200303994 l f 玖、發明說明 (發明說明應敘明：發明所屬之技術領域、先前技術、內容、實施方式及圖式簡單說明） 【發明所屬之技術領域】 本發明係有關於一種光纖光學平板及光纖光學平板所適 用之凹凸圖型檢測裝置。 【先前技術】 近年來，係要求有卡片型凹凸圖型（指紋）檢測裝置之實現 等認證裝置之小型化與薄型化。爲了實現該凹凸圖型檢測裝 置，爲利用被測定對象（手指）內部之散亂光而檢測被測定對 0 象表面之凹凸圖型的方法較爲適當。 利用被測定對象內部之散亂光之習知的凹凸圖型檢測裝 置係例如於日本專利第3 04 5 62 9號公報所揭示，係爲一種照 明光由側方射入被測定對象之內部，而在被測定對象之內部 散之光爲被射入至配置在被測定對象之下方的凹凸圖型傳 送裝置。此外，如以日本專利特開2000-2 1 78 03號公報所揭 示，被配置在受光元件之側方的照明裝置，係爲一種照明被 置放於受光元件之受光面的被測定對象之物。 · 【發明內容】 不過，在日本專利第3045629號公報之凹凸圖型檢測裝置 中，與凹凸圖型傳送裝置分離之照明裝置係被設置在被測定 對象之側方、亦即被設置在檢測面之斜上方，因此，具有裝 置之小型化或薄型化仍具有一定的限制之問題。此外，在曰 本專利特開2000-2 1 7803號公報之凹凸圖型檢測裝置中’則 具有照明裝置無法效率爲佳的照明被測定對象之問題。200303994 lf 发明, description of the invention (the description of the invention should state: the technical field, the prior art, the content, the embodiments, and the drawings of the invention briefly) [Technical field to which the invention belongs] The present invention relates to a fiber optic flat plate and optical fiber Concave-convex pattern detection device for optical flat plate. [Prior Art] In recent years, miniaturization and thinning of authentication devices such as the realization of card-type bump pattern (fingerprint) detection devices have been required. In order to realize this concave-convex pattern detection device, a method for detecting the concave-convex pattern on the surface of the object to be measured using scattered light inside the object to be measured (finger) is appropriate. A conventional concave-convex pattern detection device using scattered light inside a measured object is disclosed in, for example, Japanese Patent No. 3 04 5 62 9 and is a kind of illumination light incident from the side into the measured object. The light scattered inside the object to be measured is incident on a concave-convex pattern conveying device arranged below the object to be measured. In addition, as disclosed in Japanese Patent Laid-Open No. 2000-2 1 78 03, an illumination device disposed on the side of a light receiving element is a type of object that illuminates a measurement object placed on a light receiving surface of the light receiving element. . · [Summary] However, in the bump pattern detection device of Japanese Patent No. 3045629, an illumination device separate from the bump pattern transfer device is provided on the side of the object to be measured, that is, on the detection surface. It is obliquely upward, and therefore there is a problem that there is a certain limitation in miniaturization or thinning of the device. In addition, the uneven pattern detection device of Japanese Patent Laid-Open No. 2000-2 1 7803 has a problem that the illumination device cannot illuminate the object to be measured with high efficiency.
200303994 A 本發明係爲用以解決上述問題所提出之物，其目的係爲提 供一種光纖光學平板及光纖光學平板所適用之凹凸圖型檢 測裝置，在利用被測定對象內部之散亂光之凹凸圖型檢測裝 置中，可使裝置小型化或薄型化、以及照明裝置可效率爲佳 的照明被測定對象。 爲了達成上述目的，本發明之光纖光學平板係爲，其特徵 在於：被適用於檢測被測定對象之凹凸圖型的凹凸圖型檢測 裝置，各個軸線爲與雙方之端面斜交，聚合多數光纖以將包 覆中之多數核心呈現以所定之間隔來配置狀，在已成形以呈 型之光纖光學平板中，係以包含有面對拍攝凹凸圖型之拍攝 裝置的檢測區域、以及連接於檢測區域的同時面對照明被測 定對象之照明裝置的照明區域所構成，在檢測區域中之包覆 中，係設有吸收光之光吸收體。 在作爲凹凸圖型傳送裝置之機能的檢測區域中，在包覆中 藉由設置光吸收體而將被測定對象之凹凸圖型以較高精度 傳送至拍攝裝置。另一方面，在照明區域中，在包覆中係未 設有光吸收體，因此，照明裝置所發出之照明光係效率爲佳 的被導光至被測定對象。此外，本發明之光纖光學平板藉由 具備有相關之照明區域，而在製作凹凸圖型檢測裝置方面， 可將照明裝置安裝至光纖光學平板之照明光射入面、而形成 可使裝置之小型化或薄型化。 本發明之光纖光學平板係爲，在照明區域中之包覆的折射 率係以低於在檢測區域中之包覆的折射率者爲佳。 200303994 爲使空氣中之外亂光即使是射入至核心亦不會藉由核心-包覆介面而進行全反射，軸線爲與光纖光學平面之表面以所 定角度（偏差角）斜交之光纖光學平板所導光之光，係可僅在 接觸至較射出面中之空氣折射率爲高的部份中來進行射 出。不過，藉由將在照明區域中之包覆的折射率，設成低於 在檢測區域中之包覆的折射率，藉此而縮小在照明區域中之 核心-包覆介面中的臨界角。因此，以使空氣中之外亂光於 檢測區域中不會被導光，即使在被設定有偏差角之光纖光學 平板中，在照明區域中，以較小角度（射入角）將核心-包覆介 面進行全板射的同時，於核心之中行進的照明光即使是在與 射出面中之空氣接處的部分下，亦可形成爲朝外部射出狀。 其結果，可更加有效率的照明至被檢測對象。 本發明之光纖光學平板係爲，於照明區域中之核心的折射 率，係以低於在檢測區域中之核心之折射率者爲佳。 藉由在這明區域中之核心的折射率設定成低於在檢測區 域中之核心的折射率，而可使在照明區域中之空氣-核心介 面中的臨界角增大。因此，即使在軸線與射出面斜角之光纖 光學平板中，於照明區域中，即使照明光在與射出面中之空 氣接觸之部份中，亦形成爲容易的射出至外部。其結果’可 更加有效率的照明至被檢測對象。 本發明之光纖光學平板係爲，於照明區域中所配置有多數 之核心的間隔，係以較在檢測區域中所配置有多數之核心的 間隔爲長者爲佳。 200303994 藉由將於照明區域中所配置有多數之核心的間隔長於在 檢測區域中所配置有多數之核心的間隔，而無須改變夾設於 核心間之包覆的厚度，便可提高在照明光之射入面中之核心 的面積比例，而提昇在照明區域中之照明光之射入效率。另 一方面，藉由相對的縮短於檢測區域中所配置有多數核心的 間隔，便增多於檢測區域之表面上的每單位面積之核心根 數，提昇在檢測區域中所傳送之凹凸圖型的精度。 本發明之凹凸圖型檢測裝置係爲，其特徵在於：具備有上 述光纖光學平板中任一方之一，且拍攝裝置爲安裝呈面對檢 測區域之一方的表面，而照明裝置則安裝呈面對配置有照明 區域之拍攝裝置之側的表面。 本發明之凹凸圖型檢測裝置係藉由具備有上述光纖光學 平板，而可實現效率爲佳之被測定對象之照明，此外，藉由 將照明裝置安裝至照明區域之照明光射入面上，而可使裝置 小型化或薄型化。 【實施方式】 以下，參照所附圖面，針對本發明之光纖光學平板及光纖 光學平板所適用之凹凸圖型檢測裝置的較佳實施例來進行 詳細的說明。 〔第1實施例〕 說明適用於有關本發明第1實施例之光纖光學平板1及光 纖光學平板1所適用之凹凸圖型檢測裝置2的構造。 第1圖係爲光纖光學平板1所適用之凹凸圖型檢測裝置2 200303994 之平面圖。第2圖係爲揭示於第1圖之凹凸圖型檢測裝置2 之Π-II線斷面圖。第3圖係爲揭示於第1圖之凹凸圖型檢 測裝置2之III-III線斷面圖。框體3係具備長方形之底面 32，在底面32之短邊方向外側之對向雙邊上各具備有4個 線纜端子34。且使拍攝元件40設置在底面32上之中央部 上。拍攝元件4係爲平板形狀，於拍攝元件4之上面（以下， 係將由底面3 2所見，設置有拍攝元件4之方向設爲上，與 其相反方向則設爲下）之中央部上具備有長方形之受光面 42，於拍攝元件4之上面中之受光面42周圍上具備有外寬 44。拍攝元件4之厚度係與後述之LED陣列5之厚度呈一 致。在此，拍攝元件4係被設置呈受光面42之長邊方向與 底面32之長邊方向爲一致狀。在第2圖及第3圖中，相當 於拍攝元件4之表面中之受光面42的部分以粗線顯示。拍 攝元件4係於受光面42之短邊方向外側之對向雙邊（外框44 上）各具備有4個線纜端子46。藉由將線纜端子46與框體3 之線纜端子34以接合線36所連接，藉此而使拍攝元件4進 行配線。 於框體3之底面32上之長邊方向之對向雙邊，係以與拍 攝元件4鄰接狀的設置有LED陣列5。作爲照明裝置機能之 LED陣列5係爲薄長板形狀，藉由適用該薄板狀之照明裝置 而可將凹凸圖型檢測裝置2進行薄型化。LED陣列5係被設 置呈長度方向與底面32之短邊方向呈一致狀。第4圖係爲 LED陣列5之正面圖。第5圖係爲揭示於第4圖之LED陣 200303994 列5之沿著V-V線剖面之斷面圖。LED陣列5係在底面具 備有長板形狀之印刷基板5 02。於印刷基板502上，沿著印 刷基板502之長度方向而配置多數之LED 5 04，再者，於端 部上設置電阻器5 06。LED504及電阻器506係以導線508 來配線。設置有LED 504及電阻器506之印刷基板502之表 面係爲，整體爲以環氧系透明樹脂5 1 0所被覆。 在拍攝元件4及LED陣列5之上設置有光纖光學平板1。 光纖光學平板1之表面係爲長方形，其短邊方向之長度係與 LED陣列5之長邊方向之長度爲一致，且較拍攝元件4之受 光面42之短邊方向的長度爲長。光纖光學平板1係爲，其 表面之長邊方向與框體3之底面2之長邊方向爲一致，且其 表面係覆蓋LED陣列5之上面整體及拍攝元件4之受光面 42整體，而配置呈部與線纜端子46接觸之狀態。如第3圖 所示，光纖光學平板1係爲一種多數光纖爲被捆紮成各個軸 線爲呈平行狀、且呈一體狀地聚合，在包覆中，多數之核心 係具有以所定之間隔來配置之構造。此外，光纖光學平板i 係爲’軸線（中心軸）以與光纖光學平板1之表面（端面）、或 是角度（偏差角）α ° ，呈斜交狀的偏差。在本實施例中，光 纖光學平板1之兩端面係形成爲平行。光纖光學平板1係爲 在其表面之長邊方向之中央部上，具備有已於包覆中配置光 吸收體之檢測區域1 2，於兩端部上，係具備有未於包覆中配 置光吸收體之照明區域1 4。在第3圖中，係將相當於光纖光 學平板1之中的檢測區域1 2部分係以雙重斜線來表示，且 200303994 將相當於照明區域1 4部分以單斜線來表示。在檢測區域1 2 之上面，形成有擷取被測定對象內部之散亂光的凹凸圖型輸 入面1 2 2，在檢測區域1 2之下面係形成有射出已導光之散亂 光（檢測光）之凹凸圖型樞出面124。在照明區域14之下面， 係形成有射出照明裝置所發出之照明光的照明光射入面 1 42，於照明區域1 4之上面，係形成有射出已導光之照明光 之照明光射出面144。 第6圖係爲揭示於第1圖之光纖光學平板1之正面圖。標 有第6圖之點狀區域係爲表示光纖光學平板1之表面中的凹 凸圖型輸入面1 2 2，而標有點狀以外之部分爲表示照明光射 出面144。光纖光學平板1係被設置呈，拍攝元件4之受光 面42整體爲與凹凸圖型輸出面124接觸，且LED陣列5爲 與照明光射入面142接觸。光纖光學平板1與拍攝元件4及 LED陣列5係以透明接著劑（環氧系或矽酮系樹脂）所接合。 第7圖係爲在檢測區域1 2中之光纖光學平板丨之局部放 大斷面圖。各光傳送路徑（以下，在光纖光學平板丨中，將 以核心及包圍該核心之包覆所構成之部分稱之爲「光傳送路 徑」。）於中心爲具有核心1 6 0，包覆1 6 1細密著包圍核心 1 6 0。再者，光吸收體1 6 2細密著包覆1 6 1。各光傳送路徑之 兩端面1 6 5係對於軸線1 64爲以角度（偏差角）α。而傾斜。 該偏差角α °係爲，即使光由空氣中射入核心1 6 〇，亦可設 定呈射入光不會藉由在核心160與包覆161之間的交界面來 進行全反射之角度。亦即，在所定之偏差角之下，由空 -12 - 200303994 氣射入至核心1 60之光係爲，於通過光傳送路路徑之端面 1 6 5之際，於折射角/3 °之中，以空氣-核心介面進行折射， 之後，以小於在核心-包覆介面中之臨界角的角度（射入角） 而到達核心-包覆介面。 偏差角α°係爲，使用特定之角度以。°而可以 。來表示。在此，α /係爲滿足下列公式（1)至（3)之角度。 不過，nQ係爲核心160之折射率，心係爲包覆161之折射率， na爲空氣之折射率。此外，0。°係爲在核心-包覆介面中之 臨界角，/3 /係爲由空氣中至光傳送路徑之端面1 6 5上，射 入角爲略90°所射入的光之折射角。 n〇 sin (9 c° = iij sin90 ° (在核心-包覆介面中之折射法 則）…⑴ n〇 sin β c° = n, s i η 9 0 ° (在空氣-核心介面中之折射法 則）…（2) α。。+(/3 / +90。）+ ( 90。- 0 c〇 ) = 180〇 …（3) 在考慮由公式（1)至（3)求出ae°後，上述偏差角α°之範 圍爲係以公式（4)所表示。 α。S a c 0 = s i it 1 (n i / η 0) - s i ιΓ 1 ( n a / η 0)…（4) 在照明區域1 4中，於相鄰之光傳送路徑之間係未夾射光 吸收體。構成照明區域1 4之光傳送路徑的核心與包覆，係 爲與構成檢測區域12之光傳送路徑之核心160及包覆16 1 爲同質之物。 其次，說明光纖光學平板1之製造方法。 200303994 藉由將包覆以光吸收體所被覆之光纖進行聚合，多蕊光纖 (MF)或多模光纖（MMF)係被製造成檢測區域用。此外，藉由 將包覆未以光吸收體所被覆之光纖進行聚合，多蕊光纖（MF) 或多模光纖（MMF)係被製造成照明區域用。不過，使用於檢 測區域用之多蕊光纖（MF)或多模光纖（MMF)之製造的光 纖、以及使用於照明區域用之多蕊光纖（MF)或多模光纖 (MMF)之製造的光纖係爲相同的外徑。檢測區域用之多蕊光 纖（MF)或多模光纖（MMF)、以及照明區域用之多蕊光纖（MF) 或多模光纖（MMF)係僅以必要高度而被整列在模具中。此 時，使用於檢測區域用之多蕊光纖（MF)或多模光纖（MMF)之 製造的光纖、以及使用於照明區域用之多蕊光纖（MF)或多模 光纖（MMF)之製造的光纖因係爲相同外徑，因此，將不會造 成在交界面的混亂。 已整列之多蕊光纖（MF)或多模光纖（MMF)，係以熱衝壓所 融著。 融著體系藉由被切片-硏磨，而完成光纖光學平板1。 其次，將凹凸圖型檢測裝置2檢測被測定對象表面之凹凸 圖型的動作進行說明。 第8圖所示係爲使作爲被測定對象之手指6置放於光纖光 學平板1之上的狀態示意圖。如第8圖所示，手指6之指腹 係被置放於光纖光學平板14之上，而用以覆蓋凹凸圖型輸 入面122及照明光射出面144。 LED陣列5發出之照明光係係由照明光射入面142而射 200303994 入至照明區域1 4中。已射入至照明區域1 4之照明光係藉由 照明區域1 4之光傳送路徑所導光、到達照明光射出面1 44。 已到達照明光射出面1 44之照明光係爲，在與照明光射出面 1 44中之手指6之指腹凸部接觸的部份中，爲形成射入手指 6內部之散亂光。另一方面，已到達照明光射出面1 44之照 明光係爲，在未於照明光射出面1 44中之手指6之指腹之凹 部的部分、亦即爲在空氣與照明光射出面1 44接觸的部分 上，爲以照明光射出面1 44來進行全反射。 第9圖係爲在照明光射出面1 44中，顯示照明光射出或反 射之態樣的示意圖。於第9圖所示之光傳送路徑之端面165a 係以與空氣接觸之光傳送路徑的端面表示，光傳送路徑之端 面165b係以與手指6接觸之光傳送路徑之端面表示。 參照第9圖，詳細說明在照明光射出面1 44中，照明光射 出或反射之過程。藉由照明區域1 4之光傳送路徑所導光之 照明光係爲，在大於核心-包覆介面之臨界角0。°的角度（射 入角）中，爲一面以核心-包覆介面進行全反射而一面行進於 核心160之中、到達照明光射出面144。 如第9圖所示，照明光係爲，於角度0 ° ( 4 0 2°…） 中，係以核心-包覆介面進行全反射而一面行進於核心1 60 之中後，便以射入角r ° ( r i ° 、r 2 °…）到達照明光射出面 144。射入角r °係以公式（5)來表示。 7 0 = 0。一 α。、φ。g 0 c。…（5) 在此，針對射入角r °與由空氣中以射入角爲略90°所射 -15- 200303994 入至光傳送路徑之端面165的光之折射角（於空氣-核心介面 (光傳送路徑之端面165 a)中之臨界角）/3。。之間的關係’係 藉由公式（3)及（5)所導出。 β c° = Θ c〇 — a，S Θ，— a。i φ。一 α 〇 = Ύ 〇 … 從而，在光傳送路徑之端面165a中，於核心160之中行 進的照明光係進行全反射。 另一方面，手指6之折射率係高於核心1 60之折射率，因 此，已到達光傳送路徑之端面165b之照明光係由核心160 射出、且可朝手指6之內部射入。 已射入至手指6之光係形成手指6內部之散亂光，其局部 係到達至凹凸圖型輸入面122。於凹凸圖型輸入面122中之 手指6之指腹的凹部部分、亦即爲在空氣與凹凸圖型輸入面 1 22接觸之部份中，手指6內部之散亂光係爲，在通過手指 6與凹凸圖型輸入面122之間的空氣層後，射入至核心160。 如此，已射入核心160之光係不會藉由核心-包覆介面來進 行全反射，而在過包覆1 6 1之後則被吸收至光吸收體1 62。 另一方面，凹凸圖型輸入面122中之位於手指6之指腹的凸 部與凹凸圖型輸入面1 22接觸之部份上，由手指6射入至核 心1 6 0之檢測光係爲，一面以核心-包覆介面來進行全反射， 且一面行進於合先160之中、到達至凹凸圖型輸出面124。 第1 0圖所示係爲由手指6射入檢測區域1 2之檢測光，在 藉由檢測區域1 2之光傳送路徑所導光之態樣的示意圖。與 第9圖相同的，光傳送路徑之端面1 6 5 a係以與空氣接觸之 -16- 200303994 光傳送路徑的端面表示，光傳送路徑之端面165b係以與手 指6接觸之光傳送路徑之端面表示。 參照第1 〇圖，詳細說明由手指6射入至檢測區域1 2之檢 測光爲藉由檢測區域1 2之光傳送路徑所導光之過程。 在位於凹凸圖型輸入面1 22中之手指6之指腹的凹部之部 分上，手指6內部之散亂光係爲，通過手指6與光傳送路徑 之端面165a之間的空氣層，而到達光傳衙徑之端面165a。 如前述，在檢測區域1 2之光傳送路徑中，軸線係對於光傳 送路徑之端面165a因係以於公式（4)所示之角度範圍的偏差 角α °所傾斜，故而通過空氣層、由光傳送路徑之端面165a 射入至核心1 60之光係形成爲，以小於在核心-包覆介面中 之臨界角0 e°之角度（射入角）而到達核心-包覆介面，且不 會以核心-包覆介面來進行全反射，而漏出至包覆1 6 1。透過 包覆1 6 1、到達光吸收體1 62之光係被光吸收體1 62所吸收 而衰減。因此，已射入至位於凹凸圖型輸入面122中之手指 6之指腹的凹部之部分（光傳送路徑之端面165 a)的光，係未 到達至凹凸圖型輸出面124。 在與凹凸圖型輸入面122中之手指6之指腹的凸部所接觸 的部份中，手指6之折射率係高於核心1 60之折射率，因此 在折射角/3 °之角度中係不會受到限制。從而，由手指6射 入至光傳送路徑之端面165b之檢測光的一部份，係以大於 在核心-包覆介面中之臨界角Θ之角度（射入角）而到達於 核心-包覆介面。該檢測光係爲，一面以核心-包覆介面進行 -17- 200303994 全反射，且一面在核心1 60之中行進、到達至凹凸圖型輸出 面1 24。於檢測光之中，以小於在核心-包覆介面中之臨界角 0 /之角度（射入角）而到達於核心-包覆介面之物係漏出於 勹覆161。不過，因在包覆161之周圍配置有光吸收體161， 故而漏出於包覆1 6 1之檢測光係不會漏出至鄰接之光傳送路 徑。 如上所述，藉由導光檢測光之檢測區域1 2之動作，於凹 凸圖型射入面1 24上，係出現有對應於手指6之指腹的凹凸 圖型之檢測光之明暗圖型。 凹凸圖型射入面124係與拍攝元件4之受光面42接合， 對應於手指6之指腹的凹凸圖型之檢測光之明暗圖型，係藉 由拍攝元件4所檢測而出。 在本實施例中，藉由使LED陣列5接合至照明光射入面 142，而使凹凸圖型檢測裝置2小型化、薄型化。此外，照 明光係藉由照明區域1 4之光傳送路徑而被導光至照明光射 出面1 44，而可效率爲佳的照明作爲被測定對象之手指6。 〔第2實施例〕 有關本發明之第2實施例之光纖光學平板7中，於照明區 域74中之包覆之折射率n2係低於在光纖光學平板1中之包 覆的折射率n i。光纖光學平板7之構造在其他要點方面係與 光纖光學平板1之構造相同。 在照明區域74中之包覆的之折射率n2係低於在光纖光學 平板1中之包覆的折射率η!，因此，如公式（7)所示，在照 200303994 明區域74中’在核心-包覆介面中之臨界角7?。係小於在光 纖光學平板1之核心-包覆介面中之臨界角Θ。° 。 ；7 c 〇 = s i η-1 (η2/η0) < 0 c 〇 = s iη-1 (η 丨 /η〇)…（7 ) 第1 1圖係爲在照明光射出面744中，顯示照明光射出或 反射之態樣的示意圖。 以照明區域74之光傳送路徑所導光之照明光之一部份係 爲，在小於在光纖光學平板1之核心-包覆介面中之臨界角 Θ /的角度（射入角）中，爲一面以核心-包覆介面進行全反 射，且一面在核心之中行進、到達至照明光射出面744。 在已滿足公式（8)角度（射入角）°中，以核心-包覆介面 進行全反射之照明光，係以小於在空氣-核心檢面中之臨界 角冷/的角度（射入角）而到達至照明光射出面744。 c。“。< 0 c〇 +U 〇 — a c。）…（8) 從而，在滿足藉由照明區域74之光傳送路徑所導光之照 明光中之公式（8)的角度（射入角）力，以核心-包覆介面來進 行全反射之物，即使在與照明光射出面744之中的空氣接觸 之部分上，亦可射出至外部。因此，照明裝置係可更有效率 的照明被測定對象。 〔第3實施例〕 有關本發明之第3實施例之光纖光學平板8中，於照明區 域84中之包覆之折射率n3以及包覆之折射率n4，係分別低 於在光纖光學平板1中之核心的折射率nQ及包覆的折射率 ~。光纖光學平板8之構造在其他要點方面係與光纖光學平 200303994 板1之構造相同。 在照明區域8 4中之包覆的之折射率n3係低於在檢測區域 8 2中之核心的折射率（於光纖光學平板1中之核心的折射 率）nQ。從而，在照明區域84中，於空氣-核心介面中之臨界 角Γ °係形成爲大於在檢測區域8 2之空氣-核心介面中之臨 界角（於光纖光學平板1之空氣-核心介面中之臨界角 。。此外，在照明區域84中之包覆的折射率n4係被設定成， 在照明區域84之核心-包覆介面中之臨界角係等於檢測區域 82之核心-包覆介面中之臨界角（光纖光學平板1中之核心-包覆介面中的臨界角）0。° 。亦即，在照明區域84中之包覆 的折射率心係以公式（9)所表示。 n4= n3 * sin0 c0 、n3< n0··. (9) 第12圖係爲在照明光射出面844中，顯示照明光射出或 反射之態樣的示意圖。 一面以照明區域84之核心-包覆介面進行全反射，且一面 在核心之中行進的照明光，係以Γ °而到達照明光射出面 844。於照明區域84之核心-包覆介面中之臨界角，係被設 定呈與光纖光學平板1之核心-包覆介面朱之臨界角Θ。°相 等，因此，即使是照明區域84，亦可成立於前述公式（6)所 示之關係。亦即，導出下列公式（1 〇)。 n r 0 …（1〇) 不過，在照明區域84中’於空氣-核心介面中之臨界角r °係大於在光纖光學平板1之空氣-核心介面中之臨界角；5。 200303994 ° ，因此，朝向局部照明光之照明光射面844之射入角Γ ° 係形成爲小於在照明區域8 4之空氣-核心介面中之臨界角t ° 。該照明光係爲，即使在與照明光射出面844中之空氣接 觸的部分上亦可射出至外部。因此，照明裝置係可更有效率 的照明被測定對象。 在上述第1至3實施例中，於照明區域中，將配置有多數 核心之間隔（核心之中心軸所配置的間隔），設成較在檢測區 域中多數核心所配置之間隔（核心之中心軸所配置的間隔） 爲長後，更可將照明區域中之核心斷面積形成爲大於檢測區 域中之核心斷面積，故而爲佳。當使用於照明區域用之多蕊 光纖（MF)或多模光纖（MMF)之製造的光纖之包覆厚度、以及 使用於檢測區域用之多蕊光纖（MF)或多模光纖（MMF)之製 造的光纖之包覆與光吸收體之厚度爲相同時，藉由將在照明 區域中之核心之徑値設成大於在檢測區域中之核心之徑 値，亦即，藉由在照明區域中將核心所配置之間隔相對性的 增長，便可提升在照明光射入面中之核心的面積比例，而提 昇在照明區域中之照明光之射入效率。力一方面，藉由在檢 測區域中將核心所配置之間隔相對性的縮短，在凹凸圖型輸 入面及凹凸圖型輸出面中之每單位面積的核心之根數便會 增多，而提昇在檢測區域中所傳送之凹凸圖型之精度。 在上述第1至3實施例中，亦可將LED陣列安裝在光纖 光學平板上，以使LED陣列之照明方向與照明區域之光傳 送路徑之方向呈一致。第13圖所示係爲使LED陣列20安 200303994 裝至光纖光學平板1 0之態樣的槪念圖。LED陣列20係爲， 以使照明方向爲與照明區域1 04之光傳送路徑之方向呈一致 狀地而被配置在照明光射入面]042之下方。LED陣列20與 照明光射入面1 042均以透明樹脂30所接合。且使受光面40 接合至檢測區域102之凹凸圖型輸出面1 024上。藉由使LED 陣列之照明方向與照明區域之光傳送路徑之方向爲一致 狀，而提昇朝向照明光之照明區域54之射入效率。 在上述第1至3實施例中，亦可將照明光射入面與LED 陣列之間夾設有在核心之折射率、包覆之折射率、垂直於核 心之中心軸的斷面積、核心所設置之間隔中至少一方爲相異 的其他之光纖光學平板（中間光纖光學平板）。第1 4圖所示 係爲，LED陣列60爲夾持中間光纖光學平板70，且被配置 在照明光射入面542之下方之態樣的槪念圖。中間光纖光學 平板7 0係爲，被設定呈於光纖光學平板5 0相同之偏差角。 藉由調整構成中間光纖光學平板70之核心及包覆之折射 率，而可使朝向照明光之照射區域54之射入效率提昇。再 者，即使在凹凸圖型輸出面524與受光面80之間，亦可夾 射中間光纖光學平板7〇。第〗5圖所示係在LED陣列60及 受光面80與光纖光學平板50之間，夾設有中間光纖光學平 板70之態樣的槪念圖。藉由調整構成中間光纖光學平板7〇 之核心及包覆之折射率，而可使朝向照明光之照射區域5 4 之射入效率及朝向凹凸圖型之受光面80之輸出效率提昇。 此外，作爲照明裝置，較佳爲採用較LED陣列5爲更薄 200303994 型之嵌入型LED陣列9。第16圖係爲嵌入型LED陣列9之 正面圖。第17圖係爲沿著揭示於第13圖之嵌入型LED陣 列之沿著XIV-XIV線剖面之斷面圖。在長板形狀之印刷基板 902上，沿著印刷基板902之長度方向，係呈多數形成有用 以嵌入LED904之嵌入孔906。構成嵌入孔906之底面的底 面板908係以焊接安裝在印刷基板902上。於底面板908上 設置有L E D 9 0 4，且以導線9 1 0所配置。藉由適用LE D陣列 9而可製作出更加薄型之凹凸圖型檢測裝置。 〔產業上利用之可能性〕 本發明係例如可適用於指紋檢測器。 【圖式簡單說明】 第1圖係爲光纖光學平板1所適用之凹凸圖型檢測裝置2 之平面圖。 第2圖係爲揭示於第1圖之凹凸圖型檢測裝置2之η_Π 線斷面圖。 第3圖係爲揭示於第1圖之凹凸圖型檢測裝置2之ηΐ_ΠΙ 線斷面圖。 第4圖係爲LED陣列5之正面圖。 第5圖係爲揭示於第4圖之L E D陣列5之沿著v - V線剖 面之斷面圖。 第6圖係爲掲示於第1圖之光纖光學平板1之正面圖。 第7圖係爲在檢測區域1 2中之光纖光學平板1之局部放 大斷面圖。 -23- 200303994 第8圖所示係爲使作爲被測定對象之手指6置放於光纖光 學平板1之上的狀態示意圖。 第9圖係爲在照明光射出面1 44中，顯示照明光射出或反 射之態樣的示意圖。 第1 〇圖所示係爲由手指6射入檢測區域1 2之檢測光，在 藉由檢測區域1 2之光傳送路徑所導光之態樣的示意圖。 第Π圖係爲在照明光射出面744中，顯示照明光射出或 反射之態樣的示意圖。 第12圖係爲在照明光射出面844中，顯示照明光射出或 反射之態樣的示意圖。 第13圖所示係爲使LED陣列20安裝至光纖光學平板10 之態樣的槪念圖。 第14圖所示係爲，LED陣列60爲夾持中間光纖光學平 板7 〇，且被配置在照明光射入面5 4 2之下方之態樣的槪念 圖。 第15圖所示係在LED陣列60及受光面80與光纖光學平 板5 0之間，夾設有中間光纖光學平板70之態樣的槪念圖。 第16圖係爲嵌入型LED陣列9之正面圖。 第1 7圖係爲沿著揭示於第1 3圖之嵌入型LED陣列之沿 著XIV-XIV線剖面之斷面圖。 【主要部分之代表符號說明】 1 :光纖光學平板 2 :凹凸圖型檢測裝置 -24- 200303994 3 :框體 4 :拍攝元件200303994 A The present invention is to solve the above problems, and its purpose is to provide a fiber optic flat plate and a concave-convex pattern detection device suitable for the optical fiber flat plate, which utilizes the unevenness of scattered light inside the measured object. In the pattern detection device, it is possible to reduce the size or thickness of the device, and to illuminate the measurement target with a high efficiency of the lighting device. In order to achieve the above-mentioned object, the optical fiber flat plate of the present invention is characterized in that: a concave-convex pattern detection device adapted to detect a concave-convex pattern of an object to be measured; each axis is obliquely intersecting with both end faces; Most of the cores in the coating are arranged at predetermined intervals. In the optical fiber optical plate that has been formed into a shape, a detection area including a photographing device facing the concave-convex pattern and a connection to the detection area are included. It is constituted by the illumination area of the illumination device that faces the measurement object at the same time. In the coating in the detection area, a light absorber that absorbs light is provided. In the detection area that functions as a bump pattern transfer device, the bump pattern of the object to be measured is transferred to the imaging device with high accuracy by providing a light absorber during the coating. On the other hand, in the illumination area, no light absorber is provided in the coating. Therefore, the illumination light emitted by the illumination device is guided to the object to be measured with high efficiency. In addition, the fiber optic flat panel of the present invention is provided with an associated illumination area, and in the production of a concave-convex pattern detection device, the illumination device can be mounted on the illumination light incident surface of the fiber optic flat panel to form a compact device Thin or thin. In the optical fiber optical plate of the present invention, the refractive index of the coating in the illumination area is preferably lower than the refractive index of the coating in the detection area. 200303994 In order to make the stray light outside and in the air even when it enters the core, it will not be totally reflected by the core-cladding interface. The light guided by the plate can be emitted only when it comes into contact with the part with a higher refractive index than the air in the exit surface. However, by setting the refractive index of the cladding in the illumination area to be lower than the refractive index of the cladding in the detection area, the critical angle in the core-cladding interface in the illumination area is reduced. Therefore, in order to prevent light from being scattered outside the air in the detection area, even in a fiber-optic optical plate with a deviation angle set, in the illumination area, the core is at a small angle (incident angle)- While the covering interface performs full-board emission, the illumination light traveling in the core can be formed to be emitted outward even if it is under the part in contact with the air in the emission surface. As a result, the detection target can be illuminated more efficiently. The optical fiber flat plate of the present invention is such that the refractive index of the core in the illumination area is preferably lower than the refractive index of the core in the detection area. By setting the refractive index of the core in this bright region lower than that of the core in the detection region, the critical angle in the air-core interface in the illuminated region can be increased. Therefore, even in a fiber-optic optical flat plate with an oblique angle between the axis and the exit surface, in the illumination area, even if the illumination light is in a portion in contact with air in the exit surface, it is easily emitted to the outside. As a result, it becomes possible to illuminate the object more efficiently. The optical fiber optical flat plate of the present invention is such that the interval between the plurality of cores arranged in the illumination area is better than the interval between the plurality of cores arranged in the detection area. 200303994 The interval between the cores with the majority in the illumination area is longer than the interval with the cores in the detection area without changing the thickness of the coating sandwiched between the cores, which can improve the illumination light. The area ratio of the core in the incident surface improves the incidence efficiency of the illumination light in the illumination area. On the other hand, by relatively shortening the interval where a large number of cores are arranged in the detection area, the number of cores per unit area on the surface of the detection area is increased, and the convex-concave pattern transmitted in the detection area is improved. Precision. The concave-convex pattern detection device of the present invention is characterized in that it is provided with any one of the above-mentioned optical fiber optical flat plates, the photographing device is installed on a surface facing one side of the detection area, and the lighting device is installed on a surface facing The surface on the side of the imaging device where the illumination area is arranged. The concave-convex pattern detection device of the present invention is provided with the above-mentioned fiber-optic optical plate, and can realize the illumination of the object to be measured with better efficiency. In addition, the illumination device is mounted on the illumination light incident surface of the illumination area. The device can be miniaturized or thinned. [Embodiment] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the concave-convex pattern detection device to which the optical fiber optical plate and the optical fiber optical plate of the present invention are applied will be described in detail. [First Embodiment] The structure of a concave-convex pattern detection device 2 applicable to the optical fiber optical plate 1 and the optical fiber optical plate 1 according to the first embodiment of the present invention will be described. FIG. 1 is a plan view of a concave-convex pattern detection device 2 200303994 to which the optical fiber optical flat plate 1 is applied. FIG. 2 is a cross-sectional view taken along the line II-II of the uneven pattern detection device 2 disclosed in FIG. 1. Fig. 3 is a sectional view taken along the line III-III of the concave-convex pattern detecting device 2 disclosed in Fig. 1. The frame 3 is provided with a rectangular bottom surface 32, and four cable terminals 34 are provided on opposite sides of the bottom surface 32 in the short side direction. The imaging element 40 is provided on a central portion of the bottom surface 32. The imaging element 4 has a flat plate shape, and a rectangle is provided on the center of the imaging element 4 (hereinafter, the direction in which the imaging element 4 is set is viewed from the bottom surface 32 and the opposite direction is set to the bottom). The light receiving surface 42 is provided with an outer width 44 around the light receiving surface 42 of the upper surface of the imaging element 4. The thickness of the imaging element 4 corresponds to the thickness of the LED array 5 described later. Here, the imaging element 4 is provided so that the long-side direction of the light-receiving surface 42 and the long-side direction of the bottom surface 32 coincide with each other. In Figs. 2 and 3, a portion corresponding to the light-receiving surface 42 of the surface of the imaging element 4 is shown by a thick line. The imaging element 4 is provided with four cable terminals 46 each on the opposite sides (on the outer frame 44) on the outer side in the short-side direction of the light-receiving surface 42. The imaging element 4 is wired by connecting the cable terminal 46 and the cable terminal 34 of the housing 3 with a bonding wire 36. On the opposite sides of the long side direction on the bottom surface 32 of the frame body 3, an LED array 5 is provided adjacent to the photographing element 4. The LED array 5 as a function of the lighting device has a thin long plate shape. By applying the thin plate-shaped lighting device, the concave-convex pattern detection device 2 can be made thin. The LED array 5 is arranged in such a manner that the length direction thereof coincides with the short side direction of the bottom surface 32. FIG. 4 is a front view of the LED array 5. FIG. 5 is a cross-sectional view of the LED array 200303994 column 5 along V-V line disclosed in FIG. 4. The LED array 5 is provided with a printed board 502 in the shape of a long plate on the bottom mask. On the printed substrate 502, a plurality of LEDs 504 are arranged along the length direction of the printed substrate 502, and a resistor 506 is provided on the end portion. The LED 504 and the resistor 506 are wired with a lead wire 508. The surface of the printed circuit board 502 provided with the LED 504 and the resistor 506 is such that the entire surface is covered with an epoxy-based transparent resin 5 10. A fiber optic flat plate 1 is provided on the imaging element 4 and the LED array 5. The surface of the optical fiber flat plate 1 is rectangular, and the length in the short-side direction is consistent with the length in the long-side direction of the LED array 5, and is longer than the length in the short-side direction of the light receiving surface 42 of the imaging element 4. The optical fiber flat plate 1 is arranged such that the direction of the long side of the surface is consistent with the direction of the long side of the bottom surface 2 of the frame 3, and its surface covers the entire upper surface of the LED array 5 and the entire light receiving surface 42 of the imaging element 4, and is arranged The part is in a state of being in contact with the cable terminal 46. As shown in FIG. 3, the fiber optic flat plate 1 is a type in which most optical fibers are bundled so that each axis is parallel and integrated in a single body. In the coating, most of the cores are arranged at a predetermined interval. Of the structure. In addition, the fiber optic flat plate i is an axis (central axis) that is skewed obliquely from the surface (end face) or angle (deviation angle) α ° of the fiber optic flat plate 1. In this embodiment, both end surfaces of the optical fiber flat plate 1 are formed in parallel. The optical fiber flat plate 1 is provided with a detection area 12 in which a light absorber has been arranged in a cladding on a central portion in a longitudinal direction of a surface thereof, and is provided in the cladding without a cladding on both ends. Illumination area of light absorber 1 4. In Fig. 3, the part corresponding to the detection area 12 in the optical fiber optical panel 1 is represented by a double oblique line, and 200303994 is equivalent to the illumination area 14 as a single oblique line. Above the detection area 1 2 is formed a concave-convex pattern input surface 1 2 2 for capturing scattered light inside the object to be measured, and below the detection area 12 is formed scattered light that emits guided light (detection Light) of the concave-convex pattern pivot surface 124. Below the illumination area 14 is formed an illumination light incident surface 1 42 that emits illumination light emitted by the illumination device, and above the illumination area 14 is formed an illumination light emission surface that emits guided light. 144. Fig. 6 is a front view of the fiber optic flat plate 1 disclosed in Fig. 1. The dot-shaped area marked with FIG. 6 is a concave-convex-shaped input surface 1 2 2 in the surface of the optical fiber optical flat plate 1, and the portion other than the dot-shaped area is an illuminating light exit surface 144. The fiber optic flat panel 1 is provided so that the entire light receiving surface 42 of the imaging element 4 is in contact with the concave-convex pattern output surface 124, and the LED array 5 is in contact with the illumination light incident surface 142. The optical fiber flat plate 1 and the imaging element 4 and the LED array 5 are bonded with a transparent adhesive (epoxy-based or silicone-based resin). Fig. 7 is a partially enlarged cross-sectional view of the fiber optic flat plate in the detection area 12; Each optical transmission path (hereinafter, in the optical fiber optical plate 丨, a portion composed of a core and a coating surrounding the core is referred to as a "light transmission path".) The center has a core 1 6 0, and a cover 1 6 1 closely surrounds the core 1 6 0. In addition, the light absorber 1 6 2 is finely covered with 1 6 1. The two end faces 1 6 5 of each light transmission path are angles (deviation angles) α with respect to the axis 1 64. While leaning. This deviation angle α ° is such that even if light enters the core 160 from the air, the angle at which the incident light does not undergo total reflection through the interface between the core 160 and the cover 161 can be set. That is, below the predetermined deviation angle, the light system from the air-12-200303994 gas incident to the core 1 60 is at the refraction angle / 3 ° as it passes through the end face of the light transmission path 1 6 5 In the process, the air-core interface is used for refraction, and then the core-clad interface is reached at an angle (incident angle) smaller than the critical angle in the core-clad interface. The deviation angle α ° is a specific angle. ° and can. To represent. Here, α / is an angle satisfying the following formulae (1) to (3). However, nQ is the refractive index of core 160, heart is the refractive index of cladding 161, and na is the refractive index of air. In addition, 0. ° is the critical angle in the core-cladding interface, and / 3 / is the refraction angle of the light incident from the air to the end face of the light transmission path 1 65 at an angle of approximately 90 °. n〇sin (9 c ° = iij sin90 ° (refraction law in core-cladding interface) ... ⑴ n〇sin β c ° = n, si η 9 0 ° (refractive law in air-core interface) … (2) α… + (/ 3 / +90.) + (90.- 0 c〇) = 180〇 (3) After considering ae ° from formulas (1) to (3), the above The range of the deviation angle α ° is expressed by the formula (4). Α. S ac 0 = si it 1 (ni / η 0)-si ΓΓ 1 (na / η 0) ... (4) In the lighting area 1 4 In the light transmission path, there is no light absorbing body sandwiched between adjacent light transmission paths. The core and the cover of the light transmission path constituting the illumination area 14 are the core 160 and the cover of the light transmission path constituting the detection area 12. 16 1 is a homogeneous substance. Next, the manufacturing method of the optical fiber flat plate 1 will be described. 200303994 Multi-core fiber (MF) or multi-mode fiber (MMF) is coated by polymerizing an optical fiber covered with a light absorber. Manufactured for detection area. In addition, multi-core fiber (MF) or multi-mode fiber (MMF) is manufactured for illumination area by polymerizing the optical fiber that is not covered with a light absorber. However, optical fibers manufactured using multi-core optical fibers (MF) or multi-mode optical fibers (MMF) for detection areas, and optical fibers manufactured using multi-core optical fibers (MF) or multi-mode fibers (MMF) for lighting areas The same outer diameter. Multi-core fiber (MF) or multi-mode fiber (MMF) for detection area, and multi-core fiber (MF) or multi-mode fiber (MMF) for lighting area are only required height The entire array is in the mold. At this time, the optical fiber manufactured by the multi-core optical fiber (MF) or the multi-mode optical fiber (MMF) used for the detection area and the multi-core optical fiber (MF) or the multi-mode optical fiber used by the illumination area ( The optical fiber manufactured by MMF) has the same outer diameter, so it will not cause confusion at the interface. The multi-core optical fiber (MF) or multi-mode optical fiber (MMF) that has been arranged is fused by hot stamping. The fusion system is sliced-honed to complete the optical fiber optical plate 1. Next, the operation of the concave-convex pattern detection device 2 to detect the concave-convex pattern on the surface of the object to be measured will be described. The finger 6 of the object to be measured is placed on the fiber optic flat plate 1 As shown in Fig. 8, the abdomen of the finger 6 is placed on the optical fiber flat plate 14 to cover the concave-convex pattern input surface 122 and the illumination light exit surface 144. The LED array 5 emits The illumination light is transmitted from the illumination light incident surface 142 and 200303994 into the illumination area 14. The illumination light that has entered the illumination area 14 is guided by the light transmission path of the illumination area 14 and reaches the illumination. Light exiting surface 1 44. The illuminating light that has reached the illuminating light emitting surface 1 44 is a part of the contact with the convex portion of the finger abdomen of the finger 6 in the illuminating light emitting surface 1 44 to form scattered light that enters the inside of the finger 6. On the other hand, the illuminating light that has reached the illuminating light emitting surface 1 44 is the portion that is not in the recess of the fingertip of the finger 6 in the illuminating light emitting surface 1 44, that is, the air and the illuminating light emitting surface 1. The part in contact with 44 is totally reflected by the illumination light exit surface 1 44. Fig. 9 is a schematic view showing the state in which the illumination light is emitted or reflected on the illumination light emitting surface 144. The end face 165a of the light transmission path shown in Fig. 9 is represented by the end face of the light transmission path in contact with air, and the end face 165b of the light transmission path is represented by the end face of the light transmission path in contact with the finger 6. Referring to Fig. 9, the process of emitting or reflecting illumination light on the illumination light exit surface 1 44 will be described in detail. The illumination light guided by the light transmission path of the illumination area 14 is at a critical angle 0 greater than the core-cladding interface. In the angle (incident angle) of the angle, the core-cladding interface is used for total reflection while traveling in the core 160 to reach the illumination light exit surface 144. As shown in Fig. 9, the illumination light system is: at an angle of 0 ° (4 0 2 ° ...), it is totally reflected by the core-clad interface, while one side travels into the core 1 60, and then enters The angles r ° (ri °, r2 ° ...) reach the illumination light exit surface 144. The angle of incidence r ° is expressed by formula (5). 7 0 = 0. A. , Φ. g 0 c. … (5) Here, for the angle of incidence r ° and the angle of refraction of the light incident from the air at an angle of approximately 90 ° -15-200303994 the light entering the end face 165 of the light transmission path (at the air-core interface) (Critical angle in the end face 165 a) of the light transmission path) / 3. . The relationship 'is derived by the formulas (3) and (5). β c ° = Θ c〇 — a, S Θ, — a. i φ. -Α 〇 = Ύ 〇 ... Thus, in the end surface 165a of the light transmission path, the illumination light system traveling in the core 160 is totally reflected. On the other hand, the refractive index of the finger 6 is higher than the refractive index of the core 1 60. Therefore, the illumination light that has reached the end surface 165b of the light transmission path is emitted from the core 160 and can enter the inside of the finger 6. The light that has been incident on the finger 6 forms scattered light inside the finger 6, and a part of it reaches the concave-convex pattern input surface 122. In the concave portion of the fingertip of the finger 6 in the concave-convex pattern input surface 122, that is, in the portion where the air is in contact with the concave-convex pattern input surface 1, 22, the scattered light inside the finger 6 is that it passes through The air layer between 6 and the concave-convex pattern input surface 122 enters the core 160. In this way, the light system that has entered the core 160 will not be totally reflected by the core-cladding interface, but will be absorbed to the light absorber 162 after being over-clad 16 1. On the other hand, on the portion of the convex pattern input surface 122 where the convex portion located on the fingertip of the finger 6 contacts the convex pattern input surface 1 22, the detection light incident from the finger 6 to the core 1 6 0 is On the one hand, the core-clad interface is used for total reflection, and on the other hand, it travels in the joint 160 and reaches the bump output surface 124. Fig. 10 is a schematic diagram showing the state of the detection light emitted by the finger 6 into the detection area 12 and guided by the light transmission path of the detection area 12; As in FIG. 9, the end face of the light transmission path 1 6 5 a is represented by the end of the light transmission path -16- 200303994, and the end face of the light transmission path 165 b is represented by the light transmission path of the finger 6 End face indicated. Referring to FIG. 10, the process in which the detection light incident from the finger 6 to the detection area 12 is guided by the light transmission path of the detection area 12 will be described in detail. The scattered light inside the finger 6 on the concave portion of the fingertip of the finger 6 in the bump pattern input surface 1 22 is reached through the air layer between the finger 6 and the end surface 165a of the light transmission path and reaches Optical transmission path 165a. As mentioned above, in the light transmission path of the detection area 12, the axis is inclined with respect to the end surface 165a of the light transmission path by the deviation angle α ° in the angular range shown in formula (4). The end of the light transmission path 165a incident on the core 160 is formed to reach the core-cladding interface at an angle (incident angle) smaller than the critical angle 0 e ° in the core-cladding interface, and does not The core-clad interface is used for total reflection, and leaks out to the cladding 1 6 1. The light transmitted through the coating 1 6 and reaching the light absorber 1 62 is absorbed by the light absorber 1 62 and attenuated. Therefore, the light that has entered the concave portion (the end face 165a of the light transmission path) of the fingertip of the finger 6 on the bump pattern input surface 122 does not reach the bump pattern output surface 124. The refractive index of the finger 6 is higher than the refractive index of the core 160 in the portion in contact with the convex portion of the fingertip of the finger 6 in the concave-convex pattern input surface 122. Department will not be restricted. Therefore, a part of the detection light incident from the finger 6 to the end face 165b of the light transmission path reaches the core-clad at an angle (incident angle) larger than the critical angle Θ in the core-clad interface. interface. The detection light is: -17- 200303994 total reflection is performed on the core-cladding interface, and it travels in the core 160 and reaches the bump-type output surface 1 24. In the detection light, the material reaching the core-cladding interface at an angle (incident angle) smaller than the critical angle 0 / in the core-cladding interface leaks out of the cover 161. However, since the light absorber 161 is arranged around the cover 161, the detection light leaking out of the cover 161 does not leak to the adjacent light transmission path. As described above, by the operation of the detection area 12 of the light guide detection light, a light-dark pattern of detection light corresponding to the concave-convex pattern of the fingertips of the fingers 6 appears on the concave-convex pattern incident surface 1 24. . The concave-convex pattern incident surface 124 is connected to the light-receiving surface 42 of the imaging element 4, and the light and dark pattern of the detection light corresponding to the concave-convex pattern of the fingertip of the finger 6 is detected by the imaging element 4. In this embodiment, the LED array 5 is bonded to the illumination light incident surface 142, so that the bump pattern detection device 2 is miniaturized and thinned. In addition, the illuminating light is guided to the illuminating light exit surface 144 through the light transmission path of the illuminating area 14 and the illuminating light with better efficiency can be used as the finger 6 of the object to be measured. [Second Embodiment] In the optical fiber optical plate 7 according to the second embodiment of the present invention, the refractive index n2 of the coating in the illumination area 74 is lower than the refractive index n i of the coating in the optical fiber optical plate 1. The structure of the fiber optic flat plate 7 is the same as the structure of the fiber optic flat plate 1 in other points. The refractive index n2 of the coating in the illumination region 74 is lower than the refractive index η! Of the coating in the optical fiber flat plate 1. Therefore, as shown in formula (7), Critical angle 7 ° in the core-cladding interface. Is smaller than the critical angle Θ in the core-cladding interface of the optical fiber flat plate 1. °. ; 7 c 〇 = si η-1 (η2 / η0) < 0 c 〇 = s iη-1 (η 丨 / η〇) ... (7) Figure 11 shows the display on the illumination light exit surface 744. Schematic diagram of illumination light emitted or reflected. A part of the illumination light guided by the light transmission path of the illumination region 74 is, in an angle (incident angle) smaller than the critical angle Θ / in the core-cladding interface of the optical fiber optical plate 1, which is One side is totally reflected by the core-cladding interface, and the other side travels in the core to reach the illumination light exit surface 744. In the angle (incident angle) ° which satisfies the formula (8), the illumination light that is totally reflected by the core-cladding interface is an angle (incident angle) that is smaller than the critical angle in the air-core inspection surface ) And reach the illumination light exit surface 744. c. ". ≪ 0 c〇 + U 〇- ac.) ... (8) Thus, an angle (incident angle) in the illumination light that satisfies the light guided by the light transmission path of the illumination region 74 The object that is totally reflected by the core-cladding interface can be emitted to the outside even on the part in contact with the air in the illumination light exit surface 744. Therefore, the lighting device can more efficiently illuminate the surface. [Measurement Example] [Third Embodiment] In the optical fiber optical plate 8 according to the third embodiment of the present invention, the refractive index n3 of the coating in the illumination area 84 and the refractive index n4 of the coating are lower than those of the optical fiber, respectively. The refractive index nQ of the core in the optical plate 1 and the refractive index of the coating ~. The structure of the optical fiber optical plate 8 is otherwise the same as the structure of the optical fiber flat 200303994 plate 1. In the lighting area 8 4 The refractive index n3 is lower than the refractive index of the core in the detection area 82 (refractive index of the core in the optical fiber flat plate 1) nQ. Therefore, in the illumination area 84, the critical angle in the air-core interface Γ ° is formed larger than 8 2 in the detection area Critical angle in the air-core interface (critical angle in the air-core interface of the fiber optic flat panel 1). In addition, the refractive index n4 of the coating in the illumination area 84 is set to be the core in the illumination area 84. -The critical angle in the cladding interface is equal to the core of the detection area 82-the critical angle in the cladding interface (the core in the fiber optic flat panel 1-the critical angle in the cladding interface) 0 °. That is, in the illumination area The refractive index of the coating in 84 is expressed by the formula (9): n4 = n3 * sin0 c0, n3 < n0 ··. (9) Figure 12 shows the illumination light output surface 844 showing the illumination light A schematic diagram of the state of emission or reflection. One side is totally reflected by the core-cladding interface of the illumination area 84, and the illumination light traveling in the core reaches the illumination light exit surface 844 at Γ °. In the illumination area The critical angle in the core-cladding interface of 84 is set to be equal to the critical angle Θ. ° of the core-cladding interface of the optical fiber optical plate 1. Therefore, even the illumination area 84 can be established in the aforementioned formula. (6) The relationship shown. That is, the following is derived (10). Nr 0… (10) However, the critical angle r ° in the air-core interface in the illumination area 84 is greater than the critical angle in the air-core interface of the optical fiber flat plate 1; 5 200303994 °. Therefore, the incident angle Γ ° toward the illumination light incident surface 844 of the local illumination light is formed to be smaller than the critical angle t ° in the air-core interface in the illumination area 84. The illumination light is such that The part in contact with the air in the illumination light exit surface 844 can also be emitted to the outside. Therefore, the illumination device can more efficiently illuminate the object to be measured. In the first to third embodiments described above, in the illumination area, Set the interval with the most cores (the interval on the central axis of the core) to be longer than the interval (the interval on the central axis of the cores) that is configured by most of the cores in the detection area. It is preferable that the core cross-sectional area is formed larger than the core cross-sectional area in the detection area. When used in multi-core optical fiber (MF) or multi-mode optical fiber (MMF) for the lighting area, the coating thickness of multi-core optical fiber (MF) or multi-mode optical fiber (MMF) used in the detection area When the thickness of the manufactured optical fiber is the same as that of the light absorber, the diameter of the core in the illumination area is set to be larger than the diameter of the core in the detection area, that is, in the illumination area. By increasing the relative arrangement of the cores, the area ratio of the cores in the incident surface of the illumination light can be increased, and the incidence of illumination light in the illumination area can be improved. On the one hand, by reducing the relative arrangement of the cores in the detection area, the number of cores per unit area on the bump input surface and bump output surface will increase, and the Accuracy of the bump pattern transmitted in the detection area. In the above-mentioned first to third embodiments, the LED array can also be mounted on the optical fiber optical flat plate, so that the illumination direction of the LED array is consistent with the direction of the light transmission path of the illumination area. Fig. 13 is a conceptual diagram showing a state in which the LED array 20A 200303994 is mounted on a fiber optic flat panel 10. The LED array 20 is arranged below the illumination light incident surface 042 so that the illumination direction is aligned with the direction of the light transmission path of the illumination area 104. Both the LED array 20 and the illumination light incident surface 1042 are joined with a transparent resin 30. The light receiving surface 40 is bonded to the concave-convex pattern output surface 1 024 of the detection area 102. By aligning the illumination direction of the LED array with the direction of the light transmission path of the illumination area, the incidence efficiency of the illumination area 54 toward the illumination light is improved. In the above-mentioned first to third embodiments, the refractive index of the core, the refractive index of the coating, the cross-sectional area perpendicular to the central axis of the core, and the position of the core may also be interposed between the illumination light incident surface and the LED array. At least one of the set intervals is a different other optical fiber optical plate (intermediate fiber optical plate). Fig. 14 is a schematic view showing the state where the LED array 60 holds the intermediate optical fiber flat plate 70 and is arranged below the illumination light incident surface 542. The intermediate optical fiber flat plate 70 is set to have the same deviation angle as that of the optical fiber flat plate 50. By adjusting the refractive index of the core and cladding constituting the intermediate fiber optical plate 70, the incidence efficiency of the illumination region 54 toward the illumination light can be improved. Furthermore, even between the concave-convex pattern output surface 524 and the light receiving surface 80, the intermediate fiber optical flat plate 70 can be sandwiched. Fig. 5 is a conceptual diagram showing a state where an intermediate optical fiber optical plate 70 is interposed between the LED array 60 and the light receiving surface 80 and the optical fiber optical plate 50. By adjusting the refractive index of the core and the cladding constituting the intermediate optical fiber flat plate 70, it is possible to increase the incidence efficiency toward the illumination area 5 4 of the illumination light and the output efficiency toward the light receiving surface 80 of the concave-convex pattern. In addition, as the lighting device, it is preferable to use a 200303994 type embedded LED array 9 which is thinner than the LED array 5. FIG. 16 is a front view of the embedded LED array 9. As shown in FIG. Fig. 17 is a cross-sectional view taken along the XIV-XIV line of the embedded LED array disclosed in Fig. 13; In the long-plate-shaped printed substrate 902, a plurality of insertion holes 906 are formed along the length direction of the printed substrate 902 so as to be embedded in the LED 904. The bottom panel 908 constituting the bottom surface of the insertion hole 906 is mounted on the printed circuit board 902 by soldering. The bottom panel 908 is provided with L E D 9 0 4 and is configured with a wire 9 10. By applying the LE D array 9, a thinner concave-convex pattern detection device can be manufactured. [Possibility of Industrial Utilization] The present invention is applicable to, for example, a fingerprint detector. [Brief description of the drawings] FIG. 1 is a plan view of a concave-convex pattern detection device 2 to which the optical fiber optical flat plate 1 is applied. Fig. 2 is a cross-sectional view taken along the line η_Π of the uneven pattern detection device 2 disclosed in Fig. 1. FIG. 3 is a cross-sectional view taken along line ηΐ_ΠI of the uneven pattern detection device 2 disclosed in FIG. 1. FIG. 4 is a front view of the LED array 5. Fig. 5 is a cross-sectional view of the LED array 5 shown in Fig. 4 taken along the line V-V. Fig. 6 is a front view of the fiber optic flat panel 1 shown in Fig. 1. Fig. 7 is a partially enlarged cross-sectional view of the fiber optic flat plate 1 in the detection area 12. -23- 200303994 Fig. 8 is a schematic diagram showing a state in which a finger 6 as an object to be measured is placed on the optical fiber optical plate 1. Fig. 9 is a schematic view showing the state in which the illumination light is emitted or reflected on the illumination light emitting surface 144. FIG. 10 is a schematic diagram showing the state of the detection light incident on the detection area 12 by the finger 6 and guided by the light transmission path of the detection area 12. FIG. Π is a schematic diagram showing the state in which the illumination light is emitted or reflected on the illumination light emitting surface 744. FIG. 12 is a schematic view showing the state in which the illumination light is emitted or reflected on the illumination light emitting surface 844. FIG. FIG. 13 is a conceptual diagram showing a state in which the LED array 20 is mounted on the optical fiber flat panel 10. FIG. 14 is a conceptual view of the LED array 60 sandwiching the intermediate optical fiber optical plate 70 and disposed below the illumination light incident surface 5 4 2. Fig. 15 is a conceptual view showing a state where an intermediate optical fiber optical plate 70 is interposed between the LED array 60 and the light receiving surface 80 and the optical fiber optical plate 50. FIG. 16 is a front view of the embedded LED array 9. Fig. 17 is a cross-sectional view taken along the XIV-XIV line of the embedded LED array disclosed in Fig. 13; [Description of Representative Symbols of Main Parts] 1: Fiber Optic Flat Panel 2: Bump Pattern Detection Device -24- 200303994 3: Frame 4: Photographic Element
5 : L E D 陣歹[J 6 :手指 7 :光纖光學平板 8 :光纖光學平板 9 :嵌入型LED陣列 1 〇 :光纖光學平板 1 2 :檢測區域 1 4 :照明區域 2 0 ： LED 陣歹!] 3 〇 :透明樹脂 3 2 :底面 34 :線纜端子 3 6 ·接合線 40 :受光面 42 :受光面 44 :外框 46 :線纜端子 5 〇 :光纖光學平板 54 :照明區域5: LED array [J 6: Finger 7: Fiber optic flat panel 8: Fiber optic flat panel 9: Embedded LED array 1 〇: Fiber optic flat panel 1 2: Detection area 1 4: Illumination area 2 0: LED array!] 3 〇: transparent resin 3 2: bottom surface 34: cable terminal 36 6 bonding wire 40: light receiving surface 42: light receiving surface 44: frame 46: cable terminal 5 〇: fiber optic flat plate 54: lighting area
60 ： LED 陣歹[J 70 :中間光纖光學平板 -25- 200303994 7 4 :照明區域 8 〇 :受光面 8 2 :檢測區域 8 4 :照明區域 104 :照明區域 122:凹凸圖型輸入面 124:凹凸圖型輸出面 1 4 2 :照明光射入面 144 :照明光射出面 1 6 0 ··核心 161 :包覆 162 :光吸收體 1 6 5 :端面 165b :端面 165a ：端面 5 02 :印刷基板 504 ： LED 506 :電阻器 5 1 0 :環氧系透明樹脂 524:凹凸圖型輸入面 542 :照明光射入面 744 :照明光射出面 844 :照明光射出面 200303994 902 :印刷基板 904 : LED 9 0 6 :嵌入孔 9 0 8 :底面板 9 1 0 :導線 1 042 :照明光射入面60: LED array [J 70: Intermediate fiber optic flat plate-25- 200303994 7 4: Illumination area 8 〇: Light receiving surface 8 2: Detection area 8 4: Illumination area 104: Illumination area 122: Bump pattern input surface 124: Bump pattern output surface 1 4 2: Illumination light entrance surface 144: Illumination light exit surface 1 6 0 ·· Core 161: Cover 162: Light absorber 1 6 5: End surface 165b: End surface 165a: End surface 5 02: Printing Substrate 504: LED 506: Resistor 5 1 0: Epoxy-based transparent resin 524: Bump-shaped input surface 542: Illumination light entrance surface 744: Illumination light exit surface 844: Illumination light exit surface 200303994 902: Printed substrate 904: LED 9 0 6: Insertion hole 9 0 8: Bottom panel 9 1 0: Wire 1 042: Illumination light incident surface