How laser printer prints / transfer the output on the paper?

How laser printer prints / transfer the output on the paper?

Laser Printers are similar to photocopiers and works on the alike basic technology. Your computer sends a stream of electronic data (numbers of bits) to your laser printer when you give the print command.

An electronic circuit in the printer mapped the data and make arrangements that what it needs to look like on page. It makes a pattern of static electricity to scan back and forward a laser beam on a drum inside printer. Powdered ink called toner is attracted by static electricity on the page, as in a photocopier a fuser unit bonds the toner to the paper.

orona wires are activated by the electronic circuit. It is actually a high voltage wire that statically charged the objects placed near to it. This wire charges the drum of photoreceptor, so that the drum gets positively charged. That charge is distributed on the surface of drum uniformly.

Circuit activities the laser simultaneously to make it ready to draw the image of the page on drum. The laser beam reflects back from a rotating mirror that actually scans it over the drum, laser doesn’t move itself. It removes the positive charge when a laser beam hits the drum, and it creates an area of negative charge.

Gradually, a black & white image appears on the entire page that builds up on the drum. The areas with positive charge remains white and the areas on the page get black which have negative charge. Drum of the photocopier got coated with tiny particles of powdered ink (toner) when it touches by the ink roller. Photoreceptor drum has a negative charge so the toner which has a positive charge sticks with the negative charged area of drum. Positively charged area of the drum doesn’t attract the inks.

On the other side of the printer A sheet of paper from a hopper is feed towards the drum. As it moves along, another corona wire gives strong positive charges to the paper. Positive charge of paper attracts the negatively charged toner particles, When the paper passes near the drum. The image is transferred from the drum onto the paper but, for the moment, the toner particles are just resting lightly on the paper's surface. Then it is passes through the heat, the ink permanently absorbed in fiber of the paper.

Laser printer Scanning Process

How laser printer prints / transfer the output on the paper?

Here’s the shortest possible explanation how a laser printer works. When you print something, the computer sends a huge amount of data or stream of electronic data to the laser printer. The data will then be passed on to an electronic circuit in the printer. The circuit’s main task or function is to decipher what the data means and what it needs to look like on the page.

The circuit will then send a laser beam scan back and forth across a drum inside the printer, creating a pattern of static electricity. This static electricity will then attract the toner, a kind of powdered ink, onto the page. Lastly, just like in a photocopier, a fuser unit bonds the toner to the paper and that’s when the printout appears.

The fuser unit is composed of two hot rollers where the inked paper passes through. The heat and pressure from the rollers fuse the toner particles permanently into the fibers of the paper. Because the fuser unit is hot, the paper is still warm when the printout emerges.