200826714 ' Λ 九、發明說明： 【發明所屬之技術領域】 本發明係涉及一種移動電子設備，尤係涉及一種 移動電子設備之音箱結構。 【先前技術】 隨著資訊産業之快速發展，移動電子設備比如移 動電話之需求量大增，移動電話作爲人們之通訊工 f 具，其最基本之功能係傳輸聲音信號，爲傳輸聲音信 I 號，需採用電聲轉換元件將聲音信號轉換爲電訊號， 或者將電訊號轉換爲結構振動以産生聲音，其中最爲 廣泛適用之揚聲器即係用來將電訊號轉換爲結構振 動以産生聲音。 移動電話之發聲品質除了與揚聲器本身有關之 外，與設於揚聲器外之音箱結構亦極爲相關，移動電 話之音箱結構中音腔腔體之體積越大，其腔體内之空 ( 氣對揚聲器發出之聲音的阻尼作用亦越小，這樣可降 低揚聲器之最低諧振頻率，從而可達到較好之低頻響 應效果以提升移動電話之發聲品質，然而音腔腔體之 體積增加亦相應地使移動電話之體積增大，這顯然與 移動電話向短小輕薄之方向發展之趨勢相違背，故如 何在提升移動電話之發聲品質之同時又不增加其體 積與大小已顯得至關重要。 【發明内容】 200826714 有蓥於此，有必要提供一種具有提升發聲品質之 音箱結構及採用該音箱結構之移動電子設備。 一種音箱結構，包括腔體及置於該腔體内之揚聲 器，該腔體内形成有第一音腔、第二音腔及第三音 腔，該第一音腔包括前音腔及收容該揚聲器之後音 腔，該後音腔與第二音腔連通以形成一後音響室，該 前音腔與第三音腔連通以形成一前音響室。 一種移動電子設備，包括一殼體，該殼體内設有 音箱結構及内藏式天線，該音箱結構包括腔體、置於 該腔體内之揚聲器及與揚聲器電連接之電路板，該電 路板與内藏式天線分別設於該腔體之兩侧，該腔體内 形成有第一音腔、第二音腔及第三音腔，該第一音腔 包括前音腔及收容該揚聲器之後音腔，該後音腔與第 二音腔連通以形成一後音響室，該前音腔與第三音腔 連通以形成一前音響室。 與習知技術相比，上述音箱結構中形成相互獨立 之前、後音響室結構，揚聲器發出之聲信號分別進入 該前、後音響室産生共振，不僅形成移動電話之特有 共振效應’而且退使音箱結構中之體積得到充分之利 用，在不增加移動電話之體積與大小之前提下，最大 限度地擴大腔體之體積，從而降低揚聲器之最低諧振 頻率，改善揚聲器之低頻響應效果，進而提升移動電 話之發聲品質。 【實施方式】 7 200826714 圖1所示爲本發明移動電子設備之其中一實施例 中以移動電話1爲例之結構示意圖，該移動電話1包括 一殼體10，該殼體10爲一大致呈長方體狀之結構，該 殼體10之底部區域形成一按鍵區11，中央區域形成一 顯示區12，頂端則形成一發聲區13，該殼體10之内部 設有音箱結構20及内藏式天線29 (請參照圖2)，該音 箱結構20對應移動電話1之發聲區13設置。該移動電 子設備除了爲移動電話1之外，還可爲個人數位助理 [ (PDA)等其他需内置音箱結構20之移動電子設備。 如圖2至圖5所示，該音箱結構20包括一腔體21、 置於該腔體21内之一揚聲器25、設於該腔體21—侧之 一電路板28及夾設於該腔體21與電路板28間之一框 體27，該内藏式天線29設於腔體21之另一側。 該内藏式天線29包括一板狀之本體290及由該本 體290之邊緣向腔體21延伸形成之兩卡扣臂298，每一 卡扣臂298之末端設有一凸點291，用於將天線29與電 / v 路板28電連接，該本體290上設有複數定位孔299，以 用於將天線29定位於該腔體21上。 該揚聲器25收容於該腔體21内，該揚聲器25靠近 内藏式天線29之一面上設有複數前出音孔251 (請參 照圖3)，與該面相對之另一面上設有複數後出音孔 252，該揚聲器25電連接至電路板28，用於將電路板 28輸入之電訊號轉化爲聲訊號，並藉由前出音孔251 及後出音孔252傳出，該揚聲器25側面上設有一凸耳 8 200826714 250 ’以將該揚聲器25定位於該腔體21内。 該腔體21爲一半封閉之殼體，其由底板211 (請參 照圖3)與側板212合圍形成並於該半封閉之殼體内形 成一收容空間，該收容空間内設有由底板2n向半封閉 之殼體開放之一側延伸的一環牆221，該環牆221爲筒 狀，其内形成一收容揚聲器25之第一音腔22〇，該收 谷空間内還設有將環牆221與腔體21之侧板212連接 之兩隔板231，以於該第一音腔22〇外圍與腔體21之側 ί 板212之間形成一第二音腔230及一第三音腔240，當 然’當該環牆221之一部分與腔體21之側板212接觸 時，則只需一隔板即可將第一音腔22〇之外圍分成兩 腔體。 該第一音腔220之環牆221對應第二音腔230與第 三音腔240之部分分別爲第一相交壁233與第二相交 壁232，該第二相交壁232及兩隔板212之頂面與該腔 體21之侧板212之頂面共面，在垂直於腔體21之底板 { 一 211之方向上，該第一相交壁233之頂面低於第二相交 壁232之頂面，即該第一相交壁233之頂面與第二相交 壁232之頂面間存在高度差，由此該第一音腔220與第 二音腔230連通。 該第一音腔220之環牆221之底側即靠近底板211 之一側凸設有一環狀之凸緣222，該凸緣222將第一音 腔220分爲一前音腔223及一後音腔224，該前音腔223 之内壁即該凸緣222之内緣上於第二相交壁232處設 9 200826714 有一出音孔225，從而將前音腔223與第三音腔240連 通。該後音腔224用於收容揚聲器25，該後音腔224對 應於第二音腔230之第一相交壁233上設有一凹槽 226 ’該凹槽226與揚聲器25側壁上之凸耳250相配 合，以將該揚聲器25定位於後音腔224内，該揚聲器 25之前出音孔251對應該前音腔223，而其後出音孔 252則對應該後音腔224。該揚聲器25置於該後腔體 224内後，前音腔223與後音腔224相互隔開，從而使 後音腔224與第二音腔230共同形成一後音響室，而前 音腔223則與第三音腔240共同形成一前音響室，且所 述前、後音響室相互獨立。 該腔體21之側板212對應該第三音腔240之位置 設有一通音孔227,以將該前音腔223與第三音腔240 所形成之前音響室與外界環境連通。該腔體21之底板 211上靠近侧板212之位置設有一貫穿腔體21之底板 211之固定孔228,該固定孔228大致呈方形，其周緣向 上延伸形成一方形壁235，該方形壁235之頂面與腔體 21之侧板212之頂面共面，該内藏式天線29之兩卡扣 臂298可卡制於該方形壁235内，該腔體21之底板211 朝向内藏式天線29凸設有複數凸柱229 (請參照圖 3 )’該等凸柱229與内藏式天線29上之定位孔299配 合’以將内藏式天線29固定於該腔體21之底板211上。 該框體27係由橡膠、玻璃纖維布等制振材料製 成，該框體27設於該腔體21與該底板211相對之一開放 200826714 式之壁面上，並夾設於該腔體21與電路板28之間。 該框體27包括一外框271及設於該外框271内之 一第一内框272及一第二内框273，該外框271之形狀 與腔體21之外圍形狀大致相同，該第一内框272貼設 於該腔體21之固定孔228之方形壁235上，其與外框 271合圍形成與該固定孔228對應之一第一空間274， 該第二内框273貼設於該腔體21之隔板231與第二相 交壁232上，其與外框271合圍形成與該第三音腔240 C 對應之一第二空間276，而該第一内框272、第二内框 273與外框271共同圍設形成一第三空間275，該第三 空間275對應於由第一音腔220之後音腔224與第二音 腔230共同形成之後音響室，該第三空間275可使該後 音響室之體積擴大，而該第二空間276可使由第一音 腔220腔體之前音腔223與第三音腔240共同形成之前 音響室之體積擴大。 該框體27之外框271、第一内框272與第二内框 £ i 273之尺寸需進行合理設計，以盡可能地增大該第二 空間276與第三空間275，並使該框體27不會因爲其外 框271、第一内框272與第二内框273之尺寸過小而影 響其制振效果。 組裝時，該揚聲器21置於該腔體21之後音腔224 内，其前出音孔251對應該腔體21之前音腔223，而其 後出音孔252則對應該後音腔224，·該電路板烈設於該 腔體21開放之一側；該框體27夾設於該電路板28與腔 11 200826714 體21之間，該框體27與該電路板28及腔體21之接觸處 可利用粘合劑（圖未示）進行充分填充粘合，且該框 體27亦可填補該電路板28與腔體21間之空隙，從而使 該前、後音響室分別形成各自相互獨立之相對密閉之 空間；該内藏式天線29貼設於腔體21之底板211上，其 上之定位孔299與腔體21之底板211上之凸柱229配 合，兩卡扣臂298穿過腔體21之固定孔228並利用卡扣 臂298向外之張力與方形壁235卡合，兩卡扣臂298之 末端穿過框體27之第一空間274，從而使卡扣臂298上 之凸點291與電路板28連接。 上述音箱結構20中形成相互獨立之前音響室（前 音腔223及第三音腔240)及後音響室（後音腔224及 第二音腔230)結構，揚聲器25由前出音孔251及後出 音孔252發出聲信號，分別進入該前音響室及後音響 室産生共振，並藉由腔體21之側板212上之通音孔227 傳送至外界，這樣一方面可使音箱結構20中之體積得 到充分之利用，在不增加移動電話1之體積與大小之 命Φξΐ下’袁大地擴大腔體21之體積’從而降低揚聲器 25之最低諧振頻率，改善揚聲器25之低頻響應效果， 進而提升移動電話1之發聲品質，另一方面可形成移 動電話1之特有共振效應，根據聲-振分析軟體 SYSNOISE類比可得出，上述音箱結構20之前、後音 響室之響應頻率分別在2941Hz、3851Hz左右，採用該 種音箱結構20之移動電話1之聲音響度適當並趨於穩 12 200826714 定，且可避免鈐聲尖銳化或破音現象之發生，可提升 聲音之質感與豐富感，從而獲得良好之發聲品質。 另外，上述音箱結構20中由於夾設了框體27，使 該前、後音響室分別形成爲相對密閉之空間，可防止 音箱結構20漏出聲波，避免該漏出之聲波與音箱結構 20由腔體21之側板212之通音孔227發出之直達波産 生干涉，可使聲音之頻率特性趨於穩定，提升移動電 話1之發聲品質；同時，該框體27由制振材料製成， g 可降低由於揚聲器25之發聲所引起之揚聲器25與電 路板28間共振之傳遞，從而可避免聲音受到干擾。 再者，上述音箱結構20中由於内藏式天線29與電 路板28分設於腔體21之兩側，不僅可充分利用空間， 實現良好之低頻響應效果，還可防止内藏式天線29與 電路板28發生電磁干擾，從而獲得良好之通話品質。 綜上所述，本發明符合發明專利之要件，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 " 例，舉凡熟悉本案技藝之人士，在爰依本發明精神所 作之等效修飾或變化，皆應涵蓋於以下之申請專利範 圍内。 【圖式簡單說明】 圖1爲本發明移動電子設備（以移動電話爲例）其 中一實施例之結構示意圖。 圖2爲圖1移動電話内之音箱結構與内藏式天線 第一視角之立體分解圖。 13 200826714 圖3爲圖2所示音箱結構與内藏式天線第二視角 之立體分解圖。 圖4爲圖2所示音箱結構中之腔體之結構示意圖。 圖5爲圖2所示音箱結構與内藏式天線之部分組 裝圖。 【主要元件符號說明】 移動電話 1 殼體 10 按鍵區 11 顯不區 12 發聲區 13 音箱結構 20 腔體 21 底板 211 側板 212 第一音腔 220 環牆 221 凸緣 222 前音腔 223 後音腔 224 出音孔 225 凹槽 226 通音孔 227 固定孔 228 凸柱 229 第二音腔 230 隔板 231 第二相交壁 232 第一相交壁 233 方形壁 235 第三音腔 240 揚聲器 25 凸耳 250 前出音孔 251 後出音孔 252 框體 27 外框 271 第一内框 272 第二内框 273 第一空間 274 第三空間 275 第二空間 276 14 200826714 電路板 28 内藏式天線 29 本體 290 凸點 291 卡扣臂 298 定位孔 299 f 15200826714 ' 发明 Nine, invention description: [Technical Field] The present invention relates to a mobile electronic device, and more particularly to a speaker structure of a mobile electronic device. [Prior Art] With the rapid development of the information industry, the demand for mobile electronic devices such as mobile phones has increased greatly. Mobile phones are used as communication devices for people. The most basic function is to transmit sound signals for transmitting voice signals. The electro-acoustic conversion component is used to convert the sound signal into an electrical signal, or the electrical signal is converted into a structural vibration to generate sound. The most widely used speaker is used to convert the electrical signal into structural vibration to generate sound. The sound quality of the mobile phone is not only related to the speaker itself, but also related to the structure of the speaker set outside the speaker. The larger the volume of the sound cavity in the speaker structure of the mobile phone, the space inside the cavity (air to speaker) The smaller the damping effect of the emitted sound, the lower the resonant frequency of the speaker, so that a better low-frequency response can be achieved to improve the sound quality of the mobile phone. However, the volume of the cavity is increased accordingly. The increase in volume is obviously contrary to the trend of mobile phones in the direction of short and light, so how to improve the sound quality of mobile phones without increasing their size and size has become very important. [Summary of Contents] 200826714 In view of this, it is necessary to provide a speaker structure with improved sound quality and a mobile electronic device using the speaker structure. A speaker structure comprising a cavity and a speaker disposed in the cavity, the cavity is formed in the cavity a sound chamber, a second sound chamber and a third sound chamber, the first sound chamber comprising a front sound chamber and receiving the speaker a rear sound chamber, the rear sound chamber is in communication with the second sound chamber to form a rear sound chamber, the front sound chamber is in communication with the third sound chamber to form a front sound chamber. A mobile electronic device comprising a housing, the shell The speaker body structure and the built-in antenna are arranged in the body, the speaker structure comprises a cavity, a speaker disposed in the cavity body and a circuit board electrically connected to the speaker, wherein the circuit board and the built-in antenna are respectively disposed in the cavity On both sides, a first sound chamber, a second sound chamber and a third sound chamber are formed in the cavity, the first sound chamber includes a front sound chamber and a sound chamber after receiving the speaker, the rear sound chamber and the second sound chamber The chambers are connected to form a rear acoustic chamber, and the front sound chamber communicates with the third sound chamber to form a front sound chamber. Compared with the prior art, the speaker structure is formed separately from each other before and after the sound chamber structure, and the speaker emits The acoustic signals enter the front and rear sound chambers to generate resonance, which not only forms the unique resonance effect of the mobile phone, but also makes the volume in the speaker structure fully utilized, and the maximum is not increased before the volume and size of the mobile phone are increased. The volume of the cavity is enlarged to reduce the minimum resonant frequency of the speaker, and the low-frequency response of the speaker is improved, thereby improving the sound quality of the mobile phone. [Embodiment] 7 200826714 FIG. 1 shows one of the mobile electronic devices of the present invention. In the embodiment, the mobile phone 1 is taken as an example. The mobile phone 1 includes a casing 10. The casing 10 has a substantially rectangular parallelepiped structure. The bottom portion of the casing 10 defines a button area 11 and a center. The area forms a display area 12, and the top end forms a sound emitting area 13. The inside of the housing 10 is provided with a speaker structure 20 and a built-in antenna 29 (please refer to FIG. 2), and the speaker structure 20 corresponds to the sounding area of the mobile phone 1. 13: In addition to the mobile phone 1, the mobile electronic device can also be a personal digital assistant ([PDA) and other mobile electronic devices that require a built-in speaker structure 20. As shown in FIG. 2 to FIG. 5, the speaker structure 20 includes a cavity 21, a speaker 25 disposed in the cavity 21, and a circuit board 28 disposed on the side of the cavity 21 and sandwiched therebetween. A frame 27 is formed between the body 21 and the circuit board 28, and the built-in antenna 29 is disposed on the other side of the cavity 21. The built-in antenna 29 includes a plate-shaped body 290 and two latching arms 298 extending from the edge of the body 290 toward the cavity 21. Each of the latching arms 298 is provided with a bump 291 at the end for The antenna 29 is electrically connected to the electrical/v-path board 28, and the body 290 is provided with a plurality of positioning holes 299 for positioning the antenna 29 on the cavity 21. The speaker 25 is received in the cavity 21, and the speaker 25 is provided with a plurality of front sound-emitting holes 251 on one surface of the built-in antenna 29 (please refer to FIG. 3), and the other side opposite to the surface is provided with plural numbers. The sound hole 252 is electrically connected to the circuit board 28 for converting the electrical signal input by the circuit board 28 into an audio signal, and is transmitted through the front sound hole 251 and the rear sound hole 252. The speaker 25 is outputted. A lug 8 200826714 250 ' is provided on the side to position the speaker 25 within the cavity 21. The cavity 21 is a half-closed casing formed by the bottom plate 211 (please refer to FIG. 3) and the side plate 212, and a receiving space is formed in the semi-closed casing. The receiving space is provided with a bottom plate 2n. A ring wall 221 extending from one side of the semi-closed casing is open, and the ring wall 221 is cylindrical, and a first sound chamber 22 is received therein for receiving the speaker 25. The ring wall is also provided with a ring wall 221 Two partitions 231 connected to the side plates 212 of the cavity 21 to form a second sound chamber 230 and a third sound chamber 240 between the periphery of the first sound chamber 22 and the side plate 212 of the cavity 21 Of course, when one portion of the annular wall 221 is in contact with the side plate 212 of the cavity 21, the periphery of the first acoustic cavity 22 can be divided into two cavities by only one partition. The portion of the ring wall 221 of the first sound chamber 220 corresponding to the second sound chamber 230 and the third sound chamber 240 is a first intersecting wall 233 and a second intersecting wall 232, respectively, and the second intersecting wall 232 and the two partitions 212 The top surface is coplanar with the top surface of the side plate 212 of the cavity 21, and the top surface of the first intersecting wall 233 is lower than the top of the second intersecting wall 232 in a direction perpendicular to the bottom plate {211 of the cavity 21. The surface, that is, the top surface of the first intersecting wall 233 and the top surface of the second intersecting wall 232 have a height difference, whereby the first sound chamber 220 is in communication with the second sound chamber 230. An annular flange 222 is protruded from a side of the bottom wall 221 of the first sound chamber 220, that is, a side of the bottom plate 211. The flange 222 divides the first sound chamber 220 into a front sound chamber 223 and a rear portion. The sound chamber 224, the inner wall of the front sound chamber 223, that is, the inner edge of the flange 222, is disposed at the second intersecting wall 232. 9 200826714 has a sound hole 225, thereby connecting the front sound chamber 223 with the third sound chamber 240. The rear sound chamber 224 is configured to receive the speaker 25, and the rear sound chamber 224 is provided with a recess 226 corresponding to the first intersecting wall 233 of the second sound chamber 230. The recess 226 is opposite to the lug 250 on the side wall of the speaker 25. Cooperating to position the speaker 25 in the rear sound chamber 224, the sound hole 251 of the speaker 25 corresponds to the front sound chamber 223, and the sound hole 252 thereafter corresponds to the rear sound chamber 224. After the speaker 25 is placed in the rear cavity 224, the front sound chamber 223 and the rear sound chamber 224 are spaced apart from each other, so that the rear sound chamber 224 and the second sound chamber 230 together form a rear sound chamber, and the front sound chamber 223 Then, together with the third sound chamber 240, a front sound chamber is formed, and the front and rear sound chambers are independent of each other. The side plate 212 of the cavity 21 is provided with a sound hole 227 corresponding to the position of the third sound chamber 240 to communicate the front sound chamber 223 and the front sound chamber formed by the third sound chamber 240 with the external environment. A fixing hole 228 is formed in the bottom plate 211 of the cavity 21 adjacent to the side plate 212. The fixing hole 228 is substantially square, and a peripheral edge thereof extends upward to form a square wall 235. The square wall 235 The top surface of the cavity 21 is coplanar with the top surface of the side plate 212 of the cavity 21. The two latching arms 298 of the built-in antenna 29 can be locked in the square wall 235. The bottom plate 211 of the cavity 21 faces the built-in type. The antenna 29 is convexly provided with a plurality of protrusions 229 (please refer to FIG. 3). The posts 229 are engaged with the positioning holes 299 of the built-in antenna 29 to fix the built-in antenna 29 to the bottom plate 211 of the cavity 21. on. The frame body 27 is made of a vibration-damping material such as rubber or fiberglass cloth. The frame body 27 is disposed on a wall surface of the cavity 21 opposite to the bottom plate 211 and is open to the cavity 21 Between the circuit board 28. The frame body 27 includes an outer frame 271 and a first inner frame 272 and a second inner frame 273 disposed in the outer frame 271. The shape of the outer frame 271 is substantially the same as the outer shape of the cavity 21. An inner frame 272 is attached to the square wall 235 of the fixing hole 228 of the cavity 21, and is surrounded by the outer frame 271 to form a first space 274 corresponding to the fixing hole 228. The second inner frame 273 is attached to the first frame 273. The partition 231 of the cavity 21 and the second intersecting wall 232 are surrounded by the outer frame 271 to form a second space 276 corresponding to the third sound chamber 240 C, and the first inner frame 272 and the second inner portion The frame 273 and the outer frame 271 are enclosed to form a third space 275 corresponding to the sound chamber 224 and the second sound chamber 230 formed by the first sound chamber 220, and the third space 275. The volume of the rear acoustic chamber can be enlarged, and the second space 276 can enlarge the volume of the sound chamber before the sound chamber 223 and the third sound chamber 240 are formed by the cavity of the first sound chamber 220. The dimensions of the outer frame 271, the first inner frame 272 and the second inner frame £ 273 of the frame 27 need to be rationally designed to increase the second space 276 and the third space 275 as much as possible, and to make the frame The body 27 does not affect its vibration-damping effect because the outer frame 271, the first inner frame 272, and the second inner frame 273 are too small in size. When assembled, the speaker 21 is placed in the cavity 224 behind the cavity 21, the front sound hole 251 corresponds to the sound chamber 223 before the cavity 21, and the sound hole 252 corresponds to the rear sound chamber 224, The circuit board is disposed on one side of the cavity 21; the frame 27 is interposed between the circuit board 28 and the body 21 of the cavity 11 200826714, and the frame 27 is in contact with the circuit board 28 and the cavity 21 The adhesive can be sufficiently filled and bonded by an adhesive (not shown), and the frame 27 can also fill the gap between the circuit board 28 and the cavity 21, so that the front and rear acoustic chambers are respectively formed independently of each other. The relatively closed space; the built-in antenna 29 is attached to the bottom plate 211 of the cavity 21, and the positioning hole 299 is matched with the protruding post 229 on the bottom plate 211 of the cavity 21, and the two latching arms 298 pass through. The fixing hole 228 of the cavity 21 is engaged with the square wall 235 by the outward tension of the latching arm 298, and the ends of the two latching arms 298 pass through the first space 274 of the frame 27, so that the latching arm 298 is The bump 291 is connected to the circuit board 28. The speaker structure 20 is formed separately from the sound chamber (the front sound chamber 223 and the third sound chamber 240) and the rear sound chamber (the rear sound chamber 224 and the second sound chamber 230), and the speaker 25 is provided by the front sound hole 251 and The rear sound hole 252 emits an acoustic signal, and enters the front sound chamber and the rear sound chamber respectively to generate resonance, and is transmitted to the outside through the sound hole 227 on the side plate 212 of the cavity 21, so that the speaker structure 20 can be made on the one hand. The volume is fully utilized, and the volume of the cavity 21 is enlarged without increasing the volume and size of the mobile phone 1 to reduce the minimum resonance frequency of the speaker 25, thereby improving the low frequency response of the speaker 25, thereby improving The sound quality of the mobile phone 1 can form a unique resonance effect of the mobile phone 1. On the other hand, according to the analogy of the sound-vibration analysis software SYSNOISE, the response frequencies of the sound chamber before and after the speaker structure 20 are respectively at 2941 Hz and 3851 Hz. The sound of the mobile phone 1 adopting the speaker structure 20 is appropriate and tends to be stable 12 200826714, and can avoid the occurrence of sharpening or breaking of the squeaking sound. Rich texture and a sense of sound to obtain good quality of sound. In addition, in the speaker structure 20, since the frame body 27 is interposed, the front and rear acoustic chambers are respectively formed into relatively closed spaces, so that the sound wave can be prevented from leaking from the speaker structure 20, and the sound wave and the speaker structure 20 are prevented from being cavityd. The direct wave generated by the sound hole 227 of the side plate 212 of 21 generates interference, which can stabilize the frequency characteristic of the sound and improve the sound quality of the mobile phone 1. At the same time, the frame 27 is made of a vibration-damping material, and g can be lowered. Due to the resonance of the speaker 25 and the circuit board 28 caused by the sound of the speaker 25, the sound can be prevented from being disturbed. Furthermore, in the speaker structure 20, since the built-in antenna 29 and the circuit board 28 are disposed on both sides of the cavity 21, not only the space can be fully utilized, but also a good low-frequency response effect can be achieved, and the built-in antenna 29 can be prevented from being Circuit board 28 is subject to electromagnetic interference, resulting in good call quality. In summary, the present invention conforms to the requirements of the invention patent, and proposes a patent application according to law. It is to be understood that the above-mentioned preferred embodiments of the present invention are intended to be within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of an embodiment of a mobile electronic device (taking a mobile phone as an example) of the present invention. 2 is an exploded perspective view of the first perspective of the speaker structure and the built-in antenna of the mobile phone of FIG. 1. 13 200826714 Figure 3 is an exploded perspective view of the second perspective of the speaker structure and built-in antenna of Figure 2. 4 is a schematic structural view of a cavity in the speaker structure shown in FIG. 2. Fig. 5 is a partial assembly diagram of the speaker structure and the built-in antenna shown in Fig. 2. [Main component symbol description] Mobile phone 1 Housing 10 Key area 11 Display area 12 Sound area 13 Speaker structure 20 Cavity 21 Base plate 211 Side plate 212 First sound chamber 220 Ring wall 221 Flange 222 Front sound chamber 223 Rear sound chamber 224 sound hole 225 groove 226 sound hole 227 fixing hole 228 stud 229 second sound chamber 230 partition 231 second intersecting wall 232 first intersecting wall 233 square wall 235 third sound chamber 240 speaker 25 lug 250 front Sound hole 251 rear sound hole 252 frame 27 outer frame 271 first inner frame 272 second inner frame 273 first space 274 third space 275 second space 276 14 200826714 circuit board 28 built-in antenna 29 body 290 convex Point 291 Buckle arm 298 Positioning hole 299 f 15