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Monday, May 17, 2010

Laser Printer principal

How Laser Printer work

When we give a print command to printer , print process data is received by printer then laser printer start a print job in a sequence.

1. Printer apply a positive electrical charge to the drum unit.

2. The laser system ‘writes’ the page image onto the drum with a negative charge and creating an electric “virtual negative” of the image.

3.The drum unit rotates, and as the image is written on it, it picks up toner, the laser printer equivalent of ink. The toner is positively charged, and so it sticks to the image that the laser drew. The paper presses against the drum, and receives the toner image.

4.When the paper first picks up the toner, the image is not set. Toner is a dry, dusty material, and it the electric charge cannot hold it strongly to the paper. In order to make the image permanent, the paper runs through the fuser, which heats it, and melts the toner onto the page. The paper exits the printer, and you have your print out.

The Picture image given below clearly show layout to that how a laser printer works is working :

Laser_printer_work

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