Laser printers and LED printers the light path principle

    The imaging principle of a laser printer, and LED printer is substantially the same, are relying carrying the light exposure of the image signal of latent image formed on the photosensitive drum, while the image latent image in the absorption toner transferred to the print paper and the fixing to complete the print job. Their biggest difference is that a different type of light source and the optical system.portable lights

    A light source of the laser printer is a high-power laser diode, not under control of the print signal, the laser tube emitting a laser beam according to the printing requirements, the laser beam through the focus lens, a projection on to a high-speed rotation of the multi-prism prism stop rotation, always change the reflection angle of the laser beam, thereby forming a single change in position of the spot beam, this beam after the the shaping change direction through the lens group, is formed on the photosensitive drum in the axial direction of reciprocating scanning laser, the photosensitive The drum exposure, the photosensitive drum is rotated in a single line photosensitive After the laser beam continues to the next row photosensitive photosensitive process to complete the photosensitive drum.

    LED printers thousands of tiny LED light-emitting diodes are arranged in a queue, placed axially above on the photosensitive drum, corresponding to a physical resolution of each printer one light emitting diode under the control of the printing signal, the need to print part of the LED tube is lit, they produce light through the focusing head projected directly at the surface of the photosensitive drum, the photosensitive drum exposure, the photosensitive drum is rotated, LED re-lit, so that the next line photosensitive rechargeable fans request, after the completion of the single row photosensitive, thereby completing the photosensitive process.