Computer Laser Printer

                             Computer Laser Printer

 

Laser printing is an electrostatic digital printing process that rapidly produces high quality text and graphics by passing a laser beam over a charged drum to define a differentially charged image. The drum then selectively collects charged toner and transfers the image to paper, which is then heated to permanently fix the image. As with digital photocopiers and multifunction printers (MFPs), laser printers employ a xerographic printing process, but differ from analog photocopiers in that the image is produced by the direct scanning of the medium across the printer's photoreceptor. Hence, it proves to be a much faster process compared to the latter.

Printing Process

1. The Cleaning phase cleans up the work from the previous page to prepare the Drum for printing a new page.

2. The second phase involves the Primary Corona wire. Primary meaning “first” is the first of two Coronas being used. The Primary Corona applies a uniform negative charge to the Drum.

3. Next, the Laser writes an electrical representation on the Drum of the image that will be printed.

4. During the Developing phase, Toner is applied electrically to the areas on the Drum that were written by the Laser.

5. Next, the Paper becomes part of the process. The Transfer Corona wire applies a positive charge to the Paper that pulls the negative charged Toner onto the Paper.

6. Finally, during the Fusing phase, the heat and pressure rollers melt the Toner particles into the Paper. The printed paper will be temporarily warm to the touch as the result of the Fusing phase.

These 6 phases are repeated for every page that is printed.

The magic remains, but the process is understood.

 

See The Below Video To Understand The Printing Process Briefly: