1237283 (1) 玖、發明說明 【發明所屬之技術領域】 本發明’是有關使用在電子機器之按壓式開關，詳細 而言’是關於藉由內藏之線圈彈簧兩端各別與接觸端子的 接合開離來進行開（ON )/關（OFF )之開關。 【先前技術】 內藏有導電性線圈彈簧，與設置在筐體內面之接觸端 子可接合開離自如之接觸片，進行開（ON )/關（OFF ) 之開關者，例如有日本特公平7 - 93074號公報所記載之 『開關』（先前技術1 )。並且，先前技術1中之『開 關』，記載有『（該申請專利範圍第1項）之開關，是 由：形成大致呈四角升斗狀，將固定端子以呈平面狀設於 內部底面之外殼；以及具備有彈性由導電構件所成而彎曲 成U字型’且於更前端具有大致彎曲呈半圓狀之接點部的 可動端，與以大致呈直線狀而於前端具有接點部的固定端 之線圈彈簧之接觸片；以及由成型構件所成大致呈一棒 狀，在一端有门字型的溝，使該门字型溝跨於上述接觸片 之可動端而於縱長方向上滑動之操作體；以及結合於上述 外殼’用以保持操作體使之能夠滑動之同時，使接觸片之 線圈部可受上述外殻所夾持之殼蓋等所組成』。 先前技術1，如第1 5圖所顯示地，於外殻1 1 1內之 底面設有固定端子112、113。並且，在外殻111內，設 有接觸片1 1 4，該接觸片1 1 4是由具備彈性之導電構件所 -5 - (2) 1237283 成，使線圈彈簧狀之彈簧部1 1 4e的一端彎曲呈u字 其前端具有再彎曲大致呈半圓狀之接點部1 1 4c的可 1 1 4b，而另一端則具有以大致呈直線狀在前端與上述 端子1 12接觸之接點部1 14d的固定端114a所形成。 操作體115，爲大致呈棒狀，於一端具有Π字型 115a，使該溝115a跨於上述接觸片114之可動端1P 縱長方向上滑動，讓接點部114c與上述固定端子11 接觸/分離。 殼蓋116，是在外殻111上部內，將接觸片114 內包之蓋體。殼蓋1 1 6，具有能夠保持使操作體1 1 5 之保持孔116a，並具有與上述外殼ill結合，與外殼 之U字型凹陷1 1 la —起將接觸片1 14之線圈部1 14e 夾持之突部1 16b。 如此所形成的先前技術1，將操作體1 1 5向下 壓’抗過接觸片114之彈力而滑動，使可動端114b 方移動。此時，可動端114b，係以和接觸端子112 之接點部1 1 4d作爲支點，藉由使彈簧部n 4e朝向線 簧之捲繞方向移動，利用線圈彈簧之彈力與可動端 之彎曲而移動。接點部1 1 4 c，是利用當可動端11 4 b 方移動而朝第15圖之中間橫向方向移動，移動至固 子113位置而與固定端子113接觸，使固定端子112 定端子1 1 3成爲導通狀態。 又，結束操作體115之押壓，藉由接觸片114本 彈力而回復到原始位置，使接點部1 1 4c由固定端子 型， 動端 固定 之溝 ic於 3可 予以 滑動 111 予以 方押 朝下 接觸 圈彈 1 14b 向下 定端 與固 身的 -6 - 113 (3) 1237283 離脫，使固定端子Η 2與固定端子1 1 3成爲絕緣狀態。 然而，先前技術1之開關，使操作體1 1 5向下方滑 動’讓接觸片114之固疋_ 114a及可動_ 114b與固定端 子112及固定端子113接觸，朝下方移動所需要的抵抗操 作壓力，以及接觸端子112與固定端114a之接觸和接觸 端子113與可動端11 4b之接觸所需要之接觸壓力，是由 朝向接觸片1 1 4之彈簧部1 1 4 e的捲繞方向扭轉之彈性力 所造成。 如此地，朝向線圈彈簧之捲繞方向扭轉所產生之彈性 力，由於是依據其扭轉量而變化，所以若要將接觸片與固 定端子之接觸壓保持在一設定値是相當困難的。 尤其是對於，在偵測CD播放機或電腦的CD托盤等 之位置等各種電子機器所使用之位置偵測用的按壓開關 中，押壓按壓開關所使用之操作力爲〇，且接觸片與固定 端子之接觸壓以某一設定値爲理想，但在先前例中，由於 使押壓按壓開關之操作力變小時，接觸片與固定端子之接 觸壓亦變小，對於實現設定之接觸壓，具有必須增大操作 力之問題點。亦即，當操作力變小時，接觸壓亦變小，接 觸片與固定端子在接觸開始位置上之接觸壓，與接觸後接 觸片更再移動時點下之接觸壓有所不同，造成在接觸開始 位置之接觸抵抗較大，與判斷爲導通之位置產生誤差，而 有偵測位置之精度不良之問題。 又再者，利用操作體對接觸片之操作方向，由於是讓 接觸片朝線圈彈簧的捲繞方向變形，所以要縮短開關之操 (4) 1237283 作方向上的長度乃爲困難。 本發明，有鑑於此等問題點，其目的是在於提供一種 接觸壓之變化不易隨接觸片位置而變化之開關。 【發明內容】 本發明之開關，是由：呈筐體形狀之外殼；及一端形 成有露現於外殼內面之接觸部，另一端位於外殼外部而設 的一對固定端子；及由設於外殼內部，一端形成有與固定 端子保持恆常接觸之固定接觸部，另一端形成能夠與另一 固定端子接觸之可動接觸部，於其中間部在線圈捲繞方向 上以及壓縮方向上具有彈性之線圈彈簧所成之接觸片；以 及一端位於外殼內，形成有能夠將接觸片朝壓縮方向押壓 之壓按部，另一端位於外殼外部，形成有由外部被押壓之 作用部的操作體所構成。 並且，被設置於外殼內之接觸片，其一端之固定接觸 部與固定端子保持恆常連接，另一端之可動接觸部藉由線 圈彈簧於扭轉方向上之彈性力而強壓接觸於外殼內壁，位 於與另一固定端子能夠接觸之位置上，但在通常狀態下並 不接觸。 於此狀態下，當將操作體之作用部壓下時，操作體便 朝外殼內部方向移動。如此一來操作體之壓按部便將接觸 片之線圈彈簧朝壓縮方向壓按使之壓縮。 接觸片，其操作體被壓下，使得可動接觸部受到線圈 彈簧於扭轉方向上之彈性力而一面接觸於外殼內壁而移 - 8 - 1237283 (5) 動，然後與另一固定端子接觸。 開關’其接觸片之固定接觸部及可動接觸部在與各個 固定端子接觸下’使固定端子呈接連而成電氣性導通狀 態。 當操作體對作用部之押壓被解除時，接觸片藉由線圈 彈簧於壓縮方向之彈性力而伸張，回復到初期之位置。因 此，操作體亦藉由線圈彈簧於壓縮方向之彈性力而移動至 原來位置。 【實施方式】 〔本發明之最佳實施形態〕 符號1，是本發明之第1實施形態的開關。開關1， 爲使用於各種電子機器之位置偵測用的按壓開關，例如， 在音響或電腦用之CD播放機等作爲可動構件，用以偵測 CD托盤位置之可動位置等而使用者。開關1，如第1圖 至第6圖所顯示，是由：一方是由呈開口大致爲筐體形狀 所成的外殼本體2a與覆蓋外殻本體2a之開口之蓋體2b 所成之外殼2 ;在外殼2內，於外殻2的底面2c使接觸 部3a露出而設置之第1固定端子3;在外殻2內，於外 殼2的側面使接觸部4a露出而設置之第2固定端子4 ; 中間部由線圈彈簧狀所成，兩端藉由彈簧在扭轉方向的彈 性力而在外殻2內與側面2 d接觸之接觸片5 ;以及能夠 從外殼2外部將接觸片5予以押壓的操作體6所組成。 外殻2，其外殻本體2 a是由樹脂所形成，於底面2 a -9- (6) 1237283 之端部，朝上面方向突設有用以定位接觸片5位置之突起 2e，蓋體2b是由金屬板所形成。對於在蓋體2b，將蓋體 2b覆蓋於外殼本體2a之開口時，位於與突起2e上部不 同之外殼本體2 a端部側的位置處，開設有能夠貫穿操作 體6之孔2f。 第1固定端子3，其一端形成平面狀之接觸部3a，另 一端形成連接端子3 b。 第2固定端子4，其一端形成平面狀之接觸部4a，另 一端形成連接端子4b。 並且，第1固定端子3及第2固定端子4，係使其連 接端子3b及連接端子4b突出至外殼本體2a之外部，使 接觸部3a露現於外殻本體2a內部之底面2c，並且使接 觸部4a以露現於外殼本體2a內部之側面2d之方式，與 外殻本體2a共同以插入成形方式一體成型。 接觸片5，是由導電性構件所成，中間部係形成有呈 線圈彈簧形狀之線圈彈簧部5 a。線圈彈簧部5 a，如第8 圖所示’朝線圈之捲繞方向具有彈性之同時，對圖式中以 箭頭C顯示之壓縮方向亦具有彈性。從線圈彈簧部5 a延 伸設置之接觸片5的一端，形成有固定接觸部5b。固定 接觸部5b，是使線圈彈簧部5a的一端設成直線狀。再 者’接觸片5的另一端，則形成可動接觸部5 c。可動接 觸部5e，是將前端設爲彎曲部5d而彎折呈L字型，再 者’由彎曲部5d起形成爲前端直線部5e。 操作體6，是由能夠貫穿於開設在蓋體2b之孔2f的 -10- (7) 1237283 棒狀體所成，在呈貫通過蓋體2b之狀態下’使位於外殼 2之外部一端形成壓按部6a，使位於外殼2內位置之另一 端形成作用部6b。壓按部6a，是作爲位置偵測之對象’ 例如是受CD托盤等而被押壓的部位。作甩部6b ’其前端 形成有门字型的溝6c。並且，操作體6，是使作用部6b 以位於外殼2內之方式，在插入於蓋體2 b之狀態下，將 可動接觸部5c之前端直線部5e插入於门字型的溝6c而 設。 並且，接觸片5，如各圖所顯示，是將固定接觸部5 b 作爲底面2c側，使突設在外殼2內之突起2e得以插入於 線圈彈簧部5a之中空部位置，並使固定接觸部5b及可動 接觸部5c朝向線圈彈簧部5a捲繞方向之壓縮狀態下被插 置於外殼本體2a內。因此，接觸片5，其固定接觸部5b 係擋接於設置在外殼2內之底面2c處的第1固定端子3 的接觸部3 a，其可動接觸部5 c則位於設在外殼2內之側 面2d處之第2固定端子4之接觸部4a的上側位置。再 者，使操作體6處於被插通於蓋體2b之孔2f的狀態下， 讓可動接觸部5 c之前端直線部5 e插入在门字型之溝 6c。在此狀態下，再將蓋體2b以閉塞住外殼本體2a開口 側方式予以安裝固定。因此，由於如此地，使蓋體2b被 安裝於外殼本體2a，線圈彈簧在操作體6與底面2c之間 朝壓縮方向C而被壓縮，因而使得固定接觸部5b，藉由 線圈彈簧部5a在壓縮方向C上之彈性而維持接觸狀態。 再者，可動接觸部5 c，亦位於設在側面2 d之接觸部4 a -11 - (8) 1237283 的上側位置，藉由線圈彈簧部5 a於捲繞方向上之彈性力 而呈被強壓於側面2d之接觸狀態。 以下，說明第1實施形態之作用。 開關！，是被安裝在電路基板等一定位置之狀態下， 以壓按操作體6之壓按部6a。 如此一來，操作體6，便朝蓋體2b之孔2f內做滑動 移動。當操作體6 —滑動移動，由於可動接觸部5c的前 端直線部5 e被插卡在操作體6的溝6c中，使得接觸片5 的線圈彈簧部5a朝向箭頭C方向做壓縮移動之同時，由 於對接觸片5的作用點是離線圈彈簧部5a有些距離之前 端直線部5 e，所以使線圈彈簧部5 a折屈。並且使可動接 觸部5c的彎曲部5d，一面接觸於外殼本體2a內的側面 2d而移動，不久之後便與固定端子4的接觸部4a接觸， 接觸片5便使第1固定端子3及第2固定端子4呈電氣性 導通狀態。此時，固定端子4之接觸部4a與可動接觸部 5c之彎曲部5d的接觸壓，是來自於線圈彈簧部5a於捲 繞方向的彈性力，所以當受到操作體6而下壓移動時的接 觸壓變化大致沒有壓力變化而約略爲零。 當壓按部6a的壓按被解除時，操作體6受到彈簧部 5 a之箭頭C方向的彈性力而回復到原始位置，可動接觸 部5c的彎曲部5d亦朝各圖中的上方移動而解除與第2固 定端子4之接觸部4a的接觸。 第1實施形態的開關1，其動作方向爲線圈彈簧部5 a 之捲繞方向’以下則依據第9圖至第14圖，說明動作方 -12- 1237283 Ο) 向也能夠是與線圈彈簧部5a之捲繞方向呈直角來動作之 開關1的第2實施形態。 第2實施形態之開關1，並沒有設置蓋體2b，而是使 設操作體6兼做蓋體2b。 亦即，操作體6，是由和外殼本體2a之開口大致相 同形狀的板狀體所構成，在操作體6的上面端部，形成有 平穩傾斜呈山狀突出的壓按部6a。再者，與操作體6之 壓按部6a相反側的兩側部，突設有使壓按部6a側能夠擺 動而作爲擺動中心的中心突起6d。在與操作體6之壓按 部6a相反的面，在安裝外殼本體2a時爲擋接於彈簧部 5 a及可動接觸部5 c，使得該反對面形成爲作用部6b。 又，操作體6所卡止之外殼本體2a，是與第1實施 形態相同樣地，爲一方呈開口之大致形成一筐體形狀。同 樣地，第1固定端子3亦與第1實施形態相同樣，以設有 接觸部3a及連接端子3b而形成，再者，第2固定端子4 亦以設有接觸部4a及連接端子4b而形成。並且，第1固 定端子3及第2固定端子4，是與第1實施形態相同樣 地’使連接端子3b及連接端子4b突出至外殼本體2a之 外部，使接觸部3a露現於外殼本體2a內部之底面， 並且，使接觸部4a以露現於外殻本體2a內部側面2d之 方式’與外威本體2a问時藉由插入成型而一體成型。 如此地，與第1實施形態同樣爲一體成型之外殻本體 2a，與第1實施形態不同處，是於底面2c突出有突起一 該側的兩側面2d，2 g上部，開設有能夠使操作體6之中 -13· (10) 1237283 心突起6d插通的安裝孔2 h而形成。因此，對於外殻本 體2a，除了設有安裝孔2 h之外，其餘則與第1實施形 態相同。 再者，接觸部4a也與第1實施形態相同，設有線圈 彈簧部5 a、固定接觸部5 b、可動接觸部5 c、彎曲部5 d， 以及前端直線部5 e而形成。 並且，第2實施形態的開關1，與第1實施形態相同 樣地，於外殼本體2a內以設置有接觸片5之狀態下，將 操作體6之中心突起6d插入於外殼本體2a之安裝孔 2h，使操作體6能擺動自如地安裝於外殼本體2a。在此 狀態下，接觸片5在箭頭C的方向上並未被壓縮而呈安定 狀態，且由於線圈彈簧部5 a之彈性力是朝捲繞方向，在 如此變形狀態下設置於外殼本體2a，使設在接觸片5之 可動接觸部5c的彎曲部5d呈壓按於外殼本體2a之側面 2d之狀態。並且，操作體6在被載置於接觸片5之線圈 彈簧部5 a及可動接觸部5 c上的狀態下，使得壓按部6 a 呈突出於外殻本體2a上部之狀態。 如此所形成的第2實施形態之開關1，當操作體6之 壓按部6 a被壓下時，操作體6以中心突起6 d爲中心朝向 外殼本體2a之底面2c側擺動。如此一來’與第1實施形 態相同樣地，在外殼本體2 a內，接觸片5之可動接觸部 5c沿著側面2d朝底面2c側移動之同時’線圈彈簧部5a 僅一面稍做壓屈，同時朝底面2 c側被壓縮’不久’可動 接觸部5c之彎曲部5d便與設置在外殼本體2a之側面2d -14- (11) 1237283 的第2固定端子4之接觸部4a相接觸，使得接觸片5與 第1固定端子3及第2固定端子4爲電氣性導通狀態。 當解除對壓按部6a之下壓時，操作體6藉由彈簧部 5a作用於箭頭C方向之彈性力而回復到原來位置，可動 接觸部5c之彎曲部5d亦朝各圖中上方移動，解除與第2 固定端子4之接觸部4a的接觸。 因此’在第2實施形態中，將操作體6設爲擺動自 如，由於作用部6b使線圈彈簧部5 a及可動接觸部5 (:壓 縮而移動，施予開關1的動作，可以是從開關1上方朝向 底面2c之方向，也就是受到線圈彈簧部5a在壓縮方向的 壓按力，或者也可以是平行於開關1上面之方向，也就是 對操作體6之壓按部6a其斜面側押壓以水平方向的壓按 力亦可。若是藉由平行於開關1上面之方向的壓按力而使 之動作之情形時，壓按於壓按部6a斜面上之壓按力的其 中一部分，被變換成使操作體6朝底面2c側擺動的擺動 力’而成爲將線圈彈簧部5a朝壓縮方向壓縮的壓按力。 又’在第2實施形態中，對於操作體6，雖然並沒有 將接觸片5以朝向外殼本體2a之底面2c方向呈壓縮狀態 來安裝，但在將操作體6安裝至外殼本體2a時，也可以 在作用部6b側之操作體6及外殼本體a上部，設置限制 作用部6b朝外殼本體2a上方滑動之卡止凹部及卡止凸 部’使接觸片5之線圈彈簧部5a在朝向底面2c方向呈被 壓縮之狀態下，將操作體6安裝於外殼本體2a亦可。 (12) 1237283 〔產業上之利用可能性〕 依據本發明，由於以上述方式形成開關，由於在動作 時線圈彈簧部在捲繞方向上幾乎沒有變形，使得接觸片在 與固定端子接觸後之接觸壓，無關於操作體的移動變化量 而大致爲一定。因之，由於不會發生接觸片在與固定端子 呈導通狀態之接觸開始位置時的接觸壓，與接觸後接觸片 更加移動時之接觸壓不同，而誤判導通狀態造成位置上之 誤差，所以能夠改善偵側位置之精度。 並且，由於能夠使接觸片在對線圈之直徑方向沒有變 化下而動作，所以能夠使線圈彈簧部之線圈直徑方向與接 觸片之開關動作方向，爲不同方向之方式來設置接觸片’ 所以可以縮小開關動作方向之長度。 【圖式簡單說明】 第1圖是顯示本發明之第1實施形態的平面說明圖° 第2圖是相同發明之正面說明圖。 第3圖是相同發明之右側面說明圖。 第4圖是第1圖之A — A線的剖面說明圖。 第5圖是第1圖之B — B線的剖面說明圖。 第6圖是將第1實施形態中之一部分去除狀態下的1 體說明圖。 第7圖是該第6圖之平面說明圖。 第8圖是顯示第1實施形態之零件的立體說明圖。 第9圖是本發明之第2實施形態的立體說明圖。 -16 - (13) 1237283 第10圖是該第9圖之正面說明圖。 第11圖是該第9圖之平面說明圖。 第1 2圖是該第9圖之右側面說明圖， 第1 3圖是第1 1圖之D - D線的剖面說明圖 第1 4圖是第1 0圖之E — E線的剖面說明圖 第1 5圖是先前技術的說明圖。 主要元件符號對照表 1 :開關 2 :外殼 2a :外殼本體 2b :蓋體 2c :外殼的底面 2 d、2 g :外殼內的側面 2e :突起 2f :孔 2 h :安裝孔 3 :第1固定端子 3 a :接觸部 3 b :連接端子 4 :第2固定端子 4a :接觸部 4b :連接端子 5 :接觸片 -17- 1237283 (14) 5 a :線圈彈簧部 5 b ·固疋接觸部 5 c :可動接觸部 5 d :彎曲部 5 e :前端直線部 6 :操作體 6 a .壓按部 6b :作用部 6 c ··溝 6 d ··中心突起 1 1 1 :外殼 111a：凹陷 1 1 2、1 1 3 :固定端子 1 1 4 :接觸片 1 14b :可動端 1 14e :彈簧部（線圈部） 1 1 4 c、11 4 d :接點部 1 1 5 :操作體 115a：溝 1 1 6 :殼蓋1237283 (1) 发明 Description of the invention [Technical field to which the invention belongs] The present invention 'is related to a push switch used in an electronic device, and in detail' is about the two ends of a coil spring and a contact terminal each by a built-in coil spring The ON / OFF switch is engaged by opening and closing. [Prior technology] A conductive coil spring is built in, and a contact piece that can be opened and closed can be connected to a contact terminal provided inside the casing, and an ON / OFF switch can be used. For example, Japan Fair 7 -"Switch" described in Japanese Patent No. 93074 (prior art 1). In addition, the "switch" in the prior art 1 is described as "(the item in the scope of patent application No. 1), which is formed by forming a substantially quadrangular bucket shape, and fixing the terminal in a flat shape on the inner bottom surface. And a movable end having elasticity made of a conductive member and bent into a U-shape, and having a substantially curved semicircular contact portion at the further end, and a fixed portion having a substantially straight line with a contact portion at the front end The contact piece of the coil spring at the end; and a rod-shaped groove formed by the molding member, with a gate-shaped groove at one end, so that the gate-shaped groove slides in the longitudinal direction across the movable end of the contact piece And an operating body combined with the above-mentioned housing 'for holding the operating body so as to be able to slide, so that the coil part of the contact piece can be composed of the cover and the like held by the above-mentioned housing'. In the prior art 1, as shown in FIG. 15, the fixed terminals 112 and 113 are provided on the bottom surface inside the housing 1 1 1. In the housing 111, a contact piece 1 1 4 is provided. The contact piece 1 1 4 is made of a conductive member having elasticity -5-(2) 1237283, and one end of the coil spring-like spring portion 1 1 4e is formed. It is bent in a U shape, and its front end has a contact portion 1 1 4c which is curved in a substantially semicircular shape, and the other end has a contact portion 1 14d which contacts the terminal 1 12 in a substantially straight shape at the front end. Is formed by the fixed end 114a. The operating body 115 is substantially rod-shaped and has a Π-shaped 115a at one end. The groove 115a slides across the movable end 1P of the contact piece 114 in the longitudinal direction, so that the contact portion 114c contacts the fixed terminal 11. Separation. The case cover 116 is a cover body that encloses the contact piece 114 in the upper part of the case 111. The housing cover 1 1 6 has a holding hole 116a capable of holding the operating body 1 1 5 and has a U-shaped depression 1 1 la combined with the above-mentioned housing ill and a U-shaped recess 1 1 e of the housing together with the coil portion 1 14e Clamping protrusions 1 16b. In the prior art 1 thus formed, the operating body 1 1 5 is pushed down 'to slide against the elastic force of the contact piece 114 to move the movable end 114b side. At this time, the movable end 114b uses the contact portion 1 1 4d of the contact terminal 112 as a fulcrum, moves the spring portion n 4e toward the winding direction of the wire spring, and uses the elastic force of the coil spring and the bending of the movable end. mobile. The contact portion 1 1 4 c is moved when the movable end 11 4 b moves toward the middle lateral direction of FIG. 15, moves to the position of the solid 113 and contacts the fixed terminal 113, so that the fixed terminal 112 is the fixed terminal 1 1 3 is turned on. In addition, the pressing of the operating body 115 is ended, and the original position of the contact piece 114 is restored to the original position, so that the contact portion 1 1 4c is of a fixed terminal type, and the movable end fixed groove ic can be slid at 3 to 111. The downward contact ring spring 1 14b is detached from the fixed end -6-113 (3) 1237283, and the fixed terminal Η 2 and the fixed terminal 1 1 3 are insulated. However, the switch of the prior art 1 causes the operating body 1 1 5 to slide downward to allow the fixed _ 114a and movable _ 114b of the contact piece 114 to contact the fixed terminal 112 and the fixed terminal 113 and move downward to resist the operating pressure. And the contact pressure required for contact between the contact terminal 112 and the fixed end 114a and contact between the contact terminal 113 and the movable end 11 4b is the elasticity of twisting in the winding direction of the spring portion 1 1 4 e of the contact piece 1 1 4 Caused by force. In this way, since the elastic force generated by twisting in the winding direction of the coil spring changes depending on the amount of twisting, it is quite difficult to maintain the contact pressure between the contact piece and the fixed terminal at a set value. In particular, for position detection push switches used in various electronic devices such as detecting the position of a CD player or a computer's CD tray, etc., the operating force used to press the push switch is 0, and the contact piece and the The contact pressure of the fixed terminal is ideally set to a certain value, but in the previous example, because the operating force of the pressing switch was made small, the contact pressure between the contact piece and the fixed terminal was also reduced. For the set contact pressure, There is a problem that the operating force must be increased. That is, when the operating force becomes smaller, the contact pressure also becomes smaller. The contact pressure between the contact piece and the fixed terminal at the contact starting position is different from the contact pressure at the point when the contact piece moves again after the contact, resulting in the contact beginning. The contact resistance of the position is large, and an error occurs with the position judged to be conductive, and the accuracy of the detected position is poor. Furthermore, since the operating direction of the contact piece by the operating body is to deform the contact piece in the winding direction of the coil spring, it is difficult to shorten the length of the operation of the switch (4) 1237283. The present invention has been made in view of these problems, and an object thereof is to provide a switch in which the change in contact pressure is not easily changed with the position of the contact piece. [Summary of the invention] The switch of the present invention is composed of: a housing in the shape of a casing; and one end is formed with a contact portion exposed on the inner surface of the housing, and the other end is a pair of fixed terminals provided outside the housing; Inside the housing, one end is formed with a fixed contact portion that keeps in constant contact with the fixed terminal, and the other end is formed with a movable contact portion that can contact the other fixed terminal. The middle portion has elasticity in the coil winding direction and compression direction. A contact piece formed by a coil spring; and one end is located in the housing, and a pressing part capable of pressing the contact piece in a compression direction is formed, and the other end is located outside the housing, and an operating body is formed with an externally pressed acting part. Make up. In addition, the contact piece provided in the housing has a fixed contact portion at one end which is constantly connected to the fixed terminal, and a movable contact portion at the other end is in strong contact with the inner wall of the housing by the elastic force of the coil spring in the torsion direction. It is located in a position that can be contacted with another fixed terminal, but it is not contacted in a normal state. In this state, when the action part of the operation body is depressed, the operation body moves toward the inside of the housing. In this way, the pressing portion of the operating body presses the coil spring of the contact piece in the compression direction to compress it. The operating part of the contact piece is pressed down, so that the movable contact portion is moved by the coil spring in the torsion direction while contacting the inner wall of the housing-8-1237283 (5), and then contacting another fixed terminal. The fixed contact portion and the movable contact portion of the switch ' s contact piece are brought into electrical connection with the fixed terminals under contact with the respective fixed terminals. When the pressing force of the operating body on the acting portion is released, the contact piece is stretched by the elastic force of the coil spring in the compression direction, and returns to the initial position. Therefore, the operating body is also moved to the original position by the elastic force of the coil spring in the compression direction. [Embodiment] [A preferred embodiment of the present invention] Symbol 1 is a switch according to a first embodiment of the present invention. The switch 1 is a push switch used for position detection of various electronic devices, for example, a CD player for a stereo or a computer is used as a movable member for detecting a movable position of a CD tray position and the like. The switch 1, as shown in FIGS. 1 to 6, is composed of a housing 2 formed by a housing body 2 a having an opening in a substantially box shape and a cover 2 b covering the opening of the housing body 2 a. The first fixed terminal 3 provided in the case 2 to expose the contact portion 3a on the bottom surface 2c of the case 2; the second fixed terminal 4 provided in the case 2 to expose the contact portion 4a on the side of the case 2 The middle part is formed by the coil spring shape, and the two ends are contacted by the elastic force of the spring in the torsion direction, and the contact piece 5 is in contact with the side surface 2 d in the housing 2; and the contact piece 5 can be pressed from the outside of the housing 2 The operation body 6 is composed. Housing 2, the housing body 2a is made of resin, and at the end of the bottom 2a -9- (6) 1237283, a protrusion 2e for positioning the position of the contact piece 5 is protruded upward, and a cover 2b It is formed of a metal plate. When the cover body 2b covers the opening of the housing body 2a, the cover body 2b is provided at a position on the end side of the housing body 2a which is different from the upper portion of the protrusion 2e, and a hole 2f is formed to penetrate the operating body 6. The first fixed terminal 3 has a flat contact portion 3a at one end and a connection terminal 3b at the other end. The second fixed terminal 4 has a flat contact portion 4a at one end and a connection terminal 4b at the other end. In addition, the first fixed terminal 3 and the second fixed terminal 4 are such that the connection terminals 3b and 4b protrude to the outside of the housing body 2a so that the contact portion 3a is exposed on the bottom surface 2c inside the housing body 2a, and The contact portion 4a is integrally formed with the casing body 2a by insert molding so as to be exposed on the side surface 2d inside the casing body 2a. The contact piece 5 is made of a conductive member, and a coil spring portion 5a having a coil spring shape is formed in the middle portion. As shown in Fig. 8, the coil spring portion 5a is elastic in the winding direction of the coil, and also elastic in the compression direction shown by the arrow C in the drawing. One end of the contact piece 5 extending from the coil spring portion 5a is formed with a fixed contact portion 5b. The fixed contact portion 5b is formed such that one end of the coil spring portion 5a is linear. Furthermore, the other end of the 'contact piece 5 forms a movable contact portion 5c. The movable contact portion 5e is formed as a curved portion 5d and is bent in an L shape, and is further formed from the curved portion 5d into a straight linear portion 5e. The operating body 6 is formed by a -10- (7) 1237283 rod-shaped body that can penetrate through the hole 2f opened in the cover 2b, and is formed so as to be located at the outer end of the housing 2 in a state of passing through the cover 2b. The pressing portion 6a is pressed so that the other end located at the position inside the housing 2 forms an action portion 6b. The pressing portion 6a is a position detection object ', for example, a portion that is pressed by a CD tray or the like. The swing portion 6b 'has a gate-shaped groove 6c formed at the front end. In addition, the operating body 6 is provided so that the action portion 6b is located in the housing 2 and the linear portion 5e at the front end of the movable contact portion 5c is inserted into the gate-shaped groove 6c in a state of being inserted into the cover 2b. . In addition, as shown in the figures, the contact piece 5 has the fixed contact portion 5 b as the bottom surface 2 c side, so that the protrusion 2 e protruding in the housing 2 can be inserted into the hollow portion of the coil spring portion 5 a and brought into fixed contact. The portion 5b and the movable contact portion 5c are inserted into the case body 2a in a compressed state facing the winding direction of the coil spring portion 5a. Therefore, in the contact piece 5, the fixed contact portion 5b is a contact portion 3a of the first fixed terminal 3 provided at the bottom surface 2c in the housing 2, and the movable contact portion 5c is located in the housing 2 The upper position of the contact portion 4a of the second fixed terminal 4 at the side surface 2d. In addition, the operating body 6 is inserted into the hole 2f of the cover body 2b, and the front linear portion 5e of the movable contact portion 5c is inserted into the gate-shaped groove 6c. In this state, the cover body 2b is fixed again so as to close the open side of the case body 2a. Therefore, since the cover body 2b is attached to the housing body 2a in this way, the coil spring is compressed in the compression direction C between the operating body 6 and the bottom surface 2c, so that the fixed contact portion 5b is held by the coil spring portion 5a. The elasticity in the compression direction C maintains the contact state. Furthermore, the movable contact portion 5 c is also located at the upper position of the contact portion 4 a -11-(8) 1237283 provided on the side 2 d, and is covered by the elastic force of the coil spring portion 5 a in the winding direction. Strongly press the contact state on the side 2d. The operation of the first embodiment will be described below. switch! In a state where it is mounted on a circuit board or the like, the pressing part 6a of the operating body 6 is pressed. In this way, the operation body 6 slides into the hole 2f of the cover body 2b. When the operating body 6 slides and moves, the front linear portion 5e of the movable contact portion 5c is inserted into the groove 6c of the operating body 6, so that the coil spring portion 5a of the contact piece 5 is compressed and moved in the direction of the arrow C. Since the point of action on the contact piece 5 is a certain distance from the coil spring portion 5a, the front end straight portion 5e causes the coil spring portion 5a to bend. Then, the curved portion 5d of the movable contact portion 5c is moved while contacting the side surface 2d in the housing body 2a, and soon after it comes into contact with the contact portion 4a of the fixed terminal 4, the contact piece 5 causes the first fixed terminal 3 and the second The fixed terminal 4 is in an electrically conductive state. At this time, the contact pressure between the contact portion 4a of the fixed terminal 4 and the curved portion 5d of the movable contact portion 5c is due to the elastic force of the coil spring portion 5a in the winding direction. The contact pressure change is almost no pressure change and is approximately zero. When the pressing of the pressing portion 6a is released, the operating body 6 returns to the original position by the elastic force in the direction of the arrow C of the spring portion 5a, and the curved portion 5d of the movable contact portion 5c also moves upward in each figure. The contact with the contact portion 4a of the second fixed terminal 4 is released. The operating direction of the switch 1 according to the first embodiment is the winding direction of the coil spring portion 5 a. Below, the operating direction will be described with reference to FIGS. 9 to 14-1237283 〇) The direction can also be with the coil spring portion A second embodiment of the switch 1 in which the winding direction of 5a operates at a right angle. In the switch 1 of the second embodiment, the cover body 2b is not provided, but the operation body 6 is also used as the cover body 2b. That is, the operation body 6 is formed of a plate-like body having a shape substantially the same as that of the opening of the housing body 2a. A pressing portion 6a protruding smoothly and inclining in a mountain shape is formed on the upper end of the operation body 6. Further, on both side portions opposite to the pressing portion 6a of the operation body 6, a center protrusion 6d is provided to allow the side of the pressing portion 6a to swing as a swing center. On the side opposite to the pressing portion 6a of the operating body 6, when the housing body 2a is mounted, the spring portion 5a and the movable contact portion 5c are blocked, so that the opposing surface is formed as the action portion 6b. In addition, the casing body 2a to which the operation body 6 is locked is formed in a substantially box-like shape with one side opening as in the first embodiment. Similarly, the first fixed terminal 3 is formed by providing a contact portion 3a and a connection terminal 3b similarly to the first embodiment, and the second fixed terminal 4 is also provided with a contact portion 4a and a connection terminal 4b. form. In addition, the first fixed terminal 3 and the second fixed terminal 4 are similar to those in the first embodiment. The connection terminal 3b and the connection terminal 4b are protruded to the outside of the case body 2a, and the contact portion 3a is exposed in the case body 2a. The inner bottom surface and the contact portion 4a are exposed to the inner side surface 2d of the case body 2a to be integrally formed with the outer main body 2a by insert molding in a timely manner. In this way, the housing body 2a, which is integrally formed as in the first embodiment, is different from the first embodiment in that the bottom surface 2c is protruded with two protrusions on one side, 2d on the side, and 2g on the upper portion. In the body 6, -13 · (10) 1237283 is formed by inserting a mounting hole 2d through a heart projection 6d. Therefore, the housing body 2a is the same as the first embodiment except that the mounting hole 2h is provided. The contact portion 4a is also formed in the same manner as in the first embodiment, and is provided with a coil spring portion 5a, a fixed contact portion 5b, a movable contact portion 5c, a bent portion 5d, and a tip straight portion 5e. In addition, in the same manner as the first embodiment, the switch 1 of the second embodiment inserts the center protrusion 6d of the operating body 6 into the mounting hole of the housing body 2a with the contact piece 5 provided in the housing body 2a. 2h, the operation body 6 can be swingably mounted on the housing body 2a. In this state, the contact piece 5 is in a stable state without being compressed in the direction of the arrow C, and because the elastic force of the coil spring portion 5 a is in the winding direction, the contact piece 5 is provided in the casing body 2 a in such a deformed state, so that The bent portion 5d provided in the movable contact portion 5c of the contact piece 5 is in a state of being pressed against the side surface 2d of the case body 2a. In addition, the operating body 6 is placed on the coil spring portion 5 a and the movable contact portion 5 c of the contact piece 5 so that the pressing portion 6 a protrudes from the upper portion of the housing body 2 a. In the switch 1 of the second embodiment thus formed, when the pressing portion 6a of the operating body 6 is depressed, the operating body 6 swings toward the bottom surface 2c side of the housing body 2a with the center protrusion 6d as the center. In this way, 'like in the first embodiment, while the movable contact portion 5c of the contact piece 5 moves along the side surface 2d toward the bottom surface 2c side in the housing body 2a, the coil spring portion 5a is slightly compressed on only one side. At the same time, the bent portion 5d of the "soon" movable contact portion 5c that is compressed toward the bottom 2c side comes into contact with the contact portion 4a of the second fixed terminal 4 provided on the side 2d of the housing body 2a -14- (11) 1237283, The contact piece 5 and the first fixed terminal 3 and the second fixed terminal 4 are electrically connected. When the pressing of the pressing portion 6a is released, the operating body 6 returns to the original position by the elastic force of the spring portion 5a acting in the direction of the arrow C, and the curved portion 5d of the movable contact portion 5c also moves upward in each figure. The contact with the contact portion 4a of the second fixed terminal 4 is released. Therefore, in the second embodiment, the operating body 6 is made to swing freely, and the coil spring portion 5 a and the movable contact portion 5 (: are compressed and moved due to the action portion 6 b. The operation of the switch 1 may be performed from the switch. The direction above 1 is toward the bottom surface 2c, that is, the compression force of the coil spring portion 5a in the compression direction, or the direction parallel to the upper surface of the switch 1, that is, the inclined portion of the pressing portion 6a of the operating body 6 It is also possible to press the pressing force in the horizontal direction. If it is operated by the pressing force parallel to the upper direction of the switch 1, a part of the pressing force on the inclined surface of the pressing portion 6a is pressed. It is converted into a swinging force that swings the operating body 6 toward the bottom surface 2c side, and becomes a pressing force that compresses the coil spring portion 5a in the compression direction. Also, in the second embodiment, the operating body 6 is not The contact piece 5 is mounted in a compressed state toward the bottom surface 2c of the housing body 2a. However, when the operating body 6 is mounted on the housing body 2a, the operating body 6 on the side of the action portion 6b and the upper portion of the housing body a may be restricted. Acting part 6b faces outward The locking recessed portion and the locking protruding portion ′ that slide above the main body 2a can be used to attach the operating body 6 to the housing main body 2a while the coil spring portion 5a of the contact piece 5 is compressed toward the bottom surface 2c. (12) 1237283 [Industrial Applicability] According to the present invention, since the switch is formed in the above-mentioned manner, the coil spring portion is hardly deformed in the winding direction during operation, so that the contact pressure of the contact piece after contacting the fixed terminal does not exist. The amount of change in the movement of the operating body is approximately constant. Therefore, the contact pressure at the contact start position where the contact piece is in a conductive state with the fixed terminal does not occur, which is different from the contact pressure when the contact piece moves more after contact. Misjudging the conduction state causes positional errors, so the accuracy of the position on the detection side can be improved. Also, because the contact piece can be operated without changing the diameter direction of the coil, the coil diameter direction and contact of the coil spring portion can be made. The direction of the switch operation of the film is to set the contact plate in a different direction, so the length of the direction of the switch operation can be reduced. [Brief Description of the Drawings] Fig. 1 is a plan explanatory view showing a first embodiment of the present invention. Fig. 2 is a front explanatory view of the same invention. Fig. 3 is a right side explanatory view of the same invention. Fig. 4 It is a cross-sectional explanatory view of the line A-A in Fig. 1. Fig. 5 is a cross-sectional explanatory view of the line B-B in Fig. 1. Fig. 6 is a one-body illustration in a state where a part of the first embodiment is removed. Fig. 7 is a plan explanatory view of Fig. 6. Fig. 8 is a perspective explanatory view showing a part of the first embodiment. Fig. 9 is a perspective explanatory view of a second embodiment of the present invention. -16- (13) 1237283 Fig. 10 is a front explanatory diagram of Fig. 9. Fig. 11 is a plan explanatory diagram of Fig. 9. Fig. 12 is a right-side explanatory diagram of Fig. 9 and Fig. 13 is Fig. 11 is a cross-sectional explanatory view taken along line D-D in Fig. 11 Fig. 14 is a cross-sectional explanatory view taken along line E-E in Fig. 10 and Fig. 15 is an explanatory view of the prior art. Main component symbol comparison table 1: switch 2: housing 2a: housing body 2b: cover 2c: bottom surface of the housing 2d, 2g: side surface inside the housing 2e: protrusion 2f: hole 2h: mounting hole 3: first fixing Terminal 3 a: contact part 3 b: connection terminal 4: second fixed terminal 4 a: contact part 4 b: connection terminal 5: contact piece-17- 1237283 (14) 5 a: coil spring part 5 b · fixed contact part 5 c: movable contact part 5 d: curved part 5 e: front end straight part 6: operating body 6 a. pressing part 6b: action part 6 c · groove 6 d · central protrusion 1 1 1: housing 111a: depression 1 1 2, 1 1 3: Fixed terminal 1 1 4: Contact piece 1 14b: Movable end 1 14e: Spring part (coil part) 1 1 4 c, 11 4 d: Contact part 1 1 5: Operating body 115a: Groove 1 1 6: Case cover
116a：孑L 1 1 6 b :突部116a: 孑 L 1 1 6 b: protrusion