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(ta)一直遲至19世紀末期才(cai)被(bei)發明(ming),因(yin)為(wei)它(ta)必(bi)須結合電(dian)池(chi)與電(dian)燈泡的(de)發明(ming)。在(zai)早期因(yin)為(wei)電(dian)池(chi)的(de)蓄電(dian)力不足,因(yin)此(ci)在(zai)英文(wen)中它(ta)被(bei)稱為(wei)"Flashlight",意即短暫的(de)燈。
雖然說現(xian)在手(shou)機都有(you)(you)自帶手(shou)電(dian)筒(tong)的功能,但是,夜晚,家里(li)停電(dian)了(le)或者出行時,手(shou)機也沒電(dian),手(shou)電(dian)筒(tong)可(ke)派上(shang)大用場了(le)。隨(sui)著手(shou)電(dian)筒(tong)技(ji)術的發(fa)展,家用手(shou)電(dian)有(you)(you)壽命長、可靠(kao)耐用(yong)、維護(hu)費用(yong)極為低的(de)特點。采用(yong)恒壓驅動(dong)(dong)保證強光手(shou)(shou)電(dian)(dian)(dian)筒(tong)亮(liang)度的(de)一致(zhi)性,保證LED手(shou)(shou)電(dian)(dian)(dian)筒(tong)的(de)可靠(kao)性、壽命(ming)和(he)光衰。采用(yong)低成本、高可靠(kao)性的(de)驅動(dong)(dong)電(dian)(dian)(dian)路才(cai)是保證超手(shou)(shou)電(dian)(dian)(dian)筒(tong)有持久亮(liang)度的(de)關鍵,所以我們在選購家用(yong)手(shou)(shou)電(dian)(dian)(dian)筒(tong)也需要格外細(xi)心(xin)。