Laser printers

1. Introduction
2. History
3. Basic components of Laser printer
4. Laser Printing process
5. Advantages
6. Disadvantages
7. Application
8. Latest laser Printers
9. Conclusion

1. Laser Printer Abhijit H Jadhav (Roll no 02 )

2. Overview Introduction History Basic Components Laser Printing process Advantages Disadvantages Applications Latest laser printers Bibliography

3. Introduction Printers are classified into Impact and non impact printers. LASER stands for Light Amplification by Stimulated Emission of Radiation. Laser printers uses electrostatic printing process. Laser printers are used to produce high quality images and graphics. It is a type of printer that utilizes a laser beam to produce an image on drum. It uses a non-impact (keys don't strike the paper), photocopier technology.

4. History Laser printer invented by Gray Starkweather at in 1969 when American Xerox Corporation held a dominant position in the copier market In 1960. Commercially IBM introduced the first laser printer in 1975 to use it with its mainframe computers. In 1984, Hewlett-Packard ( HP ) revolutionized laser-printing technology with its first LaserJet, a compact, fast, and reliable printer that personal computer users could afford. Gray Starkweather

5. Basic Components

6. Laser Printing Process Cleaning: Before a new page is printed, any remaining from the previous page are cleared away. The drum is swept free with a rubber blade, and a fluorescent lamp removes any electrical charge remaining on the drum. Conditioning: The entire drum is uniformly charged by the primary corona wire. This charge conditions the drum for the next step.

7. Writing: The laser printer controller uses a laser beam and a series of mirrors to create the image of the page on the drum. The laser beam is turned on and off in accordance with the image to be created on the drum. Developing: A magnet inside the developing roller attracts the iron particles in the toner. This roller rotates near the drum and the toner is attracted to the areas of the drum that have been exposed by the laser, creating the print image on the drum. (Toner : the electrostatic image is created by changing the charges on different places. The drum continues to revolve and the toner sticks to the negatively charged places of the text.)

8. Transferring: A magnet inside the developing roller attracts the iron particles in the toner. This roller rotates near the drum and the toner is attracted to the areas of the drum that have been exposed by the laser, creating the print image on the drum. Fusing: The fusing rollers apply heat and pressure to the toner, which melts and presses it into the paper to create a permanent bond. The rollers are covered with Teflon and treated with a light silicon oil to keep the paper from sticking to them.

9. Advantages It is a very fast printer. The printing cost of laser printer is less than inkjet printer. It has the ability to print the high resolution images that is 1200 dpi consuming less time. It makes no noise during printing process. Their maintenance time span is longer (changing of the toner) Its efficiency is very high.

10. Disadvantages It is very expensive. The maintenance cost is high. Very Bulky and difficult to repair. It has health hazards.(gases like ozone, nitrogen oxide, carbon monoxide are emitted which are harmful for health.) Also emit Ultraviolet radiation that can cause eye damage.

11. Applications For taking huge printout. For hoardings and banner printings. For taking light fast printouts. For printing books, newspapers etc in huge industries.

12. Latest Laser printers (2016) 40 Pages per minute. Maximum storage memory 512 MB. Toner capacity of printing 5000 pages. Capacity of printing 2400 dpi . Wireless printing. Photo printing. 32 Pages per minute. Maximum storage memory 128 MB. Toner capacity of printing 4200 pages. Capacity of printing 2400 dpi . Wireless printing.   XEROX COLORQUBE 8570DN   BROTHER HL-L8350CDW

13. Bibliography https://en.wikipedia.org/wiki/Laser_printing#Color_laser_printers http://www.sqa.org.uk/e-learning/HardOSEss03CD/ http://www.brainbell.com/tutors/A+/Hardware/Primary_Components_of_a_Laser_Printer http://computer.howstuffworks.com/laser-printer1.htm http://www.global-b2b-network.com/direct/dbimage/50334056/Toner_Cartridge