Xerograafiasüsteem

Xerograafiasüsteem is a dry copying process that utilizes electrostatics to produce images. The core principle involves transferring a latent electrostatic image to a copy medium, typically paper. This process is commonly known as xerography or electrophotography.

The xerographic process begins with a charged photoreceptor drum, which is often coated with a semiconductor material like selenium or an organic photoconductor. An image of the original document is projected onto this drum, selectively discharging the areas that correspond to light parts of the original. The areas corresponding to dark parts, which retain their charge, form the latent electrostatic image.

Next, a dry, powdered ink called toner is applied to the charged drum. The toner particles are oppositely charged to the latent image and are attracted to the charged areas, adhering to them and forming a visible toner image. This toner image is then transferred from the drum to a sheet of paper, which is also electrostatically charged to pull the toner off the drum.

Finally, the toner image on the paper is fused permanently by applying heat and pressure. This melts and presses the toner particles into the paper fibers, creating a durable copy. The photoreceptor drum is then cleaned and recharged, ready for the next cycle. This technology is the foundation of modern photocopiers and laser printers.