200945863 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種行動電話。 【先前技術】 行動電話具有攜帶方便，操作簡單等優點，已被廣泛 應用為個人行動通訊設備》 請參閱圖1，係一種先前技術行動電話之平面示意 圖。該行動電話1包括一顯示區域11及一控制區域12。 ®該顯示區域11用於顯示各種操作界面。該控制區域12包 括複數按鍵120。使用者藉由該按鍵120對該行動電話1 進行控制操作。 請一併參閱圖2，係該行動電話1之按鍵120之結構 示意圖。該按鍵120包括一第一基板121、一與該第一基 板121相對間隔設置之第二基板122、一設置於該第二基 板122之遠離該第一基板121之表面之鍵墊123及複數設 置於該第一基板121之靠近該第二基板122之表面之開關 w元件125。該第二基板122設置複數開口 127。該開口 127 對應設置於該開關元件125之位置。該鍵墊123包括一向 外凸起之觸動面1231及一自該觸動面1231向下延伸之觸 動桿1232。該觸動桿1232穿過該第二基板122之開口 127，並抵觸該開關元件125。 該開關元件125包括一機械開關1251及一彈性元件 1252。該彈性元件1252覆蓋該機械開關1251。該彈性元 件1252同時抵觸該鍵墊123之觸動桿1232，使得在該鍵 7 200945863 情況Τ，_桿1232與該機械 ^ 1231 下移動並擠屋該彈性^曲，帶動該觸動桿1232 一併向 i25i。-曰朽_牛1252’進而觸動該機械開關 一該機械開關1251被觸動，產 訊號至該行動電爷彳少& A m序目應之顯不 Ο ❹ 進行相應之”路（圖匈。該行動電話1 • j裸作並由該顯示區域11進行顯示。 准該行動電話1之操作方式為按壓觸控 需頻繁按壓該鍵塾123進行操作，其容易導致使用^ = 疲勞^另外’頻繁物理按壓操作容易導致按鍵120磨損， 使得彈性元件1252老化、_桿1232與該機械_ ΐ25ι 對位不良，進而導致觸控失靈。 【發明内容】 有鑑於此，提供一種操作方便、觸控性能良好之 電話實為必要❶ 一種仃動電話，其包括一按鍵系統及一訊號處理系 統。該按鍵系統包括一導光介質、一光源及複數感光元件。 該導光介資疋義複數鍵盤區域，且包括相對設置之一第一 表面、一第二表面及一與該第一表面及該第二表面相鄰之 入光面。該光源鄰近該導光介質之入光面設置。該感光元 件分別鄰近該導光介質之第二表面設置，且對應該^光介 質之鍵盤區域。該感光元件感測該光源發出之光束，相應 產生一類比電訊號，並將該類比電訊號傳輸至該訊號處理 200945863 系統。 、一種行動電話，其包括複數鍵盤區域、—光源及複數 感光元件。該鍵盤區域包括相對之一第—表面、一第一 面及一侧面。該光源設置於該鍵盤區域之側面，用於 複數鍵盤區域提練定波長之光束。該心元件分別鄰近 該鍵盤區域設置，用於感測該鍵盤區域之該恆定波長之光 束，並相應產生一控制訊號。 純於先前技術，本發明行動電話藉由該感光元件感 測鍵盤區域之光源發出光束，對應產生一電訊號。該行動 電話根據該電訊號進行控制操作。該行動電話之控制操作 藉由感光元件及訊號處理系統來完成，無需外力按壓操 作’故其操作簡早方便，觸控性能良好。 【實施方式】 請參閱圖3,係本發明行動電話第一實施方式之示意 圖。該行動電話3包括一按鍵系統3丄、一訊號處理系統3 2 ❹及一顯示屏33。該按鍵系統31用於根據用戶指令產生觸 控訊號。該訊號處理系統32用於接收並處理該觸控訊號， 處理該觸控訊號，再進行相應之操作。該顯示屏33用於接 收來自該訊號處理系統32之顯示訊號並顯示操作晝面。 該按鍵系統31包括一光源311、一導光介質312、一 第一反射片313、一第二反射片314及複數感光元件315〇 該導光介質312包括相對設置之一第一表面3121、一第二 表面3122及一與該第一表面3121及該第二表面3122相鄰 之入光面3123。該導光介質312定義複數鍵盤區域（圖未 9 200945863 示），該鍵盤區域分別對應該行動電話3之複數鍵盤（圖未 示）之位置。該第一反射片313設置於該導光介質312之第 * 一表面3121。該第二反射片314設置於該導光介質312之 第二表面3122。該光源311鄰近該導光介質312之入光面 3123設置，用於產生恆定波長之紅外光束至該導光介質 312 ° 該第一反射片313包括複數第一開口 316。該第二反 射片314包括複數第二開口 317。每一第二開口 317對應 ® —第一開口 316，且該第一開口 316及該第二開口 317均 對應該導光介質312之鍵盤區域。該感光元件315鄰近該 第二反射片314之第二開口 317設置，用於感應由該第二 開口 317漏出之該恆定波長之紅外光，並根據該紅外光之 強度變化，產生一類比電壓訊號。該感光元件315只根據 該紅外光之強度之變化量產生類比電壓訊號，而對於保持 恆定值之該紅外光強度不作為，且對於其他波長之光亦不 作為。 ® 該訊號處理系統32包括一類比/數位轉換器321及一 微處理器322。該類比/數位轉換器321包括一輸入端3211 及一輸出端3212。該輸入端3211電連接至該感光元件 315。該輸出端3212電連接至該微處理器322。該類比/數 位轉換器321用於接收該感光元件315產生之類比電壓訊 號，將該類比電壓訊號轉換成數位電壓訊號，並將該數位 電壓訊號傳輸至該微處理器322。該微處理器322根據該 數位電壓訊號產生一對應之顯示訊號並進行相應之控制操 200945863 ‘作。該微處理器322同時將該顯示訊號傳輸至該顯示屏 33。該顯示屏33顯示操作界面。 該行動電話3之工作原理詳述如下： 該光源311發射恆定波長之紅外光至該導光介質 312。該光束於該導光介質312中傳播。大部份光束入射至 =第一反射片313或該第二反射片314後被反射回該導光 312’並繼續傳播。小部份光束自該第二反射片314 瘺之第二開口 317射出並被該感光元件315感測。該感光元 件315只根據該紅外光之強度之變化量產生類比電壓訊 號，而對於保持恆定值之該紅外光強度不作為。故，在無 外界條件作用之情境T，從該第二反射片314之該第二開 317射出之光束強度不改變，此時該感光元件不產 生類比電壓訊號。 當用戶觸摸該第一反射片313之一第一開口 316時， 由該，光介質312傳輸至該第一開口 316位置之光束入射 ❹至手私表面，其中部份光束被手指反射。該光束被反射回 該導光介質312，其根據反射之角度可劃分為二部份。其 /中一部份光束繼續於該導光介質312内傳。另一部份光束 從該第二反射片314之相對於該第-開口 316之第二開口 3一 17射出。因部份光束自該第二開口 μ?射出，導致該第 二開口 317對應區域之光束強度增加。故，設置於該第二 2 口 317附近之感光元件315所感應之光束強度增加。同 時該感光元件315對應產生一類比電壓訊號。 該類比電壓訊號傳輸至該類比/數位轉換器321，並藉 11 200945863 由該類比/數位轉換器321轉變為數位電壓訊號。該類比/ 數位轉換器321將該數位電壓訊號傳輸至該微處理器 322。該微處理器322根據該數位電壓訊號產生一對應之顯 示訊號並進行相應之控制操作。該微處理器322同時將該 顯示訊號傳輸至該顯示屏33。該顯示屏33顯示操作界面。 至此，該觸控操作完成。 該光源3U亦可發射其他怪定波長之光束，如惶定波 ❹ ❹ 長之可見光。該感光元件315感應該恆定波長之光束之強 度之變化，並相應產生類比電壓訊號。 π署先前技術，該行動電話3包括該導光介質312、 介質Μ入光面3123之光源311及複數感光 以牛315。該光源311發射^波長之 摸該導光介質312，入射至感井开“/:田用戶觸 ., 听王以元70件315之該恆定波長之 、工外光之強度發生改變。該感200945863 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a mobile phone. [Prior Art] The mobile phone has the advantages of convenient carrying and simple operation, and has been widely used as a personal mobile communication device. Referring to Fig. 1, a plan view of a prior art mobile phone is shown. The mobile phone 1 includes a display area 11 and a control area 12. ® This display area 11 is used to display various operation interfaces. The control area 12 includes a plurality of buttons 120. The user controls the mobile phone 1 by the button 120. Please refer to FIG. 2 together, which is a schematic diagram of the structure of the button 120 of the mobile phone 1. The button 120 includes a first substrate 121, a second substrate 122 disposed opposite to the first substrate 121, a key pad 123 disposed on a surface of the second substrate 122 away from the first substrate 121, and a plurality of settings The switch w element 125 of the first substrate 121 is adjacent to the surface of the second substrate 122. The second substrate 122 is provided with a plurality of openings 127. The opening 127 is correspondingly disposed at the position of the switching element 125. The key pad 123 includes an outwardly convex touch surface 1231 and a touch lever 1232 extending downward from the touch surface 1231. The touch rod 1232 passes through the opening 127 of the second substrate 122 and interferes with the switching element 125. The switching element 125 includes a mechanical switch 1251 and an elastic element 1252. The elastic member 1252 covers the mechanical switch 1251. The elastic member 1252 simultaneously interferes with the touch lever 1232 of the key pad 123, so that in the case of the key 7 200945863, the _ rod 1232 moves under the mechanical mechanism 1231 and squeezes the elastic curve, and the touch lever 1232 is driven together. I25i. - 曰 _ _ 牛 1252' and then touch the mechanical switch, the mechanical switch 1251 is touched, the signal to the action of the electric priest & A m order should be obvious ❹ 进行 carry out the corresponding "road (Figure Hungary. The mobile phone 1 is j-naked and displayed by the display area 11. The operation mode of the mobile phone 1 is that the pressing of the touch requires frequent pressing of the key 塾 123 for operation, which easily leads to the use of ^ = fatigue ^ additional 'frequent physics The pressing operation is likely to cause the button 120 to wear out, so that the elastic member 1252 is aged, the _ rod 1232 and the mechanical _ ΐ 25 ι are in poor alignment, and the touch failure is caused. [Invention] In view of the above, the present invention provides a convenient operation and good touch performance. The telephone is really necessary. A squeaking telephone includes a button system and a signal processing system. The button system includes a light guiding medium, a light source and a plurality of photosensitive elements. The light guiding medium includes a plurality of keyboard areas, and includes a first surface, a second surface, and a light incident surface adjacent to the first surface and the second surface are disposed opposite to each other. The light source is adjacent to the light incident surface of the light guiding medium The photosensitive elements are respectively disposed adjacent to the second surface of the light guiding medium and correspond to a keyboard area of the optical medium. The photosensitive element senses a light beam emitted by the light source, correspondingly generates an analog signal, and the analogy is telecommunication. The signal is transmitted to the signal processing 200945863 system. A mobile phone includes a plurality of keyboard areas, a light source and a plurality of photosensitive elements. The keyboard area includes a first surface, a first surface and a side surface. The side of the keyboard area is used for refining a predetermined wavelength beam in the plurality of keyboard areas. The core elements are respectively disposed adjacent to the keyboard area for sensing the constant wavelength beam of the keyboard area, and correspondingly generating a control signal. In the prior art, the mobile phone of the present invention emits a light beam by sensing the light source of the keyboard area, and correspondingly generates a signal. The mobile phone performs a control operation according to the electric signal. The control operation of the mobile phone is performed by the photosensitive element and The signal processing system is completed, no external force pressing operation is required, so the operation is simple and convenient, and the touch is convenient. [Embodiment] Please refer to Fig. 3, which is a schematic diagram of a first embodiment of a mobile phone according to the present invention. The mobile phone 3 includes a button system 3A, a signal processing system 3 2 ❹ and a display screen 33. The system 31 is configured to generate a touch signal according to a user command. The signal processing system 32 is configured to receive and process the touch signal, process the touch signal, and perform corresponding operations. The display screen 33 is configured to receive the signal from the signal processing. The display system 31 includes a light source 311, a light guiding medium 312, a first reflecting sheet 313, a second reflecting sheet 314, and a plurality of photosensitive elements 315. The light guiding medium 312. The first surface 3121, the second surface 3122, and a light incident surface 3123 adjacent to the first surface 3121 and the second surface 3122 are disposed opposite to each other. The light guiding medium 312 defines a plurality of keyboard areas (not shown in Fig. 9 200945863), and the keyboard areas respectively correspond to the positions of the plurality of keyboards (not shown) of the mobile phone 3. The first reflective sheet 313 is disposed on the first surface 3121 of the light guiding medium 312. The second reflective sheet 314 is disposed on the second surface 3122 of the light guiding medium 312. The light source 311 is disposed adjacent to the light incident surface 3123 of the light guiding medium 312 for generating a constant wavelength infrared light beam to the light guiding medium 312. The first reflective sheet 313 includes a plurality of first openings 316. The second reflector 314 includes a plurality of second openings 317. Each of the second openings 317 corresponds to the first opening 316, and the first opening 316 and the second opening 317 correspond to the keyboard area of the light guiding medium 312. The photosensitive element 315 is disposed adjacent to the second opening 317 of the second reflective sheet 314 for sensing the constant wavelength infrared light leaking from the second opening 317, and generates an analog voltage signal according to the intensity change of the infrared light. . The photosensitive element 315 generates an analog voltage signal only based on the amount of change in the intensity of the infrared light, and does not act on the intensity of the infrared light that maintains a constant value, and does not act on light of other wavelengths. The signal processing system 32 includes an analog/digital converter 321 and a microprocessor 322. The analog/digital converter 321 includes an input 3211 and an output 3212. The input terminal 3211 is electrically coupled to the photosensitive element 315. The output 3212 is electrically coupled to the microprocessor 322. The analog/digital converter 321 is configured to receive an analog voltage signal generated by the photosensitive element 315, convert the analog voltage signal into a digital voltage signal, and transmit the digital voltage signal to the microprocessor 322. The microprocessor 322 generates a corresponding display signal according to the digital voltage signal and performs corresponding control operations. The microprocessor 322 simultaneously transmits the display signal to the display screen 33. The display screen 33 displays an operation interface. The principle of operation of the mobile telephone 3 is detailed as follows: The light source 311 emits infrared light of a constant wavelength to the light guiding medium 312. The light beam propagates in the light guiding medium 312. Most of the light beam is incident on the first reflective sheet 313 or the second reflective sheet 314 and is reflected back to the light guide 312' and continues to propagate. A small portion of the light beam is emitted from the second opening 317 of the second reflection sheet 314 and is sensed by the photosensitive member 315. The photosensitive element 315 generates an analog voltage signal only based on the amount of change in the intensity of the infrared light, and does not act on the intensity of the infrared light that maintains a constant value. Therefore, in the situation T without external conditions, the intensity of the beam emitted from the second opening 317 of the second reflection sheet 314 does not change, and the photosensitive element does not generate an analog voltage signal. When the user touches the first opening 316 of the first reflection sheet 313, the light beam transmitted from the optical medium 312 to the position of the first opening 316 is incident on the surface of the hand surface, and a part of the light beam is reflected by the finger. The beam is reflected back to the light guiding medium 312, which can be divided into two parts depending on the angle of reflection. A / part of the beam continues in the light guiding medium 312. Another portion of the light beam is emitted from the second opening 3-17 of the second reflection sheet 314 with respect to the first opening 316. Since a part of the light beam is emitted from the second opening μ?, the beam intensity of the corresponding area of the second opening 317 is increased. Therefore, the intensity of the light beam induced by the photosensitive element 315 disposed near the second port 317 increases. At the same time, the photosensitive element 315 correspondingly generates an analog voltage signal. The analog voltage signal is transmitted to the analog/digital converter 321 and converted to a digital voltage signal by the analog/digital converter 321 by 11 200945863. The analog/digital converter 321 transmits the digital voltage signal to the microprocessor 322. The microprocessor 322 generates a corresponding display signal based on the digital voltage signal and performs corresponding control operations. The microprocessor 322 simultaneously transmits the display signal to the display screen 33. The display screen 33 displays an operation interface. At this point, the touch operation is completed. The light source 3U can also emit light beams of other strange wavelengths, such as visible light having a long wavelength. The photosensitive element 315 senses the change in intensity of the beam of constant wavelength and produces an analog voltage signal accordingly. According to the prior art, the mobile phone 3 includes the light guiding medium 312, the light source 311 of the medium entering the light surface 3123, and the plurality of photosensitive 315. The light source 311 emits the wavelength of the light guiding medium 312, and is incident on the well-sensing "/: the user touches the room. Listening to the constant wavelength of the 70-piece 315 of Wang Yiyuan, the intensity of the external light changes.
Mr ^ ^ 先兀件315偵測該光強度之 變置’產生一訊號。該行動雷抱μ吟 ^ 之控制操作及顯示操作。根據該訊號進行相應 該按鍵系統31進行頻繁：按壓電：3之觸控操作無需對 單方便。且叙發繁 該按鍵系統31操作簡 更且該仃動電話3之觸把極於组山 應對應之光強變化量來1觸^作藉由感光元件315感 操作。 疋成，故其靈敏度高，不易產生誤 請參閲圖4,係本發明 意圖。該行動電話4與第_實施古：之第-實鉍方式之不 同，1主& 實施方式之行動電話3大致相 门第、主要Q別在於:其按鍵系 -第-吸收臈413、—第 '導先介質412 及收膜414、一光源411及複數 12 200945863 感光元件415。該導光介質412包括相對設置之一第一表 面4121、一第二表面4122及一與該第一表面4121及該第 ' 二表面4122相鄰之入光面4123。該光源411相對該導光 介質412之入光面4123設置。該第一吸收膜413設置於該 導光介質412之第一表面4121，且位於靠近該光源411之 區域。該第二吸收膜414設置於該導光介質412之第二表 面4122，且位於靠近該光源411之區域。 該光源411用於發射具有恆定波長之紅外光至該導光 ❹介質412。該第一吸收膜413及該第二吸收膜414用於吸 收該導光介質412内不能發生全反射之紅外光，使得該導 光介質412内之光束均在該第一表面4121及該第二表面 4122發生全反射。該感光元件415設置於該導光介質412 之第二表面4122，用於感測該恆定波長之紅外光，一旦偵 測到該光束，即產生一類比電壓訊號。 該光源411發出之光束入射至該導光介質412中，其 中，大部份光束於該導光介質412内反復全反射，小部份 ® 光束折射出該導光介質412並被該第一吸收膜413及該第 二吸收膜414吸收。故，該導光介質412内之光束均發生 全反射，當用戶未觸控該按鍵系統41時，該感光元件415 未偵測到該恆定波長之光束，故不作為。當用戶用手指觸 摸該導光介質412時，手指相對於空氣屬於光密介質，導 致入射至該導光介質412處之光束部份折射，部份則反射 至下表面並折射至該感光元件415。該感光元件415感測 該恆定波長之光束，產生一類比電壓訊號，並將該類比電 13 200945863 壓訊號傳輸至一訊號處理系統42。該訊號處理系統42根 據該數位電壓訊號產生一對應之顯示訊號並進行相應之操 作。該訊號處理系統42同時將該顯示訊號傳輸至一顯示^ 43。該顯示屏43顯示操作界面。 相較於先前技術，該行動電話4之第一吸收膜413及 第二吸收膜414使得入射光束均在該導光介質412内全反 射，此時該光感元件415感測不到該光束。一旦用戶觸摸 該導光介質412之鍵盤區域，則光束於觸摸處發生反射及 ®折射，該部份折射光束入射至該感光元件415，該感光元 件415偵測該光束’產生一訊號，使得該行動電話4實現 控制及顯示操作。該行動電話4之觸控操作藉由該感光元 件感應對應之光束來完成’其靈敏度高，不易產生誤操作。 本發明之行動電話不限於上述實施方式所述，亦可具 其他變更設計，如：該感光元件315可根據該恆定波長之 紅外光之強度變化產生一類比電流訊號，並將該類比電流 訊號傳輸至該訊號處理系統32進行相應操作。該感光元件 415可根據感測到之該丨亙定波長之紅外光產生一類比電流 訊號，並將該類比電流訊號傳輸至該訊號處理系統42進行 相應操作。 綜上所述’本發明確已符合發明之要件，爰依法提出 專利申請。惟’以上所述者僅為本發明之較佳實施方式， 本發明之範圍並不以上述實施方式為限，舉凡熟悉本案技 藝之人士援依本發明之精神所作之等效修飾或變化，皆應 涵蓋於以下申請專利範圍内。 200945863 【圖式簡單說明】 圖1係一種先前技術行動電話之平面示意圖。 圖2係圖1所示行動電話之按鍵結構示意圖。 圖3係本發明行動電話第一實施方式之示意圖。 圖4係本發明行動電話第二實施方式之示意圖。 【主要元件符號說明】 行動電話 3 ' 4 第一開口 316 按鍵系統 31、41 第二開口 317 光源 311 、 411 類比/數位轉換器 321 導光介質 312、412 輸入端 3211 第一表面 3121 、 4121 輸出端 3212 第二表面 3122 > 4122 微處理器 322 入光面 3123 、 4123 訊號處理系統 32、42 第一反射片 313 顯示屏 33、43 第二反射片 314 第一吸收膜 413 感光元件 315 、 415 第二吸收膜 414 ❹ 15The Mr ^ ^ pre-conditioner 315 detects the change in the intensity of the light' to generate a signal. This action is controlled by the control operation and display operation. According to the signal, the button system 31 performs frequent: pressing: 3 touch operation is not convenient. Moreover, the button system 31 is simple in operation and the touch pad of the swaying phone 3 is operated by the photosensitive member 315 in response to the change in the intensity of the corresponding light. The sensitivity is high and it is not easy to cause errors. Please refer to Fig. 4 for the purpose of the present invention. The mobile phone 4 is different from the first embodiment of the mobile phone 3, and the mobile phone 3 of the main & embodiment is substantially the same as the main one, and the main key is: the button system - the first absorption 413, - The first guiding medium 412 and the film 414, a light source 411 and a plurality of 12, 2009, 863 photosensitive elements 415. The light guiding medium 412 includes a first surface 4121, a second surface 4122, and a light incident surface 4123 adjacent to the first surface 4121 and the second surface 4122. The light source 411 is disposed relative to the light incident surface 4123 of the light guiding medium 412. The first absorbing film 413 is disposed on the first surface 4121 of the light guiding medium 412 and located in a region close to the light source 411. The second absorbing film 414 is disposed on the second surface 4122 of the light guiding medium 412 and located in a region close to the light source 411. The light source 411 is for emitting infrared light having a constant wavelength to the light guiding medium 412. The first absorbing film 413 and the second absorbing film 414 are configured to absorb infrared light that cannot be totally reflected in the light guiding medium 412, so that the light beams in the light guiding medium 412 are on the first surface 4121 and the second Surface 4122 is totally reflected. The photosensitive element 415 is disposed on the second surface 4122 of the light guiding medium 412 for sensing the infrared light of the constant wavelength. Once the light beam is detected, an analog voltage signal is generated. The light beam emitted by the light source 411 is incident on the light guiding medium 412, wherein a majority of the light beam is repeatedly totally reflected in the light guiding medium 412, and a small portion of the light beam is reflected by the light guiding medium 412 and is absorbed by the first light. The film 413 and the second absorption film 414 are absorbed. Therefore, the light beam in the light guiding medium 412 is totally reflected. When the user does not touch the button system 41, the photosensitive element 415 does not detect the beam of the constant wavelength, and therefore does not act. When the user touches the light guiding medium 412 with a finger, the finger belongs to the optically dense medium with respect to the air, so that the light beam incident on the light guiding medium 412 is partially refracted, and the portion is reflected to the lower surface and refracted to the photosensitive element 415. . The photosensitive element 415 senses the beam of constant wavelength, generates an analog voltage signal, and transmits the analog signal to the signal processing system 42. The signal processing system 42 generates a corresponding display signal based on the digital voltage signal and performs corresponding operations. The signal processing system 42 simultaneously transmits the display signal to a display 43. The display screen 43 displays an operation interface. Compared with the prior art, the first absorption film 413 and the second absorption film 414 of the mobile phone 4 cause the incident light beam to be totally reflected in the light guiding medium 412, and the light sensing element 415 does not sense the light beam. Once the user touches the keyboard area of the light guiding medium 412, the light beam is reflected and refracted at the touch, and the partially refracted light beam is incident on the photosensitive element 415, and the photosensitive element 415 detects the light beam to generate a signal, so that the light source The mobile phone 4 implements control and display operations. The touch operation of the mobile phone 4 is accomplished by sensing the corresponding light beam by the photosensitive element. The sensitivity is high and the misoperation is not easy. The mobile phone of the present invention is not limited to the above embodiment, and may have other modified designs. For example, the photosensitive element 315 may generate an analog current signal according to the intensity change of the constant wavelength infrared light, and transmit the analog current signal. The signal processing system 32 is operated accordingly. The photosensitive element 415 can generate an analog current signal according to the sensed wavelength of the infrared light, and transmit the analog current signal to the signal processing system 42 for corresponding operation. In summary, the present invention has indeed met the requirements of the invention and has filed a patent application in accordance with the law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. 200945863 [Simplified description of the drawings] Fig. 1 is a schematic plan view of a prior art mobile phone. FIG. 2 is a schematic diagram showing the structure of a button of the mobile phone shown in FIG. 1. 3 is a schematic diagram of a first embodiment of a mobile phone of the present invention. Figure 4 is a schematic illustration of a second embodiment of a mobile telephone of the present invention. [Description of main component symbols] Mobile phone 3' 4 First opening 316 Key system 31, 41 Second opening 317 Light source 311, 411 Analog/digital converter 321 Light guiding medium 312, 412 Input 3211 First surface 3121, 4121 Output End 3212 second surface 3122 > 4122 microprocessor 322 light incident surface 3123, 4123 signal processing system 32, 42 first reflective sheet 313 display screen 33, 43 second reflective sheet 314 first absorption film 413 photosensitive elements 315, 415 Second absorption film 414 ❹ 15