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The principle of laser bar code scanner

  • Author:Crystal
  • Release on :2015-11-18
   The most commonly used laser scanner mainly information on laser scanner scans the bar code, also known as laser scanners, laser reader, a laser diode as a light source of a single line bar code scanning equipment, bar code and application scanning in accordance with the different, is divided into 1D wired scanner, 2D wired scanner, 1D wireless scanner, 2D wireless scanner and scanning platform.
     Laser scanner is when the user touches the power switch or the appropriate equipment so that the scanner is powered, VLD issued a red laser beam passes through the beam expander lens is expanded beam onto the mirror surface reflection can swing to the bar code form a laser spot. When the mirror swings occur based on the position of the laser spot on the optical reflection principle barcode changes, continuous oscillating mirror, you'll see a red laser line on the bar code, which is due to the phenomenon of persistence of vision. Barcode surface is rough, according to the bar code laser spot is reflected, the bars and spaces of reflection intensity is different, diffuse light incident on the mirror, and then reflected by the mirror to the collector, the collector a light, filtered by the filter natural light into the stray photodiode generates photoelectric sensor signal, and then amplified, plastic decoded into useful information, transmitted to the host.
Swept through a small bar code scanning gun can know all the information quickly and accurately.