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How does the photocopy machine work?
Photocopiers work on the principle that ‘opposites attract’. Toner is a powder that is used to create the printed text and images on paper. The powder is negatively charged, and so it is attracted to something positive – the paper. An image of the master copy is transferred onto the drum using a laser.
How does a corotron work?
The photoreceptor is shown below the corotron. A negative high voltage of a few thousand volts is applied to the wire. As the photoreceptor passes under the corotron, the uncharged areas acquire a charge which results in a uniformly negatively charged surface as the photoreceptor exits from under the corotron.
How do photocopiers work physics?
Negatively charged powder spread over the surface adheres through electrostatic attraction to the positively charged image areas. A piece of paper is placed over the powder image and then given a positive charge. The negatively charged powder is attracted to the paper as it is separated from the photoconductor.
Is a wire that is used to charge the photoconductive drum?
The corona wire uses static electricity to coat both the photoreceptive drum and the copy paper with a layer of positively charged ions. For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper.
How does toner acquire its charge?
As the developer is stirred and the particles rub up against each other, a triboelectric charge is generated between the them. The toner becomes negatively charged while the carrier becomes positive. The opposite charges cause the toner to be attracted to the carrier.
How does photocopier use electric charge?
For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper. These tasks are accomplished by the corona wires. These wires are subjected to a high voltage, which they subsequently transfer to the drum and paper in the form of static electricity.
How is a photoconductive surface exposed to an image?
First, a photoconductive surface is given a positive electrical charge. The photoconductive surface is then exposed to the image of a document. Because the illuminated sections (the non-image areas) become more conductive, the charge dissipates in the exposed areas.
How does the charge of a photocopier work?
How Photocopiers Work. Light reflected from blank areas on the page hits the drum and causes the charged particles coating the drum’s surface to be neutralized. This leaves positive charges only where there are dark areas on the paper that did not reflect light. These positive charges attract negatively charged toner.
How does a negatively charged powder adhere to a surface?
Negatively charged powder spread over the surface adheres through electrostatic attraction to the positively charged image areas. A piece of paper is placed over the powder image and then given a positive charge. The negatively charged powder is attracted to the paper as it is separated from the photoconductor.
How does a photoconductor make a copy of an image?
A piece of paper is placed over the powder image and then given a positive charge. The negatively charged powder is attracted to the paper as it is separated from the photoconductor. Finally, heat fuses the powder image to the paper, producing a copy of the original image.