laser printers - meaning and definition. What is laser printers
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What (who) is laser printers - definition

ELECTROSTATIC DIGITAL PRINTING PROCESS
Laser jet; Laser printers; Laserprinter; Laser-class printer; Lazer printer; Color laser printer; Laser Printer; Laser print; Colour laser printer; Waste toner; Laser printer; Laser phototypesetting; NEC Silentwriter; Silentwriter; Transfer belt; Photo conductor unit; History of laser printing
  • Magnification of color laser printer output, showing individual toner particles comprising 4 dots of an image with a bluish background
  • Applying a negative charge to the photosensitive drum
  • [[Fuji Xerox]] color laser printer C1110B
  • [[Gary Starkweather]] (seen here in 2009) invented the laser printer.
  • [[HP LaserJet]] 4200 series printer, installed atop additional 500-sheet paper tray
  • Laser light selectively neutralizes the negative charge on the photoreceptive drum, to form an electrostatic image
  • Toner is fused onto paper with heat and pressure
  • Diagram of a laser printer
  • A video on research done on printer emissions
  • Small yellow dots on white paper, generated by a color laser printer, are nearly invisible. (Click to see higher-resolution image)

laser printer         
<printer> A non-impact high-resolution printer which uses a rotating disk to reflect laser beams to form an electrostatic image on a selenium imaging drum. The developer drum transfers toner from the toner bin to the charged areas of the imaging drum, which then transfers it onto the paper into which it is fused by heat. Toner is dry ink powder, generally a plastic heat-sensitive polymer. Print resolution currently (2001) ranges between 300 and 2400 dots per inch (DPI). Laser printers using chemical photoreproduction techniques can produce resolutions of up to 2400 DPI. Print speed is limited by whichever is slower - the printer hardware (the "engine speed"), or the software rendering process that converts the data to be printed into a bit map. The print speed may exceed 21,000 lines per minute, though printing speed is more often given in pages per minute. If a laser printer is rated at 12 pages per minute (PPM), this figure would be true only if the printer is printing the same data on each of the twelve pages, so that the bit map is identical. This speed however, is rarely reached if each page contains different codes, text, and graphics. In 2001, Xerox's Phaser 1235 and 2135 (with Okidata engines) could print up to 21 colour ppm at 1200x1200 DPI using a single-pass process. Colour laser printers can reach 2400 DPI easily (e.g. an HP LaserJet 8550). Some printers with large amounts of RAM can print at engine speed with different text pages and some of the larger lasers intended for graphics design work can print graphics at full engine speed. Although there are dozens of retail brands of laser printers, only a few original equipment manufacturers make {print engines}, e.g. Canon, Ricoh, Toshiba, and Xerox. (2002-01-06)
laser printer         
(laser printers)
A laser printer is a computer printer that produces clear words and pictures by using laser beams.
N-COUNT
laser printer         
¦ noun a computer printer in which a laser is used to form a pattern of electrostatically charged dots on a light-sensitive drum, which attracts toner.

Wikipedia

Laser printing

Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly passing a laser beam back and forth over a negatively-charged cylinder called a "drum" to define a differentially-charged image. The drum then selectively collects electrically-charged powdered ink (toner), and transfers the image to paper, which is then heated to permanently fuse the text, imagery, or both, to the paper. As with digital photocopiers, laser printers employ a xerographic printing process. Laser printing differs from traditional xerography as implemented in analog photocopiers in that in the latter, the image is formed by reflecting light off an existing document onto the exposed drum.

Invented at Xerox PARC in the 1970s, laser printers were introduced for the office and then home markets in subsequent years by IBM, Canon, Xerox, Apple, Hewlett-Packard and many others. Over the decades, quality and speed have increased as prices have decreased, and the once cutting-edge printing devices are now ubiquitous.

Examples of use of laser printers
1. Officers recovered laser printers, computers and other counterfeiting equipment.
2. They believe the culprit is the toner used in laser printers and photocopiers instead of ink.
3. "We soon realised that we were seeing air pollution originating indoors, from laser printers.
4. Canon supplies laser printers to Hewlett–Packard Co., the world‘s biggest printer maker.
5. The disturbing findings come from a study of 62 laser printers carried out by Australian scientists.