Core Hardware: Lecture 8
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This document discusses different types of printers. It outlines impact printers like daisy wheel and dot matrix printers. Daisy wheel printers use a print wheel with raised characters that impact against paper to print. Dot matrix printers use a matrix of pins to form characters as patterns of dots. The document also discusses non-impact printers like laser, inkjet, and thermal printers. Laser printers use electro photography to fuse toner onto paper using heat. Inkjet printers spray tiny droplets of ink to form characters. Thermal printers use heated pins to darken heat-sensitive paper.
![Inkjet Printer Cont.….
• Advantages of Ink jet Printers
• High quality text and graphics.
• Produces no noise
• Disadvantages of Thermal Printers
• Its speed is slow than other impact printer and no- impact printers.
• Its image quality is also lower than other printer [low dpi (dot per
inch) , bout 180 dpi].
• Ink cartridge is costly.](https://image.slidesharecdn.com/lecture8-211111100510/85/Core-Hardware-Lecture-8-15-320.jpg)
Core Hardware: Lecture 8
- 1. Lecture 8
- 2. Outline • Printer • Types of printer
- 3. Printer • A printer is an electronic output device which is used to accept data from computer and make hard copies on physical means such as texts and graphics on paper. • Printer has two main categories. • Impact • Non-impact
- 4. Impact printers • Impact printers these Printers use an Electro-mechanical mechanism. An impact printer refers to all those printers whose printing heads touch the paper. This mechanism uses hammers or pins to strike against a ribbon and paper to print the text or image. • Impact printers are further categorized into: • Character Printer • Line Printer
- 5. Character Printer • A Character printer prints a single character at a time. They are low speed printers. Their printing speed lies in the range of 10-600 character / second. • Character printer types: • Daisy Wheel Printer • Dot Matrix Printer
- 6. Daisy Wheel Printer • Also known as Letter Quality Printer. These printers use a print wheel font, which is termed as daisy wheel. Each petal or hammer of Daisy-Wheel has a character raised on it. A motor spins the wheel at a rapid rate. When the desired character spins to the correct position, a print hammer strikes it to produce the output. • These printers are most commonly used in electronic typewriter.
- 7. Daisy Wheel Printer Cont… • Advantages of a Daisy-Wheel Printer • Can print letter quality characters. • Gives fine quality output. • Disadvantages of a Daisy-Wheel Printer • Printing speed is very slow • Noisy • Cannot print Graphics • They are very costly.
- 8. DOT MATRIX PRINTER • These printers print each character as a pattern of dots. The print head is made up of a matrix of tiny needles, typically 9 rows with 7 columns (9 *7 matrix needles). These shapes of each character are formed in the form of tiny dots. The printing quality of a dot matrix printer is inferior to a daisy wheel printer. But the printing speed of a Dot Matrix Printer is range from 40 to 600 characters per second. Dot Matrix Printers are less expensive than daisy – wheel printer. The main advantage of dot matrix printer over latter – quality printer is that dot – matrix printer can print characters in different shape, size and fonts. It has ability to print charts and graphics.
- 9. DOT MATRIX PRINTER Cont… • Advantages of a dot matrix printer • Dot matrix printer uses continuous paper rather than requiring individual sheet. • Dot matrix printer is fast and cheep. • Dot matrix printer can print charts and graphics. • Disadvantages of a dot matrix printer • Dot matrix printers are noisy. • Dot matrix printers do not produce high quality.
- 10. LINE PRINTERS • Line printers are impact printers used with mini and mainframe computers. For producing large volume outputs. These printers print one line of the text at a time that is why known as line printer. Its printing speed lies in the range of 300-3000 lines per minute (LPM). Actually line printer prints only one character at a time but because of its printing speed, observer observes that it prints a whole line a time. • Liner Printer types • Drum Printer • Chain Printer
- 11. NON -IMPACT PRINTER • These printer uses ink and special electrical machines for producing outputs. Non – impact printers are all those printers whose printing heads do not touch paper. A non impact printer forms characters and image on a piece of paper without actually striking the paper. • Types of Non-Impact Printer • Laser • Inkjet • Thermal
- 12. Laser Printer • They print one page at a time thus laser printer is also referred as Page Printer. • A laser printer uses electronics, lasers, xerography and other techniques, which is called electro photographic technique. • A laser beam is directed across the surface of a light or photosensitive drum. An image is produced, with the use of raster scan principal, in the form of tiny dots. • The laser exposed areas attract toner (or ink power). There after the drum transfers the toner to the paper. The paper then moves to a fusing station where the toner is permanently fused on the paper with heat or pressure. After this the drum is discharged and cleaned and ready for processing the next page.
- 13. Laser Printer Cont… • Advantages of Laser Printers • Very high speed . • Low noise level • Low maintenance requirement. • Very high quality output on ordinary paper. • Good graphics quality (300 dpi to 1200 dpi) and excellent graphics capabilities. • Supports many fonts and different character size. • Color printing possible • Disadvantages of Laser Printers • Very Expensive. • Require periodic maintenance. •
- 14. Inkjet Printer • Inkjet printer uses the dot matrix approach to print to print text and graphics. However the dots are formed by tiny droplets of ink. They print characters by spraying small drops of ink onto paper. • For spraying drops nozzles are used. • Special type of ink having high iron content is used for forming drops. • Droplets of ink are electrically charged after leaving a nozzle when it passes through a valve. • The droplets are then guided to the proper position on the paper by electrically charged horizontally and vertically deflection plates. • These printers can print 40-300 CPS (character/sec.) and can produce multi-color printouts.
- 15. Inkjet Printer Cont.…. • Advantages of Ink jet Printers • High quality text and graphics. • Produces no noise • Disadvantages of Thermal Printers • Its speed is slow than other impact printer and no- impact printers. • Its image quality is also lower than other printer [low dpi (dot per inch) , bout 180 dpi]. • Ink cartridge is costly.
- 16. THERMAL PRINTER • The printer that produces images by pushing electrically heated pins against special heat – sensitive paper, is known as thermal printer. • This type of printer uses a special heat sensitive paper. These papers have a special heat sensitive coating. • When a spot on the special paper is heated, it becomes dark. A character is printed with a matrix of dots. • The heating element is heated by electric current. We can also say the heat sensitive paper as chemically treated paper. In this type of printer neither the ink nor the ribbon is involved. Such printers have a speed of about 200 characters per second.
- 17. THERMAL PRINTER Cont.…. • Advantages of Thermal Printers • Low noise • Can produce high quality color output. • Disadvantages of Thermal Printers • Expensive • Slow Speed • Required special paper