201214244 六、發明說明： 【發明所屬之技術領域】 本發明關於-種物件感測裝置，尤指一種可提供影像 均勻的光場強度之物件感測裝置。 【先前技術】 由於目前的消費性電子產品皆以輕、薄、短、小為設計之方向， 因此’產品上已無m容納如滑鼠、鍵盤、觸控料傳 具。隨著觸控裝置技術的進步，在各種消費性電子產品中，例如顯 示器、-體機(All in 〇ne)、行動電話、個人數位助理（&麵^ d獅 Assistant，PDA)等產品已廣泛地使用觸控裝置作為其資料輸入之 工具。此外’在觸控裝置日趨成熟之下，擁有大尺寸與多點觸控技 術的電子裝置將成絲來的域。目前，辟式觸控裝置相較其他 方式’如雜式、電容式、超音波式或郷影像式等，有更低成本 與更易達成的優勢。 請參閱第1圖，第1圖為先前技術的光學式觸控裝置i的示意 圖。如第1圖所示，光學式觸控裝置1包含-指示平面H)、-影像 感測單元12、-第一發光單元⑷、一第二發光單元⑽、一導光 板^以及—控制單元18。影像感測單元12設置於指示平面10的 角落第發光單το i4a與第二發光單元⑽分別設置於導光板 之兩端。第-發光單元⑷與影像感測單元㈣距—苐一距離 201214244 D1，第二發光單元14b與影像感測單元12相距-第二距離D2，且 第二距離D2大於第-距離m，如第i圖所示。換言之，第一發光 單元=較靠近影像_單元12，且第二發光單元⑽較遠離雜 感測早7G 12。控鮮元18電連接於影像_單元12、第—發光單 元14a以及第二發光單元14b。 於使用光學式觸控裝置10夺，控制單元18以相同的電流大小控 制第-發光單元14a以及第二發光單元⑽於相同的發光時間内同 時發光m發光單元14a與第二發光單元i4b發出的光線 分別從導光板16的兩端進人，並且經由導光板16導向指示平面 的方向。-當使用者湘-物件（例如，手指_控筆）於指示平面 1口〇上指示-位置時’物件將會遮蔽第一發光單幻4a以及第二發光 單7L 14b透過導光板16所發射的部分光線。接著，控制單元18控 制影像感測單元12感測關於指示平面10之側邊AB、AC之影像。 控制單it 18再根據影像感測單元12所感測到的影像資訊計算出物 件所指示的位置座標或其它物件資訊。 請參閱第2圖，第2圖為影像感測單元12感測之影像照度與指 示平面10之側邊AB、AC的關係圖。如果第一發光單元14a以及 第-發光單TL Mb的發糾間以及輸出功率（由輸人的電流大小決 定）都相同，則第一發光單元14a以及第二發光單元14b所產生的 光場強度也會相同。如第丨圖所示，由於第一發光單元14a以及第 一發光單元14b與影像感測單元12之間的距離不相同，如果第一發 201214244 光單元Ma以及第二發光單元Mb產生相同的光場強度，則會造成 影像感測單元12所感_的影賴度狗。如第2賴示，影像感 測單元！2感測到指示平面1()之側邊AB的影像照度，呈現出高低 落差極大的影像照度曲線’此不均勻㈣像照度會影輯感測到的 影像品質，使得感測準確度降低。 【發明内容】 因此，本發明的目的之-在於提供一種可提供影像感測單元均 勻的光場強度之物件感測裝置。 根據-實施例，本發明之物件感測裂置包含一指示平面、一第 -影像感測單發光單元、―第二發光料以及一控制單 疋。第-影像感測單元設置於指示平面之—第—側。第—發光單元 设置於指示平面之-第二侧且與第—影像感測單姑距一第一距 離，且第二側與第—術目對。第二發光單元設置於指科面之第二 側且與第-影像感測單元相距-第二距離，且第二距離大於第一距 2控制單it電連接於第-影像感測單元、第—發光單元以及第二 。_單元控㈣1像_單元於—第—曝光時間内感 不平面之一第―影像’控制第—發光單狀第—曝光時間 内發光以形成-第-光場強度，並且控制第二發光單狀第一曝光 =内發光㈣成-第二光频度，料二光顧度大光場 201214244 綜上所述，本發明之物件感測裝置利用第二發光單元（距離第 一影像感測單元較遠者）所形成的第二光場強度大於第一發光單元 (距離第㊉像❹彳單元較近者）所形成的第―光場強度，藉以提 供第-影像制單元均勻的觸強度。因此，第—影像感測單元所 ^測到的影像照度較為均勻，可確保第一影像感測單元所感測到的 影像品質，進而使物件感測的準確度有效提升。 關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式 得到進一步的瞭解。 【實施方式】 〇月多閱第3圖，第3圖為根據本發明一實施例之物件感測裝置 3的不意圖。如第3圖所示，物件感測裝置3包含_指示平面％、 一第-影像感測單元32a、-第一發光單元34a、一第二發光單元 34b、-導光;j：反36m及一控制單元％。於此實施例中，帛一影像感 測單元32a設置於指示平面3〇之一第一側S1之一角落。第一發光 單元34a、第一發光單元34b與導光板36皆設置於指示平面3〇之 第一側S2 ’且第二侧S2與第一側S1相對。第一發光單元％與 第二發光單元Mb分別設置於導光板36之二端，使得第一發光單元 3如與第二發光單元3扑發出的光線可分別從導光板％的兩端進 入，並且經由導光板36導向指示平面3〇的方向。 如第3圖所示’第-發光單元34a與第—影像感測單元瓜相 201214244 距-第-距離m，且第二發光單元灿與第一影像感測單元仏 相距-第二距離D2，其中第二距離D2大於第一距離以。換言之， 第-發光單it 34a較靠近第一影像感測單元瓜，且第二發光單元 34b較遠離第-影像感測單元瓜。控制單元％電連接於第一影 1 感測單元32a、第一發光單元34a以及第二發光單元3牝。〜 於實際應用時，第-影像感測單元仏可為電荷搞合元件 (Charge-coupled Device，CCD)感測器或互補式金屬氧化半導體 (Complementary Metal-〇xide Semic〇nduct〇r，CM〇s )感測器。第一 發光單元3如以及第二發光單元挪可分別為一發光二極體。需說 明的是，發光單元的數量可根據實際應用而決定，不以第3圖所繪 示的為限。控制單元38可為具有資料運算/處理功能的控制器/ 一般而言’物件感測裝置3 _還會設有運作時必要的軟硬體元 件’如顯示面板、中央處理單元（CentralPr〇cessingUnit，咖）' 讀體（memory)、儲存裝置（st〇ragedevice)、電源供應器、作業 系統等’視實際朗而心上述元件之功能為習知技藝之人可輕易 達成並加以運用，在此不再詳加贅述。 於使用物件感測裝置3時，控制單元38控制第一發光單元34a 與第二發光單元34b於-第-曝光時間内發i當使用者利用一物 牛（例士手才日或觸控筆）於指示平面30上指示一位置時，物件將 會遮蔽第一發光單元34a以及第二發光單元3处透過導光板36所發 201214244 射的部分光線。同時’控制單元38控制第一影像感測單元32a於此 第一曝光時間内感測關於指示平面3〇之側邊ab、AC之一第一影 像。控制單元38再根據第一影像感測單元32a所感測到的第一影像 資訊計算出物件所指示的位置座標或其它物體資訊。 於此實施例中，於第一曝光時間内，第一發光單元34a發出之 光線透過導光板36而形成一第一光場強度，第二發光單元3牝發出 之光線透料光板36而形成—第二光場強度，且第二光場強度大於 第一光場強度。換言之，於第一曝光時間内，第二發光單元34b (距 離第-影像制單元32a較遠者）所形成的第二光場強度大於第一 發光單元34a (距離第一影像感測單元32a較近者）所形成的第一 光場強度’故於第-曝光時間内，藉由適當地調整第—光場強度與 第二光場強度’即可針對第—影像感測單元32a提供—均勻的光場 強度’以使第-影像躺單元32a所制刺雜照雜為均勾。 請參閱第4圖，第4圖為第一影像感測單元办感測之影像照 度與指示平面30之側邊处、从的關係圖。如第4圖所示，藉由、 上述的方式適當地調整第—光場強度與第二光場強度，可使第一貪 像感測單元32a感測到指示平面3〇之側邊AB (亦即第二側％)之 影像照度呈現it}較為均㈣影像照度曲線，亦即第— 之 32a所感測到的影像照度較為均勻。 '、疋 請參閱第5圖，第5圖為根據本發明一實施例之曝光時間、輪 201214244 入電流與發光時間的關係圖。如第5圖所示，t〇_t3即為上述之第一 曝光時間。於第一曝光時間t〇_t3内，輸入一第一電流n予第一發 光單元34a’以使第一發光單元34a以一第一輸出功率發光；並^ 輸入-第二電流12予第二發光單元34b，以使第二發光單元3物以 一第二輸出功率發光。此外，於第一曝光時間t〇_t3内設定一第一發 ^時間to-tl以及一第二發光時間㈣。控制單元38控制第一發光 單元3如於第一發光時間_内發S，並且控制第二發光單元34b 於第二發光時間_内發光。於此實施例中，上述之第一光場強度 可由第-輸di功率鮮—發光時__tl決定，*上述 度可由第二輸出神與第二發糾間_蚊。 —先 舉例而言，第一光場強度可定義為第-輸出功率與第一發光時 :::乘:’而第二光場強度可定義為第二輸出功率與第二發光 二曰之乘積。換言之，藉由設定適當的第-輪出功率、第一發 光時間to-tl、第二輪出功率與第二發間似 時間t0-t3内，蚀货於 曝先 《第—發光單元34b所形成的第二光場強度大於第一 發先早疋34a所形成的第一光場強度。 請參閱第6圖，楚cm ^ _弟6圖為根據本發明另一實施例之曝光時間、 。如第6圖所示，翻@卩為上述之第 第-電流η光時間耗内，#輸人第—發光單元地的 第一發光單元34a之;'發光單元34b的第二電流12相同時（亦即 <弟一輪出功率等於第二發光單元34b之第二輸 201214244 -出功率），第二發光單元34b之第二發光時間t(M2f設定為大於第 一發光單元34a之第一發光時間抝七，以使第二發光單元3牝所產 生的第二光場強度大於第一發光單元地所產生的第一光場強度。 睛參閱第7圖’第7圖為根據本發明另一實施例之曝光時間、 輸入電流與發光時間的關係圖。如第7圖所示，㈣即為上述之第 -曝光時間。於第-曝光時間t(M2内，當第一發光單元3知之第一 發光時間ω-u與第二發光單元34b之第二發光時間制相同時， 輸入第二發光單元34b的第二電流12需設定為大於輸入第一發光單 元34a的第-電流n (亦即第二發光單元撕之第二輸出功率大於 第-發光單it 34a之第-輸出功率），以使第二發光單元灿所產生 的第二光場強度大於第-發光單元3如所產生的第一光場強度。 請參閱第8圖，第8圖為根據本發明另-實施例之物件感測裝 置3的不思圖。如第8圖以及第3圖所示，物件感測裝置3,以及物 •件感測裝置3的主要不同之處在於物件感測褒置3,更包含一第二影 像感測單元32b。第二影像感測單元奶電連接於控制單元38。第 二影像感測單元32b設置於指示平面3〇之第一侧81且相對於第一 影像❹彳單元32a。如第8圖所示，第一發光單元地與第二影像 感測單元32b相距-第三距離D3，且第二發光單元撕與第二影像 感測單元32b相距-第四距細，其中第三距_大於第四距離 D4一。換言，，第一發光單元較遠離第二影像感測單a奶，且 第二發光單元34b較靠近第二影像感測單元挪。第二影像感測單 201214244 70 32b之作用原理與上述之第一影像感測單元32a之作用原理大致-相同，故於此不再贅述。 、 於使用物件感測裝置3’時，控制單元38控制第一.發光單元地 與第二發光單元34b於-第-曝光時間内發光。當使用者利用一物 件（例如，手指或觸控筆）於指示平面3〇上指示一位置時，物件將 會遮蔽第-發光單元地以及第二發光單元撕透過導光板％所發 射的部分光線。同時’控制單元38控制第一影像感測單元32a於此 第-曝光時間内感測關於指示平S30之側邊ab、ac^h « 像。接著，控制單元38控制第-發光單元地與第二發光單元2 於-第二曝光時間内發光。此時，物件亦會遮蔽第一發光單元仏 以，第二發光單元34b透過導光板36所發射的部分光線。同時，控 制單元38控制第二影像感測單元32b於此第二曝光時間内感測關於 如平面30之側邊AB、BD之-第二影像。控制單元％再根據第 :影像感測單元32a所感測到的第一影像資訊及/或第二影像感測單 -所感測到的第一影像資訊計算出物件所指示的位置座標或其籲 它物件資訊。 ~ 需說明的是’關於第-影像感測單丨仏、第一發光單元3如 與第二發光單it 34b於第-曝光時間内的操作原理係如上所述，在 此不再贅述。以下僅就第二影像感測單元挪、第一·發光單元地 與第二發光單元34b於第二曝光時間内的操作原理做說明。 12 201214244 _ 於此實施射，於第二曝光時咖，第-贱單元34a發出之 光線透過導光板36而形成_第三光場強度，第二發光單元挪發出 之光線透過導光板36_成—第四級職，且第三光場強度大於 第四光場強度。換言之，於第二曝光時間内，第一發光單元地（距 離第二影像感測單元32b較遠者）所形成的第三光場強度大於第二 發光單元34b (距離第二影像感測單元32b較近者）所形成的第^ 光场強度’故於第二曝光時間内，藉由適當地調整第三光場強度與 籲第四光場強度’即可針對第二影像感測單元饥提供一均勾的光場 強度’以使第二影像感測單元32b所感測到的影像照度較為均句。 請參閱第9圖，第9圖為第二影像感測單元创感測之影像照 度與指示平面30之側邊AB、BD的關係圖。如第9圖所示，藉由 上述的方式適當地調整第三光場強度與第四光場強度，可使第二影 像感測單元32b感測到指示平面30之側邊AB (亦即第二側S2 ) 影像照度呈現出較為均勻的影像照度曲線，亦即第二影像感測單^ • 32b所感測到的影像照度較為均勻。 請參閱第10圖，第10圖為根據本發明另一實施例之曝光時間、 輸入電流與發光時間的關係圖。如第10圖所示，t4_t7即為上述之 第二曝光時間。於第二曝光時間t4-t7内，輸入一第一電流n，予第 -發光單元34a，以使第-發光單元34a以-第-輸出功率發光； 並且輸入一第二電流12'予第二發光單元34b’以使第二發光單元3处 以一第二輸出功率發光。此外，於第二曝光時間t4-t7内設定一第一 13 201214244 發光時間tlt6以及-第四發光時間似。控制單元％控制第一發 光單7G 34a於第三發光時間t4_t6内發光，並且控制第二發光單元 34b於第四發光時間抖#内發光。於此實施例中，上述之第三光場 強度可由第-輸出功率與第三發糾間㈣決定，第喊場強度= 由第二輸出功率與第四發光時間t4-t5決定。 舉例而言，第三光場強度可定義為第一輸出功率與第三發光時 間t4-t6之乘積’而第四賴強度可定義為第二輸出功率與第四發光 時間t4-t5之乘積。換言之，藉由設定適當的第—輸出功率、第三發 光夺間t4_t6、第一輸出功率與第四發光時間t4_t5，即可於第二曝光 時間糾則’使第一發光單元地所形成的第三光場強度大於第二 發光單元34b所形成的第四光場強度。 • »月參閱第11圖’第Π圖為根據本發明另—實施例之曝光時間、 輸入電流與發光時間的關係圖。如第n圖所示，t4_t7即為上述之 第-曝光時間。於第二曝光時間_内，當輸人第—發光單元W 的第電流II’與輸入第二發光單元Mb的第二電流D相同時（亦即 第一發光單元34a之第-輸出功率等於第二發光單元34b之第二輸 出功率)。’第-發光單元34a之第三發光時間⑽需設定為大於第 二發光單元34b之第四發光時間_，以使第一發光單元地所產 生的第三光場強度大於第二發光單元灿所產生的第四光場強度。 4參閱第12圖’第12圖為根據本發明另一實施例之曝光時間、 201214244 •輸人電流與發光時_關_。如第12 _示，⑽即為上述之 第二曝光時間。於第二曝光時間⑽内，當第一發光單元34a之第 三發光時間⑽與第二發光單元34b之第四發光時間⑽相同時， 輸入第-發光單元34a的第-電流u，需設定為大於輸入第二發光單 元34b的第二電流12，（亦即第一發光單元地之第一輸出功率大於 第二發光單it 34b之第二輸出功率），以使第一發光單元3如所產生 的第三光場強度大於第二發光單幻扑所產生的第四光場強度。 • 綜上所述，本發明之物件感測裝置可根據不同影像感測單元的 曝光時間，搭配不同位置的發光單元之光場強度大小，藉以提供個 別影像感測單元均勻的光場強度。因此，每一影像感測單元於對應 的曝光時間内所感測到的影像照度較為均勻，可確保每一影像感測 單元所感測到的影像品質，進而使物件感測的準確度有效提升。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍 鲁所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 【圖式簡單說明】 第1圖為先前技術的光學式觸控裝置的示意圖。 第2圖為影像感測單元感測之影像照度與指示平面之側邊的關 係圖。 第3圖為根據本發明一實施例之物件感測裝置的示意圖。 第4圖為第一影像感測單元感測之影像照度與指示平面之側邊 15 201214244 的關係圖。 · 第5圖為根據本發明一實施例之曝光時間、輸入電流與發光時 間的關係圖。 第6圖為根據本發明另一實施例之曝光時間、輸入電流與發光 時間的關係圖。 第7圖為根據本發明另一實施例之曝光時間、輸入電流與發光 時間的關係圖。 第8圖為根據本發明另一實施例之物件感測裝置的示意圖。 第9圖為第二影像感測單元感測之影像照度與指示平面之側邊 _ 的關係圖。 第10圖為根據本發明另一實施例之曝光時間、輸入電流與發光 時間的關係圖。 第11圖為根據本發明另一實施例之曝光時間、輸入電流與發光 時間的關係圖。 第12圖為根據本發明另一實施例之曝光時間、輸入電流與發光 時間的關係圖。 · 【主要元件符號說明】 3 ' 3, 物件感測裝置 12 影像感測單元 14b、34b第二發光單元 18、38 控制單元 1 光學式觸控裝置 10、30指示平面 14a、34a第一發光單元 16、36導光板 16 201214244 - 32a 第一影像感測單元 32b 第二影像感測單元 t0-t7 時間 11 ' 11' 第一電流 12、12' 第二電流 D1 第一距離 D2 第二距離 D3 第三距離 D4 第四距離 S1 第一側 S2 第二側 AB、 側邊201214244 VI. Description of the Invention: [Technical Field] The present invention relates to an object sensing device, and more particularly to an object sensing device that can provide a uniform light field intensity. [Prior Art] Since the current consumer electronic products are designed in a light, thin, short, and small direction, there is no such thing as a mouse, a keyboard, or a touch material. With the advancement of touch device technology, products such as monitors, all in 〇ne, mobile phones, personal digital assistants (& lions assistants, PDAs) have been used in various consumer electronic products. Touch devices are widely used as tools for their data input. In addition, as touch devices become more mature, electronic devices with large-size and multi-touch technologies will become a domain of silk. At present, the touch-sensitive devices have lower cost and easier advantages than other methods such as hybrid, capacitive, ultrasonic or 郷 image. Please refer to Fig. 1, which is a schematic view of a prior art optical touch device i. As shown in FIG. 1 , the optical touch device 1 includes an - indicating plane H), an image sensing unit 12, a first light emitting unit (4), a second light emitting unit (10), a light guide panel, and a control unit 18. . The image sensing unit 12 is disposed at a corner of the indicating plane 10, and the second light emitting unit το i4a and the second light emitting unit (10) are respectively disposed at both ends of the light guiding plate. The first light-emitting unit (4) and the image sensing unit (four) are spaced apart from each other by a distance of 201214244 D1, the second light-emitting unit 14b is spaced apart from the image sensing unit 12 by a second distance D2, and the second distance D2 is greater than the first-distance m, as described in Figure i shows. In other words, the first lighting unit = is closer to the image_unit 12, and the second lighting unit (10) is 7G 12 farther away from the noise. The control unit 18 is electrically connected to the image_unit 12, the first light-emitting unit 14a, and the second light-emitting unit 14b. Using the optical touch device 10, the control unit 18 controls the first light emitting unit 14a and the second light emitting unit (10) to simultaneously emit light from the light emitting unit 14a and the second light emitting unit i4b in the same lighting time with the same current magnitude. Light rays enter from the both ends of the light guide plate 16, respectively, and are guided to the direction of the indication plane via the light guide plate 16. - When the user Xiang-object (for example, finger_pen) indicates the position on the indication plane 1 port, the object will shield the first light-emitting single magic 4a and the second light-emitting single 7L 14b from being transmitted through the light guide plate 16. Part of the light. Next, the control unit 18 controls the image sensing unit 12 to sense an image about the sides AB, AC of the indication plane 10. The control unit 18 calculates the position coordinates or other object information indicated by the object according to the image information sensed by the image sensing unit 12. Referring to FIG. 2, FIG. 2 is a diagram showing the relationship between the image illuminance sensed by the image sensing unit 12 and the sides AB and AC of the indication plane 10. If the first light-emitting unit 14a and the first-light-emitting unit TL Mb are identically corrected and the output power (determined by the magnitude of the input current) is the same, the light field intensity generated by the first light-emitting unit 14a and the second light-emitting unit 14b It will be the same. As shown in the figure, since the distance between the first light emitting unit 14a and the first light emitting unit 14b and the image sensing unit 12 is different, if the first light 201214244 light unit Ma and the second light emitting unit Mb generate the same light The field strength will cause the image sensing unit 12 to sense the dog. As shown in the second, the image sensing unit! 2 The image illuminance indicating the side AB of the plane 1() is sensed, and the image illuminance curve showing the height difference is extremely large. This unevenness (4) illuminance will affect the image quality sensed by the image, so that the sensing accuracy is lowered. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an object sensing apparatus that provides uniform light field intensity of an image sensing unit. According to an embodiment, the object sensing split of the present invention comprises an indication plane, a first image sensing single illumination unit, a second illuminant, and a control unit. The first image sensing unit is disposed on the first side of the indication plane. The first light-emitting unit is disposed on the second side of the indication plane and is at a first distance from the first image sensing single-pitch, and the second side is opposite to the first-first eye. The second light emitting unit is disposed on the second side of the finger plane and is spaced apart from the first image sensing unit by a second distance, and the second distance is greater than the first distance 2 control unit is electrically connected to the first image sensing unit, - a lighting unit and a second. _ unit control (4) 1 image _ unit in the - first exposure time one of the planes - the image 'controls the first - the illuminating single shape - the exposure time illuminates to form the - first light field intensity, and control the second light single First exposure=internal illumination (four)-second optical frequency, material two-opportunity large light field 201214244 In summary, the object sensing device of the present invention utilizes a second illumination unit (distance from the first image sensing unit) The second light field intensity formed by the far side is greater than the first light field intensity formed by the first light emitting unit (closer to the tenth image unit), thereby providing a uniform touch intensity of the first image forming unit. Therefore, the image illuminance measured by the first image sensing unit is relatively uniform, which ensures the image quality sensed by the first image sensing unit, thereby effectively improving the accuracy of the object sensing. The advantages and spirit of the present invention will be further understood from the following detailed description of the invention. [Embodiment] FIG. 3 is a more detailed view of the article sensing device 3 according to an embodiment of the present invention. As shown in FIG. 3, the object sensing device 3 includes an _ indicating plane %, a first image sensing unit 32a, a first light emitting unit 34a, a second light emitting unit 34b, and a light guide; j: a reverse 36m and One control unit %. In this embodiment, the first image sensing unit 32a is disposed at a corner of one of the first sides S1 of the indication plane 3〇. The first light-emitting unit 34a, the first light-emitting unit 34b, and the light guide plate 36 are both disposed on the first side S2' of the indication plane 3'' and the second side S2 is opposed to the first side S1. The first light emitting unit % and the second light emitting unit Mb are respectively disposed at two ends of the light guide plate 36, so that the light emitted by the first light emitting unit 3 and the second light emitting unit 3 can enter from both ends of the light guide plate %, respectively, and The direction of the indication plane 3〇 is guided via the light guide plate 36. As shown in FIG. 3, the first light emitting unit 34a and the first image sensing unit are at a distance of -14 from the first image sensing unit, and the second light emitting unit is spaced apart from the first image sensing unit by a second distance D2. Wherein the second distance D2 is greater than the first distance. In other words, the first illumination unit 34a is closer to the first image sensing unit, and the second illumination unit 34b is further away from the first image sensing unit. The control unit % is electrically connected to the first shadow 1 sensing unit 32a, the first light emitting unit 34a, and the second light emitting unit 3A. ~ In practical applications, the first image sensing unit can be a charge-coupled device (CCD) sensor or a complementary metal oxide semiconductor (Complementary Metal-〇xide Semic〇nduct〇r, CM〇) s) sensor. The first light-emitting unit 3 and the second light-emitting unit are respectively a light-emitting diode. It should be noted that the number of light-emitting units can be determined according to the actual application, and is not limited to those shown in FIG. The control unit 38 can be a controller with data calculation/processing functions. In general, the 'object sensing device 3 _ will also have soft and hard components necessary for operation, such as a display panel, a central processing unit (CentralPr〇cessingUnit,咖) 'memory, storage device (st〇ragedevice), power supply, operating system, etc. 'Depending on the actual situation, the function of the above components can be easily achieved and used by people with know-how. I will repeat the details. When the object sensing device 3 is used, the control unit 38 controls the first light emitting unit 34a and the second light emitting unit 34b to send a mouse during the -first exposure time. When a position is indicated on the indication plane 30, the object will block a portion of the light emitted by the first light-emitting unit 34a and the second light-emitting unit 3 through the light guide plate 36 from 201214244. At the same time, the control unit 38 controls the first image sensing unit 32a to sense one of the first images of the sides ab, AC of the pointing plane 3〇 during the first exposure time. The control unit 38 calculates the position coordinates or other object information indicated by the object according to the first image information sensed by the first image sensing unit 32a. In this embodiment, during the first exposure time, the light emitted by the first light-emitting unit 34a passes through the light guide plate 36 to form a first light field intensity, and the light emitted by the second light-emitting unit 3 is formed by the light-transmitting light plate 36. The second light field intensity, and the second light field intensity is greater than the first light field intensity. In other words, during the first exposure time, the second light-emitting unit 34b (which is farther from the first image-forming unit 32a) has a second light field intensity greater than the first light-emitting unit 34a (from the first image sensing unit 32a). The first light field intensity formed by the present invention can be uniformly supplied to the first image sensing unit 32a by appropriately adjusting the first light field intensity and the second light field intensity during the first exposure time. The intensity of the light field is such that the puncturing of the first image lying unit 32a is uniform. Please refer to FIG. 4, which is a diagram showing the relationship between the image illuminance sensed by the first image sensing unit and the side of the indication plane 30. As shown in FIG. 4, by appropriately adjusting the first light field intensity and the second light field intensity in the manner described above, the first image sensing unit 32a can sense the side AB of the indication plane 3 ( That is, the image illuminance of the second side %) exhibits a more uniform (four) image illuminance curve, that is, the image illuminance sensed by the first 32a is relatively uniform. Referring to Fig. 5, Fig. 5 is a graph showing the relationship between the exposure time, the current of the round 201214244, and the illuminating time according to an embodiment of the present invention. As shown in Fig. 5, t〇_t3 is the first exposure time described above. During the first exposure time t〇_t3, a first current n is input to the first light emitting unit 34a' to cause the first light emitting unit 34a to emit light at a first output power; and the input - the second current 12 is second. The light emitting unit 34b is configured to cause the second light emitting unit 3 to emit light at a second output power. In addition, a first transmission time to-tl and a second illumination time (four) are set in the first exposure time t〇_t3. The control unit 38 controls the first lighting unit 3 to emit S as in the first lighting time_in, and controls the second lighting unit 34b to emit light in the second lighting time_. In this embodiment, the first light field intensity may be determined by the first-to-di power dimming-light-emitting time __tl, and the above-mentioned degree may be determined by the second output god and the second hair-swinging mosquito. For example, the first light field intensity can be defined as the first-output power and the first light-emitting time:::multiplication: 'and the second light field intensity can be defined as the product of the second output power and the second light-emitting luminance . In other words, by setting the appropriate first-round power, the first lighting time to-tl, the second round-out power, and the second inter-round time t0-t3, the eclipse is exposed to the first "light-emitting unit 34b" The intensity of the second light field formed is greater than the intensity of the first light field formed by the first early break 34a. Referring to FIG. 6, a view of the exposure time, according to another embodiment of the present invention, is shown in FIG. As shown in FIG. 6, the 卩@卩 is the first-current η light time consumption of the above, the first light-emitting unit 34a of the first-light-emitting unit is input; and the second current 12 of the light-emitting unit 34b is the same. (ie, <different round output power is equal to the second transmission 201214244 - output power of the second illumination unit 34b), and the second illumination time t of the second illumination unit 34b (M2f is set to be greater than the first illumination of the first illumination unit 34a) Time 拗7, such that the intensity of the second light field generated by the second light emitting unit 3牝 is greater than the intensity of the first light field generated by the first light emitting unit. See FIG. 7 'FIG. 7 is another according to the present invention. The relationship between the exposure time, the input current and the illuminating time of the embodiment. As shown in Fig. 7, (4) is the above-mentioned first exposure time. In the first exposure time t (M2, when the first illuminating unit 3 knows the first When the illuminating time ω-u is the same as the second illuminating time of the second illuminating unit 34b, the second current 12 input to the second illuminating unit 34b is set to be larger than the first current n input to the first illuminating unit 34a (ie, The second output power of the second illumination unit is greater than the first illumination unit. The first-output power of a is such that the intensity of the second light field generated by the second light-emitting unit is greater than the intensity of the first light field generated by the first light-emitting unit 3. See Figure 8, Figure 8 is based on The object sensing device 3 of the other embodiment of the present invention is not considered. As shown in Figs. 8 and 3, the main difference between the object sensing device 3 and the object sensing device 3 is the sense of the object. The measuring device 3 further includes a second image sensing unit 32b. The second image sensing unit is electrically connected to the control unit 38. The second image sensing unit 32b is disposed on the first side 81 of the indicating plane 3〇 and is opposite In the first image capturing unit 32a, as shown in FIG. 8, the first light emitting unit is spaced apart from the second image sensing unit 32b by a third distance D3, and the second light emitting unit is torn and the second image sensing unit 32b The distance-fourth distance is thin, wherein the third distance _ is greater than the fourth distance D4. In other words, the first lighting unit is farther away from the second image sensing unit a milk, and the second lighting unit 34b is closer to the second image sensing unit. The unit image is moved. The second image sensing sheet 201214244 70 32b works with the first image described above. The principle of operation of the measuring unit 32a is substantially the same, and therefore will not be described herein. When the object sensing device 3' is used, the control unit 38 controls the first. light emitting unit and the second light emitting unit 34b at the -first exposure time. Internal illumination. When the user indicates a position on the indication plane 3 by an object (for example, a finger or a stylus), the object will cover the first-light-emitting unit and the second illumination unit is torn through the light-guide plate%. At the same time, the control unit 38 controls the first image sensing unit 32a to sense the sides ab, ac^h « images of the indicating flat S30 during the first exposure time. Then, the control unit 38 controls the first light. The unit and the second lighting unit 2 emit light during the second exposure time. At this time, the object also shields the first light emitting unit 仏, and the second light emitting unit 34b transmits a part of the light emitted by the light guide plate 36. At the same time, the control unit 38 controls the second image sensing unit 32b to sense a second image about the sides AB, BD of the plane 30 during the second exposure time. The control unit % calculates the position coordinate indicated by the object or the call it according to the first image information sensed by the image sensing unit 32a and/or the first image sensing information sensed by the second image sensing unit 32a. Object information. It should be noted that the operation principle of the first image sensing unit, the first light emitting unit 3 and the second light emitting unit 3b in the first exposure time is as described above, and will not be described again. Hereinafter, only the operation principle of the second image sensing unit, the first light emitting unit and the second light emitting unit 34b in the second exposure time will be described. 12 201214244 _ In this case, at the second exposure, the light emitted by the first-inch unit 34a passes through the light guide plate 36 to form a third light field intensity, and the light emitted by the second light-emitting unit passes through the light guide plate 36_ - The fourth level, and the third light field intensity is greater than the fourth light field intensity. In other words, in the second exposure time, the third light field intensity formed by the first light emitting unit (farther from the second image sensing unit 32b) is greater than the second light emitting unit 34b (distance from the second image sensing unit 32b) The closer the light field intensity formed by the second image sensing unit can be provided for the second image sensing unit by appropriately adjusting the third light field intensity and the fourth light field intensity during the second exposure time. The intensity of the light field of each hook is such that the image illuminance sensed by the second image sensing unit 32b is more uniform. Please refer to FIG. 9. FIG. 9 is a diagram showing the relationship between the image illuminance of the second image sensing unit and the side AB and BD of the indication plane 30. As shown in FIG. 9, by appropriately adjusting the third light field intensity and the fourth light field intensity by the above manner, the second image sensing unit 32b can sense the side AB of the indication plane 30 (ie, the first The two sides of the S2) image illuminance show a more uniform image illuminance curve, that is, the image sensation sensed by the second image sensing unit ^ 32b is relatively uniform. Referring to FIG. 10, FIG. 10 is a graph showing exposure time, input current, and luminescence time according to another embodiment of the present invention. As shown in Fig. 10, t4_t7 is the second exposure time described above. During the second exposure time t4-t7, a first current n is input to the first-light-emitting unit 34a to cause the first-light-emitting unit 34a to emit light at the -first output power; and a second current 12' is input to the second The light emitting unit 34b' causes the second light emitting unit 3 to emit light at a second output power. Further, a first 13 201214244 lighting time tlt6 and a fourth lighting time are set in the second exposure time t4-t7. The control unit % controls the first light emitting sheet 7G 34a to emit light in the third lighting time t4_t6, and controls the second lighting unit 34b to emit light in the fourth lighting time jitter #. In this embodiment, the third light field intensity may be determined by the first output power and the third round error (4), and the second field strength = determined by the second output power and the fourth lighting time t4-t5. For example, the third light field intensity can be defined as the product of the first output power and the third lighting time t4-t6 and the fourth intensity can be defined as the product of the second output power and the fourth lighting time t4-t5. In other words, by setting an appropriate first-output power, a third illumination interval t4_t6, a first output power, and a fourth illumination time t4_t5, the second exposure time can be corrected to make the first light-emitting unit The three light field intensity is greater than the fourth light field intensity formed by the second light emitting unit 34b. • The month is referred to in Fig. 11. The figure is a graph showing the relationship between exposure time, input current and luminescence time according to another embodiment of the present invention. As shown in the nth figure, t4_t7 is the above-mentioned exposure time. In the second exposure time_, when the first current II' of the input first light-emitting unit W is the same as the second current D input to the second light-emitting unit Mb (that is, the first output power of the first light-emitting unit 34a is equal to the first The second output power of the two light emitting units 34b). The third illumination time (10) of the first illumination unit 34a is set to be greater than the fourth illumination time_ of the second illumination unit 34b such that the third illumination field generated by the first illumination unit is greater than the second illumination unit. The resulting fourth light field intensity. 4See Fig. 12' Fig. 12 is an exposure time according to another embodiment of the present invention, 201214244 • Input current and illuminating_off_. As shown in Fig. 12, (10) is the second exposure time described above. During the second exposure time (10), when the third illumination time (10) of the first illumination unit 34a is the same as the fourth illumination time (10) of the second illumination unit 34b, the first current u input to the first illumination unit 34a needs to be set to Larger than the second current 12 input to the second light emitting unit 34b (that is, the first output power of the first light emitting unit is greater than the second output power of the second light emitting unit it 34b), so that the first light emitting unit 3 is generated. The third light field intensity is greater than the fourth light field intensity produced by the second illuminating single illusion. In summary, the object sensing device of the present invention can provide uniform light field intensity of individual image sensing units according to the exposure time of different image sensing units and the intensity of the light field of the light emitting units at different positions. Therefore, the image illumination sensed by each image sensing unit during the corresponding exposure time is relatively uniform, which ensures the image quality sensed by each image sensing unit, thereby effectively improving the accuracy of the object sensing. The above is only the preferred embodiment of the present invention, and all changes and modifications made to the patent scope of the present invention are intended to be within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a prior art optical touch device. Figure 2 is a diagram showing the relationship between the image illumination sensed by the image sensing unit and the side of the indication plane. 3 is a schematic view of an object sensing device according to an embodiment of the present invention. Figure 4 is a diagram showing the relationship between the image illuminance sensed by the first image sensing unit and the side of the indication plane 15 201214244. Fig. 5 is a graph showing relationship between exposure time, input current, and lighting time according to an embodiment of the present invention. Fig. 6 is a graph showing exposure time, input current, and illuminating time according to another embodiment of the present invention. Fig. 7 is a graph showing exposure time, input current, and illuminating time according to another embodiment of the present invention. Figure 8 is a schematic view of an object sensing device in accordance with another embodiment of the present invention. Figure 9 is a diagram showing the relationship between the image illuminance sensed by the second image sensing unit and the side _ of the indication plane. Figure 10 is a graph showing exposure time, input current, and illumination time in accordance with another embodiment of the present invention. Figure 11 is a graph showing exposure time, input current, and illuminating time according to another embodiment of the present invention. Figure 12 is a graph showing exposure time, input current, and luminescence time according to another embodiment of the present invention. · [Main component symbol description] 3 ' 3, object sensing device 12 image sensing unit 14b, 34b second lighting unit 18, 38 control unit 1 optical touch device 10, 30 indicating plane 14a, 34a first lighting unit 16, 36 light guide plate 16 201214244 - 32a first image sensing unit 32b second image sensing unit t0-t7 time 11 '11' first current 12, 12' second current D1 first distance D2 second distance D3 Three distances D4 Fourth distance S1 First side S2 Second side AB, Side
AC、BDAC, BD