201021672 -九、發明說明： .【發明所屬之技術領域】 本發明涉及一種鉸鏈結構，尤其係關於一種用於電子 裝置之鉸鏈結構。 【先前技術】 筆記型電腦等電子裝置一般包括一本體與一蓋體，顯 示幕設於蓋體上，為使顯示幕具有較佳視角，通常需要藉 由鉸鏈結構將蓋體可旋轉地連接至本體上。 ❿ 一種鉸鏈結構包括一轉軸、一主構件及一可與主構件 樞轉配合之樞轉件。主構件不可相對於轉軸旋轉，樞轉件 可相對於轉軸旋轉。主構件包括一彈簧與一主凸輪件，主 凸輪件之側面上設置有至少一凸出部與一凹陷部，凸出部 與凹陷部之間為一斜面。樞轉件包括一樞轉凸輪件，樞轉 凸輪件之側面上對應於主凸輪件設置有至少一凹陷部與一 凸出部，凹陷部與凸出部之間亦為一斜面。 此鉸鏈結構應用於電子裝置時，藉由主凸輪件與樞轉 v凸輪件上之凸出部與凹陷部之配合，可使電子裝置蓋體定 位於特定位置。且於電子裝置關閉之過程中，當鉸鏈結構 被手動關閉到一定位置時，樞轉凸輪件之斜面與主凸輪件 之斜面相貼合，於彈簧之彈力作用下，樞轉凸輪件之凸出 部開始自動沿著主凸輪件之斜面下滑並進入主凸輪件之凹 陷部中，從而使電子裝置蓋體自動關閉。 然而，上述鉸鏈結構存在以下問題：如果主凸輪件與 樞轉凸輪件之斜面設計較陡，樞轉凸輪件之凸出部將以較 201021672 之白於主凸輪件之凹陷部中’導致電子裝置蓋體 .2= 度很快，易對顯示幕造成震蕩與衝擊。如果 主凸輪件與樞轉凸輪件之斜面設計較平緩，電子裝置蓋體 之關閉速度將較慢甚至盈法完全白叙鬥入 衮置盍體 時，蓋體與太…3 合。且於關閉狀態 I iff 預緊力較小’蓋體之合緊狀態不穩 疋易自動彈開，從而造成使用不便。 【發明内容】 ©㈣馨於以上内容’有必要提供—種自鎖速度合理、手感 舒適’且不易損傷顯示幕、合緊狀態穩^之鉸鍵結構。 一種鉸鏈結構，包括樞轴、旋轉支架、固定支架、固 位件及雜件，㈣敎架及定位件與該樞軸為 =可轉動連接’該固定支架及固定件與該樞軸為可轉動連 2該固定件與該固定支架固定連接，該彈性件穿設於該 ，軸上提供轴向力’該固定件與定位件之其中一個設置有 定位凸起，另一個相應設置有與該定位凸起相配合之定位 ❹凹槽’該定位凹槽之槽壁由相互連接之第一斜面與第二斜 面構成’該第二斜面與定位凹槽之槽底相鄰，且相對於定 位凹槽之槽底所在之平面，該第一斜面之斜率小於第二斜 面之斜率。 •另一種鉸鏈結構，其與上述鉸鏈結構之不同之處在 於：該定位凸起之侧壁由相互連接之第—斜面與第二斜面 構成’該第-斜©與定位凸起之頂表面相鄰，且相對於定 位凸起之頂表面所在之平面，該第一斜面之斜率小於第二 斜面之斜率。 9 201021672 上述鼓鍵結構可應用於電子裝置中，當電子芽置關閉 •至一定角度時，定位凸起可自動滑入定位凹槽中，使電子 裝置之蓋體自動關閉。於自動關閉過程中，定位凸起首先 與定位凹槽之第一斜面相配合’或定位凸起之第一斜面首 先與定位凹槽相配合，由於第一斜面斜率較小，可起到緩 衝作用’而使蓋體緩慢向下關閉，避免對顯示幕造成震蕩 與衝擊。隨後定位凸起將與定位凹槽之第二斜面相配合， 或定位凸起之第二斜面將與定位凹槽相配合，由於第二斜 ❹面斜率較大，定位凸起將迅速滑入定位凹槽内，使得蓋體 於關閉之瞬間以較快速度與本體貼合，避免蓋體無法完全 自動閉合之現象。且於關閉狀態時，由於第二斜面斜=二 大’定位凸起可較穩固地卡合於定位凹槽内，使得蓋體之 合緊狀態穩定，不易自動彈開。故，上述鉸鏈結構具有自 鎖速度合理、手感舒適，且不易損傷顯示幕、合緊狀態穩 定之有益效果。 ‘"'Μ 〇【實施方式】 下面將結合附圖及較佳實施例對本發明之鉸鏈結構作 進一步詳細說明。 請同時參見圖1至圖3,較佳實施例一之鉸鏈結構1〇 包括一樞軸11、一旋轉支架12、一固定支架13、一固定件 14、一定位件15、一限位元件16、一彈性件17、二摩擦片 18、一墊片19以及一鎖合件1〇卜其中旋轉支架12、^位 件15與限位件16與樞軸u為非可轉動連接，固定支架Η 與固定件14與樞轴11為可轉動連接。 201021672 ' 樞軸11之橫截面為非圓形，其一端形成有一圓柱狀凸 «緣111，另一端形成有一螺紋部112。柩軸11形成凸緣111 之一端進一步凸伸出凸緣111外以形成一插接部113,插接 部113之橫截面亦為非圓形。 旋轉支架12包括一基板121，其上開設有複數固定孔 1211，用於將旋轉支架12固定至電子裝置蓋體上。基板121 之一側垂直向上延伸而形成一定位板122,該定位板122 上開設有一與樞轴11配合之非圓變形孔1221。 ® 固定支架13包括一固定板131及一由固定板131 —側 垂直延伸形成之支撐板132。固定板131上開設有複數固定 孔1311，用於將固定支架13固定至電子裝置本體上。支撐 板132遠離固定板131之端部開設有一枢轉孔1321，中部 開設有一卡合孔1322。樞轉孔1321之週圍還設置有一限位 凸起1323及若干油槽1324。 固定件14大致為扇形，其中心開設有一圓形軸孔 ❹141。固定件14之端部向外凸伸形成一凸柱142。固定件 14之一側面上形成有二定位凸起143，定位凸起143之兩 侧之侧壁均為一斜面。 定位件15大致為圓柱狀，其中心開設有一非圓變形孔 151。定位件15與固定件14相對之一侧面150上形成有二 定位凹槽152,定位凹槽152可與固定件14之定位凸起143 相配合。定位凹槽152兩侧之槽壁分別由相互連接之第一 斜面1521、第二斜面I522構成，策一斜面1521與侧面15〇 相接，第二斜面1522與定位凹槽152之槽底相接，且相對 11 201021672 -·於定位凹槽152之槽底所在之平面，第一斜面1521之斜率 «小於第二斜面1522之斜率。 限位件16大致為圓片狀，其中心開設有一非圓變形孔 161。限位件16之週緣向外凸伸形成一凸耳162，凸耳162 之兩側分別形成二限位端1621、1622。 彈性件17為複數碟形彈片疊合而成之彈片組，彈性件 17還可為彈簧等其他彈性元件。 摩擦片18之中心開設有一圓形通孔181，側面上開設 ®有複數油槽182。 墊片19之中心開設有一非圓變形孔191。 鎖合件101為一與樞轴11之螺紋部112相配合之螺母。 請同時參見圖1至圖4,裝配該鉸鏈結構10時，將樞 軸11具有螺紋部112之一端穿過一摩擦片18之圓形通孔 181、限位件16之非圓變形孔161、固定支架13之樞轉孔 1321、另一摩擦片18之圓形通孔181、固定件14之軸孔 _141、定位件15之非圓變形孔151、彈性件17以及墊片19 之非圓變形孔191後，與鎖合件101相螺合。同時，固定 件14上之凸柱142卡入固定支架13上之卡合孔1322中； 定位件15與固定件14相貼合，且固定件14上之定位凸起 143相應容納於定位件15上之定位凹槽152内。然後，將 樞軸11之插接部113卡入旋轉支架12之非圓變形孔1221 中即可。 鉸鏈結構10應用於電子裝置時，其旋轉支架12及固 定支架13分別與電子裝置之蓋體及本體相連即可。打開電 12 201021672 -·子裝置時，對蓋體施力，從而推動旋轉支架12之基板121 *旋轉，樞軸11將於旋轉支架12之帶動下旋轉，並帶動樞 軸11上之定位件15旋轉，固定件14之定位凸起143將從 定位件15之定位凹槽152中滑出，彈性件17被壓縮而產 生轴向力，使得各元件之間緊密接觸。當蓋體被旋轉至特 定位置時，停止對其施力，旋轉支架12將於各元件摩擦力 作用下定位，從而使蓋體定位於特定位置。 關閉電子裝置時，對蓋體施力，從而推動旋轉支架12 ❹之基板121沿反方向旋轉，樞軸11及定位件15被帶動而 一同旋轉，固定件14之定位凸起143將逐漸接近定位件15 之定位凹槽152。當蓋體被手動關閉至一定角度時，固定件 14之定位凸起143將於彈性件17所提供之軸向力作用下， 自動滑入定位件15之定位凹槽152中，而使蓋體自動關閉。 請同時參見圖5與圖6,於蓋體自動關閉之過程中，固 定件14之定位凸起143首先與定位件15之定位凹槽152 ◎之第一斜面1521相接觸。此時，定位凸起143開始進入定 位凹槽152内，彈性件17之壓縮量減少，其產生之軸向力 減小，從而使各元件之間之摩擦力矩減小。當蓋體之重力 力矩大於各元件之摩擦力矩時，蓋體開始自動關閉。由於 第一斜面1521之斜率較小，彈性件17之壓縮量緩慢地略 微減少，使蓋體之重力力矩略微大於各元件之摩擦力矩， 從而使得蓋體緩慢向下關閉。當蓋體關閉至即將與本體貼 合時，定位凸起143與定位凹槽152之第二斜面1522相接 觸，由於第二斜面1522之斜率較大，定位凸起143將迅速 13 201021672 -·滑入定位凹槽152内，使得蓋體以較快之速度與本體貼合。 •藉由對第一、第二斜面1521、1522長度之限定，可限定蓋 體相對於本體自動關閉之角度。優選地，第一、第二斜面 1521、1522之長度限定為可使蓋體相對於本體呈10度角時 開始自動緩慢關閉，呈2度角時迅速合緊。另，定位凹槽 152還可設置於固定件14上，此時定位凸起143需相應設 置於定位件15上。 上述鉸鏈結構10於使用之過程中，可實現自動關閉時 ®先慢後快之趨勢，藉由定位件15之定位凹槽152之第一斜 面1521之緩衝作用，避免蓋體自動關閉速度過快，而對顯 示幕造成震蕩與衝擊。同時定位件15之定位凹槽152之第 二斜面1522使得蓋體於關閉之瞬間以較快速度與本體貼 合，避免蓋體無法完全自動閉合之現象。由於此快速關閉 之角度很小，力度亦很小，不會對顯示幕造成震蕩與衝擊。 且於關閉狀態時，由於第二斜面1522斜率較大，定位凸起 & 143可較穩固地卡合於定位凹槽152内，使得蓋體之合緊狀 態穩定，不易自動彈開。故，鉸鏈結構10具有自鎖速度合 理、手感舒適，且不易損傷顯示幕、合緊狀態穩定之有益 效果。 另，鉸鏈結構10於關閉狀態時，限位件16之限位端 1621與固定支架13之限位凸起1323相抵，鉸鏈結構10 打開至最大角度時，限位件16之限位端1622與固定支架 13之限位凸起1323相抵，從而可限定旋轉支架12相對於 固定支架13之轉動角度範圍。 14 201021672 請參見圖7，本發明較佳實施例二之鉸鏈結構20與較 -佳實施例一之较鏈結構10相似，不同之處在於：固定件24 之侧面240上形成有二定位凸起243。定位凸起243兩側之 側壁分別由相互連接之第一斜面2431、第二斜面2432構 成，第一斜面2431與定位凸起243之頂表面相接，第二斜 面2432與侧面240相接，且相對於定位凸起243之頂表面 所在之平面，第一斜面2431之斜率小於第二斜面2432之 斜率。定位件25上對應形成有可與定位凸起243配合之二 ❹定位凹槽252，定位凹槽252兩側之槽壁均為一斜面。 蓋體自動關閉之過程中，定位凸起243之第一斜面 2431首先與定位凹槽252配合，由於第一斜面2431斜率較 小，可起到緩衝作用，使蓋體緩慢向下關閉，隨後定位凸 起243之第二斜面2432將與定位凹槽252配合，由於第二 斜面2432斜率較大，定位凸起243將迅速滑入定位凹槽252 内，使得蓋體以較快之速度與本體貼合。 ^ 另，定位凸起243還可設置於定位件25上，此時定位 凹槽252需相應設置於固定件24上。定位凸起143、243 及定位凹槽152、252之數量不限於二，還可為一、三或四 等。定位凹槽152之第一斜面1521與侧面150不限於直接 相接，還可通過一較小之圓弧面過渡，第二斜面1522與定 位凹槽152之槽底亦可藉由一較小之圓弧面過渡。定位凸 起243之第一斜面2431與定位凸起243之頂表面以及第二 斜面2432與側面240亦可藉由一較小之圓弧面過渡。 綜上所述，本發明確已符合發明專利之要件，遂依法 15 201021672 --提出專利申請。惟，以上所述者僅為本發明之較佳實施方 ，式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明較佳實施例一之鉸鏈結構之立體分解圖。 圖2係圖1所示鉸鏈結構之定位件之立體圖。 圖3係圖1所示鉸鏈結構另一視角之立體分解圖。 ® 圖4係圖1所示鉸鏈結構之組裝圖。 圖5係圖1所示鉸鏈結構之定位件之第一斜面與固定 件之定位凸起之配合示意圖。 圖6係圖1所示鉸鏈結構之定位件之第二斜面與固定 件之定位凸起之配合示意圖。 圖7係本發明較佳實施例二之鉸鏈結構之定位件之定 位凹槽與固定件之定位凸起之配合示意圖。 _【主要元件符號說明】 鉸鏈結構 10，20 樞軸 11 凸緣 111 螺紋部 112 插接部 113 旋轉支架 12 基板 121 定位板 122 固定孔 1211 非圓變形孔 1221 固定支架 13 固定板 131 支樓板 132 固定孔 1311 樞轉孔 1321 卡合孔 1322 16 201021672 •-限位凸起 1323 *固定件 14，24 凸柱 142 側面 240 側面 150 定位凹槽 152 ， 252 第二斜面 1522 ， 2432 非圓變形孔 161 ®第一限位端 1621 彈性件 17 通孔 181 墊片 19 鎖合件 101 油槽 1324 軸孔 141 定位凸起 143 ， 243 定位件 15，25 非圓變形孔 151 第一斜面 1521 ， 2431 限位件 16 凸耳 162 第二限位端 1622 摩擦片 18 油槽 182 非圓變形孔 191 〇 17BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge structure, and more particularly to a hinge structure for an electronic device. [Prior Art] An electronic device such as a notebook computer generally includes a body and a cover. The display screen is disposed on the cover. In order to provide a better viewing angle of the display screen, the cover body is generally rotatably connected to the cover structure by a hinge structure. On the body.铰 A hinge structure includes a rotating shaft, a main member and a pivoting member pivotally coupled to the main member. The main member is not rotatable relative to the axis of rotation and the pivot member is rotatable relative to the axis of rotation. The main member includes a spring and a main cam member. The side surface of the main cam member is provided with at least one protruding portion and a concave portion, and a slope is formed between the protruding portion and the concave portion. The pivoting member includes a pivoting cam member. The side of the pivoting cam member is provided with at least one recessed portion and a protruding portion corresponding to the main cam member, and a slope is also formed between the recessed portion and the protruding portion. When the hinge structure is applied to an electronic device, the electronic device cover can be positioned at a specific position by the cooperation of the projections and the recesses on the main cam member and the pivoting cam member. And in the process of closing the electronic device, when the hinge structure is manually closed to a certain position, the inclined surface of the pivoting cam member is in conformity with the inclined surface of the main cam member, and the pivoting cam member protrudes under the elastic force of the spring. The portion begins to automatically slide down the slope of the main cam member and into the recess of the main cam member, thereby automatically closing the electronic device cover. However, the above hinge structure has the following problem: if the bevel design of the main cam member and the pivot cam member is steep, the projection of the pivot cam member will be in the recess of the main cam member in comparison with 201021672, resulting in an electronic device. The cover body.2= is very fast, which is easy to cause shock and impact on the display screen. If the design of the inclined surface of the main cam member and the pivoting cam member is relatively gentle, the closing speed of the electronic device cover body will be slower or even when the full-scale method is fully inserted into the body, the cover body is combined with the sun. In the closed state, I iff pre-tightening force is small. 'The tightness of the cover body is unstable. It is easy to bounce off automatically, which causes inconvenience in use. SUMMARY OF THE INVENTION © (4) Xin is in the above content 'it is necessary to provide a kind of hinge structure which is reasonable in self-locking speed and comfortable in hand' and is not easy to damage the display screen and is in a tight state. A hinge structure includes a pivot shaft, a rotating bracket, a fixing bracket, a retaining member and a miscellaneous member, and (4) the truss and the positioning member and the pivot shaft are rotatably connected. The fixing bracket and the fixing member and the pivot shaft are rotatable The fixing member is fixedly connected to the fixing bracket, and the elastic member is disposed on the shaft to provide an axial force. The one of the fixing member and the positioning member is provided with a positioning protrusion, and the other is correspondingly disposed with the positioning. Positioning the groove corresponding to the protrusion ' The groove wall of the positioning groove is formed by the first inclined surface and the second inclined surface which are connected to each other. The second inclined surface is adjacent to the groove bottom of the positioning groove, and is opposite to the positioning groove The plane of the bottom of the groove, the slope of the first slope is smaller than the slope of the second slope. Another hinge structure which is different from the above-mentioned hinge structure in that the side wall of the positioning protrusion is constituted by the first inclined surface and the second inclined surface which are connected to each other, and the top surface of the positioning protrusion and the positioning protrusion are Adjacent, and the plane of the first slope is smaller than the slope of the second slope relative to the plane of the top surface of the positioning protrusion. 9 201021672 The above drum key structure can be applied to an electronic device. When the electron bud is closed to a certain angle, the positioning protrusion can automatically slide into the positioning groove to automatically close the cover of the electronic device. During the automatic closing process, the positioning protrusion first cooperates with the first inclined surface of the positioning groove or the first inclined surface of the positioning protrusion cooperates with the positioning groove first, and the buffering effect is provided because the slope of the first inclined surface is small. 'And the cover body is slowly closed downwards to avoid shock and impact on the display screen. Then the positioning protrusion will cooperate with the second inclined surface of the positioning groove, or the second inclined surface of the positioning protrusion will cooperate with the positioning groove, and the positioning protrusion will slide into the positioning rapidly due to the large slope of the second inclined surface. In the groove, the cover body is attached to the body at a faster speed at the moment of closing, so that the cover body cannot be completely closed automatically. In the closed state, since the second inclined surface is inclined to be two large, the positioning protrusion can be relatively firmly engaged in the positioning groove, so that the tightness of the cover body is stable and it is not easy to automatically bounce. Therefore, the above hinge structure has the advantages of reasonable self-locking speed, comfortable hand feeling, and is not easy to damage the display screen and the state of the tightness is stable. ‘"'Μ 〇 [Embodiment] The hinge structure of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. Referring to FIG. 1 to FIG. 3 , the hinge structure 1 of the first embodiment includes a pivot 11 , a rotating bracket 12 , a fixing bracket 13 , a fixing component 14 , a positioning component 15 , and a limiting component 16 . , an elastic member 17 , two friction plates 18 , a spacer 19 , and a locking member 1 , wherein the rotating bracket 12 , the position member 15 and the limiting member 16 are non-rotatably connected with the pivot u, and the fixing bracket Η The fixing member 14 and the pivot shaft 11 are rotatably connected. 201021672 'The pivot 11 has a non-circular cross section, and has a cylindrical convex edge 111 at one end and a threaded portion 112 at the other end. One end of the flange 11 forming the flange 111 further protrudes outside the flange 111 to form a plug portion 113, and the cross section of the plug portion 113 is also non-circular. The rotating bracket 12 includes a base plate 121 having a plurality of fixing holes 1211 for fixing the rotating bracket 12 to the cover of the electronic device. One side of the substrate 121 extends vertically upward to form a positioning plate 122. The positioning plate 122 defines a non-circular deformation hole 1221 that cooperates with the pivot shaft 11. The fixing bracket 13 includes a fixing plate 131 and a supporting plate 132 formed by a vertical extension of the fixing plate 131. The fixing plate 131 is provided with a plurality of fixing holes 1311 for fixing the fixing bracket 13 to the electronic device body. A pivot hole 1321 is defined in an end portion of the support plate 132 away from the fixing plate 131, and an engaging hole 1322 is defined in the middle portion. A limiting protrusion 1323 and a plurality of oil grooves 1324 are further disposed around the pivot hole 1321. The fixing member 14 is substantially fan-shaped, and has a circular shaft hole 141 in the center thereof. The end of the fixing member 14 protrudes outward to form a protrusion 142. Two positioning protrusions 143 are formed on one side of the fixing member 14, and the side walls on both sides of the positioning protrusion 143 are all inclined surfaces. The positioning member 15 is substantially cylindrical and has a non-circular deformation hole 151 at the center thereof. Two positioning grooves 152 are formed on one side 150 of the positioning member 15 and the fixing member 14. The positioning grooves 152 can cooperate with the positioning protrusions 143 of the fixing member 14. The groove walls on both sides of the positioning groove 152 are respectively formed by a first inclined surface 1521 and a second inclined surface I522 which are connected to each other. The inclined surface 1521 is in contact with the side surface 15〇, and the second inclined surface 1522 is connected to the bottom of the positioning groove 152. And, relative to 11 201021672 - the plane of the first slope 1521 is smaller than the slope of the second slope 1522 on the plane of the groove bottom of the positioning groove 152. The stopper 16 is substantially in the shape of a disk, and a non-circular deformation hole 161 is formed in the center thereof. The periphery of the limiting member 16 protrudes outwardly to form a lug 162. The two sides of the lug 162 respectively define two limiting ends 1621 and 1622. The elastic member 17 is a group of elastic sheets in which a plurality of disc-shaped elastic sheets are stacked, and the elastic member 17 may be other elastic members such as springs. A circular through hole 181 is defined in the center of the friction plate 18, and a plurality of oil grooves 182 are formed on the side surface. A non-circular deformation hole 191 is formed in the center of the spacer 19. The locking member 101 is a nut that cooperates with the threaded portion 112 of the pivot shaft 11. Referring to FIG. 1 to FIG. 4 , when the hinge structure 10 is assembled, the pivot shaft 11 has one end of the threaded portion 112 passing through a circular through hole 181 of a friction plate 18 , and a non-circular deformation hole 161 of the limiting member 16 . The pivot hole 1321 of the fixing bracket 13 , the circular through hole 181 of the other friction plate 18 , the shaft hole _141 of the fixing member 14 , the non-circular deformation hole 151 of the positioning member 15 , the elastic member 17 and the non-circular shape of the spacer 19 After the deformation hole 191 is deformed, it is screwed with the lock member 101. At the same time, the protrusions 142 of the fixing member 14 are engaged in the engaging holes 1322 of the fixing bracket 13; the positioning member 15 is engaged with the fixing member 14, and the positioning protrusions 143 on the fixing member 14 are correspondingly received in the positioning member 15 The upper positioning groove 152 is located. Then, the insertion portion 113 of the pivot shaft 11 is engaged in the non-circular deformation hole 1221 of the rotary bracket 12. When the hinge structure 10 is applied to an electronic device, the rotating bracket 12 and the fixing bracket 13 are respectively connected to the cover body and the body of the electronic device. When the electric device 12 201021672 - sub-device is turned on, the cover body is biased to push the base plate 121 of the rotating bracket 12 to rotate, and the pivot shaft 11 is rotated by the rotating bracket 12 to drive the positioning member 15 on the pivot shaft 11. Rotating, the positioning projection 143 of the fixing member 14 will slide out of the positioning groove 152 of the positioning member 15, and the elastic member 17 is compressed to generate an axial force so that the respective members are in close contact. When the cover is rotated to a specific position, the force is stopped, and the rotating bracket 12 is positioned under the frictional force of each element to position the cover at a specific position. When the electronic device is turned off, the cover body is biased to push the base plate 121 of the rotating bracket 12 to rotate in the opposite direction, the pivot shaft 11 and the positioning member 15 are driven to rotate together, and the positioning protrusion 143 of the fixing member 14 is gradually approached and positioned. The positioning groove 152 of the piece 15. When the cover body is manually closed to a certain angle, the positioning protrusion 143 of the fixing member 14 automatically slides into the positioning groove 152 of the positioning member 15 under the axial force provided by the elastic member 17, so that the cover body Automatically shut down. Referring to FIG. 5 and FIG. 6 simultaneously, during the automatic closing of the cover body, the positioning protrusion 143 of the fixing member 14 first contacts the first inclined surface 1521 of the positioning groove 152 of the positioning member 15. At this time, the positioning projection 143 starts to enter the positioning recess 152, and the amount of compression of the elastic member 17 is reduced, and the axial force generated therefrom is reduced, so that the frictional torque between the elements is reduced. When the gravity moment of the cover is greater than the friction torque of each component, the cover begins to automatically close. Since the slope of the first slope 1521 is small, the amount of compression of the elastic member 17 is slowly reduced slightly, so that the gravitational moment of the cover body is slightly larger than the frictional moment of each element, so that the cover body is slowly closed downward. When the cover body is closed to be attached to the body, the positioning protrusion 143 is in contact with the second inclined surface 1522 of the positioning groove 152. Since the slope of the second inclined surface 1522 is large, the positioning protrusion 143 will be rapidly 13 201021672 -·slip The positioning groove 152 is inserted into the positioning groove 152 so that the cover body fits the body at a relatively fast speed. • By defining the length of the first and second ramps 1521, 1522, the angle at which the cover automatically closes relative to the body can be defined. Preferably, the lengths of the first and second slopes 1521, 1522 are defined such that the lid body can be automatically and slowly closed when it is at an angle of 10 degrees with respect to the body, and is quickly tightened at an angle of 2 degrees. In addition, the positioning groove 152 can also be disposed on the fixing member 14, and the positioning protrusion 143 is disposed on the positioning member 15 correspondingly. During the use of the hinge structure 10, the tendency of the first slow and fast speed can be realized when the automatic closing is performed, and the buffering action of the first inclined surface 1521 of the positioning groove 152 of the positioning member 15 prevents the automatic closing speed of the cover from being too fast. And the shock and impact on the display screen. At the same time, the second inclined surface 1522 of the positioning groove 152 of the positioning member 15 allows the cover body to be attached to the body at a faster speed at the moment of closing, thereby preventing the cover body from being completely automatically closed. Since the angle of this quick closing is small, the force is small, and the display screen is not oscillated and impacted. In the closed state, because the slope of the second inclined surface 1522 is large, the positioning protrusions & 143 can be relatively firmly engaged in the positioning groove 152, so that the tightness of the cover body is stable and it is not easy to automatically bounce. Therefore, the hinge structure 10 has the advantages of reasonable self-locking speed, comfortable hand feeling, and is not easy to damage the display screen and the state of being tight. In addition, when the hinge structure 10 is in the closed state, the limiting end 1621 of the limiting member 16 abuts against the limiting protrusion 1323 of the fixing bracket 13 , and when the hinge structure 10 is opened to the maximum angle, the limiting end 1622 of the limiting member 16 is The limiting protrusion 1323 of the fixing bracket 13 abuts, so that the range of the rotation angle of the rotating bracket 12 relative to the fixing bracket 13 can be defined. 14 201021672 Referring to FIG. 7, the hinge structure 20 of the preferred embodiment 2 of the present invention is similar to the chain structure 10 of the first preferred embodiment, except that two side positioning protrusions are formed on the side surface 240 of the fixing member 24. 243. The sidewalls on both sides of the positioning protrusion 243 are respectively formed by a first inclined surface 2431 and a second inclined surface 2432 which are connected to each other. The first inclined surface 2431 is in contact with the top surface of the positioning protrusion 243, and the second inclined surface 2432 is connected to the side surface 240, and The slope of the first slope 2431 is smaller than the slope of the second slope 2432 with respect to the plane of the top surface of the positioning protrusion 243. A positioning groove 252 is formed on the positioning member 25 to be engaged with the positioning protrusion 243. The groove walls on both sides of the positioning groove 252 are both inclined surfaces. During the automatic closing of the cover body, the first inclined surface 2431 of the positioning protrusion 243 first cooperates with the positioning groove 252. Since the slope of the first inclined surface 2431 is small, the buffering function can be buffered, and the cover body is slowly closed downward, and then positioned. The second inclined surface 2432 of the protrusion 243 will cooperate with the positioning groove 252. Since the slope of the second inclined surface 2432 is large, the positioning protrusion 243 will quickly slide into the positioning groove 252, so that the cover body is attached to the body at a relatively fast speed. Hehe. Further, the positioning protrusion 243 can also be disposed on the positioning member 25, and the positioning groove 252 is correspondingly disposed on the fixing member 24. The number of the positioning projections 143, 243 and the positioning grooves 152, 252 is not limited to two, and may be one, three or four. The first inclined surface 1521 of the positioning groove 152 and the side surface 150 are not limited to being directly connected, and may also be transitioned through a small circular arc surface. The bottom of the second inclined surface 1522 and the positioning groove 152 may also be replaced by a smaller one. Circular surface transition. The first inclined surface 2431 of the positioning protrusion 243 and the top surface of the positioning protrusion 243 and the second inclined surface 2432 and the side surface 240 may also be transitioned by a small circular arc surface. In summary, the present invention has indeed met the requirements of the invention patent, 遂 legally 15 201021672 - filed a patent application. However, the above description is only a preferred embodiment of the present invention, and the scope of the patent application of the present invention cannot be limited thereby. Equivalent modifications or variations made by persons skilled in the art in light of the present invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a hinge structure according to a preferred embodiment of the present invention. Figure 2 is a perspective view of the positioning member of the hinge structure shown in Figure 1. 3 is an exploded perspective view of another perspective view of the hinge structure shown in FIG. 1. ® Figure 4 is an assembled view of the hinge structure shown in Figure 1. Fig. 5 is a schematic view showing the cooperation of the first inclined surface of the positioning member of the hinge structure shown in Fig. 1 and the positioning protrusion of the fixing member. Fig. 6 is a schematic view showing the cooperation of the second inclined surface of the positioning member of the hinge structure shown in Fig. 1 and the positioning protrusion of the fixing member. Figure 7 is a schematic view showing the cooperation of the positioning groove of the positioning member of the hinge structure and the positioning protrusion of the fixing member in the second embodiment of the present invention. _[Main component symbol description] Hinge structure 10,20 Pivot 11 Flange 111 Threaded portion 112 Plug portion 113 Rotating bracket 12 Base plate 121 Positioning plate 122 Fixing hole 1211 Non-circular deformation hole 1221 Fixing bracket 13 Fixing plate 131 Branch floor 132 Fixing hole 1311 Pivoting hole 1321 Engagement hole 1322 16 201021672 •-Limiting protrusion 1323 *Fixture 14,24 Stud 142 Side 240 Side 150 Positioning groove 152, 252 Second bevel 1522, 2432 Non-circular deformation hole 161 ® First limit end 1621 Elastic member 17 Through hole 181 Pad 19 Locking piece 101 Oil groove 1324 Shaft hole 141 Positioning projection 143, 243 Positioning member 15, 25 Non-circular deformation hole 151 First inclined surface 1521, 2431 Limiting piece 16 lug 162 second limit end 1622 friction plate 18 oil groove 182 non-circular deformation hole 191 〇 17