What is the process of a photocopier?
Most modern photocopiers use a technology called xerography, a dry process that uses electrostatic charges on a light-sensitive photoreceptor to first attract and then transfer toner particles (a powder) onto paper in the form of an image. Photocopying is widely used in the business, education, and government sectors.
What is the main function of a photocopier?
A photocopier is an electronic machine that makes copies of images and documents. Photocopiers were once single-function devices.
What is the xerographic process?
xerography, Image-forming process that relies on a photoconductive substance whose electrical resistance decreases when light falls on it. Xerography is the basis of the most widely used document-copying machines (see photocopier). The process was invented in the 1930s by U.S. physicist Chester F.
How are electrostatics involved in photocopying?
How are electrostatics involved in photocopying? Negatively charged toner is attracted to positively charged areas on the paper. because the charges produced are all the same, the like charges in the hair repel each other and cause it to stand on end.
How does the photocopier use static electricity?
How does a photocopier use static electricity? To make a new copy, the paper that you are copying is placed downwards onto a sheet of glass. Using static electricity, an image of this paper is projected onto a positively charged drum. The coating on the drum can conduct electricity when light hits it.
What is an advantage of a photocopier?
A Photocopier machine has the capability to make duplicates of paper at a very fast rate. Mostly they are able to produce 100 pages per minute. Even at this speed, photocopiers are still affordable. Apart from photocopying, some photocopiers can also act as a scanner and a laser printer.
What are advantages of photocopiers?
Convenience & Flexibility Because many copiers double as networked printers and can scan or email documents, you may be able to reduce the number of devices your office needs by the number of functions your copier provides.
Why selenium is used in xerography?
Selenium is used because it is able to hold and conduct charges in the absence and presence of light. Once the photo-conductor is charged a document begins to pass over the rotating drum. In most printing devices a laser is used to illuminate the document which projects an image onto the drum.