LASER PRINTER (Cont…)
The Process:When the laser hits the positively charged drum, a negative charge is created.
The toner is to the Laser Printer what ink is to an Inkjet. Basically toner is an electrically charged powder that has two main components; plastic and pigments. The Pigment is responsible for imparting colour onto the page. The pigment is blended with plastic particles to avoid smudging and make the of an image look sharp.
When the laser hits the drum, the positively charged toner attaches itself to the negatively charged regions of the drum.
Now the paper is passed over the drum. The paper is negatively charged by the transfer corona wires.
This charge is greater than the negative charge on the drum, and thus attracts positively charged toner pigment.
The pigment doesn't stick to the paper here, the paper is neutralized and passed through the fuser assembly.
The Fuser Assembly is nothing but Teflon quoted metal roller, heated by a quartz lamp.
The heat fuses the pigment to the paper.
After this, the pattern is cleaned off the drum using the charged corona wire and the printer is ready for the next page.
You should remember the process as:
Clean-Charge-Write-Develop-Transfer-Fuse
An mnemonic for remembering this is:
California-Cows-Won't-Dance-The-Fandango
