Photocopiers

What is a Photocopier?

Invented in the late 1930's by Chester Carlson. Carlson called this invention electrophotography, what this meant was that a process was made that when printed or written materials are made into copies. Today photocopiers are used in just about every office around the World, and really what would we do without them?

Laws of Electrostatic Charge

1.) Opposite charges attract.
2.) Like charges repel.
3.) Neutral objects are attracted to charged objects.

Electrostatics in Photocopiers

How is an Electrostatic Charge Used in a Photocopier?

A photocopier uses a similar process to Static Electricity, and the reason why a photocopier works is because, it uses an electrostatic charge to produce a copy. The page you want to be copied, is put down onto the of glass found on the machine. An image of the page, is received onto a positively charged drum. This drum has a special coating that will conduct electricity when a light falls on to it. Some parts of the drum are lit by shown image, will lose their electrostatic charge when they begin to conduct. The toner found in the machine is negatively charged. This toner is attracted to the positively charged parts of the drum. Thus the theory of opposite charges attract. The drum will then rotate and roll against a piece of copier paper. The toner is then transferred from the drum to the paper, this is cause because the paper becomes charged with static electricity, and pulls the toner off of the drum, creating a photocopy of the original image. Lastly, the toner is heat sensitive so the loose electrons from the toner are then attached to the paper with the heat when they come off the drum. In other words the paper is then heated which allows the toner to stick to it.




How Photocopiers Work

Work Cited

Meeker-O'Connell, Ann. "How Photocopiers Work" 01 February 2001. HowStuffWorks.com. <http://home.howstuffworks.com/photocopier.htm> 20 February 2013.


Hays, Dan A. "How Does a Photocopier Work?." Scientific American. 2013 Scientific American, a Division of Nature America, Inc., 31 Mar. 2003. Web. 18 Feb. 2013. <http://www.scientificamerican.com/article.cfm?id=how-does-a-photocopier-wo>.


NA, NA. "Uses of Electrostatics." BBC. BBC, n.d. Web. 18 Feb. 2013. <http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/radiation/electrostaticsusesrev1.shtml>.


"How is Electrostatic Charge Used in Photocopiers." GCSE Science. N.P., n.d. Web. 17 Feb. 2013. <http://www.gcsescience.com/pse10-electrostatic-photocopier.htm>.


"Interesting Fats on Photocopiers." Go Articles. n.d. Web. 17 Feb. 2013. <http://goarticles.com/article/Interesting-facts-on-Photocopiers-and-Fax-s/2638842/>.


"The Electrostatics Theory." iitphysics. n.p., Web. 17 Feb. 2013. <http://iitphysics.org/electrostatics_theory.htm>.