手電筒:(英文:Flashlight或Torch),簡稱電筒,是一種手持式電子照明工具。一個典型的手電筒有一個經由電池供電的燈泡和聚焦反射鏡,并有供手持用的手把式外殼。雖然是相當簡單的設計,它一直(zhi)遲至19世紀末期(qi)才被發明,因為它必須結合(he)電(dian)(dian)池與電(dian)(dian)燈(deng)泡的發明。在(zai)早期(qi)因為電(dian)(dian)池的蓄電(dian)(dian)力不足,因此在(zai)英(ying)文(wen)中它被稱為"Flashlight",意即短暫(zan)的燈(deng)。
雖然(ran)說現在手(shou)(shou)機都(dou)有自帶手(shou)(shou)電(dian)(dian)筒的(de)功能,但是(shi),夜(ye)晚,家(jia)(jia)里(li)停電(dian)(dian)了或者出行時,手(shou)(shou)機也沒電(dian)(dian),手(shou)(shou)電(dian)(dian)筒可派(pai)上大用場了。隨著手(shou)(shou)電(dian)(dian)筒技術的(de)發展,家(jia)(jia)用手(shou)(shou)電(dian)(dian)有壽命長(chang)、可(ke)靠(kao)耐用(yong)(yong)、維護費(fei)用(yong)(yong)極為低(di)的(de)(de)特點。采用(yong)(yong)恒(heng)壓(ya)驅動保證強(qiang)光手(shou)電筒(tong)亮(liang)度(du)的(de)(de)一致性,保證LED手(shou)電筒(tong)的(de)(de)可(ke)靠(kao)性、壽(shou)命和光衰(shuai)。采用(yong)(yong)低(di)成本、高(gao)可(ke)靠(kao)性的(de)(de)驅動電路才是(shi)保證超手(shou)電筒(tong)有持久(jiu)亮(liang)度(du)的(de)(de)關(guan)鍵,所以(yi)我(wo)們在選購家(jia)用(yong)(yong)手(shou)電筒(tong)也(ye)需要格外細(xi)心。