The technology in printing industry has advanced in leaps and bounds. There were days of type writers and then came the days a bulky and noise making Dot Matrix printers, which were slow and consumed a lot of ink and office supplies. Then came the inkjet technology, they were noisy and the resolution was not so high, even they were high on utilizing office supplies.

And now comes the age of high resolution, compact and not at all noisy Laser Printers. Ever wondered how it works, how a laser would print your document.

The following is a brief description of the technology and its advantages:

• Laser printers utilizes the laser and xerography technology which is not only of high resolution but extremely accurate to. These printers utilize charged plates behind which a toner of the same charge is spread. These charged placed are struck by the laser very fast to create an impression of the letter to be printed. The laser printer is made up of an electric circuit, a corona wire capable of generating high voltage, a photo receptor drum and a laser along with the ink roller.

• Firstly the computer converts the data in the document to be printed into electrical signals and is passed on to the electric circuit of the printer. This electric circuit passes it on to the corona wire located near the photo receptor drum and the ink roller. The corona wire generates high voltages and charges the photoreceptor with a positive charge. At the same time the circuit activates the laser, and instills it with the data to be printed.

• Thus the laser is fired on to a mirror which keeps on moving, which allows the laser to bounce to the photo receptor drum. As both of them are oppositely charged, the drum shrugs off its positive charge and with the negative charge, creates an image of the data to be printed. The data which is on the receptor is negatively charged while the rest of the drum is still positively charged. Now the ink roller is also positively charged so no ink is spread on the positively charged part of the drum, but ink attracts only the negatively charged part. Thus the ink sticks to the drum and then is passed on to the rolling paper.

• While the paper is moving, it is positively charged so it also attracts the negatively charged ink on it paper and the impression is formed on the paper. The ink particles are just resting on the paper for the time being. The paper then passes through two hot rollers to dry the ink and provide you with the hard copy of the document. After passing through the rollers the paper get hot and come out amazingly fresh and completes the printing process.

The laser printers have a maximum resolution of 1200 dpi which is very high. There is no excessive spill of ink ad there speed of printing is very high. There cost of supplies that is ink is very low. As time and technology come by the laser printers will evolve and shall shrug off their image as expensive printers.