light guide is not found. The special light of the direction is emitted. The measurement results of the normal brightness of the surface light source device are shown in Fig. 20 (Comparative Example 4), Fig. 21 (Comparative Example 5), and Fig. 22 (Comparative Example 6). Normal brightness follows the light guide body The light incident on the end face 231 is further changed by a large change rate, and a bright spot is found in the case of such a brightness distribution. Further, the light incident light incident end face has an average tilt angle 0a and a tilt angle of 20 or more. The ratio of existence, Ra, and Rz are the same as in the case of Example 5. [Example 10] In addition to cutting by a cutting machine for roughening one end surface corresponding to the long side of the light guiding material, The same manner as in Embodiment 5 except that the cutting speed at which the cutting was completed was changed to a slower speed The surface light source device was obtained in the same manner as in Example 5. The average tilt angle 0a and the tilt angle of the light incident end surface of the light guide body were 2 Å or more. The measurement results of the component presence ratio, Ra and RZ are shown in Table 2. With respect to the obtained surface light source device, after the primary light source 21 was turned on to visually observe the light-emitting surface, no bright spot in the region of 30 mm in the X direction from the light guide light incident surface 233 or the light incident end face of the light guide was observed. Special light is emitted in the oblique direction in the vicinity of 233. [Embodiment 11] When cutting is performed by a cutting machine for roughening one end surface corresponding to the long side of the light guiding material, the cutting will be completed. The surface light 46 1320121 source device was obtained in the same manner as in Example 5 except that the cutting speed became a faster speed. The average tilt angle ea and the tilt angle of the light incident end face of the light guide body obtained in the same manner as in Example 5 were larger than The measurement results of the component presence ratio, Ra and RZ are shown in Table 2. With respect to the obtained surface light source device, the primary light source 21 was turned on to visually observe the light-emitting surface, and almost no light incident from the light guide was observed. 233 A bright spot in the region of 30 mm in the x-direction or a special light in the oblique direction near the light-incident end face 233 of the light guide body. ^ [Comparative Example 7] In addition to being used to make the corresponding material of the light guiding material The surface light source device was obtained in the same manner as in Example 5 except that the cutting speed at which the one end side surface was roughened was subjected to the cutting process, and the cutting speed at which the cutting was completed was changed to a non-a slow speed. The average tilt angle 0a and the tilt angle of the light incident end face of the light guide body obtained by the method are 20 or more. The measurement results of the component presence ratio, Ra and RZ are shown in Table 2. With respect to the obtained surface light source device, the primary light source 21 is lit. After visually observing the light-emitting surface, it was found that the self-light-guide light incident surface 233 was 30 mm in the X direction. The brightness in the region was darker than other portions, and became a dark band, and the brightness uniformity was low. Further, special light which is observed in the oblique direction in the vicinity of the light incident end surface 233 of the light guide is emitted. [Comparative Example 8] When cutting is performed by a cutting machine for roughening one end surface corresponding to the long side of the light guiding material, the cutting speed at which the cutting is completed becomes a very fast speed, and Embodiment 5 obtained the surface light source device in the same manner. The light guide light incident obtained in the same manner as in the embodiment 5 is the same as the average tilt angle 0a and the tilt angle is equal to or greater than the plus. The measurement results of the component presence ratio, Ra, and Rz are shown in Table 1. The surface light source device is illuminated, and the primary light source 21 is illuminated to visually observe the brightness of the self-light guide light incident surface 233 in the x direction of 30 mm = The other parts are high and become bright bands, and the brightness is lower. Table 2 Average tilt angle 0a f Μ ------ Example 5 - R A Example 10 Example 11 Comparative Example 7 Comparative Example 8 The tilt angle is 20 or more. The ratio of the composition (%) RaTim) —^__ 5.0 11.0 2.9 18.0 18.0 12.0 22.0 16.0 55.0 Rz (μιη) ---- 0.21 0.28 0.15 0.48 1.03 0.90 1.40 0.68 2.10 Grade (brightness distribution) Good and good ^Photoinjection End face light incident end face attached 3/T- ΘΗ ^ grade (special light exit) Nothing is essentially none - although the invention has been disclosed above in the preferred embodiment, however, it is not intended to be used as a limitation, the invention It will be apparent to those skilled in the art that the invention may be modified and modified without departing from the spirit and scope of the invention, and the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an embodiment of an embodiment of an end face cutting apparatus used in the method of manufacturing a light guide for a surface light source device according to the present invention. ~ 48 1320121 Figure 2 is a perspective view of the device of Figure 1. Fig. 3 is a schematic view showing the positional relationship between the light guide body and the element cutting tool and the boring tool. Fig. 4 is an explanatory view showing the alternate position of the rough cutting tool and the rough cutting process and the completion of the cutting process by the tool support position alternate method. Fig. 5 is an explanatory view showing the morphological characteristics of the cutting tool. Fig. 6 is a perspective view of the backlight of the end face illumination mode.

圖7係表示藉由稜鏡片而產生之光偏向情況之圖。圖8係表示使用有本發明之面光源裝導光源裝置之一實施形態的立體模式圖。圖9係圖8面光源裝置之部分剖面圖。圖10係導光體之部分放大刮面圖。圖11係導光體之部分放大剖面圖。圖12表示域向元件中之光偏向情況之模式圖。㈣自自導光體光出射面特別是光入射端面戈附近區域的光出射情況的模式圖。圖？示自光偏向元件出光面特別是導光體光入射知面之附近區域的光出射情況之模式圖。示面光源裝置之法線亮度測定結果的圖。圖16係表示面光職置之法線亮度測定結果的圖。圖Π係表示面光源裝置之法線亮度測定結果的圖。圖18係表示面光源裂置之法線亮度測定結果的圖。圖19係表:面光源裝置之法線亮度測定結果的圖。圖20係表示面光源裝置之法線亮度測定結果的圖。 49 1320121 圖21係表示面光源裝置之法線亮度測定結果的圖。圖22係表示面光源裝置之法線亮度測定結果的圖。【主要元件符號說明】 2 :導光體 2a :主面 2b :背面 2c、2d、2e、2f :端面 4:背板 4a :伺服馬達 4b:皮帶 4c :螺桿軸 6:導執 8:刀架支持部 8a :母螺栓部件 8b :伺服馬達 8c :圓頭螺桿軸 10 :刀架 10a :扣合部件 10b :刀具支持位置交替機構 12 :完成切削刀具 14 :粗切削刀具 20 :控制部 R:曲率半徑 D1 :間隙角 1320121 D2 :傾斜角 101 :線狀一次光源 102 :反射罩 104 :棱鏡片 104a :下面（入光面） 104b :上面（出光面） 105 :光反射薄膜 21 : —次光源 22 :光源反射罩 23 :導光體 231 :光入射端面 232 :側端面 233 :光出射面 234 :背面 24 :光偏向元件 241，242 主面 25 :光反射元件 28 :液晶顯示元件 d:最大距離 Θ1、Θ2 :角度 Θ3 :楔角 231a :透鏡面 P :間距 R :曲率半徑 51 1320121 Φ :頂角 α:光出射率 β :峰值光與光出射面233形成角度 γ :峰值光與光出射面233形成角度Fig. 7 is a view showing a state of light deflection caused by a cymbal. Fig. 8 is a perspective view showing an embodiment of a light source-mounted light source device according to the present invention. Figure 9 is a partial cross-sectional view showing the surface light source device of Figure 8. Figure 10 is a partial enlarged plan view of the light guide. Figure 11 is a partially enlarged cross-sectional view of the light guide. Figure 12 is a schematic diagram showing the state of light deflection in the domain element. (4) A pattern diagram of the light exiting from the light guiding surface of the self-guided light, particularly in the vicinity of the light incident end face. Figure? A schematic view showing the light emission from the light-emitting surface of the light deflecting element, particularly in the vicinity of the light incident light incident surface. A graph of the normal brightness measurement result of the surface light source device. Fig. 16 is a view showing the result of normal brightness measurement of the face light position. The figure is a diagram showing the result of normal brightness measurement of the surface light source device. Fig. 18 is a view showing the result of normal luminance measurement of the surface light source splitting. Fig. 19 is a view showing the result of normal luminance measurement of the surface light source device. Fig. 20 is a view showing the result of normal luminance measurement of the surface light source device. 49 1320121 Fig. 21 is a view showing the result of normal luminance measurement of the surface light source device. Fig. 22 is a view showing the result of normal luminance measurement of the surface light source device. [Description of main components] 2: Light guide 2a: Main surface 2b: Back surface 2c, 2d, 2e, 2f: End surface 4: Back plate 4a: Servo motor 4b: Belt 4c: Screw shaft 6: Guide 8: Tool holder Support portion 8a: female bolt member 8b: servo motor 8c: round head screw shaft 10: tool holder 10a: fastening member 10b: tool support position alternate mechanism 12: completion of cutting tool 14: rough cutting tool 20: control portion R: curvature Radius D1: clearance angle 1320121 D2: inclination angle 101: linear primary light source 102: reflector 104: prism sheet 104a: lower surface (light incident surface) 104b: upper surface (light emitting surface) 105: light reflecting film 21: - secondary light source 22 Light source reflector 23: Light guide body 231: Light incident end surface 232: Side end surface 233: Light exit surface 234: Back surface 24: Light deflecting element 241, 242 Main surface 25: Light reflecting element 28: Liquid crystal display element d: Maximum distance Θ1, Θ2: angle Θ3: wedge angle 231a: lens surface P: pitch R: radius of curvature 51 1320121 Φ: apex angle α: light exit rate β: peak light forms angle γ with light exit surface 233: peak light and light exit surface 233 angle

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Claims

1320121 X. Patent application scope: 1. A method for manufacturing a light guide body for an end face illumination type surface light source device, for manufacturing light guided from a primary light source and having an incident end face for causing light emitted from a primary light source to be incident and A method of using a light guide for a surface light source device of an end face illumination type light-emitting surface that emits light by a guided light is characterized in that a material made of a translucent synthetic resin is used as a material of the light guide body, and a gap angle is used. The light incident end surface is a cutting process of a cutting tool of 3 degrees or more, 45 degrees or less, and an inclination angle of 8 degrees or less. 2. The method for manufacturing an end face illumination method according to item i of the patent application scope, wherein the inclination angle of the cutting tool is the end face illumination method of the apparatus 3 using the m-part method (4), and the surface light source rate is half == method 'The curved horse at the front end of the above cutting tool is greater than or equal to 1.5 pm and less than or equal to 6 μιη. The method for producing a light guide according to any one of the above-mentioned items, wherein the light-weighting crystal drill is used as the oil residue. Light guide for the device: the surface light source of the end face illumination method is obtained. The average particle size is 4=3. The above-mentioned sintered polycrystalline diamond particles are equal to 0.3 handsome and less than or equal to 3 〇. Further, it has a light incident end surface for emitting light from the secondary light source, a light incident end surface into which the emitted light is emitted, a light exit surface for emitting light guided by 53 1320121, and an end face illumination method surface made of a translucent synthetic resin. In the cutting tool for cutting the light incident end surface when the light guide for the light source device is used, the cutting tool has a clearance angle of 3 degrees or more and 4.5 degrees or less, and the inclination angle is 8 degrees or less. 7. The cutting tool according to claim 6, wherein the inclination angle is 3 degrees or more. 8. The cutting tool according to claim 6, wherein the radius of curvature of the front end is 1.5 μm or more and less than κ6 μηι. φ, 9. The cutting tool of any one of claims 6 to 8 wherein the towel uses a sintered S diamond; 5 particles are used as the fixed abrasive grains. The cutting tool according to claim 9, wherein the sintered polycrystalline diamond particles have an average particle diameter of not less than or equal to 〇 3 and less than 30 μηη. A light guide for a surface light source device is configured to guide light emitted from the secondary light source and has a light incident surface that emits light emitted from the secondary light source and a light exit surface that emits guided light and a reverse side thereof The back side is characterized in that: the light-emitting person is at the end of the above-mentioned back _ limbs is greater than or equal to 89.4 degrees, less than or equal to 91 degrees; and the end face is found, according to the ultra-depth shape of the coffee micro-mirror measurement The thickness of the button is equal to 3 degrees and less than or equal to 12A. The needle angle is greater than 12'. For the surface light device according to Item 11 of the application, the light guide 54 1320121 is the second light source, and the light incident end surface is measured according to the super-depth shape measuring the tilt angle of the microscope. The ratio of the component whose inclination angle is 2 degrees or more is 4 〇 0 / 〇. 13. The light guide body for a surface light source device according to the above aspect of the invention, wherein the light incident end surface of the light source device is measured, and the center line of the thickness direction of the light guide body is known according to the ultra-depth shape measurement microscope. The average thick chain degree Ra is 大于.2 μιη or more and 〇4 μπι or less. 14. The light guide body for a surface light source device according to the invention of claim 5, wherein the light incident end surface is an average of ten points in the thickness direction of the light guide body measured by the ultra-depth shape measurement microscope. The crude sugar content is 0.7 or more and 2 μπ1 or less. The surface light source device of any one of the above-mentioned items, wherein the light human face is a thick chain surface and is perpendicular to the thickness direction of the light guide body. a plurality of lens rows extending in parallel with each other, and a lens column forming surface including a curved line in a cross-sectional shape thereof or a plurality of lens rows extending in parallel with a direction perpendicular to a thickness direction of the light guiding body A roughened lens row forming surface formed by roughening at least a part of the lens row. 16. The light guide for a surface light source device according to claim 5, wherein the light exit surface is formed by a rough surface. The light guide for a surface light source device according to claim 5, wherein the back surface is a lens array forming surface including a plurality of lens rows extending in parallel with each other in a direction substantially perpendicular to the light incident end surface. 55