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Laser Printers

Evolution of Laser Printers

evolution of laser printers

A laser printer is a type of digital printing machine that uses laser beams to produce printed output. The precise correlated interaction of the imaging drum, fuser and rollers is responsible for the systematic transfer of image on paper. Electrical potential is applied on each phase of the printing process.

Printing Resolution
Resolution determines the quality of the printouts. The higher the resolution, the better the resultant output. Early models could only deliver on the average 300 dpi (dots per inch), both for horizontal and vertical resolutions. However, recent developments have been really encouraging as resolutions had moved up to the 1200 dpi threshold. OEMs worked at enhancing output resolution which resulted to the tremendous improvement in print quality.

More tips and tricks to printer maintenance and how you can save on printing supplies from the Printer Encyclopedia.

Printing Speed
As printing technologies progressed, print speeds improved tremendously as well. It used to be that only monochrome printers can be expected to deliver the much bruited printing speed. Now even color laser printers can reach the 50 ppm (pages per minute) level. Thanks to the single pass printing technology, laser printing has reached enviable heights in speed.

Printing Technologies
Laser printers employ a laser beam delivered by the scanner assembly to create text and images. The laser scanner assembly delivers the digital image of the document in the form of regularly sequenced dots. The dots are written on the surface of the photosensitive drum.

Basically, the entire printing process will depend on varying electrical charges. As toner is positively charged it will literally cling to the negatively charged dots etched by the scanner. Since paper inherently has a higher negative charge, the formed image simply transfers to the paper surface as it comes in contact with the drum. Thereafter, the image on paper moves into the fuser. Remember the entire printing process occurs at blinding speeds.
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