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)
Nearby terms:
larval stage « lase « laser « laser printer »
Lasherism » last call optimisation » last-in
first-out
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