Principle of Laser Barcode Scanning Gun

- Jul 24, 2020-

Principle of Laser Barcode Scanning Gun

The laser scanner is relatively expensive among various scanners, but it can provide the highest functional indicators, so it is widely used in various industries.

The basic working principle of the laser scanner is: the handheld laser scanner emits a beam of light through a laser diode, and it shines on a rotating prism or a mirror that swings back and forth. The reflected light passes through the reading window and hits the bar code surface. After being reflected by the bars or spaces, it returns to the reader, which is collected and focused by a mirror, and converted into an electrical signal by a photoelectric converter. The signal will be decoded by the decoder software on the scanner or terminal.


There are two types of laser scanners: handheld and fixed: the handheld laser gun is easy to connect and flexible to use. The fixed laser scanner is suitable for reading the largest and smaller barcodes, effectively freeing both hands to work.


Advantages: The laser scanner can be used for non-contact scanning very well. Generally, the laser reader is the only choice when the reading distance exceeds 30cm; the laser reading barcode has a wide range of density, and can read irregular barcode surfaces or transparent Reading through glass or transparent adhesive paper, because it is non-contact reading, it will not damage the barcode label; because of the more advanced reading and decoding system, the first reading recognition success rate is high, the recognition speed is faster than the light pen and CCD, and the printing quality Bad or fuzzy bar code recognition effect is good; the bit error rate is very low (only about one in three million); the laser reader has good shock and drop resistance, such as: SymbolLS4000 series scanner, which can be 1.5 meters on cement floor Drop resistant.


Disadvantages: The only disadvantage of a laser scanner is its relatively high price, but if calculated from the sum of the purchase cost and the use cost, it is not much different from the CCD reader.