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How is static electric used in photocopiers?

Updated: 5/14/2022
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8y ago

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  1. A selenium coated drum is rubbed onto a brush. The selenium coated drum is positively charged.
  2. The light is shined onto the page that is to be copied. Being reflected through several mirrors, it is finally reflected onto the selenium coated drum.
  3. The selenium becomes conductive as the light hits it. The charges get rearranged until the charge is neutral. There is only positive charge on the parts of the drum where there was no light- the silhouette of the print on the page being photocopied.
  4. There is a brush that picks up negatively charged toner (a fine black powder) made of plastic beads and carbon particles. When the brush rolls onto the selenium, the negative toner is attracted to the positive charge left on the drum.
  5. Positively charged paper picks up the toner from underneath the selenium coated drum.
  6. The paper is finally heated to melt and seal the toner onto the paper.
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Americo Powlowski

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1y ago
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Q: How is static electric used in photocopiers?
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