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Printers
Types of printers
By: David K. Every
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2002-03-11 08:17:40
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 uyers can get befuddled by all the terms and jargon when they are looking at buying a printer; but it really isn't hard. There are only a few basic technologies that are popular right now in printers. There are Laser Printers, Ink-Jet Printers, and impact printers.
Now impact printers are really becoming antiques; you don't see them around much. They are called this because they work like an old typewriter (with a little ball or keys with letters) that strike a ribbon and transfer a piece of paper. Or another style is called a "dot matrix", because little pins would tap out a lot of little dots in a grid to make letters and shapes. The only reason they still exist, is because they can still fill out older style forms with carbon or create brail transcripts; since they actually strike something to the paper with some force. But now days these are becoming very rare other than at old bureaucracies.
Laser printers work by shooting a laser at a rotating drum. Where the laser hits the drum, it magnetizes it, and the drum passes over some microscopic ink-dust; which gets picked up in the magnetized areas. As the drum keeps rotating a piece of paper is passed by, and underneath is an even stronger magnetic attraction, which causes the dust to jump from the drum to the paper. The paper passes by a hot "fuser" which basically melts or bonds the ink-dust into the paper.
Ink Jet printers work by having little nozzles squirt ink at a page, as this head (which holds a bunch of nozzles), passes back and forth across the page. These little nozzles literally "jet" the ink, and that's where the name comes from. An older variant actually called the ink shot at the page "bubbles", and so the printers were called bubble-jets; but it is the same basic thing.
There are a few other "rarer" technologies; like some thermal transfer or wax/die sublimation printers for higher end photographic work. They work sort of like little iron-on transfer T-Shirt decals; literally heating on some colors to a page. But they tend to be for specialty jobs, like making photos.
Now laser and ink-jet printers each have different advantages and disadvantages, that can help you decide which you want to buy.
The advantage to laser printers is that they can be very fast (do many pages quickly), and they use a dry toner (ink-dust). Once the ink is fused to the paper, it doesn't fade or rub off. Toner is usually cheaper for how many copies you get out of it; but more expensive overall, just you replace it much less often.
The disadvantage is that most of them are black and white, and they tend to be bigger and more expensive. There are some color laser printers, but they tend to be even more expensive, and so most individuals don't buy them yet; being more for businesses.
Ink-jet printers tend to be less expensive to buy the printer, and they almost all do color. But the ink tends to run out more often and require more refills than laser printers. And because the ink just squirted on to paper, rather than fused in so it can fade over time and if you don't wait for it to dry, or you drip water on it, then it can smear. Also since ink-jets literally squirt ink on the paper, the paper can absorb the ink and you can get bleeding effects, or dramatically different results depending on the quality of paper. Whereas toner based laser printers tend to look better on cheaper paper.
In general, if you're doing fewer pages and in the home, and you want to be able to do color and don't mind lower volume; then ink-jet printers are great. But if you tend to be working on a book, transcripts or do more high volume printing; then laser printers can be much better values. 
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