Laser printer

Updated: 09/15/2017 by Computer Hope

HP laserjet printerThe laser printer was first developed at Xerox PARC by Gary Starkweather and released in 1971 that utilizes laser technology to print images on the paper. Laser printers are often used for corporate, school, and other environments that require print jobs to be completed quickly and in large quantities. In the picture, is a Lexmark C782n laser printer and a good example of a laser printer. As the image shows, a laser printer is usually larger than an inkjet printer found in most homes.

Note: Because of the amount of power a laser printer can draw it is not recommend that a laser printer be connected to a UPS. Instead, connect the laser printer to a surge protector only.

How a laser printer works and its printing steps

Below is a chart of the steps a laser printer takes to print.

Cleaning

This process removes the prior image information and toner from the drum.

Conditioning

The corona wire applies a uniform, positive charge to the photoreceptor drum.

Writing

The image to be printed is drawn onto the drum by using a laser to "carve out" positive charges and leave behind negative ones. As an aside, the laser in the printer uses light sources like LED or LCS (Liquid Crystal Shutter).

Developing

The toner in the ink roller is ionized with a positive charge so that it will be attracted to the areas on the drum previously given a negative charge by the laser.

Transfer

The toner of the drum is transferred to the paper by either a positively ionized field (created by a transfer corona wire) or by a transfer roller in newer printers. The toner is not yet permanently set on the paper and requires the last stage.

Fusing

Heat and pressure are applied to the paper and toner by two fuser units. The toner melts and is pressed into the paper like doing an iron-on transfer to a T-shirt.

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