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Barcode scanner internal structure and working principle

time2010/07/02

Common bar code scanners generally flat light source, optical lens, scanning module, analog-digital conversion circuitry plus plastic composition. It uses optical devices to detect the optical signals into electrical signals, then signals through the analog-digital converter into a digital signal transmitted to the computer processing. When scanning an image when the light source to the image after the convergence of the reflected light through the lens to the scanning module, the scanning module converts analog signals to digital optical signal (ie voltage, it receives the light intensity related), also pointed out that as the number of gray levels. At this time analog - digital converter circuit to convert analog voltage into digital signals, transmitted to the computer. Color with RGB three colors 8,10,12 bits to quantify, both the signal processing into the median of the image output. If you have quantified higher median means that images can have a more extensive level and depth, but the color range beyond the human eye recognition, it can be resolved in the context for us, Genggao digits of bar code scanning scanned color convergence out effect is smooth and the picture to see more details.