A Primary corona is a component in a laser printer that prepares the photosensitive drum for writing, causing it to receive a negative electrostatic charge.
The Primary corona generally uses static electricity to paint the photoreceptive drum and the copy paper piece with a layer of positively charged ions. For a photocopier to work, a bunch of positive charges is generated on the surface of both the drum and the copy paper. The corona wires accomplish these tasks.
Laser printers generate electrostatically charged dots on a light-sensitive drum or photoreceptive drum which attracts toner powders. Then toner is transferred to the paper and fixed by a heating process. As a result, laser printers deliver crisp black and white and brilliant colour prints.
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