Printers n plotters
- 2. 22 What is a printer? An external hardware device responsible for taking computer data and generating a hard copy of that data. Printers are one of the most commonly used peripherals and they print text and still images on the paper.
- 3. 33 ““ImpactImpact PrinterPrinter”” These printers have a mechanism that touches the paper to create an image. These printers work by banging a print head containing a number of metal pins which strike an inked ribbon placed between the print head and the paper.
- 4. 44 ““Non-Impact Printers”Non-Impact Printers” These printers create an image on the print medium without the use of force. They don’t touch the paper while creating an image. Non-impact printers are much quieter than impact printers as they don’t strike the paper.
- 5. 55 ““Dot Matrix PrinterDot Matrix Printer ”” The term dot matrix refers to the process of placing dots to form an image. Its speed is usually 30 to 550 characters per second (cps). This is the cheapest and the most noisy printer and has a low print quality. Dot Matrix were 1st introduced by Centronics in 1970.
- 6. 66 ““Advantages/Dis-advatages of Dot-Matrix” Advantages: (1) In-expensive. (2) Low per page cost. (3) Energy efficient. Dis-advantages: (1) Noisy (2) Low resolution (3) Limited fonts flexibility (4) Poor quality graphics output.
- 7. 7 “Ink-Jet Printer” It is a non-impact printer producing a high quality print. A standard Inkjet printer has a resolution of 300dpi. Newer models have further improved dpi. Inkjet printers were introduced in the later half of 1980s and are very popular owing to their extra-ordinary performance.
- 8. 8 Advantages/ Dis-advantages Advantages: (1) High resolution output. (2) Energy efficient. (3) Many options to select. Dis-advantages: (1) Expensive. (2) Special paper required for higher resolution output. (3) Time consuming in case of graphics printing.
- 9. 9 Thermal Printer Thermal printers are in- expensive printers mostly used in fax machines. The Thermal printers are further classified into two types. (1) Electro thermal printers: (2) Thermal Wax printers:
- 10. 10 “Laser Printer” Laser printers use very advanced technology and produce a high quality output. Laser printers can also produce high quality graphics images. Resolution is 600 to 1200dpi.
- 11. 11 How Laser printer Works? (1) Paper is fed and the drum rotates. (2) A laser beam conveys information from the computer to a rotating mirror and thus an image is created on the drum. (3)The charges on the drum are ionized and the toner sticks to the drum. (4)Toner is transferred from drum to paper. (5)Heat is applied to fuse the toner on the paper.
- 12. 12 “Multi-function printer” A multi function printer abbreviated as MFP is an all purpose device that prints, faxes, copies and scans. A single multi function printer can replace several bulky devices. A multi function printer is also known as AIO. These printers use inkjet technology and provide high quality print but at slow speed.