A printing method invented in 1937 by the American patent lawyer Chester F. Carlson that functions in the following manner: a drum coated with a photo semiconductor is charged up and then partially discharged by a motif projected onto it. Dark areas retain their charge and toner applied to these areas remains in place. The image created in this way is then transferred to paper and fixed with heat. Originally designed for copiers, the technology is now also used for laser printers and digital printing systems.

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