201243310 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種於製作導光板時使用之片狀之導光板 用片材或導光板之檢查裝置及檢查方法。又，本發明係關 於一種使用該檢查方法之導光板之製造方法。 【先前技術】 用作液晶顯示器之面光源之背光源有：直下型，其係將 冷陰極管或LED(發光二極體，Light Emitting Diode)等光 源於底面並列而經由光擴散板出射光；及邊緣照明型，其 係將冷陰極管或LED等光源配置於稱為導光板之透明板之 邊緣部分而藉由供光通過且設於背面之點印刷或圖案形狀 自導光板邊緣向前面出射光。迄今為止，自可提高背光源 之亮度之觀點考慮，直下型為主流，但是近年來，由於較 薄且高亮度之LED開始較多地用作光源或者由於液晶顯示 器之薄型化而邊緣照明方式之比例增加。 例如’於專利文獻卜2中揭*有藉由射出成$而製造導 光板之方法。又，作為較薄且面積較大之導光板之製造方 法，亦提出有藉由擠出成形代替射出成形而製造導光板之 於專利文獻3中，作 作為背光源用之導光板，揭示有於丙201243310 VI. Description of the Invention: The present invention relates to an inspection apparatus and an inspection method for a sheet or a light guide plate for a sheet-shaped light guide plate used in the production of a light guide plate. Further, the present invention relates to a method of manufacturing a light guide plate using the inspection method. [Prior Art] The backlight used as the surface light source of the liquid crystal display has a direct-type type in which a light source such as a cold cathode tube or an LED (Light Emitting Diode) is juxtaposed on the bottom surface to emit light through the light diffusion plate; And an edge illumination type in which a light source such as a cold cathode tube or an LED is disposed at an edge portion of a transparent plate called a light guide plate, and is printed by a light supply and is printed on a back surface or a pattern shape is directed to the front side from the edge of the light guide plate. Shoot light. Heretofore, from the viewpoint of improving the brightness of the backlight, the direct type is the mainstream, but in recent years, the thinner and high-brightness LEDs have begun to be used as a light source or because of the thinness of the liquid crystal display. The proportion increases. For example, it is disclosed in Patent Document 2 that there is a method of manufacturing a light guide plate by emitting into $. In addition, as a method of manufacturing a light guide plate having a relatively large size and a large area, a light guide plate manufactured by extrusion molding instead of injection molding is disclosed in Patent Document 3, and is disclosed as a light guide plate for a backlight. C
先行技術文獻 162426.doc 201243310 專利文獻 專利文獻1 :日本專利特開平9-1 3 1770號公報 專利文獻2 :日本專利特開2008-20747號公報 專利文獻3 :日本專利特開2001-76522號公報 【發明内容】 發明所欲解決之問題 然而’導光板有時其穿透光帶黃色調，即γι(黃色指數） 值增大。使用該種導光板構成之液晶顯示器由於圖像帶黃 色調從而無法獲得高質量之圖像。又，於導光板之透明度 降低之情形時，穿透導光板之光之穿透率降低從而圖像之 亮度降低。因此，必須進行將過度帶黃色調之導光板以及 透明度降低之導光板作為不良品排除之檢查。然而，實際 情況為該檢查係藉由目視而檢查導光板自身之黃色調及透 明度之程度，檢查效率並不高。 因此，本發明之目的在於提供一種藉由基於來自導光板 用片材或導光板之穿透光之X值或亮度值自動檢查於製作 導光板時所使用之片狀之導光板用片材或導光板自身之黃 色調或透明度之程度而可有效地檢查導光板用片材或導光 板的檢查裝置及檢查方法。 解決問題之技術手段 本發明之檢查裝置係基於藉由分光光度計測定之測定值 而檢查作為由透明樹脂構成之導光板或導光板用片材之透 明樹脂片材之黃色調及透明度之至少一者之光學特性的裝 置。該檢查裝置包括光照射機構、受光機構、記憶機構、 162426.doc 201243310 判定機構及輸出機構。光照射機構係向透明樹脂片材之端 _光。受光機構係接收由光照射機構照射而穿透透明 樹脂片材之穿透光，並檢測所接收之穿透光之χγζ色空間 中之X值及亮度值之至少—者。記憶機構包括第以憶部及 第2記憶部之至少一者。第丨記憶部係對穿透透明樹脂片材 之穿透光之ΧΥΖ色空間中之Χ值與作為藉由分光光度計測 定：測定值之透明樹脂片材之黃色指數值的第"目關關係 進行預先記憶。第2記憶部係對穿透透㈣脂片材之穿透 光之亮度值與作為藉由分光光度計测定之測定值之透明樹 脂片材之全光線穿透率的第2相關關係進行預先記憶。 判定機構包括第1判定部及第2判定部之至少一者。第i ^定部係基於預先記憶於第1記憶部中之第！相關關係，判 定與藉由受光機構檢測出之X值對應之黃色指數值是否超 過第1閲i。第2判定部係基於預先記憶於第2記憶部中之 第2相關關係，判定與藉由受光機構檢測出之亮度值對應 之全光線穿透率是否未達第2閾值。輸出機構係輸出判定 機構之判定結果。 於如此構成之檢查裝置中，可基於來自導光板用片材或 導光板之穿透光之X值或亮度值而自動檢查於製作導光板 時所使用之片狀之導光板用片材或導光板自身之黃色調或 透明度之程度。藉此’根本發明據，可有效地檢查於製作 導光板時所使用之導光板用片材或導光板。 於上述檢查裝置中亦可為記憶機構包括第1記憶部且判 定機構包括第1判定部，於第i判定部判定為與藉由受光機 I62426.doc 201243310 對應之黃色指數值超過第1間值之情形時， 號2構將表示透明樹月旨片材為過度帶黃色調之片材之信 唬作為判定結果輸出。 ^上述檢查裝置中亦可為記憶機構包括第2記憶部且判 包括第2判定部’於第2判定部判定為與藉受光機構 /見出之亮度值對應之全光線穿透率未達第2間值之情 ㈣’輸出機構將表示透明樹脂片材為透明度降低之 之k號作為判定結果輸出。 於上述檢查裝置中’亦可為記憶機構包括第1記憶部及 第2記憶部，且判定機構包括第1判定部及第2判定部。在Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. 2001-76522. SUMMARY OF THE INVENTION The problem to be solved by the invention however is that the light guide plate sometimes penetrates the yellow band of the light band, that is, the value of γι (yellow index) increases. A liquid crystal display constructed using such a light guide plate cannot obtain a high quality image due to a yellow hue of the image. Further, when the transparency of the light guide plate is lowered, the transmittance of light penetrating the light guide plate is lowered to lower the brightness of the image. Therefore, it is necessary to perform inspection of the light guide plate with excessive yellow adjustment and the light guide plate with reduced transparency as a defective product. However, the actual situation is that the inspection checks the degree of yellowness and transparency of the light guide plate by visual inspection, and the inspection efficiency is not high. Therefore, an object of the present invention is to provide a sheet for a light guide plate which is used for the production of a light guide plate by using an X value or a brightness value based on light transmitted from a sheet for a light guide plate or a light guide plate or The inspection device and the inspection method for the sheet for the light guide plate or the light guide plate can be effectively inspected by the degree of yellowness or transparency of the light guide plate itself. Means for Solving the Problem The inspection apparatus of the present invention inspects at least one of yellow tone and transparency of a transparent resin sheet as a light guide plate or a sheet for a light guide plate made of a transparent resin based on a measurement value measured by a spectrophotometer. A device for optical characteristics. The inspection device includes a light irradiation mechanism, a light receiving mechanism, a memory mechanism, a 162426.doc 201243310 determination mechanism, and an output mechanism. The light irradiation mechanism is directed to the end of the transparent resin sheet _ light. The light receiving means receives the transmitted light which is irradiated by the light irradiation means and penetrates the transparent resin sheet, and detects at least the X value and the brightness value in the χ ζ ζ color space of the received transmitted light. The memory mechanism includes at least one of a memory unit and a second memory unit. The second memory portion is the Χ value in the ochre space of the penetrating light passing through the transparent resin sheet and the first value of the yellow index value of the transparent resin sheet measured by the spectrophotometer: the measured value The relationship is pre-memorized. The second memory unit pre-memorizes the second correlation between the luminance value of the transmitted light penetrating through the (four) fat sheet and the total light transmittance of the transparent resin sheet as a measured value measured by a spectrophotometer. . The determination means includes at least one of the first determination unit and the second determination unit. The i-th order is based on the first memory in the first memory unit! The correlation is determined as to whether or not the yellow index value corresponding to the X value detected by the light receiving means exceeds the first reading i. The second determination unit determines whether or not the total light transmittance corresponding to the luminance value detected by the light receiving means has not reached the second threshold based on the second correlation stored in advance in the second storage unit. The output mechanism outputs the judgment result of the determination mechanism. In the inspection apparatus configured as described above, the sheet or the guide sheet for the light guide plate used in the production of the light guide plate can be automatically inspected based on the X value or the brightness value of the light transmitted from the sheet for the light guide plate or the light guide plate. The degree of yellowness or transparency of the light board itself. According to the "invention of the invention", the sheet for a light guide plate or the light guide plate used in the production of the light guide plate can be effectively inspected. In the above-described inspection apparatus, the memory means may include a first memory unit, and the determination means includes a first determination unit, and the i-th determination unit determines that the yellow index value corresponding to the photoreceiver I62426.doc 201243310 exceeds the first value. In the case of the case, the letter 2 indicates that the letter of the transparent tree sheet is an excessively yellow-colored sheet as a result of the determination. In the above inspection apparatus, the memory means may include the second memory unit, and the second determination unit may be included in the second determination unit to determine that the total light transmittance corresponding to the brightness value of the borrowing/receiving mechanism/detection is not up to the second The two values (4) 'The output mechanism will indicate that the transparent resin sheet is the k number whose transparency is reduced as the judgment result. In the above-described inspection apparatus, the memory means may include a first memory unit and a second memory unit, and the determination unit includes a first determination unit and a second determination unit. in
該構成中，於第1判定部判定為與藉由受光機構檢測出之X 值對應之黃色指數值超過第！閾值之情形時，或者於第巧 定部判定為與藉由受光機構檢測出之亮度值對應之全光線 穿透率未達第2閨值之情形時，輸出機構將表示透明樹脂 片材為過度帶黃色調或者透明度降低之不良品片材之信號 作為判定結果輸出。 上述檢查裝置亦可進而包括搬送機構，該搬送機構係沿 與光照射機構之光昭射方而1 尤"、、射方向父又之方向搬送透明樹脂片 材於《亥隋形時’光照射機構係向藉由搬送機構搬送之透 明樹脂片材之端面照射該光。 又本發明之檢查方法係基於藉由分光光度計測定之測 定值而檢查作為由透明樹脂構成之導光板或導光板用片材 之透明樹脂片材之黃色調及透明度之至少一者之光學特性 的檢查方法。該檢杳方法勿紅從& 一乃凌E栝獲取步驟、光照射步驟、受 162426.doc 201243310 光步驟、判；t步驟及輸出步驟。獲取步驟包括第i獲取步 驟及第2獲取步驟之至少一者。於第1獲取步驟中，係預先 獲取穿透透明樹脂片材之穿透光之ΧΥΖ色空間中之χ值與 作為藉由分光光度計測U之敎值之透明樹脂片材之黃 色指數值的第1相關關係。於第2獲取步驟中，係預先獲取 穿透透明樹脂片材之穿透光之亮度值與作為藉由分光光度 計測定出之測定值之透明樹脂片材之全光線穿透率的第1 相關關係 於光照射步驟中係向透明樹脂片材之端面照射光。於受 光步驟中，係接收於光照射步驟中照射至透明樹脂片材之 端面而穿透透明樹脂片材之穿透光，並檢測所接收之穿透 光之ΧΥΖ色空間中之X值及亮度值之至少一者。判定步驟 包括第1判定步驟及第2判定步驟之至少一者。於第i判定 步驟中，係基於在第丨獲取步驟中預先獲取之第丨相關關 係，判定與在受光步驟中檢測出之χ值對應之透明樹脂片 材之黃色指數值是否超過第i間值。於第2判定步驟中，係 基於在第2獲取步驟中預先獲取之第2相關關係，判定與在 受光步驟中檢測出之亮度值對應之透明樹脂片材之全光線 穿透率是否未達第2閾值。於輸出步驟中係輸出判定步驟 中之判定結果。 於如此構成之檢查方法中，可基於來自導光板用片材或 導光板之穿透光之X值或亮度值而自動檢查於製作導光板 時所使用之片狀之導光板用片材或導光板自身之黃色調或 透明度之程度藉此，根據本發明，可有效地檢查於製作 162426.doc 201243310 導光板時所使用之導光板用片付或導光板。 ::述檢查方法令亦可為獲取步驟 判定步驟包括第,判定步驟，於在：取：驟且 在受光步驟中檢測出x j_判疋為與 风叫之X值對應之黃 之情形時，係於輸出步驟中 s值超過第1間值 黃色調之片材… 透明樹脂片材為過度帶 貢色π之片材之^作為判定結果輸出。 於上述檢查方法令亦為 刹驟包括第2獲取步驟且 別疋步驟包括第2判定步驟，於扃 上， 在第2判定步驟中判定為应 在受光步驟中檢測出之亮度值 ' 〜度值對應之全光線穿透率未这篦 2間值之情形時’係於輸出步料將表示透明樹二 透明度降低之片材之信號作為判定結果輸出。 於上述檢查方法中亦可在權^ h ^ 了為獲取步驟包括第1獲取步驟及 第2獲取步驟’且判定步驟 — 栝第1判疋步驟及第2判定步 驟。在該檢查方法中，於右笛 ^ T》在第⑼定步驟巾判定為與在受 光步驟中檢測出之X值對應之黃色 / 肓色私數值超過第1閾值之情 形時’或者於在第2判定步驟中判定為與在受光步驟中檢In this configuration, the first determination unit determines that the yellow index value corresponding to the X value detected by the light receiving means exceeds the first! In the case of the threshold value, or when the first predetermined portion determines that the total light transmittance corresponding to the luminance value detected by the light receiving means does not reach the second threshold value, the output mechanism will indicate that the transparent resin sheet is excessive. A signal of a defective sheet having a yellow tone or a reduced transparency is output as a determination result. The inspection apparatus may further include a conveyance mechanism that conveys the transparent resin sheet in the direction of the light direction of the light irradiation unit, and in the direction of the father, in the direction of the father. The mechanism irradiates the light to the end surface of the transparent resin sheet conveyed by the conveying mechanism. In the inspection method of the present invention, the optical characteristics of at least one of the yellow tone and the transparency of the transparent resin sheet as the light guide plate or the light guide plate sheet made of a transparent resin are inspected based on the measured values measured by a spectrophotometer. Inspection Method. The method of inspection is not red, and the steps of obtaining light, the step of light irradiation, the step of 162426.doc 201243310, the step of determining, and the step of outputting. The obtaining step includes at least one of the ith obtaining step and the second obtaining step. In the first obtaining step, the enthalpy value in the ochre space penetrating the transparent resin sheet and the yellow index value of the transparent resin sheet as the 敎 value measured by the spectrophotometer are obtained in advance. 1 related relationship. In the second obtaining step, the first correlation between the luminance value of the transmitted light penetrating through the transparent resin sheet and the total light transmittance of the transparent resin sheet as the measured value measured by the spectrophotometer is obtained in advance. The light is irradiated to the end surface of the transparent resin sheet in the light irradiation step. In the light receiving step, the light that is irradiated to the end surface of the transparent resin sheet in the light irradiation step and penetrates the transparent resin sheet is detected, and the X value and the brightness in the color space of the received transmitted light are detected. At least one of the values. The determining step includes at least one of the first determining step and the second determining step. In the i-th determination step, based on the third correlation relationship acquired in advance in the second acquisition step, it is determined whether the yellow index value of the transparent resin sheet corresponding to the threshold value detected in the light receiving step exceeds the i-th value . In the second determination step, based on the second correlation relationship acquired in advance in the second acquisition step, it is determined whether or not the total light transmittance of the transparent resin sheet corresponding to the luminance value detected in the light receiving step is not reached. 2 threshold. In the output step, the determination result in the determination step is output. In the inspection method of the above-described configuration, the sheet or the guide sheet for the light guide plate used in the production of the light guide plate can be automatically inspected based on the X value or the brightness value of the light transmitted from the sheet for the light guide plate or the light guide plate. The degree of yellowness or transparency of the light plate itself, according to the present invention, can effectively check the sheet or the light guide plate for the light guide plate used in the production of the 162426.doc 201243310 light guide plate. The description method may be an acquisition step determination step including a first step, a determination step, in the case of: taking: and detecting, in the light receiving step, that x j_ is determined to be yellow corresponding to the X value of the wind. It is a sheet in which the s value exceeds the yellow value of the first value in the output step. The transparent resin sheet is output as a result of the judgment of the sheet having an excessive π color. The inspection method command also includes a second acquisition step for the brake and a second determination step for the step, and the second determination step determines that the brightness value should be detected in the light receiving step. When the corresponding total light transmittance is not between these two values, the signal of the sheet whose output step indicates that the transparency of the transparent tree is reduced is output as a determination result. In the above inspection method, the acquisition step may include the first acquisition step and the second acquisition step 'and the determination step - the first determination step and the second determination step. In the inspection method, when the right side flute is determined in the (9)th step towel as the yellow/blue private value corresponding to the X value detected in the light receiving step exceeds the first threshold value, or 2 in the determination step, it is determined to be checked in the light receiving step
測出之亮度值對應之全光線穿透率未達第2閾值之情形 時’係於輸出步驟中將表示透明樹脂片材為過度帶 或者透明度降低之不良品片材之信號作為判定結果輸I 上述檢查方法進而包括搬送步驟，該搬送步驟係沿與在 光照射步驟中照射之光之照射方向 乂方向搬送透明樹 脂片材。於該情形時，亦可為Α也 』為在先照射步驟中向藉由搬送 步驟搬送之透明樹脂片材之端面照射該光。 又，本發明之製造方法包括：成形步驟，其係使用特定 162426.doc 201243310 之成形方法將透明樹脂成形為透明樹脂片材；檢查步驟， 其係藉由上述任一檢查方法檢查藉由成形步驟而成形之透 明樹脂片材；及獲取步驟，其係於在檢查步驟中判定為透 明樹脂片材具有光學特性之情形時，對該透明樹脂片材進 行切削及研磨之至少一種處理從而獲取導光板。 於如此構成之製造方法中，由於可基於來自導光板用片 材或導光板之穿透光之X值或亮度值而自動檢查於製作導 光板時所使用之片狀之導光板用片材或導光板自身之黃色 調或透明度之程度，故可有效地檢查於製作導光板時所使 用之導光板用片材或導光板。如此可有效地檢查光學特 性，因此，根據本製造方法可有效地製造導光板。 上述製造方法亦可進而包括取出步驟，該取出步驟係於 在檢查步驟中判定為透明樹脂片材不具有光學特性之情形 時取出該透明樹脂片材作為不良品。又，於上述製造方法 中，亦可進而包括切斷步驟，該切斷步驟係於透明樹脂片 材為導光板用片材，且在該檢查步驟中判定為導光板用片 材具有光學特性之情形時，將導光板用片材切斷處理成特 定之矩形形狀。 發明之效果 根據本發明，藉由基於來自導光板用片材或導光板之穿 透光之X值或亮度值而自動檢查於製作導光板時所使用之 片狀之導光板用片材或導光板自身之黃色調或透明度之程 度，而可有效地檢查導光板用片材或導光板。又，根據本 發明，由於可有效地檢查導光板用片材或導光板，故可使 162426.doc 201243310 導光板之製造效率化。 【實施方式】 圖1係表示本發明之檢查裝置之構成之一實施形態之 圖。檢查裝置1係用於製作矩形板狀之導光板時之檢查之 裝置。檢查裝置1係檢查由透明樹脂構成之片狀之導光板 用片材6是否過度帶黃色調以及透明度是否降低之光學特 性。將導光板用片材6切斷為特定大小之矩形板狀，製作 導光板。導光板例如係用於作為液晶顯示器之面光源之背 光源。 導光板用片材6只要為由透明樹脂構成之片狀者則無特 別限定。透明樹脂例如除了可列舉聚氣乙烯樹脂、丙烯 腈-丁二烯-苯乙烯樹脂、低密度聚乙烯樹脂、高密度聚乙 烯樹脂、直鏈低密度聚乙烯樹脂、聚苯乙烯樹脂、聚丙烯 樹脂、丙烯腈-苯乙烯樹脂、醋酸纖維素樹脂、乙烯-醋酸 乙烯樹脂、丙烯-丙烯腈-苯乙烯樹脂、丙烯_氯化聚乙烯樹 脂、乙烯-乙烯醇樹脂 '氟碳樹脂、曱基丙烯酸曱酯樹 脂 '甲基丙烯酸甲酯·苯乙烯樹脂、聚縮醛樹脂、聚醯胺 樹脂、聚對苯二甲酸乙二醇酯樹脂、芳香族聚碳酸酯樹 脂、聚颯樹脂、聚醚砜樹脂 '甲基戊烯樹脂、聚芳酯樹 . 脂、聚對笨二甲酸丁二酯樹脂、含有含脂環結構之乙烯性 -不飽和單體單元之樹脂、聚苯硫醚樹脂、聚苯醚樹脂、聚 醚醚酮樹脂等通用或工程塑料之外，還可列舉聚氣乙烯系 彈性體、氣化聚乙稀、乙烯_丙稀酸乙酯樹脂、熱塑性聚 氨酯彈性體、熱塑性聚酯彈性體、離子聚合物樹脂、苯乙 I62426.doc •10- 201243310 烯-丁二烯嵌段聚合物、乙丙橡膠、聚丁二烯樹脂 '丙烯 酸系橡膠等橡膠狀聚合物，該等亦可使用一種或將兩種以 上組合使用。 • 於該等樹脂中，作為構成導光板用片材6之樹脂，較佳 為選自甲基丙稀酸曱醋系樹脂、苯乙稀系樹脂及芳香族聚 • 碳酸酯樹脂之樹脂。構成導光板用片材6之樹脂不僅可為 一種，亦可積層化為兩種樹脂之雙層板或兩種樹脂之三層 板。導光板用片材6例如包括於板之主層使用芳香族聚碳 酸酯樹脂且於表層積層曱基丙烯酸曱酯系樹脂者。構成導 光板用片材6之樹脂亦可為混合有第二成分者，例如亦包 括於聚碳酸酯樹脂中添加有微量甲基丙烯酸曱酯系樹脂 者。 導光板用片材6亦可係由在透明樹脂中分散有微粒子之 樹脂組成物而構成者。作為微粒子，只要係折射率與構成 導光板用片材6之透明樹脂不同之微粒子且可使穿透光擴 散者，則並無特別限定。作為微粒子，例如可列舉玻璃 珠、二氧化石夕粒子、氫氧化紹粒子、碳酸妈粒子、硫酸鎖 粒子、氧化鈦粒子、滑石粉等無機微粒子以及苯乙烯系樹 _ 脂粒子、丙烯酸系樹脂粒子等樹脂粒子等。 • 力導光板用片材6中例如亦可添加含有料線吸收劑、 熱穩定劑、抗氧化劑、耐候劑、光穩定劑、登光增白劑、 加工穩定劑等公知之各種添加劑。 導光板用片材6之厚度並無特別限定，通常為〇.〇5〜15 mm ’較佳為0.1〜1〇 mm，更佳為〇 5〜5 mm。 162426.doc .it 201243310 如上構成之導光板用片材6可利用射出成形或擠出成形 等公知之成形方法而製造（成形步驟）。於本實施形態中， 例如導光板用片材6係藉由擠出成形而製造。具體而言， 係-面將作為基材之透明樹脂利用擠壓機進行加熱而溶融 且混練，-面自模具擠出為片狀。藉由將自模具擠出之片 材體夾入至3根或4根冷卻輥52中進行冷卻而製造導光板用 片材6»導光板用片材6之寬度方向之長度Ll係根據模具之 尺寸而定，為500〜5000 mm，通常為1〇〇〇〜3〇〇〇爪爪。作為 擠壓機，例如可列舉單軸擠壓機及雙軸擠壓機。作為模 具，例如係使用T型模具。 藉由冷卻輥52冷卻之導光板用片材6係藉由檢查裝置^ 檢查（檢查步驟）。如圖丨所示，本實施形態之檢查裝置 包括光照射部2(光照射機構）、受光部3(受光機構）、控制 裝置4及搬送裝置5(搬送機構）而構成。控制裝置化括記憶 部41 '判定部42及輸出部43。檢查裝置丨係實現本實施形 態之檢查方法。具體而言，光照射部2係執行光照射步 驟。受光部3係執行受光步驟。控制裝置4之判定㈣係執 行判定步驟。控制裝置4之輸出部43係執行輸出步驟。 搬送裝置5包括複數個搬送輥51。搬送裝置“系朝向光照 射部2沿搬送方向R連續地搬送藉由冷卻輥^冷卻之導光板 用片材6(搬送步驟搬送導光板用片材6之搬送方向尺係 與導光板用.片材6之寬度方向正交。又，該搬送方向㈣與 光照射部2之光照射方向正交（交叉）。藉由冷卻觀52冷卻之 導光板用片材6為120 C以上之溫度，一面於搬送輥51上緩 162426.doc 12 201243310 慢冷卻一面朝向光照射部2搬送數10 m之距離。 光照射部2係朝向藉由搬送裝置5連續地搬送之導光板用 片材6之寬度方向（與搬送方向r正交之方向）之一端部之端 面照射光（光照射步驟）^光照射部2例如除了可使用冷陰極 管、熱陰極管等線狀光源之外，還可使用發光二極體 (LED)等點狀光源等。於本實施形態中，光照射部2例如包 括 LED。 受光部3係配置為與導光板用片材6之寬度方向之另一端 部之端面相對向β作為受光部3，可使用色彩亮度計照相 機。受光部3係接收自藉由搬送裝置5連續地搬送之導光板 用片材6之寬度方向之一端部之端面入射、且自寬度方向 之另一端部之端面出射而穿透導光板用片材6之穿透光（受 光步驟）。受光部3係檢測所接收之穿透光之ΧΥΖ色空間中 之X值（以下簡稱為「X值」）及亮度值（受光步驟）。 控制裝置4包括記憶部41(記憶機構）、判定部42(判定機 構）及輸出部43(輸出機構），控制裝置4例如可藉由個人電 腦（Personal Computer ’ PC)等實現。個人電腦包括CPU(中 央處理單元’ Central Processing Unit)、RAM(隨機存取記 憶體，Random Access Memory)及 R〇M(唯讀記憶體，Read Only Memory)等。 記憶部41包括第1記憶部41丨及第2記憶部412。第丨記憶 部4Π係預先獲取穿透導光板用片材6之穿透光之χγζ色空 間中之X值、與藉由分光光度計測定之導光板用片材6之黃 色才Θ數（ΥΙ)值的相關關係α(例如參照圖2)並進行記憶（第i 162426.doc 13 201243310 獲取步驟）。第2記憶部412係預先獲取穿透導光板用片材6 之穿透光之亮度值、與藉由分光光度計測定之導光板用片 材6之全光線穿透率的相關關係β(例如參照圖3)並進行記憶 (第2獲取步驟）。關於穿透光之X值與導光板用片材62ΥΙ 值之相關關係α、以及穿透光之亮度值與導光板用片材6之 全光線穿透率之相關關係Ρ，可根據構成導光板用片材6之 透明樹脂之種類、導光板用片材6之寬度方向之長度或厚 度等而適當變更。 此處’導光板用片材6之ΥΙ值及全光線穿透率可根據藉 由分光光度計於波長為3 80〜780 nm之範圍内以每5 nm測定 各波長之光線穿透率所得之測定結果而算出。 判定部42包括第1判定部42丨及第2判定部422。第1判定 部421係基於預先記憶於第i記憶部4 u中之相關關係α ,判 定與藉由受光部3檢測出之Χ值對應之黃色指數值是否超過 特定之閾值S,(第1判定步驟該閾值s〗係表示導光板用片 材6是否過度帶黃色調之指#。於黃色指數值大於間值S| 之情形時光板用片# 6被判定為過度帶冑色調。第2判 定部422係基於預先記憶於第2記憶部412中之相關關係β, 判定與藉由受光部3檢測出之亮度值對應之全光線穿透率 是否未達特定之閾值S2(第2判定步驟）。該間值Μ表示導 光板用片材6之透明度是否降低之指#。於全光線穿透率 低於閾值S 2之情形，Μ .k J· 時導光板用片材6被判定為透明度較 低。 輸出部43係輸出本丨宏/ 印句疋部42之判定結果之部分，其於第】 162426.doc 201243310 H421判定為黃色指數值超過特定之閾值S,之情形 時，輸出表示導光板用片材6過度帶黃色調之異m 又，輸出部43係於第2判定部似判定為上述全光線穿透率 未達特定之閾料之情料，輸出表示導光㈣片材6之 透明度降低之異常信號(輸出步驟)。作為該輸出部43,例 如可列舉發出警報聲作為異f信號之機構以及顯示「檢測 出過度帶黃色調且透明度降低之導光板用片材」等訊息作 為異常信號之機構等。 於如上構成之檢查裝置^，輸出部43係於判定為幻值 超過特疋之㈣S,之情料或者於判定為全光線穿透率未 達特定之閾值s2t情形時，冑出表示導光板用片材6過度 帶黃色調之異常信號或者表示導光板用片材6之透明度降 低之異常信號。因此，可基於來自導光板用片材6之穿透 光之X值及亮度值而自動檢查導光板用片材6自身之黃色調 及透明度之程度。藉此’根據檢查裝£1，可有效地檢查 導光板用片材6。 已藉由檢查裝置1檢查之導光板用片材6係藉由搬送裝置 5進而搬送’於相較於檢查裝置1更位於搬送方向r之下游 側切斷處理為特定大小之矩形板狀（使寬度尺寸對齊之側 切處理以及使長度尺寸對齊之橫切處理）（切斷步驟）。進 而，於4個端面（邊緣）切削加工為特定之形狀後，進行研磨 處理’通常係於片表面實施印刷或實施表面切削加工，完 成導光板（獲取步驟）。 亦可將檢查裝置1構成為基於自檢查裝置1之輸出部43輸 I62426.doc 15 201243310 出之異常信號，將於導光板用片材6中包括判定為過度帶 黃色調或透明度降低之部分之導光板作為色調不良品而自 動進行除去處理（取出步驟）β又，於檢查裝置i中若為透 明樹脂片材則可進行上述檢查，因此不僅對導光板用片材 6，亦可對為透明樹脂片材之導光板進行上述檢查。即， 亦可將檢查裝置1構成為將導光板用片材6切斷處理為矩形 板狀後之板狀體之導光板係與導光板用片材6相同，自光 照射部2向導光板之寬度方向之一端面照射光，且藉由受 光。P3接收自導光板之另一端面出射之光。於該情形時， 亦能以不對於藉由搬送裝置5搬送之複數個導光板中相鄰 接之導光板間之空間部分進行測定之方式，根據所搬送之 導光板到達至光照射部2之時序而間斷地進行測定。 檢查裝置1係構成為檢查導光板用片材6之黃色調及透明 度，但亦可構成為分別獨立地檢查導光板用片材6之黃色 調及透明度。即，檢查裝置1亦可為檢查導光板用片材6之 黃色調或透明度之至少一者之構成。 首先，對將檢查裝置1構成為檢查導光板用片材6之黃色 調之情形進行說明。 光照射部2係向藉由搬送裝置5搬送之導光板用片材6之 端面照射光。受光部3係接收穿透導光板用片材6之穿透 光，並檢測所接收之穿透光之X值。記憶部41之第1記憶部 411係預先記憶穿透導光板用片材6之穿透光之X值與”值 之相關關係α。s己憶部41之第2記憶部412不發揮作用。判 疋斗42之第1判定部421係基於預先記憶於第1記憶部411中 162426.doc 201243310 之相關關係α，判定與藉由受光部3檢測出之X值對應之γι 值是否超過特定之閾值判定部42之第2判定部422不發 揮作用。輸出部43係於判定為YI值超過特定之閾值Si之情 形時’輸出表示導光板用片材6過度帶黃色調之信號。 於如上述般構成檢查裝置1之情形時，可基於來自導光 板用片材6之穿透光之X值而自動檢查導光板用片材6自身 之黃色調之程度》藉此，可有效地檢查導光板用片材6。 繼而，對將檢查裝置1構成為檢查導.光板用片材6之透明 度之情形進行說明。 光照射部2係向藉由搬送裝置5搬送之導光板用片材6之 端面照射光。受光部3係接收穿透導光板用片材6之穿透 光，並檢測所接收之穿透光之亮度值。記憶部41之第2記 憶部412係預先記憶穿透導光板用片材6之穿透光之亮度值 與全光線穿透率之相關關係β ^記憶部41之第丨記憶部4H 不發揮作用。判定部42之第2判定部422係基於預先記憶於 第2記憶部412中之相關關係β，_定與#由受光部3檢測出 之亮度值對應之全光線穿透率是否未達特定之間值判 定部42之第！教部421不發揮作用。而且，輸出料係於 判定為全光線穿透率未達特定之閣料之情形時，輸出表 示導光板用片材6之透明度降低之信號。 於如上述般構成檢查襞置】之情形時，可基於來自 板用片材6之穿透光之亮度值而自動檢查導光板用片材㈡ 身之透明度之程度。藉此，可有效地檢查於 所使用之導光板用片材6。 九板時 162426.doc 201243310 實施例 以下’基於實施例進而詳細說明本發明，但本發明並非 僅限定於該實施例。 (實施例1) <導光板用片材> 利用螺徑為250 mm之單軸擠壓機（布萊爾（Breyer)公司 製）將甲基丙烯酸甲酯樹脂（PMMA)(SUMIPEX EXN，住友 化學股份有限公司製）作為透明樹脂進行熔融且混練並以 樹脂溫度265°C自T型模具擠出。將自τ型模具擠出之片材 體夾入至一對表面平滑之金屬製冷卻輥中進行冷卻，製作 出導光板用片材6。藉由對如此製作之導光板用片材6進行 切斷處理而製作出厚度為4 mm、短邊方向之長度為5〇 mm 且長邊方向之長度為250 mm之矩形狀板狀體。利用研磨機 (PlaBeauty PB500 ，美佳羅科技股份有限公司 (MEGAROTECHNICA CO·，LTD.)製）對所獲得之板狀體之 各端面進行研磨處理，製作出用於測定導光板用片材6之 YI值及全光線穿透率之評價用試驗片。 <導光板用片材之YI值及全光線穿透率之測定> 利用分光光度計（U-4100型分光光度計，曰立高新技術 股份有限公司（Hitachi High_Techn〇l〇gies Corporati〇n)製） 於波長為380〜780 nm之範圍内以每5 nm對評價用試驗片測 定各波長之光線穿透率。根據所獲得之測定結果使用裝置 附帶之κ變度sf算軟體求出全光線穿透率㈤，並遵照J][S Z-8722求出XYZ色空間之X值' γ值及2值，遵照jis κ· 162426.doc 201243310 7 1 05求出黃色指數（丫”值β <檢查裝置> [光照射部2] . 將led光源（LDA8D_A1/D，松下電工股份有限公司 (Panasonic Electric Works Co.，Ltd.)製）作為光照射部2配置 • 為與導光板用片材6之寬度方向之一端部之端面相對向。 [受光部3] ° 將色彩亮度計照相機（CS_100A，柯尼卡美能達股份有限 公司（Komca Minolta Holdings，Inc.)製）作為受并 .為與導光板用片材6之寬度方向之另一端部：:面3 = 向，-面觀察取景器一面將焦點及視野中心之測定圓對準 導光板用片材6之端面。該色彩亮度計照相機係接收自寬 度方向之一端部跨及另一端部地穿透導光板用片材6之穿 透光，並檢測所接收之穿透光之X值及亮度值（cd/m2)。 [穿透導光板用片材之穿透光之黃色調之x值與導光板用片 材之YI值之相關關係] 圖2係表示於實施例丨中穿透藉由搬送裝置5連續搬送之 導光板用片材6之穿透光之X值與導光板用片材6之们值的 相關關係α之圓表。於圖2中，橫軸係表示導光板用片材6 . 之¥1值’縱軸係表示穿透導光板用片材6之穿透光之X值。 於圖2中，線Α係表示穿透光之χ值與導光板用片材6之” 值之相關關係a之直線。於實施例丨中，穿透光之χ值與導 光板用片材6之ΥΙ值具有由線a所示之下述式（1)之相關關 係α。 162426.doc •19· 201243310 y= 0.008χ+0.31 05 (1) (式中，x係表示導光板用片材6之们值，丫係表示穿透光之 X值。） 而且，於實施例^中，係將導光板用片材6之¥1值之閾值 S,設定為「3.5」。若將該閾值S|代入至上述式（1)之「χ」， 則對應於閾值S,之穿透光之X值之閾值Sn為「〇 3385广 記憶部41之第i記憶部411係預先記憶由上述式（ι)所示之 相關關係α、閾值S,及閾值Sn。 [穿透導光板用片材之穿透光之亮度值與導光板用片材之 全光線穿透率之相關關係] 圖3係表示於實施例丨中穿透藉由搬送裝置5連續搬送之 導光板用片材6之穿透光之亮度值與導光板用片材6之全光 線穿透率的相關關係β之圖表。於圖3中，橫軸係表示導光 板用片材6之全光線穿透率（％)，縱軸係表示穿透導光板用 片材6之穿透光之亮度值（cd/m2)。於圖3中，線6係表示穿 透光之亮度值與導光板用片材6之全光線穿透率之相關關 係P之直線。於實施例丨中，穿透光之亮度值與導光板用片 材6之全光線穿透率具有由線B所示之下述式之相關關 係。 y = 32.025x- 2320.3 (2) (式中，X係表示導光板用片材6之全光線穿透率（0/〇)，丫係 表示穿透光之亮度值（cd/m2)。） 而且’於實施例1中，係將導光板用片材6之全光線穿透 率之閾值S2設定為「86.5%」。若將該閾值S2代入至上述式 I62426.doc -20- 201243310 ) 」則對應於閾值S2之穿透光之亮度值之閾值S2i 為「449.8625 cd/m2」。 μ P 41之第2記憶部412係預先記憶由上述式（2)所示 之相關關係Ρ、間值S2及閾值S2]。 [判定部42] 判疋邛42之第i判定部421係基於預先記憶於第】記憶部 411中之由式⑴所示之相關關係α，判定與藉由受光部3檢 測出之X值對應2ΥΙ值是否超過特定之閨值1。第2判定部 422係基於預先記憶於第2記憶部412中之由式⑺所示之相 關關係β ’判定與藉由受光部3檢測出之亮度值對應之全 線穿透率是否未達特定之閾值S2。 [輸出部43] 輸出部4 3係於第1判定部4 21判定為YI值超過特定之閾值 W情形時或者於第2判定部似判定為全光線穿透率未達 之閾值S2之情形時，輸出表示導光板用片材6為過度 ▼汽色調之不良品或者導光板用片材6為透明度降低之 良品之異常信號。 _ <結果> 根，貫施例1之檢查裝置’輸出部43係於判定為仰 過特疋之隸S,之情料或者於射為全光㈣透率未 特定之閾值S2之情形時，輪屮矣- 達 帶黃色調之不良品=導=不導光板用片材6為過度 个民00次者導先板用片材ό為透明度降低 1之異常信號。藉此，可基於來自導純用片材6之穿 之Χ值及亮度值而自動檢查導光板用片材6自身之黃色 162426.doc 201243310 調及透明度之程度’結果可有效地檢查導光板用片材6。由 於在使用該檢查方法製造導光板之情形時亦可有效地檢查導 光板用片材或導光板，因此可使導光板之製造效率化。【圖式簡單說明】 圖1係表示本發明之檢查裝置之構成之一實施形態之 圖。 圖2係表示穿透導光板用片材 片材之YI值之相關關係之圖表。 之穿透光之X值與導光板用 圖3係表示穿透導光板用片 板用片材之全光線穿透率之相 【主要元件符號說明】 材之穿透光之亮度值與 關關係之圖表。 導光 1 檢查裝置 2 光照射部 3 受光部 4 控制裝置 5 搬送裝置 6 導光板用片材 41 記憶部 42 判定部 43 輸出部 51 搬送輥 52 冷卻輥 411 第1記憶部 412 第2記憶部 162426.doc •22· 201243310 421 第1判定部 422 第2判定部 L1 長度 R 搬送方向 162426.doc -23-When the measured luminance value corresponds to the case where the total light transmittance is less than the second threshold value, the signal indicating that the transparent resin sheet is excessively taped or the transparency is lowered is determined as the determination result in the output step. The inspection method further includes a transfer step of transporting the transparent resin sheet in the direction of the irradiation direction of the light irradiated in the light irradiation step. In this case, the light may be irradiated to the end surface of the transparent resin sheet conveyed by the transport step in the preceding irradiation step. Further, the manufacturing method of the present invention comprises: a forming step of forming a transparent resin into a transparent resin sheet by a molding method of a specific 162426.doc 201243310; and an inspection step of inspecting by any one of the above inspection methods by a forming step And a step of obtaining a transparent resin sheet; and an obtaining step of obtaining a light guide plate by at least one of cutting and grinding the transparent resin sheet when it is determined that the transparent resin sheet has optical characteristics in the inspection step . In the manufacturing method of the above-described configuration, the sheet for the light guide plate used in the production of the light guide plate can be automatically inspected based on the X value or the brightness value of the light transmitted from the sheet for the light guide plate or the light guide plate or The degree of yellowness or transparency of the light guide plate itself can effectively check the sheet for a light guide plate or the light guide plate used when fabricating the light guide plate. Thus, the optical characteristics can be effectively checked, and therefore, the light guide plate can be efficiently manufactured according to the present manufacturing method. The above-described manufacturing method may further include a take-out step of taking out the transparent resin sheet as a defective product when it is determined in the inspection step that the transparent resin sheet does not have optical characteristics. Furthermore, in the above manufacturing method, the cutting step may be further characterized in that the transparent resin sheet is a sheet for a light guide plate, and in the inspection step, it is determined that the sheet for a light guide plate has optical characteristics. In the case, the light guide plate is cut into a specific rectangular shape by a sheet. According to the present invention, the sheet or the guide sheet for the light guide plate used for the production of the light guide plate is automatically inspected based on the X value or the brightness value of the light transmitted from the sheet for the light guide plate or the light guide plate. The degree of yellowness or transparency of the light plate itself can effectively check the sheet for the light guide plate or the light guide plate. Moreover, according to the present invention, since the sheet for a light guide plate or the light guide plate can be efficiently inspected, the manufacturing efficiency of the light guide plate can be made efficient. [Embodiment] Fig. 1 is a view showing an embodiment of the configuration of an inspection apparatus according to the present invention. The inspection device 1 is a device for inspecting a rectangular plate-shaped light guide plate. The inspection apparatus 1 is an optical property inspecting whether or not the sheet 6 for a light guide plate made of a transparent resin is excessively yellowish and whether transparency is lowered. The light guide plate sheet 6 is cut into a rectangular plate shape of a specific size to fabricate a light guide plate. The light guide plate is used, for example, as a backlight source for a surface light source of a liquid crystal display. The sheet 6 for a light guide plate is not particularly limited as long as it is a sheet made of a transparent resin. Examples of the transparent resin include, for example, a polystyrene resin, an acrylonitrile-butadiene-styrene resin, a low-density polyethylene resin, a high-density polyethylene resin, a linear low-density polyethylene resin, a polystyrene resin, and a polypropylene resin. , acrylonitrile-styrene resin, cellulose acetate resin, ethylene-vinyl acetate resin, propylene-acrylonitrile-styrene resin, propylene-chlorinated polyethylene resin, ethylene-vinyl alcohol resin fluorocarbon resin, bismuth methacrylate Ester resin 'methyl methacrylate · styrene resin, polyacetal resin, polyamide resin, polyethylene terephthalate resin, aromatic polycarbonate resin, polyfluorene resin, polyether sulfone resin' Methylpentene resin, polyarylate tree. Fat, polybutylene dicarboxylate resin, resin containing ethylenic-unsaturated monomer unit containing an alicyclic structure, polyphenylene sulfide resin, polyphenylene ether resin In addition to general-purpose or engineering plastics such as polyetheretherketone resin, polystyrene-based elastomer, vaporized polyethylene, ethylene-acrylic acid ethyl ester resin, thermoplastic polyurethane elastomer, and thermoplastic polyester elastomer may also be mentioned. Ionic polymer resin, styrene I62426.doc •10- 201243310 Rubber-like polymer such as olefin-butadiene block polymer, ethylene propylene rubber, polybutadiene resin 'acrylic rubber, etc. Two or more types are used in combination. In the resin, the resin constituting the sheet 6 for a light guide plate is preferably a resin selected from the group consisting of methacrylic acid vinegar resin, styrene resin, and aromatic polycarbonate resin. The resin constituting the sheet 6 for a light guide plate may be not only one type but also a two-layer board of two kinds of resins or a three-layer board of two kinds of resins. The sheet 6 for a light guide plate includes, for example, an aromatic polycarbonate resin used in the main layer of the sheet and a fluorenyl acrylate based resin laminated on the surface layer. The resin constituting the sheet 6 for a light guide plate may be one in which a second component is mixed, and for example, a small amount of a methacrylate-based resin is added to the polycarbonate resin. The sheet 6 for a light guide plate may be composed of a resin composition in which fine particles are dispersed in a transparent resin. The fine particles are not particularly limited as long as they have a refractive index different from that of the transparent resin constituting the sheet 6 for a light guide plate and can diffuse the transmitted light. Examples of the fine particles include inorganic particles such as glass beads, silica dioxide particles, oxidized particles, carbonic acid particles, sulfuric acid-lock particles, titanium oxide particles, and talc, and styrene-based resin particles and acrylic resin particles. Resin particles and the like. For example, various materials such as a wire absorbent, a heat stabilizer, an antioxidant, a weathering agent, a light stabilizer, a Dengguang brightener, and a processing stabilizer may be added to the sheet 6 for a force guiding plate. The thickness of the sheet 6 for a light guide plate is not particularly limited, and is usually 〇5 to 15 mm', preferably 0.1 to 1 mm, more preferably 5 to 5 mm. 162426.doc.it 201243310 The sheet 6 for a light guide plate having the above configuration can be produced by a known molding method such as injection molding or extrusion molding (forming step). In the present embodiment, for example, the sheet 6 for a light guide plate is produced by extrusion molding. Specifically, the base-side transparent resin which is a base material is heated and melted by an extruder, and kneaded, and the - surface is extruded from a die into a sheet shape. The sheet for the light guide plate is produced by sandwiching the sheet material extruded from the mold into three or four cooling rolls 52, and the length L1 of the width direction of the sheet 6 for the light guide plate is based on the mold. The size is 500~5000 mm, usually 1〇〇〇~3〇〇〇 claws. As the extruder, for example, a single-axis extruder and a twin-screw extruder can be cited. As the mold, for example, a T-die is used. The sheet 6 for a light guide plate cooled by the cooling roller 52 is inspected by an inspection device (inspection step). As shown in Fig. ,, the inspection apparatus of the present embodiment includes a light irradiation unit 2 (light irradiation unit), a light receiving unit 3 (light receiving unit), a control device 4, and a conveying device 5 (transport mechanism). The control device includes the memory unit 41 'determination unit 42 and output unit 43. The inspection device is an inspection method that implements the present embodiment. Specifically, the light irradiation unit 2 performs a light irradiation step. The light receiving unit 3 performs a light receiving step. The determination (4) of the control device 4 is to perform the determination step. The output unit 43 of the control device 4 performs an output step. The conveying device 5 includes a plurality of conveying rollers 51. In the conveyance device, the sheet 6 for the light guide plate cooled by the cooling roller is continuously conveyed in the conveyance direction R to the light irradiation unit 2 (the conveyance direction of the sheet 6 for conveying the light guide plate and the sheet for the light guide plate are carried in the conveyance step). The width direction of the material 6 is orthogonal to each other, and the conveyance direction (4) is orthogonal (intersecting) to the light irradiation direction of the light irradiation unit 2. The sheet 6 for the light guide plate cooled by the cooling view 52 has a temperature of 120 C or more. In the conveyance roller 51, the distance of 10 m is transmitted to the light irradiation unit 2 by the slow cooling. The light irradiation unit 2 is oriented in the width direction of the sheet 6 for the light guide plate continuously conveyed by the conveyance device 5. The end surface of one end portion (the direction orthogonal to the transport direction r) is irradiated with light (light irradiation step). For example, a light source 2 can be used in addition to a linear light source such as a cold cathode tube or a hot cathode tube. In the present embodiment, the light-irradiating portion 2 includes, for example, an LED. The light-receiving portion 3 is disposed so as to face the end surface of the other end portion in the width direction of the sheet 6 for a light guide plate. As the light receiving unit 3, the color can be used brightly The light-receiving unit 3 receives the end surface of one end portion in the width direction of the sheet 6 for light guide plate continuously conveyed by the transport device 5, and passes through the end surface of the other end portion in the width direction to penetrate the light guide plate. The light passing through the sheet 6 (light receiving step) is used. The light receiving unit 3 detects an X value (hereinafter simply referred to as "X value") and a brightness value (light receiving step) in the color space of the received transmitted light. The device 4 includes a storage unit 41 (memory mechanism), a determination unit 42 (determination mechanism), and an output unit 43 (output mechanism). The control device 4 can be realized by, for example, a personal computer (Personal Computer 'PC). The personal computer includes a CPU ( Central processing unit 'Central Processing Unit', RAM (Random Access Memory), R〇M (Read Only Memory), etc. The memory unit 41 includes the first memory unit 41 and the second The memory unit 412. The second memory unit 4 preliminarily acquires the X value in the χγ color space of the penetrating light passing through the sheet 6 for the light guide plate, and the yellow color of the sheet 6 for the light guide plate measured by the spectrophotometer. Number of (ΥΙ) values The relationship α (for example, refer to FIG. 2) and is memorized (i 162426.doc 13 201243310 acquisition step). The second storage unit 412 obtains the brightness value of the transmitted light penetrating the light guide sheet 6 in advance, and The correlation curve β (see, for example, Fig. 3) of the total light transmittance of the sheet 6 for a light guide plate measured by a spectrophotometer is memorized (second acquisition step). The X value of the transmitted light and the sheet 62 for the light guide plate ΥΙ The correlation between the value α and the luminance value of the transmitted light and the total light transmittance of the sheet 6 for the light guide plate can be based on the type of the transparent resin constituting the sheet 6 for the light guide plate and the sheet for the light guide plate. The length, thickness, and the like of the material 6 in the width direction are appropriately changed. Here, the ΥΙ value and total light transmittance of the sheet 6 for the light guide plate can be obtained by measuring the light transmittance of each wavelength every 5 nm in a range of wavelengths of 380 to 780 nm by a spectrophotometer. The measurement result was calculated. The determination unit 42 includes a first determination unit 42A and a second determination unit 422. The first determination unit 421 determines whether or not the yellow index value corresponding to the threshold detected by the light receiving unit 3 exceeds the specific threshold S based on the correlation α stored in the i-th storage unit 4 u (first determination) The threshold value s is a sign indicating whether or not the sheet 6 for the light guide plate is excessively yellowed. When the yellow index value is larger than the interval value S|, the sheet #6 for the light plate is judged to be excessively twisted. The portion 422 determines whether or not the total light transmittance corresponding to the luminance value detected by the light receiving unit 3 has not reached the specific threshold S2 based on the correlation β stored in the second storage unit 412 (second determination step). The value Μ indicates whether the transparency of the sheet 6 for the light guide plate is lowered. When the total light transmittance is lower than the threshold S 2 , the sheet 6 for the light guide plate is judged to be transparent. The output unit 43 outputs a portion of the determination result of the 丨 macro/printer 42 42, which is determined by the 162426.doc 201243310 H421 as the yellow index value exceeds a specific threshold S, and the output indicates The sheet 6 for the light plate is excessively yellowed with the difference of m, and the output portion 43 The second determination unit determines that the total light transmittance does not reach a specific threshold, and outputs an abnormality signal indicating that the light guide (4) of the sheet 6 is lowered (output step). For example, the output unit 43 is output. A mechanism for emitting an alarm sound as an exclusive-f signal and a mechanism for displaying a message such as "a sheet for detecting a light guide plate having an excessively yellowish color and having reduced transparency" as an abnormal signal may be used. The output unit 43 is configured as the inspection device configured as described above. When it is determined that the magic value exceeds the characteristic (4) S, or when it is determined that the total light transmittance is not up to the specific threshold s2t, the abnormal signal indicating that the sheet 6 for the light guide plate is excessively yellow-colored or An abnormal signal indicating that the transparency of the sheet 6 for the light guide plate is lowered. Therefore, the yellow tone and transparency of the sheet 6 for the light guide plate can be automatically checked based on the X value and the brightness value of the light transmitted from the sheet 6 for the light guide plate. In this way, the sheet 6 for the light guide plate can be effectively inspected according to the inspection package £1. The sheet 6 for the light guide plate which has been inspected by the inspection device 1 is conveyed by the conveyance device 5 in comparison with The inspection apparatus 1 is further cut into a rectangular plate shape of a specific size on the downstream side in the conveyance direction r (side cut processing for aligning the width dimensions and cross-cut processing for aligning the length dimensions) (cutting step). Further, After the end faces (edges) are machined into a specific shape, the polishing process is performed by performing printing or performing surface cutting on the surface of the sheet to complete the light guide plate (acquisition step). The inspection device 1 may also be configured as a self-checking device. The output unit 43 of the first output unit 43 receives an abnormality signal, and the light guide plate for the light guide plate sheet 6 is automatically removed by the light guide plate which is determined to be excessively yellowish or reduced in transparency. In the inspection apparatus i, if the transparent resin sheet is used as the transparent resin sheet, the above inspection can be performed. Therefore, the above-described inspection can be performed not only on the sheet 6 for a light guide plate but also on a light guide plate which is a transparent resin sheet. In other words, the inspection device 1 may be configured such that the light guide plate of the plate-shaped body in which the sheet 6 for the light guide plate is cut into a rectangular plate shape is the same as the sheet 6 for the light guide plate, and the light irradiation unit 2 guides the light guide plate. One end face in the width direction illuminates light and receives light. P3 receives light emitted from the other end surface of the light guide plate. In this case, it is also possible to reach the light irradiation unit 2 based on the conveyed light guide plate so as not to measure the space portion between the adjacent light guide plates among the plurality of light guide plates conveyed by the transfer device 5. The measurement was performed intermittently and intermittently. The inspection apparatus 1 is configured to inspect the yellow tone and transparency of the sheet 6 for a light guide plate, but may be configured to independently check the yellow tone and transparency of the sheet 6 for a light guide plate. That is, the inspection apparatus 1 may be configured to inspect at least one of the yellow tone or the transparency of the sheet 6 for a light guide plate. First, a case where the inspection apparatus 1 is configured to inspect the yellow color of the sheet 6 for a light guide plate will be described. The light irradiation unit 2 irradiates light to the end surface of the sheet 6 for a light guide plate conveyed by the conveyance device 5. The light receiving unit 3 receives the transmitted light that has passed through the sheet 6 for the light guide plate, and detects the X value of the received transmitted light. The first memory unit 411 of the memory unit 41 stores in advance the correlation between the X value of the transmitted light passing through the sheet 6 for the light guide plate and the “value”. The second memory unit 412 of the memory unit 41 does not function. The first determination unit 421 of the judgment bucket 42 determines whether or not the γι value corresponding to the X value detected by the light receiving unit 3 exceeds a specific value based on the correlation α stored in the first storage unit 411 in advance 162426.doc 201243310. The second determination unit 422 of the threshold value determination unit 42 does not function. When the output unit 43 determines that the YI value exceeds the specific threshold value Si, the output unit 43 outputs a signal indicating that the sheet 6 for the light guide plate is excessively yellow-colored. When the inspection apparatus 1 is generally configured, the degree of yellowness of the sheet 6 for the light guide plate can be automatically checked based on the X value of the light transmitted from the sheet 6 for the light guide plate, whereby the light guide plate can be effectively inspected. The sheet 6 is described. The inspection apparatus 1 is configured to inspect the transparency of the sheet 6 for the light guide plate. The light irradiation unit 2 is the end surface of the sheet 6 for the light guide plate conveyed by the conveyance device 5. Irradiation light. The light receiving unit 3 receives the sheet for penetrating the light guide plate 6 passes the light and detects the brightness value of the received transmitted light. The second memory unit 412 of the memory unit 41 pre-stores the brightness value of the transmitted light passing through the sheet 6 for the light guide plate and the total light penetration. The correlation of the rate β ^ The memory unit 4H of the memory unit 41 does not function. The second determination unit 422 of the determination unit 42 is based on the correlation relationship β stored in the second memory unit 412 in advance, and the light is received by the light. Whether or not the total light transmittance corresponding to the luminance value detected by the unit 3 does not reach the first teaching unit 421 of the specific value determining unit 42 does not function. Further, the output material is determined to be that the total light transmittance is not up to the specific value. In the case of the cabinet material, the signal indicating the decrease in the transparency of the sheet 6 for the light guide plate is output. When the inspection device is configured as described above, the brightness value of the transmitted light from the sheet 6 for the sheet can be used. The degree of transparency of the sheet for the light guide plate (2) is automatically checked, whereby the sheet 6 for the light guide plate used can be effectively inspected. The time of the nine sheets 162426.doc 201243310 EXAMPLES Hereinafter, the present invention will be described in detail based on the examples. Invention, but the invention is not limited to (Example 1) <Sheet sheet for light guide plate> Methyl methacrylate resin (PMMA) (SUMIPEX EXN) was used by a single-axis extruder (manufactured by Breyer) having a screw diameter of 250 mm. , manufactured by Sumitomo Chemical Co., Ltd.) as a transparent resin, melted and kneaded, and extruded from a T-die at a resin temperature of 265 ° C. The sheet extruded from the τ-type mold was sandwiched between a pair of smooth metal surfaces. The cooling roll was cooled to produce a sheet 6 for a light guide plate. The sheet 6 for a light guide plate thus produced was cut to have a thickness of 4 mm and a length of 5 mm in the short side. A rectangular plate-like body having a length of 250 mm in the side direction. Each of the end faces of the obtained plate-shaped body was subjected to a polishing treatment using a grinder (PlaBeauty PB500, manufactured by MEGAROTECHNICA CO., LTD.) to prepare a YI for measuring the sheet 6 for a light guide plate. Test piece for evaluation of value and total light transmittance. <Measurement of YI value and total light transmittance of sheet for light guide plate> Using spectrophotometer (U-4100 spectrophotometer, Hitachi High_Techn〇l〇gies Corporati〇n )) The light transmittance at each wavelength was measured for the evaluation test piece every 5 nm in the wavelength range of 380 to 780 nm. According to the obtained measurement results, the total light transmittance (5) is obtained by using the softness sf sf attached to the device, and the X value of the XYZ color space γ value and the 2 value are obtained in accordance with J][S Z-8722]. Jis κ· 162426.doc 201243310 7 1 05 Find the yellow index (丫" value β < inspection device > [light irradiation unit 2] . LED light source (LDA8D_A1/D, Panasonic Electric Works Co., Ltd.) Manufactured as the light-irradiating portion 2 and facing the end surface of one end portion in the width direction of the sheet 6 for light guide plate. [Light-receiving portion 3] ° Color luminance camera (CS_100A, Konica) The other end of the width direction of the sheet 6 for the light guide plate is: the surface 3 = the direction of the light guide plate, and the focus is on the side of the viewfinder. The measurement center of the field of view is aligned with the end face of the sheet 6 for the light guide plate. The color brightness meter camera receives the transmitted light that penetrates the sheet 6 for the light guide plate from one end portion in the width direction and the other end portion, and detects The X value and brightness value (cd/m2) of the transmitted transmitted light. Correlation between the x value of the yellow tone of the sheet for the sheet and the YI value of the sheet for the light guide plate] Fig. 2 shows the sheet for the light guide plate which is continuously conveyed by the conveying device 5 in the embodiment A circular table of the correlation α between the X value of the light penetration of the material 6 and the value of the sheet 6 for the light guide plate. In Fig. 2, the horizontal axis indicates the sheet 6 for the light guide plate. It is the X value of the transmitted light penetrating through the sheet 6 for a light guide plate. In Fig. 2, the line 表示 indicates a straight line of the correlation a between the value of the transmitted light and the value of the sheet 6 for the light guide plate. In the embodiment, the χ value of the transmitted light and the ΥΙ value of the sheet 6 for the light guide plate have a correlation α of the following formula (1) shown by the line a. 162426.doc •19· 201243310 y= 0.008 χ+0.31 05 (1) (where x is the value of the sheet 6 for the light guide plate, and 丫 is the X value of the transmitted light.) Further, in the embodiment, the sheet for the light guide plate is used. The threshold value S of the value of 6 is set to "3.5". If the threshold value S| is substituted into "χ" of the above formula (1), the threshold value Sn of the X value of the transmitted light corresponding to the threshold S is "〇3385 The memory of the 41th memory section 41 The portion 411 stores in advance the correlation α, the threshold S, and the threshold Sn indicated by the above formula (1). [The brightness value of the light penetrating through the sheet for the light guide plate and the total light of the sheet for the light guide plate are worn. (Relationship of the transmittance) Fig. 3 shows the luminance value of the light transmitted through the sheet 6 for the light guide plate continuously conveyed by the transport device 5 in the embodiment, and the total light penetration of the sheet 6 for the light guide plate. A graph of the correlation of the rate β. In Fig. 3, the horizontal axis represents the total light transmittance (%) of the sheet 6 for a light guide plate, and the vertical axis represents the luminance value (cd/m2) of the transmitted light penetrating through the sheet 6 for a light guide plate. In Fig. 3, line 6 is a line indicating the correlation between the brightness value of the light transmission and the total light transmittance of the sheet 6 for the light guide plate. In the embodiment, the luminance value of the transmitted light and the total light transmittance of the sheet 6 for the light guide plate have a correlation relationship with the following expression shown by the line B. y = 32.025x- 2320.3 (2) (where X is the total light transmittance (0/〇) of the sheet 6 for the light guide plate, and 丫 is the brightness value (cd/m2) of the transmitted light.) Further, in the first embodiment, the threshold S2 of the total light transmittance of the sheet 6 for a light guide plate is set to "86.5%". When the threshold value S2 is substituted into the above formula I62426.doc -20-201243310), the threshold S2i of the luminance value of the transmitted light corresponding to the threshold S2 is "449.8625 cd/m2". The second storage unit 412 of the μ P 41 preliminarily stores the correlation Ρ, the interval S2, and the threshold S2] represented by the above formula (2). [Determining Unit 42] The i-th determination unit 421 of the determination 42 determines that the X value corresponding to the light-receiving unit 3 is determined based on the correlation α indicated by the equation (1) stored in the memory unit 411 in advance. 2 Whether the value exceeds a certain threshold of 1. The second determination unit 422 determines whether or not the total line transmittance corresponding to the luminance value detected by the light receiving unit 3 is not up to a specific value based on the correlation relationship β′ indicated by the equation (7) stored in the second storage unit 412. Threshold S2. [Output unit 43] When the first determination unit 421 determines that the YI value exceeds the specific threshold value W or when the second determination unit determines that the total light transmittance has not reached the threshold value S2, the output unit 43 The output indicates that the sheet 6 for the light guide plate is a defective product of excessive ▼ vapor color or the sheet 6 for the light guide plate is an abnormal signal of a good transparency reduction. _ <Results> Root, the inspection device 'output unit 43 of the first embodiment is based on the case where it is determined that the target S is raised, or the situation is that the total light (four) transmittance is not specified by the threshold S2. At the time, the rim - the defective product with the yellow tone = guide = the sheet 6 for the non-light guide plate is the sheet for the excessive 00 times, and the sheet for the guide plate is the abnormal signal for the transparency reduction of 1. Thereby, the yellowness of the sheet 6 for the light guide plate itself can be automatically checked based on the enthalpy value and the brightness value of the sheet 6 for guiding the pure film. 162426.doc 201243310 The degree of transparency can be effectively checked. As a result, the light guide plate can be effectively inspected. Sheet 6. Since the sheet for a light guide plate or the light guide plate can be effectively inspected when the light guide plate is manufactured by using the inspection method, the manufacturing efficiency of the light guide plate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an embodiment of the configuration of an inspection apparatus according to the present invention. Fig. 2 is a graph showing the correlation of the YI value of the sheet for penetrating the light guide plate. The X value of the transmitted light and the light guide plate are shown in Fig. 3 as the phase of the total light transmittance of the sheet for the sheet for the light guide plate. [The main component symbol description] The brightness value of the light penetrated by the material Chart. Light guide 1 Inspection device 2 Light irradiation unit 3 Light receiving unit 4 Control device 5 Transport device 6 Light guide plate sheet 41 Memory unit 42 Determination unit 43 Output unit 51 Transport roller 52 Cooling roller 411 First memory unit 412 Second memory unit 162426 .doc •22·201243310 421 First determination unit 422 Second determination unit L1 Length R Transport direction 162426.doc -23-