201002029 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種滑動機構’尤其涉及一種用於行動電 話、個人數位助理（personal Digital Assistant，PDA)等 攜帶型電子裴置之滑動機構。 【先前技術】 近年來’行動電話、PDA等攜帶型電子裝置已經越來 越普及’滑動式攜帶型電子裝置更是倍受消費者之青睞和 喜愛。 目前滑動式攜帶型電子裝置多採用半自動滑動機 構。習知攜帶型電子裝置之半自動滑動機構於打開及關閉 時一般需用手推行一段距離後再借助彈性件之彈力自動 彈開或閉合。如圖i所示，一種習知攜帶型電子裝置之半 自動滑動機構，其包括滑動板11、背板12以及連接組件 13，滑動板U與背板12可相對滑動。連接組件13包括 連接部131，其藉由鉸軸132與滑動板U樞接，連接组件 13還包括連接部133，其藉由鉸軸134與背板12樞接， 連接組件13還包括位於連接部131、133之間之桿件，該 桿件設於連接部131、133之間，且其二端分別連接至= 接部131、133’該桿件包括中空外軸136及至少部分插入 中空外軸136内之中空内軸138。該桿件内插設有—根彈 簧139,彈簧139二端分別抵持中空外軸1;36及中空内軸 138之相對端。 上述滑動機構處於關閉狀態時，滑動板n位於背板 201002029 12之一端’彈们39受到輕微之壓縮，當需要打開滑動機 構時，推動滑動板11向背板12另一端滑動，彈箬被 壓縮，且彈力逐漸增大，中空内轴138進一步套入中空外 軸136中，當到達中間狀態時，彈簧139被壓縮至最短， 此時其提供之彈力最大，當越過中間狀態後即便不施加外 力’滑動板11亦會於彈簧139之彈力作用下繼續向背板 12之另-卿動，直至滑域構處於完全㈣狀態。關閉 滑動機構之工作原理與打開時相同。 上述滑動機構於打開及關閉過程都需藉由 成，使用不便。 【發明内容】 鐾於上述内容，有必要提供—種使用方便之滑動機 構。 -種滑動麟，其包赌性件、㈤目組件、可相 動之背板及賴板，該滑動件可於轉性件作用下= 背板自動滑動’該開關組件包括作動件、彈性體、= 可轉動連接之第-卡合件及與滑動板固定之第:卡ί 件，該第—卡合件可旋轉以與該第二卡合件卡合或_; t，該彈性體用於使偏轉之第—卡合件復位，該作動 知與§亥第--^合件相連，並可推#* # # ^ ν 推動该第一卡合件旋轉而觫 除第 ^合件與第二卡合件之卡人。 本發明滑動機構藉由按下作動件即可解 件與第二卡合件之卡合從而使該滑動板㈣背板自^ 動，與習知技術相比，使用較為方便。 β 7 201002029 【實施方式】 下面將結合附圖及實施方式對本發明之滑動機構做 進一步詳細說明。 請參閱圖2，本發明較佳實施方式之滑動機構100應 用於攜帶型電子裝置。滑動機構100包括背板20、滑動板 30、背板滑執40、卷簧50、套筒62及開關組件70，其中 背板20及滑動板30分別固定於攜帶型電子裝置設置有多 媒體鍵及數位鍵之主單元（圖未示）及顯示單元（圖未示） 上，以將該顯示單元可滑動地連接至該主單元。 該背板20大體為一矩形板，其具有二相對之端部 201、202,背板20包括一底板22、第一凸邊24及第二凸 邊25。第一凸邊24及第二凸邊25為底板22之二相對側 朝底板22同一側彎折突出少許而成。底板22上與第二凸 邊25同侧之二端還分別形成有一限位部26，該限位部26 為沿垂直底板22方向彎折而成之二條狀凸起。底板22上 靠近其一端之位置還開設有一方形缺口 27，底板22之中 部靠近二側端還分別設置有一第一銷孔28,而靠近二限位 部26之位置分別設置有一樞接孔29。 該滑動板30大體為一矩形板，其包括一基部32及二 滑槽34。基部32大約於其中心位置上開設有二並排且靠 近之第二銷孔36，基部32上靠近一側之縱向上還開設有 二鎖固孔37。滑槽34為基部32二相對側向基部32同一 側向内彎折而成，形成滑槽34之滑動板30二側之中部開 設有卡固孔38。 201002029 該背板滑執40大致為長條形結構，其一側之中央位 置上形成有一方形凸塊42,凸塊42用於與滑動板30上之 卡固孔38相互卡合。背板滑軌40之另一側開設有一沿背 板滑軌40長度方向延伸之開槽44，該開槽44與背板20 之第一凸邊24及第二凸邊25相互配合，背板滑軌40用 於部分容納於滑動板30之滑槽34内，並藉由凸塊42與 卡固孔38之卡合相對滑動板30固定。 卷簧50由具有一定寬度之彈性片繞一軸線盤卷而 成，卷簧50包括捲曲部52及自由端54，當自由端54從 捲曲部52拉伸出一段距離後，於捲曲部52及自由端54 之間形成拉伸部56 (見圖5)，捲曲部52會受到拉伸部56 之拉力，在一定之拉伸長度範圍内，該拉力為近似恒定力。 開關組件70包括一連接桿72、二拉簧74、二作動件 76、二第一卡合件78及二第二卡合件82。 連接桿72包括桿部722及由桿部722二端分別向同 一側彎折形成之二連接部724。桿部722中部固定有一按 鍵75 (見圖4 )，以供使用者進行操作。連接部724由端 面向内開設有一卡槽726 (見圖3)。拉簣74為二端直徑 比中間大之柱狀彈篑，且其二端之直徑大於限位部26二 條狀凸起間之距離。作動件76包括依次相連之卡固部 762、心轴764及抵壓部766。卡固部762用於與連接桿 72内之卡槽726卡合固定，心軸764用於套設拉簧74， 且抵壓部766之徑向尺寸大於拉簧74二端之内徑，從而 可防止拉簧74套設於作動件76上時從抵壓部766脫落。 201002029 第一卡合件78 —端設有第一卡鉤部784,靠近第一卡 鉤部784相對端上開設有限位槽786。限位槽786為一尺 寸由内向外逐漸減小之燕尾槽。限位槽786用於容納作動 件76之抵壓部766及拉簧74之一端，並可使抵壓部766 於其内進行小範圍之活動。第一卡合件78上與第一卡鉤 部784朝向相鄰之一侧還開設有一鉚接孔（圖未示 弟二卡合件82形狀與第--^合件78類似，其一端設 有第二卡鉤部824 ’且與第二卡鉤部824相鄰之一側開設 有鉚接孔826。鉚接孔826與滑動板30上之鎖固孔37對 應’用於藉由鉚釘85與鉚接孔826及鎖固孔37鉚合從而 將第二卡合件82與滑動板30固定。 裝配時，請同時參閱圖4,首先將卷簧50之捲曲部 52及自由端54分別固定繞卷於二套筒62之外側面上，接 著將鉚釘66可*轉動地穿過套設有捲曲部52之套筒62及 第一銷孔28旅鉚合，以將卷簧50之捲曲部52可轉動連 接至背板20上；然後將二背板滑軌40分別嵌入至滑動板 30二側之滑槽34，且凸塊42與卡固孔38相卡合；之後 再將背板20之第一凸邊24及第二凸邊25分別插入背板 滑軌40之二開槽44中，最後將鉚釘66可轉動地穿過設 有自由端54之套筒62及第二銷孔36並鉚合，從而將卷 簧50之自由端54可轉動連接至滑動板30上。 裝配完滑動機構1〇〇之主體後，接著組裝開關組件 70。請同時參閱圖3 ’首先將鉚釘79插入背板20之樞接 孔29後及第/卡合件78之鉚接孔並與背板20鉚合，從 201002029 而將第一卡合件78可轉動地連接至背板20上靠近端部 2〇1處，接著將拉簧74套入作動件76之心軸764上，使 其，於作動件76之卡固部762及抵壓部766之間，並使 拉簧74之一端與作動件76之抵壓部766置於第一卡合件 78之限位槽786内以免從軸向脫出限位槽786，而拉簧％ 之另—端與卡固部762抵擋於限位部26上遠離限位槽786 之外側。然後於靠近背板2〇之端部2〇2亦按同樣方式裝 上另一拉簧74、作動件76及第一卡合件78。最後將連接 桿72之二卡槽726分別對準二作動件76之卡固部762中 並與其卡合。在較佳實施方式中，拉簧74預先被拉伸少 許。 下面將詳細說明滑動機構100之滑動過程。請參照圖 4至圖6，圖4為滑動機構100之關閉狀態圖，圖5為滑 動機構100之滑動板30朝背板20端部201滑動後之打開 狀態圖，圖6為滑動機構10〇之滑動板3〇朝背板2〇端部 ί 202滑動後之打開狀態圖。當滑動機構100處於關閉狀態 時’如圖4所示’滑動板30位於背板20之中部，此時卷 黃50基本處於自然狀態，當需要朝背板2〇之端部2〇1打 開滑動機構1〇〇時’推動滑動板30向背板20之端部201 滑動’卷簧50之捲曲部52逐漸被拉伸，而滑動板30上 罪近端部201之第二卡合件82逐漸靠近位於端部201附 近之第一卡合件78。當第二卡合件82之第二卡鉤部824 與第—卡合件78之第一卡鉤部784相抵時，繼續推動滑 動板30滑動，第二卡鉤部824推動第--^合件78沿逆時 11 201002029 針方向偏轉一定負度，此時拉簧74被拉伸，當第二卡鉤 部824越過第〆肀鉤部784時，第一卡合件兀於拉簧74 回復力作用下反向旋轉而復位，並卡住第二卡鉤部824， 此時，卷簧50之捲曲部52於端部201被最大拉伸’如圖 5所示，滑動機構1〇0位於向背板20之端部201之完全打 開狀態，此時，播帶变電子襄置上與背板20固定之主單 元上之多媒體鍵露出。當需要關閉滑動機構100時’按下 連接桿72中部之按鍵75 ’則作動件76之抵壓部766抵壓 並推動第一卡合件78沿逆時針方向偏轉一定角度’此時， 第二卡鉤部824脫離第一卡鈞部784，滑動板30於卷簧 50對滑動板30之拉力作用下自動回復至圖3所示之關閉 狀態。滑動機構100從關閉狀態往背板20端部202之打 開狀態之工作原理與上述相同，滑動機構1〇〇往背板20 之端部202打開後之狀態如圖6所示，此時，攜帶型電子 裝置上與背板20固定之主早元上之數位鍵露出。 本發明之滑動機構100藉由按下按鍵75即可解除第 一卡合件78與第二卡合件82之卡合從而實現自動關閉， 無需手動推動滑動板30 ’故與習知自動滑動機構相比，操 作較為方便。滑動機構1〇〇可由關閉狀態實現雙向打開， 可滿足’消費者之更多需求。同時，由於卷簧5〇之拉力比 車父恒定’滑動機構1〇〇於整個打開及關閉過程中受到之衝 擊較小。另外，卷簧50之盤卷軸線與背板20相對滑動板 3〇之滑動介面垂直，故滑動機構1〇〇之厚度較小。 可以理解’本發明之第二卡合件82亦可直接成型於 12 201002029 滑動板30上，拉簧74亦可為内徑相同之柱狀彈簣，此時， 其二端分別固定於第一卡合件78及限位部26或分別固定 於抵壓部766及限位部26。作動件76之抵壓部766亦可 與第一卡合件78相對固定或一體成型。拉簧74還可採用 壓簧等彈性體代替，此時之壓簧二端分別定位於背板20 之限位部26及作動件76之卡固部762。此外，連接桿72 及按鍵75可省略，而直接藉由按下作動件76之卡固部762 使打開之滑動機構100自動回復至關閉狀態。 另外可以理解，本發明之滑動機構100還可包括一或 二個以上之卷簣50，其捲曲部52均與該背板20連接，而 自由端54均與該滑動板30連接。卷簧50之捲曲部52亦 可與該滑動板30連接，而自由端54與該背板20連接。 卷簧50之盤卷軸線除較佳實施方式中與滑動介面之方向 垂直外，還可與該滑動介面相交。另外，卷簣50亦可為 其他用於使滑動板30自動回到關閉狀態之彈性件，如拉 簧等。 綜上所述，本發明確已符合發明專利要件，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，舉凡熟悉本案技藝之人士，於援依本案發明精神所作 之等效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 圖1係一種習知滑動機構之結構圖。 圖2係本發明較佳實施方式之滑動機構立體分解圖。 圖3係圖2之滑動機構之開關組件剖視圖。 13 201002029 圖4係圖2之滑動機構關閉狀態圖。 圖5係圖4之滑動機構滑動板滑至背板一端之打開狀 態圖。 圖6係圖4之滑動機構滑動板滑至背板另一端之打開 狀態圖。 【主要元件符號說明】 滑動機構 100 背板 20 端部 201、202 底板 22 第一凸邊 24 第二凸邊 25 限位部 26 缺口 27 第一銷孔 28 柩接孔 29 滑動板 30 基部 32 滑槽 34 第二銷孔 36 鎖固孔 37 卡固孔 38 背板滑軌 40 凸塊 42 開槽 44 卷簧 50 捲曲部 52 自由端 54 拉伸部 56 套筒 62 開關組件 70 連接桿 72 桿部 722 連接部 724 卡槽 726 拉簧 74 按鍵 75 作動件 76 卡固部 762 心轴 764 抵壓部 766 第·—合件 78 14 201002029 第一卡鉤部 第二卡合件 鉚接孔 784 限位槽 786 82 第二卡鉤部 824 826 鉚釘 66、79、85 15201002029 IX. Description of the Invention: The present invention relates to a sliding mechanism', and more particularly to a sliding mechanism for a mobile electronic device such as a mobile phone, a personal digital assistant (PDA) or the like. [Prior Art] In recent years, portable electronic devices such as mobile phones and PDAs have become more and more popular. Sliding portable electronic devices are favored and loved by consumers. At present, the sliding type portable electronic device mostly adopts a semi-automatic sliding mechanism. The semi-automatic sliding mechanism of the conventional portable electronic device generally needs to be manually opened for a certain distance after opening and closing, and then automatically opened or closed by the elastic force of the elastic member. As shown in FIG. 1 , a semi-automatic sliding mechanism of a conventional portable electronic device includes a sliding plate 11 , a back plate 12 , and a connecting component 13 . The sliding plate U and the back plate 12 are relatively slidable. The connecting component 13 includes a connecting portion 131 pivotally connected to the sliding plate U by a hinge 132. The connecting component 13 further includes a connecting portion 133 pivotally connected to the backing plate 12 by a hinge 134. The connecting component 13 further includes a connection. a rod between the portions 131, 133, the rod member is disposed between the connecting portions 131, 133, and the two ends thereof are respectively connected to the = joint portion 131, 133'. The rod member comprises a hollow outer shaft 136 and at least partially inserted into the hollow A hollow inner shaft 138 in the outer shaft 136. The rod member is internally provided with a root spring 139, and the two ends of the spring 139 respectively abut the opposite ends of the hollow outer shaft 1; 36 and the hollow inner shaft 138. When the sliding mechanism is in the closed state, the sliding plate n is located at one end of the back plate 201002029 12, and the springs 39 are slightly compressed. When the sliding mechanism needs to be opened, the sliding plate 11 is pushed to slide to the other end of the backing plate 12, and the magazine is compressed. The elastic force is gradually increased, and the hollow inner shaft 138 is further inserted into the hollow outer shaft 136. When the intermediate state is reached, the spring 139 is compressed to the shortest position, and the elastic force provided by the spring 139 is maximized, and even when the intermediate state is not applied, the external force is not applied. The sliding plate 11 will continue to move to the back plate 12 under the elastic force of the spring 139 until the sliding domain is in the full (four) state. Closing The sliding mechanism works the same as when it is opened. The above-mentioned sliding mechanism needs to be used in the opening and closing process, which is inconvenient to use. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a sliding mechanism that is easy to use. - a sliding lining, a gambling element, a (5) mesh component, a movable backing plate and a slab, the sliding member can be slid under the action of the rotating member = the back plate automatically slides. The switch assembly includes an actuating member and an elastic body , a rotatably connected first-engaging member and a third member fixed to the sliding plate, the first engaging member being rotatable to engage with the second engaging member or _; t, the elastic body In order to reset the first engaging member of the deflection, the action is connected with the §海第-^^, and pushes the #*##^ ν to push the first engaging member to rotate and remove the second member and The card holder of the second engaging member. The sliding mechanism of the present invention can facilitate the self-moving of the sliding plate (four) back plate by pressing the actuating member to engage the second engaging member, which is convenient to use compared with the prior art. β 7 201002029 [Embodiment] Hereinafter, the sliding mechanism of the present invention will be described in further detail with reference to the accompanying drawings and embodiments. Referring to Figure 2, the sliding mechanism 100 of the preferred embodiment of the present invention is applied to a portable electronic device. The sliding mechanism 100 includes a back plate 20, a sliding plate 30, a back plate sliding 40, a coil spring 50, a sleeve 62 and a switch assembly 70. The back plate 20 and the sliding plate 30 are respectively fixed to the portable electronic device and provided with multimedia keys and The main unit (not shown) of the digital key and the display unit (not shown) are slidably connected to the main unit. The backing plate 20 is generally a rectangular plate having two opposite ends 201, 202. The backing plate 20 includes a bottom plate 22, a first flange 24 and a second flange 25. The first flange 24 and the second flange 25 are formed by bending a pair of opposite sides of the bottom plate 22 toward the same side of the bottom plate 22. Further, a limiting portion 26 is formed on each of the two ends of the bottom plate 22 and the same side of the second flange 25. The limiting portion 26 is a two-shaped protrusion which is bent in the direction of the vertical bottom plate 22. A square notch 27 is defined in the bottom plate 22 near the one end thereof. A first pin hole 28 is disposed in the middle of the bottom plate 22 near the two side ends, and a pivot hole 29 is disposed adjacent to the two limiting portions 26 respectively. The sliding plate 30 is generally a rectangular plate including a base portion 32 and two sliding slots 34. The base portion 32 is provided with two second pin holes 36 adjacent to each other at a center position thereof, and two locking holes 37 are formed in the longitudinal direction of the base portion 32 near one side. The sliding groove 34 is formed by bending the base portion 32 opposite to the lateral base portion 32 in the same direction, and a locking hole 38 is formed in a middle portion of the sliding plate 30 forming the sliding groove 34. 201002029 The back plate slide 40 has a substantially elongated structure, and a square projection 42 is formed at a central position of one side thereof, and the projection 42 is for engaging with the fastening hole 38 of the sliding plate 30. The other side of the backboard rail 40 defines a slot 44 extending along the length of the back rail 40. The slot 44 cooperates with the first flange 24 and the second flange 25 of the backboard 20, and the backplane The slide rail 40 is partially received in the sliding groove 34 of the sliding plate 30, and is fixed to the sliding plate 30 by the engagement of the projection 42 and the fixing hole 38. The coil spring 50 is formed by winding an elastic piece having a certain width around an axis. The coil spring 50 includes a curling portion 52 and a free end 54. After the free end 54 is stretched from the curling portion 52 by a distance, the curling portion 52 is A stretched portion 56 (see Fig. 5) is formed between the free ends 54 and the crimped portion 52 is subjected to a tensile force of the stretched portion 56 which is an approximately constant force over a range of stretched lengths. The switch assembly 70 includes a connecting rod 72, two tension springs 74, two actuating members 76, two first engaging members 78 and two second engaging members 82. The connecting rod 72 includes a rod portion 722 and two connecting portions 724 which are formed by bending the two ends of the rod portion 722 toward the same side. A button 75 (see Fig. 4) is fixed in the middle of the rod portion 722 for the user to operate. The connecting portion 724 is formed with a card slot 726 (see Fig. 3) from the end surface. The pull tab 74 is a cylindrical magazine having a diameter larger than the middle of the two ends, and the diameter of the two ends is larger than the distance between the two protrusions of the limiting portion 26. The actuator 76 includes a fastening portion 762, a spindle 764, and a pressing portion 766 which are sequentially connected. The locking portion 762 is configured to be engaged with the slot 726 in the connecting rod 72. The spindle 764 is used to sleeve the tension spring 74, and the radial dimension of the pressing portion 766 is larger than the inner diameter of the two ends of the tension spring 74, thereby The tension spring 74 can be prevented from coming off the pressing portion 766 when it is sleeved on the actuator 76. 201002029 The first engaging member 78 is provided with a first hook portion 784 at its end, and a limiting slot 786 is defined at an opposite end of the first hook portion 784. The limiting slot 786 is a dovetail slot whose size gradually decreases from the inside to the outside. The limiting groove 786 is for receiving the pressing portion 766 of the actuator 76 and one end of the tension spring 74, and allows the pressing portion 766 to perform a small range of movement therein. The first engaging member 78 and the first hook portion 784 are further provided with a riveting hole toward the adjacent one side (the shape of the second engaging member 82 is similar to that of the first fitting member 78, and one end thereof is provided. The second hook portion 824 ′ and one side adjacent to the second hook portion 824 are provided with a rivet hole 826. The rivet hole 826 corresponds to the locking hole 37 on the sliding plate 30 'for the rivet 85 and the rivet hole The 826 and the locking hole 37 are riveted to fix the second engaging member 82 and the sliding plate 30. When assembling, please refer to FIG. 4 at the same time, firstly, the curling portion 52 and the free end 54 of the coil spring 50 are respectively fixed around the second winding member. On the outer side of the sleeve 62, the rivet 66 is then rotatably rotatably passed through the sleeve 62 provided with the curling portion 52 and the first pin hole 28 to rive the knurled portion 52 to rotatably connect the curl portion 52 of the coil spring 50. The two backplane rails 40 are respectively inserted into the sliding slots 34 on the two sides of the sliding panel 30, and the bumps 42 are engaged with the locking holes 38; then the first convexity of the backing plate 20 is then The edge 24 and the second flange 25 are respectively inserted into the two slots 44 of the back plate rail 40, and finally the rivet 66 is rotatably passed through the sleeve 62 and the second pin hole 36 provided with the free end 54 and riveted. Thereby, the free end 54 of the coil spring 50 is rotatably coupled to the slide plate 30. After assembling the main body of the slide mechanism 1〇〇, the switch assembly 70 is assembled. Please refer to FIG. 3 simultaneously, the rivet 79 is first inserted into the back plate 20. After the pivot hole 29 and the riveting hole of the/the engaging member 78 are riveted to the back plate 20, the first engaging member 78 is rotatably connected to the back plate 20 from the end portion 2〇1 from 201002029, Then, the tension spring 74 is sleeved on the mandrel 764 of the actuating member 76 between the locking portion 762 of the actuating member 76 and the pressing portion 766, and the one end of the tension spring 74 is pressed against the actuating member 76. The portion 766 is disposed in the limiting slot 786 of the first engaging member 78 to prevent the limiting slot 786 from being axially disengaged, and the other end of the tension spring and the locking portion 762 are resisted from the limiting portion 26 away from the limiting portion. The outer side of the groove 786. Then, the other tension spring 74, the actuating member 76 and the first engaging member 78 are attached in the same manner to the end portion 2〇2 of the back plate 2〇. Finally, the two card slots of the connecting rod 72 are attached. The 726 is respectively aligned with and engaged with the fastening portion 762 of the second actuator 76. In the preferred embodiment, the tension spring 74 is stretched a little in advance. Referring to FIG. 4 to FIG. 6 , FIG. 4 is a closed state view of the sliding mechanism 100 , and FIG. 5 is an open state diagram of the sliding plate 30 of the sliding mechanism 100 sliding toward the end portion 201 of the back plate 20 , Fig. 6 is an open state view of the sliding plate 3 of the sliding mechanism 10 滑动 sliding toward the end plate 〇 end ί 202. When the sliding mechanism 100 is in the closed state, 'the sliding plate 30 is located on the back plate 20 as shown in FIG. In the middle part, at this time, the yellowing 50 is substantially in a natural state, and when it is necessary to open the sliding mechanism 1〇〇 toward the end 2〇1 of the backing plate 2', the sliding plate 30 is pushed to slide toward the end 201 of the backing plate 20' coil spring 50 The curled portion 52 is gradually stretched, and the second engaging member 82 of the sin proximal end portion 201 of the sliding plate 30 gradually approaches the first engaging member 78 located near the end portion 201. When the second hook portion 824 of the second engaging member 82 abuts the first hook portion 784 of the first engaging member 78, the slide plate 30 is continuously pushed to slide, and the second hook portion 824 pushes the first hook portion 824. The piece 78 is deflected by a certain degree of negativeness in the reverse direction 11 201002029, and the tension spring 74 is stretched. When the second hook portion 824 passes over the second hook portion 784, the first engaging member is replied to the tension spring 74. The force is reversely rotated to reset, and the second hook portion 824 is caught. At this time, the curl portion 52 of the coil spring 50 is maximally stretched at the end portion 201 as shown in FIG. 5, and the sliding mechanism 1〇0 is located. The fully open state of the end portion 201 of the backing plate 20, at this time, the multimedia key on the main unit fixed to the backing plate 20 is exposed. When the sliding mechanism 100 needs to be closed, the button 75 of the middle of the connecting rod 72 is pressed, and the pressing portion 766 of the actuating member 76 presses and pushes the first engaging member 78 to deflect a certain angle in the counterclockwise direction. The hook portion 824 is disengaged from the first latch portion 784, and the slide plate 30 automatically returns to the closed state shown in FIG. 3 under the pulling force of the coil spring 50 against the slide plate 30. The working principle of the sliding mechanism 100 from the closed state to the open state of the end portion 202 of the backboard 20 is the same as that described above, and the state in which the sliding mechanism 1 is opened to the end portion 202 of the backing plate 20 is as shown in FIG. The digital key on the main early element fixed to the back plate 20 on the electronic device is exposed. The sliding mechanism 100 of the present invention can release the engagement of the first engaging member 78 and the second engaging member 82 by pressing the button 75 to realize automatic closing, without manually pushing the sliding plate 30', and the conventional automatic sliding mechanism Compared, the operation is more convenient. The sliding mechanism 1 can be opened in both directions by the closed state, which can satisfy the more demand of the consumer. At the same time, since the tension of the coil spring 5 比 is smaller than that of the vehicle constant 'sliding mechanism 1 〇〇 during the entire opening and closing process. Further, the disk reel line of the coil spring 50 and the back plate 20 are perpendicular to the sliding interface of the sliding plate 3, so that the thickness of the sliding mechanism 1 is small. It can be understood that the second engaging member 82 of the present invention can also be directly formed on the sliding plate 30 of 12 201002029, and the tension spring 74 can also be a cylindrical elastic body having the same inner diameter. At this time, the two ends thereof are respectively fixed to the first one. The engaging member 78 and the limiting portion 26 are respectively fixed to the pressing portion 766 and the limiting portion 26 . The pressing portion 766 of the actuating member 76 can also be fixed or integrally formed with the first engaging member 78. The tension spring 74 can also be replaced by an elastic body such as a compression spring. At this time, the two ends of the compression spring are respectively positioned on the limiting portion 26 of the back plate 20 and the fastening portion 762 of the actuating member 76. In addition, the connecting rod 72 and the button 75 can be omitted, and the opened sliding mechanism 100 is automatically returned to the closed state by directly pressing the locking portion 762 of the actuating member 76. In addition, it can be understood that the sliding mechanism 100 of the present invention may further include one or more reels 50, the curling portions 52 of which are connected to the backing plate 20, and the free ends 54 are connected to the sliding plate 30. The curling portion 52 of the coil spring 50 can also be coupled to the sliding plate 30, and the free end 54 is coupled to the backing plate 20. The disk reel line of the coil spring 50 may intersect the sliding interface in addition to the direction of the sliding interface in the preferred embodiment. Alternatively, the reel 50 may be another elastic member such as a spring or the like for automatically returning the slide plate 30 to the closed state. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural view of a conventional sliding mechanism. 2 is an exploded perspective view of a sliding mechanism in accordance with a preferred embodiment of the present invention. Figure 3 is a cross-sectional view of the switch assembly of the sliding mechanism of Figure 2. 13 201002029 Figure 4 is a diagram showing the closed state of the sliding mechanism of Figure 2. Fig. 5 is a view showing the opening state of the sliding mechanism sliding plate of Fig. 4 sliding to one end of the backing plate. Fig. 6 is a view showing the opening state of the sliding mechanism sliding plate of Fig. 4 sliding to the other end of the backing plate. [Main component symbol description] Sliding mechanism 100 Back plate 20 End portion 201, 202 Base plate 22 First flange 24 Second flange 25 Limit portion 26 Notch 27 First pin hole 28 柩 hole 29 Sliding plate 30 Base portion 32 Slip Slot 34 Second pin hole 36 Locking hole 37 Fixing hole 38 Back plate rail 40 Bump 42 Slot 44 Coil spring 50 Curl 52 Free end 54 Stretching portion 56 Sleeve 62 Switch assembly 70 Connecting rod 72 Rod 722 connecting part 724 card slot 726 tension spring 74 button 75 actuating member 76 fixing portion 762 spindle 764 pressing portion 766 first - fitting 78 14 201002029 first hook portion second engaging portion riveting hole 784 limit groove 786 82 second hook part 824 826 rivet 66, 79, 85 15