201033489 i rjLKjuyyj 11 32230twf.doc/n 六、發明說明： 【發明所屬之技術領域】 且古於—種姉結構，且特別是有關於一種 八有/月動片Μ於第—轉軸與第二轉軸之間的樞轴結構。 【先前技術】 ❿ 市面上¥見的電子產品’例如筆記 與螢幕之間為了達到開合的效果，故在主機與螢幕之間ΐ 设有樞軸，以提錢幕相對於主機展開朗合的功能。此 外，樞軸的設計不再侷限於單向的展開或閉合動作，而需 :==5開啟至大於某個角度時，可透過轉向機構 對螢幕做180度之旋轉’使螢幕之顯示面朝外。因此，有 單向的樞軸結構及雙向的樞軸結構之別。 一圖1繪示習知一種雙向的枢轴結構應用於筆記型電腦 的示意圖。請參考圖1，樞軸結構11〇具有第一支架112、 第二支架114、第一轉軸116、第二轉軸118以及支撐架 120。第一支架112鎖固於螢幕上，而支撐架12〇藉由第一 轉軸116連接第一支架112 ’以使螢幕相對於主機做垂直 軸向Υ的旋轉。此外，第二支架114鎖固於主機上，而支 樓架120的兩端分別藉由第二轉軸jig連接第二支架 114，以使螢幕可相對於主機做水平轴向X的旋轉。 然而，若第一轉軸116與第二轉軸118之間並無限位 件來限制螢幕旋轉時的作動關係時，螢幕在第一轉軸116 與第二轉轴118上的旋轉容易產生危險，尤其是當螢幕在 201033489 lrzuuvuu 32230twf.doc/n 如何 ㈣^軸向Y的旋轉時’螢幕常因開啟的角度 到主機，或是開啟的角度太大而碰撞到桌面。^而㈣里 改善上述的缺陷，實為本發明研發之重點。 【發明内容】 本發明提供-馳減構，Μ改善上述的缺 本發明提出-種樞轴結構，連接於第一殼體鱼J 體之間，枢轴結構包括第—支架、第二支架、第二=二 第二轉轴、支撐架以及滑動片。第—支架固定於第—殼體 上。第二支架岐於第二殼體上。第—轉轴位於第向 上’第-轉軸連接第-支架。第二轉軸位於第二轴向上， 第二轉軸之兩端連接第二支架之相對兩側。支撐架連接於 第-轉轴與第二轉轴之間，以使第—殼體在第—軸向或第 二軸向上相對於第二殼體旋轉。滑動片滑設於第一轉軸與 第二轉轴之間’其巾當第—殼體在第二軸向上旋轉且旋轉 角度小於一下限值時，滑動片卡合於第一轉轴的第一定位 部中，以禁止第一殼體在第一軸向上旋轉，而當第一殼體 的旋轉角度大於下限值並小於一上限值時，滑動片朝第二 轴向移動並卡合於一第二定位部中，並解除滑動片與第— 轉轴之卡固，以使第一殼體可在第一軸向上旋轉。 在本發明之一實施例中，當第一殼體的旋轉角度大於 上限值時’滑動件反向移動並卡合於第一轉軸的第一定位 部中。 在本發明之一實施例中，上述之滑動片之一端具有— 201033489 1 32230twf.d〇c/n 凸起部’而第-轉軸的第一定位部對應於凸起部設有一凹 孔，以使滑動片卡合於第一定位部中。 在本發明之-實施例中，上述之支標架具有二支樓臂 以及一連柃，二支撐臂藉由第二轉軸之兩端連接第二支 架，而連桿位於二支撐臂之間’並藉由第—轉軸連接第— 支架。 在本發明之一實施例中，上述之第二定位部配置於第 二支架上，並位於第二軸向上。 • 林發明之-實施例中，上述之滑動片於第二轴向上 設有一彈性件，以使滑動片朝第二軸向移動並卡合於第二 定位部中。 在本發明之一實施例中，上述之滑動片之一端具有— 卡塊，而第二定位部對應於卡塊設有一凹孔，以& 卡合於第二定位部中。 在本發明之一實施例中，上述之卡塊的尺寸與凹孔的 尺寸相配。 ^ • 在本發明之一實施例中，上述之卡塊的尺寸小於凹孔 的尺寸’且卡塊可於凹孔中滑動。 在本發明之一實施例中，上述之凹孔具有二斜面，且 呈V形。 在本發明之一實施例中’上述之下限值介於90度〜96 度之間。 & 在本發明之一實施例中，上述之上限值介於97度〜 108度之間。 又 5 201033489 TP2009011 32230twf.doc/n 基於上述，本發明藉由滑動片滑設於第一轉輛鱼 轉轴之間，並可卡合料-定位部或第二^位部中^ 當第一殼體在第二軸向上旋轉且旋轉角度小於 下限值 時 ，第-殼體無法在第-軸向上旋轉。當第—殼體的 角度大於下限值並小於-上限值時，第—殼體可在第 向上旋轉。 為讓本發明之上述特徵和優點能更明顯易懂，下 舉實施例，並配合所附圖式作詳細說明如下。 【實施方式】 圖2為本發明-實施例之電子裝置及其拖轴結構的配 置示意圖，_ 3A〜圖3C為圖2之樞轴結構的作動示意 圖。請參考11 2 ’電子裝置2〇〇例如是筆記型電腦，直& 括第一殼體202、第二殼體204以及一樞轴結構21〇。^一 殼體202可為上蓋，其具有一螢幕，❿第二殼體2〇4可為 主機，其具有一鍵盤以及位於主機内部的中央處理單元， 包括主機板、輸入/輸出模組、硬碟模組、記憶體模組、光 碟機模組、無線傳輸模組、喇ρ八接頭、耳機接頭等，皆為 常見的系統零組件，在此不再詳述。樞軸結構21〇連接於 第一殼體202與第二殼體204之間，以使第一殼體2〇2相 對於第二殼體204開啟或閉合。此外，當第一殼體2〇2開 啟至大於某個角度時，第一殼體2〇2可相對於第二殼體2〇4 在轴向Υ上水平旋轉，並使螢幕做180度之旋轉，使螢幕 之顯示面朝外。同時，本發明藉由滑動件23〇 (見圖3Α) 201033489 irxwyvil 32230twf.doc/n 之滑動及限位，以限制當第一殼體202的旋轉角度小於下 限值或大於上限值時’第一殼體202不能在軸向γ上水平 灰轉，以克服習知的螢幕常因開啟的角度不夠而碰撞到主 機，或是開啟的角度太大而碰撞到桌面。 請參考圖3A〜圖3C的樞轴結構，第—支架212固定 於圖2的第一殼體202 (螢幕）上，而第二支架214固定 於圖2的第二殼體204 (主機）上。第一轉軸216位於第 一軸向Y上，且第一轉軸216連接第一支架212，以使第 一殼體202支撐於第一轉軸216上，並可在第一轴向γ上 旋轉。此外，第一轉軸218位於第二轴向X上，且第二轉 軸218之兩端連接第二支架214之相對兩侧，以使第一殼 體202支撐於第二支架214上，並可在第二轴向χ上旋轉' 另外，支撐架220連接於第一轉軸216與第二轉軸218之 間，以使第一殼體202可在第一軸向γ或第二軸向χ上相 對於第二殼體204旋轉，其中第一軸向γ與第二軸向乂相 互垂直。 當第一殼體202閉合於第二殼體2〇4上時，請參考圖 从之拖軸結構’其表示第一殼體2〇2未旋轉時的初始位 置，旋轉角度設定為零。滑動片230卡合於該第—轉軸216 的第一定位部216Α中。舉例來說，滑動片23〇之一端具 有—凸起部230Α，而第一轉軸216的第一定位部216八對 應於凸起部230Α設有一凹孔。凸起部23〇Α與 相配，以使凸起部23GA能插人於凹孔中。因此 殼體202㈤合於第二殼體204或第-殼體202的旋二角度 201033489 32230twf.doc/n 大於下限值時’第一殼體202無法在第一軸向Υ上旋轉， 以避免第一殼體202因開啟的角度不夠而碰撞到第二殼體 204。下限值較佳介於9〇度〜96度之間。 接著’當第一殼體202的旋轉角度大於下限值並小於 一上限值時，請參考圖3Β之樞軸結構，其表示第一殼體 202的旋轉角度為下限值的位置，旋轉角度0 1例如是％ 度，但本發明不加以限制。此時，滑動片23〇朝第二軸向 X移動並卡合於一第二定位部214Α中，並解除滑動片230 與第一轉轴216之卡固。詳細而言，請參考圖3Β的局部 放大示意圖，第二定位部214Α配置於第二支架214上， 並位於第二軸向X上。滑動片230於第二轴向X上設有一 彈性件230Β，以使滑動片230朝第二轴向X移動並卡合 於第二定位部214Α中。彈性件230Β例如是彈簧、彈片或 彈性墊等。舉例而言，滑動片230之一端具有一卡塊 230C ’而第二定位部214Α對應於卡塊230C設有一凹孔， 且凹孔具有二斜面’例如呈V型斜面。藉由二斜面之作用， 可使卡塊230C沿著斜面滑入於凹孔中，亦可使卡塊23〇c 沿著斜面滑出於凹孔外。同時，藉由彈性件230B之作用， 滑動片230可在第二轴向X受力，以使卡塊230C在特定 的旋轉角度（例如96度左右）下恰好與凹孔相對應，並藉 由其彈力推動卡塊230C朝凹孔移動，進而將卡塊230C滑 入於凹孔中。 如上所述，卡塊230C與凹孔的形狀相配，但亦可卡 塊230C的尺寸較小，而凹孔的尺寸較大，如此卡塊23〇c 201〇33489ii 32230twfd〇c/n 能滑入於凹孔中，並可在凹孔中移動一行程。藉由上述的 設計’只要第一殼體202的旋轉角度大於下限值並小於一 上限值時，第一殼體202均能在第一軸向上水平旋轉。上 限值例如介於97度〜108度之間。此外，在另一實施例中， 當卡塊230C與凹孔的尺寸緊配時’卡塊230C將不會在凹 孔中移動，因此只要第一殼體202的旋轉角度大於特定值 時，卡塊230C將立即從凹孔中滑出。 请參考圖3C之樞軸結構及放大示意圖，其表示第一 籲 殼體202的旋轉角度大於上限值的位置，旋轉角度02例 如是108度，但本發明不加以限制。當第一殼體202在第 一軸向X上的旋轉角度大於上限值時，滑動件230的卡塊 230C不在凹孔中’而是抵接於凹孔的外側壁上。藉由抵接 的作用力來克服彈性件230B的彈力，滑動件230將反向 移動並回復至圖3A的初始位置，且滑動件230的凸起部 23〇A又再度卡合於第一轉軸216的第一定位部216A中。 此時，第一殼體202無法在第一軸向γ上水平旋轉，以避 • 免第一殼體2〇2因開啟的角度太大而碰撞到桌面。 請參考圖3B，在本實施例中，支撐架22〇具有二支撐 臂220A以及一連桿22〇B，而二支撐臂22〇A藉由第二轉 轴218之兩端連接第二支架214。連桿220B位於二支撐臂 220A之間’並藉由第一轉轴216連接第一支架212。但本 毛月不限疋支撐架220的外觀，其可依照外觀設計而改 變。同樣’滑動片230配置於支撐架220上，不限定為L 形’其可依照滑動方式而改變其形狀。 201033489 ir^uv7Ui 1 32230tw£doc/n 綜上所述，本發明的樞軸結構以第一轴轉連接第一殼 體上的第一支架，並以第二轉轴連接第二殼體上的第二支 架。此外，滑動片滑設於第一轉轴與第二轉軸之間，當第 一殼體在第二軸向上旋轉且旋轉角度小於一下限值時，滑 動片卡合於第一轉軸的第一定位部中，以使第一殼體無法 在第一軸向上旋轉’而當第一殼體的旋轉角度大於下限值 並小於一上限值時，滑動片朝第二軸向移動並卡合於一第 一疋位部中’並解除滑動片與第一轉軸之卡固，以使第一 殼體可在第一轴向上旋轉。因此，藉由滑動片的卡合與解 固’可克服習知的螢幕在做垂直轴向Y的旋轉時，因開啟 的角度不夠而碰撞到主機，或是開啟的角度太大而碰撞到 桌面，以確保螢幕不會碰撞到主機或桌面，進而提高產品 的使用壽命。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明，任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内，當可作些許之更動與潤飾，故本 發明之保護範圍當視後附之申請寻利範圍所界定者為準。 【圖式簡單說明】 圖1是習知一種雙向的樞軸結構的示意圖。 圖2為本發明一實施例之電子裝置及其樞軸結構的配 置示意圖。 圖3A〜圖3C為圖2之枢轴結構的作動示意圖。 201033489 11 厶i 1 32230twf.doc/n 【主要元件符號說明】 110:樞軸結構 112 :第一支架 114 :第二支架 116 :第一轉軸 118 :第二轉軸 120 :支撐架 Y:垂直軸向（第一軸向） X:水平軸向（第二軸向） ❹ 200 :電子裝置 202 :第一殼體 204 :第二殼體 210 :樞轴結構 212 :第一支架 214 :第二支架 214A :第二定位部 216 :第一轉軸 216A :第一定位部 ^ 218 :第二轉軸 ^ 220 :支撐架 220A :支撐臂 220B :連桿 230 :滑動片 230A :凸起部 230B :彈性件 230C :卡塊 0 1、02 :旋轉角度 11201033489 i rjLKjuyyj 11 32230twf.doc/n VI. Description of the invention: [Technical field of the invention] and ancient - a kind of structure, and especially related to an octagonal/monthly piece on the first-axis and the second axis The pivot structure between. [Prior Art] 电子 See the electronic products on the market, for example, in order to achieve the effect of opening and closing between the notes and the screen, a pivot is provided between the host and the screen to promote the money screen relative to the host. Features. In addition, the design of the pivot is no longer limited to the one-way deployment or closing action, but requires: ==5 to open to a certain angle, the screen can be rotated 180 degrees through the steering mechanism to make the display of the screen face outer. Therefore, there is a unidirectional pivot structure and a bidirectional pivot structure. Figure 1 shows a schematic diagram of a conventional two-way pivot structure applied to a notebook computer. Referring to FIG. 1, the pivot structure 11A has a first bracket 112, a second bracket 114, a first rotating shaft 116, a second rotating shaft 118, and a support frame 120. The first bracket 112 is locked to the screen, and the support frame 12 is coupled to the first bracket 112' by the first rotating shaft 116 to rotate the screen in a vertical axial direction relative to the main body. In addition, the second bracket 114 is locked to the main body, and the two ends of the gantry 120 are respectively connected to the second bracket 114 by the second rotating shaft jig so that the screen can be rotated horizontally X with respect to the main body. However, if the first rotating shaft 116 and the second rotating shaft 118 are in an infinite position to limit the driving relationship when the screen is rotated, the rotation of the screen on the first rotating shaft 116 and the second rotating shaft 118 is likely to be dangerous, especially when Screen at 201033489 lrzuuvuu 32230twf.doc/n How to (4) ^Axis Y rotation 'The screen often comes to the host due to the angle of opening, or the angle of opening is too large to hit the desktop. ^ and (4) to improve the above defects, is the focus of research and development of the invention. SUMMARY OF THE INVENTION The present invention provides a reduction mechanism, which improves the above-mentioned problems. The present invention proposes a pivot structure connected between the first housing fish J body, and the pivot structure includes a first bracket, a second bracket, Second = two second rotating shaft, support frame and sliding piece. The first bracket is fixed to the first housing. The second bracket is mounted on the second housing. The first-rotor is located in the first direction. The first-rotor is connected to the first bracket. The second rotating shaft is located in the second axial direction, and the two ends of the second rotating shaft are connected to opposite sides of the second bracket. The support frame is coupled between the first rotating shaft and the second rotating shaft to rotate the first housing relative to the second housing in the first axial direction or the second axial direction. The sliding piece is slidably disposed between the first rotating shaft and the second rotating shaft. When the first casing rotates in the second axial direction and the rotation angle is less than a lower limit, the sliding piece is engaged with the first rotating shaft. In the positioning portion, the first housing is prohibited from rotating in the first axial direction, and when the rotation angle of the first housing is greater than the lower limit value and less than an upper limit value, the sliding piece moves toward the second axial direction and is engaged with In a second positioning portion, the locking of the sliding piece and the first rotating shaft is released, so that the first housing can rotate in the first axial direction. In an embodiment of the invention, when the rotation angle of the first housing is greater than the upper limit value, the slider is reversely moved and engaged in the first positioning portion of the first shaft. In an embodiment of the present invention, one end of the sliding piece has -201033489 1 32230twf.d〇c/n convex portion' and the first positioning portion of the first rotating shaft is provided with a concave hole corresponding to the convex portion, The sliding piece is engaged in the first positioning portion. In the embodiment of the present invention, the above-mentioned subrack has two arm members and one flail, and the two support arms are connected to the second bracket by the two ends of the second rotating shaft, and the connecting rod is located between the two supporting arms. The first bracket is connected by the first shaft. In an embodiment of the invention, the second positioning portion is disposed on the second bracket and located in the second axial direction. In the embodiment of the invention, the sliding piece is provided with an elastic member in the second axial direction to move the sliding piece toward the second axial direction and to engage in the second positioning portion. In one embodiment of the present invention, one end of the sliding piece has a - block, and the second positioning portion is provided with a recess corresponding to the block, and is engaged with the second positioning portion. In one embodiment of the invention, the size of the block is matched to the size of the recess. ^ In an embodiment of the invention, the above-mentioned card block has a size smaller than the size of the recessed hole and the card block can slide in the recessed hole. In an embodiment of the invention, the recess has two bevels and is V-shaped. In an embodiment of the invention, the lower limit is between 90 and 96 degrees. & In an embodiment of the invention, the upper limit is between 97 degrees and 108 degrees. Further 5 201033489 TP2009011 32230twf.doc/n Based on the above, the present invention is slidably disposed between the first rotating fish shaft by the sliding piece, and can be engaged in the material-positioning portion or the second portion. When the housing rotates in the second axial direction and the rotation angle is less than the lower limit value, the first housing cannot rotate in the first axial direction. When the angle of the first housing is greater than the lower limit and less than the upper limit, the first housing can be rotated in the first direction. The above described features and advantages of the present invention will be more apparent from the following description. [Embodiment] FIG. 2 is a schematic view showing the configuration of an electronic device and a tow shaft structure according to the present invention, and FIG. 3A is a schematic diagram showing the operation of the pivot structure of FIG. Please refer to the 11 2 ' electronic device 2, for example, a notebook computer, which includes a first housing 202, a second housing 204, and a pivot structure 21A. A housing 202 can be an upper cover having a screen, and the second housing 2〇4 can be a mainframe having a keyboard and a central processing unit located inside the mainframe, including a motherboard, an input/output module, and a hard The disc module, the memory module, the optical disc drive module, the wireless transmission module, the ρ 八 connector, the earphone connector, etc. are all common system components, and will not be described in detail herein. The pivot structure 21 is coupled between the first housing 202 and the second housing 204 to open or close the first housing 2〇2 relative to the second housing 204. In addition, when the first housing 2〇2 is opened to be larger than a certain angle, the first housing 2〇2 can be horizontally rotated in the axial direction relative to the second housing 2〇4, and the screen is made 180 degrees. Rotate so that the display side of the screen faces outward. At the same time, the present invention limits the sliding and limiting of the sliding member 23〇 (see FIG. 3Α) 201033489 irxwyvil 32230twf.doc/n to limit when the rotation angle of the first housing 202 is less than the lower limit value or greater than the upper limit value. The first housing 202 cannot be horizontally grayed out in the axial direction γ to overcome the conventional screen often hitting the host due to insufficient opening angle, or the opening angle is too large to hit the table top. Referring to the pivot structure of FIG. 3A to FIG. 3C, the first bracket 212 is fixed to the first housing 202 (screen) of FIG. 2, and the second bracket 214 is fixed to the second housing 204 (host) of FIG. . The first rotating shaft 216 is located in the first axial direction Y, and the first rotating shaft 216 is coupled to the first bracket 212 such that the first housing 202 is supported on the first rotating shaft 216 and is rotatable in the first axial direction γ. In addition, the first rotating shaft 218 is located in the second axial direction X, and the two ends of the second rotating shaft 218 are connected to opposite sides of the second bracket 214, so that the first housing 202 is supported on the second bracket 214, and The second axial cymbal is rotated. In addition, the support frame 220 is coupled between the first rotating shaft 216 and the second rotating shaft 218, so that the first housing 202 can be opposite to the first axial γ or the second axial χ. The second housing 204 rotates, wherein the first axial direction γ and the second axial direction are perpendicular to each other. When the first casing 202 is closed on the second casing 2〇4, referring to the drawing from the trailing shaft structure 'which indicates the initial position when the first casing 2〇2 is not rotated, the rotation angle is set to zero. The sliding piece 230 is engaged in the first positioning portion 216 of the first rotating shaft 216. For example, one end of the sliding piece 23 has a convex portion 230, and the first positioning portion 216 of the first rotating shaft 216 corresponds to the convex portion 230 and is provided with a concave hole. The bosses 23 are matched to each other so that the bosses 23GA can be inserted into the recesses. Therefore, when the housing 202 (f) is combined with the second housing 204 or the second housing 204 or the first housing 202 has a rotation angle of 201033489 32230 twf.doc/n greater than the lower limit value, the first housing 202 cannot rotate on the first axial direction to avoid The first housing 202 collides with the second housing 204 due to insufficient opening angle. The lower limit is preferably between 9 and 96 degrees. Then, when the rotation angle of the first housing 202 is greater than the lower limit value and less than an upper limit value, please refer to the pivot structure of FIG. 3, which indicates the position where the rotation angle of the first housing 202 is the lower limit value, and the rotation The angle 0 1 is, for example, %, but the invention is not limited. At this time, the sliding piece 23 is moved toward the second axial direction X and is engaged with a second positioning portion 214, and the locking of the sliding piece 230 with the first rotating shaft 216 is released. In detail, referring to a partial enlarged view of FIG. 3A, the second positioning portion 214 is disposed on the second bracket 214 and located in the second axial direction X. The slider 230 is provided with a resilient member 230A in the second axial direction X to move the slider 230 toward the second axial direction X and to engage in the second positioning portion 214A. The elastic member 230 is, for example, a spring, a spring piece or an elastic pad or the like. For example, one end of the sliding piece 230 has a block 230C' and the second positioning part 214A is provided with a recess corresponding to the block 230C, and the recess has two slopes, for example, a V-shaped bevel. By the action of the two inclined surfaces, the block 230C can be slid into the concave hole along the inclined surface, and the block 23〇c can be slid out of the concave hole along the inclined surface. At the same time, by the action of the elastic member 230B, the sliding piece 230 can be forced in the second axial direction X so that the block 230C corresponds to the concave hole at a specific rotation angle (for example, about 96 degrees), and by The elastic force pushes the card block 230C toward the recessed hole, thereby sliding the block 230C into the recessed hole. As described above, the block 230C matches the shape of the recessed hole, but the size of the block 230C is also small, and the size of the recessed hole is large, so that the block 23〇c 201〇33489ii 32230twfd〇c/n can slide in In the recessed hole, a stroke can be moved in the recessed hole. With the above design, the first housing 202 can be horizontally rotated in the first axial direction as long as the rotation angle of the first housing 202 is greater than the lower limit value and smaller than an upper limit value. The upper limit value is, for example, between 97 degrees and 108 degrees. In addition, in another embodiment, when the block 230C is closely matched with the size of the recessed hole, the 'block 230C will not move in the recessed hole, so as long as the rotation angle of the first housing 202 is greater than a specific value, the card Block 230C will immediately slide out of the recess. Please refer to the pivot structure and enlarged schematic view of FIG. 3C, which shows the position where the rotation angle of the first appeal housing 202 is greater than the upper limit value, and the rotation angle 02 is, for example, 108 degrees, but the invention is not limited thereto. When the rotation angle of the first housing 202 in the first axial direction X is greater than the upper limit value, the slider 230C of the slider 230 does not lie in the recessed hole but abuts against the outer side wall of the recessed hole. By the abutting force to overcome the elastic force of the elastic member 230B, the sliding member 230 will move in the opposite direction and return to the initial position of FIG. 3A, and the convex portion 23A of the sliding member 230 is again engaged with the first rotating shaft. The first positioning portion 216A of the 216 is. At this time, the first casing 202 cannot be horizontally rotated in the first axial direction γ to avoid the first casing 2〇2 from colliding with the tabletop due to the angle of opening. Referring to FIG. 3B, in the embodiment, the support frame 22 has two support arms 220A and a link 22B, and the two support arms 22A are connected to the second bracket 214 by the two ends of the second shaft 218. . The link 220B is located between the two support arms 220A and is coupled to the first bracket 212 by the first rotating shaft 216. However, this month is not limited to the appearance of the support frame 220, which may be changed according to the design. Similarly, the sliding piece 230 is disposed on the support frame 220, and is not limited to an L-shape, which can change its shape in accordance with the sliding mode. 201033489 ir^uv7Ui 1 32230tw£doc/n In summary, the pivot structure of the present invention is connected to the first bracket on the first housing by the first shaft, and is connected to the second housing by the second rotating shaft. Second bracket. In addition, the sliding piece is slidably disposed between the first rotating shaft and the second rotating shaft, and when the first housing rotates in the second axial direction and the rotation angle is less than a lower limit value, the sliding piece is engaged with the first positioning of the first rotating shaft In the portion, so that the first housing cannot rotate in the first axial direction, and when the rotation angle of the first housing is greater than the lower limit value and less than an upper limit value, the sliding piece moves toward the second axial direction and is engaged with In a first clamping portion, the clamping of the sliding piece and the first rotating shaft is released, so that the first housing can rotate in the first axial direction. Therefore, by the engagement and disassembly of the sliding sheet, it is possible to overcome the conventional screen when the vertical axis Y is rotated, and the host is hit by the insufficient angle of opening, or the angle of opening is too large to collide with the desktop. To ensure that the screen does not hit the host or the desktop, thereby increasing the life of the product. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of protection of the present invention is subject to the definition of the scope of the application for profit. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a conventional bidirectional pivot structure. 2 is a schematic view showing the arrangement of an electronic device and a pivot structure thereof according to an embodiment of the present invention. 3A to 3C are schematic views showing the operation of the pivot structure of Fig. 2. 201033489 11 厶i 1 32230twf.doc/n [Description of main component symbols] 110: Pivot structure 112: First bracket 114: Second bracket 116: First shaft 118: Second shaft 120: Support frame Y: Vertical axis (first axial direction) X: horizontal axial direction (second axial direction) ❹ 200: electronic device 202: first housing 204: second housing 210: pivot structure 212: first bracket 214: second bracket 214A : second positioning portion 216 : first rotating shaft 216A : first positioning portion ^ 218 : second rotating shaft ^ 220 : support frame 220A : support arm 220B : connecting rod 230 : sliding piece 230A : convex portion 230B : elastic member 230C : Block 0 1, 02: rotation angle 11