聲學(xué)脈沖波辨識(shí)觸控技術(shù)(簡(jiǎn)稱APR)是一個(gè)全新并且獨(dú)特的感覺觸控技術(shù)。APR觸控技術(shù)綜合了超音波觸控技術(shù)(SAW)及紅外線觸控技術(shù)(IR)良好的光學(xué)性能及優(yōu)秀的耐久性和穩(wěn)定性的優(yōu)點(diǎn);還有電容觸控技術(shù)(Capacity)優(yōu)秀的拖曳及可用觸控筆、手套、指甲觸控的優(yōu)點(diǎn);而且還有電阻式技術(shù)價(jià)格便宜的優(yōu)點(diǎn);另外,APR對(duì)水和其他污染物是有很好的抵御性,它還可被分成不同尺寸的觸摸屏,從適合PDA使用的小尺寸觸摸屏到42英寸顯示器用的大尺寸觸摸屏,并在簽署字的應(yīng)用時(shí)可很好地排除手掌導(dǎo)致的誤觸控問題。
和與許多在歷史上的發(fā)明相比,APR是以一種簡(jiǎn)單和典雅的聲音辨識(shí)方式來測(cè)量玻璃上被接觸的點(diǎn)的位置。其關(guān)鍵是在玻璃上每個(gè)位置接觸時(shí)都會(huì)產(chǎn)生獨(dú)特的聲音。四個(gè)附在觸摸屏邊緣玻璃的微小收發(fā)器接收到接觸的聲音,這個(gè)聲音由控制器數(shù)字化,然后與事先所記錄下的玻璃上每個(gè)位置聲音的列表相比較,光標(biāo)位置立即被更新到觸摸位置。APR的設(shè)計(jì)可忽略外來和四周噪聲,因?yàn)樗鼈兣c事先記錄的錄音記不吻合。
APR與其他試圖以收發(fā)器或麥克風(fēng)來識(shí)別觸摸位置的技術(shù)不同,它使用一個(gè)簡(jiǎn)單聲音表查尋方式更勝于那種沒有任何參考而且需要強(qiáng)有力又昂貴的信號(hào)處理硬件來試圖計(jì)算觸摸位置的方式。APR沒有尺寸限制的觸控技術(shù)。易觸控的在35年前發(fā)明了觸摸屏-電阻式觸控技術(shù)。到今天為止,電阻式依舊仍然是全世界應(yīng)用最普遍的觸控技術(shù),可從PDA到工業(yè)控制設(shè)備到餐館用的餐飲收銀(POS)終端機(jī)。目前世界上觸摸顯示器供應(yīng)商可提供所有主要觸控的技術(shù)包括電阻、電容、紅外、和聲波。每個(gè)技術(shù)都適合特定的應(yīng)用和環(huán)境。雖然APR是一個(gè)新技術(shù),它與易觸控應(yīng)用了20年的聲波技術(shù)在某一些方面是非常相似的。兩個(gè)都是聲原理,并使用一塊純凈的玻璃與附在其上的信號(hào)收發(fā)器。但是聲波的信號(hào)收發(fā)器是發(fā)出并且接收信號(hào)的,但APR只是用它來接收信號(hào)的。
APR的動(dòng)作原理
APR的組成包括玻璃或其他堅(jiān)硬的材質(zhì),與組裝在背面四個(gè)信號(hào)接收器。信號(hào)接收器被鑲嵌在可見區(qū)域的對(duì)角反面角落上,并且跟通過電纜連接到控制卡。當(dāng)屏幕被觸摸時(shí)產(chǎn)生碰撞或使用者用手指或觸控筆在玻璃上扯拽時(shí)產(chǎn)生聲波,聲波從接觸點(diǎn)四射到信號(hào)接收器,使其產(chǎn)生成比例的電子信號(hào)。這些信號(hào)在控制卡被放大,然后被轉(zhuǎn)換成一條數(shù)字信息。這些數(shù)字信息與之前存放在數(shù)據(jù)庫(kù)的做比較來判斷觸摸的位置。APR觸控技術(shù)有防止四周和環(huán)境噪聲的設(shè)計(jì),原理是因?yàn)檫@些與之前存放的信息不相匹配。
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