1. Computer Applications to Business
Lecture 11-12
Printing

2. Commonly Used Printers
Printer can be categorize into two categories:
Impact printers
Non-impact printers

3. 1) Impact printers
Creates an image by using pins or hammers to press an inked ribbon against the paper.
Generate output by striking the paper
Uses an inked ribbon
For example ; type writer
The most common type of impact printer is the dot matrix printer
Other types of impact printers are line printers and band printers.

4. 2) Non-impact printers Other means to create an image.
Ink jet printers, for example, use tiny nozzles to spray droplets of ink onto the page.
Laser printers work like photocopiers, using heat to bond microscopic particles of dry toner to specific parts of the page.
Use methods other than force
Tend to be quiet and fast

5. Commonly Used Printers
Dot matrix printers
Impact printer
Commonly used in workplaces where physical impact with the paper is important.
When the user is printing to carbon copy or pressure sensitive forms.
Used to print to multi-sheet pages
Print head (contains a cluster or matrix of short pins arranged in one or more columns) strikes inked ribbon.

6. Dot matrix printers
The more pins that a print head contains, the higher the printer’s resolution.
The lowest-resolution dot matrix printers have only nine pins;
The highest-resolution printers have 24 pins.
The slowest dot matrix printers create 50 to 70 characters per second;
the fastest print more than 500 cps.
Not commonly used in homes,
Still widely used in business.

7. Dot Matrix Print Head

8. Dot matrix printers

9. Commonly Used Printers
Other types of impact printers:
Line printers
Uses a special wide print head that can print an entire line of text at one time.
Line printers do not offer high resolution but are incredibly fast.
The fastest can print 3,000 lines of text per minute.

10. Commonly Used Printers
Other types of impact printers:
Band printers
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.
Can generate 2,000 lines of text per minute

11. Commonly Used Printers
Ink-jet printers
Non-impact printer
Inexpensive home printer
create an image directly on the paper by spraying ink through tiny nozzles.
attain print resolutions of at least 300 dots per inch.
When used with special printing paper, many ink jet printers can produce photo-quality images.
Color output common using CMYK
Cyan, magenta, yellow, black
Sprays ink onto paper

12. Commonly Used Printers--Ink-jet printers

13. Dots Per Inch

14. Commonly Used Printers--Non-impact printer
Laser printer
Non-impact printer.
Produces high quality documents.
Color or black and white.
A CPU and memory are built into the printer to interpret the data that it receives from the computer and to control the laser.
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.

15. Commonly Used Printers--Non-impact printer
Laser printer
Print process
Laser draws text on page
Toner sticks to text
Toner melted to page
Speed measured in pages per minute (PPM)
Quality expressed as dots per inch(DPI)

16. Commonly Used Printers
Laser printer: Printing process

17. Commonly Used Printers
Laser printer: Printing process

18. Commonly Used Printers
All-in-one peripherals
Scanner, copier, printer and fax
Popular in home offices
Prices are very reasonable

19. Comparing Printers Determine what you can spend Initial cost
Cost of operating
Image quality
Also known as print resolution, is usually measured in dots per inch (dpi).
Speed
Printer speed is measured in the number of pages per minute (ppm) the device can print.
Most consumer-level laser printers offer print speeds of 6 or 8 ppm,
But high-volume professional laser printers can exceed 50 ppm.

20. High-Quality Printers
Special purpose printers
Used by a print shop
Output is professional grade
Prints to a variety of surfaces

21. High-Quality Printers
Photo printers
Thermal wax printers
Dye sublimation printers
Plotters

22. High-Quality Printers
Photo printers
Produces film quality pictures
Prints very slow
Prints a variety of sizes
Many larger-format photo printers can print multiple images on a single sheet of paper

23. High-Quality Printers
Thermal wax printers
Used primarily for presentation graphics and handouts.
Create bold colors and have a low per-page cost for printouts with heavy color requirements, such as posters or book covers.

24. High-Quality Printers
Thermal wax printers
Color generated by melting wax.
Colors do not bleed.
Operation costs are low.
Output is slow.

25. High-Quality Printers
Dye sublimation printers
A ribbon containing panels of color is moved across a focused heat source capable of subtle temperature variations.
The heated dyes evaporate from the ribbon and diffuse on specially coated paper or another material, where they form areas of different colors.
Produces realistic output

26. High-Quality Printers
Dye sublimation printers
Very high quality
Color is produced by evaporating ink
Operation costs are high
Output is very slow

27. High-Quality Printers
Plotters
A plotter is a special kind of output device.
Used to print large-formal images , such as construction drawings created by an architect.
Large high quality images
Older models draw with pens
Operational costs are low
Output is very slow