Bannk.com the place for Cheap Printer Inkjet Cartridges Presents:
'How Laser Printer Works (summary)'

Printer Inkjet Cartridges - Home > Learn More about Printers > How Laser Printer Works (summary)


----------------------------------------------------------
Parts or the Whole Content is From:
Printer and Photocopier Troubleshooting and Repair Collection
Version 2.48
Copyright © 1996-2001
Samuel M. Goldwasser
--- All Rights Reserved ---
For corrections/comments/suggestions, please contact me via the Sci.Electronics.Repair FAQ Email Links Page.
Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied:
1. This notice is included in its entirety at the beginning.
2. There is no charge except to cover the costs of copying.
----------------------------------------------------------


How Laser Printer Works (summary)


In general the principle of electrostatic laser printing is as follows:

  1. Charging a photoconductive selenium (or other) coated drum.

  2. Discharging the drum with the laser steering engine in accordance with the input image rasterized pattern. (the laser is modulated to generate a predefined pixel pattern on the face of the drum - the focal plane).

  3. The rotating drum attracts toner to the charged pattern (latent image) generated by the laser.

Epson Complete Guide to Digital Printing Two-page spreads with write-ups and pictures from acclaimed expert photographers George Lepp, John Shaw, Greg Gorman, Jack Reznicki, Joyce Tenneson, and others explain how Epson printers and digital photography have enhanced their art and expanded their business. There's advice on deciding which printer is right for you, selecting standard and specialty papers, using image-processing programs to refine photos, adding finishing touches that turn a good print into a great one, and much more. If you've gone digital, you can't do without this! Read more...

  • The toner is transfered from the drum to the moving papaer to generate a full image.

  • The paper carrying the toner moves through the heater to fuse the toner to a fine non-erasable image.

    • The laser steering engine is combined of the following components:

    • Infra-red diode laser, 3 to 4 mW in basic units, up to 30 mW or more for high performance printers.

    • Beam expander to form the required size of the collimated input beam which generates the beam spot size in the focal plan.

    • Cylindrical lens to reshape the laser elliptical beam to a round one.

    • Spinning polygonal mirror to deflect the laser over the focal plan.

    • F-Theta lens to flatten the inherent circular plan of a rotating mirror. This lens is a very special lens which only few in the optical community know how to design and fabricate. The one that you own is particularly special because it is a Sectioned F-Theta lens which are typicaly more expensive (most of them are spherical).

      If you need to scan or to print in high resolution 500 dpi or higher, you end up using a glass F-Theta lens.



    Other Related Articles:
    Cleaning and Handling of Photosensitive Drums
    Laser Diodes in Laser Printers
    Types of toner
    If I put wrong type of toner
    How Dot Matrix Printer Works
    How Daisy Wheel Printer Works
    How Inkjet Printer Works
    How Laser Printer and Photocopier Works
    Primer Basics