后視鏡是駕駛員坐在駕駛室座位上直接獲取汽車后方、側方和下方等外部信息的工具。為了駕駛員操作方便,防止行車安全事故的發生,保障人身安全,各國均規定了汽車上必須安裝后視鏡,且所有后視鏡都必須能調整方向。
在夜間受到后車的前照燈照射時,后視鏡的反射光進入駕駛員的眼簾,易于造成炫目狀態,所以開發出防炫目內后視鏡。防炫目內后視鏡大致可以分為兩種:
(1)成本低且成為主流的截面為楔型的內后視鏡;
(2)從功能效用的觀點出發,僅在必要的景物時使用的采用了電控彩色發光元件或液晶元件的內后視鏡。
防眩目電(dian)(dian)(dian)(dian)動(dong)后(hou)(hou)(hou)視(shi)鏡由(you)1個(ge)(ge)特(te)殊的(de)電(dian)(dian)(dian)(dian)化層(ceng)(ceng)(ceng)鏡面(mian)、2個(ge)(ge)光(guang)電(dian)(dian)(dian)(dian)傳感器(qi)以及電(dian)(dian)(dian)(dian)子(zi)(zi)控制器(qi)組成(cheng)。電(dian)(dian)(dian)(dian)子(zi)(zi)控制器(qi)接收光(guang)敏(min)二極管傳送(song)的(de)燈(deng)光(guang)照射強度信號,如果(guo)后(hou)(hou)(hou)車燈(deng)光(guang)強于前車燈(deng)光(guang),電(dian)(dian)(dian)(dian)子(zi)(zi)控制器(qi)將輸出一個(ge)(ge)電(dian)(dian)(dian)(dian)壓到(dao)鏡面(mian),改(gai)(gai)變(bian)鏡面(mian)電(dian)(dian)(dian)(dian)化層(ceng)(ceng)(ceng)的(de)顏色。這(zhe)個(ge)(ge)電(dian)(dian)(dian)(dian)壓越(yue)高,電(dian)(dian)(dian)(dian)化層(ceng)(ceng)(ceng)顏色的(de)改(gai)(gai)變(bian)越(yue)大。電(dian)(dian)(dian)(dian)化層(ceng)(ceng)(ceng)的(de)顏色改(gai)(gai)變(bian)后(hou)(hou)(hou),經過電(dian)(dian)(dian)(dian)動(dong)后(hou)(hou)(hou)視(shi)鏡反射到(dao)駕(jia)駛員眼睛的(de)光(guang)線(xian)就顯著(zhu)減弱,不(bu)但(dan)不(bu)影響駕(jia)駛員的(de)視(shi)力,反而提高了(le)駕(jia)乘車輛的(de)舒適性和安全性。
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