2.  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

3.  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

4.  Hardcopy: Hardcopy output is tangible and
refers to output which is printed.
Softcopy Devices Hardcopy
Devices
Monitors Printer
Projectors Plotter
Speakers
Video Graphics Card

5.  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.

6.  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.

7.  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.

8.  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.

9.  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

10.  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

11.  The lowest-resolution dot matrix printers
have only nine pins
 The highest-resolution printers have 24 pins

12.  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

13. Line printers
Band Printers

14.  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

15.  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

16.  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

17.  Ink jet printers create an image directly on
the paper by spraying ink through tiny
nozzles
 Ink jet printers are cheapest non impact
printers

18.  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

19.  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

20.  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
charged

21.  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

22.  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

23.  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
 Speed
 Printer 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)

24.  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 Operation
 The cost of ink or toner and maintenance varies
with the type of printer

25.  These printers are often used by publishers
and small print shops to create high quality
output , especially color output

26.  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

27.  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

28.  Many Larger-format photo printers can
print multiple images on a single sheet of
paper

29.  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

30.  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