The basic working principle of barcode scanner

The basic working principle of barcode scanner

According to the customary name, different barcode scanners are also known as barcode readers, barcode scanners, barcode scanners, barcode scanners and barcode scanners.

Barcode scanners use photoelectric principles to convert bar code information into computer-acceptable input devices. They are commonly used in libraries, hospitals, bookstores, and supermarkets as an input means for quick registration or settlement, on goods packaging or printed matter. The bar code information on it is read directly and entered into the online system.

1. Barcode scanner is a device for reading the information contained in the bar code. The structure of the bar code scanner is usually the following parts: light source, receiving device, photoelectric conversion component, decoding circuit, computer interface.

2. The basic working principle of the barcode scanner is:

The light emitted by the light source is irradiated onto the bar code symbol through the optical system, and the reflected light is imaged on the photoelectric converter through the optical system to generate an electrical signal, and the signal is amplified by the circuit to generate an analog voltage, which is irradiated to the bar code. The light reflected back on the symbol is proportional, and then filtered and shaped to form a square wave signal corresponding to the analog signal, which is interpreted by the decoder as a digital signal that can be directly accepted by the computer.

3. Ordinary barcode scanners usually use the following three technologies: light pens, CCDs, and lasers all have their own advantages and disadvantages. No scanner can have advantages in all aspects.