Importance

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Abstract

A method of operating an indicia reader comprising the steps of: transmitting light partly through a window toward a target; receiving reflected light from a target and the window onto a photodetector; converting the received light into photodetector output signals representative thereof with the photodetector; storing a baseline photodetector photodetector output signal derived solely from light reflected from the window; decoding indicia information within the target containing information bearing indicia derived from the photodetector output signals; comparing photodetector output signals with the baseline photodetector output signal; and, notifying an operator with an audible or visual signal when the comparison indicates the window is contaminated.

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First Claim