201100747 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種檢測板玻璃等透光性板狀物之斑紋之 檢測方法，尤其係關於一種能夠不停地檢測在檢查線上搬 送之板玻璃等透光性板狀物之斑紋之檢測方法。 【先前技術】 先前’於板玻璃等透光性板狀物之成形中，有時會於成 形後之透光性板狀物中產生部分（局部）線狀之變形（以下稱 作斑紋）’從而於品質管理方面要求對該斑紋進行檢測。 關於該斑紋，例如考慮使用先前所使用之點源燈投影法 (參照專利文獻1)進行檢測。 圖8係用以說明用於實施點源燈投影法之裝置構成等的 圖。 使用點源燈投影法之斑紋之檢測方法係對來自點源燈 (光源）之投影像中因斑紋引起而出現之微小的明暗直接以 目測進行檢測之方法，例如，如圖8所示，於暗室内，自 配置於遠方之光源1 〇〇朝板玻璃等透光性板狀物1丨〇照射 光’將透過該透光性板狀物110之光投影至螢幕12〇，檢查 員130藉由肉眼觀察該投影之光之像，藉此實施檢測。 先前技術文獻 專利文獻 專利文獻1 :日本專利特開2003-04273 8號公報 【發明内容】 發明所欲解決之問題 147626.doc 201100747 然而，於使用點源燈投影法之斑紋之檢測方法中，由於 投影至螢幕120之投影圖像係因對比度低且視認性差等理 由’而存在斑紋之檢測對於檢查員而言成為繁重之作業， 且高精度地檢測斑紋極為困難等問題。 本發明係鑒於上述情況而完成者，其目的在於提供一種 能夠減輕板玻璃等透光性板狀物中所產生之斑紋之檢測負 擔’同時高精度地檢測斑紋之檢測方法。 解決問題之技術手段 為達成上述目的，本發明之第丨態樣為一種斑紋檢測方 法，其係使用斑紋檢測裝置檢測以通過檢測區之方式搬送 之透光性板狀物之斑紋者，該斑紋檢測裝置包括：螢幕， 其係描繪有條紋圖案；攝像機構，其係以光軸相對於透光 性板狀物傾斜了特定角度之姿勢而固定配置，且其焦點被 調整為於穿透㉟不存在部分線狀之變形即斑紋的上述透光 性板狀物而對上述條紋圖案進行攝像時，使該條紋圖案之 像成像於受光元件；及圖像顯示裝置，其係包含顯示面； 該斑紋檢測方法之特徵在於包括下述步驟：藉由上述攝像 機構’穿透過通過該攝像機構之視野内之上述透光性板狀 物而對包含上述條紋圖案之圖像進行拍攝；根據上述所攝 像之圖像’對表示各像素之亮度分布之曲線進行運算，上 述各像素係構成該圖像者；以及將上述所運算出之曲線顯 不於上述圖像顯示裝置之顯示面。 上 —述第1態樣中’光軸以相對於透光性板狀物傾斜了特 X姿勢而固定配置，且’焦點被調整為於當穿透過 147626.doc 201100747 不存在斑紋之透光性板狀物而斜攸〜π + • ^ 卿而對條紋圖案進行攝像時，使 該條紋圖案成像於受光元件。 因此，當於透光性板狀物中存在贱時，因斑紋而引起 焦點距離發生變化，從而該圖像中包含散焦部分。該散焦 部分係於圖像之各像素之亮度分布曲線中以明暗之差縮 小而成為中間之亮度之方式，亮度值之對比度降低（明暗 之亮度得以平均化），因此成為亮度分布之峰值之包絡線 〇 肖取小值之包絡線彼此接近，而兩包絡線之間隔收縮之狀 態。因此’當於圖像顯示裝置之顯示面顯示亮度分布曲線 日夺’該曲線中之冑焦部分(即兩包絡線之間隔收縮之部分) • 能夠容易識別。 即，根據上述第1態樣，與如先前般之、對透光性板狀 物之變形即斑紋直接以目測檢測來自點源燈之投影像之微 小的明暗之點源燈法相比，不僅視認性大幅提高，而且能 夠將檢測之視野、距離限定於對於檢查員而言適當之範圍 ◎ 内，因此可進行負擔少且穩定之檢測。 本發明之第2態樣如上述第1態樣，包括將上述所攝像之 圖像以堆疊於前一次所攝像之圖像之形式顯示於上述圖像 顯示裝置之顯示面的步驟。 上述第2態樣中，光軸以相對於透光性板狀物傾斜了特 定角度之姿勢而固定配置，且，焦點被調整為當穿透過不 存在斑紋之透光性板狀物而對條紋圖案進行攝像時，使該 ' 條紋圖案成像於受光元件。 因此，當於透光性板狀物中存在斑紋時，因斑紋而引起 147626.doc 201100747 焦點距離發生變化’從而該圖像中包含散焦部分。因此， 當將包含條紋圖案之圖像以堆疊於前—次攝像之圖像之形 式(履歷顯示形態)而顯示於圖像顯示裝置之顯示面時，該 圖像中之散焦部分(即兩包絡線之間隔收縮之部分)會繼續 顯不（因斑紋為線狀之變形’故而係作為線狀之散焦部分 而顯示）。 因此，藉由注目於以堆疊於前—次攝像之圖像之形式而 顯示之圖像中的散焦部分(線狀之散焦部分，即收縮之部 分），可極其容易地檢測斑紋。即，根據上述第2態樣，能 夠減輕檢查員之負擔且精度穩定地檢測在線上搬送之板玻 璃等透光性板狀物中所產生之斑紋。 本發明之第3態樣如上述第丨或第2態樣，更包括下述步 驟：對上述所運算出之曲線之峰值之包絡線與最小值之包 絡線之間隔的收縮量進行運算；將上述所運算出之峰值之 包絡線與最小值之包絡線之間隔的收縮量、與特定之規格 值進行比較；以及根據上述比較結果進行上述透光性板狀 物之斑紋之有無判定。 根據上述第3態樣，可進行透光性板狀物中所產生之斑 紋之自動檢測。 本發明之第4態樣如上述第1至第3態樣中任一項記載之 發明，上述透光性板狀物為平面顯示器用之板玻璃、汽車 用之板玻璃 '或樹脂板。 上述第4態樣為透光性板狀物之例示。因此，本發明之 透光性板狀物並不限定於該等。 147626.doc 201100747 本發明之第5態樣為一種斑紋檢測方法，其係使用斑紋 &測裝置檢測以通過檢測區之方式搬送之透光性板狀物之 斑紋者，該斑紋檢測裳置包括：營幕，其係描緣有條紋圖 案’攝像機構，其係以光軸相對於透光性板狀物傾斜了特 疋角度之姿勢而固定配置，且其焦點被調整為於穿透過不 存在部分線狀之變形即斑紋的上述透光性板狀物而對上述 條紋圖案進行攝像時，使該條紋圖案之像成像於受光元 0 彳’及圖像顯示裝置’其係包含顯示面；該斑紋檢測方法 之特徵在於包括下述步驟：藉由上述攝像機構，穿透過通 過該攝像機構之視野内之上述透光性板狀物而對包含上述 - 條紋圖案之圖像進行攝像；根據上述所攝像之圖像，對表 不各像素之亮度分布之曲線進行運算，上述各像素係構成 該圖像者；對上述所運算出之曲線之峰值之包絡線與最小 值之包絡線之間隔的收縮量進行運算；將上述所運算出之 峰值之包絡線與最小值之包絡線之間隔的收縮量、與特定 〇 之規格值進行比較；以及根據上述比較結果，進行上述透 光性板狀物之斑紋之有無判定。 上述第5態樣中，光軸以相對於透光性板狀物傾斜了特 定角度之姿勢而固定配置，且，焦點被調整為當穿透過不 存在斑紋之透光性板狀物而對條紋圖案進行攝像時，使該 條紋圖案成像於受光元件。 因此，當於透光性板狀物中存在斑紋時，因斑紋而引起 焦點距離發生變化，從而該圖像中包含散焦部分。該散焦 部分係於圖像之各像素之焭度分布曲線中，於錯.亂範圍内 147626.doc 201100747 得以平均化’因而成為亮度分布之峰值之包絡線與最小值 之包絡線彼此接近，而兩包絡線之間隔收縮之狀態。 上述第5態樣中’僅藉由對峰值之包絡線與最小值之包 絡線之間隔之收縮量、與特定之規格值進行比較，便可高 精度地自動檢測透光性板狀物中所產生之斑紋。 發明之效果 如以上說明般，根據本發明，可提供一種能夠減輕板玻 璃等透光性板狀物中所產生之斑紋之檢測負擔，同時高精 度地檢測斑紋之檢測方法。 【實施方式】 以下，根據隨附圖式對本發明之斑紋檢測方法之較佳實 施形態進行詳細說明。 圖1係本實施形態之斑紋檢測方法中所使用之斑紋檢測 裝置10之系統構成圖。圖2係用以說明板玻璃之普通製造 步驟之圖。圖3係螢幕16上所描繪之條紋圖案p之例。圖4 係檢查線30上之檢測區32附近之俯視圖。 [斑紋檢測裝置之概要] 如圖2所示，使用浮式法之板玻璃，一般而言係經過如 下步驟等進行製造：熔解步驟，將向主原料之矽砂中混合 玻璃屑等所得者於熔解爐中進行熔解，從而形成透明之玻 璃生坯；成形步驟，使該熔解後之玻璃生坯流入至儲存有 熔融金屬（錫）之浮浴中，並成形為板玻璃之形狀；緩冷卻 步驟，將該成形後之板玻璃緩慢冷卻，以不會產生因溫度 差而引起之應變；清洗、乾燥步驟，對該緩冷卻後之板玻 147626.doc 201100747 璃進行清洗、乾燥；以及檢查步驟（檢查線），對該清洗、 乾燥後之板玻璃之厚度等進行檢查。 本實施形態之斑紋檢測裝置i 〇係用於對利用浮式法而成 形之電漿顯不面板（PDP，plasma dispiay panei)用之板玻璃 (以下稱作玻璃帶）中所產生之部分（局部）線狀之變形（以下 稱作斑...文）進彳于檢測之裝置，如圖4所示，該斑紋檢測裝置 10係設置於使用浮式法之板玻璃之製造步驟之上游側即檢 〇 查線30上之檢測區32。檢查對象之玻璃帶22係藉由公知之 搬送機構（未圖示）於檢查線30上進行搬送，並通過檢測區 32。斑紋檢测裝置〖〇將對通過該檢測區32之玻璃帶之斑 紋進行檢測時所參照的圖像等逐次地顯示於圖像顯示裝置 20 ° [斑紋檢測裝置之構成] 如圖1所示，本實施形態之斑紋檢測裝置10包括2組斑紋 檢測光學系統，該斑紋檢測光學系統包含圖像處理裝置 Ο 12、經由特定介面連接於圖像處理裝置12之攝像機構14、 螢幕16、照明機構18、圖像顯示裝置20等。 圖像處理裝置12係包括MPU(main processing unit，主處 理單元）或CPU(central processing unit，中央處理單元）等 運异、控制機構’ RAM(random access memory，隨機存取 記憶體）或R〇M(read only memory，唯讀記憶體）等記憶機 構（均未圖示）等。圖像處理裝置12係藉由運算、控制機構 執行明入至§己憶機構之特定程式，而作為控制攝像機構1 * 等之控制機構、對表示構成後述條紋圖案圖像之各像素之 147626.doc 201100747 焭度分布的曲線G進行運算之運算機構等而發揮功能。 攝像機構14係穿透過玻璃帶22(即透過玻璃帶22)對螢幕 16進行攝像者，例如，係受光元件（未圖示）排成一列之線 感測器型CCD(charge coupled device，電荷耦合器件）（例 如’攝影速度：數kHz)。 攝像機構14係以將自水平姿勢之玻璃帶22(寬度尺寸·· 約5 m)之寬度方向中央部22a遍及寬度方向一端部22b(及另 一端部22c)之範圍（期望斑紋之檢測之範圍）收容於視野内 之方式’且以光軸AX相對於該水平姿勢之玻璃帶22傾斜 、力1 5〜30 (較好的是1 5。），且受光元件之排列方向包含於鉛 直面之姿勢，固定配置於玻璃帶22之寬度方向兩端部 22b、22c各自之下方（參照圖i、圖4)。攝像機構“係焦點 被調整為於穿透過不存在斑紋R之水平姿勢之玻璃帶22而 對螢幕1 6進行攝像時，使該螢幕丨6(條紋圖案p)之像成像 於受光元件。 螢幕16為光透過型之螢幕，對於攝像機構“之光軸Αχ 以垂直之姿勢配置（參照圖1}。因可平均地檢測出螢幕Μ中 所有方向之斑紋R，故而如圖3所示，描繪有對於攝像機構 14之受光元件之排列方向（圖3中一點鏈線所示），傾斜了約 45430。（較好的是45。）之條紋圖案ρ。條紋圖案ρ為例如占 空比45: 55〜55: 45(較好的是5(): 5〇)，約2〜4顧間距（固 定間距或可變間距），且約500條白黑條紋圖案。 螢幕1 6例如藉由作為照明機構丨8之高頻螢光燈而均一地 照明，該照明機構18係以比攝像機構14之攝影速度更高速 147626.doc 201100747 之頻率動作。 攝像機構14穿透過通過該攝像機構14之視野内之玻璃帶 22而對包含藉由照明機構18均一照明之螢幕16(條紋圖 术P)之圖像進行攝像。圖3中之一點鏈線表示攝像機構14 對於螢幕16之攝像範圍。該經攝像之圖像被取入至圖像處 理裝置12中。 [斑紋檢測方法] 〇 其次，一邊參照圖5，一邊對利用上述構成之斑紋檢測 裝置10檢測以通過檢測區32之方式搬送之玻璃帶22之斑紋 R的方法進行說明。圖5係用於說明該方法之流程圖。以下 之處理係主要藉由圖像處理裝置12(運算、控制機構）執行 讀入至記憶機構之特定程式而實現。 攝像機構14於每個攝影時序（步驟sl〇 : Yes)，穿透過通 過該攝像機構14之視野内之玻璃帶22，而對包含藉由照明 機構1 8均一照明之螢幕丨6(條紋圖案p)之圖像〗（以下稱作條 Q 紋圖案圖像I)進行攝像（步驟S12)。 其次，圖像處理裝置12對構成該經攝像之條紋圖案圖像 1(1條線）之各像素各自之亮度值進行運#，作成表示各像 素各自之壳度分布之曲線G，即，將該運算出之各像素各 自之亮度值描晝於例如縱轴為亮度值、橫轴為纟像素（各 像素之像素位置）之座標系中所得之曲線G，且如圖6所 不，顯示於圖像顯示裝置20之顯示面（步驟S14)。 • 如上述般，攝像機構14係焦點被調整為當穿透過不存在 斑紋R之玻璃帶22而對條紋圖案P進行攝像時，使該條紋圖 147626-doc 201100747 案p之像成像於*光元件。因此，當穿透過不存在斑紋r之 玻璃帶22而對包含條紋圖案p之條紋圖案圖像旧行攝像 :、’該條紋圖案圖像1不包含散焦部分％。與此相對，當 牙透過存在斑紋尺之玻璃帶22而對包含條紋圖案p之條紋圖 案圖像I進行攝像時，因斑紋尺引起焦點距離發生變化，因 此該條紋圖案圖像1包含散焦部分DP。因此，當於圖像顯 不裝置20之顯示面顯示表示各像素之亮度分布之曲線g 夺該曲，’泉G中之散焦部分Dp(即峰值之包絡線丑卩與最小值 之包絡線EB之間隔之收縮部分）會收縮至周圍之亮度值之 平均值（參照圖6) ’因而比起先前之點源燈投影法，能夠非 常容易地看出。 因此，藉由注目於表示各像素之亮度分布之曲線g中之 散焦部分Dp ’能夠極其容易地檢測玻璃帶22中所產生之斑 紋R(斑紋檢測之輔助）。即，根據本實施形態之斑紋檢測 方法，與如先別般之、對透光性板狀物之變形即斑紋直接 以目測檢測來自點源燈之投影像之微小的明暗之點源燈法 相比，不僅視認性大幅提高，而且能夠將檢測之視野距 離限定於對於檢查員而言適當之範圍内，因此可進行負擔 少且穩定之檢測。 再者’當玻璃帶22中不存在斑紋時，曲線g之峰值之包 絡線EP與最小值之包絡線EB之間隔大致成為固定（參照圖 7A)。 另一方面，當玻璃帶22中存在斑紋時，該斑紋部分成為 散焦（defocusing)之狀態，以明暗之差縮小而成為中間之亮 147626.doc 12 201100747 度之方式，亮度值之對比度降低，因此曲線G之峰值之包 絡線EP及最小值之包絡線EB之間隔收縮（參照圖7b)。 又，當玻璃帶22中存在污垢或異物時，該部分成為光被 遮斷之狀態，僅明部之強度減弱，因此曲線G之峰值之包 絡線£]?以接近最小值之包絡線EB之方式凹陷（參照圖7C)。 其次，圖像處理裝置12將步驟S12中攝像之條紋圖案圖 像I與表示各像素之亮度分布之曲線G一併顯示於圖像顯示 0 裝置20之顯示面（步驟S16)。圖6係將步驟Sl2中攝像之條 紋圖案圖像I轉換為在左右方向上延伸之丨條線之圖像（Z工〜 12) ’且於上下方向上以n條線堆疊之形式而顯示之例。圖6 中最下段之條紋圖案圖像Itn係表示tn時間前（例如1〇分鐘 前）攝像所得者，最上段之條紋圖案圖像Iu係表示u時間前 攝像所得者。 如上述般，當穿透過存在斑紋R之玻璃帶22而對包含條 紋圖案Dp之條紋圖案圖像1進行攝像時，因斑紋尺引起焦點 ❹距離發生變化，因此該條紋圖案圖像I包含散焦部分Dp。 因此，當將包含條紋圖案p之條紋圖案圖像〗以堆疊於前— 次攝像之條紋圖案圖像1之形式（履歷顯示形態）而顯示於圖 像顯不裝置20之顯示面時，該條紋圖案圖像j中之散焦部 分Dp(即兩包絡線Ep、EB之間隔之收縮部分）會繼續顯示 (因斑紋R為線狀之變形，故而係作為線狀之散焦部分％而 顯不）。該線狀之散焦部分Dp收縮至周圍之亮度值之平均 值因而比起先蝻之點源燈投影法，能夠非常容易地看出 (參照圖6 )。 147626.doc •13· 201100747 因此，藉由注目於條紋圖案圖像j中之散焦部分叫線狀 之散焦部分DP，即收縮之部分），能夠極其容易檢測玻璃 帶22中所產生之斑紋反（斑紋檢測之辅助）。即，根據本實 施形態之斑紋檢測方法，能夠減輕檢查員之負擔且精度穩 定地檢測在線上搬送之板玻璃等透光性板狀物中所產生: 斑紋。 其次，對用以進行斑紋R之自動檢測之處理進行說明（步 驟S18〜S22)。再者，於不進行斑紋反之自動檢測時可省 略該等步驟S18〜S22。 ❹ 圖像處理裝置12對步驟S14中運算出之曲線〇之峰值之 包絡線EP與最小值之包絡線EB之間隔之收縮量進行運算 (步驟s…，且對該運算出之兩包絡線Ep、EB之收縮量與 預先規疋之特定之規格值（設定範圍）進行比較，根據該比 較結果，進行兩包絡、_P、EB之收縮量是否為規格值（設 -範圍)内，即，玻璃帶22之斑紋R之有無判定(步驟 S2〇)。繼而，對於圖像處理裝置12而言，若該運算出之包 絡線EP、EB之收縮量在規格值（設定範圍）内（步驟㈣： Y叫，則回到步驟S10中，並重複進行步驟si〇〜請之處 理。即，對於在檢查線30上搬送之玻璃㈣，不停地自動 測 斑紋 R。另-Ht* _EL 41： I Ι«Ί /a ι- 方面對於圖像處理裳置12而言，若該 =异出之兩包絡、_Ρ、ΕΒ之收縮量不在規格值（設定範圍） 内（^驟820.]^〇)，則葬由將·盤止楚相 則猎由將3告等顯示於圖像顯示裝置 2υ之顯不面而通知該内容。 如上述般，根據本實施形態，藉由進行步驟S18〜S20之 147626.doc -14· 201100747 處理（即，僅藉由對峰值之包絡線EP與最小值之包絡線eb 之間隔之收縮量、與特定之規格值進行比較），而可高精 度地自動檢測玻璃帶22中所產生之斑紋R。 其次，對變形例進行說明。 上述實施形態中’對檢查對象之板玻璃（即玻璃帶22)為 電漿顯示面板（PDP)用之板玻璃之例進行了說明，但本發 明並不限定於此。例如，可將平面顯示器用之板玻璃（例 ❹ 如，液晶顯示器（LCD，liquid crystal display)用之板玻 璃、場發射顯示器用之板玻璃、有機EL(Electr〇luminescence ，電致發光）用之板玻璃等平面顯示器面板（FpD，flat panel display)用之板玻璃）、汽車用之板玻璃、或樹脂板 作為檢查對象。 又，上述實施形態中，對檢查對象為未被切斷之板玻璃 (即玻璃帶22)之例進行了說明，但本發明並不限定於此。 例如，可將於切斷步驟中切斷板玻璃後之玻璃板作為檢查 ❹ 對象。 又，上述實施形態中，對斑紋檢測裝置丨〇包括2組斑紋 檢測光學系統之例進行了說明，但本發明並不限定於此。 例如，只要可將自玻璃帶22之寬度方向一端部⑽遍及另 -端部22e之範圍收容於視野内，則亦可僅使社组斑紋檢 測光學系統。又，為提高檢測精度亦可使用3組以上之斑 紋檢測光學系統。 ' 又，上述實施形態中，對攝傻媸播彳』*成aBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a streak of a light-transmissive plate such as a plate glass, and more particularly to a plate glass capable of continuously detecting a conveyance on an inspection line. A method for detecting speckles of a light-transmissive plate. [Prior Art] In the formation of a light-transmissive plate such as a plate glass, a partial (partial) linear deformation (hereinafter referred to as a "strip") may occur in the light-transmissive plate after molding. Therefore, the marking is detected in terms of quality management. Regarding this speckle, for example, it is considered to perform detection using the point source lamp projection method (refer to Patent Document 1) used previously. Fig. 8 is a view for explaining the configuration of a device for performing a point source lamp projection method and the like. The method for detecting streaks using the point source lamp projection method is a method of directly detecting visually small shadows caused by speckles in a projection image from a point source lamp (light source), for example, as shown in FIG. In the dark room, the light source 1 is disposed in the far side, and the light-transmissive plate member such as the plate glass is irradiated with light. The light transmitted through the light-transmissive plate 110 is projected onto the screen 12〇, and the inspector 130 borrows The image of the projected light is observed by the naked eye, thereby performing detection. PRIOR ART DOCUMENT PATENT DOCUMENT Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-04273 No. PCT Publication No. 2003-04273 No. The projection image projected onto the screen 120 is caused by the fact that the contrast is low and the visibility is poor, and the detection of the streaks becomes a burdensome work for the inspector, and it is extremely difficult to detect the streaks with high precision. The present invention has been made in view of the above circumstances, and an object of the invention is to provide a method for detecting a speckle with high precision while reducing the detection load of streaks generated in a translucent plate member such as a plate glass. Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is a speckle detecting method which detects a streak of a translucent plate which is conveyed by a detecting zone by using a speckle detecting device. The detecting device includes: a screen which is depicted with a stripe pattern; and an imaging mechanism fixedly disposed with a posture in which the optical axis is inclined at a specific angle with respect to the light-transmitting plate, and the focus thereof is adjusted to penetrate 35 The image of the stripe pattern is formed on the light receiving element when the stripe pattern is imaged, and the image of the stripe pattern is formed on the light receiving element; and the image display device includes a display surface; The detecting method is characterized by comprising the steps of: capturing an image including the stripe pattern by the imaging mechanism 'permeating through the translucent plate in the field of view of the imaging mechanism; and capturing the image according to the above The image 'calculates a curve indicating the luminance distribution of each pixel, and each of the above pixels constitutes the image; and the above is calculated The curve is not displayed on the display surface of the above image display device. In the first aspect, the 'optical axis' is fixedly arranged in a special X posture with respect to the translucent plate, and the 'focus is adjusted so as to penetrate the light of 147626.doc 201100747 without speckle. The stripe pattern is imaged on the light receiving element when the stripe pattern is imaged by squinting ~π + • ^. Therefore, when flaws are present in the light-transmitting sheet, the focal length changes due to the streaks, so that the image contains the defocused portion. The defocusing portion is formed by narrowing the difference between light and dark in the luminance distribution curve of each pixel of the image to become the intermediate luminance, and the contrast of the luminance value is lowered (the brightness of the light and dark is averaged), and thus the peak of the luminance distribution is obtained. The envelope of the envelope is close to each other, and the interval between the two envelopes is contracted. Therefore, when the display surface of the image display device displays the brightness distribution curve, the focus portion of the curve (i.e., the portion where the two envelopes are contracted) can be easily identified. In other words, according to the first aspect described above, compared with the point source lamp method in which the deformation of the translucent plate member, that is, the speckle is directly visually detected from the spot light of the point source lamp, it is not only visually recognized. The performance is greatly improved, and the field of view and distance to be detected can be limited to a range within an appropriate range for the inspector, so that it is possible to perform detection with little burden and stability. According to a second aspect of the present invention, in the first aspect, the image to be imaged is displayed on the display surface of the image display device in an image stacked on the image captured by the previous time. In the second aspect, the optical axis is fixedly disposed at a predetermined angle with respect to the light-transmitting plate, and the focus is adjusted so as to penetrate the light-transmissive plate without the streaks and the stripes. When the pattern is imaged, the 'stripe pattern is imaged on the light receiving element. Therefore, when there is streaking in the light-transmissive plate, the focal length changes due to the streaks 147626.doc 201100747, and thus the image contains the defocused portion. Therefore, when the image including the stripe pattern is displayed on the display surface of the image display device in the form of an image stacked in the front-to-bottom image (history display form), the defocused portion in the image (ie, two The portion of the envelope that is contracted by the space) will continue to be displayed (because the speckle is linearly deformed) and thus displayed as a linear defocused portion). Therefore, by focusing on the defocused portion (the defocused portion of the line, i.e., the contracted portion) in the image displayed in the form of the image stacked in the front-to-bottom image, the streaks can be detected extremely easily. In other words, according to the second aspect described above, it is possible to reduce the burden on the inspector and accurately detect the streaks generated in the translucent plate member such as the plate glass conveyed on the line. According to a third aspect of the present invention, in the second aspect or the second aspect, the method further includes: calculating a contraction amount of an interval between an envelope of a peak of the calculated curve and a minimum value; The amount of contraction between the envelope of the peak calculated above and the envelope of the minimum value is compared with a specific specification value, and the presence or absence of the speckle of the translucent plate-like object is determined based on the comparison result. According to the third aspect described above, the automatic detection of the streaks generated in the translucent plate member can be performed. According to a fourth aspect of the invention, the light transmissive plate member is a plate glass for a flat panel display, a sheet glass for an automobile, or a resin sheet. The fourth aspect described above is an example of a light-transmitting plate. Therefore, the light-transmitting plate member of the present invention is not limited to these. 147626.doc 201100747 A fifth aspect of the present invention is a speckle detection method for detecting a speckle of a translucent plate which is conveyed by means of a detection zone by using a speckle & : The battalion is a stripe pattern 'camera mechanism, which is fixedly arranged with the optical axis tilted at a special angle with respect to the translucent plate, and its focus is adjusted so that the penetration does not exist. When the linear stripe is deformed, that is, the stripe-shaped light-transmissive plate, and the stripe pattern is imaged, the image of the stripe pattern is imaged on the light-receiving element 彳' and the image display device includes a display surface; The speckle detecting method is characterized in that the image capturing means passes through the translucent plate in the field of view of the image capturing mechanism to image an image including the stripe pattern; The image of the image is calculated by plotting the curve of the brightness distribution of each pixel, and each of the pixels constitutes the image; the envelope of the peak of the calculated curve is Calculating the amount of contraction of the interval between the envelopes of the minimum value; comparing the contraction amount of the interval between the envelope of the peak calculated above and the envelope of the minimum value, and the specification value of the specific chirp; and based on the above comparison result, The determination of the presence or absence of the streaks of the above-mentioned light-transmitting plate member was carried out. In the fifth aspect, the optical axis is fixedly disposed at a certain angle with respect to the light-transmitting plate, and the focus is adjusted so as to penetrate the light-transmissive plate without the streaks and the stripes. When the pattern is imaged, the stripe pattern is imaged on the light receiving element. Therefore, when there is a streak in the light-transmitting plate, the focal length changes due to the streaks, so that the image contains the defocused portion. The defocusing portion is in the temperature distribution curve of each pixel of the image, and is averaged in the wrong range of 147626.doc 201100747. Thus, the envelope of the peak and the minimum value of the peak of the luminance distribution are close to each other. The state in which the two envelopes are contracted. In the fifth aspect, 'the amount of contraction between the envelope of the peak and the envelope of the minimum value is compared with a specific specification value, and the light-transmissive plate can be automatically detected with high precision. Produce the markings. Advantageous Effects of Invention As described above, according to the present invention, it is possible to provide a method for detecting a speckle with high precision while reducing the detection load of streaks generated in a translucent plate member such as a glass plate. [Embodiment] Hereinafter, preferred embodiments of the speckle detecting method of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a system configuration diagram of a speckle detecting device 10 used in the speckle detecting method of the embodiment. Fig. 2 is a view for explaining the ordinary manufacturing steps of the sheet glass. FIG. 3 is an example of a stripe pattern p depicted on the screen 16. 4 is a top plan view of the vicinity of the detection zone 32 on the inspection line 30. [Outline of the zebra detecting device] As shown in Fig. 2, the plate glass using the floating method is generally manufactured by the following steps: a melting step of mixing glass swarf into the slag of the main raw material, etc. Melting in the melting furnace to form a transparent glass green body; forming step of flowing the molten glass green body into a floating bath in which molten metal (tin) is stored, and forming into a shape of a plate glass; slow cooling step , the formed plate glass is slowly cooled so as not to cause strain caused by the temperature difference; the cleaning and drying steps, the slowly cooled plate glass 147626.doc 201100747 glass is washed and dried; and the inspection step ( Check the line), check the thickness of the cleaned and dried plate glass, and so on. The speckle detecting device i of the present embodiment is a portion (partially referred to as a glass ribbon) used for a plasma display panel (PDP) formed by a floating method (partially referred to as a glass ribbon). The linear deformation (hereinafter referred to as "spot") enters the detecting device, and as shown in FIG. 4, the marking detecting device 10 is disposed on the upstream side of the manufacturing step of the plate glass using the floating method. The inspection area 32 on line 30 is checked. The glass ribbon 22 to be inspected is transported on the inspection line 30 by a known transport mechanism (not shown) and passes through the detection zone 32. The zebra detecting device 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐 逐The speckle detecting device 10 of the present embodiment includes two sets of speckle detecting optical systems including an image processing device 12, an imaging mechanism 14 connected to the image processing device 12 via a specific interface, a screen 16, and an illumination mechanism 18. , image display device 20, and the like. The image processing device 12 includes an MPU (main processing unit) or a CPU (central processing unit), and the like, and a control unit 'RAM (random access memory) or R〇 Memory mechanisms (none of which are not shown) such as M (read only memory). The image processing device 12 is a control unit that controls the imaging unit 1* and the like by the arithmetic and control unit, and is a control unit that controls the image pickup unit 1* and the like, and 147626 which indicates each pixel constituting a stripe pattern image to be described later. Doc 201100747 The curve G of the twist distribution functions as a calculation mechanism for calculation. The imaging mechanism 14 passes through the glass ribbon 22 (that is, through the glass ribbon 22) to image the screen 16, for example, a line-sensing type CCD (charge coupled device) in which light receiving elements (not shown) are arranged in a line. Device) (eg 'photography speed: several kHz). The image pickup mechanism 14 is a range in which the center portion 22a in the width direction of the glass ribbon 22 (width dimension·about 5 m) in the horizontal posture is spread over the one end portion 22b (and the other end portion 22c) in the width direction (the range of detection of the desired speckle) The mode of being accommodated in the field of view is inclined by the optical axis AX with respect to the glass ribbon 22 of the horizontal posture, and the force is 15 to 30 (preferably 15), and the direction in which the light receiving elements are arranged is included in the vertical plane. The posture is fixedly disposed below each of the end portions 22b and 22c in the width direction of the glass ribbon 22 (see FIGS. 1 and 4). The imaging unit "is adjusted so that the image of the screen 丨 6 (striped pattern p) is imaged on the light receiving element when the glass frame 22 that has passed through the horizontal posture in which the smear R is not present is imaged. For the light transmission type screen, the optical axis of the imaging mechanism is arranged in a vertical position (refer to Fig. 1). Since the speckle R in all directions in the screen is detected evenly, as shown in Fig. 3, The arrangement direction of the light-receiving elements of the image pickup unit 14 (shown by the one-dot chain line in Fig. 3) is inclined by about 45,430. (preferably 45.) the stripe pattern ρ. The stripe pattern ρ is, for example, a duty ratio of 45:55. ~55: 45 (preferably 5 (): 5 〇), about 2 to 4 spacing (fixed pitch or variable pitch), and about 500 white and black stripe patterns. Screen 16 is used, for example, as a lighting mechanism The illuminating mechanism 18 is operated at a higher speed than the imaging speed of the imaging unit 14 at a speed of 147626.doc 201100747. The imaging mechanism 14 penetrates through the field of view passing through the imaging mechanism 14. The glass ribbon 22 is included by the illumination mechanism 18 An image of an illumination screen 16 (striped picture P) is imaged. One of the dotted lines in FIG. 3 indicates the imaging range of the imaging mechanism 14 for the screen 16. The captured image is taken to the image processing device 12. [Stripe Detection Method] Next, a method of detecting the streaks R of the glass ribbon 22 conveyed by the detection region 32 by the speckle detection device 10 having the above configuration will be described with reference to Fig. 5. Fig. 5 is used. The flow chart of the method is mainly described by the image processing device 12 (computing and control mechanism) executing a specific program read into the memory mechanism. The camera mechanism 14 is at each shooting sequence (step sl1〇 : Yes), through the glass ribbon 22 passing through the field of view of the camera mechanism 14, and the image containing the screen 丨6 (striped pattern p) uniformly illuminated by the illumination mechanism 18 (hereinafter referred to as strip Q pattern) The pattern image I) is imaged (step S12). Next, the image processing device 12 performs a color value for each of the pixels constituting the imaged stripe pattern image 1 (one line), and creates each pixel. Individual The curve G of the degree distribution, that is, the luminance value of each of the calculated pixels is traced to a curve G obtained by, for example, a coordinate system in which the vertical axis is the luminance value and the horizontal axis is the 纟 pixel (the pixel position of each pixel). Further, as shown in FIG. 6, it is displayed on the display surface of the image display device 20 (step S14). • As described above, the image pickup mechanism 14 is adjusted in focus to pass through the glass ribbon 22 in which the speckle R is not present, and the stripe pattern is applied. When P is imaged, the image of the fringe pattern 147626-doc 201100747 is imaged on the *optical element. Therefore, when the glass ribbon 22 without the speckle r is penetrated, the stripe pattern image including the stripe pattern p is imaged. :, 'The stripe pattern image 1 does not include the defocused portion %. On the other hand, when the tooth is transmitted through the glass ribbon 22 having the stencil, the stripe pattern image I including the stripe pattern p is imaged, and the focal length is changed by the striated ruler. Therefore, the stripe pattern image 1 includes the defocused portion. DP. Therefore, when the curve g indicating the luminance distribution of each pixel is displayed on the display surface of the image display device 20, the defocus portion Dp in the spring G (ie, the envelope of the peak ugly and minimum values of the peak) The contraction of the interval between the EBs will shrink to the average of the surrounding brightness values (see Figure 6) 'and thus can be seen very easily compared to the previous point source projection method. Therefore, the speckle R (assisted by the speckle detection) generated in the glass ribbon 22 can be extremely easily detected by focusing on the defocus portion Dp' in the curve g indicating the luminance distribution of each pixel. That is, according to the speckle detection method of the present embodiment, compared with the point source lamp method in which the deformation of the translucent plate member, that is, the speckle is directly visually detected from the spot light of the point source lamp, In addition, the visibility is greatly improved, and the field of view distance to be detected can be limited to an appropriate range for the inspector, so that a less burdenful and stable detection can be performed. Further, when there is no streaking in the glass ribbon 22, the interval between the envelope EP of the peak of the curve g and the envelope EB of the minimum value is substantially constant (see Fig. 7A). On the other hand, when there is a streak in the glass ribbon 22, the speckle portion becomes a defocusing state, and the contrast between the brightness and the darkness is reduced to become the middle bright light 147626.doc 12 201100747 degrees, the contrast of the luminance value is lowered, Therefore, the interval between the envelope EP of the peak of the curve G and the envelope EB of the minimum value is contracted (refer to Fig. 7b). Further, when there is dirt or foreign matter in the glass ribbon 22, the portion is in a state in which the light is blocked, and only the intensity of the bright portion is weakened, so the envelope of the peak of the curve G is taken as an envelope EB close to the minimum value. The recess is (see Fig. 7C). Next, the image processing device 12 displays the stripe pattern image I imaged in step S12 together with the curve G indicating the luminance distribution of each pixel on the display surface of the image display 0 device 20 (step S16). 6 is an image in which the stripe pattern image I imaged in step S12 is converted into an image of a line extending in the left-right direction (Z-work to 12)' and is displayed in the form of a stack of n lines in the up-and-down direction. example. The stripe pattern image Itn in the lowermost stage in Fig. 6 indicates that the image is obtained before the tn time (for example, 1 minute ago), and the stripe pattern image Iu in the uppermost stage indicates the image obtained before the u time. As described above, when the stripe pattern image 1 including the stripe pattern Dp is imaged through the glass ribbon 22 having the speckle R, the focus pupil distance is changed by the speckle ruler, and thus the stripe pattern image I includes defocus Part of the Dp. Therefore, when the stripe pattern image including the stripe pattern p is displayed on the display surface of the image display device 20 in the form of a stripe pattern image 1 (history display mode) stacked in the previous image, the stripe The defocused portion Dp in the pattern image j (that is, the contracted portion of the interval between the two envelopes Ep and EB) continues to be displayed (because the speckle R is linearly deformed, it is displayed as a linear defocus portion%). ). The linear defocusing portion Dp is contracted to the average value of the surrounding luminance values and thus can be seen very easily compared to the prior point source lamp projection method (refer to Fig. 6). 147626.doc •13· 201100747 Therefore, by focusing on the defocused portion in the stripe pattern image j called the linear defocus portion DP, that is, the contracted portion, it is extremely easy to detect the streaks generated in the glass ribbon 22. Anti (assisted by speckle detection). In other words, according to the speckle detection method of the present embodiment, it is possible to reduce the burden on the inspector and accurately detect the occurrence of streaks in the translucent plate member such as the plate glass that is transported on the line. Next, the processing for performing the automatic detection of the streaks R will be described (steps S18 to S22). Further, the steps S18 to S22 may be omitted when the speckle is not automatically detected.图像 The image processing device 12 calculates the contraction amount of the interval between the envelope EP of the peak value of the curve 运算 calculated in step S14 and the envelope EB of the minimum value (step s..., and the two envelopes Ep for the calculation) The EB shrinkage amount is compared with a predetermined specification value (setting range), and based on the comparison result, whether the shrinkage amount of the two envelopes, _P, and EB is within the specification value (set-range), that is, the glass The determination of the presence or absence of the streaks R of the belt 22 (step S2 〇). Then, the image processing apparatus 12, if the calculated contraction amounts of the envelopes EP and EB are within the specification value (setting range) (step (4): When Y is called, the process returns to step S10, and the process of step si〇~ is repeated. That is, for the glass (4) conveyed on the inspection line 30, the speckle R is automatically detected. Another-Ht* _EL 41: I Ι«Ί /a ι- For the image processing skirt 12, if the shrinkage of the two envelopes, _Ρ, ΕΒ is not within the specification value (setting range) (^ 820.] ^ 〇) , the burial is performed by the singer, and the singer is displayed on the image display device 2 The content is notified without being noticed. As described above, according to the present embodiment, the processing is performed by steps 147626.doc -14·201100747 of steps S18 to S20 (i.e., only by the envelope of the envelope EP and the minimum value of the peak value). The amount of contraction of the interval of the line eb is compared with a specific specification value, and the speckle R generated in the glass ribbon 22 can be automatically detected with high precision. Next, a modification will be described. The plate glass (i.e., the glass ribbon 22) is an example of a plate glass for a plasma display panel (PDP), but the present invention is not limited thereto. For example, a plate glass for a flat display can be used (for example, for example, For flat panel display (FpD, flat panel display) for liquid crystal display (LCD), plate glass for field emission display, and plate glass for organic EL (Electr〇luminescence) In the case of the above-described embodiment, the inspection glass is an uncut glass (ie, the glass ribbon 22). In addition, the present invention is not limited to this. For example, the glass plate after cutting the sheet glass in the cutting step can be used as a target for inspection. Further, in the above embodiment, the marking detection device includes two groups. Although the example of the speckle detection optical system has been described, the present invention is not limited thereto. For example, as long as one end portion (10) in the width direction of the glass ribbon 22 can be accommodated in the field of view over the other end portion 22e, Only the group detection optical system can be used. In addition, three or more sets of speckle detection optical systems can be used to improve the detection accuracy. 'In addition, in the above embodiment, the filming of the fool is 彳* into a
T僻像機構丨4為線感測器型CCD 之例進行了說明’但本發明並不限定於此。例如，亦可使 147626.doc -15- 201100747 用區域感測器型之攝像裝置作為攝像機構14。 又，上述實施形態中，對一邊顯示表示各像素之亮度分 布之曲線G及條紋圖案圖像〖，一邊自動測定斑紋R之例（圖 5中，參照步驟S 10〜步驟S22)進行了說明，但本發明並不 限定於此。例如，亦可無需顯示表示各像素之亮度分布之 曲線〇及條紋圖案圖像I，而自動測定斑紋R。 又’上述實施形態中’對將表示各像素之亮度分布之曲 線G及條、，，文圖案圖像随示於同—晝面（圖像顯示裝置之 顯示面）之例進行了說明，但本發明並不限定於此。例 如’亦可僅顯示表示各像素之亮度分布之曲線G，或僅顯 示條紋圖案圖像I。 又，上述實施形態中，對攝像機構14固定配置於玻璃帶 22之寬度乂方向兩端部咖、22。各自之下方（參照圖！、圖句 气進行了 α兒明，但本發明並不限定於此。例如，攝像 機構14亦可固^配置於玻璃帶以之寬度方向㈣部咖、 22C各自之上方，還可配置於其他處。 丄述實施形態所有方面僅為例示而已。本發明並編 ::::::限定性解釋者。本發明可在不脫離其精利 次主要特欲之鸵圍内以其他各種形式而實施。 多…詳細且特定之實施態樣對本中請案進行了說明， = 只要不脫離本發明之精神及範圍則可添加 戈修正。本申請案係基於2009年4月9曰申f主之日 ::二申請案(曰本專利特願2__。94937)，其内容二昭 万式併入本文令。 ^，，，、 J47626.doc 16 201100747 【圖式簡單說明】 圖1係本實施形態之斑紋檢測方法中所使用之斑紋檢測 裝置10之系統構成圖。 圖2係用以說明板玻璃之普通製造步驟之圖。 圖3係螢幕16上所描繪之條紋圖案P之例。 圖4係檢查線30上之檢測區32附近之俯視圖。 圖5係用以說明檢測玻璃帶22之斑紋之方法的流程圖。 圖6係表示各像素之亮度分布之曲線g及條紋圖案圖像j 之例。 圖7 A係玻璃帶22中不存在斑紋時之曲線G。 圖7B係玻璃帶22中存在斑紋時之曲線G。 圖7C係玻璃帶22中存在污垢或異物時之曲線G。 圖8係用於說明點源燈投影法之圖。 【主要元件符號說明】 10 斑紋檢測裝置 12 圖像處理裝置 14 攝像機構 16 螢幕 18 照明機構 20 圖像顯示裝置 22 玻璃帶 22a 中央部 22b 、 22c 端部 ΑΧ 光軸 147626.doc -17·The image sensor type 丨4 is an example of a line sensor type CCD. However, the present invention is not limited thereto. For example, the 147626.doc -15-201100747 can also be used as the imaging mechanism 14 with the area sensor type image pickup device. Further, in the above-described embodiment, an example in which the speckle R is automatically measured while displaying the curve G indicating the luminance distribution of each pixel and the stripe pattern image (see FIG. 5 with reference to steps S10 to S22) has been described. However, the invention is not limited thereto. For example, it is also possible to automatically determine the speckle R without displaying the curve 表示 and the stripe pattern image I indicating the luminance distribution of each pixel. In the above-described embodiment, the example in which the curve G and the bar indicating the luminance distribution of each pixel are displayed on the same surface (the display surface of the image display device) is described. The present invention is not limited to this. For example, only the curve G indicating the luminance distribution of each pixel or only the stripe pattern image I may be displayed. Further, in the above embodiment, the image pickup mechanism 14 is fixedly disposed at both end portions of the glass ribbon 22 in the width 乂 direction. The lower part of each of them is described below with reference to the drawings and the drawings. However, the present invention is not limited thereto. For example, the imaging unit 14 may be disposed in the width direction of the glass ribbon (four), and each of the 22C. The above description may be arranged elsewhere. All aspects of the detailed description are merely illustrative. The present invention is incorporated in the following::::::Definitive interpreter. The present invention can be used without departing from its main advantages. It is implemented in various other forms. More... Detailed and specific implementations are described in this application. = The correction can be added as long as it does not deviate from the spirit and scope of the present invention. This application is based on 2009 4 On the 9th day of the 9th day of the application of the main day: the second application (the special patent of this patent 2__.94937), the content of which is incorporated in this article. ^,,,, J47626.doc 16 201100747 [Simplified illustration Fig. 1 is a system configuration diagram of a speckle detecting device 10 used in the speckle detecting method of the present embodiment. Fig. 2 is a view for explaining a general manufacturing procedure of the plate glass. Fig. 3 is a stripe pattern depicted on the screen 16. Example of P. Figure 4 is the inspection on inspection line 30. Fig. 5 is a flow chart for explaining a method of detecting the streaks of the glass ribbon 22. Fig. 6 is a view showing an example of a curve g of the luminance distribution of each pixel and a stripe pattern image j. The curve G when there is no streaking in the belt 22. Fig. 7B is a curve G when there is a streak in the glass ribbon 22. Fig. 7C is a curve G when there is dirt or foreign matter in the glass ribbon 22. Fig. 8 is a diagram for explaining a point source lamp Fig. [Description of main components] 10 Speckle detection device 12 Image processing device 14 Imaging mechanism 16 Screen 18 Illumination mechanism 20 Image display device 22 Glass ribbon 22a Central portion 22b, 22c End ΑΧ Optical axis 147626.doc -17·