TAILIEUCHUNG - Devices that Output Hard Copy

Image quality – Measured in dots per inch (dpi). Most printers produce 300 – 600 dpi. Speed – Measured in pages per minute (ppm) or characters per second (cps). Initial cost – Consumer printers cost $250 or less, but professional printers can cost thousands of dollars. Cost of operation – This refers to the cost of supplies | lesson 6 Devices that Output Hard Copy * This lesson includes the following sections: Overview of Printers Dot Matrix Printers Ink Jet Printers Laser Printers Snapshot Printers Other High-Quality Printers * Overview of Printers Categorizing Printers Evaluating Printers * Overview of Printers - Categorizing Printers Printers fall into two categories: Impact printers use a device to strike an inked ribbon, pressing ink from the ribbon onto the paper. Non-impact printers use different methods to place ink (or another substance) on the page. * Overview of Printers - Evaluating Printers When evaluating printers, consider four criteria: Image quality – Measured in dots per inch (dpi). Most printers produce 300 – 600 dpi. Speed – Measured in pages per minute (ppm) or characters per second (cps). Initial cost – Consumer printers cost $250 or less, but professional printers can cost thousands of dollars. Cost of operation – This refers to the cost of supplies used by the printer. * Dot Matrix Printers How Do Dot Matrix Printers Work? Performance * Dot Matrix Printers - How Do Dot Matrix Printers Work? Dot matrix printers are a common type of impact printer. A dot matrix printer's print head contains a cluster of pins. The printer can push the pins out to form patterns in rapid sequence. The pins press an inked ribbon against the paper, creating an image. * * Dot Matrix Printers - Performance Lower-resolution dot matrix printers use nine pins. Higher-resolution models have 24 pins. Speed is measured in characters per second (cps). Some dot matrix printers print 500 cps. * Ink Jet Printers How Do Ink Jet Printers Work? Performance * Ink Jet Printers – How Do Ink Jet Printers Work? Ink jet printers are an example of non-impact printers. The printer sprays tiny droplets of ink onto the paper. Ink jet printers are available for color and black-and-white printing. * * Ink Jet Printers - Performance Ink jet printers offer speeds of (2 – 4 pages per minute ppm) and resolution (300

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