Overview of Printers

•Categorizing Printers

•Evaluating Printers

Overview of Printers – Categorizing Printers

Printers fal into two categories:

• Impact printers use a device to strike an inked
ribbon, pressing ink from the ribbon onto the paper.

• Non-impact printers use different methodstoplace
ink (or another substance) on the page.

Overview of Printers – Evaluating Printers

When evaluating printers, considerfour criteria:

•Image quality – Measured in dots per inch (dpi). Most
printers produce 300 – 600 dpi.

•Speed – Measured in pages per minute (ppm) or
characters per second (cps).

•Initial cost – Consumerprinters cost $250 or less, but
profesional printers can cost thousands of dolars.

•Cost of operation – This refers to the cost of supplies
used by the printer.

Dot Matrix Printers
Dot Matrix Printers – How Do Dot Matrix Printers Work?

•Dot matrix printers are a common type of impact

•A dot matrix printer’s print head contains a cluster
of pins. The printer can push the pins out to form
paterns in rapid sequence.

•The pins press an inked ribbon against the paper,
creating an image.

Dot Matrix Printers – Performance

• Lower-resolution dot matrix printers use nine pins.
Higher-resolution models have 24 pins.

• Speed is measured in characters per second (cps).
Some dot matrix printers print 500 cps.

Ink Jet Printers

Ink Jet Printers –How Do Ink Jet Printers Work?

• Ink jet printers are an example of non-impact

• The printer sprays tiny droplets of ink onto the

• Ink jet printers are available for color and black-and-
white printing.

Ink Jet Printers – Performance

• Ink jet printers ofer speeds of (2 –4 pages per
minute ppm) and resolution (300 – 600 dots per
inch dpi),comparable to low-end laser printers.

• Ink jet printers are inexpensive and have low
operating costs.

Laser Printers

Laser Printers –How Do Laser Printers Work?

•Laser printers are non-impact printers.

•They use heat and pressure to bond particles of
toner to paper.

•Laser printers are available for color and black-
and-white printing.

Laser Printers – Performance

• Laser printers provide resolutions from 300 – 1200
dpi and higher.

• Black-and-white laser printers usualy produce 4 –
16 ppm.

• Laser printers produce higher-quality print than
ink jet printers, but are more expensive.

Snapshot Printers

•Snapshot printers are specialized, smal-format
printers that print digital photographs.

•Snapshot printers are fairly slow, and can be more
expensive to operate

•Snapshot printers are popular among digital camera users

Other High-Quality Printers

Print shops and publishers use these printers to create
high-quality color images:







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