专利名称：Bar code readers having selectable optical
elements
发明人：Joseph Campanelli,Paul Dvorkis,Boris
Metlitsky,Daniel R. McGlynn
申请号：US08/999956申请日：19970917公开号：US06024283A公开日：20000215
摘要：A bar code reader for reading a symbol located at a distance from the lasercomprises an array of groups of reading elements and an array of selectable liquidcrystal elements. Each of the groups of reading elements have an associated
predetermined operating focal distance. At least one liquid crystal element correspondsto each group of reading elements. In the bar code reader, a device activates a selectedliquid crystal element to transmit light to a selected group of reading elements. In thisway, the reading elements can operate at a predetermined, fixed operating focaldistance.
申请人：SYMBOL TECHNOLOGIES, INC.
代理机构：Finnegan, Henderson, Farabow, Garrett & Dunner, LP.
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