22What is a printer?An external hardware device responsible fortaking computer data and generating ahard copy of that data. Printers are one ofthe most commonly used peripherals andthey print text and still images on thepaper.
33““ImpactImpact PrinterPrinter”” These printers have amechanism thattouches the paper tocreate an image.These printers workby banging a printhead containing anumber of metal pinswhich strike an inkedribbon placed betweenthe print head and thepaper.
44““Non-Impact Printers”Non-Impact Printers” These printers createan image on the printmedium without the useof force. They don’ttouch the paper whilecreating an image.Non-impact printersare much quieter thanimpact printers as theydon’t strike the paper.
55““Dot Matrix PrinterDot Matrix Printer ”” The term dot matrixrefers to the process ofplacing dots to form animage. Its speed is usually 30 to550 characters persecond (cps). This is the cheapest andthe most noisy printerand has a low printquality. Dot Matrix were1stintroduced byCentronics in 1970.
7“Ink-Jet Printer” It is a non-impact printerproducing a high qualityprint. A standard Inkjetprinter has a resolutionof 300dpi. Newer modelshave further improveddpi. Inkjet printers wereintroduced in the laterhalf of 1980s and arevery popular owing totheir extra-ordinaryperformance.
8Advantages/ Dis-advantages Advantages: (1) High resolution output. (2) Energy efficient. (3) Many options to select. Dis-advantages: (1) Expensive. (2) Special paper required for higherresolution output. (3) Time consuming in case of graphicsprinting.
9Thermal Printer Thermal printers are in-expensive printersmostly used in faxmachines. The Thermalprinters are furtherclassified into two types. (1) Electro thermalprinters: (2) Thermal Waxprinters:
10“Laser Printer” Laser printers use very advanced technologyand produce a high quality output. Laser printerscan also produce high quality graphics images. Resolution is 600 to 1200dpi.
11How Laser printer Works? (1) Paper is fed and the drum rotates. (2) A laser beam conveys information from thecomputer to a rotating mirror and thus an imageis created on the drum. (3)The charges on the drum are ionized and thetoner sticks to the drum. (4)Toner is transferred from drum to paper. (5)Heat is applied to fuse the toner on the paper.
12“Multi-function printer” A multi function printerabbreviated as MFP is anall purpose device thatprints, faxes, copies andscans. A single multifunction printer canreplace several bulkydevices. A multi functionprinter is also known asAIO. These printers useinkjet technology andprovide high quality printbut at slow speed.