1. Signals are received by light emission and then reflection. Barcodes generally respond to the same information.

2. The supermarket code scanner is actually a converter that converts bar codes into numbers. This kind of equipment is basically divided into two types, scanning gun and scanning platform. Their function is very simple, and bar code graphics are converted into digital signals through infrared detection. So as to be called by cash register equipment or background management equipment.

3. The cashier connected to the POS machine is a code scanning gun, which has no storage function. After scanning, it transmits the data to the computer for storage. The inventory is called an inventory machine or a data collector. It is a computer, and its principle is the same as that of a mobile phone. It has a CPU, memory, FLASH, and a memory card, which is related to the program. Just like a computer opening a web page or program, it can upload the data directly to the server or it can be inserted.

4. It uses photoelectric elements to convert the detected optical signals into electrical signals, and then converts the electrical signals into digital signals through analog-to-digital converters and transmits them to the computer for processing.

5. When scanning an image, the reflected light from the light source shines on the image and converges on the scanning module through the lens. The scanning module converts the optical signal into an analog digital signal, and points out the gray degree of that image.

6. At this time, the analog-digital conversion circuit converts the analog voltage into a digital signal and sends it to the computer. The color is quantized by 8, 11 and 12 bits of RGB, which not only processes the signal into the above-mentioned digital images for output. If there are higher quantization digits, it means that the image can have richer levels and depths, but the color range is beyond the human eye's recognition ability. Therefore, for us, the effect of barcode scanner scanning with higher digits is smooth color connection and more picture details can be seen.

Extended information

(1) The scanning window light-transmitting mirror is made of special toughened material, which is more resistant to breakage, more smooth in light transmittance and further in depth of field;

(2) The plastic of gun body conforms to the national standard manufacturing process, so that it has no odor, high temperature resistance, corrosion resistance, easy scrubbing, and the gun thread can be removed with a pin, which is very convenient to operate;

(3) The ergonomic design is perfectly embodied, the buzzing sound is louder (or smaller), the shock absorption is reasonably equipped from beginning to end, and it can withstand repeated ground tests of falling 2 meters.

Reference: Baidu Encyclopedia: barcode scanner.