Patent ID: 6616046
Filing Date: 2003-09-09
Classification: G06K

Abstract:
In a reader for electro-optically reading a bar code symbol, the symbol comprising bars and spaces of different light reflectivity and having specific relative widths, by sweeping a laser spot across the symbol for reflection therefrom, by detecting laser light reflected from the symbol, and by generating an analog electrical signal indicative of the laser light detected, an arrangement for reducing speckle noise influence in the analog signal, the arrangement comprising:a) a laser emitter for emitting a laser beam to form the laser spot on the symbol with a circular spot size having a diameter at least twice a width of a bar having the narrowest width in the symbol; and b) a decoder including a non-differentiating digitizer for processing the analog signal into an output signal having transitions which correspond to boundaries between adjoining bars and spaces.