201001464 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種按鍵結構，尤其涉及一種用於電子產 品之按鍵結構。 【先前技術】 電子設備面板上常設置有按鍵結構，用於控制電源開 關或進行其他功能調節，隨著電子行業迅速發展，對電子 設備中按鍵之控制精準度等要求亦越來越高。 一種按鍵結構，包括按壓部、可動接觸片及固定觸 點，按壓部底部有一凸起之凸塊，可動接觸片為拱形彈 片，凸塊抵持於拱形彈片頂部。按壓按鍵之按壓部，凸塊 將拱形可動觸片壓下，與固定觸點接通；放鬆按壓部，拱 形可動觸片抵持凸塊，使按壓部復位。還有一種按鍵結 構，在上述之凸塊上套一壓縮彈簧，該彈簧可用於支撐按 壓部，同時亦可幫助按壓後按壓部之復位。 上述按鍵結構中，凸塊位於按壓部底部之中心部位， 所述彈簧亦支撐於按壓部之中心部位，因此在按壓按鍵 時，必須按壓按鍵中按壓部之中心處部位才能達到較好之 按壓效果，而按壓遠離中心部位之其他部位時，彈簧一側 受壓，按壓部各部分行程不一，導致按鍵内部可動觸片與 固定觸點接觸不良或按壓後復位效果不好，同時，復位效 果不好導致按壓下之部位可能卡死，按壓手感不佳。 【發明内容】 鑒於上述情況，有必要提供一種各部位均有較好按壓 201001464 效果、按壓手感較佳之按鍵結構。 一種按鍵結構，包括按鍵帽、與按鍵帽連接之支穴以 及設置於按鍵帽與支架間之彈片，該彈片包括中心片2均 布於中心片周圍抵持按鍵帽之複數個支腳。 - 上述按鍵結構中，彈片採用複數個支腳之結構，使按 鍵帽受到複數個部位之彈性支撐，無論按壓按鍵帽中央= 位還是遠離中央部位之其他部位時，按鍵帽各個部位均= 按壓方向運動，使按鍵接通，在按壓停止後，該彈片中/σ 複數個支腳支撐按鍵帽重定。採用此種結構，克服了因= 用局部彈性支㈣造成之按賴财&、按料復位效果 不好及按壓手感不佳等缺點，提高了按鍵結構之靈敏 改善了按壓手感。 又’ 【實施方式】 下面將結合附圖及實施方式對本發明之按鍵結構 進一步之詳細說明。 ”月一併參關1、圖2，本較佳實施方式巾之按鍵 為一電源按鍵結構。按鍵結構包括按鍵㈣、支架20^ 置於按鍵巾胃10與支架2〇之間之彈#舰容置 之按鍵壓片40、電路板5G、卡細。 ^20内 按鍵mo包括似u、錢㈣紙第_表面13。本 把方式t第-表面i3g卩為按鍵帽10之底面， 心 面13為台階面，第一表面13中央有一凸台i3i，丄： 131上沿圓周方向均布複數個螺紋孔加，在凸台⑶中, 處有一凸起之接觸部1313。 丨 201001464 支架20為一大致圓筒狀殼體，該支架加上固連一凸緣 21，内表面23上開有-環形槽231及一沿軸向延伸之定位 槽 233 〇 彈片30包括巾31及均布於巾心丨31周圍之複數 個支聊33。本實施方式中中心片31為環形，套於按鍵帽ι〇 之接觸部加上；複數個支腳33數目為三個，分散地抵持 於按鍵帽1〇之第一表面13，支腳33包括抵持於第一表面13 之抵持部位33ί及與第一表面13垂直之變形部位％3。 按鍵壓片4 G包括-環形部分4 i及凸㈣環形部分4丄 邊緣之第—定位片43。在環料純加功複數個通孔 411，該複數個通孔411與上述按鍵帽1()中凸台131上之複數 個螺紋孔1311位置相匹配，通過複數個螺釘緊固件4ιιι連 接於按鍵帽10。第-定位片43卡持於支架2㈣之定位槽 233内’限制了按鍵壓片4〇在支架2〇内之轉動。 電路板50包括基板51及凸出於基板51邊緣之第二定 位片53。基板51上固連有弯形可動觸片511及與可動觸片 511相對之固定觸點513，該可動觸片511和固定觸點513分 別與不同電極（圖未示）連接。第二定位片53卡持於支竿 2〇内之餘槽233内，限制了電路板50在支架_之轉動。 卡簧60為固定於支架2〇内之環形凹槽23ι内，該卡菁 60將電路板50卡持於支架2〇内。 請一併參閱圖3，當按壓按鍵帽10之頂蓋11時，第一 表面13壓迫彈片3Q中支腳33抵持於第一表面批抵持部 位331，使支腳33中垂直於第一表面13之變形部位333沿徑 8 201001464 向彎曲變形’整個彈片30之高度降低，按鍵帽10上凸台ι31 中心部之凸起之接觸部1313接觸並按壓基板51上之弯形 可動觸片511，使該可動觸片511與固定觸點513接觸，按鍵 接通。當停止按壓按鍵帽10之頂蓋11時，彈片30之變形部 位333處之形變消失，彈片30將按鍵帽1〇頂起最終復位。 採用此按鍵結構，三個支腳33均勻分佈於按鍵帽底 部之周圍’按壓按鍵帽10之中心部位時，三個支腳33同時 受壓產生形變使按鍵接通，放鬆按鍵帽10時，三個支腳33 同時將按鍵帽10重定。當按壓按鍵帽10遠離中心部位之其 他部位時，該處施加之力仍可以分散到周圍之三個支腳33 處，使該三個支腳33同時變形’進而將按鍵接通，放鬆時 按鍵帽10重定。因此，在按壓過程中，當無論按壓按鍵帽 1 〇頂蓋11之中心部位還是遠離中心部位之其他部位，均可 保證按鍵帽10與彈片30同時運動，從而對按鍵進行控制， 避免了按鍵過程中出現之接觸不良，提高了按鍵結構之靈 敏度。同時亦改善了按壓手感。 可以理解，本發明之按鍵結構中，彈片3〇之複數個支 腳33不局限於三個，可以為四個或五個以及更複數個。彈 片30之中心片31不局限於環形’亦可為實心片，周圍連接 複數個支腳33，此時將按鍵帽1〇中之凸起之接觸部1313加 工為周圍開有複數個軸向槽（圖未示）之圓筒狀，將該中 心片31置於接觸部1313内部，複數個支腳33從複數個軸向 槽内伸出來支撐按鍵帽1〇 ;彈片3〇之中心片31不局限於整 體結構’可為複數個分離之部分，每部分上連接相應之支 9 201001464 腳33。支架20之結構亦不局限於此，可以是截面為方形或 其他形狀之筒狀。按鍵壓片40還可以通過鉚接、粘接及焊 接等其他連接方式連接到按鍵帽10上。第一表面13中間可 以不為台階式，可為一平面，而將凸台131或接觸部1313 以及複數個螺紋孔1311直接加工在該平面上。 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係本發明較佳實施方式之按鍵結構之示意圖； 圖2係圖1中所示按鍵結構之零件分解圖； 圖3係圖1中所示按鍵結構之剖視圖。 【主要元件符號說明】 按鍵帽 10 頂蓋 11 第一表面 13 凸台 131 螺紋孔 1311 接觸部 1313 支架 20 凸緣 21 内表面 23 環形槽 231 定位槽 233 彈片 30 中心片 31 支腳 33 抵持部位 331 變形部位 333 按鍵壓片 40 環形部分 41 201001464 通孔 411 緊固件 4111 第一定位片 43 電路板 50 可動觸片 511 固定觸點 513 第二定位片 53 卡簧 60 11201001464 IX. Description of the Invention: [Technical Field] The present invention relates to a key structure, and more particularly to a key structure for an electronic product. [Prior Art] A button structure is often provided on the panel of an electronic device for controlling the power switch or performing other function adjustments. With the rapid development of the electronic industry, the control precision of the buttons in the electronic device is also becoming higher and higher. A button structure comprises a pressing portion, a movable contact piece and a fixed contact point. The bottom of the pressing portion has a convex protrusion, and the movable contact piece is an arched elastic piece, and the convex block abuts against the top of the arched elastic piece. Pressing the pressing portion of the button, the projection presses the arch movable contact piece to be in contact with the fixed contact; the pressing portion is released, and the arch movable contact piece abuts the projection to reset the pressing portion. There is also a button structure in which a compression spring is placed on the above-mentioned bump, and the spring can be used to support the pressing portion and also to assist in resetting the pressing portion after pressing. In the above button structure, the bump is located at the center of the bottom of the pressing portion, and the spring is also supported at the central portion of the pressing portion. Therefore, when the button is pressed, the center portion of the pressing portion of the button must be pressed to achieve a better pressing effect. When pressing away from other parts of the central part, the spring side is pressed, and the stroke of each part of the pressing part is different, resulting in poor contact between the movable contact piece and the fixed contact inside the button or the reset effect after pressing, and the reset effect is not good. Therefore, the part that is pressed may be stuck, and the pressing feel is not good. SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a button structure in which each part has a better pressing effect of 201001464 and a better pressing feel. A button structure includes a button cap, a support hole connected to the button cap, and a spring piece disposed between the button cap and the bracket, the elastic piece including a plurality of legs of the center piece 2 uniformly surrounding the center piece against the button cap. - In the above button structure, the elastic piece adopts a structure of a plurality of legs, so that the button cap is elastically supported by a plurality of parts, regardless of whether the center of the button cap is pressed or the other part of the center part is away, the various parts of the button cap = pressing direction Movement, the button is turned on, and after the pressing is stopped, the /σ plurality of legs supporting the button cap are reset in the shrapnel. By adopting such a structure, the disadvantages such as the use of the local elastic branch (four), the poor returning effect of the material and the poor feeling of pressing are overcome, and the sensitivity of the button structure is improved, and the pressing feel is improved. [Embodiment] Hereinafter, the key structure of the present invention will be further described in detail with reference to the accompanying drawings and embodiments. "Monitoring together, Figure 2, the button of the preferred embodiment is a power button structure. The button structure includes a button (four), a bracket 20^ is placed between the button towel stomach 10 and the bracket 2〇. The button press 40, the circuit board 5G, and the card are accommodated. The button mo in the ^20 includes the u-th, the money (four) paper _ surface 13. The method t-surface i3g卩 is the bottom surface of the button cap 10, the heart surface 13 is a step surface, a protrusion i3i is arranged in the center of the first surface 13, and a plurality of threaded holes are uniformly distributed in the circumferential direction on the 丄: 131, and a convex contact portion 1313 is formed in the boss (3). 丨201001464 The bracket 20 is a substantially cylindrical casing, the bracket is fixedly attached to a flange 21, and the inner surface 23 is provided with an annular groove 231 and an axially extending positioning groove 233. The elastic piece 30 comprises a towel 31 and is evenly distributed on the towel. The plurality of branches 33 around the palpitations 31. In the present embodiment, the center piece 31 is annular, and is placed over the contact portion of the button cap ι〇; the number of the plurality of legs 33 is three, which are dispersedly resisted by the button cap. a first surface 13 of the first leg, the leg 33 includes a resisting portion 33 ί against the first surface 13 and perpendicular to the first surface 13 The deformation portion is 3. The button pressing piece 4G includes a ring-shaped portion 4i and a first positioning piece 43 of the edge of the convex portion (4) of the annular portion 4. The plurality of through holes 411 are uniformly applied to the ring material, and the plurality of through holes 411 are formed. The position of the plurality of screw holes 1311 on the boss 131 in the button cap 1 () is matched with the plurality of screw fasteners 4 connected to the button cap 10. The first positioning piece 43 is clamped in the positioning groove 233 of the bracket 2 (four). The rotation of the button press 4 in the holder 2 is limited. The circuit board 50 includes a substrate 51 and a second positioning piece 53 protruding from the edge of the substrate 51. The substrate 51 is fixed with a curved movable contact 511 and The movable contact piece 511 is opposite to the fixed contact 513. The movable contact piece 511 and the fixed contact point 513 are respectively connected to different electrodes (not shown). The second positioning piece 53 is held in the remaining groove 233 in the support 2〇. The rotation of the circuit board 50 in the bracket_ is restricted. The card spring 60 is fixed in the annular groove 23i in the bracket 2, and the card 60 holds the circuit board 50 in the bracket 2〇. 3. When the top cover 11 of the button cap 10 is pressed, the first surface 13 presses the leg 33 of the elastic piece 3Q against the first The surface resisting portion 331 causes the deformation portion 333 of the leg 33 perpendicular to the first surface 13 to be bent along the diameter 8 201001464 to reduce the height of the entire elastic piece 30, and the convex portion of the central portion of the boss ι31 on the button cap 10 The contact portion 1313 contacts and presses the curved movable contact piece 511 on the substrate 51, and the movable contact piece 511 is brought into contact with the fixed contact 513, and the button is turned on. When the top cover 11 of the button cap 10 is stopped, the deformation of the elastic piece 30 is performed. The deformation at the portion 333 disappears, and the elastic piece 30 pushes the button cap 1 to finally reset. With this button structure, the three legs 33 are evenly distributed around the bottom of the button cap. When the center portion of the button cap 10 is pressed, the three legs 33 are simultaneously pressed to generate a deformation, so that the button is turned on, and when the button cap 10 is released, three The legs 33 simultaneously reset the button cap 10. When the button cap 10 is pressed away from other parts of the central portion, the force applied thereto can still be dispersed to the surrounding three legs 33, so that the three legs 33 are simultaneously deformed, and then the button is turned on, and the button is released when relaxed. Cap 10 is reset. Therefore, during the pressing process, when the center portion of the top cover 11 of the button cap 1 is pressed or away from other parts of the center portion, the button cap 10 and the elastic piece 30 can be simultaneously moved, thereby controlling the button and avoiding the button process. Poor contact in the middle improves the sensitivity of the button structure. At the same time, the pressing feel is also improved. It can be understood that in the key structure of the present invention, the plurality of legs 33 of the elastic piece 3〇 are not limited to three, and may be four or five and more plural. The center piece 31 of the elastic piece 30 is not limited to the ring shape, and may be a solid piece. A plurality of legs 33 are connected around the frame. In this case, the contact portion 1313 of the protrusion in the button cap 1 is machined to have a plurality of axial grooves around. a cylindrical shape (not shown), the center piece 31 is placed inside the contact portion 1313, and a plurality of legs 33 project from a plurality of axial grooves to support the button cap 1; the center piece 31 of the elastic piece 3〇 is not Limited to the overall structure 'can be a plurality of separate parts, each part is connected to the corresponding branch 9 201001464 foot 33. The structure of the bracket 20 is not limited thereto, and may be a cylindrical shape having a square or other shape in cross section. The button press 40 can also be attached to the button cap 10 by other means of riveting, bonding and soldering. The first surface 13 may not be stepped in the middle, but may be a flat surface, and the boss 131 or the contact portion 1313 and the plurality of screw holes 1311 are directly processed on the plane. 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 schematic view of a key structure of a preferred embodiment of the present invention; FIG. 2 is an exploded view of the key structure shown in FIG. 1. FIG. 3 is a cross-sectional view of the key structure shown in FIG. [Main component symbol description] Key cap 10 Top cover 11 First surface 13 Projection 131 Threaded hole 1311 Contact portion 1313 Bracket 20 Flange 21 Inner surface 23 Annular groove 231 Positioning groove 233 Spring piece 30 Center piece 31 Leg 33 Resisting part 331 deformation part 333 button compression piece 40 annular part 41 201001464 through hole 411 fastener 4111 first positioning piece 43 circuit board 50 movable contact piece 511 fixed contact 513 second positioning piece 53 circlip spring 60 11