How do Laser Printers Work?

It is one of those things that most of us really don’t think about. How does a laser printer work? Well, you click “print” and it works, right? For most of us that is all we need to know or would care to know. But, in reality, it is something you should an understanding of if you are going to be buying a laser printer for the office network or shelling out a decent amount of cash.

Chemistry isn’t that bad

Most people have horror stories about chemistry class, me included. But when it comes to figuring out how a laser printer and chemistry work together it is not all that bad. Whether it is a hp, Epson or Cannon laser printer it works the same way, positive charges and negative charges. The old saying actually applies, opposites attract.

Getting charged

Within the laser printer there is a drum that slowly turns. As it turns it is given a charge by a wire (charge corona wire) or, in some cases, another roller. After the drum is charged the printer shoots a laser at the surface of the drum discharging the drum in certain places. These places end up looking like letters and numbers on the drum.

To get these discharged letters and number shapes off the drum and onto a piece of paper the laser printer covers the discharged shapes with charged toner. It then hooks them up with an oppositely charged piece of paper. As makes sense the toner is attracted to the paper and there it is, toner on paper. If you have ever changed a toner cartridge you can attest that the stuff loves to attach itself to just about anything. The process so far just makes the toner attach itself in an ordered fashion or letter and numbers.

Getting tonedThe process is just about complete at the most basic level. What needs to happen to finish off the process is for the toner to be fused into the paper permanently. To accomplish this the laser printer rolls the paper by a heat roller to melt the toner into the fibers of the paper. As the laser printer does this it real eases the charge with yet another roller. Ultimately, when the process is in synch there is no muss and no mess. But everything needs to be timed just right. In the end, there is a warm static free piece of paper with all the words fit and unfit to print.

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How do Laser Printers Work?

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