Barcode scanner, also known as barcode reader, barcode scanning gun, barcode scanner, barcode scanning gun and barcode reader. It is used to read the information contained in the barcode reading device, using optical principle, the barcode content decoded by the data line or wireless transmission to the computer or other devices. Widely used in supermarkets, logistics express delivery, library and other scanning commodities, receipts barcode.

Barcode scanner can be divided into one-dimensional, two-dimensional barcode scanner. The structure of barcode scanner is usually divided into the following parts: light source, receiving device, photoelectric conversion unit, decoding circuit, computer interface. The basic working principle of the scanning gun is: the light emitted by the light source passes through the optical system to illuminate the barcode symbol. The reflected light is imitated by an optical system. On the photoelectric converter, it is interpreted by the decoder as a digital signal directly accepted by the computer. In addition to a two-dimensional barcode scanner classification. Also classified as: CCD, full Angle laser and laser handheld barcode scanner.