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Lecture 6
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Transcript

  • 1. Output Devices
  • 2. Output Devices • Devices on which we obtain information out from the computer. • Many O/P devices, some of them are as follows- • Printer • Plotter • Monitor • Synthesizer
  • 3. Printers A printer, produces a hard copy of documents stored in electronic form, on physical print media such as paper or transparencies. Printers can be classified into following categories: • Classification A (text printed at a time) 1. Line Printer 2. Page Printer • Classification B (quality of print out ) 1. Dot Matrix Printer 2. Inkjet Printer 3. Laser Printer • Classification C (head contact) 1. Impact Printer 2. Non-impact Printer
  • 4. Line Printer • The Line Printer is a form of high speed impact printer in which one line is printed at a time. Print speeds of 600 to 1200 lines-per-minute approximately. • The disadvantages of line printers are that they cannot print graphics, the print quality is low, and they are very noisy. • There are following types of Line Printers :- 1. Drum Printer 2. Chain Printer 3. Bar Printer 4. Comb Printer
  • 5. Drum Printer • An impact printer. • Consists of a cylindrical drum. • A fixed font character set is fixed on its surface. • One complete set of characters is embossed for each and every print position on the line. • The wheels, joined to form a large drum, spin at high speed and paper & an inked ribbon are moved to the print position. • As the desired character for each column passes the print position, a hammer strikes the paper from the rear and presses the paper against the ribbon and the drum, causing the desired character to be recorded on the continuous paper.
  • 6. Chain Printer • It contains a steel band on which the character sets are embossed. • 4 sets of 64 characters are embossed on the band. • For printing a line, all the characters in the line are sent from memory to printer buffer. • As the band rotates at high speed, hammer is activated. • Hammer’s movement and chain movement should be synchronised. • Chain of the printer can be changed to use different fonts using the same printer.
  • 7. Serial Printer • A printer that uses a serial port for connection to the computer. • A printer that prints one character at a time, such as a dot matrix printer. • Also known as character printer. • These are slow printers. There are many types of serial printers – • Dot Matrix Printer: • The most popular impact character printer. • The print head consists of pins. • Characters to be printed are sent one character at a time from memory to printer. • The character code is decoded by the printer electronics and activates the appropriate pins in print head. • The printer prints the characters as a pattern of dots. • The pins are moved forward to form a character and they hit the carbon ribbon in front of the paper to print the character. • Print Quality is lesser. • Less expensive.
  • 8. Serial Printer 1. Inkjet Printer: • Non-impact character printer. • Print characters by spraying ink onto the paper. • Special type of ink having iron content used. • Drops of ink are electronically charged after leaving a nozzle. • These drops are then guided to proper position on the paper by electrically charged deflection plates. • Produce higher quality O/P. • Colour printing is also possible. 2. Laser Printer: • Very high speed non-impact printer. • Also known as Page Printer. • An electronically controlled laser beam traces out the desired character to be printed on a photoconductive drum. • The drum attracts an ink toner on the exposed areas. • This image is transferred to the paper which comes in the contact with drum. • Comparatively expensive.
  • 9. Serial Printer
  • 10. Plotters An output device, used to produce hard copies of graphs and designs. These are of two types – • Drum Plotter: • The paper on which the design has to be produced is placed over a drum that rotates back and forth to produce vertical motion. • Contains pen(s) clamped in holder(s) to produce horizontal motion. • Drum and pens move simultaneously. • Different coloured pens are used to produce multi-coloured designs. 4. Flatbed Plotter: • A plotter where the paper is fixed on a flat surface and pens are moved to draw the image. • This plotter can use several different colour pens to draw with. • Has a stationary horizontal plotting surface on which paper is fixed. • Pen is mounted on a carriage which can move in either X or Y directions. • Pen can move up and down. • Used to trace graphs.
  • 11. Plotters
  • 12. Monitor • A monitor is a piece of electrical equipment which displays viewable images generated by a computer without producing a permanent record. • Similar to television screen. • Monitor output is softcopy. • Monochrome and Colour Monitors:  VGA (Video Graphics Array)  SVGA (Super Video Graphics Array/Adaptor)  EGA (Enhanced Graphics Adapter)  CGA (Colour Graphics Adapter) • Image consists of small dots known as pixels. • More pixels give clearer image i.e. better display. • Types of monitors used in PCs and laptops:  Cathode Ray Tube (CRT)  Flat Panel Display:  Liquid Crystal Display (LCD)  Electro Luminescent (EL)  Gas Plasma (GP)  TFT (Thin-film Transistor)
  • 13. Monitor
  • 14. Audio Output • Audio output is the second type of softcopy. • In order to have high quality, sound card as well as good speakers are required. • Computer speakers or multimedia speakers are equipped with a low-power internal amplifier . • Computer speakers range widely in quality and in price. • Generally speakers with computer systems, are small plastic boxes with dull sound quality. • Internal speakers are also available in the computer market. • Some of the slightly better computer speakers have equalization features such as bass controls, improving their sound quality somewhat.
  • 15. Audio Output