Download - OUTPUT DEVICES OF INFORMATION SYSTEM 25 JULY 2005 LOWER 6 TH COMPUTING LESSON Prepared by:T.Fina
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OUTPUT DEVICES OF INFORMATION SYSTEM
25 JULY 2005
LOWER 6TH COMPUTING LESSON
Prepared by:T.Fina
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PRINTER
Printer is used to print input document as
output display.
Types of PRINTERS: -
(1) DOT MATRIX PRINTER
(2) INK JET PRINTER
(3) LASER PRINTER
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DOT MATRIX PRINTER
• Often used with PCs.• It is an impact printer which produce its image by striking
the paper through a ribbon.• Its print head consists of small pins, varying between 9
and 24 depending on the manufacture.• A 24 pin print head will produce a better quality of print
than a 9 pin print head because the dots are closer together.
• Dot matrix printer is extremely versatile with most of them able to print in condensed, standard and enlarged mode in bold or normal print.
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INK JET PRINTER
• Ink Jet printer is a popular type of non-impact printer.
• A popular colour inkjet printer such as Hewlett Packard’s DeskJet 660C.
• They are compact and quiet and offer resolution almost as good as a laser printer.
• However, they are slow in operation; a complex combination of text and colour can take up to 8 minutes for a single sheet.
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LASER PRINTER
• Laser printer is becoming increasingly popular and suitable for desktop publishing applications.
• Laser printer use a process similar to a photocopying machine, with toner (powdered ink) being transferred to the page and then fused onto it by heat and pressure.
• A laser printer produces output of very high quality at a typical speed in the region of 10 pages per minute and is virtually silent in operation.
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COM (COMPUTER OUTPUT TO MICROFILM)
• Where images are recorded onto photographic film which can then be stored and read by a special reader.
• Many different types of film are used including 16 mm and 35 mm rolls of cartridge film, with each roll capable of holding over 3000 pages of computer printout.
• Microfilm sheets also known as ‘microfiche’ which can be used to hold between 80-22- pages of information per sheet.
• ADVANTAGES- Very fast with over 100,000 cps achieved by some microfilmers.- Cheap and copies can be made easily- Very compact
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SCREEN
• Also called as the monitor, CRT (cathode ray tube) or VDU (visual display unit) and is an important output device.
• The most widely used screens are generally in size of 13 inch or 15 inch TV screen and in ‘character mode’ display 80 characters on a line with a maximum of 25 lines.
• Larger A4 size screens are available and are particularly useful for desktop publishing allowing the user to see a whole page on the screen.
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LIQUID CRYSTAL DISPLAY
• Is used on laptop computers where weight and size have to be kept to a minimum.
• They are now available in high resolution and colour, giving a display comparable to a regular CRT display.
• The viewing angle is however more limited.
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PLOTTER
• A plotter is an output device used to produce high quality line drawings such as building plans or electronic circuits.
• They are generally classified as pen (vector plotter) or penless (raster plotters).
• Pen plotters are low in price and hold a large share of the plotter market.
• Penless plotters include electrostatic plotters, thermal plotters and laser plotters they are used where drawings of high densities are required for example drawings of machines printed circuit boards or maps.
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YOUR TASKS
• Find the pictures of every output devices in today’s lesson. And send it by e-mail it to me at this address: [email protected]
and submit TODAY.
THANK YOUR FOR YOUR ATTENTION