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LASER PRINTER
It has six main components: 1. The image processor with its own memory and it is programmed to convert text data into images which are then stored, ready for processing and printing. 2. Charged roller or charged corona wire
3.Photosensitive drum: aluminum cylinder coated with photosensitive material 4. Charged toner 5. Fuser assembly 6. Laser assembly
The laser printer uses a mechanism with a laser source produced by a laser beam. This laser is charged electrically to a surface where a special dust (toner) is added and heats forming the desire characters. In this kind of printers the type of letter can be defined or be set by the program, so it allows a great variety of fonts and sizes.
STEPS FOR PRINTING 1. Incoming data: the computer sends data to the printer. 2.Drum preparation: the drum must be cleaned to remove any traces of previous pages. 3.Drum writing: The data in the printer’s memory is written to the drum using a laser. It writes by shining a very precise laser on the photosensitive drum in certain spots, changing the electrical charge in certain spots. 4. Paper feed: Feed rollers draw the paper into the printer from the paper tray. 5.Toner pickup: As the paper is being drawn in, the toner is being applied to the drum. 6.Toner transfer to paper: When the image exists on the drum, complete with toner, the drum operates and begins printing the page. 7.Fusing the toner to the paper:The image is now on the paper, but it’s not secure there; for permanent application, it must be fused. Fusing is basically melting the toner’s plastic particles so they stick, or fuse, to the fibers in the paper.
Valeria Michelle Fdz Ma.Fernanda Bello
webpages: http://www.tech-faq.com/how-does-a-laser-printer-work.shtml http://www.chaminade.org/mis/Articles/HowLaserPrintersWork.htm book: Informatica Basica, segunda edicion. Editorial Mc Graw Hill pg. 172
