Lecture 11-12

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