Final answer:
The exposing or writing step in laser printing uses a laser to create a positive charge image on a photoconducting drum, which subsequently attracts negatively charged toner that is then transferred onto paper and fused by heat.
Step-by-step explanation:
Exposing or Writing Step of Laser Printing
The exposing or writing step in a laser printer involves creating a precise image on a photoconducting drum using a laser. As the laser beam is scanned across the drum, it leaves a positive charge image. This charge pattern mirrors the document or image to be printed. The areas exposed to the laser light lose their charge, creating a pattern that corresponds to the image.
Following this, toner with a negative charge is applied, which adheres to the positively charged areas of the drum. When paper is introduced, possessing a greater positive charge than the drum, it attracts the negatively charged toner from the drum surface. The paper with the toner is then passed through heated pressure rollers that melt the toner, fusing it to the paper fibers permanently.
This process of laser printing is possible due to the preciseness with which laser light can be controlled, allowing for the production of high-quality images on paper. Laser printing is a highly sophisticated process and may involve complex information processing for detailed graphics and fonts.