貼(tie)片輕(qing)觸(chu)開關的結構及原(yuan)理
貼片輕觸開關是(shi)一(yi)種(zhong)比較(jiao)常見的電(dian)子開關(guan)(guan)。它的主(zhu)要特(te)點是(shi)經(jing)過再流(liu)焊(han)接(jie)后，能(neng)進(jin)行清(qing)洗，并在(zai)接(jie)觸(chu)轉(zhuan)換結構上(shang)配(pei)置了(le)各(ge)種(zhong)形狀的輕(qing)觸(chu)按(an)鍵(jian)。由于貼片輕(qing)觸(chu)開關(guan)(guan)的接(jie)觸(chu)電(dian)阻小(xiao)、按(an)動有清(qing)脆的聲音，且(qie)手(shou)感舒適、規格齊全等方(fang)面的原因(yin)，因(yin)此其在(zai)家用(yong)電(dian)器方(fang)面被廣(guang)泛(fan)應用(yong)。
貼(tie)片輕(qing)觸(chu)開(kai)關的底座(zuo)一般是用高耐(nai)熱性(xing)(xing)樹脂制作而成(cheng)，并在(zai)底座(zuo)上嵌入了一對固定(ding)接(jie)觸(chu)片（接(jie)觸(chu)片1和2）。考慮到開(kai)關在(zai)焊(han)接(jie)時的密封性(xing)(xing)，常使用與金屬粘(zhan)接(jie)性(xing)(xing)良好的粘(zhan)接(jie)劑(ji)(ji)涂(tu)敷于固定(ding)接(jie)觸(chu)片和底座(zuo)組裝處的相對面(mian)上，以防(fang)止焊(han)劑(ji)(ji)侵入貼(tie)片輕(qing)觸(chu)開(kai)關內部，造成(cheng)開(kai)關出現質量(liang)問題(ti)。有(you)時也會使用表面(mian)活性(xing)(xing)劑(ji)(ji)來進行密封。
貼片輕觸開關的原理：在底座的中心裝上了已成形的(de)(de)(de)可(ke)動接(jie)(jie)觸(chu)(chu)(chu)(chu)簧片(pian)(pian)(pian)(pian)(pian)，簧片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)凸緣邊與(yu)底座內(nei)的(de)(de)(de)固(gu)定觸(chu)(chu)(chu)(chu)片(pian)(pian)(pian)(pian)(pian)1保(bao)持連接(jie)(jie)狀(zhuang)態，這樣的(de)(de)(de)話，作(zuo)(zuo)(zuo)用(yong)(yong)(yong)于按(an)(an)(an)鍵(jian)(jian)板2及按(an)(an)(an)鍵(jian)(jian)板1的(de)(de)(de)壓力(li)(li)就會使(shi)可(ke)動接(jie)(jie)觸(chu)(chu)(chu)(chu)簧片(pian)(pian)(pian)(pian)(pian)與(yu)固(gu)定觸(chu)(chu)(chu)(chu)片(pian)(pian)(pian)(pian)(pian)2導通。由于反作(zuo)(zuo)(zuo)用(yong)(yong)(yong)力(li)(li)的(de)(de)(de)影響，在取消壓力(li)(li)后可(ke)動簧片(pian)(pian)(pian)(pian)(pian)便恢復原位(wei)，即可(ke)完成開(kai)/關(guan)(guan)作(zuo)(zuo)(zuo)用(yong)(yong)(yong)。在這里，貼片(pian)(pian)(pian)(pian)(pian)輕觸(chu)(chu)(chu)(chu)開(kai)關(guan)(guan)按(an)(an)(an)鍵(jian)(jian)板1的(de)(de)(de)作(zuo)(zuo)(zuo)用(yong)(yong)(yong)主要(yao)是(shi)將外力(li)(li)傳遞給可(ke)動簧片(pian)(pian)(pian)(pian)(pian)，使(shi)可(ke)動簧片(pian)(pian)(pian)(pian)(pian)正確工作(zuo)(zuo)(zuo)；按(an)(an)(an)鍵(jian)(jian)板２的(de)(de)(de)作(zuo)(zuo)(zuo)用(yong)(yong)(yong)是(shi)把力(li)(li)傳遞給固(gu)定觸(chu)(chu)(chu)(chu)片(pian)(pian)(pian)(pian)(pian)1，以(yi)完成接(jie)(jie)觸(chu)(chu)(chu)(chu)轉(zhuan)換動作(zuo)(zuo)(zuo)，按(an)(an)(an)鍵(jian)(jian)板1與(yu)2之間的(de)(de)(de)薄(bo)片(pian)(pian)(pian)(pian)(pian)主要(yao)起(qi)到(dao)密(mi)封作(zuo)(zuo)(zuo)用(yong)(yong)(yong)。當然，所有的(de)(de)(de)部件都會被封裝(zhuang)起(qi)來(lai)，避免灰塵等(deng)雜(za)質影響開(kai)關(guan)(guan)的(de)(de)(de)性能。
