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Adaptive focusing using liquid crystal zone plates in electro-optical readers
Adaptive focusing using liquid crystal zone plates in electro-optical readers
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机译:在电光阅读器中使用液晶分区板进行自适应聚焦
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摘要
Working range and beam cross-section are adjusted in an electro-optical reader for reading indicia by applying voltages to electrodes in one or more liquid crystal zone plates in which the index of refraction is changed in different regions of each zone plate.
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