4484 5 6 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（1 ) 技術領域 本發明係有關具備覆蓋鍵頂之筆記型電腦等之鍵盤開 關，尤有關在開閉蓋之際下降俾收納鍵頂之鍵盤開關。 背景技術 過去已知有下降俾收納鍵頂之鍵盤開關。第7至第9 圖顯示此習知鍵盤開關，於支持多數鍵頂1 0 2之支持板 1 ◦ 7與各鍵頂1 0 2之間設有由第1連桿構件1 0 1 a 及第2連桿構件101b構成之交叉連桿101。 第1連桿構件1 0 1 a與第2連桿構件1 0 1 b分別 形成3字形1藉中間轉動支點1 0 1 c相互轉動自如連結 =如第7圖所示，第1連桿構件10 1 a在支持板107 側之一端構成樞裝於支持板1 0 7之支持突起之鉸鏈端部 1 1 0。在鍵頂1 0 2側之另一端藉由嵌合設在鍵頂 1 0 2背面之導部1 0 5構成左右移動自如並轉動自如之 移動端部111。又，第2連桿構件101b之支持板 1 0 7側之一端構成樞設於嵌合長孔之移動端部1 1 2， 鍵頂1 0 2側之另一端構成轉動自如連結於鍵頂1 0 2背 面之鉸鏈端部1 1 3。 於鍵盤1 0 2成未按壓狀態之第7圖所示待機位置， 在鍵頂1 0 2下方配置起復位彈簧作用之倒杯狀橡膠彈性 部1 1 4 1其抵接自鍵頂1 0 2之底面重設之按壓部 1 0 6下面。 倒杯狀橡膠彈性部1 1 4 一體形成於層疊在開關片 -------------裝-----：----訂---------線 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中囷國家標準（CNS)A4規格（210 * 297公釐） -4 - 4484 5 6 A7 B7 經濟部智慧財產局員工消費合作社印s 五'發明說明（2 ) 1 ◦ 3上之橡膠片1 〇 4上，在倒杯狀彈性部1 1 4更下 側之開關片1 0 3上形成至複合開關部1 〇 3 a。此等橡 膠片1 0 4與開關片1 〇 3配置成可一體滑動於支持板 1 0上。 一自上側按壓鍵頂1 〇 2，鍵頂1 〇 2即爲交叉連桿 1 0 1導引’一面不作大的傾斜，保持大致平行狀態，一 面下降，結果，如第8圖所示，鍵頂1 〇 2之按壓部 1 0 6彎曲倒杯狀橡膠彈性部1 1 4 一導通，作動主複合 開關部1〇3 a . 覆蓋複數鍵頂1 0 2全體之蓋1 1 5轉動自如連結於 安裝此鍵盤開關之機殼。如第9圖所示 > 一開閉蓋1 1 5 ，即與此關閉操作連動，橡膠片1 0 4與開關片1 0 3相 對於支持鍵頂1 0 2之支持板1 0 7朝圖式左側滑動，倒 杯狀橡膠彈性部1 1 4退避至鍵頂1 0 2之收納凹部 1 1 6下側。藉由倒杯狀橡膠彈性部1 1 4退避，鍵頂 1 0 2及交叉連桿1 〇 1藉由本身重量落下，全體降低， 又，即使鍵頂1 0 2落下，主複合開關部1 0 3 a亦不導 通作動。 如此，若在關閉蓋1 1 5之際使倒杯狀橡膠彈性部 1 1 4退避於鍵頂1 0 2之收納凹部1 1 6內’即在不使 用筆記型電腦的長時間內，使作爲回復彈簧之倒杯狀橡膠 彈性部1 1 4成不彎曲狀態，又，在關閉蓋1 1 5狀態下 ’達到筆記型電腦薄型化。 惟，於此種構造之鍵盤開關中，由於在關閉蓋1 1 5 -------------裝-----：----訂---------線 f請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用t國國家標準（CNS)A4規格（210 X 297公« ) - 5 - 4484 5 6 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（3 ) 狀態下’復位彈簧（倒杯狀橡膠彈性部）1 i 4僅退避至 避免與鍵頂1 〇 2之按壓部1 0 6相干涉之位置（收容凹 部）1 1 6 '故支持板1 〇 7與鍵頂1 〇 2之間隔無法在 倒杯狀橡膠彈性部1 1 4之自由狀態之高度以下，這是造 成薄型化界限之主因。 又’由於形成按壓部1 0 6及收容凹部1 1 6於鍵頂 1 0 2底面，故鍵頂1 〇 2大型化，鍵盤開關1 0 0全體 大型化，更且，在使復位彈簧1 1 4移動至退避位置之收 容部1 1 6方面，有必要長距離滑動，故與蓋1 1 5連動 之機構會大型，複雜化。 更且，在一體具備復位彈簧1 1 4之橡膠片1 0 4與 開關片1 0 3全體一體滑動方面，需要大的操作力。因此 ，固然亦知僅使具備復位彈簧1 1 4之橡膠片1 0 4相對 於開關片1 0 3滑動，惟有主複合開關部1 〇 3之開關部 1 0 3 a錯誤作動之虞，又爲了避免橡膠片1 0 4與開關 片1 0 3摩擦，有必要介設聚酯片等，因此’成爲高價品 4 本發明係考慮此等習知問題點而作成者’其目的在於 提供一種可在關閉蓋之際不壓縮復位彈簧而薄型化之鍵盤 開關= 其目的復在於提供一種可藉簡單構造’使復位彈簧移 動至退避位置，可用輕的操作力啓閉蓋之鍵盤開關。 發明槪要 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -6 - ------------I I ----------訂----------I (請先閲讀背面之注意事項再填寫本頁) 448456 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（4) 本發明鍵盤開關係具備收容於機殼內之支持板，安裝 於支持板之支持突起與鍵頂之間。上下作動自如導引鍵頂 之交叉連桿，避開支持突起而滑動自如配置於支持板上， 形成藉由鍵頂下降作動之開關部之開關片，一體安裝於鍵 頂或交叉連桿，抵接開關片，使下降之鍵頂朝上側回復之 復位彈簧，以及與覆蓋鍵頂之關閉操作連動，使開關片及 支持板之一相對於另一自待機位置朝退避位置滑動，同時 使鍵頂成下降狀態之連動機構之鍵盤開關，特徵在於，於 退避位置，在開關片抵接復位彈簧之部位形成退避孔，收 容復位彈簧之一部份於退避孔內。 於待機位置一按壓鍵頂，開關部即藉由鍵頂下降作動 ，又，一解除按壓，鍵頂即藉復位彈簧上升，解除開關部 之動作。 一進行蓋之開關動作，開關部即相對滑動至退避位置 1即使鍵頂與開關操作連動而成下降狀態，亦不動作。又 ，復位彈簧之一部份落入開關片之退避孔，收容於退避孔 內。即使抵接位置下降，鍵頂成下降狀態，復位彈簧亦可 保持待機位置之狀態。 又’較佳地’鍵盤開關進一步於開關片形成供與交叉 連桿一體連設之從動爪片插入之嵌合孔，在開關片或支持 板之一朝退避位置滑動之際，使相對移動之嵌合孔之周緣 抵接從動爪片，沈落交叉連桿，使鍵頂下降。 開關片或支持板一自待機位置移動至退避位置，嵌合 孔之周緣即抵接從動爪片，沈落交叉連桿，使鍵頂下降。 本紙張尺度適用t國國家標準（CNS)A4規i_ (210 X 297公釐)' -------------裝-----：----訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 4484 5 6 A7 B7 五、發明說明（5 ) 因此，只要藉由加工開關片及交叉桿’即可構成使鍵頂成 下降狀態之連動機構。 又，較佳地，鍵盤開關更係復位彈簧爲外伸支持於鍵 頂或交叉連桿之細長狀板彈簧’處於待機位置之復位彈簧 之自由端藉由鍵頂下降’按壓開關片之開關部，使開關部 作動者。 由於復位彈簧兼用來作爲按壓開關而使其作動之致動 器，故部件數減少，鍵盤開關之構造簡單化。由於即使在 待機位置，亦未重覆設置致動器於復位彈簧上，故鍵盤開 關薄型化。 又，較佳地，鍵盤開關更係開關片與蓋之啓閉操作連 動，朿對於支持板，在待機位置與退避位置之間滑動者。 由於僅形成開關部於開關片，故可藉輕的操作力，自 待機位置朝退避位置滑動。 又’較佳地：鍵盤開關更係於開關片上形成，滑動方 向爲縱長方向之開縫，遊嵌支持板之支持突起於開縫，藉 支持突起導引開關片之導件者。 開關片藉由支持突起遊嵌於開縫，不用別設導引構件 ，沿滑動方向導引。 圖式之簡單說明 第1圖係本發明一實施形態之鍵盤開關1之處於待機 位置之鍵頂1 0之要部剖視圖。 第2圖係顯示自第1圖之待機位置按下鍵頂2之狀態 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -8- -------------裝-----：----訂---------線 (請先閱讀背面之注意事項再填寫本頁) 44Θ4 5 6 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（6 ) 之鍵開關要部剖視圖。 第3圖係處於退避位置之鍵開關1 0之要部剖視圖。 第4圖係顯示鍵開關1 0之各構成部件之分解斜視圖 〇 第5圖係蓋2 9開啓之鍵盤開關1之平面圖。 第6圖係放大第5圖之聯動機構之要部平面圖。 第7至9圖係顯示習知鍵盤開關1 0 0之圖式，其中 第7圖係處於待機位置之鍵盤開關1 0 〇之要部縱剖視圖 ，第8圖係顯示自待機位置按壓鍵頂1 〇 2之狀態之要部 縱剖視圖，第9圖係顯示鍵盤開關1 0 Q收納時之要部縱 剖視圖。 主要元件對照表 1 鍵盤開關 2 鍵頂 3 開關片 3 a 主複合開關部 4 圓盤彈簧 5 導引支承部 6 U字軸承部 7 內側連桿 8 外側連桿 7 a，8 a 腕部 7 b > 8 c 樞軸 ------------- — 丨 — l· I 丨丨 -------- (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）-9- 4484 5 β1 Α7 Β7 五、發明說明（7 ) (請先閱讀背面之注意事項再填寫本頁) 7 c ，8 b 滑動突起 10 鍵開關 lib 沖孔 1 1 ，1 2 支持突起 11a 長孔 12a 圓形孔 13 交叉連桿 14 機殻 15 從動爪片 1 6 嵌合孔 1 6 a 從側緣 17 退避孔 1 8 支持板 19 導引開縫 2 2 連結板 2 4 板彈簧片 24a 抵接部 2 5 圓柱凸輪 經濟部智慧財產局員工消費合作社印製 25a 凸輪槽 2 6 滑件 2 6 a 從動件 2 7 滑動角件 2 9 蓋 10 0 鍵盤開關 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） -10 - 448456 經濟部智慧財產局員工消費含作社印製 A7 B7 五、發明說明（8 ) l〇la 第1連桿構件 101b 第2連桿構件 10 1c 轉動支點 1 0 2 鍵頂 103 開關片 103a 主複合開關 104 橡膠片 10 5 導部 106 按壓部 107 支持板 110 鉸鏈端部 111 移動端部 112 移動端部 113 鉸鏈端部 114 倒杯狀橡膠彈性部 115 蓋 116 收納凹部 闲以實施發明之最佳形態 以下藉第1至第6圖說明本發明一實施形態之鍵盤開 關1。本實施形態之鍵盤開關1係在以金屬板，合成樹脂 板等構成之支持板18上排列多數個第1至第4圖所示鍵 開關1 〇者’各鍵開關1 ◦如第4圖所示，由鍵頂2，交 叉連桿（cross link ) 1 3 ’形成主複合開關部3 a之開關 本紙張尺度適用_國國家標準（CNS)A4規格（210 X 297公《 ) - 11 , -------------裝----K----訂---------線 (請先閱讀背面之注意事項再填寫本頁) A7 4434 5 6 ____B7_____ 五、發明說明（9 ) 片3以及支持板1 8構成。本實施形態之鏈盤開關用來作 爲筆記型電腦之鍵輸入裝置，安裝在第5圖所示筆記型電 腦之機殼1 4上|在筆記型電腦不使用而收納時，藉由相 對於機殼1 4安裝之蓋2 9之關閉操作，覆蓋各鍵開關 1 0之鍵頂2。 鍵頂2由A B S樹脂等合成樹脂之成型品製成，於此 鍵頂2底面之後方（第1圖之右側），轉動自如支持內側 連桿7後側之一對U字軸承部6，於前側（第1圖之左側 )，轉動並滑動自如導引外側連桿8前側之一對導引支承 部5 ，分別一體形成。 交叉連桿1 3由一體具備分別平行於二側之腕部7 a ，8 a之一組合樹脂製內側連桿7及外側連桿8構成’二 者在二腕部7a ，8a之中央成交叉狀態轉動自如連結=> 此交叉連桿13安裝於前述鍵頂2之底面與自支持板 1 8裁切立起之支持突起1 1 ，1 2之間，以各個連桿7 ，8之一側爲鉸鏈端部，以另一側爲移動端部，予以安裝 亦即，於內側連桿7之後側，連結腕7 a ，7 a間之 樞軸7 b轉動自如嵌合於鍵頂2之U字軸承部6 ，於前側 ，突設於腕部7 A，7 A之側面之滑動突起7 C遊嵌於穿 設在前側支持突起1 1之長孔1 1 a ，轉動並沿前後方向 滑動自如支持。又，於外側連桿8之前側，突設在連結二 腕部8 a間之連結板2 2二側之滑動突起8 B轉動且沿前 後方向滑動自如嵌合於鍵頂2之導件支承部5，於後側’ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） — llllt — ll — — — · ' 1111111 - — — I ----- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 4484 5 6 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（1〇) 突設於腕部8 a ，8 a之側面之樞軸8 C遊嵌於穿設在後 方支持突起1 2之圓形孔1 2 a ’轉動自如支持。 藉由連結交叉連桿1 3於鍵頂2底面與自支持板1 8 裁切立起之支持突起1 1 ，1 2之間，鍵頂2維持水平狀 態，藉交叉連桿1 3上下活動自如導引。 於內側連桿7之腕部7 a ，7 a前側，在相較於前側 支持突起1 1所支持之位置更傾斜下側成圓弧狀連設從動 爪片1 5。 又，於外側連桿8之連結板2 2之中央，傾斜向下一 體連設一體連設細長帶狀板彈簧片2 4。此板彈簧片2 4 外伸支持於連結板2 2後方，於構成下端之自由端側之底 面沖裁形成彈性接觸開關片3表面之圓箔形抵接部2 4 a ύ 於第7圖所示待機位置，在抵接部2 4 a抵接之開關 片3之位置，形成由主複合開關部3 a與載置於其上方之 圓盤彈簧4構成之開關部。 主複合開關部3 a由印刷於上下撓性片上之活動接點 及固定接點形成，上下撓性片由絕緣隔件居間層疊，藉此 ，隔著一點點間隙相向。圓盤彈4係將彈性金屬板折曲成 圓板盤狀者，藉由黏結其周圍於撓性片，黏合於主複合開 關部3 a上。 如第4圖所示，開關片3相對於支持板1 8前後方向 滑動自如滑動自如配置在支持板1 8上，於前側支持突起 1 1及後側支持突起1 2之突出位置穿設導引開縫1 9， 本紙張尺度適用中國國家標準（CNS)A4規袼（210 X 297公釐）.13 - ------------------.1---訂--------- <請先閱讀背面之注意事項再填寫本頁) 44B456 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（11) 俾滑動而不與自支持扳1 8向上裁切立起之前側支持突起 1 1及後側支持突起1 2相干涉。導引開縫1 9以前後方 向爲縱長方向’形成較前側支持突起1 1及後側支持突起 1 2之厚度略大之寬度，藉此’開關片3爲支持突起1 i ’ 12導引，前後方向滑動。 插通內側連桿7之從動爪片I5之嵌合孔16連接導 引開縫1 9而穿設於插通前側支持突起1 1之導引開縫 1 9內側。於開關片3朝前方（朝退避位置）滑動之際， 從動爪片1 5抵接嵌合孔1 6之後側緣1 6 a ，朝上方推 壓’使內側連桿7之腕部7 a，7 a以滑動突起7 c爲中 心朝嵌入方向旋轉。 又，於開關片3滑動至前方之退避位置，在板彈簧片 2 4之抵接部2 4 a彈性接觸之開關片3之部位，亦即在 主複合開關部3 a之稍後側位置，穿設圓形退避孔1 7， 收容位於退避位置之板彈簧片2 4之一部份。 支持板1 8固定收容於機殼1 4內，就每一鍵開關 1 ◦，於其對應部位各切裁立起一對前述前側支持突起 1 1及後側支持突起1 2。於沖裁此前側支持突起1 1形 成之沖孔1 1 b，如第1圖所示，在待機位置，收容插通 嵌合孔1 6之內側連桿7之從動爪片1 5前端。 如第5〜6圖所示，開關片3藉設於與機殼1 4之蓋 2 9連結之連結部之變換機構，與蓋之啓閉操作連動，前 後方向滑動。 此變換機構具有與旋轉自如支持蓋2 9之樞铀一體旋 本紙張尺度適用中國國家標準<CNS)A4規格（210 x 297公釐） -14 - -----r---訂--------1 (請先閱讀背面之注意事項再填寫本頁) 44845 6 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（12) 轉之圓柱凸輪2 5 ，自內側將滑件2 6之從動件2 6 a遊 嵌於穿設在圓柱凸輪2 5之筒狀凸輪槽2 5 a。金屬薄板 成逆L字狀形成之滑動角件2 7黏合於滑件2 6，挾持， 固定開關片3之圖中上側及左側之邊緣於沿此滑動角件 2 7內側折曲之槽溝內，使撓性開關片3與滑動角件一起 滑動。結果|蓋2 9 —藉由啓閉操作旋轉，滑件2 6即前 後（圓中左右）進行往復直線運動，開關片3與滑件2 6 —起前後滑動。 以下說明如此配置之鍵盤開關1之動作。 第1圖顯示開啓蓋2 9，未施加按壓力於鍵頂2之待 機位置’顯示鍵開關之輸入操作處於待機之狀態。 於此待機位置，板彈簧片2 4之抵接部2 4 a彈性接 圓盤簧4 1向上升起外側連桿8 =結果，鍵頂2藉交叉連 桿1 3支持於最高位置。 一按壓鍵頂2 ，鍵頂2即一面藉交叉連桿1 3保持水 平狀態，一面下降。如第2圖所示，板彈簧片2 4之抵接 部2 4 a按壓，彎曲圓盤簧4。藉由此圓盤簧4之彎曲， 主複合開關部3 a之活動接點接觸固定接點，開關部導通 作動。 一解除鍵頂2之按壓，圓盤簧4即藉由本身彈性回復 ，開關部斷開。又，交叉連桿1 3對待回復之板彈簧片 2 4施加勢能，將其拉起，使鍵頂2回復至第1圖之待機 位置。 爲收容此鍵盤開關1於機殼1 4內，一進行關閉蓋 本紙張尺度適用中國國家標準（CNS)A4規格mo X 297公釐） -15 - ----------III ----^----訂--------- (請先閲讀背面之注意事項再填寫本頁) “48456 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（13) 2 9之操作，即藉由蓋2 9之關閉旋轉，與滑件2 6 —起 向左移動之開關片3自第5圖中虛線所示待機位置，滑動 至實線所示最左側之退避位置。 此時，由於開關片3相ϊΐ於安裝在支持板1 8之交叉 連桿1 3向左移動’故嵌合孔1 6之後側緣1 6 a抵接從 動爪片1 5，使內側連桿7之腕部7 a如第3圖，以滑動 突起7 c爲中心，順時鐘旋轉。結果，交叉連桿1 3沈落 ，鍵頂2下降，可使以蓋2 9覆蓋鍵頂2之機殼1 4全體 薄型化。 於第3圖之退避位置，板彈簧片2 4之抵接部2 4 a 收容於開關片3之退避孔1 7內。結果，可在板彈簧片 2 4大致自由狀態下將其收容於機殼1 4內，由於並非保 持彈性變形收容板彈簧片2 4，故不會發生疲勞或塑性變 形。 又，由於抵接板彈簧片2 4之抵接部之圓盤彈簧4及 主複合開P部3 a藉由開關片3朝左側滑動，退避於左側 ，故開關部不會因鍵頂2下降而發生錯誤動作。 由於使用鍵盤開關1 ，故一開啓蓋2 9 |滑件2 6及 開關片3即自第5圖中實線所示退避位置向在朝虛線所示 待機位置滑動。 結果，抵接從動爪片1 5之嵌合孔1 6之後側緣 1 6 a向右後退，解除對從動爪片1 5之拘束。同時，藉 由開關片3滑動，故彈簧片2 4之自由端脫離退避孔1 7 ，抵接部2 4 a彈性接觸於開關片3上。結果，藉由板彈 本紙張尺度適用t國國家標準（CNS)A4規格（210 x 297公釐） -16 - ------------- ----r----^ --------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工湞費合作社印製 4484 5 6 A7 B7 五、發明說明（14) 簧片2 4之彈性’升起交叉連桿1 3 ’鍵頂2回復至待機 位置。又，藉由開關片3滑動，圓盤彈簧4及主複合開關 部3 a回到板彈簧片2 4之抵接部2 4 a下側’鍵開關 1 0全體回復至第1圖之待機位置。 本發明不限於上述實施形態’可作種種變更’例如， 固然藉由蓋之啓閉操作移動開關片1 3 ’惟’亦可相對於 開關片，移動支持扳1 8。 又，使鍵頂2復位之板彈簧片2 4固然兼作全開關部 作動之致動器，惟，亦可在起復位彈簧作用之板彈簧片 2 4外，別設按壓開關部於鍵頂2或交叉連桿1 3之啓動 cm 益。 又，上述實施形態固然使用爲了維持主複合開關部 3 a之導通動作而反轉之圓盤彈簧4，惟其不必設於開關 部。 更且，上述實施形態固然使用圓柱凸輪2 5及從動器 2 6來作爲與蓋之啓閉操作連動而使開關片滑動之連動機 構，惟亦可使用採斜齒輪等之其他連動機構a 如以上說明，根據本發明，在收容鍵頂2於機殼1 4 內之際，可使復位彈簧2 4在接近自由狀態下，退避至鍵 頂2下方，可延長鍵開關之壽命。 又，由於鍵盤開關收納於機殼1 4時，並未設置特別 複雜構造，可利用滑動之開關片3或支持板1 8，使鍵頂 2成下降狀態，故不會干涉關閉鍵頂2之蓋2 9，配置於 蓋2 9背側之液晶顯示器既不會破損|反而藉蓋2 9使鍵 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -17 - -------------裝-----：----訂---------線 (請先閱讀背面之沒意事項再填寫本頁) 4484 5 6 a? _ B7 五、發明說明（15) 頂2不致於破損。 又，由於復位彈簧兼作按壓開關部而使其作動之致動 器，故部件數減少1鍵盤開關之構造簡單化= 又，由於只要滑動開關片，即可使復位彈簧退避，故 可用輕的操作力來啓閉蓋3 又，可不另設導引構件，沿滑動方向導引開關片。 產業上可利用性 如以上’本發明鍵盤開關可用來作爲筆記型電腦，可 攜式電話機等要求薄型化之可攜式電子機器所具備之輸入 裝置。 --------1-----裝-----：----訂· (請先閱讀背面之注意事項再填寫本頁) -線 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中囷國家標準（CNS)A4規格（210 x 297公S > - 18 -4484 5 6 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the Invention (1) Technical Field The present invention relates to keyboard switches for laptop computers with key tops, etc., especially when the lid is opened and closed. Key switch for storing the key top. 2. Description of the Related Art Conventionally, a keyboard switch that lowers and stores a key top is known. Figures 7 to 9 show this conventional keyboard switch. The support plate 1 supporting most key tops 102 is provided with a first link member 1 0 1 a and a first The cross link 101 is composed of two link members 101b. The first link member 1 0 1 a and the second link member 1 0 1 b are formed in a figure 3, respectively, and can be freely connected to each other by the intermediate rotation fulcrum 1 0 1 c. As shown in FIG. 7, the first link member 10 1 a constitutes a hinge end portion 1 1 0 of a support protrusion pivotally mounted on the support plate 107 at one end of the support plate 107 side. The other end of the key top 102 side is fitted with a guide part 105 arranged on the back of the key top 102 to form a movable end part 111 that can move freely from side to side and freely to rotate. In addition, one end of the support plate 1 0 7 side of the second link member 101 b constitutes a moving end portion 1 1 2 pivoted to the fitting long hole, and the other end of the key top 1 0 2 side is rotatably connected to the key top 1. 0 2 Hinge end 1 1 3 on the back. In the standby position shown in FIG. 7 in which the keyboard 102 is in an unpressed state, an inverted cup-shaped rubber elastic part 1 1 4 1 which functions as a return spring is arranged below the key top 1 2 and abuts from the key top 1 0 2 The bottom surface is reset under the pressing part 10 6. Inverted cup-shaped rubber elastic part 1 1 4 is integrally formed by stacking on the switch sheet ------------- installation -----: ---- order --------- (Please read the precautions on the back before filling this page) This paper size applies the China National Standard (CNS) A4 (210 * 297 mm) -4-4484 5 6 A7 B7 Employees ’Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs五 5 'Description of the invention (2) 1 ◦ 3 is formed on the rubber sheet 1 0 4 on the upper side of the inverted cup-shaped elastic part 1 1 4 to the composite switch part 103 as a composite switch part 103. These rubber sheets 104 and the switch sheet 103 are configured to be slid on the support plate 10 as a whole. As soon as the key top 1 〇2 is pressed from the upper side, the key top 1 〇2 is the cross link 1 0 1 guide. The side does not make a large tilt, maintains a substantially parallel state, and descends. As a result, as shown in Figure 8, the key The pressing part 1 of the top 1 0 2 is bent down and the cup-shaped rubber elastic part 1 1 4 is turned on, and the main composite switch part 10 3 a is turned on. The cover covering the plurality of key tops 1 0 2 and the whole 1 1 5 is freely connected to Install the keyboard switch case. As shown in FIG. 9 > As soon as the opening and closing cover 1 1 5 is connected with this closing operation, the rubber sheet 1 0 4 and the switch sheet 1 0 3 are opposite to the support plate 1 0 2 supporting the key top 1 0 7 toward the drawing Slide on the left side, and the inverted cup-shaped rubber elastic portion 1 1 4 retracts to the lower side of the storage recess 1 1 6 of the key top 10 2. With the inverted cup-shaped rubber elastic portion 1 1 4 retreating, the key top 10 2 and the cross link 1 〇 1 are lowered by their own weight, and the whole is lowered. Moreover, even if the key top 1 2 2 is dropped, the main composite switch portion 1 0 3a does not conduct. In this way, if the inverted cup-shaped rubber elastic portion 1 1 4 is retracted from the storage recess 1 1 6 of the key top 1 0 2 when the cover 1 1 5 is closed, that is, for a long period of time when the notebook computer is not used, The inverted cup-shaped rubber elastic portion 1 1 4 of the return spring is not bent, and the notebook computer is thinned when the cover 1 1 5 is closed. However, in the keyboard switch of this structure, since the cover is closed 1 1 5 ------------- installation -----: ---- order --------- --Line f, please read the notes on the back before filling this page) This paper size is applicable to the national standard (CNS) A4 specification (210 X 297 male «)-5-4484 5 6 A7 B7 Employees of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Consumer Cooperative Organization 5. Description of the invention (3) In the state 'return spring (inverted cup-shaped rubber elastic part) 1 i 4 only retreat to a position that avoids interference with the pressing part 1 0 6 of the key top 1 0 2 (receiving recess ) 1 1 6 'Therefore, the distance between the support plate 1 07 and the key top 1 0 2 cannot be less than the height of the free state of the inverted cup-shaped rubber elastic portion 1 1 4, which is the main cause of the thinning limit. Furthermore, since the pressing portion 106 and the accommodating recess 116 are formed on the bottom surface of the key top 10, the key top 100 is enlarged, and the entire keyboard switch 100 is enlarged. Furthermore, the return spring 11 is increased. 4 It is necessary to slide a long distance for the receiving section 1 16 moved to the retreat position, so the mechanism interlocking with the cover 1 15 will be large and complicated. Furthermore, a large operating force is required for the entirety of the rubber piece 104 and the switch piece 103 which are integrally provided with the return spring 1 1 4 to slide. Therefore, although it is also known that only the rubber piece 1 0 4 having the return spring 1 1 4 is slid relative to the switch piece 10 3, only the switch part 1 0 3 a of the main composite switch part 1 0 3 may be operated erroneously. To avoid friction between the rubber sheet 104 and the switch sheet 103, it is necessary to interpose a polyester sheet, etc., so 'becoming a high-priced product 4' The present invention is made by considering these conventional problems, and its purpose is to provide a When closing the cover, the keyboard switch is thin without compressing the return spring. The purpose is to provide a keyboard switch that can move the return spring to the retracted position with a simple structure and can open and close the cover with a light operating force. The invention requires that the paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) -6------------- II ---------- Order- --------- I (Please read the notes on the back before filling out this page) 448456 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (4) The keyboard of the present invention is equipped with accommodation A support plate in the casing is installed between the support protrusion of the support plate and the key top. The cross link that guides the top of the key can be moved up and down freely, avoiding the support protrusion, and slides freely on the support board to form the switch piece of the switch part that is actuated by the key top. Connect the switch piece, the return spring returning the lowered key top to the upper side, and in conjunction with the closing operation covering the key top, make one of the switch piece and the support plate slide relative to the other from the standby position toward the retreat position, while making the key top The keyboard switch of the linkage mechanism in a descending state is characterized in that a retraction hole is formed at a position where the switch piece abuts the return spring in the retreat position, and a part of the return spring is accommodated in the retreat hole. When the key top is pressed in the standby position, the switch section is actuated by lowering the key top, and when the key is released, the key top is raised by the reset spring to release the switch section. As soon as the lid is turned on and off, the switch part is relatively slid to the retracted position. 1 Even if the key top is lowered in conjunction with the switch operation, it will not move. In addition, a part of the return spring falls into the retreat hole of the switch piece and is accommodated in the retreat hole. Even if the contact position is lowered and the key top is lowered, the return spring can maintain the standby position. Another "preferable" keyboard switch further forms a fitting hole in the switch piece for inserting the driven claw piece integrally connected with the cross link, and relatively moves when one of the switch piece or the support plate slides toward the retreat position. The peripheral edge of the fitting hole abuts the driven claw piece, sinks the cross link, and lowers the key top. As soon as the switch or support plate moves from the standby position to the retracted position, the periphery of the fitting hole abuts the driven claw piece, sinks the cross link, and lowers the key top. This paper size applies to National Standards (CNS) A4 Regulations i_ (210 X 297 mm) '------------- Loading -----: ---- Order --- ------ line (Please read the notes on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4484 5 6 A7 B7 V. Description of the invention (5) Therefore, as long as the switch is processed And the cross bar 'can form a linkage mechanism that makes the key top into a lowered state. Also, preferably, the keyboard switch is a reset spring that is an elongated plate spring that is supported on the key top or the cross link, and the free end of the reset spring in the standby position is pushed down by the key top to press the switch piece. , Actuator of the switch section. Since the return spring is also used as an actuator for pressing the switch, the number of parts is reduced, and the structure of the keyboard switch is simplified. Since the actuator is not repeatedly placed on the return spring even in the standby position, the keyboard switch is thinned. Furthermore, preferably, the keyboard switch is further linked with the opening and closing operation of the cover, and the support plate slides between the standby position and the retracted position. Since only the switch portion is formed on the switch piece, it can slide from the standby position to the retracted position with a light operating force. It is also preferable that the keyboard switch is formed on the switch sheet, the sliding direction is a slit in the longitudinal direction, and the support protrusion of the play-embedded support plate guides the switch piece by supporting the protrusion. The switch piece is embedded in the slit by supporting protrusions, and the guide piece is guided in the sliding direction without separately providing a guide member. Brief Description of the Drawings Fig. 1 is a sectional view of a main part of a key top 10 of a keyboard switch 1 in a standby position according to an embodiment of the present invention. Figure 2 shows the state of pressing the key top 2 from the standby position in Figure 1. The paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -8- --------- ---- Install -----: ---- Order --------- line (please read the precautions on the back before filling this page) 44Θ4 5 6 A7 B7 Staff of Intellectual Property Bureau, Ministry of Economic Affairs Printed by the consumer cooperative. Sectional view of the key switch of the invention description (6). FIG. 3 is a cross-sectional view of a main part of the key switch 10 in the retracted position. Fig. 4 is an exploded perspective view showing the components of the key switch 10. Fig. 5 is a plan view of the keyboard switch 1 with the cover 29 opened. Fig. 6 is an enlarged plan view of the main part of the linkage mechanism of Fig. 5. Figures 7 to 9 are diagrams showing a conventional keyboard switch 1 0 0, wherein Figure 7 is a longitudinal sectional view of the main part of the keyboard switch 1 0 0 in the standby position, and Figure 8 is a view showing a key top 1 pressed from the standby position A longitudinal sectional view of the main part in the state of 〇2, and FIG. 9 is a longitudinal sectional view of the main part when the keyboard switch 10 Q is stored. Comparison table of main components 1 keyboard switch 2 key top 3 switch piece 3 a main composite switch part 4 disc spring 5 guide support part 6 U-shaped bearing part 7 inner link 8 outer link 7 a, 8 a wrist part 7 b > 8 c Pivot ------------- — 丨 — l · I 丨 丨 -------- (Please read the precautions on the back before filling this page) This paper Standards are applicable to China National Standard (CNS) A4 specifications (210 X 297 mm) -9- 4484 5 β1 Α7 Β7 V. Description of the invention (7) (Please read the precautions on the back before filling this page) 7 c, 8 b Sliding protrusion 10-key switch lib Punching holes 1 1, 1 2 Supporting protrusion 11 a Long hole 12 a Round hole 13 Cross link 14 Chassis 15 Follower claw piece 1 6 Fitting hole 1 6 a Side hole 17 Escape hole 1 8 Support plate 19 Guide slot 2 2 Link plate 2 4 Leaf spring piece 24a Abutment portion 2 5 Cylindrical cam Printed by employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 25a Cam groove 2 6 Slider 2 6 a Follower 2 7 Slide Corner piece 2 9 Cover 10 0 Keypad switch This paper size is applicable to China National Standard (CNS) A4 (210 x 297 mm) -10-448456 Employees of Intellectual Property Bureau, Ministry of Economic Affairs Printed by Fei Zuozuosha A7 B7 V. Description of the invention (8) l0la 1st link member 101b 2nd link member 10 1c Rotating fulcrum 1 0 2 Key top 103 Switch piece 103a Main composite switch 104 Rubber piece 10 5 Guide 106 Pressing part 107 Supporting plate 110 Hinge end 111 Moving end 112 Moving end 113 Hinge end 114 Inverted cup-shaped rubber elastic part 115 Cover 116 The best form for accommodating recesses to implement the invention FIG. 6 illustrates a keyboard switch 1 according to an embodiment of the present invention. The keyboard switch 1 of this embodiment is a plurality of key switches 1 shown in FIGS. 1 to 4 arranged on a support plate 18 composed of a metal plate, a synthetic resin plate, or the like. Each of the key switches 1 is as shown in FIG. 4. It is shown that the key top 2 and the cross link 1 3 'form the switch of the main composite switch part 3 a. The paper size is applicable to the national standard (CNS) A4 specification (210 X 297 public ""-11,- ------------ Installation ---- K ---- Order --------- Line (Please read the precautions on the back before filling this page) A7 4434 5 6 ____B7_____ 5. Description of the invention (9) The composition of the sheet 3 and the support plate 18. The sprocket switch of this embodiment is used as a key input device of a notebook computer, and is installed on the casing 14 of the notebook computer shown in FIG. 5 | When the notebook computer is not used and is stored, The closing operation of the cover 2 9 installed on the case 1 4 covers the key top 2 of each key switch 10. The key top 2 is made of a synthetic resin molded product such as ABS resin. Behind the bottom of the key top 2 (right side of the first figure), the key top 2 can rotate freely to support a pair of U-shaped bearing portions 6 on the rear side of the inner link 7. On the front side (the left side in FIG. 1), one pair of guide support portions 5 on the front side of the outer link 8 can be rotated and slidably guided, and are integrally formed. The cross link 13 is composed of a combination of a resin inner link 7 and an outer link 8 which are integrally provided with one of the wrist portions 7 a and 8 a parallel to the two sides. The two cross at the center of the two wrist portions 7 a and 8 a. The link can be freely connected in the state = > The cross link 13 is installed between the bottom surface of the aforementioned key top 2 and the support protrusions 1 1 and 12 cut and raised from the support plate 18 to one side of each link 7 and 8 It is the hinge end, and the other side is the moving end, and it is installed, that is, behind the inner link 7 and connected to the pivot 7 b between the wrists 7 a and 7 a. On the front side, the word bearing part 6 is protrudingly provided on the side of the wrist part 7 A, and the sliding protrusion 7 C on the side of the 7 A is embedded in the long hole 1 1 a penetrating the support protrusion 1 1 on the front side. stand by. On the front side of the outer link 8, a sliding projection 8B protruding from the two sides of the connecting plate 2 2 connecting the two wrists 8a rotates and slides in the front-rear direction to fit the guide support portion of the key top 2 freely. 5. On the back side 'This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) — llllt — ll — — — —' 1111111-— — I ----- (Please read the back Please fill in this page again) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4484 5 6 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (10) Projected on the wrist 8 a, 8 a The pivot 8C on the side is embedded in the circular hole 1 2 a ′ provided in the rear supporting protrusion 12 to rotate freely. By connecting the cross link 1 3 between the bottom surface of the key top 2 and the self-supporting plate 1 8 to cut and stand up the supporting protrusions 1 1, 1 2, the key top 2 maintains a horizontal state, and the cross link 13 can move up and down freely to guide lead. On the front side of the wrist portions 7 a and 7 a of the inner link 7, the driven claw pieces 15 are connected in an arc shape at the lower side, which is more inclined than the position supported by the front side support protrusion 11. In addition, at the center of the connecting plate 22 of the outer link 8, an elongated strip-shaped plate spring piece 24 is integrally connected to be slanted downwardly. This leaf spring piece 2 4 is supported behind the connecting plate 2 2 and is punched out on the bottom surface forming the free end side of the lower end to form a round foil-shaped abutment portion 2 4 a on the surface of the elastic contact switch piece 3 as shown in FIG. 7. The standby position is shown. At the position of the switch piece 3 abutted by the abutting portion 24a, a switch portion composed of a main composite switch portion 3a and a disc spring 4 placed thereon is formed. The main composite switch part 3a is formed by movable contacts and fixed contacts printed on the upper and lower flexible sheets, and the upper and lower flexible sheets are interposed and laminated by an insulating spacer, thereby facing each other with a little gap. The disc spring 4 is a one that bends an elastic metal plate into a disc shape, and by bonding the surroundings to a flexible sheet, it is bonded to the main composite switch portion 3a. As shown in FIG. 4, the switch piece 3 slides freely in the front-rear direction relative to the support plate 18 and is arranged on the support plate 18 freely, and guides the protruding positions of the front support protrusions 11 and the rear support protrusions 12. Slot 19, this paper size applies Chinese National Standard (CNS) A4 (210 X 297 mm). 13-------------------. 1-- -Order --------- < Please read the notes on the back before filling out this page) 44B456 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of Invention (11) The front support projection 11 and the rear support projection 12 interfere with each other by cutting upward from the support lever 18 and standing up. The guide slit 19 is in the longitudinal direction in the front-rear direction. 'The width is slightly larger than the thickness of the front-side support protrusions 1 1 and the rear-side support protrusions 1 2. , Slide forward and backward. The fitting hole 16 of the driven claw piece I5 inserted through the inner link 7 is connected to the guide slit 19 and is inserted through the guide slit 19 of the front side support protrusion 11. When the switch piece 3 slides forward (toward the retreat position), the driven claw piece 15 abuts the rear edge 16 a of the fitting hole 16 and pushes upwards to make the wrist portion 7 of the inner link 7 a , 7 a rotates in the insertion direction with the sliding protrusion 7 c as the center. In addition, when the switch piece 3 slides to the forward retreat position, at the position where the contact portion 2 4 a of the leaf spring piece 2 4 elastically contacts the switch piece 3, that is, at a later position of the main composite switch portion 3 a, A circular retraction hole 17 is provided to receive a part of the leaf spring piece 24 in the retraction position. The support plate 18 is fixedly accommodated in the casing 14 and each key switch 1 is cut and erected at the corresponding position to a pair of the front support protrusions 11 and the rear support protrusions 12 respectively. Before punching, the punching hole 1 1 b formed by the front support protrusion 11 is shown in FIG. 1. In the standby position, the front end of the driven claw piece 15 of the inner link 7 inserted through the fitting hole 16 is received. As shown in Figs. 5 to 6, the switch piece 3 is provided in a connecting mechanism connected to the cover 2 9 of the chassis 14 and is linked with the opening and closing operation of the cover to slide forward and backward. This conversion mechanism has a pivot uranium integrated spinner supporting the freely supporting cover 29. The paper size is applicable to the Chinese National Standard < CNS) A4 specification (210 x 297 mm) -14------ r --- order- ------- 1 (Please read the notes on the back before filling out this page) 44845 6 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (12) Cylindrical cam 2 5 The follower 2 6 a of the slider 26 is inserted into the cylindrical cam groove 2 5 a penetrating the cylindrical cam 25. The sliding corner piece 2 7 formed by the metal sheet in an inverse L-shape is bonded to the sliding piece 2 6 and held. The upper and left edges of the fixed switch piece 3 in the figure are in a groove bent along the inside of the sliding corner piece 2 7. , So that the flexible switch piece 3 slides together with the sliding corner piece. Result | Cover 2 9 —With the opening and closing operation, the slider 2 6 moves back and forth (in the circle, left and right) back and forth, and the switch 3 and the slider 2 6 slide back and forth. The operation of the keyboard switch 1 thus configured will be described below. The first figure shows that the cover 2 9 is opened and no pressing force is applied to the standby position of the key top 2 'The input operation of the display key switch is in a standby state. In this standby position, the abutment portion 2 4 a of the leaf spring piece 2 4 is elastically connected to the disc spring 4 1 and the outer link 8 is raised upward. As a result, the key top 2 is supported at the highest position by the cross link 1 3. As soon as the key top 2 is pressed, the key top 2 is lowered while maintaining the horizontal state by the cross link 13. As shown in Fig. 2, the contact portion 2 4 a of the leaf spring piece 24 is pressed to bend the disc spring 4. By the bending of the disc spring 4, the movable contact of the main composite switch section 3a contacts the fixed contact, and the switch section is turned on and operated. As soon as the pressing of the key top 2 is released, the disc spring 4 is elastically restored by itself, and the switch section is turned off. In addition, the cross link 13 applies potential energy to the leaf spring piece 2 4 to be restored, and pulls it up to return the key top 2 to the standby position in FIG. 1. In order to accommodate the keyboard switch 1 in the case 14 and the cover is closed, the paper size applies the Chinese National Standard (CNS) A4 specification mo X 297 mm) -15----------- III- --- ^ ---- Order --------- (Please read the notes on the back before filling out this page) "48456 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention ( 13) The operation of 2 9 is to close the cover 2 9 and rotate it with the slider 2 6 to move the switch piece 3 to the left from the standby position shown by the dotted line in FIG. 5 and slide it to the far left as shown by the solid line. At this time, since the switch piece 3 faces the cross link 13 mounted on the support plate 18 and moves to the left, the side edge 1 6 a of the fitting hole 16 abuts the driven claw piece 1 5 As shown in Fig. 3, the wrist part 7a of the inner link 7 is rotated clockwise with the sliding protrusion 7c as the center. As a result, the cross link 13 sinks and the key top 2 drops, so that the cover 2 9 can be covered. The entire casing 14 of the key top 2 is thinner. At the retracted position in FIG. 3, the contact portion 2 4 a of the leaf spring piece 2 4 is housed in the escape hole 17 of the switch piece 3. As a result, the leaf spring Sheet 2 4 roughly free state When it is housed in the case 14, it does not retain the elastic deformation and accommodates the leaf spring piece 24, so fatigue or plastic deformation does not occur. In addition, the disc spring 4 is in contact with the contact portion of the leaf spring piece 24. And the main composite opening P part 3 a slides to the left by the switch piece 3 and retreats to the left, so that the switch part will not malfunction due to the key top 2 falling down. Since the keyboard switch 1 is used, the cover 2 9 is opened once The pieces 2 6 and the switch piece 3 slide from the retreat position shown by the solid line in FIG. 5 toward the standby position shown by the dotted line. As a result, the side edge 1 6 of the abutting hole 16 of the driven claw piece 15 abuts. a Retreat to the right to release the restraint on the driven claw piece 15. At the same time, by sliding the switch piece 3, the free end of the spring piece 24 is detached from the escape hole 17 and the abutment portion 2 4 a elastically contacts the switch piece 3. Above, the national standard (CNS) A4 specification (210 x 297 mm) is applied to the paper size of the tablet. -16-------------- ---- r ---- ^ --------- (Please read the precautions on the back before filling out this page) Printed by the Intellectual Property Office of the Ministry of Economic Affairs, Staff Cooperatives 4484 5 6 A7 B7 V. Description of the invention (1 4) The resilience of the reed 2 4 'lift cross link 1 3' key top 2 returns to the standby position. Moreover, by sliding the switch sheet 3, the disc spring 4 and the main composite switch part 3 a return to the leaf spring sheet 2 4 abutment portion 2 4 a The lower side of the 'key switch 10' is returned to the standby position in Fig. 1. The present invention is not limited to the above embodiment, "various changes can be made", for example, although it is moved by the opening and closing operation of the cover Switch piece 1 3 'Wei' can also move the support piece 1 8 relative to the switch piece. In addition, the leaf spring piece 2 4 for resetting the key top 2 also serves as an actuator for operating the full switch portion, but it is also possible to provide a pressing switch portion on the key top 2 in addition to the leaf spring piece 2 4 functioning as a return spring. Or the starting cm benefit of the cross link 1 3. It should be noted that although the above embodiment uses the disc spring 4 which is reversed in order to maintain the ON operation of the main composite switch section 3a, it is not necessary to provide the disc spring 4 in the switch section. Furthermore, although the above-mentioned embodiment uses the cylindrical cam 25 and the follower 26 as the interlocking mechanism for sliding the switch piece in conjunction with the opening and closing operation of the cover, other interlocking mechanisms such as helical gears can also be used. As described above, according to the present invention, when the key top 2 is accommodated in the casing 1 4, the return spring 24 can be retracted under the key top 2 in a near-free state to extend the life of the key switch. In addition, since the keyboard switch is housed in the case 14, there is no particularly complicated structure. The sliding switch piece 3 or the support plate 18 can be used to make the key top 2 into a lowered state, so it will not interfere with closing the key top 2. Cover 2 9 and the LCD display on the back side of cover 2 9 will not be damaged. Instead, the cover 2 9 makes the paper size applicable to China National Standard (CNS) A4 (210 X 297 mm) -17-- ----------- Installation -----: ---- Order --------- line (please read the unintentional matter on the back before filling this page) 4484 5 6 a? _ B7 V. Description of the invention (15) The top 2 will not be damaged. In addition, since the return spring doubles as an actuator that presses the switch part, the number of parts is reduced by one. The structure of the keyboard switch is simplified. Also, since the return spring can be retracted by sliding the switch piece, light operation is possible. The cover 3 can be opened and closed by force, and the switch piece can be guided along the sliding direction without providing a guide member. Industrial Applicability As described above, the keyboard switch of the present invention can be used as an input device of a portable electronic device such as a notebook computer, a portable telephone, and the like, which requires thinning. -------- 1 ----- Installation -----: ---- Order · (Please read the precautions on the back before filling out this page) Printed paper size applies to China National Standard (CNS) A4 (210 x 297 male S >-18-