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How to classify the bar code scanning module according to the light source?


The bar code scanning module can be divided into one dimensional code module and a two-dimensional code module according to the scanning module, and can be divided into a laser bar code scanning module and a red light bar code scanning module according to the light source. The following is a source of electrons to analyze the difference between laser bar code scanning module and red bar code scanning module:

1, laser barcode scanner module principle by the internal laser device play a laser spot, playing in a reflective piece of mechanical structure device, and then rely on the vibration motor to swing the laser point to shine a laser line on the bar code, after A-D decoded into digital signal. The red light bar code scanning module is generally used for the LED light emitting two light source, which is based on the CCD photosensitive element, and then through the photoelectric signal conversion.

2, laser barcode scanner module most by glue to fix the machine caused by mechanical device, so it was swinging in the often easy to damage, swing off, so we can often see some laser gun falls scanning light source is a point, resulting in very high repair. Red bar code scanning module with no mechanical structure, so the anti fall is the laser FabI, so had better stability, red scanning modular rework rate is far lower than that of laser scanning module.

3, the laser is a strong stimulated emission of radiation energy, good parallelism of light and are now mostly red is composed of a LED luminous, red is not what we say that kind of infrared, infrared physics definition of is temperature object spontaneous outward radiation of electromagnetic wave, not visible. Infrared includes all wavelengths greater than red light, while the laser refers to a certain wavelength of light, they are not necessarily linked to two, does not belong to the same field.

4, laser is by the stimulated emission of light amplification of radiation, infrared is naked eye cannot be observed in the spectra in frequency of smaller wavelength larger part of a wavelength from 0.76 to 400 microns, from their wavelength and energy decided in light red light penetration and anti-interference performance to be worse than the laser, so that in light outdoor light than in red light good.


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