Laser printers are using the principle of induction charging load on semiconductor surface graphics design. React to this table image, and discharge in the range specified, creating a static image. Then, make the image and coloring materials (toner) contact, coloring material selectively adsorbed on the static image, and then transfer on plain paper.
Laser printers are equipped with a controller used to coordinate laser beam scanning and adjusting movement of the drum and paper light to control print with or without. Resolution is usually 12~16/mm and printed out the narrowest bar code 0.20mm. The printer is suitable for high and medium density bar codes printed.