printing information on a paper is known as “hard copy”. there are two main types of printers: -...
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Output Devices
Printing
Information on a
paper is known as
“Hard Copy”.
There are two
main types of
printers: - Impact
- Non-Impact.
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Impact Printers
Relatively cheap
Slow and Noisy
Quality is not very good
Some types of impact printers:
- Dot Matrix Printer
- Daisywheel.
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Dot Matrix Printer
• Dot Matrix Printer contains a
print head that strikes a
ribbon between the page.
Used in offices to print bills
and invoices
A dot matrix printer
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Daisy Wheel
The Daisy Wheel printers has printing
characters at the end of the spokes on the
wheel.
Used in some electric typewriters and
printers,
A daisy wheel showing detail of the characters
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Non Impact Printers
Non-Impact Printers are much quieter than
impact printers, as their printing heads do not
strike the paper. A little more expensive but
faster and quality is better.
Some non-impact printers are:
- Thermal Printer
- Ink Jet Printer
- Laser Printer
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Thermal PrinterComprises of a thermal head that generates
heat to produce a printed image on paper.
Used in calculators and fax machines.
A fax machine uses a thermal printer.
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Ink Jet PrintersSprays ink onto the paper
producing a high quality
text and graphics.
Used at home or small
officesInk Jet Printer
Colour cartridge showing inkjet nozzles
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Laser PrinterUse a laser beam and dry powered ink to
produce a fine quality print.
Used in schools and large businesses
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Soft Copy Output devicesSoft copy output cannot be “touched”
or feltVisual - Monitors/Visual Display Unit
Audio - Speakers
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A Cathode Ray Tube (CRT) monitor
A LCD monitor (Liquid Crystal Display)
Visual Display Units (VDU) or monitors are used to visually interface with the computer.
Visual Display Units display images and text which are made up of small blocks of coloured light called pixels (Picture Elements). The resolution of the screen improves as the number of pixels is increased.
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Speakers
Speakers output information in the form of sound waves. Computers may also use a sound card to allow for better quality sound.