The internal structure and working principle of scanner

- Jun 01, 2018-

The internal structure and working principle of scanner


Common flat-panel scanners generally consist of a light source, an optical lens, a scanning module, an analog-to-digital conversion circuit, and a plastic housing.


It uses photoelectric elements to convert the detected optical signal into an electrical signal. The electrical signal is then converted into a digital signal by an analog-to-digital converter and transmitted to a computer for processing. When scanning an image, the light source illuminates the image and the reflected light converges on the scanning module through the lens. The scanning module converts the light signal into an analog digital signal (ie voltage, the intensity of the received light). Relevant), while indicating the degree of darkness of that image. At this point, the analog-to-digital conversion circuit converts the analog voltage into a digital signal and transmits it to the computer.


The color is quantized with 8, 10, and 12 bits of RGB three colors, that is, the signal is processed into the above-mentioned bit number of image output. If there is a higher number of digits of quantization, it means that the image can have a richer level and depth, but the color range has exceeded the recognition ability of the human eye, so in the distinguishable range, for us, the effect of the scan by a higher-digit scanner is smooth color convergence, to see more details of the picture.

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