Printers

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

SLIDES CREATED BY ENGR MUMTAZ ALI KALOI LECTURER COMPUTER SYSTEMS ENGINEEING SUKKUR IBA

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


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


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.


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.


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.


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.


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


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


DOT MATRIX PRINTERS CONT: The lowest-resolution dot matrix printers

have only nine pins The highest-resolution printers have 24

pins


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


http://en.wikipedia.org/wiki/Image:Dot_matrix_example_text.png

OTHER IMPACT PRINTERS Line printers

Band Printers


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


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


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


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


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


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


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


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


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)


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


HIGH QULITY PRINTERS These printers are often used by

publishers and small print shops to create high quality output , especially color output


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


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


PHOTO PRINTERS CONT: Many Larger-format photo printers can

print multiple images on a single sheet of paper


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


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


ANY QUESTION

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Printers

Engineering

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