Laser printers are composed of lasers, acousto-optic modulators, high-frequency drivers, scanners, synchronizers and optical deflectors, etc. Its function is to modulate the binary lattice information sent by the interface circuit on the laser beam, and then scan to the photosensitive body. The photoreceptor and the camera mechanism form an electrophotographic transfer system, which transfers the image and text images shot on the photosensitive drum to the printing paper. The principle is the same as that of the copier. Laser printers are non-strike output devices that combine laser scanning technology and electronic imaging technology. It has different models and different printing functions, but the working principle is basically the same. It has to go through seven processes: charging, exposing, developing, transferring, eliminating electricity, cleaning, and fixing, of which five processes are carried out around the photosensitive drum. . When the text or image to be printed is input into the computer, it is preprocessed by computer software. Then it is converted by the printer driver into a print command (printer language) that the printer can recognize and sent to the high-frequency drive circuit to control the on and off of the laser transmitter to form a dot matrix laser beam, and then pass the scanning mirror to the electronic imaging system. The photosensitive drum in the photosensitive drum is exposed to axial scanning, and the longitudinal scanning is realized by the rotation of the photosensitive drum itself.
