Friday, June 24, 2011

How Laser Printers work

Laser printers, which are one of the most popular printers used today. It uses the technology implemented in photocopiers to print the pages. Laser invented way back in 1969 at Xerox.

The key component of the laser printer is the revolving drum which is also called photoreceptor. This selenium coated drum is made of the highly photoconductive material. Initially is given the total positive charge and rolled in toner. After this, the toner is transferred to the page, fused with heat and pressure and it is then that the image is printed on the page.

After printing the page is passed on to the pair of heated rollers, this is done to melt the loose toner powder on the paper and henceforth the fuser rolls the paper and the paper comes out on the tray.

The basic difference between the inkjet and the laser printer is that inkjet uses the wet ink to print the characters on a page whereas laser printer uses the dry powdered substance, so the print of inkjet printer is vulnerable to smudging but this is not the case with the print of laser printer.

More importantly the cost per page in the laser printer is quite less as compared to the inkjet printer. So if a user has loads of pages to print daily and of good quality it would be advisable for him/her to use the laser printer. Often we can get the inkjet printer at a relatively cheaper price than laser printer but the cost of re-filling the cartridge overshoots the actual cost of an inkjet printer. So, the costs of operating an inkjet printer are much high after its purchase.

Resolution or the quality of the laser printer depends on the DPI or the Dots Inch printed on the paper. Dpi in laser printer can vary from 300 dpi in low end models to 1200 in the top end models. Colored laser printers can be eight to ten times more expensive than the monochrome laser printers.

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