Classification of barcode reading devices
Bar code reader is used to read the information contained in the bar code, bar code reader structure is usually the following parts: light source, receiving device, photoelectric conversion component, decoding circuit, computer interface.
Their basic working principle is as follows: By light irradiation light through the optical system to the bar code above, be reflected light through the optical system imaging on the photoelectric converter, to generate electrical signals, the analog voltage signal after amplification circuit, it reflected back and irradiation on the bar code symbol is proportional to the light, after filtering, plastic, formation and the corresponding square wave signal analog information, A digital signal that is interpreted by a decoder to be accepted directly by a computer. Various types of barcode reading devices have been designed and made according to different needs and uses.
There are several types of barcode reading devices:
1) Classify by scanning mode
From the scanning mode can be divided into contact and non-contact bar code reader.
2) Classification from operation mode
From the bar code operation mode can be divided into hand-held and fixed bar code reader.
3) According to the ability to read the code system to classify
From the ability of reading code system can be divided into light pen, CCD, laser and shooting bar code reader. Light pen and slot bar code scanner can only read one-dimensional bar code. Laser scanners can read only one - dimensional and two - dimensional bar codes. Image scanner can read one-dimensional bar code and row, matrix two-dimensional bar code.
4) Classification from scanning direction
From the scanning direction can be divided into unidirectional and omnidirectional barcode scanner.
In recent years, bar code scanning reading equipment has developed rapidly, and is developing towards multi-function, long-distance, miniaturization, rapid identification, economic and convenient direction.