Which semiconductor device is used in bar code reader?

A barcode reader uses different types of technologies to differentiate the process of scanning in the various types of optical scanners Pen type barcode reader

READER SERVICE CARD Labeling Software For Dot Matrix or LaserJet Bar Code Readers for PC, XT, AT, PS2, Mac and RS-232 Tenninals Portable Bar Code Readers

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which technology is particularly used in barcode wand reader and barcode slot reader This device gener- ates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause