Devices that Output Hard Copy
lesson 6
Devices that Output
Hard Copy
This lesson includes the following sections:
• Overview of Printers
• Dot Matrix Printers
• Ink Jet Printers
• Laser Printers
• Snapshot Printers
• Other High-Quality Printers
Overview of Printers
•
Categorizing Printers
•
Evaluating Printers
Overview of Printers - Categorizing Printers
Printers fall 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 methods to place
ink (or another substance) on the page.
Overview of Printers - Evaluating Printers
When evaluating printers, consider four 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 – Consumer printers cost $250 or less, but
professional printers can cost thousands of dollars.
•
Cost of operation – This refers to the cost of supplies
used by the printer.
Dot Matrix Printers
•
How Do Dot Matrix Printers Work?
•
Performance
Dot Matrix Printers How Do Dot Matrix Printers Work?
•
Dot matrix printers are a common type of impact
printer.
•
A dot matrix printer's print head contains a cluster
of pins. The printer can push the pins out to form
patterns 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
• How Do Ink Jet Printers Work?
• Performance
Ink Jet Printers –
How Do Ink Jet Printers Work?
• Ink jet printers are an example of non-impact
printers.
• The printer sprays tiny droplets of ink onto the paper.
• Ink jet printers are available for color and black-andwhite printing.
Ink Jet Printers - Performance
• Ink jet printers offer 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
•
How Do Laser Printers Work?
•
Performance
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-andwhite printing.
Laser Printers - Performance
• Laser printers provide resolutions from 300 – 1200
dpi and higher.
• Black-and-white laser printers usually produce 4 –
16 ppm.
• Laser printers produce higher-quality print than
ink jet printers, but are more expensive.
Snapshot Printers
•
Snapshot printers are specialized, small-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:
•
Thermal-wax
•
Dye-sublimation
•
Fiery
•
IRIS
•
Plotters
Plotters use mechanical, ink jet, or thermal technology
to create large-format images for architectural or
engineering uses.
lesson 6 Review
•
List the three most commonly used types of printers.
•
List the four criteria you should consider when
evaluating printers.
•
Describe how a dot matrix printer creates an image
on a page.
•
Explain the process by which a laser printer
operates.
•
List five types of high-quality printing devices
commonly used in business.
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