201201078 » f i ννυι j^r/v 六、發明說明： 【發明所屬之技術領域】 於有關於一種光學式觸控面板，且特別是有關 於-種賴訪祕社光學搞控面板。 【先前技術】 螢幕幕的操作❹便且富直覺性，因此，觸控 =係，地應用在各種電子裝置中，例如是手持式電子 、㈣理；電腦或提款機。目前，觸控螢幕係可根據感 S原理區分為電阻式、電容式、超音波式及光學式觸控螢 =光學式觸控螢幕來說，絲式觸控螢幕係包括基 =、感測器及觸控區。-般來說，光源、感測器及 工：白位，基板之上方，且光源及感測器係位於觸控區 。虽例如疋使用者之手指或者是觸控筆之物體位在觸控 :内日’ ％源所發出的部份的光線係被物體遮擔。如此一 來，根據感測器所接收到的影像，物體位在觸控區 控位置係可判斷出來。 然而，由於感測器係位於觸控區旁，因此，當物體太 3近感測器時，物體可能大量地反射光線至感測器，使 二在觸控位置的判斷上容易產生錯誤。另外，為了提高感 m=測範圍’感測器的視角往往需要增加，使得感測201201078 » f i ννυι j^r/v VI. Description of the invention: [Technical field of the invention] There is an optical touch panel, and in particular, relating to the optical control panel of the company. [Prior Art] The operation of the screen is simple and intuitive. Therefore, the touch system is applied to various electronic devices, such as handheld electronic devices, (four) devices, computers or cash machines. At present, the touch screen system can be divided into resistive, capacitive, ultrasonic and optical touch fluorescent light=optical touch screen according to the principle of S, the silk touch screen includes base=, sensor And the touch area. Generally speaking, the light source, the sensor and the work are: white, above the substrate, and the light source and the sensor are located in the touch area. For example, the user's finger or the object of the stylus is in the touch: the light emitted by the inner day'% source is covered by the object. In this way, according to the image received by the sensor, the object position can be judged at the touch control position. However, since the sensor is located beside the touch area, when the object is too close to the sensor, the object may reflect a large amount of light to the sensor, so that the judgment of the touch position is prone to error. In addition, in order to improve the sense of m=measurement range, the angle of view of the sensor often needs to be increased, so that the sensing
器所接收到的影像可能產；^你;W 此屋生變形，而影響判斷觸控位置的 二又，口此如何提供-種可增加判斷觸控位置之準確 又的光子式觸控螢幕，乃為相關業者努力之課題之一。 201201078 ., 【發明内容】 本發明主要係提供一種光學式觸控面板，其透過光感 測器及光轉向件之配置來提高增加判斷觸控位置之準確 度。由於光感測器位於基板之下方，且觸控區係位於基板 之上方，因此，光感測器因物體過近而大量地反光的情況 可避免，以增加判斷觸控位置的準確度。再者，透過光轉 向件之配置，光感測器之視角可縮小，以避免影像產生變 形而影響判斷觸控位置的準確度。 根據本發明，提出一種光學式觸控面板，包括一基 板、三個光學件、一光轉向件及兩個光感測器。此三個光 學件配置於基板之上方，且相互鄰接。此三個光學件設置 於基板的邊緣。光轉向件配置於基板之一側，光轉向件與 此三個光學件之間係形成一觸控區於基板的上方。此兩個 光感測器配置於基板之下方，分別位於基板之一側的相對 兩端處，且相對於光轉向件設置。此兩個光感測器透過光 轉向件擷取觸控區之影像。 根據本發明，再提出一種光學式觸控面板，包括一基 板、三個光源模組、一光轉向件及兩個光感測器。基板形 成一觸控區。此三個光源模組配置於基板之上方，且設置 於基板的邊緣。光轉向件配置於基板之一側邊’光轉向件 與此三個光源模組實質包圍基板。此兩個光感測器配置於 基板之下方，分別位於基板之相對兩端處，且相對於光轉 向件設置。此兩個光感測器只透過光轉向件擷取觸控區之 影像。 4 201201078 • r I VVU i 1/.ΓΛ 為讓本發明之上述内容能更明顯易懂，下文特舉較佳 實施例，並配合所附圖式，作詳細說明如下： 【實施方式】 第一實施例 請參照PA圖及第_，第1A_示根據本發明 第一實施例之光學式觸控面板之上視圖，且第ΐβ圖繪示 第1Α圖中之光學式觸控面板之側視圖。光學式觸控面板 • 1〇0包括一基板110、三個光學件120、一光轉向件13〇及 兩個光模組14 0。 本實施例之三個光學件12〇例如是三個回射哭 (Retr〇reflector)’配置於基板11〇之上方，且相互鄰 接。此三個光學件120設置於基板11〇的邊緣。光轉向件 130配置於基板丨10之一側。光轉向件13〇與此些光學件 120之間係形成一觸控區S1於基板11〇的上方。 此兩個光模組140各包括一光源141及一光感 • U2，且配置於基板110之下方。更詳細地說，此兩個光 感測器142分別位於基板110之另一侧的㈣兩端處，且 相對於光轉向件130設置。此外，兩個光源141分別配置 於鄰近兩個光感測器丨42處，且將光線導入觸控區S1。此 兩個光感測器142係透過光轉向件130擷取觸控區S1之 影像。 也就是說’當兩個光源141係在基板11〇的下方產生 光線時，光轉向件130係反射光線至光學件（回射器）12〇。 接著，光學件（回射器）120係回射光線至光轉向件13〇， 201201078 I ” vr i in r~v , , 使光感測器142經由光轉向件13〇接收到光線。由於觸控 區S1係位於基板11〇之上方，且光感測器142係位於基 板110之下方，因此，相較於以往觸控區及感測器皆配置 於基板之上方的光學式觸控螢幕來說，本實施例之光感測 态142於擷取觸控區si之影像時，不會因例如是手指或 觸控筆太過接近而誤判觸控位置。 以下係進一步說明本實施例之光轉向件13〇之形式 與配置。光轉向件130只設置在相對於兩個光感測器142 之該側，且包括一第一反射鏡131及一第二反射鏡132。 第一反射鏡131配置於基板11〇之上方，且第二反射鏡132 配置於相對於第一反射鏡131之一正下方。第一反射鏡131 設置於光學件120與第二反射鏡132之間，且第二反射鏡 132設置於光感測器142與第一反射鏡131之間。第一反 射鏡131與第二反射鏡132之間的夾角係實質上為9〇度。 請參照第2A及2B圖，第2A圖繪示第1B圖中之光源 產生光線後之光路徑的示意圖’且第2B圖繪示第2A圖中 之光學件回射光線之光路徑的示意圖。首先，如第2A圖 所不，光源141產生之光線進入觸控區S1後投射至第二 反射鏡132，且第二反射鏡132係反射光線至第一反射鏡 131。接著，第一反射鏡131係進一步反射光線使得光 線係投射至光學件120。由於本實施例之光學件12〇係為 回射器，因此，投射至光學件12〇之光線會沿著如第2a 圖所示之路徑反向地回射至光模組14〇之光感測器i42， 如第2B圖所示。如此一來，光感測器142係可藉由接收 光線產生之觸控區S1之影像來判斷觸控位置。 201201078 ' · I vv vj I ι^,ι r\ 凊參照第3圖’其緣示第圖中之光學式觸控面板 之等效示意圖。本實施例之光感測器142只透過光轉向件 130擷取觸控區S1之影像。由於本實施例之光轉向件13〇 之配置，因此，第1A圖之光模組14〇之光線投射範圍係 實質上等效於第3圖所示之光模組14〇，之光線投射範 圍。進一步來說，等效之兩個光感測器丨42，各具有一斜 向視野。於第3圖中，此兩個斜向視野係分別利用不同的 圖案填滿來表示出範圍。此兩個斜向視野係面向觸控區s工 修且實質交疊。如此一來，藉由上述之等效之兩個光感測器 142’所示之光線投射範圍可瞭解，相較於以往具有大視 角而導致景> 像變形之感測器來說，本實施例之光感測器 142的視角可較小，以有效地減少影像變形的情況，而提 升觸控位置之判斷上的準確性。 如上所述，本實施例之光轉向件13〇之配置係使得光 杈組140 (如第1A圖所示）之光線投射範圍係實質上等效 於，模組140 (如第3圖所示）之光線投射範圍。因此， ⑩本實施例係透過等效之光模組140，之配置來說明取得觸 控位置的機制。 凊參照第4圖，其繪示利用三角量測法來偵測觸控位 置之座標值的示意圖。假設手指或觸控筆之物體係位在觸 控區S1内，且物體之中心點係以點p表示。左側之光模 組14 0，係位於座標系統之原點〇處。右側之光模組丨4 〇，、 係位於座標系統之χ轴上的點Q處且左侧之光學件⑽ 係位於座標系統之y軸上。左側及右側之光模組14〇，之 間距係為L。 201201078 此處點P與原點〇之連線與χ軸之夾角例如是角度 0，且點P與點Q之連線與χ軸之夾角例如是角度0來說， 則依據下述之公式（1)及（2)，物體之中心點ρ的座桿 及Py係可分別計算出來：The image received by the device may be produced; ^ you; W This house is deformed, and the effect of determining the position of the touch is two, and how to provide an accurate photon touch screen that can determine the touch position. It is one of the topics for the relevant industry. 201201078. SUMMARY OF THE INVENTION The present invention generally provides an optical touch panel that improves the accuracy of determining a touch position through the configuration of the light sensor and the light redirecting member. Since the light sensor is located below the substrate and the touch area is located above the substrate, the light sensor can be largely reflected by the object being too close to increase the accuracy of determining the touch position. Moreover, through the arrangement of the light redirecting members, the viewing angle of the light sensor can be reduced to avoid the image from being deformed and affecting the accuracy of determining the touch position. According to the present invention, an optical touch panel is provided comprising a substrate, three optical members, a light redirecting member and two light sensors. The three optical members are disposed above the substrate and are adjacent to each other. The three optics are placed on the edge of the substrate. The light redirecting member is disposed on one side of the substrate, and a touch area is formed between the light redirecting member and the three optical members above the substrate. The two photo sensors are disposed below the substrate at opposite ends of one side of the substrate and disposed relative to the light redirecting member. The two light sensors capture the image of the touch area through the light redirecting member. According to the present invention, an optical touch panel is further provided, comprising a substrate, three light source modules, a light redirecting member and two light sensors. The substrate forms a touch area. The three light source modules are disposed above the substrate and disposed on the edge of the substrate. The light redirecting member is disposed on one side of the substrate. The light redirecting member and the three light source modules substantially surround the substrate. The two photo sensors are disposed below the substrate at opposite ends of the substrate and disposed relative to the light redirecting member. The two light sensors only capture images of the touch area through the light redirecting member. 4 201201078 • r I VVU i 1/. ΓΛ In order to make the above description of the present invention more comprehensible, the preferred embodiments are described below, and in conjunction with the accompanying drawings, the detailed description is as follows: The embodiment of the optical touch panel according to the first embodiment of the present invention is shown in the first embodiment, and the first side view of the optical touch panel according to the first embodiment of the present invention is shown in FIG. . Optical touch panel • 1〇0 includes a substrate 110, three optical members 120, a light redirecting member 13〇, and two optical modules 140. The three optical members 12 of the present embodiment are, for example, three retroreflective reeds disposed above the substrate 11A and adjacent to each other. The three optical members 120 are disposed on the edge of the substrate 11A. The light redirecting member 130 is disposed on one side of the substrate stack 10. A touch area S1 is formed between the light redirecting member 13 and the optical members 120 above the substrate 11A. The two optical modules 140 each include a light source 141 and a light sensor U2 disposed under the substrate 110. In more detail, the two photo sensors 142 are respectively located at the (four) ends of the other side of the substrate 110, and are disposed with respect to the light redirecting member 130. In addition, two light sources 141 are respectively disposed adjacent to the two photo sensors 42 and direct the light into the touch area S1. The two photo sensors 142 capture the image of the touch area S1 through the light redirecting member 130. That is, when the two light sources 141 generate light below the substrate 11, the light redirecting member 130 reflects the light to the optical member (retroreflector) 12A. Next, the optical member (retroreflector) 120 returns the light to the light redirecting member 13〇, 201201078 I ” vr i in r~v , , so that the light sensor 142 receives the light through the light redirecting member 13〇. The control area S1 is located above the substrate 11〇, and the photo sensor 142 is located below the substrate 110. Therefore, compared with the optical touch screen in which the conventional touch area and the sensor are disposed above the substrate, The light sensing state 142 of the embodiment does not misjudge the touch position because the finger or the stylus is too close, for example, when capturing the image of the touch area si. The light of the embodiment is further described below. The steering member 13 is in the form and configuration. The light redirecting member 130 is disposed only on the side opposite to the two photo sensors 142, and includes a first mirror 131 and a second mirror 132. The first mirror 131 The second mirror 132 is disposed directly below one of the first mirrors 131. The first mirror 131 is disposed between the optical member 120 and the second mirror 132, and is second. The mirror 132 is disposed between the photo sensor 142 and the first mirror 131. The angle between the mirror 131 and the second mirror 132 is substantially 9 degrees. Please refer to FIGS. 2A and 2B, and FIG. 2A is a schematic diagram of the light path after the light source of FIG. 1B generates light. 2B is a schematic view showing the optical path of the retroreflected light of the optical member in FIG. 2A. First, as shown in FIG. 2A, the light generated by the light source 141 enters the touch region S1 and is projected to the second mirror 132, and The second mirror 132 reflects the light to the first mirror 131. Then, the first mirror 131 further reflects the light so that the light is projected onto the optical member 120. Since the optical member 12 of the embodiment is a retroreflector, The light projected onto the optical member 12 反向 will be retroreflected back to the optical sensor 14 of the optical module 14 as shown in FIG. 2A, as shown in FIG. 2B. Thus, the light The sensor 142 can determine the touch position by receiving the image of the touch area S1 generated by the light. 201201078 ' · I vv vj I ι^, ι r\ 凊 Refer to Figure 3 An equivalent schematic diagram of the optical touch panel. The photo sensor 142 of the embodiment only passes through the light redirecting member 130撷The image of the touch area S1. Because of the arrangement of the light redirecting member 13 of the embodiment, the light projection range of the optical module 14 of FIG. 1A is substantially equivalent to the optical module shown in FIG. 14〇, the ray projection range. Further, the equivalent two photosensors 丨42 each have an oblique field of view. In Fig. 3, the two oblique fields of view are respectively filled with different patterns. The two oblique fields are facing the touch area s and are substantially overlapped. Thus, the ray projection range indicated by the two equivalent photo sensors 142' described above is used. It can be understood that the optical sensor 142 of the present embodiment can have a smaller viewing angle than the conventional sensor having a large viewing angle, and the image sensor 142 can be reduced in size to effectively reduce image distortion. The accuracy of the judgment of the touch position. As described above, the arrangement of the light redirecting members 13 of the present embodiment is such that the ray projection range of the pupil group 140 (as shown in FIG. 1A) is substantially equivalent to the module 140 (as shown in FIG. 3). ) The range of light projection. Therefore, in the present embodiment, the mechanism for obtaining the touch position is explained by the configuration of the equivalent optical module 140. Referring to FIG. 4, a schematic diagram of detecting the coordinate value of the touch position by using the triangulation method is shown. It is assumed that the finger or stylus system is located in the touch control area S1, and the center point of the object is indicated by the point p. The optical module 14 0 on the left is located at the origin of the coordinate system. The optical module 丨4 右侧 on the right is located at point Q on the x-axis of the coordinate system and the optical component (10) on the left is located on the y-axis of the coordinate system. The left and right optical modules 14 are spaced apart by a distance L. 201201078 Here, the angle between the line P and the origin 〇 and the χ axis is, for example, the angle 0, and the angle between the line connecting the point P and the point Q and the χ axis is, for example, the angle 0, according to the following formula ( 1) and (2), the seatpost and Py system of the center point ρ of the object can be calculated separately:
Px-(tan φ )-i-(tan Θ +tan ψ )xL (1)Px-(tan φ )-i-(tan Θ +tan ψ )xL (1)
Py=(tan Θ xtan φ )-=-(tan Θ +tan φ )xL (2) 如此一來，根據上述之三角量測法，物體之觸控位置（也 就是點P之座標值）即可得知。 第二實施例 請參照第5A圖及第5B圖，第5A圖繪示根據本發明 第二實施例之光學式觸控面板之上視圖，且第5β圖繪示 第5Α圖中之光學式觸控面板之側視圖。 相較於第一實施例，本實施例之光學式觸控面板2〇〇 之三個光學件220與光轉向件230之形式及配置方式與第 一實施例之光學式觸控面板1〇〇之三個光學件12〇與光轉 向件130之形式與配置方式不同。其他與第一實施例相同 之元件係以相同標號標註，且不再重複說明。 基板110形成一觸控區S1，’且例如是一矩形基板。 為矩形基板之基板110係具有第一側邊11〇sl、第二側邊 110s2、第三側邊ll〇s3及第四側邊11〇s4。第四側邊u〇s4 與第一側邊llOsl對設，且第二側邊11〇s2與第三側邊 110s3相鄰於第一側邊ii〇si與第四側邊11〇s4。 201201078 • · 1 wui ιζγ/λ. 光學式觸控面板200之三個光學件220係為三個光源 模組。此三個光學件220配置於基板no之上方且設置於 基板110之邊緣。本實施例之三個光學件220分別沿著基 板110之第一側邊ll〇sl、第二側邊11〇s2及第三側邊 110s3延伸，用以產生光線。 於本實施例中’光轉向件230係設置於基板no之一 侧邊，例如是第四側邊ll〇s4，更進一步來說，光轉向件 2 3 0係配置在基板11 〇之側壁上。如此一來，此三個光學 • 件22〇與光轉向件230係實質上包圍基板110。 兩個光感測器242配置於基板11 〇之下方，分別位於 基板110之相對兩端處’且相對於光轉向件230設置。也 就是說，本實施例之兩個光感測器242例如是設置於基板 110之第一側邊ll〇sl，以透過光轉向件23〇接收光線來 擷取觸控區S1’之影像。 光感測器242透過光轉向件230接收光線之方式係說 明如下。光轉向件230包括一第二反射面231及一第二反 φ 射面232。第一反射面231設置於光學件220與第二反射 面232之間’且第二反射面232設置於光感測器242與第 一反射面231之間。第一反射面231與第二反射面232之 間的夾角係實質上為90度。值得注意，在此實施例中光 轉向件230亦可採用前一實施例中之光轉向件130達成相 同功效。 請參照第6圖，其繪示第5B圖中之光源產生光線後 之光路徑的示意圖。為光源模組之光學件220產生之光線 係投射至第一反射面231。接著，第一反射面231係反射 201201078 I f 光線，使得光線係投射至第二反射面232。如此一來，第 二反射面232係進一步反射’使得光線係投射至光感測器 242。如此一來，光感測器242係可接收光線來判斷例如 是手指或是觸控筆位於觸控區S1’之觸控位置。 另外’請參照第7圖，其繪示第5A圖中之光學式觸 控面板之等效示意圖。本實施例之光感測器242只透過光 轉向件230擷取觸控區si，之影像。本實施例之光轉向件 230之配置係可提供類似於第一實施例之光轉向件1之 功能，使得光感測器242的光線投射範圍係實質上可等效 於如第7圖所示之光感測器242，的光線投射範圍。進一 步來說，等效之兩個光感測器242，各具有一斜向視野。 於第7圖中，此兩個斜向視野之範圍係分別利用不同的圖 案填滿來表示出範圍。此兩個斜向視野係面向觸控區S1， 且實質交疊。如此-來，藉由上述之等效之兩個光感測器 242所不之光線投射範圍可瞭解，相較於以往具有大視 角而導致影像變形之感測器來說，本實施例之光感測器 242的視角可較小，以有效地減少影像變形的情況，而提 升觸控位置之判斷上的準確性。 另外，物體於本實施例之光學式觸控面板2〇〇之觸控 區S1’的觸控位置係可例如是依據第一實施例中所述之 二角量測法得知’此處不再重複說明。 本發明上述實施例所揭露之光學式觸控面板，其透過 光感測器及光轉向件之配置來提高增加判斷觸控位置之 準確度。由於觸控區係位於基板之上方，且光感測器係配 置於基板之下方，因此，光感測器因物體過近而大量地反 201201078 ' · 1 wo I lj6l 光的情況可避免，以增加判斷觸控位置的準確度。再者， 透過光轉向件之配置，光感測器之視角可縮小，以避免影 像產生變形而影響判斷觸控位置的準確度。 … 綜上所述，雖然本發明已以較佳實施例揭露如上，然 其並非用以限定本發明。本發明所屬技術領域中具有通常 知識者，在不脫離本發明之精神和範圍内，當可作各種之 更動與潤飾。因此，本發明之保護範圍當視後附之申請專 利範圍所界定者為準。 【圖式簡單說明】 第1A圖繪示根據本發明第一實施例之光學式觸控面 板之上視圖。 第1B圖繪示第1Affi中之光學式觸控面板之側視圖。 第2A圖繪示第1B圖中之光源產生光線後之光路徑的 示意圖。 -第2B圖繪示第2A圖中之光學件回射紐之光路徑的 示意圖。 第3圖綠示$ ΙΑ ®中之光學式面板之等效示意 圖。 第4圖誇不利用三角量測法來偵測觸控位置之座標 值的示意圖。 第5A圖繪示根據本發明第二實施例之光學式觸控面 板之上視圖。 第5B圖綠示第5A目中之光學式觸控面板之側視圖。 第6圖输不第5β圖中之光源產生光線後之光路徑的 201201078 ·. 示意圖。 第7圖繪示第5A圖中之光學式觸控面板之等效示意 圆。 【主要元件符號說明】 100、200 :光學式觸控面板 110 :基板 llOsl :第一側邊Py=(tan Θ xtan φ )-=-(tan Θ +tan φ )xL (2) In this way, according to the above triangulation method, the touch position of the object (that is, the coordinate value of the point P) can be Learned. Referring to FIGS. 5A and 5B, FIG. 5A is a top view of the optical touch panel according to the second embodiment of the present invention, and FIG. 5 is a view showing the optical touch in the fifth diagram. Side view of the control panel. Compared with the first embodiment, the form and arrangement of the three optical members 220 and the light redirecting member 230 of the optical touch panel 2 of the present embodiment are the same as those of the optical touch panel of the first embodiment. The three optical members 12 and the light redirecting member 130 are different in form and arrangement. The same components as those of the first embodiment are denoted by the same reference numerals and the description thereof will not be repeated. The substrate 110 forms a touch area S1, and is, for example, a rectangular substrate. The substrate 110 which is a rectangular substrate has a first side 11〇sl, a second side 110s2, a third side 11〇s3, and a fourth side 11〇s4. The fourth side edge u〇s4 is opposite to the first side edge 11Os1, and the second side edge 11〇s2 and the third side edge 110s3 are adjacent to the first side edge ii〇si and the fourth side edge 11〇s4. 201201078 • · 1 wui ιζγ/λ. The three optical components 220 of the optical touch panel 200 are three light source modules. The three optical members 220 are disposed above the substrate no and are disposed at the edge of the substrate 110. The three optical members 220 of the embodiment extend along the first side edge 11s1, the second side 11〇s2, and the third side 110s3 of the substrate 110, respectively, for generating light. In the present embodiment, the light redirecting member 230 is disposed on one side of the substrate no, for example, the fourth side 〇 〇 s4. Further, the light redirecting member 203 is disposed on the side wall of the substrate 11 . As a result, the three optical components 22 and the light redirecting member 230 substantially surround the substrate 110. The two photo sensors 242 are disposed below the substrate 11 , at the opposite ends of the substrate 110 and are disposed relative to the light redirecting member 230. In other words, the two photo sensors 242 of the present embodiment are disposed on the first side of the substrate 110, for example, to receive light through the light redirecting member 23 to capture the image of the touch area S1'. The manner in which the photo sensor 242 receives light through the light redirecting member 230 is as follows. The light redirecting member 230 includes a second reflecting surface 231 and a second inverse φ emitting surface 232. The first reflective surface 231 is disposed between the optical member 220 and the second reflective surface 232, and the second reflective surface 232 is disposed between the photo sensor 242 and the first reflective surface 231. The angle between the first reflecting surface 231 and the second reflecting surface 232 is substantially 90 degrees. It should be noted that in this embodiment, the light redirecting member 230 can also achieve the same effect by using the light redirecting member 130 in the previous embodiment. Please refer to FIG. 6 , which is a schematic diagram showing the light path after the light source of FIG. 5B generates light. Light rays generated for the optical member 220 of the light source module are projected onto the first reflecting surface 231. Next, the first reflecting surface 231 reflects the 201201078 I f light so that the light is projected onto the second reflecting surface 232. As such, the second reflective surface 232 is further reflected' such that light is projected onto the photosensor 242. In this way, the light sensor 242 can receive light to determine, for example, that the finger or the stylus is located at the touch position of the touch area S1'. In addition, please refer to Fig. 7, which shows an equivalent schematic diagram of the optical touch panel in Fig. 5A. The light sensor 242 of the embodiment only captures the image of the touch area si through the light redirecting member 230. The configuration of the light redirecting member 230 of the present embodiment can provide a function similar to that of the light redirecting member 1 of the first embodiment, such that the light projection range of the photo sensor 242 is substantially equivalent to that shown in FIG. The light sensor 242, the light projection range. Further, the equivalent two photosensors 242 each have an oblique field of view. In Figure 7, the range of the two oblique fields of view is filled with different patterns to indicate the range. The two oblique fields of view face the touch area S1 and substantially overlap. In this way, it can be understood that the light projection range of the two equivalent photosensors 242 described above is light of the present embodiment compared to a sensor having a large viewing angle and causing image distortion. The angle of view of the sensor 242 can be small to effectively reduce the image distortion and improve the accuracy of the judgment of the touch position. In addition, the touch position of the object in the touch area S1' of the optical touch panel 2 of the embodiment can be, for example, according to the two-dimensional measurement method described in the first embodiment. Repeat the explanation. The optical touch panel disclosed in the above embodiments of the present invention improves the accuracy of determining the touch position by transmitting the light sensor and the light redirecting member. Since the touch area is located above the substrate, and the photo sensor is disposed below the substrate, the photo sensor can be avoided by a large amount of anti-201201078 ' · 1 wo I lj6l light due to the object being too close. Increase the accuracy of determining the touch position. Moreover, through the configuration of the light redirecting member, the viewing angle of the photo sensor can be reduced to avoid deformation of the image and affect the accuracy of determining the touch position. The invention has been described above by way of a preferred embodiment, and is not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a top view of an optical touch panel according to a first embodiment of the present invention. FIG. 1B is a side view of the optical touch panel in the first Affi. Fig. 2A is a schematic view showing the light path after the light source of Fig. 1B generates light. - Figure 2B is a schematic view showing the optical path of the optical member retroreflective beam in Figure 2A. Figure 3 shows the equivalent diagram of the optical panel in $ ΙΑ ® . Figure 4 is a schematic diagram of the use of triangulation to detect the coordinate value of the touch position. Fig. 5A is a top view of the optical touch panel according to the second embodiment of the present invention. Fig. 5B is a green side view showing the optical touch panel of the fifth object. Figure 6 is a diagram showing the light path of the light source after the light source in the 5th figure is generated. Figure 7 is a diagram showing an equivalent schematic circle of the optical touch panel in Figure 5A. [Main component symbol description] 100, 200: optical touch panel 110: substrate llOsl: first side
110s2 :第二側邊 110s3 :第三側邊 110s4 :第四側邊 120、220 :光學件 130、230 :光轉向件 131 :第一反射鏡 132 :第二反射鏡 140、140’ ：光模組110s2: second side 110s3: third side 110s4: fourth side 120, 220: optical member 130, 230: light redirecting member 131: first reflecting mirror 132: second reflecting mirror 140, 140': optical mode group
141 :光源 142、142’ 、242、242’ ：光感測器 231 :第一反射面 232 :第二反射面 L :間距 0 :原點 P、Q :點 S1、S1’ ：觸控區 θ、p :角度 12141: light source 142, 142', 242, 242': photo sensor 231: first reflecting surface 232: second reflecting surface L: pitch 0: origin P, Q: point S1, S1': touch area θ , p: angle 12