201145179 六、發明說明： 【發明所屬之技術領域】 本發明疋有關於-種取像系統，特別是指一種光學式 的取像系統。 【先前技術】 參閱圖！，為美國專利第7158659號所揭露的一種適用 於擷取指紋影像的成像裝置。成像裝置丨包含一 led模組 11、-第-稜鏡12、-光學組件13、_第二稜鏡14、一光 感測模組15及一耦合透鏡16〇第一稜鏡12與第二稜鏡14 對應設置，LED模組U設置於第一稜鏡12的一側且用以 提供光線，光學組件13設置於第一稜鏡12與第二棱鏡14 之間，光感測模組15設置於第二稜鏡14的下方，而耦合 透鏡16設於LED模組n與第一稜鏡12之間且用以將光線 導向第一稜鏡12。第一稜鏡12具有一傾斜的第一表面12〇 、一連接第一表面120且用以供一手指19放置的感測面 121 ’以及一與第一表面12〇相對的第二表面122。led模 組11所提供的光線會由第一表面120進入第一稜鏡12且朝 向感測面121，而光線會因感測面121上的手指19指紋反 射回第一表面120，並經反射後由第二表面122射出。所射 出的光再通過光學組件13與第二稜鏡14，而進入光感測模 組15以產生指紋影像。 然而，手指19的指紋具有紋峰（ridge)與紋谷（vaiiey)， 且指紋的紋峰與紋谷膚色相同且是不明顯的結構，但光感 測模組15是接收全部的反射光，以致於所產生的指紋影像 201145179 中之紋峰與紋谷的對比度不佳，將造成使用成像裝置^之 才曰紋衫像的成像系統在執行指紋辨識功能不易得到特徵點 ，即在執行指紋辨識功能的效果不佳。 有鑑於此，如何提供對比度佳的指紋影像，以供系統 執行指紋辨識功能或是手指導航功能，將是本案欲解決的 目標。 【發明内容】 因此本發明之目的，即在提供一種可擷取到較佳對 度的4a紋影像且將指紋影像進行應用於指紋辨識及手指 導航的小型化光學取像應用系統。 於疋本發明光學取像糸統，適於將一手指端影像進 行應用，該光學取像系統包含一光學取像裝置及一影像應 用裝置。光學取像裝置包括一反射結構、一光源組及一成 像單元。反射結構具有一供該手指端部分指紋接觸且至少 -邊寬度小於該手指端的長條形感測面、一與該感測面相 向的全反射面、一連接該感測面與該全反射面且與該全反 射面呈銳角的反射面，以及一與該反射面相向的出光面。 光源組與該反射結構對應設置且提供一照射該感測面的光 束，該光束的部分會被該感測面上的該手指端所散射，而 散射所形成的一散射光依序經該全反射面與該反射面並由 該出光面射出。成像單元具有一對應該出光面設置且供該 散射光穿透的成像透鏡及一對應該成像透鏡設置的影像感 、、·ί器該影像感測器藉該成像透鏡而掘取該散射光所形成 一該手指端部分指紋的影像^影像應用裝置連接該影像感 201145179 m 測器且接收該影像，並藉該影像進行應用。 另外’本發明的另一目的在於，提供另一種的光學取 像系統。 於疋，光學取像系統包含一光學取像裝置及一影像應 用農置。光學取像裝置包括一反射結構、—光源組及一成 像單元。反射結構具有一供該手指端部分指紋接觸且至少 邊寬度小於該手指端的長條形感測面、一連接該感測面 且與該感測面呈銳角的反射面，以及一與該反射面相向的 • 出光面。光源組與該反射結構對應設置且提供一照射該感 測面的光束，該光束的部分會被該感測面上的該手指端所 散射，而散射所形成的一散射光經該反射面後由該出光面 射出。成像單元具有一對應該出光面設置且供該散射光穿 透的成像透鏡及一對應該成像透鏡設置的影像感測器，該 影像感測器藉該成像透鏡而操取該散射光所形成一該手指 端部分指紋的影像。影像應用裝置連接該影像感測器且接 收該影像，並藉該影像進行應用。 _ 較佳地，當該手指端對該感測面滑動時，該影像感測 器操取多數個連續的影像；該影像應用裝置包括一進行一 才Β紋辨識模式的第一處理單元，該第一處理單元具有一將 該等連續的影像連接成一指紋圖案的接圖模組、一於該指 紋圖案找出至少一特徵點的特徵點建立模組及一將該特徵 點與一記憶模組内的其他指紋圖案進行比對以確認身分的 比對模組。 較佳地’當該手指端對該感測面上下左右移動時，該 201145179 影像感測器操取多數個連續的影像；該影像應用裝置包括 進行手私導航模式的第二處理單元，該第二處理單元藉 該等影像判斷出該手指端相對於該感測面的一相對位移量 ，該相對位移量可供控制_顯示螢幕的游標。 。較佳地’該感》則面界定出-第一感測區及一第二感測 區，邊第一感測區用於該指紋辨識模式，該第二感測區用 於該手指導航模式。 較佳地，該光源組具有一相鄰於該感測面側邊下方的 第一光源，以及一相鄰於該感測面另一側邊下方的第二光 源。 較佳地，該出光面為一負曲度的圓柱面，來調整影像 垂直和水平的變形量。但此面亦可為球面，非球面或者是 平面，再由處理程式或電路來校正其變形量。 較佳地，5亥成像單元還具有一設置於該出光面與該成 像透鏡之間的光圈。 本發明之功效在於，光學取像裝置藉由反射結構的設 計，使得成像單元的影像感測器僅接收到由指紋之紋峰部 分所傳回的散射光，所以影像感測器擷取到之影像的對比 度較佳。因此，後端進行指紋辨識模式與手指導航模式的 景夕像應用裝置具有良好的使用效果。另外，藉由反射結構 的設計，可使光學取像裝置達到小型化，故光學取像系統 確實能達成本發明之目的。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 201145179 以下配合參考圖式之個較佳實施例的詳細說明中，將可清 楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 參閱圖2’為本發明光學取像系統的第一較佳實施例。 光學取像系統2適用於裝設在一電子產品（圖未示），例如： 手機、筆記型電腦等，並進行指紋辨識功能與手指導航功 能。光學取像系統2包括一光學取像裝置3及一影像應用 裝置4 ’光學取像裝置3用於擷取到一手指端9之指紋的影 像，而影像應用裝置4連接光學取像裝置3，並藉由光學取 像裝置3所擷取的影像進行一指紋辨識模式及一手指導航 模式。 如圖2所示，光學取像裝置3包括一反射結構31、一 光源組32及一成像單元33。反射結構31具有一供手指端 9部分指紋接觸且至少一邊寬度小於手指端9的長條形感測 面311、一與感測面3丨丨相向的全反射面3丨2、—連接感測 面311與全反射面312且與全反射面312呈銳角的反射面 313，以及一與反射面313相向的出光面314，簡言之，感 測面311與全反射面312位於 二g从工， mi上 P方，而反射面313與出 光面314位於左、六方，6丄， 右万而全反射面312與反射面313所 夾的較佳角度範圍為65~75度之間。參閱圖3，感測面扣 具有-用於指紋辨識模式的第—感測區34及—用於手指導 航模式的第二感測區35 ’第一感測區34的寬度大於或等於 第—感測區3 5的寬度。 201145179 光源組32與反射結構31對應設置且提供一照射感測 面311的光束3(Π ’進一步說明，參閱圖2與圖3，光源組 32具有一相鄰於感測面3丨丨側邊下方的第一光源32卜以及 相鄰於感測面311另一側邊下方的第二光源322，也就是 第一光源321與第二光源322分別於反射結構31的兩侧， 在本實施例中，第一光源321與第二光源322為發光二極 體（LED)，或是第一光源321與第二光源322亦可由數顆 LED所組成，但不以此為限。成像單元33具有一對應出光 面314設置的成像透鏡331及一對應成像透鏡331設置的 影像感測器332，在本實施例中，影像感測器332可為一電 荷耦合元件（CCD)，亦可為一互補金屬氧化物半導體元件 (CMOS)，但不以此為限。較佳地，成像單元33還具有一設 置於出光面314與成像透鏡331之間的光圈333 ,以調整通 過光圈333的通光量，使得影像感測器332具有較佳地成 像品質。 接著，以光學取像裝置3中的光路徑來說明。又，手 指端9之指紋91具有紋峰部分911與紋谷部分912。如圖2 所不’光源組3 2 供光束3 01照射感測面311，而部分的 光束301會被感測面311上之指紋91的紋峰部分9Π所散 射’而散射所形成的一散射光302會於全反射面312進行 全反射，再經反射面313反射，最後由出光面314射出。 然後，射出的散射光302通過光圈333，並藉成像透鏡331 聚焦成像於影像感測器3 3 2，於是，影像感測器3 3 2藉成像 透鏡331而擷取散射光302所形成一手指端9部分指紋91 201145179 的影像。較佳地，出光面314為一負曲度的圓柱面，當然 ’亦可為負曲度的球面’並且影像感測器332所產生的影 像可藉電子產品内的軟體程式或硬體電路進行校正。 本實施例的影像感測器332所接收的散射光302 ,是由 指紋91的紋峰部分911所傳回來的，而光束3〇1照射到指 紋91的紋谷部分912所散射的散射光3〇3，則會在全反射 面312直接穿透到外部，而不會進入影像感測器332 ^如此 一來’使得影像感測器332僅接收到紋峰部分911所傳回來 的散射光302，藉此，由於影像感測器332所產生的影像僅 顯不紋峰部分911，故相較於習知具有較佳的對比度。再者 ，藉由成像透鏡331聚焦成像於影像感測器332，使得光學 取像裝置3相較於習知可減少其影像感測器332所需設置 的面積。另外，感測面311的尺寸是僅考慮手指端9的寬度 設計成長條形，使得光學取像裝置3整體為體積較小的結 構。 u 繼續參閱圖2，影像應用裝置4具有一進行指紋辨識模 式的第一處理單元41及一進行手指導航模式的第二處理單 疋42。並且先行說明，參閲圖4,使用者透過手指端9相 對於感測面311滑動，使得影像感測器332擷取到多數個連 續的影像。參閱圖5，第—處理單元41具有-將該等連續 的影像連接成一指紋圖案92的接圖模組411、一於指紋圖 案92找出指紋特徵點921的特徵點建立模組412及一將指 紋特徵點921與電子產品的__記憶模組（圖未示）内的其他指 紋圖案進行比對以確認身分的比對模組4丨3，在本實施例中 201145179 ，上述各模組是以軟體程式來實現，由電子產品的一中央 處理器（CPU)來進程運算4可由用—專用的指紋辨識處理 器進行運算’以提升效能。 在進行手指導航模式時，手指端相對於感測面上、下 、左、右滑動產生連續多數個影像，第二處理單元42能藉 該等連續影像判斷出手指端9相對於感測面311的一相對位 移量（Δχ，Ay)’於是，電子產品的中央處理器（cpu)可依據 該相對位移量控制電子產品的一顯示螢幕的游標，以進行 手才曰導航的功能。在本實施例中，第二處理單元42是以一 處理器（Processor)來實現。 此外，影像應用裝置4還包括一控制單元43，控制單 元5具有一連接影像感測器332的選取模組431及一連接 影像感測器332與光源組32的調整模組432，在本實施例 中，選取模組431與調整模組432是以電路來實現。 先說明在進行手指導航模式時，是不需擷取到整個指 紋91寬度的影像，所以在上述的感測面311定義出寬度較 小的第二感測區35來進行手指導航模式。更具體的說明， 參閱圖11，選取模組431可在影像應用裝置4進行指紋辨 識模式時，令影像感測器332選取其對應至感測面3ιι之第 一感測區34的第一光债測陣列（ph〇t〇 detect〇r _力_進 行成像，以使影像感測器332產生的影像是對應第一感測 區34上的減91。另一方面’選取模組431可在影像應用 裝置4進行手指導航模式時，令影像感測器332選取其對 應至感測面311之第二感測$ 35 @第二光谓測㈣謝進 10 201145179 行成像，以使影像感測器332產生的影像是對應第二感測 區35上的指紋91。須說明的是，基於原則是第一感測區 34的寬度大於或等於第二感測區35的寬度，第一光偵測陣 列801與第二光偵測陣列802亦可變換為其他態樣，如圖 12及圖13所示。調整模組432可依影像應用裝置4進行指 紋辨識模式或手指導航模式，來調整光源組32的亮度。 再來，以電子產品為手機來說明實際應用的情形，手 機開機時，内部軟體程式令光學取像系統2進行指紋辨識 # 模式，以確認使用者的身份後再執行開機。在開機後，内 部軟體程式令光學取像系統2進行手指導航模式，使用者 則可藉其手指端9相對於感測面311滑動，以控制手機之顯 示螢幕的游標。再者，若使用者藉手機上網且需在網路上 進行身份認證時，内部軟體程式會再令光學取像系統2進 行指紋辨識模式。整體來說，藉由光學取像系統2可將指 紋辨識功能與手指導航功能整合於電子產品（手機）上。 參閱圖6，為第一較佳實施例的另一態樣。其中的差異 • 在於，於成像透鏡331後設置一反射鏡93 ,以使散射光 302的光路徑轉折而往位於下方的影像感測器332，藉此縮 短光學取像裝置3的整體長度，並且同樣可以達到與第一 較佳實施例的功效。參閱圖7，為第一較佳實施例的又另一 態樣。其中的差異在於，上述的反射鏡93可置換為一稜鏡 94。再者’光源組32是設置於反射結構η的下方，以照 射反射結構31之感測面311。並且，同樣可以達到與第一 較佳實施例的功效。 11 201145179 參閱圖8, A本發明光學取像系統的第二較佳實施例。 光學取像线5包括—光學取縣置6及_影像應用裝置4 ，光學取繼6用於擷取到一手指端9之指紋的影像， 而影像應用裝置4連接料取像裝置6，並藉由光學取像裝 置6所掏取的影像進行一指紋辨識模式及一手指導航模式 。而第二較佳實施例與第一較佳實施例的差異在於光學取 像裝置6的反射結構，詳細說明如下。 f予取像裝置6包括一反射結構61、一光源組32及一 成像單元33。反射結構61具有-供手指# 9部分指紋9 j 接觸且至少-邊寬度小於手指端91的長條形感測面611、 一連接感測面611且與感測面611呈銳角的反射面612，以 及一與反射面612相向的出光面613。其中，感測面611與 反射面612所夾的較佳角度範圍為45〜5〇度之間。參閱圖9 ，感測面611具有一用於指紋辨識模式的第一感測區％及 用於手指導航模式的第二感測區35，第—感測區34的寬 度大於第二感測區35。 光源組32與成像單元33相同於第一較佳實施例光 源組32具有一相鄰於感測面611侧邊下方的第一光源321 ’以及一相鄰於感測面611另一側邊下方的第二光源322。 成像單元33具有一對應出光面613設置的成像透鏡331、 一對應成像透鏡331設置的影像感測器332 ,及一設置於出 光面613與成像透鏡331之間的光圈333。 接著，以光學取像裝置6中的光路徑來說明，光源組 32提供光束601照射感測面611，而部分的光束6〇1會被感 12 201145179 測面611上的指紋91的紋峰部分911所散射，而散射所形 成的一散射光602會於反射面612進行反射而由出光面613 射出。然後，散射光602通過光圈333，並藉成像透鏡331 聚焦成像於影像感測器332，於是，影像感測器332藉成像 透鏡331而擷取散射光302所形成一手指端9部分指紋91 的影像，並且紋谷部分912所形成的散射光（圖未示）同樣會 由反射結構61的底面穿透，因此，光學取像裝置6達到與 第一較佳實施例的功效。較佳地，出光面613為一負曲度 的圓柱面來調整影像垂直和水平的變形量。但此面亦可為 球面，非球面或者是平面，再由處理程式或電路來校正其 變形量。 並且，影像應用装置4藉由光學取像裝置6的所擷取 的影像進行指紋辨識模式與手指導航模式，而使光學取像 系統5達到與第一較佳實施之光學取像系統2例相同的功 效。 參閱圖10,為第二較佳實施例的另一態樣。其中的差 異在於，光源組32是設置於反射結構61的下方，以照射 反射、纟。構61之感測面61丨。並且，同樣可以達到與第一較 佳實施例的功效。 綜上所述，本較佳實施例的光學取像裝置3、6藉由反 射結構31、61的設計，使得成像單元33的影像感測器332 僅接收到由指紋91之紋峰部分911所傳回的散射光3〇2、 6〇2’所以影像感測器332操取到之影像的對比度較佳。因 此’後料行指_識料射料航料㈣像應用裝 13 201145179 置4具有良好的使用效果。另外，反射結構31、61的設計 ，還可使光學取像裝置3、6達到小型化，故光學取像系統 2、5確實能達成本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 忐以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一示意圖’說明習知的成像裝置及成像系統； 圖2是一側視示意圖，說明本發明光學取像系統的第 —較佳實施例； 圖3是一俯視示意圖，說明該光學取像系統的光學取 像裝置； 圖4是一示意圖，說明手指端對感測面滑動所擷取到 的連續影像； 圖5是一方塊圖，說明該光學取像系統之影像應用裝 置的第一處理單元； 圖6是一側視示意圖，說明第一較佳實施例的另—態 樣； 圖7是一側視示意圖，說明第一較佳實施例的又另— 態樣； 圖8是一側視示意圖，說明本發明光學取像系統的第 一較佳實施例； 圖9是一俯視示意圖，說明該光學取像系統的光學取 14 201145179 像裝置； 說明第二較佳實施例的另一態 圖1 〇是一側視示意圖 樣； 圖11是一示意圖，說明影像感測器的第一光感測陣列 與第二光感測陣列； 圖12是一示意圖，說明影像感測器的第一光感測陣列 與第二光感測陣列的另—態樣；及 圖13是一示意圖，說明影像感測器的第一光感測陣列 與第二光感測陣列的又另一態樣。201145179 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to an image taking system, and more particularly to an optical image taking system. [Prior Art] See the picture! An imaging device suitable for capturing fingerprint images is disclosed in U.S. Patent No. 7,158,659. The imaging device 丨 includes a LED module 11, a 第-稜鏡12, an optical component 13, a second 稜鏡14, a light sensing module 15, and a coupling lens 16, a first 稜鏡12 and a second The LED module U is disposed on one side of the first port 12 for providing light, and the optical component 13 is disposed between the first port 12 and the second prism 14. The light sensing module 15 is disposed. The coupling lens 16 is disposed between the LED module n and the first crucible 12 and is configured to guide the light to the first crucible 12 . The first weir 12 has a slanted first surface 12A, a sensing surface 121' that connects the first surface 120 for placement of a finger 19, and a second surface 122 that is opposite the first surface 12A. The light provided by the LED module 11 enters the first surface 12 from the first surface 120 and faces the sensing surface 121, and the light is reflected back to the first surface 120 by the fingerprint of the finger 19 on the sensing surface 121, and is reflected. It is then ejected by the second surface 122. The emitted light passes through the optical assembly 13 and the second turn 14, and enters the light sensing module 15 to produce a fingerprint image. However, the fingerprint of the finger 19 has a ridge and a vaiiey, and the peak of the fingerprint is the same as the texture of the grain and is not obvious, but the light sensing module 15 receives all the reflected light. Therefore, the contrast between the peaks and the valleys in the generated fingerprint image 201145179 is not good, which will cause the imaging system using the imaging device to perform the fingerprint recognition function, and the fingerprint is not easily obtained. The effect of the function is not good. In view of this, how to provide a fingerprint image with good contrast for the system to perform fingerprint recognition or finger navigation function will be the target of this case. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a miniaturized optical imaging application system that can capture a 4a image with a better contrast and apply fingerprint images to fingerprint recognition and finger navigation. The optical imaging system of the present invention is suitable for applying a finger-end image, the optical imaging system comprising an optical imaging device and an image application device. The optical imaging device includes a reflective structure, a light source set, and an imaging unit. The reflective structure has a long sensing surface for the finger end portion to be in fingerprint contact with at least a side width smaller than the finger end, a total reflection surface facing the sensing surface, and a connecting surface and the total reflection surface And a reflecting surface having an acute angle with the total reflection surface, and a light emitting surface facing the reflecting surface. The light source group is disposed corresponding to the reflective structure and provides a light beam that illuminates the sensing surface, a portion of the light beam is scattered by the finger end of the sensing surface, and a scattered light formed by the scattering sequentially passes through the whole The reflecting surface and the reflecting surface are emitted from the light emitting surface. The imaging unit has a pair of imaging lenses disposed on the illuminating surface for the scattered light to penetrate and a pair of imaging sensations to be disposed by the imaging lens, and the image sensor digs the scattered light by the imaging lens An image forming device that forms a fingerprint of the finger end portion is connected to the image sensing device 201145179 m and receives the image, and the image is applied by using the image. Further, another object of the present invention is to provide another optical imaging system. Yu Yu, the optical imaging system includes an optical imaging device and an image application farm. The optical imaging device includes a reflective structure, a light source set, and an imaging unit. The reflective structure has a long strip-shaped sensing surface for the finger end portion to be in fingerprint contact and at least a side width smaller than the finger end, a reflecting surface connecting the sensing surface and having an acute angle with the sensing surface, and a reflecting surface To the light side. The light source group is disposed corresponding to the reflective structure and provides a light beam that illuminates the sensing surface, a portion of the light beam is scattered by the finger end of the sensing surface, and a scattered light formed by the scattering passes through the reflective surface The light exiting surface is emitted. The imaging unit has a pair of imaging lenses disposed on the light-emitting surface for the scattered light and a pair of image sensors to be disposed by the imaging lens, and the image sensor uses the imaging lens to operate the scattered light to form a An image of the fingerprint of the finger end portion. The image application device is connected to the image sensor and receives the image, and the image is applied by the image. Preferably, when the finger end slides on the sensing surface, the image sensor operates a plurality of consecutive images; the image application device includes a first processing unit that performs a pattern recognition mode, The first processing unit has a connection module for connecting the consecutive images into a fingerprint pattern, a feature point building module for finding at least one feature point in the fingerprint pattern, and a feature point and a memory module The other fingerprint patterns in the comparison are compared to confirm the identity of the module. Preferably, the 201145179 image sensor operates a plurality of consecutive images when the finger end moves to the left and right of the sensing surface; the image application device includes a second processing unit that performs a palm-to-private navigation mode. The two processing units determine, by the images, a relative displacement of the finger end relative to the sensing surface, the relative displacement amount being available for controlling the cursor of the display screen. . Preferably, the sensation defines a first sensing area and a second sensing area, wherein the first sensing area is used for the fingerprint recognition mode, and the second sensing area is used for the finger navigation mode. . Preferably, the light source group has a first light source adjacent to a side of the sensing surface and a second light source adjacent to the other side of the sensing surface. Preferably, the light exiting surface is a cylindrical surface of negative curvature to adjust the vertical and horizontal deformation of the image. However, this surface can also be spherical, aspherical or flat, and the amount of deformation can be corrected by a processing program or circuit. Preferably, the 5 liter imaging unit further has an aperture disposed between the illuminating surface and the imaging lens. The effect of the invention is that the optical image capturing device is designed such that the image sensor of the imaging unit receives only the scattered light returned by the peak portion of the fingerprint, so the image sensor captures it. The contrast of the image is better. Therefore, the image recognition mode and the finger navigation mode of the back end have a good use effect. In addition, the optical imaging device can be miniaturized by the design of the reflective structure, so that the optical imaging system can achieve the object of the present invention. [Embodiment] The foregoing and other technical contents, features, and advantages of the present invention will be apparent from the following description of the preferred embodiments of the invention. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. Referring to Figure 2', a first preferred embodiment of the optical imaging system of the present invention is shown. The optical imaging system 2 is suitable for being installed in an electronic product (not shown), such as a mobile phone, a notebook computer, etc., and performs fingerprint recognition function and finger navigation function. The optical imaging system 2 includes an optical imaging device 3 and an image application device 4. The optical imaging device 3 is used to capture an image of a fingerprint of a finger end 9, and the image application device 4 is connected to the optical imaging device 3. A fingerprint recognition mode and a one-finger navigation mode are performed by the image captured by the optical imaging device 3. As shown in Fig. 2, the optical imaging device 3 includes a reflective structure 31, a light source group 32, and an imaging unit 33. The reflective structure 31 has a long-shaped sensing surface 311 for the finger end 9 to be in fingerprint contact with at least one side of the finger end 9 and a total reflection surface 311 2 opposite to the sensing surface 3 — 2 - connection sensing The surface 311 is opposite to the total reflection surface 312 and the reflection surface 313 at an acute angle to the total reflection surface 312, and a light exit surface 314 facing the reflection surface 313. In short, the sensing surface 311 and the total reflection surface 312 are located at two points. The mi is on the P side, and the reflective surface 313 and the light exit surface 314 are located on the left, hexagonal, and 6 丄, and the right angle of the total reflection surface 312 and the reflection surface 313 is between 65 and 75 degrees. Referring to FIG. 3, the sensing surface buckle has a first sensing area 34 for the fingerprint recognition mode and a second sensing area 35 for the finger navigation mode. The width of the first sensing area 34 is greater than or equal to the first The width of the sensing area 35. 201145179 The light source group 32 is disposed corresponding to the reflective structure 31 and provides a light beam 3 illuminating the sensing surface 311 (Π ' further, referring to FIG. 2 and FIG. 3, the light source group 32 has a side adjacent to the sensing surface 3丨丨The lower first light source 32 and the second light source 322 adjacent to the other side of the sensing surface 311, that is, the first light source 321 and the second light source 322 are respectively on opposite sides of the reflective structure 31, in this embodiment. The first light source 321 and the second light source 322 are light emitting diodes (LEDs), or the first light source 321 and the second light source 322 may be composed of a plurality of LEDs, but not limited thereto. The imaging unit 33 has An imaging lens 331 corresponding to the light-emitting surface 314 and an image sensor 332 disposed corresponding to the imaging lens 331. In this embodiment, the image sensor 332 can be a charge coupled device (CCD) or a complementary The metal oxide semiconductor device (CMOS), but not limited thereto. Preferably, the imaging unit 33 further has an aperture 333 disposed between the light-emitting surface 314 and the imaging lens 331 to adjust the amount of light passing through the aperture 333. Making image sensor 332 better imaged Next, the light path in the optical image capturing device 3 is explained. Further, the fingerprint 91 of the finger end 9 has a peak portion 911 and a valley portion 912. As shown in Fig. 2, the light source group 3 2 is provided for the light beam 3 01 The sensing surface 311 is illuminated, and a portion of the light beam 301 is scattered by the peak portion 9 of the fingerprint 91 on the sensing surface 311. A scattered light 302 formed by scattering is totally reflected on the total reflection surface 312, and then The reflective surface 313 is reflected and finally emitted by the light exiting surface 314. Then, the emitted scattered light 302 passes through the aperture 333 and is focused and imaged by the imaging lens 331 to the image sensor 3 3 2 , so that the image sensor 3 3 2 is imaged. The lens 331 captures the image of the fingerprint 9 of the finger end 9 and the image of the fingerprint 91 201145179. Preferably, the light exit surface 314 is a cylindrical surface with a negative curvature, and of course 'can also be a spherical surface of negative curvature' and image The image generated by the sensor 332 can be corrected by a software program or a hardware circuit in the electronic product. The scattered light 302 received by the image sensor 332 of the embodiment is transmitted by the peak portion 911 of the fingerprint 91. Come back, and the beam 3〇1 shines on the fingerprint 9 The scattered light 3〇3 scattered by the valley portion 912 of 1 will directly penetrate to the outside at the total reflection surface 312 without entering the image sensor 332. Thus, the image sensor 332 is only received. The scattered light 302 transmitted back to the peak portion 911, whereby the image generated by the image sensor 332 shows only the peak portion 911, so that it has better contrast than the conventional one. The imaging lens 331 is focused and imaged by the image sensor 332, so that the optical imaging device 3 can reduce the area required for the image sensor 332 to be set. Further, the size of the sensing surface 311 is a design strip shape considering only the width of the finger end 9, so that the optical image pickup device 3 as a whole has a small volume structure. Referring to Figure 2, the image application device 4 has a first processing unit 41 for performing a fingerprint recognition mode and a second processing unit 42 for performing a finger navigation mode. In the first description, referring to FIG. 4, the user slides through the finger end 9 relative to the sensing surface 311, so that the image sensor 332 captures a plurality of consecutive images. Referring to FIG. 5, the first processing unit 41 has a connection module 411 for connecting the consecutive images into a fingerprint pattern 92, a feature point establishing module 412 for finding the fingerprint feature point 921 in the fingerprint pattern 92, and a The fingerprint feature point 921 is compared with other fingerprint patterns in the __memory module (not shown) of the electronic product to confirm the identity comparison module 4丨3. In the present embodiment, 201145179, each of the above modules is Implemented in a software program, a central processing unit (CPU) of the electronic product processes 4 can be operated by a dedicated fingerprint recognition processor to improve performance. When the finger navigation mode is performed, the finger end is slid relative to the sensing surface, the left, the right, and the right to generate a continuous plurality of images, and the second processing unit 42 can determine the finger end 9 relative to the sensing surface 311 by using the continuous images. A relative displacement amount (Δχ, Ay)', then the central processing unit (CPU) of the electronic product can control the cursor of a display screen of the electronic product according to the relative displacement amount to perform the function of the hand navigation. In this embodiment, the second processing unit 42 is implemented as a processor. In addition, the image application device 4 further includes a control unit 43 having a selection module 431 connected to the image sensor 332 and an adjustment module 432 connecting the image sensor 332 and the light source group 32. In the example, the selection module 431 and the adjustment module 432 are implemented by circuits. First, when the finger navigation mode is performed, it is not necessary to capture the image of the entire width of the fingerprint 91. Therefore, the second sensing area 35 having a small width is defined on the sensing surface 311 described above to perform the finger navigation mode. For more specific description, referring to FIG. 11 , the selection module 431 can cause the image sensor 332 to select the first light corresponding to the first sensing region 34 of the sensing surface 3 ι when the image application device 4 performs the fingerprint recognition mode. The debt measurement array (image) performs imaging so that the image generated by the image sensor 332 corresponds to the subtraction 91 on the first sensing area 34. On the other hand, the selection module 431 can be When the image application device 4 performs the finger navigation mode, the image sensor 332 selects the second sensing $35 @second light pre-measurement (4) Xie Jin 10 201145179 line image corresponding to the sensing surface 311 to enable image sensing. The image generated by the device 332 is corresponding to the fingerprint 91 on the second sensing region 35. It should be noted that, based on the principle, the width of the first sensing region 34 is greater than or equal to the width of the second sensing region 35, the first optical detection The measurement array 801 and the second light detection array 802 can also be converted into other aspects, as shown in FIG. 12 and FIG. 13. The adjustment module 432 can adjust the light source according to the fingerprint application mode or the finger navigation mode of the image application device 4. The brightness of group 32. Again, the description of electronic products for mobile phones In the case of the application, when the mobile phone is turned on, the internal software program causes the optical image capturing system 2 to perform the fingerprint identification # mode to confirm the identity of the user and then perform the booting. After the booting, the internal software program causes the optical image capturing system 2 to perform the finger. In the navigation mode, the user can slide the finger end 9 relative to the sensing surface 311 to control the cursor of the display screen of the mobile phone. Further, if the user borrows a mobile phone and needs to authenticate on the network, the internal software is used. The program will then perform the fingerprint recognition mode of the optical imaging system 2. In general, the optical recognition system 2 can integrate the fingerprint recognition function and the finger navigation function on the electronic product (mobile phone). Another aspect of the preferred embodiment is that a mirror 93 is disposed behind the imaging lens 331 to deflect the optical path of the scattered light 302 to the image sensor 332 located below, thereby shortening The overall length of the optical imaging device 3 can also achieve the same effect as the first preferred embodiment. Referring to Figure 7, there is still another aspect of the first preferred embodiment. The difference is that the mirror 93 can be replaced by a 稜鏡 94. Further, the 'light source group 32 is disposed under the reflective structure η to illuminate the sensing surface 311 of the reflective structure 31. The effect of the first preferred embodiment. 11 201145179 Referring to Figure 8, a second preferred embodiment of the optical imaging system of the present invention is provided. The optical imaging line 5 includes an optical pickup 6 and an image application device 4, optical The image capturing device 6 is connected to the image capturing device 6 and the image capturing device 6 performs a fingerprint recognition mode and a finger by the image captured by the optical image capturing device 6. The navigation mode is different from the first preferred embodiment in the reflection structure of the optical imaging device 6, which is described in detail below. The pre-fetching device 6 includes a reflecting structure 61, a light source group 32, and an image forming unit 33. The reflective structure 61 has a long-shaped sensing surface 611 for the finger 9 9 partial fingerprint 9 j contact and at least a side width smaller than the finger end 91, a reflective surface 612 connecting the sensing surface 611 and having an acute angle with the sensing surface 611 And a light-emitting surface 613 facing the reflecting surface 612. The preferred angle between the sensing surface 611 and the reflecting surface 612 ranges from 45 to 5 degrees. Referring to FIG. 9, the sensing surface 611 has a first sensing area % for the fingerprint recognition mode and a second sensing area 35 for the finger navigation mode. The width of the first sensing area 34 is greater than the second sensing area. 35. The light source group 32 is the same as the imaging unit 33. The light source group 32 of the first preferred embodiment has a first light source 321 ' adjacent to the side of the sensing surface 611 and a side adjacent to the other side of the sensing surface 611. The second light source 322. The imaging unit 33 has an imaging lens 331 disposed corresponding to the light emitting surface 613, an image sensor 332 disposed corresponding to the imaging lens 331, and an aperture 333 disposed between the light emitting surface 613 and the imaging lens 331. Next, with reference to the light path in the optical imaging device 6, the light source group 32 provides the light beam 601 to illuminate the sensing surface 611, and a portion of the light beam 6〇1 is sensed 12 201145179 The peak portion of the fingerprint 91 on the measuring surface 611 The 911 is scattered, and a scattered light 602 formed by the scattering is reflected by the reflecting surface 612 and emitted by the light emitting surface 613. Then, the scattered light 602 passes through the aperture 333 and is focused and imaged by the imaging lens 331 to the image sensor 332. Then, the image sensor 332 captures the scattered light 302 by the imaging lens 331 to form a finger end 9 partial fingerprint 91. The image, and the scattered light (not shown) formed by the valley portion 912 is also penetrated by the bottom surface of the reflective structure 61, and therefore, the optical imaging device 6 achieves the effects of the first preferred embodiment. Preferably, the light-emitting surface 613 is a cylindrical surface with a negative curvature to adjust the vertical and horizontal deformation of the image. However, this surface can also be spherical, aspherical or flat, and the amount of deformation can be corrected by a processing program or circuit. Moreover, the image application device 4 performs the fingerprint recognition mode and the finger navigation mode by using the captured image of the optical image capturing device 6, so that the optical imaging system 5 is the same as the optical imaging system 2 of the first preferred embodiment. The effect. Referring to Figure 10, another aspect of the second preferred embodiment is shown. The difference is that the light source group 32 is disposed below the reflective structure 61 to illuminate the reflections and ridges. The sensing surface 61 of the structure 61 is 61. Also, the efficacy with the first preferred embodiment can be achieved as well. In summary, the optical image capturing device 3, 6 of the preferred embodiment is designed such that the image sensor 332 of the imaging unit 33 receives only the peak portion 911 of the fingerprint 91 by the design of the reflective structures 31, 61. The transmitted scattered light 3〇2, 6〇2' is therefore better in contrast of the image captured by the image sensor 332. Therefore, the 'received line refers to the _received shot material (4) like the application equipment 13 201145179 set 4 has a good use effect. Further, the design of the reflecting structures 31, 61 can also miniaturize the optical image taking devices 3, 6, so that the optical image taking systems 2, 5 can achieve the object of the present invention. However, the above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view illustrating a conventional imaging device and imaging system; FIG. 2 is a side elevational view showing a first preferred embodiment of the optical imaging system of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a schematic view showing a continuous image captured by a finger end sliding on a sensing surface; FIG. 5 is a block diagram showing the optical imaging system. The first processing unit of the image application device; FIG. 6 is a side view showing another embodiment of the first preferred embodiment; FIG. 7 is a side view showing the other embodiment of the first preferred embodiment. Figure 8 is a side elevational view showing a first preferred embodiment of the optical imaging system of the present invention; Figure 9 is a top plan view showing the optical imaging system of the optical imaging system 14 201145179 image device; 1 is a schematic view of a side view; FIG. 11 is a schematic view showing a first light sensing array and a second light sensing array of the image sensor; FIG. 12 is a schematic view illustrating Image sensing Another aspect of the first light sensing array and the second light sensing array; and FIG. 13 is a schematic diagram illustrating the first light sensing array of the image sensor and the second light sensing array Aspect.
15 201145179 【主要元件符號說明】 2 ····. ••…光學取像系統 413… …比對模組 3 ·..·· ••…光學取像裝置 42…… …·第二處理單元 301 ·· ••…光束 43…… …控制單元 302 ·· ••…散射光 431 ··· •…選取模組 303 .. ••…散射光 432… …·調整模組 31··.· ••…反射結構 5 ....... •…光學取像系統 311 .. .....感測面 6 ....... •…光學取像裝置 312 .· .....全反射面 601… •…光束 313 .. ••…反射面 602… •…散射光 314 ·· .....出光面 61 •… •…反射結構 32·.·. .....光源組 611… •…感測面 321 ·· .....第 光源 612… •…反射面 322 ·· ••…第二光源 613… •…出光面 33···· ••…成像單元 801 ··· •…第一光偵測陣列 331 ·. ••…成像透鏡 802… •…第二光偵測陣列 332 ·· ••…影像感測器 9…… ----手4曰^ 333 ·· ••…光圈 91 ··... …·指紋 34···· ••…第一感測區 911… •…紋峰部分 35···· .....第二感測區 912 ... •…紋谷部分 4 ··.·· ••…影像應用裝置 92••… ----4a紋圖案 41·.·· ••…第一處理單元 921… •…特徵點 411 ·· ••…接圖模組 93·.··· •…反射鏡 412 .· …· ·特徵點建立模組 94····. ··..稜鏡15 201145179 [Description of main component symbols] 2 ·····••...Optical image capture system 413...Comparative module 3 ·····••...Optical image capture device 42.......Second processing unit 301 ·· ••...beam 43...control unit 302···•...scattered light 431 ····...selecting module 303 .. ••...scattering light 432... adjusting module 31··.· ••...Reflective structure 5 ....... •...Optical image capture system 311 .. . . .. Sensing surface 6 ....... •...Optical image capture device 312 .. ... .. Total reflection surface 601... •...beam 313 .. ••...reflecting surface 602... •...scattered light 314 ····.lighting surface 61 •... •...reflecting structure 32·.·. .... .Light source group 611... •...sensing surface 321 ····.light source 612...•...reflecting surface 322 ·· ••...second light source 613... •...light surface 33····••... imaging Unit 801 ····...The first light detecting array 331 ··•...Imaging lens 802...•...Second light detecting array 332 ··••...Image sensor 9... ----Hand 4曰^ 333 ·· ••...Aperture 91 ··. .. ... fingerprint 14···· ••...first sensing area 911... •...throat part 35····....second sensing area 912 ... •... grain portion 4 ····· ••...Image application device 92••... ----4a pattern 41····••...first processing unit 921... •...feature point 411 ·· ••... 93····· •...Mirror 412 .···· Feature Point Building Module 94····. ··..稜鏡
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