Use a laser beam to quickly "project" digital graphics or documents onto a photosensitive surface. Electron charging occurs at the position hit by the laser beam. Then, like a magnet, it attracts some fine iron powder particles called "toner powder." For monochrome printers, these toners are black, and for color printers, they are cyan, magenta, yellow, and black.

The working principle of laser printing is like copying, using electronic imaging transfer technology to print. Specifically: First, the computer converts the content to be printed into the original image in the form of a data sequence, and then transmits the data to the printer.

The microprocessor in the laser printing deciphers these data into a dot pattern, and the deciphered dot pattern is sent to the laser generator. The laser generator quickly turns on and off according to the content of the pattern, and projects the laser beam to a On the charged rotating drum, wherever the surface of the drum is irradiated by the laser, the charge is released, but the areas where the laser is not irradiated are still charged. The toner absorbed by the charged charge is transferred to the paper. Finish printing.