Photocopiers – How does it work?

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Have you ever wondered how a photocopier works? Some use the technique called Xerography. This is a Greek word that means “Dry Writing”. The process of Xerography uses electrostatic charges along with heat. This method is very versatile and is used to get copies of all types of written, graphic and printed matter. Xerography makes use of an aluminium drum that is coated with an element called selenium. When light is passed through or reflected off, the matter that needs to be copied, it reaches the selenium surface where the ink that contains the negatively charged particles are coated. This forms an image of that material that is there on the drum.

When a paper that has postive charge on it is passed nearer to the drum, the paper attracts the image that has been formed on the drum by the negative particles earlier.

There is also another mechanism called Thermography which uses infra-red light. The matter to be copied is placed together along with the paper on which it is to be copied. Infra red light is passed through both the papers together. The image from the matter to be copied is transfered to the plain paper.

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