SS1 WEEK: 9 TOPIC: OUTPIT DEVICES II

CONTENT PRINTER There are three types of computer printers: 1. Inkjet: Inkjet printers spray a jet of special ink on the surface to create an ink under control of electric field. Ink jet is used where the volume of print out is not very large. 2. Dot matrix: A Dot matrix printer has a print head that has a series of steel pins. It uses ink ribbon to create images on surface. 3. LaserJet: uses xerography in line with electronically controlled laser beam to produce characters on the photo conductive surface of rotating drum. EXAMPLES OF PRINTERS 1. Thermal Printers: These are non-impact, they are very slow. They form characters by burning them on specifically treated papers 2. Electrostatic Printer: This form of printers work by charging paper electrically. The paper then passes through a toner solution. Particles of ink adhere to the charged areas of the paper. 3. Dot Matrix Printers: These use a dot matrix printing technique which prints characters as a matrix of dots. Printers can also be categorized by whether the printer heads strikes the paper or not; if it does, the printer is called an impact printer. If not it is a non-impact printer. A non-impact printer is faster because it minimizes the physical movement required during the printing process. NON-IMPACT PRINTERS IMPACT PRINTERS  LaserJet printers  Inkjet printers  Thermal printers  Electro thermal printers  Daisy wheel printers act  Dot matrix printer