Printers

Printers by definition are output devices that transmit data in electronic form to print on printable media such as paper, photographic paper and CD/DVD media. They work on different principles and are divided into different categories including dot matrix printers, inkjet printers, laser printers and thermal printers.

Dot matrix printers use the oldest, yet still popular printer technology. They print using a standard 8, 9 or 24 needles located in the printhead that runs over inking ribbons and prints through impact to compose printed text and images. An advantage of the dot matrix is that it can print several copies at a time (via a carbon copy). In addition, the print tape wears out gradually and therefore you know when it must be replaced. The paper used by dot matrix printers have side perforation, which provides very good paper leadership and accurate printing.

Inkjet printers are the most commonly used printers today and are especially popular in homes and small offices. They are powerful and have an interesting blend of cost and performance (including quality printing). The technology uses a microscopic nozzle which applies miniature droplets to paper formimg text and images. Multifunction inkjet printers can also function as a copier, scanner and fax machine, and add further appeal to this technology. Overall these printers are a cost effective, common printing solution that appear in modern homes and share some qualities of more expensive office equipment.

Laser printers use a similar principle as copiers. The image or text is marked by a laser beam on the photosensitive (semiconducting) cylinder. It is then applied to the toner (powder), which is fastened only to locations previously illuminated by the laser, and transfers to paper. The entire process is completed by "fusing", ie thermal fixation. This method is accurate and produces high-quality printed materials. Laser printers are also available as multifunction devices that can handle printing, copying, scanning and faxing.

Thermal printers use a print head to produce images and text on special thermal paper as it passes over it. This technology does not use ink, toner and similar accessories which is the main advantage. Thermal printers are often used as a small compact printer for printing photographs or as POS printers.

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