LED printer

LED printer

An LED printer is a recently-developed type of computer printer. LED technology uses a light-emitting diode array as a light source in the printhead. The LED bar pulse-flashes across the entire page width and creates the image on the print drum or belt as it moves past.

LEDs are more efficient mechanically than conventional laser printers, since they have fewer moving parts. Depending on design, LED printers can have faster rates of print than some laser-based designs, and are generally cheaper to manufacture. Laser systems rely on elaborate combinations of rotating mirrors and lenses that must remain in alignment throughout their use. The laser scans from one end of a line to another, then starts on the next line. Unlike laser printers, the LED printhead is solid-state and has no moving parts.

There are concerns about the LEDs in the printer experiencing early burnout due to repeated on/off switching as a print is made.fact|date=August 2008 LED printing was invented by Casio. [ [http://www.pctechguide.com/52Lasers_LED_printers.htm Guides/Input & Output/Laser Printers - PC Technology Guide ] ]

Resolution

LED printers have a technical limitation that prevents ready competition with the highest quality laser printers; only so many LEDs can be packed into a linear physical space. A printer having 300 dots-per-inch resolution must have 300 LEDs per inch, and a printer with 600 dpi resolution must have 600 LEDs per inch.

Many laser printers now commonly print at 1200 dpi, but making LEDs that small is very difficult. It is not uncommon to see LED printers that use a skewed image resolution such as 600x1200 dpi. The horizontal resolution is limited to 600 dpi by the physical size of the LEDs, but the vertical resolution is simply a matter of how fast the LEDs flash as the paper passes by. Image quality depends on the spot shape of each LED. A round pixel/spot will mean that pixels overlap in the vertical direction, while a squashed-oval pixel/spot allows the spots to not overlap and permit a slightly better image quality.

References

* [http://www.compudirect.net/oki/led_versus_laser.htm "Okidata LED Versus Laser Printers"]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • LED Printer —   [engl.], LED Drucker …   Universal-Lexikon

  • printer — [n1] typesetter compositor, pressperson, publisher, typographer; concepts 174,203,205 printer [n2] computer peripheral device ball printer, character printer, color printer, daisywheel printer, dot matrix printer, graphics printer, ink jet… …   New thesaurus

  • Printer (computing) — A modern printer with scanning/copying capability Small printer …   Wikipedia

  • printer — c.1500, agent noun from PRINT (Cf. print). In the computer sense, from 1946. Printer s bible (c.1702) so called from mistaken substitution of printers for princes in Psalm cxix:161, which led to the misreading: Printers have persecuted me without …   Etymology dictionary

  • Printer driver — In computers, a printer driver or a print processor is a piece of software that converts the data to be printed to the form specific to a printer. The purpose of printer drivers is to allow applications to do printing without being aware of the… …   Wikipedia

  • Printer — Imprimante Imprimante à jet d’encre Canon. Les imprimantes ont été conçues dès l’apparition des premiers ordinateurs, pour permettre la consultation et la conservation sur support papier des résultats produits par les programmes informatiques. En …   Wikipédia en Français

  • Laser printer — HP LaserJet 4200 series printer, installed atop high capacity paper feeder …   Wikipedia

  • Robert Crowley (printer) — Robert Crowley also Robertus Croleus, Roberto Croleo, Robart Crowleye, Robarte Crole, and Crule (c. 1517 ndash; June 18 1588), was a stationer, poet, polemicist and Protestant clergyman who was among the Marian exiles at Frankfurt. Crowley… …   Wikipedia

  • Dot matrix printer — Epson VP 500 Printer (Cover removed) …   Wikipedia

  • Dye-sublimation printer — Samsung SPP 2040 printing a photograph. Part of a series on the …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”