A type of imaging system, commonly used in photocopiers, laser printers, etc., that utilizes an inorganic photoconductor—such as zinc oxide in electrofax, or selenium in xerography—applied to the surface of a drum. A corona sensitizes the drum to light using an electrostatic charge. Light reflected by non-image areas of the original image dissipates the charge from the non-image portions of the drum, the charge remaining in the image portions. A dry or liquid toner, which is oppositely charged, is attracted to the charged (image) portions of the drum and adheres to it, transferring to paper (or other substrate) passing beneath the drum.
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