30079_13b - Resolution can be as high as 400 X 800 dpi with...

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Resolution can be as high as 400 X 800 dpi, with gray scales ranging from 16-128 values. These are medium- to high-throughput devices, producing complex images in about a minute. On-board computing facilities, such as RISC processors and fast hard disk storage mechanisms, contribute to rapid drawing and processing speeds. Expansion slots accommodate interface cards for LANs or parallel ports. InkJet Plotter. InkJet plotters and printers fire tiny ink droplets at paper or a similar medium from minute nozzles in the printing head. Heat generated by a separate heating element almost instantaneously vaporizes the ink. The resulting bubble generates a pressure wave that ejects an ink droplet from the nozzle. Once the pressure pulse passes, ink vapor condenses and the negative pressure produced as the bubble contracts draws fresh ink into the nozzle. These plotters do not require special paper and can also be used for preliminary drafts. InkJet plotters are available both as desktop units for 8.5 X 11-in. graphics and in wide format for engineering CAD drawings. Typical full-color resolution is 360 dpi, with black-and-white resolution rising to 700 X 720 dpi. These devices handle both roll-feed and cut sheet media in widths ranging from 8.5-36 in. Also, ink capacity in recently developed plotters has increased, allowing these devices to handle large rolls of paper without depleting any one ink color. InkJet plotters are very user-friendly, often including sensors for the ink supply and ink flow that warn users of an empty cartridge or of ink stoppage, allowing replacement without losing a print. Other sensors eliminate printing voids and unwanted marks caused by bubbles in the ink lines. Special print modes typically handle high-resolution printing by repeatedly going over image areas to smooth image lines. In addition, inkjet plotters typically contain 6-64 megabytes of image memory and options such as hard drives, an Ethernet interface for networking, and built-in Postscript interpreters for faster processing. InkJet plotters and printers are increasingly dominating other output technologies, such as pen plotters, in the design laboratory. Laser Plotter. Laser plotters produce fairly high-quality hard copies in a shorter period of time than pen plotters. A laser housed within the plotter projects rasterized image data in the form of light onto a photostatic drum. As the drum rotates further about its axis, it is dusted with an electrically charged powder known as toner. The toner adheres to the drum wherever the drum has been charged by the laser light. The paper is brought into contact with the drum and the toner is released onto the paper, where it is fixed by a heat source close to the exit point. Laser plotters can quickly produce images in black and white or in color, and resolution is high.
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