M426808 五、新型說明： 【新型所屬之技術領域】 本新型是有關於一種按鍵模組，特別是指一種薄型的 按鍵模組。 【先前技術】 一般按鍵模組是利用按壓鍵帽來輸入訊號，而鍵帽按 壓後必須能回彈以供下一次的按壓，所以按鍵模組通常包 含支撐鍵帽的彈性支撐機構以及將鍵帽限位的限位機構。 現有一種按鍵模組以剪刀式結構作為支撐機構來支撐鍵帽 ，但疋剪刀式結構在製造及組裝都較為複雜，且使整體按 鍵模組的尚度較高。 為了付合可攜式電子資訊裝置輕薄化的需求，按鍵模 .•且也萬要朝薄型化發展，所以如何簡化按鍵模組結構並降 低整體高度，為需要改進的目標。 【新型内容】 因此’本新型之目的’即在提供一種結構簡單而容易 、、且裝且整體低兩度薄型化的按鍵模組。 於是，本新型按鍵模組，包含一底座、一設於底座上 的電路單元、一對應電路單元設置的鍵帽' 一彈性壓觸單 元，及多個限位機構。彈性壓觸單元設於電路單元與鍵帽 之間，且頂於鍵帽的中央區域並彈性支撐鍵帽使電路單元 與鰱帽相間隔，且彈性壓觸單元受鍵帽下壓可壓抵電路單 70。多個限位機構分佈於彈性壓觸單元周圍的位置，各限 位機構包括可相對上下移動地卡接的一公卡合單元及一母 3 4 元其中之一設於底座且 卡合單元，公卡合單元及母卡合單 其中另一設於鍵帽。 較佳地，公卡合單元具有一桿體，且母卡合單元具有 一與桿體相配合的滑槽。 較佳地彡卡合單元還具有一對分別連接於桿體兩端 的支撐部，且桿體相對於底座水平設置。 較佳地，母卡合單元還具有一對自由端相向靠近的固 持部，且該對固持部共同界定出滑槽。 較佳地，公卡合單元設於底座，且該對支撐部由底座 在上凸伸；母卡合單元設於鍵帽，且該對固持部由鍵帽往 下凸伸。 人較佳地，限位機構總共四個且每兩個限位機構的公卡 合早7C共同構成一公卡合單元組合，公卡合單元組合包括 本體及兩個分別連接於本體兩端的各公卡合單元的桿體 較佳地公卡合單元組合還包括多個連接於本體的凸 柱，且底座設有多個分別配合各凸柱的安裝孔。 較佳地，公卡合單元為一卡勾，且母卡合單元為一扣 rjB. ^ 〇 較佳地，底座設有多個分別對應各限位機構的穿孔。 較佳地，彈性壓觸單元包括一彈性支撐部及一壓觸部 彈陡支撐部呈中空的截頭圓錐狀並頂抵於鍵帽壓觸部 位於彈性支撐部内且往下凸伸，並在鍵帽受力下壓時壓抵 於電路單元。 M426808 較佳地，彈性壓觸單元包括一由該鍵帽往下凸伸的壓 塊，及一設於電路單元上且頂抵於壓塊的金屬彈性體金 屬彈性體在鍵帽下壓時受壓塊抵壓而壓抵於電路單元。 本新型之功效，本新型按鍵模組的結構簡單，容易組 裝’而且整體高度低，具有輕薄化的優點。 【實施方式】 有關本新型之前述及其他技術内容、特點與功效，在 以下配合參考圖式之八個較佳實施例的詳細說明中，將可 清楚的呈現。 在本新型被詳細描述之前，要注意的是，在以下的說 明内容中’類似的元件是以相同的編號來表示。 參閱圖1、圖2與圖3,本新型按鍵模組之第一較佳實 施例包含一底座1、一設於底座1上的電路單元2、一鍵帽 3、一彈性壓觸單元4及多個限位機構5。 底座1包括一金屬加強板11及一塑膠基板12，用以承 載電路單元2、鍵帽3及彈性壓觸單元4。 電路單元2為一薄膜電路板’鍵帽3對應電路單元2 設置，具有一板形本體31及一由該本體31周緣往下延伸 的簷部32。彈性壓觸單元4設於電路單元2與鍵帽3之間 ’且頂於鍵帽3的中央區域並彈性支撐鍵帽3使電路單元2 與鍵帽3相間隔，且彈性壓觸單元4受鍵帽3下壓可使電 路單元2產生電訊號。具體而言，在本實施例，彈性壓觸 單元4包括由橡膠製成且一體成形的一彈性片體41、一彈 性支撐部42及一壓觸部43，以及一導電層44。彈性.支撐 5 P由彈f生片體41往上凸伸且呈中空的截頭圓錐狀並頂 抵於鍵巾目3 ’壓觸部43位於彈性支撐部内且往下凸伸， 導電層44被覆於壓觸部43底端，並在鍵帽3受力下壓時 壓抵於電路單元2’使電路單元2產生電訊號。亦即，當鍵 帽3受力下壓時，會將彈性支撐部42往下壓並連動壓觸部 43往下移動’使壓觸部43底端連同導電層私可以碰觸電 ^單元2形成電連接而產生電訊號；當施加於鍵帽3的力 1移除時’彈性切部42因具有彈性而回復原狀，且鍵帽 3可受彈性支撐部42的彈性回復力作用而往上移動回復原 位。在本實施例中，電路單元2為單層的電路板，在等效 變化的實施態樣，雷技留i 1 4電路早7L 2也可以是三層的電路板且對 應壓觸部43的位置其中間層鏤空，以藉由上下層接觸產生 電訊號’而彈性_單元4即可不設導電層4心 多個限位機構5分佈於彈性壓觸單元4周圍的位置， 在本實施例中，四個限位機構5對稱地分佈於彈性壓觸單 元4的彈性支樓部42周圍，各限位機構5包括可相對上下 滑動地卡接的-公卡合單元51及一母卡合單元K，公卡合 羊兀設於底座！且母卡合單纟52設於鍵们。公卡合單 1八有才干體51卜及一對分別連接於桿體兩端的 支撐部512，1 請切部512由底座1往上凸伸共同支標桿 體511，使桿體511相對於底座】水平設置。母卡合單元52 具有一對由鍵帽3往下凸伸且自由端相向靠近的固持部521 及由δ亥對固持部521共同界定出且與桿體511相配合的 滑槽522。詳細地說，在本實施例，公卡合單元51與底座 M426808 1的塑膠基板12 -體形成，且母卡合單元52與鍵帽3 一體 形成並由鍵帽3的本體31往下凸伸，在電路單元2及彈性 片體4i分別設有四個對應各限位機構5的穿孔2卜川 以供各限位機構5穿過，而且，在底座丨的金屬加強板^ 及塑膠基板12分職有四個對應各母卡合單元52的穿孔 ⑴、⑵，时鍵帽3灯移料供母卡合單元52伸入， 亦即，提供母卡合單元52往下移動的空間。如圖3所示的 方向，公卡合單元51的桿體511位於母卡合單以2的滑槽 ⑵内，即桿體511位於母卡合單元52 _兩固持部切之 間，使母卡合單元52相對於公卡合單元51不能左右移動 ’藉此將鍵帽3在左右方向限位，而且母卡合單元Μ的兩 固持。P 521位於公卡合單元51的兩支標部犯之間，使母 :。早兀52相對於公卡合單元51不能前後移動藉此將 =3在前後方向限位’所以藉由該等限位機構5的公卡 合單元51與母卡合單元52相配合，將鍵帽3在相對於底 座1的水平方向限位。 _ _此外’由於母卡合單元52的一對固持部521是由鍵帽 _在下凸伸且自由端相向靠近’界定出前後貫通（如圖3所 不的方向）且底端開口處較窄的滑槽522，而且兩固持部 :21的自由端處具有往外張開的彈性，將鍵帽3安裝於底座 口 ^ 1要將各限為單元5的母卡合單元52的滑槽522開 卡0單元51的桿體511 ,然後施力將鍵帽3下壓 部IS卡:自早由:5 =體5U揮開母卡合單元52的兩固持 ^ 體511即可進入滑槽522内，當桿體 7 511全部進入滑槽522中，兩固持部521的自由端回復原位 而擋止桿體5U移出滑槽522，除非在鍵帽3反向施加可以 再樓開固持部521的力量才能將桿體511退出滑槽522，藉 此，將鍵帽3在相對於底座〗的垂直方向限位。 該等限位機構5與彈性壓觸單元4相配合使鍵帽3可 相對於底座1在一待壓位置及一下壓位置移動。當鍵帽3 在待壓位置時，鍵帽3同時受到彈性壓觸單元4往上頂推 的力量及由各限位機構5的固持部521夹持桿體511產生下 拉的力量，兩股力量保持平衡，而使鍵帽3未受到按壓外 力時能平穩地保持在待壓位置。當鍵帽3受到按壓外力時 ，各限位機構5的母卡合單元52可相對公卡合單元51往 下移動，亦即，鍵帽3具有由待壓位置往下移動的空間。 因此s鍵帽3受到按壓外力時即可往下移動並擠壓彈性 壓觸單元4的彈性支撐部42及壓觸部43，直到壓觸部43 抵於電路單元2,鍵帽3即位於下壓位置，此時導電層44 接觸電路單it 2形成電連接。當按壓外力移除後，鍵帽3 藉由彈性支撐部42的彈性回復力回到待壓位置，且使導電 層44與電路單元2分離。 雖然在本實施例中，各限位機構5的公卡合單元51是 設於底座1，而母卡合單元52是設於鍵帽3，但是公卡合 單το 51與母卡合單元52的位置亦可互換也就是說公 卡合單元51可以設於鍵帽3而母卡合單元52設於底座i。 參閱圖4、圖5與圖6，本新型按鍵模組之第二較佳實 施例，與第一較佳實施例大致相同，惟在第二較佳實施 M426808 例，彈性壓觸單元4包括一由鍵帽3往下凸伸的壓塊45 ’ 及一設於電路單元2上且頂抵於壓塊45的金屬彈性體 46(metal dome) ^金屬彈性體46具有彈性支撐的功能且本身 為導體’在鍵帽3受到按壓外力由待壓位置往下移動時， 金屬彈性體46受壓塊45抵壓彈性變形而壓抵於電路單元2 ’使電路單元2產生電訊號。當按壓外力移除時’金屬彈 性體46藉由彈性回復力回復原樣並頂推壓塊45，使鍵帽3 回到待壓位置。 參閱圖7、圖8與圖9，本新型按鍵模組之第三較佳實 施例’與第一較佳實施例大致相同，惟，每兩個限位機構5 的公卡合單元51共同構成一公卡合單元組合，該公卡合單 元組合包括一本體51Ό及兩個分別連接於本體510兩端的 各公卡合單元51的桿體511。此外，公卡合單元組合還包 括多個連接於本體510的凸柱513，且底座1由一金屬板構 成並設有多個分別配合各凸柱513的安裝孔13及供母卡合 單元52伸入的穿孔14。 參閱圖10、圖11與圖12’本新型按鍵模組之第四較佳 實施例，與第三較佳實施例大致相同，惟，彈性壓觸單元4 與第二較佳實施例相同，於此不再重述。 參閱圖13、圖14與圖15,本新型按鍵模組之第五較 佳實施例’與第三較佳實施例大致相同，惟，在第五較佳 實施例中，限位機構5總共三個，呈三角分佈，且各限位 機構5的公卡合單元51為一卡勾’而母卡合單元52為一 扣環’各公卡合單元51設於鍵帽3，且各母卡合單元52設 9 M426808 於底座1。 參閱圖16、圖丨7與圖18，本新型按鍵模組之第六較 佳實施例，與第五較佳實施例大致相同，惟，彈性壓觸單 元4與第二較佳實施例相同。 參閱圖19、圖20與圖21，本新型按鍵模組之第七較 佳實施例，與第五較佳實施例大致相同，惟，在第七較佳 實施例中，有兩個限位機構5的公卡合單元51設於底座^ ，而母卡合單元52設於鍵帽3(即如圖19的圖示方向靠左 的兩個限位機構）。 參閱圖22、圖23與圖24，本新型按鍵模組之第八較 佳實施例，與第七較佳實施例大致相同，惟，彈性壓觸單 元4與第二較佳實施例相同。 綜上所述，本新型按鍵模組的結構簡單，容易組裝， 而且整體尚度低，具有輕薄化的優點，故確實能達成本新 型之目的。 惟以上所述者，僅為本新型之較佳實施例而已，當不 能以此限定本新型實施之範圍，即大凡依本新型申請專利 範圍及新型說明内容所作之簡單的等效變化與修飾皆仍 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一立體分解圖’說明本新型按鍵模組之第一較 佳實施例； 圖2是一俯視圖，說明該第一較佳實施例； 圖3是一沿圖2中ΐπ·πι線段所取的剖視圖； 10 M426808 圖4是一立體分解圖，說明本新型按鍵模組之第二較 佳實施例； 圖5是一俯視圖，說明該第二較佳實施例； 圖6是一沿圖5中VI-VI線段所取的剖視圖；。 圖7是一立體分解圖，說明本新型按鍵模組之第三較 佳實施例； 圖8是一俯視圖，說明該第三較佳實施例； 圖9是一沿圖8中ΐχ_ιχ線段所取的剖視圖； 圖10是一立體分解圖，說明本新型按鍵模組之第四較 佳實施例； 圖11是一俯視圖，說明該第四較佳實施例； 圖12是一沿圖11中χπ_χπ線段所取的剖視圖； 圖13是一立體分解圖，說明本新型按鍵模組之第五較 佳實施例； 圖Η是一俯視圖，說明該第五較佳實施例； 圖15是一沿圖14中XIV_XIV線段所取的剖視圖； 圖16是一立體分解圖，說明本新型按鍵模組之第六較 佳實施例； 圖17是一俯視圖，說明該第六較佳實施例； 圖18是一沿圖Π t χνιπ_χνιΙΙ線段所取的剖視圖； 圖19是一立體分解圖，說明本新型按鍵模組之第七較 佳實施例； 圖20是一俯視圖，說明該第七較佳實施例； 圖21是一沿圖20中χχι_χχι線段所取的剖視圖； 11 M426808 圖22是一立體分解圖，說明本新型按鍵模組之第八較 佳實施例； 圖23是一俯視圖，說明該第八較佳實施例；及 圖24是一沿圖23中XXIV-XXIV線段所取的剖視圖。 12 M426808 【主要元件符號說明】 1…… …·底座 411 ··· …·穿孔 11 ·.··· …·金屬加強板 42·.··· …·彈性支撐部 111 ··· …·穿孔 43···.. •…壓觸部 12··.· …·塑膠基板 44·..·· •…導電層 121… ….穿孔 45••… …·壓塊 13··.· •…安裝孔 46··..· •…金屬彈性體 14··.·. …·穿孔 5…… •…限位機構 2…… …·電路單元 51 ••… …·公卡合單元 21 ··.·· •…穿孔 511 ··· •…桿體 3 ....... •…鍵帽 512… •…支撐部 31…… •…板形本體 52… •…母卡合單元 32…… •…簷部 521… •…固持部 4 ....... …·彈性壓觸單元 522… …·滑槽 41…… …·彈性片體M426808 V. New description: [New technical field] The new type is related to a button module, especially a thin button module. [Prior Art] The general button module uses a button to input a signal, and the button cap must be rebounded for the next press, so the button module usually includes an elastic support mechanism supporting the keycap and the key cap. Limit position limit mechanism. The existing button module supports the keycap with a scissor structure as a supporting mechanism, but the scissor structure is complicated in manufacturing and assembly, and the overall pressing of the key module is relatively high. In order to meet the demand for the thin and light portable electronic information device, the button mode is also required to be thinner, so how to simplify the structure of the button module and lower the overall height is a goal that needs improvement. [New content] Therefore, the object of the present invention is to provide a key module which is simple and easy to construct, and which is low in thickness and low in overall thickness. Therefore, the key module of the present invention comprises a base, a circuit unit disposed on the base, a keycap disposed on the corresponding circuit unit, an elastic pressure contact unit, and a plurality of limiting mechanisms. The elastic pressure contact unit is disposed between the circuit unit and the keycap, and is disposed in a central region of the keycap and elastically supports the keycap to space the circuit unit from the top cap, and the elastic pressure contact unit is pressed by the keycap to press the circuit Single 70. The plurality of limiting mechanisms are distributed around the elastic pressure contact unit, and each of the limiting mechanisms includes a male snap unit that can be locked relative to the upper and lower movements, and one of the female 34 yuan is disposed on the base and the engaging unit. One of the male snap unit and the female snap is located in the key cap. Preferably, the male snap unit has a rod body, and the female snap unit has a sliding groove that cooperates with the rod body. Preferably, the 彡 engaging unit further has a pair of supporting portions respectively connected to both ends of the rod body, and the rod body is horizontally disposed with respect to the base. Preferably, the female snap unit further has a pair of retaining portions with the free ends facing each other, and the pair of retaining portions collectively define the chute. Preferably, the male engaging unit is disposed on the base, and the pair of supporting portions are protruded from the base; the female engaging unit is disposed on the keycap, and the pair of retaining portions are protruded downward by the keycap. Preferably, the limit mechanism has a total of four and the public card of each of the two limit mechanisms and the 7C jointly form a common card combination unit. The public card combination unit includes a body and two respectively connected to the two ends of the body. Preferably, the male snap unit unit further includes a plurality of protrusions connected to the body, and the base is provided with a plurality of mounting holes respectively for supporting the protrusions. Preferably, the male snap unit is a hook, and the female snap unit is a buckle rjB. ^ 较佳 Preferably, the base is provided with a plurality of through holes corresponding to the respective limit mechanisms. Preferably, the elastic pressure contact unit comprises an elastic support portion and a pressure contact portion, and the elastic support portion has a hollow frustoconical shape and abuts against the keycap pressure contact portion in the elastic support portion and protrudes downward, and The key cap is pressed against the circuit unit when pressed under pressure. M426808 Preferably, the elastic pressure contact unit comprises a pressing block protruding downward from the keycap, and a metal elastomer metal elastic body disposed on the circuit unit and abutting against the pressing block is pressed by the keycap The pressure block is pressed against the circuit unit. The utility model has the advantages of simple structure, easy assembly, and low overall height, and has the advantages of lightness and thinness. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings. Before the present invention is described in detail, it is to be noted that in the following description, similar elements are denoted by the same reference numerals. Referring to FIG. 1 , FIG. 2 and FIG. 3 , a first preferred embodiment of the present invention comprises a base 1 , a circuit unit 2 disposed on the base 1 , a keycap 3 , an elastic pressure contact unit 4 , and A plurality of limit mechanisms 5. The base 1 includes a metal reinforcing plate 11 and a plastic substrate 12 for carrying the circuit unit 2, the keycap 3 and the elastic pressure contact unit 4. The circuit unit 2 is a thin film circuit board. The keycap 3 is provided corresponding to the circuit unit 2, and has a plate-shaped body 31 and a crotch portion 32 extending downward from the periphery of the body 31. The elastic pressure contact unit 4 is disposed between the circuit unit 2 and the keycap 3 and is disposed in a central region of the keycap 3 and elastically supports the keycap 3 to space the circuit unit 2 from the keycap 3, and the elastic pressure contact unit 4 is subjected to Pressing the keycap 3 causes the circuit unit 2 to generate an electrical signal. Specifically, in the present embodiment, the elastic pressure contact unit 4 includes an elastic sheet body 41 made of rubber and integrally formed, an elastic supporting portion 42 and a pressure contact portion 43, and a conductive layer 44. The support 5P is protruded upward from the elastic body 41 and has a hollow frustoconical shape and abuts against the key towel 3'. The pressure contact portion 43 is located in the elastic support portion and protrudes downward, and the conductive layer 44 Covered at the bottom end of the pressure contact portion 43, and pressed against the circuit unit 2' when the keycap 3 is pressed down, the circuit unit 2 generates an electrical signal. That is, when the keycap 3 is pressed down, the elastic support portion 42 is pressed down and the pressure contact portion 43 is moved downwards. The bottom end of the pressure contact portion 43 together with the conductive layer can be touched by the electric unit 2. Electrically connected to generate an electrical signal; when the force 1 applied to the keycap 3 is removed, the elastic cut portion 42 is restored to its original shape due to elasticity, and the key cap 3 can be moved upward by the elastic restoring force of the elastic support portion 42 Revert to the original position. In this embodiment, the circuit unit 2 is a single-layer circuit board. In the embodiment of the equivalent change, the lightning technology stays i 1 4 circuit 7L 2 may also be a three-layer circuit board and corresponds to the pressure contact portion 43. The middle layer of the position is hollowed out to generate an electrical signal by the contact of the upper and lower layers, and the elastic_unit 4 can be disposed without the conductive layer 4, and the plurality of limiting mechanisms 5 are distributed around the elastic pressure contact unit 4, in this embodiment. The four limiting mechanisms 5 are symmetrically distributed around the elastic branch portion 42 of the elastic pressure contact unit 4, and each of the limiting mechanisms 5 includes a male engaging unit 51 and a female engaging unit that are slidably coupled to the upper and lower sides. K, the male card and the sheep are set on the base! And the female card unit 52 is set at the keys. The male card has a single body and a pair of supporting members 512, and a pair of supporting portions 512 respectively connected to the two ends of the rod body. The cutting portion 512 protrudes upward from the base 1 to extend the common supporting rod body 511 so that the rod body 511 is opposite to the base. 】 Horizontal setting. The female engaging unit 52 has a pair of holding portions 521 projecting downward from the keycap 3 and having free ends facing each other, and a chute 522 which is defined by the δ hai pair holding portion 521 and which cooperates with the rod body 511. In detail, in the embodiment, the male engaging unit 51 is formed with the plastic substrate 12 of the base M426808 1 , and the female engaging unit 52 is integrally formed with the key cap 3 and protrudes downward from the body 31 of the key cap 3 . In the circuit unit 2 and the elastic piece 4i, four perforations 2 corresponding to the respective limiting mechanisms 5 are respectively provided for the respective limiting mechanisms 5 to pass through, and the metal reinforcing plate and the plastic substrate 12 in the base are provided. There are four perforations (1) and (2) corresponding to the respective female engaging units 52, and the keycaps 3 are moved to feed the female engaging unit 52, that is, to provide a space for the female engaging unit 52 to move downward. As shown in FIG. 3, the rod body 511 of the male engaging unit 51 is located in the sliding groove (2) of the female engaging unit 2, that is, the rod body 511 is located between the female engaging unit 52 and the two holding portions, so that the mother The engaging unit 52 cannot move left and right with respect to the male engaging unit 51, thereby terminating the keycap 3 in the left-right direction and the two holdings of the female engaging unit Μ. P 521 is located between the two standard parts of the male card unit 51, so that the mother: . The early engagement 52 cannot be moved back and forth with respect to the male engagement unit 51, thereby limiting the limit of 3 in the front-rear direction. Therefore, the male engagement unit 51 of the restriction mechanism 5 cooperates with the female engagement unit 52 to The cap 3 is limited in the horizontal direction with respect to the base 1. _ _ In addition, since the pair of holding portions 521 of the female engaging unit 52 are protruded from the lower side of the key cap _ and the free ends are adjacent to each other, the front and rear through are defined (the direction is not shown in FIG. 3) and the bottom end opening is narrow. The sliding groove 522, and the two ends of the two holding portions: 21 have an elastic force to open outward, and the key cap 3 is mounted on the base port 1 to open the sliding groove 522 of each of the female engaging units 52 of the unit 5 The rod body 511 of the card 0 unit 51 is then biased to press the key cap 3 pressing portion IS card: the two holding bodies 511 of the female engaging unit 52 are opened by the 5: body 5U to enter the sliding slot 522. When the rod body 7 511 all enters the sliding slot 522, the free ends of the two retaining portions 521 return to the original position and the blocking rod body 5U moves out of the sliding slot 522 unless the retaining portion 521 can be opened again in the reverse direction of the key cap 3. The force can pull the rod 511 out of the chute 522, thereby limiting the keycap 3 in the vertical direction relative to the base. The limiting mechanism 5 cooperates with the elastic pressure contact unit 4 to move the keycap 3 relative to the base 1 in a position to be pressed and a lower pressing position. When the keycap 3 is in the position to be pressed, the keycap 3 is simultaneously pushed by the elastic pressure contact unit 4 and the force of the pull-down by the holding portion 521 of each limiting mechanism 5, and the two forces The balance is maintained, and the keycap 3 can be smoothly held in the position to be pressed without being subjected to an external force. When the keycap 3 is subjected to an external force, the female engaging unit 52 of each of the stopper mechanisms 5 can be moved downward relative to the male engaging unit 51, that is, the keycap 3 has a space that moves downward from the position to be pressed. Therefore, when the s-key cap 3 is pressed against the external force, the elastic support portion 42 and the pressure contact portion 43 of the elastic pressure contact unit 4 can be pushed down and pressed until the pressure contact portion 43 abuts the circuit unit 2, and the key cap 3 is located under In the pressed position, the conductive layer 44 contacts the circuit unit it 2 to form an electrical connection. When the pressing force is removed, the keycap 3 returns to the position to be pressed by the elastic restoring force of the elastic supporting portion 42, and the conductive layer 44 is separated from the circuit unit 2. In the present embodiment, the male engaging unit 51 of each limiting mechanism 5 is disposed on the base 1, and the female engaging unit 52 is disposed on the keycap 3, but the male engaging unit το 51 and the female engaging unit 52 are provided. The positions of the cards can also be interchanged, that is, the male snapping unit 51 can be disposed on the keycap 3 and the female snapping unit 52 can be disposed on the base i. Referring to FIG. 4, FIG. 5 and FIG. 6, the second preferred embodiment of the present invention is substantially the same as the first preferred embodiment. However, in the second preferred embodiment of the M426808, the elastic pressure contact unit 4 includes a a pressing block 45' projecting downward from the keycap 3 and a metal dome 46 provided on the circuit unit 2 and abutting against the pressing block 45 have a function of elastic support and are themselves When the key cap 3 is pressed downward by the external force to be pressed, the metal elastic body 46 is elastically deformed by the pressing block 45 and pressed against the circuit unit 2' to cause the circuit unit 2 to generate an electric signal. When the external force is removed, the metal elastic body 46 is returned to the original state by the elastic restoring force and pushes the pressing block 45 to return the keycap 3 to the position to be pressed. Referring to FIG. 7, FIG. 8, and FIG. 9, the third preferred embodiment of the present invention is substantially the same as the first preferred embodiment. However, the male engaging unit 51 of each of the two limiting mechanisms 5 is configured together. A male snap unit combination includes a body 51Ό and two rod bodies 511 respectively connected to the respective male engaging units 51 at both ends of the body 510. In addition, the male card assembly unit further includes a plurality of protrusions 513 connected to the body 510, and the base 1 is formed of a metal plate and is provided with a plurality of mounting holes 13 and a female engaging unit 52 respectively for supporting the protrusions 513. A perforation 14 that extends into it. Referring to FIG. 10, FIG. 11, and FIG. 12, a fourth preferred embodiment of the present invention is substantially the same as the third preferred embodiment. However, the elastic pressure contact unit 4 is the same as the second preferred embodiment. This will not be repeated. Referring to FIG. 13 , FIG. 14 and FIG. 15 , the fifth preferred embodiment of the present invention is substantially the same as the third preferred embodiment. However, in the fifth preferred embodiment, the limiting mechanism 5 has three in total. The male snapping unit 51 of each of the limiting mechanisms 5 is a hook and the female engaging unit 52 is a buckle. The male engaging units 51 are disposed on the keycap 3, and each female card is provided. The unit 52 is provided with 9 M426808 on the base 1. Referring to Figure 16, Figure 7, and Figure 18, a sixth preferred embodiment of the present button module is substantially identical to the fifth preferred embodiment, except that the resilient pressure contact unit 4 is identical to the second preferred embodiment. Referring to FIG. 19, FIG. 20 and FIG. 21, the seventh preferred embodiment of the present button module is substantially the same as the fifth preferred embodiment. However, in the seventh preferred embodiment, there are two limiting mechanisms. The male engaging unit 51 of the fifth unit is disposed at the base ^, and the female engaging unit 52 is disposed at the keycap 3 (i.e., two limiting mechanisms to the left in the direction shown in Fig. 19). Referring to Figures 22, 23 and 24, the eighth preferred embodiment of the present button module is substantially identical to the seventh preferred embodiment, except that the resilient pressure contact unit 4 is identical to the second preferred embodiment. In summary, the new button module has a simple structure, is easy to assemble, and has a low overall integrity, and has the advantages of being light and thin, so that the purpose of the new type can be achieved. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent changes and modifications made by the novel patent application scope and the new description content are It is still within the scope of this new patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a first preferred embodiment of the present invention; FIG. 2 is a plan view showing the first preferred embodiment; FIG. FIG. 4 is a perspective exploded view showing a second preferred embodiment of the present invention; FIG. 5 is a top plan view showing the second preferred embodiment; FIG. 6 is a cross-sectional view taken along line VI-VI of Fig. 5; Figure 7 is an exploded perspective view showing a third preferred embodiment of the present invention; Figure 8 is a plan view showing the third preferred embodiment; Figure 9 is taken along the line ΐχ_ιχ in Figure 8. FIG. 10 is an exploded perspective view showing a fourth preferred embodiment of the present invention; FIG. 11 is a plan view showing the fourth preferred embodiment; FIG. 12 is a χπ_χπ line segment along FIG. FIG. 13 is an exploded perspective view showing a fifth preferred embodiment of the present invention; FIG. 15 is a plan view showing the fifth preferred embodiment; FIG. 15 is a cross-sectional view of FIG. Figure 16 is an exploded perspective view showing a sixth preferred embodiment of the present invention; Figure 17 is a plan view showing the sixth preferred embodiment; Figure 18 is a perspective view of the same. FIG. 19 is a perspective exploded view showing a seventh preferred embodiment of the present invention; FIG. 20 is a plan view showing the seventh preferred embodiment; FIG. Taken from the line χχι_χχι in Figure 20 11 M426808 FIG. 22 is an exploded perspective view showing an eighth preferred embodiment of the present invention; FIG. 23 is a plan view showing the eighth preferred embodiment; and FIG. A cross-sectional view taken of the XXIV-XXIV line segment. 12 M426808 [Description of main component symbols] 1...... ...·Base 411 ·····Perforation 11 ·······Metal reinforcing plate 42·······elastic support part 111·····Perforation 43···.. •...pressure contact 12···························································· Mounting hole 46··..·•...Metal elastomer 14·······Perforation 5...•...Limiting mechanism 2...··Circuit unit 51 ••...················································ .·· •...Perforation 511 ··· •...Rod body 3 ....... •...Key cap 512... •...Support section 31...•...Slab-shaped body 52...•...Female snap-in unit 32... ... •... 檐 521... •...Retaining part 4............·Elastic pressure contact unit 522...··Chute 41...··Elastic sheet
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