printers
TRANSCRIPT
HARDCOPY OUTPUT DEVICES
OUTLINE: Hardcopy Output Devices
Printers Types of Printers
Impact Printers Nonimpact Printers
Dot Matrix Printers Working of Dot Matrix Printers Speed Quality
Inkjet Printers How does an inkjet printer work? Speed of inkjet printer Quality measures of inkjet printer
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OUTLINE: Laser Printers
Printing Process Speed of Laser Printer Quality measure of Laser Printer
All in One Peripherals Comparison of Printers High Quality Printers
Photo Printers Plotters
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HARDCOPY OUTPUT DEVICES: Hardcopy: Hardcopy output is tangible
and refers to output which is printed.
Softcopy Devices
Hardcopy Devices
Monitors Printer
Projectors Plotter
Speakers
Video Graphics Card
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PRINTERS An external hardware device responsible
for taking computer data and generating a hard copy of that data.
Printers are one of the most commonly used peripherals and they print text and still images on the paper.
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PRINTERS: The printer is computer output device
that accepts text and graphic as input, & prints or illustrations on paper as a hard copy in the form of documents etc.
Printing is a process for reproducing text and images typically with ink on paper.
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PRINTERS: (CONT.) Many printers are primarily used as local
peripherals, and are attached by a printer cable or, in most newer printers, a USB cable to a computer which serves as a document source.
In addition, a few modern printers can directly interface to electronic media such as memory card, or to image capture devices such as digital camera.
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TYPES OF PRINTER: Printers can fall into two categories:1. Impact printer: It produces text and images
when tiny wire pins on print head strike the ink ribbon by physically contacting the paper.
Examples: Dot matrix printer, Line printer, Daisy wheel printer, Band printer.
2. Non-impact printer: It produces text and graphics on paper without actually striking the paper.
Examples: Inkjet, Laser printer.
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IMPACT PRINTERS An impact printer
creates an image by using pins or hammers to press an inked ribbon against the paper.
Simplest impact printer is a type writer which uses small hammers embossed with characters or shapes
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DOT MATRIX PRINTERS Dot Matrix Printers are commonly used
in workplaces where physical impact with paper is important
A Dot matrix printer creates an image by using a mechanism called a print head, which contains a cluster or matrix of short pins
The more pins that a print head contains, the higher the resolution of the printers resolution
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DOT MATRIX PRINTERS CONT: The lowest-resolution dot matrix printers
have only nine pins The highest-resolution printers have 24
pins
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DOT MATRIX PRINTERS CONT: Speed of Dot matrix printer is measured
in characters per second (cps) The slowest dot matrix printers create
50 to 70 characters per second The fastest Dot matrix printers print
more than 500 characters per second
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OTHER IMPACT PRINTERS Line printers
Band Printers
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LINE PRINTERS A line printer is a special type of impact
printer IT uses a special wide print head that
can print an entire line of text at once Line printers have low resolution but are
incredibly fast It can print 3000 lines of text per minute
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BAND PRINTERS A Band printer features a rotating band
embossed with alphanumeric characters To print a character, the machine rotates
the band to the desired character, then a small hammer taps the band, pressing the character against a ribbon
Band printers can print 2000 lines of text per minute
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NON-IMPACT PRINTERS Non impact printers use other means to
create an image For example Inkjet printers spray paint
on the paper to create an image on the paper
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INKJET PRINTERS Ink jet printers create an image directly
on the paper by spraying ink through tiny nozzles
Ink jet printers are cheapest non impact printers
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INKJET PRINTERS CONT: Color ink jet printers have 4 ink nozzles
i-e Cyan (blue), Magenta (red), yellow and black
The colors are some times referred as CMYK
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LASER PRINTERS Laser printers are more expensive than
Inkjet printers, their print quality is higher
A CPU and memory is built into the printer to interpret the data and control the laser
The quality and speed of laser printers make them ideal for office environment
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LASER PRINTER CONT: Just as the electron
gun in a monitor can target any pixel, the laser in a laser printer can aim at any point on a drum, creating an electrical charge
Toner which is composed of tiny particles of ink, sticks to the drum in the places the laser has chargedSLIDES CREATED BY ENGR MUMTAZ ALI KALOI LECTURER COMPUTER SYSTEMS ENGINEEING SUKKUR IBA
LASER PRINTER CONT: Single color (Black) laser printers
typically can produce between 4 and 16 pages of text a minute
The most common laser printers have resolutions of 300 or 600 dpi, both horizontally and vertically
Some High-end models have resolutions of 1200 or 1800 dpi
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ALL-IN-ONE PERIPHERALS Several printer makers now use ink jet
or laser printers as the basis for all-in-one peripherals
These devices combine printing capabilities with scanning, photocopying and faxing etc
All-in-one peripherals are available in black and white and color models
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COMPARING PRINTERS Image Quality
Image quality, also known as printer resolution is usually measured in dots per inch (dpi)
More dots per inch a printer can produce the higher its image quality
SpeedPrinter speed is measured in the number of
pages per minute (ppm) the device can print
Speed of dot matrix printers is measured in characters per second (cps)
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COMPARING PRINTERS CONT: Initial Cost
The cost of new printers has fallen dramatically in recent years
It is possible to buy an average quality printer in few thousand rupees
Cost of OperationThe cost of ink or toner and maintenance
varies with the type of printer
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HIGH QULITY PRINTERS These printers are often used by
publishers and small print shops to create high quality output , especially color output
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PHOTO PRINTERS With digital cameras and scanners
becoming increasingly popular, users want to create photos instantly
Many photo printers use ink jet technology but a few use dye-sublimation technology
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PHOTO PRINTERS CONT: Photo printers work
slowly, some can take two to four minutes to create a printout
Several models create prints no larger than a standard 4 x 6-inch snapshot
Although newer photo printers can produce 8 x 10-inch or 11 x 14-inch prints
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PHOTO PRINTERS CONT: Many Larger-format photo printers can
print multiple images on a single sheet of paper
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PLOTTERS A device that draws
pictures on paper based on commands from a computer.
Plotters differ from printers in that they draw lines using a pen. As a result, they can produce continuous lines
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PLOTTERS CONT: Multicolor plotters use different-colored
pens to draw different colors.
Plotters were the first type of printer that could print with color and render graphics and full-size engineering drawings
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ANY QUESTION
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