A printer is any device that prints text or illustrations on paper. There are many different types of printers. In terms of the technology utilized, printers fall into the following categories:
daisy-wheel: Similar to a ball-head typewriter, this type of printer has a plastic or metal wheel on which the shape of each character stands out in relief. A hammer presses the wheel against a ribbon, which in turn makes an ink stain in the shape of the character on the paper.Daisy-wheel printers produce letter-quality print but cannot print graphics.
dot-matrix: Creates characters by striking pins against an ink ribbon. Each pin makes a dot, and combinations of dots form characters and illustrations.
ink-jet: Sprays ink at a sheet of paper. Ink-jet printers produce high-quality text and graphics.
laser: Uses the same technology as copy machines. Laser printers produce very high quality text and graphics.
LCD & LED :Similar to a laser printer, but uses liquid crystals or light-emitting diodes rather than a laser to produce an image on the drum.
line printer: Contains a chain of characters or pins that print an entire line at one time. Line printers are very fast, but produce low-quality print.
thermal printer: An inexpensive printer that works by pushing heated pins against heat-sensitive paper. Thermal printers are widely used in calculators and fax machines.
Printers are also classified by the following characteristics:
quality of type: The output produced by printers is said to be either letter quality (as good as a typewriter), near letter quality, or draft quality. Only daisy-wheel, ink-jet, and laser printers produce letter-quality type. Some dot-matrix printers claim letter-quality print, but if you look closely, you can see the difference.
speed: Measured in characters per second (cps) or pages per minute(ppm), the speed of printers varies widely. Daisy-wheel printers tend to be the slowest, printing about 30 cps. Line printers are fastest (up to 3,000 lines per minute). Dot-matrix printers can print up to 500 cps, and laser printers range from about 4 to 20 text pages per minute.
impact or non-impact: Impact printers include all printers that work by striking an ink ribbon. Daisy-wheel, dot-matrix, and line printers are impact printers. Non-impact printers include laser printers and ink-jet printers. The important difference between impact and non-impact printers is that impact printers are much noisier.
graphics:Some printers (daisy-wheel and line printers) can print only text. Other printers can print both text and graphics.
fonts : Some printers, notably dot-matrix printers, are limited to one or a few fonts. In contrast, laser and ink-jet printers are capable of printing an almost unlimited variety of fonts. Daisy-wheel printers can also print different fonts, but you need to change the daisy wheel, making it difficult to mix fonts in the same document.
- Printer Driver
A program that controls a printer. Whenever you print a document, the printer driver takes over, feeding data to the printer with the correct control commands. Most modern operating systems come with printer driversfor the most common types of printers, but you must install them before you can use the printer. You can also download […]
- printer engine
The main component of a printer that actually performs the printing. The printer engine determines how fast and at what resolution the printer can print. Although there are many manufacturers of printers, many use the same printer engines. The difference between printers using the same printer engine revolves around other features, such as paper handling […]
A printed version of text or data. Another term for printout is hard copy.
- privacy statement
A Web document found on a company or organization’s Web site that details the type of personally identifiable information the company collects about its site visitors, how the information is used — including who it may be shared with — and how users can control the information that is gathered.
- probe message
In e-mail, a probe message is a type of bounce handling for e-mail address verification. It is commonly used in subscription-based mailing lists that easily become filled with invalid subscriber addresses. Once an e-mail has bounced from a specific address, a system will wait a specific amount of time then sends a warning message to […]