The internal structure and working principle of bar code scanner

- Aug 17, 2018-

The common flat-panel bar code scanner consists of light source, optical lens, scanning module, analog-digital conversion circuit and plastic shell. It uses optoelectronic components to convert the detected optical signals into electrical signals, and then the electrical signals are converted into digital signals by analog-to-digital converters and transmitted to the computer for processing.

When an image is scanned, the reflected light from the light source shining on the image converges through the lens to the scanning module, which converts the light signal into an analog digital signal (i.e. voltage, which is related to the intensity of the received light), and indicates the grey degree of that image. At this time, analog to digital conversion circuit converts analog voltage to digital signal and sends it to the computer.

The color is quantized by 8, 10 and 12 bits of RGB tricolor, and the signal is processed into the image output of the above digit. If there are higher quantization bits, it means that the image can have a richer level and depth, but the color range is beyond the recognition ability of the human eye, so for us in the range of resolution, the effect of higher digit bar code scanner is that the color cohesion is smooth, can see more details of the picture.