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An inkjet printer can print upto 2 to 10 pages per minute. Its printing is costly than that of dot matrix
printer but its quality is much better than that and it prints at a medium pace. Inkjet printer prints quality
images with resolution of 400 to 4000 dpi (dots per inch).
Laser Printer: Laser printer prints the content by laser technology.
l
It is very fast as it operates in a similar mechanism as that of the
photocopy machines. The laser beam makes shadow of the images
with the help of a toner and transfers them on paper.
It is also known as Page Printer because it actually stores the content
of the page in memory before printing it. It can print up to 5–300
pages in a minute and the resolution output ranges from 600 dpi to
2400 dpi.
Plotter
Plotter is an output device that helps in printing high quality poster, flex, visuals, charts, graphs, tables and
diagrams, etc. It can draw continuous lines and can produce output on a paper, polyester film or coloured
transparencies. In plotter, the figures are drawn by an electronic pen which is driven by a motor. It uses
inkjet cartridges (single or multi-coloured) to spray colours for drawing and sketching.
Plotter is mostly used in CAD (Computer Aided Design), CAM (Computer Aided Manufacturing) and for
printing Banners and DTP Flexes. Plotter can be classified into four categories:
l Flatbed Plotter l Micro-graphic Plotter
l Drum Plotter l Inkjet Plotter
l Flatbed Plotter: It consists of a fixed horizontal flat surface
on which paper or any other medium is fixed. The pen is
mounted on a carriage that moves along the horizontal and
vertical axis to print over the medium.
l Drum Plotter: It consists of one or more pen(s)
which moves across the drum. The output medium
is placed over the drum. The drum rotates either
clockwise or anticlockwise under the control of
plotting instructions sent by the computer. The pen
is mounted on the carriage and moves along with
the carriage either ‘left to right’ or ‘right to left’ on
the paper to print.
Basics of Information Technology 21

