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二手貼片機防靜電知識

文章(zhang)出處: 人氣:48發表(biao)時間(jian):2020-5-13 14:46:15

在(zai)電子產品制造中(zhong),靜(jing)電放電往往會損傷器件,甚至使(shi)器件失效,造成嚴(yan)重損失,因(yin)此二手貼(tie)片機(ji)生產中(zhong)的靜(jing)電防護非常重要。帶您了解二手貼(tie)片機(ji)防靜(jing)電的相關知識。

一、靜電和靜電的(de)危害

靜(jing)電(dian)(dian)是(shi)(shi)一種電(dian)(dian)能,它(ta)存(cun)留于物體表面,是(shi)(shi)正負電(dian)(dian)荷(he)在局部范圍內失去平衡(heng)的(de)結果,通過(guo)電(dian)(dian)子或離子的(de)轉換而(er)形成的(de)。靜(jing)電(dian)(dian)現象(xiang)(xiang)是(shi)(shi)電(dian)(dian)荷(he)在產生和消失過(guo)程中(zhong)產生的(de)電(dian)(dian)現象(xiang)(xiang)的(de)總稱。如(ru)摩擦起電(dian)(dian)、人體起電(dian)(dian)等現象(xiang)(xiang)。  

隨著科技發展,靜(jing)電(dian)(dian)(dian)現象已(yi)在(zai)靜(jing)電(dian)(dian)(dian)噴涂、靜(jing)電(dian)(dian)(dian)紡織、靜(jing)電(dian)(dian)(dian)分選、靜(jing)電(dian)(dian)(dian)成像等領域(yu)得到廣泛的(de)(de)(de)(de)有效應(ying)用。但在(zai)另一方面,靜(jing)電(dian)(dian)(dian)的(de)(de)(de)(de)產(chan)(chan)生(sheng)(sheng)在(zai)許多領域(yu)會帶來(lai)重大危害(hai)和損(sun) 失(shi)。在(zai)電(dian)(dian)(dian)子工業中,隨著集(ji)成度越(yue)(yue)來(lai)越(yue)(yue)高,集(ji)成電(dian)(dian)(dian)路的(de)(de)(de)(de)內絕緣層(ceng)越(yue)(yue)來(lai)越(yue)(yue)薄,互連導線(xian)寬度與間距(ju)越(yue)(yue)來(lai)越(yue)(yue)小(xiao),例如CMOS器(qi)件(jian)(jian)絕緣層(ceng)的(de)(de)(de)(de)典型(xing)厚(hou)度約為0.1μm,其(qi) 相應(ying)耐擊穿(chuan)電(dian)(dian)(dian)壓在(zai)80-100V;VMOS器(qi)件(jian)(jian)的(de)(de)(de)(de)絕緣層(ceng)更薄,擊穿(chuan)電(dian)(dian)(dian)壓在(zai)30V。而在(zai)電(dian)(dian)(dian)子產(chan)(chan)品(pin)制造中以及運(yun)輸、存儲等過(guo)程中所產(chan)(chan)生(sheng)(sheng)的(de)(de)(de)(de)靜(jing)電(dian)(dian)(dian)電(dian)(dian)(dian)壓遠遠超過(guo) MOS器(qi)件(jian)(jian)的(de)(de)(de)(de)擊穿(chuan)電(dian)(dian)(dian)壓,往往會使器(qi)件(jian)(jian)產(chan)(chan)生(sheng)(sheng)硬擊穿(chuan)或軟擊穿(chuan)(器(qi)件(jian)(jian)局部損(sun)傷)現象,使其(qi)失(shi)效或嚴重影響產(chan)(chan)品(pin)的(de)(de)(de)(de)可(ke)靠性(xing)。  

二、靜電敏感器件

對靜(jing)電(dian)反應敏感的(de)(de)器(qi)(qi)件(jian)(jian)稱為靜(jing)電(dian)敏感元(yuan)器(qi)(qi)件(jian)(jian)(SSD)。靜(jing)電(dian)敏感器(qi)(qi)件(jian)(jian)主要(yao)是指超大規模集成(cheng)電(dian)路,特別是金屬化膜半導體(MOS電(dian)路)。可根據SSD分(fen)級表,針對不(bu)同(tong)的(de)(de)SSD器(qi)(qi)件(jian)(jian),采取不(bu)同(tong)的(de)(de)靜(jing)電(dian)防護措(cuo)施。

三、電(dian)(dian)子產品制造中的靜電(dian)(dian)源  

1.人(ren)(ren)(ren)體(ti)(ti)(ti)的(de)(de)(de)活(huo)動(dong)(dong),人(ren)(ren)(ren)與衣服、鞋、襪等物體(ti)(ti)(ti)之(zhi)間的(de)(de)(de)摩擦、接(jie)觸和分離等產(chan)(chan)生的(de)(de)(de)靜(jing)電(dian)是(shi)電(dian)子產(chan)(chan)品制造(zao)中主(zhu)要靜(jing)電(dian)源(yuan)之(zhi)一。人(ren)(ren)(ren)體(ti)(ti)(ti)靜(jing)電(dian)是(shi)導致器件產(chan)(chan)生硬擊(ji)(ji)穿的(de)(de)(de)主(zhu)要原因。人(ren)(ren)(ren)體(ti)(ti)(ti)活(huo)動(dong)(dong)產(chan)(chan)生的(de)(de)(de)靜(jing)電(dian)電(dian)壓約0.5-2KV。另外(wai)空(kong)氣濕(shi)度(du)(du)對(dui)(dui)靜(jing)電(dian)電(dian)壓影響很大(da),若(ruo)在干(gan)燥環境中還要上升1個數量(liang)級。相對(dui)(dui)濕(shi)度(du)(du)對(dui)(dui)與人(ren)(ren)(ren)體(ti)(ti)(ti)活(huo)動(dong)(dong)帶(dai)(dai) 電(dian)的(de)(de)(de)關系(xi),人(ren)(ren)(ren)體(ti)(ti)(ti)帶(dai)(dai)電(dian)后(hou)觸摸到地(di)線,會(hui)產(chan)(chan)生放電(dian)現象,人(ren)(ren)(ren)體(ti)(ti)(ti)就會(hui)產(chan)(chan)生不同程度(du)(du)的(de)(de)(de)電(dian)擊(ji)(ji)感反應(ying),其反應(ying)的(de)(de)(de)程度(du)(du)稱為電(dian)擊(ji)(ji)感度(du)(du)。

2.化(hua)纖(xian)或(huo)棉制工作(zuo)服與工作(zuo)臺面、坐椅摩(mo)擦時,可在(zai)服裝表(biao)面產生6000V以(yi)上(shang)的靜電電壓,并使人體帶電,此(ci)時與器(qi)件接觸時,會導致放電,容易損(sun)壞(huai)器(qi)件。

3.橡膠或(huo)塑料鞋底的(de)絕緣電(dian)阻高達1013Ω,當與(yu)地面摩(mo)擦時(shi)產生靜(jing)電(dian),并使人體帶電(dian)。