200946878 ·九、發明說明： .【發明所屬之技術領域】 本發明涉及一種測距系統，一種相應之測距方法，以 及一種使用該測距系統、測距方法之電子裝置系統及遙控 '器。 【先前技術】 目前’現有之測距方式除利用尺具直接測量外，還包 括利用標竿配合儀器測量，藉由計算其對應角度而推算出 Ο距離之方法。惟，因尺具需要人力去丈量，而標竿配合儀 器測量時’則需要一人插設標竿，另一人操控儀器，操作 均不方便。 近年來’雷射測距法被廣泛應用於距離之測量上，而 雷射測距儀亦成為距離測量之重要工具，其原理係由一雷 射發射器對目標物發射出一脈衝訊號，再由一低雜訊、高 敏感度之雷射接收器接收由該目標物反射回來之訊號，利 用該接收到之反射訊號即可計算出目標物之距離。惟，雷 射測距儀成本較為昂貴，其一般應用於太空測距領域中。 另’當今之電視機、遊戲機等電子裝置與其遙控器之 間常有一距離限定，使用者需位於該限定距離範圍内，其 手持之遙控器才能對電子裝置進行正常操控，故可測距之 遙控器將會對使用者有很大幫助。具體可參閱Sasaki，T·等 人於 Intelligent Robots and Systems, 2004· (IROS 2004). Proceedings. 2004 IEEE/RSJ International Conference on Volume 1，28 Sept.-2 Oct. 2004 Page(s):748 _ 753 vol.l 上發 200946878 '表之 DeveloPment of remote control system of construction machinery using pneumatic robot arm —文。 然而上述之測距方法或不便於使用，或由於使用於測 距之儀器，例如雷射測距儀架構複雜，佔用空間大而不適 合裝配於電視機、遊戲機等電子裝置中或其遙控器中。 【發明内容】 有鑒於此，提供一種架構簡單之測距系統、測距方法， 以及使用該測距系統、測距方法之電子裝置系統及遙控器 ®實為必要。 一種測距系統，包括一光源；一影像感測裝置，該影 像感測裝置包括一第一鏡頭、一第二鏡頭及一影像感測 器’該第一鏡頭與該第二鏡頭間隔一定距離，該影像感測 器分別與該第一及第二鏡頭相對設置，該第一鏡頭具有一 第一焦距’該第二鏡頭具有一第二焦距’該光源分別發射 光線至該第一與第二鏡頭’該影像感測器分別於對應於該 〇 ^ 與第一鏡頭之兩個感光位置上感測該光線，且該影像 感測器具有分別對應於該第一與第二鏡頭中心之兩個中心 感光點’該影像感測器感測兩個感光位置分別與該影像感 測器之兩個中心感光點之間之距離，該光線與該第一及第 二鏡頭之中心之間之連線分別定義一夾角；以及一訊號處 理電路’該訊號處理電路分別處理得到該兩個距離與其所 對應之第一及第二鏡頭之焦距之間之比值，並根據該兩個 比值分別獲取該兩個夾角之數值，進而獲取該光源到該第 一及第二鏡頭之連線之垂直距離。 200946878 -種測距方法，其包括如下步驟：將—光源設置於被 .測地點；於測距地點採用一影像感測裝置感測該光源發出 之光線，該影像感測裝置包括一第一鏡頭、一第二鏡頭及 一影像感測器，該第一鏡頭與該第二鏡頭間隔一定距離， 該影像感測器分別與該第一及第二鏡頭相對設置，該第一 鏡頭具有一第一焦距，該第二鏡頭具有一第二焦距，該光 源分別發射光線至該第一與第二鏡頭，該影像感測器分別 ❹於對應於該第一與第二鏡頭之兩個感光位置上感測該光 線，且該影像感測器具有分別對應於該第一與第二鏡頭中 心之兩個中心感光點，該影像感測器感測兩個感光位置分 別與該影像感測器之兩個中心感光點之間之距離，該光線 與該第一及第二鏡頭之中心之間之連線分別定義一夾角； 採用一訊號處理電路分別處理得到該兩個距離與其所對應 之第一及第二鏡頭之焦距之間之比值，並根據該兩個比值 分別獲取該兩個夾角之數值’進而獲取該光源到該第一及 ❹第二鏡頭之連線之垂直距離。分別計算該兩個距離與其所 對應之焦距之比值’並根據該兩個比值分別獲取該兩個夾 角之數值，進而獲取該光源到該第一及第二鏡頭之連線之 垂直距離。 一種電子裝置系統，包括一電子裝置及一遙控器，該 電子裝置包括一光源，該遙控器包括一影像感測裝置及一 訊號處理電路，該影像感測裝置包括一第一鏡頭、一第二 鏡頭及一影像感測器，該第一鏡頭與該第二鏡頭間隔一定 距離，該影像感測器分別與該第一及第二鏡頭相對設置， 9 200946878 該第一鏡頭具有一第一焦距，該第二鏡頭具有一第二焦 距，該光源分別發射光線至該第一與第二鏡頭，該影像感 測器分別於對應於該第-與第=鏡頭<兩個感光位置上感 測該光線，且該影像感測器具有分別對應於該第一與第二 鏡頭中〜之兩個中心感光點，該影像感測器感測兩個感光 位置分別與該影像感測器之兩個中心感光點之間之距離， 該光線與該第一及第二鏡頭之中心之間之連線分別定義一 夾角；該訊號處理電路分別處理得到該兩個距離與其所對 應之第-及第二鏡頭之焦距之間之比值，並根據該兩個比 值分別獲取該兩個夾角之數值，進而獲取該光源到該第一 及第二鏡頭之連線之垂直距離。 一種電子裝置系統，包括一電子裝置及一遙控器，該 電子裝置包括一影像感測襄置及一訊號處理轉，該遙控 器包括一光源，該影像感測裝置包括一第一鏡頭、一第二 鏡頭及一影像感測器，該第一鏡頭與該第二鏡頭間隔一定 〇距離，該影像感測器分別與該第一及第二鏡頭相對設置， 該第一鏡頭具有一第一焦距，該第二鏡頭具有一第二焦 距，該光源分別發射光線至該第一與第二鏡頭，該影像感、 測器分別於對應於該第-與第二鏡頭之兩個感光位置上感 測該光線，且該影像感測器具有分別對應於該第一與第二 鏡頭中心之兩個中心感光點，該影像感測器感測兩個感光 位置分別與該影像感測器之兩個中心感光點之間之距離， 該光線與該第-及第二鏡頭之中心之間之連線分別定義一 夹角；該訊號處理電路分別處理得到該兩個距離與其所對 200946878 應之第一及第二鏡頭之焦距之間之比值，並根據該兩個比 值分別獲取該兩個爽角之數值’進而獲取該光源到該第一 及第二鏡頭之連線之垂直距離。 一種遙控器，用於搖控一電子裝置，該電子裝置包括 一光源，該遙控器包括一影像感測裝置及一訊號處理電 路’該影像感測裝置包括一第一鏡頭、一第二鏡頭及一影 像感測器’該第一鏡頭與該第二鏡頭間隔一定距離，該影 _像感測器分別與該第一及第二鏡頭相對設置，該第一鏡頭 具有一第一焦距，該第二鏡頭具有一第二焦距，該光源分 別發射光線至該第一與第二鏡頭，該影像感測器分別於對 應於該第一與第二鏡頭之兩個感光位置上感測該光線，且 該影像感測器具有分別對應於該第一與第二鏡頭中心之兩 個中心感光點’該影像感測器感測兩個感光位置分別與該 影像感測器之兩個中心感光點之間之距離，該光線與該第 一及第二鏡頭之中心之間之連線分別定義一夾角；該訊號 ❾處理電路分別處理得到該兩個距離與其所對應之第一及第 二鏡頭之焦距之間之比值，並根據該兩個比值分別獲取該 兩個夾角之數值，進而獲取該光源到該第一及第二鏡頭之 連線之垂直距離。 一種遙控器，用於搖控一電子裝置，該電子裝置包括 一影像感測裝置及一訊號處理電路，該遙控器包括一光 源’該影像感測裝置包括一第一鏡頭、一第二鏡頭及一影 像感測器’該第一鏡頭與該第二鏡頭間隔一定距離，該影 像感測器分別與該第一及第二鏡頭相對設置，該第一鏡頭 11 200946878 •具有-第-焦距，該第二鏡頭具有—第二焦距，該光源分 別發射光線至該第一與第二鏡頭，該影像感測器分別於對 應於該第-與第二鏡頭之兩個感光位置上感韻光線，且 該影像❹彳器具有分賴應於該第—與第二鏡頭中心之兩 個中〜感光點，該影像感測器感測兩個感光位置分別與該 影像感測器之兩個中心感光點之間之距離，該光線與該第 -及第二鏡頭之t心之間之連線分収義一炎角；該訊號 肇處理電路分別處理得到該兩個距離與其所對應之第一及第 二鏡頭之焦距之間之比值，並根據該兩個比值分別獲取該 兩個夾角之數值，進而獲取該光源到該第一及第二鏡頭之 連線之垂直距離。 相對於先前技術，該測距系統於測距時使用兩個距離 已知之第一鏡頭與第二鏡頭，以及一影像感測器感測光源 所於位置，從而可採用一訊號處理電路根據光路三角形函 數關係計算出光源與包含該第一鏡頭、第二鏡頭、影像感 ❹測器之影像感測裝置之大致距離。由於該光源與該影像感 貝J裝置均具有較為簡單之架構及較小之體積，故該測距系 統適合女裝於電子產品中，以測量該電子產品所包含之兩 個相對部件之大致距離。 【實施方式】 下面將結合圖式對本發明提供之測距系統、測距方 法、電子裝置系統以及遙控器作進一步地詳細說明。 請參閱圖1，本發明實施例提供之測距系統1〇〇，其包 括一光源10、一影像感測裝置20及一訊號處理電路5〇。 12 200946878 該光源ίο可為鹵素燈、螢光燈或發光二極體。 • 該影像感測裝置20包括一第一鏡頭22、一第二鏡頭 32及一影像感測器24。具體地，該第一鏡頭22與該第二 鏡頭32之間間隔一定距離L，該第一鏡頭22具有一第一焦 距Fi，該第二鏡頭32具有一第二焦距F2。該影像感測器 24分別與該第一及第二鏡頭22、32相對設置，其可選自電 荷柄合器件Charge Coupled Device，簡稱CCD或互補金屬 氧化物半導體電晶體 Complementary Metal Oxide ® Semiconductor Transistor，簡稱 CMOS。 該訊號處理電路50與該影像感測器24電性連接。 該測距系統100可採用如下方法測量被測地點A與測 距地點B之距離： (1) 將該光源10設置於被測地點A。 (2) 於測距地點B採用該影像感測裝置20感測該光源 10發出之光線，包括圖1中透射過第一及第二鏡頭22，32 @ 之光線Cr C2,該影像感測器24於分別於對應於該第一與 第二鏡頭22,32之兩個感光位置26,36上感測該光線Ci， C2，該影像感測器24具有分別對應於該第一與第二鏡頭 22，32之兩個中心感光點，該兩個感光位置26，36與該影 像感測器24之兩個中心感光點各相距一距離Di，D2。 (3) 採用該訊號處理電路50分別處理得到該兩個距離 Di，02與其所對應之第一及第二鏡頭22，32之焦距F!， F2之間之比值，即Di/Fi，D2/F2。 於上述測距步驟中，由於該影像感測裝置20中之第一 13 200946878 及第二鏡頭22 ’ 32 ’其與影像感測器24之間之距離可分別 设計得很短小，故被測地點A與測距地點B之垂直距離即 光源10到該影像感測裝置20之垂直距離便可看成係該光 源1〇到該第一及第二鏡頭22,32之連線C3之垂直距離X。 而於求該垂直距離X時可依據如下原理：當該光源1〇 與該第一及第二鏡頭22, 32之距離，即成像之物距足夠遠 時，成像之像距會近似於焦距匕，F2。故，將該影像感測 鬱器24設置於近似於焦距心，^之位置，即可較清晰感測到 一疋長度距離以外之光，而無需裝設對焦驅動結構。進一 步地，根據三角形函數關係，該Dl/Fi，〇2/1?2之數值分別 近似等於該光線Ci ’ C；2與該鏡頭22，32之中心之間之連 線a之夾角之餘角θ3，θ4之正切值，從而該夾角心， 〇2便可求解得到。而再次根據三角形原理，即可推導得出 上述距離X為χ — 。 tan01 + tan02 該測距系統100之測距原理簡單，且其所使用之硬體， ❾包括該光源10,該影像感測裝置20均具有較為簡單之架構 及較小之體積，故該測距系統100適合安裝 以測量該電子產品所包含之兩個相對部件裝之於大電:產離™。中’ 另，於上述利用測距系統100測量被測地點A與測距 地點B之距離之過財，為使光線Cl，[2於透射過該第一 鏡碩22與該第二鏡頭32時，其不會因為第一鏡頭與第 二鏡頭32之光學特性’如—定程度上之反射等而發生相互 干擾’於採用該影像感測裝置20感測該光源10發出之光 線前，可提供-吸光板28，並將該吸歧28設置於該第一 200946878 • 與第二鏡頭22，32之間，由此，當該第一鏡頭22或該第 • 二鏡頭32反射光至該吸光板28上時，該吸光板28可吸收 該反射光，從而最大限度地降低反射光於測量過程中對第 一及第二鏡頭22, 32之干擾作用。 請參閱圖2，該測距系統100可應用於電子裝置2〇〇 與遙控器400所組成之電子產品中，該電子裴置2〇〇可為 遊戲機或電視機等，其具有顯示功能，該遙控器400與該 鲁電子裝置200可採用紅外訊號相電性連接以進行相關操 控。具體地，該測距系統100之光源10裝設於該電子裝置 200中’而該測距系統1〇〇所包含之影像感測裝置2〇及訊 號處理電路50則裝設於該遙控器400中。當使用者手持該 遙控器400並位於該電子裝置200前之某一位置時，其可 操控該遙控器400，以檢驗該遙控器4〇〇與該電子裝置2〇〇 是否可進行紅外訊號連接，即該電子裝置2〇〇是否位於該 遙控器400之正常操控範圍内。 ❹ 如圖3所示，於另一實施例中，該光源1〇裝設於一遙 控器500中，而該影像感測裝置2〇，以及該訊號處理電路 %則裝設於一電子裝置3〇〇中。使用者同樣可藉由操控該 遙控器500,以檢驗該電子裝置3〇〇是否位於該遙控器5〇〇 之正常操控範圍内。 θ綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 技β之人士援依本發明之精神所作之等效修飾或變化，皆 15 200946878 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明實施例提供之測距系統光路示意圖。 圖2及圖3均係圖1提供之測距系統應用於電子裝置 及遙控器之示意圖。 【主要元件符號說明】 光源 影像感測裝置 ® 鏡頭 影像感測器 感光位置 吸光板 訊號處理電路 測距系統 電子裝置 遙控器 Q 被測地點 測距地點 夾角 餘角 光線 連線 焦距 距離 10 20 22、32 24 26、36 28 50 100 200、300 400、500 A B θι ' 〇2 Θ3、Θ4 Cl' c2 C3 Fi、F2 X、L、Di、D2 16200946878 · IX. INSTRUCTION DESCRIPTION: TECHNICAL FIELD The present invention relates to a ranging system, a corresponding ranging method, and an electronic device system and remote control using the ranging system and the ranging method. [Prior Art] At present, the existing ranging method uses direct measurement by a ruler, and includes a method of measuring the corresponding distance by using the standard to measure the corresponding distance. However, because the ruler requires manpower to measure, and the standard is used in conjunction with the instrument to measure, one person needs to insert the standard, and the other person controls the instrument, which is inconvenient to operate. In recent years, 'the laser ranging method is widely used in the measurement of distance, and the laser range finder has become an important tool for distance measurement. The principle is that a laser transmitter emits a pulse signal to the target, and then The low-noise, high-sensitivity laser receiver receives the signal reflected by the target, and uses the received reflected signal to calculate the distance of the target. However, laser range finder is relatively expensive and is generally used in the field of space ranging. In addition, there is often a distance between the electronic devices such as TV sets and game consoles and their remote controllers. The user needs to be within the defined distance range. The handheld remote control can control the electronic device normally, so the distance can be measured. The remote control will be of great help to the user. See, for example, Sasaki, T. et al., Intelligent Robots and Systems, 2004. (IROS 2004). Proceedings. 2004 IEEE/RSJ International Conference on Volume 1, 28 Sept.-2 Oct. 2004 Page(s): 748 _ 753 Vol.l issued 200946878 'Development of remote control system of construction machinery using pneumatic robot arm. However, the above-mentioned ranging method is not convenient to use, or because the instrument used for ranging, such as a laser range finder, has a complicated architecture and a large space, and is not suitable for being mounted in an electronic device such as a television or a game machine or a remote controller thereof. . SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a ranging system with a simple architecture, a ranging method, and an electronic device system and a remote controller using the ranging system and the ranging method. A distance measuring system includes a light source; an image sensing device, the image sensing device includes a first lens, a second lens, and an image sensor. The first lens is spaced apart from the second lens by a distance. The image sensor is respectively disposed opposite to the first and second lenses, the first lens has a first focal length 'the second lens has a second focal length', and the light source respectively emits light to the first and second lenses The image sensor senses the light at two photosensitive positions corresponding to the first lens and the first lens, and the image sensor has two centers respectively corresponding to the first and second lens centers Sensing point 'The image sensor senses the distance between the two photosensitive positions and the two central photosensitive points of the image sensor, and the connection between the light and the center of the first and second lenses respectively Defining an angle; and a signal processing circuit 'the signal processing circuit respectively processing the ratio between the two distances and the focal lengths of the first and second lenses corresponding thereto, and respectively acquiring the ratio according to the two ratios The values of the two angles further obtain the vertical distance of the light source to the line connecting the first and second lenses. 200946878 - a method for ranging, comprising the steps of: setting a light source to a location to be measured; sensing an image of the light source by using an image sensing device at the ranging location, the image sensing device comprising a first lens a second lens and an image sensor, the first lens is spaced apart from the second lens by a distance, the image sensor is respectively disposed opposite to the first and second lenses, and the first lens has a first Focal length, the second lens has a second focal length, the light source respectively emits light to the first and second lenses, and the image sensor respectively senses two photosensitive positions corresponding to the first and second lenses Detecting the light, and the image sensor has two central photosensitive points respectively corresponding to the first and second lens centers, and the image sensor senses two photosensitive positions respectively and two of the image sensors The distance between the central photosensitive points, the line connecting the light and the center of the first and second lenses respectively defines an angle; the first processing is performed by a signal processing circuit to obtain the first distance and the corresponding first And a ratio between the focal lengths of the second lens, and respectively obtaining the values of the two included angles according to the two ratios to obtain a vertical distance of the light source to the first and second lens lines. Calculating the ratio of the two distances to their corresponding focal lengths respectively, and obtaining the values of the two angles according to the two ratios, respectively, and obtaining the vertical distance of the light source to the line connecting the first and second lenses. An electronic device system includes an electronic device and a remote controller, the electronic device includes a light source, the remote controller includes an image sensing device and a signal processing circuit, and the image sensing device includes a first lens and a second a lens and an image sensor, the first lens is spaced apart from the second lens by a distance, and the image sensor is respectively disposed opposite to the first and second lenses, 9 200946878 the first lens has a first focal length, The second lens has a second focal length, the light source respectively emitting light to the first and second lenses, and the image sensor respectively senses the two photosensitive positions corresponding to the first and the second lens Light, and the image sensor has two central photosensitive points respectively corresponding to the first and second lenses, and the image sensor senses two photosensitive positions and two centers of the image sensor respectively The distance between the photosensitive dots, the line connecting the light and the center of the first and second lenses respectively defines an angle; the signal processing circuit respectively processes the two distances and the corresponding ones thereof - The ratio between the focal length of the second lens, and acquires the value of the angle between two compared values based on the two, and thus to obtain the source of the vertical distance from the connecting of the first and second lens. An electronic device system includes an electronic device and a remote controller, the electronic device includes an image sensing device and a signal processing switch, the remote controller includes a light source, and the image sensing device includes a first lens and a first a second lens and an image sensor, the first lens is spaced apart from the second lens by a distance, the image sensor is respectively disposed opposite to the first and second lenses, and the first lens has a first focal length. The second lens has a second focal length, the light source respectively emitting light to the first and second lenses, and the image sensor and the sensor respectively sense the two photosensitive positions corresponding to the first and second lenses Light, and the image sensor has two central photosensitive points respectively corresponding to the first and second lens centers, and the image sensor senses two photosensitive positions respectively and is sensitive to two centers of the image sensor The distance between the points, the line connecting the light and the center of the first and second lenses respectively define an angle; the signal processing circuit separately processes the two distances and the first of the 200946878 And a ratio between the focal lengths of the second lens, and respectively obtaining the values of the two refreshing angles according to the two ratios to obtain a vertical distance of the light source to the first and second lenses. A remote control for remotely controlling an electronic device, the electronic device includes a light source, the remote control includes an image sensing device and a signal processing circuit. The image sensing device includes a first lens and a second lens. An image sensor of the first lens is spaced apart from the second lens by a distance, the image sensor is disposed opposite to the first lens and the second lens, and the first lens has a first focal length, the first lens The second lens has a second focal length, the light source respectively emitting light to the first and second lenses, and the image sensor respectively senses the light at two photosensitive positions corresponding to the first and second lenses, and The image sensor has two central photosensitive points corresponding to the first and second lens centers respectively. The image sensor senses two photosensitive positions respectively between the two central photosensitive points of the image sensor. a distance between the light and the center of the first and second lenses respectively defines an angle; the signal processing circuit respectively processes the distance between the two distances and the corresponding first and second lenses The ratio between, and to obtain the values of the two angles of the two ratios are based on the thus acquired distance from the source to the vertical connection of the first and the second lens. A remote control for remotely controlling an electronic device, the electronic device comprising an image sensing device and a signal processing circuit, the remote controller comprising a light source, the image sensing device comprising a first lens and a second lens An image sensor is disposed at a distance from the second lens, and the image sensor is disposed opposite to the first and second lenses, respectively. The first lens 11 200946878 has a - focus-focus, The second lens has a second focal length, the light source respectively emitting light to the first and second lenses, and the image sensor respectively senses the radiant light at the two photosensitive positions corresponding to the first and second lenses, and The image detector has two photosensitive points corresponding to the first and second lens centers, and the image sensor senses two photosensitive positions and two central photosensitive points of the image sensor respectively. a distance between the light and the t-center of the first and second lenses is divided into an inflammatory angle; the signal processing circuit respectively processes the two distances corresponding to the first and second Focal length of the lens The ratio between the two, and the values of the two angles are respectively obtained according to the two ratios, thereby obtaining the vertical distance of the light source to the line connecting the first and second lenses. Compared with the prior art, the ranging system uses two first and second lenses with known distances for ranging, and an image sensor senses the position of the light source, so that a signal processing circuit can be used according to the optical path triangle. The functional relationship calculates the approximate distance between the light source and the image sensing device including the first lens, the second lens, and the image sensor. Since the light source and the image sensing device have a relatively simple structure and a small volume, the distance measuring system is suitable for women in electronic products to measure the approximate distance between two opposing components included in the electronic product. . [Embodiment] The ranging system, the ranging method, the electronic device system, and the remote controller provided by the present invention will be further described in detail below with reference to the drawings. Referring to FIG. 1, a ranging system 1A according to an embodiment of the present invention includes a light source 10, an image sensing device 20, and a signal processing circuit 5A. 12 200946878 The light source ίο can be a halogen lamp, a fluorescent lamp or a light emitting diode. The image sensing device 20 includes a first lens 22, a second lens 32, and an image sensor 24. Specifically, the first lens 22 and the second lens 32 are separated by a distance L. The first lens 22 has a first focal length Fi, and the second lens 32 has a second focal length F2. The image sensor 24 is disposed opposite to the first and second lenses 22 and 32 respectively, and may be selected from a charge coupled device, a CCD or a complementary metal oxide semiconductor transistor, Complementary Metal Oxide ® Semiconductor Transistor. Referred to as CMOS. The signal processing circuit 50 is electrically connected to the image sensor 24. The ranging system 100 can measure the distance between the measured location A and the ranging location B by the following method: (1) The light source 10 is placed at the measured location A. (2) sensing, by the image sensing device 20, the light emitted by the light source 10 at the ranging location B, including the light C1 passing through the first and second lenses 22, 32 @ in FIG. 1 , the image sensor The light rays Ci, C2 are respectively sensed on the two photosensitive positions 26, 36 corresponding to the first and second lenses 22, 32, and the image sensors 24 have corresponding to the first and second lenses, respectively. The two central sensing points of the 22, 32 are separated from the two central photosensitive points of the image sensor 24 by a distance Di, D2. (3) The signal processing circuit 50 respectively processes the ratio between the two distances Di, 02 and the focal lengths F!, F2 of the first and second lenses 22, 32 corresponding thereto, that is, Di/Fi, D2/ F2. In the above-mentioned ranging step, since the distance between the first 13 200946878 and the second lens 22 ' 32 ' in the image sensing device 20 and the image sensor 24 can be designed to be short, respectively, the measured The vertical distance between the location A and the ranging location B, that is, the vertical distance of the light source 10 to the image sensing device 20 can be regarded as the vertical distance from the light source 1 to the connecting line C3 of the first and second lenses 22, 32. X. The vertical distance X can be obtained according to the following principle: when the distance between the light source 1 and the first and second lenses 22, 32, that is, the distance of the imaged object, is far enough, the image distance of the image is approximated to the focal length. , F2. Therefore, the image sensing device 24 is disposed at a position close to the focal length, and the light outside the length distance can be clearly sensed without the need to mount the focus driving structure. Further, according to the triangular function relationship, the values of the D1/Fi, 〇2/1?2 are respectively approximately equal to the complementary angles of the angle between the ray Ci' C; 2 and the line a between the lenses 22, 32. The tangent of θ3, θ4, and thus the angle of intersection, 〇2 can be solved. And again according to the triangle principle, it can be derived that the above distance X is χ - . Tan01 + tan02 The ranging principle of the ranging system 100 is simple, and the hardware used therein includes the light source 10. The image sensing device 20 has a relatively simple structure and a small volume, so the ranging The system 100 is adapted to be installed to measure the two opposing components contained in the electronic product to be packaged in a large power: ProductionTM. In addition, in the above, the distance measuring system 100 is used to measure the distance between the measured location A and the ranging location B, so that the light C1, [2] is transmitted through the first mirror 22 and the second lens 32. It does not interfere with each other due to the optical characteristics of the first lens and the second lens 32, such as a certain degree of reflection, etc., before the image sensing device 20 senses the light emitted by the light source 10, a light absorbing plate 28, and the suction portion 28 is disposed between the first 200946878 and the second lens 22, 32, whereby when the first lens 22 or the second lens 32 reflects light to the light absorbing plate When 28 is on, the light absorbing plate 28 can absorb the reflected light, thereby minimizing the interference effect of the reflected light on the first and second lenses 22, 32 during the measurement. Referring to FIG. 2, the ranging system 100 can be applied to an electronic product composed of an electronic device 2A and a remote controller 400. The electronic device 2 can be a game machine or a television set and the like, and has a display function. The remote controller 400 and the electronic device 200 can be electrically connected by an infrared signal for related manipulation. Specifically, the light source 10 of the ranging system 100 is installed in the electronic device 200, and the image sensing device 2 and the signal processing circuit 50 included in the ranging system 1 are installed in the remote controller 400. in. When the user holds the remote controller 400 and is located at a position in front of the electronic device 200, the user can control the remote controller 400 to check whether the remote controller 4 and the electronic device 2 are capable of infrared signal connection. That is, whether the electronic device 2 is located within the normal control range of the remote controller 400. As shown in FIG. 3, in another embodiment, the light source 1 is mounted in a remote controller 500, and the image sensing device 2 and the signal processing circuit % are mounted on an electronic device 3. In the middle. The user can also control whether the electronic device 3 is located within the normal control range of the remote controller 5 by controlling the remote controller 500. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application in accordance with the law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art of the present invention in accordance with the spirit of the present invention are intended to be included in the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an optical path of a ranging system according to an embodiment of the present invention. 2 and 3 are schematic diagrams showing the application of the ranging system provided in FIG. 1 to an electronic device and a remote controller. [Main component symbol description] Light source image sensing device® Lens image sensor Photosensitive position light absorbing plate Signal processing circuit Ranging system Electronic device remote control Q Location of the measured location Angle of the angle of the ray connection focal length 10 20 22, 32 24 26, 36 28 50 100 200, 300 400, 500 AB θι ' 〇2 Θ3, Θ4 Cl' c2 C3 Fi, F2 X, L, Di, D2 16