1332225 九、發明說明： 【發明所屬之技術領域】 〃本發明涉及-種音頻播放裝置，尤其涉及 方疋轉的操作控制鈕的音頻播放裝置。 八有可 【先前技術】 隨著快閃記憶體（flash me_y)技術的成熟 路的普及，立相德说租W ri·' - ' 周際網 曰義裝置成爲人們生活的—部分1332225 IX. Description of the Invention: [Technical Field] The present invention relates to an audio playback device, and more particularly to an audio playback device for an operation control button.八有可 [Prior Art] With the popularity of flash me_y technology, Li Xiangde said that renting W ri·' - '周际网 曰 装置 成为 became part of people's lives
播放裔，該類音樂播放器的外形都很小巧。 PS 圖1爲一種現有的音頻播放裝置i，其 正面爲顯示螢幕η和操作控制按鍵12，爲節ς =門，其 整個音頻播放裝置1看起來更加簡潔美上間和使 鍵12釆用了手機上較爲常見的五維導航鍵，；按 的操作控制按鍵12，用拇指向上推動操作控制按鍵η斤: 的音量增大’向下推動操作控制按鍵12，： 頻播放裝置1的音量减小，向左推動操作控制按鍵η，立 =放，U擇下一個音頻文件，向右推動操作控制： 日頻播放裝置1選擇前-個音頻文件，而從正 下壓按該操作控制按鍵12，則會進人到音麵放裝置i的 設置模式’，，-個操作控制按鍵12可以控制音頻播玫裳 置1的五個參數。此類五維導航鍵的優勢在於功能整合、 便於單手操作，但易出現靈敏度問題，一種情况是操;控 制按鍵12過於靈敏，出現定位不准，誤操作等現象還^ -種情况是操作控制按鍵12的$敏度不够，需要用力推動 或麼下操作控制按鍵12才可順利操作，在這這種情况下頻 7 1332225 繁操作手指會感到不舒服。無論哪種情况，都使音頻播放 裝置1的操作手感大打折扣。此類控制按鍵12還有一個缺 點就是容易損壞，從而導致該音頻播放裝置1不可使用。 【發明内容】 本發明的目的在於提供一種音頻播放裝置，旋轉該音 頻播放裝置的操作控制鈕可調整該音頻播放裝置的音量或 選擇存儲於該音頻播放裝置中的音頻文件，從而解决現有 的音頻播放裝置操作手感不好以及控制按鍵容易損壞的問 題。 爲實現上述目的，本發明提供一種音頻播放裝置，包 括：殼體、PCB板、操作控制鈕及端蓋，該殼體的端部外 表面爲回轉體表面，該回轉體表面包含一通孔及一第一軸 向限位部分，該回轉體表面相對於該殼體的中部向軸心方 向收縮形成一台階結構，該PCB板包含至少一個觸發元 件，該觸發元件被觸動後，該音頻播放裝置執行一預定操 作，該操作控制鈕包含一回轉體内表面和至少兩個凸出於 該回轉體内表面的具有一定間隔的觸動件，該操作控制鈕 可通過該回轉體内表面套在該殼體的端部外表面並被該殼 體端部的台階結構支撑，此時，該觸動件收容於該通孔中， 該操作控制鈕可相對於該殼體作旋轉運動，該兩個觸動件 中的一個可在該通孔中運動並觸動該觸發元件，該端蓋包 含一第二軸向限位部分，該第二軸向限位部分可與該殼體 的第一軸向限位部分相互作用使得該端蓋可拆卸的連接於 該殼體的端部，連接於該殼體端部的端蓋在該殼體的軸綫 8 1332225 方向位於該操作控制鈕的外侧。 本發明提供的音頻播放裝置通過其操作控制鈕進行音 量調節或音頻文件選擇，只需旋轉操作控制鈕觸動上述 PCB板上的觸發元件即可完成上述操作，不會發生誤操 作，也不會因用力而使手指感到不舒服，從而易於操作和 使用，且不易損壞。 【實施方式】 參考圖2至圖4，本發明的音頻播放裝置2包括殼體 20、兩操作控制鈕30和31、耳機插座62、電源按鈕80、 第一端蓋40和第二端蓋42。該殼體20由兩個半殼體21 和22構成。該操作控制鈕30與31爲安裝於該殼體20的 端部表面上的薄壁圓環。該耳機插座62該與電源按鈕80 均外露於殼體20。該第一端蓋40連接於該殼體20的一端。 該第二端蓋42連接於該殼體20的另一端，將該第二端蓋 42取下，可以看到該半殼體22 —端向其軸心方向延伸出 一平面220，該平面220上有狹長方孔221與梯形孔222， 使得一外部記憶卡·插槽和一 USB連接埠外露於該平面 220。 同時參閱圖5至圖7，該音頻播放裝置2内部包含一 電池倉50、一 PCB板60和一 °刺D八41。該電池倉50用於 放置電池對該音頻播放裝置2供電，其通過螺釘螺紋連接 或其他連接方式（未圖示）固定在該半殼體22上。該PCB板 60的四個角的位置布置有觸發元件61和65，PCB板60 的正反兩面布置有一外部記憶卡插槽63和一 USB連接埠 9 64 〇 該 可以有1上還設置有耳機插座62，該耳機插座62 該冗^固或夕個，在本實施方式中耳機插座62爲兩個。 固定在=6G通過螺釘螺紋連接或其他連接方式（未圖示） 卡插槽63二池倉50上。該pcb板60固定後，該外部記憶 狭長方孔 SB祕埠64可分顺該半㈣22上的 槽63和/和梯形孔222才目對應’使得該外部記憶卡插 通過螺釘經聰連接琿64外露於平面220。電源按紐8〇 上m紋連接或其他方式（未圖示）連接到該半殼體21 機插座62H21和22通過4個螺釘9G固^在—起，該界 上的丰n 5各於該半殼體21上的半圓孔217和半殼體22 s圓孔223合在一起形成的圓孔。 面良2參閱圖8至圖12，該殼體20的端部201的外表 面二體表面，該回轉體表面在本實施方式中爲圓枉表 ；^ Ρ 201的外表面設置有一第一卡合部分2011，在 样？二!^中該第一卡合部* 2011爲-沿周向延伸的環 讀2〇U的橫截面爲方形。該端部201的外表面上 二：，有一沿圓周方向延伸的通孔211，該通孔211使得該 成體0内部的觸發元件61顯露。 半成體21端部固定有一復位元件在本實施方 =中’該復位^件7〇爲扭轉彈簧。該半殼體21内側表面 二、方向伸出—平面部分213，該平面213向端部方向 出-柱體212及-薄壁214，該薄壁214上開有一第〆 開口槽215。該扭轉彈簧7〇的螺旋部分套在該柱體212上， 该扭轉彈簧7G的兩扭臂分別卡在該第-開σ# 215的兩 ί簧錄訂受肋矩仙。該扭轉 进f末端均位於該通孔211内。 面3〇°ritn^30的内表面301爲回轉體表面，該内表 表面3(Π :圓杜：一卡合部分3〇2 ’在本實施方式中該内 沿圓周方向:ΐΙΓΐ二卡合部分302爲一條或多條 一心的:截一=軸向限位凸起·該 =操作控制# 3。上還設置有兩個觸動件303和綱， 301 ’該觸動件3〇3及3〇4爲凸出於該内表面 兩個作用件303及304具有 制幻〇轉動m胸殼體2g的該操作控 的-扭臂轉動，二或3〇4推動該復位元件70 扭矩的作用Λ ^呆作控制钮30受到該扭轉彈簧7〇的 7〇 30 接於該殼體2G的該操作控置轉=觸置Γ 。爲使操作控： 完成的觸動作用也由該觸動：^；^及控:；；3^其他結構 制二作控㈣安裝到該殼趙2。上:將該掉· 制鈕30的軸綫與該殼體 /、工 制紐30上的觸動件3〇3及2的軸殘對齊’並使該操作控 元件7〇位置相對應，然後卜殼體21端部的復位 作控制紐30沿該端部2()1 Μ體2〇的轴綫輕推操 的圓柱表面滑動。由於該第二卡 合部分302 (軸向限位凸起3〇2) 的内表面则，而該内表面训的直=:一 f表面的直徑相同’從而在輕推操作控制紐3。時二二0 〇1的圓柱表面發生彈性形變。直至該第二人 和第-卡合部分2()11完全卡合，302 部滑入該環槽2(m後，該形變消失。至此=起302全 3〇連接到該該殼體20的端部2〇1。 作控制鈕 該端部201相對於殼體2〇的中部2〇2 形成-台階結構，用於支撑套在該殼體20二二 =縮 30,並使得該操作控制紐3G和殼體2G “作控制紐 此時，該操作控制紐30上的觸動件3〇3及撕面圓^過渡。 端部201的通孔211内，該 句收谷於該 彈箐才劈士 ° 及304均位於扭轉 :::扭臂末端的外側。該環槽則 ， 於該軸向限位凸起3G2的寬 以冰度均大 可在圓周方向轉動並在軸=仵#作控制鈕30 毕、，戈方向不會脫球該殼體20。 作㈣心時’該觸動件％Playbacks, this type of music player is very small in appearance. PS Figure 1 shows a conventional audio playback device i with a display screen η and an operation control button 12 on the front side, which is a throttling = door, and the entire audio playback device 1 looks more concise and makes the key 12 use. The more common five-dimensional navigation button on the mobile phone; press the operation control button 12, push the operation control button with the thumb up ng: the volume is increased 'push down the operation control button 12, the volume of the frequency playback device 1 is reduced Small, push the operation control button η to the left, vertical = release, U select the next audio file, push the operation control to the right: the daily frequency playback device 1 selects the previous - an audio file, and presses the operation control button 12 from the down , it will enter the setting mode of the sound surface setting device i, and the operation control button 12 can control the five parameters of the audio broadcasting device. The advantage of this kind of five-dimensional navigation key is that the function is integrated and easy to operate with one hand, but it is easy to have sensitivity problem, one case is operation; the control button 12 is too sensitive, the positioning is not accurate, the operation is wrong, etc. The sensitivity of the button 12 is not enough, and it is necessary to push or control the button 12 to operate smoothly. In this case, the frequency of the finger 1 7332225 may be uncomfortable. In either case, the operational feel of the audio playback device 1 is greatly reduced. A further disadvantage of such a control button 12 is that it is easily damaged, resulting in the audio playback device 1 being unusable. SUMMARY OF THE INVENTION An object of the present invention is to provide an audio playback device, which can adjust the volume of the audio playback device or select an audio file stored in the audio playback device by rotating the operation control button of the audio playback device, thereby solving the existing audio. The problem that the playback device does not feel good and the control buttons are easily damaged. In order to achieve the above object, the present invention provides an audio playback device, including: a housing, a PCB board, an operation control button, and an end cover. The outer surface of the end of the housing is a surface of the rotating body, and the surface of the rotating body includes a through hole and a a first axial limiting portion, the surface of the rotating body is contracted with respect to a central portion of the housing to form a stepped structure, the PCB board includes at least one triggering component, and after the triggering component is activated, the audio playback device performs a predetermined operation, the operation control button includes a rotating inner surface and at least two movable members protruding from the inner surface of the rotating body, and the operating control button can be sleeved in the housing through the inner surface of the rotating body The outer surface of the end portion is supported by the stepped structure of the end portion of the housing. At this time, the trigger member is received in the through hole, and the operation control button is rotatably movable relative to the housing, and the two touch members are One of the ones can move in the through hole and touch the triggering member, the end cover includes a second axial limiting portion, and the second axial limiting portion can be coupled to the first axial limiting portion of the housing The sub-interaction allows the end cap to be detachably coupled to the end of the housing, and the end cap attached to the end of the housing is located outside the operating control button in the direction of the axis 8 1332225 of the housing. The audio playback device provided by the invention performs volume adjustment or audio file selection through its operation control button, and only needs to rotate the operation control button to touch the trigger component on the PCB board to complete the above operation without erroneous operation or force. It makes the fingers feel uncomfortable, so that it is easy to handle and use, and is not easily damaged. [Embodiment] Referring to FIGS. 2 to 4, the audio playback device 2 of the present invention includes a housing 20, two operation control buttons 30 and 31, a headphone jack 62, a power button 80, a first end cover 40, and a second end cover 42. . The housing 20 is composed of two half-shells 21 and 22. The operation control buttons 30 and 31 are thin-walled rings mounted on the end surface of the casing 20. The headphone jack 62 and the power button 80 are both exposed to the housing 20. The first end cover 40 is coupled to one end of the housing 20. The second end cover 42 is connected to the other end of the housing 20, and the second end cover 42 is removed. The end of the half-shell 22 extends to a plane 220 extending toward the axial direction thereof. The plane 220 The upper and lower square holes 221 and the trapezoidal holes 222 are formed such that an external memory card slot and a USB port are exposed to the plane 220. 5 to 7, the audio playback device 2 internally includes a battery compartment 50, a PCB board 60, and a spur D8. The battery compartment 50 is used to place a battery to power the audio playback device 2, which is secured to the half-shell 22 by screwing or other means of attachment (not shown). The four corners of the PCB board 60 are arranged with trigger elements 61 and 65. The front and back sides of the PCB board 60 are provided with an external memory card slot 63 and a USB port 埠 9 64. The socket 62, the earphone socket 62 is redundant or eve, and in the present embodiment, the earphone socket 62 is two. Fixed at =6G by screw thread connection or other connection method (not shown) card slot 63 on the second tank 50. After the pcb board 60 is fixed, the external memory slotted square hole SB secret 64 can be divided into the slot 63 on the half (four) 22 and/or the trapezoidal hole 222. The external memory card is inserted through the screw through the smart port. Exposed to the plane 220. The power button 8 is connected to the m-belt or other means (not shown) is connected to the half-shell 21, the sockets 62H21 and 22 are fixed by 4 screws 9G, and the bucks on the boundary are each A semi-circular hole 217 on the half-shell 21 and a circular hole formed by the half-hole 22 s round hole 223 are combined. Referring to FIG. 8 to FIG. 12, the outer surface of the end portion 201 of the casing 20 is a two-body surface, and the surface of the rotating body is a round table in the embodiment; the first surface of the outer surface of the casing 201 is provided with a first card. Part of 2011, in the sample? In the second! ^ the first engaging portion * 2011 is - the circumferentially extending ring reading 2 〇 U has a square cross section. The outer surface of the end portion 201 has a through hole 211 extending in the circumferential direction, and the through hole 211 causes the triggering member 61 inside the body 0 to be exposed. A reset element is fixed to the end of the semi-body 21 in the present embodiment. The reset member 7 is a torsion spring. The inner surface of the half-shell 21 extends in a direction-plane portion 213. The plane 213 extends toward the end portion - a column 212 and a thin wall 214. The thin wall 214 defines a second opening groove 215. The spiral portion of the torsion spring 7 is sleeved on the cylinder 212, and the twisted arms of the torsion spring 7G are respectively engaged with the two springs of the first opening σ#215. The twisted end of the f is located in the through hole 211. The inner surface 301 of the surface 3 〇 n ^ ^ 30 is the surface of the rotator, and the inner surface 3 (Π : 圆 : an engaging portion 3 〇 2 ' in the embodiment of the inner circumferential direction: the second snap The portion 302 is one or more of a single heart: cut limit protrusion · the = operation control # 3. There are also two touch members 303 and an outline, 301 'the touch pieces 3 〇 3 and 3 〇 4 is that the two action members 303 and 304 protruding from the inner surface have the operation-controlled torsion arm rotation of the illusionous rotation m chest housing 2g, and the second or third 〇4 pushes the torque of the reset element 70 Λ ^ The operation control button 30 is subjected to the operation of the torsion spring 7〇7〇30 to the housing 2G. The operation control: the operation of the touch is also performed by the touch: ^; Control:;; 3^ Other structure system control (4) Mounted to the shell Zhao 2. Upper: The axis of the button 30 and the actuator 3〇3 on the housing/work system 30 and The shaft residual alignment of 2 corresponds to the position of the operation control element 7〇, and then the reset of the end of the housing 21 is controlled by the control button 30 along the axis of the end 2()1 body 2〇. Cylindrical surface sliding Due to the inner surface of the second engaging portion 302 (axially restricting projection 3〇2), the inner surface of the straight surface is the same as the diameter of the f-th surface, thereby controlling the button 3 in the nudge operation. The surface of the cylinder at 2200 发生1 is elastically deformed until the second person and the first engaging portion 2() 11 are fully engaged, and 302 is slid into the ring groove 2 (m, the deformation disappears. The end portion 201 is connected to the end portion 2〇1 of the casing 20. The end portion 201 forms a step structure with respect to the middle portion 2〇2 of the casing 2〇 for supporting the casing. 2022==30, and the operation control button 3G and the casing 2G are “made as a control button. At this time, the actuation member 3〇3 and the tearing surface of the operation control button 30 are transitioned. The through hole of the end portion 201 In 211, the sentence is in the magazine and the 304 is located on the outer side of the torsion::: the end of the twisted arm. The ring groove is wider than the width of the axially extending protrusion 3G2. It can be rotated in the circumferential direction and the shaft = 仵# is used as the control button 30, and the housing 20 will not be detached from the direction of the ball. (4) When the heart is '% of the contact piece'
=推:該扭轉彈簣7。的扭臂在該通孔 J 使該操作㈣幻G與該扭轉彈簧7 轉動從而 用。當操作控制鈕3〇的 目互作 觸發元件61的位置時，觸被旋轉至可觸動 信號，相师制單件61被觸動從而發出觸發 置2執行H 該觸發信號，控制該音頻播放裝 選擇存如該音_放裝置2的音量或 選擇存储於該音頻播放萝 里4 復位兀件70之間的扭矩作用， 12 1332225 該操作控制la 30被彈回其初始位置。 優選的，爲保護該觸發元件61不會受力過度而損壞， 在該殼體20的端部201上還設置有一沿軸向延伸的第二開 口槽216，在該操作控制鈕30的内表面301設置一凸出於 該内表面301的周向限位凸起305，在該操作控制鈕30連 接於該殼體20後，該周向限位凸起305收容於該第二開口 槽216中，該操作控制鈕30轉動時，該周向限位凸起305 在該第二開口槽216中運動，在該觸發元件61被觸動後， 該操作控制鈕30的進一步轉動會因該周向限位凸起305抵 觸到該第二開口槽216的一邊而停止。 而將該操作控制鈕30從該殼體20拆下時，沿轴向慢 慢向外旋轉該操作控制鈕30，由於該第二卡合部分302的 截面爲弧形，其弧形表面沿著該環槽2011慢慢滑出，使得 該端部201的圓柱表面發生形變，直至該操作控制鈕30從 該殼體20上全部滑出，該形變消失。至此，該操作控制鈕 30與該殼體20分離。 同時參閱圖8、13、14，該殼體端部表面具有一第一 軸向限位部分。在本實施方式中，沿該殼體20的軸綫方向 從該殼體20的底面2012向下切除該端部201的圓柱表面 的部分材料形成多個溝槽2013。沿著該殼體20的軸綫方 向從該底面2012向下延伸在該溝槽2013内形成一凸起 2014，該凸起2014的外表面不高於該端部201的外表面， 該溝槽2013與該凸起2014構成一間隙2015,該間隙2015 即爲該第一軸向限位部分。 13 1332225 該喇叭41通過膠接或其他連接方式固定在該第一端 蓋40上，該第一端蓋40具有一第二軸向限位部分。在本 實施方式中，垂直於該第一端蓋40的底面401伸出一個或 多個挂鈎402，該挂鈎即爲該第二軸向限位部分。該挂鈎 402具有一與該底面401平行的平面部分4021。 沿著該殼體20的軸綫方向使該挂鈎402滑入該溝槽 2013中，然後旋轉該第一端蓋40，使該平面部分4021旋 入該間隙2015中，直至其接觸到該溝槽2013的一邊爲止， 至此，該第一端蓋40可鬆開的連接到該殼體20上。合理 設置間隙2015和挂鈎402的尺寸，使第一端蓋40便於連 接到殼體20上且不易松脫。 該第一端蓋40連接於該殼體20後可限制該操作控制 鈕30沿該殼體20的軸向移動，本發明爲進一步保證該操 作控制鈕30不會從該殼體20上松脫，在該殼體20和該操 作控制鈕30上設置了環槽2011和軸向限位凸起302。熟 悉本發明音頻播放裝置2原理的人員完全可以只利用該第 一端蓋40即可限制該操作控制鈕30的軸向移動。 該操作控制鈕31在該殼體20上的固定方式以及旋轉 觸動該觸發元件65產生觸發信號的結構同該操作控制鈕 30，該第二端蓋42在該殼體20上的連接方式同該第一端 蓋40，在此不再贅述。 【圖式簡單說明】 圖1為一現有音頻播放裝置的立體視圖。 圖2為本發明音頻播放裝置的立體視圖。。 14 1332225 圖3為本發明音頻播放裝置將防塵蓋取下後的立體視 圖。 圖4為本發明音頻播放裝置的一半殼體的立體視圖。 圖5為本發明音頻播放裝置的分解視圖。 圖6為本發明音頻播放裝置PCB板的立體視圖。 圖7為本發明音頻播放裝置PCB板另一角度的立體視 圖。 圖8為本發明音頻播放裝置將第一端蓋、喇队和操作控 制鈕取下後的立體視圖。 圖9為本發明音頻播放裝置另一半殼體的立體視圖。 圖10為本發明音頻播放裝置將第一端蓋和喇D八取下後 操作控制鈕與殼體分解的立體視圖。 圖11為本發明音頻播放裝置的操作控制鈕的立體視 圖。 圖12為本發明音頻播放裝置將第一端蓋和喇取下後 的立體視圖。 圖13為本發明音頻播放裝置的第一端蓋的立體視圖。 圖14為本發明音頻播放裝置將一操作控制鈕除去後第 一端蓋連接到殼體上的立體視圖。 【主要元件符號說明】 現有音頻播放器 顯示螢幕 操作控制按鍵 12 11 15 1332225 音頻播放裝置 2 殼體 20 殼體端部 201 第一卡合部分 2011 殼體底面 2012 溝槽 2013 凸起 2014 間隙 2015 殼體的中部 202 半殼體 21 通孔 211 柱體 212 平面部分 213 平面部分 214 第一開口槽 215 第二開口槽 216 半圓孑L 217 半殼體 22 平面 220 狹長方孔 221 梯形孔 222 半圓孔 223 操作控制鈕 30 内表面 301 16 1332225 第二卡合部分 302 觸動件 303 觸動件 304 周向限位凸起 305 操作控制鈕 31 第一端蓋 40 底面 401 掛鉤 402 平面部分 4021 口刺队 41 第二端蓋 42 電池倉 50 PCB板 60 觸發元件 61 耳機插座 62 記憶體插槽 63 USB連接埠 64 觸發元件 65 扭轉彈簧 70 電源按紐 80 螺釘 90 17=Push: The torsion magazine 7. The twisting arm is used in the through hole J to rotate the operation (4) and the torsion spring 7 to rotate. When the position of the control button 3 is operated to trigger the position of the triggering member 61, the touch is rotated to the triggerable signal, and the master unit 61 is touched to issue a trigger to execute the trigger signal 2 to control the audio playback device selection. The volume of the sound-discharge device 2 is selected or the torque stored between the audio-playing device 4 is reset. 12 1332225 This operation controls the la 30 to be bounced back to its original position. Preferably, in order to protect the triggering element 61 from being damaged by excessive force, a second opening groove 216 extending in the axial direction is further disposed on the end portion 201 of the housing 20, and the inner surface of the operation control button 30 is disposed. The 301 is provided with a circumferential limiting protrusion 305 protruding from the inner surface 301. After the operation control button 30 is connected to the housing 20, the circumferential limiting protrusion 305 is received in the second opening slot 216. When the operation control knob 30 rotates, the circumferential limiting protrusion 305 moves in the second opening slot 216. After the triggering element 61 is touched, the further rotation of the operation control button 30 is limited by the circumferential limit. The position protrusion 305 is stopped by the one side of the second opening groove 216. When the operation control knob 30 is detached from the housing 20, the operation control knob 30 is slowly rotated outward in the axial direction. Since the second engagement portion 302 has an arcuate cross section, the curved surface thereof is along the curved surface. The ring groove 2011 is gradually slid out so that the cylindrical surface of the end portion 201 is deformed until the operation control knob 30 is completely slid out from the casing 20, and the deformation disappears. To this end, the operation control button 30 is separated from the housing 20. Referring also to Figures 8, 13, and 14, the end surface of the housing has a first axial stop. In the present embodiment, a portion of the material of the cylindrical surface of the end portion 201 is cut downward from the bottom surface 2012 of the casing 20 in the axial direction of the casing 20 to form a plurality of grooves 2013. A protrusion 2014 is formed in the groove 2013 extending downward from the bottom surface 2012 along the axial direction of the housing 20, and the outer surface of the protrusion 2014 is not higher than the outer surface of the end portion 201, the groove 2013 and the protrusion 2014 form a gap 2015, which is the first axial limit portion. 13 1332225 The horn 41 is secured to the first end cap 40 by gluing or other attachment, the first end cap 40 having a second axial stop. In the present embodiment, one or more hooks 402 extend perpendicularly to the bottom surface 401 of the first end cap 40, which is the second axial stop portion. The hook 402 has a planar portion 4021 that is parallel to the bottom surface 401. The hook 402 is slid into the groove 2013 along the axial direction of the housing 20, and then the first end cover 40 is rotated to screw the planar portion 4021 into the gap 2015 until it contacts the groove Up to one side of the slot 2013, the first end cap 40 is releasably attached to the housing 20. The gap 2015 and the size of the hook 402 are reasonably set so that the first end cap 40 is easily attached to the housing 20 and is not easily loosened. The first end cover 40 is coupled to the housing 20 to restrict the axial movement of the operation control button 30 along the housing 20, and the present invention further ensures that the operation control button 30 does not come off the housing 20. A ring groove 2011 and an axial limiting projection 302 are provided on the housing 20 and the operation control knob 30. A person skilled in the art of the audio playback device 2 of the present invention can completely limit the axial movement of the operation control knob 30 by using only the first end cover 40. The manner in which the operation control button 31 is fixed on the housing 20 and the structure in which the triggering element 65 is triggered to generate a trigger signal is the same as the operation control button 30. The second end cover 42 is connected to the housing 20 in the same manner. The first end cover 40 will not be described herein. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional audio playback device. 2 is a perspective view of an audio playback device of the present invention. . 14 1332225 FIG. 3 is a perspective view of the audio playback device of the present invention with the dust cover removed. 4 is a perspective view of a half of the housing of the audio playback device of the present invention. Figure 5 is an exploded view of the audio playback device of the present invention. 6 is a perspective view of a PCB board of an audio playback device of the present invention. Figure 7 is a perspective view of another angle of the PCB of the audio playback device of the present invention. Figure 8 is a perspective view of the audio playback device of the present invention with the first end cap, the racquet, and the operation control knob removed. Figure 9 is a perspective view of the other half of the housing of the audio playback device of the present invention. Figure 10 is an exploded perspective view showing the operation control button and the housing of the audio playback device of the present invention with the first end cover and the handle D removed. Figure 11 is a perspective view of the operation control button of the audio playback device of the present invention. Figure 12 is a perspective view of the audio playback device of the present invention with the first end cap and the handle removed. Figure 13 is a perspective view of the first end cover of the audio playback device of the present invention. Figure 14 is a perspective view of the audio playback device of the present invention with the first end cover attached to the housing after the operation control button is removed. [Main component symbol description] Existing audio player display screen operation control button 12 11 15 1332225 Audio playback device 2 Housing 20 Housing end 201 First engagement portion 2011 Housing bottom surface 2012 Groove 2013 Raised 2014 Clearance 2015 Shell The middle portion of the body 202 half-shell 21 through hole 211 cylinder 212 plane portion 213 plane portion 214 first opening groove 215 second opening groove 216 semicircular 孑 L 217 half-shell 22 plane 220 narrow square hole 221 trapezoidal hole 222 semi-circular hole 223 Operation control button 30 inner surface 301 16 1332225 second engaging portion 302 touch member 303 contact member 304 circumferential limiting protrusion 305 operation control button 31 first end cover 40 bottom surface 401 hook 402 plane portion 4021 mouth stab team 41 second End cap 42 Battery compartment 50 PCB board 60 Trigger component 61 Headphone jack 62 Memory slot 63 USB port 埠 64 Trigger element 65 Torsion spring 70 Power button 80 Screw 90 17