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ELF Fields Extremely low frequency (ELF) fields are electromagnetic (EM) fields that fluctuate or alternate more slowly than conventional radio waves. Such fields are produced by various consumer electronic devices and appliances. An ELF field is nothing like X rays or gamma rays, which cause radiation sickness. Nor is ELF radiation like ultraviolet (UV ), which can cause skin cancer over long periods. An ELF field cannot make anything radioactive. In computer systems, the ELF that you ve heard about is emitted mainly by electromagnetic CRT monitors. Other parts of a computer system are not responsible for much ELF energy. The LCDs used in many systems today produce essentially none. As you learned in Chap. 29, the characters and images in a CRT are created as electron beams strike a phosphor coating on the inside of the glass. The electrons constantly change direction as they sweep from left to right, and from top to bottom, on your screen. The sweeping is caused by deflecting coils that steer the beam across the screen. The coils generate magnetic fields that interact with the negatively charged electrons, forcing them to change direction. Because of the positions of the coils, and the shapes of the fields surrounding them, there is more magnetic energy radiated from the sides of an electromagnetic CRT than from the front. If there s any health hazard with ELF, therefore, it is greater for someone sitting off to the side of an electromagnetic CRT monitor, and less for someone watching the screen from directly in front at the same distance. If you re concerned about the ELF fields produced by CRT monitors, you might consider buying an electrostatic CRT unit that has been designed to minimize ELF fields, or buying a standalone LCD display panel. It s a good idea to arrange your workstation so your eyes are at least 0.5 m (about 18 in) away from the screen of a CRT monitor, and if you are working near other computer users, workstations should be at least 1 m (3 ft) apart.
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There are several types of printer in common use in personal and business computing applications today. The two most common are the inkjet printer and the laser printer. Less often used are the thermal printer and the dot matrix printer.
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Inkjet Printers In an inkjet printer, tiny nozzles spray ink onto the paper. Most of these printers are comparatively slow to produce an image, and the ink needs time to dry even after the image comes out, but the quality can be excellent. Inkjet printers are available in single-color and multicolor designs. The best color machines produce images of photo quality. In fact, some are designed especially to print digital photos. Inkjet printers require periodic replacement of the ink cartridges. These can be quite expensive, and for this reason, inkjet printers are not well suited for high-volume printing. Inkjet printers require paper with low fiber content. This keeps the ink from being carried along by capillary action before it dries, muddling or blurring the printout. Look specifically for inkjet paper in computer supply stores and department stores. Laser Printers A laser printer works like a photocopy machine. The main difference is that, while a photocopier creates a copy of a real image (the paper original), a laser printer makes a copy of a digital computer image.
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When data arrives at the printer from the computer, the encoded image is stored in the printer memory. The memory then sends it along to the laser and other devices. The laser blinks rapidly while it scans a cylindrical drum. The drum has special properties that cause it to attract the printing chemical, called toner, in some places but not others, creating an image pattern that will ultimately appear on the paper. A sheet of paper is pulled past the drum and also past an electrostatic charger. Toner from the drum is attracted to the paper. The image thus goes onto the paper, although it has not yet been permanently fused, or bonded, to the paper. The fuser, a hot pair of roller/ squeezers, does this job, completing the printing process. The main asset of laser printers is their ability to produce a large number of copies at high speed. They generally have excellent print and graphics quality for grayscale. Color laser printers are available as well, but they can be quite expensive. The image resolution of a laser printer ranges from about 300 dots per inch (dpi) for older units to 1200 dpi, 2400 dpi, or even higher resolutions in state-of-the-art machines. As far as the untrained eye can tell, 600 dpi is as good as a photograph. Laser printers can handle graphics and text equally well. If an image can be rendered on a photocopy machine, it can be rendered just as well on a laser printer.
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Thermal Printers A thermal printer uses temperature-sensitive dye and/or paper to create hard-copy text and images. Some thermal printers produce only grayscale images, while others can render full color. Thermal printers are often preferred by traveling executives who use portable computers, because these printers are physically small and light. A simple grayscale thermal printer employs special paper that darkens when it gets hot. A color thermal printer uses thick, heat-sensitive dyes of the primary pigments: magenta (pinkish red), yellow, and cyan (bluish green). Sometimes black dye is also used, although it can be obtained by combining large, equal amounts of the primary pigments. The print head uses heat to liquefy the dye, so it bleeds onto the paper. This is done for each pigment separately. Some, if not most, thermal printouts fade after awhile. Have you ever pulled out an old store receipt and found that it was washed-out or blank Thermal printers can be convenient in a pinch, but you should be aware that some of them have this problem. If you re keeping a receipt for tax purposes or for proof-of-purchase and it has been printed on thermal paper, make a photocopy or a digital scan of the receipt right away. You can recognize the output of a thermal printer because the paper curls up when it s fresh out of the machine. Dot Matrix Printers The dot matrix printer is the horse and buggy of the printing family. This type of printer is the least expensive, in terms of both the purchase price and the long-term operating cost. Dot matrix printers produce fair text quality for most manuscripts, reports, term papers, and theses. The mechanical parts are rugged, and maintenance requirements are minimal. Dot matrix printers can render some simple graphic images, but the quality is fair at best, and it can take a long time to print a single image. Dot matrix printers cannot reproduce detailed artwork or photographs with acceptable quality.
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