Mr. Pakman Blog

How Laser Printer Works

1. Raster image processing
each horizontal line of dots to be printed on a page called lines Raster will be sent in one of the printer language (such as Adobe Photo script) and modified by the Raster Image Processor of the Printer into bitmap and stored in the Raster memory. The process occurs when you press print button on your PC.

2. Charging
a sensitive print drum which continues to rotate and have been loaded previously will refract electrostatic particles on the surface of the receptor.

3. Writing
laser is shot toward a series of mirror and lens onto the photo receptor. Raster data in memory will notify when the laser must be active or inactive. Laser will change the particles on the photo receptor.

4. Expansion
then the photo receptor will be presented with the toner (which has a negative electric charge) and drawn to the photo receptor where the laser reverses the electric charge (opposite electric charge will attract each other).

5. Transferring/Printing
photo receptor is then forwarded on a paper that has given a stronger positive electric charge then the surface of photo receptor, so that the tuner will be extracted to make a printed page by cartridges toners available for yellow, magenta, cyan and black (Monochrome laser usually use black toner only and monochrome text printing is faster than the color graphical printing).

6. Thawing
paper is then wedged between two rollers, the heating roller and the press roller, to thaw toner on the paper. Fuser will absorb most of the energy and cause the printed paper to be so warm.

7. Cleaning
after the page is printed, thin plastic sheet will clean the excess toner on the photo receptor and send it to disposal. In addition, a lamp will also neutralize the remaining electric charge in the photo receptor.